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/idr.h>
18 #include <linux/input/mt.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/random.h>
22 #include <linux/major.h>
23 #include <linux/proc_fs.h>
24 #include <linux/sched.h>
25 #include <linux/seq_file.h>
26 #include <linux/poll.h>
27 #include <linux/device.h>
28 #include <linux/mutex.h>
29 #include <linux/rcupdate.h>
30 #include "input-compat.h"
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
33 MODULE_DESCRIPTION("Input core");
34 MODULE_LICENSE("GPL");
36 #define INPUT_MAX_CHAR_DEVICES 1024
37 #define INPUT_FIRST_DYNAMIC_DEV 256
38 static DEFINE_IDA(input_ida);
40 static LIST_HEAD(input_dev_list);
41 static LIST_HEAD(input_handler_list);
44 * input_mutex protects access to both input_dev_list and input_handler_list.
45 * This also causes input_[un]register_device and input_[un]register_handler
46 * be mutually exclusive which simplifies locking in drivers implementing
49 static DEFINE_MUTEX(input_mutex);
51 static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
53 static inline int is_event_supported(unsigned int code,
54 unsigned long *bm, unsigned int max)
56 return code <= max && test_bit(code, bm);
59 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
62 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
65 if (value > old_val - fuzz && value < old_val + fuzz)
66 return (old_val * 3 + value) / 4;
68 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
69 return (old_val + value) / 2;
75 static void input_start_autorepeat(struct input_dev *dev, int code)
77 if (test_bit(EV_REP, dev->evbit) &&
78 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
80 dev->repeat_key = code;
81 mod_timer(&dev->timer,
82 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
86 static void input_stop_autorepeat(struct input_dev *dev)
88 del_timer(&dev->timer);
92 * Pass event first through all filters and then, if event has not been
93 * filtered out, through all open handles. This function is called with
94 * dev->event_lock held and interrupts disabled.
96 static unsigned int input_to_handler(struct input_handle *handle,
97 struct input_value *vals, unsigned int count)
99 struct input_handler *handler = handle->handler;
100 struct input_value *end = vals;
101 struct input_value *v;
103 if (handler->filter) {
104 for (v = vals; v != vals + count; v++) {
105 if (handler->filter(handle, v->type, v->code, v->value))
118 handler->events(handle, vals, count);
119 else if (handler->event)
120 for (v = vals; v != vals + count; v++)
121 handler->event(handle, v->type, v->code, v->value);
127 * Pass values first through all filters and then, if event has not been
128 * filtered out, through all open handles. This function is called with
129 * dev->event_lock held and interrupts disabled.
131 static void input_pass_values(struct input_dev *dev,
132 struct input_value *vals, unsigned int count)
134 struct input_handle *handle;
135 struct input_value *v;
142 handle = rcu_dereference(dev->grab);
144 count = input_to_handler(handle, vals, count);
146 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
148 count = input_to_handler(handle, vals, count);
156 /* trigger auto repeat for key events */
157 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
158 for (v = vals; v != vals + count; v++) {
159 if (v->type == EV_KEY && v->value != 2) {
161 input_start_autorepeat(dev, v->code);
163 input_stop_autorepeat(dev);
169 static void input_pass_event(struct input_dev *dev,
170 unsigned int type, unsigned int code, int value)
172 struct input_value vals[] = { { type, code, value } };
174 input_pass_values(dev, vals, ARRAY_SIZE(vals));
178 * Generate software autorepeat event. Note that we take
179 * dev->event_lock here to avoid racing with input_event
180 * which may cause keys get "stuck".
182 static void input_repeat_key(unsigned long data)
184 struct input_dev *dev = (void *) data;
187 spin_lock_irqsave(&dev->event_lock, flags);
189 if (test_bit(dev->repeat_key, dev->key) &&
190 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
191 struct input_value vals[] = {
192 { EV_KEY, dev->repeat_key, 2 },
196 input_pass_values(dev, vals, ARRAY_SIZE(vals));
198 if (dev->rep[REP_PERIOD])
199 mod_timer(&dev->timer, jiffies +
200 msecs_to_jiffies(dev->rep[REP_PERIOD]));
203 spin_unlock_irqrestore(&dev->event_lock, flags);
206 #define INPUT_IGNORE_EVENT 0
207 #define INPUT_PASS_TO_HANDLERS 1
208 #define INPUT_PASS_TO_DEVICE 2
210 #define INPUT_FLUSH 8
211 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
213 static int input_handle_abs_event(struct input_dev *dev,
214 unsigned int code, int *pval)
216 struct input_mt *mt = dev->mt;
220 if (code == ABS_MT_SLOT) {
222 * "Stage" the event; we'll flush it later, when we
223 * get actual touch data.
225 if (mt && *pval >= 0 && *pval < mt->num_slots)
228 return INPUT_IGNORE_EVENT;
231 is_mt_event = input_is_mt_value(code);
234 pold = &dev->absinfo[code].value;
236 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
239 * Bypass filtering for multi-touch events when
240 * not employing slots.
246 *pval = input_defuzz_abs_event(*pval, *pold,
247 dev->absinfo[code].fuzz);
249 return INPUT_IGNORE_EVENT;
254 /* Flush pending "slot" event */
255 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
256 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
257 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
260 return INPUT_PASS_TO_HANDLERS;
263 static int input_get_disposition(struct input_dev *dev,
264 unsigned int type, unsigned int code, int *pval)
266 int disposition = INPUT_IGNORE_EVENT;
274 disposition = INPUT_PASS_TO_ALL;
278 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
281 disposition = INPUT_PASS_TO_HANDLERS;
287 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
289 /* auto-repeat bypasses state updates */
291 disposition = INPUT_PASS_TO_HANDLERS;
295 if (!!test_bit(code, dev->key) != !!value) {
297 __change_bit(code, dev->key);
298 disposition = INPUT_PASS_TO_HANDLERS;
304 if (is_event_supported(code, dev->swbit, SW_MAX) &&
305 !!test_bit(code, dev->sw) != !!value) {
307 __change_bit(code, dev->sw);
308 disposition = INPUT_PASS_TO_HANDLERS;
313 if (is_event_supported(code, dev->absbit, ABS_MAX))
314 disposition = input_handle_abs_event(dev, code, &value);
319 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
320 disposition = INPUT_PASS_TO_HANDLERS;
325 if (is_event_supported(code, dev->mscbit, MSC_MAX))
326 disposition = INPUT_PASS_TO_ALL;
331 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
332 !!test_bit(code, dev->led) != !!value) {
334 __change_bit(code, dev->led);
335 disposition = INPUT_PASS_TO_ALL;
340 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
342 if (!!test_bit(code, dev->snd) != !!value)
343 __change_bit(code, dev->snd);
344 disposition = INPUT_PASS_TO_ALL;
349 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
350 dev->rep[code] = value;
351 disposition = INPUT_PASS_TO_ALL;
357 disposition = INPUT_PASS_TO_ALL;
361 disposition = INPUT_PASS_TO_ALL;
369 static void input_handle_event(struct input_dev *dev,
370 unsigned int type, unsigned int code, int value)
372 int disposition = input_get_disposition(dev, type, code, &value);
374 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
375 add_input_randomness(type, code, value);
377 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
378 dev->event(dev, type, code, value);
383 if (disposition & INPUT_PASS_TO_HANDLERS) {
384 struct input_value *v;
386 if (disposition & INPUT_SLOT) {
387 v = &dev->vals[dev->num_vals++];
389 v->code = ABS_MT_SLOT;
390 v->value = dev->mt->slot;
393 v = &dev->vals[dev->num_vals++];
399 if (disposition & INPUT_FLUSH) {
400 if (dev->num_vals >= 2)
401 input_pass_values(dev, dev->vals, dev->num_vals);
403 } else if (dev->num_vals >= dev->max_vals - 2) {
404 dev->vals[dev->num_vals++] = input_value_sync;
405 input_pass_values(dev, dev->vals, dev->num_vals);
412 * input_event() - report new input event
413 * @dev: device that generated the event
414 * @type: type of the event
416 * @value: value of the event
418 * This function should be used by drivers implementing various input
419 * devices to report input events. See also input_inject_event().
