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 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/input/mt.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/random.h>
21 #include <linux/major.h>
22 #include <linux/proc_fs.h>
23 #include <linux/sched.h>
24 #include <linux/seq_file.h>
25 #include <linux/poll.h>
26 #include <linux/device.h>
27 #include <linux/mutex.h>
28 #include <linux/rcupdate.h>
29 #include "input-compat.h"
31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
32 MODULE_DESCRIPTION("Input core");
33 MODULE_LICENSE("GPL");
35 #define INPUT_DEVICES 256
37 static LIST_HEAD(input_dev_list);
38 static LIST_HEAD(input_handler_list);
41 * input_mutex protects access to both input_dev_list and input_handler_list.
42 * This also causes input_[un]register_device and input_[un]register_handler
43 * be mutually exclusive which simplifies locking in drivers implementing
46 static DEFINE_MUTEX(input_mutex);
48 static struct input_handler *input_table[8];
50 static inline int is_event_supported(unsigned int code,
51 unsigned long *bm, unsigned int max)
53 return code <= max && test_bit(code, bm);
56 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
59 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
62 if (value > old_val - fuzz && value < old_val + fuzz)
63 return (old_val * 3 + value) / 4;
65 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
66 return (old_val + value) / 2;
72 static void input_start_autorepeat(struct input_dev *dev, int code)
74 if (test_bit(EV_REP, dev->evbit) &&
75 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
77 dev->repeat_key = code;
78 mod_timer(&dev->timer,
79 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
83 static void input_stop_autorepeat(struct input_dev *dev)
85 del_timer(&dev->timer);
89 * Pass event first through all filters and then, if event has not been
90 * filtered out, through all open handles. This function is called with
91 * dev->event_lock held and interrupts disabled.
93 static void input_pass_event(struct input_dev *dev,
94 unsigned int type, unsigned int code, int value)
96 struct input_handler *handler;
97 struct input_handle *handle;
101 handle = rcu_dereference(dev->grab);
103 handle->handler->event(handle, type, code, value);
105 bool filtered = false;
107 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
111 handler = handle->handler;
112 if (!handler->filter) {
116 handler->event(handle, type, code, value);
118 } else if (handler->filter(handle, type, code, value))
125 /* trigger auto repeat for key events */
126 if (type == EV_KEY && value != 2) {
128 input_start_autorepeat(dev, code);
130 input_stop_autorepeat(dev);
136 * Generate software autorepeat event. Note that we take
137 * dev->event_lock here to avoid racing with input_event
138 * which may cause keys get "stuck".
140 static void input_repeat_key(unsigned long data)
142 struct input_dev *dev = (void *) data;
145 spin_lock_irqsave(&dev->event_lock, flags);
147 if (test_bit(dev->repeat_key, dev->key) &&
148 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
150 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
154 * Only send SYN_REPORT if we are not in a middle
155 * of driver parsing a new hardware packet.
156 * Otherwise assume that the driver will send
157 * SYN_REPORT once it's done.
159 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
162 if (dev->rep[REP_PERIOD])
163 mod_timer(&dev->timer, jiffies +
164 msecs_to_jiffies(dev->rep[REP_PERIOD]));
167 spin_unlock_irqrestore(&dev->event_lock, flags);
170 #define INPUT_IGNORE_EVENT 0
171 #define INPUT_PASS_TO_HANDLERS 1
172 #define INPUT_PASS_TO_DEVICE 2
173 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
175 static int input_handle_abs_event(struct input_dev *dev,
176 unsigned int code, int *pval)
178 struct input_mt *mt = dev->mt;
182 if (code == ABS_MT_SLOT) {
184 * "Stage" the event; we'll flush it later, when we
185 * get actual touch data.
187 if (mt && *pval >= 0 && *pval < mt->num_slots)
190 return INPUT_IGNORE_EVENT;
193 is_mt_event = input_is_mt_value(code);
196 pold = &dev->absinfo[code].value;
198 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
201 * Bypass filtering for multi-touch events when
202 * not employing slots.
208 *pval = input_defuzz_abs_event(*pval, *pold,
209 dev->absinfo[code].fuzz);
211 return INPUT_IGNORE_EVENT;
216 /* Flush pending "slot" event */
217 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
218 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
219 input_pass_event(dev, EV_ABS, ABS_MT_SLOT, mt->slot);
222 return INPUT_PASS_TO_HANDLERS;
225 static void input_handle_event(struct input_dev *dev,
226 unsigned int type, unsigned int code, int value)
228 int disposition = INPUT_IGNORE_EVENT;
235 disposition = INPUT_PASS_TO_ALL;
241 disposition = INPUT_PASS_TO_HANDLERS;
246 disposition = INPUT_PASS_TO_HANDLERS;
252 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
254 /* auto-repeat bypasses state updates */
256 disposition = INPUT_PASS_TO_HANDLERS;
260 if (!!test_bit(code, dev->key) != !!value) {
262 __change_bit(code, dev->key);
263 disposition = INPUT_PASS_TO_HANDLERS;
269 if (is_event_supported(code, dev->swbit, SW_MAX) &&
270 !!test_bit(code, dev->sw) != !!value) {
272 __change_bit(code, dev->sw);
273 disposition = INPUT_PASS_TO_HANDLERS;
278 if (is_event_supported(code, dev->absbit, ABS_MAX))
279 disposition = input_handle_abs_event(dev, code, &value);
284 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
285 disposition = INPUT_PASS_TO_HANDLERS;
290 if (is_event_supported(code, dev->mscbit, MSC_MAX))
291 disposition = INPUT_PASS_TO_ALL;
296 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
297 !!test_bit(code, dev->led) != !!value) {
299 __change_bit(code, dev->led);
300 disposition = INPUT_PASS_TO_ALL;
305 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
307 if (!!test_bit(code, dev->snd) != !!value)
308 __change_bit(code, dev->snd);
309 disposition = INPUT_PASS_TO_ALL;
314 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
315 dev->rep[code] = value;
316 disposition = INPUT_PASS_TO_ALL;
322 disposition = INPUT_PASS_TO_ALL;
326 disposition = INPUT_PASS_TO_ALL;
330 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
333 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
334 dev->event(dev, type, code, value);
336 if (disposition & INPUT_PASS_TO_HANDLERS)
337 input_pass_event(dev, type, code, value);
341 * input_event() - report new input event
342 * @dev: device that generated the event
343 * @type: type of the event
345 * @value: value of the event
347 * This function should be used by drivers implementing various input
348 * devices to report input events. See also input_inject_event().
