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 = {
52 static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
54 static LIST_HEAD(input_dev_list);
55 static LIST_HEAD(input_handler_list);
58 * input_mutex protects access to both input_dev_list and input_handler_list.
59 * This also causes input_[un]register_device and input_[un]register_handler
60 * be mutually exclusive which simplifies locking in drivers implementing
63 static DEFINE_MUTEX(input_mutex);
65 static struct input_handler *input_table[8];
67 static inline int is_event_supported(unsigned int code,
68 unsigned long *bm, unsigned int max)
70 return code <= max && test_bit(code, bm);
73 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
76 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
79 if (value > old_val - fuzz && value < old_val + fuzz)
80 return (old_val * 3 + value) / 4;
82 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
83 return (old_val + value) / 2;
90 * Pass event first through all filters and then, if event has not been
91 * filtered out, through all open handles. This function is called with
92 * dev->event_lock held and interrupts disabled.
94 static void input_pass_event(struct input_dev *dev,
95 unsigned int type, unsigned int code, int value)
97 struct input_handler *handler;
98 struct input_handle *handle;
102 handle = rcu_dereference(dev->grab);
104 handle->handler->event(handle, type, code, value);
106 bool filtered = false;
108 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
112 handler = handle->handler;
113 if (!handler->filter) {
117 handler->event(handle, type, code, value);
119 } else if (handler->filter(handle, type, code, value))
128 * Generate software autorepeat event. Note that we take
129 * dev->event_lock here to avoid racing with input_event
130 * which may cause keys get "stuck".
132 static void input_repeat_key(unsigned long data)
134 struct input_dev *dev = (void *) data;
137 spin_lock_irqsave(&dev->event_lock, flags);
139 if (test_bit(dev->repeat_key, dev->key) &&
140 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
142 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
146 * Only send SYN_REPORT if we are not in a middle
147 * of driver parsing a new hardware packet.
148 * Otherwise assume that the driver will send
149 * SYN_REPORT once it's done.
151 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
154 if (dev->rep[REP_PERIOD])
155 mod_timer(&dev->timer, jiffies +
156 msecs_to_jiffies(dev->rep[REP_PERIOD]));
159 spin_unlock_irqrestore(&dev->event_lock, flags);
162 static void input_start_autorepeat(struct input_dev *dev, int code)
164 if (test_bit(EV_REP, dev->evbit) &&
165 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
167 dev->repeat_key = code;
168 mod_timer(&dev->timer,
169 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
173 static void input_stop_autorepeat(struct input_dev *dev)
175 del_timer(&dev->timer);
178 #define INPUT_IGNORE_EVENT 0
179 #define INPUT_PASS_TO_HANDLERS 1
180 #define INPUT_PASS_TO_DEVICE 2
181 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
183 static void input_handle_event(struct input_dev *dev,
184 unsigned int type, unsigned int code, int value)
186 int disposition = INPUT_IGNORE_EVENT;
193 disposition = INPUT_PASS_TO_ALL;
199 disposition = INPUT_PASS_TO_HANDLERS;
204 disposition = INPUT_PASS_TO_HANDLERS;
210 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
211 !!test_bit(code, dev->key) != value) {
214 __change_bit(code, dev->key);
216 input_start_autorepeat(dev, code);
218 input_stop_autorepeat(dev);
221 disposition = INPUT_PASS_TO_HANDLERS;
226 if (is_event_supported(code, dev->swbit, SW_MAX) &&
227 !!test_bit(code, dev->sw) != value) {
229 __change_bit(code, dev->sw);
230 disposition = INPUT_PASS_TO_HANDLERS;
235 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
237 if (test_bit(code, input_abs_bypass)) {
238 disposition = INPUT_PASS_TO_HANDLERS;
242 value = input_defuzz_abs_event(value,
243 dev->abs[code], dev->absfuzz[code]);
245 if (dev->abs[code] != value) {
246 dev->abs[code] = value;
247 disposition = INPUT_PASS_TO_HANDLERS;
253 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
254 disposition = INPUT_PASS_TO_HANDLERS;
259 if (is_event_supported(code, dev->mscbit, MSC_MAX))
260 disposition = INPUT_PASS_TO_ALL;
265 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
266 !!test_bit(code, dev->led) != value) {
268 __change_bit(code, dev->led);
269 disposition = INPUT_PASS_TO_ALL;
274 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
276 if (!!test_bit(code, dev->snd) != !!value)
277 __change_bit(code, dev->snd);
278 disposition = INPUT_PASS_TO_ALL;
283 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
284 dev->rep[code] = value;
285 disposition = INPUT_PASS_TO_ALL;
291 disposition = INPUT_PASS_TO_ALL;
295 disposition = INPUT_PASS_TO_ALL;
299 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
302 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
303 dev->event(dev, type, code, value);
305 if (disposition & INPUT_PASS_TO_HANDLERS)
306 input_pass_event(dev, type, code, value);
310 * input_event() - report new input event
311 * @dev: device that generated the event
312 * @type: type of the event
314 * @value: value of the event
316 * This function should be used by drivers implementing various input
317 * devices to report input events. See also input_inject_event().
