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 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/input/mt.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/random.h>
19 #include <linux/major.h>
20 #include <linux/proc_fs.h>
21 #include <linux/sched.h>
22 #include <linux/seq_file.h>
23 #include <linux/poll.h>
24 #include <linux/device.h>
25 #include <linux/mutex.h>
26 #include <linux/rcupdate.h>
27 #include <linux/smp_lock.h>
28 #include "input-compat.h"
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
31 MODULE_DESCRIPTION("Input core");
32 MODULE_LICENSE("GPL");
34 #define INPUT_DEVICES 256
36 static LIST_HEAD(input_dev_list
);
37 static LIST_HEAD(input_handler_list
);
40 * input_mutex protects access to both input_dev_list and input_handler_list.
41 * This also causes input_[un]register_device and input_[un]register_handler
42 * be mutually exclusive which simplifies locking in drivers implementing
45 static DEFINE_MUTEX(input_mutex
);
47 static struct input_handler
*input_table
[8];
49 static inline int is_event_supported(unsigned int code
,
50 unsigned long *bm
, unsigned int max
)
52 return code
<= max
&& test_bit(code
, bm
);
55 static int input_defuzz_abs_event(int value
, int old_val
, int fuzz
)
58 if (value
> old_val
- fuzz
/ 2 && value
< old_val
+ fuzz
/ 2)
61 if (value
> old_val
- fuzz
&& value
< old_val
+ fuzz
)
62 return (old_val
* 3 + value
) / 4;
64 if (value
> old_val
- fuzz
* 2 && value
< old_val
+ fuzz
* 2)
65 return (old_val
+ value
) / 2;
72 * Pass event first through all filters and then, if event has not been
73 * filtered out, through all open handles. This function is called with
74 * dev->event_lock held and interrupts disabled.
76 static void input_pass_event(struct input_dev
*dev
,
77 unsigned int type
, unsigned int code
, int value
)
79 struct input_handler
*handler
;
80 struct input_handle
*handle
;
84 handle
= rcu_dereference(dev
->grab
);
86 handle
->handler
->event(handle
, type
, code
, value
);
88 bool filtered
= false;
90 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
) {
94 handler
= handle
->handler
;
95 if (!handler
->filter
) {
99 handler
->event(handle
, type
, code
, value
);
101 } else if (handler
->filter(handle
, type
, code
, value
))
110 * Generate software autorepeat event. Note that we take
111 * dev->event_lock here to avoid racing with input_event
112 * which may cause keys get "stuck".
114 static void input_repeat_key(unsigned long data
)
116 struct input_dev
*dev
= (void *) data
;
119 spin_lock_irqsave(&dev
->event_lock
, flags
);
121 if (test_bit(dev
->repeat_key
, dev
->key
) &&
122 is_event_supported(dev
->repeat_key
, dev
->keybit
, KEY_MAX
)) {
124 input_pass_event(dev
, EV_KEY
, dev
->repeat_key
, 2);
128 * Only send SYN_REPORT if we are not in a middle
129 * of driver parsing a new hardware packet.
130 * Otherwise assume that the driver will send
131 * SYN_REPORT once it's done.
133 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
136 if (dev
->rep
[REP_PERIOD
])
137 mod_timer(&dev
->timer
, jiffies
+
138 msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
141 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
144 static void input_start_autorepeat(struct input_dev
*dev
, int code
)
146 if (test_bit(EV_REP
, dev
->evbit
) &&
147 dev
->rep
[REP_PERIOD
] && dev
->rep
[REP_DELAY
] &&
149 dev
->repeat_key
= code
;
150 mod_timer(&dev
->timer
,
151 jiffies
+ msecs_to_jiffies(dev
->rep
[REP_DELAY
]));
155 static void input_stop_autorepeat(struct input_dev
*dev
)
157 del_timer(&dev
->timer
);
160 #define INPUT_IGNORE_EVENT 0
161 #define INPUT_PASS_TO_HANDLERS 1
162 #define INPUT_PASS_TO_DEVICE 2
163 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
165 static int input_handle_abs_event(struct input_dev
*dev
,
166 unsigned int code
, int *pval
)
171 if (code
== ABS_MT_SLOT
) {
173 * "Stage" the event; we'll flush it later, when we
174 * get actual touch data.
176 if (*pval
>= 0 && *pval
< dev
->mtsize
)
179 return INPUT_IGNORE_EVENT
;
182 is_mt_event
= code
>= ABS_MT_FIRST
&& code
<= ABS_MT_LAST
;
185 pold
= &dev
->absinfo
[code
].value
;
186 } else if (dev
->mt
) {
187 struct input_mt_slot
*mtslot
= &dev
->mt
[dev
->slot
];
188 pold
= &mtslot
->abs
[code
- ABS_MT_FIRST
];
191 * Bypass filtering for multi-touch events when
192 * not employing slots.
198 *pval
= input_defuzz_abs_event(*pval
, *pold
,
199 dev
->absinfo
[code
].fuzz
);
201 return INPUT_IGNORE_EVENT
;
206 /* Flush pending "slot" event */
207 if (is_mt_event
&& dev
->slot
!= input_abs_get_val(dev
, ABS_MT_SLOT
)) {
208 input_abs_set_val(dev
, ABS_MT_SLOT
, dev
->slot
);
209 input_pass_event(dev
, EV_ABS
, ABS_MT_SLOT
, dev
->slot
);
212 return INPUT_PASS_TO_HANDLERS
;
215 static void input_handle_event(struct input_dev
*dev
,
216 unsigned int type
, unsigned int code
, int value
)
218 int disposition
= INPUT_IGNORE_EVENT
;
225 disposition
= INPUT_PASS_TO_ALL
;
231 disposition
= INPUT_PASS_TO_HANDLERS
;
236 disposition
= INPUT_PASS_TO_HANDLERS
;
242 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
243 !!test_bit(code
, dev
->key
) != value
) {
246 __change_bit(code
, dev
->key
);
248 input_start_autorepeat(dev
, code
);
250 input_stop_autorepeat(dev
);
253 disposition
= INPUT_PASS_TO_HANDLERS
;
258 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
259 !!test_bit(code
, dev
->sw
) != value
) {
261 __change_bit(code
, dev
->sw
);
262 disposition
= INPUT_PASS_TO_HANDLERS
;
267 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
))
268 disposition
= input_handle_abs_event(dev
, code
, &value
);
273 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
274 disposition
= INPUT_PASS_TO_HANDLERS
;
279 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
280 disposition
= INPUT_PASS_TO_ALL
;
285 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
286 !!test_bit(code
, dev
->led
) != value
) {
288 __change_bit(code
, dev
->led
);
289 disposition
= INPUT_PASS_TO_ALL
;
294 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
296 if (!!test_bit(code
, dev
->snd
) != !!value
)
297 __change_bit(code
, dev
->snd
);
298 disposition
= INPUT_PASS_TO_ALL
;
303 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
304 dev
->rep
[code
] = value
;
305 disposition
= INPUT_PASS_TO_ALL
;
311 disposition
= INPUT_PASS_TO_ALL
;
315 disposition
= INPUT_PASS_TO_ALL
;
319 if (disposition
!= INPUT_IGNORE_EVENT
&& type
!= EV_SYN
)
322 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
323 dev
->event(dev
, type
, code
, value
);
325 if (disposition
& INPUT_PASS_TO_HANDLERS
)
326 input_pass_event(dev
, type
, code
, value
);
330 * input_event() - report new input event
331 * @dev: device that generated the event
332 * @type: type of the event
334 * @value: value of the event
336 * This function should be used by drivers implementing various input
337 * devices to report input events. See also input_inject_event().
