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/*
* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <errno.h>
#include <getopt.h>
#include <libusb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Options */
static uint16_t vid = 0x18d1; /* Google */
static uint16_t pid = 0x5014; /* Cr50 */
static char *progname;
static void usage(int errs)
{
printf("\nUsage: %s [vid:pid] [value]\n"
"\n"
"Set/Get the USB Device Configuration value\n"
"\n"
"The default vid:pid is %04x:%04x\n"
"\n",
progname, vid, pid);
exit(!!errs);
}
/* Globals */
struct libusb_device_handle *devh = 0;
static void stupid_usb(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
if (devh)
libusb_close(devh);
libusb_exit(NULL);
exit(1);
}
int main(int argc, char *argv[])
{
int r = 1;
int errorcnt = 0;
int do_set = 0;
uint16_t setval = 0;
uint8_t buf[80]; /* Arbitrary size */
int i;
progname = strrchr(argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
opterr = 0; /* quiet, you */
while ((i = getopt(argc, argv, "")) != -1) {
switch (i) {
case 'h':
usage(errorcnt);
break;
case 0: /* auto-handled option */
break;
case '?':
if (optopt)
printf("Unrecognized option: -%c\n", optopt);
else
printf("Unrecognized option: %s\n",
argv[optind - 1]);
errorcnt++;
break;
case ':':
printf("Missing argument to %s\n", argv[optind - 1]);
errorcnt++;
break;
default:
printf("Internal error at %s:%d\n", __FILE__, __LINE__);
exit(1);
}
}
if (errorcnt)
usage(errorcnt);
if (optind < argc) {
uint16_t v, p;
if (2 == sscanf(argv[optind], "%hx:%hx", &v, &p)) {
vid = v;
pid = p;
optind++;
}
}
if (optind < argc) {
do_set = 1;
setval = atoi(argv[optind]);
}
r = libusb_init(NULL);
if (r) {
printf("libusb_init() returned 0x%x: %s\n", r,
libusb_error_name(r));
return 1;
}
devh = libusb_open_device_with_vid_pid(NULL, vid, pid);
if (!devh) {
perror(progname);
stupid_usb("Can't open device %04x:%04x\n", vid, pid);
}
/* Set config*/
if (do_set) {
printf("SetCfg %d\n", setval);
r = libusb_control_transfer(devh, 0x00, /* bmRequestType */
0x09, /* bRequest */
setval, /* wValue */
0x0000, /* wIndex */
NULL, /* data */
0x0000, /* wLength */
1000); /* timeout (ms) */
if (r < 0)
printf("transfer returned 0x%x %s\n", r,
libusb_error_name(r));
}
/* Get config */
memset(buf, 0, sizeof(buf));
r = libusb_control_transfer(devh, 0x80, /* bmRequestType */
0x08, /* bRequest */
0x0000, /* wValue */
0x0000, /* wIndex */
buf, /* data */
0x0001, /* wLength */
1000); /* timeout (ms) */
if (r <= 0)
stupid_usb("GetCfg transfer() returned 0x%x %s\n", r,
libusb_error_name(r));
printf("GetCfg returned %d bytes:", r);
for (i = 0; i < r; i++)
printf(" 0x%02x", buf[i]);
printf("\n");
/* done */
if (devh)
libusb_close(devh);
libusb_exit(NULL);
return 0;
}
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