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.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 "input-compat.h"
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
30 MODULE_DESCRIPTION("Input core");
31 MODULE_LICENSE("GPL");
33 #define INPUT_DEVICES 256
35 static LIST_HEAD(input_dev_list
);
36 static LIST_HEAD(input_handler_list
);
39 * input_mutex protects access to both input_dev_list and input_handler_list.
40 * This also causes input_[un]register_device and input_[un]register_handler
41 * be mutually exclusive which simplifies locking in drivers implementing
44 static DEFINE_MUTEX(input_mutex
);
46 static struct input_handler
*input_table
[8];
48 static inline int is_event_supported(unsigned int code
,
49 unsigned long *bm
, unsigned int max
)
51 return code
<= max
&& test_bit(code
, bm
);
54 static int input_defuzz_abs_event(int value
, int old_val
, int fuzz
)
57 if (value
> old_val
- fuzz
/ 2 && value
< old_val
+ fuzz
/ 2)
60 if (value
> old_val
- fuzz
&& value
< old_val
+ fuzz
)
61 return (old_val
* 3 + value
) / 4;
63 if (value
> old_val
- fuzz
* 2 && value
< old_val
+ fuzz
* 2)
64 return (old_val
+ value
) / 2;
71 * Pass event first through all filters and then, if event has not been
72 * filtered out, through all open handles. This function is called with
73 * dev->event_lock held and interrupts disabled.
75 static void input_pass_event(struct input_dev
*dev
,
76 unsigned int type
, unsigned int code
, int value
)
78 struct input_handler
*handler
;
79 struct input_handle
*handle
;
83 handle
= rcu_dereference(dev
->grab
);
85 handle
->handler
->event(handle
, type
, code
, value
);
87 bool filtered
= false;
89 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
) {
93 handler
= handle
->handler
;
94 if (!handler
->filter
) {
98 handler
->event(handle
, type
, code
, value
);
100 } else if (handler
->filter(handle
, type
, code
, value
))
109 * Generate software autorepeat event. Note that we take
110 * dev->event_lock here to avoid racing with input_event
111 * which may cause keys get "stuck".
113 static void input_repeat_key(unsigned long data
)
115 struct input_dev
*dev
= (void *) data
;
118 spin_lock_irqsave(&dev
->event_lock
, flags
);
120 if (test_bit(dev
->repeat_key
, dev
->key
) &&
121 is_event_supported(dev
->repeat_key
, dev
->keybit
, KEY_MAX
)) {
123 input_pass_event(dev
, EV_KEY
, dev
->repeat_key
, 2);
127 * Only send SYN_REPORT if we are not in a middle
128 * of driver parsing a new hardware packet.
129 * Otherwise assume that the driver will send
130 * SYN_REPORT once it's done.
132 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
135 if (dev
->rep
[REP_PERIOD
])
136 mod_timer(&dev
->timer
, jiffies
+
137 msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
140 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
143 static void input_start_autorepeat(struct input_dev
*dev
, int code
)
145 if (test_bit(EV_REP
, dev
->evbit
) &&
146 dev
->rep
[REP_PERIOD
] && dev
->rep
[REP_DELAY
] &&
148 dev
->repeat_key
= code
;
149 mod_timer(&dev
->timer
,
150 jiffies
+ msecs_to_jiffies(dev
->rep
[REP_DELAY
]));
154 static void input_stop_autorepeat(struct input_dev
*dev
)
156 del_timer(&dev
->timer
);
159 #define INPUT_IGNORE_EVENT 0
160 #define INPUT_PASS_TO_HANDLERS 1
161 #define INPUT_PASS_TO_DEVICE 2
162 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
164 static int input_handle_abs_event(struct input_dev
*dev
,
165 unsigned int code
, int *pval
)
170 if (code
== ABS_MT_SLOT
) {
172 * "Stage" the event; we'll flush it later, when we
173 * get actual touch data.
175 if (*pval
>= 0 && *pval
< dev
->mtsize
)
178 return INPUT_IGNORE_EVENT
;
181 is_mt_event
= code
>= ABS_MT_FIRST
&& code
<= ABS_MT_LAST
;
184 pold
= &dev
->absinfo
[code
].value
;
185 } else if (dev
->mt
) {
186 struct input_mt_slot
*mtslot
= &dev
->mt
[dev
->slot
];
187 pold
= &mtslot
->abs
[code
- ABS_MT_FIRST
];
190 * Bypass filtering for multi-touch events when
191 * not employing slots.
197 *pval
= input_defuzz_abs_event(*pval
, *pold
,
198 dev
->absinfo
[code
].fuzz
);
200 return INPUT_IGNORE_EVENT
;
205 /* Flush pending "slot" event */
206 if (is_mt_event
&& dev
->slot
!= input_abs_get_val(dev
, ABS_MT_SLOT
)) {
207 input_abs_set_val(dev
, ABS_MT_SLOT
, dev
->slot
);
208 input_pass_event(dev
, EV_ABS
, ABS_MT_SLOT
, dev
->slot
);
211 return INPUT_PASS_TO_HANDLERS
;
214 static void input_handle_event(struct input_dev
*dev
,
215 unsigned int type
, unsigned int code
, int value
)
217 int disposition
= INPUT_IGNORE_EVENT
;
224 disposition
= INPUT_PASS_TO_ALL
;
230 disposition
= INPUT_PASS_TO_HANDLERS
;
235 disposition
= INPUT_PASS_TO_HANDLERS
;
241 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
242 !!test_bit(code
, dev
->key
) != value
) {
245 __change_bit(code
, dev
->key
);
247 input_start_autorepeat(dev
, code
);
249 input_stop_autorepeat(dev
);
252 disposition
= INPUT_PASS_TO_HANDLERS
;
257 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
258 !!test_bit(code
, dev
->sw
) != value
) {
260 __change_bit(code
, dev
->sw
);
261 disposition
= INPUT_PASS_TO_HANDLERS
;
266 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
))
267 disposition
= input_handle_abs_event(dev
, code
, &value
);
272 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
273 disposition
= INPUT_PASS_TO_HANDLERS
;
278 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
279 disposition
= INPUT_PASS_TO_ALL
;
284 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
285 !!test_bit(code
, dev
->led
) != value
) {
287 __change_bit(code
, dev
->led
);
288 disposition
= INPUT_PASS_TO_ALL
;
293 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
295 if (!!test_bit(code
, dev
->snd
) != !!value
)
296 __change_bit(code
, dev
->snd
);
297 disposition
= INPUT_PASS_TO_ALL
;
302 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
303 dev
->rep
[code
] = value
;
304 disposition
= INPUT_PASS_TO_ALL
;
310 disposition
= INPUT_PASS_TO_ALL
;
314 disposition
= INPUT_PASS_TO_ALL
;
318 if (disposition
!= INPUT_IGNORE_EVENT
&& type
!= EV_SYN
)
321 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
322 dev
->event(dev
, type
, code
, value
);
324 if (disposition
& INPUT_PASS_TO_HANDLERS
)
325 input_pass_event(dev
, type
, code
, value
);
329 * input_event() - report new input event
330 * @dev: device that generated the event
331 * @type: type of the event
333 * @value: value of the event
335 * This function should be used by drivers implementing various input
336 * devices to report input events. See also input_inject_event().
