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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/idr.h> |
18 | #include <linux/input/mt.h> |
19 | #include <linux/module.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/random.h> |
22 | #include <linux/major.h> |
23 | #include <linux/proc_fs.h> |
24 | #include <linux/sched.h> |
25 | #include <linux/seq_file.h> |
26 | #include <linux/poll.h> |
27 | #include <linux/device.h> |
28 | #include <linux/mutex.h> |
29 | #include <linux/rcupdate.h> |
30 | #include "input-compat.h" |
31 | |
32 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); |
33 | MODULE_DESCRIPTION("Input core"); |
34 | MODULE_LICENSE("GPL"); |
35 | |
36 | #define INPUT_MAX_CHAR_DEVICES 1024 |
37 | #define INPUT_FIRST_DYNAMIC_DEV 256 |
38 | static DEFINE_IDA(input_ida); |
39 | |
40 | static LIST_HEAD(input_dev_list); |
41 | static LIST_HEAD(input_handler_list); |
42 | |
43 | /* |
44 | * input_mutex protects access to both input_dev_list and input_handler_list. |
45 | * This also causes input_[un]register_device and input_[un]register_handler |
46 | * be mutually exclusive which simplifies locking in drivers implementing |
47 | * input handlers. |
48 | */ |
49 | static DEFINE_MUTEX(input_mutex); |
50 | |
51 | static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; |
52 | |
53 | static inline int is_event_supported(unsigned int code, |
54 | unsigned long *bm, unsigned int max) |
55 | { |
56 | return code <= max && test_bit(code, bm); |
57 | } |
58 | |
59 | static int input_defuzz_abs_event(int value, int old_val, int fuzz) |
60 | { |
61 | if (fuzz) { |
62 | if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2) |
63 | return old_val; |
64 | |
65 | if (value > old_val - fuzz && value < old_val + fuzz) |
66 | return (old_val * 3 + value) / 4; |
67 | |
68 | if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) |
69 | return (old_val + value) / 2; |
70 | } |
71 | |
72 | return value; |
73 | } |
74 | |
75 | static void input_start_autorepeat(struct input_dev *dev, int code) |
76 | { |
77 | if (test_bit(EV_REP, dev->evbit) && |
78 | dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && |
79 | dev->timer.data) { |
80 | dev->repeat_key = code; |
81 | mod_timer(&dev->timer, |
82 | jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); |
83 | } |
84 | } |
85 | |
86 | static void input_stop_autorepeat(struct input_dev *dev) |
87 | { |
88 | del_timer(&dev->timer); |
89 | } |
90 | |
91 | /* |
92 | * Pass event first through all filters and then, if event has not been |
93 | * filtered out, through all open handles. This function is called with |
94 | * dev->event_lock held and interrupts disabled. |
95 | */ |
96 | static unsigned int input_to_handler(struct input_handle *handle, |
97 | struct input_value *vals, unsigned int count) |
98 | { |
99 | struct input_handler *handler = handle->handler; |
100 | struct input_value *end = vals; |
101 | struct input_value *v; |
102 | |
103 | for (v = vals; v != vals + count; v++) { |
104 | if (handler->filter && |
105 | handler->filter(handle, v->type, v->code, v->value)) |
106 | continue; |
107 | if (end != v) |
108 | *end = *v; |
109 | end++; |
110 | } |
111 | |
112 | count = end - vals; |
113 | if (!count) |
114 | return 0; |
115 | |
116 | if (handler->events) |
117 | handler->events(handle, vals, count); |
118 | else if (handler->event) |
119 | for (v = vals; v != end; v++) |
120 | handler->event(handle, v->type, v->code, v->value); |
121 | |
122 | return count; |
123 | } |
124 | |
125 | /* |
126 | * Pass values first through all filters and then, if event has not been |
127 | * filtered out, through all open handles. This function is called with |
128 | * dev->event_lock held and interrupts disabled. |
129 | */ |
130 | static void input_pass_values(struct input_dev *dev, |
131 | struct input_value *vals, unsigned int count) |
132 | { |
133 | struct input_handle *handle; |
134 | struct input_value *v; |
135 | |
136 | if (!count) |
137 | return; |
138 | |
139 | rcu_read_lock(); |
140 | |
141 | handle = rcu_dereference(dev->grab); |
142 | if (handle) { |
143 | count = input_to_handler(handle, vals, count); |
144 | } else { |
145 | list_for_each_entry_rcu(handle, &dev->h_list, d_node) |
146 | if (handle->open) |
147 | count = input_to_handler(handle, vals, count); |
148 | } |
149 | |
150 | rcu_read_unlock(); |
151 | |
152 | add_input_randomness(vals->type, vals->code, vals->value); |
153 | |
154 | /* trigger auto repeat for key events */ |
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 | } |
162 | } |
163 | } |
164 | |
165 | static void input_pass_event(struct input_dev *dev, |
166 | unsigned int type, unsigned int code, int value) |
167 | { |
168 | struct input_value vals[] = { { type, code, value } }; |
169 | |
170 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
171 | } |
172 | |
173 | /* |
174 | * Generate software autorepeat event. Note that we take |
175 | * dev->event_lock here to avoid racing with input_event |
176 | * which may cause keys get "stuck". |
177 | */ |
178 | static void input_repeat_key(unsigned long data) |
179 | { |
180 | struct input_dev *dev = (void *) data; |
181 | unsigned long flags; |
182 | |
183 | spin_lock_irqsave(&dev->event_lock, flags); |
184 | |
185 | if (test_bit(dev->repeat_key, dev->key) && |
186 | is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { |
187 | struct input_value vals[] = { |
188 | { EV_KEY, dev->repeat_key, 2 }, |
189 | input_value_sync |
190 | }; |
191 | |
192 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
193 | |
194 | if (dev->rep[REP_PERIOD]) |
195 | mod_timer(&dev->timer, jiffies + |
196 | msecs_to_jiffies(dev->rep[REP_PERIOD])); |
197 | } |
198 | |
199 | spin_unlock_irqrestore(&dev->event_lock, flags); |
200 | } |
201 | |
202 | #define INPUT_IGNORE_EVENT 0 |
203 | #define INPUT_PASS_TO_HANDLERS 1 |
204 | #define INPUT_PASS_TO_DEVICE 2 |
205 | #define INPUT_SLOT 4 |
206 | #define INPUT_FLUSH 8 |
207 | #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) |
208 | |
209 | static int input_handle_abs_event(struct input_dev *dev, |
210 | unsigned int code, int *pval) |
211 | { |
212 | struct input_mt *mt = dev->mt; |
213 | bool is_mt_event; |
214 | int *pold; |
215 | |
216 | if (code == ABS_MT_SLOT) { |
217 | /* |
218 | * "Stage" the event; we'll flush it later, when we |
219 | * get actual touch data. |
220 | */ |
221 | if (mt && *pval >= 0 && *pval < mt->num_slots) |
222 | mt->slot = *pval; |
223 | |
224 | return INPUT_IGNORE_EVENT; |
225 | } |
226 | |
227 | is_mt_event = input_is_mt_value(code); |
228 | |
229 | if (!is_mt_event) { |
230 | pold = &dev->absinfo[code].value; |
231 | } else if (mt) { |
232 | pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; |
233 | } else { |
234 | /* |
235 | * Bypass filtering for multi-touch events when |
236 | * not employing slots. |
237 | */ |
238 | pold = NULL; |
239 | } |
240 | |
241 | if (pold) { |
242 | *pval = input_defuzz_abs_event(*pval, *pold, |
243 | dev->absinfo[code].fuzz); |
244 | if (*pold == *pval) |
245 | return INPUT_IGNORE_EVENT; |
246 | |
247 | *pold = *pval; |
248 | } |
249 | |
250 | /* Flush pending "slot" event */ |
251 | if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { |
252 | input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); |
253 | return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; |
254 | } |
255 | |
256 | return INPUT_PASS_TO_HANDLERS; |
257 | } |
258 | |
259 | static int input_get_disposition(struct input_dev *dev, |
260 | unsigned int type, unsigned int code, int *pval) |
261 | { |
262 | int disposition = INPUT_IGNORE_EVENT; |
263 | int value = *pval; |
264 | |
265 | switch (type) { |
266 | |
267 | case EV_SYN: |
268 | switch (code) { |
269 | case SYN_CONFIG: |
270 | disposition = INPUT_PASS_TO_ALL; |
271 | break; |
272 | |
273 | case SYN_REPORT: |
274 | disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; |
275 | break; |
276 | case SYN_MT_REPORT: |
277 | disposition = INPUT_PASS_TO_HANDLERS; |
278 | break; |
279 | } |
280 | break; |
281 | |
282 | case EV_KEY: |
283 | if (is_event_supported(code, dev->keybit, KEY_MAX)) { |
284 | |
285 | /* auto-repeat bypasses state updates */ |
286 | if (value == 2) { |
287 | disposition = INPUT_PASS_TO_HANDLERS; |
288 | break; |
289 | } |
290 | |
291 | if (!!test_bit(code, dev->key) != !!value) { |
292 | |
293 | __change_bit(code, dev->key); |
294 | disposition = INPUT_PASS_TO_HANDLERS; |
295 | } |
296 | } |
297 | break; |
298 | |
299 | case EV_SW: |
300 | if (is_event_supported(code, dev->swbit, SW_MAX) && |
301 | !!test_bit(code, dev->sw) != !!value) { |
302 | |
303 | __change_bit(code, dev->sw); |
304 | disposition = INPUT_PASS_TO_HANDLERS; |
305 | } |
306 | break; |
307 | |
308 | case EV_ABS: |
309 | if (is_event_supported(code, dev->absbit, ABS_MAX)) |
310 | disposition = input_handle_abs_event(dev, code, &value); |
311 | |
312 | break; |
313 | |
314 | case EV_REL: |
315 | if (is_event_supported(code, dev->relbit, REL_MAX) && value) |
316 | disposition = INPUT_PASS_TO_HANDLERS; |
317 | |
318 | break; |
319 | |
320 | case EV_MSC: |
321 | if (is_event_supported(code, dev->mscbit, MSC_MAX)) |
322 | disposition = INPUT_PASS_TO_ALL; |
323 | |
324 | break; |
325 | |
326 | case EV_LED: |
327 | if (is_event_supported(code, dev->ledbit, LED_MAX) && |
328 | !!test_bit(code, dev->led) != !!value) { |
329 | |
330 | __change_bit(code, dev->led); |
331 | disposition = INPUT_PASS_TO_ALL; |
332 | } |
333 | break; |
334 | |
335 | case EV_SND: |
336 | if (is_event_supported(code, dev->sndbit, SND_MAX)) { |
337 | |
338 | if (!!test_bit(code, dev->snd) != !!value) |
339 | __change_bit(code, dev->snd); |
340 | disposition = INPUT_PASS_TO_ALL; |
341 | } |
342 | break; |
