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.
70 static void input_pass_event(struct input_dev *dev,
71 unsigned int type, unsigned int code, int value)
73 struct input_handle *handle;
77 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,
89 * Generate software autorepeat event. Note that we take
90 * dev->event_lock here to avoid racing with input_event
91 * which may cause keys get "stuck".
93 static void input_repeat_key(unsigned long data)
95 struct input_dev *dev = (void *) data;
98 spin_lock_irqsave(&dev->event_lock, flags);
100 if (test_bit(dev->repeat_key, dev->key) &&
101 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
103 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
107 * Only send SYN_REPORT if we are not in a middle
108 * of driver parsing a new hardware packet.
109 * Otherwise assume that the driver will send
110 * SYN_REPORT once it's done.
112 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
115 if (dev->rep[REP_PERIOD])
116 mod_timer(&dev->timer, jiffies +
117 msecs_to_jiffies(dev->rep[REP_PERIOD]));
120 spin_unlock_irqrestore(&dev->event_lock, flags);
123 static void input_start_autorepeat(struct input_dev *dev, int code)
125 if (test_bit(EV_REP, dev->evbit) &&
126 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
128 dev->repeat_key = code;
129 mod_timer(&dev->timer,
130 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
134 #define INPUT_IGNORE_EVENT 0
135 #define INPUT_PASS_TO_HANDLERS 1
136 #define INPUT_PASS_TO_DEVICE 2
137 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
139 static void input_handle_event(struct input_dev *dev,
140 unsigned int type, unsigned int code, int value)
142 int disposition = INPUT_IGNORE_EVENT;
149 disposition = INPUT_PASS_TO_ALL;
155 disposition = INPUT_PASS_TO_HANDLERS;
162 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
163 !!test_bit(code, dev->key) != value) {
166 __change_bit(code, dev->key);
168 input_start_autorepeat(dev, code);
171 disposition = INPUT_PASS_TO_HANDLERS;
176 if (is_event_supported(code, dev->swbit, SW_MAX) &&
177 !!test_bit(code, dev->sw) != value) {
179 __change_bit(code, dev->sw);
180 disposition = INPUT_PASS_TO_HANDLERS;
185 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
187 value = input_defuzz_abs_event(value,
188 dev->abs[code], dev->absfuzz[code]);
190 if (dev->abs[code] != value) {
191 dev->abs[code] = value;
192 disposition = INPUT_PASS_TO_HANDLERS;
198 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
199 disposition = INPUT_PASS_TO_HANDLERS;
204 if (is_event_supported(code, dev->mscbit, MSC_MAX))
205 disposition = INPUT_PASS_TO_ALL;
210 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
211 !!test_bit(code, dev->led) != value) {
213 __change_bit(code, dev->led);
214 disposition = INPUT_PASS_TO_ALL;
219 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
221 if (!!test_bit(code, dev->snd) != !!value)
222 __change_bit(code, dev->snd);
223 disposition = INPUT_PASS_TO_ALL;
228 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
229 dev->rep[code] = value;
230 disposition = INPUT_PASS_TO_ALL;
236 disposition = INPUT_PASS_TO_ALL;
243 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
244 dev->event(dev, type, code, value);
246 if (disposition & INPUT_PASS_TO_HANDLERS)
247 input_pass_event(dev, type, code, value);
251 * input_event() - report new input event
252 * @dev: device that generated the event
253 * @type: type of the event
255 * @value: value of the event
257 * This function should be used by drivers implementing various input
258 * devices. See also input_inject_event().
