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1 | /* | |
2 | * The input core | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/input/mt.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/major.h> | |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/seq_file.h> | |
25 | #include <linux/poll.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/rcupdate.h> | |
29 | #include "input-compat.h" | |
30 | ||
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); | |
32 | MODULE_DESCRIPTION("Input core"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | #define INPUT_DEVICES 256 | |
36 | ||
37 | static LIST_HEAD(input_dev_list); | |
38 | static LIST_HEAD(input_handler_list); | |
39 | ||
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 | ||
48 | static struct input_handler *input_table[8]; | |
49 | ||
50 | static inline int is_event_supported(unsigned int code, | |
51 | unsigned long *bm, unsigned int max) | |
52 | { | |
53 | return code <= max && test_bit(code, bm); | |
54 | } | |
55 | ||
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; | |
61 | ||
62 | if (value > old_val - fuzz && value < old_val + fuzz) | |
63 | return (old_val * 3 + value) / 4; | |
64 | ||
65 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) | |
66 | return (old_val + value) / 2; | |
67 | } | |
68 | ||
69 | return value; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Pass event first through all filters and then, if event has not been | |
74 | * filtered out, through all open handles. This function is called with | |
75 | * dev->event_lock held and interrupts disabled. | |
76 | */ | |
77 | static void input_pass_event(struct input_dev *dev, | |
78 | unsigned int type, unsigned int code, int value) | |
79 | { | |
80 | struct input_handler *handler; | |
81 | struct input_handle *handle; | |
82 | ||
83 | rcu_read_lock(); | |
84 | ||
85 | handle = rcu_dereference(dev->grab); | |
86 | if (handle) | |
87 | handle->handler->event(handle, type, code, value); | |
88 | else { | |
89 | bool filtered = false; | |
90 | ||
91 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) { | |
92 | if (!handle->open) | |
93 | continue; | |
94 | ||
95 | handler = handle->handler; | |
96 | if (!handler->filter) { | |
97 | if (filtered) | |
98 | break; | |
99 | ||
100 | handler->event(handle, type, code, value); | |
101 | ||
102 | } else if (handler->filter(handle, type, code, value)) | |
103 | filtered = true; | |
104 | } | |
105 | } | |
106 | ||
107 | rcu_read_unlock(); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Generate software autorepeat event. Note that we take | |
112 | * dev->event_lock here to avoid racing with input_event | |
113 | * which may cause keys get "stuck". | |
114 | */ | |
115 | static void input_repeat_key(unsigned long data) | |
116 | { | |
117 | struct input_dev *dev = (void *) data; | |
118 | unsigned long flags; | |
119 | ||
120 | spin_lock_irqsave(&dev->event_lock, flags); | |
121 | ||
122 | if (test_bit(dev->repeat_key, dev->key) && | |
123 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { | |
124 | ||
125 | input_pass_event(dev, EV_KEY, dev->repeat_key, 2); | |
126 | ||
127 | if (dev->sync) { | |
128 | /* | |
129 | * Only send SYN_REPORT if we are not in a middle | |
130 | * of driver parsing a new hardware packet. | |
131 | * Otherwise assume that the driver will send | |
132 | * SYN_REPORT once it's done. | |
133 | */ | |
134 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
135 | } | |
136 | ||
137 | if (dev->rep[REP_PERIOD]) | |
138 | mod_timer(&dev->timer, jiffies + | |
139 | msecs_to_jiffies(dev->rep[REP_PERIOD])); | |
140 | } | |
141 | ||
142 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
143 | } | |
144 | ||
145 | static void input_start_autorepeat(struct input_dev *dev, int code) | |
146 | { | |
147 | if (test_bit(EV_REP, dev->evbit) && | |
148 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && | |
149 | dev->timer.data) { | |
150 | dev->repeat_key = code; | |
151 | mod_timer(&dev->timer, | |
152 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); | |
153 | } | |
154 | } | |
155 | ||
156 | static void input_stop_autorepeat(struct input_dev *dev) | |
157 | { | |
158 | del_timer(&dev->timer); | |
159 | } | |
160 | ||
161 | #define INPUT_IGNORE_EVENT 0 | |
162 | #define INPUT_PASS_TO_HANDLERS 1 | |
163 | #define INPUT_PASS_TO_DEVICE 2 | |
164 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) | |
165 | ||
166 | static int input_handle_abs_event(struct input_dev *dev, | |
167 | unsigned int code, int *pval) | |
168 | { | |
169 | bool is_mt_event; | |
170 | int *pold; | |
171 | ||
172 | if (code == ABS_MT_SLOT) { | |
173 | /* | |
174 | * "Stage" the event; we'll flush it later, when we | |
175 | * get actual touch data. | |
176 | */ | |
177 | if (*pval >= 0 && *pval < dev->mtsize) | |
178 | dev->slot = *pval; | |
179 | ||
180 | return INPUT_IGNORE_EVENT; | |
181 | } | |
182 | ||
183 | is_mt_event = input_is_mt_value(code); | |
184 | ||
185 | if (!is_mt_event) { | |
186 | pold = &dev->absinfo[code].value; | |
187 | } else if (dev->mt) { | |
188 | struct input_mt_slot *mtslot = &dev->mt[dev->slot]; | |
189 | pold = &mtslot->abs[code - ABS_MT_FIRST]; | |
190 | } else { | |
191 | /* | |
192 | * Bypass filtering for multi-touch events when | |
193 | * not employing slots. | |
194 | */ | |
195 | pold = NULL; | |
196 | } | |
197 | ||
198 | if (pold) { | |
199 | *pval = input_defuzz_abs_event(*pval, *pold, | |
200 | dev->absinfo[code].fuzz); | |
201 | if (*pold == *pval) | |
202 | return INPUT_IGNORE_EVENT; | |
203 | ||
204 | *pold = *pval; | |
205 | } | |
206 | ||
207 | /* Flush pending "slot" event */ | |
208 | if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { | |
209 | input_abs_set_val(dev, ABS_MT_SLOT, dev->slot); | |
210 | input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot); | |
211 | } | |
212 | ||
213 | return INPUT_PASS_TO_HANDLERS; | |
214 | } | |
215 | ||
216 | static void input_handle_event(struct input_dev *dev, | |
217 | unsigned int type, unsigned int code, int value) | |
218 | { | |
219 | int disposition = INPUT_IGNORE_EVENT; | |
220 | ||
221 | switch (type) { | |
222 | ||
223 | case EV_SYN: | |
224 | switch (code) { | |
225 | case SYN_CONFIG: | |
226 | disposition = INPUT_PASS_TO_ALL; | |
227 | break; | |
228 | ||
229 | case SYN_REPORT: | |
230 | if (!dev->sync) { | |
231 | dev->sync = true; | |
232 | disposition = INPUT_PASS_TO_HANDLERS; | |
233 | } | |
234 | break; | |
235 | case SYN_MT_REPORT: | |
236 | dev->sync = false; | |
237 | disposition = INPUT_PASS_TO_HANDLERS; | |
238 | break; | |
239 | } | |
240 | break; | |
241 | ||
242 | case EV_KEY: | |
243 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
244 | !!test_bit(code, dev->key) != value) { | |
245 | ||
246 | if (value != 2) { | |
247 | __change_bit(code, dev->key); | |
248 | if (value) | |
249 | input_start_autorepeat(dev, code); | |
250 | else | |
251 | input_stop_autorepeat(dev); | |
252 | } | |
253 | ||
254 | disposition = INPUT_PASS_TO_HANDLERS; | |
255 | } | |
256 | break; | |
257 | ||
258 | case EV_SW: | |
259 | if (is_event_supported(code, dev->swbit, SW_MAX) && | |
260 | !!test_bit(code, dev->sw) != value) { | |
261 | ||
262 | __change_bit(code, dev->sw); | |
263 | disposition = INPUT_PASS_TO_HANDLERS; | |
264 | } | |
265 | break; | |
266 | ||
267 | case EV_ABS: | |
268 | if (is_event_supported(code, dev->absbit, ABS_MAX)) | |
269 | disposition = input_handle_abs_event(dev, code, &value); | |
270 | ||
271 | break; | |
272 | ||
273 | case EV_REL: | |
274 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) | |
275 | disposition = INPUT_PASS_TO_HANDLERS; | |
276 | ||
277 | break; | |
278 | ||
279 | case EV_MSC: | |
280 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) | |
281 | disposition = INPUT_PASS_TO_ALL; | |
282 | ||
283 | break; | |
284 | ||
285 | case EV_LED: | |
286 | if (is_event_supported(code, dev->ledbit, LED_MAX) && | |
287 | !!test_bit(code, dev->led) != value) { | |
288 | ||
289 | __change_bit(code, dev->led); | |
290 | disposition = INPUT_PASS_TO_ALL; | |
291 | } | |
292 | break; | |
293 | ||
294 | case EV_SND: | |
295 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { | |
296 | ||
297 | if (!!test_bit(code, dev->snd) != !!value) | |
298 | __change_bit(code, dev->snd); | |
299 | disposition = INPUT_PASS_TO_ALL; | |
300 | } | |
301 | break; | |
302 | ||
303 | case EV_REP: | |
304 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { | |
305 | dev->rep[code] = value; | |
306 | disposition = INPUT_PASS_TO_ALL; | |
307 | } | |
308 | break; | |
309 | ||
310 | case EV_FF: | |
311 | if (value >= 0) | |
312 | disposition = INPUT_PASS_TO_ALL; | |
313 | break; | |
314 | ||
315 | case EV_PWR: | |
316 | disposition = INPUT_PASS_TO_ALL; | |
317 | break; | |
318 | } | |
319 | ||
320 | if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) | |