343 | |
344 | case EV_REP: |
345 | if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { |
346 | dev->rep[code] = value; |
347 | disposition = INPUT_PASS_TO_ALL; |
348 | } |
349 | break; |
350 | |
351 | case EV_FF: |
352 | if (value >= 0) |
353 | disposition = INPUT_PASS_TO_ALL; |
354 | break; |
355 | |
356 | case EV_PWR: |
357 | disposition = INPUT_PASS_TO_ALL; |
358 | break; |
359 | } |
360 | |
361 | *pval = value; |
362 | return disposition; |
363 | } |
364 | |
365 | static void input_handle_event(struct input_dev *dev, |
366 | unsigned int type, unsigned int code, int value) |
367 | { |
368 | int disposition; |
369 | |
370 | disposition = input_get_disposition(dev, type, code, &value); |
371 | |
372 | if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) |
373 | dev->event(dev, type, code, value); |
374 | |
375 | if (!dev->vals) |
376 | return; |
377 | |
378 | if (disposition & INPUT_PASS_TO_HANDLERS) { |
379 | struct input_value *v; |
380 | |
381 | if (disposition & INPUT_SLOT) { |
382 | v = &dev->vals[dev->num_vals++]; |
383 | v->type = EV_ABS; |
384 | v->code = ABS_MT_SLOT; |
385 | v->value = dev->mt->slot; |
386 | } |
387 | |
388 | v = &dev->vals[dev->num_vals++]; |
389 | v->type = type; |
390 | v->code = code; |
391 | v->value = value; |
392 | } |
393 | |
394 | if (disposition & INPUT_FLUSH) { |
395 | if (dev->num_vals >= 2) |
396 | input_pass_values(dev, dev->vals, dev->num_vals); |
397 | dev->num_vals = 0; |
398 | } else if (dev->num_vals >= dev->max_vals - 2) { |
399 | dev->vals[dev->num_vals++] = input_value_sync; |
400 | input_pass_values(dev, dev->vals, dev->num_vals); |
401 | dev->num_vals = 0; |
402 | } |
403 | |
404 | } |
405 | |
406 | /** |
407 | * input_event() - report new input event |
408 | * @dev: device that generated the event |
409 | * @type: type of the event |
410 | * @code: event code |
411 | * @value: value of the event |
412 | * |
413 | * This function should be used by drivers implementing various input |
414 | * devices to report input events. See also input_inject_event(). |
415 | * |
416 | * NOTE: input_event() may be safely used right after input device was |
417 | * allocated with input_allocate_device(), even before it is registered |
418 | * with input_register_device(), but the event will not reach any of the |
419 | * input handlers. Such early invocation of input_event() may be used |
420 | * to 'seed' initial state of a switch or initial position of absolute |
421 | * axis, etc. |
422 | */ |
423 | void input_event(struct input_dev *dev, |
424 | unsigned int type, unsigned int code, int value) |
425 | { |
426 | unsigned long flags; |
427 | |
428 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
429 | |
430 | spin_lock_irqsave(&dev->event_lock, flags); |
431 | input_handle_event(dev, type, code, value); |
432 | spin_unlock_irqrestore(&dev->event_lock, flags); |
433 | } |
434 | } |
435 | EXPORT_SYMBOL(input_event); |
436 | |
437 | /** |
438 | * input_inject_event() - send input event from input handler |
439 | * @handle: input handle to send event through |
440 | * @type: type of the event |
441 | * @code: event code |
442 | * @value: value of the event |
443 | * |
444 | * Similar to input_event() but will ignore event if device is |
445 | * "grabbed" and handle injecting event is not the one that owns |
446 | * the device. |
447 | */ |
448 | void input_inject_event(struct input_handle *handle, |
449 | unsigned int type, unsigned int code, int value) |
450 | { |
451 | struct input_dev *dev = handle->dev; |
452 | struct input_handle *grab; |
453 | unsigned long flags; |
454 | |
455 | if (is_event_supported(type, dev->evbit, EV_MAX)) { |
456 | spin_lock_irqsave(&dev->event_lock, flags); |
457 | |
458 | rcu_read_lock(); |
459 | grab = rcu_dereference(dev->grab); |
460 | if (!grab || grab == handle) |
461 | input_handle_event(dev, type, code, value); |
462 | rcu_read_unlock(); |
463 | |
464 | spin_unlock_irqrestore(&dev->event_lock, flags); |
465 | } |
466 | } |
467 | EXPORT_SYMBOL(input_inject_event); |
468 | |
469 | /** |
470 | * input_alloc_absinfo - allocates array of input_absinfo structs |
471 | * @dev: the input device emitting absolute events |
472 | * |
473 | * If the absinfo struct the caller asked for is already allocated, this |
474 | * functions will not do anything. |
475 | */ |
476 | void input_alloc_absinfo(struct input_dev *dev) |
477 | { |
478 | if (!dev->absinfo) |
479 | dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), |
480 | GFP_KERNEL); |
481 | |
482 | WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); |
483 | } |
484 | EXPORT_SYMBOL(input_alloc_absinfo); |
485 | |
486 | void input_set_abs_params(struct input_dev *dev, unsigned int axis, |
487 | int min, int max, int fuzz, int flat) |
488 | { |
489 | struct input_absinfo *absinfo; |
490 | |
491 | input_alloc_absinfo(dev); |
492 | if (!dev->absinfo) |
493 | return; |
494 | |
495 | absinfo = &dev->absinfo[axis]; |
496 | absinfo->minimum = min; |
497 | absinfo->maximum = max; |
498 | absinfo->fuzz = fuzz; |
499 | absinfo->flat = flat; |
500 | |
501 | __set_bit(EV_ABS, dev->evbit); |
502 | __set_bit(axis, dev->absbit); |
503 | } |
504 | EXPORT_SYMBOL(input_set_abs_params); |
505 | |
506 | |
507 | /** |
508 | * input_grab_device - grabs device for exclusive use |
509 | * @handle: input handle that wants to own the device |
510 | * |
511 | * When a device is grabbed by an input handle all events generated by |
512 | * the device are delivered only to this handle. Also events injected |
513 | * by other input handles are ignored while device is grabbed. |
514 | */ |
515 | int input_grab_device(struct input_handle *handle) |
516 | { |
517 | struct input_dev *dev = handle->dev; |
518 | int retval; |
519 | |
520 | retval = mutex_lock_interruptible(&dev->mutex); |
521 | if (retval) |
522 | return retval; |
523 | |
524 | if (dev->grab) { |
525 | retval = -EBUSY; |
526 | goto out; |
527 | } |
528 | |
529 | rcu_assign_pointer(dev->grab, handle); |
530 | |
531 | out: |
532 | mutex_unlock(&dev->mutex); |
533 | return retval; |
534 | } |
535 | EXPORT_SYMBOL(input_grab_device); |
536 | |
537 | static void __input_release_device(struct input_handle *handle) |
538 | { |
539 | struct input_dev *dev = handle->dev; |
540 | struct input_handle *grabber; |
541 | |
542 | grabber = rcu_dereference_protected(dev->grab, |
543 | lockdep_is_held(&dev->mutex)); |
544 | if (grabber == handle) { |
545 | rcu_assign_pointer(dev->grab, NULL); |
546 | /* Make sure input_pass_event() notices that grab is gone */ |
547 | synchronize_rcu(); |
548 | |
549 | list_for_each_entry(handle, &dev->h_list, d_node) |
550 | if (handle->open && handle->handler->start) |
551 | handle->handler->start(handle); |
552 | } |
553 | } |
554 | |
555 | /** |
556 | * input_release_device - release previously grabbed device |
557 | * @handle: input handle that owns the device |
558 | * |
559 | * Releases previously grabbed device so that other input handles can |
560 | * start receiving input events. Upon release all handlers attached |
561 | * to the device have their start() method called so they have a change |
562 | * to synchronize device state with the rest of the system. |
563 | */ |
564 | void input_release_device(struct input_handle *handle) |
565 | { |
566 | struct input_dev *dev = handle->dev; |
567 | |
568 | mutex_lock(&dev->mutex); |
569 | __input_release_device(handle); |
570 | mutex_unlock(&dev->mutex); |
571 | } |
572 | EXPORT_SYMBOL(input_release_device); |
573 | |
574 | /** |
575 | * input_open_device - open input device |
576 | * @handle: handle through which device is being accessed |
577 | * |
578 | * This function should be called by input handlers when they |
579 | * want to start receive events from given input device. |
580 | */ |
581 | int input_open_device(struct input_handle *handle) |
582 | { |
583 | struct input_dev *dev = handle->dev; |
584 | int retval; |
585 | |
586 | retval = mutex_lock_interruptible(&dev->mutex); |
587 | if (retval) |
588 | return retval; |
589 | |
590 | if (dev->going_away) { |
591 | retval = -ENODEV; |
592 | goto out; |
593 | } |
594 | |
595 | handle->open++; |
596 | |
597 | if (!dev->users++ && dev->open) |
598 | retval = dev->open(dev); |
599 | |
600 | if (retval) { |
601 | dev->users--; |
602 | if (!--handle->open) { |
603 | /* |
604 | * Make sure we are not delivering any more events |
605 | * through this handle |
606 | */ |
607 | synchronize_rcu(); |
608 | } |
609 | } |
610 | |
611 | out: |
612 | mutex_unlock(&dev->mutex); |
613 | return retval; |
614 | } |
615 | EXPORT_SYMBOL(input_open_device); |
616 | |
617 | int input_flush_device(struct input_handle *handle, struct file *file) |
618 | { |
619 | struct input_dev *dev = handle->dev; |
620 | int retval; |
621 | |
622 | retval = mutex_lock_interruptible(&dev->mutex); |
623 | if (retval) |
624 | return retval; |
625 | |
626 | if (dev->flush) |
627 | retval = dev->flush(dev, file); |
628 | |
629 | mutex_unlock(&dev->mutex); |
630 | return retval; |
631 | } |
632 | EXPORT_SYMBOL(input_flush_device); |
633 | |
634 | /** |
635 | * input_close_device - close input device |
636 | * @handle: handle through which device is being accessed |
637 | * |
638 | * This function should be called by input handlers when they |
639 | * want to stop receive events from given input device. |
640 | */ |
641 | void input_close_device(struct input_handle *handle) |
642 | { |
643 | struct input_dev *dev = handle->dev; |
644 | |
645 | mutex_lock(&dev->mutex); |
646 | |
647 | __input_release_device(handle); |
648 | |
649 | if (!--dev->users && dev->close) |
650 | dev->close(dev); |
651 | |
652 | if (!--handle->open) { |
653 | /* |
654 | * synchronize_rcu() makes sure that input_pass_event() |
