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/sched.h>
15 #include <linux/smp_lock.h>
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/random.h>
19 #include <linux/major.h>
20 #include <linux/proc_fs.h>
21 #include <linux/kobject_uevent.h>
22 #include <linux/interrupt.h>
23 #include <linux/poll.h>
24 #include <linux/device.h>
25 #include <linux/devfs_fs_kernel.h>
27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
28 MODULE_DESCRIPTION("Input core");
29 MODULE_LICENSE("GPL");
31 EXPORT_SYMBOL(input_register_device
);
32 EXPORT_SYMBOL(input_unregister_device
);
33 EXPORT_SYMBOL(input_register_handler
);
34 EXPORT_SYMBOL(input_unregister_handler
);
35 EXPORT_SYMBOL(input_grab_device
);
36 EXPORT_SYMBOL(input_release_device
);
37 EXPORT_SYMBOL(input_open_device
);
38 EXPORT_SYMBOL(input_close_device
);
39 EXPORT_SYMBOL(input_accept_process
);
40 EXPORT_SYMBOL(input_flush_device
);
41 EXPORT_SYMBOL(input_event
);
42 EXPORT_SYMBOL(input_class
);
44 #define INPUT_DEVICES 256
46 static LIST_HEAD(input_dev_list
);
47 static LIST_HEAD(input_handler_list
);
49 static struct input_handler
*input_table
[8];
52 static struct proc_dir_entry
*proc_bus_input_dir
;
53 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait
);
54 static int input_devices_state
;
57 void input_event(struct input_dev
*dev
, unsigned int type
, unsigned int code
, int value
)
59 struct input_handle
*handle
;
61 if (type
> EV_MAX
|| !test_bit(type
, dev
->evbit
))
64 add_input_randomness(type
, code
, value
);
71 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
75 if (dev
->sync
) return;
83 if (code
> KEY_MAX
|| !test_bit(code
, dev
->keybit
) || !!test_bit(code
, dev
->key
) == value
)
89 change_bit(code
, dev
->key
);
91 if (test_bit(EV_REP
, dev
->evbit
) && dev
->rep
[REP_PERIOD
] && dev
->rep
[REP_DELAY
] && dev
->timer
.data
&& value
) {
92 dev
->repeat_key
= code
;
93 mod_timer(&dev
->timer
, jiffies
+ msecs_to_jiffies(dev
->rep
[REP_DELAY
]));
100 if (code
> ABS_MAX
|| !test_bit(code
, dev
->absbit
))
103 if (dev
->absfuzz
[code
]) {
104 if ((value
> dev
->abs
[code
] - (dev
->absfuzz
[code
] >> 1)) &&
105 (value
< dev
->abs
[code
] + (dev
->absfuzz
[code
] >> 1)))
108 if ((value
> dev
->abs
[code
] - dev
->absfuzz
[code
]) &&
109 (value
< dev
->abs
[code
] + dev
->absfuzz
[code
]))
110 value
= (dev
->abs
[code
] * 3 + value
) >> 2;
112 if ((value
> dev
->abs
[code
] - (dev
->absfuzz
[code
] << 1)) &&
113 (value
< dev
->abs
[code
] + (dev
->absfuzz
[code
] << 1)))
114 value
= (dev
->abs
[code
] + value
) >> 1;
117 if (dev
->abs
[code
] == value
)
120 dev
->abs
[code
] = value
;
125 if (code
> REL_MAX
|| !test_bit(code
, dev
->relbit
) || (value
== 0))
132 if (code
> MSC_MAX
|| !test_bit(code
, dev
->mscbit
))
135 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
141 if (code
> LED_MAX
|| !test_bit(code
, dev
->ledbit
) || !!test_bit(code
, dev
->led
) == value
)
144 change_bit(code
, dev
->led
);
145 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
151 if (code
> SND_MAX
|| !test_bit(code
, dev
->sndbit
))
154 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
160 if (code
> REP_MAX
|| value
< 0 || dev
->rep
[code
] == value
) return;
162 dev
->rep
[code
] = value
;