261 void input_event(struct input_dev *dev,
262 unsigned int type, unsigned int code, int value)
266 if (is_event_supported(type, dev->evbit, EV_MAX)) {
268 spin_lock_irqsave(&dev->event_lock, flags);
269 add_input_randomness(type, code, value);
270 input_handle_event(dev, type, code, value);
271 spin_unlock_irqrestore(&dev->event_lock, flags);
274 EXPORT_SYMBOL(input_event);
277 * input_inject_event() - send input event from input handler
278 * @handle: input handle to send event through
279 * @type: type of the event
281 * @value: value of the event
283 * Similar to input_event() but will ignore event if device is
284 * "grabbed" and handle injecting event is not the one that owns
287 void input_inject_event(struct input_handle *handle,
288 unsigned int type, unsigned int code, int value)
290 struct input_dev *dev = handle->dev;
291 struct input_handle *grab;
294 if (is_event_supported(type, dev->evbit, EV_MAX)) {
295 spin_lock_irqsave(&dev->event_lock, flags);
298 grab = rcu_dereference(dev->grab);
299 if (!grab || grab == handle)
300 input_handle_event(dev, type, code, value);
303 spin_unlock_irqrestore(&dev->event_lock, flags);
306 EXPORT_SYMBOL(input_inject_event);
309 * input_grab_device - grabs device for exclusive use
310 * @handle: input handle that wants to own the device
312 * When a device is grabbed by an input handle all events generated by
313 * the device are delivered only to this handle. Also events injected
314 * by other input handles are ignored while device is grabbed.
316 int input_grab_device(struct input_handle *handle)
318 struct input_dev *dev = handle->dev;
321 retval = mutex_lock_interruptible(&dev->mutex);
330 rcu_assign_pointer(dev->grab, handle);
334 mutex_unlock(&dev->mutex);
337 EXPORT_SYMBOL(input_grab_device);
339 static void __input_release_device(struct input_handle *handle)
341 struct input_dev *dev = handle->dev;
343 if (dev->grab == handle) {
344 rcu_assign_pointer(dev->grab, NULL);
345 /* Make sure input_pass_event() notices that grab is gone */
348 list_for_each_entry(handle, &dev->h_list, d_node)
349 if (handle->open && handle->handler->start)
350 handle->handler->start(handle);
355 * input_release_device - release previously grabbed device
356 * @handle: input handle that owns the device
358 * Releases previously grabbed device so that other input handles can
359 * start receiving input events. Upon release all handlers attached
360 * to the device have their start() method called so they have a change
361 * to synchronize device state with the rest of the system.
363 void input_release_device(struct input_handle *handle)
365 struct input_dev *dev = handle->dev;
367 mutex_lock(&dev->mutex);
368 __input_release_device(handle);
369 mutex_unlock(&dev->mutex);
371 EXPORT_SYMBOL(input_release_device);
374 * input_open_device - open input device
375 * @handle: handle through which device is being accessed
377 * This function should be called by input handlers when they
378 * want to start receive events from given input device.
380 int input_open_device(struct input_handle *handle)
382 struct input_dev *dev = handle->dev;
385 retval = mutex_lock_interruptible(&dev->mutex);
389 if (dev->going_away) {
396 if (!dev->users++ && dev->open)
397 retval = dev->open(dev);
401 if (!--handle->open) {
403 * Make sure we are not delivering any more events
404 * through this handle
411 mutex_unlock(&dev->mutex);
414 EXPORT_SYMBOL(input_open_device);
416 int input_flush_device(struct input_handle *handle, struct file *file)
418 struct input_dev *dev = handle->dev;
421 retval = mutex_lock_interruptible(&dev->mutex);
426 retval = dev->flush(dev, file);
428 mutex_unlock(&dev->mutex);
431 EXPORT_SYMBOL(input_flush_device);
434 * input_close_device - close input device
435 * @handle: handle through which device is being accessed
437 * This function should be called by input handlers when they
438 * want to stop receive events from given input device.
440 void input_close_device(struct input_handle *handle)
442 struct input_dev *dev = handle->dev;
444 mutex_lock(&dev->mutex);
446 __input_release_device(handle);
448 if (!--dev->users && dev->close)
451 if (!--handle->open) {
453 * synchronize_rcu() makes sure that input_pass_event()
454 * completed and that no more input events are delivered
455 * through this handle
460 mutex_unlock(&dev->mutex);
462 EXPORT_SYMBOL(input_close_device);
465 * Prepare device for unregistering
467 static void input_disconnect_device(struct input_dev *dev)
469 struct input_handle *handle;
473 * Mark device as going away. Note that we take dev->mutex here
474 * not to protect access to dev->going_away but rather to ensure
475 * that there are no threads in the middle of input_open_device()
477 mutex_lock(&dev->mutex);
479 mutex_unlock(&dev->mutex);
481 spin_lock_irq(&dev->event_lock);
484 * Simulate keyup events for all pressed keys so that handlers
485 * are not left with "stuck" keys. The driver may continue
486 * generate events even after we done here but they will not
487 * reach any handlers.