339 * NOTE: input_event() may be safely used right after input device was
340 * allocated with input_allocate_device(), even before it is registered
341 * with input_register_device(), but the event will not reach any of the
342 * input handlers. Such early invocation of input_event() may be used
343 * to 'seed' initial state of a switch or initial position of absolute
346 void input_event(struct input_dev
*dev
,
347 unsigned int type
, unsigned int code
, int value
)
351 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
353 spin_lock_irqsave(&dev
->event_lock
, flags
);
354 add_input_randomness(type
, code
, value
);
355 input_handle_event(dev
, type
, code
, value
);
356 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
359 EXPORT_SYMBOL(input_event
);
362 * input_inject_event() - send input event from input handler
363 * @handle: input handle to send event through
364 * @type: type of the event
366 * @value: value of the event
368 * Similar to input_event() but will ignore event if device is
369 * "grabbed" and handle injecting event is not the one that owns
372 void input_inject_event(struct input_handle
*handle
,
373 unsigned int type
, unsigned int code
, int value
)
375 struct input_dev
*dev
= handle
->dev
;
376 struct input_handle
*grab
;
379 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
380 spin_lock_irqsave(&dev
->event_lock
, flags
);
383 grab
= rcu_dereference(dev
->grab
);
384 if (!grab
|| grab
== handle
)
385 input_handle_event(dev
, type
, code
, value
);
388 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
391 EXPORT_SYMBOL(input_inject_event
);
394 * input_alloc_absinfo - allocates array of input_absinfo structs
395 * @dev: the input device emitting absolute events
397 * If the absinfo struct the caller asked for is already allocated, this
398 * functions will not do anything.
400 void input_alloc_absinfo(struct input_dev
*dev
)
403 dev
->absinfo
= kcalloc(ABS_CNT
, sizeof(struct input_absinfo
),
406 WARN(!dev
->absinfo
, "%s(): kcalloc() failed?\n", __func__
);
408 EXPORT_SYMBOL(input_alloc_absinfo
);
410 void input_set_abs_params(struct input_dev
*dev
, unsigned int axis
,
411 int min
, int max
, int fuzz
, int flat
)
413 struct input_absinfo
*absinfo
;
415 input_alloc_absinfo(dev
);
419 absinfo
= &dev
->absinfo
[axis
];
420 absinfo
->minimum
= min
;
421 absinfo
->maximum
= max
;
422 absinfo
->fuzz
= fuzz
;
423 absinfo
->flat
= flat
;
425 dev
->absbit
[BIT_WORD(axis
)] |= BIT_MASK(axis
);
427 EXPORT_SYMBOL(input_set_abs_params
);
431 * input_grab_device - grabs device for exclusive use
432 * @handle: input handle that wants to own the device
434 * When a device is grabbed by an input handle all events generated by
435 * the device are delivered only to this handle. Also events injected
436 * by other input handles are ignored while device is grabbed.
438 int input_grab_device(struct input_handle
*handle
)
440 struct input_dev
*dev
= handle
->dev
;
443 retval
= mutex_lock_interruptible(&dev
->mutex
);
452 rcu_assign_pointer(dev
->grab
, handle
);
456 mutex_unlock(&dev
->mutex
);
459 EXPORT_SYMBOL(input_grab_device
);
461 static void __input_release_device(struct input_handle
*handle
)
463 struct input_dev
*dev
= handle
->dev
;
465 if (dev
->grab
== handle
) {
466 rcu_assign_pointer(dev
->grab
, NULL
);
467 /* Make sure input_pass_event() notices that grab is gone */
470 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
471 if (handle
->open
&& handle
->handler
->start
)
472 handle
->handler
->start(handle
);
477 * input_release_device - release previously grabbed device
478 * @handle: input handle that owns the device
480 * Releases previously grabbed device so that other input handles can
481 * start receiving input events. Upon release all handlers attached
482 * to the device have their start() method called so they have a change
483 * to synchronize device state with the rest of the system.
485 void input_release_device(struct input_handle
*handle
)
487 struct input_dev
*dev
= handle
->dev
;
489 mutex_lock(&dev
->mutex
);
490 __input_release_device(handle
);
491 mutex_unlock(&dev
->mutex
);
493 EXPORT_SYMBOL(input_release_device
);
496 * input_open_device - open input device
497 * @handle: handle through which device is being accessed
499 * This function should be called by input handlers when they
500 * want to start receive events from given input device.
502 int input_open_device(struct input_handle
*handle
)
504 struct input_dev
*dev
= handle
->dev
;
507 retval
= mutex_lock_interruptible(&dev
->mutex
);
511 if (dev
->going_away
) {
518 if (!dev
->users
++ && dev
->open
)
519 retval
= dev
->open(dev
);
523 if (!--handle
->open
) {
525 * Make sure we are not delivering any more events
526 * through this handle
533 mutex_unlock(&dev
->mutex
);
536 EXPORT_SYMBOL(input_open_device
);
538 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
540 struct input_dev
*dev
= handle
->dev
;
543 retval
= mutex_lock_interruptible(&dev
->mutex
);
548 retval
= dev
->flush(dev
, file
);
550 mutex_unlock(&dev
->mutex
);
553 EXPORT_SYMBOL(input_flush_device
);
556 * input_close_device - close input device
557 * @handle: handle through which device is being accessed
559 * This function should be called by input handlers when they
560 * want to stop receive events from given input device.
