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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * The input core
4 *
5 * Copyright (c) 1999-2002 Vojtech Pavlik
6 */
7
8
9#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
10
11#include <linux/init.h>
12#include <linux/types.h>
13#include <linux/idr.h>
14#include <linux/input/mt.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/random.h>
18#include <linux/major.h>
19#include <linux/proc_fs.h>
20#include <linux/sched.h>
21#include <linux/seq_file.h>
22#include <linux/poll.h>
23#include <linux/device.h>
24#include <linux/kstrtox.h>
25#include <linux/mutex.h>
26#include <linux/rcupdate.h>
27#include "input-compat.h"
28#include "input-core-private.h"
29#include "input-poller.h"
30
31MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
32MODULE_DESCRIPTION("Input core");
33MODULE_LICENSE("GPL");
34
35#define INPUT_MAX_CHAR_DEVICES 1024
36#define INPUT_FIRST_DYNAMIC_DEV 256
37static DEFINE_IDA(input_ida);
38
39static LIST_HEAD(input_dev_list);
40static LIST_HEAD(input_handler_list);
41
42/*
43 * input_mutex protects access to both input_dev_list and input_handler_list.
44 * This also causes input_[un]register_device and input_[un]register_handler
45 * be mutually exclusive which simplifies locking in drivers implementing
46 * input handlers.
47 */
48static DEFINE_MUTEX(input_mutex);
49
50static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
51
52static const unsigned int input_max_code[EV_CNT] = {
53 [EV_KEY] = KEY_MAX,
54 [EV_REL] = REL_MAX,
55 [EV_ABS] = ABS_MAX,
56 [EV_MSC] = MSC_MAX,
57 [EV_SW] = SW_MAX,
58 [EV_LED] = LED_MAX,
59 [EV_SND] = SND_MAX,
60 [EV_FF] = FF_MAX,
61};
62
63static inline int is_event_supported(unsigned int code,
64 unsigned long *bm, unsigned int max)
65{
66 return code <= max && test_bit(code, bm);
67}
68
69static int input_defuzz_abs_event(int value, int old_val, int fuzz)
70{
71 if (fuzz) {
72 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
73 return old_val;
74
75 if (value > old_val - fuzz && value < old_val + fuzz)
76 return (old_val * 3 + value) / 4;
77
78 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
79 return (old_val + value) / 2;
80 }
81
82 return value;
83}
84
85static void input_start_autorepeat(struct input_dev *dev, int code)
86{
87 if (test_bit(EV_REP, dev->evbit) &&
88 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
89 dev->timer.function) {
90 dev->repeat_key = code;
91 mod_timer(&dev->timer,
92 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
93 }
94}
95
96static void input_stop_autorepeat(struct input_dev *dev)
97{
98 del_timer(&dev->timer);
99}
100
101/*
102 * Pass event first through all filters and then, if event has not been
103 * filtered out, through all open handles. This function is called with
104 * dev->event_lock held and interrupts disabled.
105 */
106static unsigned int input_to_handler(struct input_handle *handle,
107 struct input_value *vals, unsigned int count)
108{
109 struct input_handler *handler = handle->handler;
110 struct input_value *end = vals;
111 struct input_value *v;
112
113 if (handler->filter) {
114 for (v = vals; v != vals + count; v++) {
115 if (handler->filter(handle, v->type, v->code, v->value))
116 continue;
117 if (end != v)
118 *end = *v;
119 end++;
120 }
121 count = end - vals;
122 }
123
124 if (!count)
125 return 0;
126
127 if (handler->events)
128 handler->events(handle, vals, count);
129 else if (handler->event)
130 for (v = vals; v != vals + count; v++)
131 handler->event(handle, v->type, v->code, v->value);
132
133 return count;
134}
135
136/*
137 * Pass values first through all filters and then, if event has not been
138 * filtered out, through all open handles. This function is called with
139 * dev->event_lock held and interrupts disabled.
140 */
141static void input_pass_values(struct input_dev *dev,
142 struct input_value *vals, unsigned int count)
143{
144 struct input_handle *handle;
145 struct input_value *v;
146
147 lockdep_assert_held(&dev->event_lock);
148
149 if (!count)
150 return;
151
152 rcu_read_lock();
153
154 handle = rcu_dereference(dev->grab);
155 if (handle) {
156 count = input_to_handler(handle, vals, count);
157 } else {
158 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
159 if (handle->open) {
160 count = input_to_handler(handle, vals, count);
161 if (!count)
162 break;
163 }
164 }
165
166 rcu_read_unlock();
167
168 /* trigger auto repeat for key events */
169 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
170 for (v = vals; v != vals + count; v++) {
171 if (v->type == EV_KEY && v->value != 2) {
172 if (v->value)
173 input_start_autorepeat(dev, v->code);
174 else
175 input_stop_autorepeat(dev);
176 }
177 }
178 }
179}
180
181#define INPUT_IGNORE_EVENT 0
182#define INPUT_PASS_TO_HANDLERS 1
183#define INPUT_PASS_TO_DEVICE 2
184#define INPUT_SLOT 4
185#define INPUT_FLUSH 8
186#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
187
188static int input_handle_abs_event(struct input_dev *dev,
189 unsigned int code, int *pval)
190{
191 struct input_mt *mt = dev->mt;
192 bool is_mt_event;
193 int *pold;
194
195 if (code == ABS_MT_SLOT) {
196 /*
197 * "Stage" the event; we'll flush it later, when we
198 * get actual touch data.
199 */
200 if (mt && *pval >= 0 && *pval < mt->num_slots)
201 mt->slot = *pval;
202
203 return INPUT_IGNORE_EVENT;
204 }
205
206 is_mt_event = input_is_mt_value(code);
207
208 if (!is_mt_event) {
209 pold = &dev->absinfo[code].value;
210 } else if (mt) {
211 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
212 } else {
213 /*
214 * Bypass filtering for multi-touch events when
215 * not employing slots.
216 */
217 pold = NULL;
218 }
219
220 if (pold) {
221 *pval = input_defuzz_abs_event(*pval, *pold,
222 dev->absinfo[code].fuzz);
223 if (*pold == *pval)
224 return INPUT_IGNORE_EVENT;
225
226 *pold = *pval;
227 }
228
229 /* Flush pending "slot" event */
230 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
231 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
232 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
233 }
234
235 return INPUT_PASS_TO_HANDLERS;
236}
237
238static int input_get_disposition(struct input_dev *dev,
239 unsigned int type, unsigned int code, int *pval)
240{
241 int disposition = INPUT_IGNORE_EVENT;
242 int value = *pval;
243
244 /* filter-out events from inhibited devices */
245 if (dev->inhibited)
246 return INPUT_IGNORE_EVENT;
247
248 switch (type) {
249
250 case EV_SYN:
251 switch (code) {
252 case SYN_CONFIG:
253 disposition = INPUT_PASS_TO_ALL;
254 break;
255
256 case SYN_REPORT:
257 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
258 break;
259 case SYN_MT_REPORT:
260 disposition = INPUT_PASS_TO_HANDLERS;
261 break;
262 }
263 break;
264
265 case EV_KEY:
266 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
267
268 /* auto-repeat bypasses state updates */
269 if (value == 2) {
270 disposition = INPUT_PASS_TO_HANDLERS;
271 break;
272 }
273
274 if (!!test_bit(code, dev->key) != !!value) {
275
276 __change_bit(code, dev->key);
277 disposition = INPUT_PASS_TO_HANDLERS;
278 }
279 }
280 break;
281
282 case EV_SW:
283 if (is_event_supported(code, dev->swbit, SW_MAX) &&
284 !!test_bit(code, dev->sw) != !!value) {
285
286 __change_bit(code, dev->sw);
287 disposition = INPUT_PASS_TO_HANDLERS;
288 }
289 break;
290
291 case EV_ABS:
292 if (is_event_supported(code, dev->absbit, ABS_MAX))
293 disposition = input_handle_abs_event(dev, code, &value);
294
295 break;
296
297 case EV_REL:
298 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
299 disposition = INPUT_PASS_TO_HANDLERS;
300
301 break;
302
303 case EV_MSC:
304 if (is_event_supported(code, dev->mscbit, MSC_MAX))
305 disposition = INPUT_PASS_TO_ALL;
306
307 break;
308
309 case EV_LED:
310 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
311 !!test_bit(code, dev->led) != !!value) {
312
313 __change_bit(code, dev->led);
314 disposition = INPUT_PASS_TO_ALL;
315 }
316 break;
317
318 case EV_SND:
319 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
320
321 if (!!test_bit(code, dev->snd) != !!value)
322 __change_bit(code, dev->snd);
323 disposition = INPUT_PASS_TO_ALL;
324 }
325 break;
326
327 case EV_REP:
328 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
329 dev->rep[code] = value;
330 disposition = INPUT_PASS_TO_ALL;
331 }
332 break;
333
334 case EV_FF:
335 if (value >= 0)
336 disposition = INPUT_PASS_TO_ALL;
337 break;
338
339 case EV_PWR:
340 disposition = INPUT_PASS_TO_ALL;
341 break;
342 }
343
344 *pval = value;
345 return disposition;
346}
347
348static void input_event_dispose(struct input_dev *dev, int disposition,
349 unsigned int type, unsigned int code, int value)
350{
351 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
352 dev->event(dev, type, code, value);
353
354 if (!dev->vals)
355 return;
356
357 if (disposition & INPUT_PASS_TO_HANDLERS) {
358 struct input_value *v;
359
360 if (disposition & INPUT_SLOT) {
361 v = &dev->vals[dev->num_vals++];
362 v->type = EV_ABS;
363 v->code = ABS_MT_SLOT;
364 v->value = dev->mt->slot;
365 }
366
367 v = &dev->vals[dev->num_vals++];
368 v->type = type;
369 v->code = code;
370 v->value = value;
371 }
372
373 if (disposition & INPUT_FLUSH) {
374 if (dev->num_vals >= 2)
375 input_pass_values(dev, dev->vals, dev->num_vals);
376 dev->num_vals = 0;
377 /*
378 * Reset the timestamp on flush so we won't end up
379 * with a stale one. Note we only need to reset the
380 * monolithic one as we use its presence when deciding
381 * whether to generate a synthetic timestamp.
382 */
383 dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);
384 } else if (dev->num_vals >= dev->max_vals - 2) {
385 dev->vals[dev->num_vals++] = input_value_sync;
386 input_pass_values(dev, dev->vals, dev->num_vals);
387 dev->num_vals = 0;
388 }
389}
390
391void input_handle_event(struct input_dev *dev,
392 unsigned int type, unsigned int code, int value)
393{
394 int disposition;
395
396 lockdep_assert_held(&dev->event_lock);
397
398 disposition = input_get_disposition(dev, type, code, &value);
399 if (disposition != INPUT_IGNORE_EVENT) {
400 if (type != EV_SYN)
401 add_input_randomness(type, code, value);
402
403 input_event_dispose(dev, disposition, type, code, value);
404 }
405}
406
407/**
408 * input_event() - report new input event
409 * @dev: device that generated the event
410 * @type: type of the event
411 * @code: event code
412 * @value: value of the event
413 *
414 * This function should be used by drivers implementing various input
415 * devices to report input events. See also input_inject_event().
416 *
417 * NOTE: input_event() may be safely used right after input device was
418 * allocated with input_allocate_device(), even before it is registered
419 * with input_register_device(), but the event will not reach any of the
420 * input handlers. Such early invocation of input_event() may be used
421 * to 'seed' initial state of a switch or initial position of absolute
422 * axis, etc.
423 */
424void input_event(struct input_dev *dev,
425 unsigned int type, unsigned int code, int value)
426{
427 unsigned long flags;
428
429 if (is_event_supported(type, dev->evbit, EV_MAX)) {
430
431 spin_lock_irqsave(&dev->event_lock, flags);
432 input_handle_event(dev, type, code, value);
433 spin_unlock_irqrestore(&dev->event_lock, flags);
434 }
435}
436EXPORT_SYMBOL(input_event);
437
438/**
439 * input_inject_event() - send input event from input handler
440 * @handle: input handle to send event through
441 * @type: type of the event
442 * @code: event code
443 * @value: value of the event
444 *
445 * Similar to input_event() but will ignore event if device is
446 * "grabbed" and handle injecting event is not the one that owns
447 * the device.
448 */
449void input_inject_event(struct input_handle *handle,
450 unsigned int type, unsigned int code, int value)
451{
452 struct input_dev *dev = handle->dev;
453 struct input_handle *grab;
454 unsigned long flags;
455
456 if (is_event_supported(type, dev->evbit, EV_MAX)) {
457 spin_lock_irqsave(&dev->event_lock, flags);
458
459 rcu_read_lock();
460 grab = rcu_dereference(dev->grab);
461 if (!grab || grab == handle)
462 input_handle_event(dev, type, code, value);
463 rcu_read_unlock();
464
465 spin_unlock_irqrestore(&dev->event_lock, flags);
466 }
467}
468EXPORT_SYMBOL(input_inject_event);
469
470/**
471 * input_alloc_absinfo - allocates array of input_absinfo structs
472 * @dev: the input device emitting absolute events
473 *
474 * If the absinfo struct the caller asked for is already allocated, this
475 * functions will not do anything.
476 */
477void input_alloc_absinfo(struct input_dev *dev)
478{
479 if (dev->absinfo)
480 return;
481
482 dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);
483 if (!dev->absinfo) {
484 dev_err(dev->dev.parent ?: &dev->dev,
485 "%s: unable to allocate memory\n", __func__);
486 /*
487 * We will handle this allocation failure in
488 * input_register_device() when we refuse to register input
489 * device with ABS bits but without absinfo.
490 */
491 }
492}
493EXPORT_SYMBOL(input_alloc_absinfo);
494
495void input_set_abs_params(struct input_dev *dev, unsigned int axis,
496 int min, int max, int fuzz, int flat)
497{
498 struct input_absinfo *absinfo;
499
500 __set_bit(EV_ABS, dev->evbit);
501 __set_bit(axis, dev->absbit);
502
503 input_alloc_absinfo(dev);
504 if (!dev->absinfo)
505 return;
506
507 absinfo = &dev->absinfo[axis];
508 absinfo->minimum = min;
509 absinfo->maximum = max;
510 absinfo->fuzz = fuzz;
511 absinfo->flat = flat;
512}
513EXPORT_SYMBOL(input_set_abs_params);
514
515/**
516 * input_copy_abs - Copy absinfo from one input_dev to another
517 * @dst: Destination input device to copy the abs settings to
518 * @dst_axis: ABS_* value selecting the destination axis
519 * @src: Source input device to copy the abs settings from
520 * @src_axis: ABS_* value selecting the source axis
521 *
522 * Set absinfo for the selected destination axis by copying it from
523 * the specified source input device's source axis.
524 * This is useful to e.g. setup a pen/stylus input-device for combined
525 * touchscreen/pen hardware where the pen uses the same coordinates as
526 * the touchscreen.
527 */
528void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
529 const struct input_dev *src, unsigned int src_axis)
530{
531 /* src must have EV_ABS and src_axis set */
532 if (WARN_ON(!(test_bit(EV_ABS, src->evbit) &&
533 test_bit(src_axis, src->absbit))))
534 return;
535
536 /*
537 * input_alloc_absinfo() may have failed for the source. Our caller is
538 * expected to catch this when registering the input devices, which may
539 * happen after the input_copy_abs() call.
540 */
541 if (!src->absinfo)
542 return;
543
544 input_set_capability(dst, EV_ABS, dst_axis);
545 if (!dst->absinfo)
546 return;
547
548 dst->absinfo[dst_axis] = src->absinfo[src_axis];
549}
550EXPORT_SYMBOL(input_copy_abs);
551
552/**
553 * input_grab_device - grabs device for exclusive use
554 * @handle: input handle that wants to own the device
555 *
556 * When a device is grabbed by an input handle all events generated by
557 * the device are delivered only to this handle. Also events injected
558 * by other input handles are ignored while device is grabbed.
559 */
560int input_grab_device(struct input_handle *handle)
561{
562 struct input_dev *dev = handle->dev;
563 int retval;
564
565 retval = mutex_lock_interruptible(&dev->mutex);
566 if (retval)
567 return retval;
568
569 if (dev->grab) {
570 retval = -EBUSY;
571 goto out;
572 }
573
574 rcu_assign_pointer(dev->grab, handle);
575
576 out:
577 mutex_unlock(&dev->mutex);
578 return retval;
579}
580EXPORT_SYMBOL(input_grab_device);
581
582static void __input_release_device(struct input_handle *handle)
583{
584 struct input_dev *dev = handle->dev;
585 struct input_handle *grabber;
586
587 grabber = rcu_dereference_protected(dev->grab,
588 lockdep_is_held(&dev->mutex));
589 if (grabber == handle) {
590 rcu_assign_pointer(dev->grab, NULL);
591 /* Make sure input_pass_values() notices that grab is gone */
592 synchronize_rcu();
593
594 list_for_each_entry(handle, &dev->h_list, d_node)
595 if (handle->open && handle->handler->start)
596 handle->handler->start(handle);
597 }
598}
599
600/**
601 * input_release_device - release previously grabbed device
602 * @handle: input handle that owns the device
603 *
604 * Releases previously grabbed device so that other input handles can
605 * start receiving input events. Upon release all handlers attached
606 * to the device have their start() method called so they have a change
607 * to synchronize device state with the rest of the system.
608 */
609void input_release_device(struct input_handle *handle)
610{
611 struct input_dev *dev = handle->dev;
612
613 mutex_lock(&dev->mutex);
614 __input_release_device(handle);
615 mutex_unlock(&dev->mutex);
616}
617EXPORT_SYMBOL(input_release_device);
618
619/**
620 * input_open_device - open input device
621 * @handle: handle through which device is being accessed
622 *
623 * This function should be called by input handlers when they
624 * want to start receive events from given input device.
625 */
626int input_open_device(struct input_handle *handle)
627{
628 struct input_dev *dev = handle->dev;
629 int retval;
630
631 retval = mutex_lock_interruptible(&dev->mutex);
632 if (retval)
633 return retval;
634
635 if (dev->going_away) {
636 retval = -ENODEV;
637 goto out;
638 }
639
640 handle->open++;
641
642 if (dev->users++ || dev->inhibited) {
643 /*
644 * Device is already opened and/or inhibited,
645 * so we can exit immediately and report success.
