102 lines
2.4 KiB
Go
102 lines
2.4 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 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 transferIntf interface {
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submit() error
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wait() (int, error)
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free() error
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}
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type endpoint struct {
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h *deviceHandle
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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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newUSBTransfer func([]byte, time.Duration) (transferIntf, 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.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)&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.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) newLibUSBTransfer(buf []byte, timeout time.Duration) (transferIntf, error) {
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return newUSBTransfer(e.h, e.EndpointInfo, buf, timeout)
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}
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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 := e.newUSBTransfer(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(d *Device) *endpoint {
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ep := &endpoint{
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h: (*deviceHandle)(d.handle),
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readTimeout: d.ReadTimeout,
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writeTimeout: d.WriteTimeout,
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}
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ep.newUSBTransfer = ep.newLibUSBTransfer
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return ep
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}
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