7801ff94fa
The internal API is changing as follows: - Adding two new functions. usbi_connect_device, and usbi_disconnect_device. Backends must call these functions to add them to the context's device list at one of two places: initial enumeration (done at init), and on device attach and removal. These functions need to be called once per context. - Backends that support hotplug should not provide a get_device_list funtion. This function is now deprecated and will likely be removed once all backends support hotplug. The external API is changing as follows: - Two new functions have been added to register and deregister callbacks for hotplug notification: libusb_hotplug_register_callback(), libusb_hotplug_deregister_callback(). Hotplug callbacks are called by libusb_handle_events(). Details of the new API can be found in libusb.h. - A new capability check has been added to check for hotplug support. See LIBUSB_CAP_HAS_HOTPLUG. Aa suggested by Xiaofan add new example has been added to show how to use the new external hotplug API. See examples/hotplugtest.c. Signed-off-by: Hans de Goede <hdegoede@redhat.com>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
|
|
* 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;
|
|
|
|
libusb_init (NULL);
|
|
|
|
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) {
|
|
libusb_handle_events (NULL);
|
|
}
|
|
|
|
libusb_exit (NULL);
|
|
}
|