655 | * completed and that no more input events are delivered |
656 | * through this handle |
657 | */ |
658 | synchronize_rcu(); |
659 | } |
660 | |
661 | mutex_unlock(&dev->mutex); |
662 | } |
663 | EXPORT_SYMBOL(input_close_device); |
664 | |
665 | /* |
666 | * Simulate keyup events for all keys that are marked as pressed. |
667 | * The function must be called with dev->event_lock held. |
668 | */ |
669 | static void input_dev_release_keys(struct input_dev *dev) |
670 | { |
671 | int code; |
672 | |
673 | if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) { |
674 | for (code = 0; code <= KEY_MAX; code++) { |
675 | if (is_event_supported(code, dev->keybit, KEY_MAX) && |
676 | __test_and_clear_bit(code, dev->key)) { |
677 | input_pass_event(dev, EV_KEY, code, 0); |
678 | } |
679 | } |
680 | input_pass_event(dev, EV_SYN, SYN_REPORT, 1); |
681 | } |
682 | } |
683 | |
684 | /* |
685 | * Prepare device for unregistering |
686 | */ |
687 | static void input_disconnect_device(struct input_dev *dev) |
688 | { |
689 | struct input_handle *handle; |
690 | |
691 | /* |
692 | * Mark device as going away. Note that we take dev->mutex here |
693 | * not to protect access to dev->going_away but rather to ensure |
694 | * that there are no threads in the middle of input_open_device() |
695 | */ |
696 | mutex_lock(&dev->mutex); |
697 | dev->going_away = true; |
698 | mutex_unlock(&dev->mutex); |
699 | |
700 | spin_lock_irq(&dev->event_lock); |
701 | |
702 | /* |
703 | * Simulate keyup events for all pressed keys so that handlers |
704 | * are not left with "stuck" keys. The driver may continue |
705 | * generate events even after we done here but they will not |
706 | * reach any handlers. |
707 | */ |
708 | input_dev_release_keys(dev); |
709 | |
710 | list_for_each_entry(handle, &dev->h_list, d_node) |
711 | handle->open = 0; |
712 | |
713 | spin_unlock_irq(&dev->event_lock); |
714 | } |
715 | |
716 | /** |
717 | * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry |
718 | * @ke: keymap entry containing scancode to be converted. |
719 | * @scancode: pointer to the location where converted scancode should |
720 | * be stored. |
721 | * |
722 | * This function is used to convert scancode stored in &struct keymap_entry |
723 | * into scalar form understood by legacy keymap handling methods. These |
724 | * methods expect scancodes to be represented as 'unsigned int'. |
725 | */ |
726 | int input_scancode_to_scalar(const struct input_keymap_entry *ke, |
727 | unsigned int *scancode) |
728 | { |
729 | switch (ke->len) { |
730 | case 1: |
731 | *scancode = *((u8 *)ke->scancode); |
732 | break; |
733 | |
734 | case 2: |
735 | *scancode = *((u16 *)ke->scancode); |
736 | break; |
737 | |
738 | case 4: |
739 | *scancode = *((u32 *)ke->scancode); |
740 | break; |
741 | |
742 | default: |
743 | return -EINVAL; |
744 | } |
745 | |
746 | return 0; |
747 | } |
748 | EXPORT_SYMBOL(input_scancode_to_scalar); |
749 | |
750 | /* |
751 | * Those routines handle the default case where no [gs]etkeycode() is |
752 | * defined. In this case, an array indexed by the scancode is used. |
753 | */ |
754 | |
755 | static unsigned int input_fetch_keycode(struct input_dev *dev, |
756 | unsigned int index) |
757 | { |
758 | switch (dev->keycodesize) { |
759 | case 1: |
760 | return ((u8 *)dev->keycode)[index]; |
761 | |
762 | case 2: |
763 | return ((u16 *)dev->keycode)[index]; |
764 | |
765 | default: |
766 | return ((u32 *)dev->keycode)[index]; |
767 | } |
768 | } |
769 | |
770 | static int input_default_getkeycode(struct input_dev *dev, |
771 | struct input_keymap_entry *ke) |
772 | { |
773 | unsigned int index; |
774 | int error; |
775 | |
776 | if (!dev->keycodesize) |
777 | return -EINVAL; |
778 | |
779 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) |
780 | index = ke->index; |
781 | else { |
782 | error = input_scancode_to_scalar(ke, &index); |
783 | if (error) |
784 | return error; |
785 | } |
786 | |
787 | if (index >= dev->keycodemax) |
788 | return -EINVAL; |
789 | |
790 | ke->keycode = input_fetch_keycode(dev, index); |
791 | ke->index = index; |
792 | ke->len = sizeof(index); |
793 | memcpy(ke->scancode, &index, sizeof(index)); |
794 | |
795 | return 0; |
796 | } |
797 | |
798 | static int input_default_setkeycode(struct input_dev *dev, |
799 | const struct input_keymap_entry *ke, |
800 | unsigned int *old_keycode) |
801 | { |
802 | unsigned int index; |
803 | int error; |
804 | int i; |
805 | |
806 | if (!dev->keycodesize) |
807 | return -EINVAL; |
808 | |
809 | if (ke->flags & INPUT_KEYMAP_BY_INDEX) { |
810 | index = ke->index; |
811 | } else { |
812 | error = input_scancode_to_scalar(ke, &index); |
813 | if (error) |
814 | return error; |
815 | } |
816 | |
817 | if (index >= dev->keycodemax) |
818 | return -EINVAL; |
819 | |
820 | if (dev->keycodesize < sizeof(ke->keycode) && |
821 | (ke->keycode >> (dev->keycodesize * 8))) |
822 | return -EINVAL; |
823 | |
824 | switch (dev->keycodesize) { |
825 | case 1: { |
826 | u8 *k = (u8 *)dev->keycode; |
827 | *old_keycode = k[index]; |
828 | k[index] = ke->keycode; |
829 | break; |
830 | } |
831 | case 2: { |
832 | u16 *k = (u16 *)dev->keycode; |
833 | *old_keycode = k[index]; |
834 | k[index] = ke->keycode; |
835 | break; |
836 | } |
837 | default: { |
838 | u32 *k = (u32 *)dev->keycode; |
839 | *old_keycode = k[index]; |
840 | k[index] = ke->keycode; |
841 | break; |
842 | } |
843 | } |
844 | |
845 | __clear_bit(*old_keycode, dev->keybit); |
846 | __set_bit(ke->keycode, dev->keybit); |
847 | |
848 | for (i = 0; i < dev->keycodemax; i++) { |
849 | if (input_fetch_keycode(dev, i) == *old_keycode) { |
850 | __set_bit(*old_keycode, dev->keybit); |
851 | break; /* Setting the bit twice is useless, so break */ |
852 | } |
853 | } |
854 | |
855 | return 0; |
856 | } |
857 | |
858 | /** |
859 | * input_get_keycode - retrieve keycode currently mapped to a given scancode |
860 | * @dev: input device which keymap is being queried |
861 | * @ke: keymap entry |
862 | * |
863 | * This function should be called by anyone interested in retrieving current |
864 | * keymap. Presently evdev handlers use it. |
865 | */ |
866 | int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) |
867 | { |
868 | unsigned long flags; |
869 | int retval; |
870 | |
871 | spin_lock_irqsave(&dev->event_lock, flags); |
872 | retval = dev->getkeycode(dev, ke); |
873 | spin_unlock_irqrestore(&dev->event_lock, flags); |
874 | |
875 | return retval; |
876 | } |
877 | EXPORT_SYMBOL(input_get_keycode); |
878 | |
879 | /** |
880 | * input_set_keycode - attribute a keycode to a given scancode |
881 | * @dev: input device which keymap is being updated |
882 | * @ke: new keymap entry |
883 | * |
884 | * This function should be called by anyone needing to update current |
885 | * keymap. Presently keyboard and evdev handlers use it. |
886 | */ |
887 | int input_set_keycode(struct input_dev *dev, |
888 | const struct input_keymap_entry *ke) |
889 | { |
890 | unsigned long flags; |
891 | unsigned int old_keycode; |
892 | int retval; |
893 | |
894 | if (ke->keycode > KEY_MAX) |
895 | return -EINVAL; |
896 | |
897 | spin_lock_irqsave(&dev->event_lock, flags); |
898 | |
899 | retval = dev->setkeycode(dev, ke, &old_keycode); |
900 | if (retval) |
901 | goto out; |
902 | |
903 | /* Make sure KEY_RESERVED did not get enabled. */ |
904 | __clear_bit(KEY_RESERVED, dev->keybit); |
905 | |
906 | /* |
907 | * Simulate keyup event if keycode is not present |
908 | * in the keymap anymore |
909 | */ |
910 | if (test_bit(EV_KEY, dev->evbit) && |
911 | !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && |
912 | __test_and_clear_bit(old_keycode, dev->key)) { |
913 | struct input_value vals[] = { |
914 | { EV_KEY, old_keycode, 0 }, |
915 | input_value_sync |
916 | }; |
917 | |
918 | input_pass_values(dev, vals, ARRAY_SIZE(vals)); |
919 | } |
920 | |
921 | out: |
922 | spin_unlock_irqrestore(&dev->event_lock, flags); |
923 | |
924 | return retval; |
925 | } |
926 | EXPORT_SYMBOL(input_set_keycode); |
927 | |
928 | static const struct input_device_id *input_match_device(struct input_handler *handler, |
929 | struct input_dev *dev) |
930 | { |
931 | const struct input_device_id *id; |
932 | |
933 | for (id = handler->id_table; id->flags || id->driver_info; id++) { |
934 | |
935 | if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) |
936 | if (id->bustype != dev->id.bustype) |
937 | continue; |
938 | |
939 | if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) |
940 | if (id->vendor != dev->id.vendor) |
941 | continue; |
942 | |
943 | if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) |
944 | if (id->product != dev->id.product) |
945 | continue; |
946 | |
947 | if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) |
948 | if (id->version != dev->id.version) |
949 | continue; |
950 | |
951 | if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX)) |
952 | continue; |
953 | |
954 | if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX)) |
955 | continue; |
956 | |
957 | if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX)) |
958 | continue; |
959 | |
960 | if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX)) |
961 | continue; |
962 | |
963 | if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX)) |
964 | continue; |
965 | |
966 | if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX)) |
967 | continue; |
968 | |
969 | if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX)) |
970 | continue; |
971 | |
972 | if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX)) |
973 | continue; |
974 | |
975 | if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX)) |
976 | continue; |
977 | |
978 | if (!handler->match || handler->match(handler, dev)) |
