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;
73 * Pass event first through all filters and then, if event has not been
74 * filtered out, through all open handles. This function is called with
75 * dev->event_lock held and interrupts disabled.
77 static void input_pass_event(struct input_dev *dev,
78 struct input_handler *src_handler,
79 unsigned int type, unsigned int code, int value)
81 struct input_handler *handler;
82 struct input_handle *handle;
86 handle = rcu_dereference(dev->grab);
88 handle->handler->event(handle, type, code, value);
90 bool filtered = false;
92 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
96 handler = handle->handler;
99 * If this is the handler that injected this
100 * particular event we want to skip it to avoid
101 * filters firing again and again.
103 if (handler == src_handler)
106 if (!handler->filter) {
110 handler->event(handle, type, code, value);
112 } else if (handler->filter(handle, type, code, value))
121 * Generate software autorepeat event. Note that we take
122 * dev->event_lock here to avoid racing with input_event
123 * which may cause keys get "stuck".
125 static void input_repeat_key(unsigned long data)
127 struct input_dev *dev = (void *) data;
130 spin_lock_irqsave(&dev->event_lock, flags);
132 if (test_bit(dev->repeat_key, dev->key) &&
133 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
135 input_pass_event(dev, NULL, EV_KEY, dev->repeat_key, 2);
139 * Only send SYN_REPORT if we are not in a middle
140 * of driver parsing a new hardware packet.
141 * Otherwise assume that the driver will send
142 * SYN_REPORT once it's done.
144 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1);
147 if (dev->rep[REP_PERIOD])
148 mod_timer(&dev->timer, jiffies +
149 msecs_to_jiffies(dev->rep[REP_PERIOD]));
152 spin_unlock_irqrestore(&dev->event_lock, flags);
155 static void input_start_autorepeat(struct input_dev *dev, int code)
157 if (test_bit(EV_REP, dev->evbit) &&
158 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
160 dev->repeat_key = code;
161 mod_timer(&dev->timer,
162 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
166 static void input_stop_autorepeat(struct input_dev *dev)
168 del_timer(&dev->timer);
171 #define INPUT_IGNORE_EVENT 0
172 #define INPUT_PASS_TO_HANDLERS 1
173 #define INPUT_PASS_TO_DEVICE 2
174 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
176 static int input_handle_abs_event(struct input_dev *dev,
177 struct input_handler *src_handler,
178 unsigned int code, int *pval)
183 if (code == ABS_MT_SLOT) {
185 * "Stage" the event; we'll flush it later, when we
186 * get actual touch data.
188 if (*pval >= 0 && *pval < dev->mtsize)
191 return INPUT_IGNORE_EVENT;
194 is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST;
197 pold = &dev->absinfo[code].value;
198 } else if (dev->mt) {
199 struct input_mt_slot *mtslot = &dev->mt[dev->slot];
200 pold = &mtslot->abs[code - ABS_MT_FIRST];
203 * Bypass filtering for multi-touch events when
204 * not employing slots.
210 *pval = input_defuzz_abs_event(*pval, *pold,
211 dev->absinfo[code].fuzz);
213 return INPUT_IGNORE_EVENT;
218 /* Flush pending "slot" event */
219 if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
220 input_abs_set_val(dev, ABS_MT_SLOT, dev->slot);
221 input_pass_event(dev, src_handler,
222 EV_ABS, ABS_MT_SLOT, dev->slot);
225 return INPUT_PASS_TO_HANDLERS;
228 static void input_handle_event(struct input_dev *dev,
229 struct input_handler *src_handler,
230 unsigned int type, unsigned int code, int value)
232 int disposition = INPUT_IGNORE_EVENT;
239 disposition = INPUT_PASS_TO_ALL;
245 disposition = INPUT_PASS_TO_HANDLERS;
250 disposition = INPUT_PASS_TO_HANDLERS;
256 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
257 !!test_bit(code, dev->key) != value) {
260 __change_bit(code, dev->key);
262 input_start_autorepeat(dev, code);
264 input_stop_autorepeat(dev);
267 disposition = INPUT_PASS_TO_HANDLERS;
272 if (is_event_supported(code, dev->swbit, SW_MAX) &&
273 !!test_bit(code, dev->sw) != value) {
275 __change_bit(code, dev->sw);
276 disposition = INPUT_PASS_TO_HANDLERS;
281 if (is_event_supported(code, dev->absbit, ABS_MAX))
282 disposition = input_handle_abs_event(dev, src_handler,
288 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
289 disposition = INPUT_PASS_TO_HANDLERS;
294 if (is_event_supported(code, dev->mscbit, MSC_MAX))
295 disposition = INPUT_PASS_TO_ALL;
300 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
301 !!test_bit(code, dev->led) != value) {
303 __change_bit(code, dev->led);
304 disposition = INPUT_PASS_TO_ALL;
309 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
311 if (!!test_bit(code, dev->snd) != !!value)
312 __change_bit(code, dev->snd);
313 disposition = INPUT_PASS_TO_ALL;
318 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
319 dev->rep[code] = value;
320 disposition = INPUT_PASS_TO_ALL;
326 disposition = INPUT_PASS_TO_ALL;
330 disposition = INPUT_PASS_TO_ALL;
334 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
337 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
338 dev->event(dev, type, code, value);
340 if (disposition & INPUT_PASS_TO_HANDLERS)
341 input_pass_event(dev, src_handler, type, code, value);
345 * input_event() - report new input event
346 * @dev: device that generated the event
347 * @type: type of the event
349 * @value: value of the event
351 * This function should be used by drivers implementing various input
352 * devices to report input events. See also input_inject_event().
