vendor: pull in support for USB devices via libusb/gousb

vendor.conf

@@ -13,6 +13,7 @@ github.com/golang/snappy	d9eb7a3
 github.com/hashicorp/golang-lru	0a025b7
 github.com/huin/goupnp	679507a
 github.com/jackpal/go-nat-pmp	v1.0.1-4-g1fa385a
+github.com/karalabe/gousb	ffa821b
 github.com/maruel/panicparse	ad66119
 github.com/mattn/go-colorable	v0.0.6-9-gd228849
 github.com/mattn/go-isatty	30a891c

vendor/github.com/karalabe/gousb/.gitignore

@@ -0,0 +1 @@
+*.sw[op]

vendor/github.com/karalabe/gousb/.travis.yml

@@ -0,0 +1,12 @@
+language: go
+
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      go: 1.7.4
+    - os: osx
+      go: 1.7.4
+
+script:
+  - go test -v -test.run='BCD|Parse' ./...

vendor/github.com/karalabe/gousb/LICENSE

@@ -0,0 +1,202 @@
+
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vendor/github.com/karalabe/gousb/README.md

@@ -0,0 +1,47 @@
+Introduction
+============
+
+[![Travis Build Status][travisimg]][travis]
+[![AppVeyor Build Status][appveyorimg]][appveyor]
+[![GoDoc][docimg]][doc]
+
+The gousb package is an attempt at wrapping the `libusb` library into a Go-like binding in a fully self-contained, go-gettable package. Supported platforms include Linux, macOS and Windows as well as the mobile platforms Android and iOS.
+
+This package is a fork of [`github.com/kylelemons/gousb`](https://github.com/kylelemons/gousb), which at the moment seems to be unmaintained. The current fork is different from the upstream package as it contains code to embed `libusb` directly into the Go package (thus becoming fully self-cotnained and go-gettable), as well as it features a few contributions and bugfixes that never really got addressed in the upstream package, but which address important issues nonetheless.
+
+*Note, if @kylelemons decides to pick development of the upstream project up again, consider all commits made by me to this repo as ready contributions. I cannot vouch for other commits as the upstream repo needs a signed CLA for Google.*
+
+[travisimg]:   https://travis-ci.org/karalabe/gousb.svg?branch=master
+[travis]:      https://travis-ci.org/karalabe/gousb
+[appveyorimg]: https://ci.appveyor.com/api/projects/status/84k9xse10rl72gn2/branch/master?svg=true
+[appveyor]:    https://ci.appveyor.com/project/karalabe/gousb
+[docimg]:      https://godoc.org/github.com/karalabe/gousb?status.svg
+[doc]:         https://godoc.org/github.com/karalabe/gousb
+
+Installation
+============
+
+Example: lsusb
+--------------
+The gousb project provides a simple but useful example: lsusb.  This binary will list the USB devices connected to your system and various interesting tidbits about them, their configurations, endpoints, etc.  To install it, run the following command:
+
+    go get -v github.com/karalabe/gousb/lsusb
+
+gousb
+-----
+If you installed the lsusb example, both libraries below are already installed.
+
+Installing the primary gousb package is really easy:
+
+    go get -v github.com/karalabe/gousb/usb
+
+There is also a `usbid` package that will not be installed by default by this command, but which provides useful information including the human-readable vendor and product codes for detected hardware.  It's not installed by default and not linked into the `usb` package by default because it adds ~400kb to the resulting binary.  If you want both, they can be installed thus:
+
+    go get -v github.com/karalabe/gousb/usb{,id}
+
+Documentation
+=============
+The documentation can be viewed via local godoc or via the excellent [godoc.org](http://godoc.org/):
+
+- [usb](http://godoc.org/github.com/karalabe/gousb/usb)
+- [usbid](http://godoc.org/pkg/github.com/karalabe/gousb/usbid)

vendor/github.com/karalabe/gousb/appveyor.yml

@@ -0,0 +1,34 @@
+os: Visual Studio 2015
+
+# Clone directly into GOPATH.
+clone_folder: C:\gopath\src\github.com\karalabe\gousb
+clone_depth: 5
+version: "{branch}.{build}"
+environment:
+  global:
+    GOPATH: C:\gopath
+    CC: gcc.exe
+  matrix:
+    - GOARCH: amd64
+      MSYS2_ARCH: x86_64
+      MSYS2_BITS: 64
+      MSYSTEM: MINGW64
+      PATH: C:\msys64\mingw64\bin\;%PATH%
+    - GOARCH: 386
+      MSYS2_ARCH: i686
+      MSYS2_BITS: 32
+      MSYSTEM: MINGW32
+      PATH: C:\msys64\mingw32\bin\;%PATH%
+
+install:
+  - rmdir C:\go /s /q
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.7.4.windows-%GOARCH%.zip
+  - 7z x go1.7.4.windows-%GOARCH%.zip -y -oC:\ > NUL
+  - go version
+  - gcc --version
+
+build_script:
+  - go install ./...
+
+test_script:
+  - go test -v -test.run="BCD|Parse" ./...

vendor/github.com/karalabe/gousb/internal/libusb/AUTHORS

@@ -0,0 +1,89 @@
+Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
+Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
+Copyright © 2010-2012 Peter Stuge <peter@stuge.se>
+Copyright © 2008-2016 Nathan Hjelm <hjelmn@users.sourceforge.net>
+Copyright © 2009-2013 Pete Batard <pete@akeo.ie>
+Copyright © 2009-2013 Ludovic Rousseau <ludovic.rousseau@gmail.com>
+Copyright © 2010-2012 Michael Plante <michael.plante@gmail.com>
+Copyright © 2011-2013 Hans de Goede <hdegoede@redhat.com>
+Copyright © 2012-2013 Martin Pieuchot <mpi@openbsd.org>
+Copyright © 2012-2013 Toby Gray <toby.gray@realvnc.com>
+Copyright © 2013-2015 Chris Dickens <christopher.a.dickens@gmail.com>
+
+Other contributors:
+Akshay Jaggi
+Alan Ott
+Alan Stern
+Alex Vatchenko
+Andrew Fernandes
+Anthony Clay
+Antonio Ospite
+Artem Egorkine
+Aurelien Jarno
+Bastien Nocera
+Bei Zhang
+Benjamin Dobell
+Carl Karsten
+Colin Walters
+Dave Camarillo
+David Engraf
+David Moore
+Davidlohr Bueso
+Federico Manzan
+Felipe Balbi
+Florian Albrechtskirchinger
+Francesco Montorsi
+Francisco Facioni
+Gaurav Gupta
+Graeme Gill
+Gustavo Zacarias
+Hans Ulrich Niedermann
+Hector Martin
+Hoi-Ho Chan
+Ilya Konstantinov
+James Hanko
+John Sheu
+Joshua Blake
+Justin Bischoff
+Karsten Koenig
+Konrad Rzepecki
+Kuangye Guo
+Lars Kanis
+Lars Wirzenius
+Luca Longinotti
+Marcus Meissner
+Markus Heidelberg
+Martin Ettl
+Martin Koegler
+Matthias Bolte
+Mike Frysinger
+Mikhail Gusarov
+Moritz Fischer
+Ларионов Даниил
+Nicholas Corgan
+Omri Iluz
+Orin Eman
+Paul Fertser
+Pekka Nikander
+Rob Walker
+Sean McBride
+Sebastian Pipping
+Simon Haggett
+Simon Newton
+Thomas Röfer
+Tim Hutt
+Tim Roberts
+Tobias Klauser
+Toby Peterson
+Tormod Volden
+Trygve Laugstøl
+Uri Lublin
+Vasily Khoruzhick
+Vegard Storheil Eriksen
+Venkatesh Shukla
+Vitali Lovich
+Xiaofan Chen
+Zoltán Kovács
+Роман Донченко
+parafin
+xantares

vendor/github.com/karalabe/gousb/internal/libusb/COPYING

@@ -0,0 +1,504 @@
+		  GNU LESSER GENERAL PUBLIC LICENSE
+		       Version 2.1, February 1999
+
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+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+ the version number 2.1.]
+
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+specially designated software packages--typically libraries--of the
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+can use it too, but we suggest you first think carefully about whether
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+

vendor/github.com/karalabe/gousb/internal/libusb/libusb/config.h

@@ -0,0 +1,3 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/hotplug.c

@@ -0,0 +1,350 @@
+/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
+/*
+ * Hotplug functions for libusb
+ * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
+ * Copyright © 2012-2013 Peter Stuge <peter@stuge.se>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#include <assert.h>
+
+#include "libusbi.h"
+#include "hotplug.h"
+
+/**
+ * @defgroup libusb_hotplug Device hotplug event notification
+ * This page details how to use the libusb hotplug interface, where available.
+ *
+ * Be mindful that not all platforms currently implement hotplug notification and
+ * that you should first call on \ref libusb_has_capability() with parameter
+ * \ref LIBUSB_CAP_HAS_HOTPLUG to confirm that hotplug support is available.
+ *
+ * \page libusb_hotplug Device hotplug event notification
+ *
+ * \section hotplug_intro Introduction
+ *
+ * Version 1.0.16, \ref LIBUSB_API_VERSION >= 0x01000102, has added support
+ * for hotplug events on <b>some</b> platforms (you should test if your platform
+ * supports hotplug notification by calling \ref libusb_has_capability() with
+ * parameter \ref LIBUSB_CAP_HAS_HOTPLUG). 
+ *
+ * This interface allows you to request notification for the arrival and departure
+ * of matching USB devices.
+ *
+ * To receive hotplug notification you register a callback by calling
+ * \ref libusb_hotplug_register_callback(). This function will optionally return
+ * a callback handle that can be passed to \ref libusb_hotplug_deregister_callback().
+ *
+ * A callback function must return an int (0 or 1) indicating whether the callback is
+ * expecting additional events. Returning 0 will rearm the callback and 1 will cause
+ * the callback to be deregistered. Note that when callbacks are called from
+ * libusb_hotplug_register_callback() because of the \ref LIBUSB_HOTPLUG_ENUMERATE
+ * flag, the callback return value is ignored, iow you cannot cause a callback
+ * to be deregistered by returning 1 when it is called from
+ * libusb_hotplug_register_callback().
+ *
+ * Callbacks for a particular context are automatically deregistered by libusb_exit().
+ *
+ * As of 1.0.16 there are two supported hotplug events:
+ *  - LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED: A device has arrived and is ready to use
+ *  - LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT: A device has left and is no longer available
+ *
+ * A hotplug event can listen for either or both of these events.
+ *
+ * Note: If you receive notification that a device has left and you have any
+ * a libusb_device_handles for the device it is up to you to call libusb_close()
+ * on each device handle to free up any remaining resources associated with the device.
+ * Once a device has left any libusb_device_handle associated with the device
+ * are invalid and will remain so even if the device comes back.
+ *
+ * When handling a LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED event it is considered
+ * safe to call any libusb function that takes a libusb_device. It also safe to
+ * open a device and submit asynchronous transfers. However, most other functions
+ * that take a libusb_device_handle are <b>not</b> safe to call. Examples of such
+ * functions are any of the \ref libusb_syncio "synchronous API" functions or the blocking
+ * functions that retrieve various \ref libusb_desc "USB descriptors". These functions must
+ * be used outside of the context of the hotplug callback.
+ *
+ * When handling a LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT event the only safe function
+ * is libusb_get_device_descriptor().
+ *
+ * The following code provides an example of the usage of the hotplug interface:
+\code
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <libusb.h>
+
+static int count = 0;
+
+int hotplug_callback(struct libusb_context *ctx, struct libusb_device *dev,
+                     libusb_hotplug_event event, void *user_data) {
+  static libusb_device_handle *dev_handle = NULL;
+  struct libusb_device_descriptor desc;
+  int rc;
+
+  (void)libusb_get_device_descriptor(dev, &desc);
+
+  if (LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED == event) {
+    rc = libusb_open(dev, &dev_handle);
+    if (LIBUSB_SUCCESS != rc) {
+      printf("Could not open USB device\n");
+    }
+  } else if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
+    if (dev_handle) {
+      libusb_close(dev_handle);
+      dev_handle = NULL;
+    }
+  } else {
+    printf("Unhandled event %d\n", event);
+  }
+  count++;
+
+  return 0;
+}
+
+int main (void) {
+  libusb_hotplug_callback_handle callback_handle;
+  int rc;
+
+  libusb_init(NULL);
+
+  rc = libusb_hotplug_register_callback(NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED |
+                                        LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, 0x045a, 0x5005,
+                                        LIBUSB_HOTPLUG_MATCH_ANY, hotplug_callback, NULL,
+                                        &callback_handle);
+  if (LIBUSB_SUCCESS != rc) {
+    printf("Error creating a hotplug callback\n");
+    libusb_exit(NULL);
+    return EXIT_FAILURE;
+  }
+
+  while (count < 2) {
+    libusb_handle_events_completed(NULL, NULL);
+    nanosleep(&(struct timespec){0, 10000000UL}, NULL);
+  }
+
+  libusb_hotplug_deregister_callback(NULL, callback_handle);
+  libusb_exit(NULL);
+
+  return 0;
+}
+\endcode
+ */
+
+static int usbi_hotplug_match_cb (struct libusb_context *ctx,
+	struct libusb_device *dev, libusb_hotplug_event event,
+	struct libusb_hotplug_callback *hotplug_cb)
+{
+	/* Handle lazy deregistration of callback */
+	if (hotplug_cb->needs_free) {
+		/* Free callback */
+		return 1;
+	}
+
+	if (!(hotplug_cb->events & event)) {
+		return 0;
+	}
+
+	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->vendor_id &&
+	    hotplug_cb->vendor_id != dev->device_descriptor.idVendor) {
+		return 0;
+	}
+
+	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->product_id &&
+	    hotplug_cb->product_id != dev->device_descriptor.idProduct) {
+		return 0;
+	}
+
+	if (LIBUSB_HOTPLUG_MATCH_ANY != hotplug_cb->dev_class &&
+	    hotplug_cb->dev_class != dev->device_descriptor.bDeviceClass) {
+		return 0;
+	}
+
+	return hotplug_cb->cb (ctx, dev, event, hotplug_cb->user_data);
+}
+
+void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev,
+	libusb_hotplug_event event)
+{
+	struct libusb_hotplug_callback *hotplug_cb, *next;
+	int ret;
+
+	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
+
+	list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list, struct libusb_hotplug_callback) {
+		usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
+		ret = usbi_hotplug_match_cb (ctx, dev, event, hotplug_cb);
+		usbi_mutex_lock(&ctx->hotplug_cbs_lock);
+
+		if (ret) {
+			list_del(&hotplug_cb->list);
+			free(hotplug_cb);
+		}
+	}
+
+	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
+
+	/* the backend is expected to call the callback for each active transfer */
+}
+
+void usbi_hotplug_notification(struct libusb_context *ctx, struct libusb_device *dev,
+	libusb_hotplug_event event)
+{
+	int pending_events;
+	libusb_hotplug_message *message = calloc(1, sizeof(*message));
+
+	if (!message) {
+		usbi_err(ctx, "error allocating hotplug message");
+		return;
+	}
+
+	message->event = event;
+	message->device = dev;
+
+	/* Take the event data lock and add this message to the list.
+	 * Only signal an event if there are no prior pending events. */
+	usbi_mutex_lock(&ctx->event_data_lock);
+	pending_events = usbi_pending_events(ctx);
+	list_add_tail(&message->list, &ctx->hotplug_msgs);
+	if (!pending_events)
+		usbi_signal_event(ctx);
+	usbi_mutex_unlock(&ctx->event_data_lock);
+}
+
+int API_EXPORTED libusb_hotplug_register_callback(libusb_context *ctx,
+	libusb_hotplug_event events, libusb_hotplug_flag flags,
+	int vendor_id, int product_id, int dev_class,
+	libusb_hotplug_callback_fn cb_fn, void *user_data,
+	libusb_hotplug_callback_handle *callback_handle)
+{
+	libusb_hotplug_callback *new_callback;
+	static int handle_id = 1;
+
+	/* check for hotplug support */
+	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	}
+
+	/* check for sane values */
+	if ((LIBUSB_HOTPLUG_MATCH_ANY != vendor_id && (~0xffff & vendor_id)) ||
+	    (LIBUSB_HOTPLUG_MATCH_ANY != product_id && (~0xffff & product_id)) ||
+	    (LIBUSB_HOTPLUG_MATCH_ANY != dev_class && (~0xff & dev_class)) ||
+	    !cb_fn) {
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+
+	USBI_GET_CONTEXT(ctx);
+
+	new_callback = (libusb_hotplug_callback *)calloc(1, sizeof (*new_callback));
+	if (!new_callback) {
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	new_callback->ctx = ctx;
+	new_callback->vendor_id = vendor_id;
+	new_callback->product_id = product_id;
+	new_callback->dev_class = dev_class;
+	new_callback->flags = flags;
+	new_callback->events = events;
+	new_callback->cb = cb_fn;
+	new_callback->user_data = user_data;
+	new_callback->needs_free = 0;
+
+	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
+
+	/* protect the handle by the context hotplug lock. it doesn't matter if the same handle
+	 * is used for different contexts only that the handle is unique for this context */
+	new_callback->handle = handle_id++;
+
+	list_add(&new_callback->list, &ctx->hotplug_cbs);
+
+	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
+
+
+	if (flags & LIBUSB_HOTPLUG_ENUMERATE) {
+		int i, len;
+		struct libusb_device **devs;
+
+		len = (int) libusb_get_device_list(ctx, &devs);
+		if (len < 0) {
+			libusb_hotplug_deregister_callback(ctx,
+							new_callback->handle);
+			return len;
+		}
+
+		for (i = 0; i < len; i++) {
+			usbi_hotplug_match_cb(ctx, devs[i],
+					LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED,
+					new_callback);
+		}
+
+		libusb_free_device_list(devs, 1);
+	}
+
+
+	if (callback_handle)
+		*callback_handle = new_callback->handle;
+
+	return LIBUSB_SUCCESS;
+}
+
+void API_EXPORTED libusb_hotplug_deregister_callback (struct libusb_context *ctx,
+	libusb_hotplug_callback_handle callback_handle)
+{
+	struct libusb_hotplug_callback *hotplug_cb;
+
+	/* check for hotplug support */
+	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
+		return;
+	}
+
+	USBI_GET_CONTEXT(ctx);
+
+	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
+	list_for_each_entry(hotplug_cb, &ctx->hotplug_cbs, list,
+			    struct libusb_hotplug_callback) {
+		if (callback_handle == hotplug_cb->handle) {
+			/* Mark this callback for deregistration */
+			hotplug_cb->needs_free = 1;
+		}
+	}
+	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
+
+	usbi_hotplug_notification(ctx, NULL, 0);
+}
+
+void usbi_hotplug_deregister_all(struct libusb_context *ctx) {
+	struct libusb_hotplug_callback *hotplug_cb, *next;
+
+	usbi_mutex_lock(&ctx->hotplug_cbs_lock);
+	list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list,
+				 struct libusb_hotplug_callback) {
+		list_del(&hotplug_cb->list);
+		free(hotplug_cb);
+	}
+
+	usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/hotplug.h

@@ -0,0 +1,90 @@
+/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
+/*
+ * Hotplug support for libusb
+ * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
+ * Copyright © 2012-2013 Peter Stuge <peter@stuge.se>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if !defined(USBI_HOTPLUG_H)
+#define USBI_HOTPLUG_H
+
+#ifndef LIBUSBI_H
+#include "libusbi.h"
+#endif
+
+/** \ingroup hotplug
+ * The hotplug callback structure. The user populates this structure with
+ * libusb_hotplug_prepare_callback() and then calls libusb_hotplug_register_callback()
+ * to receive notification of hotplug events.
+ */
+struct libusb_hotplug_callback {
+	/** Context this callback is associated with */
+	struct libusb_context *ctx;
+
+	/** Vendor ID to match or LIBUSB_HOTPLUG_MATCH_ANY */
+	int vendor_id;
+
+	/** Product ID to match or LIBUSB_HOTPLUG_MATCH_ANY */
+	int product_id;
+
+	/** Device class to match or LIBUSB_HOTPLUG_MATCH_ANY */
+	int dev_class;
+
+	/** Hotplug callback flags */
+	libusb_hotplug_flag flags;
+
+	/** Event(s) that will trigger this callback */
+	libusb_hotplug_event events;
+
+	/** Callback function to invoke for matching event/device */
+	libusb_hotplug_callback_fn cb;
+
+	/** Handle for this callback (used to match on deregister) */
+	libusb_hotplug_callback_handle handle;
+
+	/** User data that will be passed to the callback function */
+	void *user_data;
+
+	/** Callback is marked for deletion */
+	int needs_free;
+
+	/** List this callback is registered in (ctx->hotplug_cbs) */
+	struct list_head list;
+};
+
+typedef struct libusb_hotplug_callback libusb_hotplug_callback;
+
+struct libusb_hotplug_message {
+	/** The hotplug event that occurred */
+	libusb_hotplug_event event;
+
+	/** The device for which this hotplug event occurred */
+	struct libusb_device *device;
+
+	/** List this message is contained in (ctx->hotplug_msgs) */
+	struct list_head list;
+};
+
+typedef struct libusb_hotplug_message libusb_hotplug_message;
+
+void usbi_hotplug_deregister_all(struct libusb_context *ctx);
+void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev,
+			libusb_hotplug_event event);
+void usbi_hotplug_notification(struct libusb_context *ctx, struct libusb_device *dev,
+			libusb_hotplug_event event);
+
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/darwin_usb.h

@@ -0,0 +1,164 @@
+/*
+ * darwin backend for libusb 1.0
+ * Copyright © 2008-2015 Nathan Hjelm <hjelmn@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if !defined(LIBUSB_DARWIN_H)
+#define LIBUSB_DARWIN_H
+
+#include "libusbi.h"
+
+#include <IOKit/IOTypes.h>
+#include <IOKit/IOCFBundle.h>
+#include <IOKit/usb/IOUSBLib.h>
+#include <IOKit/IOCFPlugIn.h>
+
+/* IOUSBInterfaceInferface */
+#if defined (kIOUSBInterfaceInterfaceID700) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_9
+
+#define usb_interface_t IOUSBInterfaceInterface700
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID700
+#define InterfaceVersion 700
+
+#elif defined (kIOUSBInterfaceInterfaceID550) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_9
+
+#define usb_interface_t IOUSBInterfaceInterface550
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID550
+#define InterfaceVersion 550
+
+#elif defined (kIOUSBInterfaceInterfaceID500)
+
+#define usb_interface_t IOUSBInterfaceInterface500
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID500
+#define InterfaceVersion 500
+
+#elif defined (kIOUSBInterfaceInterfaceID300)
+
+#define usb_interface_t IOUSBInterfaceInterface300
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID300
+#define InterfaceVersion 300
+
+#elif defined (kIOUSBInterfaceInterfaceID245)
+
+#define usb_interface_t IOUSBInterfaceInterface245
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID245
+#define InterfaceVersion 245
+
+#elif defined (kIOUSBInterfaceInterfaceID220)
+
+#define usb_interface_t IOUSBInterfaceInterface220
+#define InterfaceInterfaceID kIOUSBInterfaceInterfaceID220
+#define InterfaceVersion 220
+
+#else
+
+#error "IOUSBFamily is too old. Please upgrade your OS"
+
+#endif
+
+/* IOUSBDeviceInterface */
+#if defined (kIOUSBDeviceInterfaceID500) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_9
+
+#define usb_device_t    IOUSBDeviceInterface500
+#define DeviceInterfaceID kIOUSBDeviceInterfaceID500
+#define DeviceVersion 500
+
+#elif defined (kIOUSBDeviceInterfaceID320)
+
+#define usb_device_t    IOUSBDeviceInterface320
+#define DeviceInterfaceID kIOUSBDeviceInterfaceID320
+#define DeviceVersion 320
+
+#elif defined (kIOUSBDeviceInterfaceID300)
+
+#define usb_device_t    IOUSBDeviceInterface300
+#define DeviceInterfaceID kIOUSBDeviceInterfaceID300
+#define DeviceVersion 300
+
+#elif defined (kIOUSBDeviceInterfaceID245)
+
+#define usb_device_t    IOUSBDeviceInterface245
+#define DeviceInterfaceID kIOUSBDeviceInterfaceID245
+#define DeviceVersion 245
+
+#elif defined (kIOUSBDeviceInterfaceID220)
+#define usb_device_t    IOUSBDeviceInterface197
+#define DeviceInterfaceID kIOUSBDeviceInterfaceID197
+#define DeviceVersion 197
+
+#else
+
+#error "IOUSBFamily is too old. Please upgrade your OS"
+
+#endif
+
+#if !defined(IO_OBJECT_NULL)
+#define IO_OBJECT_NULL ((io_object_t) 0)
+#endif
+
+typedef IOCFPlugInInterface *io_cf_plugin_ref_t;
+typedef IONotificationPortRef io_notification_port_t;
+
+/* private structures */
+struct darwin_cached_device {
+  struct list_head      list;
+  IOUSBDeviceDescriptor dev_descriptor;
+  UInt32                location;
+  UInt64                parent_session;
+  UInt64                session;
+  UInt16                address;
+  char                  sys_path[21];
+  usb_device_t        **device;
+  int                   open_count;
+  UInt8                 first_config, active_config, port;  
+  int                   can_enumerate;
+  int                   refcount;
+};
+
+struct darwin_device_priv {
+  struct darwin_cached_device *dev;
+};
+
+struct darwin_device_handle_priv {
+  int                  is_open;
+  CFRunLoopSourceRef   cfSource;
+
+  struct darwin_interface {
+    usb_interface_t    **interface;
+    uint8_t              num_endpoints;
+    CFRunLoopSourceRef   cfSource;
+    uint64_t             frames[256];
+    uint8_t              endpoint_addrs[USB_MAXENDPOINTS];
+  } interfaces[USB_MAXINTERFACES];
+};
+
+struct darwin_transfer_priv {
+  /* Isoc */
+  IOUSBIsocFrame *isoc_framelist;
+  int num_iso_packets;
+
+  /* Control */
+  IOUSBDevRequestTO req;
+
+  /* Bulk */
+
+  /* Completion status */
+  IOReturn result;
+  UInt32 size;
+};
+
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/haiku_pollfs.cpp

@@ -0,0 +1,367 @@
+/*
+ * Copyright 2007-2008, Haiku Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Michael Lotz <mmlr@mlotz.ch>
+ */
+
+#include "haiku_usb.h"
+#include <cstdio>
+#include <Directory.h>
+#include <Entry.h>
+#include <Looper.h>
+#include <Messenger.h>
+#include <Node.h>
+#include <NodeMonitor.h>
+#include <Path.h>
+#include <cstring>
+
+class WatchedEntry {
+public:
+			WatchedEntry(BMessenger *, entry_ref *);
+			~WatchedEntry();
+	bool		EntryCreated(entry_ref *ref);
+	bool		EntryRemoved(ino_t node);
+	bool		InitCheck();
+
+private:
+	BMessenger*	fMessenger;
+	node_ref	fNode;
+	bool		fIsDirectory;
+	USBDevice*	fDevice;
+	WatchedEntry*	fEntries;
+	WatchedEntry*	fLink;
+	bool		fInitCheck;
+};
+
+
+class RosterLooper : public BLooper {
+public:
+			RosterLooper(USBRoster *);
+	void		Stop();
+	virtual void	MessageReceived(BMessage *);
+	bool		InitCheck();
+
+private:
+	USBRoster*	fRoster;
+	WatchedEntry*	fRoot;
+	BMessenger*	fMessenger;
+	bool		fInitCheck;
+};
+
+
+WatchedEntry::WatchedEntry(BMessenger *messenger, entry_ref *ref)
+	:	fMessenger(messenger),
+		fIsDirectory(false),
+		fDevice(NULL),
+		fEntries(NULL),
+		fLink(NULL),
+		fInitCheck(false)
+{
+	BEntry entry(ref);
+	entry.GetNodeRef(&fNode);
+
+	BDirectory directory;
+	if (entry.IsDirectory() && directory.SetTo(ref) >= B_OK) {
+		fIsDirectory = true;
+
+		while (directory.GetNextEntry(&entry) >= B_OK) {
+			if (entry.GetRef(ref) < B_OK)
+				continue;
+
+			WatchedEntry *child = new(std::nothrow) WatchedEntry(fMessenger, ref);
+			if (child == NULL)
+				continue;
+			if (child->InitCheck() == false) {
+				delete child;
+				continue;
+			}
+
+			child->fLink = fEntries;
+			fEntries = child;
+		}
+
+		watch_node(&fNode, B_WATCH_DIRECTORY, *fMessenger);
+	}
+	else {
+		if (strncmp(ref->name, "raw", 3) == 0)
+			return;
+
+		BPath path, parent_path;
+		entry.GetPath(&path);
+		fDevice = new(std::nothrow) USBDevice(path.Path());
+		if (fDevice != NULL && fDevice->InitCheck() == true) {
+			// Add this new device to each active context's device list
+			struct libusb_context *ctx;
+			unsigned long session_id = (unsigned long)&fDevice;
+
+			usbi_mutex_lock(&active_contexts_lock);
+			list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
+				struct libusb_device *dev = usbi_get_device_by_session_id(ctx, session_id);
+				if (dev) {
+					usbi_dbg("using previously allocated device with location %lu", session_id);
+					libusb_unref_device(dev);
+					continue;
+				}
+				usbi_dbg("allocating new device with location %lu", session_id);
+				dev = usbi_alloc_device(ctx, session_id);
+				if (!dev) {
+					usbi_dbg("device allocation failed");
+					continue;
+				}
+				*((USBDevice **)dev->os_priv) = fDevice;
+
+				// Calculate pseudo-device-address
+				int addr, tmp;
+				if (strcmp(path.Leaf(), "hub") == 0)
+					tmp = 100;	//Random Number
+				else
+					sscanf(path.Leaf(), "%d", &tmp);
+				addr = tmp + 1;
+				path.GetParent(&parent_path);
+				while (strcmp(parent_path.Leaf(), "usb") != 0) {
+					sscanf(parent_path.Leaf(), "%d", &tmp);
+					addr += tmp + 1;
+					parent_path.GetParent(&parent_path);
+				}
+				sscanf(path.Path(), "/dev/bus/usb/%d", &dev->bus_number);
+				dev->device_address = addr - (dev->bus_number + 1);
+
+				if (usbi_sanitize_device(dev) < 0) {
+					usbi_dbg("device sanitization failed");
+					libusb_unref_device(dev);
+					continue;
+				}
+				usbi_connect_device(dev);
+			}
+			usbi_mutex_unlock(&active_contexts_lock);
+		}
+		else if (fDevice) {
+			delete fDevice;
+			fDevice = NULL;
+			return;
+		}
+	}
+	fInitCheck = true;
+}
+
+
+WatchedEntry::~WatchedEntry()
+{
+	if (fIsDirectory) {
+		watch_node(&fNode, B_STOP_WATCHING, *fMessenger);
+
+		WatchedEntry *child = fEntries;
+		while (child) {
+			WatchedEntry *next = child->fLink;
+			delete child;
+			child = next;
+		}
+	}
+
+	if (fDevice) {
+		// Remove this device from each active context's device list
+		struct libusb_context *ctx;
+		struct libusb_device *dev;
+		unsigned long session_id = (unsigned long)&fDevice;
+
+		usbi_mutex_lock(&active_contexts_lock);
+		list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
+			dev = usbi_get_device_by_session_id(ctx, session_id);
+			if (dev != NULL) {
+				usbi_disconnect_device(dev);
+				libusb_unref_device(dev);
+			} else {
+				usbi_dbg("device with location %lu not found", session_id);
+			}
+		}
+		usbi_mutex_static_unlock(&active_contexts_lock);
+		delete fDevice;
+	}
+}
+
+
+bool
+WatchedEntry::EntryCreated(entry_ref *ref)
+{
+	if (!fIsDirectory)
+		return false;
+
+	if (ref->directory != fNode.node) {
+		WatchedEntry *child = fEntries;
+		while (child) {
+			if (child->EntryCreated(ref))
+				return true;
+			child = child->fLink;
+		}
+		return false;
+	}
+
+	WatchedEntry *child = new(std::nothrow) WatchedEntry(fMessenger, ref);
+	if (child == NULL)
+		return false;
+	child->fLink = fEntries;
+	fEntries = child;
+	return true;
+}
+
+
+bool
+WatchedEntry::EntryRemoved(ino_t node)
+{
+	if (!fIsDirectory)
+		return false;
+
+	WatchedEntry *child = fEntries;
+	WatchedEntry *lastChild = NULL;
+	while (child) {
+		if (child->fNode.node == node) {
+			if (lastChild)
+				lastChild->fLink = child->fLink;
+			else
+				fEntries = child->fLink;
+			delete child;
+			return true;
+		}
+
+		if (child->EntryRemoved(node))
+			return true;
+
+		lastChild = child;
+		child = child->fLink;
+	}
+	return false;
+}
+
+
+bool
+WatchedEntry::InitCheck()
+{
+	return fInitCheck;
+}
+
+
+RosterLooper::RosterLooper(USBRoster *roster)
+	:	BLooper("LibusbRoster Looper"),
+		fRoster(roster),
+		fRoot(NULL),
+		fMessenger(NULL),
+		fInitCheck(false)
+{
+	BEntry entry("/dev/bus/usb");
+	if (!entry.Exists()) {
+		usbi_err(NULL, "usb_raw not published");
+		return;
+	}
+
+	Run();
+	fMessenger = new(std::nothrow) BMessenger(this);
+	if (fMessenger == NULL) {
+		usbi_err(NULL, "error creating BMessenger object");
+		return;
+	}
+
+	if (Lock()) {
+		entry_ref ref;
+		entry.GetRef(&ref);
+		fRoot = new(std::nothrow) WatchedEntry(fMessenger, &ref);
+		Unlock();
+		if (fRoot == NULL)
+			return;
+		if (fRoot->InitCheck() == false) {
+			delete fRoot;
+			fRoot = NULL;
+			return;
+		}
+	}
+	fInitCheck = true;
+}
+
+
+void
+RosterLooper::Stop()
+{
+	Lock();
+	delete fRoot;
+	delete fMessenger;
+	Quit();
+}
+
+
+void
+RosterLooper::MessageReceived(BMessage *message)
+{
+	int32 opcode;
+	if (message->FindInt32("opcode", &opcode) < B_OK)
+		return;
+
+	switch (opcode) {
+		case B_ENTRY_CREATED:
+		{
+			dev_t device;
+			ino_t directory;
+			const char *name;
+			if (message->FindInt32("device", &device) < B_OK ||
+				message->FindInt64("directory", &directory) < B_OK ||
+				message->FindString("name", &name) < B_OK)
+				break;
+
+			entry_ref ref(device, directory, name);
+			fRoot->EntryCreated(&ref);
+			break;
+		}
+		case B_ENTRY_REMOVED:
+		{
+			ino_t node;
+			if (message->FindInt64("node", &node) < B_OK)
+				break;
+			fRoot->EntryRemoved(node);
+			break;
+		}
+	}
+}
+
+
+bool
+RosterLooper::InitCheck()
+{
+	return fInitCheck;
+}
+
+
+USBRoster::USBRoster()
+	:	fLooper(NULL)
+{
+}
+
+
+USBRoster::~USBRoster()
+{
+	Stop();
+}
+
+
+int
+USBRoster::Start()
+{
+	if (fLooper == NULL) {
+		fLooper = new(std::nothrow) RosterLooper(this);
+		if (fLooper == NULL || ((RosterLooper *)fLooper)->InitCheck() == false) {
+			if (fLooper)
+				fLooper = NULL;
+			return LIBUSB_ERROR_OTHER;
+		}
+	}
+	return LIBUSB_SUCCESS;
+}
+
+
+void
+USBRoster::Stop()
+{
+	if (fLooper) {
+		((RosterLooper *)fLooper)->Stop();
+		fLooper = NULL;
+	}
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/haiku_usb.h

@@ -0,0 +1,112 @@
+/*
+ * Haiku Backend for libusb
+ * Copyright © 2014 Akshay Jaggi <akshay1994.leo@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <List.h>
+#include <Locker.h>
+#include <Autolock.h>
+#include <USBKit.h>
+#include <map>
+#include "libusbi.h"
+#include "haiku_usb_raw.h"
+
+using namespace std;
+
+class USBDevice;
+class USBDeviceHandle;
+class USBTransfer;
+
+class USBDevice {
+public:
+						USBDevice(const char *);
+	virtual					~USBDevice();
+	const char*				Location() const;
+	uint8					CountConfigurations() const;
+	const usb_device_descriptor*		Descriptor() const;
+	const usb_configuration_descriptor*	ConfigurationDescriptor(uint32) const;
+	const usb_configuration_descriptor*	ActiveConfiguration() const;
+	uint8					EndpointToIndex(uint8) const;
+	uint8					EndpointToInterface(uint8) const;
+	int					ClaimInterface(int);
+	int					ReleaseInterface(int);
+	int					CheckInterfacesFree(int);
+	int					SetActiveConfiguration(int);
+	int					ActiveConfigurationIndex() const;
+	bool					InitCheck();
+private:
+	int					Initialise();
+	unsigned int				fClaimedInterfaces;	// Max Interfaces can be 32. Using a bitmask
+	usb_device_descriptor			fDeviceDescriptor;
+	unsigned char**				fConfigurationDescriptors;
+	int					fActiveConfiguration;
+	char*					fPath;
+	map<uint8,uint8>			fConfigToIndex;
+	map<uint8,uint8>*			fEndpointToIndex;
+	map<uint8,uint8>*			fEndpointToInterface;
+	bool					fInitCheck;
+};
+
+class USBDeviceHandle {
+public:
+				USBDeviceHandle(USBDevice *dev);
+	virtual			~USBDeviceHandle();
+	int			ClaimInterface(int);
+	int			ReleaseInterface(int);
+	int			SetConfiguration(int);
+	int			SetAltSetting(int, int);
+	status_t		SubmitTransfer(struct usbi_transfer *);
+	status_t		CancelTransfer(USBTransfer *);
+	bool			InitCheck();
+private:
+	int			fRawFD;
+	static status_t		TransfersThread(void *);
+	void			TransfersWorker();
+	USBDevice*		fUSBDevice;
+	unsigned int		fClaimedInterfaces;
+	BList			fTransfers;
+	BLocker			fTransfersLock;
+	sem_id			fTransfersSem;
+	thread_id		fTransfersThread;
+	bool			fInitCheck;
+};
+
+class USBTransfer {
+public:
+					USBTransfer(struct usbi_transfer *, USBDevice *);
+	virtual				~USBTransfer();
+	void				Do(int);
+	struct usbi_transfer*		UsbiTransfer();
+	void				SetCancelled();
+	bool				IsCancelled();
+private:
+	struct usbi_transfer*		fUsbiTransfer;
+	struct libusb_transfer*		fLibusbTransfer;
+	USBDevice*			fUSBDevice;
+	BLocker				fStatusLock;
+	bool				fCancelled;
+};
+
+class USBRoster {
+public:
+			USBRoster();
+	virtual		~USBRoster();
+	int		Start();
+	void		Stop();
+private:
+	void*		fLooper;
+};

