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/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/sched.h>
21 #include <linux/seq_file.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25 #include <linux/rcupdate.h>
26 #include <linux/smp_lock.h>
27 #include "input-compat.h"
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
30 MODULE_DESCRIPTION("Input core");
31 MODULE_LICENSE("GPL");
33 #define INPUT_DEVICES 256
36 * EV_ABS events which should not be cached are listed here.
38 static unsigned int input_abs_bypass_init_data[] __initdata = {
51 static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
53 static LIST_HEAD(input_dev_list);
54 static LIST_HEAD(input_handler_list);
57 * input_mutex protects access to both input_dev_list and input_handler_list.
58 * This also causes input_[un]register_device and input_[un]register_handler
59 * be mutually exclusive which simplifies locking in drivers implementing
62 static DEFINE_MUTEX(input_mutex);
64 static struct input_handler *input_table[8];
66 static inline int is_event_supported(unsigned int code,
67 unsigned long *bm, unsigned int max)
69 return code <= max && test_bit(code, bm);
72 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
75 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
78 if (value > old_val - fuzz && value < old_val + fuzz)
79 return (old_val * 3 + value) / 4;
81 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
82 return (old_val + value) / 2;
89 * Pass event through all open handles. This function is called with
90 * dev->event_lock held and interrupts disabled.
92 static void input_pass_event(struct input_dev *dev,
93 unsigned int type, unsigned int code, int value)
95 struct input_handle *handle;
99 handle = rcu_dereference(dev->grab);
101 handle->handler->event(handle, type, code, value);
103 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
105 handle->handler->event(handle,
111 * Generate software autorepeat event. Note that we take
112 * dev->event_lock here to avoid racing with input_event
113 * which may cause keys get "stuck".
115 static void input_repeat_key(unsigned long data)
117 struct input_dev *dev = (void *) data;
120 spin_lock_irqsave(&dev->event_lock, flags);
122 if (test_bit(dev->repeat_key, dev->key) &&
123 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
125 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
129 * Only send SYN_REPORT if we are not in a middle
130 * of driver parsing a new hardware packet.
131 * Otherwise assume that the driver will send
132 * SYN_REPORT once it's done.
134 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
137 if (dev->rep[REP_PERIOD])
138 mod_timer(&dev->timer, jiffies +
139 msecs_to_jiffies(dev->rep[REP_PERIOD]));
142 spin_unlock_irqrestore(&dev->event_lock, flags);
145 static void input_start_autorepeat(struct input_dev *dev, int code)
147 if (test_bit(EV_REP, dev->evbit) &&
148 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
150 dev->repeat_key = code;
151 mod_timer(&dev->timer,
152 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
156 static void input_stop_autorepeat(struct input_dev *dev)
158 del_timer(&dev->timer);
161 #define INPUT_IGNORE_EVENT 0
162 #define INPUT_PASS_TO_HANDLERS 1
163 #define INPUT_PASS_TO_DEVICE 2
164 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
166 static void input_handle_event(struct input_dev *dev,
167 unsigned int type, unsigned int code, int value)
169 int disposition = INPUT_IGNORE_EVENT;
176 disposition = INPUT_PASS_TO_ALL;
182 disposition = INPUT_PASS_TO_HANDLERS;
187 disposition = INPUT_PASS_TO_HANDLERS;
193 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
194 !!test_bit(code, dev->key) != value) {
197 __change_bit(code, dev->key);
199 input_start_autorepeat(dev, code);
201 input_stop_autorepeat(dev);
204 disposition = INPUT_PASS_TO_HANDLERS;
209 if (is_event_supported(code, dev->swbit, SW_MAX) &&
210 !!test_bit(code, dev->sw) != value) {
212 __change_bit(code, dev->sw);
213 disposition = INPUT_PASS_TO_HANDLERS;
218 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
220 if (test_bit(code, input_abs_bypass)) {
221 disposition = INPUT_PASS_TO_HANDLERS;
225 value = input_defuzz_abs_event(value,
226 dev->abs[code], dev->absfuzz[code]);
228 if (dev->abs[code] != value) {
229 dev->abs[code] = value;
230 disposition = INPUT_PASS_TO_HANDLERS;
236 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
237 disposition = INPUT_PASS_TO_HANDLERS;
242 if (is_event_supported(code, dev->mscbit, MSC_MAX))
243 disposition = INPUT_PASS_TO_ALL;
248 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
249 !!test_bit(code, dev->led) != value) {
251 __change_bit(code, dev->led);
252 disposition = INPUT_PASS_TO_ALL;
257 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
259 if (!!test_bit(code, dev->snd) != !!value)
260 __change_bit(code, dev->snd);
261 disposition = INPUT_PASS_TO_ALL;
266 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
267 dev->rep[code] = value;
268 disposition = INPUT_PASS_TO_ALL;
274 disposition = INPUT_PASS_TO_ALL;
278 disposition = INPUT_PASS_TO_ALL;
282 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
285 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
286 dev->event(dev, type, code, value);
288 if (disposition & INPUT_PASS_TO_HANDLERS)
289 input_pass_event(dev, type, code, value);
293 * input_event() - report new input event
294 * @dev: device that generated the event
295 * @type: type of the event
297 * @value: value of the event
299 * This function should be used by drivers implementing various input
300 * devices to report input events. See also input_inject_event().
