4 * Copyright (c) 1999-2002 Vojtech Pavlik
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/input.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/random.h>
19 #include <linux/major.h>
20 #include <linux/proc_fs.h>
21 #include <linux/sched.h>
22 #include <linux/seq_file.h>
23 #include <linux/poll.h>
24 #include <linux/device.h>
25 #include <linux/mutex.h>
26 #include <linux/rcupdate.h>
27 #include <linux/smp_lock.h>
28 #include "input-compat.h"
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
31 MODULE_DESCRIPTION("Input core");
32 MODULE_LICENSE("GPL");
34 #define INPUT_DEVICES 256
36 static LIST_HEAD(input_dev_list);
37 static LIST_HEAD(input_handler_list);
40 * input_mutex protects access to both input_dev_list and input_handler_list.
41 * This also causes input_[un]register_device and input_[un]register_handler
42 * be mutually exclusive which simplifies locking in drivers implementing
45 static DEFINE_MUTEX(input_mutex);
47 static struct input_handler *input_table[8];
49 static inline int is_event_supported(unsigned int code,
50 unsigned long *bm, unsigned int max)
52 return code <= max && test_bit(code, bm);
55 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
58 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
61 if (value > old_val - fuzz && value < old_val + fuzz)
62 return (old_val * 3 + value) / 4;
64 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
65 return (old_val + value) / 2;
72 * Pass event first through all filters and then, if event has not been
73 * filtered out, through all open handles. This function is called with
74 * dev->event_lock held and interrupts disabled.
76 static void input_pass_event(struct input_dev *dev,
77 unsigned int type, unsigned int code, int value)
79 struct input_handler *handler;
80 struct input_handle *handle;
84 handle = rcu_dereference(dev->grab);
86 handle->handler->event(handle, type, code, value);
88 bool filtered = false;
90 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
94 handler = handle->handler;
95 if (!handler->filter) {
99 handler->event(handle, type, code, value);
101 } else if (handler->filter(handle, type, code, value))
110 * Generate software autorepeat event. Note that we take
111 * dev->event_lock here to avoid racing with input_event
112 * which may cause keys get "stuck".
114 static void input_repeat_key(unsigned long data)
116 struct input_dev *dev = (void *) data;
119 spin_lock_irqsave(&dev->event_lock, flags);
121 if (test_bit(dev->repeat_key, dev->key) &&
122 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
124 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
128 * Only send SYN_REPORT if we are not in a middle
129 * of driver parsing a new hardware packet.
130 * Otherwise assume that the driver will send
131 * SYN_REPORT once it's done.
133 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
136 if (dev->rep[REP_PERIOD])
137 mod_timer(&dev->timer, jiffies +
138 msecs_to_jiffies(dev->rep[REP_PERIOD]));
141 spin_unlock_irqrestore(&dev->event_lock, flags);
144 static void input_start_autorepeat(struct input_dev *dev, int code)
146 if (test_bit(EV_REP, dev->evbit) &&
147 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
149 dev->repeat_key = code;
150 mod_timer(&dev->timer,
151 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
155 static void input_stop_autorepeat(struct input_dev *dev)
157 del_timer(&dev->timer);
160 #define INPUT_IGNORE_EVENT 0
161 #define INPUT_PASS_TO_HANDLERS 1
162 #define INPUT_PASS_TO_DEVICE 2
163 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
165 static int input_handle_abs_event(struct input_dev *dev,
166 unsigned int code, int *pval)
171 if (code == ABS_MT_SLOT) {
173 * "Stage" the event; we'll flush it later, when we
174 * get actiual touch data.
176 if (*pval >= 0 && *pval < dev->mtsize)
179 return INPUT_IGNORE_EVENT;
182 is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST;
185 pold = &dev->abs[code];
186 } else if (dev->mt) {
187 struct input_mt_slot *mtslot = &dev->mt[dev->slot];
188 pold = &mtslot->abs[code - ABS_MT_FIRST];
191 * Bypass filtering for multitouch events when
192 * not employing slots.
198 *pval = input_defuzz_abs_event(*pval, *pold,
201 return INPUT_IGNORE_EVENT;
206 /* Flush pending "slot" event */
207 if (is_mt_event && dev->slot != dev->abs[ABS_MT_SLOT]) {
208 dev->abs[ABS_MT_SLOT] = dev->slot;
209 input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot);
212 return INPUT_PASS_TO_HANDLERS;
215 static void input_handle_event(struct input_dev *dev,
216 unsigned int type, unsigned int code, int value)
218 int disposition = INPUT_IGNORE_EVENT;
225 disposition = INPUT_PASS_TO_ALL;
231 disposition = INPUT_PASS_TO_HANDLERS;
236 disposition = INPUT_PASS_TO_HANDLERS;
242 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
243 !!test_bit(code, dev->key) != value) {
246 __change_bit(code, dev->key);
248 input_start_autorepeat(dev, code);
250 input_stop_autorepeat(dev);
253 disposition = INPUT_PASS_TO_HANDLERS;
258 if (is_event_supported(code, dev->swbit, SW_MAX) &&
259 !!test_bit(code, dev->sw) != value) {
261 __change_bit(code, dev->sw);
262 disposition = INPUT_PASS_TO_HANDLERS;
267 if (is_event_supported(code, dev->absbit, ABS_MAX))
268 disposition = input_handle_abs_event(dev, code, &value);
273 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
274 disposition = INPUT_PASS_TO_HANDLERS;
279 if (is_event_supported(code, dev->mscbit, MSC_MAX))
280 disposition = INPUT_PASS_TO_ALL;
285 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
286 !!test_bit(code, dev->led) != value) {
288 __change_bit(code, dev->led);
289 disposition = INPUT_PASS_TO_ALL;
294 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
296 if (!!test_bit(code, dev->snd) != !!value)
297 __change_bit(code, dev->snd);
298 disposition = INPUT_PASS_TO_ALL;
303 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
304 dev->rep[code] = value;
305 disposition = INPUT_PASS_TO_ALL;
311 disposition = INPUT_PASS_TO_ALL;
315 disposition = INPUT_PASS_TO_ALL;
319 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
322 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
323 dev->event(dev, type, code, value);
325 if (disposition & INPUT_PASS_TO_HANDLERS)
326 input_pass_event(dev, type, code, value);
330 * input_event() - report new input event
331 * @dev: device that generated the event
332 * @type: type of the event
334 * @value: value of the event
336 * This function should be used by drivers implementing various input
337 * devices to report input events. See also input_inject_event().