646 */
647 goto out;
648 }
649
650 if (dev->open) {
651 retval = dev->open(dev);
652 if (retval) {
653 dev->users--;
654 handle->open--;
655 /*
656 * Make sure we are not delivering any more events
657 * through this handle
658 */
659 synchronize_rcu();
660 goto out;
661 }
662 }
663
664 if (dev->poller)
665 input_dev_poller_start(dev->poller);
666
667 out:
668 mutex_unlock(&dev->mutex);
669 return retval;
670}
671EXPORT_SYMBOL(input_open_device);
672
673int input_flush_device(struct input_handle *handle, struct file *file)
674{
675 struct input_dev *dev = handle->dev;
676 int retval;
677
678 retval = mutex_lock_interruptible(&dev->mutex);
679 if (retval)
680 return retval;
681
682 if (dev->flush)
683 retval = dev->flush(dev, file);
684
685 mutex_unlock(&dev->mutex);
686 return retval;
687}
688EXPORT_SYMBOL(input_flush_device);
689
690/**
691 * input_close_device - close input device
692 * @handle: handle through which device is being accessed
693 *
694 * This function should be called by input handlers when they
695 * want to stop receive events from given input device.
696 */
697void input_close_device(struct input_handle *handle)
698{
699 struct input_dev *dev = handle->dev;
700
701 mutex_lock(&dev->mutex);
702
703 __input_release_device(handle);
704
705 if (!dev->inhibited && !--dev->users) {
706 if (dev->poller)
707 input_dev_poller_stop(dev->poller);
708 if (dev->close)
709 dev->close(dev);
710 }
711
712 if (!--handle->open) {
713 /*
714 * synchronize_rcu() makes sure that input_pass_values()
715 * completed and that no more input events are delivered
716 * through this handle
717 */
718 synchronize_rcu();
719 }
720
721 mutex_unlock(&dev->mutex);
722}
723EXPORT_SYMBOL(input_close_device);
724
725/*
726 * Simulate keyup events for all keys that are marked as pressed.
727 * The function must be called with dev->event_lock held.
728 */
729static bool input_dev_release_keys(struct input_dev *dev)
730{
731 bool need_sync = false;
732 int code;
733
734 lockdep_assert_held(&dev->event_lock);
735
736 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
737 for_each_set_bit(code, dev->key, KEY_CNT) {
738 input_handle_event(dev, EV_KEY, code, 0);
739 need_sync = true;
740 }
741 }
742
743 return need_sync;
744}
745
746/*
747 * Prepare device for unregistering
748 */
749static void input_disconnect_device(struct input_dev *dev)
750{
751 struct input_handle *handle;
752
753 /*
754 * Mark device as going away. Note that we take dev->mutex here
755 * not to protect access to dev->going_away but rather to ensure
756 * that there are no threads in the middle of input_open_device()
757 */
758 mutex_lock(&dev->mutex);
759 dev->going_away = true;
760 mutex_unlock(&dev->mutex);
761
762 spin_lock_irq(&dev->event_lock);
763
764 /*
765 * Simulate keyup events for all pressed keys so that handlers
766 * are not left with "stuck" keys. The driver may continue
767 * generate events even after we done here but they will not
768 * reach any handlers.
769 */
770 if (input_dev_release_keys(dev))
771 input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
772
773 list_for_each_entry(handle, &dev->h_list, d_node)
774 handle->open = 0;
775
776 spin_unlock_irq(&dev->event_lock);
777}
778
779/**
780 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
781 * @ke: keymap entry containing scancode to be converted.
782 * @scancode: pointer to the location where converted scancode should
783 * be stored.
784 *
785 * This function is used to convert scancode stored in &struct keymap_entry
786 * into scalar form understood by legacy keymap handling methods. These
787 * methods expect scancodes to be represented as 'unsigned int'.
788 */
789int input_scancode_to_scalar(const struct input_keymap_entry *ke,
790 unsigned int *scancode)
791{
792 switch (ke->len) {
793 case 1:
794 *scancode = *((u8 *)ke->scancode);
795 break;
796
797 case 2:
798 *scancode = *((u16 *)ke->scancode);
799 break;
800
801 case 4:
802 *scancode = *((u32 *)ke->scancode);
803 break;
804
805 default:
806 return -EINVAL;
807 }
808
809 return 0;
810}
811EXPORT_SYMBOL(input_scancode_to_scalar);
812
813/*
814 * Those routines handle the default case where no [gs]etkeycode() is
815 * defined. In this case, an array indexed by the scancode is used.
816 */
817
818static unsigned int input_fetch_keycode(struct input_dev *dev,
819 unsigned int index)
820{
821 switch (dev->keycodesize) {
822 case 1:
823 return ((u8 *)dev->keycode)[index];
824
825 case 2:
826 return ((u16 *)dev->keycode)[index];
827
828 default:
829 return ((u32 *)dev->keycode)[index];
830 }
831}
832
833static int input_default_getkeycode(struct input_dev *dev,
834 struct input_keymap_entry *ke)
835{
836 unsigned int index;
837 int error;
838
839 if (!dev->keycodesize)
840 return -EINVAL;
841
842 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
843 index = ke->index;
844 else {
845 error = input_scancode_to_scalar(ke, &index);
846 if (error)
847 return error;
848 }
849
850 if (index >= dev->keycodemax)
851 return -EINVAL;
852
853 ke->keycode = input_fetch_keycode(dev, index);
854 ke->index = index;
855 ke->len = sizeof(index);
856 memcpy(ke->scancode, &index, sizeof(index));
857
858 return 0;
859}
860
861static int input_default_setkeycode(struct input_dev *dev,
862 const struct input_keymap_entry *ke,
863 unsigned int *old_keycode)
864{
865 unsigned int index;
866 int error;
867 int i;
868
869 if (!dev->keycodesize)
870 return -EINVAL;
871
872 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
873 index = ke->index;
874 } else {
875 error = input_scancode_to_scalar(ke, &index);
876 if (error)
877 return error;
878 }
879
880 if (index >= dev->keycodemax)
881 return -EINVAL;
882
883 if (dev->keycodesize < sizeof(ke->keycode) &&
884 (ke->keycode >> (dev->keycodesize * 8)))
885 return -EINVAL;
886
887 switch (dev->keycodesize) {
888 case 1: {
889 u8 *k = (u8 *)dev->keycode;
890 *old_keycode = k[index];
891 k[index] = ke->keycode;
892 break;
893 }
894 case 2: {
895 u16 *k = (u16 *)dev->keycode;
896 *old_keycode = k[index];
897 k[index] = ke->keycode;
898 break;
899 }
900 default: {
901 u32 *k = (u32 *)dev->keycode;
902 *old_keycode = k[index];
903 k[index] = ke->keycode;
904 break;
905 }
906 }
907
908 if (*old_keycode <= KEY_MAX) {
909 __clear_bit(*old_keycode, dev->keybit);
910 for (i = 0; i < dev->keycodemax; i++) {
911 if (input_fetch_keycode(dev, i) == *old_keycode) {
912 __set_bit(*old_keycode, dev->keybit);
913 /* Setting the bit twice is useless, so break */
914 break;
915 }
916 }
917 }
918
919 __set_bit(ke->keycode, dev->keybit);
920 return 0;
921}
922
923/**
924 * input_get_keycode - retrieve keycode currently mapped to a given scancode
925 * @dev: input device which keymap is being queried
926 * @ke: keymap entry
927 *
928 * This function should be called by anyone interested in retrieving current
929 * keymap. Presently evdev handlers use it.
930 */
931int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
932{
933 unsigned long flags;
934 int retval;
935
936 spin_lock_irqsave(&dev->event_lock, flags);
937 retval = dev->getkeycode(dev, ke);
938 spin_unlock_irqrestore(&dev->event_lock, flags);
939
940 return retval;
941}
942EXPORT_SYMBOL(input_get_keycode);
943
944/**
945 * input_set_keycode - attribute a keycode to a given scancode
946 * @dev: input device which keymap is being updated
947 * @ke: new keymap entry
948 *
949 * This function should be called by anyone needing to update current
950 * keymap. Presently keyboard and evdev handlers use it.
951 */
952int input_set_keycode(struct input_dev *dev,
953 const struct input_keymap_entry *ke)
954{
955 unsigned long flags;
956 unsigned int old_keycode;
957 int retval;
958
959 if (ke->keycode > KEY_MAX)
960 return -EINVAL;
961
962 spin_lock_irqsave(&dev->event_lock, flags);
963
964 retval = dev->setkeycode(dev, ke, &old_keycode);
965 if (retval)
966 goto out;
967
968 /* Make sure KEY_RESERVED did not get enabled. */
969 __clear_bit(KEY_RESERVED, dev->keybit);
970
971 /*
972 * Simulate keyup event if keycode is not present
973 * in the keymap anymore
974 */
975 if (old_keycode > KEY_MAX) {
976 dev_warn(dev->dev.parent ?: &dev->dev,
977 "%s: got too big old keycode %#x\n",
978 __func__, old_keycode);
979 } else if (test_bit(EV_KEY, dev->evbit) &&
980 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
981 __test_and_clear_bit(old_keycode, dev->key)) {
982 /*
983 * We have to use input_event_dispose() here directly instead
984 * of input_handle_event() because the key we want to release
985 * here is considered no longer supported by the device and
986 * input_handle_event() will ignore it.
987 */
988 input_event_dispose(dev, INPUT_PASS_TO_HANDLERS,
989 EV_KEY, old_keycode, 0);
990 input_event_dispose(dev, INPUT_PASS_TO_HANDLERS | INPUT_FLUSH,
991 EV_SYN, SYN_REPORT, 1);
992 }
993
994 out:
995 spin_unlock_irqrestore(&dev->event_lock, flags);
996
997 return retval;
998}
999EXPORT_SYMBOL(input_set_keycode);
1000
1001bool input_match_device_id(const struct input_dev *dev,
1002 const struct input_device_id *id)
1003{
1004 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
1005 if (id->bustype != dev->id.bustype)
1006 return false;
1007
1008 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
1009 if (id->vendor != dev->id.vendor)
1010 return false;
1011
1012 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
1013 if (id->product != dev->id.product)
1014 return false;
1015
1016 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
1017 if (id->version != dev->id.version)
1018 return false;
1019
1020 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
1021 !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
1022 !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
1023 !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
1024 !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
1025 !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
1026 !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
1027 !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
1028 !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
1029 !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
1030 return false;
1031 }
1032
1033 return true;
1034}
1035EXPORT_SYMBOL(input_match_device_id);
1036
1037static const struct input_device_id *input_match_device(struct input_handler *handler,
1038 struct input_dev *dev)
1039{
1040 const struct input_device_id *id;
1041
1042 for (id = handler->id_table; id->flags || id->driver_info; id++) {
1043 if (input_match_device_id(dev, id) &&
1044 (!handler->match || handler->match(handler, dev))) {
1045 return id;
1046 }
1047 }
1048
1049 return NULL;
1050}
1051
1052static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
1053{
1054 const struct input_device_id *id;
1055 int error;
1056
1057 id = input_match_device(handler, dev);
1058 if (!id)
1059 return -ENODEV;
1060
1061 error = handler->connect(handler, dev, id);
1062 if (error && error != -ENODEV)
1063 pr_err("failed to attach handler %s to device %s, error: %d\n",
1064 handler->name, kobject_name(&dev->dev.kobj), error);
1065
1066 return error;
1067}
1068
1069#ifdef CONFIG_COMPAT
1070
1071static int input_bits_to_string(char *buf, int buf_size,
1072 unsigned long bits, bool skip_empty)
1073{
1074 int len = 0;
1075
1076 if (in_compat_syscall()) {
1077 u32 dword = bits >> 32;
1078 if (dword || !skip_empty)
1079 len += snprintf(buf, buf_size, "%x ", dword);
1080
1081 dword = bits & 0xffffffffUL;
1082 if (dword || !skip_empty || len)
1083 len += snprintf(buf + len, max(buf_size - len, 0),
1084 "%x", dword);
1085 } else {
1086 if (bits || !skip_empty)
1087 len += snprintf(buf, buf_size, "%lx", bits);
1088 }
1089
1090 return len;
1091}
1092
1093#else /* !CONFIG_COMPAT */
1094
1095static int input_bits_to_string(char *buf, int buf_size,
1096 unsigned long bits, bool skip_empty)
1097{
1098 return bits || !skip_empty ?
1099 snprintf(buf, buf_size, "%lx", bits) : 0;
1100}
1101
1102#endif
1103
1104#ifdef CONFIG_PROC_FS
1105
1106static struct proc_dir_entry *proc_bus_input_dir;
1107static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1108static int input_devices_state;
1109
1110static inline void input_wakeup_procfs_readers(void)
1111{
1112 input_devices_state++;
1113 wake_up(&input_devices_poll_wait);
1114}
1115
1116static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait)
1117{
1118 poll_wait(file, &input_devices_poll_wait, wait);
1119 if (file->f_version != input_devices_state) {
1120 file->f_version = input_devices_state;
1121 return EPOLLIN | EPOLLRDNORM;
1122 }
1123
1124 return 0;
1125}
1126
1127union input_seq_state {
1128 struct {
1129 unsigned short pos;
1130 bool mutex_acquired;
1131 };
1132 void *p;
1133};
1134
1135static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1136{
1137 union input_seq_state *state = (union input_seq_state *)&seq->private;
1138 int error;
1139
1140 /* We need to fit into seq->private pointer */
1141 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1142
1143 error = mutex_lock_interruptible(&input_mutex);
1144 if (error) {
1145 state->mutex_acquired = false;
1146 return ERR_PTR(error);
1147 }
1148
1149 state->mutex_acquired = true;
1150
1151 return seq_list_start(&input_dev_list, *pos);
1152}
1153
1154static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1155{
1156 return seq_list_next(v, &input_dev_list, pos);
1157}
1158
1159static void input_seq_stop(struct seq_file *seq, void *v)
1160{
1161 union input_seq_state *state = (union input_seq_state *)&seq->private;
1162
1163 if (state->mutex_acquired)
1164 mutex_unlock(&input_mutex);
1165}
1166
1167static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1168 unsigned long *bitmap, int max)
1169{
1170 int i;
1171 bool skip_empty = true;
1172 char buf[18];
1173
1174 seq_printf(seq, "B: %s=", name);
1175
1176 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1177 if (input_bits_to_string(buf, sizeof(buf),
1178 bitmap[i], skip_empty)) {
1179 skip_empty = false;
1180 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1181 }
1182 }
1183
1184 /*
1185 * If no output was produced print a single 0.