302 * NOTE: input_event() may be safely used right after input device was
303 * allocated with input_allocate_device(), even before it is registered
304 * with input_register_device(), but the event will not reach any of the
305 * input handlers. Such early invocation of input_event() may be used
306 * to 'seed' initial state of a switch or initial position of absolute
309 void input_event(struct input_dev *dev,
310 unsigned int type, unsigned int code, int value)
314 if (is_event_supported(type, dev->evbit, EV_MAX)) {
316 spin_lock_irqsave(&dev->event_lock, flags);
317 add_input_randomness(type, code, value);
318 input_handle_event(dev, type, code, value);
319 spin_unlock_irqrestore(&dev->event_lock, flags);
322 EXPORT_SYMBOL(input_event);
325 * input_inject_event() - send input event from input handler
326 * @handle: input handle to send event through
327 * @type: type of the event
329 * @value: value of the event
331 * Similar to input_event() but will ignore event if device is
332 * "grabbed" and handle injecting event is not the one that owns
335 void input_inject_event(struct input_handle *handle,
336 unsigned int type, unsigned int code, int value)
338 struct input_dev *dev = handle->dev;
339 struct input_handle *grab;
342 if (is_event_supported(type, dev->evbit, EV_MAX)) {
343 spin_lock_irqsave(&dev->event_lock, flags);
346 grab = rcu_dereference(dev->grab);
347 if (!grab || grab == handle)
348 input_handle_event(dev, type, code, value);
351 spin_unlock_irqrestore(&dev->event_lock, flags);
354 EXPORT_SYMBOL(input_inject_event);
357 * input_grab_device - grabs device for exclusive use
358 * @handle: input handle that wants to own the device
360 * When a device is grabbed by an input handle all events generated by
361 * the device are delivered only to this handle. Also events injected
362 * by other input handles are ignored while device is grabbed.
364 int input_grab_device(struct input_handle *handle)
366 struct input_dev *dev = handle->dev;
369 retval = mutex_lock_interruptible(&dev->mutex);
378 rcu_assign_pointer(dev->grab, handle);
382 mutex_unlock(&dev->mutex);
385 EXPORT_SYMBOL(input_grab_device);
387 static void __input_release_device(struct input_handle *handle)
389 struct input_dev *dev = handle->dev;
391 if (dev->grab == handle) {
392 rcu_assign_pointer(dev->grab, NULL);
393 /* Make sure input_pass_event() notices that grab is gone */
396 list_for_each_entry(handle, &dev->h_list, d_node)
397 if (handle->open && handle->handler->start)
398 handle->handler->start(handle);
403 * input_release_device - release previously grabbed device
404 * @handle: input handle that owns the device
406 * Releases previously grabbed device so that other input handles can
407 * start receiving input events. Upon release all handlers attached
408 * to the device have their start() method called so they have a change
409 * to synchronize device state with the rest of the system.
411 void input_release_device(struct input_handle *handle)
413 struct input_dev *dev = handle->dev;
415 mutex_lock(&dev->mutex);
416 __input_release_device(handle);
417 mutex_unlock(&dev->mutex);
419 EXPORT_SYMBOL(input_release_device);
422 * input_open_device - open input device
423 * @handle: handle through which device is being accessed
425 * This function should be called by input handlers when they
426 * want to start receive events from given input device.
428 int input_open_device(struct input_handle *handle)
430 struct input_dev *dev = handle->dev;
433 retval = mutex_lock_interruptible(&dev->mutex);
437 if (dev->going_away) {
444 if (!dev->users++ && dev->open)
445 retval = dev->open(dev);
449 if (!--handle->open) {
451 * Make sure we are not delivering any more events
452 * through this handle
459 mutex_unlock(&dev->mutex);
462 EXPORT_SYMBOL(input_open_device);
464 int input_flush_device(struct input_handle *handle, struct file *file)
466 struct input_dev *dev = handle->dev;
469 retval = mutex_lock_interruptible(&dev->mutex);
474 retval = dev->flush(dev, file);
476 mutex_unlock(&dev->mutex);
479 EXPORT_SYMBOL(input_flush_device);
482 * input_close_device - close input device
483 * @handle: handle through which device is being accessed
485 * This function should be called by input handlers when they
486 * want to stop receive events from given input device.
488 void input_close_device(struct input_handle *handle)
490 struct input_dev *dev = handle->dev;
492 mutex_lock(&dev->mutex);
494 __input_release_device(handle);
496 if (!--dev->users && dev->close)
499 if (!--handle->open) {
501 * synchronize_rcu() makes sure that input_pass_event()
502 * completed and that no more input events are delivered
503 * through this handle
508 mutex_unlock(&dev->mutex);
510 EXPORT_SYMBOL(input_close_device);
513 * Prepare device for unregistering
515 static void input_disconnect_device(struct input_dev *dev)
517 struct input_handle *handle;
521 * Mark device as going away. Note that we take dev->mutex here
522 * not to protect access to dev->going_away but rather to ensure
523 * that there are no threads in the middle of input_open_device()
525 mutex_lock(&dev->mutex);
526 dev->going_away = true;
527 mutex_unlock(&dev->mutex);
529 spin_lock_irq(&dev->event_lock);
532 * Simulate keyup events for all pressed keys so that handlers
533 * are not left with "stuck" keys. The driver may continue
534 * generate events even after we done here but they will not
535 * reach any handlers.
