83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright 2013 Google Inc. All rights reserved.
|
|
// Copyright 2016 the gousb Authors. 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-1.0/libusb.h>
|
|
import "C"
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"time"
|
|
)
|
|
|
|
type Endpoint interface {
|
|
Read(b []byte) (int, error)
|
|
Write(b []byte) (int, error)
|
|
Interface() InterfaceSetup
|
|
Info() EndpointInfo
|
|
}
|
|
|
|
type endpoint struct {
|
|
*Device
|
|
InterfaceSetup
|
|
EndpointInfo
|
|
}
|
|
|
|
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.transfer(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.transfer(buf, e.WriteTimeout)
|
|
}
|
|
|
|
func (e *endpoint) Interface() InterfaceSetup { return e.InterfaceSetup }
|
|
func (e *endpoint) Info() EndpointInfo { return e.EndpointInfo }
|
|
|
|
func (e *endpoint) transfer(buf []byte, timeout time.Duration) (int, error) {
|
|
if len(buf) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
tt := e.TransferType()
|
|
t, err := newUSBTransfer(e.EndpointInfo, buf, timeout)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer t.free()
|
|
|
|
if err := t.submit(); err != nil {
|
|
log.Printf("bulk: %s failed to submit: %s", tt, err)
|
|
return 0, err
|
|
}
|
|
|
|
n, err := t.wait()
|
|
if err != nil {
|
|
log.Printf("bulk: %s failed: %s", tt, err)
|
|
return 0, err
|
|
}
|
|
return n, err
|
|
}
|