979 | return id; |
980 | } |
981 | |
982 | return NULL; |
983 | } |
984 | |
985 | static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) |
986 | { |
987 | const struct input_device_id *id; |
988 | int error; |
989 | |
990 | id = input_match_device(handler, dev); |
991 | if (!id) |
992 | return -ENODEV; |
993 | |
994 | error = handler->connect(handler, dev, id); |
995 | if (error && error != -ENODEV) |
996 | pr_err("failed to attach handler %s to device %s, error: %d\n", |
997 | handler->name, kobject_name(&dev->dev.kobj), error); |
998 | |
999 | return error; |
1000 | } |
1001 | |
1002 | #ifdef CONFIG_COMPAT |
1003 | |
1004 | static int input_bits_to_string(char *buf, int buf_size, |
1005 | unsigned long bits, bool skip_empty) |
1006 | { |
1007 | int len = 0; |
1008 | |
1009 | if (INPUT_COMPAT_TEST) { |
1010 | u32 dword = bits >> 32; |
1011 | if (dword || !skip_empty) |
1012 | len += snprintf(buf, buf_size, "%x ", dword); |
1013 | |
1014 | dword = bits & 0xffffffffUL; |
1015 | if (dword || !skip_empty || len) |
1016 | len += snprintf(buf + len, max(buf_size - len, 0), |
1017 | "%x", dword); |
1018 | } else { |
1019 | if (bits || !skip_empty) |
1020 | len += snprintf(buf, buf_size, "%lx", bits); |
1021 | } |
1022 | |
1023 | return len; |
1024 | } |
1025 | |
1026 | #else /* !CONFIG_COMPAT */ |
1027 | |
1028 | static int input_bits_to_string(char *buf, int buf_size, |
1029 | unsigned long bits, bool skip_empty) |
1030 | { |
1031 | return bits || !skip_empty ? |
1032 | snprintf(buf, buf_size, "%lx", bits) : 0; |
1033 | } |
1034 | |
1035 | #endif |
1036 | |
1037 | #ifdef CONFIG_PROC_FS |
1038 | |
1039 | static struct proc_dir_entry *proc_bus_input_dir; |
1040 | static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); |
1041 | static int input_devices_state; |
1042 | |
1043 | static inline void input_wakeup_procfs_readers(void) |
1044 | { |
1045 | input_devices_state++; |
1046 | wake_up(&input_devices_poll_wait); |
1047 | } |
1048 | |
1049 | static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait) |
1050 | { |
1051 | poll_wait(file, &input_devices_poll_wait, wait); |
1052 | if (file->f_version != input_devices_state) { |
1053 | file->f_version = input_devices_state; |
1054 | return POLLIN | POLLRDNORM; |
1055 | } |
1056 | |
1057 | return 0; |
1058 | } |
1059 | |
1060 | union input_seq_state { |
1061 | struct { |
1062 | unsigned short pos; |
1063 | bool mutex_acquired; |
1064 | }; |
1065 | void *p; |
1066 | }; |
1067 | |
1068 | static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) |
1069 | { |
1070 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1071 | int error; |
1072 | |
1073 | /* We need to fit into seq->private pointer */ |
1074 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); |
1075 | |
1076 | error = mutex_lock_interruptible(&input_mutex); |
1077 | if (error) { |
1078 | state->mutex_acquired = false; |
1079 | return ERR_PTR(error); |
1080 | } |
1081 | |
1082 | state->mutex_acquired = true; |
1083 | |
1084 | return seq_list_start(&input_dev_list, *pos); |
1085 | } |
1086 | |
1087 | static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1088 | { |
1089 | return seq_list_next(v, &input_dev_list, pos); |
1090 | } |
1091 | |
1092 | static void input_seq_stop(struct seq_file *seq, void *v) |
1093 | { |
1094 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1095 | |
1096 | if (state->mutex_acquired) |
1097 | mutex_unlock(&input_mutex); |
1098 | } |
1099 | |
1100 | static void input_seq_print_bitmap(struct seq_file *seq, const char *name, |
1101 | unsigned long *bitmap, int max) |
1102 | { |
1103 | int i; |
1104 | bool skip_empty = true; |
1105 | char buf[18]; |
1106 | |
1107 | seq_printf(seq, "B: %s=", name); |
1108 | |
1109 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { |
1110 | if (input_bits_to_string(buf, sizeof(buf), |
1111 | bitmap[i], skip_empty)) { |
1112 | skip_empty = false; |
1113 | seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); |
1114 | } |
1115 | } |
1116 | |
1117 | /* |
1118 | * If no output was produced print a single 0. |
1119 | */ |
1120 | if (skip_empty) |
1121 | seq_puts(seq, "0"); |
1122 | |
1123 | seq_putc(seq, '\n'); |
1124 | } |
1125 | |
1126 | static int input_devices_seq_show(struct seq_file *seq, void *v) |
1127 | { |
1128 | struct input_dev *dev = container_of(v, struct input_dev, node); |
1129 | const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
1130 | struct input_handle *handle; |
1131 | |
1132 | seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", |
1133 | dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); |
1134 | |
1135 | seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); |
1136 | seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); |
1137 | seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); |
1138 | seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : ""); |
1139 | seq_printf(seq, "H: Handlers="); |
1140 | |
1141 | list_for_each_entry(handle, &dev->h_list, d_node) |
1142 | seq_printf(seq, "%s ", handle->name); |
1143 | seq_putc(seq, '\n'); |
1144 | |
1145 | input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); |
1146 | |
1147 | input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); |
1148 | if (test_bit(EV_KEY, dev->evbit)) |
1149 | input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); |
1150 | if (test_bit(EV_REL, dev->evbit)) |
1151 | input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); |
1152 | if (test_bit(EV_ABS, dev->evbit)) |
1153 | input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); |
1154 | if (test_bit(EV_MSC, dev->evbit)) |
1155 | input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); |
1156 | if (test_bit(EV_LED, dev->evbit)) |
1157 | input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); |
1158 | if (test_bit(EV_SND, dev->evbit)) |
1159 | input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); |
1160 | if (test_bit(EV_FF, dev->evbit)) |
1161 | input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); |
1162 | if (test_bit(EV_SW, dev->evbit)) |
1163 | input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); |
1164 | |
1165 | seq_putc(seq, '\n'); |
1166 | |
1167 | kfree(path); |
1168 | return 0; |
1169 | } |
1170 | |
1171 | static const struct seq_operations input_devices_seq_ops = { |
1172 | .start = input_devices_seq_start, |
1173 | .next = input_devices_seq_next, |
1174 | .stop = input_seq_stop, |
1175 | .show = input_devices_seq_show, |
1176 | }; |
1177 | |
1178 | static int input_proc_devices_open(struct inode *inode, struct file *file) |
1179 | { |
1180 | return seq_open(file, &input_devices_seq_ops); |
1181 | } |
1182 | |
1183 | static const struct file_operations input_devices_fileops = { |
1184 | .owner = THIS_MODULE, |
1185 | .open = input_proc_devices_open, |
1186 | .poll = input_proc_devices_poll, |
1187 | .read = seq_read, |
1188 | .llseek = seq_lseek, |
1189 | .release = seq_release, |
1190 | }; |
1191 | |
1192 | static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) |
1193 | { |
1194 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1195 | int error; |
1196 | |
1197 | /* We need to fit into seq->private pointer */ |
1198 | BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); |
1199 | |
1200 | error = mutex_lock_interruptible(&input_mutex); |
1201 | if (error) { |
1202 | state->mutex_acquired = false; |
1203 | return ERR_PTR(error); |
1204 | } |
1205 | |
1206 | state->mutex_acquired = true; |
1207 | state->pos = *pos; |
1208 | |
1209 | return seq_list_start(&input_handler_list, *pos); |
1210 | } |
1211 | |
1212 | static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1213 | { |
1214 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1215 | |
1216 | state->pos = *pos + 1; |
1217 | return seq_list_next(v, &input_handler_list, pos); |
1218 | } |
1219 | |
1220 | static int input_handlers_seq_show(struct seq_file *seq, void *v) |
1221 | { |
1222 | struct input_handler *handler = container_of(v, struct input_handler, node); |
1223 | union input_seq_state *state = (union input_seq_state *)&seq->private; |
1224 | |
1225 | seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); |
1226 | if (handler->filter) |
1227 | seq_puts(seq, " (filter)"); |
1228 | if (handler->legacy_minors) |
1229 | seq_printf(seq, " Minor=%d", handler->minor); |
1230 | seq_putc(seq, '\n'); |
1231 | |
1232 | return 0; |
1233 | } |
1234 | |
1235 | static const struct seq_operations input_handlers_seq_ops = { |
1236 | .start = input_handlers_seq_start, |
1237 | .next = input_handlers_seq_next, |
1238 | .stop = input_seq_stop, |
1239 | .show = input_handlers_seq_show, |
1240 | }; |
1241 | |
1242 | static int input_proc_handlers_open(struct inode *inode, struct file *file) |
1243 | { |
1244 | return seq_open(file, &input_handlers_seq_ops); |
1245 | } |
1246 | |
1247 | static const struct file_operations input_handlers_fileops = { |
1248 | .owner = THIS_MODULE, |
1249 | .open = input_proc_handlers_open, |
1250 | .read = seq_read, |
1251 | .llseek = seq_lseek, |
1252 | .release = seq_release, |
1253 | }; |
1254 | |
1255 | static int __init input_proc_init(void) |
1256 | { |
1257 | struct proc_dir_entry *entry; |
1258 | |
1259 | proc_bus_input_dir = proc_mkdir("bus/input", NULL); |
1260 | if (!proc_bus_input_dir) |
1261 | return -ENOMEM; |
1262 | |
1263 | entry = proc_create("devices", 0, proc_bus_input_dir, |
1264 | &input_devices_fileops); |
1265 | if (!entry) |
1266 | goto fail1; |
1267 | |
1268 | entry = proc_create("handlers", 0, proc_bus_input_dir, |
1269 | &input_handlers_fileops); |
1270 | if (!entry) |
1271 | goto fail2; |
1272 | |
1273 | return 0; |
1274 | |
1275 | fail2: remove_proc_entry("devices", proc_bus_input_dir); |
