projects/linux·blob 61844250 · 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
25MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
26MODULE_DESCRIPTION("Input core");
27MODULE_LICENSE("GPL");
28
29#define INPUT_DEVICES 256
30
31static LIST_HEAD(input_dev_list);
32static LIST_HEAD(input_handler_list);
33
34/*
35 * input_mutex protects access to both input_dev_list and input_handler_list.
36 * This also causes input_[un]register_device and input_[un]register_handler
37 * be mutually exclusive which simplifies locking in drivers implementing
38 * input handlers.
39 */
40static DEFINE_MUTEX(input_mutex);
41
42static struct input_handler *input_table[8];
43
44static inline int is_event_supported(unsigned int code,
45 unsigned long *bm, unsigned int max)
46{
47 return code <= max && test_bit(code, bm);
48}
49
50static int input_defuzz_abs_event(int value, int old_val, int fuzz)
51{
52 if (fuzz) {
53 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
54 return old_val;
55
56 if (value > old_val - fuzz && value < old_val + fuzz)
57 return (old_val * 3 + value) / 4;
58
59 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
60 return (old_val + value) / 2;
61 }
62
63 return value;
64}
65
66/*
67 * Pass event through all open handles. This function is called with
68 * dev->event_lock held and interrupts disabled.
69 */
70static void input_pass_event(struct input_dev *dev,
71 unsigned int type, unsigned int code, int value)
72{
73 struct input_handle *handle;
74
75 rcu_read_lock();
76
77 handle = rcu_dereference(dev->grab);
78 if (handle)
79 handle->handler->event(handle, type, code, value);
80 else
81 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
82 if (handle->open)
83 handle->handler->event(handle,
84 type, code, value);
85 rcu_read_unlock();
86}
87
88/*
89 * Generate software autorepeat event. Note that we take
90 * dev->event_lock here to avoid racing with input_event
91 * which may cause keys get "stuck".
92 */
93static void input_repeat_key(unsigned long data)
94{
95 struct input_dev *dev = (void *) data;
96 unsigned long flags;
97
98 spin_lock_irqsave(&dev->event_lock, flags);
99
100 if (test_bit(dev->repeat_key, dev->key) &&
101 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
102
103 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
104
105 if (dev->sync) {
106 /*
107 * Only send SYN_REPORT if we are not in a middle
108 * of driver parsing a new hardware packet.
109 * Otherwise assume that the driver will send
110 * SYN_REPORT once it's done.
111 */
112 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
113 }
114
115 if (dev->rep[REP_PERIOD])
116 mod_timer(&dev->timer, jiffies +
117 msecs_to_jiffies(dev->rep[REP_PERIOD]));
118 }
119
120 spin_unlock_irqrestore(&dev->event_lock, flags);
121}
122
123static void input_start_autorepeat(struct input_dev *dev, int code)
124{
125 if (test_bit(EV_REP, dev->evbit) &&
126 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
127 dev->timer.data) {
128 dev->repeat_key = code;
129 mod_timer(&dev->timer,
130 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
131 }
132}
133
134#define INPUT_IGNORE_EVENT 0
135#define INPUT_PASS_TO_HANDLERS 1
136#define INPUT_PASS_TO_DEVICE 2
137#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
138
139static void input_handle_event(struct input_dev *dev,
140 unsigned int type, unsigned int code, int value)
141{
142 int disposition = INPUT_IGNORE_EVENT;
143
144 switch (type) {
145
146 case EV_SYN:
147 switch (code) {
148 case SYN_CONFIG:
149 disposition = INPUT_PASS_TO_ALL;
150 break;
151
152 case SYN_REPORT:
153 if (!dev->sync) {
154 dev->sync = 1;
155 disposition = INPUT_PASS_TO_HANDLERS;
156 }
157 break;
158 }
159 break;
160
161 case EV_KEY:
162 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
163 !!test_bit(code, dev->key) != value) {
164
165 if (value != 2) {
166 __change_bit(code, dev->key);
167 if (value)
168 input_start_autorepeat(dev, code);
169 }
170
171 disposition = INPUT_PASS_TO_HANDLERS;
172 }
173 break;
174
175 case EV_SW:
176 if (is_event_supported(code, dev->swbit, SW_MAX) &&
177 !!test_bit(code, dev->sw) != value) {
178
179 __change_bit(code, dev->sw);
180 disposition = INPUT_PASS_TO_HANDLERS;
181 }
182 break;
183
184 case EV_ABS:
185 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
186
187 value = input_defuzz_abs_event(value,
188 dev->abs[code], dev->absfuzz[code]);
189
190 if (dev->abs[code] != value) {
191 dev->abs[code] = value;
192 disposition = INPUT_PASS_TO_HANDLERS;
193 }
194 }
195 break;
196
197 case EV_REL:
198 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
199 disposition = INPUT_PASS_TO_HANDLERS;
200
201 break;
202
203 case EV_MSC:
204 if (is_event_supported(code, dev->mscbit, MSC_MAX))
205 disposition = INPUT_PASS_TO_ALL;
206
207 break;
208
209 case EV_LED:
210 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
211 !!test_bit(code, dev->led) != value) {
212
213 __change_bit(code, dev->led);
214 disposition = INPUT_PASS_TO_ALL;
215 }
216 break;
217
218 case EV_SND:
219 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
220
221 if (!!test_bit(code, dev->snd) != !!value)
222 __change_bit(code, dev->snd);
223 disposition = INPUT_PASS_TO_ALL;
224 }
225 break;
226
227 case EV_REP:
228 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
229 dev->rep[code] = value;
230 disposition = INPUT_PASS_TO_ALL;
231 }
232 break;
233
234 case EV_FF:
235 if (value >= 0)
236 disposition = INPUT_PASS_TO_ALL;
237 break;
238
239 case EV_PWR:
240 disposition = INPUT_PASS_TO_ALL;
241 break;
242 }
243
244 if (type != EV_SYN)
245 dev->sync = 0;
246
247 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
248 dev->event(dev, type, code, value);
249
250 if (disposition & INPUT_PASS_TO_HANDLERS)
251 input_pass_event(dev, type, code, value);
252}
253
254/**
255 * input_event() - report new input event
256 * @dev: device that generated the event
257 * @type: type of the event
258 * @code: event code
259 * @value: value of the event
260 *
261 * This function should be used by drivers implementing various input
262 * devices. See also input_inject_event().