421 * NOTE: input_event() may be safely used right after input device was
422 * allocated with input_allocate_device(), even before it is registered
423 * with input_register_device(), but the event will not reach any of the
424 * input handlers. Such early invocation of input_event() may be used
425 * to 'seed' initial state of a switch or initial position of absolute
428 void input_event(struct input_dev *dev,
429 unsigned int type, unsigned int code, int value)
433 if (is_event_supported(type, dev->evbit, EV_MAX)) {
435 spin_lock_irqsave(&dev->event_lock, flags);
436 input_handle_event(dev, type, code, value);
437 spin_unlock_irqrestore(&dev->event_lock, flags);
440 EXPORT_SYMBOL(input_event);
443 * input_inject_event() - send input event from input handler
444 * @handle: input handle to send event through
445 * @type: type of the event
447 * @value: value of the event
449 * Similar to input_event() but will ignore event if device is
450 * "grabbed" and handle injecting event is not the one that owns
453 void input_inject_event(struct input_handle *handle,
454 unsigned int type, unsigned int code, int value)
456 struct input_dev *dev = handle->dev;
457 struct input_handle *grab;
460 if (is_event_supported(type, dev->evbit, EV_MAX)) {
461 spin_lock_irqsave(&dev->event_lock, flags);
464 grab = rcu_dereference(dev->grab);
465 if (!grab || grab == handle)
466 input_handle_event(dev, type, code, value);
469 spin_unlock_irqrestore(&dev->event_lock, flags);
472 EXPORT_SYMBOL(input_inject_event);
475 * input_alloc_absinfo - allocates array of input_absinfo structs
476 * @dev: the input device emitting absolute events
478 * If the absinfo struct the caller asked for is already allocated, this
479 * functions will not do anything.
481 void input_alloc_absinfo(struct input_dev *dev)
486 dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);
488 dev_err(dev->dev.parent ?: &dev->dev,
489 "%s: unable to allocate memory\n", __func__);
491 * We will handle this allocation failure in
492 * input_register_device() when we refuse to register input
493 * device with ABS bits but without absinfo.
497 EXPORT_SYMBOL(input_alloc_absinfo);
499 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
500 int min, int max, int fuzz, int flat)
502 struct input_absinfo *absinfo;
504 input_alloc_absinfo(dev);
508 absinfo = &dev->absinfo[axis];
509 absinfo->minimum = min;
510 absinfo->maximum = max;
511 absinfo->fuzz = fuzz;
512 absinfo->flat = flat;
514 __set_bit(EV_ABS, dev->evbit);
515 __set_bit(axis, dev->absbit);
517 EXPORT_SYMBOL(input_set_abs_params);
521 * input_grab_device - grabs device for exclusive use
522 * @handle: input handle that wants to own the device
524 * When a device is grabbed by an input handle all events generated by
525 * the device are delivered only to this handle. Also events injected
526 * by other input handles are ignored while device is grabbed.
528 int input_grab_device(struct input_handle *handle)
530 struct input_dev *dev = handle->dev;
533 retval = mutex_lock_interruptible(&dev->mutex);
542 rcu_assign_pointer(dev->grab, handle);
545 mutex_unlock(&dev->mutex);
548 EXPORT_SYMBOL(input_grab_device);
550 static void __input_release_device(struct input_handle *handle)
552 struct input_dev *dev = handle->dev;
553 struct input_handle *grabber;
555 grabber = rcu_dereference_protected(dev->grab,
556 lockdep_is_held(&dev->mutex));
557 if (grabber == handle) {
558 rcu_assign_pointer(dev->grab, NULL);
559 /* Make sure input_pass_event() notices that grab is gone */
562 list_for_each_entry(handle, &dev->h_list, d_node)
563 if (handle->open && handle->handler->start)
564 handle->handler->start(handle);
569 * input_release_device - release previously grabbed device
570 * @handle: input handle that owns the device
572 * Releases previously grabbed device so that other input handles can
573 * start receiving input events. Upon release all handlers attached
574 * to the device have their start() method called so they have a change
575 * to synchronize device state with the rest of the system.
577 void input_release_device(struct input_handle *handle)
579 struct input_dev *dev = handle->dev;
581 mutex_lock(&dev->mutex);
582 __input_release_device(handle);
583 mutex_unlock(&dev->mutex);
585 EXPORT_SYMBOL(input_release_device);
588 * input_open_device - open input device
589 * @handle: handle through which device is being accessed
591 * This function should be called by input handlers when they
592 * want to start receive events from given input device.
594 int input_open_device(struct input_handle *handle)
596 struct input_dev *dev = handle->dev;
599 retval = mutex_lock_interruptible(&dev->mutex);
603 if (dev->going_away) {
610 if (!dev->users++ && dev->open)
611 retval = dev->open(dev);
615 if (!--handle->open) {
617 * Make sure we are not delivering any more events
618 * through this handle
625 mutex_unlock(&dev->mutex);
628 EXPORT_SYMBOL(input_open_device);
630 int input_flush_device(struct input_handle *handle, struct file *file)
632 struct input_dev *dev = handle->dev;
635 retval = mutex_lock_interruptible(&dev->mutex);
640 retval = dev->flush(dev, file);
642 mutex_unlock(&dev->mutex);
645 EXPORT_SYMBOL(input_flush_device);
648 * input_close_device - close input device
649 * @handle: handle through which device is being accessed
651 * This function should be called by input handlers when they
652 * want to stop receive events from given input device.
