1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (c) 1999-2002 Vojtech Pavlik
9 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/idr.h>
14 #include <linux/input/mt.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/sched.h>
21 #include <linux/seq_file.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25 #include <linux/rcupdate.h>
26 #include "input-compat.h"
27 #include "input-poller.h"
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
30 MODULE_DESCRIPTION("Input core");
31 MODULE_LICENSE("GPL");
33 #define INPUT_MAX_CHAR_DEVICES 1024
34 #define INPUT_FIRST_DYNAMIC_DEV 256
35 static DEFINE_IDA(input_ida);
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 const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
50 static inline int is_event_supported(unsigned int code,
51 unsigned long *bm, unsigned int max)
53 return code <= max && test_bit(code, bm);
56 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
59 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
62 if (value > old_val - fuzz && value < old_val + fuzz)
63 return (old_val * 3 + value) / 4;
65 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
66 return (old_val + value) / 2;
72 static void input_start_autorepeat(struct input_dev *dev, int code)
74 if (test_bit(EV_REP, dev->evbit) &&
75 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
76 dev->timer.function) {
77 dev->repeat_key = code;
78 mod_timer(&dev->timer,
79 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
83 static void input_stop_autorepeat(struct input_dev *dev)
85 del_timer(&dev->timer);
89 * Pass event first through all filters and then, if event has not been
90 * filtered out, through all open handles. This function is called with
91 * dev->event_lock held and interrupts disabled.
93 static unsigned int input_to_handler(struct input_handle *handle,
94 struct input_value *vals, unsigned int count)
96 struct input_handler *handler = handle->handler;
97 struct input_value *end = vals;
98 struct input_value *v;
100 if (handler->filter) {
101 for (v = vals; v != vals + count; v++) {
102 if (handler->filter(handle, v->type, v->code, v->value))
115 handler->events(handle, vals, count);
116 else if (handler->event)
117 for (v = vals; v != vals + count; v++)
118 handler->event(handle, v->type, v->code, v->value);
124 * Pass values first through all filters and then, if event has not been
125 * filtered out, through all open handles. This function is called with
126 * dev->event_lock held and interrupts disabled.
128 static void input_pass_values(struct input_dev *dev,
129 struct input_value *vals, unsigned int count)
131 struct input_handle *handle;
132 struct input_value *v;
139 handle = rcu_dereference(dev->grab);
141 count = input_to_handler(handle, vals, count);
143 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
145 count = input_to_handler(handle, vals, count);
153 /* trigger auto repeat for key events */
154 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
155 for (v = vals; v != vals + count; v++) {
156 if (v->type == EV_KEY && v->value != 2) {
158 input_start_autorepeat(dev, v->code);
160 input_stop_autorepeat(dev);
166 static void input_pass_event(struct input_dev *dev,
167 unsigned int type, unsigned int code, int value)
169 struct input_value vals[] = { { type, code, value } };
171 input_pass_values(dev, vals, ARRAY_SIZE(vals));
175 * Generate software autorepeat event. Note that we take
176 * dev->event_lock here to avoid racing with input_event
177 * which may cause keys get "stuck".
179 static void input_repeat_key(struct timer_list *t)
181 struct input_dev *dev = from_timer(dev, t, timer);
184 spin_lock_irqsave(&dev->event_lock, flags);
186 if (test_bit(dev->repeat_key, dev->key) &&
187 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
188 struct input_value vals[] = {
189 { EV_KEY, dev->repeat_key, 2 },
193 input_pass_values(dev, vals, ARRAY_SIZE(vals));
195 if (dev->rep[REP_PERIOD])
196 mod_timer(&dev->timer, jiffies +
197 msecs_to_jiffies(dev->rep[REP_PERIOD]));
200 spin_unlock_irqrestore(&dev->event_lock, flags);
203 #define INPUT_IGNORE_EVENT 0
204 #define INPUT_PASS_TO_HANDLERS 1
205 #define INPUT_PASS_TO_DEVICE 2
207 #define INPUT_FLUSH 8
208 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
210 static int input_handle_abs_event(struct input_dev *dev,
211 unsigned int code, int *pval)
213 struct input_mt *mt = dev->mt;
217 if (code == ABS_MT_SLOT) {
219 * "Stage" the event; we'll flush it later, when we
220 * get actual touch data.
222 if (mt && *pval >= 0 && *pval < mt->num_slots)
225 return INPUT_IGNORE_EVENT;
228 is_mt_event = input_is_mt_value(code);
231 pold = &dev->absinfo[code].value;
233 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
236 * Bypass filtering for multi-touch events when
237 * not employing slots.
243 *pval = input_defuzz_abs_event(*pval, *pold,
244 dev->absinfo[code].fuzz);
246 return INPUT_IGNORE_EVENT;
251 /* Flush pending "slot" event */
252 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
253 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
254 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
257 return INPUT_PASS_TO_HANDLERS;
260 static int input_get_disposition(struct input_dev *dev,
261 unsigned int type, unsigned int code, int *pval)
263 int disposition = INPUT_IGNORE_EVENT;
271 disposition = INPUT_PASS_TO_ALL;
275 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
278 disposition = INPUT_PASS_TO_HANDLERS;
284 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
286 /* auto-repeat bypasses state updates */
288 disposition = INPUT_PASS_TO_HANDLERS;
292 if (!!test_bit(code, dev->key) != !!value) {
294 __change_bit(code, dev->key);
295 disposition = INPUT_PASS_TO_HANDLERS;
301 if (is_event_supported(code, dev->swbit, SW_MAX) &&
302 !!test_bit(code, dev->sw) != !!value) {
304 __change_bit(code, dev->sw);
305 disposition = INPUT_PASS_TO_HANDLERS;
310 if (is_event_supported(code, dev->absbit, ABS_MAX))
311 disposition = input_handle_abs_event(dev, code, &value);
316 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
317 disposition = INPUT_PASS_TO_HANDLERS;
322 if (is_event_supported(code, dev->mscbit, MSC_MAX))
323 disposition = INPUT_PASS_TO_ALL;
328 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
329 !!test_bit(code, dev->led) != !!value) {
331 __change_bit(code, dev->led);
332 disposition = INPUT_PASS_TO_ALL;
337 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
339 if (!!test_bit(code, dev->snd) != !!value)
340 __change_bit(code, dev->snd);
341 disposition = INPUT_PASS_TO_ALL;
346 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
347 dev->rep[code] = value;
348 disposition = INPUT_PASS_TO_ALL;
354 disposition = INPUT_PASS_TO_ALL;
358 disposition = INPUT_PASS_TO_ALL;
366 static void input_handle_event(struct input_dev *dev,
367 unsigned int type, unsigned int code, int value)
369 int disposition = input_get_disposition(dev, type, code, &value);
371 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
372 add_input_randomness(type, code, value);
374 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
375 dev->event(dev, type, code, value);
380 if (disposition & INPUT_PASS_TO_HANDLERS) {
381 struct input_value *v;
383 if (disposition & INPUT_SLOT) {
384 v = &dev->vals[dev->num_vals++];
386 v->code = ABS_MT_SLOT;
387 v->value = dev->mt->slot;
390 v = &dev->vals[dev->num_vals++];
396 if (disposition & INPUT_FLUSH) {
397 if (dev->num_vals >= 2)
398 input_pass_values(dev, dev->vals, dev->num_vals);
401 * Reset the timestamp on flush so we won't end up
402 * with a stale one. Note we only need to reset the
403 * monolithic one as we use its presence when deciding
404 * whether to generate a synthetic timestamp.