163 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
168 if (dev
->event
) dev
->event(dev
, type
, code
, value
);
176 dev
->grab
->handler
->event(dev
->grab
, type
, code
, value
);
178 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
180 handle
->handler
->event(handle
, type
, code
, value
);
183 static void input_repeat_key(unsigned long data
)
185 struct input_dev
*dev
= (void *) data
;
187 if (!test_bit(dev
->repeat_key
, dev
->key
))
190 input_event(dev
, EV_KEY
, dev
->repeat_key
, 2);
193 if (dev
->rep
[REP_PERIOD
])
194 mod_timer(&dev
->timer
, jiffies
+ msecs_to_jiffies(dev
->rep
[REP_PERIOD
]));
197 int input_accept_process(struct input_handle
*handle
, struct file
*file
)
199 if (handle
->dev
->accept
)
200 return handle
->dev
->accept(handle
->dev
, file
);
205 int input_grab_device(struct input_handle
*handle
)
207 if (handle
->dev
->grab
)
210 handle
->dev
->grab
= handle
;
214 void input_release_device(struct input_handle
*handle
)
216 if (handle
->dev
->grab
== handle
)
217 handle
->dev
->grab
= NULL
;
220 int input_open_device(struct input_handle
*handle
)
222 struct input_dev
*dev
= handle
->dev
;
225 err
= down_interruptible(&dev
->sem
);
231 if (!dev
->users
++ && dev
->open
)
232 err
= dev
->open(dev
);
242 int input_flush_device(struct input_handle
* handle
, struct file
* file
)
244 if (handle
->dev
->flush
)
245 return handle
->dev
->flush(handle
->dev
, file
);
250 void input_close_device(struct input_handle
*handle
)
252 struct input_dev
*dev
= handle
->dev
;
254 input_release_device(handle
);
258 if (!--dev
->users
&& dev
->close
)
265 static void input_link_handle(struct input_handle
*handle
)
267 list_add_tail(&handle
->d_node
, &handle
->dev
->h_list
);
268 list_add_tail(&handle
->h_node
, &handle
->handler
->h_list
);
271 #define MATCH_BIT(bit, max) \
272 for (i = 0; i < NBITS(max); i++) \
273 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
275 if (i != NBITS(max)) \
278 static struct input_device_id
*input_match_device(struct input_device_id
*id
, struct input_dev
*dev
)
282 for (; id
->flags
|| id
->driver_info
; id
++) {
284 if (id
->flags
& INPUT_DEVICE_ID_MATCH_BUS
)
285 if (id
->id
.bustype
!= dev
->id
.bustype
)
288 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VENDOR
)
289 if (id
->id
.vendor
!= dev
->id
.vendor
)
292 if (id
->flags
& INPUT_DEVICE_ID_MATCH_PRODUCT
)
293 if (id
->id
.product
!= dev
->id
.product
)
296 if (id
->flags
& INPUT_DEVICE_ID_MATCH_VERSION
)
297 if (id
->id
.version
!= dev
->id
.version
)
300 MATCH_BIT(evbit
, EV_MAX
);
301 MATCH_BIT(keybit
, KEY_MAX
);
302 MATCH_BIT(relbit
, REL_MAX
);
303 MATCH_BIT(absbit
, ABS_MAX
);
304 MATCH_BIT(mscbit
, MSC_MAX
);
305 MATCH_BIT(ledbit
, LED_MAX
);
306 MATCH_BIT(sndbit
, SND_MAX
);
307 MATCH_BIT(ffbit
, FF_MAX
);
316 * Input hotplugging interface - loading event handlers based on
320 #ifdef CONFIG_HOTPLUG
323 * Input hotplugging invokes what /proc/sys/kernel/hotplug says
324 * (normally /sbin/hotplug) when input devices get added or removed.
326 * This invokes a user mode policy agent, typically helping to load driver
327 * or other modules, configure the device, and more. Drivers can provide
328 * a MODULE_DEVICE_TABLE to help with module loading subtasks.
