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>
25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
26 MODULE_DESCRIPTION("Input core");
27 MODULE_LICENSE("GPL");
29 #define INPUT_DEVICES 256
31 static LIST_HEAD(input_dev_list
);
32 static LIST_HEAD(input_handler_list
);
35 * input_mutex protects access to both input_dev_list and input_handler_list.
36 * This also causes input_[un]register_device and input_[un]register_handler
37 * be mutually exclusive which simplifies locking in drivers implementing
40 static DEFINE_MUTEX(input_mutex
);
42 static struct input_handler
*input_table
[8];
44 static inline int is_event_supported(unsigned int code
,
45 unsigned long *bm
, unsigned int max
)
47 return code
<= max
&& test_bit(code
, bm
);
50 static int input_defuzz_abs_event(int value
, int old_val
, int fuzz
)
53 if (value
> old_val
- fuzz
/ 2 && value
< old_val
+ fuzz
/ 2)
56 if (value
> old_val
- fuzz
&& value
< old_val
+ fuzz
)
57 return (old_val
* 3 + value
) / 4;
59 if (value
> old_val
- fuzz
* 2 && value
< old_val
+ fuzz
* 2)
60 return (old_val
+ value
) / 2;
67 * Pass event through all open handles. This function is called with
68 * dev->event_lock held and interrupts disabled. Because of that we
69 * do not need to use rcu_read_lock() here although we are using RCU
70 * to access handle list. Note that because of that write-side uses
71 * synchronize_sched() instead of synchronize_ru().
73 static void input_pass_event(struct input_dev
*dev
,
74 unsigned int type
, unsigned int code
, int value
)
76 struct input_handle
*handle
= rcu_dereference(dev
->grab
);
79 handle
->handler
->event(handle
, type
, code
, value
);
81 list_for_each_entry_rcu(handle
, &dev
->h_list
, d_node
)
83 handle
->handler
->event(handle
,
88 * Generate software autorepeat event. Note that we take
89 * dev->event_lock here to avoid racing with input_event
90 * which may cause keys get "stuck".
92 static void input_repeat_key(unsigned long data
)
94 struct input_dev
*dev
= (void *) data
;
97 spin_lock_irqsave(&dev
->event_lock
, flags
);
99 if (test_bit(dev
->repeat_key
, dev
->key
) &&
100 is_event_supported(dev
->repeat_key
, dev
->keybit
, KEY_MAX
)) {
102 input_pass_event(dev
, EV_KEY
, dev
->repeat_key
, 2);
106 * Only send SYN_REPORT if we are not in a middle
107 * of driver parsing a new hardware packet.
108 * Otherwise assume that the driver will send
109 * SYN_REPORT once it's done.
111 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
114 if (dev
->rep
[REP_PERIOD
])
115 mod_timer(&dev
->timer
, jiffies
+
116 msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
119 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
122 static void input_start_autorepeat(struct input_dev
*dev
, int code
)
124 if (test_bit(EV_REP
, dev
->evbit
) &&
125 dev
->rep
[REP_PERIOD
] && dev
->rep
[REP_DELAY
] &&
127 dev
->repeat_key
= code
;
128 mod_timer(&dev
->timer
,
129 jiffies
+ msecs_to_jiffies(dev
->rep
[REP_DELAY
]));
133 #define INPUT_IGNORE_EVENT 0
134 #define INPUT_PASS_TO_HANDLERS 1
135 #define INPUT_PASS_TO_DEVICE 2
136 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
138 static void input_handle_event(struct input_dev
*dev
,
139 unsigned int type
, unsigned int code
, int value
)
141 int disposition
= INPUT_IGNORE_EVENT
;
148 disposition
= INPUT_PASS_TO_ALL
;
154 disposition
= INPUT_PASS_TO_HANDLERS
;
161 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
162 !!test_bit(code
, dev
->key
) != value
) {
165 __change_bit(code
, dev
->key
);
167 input_start_autorepeat(dev
, code
);
170 disposition
= INPUT_PASS_TO_HANDLERS
;
175 if (is_event_supported(code
, dev
->swbit
, SW_MAX
) &&
176 !!test_bit(code
, dev
->sw
) != value
) {
178 __change_bit(code
, dev
->sw
);
179 disposition
= INPUT_PASS_TO_HANDLERS
;
184 if (is_event_supported(code
, dev
->absbit
, ABS_MAX
)) {
186 value
= input_defuzz_abs_event(value
,
187 dev
->abs
[code
], dev
->absfuzz
[code
]);
189 if (dev
->abs
[code
] != value
) {
190 dev
->abs
[code
] = value
;
191 disposition
= INPUT_PASS_TO_HANDLERS
;
197 if (is_event_supported(code
, dev
->relbit
, REL_MAX
) && value
)
198 disposition
= INPUT_PASS_TO_HANDLERS
;
203 if (is_event_supported(code
, dev
->mscbit
, MSC_MAX
))
204 disposition
= INPUT_PASS_TO_ALL
;
209 if (is_event_supported(code
, dev
->ledbit
, LED_MAX
) &&
210 !!test_bit(code
, dev
->led
) != value
) {
212 __change_bit(code
, dev
->led
);
213 disposition
= INPUT_PASS_TO_ALL
;
218 if (is_event_supported(code
, dev
->sndbit
, SND_MAX
)) {
220 if (!!test_bit(code
, dev
->snd
) != !!value
)
221 __change_bit(code
, dev
->snd
);
222 disposition
= INPUT_PASS_TO_ALL
;
227 if (code
<= REP_MAX
&& value
>= 0 && dev
->rep
[code
] != value
) {
228 dev
->rep
[code
] = value
;
229 disposition
= INPUT_PASS_TO_ALL
;
235 disposition
= INPUT_PASS_TO_ALL
;
242 if ((disposition
& INPUT_PASS_TO_DEVICE
) && dev
->event
)
243 dev
->event(dev
, type
, code
, value
);
245 if (disposition
& INPUT_PASS_TO_HANDLERS
)
246 input_pass_event(dev
, type
, code
, value
);
250 * input_event() - report new input event
251 * @dev: device that generated the event
252 * @type: type of the event
254 * @value: value of the event
256 * This function should be used by drivers implementing various input
257 * devices. See also input_inject_event().