406 dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);
407 } else if (dev->num_vals >= dev->max_vals - 2) {
408 dev->vals[dev->num_vals++] = input_value_sync;
409 input_pass_values(dev, dev->vals, dev->num_vals);
416 * input_event() - report new input event
417 * @dev: device that generated the event
418 * @type: type of the event
420 * @value: value of the event
422 * This function should be used by drivers implementing various input
423 * devices to report input events. See also input_inject_event().
425 * NOTE: input_event() may be safely used right after input device was
426 * allocated with input_allocate_device(), even before it is registered
427 * with input_register_device(), but the event will not reach any of the
428 * input handlers. Such early invocation of input_event() may be used
429 * to 'seed' initial state of a switch or initial position of absolute
432 void input_event(struct input_dev *dev,
433 unsigned int type, unsigned int code, int value)
437 if (is_event_supported(type, dev->evbit, EV_MAX)) {
439 spin_lock_irqsave(&dev->event_lock, flags);
440 input_handle_event(dev, type, code, value);
441 spin_unlock_irqrestore(&dev->event_lock, flags);
444 EXPORT_SYMBOL(input_event);
447 * input_inject_event() - send input event from input handler
448 * @handle: input handle to send event through
449 * @type: type of the event
451 * @value: value of the event
453 * Similar to input_event() but will ignore event if device is
454 * "grabbed" and handle injecting event is not the one that owns
457 void input_inject_event(struct input_handle *handle,
458 unsigned int type, unsigned int code, int value)
460 struct input_dev *dev = handle->dev;
461 struct input_handle *grab;
464 if (is_event_supported(type, dev->evbit, EV_MAX)) {
465 spin_lock_irqsave(&dev->event_lock, flags);
468 grab = rcu_dereference(dev->grab);
469 if (!grab || grab == handle)
470 input_handle_event(dev, type, code, value);
473 spin_unlock_irqrestore(&dev->event_lock, flags);
476 EXPORT_SYMBOL(input_inject_event);
479 * input_alloc_absinfo - allocates array of input_absinfo structs
480 * @dev: the input device emitting absolute events
482 * If the absinfo struct the caller asked for is already allocated, this
483 * functions will not do anything.
485 void input_alloc_absinfo(struct input_dev *dev)
490 dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);
492 dev_err(dev->dev.parent ?: &dev->dev,
493 "%s: unable to allocate memory\n", __func__);
495 * We will handle this allocation failure in
496 * input_register_device() when we refuse to register input
497 * device with ABS bits but without absinfo.
501 EXPORT_SYMBOL(input_alloc_absinfo);
503 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
504 int min, int max, int fuzz, int flat)
506 struct input_absinfo *absinfo;
508 input_alloc_absinfo(dev);
512 absinfo = &dev->absinfo[axis];
513 absinfo->minimum = min;
514 absinfo->maximum = max;
515 absinfo->fuzz = fuzz;
516 absinfo->flat = flat;
518 __set_bit(EV_ABS, dev->evbit);
519 __set_bit(axis, dev->absbit);
521 EXPORT_SYMBOL(input_set_abs_params);
525 * input_grab_device - grabs device for exclusive use
526 * @handle: input handle that wants to own the device
528 * When a device is grabbed by an input handle all events generated by
529 * the device are delivered only to this handle. Also events injected
530 * by other input handles are ignored while device is grabbed.
532 int input_grab_device(struct input_handle *handle)
534 struct input_dev *dev = handle->dev;
537 retval = mutex_lock_interruptible(&dev->mutex);
546 rcu_assign_pointer(dev->grab, handle);
549 mutex_unlock(&dev->mutex);
552 EXPORT_SYMBOL(input_grab_device);
554 static void __input_release_device(struct input_handle *handle)
556 struct input_dev *dev = handle->dev;
557 struct input_handle *grabber;
559 grabber = rcu_dereference_protected(dev->grab,
560 lockdep_is_held(&dev->mutex));
561 if (grabber == handle) {
562 rcu_assign_pointer(dev->grab, NULL);
563 /* Make sure input_pass_event() notices that grab is gone */
566 list_for_each_entry(handle, &dev->h_list, d_node)
567 if (handle->open && handle->handler->start)
568 handle->handler->start(handle);
573 * input_release_device - release previously grabbed device
574 * @handle: input handle that owns the device
576 * Releases previously grabbed device so that other input handles can
577 * start receiving input events. Upon release all handlers attached
578 * to the device have their start() method called so they have a change
579 * to synchronize device state with the rest of the system.
581 void input_release_device(struct input_handle *handle)
583 struct input_dev *dev = handle->dev;
585 mutex_lock(&dev->mutex);
586 __input_release_device(handle);
587 mutex_unlock(&dev->mutex);
589 EXPORT_SYMBOL(input_release_device);
592 * input_open_device - open input device
593 * @handle: handle through which device is being accessed
595 * This function should be called by input handlers when they
596 * want to start receive events from given input device.
598 int input_open_device(struct input_handle *handle)
600 struct input_dev *dev = handle->dev;
603 retval = mutex_lock_interruptible(&dev->mutex);
607 if (dev->going_away) {
616 * Device is already opened, so we can exit immediately and
623 retval = dev->open(dev);
628 * Make sure we are not delivering any more events
629 * through this handle
637 input_dev_poller_start(dev->poller);
640 mutex_unlock(&dev->mutex);
643 EXPORT_SYMBOL(input_open_device);
645 int input_flush_device(struct input_handle *handle, struct file *file)
647 struct input_dev *dev = handle->dev;
650 retval = mutex_lock_interruptible(&dev->mutex);
655 retval = dev->flush(dev, file);
657 mutex_unlock(&dev->mutex);
660 EXPORT_SYMBOL(input_flush_device);
663 * input_close_device - close input device
664 * @handle: handle through which device is being accessed
666 * This function should be called by input handlers when they
667 * want to stop receive events from given input device.
669 void input_close_device(struct input_handle *handle)
671 struct input_dev *dev = handle->dev;
673 mutex_lock(&dev->mutex);
675 __input_release_device(handle);
679 input_dev_poller_stop(dev->poller);
685 if (!--handle->open) {
687 * synchronize_rcu() makes sure that input_pass_event()
688 * completed and that no more input events are delivered
689 * through this handle
694 mutex_unlock(&dev->mutex);
696 EXPORT_SYMBOL(input_close_device);
699 * Simulate keyup events for all keys that are marked as pressed.
700 * The function must be called with dev->event_lock held.
