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/input.h>
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/major.h>
18 #include <linux/proc_fs.h>
19 #include <linux/seq_file.h>
20 #include <linux/poll.h>
21 #include <linux/device.h>
22 #include <linux/mutex.h>
23 #include <linux/rcupdate.h>
24 #include <linux/smp_lock.h>
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
30 #define INPUT_DEVICES 256
33 * EV_ABS events which should not be cached are listed here.
35 static unsigned int input_abs_bypass_init_data
[] __initdata
= {
47 static unsigned long input_abs_bypass
[BITS_TO_LONGS(ABS_CNT
)];
49 static LIST_HEAD(input_dev_list
);
50 static LIST_HEAD(input_handler_list
);
53 * input_mutex protects access to both input_dev_list and input_handler_list.
54 * This also causes input_[un]register_device and input_[un]register_handler
55 * be mutually exclusive which simplifies locking in drivers implementing
58 static DEFINE_MUTEX(input_mutex
);
60 static struct input_handler
*input_table
[8];
62 static inline int is_event_supported(unsigned int code
,
63 unsigned long *bm
, unsigned int max
)
65 return code
<= max
&& test_bit(code
, bm
);
68 static int input_defuzz_abs_event(int value
, int old_val
, int fuzz
)
71 if (value
> old_val
- fuzz
/ 2 && value
< old_val
+ fuzz
/ 2)
74 if (value
> old_val
- fuzz
&& value
< old_val
+ fuzz
)
75 return (old_val
* 3 + value
) / 4;
77 if (value
> old_val
- fuzz
* 2 && value
< old_val
+ fuzz
* 2)
78 return (old_val
+ value
) / 2;
85 * Pass event through all open handles. This function is called with
86 * dev->event_lock held and interrupts disabled.
88 static void input_pass_event(struct input_dev
*dev
,
89 unsigned int type
, unsigned int code
, int value
)
91 struct input_handle
*handle
;
95 handle
= rcu_dereference(dev
->grab
);
97 handle
->handler
->event(handle
, type
, code
, value
);
99 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
)
101 handle
->handler
->event(handle
,
107 * Generate software autorepeat event. Note that we take
108 * dev->event_lock here to avoid racing with input_event
109 * which may cause keys get "stuck".
111 static void input_repeat_key(unsigned long data
)
113 struct input_dev
*dev
= (void *) data
;
116 spin_lock_irqsave(&dev
->event_lock
, flags
);
118 if (test_bit(dev
->repeat_key
, dev
->key
) &&
119 is_event_supported(dev
->repeat_key
, dev
->keybit
, KEY_MAX
)) {
121 input_pass_event(dev
, EV_KEY
, dev
->repeat_key
, 2);
125 * Only send SYN_REPORT if we are not in a middle
126 * of driver parsing a new hardware packet.
127 * Otherwise assume that the driver will send
128 * SYN_REPORT once it's done.
130 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
133 if (dev
->rep
[REP_PERIOD
])
134 mod_timer(&dev
->timer
, jiffies
+
135 msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
138 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
141 static void input_start_autorepeat(struct input_dev
*dev
, int code
)
143 if (test_bit(EV_REP
, dev
->evbit
) &&
144 dev
->rep
[REP_PERIOD
] && dev
->rep
[REP_DELAY
] &&
146 dev
->repeat_key
= code
;
147 mod_timer(&dev
->timer
,
148 jiffies
+ msecs_to_jiffies(dev
->rep
[REP_DELAY
]));
152 static void input_stop_autorepeat(struct input_dev
*dev
)
154 del_timer(&dev
->timer
);
157 #define INPUT_IGNORE_EVENT 0
158 #define INPUT_PASS_TO_HANDLERS 1
159 #define INPUT_PASS_TO_DEVICE 2
160 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
162 static void input_handle_event(struct input_dev
*dev
,
163 unsigned int type
, unsigned int code
, int value
)
165 int disposition
= INPUT_IGNORE_EVENT
;
172 disposition
= INPUT_PASS_TO_ALL
;
178 disposition
= INPUT_PASS_TO_HANDLERS
;
183 disposition
= INPUT_PASS_TO_HANDLERS
;
189 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
190 !!test_bit(code
, dev
->key
) != value
) {
193 __change_bit(code
, dev
->key
);
195 input_start_autorepeat(dev
, code
);
197 input_stop_autorepeat(dev
);
200 disposition
= INPUT_PASS_TO_HANDLERS
;
205 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
206 !!test_bit(code
, dev
->sw
) != value
) {
208 __change_bit(code
, dev
->sw
);
209 disposition
= INPUT_PASS_TO_HANDLERS
;
214 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
)) {
216 if (test_bit(code
, input_abs_bypass
)) {
217 disposition
= INPUT_PASS_TO_HANDLERS
;
221 value
= input_defuzz_abs_event(value
,
222 dev
->abs
[code
], dev
->absfuzz
[code
]);
224 if (dev
->abs
[code
] != value
) {
225 dev
->abs
[code
] = value
;
226 disposition
= INPUT_PASS_TO_HANDLERS
;
232 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
233 disposition
= INPUT_PASS_TO_HANDLERS
;
238 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
239 disposition
= INPUT_PASS_TO_ALL
;
244 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
245 !!test_bit(code
, dev
->led
) != value
) {
247 __change_bit(code
, dev
->led
);
248 disposition
= INPUT_PASS_TO_ALL
;
253 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
255 if (!!test_bit(code
, dev
->snd
) != !!value
)
256 __change_bit(code
, dev
->snd
);
257 disposition
= INPUT_PASS_TO_ALL
;
262 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
263 dev
->rep
[code
] = value
;
264 disposition
= INPUT_PASS_TO_ALL
;
270 disposition
= INPUT_PASS_TO_ALL
;
274 disposition
= INPUT_PASS_TO_ALL
;
278 if (disposition
!= INPUT_IGNORE_EVENT
&& type
!= EV_SYN
)
281 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
282 dev
->event(dev
, type
, code
, value
);
284 if (disposition
& INPUT_PASS_TO_HANDLERS
)
285 input_pass_event(dev
, type
, code
, value
);
289 * input_event() - report new input event
290 * @dev: device that generated the event
291 * @type: type of the event
293 * @value: value of the event
295 * This function should be used by drivers implementing various input
296 * devices. See also input_inject_event().
