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Commit | Line | Data |
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e7145211 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
d7867b31 | 2 | /* |
24447733 | 3 | * expose input properties via udev |
d7867b31 | 4 | * |
810adae9 | 5 | * Portions Copyright © 2004 David Zeuthen, <david@fubar.dk> |
810adae9 | 6 | * Copyright © 2014 Carlos Garnacho <carlosg@gnome.org> |
d7867b31 KS |
7 | */ |
8 | ||
07630cea LP |
9 | #include <errno.h> |
10 | #include <stdarg.h> | |
d7867b31 KS |
11 | #include <stdio.h> |
12 | #include <stdlib.h> | |
d7867b31 | 13 | #include <string.h> |
07630cea | 14 | #include <unistd.h> |
d7867b31 KS |
15 | #include <linux/limits.h> |
16 | #include <linux/input.h> | |
17 | ||
d9de38ca | 18 | #include "device-util.h" |
3ffd4af2 | 19 | #include "fd-util.h" |
ea7a562a | 20 | #include "missing.h" |
d054f0a4 | 21 | #include "stdio-util.h" |
07630cea | 22 | #include "string-util.h" |
07a26e42 | 23 | #include "udev-builtin.h" |
24447733 | 24 | #include "util.h" |
d7867b31 KS |
25 | |
26 | /* we must use this kernel-compatible implementation */ | |
27 | #define BITS_PER_LONG (sizeof(unsigned long) * 8) | |
28 | #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1) | |
29 | #define OFF(x) ((x)%BITS_PER_LONG) | |
30 | #define BIT(x) (1UL<<OFF(x)) | |
31 | #define LONG(x) ((x)/BITS_PER_LONG) | |
32 | #define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1) | |
33 | ||
f472d466 NL |
34 | struct range { |
35 | unsigned start; | |
36 | unsigned end; | |
37 | }; | |
38 | ||
39 | /* key code ranges above BTN_MISC (start is inclusive, stop is exclusive)*/ | |
40 | static const struct range high_key_blocks[] = { | |
41 | { KEY_OK, BTN_DPAD_UP }, | |
42 | { KEY_ALS_TOGGLE, BTN_TRIGGER_HAPPY } | |
43 | }; | |
44 | ||
24447733 DH |
45 | static inline int abs_size_mm(const struct input_absinfo *absinfo) { |
46 | /* Resolution is defined to be in units/mm for ABS_X/Y */ | |
47 | return (absinfo->maximum - absinfo->minimum) / absinfo->resolution; | |
48 | } | |
49 | ||
ff799927 | 50 | static void extract_info(sd_device *dev, const char *devpath, bool test) { |
24447733 DH |
51 | char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)]; |
52 | struct input_absinfo xabsinfo = {}, yabsinfo = {}; | |
53 | _cleanup_close_ int fd = -1; | |
54 | ||
55 | fd = open(devpath, O_RDONLY|O_CLOEXEC); | |
56 | if (fd < 0) | |
57 | return; | |
58 | ||
59 | if (ioctl(fd, EVIOCGABS(ABS_X), &xabsinfo) < 0 || | |
60 | ioctl(fd, EVIOCGABS(ABS_Y), &yabsinfo) < 0) | |
61 | return; | |
62 | ||
63 | if (xabsinfo.resolution <= 0 || yabsinfo.resolution <= 0) | |
64 | return; | |
65 | ||
d054f0a4 DM |
66 | xsprintf(width, "%d", abs_size_mm(&xabsinfo)); |
67 | xsprintf(height, "%d", abs_size_mm(&yabsinfo)); | |
24447733 | 68 | |
ff799927 YW |
69 | udev_builtin_add_property(dev, test, "ID_INPUT_WIDTH_MM", width); |
70 | udev_builtin_add_property(dev, test, "ID_INPUT_HEIGHT_MM", height); | |
24447733 DH |
71 | } |
72 | ||
d7867b31 KS |
73 | /* |
74 | * Read a capability attribute and return bitmask. | |
ff799927 | 75 | * @param dev sd_device |
d7867b31 KS |
76 | * @param attr sysfs attribute name (e. g. "capabilities/key") |
77 | * @param bitmask: Output array which has a sizeof of bitmask_size | |
78 | */ | |
d9de38ca | 79 | static void get_cap_mask(sd_device *pdev, const char* attr, |