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/haiku_usb_backend.cpp

@@ -0,0 +1,517 @@
+/*
+ * Haiku Backend for libusb
+ * Copyright © 2014 Akshay Jaggi <akshay1994.leo@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <new>
+#include <vector>
+
+#include "haiku_usb.h"
+
+int _errno_to_libusb(int status)
+{
+	return status;
+}
+
+USBTransfer::USBTransfer(struct usbi_transfer *itransfer, USBDevice *device)
+{
+	fUsbiTransfer = itransfer;
+	fLibusbTransfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	fUSBDevice = device;
+	fCancelled = false;
+}
+
+USBTransfer::~USBTransfer()
+{
+}
+
+struct usbi_transfer *
+USBTransfer::UsbiTransfer()
+{
+	return fUsbiTransfer;
+}
+
+void
+USBTransfer::SetCancelled()
+{
+	fCancelled = true;
+}
+
+bool
+USBTransfer::IsCancelled()
+{
+	return fCancelled;
+}
+
+void
+USBTransfer::Do(int fRawFD)
+{
+	switch (fLibusbTransfer->type) {
+		case LIBUSB_TRANSFER_TYPE_CONTROL:
+		{
+			struct libusb_control_setup *setup = (struct libusb_control_setup *)fLibusbTransfer->buffer;
+			usb_raw_command command;
+			command.control.request_type = setup->bmRequestType;
+			command.control.request = setup->bRequest;
+			command.control.value = setup->wValue;
+			command.control.index = setup->wIndex;
+			command.control.length = setup->wLength;
+			command.control.data = fLibusbTransfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
+			if (fCancelled)
+				break;
+			if (ioctl(fRawFD, B_USB_RAW_COMMAND_CONTROL_TRANSFER, &command, sizeof(command)) ||
+					command.control.status != B_USB_RAW_STATUS_SUCCESS) {
+				fUsbiTransfer->transferred = -1;
+				usbi_err(TRANSFER_CTX(fLibusbTransfer), "failed control transfer");
+				break;
+			}
+			fUsbiTransfer->transferred = command.control.length;
+		}
+		break;
+		case LIBUSB_TRANSFER_TYPE_BULK:
+		case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		{
+			usb_raw_command command;
+			command.transfer.interface = fUSBDevice->EndpointToInterface(fLibusbTransfer->endpoint);
+			command.transfer.endpoint = fUSBDevice->EndpointToIndex(fLibusbTransfer->endpoint);
+			command.transfer.data = fLibusbTransfer->buffer;
+			command.transfer.length = fLibusbTransfer->length;
+			if (fCancelled)
+				break;
+			if (fLibusbTransfer->type == LIBUSB_TRANSFER_TYPE_BULK) {
+				if (ioctl(fRawFD, B_USB_RAW_COMMAND_BULK_TRANSFER, &command, sizeof(command)) ||
+						command.transfer.status != B_USB_RAW_STATUS_SUCCESS) {
+					fUsbiTransfer->transferred = -1;
+					usbi_err(TRANSFER_CTX(fLibusbTransfer), "failed bulk transfer");
+					break;
+				}
+			}
+			else {
+				if (ioctl(fRawFD, B_USB_RAW_COMMAND_INTERRUPT_TRANSFER, &command, sizeof(command)) ||
+						command.transfer.status != B_USB_RAW_STATUS_SUCCESS) {
+					fUsbiTransfer->transferred = -1;
+					usbi_err(TRANSFER_CTX(fLibusbTransfer), "failed interrupt transfer");
+					break;
+				}
+			}
+			fUsbiTransfer->transferred = command.transfer.length;
+		}
+		break;
+		// IsochronousTransfers not tested
+		case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		{
+			usb_raw_command command;
+			command.isochronous.interface = fUSBDevice->EndpointToInterface(fLibusbTransfer->endpoint);
+			command.isochronous.endpoint = fUSBDevice->EndpointToIndex(fLibusbTransfer->endpoint);
+			command.isochronous.data = fLibusbTransfer->buffer;
+			command.isochronous.length = fLibusbTransfer->length;
+			command.isochronous.packet_count = fLibusbTransfer->num_iso_packets;
+			int i;
+			usb_iso_packet_descriptor *packetDescriptors = new usb_iso_packet_descriptor[fLibusbTransfer->num_iso_packets];
+			for (i = 0; i < fLibusbTransfer->num_iso_packets; i++) {
+				if ((int16)(fLibusbTransfer->iso_packet_desc[i]).length != (fLibusbTransfer->iso_packet_desc[i]).length) {
+					fUsbiTransfer->transferred = -1;
+					usbi_err(TRANSFER_CTX(fLibusbTransfer), "failed isochronous transfer");
+					break;
+				}
+				packetDescriptors[i].request_length = (int16)(fLibusbTransfer->iso_packet_desc[i]).length;
+			}
+			if (i < fLibusbTransfer->num_iso_packets)
+				break;	// TODO Handle this error
+			command.isochronous.packet_descriptors = packetDescriptors;
+			if (fCancelled)
+				break;
+			if (ioctl(fRawFD, B_USB_RAW_COMMAND_ISOCHRONOUS_TRANSFER, &command, sizeof(command)) ||
+					command.isochronous.status != B_USB_RAW_STATUS_SUCCESS) {
+				fUsbiTransfer->transferred = -1;
+				usbi_err(TRANSFER_CTX(fLibusbTransfer), "failed isochronous transfer");
+				break;
+			}
+			for (i = 0; i < fLibusbTransfer->num_iso_packets; i++) {
+				(fLibusbTransfer->iso_packet_desc[i]).actual_length = packetDescriptors[i].actual_length;
+				switch (packetDescriptors[i].status) {
+					case B_OK:
+						(fLibusbTransfer->iso_packet_desc[i]).status = LIBUSB_TRANSFER_COMPLETED;
+						break;
+					default:
+						(fLibusbTransfer->iso_packet_desc[i]).status = LIBUSB_TRANSFER_ERROR;
+						break;
+				}
+			}
+			delete[] packetDescriptors;
+			// Do we put the length of transfer here, for isochronous transfers?
+			fUsbiTransfer->transferred = command.transfer.length;
+		}
+		break;
+		default:
+			usbi_err(TRANSFER_CTX(fLibusbTransfer), "Unknown type of transfer");
+	}
+}
+
+bool
+USBDeviceHandle::InitCheck()
+{
+	return fInitCheck;
+}
+
+status_t
+USBDeviceHandle::TransfersThread(void *self)
+{
+	USBDeviceHandle *handle = (USBDeviceHandle *)self;
+	handle->TransfersWorker();
+	return B_OK;
+}
+
+void
+USBDeviceHandle::TransfersWorker()
+{
+	while (true) {
+		status_t status = acquire_sem(fTransfersSem);
+		if (status == B_BAD_SEM_ID)
+			break;
+		if (status == B_INTERRUPTED)
+			continue;
+		fTransfersLock.Lock();
+		USBTransfer *fPendingTransfer = (USBTransfer *) fTransfers.RemoveItem((int32)0);
+		fTransfersLock.Unlock();
+		fPendingTransfer->Do(fRawFD);
+		usbi_signal_transfer_completion(fPendingTransfer->UsbiTransfer());
+	}
+}
+
+status_t
+USBDeviceHandle::SubmitTransfer(struct usbi_transfer *itransfer)
+{
+	USBTransfer *transfer = new USBTransfer(itransfer, fUSBDevice);
+	*((USBTransfer **)usbi_transfer_get_os_priv(itransfer)) = transfer;
+	BAutolock locker(fTransfersLock);
+	fTransfers.AddItem(transfer);
+	release_sem(fTransfersSem);
+	return LIBUSB_SUCCESS;
+}
+
+status_t
+USBDeviceHandle::CancelTransfer(USBTransfer *transfer)
+{
+	transfer->SetCancelled();
+	fTransfersLock.Lock();
+	bool removed = fTransfers.RemoveItem(transfer);
+	fTransfersLock.Unlock();
+	if(removed)
+		usbi_signal_transfer_completion(transfer->UsbiTransfer());
+	return LIBUSB_SUCCESS;
+}
+
+USBDeviceHandle::USBDeviceHandle(USBDevice *dev)
+	:
+	fTransfersThread(-1),
+	fUSBDevice(dev),
+	fClaimedInterfaces(0),
+	fInitCheck(false)
+{
+	fRawFD = open(dev->Location(), O_RDWR | O_CLOEXEC);
+	if (fRawFD < 0) {
+		usbi_err(NULL,"failed to open device");
+		return;
+	}
+	fTransfersSem = create_sem(0, "Transfers Queue Sem");
+	fTransfersThread = spawn_thread(TransfersThread, "Transfer Worker", B_NORMAL_PRIORITY, this);
+	resume_thread(fTransfersThread);
+	fInitCheck = true;
+}
+
+USBDeviceHandle::~USBDeviceHandle()
+{
+	if (fRawFD > 0)
+		close(fRawFD);
+	for(int i = 0; i < 32; i++) {
+		if (fClaimedInterfaces & (1 << i))
+			ReleaseInterface(i);
+	}
+	delete_sem(fTransfersSem);
+	if (fTransfersThread > 0)
+		wait_for_thread(fTransfersThread, NULL);
+}
+
+int
+USBDeviceHandle::ClaimInterface(int inumber)
+{
+	int status = fUSBDevice->ClaimInterface(inumber);
+	if (status == LIBUSB_SUCCESS)
+		fClaimedInterfaces |= (1 << inumber);
+	return status;
+}
+
+int
+USBDeviceHandle::ReleaseInterface(int inumber)
+{
+	fUSBDevice->ReleaseInterface(inumber);
+	fClaimedInterfaces &= ~(1 << inumber);
+	return LIBUSB_SUCCESS;
+}
+
+int
+USBDeviceHandle::SetConfiguration(int config)
+{
+	int config_index = fUSBDevice->CheckInterfacesFree(config);
+	if(config_index == LIBUSB_ERROR_BUSY || config_index == LIBUSB_ERROR_NOT_FOUND)
+		return config_index;
+	usb_raw_command command;
+	command.config.config_index = config_index;
+	if (ioctl(fRawFD, B_USB_RAW_COMMAND_SET_CONFIGURATION, &command, sizeof(command)) ||
+			command.config.status != B_USB_RAW_STATUS_SUCCESS) {
+		return _errno_to_libusb(command.config.status);
+	}
+	fUSBDevice->SetActiveConfiguration(config_index);
+	return LIBUSB_SUCCESS;
+}
+
+int
+USBDeviceHandle::SetAltSetting(int inumber, int alt)
+{
+	usb_raw_command command;
+	command.alternate.config_index = fUSBDevice->ActiveConfigurationIndex();
+	command.alternate.interface_index = inumber;
+	if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_ACTIVE_ALT_INTERFACE_INDEX, &command, sizeof(command)) ||
+			command.alternate.status != B_USB_RAW_STATUS_SUCCESS) {
+		usbi_err(NULL, "Error retrieving active alternate interface");
+		return _errno_to_libusb(command.alternate.status);
+	}
+	if (command.alternate.alternate_info == alt) {
+		usbi_dbg("Setting alternate interface successful");
+		return LIBUSB_SUCCESS;
+	}
+	command.alternate.alternate_info = alt;
+	if (ioctl(fRawFD, B_USB_RAW_COMMAND_SET_ALT_INTERFACE, &command, sizeof(command)) ||
+			command.alternate.status != B_USB_RAW_STATUS_SUCCESS) { //IF IOCTL FAILS DEVICE DISONNECTED PROBABLY
+		usbi_err(NULL, "Error setting alternate interface");
+		return _errno_to_libusb(command.alternate.status);
+	}
+	usbi_dbg("Setting alternate interface successful");
+	return LIBUSB_SUCCESS;
+}
+
+
+USBDevice::USBDevice(const char *path)
+	:
+	fPath(NULL),
+	fActiveConfiguration(0),	//0?
+	fConfigurationDescriptors(NULL),
+	fClaimedInterfaces(0),
+	fEndpointToIndex(NULL),
+	fEndpointToInterface(NULL),
+	fInitCheck(false)
+{
+	fPath=strdup(path);
+	Initialise();
+}
+
+USBDevice::~USBDevice()
+{
+	free(fPath);
+	if (fConfigurationDescriptors) {
+		for(int i = 0; i < fDeviceDescriptor.num_configurations; i++) {
+			if (fConfigurationDescriptors[i])
+				delete fConfigurationDescriptors[i];
+		}
+		delete[] fConfigurationDescriptors;
+	}
+	if (fEndpointToIndex)
+		delete[] fEndpointToIndex;
+	if (fEndpointToInterface)
+		delete[] fEndpointToInterface;
+}
+
+bool
+USBDevice::InitCheck()
+{
+	return fInitCheck;
+}
+
+const char *
+USBDevice::Location() const
+{
+	return fPath;
+}
+
+uint8
+USBDevice::CountConfigurations() const
+{
+	return fDeviceDescriptor.num_configurations;
+}
+
+const usb_device_descriptor *
+USBDevice::Descriptor() const
+{
+	return &fDeviceDescriptor;
+}
+
+const usb_configuration_descriptor *
+USBDevice::ConfigurationDescriptor(uint32 index) const
+{
+	if (index > CountConfigurations())
+		return NULL;
+	return (usb_configuration_descriptor *) fConfigurationDescriptors[index];
+}
+
+const usb_configuration_descriptor *
+USBDevice::ActiveConfiguration() const
+{
+	return (usb_configuration_descriptor *) fConfigurationDescriptors[fActiveConfiguration];
+}
+
+int
+USBDevice::ActiveConfigurationIndex() const
+{
+	return fActiveConfiguration;
+}
+
+int USBDevice::ClaimInterface(int interface)
+{
+	if (interface > ActiveConfiguration()->number_interfaces)
+		return LIBUSB_ERROR_NOT_FOUND;
+	if (fClaimedInterfaces & (1 << interface))
+		return LIBUSB_ERROR_BUSY;
+	fClaimedInterfaces |= (1 << interface);
+	return LIBUSB_SUCCESS;
+}
+
+int USBDevice::ReleaseInterface(int interface)
+{
+	fClaimedInterfaces &= ~(1 << interface);
+	return LIBUSB_SUCCESS;
+}
+
+int
+USBDevice::CheckInterfacesFree(int config)
+{
+	if (fConfigToIndex.count(config) == 0)
+		return LIBUSB_ERROR_NOT_FOUND;
+	if (fClaimedInterfaces == 0)
+		return fConfigToIndex[(uint8)config];
+	return LIBUSB_ERROR_BUSY;
+}
+
+int
+USBDevice::SetActiveConfiguration(int config_index)
+{
+	fActiveConfiguration = config_index;
+	return LIBUSB_SUCCESS;
+}
+
+uint8
+USBDevice::EndpointToIndex(uint8 address) const
+{
+	return fEndpointToIndex[fActiveConfiguration][address];
+}
+
+uint8
+USBDevice::EndpointToInterface(uint8 address) const
+{
+	return fEndpointToInterface[fActiveConfiguration][address];
+}
+
+int
+USBDevice::Initialise()		//Do we need more error checking, etc? How to report?
+{
+	int fRawFD = open(fPath, O_RDWR | O_CLOEXEC);
+	if (fRawFD < 0)
+		return B_ERROR;
+	usb_raw_command command;
+	command.device.descriptor = &fDeviceDescriptor;
+	if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_DEVICE_DESCRIPTOR, &command, sizeof(command)) ||
+			command.device.status != B_USB_RAW_STATUS_SUCCESS) {
+		close(fRawFD);
+		return B_ERROR;
+	}
+
+	fConfigurationDescriptors = new(std::nothrow) unsigned char *[fDeviceDescriptor.num_configurations];
+	fEndpointToIndex = new(std::nothrow) map<uint8,uint8> [fDeviceDescriptor.num_configurations];
+	fEndpointToInterface = new(std::nothrow) map<uint8,uint8> [fDeviceDescriptor.num_configurations];
+	for (int i = 0; i < fDeviceDescriptor.num_configurations; i++) {
+		usb_configuration_descriptor tmp_config;
+		command.config.descriptor = &tmp_config;
+		command.config.config_index = i;
+		if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_CONFIGURATION_DESCRIPTOR, &command, sizeof(command)) ||
+				command.config.status != B_USB_RAW_STATUS_SUCCESS) {
+			usbi_err(NULL, "failed retrieving configuration descriptor");
+			close(fRawFD);
+			return B_ERROR;
+		}
+		fConfigToIndex[tmp_config.configuration_value] = i;
+		fConfigurationDescriptors[i] = new(std::nothrow) unsigned char[tmp_config.total_length];
+		command.control.request_type = 128;
+		command.control.request = 6;
+		command.control.value = (2 << 8) | i;
+		command.control.index = 0;
+		command.control.length = tmp_config.total_length;
+		command.control.data = fConfigurationDescriptors[i];
+		if (ioctl(fRawFD, B_USB_RAW_COMMAND_CONTROL_TRANSFER, &command, sizeof(command)) ||
+				command.control.status!=B_USB_RAW_STATUS_SUCCESS) {
+			usbi_err(NULL, "failed retrieving full configuration descriptor");
+			close(fRawFD);
+			return B_ERROR;
+		}
+		for (int j = 0; j < tmp_config.number_interfaces; j++) {
+			command.alternate.config_index = i;
+			command.alternate.interface_index = j;
+			if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_ALT_INTERFACE_COUNT, &command, sizeof(command)) ||
+					command.config.status != B_USB_RAW_STATUS_SUCCESS) {
+				usbi_err(NULL, "failed retrieving number of alternate interfaces");
+				close(fRawFD);
+				return B_ERROR;
+			}
+			int num_alternate = command.alternate.alternate_info;
+			for (int k = 0; k < num_alternate; k++) {
+				usb_interface_descriptor tmp_interface;
+				command.interface_etc.config_index = i;
+				command.interface_etc.interface_index = j;
+				command.interface_etc.alternate_index = k;
+				command.interface_etc.descriptor = &tmp_interface;
+				if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_INTERFACE_DESCRIPTOR_ETC, &command, sizeof(command)) ||
+						command.config.status != B_USB_RAW_STATUS_SUCCESS) {
+					usbi_err(NULL, "failed retrieving interface descriptor");
+					close(fRawFD);
+					return B_ERROR;
+				}
+				for (int l = 0; l < tmp_interface.num_endpoints; l++) {
+					usb_endpoint_descriptor tmp_endpoint;
+					command.endpoint_etc.config_index = i;
+					command.endpoint_etc.interface_index = j;
+					command.endpoint_etc.alternate_index = k;
+					command.endpoint_etc.endpoint_index = l;
+					command.endpoint_etc.descriptor = &tmp_endpoint;
+					if (ioctl(fRawFD, B_USB_RAW_COMMAND_GET_ENDPOINT_DESCRIPTOR_ETC, &command, sizeof(command)) ||
+							command.config.status != B_USB_RAW_STATUS_SUCCESS) {
+						usbi_err(NULL, "failed retrieving endpoint descriptor");
+						close(fRawFD);
+						return B_ERROR;
+					}
+					fEndpointToIndex[i][tmp_endpoint.endpoint_address] = l;
+					fEndpointToInterface[i][tmp_endpoint.endpoint_address] = j;
+				}
+			}
+		}
+	}
+	close(fRawFD);
+	fInitCheck = true;
+	return B_OK;
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/haiku_usb_raw.cpp

@@ -0,0 +1,250 @@
+/*
+ * Haiku Backend for libusb
+ * Copyright © 2014 Akshay Jaggi <akshay1994.leo@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <new>
+#include <vector>
+
+#include "haiku_usb.h"
+
+USBRoster gUsbRoster;
+int32 gInitCount = 0;
+
+static int
+haiku_init(struct libusb_context *ctx)
+{
+	if (atomic_add(&gInitCount, 1) == 0)
+		return gUsbRoster.Start();
+	return LIBUSB_SUCCESS;
+}
+
+static void
+haiku_exit(void)
+{
+	if (atomic_add(&gInitCount, -1) == 1)
+		gUsbRoster.Stop();
+}
+
+static int
+haiku_open(struct libusb_device_handle *dev_handle)
+{
+	USBDevice *dev = *((USBDevice **)dev_handle->dev->os_priv);
+	USBDeviceHandle *handle = new(std::nothrow) USBDeviceHandle(dev);
+	if (handle == NULL)
+		return LIBUSB_ERROR_NO_MEM;
+	if (handle->InitCheck() == false) {
+		delete handle;
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+	*((USBDeviceHandle **)dev_handle->os_priv) = handle;
+	return LIBUSB_SUCCESS;
+}
+
+static void
+haiku_close(struct libusb_device_handle *dev_handle)
+{
+	USBDeviceHandle *handle = *((USBDeviceHandle **)dev_handle->os_priv);
+	if (handle == NULL)
+		return;
+	delete handle;
+	*((USBDeviceHandle **)dev_handle->os_priv) = NULL;
+}
+
+static int
+haiku_get_device_descriptor(struct libusb_device *device, unsigned char *buffer, int *host_endian)
+{
+	USBDevice *dev = *((USBDevice **)device->os_priv);
+	memcpy(buffer, dev->Descriptor(), DEVICE_DESC_LENGTH);
+	*host_endian = 0;
+	return LIBUSB_SUCCESS;
+}
+
+static int
+haiku_get_active_config_descriptor(struct libusb_device *device, unsigned char *buffer, size_t len, int *host_endian)
+{
+	USBDevice *dev = *((USBDevice **)device->os_priv);
+	const usb_configuration_descriptor *act_config = dev->ActiveConfiguration();
+	if (len > act_config->total_length)
+		return LIBUSB_ERROR_OVERFLOW;
+	memcpy(buffer, act_config, len);
+	*host_endian = 0;
+	return LIBUSB_SUCCESS;
+}
+
+static int
+haiku_get_config_descriptor(struct libusb_device *device, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
+{
+	USBDevice *dev = *((USBDevice **)device->os_priv);
+	const usb_configuration_descriptor *config = dev->ConfigurationDescriptor(config_index);
+	if (config == NULL) {
+		usbi_err(DEVICE_CTX(device), "failed getting configuration descriptor");
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+	if (len > config->total_length)
+		len = config->total_length;
+	memcpy(buffer, config, len);
+	*host_endian = 0;
+	return len;
+}
+
+static int
+haiku_set_configuration(struct libusb_device_handle *dev_handle, int config)
+{
+	USBDeviceHandle *handle= *((USBDeviceHandle **)dev_handle->os_priv);
+	return handle->SetConfiguration(config);
+}
+
+static int
+haiku_claim_interface(struct libusb_device_handle *dev_handle, int interface_number)
+{
+	USBDeviceHandle *handle = *((USBDeviceHandle **)dev_handle->os_priv);
+	return handle->ClaimInterface(interface_number);
+}
+
+static int
+haiku_set_altsetting(struct libusb_device_handle *dev_handle, int interface_number, int altsetting)
+{
+	USBDeviceHandle *handle = *((USBDeviceHandle **)dev_handle->os_priv);
+	return handle->SetAltSetting(interface_number, altsetting);
+}
+
+static int
+haiku_release_interface(struct libusb_device_handle *dev_handle, int interface_number)
+{
+	USBDeviceHandle *handle = *((USBDeviceHandle **)dev_handle->os_priv);
+	haiku_set_altsetting(dev_handle,interface_number, 0);
+	return handle->ReleaseInterface(interface_number);
+}
+
+static int
+haiku_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *fLibusbTransfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	USBDeviceHandle *fDeviceHandle = *((USBDeviceHandle **)fLibusbTransfer->dev_handle->os_priv);
+	return fDeviceHandle->SubmitTransfer(itransfer);
+}
+
+static int
+haiku_cancel_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *fLibusbTransfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	USBDeviceHandle *fDeviceHandle = *((USBDeviceHandle **)fLibusbTransfer->dev_handle->os_priv);
+	return fDeviceHandle->CancelTransfer(*((USBTransfer **)usbi_transfer_get_os_priv(itransfer)));
+}
+
+static void
+haiku_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	USBTransfer *transfer = *((USBTransfer **)usbi_transfer_get_os_priv(itransfer));
+	delete transfer;
+	*((USBTransfer **)usbi_transfer_get_os_priv(itransfer)) = NULL;
+}
+
+static int
+haiku_handle_transfer_completion(struct usbi_transfer *itransfer)
+{
+	USBTransfer *transfer = *((USBTransfer **)usbi_transfer_get_os_priv(itransfer));
+
+	usbi_mutex_lock(&itransfer->lock);
+	if (transfer->IsCancelled()) {
+		delete transfer;
+		*((USBTransfer **)usbi_transfer_get_os_priv(itransfer)) = NULL;
+		usbi_mutex_unlock(&itransfer->lock);
+		if (itransfer->transferred < 0)
+			itransfer->transferred = 0;
+		return usbi_handle_transfer_cancellation(itransfer);
+	}
+	libusb_transfer_status status = LIBUSB_TRANSFER_COMPLETED;
+	if (itransfer->transferred < 0) {
+		usbi_err(ITRANSFER_CTX(itransfer), "error in transfer");
+		status = LIBUSB_TRANSFER_ERROR;
+		itransfer->transferred = 0;
+	}
+	delete transfer;
+	*((USBTransfer **)usbi_transfer_get_os_priv(itransfer)) = NULL;
+	usbi_mutex_unlock(&itransfer->lock);
+	return usbi_handle_transfer_completion(itransfer, status);
+}
+
+static int
+haiku_clock_gettime(int clkid, struct timespec *tp)
+{
+	if (clkid == USBI_CLOCK_REALTIME)
+		return clock_gettime(CLOCK_REALTIME, tp);
+	if (clkid == USBI_CLOCK_MONOTONIC)
+		return clock_gettime(CLOCK_MONOTONIC, tp);
+	return LIBUSB_ERROR_INVALID_PARAM;
+}
+
+const struct usbi_os_backend haiku_usb_raw_backend = {
+	/*.name =*/ "Haiku usbfs",
+	/*.caps =*/ 0,
+	/*.init =*/ haiku_init,
+	/*.exit =*/ haiku_exit,
+	/*.get_device_list =*/ NULL,
+	/*.hotplug_poll =*/ NULL,
+	/*.open =*/ haiku_open,
+	/*.close =*/ haiku_close,
+	/*.get_device_descriptor =*/ haiku_get_device_descriptor,
+	/*.get_active_config_descriptor =*/ haiku_get_active_config_descriptor,
+	/*.get_config_descriptor =*/ haiku_get_config_descriptor,
+	/*.get_config_descriptor_by_value =*/ NULL,
+
+
+	/*.get_configuration =*/ NULL,
+	/*.set_configuration =*/ haiku_set_configuration,
+	/*.claim_interface =*/ haiku_claim_interface,
+	/*.release_interface =*/ haiku_release_interface,
+
+	/*.set_interface_altsetting =*/ haiku_set_altsetting,
+	/*.clear_halt =*/ NULL,
+	/*.reset_device =*/ NULL,
+
+	/*.alloc_streams =*/ NULL,
+	/*.free_streams =*/ NULL,
+
+	/*.dev_mem_alloc =*/ NULL,
+	/*.dev_mem_free =*/ NULL,
+
+	/*.kernel_driver_active =*/ NULL,
+	/*.detach_kernel_driver =*/ NULL,
+	/*.attach_kernel_driver =*/ NULL,
+
+	/*.destroy_device =*/ NULL,
+
+	/*.submit_transfer =*/ haiku_submit_transfer,
+	/*.cancel_transfer =*/ haiku_cancel_transfer,
+	/*.clear_transfer_priv =*/ haiku_clear_transfer_priv,
+
+	/*.handle_events =*/ NULL,
+	/*.handle_transfer_completion =*/ haiku_handle_transfer_completion,
+
+	/*.clock_gettime =*/ haiku_clock_gettime,
+
+#ifdef USBI_TIMERFD_AVAILABLE
+	/*.get_timerfd_clockid =*/ NULL,
+#endif
+
+	/*.device_priv_size =*/ sizeof(USBDevice *),
+	/*.device_handle_priv_size =*/ sizeof(USBDeviceHandle *),
+	/*.transfer_priv_size =*/ sizeof(USBTransfer *),
+};

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/haiku_usb_raw.h

@@ -0,0 +1,180 @@
+/*
+ * Copyright 2006-2008, Haiku Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#ifndef _USB_RAW_H_
+#define _USB_RAW_H_
+
+#include <USB3.h>
+
+#define B_USB_RAW_PROTOCOL_VERSION	0x0015
+#define B_USB_RAW_ACTIVE_ALTERNATE	0xffffffff
+
+typedef enum {
+	B_USB_RAW_COMMAND_GET_VERSION = 0x1000,
+
+	B_USB_RAW_COMMAND_GET_DEVICE_DESCRIPTOR = 0x2000,
+	B_USB_RAW_COMMAND_GET_CONFIGURATION_DESCRIPTOR,
+	B_USB_RAW_COMMAND_GET_INTERFACE_DESCRIPTOR,
+	B_USB_RAW_COMMAND_GET_ENDPOINT_DESCRIPTOR,
+	B_USB_RAW_COMMAND_GET_STRING_DESCRIPTOR,
+	B_USB_RAW_COMMAND_GET_GENERIC_DESCRIPTOR,
+	B_USB_RAW_COMMAND_GET_ALT_INTERFACE_COUNT,
+	B_USB_RAW_COMMAND_GET_ACTIVE_ALT_INTERFACE_INDEX,
+	B_USB_RAW_COMMAND_GET_INTERFACE_DESCRIPTOR_ETC,
+	B_USB_RAW_COMMAND_GET_ENDPOINT_DESCRIPTOR_ETC,
+	B_USB_RAW_COMMAND_GET_GENERIC_DESCRIPTOR_ETC,
+
+	B_USB_RAW_COMMAND_SET_CONFIGURATION = 0x3000,
+	B_USB_RAW_COMMAND_SET_FEATURE,
+	B_USB_RAW_COMMAND_CLEAR_FEATURE,
+	B_USB_RAW_COMMAND_GET_STATUS,
+	B_USB_RAW_COMMAND_GET_DESCRIPTOR,
+	B_USB_RAW_COMMAND_SET_ALT_INTERFACE,
+
+	B_USB_RAW_COMMAND_CONTROL_TRANSFER = 0x4000,
+	B_USB_RAW_COMMAND_INTERRUPT_TRANSFER,
+	B_USB_RAW_COMMAND_BULK_TRANSFER,
+	B_USB_RAW_COMMAND_ISOCHRONOUS_TRANSFER
+} usb_raw_command_id;
+
+
+typedef enum {
+	B_USB_RAW_STATUS_SUCCESS = 0,
+
+	B_USB_RAW_STATUS_FAILED,
+	B_USB_RAW_STATUS_ABORTED,
+	B_USB_RAW_STATUS_STALLED,
+	B_USB_RAW_STATUS_CRC_ERROR,
+	B_USB_RAW_STATUS_TIMEOUT,
+
+	B_USB_RAW_STATUS_INVALID_CONFIGURATION,
+	B_USB_RAW_STATUS_INVALID_INTERFACE,
+	B_USB_RAW_STATUS_INVALID_ENDPOINT,
+	B_USB_RAW_STATUS_INVALID_STRING,
+
+	B_USB_RAW_STATUS_NO_MEMORY
+} usb_raw_command_status;
+
+
+typedef union {
+	struct {
+		status_t status;
+	} version;
+
+	struct {
+		status_t status;
+		usb_device_descriptor *descriptor;
+	} device;
+
+	struct {
+		status_t status;
+		usb_configuration_descriptor *descriptor;
+		uint32 config_index;
+	} config;
+
+	struct {
+		status_t status;
+		uint32 alternate_info;
+		uint32 config_index;
+		uint32 interface_index;
+	} alternate;
+
+	struct {
+		status_t status;
+		usb_interface_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+	} interface;
+
+	struct {
+		status_t status;
+		usb_interface_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+		uint32 alternate_index;
+	} interface_etc;
+
+	struct {
+		status_t status;
+		usb_endpoint_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+		uint32 endpoint_index;
+	} endpoint;
+
+	struct {
+		status_t status;
+		usb_endpoint_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+		uint32 alternate_index;
+		uint32 endpoint_index;
+	} endpoint_etc;
+
+	struct {
+		status_t status;
+		usb_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+		uint32 generic_index;
+		size_t length;
+	} generic;
+
+	struct {
+		status_t status;
+		usb_descriptor *descriptor;
+		uint32 config_index;
+		uint32 interface_index;
+		uint32 alternate_index;
+		uint32 generic_index;
+		size_t length;
+	} generic_etc;
+
+	struct {
+		status_t status;
+		usb_string_descriptor *descriptor;
+		uint32 string_index;
+		size_t length;
+	} string;
+
+	struct {
+		status_t status;
+		uint8 type;
+		uint8 index;
+		uint16 language_id;
+		void *data;
+		size_t length;
+	} descriptor;
+
+	struct {
+		status_t status;
+		uint8 request_type;
+		uint8 request;
+		uint16 value;
+		uint16 index;
+		uint16 length;
+		void *data;
+	} control;
+
+	struct {
+		status_t status;
+		uint32 interface;
+		uint32 endpoint;
+		void *data;
+		size_t length;
+	} transfer;
+
+	struct {
+		status_t status;
+		uint32 interface;
+		uint32 endpoint;
+		void *data;
+		size_t length;
+		usb_iso_packet_descriptor *packet_descriptors;
+		uint32 packet_count;
+	} isochronous;
+} usb_raw_command;
+
+#endif // _USB_RAW_H_

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/linux_netlink.c

@@ -0,0 +1,400 @@
+/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
+/*
+ * Linux usbfs backend for libusb
+ * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
+ * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
+ * Copyright (c) 2013 Nathan Hjelm <hjelmn@mac.com>
+ * Copyright (c) 2016 Chris Dickens <christopher.a.dickens@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#ifdef HAVE_ASM_TYPES_H
+#include <asm/types.h>
+#endif
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#include "libusbi.h"
+#include "linux_usbfs.h"
+
+#define NL_GROUP_KERNEL 1
+
+static int linux_netlink_socket = -1;
+static int netlink_control_pipe[2] = { -1, -1 };
+static pthread_t libusb_linux_event_thread;
+
+static void *linux_netlink_event_thread_main(void *arg);
+
+static int set_fd_cloexec_nb(int fd)
+{
+	int flags;
+
+#if defined(FD_CLOEXEC)
+	flags = fcntl(fd, F_GETFD);
+	if (flags == -1) {
+		usbi_err(NULL, "failed to get netlink fd flags (%d)", errno);
+		return -1;
+	}
+
+	if (!(flags & FD_CLOEXEC)) {
+		if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
+			usbi_err(NULL, "failed to set netlink fd flags (%d)", errno);
+			return -1;
+		}
+	}
+#endif
+
+	flags = fcntl(fd, F_GETFL);
+	if (flags == -1) {
+		usbi_err(NULL, "failed to get netlink fd status flags (%d)", errno);
+		return -1;
+	}
+
+	if (!(flags & O_NONBLOCK)) {
+		if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
+			usbi_err(NULL, "failed to set netlink fd status flags (%d)", errno);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int linux_netlink_start_event_monitor(void)
+{
+	struct sockaddr_nl sa_nl = { .nl_family = AF_NETLINK, .nl_groups = NL_GROUP_KERNEL };
+	int socktype = SOCK_RAW;
+	int opt = 1;
+	int ret;
+
+#if defined(SOCK_CLOEXEC)
+	socktype |= SOCK_CLOEXEC;
+#endif
+#if defined(SOCK_NONBLOCK)
+	socktype |= SOCK_NONBLOCK;
+#endif
+
+	linux_netlink_socket = socket(PF_NETLINK, socktype, NETLINK_KOBJECT_UEVENT);
+	if (linux_netlink_socket == -1 && errno == EINVAL) {
+		usbi_dbg("failed to create netlink socket of type %d, attempting SOCK_RAW", socktype);
+		linux_netlink_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
+	}
+
+	if (linux_netlink_socket == -1) {
+		usbi_err(NULL, "failed to create netlink socket (%d)", errno);
+		goto err;
+	}
+
+	ret = set_fd_cloexec_nb(linux_netlink_socket);
+	if (ret == -1)
+		goto err_close_socket;
+
+	ret = bind(linux_netlink_socket, (struct sockaddr *)&sa_nl, sizeof(sa_nl));
+	if (ret == -1) {
+		usbi_err(NULL, "failed to bind netlink socket (%d)", errno);
+		goto err_close_socket;
+	}
+
+	ret = setsockopt(linux_netlink_socket, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt));
+	if (ret == -1) {
+		usbi_err(NULL, "failed to set netlink socket SO_PASSCRED option (%d)", errno);
+		goto err_close_socket;
+	}
+
+	ret = usbi_pipe(netlink_control_pipe);
+	if (ret) {
+		usbi_err(NULL, "failed to create netlink control pipe");
+		goto err_close_socket;
+	}
+
+	ret = pthread_create(&libusb_linux_event_thread, NULL, linux_netlink_event_thread_main, NULL);
+	if (ret != 0) {
+		usbi_err(NULL, "failed to create netlink event thread (%d)", ret);
+		goto err_close_pipe;
+	}
+
+	return LIBUSB_SUCCESS;
+
+err_close_pipe:
+	close(netlink_control_pipe[0]);
+	close(netlink_control_pipe[1]);
+	netlink_control_pipe[0] = -1;
+	netlink_control_pipe[1] = -1;
+err_close_socket:
+	close(linux_netlink_socket);
+	linux_netlink_socket = -1;
+err:
+	return LIBUSB_ERROR_OTHER;
+}
+
+int linux_netlink_stop_event_monitor(void)
+{
+	char dummy = 1;
+	ssize_t r;
+
+	assert(linux_netlink_socket != -1);
+
+	/* Write some dummy data to the control pipe and
+	 * wait for the thread to exit */
+	r = usbi_write(netlink_control_pipe[1], &dummy, sizeof(dummy));
+	if (r <= 0)
+		usbi_warn(NULL, "netlink control pipe signal failed");
+
+	pthread_join(libusb_linux_event_thread, NULL);
+
+	close(linux_netlink_socket);
+	linux_netlink_socket = -1;
+
+	/* close and reset control pipe */
+	close(netlink_control_pipe[0]);
+	close(netlink_control_pipe[1]);
+	netlink_control_pipe[0] = -1;
+	netlink_control_pipe[1] = -1;
+
+	return LIBUSB_SUCCESS;
+}
+
+static const char *netlink_message_parse(const char *buffer, size_t len, const char *key)
+{
+	const char *end = buffer + len;
+	size_t keylen = strlen(key);
+
+	while (buffer < end && *buffer) {
+		if (strncmp(buffer, key, keylen) == 0 && buffer[keylen] == '=')
+			return buffer + keylen + 1;
+		buffer += strlen(buffer) + 1;
+	}
+
+	return NULL;
+}
+
+/* parse parts of netlink message common to both libudev and the kernel */
+static int linux_netlink_parse(const char *buffer, size_t len, int *detached,
+	const char **sys_name, uint8_t *busnum, uint8_t *devaddr)
+{
+	const char *tmp, *slash;
+
+	errno = 0;
+
+	*sys_name = NULL;
+	*detached = 0;
+	*busnum   = 0;
+	*devaddr  = 0;
+
+	tmp = netlink_message_parse(buffer, len, "ACTION");
+	if (!tmp) {
+		return -1;
+	} else if (strcmp(tmp, "remove") == 0) {
+		*detached = 1;
+	} else if (strcmp(tmp, "add") != 0) {
+		usbi_dbg("unknown device action %s", tmp);
+		return -1;
+	}
+
+	/* check that this is a usb message */
+	tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
+	if (!tmp || strcmp(tmp, "usb") != 0) {
+		/* not usb. ignore */
+		return -1;
+	}
+
+	/* check that this is an actual usb device */
+	tmp = netlink_message_parse(buffer, len, "DEVTYPE");
+	if (!tmp || strcmp(tmp, "usb_device") != 0) {
+		/* not usb. ignore */
+		return -1;
+	}
+
+	tmp = netlink_message_parse(buffer, len, "BUSNUM");
+	if (tmp) {
+		*busnum = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
+		if (errno) {
+			errno = 0;
+			return -1;
+		}
+
+		tmp = netlink_message_parse(buffer, len, "DEVNUM");
+		if (NULL == tmp)
+			return -1;
+
+		*devaddr = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
+		if (errno) {
+			errno = 0;
+			return -1;
+		}
+	} else {
+		/* no bus number. try "DEVICE" */
+		tmp = netlink_message_parse(buffer, len, "DEVICE");
+		if (!tmp) {
+			/* not usb. ignore */
+			return -1;
+		}
+
+		/* Parse a device path such as /dev/bus/usb/003/004 */
+		slash = strrchr(tmp, '/');
+		if (!slash)
+			return -1;
+
+		*busnum = (uint8_t)(strtoul(slash - 3, NULL, 10) & 0xff);
+		if (errno) {
+			errno = 0;
+			return -1;
+		}
+
+		*devaddr = (uint8_t)(strtoul(slash + 1, NULL, 10) & 0xff);
+		if (errno) {
+			errno = 0;
+			return -1;
+		}
+
+		return 0;
+	}
+
+	tmp = netlink_message_parse(buffer, len, "DEVPATH");
+	if (!tmp)
+		return -1;
+
+	slash = strrchr(tmp, '/');
+	if (slash)
+		*sys_name = slash + 1;
+
+	/* found a usb device */
+	return 0;
+}
+
+static int linux_netlink_read_message(void)
+{
+	char cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
+	char msg_buffer[2048];
+	const char *sys_name = NULL;
+	uint8_t busnum, devaddr;
+	int detached, r;
+	ssize_t len;
+	struct cmsghdr *cmsg;
+	struct ucred *cred;
+	struct sockaddr_nl sa_nl;
+	struct iovec iov = { .iov_base = msg_buffer, .iov_len = sizeof(msg_buffer) };
+	struct msghdr msg = {
+		.msg_iov = &iov, .msg_iovlen = 1,
+		.msg_control = cred_buffer, .msg_controllen = sizeof(cred_buffer),
+		.msg_name = &sa_nl, .msg_namelen = sizeof(sa_nl)
+	};
+
+	/* read netlink message */
+	len = recvmsg(linux_netlink_socket, &msg, 0);
+	if (len == -1) {
+		if (errno != EAGAIN && errno != EINTR)
+			usbi_err(NULL, "error receiving message from netlink (%d)", errno);
+		return -1;
+	}
+
+	if (len < 32 || (msg.msg_flags & MSG_TRUNC)) {
+		usbi_err(NULL, "invalid netlink message length");
+		return -1;
+	}
+
+	if (sa_nl.nl_groups != NL_GROUP_KERNEL || sa_nl.nl_pid != 0) {
+		usbi_dbg("ignoring netlink message from unknown group/PID (%u/%u)",
+			 (unsigned int)sa_nl.nl_groups, (unsigned int)sa_nl.nl_pid);
+		return -1;
+	}
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) {
+		usbi_dbg("ignoring netlink message with no sender credentials");
+		return -1;
+	}
+
+	cred = (struct ucred *)CMSG_DATA(cmsg);
+	if (cred->uid != 0) {
+		usbi_dbg("ignoring netlink message with non-zero sender UID %u", (unsigned int)cred->uid);
+		return -1;
+	}
+
+	r = linux_netlink_parse(msg_buffer, (size_t)len, &detached, &sys_name, &busnum, &devaddr);
+	if (r)
+		return r;
+
+	usbi_dbg("netlink hotplug found device busnum: %hhu, devaddr: %hhu, sys_name: %s, removed: %s",
+		 busnum, devaddr, sys_name, detached ? "yes" : "no");
+
+	/* signal device is available (or not) to all contexts */
+	if (detached)
+		linux_device_disconnected(busnum, devaddr);
+	else
+		linux_hotplug_enumerate(busnum, devaddr, sys_name);
+
+	return 0;
+}
+
+static void *linux_netlink_event_thread_main(void *arg)
+{
+	char dummy;
+	ssize_t r;
+	struct pollfd fds[] = {
+		{ .fd = netlink_control_pipe[0],
+		  .events = POLLIN },
+		{ .fd = linux_netlink_socket,
+		  .events = POLLIN },
+	};
+
+	UNUSED(arg);
+
+	usbi_dbg("netlink event thread entering");
+
+	while (poll(fds, 2, -1) >= 0) {
+		if (fds[0].revents & POLLIN) {
+			/* activity on control pipe, read the byte and exit */
+			r = usbi_read(netlink_control_pipe[0], &dummy, sizeof(dummy));
+			if (r <= 0)
+				usbi_warn(NULL, "netlink control pipe read failed");
+			break;
+		}
+		if (fds[1].revents & POLLIN) {
+			usbi_mutex_static_lock(&linux_hotplug_lock);
+			linux_netlink_read_message();
+			usbi_mutex_static_unlock(&linux_hotplug_lock);
+		}
+	}
+
+	usbi_dbg("netlink event thread exiting");
+
+	return NULL;
+}
+
+void linux_netlink_hotplug_poll(void)
+{
+	int r;
+
+	usbi_mutex_static_lock(&linux_hotplug_lock);
+	do {
+		r = linux_netlink_read_message();
+	} while (r == 0);
+	usbi_mutex_static_unlock(&linux_hotplug_lock);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/linux_udev.c

@@ -0,0 +1,311 @@
+/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
+/*
+ * Linux usbfs backend for libusb
+ * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
+ * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
+ * Copyright (c) 2012-2013 Nathan Hjelm <hjelmn@mac.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <libudev.h>
+
+#include "libusbi.h"
+#include "linux_usbfs.h"
+
+/* udev context */
+static struct udev *udev_ctx = NULL;
+static int udev_monitor_fd = -1;
+static int udev_control_pipe[2] = {-1, -1};
+static struct udev_monitor *udev_monitor = NULL;
+static pthread_t linux_event_thread;
+
+static void udev_hotplug_event(struct udev_device* udev_dev);
+static void *linux_udev_event_thread_main(void *arg);
+
+int linux_udev_start_event_monitor(void)
+{
+	int r;
+
+	assert(udev_ctx == NULL);
+	udev_ctx = udev_new();
+	if (!udev_ctx) {
+		usbi_err(NULL, "could not create udev context");
+		goto err;
+	}
+
+	udev_monitor = udev_monitor_new_from_netlink(udev_ctx, "udev");
+	if (!udev_monitor) {
+		usbi_err(NULL, "could not initialize udev monitor");
+		goto err_free_ctx;
+	}
+
+	r = udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", "usb_device");
+	if (r) {
+		usbi_err(NULL, "could not initialize udev monitor filter for \"usb\" subsystem");
+		goto err_free_monitor;
+	}
+
+	if (udev_monitor_enable_receiving(udev_monitor)) {
+		usbi_err(NULL, "failed to enable the udev monitor");
+		goto err_free_monitor;
+	}
+
+	udev_monitor_fd = udev_monitor_get_fd(udev_monitor);
+
+	/* Some older versions of udev are not non-blocking by default,
+	 * so make sure this is set */
+	r = fcntl(udev_monitor_fd, F_GETFL);
+	if (r == -1) {
+		usbi_err(NULL, "getting udev monitor fd flags (%d)", errno);
+		goto err_free_monitor;
+	}
+	r = fcntl(udev_monitor_fd, F_SETFL, r | O_NONBLOCK);
+	if (r) {
+		usbi_err(NULL, "setting udev monitor fd flags (%d)", errno);
+		goto err_free_monitor;
+	}
+
+	r = usbi_pipe(udev_control_pipe);
+	if (r) {
+		usbi_err(NULL, "could not create udev control pipe");
+		goto err_free_monitor;
+	}
+
+	r = pthread_create(&linux_event_thread, NULL, linux_udev_event_thread_main, NULL);
+	if (r) {
+		usbi_err(NULL, "creating hotplug event thread (%d)", r);
+		goto err_close_pipe;
+	}
+
+	return LIBUSB_SUCCESS;
+
+err_close_pipe:
+	close(udev_control_pipe[0]);
+	close(udev_control_pipe[1]);
+err_free_monitor:
+	udev_monitor_unref(udev_monitor);
+	udev_monitor = NULL;
+	udev_monitor_fd = -1;
+err_free_ctx:
+	udev_unref(udev_ctx);
+err:
+	udev_ctx = NULL;
+	return LIBUSB_ERROR_OTHER;
+}
+
+int linux_udev_stop_event_monitor(void)
+{
+	char dummy = 1;
+	int r;
+
+	assert(udev_ctx != NULL);
+	assert(udev_monitor != NULL);
+	assert(udev_monitor_fd != -1);
+
+	/* Write some dummy data to the control pipe and
+	 * wait for the thread to exit */
+	r = usbi_write(udev_control_pipe[1], &dummy, sizeof(dummy));
+	if (r <= 0) {
+		usbi_warn(NULL, "udev control pipe signal failed");
+	}
+	pthread_join(linux_event_thread, NULL);
+
+	/* Release the udev monitor */
+	udev_monitor_unref(udev_monitor);
+	udev_monitor = NULL;
+	udev_monitor_fd = -1;
+
+	/* Clean up the udev context */
+	udev_unref(udev_ctx);
+	udev_ctx = NULL;
+
+	/* close and reset control pipe */
+	close(udev_control_pipe[0]);
+	close(udev_control_pipe[1]);
+	udev_control_pipe[0] = -1;
+	udev_control_pipe[1] = -1;
+
+	return LIBUSB_SUCCESS;
+}
+
+static void *linux_udev_event_thread_main(void *arg)
+{
+	char dummy;
+	int r;
+	struct udev_device* udev_dev;
+	struct pollfd fds[] = {
+		{.fd = udev_control_pipe[0],
+		 .events = POLLIN},
+		{.fd = udev_monitor_fd,
+		 .events = POLLIN},
+	};
+
+	usbi_dbg("udev event thread entering.");
+
+	while ((r = poll(fds, 2, -1)) >= 0 || errno == EINTR) {
+		if (r < 0) {
+			/* temporary failure */
+			continue;
+		}
+		if (fds[0].revents & POLLIN) {
+			/* activity on control pipe, read the byte and exit */
+			r = usbi_read(udev_control_pipe[0], &dummy, sizeof(dummy));
+			if (r <= 0) {
+				usbi_warn(NULL, "udev control pipe read failed");
+			}
+			break;
+		}
+		if (fds[1].revents & POLLIN) {
+			usbi_mutex_static_lock(&linux_hotplug_lock);
+			udev_dev = udev_monitor_receive_device(udev_monitor);
+			if (udev_dev)
+				udev_hotplug_event(udev_dev);
+			usbi_mutex_static_unlock(&linux_hotplug_lock);
+		}
+	}
+
+	usbi_dbg("udev event thread exiting");
+
+	return NULL;
+}
+
+static int udev_device_info(struct libusb_context *ctx, int detached,
+			    struct udev_device *udev_dev, uint8_t *busnum,
+			    uint8_t *devaddr, const char **sys_name) {
+	const char *dev_node;
+
+	dev_node = udev_device_get_devnode(udev_dev);
+	if (!dev_node) {
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	*sys_name = udev_device_get_sysname(udev_dev);
+	if (!*sys_name) {
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	return linux_get_device_address(ctx, detached, busnum, devaddr,
+					dev_node, *sys_name);
+}
+
+static void udev_hotplug_event(struct udev_device* udev_dev)
+{
+	const char* udev_action;
+	const char* sys_name = NULL;
+	uint8_t busnum = 0, devaddr = 0;
+	int detached;
+	int r;
+
+	do {
+		udev_action = udev_device_get_action(udev_dev);
+		if (!udev_action) {
+			break;
+		}
+
+		detached = !strncmp(udev_action, "remove", 6);
+
+		r = udev_device_info(NULL, detached, udev_dev, &busnum, &devaddr, &sys_name);
+		if (LIBUSB_SUCCESS != r) {
+			break;
+		}
+
+		usbi_dbg("udev hotplug event. action: %s.", udev_action);
+
+		if (strncmp(udev_action, "add", 3) == 0) {
+			linux_hotplug_enumerate(busnum, devaddr, sys_name);
+		} else if (detached) {
+			linux_device_disconnected(busnum, devaddr);
+		} else {
+			usbi_err(NULL, "ignoring udev action %s", udev_action);
+		}
+	} while (0);
+
+	udev_device_unref(udev_dev);
+}
+
+int linux_udev_scan_devices(struct libusb_context *ctx)
+{
+	struct udev_enumerate *enumerator;
+	struct udev_list_entry *devices, *entry;
+	struct udev_device *udev_dev;
+	const char *sys_name;
+	int r;
+
+	assert(udev_ctx != NULL);
+
+	enumerator = udev_enumerate_new(udev_ctx);
+	if (NULL == enumerator) {
+		usbi_err(ctx, "error creating udev enumerator");
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	udev_enumerate_add_match_subsystem(enumerator, "usb");
+	udev_enumerate_add_match_property(enumerator, "DEVTYPE", "usb_device");
+	udev_enumerate_scan_devices(enumerator);
+	devices = udev_enumerate_get_list_entry(enumerator);
+
+	udev_list_entry_foreach(entry, devices) {
+		const char *path = udev_list_entry_get_name(entry);
+		uint8_t busnum = 0, devaddr = 0;
+
+		udev_dev = udev_device_new_from_syspath(udev_ctx, path);
+
+		r = udev_device_info(ctx, 0, udev_dev, &busnum, &devaddr, &sys_name);
+		if (r) {
+			udev_device_unref(udev_dev);
+			continue;
+		}
+
+		linux_enumerate_device(ctx, busnum, devaddr, sys_name);
+		udev_device_unref(udev_dev);
+	}
+
+	udev_enumerate_unref(enumerator);
+
+	return LIBUSB_SUCCESS;
+}
+
+void linux_udev_hotplug_poll(void)
+{
+	struct udev_device* udev_dev;
+
+	usbi_mutex_static_lock(&linux_hotplug_lock);
+	do {
+		udev_dev = udev_monitor_receive_device(udev_monitor);
+		if (udev_dev) {
+			usbi_dbg("Handling hotplug event from hotplug_poll");
+			udev_hotplug_event(udev_dev);
+		}
+	} while (udev_dev);
+	usbi_mutex_static_unlock(&linux_hotplug_lock);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/linux_usbfs.h

