projects/linux·blob v2.6.30 · refs

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1/*
2 * The input core
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13#include <linux/init.h>
14#include <linux/input.h>
15#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/major.h>
18#include <linux/proc_fs.h>
19#include <linux/seq_file.h>
20#include <linux/poll.h>
21#include <linux/device.h>
22#include <linux/mutex.h>
23#include <linux/rcupdate.h>
24#include <linux/smp_lock.h>
25
26MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
27MODULE_DESCRIPTION("Input core");
28MODULE_LICENSE("GPL");
29
30#define INPUT_DEVICES 256
31
32/*
33 * EV_ABS events which should not be cached are listed here.
34 */
35static unsigned int input_abs_bypass_init_data[] __initdata = {
36 ABS_MT_TOUCH_MAJOR,
37 ABS_MT_TOUCH_MINOR,
38 ABS_MT_WIDTH_MAJOR,
39 ABS_MT_WIDTH_MINOR,
40 ABS_MT_ORIENTATION,
41 ABS_MT_POSITION_X,
42 ABS_MT_POSITION_Y,
43 ABS_MT_TOOL_TYPE,
44 ABS_MT_BLOB_ID,
45 ABS_MT_TRACKING_ID,
46 0
47};
48static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
49
50static LIST_HEAD(input_dev_list);
51static LIST_HEAD(input_handler_list);
52
53/*
54 * input_mutex protects access to both input_dev_list and input_handler_list.
55 * This also causes input_[un]register_device and input_[un]register_handler
56 * be mutually exclusive which simplifies locking in drivers implementing
57 * input handlers.
58 */
59static DEFINE_MUTEX(input_mutex);
60
61static struct input_handler *input_table[8];
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
85/*
86 * Pass event through all open handles. This function is called with
87 * dev->event_lock held and interrupts disabled.
88 */
89static void input_pass_event(struct input_dev *dev,
90 unsigned int type, unsigned int code, int value)
91{
92 struct input_handle *handle;
93
94 rcu_read_lock();
95
96 handle = rcu_dereference(dev->grab);
97 if (handle)
98 handle->handler->event(handle, type, code, value);
99 else
100 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
101 if (handle->open)
102 handle->handler->event(handle,
103 type, code, value);
104 rcu_read_unlock();
105}
106
107/*
108 * Generate software autorepeat event. Note that we take
109 * dev->event_lock here to avoid racing with input_event
110 * which may cause keys get "stuck".
111 */
112static void input_repeat_key(unsigned long data)
113{
114 struct input_dev *dev = (void *) data;
115 unsigned long flags;
116
117 spin_lock_irqsave(&dev->event_lock, flags);
118
119 if (test_bit(dev->repeat_key, dev->key) &&
120 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
121
122 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
123
124 if (dev->sync) {
125 /*
126 * Only send SYN_REPORT if we are not in a middle
127 * of driver parsing a new hardware packet.
128 * Otherwise assume that the driver will send
129 * SYN_REPORT once it's done.
130 */
131 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
132 }
133
134 if (dev->rep[REP_PERIOD])
135 mod_timer(&dev->timer, jiffies +
136 msecs_to_jiffies(dev->rep[REP_PERIOD]));
137 }
138
139 spin_unlock_irqrestore(&dev->event_lock, flags);
140}
141
142static void input_start_autorepeat(struct input_dev *dev, int code)
143{
144 if (test_bit(EV_REP, dev->evbit) &&
145 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
146 dev->timer.data) {
147 dev->repeat_key = code;
148 mod_timer(&dev->timer,
149 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
150 }
151}
152
153static void input_stop_autorepeat(struct input_dev *dev)
154{
155 del_timer(&dev->timer);
156}
157
158#define INPUT_IGNORE_EVENT 0
159#define INPUT_PASS_TO_HANDLERS 1
160#define INPUT_PASS_TO_DEVICE 2
161#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
162
163static void input_handle_event(struct input_dev *dev,
164 unsigned int type, unsigned int code, int value)
165{
166 int disposition = INPUT_IGNORE_EVENT;
167
168 switch (type) {
169
170 case EV_SYN:
171 switch (code) {
172 case SYN_CONFIG:
173 disposition = INPUT_PASS_TO_ALL;
174 break;
175
176 case SYN_REPORT:
177 if (!dev->sync) {
178 dev->sync = 1;
179 disposition = INPUT_PASS_TO_HANDLERS;
180 }
181 break;
182 case SYN_MT_REPORT:
183 dev->sync = 0;
184 disposition = INPUT_PASS_TO_HANDLERS;
185 break;
186 }
187 break;
188
189 case EV_KEY:
190 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
191 !!test_bit(code, dev->key) != value) {
192
193 if (value != 2) {
194 __change_bit(code, dev->key);
195 if (value)
196 input_start_autorepeat(dev, code);
197 else
198 input_stop_autorepeat(dev);
199 }
200
201 disposition = INPUT_PASS_TO_HANDLERS;
202 }
203 break;
204
205 case EV_SW:
206 if (is_event_supported(code, dev->swbit, SW_MAX) &&
207 !!test_bit(code, dev->sw) != value) {
208
209 __change_bit(code, dev->sw);
210 disposition = INPUT_PASS_TO_HANDLERS;
211 }
212 break;
213
214 case EV_ABS:
215 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
216
217 if (test_bit(code, input_abs_bypass)) {
218 disposition = INPUT_PASS_TO_HANDLERS;
219 break;
220 }
221
222 value = input_defuzz_abs_event(value,
223 dev->abs[code], dev->absfuzz[code]);
224
225 if (dev->abs[code] != value) {
226 dev->abs[code] = value;
227 disposition = INPUT_PASS_TO_HANDLERS;
228 }
229 }
230 break;
231
232 case EV_REL:
233 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
234 disposition = INPUT_PASS_TO_HANDLERS;
235
236 break;
237
238 case EV_MSC:
239 if (is_event_supported(code, dev->mscbit, MSC_MAX))
240 disposition = INPUT_PASS_TO_ALL;
241
242 break;
243
244 case EV_LED:
245 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
246 !!test_bit(code, dev->led) != value) {
247
248 __change_bit(code, dev->led);
249 disposition = INPUT_PASS_TO_ALL;
250 }
251 break;
252
253 case EV_SND:
254 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
255
256 if (!!test_bit(code, dev->snd) != !!value)
257 __change_bit(code, dev->snd);
258 disposition = INPUT_PASS_TO_ALL;
259 }
260 break;
261
262 case EV_REP:
263 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
264 dev->rep[code] = value;
265 disposition = INPUT_PASS_TO_ALL;
266 }
267 break;
268
269 case EV_FF:
270 if (value >= 0)
271 disposition = INPUT_PASS_TO_ALL;
272 break;
273
274 case EV_PWR:
275 disposition = INPUT_PASS_TO_ALL;
276 break;
277 }
278
279 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
280 dev->sync = 0;
281
282 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
283 dev->event(dev, type, code, value);
284
285 if (disposition & INPUT_PASS_TO_HANDLERS)
286 input_pass_event(dev, type, code, value);
287}
288
289/**
290 * input_event() - report new input event
291 * @dev: device that generated the event
292 * @type: type of the event
293 * @code: event code
294 * @value: value of the event
295 *
296 * This function should be used by drivers implementing various input
297 * devices. See also input_inject_event().