912541b0 | 80 | unsigned long *bitmask, size_t bitmask_size, |
9ec6e95b | 81 | bool test) { |
975a9007 | 82 | const char *v; |
912541b0 KS |
83 | char text[4096]; |
84 | unsigned i; | |
85 | char* word; | |
86 | unsigned long val; | |
87 | ||
ff799927 YW |
88 | if (sd_device_get_sysattr_value(pdev, attr, &v) < 0) |
89 | v = ""; | |
975a9007 | 90 | |
d054f0a4 | 91 | xsprintf(text, "%s", v); |
d9de38ca | 92 | log_device_debug(pdev, "%s raw kernel attribute: %s", attr, text); |
912541b0 | 93 | |
29804cc1 | 94 | memzero(bitmask, bitmask_size); |
912541b0 KS |
95 | i = 0; |
96 | while ((word = strrchr(text, ' ')) != NULL) { | |
d9de38ca YW |
97 | val = strtoul(word+1, NULL, 16); |
98 | if (i < bitmask_size / sizeof(unsigned long)) | |
912541b0 KS |
99 | bitmask[i] = val; |
100 | else | |
d9de38ca | 101 | log_device_debug(pdev, "Ignoring %s block %lX which is larger than maximum size", attr, val); |
912541b0 KS |
102 | *word = '\0'; |
103 | ++i; | |
104 | } | |
105 | val = strtoul (text, NULL, 16); | |
106 | if (i < bitmask_size / sizeof(unsigned long)) | |
107 | bitmask[i] = val; | |
108 | else | |
d9de38ca | 109 | log_device_debug(pdev, "Ignoring %s block %lX which is larger than maximum size", attr, val); |
912541b0 KS |
110 | |
111 | if (test) { | |
112 | /* printf pattern with the right unsigned long number of hex chars */ | |
d054f0a4 DM |
113 | xsprintf(text, " bit %%4u: %%0%zulX\n", |
114 | 2 * sizeof(unsigned long)); | |
d9de38ca | 115 | log_device_debug(pdev, "%s decoded bit map:", attr); |
912541b0 KS |
116 | val = bitmask_size / sizeof (unsigned long); |
117 | /* skip over leading zeros */ | |
118 | while (bitmask[val-1] == 0 && val > 0) | |
119 | --val; | |
bcfce235 LP |
120 | for (i = 0; i < val; ++i) { |
121 | DISABLE_WARNING_FORMAT_NONLITERAL; | |
d9de38ca | 122 | log_device_debug(pdev, text, i * BITS_PER_LONG, bitmask[i]); |
bcfce235 LP |
123 | REENABLE_WARNING; |
124 | } | |
912541b0 | 125 | } |
d7867b31 KS |
126 | } |
127 | ||
128 | /* pointer devices */ | |
ff799927 | 129 | static bool test_pointers(sd_device *dev, |
b914418a PH |
130 | const unsigned long* bitmask_ev, |
131 | const unsigned long* bitmask_abs, | |
132 | const unsigned long* bitmask_key, | |
133 | const unsigned long* bitmask_rel, | |
134 | const unsigned long* bitmask_props, | |
135 | bool test) { | |
22811ad0 | 136 | int button, axis; |
15264e5a AP |
137 | bool has_abs_coordinates = false; |
138 | bool has_rel_coordinates = false; | |
fa5a113d | 139 | bool has_mt_coordinates = false; |
15264e5a | 140 | bool has_joystick_axes_or_buttons = false; |
fa5a113d | 141 | bool is_direct = false; |
15264e5a AP |
142 | bool has_touch = false; |
143 | bool has_3d_coordinates = false; | |
144 | bool has_keys = false; | |
145 | bool stylus_or_pen = false; | |
146 | bool finger_but_no_pen = false; | |
147 | bool has_mouse_button = false; | |
148 | bool is_mouse = false; | |
149 | bool is_touchpad = false; | |
150 | bool is_touchscreen = false; | |
151 | bool is_tablet = false; | |
152 | bool is_joystick = false; | |
153 | bool is_accelerometer = false; | |
154 | bool is_pointing_stick= false; | |
155 | ||
156 | has_keys = test_bit(EV_KEY, bitmask_ev); | |
157 | has_abs_coordinates = test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs); | |
158 | has_3d_coordinates = has_abs_coordinates && test_bit(ABS_Z, bitmask_abs); | |