299 void input_event(struct input_dev
*dev
,
300 unsigned int type
, unsigned int code
, int value
)
304 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
306 spin_lock_irqsave(&dev
->event_lock
, flags
);
307 add_input_randomness(type
, code
, value
);
308 input_handle_event(dev
, type
, code
, value
);
309 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
312 EXPORT_SYMBOL(input_event
);
315 * input_inject_event() - send input event from input handler
316 * @handle: input handle to send event through
317 * @type: type of the event
319 * @value: value of the event
321 * Similar to input_event() but will ignore event if device is
322 * "grabbed" and handle injecting event is not the one that owns
325 void input_inject_event(struct input_handle
*handle
,
326 unsigned int type
, unsigned int code
, int value
)
328 struct input_dev
*dev
= handle
->dev
;
329 struct input_handle
*grab
;
332 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
333 spin_lock_irqsave(&dev
->event_lock
, flags
);
336 grab
= rcu_dereference(dev
->grab
);
337 if (!grab
|| grab
== handle
)
338 input_handle_event(dev
, type
, code
, value
);
341 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
344 EXPORT_SYMBOL(input_inject_event
);
347 * input_grab_device - grabs device for exclusive use
348 * @handle: input handle that wants to own the device
350 * When a device is grabbed by an input handle all events generated by
351 * the device are delivered only to this handle. Also events injected
352 * by other input handles are ignored while device is grabbed.
354 int input_grab_device(struct input_handle
*handle
)
356 struct input_dev
*dev
= handle
->dev
;
359 retval
= mutex_lock_interruptible(&dev
->mutex
);
368 rcu_assign_pointer(dev
->grab
, handle
);
372 mutex_unlock(&dev
->mutex
);
375 EXPORT_SYMBOL(input_grab_device
);
377 static void __input_release_device(struct input_handle
*handle
)
379 struct input_dev
*dev
= handle
->dev
;
381 if (dev
->grab
== handle
) {
382 rcu_assign_pointer(dev
->grab
, NULL
);
383 /* Make sure input_pass_event() notices that grab is gone */
386 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
387 if (handle
->open
&& handle
->handler
->start
)
388 handle
->handler
->start(handle
);
393 * input_release_device - release previously grabbed device
394 * @handle: input handle that owns the device
396 * Releases previously grabbed device so that other input handles can
397 * start receiving input events. Upon release all handlers attached
398 * to the device have their start() method called so they have a change
399 * to synchronize device state with the rest of the system.
401 void input_release_device(struct input_handle
*handle
)
403 struct input_dev
*dev
= handle
->dev
;
405 mutex_lock(&dev
->mutex
);
406 __input_release_device(handle
);
407 mutex_unlock(&dev
->mutex
);
409 EXPORT_SYMBOL(input_release_device
);
412 * input_open_device - open input device
413 * @handle: handle through which device is being accessed
415 * This function should be called by input handlers when they
416 * want to start receive events from given input device.
418 int input_open_device(struct input_handle
*handle
)
420 struct input_dev
*dev
= handle
->dev
;
423 retval
= mutex_lock_interruptible(&dev
->mutex
);
427 if (dev
->going_away
) {
434 if (!dev
->users
++ && dev
->open
)
435 retval
= dev
->open(dev
);
439 if (!--handle
->open
) {
441 * Make sure we are not delivering any more events
442 * through this handle
449 mutex_unlock(&dev
->mutex
);
452 EXPORT_SYMBOL(input_open_device
);
454 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
456 struct input_dev
*dev
= handle
->dev
;
459 retval
= mutex_lock_interruptible(&dev
->mutex
);
464 retval
= dev
->flush(dev
, file
);
466 mutex_unlock(&dev
->mutex
);
469 EXPORT_SYMBOL(input_flush_device
);
472 * input_close_device - close input device
473 * @handle: handle through which device is being accessed
475 * This function should be called by input handlers when they
476 * want to stop receive events from given input device.
