2 * compose persistent device path
4 * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
5 * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
6 * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
7 * Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
29 #include <linux/limits.h>
30 #include <linux/input.h>
34 /* we must use this kernel-compatible implementation */
35 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
36 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
37 #define OFF(x) ((x)%BITS_PER_LONG)
38 #define BIT(x) (1UL<<OFF(x))
39 #define LONG(x) ((x)/BITS_PER_LONG)
40 #define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
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,
49 struct udev_device *pdev, const char* attr,
50 unsigned long *bitmask, size_t bitmask_size,
58 v = udev_device_get_sysattr_value(pdev, attr);
62 snprintf(text, sizeof(text), "%s", v);
63 log_debug("%s raw kernel attribute: %s", attr, text);
65 memzero(bitmask, bitmask_size);
67 while ((word = strrchr(text, ' ')) != NULL) {
68 val = strtoul (word+1, NULL, 16);
69 if (i < bitmask_size/sizeof(unsigned long))
72 log_debug("ignoring %s block %lX which is larger than maximum size", attr, val);
76 val = strtoul (text, NULL, 16);
77 if (i < bitmask_size / sizeof(unsigned long))
80 log_debug("ignoring %s block %lX which is larger than maximum size", attr, val);
83 /* printf pattern with the right unsigned long number of hex chars */
84 snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2 * sizeof(unsigned long));
85 log_debug("%s decoded bit map:", attr);
86 val = bitmask_size / sizeof (unsigned long);
87 /* skip over leading zeros */
88 while (bitmask[val-1] == 0 && val > 0)
90 for (i = 0; i < val; ++i) {
91 DISABLE_WARNING_FORMAT_NONLITERAL;
92 log_debug(text, i * BITS_PER_LONG, bitmask[i]);
99 static void test_pointers (struct udev_device *dev,
100 const unsigned long* bitmask_ev,
101 const unsigned long* bitmask_abs,
102 const unsigned long* bitmask_key,
103 const unsigned long* bitmask_rel,
108 if (!test_bit (EV_KEY, bitmask_ev)) {
109 if (test_bit (EV_ABS, bitmask_ev) &&
110 test_bit (ABS_X, bitmask_abs) &&
111 test_bit (ABS_Y, bitmask_abs) &&
112 test_bit (ABS_Z, bitmask_abs))
113 udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1");
117 if (test_bit (EV_ABS, bitmask_ev) &&
118 test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
119 if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
120 udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1");
121 else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
123 else if (test_bit (BTN_MOUSE, bitmask_key))
124 /* This path is taken by VMware's USB mouse, which has
125 * absolute axes, but no touch/pressure button. */
127 else if (test_bit (BTN_TOUCH, bitmask_key))
128 udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1");
129 /* joysticks don't necessarily have to have buttons; e. g.
130 * rudders/pedals are joystick-like, but buttonless; they have
131 * other fancy axes */
132 else if (test_bit (BTN_TRIGGER, bitmask_key) ||
133 test_bit (BTN_A, bitmask_key) ||
134 test_bit (BTN_1, bitmask_key) ||
135 test_bit (ABS_RX, bitmask_abs) ||
136 test_bit (ABS_RY, bitmask_abs) ||
137 test_bit (ABS_RZ, bitmask_abs) ||
138 test_bit (ABS_THROTTLE, bitmask_abs) ||
139 test_bit (ABS_RUDDER, bitmask_abs) ||
140 test_bit (ABS_WHEEL, bitmask_abs) ||
141 test_bit (ABS_GAS, bitmask_abs) ||
142 test_bit (ABS_BRAKE, bitmask_abs))
143 udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1");
146 if (test_bit (EV_REL, bitmask_ev) &&
147 test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
148 test_bit (BTN_MOUSE, bitmask_key))
152 udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1");
154 udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1");
157 /* key like devices */
158 static void test_key (struct udev_device *dev,
159 const unsigned long* bitmask_ev,
160 const unsigned long* bitmask_key,
166 /* do we have any KEY_* capability? */
167 if (!test_bit (EV_KEY, bitmask_ev)) {
168 log_debug("test_key: no EV_KEY capability");
172 /* only consider KEY_* here, not BTN_* */
174 for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
175 found |= bitmask_key[i];
176 log_debug("test_key: checking bit block %lu for any keys; found=%i", (unsigned long)i*BITS_PER_LONG, found > 0);
178 /* If there are no keys in the lower block, check the higher block */
180 for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) {
181 if (test_bit (i, bitmask_key)) {
182 log_debug("test_key: Found key %x in high block", i);
190 udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1");
192 /* the first 32 bits are ESC, numbers, and Q to D; if we have all of
193 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
195 if ((bitmask_key[0] & mask) == mask)
196 udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1");
199 static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test) {
200 struct udev_device *pdev;
201 unsigned long bitmask_ev[NBITS(EV_MAX)];
202 unsigned long bitmask_abs[NBITS(ABS_MAX)];
203 unsigned long bitmask_key[NBITS(KEY_MAX)];
204 unsigned long bitmask_rel[NBITS(REL_MAX)];
206 /* walk up the parental chain until we find the real input device; the
207 * argument is very likely a subdevice of this, like eventN */
209 while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL)
210 pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
212 /* not an "input" class device */
216 /* Use this as a flag that input devices were detected, so that this
217 * program doesn't need to be called more than once per device */
218 udev_builtin_add_property(dev, test, "ID_INPUT", "1");
219 get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test);
220 get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test);
221 get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test);
222 get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test);
223 test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, test);
224 test_key(dev, bitmask_ev, bitmask_key, test);
228 const struct udev_builtin udev_builtin_input_id = {
230 .cmd = builtin_input_id,
231 .help = "Input device properties",