537 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
538 for (code = 0; code <= KEY_MAX; code++) {
539 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
540 __test_and_clear_bit(code, dev->key)) {
541 input_pass_event(dev, EV_KEY, code, 0);
544 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
547 list_for_each_entry(handle, &dev->h_list, d_node)
550 spin_unlock_irq(&dev->event_lock);
553 static int input_fetch_keycode(struct input_dev *dev, int scancode)
555 switch (dev->keycodesize) {
557 return ((u8 *)dev->keycode)[scancode];
560 return ((u16 *)dev->keycode)[scancode];
563 return ((u32 *)dev->keycode)[scancode];
567 static int input_default_getkeycode(struct input_dev *dev,
568 int scancode, int *keycode)
570 if (!dev->keycodesize)
573 if (scancode >= dev->keycodemax)
576 *keycode = input_fetch_keycode(dev, scancode);
581 static int input_default_setkeycode(struct input_dev *dev,
582 int scancode, int keycode)
587 if (scancode >= dev->keycodemax)
590 if (!dev->keycodesize)
593 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
596 switch (dev->keycodesize) {
598 u8 *k = (u8 *)dev->keycode;
599 old_keycode = k[scancode];
600 k[scancode] = keycode;
604 u16 *k = (u16 *)dev->keycode;
605 old_keycode = k[scancode];
606 k[scancode] = keycode;
610 u32 *k = (u32 *)dev->keycode;
611 old_keycode = k[scancode];
612 k[scancode] = keycode;
617 __clear_bit(old_keycode, dev->keybit);
618 __set_bit(keycode, dev->keybit);
620 for (i = 0; i < dev->keycodemax; i++) {
621 if (input_fetch_keycode(dev, i) == old_keycode) {
622 __set_bit(old_keycode, dev->keybit);
623 break; /* Setting the bit twice is useless, so break */
631 * input_get_keycode - retrieve keycode currently mapped to a given scancode
632 * @dev: input device which keymap is being queried
633 * @scancode: scancode (or its equivalent for device in question) for which
637 * This function should be called by anyone interested in retrieving current
638 * keymap. Presently keyboard and evdev handlers use it.
640 int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
645 return dev->getkeycode(dev, scancode, keycode);
647 EXPORT_SYMBOL(input_get_keycode);
650 * input_get_keycode - assign new keycode to a given scancode
651 * @dev: input device which keymap is being updated
652 * @scancode: scancode (or its equivalent for device in question)
653 * @keycode: new keycode to be assigned to the scancode
655 * This function should be called by anyone needing to update current
656 * keymap. Presently keyboard and evdev handlers use it.
658 int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
667 if (keycode < 0 || keycode > KEY_MAX)
670 spin_lock_irqsave(&dev->event_lock, flags);
672 retval = dev->getkeycode(dev, scancode, &old_keycode);
676 retval = dev->setkeycode(dev, scancode, keycode);
680 /* Make sure KEY_RESERVED did not get enabled. */
681 __clear_bit(KEY_RESERVED, dev->keybit);
684 * Simulate keyup event if keycode is not present
685 * in the keymap anymore
687 if (test_bit(EV_KEY, dev->evbit) &&
688 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
689 __test_and_clear_bit(old_keycode, dev->key)) {
691 input_pass_event(dev, EV_KEY, old_keycode, 0);
693 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
697 spin_unlock_irqrestore(&dev->event_lock, flags);
701 EXPORT_SYMBOL(input_set_keycode);
703 #define MATCH_BIT(bit, max) \
704 for (i = 0; i < BITS_TO_LONGS(max); i++) \
705 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
707 if (i != BITS_TO_LONGS(max)) \
710 static const struct input_device_id *input_match_device(const struct input_device_id *id,
711 struct input_dev *dev)
715 for (; id->flags || id->driver_info; id++) {
717 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
718 if (id->bustype != dev->id.bustype)
721 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
722 if (id->vendor != dev->id.vendor)
725 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
726 if (id->product != dev->id.product)
729 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
730 if (id->version != dev->id.version)
733 MATCH_BIT(evbit, EV_MAX);
734 MATCH_BIT(keybit, KEY_MAX);
735 MATCH_BIT(relbit, REL_MAX);
736 MATCH_BIT(absbit, ABS_MAX);
737 MATCH_BIT(mscbit, MSC_MAX);
738 MATCH_BIT(ledbit, LED_MAX);
739 MATCH_BIT(sndbit, SND_MAX);
740 MATCH_BIT(ffbit, FF_MAX);
741 MATCH_BIT(swbit, SW_MAX);
749 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
751 const struct input_device_id *id;
754 if (handler->blacklist && input_match_device(handler->blacklist, dev))
757 id = input_match_device(handler->id_table, dev);
761 error = handler->connect(handler, dev, id);
762 if (error && error != -ENODEV)
764 "input: failed to attach handler %s to device %s, "
766 handler->name, kobject_name(&dev->dev.kobj), error);
773 static int input_bits_to_string(char *buf, int buf_size,
774 unsigned long bits, bool skip_empty)
778 if (INPUT_COMPAT_TEST) {
779 u32 dword = bits >> 32;
780 if (dword || !skip_empty)
781 len += snprintf(buf, buf_size, "%x ", dword);
783 dword = bits & 0xffffffffUL;
784 if (dword || !skip_empty || len)
785 len += snprintf(buf + len, max(buf_size - len, 0),
788 if (bits || !skip_empty)
789 len += snprintf(buf, buf_size, "%lx", bits);
795 #else /* !CONFIG_COMPAT */
797 static int input_bits_to_string(char *buf, int buf_size,
798 unsigned long bits, bool skip_empty)
800 return bits || !skip_empty ?
