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/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/sched.h>
21 #include <linux/seq_file.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25 #include <linux/rcupdate.h>
26 #include <linux/smp_lock.h>
28 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
29 MODULE_DESCRIPTION("Input core");
30 MODULE_LICENSE("GPL");
32 #define INPUT_DEVICES 256
35 * EV_ABS events which should not be cached are listed here.
37 static unsigned int input_abs_bypass_init_data
[] __initdata
= {
50 static unsigned long input_abs_bypass
[BITS_TO_LONGS(ABS_CNT
)];
52 static LIST_HEAD(input_dev_list
);
53 static LIST_HEAD(input_handler_list
);
56 * input_mutex protects access to both input_dev_list and input_handler_list.
57 * This also causes input_[un]register_device and input_[un]register_handler
58 * be mutually exclusive which simplifies locking in drivers implementing
61 static DEFINE_MUTEX(input_mutex
);
63 static struct input_handler
*input_table
[8];
65 static inline int is_event_supported(unsigned int code
,
66 unsigned long *bm
, unsigned int max
)
68 return code
<= max
&& test_bit(code
, bm
);
71 static int input_defuzz_abs_event(int value
, int old_val
, int fuzz
)
74 if (value
> old_val
- fuzz
/ 2 && value
< old_val
+ fuzz
/ 2)
77 if (value
> old_val
- fuzz
&& value
< old_val
+ fuzz
)
78 return (old_val
* 3 + value
) / 4;
80 if (value
> old_val
- fuzz
* 2 && value
< old_val
+ fuzz
* 2)
81 return (old_val
+ value
) / 2;
88 * Pass event through all open handles. This function is called with
89 * dev->event_lock held and interrupts disabled.
91 static void input_pass_event(struct input_dev
*dev
,
92 unsigned int type
, unsigned int code
, int value
)
94 struct input_handle
*handle
;
98 handle
= rcu_dereference(dev
->grab
);
100 handle
->handler
->event(handle
, type
, code
, value
);
102 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
)
104 handle
->handler
->event(handle
,
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 void input_handle_event(struct input_dev
*dev
,
166 unsigned int type
, unsigned int code
, int value
)
168 int disposition
= INPUT_IGNORE_EVENT
;
175 disposition
= INPUT_PASS_TO_ALL
;
181 disposition
= INPUT_PASS_TO_HANDLERS
;
186 disposition
= INPUT_PASS_TO_HANDLERS
;
192 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
193 !!test_bit(code
, dev
->key
) != value
) {
196 __change_bit(code
, dev
->key
);
198 input_start_autorepeat(dev
, code
);
200 input_stop_autorepeat(dev
);
203 disposition
= INPUT_PASS_TO_HANDLERS
;
208 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
209 !!test_bit(code
, dev
->sw
) != value
) {
211 __change_bit(code
, dev
->sw
);
212 disposition
= INPUT_PASS_TO_HANDLERS
;
217 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
)) {
219 if (test_bit(code
, input_abs_bypass
)) {
220 disposition
= INPUT_PASS_TO_HANDLERS
;
224 value
= input_defuzz_abs_event(value
,
225 dev
->abs
[code
], dev
->absfuzz
[code
]);
227 if (dev
->abs
[code
] != value
) {
228 dev
->abs
[code
] = value
;
229 disposition
= INPUT_PASS_TO_HANDLERS
;
235 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
236 disposition
= INPUT_PASS_TO_HANDLERS
;
241 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
242 disposition
= INPUT_PASS_TO_ALL
;
247 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
248 !!test_bit(code
, dev
->led
) != value
) {
250 __change_bit(code
, dev
->led
);
251 disposition
= INPUT_PASS_TO_ALL
;
256 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
258 if (!!test_bit(code
, dev
->snd
) != !!value
)
259 __change_bit(code
, dev
->snd
);
260 disposition
= INPUT_PASS_TO_ALL
;
265 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
266 dev
->rep
[code
] = value
;
267 disposition
= INPUT_PASS_TO_ALL
;
273 disposition
= INPUT_PASS_TO_ALL
;
277 disposition
= INPUT_PASS_TO_ALL
;
281 if (disposition
!= INPUT_IGNORE_EVENT
&& type
!= EV_SYN
)
284 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
285 dev
->event(dev
, type
, code
, value
);
287 if (disposition
& INPUT_PASS_TO_HANDLERS
)
288 input_pass_event(dev
, type
, code
, value
);
292 * input_event() - report new input event
293 * @dev: device that generated the event
294 * @type: type of the event
296 * @value: value of the event
298 * This function should be used by drivers implementing various input
299 * devices to report input events. See also input_inject_event().
