1 /* 2 * libusb example program to list devices on the bus 3 * Copyright (C) 2007 Daniel Drake <dsd (at) 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 #include <sys/types.h> 22 23 #include <libusb/libusb.h> 24 25 static void print_devs(libusb_device **devs) 26 { 27 libusb_device *dev; 28 int i = 0; 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)\n", 39 desc.idVendor, desc.idProduct, 40 libusb_get_bus_number(dev), libusb_get_device_address(dev)); 41 } 42 } 43 44 int main(void) 45 { 46 libusb_device **devs; 47 int r; 48 ssize_t cnt; 49 50 r = libusb_init(NULL); 51 if (r < 0) 52 return r; 53 54 cnt = libusb_get_device_list(NULL, &devs); 55 if (cnt < 0) 56 return (int) cnt; 57 58 print_devs(devs); 59 libusb_free_device_list(devs, 1); 60 61 libusb_exit(NULL); 62 return 0; 63 } 64 65
