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 for (v
= vals
; v
!= vals
+ count
; v
++) {
104 if (handler
->filter
&&
105 handler
->filter(handle
, v
->type
, v
->code
, v
->value
))
117 handler
->events(handle
, vals
, count
);
118 else if (handler
->event
)
119 for (v
= vals
; v
!= end
; v
++)
120 handler
->event(handle
, v
->type
, v
->code
, v
->value
);
126 * Pass values first through all filters and then, if event has not been
127 * filtered out, through all open handles. This function is called with
128 * dev->event_lock held and interrupts disabled.
130 static void input_pass_values(struct input_dev
*dev
,
131 struct input_value
*vals
, unsigned int count
)
133 struct input_handle
*handle
;
134 struct input_value
*v
;
141 handle
= rcu_dereference(dev
->grab
);
143 count
= input_to_handler(handle
, vals
, count
);
145 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
)
147 count
= input_to_handler(handle
, vals
, count
);
152 add_input_randomness(vals
->type
, vals
->code
, vals
->value
);
154 /* trigger auto repeat for key events */
155 for (v
= vals
; v
!= vals
+ count
; v
++) {
156 if (v
->type
== EV_KEY
&& v
->value
!= 2) {
158 input_start_autorepeat(dev
, v
->code
);
160 input_stop_autorepeat(dev
);
165 static void input_pass_event(struct input_dev
*dev
,
166 unsigned int type
, unsigned int code
, int value
)
168 struct input_value vals
[] = { { type
, code
, value
} };
170 input_pass_values(dev
, vals
, ARRAY_SIZE(vals
));
174 * Generate software autorepeat event. Note that we take
175 * dev->event_lock here to avoid racing with input_event
176 * which may cause keys get "stuck".
178 static void input_repeat_key(unsigned long data
)
180 struct input_dev
*dev
= (void *) data
;
183 spin_lock_irqsave(&dev
->event_lock
, flags
);
185 if (test_bit(dev
->repeat_key
, dev
->key
) &&
186 is_event_supported(dev
->repeat_key
, dev
->keybit
, KEY_MAX
)) {
187 struct input_value vals
[] = {
188 { EV_KEY
, dev
->repeat_key
, 2 },
192 input_pass_values(dev
, vals
, ARRAY_SIZE(vals
));
194 if (dev
->rep
[REP_PERIOD
])
195 mod_timer(&dev
->timer
, jiffies
+
196 msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
199 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
202 #define INPUT_IGNORE_EVENT 0
203 #define INPUT_PASS_TO_HANDLERS 1
204 #define INPUT_PASS_TO_DEVICE 2
206 #define INPUT_FLUSH 8
207 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
209 static int input_handle_abs_event(struct input_dev
*dev
,
210 unsigned int code
, int *pval
)
212 struct input_mt
*mt
= dev
->mt
;
216 if (code
== ABS_MT_SLOT
) {
218 * "Stage" the event; we'll flush it later, when we
219 * get actual touch data.
221 if (mt
&& *pval
>= 0 && *pval
< mt
->num_slots
)
224 return INPUT_IGNORE_EVENT
;
227 is_mt_event
= input_is_mt_value(code
);
230 pold
= &dev
->absinfo
[code
].value
;
232 pold
= &mt
->slots
[mt
->slot
].abs
[code
- ABS_MT_FIRST
];
235 * Bypass filtering for multi-touch events when
236 * not employing slots.
242 *pval
= input_defuzz_abs_event(*pval
, *pold
,
243 dev
->absinfo
[code
].fuzz
);
245 return INPUT_IGNORE_EVENT
;
250 /* Flush pending "slot" event */
251 if (is_mt_event
&& mt
&& mt
->slot
!= input_abs_get_val(dev
, ABS_MT_SLOT
)) {
252 input_abs_set_val(dev
, ABS_MT_SLOT
, mt
->slot
);
253 return INPUT_PASS_TO_HANDLERS
| INPUT_SLOT
;
256 return INPUT_PASS_TO_HANDLERS
;
259 static int input_get_disposition(struct input_dev
*dev
,
260 unsigned int type
, unsigned int code
, int *pval
)
262 int disposition
= INPUT_IGNORE_EVENT
;
270 disposition
= INPUT_PASS_TO_ALL
;
274 disposition
= INPUT_PASS_TO_HANDLERS
| INPUT_FLUSH
;
277 disposition
= INPUT_PASS_TO_HANDLERS
;
283 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
)) {
285 /* auto-repeat bypasses state updates */
287 disposition
= INPUT_PASS_TO_HANDLERS
;
291 if (!!test_bit(code
, dev
->key
) != !!value
) {
293 __change_bit(code
, dev
->key
);
294 disposition
= INPUT_PASS_TO_HANDLERS
;
300 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
301 !!test_bit(code
, dev
->sw
) != !!value
) {
303 __change_bit(code
, dev
->sw
);
304 disposition
= INPUT_PASS_TO_HANDLERS
;
309 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
))
310 disposition
= input_handle_abs_event(dev
, code
, &value
);
315 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
316 disposition
= INPUT_PASS_TO_HANDLERS
;
321 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
322 disposition
= INPUT_PASS_TO_ALL
;
327 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
328 !!test_bit(code
, dev
->led
) != !!value
) {
330 __change_bit(code
, dev
->led
);
331 disposition
= INPUT_PASS_TO_ALL
;
336 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
338 if (!!test_bit(code
, dev
->snd
) != !!value
)
339 __change_bit(code
, dev
->snd
);
340 disposition
= INPUT_PASS_TO_ALL
;
345 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
346 dev
->rep
[code
] = value
;
347 disposition
= INPUT_PASS_TO_ALL
;
353 disposition
= INPUT_PASS_TO_ALL
;
357 disposition
= INPUT_PASS_TO_ALL
;
365 static void input_handle_event(struct input_dev
*dev
,
366 unsigned int type
, unsigned int code
, int value
)
370 disposition
= input_get_disposition(dev
, type
, code
, &value
);
372 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
373 dev
->event(dev
, type
, code
, value
);
378 if (disposition
& INPUT_PASS_TO_HANDLERS
) {
379 struct input_value
*v
;
381 if (disposition
& INPUT_SLOT
) {
382 v
= &dev
->vals
[dev
->num_vals
++];
384 v
->code
= ABS_MT_SLOT
;
385 v
->value
= dev
->mt
->slot
;
388 v
= &dev
->vals
[dev
->num_vals
++];
394 if (disposition
& INPUT_FLUSH
) {
395 if (dev
->num_vals
>= 2)
396 input_pass_values(dev
, dev
->vals
, dev
->num_vals
);
398 } else if (dev
->num_vals
>= dev
->max_vals
- 2) {
399 dev
->vals
[dev
->num_vals
++] = input_value_sync
;
400 input_pass_values(dev
, dev
->vals
, dev
->num_vals
);
407 * input_event() - report new input event
408 * @dev: device that generated the event
409 * @type: type of the event
411 * @value: value of the event
413 * This function should be used by drivers implementing various input
414 * devices to report input events. See also input_inject_event().
