1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* evdev_id - extracts miscellaneous information from evdev devices
*
* Copyright (C) 2014 Red Hat
* Author:
* Carlos Garnacho <carlosg@gnome.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with keymap; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <linux/input.h>
#include "udev.h"
#include "util.h"
static inline int abs_size_mm(const struct input_absinfo *absinfo) {
/* Resolution is defined to be in units/mm for ABS_X/Y */
return (absinfo->maximum - absinfo->minimum) / absinfo->resolution;
}
static void extract_info(struct udev_device *dev, const char *devpath, bool test) {
char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)];
struct input_absinfo xabsinfo = {}, yabsinfo = {};
_cleanup_close_ int fd = -1;
fd = open(devpath, O_RDONLY|O_CLOEXEC);
if (fd < 0)
return;
if (ioctl(fd, EVIOCGABS(ABS_X), &xabsinfo) < 0 ||
ioctl(fd, EVIOCGABS(ABS_Y), &yabsinfo) < 0)
return;
if (xabsinfo.resolution <= 0 || yabsinfo.resolution <= 0)
return;
snprintf(width, sizeof(width), "%d", abs_size_mm(&xabsinfo));
snprintf(height, sizeof(height), "%d", abs_size_mm(&yabsinfo));
udev_builtin_add_property(dev, test, "ID_INPUT_WIDTH_MM", width);
udev_builtin_add_property(dev, test, "ID_INPUT_HEIGHT_MM", height);
}
static int builtin_evdev_id(struct udev_device *dev, int argc, char *argv[], bool test) {
const char *subsystem;
const char *devnode;
subsystem = udev_device_get_subsystem(dev);
if (!subsystem || !streq(subsystem, "input"))
return EXIT_SUCCESS;
devnode = udev_device_get_devnode(dev);
/* not an evdev node */
if (!devnode)
return EXIT_SUCCESS;
extract_info(dev, devnode, test);
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_evdev_id = {
.name = "evdev_id",
.cmd = builtin_evdev_id,
.help = "evdev devices information",
};
|
