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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * The input core | |
4 | * | |
5 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
6 | */ | |
7 | ||
1da177e4 | 8 | |
da0c4901 JP |
9 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt |
10 | ||
1da177e4 | 11 | #include <linux/init.h> |
ffd0db97 | 12 | #include <linux/types.h> |
7f8d4cad | 13 | #include <linux/idr.h> |
47c78e89 | 14 | #include <linux/input/mt.h> |
1da177e4 | 15 | #include <linux/module.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | #include <linux/random.h> |
18 | #include <linux/major.h> | |
19 | #include <linux/proc_fs.h> | |
a99bbaf5 | 20 | #include <linux/sched.h> |
969b21cd | 21 | #include <linux/seq_file.h> |
1da177e4 LT |
22 | #include <linux/poll.h> |
23 | #include <linux/device.h> | |
e676c232 | 24 | #include <linux/mutex.h> |
8006479c | 25 | #include <linux/rcupdate.h> |
15e184af | 26 | #include "input-compat.h" |
e95656ea | 27 | #include "input-poller.h" |
1da177e4 LT |
28 | |
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
30 | MODULE_DESCRIPTION("Input core"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
7f8d4cad DT |
33 | #define INPUT_MAX_CHAR_DEVICES 1024 |
34 | #define INPUT_FIRST_DYNAMIC_DEV 256 | |
35 | static DEFINE_IDA(input_ida); | |
1da177e4 LT |
36 | |
37 | static LIST_HEAD(input_dev_list); | |
38 | static LIST_HEAD(input_handler_list); | |
39 | ||
8006479c DT |
40 | /* |
41 | * input_mutex protects access to both input_dev_list and input_handler_list. | |
42 | * This also causes input_[un]register_device and input_[un]register_handler | |
43 | * be mutually exclusive which simplifies locking in drivers implementing | |
44 | * input handlers. | |
45 | */ | |
46 | static DEFINE_MUTEX(input_mutex); | |
47 | ||
4369c64c HR |
48 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; |
49 | ||
8006479c DT |
50 | static inline int is_event_supported(unsigned int code, |
51 | unsigned long *bm, unsigned int max) | |
1da177e4 | 52 | { |
8006479c DT |
53 | return code <= max && test_bit(code, bm); |
54 | } | |
1da177e4 | 55 | |
8006479c DT |
56 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
57 | { | |
58 | if (fuzz) { | |
59 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) | |
60 | return old_val; | |
1da177e4 | 61 | |
8006479c DT |
62 | if (value > old_val - fuzz && value < old_val + fuzz) |
63 | return (old_val * 3 + value) / 4; | |
1da177e4 | 64 | |
8006479c DT |
65 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
66 | return (old_val + value) / 2; | |
67 | } | |
1da177e4 | 68 | |
8006479c DT |
69 | return value; |
70 | } | |
1da177e4 | 71 | |
352ac4bd HR |
72 | static void input_start_autorepeat(struct input_dev *dev, int code) |
73 | { | |
74 | if (test_bit(EV_REP, dev->evbit) && | |
75 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
4e974c12 | 76 | dev->timer.function) { |
352ac4bd HR |
77 | dev->repeat_key = code; |
78 | mod_timer(&dev->timer, | |
79 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
80 | } | |
81 | } | |
82 | ||
83 | static void input_stop_autorepeat(struct input_dev *dev) | |
84 | { | |
85 | del_timer(&dev->timer); | |
86 | } | |
87 | ||
8006479c | 88 | /* |
ef7995f4 DT |
89 | * Pass event first through all filters and then, if event has not been |
90 | * filtered out, through all open handles. This function is called with | |
82ba56c2 | 91 | * dev->event_lock held and interrupts disabled. |
8006479c | 92 | */ |
4369c64c HR |
93 | static unsigned int input_to_handler(struct input_handle *handle, |
94 | struct input_value *vals, unsigned int count) | |
8006479c | 95 | { |
4369c64c HR |
96 | struct input_handler *handler = handle->handler; |
97 | struct input_value *end = vals; | |
98 | struct input_value *v; | |
82ba56c2 | 99 | |
2c50ad34 AG |
100 | if (handler->filter) { |
101 | for (v = vals; v != vals + count; v++) { | |
102 | if (handler->filter(handle, v->type, v->code, v->value)) | |
103 | continue; | |
104 | if (end != v) | |
105 | *end = *v; | |
106 | end++; | |
107 | } | |
108 | count = end - vals; | |
4369c64c | 109 | } |
1da177e4 | 110 | |
4369c64c HR |
111 | if (!count) |
112 | return 0; | |
ef7995f4 | 113 | |
4369c64c HR |
114 | if (handler->events) |
115 | handler->events(handle, vals, count); | |
116 | else if (handler->event) | |
2c50ad34 | 117 | for (v = vals; v != vals + count; v++) |
4369c64c | 118 | handler->event(handle, v->type, v->code, v->value); |
ef7995f4 | 119 | |
4369c64c HR |
120 | return count; |
121 | } | |
ef7995f4 | 122 | |
4369c64c HR |
123 | /* |
124 | * Pass values first through all filters and then, if event has not been | |
125 | * filtered out, through all open handles. This function is called with | |
126 | * dev->event_lock held and interrupts disabled. | |
127 | */ | |
128 | static void input_pass_values(struct input_dev *dev, | |
129 | struct input_value *vals, unsigned int count) | |
8006479c | 130 | { |
82ba56c2 | 131 | struct input_handle *handle; |
4369c64c | 132 | struct input_value *v; |
ef7995f4 | 133 | |
4369c64c HR |
134 | if (!count) |
135 | return; | |
82ba56c2 DT |
136 | |
137 | rcu_read_lock(); | |
1da177e4 | 138 | |
82ba56c2 | 139 | handle = rcu_dereference(dev->grab); |
4369c64c HR |
140 | if (handle) { |
141 | count = input_to_handler(handle, vals, count); | |
142 | } else { | |
143 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) | |
2c50ad34 | 144 | if (handle->open) { |
4369c64c | 145 | count = input_to_handler(handle, vals, count); |
2c50ad34 AG |
146 | if (!count) |
147 | break; | |
148 | } | |
ef7995f4 | 149 | } |
ef7995f4 | 150 | |
82ba56c2 | 151 | rcu_read_unlock(); |
ef7995f4 | 152 | |
352ac4bd | 153 | /* trigger auto repeat for key events */ |
5ab17145 AG |
154 | if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) { |
155 | for (v = vals; v != vals + count; v++) { | |
156 | if (v->type == EV_KEY && v->value != 2) { | |
157 | if (v->value) | |
158 | input_start_autorepeat(dev, v->code); | |
159 | else | |
160 | input_stop_autorepeat(dev); | |
161 | } | |
ef7995f4 DT |
162 | } |
163 | } | |
4369c64c | 164 | } |
ef7995f4 | 165 | |
4369c64c HR |
166 | static void input_pass_event(struct input_dev *dev, |
167 | unsigned int type, unsigned int code, int value) | |
168 | { | |
169 | struct input_value vals[] = { { type, code, value } }; | |
170 | ||
171 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); | |
8006479c | 172 | } |
1da177e4 | 173 | |
8006479c DT |
174 | /* |
175 | * Generate software autorepeat event. Note that we take | |
176 | * dev->event_lock here to avoid racing with input_event | |
177 | * which may cause keys get "stuck". | |
178 | */ | |
4e974c12 | 179 | static void input_repeat_key(struct timer_list *t) |
8006479c | 180 | { |
4e974c12 | 181 | struct input_dev *dev = from_timer(dev, t, timer); |
8006479c | 182 | unsigned long flags; |
1da177e4 | 183 | |
8006479c | 184 | spin_lock_irqsave(&dev->event_lock, flags); |
1da177e4 | 185 | |
8006479c DT |
186 | if (test_bit(dev->repeat_key, dev->key) && |
187 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
4369c64c HR |
188 | struct input_value vals[] = { |
189 | { EV_KEY, dev->repeat_key, 2 }, | |
190 | input_value_sync | |
191 | }; | |
1da177e4 | 192 | |
4134252a | 193 | input_set_timestamp(dev, ktime_get()); |
4369c64c | 194 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
31581066 | 195 | |
8006479c DT |
196 | if (dev->rep[REP_PERIOD]) |
197 | mod_timer(&dev->timer, jiffies + | |
198 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
199 | } | |
31581066 | 200 | |
8006479c DT |
201 | spin_unlock_irqrestore(&dev->event_lock, flags); |
202 | } | |
31581066 | 203 | |
8006479c DT |
204 | #define INPUT_IGNORE_EVENT 0 |
205 | #define INPUT_PASS_TO_HANDLERS 1 | |
206 | #define INPUT_PASS_TO_DEVICE 2 | |
4369c64c HR |
207 | #define INPUT_SLOT 4 |
208 | #define INPUT_FLUSH 8 | |
8006479c | 209 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) |
1da177e4 | 210 | |
40d007e7 HR |
211 | static int input_handle_abs_event(struct input_dev *dev, |
212 | unsigned int code, int *pval) | |
213 | { | |
8d18fba2 | 214 | struct input_mt *mt = dev->mt; |
40d007e7 HR |
215 | bool is_mt_event; |
216 | int *pold; | |
217 | ||
218 | if (code == ABS_MT_SLOT) { | |
219 | /* | |
220 | * "Stage" the event; we'll flush it later, when we | |
144c0f88 | 221 | * get actual touch data. |
40d007e7 | 222 | */ |
8d18fba2 HR |
223 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
224 | mt->slot = *pval; | |
40d007e7 HR |
225 | |
226 | return INPUT_IGNORE_EVENT; | |
227 | } | |
228 | ||
b89529a1 | 229 | is_mt_event = input_is_mt_value(code); |
40d007e7 HR |
230 | |
231 | if (!is_mt_event) { | |
d31b2865 | 232 | pold = &dev->absinfo[code].value; |
8d18fba2 HR |
233 | } else if (mt) { |
234 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; | |
40d007e7 HR |
235 | } else { |
236 | /* | |
144c0f88 | 237 | * Bypass filtering for multi-touch events when |
40d007e7 HR |
238 | * not employing slots. |
239 | */ | |
240 | pold = NULL; | |
241 | } | |
242 | ||
243 | if (pold) { | |
244 | *pval = input_defuzz_abs_event(*pval, *pold, | |
d31b2865 | 245 | dev->absinfo[code].fuzz); |
40d007e7 HR |
246 | if (*pold == *pval) |
247 | return INPUT_IGNORE_EVENT; | |
248 | ||
249 | *pold = *pval; | |
250 | } | |
251 | ||
252 | /* Flush pending "slot" event */ | |
8d18fba2 HR |
253 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
254 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); | |
4369c64c | 255 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; |
40d007e7 HR |
256 | } |
257 | ||
258 | return INPUT_PASS_TO_HANDLERS; | |
259 | } | |
260 | ||
4369c64c | 261 | static int input_get_disposition(struct input_dev *dev, |
50c5d36d | 262 | unsigned int type, unsigned int code, int *pval) |
8006479c DT |
263 | { |
264 | int disposition = INPUT_IGNORE_EVENT; | |
50c5d36d | 265 | int value = *pval; |
1da177e4 | 266 | |
8006479c | 267 | switch (type) { |
1da177e4 | 268 | |
8006479c DT |
269 | case EV_SYN: |
270 | switch (code) { | |
271 | case SYN_CONFIG: | |
272 | disposition = INPUT_PASS_TO_ALL; | |
273 | break; | |
1da177e4 | 274 | |
8006479c | 275 | case SYN_REPORT: |
4369c64c | 276 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; |
1da177e4 | 277 | break; |
5e5ee686 | 278 | case SYN_MT_REPORT: |
5e5ee686 HR |
279 | disposition = INPUT_PASS_TO_HANDLERS; |
280 | break; | |
8006479c DT |
281 | } |
282 | break; | |
1da177e4 | 283 | |
8006479c | 284 | case EV_KEY: |
0672120a | 285 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
1da177e4 | 286 | |
0672120a HR |
287 | /* auto-repeat bypasses state updates */ |
288 | if (value == 2) { | |
289 | disposition = INPUT_PASS_TO_HANDLERS; | |
290 | break; | |
8006479c | 291 | } |
1da177e4 | 292 | |
0672120a | 293 | if (!!test_bit(code, dev->key) != !!value) { |
1da177e4 | 294 | |
8006479c | 295 | __change_bit(code, dev->key); |
0672120a | 296 | disposition = INPUT_PASS_TO_HANDLERS; |
8006479c | 297 | } |
8006479c DT |
298 | } |
299 | break; | |
1da177e4 | 300 | |
8006479c DT |
301 | case EV_SW: |
302 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
0672120a | 303 | !!test_bit(code, dev->sw) != !!value) { |
1da177e4 | 304 | |
8006479c DT |
305 | __change_bit(code, dev->sw); |
306 | disposition = INPUT_PASS_TO_HANDLERS; | |
307 | } | |
308 | break; | |
1da177e4 | 309 | |
8006479c | 310 | case EV_ABS: |
40d007e7 | 311 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
9ae4345a | 312 | disposition = input_handle_abs_event(dev, code, &value); |
61994a61 | 313 | |
8006479c | 314 | break; |
1da177e4 | 315 | |
8006479c DT |
316 | case EV_REL: |
317 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
318 | disposition = INPUT_PASS_TO_HANDLERS; | |
1da177e4 | 319 | |
8006479c | 320 | break; |