1186 */
1187 if (skip_empty)
1188 seq_putc(seq, '0');
1189
1190 seq_putc(seq, '\n');
1191}
1192
1193static int input_devices_seq_show(struct seq_file *seq, void *v)
1194{
1195 struct input_dev *dev = container_of(v, struct input_dev, node);
1196 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1197 struct input_handle *handle;
1198
1199 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1200 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1201
1202 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1203 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1204 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1205 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1206 seq_puts(seq, "H: Handlers=");
1207
1208 list_for_each_entry(handle, &dev->h_list, d_node)
1209 seq_printf(seq, "%s ", handle->name);
1210 seq_putc(seq, '\n');
1211
1212 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1213
1214 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1215 if (test_bit(EV_KEY, dev->evbit))
1216 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1217 if (test_bit(EV_REL, dev->evbit))
1218 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1219 if (test_bit(EV_ABS, dev->evbit))
1220 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1221 if (test_bit(EV_MSC, dev->evbit))
1222 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1223 if (test_bit(EV_LED, dev->evbit))
1224 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1225 if (test_bit(EV_SND, dev->evbit))
1226 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1227 if (test_bit(EV_FF, dev->evbit))
1228 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1229 if (test_bit(EV_SW, dev->evbit))
1230 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1231
1232 seq_putc(seq, '\n');
1233
1234 kfree(path);
1235 return 0;
1236}
1237
1238static const struct seq_operations input_devices_seq_ops = {
1239 .start = input_devices_seq_start,
1240 .next = input_devices_seq_next,
1241 .stop = input_seq_stop,
1242 .show = input_devices_seq_show,
1243};
1244
1245static int input_proc_devices_open(struct inode *inode, struct file *file)
1246{
1247 return seq_open(file, &input_devices_seq_ops);
1248}
1249
1250static const struct proc_ops input_devices_proc_ops = {
1251 .proc_open = input_proc_devices_open,
1252 .proc_poll = input_proc_devices_poll,
1253 .proc_read = seq_read,
1254 .proc_lseek = seq_lseek,
1255 .proc_release = seq_release,
1256};
1257
1258static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1259{
1260 union input_seq_state *state = (union input_seq_state *)&seq->private;
1261 int error;
1262
1263 /* We need to fit into seq->private pointer */
1264 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1265
1266 error = mutex_lock_interruptible(&input_mutex);
1267 if (error) {
1268 state->mutex_acquired = false;
1269 return ERR_PTR(error);
1270 }
1271
1272 state->mutex_acquired = true;
1273 state->pos = *pos;
1274
1275 return seq_list_start(&input_handler_list, *pos);
1276}
1277
1278static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1279{
1280 union input_seq_state *state = (union input_seq_state *)&seq->private;
1281
1282 state->pos = *pos + 1;
1283 return seq_list_next(v, &input_handler_list, pos);
1284}
1285
1286static int input_handlers_seq_show(struct seq_file *seq, void *v)
1287{
1288 struct input_handler *handler = container_of(v, struct input_handler, node);
1289 union input_seq_state *state = (union input_seq_state *)&seq->private;
1290
1291 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1292 if (handler->filter)
1293 seq_puts(seq, " (filter)");
1294 if (handler->legacy_minors)
1295 seq_printf(seq, " Minor=%d", handler->minor);
1296 seq_putc(seq, '\n');
1297
1298 return 0;
1299}
1300
1301static const struct seq_operations input_handlers_seq_ops = {
1302 .start = input_handlers_seq_start,
1303 .next = input_handlers_seq_next,
1304 .stop = input_seq_stop,
1305 .show = input_handlers_seq_show,
1306};
1307
1308static int input_proc_handlers_open(struct inode *inode, struct file *file)
1309{
1310 return seq_open(file, &input_handlers_seq_ops);
1311}
1312
1313static const struct proc_ops input_handlers_proc_ops = {
1314 .proc_open = input_proc_handlers_open,
1315 .proc_read = seq_read,
1316 .proc_lseek = seq_lseek,
1317 .proc_release = seq_release,
1318};
1319
1320static int __init input_proc_init(void)
1321{
1322 struct proc_dir_entry *entry;
1323
1324 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1325 if (!proc_bus_input_dir)
1326 return -ENOMEM;
1327
1328 entry = proc_create("devices", 0, proc_bus_input_dir,
1329 &input_devices_proc_ops);
1330 if (!entry)
1331 goto fail1;
1332
1333 entry = proc_create("handlers", 0, proc_bus_input_dir,
1334 &input_handlers_proc_ops);
1335 if (!entry)
1336 goto fail2;
1337
1338 return 0;
1339
1340 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1341 fail1: remove_proc_entry("bus/input", NULL);
1342 return -ENOMEM;
1343}
1344
1345static void input_proc_exit(void)
1346{
1347 remove_proc_entry("devices", proc_bus_input_dir);
1348 remove_proc_entry("handlers", proc_bus_input_dir);
1349 remove_proc_entry("bus/input", NULL);
1350}
1351
1352#else /* !CONFIG_PROC_FS */
1353static inline void input_wakeup_procfs_readers(void) { }
1354static inline int input_proc_init(void) { return 0; }
1355static inline void input_proc_exit(void) { }
1356#endif
1357
1358#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1359static ssize_t input_dev_show_##name(struct device *dev, \
1360 struct device_attribute *attr, \
1361 char *buf) \
1362{ \
1363 struct input_dev *input_dev = to_input_dev(dev); \
1364 \
1365 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1366 input_dev->name ? input_dev->name : ""); \
1367} \
1368static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1369
1370INPUT_DEV_STRING_ATTR_SHOW(name);
1371INPUT_DEV_STRING_ATTR_SHOW(phys);
1372INPUT_DEV_STRING_ATTR_SHOW(uniq);
1373
1374static int input_print_modalias_bits(char *buf, int size,
1375 char name, unsigned long *bm,
1376 unsigned int min_bit, unsigned int max_bit)
1377{
1378 int len = 0, i;
1379
1380 len += snprintf(buf, max(size, 0), "%c", name);
1381 for (i = min_bit; i < max_bit; i++)
1382 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1383 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1384 return len;
1385}
1386
1387static int input_print_modalias(char *buf, int size, struct input_dev *id,
1388 int add_cr)
1389{
1390 int len;
1391
1392 len = snprintf(buf, max(size, 0),
1393 "input:b%04Xv%04Xp%04Xe%04X-",
1394 id->id.bustype, id->id.vendor,
1395 id->id.product, id->id.version);
1396
1397 len += input_print_modalias_bits(buf + len, size - len,
1398 'e', id->evbit, 0, EV_MAX);
1399 len += input_print_modalias_bits(buf + len, size - len,
1400 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1401 len += input_print_modalias_bits(buf + len, size - len,
1402 'r', id->relbit, 0, REL_MAX);
1403 len += input_print_modalias_bits(buf + len, size - len,
1404 'a', id->absbit, 0, ABS_MAX);
1405 len += input_print_modalias_bits(buf + len, size - len,
1406 'm', id->mscbit, 0, MSC_MAX);
1407 len += input_print_modalias_bits(buf + len, size - len,
1408 'l', id->ledbit, 0, LED_MAX);
1409 len += input_print_modalias_bits(buf + len, size - len,
1410 's', id->sndbit, 0, SND_MAX);
1411 len += input_print_modalias_bits(buf + len, size - len,
1412 'f', id->ffbit, 0, FF_MAX);
1413 len += input_print_modalias_bits(buf + len, size - len,
1414 'w', id->swbit, 0, SW_MAX);
1415
1416 if (add_cr)
1417 len += snprintf(buf + len, max(size - len, 0), "\n");
1418
1419 return len;
1420}
1421
1422static ssize_t input_dev_show_modalias(struct device *dev,
1423 struct device_attribute *attr,
1424 char *buf)
1425{
1426 struct input_dev *id = to_input_dev(dev);
1427 ssize_t len;
1428
1429 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1430
1431 return min_t(int, len, PAGE_SIZE);
1432}
1433static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1434
1435static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1436 int max, int add_cr);
1437
1438static ssize_t input_dev_show_properties(struct device *dev,
1439 struct device_attribute *attr,
1440 char *buf)
1441{
1442 struct input_dev *input_dev = to_input_dev(dev);
1443 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1444 INPUT_PROP_MAX, true);
1445 return min_t(int, len, PAGE_SIZE);
1446}
1447static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1448
1449static int input_inhibit_device(struct input_dev *dev);
1450static int input_uninhibit_device(struct input_dev *dev);
1451
1452static ssize_t inhibited_show(struct device *dev,
1453 struct device_attribute *attr,
1454 char *buf)
1455{
1456 struct input_dev *input_dev = to_input_dev(dev);
1457
1458 return scnprintf(buf, PAGE_SIZE, "%d\n", input_dev->inhibited);
1459}
1460
1461static ssize_t inhibited_store(struct device *dev,
1462 struct device_attribute *attr, const char *buf,
1463 size_t len)
1464{
1465 struct input_dev *input_dev = to_input_dev(dev);
1466 ssize_t rv;
1467 bool inhibited;
1468
1469 if (kstrtobool(buf, &inhibited))
1470 return -EINVAL;
1471
1472 if (inhibited)
1473 rv = input_inhibit_device(input_dev);
1474 else
1475 rv = input_uninhibit_device(input_dev);
1476
1477 if (rv != 0)
1478 return rv;
1479
1480 return len;
1481}
1482
1483static DEVICE_ATTR_RW(inhibited);
1484
1485static struct attribute *input_dev_attrs[] = {
1486 &dev_attr_name.attr,
1487 &dev_attr_phys.attr,
1488 &dev_attr_uniq.attr,
1489 &dev_attr_modalias.attr,
1490 &dev_attr_properties.attr,
1491 &dev_attr_inhibited.attr,
1492 NULL
1493};
1494
1495static const struct attribute_group input_dev_attr_group = {
1496 .attrs = input_dev_attrs,
1497};
1498
1499#define INPUT_DEV_ID_ATTR(name) \
1500static ssize_t input_dev_show_id_##name(struct device *dev, \
1501 struct device_attribute *attr, \
1502 char *buf) \
1503{ \
1504 struct input_dev *input_dev = to_input_dev(dev); \
1505 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1506} \
1507static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1508
1509INPUT_DEV_ID_ATTR(bustype);
1510INPUT_DEV_ID_ATTR(vendor);
1511INPUT_DEV_ID_ATTR(product);
1512INPUT_DEV_ID_ATTR(version);
1513
1514static struct attribute *input_dev_id_attrs[] = {
1515 &dev_attr_bustype.attr,
1516 &dev_attr_vendor.attr,
1517 &dev_attr_product.attr,
1518 &dev_attr_version.attr,
1519 NULL
1520};
1521
1522static const struct attribute_group input_dev_id_attr_group = {
1523 .name = "id",
1524 .attrs = input_dev_id_attrs,
1525};
1526
1527static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1528 int max, int add_cr)
1529{
1530 int i;
1531 int len = 0;
1532 bool skip_empty = true;
1533
1534 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1535 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1536 bitmap[i], skip_empty);
1537 if (len) {
1538 skip_empty = false;
1539 if (i > 0)
1540 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1541 }
1542 }
1543
1544 /*
1545 * If no output was produced print a single 0.
1546 */
1547 if (len == 0)
1548 len = snprintf(buf, buf_size, "%d", 0);
1549
1550 if (add_cr)
1551 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1552
1553 return len;
1554}
1555
1556#define INPUT_DEV_CAP_ATTR(ev, bm) \
1557static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1558 struct device_attribute *attr, \
1559 char *buf) \
1560{ \
1561 struct input_dev *input_dev = to_input_dev(dev); \
1562 int len = input_print_bitmap(buf, PAGE_SIZE, \
1563 input_dev->bm##bit, ev##_MAX, \
1564 true); \
1565 return min_t(int, len, PAGE_SIZE); \
1566} \
1567static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1568
1569INPUT_DEV_CAP_ATTR(EV, ev);
1570INPUT_DEV_CAP_ATTR(KEY, key);
1571INPUT_DEV_CAP_ATTR(REL, rel);
1572INPUT_DEV_CAP_ATTR(ABS, abs);
1573INPUT_DEV_CAP_ATTR(MSC, msc);
1574INPUT_DEV_CAP_ATTR(LED, led);
1575INPUT_DEV_CAP_ATTR(SND, snd);
1576INPUT_DEV_CAP_ATTR(FF, ff);
1577INPUT_DEV_CAP_ATTR(SW, sw);
1578
1579static struct attribute *input_dev_caps_attrs[] = {
1580 &dev_attr_ev.attr,
1581 &dev_attr_key.attr,
1582 &dev_attr_rel.attr,
1583 &dev_attr_abs.attr,
1584 &dev_attr_msc.attr,
1585 &dev_attr_led.attr,
1586 &dev_attr_snd.attr,
1587 &dev_attr_ff.attr,
1588 &dev_attr_sw.attr,
1589 NULL
1590};
1591
1592static const struct attribute_group input_dev_caps_attr_group = {
1593 .name = "capabilities",
1594 .attrs = input_dev_caps_attrs,
1595};
1596
1597static const struct attribute_group *input_dev_attr_groups[] = {
1598 &input_dev_attr_group,
1599 &input_dev_id_attr_group,
1600 &input_dev_caps_attr_group,
1601 &input_poller_attribute_group,
1602 NULL
1603};
1604
1605static void input_dev_release(struct device *device)
1606{
1607 struct input_dev *dev = to_input_dev(device);
1608
1609 input_ff_destroy(dev);
1610 input_mt_destroy_slots(dev);
1611 kfree(dev->poller);
1612 kfree(dev->absinfo);
1613 kfree(dev->vals);
1614 kfree(dev);
1615
1616 module_put(THIS_MODULE);
1617}
1618
1619/*
1620 * Input uevent interface - loading event handlers based on
1621 * device bitfields.
1622 */
1623static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1624 const char *name, unsigned long *bitmap, int max)
1625{
1626 int len;
1627
1628 if (add_uevent_var(env, "%s", name))
1629 return -ENOMEM;
1630
1631 len = input_print_bitmap(&env->buf[env->buflen - 1],
1632 sizeof(env->buf) - env->buflen,
1633 bitmap, max, false);
1634 if (len >= (sizeof(env->buf) - env->buflen))
1635 return -ENOMEM;
1636
1637 env->buflen += len;
1638 return 0;
1639}
1640
1641static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1642 struct input_dev *dev)
1643{
1644 int len;
1645
1646 if (add_uevent_var(env, "MODALIAS="))
1647 return -ENOMEM;
1648
1649 len = input_print_modalias(&env->buf[env->buflen - 1],
1650 sizeof(env->buf) - env->buflen,
1651 dev, 0);
1652 if (len >= (sizeof(env->buf) - env->buflen))
1653 return -ENOMEM;
1654
1655 env->buflen += len;
1656 return 0;
1657}
1658
1659#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1660 do { \
1661 int err = add_uevent_var(env, fmt, val); \
1662 if (err) \
1663 return err; \
1664 } while (0)
1665
1666#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1667 do { \
1668 int err = input_add_uevent_bm_var(env, name, bm, max); \
1669 if (err) \
1670 return err; \
1671 } while (0)
1672
1673#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1674 do { \
1675 int err = input_add_uevent_modalias_var(env, dev); \
1676 if (err) \
1677 return err; \
1678 } while (0)
1679
1680static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1681{
1682 struct input_dev *dev = to_input_dev(device);
1683
1684 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1685 dev->id.bustype, dev->id.vendor,
1686 dev->id.product, dev->id.version);
1687 if (dev->name)
1688 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1689 if (dev->phys)
1690 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1691 if (dev->uniq)
1692 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1693
1694 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1695
1696 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1697 if (test_bit(EV_KEY, dev->evbit))
1698 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1699 if (test_bit(EV_REL, dev->evbit))
1700 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1701 if (test_bit(EV_ABS, dev->evbit))
1702 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1703 if (test_bit(EV_MSC, dev->evbit))
1704 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1705 if (test_bit(EV_LED, dev->evbit))
1706 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1707 if (test_bit(EV_SND, dev->evbit))
1708 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1709 if (test_bit(EV_FF, dev->evbit))
1710 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1711 if (test_bit(EV_SW, dev->evbit))
1712 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1713
1714 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1715
1716 return 0;
1717}
1718
1719#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1720 do { \
1721 int i; \
1722 bool active; \
1723 \
1724 if (!test_bit(EV_##type, dev->evbit)) \
1725 break; \
1726 \
1727 for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
1728 active = test_bit(i, dev->bits); \
1729 if (!active && !on) \
1730 continue; \
1731 \
1732 dev->event(dev, EV_##type, i, on ? active : 0); \
1733 } \
1734 } while (0)
1735
1736static void input_dev_toggle(struct input_dev *dev, bool activate)
1737{
1738 if (!dev->event)
1739 return;
1740
1741 INPUT_DO_TOGGLE(dev, LED, led, activate);
1742 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1743
1744 if (activate && test_bit(EV_REP, dev->evbit)) {
1745 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1746 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1747 }
1748}
1749
1750/**
1751 * input_reset_device() - reset/restore the state of input device
1752 * @dev: input device whose state needs to be reset
1753 *
1754 * This function tries to reset the state of an opened input device and
1755 * bring internal state and state if the hardware in sync with each other.
1756 * We mark all keys as released, restore LED state, repeat rate, etc.
1757 */
1758void input_reset_device(struct input_dev *dev)
1759{
1760 unsigned long flags;
1761
1762 mutex_lock(&dev->mutex);
1763 spin_lock_irqsave(&dev->event_lock, flags);
1764
1765 input_dev_toggle(dev, true);
1766 if (input_dev_release_keys(dev))
1767 input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
1768
1769 spin_unlock_irqrestore(&dev->event_lock, flags);
1770 mutex_unlock(&dev->mutex);
1771}
1772EXPORT_SYMBOL(input_reset_device);
1773
1774static int input_inhibit_device(struct input_dev *dev)
1775{
1776 mutex_lock(&dev->mutex);
1777
1778 if (dev->inhibited)
1779 goto out;
1780
1781 if (dev->users) {
1782 if (dev->close)
1783 dev->close(dev);
1784 if (dev->poller)
1785 input_dev_poller_stop(dev->poller);
1786 }
1787
1788 spin_lock_irq(&dev->event_lock);
1789 input_mt_release_slots(dev);
1790 input_dev_release_keys(dev);
1791 input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
1792 input_dev_toggle(dev, false);
1793 spin_unlock_irq(&dev->event_lock);
1794
1795 dev->inhibited = true;
1796
1797out:
1798 mutex_unlock(&dev->mutex);
1799 return 0;
1800}
1801
1802static int input_uninhibit_device(struct input_dev *dev)
1803{
1804 int ret = 0;
1805
1806 mutex_lock(&dev->mutex);
1807
1808 if (!dev->inhibited)
1809 goto out;
1810
1811 if (dev->users) {
1812 if (dev->open) {
1813 ret = dev->open(dev);
1814 if (ret)
1815 goto out;
1816 }
1817 if (dev->poller)
1818 input_dev_poller_start(dev->poller);
1819 }
1820
1821 dev->inhibited = false;
1822 spin_lock_irq(&dev->event_lock);
1823 input_dev_toggle(dev, true);
1824 spin_unlock_irq(&dev->event_lock);
1825
1826out:
1827 mutex_unlock(&dev->mutex);
1828 return ret;
1829}
1830
1831#ifdef CONFIG_PM_SLEEP
1832static int input_dev_suspend(struct device *dev)
1833{
1834 struct input_dev *input_dev = to_input_dev(dev);
1835
1836 spin_lock_irq(&input_dev->event_lock);
1837
1838 /*
1839 * Keys that are pressed now are unlikely to be
1840 * still pressed when we resume.
1841 */
1842 if (input_dev_release_keys(input_dev))
1843 input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
1844
1845 /* Turn off LEDs and sounds, if any are active. */
1846 input_dev_toggle(input_dev, false);
1847
1848 spin_unlock_irq(&input_dev->event_lock);
1849
1850 return 0;
1851}
1852
1853static int input_dev_resume(struct device *dev)
1854{
1855 struct input_dev *input_dev = to_input_dev(dev);
1856
1857 spin_lock_irq(&input_dev->event_lock);
1858
1859 /* Restore state of LEDs and sounds, if any were active. */
1860 input_dev_toggle(input_dev, true);
1861
1862 spin_unlock_irq(&input_dev->event_lock);
1863
1864 return 0;
1865}
1866
1867static int input_dev_freeze(struct device *dev)
1868{
1869 struct input_dev *input_dev = to_input_dev(dev);
1870
1871 spin_lock_irq(&input_dev->event_lock);
1872
1873 /*
1874 * Keys that are pressed now are unlikely to be
1875 * still pressed when we resume.
1876 */
1877 if (input_dev_release_keys(input_dev))
1878 input_handle_event(input_dev, EV_SYN, SYN_REPORT, 1);
1879
1880 spin_unlock_irq(&input_dev->event_lock);
1881
1882 return 0;
1883}
1884
1885static int input_dev_poweroff(struct device *dev)
1886{
1887 struct input_dev *input_dev = to_input_dev(dev);
1888
1889 spin_lock_irq(&input_dev->event_lock);
1890
1891 /* Turn off LEDs and sounds, if any are active. */
1892 input_dev_toggle(input_dev, false);
1893
1894 spin_unlock_irq(&input_dev->event_lock);
1895
1896 return 0;
1897}
1898
1899static const struct dev_pm_ops input_dev_pm_ops = {
1900 .suspend = input_dev_suspend,
1901 .resume = input_dev_resume,
1902 .freeze = input_dev_freeze,
1903 .poweroff = input_dev_poweroff,
1904 .restore = input_dev_resume,
1905};
1906#endif /* CONFIG_PM */
1907
1908static const struct device_type input_dev_type = {
1909 .groups = input_dev_attr_groups,
1910 .release = input_dev_release,
1911 .uevent = input_dev_uevent,
1912#ifdef CONFIG_PM_SLEEP
1913 .pm = &input_dev_pm_ops,
1914#endif
1915};
1916
1917static char *input_devnode(const struct device *dev, umode_t *mode)
1918{
1919 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1920}
1921
1922struct class input_class = {
1923 .name = "input",
1924 .devnode = input_devnode,
1925};
1926EXPORT_SYMBOL_GPL(input_class);
1927
1928/**
1929 * input_allocate_device - allocate memory for new input device
1930 *
1931 * Returns prepared struct input_dev or %NULL.