260 void input_event(struct input_dev
*dev
,
261 unsigned int type
, unsigned int code
, int value
)
265 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
267 spin_lock_irqsave(&dev
->event_lock
, flags
);
268 add_input_randomness(type
, code
, value
);
269 input_handle_event(dev
, type
, code
, value
);
270 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
273 EXPORT_SYMBOL(input_event
);
276 * input_inject_event() - send input event from input handler
277 * @handle: input handle to send event through
278 * @type: type of the event
280 * @value: value of the event
282 * Similar to input_event() but will ignore event if device is
283 * "grabbed" and handle injecting event is not the one that owns
286 void input_inject_event(struct input_handle
*handle
,
287 unsigned int type
, unsigned int code
, int value
)
289 struct input_dev
*dev
= handle
->dev
;
290 struct input_handle
*grab
;
293 if (is_event_supported(type
, dev
->evbit
, EV_MAX
)) {
294 spin_lock_irqsave(&dev
->event_lock
, flags
);
296 grab
= rcu_dereference(dev
->grab
);
297 if (!grab
|| grab
== handle
)
298 input_handle_event(dev
, type
, code
, value
);
300 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
303 EXPORT_SYMBOL(input_inject_event
);
306 * input_grab_device - grabs device for exclusive use
307 * @handle: input handle that wants to own the device
309 * When a device is grabbed by an input handle all events generated by
310 * the device are delivered only to this handle. Also events injected
311 * by other input handles are ignored while device is grabbed.
313 int input_grab_device(struct input_handle
*handle
)
315 struct input_dev
*dev
= handle
->dev
;
318 retval
= mutex_lock_interruptible(&dev
->mutex
);
327 rcu_assign_pointer(dev
->grab
, handle
);
329 * Not using synchronize_rcu() because read-side is protected
330 * by a spinlock with interrupts off instead of rcu_read_lock().
335 mutex_unlock(&dev
->mutex
);
338 EXPORT_SYMBOL(input_grab_device
);
340 static void __input_release_device(struct input_handle
*handle
)
342 struct input_dev
*dev
= handle
->dev
;
344 if (dev
->grab
== handle
) {
345 rcu_assign_pointer(dev
->grab
, NULL
);
346 /* Make sure input_pass_event() notices that grab is gone */
349 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
350 if (handle
->open
&& handle
->handler
->start
)
351 handle
->handler
->start(handle
);
356 * input_release_device - release previously grabbed device
357 * @handle: input handle that owns the device
359 * Releases previously grabbed device so that other input handles can
360 * start receiving input events. Upon release all handlers attached
361 * to the device have their start() method called so they have a change
362 * to synchronize device state with the rest of the system.
364 void input_release_device(struct input_handle
*handle
)
366 struct input_dev
*dev
= handle
->dev
;
368 mutex_lock(&dev
->mutex
);
369 __input_release_device(handle
);
370 mutex_unlock(&dev
->mutex
);
372 EXPORT_SYMBOL(input_release_device
);
375 * input_open_device - open input device
376 * @handle: handle through which device is being accessed
378 * This function should be called by input handlers when they
379 * want to start receive events from given input device.
381 int input_open_device(struct input_handle
*handle
)
383 struct input_dev
*dev
= handle
->dev
;
386 retval
= mutex_lock_interruptible(&dev
->mutex
);
390 if (dev
->going_away
) {
397 if (!dev
->users
++ && dev
->open
)
398 retval
= dev
->open(dev
);
402 if (!--handle
->open
) {
404 * Make sure we are not delivering any more events
405 * through this handle
412 mutex_unlock(&dev
->mutex
);
415 EXPORT_SYMBOL(input_open_device
);
417 int input_flush_device(struct input_handle
*handle
, struct file
*file
)
419 struct input_dev
*dev
= handle
->dev
;
422 retval
= mutex_lock_interruptible(&dev
->mutex
);
427 retval
= dev
->flush(dev
, file
);
429 mutex_unlock(&dev
->mutex
);
432 EXPORT_SYMBOL(input_flush_device
);
435 * input_close_device - close input device
436 * @handle: handle through which device is being accessed
438 * This function should be called by input handlers when they
439 * want to stop receive events from given input device.