801 snprintf(buf, buf_size, "%lx", bits) : 0;
806 #ifdef CONFIG_PROC_FS
808 static struct proc_dir_entry *proc_bus_input_dir;
809 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
810 static int input_devices_state;
812 static inline void input_wakeup_procfs_readers(void)
814 input_devices_state++;
815 wake_up(&input_devices_poll_wait);
818 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
820 poll_wait(file, &input_devices_poll_wait, wait);
821 if (file->f_version != input_devices_state) {
822 file->f_version = input_devices_state;
823 return POLLIN | POLLRDNORM;
829 union input_seq_state {
837 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
839 union input_seq_state *state = (union input_seq_state *)&seq->private;
842 /* We need to fit into seq->private pointer */
843 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
845 error = mutex_lock_interruptible(&input_mutex);
847 state->mutex_acquired = false;
848 return ERR_PTR(error);
851 state->mutex_acquired = true;
853 return seq_list_start(&input_dev_list, *pos);
856 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
858 return seq_list_next(v, &input_dev_list, pos);
861 static void input_seq_stop(struct seq_file *seq, void *v)
863 union input_seq_state *state = (union input_seq_state *)&seq->private;
865 if (state->mutex_acquired)
866 mutex_unlock(&input_mutex);
869 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
870 unsigned long *bitmap, int max)
873 bool skip_empty = true;
876 seq_printf(seq, "B: %s=", name);
878 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
879 if (input_bits_to_string(buf, sizeof(buf),
880 bitmap[i], skip_empty)) {
882 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
887 * If no output was produced print a single 0.
895 static int input_devices_seq_show(struct seq_file *seq, void *v)
897 struct input_dev *dev = container_of(v, struct input_dev, node);
898 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
899 struct input_handle *handle;
901 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
902 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
904 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
905 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
906 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
907 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
908 seq_printf(seq, "H: Handlers=");
910 list_for_each_entry(handle, &dev->h_list, d_node)
911 seq_printf(seq, "%s ", handle->name);
914 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
915 if (test_bit(EV_KEY, dev->evbit))
916 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
917 if (test_bit(EV_REL, dev->evbit))
918 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
919 if (test_bit(EV_ABS, dev->evbit))
920 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
921 if (test_bit(EV_MSC, dev->evbit))
922 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
923 if (test_bit(EV_LED, dev->evbit))
924 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
925 if (test_bit(EV_SND, dev->evbit))
926 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
927 if (test_bit(EV_FF, dev->evbit))
928 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
929 if (test_bit(EV_SW, dev->evbit))
930 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
938 static const struct seq_operations input_devices_seq_ops = {
939 .start = input_devices_seq_start,
940 .next = input_devices_seq_next,
941 .stop = input_seq_stop,
942 .show = input_devices_seq_show,
945 static int input_proc_devices_open(struct inode *inode, struct file *file)
947 return seq_open(file, &input_devices_seq_ops);
950 static const struct file_operations input_devices_fileops = {
951 .owner = THIS_MODULE,
952 .open = input_proc_devices_open,
953 .poll = input_proc_devices_poll,
956 .release = seq_release,
959 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
961 union input_seq_state *state = (union input_seq_state *)&seq->private;
964 /* We need to fit into seq->private pointer */
965 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
967 error = mutex_lock_interruptible(&input_mutex);
969 state->mutex_acquired = false;
970 return ERR_PTR(error);
973 state->mutex_acquired = true;
976 return seq_list_start(&input_handler_list, *pos);
979 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
981 union input_seq_state *state = (union input_seq_state *)&seq->private;
983 state->pos = *pos + 1;
984 return seq_list_next(v, &input_handler_list, pos);
987 static int input_handlers_seq_show(struct seq_file *seq, void *v)
989 struct input_handler *handler = container_of(v, struct input_handler, node);
990 union input_seq_state *state = (union input_seq_state *)&seq->private;
992 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
994 seq_printf(seq, " Minor=%d", handler->minor);
1000 static const struct seq_operations input_handlers_seq_ops = {
1001 .start = input_handlers_seq_start,