298 */
299
300void input_event(struct input_dev *dev,
301 unsigned int type, unsigned int code, int value)
302{
303 unsigned long flags;
304
305 if (is_event_supported(type, dev->evbit, EV_MAX)) {
306
307 spin_lock_irqsave(&dev->event_lock, flags);
308 add_input_randomness(type, code, value);
309 input_handle_event(dev, type, code, value);
310 spin_unlock_irqrestore(&dev->event_lock, flags);
311 }
312}
313EXPORT_SYMBOL(input_event);
314
315/**
316 * input_inject_event() - send input event from input handler
317 * @handle: input handle to send event through
318 * @type: type of the event
319 * @code: event code
320 * @value: value of the event
321 *
322 * Similar to input_event() but will ignore event if device is
323 * "grabbed" and handle injecting event is not the one that owns
324 * the device.
325 */
326void input_inject_event(struct input_handle *handle,
327 unsigned int type, unsigned int code, int value)
328{
329 struct input_dev *dev = handle->dev;
330 struct input_handle *grab;
331 unsigned long flags;
332
333 if (is_event_supported(type, dev->evbit, EV_MAX)) {
334 spin_lock_irqsave(&dev->event_lock, flags);
335
336 rcu_read_lock();
337 grab = rcu_dereference(dev->grab);
338 if (!grab || grab == handle)
339 input_handle_event(dev, type, code, value);
340 rcu_read_unlock();
341
342 spin_unlock_irqrestore(&dev->event_lock, flags);
343 }
344}
345EXPORT_SYMBOL(input_inject_event);
346
347/**
348 * input_grab_device - grabs device for exclusive use
349 * @handle: input handle that wants to own the device
350 *
351 * When a device is grabbed by an input handle all events generated by
352 * the device are delivered only to this handle. Also events injected
353 * by other input handles are ignored while device is grabbed.
354 */
355int input_grab_device(struct input_handle *handle)
356{
357 struct input_dev *dev = handle->dev;
358 int retval;
359
360 retval = mutex_lock_interruptible(&dev->mutex);
361 if (retval)
362 return retval;
363
364 if (dev->grab) {
365 retval = -EBUSY;
366 goto out;
367 }
368
369 rcu_assign_pointer(dev->grab, handle);
370 synchronize_rcu();
371
372 out:
373 mutex_unlock(&dev->mutex);
374 return retval;
375}
376EXPORT_SYMBOL(input_grab_device);
377
378static void __input_release_device(struct input_handle *handle)
379{
380 struct input_dev *dev = handle->dev;
381
382 if (dev->grab == handle) {
383 rcu_assign_pointer(dev->grab, NULL);
384 /* Make sure input_pass_event() notices that grab is gone */
385 synchronize_rcu();
386
387 list_for_each_entry(handle, &dev->h_list, d_node)
388 if (handle->open && handle->handler->start)
389 handle->handler->start(handle);
390 }
391}
392
393/**
394 * input_release_device - release previously grabbed device
395 * @handle: input handle that owns the device
396 *
397 * Releases previously grabbed device so that other input handles can
398 * start receiving input events. Upon release all handlers attached
399 * to the device have their start() method called so they have a change
400 * to synchronize device state with the rest of the system.
401 */
402void input_release_device(struct input_handle *handle)
403{
404 struct input_dev *dev = handle->dev;
405
406 mutex_lock(&dev->mutex);
407 __input_release_device(handle);
408 mutex_unlock(&dev->mutex);
409}
410EXPORT_SYMBOL(input_release_device);
411
412/**
413 * input_open_device - open input device
414 * @handle: handle through which device is being accessed
415 *
416 * This function should be called by input handlers when they
417 * want to start receive events from given input device.
418 */
419int input_open_device(struct input_handle *handle)
420{
421 struct input_dev *dev = handle->dev;
422 int retval;
423
424 retval = mutex_lock_interruptible(&dev->mutex);
425 if (retval)
426 return retval;
427
428 if (dev->going_away) {
429 retval = -ENODEV;
430 goto out;
431 }
432
433 handle->open++;
434
435 if (!dev->users++ && dev->open)
436 retval = dev->open(dev);
437
438 if (retval) {
439 dev->users--;
440 if (!--handle->open) {
441 /*
442 * Make sure we are not delivering any more events
443 * through this handle
444 */
445 synchronize_rcu();
446 }
447 }
448
449 out:
450 mutex_unlock(&dev->mutex);
451 return retval;
452}
453EXPORT_SYMBOL(input_open_device);
454
455int input_flush_device(struct input_handle *handle, struct file *file)
456{
457 struct input_dev *dev = handle->dev;
458 int retval;
459
460 retval = mutex_lock_interruptible(&dev->mutex);
461 if (retval)
462 return retval;
463
464 if (dev->flush)
465 retval = dev->flush(dev, file);
466
467 mutex_unlock(&dev->mutex);
468 return retval;
469}
470EXPORT_SYMBOL(input_flush_device);
471
472/**
473 * input_close_device - close input device
474 * @handle: handle through which device is being accessed
475 *
476 * This function should be called by input handlers when they
477 * want to stop receive events from given input device.
