4 * Copyright (c) 1999-2002 Vojtech Pavlik
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.
13 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/input/mt.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/random.h>
21 #include <linux/major.h>
22 #include <linux/proc_fs.h>
23 #include <linux/sched.h>
24 #include <linux/seq_file.h>
25 #include <linux/poll.h>
26 #include <linux/device.h>
27 #include <linux/mutex.h>
28 #include <linux/rcupdate.h>
29 #include "input-compat.h"
31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
32 MODULE_DESCRIPTION("Input core");
33 MODULE_LICENSE("GPL");
35 #define INPUT_DEVICES 256
37 static LIST_HEAD(input_dev_list);
38 static LIST_HEAD(input_handler_list);
41 * input_mutex protects access to both input_dev_list and input_handler_list.
42 * This also causes input_[un]register_device and input_[un]register_handler
43 * be mutually exclusive which simplifies locking in drivers implementing
46 static DEFINE_MUTEX(input_mutex);
48 static struct input_handler *input_table[8];
50 static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
52 static inline int is_event_supported(unsigned int code,
53 unsigned long *bm, unsigned int max)
55 return code <= max && test_bit(code, bm);
58 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
61 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
64 if (value > old_val - fuzz && value < old_val + fuzz)
65 return (old_val * 3 + value) / 4;
67 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
68 return (old_val + value) / 2;
74 static void input_start_autorepeat(struct input_dev *dev, int code)
76 if (test_bit(EV_REP, dev->evbit) &&
77 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
79 dev->repeat_key = code;
80 mod_timer(&dev->timer,
81 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
85 static void input_stop_autorepeat(struct input_dev *dev)
87 del_timer(&dev->timer);
91 * Pass event first through all filters and then, if event has not been
92 * filtered out, through all open handles. This function is called with
93 * dev->event_lock held and interrupts disabled.
95 static unsigned int input_to_handler(struct input_handle *handle,
96 struct input_value *vals, unsigned int count)
98 struct input_handler *handler = handle->handler;
99 struct input_value *end = vals;
100 struct input_value *v;
102 for (v = vals; v != vals + count; v++) {
103 if (handler->filter &&
104 handler->filter(handle, v->type, v->code, v->value))
116 handler->events(handle, vals, count);
117 else if (handler->event)
118 for (v = vals; v != end; v++)
119 handler->event(handle, v->type, v->code, v->value);
125 * Pass values first through all filters and then, if event has not been
126 * filtered out, through all open handles. This function is called with
127 * dev->event_lock held and interrupts disabled.
129 static void input_pass_values(struct input_dev *dev,
130 struct input_value *vals, unsigned int count)
132 struct input_handle *handle;
133 struct input_value *v;
140 handle = rcu_dereference(dev->grab);
142 count = input_to_handler(handle, vals, count);
144 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
146 count = input_to_handler(handle, vals, count);
151 add_input_randomness(vals->type, vals->code, vals->value);
153 /* trigger auto repeat for key events */
154 for (v = vals; v != vals + count; v++) {
155 if (v->type == EV_KEY && v->value != 2) {
157 input_start_autorepeat(dev, v->code);
159 input_stop_autorepeat(dev);
164 static void input_pass_event(struct input_dev *dev,
165 unsigned int type, unsigned int code, int value)
167 struct input_value vals[] = { { type, code, value } };
169 input_pass_values(dev, vals, ARRAY_SIZE(vals));
173 * Generate software autorepeat event. Note that we take
174 * dev->event_lock here to avoid racing with input_event
175 * which may cause keys get "stuck".
177 static void input_repeat_key(unsigned long data)
179 struct input_dev *dev = (void *) data;
182 spin_lock_irqsave(&dev->event_lock, flags);
184 if (test_bit(dev->repeat_key, dev->key) &&
185 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
186 struct input_value vals[] = {
187 { EV_KEY, dev->repeat_key, 2 },
191 input_pass_values(dev, vals, ARRAY_SIZE(vals));
193 if (dev->rep[REP_PERIOD])
194 mod_timer(&dev->timer, jiffies +
195 msecs_to_jiffies(dev->rep[REP_PERIOD]));
198 spin_unlock_irqrestore(&dev->event_lock, flags);
201 #define INPUT_IGNORE_EVENT 0
202 #define INPUT_PASS_TO_HANDLERS 1
203 #define INPUT_PASS_TO_DEVICE 2
205 #define INPUT_FLUSH 8
206 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
208 static int input_handle_abs_event(struct input_dev *dev,
209 unsigned int code, int *pval)
211 struct input_mt *mt = dev->mt;
215 if (code == ABS_MT_SLOT) {
217 * "Stage" the event; we'll flush it later, when we
218 * get actual touch data.
220 if (mt && *pval >= 0 && *pval < mt->num_slots)
223 return INPUT_IGNORE_EVENT;
226 is_mt_event = input_is_mt_value(code);
229 pold = &dev->absinfo[code].value;
231 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
234 * Bypass filtering for multi-touch events when
235 * not employing slots.
