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 add_input_randomness(vals->type, vals->code, vals->value);
158 /* trigger auto repeat for key events */
159 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
160 for (v = vals; v != vals + count; v++) {
161 if (v->type == EV_KEY && v->value != 2) {
163 input_start_autorepeat(dev, v->code);
165 input_stop_autorepeat(dev);
171 static void input_pass_event(struct input_dev *dev,
172 unsigned int type, unsigned int code, int value)
174 struct input_value vals[] = { { type, code, value } };
176 input_pass_values(dev, vals, ARRAY_SIZE(vals));
180 * Generate software autorepeat event. Note that we take
181 * dev->event_lock here to avoid racing with input_event
182 * which may cause keys get "stuck".
184 static void input_repeat_key(unsigned long data)
186 struct input_dev *dev = (void *) data;
189 spin_lock_irqsave(&dev->event_lock, flags);
191 if (test_bit(dev->repeat_key, dev->key) &&
192 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
193 struct input_value vals[] = {
194 { EV_KEY, dev->repeat_key, 2 },
198 input_pass_values(dev, vals, ARRAY_SIZE(vals));
200 if (dev->rep[REP_PERIOD])
201 mod_timer(&dev->timer, jiffies +
202 msecs_to_jiffies(dev->rep[REP_PERIOD]));
205 spin_unlock_irqrestore(&dev->event_lock, flags);
208 #define INPUT_IGNORE_EVENT 0
209 #define INPUT_PASS_TO_HANDLERS 1
210 #define INPUT_PASS_TO_DEVICE 2
212 #define INPUT_FLUSH 8
213 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
215 static int input_handle_abs_event(struct input_dev *dev,
216 unsigned int code, int *pval)
218 struct input_mt *mt = dev->mt;
222 if (code == ABS_MT_SLOT) {
224 * "Stage" the event; we'll flush it later, when we
225 * get actual touch data.
227 if (mt && *pval >= 0 && *pval < mt->num_slots)
230 return INPUT_IGNORE_EVENT;
233 is_mt_event = input_is_mt_value(code);
236 pold = &dev->absinfo[code].value;
238 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
241 * Bypass filtering for multi-touch events when
242 * not employing slots.
248 *pval = input_defuzz_abs_event(*pval, *pold,
249 dev->absinfo[code].fuzz);
251 return INPUT_IGNORE_EVENT;
256 /* Flush pending "slot" event */
257 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
258 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
259 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
262 return INPUT_PASS_TO_HANDLERS;
265 static int input_get_disposition(struct input_dev *dev,
266 unsigned int type, unsigned int code, int *pval)
268 int disposition = INPUT_IGNORE_EVENT;
276 disposition = INPUT_PASS_TO_ALL;
280 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
283 disposition = INPUT_PASS_TO_HANDLERS;
289 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
291 /* auto-repeat bypasses state updates */
293 disposition = INPUT_PASS_TO_HANDLERS;
297 if (!!test_bit(code, dev->key) != !!value) {
299 __change_bit(code, dev->key);
300 disposition = INPUT_PASS_TO_HANDLERS;
306 if (is_event_supported(code, dev->swbit, SW_MAX) &&
307 !!test_bit(code, dev->sw) != !!value) {
309 __change_bit(code, dev->sw);
310 disposition = INPUT_PASS_TO_HANDLERS;
315 if (is_event_supported(code, dev->absbit, ABS_MAX))
316 disposition = input_handle_abs_event(dev, code, &value);
321 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
322 disposition = INPUT_PASS_TO_HANDLERS;
327 if (is_event_supported(code, dev->mscbit, MSC_MAX))
328 disposition = INPUT_PASS_TO_ALL;
333 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
334 !!test_bit(code, dev->led) != !!value) {
336 __change_bit(code, dev->led);
337 disposition = INPUT_PASS_TO_ALL;
342 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
344 if (!!test_bit(code, dev->snd) != !!value)
345 __change_bit(code, dev->snd);
346 disposition = INPUT_PASS_TO_ALL;
351 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
352 dev->rep[code] = value;
353 disposition = INPUT_PASS_TO_ALL;
359 disposition = INPUT_PASS_TO_ALL;
363 disposition = INPUT_PASS_TO_ALL;
371 static void input_handle_event(struct input_dev *dev,
372 unsigned int type, unsigned int code, int value)
376 disposition = input_get_disposition(dev, type, code, &value);
378 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
379 dev->event(dev, type, code, value);
384 if (disposition & INPUT_PASS_TO_HANDLERS) {
385 struct input_value *v;
387 if (disposition & INPUT_SLOT) {
388 v = &dev->vals[dev->num_vals++];
390 v->code = ABS_MT_SLOT;
391 v->value = dev->mt->slot;
394 v = &dev->vals[dev->num_vals++];
400 if (disposition & INPUT_FLUSH) {
401 if (dev->num_vals >= 2)
402 input_pass_values(dev, dev->vals, dev->num_vals);
404 } else if (dev->num_vals >= dev->max_vals - 2) {
405 dev->vals[dev->num_vals++] = input_value_sync;
406 input_pass_values(dev, dev->vals, dev->num_vals);
413 * input_event() - report new input event
414 * @dev: device that generated the event
415 * @type: type of the event
417 * @value: value of the event
419 * This function should be used by drivers implementing various input
420 * devices to report input events. See also input_inject_event().
422 * NOTE: input_event() may be safely used right after input device was
423 * allocated with input_allocate_device(), even before it is registered
424 * with input_register_device(), but the event will not reach any of the
425 * input handlers. Such early invocation of input_event() may be used
426 * to 'seed' initial state of a switch or initial position of absolute
429 void input_event(struct input_dev *dev,
430 unsigned int type, unsigned int code, int value)
434 if (is_event_supported(type, dev->evbit, EV_MAX)) {
436 spin_lock_irqsave(&dev->event_lock, flags);
437 input_handle_event(dev, type, code, value);
438 spin_unlock_irqrestore(&dev->event_lock, flags);
441 EXPORT_SYMBOL(input_event);
444 * input_inject_event() - send input event from input handler
445 * @handle: input handle to send event through
446 * @type: type of the event
448 * @value: value of the event
450 * Similar to input_event() but will ignore event if device is
451 * "grabbed" and handle injecting event is not the one that owns
454 void input_inject_event(struct input_handle *handle,
455 unsigned int type, unsigned int code, int value)
457 struct input_dev *dev = handle->dev;
458 struct input_handle *grab;
461 if (is_event_supported(type, dev->evbit, EV_MAX)) {
462 spin_lock_irqsave(&dev->event_lock, flags);
465 grab = rcu_dereference(dev->grab);
466 if (!grab || grab == handle)
467 input_handle_event(dev, type, code, value);
470 spin_unlock_irqrestore(&dev->event_lock, flags);
473 EXPORT_SYMBOL(input_inject_event);
476 * input_alloc_absinfo - allocates array of input_absinfo structs
477 * @dev: the input device emitting absolute events
479 * If the absinfo struct the caller asked for is already allocated, this
480 * functions will not do anything.