@@ -0,0 +1,193 @@
+/*
+ * usbfs header structures
+ * Copyright © 2007 Daniel Drake <dsd@gentoo.org>
+ * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LIBUSB_USBFS_H
+#define LIBUSB_USBFS_H
+
+#include <linux/types.h>
+
+#define SYSFS_DEVICE_PATH "/sys/bus/usb/devices"
+
+struct usbfs_ctrltransfer {
+	/* keep in sync with usbdevice_fs.h:usbdevfs_ctrltransfer */
+	uint8_t  bmRequestType;
+	uint8_t  bRequest;
+	uint16_t wValue;
+	uint16_t wIndex;
+	uint16_t wLength;
+
+	uint32_t timeout;	/* in milliseconds */
+
+	/* pointer to data */
+	void *data;
+};
+
+struct usbfs_bulktransfer {
+	/* keep in sync with usbdevice_fs.h:usbdevfs_bulktransfer */
+	unsigned int ep;
+	unsigned int len;
+	unsigned int timeout;	/* in milliseconds */
+
+	/* pointer to data */
+	void *data;
+};
+
+struct usbfs_setinterface {
+	/* keep in sync with usbdevice_fs.h:usbdevfs_setinterface */
+	unsigned int interface;
+	unsigned int altsetting;
+};
+
+#define USBFS_MAXDRIVERNAME 255
+
+struct usbfs_getdriver {
+	unsigned int interface;
+	char driver[USBFS_MAXDRIVERNAME + 1];
+};
+
+#define USBFS_URB_SHORT_NOT_OK		0x01
+#define USBFS_URB_ISO_ASAP			0x02
+#define USBFS_URB_BULK_CONTINUATION	0x04
+#define USBFS_URB_QUEUE_BULK		0x10
+#define USBFS_URB_ZERO_PACKET		0x40
+
+enum usbfs_urb_type {
+	USBFS_URB_TYPE_ISO = 0,
+	USBFS_URB_TYPE_INTERRUPT = 1,
+	USBFS_URB_TYPE_CONTROL = 2,
+	USBFS_URB_TYPE_BULK = 3,
+};
+
+struct usbfs_iso_packet_desc {
+	unsigned int length;
+	unsigned int actual_length;
+	unsigned int status;
+};
+
+#define MAX_ISO_BUFFER_LENGTH		49152 * 128
+#define MAX_BULK_BUFFER_LENGTH		16384
+#define MAX_CTRL_BUFFER_LENGTH		4096
+
+struct usbfs_urb {
+	unsigned char type;
+	unsigned char endpoint;
+	int status;
+	unsigned int flags;
+	void *buffer;
+	int buffer_length;
+	int actual_length;
+	int start_frame;
+	union {
+		int number_of_packets;	/* Only used for isoc urbs */
+		unsigned int stream_id;	/* Only used with bulk streams */
+	};
+	int error_count;
+	unsigned int signr;
+	void *usercontext;
+	struct usbfs_iso_packet_desc iso_frame_desc[0];
+};
+
+struct usbfs_connectinfo {
+	unsigned int devnum;
+	unsigned char slow;
+};
+
+struct usbfs_ioctl {
+	int ifno;	/* interface 0..N ; negative numbers reserved */
+	int ioctl_code;	/* MUST encode size + direction of data so the
+			 * macros in <asm/ioctl.h> give correct values */
+	void *data;	/* param buffer (in, or out) */
+};
+
+struct usbfs_hub_portinfo {
+	unsigned char numports;
+	unsigned char port[127];	/* port to device num mapping */
+};
+
+#define USBFS_CAP_ZERO_PACKET		0x01
+#define USBFS_CAP_BULK_CONTINUATION	0x02
+#define USBFS_CAP_NO_PACKET_SIZE_LIM	0x04
+#define USBFS_CAP_BULK_SCATTER_GATHER	0x08
+#define USBFS_CAP_REAP_AFTER_DISCONNECT	0x10
+
+#define USBFS_DISCONNECT_CLAIM_IF_DRIVER	0x01
+#define USBFS_DISCONNECT_CLAIM_EXCEPT_DRIVER	0x02
+
+struct usbfs_disconnect_claim {
+	unsigned int interface;
+	unsigned int flags;
+	char driver[USBFS_MAXDRIVERNAME + 1];
+};
+
+struct usbfs_streams {
+	unsigned int num_streams; /* Not used by USBDEVFS_FREE_STREAMS */
+	unsigned int num_eps;
+	unsigned char eps[0];
+};
+
+#define IOCTL_USBFS_CONTROL	_IOWR('U', 0, struct usbfs_ctrltransfer)
+#define IOCTL_USBFS_BULK		_IOWR('U', 2, struct usbfs_bulktransfer)
+#define IOCTL_USBFS_RESETEP	_IOR('U', 3, unsigned int)
+#define IOCTL_USBFS_SETINTF	_IOR('U', 4, struct usbfs_setinterface)
+#define IOCTL_USBFS_SETCONFIG	_IOR('U', 5, unsigned int)
+#define IOCTL_USBFS_GETDRIVER	_IOW('U', 8, struct usbfs_getdriver)
+#define IOCTL_USBFS_SUBMITURB	_IOR('U', 10, struct usbfs_urb)
+#define IOCTL_USBFS_DISCARDURB	_IO('U', 11)
+#define IOCTL_USBFS_REAPURB	_IOW('U', 12, void *)
+#define IOCTL_USBFS_REAPURBNDELAY	_IOW('U', 13, void *)
+#define IOCTL_USBFS_CLAIMINTF	_IOR('U', 15, unsigned int)
+#define IOCTL_USBFS_RELEASEINTF	_IOR('U', 16, unsigned int)
+#define IOCTL_USBFS_CONNECTINFO	_IOW('U', 17, struct usbfs_connectinfo)
+#define IOCTL_USBFS_IOCTL         _IOWR('U', 18, struct usbfs_ioctl)
+#define IOCTL_USBFS_HUB_PORTINFO	_IOR('U', 19, struct usbfs_hub_portinfo)
+#define IOCTL_USBFS_RESET		_IO('U', 20)
+#define IOCTL_USBFS_CLEAR_HALT	_IOR('U', 21, unsigned int)
+#define IOCTL_USBFS_DISCONNECT	_IO('U', 22)
+#define IOCTL_USBFS_CONNECT	_IO('U', 23)
+#define IOCTL_USBFS_CLAIM_PORT	_IOR('U', 24, unsigned int)
+#define IOCTL_USBFS_RELEASE_PORT	_IOR('U', 25, unsigned int)
+#define IOCTL_USBFS_GET_CAPABILITIES	_IOR('U', 26, __u32)
+#define IOCTL_USBFS_DISCONNECT_CLAIM	_IOR('U', 27, struct usbfs_disconnect_claim)
+#define IOCTL_USBFS_ALLOC_STREAMS	_IOR('U', 28, struct usbfs_streams)
+#define IOCTL_USBFS_FREE_STREAMS	_IOR('U', 29, struct usbfs_streams)
+
+extern usbi_mutex_static_t linux_hotplug_lock;
+
+#if defined(HAVE_LIBUDEV)
+int linux_udev_start_event_monitor(void);
+int linux_udev_stop_event_monitor(void);
+int linux_udev_scan_devices(struct libusb_context *ctx);
+void linux_udev_hotplug_poll(void);
+#else
+int linux_netlink_start_event_monitor(void);
+int linux_netlink_stop_event_monitor(void);
+void linux_netlink_hotplug_poll(void);
+#endif
+
+void linux_hotplug_enumerate(uint8_t busnum, uint8_t devaddr, const char *sys_name);
+void linux_device_disconnected(uint8_t busnum, uint8_t devaddr);
+
+int linux_get_device_address (struct libusb_context *ctx, int detached,
+	uint8_t *busnum, uint8_t *devaddr, const char *dev_node,
+	const char *sys_name);
+int linux_enumerate_device(struct libusb_context *ctx,
+	uint8_t busnum, uint8_t devaddr, const char *sysfs_dir);
+
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/netbsd_usb.c

@@ -0,0 +1,677 @@
+/*
+ * Copyright © 2011 Martin Pieuchot <mpi@openbsd.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <dev/usb/usb.h>
+
+#include "libusbi.h"
+
+struct device_priv {
+	char devnode[16];
+	int fd;
+
+	unsigned char *cdesc;			/* active config descriptor */
+	usb_device_descriptor_t ddesc;		/* usb device descriptor */
+};
+
+struct handle_priv {
+	int endpoints[USB_MAX_ENDPOINTS];
+};
+
+/*
+ * Backend functions
+ */
+static int netbsd_get_device_list(struct libusb_context *,
+    struct discovered_devs **);
+static int netbsd_open(struct libusb_device_handle *);
+static void netbsd_close(struct libusb_device_handle *);
+
+static int netbsd_get_device_descriptor(struct libusb_device *, unsigned char *,
+    int *);
+static int netbsd_get_active_config_descriptor(struct libusb_device *,
+    unsigned char *, size_t, int *);
+static int netbsd_get_config_descriptor(struct libusb_device *, uint8_t,
+    unsigned char *, size_t, int *);
+
+static int netbsd_get_configuration(struct libusb_device_handle *, int *);
+static int netbsd_set_configuration(struct libusb_device_handle *, int);
+
+static int netbsd_claim_interface(struct libusb_device_handle *, int);
+static int netbsd_release_interface(struct libusb_device_handle *, int);
+
+static int netbsd_set_interface_altsetting(struct libusb_device_handle *, int,
+    int);
+static int netbsd_clear_halt(struct libusb_device_handle *, unsigned char);
+static int netbsd_reset_device(struct libusb_device_handle *);
+static void netbsd_destroy_device(struct libusb_device *);
+
+static int netbsd_submit_transfer(struct usbi_transfer *);
+static int netbsd_cancel_transfer(struct usbi_transfer *);
+static void netbsd_clear_transfer_priv(struct usbi_transfer *);
+static int netbsd_handle_transfer_completion(struct usbi_transfer *);
+static int netbsd_clock_gettime(int, struct timespec *);
+
+/*
+ * Private functions
+ */
+static int _errno_to_libusb(int);
+static int _cache_active_config_descriptor(struct libusb_device *, int);
+static int _sync_control_transfer(struct usbi_transfer *);
+static int _sync_gen_transfer(struct usbi_transfer *);
+static int _access_endpoint(struct libusb_transfer *);
+
+const struct usbi_os_backend netbsd_backend = {
+	"Synchronous NetBSD backend",
+	0,
+	NULL,				/* init() */
+	NULL,				/* exit() */
+	netbsd_get_device_list,
+	NULL,				/* hotplug_poll */
+	netbsd_open,
+	netbsd_close,
+
+	netbsd_get_device_descriptor,
+	netbsd_get_active_config_descriptor,
+	netbsd_get_config_descriptor,
+	NULL,				/* get_config_descriptor_by_value() */
+
+	netbsd_get_configuration,
+	netbsd_set_configuration,
+
+	netbsd_claim_interface,
+	netbsd_release_interface,
+
+	netbsd_set_interface_altsetting,
+	netbsd_clear_halt,
+	netbsd_reset_device,
+
+	NULL,				/* alloc_streams */
+	NULL,				/* free_streams */
+
+	NULL,				/* dev_mem_alloc() */
+	NULL,				/* dev_mem_free() */
+
+	NULL,				/* kernel_driver_active() */
+	NULL,				/* detach_kernel_driver() */
+	NULL,				/* attach_kernel_driver() */
+
+	netbsd_destroy_device,
+
+	netbsd_submit_transfer,
+	netbsd_cancel_transfer,
+	netbsd_clear_transfer_priv,
+
+	NULL,				/* handle_events() */
+	netbsd_handle_transfer_completion,
+
+	netbsd_clock_gettime,
+	sizeof(struct device_priv),
+	sizeof(struct handle_priv),
+	0,				/* transfer_priv_size */
+};
+
+int
+netbsd_get_device_list(struct libusb_context * ctx,
+	struct discovered_devs **discdevs)
+{
+	struct libusb_device *dev;
+	struct device_priv *dpriv;
+	struct usb_device_info di;
+	unsigned long session_id;
+	char devnode[16];
+	int fd, err, i;
+
+	usbi_dbg("");
+
+	/* Only ugen(4) is supported */
+	for (i = 0; i < USB_MAX_DEVICES; i++) {
+		/* Control endpoint is always .00 */
+		snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
+
+		if ((fd = open(devnode, O_RDONLY)) < 0) {
+			if (errno != ENOENT && errno != ENXIO)
+				usbi_err(ctx, "could not open %s", devnode);
+			continue;
+		}
+
+		if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
+			continue;
+
+		session_id = (di.udi_bus << 8 | di.udi_addr);
+		dev = usbi_get_device_by_session_id(ctx, session_id);
+
+		if (dev == NULL) {
+			dev = usbi_alloc_device(ctx, session_id);
+			if (dev == NULL)
+				return (LIBUSB_ERROR_NO_MEM);
+
+			dev->bus_number = di.udi_bus;
+			dev->device_address = di.udi_addr;
+			dev->speed = di.udi_speed;
+
+			dpriv = (struct device_priv *)dev->os_priv;
+			strlcpy(dpriv->devnode, devnode, sizeof(devnode));
+			dpriv->fd = -1;
+
+			if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
+				err = errno;
+				goto error;
+			}
+
+			dpriv->cdesc = NULL;
+			if (_cache_active_config_descriptor(dev, fd)) {
+				err = errno;
+				goto error;
+			}
+
+			if ((err = usbi_sanitize_device(dev)))
+				goto error;
+		}
+		close(fd);
+
+		if (discovered_devs_append(*discdevs, dev) == NULL)
+			return (LIBUSB_ERROR_NO_MEM);
+
+		libusb_unref_device(dev);
+	}
+
+	return (LIBUSB_SUCCESS);
+
+error:
+	close(fd);
+	libusb_unref_device(dev);
+	return _errno_to_libusb(err);
+}
+
+int
+netbsd_open(struct libusb_device_handle *handle)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	dpriv->fd = open(dpriv->devnode, O_RDWR);
+	if (dpriv->fd < 0) {
+		dpriv->fd = open(dpriv->devnode, O_RDONLY);
+		if (dpriv->fd < 0)
+			return _errno_to_libusb(errno);
+	}
+
+	usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
+
+	return (LIBUSB_SUCCESS);
+}
+
+void
+netbsd_close(struct libusb_device_handle *handle)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	usbi_dbg("close: fd %d", dpriv->fd);
+
+	close(dpriv->fd);
+	dpriv->fd = -1;
+}
+
+int
+netbsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
+    int *host_endian)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+
+	usbi_dbg("");
+
+	memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
+
+	*host_endian = 0;
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_get_active_config_descriptor(struct libusb_device *dev,
+    unsigned char *buf, size_t len, int *host_endian)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+	usb_config_descriptor_t *ucd;
+
+	ucd = (usb_config_descriptor_t *) dpriv->cdesc;
+	len = MIN(len, UGETW(ucd->wTotalLength));
+
+	usbi_dbg("len %d", len);
+
+	memcpy(buf, dpriv->cdesc, len);
+
+	*host_endian = 0;
+
+	return len;
+}
+
+int
+netbsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
+    unsigned char *buf, size_t len, int *host_endian)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+	struct usb_full_desc ufd;
+	int fd, err;
+
+	usbi_dbg("index %d, len %d", idx, len);
+
+	/* A config descriptor may be requested before opening the device */
+	if (dpriv->fd >= 0) {
+		fd = dpriv->fd;
+	} else {
+		fd = open(dpriv->devnode, O_RDONLY);
+		if (fd < 0)
+			return _errno_to_libusb(errno);
+	}
+
+	ufd.ufd_config_index = idx;
+	ufd.ufd_size = len;
+	ufd.ufd_data = buf;
+
+	if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
+		err = errno;
+		if (dpriv->fd < 0)
+			close(fd);
+		return _errno_to_libusb(err);
+	}
+
+	if (dpriv->fd < 0)
+		close(fd);
+
+	*host_endian = 0;
+
+	return len;
+}
+
+int
+netbsd_get_configuration(struct libusb_device_handle *handle, int *config)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	usbi_dbg("");
+
+	if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
+		return _errno_to_libusb(errno);
+
+	usbi_dbg("configuration %d", *config);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_set_configuration(struct libusb_device_handle *handle, int config)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	usbi_dbg("configuration %d", config);
+
+	if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
+		return _errno_to_libusb(errno);
+
+	return _cache_active_config_descriptor(handle->dev, dpriv->fd);
+}
+
+int
+netbsd_claim_interface(struct libusb_device_handle *handle, int iface)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	int i;
+
+	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
+		hpriv->endpoints[i] = -1;
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_release_interface(struct libusb_device_handle *handle, int iface)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	int i;
+
+	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
+		if (hpriv->endpoints[i] >= 0)
+			close(hpriv->endpoints[i]);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
+    int altsetting)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+	struct usb_alt_interface intf;
+
+	usbi_dbg("iface %d, setting %d", iface, altsetting);
+
+	memset(&intf, 0, sizeof(intf));
+
+	intf.uai_interface_index = iface;
+	intf.uai_alt_no = altsetting;
+
+	if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
+		return _errno_to_libusb(errno);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+	struct usb_ctl_request req;
+
+	usbi_dbg("");
+
+	req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
+	req.ucr_request.bRequest = UR_CLEAR_FEATURE;
+	USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
+	USETW(req.ucr_request.wIndex, endpoint);
+	USETW(req.ucr_request.wLength, 0);
+
+	if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
+		return _errno_to_libusb(errno);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_reset_device(struct libusb_device_handle *handle)
+{
+	usbi_dbg("");
+
+	return (LIBUSB_ERROR_NOT_SUPPORTED);
+}
+
+void
+netbsd_destroy_device(struct libusb_device *dev)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+
+	usbi_dbg("");
+
+	free(dpriv->cdesc);
+}
+
+int
+netbsd_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	struct handle_priv *hpriv;
+	int err = 0;
+
+	usbi_dbg("");
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+		err = _sync_control_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		if (IS_XFEROUT(transfer)) {
+			/* Isochronous write is not supported */
+			err = LIBUSB_ERROR_NOT_SUPPORTED;
+			break;
+		}
+		err = _sync_gen_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		if (IS_XFEROUT(transfer) &&
+		    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
+			err = LIBUSB_ERROR_NOT_SUPPORTED;
+			break;
+		}
+		err = _sync_gen_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
+		err = LIBUSB_ERROR_NOT_SUPPORTED;
+		break;
+	}
+
+	if (err)
+		return (err);
+
+	usbi_signal_transfer_completion(itransfer);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+netbsd_cancel_transfer(struct usbi_transfer *itransfer)
+{
+	usbi_dbg("");
+
+	return (LIBUSB_ERROR_NOT_SUPPORTED);
+}
+
+void
+netbsd_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	usbi_dbg("");
+
+	/* Nothing to do */
+}
+
+int
+netbsd_handle_transfer_completion(struct usbi_transfer *itransfer)
+{
+	return usbi_handle_transfer_completion(itransfer, LIBUSB_TRANSFER_COMPLETED);
+}
+
+int
+netbsd_clock_gettime(int clkid, struct timespec *tp)
+{
+	usbi_dbg("clock %d", clkid);
+
+	if (clkid == USBI_CLOCK_REALTIME)
+		return clock_gettime(CLOCK_REALTIME, tp);
+
+	if (clkid == USBI_CLOCK_MONOTONIC)
+		return clock_gettime(CLOCK_MONOTONIC, tp);
+
+	return (LIBUSB_ERROR_INVALID_PARAM);
+}
+
+int
+_errno_to_libusb(int err)
+{
+	switch (err) {
+	case EIO:
+		return (LIBUSB_ERROR_IO);
+	case EACCES:
+		return (LIBUSB_ERROR_ACCESS);
+	case ENOENT:
+		return (LIBUSB_ERROR_NO_DEVICE);
+	case ENOMEM:
+		return (LIBUSB_ERROR_NO_MEM);
+	}
+
+	usbi_dbg("error: %s", strerror(err));
+
+	return (LIBUSB_ERROR_OTHER);
+}
+
+int
+_cache_active_config_descriptor(struct libusb_device *dev, int fd)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+	struct usb_config_desc ucd;
+	struct usb_full_desc ufd;
+	unsigned char* buf;
+	int len;
+
+	usbi_dbg("fd %d", fd);
+
+	ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
+
+	if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
+		return _errno_to_libusb(errno);
+
+	usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
+
+	len = UGETW(ucd.ucd_desc.wTotalLength);
+	buf = malloc(len);
+	if (buf == NULL)
+		return (LIBUSB_ERROR_NO_MEM);
+
+	ufd.ufd_config_index = ucd.ucd_config_index;
+	ufd.ufd_size = len;
+	ufd.ufd_data = buf;
+
+	usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
+
+	if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
+		free(buf);
+		return _errno_to_libusb(errno);
+	}
+
+	if (dpriv->cdesc)
+		free(dpriv->cdesc);
+	dpriv->cdesc = buf;
+
+	return (0);
+}
+
+int
+_sync_control_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	struct libusb_control_setup *setup;
+	struct device_priv *dpriv;
+	struct usb_ctl_request req;
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
+	setup = (struct libusb_control_setup *)transfer->buffer;
+
+	usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
+	    setup->bmRequestType, setup->bRequest,
+	    libusb_le16_to_cpu(setup->wValue),
+	    libusb_le16_to_cpu(setup->wIndex),
+	    libusb_le16_to_cpu(setup->wLength), transfer->timeout);
+
+	req.ucr_request.bmRequestType = setup->bmRequestType;
+	req.ucr_request.bRequest = setup->bRequest;
+	/* Don't use USETW, libusb already deals with the endianness */
+	(*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
+	(*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
+	(*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
+	req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
+
+	if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
+		req.ucr_flags = USBD_SHORT_XFER_OK;
+
+	if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
+		return _errno_to_libusb(errno);
+
+	if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
+		return _errno_to_libusb(errno);
+
+	itransfer->transferred = req.ucr_actlen;
+
+	usbi_dbg("transferred %d", itransfer->transferred);
+
+	return (0);
+}
+
+int
+_access_endpoint(struct libusb_transfer *transfer)
+{
+	struct handle_priv *hpriv;
+	struct device_priv *dpriv;
+	char *s, devnode[16];
+	int fd, endpt;
+	mode_t mode;
+
+	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
+	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
+
+	endpt = UE_GET_ADDR(transfer->endpoint);
+	mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
+
+	usbi_dbg("endpoint %d mode %d", endpt, mode);
+
+	if (hpriv->endpoints[endpt] < 0) {
+		/* Pick the right node given the control one */
+		strlcpy(devnode, dpriv->devnode, sizeof(devnode));
+		s = strchr(devnode, '.');
+		snprintf(s, 4, ".%02d", endpt);
+
+		/* We may need to read/write to the same endpoint later. */
+		if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
+			if ((fd = open(devnode, mode)) < 0)
+				return (-1);
+
+		hpriv->endpoints[endpt] = fd;
+	}
+
+	return (hpriv->endpoints[endpt]);
+}
+
+int
+_sync_gen_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	int fd, nr = 1;
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	/*
+	 * Bulk, Interrupt or Isochronous transfer depends on the
+	 * endpoint and thus the node to open.
+	 */
+	if ((fd = _access_endpoint(transfer)) < 0)
+		return _errno_to_libusb(errno);
+
+	if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
+		return _errno_to_libusb(errno);
+
+	if (IS_XFERIN(transfer)) {
+		if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
+			if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
+				return _errno_to_libusb(errno);
+
+		nr = read(fd, transfer->buffer, transfer->length);
+	} else {
+		nr = write(fd, transfer->buffer, transfer->length);
+	}
+
+	if (nr < 0)
+		return _errno_to_libusb(errno);
+
+	itransfer->transferred = nr;
+
+	return (0);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/openbsd_usb.c

@@ -0,0 +1,771 @@
+/*
+ * Copyright © 2011-2013 Martin Pieuchot <mpi@openbsd.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <dev/usb/usb.h>
+
+#include "libusbi.h"
+
+struct device_priv {
+	char *devname;				/* name of the ugen(4) node */
+	int fd;					/* device file descriptor */
+
+	unsigned char *cdesc;			/* active config descriptor */
+	usb_device_descriptor_t ddesc;		/* usb device descriptor */
+};
+
+struct handle_priv {
+	int endpoints[USB_MAX_ENDPOINTS];
+};
+
+/*
+ * Backend functions
+ */
+static int obsd_get_device_list(struct libusb_context *,
+    struct discovered_devs **);
+static int obsd_open(struct libusb_device_handle *);
+static void obsd_close(struct libusb_device_handle *);
+
+static int obsd_get_device_descriptor(struct libusb_device *, unsigned char *,
+    int *);
+static int obsd_get_active_config_descriptor(struct libusb_device *,
+    unsigned char *, size_t, int *);
+static int obsd_get_config_descriptor(struct libusb_device *, uint8_t,
+    unsigned char *, size_t, int *);
+
+static int obsd_get_configuration(struct libusb_device_handle *, int *);
+static int obsd_set_configuration(struct libusb_device_handle *, int);
+
+static int obsd_claim_interface(struct libusb_device_handle *, int);
+static int obsd_release_interface(struct libusb_device_handle *, int);
+
+static int obsd_set_interface_altsetting(struct libusb_device_handle *, int,
+    int);
+static int obsd_clear_halt(struct libusb_device_handle *, unsigned char);
+static int obsd_reset_device(struct libusb_device_handle *);
+static void obsd_destroy_device(struct libusb_device *);
+
+static int obsd_submit_transfer(struct usbi_transfer *);
+static int obsd_cancel_transfer(struct usbi_transfer *);
+static void obsd_clear_transfer_priv(struct usbi_transfer *);
+static int obsd_handle_transfer_completion(struct usbi_transfer *);
+static int obsd_clock_gettime(int, struct timespec *);
+
+/*
+ * Private functions
+ */
+static int _errno_to_libusb(int);
+static int _cache_active_config_descriptor(struct libusb_device *);
+static int _sync_control_transfer(struct usbi_transfer *);
+static int _sync_gen_transfer(struct usbi_transfer *);
+static int _access_endpoint(struct libusb_transfer *);
+
+static int _bus_open(int);
+
+
+const struct usbi_os_backend openbsd_backend = {
+	"Synchronous OpenBSD backend",
+	0,
+	NULL,				/* init() */
+	NULL,				/* exit() */
+	obsd_get_device_list,
+	NULL,				/* hotplug_poll */
+	obsd_open,
+	obsd_close,
+
+	obsd_get_device_descriptor,
+	obsd_get_active_config_descriptor,
+	obsd_get_config_descriptor,
+	NULL,				/* get_config_descriptor_by_value() */
+
+	obsd_get_configuration,
+	obsd_set_configuration,
+
+	obsd_claim_interface,
+	obsd_release_interface,
+
+	obsd_set_interface_altsetting,
+	obsd_clear_halt,
+	obsd_reset_device,
+
+	NULL,				/* alloc_streams */
+	NULL,				/* free_streams */
+
+	NULL,				/* dev_mem_alloc() */
+	NULL,				/* dev_mem_free() */
+
+	NULL,				/* kernel_driver_active() */
+	NULL,				/* detach_kernel_driver() */
+	NULL,				/* attach_kernel_driver() */
+
+	obsd_destroy_device,
+
+	obsd_submit_transfer,
+	obsd_cancel_transfer,
+	obsd_clear_transfer_priv,
+
+	NULL,				/* handle_events() */
+	obsd_handle_transfer_completion,
+
+	obsd_clock_gettime,
+	sizeof(struct device_priv),
+	sizeof(struct handle_priv),
+	0,				/* transfer_priv_size */
+};
+
+#define DEVPATH	"/dev/"
+#define USBDEV	DEVPATH "usb"
+
+int
+obsd_get_device_list(struct libusb_context * ctx,
+	struct discovered_devs **discdevs)
+{
+	struct discovered_devs *ddd;
+	struct libusb_device *dev;
+	struct device_priv *dpriv;
+	struct usb_device_info di;
+	struct usb_device_ddesc dd;
+	unsigned long session_id;
+	char devices[USB_MAX_DEVICES];
+	char busnode[16];
+	char *udevname;
+	int fd, addr, i, j;
+
+	usbi_dbg("");
+
+	for (i = 0; i < 8; i++) {
+		snprintf(busnode, sizeof(busnode), USBDEV "%d", i);
+
+		if ((fd = open(busnode, O_RDWR)) < 0) {
+			if (errno != ENOENT && errno != ENXIO)
+				usbi_err(ctx, "could not open %s", busnode);
+			continue;
+		}
+
+		bzero(devices, sizeof(devices));
+		for (addr = 1; addr < USB_MAX_DEVICES; addr++) {
+			if (devices[addr])
+				continue;
+
+			di.udi_addr = addr;
+			if (ioctl(fd, USB_DEVICEINFO, &di) < 0)
+				continue;
+
+			/*
+			 * XXX If ugen(4) is attached to the USB device
+			 * it will be used.
+			 */
+			udevname = NULL;
+			for (j = 0; j < USB_MAX_DEVNAMES; j++)
+				if (!strncmp("ugen", di.udi_devnames[j], 4)) {
+					udevname = strdup(di.udi_devnames[j]);
+					break;
+				}
+
+			session_id = (di.udi_bus << 8 | di.udi_addr);
+			dev = usbi_get_device_by_session_id(ctx, session_id);
+
+			if (dev == NULL) {
+				dev = usbi_alloc_device(ctx, session_id);
+				if (dev == NULL) {
+					close(fd);
+					return (LIBUSB_ERROR_NO_MEM);
+				}
+
+				dev->bus_number = di.udi_bus;
+				dev->device_address = di.udi_addr;
+				dev->speed = di.udi_speed;
+
+				dpriv = (struct device_priv *)dev->os_priv;
+				dpriv->fd = -1;
+				dpriv->cdesc = NULL;
+				dpriv->devname = udevname;
+
+				dd.udd_bus = di.udi_bus;
+				dd.udd_addr = di.udi_addr;
+				if (ioctl(fd, USB_DEVICE_GET_DDESC, &dd) < 0) {
+					libusb_unref_device(dev);
+					continue;
+				}
+				dpriv->ddesc = dd.udd_desc;
+
+				if (_cache_active_config_descriptor(dev)) {
+					libusb_unref_device(dev);
+					continue;
+				}
+
+				if (usbi_sanitize_device(dev)) {
+					libusb_unref_device(dev);
+					continue;
+				}
+			}
+
+			ddd = discovered_devs_append(*discdevs, dev);
+			if (ddd == NULL) {
+				close(fd);
+				return (LIBUSB_ERROR_NO_MEM);
+			}
+			libusb_unref_device(dev);
+
+			*discdevs = ddd;
+			devices[addr] = 1;
+		}
+
+		close(fd);
+	}
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_open(struct libusb_device_handle *handle)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+	char devnode[16];
+
+	if (dpriv->devname) {
+		/*
+		 * Only open ugen(4) attached devices read-write, all
+		 * read-only operations are done through the bus node.
+		 */
+		snprintf(devnode, sizeof(devnode), DEVPATH "%s.00",
+		    dpriv->devname);
+		dpriv->fd = open(devnode, O_RDWR);
+		if (dpriv->fd < 0)
+			return _errno_to_libusb(errno);
+
+		usbi_dbg("open %s: fd %d", devnode, dpriv->fd);
+	}
+
+	return (LIBUSB_SUCCESS);
+}
+
+void
+obsd_close(struct libusb_device_handle *handle)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	if (dpriv->devname) {
+		usbi_dbg("close: fd %d", dpriv->fd);
+
+		close(dpriv->fd);
+		dpriv->fd = -1;
+	}
+}
+
+int
+obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
+    int *host_endian)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+
+	usbi_dbg("");
+
+	memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
+
+	*host_endian = 0;
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_get_active_config_descriptor(struct libusb_device *dev,
+    unsigned char *buf, size_t len, int *host_endian)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+	usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc;
+
+	len = MIN(len, UGETW(ucd->wTotalLength));
+
+	usbi_dbg("len %d", len);
+
+	memcpy(buf, dpriv->cdesc, len);
+
+	*host_endian = 0;
+
+	return (len);
+}
+
+int
+obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
+    unsigned char *buf, size_t len, int *host_endian)
+{
+	struct usb_device_fdesc udf;
+	int fd, err;
+
+	if ((fd = _bus_open(dev->bus_number)) < 0)
+		return _errno_to_libusb(errno);
+
+	udf.udf_bus = dev->bus_number;
+	udf.udf_addr = dev->device_address;
+	udf.udf_config_index = idx;
+	udf.udf_size = len;
+	udf.udf_data = buf;
+
+	usbi_dbg("index %d, len %d", udf.udf_config_index, len);
+
+	if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) {
+		err = errno;
+		close(fd);
+		return _errno_to_libusb(err);
+	}
+	close(fd);
+
+	*host_endian = 0;
+
+	return (len);
+}
+
+int
+obsd_get_configuration(struct libusb_device_handle *handle, int *config)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+	usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc;
+
+	*config = ucd->bConfigurationValue;
+
+	usbi_dbg("bConfigurationValue %d", *config);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_set_configuration(struct libusb_device_handle *handle, int config)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+
+	if (dpriv->devname == NULL)
+		return (LIBUSB_ERROR_NOT_SUPPORTED);
+
+	usbi_dbg("bConfigurationValue %d", config);
+
+	if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
+		return _errno_to_libusb(errno);
+
+	return _cache_active_config_descriptor(handle->dev);
+}
+
+int
+obsd_claim_interface(struct libusb_device_handle *handle, int iface)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	int i;
+
+	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
+		hpriv->endpoints[i] = -1;
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_release_interface(struct libusb_device_handle *handle, int iface)
+{
+	struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
+	int i;
+
+	for (i = 0; i < USB_MAX_ENDPOINTS; i++)
+		if (hpriv->endpoints[i] >= 0)
+			close(hpriv->endpoints[i]);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
+    int altsetting)
+{
+	struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
+	struct usb_alt_interface intf;
+
+	if (dpriv->devname == NULL)
+		return (LIBUSB_ERROR_NOT_SUPPORTED);
+
+	usbi_dbg("iface %d, setting %d", iface, altsetting);
+
+	memset(&intf, 0, sizeof(intf));
+
+	intf.uai_interface_index = iface;
+	intf.uai_alt_no = altsetting;
+
+	if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
+		return _errno_to_libusb(errno);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
+{
+	struct usb_ctl_request req;
+	int fd, err;
+
+	if ((fd = _bus_open(handle->dev->bus_number)) < 0)
+		return _errno_to_libusb(errno);
+
+	usbi_dbg("");
+
+	req.ucr_addr = handle->dev->device_address;
+	req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
+	req.ucr_request.bRequest = UR_CLEAR_FEATURE;
+	USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
+	USETW(req.ucr_request.wIndex, endpoint);
+	USETW(req.ucr_request.wLength, 0);
+
+	if (ioctl(fd, USB_REQUEST, &req) < 0) {
+		err = errno;
+		close(fd);
+		return _errno_to_libusb(err);
+	}
+	close(fd);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_reset_device(struct libusb_device_handle *handle)
+{
+	usbi_dbg("");
+
+	return (LIBUSB_ERROR_NOT_SUPPORTED);
+}
+
+void
+obsd_destroy_device(struct libusb_device *dev)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+
+	usbi_dbg("");
+
+	free(dpriv->cdesc);
+	free(dpriv->devname);
+}
+
+int
+obsd_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	struct handle_priv *hpriv;
+	int err = 0;
+
+	usbi_dbg("");
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+		err = _sync_control_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		if (IS_XFEROUT(transfer)) {
+			/* Isochronous write is not supported */
+			err = LIBUSB_ERROR_NOT_SUPPORTED;
+			break;
+		}
+		err = _sync_gen_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		if (IS_XFEROUT(transfer) &&
+		    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
+			err = LIBUSB_ERROR_NOT_SUPPORTED;
+			break;
+		}
+		err = _sync_gen_transfer(itransfer);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
+		err = LIBUSB_ERROR_NOT_SUPPORTED;
+		break;
+	}
+
+	if (err)
+		return (err);
+
+	usbi_signal_transfer_completion(itransfer);
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+obsd_cancel_transfer(struct usbi_transfer *itransfer)
+{
+	usbi_dbg("");
+
+	return (LIBUSB_ERROR_NOT_SUPPORTED);
+}
+
+void
+obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	usbi_dbg("");
+
+	/* Nothing to do */
+}
+
+int
+obsd_handle_transfer_completion(struct usbi_transfer *itransfer)
+{
+	return usbi_handle_transfer_completion(itransfer, LIBUSB_TRANSFER_COMPLETED);
+}
+
+int
+obsd_clock_gettime(int clkid, struct timespec *tp)
+{
+	usbi_dbg("clock %d", clkid);
+
+	if (clkid == USBI_CLOCK_REALTIME)
+		return clock_gettime(CLOCK_REALTIME, tp);
+
+	if (clkid == USBI_CLOCK_MONOTONIC)
+		return clock_gettime(CLOCK_MONOTONIC, tp);
+
+	return (LIBUSB_ERROR_INVALID_PARAM);
+}
+
+int
+_errno_to_libusb(int err)
+{
+	usbi_dbg("error: %s (%d)", strerror(err), err);
+
+	switch (err) {
+	case EIO:
+		return (LIBUSB_ERROR_IO);
+	case EACCES:
+		return (LIBUSB_ERROR_ACCESS);
+	case ENOENT:
+		return (LIBUSB_ERROR_NO_DEVICE);
+	case ENOMEM:
+		return (LIBUSB_ERROR_NO_MEM);
+	case ETIMEDOUT:
+		return (LIBUSB_ERROR_TIMEOUT);
+	}
+
+	return (LIBUSB_ERROR_OTHER);
+}
+
+int
+_cache_active_config_descriptor(struct libusb_device *dev)
+{
+	struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
+	struct usb_device_cdesc udc;
+	struct usb_device_fdesc udf;
+	unsigned char* buf;
+	int fd, len, err;
+
+	if ((fd = _bus_open(dev->bus_number)) < 0)
+		return _errno_to_libusb(errno);
+
+	usbi_dbg("fd %d, addr %d", fd, dev->device_address);
+
+	udc.udc_bus = dev->bus_number;
+	udc.udc_addr = dev->device_address;
+	udc.udc_config_index = USB_CURRENT_CONFIG_INDEX;
+	if (ioctl(fd, USB_DEVICE_GET_CDESC, &udc) < 0) {
+		err = errno;
+		close(fd);
+		return _errno_to_libusb(errno);
+	}
+
+	usbi_dbg("active bLength %d", udc.udc_desc.bLength);
+
+	len = UGETW(udc.udc_desc.wTotalLength);
+	buf = malloc(len);
+	if (buf == NULL)
+		return (LIBUSB_ERROR_NO_MEM);
+
+	udf.udf_bus = dev->bus_number;
+	udf.udf_addr = dev->device_address;
+	udf.udf_config_index = udc.udc_config_index;
+	udf.udf_size = len;
+	udf.udf_data = buf;
+
+	usbi_dbg("index %d, len %d", udf.udf_config_index, len);
+
+	if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) {
+		err = errno;
+		close(fd);
+		free(buf);
+		return _errno_to_libusb(err);
+	}
+	close(fd);
+
+	if (dpriv->cdesc)
+		free(dpriv->cdesc);
+	dpriv->cdesc = buf;
+
+	return (LIBUSB_SUCCESS);
+}
+
+int
+_sync_control_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	struct libusb_control_setup *setup;
+	struct device_priv *dpriv;
+	struct usb_ctl_request req;
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
+	setup = (struct libusb_control_setup *)transfer->buffer;
+
+	usbi_dbg("type %x request %x value %x index %d length %d timeout %d",
+	    setup->bmRequestType, setup->bRequest,
+	    libusb_le16_to_cpu(setup->wValue),
+	    libusb_le16_to_cpu(setup->wIndex),
+	    libusb_le16_to_cpu(setup->wLength), transfer->timeout);
+
+	req.ucr_addr = transfer->dev_handle->dev->device_address;
+	req.ucr_request.bmRequestType = setup->bmRequestType;
+	req.ucr_request.bRequest = setup->bRequest;
+	/* Don't use USETW, libusb already deals with the endianness */
+	(*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
+	(*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
+	(*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
+	req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
+
+	if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
+		req.ucr_flags = USBD_SHORT_XFER_OK;
+
+	if (dpriv->devname == NULL) {
+		/*
+		 * XXX If the device is not attached to ugen(4) it is
+		 * XXX still possible to submit a control transfer but
+		 * XXX with the default timeout only.
+		 */
+		int fd, err;
+
+		if ((fd = _bus_open(transfer->dev_handle->dev->bus_number)) < 0)
+			return _errno_to_libusb(errno);
+
+		if ((ioctl(fd, USB_REQUEST, &req)) < 0) {
+			err = errno;
+			close(fd);
+			return _errno_to_libusb(err);
+		}
+		close(fd);
+	} else {
+		if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
+			return _errno_to_libusb(errno);
+
+		if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
+			return _errno_to_libusb(errno);
+	}
+
+	itransfer->transferred = req.ucr_actlen;
+
+	usbi_dbg("transferred %d", itransfer->transferred);
+
+	return (0);
+}
+
+int
+_access_endpoint(struct libusb_transfer *transfer)
+{
+	struct handle_priv *hpriv;
+	struct device_priv *dpriv;
+	char devnode[16];
+	int fd, endpt;
+	mode_t mode;
+
+	hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
+	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
+
+	endpt = UE_GET_ADDR(transfer->endpoint);
+	mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
+
+	usbi_dbg("endpoint %d mode %d", endpt, mode);
+
+	if (hpriv->endpoints[endpt] < 0) {
+		/* Pick the right endpoint node */
+		snprintf(devnode, sizeof(devnode), DEVPATH "%s.%02d",
+		    dpriv->devname, endpt);
+
+		/* We may need to read/write to the same endpoint later. */
+		if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
+			if ((fd = open(devnode, mode)) < 0)
+				return (-1);
+
+		hpriv->endpoints[endpt] = fd;
+	}
+
+	return (hpriv->endpoints[endpt]);
+}
+
+int
+_sync_gen_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer;
+	struct device_priv *dpriv;
+	int fd, nr = 1;
+
+	transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
+
+	if (dpriv->devname == NULL)
+		return (LIBUSB_ERROR_NOT_SUPPORTED);
+
+	/*
+	 * Bulk, Interrupt or Isochronous transfer depends on the
+	 * endpoint and thus the node to open.
+	 */
+	if ((fd = _access_endpoint(transfer)) < 0)
+		return _errno_to_libusb(errno);
+
+	if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
+		return _errno_to_libusb(errno);
+
+	if (IS_XFERIN(transfer)) {
+		if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
+			if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
+				return _errno_to_libusb(errno);
+
+		nr = read(fd, transfer->buffer, transfer->length);
+	} else {
+		nr = write(fd, transfer->buffer, transfer->length);
+	}
+
+	if (nr < 0)
+		return _errno_to_libusb(errno);
+
+	itransfer->transferred = nr;
+
+	return (0);
+}
+
+int
+_bus_open(int number)
+{
+	char busnode[16];
+
+	snprintf(busnode, sizeof(busnode), USBDEV "%d", number);
+
+	return open(busnode, O_RDWR);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/poll_posix.c

@@ -0,0 +1,53 @@
+/*
+ * poll_posix: poll compatibility wrapper for POSIX systems
+ * Copyright © 2013 RealVNC Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <config.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "libusbi.h"
+
+int usbi_pipe(int pipefd[2])
+{
+	int ret = pipe(pipefd);
+	if (ret != 0) {
+		return ret;
+	}
+	ret = fcntl(pipefd[1], F_GETFL);
+	if (ret == -1) {
+		usbi_dbg("Failed to get pipe fd flags: %d", errno);
+		goto err_close_pipe;
+	}
+	ret = fcntl(pipefd[1], F_SETFL, ret | O_NONBLOCK);
+	if (ret != 0) {
+		usbi_dbg("Failed to set non-blocking on new pipe: %d", errno);
+		goto err_close_pipe;
+	}
+
+	return 0;
+
+err_close_pipe:
+	usbi_close(pipefd[0]);
+	usbi_close(pipefd[1]);
+	return ret;
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/poll_posix.h

@@ -0,0 +1,11 @@
+#ifndef LIBUSB_POLL_POSIX_H
+#define LIBUSB_POLL_POSIX_H
+
+#define usbi_write write
+#define usbi_read read
+#define usbi_close close
+#define usbi_poll poll
+
+int usbi_pipe(int pipefd[2]);
+
+#endif /* LIBUSB_POLL_POSIX_H */