478 void input_close_device(struct input_handle
*handle
)
480 struct input_dev
*dev
= handle
->dev
;
482 mutex_lock(&dev
->mutex
);
484 __input_release_device(handle
);
486 if (!--dev
->users
&& dev
->close
)
489 if (!--handle
->open
) {
491 * synchronize_rcu() makes sure that input_pass_event()
492 * completed and that no more input events are delivered
493 * through this handle
498 mutex_unlock(&dev
->mutex
);
500 EXPORT_SYMBOL(input_close_device
);
503 * Prepare device for unregistering
505 static void input_disconnect_device(struct input_dev
*dev
)
507 struct input_handle
*handle
;
511 * Mark device as going away. Note that we take dev->mutex here
512 * not to protect access to dev->going_away but rather to ensure
513 * that there are no threads in the middle of input_open_device()
515 mutex_lock(&dev
->mutex
);
517 mutex_unlock(&dev
->mutex
);
519 spin_lock_irq(&dev
->event_lock
);
522 * Simulate keyup events for all pressed keys so that handlers
523 * are not left with "stuck" keys. The driver may continue
524 * generate events even after we done here but they will not
525 * reach any handlers.
527 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
528 for (code
= 0; code
<= KEY_MAX
; code
++) {
529 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
530 __test_and_clear_bit(code
, dev
->key
)) {
531 input_pass_event(dev
, EV_KEY
, code
, 0);
534 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
537 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
540 spin_unlock_irq(&dev
->event_lock
);
543 static int input_fetch_keycode(struct input_dev
*dev
, int scancode
)
545 switch (dev
->keycodesize
) {
547 return ((u8
*)dev
->keycode
)[scancode
];
550 return ((u16
*)dev
->keycode
)[scancode
];
553 return ((u32
*)dev
->keycode
)[scancode
];
557 static int input_default_getkeycode(struct input_dev
*dev
,
558 int scancode
, int *keycode
)
560 if (!dev
->keycodesize
)
563 if (scancode
>= dev
->keycodemax
)
566 *keycode
= input_fetch_keycode(dev
, scancode
);
571 static int input_default_setkeycode(struct input_dev
*dev
,
572 int scancode
, int keycode
)
577 if (scancode
>= dev
->keycodemax
)
580 if (!dev
->keycodesize
)
583 if (dev
->keycodesize
< sizeof(keycode
) && (keycode
>> (dev
->keycodesize
* 8)))
586 switch (dev
->keycodesize
) {
588 u8
*k
= (u8
*)dev
->keycode
;
589 old_keycode
= k
[scancode
];
590 k
[scancode
] = keycode
;
594 u16
*k
= (u16
*)dev
->keycode
;
595 old_keycode
= k
[scancode
];
596 k
[scancode
] = keycode
;
600 u32
*k
= (u32
*)dev
->keycode
;
601 old_keycode
= k
[scancode
];
602 k
[scancode
] = keycode
;
607 clear_bit(old_keycode
, dev
->keybit
);
608 set_bit(keycode
, dev
->keybit
);
610 for (i
= 0; i
< dev
->keycodemax
; i
++) {
611 if (input_fetch_keycode(dev
, i
) == old_keycode
) {
612 set_bit(old_keycode
, dev
->keybit
);
613 break; /* Setting the bit twice is useless, so break */
621 * input_get_keycode - retrieve keycode currently mapped to a given scancode
622 * @dev: input device which keymap is being queried
623 * @scancode: scancode (or its equivalent for device in question) for which
627 * This function should be called by anyone interested in retrieving current
628 * keymap. Presently keyboard and evdev handlers use it.
630 int input_get_keycode(struct input_dev
*dev
, int scancode
, int *keycode
)
635 return dev
->getkeycode(dev
, scancode
, keycode
);
637 EXPORT_SYMBOL(input_get_keycode
);
640 * input_get_keycode - assign new keycode to a given scancode
641 * @dev: input device which keymap is being updated
642 * @scancode: scancode (or its equivalent for device in question)
643 * @keycode: new keycode to be assigned to the scancode
645 * This function should be called by anyone needing to update current
646 * keymap. Presently keyboard and evdev handlers use it.