319 * NOTE: input_event() may be safely used right after input device was
320 * allocated with input_allocate_device(), even before it is registered
321 * with input_register_device(), but the event will not reach any of the
322 * input handlers. Such early invocation of input_event() may be used
323 * to 'seed' initial state of a switch or initial position of absolute
326 void input_event(struct input_dev *dev,
327 unsigned int type, unsigned int code, int value)
331 if (is_event_supported(type, dev->evbit, EV_MAX)) {
333 spin_lock_irqsave(&dev->event_lock, flags);
334 add_input_randomness(type, code, value);
335 input_handle_event(dev, type, code, value);
336 spin_unlock_irqrestore(&dev->event_lock, flags);
339 EXPORT_SYMBOL(input_event);
342 * input_inject_event() - send input event from input handler
343 * @handle: input handle to send event through
344 * @type: type of the event
346 * @value: value of the event
348 * Similar to input_event() but will ignore event if device is
349 * "grabbed" and handle injecting event is not the one that owns
352 void input_inject_event(struct input_handle *handle,
353 unsigned int type, unsigned int code, int value)
355 struct input_dev *dev = handle->dev;
356 struct input_handle *grab;
359 if (is_event_supported(type, dev->evbit, EV_MAX)) {
360 spin_lock_irqsave(&dev->event_lock, flags);
363 grab = rcu_dereference(dev->grab);
364 if (!grab || grab == handle)
365 input_handle_event(dev, type, code, value);
368 spin_unlock_irqrestore(&dev->event_lock, flags);
371 EXPORT_SYMBOL(input_inject_event);
374 * input_grab_device - grabs device for exclusive use
375 * @handle: input handle that wants to own the device
377 * When a device is grabbed by an input handle all events generated by
378 * the device are delivered only to this handle. Also events injected
379 * by other input handles are ignored while device is grabbed.
381 int input_grab_device(struct input_handle *handle)
383 struct input_dev *dev = handle->dev;
386 retval = mutex_lock_interruptible(&dev->mutex);
395 rcu_assign_pointer(dev->grab, handle);
399 mutex_unlock(&dev->mutex);
402 EXPORT_SYMBOL(input_grab_device);
404 static void __input_release_device(struct input_handle *handle)
406 struct input_dev *dev = handle->dev;
408 if (dev->grab == handle) {
409 rcu_assign_pointer(dev->grab, NULL);
410 /* Make sure input_pass_event() notices that grab is gone */
413 list_for_each_entry(handle, &dev->h_list, d_node)
414 if (handle->open && handle->handler->start)
415 handle->handler->start(handle);
420 * input_release_device - release previously grabbed device
421 * @handle: input handle that owns the device
423 * Releases previously grabbed device so that other input handles can
424 * start receiving input events. Upon release all handlers attached
425 * to the device have their start() method called so they have a change
426 * to synchronize device state with the rest of the system.
428 void input_release_device(struct input_handle *handle)
430 struct input_dev *dev = handle->dev;
432 mutex_lock(&dev->mutex);
433 __input_release_device(handle);
434 mutex_unlock(&dev->mutex);
436 EXPORT_SYMBOL(input_release_device);
439 * input_open_device - open input device
440 * @handle: handle through which device is being accessed
442 * This function should be called by input handlers when they
443 * want to start receive events from given input device.
445 int input_open_device(struct input_handle *handle)
447 struct input_dev *dev = handle->dev;
450 retval = mutex_lock_interruptible(&dev->mutex);
454 if (dev->going_away) {
461 if (!dev->users++ && dev->open)
462 retval = dev->open(dev);
466 if (!--handle->open) {
468 * Make sure we are not delivering any more events
469 * through this handle
476 mutex_unlock(&dev->mutex);
479 EXPORT_SYMBOL(input_open_device);
481 int input_flush_device(struct input_handle *handle, struct file *file)
483 struct input_dev *dev = handle->dev;
486 retval = mutex_lock_interruptible(&dev->mutex);
491 retval = dev->flush(dev, file);
493 mutex_unlock(&dev->mutex);
496 EXPORT_SYMBOL(input_flush_device);
499 * input_close_device - close input device
500 * @handle: handle through which device is being accessed
502 * This function should be called by input handlers when they
503 * want to stop receive events from given input device.
505 void input_close_device(struct input_handle *handle)
507 struct input_dev *dev = handle->dev;
509 mutex_lock(&dev->mutex);
511 __input_release_device(handle);
513 if (!--dev->users && dev->close)
516 if (!--handle->open) {
518 * synchronize_rcu() makes sure that input_pass_event()
519 * completed and that no more input events are delivered
520 * through this handle
525 mutex_unlock(&dev->mutex);
527 EXPORT_SYMBOL(input_close_device);
530 * Prepare device for unregistering
532 static void input_disconnect_device(struct input_dev *dev)
534 struct input_handle *handle;
538 * Mark device as going away. Note that we take dev->mutex here
539 * not to protect access to dev->going_away but rather to ensure
540 * that there are no threads in the middle of input_open_device()
542 mutex_lock(&dev->mutex);
543 dev->going_away = true;
544 mutex_unlock(&dev->mutex);
546 spin_lock_irq(&dev->event_lock);
549 * Simulate keyup events for all pressed keys so that handlers
550 * are not left with "stuck" keys. The driver may continue
551 * generate events even after we done here but they will not
552 * reach any handlers.