1e0afb28 | 321 | |
8006479c DT |
322 | case EV_MSC: |
323 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
324 | disposition = INPUT_PASS_TO_ALL; | |
1da177e4 | 325 | |
8006479c | 326 | break; |
1da177e4 | 327 | |
8006479c DT |
328 | case EV_LED: |
329 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
0672120a | 330 | !!test_bit(code, dev->led) != !!value) { |
1da177e4 | 331 | |
8006479c DT |
332 | __change_bit(code, dev->led); |
333 | disposition = INPUT_PASS_TO_ALL; | |
334 | } | |
335 | break; | |
336 | ||
337 | case EV_SND: | |
338 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
1da177e4 | 339 | |
8fdc1948 | 340 | if (!!test_bit(code, dev->snd) != !!value) |
8006479c DT |
341 | __change_bit(code, dev->snd); |
342 | disposition = INPUT_PASS_TO_ALL; | |
343 | } | |
344 | break; | |
8fdc1948 | 345 | |
8006479c DT |
346 | case EV_REP: |
347 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
348 | dev->rep[code] = value; | |
349 | disposition = INPUT_PASS_TO_ALL; | |
350 | } | |
351 | break; | |
1da177e4 | 352 | |
8006479c DT |
353 | case EV_FF: |
354 | if (value >= 0) | |
355 | disposition = INPUT_PASS_TO_ALL; | |
356 | break; | |
ed2fa4dd RP |
357 | |
358 | case EV_PWR: | |
359 | disposition = INPUT_PASS_TO_ALL; | |
360 | break; | |
8006479c | 361 | } |
1da177e4 | 362 | |
50c5d36d | 363 | *pval = value; |
4369c64c HR |
364 | return disposition; |
365 | } | |
366 | ||
367 | static void input_handle_event(struct input_dev *dev, | |
368 | unsigned int type, unsigned int code, int value) | |
369 | { | |
b55eb298 | 370 | int disposition = input_get_disposition(dev, type, code, &value); |
4369c64c | 371 | |
b55eb298 DT |
372 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) |
373 | add_input_randomness(type, code, value); | |
1da177e4 | 374 | |
8006479c DT |
375 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
376 | dev->event(dev, type, code, value); | |
1da177e4 | 377 | |
4369c64c HR |
378 | if (!dev->vals) |
379 | return; | |
380 | ||
381 | if (disposition & INPUT_PASS_TO_HANDLERS) { | |
382 | struct input_value *v; | |
383 | ||
384 | if (disposition & INPUT_SLOT) { | |
385 | v = &dev->vals[dev->num_vals++]; | |
386 | v->type = EV_ABS; | |
387 | v->code = ABS_MT_SLOT; | |
388 | v->value = dev->mt->slot; | |
389 | } | |
390 | ||
391 | v = &dev->vals[dev->num_vals++]; | |
392 | v->type = type; | |
393 | v->code = code; | |
394 | v->value = value; | |
395 | } | |
396 | ||
397 | if (disposition & INPUT_FLUSH) { | |
398 | if (dev->num_vals >= 2) | |
399 | input_pass_values(dev, dev->vals, dev->num_vals); | |
400 | dev->num_vals = 0; | |
4370b231 DT |
401 | /* |
402 | * Reset the timestamp on flush so we won't end up | |
403 | * with a stale one. Note we only need to reset the | |
404 | * monolithic one as we use its presence when deciding | |
405 | * whether to generate a synthetic timestamp. | |
406 | */ | |
407 | dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0); | |
4369c64c HR |
408 | } else if (dev->num_vals >= dev->max_vals - 2) { |
409 | dev->vals[dev->num_vals++] = input_value_sync; | |
410 | input_pass_values(dev, dev->vals, dev->num_vals); | |
411 | dev->num_vals = 0; | |
412 | } | |
413 | ||
8006479c | 414 | } |
1da177e4 | 415 | |
8006479c DT |
416 | /** |
417 | * input_event() - report new input event | |
418 | * @dev: device that generated the event | |
419 | * @type: type of the event | |
420 | * @code: event code | |
421 | * @value: value of the event | |
422 | * | |
423 | * This function should be used by drivers implementing various input | |
df2d4637 DT |
424 | * devices to report input events. See also input_inject_event(). |
425 | * | |
426 | * NOTE: input_event() may be safely used right after input device was | |
427 | * allocated with input_allocate_device(), even before it is registered | |
428 | * with input_register_device(), but the event will not reach any of the | |
429 | * input handlers. Such early invocation of input_event() may be used | |
430 | * to 'seed' initial state of a switch or initial position of absolute | |
431 | * axis, etc. | |
8006479c | 432 | */ |
8006479c DT |
433 | void input_event(struct input_dev *dev, |
434 | unsigned int type, unsigned int code, int value) | |
435 | { | |
436 | unsigned long flags; | |
509ca1a9 | 437 | |
8006479c | 438 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
509ca1a9 | 439 | |
8006479c | 440 | spin_lock_irqsave(&dev->event_lock, flags); |
9ae4345a | 441 | input_handle_event(dev, type, code, value); |
8006479c | 442 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1da177e4 | 443 | } |
1da177e4 | 444 | } |
ca56fe07 | 445 | EXPORT_SYMBOL(input_event); |
1da177e4 | 446 | |
0e739d28 DT |
447 | /** |
448 | * input_inject_event() - send input event from input handler | |
449 | * @handle: input handle to send event through | |
450 | * @type: type of the event | |
451 | * @code: event code | |
452 | * @value: value of the event | |
453 | * | |
8006479c DT |
454 | * Similar to input_event() but will ignore event if device is |
455 | * "grabbed" and handle injecting event is not the one that owns | |
456 | * the device. | |
0e739d28 | 457 | */ |
8006479c DT |
458 | void input_inject_event(struct input_handle *handle, |
459 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 460 | { |
8006479c DT |
461 | struct input_dev *dev = handle->dev; |
462 | struct input_handle *grab; | |
463 | unsigned long flags; | |
1da177e4 | 464 | |
8006479c DT |
465 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
466 | spin_lock_irqsave(&dev->event_lock, flags); | |
1da177e4 | 467 | |
82ba56c2 | 468 | rcu_read_lock(); |
8006479c DT |
469 | grab = rcu_dereference(dev->grab); |
470 | if (!grab || grab == handle) | |
9ae4345a | 471 | input_handle_event(dev, type, code, value); |
82ba56c2 | 472 | rcu_read_unlock(); |
1da177e4 | 473 | |
8006479c DT |
474 | spin_unlock_irqrestore(&dev->event_lock, flags); |
475 | } | |
1da177e4 | 476 | } |
8006479c | 477 | EXPORT_SYMBOL(input_inject_event); |
1da177e4 | 478 | |
d31b2865 DM |
479 | /** |
480 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
481 | * @dev: the input device emitting absolute events | |
482 | * | |
483 | * If the absinfo struct the caller asked for is already allocated, this | |
484 | * functions will not do anything. | |
485 | */ | |
486 | void input_alloc_absinfo(struct input_dev *dev) | |
487 | { | |
100294ce DT |
488 | if (dev->absinfo) |
489 | return; | |
d31b2865 | 490 | |
100294ce DT |
491 | dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL); |
492 | if (!dev->absinfo) { | |
493 | dev_err(dev->dev.parent ?: &dev->dev, | |
494 | "%s: unable to allocate memory\n", __func__); | |
495 | /* | |
496 | * We will handle this allocation failure in | |
497 | * input_register_device() when we refuse to register input | |
498 | * device with ABS bits but without absinfo. | |
499 | */ | |
500 | } | |
d31b2865 DM |
501 | } |
502 | EXPORT_SYMBOL(input_alloc_absinfo); | |
503 | ||
504 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
505 | int min, int max, int fuzz, int flat) | |
506 | { | |
507 | struct input_absinfo *absinfo; | |
508 | ||
509 | input_alloc_absinfo(dev); | |
510 | if (!dev->absinfo) | |
511 | return; | |
512 | ||
513 | absinfo = &dev->absinfo[axis]; | |
514 | absinfo->minimum = min; | |
515 | absinfo->maximum = max; | |
516 | absinfo->fuzz = fuzz; | |
517 | absinfo->flat = flat; | |
518 | ||
2c9a9cfe DT |
519 | __set_bit(EV_ABS, dev->evbit); |
520 | __set_bit(axis, dev->absbit); | |
d31b2865 DM |
521 | } |
522 | EXPORT_SYMBOL(input_set_abs_params); | |
523 | ||
524 | ||
8006479c DT |
525 | /** |
526 | * input_grab_device - grabs device for exclusive use | |
527 | * @handle: input handle that wants to own the device | |
528 | * | |
529 | * When a device is grabbed by an input handle all events generated by | |
530 | * the device are delivered only to this handle. Also events injected | |
531 | * by other input handles are ignored while device is grabbed. | |
532 | */ | |
1da177e4 LT |
533 | int input_grab_device(struct input_handle *handle) |
534 | { | |
8006479c DT |
535 | struct input_dev *dev = handle->dev; |
536 | int retval; | |
1da177e4 | 537 | |
8006479c DT |
538 | retval = mutex_lock_interruptible(&dev->mutex); |
539 | if (retval) | |
540 | return retval; | |
541 | ||
542 | if (dev->grab) { | |
543 | retval = -EBUSY; | |
544 | goto out; | |
545 | } | |
546 | ||
547 | rcu_assign_pointer(dev->grab, handle); | |
8006479c DT |
548 | |
549 | out: | |
550 | mutex_unlock(&dev->mutex); | |
551 | return retval; | |
1da177e4 | 552 | } |
ca56fe07 | 553 | EXPORT_SYMBOL(input_grab_device); |
1da177e4 | 554 | |
8006479c | 555 | static void __input_release_device(struct input_handle *handle) |
1da177e4 | 556 | { |
a2b2ed2c | 557 | struct input_dev *dev = handle->dev; |
adc4633c | 558 | struct input_handle *grabber; |
c7e8dc6e | 559 | |
adc4633c DT |
560 | grabber = rcu_dereference_protected(dev->grab, |
561 | lockdep_is_held(&dev->mutex)); | |
562 | if (grabber == handle) { | |
8006479c DT |
563 | rcu_assign_pointer(dev->grab, NULL); |
564 | /* Make sure input_pass_event() notices that grab is gone */ | |
82ba56c2 | 565 | synchronize_rcu(); |
a2b2ed2c AM |
566 | |
567 | list_for_each_entry(handle, &dev->h_list, d_node) | |
8006479c | 568 | if (handle->open && handle->handler->start) |
c7e8dc6e DT |
569 | handle->handler->start(handle); |
570 | } | |
1da177e4 | 571 | } |
8006479c DT |
572 | |
573 | /** | |
574 | * input_release_device - release previously grabbed device | |
575 | * @handle: input handle that owns the device | |
576 | * | |
577 | * Releases previously grabbed device so that other input handles can | |
578 | * start receiving input events. Upon release all handlers attached | |
579 | * to the device have their start() method called so they have a change | |
580 | * to synchronize device state with the rest of the system. | |
581 | */ | |
582 | void input_release_device(struct input_handle *handle) | |
583 | { | |
584 | struct input_dev *dev = handle->dev; | |
585 | ||
586 | mutex_lock(&dev->mutex); | |
587 | __input_release_device(handle); | |
588 | mutex_unlock(&dev->mutex); | |
589 | } | |
ca56fe07 | 590 | EXPORT_SYMBOL(input_release_device); |
1da177e4 | 591 | |
8006479c DT |
592 | /** |
593 | * input_open_device - open input device | |
594 | * @handle: handle through which device is being accessed | |
595 | * | |
596 | * This function should be called by input handlers when they | |
597 | * want to start receive events from given input device. | |
598 | */ | |
1da177e4 LT |
599 | int input_open_device(struct input_handle *handle) |
600 | { | |
0fbf87ca | 601 | struct input_dev *dev = handle->dev; |
8006479c | 602 | int retval; |
0fbf87ca | 603 | |
8006479c DT |
604 | retval = mutex_lock_interruptible(&dev->mutex); |
605 | if (retval) | |
606 | return retval; | |
607 | ||
608 | if (dev->going_away) { | |
609 | retval = -ENODEV; | |
610 | goto out; | |
611 | } | |
0fbf87ca | 612 | |
1da177e4 | 613 | handle->open++; |
0fbf87ca | 614 | |
e95656ea DT |
615 | if (dev->users++) { |
616 | /* | |
617 | * Device is already opened, so we can exit immediately and | |
618 | * report success. | |
619 | */ | |
620 | goto out; | |
621 | } | |
8006479c | 622 | |
e95656ea DT |
623 | if (dev->open) { |
624 | retval = dev->open(dev); | |
625 | if (retval) { | |
626 | dev->users--; | |
627 | handle->open--; | |
8006479c DT |
628 | /* |
629 | * Make sure we are not delivering any more events | |
630 | * through this handle | |
631 | */ | |
82ba56c2 | 632 | synchronize_rcu(); |
e95656ea | 633 | goto out; |
8006479c DT |
634 | } |
635 | } | |
0fbf87ca | 636 | |
e95656ea DT |
637 | if (dev->poller) |
638 | input_dev_poller_start(dev->poller); | |
639 | ||
8006479c | 640 | out: |
e676c232 | 641 | mutex_unlock(&dev->mutex); |
