xref: /third_party/libinput/udev/libinput-fuzz-to-zero.c

/*
 * Copyright © 2015 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <libudev.h>
#include <linux/input.h>
#include <libevdev/libevdev.h>

#include "util-macros.h"

static void
reset_absfuzz_to_zero(struct udev_device *device)
{
	const char *devnode;
	struct libevdev *evdev = NULL;
	int fd = -1;
	int rc;
	unsigned int axes[] = {ABS_X,
			       ABS_Y,
			       ABS_MT_POSITION_X,
			       ABS_MT_POSITION_Y};

	devnode = udev_device_get_devnode(device);
	if (!devnode)
		goto out;

	fd = open(devnode, O_RDWR);
	if (fd < 0)
		goto out;

	rc = libevdev_new_from_fd(fd, &evdev);
	if (rc != 0)
		goto out;

	if (!libevdev_has_event_type(evdev, EV_ABS))
		goto out;

	ARRAY_FOR_EACH(axes, code) {
		struct input_absinfo abs;
		int fuzz;

		fuzz = libevdev_get_abs_fuzz(evdev, *code);
		if (!fuzz)
			continue;

		abs = *libevdev_get_abs_info(evdev, *code);
		abs.fuzz = 0;
		libevdev_kernel_set_abs_info(evdev, *code, &abs);
	}

out:
	close(fd);
	libevdev_free(evdev);
}

int main(int argc, char **argv)
{
	int rc = 1;
	struct udev *udev = NULL;
	struct udev_device *device = NULL;
	const char *syspath;

	if (argc != 2)
		return 1;

	syspath = argv[1];

	udev = udev_new();
	if (!udev)
		goto out;

	device = udev_device_new_from_syspath(udev, syspath);
	if (!device)
		goto out;

	reset_absfuzz_to_zero(device);

	rc = 0;

out:
	if (device)
		udev_device_unref(device);
	if (udev)
		udev_unref(udev);

	return rc;
}