654 void input_close_device(struct input_handle *handle)
656 struct input_dev *dev = handle->dev;
658 mutex_lock(&dev->mutex);
660 __input_release_device(handle);
662 if (!--dev->users && dev->close)
665 if (!--handle->open) {
667 * synchronize_rcu() makes sure that input_pass_event()
668 * completed and that no more input events are delivered
669 * through this handle
674 mutex_unlock(&dev->mutex);
676 EXPORT_SYMBOL(input_close_device);
679 * Simulate keyup events for all keys that are marked as pressed.
680 * The function must be called with dev->event_lock held.
682 static void input_dev_release_keys(struct input_dev *dev)
684 bool need_sync = false;
687 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
688 for_each_set_bit(code, dev->key, KEY_CNT) {
689 input_pass_event(dev, EV_KEY, code, 0);
694 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
696 memset(dev->key, 0, sizeof(dev->key));
701 * Prepare device for unregistering
703 static void input_disconnect_device(struct input_dev *dev)
705 struct input_handle *handle;
708 * Mark device as going away. Note that we take dev->mutex here
709 * not to protect access to dev->going_away but rather to ensure
710 * that there are no threads in the middle of input_open_device()
712 mutex_lock(&dev->mutex);
713 dev->going_away = true;
714 mutex_unlock(&dev->mutex);
716 spin_lock_irq(&dev->event_lock);
719 * Simulate keyup events for all pressed keys so that handlers
720 * are not left with "stuck" keys. The driver may continue
721 * generate events even after we done here but they will not
722 * reach any handlers.
724 input_dev_release_keys(dev);
726 list_for_each_entry(handle, &dev->h_list, d_node)
729 spin_unlock_irq(&dev->event_lock);
733 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
734 * @ke: keymap entry containing scancode to be converted.
735 * @scancode: pointer to the location where converted scancode should
738 * This function is used to convert scancode stored in &struct keymap_entry
739 * into scalar form understood by legacy keymap handling methods. These
740 * methods expect scancodes to be represented as 'unsigned int'.
742 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
743 unsigned int *scancode)
747 *scancode = *((u8 *)ke->scancode);
751 *scancode = *((u16 *)ke->scancode);
755 *scancode = *((u32 *)ke->scancode);
764 EXPORT_SYMBOL(input_scancode_to_scalar);
767 * Those routines handle the default case where no [gs]etkeycode() is
768 * defined. In this case, an array indexed by the scancode is used.
771 static unsigned int input_fetch_keycode(struct input_dev *dev,
774 switch (dev->keycodesize) {
776 return ((u8 *)dev->keycode)[index];
779 return ((u16 *)dev->keycode)[index];
782 return ((u32 *)dev->keycode)[index];
786 static int input_default_getkeycode(struct input_dev *dev,
787 struct input_keymap_entry *ke)
792 if (!dev->keycodesize)
795 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
798 error = input_scancode_to_scalar(ke, &index);
803 if (index >= dev->keycodemax)
806 ke->keycode = input_fetch_keycode(dev, index);
808 ke->len = sizeof(index);
809 memcpy(ke->scancode, &index, sizeof(index));
814 static int input_default_setkeycode(struct input_dev *dev,
815 const struct input_keymap_entry *ke,
816 unsigned int *old_keycode)
822 if (!dev->keycodesize)
825 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
828 error = input_scancode_to_scalar(ke, &index);
833 if (index >= dev->keycodemax)
836 if (dev->keycodesize < sizeof(ke->keycode) &&
837 (ke->keycode >> (dev->keycodesize * 8)))
840 switch (dev->keycodesize) {
842 u8 *k = (u8 *)dev->keycode;
843 *old_keycode = k[index];
844 k[index] = ke->keycode;
848 u16 *k = (u16 *)dev->keycode;
849 *old_keycode = k[index];
850 k[index] = ke->keycode;
854 u32 *k = (u32 *)dev->keycode;
855 *old_keycode = k[index];
856 k[index] = ke->keycode;
861 __clear_bit(*old_keycode, dev->keybit);
862 __set_bit(ke->keycode, dev->keybit);
864 for (i = 0; i < dev->keycodemax; i++) {
865 if (input_fetch_keycode(dev, i) == *old_keycode) {
866 __set_bit(*old_keycode, dev->keybit);
867 break; /* Setting the bit twice is useless, so break */
875 * input_get_keycode - retrieve keycode currently mapped to a given scancode
876 * @dev: input device which keymap is being queried
879 * This function should be called by anyone interested in retrieving current
880 * keymap. Presently evdev handlers use it.
882 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
887 spin_lock_irqsave(&dev->event_lock, flags);
888 retval = dev->getkeycode(dev, ke);
889 spin_unlock_irqrestore(&dev->event_lock, flags);
893 EXPORT_SYMBOL(input_get_keycode);
896 * input_set_keycode - attribute a keycode to a given scancode
897 * @dev: input device which keymap is being updated
898 * @ke: new keymap entry
900 * This function should be called by anyone needing to update current
901 * keymap. Presently keyboard and evdev handlers use it.
903 int input_set_keycode(struct input_dev *dev,
904 const struct input_keymap_entry *ke)
907 unsigned int old_keycode;
910 if (ke->keycode > KEY_MAX)
913 spin_lock_irqsave(&dev->event_lock, flags);
915 retval = dev->setkeycode(dev, ke, &old_keycode);
919 /* Make sure KEY_RESERVED did not get enabled. */
920 __clear_bit(KEY_RESERVED, dev->keybit);
923 * Simulate keyup event if keycode is not present
924 * in the keymap anymore
926 if (test_bit(EV_KEY, dev->evbit) &&
927 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
928 __test_and_clear_bit(old_keycode, dev->key)) {
929 struct input_value vals[] = {
930 { EV_KEY, old_keycode, 0 },
934 input_pass_values(dev, vals, ARRAY_SIZE(vals));
938 spin_unlock_irqrestore(&dev->event_lock, flags);
942 EXPORT_SYMBOL(input_set_keycode);
944 bool input_match_device_id(const struct input_dev *dev,
945 const struct input_device_id *id)
947 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
948 if (id->bustype != dev->id.bustype)
951 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
952 if (id->vendor != dev->id.vendor)
955 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
956 if (id->product != dev->id.product)
959 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
960 if (id->version != dev->id.version)
963 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
964 !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
965 !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
966 !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
967 !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
968 !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
969 !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
970 !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
971 !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
972 !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
978 EXPORT_SYMBOL(input_match_device_id);
980 static const struct input_device_id *input_match_device(struct input_handler *handler,
981 struct input_dev *dev)
983 const struct input_device_id *id;
985 for (id = handler->id_table; id->flags || id->driver_info; id++) {
986 if (input_match_device_id(dev, id) &&
987 (!handler->match || handler->match(handler, dev))) {
995 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
997 const struct input_device_id *id;
1000 id = input_match_device(handler, dev);
1004 error = handler->connect(handler, dev, id);
1005 if (error && error != -ENODEV)
1006 pr_err("failed to attach handler %s to device %s, error: %d\n",
1007 handler->name, kobject_name(&dev->dev.kobj), error);
1012 #ifdef CONFIG_COMPAT
1014 static int input_bits_to_string(char *buf, int buf_size,
1015 unsigned long bits, bool skip_empty)
1019 if (in_compat_syscall()) {
1020 u32 dword = bits >> 32;
1021 if (dword || !skip_empty)
1022 len += snprintf(buf, buf_size, "%x ", dword);
1024 dword = bits & 0xffffffffUL;
1025 if (dword || !skip_empty || len)
1026 len += snprintf(buf + len, max(buf_size - len, 0),
1029 if (bits || !skip_empty)
1030 len += snprintf(buf, buf_size, "%lx", bits);
1036 #else /* !CONFIG_COMPAT */
1038 static int input_bits_to_string(char *buf, int buf_size,
1039 unsigned long bits, bool skip_empty)
1041 return bits || !skip_empty ?