554 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
555 for (code = 0; code <= KEY_MAX; code++) {
556 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
557 __test_and_clear_bit(code, dev->key)) {
558 input_pass_event(dev, EV_KEY, code, 0);
561 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
564 list_for_each_entry(handle, &dev->h_list, d_node)
567 spin_unlock_irq(&dev->event_lock);
570 static int input_fetch_keycode(struct input_dev *dev, int scancode)
572 switch (dev->keycodesize) {
574 return ((u8 *)dev->keycode)[scancode];
577 return ((u16 *)dev->keycode)[scancode];
580 return ((u32 *)dev->keycode)[scancode];
584 static int input_default_getkeycode(struct input_dev *dev,
585 unsigned int scancode,
586 unsigned int *keycode)
588 if (!dev->keycodesize)
591 if (scancode >= dev->keycodemax)
594 *keycode = input_fetch_keycode(dev, scancode);
599 static int input_default_setkeycode(struct input_dev *dev,
600 unsigned int scancode,
601 unsigned int keycode)
606 if (scancode >= dev->keycodemax)
609 if (!dev->keycodesize)
612 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
615 switch (dev->keycodesize) {
617 u8 *k = (u8 *)dev->keycode;
618 old_keycode = k[scancode];
619 k[scancode] = keycode;
623 u16 *k = (u16 *)dev->keycode;
624 old_keycode = k[scancode];
625 k[scancode] = keycode;
629 u32 *k = (u32 *)dev->keycode;
630 old_keycode = k[scancode];
631 k[scancode] = keycode;
636 __clear_bit(old_keycode, dev->keybit);
637 __set_bit(keycode, dev->keybit);
639 for (i = 0; i < dev->keycodemax; i++) {
640 if (input_fetch_keycode(dev, i) == old_keycode) {
641 __set_bit(old_keycode, dev->keybit);
642 break; /* Setting the bit twice is useless, so break */
650 * input_get_keycode - retrieve keycode currently mapped to a given scancode
651 * @dev: input device which keymap is being queried
652 * @scancode: scancode (or its equivalent for device in question) for which
656 * This function should be called by anyone interested in retrieving current
657 * keymap. Presently keyboard and evdev handlers use it.
659 int input_get_keycode(struct input_dev *dev,
660 unsigned int scancode, unsigned int *keycode)
662 return dev->getkeycode(dev, scancode, keycode);
664 EXPORT_SYMBOL(input_get_keycode);
667 * input_get_keycode - assign new keycode to a given scancode
668 * @dev: input device which keymap is being updated
669 * @scancode: scancode (or its equivalent for device in question)
670 * @keycode: new keycode to be assigned to the scancode
672 * This function should be called by anyone needing to update current
673 * keymap. Presently keyboard and evdev handlers use it.
675 int input_set_keycode(struct input_dev *dev,
676 unsigned int scancode, unsigned int keycode)
682 if (keycode > KEY_MAX)
685 spin_lock_irqsave(&dev->event_lock, flags);
687 retval = dev->getkeycode(dev, scancode, &old_keycode);
691 retval = dev->setkeycode(dev, scancode, keycode);
695 /* Make sure KEY_RESERVED did not get enabled. */
696 __clear_bit(KEY_RESERVED, dev->keybit);
699 * Simulate keyup event if keycode is not present
700 * in the keymap anymore
702 if (test_bit(EV_KEY, dev->evbit) &&
703 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
704 __test_and_clear_bit(old_keycode, dev->key)) {
706 input_pass_event(dev, EV_KEY, old_keycode, 0);
708 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
712 spin_unlock_irqrestore(&dev->event_lock, flags);
716 EXPORT_SYMBOL(input_set_keycode);
718 #define MATCH_BIT(bit, max) \
719 for (i = 0; i < BITS_TO_LONGS(max); i++) \
720 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
722 if (i != BITS_TO_LONGS(max)) \
725 static const struct input_device_id *input_match_device(struct input_handler *handler,
726 struct input_dev *dev)
728 const struct input_device_id *id;
731 for (id = handler->id_table; id->flags || id->driver_info; id++) {
733 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
734 if (id->bustype != dev->id.bustype)
737 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
738 if (id->vendor != dev->id.vendor)
741 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
742 if (id->product != dev->id.product)
745 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
746 if (id->version != dev->id.version)
749 MATCH_BIT(evbit, EV_MAX);
750 MATCH_BIT(keybit, KEY_MAX);
751 MATCH_BIT(relbit, REL_MAX);
752 MATCH_BIT(absbit, ABS_MAX);
753 MATCH_BIT(mscbit, MSC_MAX);
754 MATCH_BIT(ledbit, LED_MAX);
755 MATCH_BIT(sndbit, SND_MAX);
756 MATCH_BIT(ffbit, FF_MAX);
757 MATCH_BIT(swbit, SW_MAX);
759 if (!handler->match || handler->match(handler, dev))
766 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
768 const struct input_device_id *id;
771 id = input_match_device(handler, dev);
775 error = handler->connect(handler, dev, id);
776 if (error && error != -ENODEV)
778 "input: failed to attach handler %s to device %s, "
780 handler->name, kobject_name(&dev->dev.kobj), error);
787 static int input_bits_to_string(char *buf, int buf_size,
788 unsigned long bits, bool skip_empty)
792 if (INPUT_COMPAT_TEST) {
793 u32 dword = bits >> 32;
794 if (dword || !skip_empty)
795 len += snprintf(buf, buf_size, "%x ", dword);
797 dword = bits & 0xffffffffUL;
798 if (dword || !skip_empty || len)
799 len += snprintf(buf + len, max(buf_size - len, 0),
802 if (bits || !skip_empty)
803 len += snprintf(buf, buf_size, "%lx", bits);
809 #else /* !CONFIG_COMPAT */
811 static int input_bits_to_string(char *buf, int buf_size,
812 unsigned long bits, bool skip_empty)
814 return bits || !skip_empty ?