1276 | fail1: remove_proc_entry("bus/input", NULL); |
1277 | return -ENOMEM; |
1278 | } |
1279 | |
1280 | static void input_proc_exit(void) |
1281 | { |
1282 | remove_proc_entry("devices", proc_bus_input_dir); |
1283 | remove_proc_entry("handlers", proc_bus_input_dir); |
1284 | remove_proc_entry("bus/input", NULL); |
1285 | } |
1286 | |
1287 | #else /* !CONFIG_PROC_FS */ |
1288 | static inline void input_wakeup_procfs_readers(void) { } |
1289 | static inline int input_proc_init(void) { return 0; } |
1290 | static inline void input_proc_exit(void) { } |
1291 | #endif |
1292 | |
1293 | #define INPUT_DEV_STRING_ATTR_SHOW(name) \ |
1294 | static ssize_t input_dev_show_##name(struct device *dev, \ |
1295 | struct device_attribute *attr, \ |
1296 | char *buf) \ |
1297 | { \ |
1298 | struct input_dev *input_dev = to_input_dev(dev); \ |
1299 | \ |
1300 | return scnprintf(buf, PAGE_SIZE, "%s\n", \ |
1301 | input_dev->name ? input_dev->name : ""); \ |
1302 | } \ |
1303 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL) |
1304 | |
1305 | INPUT_DEV_STRING_ATTR_SHOW(name); |
1306 | INPUT_DEV_STRING_ATTR_SHOW(phys); |
1307 | INPUT_DEV_STRING_ATTR_SHOW(uniq); |
1308 | |
1309 | static int input_print_modalias_bits(char *buf, int size, |
1310 | char name, unsigned long *bm, |
1311 | unsigned int min_bit, unsigned int max_bit) |
1312 | { |
1313 | int len = 0, i; |
1314 | |
1315 | len += snprintf(buf, max(size, 0), "%c", name); |
1316 | for (i = min_bit; i < max_bit; i++) |
1317 | if (bm[BIT_WORD(i)] & BIT_MASK(i)) |
1318 | len += snprintf(buf + len, max(size - len, 0), "%X,", i); |
1319 | return len; |
1320 | } |
1321 | |
1322 | static int input_print_modalias(char *buf, int size, struct input_dev *id, |
1323 | int add_cr) |
1324 | { |
1325 | int len; |
1326 | |
1327 | len = snprintf(buf, max(size, 0), |
1328 | "input:b%04Xv%04Xp%04Xe%04X-", |
1329 | id->id.bustype, id->id.vendor, |
1330 | id->id.product, id->id.version); |
1331 | |
1332 | len += input_print_modalias_bits(buf + len, size - len, |
1333 | 'e', id->evbit, 0, EV_MAX); |
1334 | len += input_print_modalias_bits(buf + len, size - len, |
1335 | 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); |
1336 | len += input_print_modalias_bits(buf + len, size - len, |
1337 | 'r', id->relbit, 0, REL_MAX); |
1338 | len += input_print_modalias_bits(buf + len, size - len, |
1339 | 'a', id->absbit, 0, ABS_MAX); |
1340 | len += input_print_modalias_bits(buf + len, size - len, |
1341 | 'm', id->mscbit, 0, MSC_MAX); |
1342 | len += input_print_modalias_bits(buf + len, size - len, |
1343 | 'l', id->ledbit, 0, LED_MAX); |
1344 | len += input_print_modalias_bits(buf + len, size - len, |
1345 | 's', id->sndbit, 0, SND_MAX); |
1346 | len += input_print_modalias_bits(buf + len, size - len, |
1347 | 'f', id->ffbit, 0, FF_MAX); |
1348 | len += input_print_modalias_bits(buf + len, size - len, |
1349 | 'w', id->swbit, 0, SW_MAX); |
1350 | |
1351 | if (add_cr) |
1352 | len += snprintf(buf + len, max(size - len, 0), "\n"); |
1353 | |
1354 | return len; |
1355 | } |
1356 | |
1357 | static ssize_t input_dev_show_modalias(struct device *dev, |
1358 | struct device_attribute *attr, |
1359 | char *buf) |
1360 | { |
1361 | struct input_dev *id = to_input_dev(dev); |
1362 | ssize_t len; |
1363 | |
1364 | len = input_print_modalias(buf, PAGE_SIZE, id, 1); |
1365 | |
1366 | return min_t(int, len, PAGE_SIZE); |
1367 | } |
1368 | static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); |
1369 | |
1370 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1371 | int max, int add_cr); |
1372 | |
1373 | static ssize_t input_dev_show_properties(struct device *dev, |
1374 | struct device_attribute *attr, |
1375 | char *buf) |
1376 | { |
1377 | struct input_dev *input_dev = to_input_dev(dev); |
1378 | int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit, |
1379 | INPUT_PROP_MAX, true); |
1380 | return min_t(int, len, PAGE_SIZE); |
1381 | } |
1382 | static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); |
1383 | |
1384 | static struct attribute *input_dev_attrs[] = { |
1385 | &dev_attr_name.attr, |
1386 | &dev_attr_phys.attr, |
1387 | &dev_attr_uniq.attr, |
1388 | &dev_attr_modalias.attr, |
1389 | &dev_attr_properties.attr, |
1390 | NULL |
1391 | }; |
1392 | |
1393 | static struct attribute_group input_dev_attr_group = { |
1394 | .attrs = input_dev_attrs, |
1395 | }; |
1396 | |
1397 | #define INPUT_DEV_ID_ATTR(name) \ |
1398 | static ssize_t input_dev_show_id_##name(struct device *dev, \ |
1399 | struct device_attribute *attr, \ |
1400 | char *buf) \ |
1401 | { \ |
1402 | struct input_dev *input_dev = to_input_dev(dev); \ |
1403 | return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ |
1404 | } \ |
1405 | static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL) |
1406 | |
1407 | INPUT_DEV_ID_ATTR(bustype); |
1408 | INPUT_DEV_ID_ATTR(vendor); |
1409 | INPUT_DEV_ID_ATTR(product); |
1410 | INPUT_DEV_ID_ATTR(version); |
1411 | |
1412 | static struct attribute *input_dev_id_attrs[] = { |
1413 | &dev_attr_bustype.attr, |
1414 | &dev_attr_vendor.attr, |
1415 | &dev_attr_product.attr, |
1416 | &dev_attr_version.attr, |
1417 | NULL |
1418 | }; |
1419 | |
1420 | static struct attribute_group input_dev_id_attr_group = { |
1421 | .name = "id", |
1422 | .attrs = input_dev_id_attrs, |
1423 | }; |
1424 | |
1425 | static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, |
1426 | int max, int add_cr) |
1427 | { |
1428 | int i; |
1429 | int len = 0; |
1430 | bool skip_empty = true; |
1431 | |
1432 | for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { |
1433 | len += input_bits_to_string(buf + len, max(buf_size - len, 0), |
1434 | bitmap[i], skip_empty); |
1435 | if (len) { |
1436 | skip_empty = false; |
1437 | if (i > 0) |
1438 | len += snprintf(buf + len, max(buf_size - len, 0), " "); |
1439 | } |
1440 | } |
1441 | |
1442 | /* |
1443 | * If no output was produced print a single 0. |
1444 | */ |
1445 | if (len == 0) |
1446 | len = snprintf(buf, buf_size, "%d", 0); |
1447 | |
1448 | if (add_cr) |
1449 | len += snprintf(buf + len, max(buf_size - len, 0), "\n"); |
1450 | |
1451 | return len; |
1452 | } |
1453 | |
1454 | #define INPUT_DEV_CAP_ATTR(ev, bm) \ |
1455 | static ssize_t input_dev_show_cap_##bm(struct device *dev, \ |
1456 | struct device_attribute *attr, \ |
1457 | char *buf) \ |
1458 | { \ |
1459 | struct input_dev *input_dev = to_input_dev(dev); \ |
1460 | int len = input_print_bitmap(buf, PAGE_SIZE, \ |
1461 | input_dev->bm##bit, ev##_MAX, \ |
1462 | true); \ |
1463 | return min_t(int, len, PAGE_SIZE); \ |
1464 | } \ |
1465 | static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) |
1466 | |
1467 | INPUT_DEV_CAP_ATTR(EV, ev); |
1468 | INPUT_DEV_CAP_ATTR(KEY, key); |
1469 | INPUT_DEV_CAP_ATTR(REL, rel); |
1470 | INPUT_DEV_CAP_ATTR(ABS, abs); |
1471 | INPUT_DEV_CAP_ATTR(MSC, msc); |
1472 | INPUT_DEV_CAP_ATTR(LED, led); |
1473 | INPUT_DEV_CAP_ATTR(SND, snd); |
1474 | INPUT_DEV_CAP_ATTR(FF, ff); |
1475 | INPUT_DEV_CAP_ATTR(SW, sw); |
1476 | |
1477 | static struct attribute *input_dev_caps_attrs[] = { |
1478 | &dev_attr_ev.attr, |
1479 | &dev_attr_key.attr, |
1480 | &dev_attr_rel.attr, |
1481 | &dev_attr_abs.attr, |
1482 | &dev_attr_msc.attr, |
1483 | &dev_attr_led.attr, |
1484 | &dev_attr_snd.attr, |
1485 | &dev_attr_ff.attr, |
1486 | &dev_attr_sw.attr, |
1487 | NULL |
1488 | }; |
1489 | |
1490 | static struct attribute_group input_dev_caps_attr_group = { |
1491 | .name = "capabilities", |
1492 | .attrs = input_dev_caps_attrs, |
1493 | }; |
1494 | |
1495 | static const struct attribute_group *input_dev_attr_groups[] = { |
1496 | &input_dev_attr_group, |
1497 | &input_dev_id_attr_group, |
1498 | &input_dev_caps_attr_group, |
1499 | NULL |
1500 | }; |
1501 | |
1502 | static void input_dev_release(struct device *device) |
1503 | { |
1504 | struct input_dev *dev = to_input_dev(device); |
1505 | |
1506 | input_ff_destroy(dev); |
1507 | input_mt_destroy_slots(dev); |
1508 | kfree(dev->absinfo); |
1509 | kfree(dev->vals); |
1510 | kfree(dev); |
1511 | |
1512 | module_put(THIS_MODULE); |
1513 | } |
1514 | |
1515 | /* |
1516 | * Input uevent interface - loading event handlers based on |
1517 | * device bitfields. |
1518 | */ |
1519 | static int input_add_uevent_bm_var(struct kobj_uevent_env *env, |
1520 | const char *name, unsigned long *bitmap, int max) |
1521 | { |
1522 | int len; |
1523 | |
1524 | if (add_uevent_var(env, "%s", name)) |
1525 | return -ENOMEM; |
1526 | |
1527 | len = input_print_bitmap(&env->buf[env->buflen - 1], |
1528 | sizeof(env->buf) - env->buflen, |
1529 | bitmap, max, false); |
1530 | if (len >= (sizeof(env->buf) - env->buflen)) |
1531 | return -ENOMEM; |
1532 | |
1533 | env->buflen += len; |
1534 | return 0; |
1535 | } |
1536 | |
1537 | static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, |
1538 | struct input_dev *dev) |
1539 | { |
1540 | int len; |
1541 | |
1542 | if (add_uevent_var(env, "MODALIAS=")) |
1543 | return -ENOMEM; |
1544 | |
1545 | len = input_print_modalias(&env->buf[env->buflen - 1], |
1546 | sizeof(env->buf) - env->buflen, |
1547 | dev, 0); |
1548 | if (len >= (sizeof(env->buf) - env->buflen)) |
1549 | return -ENOMEM; |
1550 | |
1551 | env->buflen += len; |
1552 | return 0; |
1553 | } |
1554 | |
1555 | #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ |
1556 | do { \ |
1557 | int err = add_uevent_var(env, fmt, val); \ |
1558 | if (err) \ |
1559 | return err; \ |
1560 | } while (0) |
1561 | |
1562 | #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ |
1563 | do { \ |
1564 | int err = input_add_uevent_bm_var(env, name, bm, max); \ |
1565 | if (err) \ |
1566 | return err; \ |
1567 | } while (0) |
1568 | |