263 */
264
265void input_event(struct input_dev *dev,
266 unsigned int type, unsigned int code, int value)
267{
268 unsigned long flags;
269
270 if (is_event_supported(type, dev->evbit, EV_MAX)) {
271
272 spin_lock_irqsave(&dev->event_lock, flags);
273 add_input_randomness(type, code, value);
274 input_handle_event(dev, type, code, value);
275 spin_unlock_irqrestore(&dev->event_lock, flags);
276 }
277}
278EXPORT_SYMBOL(input_event);
279
280/**
281 * input_inject_event() - send input event from input handler
282 * @handle: input handle to send event through
283 * @type: type of the event
284 * @code: event code
285 * @value: value of the event
286 *
287 * Similar to input_event() but will ignore event if device is
288 * "grabbed" and handle injecting event is not the one that owns
289 * the device.
290 */
291void input_inject_event(struct input_handle *handle,
292 unsigned int type, unsigned int code, int value)
293{
294 struct input_dev *dev = handle->dev;
295 struct input_handle *grab;
296 unsigned long flags;
297
298 if (is_event_supported(type, dev->evbit, EV_MAX)) {
299 spin_lock_irqsave(&dev->event_lock, flags);
300
301 rcu_read_lock();
302 grab = rcu_dereference(dev->grab);
303 if (!grab || grab == handle)
304 input_handle_event(dev, type, code, value);
305 rcu_read_unlock();
306
307 spin_unlock_irqrestore(&dev->event_lock, flags);
308 }
309}
310EXPORT_SYMBOL(input_inject_event);
311
312/**
313 * input_grab_device - grabs device for exclusive use
314 * @handle: input handle that wants to own the device
315 *
316 * When a device is grabbed by an input handle all events generated by
317 * the device are delivered only to this handle. Also events injected
318 * by other input handles are ignored while device is grabbed.
319 */
320int input_grab_device(struct input_handle *handle)
321{
322 struct input_dev *dev = handle->dev;
323 int retval;
324
325 retval = mutex_lock_interruptible(&dev->mutex);
326 if (retval)
327 return retval;
328
329 if (dev->grab) {
330 retval = -EBUSY;
331 goto out;
332 }
333
334 rcu_assign_pointer(dev->grab, handle);
335 synchronize_rcu();
336
337 out:
338 mutex_unlock(&dev->mutex);
339 return retval;
340}
341EXPORT_SYMBOL(input_grab_device);
342
343static void __input_release_device(struct input_handle *handle)
344{
345 struct input_dev *dev = handle->dev;
346
347 if (dev->grab == handle) {
348 rcu_assign_pointer(dev->grab, NULL);
349 /* Make sure input_pass_event() notices that grab is gone */
350 synchronize_rcu();
351
352 list_for_each_entry(handle, &dev->h_list, d_node)
353 if (handle->open && handle->handler->start)
354 handle->handler->start(handle);
355 }
356}
357
358/**
359 * input_release_device - release previously grabbed device
360 * @handle: input handle that owns the device
361 *
362 * Releases previously grabbed device so that other input handles can
363 * start receiving input events. Upon release all handlers attached
364 * to the device have their start() method called so they have a change
365 * to synchronize device state with the rest of the system.
366 */
367void input_release_device(struct input_handle *handle)
368{
369 struct input_dev *dev = handle->dev;
370
371 mutex_lock(&dev->mutex);
372 __input_release_device(handle);
373 mutex_unlock(&dev->mutex);
374}
375EXPORT_SYMBOL(input_release_device);
376
377/**
378 * input_open_device - open input device
379 * @handle: handle through which device is being accessed
380 *
381 * This function should be called by input handlers when they
382 * want to start receive events from given input device.
383 */
384int input_open_device(struct input_handle *handle)
385{
386 struct input_dev *dev = handle->dev;
387 int retval;
388
389 retval = mutex_lock_interruptible(&dev->mutex);
390 if (retval)
391 return retval;
392
393 if (dev->going_away) {
394 retval = -ENODEV;
395 goto out;
396 }
397
398 handle->open++;
399
400 if (!dev->users++ && dev->open)
401 retval = dev->open(dev);
402
403 if (retval) {
404 dev->users--;
405 if (!--handle->open) {
406 /*
407 * Make sure we are not delivering any more events
408 * through this handle
409 */
410 synchronize_rcu();
411 }
412 }
413
414 out:
415 mutex_unlock(&dev->mutex);
416 return retval;
417}
418EXPORT_SYMBOL(input_open_device);
419
420int input_flush_device(struct input_handle *handle, struct file *file)
421{
422 struct input_dev *dev = handle->dev;
423 int retval;
424
425 retval = mutex_lock_interruptible(&dev->mutex);
426 if (retval)
427 return retval;
428
429 if (dev->flush)
430 retval = dev->flush(dev, file);
431
432 mutex_unlock(&dev->mutex);
433 return retval;
434}
435EXPORT_SYMBOL(input_flush_device);
436
437/**
438 * input_close_device - close input device
439 * @handle: handle through which device is being accessed
440 *
441 * This function should be called by input handlers when they
442 * want to stop receive events from given input device.