478 */
479void input_close_device(struct input_handle *handle)
480{
481 struct input_dev *dev = handle->dev;
482
483 mutex_lock(&dev->mutex);
484
485 __input_release_device(handle);
486
487 if (!--dev->users && dev->close)
488 dev->close(dev);
489
490 if (!--handle->open) {
491 /*
492 * synchronize_rcu() makes sure that input_pass_event()
493 * completed and that no more input events are delivered
494 * through this handle
495 */
496 synchronize_rcu();
497 }
498
499 mutex_unlock(&dev->mutex);
500}
501EXPORT_SYMBOL(input_close_device);
502
503/*
504 * Prepare device for unregistering
505 */
506static void input_disconnect_device(struct input_dev *dev)
507{
508 struct input_handle *handle;
509 int code;
510
511 /*
512 * Mark device as going away. Note that we take dev->mutex here
513 * not to protect access to dev->going_away but rather to ensure
514 * that there are no threads in the middle of input_open_device()
515 */
516 mutex_lock(&dev->mutex);
517 dev->going_away = 1;
518 mutex_unlock(&dev->mutex);
519
520 spin_lock_irq(&dev->event_lock);
521
522 /*
523 * Simulate keyup events for all pressed keys so that handlers
524 * are not left with "stuck" keys. The driver may continue
525 * generate events even after we done here but they will not
526 * reach any handlers.
527 */
528 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
529 for (code = 0; code <= KEY_MAX; code++) {
530 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
531 __test_and_clear_bit(code, dev->key)) {
532 input_pass_event(dev, EV_KEY, code, 0);
533 }
534 }
535 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
536 }
537
538 list_for_each_entry(handle, &dev->h_list, d_node)
539 handle->open = 0;
540
541 spin_unlock_irq(&dev->event_lock);
542}
543
544static int input_fetch_keycode(struct input_dev *dev, int scancode)
545{
546 switch (dev->keycodesize) {
547 case 1:
548 return ((u8 *)dev->keycode)[scancode];
549
550 case 2:
551 return ((u16 *)dev->keycode)[scancode];
552
553 default:
554 return ((u32 *)dev->keycode)[scancode];
555 }
556}
557
558static int input_default_getkeycode(struct input_dev *dev,
559 int scancode, int *keycode)
560{
561 if (!dev->keycodesize)
562 return -EINVAL;
563
564 if (scancode >= dev->keycodemax)
565 return -EINVAL;
566
567 *keycode = input_fetch_keycode(dev, scancode);
568
569 return 0;
570}
571
572static int input_default_setkeycode(struct input_dev *dev,
573 int scancode, int keycode)
574{
575 int old_keycode;
576 int i;
577
578 if (scancode >= dev->keycodemax)
579 return -EINVAL;
580
581 if (!dev->keycodesize)
582 return -EINVAL;
583
584 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
585 return -EINVAL;
586
587 switch (dev->keycodesize) {
588 case 1: {
589 u8 *k = (u8 *)dev->keycode;
590 old_keycode = k[scancode];
591 k[scancode] = keycode;
592 break;
593 }
594 case 2: {
595 u16 *k = (u16 *)dev->keycode;
596 old_keycode = k[scancode];
597 k[scancode] = keycode;
598 break;
599 }
600 default: {
601 u32 *k = (u32 *)dev->keycode;
602 old_keycode = k[scancode];
603 k[scancode] = keycode;
604 break;
605 }
606 }
607
608 clear_bit(old_keycode, dev->keybit);
609 set_bit(keycode, dev->keybit);
610
611 for (i = 0; i < dev->keycodemax; i++) {
612 if (input_fetch_keycode(dev, i) == old_keycode) {
613 set_bit(old_keycode, dev->keybit);
614 break; /* Setting the bit twice is useless, so break */
615 }
616 }
617
618 return 0;
619}
620
621/**
622 * input_get_keycode - retrieve keycode currently mapped to a given scancode
623 * @dev: input device which keymap is being queried
624 * @scancode: scancode (or its equivalent for device in question) for which
625 * keycode is needed
626 * @keycode: result
627 *
628 * This function should be called by anyone interested in retrieving current
629 * keymap. Presently keyboard and evdev handlers use it.
630 */
631int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
632{
633 if (scancode < 0)
634 return -EINVAL;
635
636 return dev->getkeycode(dev, scancode, keycode);
637}
638EXPORT_SYMBOL(input_get_keycode);
639
640/**
641 * input_get_keycode - assign new keycode to a given scancode
642 * @dev: input device which keymap is being updated
643 * @scancode: scancode (or its equivalent for device in question)
644 * @keycode: new keycode to be assigned to the scancode
645 *
646 * This function should be called by anyone needing to update current
647 * keymap. Presently keyboard and evdev handlers use it.