1569 | #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ |
1570 | do { \ |
1571 | int err = input_add_uevent_modalias_var(env, dev); \ |
1572 | if (err) \ |
1573 | return err; \ |
1574 | } while (0) |
1575 | |
1576 | static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) |
1577 | { |
1578 | struct input_dev *dev = to_input_dev(device); |
1579 | |
1580 | INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", |
1581 | dev->id.bustype, dev->id.vendor, |
1582 | dev->id.product, dev->id.version); |
1583 | if (dev->name) |
1584 | INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); |
1585 | if (dev->phys) |
1586 | INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); |
1587 | if (dev->uniq) |
1588 | INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); |
1589 | |
1590 | INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); |
1591 | |
1592 | INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); |
1593 | if (test_bit(EV_KEY, dev->evbit)) |
1594 | INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); |
1595 | if (test_bit(EV_REL, dev->evbit)) |
1596 | INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); |
1597 | if (test_bit(EV_ABS, dev->evbit)) |
1598 | INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); |
1599 | if (test_bit(EV_MSC, dev->evbit)) |
1600 | INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); |
1601 | if (test_bit(EV_LED, dev->evbit)) |
1602 | INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); |
1603 | if (test_bit(EV_SND, dev->evbit)) |
1604 | INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); |
1605 | if (test_bit(EV_FF, dev->evbit)) |
1606 | INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); |
1607 | if (test_bit(EV_SW, dev->evbit)) |
1608 | INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); |
1609 | |
1610 | INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); |
1611 | |
1612 | return 0; |
1613 | } |
1614 | |
1615 | #define INPUT_DO_TOGGLE(dev, type, bits, on) \ |
1616 | do { \ |
1617 | int i; \ |
1618 | bool active; \ |
1619 | \ |
1620 | if (!test_bit(EV_##type, dev->evbit)) \ |
1621 | break; \ |
1622 | \ |
1623 | for (i = 0; i < type##_MAX; i++) { \ |
1624 | if (!test_bit(i, dev->bits##bit)) \ |
1625 | continue; \ |
1626 | \ |
1627 | active = test_bit(i, dev->bits); \ |
1628 | if (!active && !on) \ |
1629 | continue; \ |
1630 | \ |
1631 | dev->event(dev, EV_##type, i, on ? active : 0); \ |
1632 | } \ |
1633 | } while (0) |
1634 | |
1635 | static void input_dev_toggle(struct input_dev *dev, bool activate) |
1636 | { |
1637 | if (!dev->event) |
1638 | return; |
1639 | |
1640 | INPUT_DO_TOGGLE(dev, LED, led, activate); |
1641 | INPUT_DO_TOGGLE(dev, SND, snd, activate); |
1642 | |
1643 | if (activate && test_bit(EV_REP, dev->evbit)) { |
1644 | dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]); |
1645 | dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]); |
1646 | } |
1647 | } |
1648 | |
1649 | /** |
1650 | * input_reset_device() - reset/restore the state of input device |
1651 | * @dev: input device whose state needs to be reset |
1652 | * |
1653 | * This function tries to reset the state of an opened input device and |
1654 | * bring internal state and state if the hardware in sync with each other. |
1655 | * We mark all keys as released, restore LED state, repeat rate, etc. |
1656 | */ |
1657 | void input_reset_device(struct input_dev *dev) |
1658 | { |
1659 | unsigned long flags; |
1660 | |
1661 | mutex_lock(&dev->mutex); |
1662 | spin_lock_irqsave(&dev->event_lock, flags); |
1663 | |
1664 | input_dev_toggle(dev, true); |
1665 | input_dev_release_keys(dev); |
1666 | |
1667 | spin_unlock_irqrestore(&dev->event_lock, flags); |
1668 | mutex_unlock(&dev->mutex); |
1669 | } |
1670 | EXPORT_SYMBOL(input_reset_device); |
1671 | |
1672 | #ifdef CONFIG_PM_SLEEP |
1673 | static int input_dev_suspend(struct device *dev) |
1674 | { |
1675 | struct input_dev *input_dev = to_input_dev(dev); |
1676 | |
1677 | spin_lock_irq(&input_dev->event_lock); |
1678 | |
1679 | /* |
1680 | * Keys that are pressed now are unlikely to be |
1681 | * still pressed when we resume. |
1682 | */ |
1683 | input_dev_release_keys(input_dev); |
1684 | |
1685 | /* Turn off LEDs and sounds, if any are active. */ |
1686 | input_dev_toggle(input_dev, false); |
1687 | |
1688 | spin_unlock_irq(&input_dev->event_lock); |
1689 | |
1690 | return 0; |
1691 | } |
1692 | |
1693 | static int input_dev_resume(struct device *dev) |
1694 | { |
1695 | struct input_dev *input_dev = to_input_dev(dev); |
1696 | |
1697 | spin_lock_irq(&input_dev->event_lock); |
1698 | |
1699 | /* Restore state of LEDs and sounds, if any were active. */ |
1700 | input_dev_toggle(input_dev, true); |
1701 | |
1702 | spin_unlock_irq(&input_dev->event_lock); |
1703 | |
1704 | return 0; |
1705 | } |
1706 | |
1707 | static int input_dev_freeze(struct device *dev) |
1708 | { |
1709 | struct input_dev *input_dev = to_input_dev(dev); |
1710 | |
1711 | spin_lock_irq(&input_dev->event_lock); |
1712 | |
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); |
1718 | |
1719 | spin_unlock_irq(&input_dev->event_lock); |
1720 | |
1721 | return 0; |
1722 | } |
1723 | |
1724 | static int input_dev_poweroff(struct device *dev) |
1725 | { |
1726 | struct input_dev *input_dev = to_input_dev(dev); |
1727 | |
1728 | spin_lock_irq(&input_dev->event_lock); |
1729 | |
1730 | /* Turn off LEDs and sounds, if any are active. */ |
1731 | input_dev_toggle(input_dev, false); |
1732 | |
1733 | spin_unlock_irq(&input_dev->event_lock); |
1734 | |
1735 | return 0; |
1736 | } |
1737 | |
1738 | static const struct dev_pm_ops input_dev_pm_ops = { |
1739 | .suspend = input_dev_suspend, |
1740 | .resume = input_dev_resume, |
1741 | .freeze = input_dev_freeze, |
1742 | .poweroff = input_dev_poweroff, |
1743 | .restore = input_dev_resume, |
1744 | }; |
1745 | #endif /* CONFIG_PM */ |
1746 | |
1747 | static struct device_type input_dev_type = { |
1748 | .groups = input_dev_attr_groups, |
1749 | .release = input_dev_release, |
1750 | .uevent = input_dev_uevent, |
1751 | #ifdef CONFIG_PM_SLEEP |
1752 | .pm = &input_dev_pm_ops, |
1753 | #endif |
1754 | }; |
1755 | |
1756 | static char *input_devnode(struct device *dev, umode_t *mode) |
1757 | { |
1758 | return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); |
1759 | } |
1760 | |
1761 | struct class input_class = { |
1762 | .name = "input", |
1763 | .devnode = input_devnode, |
1764 | }; |
1765 | EXPORT_SYMBOL_GPL(input_class); |
1766 | |
1767 | /** |
1768 | * input_allocate_device - allocate memory for new input device |
1769 | * |
1770 | * Returns prepared struct input_dev or %NULL. |
1771 | * |
1772 | * NOTE: Use input_free_device() to free devices that have not been |
1773 | * registered; input_unregister_device() should be used for already |
1774 | * registered devices. |
1775 | */ |
1776 | struct input_dev *input_allocate_device(void) |
1777 | { |
1778 | static atomic_t input_no = ATOMIC_INIT(0); |
1779 | struct input_dev *dev; |
1780 | |
1781 | dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); |
1782 | if (dev) { |
1783 | dev->dev.type = &input_dev_type; |
1784 | dev->dev.class = &input_class; |
1785 | device_initialize(&dev->dev); |
1786 | mutex_init(&dev->mutex); |
1787 | spin_lock_init(&dev->event_lock); |
1788 | init_timer(&dev->timer); |
1789 | INIT_LIST_HEAD(&dev->h_list); |
1790 | INIT_LIST_HEAD(&dev->node); |
1791 | |
1792 | dev_set_name(&dev->dev, "input%lu", |
1793 | (unsigned long) atomic_inc_return(&input_no) - 1); |
1794 | |
1795 | __module_get(THIS_MODULE); |
1796 | } |
1797 | |
1798 | return dev; |
1799 | } |
1800 | EXPORT_SYMBOL(input_allocate_device); |
1801 | |
1802 | struct input_devres { |
1803 | struct input_dev *input; |
1804 | }; |
1805 | |
1806 | static int devm_input_device_match(struct device *dev, void *res, void *data) |
1807 | { |
1808 | struct input_devres *devres = res; |
1809 | |
1810 | return devres->input == data; |
1811 | } |
1812 | |
1813 | static void devm_input_device_release(struct device *dev, void *res) |
1814 | { |
1815 | struct input_devres *devres = res; |
1816 | struct input_dev *input = devres->input; |
1817 | |
1818 | dev_dbg(dev, "%s: dropping reference to %s\n", |
1819 | __func__, dev_name(&input->dev)); |
1820 | input_put_device(input); |
1821 | } |
1822 | |
1823 | /** |
1824 | * devm_input_allocate_device - allocate managed input device |
1825 | * @dev: device owning the input device being created |
1826 | * |
1827 | * Returns prepared struct input_dev or %NULL. |
1828 | * |
1829 | * Managed input devices do not need to be explicitly unregistered or |
1830 | * freed as it will be done automatically when owner device unbinds from |
1831 | * its driver (or binding fails). Once managed input device is allocated, |
1832 | * it is ready to be set up and registered in the same fashion as regular |
1833 | * input device. There are no special devm_input_device_[un]register() |
1834 | * variants, regular ones work with both managed and unmanaged devices, |
1835 | * should you need them. In most cases however, managed input device need |
1836 | * not be explicitly unregistered or freed. |
1837 | * |
1838 | * NOTE: the owner device is set up as parent of input device and users |
1839 | * should not override it. |
1840 | */ |
1841 | struct input_dev *devm_input_allocate_device(struct device *dev) |
1842 | { |
1843 | struct input_dev *input; |
1844 | struct input_devres *devres; |
1845 | |
1846 | devres = devres_alloc(devm_input_device_release, |
1847 | sizeof(struct input_devres), GFP_KERNEL); |
1848 | if (!devres) |
1849 | return NULL; |
1850 | |
1851 | input = input_allocate_device(); |
1852 | if (!input) { |
1853 | devres_free(devres); |
1854 | return NULL; |
1855 | } |