321 | dev->sync = false; | |
322 | ||
323 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) | |
324 | dev->event(dev, type, code, value); | |
325 | ||
326 | if (disposition & INPUT_PASS_TO_HANDLERS) | |
327 | input_pass_event(dev, type, code, value); | |
328 | } | |
329 | ||
330 | /** | |
331 | * input_event() - report new input event | |
332 | * @dev: device that generated the event | |
333 | * @type: type of the event | |
334 | * @code: event code | |
335 | * @value: value of the event | |
336 | * | |
337 | * This function should be used by drivers implementing various input | |
338 | * devices to report input events. See also input_inject_event(). | |
339 | * | |
340 | * NOTE: input_event() may be safely used right after input device was | |
341 | * allocated with input_allocate_device(), even before it is registered | |
342 | * with input_register_device(), but the event will not reach any of the | |
343 | * input handlers. Such early invocation of input_event() may be used | |
344 | * to 'seed' initial state of a switch or initial position of absolute | |
345 | * axis, etc. | |
346 | */ | |
347 | void input_event(struct input_dev *dev, | |
348 | unsigned int type, unsigned int code, int value) | |
349 | { | |
350 | unsigned long flags; | |
351 | ||
352 | if (is_event_supported(type, dev->evbit, EV_MAX)) { | |
353 | ||
354 | spin_lock_irqsave(&dev->event_lock, flags); | |
355 | add_input_randomness(type, code, value); | |
356 | input_handle_event(dev, type, code, value); | |
357 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
358 | } | |
359 | } | |
360 | EXPORT_SYMBOL(input_event); | |
361 | ||
362 | /** | |
363 | * input_inject_event() - send input event from input handler | |
364 | * @handle: input handle to send event through | |
365 | * @type: type of the event | |
366 | * @code: event code | |
367 | * @value: value of the event | |
368 | * | |
369 | * Similar to input_event() but will ignore event if device is | |
370 | * "grabbed" and handle injecting event is not the one that owns | |
371 | * the device. | |
372 | */ | |
373 | void input_inject_event(struct input_handle *handle, | |
374 | unsigned int type, unsigned int code, int value) | |
375 | { | |
376 | struct input_dev *dev = handle->dev; | |
377 | struct input_handle *grab; | |
378 | unsigned long flags; | |
379 | ||
380 | if (is_event_supported(type, dev->evbit, EV_MAX)) { | |
381 | spin_lock_irqsave(&dev->event_lock, flags); | |
382 | ||
383 | rcu_read_lock(); | |
384 | grab = rcu_dereference(dev->grab); | |
385 | if (!grab || grab == handle) | |
386 | input_handle_event(dev, type, code, value); | |
387 | rcu_read_unlock(); | |
388 | ||
389 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
390 | } | |
391 | } | |
392 | EXPORT_SYMBOL(input_inject_event); | |
393 | ||
394 | /** | |
395 | * input_alloc_absinfo - allocates array of input_absinfo structs | |
396 | * @dev: the input device emitting absolute events | |
397 | * | |
398 | * If the absinfo struct the caller asked for is already allocated, this | |
399 | * functions will not do anything. | |
400 | */ | |
401 | void input_alloc_absinfo(struct input_dev *dev) | |
402 | { | |
403 | if (!dev->absinfo) | |
404 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), | |
405 | GFP_KERNEL); | |
406 | ||
407 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); | |
408 | } | |
409 | EXPORT_SYMBOL(input_alloc_absinfo); | |
410 | ||
411 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, | |
412 | int min, int max, int fuzz, int flat) | |
413 | { | |
414 | struct input_absinfo *absinfo; | |
415 | ||
416 | input_alloc_absinfo(dev); | |
417 | if (!dev->absinfo) | |
418 | return; | |
419 | ||
420 | absinfo = &dev->absinfo[axis]; | |
421 | absinfo->minimum = min; | |
422 | absinfo->maximum = max; | |
423 | absinfo->fuzz = fuzz; | |
424 | absinfo->flat = flat; | |
425 | ||
426 | dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); | |
427 | } | |
428 | EXPORT_SYMBOL(input_set_abs_params); | |
429 | ||
430 | ||
431 | /** | |
432 | * input_grab_device - grabs device for exclusive use | |
433 | * @handle: input handle that wants to own the device | |
434 | * | |
435 | * When a device is grabbed by an input handle all events generated by | |
436 | * the device are delivered only to this handle. Also events injected | |
437 | * by other input handles are ignored while device is grabbed. | |
438 | */ | |
439 | int input_grab_device(struct input_handle *handle) | |
440 | { | |
441 | struct input_dev *dev = handle->dev; | |
442 | int retval; | |
443 | ||
444 | retval = mutex_lock_interruptible(&dev->mutex); | |
445 | if (retval) | |
446 | return retval; | |
447 | ||
448 | if (dev->grab) { | |
449 | retval = -EBUSY; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | rcu_assign_pointer(dev->grab, handle); | |
454 | ||
455 | out: | |
456 | mutex_unlock(&dev->mutex); | |
457 | return retval; | |
458 | } | |
459 | EXPORT_SYMBOL(input_grab_device); | |
460 | ||
461 | static void __input_release_device(struct input_handle *handle) | |
462 | { | |
463 | struct input_dev *dev = handle->dev; | |
464 | ||
465 | if (dev->grab == handle) { | |
466 | rcu_assign_pointer(dev->grab, NULL); | |
467 | /* Make sure input_pass_event() notices that grab is gone */ | |
468 | synchronize_rcu(); | |
469 | ||
470 | list_for_each_entry(handle, &dev->h_list, d_node) | |
471 | if (handle->open && handle->handler->start) | |
472 | handle->handler->start(handle); | |
473 | } | |
474 | } | |
475 | ||
476 | /** | |
477 | * input_release_device - release previously grabbed device | |
478 | * @handle: input handle that owns the device | |
479 | * | |
480 | * Releases previously grabbed device so that other input handles can | |
481 | * start receiving input events. Upon release all handlers attached | |
482 | * to the device have their start() method called so they have a change | |
483 | * to synchronize device state with the rest of the system. | |
484 | */ | |
485 | void input_release_device(struct input_handle *handle) | |
486 | { | |
487 | struct input_dev *dev = handle->dev; | |
488 | ||
489 | mutex_lock(&dev->mutex); | |
490 | __input_release_device(handle); | |
491 | mutex_unlock(&dev->mutex); | |
492 | } | |
493 | EXPORT_SYMBOL(input_release_device); | |
494 | ||
495 | /** | |
496 | * input_open_device - open input device | |
497 | * @handle: handle through which device is being accessed | |
498 | * | |
499 | * This function should be called by input handlers when they | |
500 | * want to start receive events from given input device. | |
501 | */ | |
502 | int input_open_device(struct input_handle *handle) | |
503 | { | |
504 | struct input_dev *dev = handle->dev; | |
505 | int retval; | |
506 | ||
507 | retval = mutex_lock_interruptible(&dev->mutex); | |
508 | if (retval) | |
509 | return retval; | |
510 | ||
511 | if (dev->going_away) { | |
512 | retval = -ENODEV; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | handle->open++; | |
517 | ||
518 | if (!dev->users++ && dev->open) | |
519 | retval = dev->open(dev); | |
520 | ||
521 | if (retval) { | |
522 | dev->users--; | |
523 | if (!--handle->open) { | |
524 | /* | |
525 | * Make sure we are not delivering any more events | |
526 | * through this handle | |
527 | */ | |
528 | synchronize_rcu(); | |
529 | } | |
530 | } | |
531 | ||
532 | out: | |
533 | mutex_unlock(&dev->mutex); | |
534 | return retval; | |
535 | } | |
536 | EXPORT_SYMBOL(input_open_device); | |
537 | ||
538 | int input_flush_device(struct input_handle *handle, struct file *file) | |
539 | { | |
540 | struct input_dev *dev = handle->dev; | |
541 | int retval; | |
542 | ||
543 | retval = mutex_lock_interruptible(&dev->mutex); | |
544 | if (retval) | |
545 | return retval; | |
546 | ||
547 | if (dev->flush) | |
548 | retval = dev->flush(dev, file); | |
549 | ||
550 | mutex_unlock(&dev->mutex); | |
551 | return retval; | |
552 | } | |
553 | EXPORT_SYMBOL(input_flush_device); | |
554 | ||
555 | /** | |
556 | * input_close_device - close input device | |
557 | * @handle: handle through which device is being accessed | |
558 | * | |
559 | * This function should be called by input handlers when they | |
560 | * want to stop receive events from given input device. | |
561 | */ | |
562 | void input_close_device(struct input_handle *handle) | |
563 | { | |
564 | struct input_dev *dev = handle->dev; | |
565 | ||
566 | mutex_lock(&dev->mutex); | |
567 | ||
568 | __input_release_device(handle); | |
569 | ||
570 | if (!--dev->users && dev->close) | |
571 | dev->close(dev); | |
572 | ||
573 | if (!--handle->open) { | |
574 | /* | |
575 | * synchronize_rcu() makes sure that input_pass_event() | |
576 | * completed and that no more input events are delivered | |
577 | * through this handle | |
578 | */ | |
579 | synchronize_rcu(); | |
580 | } | |
581 | ||
582 | mutex_unlock(&dev->mutex); | |
