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 unsigned int type, unsigned int code, int value)
80 struct input_handler *handler;
81 struct input_handle *handle;
85 handle = rcu_dereference(dev->grab);
87 handle->handler->event(handle, type, code, value);
89 bool filtered = false;
91 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
95 handler = handle->handler;
96 if (!handler->filter) {
100 handler->event(handle, type, code, value);
102 } else if (handler->filter(handle, type, code, value))
111 * Generate software autorepeat event. Note that we take
112 * dev->event_lock here to avoid racing with input_event
113 * which may cause keys get "stuck".
115 static void input_repeat_key(unsigned long data)
117 struct input_dev *dev = (void *) data;
120 spin_lock_irqsave(&dev->event_lock, flags);
122 if (test_bit(dev->repeat_key, dev->key) &&
123 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
125 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
129 * Only send SYN_REPORT if we are not in a middle
130 * of driver parsing a new hardware packet.
131 * Otherwise assume that the driver will send
132 * SYN_REPORT once it's done.
134 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
137 if (dev->rep[REP_PERIOD])
138 mod_timer(&dev->timer, jiffies +
139 msecs_to_jiffies(dev->rep[REP_PERIOD]));
142 spin_unlock_irqrestore(&dev->event_lock, flags);
145 static void input_start_autorepeat(struct input_dev *dev, int code)
147 if (test_bit(EV_REP, dev->evbit) &&
148 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
150 dev->repeat_key = code;
151 mod_timer(&dev->timer,
152 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
156 static void input_stop_autorepeat(struct input_dev *dev)
158 del_timer(&dev->timer);
161 #define INPUT_IGNORE_EVENT 0
162 #define INPUT_PASS_TO_HANDLERS 1
163 #define INPUT_PASS_TO_DEVICE 2
164 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
166 static int input_handle_abs_event(struct input_dev *dev,
167 unsigned int code, int *pval)
172 if (code == ABS_MT_SLOT) {
174 * "Stage" the event; we'll flush it later, when we
175 * get actual touch data.
177 if (*pval >= 0 && *pval < dev->mtsize)
180 return INPUT_IGNORE_EVENT;
183 is_mt_event = input_is_mt_value(code);
186 pold = &dev->absinfo[code].value;
187 } else if (dev->mt) {
188 struct input_mt_slot *mtslot = &dev->mt[dev->slot];
189 pold = &mtslot->abs[code - ABS_MT_FIRST];
192 * Bypass filtering for multi-touch events when
193 * not employing slots.
199 *pval = input_defuzz_abs_event(*pval, *pold,
200 dev->absinfo[code].fuzz);
202 return INPUT_IGNORE_EVENT;
207 /* Flush pending "slot" event */
208 if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
209 input_abs_set_val(dev, ABS_MT_SLOT, dev->slot);
210 input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot);
213 return INPUT_PASS_TO_HANDLERS;
216 static void input_handle_event(struct input_dev *dev,
217 unsigned int type, unsigned int code, int value)
219 int disposition = INPUT_IGNORE_EVENT;
226 disposition = INPUT_PASS_TO_ALL;
232 disposition = INPUT_PASS_TO_HANDLERS;
237 disposition = INPUT_PASS_TO_HANDLERS;
243 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
244 !!test_bit(code, dev->key) != value) {
247 __change_bit(code, dev->key);
249 input_start_autorepeat(dev, code);
251 input_stop_autorepeat(dev);
254 disposition = INPUT_PASS_TO_HANDLERS;
259 if (is_event_supported(code, dev->swbit, SW_MAX) &&
260 !!test_bit(code, dev->sw) != value) {
262 __change_bit(code, dev->sw);
263 disposition = INPUT_PASS_TO_HANDLERS;
268 if (is_event_supported(code, dev->absbit, ABS_MAX))
269 disposition = input_handle_abs_event(dev, code, &value);
274 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
275 disposition = INPUT_PASS_TO_HANDLERS;
280 if (is_event_supported(code, dev->mscbit, MSC_MAX))
281 disposition = INPUT_PASS_TO_ALL;
286 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
287 !!test_bit(code, dev->led) != value) {
289 __change_bit(code, dev->led);
290 disposition = INPUT_PASS_TO_ALL;
295 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
297 if (!!test_bit(code, dev->snd) != !!value)
298 __change_bit(code, dev->snd);
299 disposition = INPUT_PASS_TO_ALL;
304 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
305 dev->rep[code] = value;
306 disposition = INPUT_PASS_TO_ALL;
312 disposition = INPUT_PASS_TO_ALL;
316 disposition = INPUT_PASS_TO_ALL;
320 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
323 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
324 dev->event(dev, type, code, value);
326 if (disposition & INPUT_PASS_TO_HANDLERS)
327 input_pass_event(dev, type, code, value);
331 * input_event() - report new input event
332 * @dev: device that generated the event
333 * @type: type of the event
335 * @value: value of the event
337 * This function should be used by drivers implementing various input
338 * devices to report input events. See also input_inject_event().