416 * NOTE: input_event() may be safely used right after input device was
417 * allocated with input_allocate_device(), even before it is registered
418 * with input_register_device(), but the event will not reach any of the
419 * input handlers. Such early invocation of input_event() may be used
420 * to 'seed' initial state of a switch or initial position of absolute
423 void input_event(struct input_dev
*dev
,
424 unsigned int type
, unsigned int code
, int value
)
428 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
430 spin_lock_irqsave(&dev
->event_lock
, flags
);
431 input_handle_event(dev
, type
, code
, value
);
432 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
435 EXPORT_SYMBOL(input_event
);
438 * input_inject_event() - send input event from input handler
439 * @handle: input handle to send event through
440 * @type: type of the event
442 * @value: value of the event
444 * Similar to input_event() but will ignore event if device is
445 * "grabbed" and handle injecting event is not the one that owns
448 void input_inject_event(struct input_handle
*handle
,
449 unsigned int type
, unsigned int code
, int value
)
451 struct input_dev
*dev
= handle
->dev
;
452 struct input_handle
*grab
;
455 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
456 spin_lock_irqsave(&dev
->event_lock
, flags
);
459 grab
= rcu_dereference(dev
->grab
);
460 if (!grab
|| grab
== handle
)
461 input_handle_event(dev
, type
, code
, value
);
464 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
467 EXPORT_SYMBOL(input_inject_event
);
470 * input_alloc_absinfo - allocates array of input_absinfo structs
471 * @dev: the input device emitting absolute events
473 * If the absinfo struct the caller asked for is already allocated, this
474 * functions will not do anything.
476 void input_alloc_absinfo(struct input_dev
*dev
)
479 dev
->absinfo
= kcalloc(ABS_CNT
, sizeof(struct input_absinfo
),
482 WARN(!dev
->absinfo
, "%s(): kcalloc() failed?\n", __func__
);
484 EXPORT_SYMBOL(input_alloc_absinfo
);
486 void input_set_abs_params(struct input_dev
*dev
, unsigned int axis
,
487 int min
, int max
, int fuzz
, int flat
)
489 struct input_absinfo
*absinfo
;
491 input_alloc_absinfo(dev
);
495 absinfo
= &dev
->absinfo
[axis
];
496 absinfo
->minimum
= min
;
497 absinfo
->maximum
= max
;
498 absinfo
->fuzz
= fuzz
;
499 absinfo
->flat
= flat
;
501 dev
->absbit
[BIT_WORD(axis
)] |= BIT_MASK(axis
);
503 EXPORT_SYMBOL(input_set_abs_params
);
507 * input_grab_device - grabs device for exclusive use
508 * @handle: input handle that wants to own the device
510 * When a device is grabbed by an input handle all events generated by
511 * the device are delivered only to this handle. Also events injected
512 * by other input handles are ignored while device is grabbed.
514 int input_grab_device(struct input_handle
*handle
)
516 struct input_dev
*dev
= handle
->dev
;
519 retval
= mutex_lock_interruptible(&dev
->mutex
);
528 rcu_assign_pointer(dev
->grab
, handle
);
531 mutex_unlock(&dev
->mutex
);
534 EXPORT_SYMBOL(input_grab_device
);
536 static void __input_release_device(struct input_handle
*handle
)
538 struct input_dev
*dev
= handle
->dev
;
539 struct input_handle
*grabber
;
541 grabber
= rcu_dereference_protected(dev
->grab
,
542 lockdep_is_held(&dev
->mutex
));
543 if (grabber
== handle
) {
544 rcu_assign_pointer(dev
->grab
, NULL
);
545 /* Make sure input_pass_event() notices that grab is gone */
548 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
549 if (handle
->open
&& handle
->handler
->start
)
550 handle
->handler
->start(handle
);
555 * input_release_device - release previously grabbed device
556 * @handle: input handle that owns the device
558 * Releases previously grabbed device so that other input handles can
559 * start receiving input events. Upon release all handlers attached
560 * to the device have their start() method called so they have a change
561 * to synchronize device state with the rest of the system.
563 void input_release_device(struct input_handle
*handle
)
565 struct input_dev
*dev
= handle
->dev
;
567 mutex_lock(&dev
->mutex
);
568 __input_release_device(handle
);
569 mutex_unlock(&dev
->mutex
);
571 EXPORT_SYMBOL(input_release_device
);
574 * input_open_device - open input device
575 * @handle: handle through which device is being accessed
577 * This function should be called by input handlers when they
578 * want to start receive events from given input device.
580 int input_open_device(struct input_handle
*handle
)
582 struct input_dev
*dev
= handle
->dev
;
585 retval
= mutex_lock_interruptible(&dev
->mutex
);
589 if (dev
->going_away
) {
596 if (!dev
->users
++ && dev
->open
)
597 retval
= dev
->open(dev
);
601 if (!--handle
->open
) {
603 * Make sure we are not delivering any more events
604 * through this handle
611 mutex_unlock(&dev
->mutex
);
614 EXPORT_SYMBOL(input_open_device
);
616 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
618 struct input_dev
*dev
= handle
->dev
;
621 retval
= mutex_lock_interruptible(&dev
->mutex
);
626 retval
= dev
->flush(dev
, file
);
628 mutex_unlock(&dev
->mutex
);
631 EXPORT_SYMBOL(input_flush_device
);
634 * input_close_device - close input device
635 * @handle: handle through which device is being accessed
637 * This function should be called by input handlers when they
638 * want to stop receive events from given input device.
640 void input_close_device(struct input_handle
*handle
)
642 struct input_dev
*dev
= handle
->dev
;
644 mutex_lock(&dev
->mutex
);
646 __input_release_device(handle
);
648 if (!--dev
->users
&& dev
->close
)
651 if (!--handle
->open
) {
653 * synchronize_rcu() makes sure that input_pass_event()
654 * completed and that no more input events are delivered
655 * through this handle
660 mutex_unlock(&dev
->mutex
);
662 EXPORT_SYMBOL(input_close_device
);
665 * Simulate keyup events for all keys that are marked as pressed.
666 * The function must be called with dev->event_lock held.
668 static void input_dev_release_keys(struct input_dev
*dev
)
672 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
673 /* fixed long press key is interrupted */
675 for (code
= 0; code
<= KEY_MAX
; code
++) {
676 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
677 __test_and_clear_bit(code
, dev
->key
)) {
678 input_pass_event(dev
, EV_KEY
, code
, 0);
682 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
687 * Prepare device for unregistering
689 static void input_disconnect_device(struct input_dev
*dev
)
691 struct input_handle
*handle
;
694 * Mark device as going away. Note that we take dev->mutex here
695 * not to protect access to dev->going_away but rather to ensure
696 * that there are no threads in the middle of input_open_device()
698 mutex_lock(&dev
->mutex
);
699 dev
->going_away
= true;
700 mutex_unlock(&dev
->mutex
);
702 spin_lock_irq(&dev
->event_lock
);
705 * Simulate keyup events for all pressed keys so that handlers
706 * are not left with "stuck" keys. The driver may continue
707 * generate events even after we done here but they will not
708 * reach any handlers.
710 input_dev_release_keys(dev
);
712 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
715 spin_unlock_irq(&dev
->event_lock
);
719 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
720 * @ke: keymap entry containing scancode to be converted.