441 void input_close_device(struct input_handle
*handle
)
443 struct input_dev
*dev
= handle
->dev
;
445 mutex_lock(&dev
->mutex
);
447 __input_release_device(handle
);
449 if (!--dev
->users
&& dev
->close
)
452 if (!--handle
->open
) {
454 * synchronize_sched() makes sure that input_pass_event()
455 * completed and that no more input events are delivered
456 * through this handle
461 mutex_unlock(&dev
->mutex
);
463 EXPORT_SYMBOL(input_close_device
);
466 * Prepare device for unregistering
468 static void input_disconnect_device(struct input_dev
*dev
)
470 struct input_handle
*handle
;
474 * Mark device as going away. Note that we take dev->mutex here
475 * not to protect access to dev->going_away but rather to ensure
476 * that there are no threads in the middle of input_open_device()
478 mutex_lock(&dev
->mutex
);
480 mutex_unlock(&dev
->mutex
);
482 spin_lock_irq(&dev
->event_lock
);
485 * Simulate keyup events for all pressed keys so that handlers
486 * are not left with "stuck" keys. The driver may continue
487 * generate events even after we done here but they will not
488 * reach any handlers.
490 if (is_event_supported(EV_KEY
, dev
->evbit
, EV_MAX
)) {
491 for (code
= 0; code
<= KEY_MAX
; code
++) {
492 if (is_event_supported(code
, dev
->keybit
, KEY_MAX
) &&
493 test_bit(code
, dev
->key
)) {
494 input_pass_event(dev
, EV_KEY
, code
, 0);
497 input_pass_event(dev
, EV_SYN
, SYN_REPORT
, 1);
500 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
503 spin_unlock_irq(&dev
->event_lock
);
506 static int input_fetch_keycode(struct input_dev
*dev
, int scancode
)
508 switch (dev
->keycodesize
) {
510 return ((u8
*)dev
->keycode
)[scancode
];
513 return ((u16
*)dev
->keycode
)[scancode
];
516 return ((u32
*)dev
->keycode
)[scancode
];
520 static int input_default_getkeycode(struct input_dev
*dev
,
521 int scancode
, int *keycode
)
523 if (!dev
->keycodesize
)
526 if (scancode
< 0 || scancode
>= dev
->keycodemax
)
529 *keycode
= input_fetch_keycode(dev
, scancode
);
534 static int input_default_setkeycode(struct input_dev
*dev
,
535 int scancode
, int keycode
)
540 if (scancode
< 0 || scancode
>= dev
->keycodemax
)
543 if (keycode
< 0 || keycode
> KEY_MAX
)
546 if (!dev
->keycodesize
)
549 if (dev
->keycodesize
< sizeof(keycode
) && (keycode
>> (dev
->keycodesize
* 8)))
552 switch (dev
->keycodesize
) {
554 u8
*k
= (u8
*)dev
->keycode
;
555 old_keycode
= k
[scancode
];
556 k
[scancode
] = keycode
;
560 u16
*k
= (u16
*)dev
->keycode
;
561 old_keycode
= k
[scancode
];
562 k
[scancode
] = keycode
;
566 u32
*k
= (u32
*)dev
->keycode
;
567 old_keycode
= k
[scancode
];
568 k
[scancode
] = keycode
;
573 clear_bit(old_keycode
, dev
->keybit
);
574 set_bit(keycode
, dev
->keybit
);
576 for (i
= 0; i
< dev
->keycodemax
; i
++) {
577 if (input_fetch_keycode(dev
, i
) == old_keycode
) {
578 set_bit(old_keycode
, dev
->keybit
);
579 break; /* Setting the bit twice is useless, so break */
587 #define MATCH_BIT(bit, max) \
588 for (i = 0; i < NBITS(max); i++) \
589 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
591 if (i != NBITS(max)) \
594 static const struct input_device_id
*input_match_device(const struct input_device_id
*id
,
595 struct input_dev
*dev
)
599 for (; id
->flags
|| id
->driver_info
; id
++) {
601 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
602 if (id
->bustype
!= dev
->id
.bustype
)
605 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
606 if (id
->vendor
!= dev
->id
.vendor
)
609 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
610 if (id
->product
!= dev
->id
.product
)
613 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
614 if (id
->version
!= dev
->id
.version
)
617 MATCH_BIT(evbit
, EV_MAX
);
618 MATCH_BIT(keybit
, KEY_MAX
);
619 MATCH_BIT(relbit
, REL_MAX
);
620 MATCH_BIT(absbit
, ABS_MAX
);
621 MATCH_BIT(mscbit
, MSC_MAX
);
622 MATCH_BIT(ledbit
, LED_MAX
);
623 MATCH_BIT(sndbit
, SND_MAX
);
624 MATCH_BIT(ffbit
, FF_MAX
);
625 MATCH_BIT(swbit
, SW_MAX
);
633 static int input_attach_handler(struct input_dev
*dev
, struct input_handler
*handler
)
635 const struct input_device_id
*id
;
638 if (handler
->blacklist
&& input_match_device(handler
->blacklist
, dev
))
641 id
= input_match_device(handler
->id_table
, dev
);
645 error
= handler
->connect(handler
, dev
, id
);
646 if (error
&& error
!= -ENODEV
)
648 "input: failed to attach handler %s to device %s, "
650 handler
->name
, kobject_name(&dev
->dev
.kobj
), error
);
656 #ifdef CONFIG_PROC_FS
658 static struct proc_dir_entry
*proc_bus_input_dir
;
659 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