815 snprintf(buf, buf_size, "%lx", bits) : 0;
820 #ifdef CONFIG_PROC_FS
822 static struct proc_dir_entry *proc_bus_input_dir;
823 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
824 static int input_devices_state;
826 static inline void input_wakeup_procfs_readers(void)
828 input_devices_state++;
829 wake_up(&input_devices_poll_wait);
832 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
834 poll_wait(file, &input_devices_poll_wait, wait);
835 if (file->f_version != input_devices_state) {
836 file->f_version = input_devices_state;
837 return POLLIN | POLLRDNORM;
843 union input_seq_state {
851 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
853 union input_seq_state *state = (union input_seq_state *)&seq->private;
856 /* We need to fit into seq->private pointer */
857 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
859 error = mutex_lock_interruptible(&input_mutex);
861 state->mutex_acquired = false;
862 return ERR_PTR(error);
865 state->mutex_acquired = true;
867 return seq_list_start(&input_dev_list, *pos);
870 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
872 return seq_list_next(v, &input_dev_list, pos);
875 static void input_seq_stop(struct seq_file *seq, void *v)
877 union input_seq_state *state = (union input_seq_state *)&seq->private;
879 if (state->mutex_acquired)
880 mutex_unlock(&input_mutex);
883 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
884 unsigned long *bitmap, int max)
887 bool skip_empty = true;
890 seq_printf(seq, "B: %s=", name);
892 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
893 if (input_bits_to_string(buf, sizeof(buf),
894 bitmap[i], skip_empty)) {
896 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
901 * If no output was produced print a single 0.
909 static int input_devices_seq_show(struct seq_file *seq, void *v)
911 struct input_dev *dev = container_of(v, struct input_dev, node);
912 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
913 struct input_handle *handle;
915 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
916 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
918 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
919 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
920 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
921 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
922 seq_printf(seq, "H: Handlers=");
924 list_for_each_entry(handle, &dev->h_list, d_node)
925 seq_printf(seq, "%s ", handle->name);
928 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
929 if (test_bit(EV_KEY, dev->evbit))
930 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
931 if (test_bit(EV_REL, dev->evbit))
932 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
933 if (test_bit(EV_ABS, dev->evbit))
934 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
935 if (test_bit(EV_MSC, dev->evbit))
936 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
937 if (test_bit(EV_LED, dev->evbit))
938 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
939 if (test_bit(EV_SND, dev->evbit))
940 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
941 if (test_bit(EV_FF, dev->evbit))
942 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
943 if (test_bit(EV_SW, dev->evbit))
944 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
952 static const struct seq_operations input_devices_seq_ops = {
953 .start = input_devices_seq_start,
954 .next = input_devices_seq_next,
955 .stop = input_seq_stop,
956 .show = input_devices_seq_show,
959 static int input_proc_devices_open(struct inode *inode, struct file *file)
961 return seq_open(file, &input_devices_seq_ops);
964 static const struct file_operations input_devices_fileops = {
965 .owner = THIS_MODULE,
966 .open = input_proc_devices_open,
967 .poll = input_proc_devices_poll,
970 .release = seq_release,
973 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
975 union input_seq_state *state = (union input_seq_state *)&seq->private;
978 /* We need to fit into seq->private pointer */
979 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
981 error = mutex_lock_interruptible(&input_mutex);
983 state->mutex_acquired = false;
984 return ERR_PTR(error);
987 state->mutex_acquired = true;
990 return seq_list_start(&input_handler_list, *pos);
993 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
995 union input_seq_state *state = (union input_seq_state *)&seq->private;
997 state->pos = *pos + 1;
998 return seq_list_next(v, &input_handler_list, pos);
1001 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1003 struct input_handler *handler = container_of(v, struct input_handler, node);
1004 union input_seq_state *state = (union input_seq_state *)&seq->private;
1006 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1007 if (handler->filter)
1008 seq_puts(seq, " (filter)");
1010 seq_printf(seq, " Minor=%d", handler->minor);
1011 seq_putc(seq, '\n');
1016 static const struct seq_operations input_handlers_seq_ops = {