332 #define SPRINTF_BIT_A(bit, name, max) \
334 envp[i++] = scratch; \
335 scratch += sprintf(scratch, name); \
336 for (j = NBITS(max) - 1; j >= 0; j--) \
337 if (dev->bit[j]) break; \
338 for (; j >= 0; j--) \
339 scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
343 #define SPRINTF_BIT_A2(bit, name, max, ev) \
345 if (test_bit(ev, dev->evbit)) \
346 SPRINTF_BIT_A(bit, name, max); \
349 static void input_call_hotplug(char *verb
, struct input_dev
*dev
)
351 char *argv
[3], **envp
, *buf
, *scratch
;
354 if (!hotplug_path
[0]) {
355 printk(KERN_ERR
"input.c: calling hotplug without a hotplug agent defined\n");
358 if (in_interrupt()) {
359 printk(KERN_ERR
"input.c: calling hotplug from interrupt\n");
362 if (!current
->fs
->root
) {
363 printk(KERN_WARNING
"input.c: calling hotplug without valid filesystem\n");
366 if (!(envp
= (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL
))) {
367 printk(KERN_ERR
"input.c: not enough memory allocating hotplug environment\n");
370 if (!(buf
= kmalloc(1024, GFP_KERNEL
))) {
372 printk(KERN_ERR
"input.c: not enough memory allocating hotplug environment\n");
376 argv
[0] = hotplug_path
;
380 envp
[i
++] = "HOME=/";
381 envp
[i
++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
386 scratch
+= sprintf(scratch
, "ACTION=%s", verb
) + 1;
389 scratch
+= sprintf(scratch
, "PRODUCT=%x/%x/%x/%x",
390 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
) + 1;
394 scratch
+= sprintf(scratch
, "NAME=%s", dev
->name
) + 1;
399 scratch
+= sprintf(scratch
, "PHYS=%s", dev
->phys
) + 1;
402 SPRINTF_BIT_A(evbit
, "EV=", EV_MAX
);
403 SPRINTF_BIT_A2(keybit
, "KEY=", KEY_MAX
, EV_KEY
);
404 SPRINTF_BIT_A2(relbit
, "REL=", REL_MAX
, EV_REL
);
405 SPRINTF_BIT_A2(absbit
, "ABS=", ABS_MAX
, EV_ABS
);
406 SPRINTF_BIT_A2(mscbit
, "MSC=", MSC_MAX
, EV_MSC
);
407 SPRINTF_BIT_A2(ledbit
, "LED=", LED_MAX
, EV_LED
);
408 SPRINTF_BIT_A2(sndbit
, "SND=", SND_MAX
, EV_SND
);
409 SPRINTF_BIT_A2(ffbit
, "FF=", FF_MAX
, EV_FF
);
414 printk(KERN_DEBUG
"input.c: calling %s %s [%s %s %s %s %s]\n",
415 argv
[0], argv
[1], envp
[0], envp
[1], envp
[2], envp
[3], envp
[4]);
418 value
= call_usermodehelper(argv
[0], argv
, envp
, 0);
425 printk(KERN_DEBUG
"input.c: hotplug returned %d\n", value
);
431 void input_register_device(struct input_dev
*dev
)
433 struct input_handle
*handle
;
434 struct input_handler
*handler
;
435 struct input_device_id
*id
;
437 set_bit(EV_SYN
, dev
->evbit
);
439 init_MUTEX(&dev
->sem
);
442 * If delay and period are pre-set by the driver, then autorepeating
443 * is handled by the driver itself and we don't do it in input.c.
446 init_timer(&dev
->timer
);
447 if (!dev
->rep
[REP_DELAY
] && !dev
->rep
[REP_PERIOD
]) {
448 dev
->timer
.data
= (long) dev
;
449 dev
->timer
.function
= input_repeat_key
;
450 dev
->rep
[REP_DELAY
] = 250;
451 dev
->rep
[REP_PERIOD
] = 33;
454 INIT_LIST_HEAD(&dev
->h_list
);
455 list_add_tail(&dev
->node
, &input_dev_list
);
457 list_for_each_entry(handler
, &input_handler_list
, node
)
458 if (!handler
->blacklist
|| !input_match_device(handler
->blacklist
, dev
))
459 if ((id
= input_match_device(handler
->id_table
, dev
)))
460 if ((handle
= handler
->connect(handler
, dev
, id
)))
461 input_link_handle(handle
);
463 #ifdef CONFIG_HOTPLUG
464 input_call_hotplug("add", dev
);
467 #ifdef CONFIG_PROC_FS
468 input_devices_state
++;
469 wake_up(&input_devices_poll_wait
);
473 void input_unregister_device(struct input_dev
*dev
)
475 struct list_head
* node
, * next
;
479 del_timer_sync(&dev
->timer