660 static int input_devices_state
;
662 static inline void input_wakeup_procfs_readers(void)
664 input_devices_state
++;
665 wake_up(&input_devices_poll_wait
);
668 static unsigned int input_proc_devices_poll(struct file
*file
, poll_table
*wait
)
670 int state
= input_devices_state
;
672 poll_wait(file
, &input_devices_poll_wait
, wait
);
673 if (state
!= input_devices_state
)
674 return POLLIN
| POLLRDNORM
;
679 static void *input_devices_seq_start(struct seq_file
*seq
, loff_t
*pos
)
681 if (mutex_lock_interruptible(&input_mutex
))
684 return seq_list_start(&input_dev_list
, *pos
);
687 static void *input_devices_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
689 return seq_list_next(v
, &input_dev_list
, pos
);
692 static void input_devices_seq_stop(struct seq_file
*seq
, void *v
)
694 mutex_unlock(&input_mutex
);
697 static void input_seq_print_bitmap(struct seq_file
*seq
, const char *name
,
698 unsigned long *bitmap
, int max
)
702 for (i
= NBITS(max
) - 1; i
> 0; i
--)
706 seq_printf(seq
, "B: %s=", name
);
708 seq_printf(seq
, "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
712 static int input_devices_seq_show(struct seq_file
*seq
, void *v
)
714 struct input_dev
*dev
= container_of(v
, struct input_dev
, node
);
715 const char *path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
716 struct input_handle
*handle
;
718 seq_printf(seq
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
719 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
721 seq_printf(seq
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
722 seq_printf(seq
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
723 seq_printf(seq
, "S: Sysfs=%s\n", path
? path
: "");
724 seq_printf(seq
, "U: Uniq=%s\n", dev
->uniq
? dev
->uniq
: "");
725 seq_printf(seq
, "H: Handlers=");
727 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
728 seq_printf(seq
, "%s ", handle
->name
);
731 input_seq_print_bitmap(seq
, "EV", dev
->evbit
, EV_MAX
);
732 if (test_bit(EV_KEY
, dev
->evbit
))
733 input_seq_print_bitmap(seq
, "KEY", dev
->keybit
, KEY_MAX
);
734 if (test_bit(EV_REL
, dev
->evbit
))
735 input_seq_print_bitmap(seq
, "REL", dev
->relbit
, REL_MAX
);
736 if (test_bit(EV_ABS
, dev
->evbit
))
737 input_seq_print_bitmap(seq
, "ABS", dev
->absbit
, ABS_MAX
);
738 if (test_bit(EV_MSC
, dev
->evbit
))
739 input_seq_print_bitmap(seq
, "MSC", dev
->mscbit
, MSC_MAX
);
740 if (test_bit(EV_LED
, dev
->evbit
))
741 input_seq_print_bitmap(seq
, "LED", dev
->ledbit
, LED_MAX
);
742 if (test_bit(EV_SND
, dev
->evbit
))
743 input_seq_print_bitmap(seq
, "SND", dev
->sndbit
, SND_MAX
);
744 if (test_bit(EV_FF
, dev
->evbit
))
745 input_seq_print_bitmap(seq
, "FF", dev
->ffbit
, FF_MAX
);
746 if (test_bit(EV_SW
, dev
->evbit
))
747 input_seq_print_bitmap(seq
, "SW", dev
->swbit
, SW_MAX
);
755 static struct seq_operations input_devices_seq_ops
= {
756 .start
= input_devices_seq_start
,
757 .next
= input_devices_seq_next
,
758 .stop
= input_devices_seq_stop
,
759 .show
= input_devices_seq_show
,
762 static int input_proc_devices_open(struct inode
*inode
, struct file
*file
)
764 return seq_open(file
, &input_devices_seq_ops
);
767 static const struct file_operations input_devices_fileops
= {
768 .owner
= THIS_MODULE
,
769 .open
= input_proc_devices_open
,
770 .poll
= input_proc_devices_poll
,
773 .release
= seq_release
,
776 static void *input_handlers_seq_start(struct seq_file
*seq
, loff_t
*pos
)
778 if (mutex_lock_interruptible(&input_mutex
))
781 seq
->private = (void *)(unsigned long)*pos
;
782 return seq_list_start(&input_handler_list
, *pos
);
785 static void *input_handlers_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
787 seq
->private = (void *)(unsigned long)(*pos
+ 1);
788 return seq_list_next(v
, &input_handler_list
, pos
);
791 static void input_handlers_seq_stop(struct seq_file
*seq
, void *v
)
793 mutex_unlock(&input_mutex
);
796 static int input_handlers_seq_show(struct seq_file
*seq
, void *v
)
798 struct input_handler
*handler
= container_of(v
, struct input_handler
, node
);
800 seq_printf(seq
, "N: Number=%ld Name=%s",
801 (unsigned long)seq
->private, handler
->name
);
803 seq_printf(seq
, " Minor=%d", handler
->minor
);
808 static struct seq_operations input_handlers_seq_ops
= {
809 .start
= input_handlers_seq_start
,
810 .next
= input_handlers_seq_next
,
811 .stop
= input_handlers_seq_stop
,
812 .show
= input_handlers_seq_show
,
815 static int input_proc_handlers_open(struct inode
*inode
, struct file
*file
)
817 return seq_open(file
, &input_handlers_seq_ops
);