339 * NOTE: input_event() may be safely used right after input device was
340 * allocated with input_allocate_device(), even before it is registered
341 * with input_register_device(), but the event will not reach any of the
342 * input handlers. Such early invocation of input_event() may be used
343 * to 'seed' initial state of a switch or initial position of absolute
346 void input_event(struct input_dev *dev,
347 unsigned int type, unsigned int code, int value)
351 if (is_event_supported(type, dev->evbit, EV_MAX)) {
353 spin_lock_irqsave(&dev->event_lock, flags);
354 add_input_randomness(type, code, value);
355 input_handle_event(dev, type, code, value);
356 spin_unlock_irqrestore(&dev->event_lock, flags);
359 EXPORT_SYMBOL(input_event);
362 * input_inject_event() - send input event from input handler
363 * @handle: input handle to send event through
364 * @type: type of the event
366 * @value: value of the event
368 * Similar to input_event() but will ignore event if device is
369 * "grabbed" and handle injecting event is not the one that owns
372 void input_inject_event(struct input_handle *handle,
373 unsigned int type, unsigned int code, int value)
375 struct input_dev *dev = handle->dev;
376 struct input_handle *grab;
379 if (is_event_supported(type, dev->evbit, EV_MAX)) {
380 spin_lock_irqsave(&dev->event_lock, flags);
383 grab = rcu_dereference(dev->grab);
384 if (!grab || grab == handle)
385 input_handle_event(dev, type, code, value);
388 spin_unlock_irqrestore(&dev->event_lock, flags);
391 EXPORT_SYMBOL(input_inject_event);
394 * input_grab_device - grabs device for exclusive use
395 * @handle: input handle that wants to own the device
397 * When a device is grabbed by an input handle all events generated by
398 * the device are delivered only to this handle. Also events injected
399 * by other input handles are ignored while device is grabbed.
401 int input_grab_device(struct input_handle *handle)
403 struct input_dev *dev = handle->dev;
406 retval = mutex_lock_interruptible(&dev->mutex);
415 rcu_assign_pointer(dev->grab, handle);
419 mutex_unlock(&dev->mutex);
422 EXPORT_SYMBOL(input_grab_device);
424 static void __input_release_device(struct input_handle *handle)
426 struct input_dev *dev = handle->dev;
428 if (dev->grab == handle) {
429 rcu_assign_pointer(dev->grab, NULL);
430 /* Make sure input_pass_event() notices that grab is gone */
433 list_for_each_entry(handle, &dev->h_list, d_node)
434 if (handle->open && handle->handler->start)
435 handle->handler->start(handle);
440 * input_release_device - release previously grabbed device
441 * @handle: input handle that owns the device
443 * Releases previously grabbed device so that other input handles can
444 * start receiving input events. Upon release all handlers attached
445 * to the device have their start() method called so they have a change
446 * to synchronize device state with the rest of the system.
448 void input_release_device(struct input_handle *handle)
450 struct input_dev *dev = handle->dev;
452 mutex_lock(&dev->mutex);
453 __input_release_device(handle);
454 mutex_unlock(&dev->mutex);
456 EXPORT_SYMBOL(input_release_device);
459 * input_open_device - open input device
460 * @handle: handle through which device is being accessed
462 * This function should be called by input handlers when they
463 * want to start receive events from given input device.
465 int input_open_device(struct input_handle *handle)
467 struct input_dev *dev = handle->dev;
470 retval = mutex_lock_interruptible(&dev->mutex);
474 if (dev->going_away) {
481 if (!dev->users++ && dev->open)
482 retval = dev->open(dev);
486 if (!--handle->open) {
488 * Make sure we are not delivering any more events
489 * through this handle
496 mutex_unlock(&dev->mutex);
499 EXPORT_SYMBOL(input_open_device);
501 int input_flush_device(struct input_handle *handle, struct file *file)
503 struct input_dev *dev = handle->dev;
506 retval = mutex_lock_interruptible(&dev->mutex);
511 retval = dev->flush(dev, file);
513 mutex_unlock(&dev->mutex);
516 EXPORT_SYMBOL(input_flush_device);
519 * input_close_device - close input device
520 * @handle: handle through which device is being accessed
522 * This function should be called by input handlers when they
523 * want to stop receive events from given input device.
525 void input_close_device(struct input_handle *handle)
527 struct input_dev *dev = handle->dev;
529 mutex_lock(&dev->mutex);
531 __input_release_device(handle);
533 if (!--dev->users && dev->close)
536 if (!--handle->open) {
538 * synchronize_rcu() makes sure that input_pass_event()
539 * completed and that no more input events are delivered
540 * through this handle
545 mutex_unlock(&dev->mutex);
547 EXPORT_SYMBOL(input_close_device);
550 * Simulate keyup events for all keys that are marked as pressed.