702 static void input_dev_release_keys(struct input_dev *dev)
704 bool need_sync = false;
707 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
708 for_each_set_bit(code, dev->key, KEY_CNT) {
709 input_pass_event(dev, EV_KEY, code, 0);
714 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
716 memset(dev->key, 0, sizeof(dev->key));
721 * Prepare device for unregistering
723 static void input_disconnect_device(struct input_dev *dev)
725 struct input_handle *handle;
728 * Mark device as going away. Note that we take dev->mutex here
729 * not to protect access to dev->going_away but rather to ensure
730 * that there are no threads in the middle of input_open_device()
732 mutex_lock(&dev->mutex);
733 dev->going_away = true;
734 mutex_unlock(&dev->mutex);
736 spin_lock_irq(&dev->event_lock);
739 * Simulate keyup events for all pressed keys so that handlers
740 * are not left with "stuck" keys. The driver may continue
741 * generate events even after we done here but they will not
742 * reach any handlers.
744 input_dev_release_keys(dev);
746 list_for_each_entry(handle, &dev->h_list, d_node)
749 spin_unlock_irq(&dev->event_lock);
753 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
754 * @ke: keymap entry containing scancode to be converted.
755 * @scancode: pointer to the location where converted scancode should
758 * This function is used to convert scancode stored in &struct keymap_entry
759 * into scalar form understood by legacy keymap handling methods. These
760 * methods expect scancodes to be represented as 'unsigned int'.
762 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
763 unsigned int *scancode)
767 *scancode = *((u8 *)ke->scancode);
771 *scancode = *((u16 *)ke->scancode);
775 *scancode = *((u32 *)ke->scancode);
784 EXPORT_SYMBOL(input_scancode_to_scalar);
787 * Those routines handle the default case where no [gs]etkeycode() is
788 * defined. In this case, an array indexed by the scancode is used.
791 static unsigned int input_fetch_keycode(struct input_dev *dev,
794 switch (dev->keycodesize) {
796 return ((u8 *)dev->keycode)[index];
799 return ((u16 *)dev->keycode)[index];
802 return ((u32 *)dev->keycode)[index];
806 static int input_default_getkeycode(struct input_dev *dev,
807 struct input_keymap_entry *ke)
812 if (!dev->keycodesize)
815 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
818 error = input_scancode_to_scalar(ke, &index);
823 if (index >= dev->keycodemax)
826 ke->keycode = input_fetch_keycode(dev, index);
828 ke->len = sizeof(index);
829 memcpy(ke->scancode, &index, sizeof(index));
834 static int input_default_setkeycode(struct input_dev *dev,
835 const struct input_keymap_entry *ke,
836 unsigned int *old_keycode)
842 if (!dev->keycodesize)
845 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
848 error = input_scancode_to_scalar(ke, &index);
853 if (index >= dev->keycodemax)
856 if (dev->keycodesize < sizeof(ke->keycode) &&
857 (ke->keycode >> (dev->keycodesize * 8)))
860 switch (dev->keycodesize) {
862 u8 *k = (u8 *)dev->keycode;
863 *old_keycode = k[index];
864 k[index] = ke->keycode;
868 u16 *k = (u16 *)dev->keycode;
869 *old_keycode = k[index];
870 k[index] = ke->keycode;
874 u32 *k = (u32 *)dev->keycode;
875 *old_keycode = k[index];
876 k[index] = ke->keycode;
881 if (*old_keycode <= KEY_MAX) {
882 __clear_bit(*old_keycode, dev->keybit);
883 for (i = 0; i < dev->keycodemax; i++) {
884 if (input_fetch_keycode(dev, i) == *old_keycode) {
885 __set_bit(*old_keycode, dev->keybit);
886 /* Setting the bit twice is useless, so break */
892 __set_bit(ke->keycode, dev->keybit);
897 * input_get_keycode - retrieve keycode currently mapped to a given scancode
898 * @dev: input device which keymap is being queried
901 * This function should be called by anyone interested in retrieving current
902 * keymap. Presently evdev handlers use it.
904 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
909 spin_lock_irqsave(&dev->event_lock, flags);
910 retval = dev->getkeycode(dev, ke);
911 spin_unlock_irqrestore(&dev->event_lock, flags);
915 EXPORT_SYMBOL(input_get_keycode);
918 * input_set_keycode - attribute a keycode to a given scancode
919 * @dev: input device which keymap is being updated
920 * @ke: new keymap entry
922 * This function should be called by anyone needing to update current
923 * keymap. Presently keyboard and evdev handlers use it.
925 int input_set_keycode(struct input_dev *dev,
926 const struct input_keymap_entry *ke)
929 unsigned int old_keycode;
932 if (ke->keycode > KEY_MAX)
935 spin_lock_irqsave(&dev->event_lock, flags);
937 retval = dev->setkeycode(dev, ke, &old_keycode);
941 /* Make sure KEY_RESERVED did not get enabled. */
942 __clear_bit(KEY_RESERVED, dev->keybit);
945 * Simulate keyup event if keycode is not present
946 * in the keymap anymore
948 if (old_keycode > KEY_MAX) {
949 dev_warn(dev->dev.parent ?: &dev->dev,
950 "%s: got too big old keycode %#x\n",
951 __func__, old_keycode);
952 } else if (test_bit(EV_KEY, dev->evbit) &&
953 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
954 __test_and_clear_bit(old_keycode, dev->key)) {
955 struct input_value vals[] = {
956 { EV_KEY, old_keycode, 0 },
960 input_pass_values(dev, vals, ARRAY_SIZE(vals));
964 spin_unlock_irqrestore(&dev->event_lock, flags);
968 EXPORT_SYMBOL(input_set_keycode);
970 bool input_match_device_id(const struct input_dev *dev,
971 const struct input_device_id *id)
973 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
974 if (id->bustype != dev->id.bustype)
977 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
978 if (id->vendor != dev->id.vendor)
981 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
982 if (id->product != dev->id.product)
985 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
986 if (id->version != dev->id.version)
989 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
990 !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
991 !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
992 !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
993 !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
994 !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
995 !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
996 !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
997 !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
998 !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
1004 EXPORT_SYMBOL(input_match_device_id);
1006 static const struct input_device_id *input_match_device(struct input_handler *handler,
1007 struct input_dev *dev)
1009 const struct input_device_id *id;
1011 for (id = handler->id_table; id->flags || id->driver_info; id++) {
1012 if (input_match_device_id(dev, id) &&
1013 (!handler->match || handler->match(handler, dev))) {
1021 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
1023 const struct input_device_id *id;
1026 id = input_match_device(handler, dev);
1030 error = handler->connect(handler, dev, id);
1031 if (error && error != -ENODEV)
1032 pr_err("failed to attach handler %s to device %s, error: %d\n",
1033 handler->name, kobject_name(&dev->dev.kobj), error);
1038 #ifdef CONFIG_COMPAT
1040 static int input_bits_to_string(char *buf, int buf_size,
1041 unsigned long bits, bool skip_empty)
1045 if (in_compat_syscall()) {
1046 u32 dword = bits >> 32;
1047 if (dword || !skip_empty)
1048 len += snprintf(buf, buf_size, "%x ", dword);
1050 dword = bits & 0xffffffffUL;
1051 if (dword || !skip_empty || len)
1052 len += snprintf(buf + len, max(buf_size - len, 0),
1055 if (bits || !skip_empty)
1056 len += snprintf(buf, buf_size, "%lx", bits);
1062 #else /* !CONFIG_COMPAT */
1064 static int input_bits_to_string(char *buf, int buf_size,
1065 unsigned long bits, bool skip_empty)
1067 return bits || !skip_empty ?