820 static const struct file_operations input_handlers_fileops
= {
821 .owner
= THIS_MODULE
,
822 .open
= input_proc_handlers_open
,
825 .release
= seq_release
,
828 static int __init
input_proc_init(void)
830 struct proc_dir_entry
*entry
;
832 proc_bus_input_dir
= proc_mkdir("input", proc_bus
);
833 if (!proc_bus_input_dir
)
836 proc_bus_input_dir
->owner
= THIS_MODULE
;
838 entry
= create_proc_entry("devices", 0, proc_bus_input_dir
);
842 entry
->owner
= THIS_MODULE
;
843 entry
->proc_fops
= &input_devices_fileops
;
845 entry
= create_proc_entry("handlers", 0, proc_bus_input_dir
);
849 entry
->owner
= THIS_MODULE
;
850 entry
->proc_fops
= &input_handlers_fileops
;
854 fail2
: remove_proc_entry("devices", proc_bus_input_dir
);
855 fail1
: remove_proc_entry("input", proc_bus
);
859 static void input_proc_exit(void)
861 remove_proc_entry("devices", proc_bus_input_dir
);
862 remove_proc_entry("handlers", proc_bus_input_dir
);
863 remove_proc_entry("input", proc_bus
);
866 #else /* !CONFIG_PROC_FS */
867 static inline void input_wakeup_procfs_readers(void) { }
868 static inline int input_proc_init(void) { return 0; }
869 static inline void input_proc_exit(void) { }
872 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
873 static ssize_t input_dev_show_##name(struct device *dev, \
874 struct device_attribute *attr, \
877 struct input_dev *input_dev = to_input_dev(dev); \
879 return scnprintf(buf, PAGE_SIZE, "%s\n", \
880 input_dev->name ? input_dev->name : ""); \
882 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
884 INPUT_DEV_STRING_ATTR_SHOW(name
);
885 INPUT_DEV_STRING_ATTR_SHOW(phys
);
886 INPUT_DEV_STRING_ATTR_SHOW(uniq
);
888 static int input_print_modalias_bits(char *buf
, int size
,
889 char name
, unsigned long *bm
,
890 unsigned int min_bit
, unsigned int max_bit
)
894 len
+= snprintf(buf
, max(size
, 0), "%c", name
);
895 for (i
= min_bit
; i
< max_bit
; i
++)
896 if (bm
[LONG(i
)] & BIT(i
))
897 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "%X,", i
);
901 static int input_print_modalias(char *buf
, int size
, struct input_dev
*id
,
906 len
= snprintf(buf
, max(size
, 0),
907 "input:b%04Xv%04Xp%04Xe%04X-",
908 id
->id
.bustype
, id
->id
.vendor
,
909 id
->id
.product
, id
->id
.version
);
911 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
912 'e', id
->evbit
, 0, EV_MAX
);
913 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
914 'k', id
->keybit
, KEY_MIN_INTERESTING
, KEY_MAX
);
915 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
916 'r', id
->relbit
, 0, REL_MAX
);
917 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
918 'a', id
->absbit
, 0, ABS_MAX
);
919 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
920 'm', id
->mscbit
, 0, MSC_MAX
);
921 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
922 'l', id
->ledbit
, 0, LED_MAX
);
923 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
924 's', id
->sndbit
, 0, SND_MAX
);
925 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
926 'f', id
->ffbit
, 0, FF_MAX
);
927 len
+= input_print_modalias_bits(buf
+ len
, size
- len
,
928 'w', id
->swbit
, 0, SW_MAX
);
931 len
+= snprintf(buf
+ len
, max(size
- len
, 0), "\n");
936 static ssize_t
input_dev_show_modalias(struct device
*dev
,
937 struct device_attribute
*attr
,
940 struct input_dev
*id
= to_input_dev(dev
);
943 len
= input_print_modalias(buf
, PAGE_SIZE
, id
, 1);
945 return min_t(int, len
, PAGE_SIZE
);
947 static DEVICE_ATTR(modalias
, S_IRUGO
, input_dev_show_modalias
, NULL
);
949 static struct attribute
*input_dev_attrs
[] = {
953 &dev_attr_modalias
.attr
,
957 static struct attribute_group input_dev_attr_group
= {
958 .attrs
= input_dev_attrs
,
961 #define INPUT_DEV_ID_ATTR(name) \
962 static ssize_t input_dev_show_id_##name(struct device *dev, \
963 struct device_attribute *attr, \
966 struct input_dev *input_dev = to_input_dev(dev); \
967 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
969 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
971 INPUT_DEV_ID_ATTR(bustype
);
972 INPUT_DEV_ID_ATTR(vendor
);
973 INPUT_DEV_ID_ATTR(product
);
974 INPUT_DEV_ID_ATTR(version
);
976 static struct attribute
*input_dev_id_attrs
[] = {
977 &dev_attr_bustype
.attr
,
978 &dev_attr_vendor
.attr
,
979 &dev_attr_product
.attr
,
980 &dev_attr_version
.attr
,
984 static struct attribute_group input_dev_id_attr_group
= {
986 .attrs
= input_dev_id_attrs
,
989 static int input_print_bitmap(char *buf
, int buf_size
, unsigned long *bitmap
,
995 for (i
= NBITS(max
) - 1; i
> 0; i
--)
1000 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0),