551 * The function must be called with dev->event_lock held.
553 static void input_dev_release_keys(struct input_dev *dev)
557 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
558 for (code = 0; code <= KEY_MAX; code++) {
559 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
560 __test_and_clear_bit(code, dev->key)) {
561 input_pass_event(dev, EV_KEY, code, 0);
564 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
569 * Prepare device for unregistering
571 static void input_disconnect_device(struct input_dev *dev)
573 struct input_handle *handle;
576 * Mark device as going away. Note that we take dev->mutex here
577 * not to protect access to dev->going_away but rather to ensure
578 * that there are no threads in the middle of input_open_device()
580 mutex_lock(&dev->mutex);
581 dev->going_away = true;
582 mutex_unlock(&dev->mutex);
584 spin_lock_irq(&dev->event_lock);
587 * Simulate keyup events for all pressed keys so that handlers
588 * are not left with "stuck" keys. The driver may continue
589 * generate events even after we done here but they will not
590 * reach any handlers.
592 input_dev_release_keys(dev);
594 list_for_each_entry(handle, &dev->h_list, d_node)
597 spin_unlock_irq(&dev->event_lock);
600 static int input_fetch_keycode(struct input_dev *dev, int scancode)
602 switch (dev->keycodesize) {
604 return ((u8 *)dev->keycode)[scancode];
607 return ((u16 *)dev->keycode)[scancode];
610 return ((u32 *)dev->keycode)[scancode];
614 static int input_default_getkeycode(struct input_dev *dev,
615 unsigned int scancode,
616 unsigned int *keycode)
618 if (!dev->keycodesize)
621 if (scancode >= dev->keycodemax)
624 *keycode = input_fetch_keycode(dev, scancode);
629 static int input_default_setkeycode(struct input_dev *dev,
630 unsigned int scancode,
631 unsigned int keycode)
636 if (scancode >= dev->keycodemax)
639 if (!dev->keycodesize)
642 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
645 switch (dev->keycodesize) {
647 u8 *k = (u8 *)dev->keycode;
648 old_keycode = k[scancode];
649 k[scancode] = keycode;
653 u16 *k = (u16 *)dev->keycode;
654 old_keycode = k[scancode];
655 k[scancode] = keycode;
659 u32 *k = (u32 *)dev->keycode;
660 old_keycode = k[scancode];
661 k[scancode] = keycode;
666 __clear_bit(old_keycode, dev->keybit);
667 __set_bit(keycode, dev->keybit);
669 for (i = 0; i < dev->keycodemax; i++) {
670 if (input_fetch_keycode(dev, i) == old_keycode) {
671 __set_bit(old_keycode, dev->keybit);
672 break; /* Setting the bit twice is useless, so break */
680 * input_get_keycode - retrieve keycode currently mapped to a given scancode
681 * @dev: input device which keymap is being queried
682 * @scancode: scancode (or its equivalent for device in question) for which
686 * This function should be called by anyone interested in retrieving current
687 * keymap. Presently keyboard and evdev handlers use it.
689 int input_get_keycode(struct input_dev *dev,
690 unsigned int scancode, unsigned int *keycode)
695 spin_lock_irqsave(&dev->event_lock, flags);
696 retval = dev->getkeycode(dev, scancode, keycode);
697 spin_unlock_irqrestore(&dev->event_lock, flags);
701 EXPORT_SYMBOL(input_get_keycode);
704 * input_get_keycode - assign new keycode to a given scancode
705 * @dev: input device which keymap is being updated
706 * @scancode: scancode (or its equivalent for device in question)
707 * @keycode: new keycode to be assigned to the scancode
709 * This function should be called by anyone needing to update current
710 * keymap. Presently keyboard and evdev handlers use it.
712 int input_set_keycode(struct input_dev *dev,
713 unsigned int scancode, unsigned int keycode)
716 unsigned int old_keycode;
719 if (keycode > KEY_MAX)
722 spin_lock_irqsave(&dev->event_lock, flags);
724 retval = dev->getkeycode(dev, scancode, &old_keycode);
728 retval = dev->setkeycode(dev, scancode, keycode);
732 /* Make sure KEY_RESERVED did not get enabled. */
733 __clear_bit(KEY_RESERVED, dev->keybit);
736 * Simulate keyup event if keycode is not present
737 * in the keymap anymore
739 if (test_bit(EV_KEY, dev->evbit) &&
740 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
741 __test_and_clear_bit(old_keycode, dev->key)) {
743 input_pass_event(dev, EV_KEY, old_keycode, 0);
745 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
749 spin_unlock_irqrestore(&dev->event_lock, flags);
753 EXPORT_SYMBOL(input_set_keycode);
755 #define MATCH_BIT(bit, max) \
756 for (i = 0; i < BITS_TO_LONGS(max); i++) \
757 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
759 if (i != BITS_TO_LONGS(max)) \
762 static const struct input_device_id *input_match_device(struct input_handler *handler,
763 struct input_dev *dev)
765 const struct input_device_id *id;
768 for (id = handler->id_table; id->flags || id->driver_info; id++) {
770 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
771 if (id->bustype != dev->id.bustype)
774 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
775 if (id->vendor != dev->id.vendor)
778 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
779 if (id->product != dev->id.product)
782 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
783 if (id->version != dev->id.version)
786 MATCH_BIT(evbit, EV_MAX);
787 MATCH_BIT(keybit, KEY_MAX);
788 MATCH_BIT(relbit, REL_MAX);
789 MATCH_BIT(absbit, ABS_MAX);
790 MATCH_BIT(mscbit, MSC_MAX);
791 MATCH_BIT(ledbit, LED_MAX);
792 MATCH_BIT(sndbit, SND_MAX);
793 MATCH_BIT(ffbit, FF_MAX);
794 MATCH_BIT(swbit, SW_MAX);
796 if (!handler->match || handler->match(handler, dev))
803 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
805 const struct input_device_id *id;
808 id = input_match_device(handler, dev);
812 error = handler->connect(handler, dev, id);
813 if (error && error != -ENODEV)
815 "input: failed to attach handler %s to device %s, "
817 handler->name, kobject_name(&dev->dev.kobj), error);
824 static int input_bits_to_string(char *buf, int buf_size,
825 unsigned long bits, bool skip_empty)
829 if (INPUT_COMPAT_TEST) {
830 u32 dword = bits >> 32;
831 if (dword || !skip_empty)
832 len += snprintf(buf, buf_size, "%x ", dword);
834 dword = bits & 0xffffffffUL;
835 if (dword || !skip_empty || len)
836 len += snprintf(buf + len, max(buf_size - len, 0),
839 if (bits || !skip_empty)
840 len += snprintf(buf, buf_size, "%lx", bits);
846 #else /* !CONFIG_COMPAT */
848 static int input_bits_to_string(char *buf, int buf_size,
849 unsigned long bits, bool skip_empty)
851 return bits || !skip_empty ?