338 * NOTE: input_event() may be safely used right after input device was
339 * allocated with input_allocate_device(), even before it is registered
340 * with input_register_device(), but the event will not reach any of the
341 * input handlers. Such early invocation of input_event() may be used
342 * to 'seed' initial state of a switch or initial position of absolute
345 void input_event(struct input_dev
*dev
,
346 unsigned int type
, unsigned int code
, int value
)
350 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
352 spin_lock_irqsave(&dev
->event_lock
, flags
);
353 add_input_randomness(type
, code
, value
);
354 input_handle_event(dev
, type
, code
, value
);
355 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
358 EXPORT_SYMBOL(input_event
);
361 * input_inject_event() - send input event from input handler
362 * @handle: input handle to send event through
363 * @type: type of the event
365 * @value: value of the event
367 * Similar to input_event() but will ignore event if device is
368 * "grabbed" and handle injecting event is not the one that owns
371 void input_inject_event(struct input_handle
*handle
,
372 unsigned int type
, unsigned int code
, int value
)
374 struct input_dev
*dev
= handle
->dev
;
375 struct input_handle
*grab
;
378 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
379 spin_lock_irqsave(&dev
->event_lock
, flags
);
382 grab
= rcu_dereference(dev
->grab
);
383 if (!grab
|| grab
== handle
)
384 input_handle_event(dev
, type
, code
, value
);
387 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
390 EXPORT_SYMBOL(input_inject_event
);
393 * input_alloc_absinfo - allocates array of input_absinfo structs
394 * @dev: the input device emitting absolute events
396 * If the absinfo struct the caller asked for is already allocated, this
397 * functions will not do anything.
399 void input_alloc_absinfo(struct input_dev
*dev
)
402 dev
->absinfo
= kcalloc(ABS_CNT
, sizeof(struct input_absinfo
),
405 WARN(!dev
->absinfo
, "%s(): kcalloc() failed?\n", __func__
);
407 EXPORT_SYMBOL(input_alloc_absinfo
);
409 void input_set_abs_params(struct input_dev
*dev
, unsigned int axis
,
410 int min
, int max
, int fuzz
, int flat
)
412 struct input_absinfo
*absinfo
;
414 input_alloc_absinfo(dev
);
418 absinfo
= &dev
->absinfo
[axis
];
419 absinfo
->minimum
= min
;
420 absinfo
->maximum
= max
;
421 absinfo
->fuzz
= fuzz
;
422 absinfo
->flat
= flat
;
424 dev
->absbit
[BIT_WORD(axis
)] |= BIT_MASK(axis
);
426 EXPORT_SYMBOL(input_set_abs_params
);
430 * input_grab_device - grabs device for exclusive use
431 * @handle: input handle that wants to own the device
433 * When a device is grabbed by an input handle all events generated by
434 * the device are delivered only to this handle. Also events injected
435 * by other input handles are ignored while device is grabbed.
437 int input_grab_device(struct input_handle
*handle
)
439 struct input_dev
*dev
= handle
->dev
;
442 retval
= mutex_lock_interruptible(&dev
->mutex
);
451 rcu_assign_pointer(dev
->grab
, handle
);
455 mutex_unlock(&dev
->mutex
);
458 EXPORT_SYMBOL(input_grab_device
);
460 static void __input_release_device(struct input_handle
*handle
)
462 struct input_dev
*dev
= handle
->dev
;
464 if (dev
->grab
== handle
) {
465 rcu_assign_pointer(dev
->grab
, NULL
);
466 /* Make sure input_pass_event() notices that grab is gone */
469 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
470 if (handle
->open
&& handle
->handler
->start
)
471 handle
->handler
->start(handle
);
476 * input_release_device - release previously grabbed device
477 * @handle: input handle that owns the device
479 * Releases previously grabbed device so that other input handles can
480 * start receiving input events. Upon release all handlers attached
481 * to the device have their start() method called so they have a change
482 * to synchronize device state with the rest of the system.
484 void input_release_device(struct input_handle
*handle
)
486 struct input_dev
*dev
= handle
->dev
;
488 mutex_lock(&dev
->mutex
);
489 __input_release_device(handle
);
490 mutex_unlock(&dev
->mutex
);
492 EXPORT_SYMBOL(input_release_device
);
495 * input_open_device - open input device
496 * @handle: handle through which device is being accessed
498 * This function should be called by input handlers when they
499 * want to start receive events from given input device.
501 int input_open_device(struct input_handle
*handle
)
503 struct input_dev
*dev
= handle
->dev
;
506 retval
= mutex_lock_interruptible(&dev
->mutex
);
510 if (dev
->going_away
) {
517 if (!dev
->users
++ && dev
->open
)
518 retval
= dev
->open(dev
);
522 if (!--handle
->open
) {
524 * Make sure we are not delivering any more events
525 * through this handle
532 mutex_unlock(&dev
->mutex
);
535 EXPORT_SYMBOL(input_open_device
);
537 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
539 struct input_dev
*dev
= handle
->dev
;
542 retval
= mutex_lock_interruptible(&dev
->mutex
);
547 retval
= dev
->flush(dev
, file
);
549 mutex_unlock(&dev
->mutex
);
552 EXPORT_SYMBOL(input_flush_device
);
555 * input_close_device - close input device
556 * @handle: handle through which device is being accessed
558 * This function should be called by input handlers when they
559 * want to stop receive events from given input device.