241 *pval = input_defuzz_abs_event(*pval, *pold,
242 dev->absinfo[code].fuzz);
244 return INPUT_IGNORE_EVENT;
249 /* Flush pending "slot" event */
250 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
251 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
252 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
255 return INPUT_PASS_TO_HANDLERS;
258 static int input_get_disposition(struct input_dev *dev,
259 unsigned int type, unsigned int code, int value)
261 int disposition = INPUT_IGNORE_EVENT;
268 disposition = INPUT_PASS_TO_ALL;
272 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
275 disposition = INPUT_PASS_TO_HANDLERS;
281 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
283 /* auto-repeat bypasses state updates */
285 disposition = INPUT_PASS_TO_HANDLERS;
289 if (!!test_bit(code, dev->key) != !!value) {
291 __change_bit(code, dev->key);
292 disposition = INPUT_PASS_TO_HANDLERS;
298 if (is_event_supported(code, dev->swbit, SW_MAX) &&
299 !!test_bit(code, dev->sw) != !!value) {
301 __change_bit(code, dev->sw);
302 disposition = INPUT_PASS_TO_HANDLERS;
307 if (is_event_supported(code, dev->absbit, ABS_MAX))
308 disposition = input_handle_abs_event(dev, code, &value);
313 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
314 disposition = INPUT_PASS_TO_HANDLERS;
319 if (is_event_supported(code, dev->mscbit, MSC_MAX))
320 disposition = INPUT_PASS_TO_ALL;
325 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
326 !!test_bit(code, dev->led) != !!value) {
328 __change_bit(code, dev->led);
329 disposition = INPUT_PASS_TO_ALL;
334 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
336 if (!!test_bit(code, dev->snd) != !!value)
337 __change_bit(code, dev->snd);
338 disposition = INPUT_PASS_TO_ALL;
343 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
344 dev->rep[code] = value;
345 disposition = INPUT_PASS_TO_ALL;
351 disposition = INPUT_PASS_TO_ALL;
355 disposition = INPUT_PASS_TO_ALL;
362 static void input_handle_event(struct input_dev *dev,
363 unsigned int type, unsigned int code, int value)
367 disposition = input_get_disposition(dev, type, code, value);
369 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
370 dev->event(dev, type, code, value);
375 if (disposition & INPUT_PASS_TO_HANDLERS) {
376 struct input_value *v;
378 if (disposition & INPUT_SLOT) {
379 v = &dev->vals[dev->num_vals++];
381 v->code = ABS_MT_SLOT;
382 v->value = dev->mt->slot;
385 v = &dev->vals[dev->num_vals++];
391 if (disposition & INPUT_FLUSH) {
392 if (dev->num_vals >= 2)
393 input_pass_values(dev, dev->vals, dev->num_vals);
395 } else if (dev->num_vals >= dev->max_vals - 2) {
396 dev->vals[dev->num_vals++] = input_value_sync;
397 input_pass_values(dev, dev->vals, dev->num_vals);
404 * input_event() - report new input event
405 * @dev: device that generated the event
406 * @type: type of the event
408 * @value: value of the event
410 * This function should be used by drivers implementing various input
411 * devices to report input events. See also input_inject_event().
413 * NOTE: input_event() may be safely used right after input device was
414 * allocated with input_allocate_device(), even before it is registered
415 * with input_register_device(), but the event will not reach any of the
416 * input handlers. Such early invocation of input_event() may be used
417 * to 'seed' initial state of a switch or initial position of absolute
420 void input_event(struct input_dev *dev,
421 unsigned int type, unsigned int code, int value)
425 if (is_event_supported(type, dev->evbit, EV_MAX)) {
427 spin_lock_irqsave(&dev->event_lock, flags);
428 input_handle_event(dev, type, code, value);
429 spin_unlock_irqrestore(&dev->event_lock, flags);
432 EXPORT_SYMBOL(input_event);
435 * input_inject_event() - send input event from input handler
436 * @handle: input handle to send event through
437 * @type: type of the event
439 * @value: value of the event
441 * Similar to input_event() but will ignore event if device is
442 * "grabbed" and handle injecting event is not the one that owns
445 void input_inject_event(struct input_handle *handle,
446 unsigned int type, unsigned int code, int value)
448 struct input_dev *dev = handle->dev;
449 struct input_handle *grab;
452 if (is_event_supported(type, dev->evbit, EV_MAX)) {
453 spin_lock_irqsave(&dev->event_lock, flags);
456 grab = rcu_dereference(dev->grab);
457 if (!grab || grab == handle)
458 input_handle_event(dev, type, code, value);
461 spin_unlock_irqrestore(&dev->event_lock, flags);
464 EXPORT_SYMBOL(input_inject_event);
467 * input_alloc_absinfo - allocates array of input_absinfo structs
468 * @dev: the input device emitting absolute events
470 * If the absinfo struct the caller asked for is already allocated, this
471 * functions will not do anything.
473 void input_alloc_absinfo(struct input_dev *dev)
476 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
479 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
481 EXPORT_SYMBOL(input_alloc_absinfo);
483 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
484 int min, int max, int fuzz, int flat)
486 struct input_absinfo *absinfo;
488 input_alloc_absinfo(dev);
492 absinfo = &dev->absinfo[axis];
493 absinfo->minimum = min;
494 absinfo->maximum = max;
495 absinfo->fuzz = fuzz;
496 absinfo->flat = flat;
498 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
500 EXPORT_SYMBOL(input_set_abs_params);
504 * input_grab_device - grabs device for exclusive use
505 * @handle: input handle that wants to own the device
507 * When a device is grabbed by an input handle all events generated by
508 * the device are delivered only to this handle. Also events injected
509 * by other input handles are ignored while device is grabbed.
511 int input_grab_device(struct input_handle *handle)
513 struct input_dev *dev = handle->dev;
516 retval = mutex_lock_interruptible(&dev->mutex);
525 rcu_assign_pointer(dev->grab, handle);
528 mutex_unlock(&dev->mutex);
531 EXPORT_SYMBOL(input_grab_device);
533 static void __input_release_device(struct input_handle *handle)
535 struct input_dev *dev = handle->dev;
537 if (dev->grab == handle) {
538 rcu_assign_pointer(dev->grab, NULL);
539 /* Make sure input_pass_event() notices that grab is gone */
542 list_for_each_entry(handle, &dev->h_list, d_node)
543 if (handle->open && handle->handler->start)
544 handle->handler->start(handle);
549 * input_release_device - release previously grabbed device
550 * @handle: input handle that owns the device
552 * Releases previously grabbed device so that other input handles can
553 * start receiving input events. Upon release all handlers attached
554 * to the device have their start() method called so they have a change
555 * to synchronize device state with the rest of the system.
557 void input_release_device(struct input_handle *handle)
559 struct input_dev *dev = handle->dev;
561 mutex_lock(&dev->mutex);
562 __input_release_device(handle);
563 mutex_unlock(&dev->mutex);
565 EXPORT_SYMBOL(input_release_device);
568 * input_open_device - open input device
569 * @handle: handle through which device is being accessed
571 * This function should be called by input handlers when they
572 * want to start receive events from given input device.
