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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* input_id - input device classification
*
* Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
* Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
*
* 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <linux/input.h>
#include "libudev.h"
/* we must use this kernel-compatible implementation */
#define BITS_PER_LONG (sizeof(unsigned long) * 8)
#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
#define OFF(x) ((x)%BITS_PER_LONG)
#define BIT(x) (1UL<<OFF(x))
#define LONG(x) ((x)/BITS_PER_LONG)
#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
/*
* Read a capability attribute and return bitmask.
* @param dev udev_device
* @param attr sysfs attribute name (e. g. "capabilities/key")
* @param bitmask: Output array; must have max_size elements
*/
static void get_cap_mask (struct udev_device *dev, const char* attr,
unsigned long *bitmask, size_t max_size)
{
char text[4096];
int i;
char* word;
unsigned long val;
snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(dev, attr));
memset (bitmask, 0, max_size);
i = 0;
while ((word = strrchr(text, ' ')) != NULL) {
val = strtoul (word+1, NULL, 16);
bitmask[i] = val;
*word = '\0';
++i;
}
val = strtoul (text, NULL, 16);
bitmask[i] = val;
}
/* pointer devices */
static void test_pointers (const unsigned long* bitmask_ev,
const unsigned long* bitmask_abs,
const unsigned long* bitmask_key,
const unsigned long* bitmask_rel)
{
int is_mouse = 0;
int is_touchpad = 0;
if (!test_bit (EV_KEY, bitmask_ev))
return;
if (test_bit (EV_ABS, bitmask_ev) &&
test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
puts("ID_INPUT_TABLET=1");
else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
is_touchpad = 1;
else if (test_bit (BTN_TRIGGER, bitmask_key) ||
test_bit (BTN_A, bitmask_key) ||
test_bit (BTN_1, bitmask_key))
puts("ID_INPUT_JOYSTICK=1");
else if (test_bit (BTN_MOUSE, bitmask_key))
/* This path is taken by VMware's USB mouse, which has
* absolute axes, but no touch/pressure button. */
is_mouse = 1;
}
if (test_bit (EV_REL, bitmask_ev) &&
test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
test_bit (BTN_MOUSE, bitmask_key))
is_mouse = 1;
if (is_mouse)
puts("ID_INPUT_MOUSE=1");
if (is_touchpad)
puts("ID_INPUT_TOUCHPAD=1");
}
/* key like devices */
static void test_key (const unsigned long* bitmask_ev,
const unsigned long* bitmask_key)
{
unsigned i;
unsigned long acc;
unsigned long mask;
/* do we have any KEY_* capability? */
if (!test_bit (EV_KEY, bitmask_ev))
return;
acc = 0;
for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i)
acc |= bitmask_key[i];
if (acc > 0)
puts("ID_INPUT_KEY=1");
/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
* those, consider it a full keyboard; do not test KEY_RESERVED, though */
mask = 0xFFFFFFFE;
if ((bitmask_key[0] & mask) == mask)
puts("ID_INPUT_KEYBOARD=1");
}
int main (int argc, char** argv)
{
struct udev *udev;
struct udev_device *dev;
char devpath[PATH_MAX];
unsigned long bitmask_ev[NBITS(EV_MAX)];
unsigned long bitmask_abs[NBITS(ABS_MAX)];
unsigned long bitmask_key[NBITS(KEY_MAX)];
unsigned long bitmask_rel[NBITS(REL_MAX)];
if (argc != 2) {
fprintf(stderr, "Usage: %s <device path (without /sys)>\n", argv[0]);
exit(1);
}
/* get the device */
udev = udev_new();
if (udev == NULL)
return 1;
snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[1]);
dev = udev_device_new_from_syspath(udev, devpath);
if (dev == NULL) {
fprintf(stderr, "unable to access '%s'\n", devpath);
return 1;
}
/* walk up the parental chain until we find the real input device; the
* argument is very likely a subdevice of this, like eventN */
while (dev != NULL && udev_device_get_sysattr_value(dev, "capabilities/ev") == NULL)
dev = udev_device_get_parent_with_subsystem_devtype(dev, "input", NULL);
/* not an "input" class device */
if (dev == NULL)
return 0;
/* Use this as a flag that input devices were detected, so that this
* program doesn't need to be called more than once per device */
puts("ID_INPUT=1");
get_cap_mask (dev, "capabilities/ev", bitmask_ev, sizeof (bitmask_ev));
get_cap_mask (dev, "capabilities/abs", bitmask_abs, sizeof (bitmask_abs));
get_cap_mask (dev, "capabilities/rel", bitmask_rel, sizeof (bitmask_rel));
get_cap_mask (dev, "capabilities/key", bitmask_key, sizeof (bitmask_key));
test_pointers(bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel);
test_key(bitmask_ev, bitmask_key);
return 0;
}
|