648 */
649int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
650{
651 unsigned long flags;
652 int old_keycode;
653 int retval;
654
655 if (scancode < 0)
656 return -EINVAL;
657
658 if (keycode < 0 || keycode > KEY_MAX)
659 return -EINVAL;
660
661 spin_lock_irqsave(&dev->event_lock, flags);
662
663 retval = dev->getkeycode(dev, scancode, &old_keycode);
664 if (retval)
665 goto out;
666
667 retval = dev->setkeycode(dev, scancode, keycode);
668 if (retval)
669 goto out;
670
671 /*
672 * Simulate keyup event if keycode is not present
673 * in the keymap anymore
674 */
675 if (test_bit(EV_KEY, dev->evbit) &&
676 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
677 __test_and_clear_bit(old_keycode, dev->key)) {
678
679 input_pass_event(dev, EV_KEY, old_keycode, 0);
680 if (dev->sync)
681 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
682 }
683
684 out:
685 spin_unlock_irqrestore(&dev->event_lock, flags);
686
687 return retval;
688}
689EXPORT_SYMBOL(input_set_keycode);
690
691#define MATCH_BIT(bit, max) \
692 for (i = 0; i < BITS_TO_LONGS(max); i++) \
693 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
694 break; \
695 if (i != BITS_TO_LONGS(max)) \
696 continue;
697
698static const struct input_device_id *input_match_device(const struct input_device_id *id,
699 struct input_dev *dev)
700{
701 int i;
702
703 for (; id->flags || id->driver_info; id++) {
704
705 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
706 if (id->bustype != dev->id.bustype)
707 continue;
708
709 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
710 if (id->vendor != dev->id.vendor)
711 continue;
712
713 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
714 if (id->product != dev->id.product)
715 continue;
716
717 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
718 if (id->version != dev->id.version)
719 continue;
720
721 MATCH_BIT(evbit, EV_MAX);
722 MATCH_BIT(keybit, KEY_MAX);
723 MATCH_BIT(relbit, REL_MAX);
724 MATCH_BIT(absbit, ABS_MAX);
725 MATCH_BIT(mscbit, MSC_MAX);
726 MATCH_BIT(ledbit, LED_MAX);
727 MATCH_BIT(sndbit, SND_MAX);
728 MATCH_BIT(ffbit, FF_MAX);
729 MATCH_BIT(swbit, SW_MAX);
730
731 return id;
732 }
733
734 return NULL;
735}
736
737static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
738{
739 const struct input_device_id *id;
740 int error;
741
742 if (handler->blacklist && input_match_device(handler->blacklist, dev))
743 return -ENODEV;
744
745 id = input_match_device(handler->id_table, dev);
746 if (!id)
747 return -ENODEV;
748
749 error = handler->connect(handler, dev, id);
750 if (error && error != -ENODEV)
751 printk(KERN_ERR
752 "input: failed to attach handler %s to device %s, "
753 "error: %d\n",
754 handler->name, kobject_name(&dev->dev.kobj), error);
755
756 return error;
757}
758
759
760#ifdef CONFIG_PROC_FS
761
762static struct proc_dir_entry *proc_bus_input_dir;
763static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
764static int input_devices_state;
765
766static inline void input_wakeup_procfs_readers(void)
767{
768 input_devices_state++;
769 wake_up(&input_devices_poll_wait);
770}
771
772static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
773{
774 poll_wait(file, &input_devices_poll_wait, wait);
775 if (file->f_version != input_devices_state) {
776 file->f_version = input_devices_state;
777 return POLLIN | POLLRDNORM;
778 }
779
780 return 0;
781}
782
783static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
784{
785 if (mutex_lock_interruptible(&input_mutex))
786 return NULL;
787
788 return seq_list_start(&input_dev_list, *pos);
789}
790
791static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
792{
793 return seq_list_next(v, &input_dev_list, pos);
794}
795
796static void input_devices_seq_stop(struct seq_file *seq, void *v)
797{
798 mutex_unlock(&input_mutex);
799}
800
801static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
802 unsigned long *bitmap, int max)
803{
804 int i;
805
806 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
807 if (bitmap[i])
808 break;
809
810 seq_printf(seq, "B: %s=", name);
811 for (; i >= 0; i--)
812 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
813 seq_putc(seq, '\n');
814}
815
816static int input_devices_seq_show(struct seq_file *seq, void *v)
817{
818 struct input_dev *dev = container_of(v, struct input_dev, node);
819 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
820 struct input_handle *handle;
821
822 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
823 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
824
825 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
826 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
827 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
828 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
829 seq_printf(seq, "H: Handlers=");
830
831 list_for_each_entry(handle, &dev->h_list, d_node)
832 seq_printf(seq, "%s ", handle->name);
833 seq_putc(seq, '\n');
834
835 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
836 if (test_bit(EV_KEY, dev->evbit))
837 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
838 if (test_bit(EV_REL, dev->evbit))
839 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
840 if (test_bit(EV_ABS, dev->evbit))
841 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
842 if (test_bit(EV_MSC, dev->evbit))
843 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
844 if (test_bit(EV_LED, dev->evbit))
845 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
846 if (test_bit(EV_SND, dev->evbit))
847 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
848 if (test_bit(EV_FF, dev->evbit))
849 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
850 if (test_bit(EV_SW, dev->evbit))
851 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
852
853 seq_putc(seq, '\n');
854
855 kfree(path);
856 return 0;
857}
858
859static const struct seq_operations input_devices_seq_ops = {
860 .start = input_devices_seq_start,
861 .next = input_devices_seq_next,
862 .stop = input_devices_seq_stop,
863 .show = input_devices_seq_show,
864};
865