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/poll_windows.c

@@ -0,0 +1,728 @@
+/*
+ * poll_windows: poll compatibility wrapper for Windows
+ * Copyright © 2012-2013 RealVNC Ltd.
+ * Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+/*
+ * poll() and pipe() Windows compatibility layer for libusb 1.0
+ *
+ * The way this layer works is by using OVERLAPPED with async I/O transfers, as
+ * OVERLAPPED have an associated event which is flagged for I/O completion.
+ *
+ * For USB pollable async I/O, you would typically:
+ * - obtain a Windows HANDLE to a file or device that has been opened in
+ *   OVERLAPPED mode
+ * - call usbi_create_fd with this handle to obtain a custom fd.
+ *   Note that if you need simultaneous R/W access, you need to call create_fd
+ *   twice, once in RW_READ and once in RW_WRITE mode to obtain 2 separate
+ *   pollable fds
+ * - leave the core functions call the poll routine and flag POLLIN/POLLOUT
+ *
+ * The pipe pollable synchronous I/O works using the overlapped event associated
+ * with a fake pipe. The read/write functions are only meant to be used in that
+ * context.
+ */
+#include <config.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libusbi.h"
+
+// Uncomment to debug the polling layer
+//#define DEBUG_POLL_WINDOWS
+#if defined(DEBUG_POLL_WINDOWS)
+#define poll_dbg usbi_dbg
+#else
+// MSVC++ < 2005 cannot use a variadic argument and non MSVC
+// compilers produce warnings if parenthesis are omitted.
+#if defined(_MSC_VER) && (_MSC_VER < 1400)
+#define poll_dbg
+#else
+#define poll_dbg(...)
+#endif
+#endif
+
+#if defined(_PREFAST_)
+#pragma warning(disable:28719)
+#endif
+
+#define CHECK_INIT_POLLING do {if(!is_polling_set) init_polling();} while(0)
+
+// public fd data
+const struct winfd INVALID_WINFD = {-1, INVALID_HANDLE_VALUE, NULL, NULL, NULL, RW_NONE};
+struct winfd poll_fd[MAX_FDS];
+// internal fd data
+struct {
+	CRITICAL_SECTION mutex; // lock for fds
+	// Additional variables for XP CancelIoEx partial emulation
+	HANDLE original_handle;
+	DWORD thread_id;
+} _poll_fd[MAX_FDS];
+
+// globals
+BOOLEAN is_polling_set = FALSE;
+LONG pipe_number = 0;
+static volatile LONG compat_spinlock = 0;
+
+#if !defined(_WIN32_WCE)
+// CancelIoEx, available on Vista and later only, provides the ability to cancel
+// a single transfer (OVERLAPPED) when used. As it may not be part of any of the
+// platform headers, we hook into the Kernel32 system DLL directly to seek it.
+static BOOL (__stdcall *pCancelIoEx)(HANDLE, LPOVERLAPPED) = NULL;
+#define Use_Duplicate_Handles (pCancelIoEx == NULL)
+
+static inline void setup_cancel_io(void)
+{
+	HMODULE hKernel32 = GetModuleHandleA("KERNEL32");
+	if (hKernel32 != NULL) {
+		pCancelIoEx = (BOOL (__stdcall *)(HANDLE,LPOVERLAPPED))
+			GetProcAddress(hKernel32, "CancelIoEx");
+	}
+	usbi_dbg("Will use CancelIo%s for I/O cancellation",
+		Use_Duplicate_Handles?"":"Ex");
+}
+
+static inline BOOL cancel_io(int _index)
+{
+	if ((_index < 0) || (_index >= MAX_FDS)) {
+		return FALSE;
+	}
+
+	if ( (poll_fd[_index].fd < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
+	  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL) ) {
+		return TRUE;
+	}
+	if (poll_fd[_index].itransfer && poll_fd[_index].cancel_fn) {
+		// Cancel outstanding transfer via the specific callback
+		(*poll_fd[_index].cancel_fn)(poll_fd[_index].itransfer);
+		return TRUE;
+	}
+	if (pCancelIoEx != NULL) {
+		return (*pCancelIoEx)(poll_fd[_index].handle, poll_fd[_index].overlapped);
+	}
+	if (_poll_fd[_index].thread_id == GetCurrentThreadId()) {
+		return CancelIo(poll_fd[_index].handle);
+	}
+	usbi_warn(NULL, "Unable to cancel I/O that was started from another thread");
+	return FALSE;
+}
+#else
+#define Use_Duplicate_Handles FALSE
+
+static __inline void setup_cancel_io()
+{
+	// No setup needed on WinCE
+}
+
+static __inline BOOL cancel_io(int _index)
+{
+	if ((_index < 0) || (_index >= MAX_FDS)) {
+		return FALSE;
+	}
+	if ( (poll_fd[_index].fd < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
+	  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL) ) {
+		return TRUE;
+	}
+	if (poll_fd[_index].itransfer && poll_fd[_index].cancel_fn) {
+		// Cancel outstanding transfer via the specific callback
+		(*poll_fd[_index].cancel_fn)(poll_fd[_index].itransfer);
+	}
+	return TRUE;
+}
+#endif
+
+// Init
+void init_polling(void)
+{
+	int i;
+
+	while (InterlockedExchange((LONG *)&compat_spinlock, 1) == 1) {
+		SleepEx(0, TRUE);
+	}
+	if (!is_polling_set) {
+		setup_cancel_io();
+		for (i=0; i<MAX_FDS; i++) {
+			poll_fd[i] = INVALID_WINFD;
+			_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
+			_poll_fd[i].thread_id = 0;
+			InitializeCriticalSection(&_poll_fd[i].mutex);
+		}
+		is_polling_set = TRUE;
+	}
+	InterlockedExchange((LONG *)&compat_spinlock, 0);
+}
+
+// Internal function to retrieve the table index (and lock the fd mutex)
+static int _fd_to_index_and_lock(int fd)
+{
+	int i;
+
+	if (fd < 0)
+		return -1;
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].fd == fd) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have changed before we got to critical
+			if (poll_fd[i].fd != fd) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+			return i;
+		}
+	}
+	return -1;
+}
+
+static OVERLAPPED *create_overlapped(void)
+{
+	OVERLAPPED *overlapped = (OVERLAPPED*) calloc(1, sizeof(OVERLAPPED));
+	if (overlapped == NULL) {
+		return NULL;
+	}
+	overlapped->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+	if(overlapped->hEvent == NULL) {
+		free (overlapped);
+		return NULL;
+	}
+	return overlapped;
+}
+
+static void free_overlapped(OVERLAPPED *overlapped)
+{
+	if (overlapped == NULL)
+		return;
+
+	if ( (overlapped->hEvent != 0)
+	  && (overlapped->hEvent != INVALID_HANDLE_VALUE) ) {
+		CloseHandle(overlapped->hEvent);
+	}
+	free(overlapped);
+}
+
+void exit_polling(void)
+{
+	int i;
+
+	while (InterlockedExchange((LONG *)&compat_spinlock, 1) == 1) {
+		SleepEx(0, TRUE);
+	}
+	if (is_polling_set) {
+		is_polling_set = FALSE;
+
+		for (i=0; i<MAX_FDS; i++) {
+			// Cancel any async I/O (handle can be invalid)
+			cancel_io(i);
+			// If anything was pending on that I/O, it should be
+			// terminating, and we should be able to access the fd
+			// mutex lock before too long
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			free_overlapped(poll_fd[i].overlapped);
+			if (Use_Duplicate_Handles) {
+				// Close duplicate handle
+				if (_poll_fd[i].original_handle != INVALID_HANDLE_VALUE) {
+					CloseHandle(poll_fd[i].handle);
+				}
+			}
+			poll_fd[i] = INVALID_WINFD;
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			DeleteCriticalSection(&_poll_fd[i].mutex);
+		}
+	}
+	InterlockedExchange((LONG *)&compat_spinlock, 0);
+}
+
+/*
+ * Create a fake pipe.
+ * As libusb only uses pipes for signaling, all we need from a pipe is an
+ * event. To that extent, we create a single wfd and overlapped as a means
+ * to access that event.
+ */
+int usbi_pipe(int filedes[2])
+{
+	int i;
+	OVERLAPPED* overlapped;
+
+	CHECK_INIT_POLLING;
+
+	overlapped = create_overlapped();
+
+	if (overlapped == NULL) {
+		return -1;
+	}
+	// The overlapped must have status pending for signaling to work in poll
+	overlapped->Internal = STATUS_PENDING;
+	overlapped->InternalHigh = 0;
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].fd < 0) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have been allocated before we got to critical
+			if (poll_fd[i].fd >= 0) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+
+			// Use index as the unique fd number
+			poll_fd[i].fd = i;
+			// Read end of the "pipe"
+			filedes[0] = poll_fd[i].fd;
+			// We can use the same handle for both ends
+			filedes[1] = filedes[0];
+
+			poll_fd[i].handle = DUMMY_HANDLE;
+			poll_fd[i].overlapped = overlapped;
+			// There's no polling on the write end, so we just use READ for our needs
+			poll_fd[i].rw = RW_READ;
+			_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			return 0;
+		}
+	}
+	free_overlapped(overlapped);
+	return -1;
+}
+
+/*
+ * Create both an fd and an OVERLAPPED from an open Windows handle, so that
+ * it can be used with our polling function
+ * The handle MUST support overlapped transfers (usually requires CreateFile
+ * with FILE_FLAG_OVERLAPPED)
+ * Return a pollable file descriptor struct, or INVALID_WINFD on error
+ *
+ * Note that the fd returned by this function is a per-transfer fd, rather
+ * than a per-session fd and cannot be used for anything else but our
+ * custom functions (the fd itself points to the NUL: device)
+ * if you plan to do R/W on the same handle, you MUST create 2 fds: one for
+ * read and one for write. Using a single R/W fd is unsupported and will
+ * produce unexpected results
+ */
+struct winfd usbi_create_fd(HANDLE handle, int access_mode, struct usbi_transfer *itransfer, cancel_transfer *cancel_fn)
+{
+	int i;
+	struct winfd wfd = INVALID_WINFD;
+	OVERLAPPED* overlapped = NULL;
+
+	CHECK_INIT_POLLING;
+
+	if ((handle == 0) || (handle == INVALID_HANDLE_VALUE)) {
+		return INVALID_WINFD;
+	}
+
+	wfd.itransfer = itransfer;
+	wfd.cancel_fn = cancel_fn;
+
+	if ((access_mode != RW_READ) && (access_mode != RW_WRITE)) {
+		usbi_warn(NULL, "only one of RW_READ or RW_WRITE are supported. "
+			"If you want to poll for R/W simultaneously, create multiple fds from the same handle.");
+		return INVALID_WINFD;
+	}
+	if (access_mode == RW_READ) {
+		wfd.rw = RW_READ;
+	} else {
+		wfd.rw = RW_WRITE;
+	}
+
+	overlapped = create_overlapped();
+	if(overlapped == NULL) {
+		return INVALID_WINFD;
+	}
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].fd < 0) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have been removed before we got to critical
+			if (poll_fd[i].fd >= 0) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+			// Use index as the unique fd number
+			wfd.fd = i;
+			// Attempt to emulate some of the CancelIoEx behaviour on platforms
+			// that don't have it
+			if (Use_Duplicate_Handles) {
+				_poll_fd[i].thread_id = GetCurrentThreadId();
+				if (!DuplicateHandle(GetCurrentProcess(), handle, GetCurrentProcess(),
+					&wfd.handle, 0, TRUE, DUPLICATE_SAME_ACCESS)) {
+					usbi_dbg("could not duplicate handle for CancelIo - using original one");
+					wfd.handle = handle;
+					// Make sure we won't close the original handle on fd deletion then
+					_poll_fd[i].original_handle = INVALID_HANDLE_VALUE;
+				} else {
+					_poll_fd[i].original_handle = handle;
+				}
+			} else {
+				wfd.handle = handle;
+			}
+			wfd.overlapped = overlapped;
+			memcpy(&poll_fd[i], &wfd, sizeof(struct winfd));
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			return wfd;
+		}
+	}
+	free_overlapped(overlapped);
+	return INVALID_WINFD;
+}
+
+static void _free_index(int _index)
+{
+	// Cancel any async IO (Don't care about the validity of our handles for this)
+	cancel_io(_index);
+	// close the duplicate handle (if we have an actual duplicate)
+	if (Use_Duplicate_Handles) {
+		if (_poll_fd[_index].original_handle != INVALID_HANDLE_VALUE) {
+			CloseHandle(poll_fd[_index].handle);
+		}
+		_poll_fd[_index].original_handle = INVALID_HANDLE_VALUE;
+		_poll_fd[_index].thread_id = 0;
+	}
+	free_overlapped(poll_fd[_index].overlapped);
+	poll_fd[_index] = INVALID_WINFD;
+}
+
+/*
+ * Release a pollable file descriptor.
+ *
+ * Note that the associated Windows handle is not closed by this call
+ */
+void usbi_free_fd(struct winfd *wfd)
+{
+	int _index;
+
+	CHECK_INIT_POLLING;
+
+	_index = _fd_to_index_and_lock(wfd->fd);
+	if (_index < 0) {
+		return;
+	}
+	_free_index(_index);
+	*wfd = INVALID_WINFD;
+	LeaveCriticalSection(&_poll_fd[_index].mutex);
+}
+
+/*
+ * The functions below perform various conversions between fd, handle and OVERLAPPED
+ */
+struct winfd fd_to_winfd(int fd)
+{
+	int i;
+	struct winfd wfd;
+
+	CHECK_INIT_POLLING;
+
+	if (fd < 0)
+		return INVALID_WINFD;
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].fd == fd) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have been deleted before we got to critical
+			if (poll_fd[i].fd != fd) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			return wfd;
+		}
+	}
+	return INVALID_WINFD;
+}
+
+struct winfd handle_to_winfd(HANDLE handle)
+{
+	int i;
+	struct winfd wfd;
+
+	CHECK_INIT_POLLING;
+
+	if ((handle == 0) || (handle == INVALID_HANDLE_VALUE))
+		return INVALID_WINFD;
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].handle == handle) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have been deleted before we got to critical
+			if (poll_fd[i].handle != handle) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			return wfd;
+		}
+	}
+	return INVALID_WINFD;
+}
+
+struct winfd overlapped_to_winfd(OVERLAPPED* overlapped)
+{
+	int i;
+	struct winfd wfd;
+
+	CHECK_INIT_POLLING;
+
+	if (overlapped == NULL)
+		return INVALID_WINFD;
+
+	for (i=0; i<MAX_FDS; i++) {
+		if (poll_fd[i].overlapped == overlapped) {
+			EnterCriticalSection(&_poll_fd[i].mutex);
+			// fd might have been deleted before we got to critical
+			if (poll_fd[i].overlapped != overlapped) {
+				LeaveCriticalSection(&_poll_fd[i].mutex);
+				continue;
+			}
+			memcpy(&wfd, &poll_fd[i], sizeof(struct winfd));
+			LeaveCriticalSection(&_poll_fd[i].mutex);
+			return wfd;
+		}
+	}
+	return INVALID_WINFD;
+}
+
+/*
+ * POSIX poll equivalent, using Windows OVERLAPPED
+ * Currently, this function only accepts one of POLLIN or POLLOUT per fd
+ * (but you can create multiple fds from the same handle for read and write)
+ */
+int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout)
+{
+	unsigned i;
+	int _index, object_index, triggered;
+	HANDLE *handles_to_wait_on;
+	int *handle_to_index;
+	DWORD nb_handles_to_wait_on = 0;
+	DWORD ret;
+
+	CHECK_INIT_POLLING;
+
+	triggered = 0;
+	handles_to_wait_on = (HANDLE*) calloc(nfds+1, sizeof(HANDLE));	// +1 for fd_update
+	handle_to_index = (int*) calloc(nfds, sizeof(int));
+	if ((handles_to_wait_on == NULL) || (handle_to_index == NULL)) {
+		errno = ENOMEM;
+		triggered = -1;
+		goto poll_exit;
+	}
+
+	for (i = 0; i < nfds; ++i) {
+		fds[i].revents = 0;
+
+		// Only one of POLLIN or POLLOUT can be selected with this version of poll (not both)
+		if ((fds[i].events & ~POLLIN) && (!(fds[i].events & POLLOUT))) {
+			fds[i].revents |= POLLERR;
+			errno = EACCES;
+			usbi_warn(NULL, "unsupported set of events");
+			triggered = -1;
+			goto poll_exit;
+		}
+
+		_index = _fd_to_index_and_lock(fds[i].fd);
+		poll_dbg("fd[%d]=%d: (overlapped=%p) got events %04X", i, poll_fd[_index].fd, poll_fd[_index].overlapped, fds[i].events);
+
+		if ( (_index < 0) || (poll_fd[_index].handle == INVALID_HANDLE_VALUE)
+		  || (poll_fd[_index].handle == 0) || (poll_fd[_index].overlapped == NULL)) {
+			fds[i].revents |= POLLNVAL | POLLERR;
+			errno = EBADF;
+			if (_index >= 0) {
+				LeaveCriticalSection(&_poll_fd[_index].mutex);
+			}
+			usbi_warn(NULL, "invalid fd");
+			triggered = -1;
+			goto poll_exit;
+		}
+
+		// IN or OUT must match our fd direction
+		if ((fds[i].events & POLLIN) && (poll_fd[_index].rw != RW_READ)) {
+			fds[i].revents |= POLLNVAL | POLLERR;
+			errno = EBADF;
+			usbi_warn(NULL, "attempted POLLIN on fd without READ access");
+			LeaveCriticalSection(&_poll_fd[_index].mutex);
+			triggered = -1;
+			goto poll_exit;
+		}
+
+		if ((fds[i].events & POLLOUT) && (poll_fd[_index].rw != RW_WRITE)) {
+			fds[i].revents |= POLLNVAL | POLLERR;
+			errno = EBADF;
+			usbi_warn(NULL, "attempted POLLOUT on fd without WRITE access");
+			LeaveCriticalSection(&_poll_fd[_index].mutex);
+			triggered = -1;
+			goto poll_exit;
+		}
+
+		// The following macro only works if overlapped I/O was reported pending
+		if ( (HasOverlappedIoCompleted(poll_fd[_index].overlapped))
+		  || (HasOverlappedIoCompletedSync(poll_fd[_index].overlapped)) ) {
+			poll_dbg("  completed");
+			// checks above should ensure this works:
+			fds[i].revents = fds[i].events;
+			triggered++;
+		} else {
+			handles_to_wait_on[nb_handles_to_wait_on] = poll_fd[_index].overlapped->hEvent;
+			handle_to_index[nb_handles_to_wait_on] = i;
+			nb_handles_to_wait_on++;
+		}
+		LeaveCriticalSection(&_poll_fd[_index].mutex);
+	}
+
+	// If nothing was triggered, wait on all fds that require it
+	if ((timeout != 0) && (triggered == 0) && (nb_handles_to_wait_on != 0)) {
+		if (timeout < 0) {
+			poll_dbg("starting infinite wait for %u handles...", (unsigned int)nb_handles_to_wait_on);
+		} else {
+			poll_dbg("starting %d ms wait for %u handles...", timeout, (unsigned int)nb_handles_to_wait_on);
+		}
+		ret = WaitForMultipleObjects(nb_handles_to_wait_on, handles_to_wait_on,
+			FALSE, (timeout<0)?INFINITE:(DWORD)timeout);
+		object_index = ret-WAIT_OBJECT_0;
+		if ((object_index >= 0) && ((DWORD)object_index < nb_handles_to_wait_on)) {
+			poll_dbg("  completed after wait");
+			i = handle_to_index[object_index];
+			_index = _fd_to_index_and_lock(fds[i].fd);
+			fds[i].revents = fds[i].events;
+			triggered++;
+			if (_index >= 0) {
+				LeaveCriticalSection(&_poll_fd[_index].mutex);
+			}
+		} else if (ret == WAIT_TIMEOUT) {
+			poll_dbg("  timed out");
+			triggered = 0;	// 0 = timeout
+		} else {
+			errno = EIO;
+			triggered = -1;	// error
+		}
+	}
+
+poll_exit:
+	if (handles_to_wait_on != NULL) {
+		free(handles_to_wait_on);
+	}
+	if (handle_to_index != NULL) {
+		free(handle_to_index);
+	}
+	return triggered;
+}
+
+/*
+ * close a fake pipe fd
+ */
+int usbi_close(int fd)
+{
+	int _index;
+	int r = -1;
+
+	CHECK_INIT_POLLING;
+
+	_index = _fd_to_index_and_lock(fd);
+
+	if (_index < 0) {
+		errno = EBADF;
+	} else {
+		free_overlapped(poll_fd[_index].overlapped);
+		poll_fd[_index] = INVALID_WINFD;
+		LeaveCriticalSection(&_poll_fd[_index].mutex);
+	}
+	return r;
+}
+
+/*
+ * synchronous write for fake "pipe" signaling
+ */
+ssize_t usbi_write(int fd, const void *buf, size_t count)
+{
+	int _index;
+	UNUSED(buf);
+
+	CHECK_INIT_POLLING;
+
+	if (count != sizeof(unsigned char)) {
+		usbi_err(NULL, "this function should only used for signaling");
+		return -1;
+	}
+
+	_index = _fd_to_index_and_lock(fd);
+
+	if ( (_index < 0) || (poll_fd[_index].overlapped == NULL) ) {
+		errno = EBADF;
+		if (_index >= 0) {
+			LeaveCriticalSection(&_poll_fd[_index].mutex);
+		}
+		return -1;
+	}
+
+	poll_dbg("set pipe event (fd = %d, thread = %08X)", _index, (unsigned int)GetCurrentThreadId());
+	SetEvent(poll_fd[_index].overlapped->hEvent);
+	poll_fd[_index].overlapped->Internal = STATUS_WAIT_0;
+	// If two threads write on the pipe at the same time, we need to
+	// process two separate reads => use the overlapped as a counter
+	poll_fd[_index].overlapped->InternalHigh++;
+
+	LeaveCriticalSection(&_poll_fd[_index].mutex);
+	return sizeof(unsigned char);
+}
+
+/*
+ * synchronous read for fake "pipe" signaling
+ */
+ssize_t usbi_read(int fd, void *buf, size_t count)
+{
+	int _index;
+	ssize_t r = -1;
+	UNUSED(buf);
+
+	CHECK_INIT_POLLING;
+
+	if (count != sizeof(unsigned char)) {
+		usbi_err(NULL, "this function should only used for signaling");
+		return -1;
+	}
+
+	_index = _fd_to_index_and_lock(fd);
+
+	if (_index < 0) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (WaitForSingleObject(poll_fd[_index].overlapped->hEvent, INFINITE) != WAIT_OBJECT_0) {
+		usbi_warn(NULL, "waiting for event failed: %u", (unsigned int)GetLastError());
+		errno = EIO;
+		goto out;
+	}
+
+	poll_dbg("clr pipe event (fd = %d, thread = %08X)", _index, (unsigned int)GetCurrentThreadId());
+	poll_fd[_index].overlapped->InternalHigh--;
+	// Don't reset unless we don't have any more events to process
+	if (poll_fd[_index].overlapped->InternalHigh <= 0) {
+		ResetEvent(poll_fd[_index].overlapped->hEvent);
+		poll_fd[_index].overlapped->Internal = STATUS_PENDING;
+	}
+
+	r = sizeof(unsigned char);
+
+out:
+	LeaveCriticalSection(&_poll_fd[_index].mutex);
+	return r;
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/poll_windows.h

@@ -0,0 +1,131 @@
+/*
+ * Windows compat: POSIX compatibility wrapper
+ * Copyright © 2012-2013 RealVNC Ltd.
+ * Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+#pragma once
+
+#if defined(_MSC_VER)
+// disable /W4 MSVC warnings that are benign
+#pragma warning(disable:4127) // conditional expression is constant
+#endif
+
+// Handle synchronous completion through the overlapped structure
+#if !defined(STATUS_REPARSE)	// reuse the REPARSE status code
+#define STATUS_REPARSE ((LONG)0x00000104L)
+#endif
+#define STATUS_COMPLETED_SYNCHRONOUSLY	STATUS_REPARSE
+#if defined(_WIN32_WCE)
+// WinCE doesn't have a HasOverlappedIoCompleted() macro, so attempt to emulate it
+#define HasOverlappedIoCompleted(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) != STATUS_PENDING)
+#endif
+#define HasOverlappedIoCompletedSync(lpOverlapped)	(((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY)
+
+#define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2)
+
+/* Windows versions */
+enum windows_version {
+	WINDOWS_CE = -2,
+	WINDOWS_UNDEFINED = -1,
+	WINDOWS_UNSUPPORTED = 0,
+	WINDOWS_XP = 0x51,
+	WINDOWS_2003 = 0x52,	// Also XP x64
+	WINDOWS_VISTA = 0x60,
+	WINDOWS_7 = 0x61,
+	WINDOWS_8 = 0x62,
+	WINDOWS_8_1_OR_LATER = 0x63,
+	WINDOWS_MAX
+};
+extern int windows_version;
+
+#define MAX_FDS     256
+
+#define POLLIN      0x0001    /* There is data to read */
+#define POLLPRI     0x0002    /* There is urgent data to read */
+#define POLLOUT     0x0004    /* Writing now will not block */
+#define POLLERR     0x0008    /* Error condition */
+#define POLLHUP     0x0010    /* Hung up */
+#define POLLNVAL    0x0020    /* Invalid request: fd not open */
+
+struct pollfd {
+    int fd;           /* file descriptor */
+    short events;     /* requested events */
+    short revents;    /* returned events */
+};
+
+// access modes
+enum rw_type {
+	RW_NONE,
+	RW_READ,
+	RW_WRITE,
+};
+
+// fd struct that can be used for polling on Windows
+typedef int cancel_transfer(struct usbi_transfer *itransfer);
+
+struct winfd {
+	int fd;							// what's exposed to libusb core
+	HANDLE handle;					// what we need to attach overlapped to the I/O op, so we can poll it
+	OVERLAPPED* overlapped;			// what will report our I/O status
+	struct usbi_transfer *itransfer;		// Associated transfer, or NULL if completed
+	cancel_transfer *cancel_fn;		// Function pointer to cancel transfer API
+	enum rw_type rw;				// I/O transfer direction: read *XOR* write (NOT BOTH)
+};
+extern const struct winfd INVALID_WINFD;
+
+int usbi_pipe(int pipefd[2]);
+int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout);
+ssize_t usbi_write(int fd, const void *buf, size_t count);
+ssize_t usbi_read(int fd, void *buf, size_t count);
+int usbi_close(int fd);
+
+void init_polling(void);
+void exit_polling(void);
+struct winfd usbi_create_fd(HANDLE handle, int access_mode, 
+	struct usbi_transfer *transfer, cancel_transfer *cancel_fn);
+void usbi_free_fd(struct winfd* winfd);
+struct winfd fd_to_winfd(int fd);
+struct winfd handle_to_winfd(HANDLE handle);
+struct winfd overlapped_to_winfd(OVERLAPPED* overlapped);
+
+/*
+ * Timeval operations
+ */
+#if defined(DDKBUILD)
+#include <winsock.h>	// defines timeval functions on DDK
+#endif
+
+#if !defined(TIMESPEC_TO_TIMEVAL)
+#define TIMESPEC_TO_TIMEVAL(tv, ts) {                   \
+	(tv)->tv_sec = (long)(ts)->tv_sec;                  \
+	(tv)->tv_usec = (long)(ts)->tv_nsec / 1000;         \
+}
+#endif
+#if !defined(timersub)
+#define timersub(a, b, result)                          \
+do {                                                    \
+	(result)->tv_sec = (a)->tv_sec - (b)->tv_sec;       \
+	(result)->tv_usec = (a)->tv_usec - (b)->tv_usec;    \
+	if ((result)->tv_usec < 0) {                        \
+		--(result)->tv_sec;                             \
+		(result)->tv_usec += 1000000;                   \
+	}                                                   \
+} while (0)
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/sunos_usb.h

@@ -0,0 +1,74 @@
+/*
+ *
+ * Copyright (c) 2016, Oracle and/or its affiliates.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef	LIBUSB_SUNOS_H
+#define	LIBUSB_SUNOS_H
+
+#include <libdevinfo.h>
+#include <pthread.h>
+#include "libusbi.h"
+
+#define	READ	0
+#define	WRITE	1
+
+typedef struct sunos_device_priv {
+	uint8_t	cfgvalue;		/* active config value */
+	uint8_t	*raw_cfgdescr;		/* active config descriptor */
+	struct libusb_device_descriptor	dev_descr;	/* usb device descriptor */
+	char	*ugenpath;		/* name of the ugen(4) node */
+	char	*phypath;		/* physical path */
+} sunos_dev_priv_t;
+
+typedef	struct endpoint {
+	int datafd;	/* data file */
+	int statfd;	/* state file */
+} sunos_ep_priv_t;
+
+typedef struct sunos_device_handle_priv {
+	uint8_t			altsetting[USB_MAXINTERFACES];	/* a interface's alt */
+	uint8_t			config_index;
+	sunos_ep_priv_t		eps[USB_MAXENDPOINTS];
+	sunos_dev_priv_t	*dpriv; /* device private */
+} sunos_dev_handle_priv_t;
+
+typedef	struct sunos_transfer_priv {
+	struct aiocb		aiocb;
+	struct libusb_transfer	*transfer;
+} sunos_xfer_priv_t;
+
+struct node_args {
+	struct libusb_context	*ctx;
+	struct discovered_devs	**discdevs;
+	const char		*last_ugenpath;
+	di_devlink_handle_t	dlink_hdl;
+};
+
+struct devlink_cbarg {
+	struct node_args	*nargs;	/* di node walk arguments */
+	di_node_t		myself;	/* the di node */
+	di_minor_t		minor;
+};
+
+/* AIO callback args */
+struct aio_callback_args{
+	struct libusb_transfer *transfer;
+	struct aiocb aiocb;
+};
+
+#endif /* LIBUSB_SUNOS_H */

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/threads_posix.c

@@ -0,0 +1,79 @@
+/*
+ * libusb synchronization using POSIX Threads
+ *
+ * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>
+ * Copyright © 2011 Peter Stuge <peter@stuge.se>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <time.h>
+#if defined(__linux__) || defined(__OpenBSD__)
+# if defined(__OpenBSD__)
+#  define _BSD_SOURCE
+# endif
+# include <unistd.h>
+# include <sys/syscall.h>
+#elif defined(__APPLE__)
+# include <mach/mach.h>
+#elif defined(__CYGWIN__)
+# include <windows.h>
+#endif
+
+#include "threads_posix.h"
+#include "libusbi.h"
+
+int usbi_cond_timedwait(pthread_cond_t *cond,
+	pthread_mutex_t *mutex, const struct timeval *tv)
+{
+	struct timespec timeout;
+	int r;
+
+	r = usbi_backend->clock_gettime(USBI_CLOCK_REALTIME, &timeout);
+	if (r < 0)
+		return r;
+
+	timeout.tv_sec += tv->tv_sec;
+	timeout.tv_nsec += tv->tv_usec * 1000;
+	while (timeout.tv_nsec >= 1000000000L) {
+		timeout.tv_nsec -= 1000000000L;
+		timeout.tv_sec++;
+	}
+
+	return pthread_cond_timedwait(cond, mutex, &timeout);
+}
+
+int usbi_get_tid(void)
+{
+	int ret = -1;
+#if defined(__ANDROID__)
+	ret = gettid();
+#elif defined(__linux__)
+	ret = syscall(SYS_gettid);
+#elif defined(__OpenBSD__)
+	/* The following only works with OpenBSD > 5.1 as it requires
+	   real thread support. For 5.1 and earlier, -1 is returned. */
+	ret = syscall(SYS_getthrid);
+#elif defined(__APPLE__)
+	ret = mach_thread_self();
+	mach_port_deallocate(mach_task_self(), ret);
+#elif defined(__CYGWIN__)
+	ret = GetCurrentThreadId();
+#endif
+/* TODO: NetBSD thread ID support */
+	return ret;
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/threads_posix.h

@@ -0,0 +1,55 @@
+/*
+ * libusb synchronization using POSIX Threads
+ *
+ * Copyright © 2010 Peter Stuge <peter@stuge.se>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LIBUSB_THREADS_POSIX_H
+#define LIBUSB_THREADS_POSIX_H
+
+#include <pthread.h>
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#define usbi_mutex_static_t		pthread_mutex_t
+#define USBI_MUTEX_INITIALIZER		PTHREAD_MUTEX_INITIALIZER
+#define usbi_mutex_static_lock		pthread_mutex_lock
+#define usbi_mutex_static_unlock	pthread_mutex_unlock
+
+#define usbi_mutex_t			pthread_mutex_t
+#define usbi_mutex_init(mutex)		pthread_mutex_init((mutex), NULL)
+#define usbi_mutex_lock			pthread_mutex_lock
+#define usbi_mutex_unlock		pthread_mutex_unlock
+#define usbi_mutex_trylock		pthread_mutex_trylock
+#define usbi_mutex_destroy		pthread_mutex_destroy
+
+#define usbi_cond_t			pthread_cond_t
+#define usbi_cond_init(cond)		pthread_cond_init((cond), NULL)
+#define usbi_cond_wait			pthread_cond_wait
+#define usbi_cond_broadcast		pthread_cond_broadcast
+#define usbi_cond_destroy		pthread_cond_destroy
+
+#define usbi_tls_key_t			pthread_key_t
+#define usbi_tls_key_create(key)	pthread_key_create((key), NULL)
+#define usbi_tls_key_get		pthread_getspecific
+#define usbi_tls_key_set		pthread_setspecific
+#define usbi_tls_key_delete		pthread_key_delete
+
+int usbi_get_tid(void);
+
+#endif /* LIBUSB_THREADS_POSIX_H */

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/threads_windows.c

@@ -0,0 +1,259 @@
+/*
+ * libusb synchronization on Microsoft Windows
+ *
+ * Copyright © 2010 Michael Plante <michael.plante@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <objbase.h>
+#include <errno.h>
+
+#include "libusbi.h"
+
+struct usbi_cond_perthread {
+	struct list_head list;
+	DWORD tid;
+	HANDLE event;
+};
+
+int usbi_mutex_static_lock(usbi_mutex_static_t *mutex)
+{
+	if (!mutex)
+		return EINVAL;
+	while (InterlockedExchange(mutex, 1) == 1)
+		SleepEx(0, TRUE);
+	return 0;
+}
+
+int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex)
+{
+	if (!mutex)
+		return EINVAL;
+	InterlockedExchange(mutex, 0);
+	return 0;
+}
+
+int usbi_mutex_init(usbi_mutex_t *mutex)
+{
+	if (!mutex)
+		return EINVAL;
+	*mutex = CreateMutex(NULL, FALSE, NULL);
+	if (!*mutex)
+		return ENOMEM;
+	return 0;
+}
+
+int usbi_mutex_lock(usbi_mutex_t *mutex)
+{
+	DWORD result;
+
+	if (!mutex)
+		return EINVAL;
+	result = WaitForSingleObject(*mutex, INFINITE);
+	if (result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
+		return 0; // acquired (ToDo: check that abandoned is ok)
+	else
+		return EINVAL; // don't know how this would happen
+			       //   so don't know proper errno
+}
+
+int usbi_mutex_unlock(usbi_mutex_t *mutex)
+{
+	if (!mutex)
+		return EINVAL;
+	if (ReleaseMutex(*mutex))
+		return 0;
+	else
+		return EPERM;
+}
+
+int usbi_mutex_trylock(usbi_mutex_t *mutex)
+{
+	DWORD result;
+
+	if (!mutex)
+		return EINVAL;
+	result = WaitForSingleObject(*mutex, 0);
+	if (result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
+		return 0; // acquired (ToDo: check that abandoned is ok)
+	else if (result == WAIT_TIMEOUT)
+		return EBUSY;
+	else
+		return EINVAL; // don't know how this would happen
+			       //   so don't know proper error
+}
+
+int usbi_mutex_destroy(usbi_mutex_t *mutex)
+{
+	// It is not clear if CloseHandle failure is due to failure to unlock.
+	//   If so, this should be errno=EBUSY.
+	if (!mutex || !CloseHandle(*mutex))
+		return EINVAL;
+	*mutex = NULL;
+	return 0;
+}
+
+int usbi_cond_init(usbi_cond_t *cond)
+{
+	if (!cond)
+		return EINVAL;
+	list_init(&cond->waiters);
+	list_init(&cond->not_waiting);
+	return 0;
+}
+
+int usbi_cond_destroy(usbi_cond_t *cond)
+{
+	// This assumes no one is using this anymore.  The check MAY NOT BE safe.
+	struct usbi_cond_perthread *pos, *next_pos;
+
+	if(!cond)
+		return EINVAL;
+	if (!list_empty(&cond->waiters))
+		return EBUSY; // (!see above!)
+	list_for_each_entry_safe(pos, next_pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
+		CloseHandle(pos->event);
+		list_del(&pos->list);
+		free(pos);
+	}
+	return 0;
+}
+
+int usbi_cond_broadcast(usbi_cond_t *cond)
+{
+	// Assumes mutex is locked; this is not in keeping with POSIX spec, but
+	//   libusb does this anyway, so we simplify by not adding more sync
+	//   primitives to the CV definition!
+	int fail = 0;
+	struct usbi_cond_perthread *pos;
+
+	if (!cond)
+		return EINVAL;
+	list_for_each_entry(pos, &cond->waiters, list, struct usbi_cond_perthread) {
+		if (!SetEvent(pos->event))
+			fail = 1;
+	}
+	// The wait function will remove its respective item from the list.
+	return fail ? EINVAL : 0;
+}
+
+__inline static int usbi_cond_intwait(usbi_cond_t *cond,
+	usbi_mutex_t *mutex, DWORD timeout_ms)
+{
+	struct usbi_cond_perthread *pos;
+	int r, found = 0;
+	DWORD r2, tid = GetCurrentThreadId();
+
+	if (!cond || !mutex)
+		return EINVAL;
+	list_for_each_entry(pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
+		if(tid == pos->tid) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found) {
+		pos = calloc(1, sizeof(struct usbi_cond_perthread));
+		if (!pos)
+			return ENOMEM; // This errno is not POSIX-allowed.
+		pos->tid = tid;
+		pos->event = CreateEvent(NULL, FALSE, FALSE, NULL); // auto-reset.
+		if (!pos->event) {
+			free(pos);
+			return ENOMEM;
+		}
+		list_add(&pos->list, &cond->not_waiting);
+	}
+
+	list_del(&pos->list); // remove from not_waiting list.
+	list_add(&pos->list, &cond->waiters);
+
+	r  = usbi_mutex_unlock(mutex);
+	if (r)
+		return r;
+
+	r2 = WaitForSingleObject(pos->event, timeout_ms);
+	r = usbi_mutex_lock(mutex);
+	if (r)
+		return r;
+
+	list_del(&pos->list);
+	list_add(&pos->list, &cond->not_waiting);
+
+	if (r2 == WAIT_OBJECT_0)
+		return 0;
+	else if (r2 == WAIT_TIMEOUT)
+		return ETIMEDOUT;
+	else
+		return EINVAL;
+}
+// N.B.: usbi_cond_*wait() can also return ENOMEM, even though pthread_cond_*wait cannot!
+int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex)
+{
+	return usbi_cond_intwait(cond, mutex, INFINITE);
+}
+
+int usbi_cond_timedwait(usbi_cond_t *cond,
+	usbi_mutex_t *mutex, const struct timeval *tv)
+{
+	DWORD millis;
+
+	millis = (DWORD)(tv->tv_sec * 1000) + (tv->tv_usec / 1000);
+	/* round up to next millisecond */
+	if (tv->tv_usec % 1000)
+		millis++;
+	return usbi_cond_intwait(cond, mutex, millis);
+}
+
+int usbi_tls_key_create(usbi_tls_key_t *key)
+{
+	if (!key)
+		return EINVAL;
+	*key = TlsAlloc();
+	if (*key == TLS_OUT_OF_INDEXES)
+		return ENOMEM;
+	else
+		return 0;
+}
+
+void *usbi_tls_key_get(usbi_tls_key_t key)
+{
+	return TlsGetValue(key);
+}
+
+int usbi_tls_key_set(usbi_tls_key_t key, void *value)
+{
+	if (TlsSetValue(key, value))
+		return 0;
+	else
+		return EINVAL;
+}
+
+int usbi_tls_key_delete(usbi_tls_key_t key)
+{
+	if (TlsFree(key))
+		return 0;
+	else
+		return EINVAL;
+}
+
+int usbi_get_tid(void)
+{
+	return (int)GetCurrentThreadId();
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/threads_windows.h

@@ -0,0 +1,76 @@
+/*
+ * libusb synchronization on Microsoft Windows
+ *
+ * Copyright © 2010 Michael Plante <michael.plante@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LIBUSB_THREADS_WINDOWS_H
+#define LIBUSB_THREADS_WINDOWS_H
+
+#define usbi_mutex_static_t	volatile LONG
+#define USBI_MUTEX_INITIALIZER	0
+
+#define usbi_mutex_t		HANDLE
+
+typedef struct usbi_cond {
+	// Every time a thread touches the CV, it winds up in one of these lists.
+	//   It stays there until the CV is destroyed, even if the thread terminates.
+	struct list_head waiters;
+	struct list_head not_waiting;
+} usbi_cond_t;
+
+// We *were* getting timespec from pthread.h:
+#if (!defined(HAVE_STRUCT_TIMESPEC) && !defined(_TIMESPEC_DEFINED))
+#define HAVE_STRUCT_TIMESPEC 1
+#define _TIMESPEC_DEFINED 1
+struct timespec {
+	long tv_sec;
+	long tv_nsec;
+};
+#endif /* HAVE_STRUCT_TIMESPEC | _TIMESPEC_DEFINED */
+
+// We *were* getting ETIMEDOUT from pthread.h:
+#ifndef ETIMEDOUT
+#  define ETIMEDOUT 10060     /* This is the value in winsock.h. */
+#endif
+
+#define usbi_tls_key_t		DWORD
+
+int usbi_mutex_static_lock(usbi_mutex_static_t *mutex);
+int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex);
+
+int usbi_mutex_init(usbi_mutex_t *mutex);
+int usbi_mutex_lock(usbi_mutex_t *mutex);
+int usbi_mutex_unlock(usbi_mutex_t *mutex);
+int usbi_mutex_trylock(usbi_mutex_t *mutex);
+int usbi_mutex_destroy(usbi_mutex_t *mutex);
+
+int usbi_cond_init(usbi_cond_t *cond);
+int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex);
+int usbi_cond_timedwait(usbi_cond_t *cond,
+	usbi_mutex_t *mutex, const struct timeval *tv);
+int usbi_cond_broadcast(usbi_cond_t *cond);
+int usbi_cond_destroy(usbi_cond_t *cond);
+
+int usbi_tls_key_create(usbi_tls_key_t *key);
+void *usbi_tls_key_get(usbi_tls_key_t key);
+int usbi_tls_key_set(usbi_tls_key_t key, void *value);
+int usbi_tls_key_delete(usbi_tls_key_t key);
+
+int usbi_get_tid(void);
+
+#endif /* LIBUSB_THREADS_WINDOWS_H */