1932 *
1933 * NOTE: Use input_free_device() to free devices that have not been
1934 * registered; input_unregister_device() should be used for already
1935 * registered devices.
1936 */
1937struct input_dev *input_allocate_device(void)
1938{
1939 static atomic_t input_no = ATOMIC_INIT(-1);
1940 struct input_dev *dev;
1941
1942 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1943 if (dev) {
1944 dev->dev.type = &input_dev_type;
1945 dev->dev.class = &input_class;
1946 device_initialize(&dev->dev);
1947 mutex_init(&dev->mutex);
1948 spin_lock_init(&dev->event_lock);
1949 timer_setup(&dev->timer, NULL, 0);
1950 INIT_LIST_HEAD(&dev->h_list);
1951 INIT_LIST_HEAD(&dev->node);
1952
1953 dev_set_name(&dev->dev, "input%lu",
1954 (unsigned long)atomic_inc_return(&input_no));
1955
1956 __module_get(THIS_MODULE);
1957 }
1958
1959 return dev;
1960}
1961EXPORT_SYMBOL(input_allocate_device);
1962
1963struct input_devres {
1964 struct input_dev *input;
1965};
1966
1967static int devm_input_device_match(struct device *dev, void *res, void *data)
1968{
1969 struct input_devres *devres = res;
1970
1971 return devres->input == data;
1972}
1973
1974static void devm_input_device_release(struct device *dev, void *res)
1975{
1976 struct input_devres *devres = res;
1977 struct input_dev *input = devres->input;
1978
1979 dev_dbg(dev, "%s: dropping reference to %s\n",
1980 __func__, dev_name(&input->dev));
1981 input_put_device(input);
1982}
1983
1984/**
1985 * devm_input_allocate_device - allocate managed input device
1986 * @dev: device owning the input device being created
1987 *
1988 * Returns prepared struct input_dev or %NULL.
1989 *
1990 * Managed input devices do not need to be explicitly unregistered or
1991 * freed as it will be done automatically when owner device unbinds from
1992 * its driver (or binding fails). Once managed input device is allocated,
1993 * it is ready to be set up and registered in the same fashion as regular
1994 * input device. There are no special devm_input_device_[un]register()
1995 * variants, regular ones work with both managed and unmanaged devices,
1996 * should you need them. In most cases however, managed input device need
1997 * not be explicitly unregistered or freed.
1998 *
1999 * NOTE: the owner device is set up as parent of input device and users
2000 * should not override it.
2001 */
2002struct input_dev *devm_input_allocate_device(struct device *dev)
2003{
2004 struct input_dev *input;
2005 struct input_devres *devres;
2006
2007 devres = devres_alloc(devm_input_device_release,
2008 sizeof(*devres), GFP_KERNEL);
2009 if (!devres)
2010 return NULL;
2011
2012 input = input_allocate_device();
2013 if (!input) {
2014 devres_free(devres);
2015 return NULL;
2016 }
2017
2018 input->dev.parent = dev;
2019 input->devres_managed = true;
2020
2021 devres->input = input;
2022 devres_add(dev, devres);
2023
2024 return input;
2025}
2026EXPORT_SYMBOL(devm_input_allocate_device);
2027
2028/**
2029 * input_free_device - free memory occupied by input_dev structure
2030 * @dev: input device to free
2031 *
2032 * This function should only be used if input_register_device()
2033 * was not called yet or if it failed. Once device was registered
2034 * use input_unregister_device() and memory will be freed once last
2035 * reference to the device is dropped.
2036 *
2037 * Device should be allocated by input_allocate_device().
2038 *
2039 * NOTE: If there are references to the input device then memory
2040 * will not be freed until last reference is dropped.
2041 */
2042void input_free_device(struct input_dev *dev)
2043{
2044 if (dev) {
2045 if (dev->devres_managed)
2046 WARN_ON(devres_destroy(dev->dev.parent,
2047 devm_input_device_release,
2048 devm_input_device_match,
2049 dev));
2050 input_put_device(dev);
2051 }
2052}
2053EXPORT_SYMBOL(input_free_device);
2054
2055/**
2056 * input_set_timestamp - set timestamp for input events
2057 * @dev: input device to set timestamp for
2058 * @timestamp: the time at which the event has occurred
2059 * in CLOCK_MONOTONIC
2060 *
2061 * This function is intended to provide to the input system a more
2062 * accurate time of when an event actually occurred. The driver should
2063 * call this function as soon as a timestamp is acquired ensuring
2064 * clock conversions in input_set_timestamp are done correctly.
2065 *
2066 * The system entering suspend state between timestamp acquisition and
2067 * calling input_set_timestamp can result in inaccurate conversions.
2068 */
2069void input_set_timestamp(struct input_dev *dev, ktime_t timestamp)
2070{
2071 dev->timestamp[INPUT_CLK_MONO] = timestamp;
2072 dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);
2073 dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,
2074 TK_OFFS_BOOT);
2075}
2076EXPORT_SYMBOL(input_set_timestamp);
2077
2078/**
2079 * input_get_timestamp - get timestamp for input events
2080 * @dev: input device to get timestamp from
2081 *
2082 * A valid timestamp is a timestamp of non-zero value.
2083 */
2084ktime_t *input_get_timestamp(struct input_dev *dev)
2085{
2086 const ktime_t invalid_timestamp = ktime_set(0, 0);
2087
2088 if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))
2089 input_set_timestamp(dev, ktime_get());
2090
2091 return dev->timestamp;
2092}
2093EXPORT_SYMBOL(input_get_timestamp);
2094
2095/**
2096 * input_set_capability - mark device as capable of a certain event
2097 * @dev: device that is capable of emitting or accepting event
2098 * @type: type of the event (EV_KEY, EV_REL, etc...)
2099 * @code: event code
2100 *
2101 * In addition to setting up corresponding bit in appropriate capability
2102 * bitmap the function also adjusts dev->evbit.
2103 */
2104void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
2105{
2106 if (type < EV_CNT && input_max_code[type] &&
2107 code > input_max_code[type]) {
2108 pr_err("%s: invalid code %u for type %u\n", __func__, code,
2109 type);
2110 dump_stack();
2111 return;
2112 }
2113
2114 switch (type) {
2115 case EV_KEY:
2116 __set_bit(code, dev->keybit);
2117 break;
2118
2119 case EV_REL:
2120 __set_bit(code, dev->relbit);
2121 break;
2122
2123 case EV_ABS:
2124 input_alloc_absinfo(dev);
2125 __set_bit(code, dev->absbit);
2126 break;
2127
2128 case EV_MSC:
2129 __set_bit(code, dev->mscbit);
2130 break;
2131
2132 case EV_SW:
2133 __set_bit(code, dev->swbit);
2134 break;
2135
2136 case EV_LED:
2137 __set_bit(code, dev->ledbit);
2138 break;
2139
2140 case EV_SND:
2141 __set_bit(code, dev->sndbit);
2142 break;
2143
2144 case EV_FF:
2145 __set_bit(code, dev->ffbit);
2146 break;
2147
2148 case EV_PWR:
2149 /* do nothing */
2150 break;
2151
2152 default:
2153 pr_err("%s: unknown type %u (code %u)\n", __func__, type, code);
2154 dump_stack();
2155 return;
2156 }
2157
2158 __set_bit(type, dev->evbit);
2159}
2160EXPORT_SYMBOL(input_set_capability);
2161
2162static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
2163{
2164 int mt_slots;
2165 int i;
2166 unsigned int events;
2167
2168 if (dev->mt) {
2169 mt_slots = dev->mt->num_slots;
2170 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
2171 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
2172 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
2173 mt_slots = clamp(mt_slots, 2, 32);
2174 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
2175 mt_slots = 2;
2176 } else {
2177 mt_slots = 0;
2178 }
2179
2180 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
2181
2182 if (test_bit(EV_ABS, dev->evbit))
2183 for_each_set_bit(i, dev->absbit, ABS_CNT)
2184 events += input_is_mt_axis(i) ? mt_slots : 1;
2185
2186 if (test_bit(EV_REL, dev->evbit))
2187 events += bitmap_weight(dev->relbit, REL_CNT);
2188
2189 /* Make room for KEY and MSC events */
2190 events += 7;
2191
2192 return events;
2193}
2194
2195#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
2196 do { \
2197 if (!test_bit(EV_##type, dev->evbit)) \
2198 memset(dev->bits##bit, 0, \
2199 sizeof(dev->bits##bit)); \
2200 } while (0)
2201
2202static void input_cleanse_bitmasks(struct input_dev *dev)
2203{
2204 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2205 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2206 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2207 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2208 INPUT_CLEANSE_BITMASK(dev, LED, led);
2209 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2210 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2211 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2212}
2213
2214static void __input_unregister_device(struct input_dev *dev)
2215{
2216 struct input_handle *handle, *next;
2217
2218 input_disconnect_device(dev);
2219
2220 mutex_lock(&input_mutex);
2221
2222 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2223 handle->handler->disconnect(handle);
2224 WARN_ON(!list_empty(&dev->h_list));
2225
2226 del_timer_sync(&dev->timer);
2227 list_del_init(&dev->node);
2228
2229 input_wakeup_procfs_readers();
2230
2231 mutex_unlock(&input_mutex);
2232
2233 device_del(&dev->dev);
2234}
2235
2236static void devm_input_device_unregister(struct device *dev, void *res)
2237{
2238 struct input_devres *devres = res;
2239 struct input_dev *input = devres->input;
2240
2241 dev_dbg(dev, "%s: unregistering device %s\n",
2242 __func__, dev_name(&input->dev));
2243 __input_unregister_device(input);
2244}
2245
2246/*
2247 * Generate software autorepeat event. Note that we take
2248 * dev->event_lock here to avoid racing with input_event
2249 * which may cause keys get "stuck".
2250 */
2251static void input_repeat_key(struct timer_list *t)
2252{
2253 struct input_dev *dev = from_timer(dev, t, timer);
2254 unsigned long flags;
2255
2256 spin_lock_irqsave(&dev->event_lock, flags);
2257
2258 if (!dev->inhibited &&
2259 test_bit(dev->repeat_key, dev->key) &&
2260 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
2261
2262 input_set_timestamp(dev, ktime_get());
2263 input_handle_event(dev, EV_KEY, dev->repeat_key, 2);
2264 input_handle_event(dev, EV_SYN, SYN_REPORT, 1);
2265
2266 if (dev->rep[REP_PERIOD])
2267 mod_timer(&dev->timer, jiffies +
2268 msecs_to_jiffies(dev->rep[REP_PERIOD]));
2269 }
2270
2271 spin_unlock_irqrestore(&dev->event_lock, flags);
2272}
2273
2274/**
2275 * input_enable_softrepeat - enable software autorepeat
2276 * @dev: input device
2277 * @delay: repeat delay
2278 * @period: repeat period
2279 *
2280 * Enable software autorepeat on the input device.
2281 */
2282void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
2283{
2284 dev->timer.function = input_repeat_key;
2285 dev->rep[REP_DELAY] = delay;
2286 dev->rep[REP_PERIOD] = period;
2287}
2288EXPORT_SYMBOL(input_enable_softrepeat);
2289
2290bool input_device_enabled(struct input_dev *dev)
2291{
2292 lockdep_assert_held(&dev->mutex);
2293
2294 return !dev->inhibited && dev->users > 0;
2295}
2296EXPORT_SYMBOL_GPL(input_device_enabled);
2297
2298/**
2299 * input_register_device - register device with input core
2300 * @dev: device to be registered
2301 *
2302 * This function registers device with input core. The device must be
2303 * allocated with input_allocate_device() and all it's capabilities
2304 * set up before registering.
2305 * If function fails the device must be freed with input_free_device().
2306 * Once device has been successfully registered it can be unregistered
2307 * with input_unregister_device(); input_free_device() should not be
2308 * called in this case.
2309 *
2310 * Note that this function is also used to register managed input devices
2311 * (ones allocated with devm_input_allocate_device()). Such managed input
2312 * devices need not be explicitly unregistered or freed, their tear down
2313 * is controlled by the devres infrastructure. It is also worth noting
2314 * that tear down of managed input devices is internally a 2-step process:
2315 * registered managed input device is first unregistered, but stays in
2316 * memory and can still handle input_event() calls (although events will
2317 * not be delivered anywhere). The freeing of managed input device will
2318 * happen later, when devres stack is unwound to the point where device
2319 * allocation was made.
2320 */
2321int input_register_device(struct input_dev *dev)
2322{
2323 struct input_devres *devres = NULL;
2324 struct input_handler *handler;
2325 unsigned int packet_size;
2326 const char *path;
2327 int error;
2328
2329 if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
2330 dev_err(&dev->dev,
2331 "Absolute device without dev->absinfo, refusing to register\n");
2332 return -EINVAL;
2333 }
2334
2335 if (dev->devres_managed) {
2336 devres = devres_alloc(devm_input_device_unregister,
2337 sizeof(*devres), GFP_KERNEL);
2338 if (!devres)
2339 return -ENOMEM;
2340
2341 devres->input = dev;
2342 }
2343
2344 /* Every input device generates EV_SYN/SYN_REPORT events. */
2345 __set_bit(EV_SYN, dev->evbit);
2346
2347 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2348 __clear_bit(KEY_RESERVED, dev->keybit);
2349
2350 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2351 input_cleanse_bitmasks(dev);
2352
2353 packet_size = input_estimate_events_per_packet(dev);
2354 if (dev->hint_events_per_packet < packet_size)
2355 dev->hint_events_per_packet = packet_size;
2356
2357 dev->max_vals = dev->hint_events_per_packet + 2;
2358 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2359 if (!dev->vals) {
2360 error = -ENOMEM;
2361 goto err_devres_free;
2362 }
2363
2364 /*
2365 * If delay and period are pre-set by the driver, then autorepeating
2366 * is handled by the driver itself and we don't do it in input.c.
2367 */
2368 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
2369 input_enable_softrepeat(dev, 250, 33);
2370
2371 if (!dev->getkeycode)
2372 dev->getkeycode = input_default_getkeycode;
2373
2374 if (!dev->setkeycode)
2375 dev->setkeycode = input_default_setkeycode;
2376
2377 if (dev->poller)
2378 input_dev_poller_finalize(dev->poller);
2379
2380 error = device_add(&dev->dev);
2381 if (error)
2382 goto err_free_vals;
2383
2384 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2385 pr_info("%s as %s\n",
2386 dev->name ? dev->name : "Unspecified device",
2387 path ? path : "N/A");
2388 kfree(path);
2389
2390 error = mutex_lock_interruptible(&input_mutex);
2391 if (error)
2392 goto err_device_del;
2393
2394 list_add_tail(&dev->node, &input_dev_list);
2395
2396 list_for_each_entry(handler, &input_handler_list, node)
2397 input_attach_handler(dev, handler);
2398
2399 input_wakeup_procfs_readers();
2400
2401 mutex_unlock(&input_mutex);
2402
2403 if (dev->devres_managed) {
2404 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2405 __func__, dev_name(&dev->dev));
2406 devres_add(dev->dev.parent, devres);
2407 }
2408 return 0;
2409
2410err_device_del:
2411 device_del(&dev->dev);
2412err_free_vals:
2413 kfree(dev->vals);
2414 dev->vals = NULL;
2415err_devres_free:
2416 devres_free(devres);
2417 return error;
2418}
2419EXPORT_SYMBOL(input_register_device);
2420
2421/**
2422 * input_unregister_device - unregister previously registered device
2423 * @dev: device to be unregistered
2424 *
2425 * This function unregisters an input device. Once device is unregistered
2426 * the caller should not try to access it as it may get freed at any moment.
2427 */
2428void input_unregister_device(struct input_dev *dev)
2429{
2430 if (dev->devres_managed) {
2431 WARN_ON(devres_destroy(dev->dev.parent,
2432 devm_input_device_unregister,
2433 devm_input_device_match,
2434 dev));
2435 __input_unregister_device(dev);
2436 /*
2437 * We do not do input_put_device() here because it will be done
2438 * when 2nd devres fires up.
2439 */
2440 } else {
2441 __input_unregister_device(dev);
2442 input_put_device(dev);
2443 }
2444}
2445EXPORT_SYMBOL(input_unregister_device);
2446
2447/**
2448 * input_register_handler - register a new input handler
2449 * @handler: handler to be registered
2450 *
2451 * This function registers a new input handler (interface) for input
2452 * devices in the system and attaches it to all input devices that
2453 * are compatible with the handler.
2454 */
2455int input_register_handler(struct input_handler *handler)
2456{
2457 struct input_dev *dev;
2458 int error;
2459
2460 error = mutex_lock_interruptible(&input_mutex);
2461 if (error)
2462 return error;
2463
2464 INIT_LIST_HEAD(&handler->h_list);
2465
2466 list_add_tail(&handler->node, &input_handler_list);
2467
2468 list_for_each_entry(dev, &input_dev_list, node)
2469 input_attach_handler(dev, handler);
2470
2471 input_wakeup_procfs_readers();
2472
2473 mutex_unlock(&input_mutex);
2474 return 0;
2475}
2476EXPORT_SYMBOL(input_register_handler);
2477
2478/**
2479 * input_unregister_handler - unregisters an input handler
2480 * @handler: handler to be unregistered
2481 *
2482 * This function disconnects a handler from its input devices and
2483 * removes it from lists of known handlers.