340 * NOTE: input_event() may be safely used right after input device was
341 * allocated with input_allocate_device(), even before it is registered
342 * with input_register_device(), but the event will not reach any of the
343 * input handlers. Such early invocation of input_event() may be used
344 * to 'seed' initial state of a switch or initial position of absolute
347 void input_event(struct input_dev *dev,
348 unsigned int type, unsigned int code, int value)
352 if (is_event_supported(type, dev->evbit, EV_MAX)) {
354 spin_lock_irqsave(&dev->event_lock, flags);
355 add_input_randomness(type, code, value);
356 input_handle_event(dev, type, code, value);
357 spin_unlock_irqrestore(&dev->event_lock, flags);
360 EXPORT_SYMBOL(input_event);
363 * input_inject_event() - send input event from input handler
364 * @handle: input handle to send event through
365 * @type: type of the event
367 * @value: value of the event
369 * Similar to input_event() but will ignore event if device is
370 * "grabbed" and handle injecting event is not the one that owns
373 void input_inject_event(struct input_handle *handle,
374 unsigned int type, unsigned int code, int value)
376 struct input_dev *dev = handle->dev;
377 struct input_handle *grab;
380 if (is_event_supported(type, dev->evbit, EV_MAX)) {
381 spin_lock_irqsave(&dev->event_lock, flags);
384 grab = rcu_dereference(dev->grab);
385 if (!grab || grab == handle)
386 input_handle_event(dev, type, code, value);
389 spin_unlock_irqrestore(&dev->event_lock, flags);
392 EXPORT_SYMBOL(input_inject_event);
395 * input_alloc_absinfo - allocates array of input_absinfo structs
396 * @dev: the input device emitting absolute events
398 * If the absinfo struct the caller asked for is already allocated, this
399 * functions will not do anything.
401 void input_alloc_absinfo(struct input_dev *dev)
404 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
407 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
409 EXPORT_SYMBOL(input_alloc_absinfo);
411 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
412 int min, int max, int fuzz, int flat)
414 struct input_absinfo *absinfo;
416 input_alloc_absinfo(dev);
420 absinfo = &dev->absinfo[axis];
421 absinfo->minimum = min;
422 absinfo->maximum = max;
423 absinfo->fuzz = fuzz;
424 absinfo->flat = flat;
426 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
428 EXPORT_SYMBOL(input_set_abs_params);
432 * input_grab_device - grabs device for exclusive use
433 * @handle: input handle that wants to own the device
435 * When a device is grabbed by an input handle all events generated by
436 * the device are delivered only to this handle. Also events injected
437 * by other input handles are ignored while device is grabbed.