574 int input_open_device(struct input_handle *handle)
576 struct input_dev *dev = handle->dev;
579 retval = mutex_lock_interruptible(&dev->mutex);
583 if (dev->going_away) {
590 if (!dev->users++ && dev->open)
591 retval = dev->open(dev);
595 if (!--handle->open) {
597 * Make sure we are not delivering any more events
598 * through this handle
605 mutex_unlock(&dev->mutex);
608 EXPORT_SYMBOL(input_open_device);
610 int input_flush_device(struct input_handle *handle, struct file *file)
612 struct input_dev *dev = handle->dev;
615 retval = mutex_lock_interruptible(&dev->mutex);
620 retval = dev->flush(dev, file);
622 mutex_unlock(&dev->mutex);
625 EXPORT_SYMBOL(input_flush_device);
628 * input_close_device - close input device
629 * @handle: handle through which device is being accessed
631 * This function should be called by input handlers when they
632 * want to stop receive events from given input device.
634 void input_close_device(struct input_handle *handle)
636 struct input_dev *dev = handle->dev;
638 mutex_lock(&dev->mutex);
640 __input_release_device(handle);
642 if (!--dev->users && dev->close)
645 if (!--handle->open) {
647 * synchronize_rcu() makes sure that input_pass_event()
648 * completed and that no more input events are delivered
649 * through this handle
654 mutex_unlock(&dev->mutex);
656 EXPORT_SYMBOL(input_close_device);
659 * Simulate keyup events for all keys that are marked as pressed.
660 * The function must be called with dev->event_lock held.
662 static void input_dev_release_keys(struct input_dev *dev)
666 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
667 for (code = 0; code <= KEY_MAX; code++) {
668 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
669 __test_and_clear_bit(code, dev->key)) {
670 input_pass_event(dev, EV_KEY, code, 0);
673 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
678 * Prepare device for unregistering
680 static void input_disconnect_device(struct input_dev *dev)
682 struct input_handle *handle;
685 * Mark device as going away. Note that we take dev->mutex here
686 * not to protect access to dev->going_away but rather to ensure
687 * that there are no threads in the middle of input_open_device()
689 mutex_lock(&dev->mutex);
690 dev->going_away = true;
691 mutex_unlock(&dev->mutex);
693 spin_lock_irq(&dev->event_lock);
696 * Simulate keyup events for all pressed keys so that handlers
697 * are not left with "stuck" keys. The driver may continue
698 * generate events even after we done here but they will not
699 * reach any handlers.
701 input_dev_release_keys(dev);
703 list_for_each_entry(handle, &dev->h_list, d_node)
706 spin_unlock_irq(&dev->event_lock);
710 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
711 * @ke: keymap entry containing scancode to be converted.
712 * @scancode: pointer to the location where converted scancode should
715 * This function is used to convert scancode stored in &struct keymap_entry
716 * into scalar form understood by legacy keymap handling methods. These
717 * methods expect scancodes to be represented as 'unsigned int'.
719 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
720 unsigned int *scancode)
724 *scancode = *((u8 *)ke->scancode);
728 *scancode = *((u16 *)ke->scancode);
732 *scancode = *((u32 *)ke->scancode);
741 EXPORT_SYMBOL(input_scancode_to_scalar);
744 * Those routines handle the default case where no [gs]etkeycode() is
745 * defined. In this case, an array indexed by the scancode is used.
748 static unsigned int input_fetch_keycode(struct input_dev *dev,
751 switch (dev->keycodesize) {
753 return ((u8 *)dev->keycode)[index];
756 return ((u16 *)dev->keycode)[index];
759 return ((u32 *)dev->keycode)[index];
763 static int input_default_getkeycode(struct input_dev *dev,
764 struct input_keymap_entry *ke)
769 if (!dev->keycodesize)
772 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
775 error = input_scancode_to_scalar(ke, &index);
780 if (index >= dev->keycodemax)
783 ke->keycode = input_fetch_keycode(dev, index);
785 ke->len = sizeof(index);
786 memcpy(ke->scancode, &index, sizeof(index));
791 static int input_default_setkeycode(struct input_dev *dev,
792 const struct input_keymap_entry *ke,
793 unsigned int *old_keycode)
799 if (!dev->keycodesize)
802 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
805 error = input_scancode_to_scalar(ke, &index);
810 if (index >= dev->keycodemax)
813 if (dev->keycodesize < sizeof(ke->keycode) &&
814 (ke->keycode >> (dev->keycodesize * 8)))
817 switch (dev->keycodesize) {
819 u8 *k = (u8 *)dev->keycode;
820 *old_keycode = k[index];
821 k[index] = ke->keycode;
825 u16 *k = (u16 *)dev->keycode;
826 *old_keycode = k[index];
827 k[index] = ke->keycode;
831 u32 *k = (u32 *)dev->keycode;
832 *old_keycode = k[index];
833 k[index] = ke->keycode;
838 __clear_bit(*old_keycode, dev->keybit);
839 __set_bit(ke->keycode, dev->keybit);
841 for (i = 0; i < dev->keycodemax; i++) {
842 if (input_fetch_keycode(dev, i) == *old_keycode) {
843 __set_bit(*old_keycode, dev->keybit);
844 break; /* Setting the bit twice is useless, so break */
852 * input_get_keycode - retrieve keycode currently mapped to a given scancode
853 * @dev: input device which keymap is being queried
856 * This function should be called by anyone interested in retrieving current
857 * keymap. Presently evdev handlers use it.
859 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
864 spin_lock_irqsave(&dev->event_lock, flags);
865 retval = dev->getkeycode(dev, ke);
866 spin_unlock_irqrestore(&dev->event_lock, flags);
870 EXPORT_SYMBOL(input_get_keycode);
873 * input_set_keycode - attribute a keycode to a given scancode
874 * @dev: input device which keymap is being updated
875 * @ke: new keymap entry
877 * This function should be called by anyone needing to update current
878 * keymap. Presently keyboard and evdev handlers use it.