561 void input_close_device(struct input_handle
*handle
)
563 struct input_dev
*dev
= handle
->dev
;
565 mutex_lock(&dev
->mutex
);
567 __input_release_device(handle
);
569 if (!--dev
->users
&& dev
->close
)
572 if (!--handle
->open
) {
574 * synchronize_rcu() makes sure that input_pass_event()
575 * completed and that no more input events are delivered
576 * through this handle
581 mutex_unlock(&dev
->mutex
);
583 EXPORT_SYMBOL(input_close_device
);
586 * Simulate keyup events for all keys that are marked as pressed.
587 * The function must be called with dev->event_lock held.
589 static void input_dev_release_keys(struct input_dev
*dev
)
593 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
594 for (code
= 0; code
<= KEY_MAX
; code
++) {
595 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
596 __test_and_clear_bit(code
, dev
->key
)) {
597 input_pass_event(dev
, EV_KEY
, code
, 0);
600 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
605 * Prepare device for unregistering
607 static void input_disconnect_device(struct input_dev
*dev
)
609 struct input_handle
*handle
;
612 * Mark device as going away. Note that we take dev->mutex here
613 * not to protect access to dev->going_away but rather to ensure
614 * that there are no threads in the middle of input_open_device()
616 mutex_lock(&dev
->mutex
);
617 dev
->going_away
= true;
618 mutex_unlock(&dev
->mutex
);
620 spin_lock_irq(&dev
->event_lock
);
623 * Simulate keyup events for all pressed keys so that handlers
624 * are not left with "stuck" keys. The driver may continue
625 * generate events even after we done here but they will not
626 * reach any handlers.
628 input_dev_release_keys(dev
);
630 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
633 spin_unlock_irq(&dev
->event_lock
);
637 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
638 * @ke: keymap entry containing scancode to be converted.
639 * @scancode: pointer to the location where converted scancode should
642 * This function is used to convert scancode stored in &struct keymap_entry
643 * into scalar form understood by legacy keymap handling methods. These
644 * methods expect scancodes to be represented as 'unsigned int'.
646 int input_scancode_to_scalar(const struct input_keymap_entry
*ke
,
647 unsigned int *scancode
)
651 *scancode
= *((u8
*)ke
->scancode
);
655 *scancode
= *((u16
*)ke
->scancode
);
659 *scancode
= *((u32
*)ke
->scancode
);
668 EXPORT_SYMBOL(input_scancode_to_scalar
);
671 * Those routines handle the default case where no [gs]etkeycode() is
672 * defined. In this case, an array indexed by the scancode is used.
675 static unsigned int input_fetch_keycode(struct input_dev
*dev
,
678 switch (dev
->keycodesize
) {
680 return ((u8
*)dev
->keycode
)[index
];
683 return ((u16
*)dev
->keycode
)[index
];
686 return ((u32
*)dev
->keycode
)[index
];
690 static int input_default_getkeycode(struct input_dev
*dev
,
691 struct input_keymap_entry
*ke
)
696 if (!dev
->keycodesize
)
699 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
)
702 error
= input_scancode_to_scalar(ke
, &index
);
707 if (index
>= dev
->keycodemax
)
710 ke
->keycode
= input_fetch_keycode(dev
, index
);
712 ke
->len
= sizeof(index
);
713 memcpy(ke
->scancode
, &index
, sizeof(index
));
718 static int input_default_setkeycode(struct input_dev
*dev
,
719 const struct input_keymap_entry
*ke
,
720 unsigned int *old_keycode
)
726 if (!dev
->keycodesize
)
729 if (ke
->flags
& INPUT_KEYMAP_BY_INDEX
) {
732 error
= input_scancode_to_scalar(ke
, &index
);
737 if (index
>= dev
->keycodemax
)
740 if (dev
->keycodesize
< sizeof(ke
->keycode
) &&
741 (ke
->keycode
>> (dev
->keycodesize
* 8)))
744 switch (dev
->keycodesize
) {
746 u8
*k
= (u8
*)dev
->keycode
;
747 *old_keycode
= k
[index
];
748 k
[index
] = ke
->keycode
;
752 u16
*k
= (u16
*)dev
->keycode
;
753 *old_keycode
= k
[index
];
754 k
[index
] = ke
->keycode
;
758 u32
*k
= (u32
*)dev
->keycode
;
759 *old_keycode
= k
[index
];
760 k
[index
] = ke
->keycode
;
765 __clear_bit(*old_keycode
, dev
->keybit
);
766 __set_bit(ke
->keycode
, dev
->keybit
);
768 for (i
= 0; i
< dev
->keycodemax
; i
++) {
769 if (input_fetch_keycode(dev
, i
) == *old_keycode
) {
770 __set_bit(*old_keycode
, dev
->keybit
);
771 break; /* Setting the bit twice is useless, so break */
779 * input_get_keycode - retrieve keycode currently mapped to a given scancode
780 * @dev: input device which keymap is being queried
783 * This function should be called by anyone interested in retrieving current
784 * keymap. Presently evdev handlers use it.
786 int input_get_keycode(struct input_dev
*dev
, struct input_keymap_entry
*ke
)
791 spin_lock_irqsave(&dev
->event_lock
, flags
);
793 if (dev
->getkeycode
) {
795 * Support for legacy drivers, that don't implement the new
798 u32 scancode
= ke
->index
;
800 memcpy(ke
->scancode
, &scancode
, sizeof(scancode
));
801 ke
->len
= sizeof(scancode
);
802 retval
= dev
->getkeycode(dev
, scancode
, &ke
->keycode
);
804 retval
= dev
->getkeycode_new(dev
, ke
);
807 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
810 EXPORT_SYMBOL(input_get_keycode
);
813 * input_set_keycode - attribute a keycode to a given scancode
814 * @dev: input device which keymap is being updated
815 * @ke: new keymap entry
817 * This function should be called by anyone needing to update current
818 * keymap. Presently keyboard and evdev handlers use it.