443 */
444void input_close_device(struct input_handle *handle)
445{
446 struct input_dev *dev = handle->dev;
447
448 mutex_lock(&dev->mutex);
449
450 __input_release_device(handle);
451
452 if (!--dev->users && dev->close)
453 dev->close(dev);
454
455 if (!--handle->open) {
456 /*
457 * synchronize_rcu() makes sure that input_pass_event()
458 * completed and that no more input events are delivered
459 * through this handle
460 */
461 synchronize_rcu();
462 }
463
464 mutex_unlock(&dev->mutex);
465}
466EXPORT_SYMBOL(input_close_device);
467
468/*
469 * Prepare device for unregistering
470 */
471static void input_disconnect_device(struct input_dev *dev)
472{
473 struct input_handle *handle;
474 int code;
475
476 /*
477 * Mark device as going away. Note that we take dev->mutex here
478 * not to protect access to dev->going_away but rather to ensure
479 * that there are no threads in the middle of input_open_device()
480 */
481 mutex_lock(&dev->mutex);
482 dev->going_away = 1;
483 mutex_unlock(&dev->mutex);
484
485 spin_lock_irq(&dev->event_lock);
486
487 /*
488 * Simulate keyup events for all pressed keys so that handlers
489 * are not left with "stuck" keys. The driver may continue
490 * generate events even after we done here but they will not
491 * reach any handlers.
492 */
493 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
494 for (code = 0; code <= KEY_MAX; code++) {
495 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
496 __test_and_clear_bit(code, dev->key)) {
497 input_pass_event(dev, EV_KEY, code, 0);
498 }
499 }
500 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
501 }
502
503 list_for_each_entry(handle, &dev->h_list, d_node)
504 handle->open = 0;
505
506 spin_unlock_irq(&dev->event_lock);
507}
508
509static int input_fetch_keycode(struct input_dev *dev, int scancode)
510{
511 switch (dev->keycodesize) {
512 case 1:
513 return ((u8 *)dev->keycode)[scancode];
514
515 case 2:
516 return ((u16 *)dev->keycode)[scancode];
517
518 default:
519 return ((u32 *)dev->keycode)[scancode];
520 }
521}
522
523static int input_default_getkeycode(struct input_dev *dev,
524 int scancode, int *keycode)
525{
526 if (!dev->keycodesize)
527 return -EINVAL;
528
529 if (scancode >= dev->keycodemax)
530 return -EINVAL;
531
532 *keycode = input_fetch_keycode(dev, scancode);
533
534 return 0;
535}
536
537static int input_default_setkeycode(struct input_dev *dev,
538 int scancode, int keycode)
539{
540 int old_keycode;
541 int i;
542
543 if (scancode >= dev->keycodemax)
544 return -EINVAL;
545
546 if (!dev->keycodesize)
547 return -EINVAL;
548
549 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
550 return -EINVAL;
551
552 switch (dev->keycodesize) {
553 case 1: {
554 u8 *k = (u8 *)dev->keycode;
555 old_keycode = k[scancode];
556 k[scancode] = keycode;
557 break;
558 }
559 case 2: {
560 u16 *k = (u16 *)dev->keycode;
561 old_keycode = k[scancode];
562 k[scancode] = keycode;
563 break;
564 }
565 default: {
566 u32 *k = (u32 *)dev->keycode;
567 old_keycode = k[scancode];
568 k[scancode] = keycode;
569 break;
570 }
571 }
572
573 clear_bit(old_keycode, dev->keybit);
574 set_bit(keycode, dev->keybit);
575
576 for (i = 0; i < dev->keycodemax; i++) {
577 if (input_fetch_keycode(dev, i) == old_keycode) {
578 set_bit(old_keycode, dev->keybit);
579 break; /* Setting the bit twice is useless, so break */
580 }
581 }
582
583 return 0;
584}
585
586/**
587 * input_get_keycode - retrieve keycode currently mapped to a given scancode
588 * @dev: input device which keymap is being queried
589 * @scancode: scancode (or its equivalent for device in question) for which
590 * keycode is needed
591 * @keycode: result
592 *
593 * This function should be called by anyone interested in retrieving current
594 * keymap. Presently keyboard and evdev handlers use it.
595 */
596int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
597{
598 if (scancode < 0)
599 return -EINVAL;
600
601 return dev->getkeycode(dev, scancode, keycode);
602}
603EXPORT_SYMBOL(input_get_keycode);
604
605/**
606 * input_get_keycode - assign new keycode to a given scancode
607 * @dev: input device which keymap is being updated
608 * @scancode: scancode (or its equivalent for device in question)
609 * @keycode: new keycode to be assigned to the scancode
610 *
611 * This function should be called by anyone needing to update current
612 * keymap. Presently keyboard and evdev handlers use it.