489 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
490 for (code = 0; code <= KEY_MAX; code++) {
491 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
492 test_bit(code, dev->key)) {
493 input_pass_event(dev, EV_KEY, code, 0);
496 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
499 list_for_each_entry(handle, &dev->h_list, d_node)
502 spin_unlock_irq(&dev->event_lock);
505 static int input_fetch_keycode(struct input_dev *dev, int scancode)
507 switch (dev->keycodesize) {
509 return ((u8 *)dev->keycode)[scancode];
512 return ((u16 *)dev->keycode)[scancode];
515 return ((u32 *)dev->keycode)[scancode];
519 static int input_default_getkeycode(struct input_dev *dev,
520 int scancode, int *keycode)
522 if (!dev->keycodesize)
525 if (scancode < 0 || scancode >= dev->keycodemax)
528 *keycode = input_fetch_keycode(dev, scancode);
533 static int input_default_setkeycode(struct input_dev *dev,
534 int scancode, int keycode)
539 if (scancode < 0 || scancode >= dev->keycodemax)
542 if (keycode < 0 || keycode > KEY_MAX)
545 if (!dev->keycodesize)
548 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
551 switch (dev->keycodesize) {
553 u8 *k = (u8 *)dev->keycode;
554 old_keycode = k[scancode];
555 k[scancode] = keycode;
559 u16 *k = (u16 *)dev->keycode;
560 old_keycode = k[scancode];
561 k[scancode] = keycode;
565 u32 *k = (u32 *)dev->keycode;
566 old_keycode = k[scancode];
567 k[scancode] = keycode;
572 clear_bit(old_keycode, dev->keybit);
573 set_bit(keycode, dev->keybit);
575 for (i = 0; i < dev->keycodemax; i++) {
576 if (input_fetch_keycode(dev, i) == old_keycode) {
577 set_bit(old_keycode, dev->keybit);
578 break; /* Setting the bit twice is useless, so break */
586 #define MATCH_BIT(bit, max) \
587 for (i = 0; i < NBITS(max); i++) \
588 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
590 if (i != NBITS(max)) \
593 static const struct input_device_id *input_match_device(const struct input_device_id *id,
594 struct input_dev *dev)
598 for (; id->flags || id->driver_info; id++) {
600 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
601 if (id->bustype != dev->id.bustype)
604 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
605 if (id->vendor != dev->id.vendor)
608 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
609 if (id->product != dev->id.product)
612 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
613 if (id->version != dev->id.version)
616 MATCH_BIT(evbit, EV_MAX);
617 MATCH_BIT(keybit, KEY_MAX);
618 MATCH_BIT(relbit, REL_MAX);
619 MATCH_BIT(absbit, ABS_MAX);
620 MATCH_BIT(mscbit, MSC_MAX);
621 MATCH_BIT(ledbit, LED_MAX);
622 MATCH_BIT(sndbit, SND_MAX);
623 MATCH_BIT(ffbit, FF_MAX);
624 MATCH_BIT(swbit, SW_MAX);
632 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
634 const struct input_device_id *id;
637 if (handler->blacklist && input_match_device(handler->blacklist, dev))
640 id = input_match_device(handler->id_table, dev);
644 error = handler->connect(handler, dev, id);
645 if (error && error != -ENODEV)
647 "input: failed to attach handler %s to device %s, "
649 handler->name, kobject_name(&dev->dev.kobj), error);
655 #ifdef CONFIG_PROC_FS
657 static struct proc_dir_entry *proc_bus_input_dir;
658 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
659 static int input_devices_state;
661 static inline void input_wakeup_procfs_readers(void)
663 input_devices_state++;
664 wake_up(&input_devices_poll_wait);
667 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
669 int state = input_devices_state;
671 poll_wait(file, &input_devices_poll_wait, wait);
672 if (state != input_devices_state)
673 return POLLIN | POLLRDNORM;
678 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
680 if (mutex_lock_interruptible(&input_mutex))
683 return seq_list_start(&input_dev_list, *pos);
686 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
688 return seq_list_next(v, &input_dev_list, pos);
691 static void input_devices_seq_stop(struct seq_file *seq, void *v)
693 mutex_unlock(&input_mutex);
696 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
697 unsigned long *bitmap, int max)
701 for (i = NBITS(max) - 1; i > 0; i--)
705 seq_printf(seq, "B: %s=", name);