1001 "%lx%s", bitmap
[i
], i
> 0 ? " " : "");
1004 len
+= snprintf(buf
+ len
, max(buf_size
- len
, 0), "\n");
1009 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1010 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1011 struct device_attribute *attr, \
1014 struct input_dev *input_dev = to_input_dev(dev); \
1015 int len = input_print_bitmap(buf, PAGE_SIZE, \
1016 input_dev->bm##bit, ev##_MAX, 1); \
1017 return min_t(int, len, PAGE_SIZE); \
1019 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1021 INPUT_DEV_CAP_ATTR(EV
, ev
);
1022 INPUT_DEV_CAP_ATTR(KEY
, key
);
1023 INPUT_DEV_CAP_ATTR(REL
, rel
);
1024 INPUT_DEV_CAP_ATTR(ABS
, abs
);
1025 INPUT_DEV_CAP_ATTR(MSC
, msc
);
1026 INPUT_DEV_CAP_ATTR(LED
, led
);
1027 INPUT_DEV_CAP_ATTR(SND
, snd
);
1028 INPUT_DEV_CAP_ATTR(FF
, ff
);
1029 INPUT_DEV_CAP_ATTR(SW
, sw
);
1031 static struct attribute
*input_dev_caps_attrs
[] = {
1044 static struct attribute_group input_dev_caps_attr_group
= {
1045 .name
= "capabilities",
1046 .attrs
= input_dev_caps_attrs
,
1049 static struct attribute_group
*input_dev_attr_groups
[] = {
1050 &input_dev_attr_group
,
1051 &input_dev_id_attr_group
,
1052 &input_dev_caps_attr_group
,
1056 static void input_dev_release(struct device
*device
)
1058 struct input_dev
*dev
= to_input_dev(device
);
1060 input_ff_destroy(dev
);
1063 module_put(THIS_MODULE
);
1067 * Input uevent interface - loading event handlers based on
1070 static int input_add_uevent_bm_var(struct kobj_uevent_env
*env
,
1071 const char *name
, unsigned long *bitmap
, int max
)
1075 if (add_uevent_var(env
, "%s=", name
))
1078 len
= input_print_bitmap(&env
->buf
[env
->buflen
- 1],
1079 sizeof(env
->buf
) - env
->buflen
,
1081 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1088 static int input_add_uevent_modalias_var(struct kobj_uevent_env
*env
,
1089 struct input_dev
*dev
)
1093 if (add_uevent_var(env
, "MODALIAS="))
1096 len
= input_print_modalias(&env
->buf
[env
->buflen
- 1],
1097 sizeof(env
->buf
) - env
->buflen
,
1099 if (len
>= (sizeof(env
->buf
) - env
->buflen
))
1106 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1108 int err = add_uevent_var(env, fmt, val); \
1113 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1115 int err = input_add_uevent_bm_var(env, name, bm, max); \
1120 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1122 int err = input_add_uevent_modalias_var(env, dev); \
1127 static int input_dev_uevent(struct device
*device
, struct kobj_uevent_env
*env
)
1129 struct input_dev
*dev
= to_input_dev(device
);
1131 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1132 dev
->id
.bustype
, dev
->id
.vendor
,
1133 dev
->id
.product
, dev
->id
.version
);
1135 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev
->name
);
1137 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev
->phys
);
1139 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev
->uniq
);
1141 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev
->evbit
, EV_MAX
);
1142 if (test_bit(EV_KEY
, dev
->evbit
))
1143 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev
->keybit
, KEY_MAX
);
1144 if (test_bit(EV_REL
, dev
->evbit
))
1145 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev
->relbit
, REL_MAX
);
1146 if (test_bit(EV_ABS
, dev
->evbit
))
1147 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev
->absbit
, ABS_MAX
);
1148 if (test_bit(EV_MSC
, dev
->evbit
))
1149 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev
->mscbit
, MSC_MAX
);
1150 if (test_bit(EV_LED
, dev
->evbit
))
1151 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev
->ledbit
, LED_MAX
);
1152 if (test_bit(EV_SND
, dev
->evbit
))
1153 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev
->sndbit
, SND_MAX
);
1154 if (test_bit(EV_FF
, dev
->evbit
))
1155 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev
->ffbit
, FF_MAX
);
1156 if (test_bit(EV_SW
, dev
->evbit
))
1157 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev
->swbit
, SW_MAX
);
1159 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev
);
1164 static struct device_type input_dev_type
= {
1165 .groups
= input_dev_attr_groups
,
1166 .release
= input_dev_release
,
1167 .uevent
= input_dev_uevent
,
1170 struct class input_class
= {
1173 EXPORT_SYMBOL_GPL(input_class
);
1176 * input_allocate_device - allocate memory for new input device
1178 * Returns prepared struct input_dev or NULL.
1180 * NOTE: Use input_free_device() to free devices that have not been
1181 * registered; input_unregister_device() should be used for already
1182 * registered devices.