866static int input_proc_devices_open(struct inode *inode, struct file *file)
867{
868 return seq_open(file, &input_devices_seq_ops);
869}
870
871static const struct file_operations input_devices_fileops = {
872 .owner = THIS_MODULE,
873 .open = input_proc_devices_open,
874 .poll = input_proc_devices_poll,
875 .read = seq_read,
876 .llseek = seq_lseek,
877 .release = seq_release,
878};
879
880static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
881{
882 if (mutex_lock_interruptible(&input_mutex))
883 return NULL;
884
885 seq->private = (void *)(unsigned long)*pos;
886 return seq_list_start(&input_handler_list, *pos);
887}
888
889static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
890{
891 seq->private = (void *)(unsigned long)(*pos + 1);
892 return seq_list_next(v, &input_handler_list, pos);
893}
894
895static void input_handlers_seq_stop(struct seq_file *seq, void *v)
896{
897 mutex_unlock(&input_mutex);
898}
899
900static int input_handlers_seq_show(struct seq_file *seq, void *v)
901{
902 struct input_handler *handler = container_of(v, struct input_handler, node);
903
904 seq_printf(seq, "N: Number=%ld Name=%s",
905 (unsigned long)seq->private, handler->name);
906 if (handler->fops)
907 seq_printf(seq, " Minor=%d", handler->minor);
908 seq_putc(seq, '\n');
909
910 return 0;
911}
912static const struct seq_operations input_handlers_seq_ops = {
913 .start = input_handlers_seq_start,
914 .next = input_handlers_seq_next,
915 .stop = input_handlers_seq_stop,
916 .show = input_handlers_seq_show,
917};
918
919static int input_proc_handlers_open(struct inode *inode, struct file *file)
920{
921 return seq_open(file, &input_handlers_seq_ops);
922}
923
924static const struct file_operations input_handlers_fileops = {
925 .owner = THIS_MODULE,
926 .open = input_proc_handlers_open,
927 .read = seq_read,
928 .llseek = seq_lseek,
929 .release = seq_release,
930};
931
932static int __init input_proc_init(void)
933{
934 struct proc_dir_entry *entry;
935
936 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
937 if (!proc_bus_input_dir)
938 return -ENOMEM;
939
940 entry = proc_create("devices", 0, proc_bus_input_dir,
941 &input_devices_fileops);
942 if (!entry)
943 goto fail1;
944
945 entry = proc_create("handlers", 0, proc_bus_input_dir,
946 &input_handlers_fileops);
947 if (!entry)
948 goto fail2;
949
950 return 0;
951
952 fail2: remove_proc_entry("devices", proc_bus_input_dir);
953 fail1: remove_proc_entry("bus/input", NULL);
954 return -ENOMEM;
955}
956
957static void input_proc_exit(void)
958{
959 remove_proc_entry("devices", proc_bus_input_dir);
960 remove_proc_entry("handlers", proc_bus_input_dir);
961 remove_proc_entry("bus/input", NULL);
962}
963
964#else /* !CONFIG_PROC_FS */
965static inline void input_wakeup_procfs_readers(void) { }
966static inline int input_proc_init(void) { return 0; }
967static inline void input_proc_exit(void) { }
968#endif
969
970#define INPUT_DEV_STRING_ATTR_SHOW(name) \
971static ssize_t input_dev_show_##name(struct device *dev, \
972 struct device_attribute *attr, \
973 char *buf) \
974{ \
975 struct input_dev *input_dev = to_input_dev(dev); \
976 \
977 return scnprintf(buf, PAGE_SIZE, "%s\n", \
978 input_dev->name ? input_dev->name : ""); \
979} \
980static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
981
982INPUT_DEV_STRING_ATTR_SHOW(name);
983INPUT_DEV_STRING_ATTR_SHOW(phys);
984INPUT_DEV_STRING_ATTR_SHOW(uniq);
985
986static int input_print_modalias_bits(char *buf, int size,
987 char name, unsigned long *bm,
988 unsigned int min_bit, unsigned int max_bit)
989{
990 int len = 0, i;
991
992 len += snprintf(buf, max(size, 0), "%c", name);
993 for (i = min_bit; i < max_bit; i++)
994 if (bm[BIT_WORD(i)] & BIT_MASK(i))
995 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
996 return len;
997}
998
999static int input_print_modalias(char *buf, int size, struct input_dev *id,
1000 int add_cr)
1001{
1002 int len;
1003
1004 len = snprintf(buf, max(size, 0),
1005 "input:b%04Xv%04Xp%04Xe%04X-",
1006 id->id.bustype, id->id.vendor,
1007 id->id.product, id->id.version);
1008
1009 len += input_print_modalias_bits(buf + len, size - len,
1010 'e', id->evbit, 0, EV_MAX);
1011 len += input_print_modalias_bits(buf + len, size - len,
1012 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1013 len += input_print_modalias_bits(buf + len, size - len,
1014 'r', id->relbit, 0, REL_MAX);
1015 len += input_print_modalias_bits(buf + len, size - len,
1016 'a', id->absbit, 0, ABS_MAX);
1017 len += input_print_modalias_bits(buf + len, size - len,
1018 'm', id->mscbit, 0, MSC_MAX);
1019 len += input_print_modalias_bits(buf + len, size - len,
1020 'l', id->ledbit, 0, LED_MAX);
1021 len += input_print_modalias_bits(buf + len, size - len,
1022 's', id->sndbit, 0, SND_MAX);
1023 len += input_print_modalias_bits(buf + len, size - len,
1024 'f', id->ffbit, 0, FF_MAX);
1025 len += input_print_modalias_bits(buf + len, size - len,
1026 'w', id->swbit, 0, SW_MAX);
1027
1028 if (add_cr)
1029 len += snprintf(buf + len, max(size - len, 0), "\n");
1030
1031 return len;
1032}
1033
1034static ssize_t input_dev_show_modalias(struct device *dev,
1035 struct device_attribute *attr,
1036 char *buf)
1037{
1038 struct input_dev *id = to_input_dev(dev);
1039 ssize_t len;
1040
1041 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1042
1043 return min_t(int, len, PAGE_SIZE);
1044}
1045static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1046
1047static struct attribute *input_dev_attrs[] = {
1048 &dev_attr_name.attr,
1049 &dev_attr_phys.attr,
1050 &dev_attr_uniq.attr,
1051 &dev_attr_modalias.attr,
1052 NULL
1053};
1054
1055static struct attribute_group input_dev_attr_group = {
1056 .attrs = input_dev_attrs,
1057};
1058
1059#define INPUT_DEV_ID_ATTR(name) \
1060static ssize_t input_dev_show_id_##name(struct device *dev, \
1061 struct device_attribute *attr, \
1062 char *buf) \
1063{ \
1064 struct input_dev *input_dev = to_input_dev(dev); \
1065 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1066} \