707 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
711 static int input_devices_seq_show(struct seq_file *seq, void *v)
713 struct input_dev *dev = container_of(v, struct input_dev, node);
714 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
715 struct input_handle *handle;
717 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
718 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
720 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
721 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
722 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
723 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
724 seq_printf(seq, "H: Handlers=");
726 list_for_each_entry(handle, &dev->h_list, d_node)
727 seq_printf(seq, "%s ", handle->name);
730 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
731 if (test_bit(EV_KEY, dev->evbit))
732 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
733 if (test_bit(EV_REL, dev->evbit))
734 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
735 if (test_bit(EV_ABS, dev->evbit))
736 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
737 if (test_bit(EV_MSC, dev->evbit))
738 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
739 if (test_bit(EV_LED, dev->evbit))
740 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
741 if (test_bit(EV_SND, dev->evbit))
742 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
743 if (test_bit(EV_FF, dev->evbit))
744 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
745 if (test_bit(EV_SW, dev->evbit))
746 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
754 static struct seq_operations input_devices_seq_ops = {
755 .start = input_devices_seq_start,
756 .next = input_devices_seq_next,
757 .stop = input_devices_seq_stop,
758 .show = input_devices_seq_show,
761 static int input_proc_devices_open(struct inode *inode, struct file *file)
763 return seq_open(file, &input_devices_seq_ops);
766 static const struct file_operations input_devices_fileops = {
767 .owner = THIS_MODULE,
768 .open = input_proc_devices_open,
769 .poll = input_proc_devices_poll,
772 .release = seq_release,
775 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
777 if (mutex_lock_interruptible(&input_mutex))
780 seq->private = (void *)(unsigned long)*pos;
781 return seq_list_start(&input_handler_list, *pos);
784 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
786 seq->private = (void *)(unsigned long)(*pos + 1);
787 return seq_list_next(v, &input_handler_list, pos);
790 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
792 mutex_unlock(&input_mutex);
795 static int input_handlers_seq_show(struct seq_file *seq, void *v)
797 struct input_handler *handler = container_of(v, struct input_handler, node);
799 seq_printf(seq, "N: Number=%ld Name=%s",
800 (unsigned long)seq->private, handler->name);
802 seq_printf(seq, " Minor=%d", handler->minor);
807 static struct seq_operations input_handlers_seq_ops = {
808 .start = input_handlers_seq_start,
809 .next = input_handlers_seq_next,
810 .stop = input_handlers_seq_stop,
811 .show = input_handlers_seq_show,
814 static int input_proc_handlers_open(struct inode *inode, struct file *file)
816 return seq_open(file, &input_handlers_seq_ops);
819 static const struct file_operations input_handlers_fileops = {
820 .owner = THIS_MODULE,
821 .open = input_proc_handlers_open,
824 .release = seq_release,
827 static int __init input_proc_init(void)
829 struct proc_dir_entry *entry;
831 proc_bus_input_dir = proc_mkdir("input", proc_bus);
832 if (!proc_bus_input_dir)
835 proc_bus_input_dir->owner = THIS_MODULE;
837 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
841 entry->owner = THIS_MODULE;
842 entry->proc_fops = &input_devices_fileops;
844 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
848 entry->owner = THIS_MODULE;
849 entry->proc_fops = &input_handlers_fileops;
853 fail2: remove_proc_entry("devices", proc_bus_input_dir);
854 fail1: remove_proc_entry("input", proc_bus);
858 static void input_proc_exit(void)
860 remove_proc_entry("devices", proc_bus_input_dir);
861 remove_proc_entry("handlers", proc_bus_input_dir);
862 remove_proc_entry("input", proc_bus);
865 #else /* !CONFIG_PROC_FS */
866 static inline void input_wakeup_procfs_readers(void) { }