8006479c | 642 | return retval; |
1da177e4 | 643 | } |
ca56fe07 | 644 | EXPORT_SYMBOL(input_open_device); |
1da177e4 | 645 | |
8006479c | 646 | int input_flush_device(struct input_handle *handle, struct file *file) |
1da177e4 | 647 | { |
8006479c DT |
648 | struct input_dev *dev = handle->dev; |
649 | int retval; | |
1da177e4 | 650 | |
8006479c DT |
651 | retval = mutex_lock_interruptible(&dev->mutex); |
652 | if (retval) | |
653 | return retval; | |
654 | ||
655 | if (dev->flush) | |
656 | retval = dev->flush(dev, file); | |
657 | ||
658 | mutex_unlock(&dev->mutex); | |
659 | return retval; | |
1da177e4 | 660 | } |
ca56fe07 | 661 | EXPORT_SYMBOL(input_flush_device); |
1da177e4 | 662 | |
8006479c DT |
663 | /** |
664 | * input_close_device - close input device | |
665 | * @handle: handle through which device is being accessed | |
666 | * | |
667 | * This function should be called by input handlers when they | |
668 | * want to stop receive events from given input device. | |
669 | */ | |
1da177e4 LT |
670 | void input_close_device(struct input_handle *handle) |
671 | { | |
0fbf87ca DT |
672 | struct input_dev *dev = handle->dev; |
673 | ||
e676c232 | 674 | mutex_lock(&dev->mutex); |
0fbf87ca | 675 | |
8006479c DT |
676 | __input_release_device(handle); |
677 | ||
e95656ea DT |
678 | if (!--dev->users) { |
679 | if (dev->poller) | |
680 | input_dev_poller_stop(dev->poller); | |
681 | ||
682 | if (dev->close) | |
683 | dev->close(dev); | |
684 | } | |
8006479c DT |
685 | |
686 | if (!--handle->open) { | |
687 | /* | |
82ba56c2 | 688 | * synchronize_rcu() makes sure that input_pass_event() |
8006479c DT |
689 | * completed and that no more input events are delivered |
690 | * through this handle | |
691 | */ | |
82ba56c2 | 692 | synchronize_rcu(); |
8006479c | 693 | } |
0fbf87ca | 694 | |
e676c232 | 695 | mutex_unlock(&dev->mutex); |
1da177e4 | 696 | } |
ca56fe07 | 697 | EXPORT_SYMBOL(input_close_device); |
1da177e4 | 698 | |
866d7d7b ON |
699 | /* |
700 | * Simulate keyup events for all keys that are marked as pressed. | |
701 | * The function must be called with dev->event_lock held. | |
702 | */ | |
703 | static void input_dev_release_keys(struct input_dev *dev) | |
704 | { | |
00159f19 | 705 | bool need_sync = false; |
866d7d7b ON |
706 | int code; |
707 | ||
708 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
00159f19 | 709 | for_each_set_bit(code, dev->key, KEY_CNT) { |
3e2b03da | 710 | input_pass_event(dev, EV_KEY, code, 0); |
00159f19 DT |
711 | need_sync = true; |
712 | } | |
713 | ||
714 | if (need_sync) | |
715 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
716 | ||
3e2b03da | 717 | memset(dev->key, 0, sizeof(dev->key)); |
866d7d7b ON |
718 | } |
719 | } | |
720 | ||
8006479c DT |
721 | /* |
722 | * Prepare device for unregistering | |
723 | */ | |
724 | static void input_disconnect_device(struct input_dev *dev) | |
725 | { | |
726 | struct input_handle *handle; | |
8006479c DT |
727 | |
728 | /* | |
729 | * Mark device as going away. Note that we take dev->mutex here | |
730 | * not to protect access to dev->going_away but rather to ensure | |
731 | * that there are no threads in the middle of input_open_device() | |
732 | */ | |
733 | mutex_lock(&dev->mutex); | |
ffd0db97 | 734 | dev->going_away = true; |
8006479c DT |
735 | mutex_unlock(&dev->mutex); |
736 | ||
737 | spin_lock_irq(&dev->event_lock); | |
738 | ||
739 | /* | |
740 | * Simulate keyup events for all pressed keys so that handlers | |
741 | * are not left with "stuck" keys. The driver may continue | |
742 | * generate events even after we done here but they will not | |
743 | * reach any handlers. | |
744 | */ | |
866d7d7b | 745 | input_dev_release_keys(dev); |
8006479c DT |
746 | |
747 | list_for_each_entry(handle, &dev->h_list, d_node) | |
748 | handle->open = 0; | |
749 | ||
750 | spin_unlock_irq(&dev->event_lock); | |
751 | } | |
752 | ||
8613e4c2 MCC |
753 | /** |
754 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
755 | * @ke: keymap entry containing scancode to be converted. | |
756 | * @scancode: pointer to the location where converted scancode should | |
757 | * be stored. | |
758 | * | |
759 | * This function is used to convert scancode stored in &struct keymap_entry | |
760 | * into scalar form understood by legacy keymap handling methods. These | |
761 | * methods expect scancodes to be represented as 'unsigned int'. | |
762 | */ | |
763 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
764 | unsigned int *scancode) | |
765 | { | |
766 | switch (ke->len) { | |
767 | case 1: | |
768 | *scancode = *((u8 *)ke->scancode); | |
769 | break; | |
770 | ||
771 | case 2: | |
772 | *scancode = *((u16 *)ke->scancode); | |
773 | break; | |
774 | ||
775 | case 4: | |
776 | *scancode = *((u32 *)ke->scancode); | |
777 | break; | |
778 | ||
779 | default: | |
780 | return -EINVAL; | |
781 | } | |
782 | ||
783 | return 0; | |
784 | } | |
785 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
786 | ||
787 | /* | |
788 | * Those routines handle the default case where no [gs]etkeycode() is | |
789 | * defined. In this case, an array indexed by the scancode is used. | |
790 | */ | |
791 | ||
792 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
793 | unsigned int index) | |
c8e4c772 MR |
794 | { |
795 | switch (dev->keycodesize) { | |
8613e4c2 MCC |
796 | case 1: |
797 | return ((u8 *)dev->keycode)[index]; | |
c8e4c772 | 798 | |
8613e4c2 MCC |
799 | case 2: |
800 | return ((u16 *)dev->keycode)[index]; | |
c8e4c772 | 801 | |
8613e4c2 MCC |
802 | default: |
803 | return ((u32 *)dev->keycode)[index]; | |
c8e4c772 MR |
804 | } |
805 | } | |
806 | ||
807 | static int input_default_getkeycode(struct input_dev *dev, | |
8613e4c2 | 808 | struct input_keymap_entry *ke) |
c8e4c772 | 809 | { |
8613e4c2 MCC |
810 | unsigned int index; |
811 | int error; | |
812 | ||
c8e4c772 MR |
813 | if (!dev->keycodesize) |
814 | return -EINVAL; | |
815 | ||
8613e4c2 MCC |
816 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
817 | index = ke->index; | |
818 | else { | |
819 | error = input_scancode_to_scalar(ke, &index); | |
820 | if (error) | |
821 | return error; | |
822 | } | |
823 | ||
824 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
825 | return -EINVAL; |
826 | ||
8613e4c2 MCC |
827 | ke->keycode = input_fetch_keycode(dev, index); |
828 | ke->index = index; | |
829 | ke->len = sizeof(index); | |
830 | memcpy(ke->scancode, &index, sizeof(index)); | |
c8e4c772 MR |
831 | |
832 | return 0; | |
833 | } | |
834 | ||
835 | static int input_default_setkeycode(struct input_dev *dev, | |
8613e4c2 MCC |
836 | const struct input_keymap_entry *ke, |
837 | unsigned int *old_keycode) | |
c8e4c772 | 838 | { |
8613e4c2 MCC |
839 | unsigned int index; |
840 | int error; | |
c8e4c772 MR |
841 | int i; |
842 | ||
8613e4c2 | 843 | if (!dev->keycodesize) |
c8e4c772 MR |
844 | return -EINVAL; |
845 | ||
8613e4c2 MCC |
846 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
847 | index = ke->index; | |
848 | } else { | |
849 | error = input_scancode_to_scalar(ke, &index); | |
850 | if (error) | |
851 | return error; | |
852 | } | |
853 | ||
854 | if (index >= dev->keycodemax) | |
c8e4c772 MR |
855 | return -EINVAL; |
856 | ||
de391d12 | 857 | if (dev->keycodesize < sizeof(ke->keycode) && |
8613e4c2 | 858 | (ke->keycode >> (dev->keycodesize * 8))) |
c8e4c772 MR |
859 | return -EINVAL; |
860 | ||
861 | switch (dev->keycodesize) { | |
862 | case 1: { | |
863 | u8 *k = (u8 *)dev->keycode; | |
8613e4c2 MCC |
864 | *old_keycode = k[index]; |
865 | k[index] = ke->keycode; | |
c8e4c772 MR |
866 | break; |
867 | } | |
868 | case 2: { | |
869 | u16 *k = (u16 *)dev->keycode; | |
8613e4c2 MCC |
870 | *old_keycode = k[index]; |
871 | k[index] = ke->keycode; | |
c8e4c772 MR |
872 | break; |
873 | } | |
874 | default: { | |
875 | u32 *k = (u32 *)dev->keycode; | |
8613e4c2 MCC |
876 | *old_keycode = k[index]; |
877 | k[index] = ke->keycode; | |
c8e4c772 MR |
878 | break; |
879 | } | |
880 | } | |
881 | ||
cb222aed DT |
882 | if (*old_keycode <= KEY_MAX) { |
883 | __clear_bit(*old_keycode, dev->keybit); | |
884 | for (i = 0; i < dev->keycodemax; i++) { | |
885 | if (input_fetch_keycode(dev, i) == *old_keycode) { | |
886 | __set_bit(*old_keycode, dev->keybit); | |
887 | /* Setting the bit twice is useless, so break */ | |
888 | break; | |
889 | } | |
c8e4c772 MR |
890 | } |
891 | } | |
892 | ||
cb222aed | 893 | __set_bit(ke->keycode, dev->keybit); |
c8e4c772 MR |
894 | return 0; |
895 | } | |
896 | ||
f4f37c8e DT |
897 | /** |
898 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
899 | * @dev: input device which keymap is being queried | |
8613e4c2 | 900 | * @ke: keymap entry |
f4f37c8e DT |
901 | * |
902 | * This function should be called by anyone interested in retrieving current | |
8613e4c2 | 903 | * keymap. Presently evdev handlers use it. |
f4f37c8e | 904 | */ |
8613e4c2 | 905 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
f4f37c8e | 906 | { |
2e2e3b96 DT |
907 | unsigned long flags; |
908 | int retval; | |
909 | ||
910 | spin_lock_irqsave(&dev->event_lock, flags); | |
aebd636b | 911 | retval = dev->getkeycode(dev, ke); |
8613e4c2 | 912 | spin_unlock_irqrestore(&dev->event_lock, flags); |
aebd636b | 913 | |
2e2e3b96 | 914 | return retval; |
f4f37c8e DT |
915 | } |
916 | EXPORT_SYMBOL(input_get_keycode); | |
917 | ||
918 | /** | |
8613e4c2 | 919 | * input_set_keycode - attribute a keycode to a given scancode |
f4f37c8e | 920 | * @dev: input device which keymap is being updated |
8613e4c2 | 921 | * @ke: new keymap entry |
f4f37c8e DT |
922 | * |
923 | * This function should be called by anyone needing to update current | |
924 | * keymap. Presently keyboard and evdev handlers use it. | |
925 | */ | |
58b93995 | 926 | int input_set_keycode(struct input_dev *dev, |
8613e4c2 | 927 | const struct input_keymap_entry *ke) |
f4f37c8e DT |
928 | { |
929 | unsigned long flags; | |
fd6cf3dd | 930 | unsigned int old_keycode; |
f4f37c8e DT |
931 | int retval; |
932 | ||
8613e4c2 | 933 | if (ke->keycode > KEY_MAX) |
f4f37c8e DT |
934 | return -EINVAL; |
935 | ||
936 | spin_lock_irqsave(&dev->event_lock, flags); | |
937 | ||
aebd636b | 938 | retval = dev->setkeycode(dev, ke, &old_keycode); |
f4f37c8e DT |
939 | if (retval) |
940 | goto out; | |
941 | ||
4f93df40 DT |
942 | /* Make sure KEY_RESERVED did not get enabled. */ |
943 | __clear_bit(KEY_RESERVED, dev->keybit); | |
944 | ||
f4f37c8e DT |
945 | /* |
946 | * Simulate keyup event if keycode is not present | |
947 | * in the keymap anymore | |
948 | */ | |
cb222aed DT |
949 | if (old_keycode > KEY_MAX) { |
950 | dev_warn(dev->dev.parent ?: &dev->dev, | |
951 | "%s: got too big old keycode %#x\n", | |
952 | __func__, old_keycode); | |
953 | } else if (test_bit(EV_KEY, dev->evbit) && | |
954 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
955 | __test_and_clear_bit(old_keycode, dev->key)) { | |
4369c64c HR |
956 | struct input_value vals[] = { |
957 | { EV_KEY, old_keycode, 0 }, | |
958 | input_value_sync | |
959 | }; | |
f4f37c8e | 960 | |
4369c64c | 961 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
f4f37c8e DT |
962 | } |
963 | ||
964 | out: | |
965 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
966 | ||
967 | return retval; | |
968 | } | |
969 | EXPORT_SYMBOL(input_set_keycode); | |
c8e4c772 | 970 | |
55dfce87 DT |
971 | bool input_match_device_id(const struct input_dev *dev, |
972 | const struct input_device_id *id) | |
973 | { | |
974 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
975 | if (id->bustype != dev->id.bustype) | |
976 | return false; | |
977 | ||
978 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
979 | if (id->vendor != dev->id.vendor) | |
980 | return false; | |
981 | ||
982 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