880 int input_set_keycode(struct input_dev *dev,
881 const struct input_keymap_entry *ke)
884 unsigned int old_keycode;
887 if (ke->keycode > KEY_MAX)
890 spin_lock_irqsave(&dev->event_lock, flags);
892 retval = dev->setkeycode(dev, ke, &old_keycode);
896 /* Make sure KEY_RESERVED did not get enabled. */
897 __clear_bit(KEY_RESERVED, dev->keybit);
900 * Simulate keyup event if keycode is not present
901 * in the keymap anymore
903 if (test_bit(EV_KEY, dev->evbit) &&
904 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
905 __test_and_clear_bit(old_keycode, dev->key)) {
906 struct input_value vals[] = {
907 { EV_KEY, old_keycode, 0 },
911 input_pass_values(dev, vals, ARRAY_SIZE(vals));
915 spin_unlock_irqrestore(&dev->event_lock, flags);
919 EXPORT_SYMBOL(input_set_keycode);
921 static const struct input_device_id *input_match_device(struct input_handler *handler,
922 struct input_dev *dev)
924 const struct input_device_id *id;
926 for (id = handler->id_table; id->flags || id->driver_info; id++) {
928 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
929 if (id->bustype != dev->id.bustype)
932 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
933 if (id->vendor != dev->id.vendor)
936 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
937 if (id->product != dev->id.product)
940 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
941 if (id->version != dev->id.version)
944 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
947 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
950 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
953 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
956 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
959 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
962 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
965 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
968 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
971 if (!handler->match || handler->match(handler, dev))
978 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
980 const struct input_device_id *id;
983 id = input_match_device(handler, dev);
987 error = handler->connect(handler, dev, id);
988 if (error && error != -ENODEV)
989 pr_err("failed to attach handler %s to device %s, error: %d\n",
990 handler->name, kobject_name(&dev->dev.kobj), error);
997 static int input_bits_to_string(char *buf, int buf_size,
998 unsigned long bits, bool skip_empty)
1002 if (INPUT_COMPAT_TEST) {
1003 u32 dword = bits >> 32;
1004 if (dword || !skip_empty)
1005 len += snprintf(buf, buf_size, "%x ", dword);
1007 dword = bits & 0xffffffffUL;
1008 if (dword || !skip_empty || len)
1009 len += snprintf(buf + len, max(buf_size - len, 0),
1012 if (bits || !skip_empty)
1013 len += snprintf(buf, buf_size, "%lx", bits);
1019 #else /* !CONFIG_COMPAT */
1021 static int input_bits_to_string(char *buf, int buf_size,
1022 unsigned long bits, bool skip_empty)
1024 return bits || !skip_empty ?
1025 snprintf(buf, buf_size, "%lx", bits) : 0;
1030 #ifdef CONFIG_PROC_FS
1032 static struct proc_dir_entry *proc_bus_input_dir;
1033 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1034 static int input_devices_state;
1036 static inline void input_wakeup_procfs_readers(void)
1038 input_devices_state++;
1039 wake_up(&input_devices_poll_wait);
1042 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
1044 poll_wait(file, &input_devices_poll_wait, wait);
1045 if (file->f_version != input_devices_state) {
1046 file->f_version = input_devices_state;
1047 return POLLIN | POLLRDNORM;
1053 union input_seq_state {
1056 bool mutex_acquired;
1061 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1063 union input_seq_state *state = (union input_seq_state *)&seq->private;
1066 /* We need to fit into seq->private pointer */
1067 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1069 error = mutex_lock_interruptible(&input_mutex);
1071 state->mutex_acquired = false;
1072 return ERR_PTR(error);
1075 state->mutex_acquired = true;
1077 return seq_list_start(&input_dev_list, *pos);
1080 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1082 return seq_list_next(v, &input_dev_list, pos);
1085 static void input_seq_stop(struct seq_file *seq, void *v)
1087 union input_seq_state *state = (union input_seq_state *)&seq->private;
1089 if (state->mutex_acquired)
1090 mutex_unlock(&input_mutex);
1093 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1094 unsigned long *bitmap, int max)
1097 bool skip_empty = true;
1100 seq_printf(seq, "B: %s=", name);
1102 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1103 if (input_bits_to_string(buf, sizeof(buf),
1104 bitmap[i], skip_empty)) {
1106 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1111 * If no output was produced print a single 0.
1116 seq_putc(seq, '\n');
1119 static int input_devices_seq_show(struct seq_file *seq, void *v)
1121 struct input_dev *dev = container_of(v, struct input_dev, node);
1122 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1123 struct input_handle *handle;
1125 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1126 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1128 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1129 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1130 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1131 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1132 seq_printf(seq, "H: Handlers=");
1134 list_for_each_entry(handle, &dev->h_list, d_node)
1135 seq_printf(seq, "%s ", handle->name);
1136 seq_putc(seq, '\n');
1138 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1140 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1141 if (test_bit(EV_KEY, dev->evbit))
1142 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1143 if (test_bit(EV_REL, dev->evbit))
1144 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1145 if (test_bit(EV_ABS, dev->evbit))
1146 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1147 if (test_bit(EV_MSC, dev->evbit))
1148 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1149 if (test_bit(EV_LED, dev->evbit))
1150 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1151 if (test_bit(EV_SND, dev->evbit))
1152 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1153 if (test_bit(EV_FF, dev->evbit))
1154 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1155 if (test_bit(EV_SW, dev->evbit))
1156 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1158 seq_putc(seq, '\n');
1164 static const struct seq_operations input_devices_seq_ops = {
1165 .start = input_devices_seq_start,
1166 .next = input_devices_seq_next,
1167 .stop = input_seq_stop,
1168 .show = input_devices_seq_show,
1171 static int input_proc_devices_open(struct inode *inode, struct file *file)
1173 return seq_open(file, &input_devices_seq_ops);
