examples/hotplugtest.c

   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.ccom>
   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;
  28
  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         libusb_open (dev, &handle);
  42
  43         done++;
  44
  45         return 0;
  46 }
  47
  48 static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
  49 {
  50         printf ("Device detached\n");
  51
  52         libusb_close (handle);
  53
  54         done++;
  55         return 0;
  56 }
  57
  58 int main(int argc, char *argv[])
  59 {
  60         libusb_hotplug_callback_handle hp[2];
  61         int product_id, vendor_id, class_id;
  62         int rc;
  63
  64         vendor_id  = (argc > 1) ? strtol (argv[1], NULL, 0) : 0x045a;
  65         product_id = (argc > 2) ? strtol (argv[2], NULL, 0) : 0x5005;
  66         class_id   = (argc > 3) ? strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
  67
  68         rc = libusb_init (NULL);
  69         if (rc < 0)
  70         {
  71                 printf("failed to initialise libusb: %s\n", libusb_error_name(rc));
  72                 return EXIT_FAILURE;
  73         }
  74
  75         if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
  76                 printf ("Hotplug capabilites are not supported on this platform\n");
  77                 libusb_exit (NULL);
  78                 return EXIT_FAILURE;
  79         }
  80
  81         rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
  82                 product_id, class_id, hotplug_callback, NULL, &hp[0]);
  83         if (LIBUSB_SUCCESS != rc) {
  84                 fprintf (stderr, "Error registering callback 0\n");
  85                 libusb_exit (NULL);
  86                 return EXIT_FAILURE;
  87         }
  88
  89         rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
  90                 product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
  91         if (LIBUSB_SUCCESS != rc) {
  92                 fprintf (stderr, "Error registering callback 1\n");
  93                 libusb_exit (NULL);
  94                 return EXIT_FAILURE;
  95         }
  96
  97         while (done < 2) {
  98                 rc = libusb_handle_events (NULL);
  99                 if (rc < 0)
 100                         printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
 101         }
 102
 103         libusb_exit (NULL);
 104 }