1068 snprintf(buf, buf_size, "%lx", bits) : 0;
1073 #ifdef CONFIG_PROC_FS
1075 static struct proc_dir_entry *proc_bus_input_dir;
1076 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1077 static int input_devices_state;
1079 static inline void input_wakeup_procfs_readers(void)
1081 input_devices_state++;
1082 wake_up(&input_devices_poll_wait);
1085 static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait)
1087 poll_wait(file, &input_devices_poll_wait, wait);
1088 if (file->f_version != input_devices_state) {
1089 file->f_version = input_devices_state;
1090 return EPOLLIN | EPOLLRDNORM;
1096 union input_seq_state {
1099 bool mutex_acquired;
1104 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1106 union input_seq_state *state = (union input_seq_state *)&seq->private;
1109 /* We need to fit into seq->private pointer */
1110 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1112 error = mutex_lock_interruptible(&input_mutex);
1114 state->mutex_acquired = false;
1115 return ERR_PTR(error);
1118 state->mutex_acquired = true;
1120 return seq_list_start(&input_dev_list, *pos);
1123 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1125 return seq_list_next(v, &input_dev_list, pos);
1128 static void input_seq_stop(struct seq_file *seq, void *v)
1130 union input_seq_state *state = (union input_seq_state *)&seq->private;
1132 if (state->mutex_acquired)
1133 mutex_unlock(&input_mutex);
1136 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1137 unsigned long *bitmap, int max)
1140 bool skip_empty = true;
1143 seq_printf(seq, "B: %s=", name);
1145 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1146 if (input_bits_to_string(buf, sizeof(buf),
1147 bitmap[i], skip_empty)) {
1149 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1154 * If no output was produced print a single 0.
1159 seq_putc(seq, '\n');
1162 static int input_devices_seq_show(struct seq_file *seq, void *v)
1164 struct input_dev *dev = container_of(v, struct input_dev, node);
1165 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1166 struct input_handle *handle;
1168 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1169 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1171 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1172 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1173 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1174 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1175 seq_puts(seq, "H: Handlers=");
1177 list_for_each_entry(handle, &dev->h_list, d_node)
1178 seq_printf(seq, "%s ", handle->name);
1179 seq_putc(seq, '\n');
1181 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1183 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1184 if (test_bit(EV_KEY, dev->evbit))
1185 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1186 if (test_bit(EV_REL, dev->evbit))
1187 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1188 if (test_bit(EV_ABS, dev->evbit))
1189 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1190 if (test_bit(EV_MSC, dev->evbit))
1191 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1192 if (test_bit(EV_LED, dev->evbit))
1193 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1194 if (test_bit(EV_SND, dev->evbit))
1195 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1196 if (test_bit(EV_FF, dev->evbit))
1197 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1198 if (test_bit(EV_SW, dev->evbit))
1199 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1201 seq_putc(seq, '\n');
1207 static const struct seq_operations input_devices_seq_ops = {
1208 .start = input_devices_seq_start,
1209 .next = input_devices_seq_next,
1210 .stop = input_seq_stop,
1211 .show = input_devices_seq_show,
1214 static int input_proc_devices_open(struct inode *inode, struct file *file)
1216 return seq_open(file, &input_devices_seq_ops);
1219 static const struct file_operations input_devices_fileops = {
1220 .owner = THIS_MODULE,
1221 .open = input_proc_devices_open,
1222 .poll = input_proc_devices_poll,
1224 .llseek = seq_lseek,
1225 .release = seq_release,
1228 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1230 union input_seq_state *state = (union input_seq_state *)&seq->private;
1233 /* We need to fit into seq->private pointer */
1234 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1236 error = mutex_lock_interruptible(&input_mutex);
1238 state->mutex_acquired = false;
1239 return ERR_PTR(error);
1242 state->mutex_acquired = true;
1245 return seq_list_start(&input_handler_list, *pos);
1248 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1250 union input_seq_state *state = (union input_seq_state *)&seq->private;
1252 state->pos = *pos + 1;
1253 return seq_list_next(v, &input_handler_list, pos);
1256 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1258 struct input_handler *handler = container_of(v, struct input_handler, node);
1259 union input_seq_state *state = (union input_seq_state *)&seq->private;
1261 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1262 if (handler->filter)
1263 seq_puts(seq, " (filter)");
1264 if (handler->legacy_minors)
1265 seq_printf(seq, " Minor=%d", handler->minor);
1266 seq_putc(seq, '\n');
1271 static const struct seq_operations input_handlers_seq_ops = {
1272 .start = input_handlers_seq_start,
1273 .next = input_handlers_seq_next,
1274 .stop = input_seq_stop,
1275 .show = input_handlers_seq_show,
1278 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1280 return seq_open(file, &input_handlers_seq_ops);
1283 static const struct file_operations input_handlers_fileops = {
1284 .owner = THIS_MODULE,
1285 .open = input_proc_handlers_open,
1287 .llseek = seq_lseek,
1288 .release = seq_release,
1291 static int __init input_proc_init(void)
1293 struct proc_dir_entry *entry;
1295 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1296 if (!proc_bus_input_dir)
1299 entry = proc_create("devices", 0, proc_bus_input_dir,
1300 &input_devices_fileops);
1304 entry = proc_create("handlers", 0, proc_bus_input_dir,
1305 &input_handlers_fileops);
1311 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1312 fail1: remove_proc_entry("bus/input", NULL);
1316 static void input_proc_exit(void)
1318 remove_proc_entry("devices", proc_bus_input_dir);
1319 remove_proc_entry("handlers", proc_bus_input_dir);
1320 remove_proc_entry("bus/input", NULL);
1323 #else /* !CONFIG_PROC_FS */
1324 static inline void input_wakeup_procfs_readers(void) { }
1325 static inline int input_proc_init(void) { return 0; }
1326 static inline void input_proc_exit(void) { }
1329 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1330 static ssize_t input_dev_show_##name(struct device *dev, \
1331 struct device_attribute *attr, \
1334 struct input_dev *input_dev = to_input_dev(dev); \
1336 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1337 input_dev->name ? input_dev->name : ""); \
1339 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1341 INPUT_DEV_STRING_ATTR_SHOW(name);
1342 INPUT_DEV_STRING_ATTR_SHOW(phys);
1343 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1345 static int input_print_modalias_bits(char *buf, int size,
1346 char name, unsigned long *bm,
1347 unsigned int min_bit, unsigned int max_bit)
1351 len += snprintf(buf, max(size, 0), "%c", name);
1352 for (i = min_bit; i < max_bit; i++)
1353 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1354 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1358 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1363 len = snprintf(buf, max(size, 0),
1364 "input:b%04Xv%04Xp%04Xe%04X-",
1365 id->id.bustype, id->id.vendor,
1366 id->id.product, id->id.version);
1368 len += input_print_modalias_bits(buf + len, size - len,