562 void input_close_device(struct input_handle
*handle
)
564 struct input_dev
*dev
= handle
->dev
;
566 mutex_lock(&dev
->mutex
);
568 __input_release_device(handle
);
570 if (!--dev
->users
&& dev
->close
)
573 if (!--handle
->open
) {
575 * synchronize_rcu() makes sure that input_pass_event()
576 * completed and that no more input events are delivered
577 * through this handle
582 mutex_unlock(&dev
->mutex
);
584 EXPORT_SYMBOL(input_close_device
);
587 * Simulate keyup events for all keys that are marked as pressed.
588 * The function must be called with dev->event_lock held.
590 static void input_dev_release_keys(struct input_dev
*dev
)
594 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
595 for (code
= 0; code
<= KEY_MAX
; code
++) {
596 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
597 __test_and_clear_bit(code
, dev
->key
)) {
598 input_pass_event(dev
, EV_KEY
, code
, 0);
601 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
606 * Prepare device for unregistering
608 static void input_disconnect_device(struct input_dev
*dev
)
610 struct input_handle
*handle
;
613 * Mark device as going away. Note that we take dev->mutex here
614 * not to protect access to dev->going_away but rather to ensure
615 * that there are no threads in the middle of input_open_device()
617 mutex_lock(&dev
->mutex
);
618 dev
->going_away
= true;
619 mutex_unlock(&dev
->mutex
);
621 spin_lock_irq(&dev
->event_lock
);
624 * Simulate keyup events for all pressed keys so that handlers
625 * are not left with "stuck" keys. The driver may continue
626 * generate events even after we done here but they will not
627 * reach any handlers.
629 input_dev_release_keys(dev
);
631 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
634 spin_unlock_irq(&dev
->event_lock
);
638 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
639 * @ke: keymap entry containing scancode to be converted.
640 * @scancode: pointer to the location where converted scancode should
643 * This function is used to convert scancode stored in &struct keymap_entry
644 * into scalar form understood by legacy keymap handling methods. These
645 * methods expect scancodes to be represented as 'unsigned int'.
647 int input_scancode_to_scalar(const struct input_keymap_entry
*ke
,
648 unsigned int *scancode
)
652 *scancode
= *((u8
*)ke
->scancode
);
656 *scancode
= *((u16
*)ke
->scancode
);
660 *scancode
= *((u32
*)ke
->scancode
);
669 EXPORT_SYMBOL(input_scancode_to_scalar
);
672 * Those routines handle the default case where no [gs]etkeycode() is
673 * defined. In this case, an array indexed by the scancode is used.
676 static unsigned int input_fetch_keycode(struct input_dev
*dev
,
679 switch (dev
->keycodesize
) {
681 return ((u8
*)dev
->keycode
)[index
];
684 return ((u16
*)dev
->keycode
)[index
];
687 return ((u32
*)dev
->keycode
)[index
];
691 static int input_default_getkeycode(struct input_dev
*dev
,
692 struct input_keymap_entry
*ke
)
697 if (!dev
->keycodesize
)
700 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
)
703 error
= input_scancode_to_scalar(ke
, &index
);
708 if (index
>= dev
->keycodemax
)
711 ke
->keycode
= input_fetch_keycode(dev
, index
);
713 ke
->len
= sizeof(index
);
714 memcpy(ke
->scancode
, &index
, sizeof(index
));
719 static int input_default_setkeycode(struct input_dev
*dev
,
720 const struct input_keymap_entry
*ke
,
721 unsigned int *old_keycode
)
727 if (!dev
->keycodesize
)
730 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
) {
733 error
= input_scancode_to_scalar(ke
, &index
);
738 if (index
>= dev
->keycodemax
)
741 if (dev
->keycodesize
< sizeof(dev
->keycode
) &&
742 (ke
->keycode
>> (dev
->keycodesize
* 8)))
745 switch (dev
->keycodesize
) {
747 u8
*k
= (u8
*)dev
->keycode
;
748 *old_keycode
= k
[index
];
749 k
[index
] = ke
->keycode
;
753 u16
*k
= (u16
*)dev
->keycode
;
754 *old_keycode
= k
[index
];
755 k
[index
] = ke
->keycode
;
759 u32
*k
= (u32
*)dev
->keycode
;
760 *old_keycode
= k
[index
];
761 k
[index
] = ke
->keycode
;
766 __clear_bit(*old_keycode
, dev
->keybit
);
767 __set_bit(ke
->keycode
, dev
->keybit
);
769 for (i
= 0; i
< dev
->keycodemax
; i
++) {
770 if (input_fetch_keycode(dev
, i
) == *old_keycode
) {
771 __set_bit(*old_keycode
, dev
->keybit
);
772 break; /* Setting the bit twice is useless, so break */
780 * input_get_keycode - retrieve keycode currently mapped to a given scancode
781 * @dev: input device which keymap is being queried
784 * This function should be called by anyone interested in retrieving current
785 * keymap. Presently evdev handlers use it.
787 int input_get_keycode(struct input_dev
*dev
, struct input_keymap_entry
*ke
)
792 spin_lock_irqsave(&dev
->event_lock
, flags
);
794 if (dev
->getkeycode
) {
796 * Support for legacy drivers, that don't implement the new
799 u32 scancode
= ke
->index
;
801 memcpy(ke
->scancode
, &scancode
, sizeof(scancode
));
802 ke
->len
= sizeof(scancode
);
803 retval
= dev
->getkeycode(dev
, scancode
, &ke
->keycode
);
805 retval
= dev
->getkeycode_new(dev
, ke
);
808 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
811 EXPORT_SYMBOL(input_get_keycode
);
814 * input_set_keycode - attribute a keycode to a given scancode
815 * @dev: input device which keymap is being updated
816 * @ke: new keymap entry
818 * This function should be called by anyone needing to update current
819 * keymap. Presently keyboard and evdev handlers use it.