583 | } | |
584 | EXPORT_SYMBOL(input_close_device); | |
585 | ||
586 | /* | |
587 | * Simulate keyup events for all keys that are marked as pressed. | |
588 | * The function must be called with dev->event_lock held. | |
589 | */ | |
590 | static void input_dev_release_keys(struct input_dev *dev) | |
591 | { | |
592 | int code; | |
593 | ||
594 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { | |
595 | for (code = 0; code <= KEY_MAX; code++) { | |
596 | if (is_event_supported(code, dev->keybit, KEY_MAX) && | |
597 | __test_and_clear_bit(code, dev->key)) { | |
598 | input_pass_event(dev, EV_KEY, code, 0); | |
599 | } | |
600 | } | |
601 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
602 | } | |
603 | } | |
604 | ||
605 | /* | |
606 | * Prepare device for unregistering | |
607 | */ | |
608 | static void input_disconnect_device(struct input_dev *dev) | |
609 | { | |
610 | struct input_handle *handle; | |
611 | ||
612 | /* | |
613 | * Mark device as going away. Note that we take dev->mutex here | |
614 | * not to protect access to dev->going_away but rather to ensure | |
615 | * that there are no threads in the middle of input_open_device() | |
616 | */ | |
617 | mutex_lock(&dev->mutex); | |
618 | dev->going_away = true; | |
619 | mutex_unlock(&dev->mutex); | |
620 | ||
621 | spin_lock_irq(&dev->event_lock); | |
622 | ||
623 | /* | |
624 | * Simulate keyup events for all pressed keys so that handlers | |
625 | * are not left with "stuck" keys. The driver may continue | |
626 | * generate events even after we done here but they will not | |
627 | * reach any handlers. | |
628 | */ | |
629 | input_dev_release_keys(dev); | |
630 | ||
631 | list_for_each_entry(handle, &dev->h_list, d_node) | |
632 | handle->open = 0; | |
633 | ||
634 | spin_unlock_irq(&dev->event_lock); | |
635 | } | |
636 | ||
637 | /** | |
638 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry | |
639 | * @ke: keymap entry containing scancode to be converted. | |
640 | * @scancode: pointer to the location where converted scancode should | |
641 | * be stored. | |
642 | * | |
643 | * This function is used to convert scancode stored in &struct keymap_entry | |
644 | * into scalar form understood by legacy keymap handling methods. These | |
645 | * methods expect scancodes to be represented as 'unsigned int'. | |
646 | */ | |
647 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, | |
648 | unsigned int *scancode) | |
649 | { | |
650 | switch (ke->len) { | |
651 | case 1: | |
652 | *scancode = *((u8 *)ke->scancode); | |
653 | break; | |
654 | ||
655 | case 2: | |
656 | *scancode = *((u16 *)ke->scancode); | |
657 | break; | |
658 | ||
659 | case 4: | |
660 | *scancode = *((u32 *)ke->scancode); | |
661 | break; | |
662 | ||
663 | default: | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | return 0; | |
668 | } | |
669 | EXPORT_SYMBOL(input_scancode_to_scalar); | |
670 | ||
671 | /* | |
672 | * Those routines handle the default case where no [gs]etkeycode() is | |
673 | * defined. In this case, an array indexed by the scancode is used. | |
674 | */ | |
675 | ||
676 | static unsigned int input_fetch_keycode(struct input_dev *dev, | |
677 | unsigned int index) | |
678 | { | |
679 | switch (dev->keycodesize) { | |
680 | case 1: | |
681 | return ((u8 *)dev->keycode)[index]; | |
682 | ||
683 | case 2: | |
684 | return ((u16 *)dev->keycode)[index]; | |
685 | ||
686 | default: | |
687 | return ((u32 *)dev->keycode)[index]; | |
688 | } | |
689 | } | |
690 | ||
691 | static int input_default_getkeycode(struct input_dev *dev, | |
692 | struct input_keymap_entry *ke) | |
693 | { | |
694 | unsigned int index; | |
695 | int error; | |
696 | ||
697 | if (!dev->keycodesize) | |
698 | return -EINVAL; | |
699 | ||
700 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) | |
701 | index = ke->index; | |
702 | else { | |
703 | error = input_scancode_to_scalar(ke, &index); | |
704 | if (error) | |
705 | return error; | |
706 | } | |
707 | ||
708 | if (index >= dev->keycodemax) | |
709 | return -EINVAL; | |
710 | ||
711 | ke->keycode = input_fetch_keycode(dev, index); | |
712 | ke->index = index; | |
713 | ke->len = sizeof(index); | |
714 | memcpy(ke->scancode, &index, sizeof(index)); | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static int input_default_setkeycode(struct input_dev *dev, | |
720 | const struct input_keymap_entry *ke, | |
721 | unsigned int *old_keycode) | |
722 | { | |
723 | unsigned int index; | |
724 | int error; | |
725 | int i; | |
726 | ||
727 | if (!dev->keycodesize) | |
728 | return -EINVAL; | |
729 | ||
730 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { | |
731 | index = ke->index; | |
732 | } else { | |
733 | error = input_scancode_to_scalar(ke, &index); | |
734 | if (error) | |
735 | return error; | |
736 | } | |
737 | ||
738 | if (index >= dev->keycodemax) | |
739 | return -EINVAL; | |
740 | ||
741 | if (dev->keycodesize < sizeof(ke->keycode) && | |
742 | (ke->keycode >> (dev->keycodesize * 8))) | |
743 | return -EINVAL; | |
744 | ||
745 | switch (dev->keycodesize) { | |
746 | case 1: { | |
747 | u8 *k = (u8 *)dev->keycode; | |
748 | *old_keycode = k[index]; | |
749 | k[index] = ke->keycode; | |
750 | break; | |
751 | } | |
752 | case 2: { | |
753 | u16 *k = (u16 *)dev->keycode; | |
754 | *old_keycode = k[index]; | |
755 | k[index] = ke->keycode; | |
756 | break; | |
757 | } | |
758 | default: { | |
759 | u32 *k = (u32 *)dev->keycode; | |
760 | *old_keycode = k[index]; | |
761 | k[index] = ke->keycode; | |
762 | break; | |
763 | } | |
764 | } | |
765 | ||
766 | __clear_bit(*old_keycode, dev->keybit); | |
767 | __set_bit(ke->keycode, dev->keybit); | |
768 | ||
769 | for (i = 0; i < dev->keycodemax; i++) { | |
770 | if (input_fetch_keycode(dev, i) == *old_keycode) { | |
771 | __set_bit(*old_keycode, dev->keybit); | |
772 | break; /* Setting the bit twice is useless, so break */ | |
773 | } | |
774 | } | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | /** | |
780 | * input_get_keycode - retrieve keycode currently mapped to a given scancode | |
781 | * @dev: input device which keymap is being queried | |
782 | * @ke: keymap entry | |
783 | * | |
784 | * This function should be called by anyone interested in retrieving current | |
785 | * keymap. Presently evdev handlers use it. | |
786 | */ | |
787 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) | |
788 | { | |
789 | unsigned long flags; | |
790 | int retval; | |
791 | ||
792 | spin_lock_irqsave(&dev->event_lock, flags); | |
793 | retval = dev->getkeycode(dev, ke); | |
794 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
795 | ||
796 | return retval; | |
797 | } | |
798 | EXPORT_SYMBOL(input_get_keycode); | |
799 | ||
800 | /** | |
801 | * input_set_keycode - attribute a keycode to a given scancode | |
802 | * @dev: input device which keymap is being updated | |
803 | * @ke: new keymap entry | |
804 | * | |
805 | * This function should be called by anyone needing to update current | |
806 | * keymap. Presently keyboard and evdev handlers use it. | |
807 | */ | |
808 | int input_set_keycode(struct input_dev *dev, | |
809 | const struct input_keymap_entry *ke) | |
810 | { | |
811 | unsigned long flags; | |
812 | unsigned int old_keycode; | |
813 | int retval; | |
814 | ||
815 | if (ke->keycode > KEY_MAX) | |
816 | return -EINVAL; | |
817 | ||
818 | spin_lock_irqsave(&dev->event_lock, flags); | |
819 | ||
820 | retval = dev->setkeycode(dev, ke, &old_keycode); | |
821 | if (retval) | |
822 | goto out; | |
823 | ||
824 | /* Make sure KEY_RESERVED did not get enabled. */ | |
825 | __clear_bit(KEY_RESERVED, dev->keybit); | |
826 | ||
827 | /* | |
828 | * Simulate keyup event if keycode is not present | |
829 | * in the keymap anymore | |
830 | */ | |
831 | if (test_bit(EV_KEY, dev->evbit) && | |
832 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && | |
833 | __test_and_clear_bit(old_keycode, dev->key)) { | |
834 | ||
835 | input_pass_event(dev, EV_KEY, old_keycode, 0); | |
836 | if (dev->sync) | |
837 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); | |
838 | } | |
839 | ||
840 | out: | |
841 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
842 | ||
843 | return retval; | |
844 | } | |
845 | EXPORT_SYMBOL(input_set_keycode); | |
846 | ||
847 | #define MATCH_BIT(bit, max) \ | |
848 | for (i = 0; i < BITS_TO_LONGS(max); i++) \ | |
849 | if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ | |
850 | break; \ | |
851 | if (i != BITS_TO_LONGS(max)) \ | |
852 | continue; | |
853 | ||
854 | static const struct input_device_id *input_match_device(struct input_handler *handler, | |
855 | struct input_dev *dev) | |
856 | { | |
857 | const struct input_device_id *id; | |
858 | int i; | |
859 | ||
860 | for (id = handler->id_table; id->flags || id->driver_info; id++) { | |
861 | ||
862 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) | |
