/*
 * Copyright (c) 2009		Johannes Berg
 * Copyright (c) 2009		Luis R. Rodriguez
 * 
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/uinput.h>
#include <unistd.h>

/*
 * You will need CONFIG_INPUT_UINPUT enabled, if
 * enabled as a module modprobe uinput
 */

int main(int argc, char **argv)
{
	struct uinput_user_dev dev;
	struct input_event ev;
	int fd, ret;

	/* Tells the kernel to kmalloc() a uinput device for us */
	fd = open("/dev/input/uinput", O_WRONLY | O_NDELAY);
	if (fd < 0) {
		perror("open uinput");
		if (errno == ENOENT)
			fprintf(stderr, "Try \"modprobe uinput\".\n");
		return 1;
	}

	memset(&dev, 0, sizeof(dev));
	strcpy(dev.name, "virt-rfkill");

	/* sets up uinput device, all we need is a name */
	ret = write(fd, &dev, sizeof(dev));
	if (ret != sizeof(dev)) {
		perror("write setup");
		return 1;
	}

	/* sets "EV_KEY" bit on the the uinput dev's evbit */
	if (ioctl(fd, UI_SET_EVBIT, EV_KEY)) {
		perror("set key event");
		return 1;
	}

	/* sets "KEY_WLAN" bit on the the uinput dev's keybit */
	if (ioctl(fd, UI_SET_KEYBIT, KEY_WLAN)) {
		perror("set wlan key");
		return 1;
	}

	/* create an input device for uinput device */
	ret = ioctl(fd, UI_DEV_CREATE);
	if (ret) {
		perror("create input device");
		return 1;
	}

	/*
	 * write events -- once a uinput device has been set up writes
	 * inject events which show up in the virtual input device.
	 */
	memset(&ev, 0, sizeof(ev));
	ev.type = EV_KEY;
	ev.code = KEY_WLAN;
	/* button down */
	ev.value = 1;
	ret = write(fd, &ev, sizeof(ev));
	if (ret != sizeof(ev)) {
		perror("write event");
		return 1;
	}
	/* and up again - that's a press */
	ev.value = 0;
	ret = write(fd, &ev, sizeof(ev));
	if (ret != sizeof(ev)) {
		perror("write event");
		return 1;
	}

	return 0;
}