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 24static 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 52int 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