examples/hotplugtest.c

   1 /*
   2  * libusb example program for hotplug API
   3  * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.ccom>
   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 <stdlib.h>
  21 #include <stdio.h>
  22
  23 #include "libusb.h"
  24
  25 int done = 0;
  26 libusb_device_handle *handle;
  27
  28 static int LIBUSB_CALL hotplug_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
  29 {
  30         struct libusb_device_descriptor desc;
  31         int rc;
  32
  33         rc = libusb_get_device_descriptor(dev, &desc);
  34         if (LIBUSB_SUCCESS != rc) {
  35                 fprintf (stderr, "Error getting device descriptor\n");
  36         }
  37
  38         printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
  39
  40         libusb_open (dev, &handle);
  41
  42         done++;
  43
  44         return 0;
  45 }
  46
  47 static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
  48 {
  49         printf ("Device detached\n");
  50
  51         libusb_close (handle);
  52
  53         done++;
  54         return 0;
  55 }
  56
  57 int main(int argc, char *argv[])
  58 {
  59         libusb_hotplug_callback_handle hp[2];
  60         int product_id, vendor_id, class_id;
  61         int rc;
  62
  63         vendor_id  = (argc > 1) ? strtol (argv[1], NULL, 0) : 0x045a;
  64         product_id = (argc > 2) ? strtol (argv[2], NULL, 0) : 0x5005;
  65         class_id   = (argc > 3) ? strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
  66
  67         libusb_init (NULL);
  68
  69         if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
  70                 printf ("Hotplug capabilites are not supported on this platform\n");
  71                 libusb_exit (NULL);
  72                 return EXIT_FAILURE;
  73         }
  74
  75         rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
  76                 product_id, class_id, hotplug_callback, NULL, &hp[0]);
  77         if (LIBUSB_SUCCESS != rc) {
  78                 fprintf (stderr, "Error registering callback 0\n");
  79                 libusb_exit (NULL);
  80                 return EXIT_FAILURE;
  81         }
  82
  83         rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
  84                 product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
  85         if (LIBUSB_SUCCESS != rc) {
  86                 fprintf (stderr, "Error registering callback 1\n");
  87                 libusb_exit (NULL);
  88                 return EXIT_FAILURE;
  89         }
  90
  91         while (done < 2) {
  92                 libusb_handle_events (NULL);
  93         }
  94
  95         libusb_exit (NULL);
  96 }