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/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
/*
* libusb example program for hotplug API
* Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include "libusb.h"
int done = 0;
libusb_device_handle *handle = NULL;
static int LIBUSB_CALL hotplug_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
struct libusb_device_descriptor desc;
int rc;
(void)ctx;
(void)dev;
(void)event;
(void)user_data;
rc = libusb_get_device_descriptor(dev, &desc);
if (LIBUSB_SUCCESS == rc) {
printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
} else {
printf ("Device attached\n");
fprintf (stderr, "Error getting device descriptor: %s\n",
libusb_strerror((enum libusb_error)rc));
}
if (handle) {
libusb_close (handle);
handle = NULL;
}
rc = libusb_open (dev, &handle);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "No access to device: %s\n",
libusb_strerror((enum libusb_error)rc));
}
done++;
return 0;
}
static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
struct libusb_device_descriptor desc;
int rc;
(void)ctx;
(void)dev;
(void)event;
(void)user_data;
rc = libusb_get_device_descriptor(dev, &desc);
if (LIBUSB_SUCCESS == rc) {
printf ("Device detached: %04x:%04x\n", desc.idVendor, desc.idProduct);
} else {
printf ("Device detached\n");
fprintf (stderr, "Error getting device descriptor: %s\n",
libusb_strerror((enum libusb_error)rc));
}
if (handle) {
libusb_close (handle);
handle = NULL;
}
done++;
return 0;
}
int main(int argc, char *argv[])
{
libusb_hotplug_callback_handle hp[2];
int product_id, vendor_id, class_id;
int rc;
vendor_id = (argc > 1) ? (int)strtol (argv[1], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
product_id = (argc > 2) ? (int)strtol (argv[2], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
class_id = (argc > 3) ? (int)strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
rc = libusb_init_context(/*ctx=*/NULL, /*options=*/NULL, /*num_options=*/0);
if (LIBUSB_SUCCESS != rc)
{
printf ("failed to initialise libusb: %s\n",
libusb_strerror((enum libusb_error)rc));
return EXIT_FAILURE;
}
if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
printf ("Hotplug capabilities are not supported on this platform\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
product_id, class_id, hotplug_callback, NULL, &hp[0]);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error registering callback 0\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error registering callback 1\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
while (done < 2) {
rc = libusb_handle_events (NULL);
if (LIBUSB_SUCCESS != rc)
printf ("libusb_handle_events() failed: %s\n",
libusb_strerror((enum libusb_error)rc));
}
if (handle) {
libusb_close (handle);
}
libusb_exit (NULL);
return EXIT_SUCCESS;
}
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