983 | if (id->product != dev->id.product) | |
984 | return false; | |
985 | ||
986 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
987 | if (id->version != dev->id.version) | |
988 | return false; | |
989 | ||
990 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) || | |
991 | !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) || | |
992 | !bitmap_subset(id->relbit, dev->relbit, REL_MAX) || | |
993 | !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) || | |
994 | !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) || | |
995 | !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) || | |
996 | !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) || | |
997 | !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) || | |
8724ecb0 DT |
998 | !bitmap_subset(id->swbit, dev->swbit, SW_MAX) || |
999 | !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) { | |
55dfce87 DT |
1000 | return false; |
1001 | } | |
1002 | ||
1003 | return true; | |
1004 | } | |
1005 | EXPORT_SYMBOL(input_match_device_id); | |
1006 | ||
0b7024ac | 1007 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
66e66118 | 1008 | struct input_dev *dev) |
1da177e4 | 1009 | { |
0b7024ac | 1010 | const struct input_device_id *id; |
1da177e4 | 1011 | |
0b7024ac | 1012 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
55dfce87 DT |
1013 | if (input_match_device_id(dev, id) && |
1014 | (!handler->match || handler->match(handler, dev))) { | |
0b7024ac | 1015 | return id; |
55dfce87 | 1016 | } |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | return NULL; | |
1020 | } | |
1021 | ||
5b2a0826 DT |
1022 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
1023 | { | |
1024 | const struct input_device_id *id; | |
1025 | int error; | |
1026 | ||
0b7024ac | 1027 | id = input_match_device(handler, dev); |
5b2a0826 DT |
1028 | if (!id) |
1029 | return -ENODEV; | |
1030 | ||
1031 | error = handler->connect(handler, dev, id); | |
1032 | if (error && error != -ENODEV) | |
da0c4901 JP |
1033 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
1034 | handler->name, kobject_name(&dev->dev.kobj), error); | |
5b2a0826 DT |
1035 | |
1036 | return error; | |
1037 | } | |
1038 | ||
15e184af DT |
1039 | #ifdef CONFIG_COMPAT |
1040 | ||
1041 | static int input_bits_to_string(char *buf, int buf_size, | |
1042 | unsigned long bits, bool skip_empty) | |
1043 | { | |
1044 | int len = 0; | |
1045 | ||
b8b4ead1 | 1046 | if (in_compat_syscall()) { |
15e184af DT |
1047 | u32 dword = bits >> 32; |
1048 | if (dword || !skip_empty) | |
1049 | len += snprintf(buf, buf_size, "%x ", dword); | |
1050 | ||
1051 | dword = bits & 0xffffffffUL; | |
1052 | if (dword || !skip_empty || len) | |
1053 | len += snprintf(buf + len, max(buf_size - len, 0), | |
1054 | "%x", dword); | |
1055 | } else { | |
1056 | if (bits || !skip_empty) | |
1057 | len += snprintf(buf, buf_size, "%lx", bits); | |
1058 | } | |
1059 | ||
1060 | return len; | |
1061 | } | |
1062 | ||
1063 | #else /* !CONFIG_COMPAT */ | |
1064 | ||
1065 | static int input_bits_to_string(char *buf, int buf_size, | |
1066 | unsigned long bits, bool skip_empty) | |
1067 | { | |
1068 | return bits || !skip_empty ? | |
1069 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
1070 | } | |
1071 | ||
1072 | #endif | |
5b2a0826 | 1073 | |
f96b434d DT |
1074 | #ifdef CONFIG_PROC_FS |
1075 | ||
1076 | static struct proc_dir_entry *proc_bus_input_dir; | |
1077 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
1078 | static int input_devices_state; | |
1079 | ||
1080 | static inline void input_wakeup_procfs_readers(void) | |
1081 | { | |
1082 | input_devices_state++; | |
1083 | wake_up(&input_devices_poll_wait); | |
1084 | } | |
1085 | ||
afc9a42b | 1086 | static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait) |
f96b434d | 1087 | { |
f96b434d | 1088 | poll_wait(file, &input_devices_poll_wait, wait); |
fa886612 DT |
1089 | if (file->f_version != input_devices_state) { |
1090 | file->f_version = input_devices_state; | |
a9a08845 | 1091 | return EPOLLIN | EPOLLRDNORM; |
fa886612 | 1092 | } |
1e0afb28 | 1093 | |
f96b434d DT |
1094 | return 0; |
1095 | } | |
1096 | ||
1572ca2a DT |
1097 | union input_seq_state { |
1098 | struct { | |
1099 | unsigned short pos; | |
1100 | bool mutex_acquired; | |
1101 | }; | |
1102 | void *p; | |
1103 | }; | |
1104 | ||
969b21cd DT |
1105 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1106 | { | |
1572ca2a DT |
1107 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1108 | int error; | |
1109 | ||
1110 | /* We need to fit into seq->private pointer */ | |
1111 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1112 | ||
1113 | error = mutex_lock_interruptible(&input_mutex); | |
1114 | if (error) { | |
1115 | state->mutex_acquired = false; | |
1116 | return ERR_PTR(error); | |
1117 | } | |
1118 | ||
1119 | state->mutex_acquired = true; | |
f96b434d | 1120 | |
ad5d972c | 1121 | return seq_list_start(&input_dev_list, *pos); |
969b21cd | 1122 | } |
051b2fea | 1123 | |
969b21cd DT |
1124 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1125 | { | |
ad5d972c | 1126 | return seq_list_next(v, &input_dev_list, pos); |
969b21cd | 1127 | } |
f96b434d | 1128 | |
1572ca2a | 1129 | static void input_seq_stop(struct seq_file *seq, void *v) |
969b21cd | 1130 | { |
1572ca2a DT |
1131 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1132 | ||
1133 | if (state->mutex_acquired) | |
1134 | mutex_unlock(&input_mutex); | |
969b21cd | 1135 | } |
f96b434d | 1136 | |
969b21cd DT |
1137 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1138 | unsigned long *bitmap, int max) | |
1139 | { | |
1140 | int i; | |
15e184af DT |
1141 | bool skip_empty = true; |
1142 | char buf[18]; | |
f96b434d | 1143 | |
969b21cd | 1144 | seq_printf(seq, "B: %s=", name); |
15e184af DT |
1145 | |
1146 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1147 | if (input_bits_to_string(buf, sizeof(buf), | |
1148 | bitmap[i], skip_empty)) { | |
1149 | skip_empty = false; | |
1150 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * If no output was produced print a single 0. | |
1156 | */ | |
1157 | if (skip_empty) | |
bb546136 | 1158 | seq_putc(seq, '0'); |
15e184af | 1159 | |
969b21cd DT |
1160 | seq_putc(seq, '\n'); |
1161 | } | |
f96b434d | 1162 | |
969b21cd DT |
1163 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1164 | { | |
1165 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
9657d75c | 1166 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
969b21cd DT |
1167 | struct input_handle *handle; |
1168 | ||
1169 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1170 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1171 | ||
1172 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1173 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1174 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
15e03ae8 | 1175 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
63c95765 | 1176 | seq_puts(seq, "H: Handlers="); |
969b21cd DT |
1177 | |
1178 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1179 | seq_printf(seq, "%s ", handle->name); | |
1180 | seq_putc(seq, '\n'); | |
1181 | ||
85b77200 HR |
1182 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1183 | ||
969b21cd DT |
1184 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1185 | if (test_bit(EV_KEY, dev->evbit)) | |
1186 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1187 | if (test_bit(EV_REL, dev->evbit)) | |
1188 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1189 | if (test_bit(EV_ABS, dev->evbit)) | |
1190 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1191 | if (test_bit(EV_MSC, dev->evbit)) | |
1192 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1193 | if (test_bit(EV_LED, dev->evbit)) | |
1194 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1195 | if (test_bit(EV_SND, dev->evbit)) | |
1196 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1197 | if (test_bit(EV_FF, dev->evbit)) | |
1198 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1199 | if (test_bit(EV_SW, dev->evbit)) | |
1200 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1201 | ||
1202 | seq_putc(seq, '\n'); | |
1203 | ||
1204 | kfree(path); | |
1205 | return 0; | |
f96b434d DT |
1206 | } |
1207 | ||
cec69c37 | 1208 | static const struct seq_operations input_devices_seq_ops = { |
969b21cd DT |
1209 | .start = input_devices_seq_start, |
1210 | .next = input_devices_seq_next, | |
1572ca2a | 1211 | .stop = input_seq_stop, |
969b21cd DT |
1212 | .show = input_devices_seq_show, |
1213 | }; | |
1214 | ||
1215 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
f96b434d | 1216 | { |
969b21cd DT |
1217 | return seq_open(file, &input_devices_seq_ops); |
1218 | } | |
1219 | ||
97a32539 AD |
1220 | static const struct proc_ops input_devices_proc_ops = { |
1221 | .proc_open = input_proc_devices_open, | |
1222 | .proc_poll = input_proc_devices_poll, | |
1223 | .proc_read = seq_read, | |
1224 | .proc_lseek = seq_lseek, | |
1225 | .proc_release = seq_release, | |
969b21cd DT |
1226 | }; |
1227 | ||
1228 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1229 | { | |
1572ca2a DT |
1230 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1231 | int error; | |
1232 | ||
1233 | /* We need to fit into seq->private pointer */ | |
1234 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1235 | ||
1236 | error = mutex_lock_interruptible(&input_mutex); | |
1237 | if (error) { | |
1238 | state->mutex_acquired = false; | |
1239 | return ERR_PTR(error); | |
1240 | } | |
1241 | ||
1242 | state->mutex_acquired = true; | |
1243 | state->pos = *pos; | |
8006479c | 1244 | |
ad5d972c | 1245 | return seq_list_start(&input_handler_list, *pos); |
969b21cd | 1246 | } |
f96b434d | 1247 | |
969b21cd DT |
1248 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1249 | { | |
1572ca2a | 1250 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
f96b434d | 1251 | |
1572ca2a DT |
1252 | state->pos = *pos + 1; |
1253 | return seq_list_next(v, &input_handler_list, pos); | |
969b21cd DT |
1254 | } |
1255 | ||
1256 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1257 | { | |
1258 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1572ca2a | 1259 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
969b21cd | 1260 | |
1572ca2a | 1261 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
ef7995f4 DT |
1262 | if (handler->filter) |
1263 | seq_puts(seq, " (filter)"); | |
7f8d4cad | 1264 | if (handler->legacy_minors) |
969b21cd DT |
1265 | seq_printf(seq, " Minor=%d", handler->minor); |
1266 | seq_putc(seq, '\n'); | |
1267 | ||
1268 | return 0; | |
1269 | } | |
1572ca2a | 1270 | |
cec69c37 | 1271 | static const struct seq_operations input_handlers_seq_ops = { |
969b21cd DT |
1272 | .start = input_handlers_seq_start, |
1273 | .next = input_handlers_seq_next, | |
1572ca2a | 1274 | .stop = input_seq_stop, |
969b21cd DT |
1275 | .show = input_handlers_seq_show, |
1276 | }; | |
1277 | ||
1278 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1279 | { | |
1280 | return seq_open(file, &input_handlers_seq_ops); | |
1281 | } | |
1282 | ||
97a32539 AD |
1283 | static const struct proc_ops input_handlers_proc_ops = { |
1284 | .proc_open = input_proc_handlers_open, | |
1285 | .proc_read = seq_read, | |
1286 | .proc_lseek = seq_lseek, | |
1287 | .proc_release = seq_release, | |
969b21cd | 1288 | }; |
f96b434d DT |
1289 | |
1290 | static int __init input_proc_init(void) | |
1291 | { | |
1292 | struct proc_dir_entry *entry; | |
1293 | ||
9c37066d | 1294 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
f96b434d DT |
1295 | if (!proc_bus_input_dir) |
1296 | return -ENOMEM; | |
1297 | ||
c7705f34 | 1298 | entry = proc_create("devices", 0, proc_bus_input_dir, |
97a32539 | 1299 | &input_devices_proc_ops); |
f96b434d DT |
1300 | if (!entry) |