648 int input_set_keycode(struct input_dev
*dev
, int scancode
, int keycode
)
657 if (keycode
< 0 || keycode
> KEY_MAX
)
660 spin_lock_irqsave(&dev
->event_lock
, flags
);
662 retval
= dev
->getkeycode(dev
, scancode
, &old_keycode
);
666 retval
= dev
->setkeycode(dev
, scancode
, keycode
);
671 * Simulate keyup event if keycode is not present
672 * in the keymap anymore
674 if (test_bit(EV_KEY
, dev
->evbit
) &&
675 !is_event_supported(old_keycode
, dev
->keybit
, KEY_MAX
) &&
676 __test_and_clear_bit(old_keycode
, dev
->key
)) {
678 input_pass_event(dev
, EV_KEY
, old_keycode
, 0);
680 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
684 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
688 EXPORT_SYMBOL(input_set_keycode
);
690 #define MATCH_BIT(bit, max) \
691 for (i = 0; i < BITS_TO_LONGS(max); i++) \
692 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
694 if (i != BITS_TO_LONGS(max)) \
697 static const struct input_device_id
*input_match_device(const struct input_device_id
*id
,
698 struct input_dev
*dev
)
702 for (; id
->flags
|| id
->driver_info
; id
++) {
704 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
705 if (id
->bustype
!= dev
->id
.bustype
)
708 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
709 if (id
->vendor
!= dev
->id
.vendor
)
712 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
713 if (id
->product
!= dev
->id
.product
)
716 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
717 if (id
->version
!= dev
->id
.version
)
720 MATCH_BIT(evbit
, EV_MAX
);
721 MATCH_BIT(keybit
, KEY_MAX
);
722 MATCH_BIT(relbit
, REL_MAX
);
723 MATCH_BIT(absbit
, ABS_MAX
);
724 MATCH_BIT(mscbit
, MSC_MAX
);
725 MATCH_BIT(ledbit
, LED_MAX
);
726 MATCH_BIT(sndbit
, SND_MAX
);
727 MATCH_BIT(ffbit
, FF_MAX
);
728 MATCH_BIT(swbit
, SW_MAX
);
736 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
738 const struct input_device_id
*id
;
741 if (handler
->blacklist
&& input_match_device(handler
->blacklist
, dev
))
744 id
= input_match_device(handler
->id_table
, dev
);
748 error
= handler
->connect(handler
, dev
, id
);
749 if (error
&& error
!= -ENODEV
)
751 "input: failed to attach handler %s to device %s, "
753 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
759 #ifdef CONFIG_PROC_FS
761 static struct proc_dir_entry
*proc_bus_input_dir
;
762 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
763 static int input_devices_state
;
765 static inline void input_wakeup_procfs_readers(void)
767 input_devices_state
++;
768 wake_up(&input_devices_poll_wait
);
771 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
773 poll_wait(file
, &input_devices_poll_wait
, wait
);
774 if (file
->f_version
!= input_devices_state
) {
775 file
->f_version
= input_devices_state
;
776 return POLLIN
| POLLRDNORM
;
782 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
784 if (mutex_lock_interruptible(&input_mutex
))
787 return seq_list_start(&input_dev_list
, *pos
);
790 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
792 return seq_list_next(v
, &input_dev_list
, pos
);
795 static void input_devices_seq_stop(struct seq_file
*seq
, void *v
)
797 mutex_unlock(&input_mutex
);
800 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
801 unsigned long *bitmap
, int max
)
805 for (i
= BITS_TO_LONGS(max
) - 1; i
> 0; i
--)
809 seq_printf(seq
, "B: %s=", name
);
811 seq_printf(seq
, "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
815 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
817 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
818 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
819 struct input_handle
*handle
;
821 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
822 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
824 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
825 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
826 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
827 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
828 seq_printf(seq
, "H: Handlers=");
830 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
831 seq_printf(seq
, "%s ", handle
->name
);
834 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
835 if (test_bit(EV_KEY
, dev
->evbit
))
836 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
837 if (test_bit(EV_REL
, dev
->evbit
))
838 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
839 if (test_bit(EV_ABS
, dev
->evbit
))
840 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
841 if (test_bit(EV_MSC
, dev
->evbit
))
842 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
843 if (test_bit(EV_LED
, dev
->evbit
))
844 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
845 if (test_bit(EV_SND
, dev
->evbit
))
846 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
847 if (test_bit(EV_FF
, dev
->evbit
))
848 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
849 if (test_bit(EV_SW
, dev
->evbit
))
850 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
858 static const struct seq_operations input_devices_seq_ops
= {
859 .start
= input_devices_seq_start
,
860 .next
= input_devices_seq_next
,
861 .stop
= input_devices_seq_stop
,
862 .show
= input_devices_seq_show
,
865 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
867 return seq_open(file
, &input_devices_seq_ops
);
870 static const struct file_operations input_devices_fileops
= {
871 .owner
= THIS_MODULE
,
872 .open