721 * @scancode: pointer to the location where converted scancode should
724 * This function is used to convert scancode stored in &struct keymap_entry
725 * into scalar form understood by legacy keymap handling methods. These
726 * methods expect scancodes to be represented as 'unsigned int'.
728 int input_scancode_to_scalar(const struct input_keymap_entry
*ke
,
729 unsigned int *scancode
)
733 *scancode
= *((u8
*)ke
->scancode
);
737 *scancode
= *((u16
*)ke
->scancode
);
741 *scancode
= *((u32
*)ke
->scancode
);
750 EXPORT_SYMBOL(input_scancode_to_scalar
);
753 * Those routines handle the default case where no [gs]etkeycode() is
754 * defined. In this case, an array indexed by the scancode is used.
757 static unsigned int input_fetch_keycode(struct input_dev
*dev
,
760 switch (dev
->keycodesize
) {
762 return ((u8
*)dev
->keycode
)[index
];
765 return ((u16
*)dev
->keycode
)[index
];
768 return ((u32
*)dev
->keycode
)[index
];
772 static int input_default_getkeycode(struct input_dev
*dev
,
773 struct input_keymap_entry
*ke
)
778 if (!dev
->keycodesize
)
781 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
)
784 error
= input_scancode_to_scalar(ke
, &index
);
789 if (index
>= dev
->keycodemax
)
792 ke
->keycode
= input_fetch_keycode(dev
, index
);
794 ke
->len
= sizeof(index
);
795 memcpy(ke
->scancode
, &index
, sizeof(index
));
800 static int input_default_setkeycode(struct input_dev
*dev
,
801 const struct input_keymap_entry
*ke
,
802 unsigned int *old_keycode
)
808 if (!dev
->keycodesize
)
811 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
) {
814 error
= input_scancode_to_scalar(ke
, &index
);
819 if (index
>= dev
->keycodemax
)
822 if (dev
->keycodesize
< sizeof(ke
->keycode
) &&
823 (ke
->keycode
>> (dev
->keycodesize
* 8)))
826 switch (dev
->keycodesize
) {
828 u8
*k
= (u8
*)dev
->keycode
;
829 *old_keycode
= k
[index
];
830 k
[index
] = ke
->keycode
;
834 u16
*k
= (u16
*)dev
->keycode
;
835 *old_keycode
= k
[index
];
836 k
[index
] = ke
->keycode
;
840 u32
*k
= (u32
*)dev
->keycode
;
841 *old_keycode
= k
[index
];
842 k
[index
] = ke
->keycode
;
847 __clear_bit(*old_keycode
, dev
->keybit
);
848 __set_bit(ke
->keycode
, dev
->keybit
);
850 for (i
= 0; i
< dev
->keycodemax
; i
++) {
851 if (input_fetch_keycode(dev
, i
) == *old_keycode
) {
852 __set_bit(*old_keycode
, dev
->keybit
);
853 break; /* Setting the bit twice is useless, so break */
861 * input_get_keycode - retrieve keycode currently mapped to a given scancode
862 * @dev: input device which keymap is being queried
865 * This function should be called by anyone interested in retrieving current
866 * keymap. Presently evdev handlers use it.
868 int input_get_keycode(struct input_dev
*dev
, struct input_keymap_entry
*ke
)
873 spin_lock_irqsave(&dev
->event_lock
, flags
);
874 retval
= dev
->getkeycode(dev
, ke
);
875 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
879 EXPORT_SYMBOL(input_get_keycode
);
882 * input_set_keycode - attribute a keycode to a given scancode
883 * @dev: input device which keymap is being updated
884 * @ke: new keymap entry
886 * This function should be called by anyone needing to update current
887 * keymap. Presently keyboard and evdev handlers use it.
889 int input_set_keycode(struct input_dev
*dev
,
890 const struct input_keymap_entry
*ke
)
893 unsigned int old_keycode
;
896 if (ke
->keycode
> KEY_MAX
)
899 spin_lock_irqsave(&dev
->event_lock
, flags
);
901 retval
= dev
->setkeycode(dev
, ke
, &old_keycode
);
905 /* Make sure KEY_RESERVED did not get enabled. */
906 __clear_bit(KEY_RESERVED
, dev
->keybit
);
909 * Simulate keyup event if keycode is not present
910 * in the keymap anymore
912 if (test_bit(EV_KEY
, dev
->evbit
) &&
913 !is_event_supported(old_keycode
, dev
->keybit
, KEY_MAX
) &&
914 __test_and_clear_bit(old_keycode
, dev
->key
)) {
915 struct input_value vals
[] = {
916 { EV_KEY
, old_keycode
, 0 },
920 input_pass_values(dev
, vals
, ARRAY_SIZE(vals
));
924 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
928 EXPORT_SYMBOL(input_set_keycode
);
930 static const struct input_device_id
*input_match_device(struct input_handler
*handler
,
931 struct input_dev
*dev
)
933 const struct input_device_id
*id
;
935 for (id
= handler
->id_table
; id
->flags
|| id
->driver_info
; id
++) {
937 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
938 if (id
->bustype
!= dev
->id
.bustype
)
941 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
942 if (id
->vendor
!= dev
->id
.vendor
)
945 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
946 if (id
->product
!= dev
->id
.product
)
949 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
950 if (id
->version
!= dev
->id
.version
)
953 if (!bitmap_subset(id
->evbit
, dev
->evbit
, EV_MAX
))
956 if (!bitmap_subset(id
->keybit
, dev
->keybit
, KEY_MAX
))
959 if (!bitmap_subset(id
->relbit
, dev
->relbit
, REL_MAX
))
962 if (!bitmap_subset(id
->absbit
, dev
->absbit
, ABS_MAX
))
965 if (!bitmap_subset(id
->mscbit
, dev
->mscbit
, MSC_MAX
))
968 if (!bitmap_subset(id
->ledbit
, dev
->ledbit
, LED_MAX
))
971 if (!bitmap_subset(id
->sndbit
, dev
->sndbit
, SND_MAX
))
974 if (!bitmap_subset(id
->ffbit
, dev
->ffbit
, FF_MAX
))
977 if (!bitmap_subset(id
->swbit
, dev
->swbit
, SW_MAX
))
980 if (!handler
->match
|| handler
->match(handler
, dev
))
987 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
989 const struct input_device_id
*id
;
992 id
= input_match_device(handler
, dev
);
996 error
= handler
->connect(handler
, dev
, id
);
997 if (error
&& error
!= -ENODEV
)
998 pr_err("failed to attach handler %s to device %s, error: %d\n",
999 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
1004 #ifdef CONFIG_COMPAT
1006 static int input_bits_to_string(char *buf
, int buf_size
,
1007 unsigned long bits
, bool skip_empty
)
1011 if (INPUT_COMPAT_TEST
) {
1012 u32 dword
= bits
>> 32;
1013 if (dword
|| !skip_empty
)
1014 len
+= snprintf(buf
, buf_size
, "%x ", dword
);
1016 dword
= bits
& 0xffffffffUL
;
1017 if (dword
|| !skip_empty
|| len
)
1018 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
1021 if (bits
|| !skip_empty
)
1022 len
+= snprintf(buf
, buf_size
, "%lx", bits
);
1028 #else /* !CONFIG_COMPAT */
1030 static int input_bits_to_string(char *buf
, int buf_size
,
1031 unsigned long bits
, bool skip_empty
)
1033 return bits
|| !skip_empty
?