821 int input_set_keycode(struct input_dev
*dev
,
822 const struct input_keymap_entry
*ke
)
825 unsigned int old_keycode
;
828 if (ke
->keycode
> KEY_MAX
)
831 spin_lock_irqsave(&dev
->event_lock
, flags
);
833 if (dev
->setkeycode
) {
835 * Support for legacy drivers, that don't implement the new
838 unsigned int scancode
;
840 retval
= input_scancode_to_scalar(ke
, &scancode
);
845 * We need to know the old scancode, in order to generate a
846 * keyup effect, if the set operation happens successfully
848 if (!dev
->getkeycode
) {
853 retval
= dev
->getkeycode(dev
, scancode
, &old_keycode
);
857 retval
= dev
->setkeycode(dev
, scancode
, ke
->keycode
);
859 retval
= dev
->setkeycode_new(dev
, ke
, &old_keycode
);
865 /* Make sure KEY_RESERVED did not get enabled. */
866 __clear_bit(KEY_RESERVED
, dev
->keybit
);
869 * Simulate keyup event if keycode is not present
870 * in the keymap anymore
872 if (test_bit(EV_KEY
, dev
->evbit
) &&
873 !is_event_supported(old_keycode
, dev
->keybit
, KEY_MAX
) &&
874 __test_and_clear_bit(old_keycode
, dev
->key
)) {
876 input_pass_event(dev
, EV_KEY
, old_keycode
, 0);
878 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
882 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
886 EXPORT_SYMBOL(input_set_keycode
);
888 #define MATCH_BIT(bit, max) \
889 for (i = 0; i < BITS_TO_LONGS(max); i++) \
890 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
892 if (i != BITS_TO_LONGS(max)) \
895 static const struct input_device_id
*input_match_device(struct input_handler
*handler
,
896 struct input_dev
*dev
)
898 const struct input_device_id
*id
;
901 for (id
= handler
->id_table
; id
->flags
|| id
->driver_info
; id
++) {
903 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
904 if (id
->bustype
!= dev
->id
.bustype
)
907 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
908 if (id
->vendor
!= dev
->id
.vendor
)
911 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
912 if (id
->product
!= dev
->id
.product
)
915 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
916 if (id
->version
!= dev
->id
.version
)
919 MATCH_BIT(evbit
, EV_MAX
);
920 MATCH_BIT(keybit
, KEY_MAX
);
921 MATCH_BIT(relbit
, REL_MAX
);
922 MATCH_BIT(absbit
, ABS_MAX
);
923 MATCH_BIT(mscbit
, MSC_MAX
);
924 MATCH_BIT(ledbit
, LED_MAX
);
925 MATCH_BIT(sndbit
, SND_MAX
);
926 MATCH_BIT(ffbit
, FF_MAX
);
927 MATCH_BIT(swbit
, SW_MAX
);
929 if (!handler
->match
|| handler
->match(handler
, dev
))
936 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
938 const struct input_device_id
*id
;
941 id
= input_match_device(handler
, dev
);
945 error
= handler
->connect(handler
, dev
, id
);
946 if (error
&& error
!= -ENODEV
)
948 "input: failed to attach handler %s to device %s, "
950 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
957 static int input_bits_to_string(char *buf
, int buf_size
,
958 unsigned long bits
, bool skip_empty
)
962 if (INPUT_COMPAT_TEST
) {
963 u32 dword
= bits
>> 32;
964 if (dword
|| !skip_empty
)
965 len
+= snprintf(buf
, buf_size
, "%x ", dword
);
967 dword
= bits
& 0xffffffffUL
;
968 if (dword
|| !skip_empty
|| len
)
969 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
972 if (bits
|| !skip_empty
)
973 len
+= snprintf(buf
, buf_size
, "%lx", bits
);
979 #else /* !CONFIG_COMPAT */
981 static int input_bits_to_string(char *buf
, int buf_size
,
982 unsigned long bits
, bool skip_empty
)
984 return bits
|| !skip_empty
?
985 snprintf(buf
, buf_size
, "%lx", bits
) : 0;
990 #ifdef CONFIG_PROC_FS
992 static struct proc_dir_entry
*proc_bus_input_dir
;
993 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
994 static int input_devices_state
;
996 static inline void input_wakeup_procfs_readers(void)
998 input_devices_state
++;
999 wake_up(&input_devices_poll_wait
);
1002 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
1004 poll_wait(file
, &input_devices_poll_wait
, wait
);
1005 if (file
->f_version
!= input_devices_state
) {
1006 file
->f_version
= input_devices_state
;
1007 return POLLIN
| POLLRDNORM
;
1013 union input_seq_state
{
1016 bool mutex_acquired
;
1021 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1023 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1026 /* We need to fit into seq->private pointer */
1027 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1029 error
= mutex_lock_interruptible(&input_mutex
);
1031 state
->mutex_acquired
= false;
1032 return ERR_PTR(error
);
1035 state
->mutex_acquired
= true;
1037 return seq_list_start(&input_dev_list
, *pos
);
1040 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1042 return seq_list_next(v
, &input_dev_list
, pos
);
1045 static void input_seq_stop(struct seq_file
*seq
, void *v
)
1047 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1049 if (state
->mutex_acquired
)
1050 mutex_unlock(&input_mutex
);
1053 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
1054 unsigned long *bitmap
, int max
)
1057 bool skip_empty
= true;
1060 seq_printf(seq
, "B: %s=", name
);
1062 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1063 if (input_bits_to_string(buf
, sizeof(buf
),
1064 bitmap
[i
], skip_empty
)) {
1066 seq_printf(seq
, "%s%s", buf
, i
> 0 ? " " : "");
1071 * If no output was produced print a single 0.