1067static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1068
1069INPUT_DEV_ID_ATTR(bustype);
1070INPUT_DEV_ID_ATTR(vendor);
1071INPUT_DEV_ID_ATTR(product);
1072INPUT_DEV_ID_ATTR(version);
1073
1074static struct attribute *input_dev_id_attrs[] = {
1075 &dev_attr_bustype.attr,
1076 &dev_attr_vendor.attr,
1077 &dev_attr_product.attr,
1078 &dev_attr_version.attr,
1079 NULL
1080};
1081
1082static struct attribute_group input_dev_id_attr_group = {
1083 .name = "id",
1084 .attrs = input_dev_id_attrs,
1085};
1086
1087static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1088 int max, int add_cr)
1089{
1090 int i;
1091 int len = 0;
1092
1093 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
1094 if (bitmap[i])
1095 break;
1096
1097 for (; i >= 0; i--)
1098 len += snprintf(buf + len, max(buf_size - len, 0),
1099 "%lx%s", bitmap[i], i > 0 ? " " : "");
1100
1101 if (add_cr)
1102 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1103
1104 return len;
1105}
1106
1107#define INPUT_DEV_CAP_ATTR(ev, bm) \
1108static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1109 struct device_attribute *attr, \
1110 char *buf) \
1111{ \
1112 struct input_dev *input_dev = to_input_dev(dev); \
1113 int len = input_print_bitmap(buf, PAGE_SIZE, \
1114 input_dev->bm##bit, ev##_MAX, 1); \
1115 return min_t(int, len, PAGE_SIZE); \
1116} \
1117static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1118
1119INPUT_DEV_CAP_ATTR(EV, ev);
1120INPUT_DEV_CAP_ATTR(KEY, key);
1121INPUT_DEV_CAP_ATTR(REL, rel);
1122INPUT_DEV_CAP_ATTR(ABS, abs);
1123INPUT_DEV_CAP_ATTR(MSC, msc);
1124INPUT_DEV_CAP_ATTR(LED, led);
1125INPUT_DEV_CAP_ATTR(SND, snd);
1126INPUT_DEV_CAP_ATTR(FF, ff);
1127INPUT_DEV_CAP_ATTR(SW, sw);
1128
1129static struct attribute *input_dev_caps_attrs[] = {
1130 &dev_attr_ev.attr,
1131 &dev_attr_key.attr,
1132 &dev_attr_rel.attr,
1133 &dev_attr_abs.attr,
1134 &dev_attr_msc.attr,
1135 &dev_attr_led.attr,
1136 &dev_attr_snd.attr,
1137 &dev_attr_ff.attr,
1138 &dev_attr_sw.attr,
1139 NULL
1140};
1141
1142static struct attribute_group input_dev_caps_attr_group = {
1143 .name = "capabilities",
1144 .attrs = input_dev_caps_attrs,
1145};
1146
1147static struct attribute_group *input_dev_attr_groups[] = {
1148 &input_dev_attr_group,
1149 &input_dev_id_attr_group,
1150 &input_dev_caps_attr_group,
1151 NULL
1152};
1153
1154static void input_dev_release(struct device *device)
1155{
1156 struct input_dev *dev = to_input_dev(device);
1157
1158 input_ff_destroy(dev);
1159 kfree(dev);
1160
1161 module_put(THIS_MODULE);
1162}
1163
1164/*
1165 * Input uevent interface - loading event handlers based on
1166 * device bitfields.
1167 */
1168static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1169 const char *name, unsigned long *bitmap, int max)
1170{
1171 int len;
1172
1173 if (add_uevent_var(env, "%s=", name))
1174 return -ENOMEM;
1175
1176 len = input_print_bitmap(&env->buf[env->buflen - 1],
1177 sizeof(env->buf) - env->buflen,
1178 bitmap, max, 0);
1179 if (len >= (sizeof(env->buf) - env->buflen))
1180 return -ENOMEM;
1181
1182 env->buflen += len;
1183 return 0;
1184}
1185
1186static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1187 struct input_dev *dev)
1188{
1189 int len;
1190
1191 if (add_uevent_var(env, "MODALIAS="))
1192 return -ENOMEM;
1193
1194 len = input_print_modalias(&env->buf[env->buflen - 1],
1195 sizeof(env->buf) - env->buflen,
1196 dev, 0);
1197 if (len >= (sizeof(env->buf) - env->buflen))
1198 return -ENOMEM;
1199
1200 env->buflen += len;
1201 return 0;
1202}
1203
1204#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1205 do { \
1206 int err = add_uevent_var(env, fmt, val); \
1207 if (err) \
1208 return err; \
1209 } while (0)
1210
1211#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1212 do { \
1213 int err = input_add_uevent_bm_var(env, name, bm, max); \
1214 if (err) \
1215 return err; \
1216 } while (0)
1217
1218#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1219 do { \
1220 int err = input_add_uevent_modalias_var(env, dev); \
1221 if (err) \
1222 return err; \
1223 } while (0)
1224
1225static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1226{
1227 struct input_dev *dev = to_input_dev(device);
1228
1229 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1230 dev->id.bustype, dev->id.vendor,
1231 dev->id.product, dev->id.version);
1232 if (dev->name)
1233 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1234 if (dev->phys)
1235 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1236 if (dev->uniq)
1237 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1238
1239 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1240 if (test_bit(EV_KEY, dev->evbit))
1241 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1242 if (test_bit(EV_REL, dev->evbit))
1243 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1244 if (test_bit(EV_ABS, dev->evbit))
1245 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1246 if (test_bit(EV_MSC, dev->evbit))
1247 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1248 if (test_bit(EV_LED, dev->evbit))
1249 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1250 if (test_bit(EV_SND, dev->evbit))
1251 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1252 if (test_bit(EV_FF, dev->evbit))
1253 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1254 if (test_bit(EV_SW, dev->evbit))
1255 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1256
1257 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1258
1259 return 0;
1260}
1261
1262static struct device_type input_dev_type = {
1263 .groups = input_dev_attr_groups,
1264 .release = input_dev_release,
1265 .uevent = input_dev_uevent,
1266};
1267
1268struct class input_class = {
1269 .name = "input",
1270};
1271EXPORT_SYMBOL_GPL(input_class);
1272
1273/**
1274 * input_allocate_device - allocate memory for new input device
1275 *
1276 * Returns prepared struct input_dev or NULL.
1277 *
1278 * NOTE: Use input_free_device() to free devices that have not been
1279 * registered; input_unregister_device() should be used for already
1280 * registered devices.
