/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
/*
 * libusb example program for hotplug API
 * Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.ccom>
 *
 * 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;

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;

rc = libusb_get_device_descriptor(dev, &desc);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error getting device descriptor\n");
}

printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);

libusb_open (dev,
&handle);

done++;

return 0;
}

static int LIBUSB_CALL
hotplug_callback_detach(libusb_context
*ctx,
libusb_device *dev, libusb_hotplug_event
event,
void *user_data
)
{
printf ("Device detached\n");

libusb_close (handle);

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) ? strtol(argv[1], NULL, 0) : 0x045a;
	product_id = (argc > 2) ? strtol(argv[2], NULL, 0) : 0x5005;
	class_id = (argc > 3) ? strtol(argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;

	rc = libusb_init(NULL);
	if (rc < 0) {
		printf("failed to initialise libusb: %s\n", libusb_error_name(rc));
		return EXIT_FAILURE;
	}

	if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
		printf("Hotplug capabilites 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 (rc < 0)
			printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
	}

	libusb_exit(NULL);
}