1076 seq_putc(seq
, '\n');
1079 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
1081 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
1082 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1083 struct input_handle
*handle
;
1085 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1086 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
1088 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
1089 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
1090 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
1091 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
1092 seq_printf(seq
, "H: Handlers=");
1094 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
1095 seq_printf(seq
, "%s ", handle
->name
);
1096 seq_putc(seq
, '\n');
1098 input_seq_print_bitmap(seq
, "PROP", dev
->propbit
, INPUT_PROP_MAX
);
1100 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
1101 if (test_bit(EV_KEY
, dev
->evbit
))
1102 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
1103 if (test_bit(EV_REL
, dev
->evbit
))
1104 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
1105 if (test_bit(EV_ABS
, dev
->evbit
))
1106 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
1107 if (test_bit(EV_MSC
, dev
->evbit
))
1108 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
1109 if (test_bit(EV_LED
, dev
->evbit
))
1110 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
1111 if (test_bit(EV_SND
, dev
->evbit
))
1112 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
1113 if (test_bit(EV_FF
, dev
->evbit
))
1114 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
1115 if (test_bit(EV_SW
, dev
->evbit
))
1116 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
1118 seq_putc(seq
, '\n');
1124 static const struct seq_operations input_devices_seq_ops
= {
1125 .start
= input_devices_seq_start
,
1126 .next
= input_devices_seq_next
,
1127 .stop
= input_seq_stop
,
1128 .show
= input_devices_seq_show
,
1131 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
1133 return seq_open(file
, &input_devices_seq_ops
);
1136 static const struct file_operations input_devices_fileops
= {
1137 .owner
= THIS_MODULE
,
1138 .open
= input_proc_devices_open
,
1139 .poll
= input_proc_devices_poll
,
1141 .llseek
= seq_lseek
,
1142 .release
= seq_release
,
1145 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1147 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1150 /* We need to fit into seq->private pointer */
1151 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1153 error
= mutex_lock_interruptible(&input_mutex
);
1155 state
->mutex_acquired
= false;
1156 return ERR_PTR(error
);
1159 state
->mutex_acquired
= true;
1162 return seq_list_start(&input_handler_list
, *pos
);
1165 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1167 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1169 state
->pos
= *pos
+ 1;
1170 return seq_list_next(v
, &input_handler_list
, pos
);
1173 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
1175 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
1176 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1178 seq_printf(seq
, "N: Number=%u Name=%s", state
->pos
, handler
->name
);
1179 if (handler
->filter
)
1180 seq_puts(seq
, " (filter)");
1182 seq_printf(seq
, " Minor=%d", handler
->minor
);
1183 seq_putc(seq
, '\n');
1188 static const struct seq_operations input_handlers_seq_ops
= {
1189 .start
= input_handlers_seq_start
,
1190 .next
= input_handlers_seq_next
,
1191 .stop
= input_seq_stop
,
1192 .show
= input_handlers_seq_show
,
1195 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
1197 return seq_open(file
, &input_handlers_seq_ops
);
1200 static const struct file_operations input_handlers_fileops
= {
1201 .owner
= THIS_MODULE
,
1202 .open
= input_proc_handlers_open
,
1204 .llseek
= seq_lseek
,
1205 .release
= seq_release
,
1208 static int __init
input_proc_init(void)
1210 struct proc_dir_entry
*entry
;
1212 proc_bus_input_dir
= proc_mkdir("bus/input", NULL
);
1213 if (!proc_bus_input_dir
)
1216 entry
= proc_create("devices", 0, proc_bus_input_dir
,
1217 &input_devices_fileops
);
1221 entry
= proc_create("handlers", 0, proc_bus_input_dir
,
1222 &input_handlers_fileops
);
1228 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
1229 fail1
: remove_proc_entry("bus/input", NULL
);
1233 static void input_proc_exit(void)
1235 remove_proc_entry("devices", proc_bus_input_dir
);
1236 remove_proc_entry("handlers", proc_bus_input_dir
);
1237 remove_proc_entry("bus/input", NULL
);
1240 #else /* !CONFIG_PROC_FS */
1241 static inline void input_wakeup_procfs_readers(void) { }
1242 static inline int input_proc_init(void) { return 0; }
1243 static inline void input_proc_exit(void) { }
1246 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1247 static ssize_t input_dev_show_##name(struct device *dev, \
1248 struct device_attribute *attr, \
1251 struct input_dev *input_dev = to_input_dev(dev); \
1253 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1254 input_dev->name ? input_dev->name : ""); \
1256 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1258 INPUT_DEV_STRING_ATTR_SHOW(name
);
1259 INPUT_DEV_STRING_ATTR_SHOW(phys
);
1260 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
1262 static int input_print_modalias_bits(char *buf
, int size
,
1263 char name
, unsigned long *bm
,
1264 unsigned int min_bit
, unsigned int max_bit
)
1268 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
1269 for (i
= min_bit
; i
< max_bit
; i
++)
1270 if (bm
[BIT_WORD(i
)] & BIT_MASK(i
))
1271 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
1275 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
1280 len
= snprintf(buf
, max(size
, 0),
1281 "input:b%04Xv%04Xp%04Xe%04X-",
1282 id
->id
.bustype
, id
->id
.vendor
,
1283 id
->id
.product
, id
->id
.version
);
1285 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1286 'e', id
->evbit
, 0, EV_MAX
);
1287 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1288 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
1289 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1290 'r', id
->relbit
, 0, REL_MAX
);
1291 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1292 'a', id
->absbit
, 0, ABS_MAX
);
1293 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1294 'm', id
->mscbit
, 0, MSC_MAX
);
1295 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1296 'l', id
->ledbit
, 0, LED_MAX
);
1297 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1298 's', id
->sndbit
, 0, SND_MAX
);
1299 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1300 'f', id
->ffbit
, 0, FF_MAX
);
1301 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1302 'w', id
->swbit
, 0, SW_MAX
);
1305 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
1310 static ssize_t
input_dev_show_modalias(struct device
*dev
,
1311 struct device_attribute
*attr
,
1314 struct input_dev
*id
= to_input_dev(dev
);
1317 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
1319 return min_t(int, len
, PAGE_SIZE
);
1321 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
1323 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1324 int max
, int add_cr
);
1326 static ssize_t
input_dev_show_properties(struct device
*dev
,
1327 struct device_attribute
*attr
,
1330 struct input_dev
*input_dev
= to_input_dev(dev
);
1331 int len
= input_print_bitmap(buf
, PAGE_SIZE
, input_dev
->propbit
,
1332 INPUT_PROP_MAX
, true);
1333 return min_t(int, len
, PAGE_SIZE
);
1335 static DEVICE_ATTR(properties
, S_IRUGO
, input_dev_show_properties
, NULL
);
1337 static struct attribute
*input_dev_attrs
[] = {
1338 &dev_attr_name
.attr
,
1339 &dev_attr_phys
.attr
,
1340 &dev_attr_uniq
.attr
,
1341 &dev_attr_modalias
.attr
,
1342 &dev_attr_properties
.attr
,
1346 static struct attribute_group input_dev_attr_group
= {
1347 .attrs
= input_dev_attrs
,
1350 #define INPUT_DEV_ID_ATTR(name) \
1351 static ssize_t input_dev_show_id_##name(struct device *dev, \
1352 struct device_attribute *attr, \
1355 struct input_dev *input_dev = to_input_dev(dev); \
1356 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1358 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1360 INPUT_DEV_ID_ATTR(bustype
);
1361 INPUT_DEV_ID_ATTR(vendor
);
1362 INPUT_DEV_ID_ATTR(product
);
1363 INPUT_DEV_ID_ATTR(version
);
1365 static struct attribute
*input_dev_id_attrs
[] = {
1366 &dev_attr_bustype
.attr
,
1367 &dev_attr_vendor
.attr
,
1368 &dev_attr_product
.attr
,
1369 &dev_attr_version
.attr
,
1373 static struct attribute_group input_dev_id_attr_group
= {
1375 .attrs
= input_dev_id_attrs
,
1378 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1379 int max
, int add_cr
)
1383 bool skip_empty
= true;
1385 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1386 len
+= input_bits_to_string(buf
+ len
, max(buf_size
- len
, 0),
1387 bitmap
[i
], skip_empty
);
1391 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), " ");
1396 * If no output was produced print a single 0.