1176 static const struct file_operations input_devices_fileops = {
1177 .owner = THIS_MODULE,
1178 .open = input_proc_devices_open,
1179 .poll = input_proc_devices_poll,
1181 .llseek = seq_lseek,
1182 .release = seq_release,
1185 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1187 union input_seq_state *state = (union input_seq_state *)&seq->private;
1190 /* We need to fit into seq->private pointer */
1191 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1193 error = mutex_lock_interruptible(&input_mutex);
1195 state->mutex_acquired = false;
1196 return ERR_PTR(error);
1199 state->mutex_acquired = true;
1202 return seq_list_start(&input_handler_list, *pos);
1205 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1207 union input_seq_state *state = (union input_seq_state *)&seq->private;
1209 state->pos = *pos + 1;
1210 return seq_list_next(v, &input_handler_list, pos);
1213 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1215 struct input_handler *handler = container_of(v, struct input_handler, node);
1216 union input_seq_state *state = (union input_seq_state *)&seq->private;
1218 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1219 if (handler->filter)
1220 seq_puts(seq, " (filter)");
1222 seq_printf(seq, " Minor=%d", handler->minor);
1223 seq_putc(seq, '\n');
1228 static const struct seq_operations input_handlers_seq_ops = {
1229 .start = input_handlers_seq_start,
1230 .next = input_handlers_seq_next,
1231 .stop = input_seq_stop,
1232 .show = input_handlers_seq_show,
1235 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1237 return seq_open(file, &input_handlers_seq_ops);
1240 static const struct file_operations input_handlers_fileops = {
1241 .owner = THIS_MODULE,
1242 .open = input_proc_handlers_open,
1244 .llseek = seq_lseek,
1245 .release = seq_release,
1248 static int __init input_proc_init(void)
1250 struct proc_dir_entry *entry;
1252 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1253 if (!proc_bus_input_dir)
1256 entry = proc_create("devices", 0, proc_bus_input_dir,
1257 &input_devices_fileops);
1261 entry = proc_create("handlers", 0, proc_bus_input_dir,
1262 &input_handlers_fileops);
1268 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1269 fail1: remove_proc_entry("bus/input", NULL);
1273 static void input_proc_exit(void)
1275 remove_proc_entry("devices", proc_bus_input_dir);
1276 remove_proc_entry("handlers", proc_bus_input_dir);
1277 remove_proc_entry("bus/input", NULL);
1280 #else /* !CONFIG_PROC_FS */
1281 static inline void input_wakeup_procfs_readers(void) { }
1282 static inline int input_proc_init(void) { return 0; }
1283 static inline void input_proc_exit(void) { }
1286 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1287 static ssize_t input_dev_show_##name(struct device *dev, \
1288 struct device_attribute *attr, \
1291 struct input_dev *input_dev = to_input_dev(dev); \
1293 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1294 input_dev->name ? input_dev->name : ""); \
1296 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1298 INPUT_DEV_STRING_ATTR_SHOW(name);
1299 INPUT_DEV_STRING_ATTR_SHOW(phys);
1300 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1302 static int input_print_modalias_bits(char *buf, int size,
1303 char name, unsigned long *bm,
1304 unsigned int min_bit, unsigned int max_bit)
1308 len += snprintf(buf, max(size, 0), "%c", name);
1309 for (i = min_bit; i < max_bit; i++)
1310 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1311 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1315 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1320 len = snprintf(buf, max(size, 0),
1321 "input:b%04Xv%04Xp%04Xe%04X-",
1322 id->id.bustype, id->id.vendor,
1323 id->id.product, id->id.version);
1325 len += input_print_modalias_bits(buf + len, size - len,
1326 'e', id->evbit, 0, EV_MAX);
1327 len += input_print_modalias_bits(buf + len, size - len,
1328 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1329 len += input_print_modalias_bits(buf + len, size - len,
1330 'r', id->relbit, 0, REL_MAX);
1331 len += input_print_modalias_bits(buf + len, size - len,
1332 'a', id->absbit, 0, ABS_MAX);
1333 len += input_print_modalias_bits(buf + len, size - len,
1334 'm', id->mscbit, 0, MSC_MAX);
1335 len += input_print_modalias_bits(buf + len, size - len,
1336 'l', id->ledbit, 0, LED_MAX);
1337 len += input_print_modalias_bits(buf + len, size - len,
1338 's', id->sndbit, 0, SND_MAX);
1339 len += input_print_modalias_bits(buf + len, size - len,
1340 'f', id->ffbit, 0, FF_MAX);
1341 len += input_print_modalias_bits(buf + len, size - len,
1342 'w', id->swbit, 0, SW_MAX);
1345 len += snprintf(buf + len, max(size - len, 0), "\n");
1350 static ssize_t input_dev_show_modalias(struct device *dev,
1351 struct device_attribute *attr,
1354 struct input_dev *id = to_input_dev(dev);
1357 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1359 return min_t(int, len, PAGE_SIZE);
1361 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1363 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1364 int max, int add_cr);
1366 static ssize_t input_dev_show_properties(struct device *dev,
1367 struct device_attribute *attr,
1370 struct input_dev *input_dev = to_input_dev(dev);
1371 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1372 INPUT_PROP_MAX, true);
1373 return min_t(int, len, PAGE_SIZE);
1375 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1377 static struct attribute *input_dev_attrs[] = {
1378 &dev_attr_name.attr,
1379 &dev_attr_phys.attr,
1380 &dev_attr_uniq.attr,
1381 &dev_attr_modalias.attr,
1382 &dev_attr_properties.attr,
1386 static struct attribute_group input_dev_attr_group = {
1387 .attrs = input_dev_attrs,
1390 #define INPUT_DEV_ID_ATTR(name) \
1391 static ssize_t input_dev_show_id_##name(struct device *dev, \
1392 struct device_attribute *attr, \
1395 struct input_dev *input_dev = to_input_dev(dev); \
1396 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1398 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1400 INPUT_DEV_ID_ATTR(bustype);
1401 INPUT_DEV_ID_ATTR(vendor);
1402 INPUT_DEV_ID_ATTR(product);
1403 INPUT_DEV_ID_ATTR(version);
1405 static struct attribute *input_dev_id_attrs[] = {
1406 &dev_attr_bustype.attr,
1407 &dev_attr_vendor.attr,
1408 &dev_attr_product.attr,
1409 &dev_attr_version.attr,
1413 static struct attribute_group input_dev_id_attr_group = {
1415 .attrs = input_dev_id_attrs,
1418 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1419 int max, int add_cr)
1423 bool skip_empty = true;
1425 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1426 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1427 bitmap[i], skip_empty);
1431 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1436 * If no output was produced print a single 0.