2484 */
2485void input_unregister_handler(struct input_handler *handler)
2486{
2487 struct input_handle *handle, *next;
2488
2489 mutex_lock(&input_mutex);
2490
2491 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2492 handler->disconnect(handle);
2493 WARN_ON(!list_empty(&handler->h_list));
2494
2495 list_del_init(&handler->node);
2496
2497 input_wakeup_procfs_readers();
2498
2499 mutex_unlock(&input_mutex);
2500}
2501EXPORT_SYMBOL(input_unregister_handler);
2502
2503/**
2504 * input_handler_for_each_handle - handle iterator
2505 * @handler: input handler to iterate
2506 * @data: data for the callback
2507 * @fn: function to be called for each handle
2508 *
2509 * Iterate over @bus's list of devices, and call @fn for each, passing
2510 * it @data and stop when @fn returns a non-zero value. The function is
2511 * using RCU to traverse the list and therefore may be using in atomic
2512 * contexts. The @fn callback is invoked from RCU critical section and
2513 * thus must not sleep.
2514 */
2515int input_handler_for_each_handle(struct input_handler *handler, void *data,
2516 int (*fn)(struct input_handle *, void *))
2517{
2518 struct input_handle *handle;
2519 int retval = 0;
2520
2521 rcu_read_lock();
2522
2523 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2524 retval = fn(handle, data);
2525 if (retval)
2526 break;
2527 }
2528
2529 rcu_read_unlock();
2530
2531 return retval;
2532}
2533EXPORT_SYMBOL(input_handler_for_each_handle);
2534
2535/**
2536 * input_register_handle - register a new input handle
2537 * @handle: handle to register
2538 *
2539 * This function puts a new input handle onto device's
2540 * and handler's lists so that events can flow through
2541 * it once it is opened using input_open_device().
2542 *
2543 * This function is supposed to be called from handler's
2544 * connect() method.
2545 */
2546int input_register_handle(struct input_handle *handle)
2547{
2548 struct input_handler *handler = handle->handler;
2549 struct input_dev *dev = handle->dev;
2550 int error;
2551
2552 /*
2553 * We take dev->mutex here to prevent race with
2554 * input_release_device().
2555 */
2556 error = mutex_lock_interruptible(&dev->mutex);
2557 if (error)
2558 return error;
2559
2560 /*
2561 * Filters go to the head of the list, normal handlers
2562 * to the tail.
2563 */
2564 if (handler->filter)
2565 list_add_rcu(&handle->d_node, &dev->h_list);
2566 else
2567 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2568
2569 mutex_unlock(&dev->mutex);
2570
2571 /*
2572 * Since we are supposed to be called from ->connect()
2573 * which is mutually exclusive with ->disconnect()
2574 * we can't be racing with input_unregister_handle()
2575 * and so separate lock is not needed here.
2576 */
2577 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2578
2579 if (handler->start)
2580 handler->start(handle);
2581
2582 return 0;
2583}
2584EXPORT_SYMBOL(input_register_handle);
2585
2586/**
2587 * input_unregister_handle - unregister an input handle
2588 * @handle: handle to unregister
2589 *
2590 * This function removes input handle from device's
2591 * and handler's lists.
2592 *
2593 * This function is supposed to be called from handler's
2594 * disconnect() method.
2595 */
2596void input_unregister_handle(struct input_handle *handle)
2597{
2598 struct input_dev *dev = handle->dev;
2599
2600 list_del_rcu(&handle->h_node);
2601
2602 /*
2603 * Take dev->mutex to prevent race with input_release_device().
2604 */
2605 mutex_lock(&dev->mutex);
2606 list_del_rcu(&handle->d_node);
2607 mutex_unlock(&dev->mutex);
2608
2609 synchronize_rcu();
2610}
2611EXPORT_SYMBOL(input_unregister_handle);
2612
2613/**
2614 * input_get_new_minor - allocates a new input minor number
2615 * @legacy_base: beginning or the legacy range to be searched
2616 * @legacy_num: size of legacy range
2617 * @allow_dynamic: whether we can also take ID from the dynamic range
2618 *
2619 * This function allocates a new device minor for from input major namespace.
2620 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2621 * parameters and whether ID can be allocated from dynamic range if there are
2622 * no free IDs in legacy range.
2623 */
2624int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2625 bool allow_dynamic)
2626{
2627 /*
2628 * This function should be called from input handler's ->connect()
2629 * methods, which are serialized with input_mutex, so no additional
2630 * locking is needed here.
2631 */
2632 if (legacy_base >= 0) {
2633 int minor = ida_simple_get(&input_ida,
2634 legacy_base,
2635 legacy_base + legacy_num,
2636 GFP_KERNEL);
2637 if (minor >= 0 || !allow_dynamic)
2638 return minor;
2639 }
2640
2641 return ida_simple_get(&input_ida,
2642 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2643 GFP_KERNEL);
2644}
2645EXPORT_SYMBOL(input_get_new_minor);
2646
2647/**
2648 * input_free_minor - release previously allocated minor
2649 * @minor: minor to be released
2650 *
2651 * This function releases previously allocated input minor so that it can be
2652 * reused later.
2653 */
2654void input_free_minor(unsigned int minor)
2655{
2656 ida_simple_remove(&input_ida, minor);
2657}
2658EXPORT_SYMBOL(input_free_minor);
2659
2660static int __init input_init(void)
2661{
2662 int err;
2663
2664 err = class_register(&input_class);
2665 if (err) {
2666 pr_err("unable to register input_dev class\n");
2667 return err;
2668 }
2669
2670 err = input_proc_init();
2671 if (err)
2672 goto fail1;
2673
2674 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2675 INPUT_MAX_CHAR_DEVICES, "input");
2676 if (err) {
2677 pr_err("unable to register char major %d", INPUT_MAJOR);
2678 goto fail2;
2679 }
2680
2681 return 0;
2682
2683 fail2: input_proc_exit();
2684 fail1: class_unregister(&input_class);
2685 return err;
2686}
2687
2688static void __exit input_exit(void)
2689{
2690 input_proc_exit();
2691 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2692 INPUT_MAX_CHAR_DEVICES);
2693 class_unregister(&input_class);
2694}
2695
2696subsys_initcall(input_init);
2697module_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 if (handler->filter) {
104 for (v = vals; v != vals + count; v++) {
105 if (handler->filter(handle, v->type, v->code, v->value))
106 continue;
107 if (end != v)
108 *end = *v;
109 end++;
110 }
111 count = end - vals;
112 }
113
114 if (!count)
115 return 0;
116
117 if (handler->events)
118 handler->events(handle, vals, count);
119 else if (handler->event)
120 for (v = vals; v != vals + count; v++)
121 handler->event(handle, v->type, v->code, v->value);
122
123 return count;
124}
125
126/*
127 * Pass values first through all filters and then, if event has not been
128 * filtered out, through all open handles. This function is called with
129 * dev->event_lock held and interrupts disabled.
130 */
131static void input_pass_values(struct input_dev *dev,
132 struct input_value *vals, unsigned int count)
133{
134 struct input_handle *handle;
135 struct input_value *v;
136
137 if (!count)
138 return;
139
140 rcu_read_lock();
141
142 handle = rcu_dereference(dev->grab);
143 if (handle) {
144 count = input_to_handler(handle, vals, count);
145 } else {
146 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
147 if (handle->open) {
148 count = input_to_handler(handle, vals, count);
149 if (!count)
150 break;
151 }
152 }
153
154 rcu_read_unlock();
155
156 /* trigger auto repeat for key events */
157 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
158 for (v = vals; v != vals + count; v++) {
159 if (v->type == EV_KEY && v->value != 2) {
160 if (v->value)
161 input_start_autorepeat(dev, v->code);
162 else
163 input_stop_autorepeat(dev);
164 }
165 }
166 }
167}
168
169static void input_pass_event(struct input_dev *dev,
170 unsigned int type, unsigned int code, int value)
171{
172 struct input_value vals[] = { { type, code, value } };
173
174 input_pass_values(dev, vals, ARRAY_SIZE(vals));
175}
176
177/*
178 * Generate software autorepeat event. Note that we take
179 * dev->event_lock here to avoid racing with input_event
180 * which may cause keys get "stuck".
181 */
182static void input_repeat_key(unsigned long data)
183{
184 struct input_dev *dev = (void *) data;
185 unsigned long flags;
186
187 spin_lock_irqsave(&dev->event_lock, flags);
188
189 if (test_bit(dev->repeat_key, dev->key) &&
190 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
191 struct input_value vals[] = {
192 { EV_KEY, dev->repeat_key, 2 },
193 input_value_sync
194 };
195
196 input_pass_values(dev, vals, ARRAY_SIZE(vals));
197
198 if (dev->rep[REP_PERIOD])
199 mod_timer(&dev->timer, jiffies +
200 msecs_to_jiffies(dev->rep[REP_PERIOD]));
201 }
202
203 spin_unlock_irqrestore(&dev->event_lock, flags);
204}
205
206#define INPUT_IGNORE_EVENT 0
207#define INPUT_PASS_TO_HANDLERS 1
208#define INPUT_PASS_TO_DEVICE 2
209#define INPUT_SLOT 4
210#define INPUT_FLUSH 8
211#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
212
213static int input_handle_abs_event(struct input_dev *dev,
214 unsigned int code, int *pval)
215{
216 struct input_mt *mt = dev->mt;
217 bool is_mt_event;
218 int *pold;
219
220 if (code == ABS_MT_SLOT) {
221 /*
222 * "Stage" the event; we'll flush it later, when we
223 * get actual touch data.
224 */
225 if (mt && *pval >= 0 && *pval < mt->num_slots)
226 mt->slot = *pval;
227
228 return INPUT_IGNORE_EVENT;
229 }
230
231 is_mt_event = input_is_mt_value(code);
232
233 if (!is_mt_event) {
234 pold = &dev->absinfo[code].value;
235 } else if (mt) {
236 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
237 } else {
238 /*
239 * Bypass filtering for multi-touch events when
240 * not employing slots.
241 */
242 pold = NULL;
243 }
244
245 if (pold) {
246 *pval = input_defuzz_abs_event(*pval, *pold,
247 dev->absinfo[code].fuzz);
248 if (*pold == *pval)
249 return INPUT_IGNORE_EVENT;
250
251 *pold = *pval;
252 }
253
254 /* Flush pending "slot" event */
255 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
256 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
257 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
258 }
259
260 return INPUT_PASS_TO_HANDLERS;
261}
262
263static int input_get_disposition(struct input_dev *dev,
264 unsigned int type, unsigned int code, int *pval)
265{
266 int disposition = INPUT_IGNORE_EVENT;
267 int value = *pval;
268
269 switch (type) {
270
271 case EV_SYN:
272 switch (code) {
273 case SYN_CONFIG:
274 disposition = INPUT_PASS_TO_ALL;
275 break;
276
277 case SYN_REPORT:
278 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
279 break;
280 case SYN_MT_REPORT:
281 disposition = INPUT_PASS_TO_HANDLERS;
282 break;
283 }
284 break;
285
286 case EV_KEY:
287 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
288
289 /* auto-repeat bypasses state updates */
290 if (value == 2) {
291 disposition = INPUT_PASS_TO_HANDLERS;
292 break;
293 }
294
295 if (!!test_bit(code, dev->key) != !!value) {
296
297 __change_bit(code, dev->key);
298 disposition = INPUT_PASS_TO_HANDLERS;
299 }
300 }
301 break;
302
303 case EV_SW:
304 if (is_event_supported(code, dev->swbit, SW_MAX) &&
305 !!test_bit(code, dev->sw) != !!value) {
306
307 __change_bit(code, dev->sw);
308 disposition = INPUT_PASS_TO_HANDLERS;
309 }
310 break;
311
312 case EV_ABS:
313 if (is_event_supported(code, dev->absbit, ABS_MAX))
314 disposition = input_handle_abs_event(dev, code, &value);
315
316 break;
317
318 case EV_REL:
319 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
320 disposition = INPUT_PASS_TO_HANDLERS;
321
322 break;
323
324 case EV_MSC:
325 if (is_event_supported(code, dev->mscbit, MSC_MAX))
326 disposition = INPUT_PASS_TO_ALL;
327
328 break;
329
330 case EV_LED:
331 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
332 !!test_bit(code, dev->led) != !!value) {
333
334 __change_bit(code, dev->led);
335 disposition = INPUT_PASS_TO_ALL;
336 }
337 break;
338
339 case EV_SND:
340 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
341
342 if (!!test_bit(code, dev->snd) != !!value)
343 __change_bit(code, dev->snd);
344 disposition = INPUT_PASS_TO_ALL;
345 }
346 break;
347
348 case EV_REP:
349 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
350 dev->rep[code] = value;
351 disposition = INPUT_PASS_TO_ALL;
352 }
353 break;
354
355 case EV_FF:
356 if (value >= 0)
357 disposition = INPUT_PASS_TO_ALL;
358 break;
359
360 case EV_PWR:
361 disposition = INPUT_PASS_TO_ALL;
362 break;
363 }
364
365 *pval = value;
366 return disposition;
367}
368
369static void input_handle_event(struct input_dev *dev,
370 unsigned int type, unsigned int code, int value)
371{
372 int disposition = input_get_disposition(dev, type, code, &value);
373
374 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
375 add_input_randomness(type, code, value);
376
377 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
378 dev->event(dev, type, code, value);
379
380 if (!dev->vals)
381 return;
382
383 if (disposition & INPUT_PASS_TO_HANDLERS) {
384 struct input_value *v;
385
386 if (disposition & INPUT_SLOT) {
387 v = &dev->vals[dev->num_vals++];
388 v->type = EV_ABS;
389 v->code = ABS_MT_SLOT;
390 v->value = dev->mt->slot;
391 }
392
393 v = &dev->vals[dev->num_vals++];
394 v->type = type;
395 v->code = code;
396 v->value = value;
397 }
398
399 if (disposition & INPUT_FLUSH) {
400 if (dev->num_vals >= 2)
401 input_pass_values(dev, dev->vals, dev->num_vals);
402 dev->num_vals = 0;
403 } else if (dev->num_vals >= dev->max_vals - 2) {
404 dev->vals[dev->num_vals++] = input_value_sync;
405 input_pass_values(dev, dev->vals, dev->num_vals);
406 dev->num_vals = 0;
407 }
408
409}
410
411/**
412 * input_event() - report new input event
413 * @dev: device that generated the event
414 * @type: type of the event
415 * @code: event code
416 * @value: value of the event
417 *
418 * This function should be used by drivers implementing various input
419 * devices to report input events. See also input_inject_event().
420 *
421 * NOTE: input_event() may be safely used right after input device was
422 * allocated with input_allocate_device(), even before it is registered
423 * with input_register_device(), but the event will not reach any of the
424 * input handlers. Such early invocation of input_event() may be used
425 * to 'seed' initial state of a switch or initial position of absolute
426 * axis, etc.
427 */
428void input_event(struct input_dev *dev,
429 unsigned int type, unsigned int code, int value)
430{
431 unsigned long flags;
432
433 if (is_event_supported(type, dev->evbit, EV_MAX)) {
434
435 spin_lock_irqsave(&dev->event_lock, flags);
436 input_handle_event(dev, type, code, value);
437 spin_unlock_irqrestore(&dev->event_lock, flags);
438 }
439}
440EXPORT_SYMBOL(input_event);
441
442/**
443 * input_inject_event() - send input event from input handler
444 * @handle: input handle to send event through
445 * @type: type of the event
446 * @code: event code
447 * @value: value of the event
448 *
449 * Similar to input_event() but will ignore event if device is
450 * "grabbed" and handle injecting event is not the one that owns
451 * the device.
452 */
453void input_inject_event(struct input_handle *handle,
454 unsigned int type, unsigned int code, int value)
455{
456 struct input_dev *dev = handle->dev;
457 struct input_handle *grab;
458 unsigned long flags;
459
460 if (is_event_supported(type, dev->evbit, EV_MAX)) {
461 spin_lock_irqsave(&dev->event_lock, flags);
462
463 rcu_read_lock();
464 grab = rcu_dereference(dev->grab);
465 if (!grab || grab == handle)
466 input_handle_event(dev, type, code, value);
467 rcu_read_unlock();
468
469 spin_unlock_irqrestore(&dev->event_lock, flags);
470 }
471}
472EXPORT_SYMBOL(input_inject_event);
473
474/**
475 * input_alloc_absinfo - allocates array of input_absinfo structs
476 * @dev: the input device emitting absolute events
477 *
478 * If the absinfo struct the caller asked for is already allocated, this
479 * functions will not do anything.
480 */
481void input_alloc_absinfo(struct input_dev *dev)
482{
483 if (!dev->absinfo)
484 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
485 GFP_KERNEL);
486
487 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
488}
489EXPORT_SYMBOL(input_alloc_absinfo);
490
491void input_set_abs_params(struct input_dev *dev, unsigned int axis,
492 int min, int max, int fuzz, int flat)
493{
494 struct input_absinfo *absinfo;
495
496 input_alloc_absinfo(dev);
497 if (!dev->absinfo)
498 return;
499
500 absinfo = &dev->absinfo[axis];
501 absinfo->minimum = min;
502 absinfo->maximum = max;
503 absinfo->fuzz = fuzz;
504 absinfo->flat = flat;
505
506 __set_bit(EV_ABS, dev->evbit);
507 __set_bit(axis, dev->absbit);
508}
509EXPORT_SYMBOL(input_set_abs_params);
510
511
512/**
513 * input_grab_device - grabs device for exclusive use
514 * @handle: input handle that wants to own the device
515 *
516 * When a device is grabbed by an input handle all events generated by
517 * the device are delivered only to this handle. Also events injected
518 * by other input handles are ignored while device is grabbed.
519 */
520int input_grab_device(struct input_handle *handle)
521{
522 struct input_dev *dev = handle->dev;
523 int retval;
524
525 retval = mutex_lock_interruptible(&dev->mutex);
526 if (retval)
527 return retval;
528
529 if (dev->grab) {
530 retval = -EBUSY;
531 goto out;
532 }
533
534 rcu_assign_pointer(dev->grab, handle);
535
536 out:
537 mutex_unlock(&dev->mutex);
538 return retval;
539}
540EXPORT_SYMBOL(input_grab_device);
541
542static void __input_release_device(struct input_handle *handle)
543{
544 struct input_dev *dev = handle->dev;
545 struct input_handle *grabber;
546
547 grabber = rcu_dereference_protected(dev->grab,
548 lockdep_is_held(&dev->mutex));
549 if (grabber == handle) {
550 rcu_assign_pointer(dev->grab, NULL);
551 /* Make sure input_pass_event() notices that grab is gone */
552 synchronize_rcu();
553
554 list_for_each_entry(handle, &dev->h_list, d_node)
555 if (handle->open && handle->handler->start)
556 handle->handler->start(handle);
557 }
558}
559
560/**
561 * input_release_device - release previously grabbed device
562 * @handle: input handle that owns the device
563 *
564 * Releases previously grabbed device so that other input handles can
565 * start receiving input events. Upon release all handlers attached
566 * to the device have their start() method called so they have a change
567 * to synchronize device state with the rest of the system.
