1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
|
// 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.
// rawread attempts to read from the specified USB device.
package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"strconv"
"strings"
"github.com/google/gousb"
)
var (
vidPID = flag.String("vidpid", "", "VID:PID of the device to which to connect. Exclusive with busaddr flag.")
busAddr = flag.String("busaddr", "", "Bus:address of the device to which to connect. Exclusive with vidpid flag.")
config = flag.Int("config", 1, "Configuration number to use with the device.")
iface = flag.Int("interface", 0, "Interface to use on the device.")
alternate = flag.Int("alternate", 0, "Alternate setting to use on the interface.")
endpoint = flag.Int("endpoint", 1, "Endpoint number to which to connect (without the leading 0x8).")
debug = flag.Int("debug", 3, "Debug level for libusb.")
size = flag.Int("read_size", 1024, "Number of bytes of data to read in a single transaction.")
bufSize = flag.Int("buffer_size", 0, "Number of buffer transfers, for data prefetching.")
num = flag.Int("read_num", 0, "Number of read transactions to perform. 0 means infinite.")
timeout = flag.Duration("timeout", 0, "Timeout for the command. 0 means infinite.")
)
func parseVIDPID(vidPid string) (gousb.ID, gousb.ID, error) {
s := strings.Split(vidPid, ":")
if len(s) != 2 {
return 0, 0, fmt.Errorf("want VID:PID, two 32-bit hex numbers separated by colon, e.g. 1d6b:0002")
}
vid, err := strconv.ParseUint(s[0], 16, 32)
if err != nil {
return 0, 0, fmt.Errorf("VID must be a hexadecimal 32-bit number, e.g. 1d6b")
}
pid, err := strconv.ParseUint(s[1], 16, 32)
if err != nil {
return 0, 0, fmt.Errorf("PID must be a hexadecimal 32-bit number, e.g. 1d6b")
}
return gousb.ID(vid), gousb.ID(pid), nil
}
func parseBusAddr(busAddr string) (int, int, error) {
s := strings.Split(busAddr, ":")
if len(s) != 2 {
return 0, 0, fmt.Errorf("want bus:addr, two 8-bit decimal unsigned integers separated by colon, e.g. 1:1")
}
bus, err := strconv.ParseUint(s[0], 10, 8)
if err != nil {
return 0, 0, fmt.Errorf("bus number must be an 8-bit decimal unsigned integer")
}
addr, err := strconv.ParseUint(s[1], 10, 8)
if err != nil {
return 0, 0, fmt.Errorf("device address must be an 8-bit decimal unsigned integer")
}
return int(bus), int(addr), nil
}
type contextReader interface {
ReadContext(context.Context, []byte) (int, error)
}
func main() {
flag.Parse()
// Only one context should be needed for an application. It should always be closed.
ctx := gousb.NewContext()
defer ctx.Close()
ctx.Debug(*debug)
var devName string
var vid, pid gousb.ID
var bus, addr int
switch {
case *vidPID == "" && *busAddr == "":
log.Fatal("You need to specify the device through a --vidpid flag or through a --busaddr flag.")
case *vidPID != "" && *busAddr != "":
log.Fatal("You can't use --vidpid flag together with --busaddr. Pick one.")
case *vidPID != "":
var err error
vid, pid, err = parseVIDPID(*vidPID)
if err != nil {
log.Fatalf("Invalid value for --vidpid (%q): %v", *vidPID, err)
}
devName = fmt.Sprintf("VID:PID %s:%s", vid, pid)
default:
var err error
bus, addr, err = parseBusAddr(*busAddr)
if err != nil {
log.Fatalf("Invalid value for --busaddr (%q): %v", *busAddr, err)
}
devName = fmt.Sprintf("bus:addr %d:%d", bus, addr)
}
log.Printf("Scanning for device %q...", devName)
// OpenDevices is used to find the devices to open.
devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
switch {
case vid == desc.Vendor && pid == desc.Product:
return true
case bus == desc.Bus && addr == desc.Address:
return true
}
return false
})
// All Devices returned from OpenDevices must be closed.
defer func() {
for _, d := range devs {
d.Close()
}
}()
// OpenDevices can occasionally fail, so be sure to check its return value.
if err != nil {
log.Printf("Warning: OpenDevices: %s.", err)
}
switch {
case len(devs) == 0:
log.Fatal("No matching devices found.")
case len(devs) > 1:
log.Printf("Warning: multiple devices found. Using bus %d, addr %d.", devs[0].Desc.Bus, devs[0].Desc.Address)
for _, d := range devs[1:] {
d.Close()
}
devs = devs[:1]
}
dev := devs[0]
log.Print("Enabling autodetach")
dev.SetAutoDetach(true)
log.Printf("Setting configuration %d...", *config)
cfg, err := dev.Config(*config)
if err != nil {
log.Fatalf("dev.Config(%d): %v", *config, err)
}
log.Printf("Claiming interface %d (alt setting %d)...", *iface, *alternate)
intf, err := cfg.Interface(*iface, *alternate)
if err != nil {
log.Fatalf("cfg.Interface(%d, %d): %v", *iface, *alternate, err)
}
log.Printf("Using endpoint %d...", *endpoint)
ep, err := intf.InEndpoint(*endpoint)
if err != nil {
log.Fatalf("dev.InEndpoint(): %s", err)
}
log.Printf("Found endpoint: %s", ep)
var rdr contextReader = ep
if *bufSize > 1 {
log.Print("Creating buffer...")
s, err := ep.NewStream(*size, *bufSize)
if err != nil {
log.Fatalf("ep.NewStream(): %v", err)
}
defer s.Close()
rdr = s
}
opCtx := context.Background()
if *timeout > 0 {
var done func()
opCtx, done = context.WithTimeout(opCtx, *timeout)
defer done()
}
buf := make([]byte, *size)
log.Print("Reading...")
for i := 0; *num == 0 || i < *num; i++ {
num, err := rdr.ReadContext(opCtx, buf)
if err != nil {
log.Fatalf("Reading from device failed: %v", err)
}
os.Stdout.Write(buf[:num])
}
}
|