1439 len = snprintf(buf, buf_size, "%d", 0);
1442 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1447 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1448 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1449 struct device_attribute *attr, \
1452 struct input_dev *input_dev = to_input_dev(dev); \
1453 int len = input_print_bitmap(buf, PAGE_SIZE, \
1454 input_dev->bm##bit, ev##_MAX, \
1456 return min_t(int, len, PAGE_SIZE); \
1458 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1460 INPUT_DEV_CAP_ATTR(EV, ev);
1461 INPUT_DEV_CAP_ATTR(KEY, key);
1462 INPUT_DEV_CAP_ATTR(REL, rel);
1463 INPUT_DEV_CAP_ATTR(ABS, abs);
1464 INPUT_DEV_CAP_ATTR(MSC, msc);
1465 INPUT_DEV_CAP_ATTR(LED, led);
1466 INPUT_DEV_CAP_ATTR(SND, snd);
1467 INPUT_DEV_CAP_ATTR(FF, ff);
1468 INPUT_DEV_CAP_ATTR(SW, sw);
1470 static struct attribute *input_dev_caps_attrs[] = {
1483 static struct attribute_group input_dev_caps_attr_group = {
1484 .name = "capabilities",
1485 .attrs = input_dev_caps_attrs,
1488 static const struct attribute_group *input_dev_attr_groups[] = {
1489 &input_dev_attr_group,
1490 &input_dev_id_attr_group,
1491 &input_dev_caps_attr_group,
1495 static void input_dev_release(struct device *device)
1497 struct input_dev *dev = to_input_dev(device);
1499 input_ff_destroy(dev);
1500 input_mt_destroy_slots(dev);
1501 kfree(dev->absinfo);
1505 module_put(THIS_MODULE);
1509 * Input uevent interface - loading event handlers based on
1512 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1513 const char *name, unsigned long *bitmap, int max)
1517 if (add_uevent_var(env, "%s", name))
1520 len = input_print_bitmap(&env->buf[env->buflen - 1],
1521 sizeof(env->buf) - env->buflen,
1522 bitmap, max, false);
1523 if (len >= (sizeof(env->buf) - env->buflen))
1530 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1531 struct input_dev *dev)
1535 if (add_uevent_var(env, "MODALIAS="))
1538 len = input_print_modalias(&env->buf[env->buflen - 1],
1539 sizeof(env->buf) - env->buflen,
1541 if (len >= (sizeof(env->buf) - env->buflen))
1548 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1550 int err = add_uevent_var(env, fmt, val); \
1555 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1557 int err = input_add_uevent_bm_var(env, name, bm, max); \
1562 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1564 int err = input_add_uevent_modalias_var(env, dev); \
1569 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1571 struct input_dev *dev = to_input_dev(device);
1573 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1574 dev->id.bustype, dev->id.vendor,
1575 dev->id.product, dev->id.version);
1577 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1579 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1581 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1583 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1585 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1586 if (test_bit(EV_KEY, dev->evbit))
1587 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1588 if (test_bit(EV_REL, dev->evbit))
1589 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1590 if (test_bit(EV_ABS, dev->evbit))
1591 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1592 if (test_bit(EV_MSC, dev->evbit))
1593 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1594 if (test_bit(EV_LED, dev->evbit))
1595 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1596 if (test_bit(EV_SND, dev->evbit))
1597 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1598 if (test_bit(EV_FF, dev->evbit))
1599 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1600 if (test_bit(EV_SW, dev->evbit))
1601 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1603 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1608 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1613 if (!test_bit(EV_##type, dev->evbit)) \
1616 for (i = 0; i < type##_MAX; i++) { \
1617 if (!test_bit(i, dev->bits##bit)) \
1620 active = test_bit(i, dev->bits); \
1621 if (!active && !on) \
1624 dev->event(dev, EV_##type, i, on ? active : 0); \
1628 static void input_dev_toggle(struct input_dev *dev, bool activate)
1633 INPUT_DO_TOGGLE(dev, LED, led, activate);
1634 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1636 if (activate && test_bit(EV_REP, dev->evbit)) {
1637 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1638 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1643 * input_reset_device() - reset/restore the state of input device
1644 * @dev: input device whose state needs to be reset
1646 * This function tries to reset the state of an opened input device and
1647 * bring internal state and state if the hardware in sync with each other.
1648 * We mark all keys as released, restore LED state, repeat rate, etc.
1650 void input_reset_device(struct input_dev *dev)
1652 mutex_lock(&dev->mutex);
1655 input_dev_toggle(dev, true);
1658 * Keys that have been pressed at suspend time are unlikely
1659 * to be still pressed when we resume.
1661 spin_lock_irq(&dev->event_lock);
1662 input_dev_release_keys(dev);
1663 spin_unlock_irq(&dev->event_lock);
1666 mutex_unlock(&dev->mutex);
1668 EXPORT_SYMBOL(input_reset_device);
1671 static int input_dev_suspend(struct device *dev)
1673 struct input_dev *input_dev = to_input_dev(dev);
1675 mutex_lock(&input_dev->mutex);
1677 if (input_dev->users)
1678 input_dev_toggle(input_dev, false);
1680 mutex_unlock(&input_dev->mutex);
1685 static int input_dev_resume(struct device *dev)
1687 struct input_dev *input_dev = to_input_dev(dev);
1689 input_reset_device(input_dev);
1694 static const struct dev_pm_ops input_dev_pm_ops = {
1695 .suspend = input_dev_suspend,
1696 .resume = input_dev_resume,
1697 .poweroff = input_dev_suspend,
1698 .restore = input_dev_resume,
1700 #endif /* CONFIG_PM */
1702 static struct device_type input_dev_type = {
1703 .groups = input_dev_attr_groups,
1704 .release = input_dev_release,
1705 .uevent = input_dev_uevent,
1707 .pm = &input_dev_pm_ops,
1711 static char *input_devnode(struct device *dev, umode_t *mode)
1713 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1716 struct class input_class = {
1718 .devnode = input_devnode,
1720 EXPORT_SYMBOL_GPL(input_class);
1723 * input_allocate_device - allocate memory for new input device
1725 * Returns prepared struct input_dev or NULL.