820 int input_set_keycode(struct input_dev
*dev
,
821 const struct input_keymap_entry
*ke
)
824 unsigned int old_keycode
;
827 if (ke
->keycode
> KEY_MAX
)
830 spin_lock_irqsave(&dev
->event_lock
, flags
);
832 if (dev
->setkeycode
) {
834 * Support for legacy drivers, that don't implement the new
837 unsigned int scancode
;
839 retval
= input_scancode_to_scalar(ke
, &scancode
);
844 * We need to know the old scancode, in order to generate a
845 * keyup effect, if the set operation happens successfully
847 if (!dev
->getkeycode
) {
852 retval
= dev
->getkeycode(dev
, scancode
, &old_keycode
);
856 retval
= dev
->setkeycode(dev
, scancode
, ke
->keycode
);
858 retval
= dev
->setkeycode_new(dev
, ke
, &old_keycode
);
864 /* Make sure KEY_RESERVED did not get enabled. */
865 __clear_bit(KEY_RESERVED
, dev
->keybit
);
868 * Simulate keyup event if keycode is not present
869 * in the keymap anymore
871 if (test_bit(EV_KEY
, dev
->evbit
) &&
872 !is_event_supported(old_keycode
, dev
->keybit
, KEY_MAX
) &&
873 __test_and_clear_bit(old_keycode
, dev
->key
)) {
875 input_pass_event(dev
, EV_KEY
, old_keycode
, 0);
877 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
881 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
885 EXPORT_SYMBOL(input_set_keycode
);
887 #define MATCH_BIT(bit, max) \
888 for (i = 0; i < BITS_TO_LONGS(max); i++) \
889 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
891 if (i != BITS_TO_LONGS(max)) \
894 static const struct input_device_id
*input_match_device(struct input_handler
*handler
,
895 struct input_dev
*dev
)
897 const struct input_device_id
*id
;
900 for (id
= handler
->id_table
; id
->flags
|| id
->driver_info
; id
++) {
902 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
903 if (id
->bustype
!= dev
->id
.bustype
)
906 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
907 if (id
->vendor
!= dev
->id
.vendor
)
910 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
911 if (id
->product
!= dev
->id
.product
)
914 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
915 if (id
->version
!= dev
->id
.version
)
918 MATCH_BIT(evbit
, EV_MAX
);
919 MATCH_BIT(keybit
, KEY_MAX
);
920 MATCH_BIT(relbit
, REL_MAX
);
921 MATCH_BIT(absbit
, ABS_MAX
);
922 MATCH_BIT(mscbit
, MSC_MAX
);
923 MATCH_BIT(ledbit
, LED_MAX
);
924 MATCH_BIT(sndbit
, SND_MAX
);
925 MATCH_BIT(ffbit
, FF_MAX
);
926 MATCH_BIT(swbit
, SW_MAX
);
928 if (!handler
->match
|| handler
->match(handler
, dev
))
935 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
937 const struct input_device_id
*id
;
940 id
= input_match_device(handler
, dev
);
944 error
= handler
->connect(handler
, dev
, id
);
945 if (error
&& error
!= -ENODEV
)
947 "input: failed to attach handler %s to device %s, "
949 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
956 static int input_bits_to_string(char *buf
, int buf_size
,
957 unsigned long bits
, bool skip_empty
)
961 if (INPUT_COMPAT_TEST
) {
962 u32 dword
= bits
>> 32;
963 if (dword
|| !skip_empty
)
964 len
+= snprintf(buf
, buf_size
, "%x ", dword
);
966 dword
= bits
& 0xffffffffUL
;
967 if (dword
|| !skip_empty
|| len
)
968 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
971 if (bits
|| !skip_empty
)
972 len
+= snprintf(buf
, buf_size
, "%lx", bits
);
978 #else /* !CONFIG_COMPAT */
980 static int input_bits_to_string(char *buf
, int buf_size
,
981 unsigned long bits
, bool skip_empty
)
983 return bits
|| !skip_empty
?
984 snprintf(buf
, buf_size
, "%lx", bits
) : 0;
989 #ifdef CONFIG_PROC_FS
991 static struct proc_dir_entry
*proc_bus_input_dir
;
992 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
993 static int input_devices_state
;
995 static inline void input_wakeup_procfs_readers(void)
997 input_devices_state
++;
998 wake_up(&input_devices_poll_wait
);
1001 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
1003 poll_wait(file
, &input_devices_poll_wait
, wait
);
1004 if (file
->f_version
!= input_devices_state
) {
1005 file
->f_version
= input_devices_state
;
1006 return POLLIN
| POLLRDNORM
;
1012 union input_seq_state
{
1015 bool mutex_acquired
;
1020 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1022 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1025 /* We need to fit into seq->private pointer */
1026 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1028 error
= mutex_lock_interruptible(&input_mutex
);
1030 state
->mutex_acquired
= false;
1031 return ERR_PTR(error
);
1034 state
->mutex_acquired
= true;
1036 return seq_list_start(&input_dev_list
, *pos
);
1039 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1041 return seq_list_next(v
, &input_dev_list
, pos
);
1044 static void input_seq_stop(struct seq_file
*seq
, void *v
)
1046 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1048 if (state
->mutex_acquired
)
1049 mutex_unlock(&input_mutex
);
1052 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
1053 unsigned long *bitmap
, int max
)
1056 bool skip_empty
= true;
1059 seq_printf(seq
, "B: %s=", name
);
1061 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1062 if (input_bits_to_string(buf
, sizeof(buf
),
1063 bitmap
[i
], skip_empty
)) {
1065 seq_printf(seq
, "%s%s", buf
, i
> 0 ? " " : "");
1070 * If no output was produced print a single 0.