852 snprintf(buf, buf_size, "%lx", bits) : 0;
857 #ifdef CONFIG_PROC_FS
859 static struct proc_dir_entry *proc_bus_input_dir;
860 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
861 static int input_devices_state;
863 static inline void input_wakeup_procfs_readers(void)
865 input_devices_state++;
866 wake_up(&input_devices_poll_wait);
869 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
871 poll_wait(file, &input_devices_poll_wait, wait);
872 if (file->f_version != input_devices_state) {
873 file->f_version = input_devices_state;
874 return POLLIN | POLLRDNORM;
880 union input_seq_state {
888 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
890 union input_seq_state *state = (union input_seq_state *)&seq->private;
893 /* We need to fit into seq->private pointer */
894 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
896 error = mutex_lock_interruptible(&input_mutex);
898 state->mutex_acquired = false;
899 return ERR_PTR(error);
902 state->mutex_acquired = true;
904 return seq_list_start(&input_dev_list, *pos);
907 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
909 return seq_list_next(v, &input_dev_list, pos);
912 static void input_seq_stop(struct seq_file *seq, void *v)
914 union input_seq_state *state = (union input_seq_state *)&seq->private;
916 if (state->mutex_acquired)
917 mutex_unlock(&input_mutex);
920 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
921 unsigned long *bitmap, int max)
924 bool skip_empty = true;
927 seq_printf(seq, "B: %s=", name);
929 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
930 if (input_bits_to_string(buf, sizeof(buf),
931 bitmap[i], skip_empty)) {
933 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
938 * If no output was produced print a single 0.
946 static int input_devices_seq_show(struct seq_file *seq, void *v)
948 struct input_dev *dev = container_of(v, struct input_dev, node);
949 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
950 struct input_handle *handle;
952 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
953 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
955 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
956 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
957 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
958 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
959 seq_printf(seq, "H: Handlers=");
961 list_for_each_entry(handle, &dev->h_list, d_node)
962 seq_printf(seq, "%s ", handle->name);
965 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
966 if (test_bit(EV_KEY, dev->evbit))
967 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
968 if (test_bit(EV_REL, dev->evbit))
969 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
970 if (test_bit(EV_ABS, dev->evbit))
971 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
972 if (test_bit(EV_MSC, dev->evbit))
973 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
974 if (test_bit(EV_LED, dev->evbit))
975 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
976 if (test_bit(EV_SND, dev->evbit))
977 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
978 if (test_bit(EV_FF, dev->evbit))
979 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
980 if (test_bit(EV_SW, dev->evbit))
981 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
989 static const struct seq_operations input_devices_seq_ops = {
990 .start = input_devices_seq_start,
991 .next = input_devices_seq_next,
992 .stop = input_seq_stop,
993 .show = input_devices_seq_show,
996 static int input_proc_devices_open(struct inode *inode, struct file *file)
998 return seq_open(file, &input_devices_seq_ops);
1001 static const struct file_operations input_devices_fileops = {
1002 .owner = THIS_MODULE,
1003 .open = input_proc_devices_open,
1004 .poll = input_proc_devices_poll,
1006 .llseek = seq_lseek,
1007 .release = seq_release,
1010 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1012 union input_seq_state *state = (union input_seq_state *)&seq->private;
1015 /* We need to fit into seq->private pointer */
1016 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1018 error = mutex_lock_interruptible(&input_mutex);
1020 state->mutex_acquired = false;
1021 return ERR_PTR(error);
1024 state->mutex_acquired = true;
1027 return seq_list_start(&input_handler_list, *pos);
1030 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1032 union input_seq_state *state = (union input_seq_state *)&seq->private;
1034 state->pos = *pos + 1;
1035 return seq_list_next(v, &input_handler_list, pos);
1038 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1040 struct input_handler *handler = container_of(v, struct input_handler, node);
1041 union input_seq_state *state = (union input_seq_state *)&seq->private;
1043 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1044 if (handler->filter)
1045 seq_puts(seq, " (filter)");
1047 seq_printf(seq, " Minor=%d", handler->minor);
1048 seq_putc(seq, '\n');
1053 static const struct seq_operations input_handlers_seq_ops = {