863 | if (id->bustype != dev->id.bustype) | |
864 | continue; | |
865 | ||
866 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) | |
867 | if (id->vendor != dev->id.vendor) | |
868 | continue; | |
869 | ||
870 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) | |
871 | if (id->product != dev->id.product) | |
872 | continue; | |
873 | ||
874 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) | |
875 | if (id->version != dev->id.version) | |
876 | continue; | |
877 | ||
878 | MATCH_BIT(evbit, EV_MAX); | |
879 | MATCH_BIT(keybit, KEY_MAX); | |
880 | MATCH_BIT(relbit, REL_MAX); | |
881 | MATCH_BIT(absbit, ABS_MAX); | |
882 | MATCH_BIT(mscbit, MSC_MAX); | |
883 | MATCH_BIT(ledbit, LED_MAX); | |
884 | MATCH_BIT(sndbit, SND_MAX); | |
885 | MATCH_BIT(ffbit, FF_MAX); | |
886 | MATCH_BIT(swbit, SW_MAX); | |
887 | ||
888 | if (!handler->match || handler->match(handler, dev)) | |
889 | return id; | |
890 | } | |
891 | ||
892 | return NULL; | |
893 | } | |
894 | ||
895 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) | |
896 | { | |
897 | const struct input_device_id *id; | |
898 | int error; | |
899 | ||
900 | id = input_match_device(handler, dev); | |
901 | if (!id) | |
902 | return -ENODEV; | |
903 | ||
904 | error = handler->connect(handler, dev, id); | |
905 | if (error && error != -ENODEV) | |
906 | pr_err("failed to attach handler %s to device %s, error: %d\n", | |
907 | handler->name, kobject_name(&dev->dev.kobj), error); | |
908 | ||
909 | return error; | |
910 | } | |
911 | ||
912 | #ifdef CONFIG_COMPAT | |
913 | ||
914 | static int input_bits_to_string(char *buf, int buf_size, | |
915 | unsigned long bits, bool skip_empty) | |
916 | { | |
917 | int len = 0; | |
918 | ||
919 | if (INPUT_COMPAT_TEST) { | |
920 | u32 dword = bits >> 32; | |
921 | if (dword || !skip_empty) | |
922 | len += snprintf(buf, buf_size, "%x ", dword); | |
923 | ||
924 | dword = bits & 0xffffffffUL; | |
925 | if (dword || !skip_empty || len) | |
926 | len += snprintf(buf + len, max(buf_size - len, 0), | |
927 | "%x", dword); | |
928 | } else { | |
929 | if (bits || !skip_empty) | |
930 | len += snprintf(buf, buf_size, "%lx", bits); | |
931 | } | |
932 | ||
933 | return len; | |
934 | } | |
935 | ||
936 | #else /* !CONFIG_COMPAT */ | |
937 | ||
938 | static int input_bits_to_string(char *buf, int buf_size, | |
939 | unsigned long bits, bool skip_empty) | |
940 | { | |
941 | return bits || !skip_empty ? | |
942 | snprintf(buf, buf_size, "%lx", bits) : 0; | |
943 | } | |
944 | ||
945 | #endif | |
946 | ||
947 | #ifdef CONFIG_PROC_FS | |
948 | ||
949 | static struct proc_dir_entry *proc_bus_input_dir; | |
950 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); | |
951 | static int input_devices_state; | |
952 | ||
953 | static inline void input_wakeup_procfs_readers(void) | |
954 | { | |
955 | input_devices_state++; | |
956 | wake_up(&input_devices_poll_wait); | |
957 | } | |
958 | ||
959 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) | |
960 | { | |
961 | poll_wait(file, &input_devices_poll_wait, wait); | |
962 | if (file->f_version != input_devices_state) { | |
963 | file->f_version = input_devices_state; | |
964 | return POLLIN | POLLRDNORM; | |
965 | } | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | union input_seq_state { | |
971 | struct { | |
972 | unsigned short pos; | |
973 | bool mutex_acquired; | |
974 | }; | |
975 | void *p; | |
976 | }; | |
977 | ||
978 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) | |
979 | { | |
980 | union input_seq_state *state = (union input_seq_state *)&seq->private; | |
981 | int error; | |
982 | ||
983 | /* We need to fit into seq->private pointer */ | |
984 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
985 | ||
986 | error = mutex_lock_interruptible(&input_mutex); | |
987 | if (error) { | |
988 | state->mutex_acquired = false; | |
989 | return ERR_PTR(error); | |
990 | } | |
991 | ||
992 | state->mutex_acquired = true; | |
993 | ||
994 | return seq_list_start(&input_dev_list, *pos); | |
995 | } | |
996 | ||
997 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
998 | { | |
999 | return seq_list_next(v, &input_dev_list, pos); | |
1000 | } | |
1001 | ||
1002 | static void input_seq_stop(struct seq_file *seq, void *v) | |
1003 | { | |
1004 | union input_seq_state *state = (union input_seq_state *)&seq->private; | |
1005 | ||
1006 | if (state->mutex_acquired) | |
1007 | mutex_unlock(&input_mutex); | |
1008 | } | |
1009 | ||
1010 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, | |
1011 | unsigned long *bitmap, int max) | |
1012 | { | |
1013 | int i; | |
1014 | bool skip_empty = true; | |
1015 | char buf[18]; | |
1016 | ||
1017 | seq_printf(seq, "B: %s=", name); | |
1018 | ||
1019 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1020 | if (input_bits_to_string(buf, sizeof(buf), | |
1021 | bitmap[i], skip_empty)) { | |
1022 | skip_empty = false; | |
1023 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * If no output was produced print a single 0. | |
1029 | */ | |
1030 | if (skip_empty) | |
1031 | seq_puts(seq, "0"); | |
1032 | ||
1033 | seq_putc(seq, '\n'); | |
1034 | } | |
1035 | ||
1036 | static int input_devices_seq_show(struct seq_file *seq, void *v) | |
1037 | { | |
1038 | struct input_dev *dev = container_of(v, struct input_dev, node); | |
1039 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); | |
1040 | struct input_handle *handle; | |
1041 | ||
1042 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", | |
1043 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); | |
1044 | ||
1045 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); | |
1046 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); | |
1047 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); | |
1048 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); | |
1049 | seq_printf(seq, "H: Handlers="); | |
1050 | ||
1051 | list_for_each_entry(handle, &dev->h_list, d_node) | |
1052 | seq_printf(seq, "%s ", handle->name); | |
1053 | seq_putc(seq, '\n'); | |
1054 | ||
1055 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); | |
1056 | ||
1057 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); | |
1058 | if (test_bit(EV_KEY, dev->evbit)) | |
1059 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); | |
1060 | if (test_bit(EV_REL, dev->evbit)) | |
1061 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); | |
1062 | if (test_bit(EV_ABS, dev->evbit)) | |
1063 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); | |
1064 | if (test_bit(EV_MSC, dev->evbit)) | |
1065 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); | |
1066 | if (test_bit(EV_LED, dev->evbit)) | |
1067 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); | |
1068 | if (test_bit(EV_SND, dev->evbit)) | |
1069 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); | |
1070 | if (test_bit(EV_FF, dev->evbit)) | |
1071 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); | |
1072 | if (test_bit(EV_SW, dev->evbit)) | |
1073 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); | |
1074 | ||
1075 | seq_putc(seq, '\n'); | |
1076 | ||
1077 | kfree(path); | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static const struct seq_operations input_devices_seq_ops = { | |
1082 | .start = input_devices_seq_start, | |
1083 | .next = input_devices_seq_next, | |
1084 | .stop = input_seq_stop, | |
1085 | .show = input_devices_seq_show, | |
1086 | }; | |
1087 | ||
1088 | static int input_proc_devices_open(struct inode *inode, struct file *file) | |
1089 | { | |
1090 | return seq_open(file, &input_devices_seq_ops); | |
1091 | } | |
1092 | ||
1093 | static const struct file_operations input_devices_fileops = { | |
1094 | .owner = THIS_MODULE, | |
1095 | .open = input_proc_devices_open, | |
1096 | .poll = input_proc_devices_poll, | |
1097 | .read = seq_read, | |
1098 | .llseek = seq_lseek, | |
1099 | .release = seq_release, | |
1100 | }; | |
1101 | ||
1102 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) | |
1103 | { | |
1104 | union input_seq_state *state = (union input_seq_state *)&seq->private; | |
1105 | int error; | |
1106 | ||
1107 | /* We need to fit into seq->private pointer */ | |
1108 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); | |
1109 | ||
1110 | error = mutex_lock_interruptible(&input_mutex); | |
1111 | if (error) { | |
1112 | state->mutex_acquired = false; | |
1113 | return ERR_PTR(error); | |
1114 | } | |
1115 | ||
1116 | state->mutex_acquired = true; | |
1117 | state->pos = *pos; | |
1118 | ||
1119 | return seq_list_start(&input_handler_list, *pos); | |
1120 | } | |
1121 | ||
1122 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1123 | { | |
1124 | union input_seq_state *state = (union input_seq_state *)&seq->private; | |
1125 | ||
1126 | state->pos = *pos + 1; | |
1127 | return seq_list_next(v, &input_handler_list, pos); | |