613 */
614int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
615{
616 unsigned long flags;
617 int old_keycode;
618 int retval;
619
620 if (scancode < 0)
621 return -EINVAL;
622
623 if (keycode < 0 || keycode > KEY_MAX)
624 return -EINVAL;
625
626 spin_lock_irqsave(&dev->event_lock, flags);
627
628 retval = dev->getkeycode(dev, scancode, &old_keycode);
629 if (retval)
630 goto out;
631
632 retval = dev->setkeycode(dev, scancode, keycode);
633 if (retval)
634 goto out;
635
636 /*
637 * Simulate keyup event if keycode is not present
638 * in the keymap anymore
639 */
640 if (test_bit(EV_KEY, dev->evbit) &&
641 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
642 __test_and_clear_bit(old_keycode, dev->key)) {
643
644 input_pass_event(dev, EV_KEY, old_keycode, 0);
645 if (dev->sync)
646 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
647 }
648
649 out:
650 spin_unlock_irqrestore(&dev->event_lock, flags);
651
652 return retval;
653}
654EXPORT_SYMBOL(input_set_keycode);
655
656#define MATCH_BIT(bit, max) \
657 for (i = 0; i < BITS_TO_LONGS(max); i++) \
658 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
659 break; \
660 if (i != BITS_TO_LONGS(max)) \
661 continue;
662
663static const struct input_device_id *input_match_device(const struct input_device_id *id,
664 struct input_dev *dev)
665{
666 int i;
667
668 for (; id->flags || id->driver_info; id++) {
669
670 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
671 if (id->bustype != dev->id.bustype)
672 continue;
673
674 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
675 if (id->vendor != dev->id.vendor)
676 continue;
677
678 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
679 if (id->product != dev->id.product)
680 continue;
681
682 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
683 if (id->version != dev->id.version)
684 continue;
685
686 MATCH_BIT(evbit, EV_MAX);
687 MATCH_BIT(keybit, KEY_MAX);
688 MATCH_BIT(relbit, REL_MAX);
689 MATCH_BIT(absbit, ABS_MAX);
690 MATCH_BIT(mscbit, MSC_MAX);
691 MATCH_BIT(ledbit, LED_MAX);
692 MATCH_BIT(sndbit, SND_MAX);
693 MATCH_BIT(ffbit, FF_MAX);
694 MATCH_BIT(swbit, SW_MAX);
695
696 return id;
697 }
698
699 return NULL;
700}
701
702static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
703{
704 const struct input_device_id *id;
705 int error;
706
707 if (handler->blacklist && input_match_device(handler->blacklist, dev))
708 return -ENODEV;
709
710 id = input_match_device(handler->id_table, dev);
711 if (!id)
712 return -ENODEV;
713
714 error = handler->connect(handler, dev, id);
715 if (error && error != -ENODEV)
716 printk(KERN_ERR
717 "input: failed to attach handler %s to device %s, "
718 "error: %d\n",
719 handler->name, kobject_name(&dev->dev.kobj), error);
720
721 return error;
722}
723
724
725#ifdef CONFIG_PROC_FS
726
727static struct proc_dir_entry *proc_bus_input_dir;
728static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
729static int input_devices_state;
730
731static inline void input_wakeup_procfs_readers(void)
732{
733 input_devices_state++;
734 wake_up(&input_devices_poll_wait);
735}
736
737static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
738{
739 int state = input_devices_state;
740
741 poll_wait(file, &input_devices_poll_wait, wait);
742 if (state != input_devices_state)
743 return POLLIN | POLLRDNORM;
744
745 return 0;
746}
747
748static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
749{
750 if (mutex_lock_interruptible(&input_mutex))
751 return NULL;
752
753 return seq_list_start(&input_dev_list, *pos);
754}
755
756static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
757{
758 return seq_list_next(v, &input_dev_list, pos);
759}
760
761static void input_devices_seq_stop(struct seq_file *seq, void *v)
762{
763 mutex_unlock(&input_mutex);
764}
765
766static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
767 unsigned long *bitmap, int max)
768{
769 int i;
770
771 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
772 if (bitmap[i])
773 break;
774
775 seq_printf(seq, "B: %s=", name);
776 for (; i >= 0; i--)
777 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
778 seq_putc(seq, '\n');
779}
780
781static int input_devices_seq_show(struct seq_file *seq, void *v)
782{
783 struct input_dev *dev = container_of(v, struct input_dev, node);
784 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
785 struct input_handle *handle;
786
787 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
788 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
789
790 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
791 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
792 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
793 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
794 seq_printf(seq, "H: Handlers=");
795
796 list_for_each_entry(handle, &dev->h_list, d_node)
797 seq_printf(seq, "%s ", handle->name);
798 seq_putc(seq, '\n');
799
800 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
801 if (test_bit(EV_KEY, dev->evbit))
802 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
803 if (test_bit(EV_REL, dev->evbit))
804 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
805 if (test_bit(EV_ABS, dev->evbit))
806 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
807 if (test_bit(EV_MSC, dev->evbit))
808 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
809 if (test_bit(EV_LED, dev->evbit))
810 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
811 if (test_bit(EV_SND, dev->evbit))
812 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
813 if (test_bit(EV_FF, dev->evbit))
814 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
815 if (test_bit(EV_SW, dev->evbit))
816 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
817
818 seq_putc(seq, '\n');
819
820 kfree(path);
821 return 0;
822}
823
824static const struct seq_operations input_devices_seq_ops = {
825 .start = input_devices_seq_start,
826 .next = input_devices_seq_next,
827 .stop = input_devices_seq_stop,
828 .show = input_devices_seq_show,
829};
830
831static int input_proc_devices_open(struct inode *inode, struct file *file)