1042 snprintf(buf, buf_size, "%lx", bits) : 0;
1047 #ifdef CONFIG_PROC_FS
1049 static struct proc_dir_entry *proc_bus_input_dir;
1050 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1051 static int input_devices_state;
1053 static inline void input_wakeup_procfs_readers(void)
1055 input_devices_state++;
1056 wake_up(&input_devices_poll_wait);
1059 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
1061 poll_wait(file, &input_devices_poll_wait, wait);
1062 if (file->f_version != input_devices_state) {
1063 file->f_version = input_devices_state;
1064 return POLLIN | POLLRDNORM;
1070 union input_seq_state {
1073 bool mutex_acquired;
1078 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1080 union input_seq_state *state = (union input_seq_state *)&seq->private;
1083 /* We need to fit into seq->private pointer */
1084 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1086 error = mutex_lock_interruptible(&input_mutex);
1088 state->mutex_acquired = false;
1089 return ERR_PTR(error);
1092 state->mutex_acquired = true;
1094 return seq_list_start(&input_dev_list, *pos);
1097 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1099 return seq_list_next(v, &input_dev_list, pos);
1102 static void input_seq_stop(struct seq_file *seq, void *v)
1104 union input_seq_state *state = (union input_seq_state *)&seq->private;
1106 if (state->mutex_acquired)
1107 mutex_unlock(&input_mutex);
1110 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1111 unsigned long *bitmap, int max)
1114 bool skip_empty = true;
1117 seq_printf(seq, "B: %s=", name);
1119 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1120 if (input_bits_to_string(buf, sizeof(buf),
1121 bitmap[i], skip_empty)) {
1123 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1128 * If no output was produced print a single 0.
1133 seq_putc(seq, '\n');
1136 static int input_devices_seq_show(struct seq_file *seq, void *v)
1138 struct input_dev *dev = container_of(v, struct input_dev, node);
1139 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1140 struct input_handle *handle;
1142 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1143 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1145 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1146 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1147 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1148 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1149 seq_puts(seq, "H: Handlers=");
1151 list_for_each_entry(handle, &dev->h_list, d_node)
1152 seq_printf(seq, "%s ", handle->name);
1153 seq_putc(seq, '\n');
1155 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1157 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1158 if (test_bit(EV_KEY, dev->evbit))
1159 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1160 if (test_bit(EV_REL, dev->evbit))
1161 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1162 if (test_bit(EV_ABS, dev->evbit))
1163 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1164 if (test_bit(EV_MSC, dev->evbit))
1165 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1166 if (test_bit(EV_LED, dev->evbit))
1167 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1168 if (test_bit(EV_SND, dev->evbit))
1169 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1170 if (test_bit(EV_FF, dev->evbit))
1171 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1172 if (test_bit(EV_SW, dev->evbit))
1173 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1175 seq_putc(seq, '\n');
1181 static const struct seq_operations input_devices_seq_ops = {
1182 .start = input_devices_seq_start,
1183 .next = input_devices_seq_next,
1184 .stop = input_seq_stop,
1185 .show = input_devices_seq_show,
1188 static int input_proc_devices_open(struct inode *inode, struct file *file)
1190 return seq_open(file, &input_devices_seq_ops);
1193 static const struct file_operations input_devices_fileops = {
1194 .owner = THIS_MODULE,
1195 .open = input_proc_devices_open,
1196 .poll = input_proc_devices_poll,
1198 .llseek = seq_lseek,
1199 .release = seq_release,
1202 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1204 union input_seq_state *state = (union input_seq_state *)&seq->private;
1207 /* We need to fit into seq->private pointer */
1208 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1210 error = mutex_lock_interruptible(&input_mutex);
1212 state->mutex_acquired = false;
1213 return ERR_PTR(error);
1216 state->mutex_acquired = true;
1219 return seq_list_start(&input_handler_list, *pos);
1222 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1224 union input_seq_state *state = (union input_seq_state *)&seq->private;
1226 state->pos = *pos + 1;
1227 return seq_list_next(v, &input_handler_list, pos);
1230 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1232 struct input_handler *handler = container_of(v, struct input_handler, node);
1233 union input_seq_state *state = (union input_seq_state *)&seq->private;
1235 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1236 if (handler->filter)
1237 seq_puts(seq, " (filter)");
1238 if (handler->legacy_minors)
1239 seq_printf(seq, " Minor=%d", handler->minor);
1240 seq_putc(seq, '\n');
1245 static const struct seq_operations input_handlers_seq_ops = {
1246 .start = input_handlers_seq_start,
1247 .next = input_handlers_seq_next,
1248 .stop = input_seq_stop,
1249 .show = input_handlers_seq_show,
1252 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1254 return seq_open(file, &input_handlers_seq_ops);
1257 static const struct file_operations input_handlers_fileops = {
1258 .owner = THIS_MODULE,
1259 .open = input_proc_handlers_open,
1261 .llseek = seq_lseek,
1262 .release = seq_release,
1265 static int __init input_proc_init(void)
1267 struct proc_dir_entry *entry;
1269 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1270 if (!proc_bus_input_dir)
1273 entry = proc_create("devices", 0, proc_bus_input_dir,
1274 &input_devices_fileops);
1278 entry = proc_create("handlers", 0, proc_bus_input_dir,
1279 &input_handlers_fileops);
1285 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1286 fail1: remove_proc_entry("bus/input", NULL);
1290 static void input_proc_exit(void)
1292 remove_proc_entry("devices", proc_bus_input_dir);
1293 remove_proc_entry("handlers", proc_bus_input_dir);
1294 remove_proc_entry("bus/input", NULL);
1297 #else /* !CONFIG_PROC_FS */
1298 static inline void input_wakeup_procfs_readers(void) { }
1299 static inline int input_proc_init(void) { return 0; }
1300 static inline void input_proc_exit(void) { }
1303 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1304 static ssize_t input_dev_show_##name(struct device *dev, \
1305 struct device_attribute *attr, \
1308 struct input_dev *input_dev = to_input_dev(dev); \
1310 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1311 input_dev->name ? input_dev->name : ""); \
1313 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1315 INPUT_DEV_STRING_ATTR_SHOW(name);
1316 INPUT_DEV_STRING_ATTR_SHOW(phys);
1317 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1319 static int input_print_modalias_bits(char *buf, int size,
1320 char name, unsigned long *bm,
1321 unsigned int min_bit, unsigned int max_bit)
1325 len += snprintf(buf, max(size, 0), "%c", name);
1326 for (i = min_bit; i < max_bit; i++)
1327 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1328 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1332 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1337 len = snprintf(buf, max(size, 0),
1338 "input:b%04Xv%04Xp%04Xe%04X-",
1339 id->id.bustype, id->id.vendor,
1340 id->id.product, id->id.version);
1342 len += input_print_modalias_bits(buf + len, size - len,
