| /* -*- 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) { |
| fprintf (stderr, "Error getting device descriptor\n"); |
| } |
| |
| printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct); |
| |
| if (handle) { |
| libusb_close (handle); |
| handle = NULL; |
| } |
| |
| rc = libusb_open (dev, &handle); |
| if (LIBUSB_SUCCESS != rc) { |
| fprintf (stderr, "Error opening device\n"); |
| } |
| |
| done++; |
| |
| return 0; |
| } |
| |
| static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data) |
| { |
| (void)ctx; |
| (void)dev; |
| (void)event; |
| (void)user_data; |
| |
| printf ("Device detached\n"); |
| |
| 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) : 0x045a; |
| product_id = (argc > 2) ? (int)strtol (argv[2], NULL, 0) : 0x5005; |
| class_id = (argc > 3) ? (int)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)); |
| } |
| |
| if (handle) { |
| libusb_close (handle); |
| } |
| |
| libusb_exit (NULL); |
| |
| return EXIT_SUCCESS; |
| } |