1034 snprintf(buf
, buf_size
, "%lx", bits
) : 0;
1039 #ifdef CONFIG_PROC_FS
1041 static struct proc_dir_entry
*proc_bus_input_dir
;
1042 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
1043 static int input_devices_state
;
1045 static inline void input_wakeup_procfs_readers(void)
1047 input_devices_state
++;
1048 wake_up(&input_devices_poll_wait
);
1051 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
1053 poll_wait(file
, &input_devices_poll_wait
, wait
);
1054 if (file
->f_version
!= input_devices_state
) {
1055 file
->f_version
= input_devices_state
;
1056 return POLLIN
| POLLRDNORM
;
1062 union input_seq_state
{
1065 bool mutex_acquired
;
1070 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1072 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1075 /* We need to fit into seq->private pointer */
1076 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1078 error
= mutex_lock_interruptible(&input_mutex
);
1080 state
->mutex_acquired
= false;
1081 return ERR_PTR(error
);
1084 state
->mutex_acquired
= true;
1086 return seq_list_start(&input_dev_list
, *pos
);
1089 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1091 return seq_list_next(v
, &input_dev_list
, pos
);
1094 static void input_seq_stop(struct seq_file
*seq
, void *v
)
1096 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1098 if (state
->mutex_acquired
)
1099 mutex_unlock(&input_mutex
);
1102 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
1103 unsigned long *bitmap
, int max
)
1106 bool skip_empty
= true;
1109 seq_printf(seq
, "B: %s=", name
);
1111 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1112 if (input_bits_to_string(buf
, sizeof(buf
),
1113 bitmap
[i
], skip_empty
)) {
1115 seq_printf(seq
, "%s%s", buf
, i
> 0 ? " " : "");
1120 * If no output was produced print a single 0.
1125 seq_putc(seq
, '\n');
1128 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
1130 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
1131 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1132 struct input_handle
*handle
;
1134 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1135 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
1137 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
1138 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
1139 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
1140 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
1141 seq_printf(seq
, "H: Handlers=");
1143 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
1144 seq_printf(seq
, "%s ", handle
->name
);
1145 seq_putc(seq
, '\n');
1147 input_seq_print_bitmap(seq
, "PROP", dev
->propbit
, INPUT_PROP_MAX
);
1149 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
1150 if (test_bit(EV_KEY
, dev
->evbit
))
1151 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
1152 if (test_bit(EV_REL
, dev
->evbit
))
1153 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
1154 if (test_bit(EV_ABS
, dev
->evbit
))
1155 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
1156 if (test_bit(EV_MSC
, dev
->evbit
))
1157 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
1158 if (test_bit(EV_LED
, dev
->evbit
))
1159 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
1160 if (test_bit(EV_SND
, dev
->evbit
))
1161 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
1162 if (test_bit(EV_FF
, dev
->evbit
))
1163 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
1164 if (test_bit(EV_SW
, dev
->evbit
))
1165 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
1167 seq_putc(seq
, '\n');
1173 static const struct seq_operations input_devices_seq_ops
= {
1174 .start
= input_devices_seq_start
,
1175 .next
= input_devices_seq_next
,
1176 .stop
= input_seq_stop
,
1177 .show
= input_devices_seq_show
,
1180 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
1182 return seq_open(file
, &input_devices_seq_ops
);
1185 static const struct file_operations input_devices_fileops
= {
1186 .owner
= THIS_MODULE
,
1187 .open
= input_proc_devices_open
,
1188 .poll
= input_proc_devices_poll
,
1190 .llseek
= seq_lseek
,
1191 .release
= seq_release
,
1194 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1196 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1199 /* We need to fit into seq->private pointer */
1200 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1202 error
= mutex_lock_interruptible(&input_mutex
);
1204 state
->mutex_acquired
= false;
1205 return ERR_PTR(error
);
1208 state
->mutex_acquired
= true;
1211 return seq_list_start(&input_handler_list
, *pos
);
1214 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1216 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1218 state
->pos
= *pos
+ 1;
1219 return seq_list_next(v
, &input_handler_list
, pos
);
1222 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
1224 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
1225 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1227 seq_printf(seq
, "N: Number=%u Name=%s", state
->pos
, handler
->name
);
1228 if (handler
->filter
)
1229 seq_puts(seq
, " (filter)");
1230 if (handler
->legacy_minors
)
1231 seq_printf(seq
, " Minor=%d", handler
->minor
);
1232 seq_putc(seq
, '\n');
1237 static const struct seq_operations input_handlers_seq_ops
= {
1238 .start
= input_handlers_seq_start
,
1239 .next
= input_handlers_seq_next
,
1240 .stop
= input_seq_stop
,
1241 .show
= input_handlers_seq_show
,
1244 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
1246 return seq_open(file
, &input_handlers_seq_ops
);
1249 static const struct file_operations input_handlers_fileops
= {
1250 .owner
= THIS_MODULE
,
1251 .open
= input_proc_handlers_open
,
1253 .llseek
= seq_lseek
,
1254 .release
= seq_release
,
1257 static int __init
input_proc_init(void)
1259 struct proc_dir_entry
*entry
;
1261 proc_bus_input_dir
= proc_mkdir("bus/input", NULL
);
1262 if (!proc_bus_input_dir
)
1265 entry
= proc_create("devices", 0, proc_bus_input_dir
,
1266 &input_devices_fileops
);
1270 entry
= proc_create("handlers", 0, proc_bus_input_dir
,
1271 &input_handlers_fileops
);
1277 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
1278 fail1
: remove_proc_entry("bus/input", NULL
);
1282 static void input_proc_exit(void)
1284 remove_proc_entry("devices", proc_bus_input_dir
);
1285 remove_proc_entry("handlers", proc_bus_input_dir
);
1286 remove_proc_entry("bus/input", NULL
);
1289 #else /* !CONFIG_PROC_FS */
1290 static inline void input_wakeup_procfs_readers(void) { }
1291 static inline int input_proc_init(void) { return 0; }
1292 static inline void input_proc_exit(void) { }
1295 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1296 static ssize_t input_dev_show_##name(struct device *dev, \
1297 struct device_attribute *attr, \
1300 struct input_dev *input_dev = to_input_dev(dev); \
1302 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1303 input_dev->name ? input_dev->name : ""); \
1305 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1307 INPUT_DEV_STRING_ATTR_SHOW(name
);
1308 INPUT_DEV_STRING_ATTR_SHOW(phys
);
1309 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
1311 static int input_print_modalias_bits(char *buf
, int size
,
1312 char name
, unsigned long *bm
,
1313 unsigned int min_bit
, unsigned int max_bit
)
1317 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
1318 for (i
= min_bit
; i
< max_bit
; i
++)
1319 if (bm
[BIT_WORD(i
)] & BIT_MASK(i
))
1320 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
1324 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
1329 len
= snprintf(buf
, max(size
, 0),
1330 "input:b%04Xv%04Xp%04Xe%04X-",
1331 id
->id
.bustype
, id
->id
.vendor
,
1332 id
->id
.product
, id
->id
.version
);
1334 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1335 'e', id
->evbit
, 0, EV_MAX
);
1336 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1337 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
