xref: /aosp_15_r20/external/libusb/examples/listdevs.c (revision 86b64dcb59b3a0b37502ecd56e119234366a6f7e)
1*86b64dcbSAndroid Build Coastguard Worker /*
2*86b64dcbSAndroid Build Coastguard Worker  * libusb example program to list devices on the bus
3*86b64dcbSAndroid Build Coastguard Worker  * Copyright © 2007 Daniel Drake <[email protected]>
4*86b64dcbSAndroid Build Coastguard Worker  *
5*86b64dcbSAndroid Build Coastguard Worker  * This library is free software; you can redistribute it and/or
6*86b64dcbSAndroid Build Coastguard Worker  * modify it under the terms of the GNU Lesser General Public
7*86b64dcbSAndroid Build Coastguard Worker  * License as published by the Free Software Foundation; either
8*86b64dcbSAndroid Build Coastguard Worker  * version 2.1 of the License, or (at your option) any later version.
9*86b64dcbSAndroid Build Coastguard Worker  *
10*86b64dcbSAndroid Build Coastguard Worker  * This library is distributed in the hope that it will be useful,
11*86b64dcbSAndroid Build Coastguard Worker  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12*86b64dcbSAndroid Build Coastguard Worker  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13*86b64dcbSAndroid Build Coastguard Worker  * Lesser General Public License for more details.
14*86b64dcbSAndroid Build Coastguard Worker  *
15*86b64dcbSAndroid Build Coastguard Worker  * You should have received a copy of the GNU Lesser General Public
16*86b64dcbSAndroid Build Coastguard Worker  * License along with this library; if not, write to the Free Software
17*86b64dcbSAndroid Build Coastguard Worker  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*86b64dcbSAndroid Build Coastguard Worker  */
19*86b64dcbSAndroid Build Coastguard Worker 
20*86b64dcbSAndroid Build Coastguard Worker #include <stdio.h>
21*86b64dcbSAndroid Build Coastguard Worker 
22*86b64dcbSAndroid Build Coastguard Worker #include "libusb.h"
23*86b64dcbSAndroid Build Coastguard Worker 
print_devs(libusb_device ** devs)24*86b64dcbSAndroid Build Coastguard Worker static void print_devs(libusb_device **devs)
25*86b64dcbSAndroid Build Coastguard Worker {
26*86b64dcbSAndroid Build Coastguard Worker 	libusb_device *dev;
27*86b64dcbSAndroid Build Coastguard Worker 	int i = 0, j = 0;
28*86b64dcbSAndroid Build Coastguard Worker 	uint8_t path[8];
29*86b64dcbSAndroid Build Coastguard Worker 
30*86b64dcbSAndroid Build Coastguard Worker 	while ((dev = devs[i++]) != NULL) {
31*86b64dcbSAndroid Build Coastguard Worker 		struct libusb_device_descriptor desc;
32*86b64dcbSAndroid Build Coastguard Worker 		int r = libusb_get_device_descriptor(dev, &desc);
33*86b64dcbSAndroid Build Coastguard Worker 		if (r < 0) {
34*86b64dcbSAndroid Build Coastguard Worker 			fprintf(stderr, "failed to get device descriptor");
35*86b64dcbSAndroid Build Coastguard Worker 			return;
36*86b64dcbSAndroid Build Coastguard Worker 		}
37*86b64dcbSAndroid Build Coastguard Worker 
38*86b64dcbSAndroid Build Coastguard Worker 		printf("%04x:%04x (bus %d, device %d)",
39*86b64dcbSAndroid Build Coastguard Worker 			desc.idVendor, desc.idProduct,
40*86b64dcbSAndroid Build Coastguard Worker 			libusb_get_bus_number(dev), libusb_get_device_address(dev));
41*86b64dcbSAndroid Build Coastguard Worker 
42*86b64dcbSAndroid Build Coastguard Worker 		r = libusb_get_port_numbers(dev, path, sizeof(path));
43*86b64dcbSAndroid Build Coastguard Worker 		if (r > 0) {
44*86b64dcbSAndroid Build Coastguard Worker 			printf(" path: %d", path[0]);
45*86b64dcbSAndroid Build Coastguard Worker 			for (j = 1; j < r; j++)
46*86b64dcbSAndroid Build Coastguard Worker 				printf(".%d", path[j]);
47*86b64dcbSAndroid Build Coastguard Worker 		}
48*86b64dcbSAndroid Build Coastguard Worker 		printf("\n");
49*86b64dcbSAndroid Build Coastguard Worker 	}
50*86b64dcbSAndroid Build Coastguard Worker }
51*86b64dcbSAndroid Build Coastguard Worker 
main(void)52*86b64dcbSAndroid Build Coastguard Worker int main(void)
53*86b64dcbSAndroid Build Coastguard Worker {
54*86b64dcbSAndroid Build Coastguard Worker 	libusb_device **devs;
55*86b64dcbSAndroid Build Coastguard Worker 	int r;
56*86b64dcbSAndroid Build Coastguard Worker 	ssize_t cnt;
57*86b64dcbSAndroid Build Coastguard Worker 
58*86b64dcbSAndroid Build Coastguard Worker 	r = libusb_init_context(/*ctx=*/NULL, /*options=*/NULL, /*num_options=*/0);
59*86b64dcbSAndroid Build Coastguard Worker 	if (r < 0)
60*86b64dcbSAndroid Build Coastguard Worker 		return r;
61*86b64dcbSAndroid Build Coastguard Worker 
62*86b64dcbSAndroid Build Coastguard Worker 	cnt = libusb_get_device_list(NULL, &devs);
63*86b64dcbSAndroid Build Coastguard Worker 	if (cnt < 0){
64*86b64dcbSAndroid Build Coastguard Worker 		libusb_exit(NULL);
65*86b64dcbSAndroid Build Coastguard Worker 		return (int) cnt;
66*86b64dcbSAndroid Build Coastguard Worker 	}
67*86b64dcbSAndroid Build Coastguard Worker 
68*86b64dcbSAndroid Build Coastguard Worker 	print_devs(devs);
69*86b64dcbSAndroid Build Coastguard Worker 	libusb_free_device_list(devs, 1);
70*86b64dcbSAndroid Build Coastguard Worker 
71*86b64dcbSAndroid Build Coastguard Worker 	libusb_exit(NULL);
72*86b64dcbSAndroid Build Coastguard Worker 	return 0;
73*86b64dcbSAndroid Build Coastguard Worker }
74