1075 seq_putc(seq
, '\n');
1078 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
1080 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
1081 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1082 struct input_handle
*handle
;
1084 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1085 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
1087 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
1088 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
1089 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
1090 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
1091 seq_printf(seq
, "H: Handlers=");
1093 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
1094 seq_printf(seq
, "%s ", handle
->name
);
1095 seq_putc(seq
, '\n');
1097 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
1098 if (test_bit(EV_KEY
, dev
->evbit
))
1099 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
1100 if (test_bit(EV_REL
, dev
->evbit
))
1101 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
1102 if (test_bit(EV_ABS
, dev
->evbit
))
1103 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
1104 if (test_bit(EV_MSC
, dev
->evbit
))
1105 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
1106 if (test_bit(EV_LED
, dev
->evbit
))
1107 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
1108 if (test_bit(EV_SND
, dev
->evbit
))
1109 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
1110 if (test_bit(EV_FF
, dev
->evbit
))
1111 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
1112 if (test_bit(EV_SW
, dev
->evbit
))
1113 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
1115 seq_putc(seq
, '\n');
1121 static const struct seq_operations input_devices_seq_ops
= {
1122 .start
= input_devices_seq_start
,
1123 .next
= input_devices_seq_next
,
1124 .stop
= input_seq_stop
,
1125 .show
= input_devices_seq_show
,
1128 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
1130 return seq_open(file
, &input_devices_seq_ops
);
1133 static const struct file_operations input_devices_fileops
= {
1134 .owner
= THIS_MODULE
,
1135 .open
= input_proc_devices_open
,
1136 .poll
= input_proc_devices_poll
,
1138 .llseek
= seq_lseek
,
1139 .release
= seq_release
,
1142 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1144 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1147 /* We need to fit into seq->private pointer */
1148 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
1150 error
= mutex_lock_interruptible(&input_mutex
);
1152 state
->mutex_acquired
= false;
1153 return ERR_PTR(error
);
1156 state
->mutex_acquired
= true;
1159 return seq_list_start(&input_handler_list
, *pos
);
1162 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1164 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1166 state
->pos
= *pos
+ 1;
1167 return seq_list_next(v
, &input_handler_list
, pos
);
1170 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
1172 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
1173 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
1175 seq_printf(seq
, "N: Number=%u Name=%s", state
->pos
, handler
->name
);
1176 if (handler
->filter
)
1177 seq_puts(seq
, " (filter)");
1179 seq_printf(seq
, " Minor=%d", handler
->minor
);
1180 seq_putc(seq
, '\n');
1185 static const struct seq_operations input_handlers_seq_ops
= {
1186 .start
= input_handlers_seq_start
,
1187 .next
= input_handlers_seq_next
,
1188 .stop
= input_seq_stop
,
1189 .show
= input_handlers_seq_show
,
1192 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
1194 return seq_open(file
, &input_handlers_seq_ops
);
1197 static const struct file_operations input_handlers_fileops
= {
1198 .owner
= THIS_MODULE
,
1199 .open
= input_proc_handlers_open
,
1201 .llseek
= seq_lseek
,
1202 .release
= seq_release
,
1205 static int __init
input_proc_init(void)
1207 struct proc_dir_entry
*entry
;
1209 proc_bus_input_dir
= proc_mkdir("bus/input", NULL
);
1210 if (!proc_bus_input_dir
)
1213 entry
= proc_create("devices", 0, proc_bus_input_dir
,
1214 &input_devices_fileops
);
1218 entry
= proc_create("handlers", 0, proc_bus_input_dir
,
1219 &input_handlers_fileops
);
1225 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
1226 fail1
: remove_proc_entry("bus/input", NULL
);
1230 static void input_proc_exit(void)
1232 remove_proc_entry("devices", proc_bus_input_dir
);
1233 remove_proc_entry("handlers", proc_bus_input_dir
);
1234 remove_proc_entry("bus/input", NULL
);
1237 #else /* !CONFIG_PROC_FS */
1238 static inline void input_wakeup_procfs_readers(void) { }
1239 static inline int input_proc_init(void) { return 0; }
1240 static inline void input_proc_exit(void) { }
1243 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1244 static ssize_t input_dev_show_##name(struct device *dev, \
1245 struct device_attribute *attr, \
1248 struct input_dev *input_dev = to_input_dev(dev); \
1250 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1251 input_dev->name ? input_dev->name : ""); \
1253 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1255 INPUT_DEV_STRING_ATTR_SHOW(name
);
1256 INPUT_DEV_STRING_ATTR_SHOW(phys
);
1257 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
1259 static int input_print_modalias_bits(char *buf
, int size
,
1260 char name
, unsigned long *bm
,
1261 unsigned int min_bit
, unsigned int max_bit
)
1265 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
1266 for (i
= min_bit
; i
< max_bit
; i
++)
1267 if (bm
[BIT_WORD(i
)] & BIT_MASK(i
))
1268 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
1272 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
1277 len
= snprintf(buf
, max(size
, 0),
1278 "input:b%04Xv%04Xp%04Xe%04X-",
1279 id
->id
.bustype
, id
->id
.vendor
,
1280 id
->id
.product
, id
->id
.version
);
1282 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1283 'e', id
->evbit
, 0, EV_MAX
);
1284 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1285 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
1286 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1287 'r', id
->relbit
, 0, REL_MAX
);
1288 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1289 'a', id
->absbit
, 0, ABS_MAX
);
1290 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1291 'm', id
->mscbit
, 0, MSC_MAX
);
1292 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1293 'l', id
->ledbit
, 0, LED_MAX
);
1294 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1295 's', id
->sndbit
, 0, SND_MAX
);
1296 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1297 'f', id
->ffbit
, 0, FF_MAX
);
1298 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1299 'w', id
->swbit
, 0, SW_MAX
);
1302 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
1307 static ssize_t
input_dev_show_modalias(struct device
*dev
,
1308 struct device_attribute
*attr
,
1311 struct input_dev
*id
= to_input_dev(dev
);
1314 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
1316 return min_t(int, len
, PAGE_SIZE
);
1318 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
1320 static struct attribute
*input_dev_attrs
[] = {
1321 &dev_attr_name
.attr
,
1322 &dev_attr_phys
.attr
,
1323 &dev_attr_uniq
.attr
,
1324 &dev_attr_modalias
.attr
,
1328 static struct attribute_group input_dev_attr_group
= {
1329 .attrs
= input_dev_attrs
,
1332 #define INPUT_DEV_ID_ATTR(name) \
1333 static ssize_t input_dev_show_id_##name(struct device *dev, \
1334 struct device_attribute *attr, \
1337 struct input_dev *input_dev = to_input_dev(dev); \
1338 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1340 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1342 INPUT_DEV_ID_ATTR(bustype
);
1343 INPUT_DEV_ID_ATTR(vendor
);
1344 INPUT_DEV_ID_ATTR(product
);
1345 INPUT_DEV_ID_ATTR(version
);
1347 static struct attribute
*input_dev_id_attrs
[] = {
1348 &dev_attr_bustype
.attr
,
1349 &dev_attr_vendor
.attr
,
1350 &dev_attr_product
.attr
,
1351 &dev_attr_version
.attr
,
1355 static struct attribute_group input_dev_id_attr_group
= {
1357 .attrs
= input_dev_id_attrs
,
1360 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1361 int max
, int add_cr
)
1365 bool skip_empty
= true;
1367 for (i
= BITS_TO_LONGS(max
) - 1; i
>= 0; i
--) {
1368 len
+= input_bits_to_string(buf
+ len
, max(buf_size
- len
, 0),
1369 bitmap
[i
], skip_empty
);
1373 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), " ");
1378 * If no output was produced print a single 0.