1338 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1339 'r', id
->relbit
, 0, REL_MAX
);
1340 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1341 'a', id
->absbit
, 0, ABS_MAX
);
1342 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1343 'm', id
->mscbit
, 0, MSC_MAX
);
1344 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1345 'l', id
->ledbit
, 0, LED_MAX
);
1346 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1347 's', id
->sndbit
, 0, SND_MAX
);
1348 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1349 'f', id
->ffbit
, 0, FF_MAX
);
1350 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1351 'w', id
->swbit
, 0, SW_MAX
);
1354 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
1359 static ssize_t
input_dev_show_modalias(struct device
*dev
,
1360 struct device_attribute
*attr
,
1363 struct input_dev
*id
= to_input_dev(dev
);
1366 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
1368 return min_t(int, len
, PAGE_SIZE
);
1370 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
1372 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1373 int max
, int add_cr
);
1375 static ssize_t
input_dev_show_properties(struct device
*dev
,
1376 struct device_attribute
*attr
,
1379 struct input_dev
*input_dev
= to_input_dev(dev
);
1380 int len
= input_print_bitmap(buf
, PAGE_SIZE
, input_dev
->propbit
,
1381 INPUT_PROP_MAX
, true);
1382 return min_t(int, len
, PAGE_SIZE
);
1384 static DEVICE_ATTR(properties
, S_IRUGO
, input_dev_show_properties
, NULL
);
1386 static struct attribute
*input_dev_attrs
[] = {
1387 &dev_attr_name
.attr
,
1388 &dev_attr_phys
.attr
,
1389 &dev_attr_uniq
.attr
,
1390 &dev_attr_modalias
.attr
,
1391 &dev_attr_properties
.attr
,
1395 static struct attribute_group input_dev_attr_group
= {
1396 .attrs
= input_dev_attrs
,
1399 #define INPUT_DEV_ID_ATTR(name) \
1400 static ssize_t input_dev_show_id_##name(struct device *dev, \
1401 struct device_attribute *attr, \
1404 struct input_dev *input_dev = to_input_dev(dev); \
1405 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1407 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1409 INPUT_DEV_ID_ATTR(bustype
);
1410 INPUT_DEV_ID_ATTR(vendor
);
1411 INPUT_DEV_ID_ATTR(product
);
1412 INPUT_DEV_ID_ATTR(version
);
1414 static struct attribute
*input_dev_id_attrs
[] = {
1415 &dev_attr_bustype
.attr
,
1416 &dev_attr_vendor
.attr
,
1417 &dev_attr_product
.attr
,
1418 &dev_attr_version
.attr
,
1422 static struct attribute_group input_dev_id_attr_group
= {
1424 .attrs
= input_dev_id_attrs
,
1427 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1428 int max
, int add_cr
)
1432 bool skip_empty
= true;
1434 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1435 len
+= input_bits_to_string(buf
+ len
, max(buf_size
- len
, 0),
1436 bitmap
[i
], skip_empty
);
1440 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), " ");
1445 * If no output was produced print a single 0.
1448 len
= snprintf(buf
, buf_size
, "%d", 0);
1451 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1456 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1457 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1458 struct device_attribute *attr, \
1461 struct input_dev *input_dev = to_input_dev(dev); \
1462 int len = input_print_bitmap(buf, PAGE_SIZE, \
1463 input_dev->bm##bit, ev##_MAX, \
1465 return min_t(int, len, PAGE_SIZE); \
1467 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1469 INPUT_DEV_CAP_ATTR(EV
, ev
);
1470 INPUT_DEV_CAP_ATTR(KEY
, key
);
1471 INPUT_DEV_CAP_ATTR(REL
, rel
);
1472 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1473 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1474 INPUT_DEV_CAP_ATTR(LED
, led
);
1475 INPUT_DEV_CAP_ATTR(SND
, snd
);
1476 INPUT_DEV_CAP_ATTR(FF
, ff
);
1477 INPUT_DEV_CAP_ATTR(SW
, sw
);
1479 static struct attribute
*input_dev_caps_attrs
[] = {
1492 static struct attribute_group input_dev_caps_attr_group
= {
1493 .name
= "capabilities",
1494 .attrs
= input_dev_caps_attrs
,
1497 static const struct attribute_group
*input_dev_attr_groups
[] = {
1498 &input_dev_attr_group
,
1499 &input_dev_id_attr_group
,
1500 &input_dev_caps_attr_group
,
1504 static void input_dev_release(struct device
*device
)
1506 struct input_dev
*dev
= to_input_dev(device
);
1508 input_ff_destroy(dev
);
1509 input_mt_destroy_slots(dev
);
1510 kfree(dev
->absinfo
);
1514 module_put(THIS_MODULE
);
1518 * Input uevent interface - loading event handlers based on
1521 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1522 const char *name
, unsigned long *bitmap
, int max
)
1526 if (add_uevent_var(env
, "%s", name
))
1529 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1530 sizeof(env
->buf
) - env
->buflen
,
1531 bitmap
, max
, false);
1532 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1539 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1540 struct input_dev
*dev
)
1544 if (add_uevent_var(env
, "MODALIAS="))
1547 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1548 sizeof(env
->buf
) - env
->buflen
,
1550 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1557 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1559 int err = add_uevent_var(env, fmt, val); \
1564 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1566 int err = input_add_uevent_bm_var(env, name, bm, max); \
1571 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1573 int err = input_add_uevent_modalias_var(env, dev); \
1578 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1580 struct input_dev
*dev
= to_input_dev(device
);
1582 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1583 dev
->id
.bustype
, dev
->id
.vendor
,
1584 dev
->id
.product
, dev
->id
.version
);
1586 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1588 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1590 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1592 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev
->propbit
, INPUT_PROP_MAX
);
1594 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1595 if (test_bit(EV_KEY
, dev
->evbit
))
1596 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1597 if (test_bit(EV_REL
, dev
->evbit
))
1598 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1599 if (test_bit(EV_ABS
, dev
->evbit
))
1600 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1601 if (test_bit(EV_MSC
, dev
->evbit
))
1602 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1603 if (test_bit(EV_LED
, dev
->evbit
))
1604 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1605 if (test_bit(EV_SND
, dev
->evbit
))
1606 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1607 if (test_bit(EV_FF
, dev
->evbit
))
1608 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1609 if (test_bit(EV_SW
, dev
->evbit
))
1610 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1612 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1617 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1622 if (!test_bit(EV_##type, dev->evbit)) \
1625 for (i = 0; i < type##_MAX; i++) { \
1626 if (!test_bit(i, dev->bits##bit)) \
1629 active = test_bit(i, dev->bits); \
1630 if (!active && !on) \
1633 dev->event(dev, EV_##type, i, on ? active : 0); \
1637 static void input_dev_toggle(struct input_dev
*dev
, bool activate
)
1642 INPUT_DO_TOGGLE(dev
, LED
, led
, activate
);
1643 INPUT_DO_TOGGLE(dev
, SND
, snd
, activate
);
1645 if (activate
&& test_bit(EV_REP
, dev
->evbit
)) {
1646 dev
->event(dev
, EV_REP
, REP_PERIOD
, dev
->rep
[REP_PERIOD
]);
1647 dev
->event(dev
, EV_REP
, REP_DELAY
, dev
->rep
[REP_DELAY
]);
1652 * input_reset_device() - reset/restore the state of input device
1653 * @dev: input device whose state needs to be reset
1655 * This function tries to reset the state of an opened input device and
1656 * bring internal state and state if the hardware in sync with each other.