439 int input_grab_device(struct input_handle *handle)
441 struct input_dev *dev = handle->dev;
444 retval = mutex_lock_interruptible(&dev->mutex);
453 rcu_assign_pointer(dev->grab, handle);
456 mutex_unlock(&dev->mutex);
459 EXPORT_SYMBOL(input_grab_device);
461 static void __input_release_device(struct input_handle *handle)
463 struct input_dev *dev = handle->dev;
465 if (dev->grab == handle) {
466 rcu_assign_pointer(dev->grab, NULL);
467 /* Make sure input_pass_event() notices that grab is gone */
470 list_for_each_entry(handle, &dev->h_list, d_node)
471 if (handle->open && handle->handler->start)
472 handle->handler->start(handle);
477 * input_release_device - release previously grabbed device
478 * @handle: input handle that owns the device
480 * Releases previously grabbed device so that other input handles can
481 * start receiving input events. Upon release all handlers attached
482 * to the device have their start() method called so they have a change
483 * to synchronize device state with the rest of the system.
485 void input_release_device(struct input_handle *handle)
487 struct input_dev *dev = handle->dev;
489 mutex_lock(&dev->mutex);
490 __input_release_device(handle);
491 mutex_unlock(&dev->mutex);
493 EXPORT_SYMBOL(input_release_device);
496 * input_open_device - open input device
497 * @handle: handle through which device is being accessed
499 * This function should be called by input handlers when they
500 * want to start receive events from given input device.
502 int input_open_device(struct input_handle *handle)
504 struct input_dev *dev = handle->dev;
507 retval = mutex_lock_interruptible(&dev->mutex);
511 if (dev->going_away) {
518 if (!dev->users++ && dev->open)
519 retval = dev->open(dev);
523 if (!--handle->open) {
525 * Make sure we are not delivering any more events
526 * through this handle
533 mutex_unlock(&dev->mutex);
536 EXPORT_SYMBOL(input_open_device);
538 int input_flush_device(struct input_handle *handle, struct file *file)
540 struct input_dev *dev = handle->dev;
543 retval = mutex_lock_interruptible(&dev->mutex);
548 retval = dev->flush(dev, file);
550 mutex_unlock(&dev->mutex);
553 EXPORT_SYMBOL(input_flush_device);
556 * input_close_device - close input device
557 * @handle: handle through which device is being accessed
559 * This function should be called by input handlers when they
560 * want to stop receive events from given input device.
562 void input_close_device(struct input_handle *handle)
564 struct input_dev *dev = handle->dev;
566 mutex_lock(&dev->mutex);
568 __input_release_device(handle);
570 if (!--dev->users && dev->close)
573 if (!--handle->open) {
575 * synchronize_rcu() makes sure that input_pass_event()
576 * completed and that no more input events are delivered
577 * through this handle
582 mutex_unlock(&dev->mutex);
584 EXPORT_SYMBOL(input_close_device);
587 * Simulate keyup events for all keys that are marked as pressed.
588 * The function must be called with dev->event_lock held.
590 static void input_dev_release_keys(struct input_dev *dev)
594 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
595 for (code = 0; code <= KEY_MAX; code++) {
596 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
597 __test_and_clear_bit(code, dev->key)) {
598 input_pass_event(dev, EV_KEY, code, 0);
601 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
606 * Prepare device for unregistering
608 static void input_disconnect_device(struct input_dev *dev)
610 struct input_handle *handle;
613 * Mark device as going away. Note that we take dev->mutex here
614 * not to protect access to dev->going_away but rather to ensure
615 * that there are no threads in the middle of input_open_device()
617 mutex_lock(&dev->mutex);
618 dev->going_away = true;
619 mutex_unlock(&dev->mutex);
621 spin_lock_irq(&dev->event_lock);
624 * Simulate keyup events for all pressed keys so that handlers
625 * are not left with "stuck" keys. The driver may continue
626 * generate events even after we done here but they will not
627 * reach any handlers.
629 input_dev_release_keys(dev);
631 list_for_each_entry(handle, &dev->h_list, d_node)
634 spin_unlock_irq(&dev->event_lock);
638 * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
639 * @ke: keymap entry containing scancode to be converted.
640 * @scancode: pointer to the location where converted scancode should
643 * This function is used to convert scancode stored in &struct keymap_entry
644 * into scalar form understood by legacy keymap handling methods. These
645 * methods expect scancodes to be represented as 'unsigned int'.