1002 .next = input_handlers_seq_next,
1003 .stop = input_seq_stop,
1004 .show = input_handlers_seq_show,
1007 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1009 return seq_open(file, &input_handlers_seq_ops);
1012 static const struct file_operations input_handlers_fileops = {
1013 .owner = THIS_MODULE,
1014 .open = input_proc_handlers_open,
1016 .llseek = seq_lseek,
1017 .release = seq_release,
1020 static int __init input_proc_init(void)
1022 struct proc_dir_entry *entry;
1024 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1025 if (!proc_bus_input_dir)
1028 entry = proc_create("devices", 0, proc_bus_input_dir,
1029 &input_devices_fileops);
1033 entry = proc_create("handlers", 0, proc_bus_input_dir,
1034 &input_handlers_fileops);
1040 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1041 fail1: remove_proc_entry("bus/input", NULL);
1045 static void input_proc_exit(void)
1047 remove_proc_entry("devices", proc_bus_input_dir);
1048 remove_proc_entry("handlers", proc_bus_input_dir);
1049 remove_proc_entry("bus/input", NULL);
1052 #else /* !CONFIG_PROC_FS */
1053 static inline void input_wakeup_procfs_readers(void) { }
1054 static inline int input_proc_init(void) { return 0; }
1055 static inline void input_proc_exit(void) { }
1058 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1059 static ssize_t input_dev_show_##name(struct device *dev, \
1060 struct device_attribute *attr, \
1063 struct input_dev *input_dev = to_input_dev(dev); \
1065 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1066 input_dev->name ? input_dev->name : ""); \
1068 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1070 INPUT_DEV_STRING_ATTR_SHOW(name);
1071 INPUT_DEV_STRING_ATTR_SHOW(phys);
1072 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1074 static int input_print_modalias_bits(char *buf, int size,
1075 char name, unsigned long *bm,
1076 unsigned int min_bit, unsigned int max_bit)
1080 len += snprintf(buf, max(size, 0), "%c", name);
1081 for (i = min_bit; i < max_bit; i++)
1082 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1083 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1087 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1092 len = snprintf(buf, max(size, 0),
1093 "input:b%04Xv%04Xp%04Xe%04X-",
1094 id->id.bustype, id->id.vendor,
1095 id->id.product, id->id.version);
1097 len += input_print_modalias_bits(buf + len, size - len,
1098 'e', id->evbit, 0, EV_MAX);
1099 len += input_print_modalias_bits(buf + len, size - len,
1100 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1101 len += input_print_modalias_bits(buf + len, size - len,
1102 'r', id->relbit, 0, REL_MAX);
1103 len += input_print_modalias_bits(buf + len, size - len,
1104 'a', id->absbit, 0, ABS_MAX);
1105 len += input_print_modalias_bits(buf + len, size - len,
1106 'm', id->mscbit, 0, MSC_MAX);
1107 len += input_print_modalias_bits(buf + len, size - len,
1108 'l', id->ledbit, 0, LED_MAX);
1109 len += input_print_modalias_bits(buf + len, size - len,
1110 's', id->sndbit, 0, SND_MAX);
1111 len += input_print_modalias_bits(buf + len, size - len,
1112 'f', id->ffbit, 0, FF_MAX);
1113 len += input_print_modalias_bits(buf + len, size - len,
1114 'w', id->swbit, 0, SW_MAX);
1117 len += snprintf(buf + len, max(size - len, 0), "\n");
1122 static ssize_t input_dev_show_modalias(struct device *dev,
1123 struct device_attribute *attr,
1126 struct input_dev *id = to_input_dev(dev);
1129 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1131 return min_t(int, len, PAGE_SIZE);
1133 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1135 static struct attribute *input_dev_attrs[] = {
1136 &dev_attr_name.attr,
1137 &dev_attr_phys.attr,
1138 &dev_attr_uniq.attr,
1139 &dev_attr_modalias.attr,
1143 static struct attribute_group input_dev_attr_group = {
1144 .attrs = input_dev_attrs,
1147 #define INPUT_DEV_ID_ATTR(name) \
1148 static ssize_t input_dev_show_id_##name(struct device *dev, \
1149 struct device_attribute *attr, \
1152 struct input_dev *input_dev = to_input_dev(dev); \
1153 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1155 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1157 INPUT_DEV_ID_ATTR(bustype);
1158 INPUT_DEV_ID_ATTR(vendor);
1159 INPUT_DEV_ID_ATTR(product);
1160 INPUT_DEV_ID_ATTR(version);
1162 static struct attribute *input_dev_id_attrs[] = {
1163 &dev_attr_bustype.attr,
1164 &dev_attr_vendor.attr,
1165 &dev_attr_product.attr,
1166 &dev_attr_version.attr,
1170 static struct attribute_group input_dev_id_attr_group = {
1172 .attrs = input_dev_id_attrs,
1175 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1176 int max, int add_cr)
1180 bool skip_empty = true;
1182 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1183 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1184 bitmap[i], skip_empty);
1188 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1193 * If no output was produced print a single 0.