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/wince_usb.c

@@ -0,0 +1,899 @@
+/*
+ * Windows CE backend for libusb 1.0
+ * Copyright © 2011-2013 RealVNC Ltd.
+ * Large portions taken from Windows backend, which is
+ * Copyright © 2009-2010 Pete Batard <pbatard@gmail.com>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <stdint.h>
+#include <inttypes.h>
+
+#include "libusbi.h"
+#include "wince_usb.h"
+
+// Global variables
+int windows_version = WINDOWS_CE;
+static uint64_t hires_frequency, hires_ticks_to_ps;
+static HANDLE driver_handle = INVALID_HANDLE_VALUE;
+static int concurrent_usage = -1;
+
+/*
+ * Converts a windows error to human readable string
+ * uses retval as errorcode, or, if 0, use GetLastError()
+ */
+#if defined(ENABLE_LOGGING)
+static const char *windows_error_str(DWORD error_code)
+{
+	static TCHAR wErr_string[ERR_BUFFER_SIZE];
+	static char err_string[ERR_BUFFER_SIZE];
+
+	DWORD size;
+	int len;
+
+	if (error_code == 0)
+		error_code = GetLastError();
+
+	len = sprintf(err_string, "[%u] ", (unsigned int)error_code);
+
+	size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+		NULL, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+		wErr_string, ERR_BUFFER_SIZE, NULL);
+	if (size == 0) {
+		DWORD format_error = GetLastError();
+		if (format_error)
+			snprintf(err_string, ERR_BUFFER_SIZE,
+				"Windows error code %u (FormatMessage error code %u)",
+				(unsigned int)error_code, (unsigned int)format_error);
+		else
+			snprintf(err_string, ERR_BUFFER_SIZE, "Unknown error code %u", (unsigned int)error_code);
+	} else {
+		// Remove CR/LF terminators, if present
+		size_t pos = size - 2;
+		if (wErr_string[pos] == 0x0D)
+			wErr_string[pos] = 0;
+
+		if (!WideCharToMultiByte(CP_ACP, 0, wErr_string, -1, &err_string[len], ERR_BUFFER_SIZE - len, NULL, NULL))
+			strcpy(err_string, "Unable to convert error string");
+	}
+
+	return err_string;
+}
+#endif
+
+static struct wince_device_priv *_device_priv(struct libusb_device *dev)
+{
+	return (struct wince_device_priv *)dev->os_priv;
+}
+
+// ceusbkwrapper to libusb error code mapping
+static int translate_driver_error(DWORD error)
+{
+	switch (error) {
+	case ERROR_INVALID_PARAMETER:
+		return LIBUSB_ERROR_INVALID_PARAM;
+	case ERROR_CALL_NOT_IMPLEMENTED:
+	case ERROR_NOT_SUPPORTED:
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	case ERROR_NOT_ENOUGH_MEMORY:
+		return LIBUSB_ERROR_NO_MEM;
+	case ERROR_INVALID_HANDLE:
+		return LIBUSB_ERROR_NO_DEVICE;
+	case ERROR_BUSY:
+		return LIBUSB_ERROR_BUSY;
+
+	// Error codes that are either unexpected, or have
+	// no suitable LIBUSB_ERROR equivalent.
+	case ERROR_CANCELLED:
+	case ERROR_INTERNAL_ERROR:
+	default:
+		return LIBUSB_ERROR_OTHER;
+	}
+}
+
+static int init_dllimports(void)
+{
+	DLL_GET_HANDLE(ceusbkwrapper);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwOpenDriver, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceList, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwReleaseDeviceList, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceAddress, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwGetDeviceDescriptor, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwGetConfigDescriptor, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwCloseDriver, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwCancelTransfer, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwIssueControlTransfer, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwClaimInterface, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwReleaseInterface, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwSetInterfaceAlternateSetting, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwClearHaltHost, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwClearHaltDevice, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwGetConfig, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwSetConfig, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwResetDevice, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwKernelDriverActive, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwAttachKernelDriver, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwDetachKernelDriver, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwIssueBulkTransfer, TRUE);
+	DLL_LOAD_FUNC(ceusbkwrapper, UkwIsPipeHalted, TRUE);
+
+	return LIBUSB_SUCCESS;
+}
+
+static void exit_dllimports(void)
+{
+	DLL_FREE_HANDLE(ceusbkwrapper);
+}
+
+static int init_device(
+	struct libusb_device *dev, UKW_DEVICE drv_dev,
+	unsigned char bus_addr, unsigned char dev_addr)
+{
+	struct wince_device_priv *priv = _device_priv(dev);
+	int r = LIBUSB_SUCCESS;
+
+	dev->bus_number = bus_addr;
+	dev->device_address = dev_addr;
+	priv->dev = drv_dev;
+
+	if (!UkwGetDeviceDescriptor(priv->dev, &(priv->desc)))
+		r = translate_driver_error(GetLastError());
+
+	return r;
+}
+
+// Internal API functions
+static int wince_init(struct libusb_context *ctx)
+{
+	int r = LIBUSB_ERROR_OTHER;
+	HANDLE semaphore;
+	LARGE_INTEGER li_frequency;
+	TCHAR sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
+
+	_stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
+	semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
+	if (semaphore == NULL) {
+		usbi_err(ctx, "could not create semaphore: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	// A successful wait brings our semaphore count to 0 (unsignaled)
+	// => any concurent wait stalls until the semaphore's release
+	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
+		usbi_err(ctx, "failure to access semaphore: %s", windows_error_str(0));
+		CloseHandle(semaphore);
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	// NB: concurrent usage supposes that init calls are equally balanced with
+	// exit calls. If init is called more than exit, we will not exit properly
+	if ( ++concurrent_usage == 0 ) {	// First init?
+		// Initialize pollable file descriptors
+		init_polling();
+
+		// Load DLL imports
+		if (init_dllimports() != LIBUSB_SUCCESS) {
+			usbi_err(ctx, "could not resolve DLL functions");
+			r = LIBUSB_ERROR_NOT_SUPPORTED;
+			goto init_exit;
+		}
+
+		// try to open a handle to the driver
+		driver_handle = UkwOpenDriver();
+		if (driver_handle == INVALID_HANDLE_VALUE) {
+			usbi_err(ctx, "could not connect to driver");
+			r = LIBUSB_ERROR_NOT_SUPPORTED;
+			goto init_exit;
+		}
+
+		// find out if we have access to a monotonic (hires) timer
+		if (QueryPerformanceFrequency(&li_frequency)) {
+			hires_frequency = li_frequency.QuadPart;
+			// The hires frequency can go as high as 4 GHz, so we'll use a conversion
+			// to picoseconds to compute the tv_nsecs part in clock_gettime
+			hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
+			usbi_dbg("hires timer available (Frequency: %"PRIu64" Hz)", hires_frequency);
+		} else {
+			usbi_dbg("no hires timer available on this platform");
+			hires_frequency = 0;
+			hires_ticks_to_ps = UINT64_C(0);
+		}
+	}
+	// At this stage, either we went through full init successfully, or didn't need to
+	r = LIBUSB_SUCCESS;
+
+init_exit: // Holds semaphore here.
+	if (!concurrent_usage && r != LIBUSB_SUCCESS) { // First init failed?
+		exit_dllimports();
+		exit_polling();
+
+		if (driver_handle != INVALID_HANDLE_VALUE) {
+			UkwCloseDriver(driver_handle);
+			driver_handle = INVALID_HANDLE_VALUE;
+		}
+	}
+
+	if (r != LIBUSB_SUCCESS)
+		--concurrent_usage; // Not expected to call libusb_exit if we failed.
+
+	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
+	CloseHandle(semaphore);
+	return r;
+}
+
+static void wince_exit(void)
+{
+	HANDLE semaphore;
+	TCHAR sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
+
+	_stprintf(sem_name, _T("libusb_init%08X"), (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
+	semaphore = CreateSemaphore(NULL, 1, 1, sem_name);
+	if (semaphore == NULL)
+		return;
+
+	// A successful wait brings our semaphore count to 0 (unsignaled)
+	// => any concurent wait stalls until the semaphore release
+	if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
+		CloseHandle(semaphore);
+		return;
+	}
+
+	// Only works if exits and inits are balanced exactly
+	if (--concurrent_usage < 0) {	// Last exit
+		exit_dllimports();
+		exit_polling();
+
+		if (driver_handle != INVALID_HANDLE_VALUE) {
+			UkwCloseDriver(driver_handle);
+			driver_handle = INVALID_HANDLE_VALUE;
+		}
+	}
+
+	ReleaseSemaphore(semaphore, 1, NULL);	// increase count back to 1
+	CloseHandle(semaphore);
+}
+
+static int wince_get_device_list(
+	struct libusb_context *ctx,
+	struct discovered_devs **discdevs)
+{
+	UKW_DEVICE devices[MAX_DEVICE_COUNT];
+	struct discovered_devs *new_devices = *discdevs;
+	DWORD count = 0, i;
+	struct libusb_device *dev = NULL;
+	unsigned char bus_addr, dev_addr;
+	unsigned long session_id;
+	BOOL success;
+	DWORD release_list_offset = 0;
+	int r = LIBUSB_SUCCESS;
+
+	success = UkwGetDeviceList(driver_handle, devices, MAX_DEVICE_COUNT, &count);
+	if (!success) {
+		int libusbErr = translate_driver_error(GetLastError());
+		usbi_err(ctx, "could not get devices: %s", windows_error_str(0));
+		return libusbErr;
+	}
+
+	for (i = 0; i < count; ++i) {
+		release_list_offset = i;
+		success = UkwGetDeviceAddress(devices[i], &bus_addr, &dev_addr, &session_id);
+		if (!success) {
+			r = translate_driver_error(GetLastError());
+			usbi_err(ctx, "could not get device address for %u: %s", (unsigned int)i, windows_error_str(0));
+			goto err_out;
+		}
+
+		dev = usbi_get_device_by_session_id(ctx, session_id);
+		if (dev) {
+			usbi_dbg("using existing device for %u/%u (session %lu)",
+					bus_addr, dev_addr, session_id);
+			// Release just this element in the device list (as we already hold a
+			// reference to it).
+			UkwReleaseDeviceList(driver_handle, &devices[i], 1);
+			release_list_offset++;
+		} else {
+			usbi_dbg("allocating new device for %u/%u (session %lu)",
+					bus_addr, dev_addr, session_id);
+			dev = usbi_alloc_device(ctx, session_id);
+			if (!dev) {
+				r = LIBUSB_ERROR_NO_MEM;
+				goto err_out;
+			}
+
+			r = init_device(dev, devices[i], bus_addr, dev_addr);
+			if (r < 0)
+				goto err_out;
+
+			r = usbi_sanitize_device(dev);
+			if (r < 0)
+				goto err_out;
+		}
+
+		new_devices = discovered_devs_append(new_devices, dev);
+		if (!discdevs) {
+			r = LIBUSB_ERROR_NO_MEM;
+			goto err_out;
+		}
+
+		libusb_unref_device(dev);
+	}
+
+	*discdevs = new_devices;
+	return r;
+err_out:
+	*discdevs = new_devices;
+	libusb_unref_device(dev);
+	// Release the remainder of the unprocessed device list.
+	// The devices added to new_devices already will still be passed up to libusb,
+	// which can dispose of them at its leisure.
+	UkwReleaseDeviceList(driver_handle, &devices[release_list_offset], count - release_list_offset);
+	return r;
+}
+
+static int wince_open(struct libusb_device_handle *handle)
+{
+	// Nothing to do to open devices as a handle to it has
+	// been retrieved by wince_get_device_list
+	return LIBUSB_SUCCESS;
+}
+
+static void wince_close(struct libusb_device_handle *handle)
+{
+	// Nothing to do as wince_open does nothing.
+}
+
+static int wince_get_device_descriptor(
+	struct libusb_device *device,
+	unsigned char *buffer, int *host_endian)
+{
+	struct wince_device_priv *priv = _device_priv(device);
+
+	*host_endian = 1;
+	memcpy(buffer, &priv->desc, DEVICE_DESC_LENGTH);
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_get_active_config_descriptor(
+	struct libusb_device *device,
+	unsigned char *buffer, size_t len, int *host_endian)
+{
+	struct wince_device_priv *priv = _device_priv(device);
+	DWORD actualSize = len;
+
+	*host_endian = 0;
+	if (!UkwGetConfigDescriptor(priv->dev, UKW_ACTIVE_CONFIGURATION, buffer, len, &actualSize))
+		return translate_driver_error(GetLastError());
+
+	return actualSize;
+}
+
+static int wince_get_config_descriptor(
+	struct libusb_device *device,
+	uint8_t config_index,
+	unsigned char *buffer, size_t len, int *host_endian)
+{
+	struct wince_device_priv *priv = _device_priv(device);
+	DWORD actualSize = len;
+
+	*host_endian = 0;
+	if (!UkwGetConfigDescriptor(priv->dev, config_index, buffer, len, &actualSize))
+		return translate_driver_error(GetLastError());
+
+	return actualSize;
+}
+
+static int wince_get_configuration(
+	struct libusb_device_handle *handle,
+	int *config)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+	UCHAR cv = 0;
+
+	if (!UkwGetConfig(priv->dev, &cv))
+		return translate_driver_error(GetLastError());
+
+	(*config) = cv;
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_set_configuration(
+	struct libusb_device_handle *handle,
+	int config)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+	// Setting configuration 0 places the device in Address state.
+	// This should correspond to the "unconfigured state" required by
+	// libusb when the specified configuration is -1.
+	UCHAR cv = (config < 0) ? 0 : config;
+	if (!UkwSetConfig(priv->dev, cv))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_claim_interface(
+	struct libusb_device_handle *handle,
+	int interface_number)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwClaimInterface(priv->dev, interface_number))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_release_interface(
+	struct libusb_device_handle *handle,
+	int interface_number)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, 0))
+		return translate_driver_error(GetLastError());
+
+	if (!UkwReleaseInterface(priv->dev, interface_number))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_set_interface_altsetting(
+	struct libusb_device_handle *handle,
+	int interface_number, int altsetting)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwSetInterfaceAlternateSetting(priv->dev, interface_number, altsetting))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_clear_halt(
+	struct libusb_device_handle *handle,
+	unsigned char endpoint)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwClearHaltHost(priv->dev, endpoint))
+		return translate_driver_error(GetLastError());
+
+	if (!UkwClearHaltDevice(priv->dev, endpoint))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_reset_device(
+	struct libusb_device_handle *handle)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwResetDevice(priv->dev))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_kernel_driver_active(
+	struct libusb_device_handle *handle,
+	int interface_number)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+	BOOL result = FALSE;
+
+	if (!UkwKernelDriverActive(priv->dev, interface_number, &result))
+		return translate_driver_error(GetLastError());
+
+	return result ? 1 : 0;
+}
+
+static int wince_detach_kernel_driver(
+	struct libusb_device_handle *handle,
+	int interface_number)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwDetachKernelDriver(priv->dev, interface_number))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_attach_kernel_driver(
+	struct libusb_device_handle *handle,
+	int interface_number)
+{
+	struct wince_device_priv *priv = _device_priv(handle->dev);
+
+	if (!UkwAttachKernelDriver(priv->dev, interface_number))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static void wince_destroy_device(struct libusb_device *dev)
+{
+	struct wince_device_priv *priv = _device_priv(dev);
+
+	UkwReleaseDeviceList(driver_handle, &priv->dev, 1);
+}
+
+static void wince_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
+	struct winfd wfd = fd_to_winfd(transfer_priv->pollable_fd.fd);
+
+	// No need to cancel transfer as it is either complete or abandoned
+	wfd.itransfer = NULL;
+	CloseHandle(wfd.handle);
+	usbi_free_fd(&transfer_priv->pollable_fd);
+}
+
+static int wince_cancel_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
+	struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
+
+	if (!UkwCancelTransfer(priv->dev, transfer_priv->pollable_fd.overlapped, UKW_TF_NO_WAIT))
+		return translate_driver_error(GetLastError());
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_submit_control_or_bulk_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct wince_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer);
+	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
+	BOOL direction_in, ret;
+	struct winfd wfd;
+	DWORD flags;
+	HANDLE eventHandle;
+	PUKW_CONTROL_HEADER setup = NULL;
+	const BOOL control_transfer = transfer->type == LIBUSB_TRANSFER_TYPE_CONTROL;
+
+	transfer_priv->pollable_fd = INVALID_WINFD;
+	if (control_transfer) {
+		setup = (PUKW_CONTROL_HEADER) transfer->buffer;
+		direction_in = setup->bmRequestType & LIBUSB_ENDPOINT_IN;
+	} else {
+		direction_in = transfer->endpoint & LIBUSB_ENDPOINT_IN;
+	}
+	flags = direction_in ? UKW_TF_IN_TRANSFER : UKW_TF_OUT_TRANSFER;
+	flags |= UKW_TF_SHORT_TRANSFER_OK;
+
+	eventHandle = CreateEvent(NULL, FALSE, FALSE, NULL);
+	if (eventHandle == NULL) {
+		usbi_err(ctx, "Failed to create event for async transfer");
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	wfd = usbi_create_fd(eventHandle, direction_in ? RW_READ : RW_WRITE, itransfer, &wince_cancel_transfer);
+	if (wfd.fd < 0) {
+		CloseHandle(eventHandle);
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	transfer_priv->pollable_fd = wfd;
+	if (control_transfer) {
+		// Split out control setup header and data buffer
+		DWORD bufLen = transfer->length - sizeof(UKW_CONTROL_HEADER);
+		PVOID buf = (PVOID) &transfer->buffer[sizeof(UKW_CONTROL_HEADER)];
+
+		ret = UkwIssueControlTransfer(priv->dev, flags, setup, buf, bufLen, &transfer->actual_length, wfd.overlapped);
+	} else {
+		ret = UkwIssueBulkTransfer(priv->dev, flags, transfer->endpoint, transfer->buffer,
+			transfer->length, &transfer->actual_length, wfd.overlapped);
+	}
+
+	if (!ret) {
+		int libusbErr = translate_driver_error(GetLastError());
+		usbi_err(ctx, "UkwIssue%sTransfer failed: error %u",
+			control_transfer ? "Control" : "Bulk", (unsigned int)GetLastError());
+		wince_clear_transfer_priv(itransfer);
+		return libusbErr;
+	}
+	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, direction_in ? POLLIN : POLLOUT);
+
+	return LIBUSB_SUCCESS;
+}
+
+static int wince_submit_iso_transfer(struct usbi_transfer *itransfer)
+{
+	return LIBUSB_ERROR_NOT_SUPPORTED;
+}
+
+static int wince_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		return wince_submit_control_or_bulk_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		return wince_submit_iso_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	default:
+		usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+}
+
+static void wince_transfer_callback(
+	struct usbi_transfer *itransfer,
+	uint32_t io_result, uint32_t io_size)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct wince_transfer_priv *transfer_priv = (struct wince_transfer_priv*)usbi_transfer_get_os_priv(itransfer);
+	struct wince_device_priv *priv = _device_priv(transfer->dev_handle->dev);
+	int status;
+
+	usbi_dbg("handling I/O completion with errcode %u", io_result);
+
+	if (io_result == ERROR_NOT_SUPPORTED &&
+		transfer->type != LIBUSB_TRANSFER_TYPE_CONTROL) {
+		/* For functional stalls, the WinCE USB layer (and therefore the USB Kernel Wrapper
+		 * Driver) will report USB_ERROR_STALL/ERROR_NOT_SUPPORTED in situations where the
+		 * endpoint isn't actually stalled.
+		 *
+		 * One example of this is that some devices will occasionally fail to reply to an IN
+		 * token. The WinCE USB layer carries on with the transaction until it is completed
+		 * (or cancelled) but then completes it with USB_ERROR_STALL.
+		 *
+		 * This code therefore needs to confirm that there really is a stall error, by both
+		 * checking the pipe status and requesting the endpoint status from the device.
+		 */
+		BOOL halted = FALSE;
+		usbi_dbg("checking I/O completion with errcode ERROR_NOT_SUPPORTED is really a stall");
+		if (UkwIsPipeHalted(priv->dev, transfer->endpoint, &halted)) {
+			/* Pipe status retrieved, so now request endpoint status by sending a GET_STATUS
+			 * control request to the device. This is done synchronously, which is a bit
+			 * naughty, but this is a special corner case.
+			 */
+			WORD wStatus = 0;
+			DWORD written = 0;
+			UKW_CONTROL_HEADER ctrlHeader;
+			ctrlHeader.bmRequestType = LIBUSB_REQUEST_TYPE_STANDARD |
+				LIBUSB_ENDPOINT_IN | LIBUSB_RECIPIENT_ENDPOINT;
+			ctrlHeader.bRequest = LIBUSB_REQUEST_GET_STATUS;
+			ctrlHeader.wValue = 0;
+			ctrlHeader.wIndex = transfer->endpoint;
+			ctrlHeader.wLength = sizeof(wStatus);
+			if (UkwIssueControlTransfer(priv->dev,
+					UKW_TF_IN_TRANSFER | UKW_TF_SEND_TO_ENDPOINT,
+					&ctrlHeader, &wStatus, sizeof(wStatus), &written, NULL)) {
+				if (written == sizeof(wStatus) &&
+						(wStatus & STATUS_HALT_FLAG) == 0) {
+					if (!halted || UkwClearHaltHost(priv->dev, transfer->endpoint)) {
+						usbi_dbg("Endpoint doesn't appear to be stalled, overriding error with success");
+						io_result = ERROR_SUCCESS;
+					} else {
+						usbi_dbg("Endpoint doesn't appear to be stalled, but the host is halted, changing error");
+						io_result = ERROR_IO_DEVICE;
+					}
+				}
+			}
+		}
+	}
+
+	switch(io_result) {
+	case ERROR_SUCCESS:
+		itransfer->transferred += io_size;
+		status = LIBUSB_TRANSFER_COMPLETED;
+		break;
+	case ERROR_CANCELLED:
+		usbi_dbg("detected transfer cancel");
+		status = LIBUSB_TRANSFER_CANCELLED;
+		break;
+	case ERROR_NOT_SUPPORTED:
+	case ERROR_GEN_FAILURE:
+		usbi_dbg("detected endpoint stall");
+		status = LIBUSB_TRANSFER_STALL;
+		break;
+	case ERROR_SEM_TIMEOUT:
+		usbi_dbg("detected semaphore timeout");
+		status = LIBUSB_TRANSFER_TIMED_OUT;
+		break;
+	case ERROR_OPERATION_ABORTED:
+		usbi_dbg("detected operation aborted");
+		status = LIBUSB_TRANSFER_CANCELLED;
+		break;
+	default:
+		usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error: %s", windows_error_str(io_result));
+		status = LIBUSB_TRANSFER_ERROR;
+		break;
+	}
+
+	wince_clear_transfer_priv(itransfer);
+	if (status == LIBUSB_TRANSFER_CANCELLED)
+		usbi_handle_transfer_cancellation(itransfer);
+	else
+		usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
+}
+
+static void wince_handle_callback(
+	struct usbi_transfer *itransfer,
+	uint32_t io_result, uint32_t io_size)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		wince_transfer_callback (itransfer, io_result, io_size);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
+		break;
+	default:
+		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
+	}
+}
+
+static int wince_handle_events(
+	struct libusb_context *ctx,
+	struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
+{
+	struct wince_transfer_priv* transfer_priv = NULL;
+	POLL_NFDS_TYPE i = 0;
+	BOOL found = FALSE;
+	struct usbi_transfer *transfer;
+	DWORD io_size, io_result;
+	int r = LIBUSB_SUCCESS;
+
+	usbi_mutex_lock(&ctx->open_devs_lock);
+	for (i = 0; i < nfds && num_ready > 0; i++) {
+
+		usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
+
+		if (!fds[i].revents)
+			continue;
+
+		num_ready--;
+
+		// Because a Windows OVERLAPPED is used for poll emulation,
+		// a pollable fd is created and stored with each transfer
+		usbi_mutex_lock(&ctx->flying_transfers_lock);
+		list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
+			transfer_priv = usbi_transfer_get_os_priv(transfer);
+			if (transfer_priv->pollable_fd.fd == fds[i].fd) {
+				found = TRUE;
+				break;
+			}
+		}
+		usbi_mutex_unlock(&ctx->flying_transfers_lock);
+
+		if (found && HasOverlappedIoCompleted(transfer_priv->pollable_fd.overlapped)) {
+			io_result = (DWORD)transfer_priv->pollable_fd.overlapped->Internal;
+			io_size = (DWORD)transfer_priv->pollable_fd.overlapped->InternalHigh;
+			usbi_remove_pollfd(ctx, transfer_priv->pollable_fd.fd);
+			// let handle_callback free the event using the transfer wfd
+			// If you don't use the transfer wfd, you run a risk of trying to free a
+			// newly allocated wfd that took the place of the one from the transfer.
+			wince_handle_callback(transfer, io_result, io_size);
+		} else if (found) {
+			usbi_err(ctx, "matching transfer for fd %d has not completed", fds[i]);
+			r = LIBUSB_ERROR_OTHER;
+			break;
+		} else {
+			usbi_err(ctx, "could not find a matching transfer for fd %d", fds[i]);
+			r = LIBUSB_ERROR_NOT_FOUND;
+			break;
+		}
+	}
+	usbi_mutex_unlock(&ctx->open_devs_lock);
+
+	return r;
+}
+
+/*
+ * Monotonic and real time functions
+ */
+static int wince_clock_gettime(int clk_id, struct timespec *tp)
+{
+	LARGE_INTEGER hires_counter;
+	ULARGE_INTEGER rtime;
+	FILETIME filetime;
+	SYSTEMTIME st;
+
+	switch(clk_id) {
+	case USBI_CLOCK_MONOTONIC:
+		if (hires_frequency != 0 && QueryPerformanceCounter(&hires_counter)) {
+			tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
+			tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) / 1000) * hires_ticks_to_ps);
+			return LIBUSB_SUCCESS;
+		}
+		// Fall through and return real-time if monotonic read failed or was not detected @ init
+	case USBI_CLOCK_REALTIME:
+		// We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
+		// with a predef epoch time to have an epoch that starts at 1970.01.01 00:00
+		// Note however that our resolution is bounded by the Windows system time
+		// functions and is at best of the order of 1 ms (or, usually, worse)
+		GetSystemTime(&st);
+		SystemTimeToFileTime(&st, &filetime);
+		rtime.LowPart = filetime.dwLowDateTime;
+		rtime.HighPart = filetime.dwHighDateTime;
+		rtime.QuadPart -= EPOCH_TIME;
+		tp->tv_sec = (long)(rtime.QuadPart / 10000000);
+		tp->tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
+		return LIBUSB_SUCCESS;
+	default:
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+}
+
+const struct usbi_os_backend wince_backend = {
+	"Windows CE",
+	0,
+	wince_init,
+	wince_exit,
+
+	wince_get_device_list,
+	NULL,				/* hotplug_poll */
+	wince_open,
+	wince_close,
+
+	wince_get_device_descriptor,
+	wince_get_active_config_descriptor,
+	wince_get_config_descriptor,
+	NULL,				/* get_config_descriptor_by_value() */
+
+	wince_get_configuration,
+	wince_set_configuration,
+	wince_claim_interface,
+	wince_release_interface,
+
+	wince_set_interface_altsetting,
+	wince_clear_halt,
+	wince_reset_device,
+
+	NULL,				/* alloc_streams */
+	NULL,				/* free_streams */
+
+	NULL,				/* dev_mem_alloc() */
+	NULL,				/* dev_mem_free() */
+
+	wince_kernel_driver_active,
+	wince_detach_kernel_driver,
+	wince_attach_kernel_driver,
+
+	wince_destroy_device,
+
+	wince_submit_transfer,
+	wince_cancel_transfer,
+	wince_clear_transfer_priv,
+
+	wince_handle_events,
+	NULL,				/* handle_transfer_completion() */
+
+	wince_clock_gettime,
+	sizeof(struct wince_device_priv),
+	0,
+	sizeof(struct wince_transfer_priv),
+};

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/wince_usb.h

@@ -0,0 +1,126 @@
+/*
+ * Windows CE backend for libusb 1.0
+ * Copyright © 2011-2013 RealVNC Ltd.
+ * Portions taken from Windows backend, which is
+ * Copyright © 2009-2010 Pete Batard <pbatard@gmail.com>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#pragma once
+
+#include "windows_common.h"
+
+#include <windows.h>
+#include "poll_windows.h"
+
+#define MAX_DEVICE_COUNT            256
+
+// This is a modified dump of the types in the ceusbkwrapper.h library header
+// with functions transformed into extern pointers.
+//
+// This backend dynamically loads ceusbkwrapper.dll and doesn't include
+// ceusbkwrapper.h directly to simplify the build process. The kernel
+// side wrapper driver is built using the platform image build tools,
+// which makes it difficult to reference directly from the libusb build
+// system.
+struct UKW_DEVICE_PRIV;
+typedef struct UKW_DEVICE_PRIV *UKW_DEVICE;
+typedef UKW_DEVICE *PUKW_DEVICE, *LPUKW_DEVICE;
+
+typedef struct {
+	UINT8 bLength;
+	UINT8 bDescriptorType;
+	UINT16 bcdUSB;
+	UINT8 bDeviceClass;
+	UINT8 bDeviceSubClass;
+	UINT8 bDeviceProtocol;
+	UINT8 bMaxPacketSize0;
+	UINT16 idVendor;
+	UINT16 idProduct;
+	UINT16 bcdDevice;
+	UINT8 iManufacturer;
+	UINT8 iProduct;
+	UINT8 iSerialNumber;
+	UINT8 bNumConfigurations;
+} UKW_DEVICE_DESCRIPTOR, *PUKW_DEVICE_DESCRIPTOR, *LPUKW_DEVICE_DESCRIPTOR;
+
+typedef struct {
+	UINT8 bmRequestType;
+	UINT8 bRequest;
+	UINT16 wValue;
+	UINT16 wIndex;
+	UINT16 wLength;
+} UKW_CONTROL_HEADER, *PUKW_CONTROL_HEADER, *LPUKW_CONTROL_HEADER;
+
+// Collection of flags which can be used when issuing transfer requests
+/* Indicates that the transfer direction is 'in' */
+#define UKW_TF_IN_TRANSFER        0x00000001
+/* Indicates that the transfer direction is 'out' */
+#define UKW_TF_OUT_TRANSFER       0x00000000
+/* Specifies that the transfer should complete as soon as possible,
+ * even if no OVERLAPPED structure has been provided. */
+#define UKW_TF_NO_WAIT            0x00000100
+/* Indicates that transfers shorter than the buffer are ok */
+#define UKW_TF_SHORT_TRANSFER_OK  0x00000200
+#define UKW_TF_SEND_TO_DEVICE     0x00010000
+#define UKW_TF_SEND_TO_INTERFACE  0x00020000
+#define UKW_TF_SEND_TO_ENDPOINT   0x00040000
+/* Don't block when waiting for memory allocations */
+#define UKW_TF_DONT_BLOCK_FOR_MEM 0x00080000
+
+/* Value to use when dealing with configuration values, such as UkwGetConfigDescriptor, 
+ * to specify the currently active configuration for the device. */
+#define UKW_ACTIVE_CONFIGURATION -1
+
+DLL_DECLARE_HANDLE(ceusbkwrapper);
+DLL_DECLARE_FUNC(WINAPI, HANDLE, UkwOpenDriver, ());
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwGetDeviceList, (HANDLE, LPUKW_DEVICE, DWORD, LPDWORD));
+DLL_DECLARE_FUNC(WINAPI, void, UkwReleaseDeviceList, (HANDLE, LPUKW_DEVICE, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwGetDeviceAddress, (UKW_DEVICE, unsigned char*, unsigned char*, unsigned long*));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwGetDeviceDescriptor, (UKW_DEVICE, LPUKW_DEVICE_DESCRIPTOR));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwGetConfigDescriptor, (UKW_DEVICE, DWORD, LPVOID, DWORD, LPDWORD));
+DLL_DECLARE_FUNC(WINAPI, void, UkwCloseDriver, (HANDLE));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwCancelTransfer, (UKW_DEVICE, LPOVERLAPPED, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwIssueControlTransfer, (UKW_DEVICE, DWORD, LPUKW_CONTROL_HEADER, LPVOID, DWORD, LPDWORD, LPOVERLAPPED));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwClaimInterface, (UKW_DEVICE, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwReleaseInterface, (UKW_DEVICE, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwSetInterfaceAlternateSetting, (UKW_DEVICE, DWORD, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwClearHaltHost, (UKW_DEVICE, UCHAR));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwClearHaltDevice, (UKW_DEVICE, UCHAR));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwGetConfig, (UKW_DEVICE, PUCHAR));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwSetConfig, (UKW_DEVICE, UCHAR));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwResetDevice, (UKW_DEVICE));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwKernelDriverActive, (UKW_DEVICE, DWORD, PBOOL));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwAttachKernelDriver, (UKW_DEVICE, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwDetachKernelDriver, (UKW_DEVICE, DWORD));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwIssueBulkTransfer, (UKW_DEVICE, DWORD, UCHAR, LPVOID, DWORD, LPDWORD, LPOVERLAPPED));
+DLL_DECLARE_FUNC(WINAPI, BOOL, UkwIsPipeHalted, (UKW_DEVICE, UCHAR, LPBOOL));
+
+// Used to determine if an endpoint status really is halted on a failed transfer.
+#define STATUS_HALT_FLAG 0x1
+
+struct wince_device_priv {
+	UKW_DEVICE dev;
+	UKW_DEVICE_DESCRIPTOR desc;
+};
+
+struct wince_transfer_priv {
+	struct winfd pollable_fd;
+	uint8_t interface_number;
+};
+

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_common.h

@@ -0,0 +1,124 @@
+/*
+ * Windows backend common header for libusb 1.0
+ *
+ * This file brings together header code common between
+ * the desktop Windows and Windows CE backends.
+ * Copyright © 2012-2013 RealVNC Ltd.
+ * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+// Windows API default is uppercase - ugh!
+#if !defined(bool)
+#define bool BOOL
+#endif
+#if !defined(true)
+#define true TRUE
+#endif
+#if !defined(false)
+#define false FALSE
+#endif
+
+#define EPOCH_TIME	UINT64_C(116444736000000000)	// 1970.01.01 00:00:000 in MS Filetime
+
+#if defined(__CYGWIN__ )
+#define _stricmp strcasecmp
+#define _strdup strdup
+// _beginthreadex is MSVCRT => unavailable for cygwin. Fallback to using CreateThread
+#define _beginthreadex(a, b, c, d, e, f) CreateThread(a, b, (LPTHREAD_START_ROUTINE)c, d, e, (LPDWORD)f)
+#endif
+
+#define safe_free(p) do {if (p != NULL) {free((void *)p); p = NULL;}} while (0)
+
+#ifndef ARRAYSIZE
+#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
+#endif
+
+#define ERR_BUFFER_SIZE	256
+
+/*
+ * API macros - leveraged from libusb-win32 1.x
+ */
+#ifndef _WIN32_WCE
+#define DLL_STRINGIFY(s) #s
+#define DLL_LOAD_LIBRARY(name) LoadLibraryA(DLL_STRINGIFY(name))
+#else
+#define DLL_STRINGIFY(s) L#s
+#define DLL_LOAD_LIBRARY(name) LoadLibrary(DLL_STRINGIFY(name))
+#endif
+
+/*
+ * Macros for handling DLL themselves
+ */
+#define DLL_DECLARE_HANDLE(name)				\
+	static HMODULE __dll_##name##_handle = NULL
+
+#define DLL_GET_HANDLE(name)					\
+	do {							\
+		__dll_##name##_handle = DLL_LOAD_LIBRARY(name);	\
+		if (!__dll_##name##_handle)			\
+			return LIBUSB_ERROR_OTHER;		\
+	} while (0)
+
+#define DLL_FREE_HANDLE(name)					\
+	do {							\
+		if (__dll_##name##_handle) {			\
+			FreeLibrary(__dll_##name##_handle);	\
+			__dll_##name##_handle = NULL;		\
+		}						\
+	} while(0)
+
+
+/*
+ * Macros for handling functions within a DLL
+ */
+#define DLL_DECLARE_FUNC_PREFIXNAME(api, ret, prefixname, name, args)	\
+	typedef ret (api * __dll_##name##_func_t)args;			\
+	static __dll_##name##_func_t prefixname = NULL
+
+#define DLL_DECLARE_FUNC(api, ret, name, args)				\
+	DLL_DECLARE_FUNC_PREFIXNAME(api, ret, name, name, args)
+#define DLL_DECLARE_FUNC_PREFIXED(api, ret, prefix, name, args)		\
+	DLL_DECLARE_FUNC_PREFIXNAME(api, ret, prefix##name, name, args)
+
+#define DLL_LOAD_FUNC_PREFIXNAME(dll, prefixname, name, ret_on_failure)	\
+	do {								\
+		HMODULE h = __dll_##dll##_handle;			\
+		prefixname = (__dll_##name##_func_t)GetProcAddress(h,	\
+				DLL_STRINGIFY(name));			\
+		if (prefixname)						\
+			break;						\
+		prefixname = (__dll_##name##_func_t)GetProcAddress(h,	\
+				DLL_STRINGIFY(name) DLL_STRINGIFY(A));	\
+		if (prefixname)						\
+			break;						\
+		prefixname = (__dll_##name##_func_t)GetProcAddress(h,	\
+				DLL_STRINGIFY(name) DLL_STRINGIFY(W));	\
+		if (prefixname)						\
+			break;						\
+		if (ret_on_failure)					\
+			return LIBUSB_ERROR_NOT_FOUND;			\
+	} while(0)
+
+#define DLL_LOAD_FUNC(dll, name, ret_on_failure)			\
+	DLL_LOAD_FUNC_PREFIXNAME(dll, name, name, ret_on_failure)
+#define DLL_LOAD_FUNC_PREFIXED(dll, prefix, name, ret_on_failure)	\
+	DLL_LOAD_FUNC_PREFIXNAME(dll, prefix##name, name, ret_on_failure)

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_nt_common.c

@@ -0,0 +1,591 @@
+/*
+ * windows backend for libusb 1.0
+ * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * HID Reports IOCTLs inspired from HIDAPI by Alan Ott, Signal 11 Software
+ * Hash table functions adapted from glibc, by Ulrich Drepper et al.
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <inttypes.h>
+#include <process.h>
+#include <stdio.h>
+
+#include "libusbi.h"
+#include "windows_common.h"
+#include "windows_nt_common.h"
+
+// Global variables for clock_gettime mechanism
+static uint64_t hires_ticks_to_ps;
+static uint64_t hires_frequency;
+
+#define TIMER_REQUEST_RETRY_MS	100
+#define WM_TIMER_REQUEST	(WM_USER + 1)
+#define WM_TIMER_EXIT		(WM_USER + 2)
+
+// used for monotonic clock_gettime()
+struct timer_request {
+	struct timespec *tp;
+	HANDLE event;
+};
+
+// Timer thread
+static HANDLE timer_thread = NULL;
+static DWORD timer_thread_id = 0;
+
+/* User32 dependencies */
+DLL_DECLARE_HANDLE(User32);
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, GetMessageA, (LPMSG, HWND, UINT, UINT));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, PeekMessageA, (LPMSG, HWND, UINT, UINT, UINT));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, PostThreadMessageA, (DWORD, UINT, WPARAM, LPARAM));
+
+static unsigned __stdcall windows_clock_gettime_threaded(void *param);
+
+/*
+* Converts a windows error to human readable string
+* uses retval as errorcode, or, if 0, use GetLastError()
+*/
+#if defined(ENABLE_LOGGING)
+const char *windows_error_str(DWORD error_code)
+{
+	static char err_string[ERR_BUFFER_SIZE];
+
+	DWORD size;
+	int len;
+
+	if (error_code == 0)
+		error_code = GetLastError();
+
+	len = sprintf(err_string, "[%u] ", (unsigned int)error_code);
+
+	// Translate codes returned by SetupAPI. The ones we are dealing with are either
+	// in 0x0000xxxx or 0xE000xxxx and can be distinguished from standard error codes.
+	// See http://msdn.microsoft.com/en-us/library/windows/hardware/ff545011.aspx
+	switch (error_code & 0xE0000000) {
+	case 0:
+		error_code = HRESULT_FROM_WIN32(error_code); // Still leaves ERROR_SUCCESS unmodified
+		break;
+	case 0xE0000000:
+		error_code = 0x80000000 | (FACILITY_SETUPAPI << 16) | (error_code & 0x0000FFFF);
+		break;
+	default:
+		break;
+	}
+
+	size = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+			NULL, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+			&err_string[len], ERR_BUFFER_SIZE - len, NULL);
+	if (size == 0) {
+		DWORD format_error = GetLastError();
+		if (format_error)
+			snprintf(err_string, ERR_BUFFER_SIZE,
+				"Windows error code %u (FormatMessage error code %u)",
+				(unsigned int)error_code, (unsigned int)format_error);
+		else
+			snprintf(err_string, ERR_BUFFER_SIZE, "Unknown error code %u", (unsigned int)error_code);
+	} else {
+		// Remove CRLF from end of message, if present
+		size_t pos = len + size - 2;
+		if (err_string[pos] == '\r')
+			err_string[pos] = '\0';
+	}
+
+	return err_string;
+}
+#endif
+
+/* Hash table functions - modified From glibc 2.3.2:
+   [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986
+   [Knuth]            The Art of Computer Programming, part 3 (6.4)  */
+
+#define HTAB_SIZE 1021UL	// *MUST* be a prime number!!
+
+typedef struct htab_entry {
+	unsigned long used;
+	char *str;
+} htab_entry;
+
+static htab_entry *htab_table = NULL;
+static usbi_mutex_t htab_mutex = NULL;
+static unsigned long htab_filled;
+
+/* Before using the hash table we must allocate memory for it.
+   We allocate one element more as the found prime number says.
+   This is done for more effective indexing as explained in the
+   comment for the hash function.  */
+static bool htab_create(struct libusb_context *ctx)
+{
+	if (htab_table != NULL) {
+		usbi_err(ctx, "hash table already allocated");
+		return true;
+	}
+
+	// Create a mutex
+	usbi_mutex_init(&htab_mutex);
+
+	usbi_dbg("using %lu entries hash table", HTAB_SIZE);
+	htab_filled = 0;
+
+	// allocate memory and zero out.
+	htab_table = calloc(HTAB_SIZE + 1, sizeof(htab_entry));
+	if (htab_table == NULL) {
+		usbi_err(ctx, "could not allocate space for hash table");
+		return false;
+	}
+
+	return true;
+}
+
+/* After using the hash table it has to be destroyed.  */
+static void htab_destroy(void)
+{
+	unsigned long i;
+
+	if (htab_table == NULL)
+		return;
+
+	for (i = 0; i < HTAB_SIZE; i++)
+		free(htab_table[i].str);
+
+	safe_free(htab_table);
+
+	usbi_mutex_destroy(&htab_mutex);
+}
+
+/* This is the search function. It uses double hashing with open addressing.
+   We use a trick to speed up the lookup. The table is created with one
+   more element available. This enables us to use the index zero special.
+   This index will never be used because we store the first hash index in
+   the field used where zero means not used. Every other value means used.
+   The used field can be used as a first fast comparison for equality of
+   the stored and the parameter value. This helps to prevent unnecessary
+   expensive calls of strcmp.  */
+unsigned long htab_hash(const char *str)
+{
+	unsigned long hval, hval2;
+	unsigned long idx;
+	unsigned long r = 5381;
+	int c;
+	const char *sz = str;
+
+	if (str == NULL)
+		return 0;
+
+	// Compute main hash value (algorithm suggested by Nokia)
+	while ((c = *sz++) != 0)
+		r = ((r << 5) + r) + c;
+	if (r == 0)
+		++r;
+
+	// compute table hash: simply take the modulus
+	hval = r % HTAB_SIZE;
+	if (hval == 0)
+		++hval;
+
+	// Try the first index
+	idx = hval;
+
+	// Mutually exclusive access (R/W lock would be better)
+	usbi_mutex_lock(&htab_mutex);
+
+	if (htab_table[idx].used) {
+		if ((htab_table[idx].used == hval) && (strcmp(str, htab_table[idx].str) == 0))
+			goto out_unlock; // existing hash
+
+		usbi_dbg("hash collision ('%s' vs '%s')", str, htab_table[idx].str);
+
+		// Second hash function, as suggested in [Knuth]
+		hval2 = 1 + hval % (HTAB_SIZE - 2);
+
+		do {
+			// Because size is prime this guarantees to step through all available indexes
+			if (idx <= hval2)
+				idx = HTAB_SIZE + idx - hval2;
+			else
+				idx -= hval2;
+
+			// If we visited all entries leave the loop unsuccessfully
+			if (idx == hval)
+				break;
+
+			// If entry is found use it.
+			if ((htab_table[idx].used == hval) && (strcmp(str, htab_table[idx].str) == 0))
+				goto out_unlock;
+		} while (htab_table[idx].used);
+	}
+
+	// Not found => New entry
+
+	// If the table is full return an error
+	if (htab_filled >= HTAB_SIZE) {
+		usbi_err(NULL, "hash table is full (%lu entries)", HTAB_SIZE);
+		idx = 0;
+		goto out_unlock;
+	}
+
+	htab_table[idx].str = _strdup(str);
+	if (htab_table[idx].str == NULL) {
+		usbi_err(NULL, "could not duplicate string for hash table");
+		idx = 0;
+		goto out_unlock;
+	}
+
+	htab_table[idx].used = hval;
+	++htab_filled;
+
+out_unlock:
+	usbi_mutex_unlock(&htab_mutex);
+
+	return idx;
+}
+
+static int windows_init_dlls(void)
+{
+	DLL_GET_HANDLE(User32);
+	DLL_LOAD_FUNC_PREFIXED(User32, p, GetMessageA, TRUE);
+	DLL_LOAD_FUNC_PREFIXED(User32, p, PeekMessageA, TRUE);
+	DLL_LOAD_FUNC_PREFIXED(User32, p, PostThreadMessageA, TRUE);
+
+	return LIBUSB_SUCCESS;
+}
+
+static void windows_exit_dlls(void)
+{
+	DLL_FREE_HANDLE(User32);
+}
+
+static bool windows_init_clock(struct libusb_context *ctx)
+{
+	DWORD_PTR affinity, dummy;
+	HANDLE event = NULL;
+	LARGE_INTEGER li_frequency;
+	int i;
+
+	if (QueryPerformanceFrequency(&li_frequency)) {
+		// Load DLL imports
+		if (windows_init_dlls() != LIBUSB_SUCCESS) {
+			usbi_err(ctx, "could not resolve DLL functions");
+			return false;
+		}
+
+		// The hires frequency can go as high as 4 GHz, so we'll use a conversion
+		// to picoseconds to compute the tv_nsecs part in clock_gettime
+		hires_frequency = li_frequency.QuadPart;
+		hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
+		usbi_dbg("hires timer available (Frequency: %"PRIu64" Hz)", hires_frequency);
+
+		// Because QueryPerformanceCounter might report different values when
+		// running on different cores, we create a separate thread for the timer
+		// calls, which we glue to the first available core always to prevent timing discrepancies.
+		if (!GetProcessAffinityMask(GetCurrentProcess(), &affinity, &dummy) || (affinity == 0)) {
+			usbi_err(ctx, "could not get process affinity: %s", windows_error_str(0));
+			return false;
+		}
+
+		// The process affinity mask is a bitmask where each set bit represents a core on
+		// which this process is allowed to run, so we find the first set bit
+		for (i = 0; !(affinity & (DWORD_PTR)(1 << i)); i++);
+		affinity = (DWORD_PTR)(1 << i);
+
+		usbi_dbg("timer thread will run on core #%d", i);
+
+		event = CreateEvent(NULL, FALSE, FALSE, NULL);
+		if (event == NULL) {
+			usbi_err(ctx, "could not create event: %s", windows_error_str(0));
+			return false;
+		}
+
+		timer_thread = (HANDLE)_beginthreadex(NULL, 0, windows_clock_gettime_threaded, (void *)event,
+				0, (unsigned int *)&timer_thread_id);
+		if (timer_thread == NULL) {
+			usbi_err(ctx, "unable to create timer thread - aborting");
+			CloseHandle(event);
+			return false;
+		}
+
+		if (!SetThreadAffinityMask(timer_thread, affinity))
+			usbi_warn(ctx, "unable to set timer thread affinity, timer discrepancies may arise");
+
+		// Wait for timer thread to init before continuing.
+		if (WaitForSingleObject(event, INFINITE) != WAIT_OBJECT_0) {
+			usbi_err(ctx, "failed to wait for timer thread to become ready - aborting");
+			CloseHandle(event);
+			return false;
+		}
+
+		CloseHandle(event);
+	} else {
+		usbi_dbg("no hires timer available on this platform");
+		hires_frequency = 0;
+		hires_ticks_to_ps = UINT64_C(0);
+	}
+
+	return true;
+}
+
+void windows_destroy_clock(void)
+{
+	if (timer_thread) {
+		// actually the signal to quit the thread.
+		if (!pPostThreadMessageA(timer_thread_id, WM_TIMER_EXIT, 0, 0)
+				|| (WaitForSingleObject(timer_thread, INFINITE) != WAIT_OBJECT_0)) {
+			usbi_dbg("could not wait for timer thread to quit");
+			TerminateThread(timer_thread, 1);
+			// shouldn't happen, but we're destroying
+			// all objects it might have held anyway.
+		}
+		CloseHandle(timer_thread);
+		timer_thread = NULL;
+		timer_thread_id = 0;
+	}
+}
+
+/*
+* Monotonic and real time functions
+*/
+static unsigned __stdcall windows_clock_gettime_threaded(void *param)
+{
+	struct timer_request *request;
+	LARGE_INTEGER hires_counter;
+	MSG msg;
+
+	// The following call will create this thread's message queue
+	// See https://msdn.microsoft.com/en-us/library/windows/desktop/ms644946.aspx
+	pPeekMessageA(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
+
+	// Signal windows_init_clock() that we're ready to service requests
+	if (!SetEvent((HANDLE)param))
+		usbi_dbg("SetEvent failed for timer init event: %s", windows_error_str(0));
+	param = NULL;
+
+	// Main loop - wait for requests
+	while (1) {
+		if (pGetMessageA(&msg, NULL, WM_TIMER_REQUEST, WM_TIMER_EXIT) == -1) {
+			usbi_err(NULL, "GetMessage failed for timer thread: %s", windows_error_str(0));
+			return 1;
+		}
+
+		switch (msg.message) {
+		case WM_TIMER_REQUEST:
+			// Requests to this thread are for hires always
+			// Microsoft says that this function always succeeds on XP and later
+			// See https://msdn.microsoft.com/en-us/library/windows/desktop/ms644904.aspx
+			request = (struct timer_request *)msg.lParam;
+			QueryPerformanceCounter(&hires_counter);
+			request->tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
+			request->tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) / 1000) * hires_ticks_to_ps);
+			if (!SetEvent(request->event))
+				usbi_err(NULL, "SetEvent failed for timer request: %s", windows_error_str(0));
+			break;
+		case WM_TIMER_EXIT:
+			usbi_dbg("timer thread quitting");
+			return 0;
+		}
+	}
+}
+
+int windows_clock_gettime(int clk_id, struct timespec *tp)
+{
+	struct timer_request request;
+#if !defined(_MSC_VER) || (_MSC_VER < 1900)
+	FILETIME filetime;
+	ULARGE_INTEGER rtime;
+#endif
+	DWORD r;
+
+	switch (clk_id) {
+	case USBI_CLOCK_MONOTONIC:
+		if (timer_thread) {
+			request.tp = tp;
+			request.event = CreateEvent(NULL, FALSE, FALSE, NULL);
+			if (request.event == NULL)
+				return LIBUSB_ERROR_NO_MEM;
+
+			if (!pPostThreadMessageA(timer_thread_id, WM_TIMER_REQUEST, 0, (LPARAM)&request)) {
+				usbi_err(NULL, "PostThreadMessage failed for timer thread: %s", windows_error_str(0));
+				CloseHandle(request.event);
+				return LIBUSB_ERROR_OTHER;
+			}
+
+			do {
+				r = WaitForSingleObject(request.event, TIMER_REQUEST_RETRY_MS);
+				if (r == WAIT_TIMEOUT)
+					usbi_dbg("could not obtain a timer value within reasonable timeframe - too much load?");
+				else if (r == WAIT_FAILED)
+					usbi_err(NULL, "WaitForSingleObject failed: %s", windows_error_str(0));
+			} while (r == WAIT_TIMEOUT);
+			CloseHandle(request.event);
+
+			if (r == WAIT_OBJECT_0)
+				return LIBUSB_SUCCESS;
+			else
+				return LIBUSB_ERROR_OTHER;
+		}
+		// Fall through and return real-time if monotonic was not detected @ timer init
+	case USBI_CLOCK_REALTIME:
+#if defined(_MSC_VER) && (_MSC_VER >= 1900)
+		timespec_get(tp, TIME_UTC);
+#else
+		// We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
+		// with a predef epoch time to have an epoch that starts at 1970.01.01 00:00
+		// Note however that our resolution is bounded by the Windows system time
+		// functions and is at best of the order of 1 ms (or, usually, worse)
+		GetSystemTimeAsFileTime(&filetime);
+		rtime.LowPart = filetime.dwLowDateTime;
+		rtime.HighPart = filetime.dwHighDateTime;
+		rtime.QuadPart -= EPOCH_TIME;
+		tp->tv_sec = (long)(rtime.QuadPart / 10000000);
+		tp->tv_nsec = (long)((rtime.QuadPart % 10000000) * 100);
+#endif
+		return LIBUSB_SUCCESS;
+	default:
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+}
+
+static void windows_transfer_callback(struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
+{
+	int status, istatus;
+
+	usbi_dbg("handling I/O completion with errcode %u, size %u", io_result, io_size);
+
+	switch (io_result) {
+	case NO_ERROR:
+		status = windows_copy_transfer_data(itransfer, io_size);
+		break;
+	case ERROR_GEN_FAILURE:
+		usbi_dbg("detected endpoint stall");
+		status = LIBUSB_TRANSFER_STALL;
+		break;
+	case ERROR_SEM_TIMEOUT:
+		usbi_dbg("detected semaphore timeout");
+		status = LIBUSB_TRANSFER_TIMED_OUT;
+		break;
+	case ERROR_OPERATION_ABORTED:
+		istatus = windows_copy_transfer_data(itransfer, io_size);
+		if (istatus != LIBUSB_TRANSFER_COMPLETED)
+			usbi_dbg("Failed to copy partial data in aborted operation: %d", istatus);
+
+		usbi_dbg("detected operation aborted");
+		status = LIBUSB_TRANSFER_CANCELLED;
+		break;
+	default:
+		usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error %u: %s", io_result, windows_error_str(io_result));
+		status = LIBUSB_TRANSFER_ERROR;
+		break;
+	}
+	windows_clear_transfer_priv(itransfer);	// Cancel polling
+	if (status == LIBUSB_TRANSFER_CANCELLED)
+		usbi_handle_transfer_cancellation(itransfer);
+	else
+		usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
+}
+
+void windows_handle_callback(struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		windows_transfer_callback(itransfer, io_result, io_size);
+		break;
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
+		usbi_warn(ITRANSFER_CTX(itransfer), "bulk stream transfers are not yet supported on this platform");
+		break;
+	default:
+		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
+	}
+}
+
+int windows_handle_events(struct libusb_context *ctx, struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
+{
+	POLL_NFDS_TYPE i;
+	bool found = false;
+	struct usbi_transfer *transfer;
+	struct winfd *pollable_fd = NULL;
+	DWORD io_size, io_result;
+	int r = LIBUSB_SUCCESS;
+
+	usbi_mutex_lock(&ctx->open_devs_lock);
+	for (i = 0; i < nfds && num_ready > 0; i++) {
+
+		usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
+
+		if (!fds[i].revents)
+			continue;
+
+		num_ready--;
+
+		// Because a Windows OVERLAPPED is used for poll emulation,
+		// a pollable fd is created and stored with each transfer
+		usbi_mutex_lock(&ctx->flying_transfers_lock);
+		found = false;
+		list_for_each_entry(transfer, &ctx->flying_transfers, list, struct usbi_transfer) {
+			pollable_fd = windows_get_fd(transfer);
+			if (pollable_fd->fd == fds[i].fd) {
+				found = true;
+				break;
+			}
+		}
+		usbi_mutex_unlock(&ctx->flying_transfers_lock);
+
+		if (found) {
+			windows_get_overlapped_result(transfer, pollable_fd, &io_result, &io_size);
+
+			usbi_remove_pollfd(ctx, pollable_fd->fd);
+			// let handle_callback free the event using the transfer wfd
+			// If you don't use the transfer wfd, you run a risk of trying to free a
+			// newly allocated wfd that took the place of the one from the transfer.
+			windows_handle_callback(transfer, io_result, io_size);
+		} else {
+			usbi_err(ctx, "could not find a matching transfer for fd %d", fds[i]);
+			r = LIBUSB_ERROR_NOT_FOUND;
+			break;
+		}
+	}
+	usbi_mutex_unlock(&ctx->open_devs_lock);
+
+	return r;
+}
+
+int windows_common_init(struct libusb_context *ctx)
+{
+	if (!windows_init_clock(ctx))
+		goto error_roll_back;
+
+	if (!htab_create(ctx))
+		goto error_roll_back;
+
+	return LIBUSB_SUCCESS;
+
+error_roll_back:
+	windows_common_exit();
+	return LIBUSB_ERROR_NO_MEM;
+}
+
+void windows_common_exit(void)
+{
+	htab_destroy();
+	windows_destroy_clock();
+	windows_exit_dlls();
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_nt_common.h

