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 rc = libusb_get_device_descriptor(dev, &desc);
35 if (LIBUSB_SUCCESS != rc) {
36 fprintf (stderr, "Error getting device descriptor\n");
37 }
38
39 printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
40
41 if (handle) {
42 libusb_close (handle);
43 handle = NULL;
44 }
45
46 rc = libusb_open (dev, &handle);
47 if (LIBUSB_SUCCESS != rc) {
48 fprintf (stderr, "Error opening device\n");
49 }
50
51 done++;
52
53 return 0;
54 }
55
hotplug_callback_detach(libusb_context * ctx,libusb_device * dev,libusb_hotplug_event event,void * user_data)56 static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
57 {
58 printf ("Device detached\n");
59
60 if (handle) {
61 libusb_close (handle);
62 handle = NULL;
63 }
64
65 done++;
66
67 return 0;
68 }
69
main(int argc,char * argv[])70 int main(int argc, char *argv[])
71 {
72 libusb_hotplug_callback_handle hp[2];
73 int product_id, vendor_id, class_id;
74 int rc;
75
76 vendor_id = (argc > 1) ? (int)strtol (argv[1], NULL, 0) : 0x045a;
77 product_id = (argc > 2) ? (int)strtol (argv[2], NULL, 0) : 0x5005;
78 class_id = (argc > 3) ? (int)strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
79
80 rc = libusb_init (NULL);
81 if (rc < 0)
82 {
83 printf("failed to initialise libusb: %s\n", libusb_error_name(rc));
84 return EXIT_FAILURE;
85 }
86
87 if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
88 printf ("Hotplug capabilites are not supported on this platform\n");
89 libusb_exit (NULL);
90 return EXIT_FAILURE;
91 }
92
93 rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
94 product_id, class_id, hotplug_callback, NULL, &hp[0]);
95 if (LIBUSB_SUCCESS != rc) {
96 fprintf (stderr, "Error registering callback 0\n");
97 libusb_exit (NULL);
98 return EXIT_FAILURE;
99 }
100
101 rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
102 product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
103 if (LIBUSB_SUCCESS != rc) {
104 fprintf (stderr, "Error registering callback 1\n");
105 libusb_exit (NULL);
106 return EXIT_FAILURE;
107 }
108
109 while (done < 2) {
110 rc = libusb_handle_events (NULL);
111 if (rc < 0)
112 printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
113 }
114
115 if (handle) {
116 libusb_close (handle);
117 }
118
119 libusb_exit (NULL);
120
121 return EXIT_SUCCESS;
122 }
123