1399 len
= snprintf(buf
, buf_size
, "%d", 0);
1402 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1407 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1408 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1409 struct device_attribute *attr, \
1412 struct input_dev *input_dev = to_input_dev(dev); \
1413 int len = input_print_bitmap(buf, PAGE_SIZE, \
1414 input_dev->bm##bit, ev##_MAX, \
1416 return min_t(int, len, PAGE_SIZE); \
1418 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1420 INPUT_DEV_CAP_ATTR(EV
, ev
);
1421 INPUT_DEV_CAP_ATTR(KEY
, key
);
1422 INPUT_DEV_CAP_ATTR(REL
, rel
);
1423 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1424 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1425 INPUT_DEV_CAP_ATTR(LED
, led
);
1426 INPUT_DEV_CAP_ATTR(SND
, snd
);
1427 INPUT_DEV_CAP_ATTR(FF
, ff
);
1428 INPUT_DEV_CAP_ATTR(SW
, sw
);
1430 static struct attribute
*input_dev_caps_attrs
[] = {
1443 static struct attribute_group input_dev_caps_attr_group
= {
1444 .name
= "capabilities",
1445 .attrs
= input_dev_caps_attrs
,
1448 static const struct attribute_group
*input_dev_attr_groups
[] = {
1449 &input_dev_attr_group
,
1450 &input_dev_id_attr_group
,
1451 &input_dev_caps_attr_group
,
1455 static void input_dev_release(struct device
*device
)
1457 struct input_dev
*dev
= to_input_dev(device
);
1459 input_ff_destroy(dev
);
1460 input_mt_destroy_slots(dev
);
1461 kfree(dev
->absinfo
);
1464 module_put(THIS_MODULE
);
1468 * Input uevent interface - loading event handlers based on
1471 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1472 const char *name
, unsigned long *bitmap
, int max
)
1476 if (add_uevent_var(env
, "%s=", name
))
1479 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1480 sizeof(env
->buf
) - env
->buflen
,
1481 bitmap
, max
, false);
1482 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1489 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1490 struct input_dev
*dev
)
1494 if (add_uevent_var(env
, "MODALIAS="))
1497 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1498 sizeof(env
->buf
) - env
->buflen
,
1500 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1507 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1509 int err = add_uevent_var(env, fmt, val); \
1514 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1516 int err = input_add_uevent_bm_var(env, name, bm, max); \
1521 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1523 int err = input_add_uevent_modalias_var(env, dev); \
1528 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1530 struct input_dev
*dev
= to_input_dev(device
);
1532 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1533 dev
->id
.bustype
, dev
->id
.vendor
,
1534 dev
->id
.product
, dev
->id
.version
);
1536 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1538 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1540 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1542 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev
->propbit
, INPUT_PROP_MAX
);
1544 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1545 if (test_bit(EV_KEY
, dev
->evbit
))
1546 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1547 if (test_bit(EV_REL
, dev
->evbit
))
1548 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1549 if (test_bit(EV_ABS
, dev
->evbit
))
1550 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1551 if (test_bit(EV_MSC
, dev
->evbit
))
1552 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1553 if (test_bit(EV_LED
, dev
->evbit
))
1554 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1555 if (test_bit(EV_SND
, dev
->evbit
))
1556 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1557 if (test_bit(EV_FF
, dev
->evbit
))
1558 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1559 if (test_bit(EV_SW
, dev
->evbit
))
1560 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1562 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1567 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1572 if (!test_bit(EV_##type, dev->evbit)) \
1575 for (i = 0; i < type##_MAX; i++) { \
1576 if (!test_bit(i, dev->bits##bit)) \
1579 active = test_bit(i, dev->bits); \
1580 if (!active && !on) \
1583 dev->event(dev, EV_##type, i, on ? active : 0); \
1588 static void input_dev_reset(struct input_dev
*dev
, bool activate
)
1593 INPUT_DO_TOGGLE(dev
, LED
, led
, activate
);
1594 INPUT_DO_TOGGLE(dev
, SND
, snd
, activate
);
1596 if (activate
&& test_bit(EV_REP
, dev
->evbit
)) {
1597 dev
->event(dev
, EV_REP
, REP_PERIOD
, dev
->rep
[REP_PERIOD
]);
1598 dev
->event(dev
, EV_REP
, REP_DELAY
, dev
->rep
[REP_DELAY
]);
1602 static int input_dev_suspend(struct device
*dev
)
1604 struct input_dev
*input_dev
= to_input_dev(dev
);
1606 mutex_lock(&input_dev
->mutex
);
1607 input_dev_reset(input_dev
, false);
1608 mutex_unlock(&input_dev
->mutex
);
1613 static int input_dev_resume(struct device
*dev
)
1615 struct input_dev
*input_dev
= to_input_dev(dev
);
1617 mutex_lock(&input_dev
->mutex
);
1618 input_dev_reset(input_dev
, true);
1621 * Keys that have been pressed at suspend time are unlikely
1622 * to be still pressed when we resume.
1624 spin_lock_irq(&input_dev
->event_lock
);
1625 input_dev_release_keys(input_dev
);
1626 spin_unlock_irq(&input_dev
->event_lock
);
1628 mutex_unlock(&input_dev
->mutex
);
1633 static const struct dev_pm_ops input_dev_pm_ops
= {
1634 .suspend
= input_dev_suspend
,
1635 .resume
= input_dev_resume
,
1636 .poweroff
= input_dev_suspend
,
1637 .restore
= input_dev_resume
,
1639 #endif /* CONFIG_PM */
1641 static struct device_type input_dev_type
= {
1642 .groups
= input_dev_attr_groups
,
1643 .release
= input_dev_release
,
1644 .uevent
= input_dev_uevent
,
1646 .pm
= &input_dev_pm_ops
,
1650 static char *input_devnode(struct device
*dev
, mode_t
*mode
)
1652 return kasprintf(GFP_KERNEL
, "input/%s", dev_name(dev
));
1655 struct class input_class
= {
1657 .devnode
= input_devnode
,
1659 EXPORT_SYMBOL_GPL(input_class
);
1662 * input_allocate_device - allocate memory for new input device
1664 * Returns prepared struct input_dev or NULL.