1128 | } | |
1129 | ||
1130 | static int input_handlers_seq_show(struct seq_file *seq, void *v) | |
1131 | { | |
1132 | struct input_handler *handler = container_of(v, struct input_handler, node); | |
1133 | union input_seq_state *state = (union input_seq_state *)&seq->private; | |
1134 | ||
1135 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); | |
1136 | if (handler->filter) | |
1137 | seq_puts(seq, " (filter)"); | |
1138 | if (handler->fops) | |
1139 | seq_printf(seq, " Minor=%d", handler->minor); | |
1140 | seq_putc(seq, '\n'); | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static const struct seq_operations input_handlers_seq_ops = { | |
1146 | .start = input_handlers_seq_start, | |
1147 | .next = input_handlers_seq_next, | |
1148 | .stop = input_seq_stop, | |
1149 | .show = input_handlers_seq_show, | |
1150 | }; | |
1151 | ||
1152 | static int input_proc_handlers_open(struct inode *inode, struct file *file) | |
1153 | { | |
1154 | return seq_open(file, &input_handlers_seq_ops); | |
1155 | } | |
1156 | ||
1157 | static const struct file_operations input_handlers_fileops = { | |
1158 | .owner = THIS_MODULE, | |
1159 | .open = input_proc_handlers_open, | |
1160 | .read = seq_read, | |
1161 | .llseek = seq_lseek, | |
1162 | .release = seq_release, | |
1163 | }; | |
1164 | ||
1165 | static int __init input_proc_init(void) | |
1166 | { | |
1167 | struct proc_dir_entry *entry; | |
1168 | ||
1169 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); | |
1170 | if (!proc_bus_input_dir) | |
1171 | return -ENOMEM; | |
1172 | ||
1173 | entry = proc_create("devices", 0, proc_bus_input_dir, | |
1174 | &input_devices_fileops); | |
1175 | if (!entry) | |
1176 | goto fail1; | |
1177 | ||
1178 | entry = proc_create("handlers", 0, proc_bus_input_dir, | |
1179 | &input_handlers_fileops); | |
1180 | if (!entry) | |
1181 | goto fail2; | |
1182 | ||
1183 | return 0; | |
1184 | ||
1185 | fail2: remove_proc_entry("devices", proc_bus_input_dir); | |
1186 | fail1: remove_proc_entry("bus/input", NULL); | |
1187 | return -ENOMEM; | |
1188 | } | |
1189 | ||
1190 | static void input_proc_exit(void) | |
1191 | { | |
1192 | remove_proc_entry("devices", proc_bus_input_dir); | |
1193 | remove_proc_entry("handlers", proc_bus_input_dir); | |
1194 | remove_proc_entry("bus/input", NULL); | |
1195 | } | |
1196 | ||
1197 | #else /* !CONFIG_PROC_FS */ | |
1198 | static inline void input_wakeup_procfs_readers(void) { } | |
1199 | static inline int input_proc_init(void) { return 0; } | |
1200 | static inline void input_proc_exit(void) { } | |
1201 | #endif | |
1202 | ||
1203 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ | |
1204 | static ssize_t input_dev_show_##name(struct device *dev, \ | |
1205 | struct device_attribute *attr, \ | |
1206 | char *buf) \ | |
1207 | { \ | |
1208 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1209 | \ | |
1210 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ | |
1211 | input_dev->name ? input_dev->name : ""); \ | |
1212 | } \ | |
1213 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) | |
1214 | ||
1215 | INPUT_DEV_STRING_ATTR_SHOW(name); | |
1216 | INPUT_DEV_STRING_ATTR_SHOW(phys); | |
1217 | INPUT_DEV_STRING_ATTR_SHOW(uniq); | |
1218 | ||
1219 | static int input_print_modalias_bits(char *buf, int size, | |
1220 | char name, unsigned long *bm, | |
1221 | unsigned int min_bit, unsigned int max_bit) | |
1222 | { | |
1223 | int len = 0, i; | |
1224 | ||
1225 | len += snprintf(buf, max(size, 0), "%c", name); | |
1226 | for (i = min_bit; i < max_bit; i++) | |
1227 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) | |
1228 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); | |
1229 | return len; | |
1230 | } | |
1231 | ||
1232 | static int input_print_modalias(char *buf, int size, struct input_dev *id, | |
1233 | int add_cr) | |
1234 | { | |
1235 | int len; | |
1236 | ||
1237 | len = snprintf(buf, max(size, 0), | |
1238 | "input:b%04Xv%04Xp%04Xe%04X-", | |
1239 | id->id.bustype, id->id.vendor, | |
1240 | id->id.product, id->id.version); | |
1241 | ||
1242 | len += input_print_modalias_bits(buf + len, size - len, | |
1243 | 'e', id->evbit, 0, EV_MAX); | |
1244 | len += input_print_modalias_bits(buf + len, size - len, | |
1245 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); | |
1246 | len += input_print_modalias_bits(buf + len, size - len, | |
1247 | 'r', id->relbit, 0, REL_MAX); | |
1248 | len += input_print_modalias_bits(buf + len, size - len, | |
1249 | 'a', id->absbit, 0, ABS_MAX); | |
1250 | len += input_print_modalias_bits(buf + len, size - len, | |
1251 | 'm', id->mscbit, 0, MSC_MAX); | |
1252 | len += input_print_modalias_bits(buf + len, size - len, | |
1253 | 'l', id->ledbit, 0, LED_MAX); | |
1254 | len += input_print_modalias_bits(buf + len, size - len, | |
1255 | 's', id->sndbit, 0, SND_MAX); | |
1256 | len += input_print_modalias_bits(buf + len, size - len, | |
1257 | 'f', id->ffbit, 0, FF_MAX); | |
1258 | len += input_print_modalias_bits(buf + len, size - len, | |
1259 | 'w', id->swbit, 0, SW_MAX); | |
1260 | ||
1261 | if (add_cr) | |
1262 | len += snprintf(buf + len, max(size - len, 0), "\n"); | |
1263 | ||
1264 | return len; | |
1265 | } | |
1266 | ||
1267 | static ssize_t input_dev_show_modalias(struct device *dev, | |
1268 | struct device_attribute *attr, | |
1269 | char *buf) | |
1270 | { | |
1271 | struct input_dev *id = to_input_dev(dev); | |
1272 | ssize_t len; | |
1273 | ||
1274 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); | |
1275 | ||
1276 | return min_t(int, len, PAGE_SIZE); | |
1277 | } | |
1278 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); | |
1279 | ||
1280 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, | |
1281 | int max, int add_cr); | |
1282 | ||
1283 | static ssize_t input_dev_show_properties(struct device *dev, | |
1284 | struct device_attribute *attr, | |
1285 | char *buf) | |
1286 | { | |
1287 | struct input_dev *input_dev = to_input_dev(dev); | |
1288 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, | |
1289 | INPUT_PROP_MAX, true); | |
1290 | return min_t(int, len, PAGE_SIZE); | |
1291 | } | |
1292 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); | |
1293 | ||
1294 | static struct attribute *input_dev_attrs[] = { | |
1295 | &dev_attr_name.attr, | |
1296 | &dev_attr_phys.attr, | |
1297 | &dev_attr_uniq.attr, | |
1298 | &dev_attr_modalias.attr, | |
1299 | &dev_attr_properties.attr, | |
1300 | NULL | |
1301 | }; | |
1302 | ||
1303 | static struct attribute_group input_dev_attr_group = { | |
1304 | .attrs = input_dev_attrs, | |
1305 | }; | |
1306 | ||
1307 | #define INPUT_DEV_ID_ATTR(name) \ | |
1308 | static ssize_t input_dev_show_id_##name(struct device *dev, \ | |
1309 | struct device_attribute *attr, \ | |
1310 | char *buf) \ | |
1311 | { \ | |
1312 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1313 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ | |
1314 | } \ | |
1315 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) | |
1316 | ||
1317 | INPUT_DEV_ID_ATTR(bustype); | |
1318 | INPUT_DEV_ID_ATTR(vendor); | |
1319 | INPUT_DEV_ID_ATTR(product); | |
1320 | INPUT_DEV_ID_ATTR(version); | |
1321 | ||
1322 | static struct attribute *input_dev_id_attrs[] = { | |
1323 | &dev_attr_bustype.attr, | |
1324 | &dev_attr_vendor.attr, | |
1325 | &dev_attr_product.attr, | |
1326 | &dev_attr_version.attr, | |
1327 | NULL | |
1328 | }; | |
1329 | ||
1330 | static struct attribute_group input_dev_id_attr_group = { | |
1331 | .name = "id", | |
1332 | .attrs = input_dev_id_attrs, | |
1333 | }; | |
1334 | ||
1335 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, | |
1336 | int max, int add_cr) | |
1337 | { | |
1338 | int i; | |
1339 | int len = 0; | |
1340 | bool skip_empty = true; | |
1341 | ||
1342 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { | |
1343 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), | |
1344 | bitmap[i], skip_empty); | |
1345 | if (len) { | |
1346 | skip_empty = false; | |
1347 | if (i > 0) | |
1348 | len += snprintf(buf + len, max(buf_size - len, 0), " "); | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * If no output was produced print a single 0. | |
1354 | */ | |
1355 | if (len == 0) | |
1356 | len = snprintf(buf, buf_size, "%d", 0); | |
1357 | ||
1358 | if (add_cr) | |
1359 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); | |
1360 | ||
1361 | return len; | |
1362 | } | |
1363 | ||
1364 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ | |
1365 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ | |
1366 | struct device_attribute *attr, \ | |
1367 | char *buf) \ | |
1368 | { \ | |
1369 | struct input_dev *input_dev = to_input_dev(dev); \ | |
1370 | int len = input_print_bitmap(buf, PAGE_SIZE, \ | |
1371 | input_dev->bm##bit, ev##_MAX, \ | |
1372 | true); \ | |
1373 | return min_t(int, len, PAGE_SIZE); \ | |