);
481 list_for_each_safe(node
, next
, &dev
->h_list
) {
482 struct input_handle
* handle
= to_handle(node
);
483 list_del_init(&handle
->d_node
);
484 list_del_init(&handle
->h_node
);
485 handle
->handler
->disconnect(handle
);
488 #ifdef CONFIG_HOTPLUG
489 input_call_hotplug("remove", dev
);
492 list_del_init(&dev
->node
);
494 #ifdef CONFIG_PROC_FS
495 input_devices_state
++;
496 wake_up(&input_devices_poll_wait
);
500 void input_register_handler(struct input_handler
*handler
)
502 struct input_dev
*dev
;
503 struct input_handle
*handle
;
504 struct input_device_id
*id
;
506 if (!handler
) return;
508 INIT_LIST_HEAD(&handler
->h_list
);
510 if (handler
->fops
!= NULL
)
511 input_table
[handler
->minor
>> 5] = handler
;
513 list_add_tail(&handler
->node
, &input_handler_list
);
515 list_for_each_entry(dev
, &input_dev_list
, node
)
516 if (!handler
->blacklist
|| !input_match_device(handler
->blacklist
, dev
))
517 if ((id
= input_match_device(handler
->id_table
, dev
)))
518 if ((handle
= handler
->connect(handler
, dev
, id
)))
519 input_link_handle(handle
);
521 #ifdef CONFIG_PROC_FS
522 input_devices_state
++;
523 wake_up(&input_devices_poll_wait
);
527 void input_unregister_handler(struct input_handler
*handler
)
529 struct list_head
* node
, * next
;
531 list_for_each_safe(node
, next
, &handler
->h_list
) {
532 struct input_handle
* handle
= to_handle_h(node
);
533 list_del_init(&handle
->h_node
);
534 list_del_init(&handle
->d_node
);
535 handler
->disconnect(handle
);
538 list_del_init(&handler
->node
);
540 if (handler
->fops
!= NULL
)
541 input_table
[handler
->minor
>> 5] = NULL
;
543 #ifdef CONFIG_PROC_FS
544 input_devices_state
++;
545 wake_up(&input_devices_poll_wait
);
549 static int input_open_file(struct inode
*inode
, struct file
*file
)
551 struct input_handler
*handler
= input_table
[iminor(inode
) >> 5];
552 struct file_operations
*old_fops
, *new_fops
= NULL
;
555 /* No load-on-demand here? */
556 if (!handler
|| !(new_fops
= fops_get(handler
->fops
)))
560 * That's _really_ odd. Usually NULL ->open means "nothing special",
561 * not "no device". Oh, well...
563 if (!new_fops
->open
) {
567 old_fops
= file
->f_op
;
568 file
->f_op
= new_fops
;
570 err
= new_fops
->open(inode
, file
);
573 fops_put(file
->f_op
);
574 file
->f_op
= fops_get(old_fops
);
580 static struct file_operations input_fops
= {
581 .owner
= THIS_MODULE
,
582 .open
= input_open_file
,
585 #ifdef CONFIG_PROC_FS
587 #define SPRINTF_BIT_B(bit, name, max) \
589 len += sprintf(buf + len, "B: %s", name); \
590 for (i = NBITS(max) - 1; i >= 0; i--) \
591 if (dev->bit[i]) break; \
592 for (; i >= 0; i--) \
593 len += sprintf(buf + len, "%lx ", dev->bit[i]); \
594 len += sprintf(buf + len, "\n"); \
597 #define SPRINTF_BIT_B2(bit, name, max, ev) \
599 if (test_bit(ev, dev->evbit)) \
600 SPRINTF_BIT_B(bit, name, max); \
604 static unsigned int input_devices_poll(struct file
*file
, poll_table
*wait
)
606 int state
= input_devices_state
;
607 poll_wait(file
, &input_devices_poll_wait
, wait
);
608 if (state
!= input_devices_state
)
609 return POLLIN
| POLLRDNORM
;
613 static int input_devices_read(char *buf
, char **start
, off_t pos
, int count
, int *eof
, void *data
)
615 struct input_dev
*dev
;
616 struct input_handle
*handle
;
621 list_for_each_entry(dev
, &input_dev_list
, node
) {
623 len
= sprintf(buf
, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
624 dev
->id
.bustype
, dev
->id
.vendor
, dev
->id
.product
, dev
->id
.version
);
626 len
+= sprintf(buf
+ len