350 * NOTE: input_event() may be safely used right after input device was
351 * allocated with input_allocate_device(), even before it is registered
352 * with input_register_device(), but the event will not reach any of the
353 * input handlers. Such early invocation of input_event() may be used
354 * to 'seed' initial state of a switch or initial position of absolute
357 void input_event(struct input_dev *dev,
358 unsigned int type, unsigned int code, int value)
362 if (is_event_supported(type, dev->evbit, EV_MAX)) {
364 spin_lock_irqsave(&dev->event_lock, flags);
365 add_input_randomness(type, code, value);
366 input_handle_event(dev, type, code, value);
367 spin_unlock_irqrestore(&dev->event_lock, flags);
370 EXPORT_SYMBOL(input_event);
373 * input_inject_event() - send input event from input handler
374 * @handle: input handle to send event through
375 * @type: type of the event
377 * @value: value of the event
379 * Similar to input_event() but will ignore event if device is
380 * "grabbed" and handle injecting event is not the one that owns
383 void input_inject_event(struct input_handle *handle,
384 unsigned int type, unsigned int code, int value)
386 struct input_dev *dev = handle->dev;
387 struct input_handle *grab;
390 if (is_event_supported(type, dev->evbit, EV_MAX)) {
391 spin_lock_irqsave(&dev->event_lock, flags);
394 grab = rcu_dereference(dev->grab);
395 if (!grab || grab == handle)
396 input_handle_event(dev, type, code, value);
399 spin_unlock_irqrestore(&dev->event_lock, flags);
402 EXPORT_SYMBOL(input_inject_event);
405 * input_alloc_absinfo - allocates array of input_absinfo structs
406 * @dev: the input device emitting absolute events
408 * If the absinfo struct the caller asked for is already allocated, this
409 * functions will not do anything.
411 void input_alloc_absinfo(struct input_dev *dev)
414 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
417 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
419 EXPORT_SYMBOL(input_alloc_absinfo);
421 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
422 int min, int max, int fuzz, int flat)
424 struct input_absinfo *absinfo;
426 input_alloc_absinfo(dev);
430 absinfo = &dev->absinfo[axis];
431 absinfo->minimum = min;
432 absinfo->maximum = max;
433 absinfo->fuzz = fuzz;
434 absinfo->flat = flat;
436 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
438 EXPORT_SYMBOL(input_set_abs_params);
442 * input_grab_device - grabs device for exclusive use
443 * @handle: input handle that wants to own the device
445 * When a device is grabbed by an input handle all events generated by
446 * the device are delivered only to this handle. Also events injected
447 * by other input handles are ignored while device is grabbed.
449 int input_grab_device(struct input_handle *handle)
451 struct input_dev *dev = handle->dev;
454 retval = mutex_lock_interruptible(&dev->mutex);
463 rcu_assign_pointer(dev->grab, handle);
466 mutex_unlock(&dev->mutex);
469 EXPORT_SYMBOL(input_grab_device);
471 static void __input_release_device(struct input_handle *handle)
473 struct input_dev *dev = handle->dev;
475 if (dev->grab == handle) {
476 rcu_assign_pointer(dev->grab, NULL);
477 /* Make sure input_pass_event() notices that grab is gone */
480 list_for_each_entry(handle, &dev->h_list, d_node)
481 if (handle->open && handle->handler->start)
482 handle->handler->start(handle);
487 * input_release_device - release previously grabbed device
488 * @handle: input handle that owns the device
490 * Releases previously grabbed device so that other input handles can
491 * start receiving input events. Upon release all handlers attached
492 * to the device have their start() method called so they have a change
493 * to synchronize device state with the rest of the system.
495 void input_release_device(struct input_handle *handle)
497 struct input_dev *dev = handle->dev;
499 mutex_lock(&dev->mutex);
500 __input_release_device(handle);
501 mutex_unlock(&dev->mutex);
503 EXPORT_SYMBOL(input_release_device);
506 * input_open_device - open input device
507 * @handle: handle through which device is being accessed
509 * This function should be called by input handlers when they
510 * want to start receive events from given input device.
512 int input_open_device(struct input_handle *handle)
514 struct input_dev *dev = handle->dev;
517 retval = mutex_lock_interruptible(&dev->mutex);
521 if (dev->going_away) {
528 if (!dev->users++ && dev->open)
529 retval = dev->open(dev);
533 if (!--handle->open) {
535 * Make sure we are not delivering any more events
536 * through this handle
543 mutex_unlock(&dev->mutex);
546 EXPORT_SYMBOL(input_open_device);
548 int input_flush_device(struct input_handle *handle, struct file *file)
550 struct input_dev *dev = handle->dev;
553 retval = mutex_lock_interruptible(&dev->mutex);
558 retval = dev->flush(dev, file);
560 mutex_unlock(&dev->mutex);
563 EXPORT_SYMBOL(input_flush_device);
566 * input_close_device - close input device
567 * @handle: handle through which device is being accessed
569 * This function should be called by input handlers when they
570 * want to stop receive events from given input device.
572 void input_close_device(struct input_handle *handle)
574 struct input_dev *dev = handle->dev;
576 mutex_lock(&dev->mutex);
578 __input_release_device(handle);
580 if (!--dev->users && dev->close)
583 if (!--handle->open) {
585 * synchronize_rcu() makes sure that input_pass_event()
586 * completed and that no more input events are delivered
587 * through this handle
592 mutex_unlock(&dev->mutex);
594 EXPORT_SYMBOL(input_close_device);
597 * Simulate keyup events for all keys that are marked as pressed.