1369 'e', id->evbit, 0, EV_MAX);
1370 len += input_print_modalias_bits(buf + len, size - len,
1371 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1372 len += input_print_modalias_bits(buf + len, size - len,
1373 'r', id->relbit, 0, REL_MAX);
1374 len += input_print_modalias_bits(buf + len, size - len,
1375 'a', id->absbit, 0, ABS_MAX);
1376 len += input_print_modalias_bits(buf + len, size - len,
1377 'm', id->mscbit, 0, MSC_MAX);
1378 len += input_print_modalias_bits(buf + len, size - len,
1379 'l', id->ledbit, 0, LED_MAX);
1380 len += input_print_modalias_bits(buf + len, size - len,
1381 's', id->sndbit, 0, SND_MAX);
1382 len += input_print_modalias_bits(buf + len, size - len,
1383 'f', id->ffbit, 0, FF_MAX);
1384 len += input_print_modalias_bits(buf + len, size - len,
1385 'w', id->swbit, 0, SW_MAX);
1388 len += snprintf(buf + len, max(size - len, 0), "\n");
1393 static ssize_t input_dev_show_modalias(struct device *dev,
1394 struct device_attribute *attr,
1397 struct input_dev *id = to_input_dev(dev);
1400 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1402 return min_t(int, len, PAGE_SIZE);
1404 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1406 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1407 int max, int add_cr);
1409 static ssize_t input_dev_show_properties(struct device *dev,
1410 struct device_attribute *attr,
1413 struct input_dev *input_dev = to_input_dev(dev);
1414 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1415 INPUT_PROP_MAX, true);
1416 return min_t(int, len, PAGE_SIZE);
1418 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1420 static struct attribute *input_dev_attrs[] = {
1421 &dev_attr_name.attr,
1422 &dev_attr_phys.attr,
1423 &dev_attr_uniq.attr,
1424 &dev_attr_modalias.attr,
1425 &dev_attr_properties.attr,
1429 static const struct attribute_group input_dev_attr_group = {
1430 .attrs = input_dev_attrs,
1433 #define INPUT_DEV_ID_ATTR(name) \
1434 static ssize_t input_dev_show_id_##name(struct device *dev, \
1435 struct device_attribute *attr, \
1438 struct input_dev *input_dev = to_input_dev(dev); \
1439 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1441 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1443 INPUT_DEV_ID_ATTR(bustype);
1444 INPUT_DEV_ID_ATTR(vendor);
1445 INPUT_DEV_ID_ATTR(product);
1446 INPUT_DEV_ID_ATTR(version);
1448 static struct attribute *input_dev_id_attrs[] = {
1449 &dev_attr_bustype.attr,
1450 &dev_attr_vendor.attr,
1451 &dev_attr_product.attr,
1452 &dev_attr_version.attr,
1456 static const struct attribute_group input_dev_id_attr_group = {
1458 .attrs = input_dev_id_attrs,
1461 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1462 int max, int add_cr)
1466 bool skip_empty = true;
1468 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1469 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1470 bitmap[i], skip_empty);
1474 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1479 * If no output was produced print a single 0.
1482 len = snprintf(buf, buf_size, "%d", 0);
1485 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1490 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1491 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1492 struct device_attribute *attr, \
1495 struct input_dev *input_dev = to_input_dev(dev); \
1496 int len = input_print_bitmap(buf, PAGE_SIZE, \
1497 input_dev->bm##bit, ev##_MAX, \
1499 return min_t(int, len, PAGE_SIZE); \
1501 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1503 INPUT_DEV_CAP_ATTR(EV, ev);
1504 INPUT_DEV_CAP_ATTR(KEY, key);
1505 INPUT_DEV_CAP_ATTR(REL, rel);
1506 INPUT_DEV_CAP_ATTR(ABS, abs);
1507 INPUT_DEV_CAP_ATTR(MSC, msc);
1508 INPUT_DEV_CAP_ATTR(LED, led);
1509 INPUT_DEV_CAP_ATTR(SND, snd);
1510 INPUT_DEV_CAP_ATTR(FF, ff);
1511 INPUT_DEV_CAP_ATTR(SW, sw);
1513 static struct attribute *input_dev_caps_attrs[] = {
1526 static const struct attribute_group input_dev_caps_attr_group = {
1527 .name = "capabilities",
1528 .attrs = input_dev_caps_attrs,
1531 static const struct attribute_group *input_dev_attr_groups[] = {
1532 &input_dev_attr_group,
1533 &input_dev_id_attr_group,
1534 &input_dev_caps_attr_group,
1535 &input_poller_attribute_group,
1539 static void input_dev_release(struct device *device)
1541 struct input_dev *dev = to_input_dev(device);
1543 input_ff_destroy(dev);
1544 input_mt_destroy_slots(dev);
1546 kfree(dev->absinfo);
1550 module_put(THIS_MODULE);
1554 * Input uevent interface - loading event handlers based on
1557 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1558 const char *name, unsigned long *bitmap, int max)
1562 if (add_uevent_var(env, "%s", name))
1565 len = input_print_bitmap(&env->buf[env->buflen - 1],
1566 sizeof(env->buf) - env->buflen,
1567 bitmap, max, false);
1568 if (len >= (sizeof(env->buf) - env->buflen))
1575 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1576 struct input_dev *dev)
1580 if (add_uevent_var(env, "MODALIAS="))
1583 len = input_print_modalias(&env->buf[env->buflen - 1],
1584 sizeof(env->buf) - env->buflen,
1586 if (len >= (sizeof(env->buf) - env->buflen))
1593 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1595 int err = add_uevent_var(env, fmt, val); \
1600 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1602 int err = input_add_uevent_bm_var(env, name, bm, max); \
1607 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1609 int err = input_add_uevent_modalias_var(env, dev); \
1614 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1616 struct input_dev *dev = to_input_dev(device);
1618 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1619 dev->id.bustype, dev->id.vendor,
1620 dev->id.product, dev->id.version);
1622 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1624 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1626 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1628 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1630 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1631 if (test_bit(EV_KEY, dev->evbit))
1632 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1633 if (test_bit(EV_REL, dev->evbit))
1634 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1635 if (test_bit(EV_ABS, dev->evbit))
1636 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1637 if (test_bit(EV_MSC, dev->evbit))
1638 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1639 if (test_bit(EV_LED, dev->evbit))
1640 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1641 if (test_bit(EV_SND, dev->evbit))
1642 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1643 if (test_bit(EV_FF, dev->evbit))
1644 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1645 if (test_bit(EV_SW, dev->evbit))
1646 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1648 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1653 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1658 if (!test_bit(EV_##type, dev->evbit)) \
1661 for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
1662 active = test_bit(i, dev->bits); \
1663 if (!active && !on) \
1666 dev->event(dev, EV_##type, i, on ? active : 0); \
1670 static void input_dev_toggle(struct input_dev *dev, bool activate)
1675 INPUT_DO_TOGGLE(dev, LED, led, activate);
1676 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1678 if (activate && test_bit(EV_REP, dev->evbit)) {
1679 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1680 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1685 * input_reset_device() - reset/restore the state of input device
1686 * @dev: input device whose state needs to be reset
1688 * This function tries to reset the state of an opened input device and
1689 * bring internal state and state if the hardware in sync with each other.