1301 | goto fail1; | |
1302 | ||
c7705f34 | 1303 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
97a32539 | 1304 | &input_handlers_proc_ops); |
f96b434d DT |
1305 | if (!entry) |
1306 | goto fail2; | |
1307 | ||
f96b434d DT |
1308 | return 0; |
1309 | ||
1310 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
9c37066d | 1311 | fail1: remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1312 | return -ENOMEM; |
1313 | } | |
1314 | ||
beffbdc2 | 1315 | static void input_proc_exit(void) |
f96b434d DT |
1316 | { |
1317 | remove_proc_entry("devices", proc_bus_input_dir); | |
1318 | remove_proc_entry("handlers", proc_bus_input_dir); | |
9c37066d | 1319 | remove_proc_entry("bus/input", NULL); |
f96b434d DT |
1320 | } |
1321 | ||
1322 | #else /* !CONFIG_PROC_FS */ | |
1323 | static inline void input_wakeup_procfs_readers(void) { } | |
1324 | static inline int input_proc_init(void) { return 0; } | |
1325 | static inline void input_proc_exit(void) { } | |
1326 | #endif | |
1327 | ||
9657d75c DT |
1328 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1329 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1330 | struct device_attribute *attr, \ | |
1331 | char *buf) \ | |
1332 | { \ | |
1333 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1334 | \ | |
1335 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1336 | input_dev->name ? input_dev->name : ""); \ | |
1337 | } \ | |
1338 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
5c1e9a6a DT |
1339 | |
1340 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1341 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1342 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1343 | ||
ac648a6a DT |
1344 | static int input_print_modalias_bits(char *buf, int size, |
1345 | char name, unsigned long *bm, | |
1346 | unsigned int min_bit, unsigned int max_bit) | |
1d8f430c | 1347 | { |
ac648a6a | 1348 | int len = 0, i; |
1d8f430c | 1349 | |
ac648a6a DT |
1350 | len += snprintf(buf, max(size, 0), "%c", name); |
1351 | for (i = min_bit; i < max_bit; i++) | |
7b19ada2 | 1352 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
ac648a6a | 1353 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1d8f430c RR |
1354 | return len; |
1355 | } | |
1356 | ||
2db66876 DT |
1357 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1358 | int add_cr) | |
1d8f430c | 1359 | { |
bd37e5a9 | 1360 | int len; |
1d8f430c | 1361 | |
ac648a6a DT |
1362 | len = snprintf(buf, max(size, 0), |
1363 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1364 | id->id.bustype, id->id.vendor, | |
1365 | id->id.product, id->id.version); | |
1366 | ||
1367 | len += input_print_modalias_bits(buf + len, size - len, | |
1368 | 'e', id->evbit, 0, EV_MAX); | |
1369 | len += input_print_modalias_bits(buf + len, size - len, | |
1370 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1371 | len += input_print_modalias_bits(buf + len, size - len, | |
1372 | 'r', id->relbit, 0, REL_MAX); | |
1373 | len += input_print_modalias_bits(buf + len, size - len, | |
1374 | 'a', id->absbit, 0, ABS_MAX); | |
1375 | len += input_print_modalias_bits(buf + len, size - len, | |
1376 | 'm', id->mscbit, 0, MSC_MAX); | |
1377 | len += input_print_modalias_bits(buf + len, size - len, | |
1378 | 'l', id->ledbit, 0, LED_MAX); | |
1379 | len += input_print_modalias_bits(buf + len, size - len, | |
1380 | 's', id->sndbit, 0, SND_MAX); | |
1381 | len += input_print_modalias_bits(buf + len, size - len, | |
1382 | 'f', id->ffbit, 0, FF_MAX); | |
1383 | len += input_print_modalias_bits(buf + len, size - len, | |
1384 | 'w', id->swbit, 0, SW_MAX); | |
2db66876 DT |
1385 | |
1386 | if (add_cr) | |
ac648a6a | 1387 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
2db66876 | 1388 | |
bd37e5a9 KS |
1389 | return len; |
1390 | } | |
1391 | ||
9657d75c DT |
1392 | static ssize_t input_dev_show_modalias(struct device *dev, |
1393 | struct device_attribute *attr, | |
1394 | char *buf) | |
bd37e5a9 KS |
1395 | { |
1396 | struct input_dev *id = to_input_dev(dev); | |
1397 | ssize_t len; | |
1398 | ||
2db66876 DT |
1399 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1400 | ||
8a3cf456 | 1401 | return min_t(int, len, PAGE_SIZE); |
1d8f430c | 1402 | } |
9657d75c | 1403 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1d8f430c | 1404 | |
85b77200 HR |
1405 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1406 | int max, int add_cr); | |
1407 | ||
1408 | static ssize_t input_dev_show_properties(struct device *dev, | |
1409 | struct device_attribute *attr, | |
1410 | char *buf) | |
1411 | { | |
1412 | struct input_dev *input_dev = to_input_dev(dev); | |
1413 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1414 | INPUT_PROP_MAX, true); | |
1415 | return min_t(int, len, PAGE_SIZE); | |
1416 | } | |
1417 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1418 | ||
629b77a4 | 1419 | static struct attribute *input_dev_attrs[] = { |
9657d75c DT |
1420 | &dev_attr_name.attr, |
1421 | &dev_attr_phys.attr, | |
1422 | &dev_attr_uniq.attr, | |
1423 | &dev_attr_modalias.attr, | |
85b77200 | 1424 | &dev_attr_properties.attr, |
629b77a4 GKH |
1425 | NULL |
1426 | }; | |
1427 | ||
5e895b74 | 1428 | static const struct attribute_group input_dev_attr_group = { |
629b77a4 | 1429 | .attrs = input_dev_attrs, |
5c1e9a6a DT |
1430 | }; |
1431 | ||
9657d75c DT |
1432 | #define INPUT_DEV_ID_ATTR(name) \ |
1433 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1434 | struct device_attribute *attr, \ | |
1435 | char *buf) \ | |
1436 | { \ | |
1437 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1438 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1439 | } \ | |
1440 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
5c1e9a6a DT |
1441 | |
1442 | INPUT_DEV_ID_ATTR(bustype); | |
1443 | INPUT_DEV_ID_ATTR(vendor); | |
1444 | INPUT_DEV_ID_ATTR(product); | |
1445 | INPUT_DEV_ID_ATTR(version); | |
1446 | ||
1447 | static struct attribute *input_dev_id_attrs[] = { | |
9657d75c DT |
1448 | &dev_attr_bustype.attr, |
1449 | &dev_attr_vendor.attr, | |
1450 | &dev_attr_product.attr, | |
1451 | &dev_attr_version.attr, | |
5c1e9a6a DT |
1452 | NULL |
1453 | }; | |
1454 | ||
5e895b74 | 1455 | static const struct attribute_group input_dev_id_attr_group = { |
5c1e9a6a DT |
1456 | .name = "id", |
1457 | .attrs = input_dev_id_attrs, | |
1458 | }; | |
1459 | ||
969b21cd DT |
1460 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1461 | int max, int add_cr) | |
1462 | { | |
1463 | int i; | |
1464 | int len = 0; | |
15e184af DT |
1465 | bool skip_empty = true; |
1466 | ||
1467 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1468 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1469 | bitmap[i], skip_empty); | |
1470 | if (len) { | |
1471 | skip_empty = false; | |
1472 | if (i > 0) | |
1473 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1474 | } | |
1475 | } | |
969b21cd | 1476 | |
15e184af DT |
1477 | /* |
1478 | * If no output was produced print a single 0. | |
1479 | */ | |
1480 | if (len == 0) | |
1481 | len = snprintf(buf, buf_size, "%d", 0); | |
969b21cd DT |
1482 | |
1483 | if (add_cr) | |
1484 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1485 | ||
1486 | return len; | |
1487 | } | |
1488 | ||
9657d75c DT |
1489 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1490 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1491 | struct device_attribute *attr, \ | |
1492 | char *buf) \ | |
1493 | { \ | |
1494 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1495 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
15e184af DT |
1496 | input_dev->bm##bit, ev##_MAX, \ |
1497 | true); \ | |
9657d75c DT |
1498 | return min_t(int, len, PAGE_SIZE); \ |
1499 | } \ | |
1500 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
5c1e9a6a DT |
1501 | |
1502 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1503 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1504 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1505 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1506 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1507 | INPUT_DEV_CAP_ATTR(LED, led); | |
1508 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1509 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1510 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1511 | ||
1512 | static struct attribute *input_dev_caps_attrs[] = { | |
9657d75c DT |
1513 | &dev_attr_ev.attr, |
1514 | &dev_attr_key.attr, | |
1515 | &dev_attr_rel.attr, | |
1516 | &dev_attr_abs.attr, | |
1517 | &dev_attr_msc.attr, | |
1518 | &dev_attr_led.attr, | |
1519 | &dev_attr_snd.attr, | |
1520 | &dev_attr_ff.attr, | |
1521 | &dev_attr_sw.attr, | |
5c1e9a6a DT |
1522 | NULL |
1523 | }; | |
1524 | ||
5e895b74 | 1525 | static const struct attribute_group input_dev_caps_attr_group = { |
5c1e9a6a DT |
1526 | .name = "capabilities", |
1527 | .attrs = input_dev_caps_attrs, | |
1528 | }; | |
1529 | ||
a4dbd674 | 1530 | static const struct attribute_group *input_dev_attr_groups[] = { |
cb9def4d DT |
1531 | &input_dev_attr_group, |
1532 | &input_dev_id_attr_group, | |
1533 | &input_dev_caps_attr_group, | |
e95656ea | 1534 | &input_poller_attribute_group, |
cb9def4d DT |
1535 | NULL |
1536 | }; | |
1537 | ||
9657d75c | 1538 | static void input_dev_release(struct device *device) |
d19fbe8a | 1539 | { |
9657d75c | 1540 | struct input_dev *dev = to_input_dev(device); |
d19fbe8a | 1541 | |
509ca1a9 | 1542 | input_ff_destroy(dev); |
40d007e7 | 1543 | input_mt_destroy_slots(dev); |
e95656ea | 1544 | kfree(dev->poller); |
d31b2865 | 1545 | kfree(dev->absinfo); |
4369c64c | 1546 | kfree(dev->vals); |
d19fbe8a | 1547 | kfree(dev); |
509ca1a9 | 1548 | |
d19fbe8a DT |
1549 | module_put(THIS_MODULE); |
1550 | } | |
1551 | ||
a7fadbe1 | 1552 | /* |
312c004d | 1553 | * Input uevent interface - loading event handlers based on |
a7fadbe1 DT |
1554 | * device bitfields. |
1555 | */ | |
7eff2e7a | 1556 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
ac648a6a | 1557 | const char *name, unsigned long *bitmap, int max) |
a7fadbe1 | 1558 | { |
7eff2e7a | 1559 | int len; |
a7fadbe1 | 1560 | |
fcd3027a | 1561 | if (add_uevent_var(env, "%s", name)) |
a7fadbe1 DT |
1562 | return -ENOMEM; |
1563 | ||
7eff2e7a KS |
1564 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1565 | sizeof(env->buf) - env->buflen, | |
15e184af | 1566 | bitmap, max, false); |
7eff2e7a | 1567 | if (len >= (sizeof(env->buf) - env->buflen)) |
a7fadbe1 DT |
1568 | return -ENOMEM; |
1569 | ||
7eff2e7a | 1570 | env->buflen += len; |
a7fadbe1 DT |
1571 | return 0; |
1572 | } | |
1573 | ||
7eff2e7a | 1574 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
ac648a6a DT |
1575 | struct input_dev *dev) |
1576 | { | |
7eff2e7a | 1577 | int len; |
ac648a6a | 1578 | |
7eff2e7a | 1579 | if (add_uevent_var(env, "MODALIAS=")) |
ac648a6a DT |
1580 | return -ENOMEM; |
1581 | ||
7eff2e7a KS |
1582 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1583 | sizeof(env->buf) - env->buflen, | |
1584 | dev, 0); | |
1585 | if (len >= (sizeof(env->buf) - env->buflen)) | |
ac648a6a DT |
1586 | return -ENOMEM; |
1587 | ||
7eff2e7a | 1588 | env->buflen += len; |
ac648a6a DT |
1589 | return 0; |
1590 | } | |
1591 | ||
a7fadbe1 DT |
1592 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1593 | do { \ | |
7eff2e7a | 1594 | int err = add_uevent_var(env, fmt, val); \ |
a7fadbe1 DT |
1595 | if (err) \ |
1596 | return err; \ | |
1597 | } while (0) | |
1598 | ||
1599 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1600 | do { \ | |
7eff2e7a | 1601 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
a7fadbe1 DT |
1602 | if (err) \ |
1603 | return err; \ | |
1604 | } while (0) | |
1605 | ||
ac648a6a DT |
1606 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1607 | do { \ | |
7eff2e7a | 1608 | int err = input_add_uevent_modalias_var(env, dev); \ |
