e0f30623b3
descriptor values. E.g. for the user, the distinction between MaxIsoPkt and MaxPktSize is irrelevant, only the calculated max packet size matters.
80 lines
1.8 KiB
Go
80 lines
1.8 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
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
)
|
|
|
|
type Endpoint struct {
|
|
h *libusbDevHandle
|
|
|
|
InterfaceSetup
|
|
Info EndpointInfo
|
|
|
|
readTimeout time.Duration
|
|
writeTimeout time.Duration
|
|
}
|
|
|
|
func (e *Endpoint) Read(buf []byte) (int, error) {
|
|
if e.Info.Direction != EndpointDirectionIn {
|
|
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 e.Info.Direction != EndpointDirectionOut {
|
|
return 0, fmt.Errorf("usb: write: not an OUT endpoint")
|
|
}
|
|
|
|
return e.transfer(buf, e.writeTimeout)
|
|
}
|
|
|
|
func (e *Endpoint) transfer(buf []byte, timeout time.Duration) (int, error) {
|
|
if len(buf) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
t, err := newUSBTransfer(e.h, &e.Info, buf, timeout)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer t.free()
|
|
|
|
if err := t.submit(); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
n, err := t.wait()
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
func newEndpoint(h *libusbDevHandle, s InterfaceSetup, e EndpointInfo, rt, wt time.Duration) *Endpoint {
|
|
return &Endpoint{
|
|
InterfaceSetup: s,
|
|
Info: e,
|
|
h: h,
|
|
readTimeout: rt,
|
|
writeTimeout: wt,
|
|
}
|
|
}
|