@@ -0,0 +1,63 @@
+/*
+ * Windows backend common header for libusb 1.0
+ *
+ * This file brings together header code common between
+ * the desktop Windows backends.
+ * Copyright © 2012-2013 RealVNC Ltd.
+ * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+// Missing from MinGW
+#if !defined(FACILITY_SETUPAPI)
+#define FACILITY_SETUPAPI	15
+#endif
+
+typedef struct USB_CONFIGURATION_DESCRIPTOR {
+  UCHAR  bLength;
+  UCHAR  bDescriptorType;
+  USHORT wTotalLength;
+  UCHAR  bNumInterfaces;
+  UCHAR  bConfigurationValue;
+  UCHAR  iConfiguration;
+  UCHAR  bmAttributes;
+  UCHAR  MaxPower;
+} USB_CONFIGURATION_DESCRIPTOR, *PUSB_CONFIGURATION_DESCRIPTOR;
+
+typedef struct libusb_device_descriptor USB_DEVICE_DESCRIPTOR, *PUSB_DEVICE_DESCRIPTOR;
+
+int windows_common_init(struct libusb_context *ctx);
+void windows_common_exit(void);
+
+unsigned long htab_hash(const char *str);
+int windows_clock_gettime(int clk_id, struct timespec *tp);
+
+void windows_clear_transfer_priv(struct usbi_transfer *itransfer);
+int windows_copy_transfer_data(struct usbi_transfer *itransfer, uint32_t io_size);
+struct winfd *windows_get_fd(struct usbi_transfer *transfer);
+void windows_get_overlapped_result(struct usbi_transfer *transfer, struct winfd *pollable_fd, DWORD *io_result, DWORD *io_size);
+
+void windows_handle_callback(struct usbi_transfer *itransfer, uint32_t io_result, uint32_t io_size);
+int windows_handle_events(struct libusb_context *ctx, struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready);
+
+#if defined(ENABLE_LOGGING)
+const char *windows_error_str(DWORD error_code);
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_usbdk.c

@@ -0,0 +1,905 @@
+/*
+ * windows UsbDk backend for libusb 1.0
+ * Copyright © 2014 Red Hat, Inc.
+
+ * Authors:
+ * Dmitry Fleytman <dmitry@daynix.com>
+ * Pavel Gurvich <pavel@daynix.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#if defined(USE_USBDK)
+
+#include <windows.h>
+#include <cfgmgr32.h>
+#include <stdio.h>
+
+#include "libusbi.h"
+#include "windows_common.h"
+#include "windows_nt_common.h"
+
+#define ULONG64 uint64_t
+#define PVOID64 uint64_t
+
+typedef CONST WCHAR *PCWCHAR;
+#define wcsncpy_s wcsncpy
+
+#include "windows_usbdk.h"
+
+#if !defined(STATUS_SUCCESS)
+typedef LONG NTSTATUS;
+#define STATUS_SUCCESS			((NTSTATUS)0x00000000L)
+#endif
+
+#if !defined(STATUS_CANCELLED)
+#define STATUS_CANCELLED		((NTSTATUS)0xC0000120L)
+#endif
+
+#if !defined(STATUS_REQUEST_CANCELED)
+#define STATUS_REQUEST_CANCELED		((NTSTATUS)0xC0000703L)
+#endif
+
+#if !defined(USBD_SUCCESS)
+typedef int32_t USBD_STATUS;
+#define USBD_SUCCESS(Status)		((USBD_STATUS) (Status) >= 0)
+#define USBD_PENDING(Status)		((ULONG) (Status) >> 30 == 1)
+#define USBD_ERROR(Status)		((USBD_STATUS) (Status) < 0)
+#define USBD_STATUS_STALL_PID		((USBD_STATUS) 0xc0000004)
+#define USBD_STATUS_ENDPOINT_HALTED	((USBD_STATUS) 0xc0000030)
+#define USBD_STATUS_BAD_START_FRAME	((USBD_STATUS) 0xc0000a00)
+#define USBD_STATUS_TIMEOUT		((USBD_STATUS) 0xc0006000)
+#define USBD_STATUS_CANCELED		((USBD_STATUS) 0xc0010000)
+#endif
+
+static int concurrent_usage = -1;
+
+struct usbdk_device_priv {
+	USB_DK_DEVICE_INFO info;
+	PUSB_CONFIGURATION_DESCRIPTOR *config_descriptors;
+	HANDLE redirector_handle;
+	uint8_t active_configuration;
+};
+
+struct usbdk_transfer_priv {
+	USB_DK_TRANSFER_REQUEST request;
+	struct winfd pollable_fd;
+	PULONG64 IsochronousPacketsArray;
+	PUSB_DK_ISO_TRANSFER_RESULT IsochronousResultsArray;
+};
+
+static inline struct usbdk_device_priv *_usbdk_device_priv(struct libusb_device *dev)
+{
+	return (struct usbdk_device_priv *)dev->os_priv;
+}
+
+static inline struct usbdk_transfer_priv *_usbdk_transfer_priv(struct usbi_transfer *itransfer)
+{
+	return (struct usbdk_transfer_priv *)usbi_transfer_get_os_priv(itransfer);
+}
+
+static struct {
+	HMODULE module;
+
+	USBDK_GET_DEVICES_LIST			GetDevicesList;
+	USBDK_RELEASE_DEVICES_LIST		ReleaseDevicesList;
+	USBDK_START_REDIRECT			StartRedirect;
+	USBDK_STOP_REDIRECT			StopRedirect;
+	USBDK_GET_CONFIGURATION_DESCRIPTOR	GetConfigurationDescriptor;
+	USBDK_RELEASE_CONFIGURATION_DESCRIPTOR	ReleaseConfigurationDescriptor;
+	USBDK_READ_PIPE				ReadPipe;
+	USBDK_WRITE_PIPE			WritePipe;
+	USBDK_ABORT_PIPE			AbortPipe;
+	USBDK_RESET_PIPE			ResetPipe;
+	USBDK_SET_ALTSETTING			SetAltsetting;
+	USBDK_RESET_DEVICE			ResetDevice;
+	USBDK_GET_REDIRECTOR_SYSTEM_HANDLE	GetRedirectorSystemHandle;
+} usbdk_helper;
+
+static FARPROC get_usbdk_proc_addr(struct libusb_context *ctx, LPCSTR api_name)
+{
+	FARPROC api_ptr = GetProcAddress(usbdk_helper.module, api_name);
+
+	if (api_ptr == NULL)
+		usbi_err(ctx, "UsbDkHelper API %s not found, error %d", api_name, GetLastError());
+
+	return api_ptr;
+}
+
+static void unload_usbdk_helper_dll(void)
+{
+	if (usbdk_helper.module != NULL) {
+		FreeLibrary(usbdk_helper.module);
+		usbdk_helper.module = NULL;
+	}
+}
+
+static int load_usbdk_helper_dll(struct libusb_context *ctx)
+{
+	usbdk_helper.module = LoadLibraryA("UsbDkHelper");
+	if (usbdk_helper.module == NULL) {
+		usbi_err(ctx, "Failed to load UsbDkHelper.dll, error %d", GetLastError());
+		return LIBUSB_ERROR_NOT_FOUND;
+	}
+
+	usbdk_helper.GetDevicesList = (USBDK_GET_DEVICES_LIST)get_usbdk_proc_addr(ctx, "UsbDk_GetDevicesList");
+	if (usbdk_helper.GetDevicesList == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReleaseDevicesList = (USBDK_RELEASE_DEVICES_LIST)get_usbdk_proc_addr(ctx, "UsbDk_ReleaseDevicesList");
+	if (usbdk_helper.ReleaseDevicesList == NULL)
+		goto error_unload;
+
+	usbdk_helper.StartRedirect = (USBDK_START_REDIRECT)get_usbdk_proc_addr(ctx, "UsbDk_StartRedirect");
+	if (usbdk_helper.StartRedirect == NULL)
+		goto error_unload;
+
+	usbdk_helper.StopRedirect = (USBDK_STOP_REDIRECT)get_usbdk_proc_addr(ctx, "UsbDk_StopRedirect");
+	if (usbdk_helper.StopRedirect == NULL)
+		goto error_unload;
+
+	usbdk_helper.GetConfigurationDescriptor = (USBDK_GET_CONFIGURATION_DESCRIPTOR)get_usbdk_proc_addr(ctx, "UsbDk_GetConfigurationDescriptor");
+	if (usbdk_helper.GetConfigurationDescriptor == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReleaseConfigurationDescriptor = (USBDK_RELEASE_CONFIGURATION_DESCRIPTOR)get_usbdk_proc_addr(ctx, "UsbDk_ReleaseConfigurationDescriptor");
+	if (usbdk_helper.ReleaseConfigurationDescriptor == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReadPipe = (USBDK_READ_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_ReadPipe");
+	if (usbdk_helper.ReadPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.WritePipe = (USBDK_WRITE_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_WritePipe");
+	if (usbdk_helper.WritePipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.AbortPipe = (USBDK_ABORT_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_AbortPipe");
+	if (usbdk_helper.AbortPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.ResetPipe = (USBDK_RESET_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_ResetPipe");
+	if (usbdk_helper.ResetPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.SetAltsetting = (USBDK_SET_ALTSETTING)get_usbdk_proc_addr(ctx, "UsbDk_SetAltsetting");
+	if (usbdk_helper.SetAltsetting == NULL)
+		goto error_unload;
+
+	usbdk_helper.ResetDevice = (USBDK_RESET_DEVICE)get_usbdk_proc_addr(ctx, "UsbDk_ResetDevice");
+	if (usbdk_helper.ResetDevice == NULL)
+		goto error_unload;
+
+	usbdk_helper.GetRedirectorSystemHandle = (USBDK_GET_REDIRECTOR_SYSTEM_HANDLE)get_usbdk_proc_addr(ctx, "UsbDk_GetRedirectorSystemHandle");
+	if (usbdk_helper.GetRedirectorSystemHandle == NULL)
+		goto error_unload;
+
+	return LIBUSB_SUCCESS;
+
+error_unload:
+	FreeLibrary(usbdk_helper.module);
+	usbdk_helper.module = NULL;
+	return LIBUSB_ERROR_NOT_FOUND;
+}
+
+static int usbdk_init(struct libusb_context *ctx)
+{
+	int r;
+
+	if (++concurrent_usage == 0) { // First init?
+		r = load_usbdk_helper_dll(ctx);
+		if (r)
+			goto init_exit;
+
+		init_polling();
+
+		r = windows_common_init(ctx);
+		if (r)
+			goto init_exit;
+	}
+	// At this stage, either we went through full init successfully, or didn't need to
+	r = LIBUSB_SUCCESS;
+
+init_exit:
+	if (!concurrent_usage && r != LIBUSB_SUCCESS) { // First init failed?
+		exit_polling();
+		windows_common_exit();
+		unload_usbdk_helper_dll();
+	}
+
+	if (r != LIBUSB_SUCCESS)
+		--concurrent_usage; // Not expected to call libusb_exit if we failed.
+
+	return r;
+}
+
+static int usbdk_get_session_id_for_device(struct libusb_context *ctx,
+	PUSB_DK_DEVICE_ID id, unsigned long *session_id)
+{
+	char dev_identity[ARRAYSIZE(id->DeviceID) + ARRAYSIZE(id->InstanceID)];
+
+	if (sprintf(dev_identity, "%S%S", id->DeviceID, id->InstanceID) == -1) {
+		usbi_warn(ctx, "cannot form device identity", id->DeviceID);
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	}
+
+	*session_id = htab_hash(dev_identity);
+
+	return LIBUSB_SUCCESS;
+}
+
+static void usbdk_release_config_descriptors(struct usbdk_device_priv *p, uint8_t count)
+{
+	uint8_t i;
+
+	for (i = 0; i < count; i++)
+		usbdk_helper.ReleaseConfigurationDescriptor(p->config_descriptors[i]);
+
+	free(p->config_descriptors);
+	p->config_descriptors = NULL;
+}
+
+static int usbdk_cache_config_descriptors(struct libusb_context *ctx,
+	struct usbdk_device_priv *p, PUSB_DK_DEVICE_INFO info)
+{
+	uint8_t i;
+	USB_DK_CONFIG_DESCRIPTOR_REQUEST Request;
+	Request.ID = info->ID;
+
+	p->config_descriptors = calloc(info->DeviceDescriptor.bNumConfigurations, sizeof(PUSB_CONFIGURATION_DESCRIPTOR));
+	if (p->config_descriptors == NULL) {
+		usbi_err(ctx, "failed to allocate configuration descriptors holder");
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	for (i = 0; i < info->DeviceDescriptor.bNumConfigurations; i++) {
+		ULONG Length;
+
+		Request.Index = i;
+		if (!usbdk_helper.GetConfigurationDescriptor(&Request, &p->config_descriptors[i], &Length)) {
+			usbi_err(ctx, "failed to retrieve configuration descriptors");
+			usbdk_release_config_descriptors(p, i);
+			return LIBUSB_ERROR_OTHER;
+		}
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static inline int usbdk_device_priv_init(struct libusb_context *ctx, struct libusb_device *dev, PUSB_DK_DEVICE_INFO info)
+{
+	struct usbdk_device_priv *p = _usbdk_device_priv(dev);
+
+	p->info = *info;
+	p->active_configuration = 0;
+
+	return usbdk_cache_config_descriptors(ctx, p, info);
+}
+
+static void usbdk_device_init(libusb_device *dev, PUSB_DK_DEVICE_INFO info)
+{
+	dev->bus_number = (uint8_t)info->FilterID;
+	dev->port_number = (uint8_t)info->Port;
+	dev->parent_dev = NULL;
+
+	//Addresses in libusb are 1-based
+	dev->device_address = (uint8_t)(info->Port + 1);
+
+	dev->num_configurations = info->DeviceDescriptor.bNumConfigurations;
+	dev->device_descriptor = info->DeviceDescriptor;
+
+	switch (info->Speed) {
+	case LowSpeed:
+		dev->speed = LIBUSB_SPEED_LOW;
+		break;
+	case FullSpeed:
+		dev->speed = LIBUSB_SPEED_FULL;
+		break;
+	case HighSpeed:
+		dev->speed = LIBUSB_SPEED_HIGH;
+		break;
+	case SuperSpeed:
+		dev->speed = LIBUSB_SPEED_SUPER;
+		break;
+	case NoSpeed:
+	default:
+		dev->speed = LIBUSB_SPEED_UNKNOWN;
+		break;
+	}
+}
+
+static int usbdk_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs)
+{
+	int r = LIBUSB_SUCCESS;
+	ULONG i;
+	struct discovered_devs *discdevs = NULL;
+	ULONG dev_number;
+	PUSB_DK_DEVICE_INFO devices;
+
+	if(!usbdk_helper.GetDevicesList(&devices, &dev_number))
+		return LIBUSB_ERROR_OTHER;
+
+	for (i = 0; i < dev_number; i++) {
+		unsigned long session_id;
+		struct libusb_device *dev = NULL;
+
+		if (usbdk_get_session_id_for_device(ctx, &devices[i].ID, &session_id))
+			continue;
+
+		dev = usbi_get_device_by_session_id(ctx, session_id);
+		if (dev == NULL) {
+			dev = usbi_alloc_device(ctx, session_id);
+			if (dev == NULL) {
+				usbi_err(ctx, "failed to allocate a new device structure");
+				continue;
+			}
+
+			usbdk_device_init(dev, &devices[i]);
+			if (usbdk_device_priv_init(ctx, dev, &devices[i]) != LIBUSB_SUCCESS) {
+				libusb_unref_device(dev);
+				continue;
+			}
+		}
+
+		discdevs = discovered_devs_append(*_discdevs, dev);
+		libusb_unref_device(dev);
+		if (!discdevs) {
+			usbi_err(ctx, "cannot append new device to list");
+			r = LIBUSB_ERROR_NO_MEM;
+			goto func_exit;
+		}
+
+		*_discdevs = discdevs;
+	}
+
+func_exit:
+	usbdk_helper.ReleaseDevicesList(devices);
+	return r;
+}
+
+static void usbdk_exit(void)
+{
+	if (--concurrent_usage < 0) {
+		windows_common_exit();
+		exit_polling();
+		unload_usbdk_helper_dll();
+	}
+}
+
+static int usbdk_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer, int *host_endian)
+{
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev);
+
+	memcpy(buffer, &priv->info.DeviceDescriptor, DEVICE_DESC_LENGTH);
+	*host_endian = 0;
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
+{
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev);
+	PUSB_CONFIGURATION_DESCRIPTOR config_header;
+	size_t size;
+
+	if (config_index >= dev->num_configurations)
+		return LIBUSB_ERROR_INVALID_PARAM;
+
+	config_header = (PUSB_CONFIGURATION_DESCRIPTOR)priv->config_descriptors[config_index];
+
+	size = min(config_header->wTotalLength, len);
+	memcpy(buffer, config_header, size);
+	*host_endian = 0;
+
+	return (int)size;
+}
+
+static inline int usbdk_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian)
+{
+	return usbdk_get_config_descriptor(dev, _usbdk_device_priv(dev)->active_configuration,
+			buffer, len, host_endian);
+}
+
+static int usbdk_open(struct libusb_device_handle *dev_handle)
+{
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev_handle->dev);
+
+	priv->redirector_handle = usbdk_helper.StartRedirect(&priv->info.ID);
+	if (priv->redirector_handle == INVALID_HANDLE_VALUE) {
+		usbi_err(DEVICE_CTX(dev_handle->dev), "Redirector startup failed");
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static void usbdk_close(struct libusb_device_handle *dev_handle)
+{
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.StopRedirect(priv->redirector_handle)) {
+		struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
+		usbi_err(ctx, "Redirector shutdown failed");
+	}
+}
+
+static int usbdk_get_configuration(struct libusb_device_handle *dev_handle, int *config)
+{
+	*config = _usbdk_device_priv(dev_handle->dev)->active_configuration;
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_set_configuration(struct libusb_device_handle *dev_handle, int config)
+{
+	UNUSED(dev_handle);
+	UNUSED(config);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_claim_interface(struct libusb_device_handle *dev_handle, int iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting)
+{
+	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.SetAltsetting(priv->redirector_handle, iface, altsetting)) {
+		usbi_err(ctx, "SetAltsetting failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_release_interface(struct libusb_device_handle *dev_handle, int iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint)
+{
+	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.ResetPipe(priv->redirector_handle, endpoint)) {
+		usbi_err(ctx, "ResetPipe failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_reset_device(struct libusb_device_handle *dev_handle)
+{
+	struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.ResetDevice(priv->redirector_handle)) {
+		usbi_err(ctx, "ResetDevice failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_kernel_driver_active(struct libusb_device_handle *dev_handle, int iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_ERROR_NOT_SUPPORTED;
+}
+
+static int usbdk_attach_kernel_driver(struct libusb_device_handle *dev_handle, int iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_ERROR_NOT_SUPPORTED;
+}
+
+static int usbdk_detach_kernel_driver(struct libusb_device_handle *dev_handle, int iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_ERROR_NOT_SUPPORTED;
+}
+
+static void usbdk_destroy_device(struct libusb_device *dev)
+{
+	struct usbdk_device_priv* p = _usbdk_device_priv(dev);
+
+	if (p->config_descriptors != NULL)
+		usbdk_release_config_descriptors(p, p->info.DeviceDescriptor.bNumConfigurations);
+}
+
+void windows_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(itransfer);
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	usbi_free_fd(&transfer_priv->pollable_fd);
+
+	if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+		safe_free(transfer_priv->IsochronousPacketsArray);
+		safe_free(transfer_priv->IsochronousResultsArray);
+	}
+}
+
+static int usbdk_do_control_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct winfd wfd;
+	ULONG Length;
+	TransferResult transResult;
+	HANDLE sysHandle;
+
+	sysHandle = usbdk_helper.GetRedirectorSystemHandle(priv->redirector_handle);
+
+	wfd = usbi_create_fd(sysHandle, RW_READ, NULL, NULL);
+	// Always use the handle returned from usbi_create_fd (wfd.handle)
+	if (wfd.fd < 0)
+		return LIBUSB_ERROR_NO_MEM;
+
+	transfer_priv->request.Buffer = (PVOID64)(uintptr_t)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.TransferType = ControlTransferType;
+	transfer_priv->pollable_fd = INVALID_WINFD;
+	Length = (ULONG)transfer->length;
+
+	if (IS_XFERIN(transfer))
+		transResult = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+	else
+		transResult = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+
+	switch (transResult) {
+	case TransferSuccess:
+		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
+		wfd.overlapped->InternalHigh = (DWORD)Length;
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		usbi_err(ctx, "ControlTransfer failed: %s", windows_error_str(0));
+		usbi_free_fd(&wfd);
+		return LIBUSB_ERROR_IO;
+	}
+
+	// Use priv_transfer to store data needed for async polling
+	transfer_priv->pollable_fd = wfd;
+	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, POLLIN);
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_do_bulk_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct winfd wfd;
+	TransferResult transferRes;
+	HANDLE sysHandle;
+
+	transfer_priv->request.Buffer = (PVOID64)(uintptr_t)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.EndpointAddress = transfer->endpoint;
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_BULK:
+		transfer_priv->request.TransferType = BulkTransferType;
+		break;
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		transfer_priv->request.TransferType = IntertuptTransferType;
+		break;
+	default:
+		usbi_err(ctx, "Wrong transfer type (%d) in usbdk_do_bulk_transfer. %s", transfer->type, windows_error_str(0));
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+
+	transfer_priv->pollable_fd = INVALID_WINFD;
+
+	sysHandle = usbdk_helper.GetRedirectorSystemHandle(priv->redirector_handle);
+
+	wfd = usbi_create_fd(sysHandle, IS_XFERIN(transfer) ? RW_READ : RW_WRITE, NULL, NULL);
+	// Always use the handle returned from usbi_create_fd (wfd.handle)
+	if (wfd.fd < 0)
+		return LIBUSB_ERROR_NO_MEM;
+
+	if (IS_XFERIN(transfer))
+		transferRes = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+	else
+		transferRes = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+
+	switch (transferRes) {
+	case TransferSuccess:
+		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		usbi_err(ctx, "ReadPipe/WritePipe failed: %s", windows_error_str(0));
+		usbi_free_fd(&wfd);
+		return LIBUSB_ERROR_IO;
+	}
+
+	transfer_priv->pollable_fd = wfd;
+	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, IS_XFERIN(transfer) ? POLLIN : POLLOUT);
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_do_iso_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct winfd wfd;
+	TransferResult transferRes;
+	int i;
+	HANDLE sysHandle;
+
+	transfer_priv->request.Buffer = (PVOID64)(uintptr_t)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.EndpointAddress = transfer->endpoint;
+	transfer_priv->request.TransferType = IsochronousTransferType;
+	transfer_priv->request.IsochronousPacketsArraySize = transfer->num_iso_packets;
+	transfer_priv->IsochronousPacketsArray = malloc(transfer->num_iso_packets * sizeof(ULONG64));
+	transfer_priv->request.IsochronousPacketsArray = (PVOID64)(uintptr_t)transfer_priv->IsochronousPacketsArray;
+	if (!transfer_priv->IsochronousPacketsArray) {
+		usbi_err(ctx, "Allocation of IsochronousPacketsArray is failed, %s", windows_error_str(0));
+		return LIBUSB_ERROR_IO;
+	}
+
+	transfer_priv->IsochronousResultsArray = malloc(transfer->num_iso_packets * sizeof(USB_DK_ISO_TRANSFER_RESULT));
+	transfer_priv->request.Result.IsochronousResultsArray = (PVOID64)(uintptr_t)transfer_priv->IsochronousResultsArray;
+	if (!transfer_priv->IsochronousResultsArray) {
+		usbi_err(ctx, "Allocation of isochronousResultsArray is failed, %s", windows_error_str(0));
+		free(transfer_priv->IsochronousPacketsArray);
+		return LIBUSB_ERROR_IO;
+	}
+
+	for (i = 0; i < transfer->num_iso_packets; i++)
+		transfer_priv->IsochronousPacketsArray[i] = transfer->iso_packet_desc[i].length;
+
+	transfer_priv->pollable_fd = INVALID_WINFD;
+
+	sysHandle = usbdk_helper.GetRedirectorSystemHandle(priv->redirector_handle);
+
+	wfd = usbi_create_fd(sysHandle, IS_XFERIN(transfer) ? RW_READ : RW_WRITE, NULL, NULL);
+	// Always use the handle returned from usbi_create_fd (wfd.handle)
+	if (wfd.fd < 0) {
+		free(transfer_priv->IsochronousPacketsArray);
+		free(transfer_priv->IsochronousResultsArray);
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	if (IS_XFERIN(transfer))
+		transferRes = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+	else
+		transferRes = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, wfd.overlapped);
+
+	switch (transferRes) {
+	case TransferSuccess:
+		wfd.overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		usbi_err(ctx, "ReadPipe/WritePipe failed: %s", windows_error_str(0));
+		usbi_free_fd(&wfd);
+		free(transfer_priv->IsochronousPacketsArray);
+		free(transfer_priv->IsochronousResultsArray);
+		return LIBUSB_ERROR_IO;
+	}
+
+	transfer_priv->pollable_fd = wfd;
+	usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, IS_XFERIN(transfer) ? POLLIN : POLLOUT);
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+		return usbdk_do_control_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		if (IS_XFEROUT(transfer) && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET))
+			return LIBUSB_ERROR_NOT_SUPPORTED; //TODO: Check whether we can support this in UsbDk
+		else
+			return usbdk_do_bulk_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		return usbdk_do_iso_transfer(itransfer);
+	default:
+		usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+}
+
+static int usbdk_abort_transfers(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev);
+	struct usbdk_device_priv *priv = _usbdk_device_priv(transfer->dev_handle->dev);
+
+	if (!usbdk_helper.AbortPipe(priv->redirector_handle, transfer->endpoint)) {
+		usbi_err(ctx, "AbortPipe failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_cancel_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+		// Control transfers cancelled by IoCancelXXX() API
+		// No special treatment needed
+		return LIBUSB_SUCCESS;
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		return usbdk_abort_transfers(itransfer);
+	default:
+		usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
+		return LIBUSB_ERROR_INVALID_PARAM;
+	}
+}
+
+int windows_copy_transfer_data(struct usbi_transfer *itransfer, uint32_t io_size)
+{
+	itransfer->transferred += io_size;
+	return LIBUSB_TRANSFER_COMPLETED;
+}
+
+struct winfd *windows_get_fd(struct usbi_transfer *transfer)
+{
+	struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(transfer);
+	return &transfer_priv->pollable_fd;
+}
+
+static DWORD usbdk_translate_usbd_status(USBD_STATUS UsbdStatus)
+{
+	if (USBD_SUCCESS(UsbdStatus))
+		return NO_ERROR;
+
+	switch (UsbdStatus) {
+	case USBD_STATUS_STALL_PID:
+	case USBD_STATUS_ENDPOINT_HALTED:
+	case USBD_STATUS_BAD_START_FRAME:
+		return ERROR_GEN_FAILURE;
+	case USBD_STATUS_TIMEOUT:
+		return ERROR_SEM_TIMEOUT;
+	case USBD_STATUS_CANCELED:
+		return ERROR_OPERATION_ABORTED;
+	default:
+		return ERROR_FUNCTION_FAILED;
+	}
+}
+
+void windows_get_overlapped_result(struct usbi_transfer *transfer, struct winfd *pollable_fd, DWORD *io_result, DWORD *io_size)
+{
+	if (HasOverlappedIoCompletedSync(pollable_fd->overlapped) // Handle async requests that completed synchronously first
+			|| GetOverlappedResult(pollable_fd->handle, pollable_fd->overlapped, io_size, false)) { // Regular async overlapped
+		struct libusb_transfer *ltransfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer);
+		struct usbdk_transfer_priv *transfer_priv = _usbdk_transfer_priv(transfer);
+
+		if (ltransfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+			int i;
+			for (i = 0; i < transfer_priv->request.IsochronousPacketsArraySize; i++) {
+				struct libusb_iso_packet_descriptor *lib_desc = &ltransfer->iso_packet_desc[i];
+
+				switch (transfer_priv->IsochronousResultsArray[i].TransferResult) {
+				case STATUS_SUCCESS:
+				case STATUS_CANCELLED:
+				case STATUS_REQUEST_CANCELED:
+					lib_desc->status = LIBUSB_TRANSFER_COMPLETED; // == ERROR_SUCCESS
+					break;
+				default:
+					lib_desc->status = LIBUSB_TRANSFER_ERROR; // ERROR_UNKNOWN_EXCEPTION;
+					break;
+				}
+
+				lib_desc->actual_length = (unsigned int)transfer_priv->IsochronousResultsArray[i].ActualLength;
+			}
+		}
+
+		*io_size = (DWORD) transfer_priv->request.Result.GenResult.BytesTransferred;
+		*io_result = usbdk_translate_usbd_status((USBD_STATUS) transfer_priv->request.Result.GenResult.UsbdStatus);
+	}
+	else {
+		*io_result = GetLastError();
+	}
+}
+
+static int usbdk_clock_gettime(int clk_id, struct timespec *tp)
+{
+	return windows_clock_gettime(clk_id, tp);
+}
+
+const struct usbi_os_backend usbdk_backend = {
+	"Windows",
+	USBI_CAP_HAS_HID_ACCESS,
+	usbdk_init,
+	usbdk_exit,
+
+	usbdk_get_device_list,
+	NULL,
+	usbdk_open,
+	usbdk_close,
+
+	usbdk_get_device_descriptor,
+	usbdk_get_active_config_descriptor,
+	usbdk_get_config_descriptor,
+	NULL,
+
+	usbdk_get_configuration,
+	usbdk_set_configuration,
+	usbdk_claim_interface,
+	usbdk_release_interface,
+
+	usbdk_set_interface_altsetting,
+	usbdk_clear_halt,
+	usbdk_reset_device,
+
+	NULL,
+	NULL,
+
+	NULL,	// dev_mem_alloc()
+	NULL,	// dev_mem_free()
+
+	usbdk_kernel_driver_active,
+	usbdk_detach_kernel_driver,
+	usbdk_attach_kernel_driver,
+
+	usbdk_destroy_device,
+
+	usbdk_submit_transfer,
+	usbdk_cancel_transfer,
+	windows_clear_transfer_priv,
+
+	windows_handle_events,
+	NULL,
+
+	usbdk_clock_gettime,
+#if defined(USBI_TIMERFD_AVAILABLE)
+	NULL,
+#endif
+	sizeof(struct usbdk_device_priv),
+	0,
+	sizeof(struct usbdk_transfer_priv),
+};
+
+#endif /* USE_USBDK */

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_usbdk.h

@@ -0,0 +1,146 @@
+/*
+* windows UsbDk backend for libusb 1.0
+* Copyright © 2014 Red Hat, Inc.
+
+* Authors:
+* Dmitry Fleytman <dmitry@daynix.com>
+* Pavel Gurvich <pavel@daynix.com>
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#pragma once
+
+typedef struct tag_USB_DK_DEVICE_ID {
+	WCHAR DeviceID[MAX_DEVICE_ID_LEN];
+	WCHAR InstanceID[MAX_DEVICE_ID_LEN];
+} USB_DK_DEVICE_ID, *PUSB_DK_DEVICE_ID;
+
+static inline void UsbDkFillIDStruct(USB_DK_DEVICE_ID *ID, PCWCHAR DeviceID, PCWCHAR InstanceID)
+{
+	wcsncpy_s(ID->DeviceID, DeviceID, MAX_DEVICE_ID_LEN);
+	wcsncpy_s(ID->InstanceID, InstanceID, MAX_DEVICE_ID_LEN);
+}
+
+typedef struct tag_USB_DK_DEVICE_INFO {
+	USB_DK_DEVICE_ID ID;
+	ULONG64 FilterID;
+	ULONG64 Port;
+	ULONG64 Speed;
+	USB_DEVICE_DESCRIPTOR DeviceDescriptor;
+} USB_DK_DEVICE_INFO, *PUSB_DK_DEVICE_INFO;
+
+typedef struct tag_USB_DK_CONFIG_DESCRIPTOR_REQUEST {
+	USB_DK_DEVICE_ID ID;
+	ULONG64 Index;
+} USB_DK_CONFIG_DESCRIPTOR_REQUEST, *PUSB_DK_CONFIG_DESCRIPTOR_REQUEST;
+
+typedef struct tag_USB_DK_ISO_TRANSFER_RESULT {
+	ULONG64 ActualLength;
+	ULONG64 TransferResult;
+} USB_DK_ISO_TRANSFER_RESULT, *PUSB_DK_ISO_TRANSFER_RESULT;
+
+typedef struct tag_USB_DK_GEN_TRANSFER_RESULT {
+	ULONG64 BytesTransferred;
+	ULONG64 UsbdStatus; // USBD_STATUS code
+} USB_DK_GEN_TRANSFER_RESULT, *PUSB_DK_GEN_TRANSFER_RESULT;
+
+typedef struct tag_USB_DK_TRANSFER_RESULT {
+	USB_DK_GEN_TRANSFER_RESULT GenResult;
+	PVOID64 IsochronousResultsArray; // array of USB_DK_ISO_TRANSFER_RESULT
+} USB_DK_TRANSFER_RESULT, *PUSB_DK_TRANSFER_RESULT;
+
+typedef struct tag_USB_DK_TRANSFER_REQUEST {
+	ULONG64 EndpointAddress;
+	PVOID64 Buffer;
+	ULONG64 BufferLength;
+	ULONG64 TransferType;
+	ULONG64 IsochronousPacketsArraySize;
+	PVOID64 IsochronousPacketsArray;
+
+	USB_DK_TRANSFER_RESULT Result;
+} USB_DK_TRANSFER_REQUEST, *PUSB_DK_TRANSFER_REQUEST;
+
+typedef enum {
+	TransferFailure = 0,
+	TransferSuccess,
+	TransferSuccessAsync
+} TransferResult;
+
+typedef enum {
+	NoSpeed = 0,
+	LowSpeed,
+	FullSpeed,
+	HighSpeed,
+	SuperSpeed
+} USB_DK_DEVICE_SPEED;
+
+typedef enum {
+	ControlTransferType,
+	BulkTransferType,
+	IntertuptTransferType,
+	IsochronousTransferType
+} USB_DK_TRANSFER_TYPE;
+
+typedef BOOL (__cdecl *USBDK_GET_DEVICES_LIST)(
+	PUSB_DK_DEVICE_INFO *DeviceInfo,
+	PULONG DeviceNumber
+);
+typedef void (__cdecl *USBDK_RELEASE_DEVICES_LIST)(
+	PUSB_DK_DEVICE_INFO DeviceInfo
+);
+typedef HANDLE (__cdecl *USBDK_START_REDIRECT)(
+	PUSB_DK_DEVICE_ID DeviceId
+);
+typedef BOOL (__cdecl *USBDK_STOP_REDIRECT)(
+	HANDLE DeviceHandle
+);
+typedef BOOL (__cdecl *USBDK_GET_CONFIGURATION_DESCRIPTOR)(
+	PUSB_DK_CONFIG_DESCRIPTOR_REQUEST Request,
+	PUSB_CONFIGURATION_DESCRIPTOR *Descriptor,
+	PULONG Length
+);
+typedef void (__cdecl *USBDK_RELEASE_CONFIGURATION_DESCRIPTOR)(
+	PUSB_CONFIGURATION_DESCRIPTOR Descriptor
+);
+typedef TransferResult (__cdecl *USBDK_WRITE_PIPE)(
+	HANDLE DeviceHandle,
+	PUSB_DK_TRANSFER_REQUEST Request,
+	LPOVERLAPPED lpOverlapped
+);
+typedef TransferResult (__cdecl *USBDK_READ_PIPE)(
+	HANDLE DeviceHandle,
+	PUSB_DK_TRANSFER_REQUEST Request,
+	LPOVERLAPPED lpOverlapped
+);
+typedef BOOL (__cdecl *USBDK_ABORT_PIPE)(
+	HANDLE DeviceHandle,
+	ULONG64 PipeAddress
+);
+typedef BOOL (__cdecl *USBDK_RESET_PIPE)(
+	HANDLE DeviceHandle,
+	ULONG64 PipeAddress
+);
+typedef BOOL (__cdecl *USBDK_SET_ALTSETTING)(
+	HANDLE DeviceHandle,
+	ULONG64 InterfaceIdx,
+	ULONG64 AltSettingIdx
+);
+typedef BOOL (__cdecl *USBDK_RESET_DEVICE)(
+	HANDLE DeviceHandle
+);
+typedef HANDLE (__cdecl *USBDK_GET_REDIRECTOR_SYSTEM_HANDLE)(
+	HANDLE DeviceHandle
+);

