virtual rfkill button

virtual rfkill button

[Johannes Berg]

Just so I don't lose the code again ...

johannes

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

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

	fd = open("/dev/input/uinput", O_WRONLY);
	if (fd < 0) {
		perror("open");
		if (errno == ENOENT)
			fprintf(stderr, "Try to \"modprobe uinput\".\n");
		return 1;
	}

	/* set up virtual device */
	memset(&dev, 0, sizeof(dev));
	strcpy(dev.name, "virt-rfkill");

	ioctl(fd, UI_SET_EVBIT, EV_KEY);
	ioctl(fd, UI_SET_KEYBIT, KEY_WLAN);

	ret = write(fd, &dev, sizeof(dev));
	if (ret != sizeof(dev)) {
		perror("write setup");
		return 1;
	}

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

	/* write event */
	memset(&ev, 0, sizeof(ev));
	ev.type = EV_KEY;
	ev.code = KEY_WLAN;
	ret = write(fd, &ev, sizeof(ev));
	if (ret != sizeof(ev)) {
		perror("write event");
		return 1;
	}

	return 0;
}

Re: virtual rfkill button

[Johannes Berg]

[-- Attachment #1.1: Type: text/plain, Size: 271 bytes --]

That didn't work, the attached one does... Also a module to show rfkill
working (for my new API rfkill).

The Makefile for the test module is a simple:
obj-m += fake-rfkill.o

and then you do
make -f /lib/modules/$(uname -r)/build/Makefile M=$(pwd)

johannes


[-- Attachment #1.2: fake-rfkill.c --]
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#include <linux/rfkill.h>
#include <linux/module.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");

static struct rfkill *rfk;

static void test_poll(struct rfkill *rfkill, void *data)
{
	printk(KERN_DEBUG "poll test rfkill\n");
}

static void test_query(struct rfkill *rfkill, void *data)
{
	printk(KERN_DEBUG "query test rfkill\n");
}

static int test_set_block(void *data, bool blocked)
{
	printk(KERN_DEBUG "set test rfkill (%s)\n",
		blocked ? "blocked" : "active");
	return 0;
}

static struct rfkill_ops ops = {
	.poll = test_poll,
	.query = test_query,
	.set_block = test_set_block,
};

int mod_init(void)
{
	int err;

	rfk = rfkill_alloc("fake", NULL, RFKILL_TYPE_WLAN, &ops, NULL);
	if (!rfk)
		return -ENOMEM;
	err = rfkill_register(rfk);
	if (err)
		rfkill_destroy(rfk);
	return err;
}
module_init(mod_init);

void mod_exit(void)
{
	rfkill_unregister(rfk);
	rfkill_destroy(rfk);
}
module_exit(mod_exit);

[-- Attachment #1.3: virt-rfkill.c --]
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/*
 * 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;
}

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