1196 len = snprintf(buf, buf_size, "%d", 0);
1199 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1204 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1205 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1206 struct device_attribute *attr, \
1209 struct input_dev *input_dev = to_input_dev(dev); \
1210 int len = input_print_bitmap(buf, PAGE_SIZE, \
1211 input_dev->bm##bit, ev##_MAX, \
1213 return min_t(int, len, PAGE_SIZE); \
1215 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1217 INPUT_DEV_CAP_ATTR(EV, ev);
1218 INPUT_DEV_CAP_ATTR(KEY, key);
1219 INPUT_DEV_CAP_ATTR(REL, rel);
1220 INPUT_DEV_CAP_ATTR(ABS, abs);
1221 INPUT_DEV_CAP_ATTR(MSC, msc);
1222 INPUT_DEV_CAP_ATTR(LED, led);
1223 INPUT_DEV_CAP_ATTR(SND, snd);
1224 INPUT_DEV_CAP_ATTR(FF, ff);
1225 INPUT_DEV_CAP_ATTR(SW, sw);
1227 static struct attribute *input_dev_caps_attrs[] = {
1240 static struct attribute_group input_dev_caps_attr_group = {
1241 .name = "capabilities",
1242 .attrs = input_dev_caps_attrs,
1245 static const struct attribute_group *input_dev_attr_groups[] = {
1246 &input_dev_attr_group,
1247 &input_dev_id_attr_group,
1248 &input_dev_caps_attr_group,
1252 static void input_dev_release(struct device *device)
1254 struct input_dev *dev = to_input_dev(device);
1256 input_ff_destroy(dev);
1259 module_put(THIS_MODULE);
1263 * Input uevent interface - loading event handlers based on
1266 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1267 const char *name, unsigned long *bitmap, int max)
1271 if (add_uevent_var(env, "%s=", name))
1274 len = input_print_bitmap(&env->buf[env->buflen - 1],
1275 sizeof(env->buf) - env->buflen,
1276 bitmap, max, false);
1277 if (len >= (sizeof(env->buf) - env->buflen))
1284 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1285 struct input_dev *dev)
1289 if (add_uevent_var(env, "MODALIAS="))
1292 len = input_print_modalias(&env->buf[env->buflen - 1],
1293 sizeof(env->buf) - env->buflen,
1295 if (len >= (sizeof(env->buf) - env->buflen))
1302 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1304 int err = add_uevent_var(env, fmt, val); \
1309 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1311 int err = input_add_uevent_bm_var(env, name, bm, max); \
1316 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1318 int err = input_add_uevent_modalias_var(env, dev); \
1323 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1325 struct input_dev *dev = to_input_dev(device);
1327 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1328 dev->id.bustype, dev->id.vendor,
1329 dev->id.product, dev->id.version);
1331 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1333 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1335 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1337 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1338 if (test_bit(EV_KEY, dev->evbit))
1339 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1340 if (test_bit(EV_REL, dev->evbit))
1341 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1342 if (test_bit(EV_ABS, dev->evbit))
1343 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1344 if (test_bit(EV_MSC, dev->evbit))
1345 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1346 if (test_bit(EV_LED, dev->evbit))
1347 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1348 if (test_bit(EV_SND, dev->evbit))
1349 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1350 if (test_bit(EV_FF, dev->evbit))
1351 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1352 if (test_bit(EV_SW, dev->evbit))
1353 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1355 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1360 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1365 if (!test_bit(EV_##type, dev->evbit)) \
1368 for (i = 0; i < type##_MAX; i++) { \
1369 if (!test_bit(i, dev->bits##bit)) \
1372 active = test_bit(i, dev->bits); \
1373 if (!active && !on) \
1376 dev->event(dev, EV_##type, i, on ? active : 0); \
1381 static void input_dev_reset(struct input_dev *dev, bool activate)
1386 INPUT_DO_TOGGLE(dev, LED, led, activate);
1387 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1389 if (activate && test_bit(EV_REP, dev->evbit)) {
1390 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1391 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1395 static int input_dev_suspend(struct device *dev)
1397 struct input_dev *input_dev = to_input_dev(dev);
1399 mutex_lock(&input_dev->mutex);
1400 input_dev_reset(input_dev, false);
1401 mutex_unlock(&input_dev->mutex);
1406 static int input_dev_resume(struct device *dev)
1408 struct input_dev *input_dev = to_input_dev(dev);
1410 mutex_lock(&input_dev->mutex);
1411 input_dev_reset(input_dev, true);
1412 mutex_unlock(&input_dev->mutex);
1417 static const struct dev_pm_ops input_dev_pm_ops = {
1418 .suspend = input_dev_suspend,
1419 .resume = input_dev_resume,
1420 .poweroff = input_dev_suspend,
1421 .restore = input_dev_resume,
1423 #endif /* CONFIG_PM */
1425 static struct device_type input_dev_type = {
1426 .groups = input_dev_attr_groups,
1427 .release = input_dev_release,
1428 .uevent = input_dev_uevent,
1430 .pm = &input_dev_pm_ops,
1434 static char *input_devnode(struct device *dev, mode_t *mode)
1436 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1439 struct class input_class = {
1441 .devnode = input_devnode,
1443 EXPORT_SYMBOL_GPL(input_class);
1446 * input_allocate_device - allocate memory for new input device
1448 * Returns prepared struct input_dev or NULL.
1450 * NOTE: Use input_free_device() to free devices that have not been
1451 * registered; input_unregister_device() should be used for already
1452 * registered devices.
1454 struct input_dev *input_allocate_device(void)
1456 struct input_dev *dev;
1458 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1460 dev->dev.type = &input_dev_type;
1461 dev->dev.class = &input_class;
1462 device_initialize(&dev->dev);
1463 mutex_init(&dev->mutex);
1464 spin_lock_init(&dev->event_lock);
1465 INIT_LIST_HEAD(&dev->h_list);
1466 INIT_LIST_HEAD(&dev->node);
1468 __module_get(THIS_MODULE);
1473 EXPORT_SYMBOL(input_allocate_device);
1476 * input_free_device - free memory occupied by input_dev structure
1477 * @dev: input device to free
1479 * This function should only be used if input_register_device()
1480 * was not called yet or if it failed. Once device was registered
1481 * use input_unregister_device() and memory will be freed once last
1482 * reference to the device is dropped.