482 void input_alloc_absinfo(struct input_dev *dev)
485 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
488 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
490 EXPORT_SYMBOL(input_alloc_absinfo);
492 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
493 int min, int max, int fuzz, int flat)
495 struct input_absinfo *absinfo;
497 input_alloc_absinfo(dev);
501 absinfo = &dev->absinfo[axis];
502 absinfo->minimum = min;
503 absinfo->maximum = max;
504 absinfo->fuzz = fuzz;
505 absinfo->flat = flat;
507 __set_bit(EV_ABS, dev->evbit);
508 __set_bit(axis, dev->absbit);
510 EXPORT_SYMBOL(input_set_abs_params);
514 * input_grab_device - grabs device for exclusive use
515 * @handle: input handle that wants to own the device
517 * When a device is grabbed by an input handle all events generated by
518 * the device are delivered only to this handle. Also events injected
519 * by other input handles are ignored while device is grabbed.
521 int input_grab_device(struct input_handle *handle)
523 struct input_dev *dev = handle->dev;
526 retval = mutex_lock_interruptible(&dev->mutex);
535 rcu_assign_pointer(dev->grab, handle);
538 mutex_unlock(&dev->mutex);
541 EXPORT_SYMBOL(input_grab_device);
543 static void __input_release_device(struct input_handle *handle)
545 struct input_dev *dev = handle->dev;
546 struct input_handle *grabber;
548 grabber = rcu_dereference_protected(dev->grab,
549 lockdep_is_held(&dev->mutex));
550 if (grabber == handle) {
551 rcu_assign_pointer(dev->grab, NULL);
552 /* Make sure input_pass_event() notices that grab is gone */
555 list_for_each_entry(handle, &dev->h_list, d_node)
556 if (handle->open && handle->handler->start)
557 handle->handler->start(handle);
562 * input_release_device - release previously grabbed device
563 * @handle: input handle that owns the device
565 * Releases previously grabbed device so that other input handles can
566 * start receiving input events. Upon release all handlers attached
567 * to the device have their start() method called so they have a change
568 * to synchronize device state with the rest of the system.
570 void input_release_device(struct input_handle *handle)
572 struct input_dev *dev = handle->dev;
574 mutex_lock(&dev->mutex);
575 __input_release_device(handle);
576 mutex_unlock(&dev->mutex);
578 EXPORT_SYMBOL(input_release_device);
581 * input_open_device - open input device
582 * @handle: handle through which device is being accessed
584 * This function should be called by input handlers when they
585 * want to start receive events from given input device.
587 int input_open_device(struct input_handle *handle)
589 struct input_dev *dev = handle->dev;
592 retval = mutex_lock_interruptible(&dev->mutex);
596 if (dev->going_away) {
603 if (!dev->users++ && dev->open)
604 retval = dev->open(dev);
608 if (!--handle->open) {
610 * Make sure we are not delivering any more events
611 * through this handle
618 mutex_unlock(&dev->mutex);
621 EXPORT_SYMBOL(input_open_device);
623 int input_flush_device(struct input_handle *handle, struct file *file)
625 struct input_dev *dev = handle->dev;
628 retval = mutex_lock_interruptible(&dev->mutex);
633 retval = dev->flush(dev, file);
635 mutex_unlock(&dev->mutex);
638 EXPORT_SYMBOL(input_flush_device);
641 * input_close_device - close input device
642 * @handle: handle through which device is being accessed
644 * This function should be called by input handlers when they
645 * want to stop receive events from given input device.
647 void input_close_device(struct input_handle *handle)
649 struct input_dev *dev = handle->dev;
651 mutex_lock(&dev->mutex);
653 __input_release_device(handle);
655 if (!--dev->users && dev->close)
658 if (!--handle->open) {
660 * synchronize_rcu() makes sure that input_pass_event()
661 * completed and that no more input events are delivered
662 * through this handle
667 mutex_unlock(&dev->mutex);
669 EXPORT_SYMBOL(input_close_device);
672 * Simulate keyup events for all keys that are marked as pressed.
673 * The function must be called with dev->event_lock held.
675 static void input_dev_release_keys(struct input_dev *dev)
679 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
680 for (code = 0; code <= KEY_MAX; code++) {
681 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
682 __test_and_clear_bit(code, dev->key)) {
683 input_pass_event(dev, EV_KEY, code, 0);
686 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
691 * Prepare device for unregistering
693 static void input_disconnect_device(struct input_dev *dev)
695 struct input_handle *handle;
698 * Mark device as going away. Note that we take dev->mutex here
699 * not to protect access to dev->going_away but rather to ensure
700 * that there are no threads in the middle of input_open_device()
702 mutex_lock(&dev->mutex);
703 dev->going_away = true;
704 mutex_unlock(&dev->mutex);
706 spin_lock_irq(&dev->event_lock);
709 * Simulate keyup events for all pressed keys so that handlers
710 * are not left with "stuck" keys. The driver may continue
711 * generate events even after we done here but they will not
712 * reach any handlers.
714 input_dev_release_keys(dev);
716 list_for_each_entry(handle, &dev->h_list, d_node)
719 spin_unlock_irq(&dev->event_lock);
723 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
724 * @ke: keymap entry containing scancode to be converted.
725 * @scancode: pointer to the location where converted scancode should
728 * This function is used to convert scancode stored in &struct keymap_entry
729 * into scalar form understood by legacy keymap handling methods. These
730 * methods expect scancodes to be represented as 'unsigned int'.
732 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
733 unsigned int *scancode)
737 *scancode = *((u8 *)ke->scancode);
741 *scancode = *((u16 *)ke->scancode);
745 *scancode = *((u32 *)ke->scancode);
754 EXPORT_SYMBOL(input_scancode_to_scalar);
757 * Those routines handle the default case where no [gs]etkeycode() is
758 * defined. In this case, an array indexed by the scancode is used.