354 * NOTE: input_event() may be safely used right after input device was
355 * allocated with input_allocate_device(), even before it is registered
356 * with input_register_device(), but the event will not reach any of the
357 * input handlers. Such early invocation of input_event() may be used
358 * to 'seed' initial state of a switch or initial position of absolute
361 void input_event(struct input_dev *dev,
362 unsigned int type, unsigned int code, int value)
366 if (is_event_supported(type, dev->evbit, EV_MAX)) {
368 spin_lock_irqsave(&dev->event_lock, flags);
369 add_input_randomness(type, code, value);
370 input_handle_event(dev, NULL, type, code, value);
371 spin_unlock_irqrestore(&dev->event_lock, flags);
374 EXPORT_SYMBOL(input_event);
377 * input_inject_event() - send input event from input handler
378 * @handle: input handle to send event through
379 * @type: type of the event
381 * @value: value of the event
383 * Similar to input_event() but will ignore event if device is
384 * "grabbed" and handle injecting event is not the one that owns
387 void input_inject_event(struct input_handle *handle,
388 unsigned int type, unsigned int code, int value)
390 struct input_dev *dev = handle->dev;
391 struct input_handle *grab;
394 if (is_event_supported(type, dev->evbit, EV_MAX)) {
395 spin_lock_irqsave(&dev->event_lock, flags);
398 grab = rcu_dereference(dev->grab);
399 if (!grab || grab == handle)
400 input_handle_event(dev, handle->handler,
404 spin_unlock_irqrestore(&dev->event_lock, flags);
407 EXPORT_SYMBOL(input_inject_event);
410 * input_alloc_absinfo - allocates array of input_absinfo structs
411 * @dev: the input device emitting absolute events
413 * If the absinfo struct the caller asked for is already allocated, this
414 * functions will not do anything.
416 void input_alloc_absinfo(struct input_dev *dev)
419 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
422 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
424 EXPORT_SYMBOL(input_alloc_absinfo);
426 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
427 int min, int max, int fuzz, int flat)
429 struct input_absinfo *absinfo;
431 input_alloc_absinfo(dev);
435 absinfo = &dev->absinfo[axis];
436 absinfo->minimum = min;
437 absinfo->maximum = max;
438 absinfo->fuzz = fuzz;
439 absinfo->flat = flat;
441 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
443 EXPORT_SYMBOL(input_set_abs_params);
447 * input_grab_device - grabs device for exclusive use
448 * @handle: input handle that wants to own the device
450 * When a device is grabbed by an input handle all events generated by
451 * the device are delivered only to this handle. Also events injected
452 * by other input handles are ignored while device is grabbed.
454 int input_grab_device(struct input_handle *handle)
456 struct input_dev *dev = handle->dev;
459 retval = mutex_lock_interruptible(&dev->mutex);
468 rcu_assign_pointer(dev->grab, handle);
472 mutex_unlock(&dev->mutex);
475 EXPORT_SYMBOL(input_grab_device);
477 static void __input_release_device(struct input_handle *handle)
479 struct input_dev *dev = handle->dev;
481 if (dev->grab == handle) {
482 rcu_assign_pointer(dev->grab, NULL);
483 /* Make sure input_pass_event() notices that grab is gone */
486 list_for_each_entry(handle, &dev->h_list, d_node)
487 if (handle->open && handle->handler->start)
488 handle->handler->start(handle);
493 * input_release_device - release previously grabbed device
494 * @handle: input handle that owns the device
496 * Releases previously grabbed device so that other input handles can
497 * start receiving input events. Upon release all handlers attached
498 * to the device have their start() method called so they have a change
499 * to synchronize device state with the rest of the system.
501 void input_release_device(struct input_handle *handle)
503 struct input_dev *dev = handle->dev;
505 mutex_lock(&dev->mutex);
506 __input_release_device(handle);
507 mutex_unlock(&dev->mutex);
509 EXPORT_SYMBOL(input_release_device);
512 * input_open_device - open input device
513 * @handle: handle through which device is being accessed
515 * This function should be called by input handlers when they
516 * want to start receive events from given input device.
518 int input_open_device(struct input_handle *handle)
520 struct input_dev *dev = handle->dev;
523 retval = mutex_lock_interruptible(&dev->mutex);
527 if (dev->going_away) {
534 if (!dev->users++ && dev->open)
535 retval = dev->open(dev);
539 if (!--handle->open) {
541 * Make sure we are not delivering any more events
542 * through this handle
549 mutex_unlock(&dev->mutex);
552 EXPORT_SYMBOL(input_open_device);
554 int input_flush_device(struct input_handle *handle, struct file *file)
556 struct input_dev *dev = handle->dev;
559 retval = mutex_lock_interruptible(&dev->mutex);
564 retval = dev->flush(dev, file);
566 mutex_unlock(&dev->mutex);
569 EXPORT_SYMBOL(input_flush_device);
572 * input_close_device - close input device
573 * @handle: handle through which device is being accessed
575 * This function should be called by input handlers when they
576 * want to stop receive events from given input device.
578 void input_close_device(struct input_handle *handle)
580 struct input_dev *dev = handle->dev;
582 mutex_lock(&dev->mutex);
584 __input_release_device(handle);
586 if (!--dev->users && dev->close)
589 if (!--handle->open) {
591 * synchronize_rcu() makes sure that input_pass_event()
592 * completed and that no more input events are delivered
593 * through this handle
598 mutex_unlock(&dev->mutex);
600 EXPORT_SYMBOL(input_close_device);
603 * Simulate keyup events for all keys that are marked as pressed.
604 * The function must be called with dev->event_lock held.
