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>
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #include <linux/limits.h>
29 #include <linux/input.h>
33 /* we must use this kernel-compatible implementation */
34 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
35 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
36 #define OFF(x) ((x)%BITS_PER_LONG)
37 #define BIT(x) (1UL<<OFF(x))
38 #define LONG(x) ((x)/BITS_PER_LONG)
39 #define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
41 #pragma GCC diagnostic push
42 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
44 * Read a capability attribute and return bitmask.
45 * @param dev udev_device
46 * @param attr sysfs attribute name (e. g. "capabilities/key")
47 * @param bitmask: Output array which has a sizeof of bitmask_size
49 static void get_cap_mask(struct udev_device *dev,
50 struct udev_device *pdev, const char* attr,
51 unsigned long *bitmask, size_t bitmask_size,
59 snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(pdev, attr));
60 log_debug("%s raw kernel attribute: %s\n", attr, text);
62 memset (bitmask, 0, bitmask_size);
64 while ((word = strrchr(text, ' ')) != NULL) {
65 val = strtoul (word+1, NULL, 16);
66 if (i < bitmask_size/sizeof(unsigned long))
69 log_debug("ignoring %s block %lX which is larger than maximum size\n", attr, val);
73 val = strtoul (text, NULL, 16);
74 if (i < bitmask_size / sizeof(unsigned long))
77 log_debug("ignoring %s block %lX which is larger than maximum size\n", attr, val);
80 /* printf pattern with the right unsigned long number of hex chars */
81 snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2 * sizeof(unsigned long));
82 log_debug("%s decoded bit map:\n", attr);
83 val = bitmask_size / sizeof (unsigned long);
84 /* skip over leading zeros */
85 while (bitmask[val-1] == 0 && val > 0)
87 for (i = 0; i < val; ++i)
88 log_debug(text, i * BITS_PER_LONG, bitmask[i]);
91 #pragma GCC diagnostic pop
94 static void test_pointers (struct udev_device *dev,
95 const unsigned long* bitmask_ev,
96 const unsigned long* bitmask_abs,
97 const unsigned long* bitmask_key,
98 const unsigned long* bitmask_rel,
104 if (!test_bit (EV_KEY, bitmask_ev)) {
105 if (test_bit (EV_ABS, bitmask_ev) &&
106 test_bit (ABS_X, bitmask_abs) &&
107 test_bit (ABS_Y, bitmask_abs) &&
108 test_bit (ABS_Z, bitmask_abs))
109 udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1");
113 if (test_bit (EV_ABS, bitmask_ev) &&
114 test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
115 if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
116 udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1");
117 else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
119 else if (test_bit (BTN_TRIGGER, bitmask_key) ||
120 test_bit (BTN_A, bitmask_key) ||
121 test_bit (BTN_1, bitmask_key))
122 udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1");
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");
131 if (test_bit (EV_REL, bitmask_ev) &&
132 test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
133 test_bit (BTN_MOUSE, bitmask_key))
137 udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1");
139 udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1");
142 /* key like devices */
143 static void test_key (struct udev_device *dev,
144 const unsigned long* bitmask_ev,
145 const unsigned long* bitmask_key,
152 /* do we have any KEY_* capability? */
153 if (!test_bit (EV_KEY, bitmask_ev)) {
154 log_debug("test_key: no EV_KEY capability\n");
158 /* only consider KEY_* here, not BTN_* */
160 for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
161 found |= bitmask_key[i];
162 log_debug("test_key: checking bit block %lu for any keys; found=%i\n", (unsigned long)i*BITS_PER_LONG, found > 0);
164 /* If there are no keys in the lower block, check the higher block */
166 for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) {
167 if (test_bit (i, bitmask_key)) {
168 log_debug("test_key: Found key %x in high block\n", i);
176 udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1");
178 /* the first 32 bits are ESC, numbers, and Q to D; if we have all of
179 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
181 if ((bitmask_key[0] & mask) == mask)
182 udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1");
185 static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test)
187 struct udev_device *pdev;
188 unsigned long bitmask_ev[NBITS(EV_MAX)];
189 unsigned long bitmask_abs[NBITS(ABS_MAX)];
190 unsigned long bitmask_key[NBITS(KEY_MAX)];
191 unsigned long bitmask_rel[NBITS(REL_MAX)];
193 /* walk up the parental chain until we find the real input device; the
194 * argument is very likely a subdevice of this, like eventN */
196 while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL)
197 pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
199 /* not an "input" class device */
203 /* Use this as a flag that input devices were detected, so that this
204 * program doesn't need to be called more than once per device */
205 udev_builtin_add_property(dev, test, "ID_INPUT", "1");
206 get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test);
207 get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test);
208 get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test);
209 get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test);
210 test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, test);
211 test_key(dev, bitmask_ev, bitmask_key, test);
215 const struct udev_builtin udev_builtin_input_id = {
217 .cmd = builtin_input_id,
218 .help = "input device properties",