159 | is_accelerometer = test_bit(INPUT_PROP_ACCELEROMETER, bitmask_props); | |
160 | ||
161 | if (!has_keys && has_3d_coordinates) | |
162 | is_accelerometer = true; | |
163 | ||
164 | if (is_accelerometer) { | |
ff799927 | 165 | udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1"); |
941a2aca | 166 | return true; |
bd1acc9f HG |
167 | } |
168 | ||
15264e5a AP |
169 | is_pointing_stick = test_bit(INPUT_PROP_POINTING_STICK, bitmask_props); |
170 | stylus_or_pen = test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key); | |
171 | finger_but_no_pen = test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key); | |
22811ad0 MS |
172 | for (button = BTN_MOUSE; button < BTN_JOYSTICK && !has_mouse_button; button++) |
173 | has_mouse_button = test_bit(button, bitmask_key); | |
15264e5a | 174 | has_rel_coordinates = test_bit(EV_REL, bitmask_ev) && test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel); |
fa5a113d | 175 | has_mt_coordinates = test_bit(ABS_MT_POSITION_X, bitmask_abs) && test_bit(ABS_MT_POSITION_Y, bitmask_abs); |
495968cf AP |
176 | |
177 | /* unset has_mt_coordinates if devices claims to have all abs axis */ | |
9ed794a3 | 178 | if (has_mt_coordinates && test_bit(ABS_MT_SLOT, bitmask_abs) && test_bit(ABS_MT_SLOT - 1, bitmask_abs)) |
495968cf | 179 | has_mt_coordinates = false; |
fa5a113d | 180 | is_direct = test_bit(INPUT_PROP_DIRECT, bitmask_props); |
15264e5a | 181 | has_touch = test_bit(BTN_TOUCH, bitmask_key); |
0cd6767c | 182 | |
15264e5a AP |
183 | /* joysticks don't necessarily have buttons; e. g. |
184 | * rudders/pedals are joystick-like, but buttonless; they have | |
0cd6767c PH |
185 | * other fancy axes. Others have buttons only but no axes. |
186 | * | |
187 | * The BTN_JOYSTICK range starts after the mouse range, so a mouse | |
188 | * with more than 16 buttons runs into the joystick range (e.g. Mad | |
189 | * Catz Mad Catz M.M.O.TE). Skip those. | |
190 | */ | |
191 | if (!test_bit(BTN_JOYSTICK - 1, bitmask_key)) { | |
192 | for (button = BTN_JOYSTICK; button < BTN_DIGI && !has_joystick_axes_or_buttons; button++) | |
193 | has_joystick_axes_or_buttons = test_bit(button, bitmask_key); | |
194 | for (button = BTN_TRIGGER_HAPPY1; button <= BTN_TRIGGER_HAPPY40 && !has_joystick_axes_or_buttons; button++) | |
195 | has_joystick_axes_or_buttons = test_bit(button, bitmask_key); | |
196 | for (button = BTN_DPAD_UP; button <= BTN_DPAD_RIGHT && !has_joystick_axes_or_buttons; button++) | |
197 | has_joystick_axes_or_buttons = test_bit(button, bitmask_key); | |
198 | } | |
22811ad0 MS |
199 | for (axis = ABS_RX; axis < ABS_PRESSURE && !has_joystick_axes_or_buttons; axis++) |
200 | has_joystick_axes_or_buttons = test_bit(axis, bitmask_abs); | |
15264e5a AP |
201 | |
202 | if (has_abs_coordinates) { | |
203 | if (stylus_or_pen) | |
204 | is_tablet = true; | |
fa5a113d | 205 | else if (finger_but_no_pen && !is_direct) |
15264e5a AP |
206 | is_touchpad = true; |
207 | else if (has_mouse_button) | |
912541b0 KS |
208 | /* This path is taken by VMware's USB mouse, which has |
209 | * absolute axes, but no touch/pressure button. */ | |
15264e5a | 210 | is_mouse = true; |
1a3439ef | 211 | else if (has_touch || is_direct) |
15264e5a AP |
212 | is_touchscreen = true; |
213 | else if (has_joystick_axes_or_buttons) | |
214 | is_joystick = true; | |
2e856c63 PH |