606 static void input_dev_release_keys(struct input_dev *dev)
610 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
611 for (code = 0; code <= KEY_MAX; code++) {
612 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
613 __test_and_clear_bit(code, dev->key)) {
614 input_pass_event(dev, NULL, EV_KEY, code, 0);
617 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1);
622 * Prepare device for unregistering
624 static void input_disconnect_device(struct input_dev *dev)
626 struct input_handle *handle;
629 * Mark device as going away. Note that we take dev->mutex here
630 * not to protect access to dev->going_away but rather to ensure
631 * that there are no threads in the middle of input_open_device()
633 mutex_lock(&dev->mutex);
634 dev->going_away = true;
635 mutex_unlock(&dev->mutex);
637 spin_lock_irq(&dev->event_lock);
640 * Simulate keyup events for all pressed keys so that handlers
641 * are not left with "stuck" keys. The driver may continue
642 * generate events even after we done here but they will not
643 * reach any handlers.
645 input_dev_release_keys(dev);
647 list_for_each_entry(handle, &dev->h_list, d_node)
650 spin_unlock_irq(&dev->event_lock);
654 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
655 * @ke: keymap entry containing scancode to be converted.
656 * @scancode: pointer to the location where converted scancode should
659 * This function is used to convert scancode stored in &struct keymap_entry
660 * into scalar form understood by legacy keymap handling methods. These
661 * methods expect scancodes to be represented as 'unsigned int'.
663 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
664 unsigned int *scancode)
668 *scancode = *((u8 *)ke->scancode);
672 *scancode = *((u16 *)ke->scancode);
676 *scancode = *((u32 *)ke->scancode);
685 EXPORT_SYMBOL(input_scancode_to_scalar);
688 * Those routines handle the default case where no [gs]etkeycode() is
689 * defined. In this case, an array indexed by the scancode is used.
692 static unsigned int input_fetch_keycode(struct input_dev *dev,
695 switch (dev->keycodesize) {
697 return ((u8 *)dev->keycode)[index];
700 return ((u16 *)dev->keycode)[index];
703 return ((u32 *)dev->keycode)[index];
707 static int input_default_getkeycode(struct input_dev *dev,
708 struct input_keymap_entry *ke)
713 if (!dev->keycodesize)
716 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
719 error = input_scancode_to_scalar(ke, &index);
724 if (index >= dev->keycodemax)
727 ke->keycode = input_fetch_keycode(dev, index);
729 ke->len = sizeof(index);
730 memcpy(ke->scancode, &index, sizeof(index));
735 static int input_default_setkeycode(struct input_dev *dev,
736 const struct input_keymap_entry *ke,
737 unsigned int *old_keycode)
743 if (!dev->keycodesize)
746 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
749 error = input_scancode_to_scalar(ke, &index);
754 if (index >= dev->keycodemax)
757 if (dev->keycodesize < sizeof(ke->keycode) &&
758 (ke->keycode >> (dev->keycodesize * 8)))
761 switch (dev->keycodesize) {
763 u8 *k = (u8 *)dev->keycode;
764 *old_keycode = k[index];
765 k[index] = ke->keycode;
769 u16 *k = (u16 *)dev->keycode;
770 *old_keycode = k[index];
771 k[index] = ke->keycode;
775 u32 *k = (u32 *)dev->keycode;
776 *old_keycode = k[index];
777 k[index] = ke->keycode;
782 __clear_bit(*old_keycode, dev->keybit);
783 __set_bit(ke->keycode, dev->keybit);
785 for (i = 0; i < dev->keycodemax; i++) {
786 if (input_fetch_keycode(dev, i) == *old_keycode) {
787 __set_bit(*old_keycode, dev->keybit);
788 break; /* Setting the bit twice is useless, so break */
796 * input_get_keycode - retrieve keycode currently mapped to a given scancode
797 * @dev: input device which keymap is being queried
800 * This function should be called by anyone interested in retrieving current
801 * keymap. Presently evdev handlers use it.
803 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
808 spin_lock_irqsave(&dev->event_lock, flags);
809 retval = dev->getkeycode(dev, ke);
810 spin_unlock_irqrestore(&dev->event_lock, flags);
814 EXPORT_SYMBOL(input_get_keycode);
817 * input_set_keycode - attribute a keycode to a given scancode
818 * @dev: input device which keymap is being updated
819 * @ke: new keymap entry
821 * This function should be called by anyone needing to update current
822 * keymap. Presently keyboard and evdev handlers use it.