1690 * We mark all keys as released, restore LED state, repeat rate, etc.
1692 void input_reset_device(struct input_dev *dev)
1694 unsigned long flags;
1696 mutex_lock(&dev->mutex);
1697 spin_lock_irqsave(&dev->event_lock, flags);
1699 input_dev_toggle(dev, true);
1700 input_dev_release_keys(dev);
1702 spin_unlock_irqrestore(&dev->event_lock, flags);
1703 mutex_unlock(&dev->mutex);
1705 EXPORT_SYMBOL(input_reset_device);
1707 #ifdef CONFIG_PM_SLEEP
1708 static int input_dev_suspend(struct device *dev)
1710 struct input_dev *input_dev = to_input_dev(dev);
1712 spin_lock_irq(&input_dev->event_lock);
1715 * Keys that are pressed now are unlikely to be
1716 * still pressed when we resume.
1718 input_dev_release_keys(input_dev);
1720 /* Turn off LEDs and sounds, if any are active. */
1721 input_dev_toggle(input_dev, false);
1723 spin_unlock_irq(&input_dev->event_lock);
1728 static int input_dev_resume(struct device *dev)
1730 struct input_dev *input_dev = to_input_dev(dev);
1732 spin_lock_irq(&input_dev->event_lock);
1734 /* Restore state of LEDs and sounds, if any were active. */
1735 input_dev_toggle(input_dev, true);
1737 spin_unlock_irq(&input_dev->event_lock);
1742 static int input_dev_freeze(struct device *dev)
1744 struct input_dev *input_dev = to_input_dev(dev);
1746 spin_lock_irq(&input_dev->event_lock);
1749 * Keys that are pressed now are unlikely to be
1750 * still pressed when we resume.
1752 input_dev_release_keys(input_dev);
1754 spin_unlock_irq(&input_dev->event_lock);
1759 static int input_dev_poweroff(struct device *dev)
1761 struct input_dev *input_dev = to_input_dev(dev);
1763 spin_lock_irq(&input_dev->event_lock);
1765 /* Turn off LEDs and sounds, if any are active. */
1766 input_dev_toggle(input_dev, false);
1768 spin_unlock_irq(&input_dev->event_lock);
1773 static const struct dev_pm_ops input_dev_pm_ops = {
1774 .suspend = input_dev_suspend,
1775 .resume = input_dev_resume,
1776 .freeze = input_dev_freeze,
1777 .poweroff = input_dev_poweroff,
1778 .restore = input_dev_resume,
1780 #endif /* CONFIG_PM */
1782 static const struct device_type input_dev_type = {
1783 .groups = input_dev_attr_groups,
1784 .release = input_dev_release,
1785 .uevent = input_dev_uevent,
1786 #ifdef CONFIG_PM_SLEEP
1787 .pm = &input_dev_pm_ops,
1791 static char *input_devnode(struct device *dev, umode_t *mode)
1793 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1796 struct class input_class = {
1798 .devnode = input_devnode,
1800 EXPORT_SYMBOL_GPL(input_class);
1803 * input_allocate_device - allocate memory for new input device
1805 * Returns prepared struct input_dev or %NULL.
1807 * NOTE: Use input_free_device() to free devices that have not been
1808 * registered; input_unregister_device() should be used for already
1809 * registered devices.
1811 struct input_dev *input_allocate_device(void)
1813 static atomic_t input_no = ATOMIC_INIT(-1);
1814 struct input_dev *dev;
1816 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1818 dev->dev.type = &input_dev_type;
1819 dev->dev.class = &input_class;
1820 device_initialize(&dev->dev);
1821 mutex_init(&dev->mutex);
1822 spin_lock_init(&dev->event_lock);
1823 timer_setup(&dev->timer, NULL, 0);
1824 INIT_LIST_HEAD(&dev->h_list);
1825 INIT_LIST_HEAD(&dev->node);
1827 dev_set_name(&dev->dev, "input%lu",
1828 (unsigned long)atomic_inc_return(&input_no));
1830 __module_get(THIS_MODULE);
1835 EXPORT_SYMBOL(input_allocate_device);
1837 struct input_devres {
1838 struct input_dev *input;
1841 static int devm_input_device_match(struct device *dev, void *res, void *data)
1843 struct input_devres *devres = res;
1845 return devres->input == data;
1848 static void devm_input_device_release(struct device *dev, void *res)
1850 struct input_devres *devres = res;
1851 struct input_dev *input = devres->input;
1853 dev_dbg(dev, "%s: dropping reference to %s\n",
1854 __func__, dev_name(&input->dev));
1855 input_put_device(input);
1859 * devm_input_allocate_device - allocate managed input device
1860 * @dev: device owning the input device being created
1862 * Returns prepared struct input_dev or %NULL.
1864 * Managed input devices do not need to be explicitly unregistered or
1865 * freed as it will be done automatically when owner device unbinds from
1866 * its driver (or binding fails). Once managed input device is allocated,
1867 * it is ready to be set up and registered in the same fashion as regular
1868 * input device. There are no special devm_input_device_[un]register()
1869 * variants, regular ones work with both managed and unmanaged devices,
1870 * should you need them. In most cases however, managed input device need
1871 * not be explicitly unregistered or freed.
1873 * NOTE: the owner device is set up as parent of input device and users
1874 * should not override it.
1876 struct input_dev *devm_input_allocate_device(struct device *dev)
1878 struct input_dev *input;
1879 struct input_devres *devres;
1881 devres = devres_alloc(devm_input_device_release,
1882 sizeof(*devres), GFP_KERNEL);
1886 input = input_allocate_device();
1888 devres_free(devres);
1892 input->dev.parent = dev;
1893 input->devres_managed = true;
1895 devres->input = input;
1896 devres_add(dev, devres);
1900 EXPORT_SYMBOL(devm_input_allocate_device);
1903 * input_free_device - free memory occupied by input_dev structure
1904 * @dev: input device to free
1906 * This function should only be used if input_register_device()
1907 * was not called yet or if it failed. Once device was registered
1908 * use input_unregister_device() and memory will be freed once last
1909 * reference to the device is dropped.
1911 * Device should be allocated by input_allocate_device().
1913 * NOTE: If there are references to the input device then memory
1914 * will not be freed until last reference is dropped.