1017 .start = input_handlers_seq_start,
1018 .next = input_handlers_seq_next,
1019 .stop = input_seq_stop,
1020 .show = input_handlers_seq_show,
1023 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1025 return seq_open(file, &input_handlers_seq_ops);
1028 static const struct file_operations input_handlers_fileops = {
1029 .owner = THIS_MODULE,
1030 .open = input_proc_handlers_open,
1032 .llseek = seq_lseek,
1033 .release = seq_release,
1036 static int __init input_proc_init(void)
1038 struct proc_dir_entry *entry;
1040 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1041 if (!proc_bus_input_dir)
1044 entry = proc_create("devices", 0, proc_bus_input_dir,
1045 &input_devices_fileops);
1049 entry = proc_create("handlers", 0, proc_bus_input_dir,
1050 &input_handlers_fileops);
1056 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1057 fail1: remove_proc_entry("bus/input", NULL);
1061 static void input_proc_exit(void)
1063 remove_proc_entry("devices", proc_bus_input_dir);
1064 remove_proc_entry("handlers", proc_bus_input_dir);
1065 remove_proc_entry("bus/input", NULL);
1068 #else /* !CONFIG_PROC_FS */
1069 static inline void input_wakeup_procfs_readers(void) { }
1070 static inline int input_proc_init(void) { return 0; }
1071 static inline void input_proc_exit(void) { }
1074 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1075 static ssize_t input_dev_show_##name(struct device *dev, \
1076 struct device_attribute *attr, \
1079 struct input_dev *input_dev = to_input_dev(dev); \
1081 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1082 input_dev->name ? input_dev->name : ""); \
1084 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1086 INPUT_DEV_STRING_ATTR_SHOW(name);
1087 INPUT_DEV_STRING_ATTR_SHOW(phys);
1088 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1090 static int input_print_modalias_bits(char *buf, int size,
1091 char name, unsigned long *bm,
1092 unsigned int min_bit, unsigned int max_bit)
1096 len += snprintf(buf, max(size, 0), "%c", name);
1097 for (i = min_bit; i < max_bit; i++)
1098 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1099 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1103 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1108 len = snprintf(buf, max(size, 0),
1109 "input:b%04Xv%04Xp%04Xe%04X-",
1110 id->id.bustype, id->id.vendor,
1111 id->id.product, id->id.version);
1113 len += input_print_modalias_bits(buf + len, size - len,
1114 'e', id->evbit, 0, EV_MAX);
1115 len += input_print_modalias_bits(buf + len, size - len,
1116 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1117 len += input_print_modalias_bits(buf + len, size - len,
1118 'r', id->relbit, 0, REL_MAX);
1119 len += input_print_modalias_bits(buf + len, size - len,
1120 'a', id->absbit, 0, ABS_MAX);
1121 len += input_print_modalias_bits(buf + len, size - len,
1122 'm', id->mscbit, 0, MSC_MAX);
1123 len += input_print_modalias_bits(buf + len, size - len,
1124 'l', id->ledbit, 0, LED_MAX);
1125 len += input_print_modalias_bits(buf + len, size - len,
1126 's', id->sndbit, 0, SND_MAX);
1127 len += input_print_modalias_bits(buf + len, size - len,
1128 'f', id->ffbit, 0, FF_MAX);
1129 len += input_print_modalias_bits(buf + len, size - len,
1130 'w', id->swbit, 0, SW_MAX);
1133 len += snprintf(buf + len, max(size - len, 0), "\n");
1138 static ssize_t input_dev_show_modalias(struct device *dev,
1139 struct device_attribute *attr,
1142 struct input_dev *id = to_input_dev(dev);
1145 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1147 return min_t(int, len, PAGE_SIZE);
1149 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1151 static struct attribute *input_dev_attrs[] = {
1152 &dev_attr_name.attr,
1153 &dev_attr_phys.attr,
1154 &dev_attr_uniq.attr,
1155 &dev_attr_modalias.attr,
1159 static struct attribute_group input_dev_attr_group = {
1160 .attrs = input_dev_attrs,
1163 #define INPUT_DEV_ID_ATTR(name) \
1164 static ssize_t input_dev_show_id_##name(struct device *dev, \
1165 struct device_attribute *attr, \
1168 struct input_dev *input_dev = to_input_dev(dev); \
1169 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1171 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1173 INPUT_DEV_ID_ATTR(bustype);
1174 INPUT_DEV_ID_ATTR(vendor);
1175 INPUT_DEV_ID_ATTR(product);
1176 INPUT_DEV_ID_ATTR(version);
1178 static struct attribute *input_dev_id_attrs[] = {
1179 &dev_attr_bustype.attr,
1180 &dev_attr_vendor.attr,
1181 &dev_attr_product.attr,
1182 &dev_attr_version.attr,
1186 static struct attribute_group input_dev_id_attr_group = {
1188 .attrs = input_dev_id_attrs,
1191 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1192 int max, int add_cr)
1196 bool skip_empty = true;
1198 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1199 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1200 bitmap[i], skip_empty);
1204 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1209 * If no output was produced print a single 0.