824 int input_set_keycode(struct input_dev *dev,
825 const struct input_keymap_entry *ke)
828 unsigned int old_keycode;
831 if (ke->keycode > KEY_MAX)
834 spin_lock_irqsave(&dev->event_lock, flags);
836 retval = dev->setkeycode(dev, ke, &old_keycode);
840 /* Make sure KEY_RESERVED did not get enabled. */
841 __clear_bit(KEY_RESERVED, dev->keybit);
844 * Simulate keyup event if keycode is not present
845 * in the keymap anymore
847 if (test_bit(EV_KEY, dev->evbit) &&
848 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
849 __test_and_clear_bit(old_keycode, dev->key)) {
851 input_pass_event(dev, NULL, EV_KEY, old_keycode, 0);
853 input_pass_event(dev, NULL, EV_SYN, SYN_REPORT, 1);
857 spin_unlock_irqrestore(&dev->event_lock, flags);
861 EXPORT_SYMBOL(input_set_keycode);
863 #define MATCH_BIT(bit, max) \
864 for (i = 0; i < BITS_TO_LONGS(max); i++) \
865 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
867 if (i != BITS_TO_LONGS(max)) \
870 static const struct input_device_id *input_match_device(struct input_handler *handler,
871 struct input_dev *dev)
873 const struct input_device_id *id;
876 for (id = handler->id_table; id->flags || id->driver_info; id++) {
878 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
879 if (id->bustype != dev->id.bustype)
882 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
883 if (id->vendor != dev->id.vendor)
886 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
887 if (id->product != dev->id.product)
890 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
891 if (id->version != dev->id.version)
894 MATCH_BIT(evbit, EV_MAX);
895 MATCH_BIT(keybit, KEY_MAX);
896 MATCH_BIT(relbit, REL_MAX);
897 MATCH_BIT(absbit, ABS_MAX);
898 MATCH_BIT(mscbit, MSC_MAX);
899 MATCH_BIT(ledbit, LED_MAX);
900 MATCH_BIT(sndbit, SND_MAX);
901 MATCH_BIT(ffbit, FF_MAX);
902 MATCH_BIT(swbit, SW_MAX);
904 if (!handler->match || handler->match(handler, dev))
911 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
913 const struct input_device_id *id;
916 id = input_match_device(handler, dev);
920 error = handler->connect(handler, dev, id);
921 if (error && error != -ENODEV)
922 pr_err("failed to attach handler %s to device %s, error: %d\n",
923 handler->name, kobject_name(&dev->dev.kobj), error);
930 static int input_bits_to_string(char *buf, int buf_size,
931 unsigned long bits, bool skip_empty)
935 if (INPUT_COMPAT_TEST) {
936 u32 dword = bits >> 32;
937 if (dword || !skip_empty)
938 len += snprintf(buf, buf_size, "%x ", dword);
940 dword = bits & 0xffffffffUL;
941 if (dword || !skip_empty || len)
942 len += snprintf(buf + len, max(buf_size - len, 0),
945 if (bits || !skip_empty)
946 len += snprintf(buf, buf_size, "%lx", bits);
952 #else /* !CONFIG_COMPAT */
954 static int input_bits_to_string(char *buf, int buf_size,
955 unsigned long bits, bool skip_empty)
957 return bits || !skip_empty ?
958 snprintf(buf, buf_size, "%lx", bits) : 0;
963 #ifdef CONFIG_PROC_FS
965 static struct proc_dir_entry *proc_bus_input_dir;
966 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
967 static int input_devices_state;
969 static inline void input_wakeup_procfs_readers(void)
971 input_devices_state++;
972 wake_up(&input_devices_poll_wait);
975 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
977 poll_wait(file, &input_devices_poll_wait, wait);
978 if (file->f_version != input_devices_state) {
979 file->f_version = input_devices_state;
980 return POLLIN | POLLRDNORM;
986 union input_seq_state {
994 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
996 union input_seq_state *state = (union input_seq_state *)&seq->private;
999 /* We need to fit into seq->private pointer */
1000 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1002 error = mutex_lock_interruptible(&input_mutex);
1004 state->mutex_acquired = false;
1005 return ERR_PTR(error);
1008 state->mutex_acquired = true;
1010 return seq_list_start(&input_dev_list, *pos);
1013 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1015 return seq_list_next(v, &input_dev_list, pos);
1018 static void input_seq_stop(struct seq_file *seq, void *v)
1020 union input_seq_state *state = (union input_seq_state *)&seq->private;
1022 if (state->mutex_acquired)
1023 mutex_unlock(&input_mutex);
1026 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1027 unsigned long *bitmap, int max)
1030 bool skip_empty = true;
1033 seq_printf(seq, "B: %s=", name);
1035 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1036 if (input_bits_to_string(buf, sizeof(buf),
1037 bitmap[i], skip_empty)) {
1039 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1044 * If no output was produced print a single 0.
1049 seq_putc(seq, '\n');
1052 static int input_devices_seq_show(struct seq_file *seq, void *v)
1054 struct input_dev *dev = container_of(v, struct input_dev, node);
1055 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1056 struct input_handle *handle;
1058 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1059 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1061 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1062 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1063 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1064 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1065 seq_printf(seq, "H: Handlers=");
1067 list_for_each_entry(handle, &dev->h_list, d_node)
1068 seq_printf(seq, "%s ", handle->name);
1069 seq_putc(seq, '\n');
1071 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1073 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1074 if (test_bit(EV_KEY, dev->evbit))
1075 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1076 if (test_bit(EV_REL, dev->evbit))
1077 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1078 if (test_bit(EV_ABS, dev->evbit))
1079 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1080 if (test_bit(EV_MSC, dev->evbit))
1081 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1082 if (test_bit(EV_LED, dev->evbit))
1083 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1084 if (test_bit(EV_SND, dev->evbit))
1085 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1086 if (test_bit(EV_FF, dev->evbit))
1087 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1088 if (test_bit(EV_SW, dev->evbit))
1089 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1091 seq_putc(seq, '\n');
1097 static const struct seq_operations input_devices_seq_ops = {
1098 .start = input_devices_seq_start,
1099 .next = input_devices_seq_next,
1100 .stop = input_seq_stop,
1101 .show = input_devices_seq_show,
1104 static int input_proc_devices_open(struct inode *inode, struct file *file)
1106 return seq_open(file, &input_devices_seq_ops);
1109 static const struct file_operations input_devices_fileops = {