761 static unsigned int input_fetch_keycode(struct input_dev *dev,
764 switch (dev->keycodesize) {
766 return ((u8 *)dev->keycode)[index];
769 return ((u16 *)dev->keycode)[index];
772 return ((u32 *)dev->keycode)[index];
776 static int input_default_getkeycode(struct input_dev *dev,
777 struct input_keymap_entry *ke)
782 if (!dev->keycodesize)
785 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
788 error = input_scancode_to_scalar(ke, &index);
793 if (index >= dev->keycodemax)
796 ke->keycode = input_fetch_keycode(dev, index);
798 ke->len = sizeof(index);
799 memcpy(ke->scancode, &index, sizeof(index));
804 static int input_default_setkeycode(struct input_dev *dev,
805 const struct input_keymap_entry *ke,
806 unsigned int *old_keycode)
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 if (dev->keycodesize < sizeof(ke->keycode) &&
827 (ke->keycode >> (dev->keycodesize * 8)))
830 switch (dev->keycodesize) {
832 u8 *k = (u8 *)dev->keycode;
833 *old_keycode = k[index];
834 k[index] = ke->keycode;
838 u16 *k = (u16 *)dev->keycode;
839 *old_keycode = k[index];
840 k[index] = ke->keycode;
844 u32 *k = (u32 *)dev->keycode;
845 *old_keycode = k[index];
846 k[index] = ke->keycode;
851 __clear_bit(*old_keycode, dev->keybit);
852 __set_bit(ke->keycode, dev->keybit);
854 for (i = 0; i < dev->keycodemax; i++) {
855 if (input_fetch_keycode(dev, i) == *old_keycode) {
856 __set_bit(*old_keycode, dev->keybit);
857 break; /* Setting the bit twice is useless, so break */
865 * input_get_keycode - retrieve keycode currently mapped to a given scancode
866 * @dev: input device which keymap is being queried
869 * This function should be called by anyone interested in retrieving current
870 * keymap. Presently evdev handlers use it.
872 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
877 spin_lock_irqsave(&dev->event_lock, flags);
878 retval = dev->getkeycode(dev, ke);
879 spin_unlock_irqrestore(&dev->event_lock, flags);
883 EXPORT_SYMBOL(input_get_keycode);
886 * input_set_keycode - attribute a keycode to a given scancode
887 * @dev: input device which keymap is being updated
888 * @ke: new keymap entry
890 * This function should be called by anyone needing to update current
891 * keymap. Presently keyboard and evdev handlers use it.
893 int input_set_keycode(struct input_dev *dev,
894 const struct input_keymap_entry *ke)
897 unsigned int old_keycode;
900 if (ke->keycode > KEY_MAX)
903 spin_lock_irqsave(&dev->event_lock, flags);
905 retval = dev->setkeycode(dev, ke, &old_keycode);
909 /* Make sure KEY_RESERVED did not get enabled. */
910 __clear_bit(KEY_RESERVED, dev->keybit);
913 * Simulate keyup event if keycode is not present
914 * in the keymap anymore
916 if (test_bit(EV_KEY, dev->evbit) &&
917 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
918 __test_and_clear_bit(old_keycode, dev->key)) {
919 struct input_value vals[] = {
920 { EV_KEY, old_keycode, 0 },
924 input_pass_values(dev, vals, ARRAY_SIZE(vals));
928 spin_unlock_irqrestore(&dev->event_lock, flags);
932 EXPORT_SYMBOL(input_set_keycode);
934 static const struct input_device_id *input_match_device(struct input_handler *handler,
935 struct input_dev *dev)
937 const struct input_device_id *id;
939 for (id = handler->id_table; id->flags || id->driver_info; id++) {
941 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
942 if (id->bustype != dev->id.bustype)
945 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
946 if (id->vendor != dev->id.vendor)
949 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
950 if (id->product != dev->id.product)
953 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
954 if (id->version != dev->id.version)
957 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
960 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
963 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
966 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
969 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
972 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
975 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
978 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
981 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
984 if (!handler->match || handler->match(handler, dev))
991 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
993 const struct input_device_id *id;
996 id = input_match_device(handler, dev);
1000 error = handler->connect(handler, dev, id);
1001 if (error && error != -ENODEV)
1002 pr_err("failed to attach handler %s to device %s, error: %d\n",
1003 handler->name, kobject_name(&dev->dev.kobj), error);
1008 #ifdef CONFIG_COMPAT
1010 static int input_bits_to_string(char *buf, int buf_size,
1011 unsigned long bits, bool skip_empty)
1015 if (INPUT_COMPAT_TEST) {
1016 u32 dword = bits >> 32;
1017 if (dword || !skip_empty)
1018 len += snprintf(buf, buf_size, "%x ", dword);
1020 dword = bits & 0xffffffffUL;
1021 if (dword || !skip_empty || len)
1022 len += snprintf(buf + len, max(buf_size - len, 0),
1025 if (bits || !skip_empty)
1026 len += snprintf(buf, buf_size, "%lx", bits);
1032 #else /* !CONFIG_COMPAT */
1034 static int input_bits_to_string(char *buf, int buf_size,
1035 unsigned long bits, bool skip_empty)
1037 return bits || !skip_empty ?
1038 snprintf(buf, buf_size, "%lx", bits) : 0;
1043 #ifdef CONFIG_PROC_FS
1045 static struct proc_dir_entry *proc_bus_input_dir;
1046 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1047 static int input_devices_state;
1049 static inline void input_wakeup_procfs_readers(void)
1051 input_devices_state++;
1052 wake_up(&input_devices_poll_wait);
1055 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
1057 poll_wait(file, &input_devices_poll_wait, wait);
1058 if (file->f_version != input_devices_state) {
1059 file->f_version = input_devices_state;
1060 return POLLIN | POLLRDNORM;
1066 union input_seq_state {
1069 bool mutex_acquired;
1074 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1076 union input_seq_state *state = (union input_seq_state *)&seq->private;
1079 /* We need to fit into seq->private pointer */
1080 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1082 error = mutex_lock_interruptible(&input_mutex);
1084 state->mutex_acquired = false;
1085 return ERR_PTR(error);
1088 state->mutex_acquired = true;
1090 return seq_list_start(&input_dev_list, *pos);
1093 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1095 return seq_list_next(v, &input_dev_list, pos);
1098 static void input_seq_stop(struct seq_file *seq, void *v)
1100 union input_seq_state *state = (union input_seq_state *)&seq->private;
1102 if (state->mutex_acquired)
1103 mutex_unlock(&input_mutex);
1106 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1107 unsigned long *bitmap, int max)
1110 bool skip_empty = true;
1113 seq_printf(seq, "B: %s=", name);
1115 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1116 if (input_bits_to_string(buf, sizeof(buf),
1117 bitmap[i], skip_empty)) {
1119 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1124 * If no output was produced print a single 0.