= input_proc_devices_open
,
873 .poll
= input_proc_devices_poll
,
876 .release
= seq_release
,
879 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
881 if (mutex_lock_interruptible(&input_mutex
))
884 seq
->private = (void *)(unsigned long)*pos
;
885 return seq_list_start(&input_handler_list
, *pos
);
888 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
890 seq
->private = (void *)(unsigned long)(*pos
+ 1);
891 return seq_list_next(v
, &input_handler_list
, pos
);
894 static void input_handlers_seq_stop(struct seq_file
*seq
, void *v
)
896 mutex_unlock(&input_mutex
);
899 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
901 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
903 seq_printf(seq
, "N: Number=%ld Name=%s",
904 (unsigned long)seq
->private, handler
->name
);
906 seq_printf(seq
, " Minor=%d", handler
->minor
);
911 static const struct seq_operations input_handlers_seq_ops
= {
912 .start
= input_handlers_seq_start
,
913 .next
= input_handlers_seq_next
,
914 .stop
= input_handlers_seq_stop
,
915 .show
= input_handlers_seq_show
,
918 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
920 return seq_open(file
, &input_handlers_seq_ops
);
923 static const struct file_operations input_handlers_fileops
= {
924 .owner
= THIS_MODULE
,
925 .open
= input_proc_handlers_open
,
928 .release
= seq_release
,
931 static int __init
input_proc_init(void)
933 struct proc_dir_entry
*entry
;
935 proc_bus_input_dir
= proc_mkdir("bus/input", NULL
);
936 if (!proc_bus_input_dir
)
939 entry
= proc_create("devices", 0, proc_bus_input_dir
,
940 &input_devices_fileops
);
944 entry
= proc_create("handlers", 0, proc_bus_input_dir
,
945 &input_handlers_fileops
);
951 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
952 fail1
: remove_proc_entry("bus/input", NULL
);
956 static void input_proc_exit(void)
958 remove_proc_entry("devices", proc_bus_input_dir
);
959 remove_proc_entry("handlers", proc_bus_input_dir
);
960 remove_proc_entry("bus/input", NULL
);
963 #else /* !CONFIG_PROC_FS */
964 static inline void input_wakeup_procfs_readers(void) { }
965 static inline int input_proc_init(void) { return 0; }
966 static inline void input_proc_exit(void) { }
969 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
970 static ssize_t input_dev_show_##name(struct device *dev, \
971 struct device_attribute *attr, \
974 struct input_dev *input_dev = to_input_dev(dev); \
976 return scnprintf(buf, PAGE_SIZE, "%s\n", \
977 input_dev->name ? input_dev->name : ""); \
979 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
981 INPUT_DEV_STRING_ATTR_SHOW(name
);
982 INPUT_DEV_STRING_ATTR_SHOW(phys
);
983 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
985 static int input_print_modalias_bits(char *buf
, int size
,
986 char name
, unsigned long *bm
,
987 unsigned int min_bit
, unsigned int max_bit
)
991 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
992 for (i
= min_bit
; i
< max_bit
; i
++)
993 if (bm
[BIT_WORD(i
)] & BIT_MASK(i
))
994 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
998 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
1003 len
= snprintf(buf
, max(size
, 0),
1004 "input:b%04Xv%04Xp%04Xe%04X-",
1005 id
->id
.bustype
, id
->id
.vendor
,
1006 id
->id
.product
, id
->id
.version
);
1008 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1009 'e', id
->evbit
, 0, EV_MAX
);
1010 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1011 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
1012 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1013 'r', id
->relbit
, 0, REL_MAX
);
1014 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1015 'a', id
->absbit
, 0, ABS_MAX
);
1016 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1017 'm', id
->mscbit
, 0, MSC_MAX
);
1018 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1019 'l', id
->ledbit
, 0, LED_MAX
);
1020 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1021 's', id
->sndbit
, 0, SND_MAX
);
1022 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1023 'f', id
->ffbit
, 0, FF_MAX
);
1024 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
1025 'w', id
->swbit
, 0, SW_MAX
);
1028 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
1033 static ssize_t
input_dev_show_modalias(struct device
*dev
,
1034 struct device_attribute
*attr
,
1037 struct input_dev
*id
= to_input_dev(dev
);
1040 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
1042 return min_t(int, len
, PAGE_SIZE
);
1044 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
1046 static struct attribute
*input_dev_attrs
[] = {
1047 &dev_attr_name
.attr
,
1048 &dev_attr_phys
.attr
,
1049 &dev_attr_uniq
.attr
,
1050 &dev_attr_modalias
.attr
,
1054 static struct attribute_group input_dev_attr_group
= {
1055 .attrs
= input_dev_attrs
,
1058 #define INPUT_DEV_ID_ATTR(name) \
1059 static ssize_t input_dev_show_id_##name(struct device *dev, \
1060 struct device_attribute *attr, \
1063 struct input_dev *input_dev = to_input_dev(dev); \
1064 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1066 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1068 INPUT_DEV_ID_ATTR(bustype
);
1069 INPUT_DEV_ID_ATTR(vendor
);
1070 INPUT_DEV_ID_ATTR(product
);
1071 INPUT_DEV_ID_ATTR(version
);
1073 static struct attribute
*input_dev_id_attrs
[] = {
1074 &dev_attr_bustype
.attr
,
1075 &dev_attr_vendor
.attr
,
1076 &dev_attr_product
.attr
,
1077 &dev_attr_version
.attr
,