ac648a6a DT |
1609 | if (err) \ |
1610 | return err; \ | |
1611 | } while (0) | |
1612 | ||
7eff2e7a | 1613 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
a7fadbe1 | 1614 | { |
9657d75c | 1615 | struct input_dev *dev = to_input_dev(device); |
a7fadbe1 DT |
1616 | |
1617 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1618 | dev->id.bustype, dev->id.vendor, | |
1619 | dev->id.product, dev->id.version); | |
1620 | if (dev->name) | |
1621 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1622 | if (dev->phys) | |
1623 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
08de1f04 | 1624 | if (dev->uniq) |
a7fadbe1 DT |
1625 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1626 | ||
85b77200 HR |
1627 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1628 | ||
a7fadbe1 DT |
1629 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1630 | if (test_bit(EV_KEY, dev->evbit)) | |
1631 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1632 | if (test_bit(EV_REL, dev->evbit)) | |
1633 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1634 | if (test_bit(EV_ABS, dev->evbit)) | |
1635 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1636 | if (test_bit(EV_MSC, dev->evbit)) | |
1637 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1638 | if (test_bit(EV_LED, dev->evbit)) | |
1639 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1640 | if (test_bit(EV_SND, dev->evbit)) | |
1641 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1642 | if (test_bit(EV_FF, dev->evbit)) | |
1643 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1644 | if (test_bit(EV_SW, dev->evbit)) | |
1645 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1646 | ||
ac648a6a | 1647 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
a7fadbe1 DT |
1648 | |
1649 | return 0; | |
1650 | } | |
1651 | ||
3cc96351 DT |
1652 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1653 | do { \ | |
1654 | int i; \ | |
1655 | bool active; \ | |
1656 | \ | |
1657 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1658 | break; \ | |
1659 | \ | |
3e2b03da | 1660 | for_each_set_bit(i, dev->bits##bit, type##_CNT) { \ |
3cc96351 DT |
1661 | active = test_bit(i, dev->bits); \ |
1662 | if (!active && !on) \ | |
1663 | continue; \ | |
1664 | \ | |
1665 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1666 | } \ | |
ffd0db97 DT |
1667 | } while (0) |
1668 | ||
b50b5216 | 1669 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
ffd0db97 DT |
1670 | { |
1671 | if (!dev->event) | |
1672 | return; | |
1673 | ||
1674 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1675 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1676 | ||
1677 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1678 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1679 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1680 | } | |
1681 | } | |
1682 | ||
b50b5216 DT |
1683 | /** |
1684 | * input_reset_device() - reset/restore the state of input device | |
1685 | * @dev: input device whose state needs to be reset | |
1686 | * | |
1687 | * This function tries to reset the state of an opened input device and | |
1688 | * bring internal state and state if the hardware in sync with each other. | |
1689 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1690 | */ | |
1691 | void input_reset_device(struct input_dev *dev) | |
1692 | { | |
768d9aa5 | 1693 | unsigned long flags; |
b50b5216 | 1694 | |
768d9aa5 AM |
1695 | mutex_lock(&dev->mutex); |
1696 | spin_lock_irqsave(&dev->event_lock, flags); | |
b50b5216 | 1697 | |
768d9aa5 AM |
1698 | input_dev_toggle(dev, true); |
1699 | input_dev_release_keys(dev); | |
b50b5216 | 1700 | |
768d9aa5 | 1701 | spin_unlock_irqrestore(&dev->event_lock, flags); |
b50b5216 DT |
1702 | mutex_unlock(&dev->mutex); |
1703 | } | |
1704 | EXPORT_SYMBOL(input_reset_device); | |
1705 | ||
768d9aa5 | 1706 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1707 | static int input_dev_suspend(struct device *dev) |
1708 | { | |
1709 | struct input_dev *input_dev = to_input_dev(dev); | |
1710 | ||
768d9aa5 | 1711 | spin_lock_irq(&input_dev->event_lock); |
b50b5216 | 1712 | |
768d9aa5 AM |
1713 | /* |
1714 | * Keys that are pressed now are unlikely to be | |
1715 | * still pressed when we resume. | |
1716 | */ | |
1717 | input_dev_release_keys(input_dev); | |
b50b5216 | 1718 | |
768d9aa5 AM |
1719 | /* Turn off LEDs and sounds, if any are active. */ |
1720 | input_dev_toggle(input_dev, false); | |
1721 | ||
1722 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1723 | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | static int input_dev_resume(struct device *dev) | |
1728 | { | |
1729 | struct input_dev *input_dev = to_input_dev(dev); | |
1730 | ||
768d9aa5 AM |
1731 | spin_lock_irq(&input_dev->event_lock); |
1732 | ||
1733 | /* Restore state of LEDs and sounds, if any were active. */ | |
1734 | input_dev_toggle(input_dev, true); | |
1735 | ||
1736 | spin_unlock_irq(&input_dev->event_lock); | |
1737 | ||
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | static int input_dev_freeze(struct device *dev) | |
1742 | { | |
1743 | struct input_dev *input_dev = to_input_dev(dev); | |
1744 | ||
1745 | spin_lock_irq(&input_dev->event_lock); | |
1746 | ||
1747 | /* | |
1748 | * Keys that are pressed now are unlikely to be | |
1749 | * still pressed when we resume. | |
1750 | */ | |
1751 | input_dev_release_keys(input_dev); | |
1752 | ||
1753 | spin_unlock_irq(&input_dev->event_lock); | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | static int input_dev_poweroff(struct device *dev) | |
1759 | { | |
1760 | struct input_dev *input_dev = to_input_dev(dev); | |
1761 | ||
1762 | spin_lock_irq(&input_dev->event_lock); | |
1763 | ||
1764 | /* Turn off LEDs and sounds, if any are active. */ | |
1765 | input_dev_toggle(input_dev, false); | |
1766 | ||
1767 | spin_unlock_irq(&input_dev->event_lock); | |
ffd0db97 DT |
1768 | |
1769 | return 0; | |
1770 | } | |
1771 | ||
1772 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1773 | .suspend = input_dev_suspend, | |
1774 | .resume = input_dev_resume, | |
768d9aa5 AM |
1775 | .freeze = input_dev_freeze, |
1776 | .poweroff = input_dev_poweroff, | |
ffd0db97 DT |
1777 | .restore = input_dev_resume, |
1778 | }; | |
1779 | #endif /* CONFIG_PM */ | |
1780 | ||
f719315b | 1781 | static const struct device_type input_dev_type = { |
9657d75c DT |
1782 | .groups = input_dev_attr_groups, |
1783 | .release = input_dev_release, | |
1784 | .uevent = input_dev_uevent, | |
768d9aa5 | 1785 | #ifdef CONFIG_PM_SLEEP |
ffd0db97 DT |
1786 | .pm = &input_dev_pm_ops, |
1787 | #endif | |
9657d75c DT |
1788 | }; |
1789 | ||
2c9ede55 | 1790 | static char *input_devnode(struct device *dev, umode_t *mode) |
aa5ed63e KS |
1791 | { |
1792 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1793 | } | |
1794 | ||
ea9f240b | 1795 | struct class input_class = { |
9657d75c | 1796 | .name = "input", |
e454cea2 | 1797 | .devnode = input_devnode, |
d19fbe8a | 1798 | }; |
ca56fe07 | 1799 | EXPORT_SYMBOL_GPL(input_class); |
d19fbe8a | 1800 | |
1447190e DT |
1801 | /** |
1802 | * input_allocate_device - allocate memory for new input device | |
1803 | * | |
2be975c6 | 1804 | * Returns prepared struct input_dev or %NULL. |
1447190e DT |
1805 | * |
1806 | * NOTE: Use input_free_device() to free devices that have not been | |
1807 | * registered; input_unregister_device() should be used for already | |
1808 | * registered devices. | |
1809 | */ | |
d19fbe8a DT |
1810 | struct input_dev *input_allocate_device(void) |
1811 | { | |
9c7d66fa | 1812 | static atomic_t input_no = ATOMIC_INIT(-1); |
d19fbe8a DT |
1813 | struct input_dev *dev; |
1814 | ||
c3f6f861 | 1815 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
d19fbe8a | 1816 | if (dev) { |
9657d75c DT |
1817 | dev->dev.type = &input_dev_type; |
1818 | dev->dev.class = &input_class; | |
1819 | device_initialize(&dev->dev); | |
f60d2b11 | 1820 | mutex_init(&dev->mutex); |
8006479c | 1821 | spin_lock_init(&dev->event_lock); |
4e974c12 | 1822 | timer_setup(&dev->timer, NULL, 0); |
d19fbe8a DT |
1823 | INIT_LIST_HEAD(&dev->h_list); |
1824 | INIT_LIST_HEAD(&dev->node); | |
655816e4 | 1825 | |
bf1d50fa | 1826 | dev_set_name(&dev->dev, "input%lu", |
9c7d66fa | 1827 | (unsigned long)atomic_inc_return(&input_no)); |
a60a71b0 | 1828 | |
655816e4 | 1829 | __module_get(THIS_MODULE); |
d19fbe8a DT |
1830 | } |
1831 | ||
1832 | return dev; | |
1833 | } | |
ca56fe07 | 1834 | EXPORT_SYMBOL(input_allocate_device); |
d19fbe8a | 1835 | |
2be975c6 DT |
1836 | struct input_devres { |
1837 | struct input_dev *input; | |
1838 | }; | |
1839 | ||
1840 | static int devm_input_device_match(struct device *dev, void *res, void *data) | |
1841 | { | |
1842 | struct input_devres *devres = res; | |
1843 | ||
1844 | return devres->input == data; | |
1845 | } | |
1846 | ||
1847 | static void devm_input_device_release(struct device *dev, void *res) | |
1848 | { | |
1849 | struct input_devres *devres = res; | |
1850 | struct input_dev *input = devres->input; | |
1851 | ||
1852 | dev_dbg(dev, "%s: dropping reference to %s\n", | |
1853 | __func__, dev_name(&input->dev)); | |
1854 | input_put_device(input); | |
1855 | } | |
1856 | ||
1857 | /** | |
1858 | * devm_input_allocate_device - allocate managed input device | |
1859 | * @dev: device owning the input device being created | |
1860 | * | |
1861 | * Returns prepared struct input_dev or %NULL. | |
1862 | * | |
1863 | * Managed input devices do not need to be explicitly unregistered or | |
1864 | * freed as it will be done automatically when owner device unbinds from | |
1865 | * its driver (or binding fails). Once managed input device is allocated, | |
1866 | * it is ready to be set up and registered in the same fashion as regular | |
1867 | * input device. There are no special devm_input_device_[un]register() | |
b666263b DT |
1868 | * variants, regular ones work with both managed and unmanaged devices, |
1869 | * should you need them. In most cases however, managed input device need | |
1870 | * not be explicitly unregistered or freed. | |
2be975c6 DT |
1871 | * |
1872 | * NOTE: the owner device is set up as parent of input device and users | |
1873 | * should not override it. | |
1874 | */ | |
2be975c6 DT |
1875 | struct input_dev *devm_input_allocate_device(struct device *dev) |
1876 | { | |
1877 | struct input_dev *input; | |
1878 | struct input_devres *devres; | |
1879 | ||
1880 | devres = devres_alloc(devm_input_device_release, | |
c3f6f861 | 1881 | sizeof(*devres), GFP_KERNEL); |
2be975c6 DT |
1882 | if (!devres) |
1883 | return NULL; | |
1884 | ||
1885 | input = input_allocate_device(); | |
1886 | if (!input) { | |
1887 | devres_free(devres); | |
1888 | return NULL; | |
1889 | } | |
1890 | ||
1891 | input->dev.parent = dev; | |
1892 | input->devres_managed = true; | |
1893 | ||
1894 | devres->input = input; | |
1895 | devres_add(dev, devres); | |
1896 | ||
1897 | return input; | |
1898 | } | |
1899 | EXPORT_SYMBOL(devm_input_allocate_device); | |
1900 | ||
1447190e DT |
1901 | /** |
1902 | * input_free_device - free memory occupied by input_dev structure | |
1903 | * @dev: input device to free | |
1904 | * | |
1905 | * This function should only be used if input_register_device() | |
1906 | * was not called yet or if it failed. Once device was registered | |
1907 | * use input_unregister_device() and memory will be freed once last | |
8006479c | 1908 | * reference to the device is dropped. |
1447190e DT |
1909 | * |
1910 | * Device should be allocated by input_allocate_device(). | |
1911 | * | |
1912 | * NOTE: If there are references to the input device then memory | |
1913 | * will not be freed until last reference is dropped. | |
1914 | */ | |
f60d2b11 DT |
