1 /*
2 * libusb example program to list devices on the bus
3 * Copyright © 2007 Daniel Drake <dsd@gentoo.org>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 #include <stdio.h>
21
22 #include "libusb.h"
23
print_devs(libusb_device ** devs)24 static void print_devs(libusb_device **devs)
25 {
26 libusb_device *dev;
27 int i = 0, j = 0;
28 uint8_t path[8];
29
30 while ((dev = devs[i++]) != NULL) {
31 struct libusb_device_descriptor desc;
32 int r = libusb_get_device_descriptor(dev, &desc);
33 if (r < 0) {
34 fprintf(stderr, "failed to get device descriptor");
35 return;
36 }
37
38 printf("%04x:%04x (bus %d, device %d)",
39 desc.idVendor, desc.idProduct,
40 libusb_get_bus_number(dev), libusb_get_device_address(dev));
41
42 r = libusb_get_port_numbers(dev, path, sizeof(path));
43 if (r > 0) {
44 printf(" path: %d", path[0]);
45 for (j = 1; j < r; j++)
46 printf(".%d", path[j]);
47 }
48 printf("\n");
49 }
50 }
51
main(void)52 int main(void)
53 {
54 libusb_device **devs;
55 int r;
56 ssize_t cnt;
57
58 r = libusb_init(NULL);
59 if (r < 0)
60 return r;
61
62 cnt = libusb_get_device_list(NULL, &devs);
63 if (cnt < 0)
64 return (int) cnt;
65
66 print_devs(devs);
67 libusb_free_device_list(devs, 1);
68
69 libusb_exit(NULL);
70 return 0;
71 }
72