1054 .start = input_handlers_seq_start,
1055 .next = input_handlers_seq_next,
1056 .stop = input_seq_stop,
1057 .show = input_handlers_seq_show,
1060 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1062 return seq_open(file, &input_handlers_seq_ops);
1065 static const struct file_operations input_handlers_fileops = {
1066 .owner = THIS_MODULE,
1067 .open = input_proc_handlers_open,
1069 .llseek = seq_lseek,
1070 .release = seq_release,
1073 static int __init input_proc_init(void)
1075 struct proc_dir_entry *entry;
1077 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1078 if (!proc_bus_input_dir)
1081 entry = proc_create("devices", 0, proc_bus_input_dir,
1082 &input_devices_fileops);
1086 entry = proc_create("handlers", 0, proc_bus_input_dir,
1087 &input_handlers_fileops);
1093 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1094 fail1: remove_proc_entry("bus/input", NULL);
1098 static void input_proc_exit(void)
1100 remove_proc_entry("devices", proc_bus_input_dir);
1101 remove_proc_entry("handlers", proc_bus_input_dir);
1102 remove_proc_entry("bus/input", NULL);
1105 #else /* !CONFIG_PROC_FS */
1106 static inline void input_wakeup_procfs_readers(void) { }
1107 static inline int input_proc_init(void) { return 0; }
1108 static inline void input_proc_exit(void) { }
1111 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1112 static ssize_t input_dev_show_##name(struct device *dev, \
1113 struct device_attribute *attr, \
1116 struct input_dev *input_dev = to_input_dev(dev); \
1118 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1119 input_dev->name ? input_dev->name : ""); \
1121 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1123 INPUT_DEV_STRING_ATTR_SHOW(name);
1124 INPUT_DEV_STRING_ATTR_SHOW(phys);
1125 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1127 static int input_print_modalias_bits(char *buf, int size,
1128 char name, unsigned long *bm,
1129 unsigned int min_bit, unsigned int max_bit)
1133 len += snprintf(buf, max(size, 0), "%c", name);
1134 for (i = min_bit; i < max_bit; i++)
1135 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1136 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1140 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1145 len = snprintf(buf, max(size, 0),
1146 "input:b%04Xv%04Xp%04Xe%04X-",
1147 id->id.bustype, id->id.vendor,
1148 id->id.product, id->id.version);
1150 len += input_print_modalias_bits(buf + len, size - len,
1151 'e', id->evbit, 0, EV_MAX);
1152 len += input_print_modalias_bits(buf + len, size - len,
1153 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1154 len += input_print_modalias_bits(buf + len, size - len,
1155 'r', id->relbit, 0, REL_MAX);
1156 len += input_print_modalias_bits(buf + len, size - len,
1157 'a', id->absbit, 0, ABS_MAX);
1158 len += input_print_modalias_bits(buf + len, size - len,
1159 'm', id->mscbit, 0, MSC_MAX);
1160 len += input_print_modalias_bits(buf + len, size - len,
1161 'l', id->ledbit, 0, LED_MAX);
1162 len += input_print_modalias_bits(buf + len, size - len,
1163 's', id->sndbit, 0, SND_MAX);
1164 len += input_print_modalias_bits(buf + len, size - len,
1165 'f', id->ffbit, 0, FF_MAX);
1166 len += input_print_modalias_bits(buf + len, size - len,
1167 'w', id->swbit, 0, SW_MAX);
1170 len += snprintf(buf + len, max(size - len, 0), "\n");
1175 static ssize_t input_dev_show_modalias(struct device *dev,
1176 struct device_attribute *attr,
1179 struct input_dev *id = to_input_dev(dev);
1182 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1184 return min_t(int, len, PAGE_SIZE);
1186 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1188 static struct attribute *input_dev_attrs[] = {
1189 &dev_attr_name.attr,
1190 &dev_attr_phys.attr,
1191 &dev_attr_uniq.attr,
1192 &dev_attr_modalias.attr,
1196 static struct attribute_group input_dev_attr_group = {
1197 .attrs = input_dev_attrs,
1200 #define INPUT_DEV_ID_ATTR(name) \
1201 static ssize_t input_dev_show_id_##name(struct device *dev, \
1202 struct device_attribute *attr, \
1205 struct input_dev *input_dev = to_input_dev(dev); \
1206 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1208 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1210 INPUT_DEV_ID_ATTR(bustype);
1211 INPUT_DEV_ID_ATTR(vendor);
1212 INPUT_DEV_ID_ATTR(product);
1213 INPUT_DEV_ID_ATTR(version);
1215 static struct attribute *input_dev_id_attrs[] = {
1216 &dev_attr_bustype.attr,
1217 &dev_attr_vendor.attr,
1218 &dev_attr_product.attr,
1219 &dev_attr_version.attr,
1223 static struct attribute_group input_dev_id_attr_group = {
1225 .attrs = input_dev_id_attrs,
1228 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1229 int max, int add_cr)
1233 bool skip_empty = true;
1235 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1236 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1237 bitmap[i], skip_empty);
1241 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1246 * If no output was produced print a single 0.
