1 files changed, 124 insertions, 0 deletions
diff --git a/udev/libinput-fuzz-override.c b/udev/libinput-fuzz-override.c
new file mode 100644
index 00000000..bb05886c
--- /dev/null
+++ b/udev/libinput-fuzz-override.c
@@ -0,0 +1,124 @@
+/*
+ * 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 <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <libudev.h>
+#include <linux/input.h>
+#include <libevdev/libevdev.h>
+
+#include "libinput-util.h"
+
+/**
+ * For a non-zero fuzz on the x/y axes, print that fuzz as property and
+ * reset the kernel's fuzz to 0.
+ * https://bugs.freedesktop.org/show_bug.cgi?id=105202
+ */
+static void
+handle_absfuzz(struct udev_device *device)
+{
+	const char *devnode;
+	struct libevdev *evdev = NULL;
+	int fd = -1;
+	int rc;
+	unsigned int *code;
+	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 == -1 && errno == EACCES)
+		fd = open(devnode, O_RDONLY);
+	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);
+
+		printf("LIBINPUT_FUZZ_%02x=%d\n", *code, fuzz);
+	}
+
+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;
+
+	handle_absfuzz(device);
+
+	rc = 0;
+
+out:
+	if (device)
+		udev_device_unref(device);
+	if (udev)
+		udev_unref(udev);
+
+	return rc;
+}