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