1666 * NOTE: Use input_free_device() to free devices that have not been
1667 * registered; input_unregister_device() should be used for already
1668 * registered devices.
1670 struct input_dev
*input_allocate_device(void)
1672 struct input_dev
*dev
;
1674 dev
= kzalloc(sizeof(struct input_dev
), GFP_KERNEL
);
1676 dev
->dev
.type
= &input_dev_type
;
1677 dev
->dev
.class = &input_class
;
1678 device_initialize(&dev
->dev
);
1679 mutex_init(&dev
->mutex
);
1680 spin_lock_init(&dev
->event_lock
);
1681 INIT_LIST_HEAD(&dev
->h_list
);
1682 INIT_LIST_HEAD(&dev
->node
);
1684 __module_get(THIS_MODULE
);
1689 EXPORT_SYMBOL(input_allocate_device
);
1692 * input_free_device - free memory occupied by input_dev structure
1693 * @dev: input device to free
1695 * This function should only be used if input_register_device()
1696 * was not called yet or if it failed. Once device was registered
1697 * use input_unregister_device() and memory will be freed once last
1698 * reference to the device is dropped.
1700 * Device should be allocated by input_allocate_device().
1702 * NOTE: If there are references to the input device then memory
1703 * will not be freed until last reference is dropped.
1705 void input_free_device(struct input_dev
*dev
)
1708 input_put_device(dev
);
1710 EXPORT_SYMBOL(input_free_device
);
1713 * input_set_capability - mark device as capable of a certain event
1714 * @dev: device that is capable of emitting or accepting event
1715 * @type: type of the event (EV_KEY, EV_REL, etc...)
1718 * In addition to setting up corresponding bit in appropriate capability
1719 * bitmap the function also adjusts dev->evbit.
1721 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1725 __set_bit(code
, dev
->keybit
);
1729 __set_bit(code
, dev
->relbit
);
1733 __set_bit(code
, dev
->absbit
);
1737 __set_bit(code
, dev
->mscbit
);
1741 __set_bit(code
, dev
->swbit
);
1745 __set_bit(code
, dev
->ledbit
);
1749 __set_bit(code
, dev
->sndbit
);
1753 __set_bit(code
, dev
->ffbit
);
1762 "input_set_capability: unknown type %u (code %u)\n",
1768 __set_bit(type
, dev
->evbit
);
1770 EXPORT_SYMBOL(input_set_capability
);
1772 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1774 if (!test_bit(EV_##type, dev->evbit)) \
1775 memset(dev->bits##bit, 0, \
1776 sizeof(dev->bits##bit)); \
1779 static void input_cleanse_bitmasks(struct input_dev
*dev
)
1781 INPUT_CLEANSE_BITMASK(dev
, KEY
, key
);
1782 INPUT_CLEANSE_BITMASK(dev
, REL
, rel
);
1783 INPUT_CLEANSE_BITMASK(dev
, ABS
, abs
);
1784 INPUT_CLEANSE_BITMASK(dev
, MSC
, msc
);
1785 INPUT_CLEANSE_BITMASK(dev
, LED
, led
);
1786 INPUT_CLEANSE_BITMASK(dev
, SND
, snd
);
1787 INPUT_CLEANSE_BITMASK(dev
, FF
, ff
);
1788 INPUT_CLEANSE_BITMASK(dev
, SW
, sw
);
1792 * input_register_device - register device with input core
1793 * @dev: device to be registered
1795 * This function registers device with input core. The device must be
1796 * allocated with input_allocate_device() and all it's capabilities
1797 * set up before registering.
1798 * If function fails the device must be freed with input_free_device().
1799 * Once device has been successfully registered it can be unregistered
1800 * with input_unregister_device(); input_free_device() should not be
1801 * called in this case.
1803 int input_register_device(struct input_dev
*dev
)
1805 static atomic_t input_no
= ATOMIC_INIT(0);
1806 struct input_handler
*handler
;
1810 /* Every input device generates EV_SYN/SYN_REPORT events. */
1811 __set_bit(EV_SYN
, dev
->evbit
);
1813 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1814 __clear_bit(KEY_RESERVED
, dev
->keybit
);
1816 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1817 input_cleanse_bitmasks(dev
);
1820 * If delay and period are pre-set by the driver, then autorepeating
1821 * is handled by the driver itself and we don't do it in input.c.
1823 init_timer(&dev
->timer
);
1824 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
1825 dev
->timer
.data
= (long) dev
;
1826 dev
->timer
.function
= input_repeat_key
;
1827 dev
->rep
[REP_DELAY
] = 250;
1828 dev
->rep
[REP_PERIOD
] = 33;
1831 if (!dev
->getkeycode
&& !dev
->getkeycode_new
)
1832 dev
->getkeycode_new
= input_default_getkeycode
;
1834 if (!dev
->setkeycode
&& !dev
->setkeycode_new
)
1835 dev
->setkeycode_new
= input_default_setkeycode
;
1837 dev_set_name(&dev
->dev
, "input%ld",
1838 (unsigned long) atomic_inc_return(&input_no
) - 1);
1840 error
= device_add(&dev
->dev
);
1844 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1845 printk(KERN_INFO
"input: %s as %s\n",
1846 dev
->name
? dev
->name
: "Unspecified device", path
? path
: "N/A");
1849 error
= mutex_lock_interruptible(&input_mutex
);
1851 device_del(&dev
->dev
);
1855 list_add_tail(&dev
->node
, &input_dev_list
);
1857 list_for_each_entry(handler
, &input_handler_list
, node
)
1858 input_attach_handler(dev
, handler
);
1860 input_wakeup_procfs_readers();
1862 mutex_unlock(&input_mutex
);
1866 EXPORT_SYMBOL(input_register_device
);
1869 * input_unregister_device - unregister previously registered device
1870 * @dev: device to be unregistered
1872 * This function unregisters an input device. Once device is unregistered
1873 * the caller should not try to access it as it may get freed at any moment.