1381 len
= snprintf(buf
, buf_size
, "%d", 0);
1384 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1389 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1390 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1391 struct device_attribute *attr, \
1394 struct input_dev *input_dev = to_input_dev(dev); \
1395 int len = input_print_bitmap(buf, PAGE_SIZE, \
1396 input_dev->bm##bit, ev##_MAX, \
1398 return min_t(int, len, PAGE_SIZE); \
1400 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1402 INPUT_DEV_CAP_ATTR(EV
, ev
);
1403 INPUT_DEV_CAP_ATTR(KEY
, key
);
1404 INPUT_DEV_CAP_ATTR(REL
, rel
);
1405 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1406 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1407 INPUT_DEV_CAP_ATTR(LED
, led
);
1408 INPUT_DEV_CAP_ATTR(SND
, snd
);
1409 INPUT_DEV_CAP_ATTR(FF
, ff
);
1410 INPUT_DEV_CAP_ATTR(SW
, sw
);
1412 static struct attribute
*input_dev_caps_attrs
[] = {
1425 static struct attribute_group input_dev_caps_attr_group
= {
1426 .name
= "capabilities",
1427 .attrs
= input_dev_caps_attrs
,
1430 static const struct attribute_group
*input_dev_attr_groups
[] = {
1431 &input_dev_attr_group
,
1432 &input_dev_id_attr_group
,
1433 &input_dev_caps_attr_group
,
1437 static void input_dev_release(struct device
*device
)
1439 struct input_dev
*dev
= to_input_dev(device
);
1441 input_ff_destroy(dev
);
1442 input_mt_destroy_slots(dev
);
1443 kfree(dev
->absinfo
);
1446 module_put(THIS_MODULE
);
1450 * Input uevent interface - loading event handlers based on
1453 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1454 const char *name
, unsigned long *bitmap
, int max
)
1458 if (add_uevent_var(env
, "%s=", name
))
1461 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1462 sizeof(env
->buf
) - env
->buflen
,
1463 bitmap
, max
, false);
1464 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1471 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1472 struct input_dev
*dev
)
1476 if (add_uevent_var(env
, "MODALIAS="))
1479 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1480 sizeof(env
->buf
) - env
->buflen
,
1482 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1489 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1491 int err = add_uevent_var(env, fmt, val); \
1496 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1498 int err = input_add_uevent_bm_var(env, name, bm, max); \
1503 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1505 int err = input_add_uevent_modalias_var(env, dev); \
1510 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1512 struct input_dev
*dev
= to_input_dev(device
);
1514 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1515 dev
->id
.bustype
, dev
->id
.vendor
,
1516 dev
->id
.product
, dev
->id
.version
);
1518 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1520 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1522 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1524 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1525 if (test_bit(EV_KEY
, dev
->evbit
))
1526 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1527 if (test_bit(EV_REL
, dev
->evbit
))
1528 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1529 if (test_bit(EV_ABS
, dev
->evbit
))
1530 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1531 if (test_bit(EV_MSC
, dev
->evbit
))
1532 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1533 if (test_bit(EV_LED
, dev
->evbit
))
1534 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1535 if (test_bit(EV_SND
, dev
->evbit
))
1536 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1537 if (test_bit(EV_FF
, dev
->evbit
))
1538 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1539 if (test_bit(EV_SW
, dev
->evbit
))
1540 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1542 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1547 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1552 if (!test_bit(EV_##type, dev->evbit)) \
1555 for (i = 0; i < type##_MAX; i++) { \
1556 if (!test_bit(i, dev->bits##bit)) \
1559 active = test_bit(i, dev->bits); \
1560 if (!active && !on) \
1563 dev->event(dev, EV_##type, i, on ? active : 0); \
1567 static void input_dev_toggle(struct input_dev
*dev
, bool activate
)
1572 INPUT_DO_TOGGLE(dev
, LED
, led
, activate
);
1573 INPUT_DO_TOGGLE(dev
, SND
, snd
, activate
);
1575 if (activate
&& test_bit(EV_REP
, dev
->evbit
)) {
1576 dev
->event(dev
, EV_REP
, REP_PERIOD
, dev
->rep
[REP_PERIOD
]);
1577 dev
->event(dev
, EV_REP
, REP_DELAY
, dev
->rep
[REP_DELAY
]);
1582 * input_reset_device() - reset/restore the state of input device
1583 * @dev: input device whose state needs to be reset
1585 * This function tries to reset the state of an opened input device and
1586 * bring internal state and state if the hardware in sync with each other.
1587 * We mark all keys as released, restore LED state, repeat rate, etc.
1589 void input_reset_device(struct input_dev
*dev
)
1591 mutex_lock(&dev
->mutex
);
1594 input_dev_toggle(dev
, true);
1597 * Keys that have been pressed at suspend time are unlikely
1598 * to be still pressed when we resume.
1600 spin_lock_irq(&dev
->event_lock
);
1601 input_dev_release_keys(dev
);
1602 spin_unlock_irq(&dev
->event_lock
);
1605 mutex_unlock(&dev
->mutex
);
1607 EXPORT_SYMBOL(input_reset_device
);
1610 static int input_dev_suspend(struct device
*dev
)
1612 struct input_dev
*input_dev
= to_input_dev(dev
);
1614 mutex_lock(&input_dev
->mutex
);
1616 if (input_dev
->users
)
1617 input_dev_toggle(input_dev
, false);
1619 mutex_unlock(&input_dev
->mutex
);
1624 static int input_dev_resume(struct device
*dev
)
1626 struct input_dev
*input_dev
= to_input_dev(dev
);
1628 input_reset_device(input_dev
);
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_mt_create_slots() - create MT input slots
1714 * @dev: input device supporting MT events and finger tracking
1715 * @num_slots: number of slots used by the device
1717 * This function allocates all necessary memory for MT slot handling in the
1718 * input device, and adds ABS_MT_SLOT to the device capabilities. All slots
1719 * are initially marked as unused by setting ABS_MT_TRACKING_ID to -1.