301 * NOTE: input_event() may be safely used right after input device was
302 * allocated with input_allocate_device(), even before it is registered
303 * with input_register_device(), but the event will not reach any of the
304 * input handlers. Such early invocation of input_event() may be used
305 * to 'seed' initial state of a switch or initial position of absolute
308 void input_event(struct input_dev
*dev
,
309 unsigned int type
, unsigned int code
, int value
)
313 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
315 spin_lock_irqsave(&dev
->event_lock
, flags
);
316 add_input_randomness(type
, code
, value
);
317 input_handle_event(dev
, type
, code
, value
);
318 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
321 EXPORT_SYMBOL(input_event
);
324 * input_inject_event() - send input event from input handler
325 * @handle: input handle to send event through
326 * @type: type of the event
328 * @value: value of the event
330 * Similar to input_event() but will ignore event if device is
331 * "grabbed" and handle injecting event is not the one that owns
334 void input_inject_event(struct input_handle
*handle
,
335 unsigned int type
, unsigned int code
, int value
)
337 struct input_dev
*dev
= handle
->dev
;
338 struct input_handle
*grab
;
341 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
342 spin_lock_irqsave(&dev
->event_lock
, flags
);
345 grab
= rcu_dereference(dev
->grab
);
346 if (!grab
|| grab
== handle
)
347 input_handle_event(dev
, type
, code
, value
);
350 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
353 EXPORT_SYMBOL(input_inject_event
);
356 * input_grab_device - grabs device for exclusive use
357 * @handle: input handle that wants to own the device
359 * When a device is grabbed by an input handle all events generated by
360 * the device are delivered only to this handle. Also events injected
361 * by other input handles are ignored while device is grabbed.
363 int input_grab_device(struct input_handle
*handle
)
365 struct input_dev
*dev
= handle
->dev
;
368 retval
= mutex_lock_interruptible(&dev
->mutex
);
377 rcu_assign_pointer(dev
->grab
, handle
);
381 mutex_unlock(&dev
->mutex
);
384 EXPORT_SYMBOL(input_grab_device
);
386 static void __input_release_device(struct input_handle
*handle
)
388 struct input_dev
*dev
= handle
->dev
;
390 if (dev
->grab
== handle
) {
391 rcu_assign_pointer(dev
->grab
, NULL
);
392 /* Make sure input_pass_event() notices that grab is gone */
395 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
396 if (handle
->open
&& handle
->handler
->start
)
397 handle
->handler
->start(handle
);
402 * input_release_device - release previously grabbed device
403 * @handle: input handle that owns the device
405 * Releases previously grabbed device so that other input handles can
406 * start receiving input events. Upon release all handlers attached
407 * to the device have their start() method called so they have a change
408 * to synchronize device state with the rest of the system.
410 void input_release_device(struct input_handle
*handle
)
412 struct input_dev
*dev
= handle
->dev
;
414 mutex_lock(&dev
->mutex
);
415 __input_release_device(handle
);
416 mutex_unlock(&dev
->mutex
);
418 EXPORT_SYMBOL(input_release_device
);
421 * input_open_device - open input device
422 * @handle: handle through which device is being accessed
424 * This function should be called by input handlers when they
425 * want to start receive events from given input device.
427 int input_open_device(struct input_handle
*handle
)
429 struct input_dev
*dev
= handle
->dev
;
432 retval
= mutex_lock_interruptible(&dev
->mutex
);
436 if (dev
->going_away
) {
443 if (!dev
->users
++ && dev
->open
)
444 retval
= dev
->open(dev
);
448 if (!--handle
->open
) {
450 * Make sure we are not delivering any more events
451 * through this handle
458 mutex_unlock(&dev
->mutex
);
461 EXPORT_SYMBOL(input_open_device
);
463 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
465 struct input_dev
*dev
= handle
->dev
;
468 retval
= mutex_lock_interruptible(&dev
->mutex
);
473 retval
= dev
->flush(dev
, file
);
475 mutex_unlock(&dev
->mutex
);
478 EXPORT_SYMBOL(input_flush_device
);
481 * input_close_device - close input device
482 * @handle: handle through which device is being accessed
484 * This function should be called by input handlers when they
485 * want to stop receive events from given input device.
487 void input_close_device(struct input_handle
*handle
)
489 struct input_dev
*dev
= handle
->dev
;
491 mutex_lock(&dev
->mutex
);
493 __input_release_device(handle
);
495 if (!--dev
->users
&& dev
->close
)
498 if (!--handle
->open
) {
500 * synchronize_rcu() makes sure that input_pass_event()
501 * completed and that no more input events are delivered
502 * through this handle
507 mutex_unlock(&dev
->mutex
);
509 EXPORT_SYMBOL(input_close_device
);
512 * Prepare device for unregistering
514 static void input_disconnect_device(struct input_dev
*dev
)
516 struct input_handle
*handle
;
520 * Mark device as going away. Note that we take dev->mutex here
521 * not to protect access to dev->going_away but rather to ensure
522 * that there are no threads in the middle of input_open_device()
524 mutex_lock(&dev
->mutex
);
525 dev
->going_away
= true;
526 mutex_unlock(&dev
->mutex
);
528 spin_lock_irq(&dev
->event_lock
);
531 * Simulate keyup events for all pressed keys so that handlers
532 * are not left with "stuck" keys. The driver may continue
533 * generate events even after we done here but they will not
534 * reach any handlers.