647 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
648 unsigned int *scancode)
652 *scancode = *((u8 *)ke->scancode);
656 *scancode = *((u16 *)ke->scancode);
660 *scancode = *((u32 *)ke->scancode);
669 EXPORT_SYMBOL(input_scancode_to_scalar);
672 * Those routines handle the default case where no [gs]etkeycode() is
673 * defined. In this case, an array indexed by the scancode is used.
676 static unsigned int input_fetch_keycode(struct input_dev *dev,
679 switch (dev->keycodesize) {
681 return ((u8 *)dev->keycode)[index];
684 return ((u16 *)dev->keycode)[index];
687 return ((u32 *)dev->keycode)[index];
691 static int input_default_getkeycode(struct input_dev *dev,
692 struct input_keymap_entry *ke)
697 if (!dev->keycodesize)
700 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
703 error = input_scancode_to_scalar(ke, &index);
708 if (index >= dev->keycodemax)
711 ke->keycode = input_fetch_keycode(dev, index);
713 ke->len = sizeof(index);
714 memcpy(ke->scancode, &index, sizeof(index));
719 static int input_default_setkeycode(struct input_dev *dev,
720 const struct input_keymap_entry *ke,
721 unsigned int *old_keycode)
727 if (!dev->keycodesize)
730 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
733 error = input_scancode_to_scalar(ke, &index);
738 if (index >= dev->keycodemax)
741 if (dev->keycodesize < sizeof(ke->keycode) &&
742 (ke->keycode >> (dev->keycodesize * 8)))
745 switch (dev->keycodesize) {
747 u8 *k = (u8 *)dev->keycode;
748 *old_keycode = k[index];
749 k[index] = ke->keycode;
753 u16 *k = (u16 *)dev->keycode;
754 *old_keycode = k[index];
755 k[index] = ke->keycode;
759 u32 *k = (u32 *)dev->keycode;
760 *old_keycode = k[index];
761 k[index] = ke->keycode;
766 __clear_bit(*old_keycode, dev->keybit);
767 __set_bit(ke->keycode, dev->keybit);
769 for (i = 0; i < dev->keycodemax; i++) {
770 if (input_fetch_keycode(dev, i) == *old_keycode) {
771 __set_bit(*old_keycode, dev->keybit);
772 break; /* Setting the bit twice is useless, so break */
780 * input_get_keycode - retrieve keycode currently mapped to a given scancode
781 * @dev: input device which keymap is being queried
784 * This function should be called by anyone interested in retrieving current
785 * keymap. Presently evdev handlers use it.
787 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
792 spin_lock_irqsave(&dev->event_lock, flags);
793 retval = dev->getkeycode(dev, ke);
794 spin_unlock_irqrestore(&dev->event_lock, flags);
798 EXPORT_SYMBOL(input_get_keycode);
801 * input_set_keycode - attribute a keycode to a given scancode
802 * @dev: input device which keymap is being updated
803 * @ke: new keymap entry
805 * This function should be called by anyone needing to update current
806 * keymap. Presently keyboard and evdev handlers use it.