1727 * NOTE: Use input_free_device() to free devices that have not been
1728 * registered; input_unregister_device() should be used for already
1729 * registered devices.
1731 struct input_dev *input_allocate_device(void)
1733 struct input_dev *dev;
1735 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1737 dev->dev.type = &input_dev_type;
1738 dev->dev.class = &input_class;
1739 device_initialize(&dev->dev);
1740 mutex_init(&dev->mutex);
1741 spin_lock_init(&dev->event_lock);
1742 INIT_LIST_HEAD(&dev->h_list);
1743 INIT_LIST_HEAD(&dev->node);
1745 __module_get(THIS_MODULE);
1750 EXPORT_SYMBOL(input_allocate_device);
1753 * input_free_device - free memory occupied by input_dev structure
1754 * @dev: input device to free
1756 * This function should only be used if input_register_device()
1757 * was not called yet or if it failed. Once device was registered
1758 * use input_unregister_device() and memory will be freed once last
1759 * reference to the device is dropped.
1761 * Device should be allocated by input_allocate_device().
1763 * NOTE: If there are references to the input device then memory
1764 * will not be freed until last reference is dropped.
1766 void input_free_device(struct input_dev *dev)
1769 input_put_device(dev);
1771 EXPORT_SYMBOL(input_free_device);
1774 * input_set_capability - mark device as capable of a certain event
1775 * @dev: device that is capable of emitting or accepting event
1776 * @type: type of the event (EV_KEY, EV_REL, etc...)
1779 * In addition to setting up corresponding bit in appropriate capability
1780 * bitmap the function also adjusts dev->evbit.
1782 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1786 __set_bit(code, dev->keybit);
1790 __set_bit(code, dev->relbit);
1794 __set_bit(code, dev->absbit);
1798 __set_bit(code, dev->mscbit);
1802 __set_bit(code, dev->swbit);
1806 __set_bit(code, dev->ledbit);
1810 __set_bit(code, dev->sndbit);
1814 __set_bit(code, dev->ffbit);
1822 pr_err("input_set_capability: unknown type %u (code %u)\n",
1828 __set_bit(type, dev->evbit);
1830 EXPORT_SYMBOL(input_set_capability);
1832 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1836 unsigned int events;
1839 mt_slots = dev->mt->num_slots;
1840 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1841 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1842 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1843 mt_slots = clamp(mt_slots, 2, 32);
1844 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1850 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1852 for (i = 0; i < ABS_CNT; i++) {
1853 if (test_bit(i, dev->absbit)) {
1854 if (input_is_mt_axis(i))
1861 for (i = 0; i < REL_CNT; i++)
1862 if (test_bit(i, dev->relbit))
1865 /* Make room for KEY and MSC events */
1871 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1873 if (!test_bit(EV_##type, dev->evbit)) \
1874 memset(dev->bits##bit, 0, \
1875 sizeof(dev->bits##bit)); \
1878 static void input_cleanse_bitmasks(struct input_dev *dev)
1880 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1881 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1882 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1883 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1884 INPUT_CLEANSE_BITMASK(dev, LED, led);
1885 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1886 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1887 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1891 * input_register_device - register device with input core
1892 * @dev: device to be registered
1894 * This function registers device with input core. The device must be
1895 * allocated with input_allocate_device() and all it's capabilities
1896 * set up before registering.
1897 * If function fails the device must be freed with input_free_device().
1898 * Once device has been successfully registered it can be unregistered
1899 * with input_unregister_device(); input_free_device() should not be
1900 * called in this case.
1902 int input_register_device(struct input_dev *dev)
1904 static atomic_t input_no = ATOMIC_INIT(0);
1905 struct input_handler *handler;
1906 unsigned int packet_size;
1910 /* Every input device generates EV_SYN/SYN_REPORT events. */
1911 __set_bit(EV_SYN, dev->evbit);
1913 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1914 __clear_bit(KEY_RESERVED, dev->keybit);
1916 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1917 input_cleanse_bitmasks(dev);
1919 packet_size = input_estimate_events_per_packet(dev);
1920 if (dev->hint_events_per_packet < packet_size)
1921 dev->hint_events_per_packet = packet_size;
1923 dev->max_vals = max(dev->hint_events_per_packet, packet_size) + 2;
1924 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
1929 * If delay and period are pre-set by the driver, then autorepeating
1930 * is handled by the driver itself and we don't do it in input.c.
1932 init_timer(&dev->timer);
1933 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1934 dev->timer.data = (long) dev;
1935 dev->timer.function = input_repeat_key;
1936 dev->rep[REP_DELAY] = 250;
1937 dev->rep[REP_PERIOD] = 33;
1940 if (!dev->getkeycode)
1941 dev->getkeycode = input_default_getkeycode;
1943 if (!dev->setkeycode)
1944 dev->setkeycode = input_default_setkeycode;
1946 dev_set_name(&dev->dev, "input%ld",
1947 (unsigned long) atomic_inc_return(&input_no) - 1);
1949 error = device_add(&dev->dev);
1953 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1954 pr_info("%s as %s\n",
1955 dev->name ? dev->name : "Unspecified device",
1956 path ? path : "N/A");
1959 error = mutex_lock_interruptible(&input_mutex);
1961 device_del(&dev->dev);
1965 list_add_tail(&dev->node, &input_dev_list);
1967 list_for_each_entry(handler, &input_handler_list, node)
1968 input_attach_handler(dev, handler);
1970 input_wakeup_procfs_readers();
1972 mutex_unlock(&input_mutex);
1976 EXPORT_SYMBOL(input_register_device);
1979 * input_unregister_device - unregister previously registered device
1980 * @dev: device to be unregistered
1982 * This function unregisters an input device. Once device is unregistered
1983 * the caller should not try to access it as it may get freed at any moment.
