1 /*
2 * Copyright © 2015 Red Hat, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #include "config.h"
25
26 #include <fcntl.h>
27 #include <stdio.h>
28 #include <stdint.h>
29 #include <unistd.h>
30 #include <libudev.h>
31 #include <linux/input.h>
32 #include <libevdev/libevdev.h>
33
34 #include "util-prop-parsers.h"
35 #include "util-macros.h"
36
37 /**
38 * For a non-zero fuzz on the x/y axes, print that fuzz as property and
39 * reset the kernel's fuzz to 0.
40 * https://bugs.freedesktop.org/show_bug.cgi?id=105202
41 */
42 static void
handle_absfuzz(struct udev_device * device)43 handle_absfuzz(struct udev_device *device)
44 {
45 const char *devnode;
46 struct libevdev *evdev = NULL;
47 int fd = -1;
48 int rc;
49 unsigned int axes[] = {ABS_X,
50 ABS_Y,
51 ABS_MT_POSITION_X,
52 ABS_MT_POSITION_Y};
53
54 devnode = udev_device_get_devnode(device);
55 if (!devnode)
56 goto out;
57
58 fd = open(devnode, O_RDONLY);
59 if (fd < 0)
60 goto out;
61
62 rc = libevdev_new_from_fd(fd, &evdev);
63 if (rc != 0)
64 goto out;
65
66 if (!libevdev_has_event_type(evdev, EV_ABS))
67 goto out;
68
69 ARRAY_FOR_EACH(axes, code) {
70 int fuzz;
71
72 fuzz = libevdev_get_abs_fuzz(evdev, *code);
73 if (fuzz)
74 printf("LIBINPUT_FUZZ_%02x=%d\n", *code, fuzz);
75 }
76
77 out:
78 close(fd);
79 libevdev_free(evdev);
80 }
81
82 /**
83 * Where a device has EVDEV_ABS_... set with a fuzz, that fuzz hasn't been
84 * applied to the kernel yet. So we need to extract it ourselves **and**
85 * update the property so the kernel won't actually set it later.
86 */
87 static void
handle_evdev_abs(struct udev_device * device)88 handle_evdev_abs(struct udev_device *device)
89 {
90 unsigned int axes[] = {ABS_X,
91 ABS_Y,
92 ABS_MT_POSITION_X,
93 ABS_MT_POSITION_Y};
94
95 ARRAY_FOR_EACH(axes, code) {
96 const char *prop;
97 char name[64];
98 uint32_t mask;
99 struct input_absinfo abs;
100
101 snprintf(name, sizeof(name), "EVDEV_ABS_%02X", *code);
102 prop = udev_device_get_property_value(device, name);
103 if (!prop)
104 continue;
105
106 mask = parse_evdev_abs_prop(prop, &abs);
107 if (mask & ABS_MASK_FUZZ)
108 printf("LIBINPUT_FUZZ_%02x=%d\n", *code, abs.fuzz);
109 }
110 }
111
main(int argc,char ** argv)112 int main(int argc, char **argv)
113 {
114 int rc = 1;
115 struct udev *udev = NULL;
116 struct udev_device *device = NULL;
117 const char *syspath;
118
119 if (argc != 2)
120 return 1;
121
122 syspath = argv[1];
123
124 udev = udev_new();
125 if (!udev)
126 goto out;
127
128 device = udev_device_new_from_syspath(udev, syspath);
129 if (!device)
130 goto out;
131
132 handle_absfuzz(device);
133 handle_evdev_abs(device);
134
135 rc = 0;
136
137 out:
138 if (device)
139 udev_device_unref(device);
140 if (udev)
141 udev_unref(udev);
142
143 return rc;
144 }
145