1281 */
1282struct input_dev *input_allocate_device(void)
1283{
1284 struct input_dev *dev;
1285
1286 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1287 if (dev) {
1288 dev->dev.type = &input_dev_type;
1289 dev->dev.class = &input_class;
1290 device_initialize(&dev->dev);
1291 mutex_init(&dev->mutex);
1292 spin_lock_init(&dev->event_lock);
1293 INIT_LIST_HEAD(&dev->h_list);
1294 INIT_LIST_HEAD(&dev->node);
1295
1296 __module_get(THIS_MODULE);
1297 }
1298
1299 return dev;
1300}
1301EXPORT_SYMBOL(input_allocate_device);
1302
1303/**
1304 * input_free_device - free memory occupied by input_dev structure
1305 * @dev: input device to free
1306 *
1307 * This function should only be used if input_register_device()
1308 * was not called yet or if it failed. Once device was registered
1309 * use input_unregister_device() and memory will be freed once last
1310 * reference to the device is dropped.
1311 *
1312 * Device should be allocated by input_allocate_device().
1313 *
1314 * NOTE: If there are references to the input device then memory
1315 * will not be freed until last reference is dropped.
1316 */
1317void input_free_device(struct input_dev *dev)
1318{
1319 if (dev)
1320 input_put_device(dev);
1321}
1322EXPORT_SYMBOL(input_free_device);
1323
1324/**
1325 * input_set_capability - mark device as capable of a certain event
1326 * @dev: device that is capable of emitting or accepting event
1327 * @type: type of the event (EV_KEY, EV_REL, etc...)
1328 * @code: event code
1329 *
1330 * In addition to setting up corresponding bit in appropriate capability
1331 * bitmap the function also adjusts dev->evbit.
1332 */
1333void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1334{
1335 switch (type) {
1336 case EV_KEY:
1337 __set_bit(code, dev->keybit);
1338 break;
1339
1340 case EV_REL:
1341 __set_bit(code, dev->relbit);
1342 break;
1343
1344 case EV_ABS:
1345 __set_bit(code, dev->absbit);
1346 break;
1347
1348 case EV_MSC:
1349 __set_bit(code, dev->mscbit);
1350 break;
1351
1352 case EV_SW:
1353 __set_bit(code, dev->swbit);
1354 break;
1355
1356 case EV_LED:
1357 __set_bit(code, dev->ledbit);
1358 break;
1359
1360 case EV_SND:
1361 __set_bit(code, dev->sndbit);
1362 break;
1363
1364 case EV_FF:
1365 __set_bit(code, dev->ffbit);
1366 break;
1367
1368 case EV_PWR:
1369 /* do nothing */
1370 break;
1371
1372 default:
1373 printk(KERN_ERR
1374 "input_set_capability: unknown type %u (code %u)\n",
1375 type, code);
1376 dump_stack();
1377 return;
1378 }
1379
1380 __set_bit(type, dev->evbit);
1381}
1382EXPORT_SYMBOL(input_set_capability);
1383
1384/**
1385 * input_register_device - register device with input core
1386 * @dev: device to be registered
1387 *
1388 * This function registers device with input core. The device must be
1389 * allocated with input_allocate_device() and all it's capabilities
1390 * set up before registering.
1391 * If function fails the device must be freed with input_free_device().
1392 * Once device has been successfully registered it can be unregistered
1393 * with input_unregister_device(); input_free_device() should not be
1394 * called in this case.
1395 */
1396int input_register_device(struct input_dev *dev)
1397{
1398 static atomic_t input_no = ATOMIC_INIT(0);
1399 struct input_handler *handler;
1400 const char *path;
1401 int error;
1402
1403 __set_bit(EV_SYN, dev->evbit);
1404
1405 /*
1406 * If delay and period are pre-set by the driver, then autorepeating
1407 * is handled by the driver itself and we don't do it in input.c.
1408 */
1409
1410 init_timer(&dev->timer);
1411 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1412 dev->timer.data = (long) dev;
1413 dev->timer.function = input_repeat_key;
1414 dev->rep[REP_DELAY] = 250;
1415 dev->rep[REP_PERIOD] = 33;
1416 }
1417
1418 if (!dev->getkeycode)
1419 dev->getkeycode = input_default_getkeycode;
1420
1421 if (!dev->setkeycode)
1422 dev->setkeycode = input_default_setkeycode;
1423
1424 dev_set_name(&dev->dev, "input%ld",
1425 (unsigned long) atomic_inc_return(&input_no) - 1);
1426
1427 error = device_add(&dev->dev);
1428 if (error)
1429 return error;
1430
1431 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1432 printk(KERN_INFO "input: %s as %s\n",
1433 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1434 kfree(path);
1435
1436 error = mutex_lock_interruptible(&input_mutex);
1437 if (error) {
1438 device_del(&dev->dev);
1439 return error;
1440 }
1441
1442 list_add_tail(&dev->node, &input_dev_list);
1443
1444 list_for_each_entry(handler, &input_handler_list, node)
1445 input_attach_handler(dev, handler);
1446
1447 input_wakeup_procfs_readers();
1448
1449 mutex_unlock(&input_mutex);
1450
1451 return 0;
1452}
1453EXPORT_SYMBOL(input_register_device);
1454
1455/**
1456 * input_unregister_device - unregister previously registered device
1457 * @dev: device to be unregistered
1458 *
1459 * This function unregisters an input device. Once device is unregistered
1460 * the caller should not try to access it as it may get freed at any moment.
1461 */
1462void input_unregister_device(struct input_dev *dev)
1463{
1464 struct input_handle *handle, *next;
1465
1466 input_disconnect_device(dev);
1467
1468 mutex_lock(&input_mutex);
1469
1470 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1471 handle->handler->disconnect(handle);
1472 WARN_ON(!list_empty(&dev->h_list));
1473
1474 del_timer_sync(&dev->timer);
1475 list_del_init(&dev->node);
1476
1477 input_wakeup_procfs_readers();
1478
1479 mutex_unlock(&input_mutex);
1480
1481 device_unregister(&dev->dev);
1482}
1483EXPORT_SYMBOL(input_unregister_device);
1484
1485/**
1486 * input_register_handler - register a new input handler
1487 * @handler: handler to be registered
1488 *
1489 * This function registers a new input handler (interface) for input
1490 * devices in the system and attaches it to all input devices that
1491 * are compatible with the handler.