1374 | } \ | |
1375 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) | |
1376 | ||
1377 | INPUT_DEV_CAP_ATTR(EV, ev); | |
1378 | INPUT_DEV_CAP_ATTR(KEY, key); | |
1379 | INPUT_DEV_CAP_ATTR(REL, rel); | |
1380 | INPUT_DEV_CAP_ATTR(ABS, abs); | |
1381 | INPUT_DEV_CAP_ATTR(MSC, msc); | |
1382 | INPUT_DEV_CAP_ATTR(LED, led); | |
1383 | INPUT_DEV_CAP_ATTR(SND, snd); | |
1384 | INPUT_DEV_CAP_ATTR(FF, ff); | |
1385 | INPUT_DEV_CAP_ATTR(SW, sw); | |
1386 | ||
1387 | static struct attribute *input_dev_caps_attrs[] = { | |
1388 | &dev_attr_ev.attr, | |
1389 | &dev_attr_key.attr, | |
1390 | &dev_attr_rel.attr, | |
1391 | &dev_attr_abs.attr, | |
1392 | &dev_attr_msc.attr, | |
1393 | &dev_attr_led.attr, | |
1394 | &dev_attr_snd.attr, | |
1395 | &dev_attr_ff.attr, | |
1396 | &dev_attr_sw.attr, | |
1397 | NULL | |
1398 | }; | |
1399 | ||
1400 | static struct attribute_group input_dev_caps_attr_group = { | |
1401 | .name = "capabilities", | |
1402 | .attrs = input_dev_caps_attrs, | |
1403 | }; | |
1404 | ||
1405 | static const struct attribute_group *input_dev_attr_groups[] = { | |
1406 | &input_dev_attr_group, | |
1407 | &input_dev_id_attr_group, | |
1408 | &input_dev_caps_attr_group, | |
1409 | NULL | |
1410 | }; | |
1411 | ||
1412 | static void input_dev_release(struct device *device) | |
1413 | { | |
1414 | struct input_dev *dev = to_input_dev(device); | |
1415 | ||
1416 | input_ff_destroy(dev); | |
1417 | input_mt_destroy_slots(dev); | |
1418 | kfree(dev->absinfo); | |
1419 | kfree(dev); | |
1420 | ||
1421 | module_put(THIS_MODULE); | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * Input uevent interface - loading event handlers based on | |
1426 | * device bitfields. | |
1427 | */ | |
1428 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, | |
1429 | const char *name, unsigned long *bitmap, int max) | |
1430 | { | |
1431 | int len; | |
1432 | ||
1433 | if (add_uevent_var(env, "%s", name)) | |
1434 | return -ENOMEM; | |
1435 | ||
1436 | len = input_print_bitmap(&env->buf[env->buflen - 1], | |
1437 | sizeof(env->buf) - env->buflen, | |
1438 | bitmap, max, false); | |
1439 | if (len >= (sizeof(env->buf) - env->buflen)) | |
1440 | return -ENOMEM; | |
1441 | ||
1442 | env->buflen += len; | |
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, | |
1447 | struct input_dev *dev) | |
1448 | { | |
1449 | int len; | |
1450 | ||
1451 | if (add_uevent_var(env, "MODALIAS=")) | |
1452 | return -ENOMEM; | |
1453 | ||
1454 | len = input_print_modalias(&env->buf[env->buflen - 1], | |
1455 | sizeof(env->buf) - env->buflen, | |
1456 | dev, 0); | |
1457 | if (len >= (sizeof(env->buf) - env->buflen)) | |
1458 | return -ENOMEM; | |
1459 | ||
1460 | env->buflen += len; | |
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ | |
1465 | do { \ | |
1466 | int err = add_uevent_var(env, fmt, val); \ | |
1467 | if (err) \ | |
1468 | return err; \ | |
1469 | } while (0) | |
1470 | ||
1471 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ | |
1472 | do { \ | |
1473 | int err = input_add_uevent_bm_var(env, name, bm, max); \ | |
1474 | if (err) \ | |
1475 | return err; \ | |
1476 | } while (0) | |
1477 | ||
1478 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ | |
1479 | do { \ | |
1480 | int err = input_add_uevent_modalias_var(env, dev); \ | |
1481 | if (err) \ | |
1482 | return err; \ | |
1483 | } while (0) | |
1484 | ||
1485 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) | |
1486 | { | |
1487 | struct input_dev *dev = to_input_dev(device); | |
1488 | ||
1489 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", | |
1490 | dev->id.bustype, dev->id.vendor, | |
1491 | dev->id.product, dev->id.version); | |
1492 | if (dev->name) | |
1493 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); | |
1494 | if (dev->phys) | |
1495 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); | |
1496 | if (dev->uniq) | |
1497 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); | |
1498 | ||
1499 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); | |
1500 | ||
1501 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); | |
1502 | if (test_bit(EV_KEY, dev->evbit)) | |
1503 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); | |
1504 | if (test_bit(EV_REL, dev->evbit)) | |
1505 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); | |
1506 | if (test_bit(EV_ABS, dev->evbit)) | |
1507 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); | |
1508 | if (test_bit(EV_MSC, dev->evbit)) | |
1509 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); | |
1510 | if (test_bit(EV_LED, dev->evbit)) | |
1511 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); | |
1512 | if (test_bit(EV_SND, dev->evbit)) | |
1513 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); | |
1514 | if (test_bit(EV_FF, dev->evbit)) | |
1515 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); | |
1516 | if (test_bit(EV_SW, dev->evbit)) | |
1517 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); | |
1518 | ||
1519 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); | |
1520 | ||
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ | |
1525 | do { \ | |
1526 | int i; \ | |
1527 | bool active; \ | |
1528 | \ | |
1529 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1530 | break; \ | |
1531 | \ | |
1532 | for (i = 0; i < type##_MAX; i++) { \ | |
1533 | if (!test_bit(i, dev->bits##bit)) \ | |
1534 | continue; \ | |
1535 | \ | |
1536 | active = test_bit(i, dev->bits); \ | |
1537 | if (!active && !on) \ | |
1538 | continue; \ | |
1539 | \ | |
1540 | dev->event(dev, EV_##type, i, on ? active : 0); \ | |
1541 | } \ | |
1542 | } while (0) | |
1543 | ||
1544 | static void input_dev_toggle(struct input_dev *dev, bool activate) | |
1545 | { | |
1546 | if (!dev->event) | |
1547 | return; | |
1548 | ||
1549 | INPUT_DO_TOGGLE(dev, LED, led, activate); | |
1550 | INPUT_DO_TOGGLE(dev, SND, snd, activate); | |
1551 | ||
1552 | if (activate && test_bit(EV_REP, dev->evbit)) { | |
1553 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); | |
1554 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * input_reset_device() - reset/restore the state of input device | |
1560 | * @dev: input device whose state needs to be reset | |
1561 | * | |
1562 | * This function tries to reset the state of an opened input device and | |
1563 | * bring internal state and state if the hardware in sync with each other. | |
1564 | * We mark all keys as released, restore LED state, repeat rate, etc. | |
1565 | */ | |
1566 | void input_reset_device(struct input_dev *dev) | |
1567 | { | |
1568 | mutex_lock(&dev->mutex); | |
1569 | ||
1570 | if (dev->users) { | |
1571 | input_dev_toggle(dev, true); | |
1572 | ||
1573 | /* | |
1574 | * Keys that have been pressed at suspend time are unlikely | |
1575 | * to be still pressed when we resume. | |
1576 | */ | |
1577 | spin_lock_irq(&dev->event_lock); | |
1578 | input_dev_release_keys(dev); | |
1579 | spin_unlock_irq(&dev->event_lock); | |
1580 | } | |
1581 | ||
1582 | mutex_unlock(&dev->mutex); | |
1583 | } | |
1584 | EXPORT_SYMBOL(input_reset_device); | |
1585 | ||
1586 | #ifdef CONFIG_PM | |
1587 | static int input_dev_suspend(struct device *dev) | |
1588 | { | |
1589 | struct input_dev *input_dev = to_input_dev(dev); | |
1590 | ||
1591 | mutex_lock(&input_dev->mutex); | |
1592 | ||
1593 | if (input_dev->users) | |
1594 | input_dev_toggle(input_dev, false); | |
1595 | ||
1596 | mutex_unlock(&input_dev->mutex); | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static int input_dev_resume(struct device *dev) | |
1602 | { | |
1603 | struct input_dev *input_dev = to_input_dev(dev); | |
1604 | ||
1605 | input_reset_device(input_dev); | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
1610 | static const struct dev_pm_ops input_dev_pm_ops = { | |
1611 | .suspend = input_dev_suspend, | |
1612 | .resume = input_dev_resume, | |
1613 | .poweroff = input_dev_suspend, | |
1614 | .restore = input_dev_resume, | |
1615 | }; | |
1616 | #endif /* CONFIG_PM */ | |
1617 | ||
1618 | static struct device_type input_dev_type = { | |
1619 | .groups = input_dev_attr_groups, | |
1620 | .release = input_dev_release, | |
1621 | .uevent = input_dev_uevent, | |
1622 | #ifdef CONFIG_PM | |
1623 | .pm = &input_dev_pm_ops, | |
1624 | #endif | |
1625 | }; | |
1626 | ||
1627 | static char *input_devnode(struct device *dev, umode_t *mode) | |
1628 | { | |
1629 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); | |
1630 | } | |
1631 | ||
1632 | struct class input_class = { | |
1633 | .name = "input", | |
1634 | .devnode = input_devnode, | |
1635 | }; | |
1636 | EXPORT_SYMBOL_GPL(input_class); | |
1637 | ||
1638 | /** | |
1639 | * input_allocate_device - allocate memory for new input device | |
1640 | * | |
1641 | * Returns prepared struct input_dev or NULL. | |
1642 | * | |
1643 | * NOTE: Use input_free_device() to free devices that have not been | |