1129 seq_putc(seq, '\n');
1132 static int input_devices_seq_show(struct seq_file *seq, void *v)
1134 struct input_dev *dev = container_of(v, struct input_dev, node);
1135 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1136 struct input_handle *handle;
1138 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1139 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1141 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1142 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1143 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1144 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1145 seq_printf(seq, "H: Handlers=");
1147 list_for_each_entry(handle, &dev->h_list, d_node)
1148 seq_printf(seq, "%s ", handle->name);
1149 seq_putc(seq, '\n');
1151 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1153 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1154 if (test_bit(EV_KEY, dev->evbit))
1155 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1156 if (test_bit(EV_REL, dev->evbit))
1157 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1158 if (test_bit(EV_ABS, dev->evbit))
1159 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1160 if (test_bit(EV_MSC, dev->evbit))
1161 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1162 if (test_bit(EV_LED, dev->evbit))
1163 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1164 if (test_bit(EV_SND, dev->evbit))
1165 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1166 if (test_bit(EV_FF, dev->evbit))
1167 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1168 if (test_bit(EV_SW, dev->evbit))
1169 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1171 seq_putc(seq, '\n');
1177 static const struct seq_operations input_devices_seq_ops = {
1178 .start = input_devices_seq_start,
1179 .next = input_devices_seq_next,
1180 .stop = input_seq_stop,
1181 .show = input_devices_seq_show,
1184 static int input_proc_devices_open(struct inode *inode, struct file *file)
1186 return seq_open(file, &input_devices_seq_ops);
1189 static const struct file_operations input_devices_fileops = {
1190 .owner = THIS_MODULE,
1191 .open = input_proc_devices_open,
1192 .poll = input_proc_devices_poll,
1194 .llseek = seq_lseek,
1195 .release = seq_release,
1198 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1200 union input_seq_state *state = (union input_seq_state *)&seq->private;
1203 /* We need to fit into seq->private pointer */
1204 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1206 error = mutex_lock_interruptible(&input_mutex);
1208 state->mutex_acquired = false;
1209 return ERR_PTR(error);
1212 state->mutex_acquired = true;
1215 return seq_list_start(&input_handler_list, *pos);
1218 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1220 union input_seq_state *state = (union input_seq_state *)&seq->private;
1222 state->pos = *pos + 1;
1223 return seq_list_next(v, &input_handler_list, pos);
1226 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1228 struct input_handler *handler = container_of(v, struct input_handler, node);
1229 union input_seq_state *state = (union input_seq_state *)&seq->private;
1231 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1232 if (handler->filter)
1233 seq_puts(seq, " (filter)");
1234 if (handler->legacy_minors)
1235 seq_printf(seq, " Minor=%d", handler->minor);
1236 seq_putc(seq, '\n');
1241 static const struct seq_operations input_handlers_seq_ops = {
1242 .start = input_handlers_seq_start,
1243 .next = input_handlers_seq_next,
1244 .stop = input_seq_stop,
1245 .show = input_handlers_seq_show,
1248 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1250 return seq_open(file, &input_handlers_seq_ops);
1253 static const struct file_operations input_handlers_fileops = {
1254 .owner = THIS_MODULE,
1255 .open = input_proc_handlers_open,
1257 .llseek = seq_lseek,
1258 .release = seq_release,
1261 static int __init input_proc_init(void)
1263 struct proc_dir_entry *entry;
1265 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1266 if (!proc_bus_input_dir)
1269 entry = proc_create("devices", 0, proc_bus_input_dir,
1270 &input_devices_fileops);
1274 entry = proc_create("handlers", 0, proc_bus_input_dir,
1275 &input_handlers_fileops);
1281 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1282 fail1: remove_proc_entry("bus/input", NULL);
1286 static void input_proc_exit(void)
1288 remove_proc_entry("devices", proc_bus_input_dir);
1289 remove_proc_entry("handlers", proc_bus_input_dir);
1290 remove_proc_entry("bus/input", NULL);
1293 #else /* !CONFIG_PROC_FS */
1294 static inline void input_wakeup_procfs_readers(void) { }
1295 static inline int input_proc_init(void) { return 0; }
1296 static inline void input_proc_exit(void) { }
1299 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1300 static ssize_t input_dev_show_##name(struct device *dev, \
1301 struct device_attribute *attr, \
1304 struct input_dev *input_dev = to_input_dev(dev); \
1306 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1307 input_dev->name ? input_dev->name : ""); \
1309 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1311 INPUT_DEV_STRING_ATTR_SHOW(name);
1312 INPUT_DEV_STRING_ATTR_SHOW(phys);
1313 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1315 static int input_print_modalias_bits(char *buf, int size,
1316 char name, unsigned long *bm,
1317 unsigned int min_bit, unsigned int max_bit)
1321 len += snprintf(buf, max(size, 0), "%c", name);
1322 for (i = min_bit; i < max_bit; i++)
1323 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1324 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1328 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1333 len = snprintf(buf, max(size, 0),
1334 "input:b%04Xv%04Xp%04Xe%04X-",
1335 id->id.bustype, id->id.vendor,
1336 id->id.product, id->id.version);
1338 len += input_print_modalias_bits(buf + len, size - len,
1339 'e', id->evbit, 0, EV_MAX);
1340 len += input_print_modalias_bits(buf + len, size - len,
1341 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1342 len += input_print_modalias_bits(buf + len, size - len,
1343 'r', id->relbit, 0, REL_MAX);
1344 len += input_print_modalias_bits(buf + len, size - len,
1345 'a', id->absbit, 0, ABS_MAX);
1346 len += input_print_modalias_bits(buf + len, size - len,
1347 'm', id->mscbit, 0, MSC_MAX);
1348 len += input_print_modalias_bits(buf + len, size - len,
1349 'l', id->ledbit, 0, LED_MAX);
1350 len += input_print_modalias_bits(buf + len, size - len,
1351 's', id->sndbit, 0, SND_MAX);
1352 len += input_print_modalias_bits(buf + len, size - len,
1353 'f', id->ffbit, 0, FF_MAX);
1354 len += input_print_modalias_bits(buf + len, size - len,
1355 'w', id->swbit, 0, SW_MAX);
1358 len += snprintf(buf + len, max(size - len, 0), "\n");