215 | } else if (has_joystick_axes_or_buttons) { |
216 | is_joystick = true; | |
912541b0 | 217 | } |
2e856c63 | 218 | |
d3a37494 AP |
219 | if (has_mt_coordinates) { |
220 | if (stylus_or_pen) | |
221 | is_tablet = true; | |
222 | else if (finger_but_no_pen && !is_direct) | |
223 | is_touchpad = true; | |
224 | else if (has_touch || is_direct) | |
225 | is_touchscreen = true; | |
226 | } | |
912541b0 | 227 | |
774ff9ba PH |
228 | if (!is_tablet && !is_touchpad && !is_joystick && |
229 | has_mouse_button && | |
0c21944e MS |
230 | (has_rel_coordinates || |
231 | !has_abs_coordinates)) /* mouse buttons and no axis */ | |
15264e5a | 232 | is_mouse = true; |
912541b0 | 233 | |
15264e5a | 234 | if (is_pointing_stick) |
ff799927 | 235 | udev_builtin_add_property(dev, test, "ID_INPUT_POINTINGSTICK", "1"); |
15264e5a | 236 | if (is_mouse) |
ff799927 | 237 | udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1"); |
15264e5a | 238 | if (is_touchpad) |
ff799927 | 239 | udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1"); |
15264e5a | 240 | if (is_touchscreen) |
ff799927 | 241 | udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1"); |
15264e5a | 242 | if (is_joystick) |
ff799927 | 243 | udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1"); |
15264e5a | 244 | if (is_tablet) |
ff799927 | 245 | udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1"); |
15264e5a AP |
246 | |
247 | return is_tablet || is_mouse || is_touchpad || is_touchscreen || is_joystick || is_pointing_stick; | |
d7867b31 KS |
248 | } |
249 | ||
250 | /* key like devices */ | |
ff799927 | 251 | static bool test_key(sd_device *dev, |
b914418a PH |
252 | const unsigned long* bitmask_ev, |
253 | const unsigned long* bitmask_key, | |
254 | bool test) { | |
912541b0 KS |
255 | unsigned i; |
256 | unsigned long found; | |
257 | unsigned long mask; | |
941a2aca | 258 | bool ret = false; |
912541b0 KS |
259 | |
260 | /* do we have any KEY_* capability? */ | |
b914418a | 261 | if (!test_bit(EV_KEY, bitmask_ev)) { |
d9de38ca | 262 | log_device_debug(dev, "test_key: no EV_KEY capability"); |
941a2aca | 263 | return false; |
912541b0 KS |
264 | } |
265 | ||
266 | /* only consider KEY_* here, not BTN_* */ | |
267 | found = 0; | |
268 | for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) { | |
269 | found |= bitmask_key[i]; | |
d9de38ca | 270 | log_device_debug(dev, "test_key: checking bit block %lu for any keys; found=%i", (unsigned long)i*BITS_PER_LONG, found > 0); |
912541b0 | 271 | } |
f472d466 | 272 | /* If there are no keys in the lower block, check the higher blocks */ |
912541b0 | 273 | if (!found) { |
f472d466 NL |
274 | unsigned block; |
275 | for (block = 0; block < (sizeof(high_key_blocks) / sizeof(struct range)); ++block) { | |
276 | for (i = high_key_blocks[block].start; i < high_key_blocks[block].end; ++i) { | |
277 | if (test_bit(i, bitmask_key)) { | |
d9de38ca | 278 | log_device_debug(dev, "test_key: Found key %x in high block", i); |
f472d466 NL |
279 | found = 1; |
280 | break; | |
281 | } | |
912541b0 KS |
282 | } |
283 | } | |
284 | } | |
285 | ||
941a2aca | 286 | if (found > 0) { |
ff799927 | 287 | udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1"); |
941a2aca HG |
288 | ret = true; |
289 | } | |
912541b0 KS |
290 | |
291 | /* the first 32 bits are ESC, numbers, and Q to D; if we have all of | |