1856 | |
1857 | input->dev.parent = dev; |
1858 | input->devres_managed = true; |
1859 | |
1860 | devres->input = input; |
1861 | devres_add(dev, devres); |
1862 | |
1863 | return input; |
1864 | } |
1865 | EXPORT_SYMBOL(devm_input_allocate_device); |
1866 | |
1867 | /** |
1868 | * input_free_device - free memory occupied by input_dev structure |
1869 | * @dev: input device to free |
1870 | * |
1871 | * This function should only be used if input_register_device() |
1872 | * was not called yet or if it failed. Once device was registered |
1873 | * use input_unregister_device() and memory will be freed once last |
1874 | * reference to the device is dropped. |
1875 | * |
1876 | * Device should be allocated by input_allocate_device(). |
1877 | * |
1878 | * NOTE: If there are references to the input device then memory |
1879 | * will not be freed until last reference is dropped. |
1880 | */ |
1881 | void input_free_device(struct input_dev *dev) |
1882 | { |
1883 | if (dev) { |
1884 | if (dev->devres_managed) |
1885 | WARN_ON(devres_destroy(dev->dev.parent, |
1886 | devm_input_device_release, |
1887 | devm_input_device_match, |
1888 | dev)); |
1889 | input_put_device(dev); |
1890 | } |
1891 | } |
1892 | EXPORT_SYMBOL(input_free_device); |
1893 | |
1894 | /** |
1895 | * input_set_capability - mark device as capable of a certain event |
1896 | * @dev: device that is capable of emitting or accepting event |
1897 | * @type: type of the event (EV_KEY, EV_REL, etc...) |
1898 | * @code: event code |
1899 | * |
1900 | * In addition to setting up corresponding bit in appropriate capability |
1901 | * bitmap the function also adjusts dev->evbit. |
1902 | */ |
1903 | void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) |
1904 | { |
1905 | switch (type) { |
1906 | case EV_KEY: |
1907 | __set_bit(code, dev->keybit); |
1908 | break; |
1909 | |
1910 | case EV_REL: |
1911 | __set_bit(code, dev->relbit); |
1912 | break; |
1913 | |
1914 | case EV_ABS: |
1915 | input_alloc_absinfo(dev); |
1916 | if (!dev->absinfo) |
1917 | return; |
1918 | |
1919 | __set_bit(code, dev->absbit); |
1920 | break; |
1921 | |
1922 | case EV_MSC: |
1923 | __set_bit(code, dev->mscbit); |
1924 | break; |
1925 | |
1926 | case EV_SW: |
1927 | __set_bit(code, dev->swbit); |
1928 | break; |
1929 | |
1930 | case EV_LED: |
1931 | __set_bit(code, dev->ledbit); |
1932 | break; |
1933 | |
1934 | case EV_SND: |
1935 | __set_bit(code, dev->sndbit); |
1936 | break; |
1937 | |
1938 | case EV_FF: |
1939 | __set_bit(code, dev->ffbit); |
1940 | break; |
1941 | |
1942 | case EV_PWR: |
1943 | /* do nothing */ |
1944 | break; |
1945 | |
1946 | default: |
1947 | pr_err("input_set_capability: unknown type %u (code %u)\n", |
1948 | type, code); |
1949 | dump_stack(); |
1950 | return; |
1951 | } |
1952 | |
1953 | __set_bit(type, dev->evbit); |
1954 | } |
1955 | EXPORT_SYMBOL(input_set_capability); |
1956 | |
1957 | static unsigned int input_estimate_events_per_packet(struct input_dev *dev) |
1958 | { |
1959 | int mt_slots; |
1960 | int i; |
1961 | unsigned int events; |
1962 | |
1963 | if (dev->mt) { |
1964 | mt_slots = dev->mt->num_slots; |
1965 | } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { |
1966 | mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - |
1967 | dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, |
1968 | mt_slots = clamp(mt_slots, 2, 32); |
1969 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { |
1970 | mt_slots = 2; |
1971 | } else { |
1972 | mt_slots = 0; |
1973 | } |
1974 | |
1975 | events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ |
1976 | |
1977 | for (i = 0; i < ABS_CNT; i++) { |
1978 | if (test_bit(i, dev->absbit)) { |
1979 | if (input_is_mt_axis(i)) |
1980 | events += mt_slots; |
1981 | else |
1982 | events++; |
1983 | } |
1984 | } |
1985 | |
1986 | for (i = 0; i < REL_CNT; i++) |
1987 | if (test_bit(i, dev->relbit)) |
1988 | events++; |
1989 | |
1990 | /* Make room for KEY and MSC events */ |
1991 | events += 7; |
1992 | |
1993 | return events; |
1994 | } |
1995 | |
1996 | #define INPUT_CLEANSE_BITMASK(dev, type, bits) \ |
1997 | do { \ |
1998 | if (!test_bit(EV_##type, dev->evbit)) \ |
1999 | memset(dev->bits##bit, 0, \ |
2000 | sizeof(dev->bits##bit)); \ |
2001 | } while (0) |
2002 | |
2003 | static void input_cleanse_bitmasks(struct input_dev *dev) |
2004 | { |
2005 | INPUT_CLEANSE_BITMASK(dev, KEY, key); |
2006 | INPUT_CLEANSE_BITMASK(dev, REL, rel); |
2007 | INPUT_CLEANSE_BITMASK(dev, ABS, abs); |
2008 | INPUT_CLEANSE_BITMASK(dev, MSC, msc); |
2009 | INPUT_CLEANSE_BITMASK(dev, LED, led); |
2010 | INPUT_CLEANSE_BITMASK(dev, SND, snd); |
2011 | INPUT_CLEANSE_BITMASK(dev, FF, ff); |
2012 | INPUT_CLEANSE_BITMASK(dev, SW, sw); |
2013 | } |
2014 | |
2015 | static void __input_unregister_device(struct input_dev *dev) |
2016 | { |
2017 | struct input_handle *handle, *next; |
2018 | |
2019 | input_disconnect_device(dev); |
2020 | |
2021 | mutex_lock(&input_mutex); |
2022 | |
2023 | list_for_each_entry_safe(handle, next, &dev->h_list, d_node) |
2024 | handle->handler->disconnect(handle); |
2025 | WARN_ON(!list_empty(&dev->h_list)); |
2026 | |
2027 | del_timer_sync(&dev->timer); |
2028 | list_del_init(&dev->node); |
2029 | |
2030 | input_wakeup_procfs_readers(); |
2031 | |
2032 | mutex_unlock(&input_mutex); |
2033 | |
2034 | device_del(&dev->dev); |
2035 | } |
2036 | |
2037 | static void devm_input_device_unregister(struct device *dev, void *res) |
2038 | { |
2039 | struct input_devres *devres = res; |
2040 | struct input_dev *input = devres->input; |
2041 | |
2042 | dev_dbg(dev, "%s: unregistering device %s\n", |
2043 | __func__, dev_name(&input->dev)); |
2044 | __input_unregister_device(input); |
2045 | } |
2046 | |
2047 | /** |
2048 | * input_register_device - register device with input core |
2049 | * @dev: device to be registered |
2050 | * |
2051 | * This function registers device with input core. The device must be |
2052 | * allocated with input_allocate_device() and all it's capabilities |
2053 | * set up before registering. |
2054 | * If function fails the device must be freed with input_free_device(). |
2055 | * Once device has been successfully registered it can be unregistered |
2056 | * with input_unregister_device(); input_free_device() should not be |
2057 | * called in this case. |
2058 | * |
2059 | * Note that this function is also used to register managed input devices |
2060 | * (ones allocated with devm_input_allocate_device()). Such managed input |
2061 | * devices need not be explicitly unregistered or freed, their tear down |
2062 | * is controlled by the devres infrastructure. It is also worth noting |
2063 | * that tear down of managed input devices is internally a 2-step process: |
2064 | * registered managed input device is first unregistered, but stays in |
2065 | * memory and can still handle input_event() calls (although events will |
2066 | * not be delivered anywhere). The freeing of managed input device will |
2067 | * happen later, when devres stack is unwound to the point where device |
2068 | * allocation was made. |
2069 | */ |
2070 | int input_register_device(struct input_dev *dev) |
2071 | { |
2072 | struct input_devres *devres = NULL; |
2073 | struct input_handler *handler; |
2074 | unsigned int packet_size; |
2075 | const char *path; |
2076 | int error; |
2077 | |
2078 | if (dev->devres_managed) { |
2079 | devres = devres_alloc(devm_input_device_unregister, |
2080 | sizeof(struct input_devres), GFP_KERNEL); |
2081 | if (!devres) |
2082 | return -ENOMEM; |
2083 | |
2084 | devres->input = dev; |
2085 | } |
2086 | |
2087 | /* Every input device generates EV_SYN/SYN_REPORT events. */ |
2088 | __set_bit(EV_SYN, dev->evbit); |
2089 | |
2090 | /* KEY_RESERVED is not supposed to be transmitted to userspace. */ |
2091 | __clear_bit(KEY_RESERVED, dev->keybit); |
2092 | |
2093 | /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ |
2094 | input_cleanse_bitmasks(dev); |
2095 | |
2096 | packet_size = input_estimate_events_per_packet(dev); |
2097 | if (dev->hint_events_per_packet < packet_size) |
2098 | dev->hint_events_per_packet = packet_size; |
2099 | |
2100 | dev->max_vals = dev->hint_events_per_packet + 2; |
2101 | dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); |
2102 | if (!dev->vals) { |
2103 | error = -ENOMEM; |
2104 | goto err_devres_free; |
2105 | } |
2106 | |
2107 | /* |
2108 | * If delay and period are pre-set by the driver, then autorepeating |
2109 | * is handled by the driver itself and we don't do it in input.c. |
2110 | */ |
2111 | if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { |
2112 | dev->timer.data = (long) dev; |
2113 | dev->timer.function = input_repeat_key; |
2114 | dev->rep[REP_DELAY] = 250; |
2115 | dev->rep[REP_PERIOD] = 33; |
2116 | } |
2117 | |
2118 | if (!dev->getkeycode) |
2119 | dev->getkeycode = input_default_getkeycode; |
2120 | |
2121 | if (!dev->setkeycode) |
2122 | dev->setkeycode = input_default_setkeycode; |
2123 | |
2124 | error = device_add(&dev->dev); |
2125 | if (error) |
2126 | goto err_free_vals; |
2127 | |
2128 | path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); |
2129 | pr_info("%s as %s\n", |
2130 | dev->name ? dev->name : "Unspecified device", |
2131 | path ? path : "N/A"); |
2132 | kfree(path); |
2133 | |
2134 | error = mutex_lock_interruptible(&input_mutex); |
2135 | if (error) |
2136 | goto err_device_del; |
2137 | |
2138 | list_add_tail(&dev->node, &input_dev_list); |
2139 | |
2140 | list_for_each_entry(handler, &input_handler_list, node) |
2141 | input_attach_handler(dev, handler); |
2142 | |
2143 | input_wakeup_procfs_readers(); |
2144 | |
2145 | mutex_unlock(&input_mutex); |
2146 | |
2147 | if (dev->devres_managed) { |