1212 len = snprintf(buf, buf_size, "%d", 0);
1215 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1220 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1221 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1222 struct device_attribute *attr, \
1225 struct input_dev *input_dev = to_input_dev(dev); \
1226 int len = input_print_bitmap(buf, PAGE_SIZE, \
1227 input_dev->bm##bit, ev##_MAX, \
1229 return min_t(int, len, PAGE_SIZE); \
1231 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1233 INPUT_DEV_CAP_ATTR(EV, ev);
1234 INPUT_DEV_CAP_ATTR(KEY, key);
1235 INPUT_DEV_CAP_ATTR(REL, rel);
1236 INPUT_DEV_CAP_ATTR(ABS, abs);
1237 INPUT_DEV_CAP_ATTR(MSC, msc);
1238 INPUT_DEV_CAP_ATTR(LED, led);
1239 INPUT_DEV_CAP_ATTR(SND, snd);
1240 INPUT_DEV_CAP_ATTR(FF, ff);
1241 INPUT_DEV_CAP_ATTR(SW, sw);
1243 static struct attribute *input_dev_caps_attrs[] = {
1256 static struct attribute_group input_dev_caps_attr_group = {
1257 .name = "capabilities",
1258 .attrs = input_dev_caps_attrs,
1261 static const struct attribute_group *input_dev_attr_groups[] = {
1262 &input_dev_attr_group,
1263 &input_dev_id_attr_group,
1264 &input_dev_caps_attr_group,
1268 static void input_dev_release(struct device *device)
1270 struct input_dev *dev = to_input_dev(device);
1272 input_ff_destroy(dev);
1275 module_put(THIS_MODULE);
1279 * Input uevent interface - loading event handlers based on
1282 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1283 const char *name, unsigned long *bitmap, int max)
1287 if (add_uevent_var(env, "%s=", name))
1290 len = input_print_bitmap(&env->buf[env->buflen - 1],
1291 sizeof(env->buf) - env->buflen,
1292 bitmap, max, false);
1293 if (len >= (sizeof(env->buf) - env->buflen))
1300 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1301 struct input_dev *dev)
1305 if (add_uevent_var(env, "MODALIAS="))
1308 len = input_print_modalias(&env->buf[env->buflen - 1],
1309 sizeof(env->buf) - env->buflen,
1311 if (len >= (sizeof(env->buf) - env->buflen))
1318 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1320 int err = add_uevent_var(env, fmt, val); \
1325 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1327 int err = input_add_uevent_bm_var(env, name, bm, max); \
1332 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1334 int err = input_add_uevent_modalias_var(env, dev); \
1339 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1341 struct input_dev *dev = to_input_dev(device);
1343 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1344 dev->id.bustype, dev->id.vendor,
1345 dev->id.product, dev->id.version);
1347 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1349 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1351 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1353 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1354 if (test_bit(EV_KEY, dev->evbit))
1355 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1356 if (test_bit(EV_REL, dev->evbit))
1357 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1358 if (test_bit(EV_ABS, dev->evbit))
1359 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1360 if (test_bit(EV_MSC, dev->evbit))
1361 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1362 if (test_bit(EV_LED, dev->evbit))
1363 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1364 if (test_bit(EV_SND, dev->evbit))
1365 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1366 if (test_bit(EV_FF, dev->evbit))
1367 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1368 if (test_bit(EV_SW, dev->evbit))
1369 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1371 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1376 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1381 if (!test_bit(EV_##type, dev->evbit)) \
1384 for (i = 0; i < type##_MAX; i++) { \
1385 if (!test_bit(i, dev->bits##bit)) \
1388 active = test_bit(i, dev->bits); \
1389 if (!active && !on) \
1392 dev->event(dev, EV_##type, i, on ? active : 0); \
1397 static void input_dev_reset(struct input_dev *dev, bool activate)
1402 INPUT_DO_TOGGLE(dev, LED, led, activate);
1403 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1405 if (activate && test_bit(EV_REP, dev->evbit)) {
1406 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1407 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1411 static int input_dev_suspend(struct device *dev)
1413 struct input_dev *input_dev = to_input_dev(dev);
1415 mutex_lock(&input_dev->mutex);
1416 input_dev_reset(input_dev, false);
1417 mutex_unlock(&input_dev->mutex);
1422 static int input_dev_resume(struct device *dev)
1424 struct input_dev *input_dev = to_input_dev(dev);
1426 mutex_lock(&input_dev->mutex);
1427 input_dev_reset(input_dev, true);
1428 mutex_unlock(&input_dev->mutex);
1433 static const struct dev_pm_ops input_dev_pm_ops = {
1434 .suspend = input_dev_suspend,
1435 .resume = input_dev_resume,
1436 .poweroff = input_dev_suspend,
1437 .restore = input_dev_resume,
1439 #endif /* CONFIG_PM */
1441 static struct device_type input_dev_type = {
1442 .groups = input_dev_attr_groups,
1443 .release = input_dev_release,
1444 .uevent = input_dev_uevent,
1446 .pm = &input_dev_pm_ops,
1450 static char *input_devnode(struct device *dev, mode_t *mode)
1452 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1455 struct class input_class = {
1457 .devnode = input_devnode,
1459 EXPORT_SYMBOL_GPL(input_class);
1462 * input_allocate_device - allocate memory for new input device
1464 * Returns prepared struct input_dev or NULL.
1466 * NOTE: Use input_free_device() to free devices that have not been
1467 * registered; input_unregister_device() should be used for already
1468 * registered devices.
1470 struct input_dev *input_allocate_device(void)
1472 struct input_dev *dev;
1474 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1476 dev->dev.type = &input_dev_type;
1477 dev->dev.class = &input_class;
1478 device_initialize(&dev->dev);
1479 mutex_init(&dev->mutex);
1480 spin_lock_init(&dev->event_lock);
1481 INIT_LIST_HEAD(&dev->h_list);
1482 INIT_LIST_HEAD(&dev->node);
1484 __module_get(THIS_MODULE);
1489 EXPORT_SYMBOL(input_allocate_device);
1492 * input_free_device - free memory occupied by input_dev structure
1493 * @dev: input device to free
1495 * This function should only be used if input_register_device()
1496 * was not called yet or if it failed. Once device was registered
1497 * use input_unregister_device() and memory will be freed once last
1498 * reference to the device is dropped.