598 * The function must be called with dev->event_lock held.
600 static void input_dev_release_keys(struct input_dev *dev)
604 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
605 for (code = 0; code <= KEY_MAX; code++) {
606 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
607 __test_and_clear_bit(code, dev->key)) {
608 input_pass_event(dev, EV_KEY, code, 0);
611 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
616 * Prepare device for unregistering
618 static void input_disconnect_device(struct input_dev *dev)
620 struct input_handle *handle;
623 * Mark device as going away. Note that we take dev->mutex here
624 * not to protect access to dev->going_away but rather to ensure
625 * that there are no threads in the middle of input_open_device()
627 mutex_lock(&dev->mutex);
628 dev->going_away = true;
629 mutex_unlock(&dev->mutex);
631 spin_lock_irq(&dev->event_lock);
634 * Simulate keyup events for all pressed keys so that handlers
635 * are not left with "stuck" keys. The driver may continue
636 * generate events even after we done here but they will not
637 * reach any handlers.
639 input_dev_release_keys(dev);
641 list_for_each_entry(handle, &dev->h_list, d_node)
644 spin_unlock_irq(&dev->event_lock);
648 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
649 * @ke: keymap entry containing scancode to be converted.
650 * @scancode: pointer to the location where converted scancode should
653 * This function is used to convert scancode stored in &struct keymap_entry
654 * into scalar form understood by legacy keymap handling methods. These
655 * methods expect scancodes to be represented as 'unsigned int'.
657 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
658 unsigned int *scancode)
662 *scancode = *((u8 *)ke->scancode);
666 *scancode = *((u16 *)ke->scancode);
670 *scancode = *((u32 *)ke->scancode);
679 EXPORT_SYMBOL(input_scancode_to_scalar);
682 * Those routines handle the default case where no [gs]etkeycode() is
683 * defined. In this case, an array indexed by the scancode is used.
686 static unsigned int input_fetch_keycode(struct input_dev *dev,
689 switch (dev->keycodesize) {
691 return ((u8 *)dev->keycode)[index];
694 return ((u16 *)dev->keycode)[index];
697 return ((u32 *)dev->keycode)[index];
701 static int input_default_getkeycode(struct input_dev *dev,
702 struct input_keymap_entry *ke)
707 if (!dev->keycodesize)
710 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
713 error = input_scancode_to_scalar(ke, &index);
718 if (index >= dev->keycodemax)
721 ke->keycode = input_fetch_keycode(dev, index);
723 ke->len = sizeof(index);
724 memcpy(ke->scancode, &index, sizeof(index));
729 static int input_default_setkeycode(struct input_dev *dev,
730 const struct input_keymap_entry *ke,
731 unsigned int *old_keycode)
737 if (!dev->keycodesize)
740 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
743 error = input_scancode_to_scalar(ke, &index);
748 if (index >= dev->keycodemax)
751 if (dev->keycodesize < sizeof(ke->keycode) &&
752 (ke->keycode >> (dev->keycodesize * 8)))
755 switch (dev->keycodesize) {
757 u8 *k = (u8 *)dev->keycode;
758 *old_keycode = k[index];
759 k[index] = ke->keycode;
763 u16 *k = (u16 *)dev->keycode;
764 *old_keycode = k[index];
765 k[index] = ke->keycode;
769 u32 *k = (u32 *)dev->keycode;
770 *old_keycode = k[index];
771 k[index] = ke->keycode;
776 __clear_bit(*old_keycode, dev->keybit);
777 __set_bit(ke->keycode, dev->keybit);
779 for (i = 0; i < dev->keycodemax; i++) {
780 if (input_fetch_keycode(dev, i) == *old_keycode) {
781 __set_bit(*old_keycode, dev->keybit);
782 break; /* Setting the bit twice is useless, so break */
790 * input_get_keycode - retrieve keycode currently mapped to a given scancode
791 * @dev: input device which keymap is being queried
794 * This function should be called by anyone interested in retrieving current
795 * keymap. Presently evdev handlers use it.
797 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
802 spin_lock_irqsave(&dev->event_lock, flags);
803 retval = dev->getkeycode(dev, ke);
804 spin_unlock_irqrestore(&dev->event_lock, flags);
808 EXPORT_SYMBOL(input_get_keycode);
811 * input_set_keycode - attribute a keycode to a given scancode
812 * @dev: input device which keymap is being updated
813 * @ke: new keymap entry
815 * This function should be called by anyone needing to update current
816 * keymap. Presently keyboard and evdev handlers use it.