1110 .owner = THIS_MODULE,
1111 .open = input_proc_devices_open,
1112 .poll = input_proc_devices_poll,
1114 .llseek = seq_lseek,
1115 .release = seq_release,
1118 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1120 union input_seq_state *state = (union input_seq_state *)&seq->private;
1123 /* We need to fit into seq->private pointer */
1124 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1126 error = mutex_lock_interruptible(&input_mutex);
1128 state->mutex_acquired = false;
1129 return ERR_PTR(error);
1132 state->mutex_acquired = true;
1135 return seq_list_start(&input_handler_list, *pos);
1138 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1140 union input_seq_state *state = (union input_seq_state *)&seq->private;
1142 state->pos = *pos + 1;
1143 return seq_list_next(v, &input_handler_list, pos);
1146 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1148 struct input_handler *handler = container_of(v, struct input_handler, node);
1149 union input_seq_state *state = (union input_seq_state *)&seq->private;
1151 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1152 if (handler->filter)
1153 seq_puts(seq, " (filter)");
1155 seq_printf(seq, " Minor=%d", handler->minor);
1156 seq_putc(seq, '\n');
1161 static const struct seq_operations input_handlers_seq_ops = {
1162 .start = input_handlers_seq_start,
1163 .next = input_handlers_seq_next,
1164 .stop = input_seq_stop,
1165 .show = input_handlers_seq_show,
1168 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1170 return seq_open(file, &input_handlers_seq_ops);
1173 static const struct file_operations input_handlers_fileops = {
1174 .owner = THIS_MODULE,
1175 .open = input_proc_handlers_open,
1177 .llseek = seq_lseek,
1178 .release = seq_release,
1181 static int __init input_proc_init(void)
1183 struct proc_dir_entry *entry;
1185 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1186 if (!proc_bus_input_dir)
1189 entry = proc_create("devices", 0, proc_bus_input_dir,
1190 &input_devices_fileops);
1194 entry = proc_create("handlers", 0, proc_bus_input_dir,
1195 &input_handlers_fileops);
1201 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1202 fail1: remove_proc_entry("bus/input", NULL);
1206 static void input_proc_exit(void)
1208 remove_proc_entry("devices", proc_bus_input_dir);
1209 remove_proc_entry("handlers", proc_bus_input_dir);
1210 remove_proc_entry("bus/input", NULL);
1213 #else /* !CONFIG_PROC_FS */
1214 static inline void input_wakeup_procfs_readers(void) { }
1215 static inline int input_proc_init(void) { return 0; }
1216 static inline void input_proc_exit(void) { }
1219 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1220 static ssize_t input_dev_show_##name(struct device *dev, \
1221 struct device_attribute *attr, \
1224 struct input_dev *input_dev = to_input_dev(dev); \
1226 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1227 input_dev->name ? input_dev->name : ""); \
1229 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1231 INPUT_DEV_STRING_ATTR_SHOW(name);
1232 INPUT_DEV_STRING_ATTR_SHOW(phys);
1233 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1235 static int input_print_modalias_bits(char *buf, int size,
1236 char name, unsigned long *bm,
1237 unsigned int min_bit, unsigned int max_bit)
1241 len += snprintf(buf, max(size, 0), "%c", name);
1242 for (i = min_bit; i < max_bit; i++)
1243 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1244 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1248 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1253 len = snprintf(buf, max(size, 0),
1254 "input:b%04Xv%04Xp%04Xe%04X-",
1255 id->id.bustype, id->id.vendor,
1256 id->id.product, id->id.version);
1258 len += input_print_modalias_bits(buf + len, size - len,
1259 'e', id->evbit, 0, EV_MAX);
1260 len += input_print_modalias_bits(buf + len, size - len,
1261 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1262 len += input_print_modalias_bits(buf + len, size - len,
1263 'r', id->relbit, 0, REL_MAX);
1264 len += input_print_modalias_bits(buf + len, size - len,
1265 'a', id->absbit, 0, ABS_MAX);
1266 len += input_print_modalias_bits(buf + len, size - len,
1267 'm', id->mscbit, 0, MSC_MAX);
1268 len += input_print_modalias_bits(buf + len, size - len,
1269 'l', id->ledbit, 0, LED_MAX);
1270 len += input_print_modalias_bits(buf + len, size - len,
1271 's', id->sndbit, 0, SND_MAX);
1272 len += input_print_modalias_bits(buf + len, size - len,
1273 'f', id->ffbit, 0, FF_MAX);
1274 len += input_print_modalias_bits(buf + len, size - len,
1275 'w', id->swbit, 0, SW_MAX);
1278 len += snprintf(buf + len, max(size - len, 0), "\n");
1283 static ssize_t input_dev_show_modalias(struct device *dev,
1284 struct device_attribute *attr,
1287 struct input_dev *id = to_input_dev(dev);
1290 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1292 return min_t(int, len, PAGE_SIZE);
1294 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1296 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1297 int max, int add_cr);
1299 static ssize_t input_dev_show_properties(struct device *dev,
1300 struct device_attribute *attr,
1303 struct input_dev *input_dev = to_input_dev(dev);
1304 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1305 INPUT_PROP_MAX, true);
1306 return min_t(int, len, PAGE_SIZE);
1308 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1310 static struct attribute *input_dev_attrs[] = {
1311 &dev_attr_name.attr,
1312 &dev_attr_phys.attr,
1313 &dev_attr_uniq.attr,
1314 &dev_attr_modalias.attr,
1315 &dev_attr_properties.attr,
1319 static struct attribute_group input_dev_attr_group = {
1320 .attrs = input_dev_attrs,
1323 #define INPUT_DEV_ID_ATTR(name) \
1324 static ssize_t input_dev_show_id_##name(struct device *dev, \
1325 struct device_attribute *attr, \
1328 struct input_dev *input_dev = to_input_dev(dev); \
1329 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1331 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1333 INPUT_DEV_ID_ATTR(bustype);
1334 INPUT_DEV_ID_ATTR(vendor);
1335 INPUT_DEV_ID_ATTR(product);
1336 INPUT_DEV_ID_ATTR(version);
1338 static struct attribute *input_dev_id_attrs[] = {
1339 &dev_attr_bustype.attr,
1340 &dev_attr_vendor.attr,
1341 &dev_attr_product.attr,
1342 &dev_attr_version.attr,
1346 static struct attribute_group input_dev_id_attr_group = {
1348 .attrs = input_dev_id_attrs,
1351 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1352 int max, int add_cr)
1356 bool skip_empty = true;
1358 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1359 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1360 bitmap[i], skip_empty);
1364 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1369 * If no output was produced print a single 0.