1343 'e', id->evbit, 0, EV_MAX);
1344 len += input_print_modalias_bits(buf + len, size - len,
1345 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1346 len += input_print_modalias_bits(buf + len, size - len,
1347 'r', id->relbit, 0, REL_MAX);
1348 len += input_print_modalias_bits(buf + len, size - len,
1349 'a', id->absbit, 0, ABS_MAX);
1350 len += input_print_modalias_bits(buf + len, size - len,
1351 'm', id->mscbit, 0, MSC_MAX);
1352 len += input_print_modalias_bits(buf + len, size - len,
1353 'l', id->ledbit, 0, LED_MAX);
1354 len += input_print_modalias_bits(buf + len, size - len,
1355 's', id->sndbit, 0, SND_MAX);
1356 len += input_print_modalias_bits(buf + len, size - len,
1357 'f', id->ffbit, 0, FF_MAX);
1358 len += input_print_modalias_bits(buf + len, size - len,
1359 'w', id->swbit, 0, SW_MAX);
1362 len += snprintf(buf + len, max(size - len, 0), "\n");
1367 static ssize_t input_dev_show_modalias(struct device *dev,
1368 struct device_attribute *attr,
1371 struct input_dev *id = to_input_dev(dev);
1374 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1376 return min_t(int, len, PAGE_SIZE);
1378 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1380 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1381 int max, int add_cr);
1383 static ssize_t input_dev_show_properties(struct device *dev,
1384 struct device_attribute *attr,
1387 struct input_dev *input_dev = to_input_dev(dev);
1388 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1389 INPUT_PROP_MAX, true);
1390 return min_t(int, len, PAGE_SIZE);
1392 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1394 static struct attribute *input_dev_attrs[] = {
1395 &dev_attr_name.attr,
1396 &dev_attr_phys.attr,
1397 &dev_attr_uniq.attr,
1398 &dev_attr_modalias.attr,
1399 &dev_attr_properties.attr,
1403 static const struct attribute_group input_dev_attr_group = {
1404 .attrs = input_dev_attrs,
1407 #define INPUT_DEV_ID_ATTR(name) \
1408 static ssize_t input_dev_show_id_##name(struct device *dev, \
1409 struct device_attribute *attr, \
1412 struct input_dev *input_dev = to_input_dev(dev); \
1413 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1415 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1417 INPUT_DEV_ID_ATTR(bustype);
1418 INPUT_DEV_ID_ATTR(vendor);
1419 INPUT_DEV_ID_ATTR(product);
1420 INPUT_DEV_ID_ATTR(version);
1422 static struct attribute *input_dev_id_attrs[] = {
1423 &dev_attr_bustype.attr,
1424 &dev_attr_vendor.attr,
1425 &dev_attr_product.attr,
1426 &dev_attr_version.attr,
1430 static const struct attribute_group input_dev_id_attr_group = {
1432 .attrs = input_dev_id_attrs,
1435 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1436 int max, int add_cr)
1440 bool skip_empty = true;
1442 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1443 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1444 bitmap[i], skip_empty);
1448 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1453 * If no output was produced print a single 0.
1456 len = snprintf(buf, buf_size, "%d", 0);
1459 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1464 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1465 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1466 struct device_attribute *attr, \
1469 struct input_dev *input_dev = to_input_dev(dev); \
1470 int len = input_print_bitmap(buf, PAGE_SIZE, \
1471 input_dev->bm##bit, ev##_MAX, \
1473 return min_t(int, len, PAGE_SIZE); \
1475 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1477 INPUT_DEV_CAP_ATTR(EV, ev);
1478 INPUT_DEV_CAP_ATTR(KEY, key);
1479 INPUT_DEV_CAP_ATTR(REL, rel);
1480 INPUT_DEV_CAP_ATTR(ABS, abs);
1481 INPUT_DEV_CAP_ATTR(MSC, msc);
1482 INPUT_DEV_CAP_ATTR(LED, led);
1483 INPUT_DEV_CAP_ATTR(SND, snd);
1484 INPUT_DEV_CAP_ATTR(FF, ff);
1485 INPUT_DEV_CAP_ATTR(SW, sw);
1487 static struct attribute *input_dev_caps_attrs[] = {
1500 static const struct attribute_group input_dev_caps_attr_group = {
1501 .name = "capabilities",
1502 .attrs = input_dev_caps_attrs,
1505 static const struct attribute_group *input_dev_attr_groups[] = {
1506 &input_dev_attr_group,
1507 &input_dev_id_attr_group,
1508 &input_dev_caps_attr_group,
1512 static void input_dev_release(struct device *device)
1514 struct input_dev *dev = to_input_dev(device);
1516 input_ff_destroy(dev);
1517 input_mt_destroy_slots(dev);
1518 kfree(dev->absinfo);
1522 module_put(THIS_MODULE);
1526 * Input uevent interface - loading event handlers based on
1529 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1530 const char *name, unsigned long *bitmap, int max)
1534 if (add_uevent_var(env, "%s", name))
1537 len = input_print_bitmap(&env->buf[env->buflen - 1],
1538 sizeof(env->buf) - env->buflen,
1539 bitmap, max, false);
1540 if (len >= (sizeof(env->buf) - env->buflen))
1547 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1548 struct input_dev *dev)
1552 if (add_uevent_var(env, "MODALIAS="))
1555 len = input_print_modalias(&env->buf[env->buflen - 1],
1556 sizeof(env->buf) - env->buflen,
1558 if (len >= (sizeof(env->buf) - env->buflen))
1565 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1567 int err = add_uevent_var(env, fmt, val); \
1572 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1574 int err = input_add_uevent_bm_var(env, name, bm, max); \
1579 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1581 int err = input_add_uevent_modalias_var(env, dev); \
1586 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1588 struct input_dev *dev = to_input_dev(device);
1590 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1591 dev->id.bustype, dev->id.vendor,
1592 dev->id.product, dev->id.version);
1594 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1596 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1598 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1600 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1602 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1603 if (test_bit(EV_KEY, dev->evbit))
1604 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1605 if (test_bit(EV_REL, dev->evbit))
1606 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1607 if (test_bit(EV_ABS, dev->evbit))
1608 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1609 if (test_bit(EV_MSC, dev->evbit))
1610 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1611 if (test_bit(EV_LED, dev->evbit))
1612 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1613 if (test_bit(EV_SND, dev->evbit))
1614 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1615 if (test_bit(EV_FF, dev->evbit))
1616 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1617 if (test_bit(EV_SW, dev->evbit))
1618 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1620 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1625 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1630 if (!test_bit(EV_##type, dev->evbit)) \
1633 for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
1634 active = test_bit(i, dev->bits); \
1635 if (!active && !on) \
1638 dev->event(dev, EV_##type, i, on ? active : 0); \
1642 static void input_dev_toggle(struct input_dev *dev, bool activate)
1647 INPUT_DO_TOGGLE(dev, LED, led, activate);
1648 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1650 if (activate && test_bit(EV_REP, dev->evbit)) {
1651 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1652 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1657 * input_reset_device() - reset/restore the state of input device
1658 * @dev: input device whose state needs to be reset
1660 * This function tries to reset the state of an opened input device and
1661 * bring internal state and state if the hardware in sync with each other.