1484 * Device should be allocated by input_allocate_device().
1486 * NOTE: If there are references to the input device then memory
1487 * will not be freed until last reference is dropped.
1489 void input_free_device(struct input_dev *dev)
1492 input_put_device(dev);
1494 EXPORT_SYMBOL(input_free_device);
1497 * input_set_capability - mark device as capable of a certain event
1498 * @dev: device that is capable of emitting or accepting event
1499 * @type: type of the event (EV_KEY, EV_REL, etc...)
1502 * In addition to setting up corresponding bit in appropriate capability
1503 * bitmap the function also adjusts dev->evbit.
1505 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1509 __set_bit(code, dev->keybit);
1513 __set_bit(code, dev->relbit);
1517 __set_bit(code, dev->absbit);
1521 __set_bit(code, dev->mscbit);
1525 __set_bit(code, dev->swbit);
1529 __set_bit(code, dev->ledbit);
1533 __set_bit(code, dev->sndbit);
1537 __set_bit(code, dev->ffbit);
1546 "input_set_capability: unknown type %u (code %u)\n",
1552 __set_bit(type, dev->evbit);
1554 EXPORT_SYMBOL(input_set_capability);
1556 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1558 if (!test_bit(EV_##type, dev->evbit)) \
1559 memset(dev->bits##bit, 0, \
1560 sizeof(dev->bits##bit)); \
1563 static void input_cleanse_bitmasks(struct input_dev *dev)
1565 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1566 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1567 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1568 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1569 INPUT_CLEANSE_BITMASK(dev, LED, led);
1570 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1571 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1572 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1576 * input_register_device - register device with input core
1577 * @dev: device to be registered
1579 * This function registers device with input core. The device must be
1580 * allocated with input_allocate_device() and all it's capabilities
1581 * set up before registering.
1582 * If function fails the device must be freed with input_free_device().
1583 * Once device has been successfully registered it can be unregistered
1584 * with input_unregister_device(); input_free_device() should not be
1585 * called in this case.
1587 int input_register_device(struct input_dev *dev)
1589 static atomic_t input_no = ATOMIC_INIT(0);
1590 struct input_handler *handler;
1594 /* Every input device generates EV_SYN/SYN_REPORT events. */
1595 __set_bit(EV_SYN, dev->evbit);
1597 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1598 __clear_bit(KEY_RESERVED, dev->keybit);
1600 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1601 input_cleanse_bitmasks(dev);
1604 * If delay and period are pre-set by the driver, then autorepeating
1605 * is handled by the driver itself and we don't do it in input.c.
1607 init_timer(&dev->timer);
1608 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1609 dev->timer.data = (long) dev;
1610 dev->timer.function = input_repeat_key;
1611 dev->rep[REP_DELAY] = 250;
1612 dev->rep[REP_PERIOD] = 33;
1615 if (!dev->getkeycode)
1616 dev->getkeycode = input_default_getkeycode;
1618 if (!dev->setkeycode)
1619 dev->setkeycode = input_default_setkeycode;
1621 dev_set_name(&dev->dev, "input%ld",
1622 (unsigned long) atomic_inc_return(&input_no) - 1);
1624 error = device_add(&dev->dev);
1628 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1629 printk(KERN_INFO "input: %s as %s\n",
1630 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1633 error = mutex_lock_interruptible(&input_mutex);
1635 device_del(&dev->dev);
1639 list_add_tail(&dev->node, &input_dev_list);
1641 list_for_each_entry(handler, &input_handler_list, node)
1642 input_attach_handler(dev, handler);
1644 input_wakeup_procfs_readers();
1646 mutex_unlock(&input_mutex);
1650 EXPORT_SYMBOL(input_register_device);
1653 * input_unregister_device - unregister previously registered device
1654 * @dev: device to be unregistered
1656 * This function unregisters an input device. Once device is unregistered
1657 * the caller should not try to access it as it may get freed at any moment.
1659 void input_unregister_device(struct input_dev *dev)
1661 struct input_handle *handle, *next;
1663 input_disconnect_device(dev);
1665 mutex_lock(&input_mutex);
1667 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1668 handle->handler->disconnect(handle);
1669 WARN_ON(!list_empty(&dev->h_list));
1671 del_timer_sync(&dev->timer);
1672 list_del_init(&dev->node);
1674 input_wakeup_procfs_readers();
1676 mutex_unlock(&input_mutex);
1678 device_unregister(&dev->dev);
1680 EXPORT_SYMBOL(input_unregister_device);
1683 * input_register_handler - register a new input handler
1684 * @handler: handler to be registered
1686 * This function registers a new input handler (interface) for input
1687 * devices in the system and attaches it to all input devices that
1688 * are compatible with the handler.
