2 * input_id - input device classification
4 * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
5 * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with keymap; if not, write to the Free Software Foundation,
19 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 #include <linux/limits.h>
27 #include <linux/input.h>
31 /* we must use this kernel-compatible implementation */
32 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
33 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
34 #define OFF(x) ((x)%BITS_PER_LONG)
35 #define BIT(x) (1UL<<OFF(x))
36 #define LONG(x) ((x)/BITS_PER_LONG)
37 #define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
40 * Read a capability attribute and return bitmask.
41 * @param dev udev_device
42 * @param attr sysfs attribute name (e. g. "capabilities/key")
43 * @param bitmask: Output array; must have max_size elements
45 static void get_cap_mask (struct udev_device *dev, const char* attr,
46 unsigned long *bitmask, size_t max_size)
53 snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(dev, attr));
55 memset (bitmask, 0, max_size);
57 while ((word = strrchr(text, ' ')) != NULL) {
58 val = strtoul (word+1, NULL, 16);
63 val = strtoul (text, NULL, 16);
68 static void test_pointers (const unsigned long* bitmask_ev,
69 const unsigned long* bitmask_abs,
70 const unsigned long* bitmask_key,
71 const unsigned long* bitmask_rel)
76 if (!test_bit (EV_KEY, bitmask_ev))
79 if (test_bit (EV_ABS, bitmask_ev) &&
80 test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
81 if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
82 puts("ID_INPUT_TABLET=1");
83 else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
85 else if (test_bit (BTN_TRIGGER, bitmask_key) ||
86 test_bit (BTN_A, bitmask_key) ||
87 test_bit (BTN_1, bitmask_key))
88 puts("ID_INPUT_JOYSTICK=1");
89 else if (test_bit (BTN_MOUSE, bitmask_key))
90 /* This path is taken by VMware's USB mouse, which has
91 * absolute axes, but no touch/pressure button. */
93 else if (test_bit (BTN_TOUCH, bitmask_key))
94 puts("ID_INPUT_TOUCHSCREEN=1");
97 if (test_bit (EV_REL, bitmask_ev) &&
98 test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
99 test_bit (BTN_MOUSE, bitmask_key))
103 puts("ID_INPUT_MOUSE=1");
105 puts("ID_INPUT_TOUCHPAD=1");
108 /* key like devices */
109 static void test_key (const unsigned long* bitmask_ev,
110 const unsigned long* bitmask_key)
116 /* do we have any KEY_* capability? */
117 if (!test_bit (EV_KEY, bitmask_ev))
121 for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i)
122 acc |= bitmask_key[i];
124 puts("ID_INPUT_KEY=1");
126 /* the first 32 bits are ESC, numbers, and Q to D; if we have all of
127 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
129 if ((bitmask_key[0] & mask) == mask)
130 puts("ID_INPUT_KEYBOARD=1");
133 int main (int argc, char** argv)
136 struct udev_device *dev;
138 char devpath[PATH_MAX];
139 unsigned long bitmask_ev[NBITS(EV_MAX)];
140 unsigned long bitmask_abs[NBITS(ABS_MAX)];
141 unsigned long bitmask_key[NBITS(KEY_MAX)];
142 unsigned long bitmask_rel[NBITS(REL_MAX)];
145 fprintf(stderr, "Usage: %s <device path (without /sys)>\n", argv[0]);
154 snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[1]);
155 dev = udev_device_new_from_syspath(udev, devpath);
157 fprintf(stderr, "unable to access '%s'\n", devpath);
161 /* walk up the parental chain until we find the real input device; the
162 * argument is very likely a subdevice of this, like eventN */
163 while (dev != NULL && udev_device_get_sysattr_value(dev, "capabilities/ev") == NULL)
164 dev = udev_device_get_parent_with_subsystem_devtype(dev, "input", NULL);
166 /* not an "input" class device */
170 /* Use this as a flag that input devices were detected, so that this
171 * program doesn't need to be called more than once per device */
174 get_cap_mask (dev, "capabilities/ev", bitmask_ev, sizeof (bitmask_ev));
175 get_cap_mask (dev, "capabilities/abs", bitmask_abs, sizeof (bitmask_abs));
176 get_cap_mask (dev, "capabilities/rel", bitmask_rel, sizeof (bitmask_rel));
177 get_cap_mask (dev, "capabilities/key", bitmask_key, sizeof (bitmask_key));
179 test_pointers(bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel);
181 test_key(bitmask_ev, bitmask_key);