1915 | void input_free_device(struct input_dev *dev) |
1916 | { | |
2be975c6 DT |
1917 | if (dev) { |
1918 | if (dev->devres_managed) | |
1919 | WARN_ON(devres_destroy(dev->dev.parent, | |
1920 | devm_input_device_release, | |
1921 | devm_input_device_match, | |
1922 | dev)); | |
f60d2b11 | 1923 | input_put_device(dev); |
2be975c6 | 1924 | } |
f60d2b11 | 1925 | } |
ca56fe07 | 1926 | EXPORT_SYMBOL(input_free_device); |
f60d2b11 | 1927 | |
3b51c44b AN |
1928 | /** |
1929 | * input_set_timestamp - set timestamp for input events | |
1930 | * @dev: input device to set timestamp for | |
1931 | * @timestamp: the time at which the event has occurred | |
1932 | * in CLOCK_MONOTONIC | |
1933 | * | |
1934 | * This function is intended to provide to the input system a more | |
1935 | * accurate time of when an event actually occurred. The driver should | |
1936 | * call this function as soon as a timestamp is acquired ensuring | |
1937 | * clock conversions in input_set_timestamp are done correctly. | |
1938 | * | |
1939 | * The system entering suspend state between timestamp acquisition and | |
1940 | * calling input_set_timestamp can result in inaccurate conversions. | |
1941 | */ | |
1942 | void input_set_timestamp(struct input_dev *dev, ktime_t timestamp) | |
1943 | { | |
1944 | dev->timestamp[INPUT_CLK_MONO] = timestamp; | |
1945 | dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp); | |
1946 | dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp, | |
1947 | TK_OFFS_BOOT); | |
1948 | } | |
1949 | EXPORT_SYMBOL(input_set_timestamp); | |
1950 | ||
1951 | /** | |
1952 | * input_get_timestamp - get timestamp for input events | |
1953 | * @dev: input device to get timestamp from | |
1954 | * | |
1955 | * A valid timestamp is a timestamp of non-zero value. | |
1956 | */ | |
1957 | ktime_t *input_get_timestamp(struct input_dev *dev) | |
1958 | { | |
1959 | const ktime_t invalid_timestamp = ktime_set(0, 0); | |
1960 | ||
1961 | if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp)) | |
1962 | input_set_timestamp(dev, ktime_get()); | |
1963 | ||
1964 | return dev->timestamp; | |
1965 | } | |
1966 | EXPORT_SYMBOL(input_get_timestamp); | |
1967 | ||
534565f2 DT |
1968 | /** |
1969 | * input_set_capability - mark device as capable of a certain event | |
1970 | * @dev: device that is capable of emitting or accepting event | |
1971 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1972 | * @code: event code | |
1973 | * | |
1974 | * In addition to setting up corresponding bit in appropriate capability | |
1975 | * bitmap the function also adjusts dev->evbit. | |
1976 | */ | |
1977 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1978 | { | |
1979 | switch (type) { | |
1980 | case EV_KEY: | |
1981 | __set_bit(code, dev->keybit); | |
1982 | break; | |
1983 | ||
1984 | case EV_REL: | |
1985 | __set_bit(code, dev->relbit); | |
1986 | break; | |
1987 | ||
1988 | case EV_ABS: | |
28a2a2e1 DT |
1989 | input_alloc_absinfo(dev); |
1990 | if (!dev->absinfo) | |
1991 | return; | |
1992 | ||
534565f2 DT |
1993 | __set_bit(code, dev->absbit); |
1994 | break; | |
1995 | ||
1996 | case EV_MSC: | |
1997 | __set_bit(code, dev->mscbit); | |
1998 | break; | |
1999 | ||
2000 | case EV_SW: | |
2001 | __set_bit(code, dev->swbit); | |
2002 | break; | |
2003 | ||
2004 | case EV_LED: | |
2005 | __set_bit(code, dev->ledbit); | |
2006 | break; | |
2007 | ||
2008 | case EV_SND: | |
2009 | __set_bit(code, dev->sndbit); | |
2010 | break; | |
2011 | ||
2012 | case EV_FF: | |
2013 | __set_bit(code, dev->ffbit); | |
2014 | break; | |
2015 | ||
22d1c398 DB |
2016 | case EV_PWR: |
2017 | /* do nothing */ | |
2018 | break; | |
2019 | ||
534565f2 | 2020 | default: |
67043f41 | 2021 | pr_err("%s: unknown type %u (code %u)\n", __func__, type, code); |
534565f2 DT |
2022 | dump_stack(); |
2023 | return; | |
2024 | } | |
2025 | ||
2026 | __set_bit(type, dev->evbit); | |
2027 | } | |
2028 | EXPORT_SYMBOL(input_set_capability); | |
2029 | ||
80b4895a JB |
2030 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
2031 | { | |
2032 | int mt_slots; | |
2033 | int i; | |
2034 | unsigned int events; | |
2035 | ||
8d18fba2 HR |
2036 | if (dev->mt) { |
2037 | mt_slots = dev->mt->num_slots; | |
80b4895a JB |
2038 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
2039 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
2040 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
8c127f07 | 2041 | mt_slots = clamp(mt_slots, 2, 32); |
80b4895a JB |
2042 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
2043 | mt_slots = 2; | |
2044 | } else { | |
2045 | mt_slots = 0; | |
2046 | } | |
2047 | ||
2048 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
2049 | ||
3e2b03da AG |
2050 | if (test_bit(EV_ABS, dev->evbit)) |
2051 | for_each_set_bit(i, dev->absbit, ABS_CNT) | |
2052 | events += input_is_mt_axis(i) ? mt_slots : 1; | |
80b4895a | 2053 | |
3e2b03da AG |
2054 | if (test_bit(EV_REL, dev->evbit)) |
2055 | events += bitmap_weight(dev->relbit, REL_CNT); | |
80b4895a | 2056 | |
7c75bf99 HR |
2057 | /* Make room for KEY and MSC events */ |
2058 | events += 7; | |
2059 | ||
80b4895a JB |
2060 | return events; |
2061 | } | |
2062 | ||
92a3a587 DT |
2063 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
2064 | do { \ | |
2065 | if (!test_bit(EV_##type, dev->evbit)) \ | |
2066 | memset(dev->bits##bit, 0, \ | |
2067 | sizeof(dev->bits##bit)); \ | |
2068 | } while (0) | |
2069 | ||
2070 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
2071 | { | |
2072 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
2073 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
2074 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
2075 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
2076 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
2077 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
2078 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
2079 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
2080 | } | |
2081 | ||
2be975c6 DT |
2082 | static void __input_unregister_device(struct input_dev *dev) |
2083 | { | |
2084 | struct input_handle *handle, *next; | |
2085 | ||
2086 | input_disconnect_device(dev); | |
2087 | ||
2088 | mutex_lock(&input_mutex); | |
2089 | ||
2090 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) | |
2091 | handle->handler->disconnect(handle); | |
2092 | WARN_ON(!list_empty(&dev->h_list)); | |
2093 | ||
2094 | del_timer_sync(&dev->timer); | |
2095 | list_del_init(&dev->node); | |
2096 | ||
2097 | input_wakeup_procfs_readers(); | |
2098 | ||
2099 | mutex_unlock(&input_mutex); | |
2100 | ||
2101 | device_del(&dev->dev); | |
2102 | } | |
2103 | ||
2104 | static void devm_input_device_unregister(struct device *dev, void *res) | |
2105 | { | |
2106 | struct input_devres *devres = res; | |
2107 | struct input_dev *input = devres->input; | |
2108 | ||
2109 | dev_dbg(dev, "%s: unregistering device %s\n", | |
2110 | __func__, dev_name(&input->dev)); | |
2111 | __input_unregister_device(input); | |
2112 | } | |
2113 | ||
027c71bb PG |
2114 | /** |
2115 | * input_enable_softrepeat - enable software autorepeat | |
2116 | * @dev: input device | |
2117 | * @delay: repeat delay | |
2118 | * @period: repeat period | |
2119 | * | |
2120 | * Enable software autorepeat on the input device. | |
2121 | */ | |
2122 | void input_enable_softrepeat(struct input_dev *dev, int delay, int period) | |
2123 | { | |
841b86f3 | 2124 | dev->timer.function = input_repeat_key; |
027c71bb PG |
2125 | dev->rep[REP_DELAY] = delay; |
2126 | dev->rep[REP_PERIOD] = period; | |
2127 | } | |
2128 | EXPORT_SYMBOL(input_enable_softrepeat); | |
2129 | ||
8006479c DT |
2130 | /** |
2131 | * input_register_device - register device with input core | |
2132 | * @dev: device to be registered | |
2133 | * | |
2134 | * This function registers device with input core. The device must be | |
2135 | * allocated with input_allocate_device() and all it's capabilities | |
2136 | * set up before registering. | |
2137 | * If function fails the device must be freed with input_free_device(). | |
2138 | * Once device has been successfully registered it can be unregistered | |
2139 | * with input_unregister_device(); input_free_device() should not be | |
2140 | * called in this case. | |
b666263b DT |
2141 | * |
2142 | * Note that this function is also used to register managed input devices | |
2143 | * (ones allocated with devm_input_allocate_device()). Such managed input | |
2144 | * devices need not be explicitly unregistered or freed, their tear down | |
2145 | * is controlled by the devres infrastructure. It is also worth noting | |
2146 | * that tear down of managed input devices is internally a 2-step process: | |
2147 | * registered managed input device is first unregistered, but stays in | |
2148 | * memory and can still handle input_event() calls (although events will | |
2149 | * not be delivered anywhere). The freeing of managed input device will | |
2150 | * happen later, when devres stack is unwound to the point where device | |
2151 | * allocation was made. | |
8006479c | 2152 | */ |
5f945489 | 2153 | int input_register_device(struct input_dev *dev) |
1da177e4 | 2154 | { |
2be975c6 | 2155 | struct input_devres *devres = NULL; |
1da177e4 | 2156 | struct input_handler *handler; |
7c75bf99 | 2157 | unsigned int packet_size; |
bd0ef235 DT |
2158 | const char *path; |
2159 | int error; | |
1da177e4 | 2160 | |
6ecfe51b DT |
2161 | if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) { |
2162 | dev_err(&dev->dev, | |
2163 | "Absolute device without dev->absinfo, refusing to register\n"); | |
2164 | return -EINVAL; | |
2165 | } | |
2166 | ||
2be975c6 DT |
2167 | if (dev->devres_managed) { |
2168 | devres = devres_alloc(devm_input_device_unregister, | |
c3f6f861 | 2169 | sizeof(*devres), GFP_KERNEL); |
2be975c6 DT |
2170 | if (!devres) |
2171 | return -ENOMEM; | |
2172 | ||
2173 | devres->input = dev; | |
2174 | } | |
2175 | ||
4f93df40 | 2176 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
8006479c | 2177 | __set_bit(EV_SYN, dev->evbit); |
0fbf87ca | 2178 | |
4f93df40 DT |
2179 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
2180 | __clear_bit(KEY_RESERVED, dev->keybit); | |
2181 | ||
92a3a587 DT |
2182 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
2183 | input_cleanse_bitmasks(dev); | |
2184 | ||
7c75bf99 HR |
2185 | packet_size = input_estimate_events_per_packet(dev); |
2186 | if (dev->hint_events_per_packet < packet_size) | |
2187 | dev->hint_events_per_packet = packet_size; | |
80b4895a | 2188 | |
95079b8a | 2189 | dev->max_vals = dev->hint_events_per_packet + 2; |
4369c64c | 2190 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); |
2be975c6 DT |
2191 | if (!dev->vals) { |
2192 | error = -ENOMEM; | |
2193 | goto err_devres_free; | |
2194 | } | |
80b4895a | 2195 | |
1da177e4 LT |
2196 | /* |
2197 | * If delay and period are pre-set by the driver, then autorepeating | |
2198 | * is handled by the driver itself and we don't do it in input.c. | |
2199 | */ | |
027c71bb PG |
2200 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) |
2201 | input_enable_softrepeat(dev, 250, 33); | |
1da177e4 | 2202 | |
aebd636b DT |
2203 | if (!dev->getkeycode) |
2204 | dev->getkeycode = input_default_getkeycode; | |
c8e4c772 | 2205 | |
aebd636b DT |
2206 | if (!dev->setkeycode) |
2207 | dev->setkeycode = input_default_setkeycode; | |
c8e4c772 | 2208 | |
e95656ea DT |
2209 | if (dev->poller) |
2210 | input_dev_poller_finalize(dev->poller); | |
2211 | ||
9657d75c | 2212 | error = device_add(&dev->dev); |
bd0ef235 | 2213 | if (error) |
2be975c6 | 2214 | goto err_free_vals; |
bd0ef235 | 2215 | |
9657d75c | 2216 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
da0c4901 JP |
2217 | pr_info("%s as %s\n", |
2218 | dev->name ? dev->name : "Unspecified device", | |