1184 struct input_dev
*input_allocate_device(void)
1186 struct input_dev
*dev
;
1188 dev
= kzalloc(sizeof(struct input_dev
), GFP_KERNEL
);
1190 dev
->dev
.type
= &input_dev_type
;
1191 dev
->dev
.class = &input_class
;
1192 device_initialize(&dev
->dev
);
1193 mutex_init(&dev
->mutex
);
1194 spin_lock_init(&dev
->event_lock
);
1195 INIT_LIST_HEAD(&dev
->h_list
);
1196 INIT_LIST_HEAD(&dev
->node
);
1198 __module_get(THIS_MODULE
);
1203 EXPORT_SYMBOL(input_allocate_device
);
1206 * input_free_device - free memory occupied by input_dev structure
1207 * @dev: input device to free
1209 * This function should only be used if input_register_device()
1210 * was not called yet or if it failed. Once device was registered
1211 * use input_unregister_device() and memory will be freed once last
1212 * reference to the device is dropped.
1214 * Device should be allocated by input_allocate_device().
1216 * NOTE: If there are references to the input device then memory
1217 * will not be freed until last reference is dropped.
1219 void input_free_device(struct input_dev
*dev
)
1222 input_put_device(dev
);
1224 EXPORT_SYMBOL(input_free_device
);
1227 * input_set_capability - mark device as capable of a certain event
1228 * @dev: device that is capable of emitting or accepting event
1229 * @type: type of the event (EV_KEY, EV_REL, etc...)
1232 * In addition to setting up corresponding bit in appropriate capability
1233 * bitmap the function also adjusts dev->evbit.
1235 void input_set_capability(struct input_dev
*dev
, unsigned int type
, unsigned int code
)
1239 __set_bit(code
, dev
->keybit
);
1243 __set_bit(code
, dev
->relbit
);
1247 __set_bit(code
, dev
->absbit
);
1251 __set_bit(code
, dev
->mscbit
);
1255 __set_bit(code
, dev
->swbit
);
1259 __set_bit(code
, dev
->ledbit
);
1263 __set_bit(code
, dev
->sndbit
);
1267 __set_bit(code
, dev
->ffbit
);
1272 "input_set_capability: unknown type %u (code %u)\n",
1278 __set_bit(type
, dev
->evbit
);
1280 EXPORT_SYMBOL(input_set_capability
);
1283 * input_register_device - register device with input core
1284 * @dev: device to be registered
1286 * This function registers device with input core. The device must be
1287 * allocated with input_allocate_device() and all it's capabilities
1288 * set up before registering.
1289 * If function fails the device must be freed with input_free_device().
1290 * Once device has been successfully registered it can be unregistered
1291 * with input_unregister_device(); input_free_device() should not be
1292 * called in this case.
1294 int input_register_device(struct input_dev
*dev
)
1296 static atomic_t input_no
= ATOMIC_INIT(0);
1297 struct input_handler
*handler
;
1301 __set_bit(EV_SYN
, dev
->evbit
);
1304 * If delay and period are pre-set by the driver, then autorepeating
1305 * is handled by the driver itself and we don't do it in input.c.
1308 init_timer(&dev
->timer
);
1309 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
1310 dev
->timer
.data
= (long) dev
;
1311 dev
->timer
.function
= input_repeat_key
;
1312 dev
->rep
[REP_DELAY
] = 250;
1313 dev
->rep
[REP_PERIOD
] = 33;
1316 if (!dev
->getkeycode
)
1317 dev
->getkeycode
= input_default_getkeycode
;
1319 if (!dev
->setkeycode
)
1320 dev
->setkeycode
= input_default_setkeycode
;
1322 snprintf(dev
->dev
.bus_id
, sizeof(dev
->dev
.bus_id
),
1323 "input%ld", (unsigned long) atomic_inc_return(&input_no
) - 1);
1326 dev
->dev
.parent
= dev
->cdev
.dev
;
1328 error
= device_add(&dev
->dev
);
1332 path
= kobject_get_path(&dev
->dev
.kobj
, GFP_KERNEL
);
1333 printk(KERN_INFO
"input: %s as %s\n",
1334 dev
->name
? dev
->name
: "Unspecified device", path
? path
: "N/A");
1337 error
= mutex_lock_interruptible(&input_mutex
);
1339 device_del(&dev
->dev
);
1343 list_add_tail(&dev
->node
, &input_dev_list
);
1345 list_for_each_entry(handler
, &input_handler_list
, node
)
1346 input_attach_handler(dev
, handler
);
1348 input_wakeup_procfs_readers();
1350 mutex_unlock(&input_mutex
);
1354 EXPORT_SYMBOL(input_register_device
);
1357 * input_unregister_device - unregister previously registered device
1358 * @dev: device to be unregistered
1360 * This function unregisters an input device. Once device is unregistered
1361 * the caller should not try to access it as it may get freed at any moment.
1363 void input_unregister_device(struct input_dev
*dev
)
1365 struct input_handle
*handle
, *next
;
1367 input_disconnect_device(dev
);
1369 mutex_lock(&input_mutex
);
1371 list_for_each_entry_safe(handle
, next
, &dev
->h_list
, d_node
)
1372 handle
->handler
->disconnect(handle
);
1373 WARN_ON(!list_empty(&dev
->h_list
));
1375 del_timer_sync(&dev
->timer
);
1376 list_del_init(&dev
->node
);
1378 input_wakeup_procfs_readers();
1380 mutex_unlock(&input_mutex
);
1382 device_unregister(&dev
->dev
);
1384 EXPORT_SYMBOL(input_unregister_device
);
1387 * input_register_handler - register a new input handler
1388 * @handler: handler to be registered
1390 * This function registers a new input handler (interface) for input
1391 * devices in the system and attaches it to all input devices that
1392 * are compatible with the handler.