1372 len = snprintf(buf, buf_size, "%d", 0);
1375 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1380 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1381 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1382 struct device_attribute *attr, \
1385 struct input_dev *input_dev = to_input_dev(dev); \
1386 int len = input_print_bitmap(buf, PAGE_SIZE, \
1387 input_dev->bm##bit, ev##_MAX, \
1389 return min_t(int, len, PAGE_SIZE); \
1391 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1393 INPUT_DEV_CAP_ATTR(EV, ev);
1394 INPUT_DEV_CAP_ATTR(KEY, key);
1395 INPUT_DEV_CAP_ATTR(REL, rel);
1396 INPUT_DEV_CAP_ATTR(ABS, abs);
1397 INPUT_DEV_CAP_ATTR(MSC, msc);
1398 INPUT_DEV_CAP_ATTR(LED, led);
1399 INPUT_DEV_CAP_ATTR(SND, snd);
1400 INPUT_DEV_CAP_ATTR(FF, ff);
1401 INPUT_DEV_CAP_ATTR(SW, sw);
1403 static struct attribute *input_dev_caps_attrs[] = {
1416 static struct attribute_group input_dev_caps_attr_group = {
1417 .name = "capabilities",
1418 .attrs = input_dev_caps_attrs,
1421 static const struct attribute_group *input_dev_attr_groups[] = {
1422 &input_dev_attr_group,
1423 &input_dev_id_attr_group,
1424 &input_dev_caps_attr_group,
1428 static void input_dev_release(struct device *device)
1430 struct input_dev *dev = to_input_dev(device);
1432 input_ff_destroy(dev);
1433 input_mt_destroy_slots(dev);
1434 kfree(dev->absinfo);
1437 module_put(THIS_MODULE);
1441 * Input uevent interface - loading event handlers based on
1444 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1445 const char *name, unsigned long *bitmap, int max)
1449 if (add_uevent_var(env, "%s", name))
1452 len = input_print_bitmap(&env->buf[env->buflen - 1],
1453 sizeof(env->buf) - env->buflen,
1454 bitmap, max, false);
1455 if (len >= (sizeof(env->buf) - env->buflen))
1462 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1463 struct input_dev *dev)
1467 if (add_uevent_var(env, "MODALIAS="))
1470 len = input_print_modalias(&env->buf[env->buflen - 1],
1471 sizeof(env->buf) - env->buflen,
1473 if (len >= (sizeof(env->buf) - env->buflen))
1480 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1482 int err = add_uevent_var(env, fmt, val); \
1487 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1489 int err = input_add_uevent_bm_var(env, name, bm, max); \
1494 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1496 int err = input_add_uevent_modalias_var(env, dev); \
1501 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1503 struct input_dev *dev = to_input_dev(device);
1505 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1506 dev->id.bustype, dev->id.vendor,
1507 dev->id.product, dev->id.version);
1509 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1511 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1513 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1515 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1517 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1518 if (test_bit(EV_KEY, dev->evbit))
1519 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1520 if (test_bit(EV_REL, dev->evbit))
1521 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1522 if (test_bit(EV_ABS, dev->evbit))
1523 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1524 if (test_bit(EV_MSC, dev->evbit))
1525 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1526 if (test_bit(EV_LED, dev->evbit))
1527 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1528 if (test_bit(EV_SND, dev->evbit))
1529 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1530 if (test_bit(EV_FF, dev->evbit))
1531 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1532 if (test_bit(EV_SW, dev->evbit))
1533 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1535 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1540 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1545 if (!test_bit(EV_##type, dev->evbit)) \
1548 for (i = 0; i < type##_MAX; i++) { \
1549 if (!test_bit(i, dev->bits##bit)) \
1552 active = test_bit(i, dev->bits); \
1553 if (!active && !on) \
1556 dev->event(dev, EV_##type, i, on ? active : 0); \
1560 static void input_dev_toggle(struct input_dev *dev, bool activate)
1565 INPUT_DO_TOGGLE(dev, LED, led, activate);
1566 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1568 if (activate && test_bit(EV_REP, dev->evbit)) {
1569 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1570 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1575 * input_reset_device() - reset/restore the state of input device
1576 * @dev: input device whose state needs to be reset
1578 * This function tries to reset the state of an opened input device and
1579 * bring internal state and state if the hardware in sync with each other.
1580 * We mark all keys as released, restore LED state, repeat rate, etc.
1582 void input_reset_device(struct input_dev *dev)
1584 mutex_lock(&dev->mutex);
1587 input_dev_toggle(dev, true);
1590 * Keys that have been pressed at suspend time are unlikely
1591 * to be still pressed when we resume.
1593 spin_lock_irq(&dev->event_lock);
1594 input_dev_release_keys(dev);
1595 spin_unlock_irq(&dev->event_lock);
1598 mutex_unlock(&dev->mutex);
1600 EXPORT_SYMBOL(input_reset_device);
1603 static int input_dev_suspend(struct device *dev)
1605 struct input_dev *input_dev = to_input_dev(dev);
1607 mutex_lock(&input_dev->mutex);
1609 if (input_dev->users)
1610 input_dev_toggle(input_dev, false);
1612 mutex_unlock(&input_dev->mutex);
1617 static int input_dev_resume(struct device *dev)
1619 struct input_dev *input_dev = to_input_dev(dev);
1621 input_reset_device(input_dev);
1626 static const struct dev_pm_ops input_dev_pm_ops = {
1627 .suspend = input_dev_suspend,
1628 .resume = input_dev_resume,
1629 .poweroff = input_dev_suspend,
1630 .restore = input_dev_resume,
1632 #endif /* CONFIG_PM */
1634 static struct device_type input_dev_type = {
1635 .groups = input_dev_attr_groups,
1636 .release = input_dev_release,
1637 .uevent = input_dev_uevent,
1639 .pm = &input_dev_pm_ops,
1643 static char *input_devnode(struct device *dev, mode_t *mode)
1645 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1648 struct class input_class = {
1650 .devnode = input_devnode,
1652 EXPORT_SYMBOL_GPL(input_class);
1655 * input_allocate_device - allocate memory for new input device
1657 * Returns prepared struct input_dev or NULL.