867 static inline int input_proc_init(void) { return 0; }
868 static inline void input_proc_exit(void) { }
871 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
872 static ssize_t input_dev_show_##name(struct device *dev, \
873 struct device_attribute *attr, \
876 struct input_dev *input_dev = to_input_dev(dev); \
878 return scnprintf(buf, PAGE_SIZE, "%s\n", \
879 input_dev->name ? input_dev->name : ""); \
881 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
883 INPUT_DEV_STRING_ATTR_SHOW(name);
884 INPUT_DEV_STRING_ATTR_SHOW(phys);
885 INPUT_DEV_STRING_ATTR_SHOW(uniq);
887 static int input_print_modalias_bits(char *buf, int size,
888 char name, unsigned long *bm,
889 unsigned int min_bit, unsigned int max_bit)
893 len += snprintf(buf, max(size, 0), "%c", name);
894 for (i = min_bit; i < max_bit; i++)
895 if (bm[LONG(i)] & BIT(i))
896 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
900 static int input_print_modalias(char *buf, int size, struct input_dev *id,
905 len = snprintf(buf, max(size, 0),
906 "input:b%04Xv%04Xp%04Xe%04X-",
907 id->id.bustype, id->id.vendor,
908 id->id.product, id->id.version);
910 len += input_print_modalias_bits(buf + len, size - len,
911 'e', id->evbit, 0, EV_MAX);
912 len += input_print_modalias_bits(buf + len, size - len,
913 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
914 len += input_print_modalias_bits(buf + len, size - len,
915 'r', id->relbit, 0, REL_MAX);
916 len += input_print_modalias_bits(buf + len, size - len,
917 'a', id->absbit, 0, ABS_MAX);
918 len += input_print_modalias_bits(buf + len, size - len,
919 'm', id->mscbit, 0, MSC_MAX);
920 len += input_print_modalias_bits(buf + len, size - len,
921 'l', id->ledbit, 0, LED_MAX);
922 len += input_print_modalias_bits(buf + len, size - len,
923 's', id->sndbit, 0, SND_MAX);
924 len += input_print_modalias_bits(buf + len, size - len,
925 'f', id->ffbit, 0, FF_MAX);
926 len += input_print_modalias_bits(buf + len, size - len,
927 'w', id->swbit, 0, SW_MAX);
930 len += snprintf(buf + len, max(size - len, 0), "\n");
935 static ssize_t input_dev_show_modalias(struct device *dev,
936 struct device_attribute *attr,
939 struct input_dev *id = to_input_dev(dev);
942 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
944 return min_t(int, len, PAGE_SIZE);
946 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
948 static struct attribute *input_dev_attrs[] = {
952 &dev_attr_modalias.attr,
956 static struct attribute_group input_dev_attr_group = {
957 .attrs = input_dev_attrs,
960 #define INPUT_DEV_ID_ATTR(name) \
961 static ssize_t input_dev_show_id_##name(struct device *dev, \
962 struct device_attribute *attr, \
965 struct input_dev *input_dev = to_input_dev(dev); \
966 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
968 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
970 INPUT_DEV_ID_ATTR(bustype);
971 INPUT_DEV_ID_ATTR(vendor);
972 INPUT_DEV_ID_ATTR(product);
973 INPUT_DEV_ID_ATTR(version);
975 static struct attribute *input_dev_id_attrs[] = {
976 &dev_attr_bustype.attr,
977 &dev_attr_vendor.attr,
978 &dev_attr_product.attr,
979 &dev_attr_version.attr,
983 static struct attribute_group input_dev_id_attr_group = {
985 .attrs = input_dev_id_attrs,
988 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
994 for (i = NBITS(max) - 1; i > 0; i--)
999 len += snprintf(buf + len, max(buf_size - len, 0),
1000 "%lx%s", bitmap[i], i > 0 ? " " : "");
1003 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1008 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1009 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1010 struct device_attribute *attr, \
1013 struct input_dev *input_dev = to_input_dev(dev); \
1014 int len = input_print_bitmap(buf, PAGE_SIZE, \
1015 input_dev->bm##bit, ev##_MAX, 1); \
1016 return min_t(int, len, PAGE_SIZE); \
1018 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1020 INPUT_DEV_CAP_ATTR(EV, ev);
1021 INPUT_DEV_CAP_ATTR(KEY, key);
1022 INPUT_DEV_CAP_ATTR(REL, rel);
1023 INPUT_DEV_CAP_ATTR(ABS, abs);
1024 INPUT_DEV_CAP_ATTR(MSC, msc);
1025 INPUT_DEV_CAP_ATTR(LED, led);
1026 INPUT_DEV_CAP_ATTR(SND, snd);
1027 INPUT_DEV_CAP_ATTR(FF, ff);
1028 INPUT_DEV_CAP_ATTR(SW, sw);
