83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright 2013 Google Inc. All rights reserved.
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// Copyright 2016 the gousb Authors. 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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import (
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"fmt"
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"time"
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)
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type Endpoint struct {
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h *libusbDevHandle
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InterfaceSetup
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EndpointInfo
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readTimeout time.Duration
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writeTimeout time.Duration
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}
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func (e *Endpoint) Read(buf []byte) (int, error) {
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if EndpointDirection(e.Address)&EndpointDirectionMask != EndpointDirectionIn {
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return 0, fmt.Errorf("usb: read: not an IN endpoint")
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}
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return e.transfer(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)&EndpointDirectionMask != EndpointDirectionOut {
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return 0, fmt.Errorf("usb: write: not an OUT endpoint")
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}
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return e.transfer(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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func (e *Endpoint) transfer(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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t, err := newUSBTransfer(e.h, e.EndpointInfo, buf, timeout)
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if err != nil {
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return 0, err
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}
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defer t.free()
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if err := t.submit(); err != nil {
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return 0, err
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}
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n, err := t.wait()
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if err != nil {
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return n, err
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}
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return n, nil
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}
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func newEndpoint(h *libusbDevHandle, s InterfaceSetup, e EndpointInfo, rt, wt time.Duration) *Endpoint {
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return &Endpoint{
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InterfaceSetup: s,
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EndpointInfo: e,
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h: h,
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readTimeout: rt,
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writeTimeout: wt,
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}
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}
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