1249 len = snprintf(buf, buf_size, "%d", 0);
1252 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1257 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1258 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1259 struct device_attribute *attr, \
1262 struct input_dev *input_dev = to_input_dev(dev); \
1263 int len = input_print_bitmap(buf, PAGE_SIZE, \
1264 input_dev->bm##bit, ev##_MAX, \
1266 return min_t(int, len, PAGE_SIZE); \
1268 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1270 INPUT_DEV_CAP_ATTR(EV, ev);
1271 INPUT_DEV_CAP_ATTR(KEY, key);
1272 INPUT_DEV_CAP_ATTR(REL, rel);
1273 INPUT_DEV_CAP_ATTR(ABS, abs);
1274 INPUT_DEV_CAP_ATTR(MSC, msc);
1275 INPUT_DEV_CAP_ATTR(LED, led);
1276 INPUT_DEV_CAP_ATTR(SND, snd);
1277 INPUT_DEV_CAP_ATTR(FF, ff);
1278 INPUT_DEV_CAP_ATTR(SW, sw);
1280 static struct attribute *input_dev_caps_attrs[] = {
1293 static struct attribute_group input_dev_caps_attr_group = {
1294 .name = "capabilities",
1295 .attrs = input_dev_caps_attrs,
1298 static const struct attribute_group *input_dev_attr_groups[] = {
1299 &input_dev_attr_group,
1300 &input_dev_id_attr_group,
1301 &input_dev_caps_attr_group,
1305 static void input_dev_release(struct device *device)
1307 struct input_dev *dev = to_input_dev(device);
1309 input_ff_destroy(dev);
1310 input_mt_destroy_slots(dev);
1313 module_put(THIS_MODULE);
1317 * Input uevent interface - loading event handlers based on
1320 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1321 const char *name, unsigned long *bitmap, int max)
1325 if (add_uevent_var(env, "%s=", name))
1328 len = input_print_bitmap(&env->buf[env->buflen - 1],
1329 sizeof(env->buf) - env->buflen,
1330 bitmap, max, false);
1331 if (len >= (sizeof(env->buf) - env->buflen))
1338 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1339 struct input_dev *dev)
1343 if (add_uevent_var(env, "MODALIAS="))
1346 len = input_print_modalias(&env->buf[env->buflen - 1],
1347 sizeof(env->buf) - env->buflen,
1349 if (len >= (sizeof(env->buf) - env->buflen))
1356 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1358 int err = add_uevent_var(env, fmt, val); \
1363 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1365 int err = input_add_uevent_bm_var(env, name, bm, max); \
1370 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1372 int err = input_add_uevent_modalias_var(env, dev); \
1377 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1379 struct input_dev *dev = to_input_dev(device);
1381 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1382 dev->id.bustype, dev->id.vendor,
1383 dev->id.product, dev->id.version);
1385 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1387 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1389 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1391 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1392 if (test_bit(EV_KEY, dev->evbit))
1393 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1394 if (test_bit(EV_REL, dev->evbit))
1395 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1396 if (test_bit(EV_ABS, dev->evbit))
1397 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1398 if (test_bit(EV_MSC, dev->evbit))
1399 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1400 if (test_bit(EV_LED, dev->evbit))
1401 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1402 if (test_bit(EV_SND, dev->evbit))
1403 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1404 if (test_bit(EV_FF, dev->evbit))
1405 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1406 if (test_bit(EV_SW, dev->evbit))
1407 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1409 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1414 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1419 if (!test_bit(EV_##type, dev->evbit)) \
1422 for (i = 0; i < type##_MAX; i++) { \
1423 if (!test_bit(i, dev->bits##bit)) \
1426 active = test_bit(i, dev->bits); \
1427 if (!active && !on) \
1430 dev->event(dev, EV_##type, i, on ? active : 0); \
1435 static void input_dev_reset(struct input_dev *dev, bool activate)
1440 INPUT_DO_TOGGLE(dev, LED, led, activate);
1441 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1443 if (activate && test_bit(EV_REP, dev->evbit)) {
1444 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1445 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1449 static int input_dev_suspend(struct device *dev)
1451 struct input_dev *input_dev = to_input_dev(dev);
1453 mutex_lock(&input_dev->mutex);
1454 input_dev_reset(input_dev, false);
1455 mutex_unlock(&input_dev->mutex);
1460 static int input_dev_resume(struct device *dev)
1462 struct input_dev *input_dev = to_input_dev(dev);
1464 mutex_lock(&input_dev->mutex);
1465 input_dev_reset(input_dev, true);
1468 * Keys that have been pressed at suspend time are unlikely
1469 * to be still pressed when we resume.
1471 spin_lock_irq(&input_dev->event_lock);
1472 input_dev_release_keys(input_dev);
1473 spin_unlock_irq(&input_dev->event_lock);
1475 mutex_unlock(&input_dev->mutex);
1480 static const struct dev_pm_ops input_dev_pm_ops = {
1481 .suspend = input_dev_suspend,
1482 .resume = input_dev_resume,
1483 .poweroff = input_dev_suspend,
1484 .restore = input_dev_resume,
1486 #endif /* CONFIG_PM */
1488 static struct device_type input_dev_type = {
1489 .groups = input_dev_attr_groups,
1490 .release = input_dev_release,
1491 .uevent = input_dev_uevent,
1493 .pm = &input_dev_pm_ops,
1497 static char *input_devnode(struct device *dev, mode_t *mode)
1499 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1502 struct class input_class = {
1504 .devnode = input_devnode,
1506 EXPORT_SYMBOL_GPL(input_class);
1509 * input_allocate_device - allocate memory for new input device
1511 * Returns prepared struct input_dev or NULL.
1513 * NOTE: Use input_free_device() to free devices that have not been
1514 * registered; input_unregister_device() should be used for already
1515 * registered devices.
1517 struct input_dev *input_allocate_device(void)
1519 struct input_dev *dev;
1521 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1523 dev->dev.type = &input_dev_type;
1524 dev->dev.class = &input_class;
1525 device_initialize(&dev->dev);
1526 mutex_init(&dev->mutex);
1527 spin_lock_init(&dev->event_lock);
1528 INIT_LIST_HEAD(&dev->h_list);
1529 INIT_LIST_HEAD(&dev->node);
1531 __module_get(THIS_MODULE);
1536 EXPORT_SYMBOL(input_allocate_device);
1539 * input_free_device - free memory occupied by input_dev structure
1540 * @dev: input device to free
1542 * This function should only be used if input_register_device()
1543 * was not called yet or if it failed. Once device was registered
1544 * use input_unregister_device() and memory will be freed once last
1545 * reference to the device is dropped.