568 */
569void input_release_device(struct input_handle *handle)
570{
571 struct input_dev *dev = handle->dev;
572
573 mutex_lock(&dev->mutex);
574 __input_release_device(handle);
575 mutex_unlock(&dev->mutex);
576}
577EXPORT_SYMBOL(input_release_device);
578
579/**
580 * input_open_device - open input device
581 * @handle: handle through which device is being accessed
582 *
583 * This function should be called by input handlers when they
584 * want to start receive events from given input device.
585 */
586int input_open_device(struct input_handle *handle)
587{
588 struct input_dev *dev = handle->dev;
589 int retval;
590
591 retval = mutex_lock_interruptible(&dev->mutex);
592 if (retval)
593 return retval;
594
595 if (dev->going_away) {
596 retval = -ENODEV;
597 goto out;
598 }
599
600 handle->open++;
601
602 if (!dev->users++ && dev->open)
603 retval = dev->open(dev);
604
605 if (retval) {
606 dev->users--;
607 if (!--handle->open) {
608 /*
609 * Make sure we are not delivering any more events
610 * through this handle
611 */
612 synchronize_rcu();
613 }
614 }
615
616 out:
617 mutex_unlock(&dev->mutex);
618 return retval;
619}
620EXPORT_SYMBOL(input_open_device);
621
622int input_flush_device(struct input_handle *handle, struct file *file)
623{
624 struct input_dev *dev = handle->dev;
625 int retval;
626
627 retval = mutex_lock_interruptible(&dev->mutex);
628 if (retval)
629 return retval;
630
631 if (dev->flush)
632 retval = dev->flush(dev, file);
633
634 mutex_unlock(&dev->mutex);
635 return retval;
636}
637EXPORT_SYMBOL(input_flush_device);
638
639/**
640 * input_close_device - close input device
641 * @handle: handle through which device is being accessed
642 *
643 * This function should be called by input handlers when they
644 * want to stop receive events from given input device.
645 */
646void input_close_device(struct input_handle *handle)
647{
648 struct input_dev *dev = handle->dev;
649
650 mutex_lock(&dev->mutex);
651
652 __input_release_device(handle);
653
654 if (!--dev->users && dev->close)
655 dev->close(dev);
656
657 if (!--handle->open) {
658 /*
659 * synchronize_rcu() makes sure that input_pass_event()
660 * completed and that no more input events are delivered
661 * through this handle
662 */
663 synchronize_rcu();
664 }
665
666 mutex_unlock(&dev->mutex);
667}
668EXPORT_SYMBOL(input_close_device);
669
670/*
671 * Simulate keyup events for all keys that are marked as pressed.
672 * The function must be called with dev->event_lock held.
673 */
674static void input_dev_release_keys(struct input_dev *dev)
675{
676 bool need_sync = false;
677 int code;
678
679 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
680 for_each_set_bit(code, dev->key, KEY_CNT) {
681 input_pass_event(dev, EV_KEY, code, 0);
682 need_sync = true;
683 }
684
685 if (need_sync)
686 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
687
688 memset(dev->key, 0, sizeof(dev->key));
689 }
690}
691
692/*
693 * Prepare device for unregistering
694 */
695static void input_disconnect_device(struct input_dev *dev)
696{
697 struct input_handle *handle;
698
699 /*
700 * Mark device as going away. Note that we take dev->mutex here
701 * not to protect access to dev->going_away but rather to ensure
702 * that there are no threads in the middle of input_open_device()
703 */
704 mutex_lock(&dev->mutex);
705 dev->going_away = true;
706 mutex_unlock(&dev->mutex);
707
708 spin_lock_irq(&dev->event_lock);
709
710 /*
711 * Simulate keyup events for all pressed keys so that handlers
712 * are not left with "stuck" keys. The driver may continue
713 * generate events even after we done here but they will not
714 * reach any handlers.
715 */
716 input_dev_release_keys(dev);
717
718 list_for_each_entry(handle, &dev->h_list, d_node)
719 handle->open = 0;
720
721 spin_unlock_irq(&dev->event_lock);
722}
723
724/**
725 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
726 * @ke: keymap entry containing scancode to be converted.
727 * @scancode: pointer to the location where converted scancode should
728 * be stored.
729 *
730 * This function is used to convert scancode stored in &struct keymap_entry
731 * into scalar form understood by legacy keymap handling methods. These
732 * methods expect scancodes to be represented as 'unsigned int'.
733 */
734int input_scancode_to_scalar(const struct input_keymap_entry *ke,
735 unsigned int *scancode)
736{
737 switch (ke->len) {
738 case 1:
739 *scancode = *((u8 *)ke->scancode);
740 break;
741
742 case 2:
743 *scancode = *((u16 *)ke->scancode);
744 break;
745
746 case 4:
747 *scancode = *((u32 *)ke->scancode);
748 break;
749
750 default:
751 return -EINVAL;
752 }
753
754 return 0;
755}
756EXPORT_SYMBOL(input_scancode_to_scalar);
757
758/*
759 * Those routines handle the default case where no [gs]etkeycode() is
760 * defined. In this case, an array indexed by the scancode is used.
761 */
762
763static unsigned int input_fetch_keycode(struct input_dev *dev,
764 unsigned int index)
765{
766 switch (dev->keycodesize) {
767 case 1:
768 return ((u8 *)dev->keycode)[index];
769
770 case 2:
771 return ((u16 *)dev->keycode)[index];
772
773 default:
774 return ((u32 *)dev->keycode)[index];
775 }
776}
777
778static int input_default_getkeycode(struct input_dev *dev,
779 struct input_keymap_entry *ke)
780{
781 unsigned int index;
782 int error;
783
784 if (!dev->keycodesize)
785 return -EINVAL;
786
787 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
788 index = ke->index;
789 else {
790 error = input_scancode_to_scalar(ke, &index);
791 if (error)
792 return error;
793 }
794
795 if (index >= dev->keycodemax)
796 return -EINVAL;
797
798 ke->keycode = input_fetch_keycode(dev, index);
799 ke->index = index;
800 ke->len = sizeof(index);
801 memcpy(ke->scancode, &index, sizeof(index));
802
803 return 0;
804}
805
806static int input_default_setkeycode(struct input_dev *dev,
807 const struct input_keymap_entry *ke,
808 unsigned int *old_keycode)
809{
810 unsigned int index;
811 int error;
812 int i;
813
814 if (!dev->keycodesize)
815 return -EINVAL;
816
817 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
818 index = ke->index;
819 } else {
820 error = input_scancode_to_scalar(ke, &index);
821 if (error)
822 return error;
823 }
824
825 if (index >= dev->keycodemax)
826 return -EINVAL;
827
828 if (dev->keycodesize < sizeof(ke->keycode) &&
829 (ke->keycode >> (dev->keycodesize * 8)))
830 return -EINVAL;
831
832 switch (dev->keycodesize) {
833 case 1: {
834 u8 *k = (u8 *)dev->keycode;
835 *old_keycode = k[index];
836 k[index] = ke->keycode;
837 break;
838 }
839 case 2: {
840 u16 *k = (u16 *)dev->keycode;
841 *old_keycode = k[index];
842 k[index] = ke->keycode;
843 break;
844 }
845 default: {
846 u32 *k = (u32 *)dev->keycode;
847 *old_keycode = k[index];
848 k[index] = ke->keycode;
849 break;
850 }
851 }
852
853 __clear_bit(*old_keycode, dev->keybit);
854 __set_bit(ke->keycode, dev->keybit);
855
856 for (i = 0; i < dev->keycodemax; i++) {
857 if (input_fetch_keycode(dev, i) == *old_keycode) {
858 __set_bit(*old_keycode, dev->keybit);
859 break; /* Setting the bit twice is useless, so break */
860 }
861 }
862
863 return 0;
864}
865
866/**
867 * input_get_keycode - retrieve keycode currently mapped to a given scancode
868 * @dev: input device which keymap is being queried
869 * @ke: keymap entry
870 *
871 * This function should be called by anyone interested in retrieving current
872 * keymap. Presently evdev handlers use it.
873 */
874int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
875{
876 unsigned long flags;
877 int retval;
878
879 spin_lock_irqsave(&dev->event_lock, flags);
880 retval = dev->getkeycode(dev, ke);
881 spin_unlock_irqrestore(&dev->event_lock, flags);
882
883 return retval;
884}
885EXPORT_SYMBOL(input_get_keycode);
886
887/**
888 * input_set_keycode - attribute a keycode to a given scancode
889 * @dev: input device which keymap is being updated
890 * @ke: new keymap entry
891 *
892 * This function should be called by anyone needing to update current
893 * keymap. Presently keyboard and evdev handlers use it.
894 */
895int input_set_keycode(struct input_dev *dev,
896 const struct input_keymap_entry *ke)
897{
898 unsigned long flags;
899 unsigned int old_keycode;
900 int retval;
901
902 if (ke->keycode > KEY_MAX)
903 return -EINVAL;
904
905 spin_lock_irqsave(&dev->event_lock, flags);
906
907 retval = dev->setkeycode(dev, ke, &old_keycode);
908 if (retval)
909 goto out;
910
911 /* Make sure KEY_RESERVED did not get enabled. */
912 __clear_bit(KEY_RESERVED, dev->keybit);
913
914 /*
915 * Simulate keyup event if keycode is not present
916 * in the keymap anymore
917 */
918 if (test_bit(EV_KEY, dev->evbit) &&
919 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
920 __test_and_clear_bit(old_keycode, dev->key)) {
921 struct input_value vals[] = {
922 { EV_KEY, old_keycode, 0 },
923 input_value_sync
924 };
925
926 input_pass_values(dev, vals, ARRAY_SIZE(vals));
927 }
928
929 out:
930 spin_unlock_irqrestore(&dev->event_lock, flags);
931
932 return retval;
933}
934EXPORT_SYMBOL(input_set_keycode);
935
936static const struct input_device_id *input_match_device(struct input_handler *handler,
937 struct input_dev *dev)
938{
939 const struct input_device_id *id;
940
941 for (id = handler->id_table; id->flags || id->driver_info; id++) {
942
943 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
944 if (id->bustype != dev->id.bustype)
945 continue;
946
947 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
948 if (id->vendor != dev->id.vendor)
949 continue;
950
951 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
952 if (id->product != dev->id.product)
953 continue;
954
955 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
956 if (id->version != dev->id.version)
957 continue;
958
959 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
960 continue;
961
962 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
963 continue;
964
965 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
966 continue;
967
968 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
969 continue;
970
971 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
972 continue;
973
974 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
975 continue;
976
977 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
978 continue;
979
980 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
981 continue;
982
983 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
984 continue;
985
986 if (!handler->match || handler->match(handler, dev))
987 return id;
988 }
989
990 return NULL;
991}
992
993static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
994{
995 const struct input_device_id *id;
996 int error;
997
998 id = input_match_device(handler, dev);
999 if (!id)
1000 return -ENODEV;
1001
1002 error = handler->connect(handler, dev, id);
1003 if (error && error != -ENODEV)
1004 pr_err("failed to attach handler %s to device %s, error: %d\n",
1005 handler->name, kobject_name(&dev->dev.kobj), error);
1006
1007 return error;
1008}
1009
1010#ifdef CONFIG_COMPAT
1011
1012static int input_bits_to_string(char *buf, int buf_size,
1013 unsigned long bits, bool skip_empty)
1014{
1015 int len = 0;
1016
1017 if (in_compat_syscall()) {
1018 u32 dword = bits >> 32;
1019 if (dword || !skip_empty)
1020 len += snprintf(buf, buf_size, "%x ", dword);
1021
1022 dword = bits & 0xffffffffUL;
1023 if (dword || !skip_empty || len)
1024 len += snprintf(buf + len, max(buf_size - len, 0),
1025 "%x", dword);
1026 } else {
1027 if (bits || !skip_empty)
1028 len += snprintf(buf, buf_size, "%lx", bits);
1029 }
1030
1031 return len;
1032}
1033
1034#else /* !CONFIG_COMPAT */
1035
1036static int input_bits_to_string(char *buf, int buf_size,
1037 unsigned long bits, bool skip_empty)
1038{
1039 return bits || !skip_empty ?
1040 snprintf(buf, buf_size, "%lx", bits) : 0;
1041}
1042
1043#endif
1044
1045#ifdef CONFIG_PROC_FS
1046
1047static struct proc_dir_entry *proc_bus_input_dir;
1048static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1049static int input_devices_state;
1050
1051static inline void input_wakeup_procfs_readers(void)
1052{
1053 input_devices_state++;
1054 wake_up(&input_devices_poll_wait);
1055}
1056
1057static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
1058{
1059 poll_wait(file, &input_devices_poll_wait, wait);
1060 if (file->f_version != input_devices_state) {
1061 file->f_version = input_devices_state;
1062 return POLLIN | POLLRDNORM;
1063 }
1064
1065 return 0;
1066}
1067
1068union input_seq_state {
1069 struct {
1070 unsigned short pos;
1071 bool mutex_acquired;
1072 };
1073 void *p;
1074};
1075
1076static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1077{
1078 union input_seq_state *state = (union input_seq_state *)&seq->private;
1079 int error;
1080
1081 /* We need to fit into seq->private pointer */
1082 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1083
1084 error = mutex_lock_interruptible(&input_mutex);
1085 if (error) {
1086 state->mutex_acquired = false;
1087 return ERR_PTR(error);
1088 }
1089
1090 state->mutex_acquired = true;
1091
1092 return seq_list_start(&input_dev_list, *pos);
1093}
1094
1095static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1096{
1097 return seq_list_next(v, &input_dev_list, pos);
1098}
1099
1100static void input_seq_stop(struct seq_file *seq, void *v)
1101{
1102 union input_seq_state *state = (union input_seq_state *)&seq->private;
1103
1104 if (state->mutex_acquired)
1105 mutex_unlock(&input_mutex);
1106}
1107
1108static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1109 unsigned long *bitmap, int max)
1110{
1111 int i;
1112 bool skip_empty = true;
1113 char buf[18];
1114
1115 seq_printf(seq, "B: %s=", name);
1116
1117 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1118 if (input_bits_to_string(buf, sizeof(buf),
1119 bitmap[i], skip_empty)) {
1120 skip_empty = false;
1121 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1122 }
1123 }
1124
1125 /*
1126 * If no output was produced print a single 0.
