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 #define DBG(format, args...) { if (debug) fprintf(stderr, format, ##args); }
43 * Read a capability attribute and return bitmask.
44 * @param dev udev_device
45 * @param attr sysfs attribute name (e. g. "capabilities/key")
46 * @param bitmask: Output array which has a sizeof of bitmask_size
48 static void get_cap_mask (struct udev_device *dev, const char* attr,
49 unsigned long *bitmask, size_t bitmask_size)
56 snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(dev, attr));
58 DBG("%s raw kernel attribute: %s\n", attr, text);
60 memset (bitmask, 0, bitmask_size);
62 while ((word = strrchr(text, ' ')) != NULL) {
63 val = strtoul (word+1, NULL, 16);
68 val = strtoul (text, NULL, 16);
72 /* printf pattern with the right unsigned long number of hex chars */
73 snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2*sizeof(unsigned long));
74 DBG("%s decoded bit map:\n", attr);
75 val = bitmask_size/sizeof (unsigned long);
76 /* skip over leading zeros */
77 while (bitmask[val-1] == 0 && val > 0)
79 for (i = 0; i < val; ++i)
80 DBG(text, i * BITS_PER_LONG, bitmask[i]);
85 static void test_pointers (const unsigned long* bitmask_ev,
86 const unsigned long* bitmask_abs,
87 const unsigned long* bitmask_key,
88 const unsigned long* bitmask_rel)
93 if (!test_bit (EV_KEY, bitmask_ev))
96 if (test_bit (EV_ABS, bitmask_ev) &&
97 test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
98 if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
99 puts("ID_INPUT_TABLET=1");
100 else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
102 else if (test_bit (BTN_TRIGGER, bitmask_key) ||
103 test_bit (BTN_A, bitmask_key) ||
104 test_bit (BTN_1, bitmask_key))
105 puts("ID_INPUT_JOYSTICK=1");
106 else if (test_bit (BTN_MOUSE, bitmask_key))
107 /* This path is taken by VMware's USB mouse, which has
108 * absolute axes, but no touch/pressure button. */
110 else if (test_bit (BTN_TOUCH, bitmask_key))
111 puts("ID_INPUT_TOUCHSCREEN=1");
114 if (test_bit (EV_REL, bitmask_ev) &&
115 test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
116 test_bit (BTN_MOUSE, bitmask_key))
120 puts("ID_INPUT_MOUSE=1");
122 puts("ID_INPUT_TOUCHPAD=1");
125 /* key like devices */
126 static void test_key (const unsigned long* bitmask_ev,
127 const unsigned long* bitmask_key)
133 /* do we have any KEY_* capability? */
134 if (!test_bit (EV_KEY, bitmask_ev)) {
135 DBG("test_key: no EV_KEY capability\n");
139 /* only consider KEY_* here, not BTN_* */
141 for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
142 found |= bitmask_key[i];
143 DBG("test_key: checking bit block %lu for any keys; found=%i\n", i*BITS_PER_LONG, found > 0);
146 puts("ID_INPUT_KEY=1");
148 /* the first 32 bits are ESC, numbers, and Q to D; if we have all of
149 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
151 if ((bitmask_key[0] & mask) == mask)
152 puts("ID_INPUT_KEYBOARD=1");
155 int main (int argc, char** argv)
158 struct udev_device *dev;
160 char devpath[PATH_MAX];
161 unsigned long bitmask_ev[NBITS(EV_MAX)];
162 unsigned long bitmask_abs[NBITS(ABS_MAX)];
163 unsigned long bitmask_key[NBITS(KEY_MAX)];
164 unsigned long bitmask_rel[NBITS(REL_MAX)];
167 fprintf(stderr, "Usage: %s <device path (without /sys)>\n", argv[0]);
171 if (getenv ("DEBUG"))
179 snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[1]);
180 dev = udev_device_new_from_syspath(udev, devpath);
182 fprintf(stderr, "unable to access '%s'\n", devpath);
186 /* walk up the parental chain until we find the real input device; the
187 * argument is very likely a subdevice of this, like eventN */
188 while (dev != NULL && udev_device_get_sysattr_value(dev, "capabilities/ev") == NULL)
189 dev = udev_device_get_parent_with_subsystem_devtype(dev, "input", NULL);
191 /* not an "input" class device */
195 /* Use this as a flag that input devices were detected, so that this
196 * program doesn't need to be called more than once per device */
199 get_cap_mask (dev, "capabilities/ev", bitmask_ev, sizeof (bitmask_ev));
200 get_cap_mask (dev, "capabilities/abs", bitmask_abs, sizeof (bitmask_abs));
201 get_cap_mask (dev, "capabilities/rel", bitmask_rel, sizeof (bitmask_rel));
202 get_cap_mask (dev, "capabilities/key", bitmask_key, sizeof (bitmask_key));
204 test_pointers(bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel);
206 test_key(bitmask_ev, bitmask_key);