1916 void input_free_device(struct input_dev *dev)
1919 if (dev->devres_managed)
1920 WARN_ON(devres_destroy(dev->dev.parent,
1921 devm_input_device_release,
1922 devm_input_device_match,
1924 input_put_device(dev);
1927 EXPORT_SYMBOL(input_free_device);
1930 * input_set_timestamp - set timestamp for input events
1931 * @dev: input device to set timestamp for
1932 * @timestamp: the time at which the event has occurred
1933 * in CLOCK_MONOTONIC
1935 * This function is intended to provide to the input system a more
1936 * accurate time of when an event actually occurred. The driver should
1937 * call this function as soon as a timestamp is acquired ensuring
1938 * clock conversions in input_set_timestamp are done correctly.
1940 * The system entering suspend state between timestamp acquisition and
1941 * calling input_set_timestamp can result in inaccurate conversions.
1943 void input_set_timestamp(struct input_dev *dev, ktime_t timestamp)
1945 dev->timestamp[INPUT_CLK_MONO] = timestamp;
1946 dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);
1947 dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,
1950 EXPORT_SYMBOL(input_set_timestamp);
1953 * input_get_timestamp - get timestamp for input events
1954 * @dev: input device to get timestamp from
1956 * A valid timestamp is a timestamp of non-zero value.
1958 ktime_t *input_get_timestamp(struct input_dev *dev)
1960 const ktime_t invalid_timestamp = ktime_set(0, 0);
1962 if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))
1963 input_set_timestamp(dev, ktime_get());
1965 return dev->timestamp;
1967 EXPORT_SYMBOL(input_get_timestamp);
1970 * input_set_capability - mark device as capable of a certain event
1971 * @dev: device that is capable of emitting or accepting event
1972 * @type: type of the event (EV_KEY, EV_REL, etc...)
1975 * In addition to setting up corresponding bit in appropriate capability
1976 * bitmap the function also adjusts dev->evbit.
1978 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1982 __set_bit(code, dev->keybit);
1986 __set_bit(code, dev->relbit);
1990 input_alloc_absinfo(dev);
1994 __set_bit(code, dev->absbit);
1998 __set_bit(code, dev->mscbit);
2002 __set_bit(code, dev->swbit);
2006 __set_bit(code, dev->ledbit);
2010 __set_bit(code, dev->sndbit);
2014 __set_bit(code, dev->ffbit);
2022 pr_err("%s: unknown type %u (code %u)\n", __func__, type, code);
2027 __set_bit(type, dev->evbit);
2029 EXPORT_SYMBOL(input_set_capability);
2031 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
2035 unsigned int events;
2038 mt_slots = dev->mt->num_slots;
2039 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
2040 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
2041 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
2042 mt_slots = clamp(mt_slots, 2, 32);
2043 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
2049 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
2051 if (test_bit(EV_ABS, dev->evbit))
2052 for_each_set_bit(i, dev->absbit, ABS_CNT)
2053 events += input_is_mt_axis(i) ? mt_slots : 1;
2055 if (test_bit(EV_REL, dev->evbit))
2056 events += bitmap_weight(dev->relbit, REL_CNT);
2058 /* Make room for KEY and MSC events */
2064 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
2066 if (!test_bit(EV_##type, dev->evbit)) \
2067 memset(dev->bits##bit, 0, \
2068 sizeof(dev->bits##bit)); \
2071 static void input_cleanse_bitmasks(struct input_dev *dev)
2073 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2074 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2075 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2076 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2077 INPUT_CLEANSE_BITMASK(dev, LED, led);
2078 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2079 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2080 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2083 static void __input_unregister_device(struct input_dev *dev)
2085 struct input_handle *handle, *next;
2087 input_disconnect_device(dev);
2089 mutex_lock(&input_mutex);
2091 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2092 handle->handler->disconnect(handle);
2093 WARN_ON(!list_empty(&dev->h_list));
2095 del_timer_sync(&dev->timer);
2096 list_del_init(&dev->node);
2098 input_wakeup_procfs_readers();
2100 mutex_unlock(&input_mutex);
2102 device_del(&dev->dev);
2105 static void devm_input_device_unregister(struct device *dev, void *res)
2107 struct input_devres *devres = res;
2108 struct input_dev *input = devres->input;
2110 dev_dbg(dev, "%s: unregistering device %s\n",
2111 __func__, dev_name(&input->dev));
2112 __input_unregister_device(input);
2116 * input_enable_softrepeat - enable software autorepeat
2117 * @dev: input device
2118 * @delay: repeat delay
2119 * @period: repeat period
2121 * Enable software autorepeat on the input device.
2123 void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
2125 dev->timer.function = input_repeat_key;
2126 dev->rep[REP_DELAY] = delay;
2127 dev->rep[REP_PERIOD] = period;
2129 EXPORT_SYMBOL(input_enable_softrepeat);
2132 * input_register_device - register device with input core
2133 * @dev: device to be registered
2135 * This function registers device with input core. The device must be
2136 * allocated with input_allocate_device() and all it's capabilities
2137 * set up before registering.
2138 * If function fails the device must be freed with input_free_device().
2139 * Once device has been successfully registered it can be unregistered
2140 * with input_unregister_device(); input_free_device() should not be
2141 * called in this case.
2143 * Note that this function is also used to register managed input devices
2144 * (ones allocated with devm_input_allocate_device()). Such managed input
2145 * devices need not be explicitly unregistered or freed, their tear down
2146 * is controlled by the devres infrastructure. It is also worth noting
2147 * that tear down of managed input devices is internally a 2-step process:
2148 * registered managed input device is first unregistered, but stays in
2149 * memory and can still handle input_event() calls (although events will
2150 * not be delivered anywhere). The freeing of managed input device will
2151 * happen later, when devres stack is unwound to the point where device
2152 * allocation was made.
2154 int input_register_device(struct input_dev *dev)
2156 struct input_devres *devres = NULL;
2157 struct input_handler *handler;
2158 unsigned int packet_size;
2162 if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
2164 "Absolute device without dev->absinfo, refusing to register\n");
2168 if (dev->devres_managed) {
2169 devres = devres_alloc(devm_input_device_unregister,
2170 sizeof(*devres), GFP_KERNEL);
2174 devres->input = dev;
2177 /* Every input device generates EV_SYN/SYN_REPORT events. */
2178 __set_bit(EV_SYN, dev->evbit);
2180 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2181 __clear_bit(KEY_RESERVED, dev->keybit);
2183 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2184 input_cleanse_bitmasks(dev);
2186 packet_size = input_estimate_events_per_packet(dev);
2187 if (dev->hint_events_per_packet < packet_size)
2188 dev->hint_events_per_packet = packet_size;
2190 dev->max_vals = dev->hint_events_per_packet + 2;
2191 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2194 goto err_devres_free;
2198 * If delay and period are pre-set by the driver, then autorepeating
2199 * is handled by the driver itself and we don't do it in input.c.