1985 void input_unregister_device(struct input_dev *dev)
1987 struct input_handle *handle, *next;
1989 input_disconnect_device(dev);
1991 mutex_lock(&input_mutex);
1993 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1994 handle->handler->disconnect(handle);
1995 WARN_ON(!list_empty(&dev->h_list));
1997 del_timer_sync(&dev->timer);
1998 list_del_init(&dev->node);
2000 input_wakeup_procfs_readers();
2002 mutex_unlock(&input_mutex);
2004 device_unregister(&dev->dev);
2006 EXPORT_SYMBOL(input_unregister_device);
2009 * input_register_handler - register a new input handler
2010 * @handler: handler to be registered
2012 * This function registers a new input handler (interface) for input
2013 * devices in the system and attaches it to all input devices that
2014 * are compatible with the handler.
2016 int input_register_handler(struct input_handler *handler)
2018 struct input_dev *dev;
2021 retval = mutex_lock_interruptible(&input_mutex);
2025 INIT_LIST_HEAD(&handler->h_list);
2027 if (handler->fops != NULL) {
2028 if (input_table[handler->minor >> 5]) {
2032 input_table[handler->minor >> 5] = handler;
2035 list_add_tail(&handler->node, &input_handler_list);
2037 list_for_each_entry(dev, &input_dev_list, node)
2038 input_attach_handler(dev, handler);
2040 input_wakeup_procfs_readers();
2043 mutex_unlock(&input_mutex);
2046 EXPORT_SYMBOL(input_register_handler);
2049 * input_unregister_handler - unregisters an input handler
2050 * @handler: handler to be unregistered
2052 * This function disconnects a handler from its input devices and
2053 * removes it from lists of known handlers.
2055 void input_unregister_handler(struct input_handler *handler)
2057 struct input_handle *handle, *next;
2059 mutex_lock(&input_mutex);
2061 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2062 handler->disconnect(handle);
2063 WARN_ON(!list_empty(&handler->h_list));
2065 list_del_init(&handler->node);
2067 if (handler->fops != NULL)
2068 input_table[handler->minor >> 5] = NULL;
2070 input_wakeup_procfs_readers();
2072 mutex_unlock(&input_mutex);
2074 EXPORT_SYMBOL(input_unregister_handler);
2077 * input_handler_for_each_handle - handle iterator
2078 * @handler: input handler to iterate
2079 * @data: data for the callback
2080 * @fn: function to be called for each handle
2082 * Iterate over @bus's list of devices, and call @fn for each, passing
2083 * it @data and stop when @fn returns a non-zero value. The function is
2084 * using RCU to traverse the list and therefore may be usind in atonic
2085 * contexts. The @fn callback is invoked from RCU critical section and
2086 * thus must not sleep.
2088 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2089 int (*fn)(struct input_handle *, void *))
2091 struct input_handle *handle;
2096 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2097 retval = fn(handle, data);
2106 EXPORT_SYMBOL(input_handler_for_each_handle);
2109 * input_register_handle - register a new input handle
2110 * @handle: handle to register
2112 * This function puts a new input handle onto device's
2113 * and handler's lists so that events can flow through
2114 * it once it is opened using input_open_device().
2116 * This function is supposed to be called from handler's
2119 int input_register_handle(struct input_handle *handle)
2121 struct input_handler *handler = handle->handler;
2122 struct input_dev *dev = handle->dev;
2126 * We take dev->mutex here to prevent race with
2127 * input_release_device().
2129 error = mutex_lock_interruptible(&dev->mutex);
2134 * Filters go to the head of the list, normal handlers
2137 if (handler->filter)
2138 list_add_rcu(&handle->d_node, &dev->h_list);
2140 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2142 mutex_unlock(&dev->mutex);
2145 * Since we are supposed to be called from ->connect()
2146 * which is mutually exclusive with ->disconnect()
2147 * we can't be racing with input_unregister_handle()
2148 * and so separate lock is not needed here.
2150 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2153 handler->start(handle);
2157 EXPORT_SYMBOL(input_register_handle);
2160 * input_unregister_handle - unregister an input handle
2161 * @handle: handle to unregister
2163 * This function removes input handle from device's
2164 * and handler's lists.
2166 * This function is supposed to be called from handler's
2167 * disconnect() method.
2169 void input_unregister_handle(struct input_handle *handle)
2171 struct input_dev *dev = handle->dev;
2173 list_del_rcu(&handle->h_node);
2176 * Take dev->mutex to prevent race with input_release_device().
2178 mutex_lock(&dev->mutex);
2179 list_del_rcu(&handle->d_node);
2180 mutex_unlock(&dev->mutex);
2184 EXPORT_SYMBOL(input_unregister_handle);
2186 static int input_open_file(struct inode *inode, struct file *file)
2188 struct input_handler *handler;
2189 const struct file_operations *old_fops, *new_fops = NULL;
2192 err = mutex_lock_interruptible(&input_mutex);
2196 /* No load-on-demand here? */
2197 handler = input_table[iminor(inode) >> 5];
2199 new_fops = fops_get(handler->fops);
2201 mutex_unlock(&input_mutex);
2204 * That's _really_ odd. Usually NULL ->open means "nothing special",
2205 * not "no device". Oh, well...
2207 if (!new_fops || !new_fops->open) {
2213 old_fops = file->f_op;
2214 file->f_op = new_fops;
2216 err = new_fops->open(inode, file);
2218 fops_put(file->f_op);
2219 file->f_op = fops_get(old_fops);
2226 static const struct file_operations input_fops = {
2227 .owner = THIS_MODULE,
2228 .open = input_open_file,
2229 .llseek = noop_llseek,
2232 static int __init input_init(void)
2236 err = class_register(&input_class);
2238 pr_err("unable to register input_dev class\n");
2242 err = input_proc_init();
2246 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2248 pr_err("unable to register char major %d", INPUT_MAJOR);
2254 fail2: input_proc_exit();
2255 fail1: class_unregister(&input_class);
2259 static void __exit input_exit(void)
2262 unregister_chrdev(INPUT_MAJOR, "input");
2263 class_unregister(&input_class);
2266 subsys_initcall(input_init);
2267 module_exit(input_exit);