292 | * those, consider it a full keyboard; do not test KEY_RESERVED, though */ | |
293 | mask = 0xFFFFFFFE; | |
d94a24ca | 294 | if (FLAGS_SET(bitmask_key[0], mask)) { |
ff799927 | 295 | udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1"); |
941a2aca HG |
296 | ret = true; |
297 | } | |
298 | ||
299 | return ret; | |
d7867b31 KS |
300 | } |
301 | ||
3fc2e9a2 YW |
302 | static int builtin_input_id(sd_device *dev, int argc, char *argv[], bool test) { |
303 | sd_device *pdev; | |
912541b0 KS |
304 | unsigned long bitmask_ev[NBITS(EV_MAX)]; |
305 | unsigned long bitmask_abs[NBITS(ABS_MAX)]; | |
306 | unsigned long bitmask_key[NBITS(KEY_MAX)]; | |
307 | unsigned long bitmask_rel[NBITS(REL_MAX)]; | |
606df97b | 308 | unsigned long bitmask_props[NBITS(INPUT_PROP_MAX)]; |
24447733 | 309 | const char *sysname, *devnode; |
37186823 HG |
310 | bool is_pointer; |
311 | bool is_key; | |
912541b0 | 312 | |
3b64e4d4 TG |
313 | assert(dev); |
314 | ||
912541b0 KS |
315 | /* walk up the parental chain until we find the real input device; the |
316 | * argument is very likely a subdevice of this, like eventN */ | |
ff799927 YW |
317 | for (pdev = dev; pdev; ) { |
318 | const char *s; | |
319 | ||
320 | if (sd_device_get_sysattr_value(pdev, "capabilities/ev", &s) >= 0) | |
321 | break; | |
322 | ||
323 | if (sd_device_get_parent_with_subsystem_devtype(pdev, "input", NULL, &pdev) >= 0) | |
324 | continue; | |
325 | ||
326 | pdev = NULL; | |
327 | break; | |
328 | } | |
912541b0 | 329 | |
24447733 DH |
330 | if (pdev) { |
331 | /* Use this as a flag that input devices were detected, so that this | |
332 | * program doesn't need to be called more than once per device */ | |
ff799927 | 333 | udev_builtin_add_property(dev, test, "ID_INPUT", "1"); |
d9de38ca YW |
334 | get_cap_mask(pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test); |
335 | get_cap_mask(pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test); | |
336 | get_cap_mask(pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test); | |
337 | get_cap_mask(pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test); | |
338 | get_cap_mask(pdev, "properties", bitmask_props, sizeof(bitmask_props), test); | |
37186823 HG |
339 | is_pointer = test_pointers(dev, bitmask_ev, bitmask_abs, |
340 | bitmask_key, bitmask_rel, | |
341 | bitmask_props, test); | |
342 | is_key = test_key(dev, bitmask_ev, bitmask_key, test); | |
343 | /* Some evdev nodes have only a scrollwheel */ | |
344 | if (!is_pointer && !is_key && test_bit(EV_REL, bitmask_ev) && | |
345 | (test_bit(REL_WHEEL, bitmask_rel) || test_bit(REL_HWHEEL, bitmask_rel))) | |
ff799927 | 346 | udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1"); |
64083a60 | 347 | if (test_bit(EV_SW, bitmask_ev)) |
ff799927 | 348 | udev_builtin_add_property(dev, test, "ID_INPUT_SWITCH", "1"); |
64083a60 | 349 | |
24447733 DH |
350 | } |
351 | ||
ff799927 YW |
352 | if (sd_device_get_devname(dev, &devnode) >= 0 && |
353 | sd_device_get_sysname(dev, &sysname) >= 0 && | |
354 | startswith(sysname, "event")) | |
24447733 DH |
355 | extract_info(dev, devnode, test); |
356 | ||
d354690e | 357 | return 0; |
d7867b31 KS |
358 | } |
359 | ||
360 | const struct udev_builtin udev_builtin_input_id = { | |
912541b0 KS |
361 | .name = "input_id", |
362 | .cmd = builtin_input_id, | |
5ac0162c | 363 | .help = "Input device properties", |
d7867b31 | 364 | }; |