1 /* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
2 /*
3 * libusb example program for hotplug API
4 * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdlib.h>
22 #include <stdio.h>
23
24 #include "libusb.h"
25
26 int done = 0;
27 libusb_device_handle *handle = NULL;
28
hotplug_callback(libusb_context * ctx,libusb_device * dev,libusb_hotplug_event event,void * user_data)29 static int LIBUSB_CALL hotplug_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
30 {
31 struct libusb_device_descriptor desc;
32 int rc;
33
34 (void)ctx;
35 (void)dev;
36 (void)event;
37 (void)user_data;
38
39 rc = libusb_get_device_descriptor(dev, &desc);
40 if (LIBUSB_SUCCESS != rc) {
41 fprintf (stderr, "Error getting device descriptor\n");
42 }
43
44 printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
45
46 if (handle) {
47 libusb_close (handle);
48 handle = NULL;
49 }
50
51 rc = libusb_open (dev, &handle);
52 if (LIBUSB_SUCCESS != rc) {
53 fprintf (stderr, "Error opening device\n");
54 }
55
56 done++;
57
58 return 0;
59 }
60
hotplug_callback_detach(libusb_context * ctx,libusb_device * dev,libusb_hotplug_event event,void * user_data)61 static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
62 {
63 (void)ctx;
64 (void)dev;
65 (void)event;
66 (void)user_data;
67
68 printf ("Device detached\n");
69
70 if (handle) {
71 libusb_close (handle);
72 handle = NULL;
73 }
74
75 done++;
76
77 return 0;
78 }
79
main(int argc,char * argv[])80 int main(int argc, char *argv[])
81 {
82 libusb_hotplug_callback_handle hp[2];
83 int product_id, vendor_id, class_id;
84 int rc;
85
86 vendor_id = (argc > 1) ? (int)strtol (argv[1], NULL, 0) : 0x045a;
87 product_id = (argc > 2) ? (int)strtol (argv[2], NULL, 0) : 0x5005;
88 class_id = (argc > 3) ? (int)strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
89
90 rc = libusb_init (NULL);
91 if (rc < 0)
92 {
93 printf("failed to initialise libusb: %s\n", libusb_error_name(rc));
94 return EXIT_FAILURE;
95 }
96
97 if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
98 printf ("Hotplug capabilities are not supported on this platform\n");
99 libusb_exit (NULL);
100 return EXIT_FAILURE;
101 }
102
103 rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
104 product_id, class_id, hotplug_callback, NULL, &hp[0]);
105 if (LIBUSB_SUCCESS != rc) {
106 fprintf (stderr, "Error registering callback 0\n");
107 libusb_exit (NULL);
108 return EXIT_FAILURE;
109 }
110
111 rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
112 product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
113 if (LIBUSB_SUCCESS != rc) {
114 fprintf (stderr, "Error registering callback 1\n");
115 libusb_exit (NULL);
116 return EXIT_FAILURE;
117 }
118
119 while (done < 2) {
120 rc = libusb_handle_events (NULL);
121 if (rc < 0)
122 printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
123 }
124
125 if (handle) {
126 libusb_close (handle);
127 }
128
129 libusb_exit (NULL);
130
131 return EXIT_SUCCESS;
132 }
133