1690 int input_register_handler(struct input_handler *handler)
1692 struct input_dev *dev;
1695 retval = mutex_lock_interruptible(&input_mutex);
1699 INIT_LIST_HEAD(&handler->h_list);
1701 if (handler->fops != NULL) {
1702 if (input_table[handler->minor >> 5]) {
1706 input_table[handler->minor >> 5] = handler;
1709 list_add_tail(&handler->node, &input_handler_list);
1711 list_for_each_entry(dev, &input_dev_list, node)
1712 input_attach_handler(dev, handler);
1714 input_wakeup_procfs_readers();
1717 mutex_unlock(&input_mutex);
1720 EXPORT_SYMBOL(input_register_handler);
1723 * input_unregister_handler - unregisters an input handler
1724 * @handler: handler to be unregistered
1726 * This function disconnects a handler from its input devices and
1727 * removes it from lists of known handlers.
1729 void input_unregister_handler(struct input_handler *handler)
1731 struct input_handle *handle, *next;
1733 mutex_lock(&input_mutex);
1735 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1736 handler->disconnect(handle);
1737 WARN_ON(!list_empty(&handler->h_list));
1739 list_del_init(&handler->node);
1741 if (handler->fops != NULL)
1742 input_table[handler->minor >> 5] = NULL;
1744 input_wakeup_procfs_readers();
1746 mutex_unlock(&input_mutex);
1748 EXPORT_SYMBOL(input_unregister_handler);
1751 * input_handler_for_each_handle - handle iterator
1752 * @handler: input handler to iterate
1753 * @data: data for the callback
1754 * @fn: function to be called for each handle
1756 * Iterate over @bus's list of devices, and call @fn for each, passing
1757 * it @data and stop when @fn returns a non-zero value. The function is
1758 * using RCU to traverse the list and therefore may be usind in atonic
1759 * contexts. The @fn callback is invoked from RCU critical section and
1760 * thus must not sleep.
1762 int input_handler_for_each_handle(struct input_handler *handler, void *data,
1763 int (*fn)(struct input_handle *, void *))
1765 struct input_handle *handle;
1770 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
1771 retval = fn(handle, data);
1780 EXPORT_SYMBOL(input_handler_for_each_handle);
1783 * input_register_handle - register a new input handle
1784 * @handle: handle to register
1786 * This function puts a new input handle onto device's
1787 * and handler's lists so that events can flow through
1788 * it once it is opened using input_open_device().
1790 * This function is supposed to be called from handler's
1793 int input_register_handle(struct input_handle *handle)
1795 struct input_handler *handler = handle->handler;
1796 struct input_dev *dev = handle->dev;
1800 * We take dev->mutex here to prevent race with
1801 * input_release_device().
1803 error = mutex_lock_interruptible(&dev->mutex);
1806 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1807 mutex_unlock(&dev->mutex);
1810 * Since we are supposed to be called from ->connect()
1811 * which is mutually exclusive with ->disconnect()
1812 * we can't be racing with input_unregister_handle()
1813 * and so separate lock is not needed here.
1815 list_add_tail_rcu(&handle->h_node, &handler->h_list);
1818 handler->start(handle);
1822 EXPORT_SYMBOL(input_register_handle);
1825 * input_unregister_handle - unregister an input handle
1826 * @handle: handle to unregister
1828 * This function removes input handle from device's
1829 * and handler's lists.
1831 * This function is supposed to be called from handler's
1832 * disconnect() method.
1834 void input_unregister_handle(struct input_handle *handle)
1836 struct input_dev *dev = handle->dev;
1838 list_del_rcu(&handle->h_node);
1841 * Take dev->mutex to prevent race with input_release_device().
1843 mutex_lock(&dev->mutex);
1844 list_del_rcu(&handle->d_node);
1845 mutex_unlock(&dev->mutex);
1849 EXPORT_SYMBOL(input_unregister_handle);
1851 static int input_open_file(struct inode *inode, struct file *file)
1853 struct input_handler *handler;
1854 const struct file_operations *old_fops, *new_fops = NULL;
1858 /* No load-on-demand here? */
1859 handler = input_table[iminor(inode) >> 5];
1860 if (!handler || !(new_fops = fops_get(handler->fops))) {
1866 * That's _really_ odd. Usually NULL ->open means "nothing special",
1867 * not "no device". Oh, well...
1869 if (!new_fops->open) {
1874 old_fops = file->f_op;
1875 file->f_op = new_fops;
1877 err = new_fops->open(inode, file);
1880 fops_put(file->f_op);
1881 file->f_op = fops_get(old_fops);
1889 static const struct file_operations input_fops = {
1890 .owner = THIS_MODULE,
1891 .open = input_open_file,
1894 static void __init input_init_abs_bypass(void)
1896 const unsigned int *p;
1898 for (p = input_abs_bypass_init_data; *p; p++)
1899 input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
1902 static int __init input_init(void)
1906 input_init_abs_bypass();
1908 err = class_register(&input_class);
1910 printk(KERN_ERR "input: unable to register input_dev class\n");
1914 err = input_proc_init();
1918 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1920 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1926 fail2: input_proc_exit();
1927 fail1: class_unregister(&input_class);
1931 static void __exit input_exit(void)
1934 unregister_chrdev(INPUT_MAJOR, "input");
1935 class_unregister(&input_class);
1938 subsys_initcall(input_init);
1939 module_exit(input_exit);