1659 * NOTE: Use input_free_device() to free devices that have not been
1660 * registered; input_unregister_device() should be used for already
1661 * registered devices.
1663 struct input_dev *input_allocate_device(void)
1665 struct input_dev *dev;
1667 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1669 dev->dev.type = &input_dev_type;
1670 dev->dev.class = &input_class;
1671 device_initialize(&dev->dev);
1672 mutex_init(&dev->mutex);
1673 spin_lock_init(&dev->event_lock);
1674 INIT_LIST_HEAD(&dev->h_list);
1675 INIT_LIST_HEAD(&dev->node);
1677 __module_get(THIS_MODULE);
1682 EXPORT_SYMBOL(input_allocate_device);
1685 * input_free_device - free memory occupied by input_dev structure
1686 * @dev: input device to free
1688 * This function should only be used if input_register_device()
1689 * was not called yet or if it failed. Once device was registered
1690 * use input_unregister_device() and memory will be freed once last
1691 * reference to the device is dropped.
1693 * Device should be allocated by input_allocate_device().
1695 * NOTE: If there are references to the input device then memory
1696 * will not be freed until last reference is dropped.
1698 void input_free_device(struct input_dev *dev)
1701 input_put_device(dev);
1703 EXPORT_SYMBOL(input_free_device);
1706 * input_set_capability - mark device as capable of a certain event
1707 * @dev: device that is capable of emitting or accepting event
1708 * @type: type of the event (EV_KEY, EV_REL, etc...)
1711 * In addition to setting up corresponding bit in appropriate capability
1712 * bitmap the function also adjusts dev->evbit.
1714 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1718 __set_bit(code, dev->keybit);
1722 __set_bit(code, dev->relbit);
1726 __set_bit(code, dev->absbit);
1730 __set_bit(code, dev->mscbit);
1734 __set_bit(code, dev->swbit);
1738 __set_bit(code, dev->ledbit);
1742 __set_bit(code, dev->sndbit);
1746 __set_bit(code, dev->ffbit);
1754 pr_err("input_set_capability: unknown type %u (code %u)\n",
1760 __set_bit(type, dev->evbit);
1762 EXPORT_SYMBOL(input_set_capability);
1764 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1766 if (!test_bit(EV_##type, dev->evbit)) \
1767 memset(dev->bits##bit, 0, \
1768 sizeof(dev->bits##bit)); \
1771 static void input_cleanse_bitmasks(struct input_dev *dev)
1773 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1774 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1775 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1776 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1777 INPUT_CLEANSE_BITMASK(dev, LED, led);
1778 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1779 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1780 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1784 * input_register_device - register device with input core
1785 * @dev: device to be registered
1787 * This function registers device with input core. The device must be
1788 * allocated with input_allocate_device() and all it's capabilities
1789 * set up before registering.
1790 * If function fails the device must be freed with input_free_device().
1791 * Once device has been successfully registered it can be unregistered
1792 * with input_unregister_device(); input_free_device() should not be
1793 * called in this case.
1795 int input_register_device(struct input_dev *dev)
1797 static atomic_t input_no = ATOMIC_INIT(0);
1798 struct input_handler *handler;
1802 /* Every input device generates EV_SYN/SYN_REPORT events. */
1803 __set_bit(EV_SYN, dev->evbit);
1805 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1806 __clear_bit(KEY_RESERVED, dev->keybit);
1808 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1809 input_cleanse_bitmasks(dev);
1812 * If delay and period are pre-set by the driver, then autorepeating
1813 * is handled by the driver itself and we don't do it in input.c.
1815 init_timer(&dev->timer);
1816 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1817 dev->timer.data = (long) dev;
1818 dev->timer.function = input_repeat_key;
1819 dev->rep[REP_DELAY] = 250;
1820 dev->rep[REP_PERIOD] = 33;
1823 if (!dev->getkeycode)
1824 dev->getkeycode = input_default_getkeycode;
1826 if (!dev->setkeycode)
1827 dev->setkeycode = input_default_setkeycode;
1829 dev_set_name(&dev->dev, "input%ld",
1830 (unsigned long) atomic_inc_return(&input_no) - 1);
1832 error = device_add(&dev->dev);
1836 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1837 pr_info("%s as %s\n",
1838 dev->name ? dev->name : "Unspecified device",
1839 path ? path : "N/A");
1842 error = mutex_lock_interruptible(&input_mutex);
1844 device_del(&dev->dev);
1848 list_add_tail(&dev->node, &input_dev_list);
1850 list_for_each_entry(handler, &input_handler_list, node)
1851 input_attach_handler(dev, handler);
1853 input_wakeup_procfs_readers();
1855 mutex_unlock(&input_mutex);
1859 EXPORT_SYMBOL(input_register_device);
1862 * input_unregister_device - unregister previously registered device
1863 * @dev: device to be unregistered
1865 * This function unregisters an input device. Once device is unregistered
1866 * the caller should not try to access it as it may get freed at any moment.
1868 void input_unregister_device(struct input_dev *dev)
1870 struct input_handle *handle, *next;
1872 input_disconnect_device(dev);
1874 mutex_lock(&input_mutex);
1876 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1877 handle->handler->disconnect(handle);
1878 WARN_ON(!list_empty(&dev->h_list));
1880 del_timer_sync(&dev->timer);
1881 list_del_init(&dev->node);
1883 input_wakeup_procfs_readers();
1885 mutex_unlock(&input_mutex);
1887 device_unregister(&dev->dev);
1889 EXPORT_SYMBOL(input_unregister_device);
1892 * input_register_handler - register a new input handler
1893 * @handler: handler to be registered
1895 * This function registers a new input handler (interface) for input
1896 * devices in the system and attaches it to all input devices that
1897 * are compatible with the handler.