vendor/github.com/karalabe/gousb/internal/libusb/libusb/os/windows_winusb.h

@@ -0,0 +1,937 @@
+/*
+ * Windows backend for libusb 1.0
+ * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
+ * With contributions from Michael Plante, Orin Eman et al.
+ * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
+ * Major code testing contribution by Xiaofan Chen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+#include "windows_common.h"
+#include "windows_nt_common.h"
+
+#if defined(_MSC_VER)
+// disable /W4 MSVC warnings that are benign
+#pragma warning(disable:4100)  // unreferenced formal parameter
+#pragma warning(disable:4127)  // conditional expression is constant
+#pragma warning(disable:4201)  // nameless struct/union
+#pragma warning(disable:4214)  // bit field types other than int
+#pragma warning(disable:4996)  // deprecated API calls
+#pragma warning(disable:28159) // more deprecated API calls
+#endif
+
+// Missing from MSVC6 setupapi.h
+#if !defined(SPDRP_ADDRESS)
+#define SPDRP_ADDRESS		28
+#endif
+#if !defined(SPDRP_INSTALL_STATE)
+#define SPDRP_INSTALL_STATE	34
+#endif
+
+#define MAX_CTRL_BUFFER_LENGTH	4096
+#define MAX_USB_DEVICES		256
+#define MAX_USB_STRING_LENGTH	128
+#define MAX_HID_REPORT_SIZE	1024
+#define MAX_HID_DESCRIPTOR_SIZE	256
+#define MAX_GUID_STRING_LENGTH	40
+#define MAX_PATH_LENGTH		128
+#define MAX_KEY_LENGTH		256
+#define LIST_SEPARATOR		';'
+
+// Handle code for HID interface that have been claimed ("dibs")
+#define INTERFACE_CLAIMED	((HANDLE)(intptr_t)0xD1B5)
+// Additional return code for HID operations that completed synchronously
+#define LIBUSB_COMPLETED	(LIBUSB_SUCCESS + 1)
+
+// http://msdn.microsoft.com/en-us/library/ff545978.aspx
+// http://msdn.microsoft.com/en-us/library/ff545972.aspx
+// http://msdn.microsoft.com/en-us/library/ff545982.aspx
+#if !defined(GUID_DEVINTERFACE_USB_HOST_CONTROLLER)
+const GUID GUID_DEVINTERFACE_USB_HOST_CONTROLLER = { 0x3ABF6F2D, 0x71C4, 0x462A, {0x8A, 0x92, 0x1E, 0x68, 0x61, 0xE6, 0xAF, 0x27} };
+#endif
+#if !defined(GUID_DEVINTERFACE_USB_DEVICE)
+const GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10, 0x6530, 0x11D2, {0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED} };
+#endif
+#if !defined(GUID_DEVINTERFACE_USB_HUB)
+const GUID GUID_DEVINTERFACE_USB_HUB = { 0xF18A0E88, 0xC30C, 0x11D0, {0x88, 0x15, 0x00, 0xA0, 0xC9, 0x06, 0xBE, 0xD8} };
+#endif
+#if !defined(GUID_DEVINTERFACE_LIBUSB0_FILTER)
+const GUID GUID_DEVINTERFACE_LIBUSB0_FILTER = { 0xF9F3FF14, 0xAE21, 0x48A0, {0x8A, 0x25, 0x80, 0x11, 0xA7, 0xA9, 0x31, 0xD9} };
+#endif
+
+
+/*
+ * Multiple USB API backend support
+ */
+#define USB_API_UNSUPPORTED	0
+#define USB_API_HUB		1
+#define USB_API_COMPOSITE	2
+#define USB_API_WINUSBX		3
+#define USB_API_HID		4
+#define USB_API_MAX		5
+// The following is used to indicate if the HID or composite extra props have already been set.
+#define USB_API_SET		(1 << USB_API_MAX)
+
+// Sub-APIs for WinUSB-like driver APIs (WinUSB, libusbK, libusb-win32 through the libusbK DLL)
+// Must have the same values as the KUSB_DRVID enum from libusbk.h
+#define SUB_API_NOTSET		-1
+#define SUB_API_LIBUSBK		0
+#define SUB_API_LIBUSB0		1
+#define SUB_API_WINUSB		2
+#define SUB_API_MAX		3
+
+#define WINUSBX_DRV_NAMES	{"libusbK", "libusb0", "WinUSB"}
+
+struct windows_usb_api_backend {
+	const uint8_t id;
+	const char *designation;
+	const char **driver_name_list; // Driver name, without .sys, e.g. "usbccgp"
+	const uint8_t nb_driver_names;
+	int (*init)(int sub_api, struct libusb_context *ctx);
+	int (*exit)(int sub_api);
+	int (*open)(int sub_api, struct libusb_device_handle *dev_handle);
+	void (*close)(int sub_api, struct libusb_device_handle *dev_handle);
+	int (*configure_endpoints)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
+	int (*claim_interface)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
+	int (*set_interface_altsetting)(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting);
+	int (*release_interface)(int sub_api, struct libusb_device_handle *dev_handle, int iface);
+	int (*clear_halt)(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
+	int (*reset_device)(int sub_api, struct libusb_device_handle *dev_handle);
+	int (*submit_bulk_transfer)(int sub_api, struct usbi_transfer *itransfer);
+	int (*submit_iso_transfer)(int sub_api, struct usbi_transfer *itransfer);
+	int (*submit_control_transfer)(int sub_api, struct usbi_transfer *itransfer);
+	int (*abort_control)(int sub_api, struct usbi_transfer *itransfer);
+	int (*abort_transfers)(int sub_api, struct usbi_transfer *itransfer);
+	int (*copy_transfer_data)(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size);
+};
+
+extern const struct windows_usb_api_backend usb_api_backend[USB_API_MAX];
+
+#define PRINT_UNSUPPORTED_API(fname)				\
+	usbi_dbg("unsupported API call for '"			\
+		#fname "' (unrecognized device driver)");	\
+	return LIBUSB_ERROR_NOT_SUPPORTED;
+
+/*
+ * private structures definition
+ * with inline pseudo constructors/destructors
+ */
+
+// TODO (v2+): move hid desc to libusb.h?
+struct libusb_hid_descriptor {
+	uint8_t bLength;
+	uint8_t bDescriptorType;
+	uint16_t bcdHID;
+	uint8_t bCountryCode;
+	uint8_t bNumDescriptors;
+	uint8_t bClassDescriptorType;
+	uint16_t wClassDescriptorLength;
+};
+
+#define LIBUSB_DT_HID_SIZE		9
+#define HID_MAX_CONFIG_DESC_SIZE (LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE \
+	+ LIBUSB_DT_HID_SIZE + 2 * LIBUSB_DT_ENDPOINT_SIZE)
+#define HID_MAX_REPORT_SIZE		1024
+#define HID_IN_EP			0x81
+#define HID_OUT_EP			0x02
+#define LIBUSB_REQ_RECIPIENT(request_type)	((request_type) & 0x1F)
+#define LIBUSB_REQ_TYPE(request_type)		((request_type) & (0x03 << 5))
+#define LIBUSB_REQ_IN(request_type)		((request_type) & LIBUSB_ENDPOINT_IN)
+#define LIBUSB_REQ_OUT(request_type)		(!LIBUSB_REQ_IN(request_type))
+
+// The following are used for HID reports IOCTLs
+#define HID_CTL_CODE(id) \
+	CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_NEITHER, FILE_ANY_ACCESS)
+#define HID_BUFFER_CTL_CODE(id) \
+	CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_BUFFERED, FILE_ANY_ACCESS)
+#define HID_IN_CTL_CODE(id) \
+	CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_IN_DIRECT, FILE_ANY_ACCESS)
+#define HID_OUT_CTL_CODE(id) \
+	CTL_CODE (FILE_DEVICE_KEYBOARD, (id), METHOD_OUT_DIRECT, FILE_ANY_ACCESS)
+
+#define IOCTL_HID_GET_FEATURE		HID_OUT_CTL_CODE(100)
+#define IOCTL_HID_GET_INPUT_REPORT	HID_OUT_CTL_CODE(104)
+#define IOCTL_HID_SET_FEATURE		HID_IN_CTL_CODE(100)
+#define IOCTL_HID_SET_OUTPUT_REPORT	HID_IN_CTL_CODE(101)
+
+enum libusb_hid_request_type {
+	HID_REQ_GET_REPORT = 0x01,
+	HID_REQ_GET_IDLE = 0x02,
+	HID_REQ_GET_PROTOCOL = 0x03,
+	HID_REQ_SET_REPORT = 0x09,
+	HID_REQ_SET_IDLE = 0x0A,
+	HID_REQ_SET_PROTOCOL = 0x0B
+};
+
+enum libusb_hid_report_type {
+	HID_REPORT_TYPE_INPUT = 0x01,
+	HID_REPORT_TYPE_OUTPUT = 0x02,
+	HID_REPORT_TYPE_FEATURE = 0x03
+};
+
+struct hid_device_priv {
+	uint16_t vid;
+	uint16_t pid;
+	uint8_t config;
+	uint8_t nb_interfaces;
+	bool uses_report_ids[3]; // input, ouptput, feature
+	uint16_t input_report_size;
+	uint16_t output_report_size;
+	uint16_t feature_report_size;
+	WCHAR string[3][MAX_USB_STRING_LENGTH];
+	uint8_t string_index[3]; // man, prod, ser
+};
+
+struct windows_device_priv {
+	uint8_t depth; // distance to HCD
+	uint8_t port;  // port number on the hub
+	uint8_t active_config;
+	struct windows_usb_api_backend const *apib;
+	char *path;  // device interface path
+	int sub_api; // for WinUSB-like APIs
+	struct {
+		char *path; // each interface needs a device interface path,
+		struct windows_usb_api_backend const *apib; // an API backend (multiple drivers support),
+		int sub_api;
+		int8_t nb_endpoints; // and a set of endpoint addresses (USB_MAXENDPOINTS)
+		uint8_t *endpoint;
+		bool restricted_functionality;  // indicates if the interface functionality is restricted
+                                                // by Windows (eg. HID keyboards or mice cannot do R/W)
+	} usb_interface[USB_MAXINTERFACES];
+	struct hid_device_priv *hid;
+	USB_DEVICE_DESCRIPTOR dev_descriptor;
+	unsigned char **config_descriptor; // list of pointers to the cached config descriptors
+};
+
+static inline struct windows_device_priv *_device_priv(struct libusb_device *dev)
+{
+	return (struct windows_device_priv *)dev->os_priv;
+}
+
+static inline struct windows_device_priv *windows_device_priv_init(struct libusb_device *dev)
+{
+	struct windows_device_priv *p = _device_priv(dev);
+	int i;
+
+	p->apib = &usb_api_backend[USB_API_UNSUPPORTED];
+	p->sub_api = SUB_API_NOTSET;
+	for (i = 0; i < USB_MAXINTERFACES; i++) {
+		p->usb_interface[i].apib = &usb_api_backend[USB_API_UNSUPPORTED];
+		p->usb_interface[i].sub_api = SUB_API_NOTSET;
+	}
+
+	return p;
+}
+
+static inline void windows_device_priv_release(struct libusb_device *dev)
+{
+	struct windows_device_priv *p = _device_priv(dev);
+	int i;
+
+	free(p->path);
+	if ((dev->num_configurations > 0) && (p->config_descriptor != NULL)) {
+		for (i = 0; i < dev->num_configurations; i++)
+			free(p->config_descriptor[i]);
+	}
+	free(p->config_descriptor);
+	free(p->hid);
+	for (i = 0; i < USB_MAXINTERFACES; i++) {
+		free(p->usb_interface[i].path);
+		free(p->usb_interface[i].endpoint);
+	}
+}
+
+struct interface_handle_t {
+	HANDLE dev_handle; // WinUSB needs an extra handle for the file
+	HANDLE api_handle; // used by the API to communicate with the device
+};
+
+struct windows_device_handle_priv {
+	int active_interface;
+	struct interface_handle_t interface_handle[USB_MAXINTERFACES];
+	int autoclaim_count[USB_MAXINTERFACES]; // For auto-release
+};
+
+static inline struct windows_device_handle_priv *_device_handle_priv(
+	struct libusb_device_handle *handle)
+{
+	return (struct windows_device_handle_priv *)handle->os_priv;
+}
+
+// used for async polling functions
+struct windows_transfer_priv {
+	struct winfd pollable_fd;
+	uint8_t interface_number;
+	uint8_t *hid_buffer; // 1 byte extended data buffer, required for HID
+	uint8_t *hid_dest;   // transfer buffer destination, required for HID
+	size_t hid_expected_size;
+};
+
+// used to match a device driver (including filter drivers) against a supported API
+struct driver_lookup {
+	char list[MAX_KEY_LENGTH + 1]; // REG_MULTI_SZ list of services (driver) names
+	const DWORD reg_prop;          // SPDRP registry key to use to retrieve list
+	const char* designation;       // internal designation (for debug output)
+};
+
+/* OLE32 dependency */
+DLL_DECLARE_HANDLE(OLE32);
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, HRESULT, p, CLSIDFromString, (LPCOLESTR, LPCLSID));
+
+/* Kernel32 dependencies */
+DLL_DECLARE_HANDLE(Kernel32);
+/* This call is only available from XP SP2 */
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, IsWow64Process, (HANDLE, PBOOL));
+
+/* SetupAPI dependencies */
+DLL_DECLARE_HANDLE(SetupAPI);
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, HDEVINFO, p, SetupDiGetClassDevsA, (const GUID*, PCSTR, HWND, DWORD));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, SetupDiEnumDeviceInfo, (HDEVINFO, DWORD, PSP_DEVINFO_DATA));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, SetupDiEnumDeviceInterfaces, (HDEVINFO, PSP_DEVINFO_DATA,
+			const GUID*, DWORD, PSP_DEVICE_INTERFACE_DATA));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, SetupDiGetDeviceInterfaceDetailA, (HDEVINFO, PSP_DEVICE_INTERFACE_DATA,
+			PSP_DEVICE_INTERFACE_DETAIL_DATA_A, DWORD, PDWORD, PSP_DEVINFO_DATA));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, SetupDiDestroyDeviceInfoList, (HDEVINFO));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, HKEY, p, SetupDiOpenDevRegKey, (HDEVINFO, PSP_DEVINFO_DATA, DWORD, DWORD, DWORD, REGSAM));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, SetupDiGetDeviceRegistryPropertyA, (HDEVINFO,
+			PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, HKEY, p, SetupDiOpenDeviceInterfaceRegKey, (HDEVINFO, PSP_DEVICE_INTERFACE_DATA, DWORD, DWORD));
+
+/* AdvAPI32 dependencies */
+DLL_DECLARE_HANDLE(AdvAPI32);
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, LONG, p, RegQueryValueExW, (HKEY, LPCWSTR, LPDWORD, LPDWORD, LPBYTE, LPDWORD));
+DLL_DECLARE_FUNC_PREFIXED(WINAPI, LONG, p, RegCloseKey, (HKEY));
+
+/*
+ * Windows DDK API definitions. Most of it copied from MinGW's includes
+ */
+typedef DWORD DEVNODE, DEVINST;
+typedef DEVNODE *PDEVNODE, *PDEVINST;
+typedef DWORD RETURN_TYPE;
+typedef RETURN_TYPE CONFIGRET;
+
+#define CR_SUCCESS				0x00000000
+#define CR_NO_SUCH_DEVNODE			0x0000000D
+
+#define USB_DEVICE_DESCRIPTOR_TYPE		LIBUSB_DT_DEVICE
+#define USB_CONFIGURATION_DESCRIPTOR_TYPE	LIBUSB_DT_CONFIG
+#define USB_STRING_DESCRIPTOR_TYPE		LIBUSB_DT_STRING
+#define USB_INTERFACE_DESCRIPTOR_TYPE		LIBUSB_DT_INTERFACE
+#define USB_ENDPOINT_DESCRIPTOR_TYPE		LIBUSB_DT_ENDPOINT
+
+#define USB_REQUEST_GET_STATUS			LIBUSB_REQUEST_GET_STATUS
+#define USB_REQUEST_CLEAR_FEATURE		LIBUSB_REQUEST_CLEAR_FEATURE
+#define USB_REQUEST_SET_FEATURE			LIBUSB_REQUEST_SET_FEATURE
+#define USB_REQUEST_SET_ADDRESS			LIBUSB_REQUEST_SET_ADDRESS
+#define USB_REQUEST_GET_DESCRIPTOR		LIBUSB_REQUEST_GET_DESCRIPTOR
+#define USB_REQUEST_SET_DESCRIPTOR		LIBUSB_REQUEST_SET_DESCRIPTOR
+#define USB_REQUEST_GET_CONFIGURATION		LIBUSB_REQUEST_GET_CONFIGURATION
+#define USB_REQUEST_SET_CONFIGURATION		LIBUSB_REQUEST_SET_CONFIGURATION
+#define USB_REQUEST_GET_INTERFACE		LIBUSB_REQUEST_GET_INTERFACE
+#define USB_REQUEST_SET_INTERFACE		LIBUSB_REQUEST_SET_INTERFACE
+#define USB_REQUEST_SYNC_FRAME			LIBUSB_REQUEST_SYNCH_FRAME
+
+#define USB_GET_NODE_INFORMATION		258
+#define USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION	260
+#define USB_GET_NODE_CONNECTION_NAME		261
+#define USB_GET_HUB_CAPABILITIES		271
+#if !defined(USB_GET_NODE_CONNECTION_INFORMATION_EX)
+#define USB_GET_NODE_CONNECTION_INFORMATION_EX	274
+#endif
+#if !defined(USB_GET_HUB_CAPABILITIES_EX)
+#define USB_GET_HUB_CAPABILITIES_EX		276
+#endif
+#if !defined(USB_GET_NODE_CONNECTION_INFORMATION_EX_V2)
+#define USB_GET_NODE_CONNECTION_INFORMATION_EX_V2	279
+#endif
+
+#ifndef METHOD_BUFFERED
+#define METHOD_BUFFERED				0
+#endif
+#ifndef FILE_ANY_ACCESS
+#define FILE_ANY_ACCESS				0x00000000
+#endif
+#ifndef FILE_DEVICE_UNKNOWN
+#define FILE_DEVICE_UNKNOWN			0x00000022
+#endif
+#ifndef FILE_DEVICE_USB
+#define FILE_DEVICE_USB				FILE_DEVICE_UNKNOWN
+#endif
+
+#ifndef CTL_CODE
+#define CTL_CODE(DeviceType, Function, Method, Access) \
+	(((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method))
+#endif
+
+typedef enum USB_CONNECTION_STATUS {
+	NoDeviceConnected,
+	DeviceConnected,
+	DeviceFailedEnumeration,
+	DeviceGeneralFailure,
+	DeviceCausedOvercurrent,
+	DeviceNotEnoughPower,
+	DeviceNotEnoughBandwidth,
+	DeviceHubNestedTooDeeply,
+	DeviceInLegacyHub
+} USB_CONNECTION_STATUS, *PUSB_CONNECTION_STATUS;
+
+typedef enum USB_HUB_NODE {
+	UsbHub,
+	UsbMIParent
+} USB_HUB_NODE;
+
+/* Cfgmgr32.dll interface */
+DLL_DECLARE_HANDLE(Cfgmgr32);
+DLL_DECLARE_FUNC(WINAPI, CONFIGRET, CM_Get_Parent, (PDEVINST, DEVINST, ULONG));
+DLL_DECLARE_FUNC(WINAPI, CONFIGRET, CM_Get_Child, (PDEVINST, DEVINST, ULONG));
+DLL_DECLARE_FUNC(WINAPI, CONFIGRET, CM_Get_Sibling, (PDEVINST, DEVINST, ULONG));
+DLL_DECLARE_FUNC(WINAPI, CONFIGRET, CM_Get_Device_IDA, (DEVINST, PCHAR, ULONG, ULONG));
+
+#define IOCTL_USB_GET_HUB_CAPABILITIES_EX \
+	CTL_CODE( FILE_DEVICE_USB, USB_GET_HUB_CAPABILITIES_EX, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_HUB_CAPABILITIES \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_HUB_CAPABILITIES, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_ROOT_HUB_NAME \
+	CTL_CODE(FILE_DEVICE_USB, HCD_GET_ROOT_HUB_NAME, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_NODE_INFORMATION \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_INFORMATION, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_INFORMATION_EX, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2 \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_INFORMATION_EX_V2, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_NODE_CONNECTION_ATTRIBUTES \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_ATTRIBUTES, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+#define IOCTL_USB_GET_NODE_CONNECTION_NAME \
+	CTL_CODE(FILE_DEVICE_USB, USB_GET_NODE_CONNECTION_NAME, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+// Most of the structures below need to be packed
+#pragma pack(push, 1)
+
+typedef struct USB_INTERFACE_DESCRIPTOR {
+	UCHAR bLength;
+	UCHAR bDescriptorType;
+	UCHAR bInterfaceNumber;
+	UCHAR bAlternateSetting;
+	UCHAR bNumEndpoints;
+	UCHAR bInterfaceClass;
+	UCHAR bInterfaceSubClass;
+	UCHAR bInterfaceProtocol;
+	UCHAR iInterface;
+} USB_INTERFACE_DESCRIPTOR, *PUSB_INTERFACE_DESCRIPTOR;
+
+typedef struct USB_CONFIGURATION_DESCRIPTOR_SHORT {
+	struct {
+		ULONG ConnectionIndex;
+		struct {
+			UCHAR bmRequest;
+			UCHAR bRequest;
+			USHORT wValue;
+			USHORT wIndex;
+			USHORT wLength;
+		} SetupPacket;
+	} req;
+	USB_CONFIGURATION_DESCRIPTOR data;
+} USB_CONFIGURATION_DESCRIPTOR_SHORT;
+
+typedef struct USB_ENDPOINT_DESCRIPTOR {
+	UCHAR bLength;
+	UCHAR bDescriptorType;
+	UCHAR bEndpointAddress;
+	UCHAR bmAttributes;
+	USHORT wMaxPacketSize;
+	UCHAR bInterval;
+} USB_ENDPOINT_DESCRIPTOR, *PUSB_ENDPOINT_DESCRIPTOR;
+
+typedef struct USB_DESCRIPTOR_REQUEST {
+	ULONG ConnectionIndex;
+	struct {
+		UCHAR bmRequest;
+		UCHAR bRequest;
+		USHORT wValue;
+		USHORT wIndex;
+		USHORT wLength;
+	} SetupPacket;
+//	UCHAR Data[0];
+} USB_DESCRIPTOR_REQUEST, *PUSB_DESCRIPTOR_REQUEST;
+
+typedef struct USB_HUB_DESCRIPTOR {
+	UCHAR bDescriptorLength;
+	UCHAR bDescriptorType;
+	UCHAR bNumberOfPorts;
+	USHORT wHubCharacteristics;
+	UCHAR bPowerOnToPowerGood;
+	UCHAR bHubControlCurrent;
+	UCHAR bRemoveAndPowerMask[64];
+} USB_HUB_DESCRIPTOR, *PUSB_HUB_DESCRIPTOR;
+
+typedef struct USB_ROOT_HUB_NAME {
+	ULONG ActualLength;
+	WCHAR RootHubName[1];
+} USB_ROOT_HUB_NAME, *PUSB_ROOT_HUB_NAME;
+
+typedef struct USB_ROOT_HUB_NAME_FIXED {
+	ULONG ActualLength;
+	WCHAR RootHubName[MAX_PATH_LENGTH];
+} USB_ROOT_HUB_NAME_FIXED;
+
+typedef struct USB_NODE_CONNECTION_NAME {
+	ULONG ConnectionIndex;
+	ULONG ActualLength;
+	WCHAR NodeName[1];
+} USB_NODE_CONNECTION_NAME, *PUSB_NODE_CONNECTION_NAME;
+
+typedef struct USB_NODE_CONNECTION_NAME_FIXED {
+	ULONG ConnectionIndex;
+	ULONG ActualLength;
+	WCHAR NodeName[MAX_PATH_LENGTH];
+} USB_NODE_CONNECTION_NAME_FIXED;
+
+typedef struct USB_HUB_NAME_FIXED {
+	union {
+		USB_ROOT_HUB_NAME_FIXED root;
+		USB_NODE_CONNECTION_NAME_FIXED node;
+	} u;
+} USB_HUB_NAME_FIXED;
+
+typedef struct USB_HUB_INFORMATION {
+	USB_HUB_DESCRIPTOR HubDescriptor;
+	BOOLEAN HubIsBusPowered;
+} USB_HUB_INFORMATION, *PUSB_HUB_INFORMATION;
+
+typedef struct USB_MI_PARENT_INFORMATION {
+	ULONG NumberOfInterfaces;
+} USB_MI_PARENT_INFORMATION, *PUSB_MI_PARENT_INFORMATION;
+
+typedef struct USB_NODE_INFORMATION {
+	USB_HUB_NODE NodeType;
+	union {
+		USB_HUB_INFORMATION HubInformation;
+		USB_MI_PARENT_INFORMATION MiParentInformation;
+	} u;
+} USB_NODE_INFORMATION, *PUSB_NODE_INFORMATION;
+
+typedef struct USB_PIPE_INFO {
+	USB_ENDPOINT_DESCRIPTOR EndpointDescriptor;
+	ULONG ScheduleOffset;
+} USB_PIPE_INFO, *PUSB_PIPE_INFO;
+
+typedef struct USB_NODE_CONNECTION_INFORMATION_EX {
+	ULONG ConnectionIndex;
+	USB_DEVICE_DESCRIPTOR DeviceDescriptor;
+	UCHAR CurrentConfigurationValue;
+	UCHAR Speed;
+	BOOLEAN DeviceIsHub;
+	USHORT DeviceAddress;
+	ULONG NumberOfOpenPipes;
+	USB_CONNECTION_STATUS ConnectionStatus;
+//	USB_PIPE_INFO PipeList[0];
+} USB_NODE_CONNECTION_INFORMATION_EX, *PUSB_NODE_CONNECTION_INFORMATION_EX;
+
+typedef union _USB_PROTOCOLS {
+	ULONG ul;
+	struct {
+		ULONG Usb110:1;
+		ULONG Usb200:1;
+		ULONG Usb300:1;
+		ULONG ReservedMBZ:29;
+	};
+} USB_PROTOCOLS, *PUSB_PROTOCOLS;
+
+typedef union _USB_NODE_CONNECTION_INFORMATION_EX_V2_FLAGS {
+	ULONG ul;
+	struct {
+		ULONG DeviceIsOperatingAtSuperSpeedOrHigher:1;
+		ULONG DeviceIsSuperSpeedCapableOrHigher:1;
+		ULONG ReservedMBZ:30;
+	};
+} USB_NODE_CONNECTION_INFORMATION_EX_V2_FLAGS, *PUSB_NODE_CONNECTION_INFORMATION_EX_V2_FLAGS;
+
+typedef struct _USB_NODE_CONNECTION_INFORMATION_EX_V2 {
+	ULONG ConnectionIndex;
+	ULONG Length;
+	USB_PROTOCOLS SupportedUsbProtocols;
+	USB_NODE_CONNECTION_INFORMATION_EX_V2_FLAGS Flags;
+} USB_NODE_CONNECTION_INFORMATION_EX_V2, *PUSB_NODE_CONNECTION_INFORMATION_EX_V2;
+
+typedef struct USB_HUB_CAP_FLAGS {
+	ULONG HubIsHighSpeedCapable:1;
+	ULONG HubIsHighSpeed:1;
+	ULONG HubIsMultiTtCapable:1;
+	ULONG HubIsMultiTt:1;
+	ULONG HubIsRoot:1;
+	ULONG HubIsArmedWakeOnConnect:1;
+	ULONG ReservedMBZ:26;
+} USB_HUB_CAP_FLAGS, *PUSB_HUB_CAP_FLAGS;
+
+typedef struct USB_HUB_CAPABILITIES {
+	ULONG HubIs2xCapable:1;
+} USB_HUB_CAPABILITIES, *PUSB_HUB_CAPABILITIES;
+
+typedef struct USB_HUB_CAPABILITIES_EX {
+	USB_HUB_CAP_FLAGS CapabilityFlags;
+} USB_HUB_CAPABILITIES_EX, *PUSB_HUB_CAPABILITIES_EX;
+
+#pragma pack(pop)
+
+/* winusb.dll interface */
+
+#define SHORT_PACKET_TERMINATE	0x01
+#define AUTO_CLEAR_STALL	0x02
+#define PIPE_TRANSFER_TIMEOUT	0x03
+#define IGNORE_SHORT_PACKETS	0x04
+#define ALLOW_PARTIAL_READS	0x05
+#define AUTO_FLUSH		0x06
+#define RAW_IO			0x07
+#define MAXIMUM_TRANSFER_SIZE	0x08
+#define AUTO_SUSPEND		0x81
+#define SUSPEND_DELAY		0x83
+#define DEVICE_SPEED		0x01
+#define LowSpeed		0x01
+#define FullSpeed		0x02
+#define HighSpeed		0x03
+
+typedef enum USBD_PIPE_TYPE {
+	UsbdPipeTypeControl,
+	UsbdPipeTypeIsochronous,
+	UsbdPipeTypeBulk,
+	UsbdPipeTypeInterrupt
+} USBD_PIPE_TYPE;
+
+typedef struct {
+	USBD_PIPE_TYPE PipeType;
+	UCHAR PipeId;
+	USHORT MaximumPacketSize;
+	UCHAR Interval;
+} WINUSB_PIPE_INFORMATION, *PWINUSB_PIPE_INFORMATION;
+
+#pragma pack(1)
+typedef struct {
+	UCHAR request_type;
+	UCHAR request;
+	USHORT value;
+	USHORT index;
+	USHORT length;
+} WINUSB_SETUP_PACKET, *PWINUSB_SETUP_PACKET;
+#pragma pack()
+
+typedef void *WINUSB_INTERFACE_HANDLE, *PWINUSB_INTERFACE_HANDLE;
+
+typedef BOOL (WINAPI *WinUsb_AbortPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID
+);
+typedef BOOL (WINAPI *WinUsb_ControlTransfer_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	WINUSB_SETUP_PACKET SetupPacket,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	PULONG LengthTransferred,
+	LPOVERLAPPED Overlapped
+);
+typedef BOOL (WINAPI *WinUsb_FlushPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID
+);
+typedef BOOL (WINAPI *WinUsb_Free_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle
+);
+typedef BOOL (WINAPI *WinUsb_GetAssociatedInterface_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR AssociatedInterfaceIndex,
+	PWINUSB_INTERFACE_HANDLE AssociatedInterfaceHandle
+);
+typedef BOOL (WINAPI *WinUsb_GetCurrentAlternateSetting_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	PUCHAR AlternateSetting
+);
+typedef BOOL (WINAPI *WinUsb_GetDescriptor_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR DescriptorType,
+	UCHAR Index,
+	USHORT LanguageID,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	PULONG LengthTransferred
+);
+typedef BOOL (WINAPI *WinUsb_GetOverlappedResult_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	LPOVERLAPPED lpOverlapped,
+	LPDWORD lpNumberOfBytesTransferred,
+	BOOL bWait
+);
+typedef BOOL (WINAPI *WinUsb_GetPipePolicy_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	ULONG PolicyType,
+	PULONG ValueLength,
+	PVOID Value
+);
+typedef BOOL (WINAPI *WinUsb_GetPowerPolicy_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	ULONG PolicyType,
+	PULONG ValueLength,
+	PVOID Value
+);
+typedef BOOL (WINAPI *WinUsb_Initialize_t)(
+	HANDLE DeviceHandle,
+	PWINUSB_INTERFACE_HANDLE InterfaceHandle
+);
+typedef BOOL (WINAPI *WinUsb_QueryDeviceInformation_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	ULONG InformationType,
+	PULONG BufferLength,
+	PVOID Buffer
+);
+typedef BOOL (WINAPI *WinUsb_QueryInterfaceSettings_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR AlternateSettingNumber,
+	PUSB_INTERFACE_DESCRIPTOR UsbAltInterfaceDescriptor
+);
+typedef BOOL (WINAPI *WinUsb_QueryPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR AlternateInterfaceNumber,
+	UCHAR PipeIndex,
+	PWINUSB_PIPE_INFORMATION PipeInformation
+);
+typedef BOOL (WINAPI *WinUsb_ReadPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	PULONG LengthTransferred,
+	LPOVERLAPPED Overlapped
+);
+typedef BOOL (WINAPI *WinUsb_ResetPipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID
+);
+typedef BOOL (WINAPI *WinUsb_SetCurrentAlternateSetting_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR AlternateSetting
+);
+typedef BOOL (WINAPI *WinUsb_SetPipePolicy_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	ULONG PolicyType,
+	ULONG ValueLength,
+	PVOID Value
+);
+typedef BOOL (WINAPI *WinUsb_SetPowerPolicy_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	ULONG PolicyType,
+	ULONG ValueLength,
+	PVOID Value
+);
+typedef BOOL (WINAPI *WinUsb_WritePipe_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle,
+	UCHAR PipeID,
+	PUCHAR Buffer,
+	ULONG BufferLength,
+	PULONG LengthTransferred,
+	LPOVERLAPPED Overlapped
+);
+typedef BOOL (WINAPI *WinUsb_ResetDevice_t)(
+	WINUSB_INTERFACE_HANDLE InterfaceHandle
+);
+
+/* /!\ These must match the ones from the official libusbk.h */
+typedef enum _KUSB_FNID {
+	KUSB_FNID_Init,
+	KUSB_FNID_Free,
+	KUSB_FNID_ClaimInterface,
+	KUSB_FNID_ReleaseInterface,
+	KUSB_FNID_SetAltInterface,
+	KUSB_FNID_GetAltInterface,
+	KUSB_FNID_GetDescriptor,
+	KUSB_FNID_ControlTransfer,
+	KUSB_FNID_SetPowerPolicy,
+	KUSB_FNID_GetPowerPolicy,
+	KUSB_FNID_SetConfiguration,
+	KUSB_FNID_GetConfiguration,
+	KUSB_FNID_ResetDevice,
+	KUSB_FNID_Initialize,
+	KUSB_FNID_SelectInterface,
+	KUSB_FNID_GetAssociatedInterface,
+	KUSB_FNID_Clone,
+	KUSB_FNID_QueryInterfaceSettings,
+	KUSB_FNID_QueryDeviceInformation,
+	KUSB_FNID_SetCurrentAlternateSetting,
+	KUSB_FNID_GetCurrentAlternateSetting,
+	KUSB_FNID_QueryPipe,
+	KUSB_FNID_SetPipePolicy,
+	KUSB_FNID_GetPipePolicy,
+	KUSB_FNID_ReadPipe,
+	KUSB_FNID_WritePipe,
+	KUSB_FNID_ResetPipe,
+	KUSB_FNID_AbortPipe,
+	KUSB_FNID_FlushPipe,
+	KUSB_FNID_IsoReadPipe,
+	KUSB_FNID_IsoWritePipe,
+	KUSB_FNID_GetCurrentFrameNumber,
+	KUSB_FNID_GetOverlappedResult,
+	KUSB_FNID_GetProperty,
+	KUSB_FNID_COUNT,
+} KUSB_FNID;
+
+typedef struct _KLIB_VERSION {
+	INT Major;
+	INT Minor;
+	INT Micro;
+	INT Nano;
+} KLIB_VERSION;
+typedef KLIB_VERSION* PKLIB_VERSION;
+
+typedef BOOL (WINAPI *LibK_GetProcAddress_t)(
+	PVOID *ProcAddress,
+	ULONG DriverID,
+	ULONG FunctionID
+);
+
+typedef VOID (WINAPI *LibK_GetVersion_t)(
+	PKLIB_VERSION Version
+);
+
+struct winusb_interface {
+	bool initialized;
+	WinUsb_AbortPipe_t AbortPipe;
+	WinUsb_ControlTransfer_t ControlTransfer;
+	WinUsb_FlushPipe_t FlushPipe;
+	WinUsb_Free_t Free;
+	WinUsb_GetAssociatedInterface_t GetAssociatedInterface;
+	WinUsb_GetCurrentAlternateSetting_t GetCurrentAlternateSetting;
+	WinUsb_GetDescriptor_t GetDescriptor;
+	WinUsb_GetOverlappedResult_t GetOverlappedResult;
+	WinUsb_GetPipePolicy_t GetPipePolicy;
+	WinUsb_GetPowerPolicy_t GetPowerPolicy;
+	WinUsb_Initialize_t Initialize;
+	WinUsb_QueryDeviceInformation_t QueryDeviceInformation;
+	WinUsb_QueryInterfaceSettings_t QueryInterfaceSettings;
+	WinUsb_QueryPipe_t QueryPipe;
+	WinUsb_ReadPipe_t ReadPipe;
+	WinUsb_ResetPipe_t ResetPipe;
+	WinUsb_SetCurrentAlternateSetting_t SetCurrentAlternateSetting;
+	WinUsb_SetPipePolicy_t SetPipePolicy;
+	WinUsb_SetPowerPolicy_t SetPowerPolicy;
+	WinUsb_WritePipe_t WritePipe;
+	WinUsb_ResetDevice_t ResetDevice;
+};
+
+/* hid.dll interface */
+
+#define HIDP_STATUS_SUCCESS	0x110000
+typedef void * PHIDP_PREPARSED_DATA;
+
+#pragma pack(1)
+typedef struct {
+	ULONG Size;
+	USHORT VendorID;
+	USHORT ProductID;
+	USHORT VersionNumber;
+} HIDD_ATTRIBUTES, *PHIDD_ATTRIBUTES;
+#pragma pack()
+
+typedef USHORT USAGE;
+typedef struct {
+	USAGE Usage;
+	USAGE UsagePage;
+	USHORT InputReportByteLength;
+	USHORT OutputReportByteLength;
+	USHORT FeatureReportByteLength;
+	USHORT Reserved[17];
+	USHORT NumberLinkCollectionNodes;
+	USHORT NumberInputButtonCaps;
+	USHORT NumberInputValueCaps;
+	USHORT NumberInputDataIndices;
+	USHORT NumberOutputButtonCaps;
+	USHORT NumberOutputValueCaps;
+	USHORT NumberOutputDataIndices;
+	USHORT NumberFeatureButtonCaps;
+	USHORT NumberFeatureValueCaps;
+	USHORT NumberFeatureDataIndices;
+} HIDP_CAPS, *PHIDP_CAPS;
+
+typedef enum _HIDP_REPORT_TYPE {
+	HidP_Input,
+	HidP_Output,
+	HidP_Feature
+} HIDP_REPORT_TYPE;
+
+typedef struct _HIDP_VALUE_CAPS {
+	USAGE UsagePage;
+	UCHAR ReportID;
+	BOOLEAN IsAlias;
+	USHORT BitField;
+	USHORT LinkCollection;
+	USAGE LinkUsage;
+	USAGE LinkUsagePage;
+	BOOLEAN IsRange;
+	BOOLEAN IsStringRange;
+	BOOLEAN IsDesignatorRange;
+	BOOLEAN IsAbsolute;
+	BOOLEAN HasNull;
+	UCHAR Reserved;
+	USHORT BitSize;
+	USHORT ReportCount;
+	USHORT Reserved2[5];
+	ULONG UnitsExp;
+	ULONG Units;
+	LONG LogicalMin, LogicalMax;
+	LONG PhysicalMin, PhysicalMax;
+	union {
+		struct {
+			USAGE UsageMin, UsageMax;
+			USHORT StringMin, StringMax;
+			USHORT DesignatorMin, DesignatorMax;
+			USHORT DataIndexMin, DataIndexMax;
+		} Range;
+		struct {
+			USAGE Usage, Reserved1;
+			USHORT StringIndex, Reserved2;
+			USHORT DesignatorIndex, Reserved3;
+			USHORT DataIndex, Reserved4;
+		} NotRange;
+	} u;
+} HIDP_VALUE_CAPS, *PHIDP_VALUE_CAPS;
+
+DLL_DECLARE_HANDLE(hid);
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetAttributes, (HANDLE, PHIDD_ATTRIBUTES));
+DLL_DECLARE_FUNC(WINAPI, VOID, HidD_GetHidGuid, (LPGUID));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetPreparsedData, (HANDLE, PHIDP_PREPARSED_DATA *));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_FreePreparsedData, (PHIDP_PREPARSED_DATA));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetManufacturerString, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetProductString, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetSerialNumberString, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, LONG, HidP_GetCaps, (PHIDP_PREPARSED_DATA, PHIDP_CAPS));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_SetNumInputBuffers, (HANDLE, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_SetFeature, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetFeature, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetPhysicalDescriptor, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_GetInputReport, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_SetOutputReport, (HANDLE, PVOID, ULONG));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidD_FlushQueue, (HANDLE));
+DLL_DECLARE_FUNC(WINAPI, BOOL, HidP_GetValueCaps, (HIDP_REPORT_TYPE, PHIDP_VALUE_CAPS, PULONG, PHIDP_PREPARSED_DATA));

vendor/github.com/karalabe/gousb/internal/libusb/libusb/strerror.c

@@ -0,0 +1,202 @@
+/*
+ * libusb strerror code
+ * Copyright © 2013 Hans de Goede <hdegoede@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(HAVE_STRINGS_H)
+#include <strings.h>
+#endif
+
+#include "libusbi.h"
+
+#if defined(_MSC_VER)
+#define strncasecmp _strnicmp
+#endif
+
+static size_t usbi_locale = 0;
+
+/** \ingroup libusb_misc
+ * How to add a new \ref libusb_strerror() translation:
+ * <ol>
+ * <li> Download the latest \c strerror.c from:<br>
+ *      https://raw.github.com/libusb/libusb/master/libusb/sterror.c </li>
+ * <li> Open the file in an UTF-8 capable editor </li>
+ * <li> Add the 2 letter <a href="http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes">ISO 639-1</a>
+ *      code for your locale at the end of \c usbi_locale_supported[]<br>
+ *    Eg. for Chinese, you would add "zh" so that:
+ *    \code... usbi_locale_supported[] = { "en", "nl", "fr" };\endcode
+ *    becomes:
+ *    \code... usbi_locale_supported[] = { "en", "nl", "fr", "zh" };\endcode </li>
+ * <li> Copy the <tt>{ / * English (en) * / ... }</tt> section and add it at the end of \c usbi_localized_errors<br>
+ *    Eg. for Chinese, the last section of \c usbi_localized_errors could look like:
+ *    \code
+ *     }, { / * Chinese (zh) * /
+ *         "Success",
+ *         ...
+ *         "Other error",
+ *     }
+ * };\endcode </li>
+ * <li> Translate each of the English messages from the section you copied into your language </li>
+ * <li> Save the file (in UTF-8 format) and send it to \c libusb-devel\@lists.sourceforge.net </li>
+ * </ol>
+ */
+
+static const char* usbi_locale_supported[] = { "en", "nl", "fr", "ru" };
+static const char* usbi_localized_errors[ARRAYSIZE(usbi_locale_supported)][LIBUSB_ERROR_COUNT] = {
+	{ /* English (en) */
+		"Success",
+		"Input/Output Error",
+		"Invalid parameter",
+		"Access denied (insufficient permissions)",
+		"No such device (it may have been disconnected)",
+		"Entity not found",
+		"Resource busy",
+		"Operation timed out",
+		"Overflow",
+		"Pipe error",
+		"System call interrupted (perhaps due to signal)",
+		"Insufficient memory",
+		"Operation not supported or unimplemented on this platform",
+		"Other error",
+	}, { /* Dutch (nl) */
+		"Gelukt",
+		"Invoer-/uitvoerfout",
+		"Ongeldig argument",
+		"Toegang geweigerd (onvoldoende toegangsrechten)",
+		"Apparaat bestaat niet (verbinding met apparaat verbroken?)",
+		"Niet gevonden",
+		"Apparaat of hulpbron is bezig",
+		"Bewerking verlopen",
+		"Waarde is te groot",
+		"Gebroken pijp",
+		"Onderbroken systeemaanroep",
+		"Onvoldoende geheugen beschikbaar",
+		"Bewerking wordt niet ondersteund",
+		"Andere fout",
+	}, { /* French (fr) */
+		"Succès",
+		"Erreur d'entrée/sortie",
+		"Paramètre invalide",
+		"Accès refusé (permissions insuffisantes)",
+		"Périphérique introuvable (peut-être déconnecté)",
+		"Elément introuvable",
+		"Resource déjà occupée",
+		"Operation expirée",
+		"Débordement",
+		"Erreur de pipe",
+		"Appel système abandonné (peut-être à cause d’un signal)",
+		"Mémoire insuffisante",
+		"Opération non supportée or non implémentée sur cette plateforme",
+		"Autre erreur",
+	}, { /* Russian (ru) */
+		"Успех",
+		"Ошибка ввода/вывода",
+		"Неверный параметр",
+		"Доступ запрещён (не хватает прав)",
+		"Устройство отсутствует (возможно, оно было отсоединено)",
+		"Элемент не найден",
+		"Ресурс занят",
+		"Истекло время ожидания операции",
+		"Переполнение",
+		"Ошибка канала",
+		"Системный вызов прерван (возможно, сигналом)",
+		"Память исчерпана",
+		"Операция не поддерживается данной платформой",
+		"Неизвестная ошибка"
+	}
+};
+
+/** \ingroup libusb_misc
+ * Set the language, and only the language, not the encoding! used for
+ * translatable libusb messages.
+ *
+ * This takes a locale string in the default setlocale format: lang[-region]
+ * or lang[_country_region][.codeset]. Only the lang part of the string is
+ * used, and only 2 letter ISO 639-1 codes are accepted for it, such as "de".
+ * The optional region, country_region or codeset parts are ignored. This
+ * means that functions which return translatable strings will NOT honor the
+ * specified encoding. 
+ * All strings returned are encoded as UTF-8 strings.
+ *
+ * If libusb_setlocale() is not called, all messages will be in English.
+ *
+ * The following functions return translatable strings: libusb_strerror().
+ * Note that the libusb log messages controlled through libusb_set_debug()
+ * are not translated, they are always in English.
+ *
+ * For POSIX UTF-8 environments if you want libusb to follow the standard
+ * locale settings, call libusb_setlocale(setlocale(LC_MESSAGES, NULL)),
+ * after your app has done its locale setup.
+ *
+ * \param locale locale-string in the form of lang[_country_region][.codeset]
+ * or lang[-region], where lang is a 2 letter ISO 639-1 code
+ * \returns LIBUSB_SUCCESS on success
+ * \returns LIBUSB_ERROR_INVALID_PARAM if the locale doesn't meet the requirements
+ * \returns LIBUSB_ERROR_NOT_FOUND if the requested language is not supported
+ * \returns a LIBUSB_ERROR code on other errors
+ */
+
+int API_EXPORTED libusb_setlocale(const char *locale)
+{
+	size_t i;
+
+	if ( (locale == NULL) || (strlen(locale) < 2)
+	  || ((strlen(locale) > 2) && (locale[2] != '-') && (locale[2] != '_') && (locale[2] != '.')) )
+		return LIBUSB_ERROR_INVALID_PARAM;
+
+	for (i=0; i<ARRAYSIZE(usbi_locale_supported); i++) {
+		if (strncasecmp(usbi_locale_supported[i], locale, 2) == 0)
+			break;
+	}
+	if (i >= ARRAYSIZE(usbi_locale_supported)) {
+		return LIBUSB_ERROR_NOT_FOUND;
+	}
+
+	usbi_locale = i;
+
+	return LIBUSB_SUCCESS;
+}
+
+/** \ingroup libusb_misc
+ * Returns a constant string with a short description of the given error code,
+ * this description is intended for displaying to the end user and will be in
+ * the language set by libusb_setlocale().
+ *
+ * The returned string is encoded in UTF-8.
+ *
+ * The messages always start with a capital letter and end without any dot.
+ * The caller must not free() the returned string.
+ *
+ * \param errcode the error code whose description is desired
+ * \returns a short description of the error code in UTF-8 encoding
+ */
+DEFAULT_VISIBILITY const char* LIBUSB_CALL libusb_strerror(enum libusb_error errcode)
+{
+	int errcode_index = -errcode;
+
+	if ((errcode_index < 0) || (errcode_index >= LIBUSB_ERROR_COUNT)) {
+		/* "Other Error", which should always be our last message, is returned */
+		errcode_index = LIBUSB_ERROR_COUNT - 1;
+	}
+
+	return usbi_localized_errors[usbi_locale][errcode_index];
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/sync.c

@@ -0,0 +1,327 @@
+/*
+ * Synchronous I/O functions for libusb
+ * Copyright © 2007-2008 Daniel Drake <dsd@gentoo.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libusbi.h"
+
+/**
+ * @defgroup libusb_syncio Synchronous device I/O
+ *
+ * This page documents libusb's synchronous (blocking) API for USB device I/O.
+ * This interface is easy to use but has some limitations. More advanced users
+ * may wish to consider using the \ref libusb_asyncio "asynchronous I/O API" instead.
+ */
+
+static void LIBUSB_CALL sync_transfer_cb(struct libusb_transfer *transfer)
+{
+	int *completed = transfer->user_data;
+	*completed = 1;
+	usbi_dbg("actual_length=%d", transfer->actual_length);
+	/* caller interprets result and frees transfer */
+}
+
+static void sync_transfer_wait_for_completion(struct libusb_transfer *transfer)
+{
+	int r, *completed = transfer->user_data;
+	struct libusb_context *ctx = HANDLE_CTX(transfer->dev_handle);
+
+	while (!*completed) {
+		r = libusb_handle_events_completed(ctx, completed);
+		if (r < 0) {
+			if (r == LIBUSB_ERROR_INTERRUPTED)
+				continue;
+			usbi_err(ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
+				 libusb_error_name(r));
+			libusb_cancel_transfer(transfer);
+			continue;
+		}
+	}
+}
+
+/** \ingroup libusb_syncio
+ * Perform a USB control transfer.
+ *
+ * The direction of the transfer is inferred from the bmRequestType field of
+ * the setup packet.
+ *
+ * The wValue, wIndex and wLength fields values should be given in host-endian
+ * byte order.
+ *
+ * \param dev_handle a handle for the device to communicate with
+ * \param bmRequestType the request type field for the setup packet
+ * \param bRequest the request field for the setup packet
+ * \param wValue the value field for the setup packet
+ * \param wIndex the index field for the setup packet
+ * \param data a suitably-sized data buffer for either input or output
+ * (depending on direction bits within bmRequestType)
+ * \param wLength the length field for the setup packet. The data buffer should
+ * be at least this size.
+ * \param timeout timeout (in millseconds) that this function should wait
+ * before giving up due to no response being received. For an unlimited
+ * timeout, use value 0.
+ * \returns on success, the number of bytes actually transferred
+ * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out
+ * \returns LIBUSB_ERROR_PIPE if the control request was not supported by the
+ * device
+ * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
+ * \returns LIBUSB_ERROR_BUSY if called from event handling context
+ * \returns LIBUSB_ERROR_INVALID_PARAM if the transfer size is larger than
+ * the operating system and/or hardware can support
+ * \returns another LIBUSB_ERROR code on other failures
+ */
+int API_EXPORTED libusb_control_transfer(libusb_device_handle *dev_handle,
+	uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
+	unsigned char *data, uint16_t wLength, unsigned int timeout)
+{
+	struct libusb_transfer *transfer;
+	unsigned char *buffer;
+	int completed = 0;
+	int r;
+
+	if (usbi_handling_events(HANDLE_CTX(dev_handle)))
+		return LIBUSB_ERROR_BUSY;
+
+	transfer = libusb_alloc_transfer(0);
+	if (!transfer)
+		return LIBUSB_ERROR_NO_MEM;
+
+	buffer = (unsigned char*) malloc(LIBUSB_CONTROL_SETUP_SIZE + wLength);
+	if (!buffer) {
+		libusb_free_transfer(transfer);
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	libusb_fill_control_setup(buffer, bmRequestType, bRequest, wValue, wIndex,
+		wLength);
+	if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_OUT)
+		memcpy(buffer + LIBUSB_CONTROL_SETUP_SIZE, data, wLength);
+
+	libusb_fill_control_transfer(transfer, dev_handle, buffer,
+		sync_transfer_cb, &completed, timeout);
+	transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER;
+	r = libusb_submit_transfer(transfer);
+	if (r < 0) {
+		libusb_free_transfer(transfer);
+		return r;
+	}
+
+	sync_transfer_wait_for_completion(transfer);
+
+	if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_IN)
+		memcpy(data, libusb_control_transfer_get_data(transfer),
+			transfer->actual_length);
+
+	switch (transfer->status) {
+	case LIBUSB_TRANSFER_COMPLETED:
+		r = transfer->actual_length;
+		break;
+	case LIBUSB_TRANSFER_TIMED_OUT:
+		r = LIBUSB_ERROR_TIMEOUT;
+		break;
+	case LIBUSB_TRANSFER_STALL:
+		r = LIBUSB_ERROR_PIPE;
+		break;
+	case LIBUSB_TRANSFER_NO_DEVICE:
+		r = LIBUSB_ERROR_NO_DEVICE;
+		break;
+	case LIBUSB_TRANSFER_OVERFLOW:
+		r = LIBUSB_ERROR_OVERFLOW;
+		break;
+	case LIBUSB_TRANSFER_ERROR:
+	case LIBUSB_TRANSFER_CANCELLED:
+		r = LIBUSB_ERROR_IO;
+		break;
+	default:
+		usbi_warn(HANDLE_CTX(dev_handle),
+			"unrecognised status code %d", transfer->status);
+		r = LIBUSB_ERROR_OTHER;
+	}
+
+	libusb_free_transfer(transfer);
+	return r;
+}
+
+static int do_sync_bulk_transfer(struct libusb_device_handle *dev_handle,
+	unsigned char endpoint, unsigned char *buffer, int length,
+	int *transferred, unsigned int timeout, unsigned char type)
+{
+	struct libusb_transfer *transfer;
+	int completed = 0;
+	int r;
+
+	if (usbi_handling_events(HANDLE_CTX(dev_handle)))
+		return LIBUSB_ERROR_BUSY;
+
+	transfer = libusb_alloc_transfer(0);
+	if (!transfer)
+		return LIBUSB_ERROR_NO_MEM;
+
+	libusb_fill_bulk_transfer(transfer, dev_handle, endpoint, buffer, length,
+		sync_transfer_cb, &completed, timeout);
+	transfer->type = type;
+
+	r = libusb_submit_transfer(transfer);
+	if (r < 0) {
+		libusb_free_transfer(transfer);
+		return r;
+	}
+
+	sync_transfer_wait_for_completion(transfer);
+
+	if (transferred)
+		*transferred = transfer->actual_length;
+
+	switch (transfer->status) {
+	case LIBUSB_TRANSFER_COMPLETED:
+		r = 0;
+		break;
+	case LIBUSB_TRANSFER_TIMED_OUT:
+		r = LIBUSB_ERROR_TIMEOUT;
+		break;
+	case LIBUSB_TRANSFER_STALL:
+		r = LIBUSB_ERROR_PIPE;
+		break;
+	case LIBUSB_TRANSFER_OVERFLOW:
+		r = LIBUSB_ERROR_OVERFLOW;
+		break;
+	case LIBUSB_TRANSFER_NO_DEVICE:
+		r = LIBUSB_ERROR_NO_DEVICE;
+		break;
+	case LIBUSB_TRANSFER_ERROR:
+	case LIBUSB_TRANSFER_CANCELLED:
+		r = LIBUSB_ERROR_IO;
+		break;
+	default:
+		usbi_warn(HANDLE_CTX(dev_handle),
+			"unrecognised status code %d", transfer->status);
+		r = LIBUSB_ERROR_OTHER;
+	}
+
+	libusb_free_transfer(transfer);
+	return r;
+}
+
+/** \ingroup libusb_syncio
+ * Perform a USB bulk transfer. The direction of the transfer is inferred from
+ * the direction bits of the endpoint address.
+ *
+ * For bulk reads, the <tt>length</tt> field indicates the maximum length of
+ * data you are expecting to receive. If less data arrives than expected,
+ * this function will return that data, so be sure to check the
+ * <tt>transferred</tt> output parameter.
+ *
+ * You should also check the <tt>transferred</tt> parameter for bulk writes.
+ * Not all of the data may have been written.
+ *
+ * Also check <tt>transferred</tt> when dealing with a timeout error code.
+ * libusb may have to split your transfer into a number of chunks to satisfy
+ * underlying O/S requirements, meaning that the timeout may expire after
+ * the first few chunks have completed. libusb is careful not to lose any data
+ * that may have been transferred; do not assume that timeout conditions
+ * indicate a complete lack of I/O.
+ *
+ * \param dev_handle a handle for the device to communicate with
+ * \param endpoint the address of a valid endpoint to communicate with
+ * \param data a suitably-sized data buffer for either input or output
+ * (depending on endpoint)
+ * \param length for bulk writes, the number of bytes from data to be sent. for
+ * bulk reads, the maximum number of bytes to receive into the data buffer.
+ * \param transferred output location for the number of bytes actually
+ * transferred. Since version 1.0.21 (\ref LIBUSB_API_VERSION >= 0x01000105),
+ * it is legal to pass a NULL pointer if you do not wish to receive this
+ * information.
+ * \param timeout timeout (in millseconds) that this function should wait
+ * before giving up due to no response being received. For an unlimited
+ * timeout, use value 0.
+ *
+ * \returns 0 on success (and populates <tt>transferred</tt>)
+ * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out (and populates
+ * <tt>transferred</tt>)
+ * \returns LIBUSB_ERROR_PIPE if the endpoint halted
+ * \returns LIBUSB_ERROR_OVERFLOW if the device offered more data, see
+ * \ref libusb_packetoverflow
+ * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
+ * \returns LIBUSB_ERROR_BUSY if called from event handling context
+ * \returns another LIBUSB_ERROR code on other failures
+ */
+int API_EXPORTED libusb_bulk_transfer(struct libusb_device_handle *dev_handle,
+	unsigned char endpoint, unsigned char *data, int length, int *transferred,
+	unsigned int timeout)
+{
+	return do_sync_bulk_transfer(dev_handle, endpoint, data, length,
+		transferred, timeout, LIBUSB_TRANSFER_TYPE_BULK);
+}
+
+/** \ingroup libusb_syncio
+ * Perform a USB interrupt transfer. The direction of the transfer is inferred
+ * from the direction bits of the endpoint address.
+ *
+ * For interrupt reads, the <tt>length</tt> field indicates the maximum length
+ * of data you are expecting to receive. If less data arrives than expected,
+ * this function will return that data, so be sure to check the
+ * <tt>transferred</tt> output parameter.
+ *
+ * You should also check the <tt>transferred</tt> parameter for interrupt
+ * writes. Not all of the data may have been written.
+ *
+ * Also check <tt>transferred</tt> when dealing with a timeout error code.
+ * libusb may have to split your transfer into a number of chunks to satisfy
+ * underlying O/S requirements, meaning that the timeout may expire after
+ * the first few chunks have completed. libusb is careful not to lose any data
+ * that may have been transferred; do not assume that timeout conditions
+ * indicate a complete lack of I/O.
+ *
+ * The default endpoint bInterval value is used as the polling interval.
+ *
+ * \param dev_handle a handle for the device to communicate with
+ * \param endpoint the address of a valid endpoint to communicate with
+ * \param data a suitably-sized data buffer for either input or output
+ * (depending on endpoint)
+ * \param length for bulk writes, the number of bytes from data to be sent. for
+ * bulk reads, the maximum number of bytes to receive into the data buffer.
+ * \param transferred output location for the number of bytes actually
+ * transferred. Since version 1.0.21 (\ref LIBUSB_API_VERSION >= 0x01000105),
+ * it is legal to pass a NULL pointer if you do not wish to receive this
+ * information.
+ * \param timeout timeout (in millseconds) that this function should wait
+ * before giving up due to no response being received. For an unlimited
+ * timeout, use value 0.
+ *
+ * \returns 0 on success (and populates <tt>transferred</tt>)
+ * \returns LIBUSB_ERROR_TIMEOUT if the transfer timed out
+ * \returns LIBUSB_ERROR_PIPE if the endpoint halted
+ * \returns LIBUSB_ERROR_OVERFLOW if the device offered more data, see
+ * \ref libusb_packetoverflow
+ * \returns LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
+ * \returns LIBUSB_ERROR_BUSY if called from event handling context
+ * \returns another LIBUSB_ERROR code on other error
+ */
+int API_EXPORTED libusb_interrupt_transfer(
+	struct libusb_device_handle *dev_handle, unsigned char endpoint,
+	unsigned char *data, int length, int *transferred, unsigned int timeout)
+{
+	return do_sync_bulk_transfer(dev_handle, endpoint, data, length,
+		transferred, timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT);
+}