2219 | path ? path : "N/A"); | |
bd0ef235 | 2220 | kfree(path); |
10204020 | 2221 | |
8006479c | 2222 | error = mutex_lock_interruptible(&input_mutex); |
2be975c6 DT |
2223 | if (error) |
2224 | goto err_device_del; | |
8006479c DT |
2225 | |
2226 | list_add_tail(&dev->node, &input_dev_list); | |
2227 | ||
1da177e4 | 2228 | list_for_each_entry(handler, &input_handler_list, node) |
5b2a0826 | 2229 | input_attach_handler(dev, handler); |
1da177e4 | 2230 | |
f96b434d | 2231 | input_wakeup_procfs_readers(); |
5f945489 | 2232 | |
8006479c DT |
2233 | mutex_unlock(&input_mutex); |
2234 | ||
2be975c6 DT |
2235 | if (dev->devres_managed) { |
2236 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n", | |
2237 | __func__, dev_name(&dev->dev)); | |
2238 | devres_add(dev->dev.parent, devres); | |
2239 | } | |
5f945489 | 2240 | return 0; |
2be975c6 DT |
2241 | |
2242 | err_device_del: | |
2243 | device_del(&dev->dev); | |
2244 | err_free_vals: | |
2245 | kfree(dev->vals); | |
2246 | dev->vals = NULL; | |
2247 | err_devres_free: | |
2248 | devres_free(devres); | |
2249 | return error; | |
1da177e4 | 2250 | } |
ca56fe07 | 2251 | EXPORT_SYMBOL(input_register_device); |
1da177e4 | 2252 | |
8006479c DT |
2253 | /** |
2254 | * input_unregister_device - unregister previously registered device | |
2255 | * @dev: device to be unregistered | |
2256 | * | |
2257 | * This function unregisters an input device. Once device is unregistered | |
2258 | * the caller should not try to access it as it may get freed at any moment. | |
2259 | */ | |
1da177e4 LT |
2260 | void input_unregister_device(struct input_dev *dev) |
2261 | { | |
2be975c6 DT |
2262 | if (dev->devres_managed) { |
2263 | WARN_ON(devres_destroy(dev->dev.parent, | |
2264 | devm_input_device_unregister, | |
2265 | devm_input_device_match, | |
2266 | dev)); | |
2267 | __input_unregister_device(dev); | |
2268 | /* | |
2269 | * We do not do input_put_device() here because it will be done | |
2270 | * when 2nd devres fires up. | |
2271 | */ | |
2272 | } else { | |
2273 | __input_unregister_device(dev); | |
2274 | input_put_device(dev); | |
2275 | } | |
1da177e4 | 2276 | } |
ca56fe07 | 2277 | EXPORT_SYMBOL(input_unregister_device); |
1da177e4 | 2278 | |
8006479c DT |
2279 | /** |
2280 | * input_register_handler - register a new input handler | |
2281 | * @handler: handler to be registered | |
2282 | * | |
2283 | * This function registers a new input handler (interface) for input | |
2284 | * devices in the system and attaches it to all input devices that | |
2285 | * are compatible with the handler. | |
2286 | */ | |
4263cf0f | 2287 | int input_register_handler(struct input_handler *handler) |
1da177e4 LT |
2288 | { |
2289 | struct input_dev *dev; | |
7f8d4cad | 2290 | int error; |
8006479c | 2291 | |
7f8d4cad DT |
2292 | error = mutex_lock_interruptible(&input_mutex); |
2293 | if (error) | |
2294 | return error; | |
1da177e4 | 2295 | |
1da177e4 LT |
2296 | INIT_LIST_HEAD(&handler->h_list); |
2297 | ||
1da177e4 LT |
2298 | list_add_tail(&handler->node, &input_handler_list); |
2299 | ||
2300 | list_for_each_entry(dev, &input_dev_list, node) | |
5b2a0826 | 2301 | input_attach_handler(dev, handler); |
1da177e4 | 2302 | |
f96b434d | 2303 | input_wakeup_procfs_readers(); |
8006479c | 2304 | |
8006479c | 2305 | mutex_unlock(&input_mutex); |
7f8d4cad | 2306 | return 0; |
1da177e4 | 2307 | } |
ca56fe07 | 2308 | EXPORT_SYMBOL(input_register_handler); |
1da177e4 | 2309 | |
8006479c DT |
2310 | /** |
2311 | * input_unregister_handler - unregisters an input handler | |
2312 | * @handler: handler to be unregistered | |
2313 | * | |
2314 | * This function disconnects a handler from its input devices and | |
2315 | * removes it from lists of known handlers. | |
2316 | */ | |
1da177e4 LT |
2317 | void input_unregister_handler(struct input_handler *handler) |
2318 | { | |
5b2a0826 | 2319 | struct input_handle *handle, *next; |
1da177e4 | 2320 | |
8006479c DT |
2321 | mutex_lock(&input_mutex); |
2322 | ||
5b2a0826 | 2323 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
1da177e4 | 2324 | handler->disconnect(handle); |
5b2a0826 | 2325 | WARN_ON(!list_empty(&handler->h_list)); |
1da177e4 LT |
2326 | |
2327 | list_del_init(&handler->node); | |
2328 | ||
f96b434d | 2329 | input_wakeup_procfs_readers(); |
8006479c DT |
2330 | |
2331 | mutex_unlock(&input_mutex); | |
1da177e4 | 2332 | } |
ca56fe07 | 2333 | EXPORT_SYMBOL(input_unregister_handler); |
1da177e4 | 2334 | |
66d2a595 DT |
2335 | /** |
2336 | * input_handler_for_each_handle - handle iterator | |
2337 | * @handler: input handler to iterate | |
2338 | * @data: data for the callback | |
2339 | * @fn: function to be called for each handle | |
2340 | * | |
2341 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
2342 | * it @data and stop when @fn returns a non-zero value. The function is | |
ec8beff9 | 2343 | * using RCU to traverse the list and therefore may be using in atomic |
66d2a595 DT |
2344 | * contexts. The @fn callback is invoked from RCU critical section and |
2345 | * thus must not sleep. | |
2346 | */ | |
2347 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
2348 | int (*fn)(struct input_handle *, void *)) | |
2349 | { | |
2350 | struct input_handle *handle; | |
2351 | int retval = 0; | |
2352 | ||
2353 | rcu_read_lock(); | |
2354 | ||
2355 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2356 | retval = fn(handle, data); | |
2357 | if (retval) | |
2358 | break; | |
2359 | } | |
2360 | ||
2361 | rcu_read_unlock(); | |
2362 | ||
2363 | return retval; | |
2364 | } | |
2365 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2366 | ||
8006479c DT |
2367 | /** |
2368 | * input_register_handle - register a new input handle | |
2369 | * @handle: handle to register | |
2370 | * | |
2371 | * This function puts a new input handle onto device's | |
2372 | * and handler's lists so that events can flow through | |
2373 | * it once it is opened using input_open_device(). | |
2374 | * | |
2375 | * This function is supposed to be called from handler's | |
2376 | * connect() method. | |
2377 | */ | |
5b2a0826 DT |
2378 | int input_register_handle(struct input_handle *handle) |
2379 | { | |
2380 | struct input_handler *handler = handle->handler; | |
8006479c DT |
2381 | struct input_dev *dev = handle->dev; |
2382 | int error; | |
2383 | ||
2384 | /* | |
2385 | * We take dev->mutex here to prevent race with | |
2386 | * input_release_device(). | |
2387 | */ | |
2388 | error = mutex_lock_interruptible(&dev->mutex); | |
2389 | if (error) | |
2390 | return error; | |
ef7995f4 DT |
2391 | |
2392 | /* | |
2393 | * Filters go to the head of the list, normal handlers | |
2394 | * to the tail. | |
2395 | */ | |
2396 | if (handler->filter) | |
2397 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2398 | else | |
2399 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2400 | ||
8006479c | 2401 | mutex_unlock(&dev->mutex); |
5b2a0826 | 2402 | |
8006479c DT |
2403 | /* |
2404 | * Since we are supposed to be called from ->connect() | |
2405 | * which is mutually exclusive with ->disconnect() | |
2406 | * we can't be racing with input_unregister_handle() | |
2407 | * and so separate lock is not needed here. | |
2408 | */ | |
66d2a595 | 2409 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
5b2a0826 DT |
2410 | |
2411 | if (handler->start) | |
2412 | handler->start(handle); | |
2413 | ||
2414 | return 0; | |
2415 | } | |
2416 | EXPORT_SYMBOL(input_register_handle); | |
2417 | ||
8006479c DT |
2418 | /** |
2419 | * input_unregister_handle - unregister an input handle | |
2420 | * @handle: handle to unregister | |
2421 | * | |
2422 | * This function removes input handle from device's | |
2423 | * and handler's lists. | |
2424 | * | |
2425 | * This function is supposed to be called from handler's | |
2426 | * disconnect() method. | |
2427 | */ | |
5b2a0826 DT |
2428 | void input_unregister_handle(struct input_handle *handle) |
2429 | { | |
8006479c DT |
2430 | struct input_dev *dev = handle->dev; |
2431 | ||
66d2a595 | 2432 | list_del_rcu(&handle->h_node); |
8006479c DT |
2433 | |
2434 | /* | |
2435 | * Take dev->mutex to prevent race with input_release_device(). | |
2436 | */ | |
2437 | mutex_lock(&dev->mutex); | |
2438 | list_del_rcu(&handle->d_node); | |
2439 | mutex_unlock(&dev->mutex); | |
66d2a595 | 2440 | |
82ba56c2 | 2441 | synchronize_rcu(); |
5b2a0826 DT |
2442 | } |
2443 | EXPORT_SYMBOL(input_unregister_handle); | |
2444 | ||
7f8d4cad DT |
2445 | /** |
2446 | * input_get_new_minor - allocates a new input minor number | |
2447 | * @legacy_base: beginning or the legacy range to be searched | |
2448 | * @legacy_num: size of legacy range | |
2449 | * @allow_dynamic: whether we can also take ID from the dynamic range | |
2450 | * | |
2451 | * This function allocates a new device minor for from input major namespace. | |
2452 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num | |
2453 | * parameters and whether ID can be allocated from dynamic range if there are | |
2454 | * no free IDs in legacy range. | |
2455 | */ | |
2456 | int input_get_new_minor(int legacy_base, unsigned int legacy_num, | |
2457 | bool allow_dynamic) | |
1da177e4 | 2458 | { |
1da177e4 | 2459 | /* |
7f8d4cad DT |
2460 | * This function should be called from input handler's ->connect() |
2461 | * methods, which are serialized with input_mutex, so no additional | |
2462 | * locking is needed here. | |
1da177e4 | 2463 | */ |
7f8d4cad DT |
2464 | if (legacy_base >= 0) { |
2465 | int minor = ida_simple_get(&input_ida, | |
2466 | legacy_base, | |
2467 | legacy_base + legacy_num, | |
2468 | GFP_KERNEL); | |
2469 | if (minor >= 0 || !allow_dynamic) | |
2470 | return minor; | |
1da177e4 | 2471 | } |
2f2177c8 | 2472 | |
7f8d4cad DT |
2473 | return ida_simple_get(&input_ida, |
2474 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES, | |
2475 | GFP_KERNEL); | |
1da177e4 | 2476 | } |
7f8d4cad | 2477 | EXPORT_SYMBOL(input_get_new_minor); |
1da177e4 | 2478 | |
7f8d4cad DT |
2479 | /** |
2480 | * input_free_minor - release previously allocated minor | |
2481 | * @minor: minor to be released | |
2482 | * | |
2483 | * This function releases previously allocated input minor so that it can be | |
2484 | * reused later. | |
2485 | */ | |
2486 | void input_free_minor(unsigned int minor) | |
2487 | { | |
2488 | ida_simple_remove(&input_ida, minor); | |
2489 | } | |
2490 | EXPORT_SYMBOL(input_free_minor); | |
1da177e4 | 2491 | |
f96b434d | 2492 | static int __init input_init(void) |
1da177e4 | 2493 | { |
f96b434d | 2494 | int err; |
1da177e4 | 2495 | |
ea9f240b | 2496 | err = class_register(&input_class); |
d19fbe8a | 2497 | if (err) { |
da0c4901 | 2498 | pr_err("unable to register input_dev class\n"); |
d19fbe8a DT |
2499 | return err; |
2500 | } | |
2501 | ||
f96b434d DT |
2502 | err = input_proc_init(); |
2503 | if (err) | |
b0fdfebb | 2504 | goto fail1; |
1da177e4 | 2505 | |
7f8d4cad DT |
2506 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2507 | INPUT_MAX_CHAR_DEVICES, "input"); | |
f96b434d | 2508 | if (err) { |
da0c4901 | 2509 | pr_err("unable to register char major %d", INPUT_MAJOR); |
b0fdfebb | 2510 | goto fail2; |
1da177e4 | 2511 | } |
e334016f | 2512 | |
1da177e4 | 2513 | return 0; |
1da177e4 | 2514 | |
b0fdfebb | 2515 | fail2: input_proc_exit(); |
ea9f240b | 2516 | fail1: class_unregister(&input_class); |
f96b434d | 2517 | return err; |
1da177e4 LT |
2518 | } |
2519 | ||
2520 | static void __exit input_exit(void) | |
2521 | { | |
f96b434d | 2522 | input_proc_exit(); |
7f8d4cad DT |
2523 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2524 | INPUT_MAX_CHAR_DEVICES); | |
ea9f240b | 2525 | class_unregister(&input_class); |
1da177e4 LT |
2526 | } |
2527 | ||
2528 | subsys_initcall(input_init); | |
2529 | module_exit(input_exit); |