1644 | * registered; input_unregister_device() should be used for already | |
1645 | * registered devices. | |
1646 | */ | |
1647 | struct input_dev *input_allocate_device(void) | |
1648 | { | |
1649 | struct input_dev *dev; | |
1650 | ||
1651 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); | |
1652 | if (dev) { | |
1653 | dev->dev.type = &input_dev_type; | |
1654 | dev->dev.class = &input_class; | |
1655 | device_initialize(&dev->dev); | |
1656 | mutex_init(&dev->mutex); | |
1657 | spin_lock_init(&dev->event_lock); | |
1658 | INIT_LIST_HEAD(&dev->h_list); | |
1659 | INIT_LIST_HEAD(&dev->node); | |
1660 | ||
1661 | __module_get(THIS_MODULE); | |
1662 | } | |
1663 | ||
1664 | return dev; | |
1665 | } | |
1666 | EXPORT_SYMBOL(input_allocate_device); | |
1667 | ||
1668 | /** | |
1669 | * input_free_device - free memory occupied by input_dev structure | |
1670 | * @dev: input device to free | |
1671 | * | |
1672 | * This function should only be used if input_register_device() | |
1673 | * was not called yet or if it failed. Once device was registered | |
1674 | * use input_unregister_device() and memory will be freed once last | |
1675 | * reference to the device is dropped. | |
1676 | * | |
1677 | * Device should be allocated by input_allocate_device(). | |
1678 | * | |
1679 | * NOTE: If there are references to the input device then memory | |
1680 | * will not be freed until last reference is dropped. | |
1681 | */ | |
1682 | void input_free_device(struct input_dev *dev) | |
1683 | { | |
1684 | if (dev) | |
1685 | input_put_device(dev); | |
1686 | } | |
1687 | EXPORT_SYMBOL(input_free_device); | |
1688 | ||
1689 | /** | |
1690 | * input_set_capability - mark device as capable of a certain event | |
1691 | * @dev: device that is capable of emitting or accepting event | |
1692 | * @type: type of the event (EV_KEY, EV_REL, etc...) | |
1693 | * @code: event code | |
1694 | * | |
1695 | * In addition to setting up corresponding bit in appropriate capability | |
1696 | * bitmap the function also adjusts dev->evbit. | |
1697 | */ | |
1698 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) | |
1699 | { | |
1700 | switch (type) { | |
1701 | case EV_KEY: | |
1702 | __set_bit(code, dev->keybit); | |
1703 | break; | |
1704 | ||
1705 | case EV_REL: | |
1706 | __set_bit(code, dev->relbit); | |
1707 | break; | |
1708 | ||
1709 | case EV_ABS: | |
1710 | __set_bit(code, dev->absbit); | |
1711 | break; | |
1712 | ||
1713 | case EV_MSC: | |
1714 | __set_bit(code, dev->mscbit); | |
1715 | break; | |
1716 | ||
1717 | case EV_SW: | |
1718 | __set_bit(code, dev->swbit); | |
1719 | break; | |
1720 | ||
1721 | case EV_LED: | |
1722 | __set_bit(code, dev->ledbit); | |
1723 | break; | |
1724 | ||
1725 | case EV_SND: | |
1726 | __set_bit(code, dev->sndbit); | |
1727 | break; | |
1728 | ||
1729 | case EV_FF: | |
1730 | __set_bit(code, dev->ffbit); | |
1731 | break; | |
1732 | ||
1733 | case EV_PWR: | |
1734 | /* do nothing */ | |
1735 | break; | |
1736 | ||
1737 | default: | |
1738 | pr_err("input_set_capability: unknown type %u (code %u)\n", | |
1739 | type, code); | |
1740 | dump_stack(); | |
1741 | return; | |
1742 | } | |
1743 | ||
1744 | __set_bit(type, dev->evbit); | |
1745 | } | |
1746 | EXPORT_SYMBOL(input_set_capability); | |
1747 | ||
1748 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) | |
1749 | { | |
1750 | int mt_slots; | |
1751 | int i; | |
1752 | unsigned int events; | |
1753 | ||
1754 | if (dev->mtsize) { | |
1755 | mt_slots = dev->mtsize; | |
1756 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { | |
1757 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - | |
1758 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, | |
1759 | mt_slots = clamp(mt_slots, 2, 32); | |
1760 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { | |
1761 | mt_slots = 2; | |
1762 | } else { | |
1763 | mt_slots = 0; | |
1764 | } | |
1765 | ||
1766 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ | |
1767 | ||
1768 | for (i = 0; i < ABS_CNT; i++) { | |
1769 | if (test_bit(i, dev->absbit)) { | |
1770 | if (input_is_mt_axis(i)) | |
1771 | events += mt_slots; | |
1772 | else | |
1773 | events++; | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | for (i = 0; i < REL_CNT; i++) | |
1778 | if (test_bit(i, dev->relbit)) | |
1779 | events++; | |
1780 | ||
1781 | return events; | |
1782 | } | |
1783 | ||
1784 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ | |
1785 | do { \ | |
1786 | if (!test_bit(EV_##type, dev->evbit)) \ | |
1787 | memset(dev->bits##bit, 0, \ | |
1788 | sizeof(dev->bits##bit)); \ | |
1789 | } while (0) | |
1790 | ||
1791 | static void input_cleanse_bitmasks(struct input_dev *dev) | |
1792 | { | |
1793 | INPUT_CLEANSE_BITMASK(dev, KEY, key); | |
1794 | INPUT_CLEANSE_BITMASK(dev, REL, rel); | |
1795 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); | |
1796 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); | |
1797 | INPUT_CLEANSE_BITMASK(dev, LED, led); | |
1798 | INPUT_CLEANSE_BITMASK(dev, SND, snd); | |
1799 | INPUT_CLEANSE_BITMASK(dev, FF, ff); | |
1800 | INPUT_CLEANSE_BITMASK(dev, SW, sw); | |
1801 | } | |
1802 | ||
1803 | /** | |
1804 | * input_register_device - register device with input core | |
1805 | * @dev: device to be registered | |
1806 | * | |
1807 | * This function registers device with input core. The device must be | |
1808 | * allocated with input_allocate_device() and all it's capabilities | |
1809 | * set up before registering. | |
1810 | * If function fails the device must be freed with input_free_device(). | |
1811 | * Once device has been successfully registered it can be unregistered | |
1812 | * with input_unregister_device(); input_free_device() should not be | |
1813 | * called in this case. | |
1814 | */ | |
1815 | int input_register_device(struct input_dev *dev) | |
1816 | { | |
1817 | static atomic_t input_no = ATOMIC_INIT(0); | |
1818 | struct input_handler *handler; | |
1819 | const char *path; | |
1820 | int error; | |
1821 | ||
1822 | /* Every input device generates EV_SYN/SYN_REPORT events. */ | |
1823 | __set_bit(EV_SYN, dev->evbit); | |
1824 | ||
1825 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ | |
1826 | __clear_bit(KEY_RESERVED, dev->keybit); | |
1827 | ||
1828 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ | |
1829 | input_cleanse_bitmasks(dev); | |
1830 | ||
1831 | if (!dev->hint_events_per_packet) | |
1832 | dev->hint_events_per_packet = | |
1833 | input_estimate_events_per_packet(dev); | |
1834 | ||
1835 | /* | |
1836 | * If delay and period are pre-set by the driver, then autorepeating | |
1837 | * is handled by the driver itself and we don't do it in input.c. | |
1838 | */ | |
1839 | init_timer(&dev->timer); | |
1840 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { | |
1841 | dev->timer.data = (long) dev; | |
1842 | dev->timer.function = input_repeat_key; | |
1843 | dev->rep[REP_DELAY] = 250; | |
1844 | dev->rep[REP_PERIOD] = 33; | |
1845 | } | |
1846 | ||
1847 | if (!dev->getkeycode) | |
1848 | dev->getkeycode = input_default_getkeycode; | |
1849 | ||
1850 | if (!dev->setkeycode) | |
1851 | dev->setkeycode = input_default_setkeycode; | |
1852 | ||
1853 | dev_set_name(&dev->dev, "input%ld", | |
1854 | (unsigned long) atomic_inc_return(&input_no) - 1); | |
1855 | ||
1856 | error = device_add(&dev->dev); | |
1857 | if (error) | |
1858 | return error; | |
1859 | ||
1860 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); | |
1861 | pr_info("%s as %s\n", | |
1862 | dev->name ? dev->name : "Unspecified device", | |
1863 | path ? path : "N/A"); | |
1864 | kfree(path); | |
1865 | ||
1866 | error = mutex_lock_interruptible(&input_mutex); | |
1867 | if (error) { | |
1868 | device_del(&dev->dev); | |
1869 | return error; | |
1870 | } | |
1871 | ||
1872 | list_add_tail(&dev->node, &input_dev_list); | |
1873 | ||
1874 | list_for_each_entry(handler, &input_handler_list, node) | |
1875 | input_attach_handler(dev, handler); | |
1876 | ||
1877 | input_wakeup_procfs_readers(); | |
1878 | ||
1879 | mutex_unlock(&input_mutex); | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | EXPORT_SYMBOL(input_register_device); | |
1884 | ||
1885 | /** | |
1886 | * input_unregister_device - unregister previously registered device | |
1887 | * @dev: device to be unregistered | |
1888 | * | |
1889 | * This function unregisters an input device. Once device is unregistered | |
1890 | * the caller should not try to access it as it may get freed at any moment. | |
1891 | */ | |
1892 | void input_unregister_device(struct input_dev *dev) | |
1893 | { | |
1894 | struct input_handle *handle, *next; | |
1895 | ||
1896 | input_disconnect_device(dev); | |
1897 | ||
1898 | mutex_lock(&input_mutex); | |
1899 | ||
1900 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) | |
1901 | handle->handler->disconnect(handle); | |