vendor/github.com/karalabe/gousb/internal/libusb/libusb/version.h

@@ -0,0 +1,18 @@
+/* This file is parsed by m4 and windres and RC.EXE so please keep it simple. */
+#include "version_nano.h"
+#ifndef LIBUSB_MAJOR
+#define LIBUSB_MAJOR 1
+#endif
+#ifndef LIBUSB_MINOR
+#define LIBUSB_MINOR 0
+#endif
+#ifndef LIBUSB_MICRO
+#define LIBUSB_MICRO 21
+#endif
+#ifndef LIBUSB_NANO
+#define LIBUSB_NANO 0
+#endif
+/* LIBUSB_RC is the release candidate suffix. Should normally be empty. */
+#ifndef LIBUSB_RC
+#define LIBUSB_RC ""
+#endif

vendor/github.com/karalabe/gousb/internal/libusb/libusb/version_nano.h

@@ -0,0 +1 @@
+#define LIBUSB_NANO 11182

vendor/github.com/karalabe/gousb/usb/config.go

@@ -0,0 +1,153 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+/*
+#ifndef OS_WINDOWS
+	#include "os/threads_posix.h"
+#endif
+#include "libusbi.h"
+#include "libusb.h"
+*/
+import "C"
+
+import (
+	"fmt"
+	"reflect"
+	"unsafe"
+)
+
+type EndpointInfo struct {
+	Address       uint8
+	Attributes    uint8
+	MaxPacketSize uint16
+	MaxIsoPacket  uint32
+	PollInterval  uint8
+	RefreshRate   uint8
+	SynchAddress  uint8
+}
+
+func (e EndpointInfo) Number() int {
+	return int(e.Address) & ENDPOINT_NUM_MASK
+}
+
+func (e EndpointInfo) Direction() EndpointDirection {
+	return EndpointDirection(e.Address) & ENDPOINT_DIR_MASK
+}
+
+func (e EndpointInfo) String() string {
+	return fmt.Sprintf("Endpoint %d %-3s %s - %s %s [%d %d]",
+		e.Number(), e.Direction(),
+		TransferType(e.Attributes)&TRANSFER_TYPE_MASK,
+		IsoSyncType(e.Attributes)&ISO_SYNC_TYPE_MASK,
+		IsoUsageType(e.Attributes)&ISO_USAGE_TYPE_MASK,
+		e.MaxPacketSize, e.MaxIsoPacket,
+	)
+}
+
+type InterfaceInfo struct {
+	Number uint8
+	Setups []InterfaceSetup
+}
+
+func (i InterfaceInfo) String() string {
+	return fmt.Sprintf("Interface %02x (%d setups)", i.Number, len(i.Setups))
+}
+
+type InterfaceSetup struct {
+	Number     uint8
+	Alternate  uint8
+	IfClass    uint8
+	IfSubClass uint8
+	IfProtocol uint8
+	Endpoints  []EndpointInfo
+}
+
+func (a InterfaceSetup) String() string {
+	return fmt.Sprintf("Interface %02x Setup %02x", a.Number, a.Alternate)
+}
+
+type ConfigInfo struct {
+	Config     uint8
+	Attributes uint8
+	MaxPower   uint8
+	Interfaces []InterfaceInfo
+}
+
+func (c ConfigInfo) String() string {
+	return fmt.Sprintf("Config %02x", c.Config)
+}
+
+func newConfig(dev *C.libusb_device, cfg *C.struct_libusb_config_descriptor) ConfigInfo {
+	c := ConfigInfo{
+		Config:     uint8(cfg.bConfigurationValue),
+		Attributes: uint8(cfg.bmAttributes),
+		MaxPower:   uint8(cfg.MaxPower),
+	}
+
+	var ifaces []C.struct_libusb_interface
+	*(*reflect.SliceHeader)(unsafe.Pointer(&ifaces)) = reflect.SliceHeader{
+		Data: uintptr(unsafe.Pointer(cfg._interface)),
+		Len:  int(cfg.bNumInterfaces),
+		Cap:  int(cfg.bNumInterfaces),
+	}
+	c.Interfaces = make([]InterfaceInfo, 0, len(ifaces))
+	for _, iface := range ifaces {
+		if iface.num_altsetting == 0 {
+			continue
+		}
+
+		var alts []C.struct_libusb_interface_descriptor
+		*(*reflect.SliceHeader)(unsafe.Pointer(&alts)) = reflect.SliceHeader{
+			Data: uintptr(unsafe.Pointer(iface.altsetting)),
+			Len:  int(iface.num_altsetting),
+			Cap:  int(iface.num_altsetting),
+		}
+		descs := make([]InterfaceSetup, 0, len(alts))
+		for _, alt := range alts {
+			i := InterfaceSetup{
+				Number:     uint8(alt.bInterfaceNumber),
+				Alternate:  uint8(alt.bAlternateSetting),
+				IfClass:    uint8(alt.bInterfaceClass),
+				IfSubClass: uint8(alt.bInterfaceSubClass),
+				IfProtocol: uint8(alt.bInterfaceProtocol),
+			}
+			var ends []C.struct_libusb_endpoint_descriptor
+			*(*reflect.SliceHeader)(unsafe.Pointer(&ends)) = reflect.SliceHeader{
+				Data: uintptr(unsafe.Pointer(alt.endpoint)),
+				Len:  int(alt.bNumEndpoints),
+				Cap:  int(alt.bNumEndpoints),
+			}
+			i.Endpoints = make([]EndpointInfo, 0, len(ends))
+			for _, end := range ends {
+				i.Endpoints = append(i.Endpoints, EndpointInfo{
+					Address:       uint8(end.bEndpointAddress),
+					Attributes:    uint8(end.bmAttributes),
+					MaxPacketSize: uint16(end.wMaxPacketSize),
+					//MaxIsoPacket:  uint32(C.libusb_get_max_iso_packet_size(dev, C.uchar(end.bEndpointAddress))),
+					PollInterval: uint8(end.bInterval),
+					RefreshRate:  uint8(end.bRefresh),
+					SynchAddress: uint8(end.bSynchAddress),
+				})
+			}
+			descs = append(descs, i)
+		}
+		c.Interfaces = append(c.Interfaces, InterfaceInfo{
+			Number: descs[0].Number,
+			Setups: descs,
+		})
+	}
+	return c
+}

vendor/github.com/karalabe/gousb/usb/constants.go

@@ -0,0 +1,183 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+// #include "libusb.h"
+import "C"
+
+type Class uint8
+
+const (
+	CLASS_PER_INTERFACE Class = C.LIBUSB_CLASS_PER_INTERFACE
+	CLASS_AUDIO         Class = C.LIBUSB_CLASS_AUDIO
+	CLASS_COMM          Class = C.LIBUSB_CLASS_COMM
+	CLASS_HID           Class = C.LIBUSB_CLASS_HID
+	CLASS_PRINTER       Class = C.LIBUSB_CLASS_PRINTER
+	CLASS_PTP           Class = C.LIBUSB_CLASS_PTP
+	CLASS_MASS_STORAGE  Class = C.LIBUSB_CLASS_MASS_STORAGE
+	CLASS_HUB           Class = C.LIBUSB_CLASS_HUB
+	CLASS_DATA          Class = C.LIBUSB_CLASS_DATA
+	CLASS_WIRELESS      Class = C.LIBUSB_CLASS_WIRELESS
+	CLASS_APPLICATION   Class = C.LIBUSB_CLASS_APPLICATION
+	CLASS_VENDOR_SPEC   Class = C.LIBUSB_CLASS_VENDOR_SPEC
+)
+
+var classDescription = map[Class]string{
+	CLASS_PER_INTERFACE: "per-interface",
+	CLASS_AUDIO:         "audio",
+	CLASS_COMM:          "communications",
+	CLASS_HID:           "human interface device",
+	CLASS_PRINTER:       "printer dclass",
+	CLASS_PTP:           "picture transfer protocol",
+	CLASS_MASS_STORAGE:  "mass storage",
+	CLASS_HUB:           "hub",
+	CLASS_DATA:          "data",
+	CLASS_WIRELESS:      "wireless",
+	CLASS_APPLICATION:   "application",
+	CLASS_VENDOR_SPEC:   "vendor-specific",
+}
+
+func (c Class) String() string {
+	return classDescription[c]
+}
+
+type DescriptorType uint8
+
+const (
+	DT_DEVICE    DescriptorType = C.LIBUSB_DT_DEVICE
+	DT_CONFIG    DescriptorType = C.LIBUSB_DT_CONFIG
+	DT_STRING    DescriptorType = C.LIBUSB_DT_STRING
+	DT_INTERFACE DescriptorType = C.LIBUSB_DT_INTERFACE
+	DT_ENDPOINT  DescriptorType = C.LIBUSB_DT_ENDPOINT
+	DT_HID       DescriptorType = C.LIBUSB_DT_HID
+	DT_REPORT    DescriptorType = C.LIBUSB_DT_REPORT
+	DT_PHYSICAL  DescriptorType = C.LIBUSB_DT_PHYSICAL
+	DT_HUB       DescriptorType = C.LIBUSB_DT_HUB
+)
+
+var descriptorTypeDescription = map[DescriptorType]string{
+	DT_DEVICE:    "device",
+	DT_CONFIG:    "configuration",
+	DT_STRING:    "string",
+	DT_INTERFACE: "interface",
+	DT_ENDPOINT:  "endpoint",
+	DT_HID:       "HID",
+	DT_REPORT:    "HID report",
+	DT_PHYSICAL:  "physical",
+	DT_HUB:       "hub",
+}
+
+func (dt DescriptorType) String() string {
+	return descriptorTypeDescription[dt]
+}
+
+type EndpointDirection uint8
+
+const (
+	ENDPOINT_NUM_MASK                   = 0x03
+	ENDPOINT_DIR_IN   EndpointDirection = C.LIBUSB_ENDPOINT_IN
+	ENDPOINT_DIR_OUT  EndpointDirection = C.LIBUSB_ENDPOINT_OUT
+	ENDPOINT_DIR_MASK EndpointDirection = 0x80
+)
+
+var endpointDirectionDescription = map[EndpointDirection]string{
+	ENDPOINT_DIR_IN:  "IN",
+	ENDPOINT_DIR_OUT: "OUT",
+}
+
+func (ed EndpointDirection) String() string {
+	return endpointDirectionDescription[ed]
+}
+
+type TransferType uint8
+
+const (
+	TRANSFER_TYPE_CONTROL     TransferType = C.LIBUSB_TRANSFER_TYPE_CONTROL
+	TRANSFER_TYPE_ISOCHRONOUS TransferType = C.LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
+	TRANSFER_TYPE_BULK        TransferType = C.LIBUSB_TRANSFER_TYPE_BULK
+	TRANSFER_TYPE_INTERRUPT   TransferType = C.LIBUSB_TRANSFER_TYPE_INTERRUPT
+	TRANSFER_TYPE_MASK        TransferType = 0x03
+)
+
+var transferTypeDescription = map[TransferType]string{
+	TRANSFER_TYPE_CONTROL:     "control",
+	TRANSFER_TYPE_ISOCHRONOUS: "isochronous",
+	TRANSFER_TYPE_BULK:        "bulk",
+	TRANSFER_TYPE_INTERRUPT:   "interrupt",
+}
+
+func (tt TransferType) String() string {
+	return transferTypeDescription[tt]
+}
+
+type IsoSyncType uint8
+
+const (
+	ISO_SYNC_TYPE_NONE     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_NONE << 2
+	ISO_SYNC_TYPE_ASYNC    IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ASYNC << 2
+	ISO_SYNC_TYPE_ADAPTIVE IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_ADAPTIVE << 2
+	ISO_SYNC_TYPE_SYNC     IsoSyncType = C.LIBUSB_ISO_SYNC_TYPE_SYNC << 2
+	ISO_SYNC_TYPE_MASK     IsoSyncType = 0x0C
+)
+
+var isoSyncTypeDescription = map[IsoSyncType]string{
+	ISO_SYNC_TYPE_NONE:     "unsynchronized",
+	ISO_SYNC_TYPE_ASYNC:    "asynchronous",
+	ISO_SYNC_TYPE_ADAPTIVE: "adaptive",
+	ISO_SYNC_TYPE_SYNC:     "synchronous",
+}
+
+func (ist IsoSyncType) String() string {
+	return isoSyncTypeDescription[ist]
+}
+
+type IsoUsageType uint8
+
+const (
+	ISO_USAGE_TYPE_DATA     IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_DATA << 4
+	ISO_USAGE_TYPE_FEEDBACK IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_FEEDBACK << 4
+	ISO_USAGE_TYPE_IMPLICIT IsoUsageType = C.LIBUSB_ISO_USAGE_TYPE_IMPLICIT << 4
+	ISO_USAGE_TYPE_MASK     IsoUsageType = 0x30
+)
+
+var isoUsageTypeDescription = map[IsoUsageType]string{
+	ISO_USAGE_TYPE_DATA:     "data",
+	ISO_USAGE_TYPE_FEEDBACK: "feedback",
+	ISO_USAGE_TYPE_IMPLICIT: "implicit data",
+}
+
+func (iut IsoUsageType) String() string {
+	return isoUsageTypeDescription[iut]
+}
+
+type RequestType uint8
+
+const (
+	REQUEST_TYPE_STANDARD = C.LIBUSB_REQUEST_TYPE_STANDARD
+	REQUEST_TYPE_CLASS    = C.LIBUSB_REQUEST_TYPE_CLASS
+	REQUEST_TYPE_VENDOR   = C.LIBUSB_REQUEST_TYPE_VENDOR
+	REQUEST_TYPE_RESERVED = C.LIBUSB_REQUEST_TYPE_RESERVED
+)
+
+var requestTypeDescription = map[RequestType]string{
+	REQUEST_TYPE_STANDARD: "standard",
+	REQUEST_TYPE_CLASS:    "class",
+	REQUEST_TYPE_VENDOR:   "vendor",
+	REQUEST_TYPE_RESERVED: "reserved",
+}
+
+func (rt RequestType) String() string {
+	return requestTypeDescription[rt]
+}

vendor/github.com/karalabe/gousb/usb/debug.go

@@ -0,0 +1,36 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+// To enable internal debugging:
+//   -ldflags "-X github.com/karalabe/gousb/usb.debugInternal true"
+
+import (
+	"io"
+	"io/ioutil"
+	"log" // TODO(kevlar): make a logger
+	"os"
+)
+
+var debug *log.Logger
+var debugInternal string
+
+func init() {
+	var out io.Writer = ioutil.Discard
+	if debugInternal != "" {
+		out = os.Stderr
+	}
+	debug = log.New(out, "usb", log.LstdFlags|log.Lshortfile)
+}

vendor/github.com/karalabe/gousb/usb/descriptor.go

@@ -0,0 +1,77 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+/*
+#ifndef OS_WINDOWS
+	#include "os/threads_posix.h"
+#endif
+#include "libusbi.h"
+#include "libusb.h"
+*/
+import "C"
+
+type Descriptor struct {
+	// Bus information
+	Bus     uint8 // The bus on which the device was detected
+	Address uint8 // The address of the device on the bus
+
+	// Version information
+	Spec   BCD // USB Specification Release Number
+	Device BCD // The device version
+
+	// Product information
+	Vendor  ID // The Vendor identifer
+	Product ID // The Product identifier
+
+	// Protocol information
+	Class    uint8 // The class of this device
+	SubClass uint8 // The sub-class (within the class) of this device
+	Protocol uint8 // The protocol (within the sub-class) of this device
+
+	// Configuration information
+	Configs []ConfigInfo
+}
+
+func newDescriptor(dev *C.libusb_device) (*Descriptor, error) {
+	var desc C.struct_libusb_device_descriptor
+	if errno := C.libusb_get_device_descriptor(dev, &desc); errno < 0 {
+		return nil, usbError(errno)
+	}
+
+	// Enumerate configurations
+	var cfgs []ConfigInfo
+	for i := 0; i < int(desc.bNumConfigurations); i++ {
+		var cfg *C.struct_libusb_config_descriptor
+		if errno := C.libusb_get_config_descriptor(dev, C.uint8_t(i), &cfg); errno < 0 {
+			return nil, usbError(errno)
+		}
+		cfgs = append(cfgs, newConfig(dev, cfg))
+		C.libusb_free_config_descriptor(cfg)
+	}
+
+	return &Descriptor{
+		Bus:      uint8(C.libusb_get_bus_number(dev)),
+		Address:  uint8(C.libusb_get_device_address(dev)),
+		Spec:     BCD(desc.bcdUSB),
+		Device:   BCD(desc.bcdDevice),
+		Vendor:   ID(desc.idVendor),
+		Product:  ID(desc.idProduct),
+		Class:    uint8(desc.bDeviceClass),
+		SubClass: uint8(desc.bDeviceSubClass),
+		Protocol: uint8(desc.bDeviceProtocol),
+		Configs:  cfgs,
+	}, nil
+}

vendor/github.com/karalabe/gousb/usb/device.go

@@ -0,0 +1,295 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+/*
+#ifndef OS_WINDOWS
+	#include "os/threads_posix.h"
+#endif
+#include "libusbi.h"
+#include "libusb.h"
+*/
+import "C"
+
+import (
+	"fmt"
+	"reflect"
+	"sync"
+	"time"
+	"unsafe"
+)
+
+var DefaultReadTimeout = 1 * time.Second
+var DefaultWriteTimeout = 1 * time.Second
+var DefaultControlTimeout = 250 * time.Millisecond //5 * time.Second
+
+type Device struct {
+	handle *C.libusb_device_handle
+
+	// Embed the device information for easy access
+	*Descriptor
+
+	// Timeouts
+	ReadTimeout    time.Duration
+	WriteTimeout   time.Duration
+	ControlTimeout time.Duration
+
+	// Claimed interfaces
+	lock    *sync.Mutex
+	claimed map[uint8]int
+
+	// Detached kernel interfaces
+	detached map[uint8]int
+}
+
+func newDevice(handle *C.libusb_device_handle, desc *Descriptor) (*Device, error) {
+	ifaces := 0
+	d := &Device{
+		handle:         handle,
+		Descriptor:     desc,
+		ReadTimeout:    DefaultReadTimeout,
+		WriteTimeout:   DefaultWriteTimeout,
+		ControlTimeout: DefaultControlTimeout,
+		lock:           new(sync.Mutex),
+		claimed:        make(map[uint8]int, ifaces),
+		detached:       make(map[uint8]int),
+	}
+
+	if err := d.detachKernelDriver(); err != nil {
+		d.Close()
+		return nil, err
+	}
+
+	return d, nil
+}
+
+// detachKernelDriver detaches any active kernel drivers, if supported by the platform.
+// If there are any errors, like Context.ListDevices, only the final one will be returned.
+func (d *Device) detachKernelDriver() (err error) {
+	for _, cfg := range d.Configs {
+		for _, iface := range cfg.Interfaces {
+			switch activeErr := C.libusb_kernel_driver_active(d.handle, C.int(iface.Number)); activeErr {
+			case C.LIBUSB_ERROR_NOT_SUPPORTED:
+				// no need to do any futher checking, no platform support
+				return
+			case 0:
+				continue
+			case 1:
+				switch detachErr := C.libusb_detach_kernel_driver(d.handle, C.int(iface.Number)); detachErr {
+				case C.LIBUSB_ERROR_NOT_SUPPORTED:
+					// shouldn't ever get here, should be caught by the outer switch
+					return
+				case 0:
+					d.detached[iface.Number]++
+				case C.LIBUSB_ERROR_NOT_FOUND:
+					// this status is returned if libusb's driver is already attached to the device
+					d.detached[iface.Number]++
+				default:
+					err = fmt.Errorf("usb: detach kernel driver: %s", usbError(detachErr))
+				}
+			default:
+				err = fmt.Errorf("usb: active kernel driver check: %s", usbError(activeErr))
+			}
+		}
+	}
+
+	return
+}
+
+// attachKernelDriver re-attaches kernel drivers to any previously detached interfaces, if supported by the platform.
+// If there are any errors, like Context.ListDevices, only the final one will be returned.
+func (d *Device) attachKernelDriver() (err error) {
+	for iface := range d.detached {
+		switch attachErr := C.libusb_attach_kernel_driver(d.handle, C.int(iface)); attachErr {
+		case C.LIBUSB_ERROR_NOT_SUPPORTED:
+			// no need to do any futher checking, no platform support
+			return
+		case 0:
+			continue
+		default:
+			err = fmt.Errorf("usb: attach kernel driver: %s", usbError(attachErr))
+		}
+	}
+
+	return
+}
+
+func (d *Device) Reset() error {
+	if errno := C.libusb_reset_device(d.handle); errno != 0 {
+		return usbError(errno)
+	}
+	return nil
+}
+
+func (d *Device) Control(rType, request uint8, val, idx uint16, data []byte) (int, error) {
+	//log.Printf("control xfer: %d:%d/%d:%d %x", idx, rType, request, val, string(data))
+	dataSlice := (*reflect.SliceHeader)(unsafe.Pointer(&data))
+	n := C.libusb_control_transfer(
+		d.handle,
+		C.uint8_t(rType),
+		C.uint8_t(request),
+		C.uint16_t(val),
+		C.uint16_t(idx),
+		(*C.uchar)(unsafe.Pointer(dataSlice.Data)),
+		C.uint16_t(len(data)),
+		C.uint(d.ControlTimeout/time.Millisecond))
+	if n < 0 {
+		return int(n), usbError(n)
+	}
+	return int(n), nil
+}
+
+// ActiveConfig returns the config id (not the index) of the active configuration.
+// This corresponds to the ConfigInfo.Config field.
+func (d *Device) ActiveConfig() (uint8, error) {
+	var cfg C.int
+	if errno := C.libusb_get_configuration(d.handle, &cfg); errno < 0 {
+		return 0, usbError(errno)
+	}
+	return uint8(cfg), nil
+}
+
+// SetConfig attempts to change the active configuration.
+// The cfg provided is the config id (not the index) of the configuration to set,
+// which corresponds to the ConfigInfo.Config field.
+func (d *Device) SetConfig(cfg uint8) error {
+	if errno := C.libusb_set_configuration(d.handle, C.int(cfg)); errno < 0 {
+		return usbError(errno)
+	}
+	return nil
+}
+
+// Close the device.
+func (d *Device) Close() error {
+	if d.handle == nil {
+		return fmt.Errorf("usb: double close on device")
+	}
+	d.lock.Lock()
+	defer d.lock.Unlock()
+	for iface := range d.claimed {
+		C.libusb_release_interface(d.handle, C.int(iface))
+	}
+	d.attachKernelDriver()
+	C.libusb_close(d.handle)
+	d.handle = nil
+	return nil
+}
+
+func (d *Device) OpenEndpoint(conf, iface, setup, epoint uint8) (Endpoint, error) {
+	end := &endpoint{
+		Device: d,
+	}
+
+	var setAlternate bool
+	for _, c := range d.Configs {
+		if c.Config != conf {
+			continue
+		}
+		debug.Printf("found conf: %#v\n", c)
+		for _, i := range c.Interfaces {
+			if i.Number != iface {
+				continue
+			}
+			debug.Printf("found iface: %#v\n", i)
+			for i, s := range i.Setups {
+				if s.Alternate != setup {
+					continue
+				}
+				setAlternate = i != 0
+
+				debug.Printf("found setup: %#v [default: %v]\n", s, !setAlternate)
+				for _, e := range s.Endpoints {
+					debug.Printf("ep %02x search: %#v\n", epoint, s)
+					if e.Address != epoint {
+						continue
+					}
+					end.InterfaceSetup = s
+					end.EndpointInfo = e
+					switch tt := TransferType(e.Attributes) & TRANSFER_TYPE_MASK; tt {
+					case TRANSFER_TYPE_BULK:
+						end.xfer = bulk_xfer
+					case TRANSFER_TYPE_INTERRUPT:
+						end.xfer = interrupt_xfer
+					case TRANSFER_TYPE_ISOCHRONOUS:
+						end.xfer = isochronous_xfer
+					default:
+						return nil, fmt.Errorf("usb: %s transfer is unsupported", tt)
+					}
+					goto found
+				}
+				return nil, fmt.Errorf("usb: unknown endpoint %02x", epoint)
+			}
+			return nil, fmt.Errorf("usb: unknown setup %02x", setup)
+		}
+		return nil, fmt.Errorf("usb: unknown interface %02x", iface)
+	}
+	return nil, fmt.Errorf("usb: unknown configuration %02x", conf)
+
+found:
+
+	// Set the configuration
+	var activeConf C.int
+	if errno := C.libusb_get_configuration(d.handle, &activeConf); errno < 0 {
+		return nil, fmt.Errorf("usb: getcfg: %s", usbError(errno))
+	}
+	if int(activeConf) != int(conf) {
+		if errno := C.libusb_set_configuration(d.handle, C.int(conf)); errno < 0 {
+			return nil, fmt.Errorf("usb: setcfg: %s", usbError(errno))
+		}
+	}
+
+	// Claim the interface
+	if errno := C.libusb_claim_interface(d.handle, C.int(iface)); errno < 0 {
+		return nil, fmt.Errorf("usb: claim: %s", usbError(errno))
+	}
+
+	// Increment the claim count
+	d.lock.Lock()
+	d.claimed[iface]++
+	d.lock.Unlock() // unlock immediately because the next calls may block
+
+	// Choose the alternate
+	if setAlternate {
+		if errno := C.libusb_set_interface_alt_setting(d.handle, C.int(iface), C.int(setup)); errno < 0 {
+			debug.Printf("altsetting error: %s", usbError(errno))
+			return nil, fmt.Errorf("usb: setalt: %s", usbError(errno))
+		}
+	}
+
+	return end, nil
+}
+
+func (d *Device) GetStringDescriptor(desc_index int) (string, error) {
+
+	// allocate 200-byte array limited the length of string descriptor
+	goBuffer := make([]byte, 200)
+
+	// get string descriptor from libusb. if errno < 0 then there are any errors.
+	// if errno >= 0; it is a length of result string descriptor
+	errno := C.libusb_get_string_descriptor_ascii(
+		d.handle,
+		C.uint8_t(desc_index),
+		(*C.uchar)(unsafe.Pointer(&goBuffer[0])),
+		200)
+
+	// if any errors occur
+	if errno < 0 {
+		return "", fmt.Errorf("usb: getstr: %s", usbError(errno))
+	}
+	// convert slice of byte to string with limited length from errno
+	stringDescriptor := string(goBuffer[:errno])
+
+	return stringDescriptor, nil
+}

vendor/github.com/karalabe/gousb/usb/endpoint.go

@@ -0,0 +1,100 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+// #include "libusb.h"
+import "C"
+
+import (
+	"fmt"
+	"reflect"
+	"time"
+	"unsafe"
+)
+
+type Endpoint interface {
+	Read(b []byte) (int, error)
+	Write(b []byte) (int, error)
+	Interface() InterfaceSetup
+	Info() EndpointInfo
+}
+
+type endpoint struct {
+	*Device
+	InterfaceSetup
+	EndpointInfo
+	xfer func(*endpoint, []byte, time.Duration) (int, error)
+}
+
+func (e *endpoint) Read(buf []byte) (int, error) {
+	if EndpointDirection(e.Address)&ENDPOINT_DIR_MASK != ENDPOINT_DIR_IN {
+		return 0, fmt.Errorf("usb: read: not an IN endpoint")
+	}
+
+	return e.xfer(e, buf, e.ReadTimeout)
+}
+
+func (e *endpoint) Write(buf []byte) (int, error) {
+	if EndpointDirection(e.Address)&ENDPOINT_DIR_MASK != ENDPOINT_DIR_OUT {
+		return 0, fmt.Errorf("usb: write: not an OUT endpoint")
+	}
+
+	return e.xfer(e, buf, e.WriteTimeout)
+}
+
+func (e *endpoint) Interface() InterfaceSetup { return e.InterfaceSetup }
+func (e *endpoint) Info() EndpointInfo        { return e.EndpointInfo }
+
+// TODO(kevlar): (*Endpoint).Close
+
+func bulk_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
+	if len(buf) == 0 {
+		return 0, nil
+	}
+
+	data := (*reflect.SliceHeader)(unsafe.Pointer(&buf)).Data
+
+	var cnt C.int
+	if errno := C.libusb_bulk_transfer(
+		e.handle,
+		C.uchar(e.Address),
+		(*C.uchar)(unsafe.Pointer(data)),
+		C.int(len(buf)),
+		&cnt,
+		C.uint(timeout/time.Millisecond)); errno < 0 {
+		return 0, usbError(errno)
+	}
+	return int(cnt), nil
+}
+
+func interrupt_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
+	if len(buf) == 0 {
+		return 0, nil
+	}
+
+	data := (*reflect.SliceHeader)(unsafe.Pointer(&buf)).Data
+
+	var cnt C.int
+	if errno := C.libusb_interrupt_transfer(
+		e.handle,
+		C.uchar(e.Address),
+		(*C.uchar)(unsafe.Pointer(data)),
+		C.int(len(buf)),
+		&cnt,
+		C.uint(timeout/time.Millisecond)); errno < 0 {
+		return 0, usbError(errno)
+	}
+	return int(cnt), nil
+}

vendor/github.com/karalabe/gousb/usb/error.go

@@ -0,0 +1,92 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+import (
+	"fmt"
+)
+
+// #include "libusb.h"
+import "C"
+
+type usbError C.int
+
+func (e usbError) Error() string {
+	return fmt.Sprintf("libusb: %s [code %d]", usbErrorString[e], int(e))
+}
+
+const (
+	SUCCESS             usbError = C.LIBUSB_SUCCESS
+	ERROR_IO            usbError = C.LIBUSB_ERROR_IO
+	ERROR_INVALID_PARAM usbError = C.LIBUSB_ERROR_INVALID_PARAM
+	ERROR_ACCESS        usbError = C.LIBUSB_ERROR_ACCESS
+	ERROR_NO_DEVICE     usbError = C.LIBUSB_ERROR_NO_DEVICE
+	ERROR_NOT_FOUND     usbError = C.LIBUSB_ERROR_NOT_FOUND
+	ERROR_BUSY          usbError = C.LIBUSB_ERROR_BUSY
+	ERROR_TIMEOUT       usbError = C.LIBUSB_ERROR_TIMEOUT
+	ERROR_OVERFLOW      usbError = C.LIBUSB_ERROR_OVERFLOW
+	ERROR_PIPE          usbError = C.LIBUSB_ERROR_PIPE
+	ERROR_INTERRUPTED   usbError = C.LIBUSB_ERROR_INTERRUPTED
+	ERROR_NO_MEM        usbError = C.LIBUSB_ERROR_NO_MEM
+	ERROR_NOT_SUPPORTED usbError = C.LIBUSB_ERROR_NOT_SUPPORTED
+	ERROR_OTHER         usbError = C.LIBUSB_ERROR_OTHER
+)
+
+var usbErrorString = map[usbError]string{
+	C.LIBUSB_SUCCESS:             "success",
+	C.LIBUSB_ERROR_IO:            "i/o error",
+	C.LIBUSB_ERROR_INVALID_PARAM: "invalid param",
+	C.LIBUSB_ERROR_ACCESS:        "bad access",
+	C.LIBUSB_ERROR_NO_DEVICE:     "no device",
+	C.LIBUSB_ERROR_NOT_FOUND:     "not found",
+	C.LIBUSB_ERROR_BUSY:          "device or resource busy",
+	C.LIBUSB_ERROR_TIMEOUT:       "timeout",
+	C.LIBUSB_ERROR_OVERFLOW:      "overflow",
+	C.LIBUSB_ERROR_PIPE:          "pipe error",
+	C.LIBUSB_ERROR_INTERRUPTED:   "interrupted",
+	C.LIBUSB_ERROR_NO_MEM:        "out of memory",
+	C.LIBUSB_ERROR_NOT_SUPPORTED: "not supported",
+	C.LIBUSB_ERROR_OTHER:         "unknown error",
+}
+
+type TransferStatus uint8
+
+const (
+	LIBUSB_TRANSFER_COMPLETED TransferStatus = C.LIBUSB_TRANSFER_COMPLETED
+	LIBUSB_TRANSFER_ERROR     TransferStatus = C.LIBUSB_TRANSFER_ERROR
+	LIBUSB_TRANSFER_TIMED_OUT TransferStatus = C.LIBUSB_TRANSFER_TIMED_OUT
+	LIBUSB_TRANSFER_CANCELLED TransferStatus = C.LIBUSB_TRANSFER_CANCELLED
+	LIBUSB_TRANSFER_STALL     TransferStatus = C.LIBUSB_TRANSFER_STALL
+	LIBUSB_TRANSFER_NO_DEVICE TransferStatus = C.LIBUSB_TRANSFER_NO_DEVICE
+	LIBUSB_TRANSFER_OVERFLOW  TransferStatus = C.LIBUSB_TRANSFER_OVERFLOW
+)
+
+var transferStatusDescription = map[TransferStatus]string{
+	LIBUSB_TRANSFER_COMPLETED: "transfer completed without error",
+	LIBUSB_TRANSFER_ERROR:     "transfer failed",
+	LIBUSB_TRANSFER_TIMED_OUT: "transfer timed out",
+	LIBUSB_TRANSFER_CANCELLED: "transfer was cancelled",
+	LIBUSB_TRANSFER_STALL:     "halt condition detected (endpoint stalled) or control request not supported",
+	LIBUSB_TRANSFER_NO_DEVICE: "device was disconnected",
+	LIBUSB_TRANSFER_OVERFLOW:  "device sent more data than requested",
+}
+
+func (ts TransferStatus) String() string {
+	return transferStatusDescription[ts]
+}
+
+func (ts TransferStatus) Error() string {
+	return "libusb: " + ts.String()
+}

vendor/github.com/karalabe/gousb/usb/iso.c

@@ -0,0 +1,79 @@
+#include "libusb.h"
+#include <stdio.h>
+#include <string.h>
+
+void print_xfer(struct libusb_transfer *xfer);
+void iso_callback(void *);
+
+void callback(struct libusb_transfer *xfer) {
+	//printf("Callback!\n");
+	//print_xfer(xfer);
+	iso_callback(xfer->user_data);
+}
+
+int submit(struct libusb_transfer *xfer) {
+	xfer->callback = &callback;
+	xfer->status = -1;
+	//print_xfer(xfer);
+	//printf("Transfer submitted\n");
+
+	/* fake
+	strcpy(xfer->buffer, "hello");
+	xfer->actual_length = 5;
+	callback(xfer);
+	return 0; */
+	return libusb_submit_transfer(xfer);
+}
+
+void print_xfer(struct libusb_transfer *xfer) {
+	int i;
+
+	printf("Transfer:\n");
+	printf("  dev_handle:   %p\n", xfer->dev_handle);
+	printf("  flags:        %08x\n", xfer->flags);
+	printf("  endpoint:     %x\n", xfer->endpoint);
+	printf("  type:         %x\n", xfer->type);
+	printf("  timeout:      %dms\n", xfer->timeout);
+	printf("  status:       %x\n", xfer->status);
+	printf("  length:       %d (act: %d)\n", xfer->length, xfer->actual_length);
+	printf("  callback:     %p\n", xfer->callback);
+	printf("  user_data:    %p\n", xfer->user_data);
+	printf("  buffer:       %p\n", xfer->buffer);
+	printf("  num_iso_pkts: %d\n", xfer->num_iso_packets);
+	printf("  packets:\n");
+	for (i = 0; i < xfer->num_iso_packets; i++) {
+		printf("    [%04d] %d (act: %d) %x\n", i,
+			xfer->iso_packet_desc[i].length,
+			xfer->iso_packet_desc[i].actual_length,
+			xfer->iso_packet_desc[i].status);
+	}
+}
+
+int extract_data(struct libusb_transfer *xfer, void *raw, int max, unsigned char *status) {
+	int i;
+	int copied = 0;
+	unsigned char *in = xfer->buffer;
+	unsigned char *out = raw;
+	for (i = 0; i < xfer->num_iso_packets; i++) {
+		struct libusb_iso_packet_descriptor pkt = xfer->iso_packet_desc[i];
+
+		// Copy the data
+		int len = pkt.actual_length;
+		if (len > max) {
+			len = max;
+		}
+		memcpy(out, in, len);
+		copied += len;
+
+		// Increment offsets
+		in += pkt.length;
+		out += len;
+
+		// Extract first error
+		if (pkt.status == 0 || *status != 0) {
+			continue;
+		}
+		*status = pkt.status;
+	}
+	return copied;
+}

vendor/github.com/karalabe/gousb/usb/iso.go

@@ -0,0 +1,148 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+/*
+#include "libusb.h"
+
+int submit(struct libusb_transfer *xfer);
+void print_xfer(struct libusb_transfer *xfer);
+int extract_data(struct libusb_transfer *xfer, void *data, int max, unsigned char *status);
+*/
+import "C"
+
+import (
+	"fmt"
+	"log"
+	"time"
+	"unsafe"
+)
+
+//export iso_callback
+func iso_callback(cptr unsafe.Pointer) {
+	ch := *(*chan struct{})(cptr)
+	close(ch)
+}
+
+func (end *endpoint) allocTransfer() *Transfer {
+	// Use libusb_get_max_iso_packet_size ?
+	const (
+		iso_packets = 8       // 128 // 242
+		packet_size = 2 * 960 // 1760
+	)
+
+	xfer := C.libusb_alloc_transfer(C.int(iso_packets))
+	if xfer == nil {
+		log.Printf("usb: transfer allocation failed?!")
+		return nil
+	}
+
+	buf := make([]byte, iso_packets*packet_size)
+	done := make(chan struct{}, 1)
+
+	xfer.dev_handle = end.Device.handle
+	xfer.endpoint = C.uchar(end.Address)
+	xfer._type = C.LIBUSB_TRANSFER_TYPE_ISOCHRONOUS
+
+	xfer.buffer = (*C.uchar)((unsafe.Pointer)(&buf[0]))
+	xfer.length = C.int(len(buf))
+	xfer.num_iso_packets = iso_packets
+
+	C.libusb_set_iso_packet_lengths(xfer, packet_size)
+	/*
+		pkts := *(*[]C.struct_libusb_packet_descriptor)(unsafe.Pointer(&reflect.SliceHeader{
+			Data: uintptr(unsafe.Pointer(&xfer.iso_packet_desc)),
+			Len:  iso_packets,
+			Cap:  iso_packets,
+		}))
+	*/
+
+	t := &Transfer{
+		xfer: xfer,
+		done: done,
+		buf:  buf,
+	}
+	xfer.user_data = (unsafe.Pointer)(&t.done)
+
+	return t
+}
+
+type Transfer struct {
+	xfer *C.struct_libusb_transfer
+	pkts []*C.struct_libusb_packet_descriptor
+	done chan struct{}
+	buf  []byte
+}
+
+func (t *Transfer) Submit(timeout time.Duration) error {
+	//log.Printf("iso: submitting %#v", t.xfer)
+	t.xfer.timeout = C.uint(timeout / time.Millisecond)
+	if errno := C.submit(t.xfer); errno < 0 {
+		return usbError(errno)
+	}
+	return nil
+}
+
+func (t *Transfer) Wait(b []byte) (n int, err error) {
+	select {
+	case <-time.After(10 * time.Second):
+		return 0, fmt.Errorf("wait timed out after 10s")
+	case <-t.done:
+	}
+	// Non-iso transfers:
+	//n = int(t.xfer.actual_length)
+	//copy(b, ((*[1 << 16]byte)(unsafe.Pointer(t.xfer.buffer)))[:n])
+
+	//C.print_xfer(t.xfer)
+	/*
+		buf, offset := ((*[1 << 16]byte)(unsafe.Pointer(t.xfer.buffer))), 0
+		for i, pkt := range *t.pkts {
+			log.Printf("Type is %T", t.pkts)
+			n += copy(b[n:], buf[offset:][:pkt.actual_length])
+			offset += pkt.Length
+			if pkt.status != 0 && err == nil {
+				err = error(TransferStatus(pkt.status))
+			}
+		}
+	*/
+	var status uint8
+	n = int(C.extract_data(t.xfer, unsafe.Pointer(&b[0]), C.int(len(b)), (*C.uchar)(unsafe.Pointer(&status))))
+	if status != 0 {
+		err = TransferStatus(status)
+	}
+	return n, err
+}
+
+func (t *Transfer) Close() error {
+	C.libusb_free_transfer(t.xfer)
+	return nil
+}
+
+func isochronous_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
+	t := e.allocTransfer()
+	defer t.Close()
+
+	if err := t.Submit(timeout); err != nil {
+		log.Printf("iso: xfer failed to submit: %s", err)
+		return 0, err
+	}
+
+	n, err := t.Wait(buf)
+	if err != nil {
+		log.Printf("iso: xfer failed: %s", err)
+		return 0, err
+	}
+	return n, err
+}

vendor/github.com/karalabe/gousb/usb/misc.go

@@ -0,0 +1,47 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usb
+
+import (
+	"fmt"
+)
+
+type BCD uint16
+
+const (
+	USB_2_0 BCD = 0x0200
+	USB_1_1 BCD = 0x0110
+	USB_1_0 BCD = 0x0100
+)
+
+func (d BCD) Int() (i int) {
+	ten := 1
+	for o := uint(0); o < 4; o++ {
+		n := ((0xF << (o * 4)) & d) >> (o * 4)
+		i += int(n) * ten
+		ten *= 10
+	}
+	return
+}
+
+func (d BCD) String() string {
+	return fmt.Sprintf("%02x.%02x", int(d>>8), int(d&0xFF))
+}
+
+type ID uint16
+
+func (id ID) String() string {
+	return fmt.Sprintf("%04x", int(id))
+}

vendor/github.com/karalabe/gousb/usb/usb.go

@@ -0,0 +1,178 @@
+// Copyright 2013 Google Inc.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package usb provides a wrapper around libusb-1.0.
+package usb
+
+/*
+#cgo CFLAGS: -I../internal/libusb/libusb
+#cgo CFLAGS: -DDEFAULT_VISIBILITY=""
+#cgo linux CFLAGS: -DOS_LINUX -D_GNU_SOURCE -DPOLL_NFDS_TYPE=int
+#cgo darwin CFLAGS: -DOS_DARWIN -DPOLL_NFDS_TYPE=int
+#cgo darwin LDFLAGS: -framework CoreFoundation -framework IOKit -lobjc
+#cgo openbsd CFLAGS: -DOS_OPENBSD -DPOLL_NFDS_TYPE=int
+#cgo windows CFLAGS: -DOS_WINDOWS -DUSE_USBDK -DPOLL_NFDS_TYPE=int
+
+#if defined(OS_LINUX) || defined(OS_DARWIN) || defined(OS_OPENBSD)
+	#include <sys/poll.h>
+	#include "os/threads_posix.c"
+	#include "os/poll_posix.c"
+#elif defined(OS_WINDOWS)
+	#include "os/threads_windows.c"
+	#include "os/poll_windows.c"
+#endif
+
+#ifdef OS_LINUX
+	#include "os/linux_usbfs.c"
+	#include "os/linux_netlink.c"
+#elif OS_DARWIN
+	#include "os/darwin_usb.c"
+#elif OS_OPENBSD
+	#include "os/openbsd_usb.c"
+#elif OS_WINDOWS
+	#include "os/windows_nt_common.c"
+	#include "os/windows_usbdk.c"
+#endif
+
+#include "core.c"
+#include "descriptor.c"
+#include "hotplug.c"
+#include "io.c"
+#include "strerror.c"
+#include "sync.c"
+*/
+import "C"
+
+import (
+	"log"
+	"reflect"
+	"unsafe"
+)
+
+type Context struct {
+	ctx  *C.libusb_context
+	done chan struct{}
+}
+
+func (c *Context) Debug(level int) {
+	C.libusb_set_debug(c.ctx, C.int(level))
+}
+
+func NewContext() (*Context, error) {
+	c := &Context{
+		done: make(chan struct{}),
+	}
+
+	if errno := C.libusb_init(&c.ctx); errno != 0 {
+		return nil, usbError(errno)
+	}
+
+	go func() {
+		tv := C.struct_timeval{
+			tv_sec:  0,
+			tv_usec: 100000,
+		}
+		for {
+			select {
+			case <-c.done:
+				return
+			default:
+			}
+			if errno := C.libusb_handle_events_timeout_completed(c.ctx, &tv, nil); errno < 0 {
+				log.Printf("handle_events: error: %s", usbError(errno))
+				continue
+			}
+			//log.Printf("handle_events returned")
+		}
+	}()
+
+	return c, nil
+}
+
+// ListDevices calls each with each enumerated device.
+// If the function returns true, the device is opened and a Device is returned if the operation succeeds.
+// Every Device returned (whether an error is also returned or not) must be closed.
+// If there are any errors enumerating the devices,
+// the final one is returned along with any successfully opened devices.
+func (c *Context) ListDevices(each func(desc *Descriptor) bool) ([]*Device, error) {
+	var list **C.libusb_device
+	cnt := C.libusb_get_device_list(c.ctx, &list)
+	if cnt < 0 {
+		return nil, usbError(cnt)
+	}
+	defer C.libusb_free_device_list(list, 1)
+
+	var slice []*C.libusb_device
+	*(*reflect.SliceHeader)(unsafe.Pointer(&slice)) = reflect.SliceHeader{
+		Data: uintptr(unsafe.Pointer(list)),
+		Len:  int(cnt),
+		Cap:  int(cnt),
+	}
+
+	var reterr error
+	var ret []*Device
+	for _, dev := range slice {
+		desc, err := newDescriptor(dev)
+		if err != nil {
+			reterr = err
+			continue
+		}
+
+		if each(desc) {
+			var handle *C.libusb_device_handle
+			if errno := C.libusb_open(dev, &handle); errno != 0 {
+				reterr = usbError(errno)
+				continue
+			}
+			if dev, err := newDevice(handle, desc); err != nil {
+				reterr = err
+			} else {
+				ret = append(ret, dev)
+			}
+		}
+	}
+	return ret, reterr
+}
+
+// OpenDeviceWithVidPid opens Device from specific VendorId and ProductId.
+// If there are any errors, it'll returns at second value.
+func (c *Context) OpenDeviceWithVidPid(vid, pid int) (*Device, error) {
+
+	handle := C.libusb_open_device_with_vid_pid(c.ctx, (C.uint16_t)(vid), (C.uint16_t)(pid))
+	if handle == nil {
+		return nil, ERROR_NOT_FOUND
+	}
+
+	dev := C.libusb_get_device(handle)
+	if dev == nil {
+		return nil, ERROR_NO_DEVICE
+	}
+
+	desc, err := newDescriptor(dev)
+
+	// return an error from nil-handle and nil-device
+	if err != nil {
+		return nil, err
+	}
+	return newDevice(handle, desc)
+}
+
+func (c *Context) Close() error {
+	close(c.done)
+	if c.ctx != nil {
+		C.libusb_exit(c.ctx)
+	}
+	c.ctx = nil
+	return nil
+}