1657 * We mark all keys as released, restore LED state, repeat rate, etc.
1659 void input_reset_device(struct input_dev
*dev
)
1661 mutex_lock(&dev
->mutex
);
1664 input_dev_toggle(dev
, true);
1667 * Keys that have been pressed at suspend time are unlikely
1668 * to be still pressed when we resume.
1670 spin_lock_irq(&dev
->event_lock
);
1671 input_dev_release_keys(dev
);
1672 spin_unlock_irq(&dev
->event_lock
);
1675 mutex_unlock(&dev
->mutex
);
1677 EXPORT_SYMBOL(input_reset_device
);
1680 static int input_dev_suspend(struct device
*dev
)
1682 struct input_dev
*input_dev
= to_input_dev(dev
);
1684 mutex_lock(&input_dev
->mutex
);
1686 if (input_dev
->users
)
1687 input_dev_toggle(input_dev
, false);
1689 mutex_unlock(&input_dev
->mutex
);
1694 static int input_dev_resume(struct device
*dev
)
1696 struct input_dev
*input_dev
= to_input_dev(dev
);
1698 input_reset_device(input_dev
);
1703 static const struct dev_pm_ops input_dev_pm_ops
= {
1704 .suspend
= input_dev_suspend
,
1705 .resume
= input_dev_resume
,
1706 .poweroff
= input_dev_suspend
,
1707 .restore
= input_dev_resume
,
1709 #endif /* CONFIG_PM */
1711 static struct device_type input_dev_type
= {
1712 .groups
= input_dev_attr_groups
,
1713 .release
= input_dev_release
,
1714 .uevent
= input_dev_uevent
,
1716 .pm
= &input_dev_pm_ops
,
1720 static char *input_devnode(struct device
*dev
, umode_t
*mode
)
1722 return kasprintf(GFP_KERNEL
, "input/%s", dev_name(dev
));
1725 struct class input_class
= {
1727 .devnode
= input_devnode
,
1729 EXPORT_SYMBOL_GPL(input_class
);
1732 * input_allocate_device - allocate memory for new input device
1734 * Returns prepared struct input_dev or %NULL.
1736 * NOTE: Use input_free_device() to free devices that have not been
1737 * registered; input_unregister_device() should be used for already
1738 * registered devices.
1740 struct input_dev
*input_allocate_device(void)
1742 struct input_dev
*dev
;
1744 dev
= kzalloc(sizeof(struct input_dev
), GFP_KERNEL
);
1746 dev
->dev
.type
= &input_dev_type
;
1747 dev
->dev
.class = &input_class
;
1748 device_initialize(&dev
->dev
);
1749 mutex_init(&dev
->mutex
);
1750 spin_lock_init(&dev
->event_lock
);
1751 INIT_LIST_HEAD(&dev
->h_list
);
1752 INIT_LIST_HEAD(&dev
->node
);
1754 __module_get(THIS_MODULE
);
1759 EXPORT_SYMBOL(input_allocate_device
);
1761 struct input_devres
{
1762 struct input_dev
*input
;
1765 static int devm_input_device_match(struct device
*dev
, void *res
, void *data
)
1767 struct input_devres
*devres
= res
;
1769 return devres
->input
== data
;
1772 static void devm_input_device_release(struct device
*dev
, void *res
)
1774 struct input_devres
*devres
= res
;
1775 struct input_dev
*input
= devres
->input
;
1777 dev_dbg(dev
, "%s: dropping reference to %s\n",
1778 __func__
, dev_name(&input
->dev
));
1779 input_put_device(input
);
1783 * devm_input_allocate_device - allocate managed input device
1784 * @dev: device owning the input device being created
1786 * Returns prepared struct input_dev or %NULL.
1788 * Managed input devices do not need to be explicitly unregistered or
1789 * freed as it will be done automatically when owner device unbinds from
1790 * its driver (or binding fails). Once managed input device is allocated,
1791 * it is ready to be set up and registered in the same fashion as regular
1792 * input device. There are no special devm_input_device_[un]register()
1793 * variants, regular ones work with both managed and unmanaged devices,
1794 * should you need them. In most cases however, managed input device need
1795 * not be explicitly unregistered or freed.
1797 * NOTE: the owner device is set up as parent of input device and users
1798 * should not override it.
1800 struct input_dev
*devm_input_allocate_device(struct device
*dev
)
1802 struct input_dev
*input
;
1803 struct input_devres
*devres
;
1805 devres
= devres_alloc(devm_input_device_release
,
1806 sizeof(struct input_devres
), GFP_KERNEL
);
1810 input
= input_allocate_device();
1812 devres_free(devres
);
1816 input
->dev
.parent
= dev
;
1817 input
->devres_managed
= true;
1819 devres
->input
= input
;
1820 devres_add(dev
, devres
);
1824 EXPORT_SYMBOL(devm_input_allocate_device
);
1827 * input_free_device - free memory occupied by input_dev structure
1828 * @dev: input device to free
1830 * This function should only be used if input_register_device()
1831 * was not called yet or if it failed. Once device was registered
1832 * use input_unregister_device() and memory will be freed once last
1833 * reference to the device is dropped.
1835 * Device should be allocated by input_allocate_device().
1837 * NOTE: If there are references to the input device then memory
1838 * will not be freed until last reference is dropped.
1840 void input_free_device(struct input_dev
*dev
)
1843 if (dev
->devres_managed
)
1844 WARN_ON(devres_destroy(dev
->dev
.parent
,
1845 devm_input_device_release
,
1846 devm_input_device_match
,
1848 input_put_device(dev
);
1851 EXPORT_SYMBOL(input_free_device
);
1854 * input_set_capability - mark device as capable of a certain event
1855 * @dev: device that is capable of emitting or accepting event
1856 * @type: type of the event (EV_KEY, EV_REL, etc...)
1859 * In addition to setting up corresponding bit in appropriate capability
1860 * bitmap the function also adjusts dev->evbit.