1127 */
1128 if (skip_empty)
1129 seq_puts(seq, "0");
1130
1131 seq_putc(seq, '\n');
1132}
1133
1134static int input_devices_seq_show(struct seq_file *seq, void *v)
1135{
1136 struct input_dev *dev = container_of(v, struct input_dev, node);
1137 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1138 struct input_handle *handle;
1139
1140 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1141 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1142
1143 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1144 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1145 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1146 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1147 seq_printf(seq, "H: Handlers=");
1148
1149 list_for_each_entry(handle, &dev->h_list, d_node)
1150 seq_printf(seq, "%s ", handle->name);
1151 seq_putc(seq, '\n');
1152
1153 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1154
1155 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1156 if (test_bit(EV_KEY, dev->evbit))
1157 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1158 if (test_bit(EV_REL, dev->evbit))
1159 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1160 if (test_bit(EV_ABS, dev->evbit))
1161 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1162 if (test_bit(EV_MSC, dev->evbit))
1163 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1164 if (test_bit(EV_LED, dev->evbit))
1165 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1166 if (test_bit(EV_SND, dev->evbit))
1167 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1168 if (test_bit(EV_FF, dev->evbit))
1169 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1170 if (test_bit(EV_SW, dev->evbit))
1171 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1172
1173 seq_putc(seq, '\n');
1174
1175 kfree(path);
1176 return 0;
1177}
1178
1179static const struct seq_operations input_devices_seq_ops = {
1180 .start = input_devices_seq_start,
1181 .next = input_devices_seq_next,
1182 .stop = input_seq_stop,
1183 .show = input_devices_seq_show,
1184};
1185
1186static int input_proc_devices_open(struct inode *inode, struct file *file)
1187{
1188 return seq_open(file, &input_devices_seq_ops);
1189}
1190
1191static const struct file_operations input_devices_fileops = {
1192 .owner = THIS_MODULE,
1193 .open = input_proc_devices_open,
1194 .poll = input_proc_devices_poll,
1195 .read = seq_read,
1196 .llseek = seq_lseek,
1197 .release = seq_release,
1198};
1199
1200static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1201{
1202 union input_seq_state *state = (union input_seq_state *)&seq->private;
1203 int error;
1204
1205 /* We need to fit into seq->private pointer */
1206 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1207
1208 error = mutex_lock_interruptible(&input_mutex);
1209 if (error) {
1210 state->mutex_acquired = false;
1211 return ERR_PTR(error);
1212 }
1213
1214 state->mutex_acquired = true;
1215 state->pos = *pos;
1216
1217 return seq_list_start(&input_handler_list, *pos);
1218}
1219
1220static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1221{
1222 union input_seq_state *state = (union input_seq_state *)&seq->private;
1223
1224 state->pos = *pos + 1;
1225 return seq_list_next(v, &input_handler_list, pos);
1226}
1227
1228static int input_handlers_seq_show(struct seq_file *seq, void *v)
1229{
1230 struct input_handler *handler = container_of(v, struct input_handler, node);
1231 union input_seq_state *state = (union input_seq_state *)&seq->private;
1232
1233 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1234 if (handler->filter)
1235 seq_puts(seq, " (filter)");
1236 if (handler->legacy_minors)
1237 seq_printf(seq, " Minor=%d", handler->minor);
1238 seq_putc(seq, '\n');
1239
1240 return 0;
1241}
1242
1243static const struct seq_operations input_handlers_seq_ops = {
1244 .start = input_handlers_seq_start,
1245 .next = input_handlers_seq_next,
1246 .stop = input_seq_stop,
1247 .show = input_handlers_seq_show,
1248};
1249
1250static int input_proc_handlers_open(struct inode *inode, struct file *file)
1251{
1252 return seq_open(file, &input_handlers_seq_ops);
1253}
1254
1255static const struct file_operations input_handlers_fileops = {
1256 .owner = THIS_MODULE,
1257 .open = input_proc_handlers_open,
1258 .read = seq_read,
1259 .llseek = seq_lseek,
1260 .release = seq_release,
1261};
1262
1263static int __init input_proc_init(void)
1264{
1265 struct proc_dir_entry *entry;
1266
1267 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1268 if (!proc_bus_input_dir)
1269 return -ENOMEM;
1270
1271 entry = proc_create("devices", 0, proc_bus_input_dir,
1272 &input_devices_fileops);
1273 if (!entry)
1274 goto fail1;
1275
1276 entry = proc_create("handlers", 0, proc_bus_input_dir,
1277 &input_handlers_fileops);
1278 if (!entry)
1279 goto fail2;
1280
1281 return 0;
1282
1283 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1284 fail1: remove_proc_entry("bus/input", NULL);
1285 return -ENOMEM;
1286}
1287
1288static void input_proc_exit(void)
1289{
1290 remove_proc_entry("devices", proc_bus_input_dir);
1291 remove_proc_entry("handlers", proc_bus_input_dir);
1292 remove_proc_entry("bus/input", NULL);
1293}
1294
1295#else /* !CONFIG_PROC_FS */
1296static inline void input_wakeup_procfs_readers(void) { }
1297static inline int input_proc_init(void) { return 0; }
1298static inline void input_proc_exit(void) { }
1299#endif
1300
1301#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1302static ssize_t input_dev_show_##name(struct device *dev, \
1303 struct device_attribute *attr, \
1304 char *buf) \
1305{ \
1306 struct input_dev *input_dev = to_input_dev(dev); \
1307 \
1308 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1309 input_dev->name ? input_dev->name : ""); \
1310} \
1311static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1312
1313INPUT_DEV_STRING_ATTR_SHOW(name);
1314INPUT_DEV_STRING_ATTR_SHOW(phys);
1315INPUT_DEV_STRING_ATTR_SHOW(uniq);
1316
1317static int input_print_modalias_bits(char *buf, int size,
1318 char name, unsigned long *bm,
1319 unsigned int min_bit, unsigned int max_bit)
1320{
1321 int len = 0, i;
1322
1323 len += snprintf(buf, max(size, 0), "%c", name);
1324 for (i = min_bit; i < max_bit; i++)
1325 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1326 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1327 return len;
1328}
1329
1330static int input_print_modalias(char *buf, int size, struct input_dev *id,
1331 int add_cr)
1332{
1333 int len;
1334
1335 len = snprintf(buf, max(size, 0),
1336 "input:b%04Xv%04Xp%04Xe%04X-",
1337 id->id.bustype, id->id.vendor,
1338 id->id.product, id->id.version);
1339
1340 len += input_print_modalias_bits(buf + len, size - len,
1341 'e', id->evbit, 0, EV_MAX);
1342 len += input_print_modalias_bits(buf + len, size - len,
1343 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1344 len += input_print_modalias_bits(buf + len, size - len,
1345 'r', id->relbit, 0, REL_MAX);
1346 len += input_print_modalias_bits(buf + len, size - len,
1347 'a', id->absbit, 0, ABS_MAX);
1348 len += input_print_modalias_bits(buf + len, size - len,
1349 'm', id->mscbit, 0, MSC_MAX);
1350 len += input_print_modalias_bits(buf + len, size - len,
1351 'l', id->ledbit, 0, LED_MAX);
1352 len += input_print_modalias_bits(buf + len, size - len,
1353 's', id->sndbit, 0, SND_MAX);
1354 len += input_print_modalias_bits(buf + len, size - len,
1355 'f', id->ffbit, 0, FF_MAX);
1356 len += input_print_modalias_bits(buf + len, size - len,
1357 'w', id->swbit, 0, SW_MAX);
1358
1359 if (add_cr)
1360 len += snprintf(buf + len, max(size - len, 0), "\n");
1361
1362 return len;
1363}
1364
1365static ssize_t input_dev_show_modalias(struct device *dev,
1366 struct device_attribute *attr,
1367 char *buf)
1368{
1369 struct input_dev *id = to_input_dev(dev);
1370 ssize_t len;
1371
1372 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1373
1374 return min_t(int, len, PAGE_SIZE);
1375}
1376static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1377
1378static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1379 int max, int add_cr);
1380
1381static ssize_t input_dev_show_properties(struct device *dev,
1382 struct device_attribute *attr,
1383 char *buf)
1384{
1385 struct input_dev *input_dev = to_input_dev(dev);
1386 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1387 INPUT_PROP_MAX, true);
1388 return min_t(int, len, PAGE_SIZE);
1389}
1390static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1391
1392static struct attribute *input_dev_attrs[] = {
1393 &dev_attr_name.attr,
1394 &dev_attr_phys.attr,
1395 &dev_attr_uniq.attr,
1396 &dev_attr_modalias.attr,
1397 &dev_attr_properties.attr,
1398 NULL
1399};
1400
1401static struct attribute_group input_dev_attr_group = {
1402 .attrs = input_dev_attrs,
1403};
1404
1405#define INPUT_DEV_ID_ATTR(name) \
1406static ssize_t input_dev_show_id_##name(struct device *dev, \
1407 struct device_attribute *attr, \
1408 char *buf) \
1409{ \
1410 struct input_dev *input_dev = to_input_dev(dev); \
1411 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1412} \
1413static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1414
1415INPUT_DEV_ID_ATTR(bustype);
1416INPUT_DEV_ID_ATTR(vendor);
1417INPUT_DEV_ID_ATTR(product);
1418INPUT_DEV_ID_ATTR(version);
1419
1420static struct attribute *input_dev_id_attrs[] = {
1421 &dev_attr_bustype.attr,
1422 &dev_attr_vendor.attr,
1423 &dev_attr_product.attr,
1424 &dev_attr_version.attr,
1425 NULL
1426};
1427
1428static struct attribute_group input_dev_id_attr_group = {
1429 .name = "id",
1430 .attrs = input_dev_id_attrs,
1431};
1432
1433static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1434 int max, int add_cr)
1435{
1436 int i;
1437 int len = 0;
1438 bool skip_empty = true;
1439
1440 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1441 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1442 bitmap[i], skip_empty);
1443 if (len) {
1444 skip_empty = false;
1445 if (i > 0)
1446 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1447 }
1448 }
1449
1450 /*
1451 * If no output was produced print a single 0.
1452 */
1453 if (len == 0)
1454 len = snprintf(buf, buf_size, "%d", 0);
1455
1456 if (add_cr)
1457 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1458
1459 return len;
1460}
1461
1462#define INPUT_DEV_CAP_ATTR(ev, bm) \
1463static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1464 struct device_attribute *attr, \
1465 char *buf) \
1466{ \
1467 struct input_dev *input_dev = to_input_dev(dev); \
1468 int len = input_print_bitmap(buf, PAGE_SIZE, \
1469 input_dev->bm##bit, ev##_MAX, \
1470 true); \
1471 return min_t(int, len, PAGE_SIZE); \
1472} \
1473static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1474
1475INPUT_DEV_CAP_ATTR(EV, ev);
1476INPUT_DEV_CAP_ATTR(KEY, key);
1477INPUT_DEV_CAP_ATTR(REL, rel);
1478INPUT_DEV_CAP_ATTR(ABS, abs);
1479INPUT_DEV_CAP_ATTR(MSC, msc);
1480INPUT_DEV_CAP_ATTR(LED, led);
1481INPUT_DEV_CAP_ATTR(SND, snd);
1482INPUT_DEV_CAP_ATTR(FF, ff);
1483INPUT_DEV_CAP_ATTR(SW, sw);
1484
1485static struct attribute *input_dev_caps_attrs[] = {
1486 &dev_attr_ev.attr,
1487 &dev_attr_key.attr,
1488 &dev_attr_rel.attr,
1489 &dev_attr_abs.attr,
1490 &dev_attr_msc.attr,
1491 &dev_attr_led.attr,
1492 &dev_attr_snd.attr,
1493 &dev_attr_ff.attr,
1494 &dev_attr_sw.attr,
1495 NULL
1496};
1497
1498static struct attribute_group input_dev_caps_attr_group = {
1499 .name = "capabilities",
1500 .attrs = input_dev_caps_attrs,
1501};
1502
1503static const struct attribute_group *input_dev_attr_groups[] = {
1504 &input_dev_attr_group,
1505 &input_dev_id_attr_group,
1506 &input_dev_caps_attr_group,
1507 NULL
1508};
1509
1510static void input_dev_release(struct device *device)
1511{
1512 struct input_dev *dev = to_input_dev(device);
1513
1514 input_ff_destroy(dev);
1515 input_mt_destroy_slots(dev);
1516 kfree(dev->absinfo);
1517 kfree(dev->vals);
1518 kfree(dev);
1519
1520 module_put(THIS_MODULE);
1521}
1522
1523/*
1524 * Input uevent interface - loading event handlers based on
1525 * device bitfields.
1526 */
1527static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1528 const char *name, unsigned long *bitmap, int max)
1529{
1530 int len;
1531
1532 if (add_uevent_var(env, "%s", name))
1533 return -ENOMEM;
1534
1535 len = input_print_bitmap(&env->buf[env->buflen - 1],
1536 sizeof(env->buf) - env->buflen,
1537 bitmap, max, false);
1538 if (len >= (sizeof(env->buf) - env->buflen))
1539 return -ENOMEM;
1540
1541 env->buflen += len;
1542 return 0;
1543}
1544
1545static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1546 struct input_dev *dev)
1547{
1548 int len;
1549
1550 if (add_uevent_var(env, "MODALIAS="))
1551 return -ENOMEM;
1552
1553 len = input_print_modalias(&env->buf[env->buflen - 1],
1554 sizeof(env->buf) - env->buflen,
1555 dev, 0);
1556 if (len >= (sizeof(env->buf) - env->buflen))
1557 return -ENOMEM;
1558
1559 env->buflen += len;
1560 return 0;
1561}
1562
1563#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1564 do { \
1565 int err = add_uevent_var(env, fmt, val); \
1566 if (err) \
1567 return err; \
1568 } while (0)
1569
1570#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1571 do { \
1572 int err = input_add_uevent_bm_var(env, name, bm, max); \
1573 if (err) \
1574 return err; \
1575 } while (0)
1576
1577#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1578 do { \
1579 int err = input_add_uevent_modalias_var(env, dev); \
1580 if (err) \
1581 return err; \
1582 } while (0)
1583
1584static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1585{
1586 struct input_dev *dev = to_input_dev(device);
1587
1588 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1589 dev->id.bustype, dev->id.vendor,
1590 dev->id.product, dev->id.version);
1591 if (dev->name)
1592 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1593 if (dev->phys)
1594 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1595 if (dev->uniq)
1596 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1597
1598 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1599
1600 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1601 if (test_bit(EV_KEY, dev->evbit))
1602 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1603 if (test_bit(EV_REL, dev->evbit))
1604 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1605 if (test_bit(EV_ABS, dev->evbit))
1606 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1607 if (test_bit(EV_MSC, dev->evbit))
1608 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1609 if (test_bit(EV_LED, dev->evbit))
1610 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1611 if (test_bit(EV_SND, dev->evbit))
1612 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1613 if (test_bit(EV_FF, dev->evbit))
1614 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1615 if (test_bit(EV_SW, dev->evbit))
1616 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1617
1618 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1619
1620 return 0;
1621}
1622
1623#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1624 do { \
1625 int i; \
1626 bool active; \
1627 \
1628 if (!test_bit(EV_##type, dev->evbit)) \
1629 break; \
1630 \
1631 for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
1632 active = test_bit(i, dev->bits); \
1633 if (!active && !on) \
1634 continue; \
1635 \
1636 dev->event(dev, EV_##type, i, on ? active : 0); \
1637 } \
1638 } while (0)
1639
1640static void input_dev_toggle(struct input_dev *dev, bool activate)
1641{
1642 if (!dev->event)
1643 return;
1644
1645 INPUT_DO_TOGGLE(dev, LED, led, activate);
1646 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1647
1648 if (activate && test_bit(EV_REP, dev->evbit)) {
1649 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1650 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1651 }
1652}
1653
1654/**
1655 * input_reset_device() - reset/restore the state of input device
1656 * @dev: input device whose state needs to be reset
1657 *
1658 * This function tries to reset the state of an opened input device and
1659 * bring internal state and state if the hardware in sync with each other.
1660 * We mark all keys as released, restore LED state, repeat rate, etc.
1661 */
1662void input_reset_device(struct input_dev *dev)
1663{
1664 unsigned long flags;
1665
1666 mutex_lock(&dev->mutex);
1667 spin_lock_irqsave(&dev->event_lock, flags);
1668
1669 input_dev_toggle(dev, true);
1670 input_dev_release_keys(dev);
1671
1672 spin_unlock_irqrestore(&dev->event_lock, flags);
1673 mutex_unlock(&dev->mutex);
1674}
1675EXPORT_SYMBOL(input_reset_device);
1676
1677#ifdef CONFIG_PM_SLEEP
1678static int input_dev_suspend(struct device *dev)
1679{
1680 struct input_dev *input_dev = to_input_dev(dev);
1681
1682 spin_lock_irq(&input_dev->event_lock);
1683
1684 /*
1685 * Keys that are pressed now are unlikely to be
1686 * still pressed when we resume.
1687 */
1688 input_dev_release_keys(input_dev);
1689
1690 /* Turn off LEDs and sounds, if any are active. */
1691 input_dev_toggle(input_dev, false);
1692
1693 spin_unlock_irq(&input_dev->event_lock);
1694
1695 return 0;
1696}
1697
1698static int input_dev_resume(struct device *dev)
1699{
1700 struct input_dev *input_dev = to_input_dev(dev);
1701
1702 spin_lock_irq(&input_dev->event_lock);
1703
1704 /* Restore state of LEDs and sounds, if any were active. */
1705 input_dev_toggle(input_dev, true);
1706
1707 spin_unlock_irq(&input_dev->event_lock);
1708
1709 return 0;
1710}
1711
1712static int input_dev_freeze(struct device *dev)
1713{
1714 struct input_dev *input_dev = to_input_dev(dev);
1715
1716 spin_lock_irq(&input_dev->event_lock);
1717
1718 /*
1719 * Keys that are pressed now are unlikely to be
1720 * still pressed when we resume.
1721 */
1722 input_dev_release_keys(input_dev);
1723
1724 spin_unlock_irq(&input_dev->event_lock);
1725
1726 return 0;
1727}
1728
1729static int input_dev_poweroff(struct device *dev)
1730{
1731 struct input_dev *input_dev = to_input_dev(dev);
1732
1733 spin_lock_irq(&input_dev->event_lock);
1734
1735 /* Turn off LEDs and sounds, if any are active. */
1736 input_dev_toggle(input_dev, false);
1737
1738 spin_unlock_irq(&input_dev->event_lock);
1739
1740 return 0;
1741}
1742
1743static const struct dev_pm_ops input_dev_pm_ops = {
1744 .suspend = input_dev_suspend,
1745 .resume = input_dev_resume,
1746 .freeze = input_dev_freeze,
1747 .poweroff = input_dev_poweroff,
1748 .restore = input_dev_resume,
1749};
1750#endif /* CONFIG_PM */
1751
1752static struct device_type input_dev_type = {
1753 .groups = input_dev_attr_groups,
1754 .release = input_dev_release,
1755 .uevent = input_dev_uevent,
1756#ifdef CONFIG_PM_SLEEP
1757 .pm = &input_dev_pm_ops,
1758#endif
1759};
1760
1761static char *input_devnode(struct device *dev, umode_t *mode)
1762{
1763 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1764}
1765
1766struct class input_class = {
1767 .name = "input",
1768 .devnode = input_devnode,
1769};
1770EXPORT_SYMBOL_GPL(input_class);
1771
1772/**
1773 * input_allocate_device - allocate memory for new input device
1774 *
1775 * Returns prepared struct input_dev or %NULL.
1776 *
1777 * NOTE: Use input_free_device() to free devices that have not been
1778 * registered; input_unregister_device() should be used for already
1779 * registered devices.
1780 */
1781struct input_dev *input_allocate_device(void)
1782{
1783 static atomic_t input_no = ATOMIC_INIT(-1);
1784 struct input_dev *dev;
1785
1786 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1787 if (dev) {
1788 dev->dev.type = &input_dev_type;
1789 dev->dev.class = &input_class;
1790 device_initialize(&dev->dev);
1791 mutex_init(&dev->mutex);
1792 spin_lock_init(&dev->event_lock);
1793 init_timer(&dev->timer);
1794 INIT_LIST_HEAD(&dev->h_list);
1795 INIT_LIST_HEAD(&dev->node);
1796
1797 dev_set_name(&dev->dev, "input%lu",
1798 (unsigned long)atomic_inc_return(&input_no));
1799
1800 __module_get(THIS_MODULE);
1801 }
1802
1803 return dev;
1804}
1805EXPORT_SYMBOL(input_allocate_device);
1806
1807struct input_devres {
1808 struct input_dev *input;
1809};
1810
1811static int devm_input_device_match(struct device *dev, void *res, void *data)
1812{
1813 struct input_devres *devres = res;
1814
1815 return devres->input == data;
1816}
1817
1818static void devm_input_device_release(struct device *dev, void *res)
1819{
1820 struct input_devres *devres = res;
1821 struct input_dev *input = devres->input;
1822
1823 dev_dbg(dev, "%s: dropping reference to %s\n",
1824 __func__, dev_name(&input->dev));
1825 input_put_device(input);
1826}
1827
1828/**
1829 * devm_input_allocate_device - allocate managed input device
1830 * @dev: device owning the input device being created
1831 *
1832 * Returns prepared struct input_dev or %NULL.