1662 * We mark all keys as released, restore LED state, repeat rate, etc.
1664 void input_reset_device(struct input_dev *dev)
1666 unsigned long flags;
1668 mutex_lock(&dev->mutex);
1669 spin_lock_irqsave(&dev->event_lock, flags);
1671 input_dev_toggle(dev, true);
1672 input_dev_release_keys(dev);
1674 spin_unlock_irqrestore(&dev->event_lock, flags);
1675 mutex_unlock(&dev->mutex);
1677 EXPORT_SYMBOL(input_reset_device);
1679 #ifdef CONFIG_PM_SLEEP
1680 static int input_dev_suspend(struct device *dev)
1682 struct input_dev *input_dev = to_input_dev(dev);
1684 spin_lock_irq(&input_dev->event_lock);
1687 * Keys that are pressed now are unlikely to be
1688 * still pressed when we resume.
1690 input_dev_release_keys(input_dev);
1692 /* Turn off LEDs and sounds, if any are active. */
1693 input_dev_toggle(input_dev, false);
1695 spin_unlock_irq(&input_dev->event_lock);
1700 static int input_dev_resume(struct device *dev)
1702 struct input_dev *input_dev = to_input_dev(dev);
1704 spin_lock_irq(&input_dev->event_lock);
1706 /* Restore state of LEDs and sounds, if any were active. */
1707 input_dev_toggle(input_dev, true);
1709 spin_unlock_irq(&input_dev->event_lock);
1714 static int input_dev_freeze(struct device *dev)
1716 struct input_dev *input_dev = to_input_dev(dev);
1718 spin_lock_irq(&input_dev->event_lock);
1721 * Keys that are pressed now are unlikely to be
1722 * still pressed when we resume.
1724 input_dev_release_keys(input_dev);
1726 spin_unlock_irq(&input_dev->event_lock);
1731 static int input_dev_poweroff(struct device *dev)
1733 struct input_dev *input_dev = to_input_dev(dev);
1735 spin_lock_irq(&input_dev->event_lock);
1737 /* Turn off LEDs and sounds, if any are active. */
1738 input_dev_toggle(input_dev, false);
1740 spin_unlock_irq(&input_dev->event_lock);
1745 static const struct dev_pm_ops input_dev_pm_ops = {
1746 .suspend = input_dev_suspend,
1747 .resume = input_dev_resume,
1748 .freeze = input_dev_freeze,
1749 .poweroff = input_dev_poweroff,
1750 .restore = input_dev_resume,
1752 #endif /* CONFIG_PM */
1754 static const struct device_type input_dev_type = {
1755 .groups = input_dev_attr_groups,
1756 .release = input_dev_release,
1757 .uevent = input_dev_uevent,
1758 #ifdef CONFIG_PM_SLEEP
1759 .pm = &input_dev_pm_ops,
1763 static char *input_devnode(struct device *dev, umode_t *mode)
1765 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1768 struct class input_class = {
1770 .devnode = input_devnode,
1772 EXPORT_SYMBOL_GPL(input_class);
1775 * input_allocate_device - allocate memory for new input device
1777 * Returns prepared struct input_dev or %NULL.
1779 * NOTE: Use input_free_device() to free devices that have not been
1780 * registered; input_unregister_device() should be used for already
1781 * registered devices.
1783 struct input_dev *input_allocate_device(void)
1785 static atomic_t input_no = ATOMIC_INIT(-1);
1786 struct input_dev *dev;
1788 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1790 dev->dev.type = &input_dev_type;
1791 dev->dev.class = &input_class;
1792 device_initialize(&dev->dev);
1793 mutex_init(&dev->mutex);
1794 spin_lock_init(&dev->event_lock);
1795 init_timer(&dev->timer);
1796 INIT_LIST_HEAD(&dev->h_list);
1797 INIT_LIST_HEAD(&dev->node);
1799 dev_set_name(&dev->dev, "input%lu",
1800 (unsigned long)atomic_inc_return(&input_no));
1802 __module_get(THIS_MODULE);
1807 EXPORT_SYMBOL(input_allocate_device);
1809 struct input_devres {
1810 struct input_dev *input;
1813 static int devm_input_device_match(struct device *dev, void *res, void *data)
1815 struct input_devres *devres = res;
1817 return devres->input == data;
1820 static void devm_input_device_release(struct device *dev, void *res)
1822 struct input_devres *devres = res;
1823 struct input_dev *input = devres->input;
1825 dev_dbg(dev, "%s: dropping reference to %s\n",
1826 __func__, dev_name(&input->dev));
1827 input_put_device(input);
1831 * devm_input_allocate_device - allocate managed input device
1832 * @dev: device owning the input device being created
1834 * Returns prepared struct input_dev or %NULL.
1836 * Managed input devices do not need to be explicitly unregistered or
1837 * freed as it will be done automatically when owner device unbinds from
1838 * its driver (or binding fails). Once managed input device is allocated,
1839 * it is ready to be set up and registered in the same fashion as regular
1840 * input device. There are no special devm_input_device_[un]register()
1841 * variants, regular ones work with both managed and unmanaged devices,
1842 * should you need them. In most cases however, managed input device need
1843 * not be explicitly unregistered or freed.
1845 * NOTE: the owner device is set up as parent of input device and users
1846 * should not override it.