1862 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1866 __set_bit(code
, dev
->keybit
);
1870 __set_bit(code
, dev
->relbit
);
1874 input_alloc_absinfo(dev
);
1878 __set_bit(code
, dev
->absbit
);
1882 __set_bit(code
, dev
->mscbit
);
1886 __set_bit(code
, dev
->swbit
);
1890 __set_bit(code
, dev
->ledbit
);
1894 __set_bit(code
, dev
->sndbit
);
1898 __set_bit(code
, dev
->ffbit
);
1906 pr_err("input_set_capability: unknown type %u (code %u)\n",
1912 __set_bit(type
, dev
->evbit
);
1914 EXPORT_SYMBOL(input_set_capability
);
1916 static unsigned int input_estimate_events_per_packet(struct input_dev
*dev
)
1920 unsigned int events
;
1923 mt_slots
= dev
->mt
->num_slots
;
1924 } else if (test_bit(ABS_MT_TRACKING_ID
, dev
->absbit
)) {
1925 mt_slots
= dev
->absinfo
[ABS_MT_TRACKING_ID
].maximum
-
1926 dev
->absinfo
[ABS_MT_TRACKING_ID
].minimum
+ 1,
1927 mt_slots
= clamp(mt_slots
, 2, 32);
1928 } else if (test_bit(ABS_MT_POSITION_X
, dev
->absbit
)) {
1934 events
= mt_slots
+ 1; /* count SYN_MT_REPORT and SYN_REPORT */
1936 for (i
= 0; i
< ABS_CNT
; i
++) {
1937 if (test_bit(i
, dev
->absbit
)) {
1938 if (input_is_mt_axis(i
))
1945 for (i
= 0; i
< REL_CNT
; i
++)
1946 if (test_bit(i
, dev
->relbit
))
1949 /* Make room for KEY and MSC events */
1955 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1957 if (!test_bit(EV_##type, dev->evbit)) \
1958 memset(dev->bits##bit, 0, \
1959 sizeof(dev->bits##bit)); \
1962 static void input_cleanse_bitmasks(struct input_dev
*dev
)
1964 INPUT_CLEANSE_BITMASK(dev
, KEY
, key
);
1965 INPUT_CLEANSE_BITMASK(dev
, REL
, rel
);
1966 INPUT_CLEANSE_BITMASK(dev
, ABS
, abs
);
1967 INPUT_CLEANSE_BITMASK(dev
, MSC
, msc
);
1968 INPUT_CLEANSE_BITMASK(dev
, LED
, led
);
1969 INPUT_CLEANSE_BITMASK(dev
, SND
, snd
);
1970 INPUT_CLEANSE_BITMASK(dev
, FF
, ff
);
1971 INPUT_CLEANSE_BITMASK(dev
, SW
, sw
);
1974 static void __input_unregister_device(struct input_dev
*dev
)
1976 struct input_handle
*handle
, *next
;
1978 input_disconnect_device(dev
);
1980 mutex_lock(&input_mutex
);
1982 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1983 handle
->handler
->disconnect(handle
);
1984 WARN_ON(!list_empty(&dev
->h_list
));
1986 del_timer_sync(&dev
->timer
);
1987 list_del_init(&dev
->node
);
1989 input_wakeup_procfs_readers();
1991 mutex_unlock(&input_mutex
);
1993 device_del(&dev
->dev
);
1996 static void devm_input_device_unregister(struct device
*dev
, void *res
)
1998 struct input_devres
*devres
= res
;
1999 struct input_dev
*input
= devres
->input
;
2001 dev_dbg(dev
, "%s: unregistering device %s\n",
2002 __func__
, dev_name(&input
->dev
));
2003 __input_unregister_device(input
);
2007 * input_register_device - register device with input core
2008 * @dev: device to be registered
2010 * This function registers device with input core. The device must be
2011 * allocated with input_allocate_device() and all it's capabilities
2012 * set up before registering.
2013 * If function fails the device must be freed with input_free_device().
2014 * Once device has been successfully registered it can be unregistered
2015 * with input_unregister_device(); input_free_device() should not be
2016 * called in this case.
2018 * Note that this function is also used to register managed input devices
2019 * (ones allocated with devm_input_allocate_device()). Such managed input
2020 * devices need not be explicitly unregistered or freed, their tear down
2021 * is controlled by the devres infrastructure. It is also worth noting
2022 * that tear down of managed input devices is internally a 2-step process:
2023 * registered managed input device is first unregistered, but stays in
2024 * memory and can still handle input_event() calls (although events will
2025 * not be delivered anywhere). The freeing of managed input device will
2026 * happen later, when devres stack is unwound to the point where device
2027 * allocation was made.
2029 int input_register_device(struct input_dev
*dev
)
2031 static atomic_t input_no
= ATOMIC_INIT(0);
2032 struct input_devres
*devres
= NULL
;
2033 struct input_handler
*handler
;
2034 unsigned int packet_size
;
2038 if (dev
->devres_managed
) {
2039 devres
= devres_alloc(devm_input_device_unregister
,
2040 sizeof(struct input_devres
), GFP_KERNEL
);
2044 devres
->input
= dev
;
2047 /* Every input device generates EV_SYN/SYN_REPORT events. */
2048 __set_bit(EV_SYN
, dev
->evbit
);
2050 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2051 __clear_bit(KEY_RESERVED
, dev
->keybit
);
2053 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2054 input_cleanse_bitmasks(dev
);
2056 packet_size
= input_estimate_events_per_packet(dev
);
2057 if (dev
->hint_events_per_packet
< packet_size
)
2058 dev
->hint_events_per_packet
= packet_size
;
2060 dev
->max_vals
= max(dev
->hint_events_per_packet
, packet_size
) + 2;
2061 dev
->vals
= kcalloc(dev
->max_vals
, sizeof(*dev
->vals
), GFP_KERNEL
);
2064 goto err_devres_free
;
2068 * If delay and period are pre-set by the driver, then autorepeating
2069 * is handled by the driver itself and we don't do it in input.c.
2071 init_timer(&dev
->timer
);
2072 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
2073 dev
->timer
.data
= (long) dev
;
2074 dev
->timer
.function
= input_repeat_key
;
2075 dev
->rep
[REP_DELAY
] = 250;
2076 dev
->rep
[REP_PERIOD
] = 33;
2079 if (!dev
->getkeycode
)
2080 dev
->getkeycode
= input_default_getkeycode
;
2082 if (!dev
->setkeycode
)
2083 dev
->setkeycode
= input_default_setkeycode
;
2085 dev_set_name(&dev
->dev
, "input%ld",
2086 (unsigned long) atomic_inc_return(&input_no
) - 1);
2088 error
= device_add(&dev
->dev
);
2092 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
2093 pr_info("%s as %s\n",
2094 dev
->name
? dev
->name
: "Unspecified device",
2095 path
? path
: "N/A");
2098 error
= mutex_lock_interruptible(&input_mutex
);
2100 goto err_device_del
;
2102 list_add_tail(&dev
->node
, &input_dev_list
);
2104 list_for_each_entry(handler
, &input_handler_list
, node
)
2105 input_attach_handler(dev
, handler
);
2107 input_wakeup_procfs_readers();
2109 mutex_unlock(&input_mutex
);
2111 if (dev
->devres_managed
) {
2112 dev_dbg(dev
->dev
.parent
, "%s: registering %s with devres.\n",
2113 __func__
, dev_name(&dev
->dev
));
2114 devres_add(dev
->dev
.parent
, devres
);
2119 device_del(&dev
->dev
);
2124 devres_free(devres
);
2127 EXPORT_SYMBOL(input_register_device
);
2130 * input_unregister_device - unregister previously registered device
2131 * @dev: device to be unregistered
2133 * This function unregisters an input device. Once device is unregistered
2134 * the caller should not try to access it as it may get freed at any moment.