832{
833 return seq_open(file, &input_devices_seq_ops);
834}
835
836static const struct file_operations input_devices_fileops = {
837 .owner = THIS_MODULE,
838 .open = input_proc_devices_open,
839 .poll = input_proc_devices_poll,
840 .read = seq_read,
841 .llseek = seq_lseek,
842 .release = seq_release,
843};
844
845static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
846{
847 if (mutex_lock_interruptible(&input_mutex))
848 return NULL;
849
850 seq->private = (void *)(unsigned long)*pos;
851 return seq_list_start(&input_handler_list, *pos);
852}
853
854static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
855{
856 seq->private = (void *)(unsigned long)(*pos + 1);
857 return seq_list_next(v, &input_handler_list, pos);
858}
859
860static void input_handlers_seq_stop(struct seq_file *seq, void *v)
861{
862 mutex_unlock(&input_mutex);
863}
864
865static int input_handlers_seq_show(struct seq_file *seq, void *v)
866{
867 struct input_handler *handler = container_of(v, struct input_handler, node);
868
869 seq_printf(seq, "N: Number=%ld Name=%s",
870 (unsigned long)seq->private, handler->name);
871 if (handler->fops)
872 seq_printf(seq, " Minor=%d", handler->minor);
873 seq_putc(seq, '\n');
874
875 return 0;
876}
877static const struct seq_operations input_handlers_seq_ops = {
878 .start = input_handlers_seq_start,
879 .next = input_handlers_seq_next,
880 .stop = input_handlers_seq_stop,
881 .show = input_handlers_seq_show,
882};
883
884static int input_proc_handlers_open(struct inode *inode, struct file *file)
885{
886 return seq_open(file, &input_handlers_seq_ops);
887}
888
889static const struct file_operations input_handlers_fileops = {
890 .owner = THIS_MODULE,
891 .open = input_proc_handlers_open,
892 .read = seq_read,
893 .llseek = seq_lseek,
894 .release = seq_release,
895};
896
897static int __init input_proc_init(void)
898{
899 struct proc_dir_entry *entry;
900
901 proc_bus_input_dir = proc_mkdir("input", proc_bus);
902 if (!proc_bus_input_dir)
903 return -ENOMEM;
904
905 proc_bus_input_dir->owner = THIS_MODULE;
906
907 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
908 if (!entry)
909 goto fail1;
910
911 entry->owner = THIS_MODULE;
912 entry->proc_fops = &input_devices_fileops;
913
914 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
915 if (!entry)
916 goto fail2;
917
918 entry->owner = THIS_MODULE;
919 entry->proc_fops = &input_handlers_fileops;
920
921 return 0;
922
923 fail2: remove_proc_entry("devices", proc_bus_input_dir);
924 fail1: remove_proc_entry("input", proc_bus);
925 return -ENOMEM;
926}
927
928static void input_proc_exit(void)
929{
930 remove_proc_entry("devices", proc_bus_input_dir);
931 remove_proc_entry("handlers", proc_bus_input_dir);
932 remove_proc_entry("input", proc_bus);
933}
934
935#else /* !CONFIG_PROC_FS */
936static inline void input_wakeup_procfs_readers(void) { }
937static inline int input_proc_init(void) { return 0; }
938static inline void input_proc_exit(void) { }
939#endif
940
941#define INPUT_DEV_STRING_ATTR_SHOW(name) \
942static ssize_t input_dev_show_##name(struct device *dev, \
943 struct device_attribute *attr, \
944 char *buf) \
945{ \
946 struct input_dev *input_dev = to_input_dev(dev); \
947 \
948 return scnprintf(buf, PAGE_SIZE, "%s\n", \
949 input_dev->name ? input_dev->name : ""); \
950} \
951static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
952
953INPUT_DEV_STRING_ATTR_SHOW(name);
954INPUT_DEV_STRING_ATTR_SHOW(phys);
955INPUT_DEV_STRING_ATTR_SHOW(uniq);
956
957static int input_print_modalias_bits(char *buf, int size,
958 char name, unsigned long *bm,
959 unsigned int min_bit, unsigned int max_bit)
960{
961 int len = 0, i;
962
963 len += snprintf(buf, max(size, 0), "%c", name);
964 for (i = min_bit; i < max_bit; i++)
965 if (bm[BIT_WORD(i)] & BIT_MASK(i))
966 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
967 return len;
968}
969
970static int input_print_modalias(char *buf, int size, struct input_dev *id,
971 int add_cr)
972{
973 int len;
974
975 len = snprintf(buf, max(size, 0),
976 "input:b%04Xv%04Xp%04Xe%04X-",
977 id->id.bustype, id->id.vendor,
978 id->id.product, id->id.version);
979
980 len += input_print_modalias_bits(buf + len, size - len,
981 'e', id->evbit, 0, EV_MAX);
982 len += input_print_modalias_bits(buf + len, size - len,
983 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
984 len += input_print_modalias_bits(buf + len, size - len,
985 'r', id->relbit, 0, REL_MAX);
986 len += input_print_modalias_bits(buf + len, size - len,
987 'a', id->absbit, 0, ABS_MAX);
988 len += input_print_modalias_bits(buf + len, size - len,
989 'm', id->mscbit, 0, MSC_MAX);
990 len += input_print_modalias_bits(buf + len, size - len,
991 'l', id->ledbit, 0, LED_MAX);
992 len += input_print_modalias_bits(buf + len, size - len,
993 's', id->sndbit, 0, SND_MAX);
994 len += input_print_modalias_bits(buf + len, size - len,
995 'f', id->ffbit, 0, FF_MAX);
996 len += input_print_modalias_bits(buf + len, size - len,
997 'w', id->swbit, 0, SW_MAX);
998
999 if (add_cr)
1000 len += snprintf(buf + len, max(size - len, 0), "\n");
1001
1002 return len;
1003}
1004
1005static ssize_t input_dev_show_modalias(struct device *dev,
1006 struct device_attribute *attr,
1007 char *buf)
1008{
1009 struct input_dev *id = to_input_dev(dev);
1010 ssize_t len;
1011
1012 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1013
1014 return min_t(int, len, PAGE_SIZE);
1015}
1016static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1017
1018static struct attribute *input_dev_attrs[] = {
1019 &dev_attr_name.attr,
1020 &dev_attr_phys.attr,
1021 &dev_attr_uniq.attr,
1022 &dev_attr_modalias.attr,
1023 NULL
1024};
1025
1026static struct attribute_group input_dev_attr_group = {
1027 .attrs = input_dev_attrs,
1028};
1029
1030#define INPUT_DEV_ID_ATTR(name) \
1031static ssize_t input_dev_show_id_##name(struct device *dev, \
1032 struct device_attribute *attr, \
1033 char *buf) \
1034{ \
1035 struct input_dev *input_dev = to_input_dev(dev); \
1036 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1037} \