818 int input_set_keycode(struct input_dev *dev,
819 const struct input_keymap_entry *ke)
822 unsigned int old_keycode;
825 if (ke->keycode > KEY_MAX)
828 spin_lock_irqsave(&dev->event_lock, flags);
830 retval = dev->setkeycode(dev, ke, &old_keycode);
834 /* Make sure KEY_RESERVED did not get enabled. */
835 __clear_bit(KEY_RESERVED, dev->keybit);
838 * Simulate keyup event if keycode is not present
839 * in the keymap anymore
841 if (test_bit(EV_KEY, dev->evbit) &&
842 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
843 __test_and_clear_bit(old_keycode, dev->key)) {
845 input_pass_event(dev, EV_KEY, old_keycode, 0);
847 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
851 spin_unlock_irqrestore(&dev->event_lock, flags);
855 EXPORT_SYMBOL(input_set_keycode);
857 #define MATCH_BIT(bit, max) \
858 for (i = 0; i < BITS_TO_LONGS(max); i++) \
859 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
861 if (i != BITS_TO_LONGS(max)) \
864 static const struct input_device_id *input_match_device(struct input_handler *handler,
865 struct input_dev *dev)
867 const struct input_device_id *id;
870 for (id = handler->id_table; id->flags || id->driver_info; id++) {
872 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
873 if (id->bustype != dev->id.bustype)
876 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
877 if (id->vendor != dev->id.vendor)
880 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
881 if (id->product != dev->id.product)
884 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
885 if (id->version != dev->id.version)
888 MATCH_BIT(evbit, EV_MAX);
889 MATCH_BIT(keybit, KEY_MAX);
890 MATCH_BIT(relbit, REL_MAX);
891 MATCH_BIT(absbit, ABS_MAX);
892 MATCH_BIT(mscbit, MSC_MAX);
893 MATCH_BIT(ledbit, LED_MAX);
894 MATCH_BIT(sndbit, SND_MAX);
895 MATCH_BIT(ffbit, FF_MAX);
896 MATCH_BIT(swbit, SW_MAX);
898 if (!handler->match || handler->match(handler, dev))
905 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
907 const struct input_device_id *id;
910 id = input_match_device(handler, dev);
914 error = handler->connect(handler, dev, id);
915 if (error && error != -ENODEV)
916 pr_err("failed to attach handler %s to device %s, error: %d\n",
917 handler->name, kobject_name(&dev->dev.kobj), error);
924 static int input_bits_to_string(char *buf, int buf_size,
925 unsigned long bits, bool skip_empty)
929 if (INPUT_COMPAT_TEST) {
930 u32 dword = bits >> 32;
931 if (dword || !skip_empty)
932 len += snprintf(buf, buf_size, "%x ", dword);
934 dword = bits & 0xffffffffUL;
935 if (dword || !skip_empty || len)
936 len += snprintf(buf + len, max(buf_size - len, 0),
939 if (bits || !skip_empty)
940 len += snprintf(buf, buf_size, "%lx", bits);
946 #else /* !CONFIG_COMPAT */
948 static int input_bits_to_string(char *buf, int buf_size,
949 unsigned long bits, bool skip_empty)
951 return bits || !skip_empty ?
952 snprintf(buf, buf_size, "%lx", bits) : 0;
957 #ifdef CONFIG_PROC_FS
959 static struct proc_dir_entry *proc_bus_input_dir;
960 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
961 static int input_devices_state;
963 static inline void input_wakeup_procfs_readers(void)
965 input_devices_state++;
966 wake_up(&input_devices_poll_wait);
969 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
971 poll_wait(file, &input_devices_poll_wait, wait);
972 if (file->f_version != input_devices_state) {
973 file->f_version = input_devices_state;
974 return POLLIN | POLLRDNORM;
980 union input_seq_state {
988 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
990 union input_seq_state *state = (union input_seq_state *)&seq->private;
993 /* We need to fit into seq->private pointer */
994 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
996 error = mutex_lock_interruptible(&input_mutex);
998 state->mutex_acquired = false;
999 return ERR_PTR(error);
1002 state->mutex_acquired = true;
1004 return seq_list_start(&input_dev_list, *pos);
1007 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1009 return seq_list_next(v, &input_dev_list, pos);
1012 static void input_seq_stop(struct seq_file *seq, void *v)
1014 union input_seq_state *state = (union input_seq_state *)&seq->private;
1016 if (state->mutex_acquired)
1017 mutex_unlock(&input_mutex);
1020 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1021 unsigned long *bitmap, int max)
1024 bool skip_empty = true;
1027 seq_printf(seq, "B: %s=", name);
1029 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1030 if (input_bits_to_string(buf, sizeof(buf),
1031 bitmap[i], skip_empty)) {
1033 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1038 * If no output was produced print a single 0.
1043 seq_putc(seq, '\n');
1046 static int input_devices_seq_show(struct seq_file *seq, void *v)
1048 struct input_dev *dev = container_of(v, struct input_dev, node);
1049 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1050 struct input_handle *handle;
1052 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1053 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1055 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1056 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1057 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1058 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1059 seq_printf(seq, "H: Handlers=");
1061 list_for_each_entry(handle, &dev->h_list, d_node)
1062 seq_printf(seq, "%s ", handle->name);
1063 seq_putc(seq, '\n');
1065 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1067 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1068 if (test_bit(EV_KEY, dev->evbit))
1069 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1070 if (test_bit(EV_REL, dev->evbit))
1071 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1072 if (test_bit(EV_ABS, dev->evbit))
1073 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1074 if (test_bit(EV_MSC, dev->evbit))
1075 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1076 if (test_bit(EV_LED, dev->evbit))
1077 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1078 if (test_bit(EV_SND, dev->evbit))
1079 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1080 if (test_bit(EV_FF, dev->evbit))
1081 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1082 if (test_bit(EV_SW, dev->evbit))
1083 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1085 seq_putc(seq, '\n');
1091 static const struct seq_operations input_devices_seq_ops = {
1092 .start = input_devices_seq_start,
1093 .next = input_devices_seq_next,
1094 .stop = input_seq_stop,
1095 .show = input_devices_seq_show,
1098 static int input_proc_devices_open(struct inode *inode, struct file *file)
1100 return seq_open(file, &input_devices_seq_ops);
1103 static const struct file_operations input_devices_fileops = {