1500 * Device should be allocated by input_allocate_device().
1502 * NOTE: If there are references to the input device then memory
1503 * will not be freed until last reference is dropped.
1505 void input_free_device(struct input_dev *dev)
1508 input_put_device(dev);
1510 EXPORT_SYMBOL(input_free_device);
1513 * input_set_capability - mark device as capable of a certain event
1514 * @dev: device that is capable of emitting or accepting event
1515 * @type: type of the event (EV_KEY, EV_REL, etc...)
1518 * In addition to setting up corresponding bit in appropriate capability
1519 * bitmap the function also adjusts dev->evbit.
1521 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1525 __set_bit(code, dev->keybit);
1529 __set_bit(code, dev->relbit);
1533 __set_bit(code, dev->absbit);
1537 __set_bit(code, dev->mscbit);
1541 __set_bit(code, dev->swbit);
1545 __set_bit(code, dev->ledbit);
1549 __set_bit(code, dev->sndbit);
1553 __set_bit(code, dev->ffbit);
1562 "input_set_capability: unknown type %u (code %u)\n",
1568 __set_bit(type, dev->evbit);
1570 EXPORT_SYMBOL(input_set_capability);
1572 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1574 if (!test_bit(EV_##type, dev->evbit)) \
1575 memset(dev->bits##bit, 0, \
1576 sizeof(dev->bits##bit)); \
1579 static void input_cleanse_bitmasks(struct input_dev *dev)
1581 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1582 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1583 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1584 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1585 INPUT_CLEANSE_BITMASK(dev, LED, led);
1586 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1587 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1588 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1592 * input_register_device - register device with input core
1593 * @dev: device to be registered
1595 * This function registers device with input core. The device must be
1596 * allocated with input_allocate_device() and all it's capabilities
1597 * set up before registering.
1598 * If function fails the device must be freed with input_free_device().
1599 * Once device has been successfully registered it can be unregistered
1600 * with input_unregister_device(); input_free_device() should not be
1601 * called in this case.
1603 int input_register_device(struct input_dev *dev)
1605 static atomic_t input_no = ATOMIC_INIT(0);
1606 struct input_handler *handler;
1610 /* Every input device generates EV_SYN/SYN_REPORT events. */
1611 __set_bit(EV_SYN, dev->evbit);
1613 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1614 __clear_bit(KEY_RESERVED, dev->keybit);
1616 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1617 input_cleanse_bitmasks(dev);
1620 * If delay and period are pre-set by the driver, then autorepeating
1621 * is handled by the driver itself and we don't do it in input.c.
1623 init_timer(&dev->timer);
1624 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1625 dev->timer.data = (long) dev;
1626 dev->timer.function = input_repeat_key;
1627 dev->rep[REP_DELAY] = 250;
1628 dev->rep[REP_PERIOD] = 33;
1631 if (!dev->getkeycode)
1632 dev->getkeycode = input_default_getkeycode;
1634 if (!dev->setkeycode)
1635 dev->setkeycode = input_default_setkeycode;
1637 dev_set_name(&dev->dev, "input%ld",
1638 (unsigned long) atomic_inc_return(&input_no) - 1);
1640 error = device_add(&dev->dev);
1644 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1645 printk(KERN_INFO "input: %s as %s\n",
1646 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1649 error = mutex_lock_interruptible(&input_mutex);
1651 device_del(&dev->dev);
1655 list_add_tail(&dev->node, &input_dev_list);
1657 list_for_each_entry(handler, &input_handler_list, node)
1658 input_attach_handler(dev, handler);
1660 input_wakeup_procfs_readers();
1662 mutex_unlock(&input_mutex);
1666 EXPORT_SYMBOL(input_register_device);
1669 * input_unregister_device - unregister previously registered device
1670 * @dev: device to be unregistered
1672 * This function unregisters an input device. Once device is unregistered
1673 * the caller should not try to access it as it may get freed at any moment.
1675 void input_unregister_device(struct input_dev *dev)
1677 struct input_handle *handle, *next;
1679 input_disconnect_device(dev);
1681 mutex_lock(&input_mutex);
1683 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1684 handle->handler->disconnect(handle);
1685 WARN_ON(!list_empty(&dev->h_list));
1687 del_timer_sync(&dev->timer);
1688 list_del_init(&dev->node);
1690 input_wakeup_procfs_readers();
1692 mutex_unlock(&input_mutex);
1694 device_unregister(&dev->dev);
1696 EXPORT_SYMBOL(input_unregister_device);
1699 * input_register_handler - register a new input handler
1700 * @handler: handler to be registered
1702 * This function registers a new input handler (interface) for input
1703 * devices in the system and attaches it to all input devices that
1704 * are compatible with the handler.