1848 struct input_dev *devm_input_allocate_device(struct device *dev)
1850 struct input_dev *input;
1851 struct input_devres *devres;
1853 devres = devres_alloc(devm_input_device_release,
1854 sizeof(*devres), GFP_KERNEL);
1858 input = input_allocate_device();
1860 devres_free(devres);
1864 input->dev.parent = dev;
1865 input->devres_managed = true;
1867 devres->input = input;
1868 devres_add(dev, devres);
1872 EXPORT_SYMBOL(devm_input_allocate_device);
1875 * input_free_device - free memory occupied by input_dev structure
1876 * @dev: input device to free
1878 * This function should only be used if input_register_device()
1879 * was not called yet or if it failed. Once device was registered
1880 * use input_unregister_device() and memory will be freed once last
1881 * reference to the device is dropped.
1883 * Device should be allocated by input_allocate_device().
1885 * NOTE: If there are references to the input device then memory
1886 * will not be freed until last reference is dropped.
1888 void input_free_device(struct input_dev *dev)
1891 if (dev->devres_managed)
1892 WARN_ON(devres_destroy(dev->dev.parent,
1893 devm_input_device_release,
1894 devm_input_device_match,
1896 input_put_device(dev);
1899 EXPORT_SYMBOL(input_free_device);
1902 * input_set_capability - mark device as capable of a certain event
1903 * @dev: device that is capable of emitting or accepting event
1904 * @type: type of the event (EV_KEY, EV_REL, etc...)
1907 * In addition to setting up corresponding bit in appropriate capability
1908 * bitmap the function also adjusts dev->evbit.
1910 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1914 __set_bit(code, dev->keybit);
1918 __set_bit(code, dev->relbit);
1922 input_alloc_absinfo(dev);
1926 __set_bit(code, dev->absbit);
1930 __set_bit(code, dev->mscbit);
1934 __set_bit(code, dev->swbit);
1938 __set_bit(code, dev->ledbit);
1942 __set_bit(code, dev->sndbit);
1946 __set_bit(code, dev->ffbit);
1954 pr_err("input_set_capability: unknown type %u (code %u)\n",
1960 __set_bit(type, dev->evbit);
1962 EXPORT_SYMBOL(input_set_capability);
1964 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1968 unsigned int events;
1971 mt_slots = dev->mt->num_slots;
1972 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1973 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1974 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1975 mt_slots = clamp(mt_slots, 2, 32);
1976 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1982 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1984 if (test_bit(EV_ABS, dev->evbit))
1985 for_each_set_bit(i, dev->absbit, ABS_CNT)
1986 events += input_is_mt_axis(i) ? mt_slots : 1;
1988 if (test_bit(EV_REL, dev->evbit))
1989 events += bitmap_weight(dev->relbit, REL_CNT);
1991 /* Make room for KEY and MSC events */
1997 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1999 if (!test_bit(EV_##type, dev->evbit)) \
2000 memset(dev->bits##bit, 0, \
2001 sizeof(dev->bits##bit)); \
2004 static void input_cleanse_bitmasks(struct input_dev *dev)
2006 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2007 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2008 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2009 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2010 INPUT_CLEANSE_BITMASK(dev, LED, led);
2011 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2012 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2013 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2016 static void __input_unregister_device(struct input_dev *dev)
2018 struct input_handle *handle, *next;
2020 input_disconnect_device(dev);
2022 mutex_lock(&input_mutex);
2024 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2025 handle->handler->disconnect(handle);
2026 WARN_ON(!list_empty(&dev->h_list));
2028 del_timer_sync(&dev->timer);
2029 list_del_init(&dev->node);
2031 input_wakeup_procfs_readers();
2033 mutex_unlock(&input_mutex);
2035 device_del(&dev->dev);
2038 static void devm_input_device_unregister(struct device *dev, void *res)
2040 struct input_devres *devres = res;
2041 struct input_dev *input = devres->input;
2043 dev_dbg(dev, "%s: unregistering device %s\n",
2044 __func__, dev_name(&input->dev));
2045 __input_unregister_device(input);
2049 * input_enable_softrepeat - enable software autorepeat
2050 * @dev: input device
2051 * @delay: repeat delay
2052 * @period: repeat period
2054 * Enable software autorepeat on the input device.
2056 void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
2058 dev->timer.data = (unsigned long) dev;
2059 dev->timer.function = input_repeat_key;
2060 dev->rep[REP_DELAY] = delay;
2061 dev->rep[REP_PERIOD] = period;
2063 EXPORT_SYMBOL(input_enable_softrepeat);
2066 * input_register_device - register device with input core
2067 * @dev: device to be registered
2069 * This function registers device with input core. The device must be
2070 * allocated with input_allocate_device() and all it's capabilities
2071 * set up before registering.
2072 * If function fails the device must be freed with input_free_device().
2073 * Once device has been successfully registered it can be unregistered
2074 * with input_unregister_device(); input_free_device() should not be
2075 * called in this case.
2077 * Note that this function is also used to register managed input devices
2078 * (ones allocated with devm_input_allocate_device()). Such managed input
2079 * devices need not be explicitly unregistered or freed, their tear down
2080 * is controlled by the devres infrastructure. It is also worth noting
2081 * that tear down of managed input devices is internally a 2-step process:
2082 * registered managed input device is first unregistered, but stays in
2083 * memory and can still handle input_event() calls (although events will
2084 * not be delivered anywhere). The freeing of managed input device will
2085 * happen later, when devres stack is unwound to the point where device
2086 * allocation was made.
2088 int input_register_device(struct input_dev *dev)
2090 struct input_devres *devres = NULL;
2091 struct input_handler *handler;
2092 unsigned int packet_size;
2096 if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
2098 "Absolute device without dev->absinfo, refusing to register\n");
2102 if (dev->devres_managed) {
2103 devres = devres_alloc(devm_input_device_unregister,
2104 sizeof(*devres), GFP_KERNEL);
2108 devres->input = dev;
2111 /* Every input device generates EV_SYN/SYN_REPORT events. */
2112 __set_bit(EV_SYN, dev->evbit);
2114 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2115 __clear_bit(KEY_RESERVED, dev->keybit);
2117 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2118 input_cleanse_bitmasks(dev);
2120 packet_size = input_estimate_events_per_packet(dev);
2121 if (dev->hint_events_per_packet < packet_size)
2122 dev->hint_events_per_packet = packet_size;
2124 dev->max_vals = dev->hint_events_per_packet + 2;
2125 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2128 goto err_devres_free;
2132 * If delay and period are pre-set by the driver, then autorepeating
2133 * is handled by the driver itself and we don't do it in input.c.