1833 *
1834 * Managed input devices do not need to be explicitly unregistered or
1835 * freed as it will be done automatically when owner device unbinds from
1836 * its driver (or binding fails). Once managed input device is allocated,
1837 * it is ready to be set up and registered in the same fashion as regular
1838 * input device. There are no special devm_input_device_[un]register()
1839 * variants, regular ones work with both managed and unmanaged devices,
1840 * should you need them. In most cases however, managed input device need
1841 * not be explicitly unregistered or freed.
1842 *
1843 * NOTE: the owner device is set up as parent of input device and users
1844 * should not override it.
1845 */
1846struct input_dev *devm_input_allocate_device(struct device *dev)
1847{
1848 struct input_dev *input;
1849 struct input_devres *devres;
1850
1851 devres = devres_alloc(devm_input_device_release,
1852 sizeof(struct input_devres), GFP_KERNEL);
1853 if (!devres)
1854 return NULL;
1855
1856 input = input_allocate_device();
1857 if (!input) {
1858 devres_free(devres);
1859 return NULL;
1860 }
1861
1862 input->dev.parent = dev;
1863 input->devres_managed = true;
1864
1865 devres->input = input;
1866 devres_add(dev, devres);
1867
1868 return input;
1869}
1870EXPORT_SYMBOL(devm_input_allocate_device);
1871
1872/**
1873 * input_free_device - free memory occupied by input_dev structure
1874 * @dev: input device to free
1875 *
1876 * This function should only be used if input_register_device()
1877 * was not called yet or if it failed. Once device was registered
1878 * use input_unregister_device() and memory will be freed once last
1879 * reference to the device is dropped.
1880 *
1881 * Device should be allocated by input_allocate_device().
1882 *
1883 * NOTE: If there are references to the input device then memory
1884 * will not be freed until last reference is dropped.
1885 */
1886void input_free_device(struct input_dev *dev)
1887{
1888 if (dev) {
1889 if (dev->devres_managed)
1890 WARN_ON(devres_destroy(dev->dev.parent,
1891 devm_input_device_release,
1892 devm_input_device_match,
1893 dev));
1894 input_put_device(dev);
1895 }
1896}
1897EXPORT_SYMBOL(input_free_device);
1898
1899/**
1900 * input_set_capability - mark device as capable of a certain event
1901 * @dev: device that is capable of emitting or accepting event
1902 * @type: type of the event (EV_KEY, EV_REL, etc...)
1903 * @code: event code
1904 *
1905 * In addition to setting up corresponding bit in appropriate capability
1906 * bitmap the function also adjusts dev->evbit.
1907 */
1908void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1909{
1910 switch (type) {
1911 case EV_KEY:
1912 __set_bit(code, dev->keybit);
1913 break;
1914
1915 case EV_REL:
1916 __set_bit(code, dev->relbit);
1917 break;
1918
1919 case EV_ABS:
1920 input_alloc_absinfo(dev);
1921 if (!dev->absinfo)
1922 return;
1923
1924 __set_bit(code, dev->absbit);
1925 break;
1926
1927 case EV_MSC:
1928 __set_bit(code, dev->mscbit);
1929 break;
1930
1931 case EV_SW:
1932 __set_bit(code, dev->swbit);
1933 break;
1934
1935 case EV_LED:
1936 __set_bit(code, dev->ledbit);
1937 break;
1938
1939 case EV_SND:
1940 __set_bit(code, dev->sndbit);
1941 break;
1942
1943 case EV_FF:
1944 __set_bit(code, dev->ffbit);
1945 break;
1946
1947 case EV_PWR:
1948 /* do nothing */
1949 break;
1950
1951 default:
1952 pr_err("input_set_capability: unknown type %u (code %u)\n",
1953 type, code);
1954 dump_stack();
1955 return;
1956 }
1957
1958 __set_bit(type, dev->evbit);
1959}
1960EXPORT_SYMBOL(input_set_capability);
1961
1962static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1963{
1964 int mt_slots;
1965 int i;
1966 unsigned int events;
1967
1968 if (dev->mt) {
1969 mt_slots = dev->mt->num_slots;
1970 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1971 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1972 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1973 mt_slots = clamp(mt_slots, 2, 32);
1974 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1975 mt_slots = 2;
1976 } else {
1977 mt_slots = 0;
1978 }
1979
1980 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1981
1982 if (test_bit(EV_ABS, dev->evbit))
1983 for_each_set_bit(i, dev->absbit, ABS_CNT)
1984 events += input_is_mt_axis(i) ? mt_slots : 1;
1985
1986 if (test_bit(EV_REL, dev->evbit))
1987 events += bitmap_weight(dev->relbit, REL_CNT);
1988
1989 /* Make room for KEY and MSC events */
1990 events += 7;
1991
1992 return events;
1993}
1994
1995#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1996 do { \
1997 if (!test_bit(EV_##type, dev->evbit)) \
1998 memset(dev->bits##bit, 0, \
1999 sizeof(dev->bits##bit)); \
2000 } while (0)
2001
2002static void input_cleanse_bitmasks(struct input_dev *dev)
2003{
2004 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2005 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2006 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2007 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2008 INPUT_CLEANSE_BITMASK(dev, LED, led);
2009 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2010 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2011 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2012}
2013
2014static void __input_unregister_device(struct input_dev *dev)
2015{
2016 struct input_handle *handle, *next;
2017
2018 input_disconnect_device(dev);
2019
2020 mutex_lock(&input_mutex);
2021
2022 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2023 handle->handler->disconnect(handle);
2024 WARN_ON(!list_empty(&dev->h_list));
2025
2026 del_timer_sync(&dev->timer);
2027 list_del_init(&dev->node);
2028
2029 input_wakeup_procfs_readers();
2030
2031 mutex_unlock(&input_mutex);
2032
2033 device_del(&dev->dev);
2034}
2035
2036static void devm_input_device_unregister(struct device *dev, void *res)
2037{
2038 struct input_devres *devres = res;
2039 struct input_dev *input = devres->input;
2040
2041 dev_dbg(dev, "%s: unregistering device %s\n",
2042 __func__, dev_name(&input->dev));
2043 __input_unregister_device(input);
2044}
2045
2046/**
2047 * input_enable_softrepeat - enable software autorepeat
2048 * @dev: input device
2049 * @delay: repeat delay
2050 * @period: repeat period
2051 *
2052 * Enable software autorepeat on the input device.
2053 */
2054void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
2055{
2056 dev->timer.data = (unsigned long) dev;
2057 dev->timer.function = input_repeat_key;
2058 dev->rep[REP_DELAY] = delay;
2059 dev->rep[REP_PERIOD] = period;
2060}
2061EXPORT_SYMBOL(input_enable_softrepeat);
2062
2063/**
2064 * input_register_device - register device with input core
2065 * @dev: device to be registered
2066 *
2067 * This function registers device with input core. The device must be
2068 * allocated with input_allocate_device() and all it's capabilities
2069 * set up before registering.
2070 * If function fails the device must be freed with input_free_device().
2071 * Once device has been successfully registered it can be unregistered
2072 * with input_unregister_device(); input_free_device() should not be
2073 * called in this case.
2074 *
2075 * Note that this function is also used to register managed input devices
2076 * (ones allocated with devm_input_allocate_device()). Such managed input
2077 * devices need not be explicitly unregistered or freed, their tear down
2078 * is controlled by the devres infrastructure. It is also worth noting
2079 * that tear down of managed input devices is internally a 2-step process:
2080 * registered managed input device is first unregistered, but stays in
2081 * memory and can still handle input_event() calls (although events will
2082 * not be delivered anywhere). The freeing of managed input device will
2083 * happen later, when devres stack is unwound to the point where device
2084 * allocation was made.
2085 */
2086int input_register_device(struct input_dev *dev)
2087{
2088 struct input_devres *devres = NULL;
2089 struct input_handler *handler;
2090 unsigned int packet_size;
2091 const char *path;
2092 int error;
2093
2094 if (dev->devres_managed) {
2095 devres = devres_alloc(devm_input_device_unregister,
2096 sizeof(struct input_devres), GFP_KERNEL);
2097 if (!devres)
2098 return -ENOMEM;
2099
2100 devres->input = dev;
2101 }
2102
2103 /* Every input device generates EV_SYN/SYN_REPORT events. */
2104 __set_bit(EV_SYN, dev->evbit);
2105
2106 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2107 __clear_bit(KEY_RESERVED, dev->keybit);
2108
2109 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2110 input_cleanse_bitmasks(dev);
2111
2112 packet_size = input_estimate_events_per_packet(dev);
2113 if (dev->hint_events_per_packet < packet_size)
2114 dev->hint_events_per_packet = packet_size;
2115
2116 dev->max_vals = dev->hint_events_per_packet + 2;
2117 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2118 if (!dev->vals) {
2119 error = -ENOMEM;
2120 goto err_devres_free;
2121 }
2122
2123 /*
2124 * If delay and period are pre-set by the driver, then autorepeating
2125 * is handled by the driver itself and we don't do it in input.c.
2126 */
2127 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
2128 input_enable_softrepeat(dev, 250, 33);
2129
2130 if (!dev->getkeycode)
2131 dev->getkeycode = input_default_getkeycode;
2132
2133 if (!dev->setkeycode)
2134 dev->setkeycode = input_default_setkeycode;
2135
2136 error = device_add(&dev->dev);
2137 if (error)
2138 goto err_free_vals;
2139
2140 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2141 pr_info("%s as %s\n",
2142 dev->name ? dev->name : "Unspecified device",
2143 path ? path : "N/A");
2144 kfree(path);
2145
2146 error = mutex_lock_interruptible(&input_mutex);
2147 if (error)
2148 goto err_device_del;
2149
2150 list_add_tail(&dev->node, &input_dev_list);
2151
2152 list_for_each_entry(handler, &input_handler_list, node)
2153 input_attach_handler(dev, handler);
2154
2155 input_wakeup_procfs_readers();
2156
2157 mutex_unlock(&input_mutex);
2158
2159 if (dev->devres_managed) {
2160 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2161 __func__, dev_name(&dev->dev));
2162 devres_add(dev->dev.parent, devres);
2163 }
2164 return 0;
2165
2166err_device_del:
2167 device_del(&dev->dev);
2168err_free_vals:
2169 kfree(dev->vals);
2170 dev->vals = NULL;
2171err_devres_free:
2172 devres_free(devres);
2173 return error;
2174}
2175EXPORT_SYMBOL(input_register_device);
2176
2177/**
2178 * input_unregister_device - unregister previously registered device
2179 * @dev: device to be unregistered
2180 *
2181 * This function unregisters an input device. Once device is unregistered
2182 * the caller should not try to access it as it may get freed at any moment.
2183 */
2184void input_unregister_device(struct input_dev *dev)
2185{
2186 if (dev->devres_managed) {
2187 WARN_ON(devres_destroy(dev->dev.parent,
2188 devm_input_device_unregister,
2189 devm_input_device_match,
2190 dev));
2191 __input_unregister_device(dev);
2192 /*
2193 * We do not do input_put_device() here because it will be done
2194 * when 2nd devres fires up.
2195 */
2196 } else {
2197 __input_unregister_device(dev);
2198 input_put_device(dev);
2199 }
2200}
2201EXPORT_SYMBOL(input_unregister_device);
2202
2203/**
2204 * input_register_handler - register a new input handler
2205 * @handler: handler to be registered
2206 *
2207 * This function registers a new input handler (interface) for input
2208 * devices in the system and attaches it to all input devices that
2209 * are compatible with the handler.
2210 */
2211int input_register_handler(struct input_handler *handler)
2212{
2213 struct input_dev *dev;
2214 int error;
2215
2216 error = mutex_lock_interruptible(&input_mutex);
2217 if (error)
2218 return error;
2219
2220 INIT_LIST_HEAD(&handler->h_list);
2221
2222 list_add_tail(&handler->node, &input_handler_list);
2223
2224 list_for_each_entry(dev, &input_dev_list, node)
2225 input_attach_handler(dev, handler);
2226
2227 input_wakeup_procfs_readers();
2228
2229 mutex_unlock(&input_mutex);
2230 return 0;
2231}
2232EXPORT_SYMBOL(input_register_handler);
2233
2234/**
2235 * input_unregister_handler - unregisters an input handler
2236 * @handler: handler to be unregistered
2237 *
2238 * This function disconnects a handler from its input devices and
2239 * removes it from lists of known handlers.
2240 */
2241void input_unregister_handler(struct input_handler *handler)
2242{
2243 struct input_handle *handle, *next;
2244
2245 mutex_lock(&input_mutex);
2246
2247 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2248 handler->disconnect(handle);
2249 WARN_ON(!list_empty(&handler->h_list));
2250
2251 list_del_init(&handler->node);
2252
2253 input_wakeup_procfs_readers();
2254
2255 mutex_unlock(&input_mutex);
2256}
2257EXPORT_SYMBOL(input_unregister_handler);
2258
2259/**
2260 * input_handler_for_each_handle - handle iterator
2261 * @handler: input handler to iterate
2262 * @data: data for the callback
2263 * @fn: function to be called for each handle
2264 *
2265 * Iterate over @bus's list of devices, and call @fn for each, passing
2266 * it @data and stop when @fn returns a non-zero value. The function is
2267 * using RCU to traverse the list and therefore may be using in atomic
2268 * contexts. The @fn callback is invoked from RCU critical section and
2269 * thus must not sleep.
2270 */
2271int input_handler_for_each_handle(struct input_handler *handler, void *data,
2272 int (*fn)(struct input_handle *, void *))
2273{
2274 struct input_handle *handle;
2275 int retval = 0;
2276
2277 rcu_read_lock();
2278
2279 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2280 retval = fn(handle, data);
2281 if (retval)
2282 break;
2283 }
2284
2285 rcu_read_unlock();
2286
2287 return retval;
2288}
2289EXPORT_SYMBOL(input_handler_for_each_handle);
2290
2291/**
2292 * input_register_handle - register a new input handle
2293 * @handle: handle to register
2294 *
2295 * This function puts a new input handle onto device's
2296 * and handler's lists so that events can flow through
2297 * it once it is opened using input_open_device().
2298 *
2299 * This function is supposed to be called from handler's
2300 * connect() method.
2301 */
2302int input_register_handle(struct input_handle *handle)
2303{
2304 struct input_handler *handler = handle->handler;
2305 struct input_dev *dev = handle->dev;
2306 int error;
2307
2308 /*
2309 * We take dev->mutex here to prevent race with
2310 * input_release_device().
2311 */
2312 error = mutex_lock_interruptible(&dev->mutex);
2313 if (error)
2314 return error;
2315
2316 /*
2317 * Filters go to the head of the list, normal handlers
2318 * to the tail.
2319 */
2320 if (handler->filter)
2321 list_add_rcu(&handle->d_node, &dev->h_list);
2322 else
2323 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2324
2325 mutex_unlock(&dev->mutex);
2326
2327 /*
2328 * Since we are supposed to be called from ->connect()
2329 * which is mutually exclusive with ->disconnect()
2330 * we can't be racing with input_unregister_handle()
2331 * and so separate lock is not needed here.
2332 */
2333 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2334
2335 if (handler->start)
2336 handler->start(handle);
2337
2338 return 0;
2339}
2340EXPORT_SYMBOL(input_register_handle);
2341
2342/**
2343 * input_unregister_handle - unregister an input handle
2344 * @handle: handle to unregister
2345 *
2346 * This function removes input handle from device's
2347 * and handler's lists.
2348 *
2349 * This function is supposed to be called from handler's
2350 * disconnect() method.
2351 */
2352void input_unregister_handle(struct input_handle *handle)
2353{
2354 struct input_dev *dev = handle->dev;
2355
2356 list_del_rcu(&handle->h_node);
2357
2358 /*
2359 * Take dev->mutex to prevent race with input_release_device().
2360 */
2361 mutex_lock(&dev->mutex);
2362 list_del_rcu(&handle->d_node);
2363 mutex_unlock(&dev->mutex);
2364
2365 synchronize_rcu();
2366}
2367EXPORT_SYMBOL(input_unregister_handle);
2368
2369/**
2370 * input_get_new_minor - allocates a new input minor number
2371 * @legacy_base: beginning or the legacy range to be searched
2372 * @legacy_num: size of legacy range
2373 * @allow_dynamic: whether we can also take ID from the dynamic range
2374 *
2375 * This function allocates a new device minor for from input major namespace.
2376 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2377 * parameters and whether ID can be allocated from dynamic range if there are
2378 * no free IDs in legacy range.
2379 */
2380int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2381 bool allow_dynamic)
2382{
2383 /*
2384 * This function should be called from input handler's ->connect()
2385 * methods, which are serialized with input_mutex, so no additional
2386 * locking is needed here.
2387 */
2388 if (legacy_base >= 0) {
2389 int minor = ida_simple_get(&input_ida,
2390 legacy_base,
2391 legacy_base + legacy_num,
2392 GFP_KERNEL);
2393 if (minor >= 0 || !allow_dynamic)
2394 return minor;
2395 }
2396
2397 return ida_simple_get(&input_ida,
2398 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2399 GFP_KERNEL);
2400}
2401EXPORT_SYMBOL(input_get_new_minor);
2402
2403/**
2404 * input_free_minor - release previously allocated minor
2405 * @minor: minor to be released
2406 *
2407 * This function releases previously allocated input minor so that it can be
2408 * reused later.
2409 */
2410void input_free_minor(unsigned int minor)
2411{
2412 ida_simple_remove(&input_ida, minor);
2413}
2414EXPORT_SYMBOL(input_free_minor);
2415
2416static int __init input_init(void)
2417{
2418 int err;
2419
2420 err = class_register(&input_class);
2421 if (err) {
2422 pr_err("unable to register input_dev class\n");
2423 return err;
2424 }
2425
2426 err = input_proc_init();
2427 if (err)
2428 goto fail1;
2429
2430 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2431 INPUT_MAX_CHAR_DEVICES, "input");
2432 if (err) {
2433 pr_err("unable to register char major %d", INPUT_MAJOR);
2434 goto fail2;
2435 }
2436
2437 return 0;
2438
2439 fail2: input_proc_exit();
2440 fail1: class_unregister(&input_class);
2441 return err;
2442}
2443
2444static void __exit input_exit(void)
2445{
2446 input_proc_exit();
2447 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2448 INPUT_MAX_CHAR_DEVICES);
2449 class_unregister(&input_class);
2450}
2451
2452subsys_initcall(input_init);
2453module_exit(input_exit);