1363 static ssize_t input_dev_show_modalias(struct device *dev,
1364 struct device_attribute *attr,
1367 struct input_dev *id = to_input_dev(dev);
1370 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1372 return min_t(int, len, PAGE_SIZE);
1374 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1376 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1377 int max, int add_cr);
1379 static ssize_t input_dev_show_properties(struct device *dev,
1380 struct device_attribute *attr,
1383 struct input_dev *input_dev = to_input_dev(dev);
1384 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1385 INPUT_PROP_MAX, true);
1386 return min_t(int, len, PAGE_SIZE);
1388 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1390 static struct attribute *input_dev_attrs[] = {
1391 &dev_attr_name.attr,
1392 &dev_attr_phys.attr,
1393 &dev_attr_uniq.attr,
1394 &dev_attr_modalias.attr,
1395 &dev_attr_properties.attr,
1399 static struct attribute_group input_dev_attr_group = {
1400 .attrs = input_dev_attrs,
1403 #define INPUT_DEV_ID_ATTR(name) \
1404 static ssize_t input_dev_show_id_##name(struct device *dev, \
1405 struct device_attribute *attr, \
1408 struct input_dev *input_dev = to_input_dev(dev); \
1409 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1411 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1413 INPUT_DEV_ID_ATTR(bustype);
1414 INPUT_DEV_ID_ATTR(vendor);
1415 INPUT_DEV_ID_ATTR(product);
1416 INPUT_DEV_ID_ATTR(version);
1418 static struct attribute *input_dev_id_attrs[] = {
1419 &dev_attr_bustype.attr,
1420 &dev_attr_vendor.attr,
1421 &dev_attr_product.attr,
1422 &dev_attr_version.attr,
1426 static struct attribute_group input_dev_id_attr_group = {
1428 .attrs = input_dev_id_attrs,
1431 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1432 int max, int add_cr)
1436 bool skip_empty = true;
1438 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1439 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1440 bitmap[i], skip_empty);
1444 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1449 * If no output was produced print a single 0.
1452 len = snprintf(buf, buf_size, "%d", 0);
1455 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1460 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1461 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1462 struct device_attribute *attr, \
1465 struct input_dev *input_dev = to_input_dev(dev); \
1466 int len = input_print_bitmap(buf, PAGE_SIZE, \
1467 input_dev->bm##bit, ev##_MAX, \
1469 return min_t(int, len, PAGE_SIZE); \
1471 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1473 INPUT_DEV_CAP_ATTR(EV, ev);
1474 INPUT_DEV_CAP_ATTR(KEY, key);
1475 INPUT_DEV_CAP_ATTR(REL, rel);
1476 INPUT_DEV_CAP_ATTR(ABS, abs);
1477 INPUT_DEV_CAP_ATTR(MSC, msc);
1478 INPUT_DEV_CAP_ATTR(LED, led);
1479 INPUT_DEV_CAP_ATTR(SND, snd);
1480 INPUT_DEV_CAP_ATTR(FF, ff);
1481 INPUT_DEV_CAP_ATTR(SW, sw);
1483 static struct attribute *input_dev_caps_attrs[] = {
1496 static struct attribute_group input_dev_caps_attr_group = {
1497 .name = "capabilities",
1498 .attrs = input_dev_caps_attrs,
1501 static const struct attribute_group *input_dev_attr_groups[] = {
1502 &input_dev_attr_group,
1503 &input_dev_id_attr_group,
1504 &input_dev_caps_attr_group,
1508 static void input_dev_release(struct device *device)
1510 struct input_dev *dev = to_input_dev(device);
1512 input_ff_destroy(dev);
1513 input_mt_destroy_slots(dev);
1514 kfree(dev->absinfo);
1518 module_put(THIS_MODULE);
1522 * Input uevent interface - loading event handlers based on
1525 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1526 const char *name, unsigned long *bitmap, int max)
1530 if (add_uevent_var(env, "%s", name))
1533 len = input_print_bitmap(&env->buf[env->buflen - 1],
1534 sizeof(env->buf) - env->buflen,
1535 bitmap, max, false);
1536 if (len >= (sizeof(env->buf) - env->buflen))
1543 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1544 struct input_dev *dev)
1548 if (add_uevent_var(env, "MODALIAS="))
1551 len = input_print_modalias(&env->buf[env->buflen - 1],
1552 sizeof(env->buf) - env->buflen,
1554 if (len >= (sizeof(env->buf) - env->buflen))
1561 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1563 int err = add_uevent_var(env, fmt, val); \
1568 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1570 int err = input_add_uevent_bm_var(env, name, bm, max); \
1575 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1577 int err = input_add_uevent_modalias_var(env, dev); \
1582 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1584 struct input_dev *dev = to_input_dev(device);
1586 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1587 dev->id.bustype, dev->id.vendor,
1588 dev->id.product, dev->id.version);
1590 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1592 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1594 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1596 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1598 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1599 if (test_bit(EV_KEY, dev->evbit))
1600 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1601 if (test_bit(EV_REL, dev->evbit))
1602 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1603 if (test_bit(EV_ABS, dev->evbit))
1604 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1605 if (test_bit(EV_MSC, dev->evbit))
1606 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1607 if (test_bit(EV_LED, dev->evbit))
1608 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1609 if (test_bit(EV_SND, dev->evbit))
1610 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1611 if (test_bit(EV_FF, dev->evbit))
1612 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1613 if (test_bit(EV_SW, dev->evbit))
1614 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1616 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1621 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1626 if (!test_bit(EV_##type, dev->evbit)) \
1629 for (i = 0; i < type##_MAX; i++) { \
1630 if (!test_bit(i, dev->bits##bit)) \
1633 active = test_bit(i, dev->bits); \
1634 if (!active && !on) \
1637 dev->event(dev, EV_##type, i, on ? active : 0); \
1641 static void input_dev_toggle(struct input_dev *dev, bool activate)
1646 INPUT_DO_TOGGLE(dev, LED, led, activate);
1647 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1649 if (activate && test_bit(EV_REP, dev->evbit)) {
1650 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1651 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1656 * input_reset_device() - reset/restore the state of input device
1657 * @dev: input device whose state needs to be reset
1659 * This function tries to reset the state of an opened input device and
1660 * bring internal state and state if the hardware in sync with each other.