1104 .owner = THIS_MODULE,
1105 .open = input_proc_devices_open,
1106 .poll = input_proc_devices_poll,
1108 .llseek = seq_lseek,
1109 .release = seq_release,
1112 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1114 union input_seq_state *state = (union input_seq_state *)&seq->private;
1117 /* We need to fit into seq->private pointer */
1118 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1120 error = mutex_lock_interruptible(&input_mutex);
1122 state->mutex_acquired = false;
1123 return ERR_PTR(error);
1126 state->mutex_acquired = true;
1129 return seq_list_start(&input_handler_list, *pos);
1132 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1134 union input_seq_state *state = (union input_seq_state *)&seq->private;
1136 state->pos = *pos + 1;
1137 return seq_list_next(v, &input_handler_list, pos);
1140 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1142 struct input_handler *handler = container_of(v, struct input_handler, node);
1143 union input_seq_state *state = (union input_seq_state *)&seq->private;
1145 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1146 if (handler->filter)
1147 seq_puts(seq, " (filter)");
1149 seq_printf(seq, " Minor=%d", handler->minor);
1150 seq_putc(seq, '\n');
1155 static const struct seq_operations input_handlers_seq_ops = {
1156 .start = input_handlers_seq_start,
1157 .next = input_handlers_seq_next,
1158 .stop = input_seq_stop,
1159 .show = input_handlers_seq_show,
1162 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1164 return seq_open(file, &input_handlers_seq_ops);
1167 static const struct file_operations input_handlers_fileops = {
1168 .owner = THIS_MODULE,
1169 .open = input_proc_handlers_open,
1171 .llseek = seq_lseek,
1172 .release = seq_release,
1175 static int __init input_proc_init(void)
1177 struct proc_dir_entry *entry;
1179 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1180 if (!proc_bus_input_dir)
1183 entry = proc_create("devices", 0, proc_bus_input_dir,
1184 &input_devices_fileops);
1188 entry = proc_create("handlers", 0, proc_bus_input_dir,
1189 &input_handlers_fileops);
1195 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1196 fail1: remove_proc_entry("bus/input", NULL);
1200 static void input_proc_exit(void)
1202 remove_proc_entry("devices", proc_bus_input_dir);
1203 remove_proc_entry("handlers", proc_bus_input_dir);
1204 remove_proc_entry("bus/input", NULL);
1207 #else /* !CONFIG_PROC_FS */
1208 static inline void input_wakeup_procfs_readers(void) { }
1209 static inline int input_proc_init(void) { return 0; }
1210 static inline void input_proc_exit(void) { }
1213 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1214 static ssize_t input_dev_show_##name(struct device *dev, \
1215 struct device_attribute *attr, \
1218 struct input_dev *input_dev = to_input_dev(dev); \
1220 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1221 input_dev->name ? input_dev->name : ""); \
1223 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1225 INPUT_DEV_STRING_ATTR_SHOW(name);
1226 INPUT_DEV_STRING_ATTR_SHOW(phys);
1227 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1229 static int input_print_modalias_bits(char *buf, int size,
1230 char name, unsigned long *bm,
1231 unsigned int min_bit, unsigned int max_bit)
1235 len += snprintf(buf, max(size, 0), "%c", name);
1236 for (i = min_bit; i < max_bit; i++)
1237 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1238 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1242 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1247 len = snprintf(buf, max(size, 0),
1248 "input:b%04Xv%04Xp%04Xe%04X-",
1249 id->id.bustype, id->id.vendor,
1250 id->id.product, id->id.version);
1252 len += input_print_modalias_bits(buf + len, size - len,
1253 'e', id->evbit, 0, EV_MAX);
1254 len += input_print_modalias_bits(buf + len, size - len,
1255 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1256 len += input_print_modalias_bits(buf + len, size - len,
1257 'r', id->relbit, 0, REL_MAX);
1258 len += input_print_modalias_bits(buf + len, size - len,
1259 'a', id->absbit, 0, ABS_MAX);
1260 len += input_print_modalias_bits(buf + len, size - len,
1261 'm', id->mscbit, 0, MSC_MAX);
1262 len += input_print_modalias_bits(buf + len, size - len,
1263 'l', id->ledbit, 0, LED_MAX);
1264 len += input_print_modalias_bits(buf + len, size - len,
1265 's', id->sndbit, 0, SND_MAX);
1266 len += input_print_modalias_bits(buf + len, size - len,
1267 'f', id->ffbit, 0, FF_MAX);
1268 len += input_print_modalias_bits(buf + len, size - len,
1269 'w', id->swbit, 0, SW_MAX);
1272 len += snprintf(buf + len, max(size - len, 0), "\n");
1277 static ssize_t input_dev_show_modalias(struct device *dev,
1278 struct device_attribute *attr,
1281 struct input_dev *id = to_input_dev(dev);
1284 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1286 return min_t(int, len, PAGE_SIZE);
1288 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1290 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1291 int max, int add_cr);
1293 static ssize_t input_dev_show_properties(struct device *dev,
1294 struct device_attribute *attr,
1297 struct input_dev *input_dev = to_input_dev(dev);
1298 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1299 INPUT_PROP_MAX, true);
1300 return min_t(int, len, PAGE_SIZE);
1302 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1304 static struct attribute *input_dev_attrs[] = {
1305 &dev_attr_name.attr,
1306 &dev_attr_phys.attr,
1307 &dev_attr_uniq.attr,
1308 &dev_attr_modalias.attr,
1309 &dev_attr_properties.attr,
1313 static struct attribute_group input_dev_attr_group = {
1314 .attrs = input_dev_attrs,
1317 #define INPUT_DEV_ID_ATTR(name) \
1318 static ssize_t input_dev_show_id_##name(struct device *dev, \
1319 struct device_attribute *attr, \
1322 struct input_dev *input_dev = to_input_dev(dev); \
1323 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1325 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1327 INPUT_DEV_ID_ATTR(bustype);
1328 INPUT_DEV_ID_ATTR(vendor);
1329 INPUT_DEV_ID_ATTR(product);
1330 INPUT_DEV_ID_ATTR(version);
1332 static struct attribute *input_dev_id_attrs[] = {
1333 &dev_attr_bustype.attr,
1334 &dev_attr_vendor.attr,
1335 &dev_attr_product.attr,
1336 &dev_attr_version.attr,
1340 static struct attribute_group input_dev_id_attr_group = {
1342 .attrs = input_dev_id_attrs,
1345 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1346 int max, int add_cr)
1350 bool skip_empty = true;
1352 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1353 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1354 bitmap[i], skip_empty);
1358 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1363 * If no output was produced print a single 0.