1721 int input_mt_create_slots(struct input_dev
*dev
, unsigned int num_slots
)
1728 dev
->mt
= kcalloc(num_slots
, sizeof(struct input_mt_slot
), GFP_KERNEL
);
1732 dev
->mtsize
= num_slots
;
1733 input_set_abs_params(dev
, ABS_MT_SLOT
, 0, num_slots
- 1, 0, 0);
1735 /* Mark slots as 'unused' */
1736 for (i
= 0; i
< num_slots
; i
++)
1737 dev
->mt
[i
].abs
[ABS_MT_TRACKING_ID
- ABS_MT_FIRST
] = -1;
1741 EXPORT_SYMBOL(input_mt_create_slots
);
1744 * input_mt_destroy_slots() - frees the MT slots of the input device
1745 * @dev: input device with allocated MT slots
1747 * This function is only needed in error path as the input core will
1748 * automatically free the MT slots when the device is destroyed.
1750 void input_mt_destroy_slots(struct input_dev
*dev
)
1756 EXPORT_SYMBOL(input_mt_destroy_slots
);
1759 * input_set_capability - mark device as capable of a certain event
1760 * @dev: device that is capable of emitting or accepting event
1761 * @type: type of the event (EV_KEY, EV_REL, etc...)
1764 * In addition to setting up corresponding bit in appropriate capability
1765 * bitmap the function also adjusts dev->evbit.
1767 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1771 __set_bit(code
, dev
->keybit
);
1775 __set_bit(code
, dev
->relbit
);
1779 __set_bit(code
, dev
->absbit
);
1783 __set_bit(code
, dev
->mscbit
);
1787 __set_bit(code
, dev
->swbit
);
1791 __set_bit(code
, dev
->ledbit
);
1795 __set_bit(code
, dev
->sndbit
);
1799 __set_bit(code
, dev
->ffbit
);
1808 "input_set_capability: unknown type %u (code %u)\n",
1814 __set_bit(type
, dev
->evbit
);
1816 EXPORT_SYMBOL(input_set_capability
);
1818 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1820 if (!test_bit(EV_##type, dev->evbit)) \
1821 memset(dev->bits##bit, 0, \
1822 sizeof(dev->bits##bit)); \
1825 static void input_cleanse_bitmasks(struct input_dev
*dev
)
1827 INPUT_CLEANSE_BITMASK(dev
, KEY
, key
);
1828 INPUT_CLEANSE_BITMASK(dev
, REL
, rel
);
1829 INPUT_CLEANSE_BITMASK(dev
, ABS
, abs
);
1830 INPUT_CLEANSE_BITMASK(dev
, MSC
, msc
);
1831 INPUT_CLEANSE_BITMASK(dev
, LED
, led
);
1832 INPUT_CLEANSE_BITMASK(dev
, SND
, snd
);
1833 INPUT_CLEANSE_BITMASK(dev
, FF
, ff
);
1834 INPUT_CLEANSE_BITMASK(dev
, SW
, sw
);
1838 * input_register_device - register device with input core
1839 * @dev: device to be registered
1841 * This function registers device with input core. The device must be
1842 * allocated with input_allocate_device() and all it's capabilities
1843 * set up before registering.
1844 * If function fails the device must be freed with input_free_device().
1845 * Once device has been successfully registered it can be unregistered
1846 * with input_unregister_device(); input_free_device() should not be
1847 * called in this case.
1849 int input_register_device(struct input_dev
*dev
)
1851 static atomic_t input_no
= ATOMIC_INIT(0);
1852 struct input_handler
*handler
;
1856 /* Every input device generates EV_SYN/SYN_REPORT events. */
1857 __set_bit(EV_SYN
, dev
->evbit
);
1859 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1860 __clear_bit(KEY_RESERVED
, dev
->keybit
);
1862 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1863 input_cleanse_bitmasks(dev
);
1866 * If delay and period are pre-set by the driver, then autorepeating
1867 * is handled by the driver itself and we don't do it in input.c.
1869 init_timer(&dev
->timer
);
1870 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
1871 dev
->timer
.data
= (long) dev
;
1872 dev
->timer
.function
= input_repeat_key
;
1873 dev
->rep
[REP_DELAY
] = 250;
1874 dev
->rep
[REP_PERIOD
] = 33;
1877 if (!dev
->getkeycode
&& !dev
->getkeycode_new
)
1878 dev
->getkeycode_new
= input_default_getkeycode
;
1880 if (!dev
->setkeycode
&& !dev
->setkeycode_new
)
1881 dev
->setkeycode_new
= input_default_setkeycode
;
1883 dev_set_name(&dev
->dev
, "input%ld",
1884 (unsigned long) atomic_inc_return(&input_no
) - 1);
1886 error
= device_add(&dev
->dev
);
1890 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1891 printk(KERN_INFO
"input: %s as %s\n",
1892 dev
->name
? dev
->name
: "Unspecified device", path
? path
: "N/A");
1895 error
= mutex_lock_interruptible(&input_mutex
);
1897 device_del(&dev
->dev
);
1901 list_add_tail(&dev
->node
, &input_dev_list
);
1903 list_for_each_entry(handler
, &input_handler_list
, node
)
1904 input_attach_handler(dev
, handler
);
1906 input_wakeup_procfs_readers();
1908 mutex_unlock(&input_mutex
);
1912 EXPORT_SYMBOL(input_register_device
);
1915 * input_unregister_device - unregister previously registered device
1916 * @dev: device to be unregistered
1918 * This function unregisters an input device. Once device is unregistered
1919 * the caller should not try to access it as it may get freed at any moment.
1921 void input_unregister_device(struct input_dev
*dev
)
1923 struct input_handle
*handle
, *next
;
1925 input_disconnect_device(dev
);
1927 mutex_lock(&input_mutex
);
1929 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1930 handle
->handler
->disconnect(handle
);
1931 WARN_ON(!list_empty(&dev
->h_list
));
1933 del_timer_sync(&dev
->timer
);
1934 list_del_init(&dev
->node
);
1936 input_wakeup_procfs_readers();
1938 mutex_unlock(&input_mutex
);
1940 device_unregister(&dev
->dev
);
1942 EXPORT_SYMBOL(input_unregister_device
);
1945 * input_register_handler - register a new input handler
1946 * @handler: handler to be registered
1948 * This function registers a new input handler (interface) for input
1949 * devices in the system and attaches it to all input devices that
1950 * are compatible with the handler.