2148 | dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n", |
2149 | __func__, dev_name(&dev->dev)); |
2150 | devres_add(dev->dev.parent, devres); |
2151 | } |
2152 | return 0; |
2153 | |
2154 | err_device_del: |
2155 | device_del(&dev->dev); |
2156 | err_free_vals: |
2157 | kfree(dev->vals); |
2158 | dev->vals = NULL; |
2159 | err_devres_free: |
2160 | devres_free(devres); |
2161 | return error; |
2162 | } |
2163 | EXPORT_SYMBOL(input_register_device); |
2164 | |
2165 | /** |
2166 | * input_unregister_device - unregister previously registered device |
2167 | * @dev: device to be unregistered |
2168 | * |
2169 | * This function unregisters an input device. Once device is unregistered |
2170 | * the caller should not try to access it as it may get freed at any moment. |
2171 | */ |
2172 | void input_unregister_device(struct input_dev *dev) |
2173 | { |
2174 | if (dev->devres_managed) { |
2175 | WARN_ON(devres_destroy(dev->dev.parent, |
2176 | devm_input_device_unregister, |
2177 | devm_input_device_match, |
2178 | dev)); |
2179 | __input_unregister_device(dev); |
2180 | /* |
2181 | * We do not do input_put_device() here because it will be done |
2182 | * when 2nd devres fires up. |
2183 | */ |
2184 | } else { |
2185 | __input_unregister_device(dev); |
2186 | input_put_device(dev); |
2187 | } |
2188 | } |
2189 | EXPORT_SYMBOL(input_unregister_device); |
2190 | |
2191 | /** |
2192 | * input_register_handler - register a new input handler |
2193 | * @handler: handler to be registered |
2194 | * |
2195 | * This function registers a new input handler (interface) for input |
2196 | * devices in the system and attaches it to all input devices that |
2197 | * are compatible with the handler. |
2198 | */ |
2199 | int input_register_handler(struct input_handler *handler) |
2200 | { |
2201 | struct input_dev *dev; |
2202 | int error; |
2203 | |
2204 | error = mutex_lock_interruptible(&input_mutex); |
2205 | if (error) |
2206 | return error; |
2207 | |
2208 | INIT_LIST_HEAD(&handler->h_list); |
2209 | |
2210 | list_add_tail(&handler->node, &input_handler_list); |
2211 | |
2212 | list_for_each_entry(dev, &input_dev_list, node) |
2213 | input_attach_handler(dev, handler); |
2214 | |
2215 | input_wakeup_procfs_readers(); |
2216 | |
2217 | mutex_unlock(&input_mutex); |
2218 | return 0; |
2219 | } |
2220 | EXPORT_SYMBOL(input_register_handler); |
2221 | |
2222 | /** |
2223 | * input_unregister_handler - unregisters an input handler |
2224 | * @handler: handler to be unregistered |
2225 | * |
2226 | * This function disconnects a handler from its input devices and |
2227 | * removes it from lists of known handlers. |
2228 | */ |
2229 | void input_unregister_handler(struct input_handler *handler) |
2230 | { |
2231 | struct input_handle *handle, *next; |
2232 | |
2233 | mutex_lock(&input_mutex); |
2234 | |
2235 | list_for_each_entry_safe(handle, next, &handler->h_list, h_node) |
2236 | handler->disconnect(handle); |
2237 | WARN_ON(!list_empty(&handler->h_list)); |
2238 | |
2239 | list_del_init(&handler->node); |
2240 | |
2241 | input_wakeup_procfs_readers(); |
2242 | |
2243 | mutex_unlock(&input_mutex); |
2244 | } |
2245 | EXPORT_SYMBOL(input_unregister_handler); |
2246 | |
2247 | /** |
2248 | * input_handler_for_each_handle - handle iterator |
2249 | * @handler: input handler to iterate |
2250 | * @data: data for the callback |
2251 | * @fn: function to be called for each handle |
2252 | * |
2253 | * Iterate over @bus's list of devices, and call @fn for each, passing |
2254 | * it @data and stop when @fn returns a non-zero value. The function is |
2255 | * using RCU to traverse the list and therefore may be usind in atonic |
2256 | * contexts. The @fn callback is invoked from RCU critical section and |
2257 | * thus must not sleep. |
2258 | */ |
2259 | int input_handler_for_each_handle(struct input_handler *handler, void *data, |
2260 | int (*fn)(struct input_handle *, void *)) |
2261 | { |
2262 | struct input_handle *handle; |
2263 | int retval = 0; |
2264 | |
2265 | rcu_read_lock(); |
2266 | |
2267 | list_for_each_entry_rcu(handle, &handler->h_list, h_node) { |
2268 | retval = fn(handle, data); |
2269 | if (retval) |
2270 | break; |
2271 | } |
2272 | |
2273 | rcu_read_unlock(); |
2274 | |
2275 | return retval; |
2276 | } |
2277 | EXPORT_SYMBOL(input_handler_for_each_handle); |
2278 | |
2279 | /** |
2280 | * input_register_handle - register a new input handle |
2281 | * @handle: handle to register |
2282 | * |
2283 | * This function puts a new input handle onto device's |
2284 | * and handler's lists so that events can flow through |
2285 | * it once it is opened using input_open_device(). |
2286 | * |
2287 | * This function is supposed to be called from handler's |
2288 | * connect() method. |
2289 | */ |
2290 | int input_register_handle(struct input_handle *handle) |
2291 | { |
2292 | struct input_handler *handler = handle->handler; |
2293 | struct input_dev *dev = handle->dev; |
2294 | int error; |
2295 | |
2296 | /* |
2297 | * We take dev->mutex here to prevent race with |
2298 | * input_release_device(). |
2299 | */ |
2300 | error = mutex_lock_interruptible(&dev->mutex); |
2301 | if (error) |
2302 | return error; |
2303 | |
2304 | /* |
2305 | * Filters go to the head of the list, normal handlers |
2306 | * to the tail. |
2307 | */ |
2308 | if (handler->filter) |
2309 | list_add_rcu(&handle->d_node, &dev->h_list); |
2310 | else |
2311 | list_add_tail_rcu(&handle->d_node, &dev->h_list); |
2312 | |
2313 | mutex_unlock(&dev->mutex); |
2314 | |
2315 | /* |
2316 | * Since we are supposed to be called from ->connect() |
2317 | * which is mutually exclusive with ->disconnect() |
2318 | * we can't be racing with input_unregister_handle() |
2319 | * and so separate lock is not needed here. |
2320 | */ |
2321 | list_add_tail_rcu(&handle->h_node, &handler->h_list); |
2322 | |
2323 | if (handler->start) |
2324 | handler->start(handle); |
2325 | |
2326 | return 0; |
2327 | } |
2328 | EXPORT_SYMBOL(input_register_handle); |
2329 | |
2330 | /** |
2331 | * input_unregister_handle - unregister an input handle |
2332 | * @handle: handle to unregister |
2333 | * |
2334 | * This function removes input handle from device's |
2335 | * and handler's lists. |
2336 | * |
2337 | * This function is supposed to be called from handler's |
2338 | * disconnect() method. |
2339 | */ |
2340 | void input_unregister_handle(struct input_handle *handle) |
2341 | { |
2342 | struct input_dev *dev = handle->dev; |
2343 | |
2344 | list_del_rcu(&handle->h_node); |
2345 | |
2346 | /* |
2347 | * Take dev->mutex to prevent race with input_release_device(). |
2348 | */ |
2349 | mutex_lock(&dev->mutex); |
2350 | list_del_rcu(&handle->d_node); |
2351 | mutex_unlock(&dev->mutex); |
2352 | |
2353 | synchronize_rcu(); |
2354 | } |
2355 | EXPORT_SYMBOL(input_unregister_handle); |
2356 | |
2357 | /** |
2358 | * input_get_new_minor - allocates a new input minor number |
2359 | * @legacy_base: beginning or the legacy range to be searched |
2360 | * @legacy_num: size of legacy range |
2361 | * @allow_dynamic: whether we can also take ID from the dynamic range |
2362 | * |
2363 | * This function allocates a new device minor for from input major namespace. |
2364 | * Caller can request legacy minor by specifying @legacy_base and @legacy_num |
2365 | * parameters and whether ID can be allocated from dynamic range if there are |
2366 | * no free IDs in legacy range. |
2367 | */ |
2368 | int input_get_new_minor(int legacy_base, unsigned int legacy_num, |
2369 | bool allow_dynamic) |
2370 | { |
2371 | /* |
2372 | * This function should be called from input handler's ->connect() |
2373 | * methods, which are serialized with input_mutex, so no additional |
2374 | * locking is needed here. |
2375 | */ |
2376 | if (legacy_base >= 0) { |
2377 | int minor = ida_simple_get(&input_ida, |
2378 | legacy_base, |
2379 | legacy_base + legacy_num, |
2380 | GFP_KERNEL); |
2381 | if (minor >= 0 || !allow_dynamic) |
2382 | return minor; |
2383 | } |
2384 | |
2385 | return ida_simple_get(&input_ida, |
2386 | INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES, |
2387 | GFP_KERNEL); |
2388 | } |
2389 | EXPORT_SYMBOL(input_get_new_minor); |
2390 | |
2391 | /** |
2392 | * input_free_minor - release previously allocated minor |
2393 | * @minor: minor to be released |
2394 | * |
2395 | * This function releases previously allocated input minor so that it can be |
2396 | * reused later. |
2397 | */ |
2398 | void input_free_minor(unsigned int minor) |
2399 | { |
2400 | ida_simple_remove(&input_ida, minor); |
2401 | } |
2402 | EXPORT_SYMBOL(input_free_minor); |
2403 | |
2404 | static int __init input_init(void) |
2405 | { |
2406 | int err; |
2407 | |
2408 | err = class_register(&input_class); |
2409 | if (err) { |
2410 | pr_err("unable to register input_dev class\n"); |
2411 | return err; |
2412 | } |
2413 | |
2414 | err = input_proc_init(); |
2415 | if (err) |
2416 | goto fail1; |
2417 | |
2418 | err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2419 | INPUT_MAX_CHAR_DEVICES, "input"); |
2420 | if (err) { |
2421 | pr_err("unable to register char major %d", INPUT_MAJOR); |
2422 | goto fail2; |
2423 | } |
2424 | |
2425 | return 0; |
2426 | |
2427 | fail2: input_proc_exit(); |
2428 | fail1: class_unregister(&input_class); |
2429 | return err; |
2430 | } |
2431 | |
2432 | static void __exit input_exit(void) |
2433 | { |
2434 | input_proc_exit(); |
2435 | unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), |
2436 | INPUT_MAX_CHAR_DEVICES); |
2437 | class_unregister(&input_class); |
2438 | } |
2439 | |
2440 | subsys_initcall(input_init); |
2441 | module_exit(input_exit); |
2442 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9