, "N: Name=\"%s\"\n", dev
->name
? dev
->name
: "");
627 len
+= sprintf(buf
+ len
, "P: Phys=%s\n", dev
->phys
? dev
->phys
: "");
628 len
+= sprintf(buf
+ len
, "H: Handlers=");
630 list_for_each_entry(handle
, &dev
->h_list
, d_node
)
631 len
+= sprintf(buf
+ len
, "%s ", handle
->name
);
633 len
+= sprintf(buf
+ len
, "\n");
635 SPRINTF_BIT_B(evbit
, "EV=", EV_MAX
);
636 SPRINTF_BIT_B2(keybit
, "KEY=", KEY_MAX
, EV_KEY
);
637 SPRINTF_BIT_B2(relbit
, "REL=", REL_MAX
, EV_REL
);
638 SPRINTF_BIT_B2(absbit
, "ABS=", ABS_MAX
, EV_ABS
);
639 SPRINTF_BIT_B2(mscbit
, "MSC=", MSC_MAX
, EV_MSC
);
640 SPRINTF_BIT_B2(ledbit
, "LED=", LED_MAX
, EV_LED
);
641 SPRINTF_BIT_B2(sndbit
, "SND=", SND_MAX
, EV_SND
);
642 SPRINTF_BIT_B2(ffbit
, "FF=", FF_MAX
, EV_FF
);
644 len
+= sprintf(buf
+ len
, "\n");
650 *start
= buf
+ (pos
- (at
- len
));
659 if (&dev
->node
== &input_dev_list
)
662 return (count
> cnt
) ? cnt
: count
;
665 static int input_handlers_read(char *buf
, char **start
, off_t pos
, int count
, int *eof
, void *data
)
667 struct input_handler
*handler
;
670 int len
= 0, cnt
= 0;
673 list_for_each_entry(handler
, &input_handler_list
, node
) {
676 len
= sprintf(buf
, "N: Number=%d Name=%s Minor=%d\n",
677 i
++, handler
->name
, handler
->minor
);
679 len
= sprintf(buf
, "N: Number=%d Name=%s\n",
686 *start
= buf
+ (pos
- (at
- len
));
694 if (&handler
->node
== &input_handler_list
)
697 return (count
> cnt
) ? cnt
: count
;
700 static struct file_operations input_fileops
;
702 static int __init
input_proc_init(void)
704 struct proc_dir_entry
*entry
;
706 proc_bus_input_dir
= proc_mkdir("input", proc_bus
);
707 if (proc_bus_input_dir
== NULL
)
709 proc_bus_input_dir
->owner
= THIS_MODULE
;
710 entry
= create_proc_read_entry("devices", 0, proc_bus_input_dir
, input_devices_read
, NULL
);
712 remove_proc_entry("input", proc_bus
);
715 entry
->owner
= THIS_MODULE
;
716 input_fileops
= *entry
->proc_fops
;
717 entry
->proc_fops
= &input_fileops
;
718 entry
->proc_fops
->poll
= input_devices_poll
;
719 entry
= create_proc_read_entry("handlers", 0, proc_bus_input_dir
, input_handlers_read
, NULL
);
721 remove_proc_entry("devices", proc_bus_input_dir
);
722 remove_proc_entry("input", proc_bus
);
725 entry
->owner
= THIS_MODULE
;
728 #else /* !CONFIG_PROC_FS */
729 static inline int input_proc_init(void) { return 0; }
732 struct class *input_class
;
734 static int __init
input_init(void)
736 int retval
= -ENOMEM
;
738 input_class
= class_create(THIS_MODULE
, "input");
739 if (IS_ERR(input_class
))
740 return PTR_ERR(input_class
);
742 retval
= register_chrdev(INPUT_MAJOR
, "input", &input_fops
);
744 printk(KERN_ERR
"input: unable to register char major %d", INPUT_MAJOR
);
745 remove_proc_entry("devices", proc_bus_input_dir
);
746 remove_proc_entry("handlers", proc_bus_input_dir
);
747 remove_proc_entry("input", proc_bus
);
748 class_destroy(input_class
);
752 retval
= devfs_mk_dir("input");
754 remove_proc_entry("devices", proc_bus_input_dir
);
755 remove_proc_entry("handlers", proc_bus_input_dir
);
756 remove_proc_entry("input", proc_bus
);
757 unregister_chrdev(INPUT_MAJOR
, "input");
758 class_destroy(input_class
);
763 static void __exit
input_exit(void)
765 remove_proc_entry("devices", proc_bus_input_dir
);
766 remove_proc_entry("handlers", proc_bus_input_dir
);
767 remove_proc_entry("input", proc_bus
);
769 devfs_remove("input");
770 unregister_chrdev(INPUT_MAJOR
, "input");
771 class_destroy(input_class
);
774 subsys_initcall(input_init
);
775 module_exit(input_exit
);