1952 int input_register_handler(struct input_handler
*handler
)
1954 struct input_dev
*dev
;
1957 retval
= mutex_lock_interruptible(&input_mutex
);
1961 INIT_LIST_HEAD(&handler
->h_list
);
1963 if (handler
->fops
!= NULL
) {
1964 if (input_table
[handler
->minor
>> 5]) {
1968 input_table
[handler
->minor
>> 5] = handler
;
1971 list_add_tail(&handler
->node
, &input_handler_list
);
1973 list_for_each_entry(dev
, &input_dev_list
, node
)
1974 input_attach_handler(dev
, handler
);
1976 input_wakeup_procfs_readers();
1979 mutex_unlock(&input_mutex
);
1982 EXPORT_SYMBOL(input_register_handler
);
1985 * input_unregister_handler - unregisters an input handler
1986 * @handler: handler to be unregistered
1988 * This function disconnects a handler from its input devices and
1989 * removes it from lists of known handlers.
1991 void input_unregister_handler(struct input_handler
*handler
)
1993 struct input_handle
*handle
, *next
;
1995 mutex_lock(&input_mutex
);
1997 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
1998 handler
->disconnect(handle
);
1999 WARN_ON(!list_empty(&handler
->h_list
));
2001 list_del_init(&handler
->node
);
2003 if (handler
->fops
!= NULL
)
2004 input_table
[handler
->minor
>> 5] = NULL
;
2006 input_wakeup_procfs_readers();
2008 mutex_unlock(&input_mutex
);
2010 EXPORT_SYMBOL(input_unregister_handler
);
2013 * input_handler_for_each_handle - handle iterator
2014 * @handler: input handler to iterate
2015 * @data: data for the callback
2016 * @fn: function to be called for each handle
2018 * Iterate over @bus's list of devices, and call @fn for each, passing
2019 * it @data and stop when @fn returns a non-zero value. The function is
2020 * using RCU to traverse the list and therefore may be usind in atonic
2021 * contexts. The @fn callback is invoked from RCU critical section and
2022 * thus must not sleep.
2024 int input_handler_for_each_handle(struct input_handler
*handler
, void *data
,
2025 int (*fn
)(struct input_handle
*, void *))
2027 struct input_handle
*handle
;
2032 list_for_each_entry_rcu(handle
, &handler
->h_list
, h_node
) {
2033 retval
= fn(handle
, data
);
2042 EXPORT_SYMBOL(input_handler_for_each_handle
);
2045 * input_register_handle - register a new input handle
2046 * @handle: handle to register
2048 * This function puts a new input handle onto device's
2049 * and handler's lists so that events can flow through
2050 * it once it is opened using input_open_device().
2052 * This function is supposed to be called from handler's
2055 int input_register_handle(struct input_handle
*handle
)
2057 struct input_handler
*handler
= handle
->handler
;
2058 struct input_dev
*dev
= handle
->dev
;
2062 * We take dev->mutex here to prevent race with
2063 * input_release_device().
2065 error
= mutex_lock_interruptible(&dev
->mutex
);
2070 * Filters go to the head of the list, normal handlers
2073 if (handler
->filter
)
2074 list_add_rcu(&handle
->d_node
, &dev
->h_list
);
2076 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
2078 mutex_unlock(&dev
->mutex
);
2081 * Since we are supposed to be called from ->connect()
2082 * which is mutually exclusive with ->disconnect()
2083 * we can't be racing with input_unregister_handle()
2084 * and so separate lock is not needed here.
2086 list_add_tail_rcu(&handle
->h_node
, &handler
->h_list
);
2089 handler
->start(handle
);
2093 EXPORT_SYMBOL(input_register_handle
);
2096 * input_unregister_handle - unregister an input handle
2097 * @handle: handle to unregister
2099 * This function removes input handle from device's
2100 * and handler's lists.
2102 * This function is supposed to be called from handler's
2103 * disconnect() method.
2105 void input_unregister_handle(struct input_handle
*handle
)
2107 struct input_dev
*dev
= handle
->dev
;
2109 list_del_rcu(&handle
->h_node
);
2112 * Take dev->mutex to prevent race with input_release_device().
2114 mutex_lock(&dev
->mutex
);
2115 list_del_rcu(&handle
->d_node
);
2116 mutex_unlock(&dev
->mutex
);
2120 EXPORT_SYMBOL(input_unregister_handle
);
2122 static int input_open_file(struct inode
*inode
, struct file
*file
)
2124 struct input_handler
*handler
;
2125 const struct file_operations
*old_fops
, *new_fops
= NULL
;
2128 err
= mutex_lock_interruptible(&input_mutex
);
2132 /* No load-on-demand here? */
2133 handler
= input_table
[iminor(inode
) >> 5];
2135 new_fops
= fops_get(handler
->fops
);
2137 mutex_unlock(&input_mutex
);
2140 * That's _really_ odd. Usually NULL ->open means "nothing special",
2141 * not "no device". Oh, well...
2143 if (!new_fops
|| !new_fops
->open
) {
2149 old_fops
= file
->f_op
;
2150 file
->f_op
= new_fops
;
2152 err
= new_fops
->open(inode
, file
);
2154 fops_put(file
->f_op
);
2155 file
->f_op
= fops_get(old_fops
);
2162 static const struct file_operations input_fops
= {
2163 .owner
= THIS_MODULE
,
2164 .open
= input_open_file
,
2165 .llseek
= noop_llseek
,
2168 static int __init
input_init(void)
2172 err
= class_register(&input_class
);
2174 printk(KERN_ERR
"input: unable to register input_dev class\n");
2178 err
= input_proc_init();
2182 err
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
2184 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
2190 fail2
: input_proc_exit();
2191 fail1
: class_unregister(&input_class
);
2195 static void __exit
input_exit(void)
2198 unregister_chrdev(INPUT_MAJOR
, "input");
2199 class_unregister(&input_class
);
2202 subsys_initcall(input_init
);
2203 module_exit(input_exit
);