536 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
537 for (code
= 0; code
<= KEY_MAX
; code
++) {
538 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
539 __test_and_clear_bit(code
, dev
->key
)) {
540 input_pass_event(dev
, EV_KEY
, code
, 0);
543 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
546 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
549 spin_unlock_irq(&dev
->event_lock
);
552 static int input_fetch_keycode(struct input_dev
*dev
, int scancode
)
554 switch (dev
->keycodesize
) {
556 return ((u8
*)dev
->keycode
)[scancode
];
559 return ((u16
*)dev
->keycode
)[scancode
];
562 return ((u32
*)dev
->keycode
)[scancode
];
566 static int input_default_getkeycode(struct input_dev
*dev
,
567 int scancode
, int *keycode
)
569 if (!dev
->keycodesize
)
572 if (scancode
>= dev
->keycodemax
)
575 *keycode
= input_fetch_keycode(dev
, scancode
);
580 static int input_default_setkeycode(struct input_dev
*dev
,
581 int scancode
, int keycode
)
586 if (scancode
>= dev
->keycodemax
)
589 if (!dev
->keycodesize
)
592 if (dev
->keycodesize
< sizeof(keycode
) && (keycode
>> (dev
->keycodesize
* 8)))
595 switch (dev
->keycodesize
) {
597 u8
*k
= (u8
*)dev
->keycode
;
598 old_keycode
= k
[scancode
];
599 k
[scancode
] = keycode
;
603 u16
*k
= (u16
*)dev
->keycode
;
604 old_keycode
= k
[scancode
];
605 k
[scancode
] = keycode
;
609 u32
*k
= (u32
*)dev
->keycode
;
610 old_keycode
= k
[scancode
];
611 k
[scancode
] = keycode
;
616 clear_bit(old_keycode
, dev
->keybit
);
617 set_bit(keycode
, dev
->keybit
);
619 for (i
= 0; i
< dev
->keycodemax
; i
++) {
620 if (input_fetch_keycode(dev
, i
) == old_keycode
) {
621 set_bit(old_keycode
, dev
->keybit
);
622 break; /* Setting the bit twice is useless, so break */
630 * input_get_keycode - retrieve keycode currently mapped to a given scancode
631 * @dev: input device which keymap is being queried
632 * @scancode: scancode (or its equivalent for device in question) for which
636 * This function should be called by anyone interested in retrieving current
637 * keymap. Presently keyboard and evdev handlers use it.
639 int input_get_keycode(struct input_dev
*dev
, int scancode
, int *keycode
)
644 return dev
->getkeycode(dev
, scancode
, keycode
);
646 EXPORT_SYMBOL(input_get_keycode
);
649 * input_get_keycode - assign new keycode to a given scancode
650 * @dev: input device which keymap is being updated
651 * @scancode: scancode (or its equivalent for device in question)
652 * @keycode: new keycode to be assigned to the scancode
654 * This function should be called by anyone needing to update current
655 * keymap. Presently keyboard and evdev handlers use it.
657 int input_set_keycode(struct input_dev
*dev
, int scancode
, int keycode
)
666 if (keycode
< 0 || keycode
> KEY_MAX
)
669 spin_lock_irqsave(&dev
->event_lock
, flags
);
671 retval
= dev
->getkeycode(dev
, scancode
, &old_keycode
);
675 retval
= dev
->setkeycode(dev
, scancode
, keycode
);
680 * Simulate keyup event if keycode is not present
681 * in the keymap anymore
683 if (test_bit(EV_KEY
, dev
->evbit
) &&
684 !is_event_supported(old_keycode
, dev
->keybit
, KEY_MAX
) &&
685 __test_and_clear_bit(old_keycode
, dev
->key
)) {
687 input_pass_event(dev
, EV_KEY
, old_keycode
, 0);
689 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
693 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
697 EXPORT_SYMBOL(input_set_keycode
);
699 #define MATCH_BIT(bit, max) \
700 for (i = 0; i < BITS_TO_LONGS(max); i++) \
701 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
703 if (i != BITS_TO_LONGS(max)) \
706 static const struct input_device_id
*input_match_device(const struct input_device_id
*id
,
707 struct input_dev
*dev
)
711 for (; id
->flags
|| id
->driver_info
; id
++) {
713 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
714 if (id
->bustype
!= dev
->id
.bustype
)
717 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
718 if (id
->vendor
!= dev
->id
.vendor
)
721 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
722 if (id
->product
!= dev
->id
.product
)
725 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
726 if (id
->version
!= dev
->id
.version
)
729 MATCH_BIT(evbit
, EV_MAX
);
730 MATCH_BIT(keybit
, KEY_MAX
);
731 MATCH_BIT(relbit
, REL_MAX
);
732 MATCH_BIT(absbit
, ABS_MAX
);
733 MATCH_BIT(mscbit
, MSC_MAX
);
734 MATCH_BIT(ledbit
, LED_MAX
);
735 MATCH_BIT(sndbit
, SND_MAX
);
736 MATCH_BIT(ffbit
, FF_MAX
);
737 MATCH_BIT(swbit
, SW_MAX
);
745 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
747 const struct input_device_id
*id
;
750 if (handler
->blacklist
&& input_match_device(handler
->blacklist
, dev
))
753 id
= input_match_device(handler
->id_table
, dev
);
757 error
= handler
->connect(handler
, dev
, id
);
758 if (error
&& error
!= -ENODEV
)
760 "input: failed to attach handler %s to device %s, "
762 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
768 #ifdef CONFIG_PROC_FS
770 static struct proc_dir_entry
*proc_bus_input_dir
;
771 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
772 static int input_devices_state
;
774 static inline void input_wakeup_procfs_readers(void)
776 input_devices_state
++;
777 wake_up(&input_devices_poll_wait
);
780 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
782 poll_wait(file