2201 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
2202 input_enable_softrepeat(dev, 250, 33);
2204 if (!dev->getkeycode)
2205 dev->getkeycode = input_default_getkeycode;
2207 if (!dev->setkeycode)
2208 dev->setkeycode = input_default_setkeycode;
2211 input_dev_poller_finalize(dev->poller);
2213 error = device_add(&dev->dev);
2217 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2218 pr_info("%s as %s\n",
2219 dev->name ? dev->name : "Unspecified device",
2220 path ? path : "N/A");
2223 error = mutex_lock_interruptible(&input_mutex);
2225 goto err_device_del;
2227 list_add_tail(&dev->node, &input_dev_list);
2229 list_for_each_entry(handler, &input_handler_list, node)
2230 input_attach_handler(dev, handler);
2232 input_wakeup_procfs_readers();
2234 mutex_unlock(&input_mutex);
2236 if (dev->devres_managed) {
2237 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2238 __func__, dev_name(&dev->dev));
2239 devres_add(dev->dev.parent, devres);
2244 device_del(&dev->dev);
2249 devres_free(devres);
2252 EXPORT_SYMBOL(input_register_device);
2255 * input_unregister_device - unregister previously registered device
2256 * @dev: device to be unregistered
2258 * This function unregisters an input device. Once device is unregistered
2259 * the caller should not try to access it as it may get freed at any moment.
2261 void input_unregister_device(struct input_dev *dev)
2263 if (dev->devres_managed) {
2264 WARN_ON(devres_destroy(dev->dev.parent,
2265 devm_input_device_unregister,
2266 devm_input_device_match,
2268 __input_unregister_device(dev);
2270 * We do not do input_put_device() here because it will be done
2271 * when 2nd devres fires up.
2274 __input_unregister_device(dev);
2275 input_put_device(dev);
2278 EXPORT_SYMBOL(input_unregister_device);
2281 * input_register_handler - register a new input handler
2282 * @handler: handler to be registered
2284 * This function registers a new input handler (interface) for input
2285 * devices in the system and attaches it to all input devices that
2286 * are compatible with the handler.
2288 int input_register_handler(struct input_handler *handler)
2290 struct input_dev *dev;
2293 error = mutex_lock_interruptible(&input_mutex);
2297 INIT_LIST_HEAD(&handler->h_list);
2299 list_add_tail(&handler->node, &input_handler_list);
2301 list_for_each_entry(dev, &input_dev_list, node)
2302 input_attach_handler(dev, handler);
2304 input_wakeup_procfs_readers();
2306 mutex_unlock(&input_mutex);
2309 EXPORT_SYMBOL(input_register_handler);
2312 * input_unregister_handler - unregisters an input handler
2313 * @handler: handler to be unregistered
2315 * This function disconnects a handler from its input devices and
2316 * removes it from lists of known handlers.
2318 void input_unregister_handler(struct input_handler *handler)
2320 struct input_handle *handle, *next;
2322 mutex_lock(&input_mutex);
2324 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2325 handler->disconnect(handle);
2326 WARN_ON(!list_empty(&handler->h_list));
2328 list_del_init(&handler->node);
2330 input_wakeup_procfs_readers();
2332 mutex_unlock(&input_mutex);
2334 EXPORT_SYMBOL(input_unregister_handler);
2337 * input_handler_for_each_handle - handle iterator
2338 * @handler: input handler to iterate
2339 * @data: data for the callback
2340 * @fn: function to be called for each handle
2342 * Iterate over @bus's list of devices, and call @fn for each, passing
2343 * it @data and stop when @fn returns a non-zero value. The function is
2344 * using RCU to traverse the list and therefore may be using in atomic
2345 * contexts. The @fn callback is invoked from RCU critical section and
2346 * thus must not sleep.
2348 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2349 int (*fn)(struct input_handle *, void *))
2351 struct input_handle *handle;
2356 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2357 retval = fn(handle, data);
2366 EXPORT_SYMBOL(input_handler_for_each_handle);
2369 * input_register_handle - register a new input handle
2370 * @handle: handle to register
2372 * This function puts a new input handle onto device's
2373 * and handler's lists so that events can flow through
2374 * it once it is opened using input_open_device().
2376 * This function is supposed to be called from handler's
2379 int input_register_handle(struct input_handle *handle)
2381 struct input_handler *handler = handle->handler;
2382 struct input_dev *dev = handle->dev;
2386 * We take dev->mutex here to prevent race with
2387 * input_release_device().
2389 error = mutex_lock_interruptible(&dev->mutex);
2394 * Filters go to the head of the list, normal handlers
2397 if (handler->filter)
2398 list_add_rcu(&handle->d_node, &dev->h_list);
2400 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2402 mutex_unlock(&dev->mutex);
2405 * Since we are supposed to be called from ->connect()
2406 * which is mutually exclusive with ->disconnect()
2407 * we can't be racing with input_unregister_handle()
2408 * and so separate lock is not needed here.
2410 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2413 handler->start(handle);
2417 EXPORT_SYMBOL(input_register_handle);
2420 * input_unregister_handle - unregister an input handle
2421 * @handle: handle to unregister
2423 * This function removes input handle from device's
2424 * and handler's lists.
2426 * This function is supposed to be called from handler's
2427 * disconnect() method.
2429 void input_unregister_handle(struct input_handle *handle)
2431 struct input_dev *dev = handle->dev;
2433 list_del_rcu(&handle->h_node);
2436 * Take dev->mutex to prevent race with input_release_device().
2438 mutex_lock(&dev->mutex);
2439 list_del_rcu(&handle->d_node);
2440 mutex_unlock(&dev->mutex);
2444 EXPORT_SYMBOL(input_unregister_handle);
2447 * input_get_new_minor - allocates a new input minor number
2448 * @legacy_base: beginning or the legacy range to be searched
2449 * @legacy_num: size of legacy range
2450 * @allow_dynamic: whether we can also take ID from the dynamic range
2452 * This function allocates a new device minor for from input major namespace.
2453 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2454 * parameters and whether ID can be allocated from dynamic range if there are
2455 * no free IDs in legacy range.
2457 int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2461 * This function should be called from input handler's ->connect()
2462 * methods, which are serialized with input_mutex, so no additional
2463 * locking is needed here.
2465 if (legacy_base >= 0) {
2466 int minor = ida_simple_get(&input_ida,
2468 legacy_base + legacy_num,
2470 if (minor >= 0 || !allow_dynamic)
2474 return ida_simple_get(&input_ida,
2475 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2478 EXPORT_SYMBOL(input_get_new_minor);
2481 * input_free_minor - release previously allocated minor
2482 * @minor: minor to be released
2484 * This function releases previously allocated input minor so that it can be
2487 void input_free_minor(unsigned int minor)
2489 ida_simple_remove(&input_ida, minor);
2491 EXPORT_SYMBOL(input_free_minor);
2493 static int __init input_init(void)
2497 err = class_register(&input_class);
2499 pr_err("unable to register input_dev class\n");
2503 err = input_proc_init();
2507 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2508 INPUT_MAX_CHAR_DEVICES, "input");
2510 pr_err("unable to register char major %d", INPUT_MAJOR);
2516 fail2: input_proc_exit();
2517 fail1: class_unregister(&input_class);
2521 static void __exit input_exit(void)
2524 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2525 INPUT_MAX_CHAR_DEVICES);
2526 class_unregister(&input_class);
2529 subsys_initcall(input_init);
2530 module_exit(input_exit);