1038static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1039
1040INPUT_DEV_ID_ATTR(bustype);
1041INPUT_DEV_ID_ATTR(vendor);
1042INPUT_DEV_ID_ATTR(product);
1043INPUT_DEV_ID_ATTR(version);
1044
1045static struct attribute *input_dev_id_attrs[] = {
1046 &dev_attr_bustype.attr,
1047 &dev_attr_vendor.attr,
1048 &dev_attr_product.attr,
1049 &dev_attr_version.attr,
1050 NULL
1051};
1052
1053static struct attribute_group input_dev_id_attr_group = {
1054 .name = "id",
1055 .attrs = input_dev_id_attrs,
1056};
1057
1058static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1059 int max, int add_cr)
1060{
1061 int i;
1062 int len = 0;
1063
1064 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
1065 if (bitmap[i])
1066 break;
1067
1068 for (; i >= 0; i--)
1069 len += snprintf(buf + len, max(buf_size - len, 0),
1070 "%lx%s", bitmap[i], i > 0 ? " " : "");
1071
1072 if (add_cr)
1073 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1074
1075 return len;
1076}
1077
1078#define INPUT_DEV_CAP_ATTR(ev, bm) \
1079static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1080 struct device_attribute *attr, \
1081 char *buf) \
1082{ \
1083 struct input_dev *input_dev = to_input_dev(dev); \
1084 int len = input_print_bitmap(buf, PAGE_SIZE, \
1085 input_dev->bm##bit, ev##_MAX, 1); \
1086 return min_t(int, len, PAGE_SIZE); \
1087} \
1088static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1089
1090INPUT_DEV_CAP_ATTR(EV, ev);
1091INPUT_DEV_CAP_ATTR(KEY, key);
1092INPUT_DEV_CAP_ATTR(REL, rel);
1093INPUT_DEV_CAP_ATTR(ABS, abs);
1094INPUT_DEV_CAP_ATTR(MSC, msc);
1095INPUT_DEV_CAP_ATTR(LED, led);
1096INPUT_DEV_CAP_ATTR(SND, snd);
1097INPUT_DEV_CAP_ATTR(FF, ff);
1098INPUT_DEV_CAP_ATTR(SW, sw);
1099
1100static struct attribute *input_dev_caps_attrs[] = {
1101 &dev_attr_ev.attr,
1102 &dev_attr_key.attr,
1103 &dev_attr_rel.attr,
1104 &dev_attr_abs.attr,
1105 &dev_attr_msc.attr,
1106 &dev_attr_led.attr,
1107 &dev_attr_snd.attr,
1108 &dev_attr_ff.attr,
1109 &dev_attr_sw.attr,
1110 NULL
1111};
1112
1113static struct attribute_group input_dev_caps_attr_group = {
1114 .name = "capabilities",
1115 .attrs = input_dev_caps_attrs,
1116};
1117
1118static struct attribute_group *input_dev_attr_groups[] = {
1119 &input_dev_attr_group,
1120 &input_dev_id_attr_group,
1121 &input_dev_caps_attr_group,
1122 NULL
1123};
1124
1125static void input_dev_release(struct device *device)
1126{
1127 struct input_dev *dev = to_input_dev(device);
1128
1129 input_ff_destroy(dev);
1130 kfree(dev);
1131
1132 module_put(THIS_MODULE);
1133}
1134
1135/*
1136 * Input uevent interface - loading event handlers based on
1137 * device bitfields.
1138 */
1139static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1140 const char *name, unsigned long *bitmap, int max)
1141{
1142 int len;
1143
1144 if (add_uevent_var(env, "%s=", name))
1145 return -ENOMEM;
1146
1147 len = input_print_bitmap(&env->buf[env->buflen - 1],
1148 sizeof(env->buf) - env->buflen,
1149 bitmap, max, 0);
1150 if (len >= (sizeof(env->buf) - env->buflen))
1151 return -ENOMEM;
1152
1153 env->buflen += len;
1154 return 0;
1155}
1156
1157static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1158 struct input_dev *dev)
1159{
1160 int len;
1161
1162 if (add_uevent_var(env, "MODALIAS="))
1163 return -ENOMEM;
1164
1165 len = input_print_modalias(&env->buf[env->buflen - 1],
1166 sizeof(env->buf) - env->buflen,
1167 dev, 0);
1168 if (len >= (sizeof(env->buf) - env->buflen))
1169 return -ENOMEM;
1170
1171 env->buflen += len;
1172 return 0;
1173}
1174
1175#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1176 do { \
1177 int err = add_uevent_var(env, fmt, val); \
1178 if (err) \
1179 return err; \
1180 } while (0)
1181
1182#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1183 do { \
1184 int err = input_add_uevent_bm_var(env, name, bm, max); \
1185 if (err) \
1186 return err; \
1187 } while (0)
1188
1189#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1190 do { \
1191 int err = input_add_uevent_modalias_var(env, dev); \
1192 if (err) \
1193 return err; \
1194 } while (0)
1195
1196static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1197{
1198 struct input_dev *dev = to_input_dev(device);
1199
1200 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1201 dev->id.bustype, dev->id.vendor,
1202 dev->id.product, dev->id.version);
1203 if (dev->name)
1204 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1205 if (dev->phys)
1206 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1207 if (dev->uniq)
1208 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1209
1210 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1211 if (test_bit(EV_KEY, dev->evbit))
1212 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1213 if (test_bit(EV_REL, dev->evbit))
1214 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1215 if (test_bit(EV_ABS, dev->evbit))
1216 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1217 if (test_bit(EV_MSC, dev->evbit))
1218 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1219 if (test_bit(EV_LED, dev->evbit))
1220 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1221 if (test_bit(EV_SND, dev->evbit))
1222 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1223 if (test_bit(EV_FF, dev->evbit))
1224 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1225 if (test_bit(EV_SW, dev->evbit))
1226 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1227
1228 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1229
1230 return 0;
1231}
1232
1233static struct device_type input_dev_type = {
1234 .groups = input_dev_attr_groups,
1235 .release = input_dev_release,
1236 .uevent = input_dev_uevent,
1237};
1238
1239struct class input_class = {
1240 .name = "input",
1241};
1242EXPORT_SYMBOL_GPL(input_class);
1243
1244/**
1245 * input_allocate_device - allocate memory for new input device
1246 *
1247 * Returns prepared struct input_dev or NULL.
1248 *
1249 * NOTE: Use input_free_device() to free devices that have not been
1250 * registered; input_unregister_device() should be used for already
1251 * registered devices.
