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.sievers@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)
42 * Read a capability attribute and return bitmask.
43 * @param dev udev_device
44 * @param attr sysfs attribute name (e. g. "capabilities/key")
45 * @param bitmask: Output array which has a sizeof of bitmask_size
47 static void get_cap_mask(struct udev_device *dev,
48 struct udev_device *pdev, const char* attr,
49 unsigned long *bitmask, size_t bitmask_size,
52 struct udev *udev = udev_device_get_udev(dev);
58 snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(pdev, attr));
59 info(udev, "%s raw kernel attribute: %s\n", attr, text);
61 memset (bitmask, 0, bitmask_size);
63 while ((word = strrchr(text, ' ')) != NULL) {
64 val = strtoul (word+1, NULL, 16);
65 if (i < bitmask_size/sizeof(unsigned long))
68 info(udev, "ignoring %s block %lX which is larger than maximum size\n", attr, val);
72 val = strtoul (text, NULL, 16);
73 if (i < bitmask_size / sizeof(unsigned long))
76 info(udev, "ignoring %s block %lX which is larger than maximum size\n", attr, val);
79 /* printf pattern with the right unsigned long number of hex chars */
80 snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2 * sizeof(unsigned long));
81 info(udev, "%s decoded bit map:\n", attr);
82 val = bitmask_size / sizeof (unsigned long);
83 /* skip over leading zeros */
84 while (bitmask[val-1] == 0 && val > 0)
86 for (i = 0; i < val; ++i)
87 info(udev, text, i * BITS_PER_LONG, bitmask[i]);
92 static void test_pointers (struct udev_device *dev,
93 const unsigned long* bitmask_ev,
94 const unsigned long* bitmask_abs,
95 const unsigned long* bitmask_key,
96 const unsigned long* bitmask_rel,
102 if (!test_bit (EV_KEY, bitmask_ev)) {
103 if (test_bit (EV_ABS, bitmask_ev) &&
104 test_bit (ABS_X, bitmask_abs) &&
105 test_bit (ABS_Y, bitmask_abs) &&
106 test_bit (ABS_Z, bitmask_abs))
107 udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1");
111 if (test_bit (EV_ABS, bitmask_ev) &&
112 test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
113 if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
114 udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1");
115 else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
117 else if (test_bit (BTN_TRIGGER, bitmask_key) ||
118 test_bit (BTN_A, bitmask_key) ||
119 test_bit (BTN_1, bitmask_key))
120 udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1");
121 else if (test_bit (BTN_MOUSE, bitmask_key))
122 /* This path is taken by VMware's USB mouse, which has
123 * absolute axes, but no touch/pressure button. */
125 else if (test_bit (BTN_TOUCH, bitmask_key))
126 udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1");
129 if (test_bit (EV_REL, bitmask_ev) &&
130 test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
131 test_bit (BTN_MOUSE, bitmask_key))
135 udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1");
137 udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1");
140 /* key like devices */
141 static void test_key (struct udev_device *dev,
142 const unsigned long* bitmask_ev,
143 const unsigned long* bitmask_key,
146 struct udev *udev = udev_device_get_udev(dev);
151 /* do we have any KEY_* capability? */
152 if (!test_bit (EV_KEY, bitmask_ev)) {
153 info(udev, "test_key: no EV_KEY capability\n");
157 /* only consider KEY_* here, not BTN_* */
159 for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
160 found |= bitmask_key[i];
161 info(udev, "test_key: checking bit block %lu for any keys; found=%i\n", i*BITS_PER_LONG, found > 0);
163 /* If there are no keys in the lower block, check the higher block */
165 for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) {
166 if (test_bit (i, bitmask_key)) {
167 info(udev, "test_key: Found key %x in high block\n", i);
175 udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1");
177 /* the first 32 bits are ESC, numbers, and Q to D; if we have all of
178 * those, consider it a full keyboard; do not test KEY_RESERVED, though */
180 if ((bitmask_key[0] & mask) == mask)
181 udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1");
184 static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test)
186 struct udev_device *pdev;
187 unsigned long bitmask_ev[NBITS(EV_MAX)];
188 unsigned long bitmask_abs[NBITS(ABS_MAX)];
189 unsigned long bitmask_key[NBITS(KEY_MAX)];
190 unsigned long bitmask_rel[NBITS(REL_MAX)];
192 /* walk up the parental chain until we find the real input device; the
193 * argument is very likely a subdevice of this, like eventN */
195 while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL)
196 pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
198 /* not an "input" class device */
202 /* Use this as a flag that input devices were detected, so that this
203 * program doesn't need to be called more than once per device */
204 udev_builtin_add_property(dev, test, "ID_INPUT", "1");
205 get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test);
206 get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test);
207 get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test);
208 get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test);
209 test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, test);
210 test_key(dev, bitmask_ev, bitmask_key, test);
214 const struct udev_builtin udev_builtin_input_id = {
216 .cmd = builtin_input_id,
217 .help = "input device properties",