1661 * We mark all keys as released, restore LED state, repeat rate, etc.
1663 void input_reset_device(struct input_dev *dev)
1665 unsigned long flags;
1667 mutex_lock(&dev->mutex);
1668 spin_lock_irqsave(&dev->event_lock, flags);
1670 input_dev_toggle(dev, true);
1671 input_dev_release_keys(dev);
1673 spin_unlock_irqrestore(&dev->event_lock, flags);
1674 mutex_unlock(&dev->mutex);
1676 EXPORT_SYMBOL(input_reset_device);
1678 #ifdef CONFIG_PM_SLEEP
1679 static int input_dev_suspend(struct device *dev)
1681 struct input_dev *input_dev = to_input_dev(dev);
1683 spin_lock_irq(&input_dev->event_lock);
1686 * Keys that are pressed now are unlikely to be
1687 * still pressed when we resume.
1689 input_dev_release_keys(input_dev);
1691 /* Turn off LEDs and sounds, if any are active. */
1692 input_dev_toggle(input_dev, false);
1694 spin_unlock_irq(&input_dev->event_lock);
1699 static int input_dev_resume(struct device *dev)
1701 struct input_dev *input_dev = to_input_dev(dev);
1703 spin_lock_irq(&input_dev->event_lock);
1705 /* Restore state of LEDs and sounds, if any were active. */
1706 input_dev_toggle(input_dev, true);
1708 spin_unlock_irq(&input_dev->event_lock);
1713 static int input_dev_freeze(struct device *dev)
1715 struct input_dev *input_dev = to_input_dev(dev);
1717 spin_lock_irq(&input_dev->event_lock);
1720 * Keys that are pressed now are unlikely to be
1721 * still pressed when we resume.
1723 input_dev_release_keys(input_dev);
1725 spin_unlock_irq(&input_dev->event_lock);
1730 static int input_dev_poweroff(struct device *dev)
1732 struct input_dev *input_dev = to_input_dev(dev);
1734 spin_lock_irq(&input_dev->event_lock);
1736 /* Turn off LEDs and sounds, if any are active. */
1737 input_dev_toggle(input_dev, false);
1739 spin_unlock_irq(&input_dev->event_lock);
1744 static const struct dev_pm_ops input_dev_pm_ops = {
1745 .suspend = input_dev_suspend,
1746 .resume = input_dev_resume,
1747 .freeze = input_dev_freeze,
1748 .poweroff = input_dev_poweroff,
1749 .restore = input_dev_resume,
1751 #endif /* CONFIG_PM */
1753 static struct device_type input_dev_type = {
1754 .groups = input_dev_attr_groups,
1755 .release = input_dev_release,
1756 .uevent = input_dev_uevent,
1757 #ifdef CONFIG_PM_SLEEP
1758 .pm = &input_dev_pm_ops,
1762 static char *input_devnode(struct device *dev, umode_t *mode)
1764 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1767 struct class input_class = {
1769 .devnode = input_devnode,
1771 EXPORT_SYMBOL_GPL(input_class);
1774 * input_allocate_device - allocate memory for new input device
1776 * Returns prepared struct input_dev or %NULL.
1778 * NOTE: Use input_free_device() to free devices that have not been
1779 * registered; input_unregister_device() should be used for already
1780 * registered devices.
1782 struct input_dev *input_allocate_device(void)
1784 static atomic_t input_no = ATOMIC_INIT(-1);
1785 struct input_dev *dev;
1787 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1789 dev->dev.type = &input_dev_type;
1790 dev->dev.class = &input_class;
1791 device_initialize(&dev->dev);
1792 mutex_init(&dev->mutex);
1793 spin_lock_init(&dev->event_lock);
1794 init_timer(&dev->timer);
1795 INIT_LIST_HEAD(&dev->h_list);
1796 INIT_LIST_HEAD(&dev->node);
1798 dev_set_name(&dev->dev, "input%lu",
1799 (unsigned long)atomic_inc_return(&input_no));
1801 __module_get(THIS_MODULE);
1806 EXPORT_SYMBOL(input_allocate_device);
1808 struct input_devres {
1809 struct input_dev *input;
1812 static int devm_input_device_match(struct device *dev, void *res, void *data)
1814 struct input_devres *devres = res;
1816 return devres->input == data;
1819 static void devm_input_device_release(struct device *dev, void *res)
1821 struct input_devres *devres = res;
1822 struct input_dev *input = devres->input;
1824 dev_dbg(dev, "%s: dropping reference to %s\n",
1825 __func__, dev_name(&input->dev));
1826 input_put_device(input);
1830 * devm_input_allocate_device - allocate managed input device
1831 * @dev: device owning the input device being created
1833 * Returns prepared struct input_dev or %NULL.
1835 * Managed input devices do not need to be explicitly unregistered or
1836 * freed as it will be done automatically when owner device unbinds from
1837 * its driver (or binding fails). Once managed input device is allocated,
1838 * it is ready to be set up and registered in the same fashion as regular
1839 * input device. There are no special devm_input_device_[un]register()
1840 * variants, regular ones work with both managed and unmanaged devices,
1841 * should you need them. In most cases however, managed input device need
1842 * not be explicitly unregistered or freed.
1844 * NOTE: the owner device is set up as parent of input device and users
1845 * should not override it.
1847 struct input_dev *devm_input_allocate_device(struct device *dev)
1849 struct input_dev *input;
1850 struct input_devres *devres;
1852 devres = devres_alloc(devm_input_device_release,
1853 sizeof(struct input_devres), GFP_KERNEL);
1857 input = input_allocate_device();
1859 devres_free(devres);
1863 input->dev.parent = dev;
1864 input->devres_managed = true;
1866 devres->input = input;
1867 devres_add(dev, devres);
1871 EXPORT_SYMBOL(devm_input_allocate_device);
1874 * input_free_device - free memory occupied by input_dev structure
1875 * @dev: input device to free
1877 * This function should only be used if input_register_device()
1878 * was not called yet or if it failed. Once device was registered
1879 * use input_unregister_device() and memory will be freed once last
1880 * reference to the device is dropped.
1882 * Device should be allocated by input_allocate_device().