1252 */
1253struct input_dev *input_allocate_device(void)
1254{
1255 struct input_dev *dev;
1256
1257 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1258 if (dev) {
1259 dev->dev.type = &input_dev_type;
1260 dev->dev.class = &input_class;
1261 device_initialize(&dev->dev);
1262 mutex_init(&dev->mutex);
1263 spin_lock_init(&dev->event_lock);
1264 INIT_LIST_HEAD(&dev->h_list);
1265 INIT_LIST_HEAD(&dev->node);
1266
1267 __module_get(THIS_MODULE);
1268 }
1269
1270 return dev;
1271}
1272EXPORT_SYMBOL(input_allocate_device);
1273
1274/**
1275 * input_free_device - free memory occupied by input_dev structure
1276 * @dev: input device to free
1277 *
1278 * This function should only be used if input_register_device()
1279 * was not called yet or if it failed. Once device was registered
1280 * use input_unregister_device() and memory will be freed once last
1281 * reference to the device is dropped.
1282 *
1283 * Device should be allocated by input_allocate_device().
1284 *
1285 * NOTE: If there are references to the input device then memory
1286 * will not be freed until last reference is dropped.
1287 */
1288void input_free_device(struct input_dev *dev)
1289{
1290 if (dev)
1291 input_put_device(dev);
1292}
1293EXPORT_SYMBOL(input_free_device);
1294
1295/**
1296 * input_set_capability - mark device as capable of a certain event
1297 * @dev: device that is capable of emitting or accepting event
1298 * @type: type of the event (EV_KEY, EV_REL, etc...)
1299 * @code: event code
1300 *
1301 * In addition to setting up corresponding bit in appropriate capability
1302 * bitmap the function also adjusts dev->evbit.
1303 */
1304void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1305{
1306 switch (type) {
1307 case EV_KEY:
1308 __set_bit(code, dev->keybit);
1309 break;
1310
1311 case EV_REL:
1312 __set_bit(code, dev->relbit);
1313 break;
1314
1315 case EV_ABS:
1316 __set_bit(code, dev->absbit);
1317 break;
1318
1319 case EV_MSC:
1320 __set_bit(code, dev->mscbit);
1321 break;
1322
1323 case EV_SW:
1324 __set_bit(code, dev->swbit);
1325 break;
1326
1327 case EV_LED:
1328 __set_bit(code, dev->ledbit);
1329 break;
1330
1331 case EV_SND:
1332 __set_bit(code, dev->sndbit);
1333 break;
1334
1335 case EV_FF:
1336 __set_bit(code, dev->ffbit);
1337 break;
1338
1339 case EV_PWR:
1340 /* do nothing */
1341 break;
1342
1343 default:
1344 printk(KERN_ERR
1345 "input_set_capability: unknown type %u (code %u)\n",
1346 type, code);
1347 dump_stack();
1348 return;
1349 }
1350
1351 __set_bit(type, dev->evbit);
1352}
1353EXPORT_SYMBOL(input_set_capability);
1354
1355/**
1356 * input_register_device - register device with input core
1357 * @dev: device to be registered
1358 *
1359 * This function registers device with input core. The device must be
1360 * allocated with input_allocate_device() and all it's capabilities
1361 * set up before registering.
1362 * If function fails the device must be freed with input_free_device().
1363 * Once device has been successfully registered it can be unregistered
1364 * with input_unregister_device(); input_free_device() should not be
1365 * called in this case.
1366 */
1367int input_register_device(struct input_dev *dev)
1368{
1369 static atomic_t input_no = ATOMIC_INIT(0);
1370 struct input_handler *handler;
1371 const char *path;
1372 int error;
1373
1374 __set_bit(EV_SYN, dev->evbit);
1375
1376 /*
1377 * If delay and period are pre-set by the driver, then autorepeating
1378 * is handled by the driver itself and we don't do it in input.c.
1379 */
1380
1381 init_timer(&dev->timer);
1382 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1383 dev->timer.data = (long) dev;
1384 dev->timer.function = input_repeat_key;
1385 dev->rep[REP_DELAY] = 250;
1386 dev->rep[REP_PERIOD] = 33;
1387 }
1388
1389 if (!dev->getkeycode)
1390 dev->getkeycode = input_default_getkeycode;
1391
1392 if (!dev->setkeycode)
1393 dev->setkeycode = input_default_setkeycode;
1394
1395 snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
1396 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1397
1398 error = device_add(&dev->dev);
1399 if (error)
1400 return error;
1401
1402 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1403 printk(KERN_INFO "input: %s as %s\n",
1404 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1405 kfree(path);
1406
1407 error = mutex_lock_interruptible(&input_mutex);
1408 if (error) {
1409 device_del(&dev->dev);
1410 return error;
1411 }
1412
1413 list_add_tail(&dev->node, &input_dev_list);
1414
1415 list_for_each_entry(handler, &input_handler_list, node)
1416 input_attach_handler(dev, handler);
1417
1418 input_wakeup_procfs_readers();
1419
1420 mutex_unlock(&input_mutex);
1421
1422 return 0;
1423}
1424EXPORT_SYMBOL(input_register_device);
1425
1426/**
1427 * input_unregister_device - unregister previously registered device
1428 * @dev: device to be unregistered
1429 *
1430 * This function unregisters an input device. Once device is unregistered
1431 * the caller should not try to access it as it may get freed at any moment.
1432 */
1433void input_unregister_device(struct input_dev *dev)
1434{
1435 struct input_handle *handle, *next;
1436
1437 input_disconnect_device(dev);
1438
1439 mutex_lock(&input_mutex);
1440
1441 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1442 handle->handler->disconnect(handle);
1443 WARN_ON(!list_empty(&dev->h_list));
1444
1445 del_timer_sync(&dev->timer);
1446 list_del_init(&dev->node);
1447
1448 input_wakeup_procfs_readers();
1449
1450 mutex_unlock(&input_mutex);
1451
1452 device_unregister(&dev->dev);
1453}
1454EXPORT_SYMBOL(input_unregister_device);
1455
1456/**
1457 * input_register_handler - register a new input handler
1458 * @handler: handler to be registered
1459 *
1460 * This function registers a new input handler (interface) for input
1461 * devices in the system and attaches it to all input devices that
1462 * are compatible with the handler.