808 int input_set_keycode(struct input_dev *dev,
809 const struct input_keymap_entry *ke)
812 unsigned int old_keycode;
815 if (ke->keycode > KEY_MAX)
818 spin_lock_irqsave(&dev->event_lock, flags);
820 retval = dev->setkeycode(dev, ke, &old_keycode);
824 /* Make sure KEY_RESERVED did not get enabled. */
825 __clear_bit(KEY_RESERVED, dev->keybit);
828 * Simulate keyup event if keycode is not present
829 * in the keymap anymore
831 if (test_bit(EV_KEY, dev->evbit) &&
832 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
833 __test_and_clear_bit(old_keycode, dev->key)) {
835 input_pass_event(dev, EV_KEY, old_keycode, 0);
837 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
841 spin_unlock_irqrestore(&dev->event_lock, flags);
845 EXPORT_SYMBOL(input_set_keycode);
847 static const struct input_device_id *input_match_device(struct input_handler *handler,
848 struct input_dev *dev)
850 const struct input_device_id *id;
852 for (id = handler->id_table; id->flags || id->driver_info; id++) {
854 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
855 if (id->bustype != dev->id.bustype)
858 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
859 if (id->vendor != dev->id.vendor)
862 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
863 if (id->product != dev->id.product)
866 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
867 if (id->version != dev->id.version)
870 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
873 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
876 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
879 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
882 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
885 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
888 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
891 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
894 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
897 if (!handler->match || handler->match(handler, dev))
904 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
906 const struct input_device_id *id;
909 id = input_match_device(handler, dev);
913 error = handler->connect(handler, dev, id);
914 if (error && error != -ENODEV)
915 pr_err("failed to attach handler %s to device %s, error: %d\n",
916 handler->name, kobject_name(&dev->dev.kobj), error);
923 static int input_bits_to_string(char *buf, int buf_size,
924 unsigned long bits, bool skip_empty)
928 if (INPUT_COMPAT_TEST) {
929 u32 dword = bits >> 32;
930 if (dword || !skip_empty)
931 len += snprintf(buf, buf_size, "%x ", dword);
933 dword = bits & 0xffffffffUL;
934 if (dword || !skip_empty || len)
935 len += snprintf(buf + len, max(buf_size - len, 0),
938 if (bits || !skip_empty)
939 len += snprintf(buf, buf_size, "%lx", bits);
945 #else /* !CONFIG_COMPAT */
947 static int input_bits_to_string(char *buf, int buf_size,
948 unsigned long bits, bool skip_empty)
950 return bits || !skip_empty ?
951 snprintf(buf, buf_size, "%lx", bits) : 0;
956 #ifdef CONFIG_PROC_FS
958 static struct proc_dir_entry *proc_bus_input_dir;
959 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
960 static int input_devices_state;
962 static inline void input_wakeup_procfs_readers(void)
964 input_devices_state++;
965 wake_up(&input_devices_poll_wait);
968 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
970 poll_wait(file, &input_devices_poll_wait, wait);
971 if (file->f_version != input_devices_state) {
972 file->f_version = input_devices_state;
973 return POLLIN | POLLRDNORM;
979 union input_seq_state {
987 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
989 union input_seq_state *state = (union input_seq_state *)&seq->private;
992 /* We need to fit into seq->private pointer */
993 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
995 error = mutex_lock_interruptible(&input_mutex);
997 state->mutex_acquired = false;
998 return ERR_PTR(error);
1001 state->mutex_acquired = true;
1003 return seq_list_start(&input_dev_list, *pos);
1006 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1008 return seq_list_next(v, &input_dev_list, pos);
1011 static void input_seq_stop(struct seq_file *seq, void *v)
1013 union input_seq_state *state = (union input_seq_state *)&seq->private;
1015 if (state->mutex_acquired)
1016 mutex_unlock(&input_mutex);
1019 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1020 unsigned long *bitmap, int max)
1023 bool skip_empty = true;
1026 seq_printf(seq, "B: %s=", name);
1028 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1029 if (input_bits_to_string(buf, sizeof(buf),
1030 bitmap[i], skip_empty)) {
1032 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1037 * If no output was produced print a single 0.