1899 int input_register_handler(struct input_handler *handler)
1901 struct input_dev *dev;
1904 retval = mutex_lock_interruptible(&input_mutex);
1908 INIT_LIST_HEAD(&handler->h_list);
1910 if (handler->fops != NULL) {
1911 if (input_table[handler->minor >> 5]) {
1915 input_table[handler->minor >> 5] = handler;
1918 list_add_tail(&handler->node, &input_handler_list);
1920 list_for_each_entry(dev, &input_dev_list, node)
1921 input_attach_handler(dev, handler);
1923 input_wakeup_procfs_readers();
1926 mutex_unlock(&input_mutex);
1929 EXPORT_SYMBOL(input_register_handler);
1932 * input_unregister_handler - unregisters an input handler
1933 * @handler: handler to be unregistered
1935 * This function disconnects a handler from its input devices and
1936 * removes it from lists of known handlers.
1938 void input_unregister_handler(struct input_handler *handler)
1940 struct input_handle *handle, *next;
1942 mutex_lock(&input_mutex);
1944 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1945 handler->disconnect(handle);
1946 WARN_ON(!list_empty(&handler->h_list));
1948 list_del_init(&handler->node);
1950 if (handler->fops != NULL)
1951 input_table[handler->minor >> 5] = NULL;
1953 input_wakeup_procfs_readers();
1955 mutex_unlock(&input_mutex);
1957 EXPORT_SYMBOL(input_unregister_handler);
1960 * input_handler_for_each_handle - handle iterator
1961 * @handler: input handler to iterate
1962 * @data: data for the callback
1963 * @fn: function to be called for each handle
1965 * Iterate over @bus's list of devices, and call @fn for each, passing
1966 * it @data and stop when @fn returns a non-zero value. The function is
1967 * using RCU to traverse the list and therefore may be usind in atonic
1968 * contexts. The @fn callback is invoked from RCU critical section and
1969 * thus must not sleep.
1971 int input_handler_for_each_handle(struct input_handler *handler, void *data,
1972 int (*fn)(struct input_handle *, void *))
1974 struct input_handle *handle;
1979 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
1980 retval = fn(handle, data);
1989 EXPORT_SYMBOL(input_handler_for_each_handle);
1992 * input_register_handle - register a new input handle
1993 * @handle: handle to register
1995 * This function puts a new input handle onto device's
1996 * and handler's lists so that events can flow through
1997 * it once it is opened using input_open_device().
1999 * This function is supposed to be called from handler's
2002 int input_register_handle(struct input_handle *handle)
2004 struct input_handler *handler = handle->handler;
2005 struct input_dev *dev = handle->dev;
2009 * We take dev->mutex here to prevent race with
2010 * input_release_device().
2012 error = mutex_lock_interruptible(&dev->mutex);
2017 * Filters go to the head of the list, normal handlers
2020 if (handler->filter)
2021 list_add_rcu(&handle->d_node, &dev->h_list);
2023 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2025 mutex_unlock(&dev->mutex);
2028 * Since we are supposed to be called from ->connect()
2029 * which is mutually exclusive with ->disconnect()
2030 * we can't be racing with input_unregister_handle()
2031 * and so separate lock is not needed here.
2033 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2036 handler->start(handle);
2040 EXPORT_SYMBOL(input_register_handle);
2043 * input_unregister_handle - unregister an input handle
2044 * @handle: handle to unregister
2046 * This function removes input handle from device's
2047 * and handler's lists.
2049 * This function is supposed to be called from handler's
2050 * disconnect() method.
2052 void input_unregister_handle(struct input_handle *handle)
2054 struct input_dev *dev = handle->dev;
2056 list_del_rcu(&handle->h_node);
2059 * Take dev->mutex to prevent race with input_release_device().
2061 mutex_lock(&dev->mutex);
2062 list_del_rcu(&handle->d_node);
2063 mutex_unlock(&dev->mutex);
2067 EXPORT_SYMBOL(input_unregister_handle);
2069 static int input_open_file(struct inode *inode, struct file *file)
2071 struct input_handler *handler;
2072 const struct file_operations *old_fops, *new_fops = NULL;
2075 err = mutex_lock_interruptible(&input_mutex);
2079 /* No load-on-demand here? */
2080 handler = input_table[iminor(inode) >> 5];
2082 new_fops = fops_get(handler->fops);
2084 mutex_unlock(&input_mutex);
2087 * That's _really_ odd. Usually NULL ->open means "nothing special",
2088 * not "no device". Oh, well...
2090 if (!new_fops || !new_fops->open) {
2096 old_fops = file->f_op;
2097 file->f_op = new_fops;
2099 err = new_fops->open(inode, file);
2101 fops_put(file->f_op);
2102 file->f_op = fops_get(old_fops);
2109 static const struct file_operations input_fops = {
2110 .owner = THIS_MODULE,
2111 .open = input_open_file,
2112 .llseek = noop_llseek,
2115 static int __init input_init(void)
2119 err = class_register(&input_class);
2121 pr_err("unable to register input_dev class\n");
2125 err = input_proc_init();
2129 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2131 pr_err("unable to register char major %d", INPUT_MAJOR);
2137 fail2: input_proc_exit();
2138 fail1: class_unregister(&input_class);
2142 static void __exit input_exit(void)
2145 unregister_chrdev(INPUT_MAJOR, "input");
2146 class_unregister(&input_class);
2149 subsys_initcall(input_init);
2150 module_exit(input_exit);