1884 * NOTE: If there are references to the input device then memory
1885 * will not be freed until last reference is dropped.
1887 void input_free_device(struct input_dev *dev)
1890 if (dev->devres_managed)
1891 WARN_ON(devres_destroy(dev->dev.parent,
1892 devm_input_device_release,
1893 devm_input_device_match,
1895 input_put_device(dev);
1898 EXPORT_SYMBOL(input_free_device);
1901 * input_set_capability - mark device as capable of a certain event
1902 * @dev: device that is capable of emitting or accepting event
1903 * @type: type of the event (EV_KEY, EV_REL, etc...)
1906 * In addition to setting up corresponding bit in appropriate capability
1907 * bitmap the function also adjusts dev->evbit.
1909 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1913 __set_bit(code, dev->keybit);
1917 __set_bit(code, dev->relbit);
1921 input_alloc_absinfo(dev);
1925 __set_bit(code, dev->absbit);
1929 __set_bit(code, dev->mscbit);
1933 __set_bit(code, dev->swbit);
1937 __set_bit(code, dev->ledbit);
1941 __set_bit(code, dev->sndbit);
1945 __set_bit(code, dev->ffbit);
1953 pr_err("input_set_capability: unknown type %u (code %u)\n",
1959 __set_bit(type, dev->evbit);
1961 EXPORT_SYMBOL(input_set_capability);
1963 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1967 unsigned int events;
1970 mt_slots = dev->mt->num_slots;
1971 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1972 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1973 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1974 mt_slots = clamp(mt_slots, 2, 32);
1975 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1981 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1983 if (test_bit(EV_ABS, dev->evbit)) {
1984 for (i = 0; i < ABS_CNT; i++) {
1985 if (test_bit(i, dev->absbit)) {
1986 if (input_is_mt_axis(i))
1994 if (test_bit(EV_REL, dev->evbit)) {
1995 for (i = 0; i < REL_CNT; i++)
1996 if (test_bit(i, dev->relbit))
2000 /* Make room for KEY and MSC events */
2006 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
2008 if (!test_bit(EV_##type, dev->evbit)) \
2009 memset(dev->bits##bit, 0, \
2010 sizeof(dev->bits##bit)); \
2013 static void input_cleanse_bitmasks(struct input_dev *dev)
2015 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2016 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2017 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2018 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2019 INPUT_CLEANSE_BITMASK(dev, LED, led);
2020 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2021 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2022 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2025 static void __input_unregister_device(struct input_dev *dev)
2027 struct input_handle *handle, *next;
2029 input_disconnect_device(dev);
2031 mutex_lock(&input_mutex);
2033 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2034 handle->handler->disconnect(handle);
2035 WARN_ON(!list_empty(&dev->h_list));
2037 del_timer_sync(&dev->timer);
2038 list_del_init(&dev->node);
2040 input_wakeup_procfs_readers();
2042 mutex_unlock(&input_mutex);
2044 device_del(&dev->dev);
2047 static void devm_input_device_unregister(struct device *dev, void *res)
2049 struct input_devres *devres = res;
2050 struct input_dev *input = devres->input;
2052 dev_dbg(dev, "%s: unregistering device %s\n",
2053 __func__, dev_name(&input->dev));
2054 __input_unregister_device(input);
2058 * input_register_device - register device with input core
2059 * @dev: device to be registered
2061 * This function registers device with input core. The device must be
2062 * allocated with input_allocate_device() and all it's capabilities
2063 * set up before registering.
2064 * If function fails the device must be freed with input_free_device().
2065 * Once device has been successfully registered it can be unregistered
2066 * with input_unregister_device(); input_free_device() should not be
2067 * called in this case.
2069 * Note that this function is also used to register managed input devices
2070 * (ones allocated with devm_input_allocate_device()). Such managed input
2071 * devices need not be explicitly unregistered or freed, their tear down
2072 * is controlled by the devres infrastructure. It is also worth noting
2073 * that tear down of managed input devices is internally a 2-step process:
2074 * registered managed input device is first unregistered, but stays in
2075 * memory and can still handle input_event() calls (although events will
2076 * not be delivered anywhere). The freeing of managed input device will
2077 * happen later, when devres stack is unwound to the point where device
2078 * allocation was made.
2080 int input_register_device(struct input_dev *dev)
2082 struct input_devres *devres = NULL;
2083 struct input_handler *handler;
2084 unsigned int packet_size;
2088 if (dev->devres_managed) {
2089 devres = devres_alloc(devm_input_device_unregister,
2090 sizeof(struct input_devres), GFP_KERNEL);
2094 devres->input = dev;
2097 /* Every input device generates EV_SYN/SYN_REPORT events. */
2098 __set_bit(EV_SYN, dev->evbit);
2100 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2101 __clear_bit(KEY_RESERVED, dev->keybit);
2103 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2104 input_cleanse_bitmasks(dev);
2106 packet_size = input_estimate_events_per_packet(dev);
2107 if (dev->hint_events_per_packet < packet_size)
2108 dev->hint_events_per_packet = packet_size;
2110 dev->max_vals = dev->hint_events_per_packet + 2;
2111 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2114 goto err_devres_free;
2118 * If delay and period are pre-set by the driver, then autorepeating
2119 * is handled by the driver itself and we don't do it in input.c.
2121 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
2122 dev->timer.data = (long) dev;
2123 dev->timer.function = input_repeat_key;
2124 dev->rep[REP_DELAY] = 250;
2125 dev->rep[REP_PERIOD] = 33;
2128 if (!dev->getkeycode)
2129 dev->getkeycode = input_default_getkeycode;
2131 if (!dev->setkeycode)
2132 dev->setkeycode = input_default_setkeycode;
2134 error = device_add(&dev->dev);
2138 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2139 pr_info("%s as %s\n",
2140 dev->name ? dev->name : "Unspecified device",
2141 path ? path : "N/A");
2144 error = mutex_lock_interruptible(&input_mutex);
2146 goto err_device_del;
2148 list_add_tail(&dev->node, &input_dev_list);
2150 list_for_each_entry(handler, &input_handler_list, node)
2151 input_attach_handler(dev, handler);
2153 input_wakeup_procfs_readers();
2155 mutex_unlock(&input_mutex);
2157 if (dev->devres_managed) {
2158 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2159 __func__, dev_name(&dev->dev));
2160 devres_add(dev->dev.parent, devres);
2165 device_del(&dev->dev);
2170 devres_free(devres);
2173 EXPORT_SYMBOL(input_register_device);
2176 * input_unregister_device - unregister previously registered device
2177 * @dev: device to be unregistered
2179 * This function unregisters an input device. Once device is unregistered
2180 * the caller should not try to access it as it may get freed at any moment.