, &input_devices_poll_wait
, wait
);
783 if (file
->f_version
!= input_devices_state
) {
784 file
->f_version
= input_devices_state
;
785 return POLLIN
| POLLRDNORM
;
791 union input_seq_state
{
799 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
801 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
804 /* We need to fit into seq->private pointer */
805 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
807 error
= mutex_lock_interruptible(&input_mutex
);
809 state
->mutex_acquired
= false;
810 return ERR_PTR(error
);
813 state
->mutex_acquired
= true;
815 return seq_list_start(&input_dev_list
, *pos
);
818 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
820 return seq_list_next(v
, &input_dev_list
, pos
);
823 static void input_seq_stop(struct seq_file
*seq
, void *v
)
825 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
827 if (state
->mutex_acquired
)
828 mutex_unlock(&input_mutex
);
831 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
832 unsigned long *bitmap
, int max
)
836 for (i
= BITS_TO_LONGS(max
) - 1; i
> 0; i
--)
840 seq_printf(seq
, "B: %s=", name
);
842 seq_printf(seq
, "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
846 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
848 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
849 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
850 struct input_handle
*handle
;
852 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
853 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
855 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
856 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
857 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
858 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
859 seq_printf(seq
, "H: Handlers=");
861 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
862 seq_printf(seq
, "%s ", handle
->name
);
865 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
866 if (test_bit(EV_KEY
, dev
->evbit
))
867 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
868 if (test_bit(EV_REL
, dev
->evbit
))
869 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
870 if (test_bit(EV_ABS
, dev
->evbit
))
871 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
872 if (test_bit(EV_MSC
, dev
->evbit
))
873 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
874 if (test_bit(EV_LED
, dev
->evbit
))
875 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
876 if (test_bit(EV_SND
, dev
->evbit
))
877 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
878 if (test_bit(EV_FF
, dev
->evbit
))
879 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
880 if (test_bit(EV_SW
, dev
->evbit
))
881 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
889 static const struct seq_operations input_devices_seq_ops
= {
890 .start
= input_devices_seq_start
,
891 .next
= input_devices_seq_next
,
892 .stop
= input_seq_stop
,
893 .show
= input_devices_seq_show
,
896 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
898 return seq_open(file
, &input_devices_seq_ops
);
901 static const struct file_operations input_devices_fileops
= {
902 .owner
= THIS_MODULE
,
903 .open
= input_proc_devices_open
,
904 .poll
= input_proc_devices_poll
,
907 .release
= seq_release
,
910 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
912 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
915 /* We need to fit into seq->private pointer */
916 BUILD_BUG_ON(sizeof(union input_seq_state
) != sizeof(seq
->private));
918 error
= mutex_lock_interruptible(&input_mutex
);
920 state
->mutex_acquired
= false;
921 return ERR_PTR(error
);
924 state
->mutex_acquired
= true;
927 return seq_list_start(&input_handler_list
, *pos
);
930 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
932 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
934 state
->pos
= *pos
+ 1;
935 return seq_list_next(v
, &input_handler_list
, pos
);
938 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
940 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
941 union input_seq_state
*state
= (union input_seq_state
*)&seq
->private;
943 seq_printf(seq
, "N: Number=%u Name=%s", state
->pos
, handler
->name
);
945 seq_printf(seq
, " Minor=%d", handler
->minor
);
951 static const struct seq_operations input_handlers_seq_ops
= {
952 .start
= input_handlers_seq_start
,
953 .next
= input_handlers_seq_next
,
954 .stop
= input_seq_stop
,
955 .show
= input_handlers_seq_show
,
958 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
960 return seq_open(file
, &input_handlers_seq_ops
);
963 static const struct file_operations input_handlers_fileops
= {
964 .owner
= THIS_MODULE
,
965 .open
= input_proc_handlers_open
,
968 .release
= seq_release
,
971 static int __init
input_proc_init(void)
973 struct proc_dir_entry
*entry
;
975 proc_bus_input_dir
= proc_mkdir("bus/input", NULL
);
976 if (!proc_bus_input_dir
)
979 entry
= proc_create("devices", 0, proc_bus_input_dir
,
980 &input_devices_fileops
);
984 entry
= proc_create("handlers", 0, proc_bus_input_dir
,
985 &input_handlers_fileops
);
991 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
992 fail1
: remove_proc_entry("bus/input", NULL
);
996 static void input_proc_exit(void)
998 remove_proc_entry("devices", proc_bus_input_dir
);
999 remove_proc_entry("handlers", proc_bus_input_dir