2135 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
2136 input_enable_softrepeat(dev, 250, 33);
2138 if (!dev->getkeycode)
2139 dev->getkeycode = input_default_getkeycode;
2141 if (!dev->setkeycode)
2142 dev->setkeycode = input_default_setkeycode;
2144 error = device_add(&dev->dev);
2148 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2149 pr_info("%s as %s\n",
2150 dev->name ? dev->name : "Unspecified device",
2151 path ? path : "N/A");
2154 error = mutex_lock_interruptible(&input_mutex);
2156 goto err_device_del;
2158 list_add_tail(&dev->node, &input_dev_list);
2160 list_for_each_entry(handler, &input_handler_list, node)
2161 input_attach_handler(dev, handler);
2163 input_wakeup_procfs_readers();
2165 mutex_unlock(&input_mutex);
2167 if (dev->devres_managed) {
2168 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2169 __func__, dev_name(&dev->dev));
2170 devres_add(dev->dev.parent, devres);
2175 device_del(&dev->dev);
2180 devres_free(devres);
2183 EXPORT_SYMBOL(input_register_device);
2186 * input_unregister_device - unregister previously registered device
2187 * @dev: device to be unregistered
2189 * This function unregisters an input device. Once device is unregistered
2190 * the caller should not try to access it as it may get freed at any moment.
2192 void input_unregister_device(struct input_dev *dev)
2194 if (dev->devres_managed) {
2195 WARN_ON(devres_destroy(dev->dev.parent,
2196 devm_input_device_unregister,
2197 devm_input_device_match,
2199 __input_unregister_device(dev);
2201 * We do not do input_put_device() here because it will be done
2202 * when 2nd devres fires up.
2205 __input_unregister_device(dev);
2206 input_put_device(dev);
2209 EXPORT_SYMBOL(input_unregister_device);
2212 * input_register_handler - register a new input handler
2213 * @handler: handler to be registered
2215 * This function registers a new input handler (interface) for input
2216 * devices in the system and attaches it to all input devices that
2217 * are compatible with the handler.
2219 int input_register_handler(struct input_handler *handler)
2221 struct input_dev *dev;
2224 error = mutex_lock_interruptible(&input_mutex);
2228 INIT_LIST_HEAD(&handler->h_list);
2230 list_add_tail(&handler->node, &input_handler_list);
2232 list_for_each_entry(dev, &input_dev_list, node)
2233 input_attach_handler(dev, handler);
2235 input_wakeup_procfs_readers();
2237 mutex_unlock(&input_mutex);
2240 EXPORT_SYMBOL(input_register_handler);
2243 * input_unregister_handler - unregisters an input handler
2244 * @handler: handler to be unregistered
2246 * This function disconnects a handler from its input devices and
2247 * removes it from lists of known handlers.
2249 void input_unregister_handler(struct input_handler *handler)
2251 struct input_handle *handle, *next;
2253 mutex_lock(&input_mutex);
2255 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2256 handler->disconnect(handle);
2257 WARN_ON(!list_empty(&handler->h_list));
2259 list_del_init(&handler->node);
2261 input_wakeup_procfs_readers();
2263 mutex_unlock(&input_mutex);
2265 EXPORT_SYMBOL(input_unregister_handler);
2268 * input_handler_for_each_handle - handle iterator
2269 * @handler: input handler to iterate
2270 * @data: data for the callback
2271 * @fn: function to be called for each handle
2273 * Iterate over @bus's list of devices, and call @fn for each, passing
2274 * it @data and stop when @fn returns a non-zero value. The function is
2275 * using RCU to traverse the list and therefore may be using in atomic
2276 * contexts. The @fn callback is invoked from RCU critical section and
2277 * thus must not sleep.
2279 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2280 int (*fn)(struct input_handle *, void *))
2282 struct input_handle *handle;
2287 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2288 retval = fn(handle, data);
2297 EXPORT_SYMBOL(input_handler_for_each_handle);
2300 * input_register_handle - register a new input handle
2301 * @handle: handle to register
2303 * This function puts a new input handle onto device's
2304 * and handler's lists so that events can flow through
2305 * it once it is opened using input_open_device().
2307 * This function is supposed to be called from handler's
2310 int input_register_handle(struct input_handle *handle)
2312 struct input_handler *handler = handle->handler;
2313 struct input_dev *dev = handle->dev;
2317 * We take dev->mutex here to prevent race with
2318 * input_release_device().
2320 error = mutex_lock_interruptible(&dev->mutex);
2325 * Filters go to the head of the list, normal handlers
2328 if (handler->filter)
2329 list_add_rcu(&handle->d_node, &dev->h_list);
2331 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2333 mutex_unlock(&dev->mutex);
2336 * Since we are supposed to be called from ->connect()
2337 * which is mutually exclusive with ->disconnect()
2338 * we can't be racing with input_unregister_handle()
2339 * and so separate lock is not needed here.
2341 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2344 handler->start(handle);
2348 EXPORT_SYMBOL(input_register_handle);
2351 * input_unregister_handle - unregister an input handle
2352 * @handle: handle to unregister
2354 * This function removes input handle from device's
2355 * and handler's lists.
2357 * This function is supposed to be called from handler's
2358 * disconnect() method.
2360 void input_unregister_handle(struct input_handle *handle)
2362 struct input_dev *dev = handle->dev;
2364 list_del_rcu(&handle->h_node);
2367 * Take dev->mutex to prevent race with input_release_device().
2369 mutex_lock(&dev->mutex);
2370 list_del_rcu(&handle->d_node);
2371 mutex_unlock(&dev->mutex);
2375 EXPORT_SYMBOL(input_unregister_handle);
2378 * input_get_new_minor - allocates a new input minor number
2379 * @legacy_base: beginning or the legacy range to be searched
2380 * @legacy_num: size of legacy range
2381 * @allow_dynamic: whether we can also take ID from the dynamic range
2383 * This function allocates a new device minor for from input major namespace.
2384 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2385 * parameters and whether ID can be allocated from dynamic range if there are
2386 * no free IDs in legacy range.
2388 int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2392 * This function should be called from input handler's ->connect()
2393 * methods, which are serialized with input_mutex, so no additional
2394 * locking is needed here.
2396 if (legacy_base >= 0) {
2397 int minor = ida_simple_get(&input_ida,
2399 legacy_base + legacy_num,
2401 if (minor >= 0 || !allow_dynamic)
2405 return ida_simple_get(&input_ida,
2406 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2409 EXPORT_SYMBOL(input_get_new_minor);
2412 * input_free_minor - release previously allocated minor
2413 * @minor: minor to be released
2415 * This function releases previously allocated input minor so that it can be
2418 void input_free_minor(unsigned int minor)
2420 ida_simple_remove(&input_ida, minor);
2422 EXPORT_SYMBOL(input_free_minor);
2424 static int __init input_init(void)
2428 err = class_register(&input_class);
2430 pr_err("unable to register input_dev class\n");
2434 err = input_proc_init();
2438 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2439 INPUT_MAX_CHAR_DEVICES, "input");
2441 pr_err("unable to register char major %d", INPUT_MAJOR);
2447 fail2: input_proc_exit();
2448 fail1: class_unregister(&input_class);
2452 static void __exit input_exit(void)
2455 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2456 INPUT_MAX_CHAR_DEVICES);
2457 class_unregister(&input_class);
2460 subsys_initcall(input_init);
2461 module_exit(input_exit);