1394 int input_register_handler(struct input_handler
*handler
)
1396 struct input_dev
*dev
;
1399 retval
= mutex_lock_interruptible(&input_mutex
);
1403 INIT_LIST_HEAD(&handler
->h_list
);
1405 if (handler
->fops
!= NULL
) {
1406 if (input_table
[handler
->minor
>> 5]) {
1410 input_table
[handler
->minor
>> 5] = handler
;
1413 list_add_tail(&handler
->node
, &input_handler_list
);
1415 list_for_each_entry(dev
, &input_dev_list
, node
)
1416 input_attach_handler(dev
, handler
);
1418 input_wakeup_procfs_readers();
1421 mutex_unlock(&input_mutex
);
1424 EXPORT_SYMBOL(input_register_handler
);
1427 * input_unregister_handler - unregisters an input handler
1428 * @handler: handler to be unregistered
1430 * This function disconnects a handler from its input devices and
1431 * removes it from lists of known handlers.
1433 void input_unregister_handler(struct input_handler
*handler
)
1435 struct input_handle
*handle
, *next
;
1437 mutex_lock(&input_mutex
);
1439 list_for_each_entry_safe(handle
, next
, &handler
->h_list
, h_node
)
1440 handler
->disconnect(handle
);
1441 WARN_ON(!list_empty(&handler
->h_list
));
1443 list_del_init(&handler
->node
);
1445 if (handler
->fops
!= NULL
)
1446 input_table
[handler
->minor
>> 5] = NULL
;
1448 input_wakeup_procfs_readers();
1450 mutex_unlock(&input_mutex
);
1452 EXPORT_SYMBOL(input_unregister_handler
);
1455 * input_register_handle - register a new input handle
1456 * @handle: handle to register
1458 * This function puts a new input handle onto device's
1459 * and handler's lists so that events can flow through
1460 * it once it is opened using input_open_device().
1462 * This function is supposed to be called from handler's
1465 int input_register_handle(struct input_handle
*handle
)
1467 struct input_handler
*handler
= handle
->handler
;
1468 struct input_dev
*dev
= handle
->dev
;
1472 * We take dev->mutex here to prevent race with
1473 * input_release_device().
1475 error
= mutex_lock_interruptible(&dev
->mutex
);
1478 list_add_tail_rcu(&handle
->d_node
, &dev
->h_list
);
1479 mutex_unlock(&dev
->mutex
);
1481 * We don't use synchronize_rcu() here because we rely
1482 * on dev->event_lock to protect read-side critical
1483 * section in input_pass_event().
1485 synchronize_sched();
1488 * Since we are supposed to be called from ->connect()
1489 * which is mutually exclusive with ->disconnect()
1490 * we can't be racing with input_unregister_handle()
1491 * and so separate lock is not needed here.
1493 list_add_tail(&handle
->h_node
, &handler
->h_list
);
1496 handler
->start(handle
);
1500 EXPORT_SYMBOL(input_register_handle
);
1503 * input_unregister_handle - unregister an input handle
1504 * @handle: handle to unregister
1506 * This function removes input handle from device's
1507 * and handler's lists.
1509 * This function is supposed to be called from handler's
1510 * disconnect() method.
1512 void input_unregister_handle(struct input_handle
*handle
)
1514 struct input_dev
*dev
= handle
->dev
;
1516 list_del_init(&handle
->h_node
);
1519 * Take dev->mutex to prevent race with input_release_device().
1521 mutex_lock(&dev
->mutex
);
1522 list_del_rcu(&handle
->d_node
);
1523 mutex_unlock(&dev
->mutex
);
1524 synchronize_sched();
1526 EXPORT_SYMBOL(input_unregister_handle
);
1528 static int input_open_file(struct inode
*inode
, struct file
*file
)
1530 struct input_handler
*handler
= input_table
[iminor(inode
) >> 5];
1531 const struct file_operations
*old_fops
, *new_fops
= NULL
;
1534 /* No load-on-demand here? */
1535 if (!handler
|| !(new_fops
= fops_get(handler
->fops
)))
1539 * That's _really_ odd. Usually NULL ->open means "nothing special",
1540 * not "no device". Oh, well...
1542 if (!new_fops
->open
) {
1546 old_fops
= file
->f_op
;
1547 file
->f_op
= new_fops
;
1549 err
= new_fops
->open(inode
, file
);
1552 fops_put(file
->f_op
);
1553 file
->f_op
= fops_get(old_fops
);
1559 static const struct file_operations input_fops
= {
1560 .owner
= THIS_MODULE
,
1561 .open
= input_open_file
,
1564 static int __init
input_init(void)
1568 err
= class_register(&input_class
);
1570 printk(KERN_ERR
"input: unable to register input_dev class\n");
1574 err
= input_proc_init();
1578 err
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
1580 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
1586 fail2
: input_proc_exit();
1587 fail1
: class_unregister(&input_class
);
1591 static void __exit
input_exit(void)
1594 unregister_chrdev(INPUT_MAJOR
, "input");
1595 class_unregister(&input_class
);
1598 subsys_initcall(input_init
);
1599 module_exit(input_exit
);