);
1000 remove_proc_entry("bus/input", NULL
);
1003 #else /* !CONFIG_PROC_FS */
1004 static inline void input_wakeup_procfs_readers(void) { }
1005 static inline int input_proc_init(void) { return 0; }
1006 static inline void input_proc_exit(void) { }
1009 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1010 static ssize_t input_dev_show_##name(struct device *dev, \
1011 struct device_attribute *attr, \
1014 struct input_dev *input_dev = to_input_dev(dev); \
1016 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1017 input_dev->name ? input_dev->name : ""); \
1019 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1021 INPUT_DEV_STRING_ATTR_SHOW(name
);
1022 INPUT_DEV_STRING_ATTR_SHOW(phys
);
1023 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
1025 static int input_print_modalias_bits(char *buf
, int size
,
1026 char name
, unsigned long *bm
,
1027 unsigned int min_bit
, unsigned int max_bit
)
1031 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
1032 for (i
= min_bit
; i
< max_bit
; i
++)
1033 if (bm
[BIT_WORD(i
)] & BIT_MASK(i
))
1034 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
1038 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
1043 len
= snprintf(buf
, max(size
, 0),
1044 "input:b%04Xv%04Xp%04Xe%04X-",
1045 id
->id
.bustype
, id
->id
.vendor
,
1046 id
->id
.product
, id
->id
.version
);
1048 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1049 'e', id
->evbit
, 0, EV_MAX
);
1050 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1051 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
1052 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1053 'r', id
->relbit
, 0, REL_MAX
);
1054 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1055 'a', id
->absbit
, 0, ABS_MAX
);
1056 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1057 'm', id
->mscbit
, 0, MSC_MAX
);
1058 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1059 'l', id
->ledbit
, 0, LED_MAX
);
1060 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1061 's', id
->sndbit
, 0, SND_MAX
);
1062 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1063 'f', id
->ffbit
, 0, FF_MAX
);
1064 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1065 'w', id
->swbit
, 0, SW_MAX
);
1068 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
1073 static ssize_t
input_dev_show_modalias(struct device
*dev
,
1074 struct device_attribute
*attr
,
1077 struct input_dev
*id
= to_input_dev(dev
);
1080 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
1082 return min_t(int, len
, PAGE_SIZE
);
1084 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
1086 static struct attribute
*input_dev_attrs
[] = {
1087 &dev_attr_name
.attr
,
1088 &dev_attr_phys
.attr
,
1089 &dev_attr_uniq
.attr
,
1090 &dev_attr_modalias
.attr
,
1094 static struct attribute_group input_dev_attr_group
= {
1095 .attrs
= input_dev_attrs
,
1098 #define INPUT_DEV_ID_ATTR(name) \
1099 static ssize_t input_dev_show_id_##name(struct device *dev, \
1100 struct device_attribute *attr, \
1103 struct input_dev *input_dev = to_input_dev(dev); \
1104 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1106 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1108 INPUT_DEV_ID_ATTR(bustype
);
1109 INPUT_DEV_ID_ATTR(vendor
);
1110 INPUT_DEV_ID_ATTR(product
);
1111 INPUT_DEV_ID_ATTR(version
);
1113 static struct attribute
*input_dev_id_attrs
[] = {
1114 &dev_attr_bustype
.attr
,
1115 &dev_attr_vendor
.attr
,
1116 &dev_attr_product
.attr
,
1117 &dev_attr_version
.attr
,
1121 static struct attribute_group input_dev_id_attr_group
= {
1123 .attrs
= input_dev_id_attrs
,
1126 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1127 int max
, int add_cr
)
1132 for (i
= BITS_TO_LONGS(max
) - 1; i
> 0; i
--)
1137 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
1138 "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
1141 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1146 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1147 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1148 struct device_attribute *attr, \
1151 struct input_dev *input_dev = to_input_dev(dev); \
1152 int len = input_print_bitmap(buf, PAGE_SIZE, \
1153 input_dev->bm##bit, ev##_MAX, 1); \
1154 return min_t(int, len, PAGE_SIZE); \
1156 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1158 INPUT_DEV_CAP_ATTR(EV
, ev
);
1159 INPUT_DEV_CAP_ATTR(KEY
, key
);
1160 INPUT_DEV_CAP_ATTR(REL
, rel
);
1161 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1162 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1163 INPUT_DEV_CAP_ATTR(LED
, led
);
1164 INPUT_DEV_CAP_ATTR(SND
, snd
);
1165 INPUT_DEV_CAP_ATTR(FF
, ff
);
1166 INPUT_DEV_CAP_ATTR(SW
, sw
);
1168 static struct attribute
*input_dev_caps_attrs
[] = {
1181 static struct attribute_group input_dev_caps_attr_group
= {
1182 .name
= "capabilities",
1183 .attrs
= input_dev_caps_attrs
,
1186 static const struct attribute_group
*input_dev_attr_groups
[] = {
1187 &input_dev_attr_group
,
1188 &input_dev_id_attr_group
,
1189 &input_dev_caps_attr_group
,
1193 static void input_dev_release(struct device
*device
)
1195 struct input_dev
*dev
= to_input_dev(device
);
1197 input_ff_destroy(dev
);
1200 module_put(THIS_MODULE
);
1204 * Input uevent interface - loading event handlers based on