1463 */
1464int input_register_handler(struct input_handler *handler)
1465{
1466 struct input_dev *dev;
1467 int retval;
1468
1469 retval = mutex_lock_interruptible(&input_mutex);
1470 if (retval)
1471 return retval;
1472
1473 INIT_LIST_HEAD(&handler->h_list);
1474
1475 if (handler->fops != NULL) {
1476 if (input_table[handler->minor >> 5]) {
1477 retval = -EBUSY;
1478 goto out;
1479 }
1480 input_table[handler->minor >> 5] = handler;
1481 }
1482
1483 list_add_tail(&handler->node, &input_handler_list);
1484
1485 list_for_each_entry(dev, &input_dev_list, node)
1486 input_attach_handler(dev, handler);
1487
1488 input_wakeup_procfs_readers();
1489
1490 out:
1491 mutex_unlock(&input_mutex);
1492 return retval;
1493}
1494EXPORT_SYMBOL(input_register_handler);
1495
1496/**
1497 * input_unregister_handler - unregisters an input handler
1498 * @handler: handler to be unregistered
1499 *
1500 * This function disconnects a handler from its input devices and
1501 * removes it from lists of known handlers.
1502 */
1503void input_unregister_handler(struct input_handler *handler)
1504{
1505 struct input_handle *handle, *next;
1506
1507 mutex_lock(&input_mutex);
1508
1509 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1510 handler->disconnect(handle);
1511 WARN_ON(!list_empty(&handler->h_list));
1512
1513 list_del_init(&handler->node);
1514
1515 if (handler->fops != NULL)
1516 input_table[handler->minor >> 5] = NULL;
1517
1518 input_wakeup_procfs_readers();
1519
1520 mutex_unlock(&input_mutex);
1521}
1522EXPORT_SYMBOL(input_unregister_handler);
1523
1524/**
1525 * input_register_handle - register a new input handle
1526 * @handle: handle to register
1527 *
1528 * This function puts a new input handle onto device's
1529 * and handler's lists so that events can flow through
1530 * it once it is opened using input_open_device().
1531 *
1532 * This function is supposed to be called from handler's
1533 * connect() method.
1534 */
1535int input_register_handle(struct input_handle *handle)
1536{
1537 struct input_handler *handler = handle->handler;
1538 struct input_dev *dev = handle->dev;
1539 int error;
1540
1541 /*
1542 * We take dev->mutex here to prevent race with
1543 * input_release_device().
1544 */
1545 error = mutex_lock_interruptible(&dev->mutex);
1546 if (error)
1547 return error;
1548 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1549 mutex_unlock(&dev->mutex);
1550 synchronize_rcu();
1551
1552 /*
1553 * Since we are supposed to be called from ->connect()
1554 * which is mutually exclusive with ->disconnect()
1555 * we can't be racing with input_unregister_handle()
1556 * and so separate lock is not needed here.
1557 */
1558 list_add_tail(&handle->h_node, &handler->h_list);
1559
1560 if (handler->start)
1561 handler->start(handle);
1562
1563 return 0;
1564}
1565EXPORT_SYMBOL(input_register_handle);
1566
1567/**
1568 * input_unregister_handle - unregister an input handle
1569 * @handle: handle to unregister
1570 *
1571 * This function removes input handle from device's
1572 * and handler's lists.
1573 *
1574 * This function is supposed to be called from handler's
1575 * disconnect() method.
1576 */
1577void input_unregister_handle(struct input_handle *handle)
1578{
1579 struct input_dev *dev = handle->dev;
1580
1581 list_del_init(&handle->h_node);
1582
1583 /*
1584 * Take dev->mutex to prevent race with input_release_device().
1585 */
1586 mutex_lock(&dev->mutex);
1587 list_del_rcu(&handle->d_node);
1588 mutex_unlock(&dev->mutex);
1589 synchronize_rcu();
1590}
1591EXPORT_SYMBOL(input_unregister_handle);
1592
1593static int input_open_file(struct inode *inode, struct file *file)
1594{
1595 struct input_handler *handler = input_table[iminor(inode) >> 5];
1596 const struct file_operations *old_fops, *new_fops = NULL;
1597 int err;
1598
1599 /* No load-on-demand here? */
1600 if (!handler || !(new_fops = fops_get(handler->fops)))
1601 return -ENODEV;
1602
1603 /*
1604 * That's _really_ odd. Usually NULL ->open means "nothing special",
1605 * not "no device". Oh, well...
1606 */
1607 if (!new_fops->open) {
1608 fops_put(new_fops);
1609 return -ENODEV;
1610 }
1611 old_fops = file->f_op;
1612 file->f_op = new_fops;
1613
1614 err = new_fops->open(inode, file);
1615
1616 if (err) {
1617 fops_put(file->f_op);
1618 file->f_op = fops_get(old_fops);
1619 }
1620 fops_put(old_fops);
1621 return err;
1622}
1623
1624static const struct file_operations input_fops = {
1625 .owner = THIS_MODULE,
1626 .open = input_open_file,
1627};
1628
1629static int __init input_init(void)
1630{
1631 int err;
1632
1633 err = class_register(&input_class);
1634 if (err) {
1635 printk(KERN_ERR "input: unable to register input_dev class\n");
1636 return err;
1637 }
1638
1639 err = input_proc_init();
1640 if (err)
1641 goto fail1;
1642
1643 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1644 if (err) {
1645 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1646 goto fail2;
1647 }
1648
1649 return 0;
1650
1651 fail2: input_proc_exit();
1652 fail1: class_unregister(&input_class);
1653 return err;
1654}
1655
1656static void __exit input_exit(void)
1657{
1658 input_proc_exit();
1659 unregister_chrdev(INPUT_MAJOR, "input");
1660 class_unregister(&input_class);
1661}
1662
1663subsys_initcall(input_init);
1664module_exit(input_exit);