1706 int input_register_handler(struct input_handler *handler)
1708 struct input_dev *dev;
1711 retval = mutex_lock_interruptible(&input_mutex);
1715 INIT_LIST_HEAD(&handler->h_list);
1717 if (handler->fops != NULL) {
1718 if (input_table[handler->minor >> 5]) {
1722 input_table[handler->minor >> 5] = handler;
1725 list_add_tail(&handler->node, &input_handler_list);
1727 list_for_each_entry(dev, &input_dev_list, node)
1728 input_attach_handler(dev, handler);
1730 input_wakeup_procfs_readers();
1733 mutex_unlock(&input_mutex);
1736 EXPORT_SYMBOL(input_register_handler);
1739 * input_unregister_handler - unregisters an input handler
1740 * @handler: handler to be unregistered
1742 * This function disconnects a handler from its input devices and
1743 * removes it from lists of known handlers.
1745 void input_unregister_handler(struct input_handler *handler)
1747 struct input_handle *handle, *next;
1749 mutex_lock(&input_mutex);
1751 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1752 handler->disconnect(handle);
1753 WARN_ON(!list_empty(&handler->h_list));
1755 list_del_init(&handler->node);
1757 if (handler->fops != NULL)
1758 input_table[handler->minor >> 5] = NULL;
1760 input_wakeup_procfs_readers();
1762 mutex_unlock(&input_mutex);
1764 EXPORT_SYMBOL(input_unregister_handler);
1767 * input_handler_for_each_handle - handle iterator
1768 * @handler: input handler to iterate
1769 * @data: data for the callback
1770 * @fn: function to be called for each handle
1772 * Iterate over @bus's list of devices, and call @fn for each, passing
1773 * it @data and stop when @fn returns a non-zero value. The function is
1774 * using RCU to traverse the list and therefore may be usind in atonic
1775 * contexts. The @fn callback is invoked from RCU critical section and
1776 * thus must not sleep.
1778 int input_handler_for_each_handle(struct input_handler *handler, void *data,
1779 int (*fn)(struct input_handle *, void *))
1781 struct input_handle *handle;
1786 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
1787 retval = fn(handle, data);
1796 EXPORT_SYMBOL(input_handler_for_each_handle);
1799 * input_register_handle - register a new input handle
1800 * @handle: handle to register
1802 * This function puts a new input handle onto device's
1803 * and handler's lists so that events can flow through
1804 * it once it is opened using input_open_device().
1806 * This function is supposed to be called from handler's
1809 int input_register_handle(struct input_handle *handle)
1811 struct input_handler *handler = handle->handler;
1812 struct input_dev *dev = handle->dev;
1816 * We take dev->mutex here to prevent race with
1817 * input_release_device().
1819 error = mutex_lock_interruptible(&dev->mutex);
1824 * Filters go to the head of the list, normal handlers
1827 if (handler->filter)
1828 list_add_rcu(&handle->d_node, &dev->h_list);
1830 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1832 mutex_unlock(&dev->mutex);
1835 * Since we are supposed to be called from ->connect()
1836 * which is mutually exclusive with ->disconnect()
1837 * we can't be racing with input_unregister_handle()
1838 * and so separate lock is not needed here.
1840 list_add_tail_rcu(&handle->h_node, &handler->h_list);
1843 handler->start(handle);
1847 EXPORT_SYMBOL(input_register_handle);
1850 * input_unregister_handle - unregister an input handle
1851 * @handle: handle to unregister
1853 * This function removes input handle from device's
1854 * and handler's lists.
1856 * This function is supposed to be called from handler's
1857 * disconnect() method.
1859 void input_unregister_handle(struct input_handle *handle)
1861 struct input_dev *dev = handle->dev;
1863 list_del_rcu(&handle->h_node);
1866 * Take dev->mutex to prevent race with input_release_device().
1868 mutex_lock(&dev->mutex);
1869 list_del_rcu(&handle->d_node);
1870 mutex_unlock(&dev->mutex);
1874 EXPORT_SYMBOL(input_unregister_handle);
1876 static int input_open_file(struct inode *inode, struct file *file)
1878 struct input_handler *handler;
1879 const struct file_operations *old_fops, *new_fops = NULL;
1882 err = mutex_lock_interruptible(&input_mutex);
1886 /* No load-on-demand here? */
1887 handler = input_table[iminor(inode) >> 5];
1889 new_fops = fops_get(handler->fops);
1891 mutex_unlock(&input_mutex);
1894 * That's _really_ odd. Usually NULL ->open means "nothing special",
1895 * not "no device". Oh, well...
1897 if (!new_fops || !new_fops->open) {
1903 old_fops = file->f_op;
1904 file->f_op = new_fops;
1906 err = new_fops->open(inode, file);
1908 fops_put(file->f_op);
1909 file->f_op = fops_get(old_fops);
1916 static const struct file_operations input_fops = {
1917 .owner = THIS_MODULE,
1918 .open = input_open_file,
1921 static void __init input_init_abs_bypass(void)
1923 const unsigned int *p;
1925 for (p = input_abs_bypass_init_data; *p; p++)
1926 input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
1929 static int __init input_init(void)
1933 input_init_abs_bypass();
1935 err = class_register(&input_class);
1937 printk(KERN_ERR "input: unable to register input_dev class\n");
1941 err = input_proc_init();
1945 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1947 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1953 fail2: input_proc_exit();
1954 fail1: class_unregister(&input_class);
1958 static void __exit input_exit(void)
1961 unregister_chrdev(INPUT_MAJOR, "input");
1962 class_unregister(&input_class);
1965 subsys_initcall(input_init);
1966 module_exit(input_exit);