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