1081 static struct attribute_group input_dev_id_attr_group
= {
1083 .attrs
= input_dev_id_attrs
,
1086 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
1087 int max
, int add_cr
)
1092 for (i
= BITS_TO_LONGS(max
) - 1; i
> 0; i
--)
1097 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
1098 "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
1101 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1106 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1107 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1108 struct device_attribute *attr, \
1111 struct input_dev *input_dev = to_input_dev(dev); \
1112 int len = input_print_bitmap(buf, PAGE_SIZE, \
1113 input_dev->bm##bit, ev##_MAX, 1); \
1114 return min_t(int, len, PAGE_SIZE); \
1116 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1118 INPUT_DEV_CAP_ATTR(EV
, ev
);
1119 INPUT_DEV_CAP_ATTR(KEY
, key
);
1120 INPUT_DEV_CAP_ATTR(REL
, rel
);
1121 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1122 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1123 INPUT_DEV_CAP_ATTR(LED
, led
);
1124 INPUT_DEV_CAP_ATTR(SND
, snd
);
1125 INPUT_DEV_CAP_ATTR(FF
, ff
);
1126 INPUT_DEV_CAP_ATTR(SW
, sw
);
1128 static struct attribute
*input_dev_caps_attrs
[] = {
1141 static struct attribute_group input_dev_caps_attr_group
= {
1142 .name
= "capabilities",
1143 .attrs
= input_dev_caps_attrs
,
1146 static struct attribute_group
*input_dev_attr_groups
[] = {
1147 &input_dev_attr_group
,
1148 &input_dev_id_attr_group
,
1149 &input_dev_caps_attr_group
,
1153 static void input_dev_release(struct device
*device
)
1155 struct input_dev
*dev
= to_input_dev(device
);
1157 input_ff_destroy(dev
);
1160 module_put(THIS_MODULE
);
1164 * Input uevent interface - loading event handlers based on
1167 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1168 const char *name
, unsigned long *bitmap
, int max
)
1172 if (add_uevent_var(env
, "%s=", name
))
1175 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1176 sizeof(env
->buf
) - env
->buflen
,
1178 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1185 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1186 struct input_dev
*dev
)
1190 if (add_uevent_var(env
, "MODALIAS="))
1193 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1194 sizeof(env
->buf
) - env
->buflen
,
1196 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1203 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1205 int err = add_uevent_var(env, fmt, val); \
1210 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1212 int err = input_add_uevent_bm_var(env, name, bm, max); \
1217 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1219 int err = input_add_uevent_modalias_var(env, dev); \
1224 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1226 struct input_dev
*dev
= to_input_dev(device
);
1228 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1229 dev
->id
.bustype
, dev
->id
.vendor
,
1230 dev
->id
.product
, dev
->id
.version
);
1232 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1234 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1236 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1238 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1239 if (test_bit(EV_KEY
, dev
->evbit
))
1240 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1241 if (test_bit(EV_REL
, dev
->evbit
))
1242 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1243 if (test_bit(EV_ABS
, dev
->evbit
))
1244 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1245 if (test_bit(EV_MSC
, dev
->evbit
))
1246 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1247 if (test_bit(EV_LED
, dev
->evbit
))
1248 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1249 if (test_bit(EV_SND
, dev
->evbit
))
1250 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1251 if (test_bit(EV_FF
, dev
->evbit
))
1252 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1253 if (test_bit(EV_SW
, dev
->evbit
))
1254 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1256 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1261 static struct device_type input_dev_type
= {
1262 .groups
= input_dev_attr_groups
,
1263 .release
= input_dev_release
,
1264 .uevent
= input_dev_uevent
,
1267 struct class input_class
= {
1270 EXPORT_SYMBOL_GPL(input_class
);
1273 * input_allocate_device - allocate memory for new input device
1275 * Returns prepared struct input_dev or NULL.
1277 * NOTE: Use input_free_device() to free devices that have not been
1278 * registered; input_unregister_device() should be used for already
1279 * registered devices.
1281 struct input_dev
*input_allocate_device(void)
1283 struct input_dev
*dev
;
1285 dev
= kzalloc(sizeof(struct input_dev
), GFP_KERNEL
);
1287 dev
->dev
.type
= &input_dev_type
;
1288 dev
->dev
.class = &input_class
;
1289 device_initialize(&dev
->dev
);
1290 mutex_init(&dev
->mutex
);
1291 spin_lock_init(&dev
->event_lock
);
1292 INIT_LIST_HEAD(&dev
->h_list
);
1293 INIT_LIST_HEAD(&dev
->node
);
1295 __module_get(THIS_MODULE
);
1300 EXPORT_SYMBOL(input_allocate_device
);
1303 * input_free_device - free memory occupied by input_dev structure
1304 * @dev: input device to free
1306 * This function should only be used if input_register_device()
1307 * was not called yet or if it failed. Once device was registered
1308 * use input_unregister_device() and memory will be freed once last
1309 * reference to the device is dropped.