1902 | WARN_ON(!list_empty(&dev->h_list)); | |
1903 | ||
1904 | del_timer_sync(&dev->timer); | |
1905 | list_del_init(&dev->node); | |
1906 | ||
1907 | input_wakeup_procfs_readers(); | |
1908 | ||
1909 | mutex_unlock(&input_mutex); | |
1910 | ||
1911 | device_unregister(&dev->dev); | |
1912 | } | |
1913 | EXPORT_SYMBOL(input_unregister_device); | |
1914 | ||
1915 | /** | |
1916 | * input_register_handler - register a new input handler | |
1917 | * @handler: handler to be registered | |
1918 | * | |
1919 | * This function registers a new input handler (interface) for input | |
1920 | * devices in the system and attaches it to all input devices that | |
1921 | * are compatible with the handler. | |
1922 | */ | |
1923 | int input_register_handler(struct input_handler *handler) | |
1924 | { | |
1925 | struct input_dev *dev; | |
1926 | int retval; | |
1927 | ||
1928 | retval = mutex_lock_interruptible(&input_mutex); | |
1929 | if (retval) | |
1930 | return retval; | |
1931 | ||
1932 | INIT_LIST_HEAD(&handler->h_list); | |
1933 | ||
1934 | if (handler->fops != NULL) { | |
1935 | if (input_table[handler->minor >> 5]) { | |
1936 | retval = -EBUSY; | |
1937 | goto out; | |
1938 | } | |
1939 | input_table[handler->minor >> 5] = handler; | |
1940 | } | |
1941 | ||
1942 | list_add_tail(&handler->node, &input_handler_list); | |
1943 | ||
1944 | list_for_each_entry(dev, &input_dev_list, node) | |
1945 | input_attach_handler(dev, handler); | |
1946 | ||
1947 | input_wakeup_procfs_readers(); | |
1948 | ||
1949 | out: | |
1950 | mutex_unlock(&input_mutex); | |
1951 | return retval; | |
1952 | } | |
1953 | EXPORT_SYMBOL(input_register_handler); | |
1954 | ||
1955 | /** | |
1956 | * input_unregister_handler - unregisters an input handler | |
1957 | * @handler: handler to be unregistered | |
1958 | * | |
1959 | * This function disconnects a handler from its input devices and | |
1960 | * removes it from lists of known handlers. | |
1961 | */ | |
1962 | void input_unregister_handler(struct input_handler *handler) | |
1963 | { | |
1964 | struct input_handle *handle, *next; | |
1965 | ||
1966 | mutex_lock(&input_mutex); | |
1967 | ||
1968 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) | |
1969 | handler->disconnect(handle); | |
1970 | WARN_ON(!list_empty(&handler->h_list)); | |
1971 | ||
1972 | list_del_init(&handler->node); | |
1973 | ||
1974 | if (handler->fops != NULL) | |
1975 | input_table[handler->minor >> 5] = NULL; | |
1976 | ||
1977 | input_wakeup_procfs_readers(); | |
1978 | ||
1979 | mutex_unlock(&input_mutex); | |
1980 | } | |
1981 | EXPORT_SYMBOL(input_unregister_handler); | |
1982 | ||
1983 | /** | |
1984 | * input_handler_for_each_handle - handle iterator | |
1985 | * @handler: input handler to iterate | |
1986 | * @data: data for the callback | |
1987 | * @fn: function to be called for each handle | |
1988 | * | |
1989 | * Iterate over @bus's list of devices, and call @fn for each, passing | |
1990 | * it @data and stop when @fn returns a non-zero value. The function is | |
1991 | * using RCU to traverse the list and therefore may be usind in atonic | |
1992 | * contexts. The @fn callback is invoked from RCU critical section and | |
1993 | * thus must not sleep. | |
1994 | */ | |
1995 | int input_handler_for_each_handle(struct input_handler *handler, void *data, | |
1996 | int (*fn)(struct input_handle *, void *)) | |
1997 | { | |
1998 | struct input_handle *handle; | |
1999 | int retval = 0; | |
2000 | ||
2001 | rcu_read_lock(); | |
2002 | ||
2003 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { | |
2004 | retval = fn(handle, data); | |
2005 | if (retval) | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | rcu_read_unlock(); | |
2010 | ||
2011 | return retval; | |
2012 | } | |
2013 | EXPORT_SYMBOL(input_handler_for_each_handle); | |
2014 | ||
2015 | /** | |
2016 | * input_register_handle - register a new input handle | |
2017 | * @handle: handle to register | |
2018 | * | |
2019 | * This function puts a new input handle onto device's | |
2020 | * and handler's lists so that events can flow through | |
2021 | * it once it is opened using input_open_device(). | |
2022 | * | |
2023 | * This function is supposed to be called from handler's | |
2024 | * connect() method. | |
2025 | */ | |
2026 | int input_register_handle(struct input_handle *handle) | |
2027 | { | |
2028 | struct input_handler *handler = handle->handler; | |
2029 | struct input_dev *dev = handle->dev; | |
2030 | int error; | |
2031 | ||
2032 | /* | |
2033 | * We take dev->mutex here to prevent race with | |
2034 | * input_release_device(). | |
2035 | */ | |
2036 | error = mutex_lock_interruptible(&dev->mutex); | |
2037 | if (error) | |
2038 | return error; | |
2039 | ||
2040 | /* | |
2041 | * Filters go to the head of the list, normal handlers | |
2042 | * to the tail. | |
2043 | */ | |
2044 | if (handler->filter) | |
2045 | list_add_rcu(&handle->d_node, &dev->h_list); | |
2046 | else | |
2047 | list_add_tail_rcu(&handle->d_node, &dev->h_list); | |
2048 | ||
2049 | mutex_unlock(&dev->mutex); | |
2050 | ||
2051 | /* | |
2052 | * Since we are supposed to be called from ->connect() | |
2053 | * which is mutually exclusive with ->disconnect() | |
2054 | * we can't be racing with input_unregister_handle() | |
2055 | * and so separate lock is not needed here. | |
2056 | */ | |
2057 | list_add_tail_rcu(&handle->h_node, &handler->h_list); | |
2058 | ||
2059 | if (handler->start) | |
2060 | handler->start(handle); | |
2061 | ||
2062 | return 0; | |
2063 | } | |
2064 | EXPORT_SYMBOL(input_register_handle); | |
2065 | ||
2066 | /** | |
2067 | * input_unregister_handle - unregister an input handle | |
2068 | * @handle: handle to unregister | |
2069 | * | |
2070 | * This function removes input handle from device's | |
2071 | * and handler's lists. | |
2072 | * | |
2073 | * This function is supposed to be called from handler's | |
2074 | * disconnect() method. | |
2075 | */ | |
2076 | void input_unregister_handle(struct input_handle *handle) | |
2077 | { | |
2078 | struct input_dev *dev = handle->dev; | |
2079 | ||
2080 | list_del_rcu(&handle->h_node); | |
2081 | ||
2082 | /* | |
2083 | * Take dev->mutex to prevent race with input_release_device(). | |
2084 | */ | |
2085 | mutex_lock(&dev->mutex); | |
2086 | list_del_rcu(&handle->d_node); | |
2087 | mutex_unlock(&dev->mutex); | |
2088 | ||
2089 | synchronize_rcu(); | |
2090 | } | |
2091 | EXPORT_SYMBOL(input_unregister_handle); | |
2092 | ||
2093 | static int input_open_file(struct inode *inode, struct file *file) | |
2094 | { | |
2095 | struct input_handler *handler; | |
2096 | const struct file_operations *old_fops, *new_fops = NULL; | |
2097 | int err; | |
2098 | ||
2099 | err = mutex_lock_interruptible(&input_mutex); | |
2100 | if (err) | |
2101 | return err; | |
2102 | ||
2103 | /* No load-on-demand here? */ | |
2104 | handler = input_table[iminor(inode) >> 5]; | |
2105 | if (handler) | |
2106 | new_fops = fops_get(handler->fops); | |
2107 | ||
2108 | mutex_unlock(&input_mutex); | |
2109 | ||
2110 | /* | |
2111 | * That's _really_ odd. Usually NULL ->open means "nothing special", | |
2112 | * not "no device". Oh, well... | |
2113 | */ | |
2114 | if (!new_fops || !new_fops->open) { | |
2115 | fops_put(new_fops); | |
2116 | err = -ENODEV; | |
2117 | goto out; | |
2118 | } | |
2119 | ||
2120 | old_fops = file->f_op; | |
2121 | file->f_op = new_fops; | |
2122 | ||
2123 | err = new_fops->open(inode, file); | |
2124 | if (err) { | |
2125 | fops_put(file->f_op); | |
2126 | file->f_op = fops_get(old_fops); | |
2127 | } | |
2128 | fops_put(old_fops); | |
2129 | out: | |
2130 | return err; | |
2131 | } | |
2132 | ||
2133 | static const struct file_operations input_fops = { | |
2134 | .owner = THIS_MODULE, | |
2135 | .open = input_open_file, | |
2136 | .llseek = noop_llseek, | |
2137 | }; | |
2138 | ||
2139 | static int __init input_init(void) | |
2140 | { | |
2141 | int err; | |
2142 | ||
2143 | err = class_register(&input_class); | |
2144 | if (err) { | |
2145 | pr_err("unable to register input_dev class\n"); | |
2146 | return err; | |
2147 | } | |
2148 | ||
2149 | err = input_proc_init(); | |
2150 | if (err) | |
2151 | goto fail1; | |
2152 | ||
2153 | err = register_chrdev(INPUT_MAJOR, "input", &input_fops); | |
2154 | if (err) { | |
2155 | pr_err("unable to register char major %d", INPUT_MAJOR); | |
2156 | goto fail2; | |
2157 | } | |
2158 | ||
2159 | return 0; | |
2160 | ||
2161 | fail2: input_proc_exit(); | |
2162 | fail1: class_unregister(&input_class); | |
2163 | return err; | |
2164 | } | |
2165 | ||
2166 | static void __exit input_exit(void) | |
2167 | { | |
2168 | input_proc_exit(); | |
2169 | unregister_chrdev(INPUT_MAJOR, "input"); | |
2170 | class_unregister(&input_class); | |
2171 | } | |
2172 | ||
2173 | subsys_initcall(input_init); | |
2174 | module_exit(input_exit); |