1366 len = snprintf(buf, buf_size, "%d", 0);
1369 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1374 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1375 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1376 struct device_attribute *attr, \
1379 struct input_dev *input_dev = to_input_dev(dev); \
1380 int len = input_print_bitmap(buf, PAGE_SIZE, \
1381 input_dev->bm##bit, ev##_MAX, \
1383 return min_t(int, len, PAGE_SIZE); \
1385 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1387 INPUT_DEV_CAP_ATTR(EV, ev);
1388 INPUT_DEV_CAP_ATTR(KEY, key);
1389 INPUT_DEV_CAP_ATTR(REL, rel);
1390 INPUT_DEV_CAP_ATTR(ABS, abs);
1391 INPUT_DEV_CAP_ATTR(MSC, msc);
1392 INPUT_DEV_CAP_ATTR(LED, led);
1393 INPUT_DEV_CAP_ATTR(SND, snd);
1394 INPUT_DEV_CAP_ATTR(FF, ff);
1395 INPUT_DEV_CAP_ATTR(SW, sw);
1397 static struct attribute *input_dev_caps_attrs[] = {
1410 static struct attribute_group input_dev_caps_attr_group = {
1411 .name = "capabilities",
1412 .attrs = input_dev_caps_attrs,
1415 static const struct attribute_group *input_dev_attr_groups[] = {
1416 &input_dev_attr_group,
1417 &input_dev_id_attr_group,
1418 &input_dev_caps_attr_group,
1422 static void input_dev_release(struct device *device)
1424 struct input_dev *dev = to_input_dev(device);
1426 input_ff_destroy(dev);
1427 input_mt_destroy_slots(dev);
1428 kfree(dev->absinfo);
1431 module_put(THIS_MODULE);
1435 * Input uevent interface - loading event handlers based on
1438 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1439 const char *name, unsigned long *bitmap, int max)
1443 if (add_uevent_var(env, "%s", name))
1446 len = input_print_bitmap(&env->buf[env->buflen - 1],
1447 sizeof(env->buf) - env->buflen,
1448 bitmap, max, false);
1449 if (len >= (sizeof(env->buf) - env->buflen))
1456 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1457 struct input_dev *dev)
1461 if (add_uevent_var(env, "MODALIAS="))
1464 len = input_print_modalias(&env->buf[env->buflen - 1],
1465 sizeof(env->buf) - env->buflen,
1467 if (len >= (sizeof(env->buf) - env->buflen))
1474 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1476 int err = add_uevent_var(env, fmt, val); \
1481 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1483 int err = input_add_uevent_bm_var(env, name, bm, max); \
1488 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1490 int err = input_add_uevent_modalias_var(env, dev); \
1495 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1497 struct input_dev *dev = to_input_dev(device);
1499 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1500 dev->id.bustype, dev->id.vendor,
1501 dev->id.product, dev->id.version);
1503 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1505 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1507 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1509 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1511 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1512 if (test_bit(EV_KEY, dev->evbit))
1513 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1514 if (test_bit(EV_REL, dev->evbit))
1515 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1516 if (test_bit(EV_ABS, dev->evbit))
1517 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1518 if (test_bit(EV_MSC, dev->evbit))
1519 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1520 if (test_bit(EV_LED, dev->evbit))
1521 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1522 if (test_bit(EV_SND, dev->evbit))
1523 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1524 if (test_bit(EV_FF, dev->evbit))
1525 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1526 if (test_bit(EV_SW, dev->evbit))
1527 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1529 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1534 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1539 if (!test_bit(EV_##type, dev->evbit)) \
1542 for (i = 0; i < type##_MAX; i++) { \
1543 if (!test_bit(i, dev->bits##bit)) \
1546 active = test_bit(i, dev->bits); \
1547 if (!active && !on) \
1550 dev->event(dev, EV_##type, i, on ? active : 0); \
1554 static void input_dev_toggle(struct input_dev *dev, bool activate)
1559 INPUT_DO_TOGGLE(dev, LED, led, activate);
1560 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1562 if (activate && test_bit(EV_REP, dev->evbit)) {
1563 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1564 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1569 * input_reset_device() - reset/restore the state of input device
1570 * @dev: input device whose state needs to be reset
1572 * This function tries to reset the state of an opened input device and
1573 * bring internal state and state if the hardware in sync with each other.
1574 * We mark all keys as released, restore LED state, repeat rate, etc.
1576 void input_reset_device(struct input_dev *dev)
1578 mutex_lock(&dev->mutex);
1581 input_dev_toggle(dev, true);
1584 * Keys that have been pressed at suspend time are unlikely
1585 * to be still pressed when we resume.
1587 spin_lock_irq(&dev->event_lock);
1588 input_dev_release_keys(dev);
1589 spin_unlock_irq(&dev->event_lock);
1592 mutex_unlock(&dev->mutex);
1594 EXPORT_SYMBOL(input_reset_device);
1597 static int input_dev_suspend(struct device *dev)
1599 struct input_dev *input_dev = to_input_dev(dev);
1601 mutex_lock(&input_dev->mutex);
1603 if (input_dev->users)
1604 input_dev_toggle(input_dev, false);
1606 mutex_unlock(&input_dev->mutex);
1611 static int input_dev_resume(struct device *dev)
1613 struct input_dev *input_dev = to_input_dev(dev);
1615 input_reset_device(input_dev);
1620 static const struct dev_pm_ops input_dev_pm_ops = {
1621 .suspend = input_dev_suspend,
1622 .resume = input_dev_resume,
1623 .poweroff = input_dev_suspend,
1624 .restore = input_dev_resume,
1626 #endif /* CONFIG_PM */
1628 static struct device_type input_dev_type = {
1629 .groups = input_dev_attr_groups,
1630 .release = input_dev_release,
1631 .uevent = input_dev_uevent,
1633 .pm = &input_dev_pm_ops,
1637 static char *input_devnode(struct device *dev, umode_t *mode)
1639 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1642 struct class input_class = {
1644 .devnode = input_devnode,
1646 EXPORT_SYMBOL_GPL(input_class);
1649 * input_allocate_device - allocate memory for new input device
1651 * Returns prepared struct input_dev or NULL.