1875 void input_unregister_device(struct input_dev
*dev
)
1877 struct input_handle
*handle
, *next
;
1879 input_disconnect_device(dev
);
1881 mutex_lock(&input_mutex
);
1883 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1884 handle
->handler
->disconnect(handle
);
1885 WARN_ON(!list_empty(&dev
->h_list
));
1887 del_timer_sync(&dev
->timer
);
1888 list_del_init(&dev
->node
);
1890 input_wakeup_procfs_readers();
1892 mutex_unlock(&input_mutex
);
1894 device_unregister(&dev
->dev
);
1896 EXPORT_SYMBOL(input_unregister_device
);
1899 * input_register_handler - register a new input handler
1900 * @handler: handler to be registered
1902 * This function registers a new input handler (interface) for input
1903 * devices in the system and attaches it to all input devices that
1904 * are compatible with the handler.
1906 int input_register_handler(struct input_handler
*handler
)
1908 struct input_dev
*dev
;
1911 retval
= mutex_lock_interruptible(&input_mutex
);
1915 INIT_LIST_HEAD(&handler
->h_list
);
1917 if (handler
->fops
!= NULL
) {
1918 if (input_table
[handler
->minor
>> 5]) {
1922 input_table
[handler
->minor
>> 5] = handler
;
1925 list_add_tail(&handler
->node
, &input_handler_list
);
1927 list_for_each_entry(dev
, &input_dev_list
, node
)
1928 input_attach_handler(dev
, handler
);
1930 input_wakeup_procfs_readers();
1933 mutex_unlock(&input_mutex
);
1936 EXPORT_SYMBOL(input_register_handler
);
1939 * input_unregister_handler - unregisters an input handler
1940 * @handler: handler to be unregistered
1942 * This function disconnects a handler from its input devices and
1943 * removes it from lists of known handlers.
1945 void input_unregister_handler(struct input_handler
*handler
)
1947 struct input_handle
*handle
, *next
;
1949 mutex_lock(&input_mutex
);
1951 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
1952 handler
->disconnect(handle
);
1953 WARN_ON(!list_empty(&handler
->h_list
));
1955 list_del_init(&handler
->node
);
1957 if (handler
->fops
!= NULL
)
1958 input_table
[handler
->minor
>> 5] = NULL
;
1960 input_wakeup_procfs_readers();
1962 mutex_unlock(&input_mutex
);
1964 EXPORT_SYMBOL(input_unregister_handler
);
1967 * input_handler_for_each_handle - handle iterator
1968 * @handler: input handler to iterate
1969 * @data: data for the callback
1970 * @fn: function to be called for each handle
1972 * Iterate over @bus's list of devices, and call @fn for each, passing
1973 * it @data and stop when @fn returns a non-zero value. The function is
1974 * using RCU to traverse the list and therefore may be usind in atonic
1975 * contexts. The @fn callback is invoked from RCU critical section and
1976 * thus must not sleep.
1978 int input_handler_for_each_handle(struct input_handler
*handler
, void *data
,
1979 int (*fn
)(struct input_handle
*, void *))
1981 struct input_handle
*handle
;
1986 list_for_each_entry_rcu(handle
, &handler
->h_list
, h_node
) {
1987 retval
= fn(handle
, data
);
1996 EXPORT_SYMBOL(input_handler_for_each_handle
);
1999 * input_register_handle - register a new input handle
2000 * @handle: handle to register
2002 * This function puts a new input handle onto device's
2003 * and handler's lists so that events can flow through
2004 * it once it is opened using input_open_device().
2006 * This function is supposed to be called from handler's
2009 int input_register_handle(struct input_handle
*handle
)
2011 struct input_handler
*handler
= handle
->handler
;
2012 struct input_dev
*dev
= handle
->dev
;
2016 * We take dev->mutex here to prevent race with
2017 * input_release_device().
2019 error
= mutex_lock_interruptible(&dev
->mutex
);
2024 * Filters go to the head of the list, normal handlers
2027 if (handler
->filter
)
2028 list_add_rcu(&handle
->d_node
, &dev
->h_list
);
2030 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
2032 mutex_unlock(&dev
->mutex
);
2035 * Since we are supposed to be called from ->connect()
2036 * which is mutually exclusive with ->disconnect()
2037 * we can't be racing with input_unregister_handle()
2038 * and so separate lock is not needed here.
2040 list_add_tail_rcu(&handle
->h_node
, &handler
->h_list
);
2043 handler
->start(handle
);
2047 EXPORT_SYMBOL(input_register_handle
);
2050 * input_unregister_handle - unregister an input handle
2051 * @handle: handle to unregister
2053 * This function removes input handle from device's
2054 * and handler's lists.
2056 * This function is supposed to be called from handler's
2057 * disconnect() method.
2059 void input_unregister_handle(struct input_handle
*handle
)
2061 struct input_dev
*dev
= handle
->dev
;
2063 list_del_rcu(&handle
->h_node
);
2066 * Take dev->mutex to prevent race with input_release_device().
2068 mutex_lock(&dev
->mutex
);
2069 list_del_rcu(&handle
->d_node
);
2070 mutex_unlock(&dev
->mutex
);
2074 EXPORT_SYMBOL(input_unregister_handle
);
2076 static int input_open_file(struct inode
*inode
, struct file
*file
)
2078 struct input_handler
*handler
;
2079 const struct file_operations
*old_fops
, *new_fops
= NULL
;
2082 err
= mutex_lock_interruptible(&input_mutex
);
2086 /* No load-on-demand here? */
2087 handler
= input_table
[iminor(inode
) >> 5];
2089 new_fops
= fops_get(handler
->fops
);
2091 mutex_unlock(&input_mutex
);
2094 * That's _really_ odd. Usually NULL ->open means "nothing special",
2095 * not "no device". Oh, well...
2097 if (!new_fops
|| !new_fops
->open
) {
2103 old_fops
= file
->f_op
;
2104 file
->f_op
= new_fops
;
2106 err
= new_fops
->open(inode
, file
);
2108 fops_put(file
->f_op
);
2109 file
->f_op
= fops_get(old_fops
);
2116 static const struct file_operations input_fops
= {
2117 .owner
= THIS_MODULE
,
2118 .open
= input_open_file
,
2119 .llseek
= noop_llseek
,
2122 static int __init
input_init(void)
2126 err
= class_register(&input_class
);
2128 printk(KERN_ERR
"input: unable to register input_dev class\n");
2132 err
= input_proc_init();
2136 err
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
2138 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
2144 fail2
: input_proc_exit();
2145 fail1
: class_unregister(&input_class
);
2149 static void __exit
input_exit(void)
2152 unregister_chrdev(INPUT_MAJOR
, "input");
2153 class_unregister(&input_class
);
2156 subsys_initcall(input_init
);
2157 module_exit(input_exit
);