2182 void input_unregister_device(struct input_dev *dev)
2184 if (dev->devres_managed) {
2185 WARN_ON(devres_destroy(dev->dev.parent,
2186 devm_input_device_unregister,
2187 devm_input_device_match,
2189 __input_unregister_device(dev);
2191 * We do not do input_put_device() here because it will be done
2192 * when 2nd devres fires up.
2195 __input_unregister_device(dev);
2196 input_put_device(dev);
2199 EXPORT_SYMBOL(input_unregister_device);
2202 * input_register_handler - register a new input handler
2203 * @handler: handler to be registered
2205 * This function registers a new input handler (interface) for input
2206 * devices in the system and attaches it to all input devices that
2207 * are compatible with the handler.
2209 int input_register_handler(struct input_handler *handler)
2211 struct input_dev *dev;
2214 error = mutex_lock_interruptible(&input_mutex);
2218 INIT_LIST_HEAD(&handler->h_list);
2220 list_add_tail(&handler->node, &input_handler_list);
2222 list_for_each_entry(dev, &input_dev_list, node)
2223 input_attach_handler(dev, handler);
2225 input_wakeup_procfs_readers();
2227 mutex_unlock(&input_mutex);
2230 EXPORT_SYMBOL(input_register_handler);
2233 * input_unregister_handler - unregisters an input handler
2234 * @handler: handler to be unregistered
2236 * This function disconnects a handler from its input devices and
2237 * removes it from lists of known handlers.
2239 void input_unregister_handler(struct input_handler *handler)
2241 struct input_handle *handle, *next;
2243 mutex_lock(&input_mutex);
2245 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2246 handler->disconnect(handle);
2247 WARN_ON(!list_empty(&handler->h_list));
2249 list_del_init(&handler->node);
2251 input_wakeup_procfs_readers();
2253 mutex_unlock(&input_mutex);
2255 EXPORT_SYMBOL(input_unregister_handler);
2258 * input_handler_for_each_handle - handle iterator
2259 * @handler: input handler to iterate
2260 * @data: data for the callback
2261 * @fn: function to be called for each handle
2263 * Iterate over @bus's list of devices, and call @fn for each, passing
2264 * it @data and stop when @fn returns a non-zero value. The function is
2265 * using RCU to traverse the list and therefore may be using in atomic
2266 * contexts. The @fn callback is invoked from RCU critical section and
2267 * thus must not sleep.
2269 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2270 int (*fn)(struct input_handle *, void *))
2272 struct input_handle *handle;
2277 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2278 retval = fn(handle, data);
2287 EXPORT_SYMBOL(input_handler_for_each_handle);
2290 * input_register_handle - register a new input handle
2291 * @handle: handle to register
2293 * This function puts a new input handle onto device's
2294 * and handler's lists so that events can flow through
2295 * it once it is opened using input_open_device().
2297 * This function is supposed to be called from handler's
2300 int input_register_handle(struct input_handle *handle)
2302 struct input_handler *handler = handle->handler;
2303 struct input_dev *dev = handle->dev;
2307 * We take dev->mutex here to prevent race with
2308 * input_release_device().
2310 error = mutex_lock_interruptible(&dev->mutex);
2315 * Filters go to the head of the list, normal handlers
2318 if (handler->filter)
2319 list_add_rcu(&handle->d_node, &dev->h_list);
2321 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2323 mutex_unlock(&dev->mutex);
2326 * Since we are supposed to be called from ->connect()
2327 * which is mutually exclusive with ->disconnect()
2328 * we can't be racing with input_unregister_handle()
2329 * and so separate lock is not needed here.
2331 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2334 handler->start(handle);
2338 EXPORT_SYMBOL(input_register_handle);
2341 * input_unregister_handle - unregister an input handle
2342 * @handle: handle to unregister
2344 * This function removes input handle from device's
2345 * and handler's lists.
2347 * This function is supposed to be called from handler's
2348 * disconnect() method.
2350 void input_unregister_handle(struct input_handle *handle)
2352 struct input_dev *dev = handle->dev;
2354 list_del_rcu(&handle->h_node);
2357 * Take dev->mutex to prevent race with input_release_device().
2359 mutex_lock(&dev->mutex);
2360 list_del_rcu(&handle->d_node);
2361 mutex_unlock(&dev->mutex);
2365 EXPORT_SYMBOL(input_unregister_handle);
2368 * input_get_new_minor - allocates a new input minor number
2369 * @legacy_base: beginning or the legacy range to be searched
2370 * @legacy_num: size of legacy range
2371 * @allow_dynamic: whether we can also take ID from the dynamic range
2373 * This function allocates a new device minor for from input major namespace.
2374 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2375 * parameters and whether ID can be allocated from dynamic range if there are
2376 * no free IDs in legacy range.
2378 int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2382 * This function should be called from input handler's ->connect()
2383 * methods, which are serialized with input_mutex, so no additional
2384 * locking is needed here.
2386 if (legacy_base >= 0) {
2387 int minor = ida_simple_get(&input_ida,
2389 legacy_base + legacy_num,
2391 if (minor >= 0 || !allow_dynamic)
2395 return ida_simple_get(&input_ida,
2396 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2399 EXPORT_SYMBOL(input_get_new_minor);
2402 * input_free_minor - release previously allocated minor
2403 * @minor: minor to be released
2405 * This function releases previously allocated input minor so that it can be
2408 void input_free_minor(unsigned int minor)
2410 ida_simple_remove(&input_ida, minor);
2412 EXPORT_SYMBOL(input_free_minor);
2414 static int __init input_init(void)
2418 err = class_register(&input_class);
2420 pr_err("unable to register input_dev class\n");
2424 err = input_proc_init();
2428 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2429 INPUT_MAX_CHAR_DEVICES, "input");
2431 pr_err("unable to register char major %d", INPUT_MAJOR);
2437 fail2: input_proc_exit();
2438 fail1: class_unregister(&input_class);
2442 static void __exit input_exit(void)
2445 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2446 INPUT_MAX_CHAR_DEVICES);
2447 class_unregister(&input_class);
2450 subsys_initcall(input_init);
2451 module_exit(input_exit);