1547 * Device should be allocated by input_allocate_device().
1549 * NOTE: If there are references to the input device then memory
1550 * will not be freed until last reference is dropped.
1552 void input_free_device(struct input_dev *dev)
1555 input_put_device(dev);
1557 EXPORT_SYMBOL(input_free_device);
1560 * input_mt_create_slots() - create MT input slots
1561 * @dev: input device supporting MT events and finger tracking
1562 * @num_slots: number of slots used by the device
1564 * This function allocates all necessary memory for MT slot handling
1565 * in the input device, and adds ABS_MT_SLOT to the device capabilities.
1567 int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)
1572 dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
1576 dev->mtsize = num_slots;
1577 input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
1581 EXPORT_SYMBOL(input_mt_create_slots);
1584 * input_mt_destroy_slots() - frees the MT slots of the input device
1585 * @dev: input device with allocated MT slots
1587 * This function is only needed in error path as the input core will
1588 * automatically free the MT slots when the device is destroyed.
1590 void input_mt_destroy_slots(struct input_dev *dev)
1596 EXPORT_SYMBOL(input_mt_destroy_slots);
1599 * input_set_capability - mark device as capable of a certain event
1600 * @dev: device that is capable of emitting or accepting event
1601 * @type: type of the event (EV_KEY, EV_REL, etc...)
1604 * In addition to setting up corresponding bit in appropriate capability
1605 * bitmap the function also adjusts dev->evbit.
1607 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1611 __set_bit(code, dev->keybit);
1615 __set_bit(code, dev->relbit);
1619 __set_bit(code, dev->absbit);
1623 __set_bit(code, dev->mscbit);
1627 __set_bit(code, dev->swbit);
1631 __set_bit(code, dev->ledbit);
1635 __set_bit(code, dev->sndbit);
1639 __set_bit(code, dev->ffbit);
1648 "input_set_capability: unknown type %u (code %u)\n",
1654 __set_bit(type, dev->evbit);
1656 EXPORT_SYMBOL(input_set_capability);
1658 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1660 if (!test_bit(EV_##type, dev->evbit)) \
1661 memset(dev->bits##bit, 0, \
1662 sizeof(dev->bits##bit)); \
1665 static void input_cleanse_bitmasks(struct input_dev *dev)
1667 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1668 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1669 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1670 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1671 INPUT_CLEANSE_BITMASK(dev, LED, led);
1672 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1673 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1674 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1678 * input_register_device - register device with input core
1679 * @dev: device to be registered
1681 * This function registers device with input core. The device must be
1682 * allocated with input_allocate_device() and all it's capabilities
1683 * set up before registering.
1684 * If function fails the device must be freed with input_free_device().
1685 * Once device has been successfully registered it can be unregistered
1686 * with input_unregister_device(); input_free_device() should not be
1687 * called in this case.
1689 int input_register_device(struct input_dev *dev)
1691 static atomic_t input_no = ATOMIC_INIT(0);
1692 struct input_handler *handler;
1696 /* Every input device generates EV_SYN/SYN_REPORT events. */
1697 __set_bit(EV_SYN, dev->evbit);
1699 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1700 __clear_bit(KEY_RESERVED, dev->keybit);
1702 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1703 input_cleanse_bitmasks(dev);
1706 * If delay and period are pre-set by the driver, then autorepeating
1707 * is handled by the driver itself and we don't do it in input.c.
1709 init_timer(&dev->timer);
1710 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1711 dev->timer.data = (long) dev;
1712 dev->timer.function = input_repeat_key;
1713 dev->rep[REP_DELAY] = 250;
1714 dev->rep[REP_PERIOD] = 33;
1717 if (!dev->getkeycode)
1718 dev->getkeycode = input_default_getkeycode;
1720 if (!dev->setkeycode)
1721 dev->setkeycode = input_default_setkeycode;
1723 dev_set_name(&dev->dev, "input%ld",
1724 (unsigned long) atomic_inc_return(&input_no) - 1);
1726 error = device_add(&dev->dev);
1730 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1731 printk(KERN_INFO "input: %s as %s\n",
1732 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1735 error = mutex_lock_interruptible(&input_mutex);
1737 device_del(&dev->dev);
1741 list_add_tail(&dev->node, &input_dev_list);
1743 list_for_each_entry(handler, &input_handler_list, node)
1744 input_attach_handler(dev, handler);
1746 input_wakeup_procfs_readers();
1748 mutex_unlock(&input_mutex);
1752 EXPORT_SYMBOL(input_register_device);
1755 * input_unregister_device - unregister previously registered device
1756 * @dev: device to be unregistered
1758 * This function unregisters an input device. Once device is unregistered
1759 * the caller should not try to access it as it may get freed at any moment.
1761 void input_unregister_device(struct input_dev *dev)
1763 struct input_handle *handle, *next;
1765 input_disconnect_device(dev);
1767 mutex_lock(&input_mutex);
1769 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1770 handle->handler->disconnect(handle);
1771 WARN_ON(!list_empty(&dev->h_list));
1773 del_timer_sync(&dev->timer);
1774 list_del_init(&dev->node);
1776 input_wakeup_procfs_readers();
1778 mutex_unlock(&input_mutex);
1780 device_unregister(&dev->dev);
1782 EXPORT_SYMBOL(input_unregister_device);
1785 * input_register_handler - register a new input handler
1786 * @handler: handler to be registered
1788 * This function registers a new input handler (interface) for input
1789 * devices in the system and attaches it to all input devices that
1790 * are compatible with the handler.