1030 static struct attribute *input_dev_caps_attrs[] = {
1043 static struct attribute_group input_dev_caps_attr_group = {
1044 .name = "capabilities",
1045 .attrs = input_dev_caps_attrs,
1048 static struct attribute_group *input_dev_attr_groups[] = {
1049 &input_dev_attr_group,
1050 &input_dev_id_attr_group,
1051 &input_dev_caps_attr_group,
1055 static void input_dev_release(struct device *device)
1057 struct input_dev *dev = to_input_dev(device);
1059 input_ff_destroy(dev);
1062 module_put(THIS_MODULE);
1066 * Input uevent interface - loading event handlers based on
1069 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1070 const char *name, unsigned long *bitmap, int max)
1074 if (add_uevent_var(env, "%s=", name))
1077 len = input_print_bitmap(&env->buf[env->buflen - 1],
1078 sizeof(env->buf) - env->buflen,
1080 if (len >= (sizeof(env->buf) - env->buflen))
1087 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1088 struct input_dev *dev)
1092 if (add_uevent_var(env, "MODALIAS="))
1095 len = input_print_modalias(&env->buf[env->buflen - 1],
1096 sizeof(env->buf) - env->buflen,
1098 if (len >= (sizeof(env->buf) - env->buflen))
1105 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1107 int err = add_uevent_var(env, fmt, val); \
1112 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1114 int err = input_add_uevent_bm_var(env, name, bm, max); \
1119 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1121 int err = input_add_uevent_modalias_var(env, dev); \
1126 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1128 struct input_dev *dev = to_input_dev(device);
1130 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1131 dev->id.bustype, dev->id.vendor,
1132 dev->id.product, dev->id.version);
1134 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1136 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1138 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1140 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1141 if (test_bit(EV_KEY, dev->evbit))
1142 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1143 if (test_bit(EV_REL, dev->evbit))
1144 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1145 if (test_bit(EV_ABS, dev->evbit))
1146 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1147 if (test_bit(EV_MSC, dev->evbit))
1148 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1149 if (test_bit(EV_LED, dev->evbit))
1150 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1151 if (test_bit(EV_SND, dev->evbit))
1152 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1153 if (test_bit(EV_FF, dev->evbit))
1154 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1155 if (test_bit(EV_SW, dev->evbit))
1156 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1158 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1163 static struct device_type input_dev_type = {
1164 .groups = input_dev_attr_groups,
1165 .release = input_dev_release,
1166 .uevent = input_dev_uevent,
1169 struct class input_class = {
1172 EXPORT_SYMBOL_GPL(input_class);
1175 * input_allocate_device - allocate memory for new input device
1177 * Returns prepared struct input_dev or NULL.
1179 * NOTE: Use input_free_device() to free devices that have not been
1180 * registered; input_unregister_device() should be used for already
1181 * registered devices.
1183 struct input_dev *input_allocate_device(void)
1185 struct input_dev *dev;
1187 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1189 dev->dev.type = &input_dev_type;
1190 dev->dev.class = &input_class;
1191 device_initialize(&dev->dev);
1192 mutex_init(&dev->mutex);
1193 spin_lock_init(&dev->event_lock);
1194 INIT_LIST_HEAD(&dev->h_list);
1195 INIT_LIST_HEAD(&dev->node);
1197 __module_get(THIS_MODULE);
1202 EXPORT_SYMBOL(input_allocate_device);
1205 * input_free_device - free memory occupied by input_dev structure
1206 * @dev: input device to free
1208 * This function should only be used if input_register_device()
1209 * was not called yet or if it failed. Once device was registered
1210 * use input_unregister_device() and memory will be freed once last
1211 * reference to the device is dropped.
1213 * Device should be allocated by input_allocate_device().