2136 void input_unregister_device(struct input_dev
*dev
)
2138 if (dev
->devres_managed
) {
2139 WARN_ON(devres_destroy(dev
->dev
.parent
,
2140 devm_input_device_unregister
,
2141 devm_input_device_match
,
2143 __input_unregister_device(dev
);
2145 * We do not do input_put_device() here because it will be done
2146 * when 2nd devres fires up.
2149 __input_unregister_device(dev
);
2150 input_put_device(dev
);
2153 EXPORT_SYMBOL(input_unregister_device
);
2156 * input_register_handler - register a new input handler
2157 * @handler: handler to be registered
2159 * This function registers a new input handler (interface) for input
2160 * devices in the system and attaches it to all input devices that
2161 * are compatible with the handler.
2163 int input_register_handler(struct input_handler
*handler
)
2165 struct input_dev
*dev
;
2168 error
= mutex_lock_interruptible(&input_mutex
);
2172 INIT_LIST_HEAD(&handler
->h_list
);
2174 list_add_tail(&handler
->node
, &input_handler_list
);
2176 list_for_each_entry(dev
, &input_dev_list
, node
)
2177 input_attach_handler(dev
, handler
);
2179 input_wakeup_procfs_readers();
2181 mutex_unlock(&input_mutex
);
2184 EXPORT_SYMBOL(input_register_handler
);
2187 * input_unregister_handler - unregisters an input handler
2188 * @handler: handler to be unregistered
2190 * This function disconnects a handler from its input devices and
2191 * removes it from lists of known handlers.
2193 void input_unregister_handler(struct input_handler
*handler
)
2195 struct input_handle
*handle
, *next
;
2197 mutex_lock(&input_mutex
);
2199 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
2200 handler
->disconnect(handle
);
2201 WARN_ON(!list_empty(&handler
->h_list
));
2203 list_del_init(&handler
->node
);
2205 input_wakeup_procfs_readers();
2207 mutex_unlock(&input_mutex
);
2209 EXPORT_SYMBOL(input_unregister_handler
);
2212 * input_handler_for_each_handle - handle iterator
2213 * @handler: input handler to iterate
2214 * @data: data for the callback
2215 * @fn: function to be called for each handle
2217 * Iterate over @bus's list of devices, and call @fn for each, passing
2218 * it @data and stop when @fn returns a non-zero value. The function is
2219 * using RCU to traverse the list and therefore may be usind in atonic
2220 * contexts. The @fn callback is invoked from RCU critical section and
2221 * thus must not sleep.
2223 int input_handler_for_each_handle(struct input_handler
*handler
, void *data
,
2224 int (*fn
)(struct input_handle
*, void *))
2226 struct input_handle
*handle
;
2231 list_for_each_entry_rcu(handle
, &handler
->h_list
, h_node
) {
2232 retval
= fn(handle
, data
);
2241 EXPORT_SYMBOL(input_handler_for_each_handle
);
2244 * input_register_handle - register a new input handle
2245 * @handle: handle to register
2247 * This function puts a new input handle onto device's
2248 * and handler's lists so that events can flow through
2249 * it once it is opened using input_open_device().
2251 * This function is supposed to be called from handler's
2254 int input_register_handle(struct input_handle
*handle
)
2256 struct input_handler
*handler
= handle
->handler
;
2257 struct input_dev
*dev
= handle
->dev
;
2261 * We take dev->mutex here to prevent race with
2262 * input_release_device().
2264 error
= mutex_lock_interruptible(&dev
->mutex
);
2269 * Filters go to the head of the list, normal handlers
2272 if (handler
->filter
)
2273 list_add_rcu(&handle
->d_node
, &dev
->h_list
);
2275 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
2277 mutex_unlock(&dev
->mutex
);
2280 * Since we are supposed to be called from ->connect()
2281 * which is mutually exclusive with ->disconnect()
2282 * we can't be racing with input_unregister_handle()
2283 * and so separate lock is not needed here.
2285 list_add_tail_rcu(&handle
->h_node
, &handler
->h_list
);
2288 handler
->start(handle
);
2292 EXPORT_SYMBOL(input_register_handle
);
2295 * input_unregister_handle - unregister an input handle
2296 * @handle: handle to unregister
2298 * This function removes input handle from device's
2299 * and handler's lists.
2301 * This function is supposed to be called from handler's
2302 * disconnect() method.
2304 void input_unregister_handle(struct input_handle
*handle
)
2306 struct input_dev
*dev
= handle
->dev
;
2308 list_del_rcu(&handle
->h_node
);
2311 * Take dev->mutex to prevent race with input_release_device().
2313 mutex_lock(&dev
->mutex
);
2314 list_del_rcu(&handle
->d_node
);
2315 mutex_unlock(&dev
->mutex
);
2319 EXPORT_SYMBOL(input_unregister_handle
);
2322 * input_get_new_minor - allocates a new input minor number
2323 * @legacy_base: beginning or the legacy range to be searched
2324 * @legacy_num: size of legacy range
2325 * @allow_dynamic: whether we can also take ID from the dynamic range
2327 * This function allocates a new device minor for from input major namespace.
2328 * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2329 * parameters and whether ID can be allocated from dynamic range if there are
2330 * no free IDs in legacy range.
2332 int input_get_new_minor(int legacy_base
, unsigned int legacy_num
,
2336 * This function should be called from input handler's ->connect()
2337 * methods, which are serialized with input_mutex, so no additional
2338 * locking is needed here.
2340 if (legacy_base
>= 0) {
2341 int minor
= ida_simple_get(&input_ida
,
2343 legacy_base
+ legacy_num
,
2345 if (minor
>= 0 || !allow_dynamic
)
2349 return ida_simple_get(&input_ida
,
2350 INPUT_FIRST_DYNAMIC_DEV
, INPUT_MAX_CHAR_DEVICES
,
2353 EXPORT_SYMBOL(input_get_new_minor
);
2356 * input_free_minor - release previously allocated minor
2357 * @minor: minor to be released
2359 * This function releases previously allocated input minor so that it can be
2362 void input_free_minor(unsigned int minor
)
2364 ida_simple_remove(&input_ida
, minor
);
2366 EXPORT_SYMBOL(input_free_minor
);
2368 static int __init
input_init(void)
2372 err
= class_register(&input_class
);
2374 pr_err("unable to register input_dev class\n");
2378 err
= input_proc_init();
2382 err
= register_chrdev_region(MKDEV(INPUT_MAJOR
, 0),
2383 INPUT_MAX_CHAR_DEVICES
, "input");
2385 pr_err("unable to register char major %d", INPUT_MAJOR
);
2391 fail2
: input_proc_exit();
2392 fail1
: class_unregister(&input_class
);
2396 static void __exit
input_exit(void)
2399 unregister_chrdev_region(MKDEV(INPUT_MAJOR
, 0),
2400 INPUT_MAX_CHAR_DEVICES
);
2401 class_unregister(&input_class
);
2404 subsys_initcall(input_init
);
2405 module_exit(input_exit
);