mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100 lines
2.4 KiB
100 lines
2.4 KiB
// Copyright 2013 Google Inc. 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.h"
|
|
import "C"
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"time"
|
|
"unsafe"
|
|
)
|
|
|
|
type Endpoint interface {
|
|
Read(b []byte) (int, error)
|
|
Write(b []byte) (int, error)
|
|
Interface() InterfaceSetup
|
|
Info() EndpointInfo
|
|
}
|
|
|
|
type endpoint struct {
|
|
*Device
|
|
InterfaceSetup
|
|
EndpointInfo
|
|
xfer func(*endpoint, []byte, time.Duration) (int, error)
|
|
}
|
|
|
|
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.xfer(e, 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.xfer(e, buf, e.WriteTimeout)
|
|
}
|
|
|
|
func (e *endpoint) Interface() InterfaceSetup { return e.InterfaceSetup }
|
|
func (e *endpoint) Info() EndpointInfo { return e.EndpointInfo }
|
|
|
|
// TODO(kevlar): (*Endpoint).Close
|
|
|
|
func bulk_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
|
|
if len(buf) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
data := (*reflect.SliceHeader)(unsafe.Pointer(&buf)).Data
|
|
|
|
var cnt C.int
|
|
if errno := C.libusb_bulk_transfer(
|
|
e.handle,
|
|
C.uchar(e.Address),
|
|
(*C.uchar)(unsafe.Pointer(data)),
|
|
C.int(len(buf)),
|
|
&cnt,
|
|
C.uint(timeout/time.Millisecond)); errno < 0 {
|
|
return 0, usbError(errno)
|
|
}
|
|
return int(cnt), nil
|
|
}
|
|
|
|
func interrupt_xfer(e *endpoint, buf []byte, timeout time.Duration) (int, error) {
|
|
if len(buf) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
data := (*reflect.SliceHeader)(unsafe.Pointer(&buf)).Data
|
|
|
|
var cnt C.int
|
|
if errno := C.libusb_interrupt_transfer(
|
|
e.handle,
|
|
C.uchar(e.Address),
|
|
(*C.uchar)(unsafe.Pointer(data)),
|
|
C.int(len(buf)),
|
|
&cnt,
|
|
C.uint(timeout/time.Millisecond)); errno < 0 {
|
|
return 0, usbError(errno)
|
|
}
|
|
return int(cnt), nil
|
|
}
|
|
|