1215 * NOTE: If there are references to the input device then memory
1216 * will not be freed until last reference is dropped.
1218 void input_free_device(struct input_dev *dev)
1221 input_put_device(dev);
1223 EXPORT_SYMBOL(input_free_device);
1226 * input_set_capability - mark device as capable of a certain event
1227 * @dev: device that is capable of emitting or accepting event
1228 * @type: type of the event (EV_KEY, EV_REL, etc...)
1231 * In addition to setting up corresponding bit in appropriate capability
1232 * bitmap the function also adjusts dev->evbit.
1234 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1238 __set_bit(code, dev->keybit);
1242 __set_bit(code, dev->relbit);
1246 __set_bit(code, dev->absbit);
1250 __set_bit(code, dev->mscbit);
1254 __set_bit(code, dev->swbit);
1258 __set_bit(code, dev->ledbit);
1262 __set_bit(code, dev->sndbit);
1266 __set_bit(code, dev->ffbit);
1271 "input_set_capability: unknown type %u (code %u)\n",
1277 __set_bit(type, dev->evbit);
1279 EXPORT_SYMBOL(input_set_capability);
1282 * input_register_device - register device with input core
1283 * @dev: device to be registered
1285 * This function registers device with input core. The device must be
1286 * allocated with input_allocate_device() and all it's capabilities
1287 * set up before registering.
1288 * If function fails the device must be freed with input_free_device().
1289 * Once device has been successfully registered it can be unregistered
1290 * with input_unregister_device(); input_free_device() should not be
1291 * called in this case.
1293 int input_register_device(struct input_dev *dev)
1295 static atomic_t input_no = ATOMIC_INIT(0);
1296 struct input_handler *handler;
1300 __set_bit(EV_SYN, dev->evbit);
1303 * If delay and period are pre-set by the driver, then autorepeating
1304 * is handled by the driver itself and we don't do it in input.c.
1307 init_timer(&dev->timer);
1308 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1309 dev->timer.data = (long) dev;
1310 dev->timer.function = input_repeat_key;
1311 dev->rep[REP_DELAY] = 250;
1312 dev->rep[REP_PERIOD] = 33;
1315 if (!dev->getkeycode)
1316 dev->getkeycode = input_default_getkeycode;
1318 if (!dev->setkeycode)
1319 dev->setkeycode = input_default_setkeycode;
1321 snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
1322 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1325 dev->dev.parent = dev->cdev.dev;
1327 error = device_add(&dev->dev);
1331 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1332 printk(KERN_INFO "input: %s as %s\n",
1333 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1336 error = mutex_lock_interruptible(&input_mutex);
1338 device_del(&dev->dev);
1342 list_add_tail(&dev->node, &input_dev_list);
1344 list_for_each_entry(handler, &input_handler_list, node)
1345 input_attach_handler(dev, handler);
1347 input_wakeup_procfs_readers();
1349 mutex_unlock(&input_mutex);
1353 EXPORT_SYMBOL(input_register_device);
1356 * input_unregister_device - unregister previously registered device
1357 * @dev: device to be unregistered
1359 * This function unregisters an input device. Once device is unregistered
1360 * the caller should not try to access it as it may get freed at any moment.
1362 void input_unregister_device(struct input_dev *dev)
1364 struct input_handle *handle, *next;
1366 input_disconnect_device(dev);
1368 mutex_lock(&input_mutex);
1370 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1371 handle->handler->disconnect(handle);
1372 WARN_ON(!list_empty(&dev->h_list));
1374 del_timer_sync(&dev->timer);
1375 list_del_init(&dev->node);
1377 input_wakeup_procfs_readers();
1379 mutex_unlock(&input_mutex);
1381 device_unregister(&dev->dev);
1383 EXPORT_SYMBOL(input_unregister_device);
1386 * input_register_handler - register a new input handler
1387 * @handler: handler to be registered
1389 * This function registers a new input handler (interface) for input
1390 * devices in the system and attaches it to all input devices that
1391 * are compatible with the handler.