1792 int input_register_handler(struct input_handler *handler)
1794 struct input_dev *dev;
1797 retval = mutex_lock_interruptible(&input_mutex);
1801 INIT_LIST_HEAD(&handler->h_list);
1803 if (handler->fops != NULL) {
1804 if (input_table[handler->minor >> 5]) {
1808 input_table[handler->minor >> 5] = handler;
1811 list_add_tail(&handler->node, &input_handler_list);
1813 list_for_each_entry(dev, &input_dev_list, node)
1814 input_attach_handler(dev, handler);
1816 input_wakeup_procfs_readers();
1819 mutex_unlock(&input_mutex);
1822 EXPORT_SYMBOL(input_register_handler);
1825 * input_unregister_handler - unregisters an input handler
1826 * @handler: handler to be unregistered
1828 * This function disconnects a handler from its input devices and
1829 * removes it from lists of known handlers.
1831 void input_unregister_handler(struct input_handler *handler)
1833 struct input_handle *handle, *next;
1835 mutex_lock(&input_mutex);
1837 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1838 handler->disconnect(handle);
1839 WARN_ON(!list_empty(&handler->h_list));
1841 list_del_init(&handler->node);
1843 if (handler->fops != NULL)
1844 input_table[handler->minor >> 5] = NULL;
1846 input_wakeup_procfs_readers();
1848 mutex_unlock(&input_mutex);
1850 EXPORT_SYMBOL(input_unregister_handler);
1853 * input_handler_for_each_handle - handle iterator
1854 * @handler: input handler to iterate
1855 * @data: data for the callback
1856 * @fn: function to be called for each handle
1858 * Iterate over @bus's list of devices, and call @fn for each, passing
1859 * it @data and stop when @fn returns a non-zero value. The function is
1860 * using RCU to traverse the list and therefore may be usind in atonic
1861 * contexts. The @fn callback is invoked from RCU critical section and
1862 * thus must not sleep.
1864 int input_handler_for_each_handle(struct input_handler *handler, void *data,
1865 int (*fn)(struct input_handle *, void *))
1867 struct input_handle *handle;
1872 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
1873 retval = fn(handle, data);
1882 EXPORT_SYMBOL(input_handler_for_each_handle);
1885 * input_register_handle - register a new input handle
1886 * @handle: handle to register
1888 * This function puts a new input handle onto device's
1889 * and handler's lists so that events can flow through
1890 * it once it is opened using input_open_device().
1892 * This function is supposed to be called from handler's
1895 int input_register_handle(struct input_handle *handle)
1897 struct input_handler *handler = handle->handler;
1898 struct input_dev *dev = handle->dev;
1902 * We take dev->mutex here to prevent race with
1903 * input_release_device().
1905 error = mutex_lock_interruptible(&dev->mutex);
1910 * Filters go to the head of the list, normal handlers
1913 if (handler->filter)
1914 list_add_rcu(&handle->d_node, &dev->h_list);
1916 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1918 mutex_unlock(&dev->mutex);
1921 * Since we are supposed to be called from ->connect()
1922 * which is mutually exclusive with ->disconnect()
1923 * we can't be racing with input_unregister_handle()
1924 * and so separate lock is not needed here.
1926 list_add_tail_rcu(&handle->h_node, &handler->h_list);
1929 handler->start(handle);
1933 EXPORT_SYMBOL(input_register_handle);
1936 * input_unregister_handle - unregister an input handle
1937 * @handle: handle to unregister
1939 * This function removes input handle from device's
1940 * and handler's lists.
1942 * This function is supposed to be called from handler's
1943 * disconnect() method.
1945 void input_unregister_handle(struct input_handle *handle)
1947 struct input_dev *dev = handle->dev;
1949 list_del_rcu(&handle->h_node);
1952 * Take dev->mutex to prevent race with input_release_device().
1954 mutex_lock(&dev->mutex);
1955 list_del_rcu(&handle->d_node);
1956 mutex_unlock(&dev->mutex);
1960 EXPORT_SYMBOL(input_unregister_handle);
1962 static int input_open_file(struct inode *inode, struct file *file)
1964 struct input_handler *handler;
1965 const struct file_operations *old_fops, *new_fops = NULL;
1968 err = mutex_lock_interruptible(&input_mutex);
1972 /* No load-on-demand here? */
1973 handler = input_table[iminor(inode) >> 5];
1975 new_fops = fops_get(handler->fops);
1977 mutex_unlock(&input_mutex);
1980 * That's _really_ odd. Usually NULL ->open means "nothing special",
1981 * not "no device". Oh, well...
1983 if (!new_fops || !new_fops->open) {
1989 old_fops = file->f_op;
1990 file->f_op = new_fops;
1992 err = new_fops->open(inode, file);
1994 fops_put(file->f_op);
1995 file->f_op = fops_get(old_fops);
2002 static const struct file_operations input_fops = {
2003 .owner = THIS_MODULE,
2004 .open = input_open_file,
2007 static int __init input_init(void)
2011 err = class_register(&input_class);
2013 printk(KERN_ERR "input: unable to register input_dev class\n");
2017 err = input_proc_init();
2021 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2023 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
2029 fail2: input_proc_exit();
2030 fail1: class_unregister(&input_class);
2034 static void __exit input_exit(void)
2037 unregister_chrdev(INPUT_MAJOR, "input");
2038 class_unregister(&input_class);
2041 subsys_initcall(input_init);
2042 module_exit(input_exit);