1207 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1208 const char *name
, unsigned long *bitmap
, int max
)
1212 if (add_uevent_var(env
, "%s=", name
))
1215 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1216 sizeof(env
->buf
) - env
->buflen
,
1218 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1225 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1226 struct input_dev
*dev
)
1230 if (add_uevent_var(env
, "MODALIAS="))
1233 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1234 sizeof(env
->buf
) - env
->buflen
,
1236 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1243 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1245 int err = add_uevent_var(env, fmt, val); \
1250 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1252 int err = input_add_uevent_bm_var(env, name, bm, max); \
1257 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1259 int err = input_add_uevent_modalias_var(env, dev); \
1264 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1266 struct input_dev
*dev
= to_input_dev(device
);
1268 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1269 dev
->id
.bustype
, dev
->id
.vendor
,
1270 dev
->id
.product
, dev
->id
.version
);
1272 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1274 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1276 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1278 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1279 if (test_bit(EV_KEY
, dev
->evbit
))
1280 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1281 if (test_bit(EV_REL
, dev
->evbit
))
1282 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1283 if (test_bit(EV_ABS
, dev
->evbit
))
1284 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1285 if (test_bit(EV_MSC
, dev
->evbit
))
1286 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1287 if (test_bit(EV_LED
, dev
->evbit
))
1288 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1289 if (test_bit(EV_SND
, dev
->evbit
))
1290 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1291 if (test_bit(EV_FF
, dev
->evbit
))
1292 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1293 if (test_bit(EV_SW
, dev
->evbit
))
1294 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1296 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1301 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1306 if (!test_bit(EV_##type, dev->evbit)) \
1309 for (i = 0; i < type##_MAX; i++) { \
1310 if (!test_bit(i, dev->bits##bit)) \
1313 active = test_bit(i, dev->bits); \
1314 if (!active && !on) \
1317 dev->event(dev, EV_##type, i, on ? active : 0); \
1322 static void input_dev_reset(struct input_dev
*dev
, bool activate
)
1327 INPUT_DO_TOGGLE(dev
, LED
, led
, activate
);
1328 INPUT_DO_TOGGLE(dev
, SND
, snd
, activate
);
1330 if (activate
&& test_bit(EV_REP
, dev
->evbit
)) {
1331 dev
->event(dev
, EV_REP
, REP_PERIOD
, dev
->rep
[REP_PERIOD
]);
1332 dev
->event(dev
, EV_REP
, REP_DELAY
, dev
->rep
[REP_DELAY
]);
1336 static int input_dev_suspend(struct device
*dev
)
1338 struct input_dev
*input_dev
= to_input_dev(dev
);
1340 mutex_lock(&input_dev
->mutex
);
1341 input_dev_reset(input_dev
, false);
1342 mutex_unlock(&input_dev
->mutex
);
1347 static int input_dev_resume(struct device
*dev
)
1349 struct input_dev
*input_dev
= to_input_dev(dev
);
1351 mutex_lock(&input_dev
->mutex
);
1352 input_dev_reset(input_dev
, true);
1353 mutex_unlock(&input_dev
->mutex
);
1358 static const struct dev_pm_ops input_dev_pm_ops
= {
1359 .suspend
= input_dev_suspend
,
1360 .resume
= input_dev_resume
,
1361 .poweroff
= input_dev_suspend
,
1362 .restore
= input_dev_resume
,
1364 #endif /* CONFIG_PM */
1366 static struct device_type input_dev_type
= {
1367 .groups
= input_dev_attr_groups
,
1368 .release
= input_dev_release
,
1369 .uevent
= input_dev_uevent
,
1371 .pm
= &input_dev_pm_ops
,
1375 static char *input_devnode(struct device
*dev
, mode_t
*mode
)
1377 return kasprintf(GFP_KERNEL
, "input/%s", dev_name(dev
));
1380 struct class input_class
= {
1382 .devnode
= input_devnode
,
1384 EXPORT_SYMBOL_GPL(input_class
);
1387 * input_allocate_device - allocate memory for new input device
1389 * Returns prepared struct input_dev or NULL.
1391 * NOTE: Use input_free_device() to free devices that have not been
1392 * registered; input_unregister_device() should be used for already
1393 * registered devices.
1395 struct input_dev
*input_allocate_device(void)
1397 struct input_dev
*dev
;
1399 dev
= kzalloc(sizeof(struct input_dev
), GFP_KERNEL
);
1401 dev
->dev
.type
= &input_dev_type
;
1402 dev
->dev
.class = &input_class
;
1403 device_initialize(&dev
->dev
);
1404 mutex_init(&dev
->mutex
);
1405 spin_lock_init(&dev
->event_lock
);
1406 INIT_LIST_HEAD(&dev
->h_list
);
1407 INIT_LIST_HEAD(&dev
->node
);
1409 __module_get(THIS_MODULE
);
1414 EXPORT_SYMBOL(input_allocate_device
);
1417 * input_free_device - free memory occupied by input_dev structure
1418 * @dev: input device to free
1420 * This function should only be used if input_register_device()
1421 * was not called yet or if it failed. Once device was registered
1422 * use input_unregister_device() and memory will be freed once last
1423 * reference to the device is dropped.
1425 * Device should be allocated by input_allocate_device().