1653 * NOTE: Use input_free_device() to free devices that have not been
1654 * registered; input_unregister_device() should be used for already
1655 * registered devices.
1657 struct input_dev *input_allocate_device(void)
1659 struct input_dev *dev;
1661 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1663 dev->dev.type = &input_dev_type;
1664 dev->dev.class = &input_class;
1665 device_initialize(&dev->dev);
1666 mutex_init(&dev->mutex);
1667 spin_lock_init(&dev->event_lock);
1668 INIT_LIST_HEAD(&dev->h_list);
1669 INIT_LIST_HEAD(&dev->node);
1671 __module_get(THIS_MODULE);
1676 EXPORT_SYMBOL(input_allocate_device);
1679 * input_free_device - free memory occupied by input_dev structure
1680 * @dev: input device to free
1682 * This function should only be used if input_register_device()
1683 * was not called yet or if it failed. Once device was registered
1684 * use input_unregister_device() and memory will be freed once last
1685 * reference to the device is dropped.
1687 * Device should be allocated by input_allocate_device().
1689 * NOTE: If there are references to the input device then memory
1690 * will not be freed until last reference is dropped.
1692 void input_free_device(struct input_dev *dev)
1695 input_put_device(dev);
1697 EXPORT_SYMBOL(input_free_device);
1700 * input_set_capability - mark device as capable of a certain event
1701 * @dev: device that is capable of emitting or accepting event
1702 * @type: type of the event (EV_KEY, EV_REL, etc...)
1705 * In addition to setting up corresponding bit in appropriate capability
1706 * bitmap the function also adjusts dev->evbit.
1708 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1712 __set_bit(code, dev->keybit);
1716 __set_bit(code, dev->relbit);
1720 __set_bit(code, dev->absbit);
1724 __set_bit(code, dev->mscbit);
1728 __set_bit(code, dev->swbit);
1732 __set_bit(code, dev->ledbit);
1736 __set_bit(code, dev->sndbit);
1740 __set_bit(code, dev->ffbit);
1748 pr_err("input_set_capability: unknown type %u (code %u)\n",
1754 __set_bit(type, dev->evbit);
1756 EXPORT_SYMBOL(input_set_capability);
1758 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1762 unsigned int events;
1765 mt_slots = dev->mt->num_slots;
1766 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1767 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1768 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1769 mt_slots = clamp(mt_slots, 2, 32);
1770 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1776 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1778 for (i = 0; i < ABS_CNT; i++) {
1779 if (test_bit(i, dev->absbit)) {
1780 if (input_is_mt_axis(i))
1787 for (i = 0; i < REL_CNT; i++)
1788 if (test_bit(i, dev->relbit))
1791 /* Make room for KEY and MSC events */
1797 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1799 if (!test_bit(EV_##type, dev->evbit)) \
1800 memset(dev->bits##bit, 0, \
1801 sizeof(dev->bits##bit)); \
1804 static void input_cleanse_bitmasks(struct input_dev *dev)
1806 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1807 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1808 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1809 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1810 INPUT_CLEANSE_BITMASK(dev, LED, led);
1811 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1812 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1813 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1817 * input_register_device - register device with input core
1818 * @dev: device to be registered
1820 * This function registers device with input core. The device must be
1821 * allocated with input_allocate_device() and all it's capabilities
1822 * set up before registering.
1823 * If function fails the device must be freed with input_free_device().
1824 * Once device has been successfully registered it can be unregistered
1825 * with input_unregister_device(); input_free_device() should not be
1826 * called in this case.
1828 int input_register_device(struct input_dev *dev)
1830 static atomic_t input_no = ATOMIC_INIT(0);
1831 struct input_handler *handler;
1832 unsigned int packet_size;
1836 /* Every input device generates EV_SYN/SYN_REPORT events. */
1837 __set_bit(EV_SYN, dev->evbit);
1839 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1840 __clear_bit(KEY_RESERVED, dev->keybit);
1842 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1843 input_cleanse_bitmasks(dev);
1845 packet_size = input_estimate_events_per_packet(dev);
1846 if (dev->hint_events_per_packet < packet_size)
1847 dev->hint_events_per_packet = packet_size;
1850 * If delay and period are pre-set by the driver, then autorepeating
1851 * is handled by the driver itself and we don't do it in input.c.
1853 init_timer(&dev->timer);
1854 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1855 dev->timer.data = (long) dev;
1856 dev->timer.function = input_repeat_key;
1857 dev->rep[REP_DELAY] = 250;
1858 dev->rep[REP_PERIOD] = 33;
1861 if (!dev->getkeycode)
1862 dev->getkeycode = input_default_getkeycode;
1864 if (!dev->setkeycode)
1865 dev->setkeycode = input_default_setkeycode;
1867 dev_set_name(&dev->dev, "input%ld",
1868 (unsigned long) atomic_inc_return(&input_no) - 1);
1870 error = device_add(&dev->dev);
1874 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1875 pr_info("%s as %s\n",
1876 dev->name ? dev->name : "Unspecified device",
1877 path ? path : "N/A");
1880 error = mutex_lock_interruptible(&input_mutex);
1882 device_del(&dev->dev);
1886 list_add_tail(&dev->node, &input_dev_list);
1888 list_for_each_entry(handler, &input_handler_list, node)
1889 input_attach_handler(dev, handler);
1891 input_wakeup_procfs_readers();
1893 mutex_unlock(&input_mutex);
1897 EXPORT_SYMBOL(input_register_device);
1900 * input_unregister_device - unregister previously registered device
1901 * @dev: device to be unregistered
1903 * This function unregisters an input device. Once device is unregistered
1904 * the caller should not try to access it as it may get freed at any moment.