1492 */
1493int input_register_handler(struct input_handler *handler)
1494{
1495 struct input_dev *dev;
1496 int retval;
1497
1498 retval = mutex_lock_interruptible(&input_mutex);
1499 if (retval)
1500 return retval;
1501
1502 INIT_LIST_HEAD(&handler->h_list);
1503
1504 if (handler->fops != NULL) {
1505 if (input_table[handler->minor >> 5]) {
1506 retval = -EBUSY;
1507 goto out;
1508 }
1509 input_table[handler->minor >> 5] = handler;
1510 }
1511
1512 list_add_tail(&handler->node, &input_handler_list);
1513
1514 list_for_each_entry(dev, &input_dev_list, node)
1515 input_attach_handler(dev, handler);
1516
1517 input_wakeup_procfs_readers();
1518
1519 out:
1520 mutex_unlock(&input_mutex);
1521 return retval;
1522}
1523EXPORT_SYMBOL(input_register_handler);
1524
1525/**
1526 * input_unregister_handler - unregisters an input handler
1527 * @handler: handler to be unregistered
1528 *
1529 * This function disconnects a handler from its input devices and
1530 * removes it from lists of known handlers.
1531 */
1532void input_unregister_handler(struct input_handler *handler)
1533{
1534 struct input_handle *handle, *next;
1535
1536 mutex_lock(&input_mutex);
1537
1538 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1539 handler->disconnect(handle);
1540 WARN_ON(!list_empty(&handler->h_list));
1541
1542 list_del_init(&handler->node);
1543
1544 if (handler->fops != NULL)
1545 input_table[handler->minor >> 5] = NULL;
1546
1547 input_wakeup_procfs_readers();
1548
1549 mutex_unlock(&input_mutex);
1550}
1551EXPORT_SYMBOL(input_unregister_handler);
1552
1553/**
1554 * input_register_handle - register a new input handle
1555 * @handle: handle to register
1556 *
1557 * This function puts a new input handle onto device's
1558 * and handler's lists so that events can flow through
1559 * it once it is opened using input_open_device().
1560 *
1561 * This function is supposed to be called from handler's
1562 * connect() method.
1563 */
1564int input_register_handle(struct input_handle *handle)
1565{
1566 struct input_handler *handler = handle->handler;
1567 struct input_dev *dev = handle->dev;
1568 int error;
1569
1570 /*
1571 * We take dev->mutex here to prevent race with
1572 * input_release_device().
1573 */
1574 error = mutex_lock_interruptible(&dev->mutex);
1575 if (error)
1576 return error;
1577 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1578 mutex_unlock(&dev->mutex);
1579
1580 /*
1581 * Since we are supposed to be called from ->connect()
1582 * which is mutually exclusive with ->disconnect()
1583 * we can't be racing with input_unregister_handle()
1584 * and so separate lock is not needed here.
1585 */
1586 list_add_tail(&handle->h_node, &handler->h_list);
1587
1588 if (handler->start)
1589 handler->start(handle);
1590
1591 return 0;
1592}
1593EXPORT_SYMBOL(input_register_handle);
1594
1595/**
1596 * input_unregister_handle - unregister an input handle
1597 * @handle: handle to unregister
1598 *
1599 * This function removes input handle from device's
1600 * and handler's lists.
1601 *
1602 * This function is supposed to be called from handler's
1603 * disconnect() method.
1604 */
1605void input_unregister_handle(struct input_handle *handle)
1606{
1607 struct input_dev *dev = handle->dev;
1608
1609 list_del_init(&handle->h_node);
1610
1611 /*
1612 * Take dev->mutex to prevent race with input_release_device().
1613 */
1614 mutex_lock(&dev->mutex);
1615 list_del_rcu(&handle->d_node);
1616 mutex_unlock(&dev->mutex);
1617 synchronize_rcu();
1618}
1619EXPORT_SYMBOL(input_unregister_handle);
1620
1621static int input_open_file(struct inode *inode, struct file *file)
1622{
1623 struct input_handler *handler;
1624 const struct file_operations *old_fops, *new_fops = NULL;
1625 int err;
1626
1627 lock_kernel();
1628 /* No load-on-demand here? */
1629 handler = input_table[iminor(inode) >> 5];
1630 if (!handler || !(new_fops = fops_get(handler->fops))) {
1631 err = -ENODEV;
1632 goto out;
1633 }
1634
1635 /*
1636 * That's _really_ odd. Usually NULL ->open means "nothing special",
1637 * not "no device". Oh, well...
1638 */
1639 if (!new_fops->open) {
1640 fops_put(new_fops);
1641 err = -ENODEV;
1642 goto out;
1643 }
1644 old_fops = file->f_op;
1645 file->f_op = new_fops;
1646
1647 err = new_fops->open(inode, file);
1648
1649 if (err) {
1650 fops_put(file->f_op);
1651 file->f_op = fops_get(old_fops);
1652 }
1653 fops_put(old_fops);
1654out:
1655 unlock_kernel();
1656 return err;
1657}
1658
1659static const struct file_operations input_fops = {
1660 .owner = THIS_MODULE,
1661 .open = input_open_file,
1662};
1663
1664static void __init input_init_abs_bypass(void)
1665{
1666 const unsigned int *p;
1667
1668 for (p = input_abs_bypass_init_data; *p; p++)
1669 input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
1670}
1671
1672static int __init input_init(void)
1673{
1674 int err;
1675
1676 input_init_abs_bypass();
1677
1678 err = class_register(&input_class);
1679 if (err) {
1680 printk(KERN_ERR "input: unable to register input_dev class\n");
1681 return err;
1682 }
1683
1684 err = input_proc_init();
1685 if (err)
1686 goto fail1;
1687
1688 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1689 if (err) {
1690 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1691 goto fail2;
1692 }
1693
1694 return 0;
1695
1696 fail2: input_proc_exit();
1697 fail1: class_unregister(&input_class);
1698 return err;
1699}
1700
1701static void __exit input_exit(void)
1702{
1703 input_proc_exit();
1704 unregister_chrdev(INPUT_MAJOR, "input");
1705 class_unregister(&input_class);
1706}
1707
1708subsys_initcall(input_init);
1709module_exit(input_exit);