1311 * Device should be allocated by input_allocate_device().
1313 * NOTE: If there are references to the input device then memory
1314 * will not be freed until last reference is dropped.
1316 void input_free_device(struct input_dev
*dev
)
1319 input_put_device(dev
);
1321 EXPORT_SYMBOL(input_free_device
);
1324 * input_set_capability - mark device as capable of a certain event
1325 * @dev: device that is capable of emitting or accepting event
1326 * @type: type of the event (EV_KEY, EV_REL, etc...)
1329 * In addition to setting up corresponding bit in appropriate capability
1330 * bitmap the function also adjusts dev->evbit.
1332 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1336 __set_bit(code
, dev
->keybit
);
1340 __set_bit(code
, dev
->relbit
);
1344 __set_bit(code
, dev
->absbit
);
1348 __set_bit(code
, dev
->mscbit
);
1352 __set_bit(code
, dev
->swbit
);
1356 __set_bit(code
, dev
->ledbit
);
1360 __set_bit(code
, dev
->sndbit
);
1364 __set_bit(code
, dev
->ffbit
);
1373 "input_set_capability: unknown type %u (code %u)\n",
1379 __set_bit(type
, dev
->evbit
);
1381 EXPORT_SYMBOL(input_set_capability
);
1384 * input_register_device - register device with input core
1385 * @dev: device to be registered
1387 * This function registers device with input core. The device must be
1388 * allocated with input_allocate_device() and all it's capabilities
1389 * set up before registering.
1390 * If function fails the device must be freed with input_free_device().
1391 * Once device has been successfully registered it can be unregistered
1392 * with input_unregister_device(); input_free_device() should not be
1393 * called in this case.
1395 int input_register_device(struct input_dev
*dev
)
1397 static atomic_t input_no
= ATOMIC_INIT(0);
1398 struct input_handler
*handler
;
1402 __set_bit(EV_SYN
, dev
->evbit
);
1405 * If delay and period are pre-set by the driver, then autorepeating
1406 * is handled by the driver itself and we don't do it in input.c.
1409 init_timer(&dev
->timer
);
1410 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
1411 dev
->timer
.data
= (long) dev
;
1412 dev
->timer
.function
= input_repeat_key
;
1413 dev
->rep
[REP_DELAY
] = 250;
1414 dev
->rep
[REP_PERIOD
] = 33;
1417 if (!dev
->getkeycode
)
1418 dev
->getkeycode
= input_default_getkeycode
;
1420 if (!dev
->setkeycode
)
1421 dev
->setkeycode
= input_default_setkeycode
;
1423 dev_set_name(&dev
->dev
, "input%ld",
1424 (unsigned long) atomic_inc_return(&input_no
) - 1);
1426 error
= device_add(&dev
->dev
);
1430 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1431 printk(KERN_INFO
"input: %s as %s\n",
1432 dev
->name
? dev
->name
: "Unspecified device", path
? path
: "N/A");
1435 error
= mutex_lock_interruptible(&input_mutex
);
1437 device_del(&dev
->dev
);
1441 list_add_tail(&dev
->node
, &input_dev_list
);
1443 list_for_each_entry(handler
, &input_handler_list
, node
)
1444 input_attach_handler(dev
, handler
);
1446 input_wakeup_procfs_readers();
1448 mutex_unlock(&input_mutex
);
1452 EXPORT_SYMBOL(input_register_device
);
1455 * input_unregister_device - unregister previously registered device
1456 * @dev: device to be unregistered
1458 * This function unregisters an input device. Once device is unregistered
1459 * the caller should not try to access it as it may get freed at any moment.
1461 void input_unregister_device(struct input_dev
*dev
)
1463 struct input_handle
*handle
, *next
;
1465 input_disconnect_device(dev
);
1467 mutex_lock(&input_mutex
);
1469 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1470 handle
->handler
->disconnect(handle
);
1471 WARN_ON(!list_empty(&dev
->h_list
));
1473 del_timer_sync(&dev
->timer
);
1474 list_del_init(&dev
->node
);
1476 input_wakeup_procfs_readers();
1478 mutex_unlock(&input_mutex
);
1480 device_unregister(&dev
->dev
);
1482 EXPORT_SYMBOL(input_unregister_device
);
1485 * input_register_handler - register a new input handler
1486 * @handler: handler to be registered
1488 * This function registers a new input handler (interface) for input
1489 * devices in the system and attaches it to all input devices that
1490 * are compatible with the handler.