1427 * NOTE: If there are references to the input device then memory
1428 * will not be freed until last reference is dropped.
1430 void input_free_device(struct input_dev
*dev
)
1433 input_put_device(dev
);
1435 EXPORT_SYMBOL(input_free_device
);
1438 * input_set_capability - mark device as capable of a certain event
1439 * @dev: device that is capable of emitting or accepting event
1440 * @type: type of the event (EV_KEY, EV_REL, etc...)
1443 * In addition to setting up corresponding bit in appropriate capability
1444 * bitmap the function also adjusts dev->evbit.
1446 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1450 __set_bit(code
, dev
->keybit
);
1454 __set_bit(code
, dev
->relbit
);
1458 __set_bit(code
, dev
->absbit
);
1462 __set_bit(code
, dev
->mscbit
);
1466 __set_bit(code
, dev
->swbit
);
1470 __set_bit(code
, dev
->ledbit
);
1474 __set_bit(code
, dev
->sndbit
);
1478 __set_bit(code
, dev
->ffbit
);
1487 "input_set_capability: unknown type %u (code %u)\n",
1493 __set_bit(type
, dev
->evbit
);
1495 EXPORT_SYMBOL(input_set_capability
);
1498 * input_register_device - register device with input core
1499 * @dev: device to be registered
1501 * This function registers device with input core. The device must be
1502 * allocated with input_allocate_device() and all it's capabilities
1503 * set up before registering.
1504 * If function fails the device must be freed with input_free_device().
1505 * Once device has been successfully registered it can be unregistered
1506 * with input_unregister_device(); input_free_device() should not be
1507 * called in this case.
1509 int input_register_device(struct input_dev
*dev
)
1511 static atomic_t input_no
= ATOMIC_INIT(0);
1512 struct input_handler
*handler
;
1516 __set_bit(EV_SYN
, dev
->evbit
);
1519 * If delay and period are pre-set by the driver, then autorepeating
1520 * is handled by the driver itself and we don't do it in input.c.
1523 init_timer(&dev
->timer
);
1524 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
1525 dev
->timer
.data
= (long) dev
;
1526 dev
->timer
.function
= input_repeat_key
;
1527 dev
->rep
[REP_DELAY
] = 250;
1528 dev
->rep
[REP_PERIOD
] = 33;
1531 if (!dev
->getkeycode
)
1532 dev
->getkeycode
= input_default_getkeycode
;
1534 if (!dev
->setkeycode
)
1535 dev
->setkeycode
= input_default_setkeycode
;
1537 dev_set_name(&dev
->dev
, "input%ld",
1538 (unsigned long) atomic_inc_return(&input_no
) - 1);
1540 error
= device_add(&dev
->dev
);
1544 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1545 printk(KERN_INFO
"input: %s as %s\n",
1546 dev
->name
? dev
->name
: "Unspecified device", path
? path
: "N/A");
1549 error
= mutex_lock_interruptible(&input_mutex
);
1551 device_del(&dev
->dev
);
1555 list_add_tail(&dev
->node
, &input_dev_list
);
1557 list_for_each_entry(handler
, &input_handler_list
, node
)
1558 input_attach_handler(dev
, handler
);
1560 input_wakeup_procfs_readers();
1562 mutex_unlock(&input_mutex
);
1566 EXPORT_SYMBOL(input_register_device
);
1569 * input_unregister_device - unregister previously registered device
1570 * @dev: device to be unregistered
1572 * This function unregisters an input device. Once device is unregistered
1573 * the caller should not try to access it as it may get freed at any moment.
1575 void input_unregister_device(struct input_dev
*dev
)
1577 struct input_handle
*handle
, *next
;
1579 input_disconnect_device(dev
);
1581 mutex_lock(&input_mutex
);
1583 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1584 handle
->handler
->disconnect(handle
);
1585 WARN_ON(!list_empty(&dev
->h_list
));
1587 del_timer_sync(&dev
->timer
);
1588 list_del_init(&dev
->node
);
1590 input_wakeup_procfs_readers();
1592 mutex_unlock(&input_mutex
);
1594 device_unregister(&dev
->dev
);
1596 EXPORT_SYMBOL(input_unregister_device
);
1599 * input_register_handler - register a new input handler
1600 * @handler: handler to be registered
1602 * This function registers a new input handler (interface) for input
1603 * devices in the system and attaches it to all input devices that
1604 * are compatible with the handler.
1606 int input_register_handler(struct input_handler
*handler
)
1608 struct input_dev
*dev
;
1611 retval
= mutex_lock_interruptible(&input_mutex
);
1615 INIT_LIST_HEAD(&handler
->h_list
);
1617 if (handler
->fops
!= NULL
) {
1618 if (input_table
[handler
->minor
>> 5]) {
1622 input_table
[handler
->minor
>> 5] = handler
;
1625 list_add_tail(&handler
->node
, &input_handler_list
);
1627 list_for_each_entry(dev
, &input_dev_list
, node
)
1628 input_attach_handler(dev
, handler
);
1630 input_wakeup_procfs_readers();
1633 mutex_unlock(&input_mutex
);
1636 EXPORT_SYMBOL(input_register_handler
);
1639 * input_unregister_handler - unregisters an input handler
1640 * @handler: handler to be unregistered
1642 * This function disconnects a handler from its input devices and
1643 * removes it from lists of known handlers.