1393 int input_register_handler(struct input_handler *handler)
1395 struct input_dev *dev;
1398 retval = mutex_lock_interruptible(&input_mutex);
1402 INIT_LIST_HEAD(&handler->h_list);
1404 if (handler->fops != NULL) {
1405 if (input_table[handler->minor >> 5]) {
1409 input_table[handler->minor >> 5] = handler;
1412 list_add_tail(&handler->node, &input_handler_list);
1414 list_for_each_entry(dev, &input_dev_list, node)
1415 input_attach_handler(dev, handler);
1417 input_wakeup_procfs_readers();
1420 mutex_unlock(&input_mutex);
1423 EXPORT_SYMBOL(input_register_handler);
1426 * input_unregister_handler - unregisters an input handler
1427 * @handler: handler to be unregistered
1429 * This function disconnects a handler from its input devices and
1430 * removes it from lists of known handlers.
1432 void input_unregister_handler(struct input_handler *handler)
1434 struct input_handle *handle, *next;
1436 mutex_lock(&input_mutex);
1438 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1439 handler->disconnect(handle);
1440 WARN_ON(!list_empty(&handler->h_list));
1442 list_del_init(&handler->node);
1444 if (handler->fops != NULL)
1445 input_table[handler->minor >> 5] = NULL;
1447 input_wakeup_procfs_readers();
1449 mutex_unlock(&input_mutex);
1451 EXPORT_SYMBOL(input_unregister_handler);
1454 * input_register_handle - register a new input handle
1455 * @handle: handle to register
1457 * This function puts a new input handle onto device's
1458 * and handler's lists so that events can flow through
1459 * it once it is opened using input_open_device().
1461 * This function is supposed to be called from handler's
1464 int input_register_handle(struct input_handle *handle)
1466 struct input_handler *handler = handle->handler;
1467 struct input_dev *dev = handle->dev;
1471 * We take dev->mutex here to prevent race with
1472 * input_release_device().
1474 error = mutex_lock_interruptible(&dev->mutex);
1477 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1478 mutex_unlock(&dev->mutex);
1482 * Since we are supposed to be called from ->connect()
1483 * which is mutually exclusive with ->disconnect()
1484 * we can't be racing with input_unregister_handle()
1485 * and so separate lock is not needed here.
1487 list_add_tail(&handle->h_node, &handler->h_list);
1490 handler->start(handle);
1494 EXPORT_SYMBOL(input_register_handle);
1497 * input_unregister_handle - unregister an input handle
1498 * @handle: handle to unregister
1500 * This function removes input handle from device's
1501 * and handler's lists.
1503 * This function is supposed to be called from handler's
1504 * disconnect() method.
1506 void input_unregister_handle(struct input_handle *handle)
1508 struct input_dev *dev = handle->dev;
1510 list_del_init(&handle->h_node);
1513 * Take dev->mutex to prevent race with input_release_device().
1515 mutex_lock(&dev->mutex);
1516 list_del_rcu(&handle->d_node);
1517 mutex_unlock(&dev->mutex);
1520 EXPORT_SYMBOL(input_unregister_handle);
1522 static int input_open_file(struct inode *inode, struct file *file)
1524 struct input_handler *handler = input_table[iminor(inode) >> 5];
1525 const struct file_operations *old_fops, *new_fops = NULL;
1528 /* No load-on-demand here? */
1529 if (!handler || !(new_fops = fops_get(handler->fops)))
1533 * That's _really_ odd. Usually NULL ->open means "nothing special",
1534 * not "no device". Oh, well...
1536 if (!new_fops->open) {
1540 old_fops = file->f_op;
1541 file->f_op = new_fops;
1543 err = new_fops->open(inode, file);
1546 fops_put(file->f_op);
1547 file->f_op = fops_get(old_fops);
1553 static const struct file_operations input_fops = {
1554 .owner = THIS_MODULE,
1555 .open = input_open_file,
1558 static int __init input_init(void)
1562 err = class_register(&input_class);
1564 printk(KERN_ERR "input: unable to register input_dev class\n");
1568 err = input_proc_init();
1572 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1574 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1580 fail2: input_proc_exit();
1581 fail1: class_unregister(&input_class);
1585 static void __exit input_exit(void)
1588 unregister_chrdev(INPUT_MAJOR, "input");
1589 class_unregister(&input_class);
1592 subsys_initcall(input_init);
1593 module_exit(input_exit);