1906 void input_unregister_device(struct input_dev *dev)
1908 struct input_handle *handle, *next;
1910 input_disconnect_device(dev);
1912 mutex_lock(&input_mutex);
1914 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1915 handle->handler->disconnect(handle);
1916 WARN_ON(!list_empty(&dev->h_list));
1918 del_timer_sync(&dev->timer);
1919 list_del_init(&dev->node);
1921 input_wakeup_procfs_readers();
1923 mutex_unlock(&input_mutex);
1925 device_unregister(&dev->dev);
1927 EXPORT_SYMBOL(input_unregister_device);
1930 * input_register_handler - register a new input handler
1931 * @handler: handler to be registered
1933 * This function registers a new input handler (interface) for input
1934 * devices in the system and attaches it to all input devices that
1935 * are compatible with the handler.
1937 int input_register_handler(struct input_handler *handler)
1939 struct input_dev *dev;
1942 retval = mutex_lock_interruptible(&input_mutex);
1946 INIT_LIST_HEAD(&handler->h_list);
1948 if (handler->fops != NULL) {
1949 if (input_table[handler->minor >> 5]) {
1953 input_table[handler->minor >> 5] = handler;
1956 list_add_tail(&handler->node, &input_handler_list);
1958 list_for_each_entry(dev, &input_dev_list, node)
1959 input_attach_handler(dev, handler);
1961 input_wakeup_procfs_readers();
1964 mutex_unlock(&input_mutex);
1967 EXPORT_SYMBOL(input_register_handler);
1970 * input_unregister_handler - unregisters an input handler
1971 * @handler: handler to be unregistered
1973 * This function disconnects a handler from its input devices and
1974 * removes it from lists of known handlers.
1976 void input_unregister_handler(struct input_handler *handler)
1978 struct input_handle *handle, *next;
1980 mutex_lock(&input_mutex);
1982 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1983 handler->disconnect(handle);
1984 WARN_ON(!list_empty(&handler->h_list));
1986 list_del_init(&handler->node);
1988 if (handler->fops != NULL)
1989 input_table[handler->minor >> 5] = NULL;
1991 input_wakeup_procfs_readers();
1993 mutex_unlock(&input_mutex);
1995 EXPORT_SYMBOL(input_unregister_handler);
1998 * input_handler_for_each_handle - handle iterator
1999 * @handler: input handler to iterate
2000 * @data: data for the callback
2001 * @fn: function to be called for each handle
2003 * Iterate over @bus's list of devices, and call @fn for each, passing
2004 * it @data and stop when @fn returns a non-zero value. The function is
2005 * using RCU to traverse the list and therefore may be usind in atonic
2006 * contexts. The @fn callback is invoked from RCU critical section and
2007 * thus must not sleep.
2009 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2010 int (*fn)(struct input_handle *, void *))
2012 struct input_handle *handle;
2017 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2018 retval = fn(handle, data);
2027 EXPORT_SYMBOL(input_handler_for_each_handle);
2030 * input_register_handle - register a new input handle
2031 * @handle: handle to register
2033 * This function puts a new input handle onto device's
2034 * and handler's lists so that events can flow through
2035 * it once it is opened using input_open_device().
2037 * This function is supposed to be called from handler's
2040 int input_register_handle(struct input_handle *handle)
2042 struct input_handler *handler = handle->handler;
2043 struct input_dev *dev = handle->dev;
2047 * We take dev->mutex here to prevent race with
2048 * input_release_device().
2050 error = mutex_lock_interruptible(&dev->mutex);
2055 * Filters go to the head of the list, normal handlers
2058 if (handler->filter)
2059 list_add_rcu(&handle->d_node, &dev->h_list);
2061 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2063 mutex_unlock(&dev->mutex);
2066 * Since we are supposed to be called from ->connect()
2067 * which is mutually exclusive with ->disconnect()
2068 * we can't be racing with input_unregister_handle()
2069 * and so separate lock is not needed here.
2071 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2074 handler->start(handle);
2078 EXPORT_SYMBOL(input_register_handle);
2081 * input_unregister_handle - unregister an input handle
2082 * @handle: handle to unregister
2084 * This function removes input handle from device's
2085 * and handler's lists.
2087 * This function is supposed to be called from handler's
2088 * disconnect() method.
2090 void input_unregister_handle(struct input_handle *handle)
2092 struct input_dev *dev = handle->dev;
2094 list_del_rcu(&handle->h_node);
2097 * Take dev->mutex to prevent race with input_release_device().
2099 mutex_lock(&dev->mutex);
2100 list_del_rcu(&handle->d_node);
2101 mutex_unlock(&dev->mutex);
2105 EXPORT_SYMBOL(input_unregister_handle);
2107 static int input_open_file(struct inode *inode, struct file *file)
2109 struct input_handler *handler;
2110 const struct file_operations *old_fops, *new_fops = NULL;
2113 err = mutex_lock_interruptible(&input_mutex);
2117 /* No load-on-demand here? */
2118 handler = input_table[iminor(inode) >> 5];
2120 new_fops = fops_get(handler->fops);
2122 mutex_unlock(&input_mutex);
2125 * That's _really_ odd. Usually NULL ->open means "nothing special",
2126 * not "no device". Oh, well...
2128 if (!new_fops || !new_fops->open) {
2134 old_fops = file->f_op;
2135 file->f_op = new_fops;
2137 err = new_fops->open(inode, file);
2139 fops_put(file->f_op);
2140 file->f_op = fops_get(old_fops);
2147 static const struct file_operations input_fops = {
2148 .owner = THIS_MODULE,
2149 .open = input_open_file,
2150 .llseek = noop_llseek,
2153 static int __init input_init(void)
2157 err = class_register(&input_class);
2159 pr_err("unable to register input_dev class\n");
2163 err = input_proc_init();
2167 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2169 pr_err("unable to register char major %d", INPUT_MAJOR);
2175 fail2: input_proc_exit();
2176 fail1: class_unregister(&input_class);
2180 static void __exit input_exit(void)
2183 unregister_chrdev(INPUT_MAJOR, "input");
2184 class_unregister(&input_class);
2187 subsys_initcall(input_init);
2188 module_exit(input_exit);