1492 int input_register_handler(struct input_handler
*handler
)
1494 struct input_dev
*dev
;
1497 retval
= mutex_lock_interruptible(&input_mutex
);
1501 INIT_LIST_HEAD(&handler
->h_list
);
1503 if (handler
->fops
!= NULL
) {
1504 if (input_table
[handler
->minor
>> 5]) {
1508 input_table
[handler
->minor
>> 5] = handler
;
1511 list_add_tail(&handler
->node
, &input_handler_list
);
1513 list_for_each_entry(dev
, &input_dev_list
, node
)
1514 input_attach_handler(dev
, handler
);
1516 input_wakeup_procfs_readers();
1519 mutex_unlock(&input_mutex
);
1522 EXPORT_SYMBOL(input_register_handler
);
1525 * input_unregister_handler - unregisters an input handler
1526 * @handler: handler to be unregistered
1528 * This function disconnects a handler from its input devices and
1529 * removes it from lists of known handlers.
1531 void input_unregister_handler(struct input_handler
*handler
)
1533 struct input_handle
*handle
, *next
;
1535 mutex_lock(&input_mutex
);
1537 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
1538 handler
->disconnect(handle
);
1539 WARN_ON(!list_empty(&handler
->h_list
));
1541 list_del_init(&handler
->node
);
1543 if (handler
->fops
!= NULL
)
1544 input_table
[handler
->minor
>> 5] = NULL
;
1546 input_wakeup_procfs_readers();
1548 mutex_unlock(&input_mutex
);
1550 EXPORT_SYMBOL(input_unregister_handler
);
1553 * input_register_handle - register a new input handle
1554 * @handle: handle to register
1556 * This function puts a new input handle onto device's
1557 * and handler's lists so that events can flow through
1558 * it once it is opened using input_open_device().
1560 * This function is supposed to be called from handler's
1563 int input_register_handle(struct input_handle
*handle
)
1565 struct input_handler
*handler
= handle
->handler
;
1566 struct input_dev
*dev
= handle
->dev
;
1570 * We take dev->mutex here to prevent race with
1571 * input_release_device().
1573 error
= mutex_lock_interruptible(&dev
->mutex
);
1576 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
1577 mutex_unlock(&dev
->mutex
);
1580 * Since we are supposed to be called from ->connect()
1581 * which is mutually exclusive with ->disconnect()
1582 * we can't be racing with input_unregister_handle()
1583 * and so separate lock is not needed here.
1585 list_add_tail(&handle
->h_node
, &handler
->h_list
);
1588 handler
->start(handle
);
1592 EXPORT_SYMBOL(input_register_handle
);
1595 * input_unregister_handle - unregister an input handle
1596 * @handle: handle to unregister
1598 * This function removes input handle from device's
1599 * and handler's lists.
1601 * This function is supposed to be called from handler's
1602 * disconnect() method.
1604 void input_unregister_handle(struct input_handle
*handle
)
1606 struct input_dev
*dev
= handle
->dev
;
1608 list_del_init(&handle
->h_node
);
1611 * Take dev->mutex to prevent race with input_release_device().
1613 mutex_lock(&dev
->mutex
);
1614 list_del_rcu(&handle
->d_node
);
1615 mutex_unlock(&dev
->mutex
);
1618 EXPORT_SYMBOL(input_unregister_handle
);
1620 static int input_open_file(struct inode
*inode
, struct file
*file
)
1622 struct input_handler
*handler
;
1623 const struct file_operations
*old_fops
, *new_fops
= NULL
;
1627 /* No load-on-demand here? */
1628 handler
= input_table
[iminor(inode
) >> 5];
1629 if (!handler
|| !(new_fops
= fops_get(handler
->fops
))) {
1635 * That's _really_ odd. Usually NULL ->open means "nothing special",
1636 * not "no device". Oh, well...
1638 if (!new_fops
->open
) {
1643 old_fops
= file
->f_op
;
1644 file
->f_op
= new_fops
;
1646 err
= new_fops
->open(inode
, file
);
1649 fops_put(file
->f_op
);
1650 file
->f_op
= fops_get(old_fops
);
1658 static const struct file_operations input_fops
= {
1659 .owner
= THIS_MODULE
,
1660 .open
= input_open_file
,
1663 static void __init
input_init_abs_bypass(void)
1665 const unsigned int *p
;
1667 for (p
= input_abs_bypass_init_data
; *p
; p
++)
1668 input_abs_bypass
[BIT_WORD(*p
)] |= BIT_MASK(*p
);
1671 static int __init
input_init(void)
1675 input_init_abs_bypass();
1677 err
= class_register(&input_class
);
1679 printk(KERN_ERR
"input: unable to register input_dev class\n");
1683 err
= input_proc_init();
1687 err
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
1689 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
1695 fail2
: input_proc_exit();
1696 fail1
: class_unregister(&input_class
);
1700 static void __exit
input_exit(void)
1703 unregister_chrdev(INPUT_MAJOR
, "input");
1704 class_unregister(&input_class
);
1707 subsys_initcall(input_init
);
1708 module_exit(input_exit
);