1645 void input_unregister_handler(struct input_handler
*handler
)
1647 struct input_handle
*handle
, *next
;
1649 mutex_lock(&input_mutex
);
1651 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
1652 handler
->disconnect(handle
);
1653 WARN_ON(!list_empty(&handler
->h_list
));
1655 list_del_init(&handler
->node
);
1657 if (handler
->fops
!= NULL
)
1658 input_table
[handler
->minor
>> 5] = NULL
;
1660 input_wakeup_procfs_readers();
1662 mutex_unlock(&input_mutex
);
1664 EXPORT_SYMBOL(input_unregister_handler
);
1667 * input_handler_for_each_handle - handle iterator
1668 * @handler: input handler to iterate
1669 * @data: data for the callback
1670 * @fn: function to be called for each handle
1672 * Iterate over @bus's list of devices, and call @fn for each, passing
1673 * it @data and stop when @fn returns a non-zero value. The function is
1674 * using RCU to traverse the list and therefore may be usind in atonic
1675 * contexts. The @fn callback is invoked from RCU critical section and
1676 * thus must not sleep.
1678 int input_handler_for_each_handle(struct input_handler
*handler
, void *data
,
1679 int (*fn
)(struct input_handle
*, void *))
1681 struct input_handle
*handle
;
1686 list_for_each_entry_rcu(handle
, &handler
->h_list
, h_node
) {
1687 retval
= fn(handle
, data
);
1696 EXPORT_SYMBOL(input_handler_for_each_handle
);
1699 * input_register_handle - register a new input handle
1700 * @handle: handle to register
1702 * This function puts a new input handle onto device's
1703 * and handler's lists so that events can flow through
1704 * it once it is opened using input_open_device().
1706 * This function is supposed to be called from handler's
1709 int input_register_handle(struct input_handle
*handle
)
1711 struct input_handler
*handler
= handle
->handler
;
1712 struct input_dev
*dev
= handle
->dev
;
1716 * We take dev->mutex here to prevent race with
1717 * input_release_device().
1719 error
= mutex_lock_interruptible(&dev
->mutex
);
1722 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
1723 mutex_unlock(&dev
->mutex
);
1726 * Since we are supposed to be called from ->connect()
1727 * which is mutually exclusive with ->disconnect()
1728 * we can't be racing with input_unregister_handle()
1729 * and so separate lock is not needed here.
1731 list_add_tail_rcu(&handle
->h_node
, &handler
->h_list
);
1734 handler
->start(handle
);
1738 EXPORT_SYMBOL(input_register_handle
);
1741 * input_unregister_handle - unregister an input handle
1742 * @handle: handle to unregister
1744 * This function removes input handle from device's
1745 * and handler's lists.
1747 * This function is supposed to be called from handler's
1748 * disconnect() method.
1750 void input_unregister_handle(struct input_handle
*handle
)
1752 struct input_dev
*dev
= handle
->dev
;
1754 list_del_rcu(&handle
->h_node
);
1757 * Take dev->mutex to prevent race with input_release_device().
1759 mutex_lock(&dev
->mutex
);
1760 list_del_rcu(&handle
->d_node
);
1761 mutex_unlock(&dev
->mutex
);
1765 EXPORT_SYMBOL(input_unregister_handle
);
1767 static int input_open_file(struct inode
*inode
, struct file
*file
)
1769 struct input_handler
*handler
;
1770 const struct file_operations
*old_fops
, *new_fops
= NULL
;
1774 /* No load-on-demand here? */
1775 handler
= input_table
[iminor(inode
) >> 5];
1776 if (!handler
|| !(new_fops
= fops_get(handler
->fops
))) {
1782 * That's _really_ odd. Usually NULL ->open means "nothing special",
1783 * not "no device". Oh, well...
1785 if (!new_fops
->open
) {
1790 old_fops
= file
->f_op
;
1791 file
->f_op
= new_fops
;
1793 err
= new_fops
->open(inode
, file
);
1796 fops_put(file
->f_op
);
1797 file
->f_op
= fops_get(old_fops
);
1805 static const struct file_operations input_fops
= {
1806 .owner
= THIS_MODULE
,
1807 .open
= input_open_file
,
1810 static void __init
input_init_abs_bypass(void)
1812 const unsigned int *p
;
1814 for (p
= input_abs_bypass_init_data
; *p
; p
++)
1815 input_abs_bypass
[BIT_WORD(*p
)] |= BIT_MASK(*p
);
1818 static int __init
input_init(void)
1822 input_init_abs_bypass();
1824 err
= class_register(&input_class
);
1826 printk(KERN_ERR
"input: unable to register input_dev class\n");
1830 err
= input_proc_init();
1834 err
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
1836 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
1842 fail2
: input_proc_exit();
1843 fail1
: class_unregister(&input_class
);
1847 static void __exit
input_exit(void)
1850 unregister_chrdev(INPUT_MAJOR
, "input");
1851 class_unregister(&input_class
);
1854 subsys_initcall(input_init
);
1855 module_exit(input_exit
);