1042 seq_putc(seq, '\n');
1045 static int input_devices_seq_show(struct seq_file *seq, void *v)
1047 struct input_dev *dev = container_of(v, struct input_dev, node);
1048 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1049 struct input_handle *handle;
1051 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1052 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1054 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1055 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1056 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1057 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1058 seq_printf(seq, "H: Handlers=");
1060 list_for_each_entry(handle, &dev->h_list, d_node)
1061 seq_printf(seq, "%s ", handle->name);
1062 seq_putc(seq, '\n');
1064 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1066 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1067 if (test_bit(EV_KEY, dev->evbit))
1068 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1069 if (test_bit(EV_REL, dev->evbit))
1070 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1071 if (test_bit(EV_ABS, dev->evbit))
1072 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1073 if (test_bit(EV_MSC, dev->evbit))
1074 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1075 if (test_bit(EV_LED, dev->evbit))
1076 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1077 if (test_bit(EV_SND, dev->evbit))
1078 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1079 if (test_bit(EV_FF, dev->evbit))
1080 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1081 if (test_bit(EV_SW, dev->evbit))
1082 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1084 seq_putc(seq, '\n');
1090 static const struct seq_operations input_devices_seq_ops = {
1091 .start = input_devices_seq_start,
1092 .next = input_devices_seq_next,
1093 .stop = input_seq_stop,
1094 .show = input_devices_seq_show,
1097 static int input_proc_devices_open(struct inode *inode, struct file *file)
1099 return seq_open(file, &input_devices_seq_ops);
1102 static const struct file_operations input_devices_fileops = {
1103 .owner = THIS_MODULE,
1104 .open = input_proc_devices_open,
1105 .poll = input_proc_devices_poll,
1107 .llseek = seq_lseek,
1108 .release = seq_release,
1111 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1113 union input_seq_state *state = (union input_seq_state *)&seq->private;
1116 /* We need to fit into seq->private pointer */
1117 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1119 error = mutex_lock_interruptible(&input_mutex);
1121 state->mutex_acquired = false;
1122 return ERR_PTR(error);
1125 state->mutex_acquired = true;
1128 return seq_list_start(&input_handler_list, *pos);
1131 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1133 union input_seq_state *state = (union input_seq_state *)&seq->private;
1135 state->pos = *pos + 1;
1136 return seq_list_next(v, &input_handler_list, pos);
1139 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1141 struct input_handler *handler = container_of(v, struct input_handler, node);
1142 union input_seq_state *state = (union input_seq_state *)&seq->private;
1144 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1145 if (handler->filter)
1146 seq_puts(seq, " (filter)");
1148 seq_printf(seq, " Minor=%d", handler->minor);
1149 seq_putc(seq, '\n');
1154 static const struct seq_operations input_handlers_seq_ops = {
1155 .start = input_handlers_seq_start,
1156 .next = input_handlers_seq_next,
1157 .stop = input_seq_stop,
1158 .show = input_handlers_seq_show,
1161 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1163 return seq_open(file, &input_handlers_seq_ops);
1166 static const struct file_operations input_handlers_fileops = {
1167 .owner = THIS_MODULE,
1168 .open = input_proc_handlers_open,
1170 .llseek = seq_lseek,
1171 .release = seq_release,
1174 static int __init input_proc_init(void)
1176 struct proc_dir_entry *entry;
1178 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1179 if (!proc_bus_input_dir)
1182 entry = proc_create("devices", 0, proc_bus_input_dir,
1183 &input_devices_fileops);
1187 entry = proc_create("handlers", 0, proc_bus_input_dir,
1188 &input_handlers_fileops);
1194 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1195 fail1: remove_proc_entry("bus/input", NULL);
1199 static void input_proc_exit(void)
1201 remove_proc_entry("devices", proc_bus_input_dir);
1202 remove_proc_entry("handlers", proc_bus_input_dir);
1203 remove_proc_entry("bus/input", NULL);
1206 #else /* !CONFIG_PROC_FS */
1207 static inline void input_wakeup_procfs_readers(void) { }
1208 static inline int input_proc_init(void) { return 0; }
1209 static inline void input_proc_exit(void) { }
1212 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
1213 static ssize_t input_dev_show_##name(struct device *dev, \
1214 struct device_attribute *attr, \
1217 struct input_dev *input_dev = to_input_dev(dev); \
1219 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1220 input_dev->name ? input_dev->name : ""); \
1222 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1224 INPUT_DEV_STRING_ATTR_SHOW(name);
1225 INPUT_DEV_STRING_ATTR_SHOW(phys);
1226 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1228 static int input_print_modalias_bits(char *buf, int size,
1229 char name, unsigned long *bm,
1230 unsigned int min_bit, unsigned int max_bit)
1234 len += snprintf(buf, max(size, 0), "%c", name);
1235 for (i = min_bit; i < max_bit; i++)
1236 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1237 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1241 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1246 len = snprintf(buf, max(size, 0),
1247 "input:b%04Xv%04Xp%04Xe%04X-",
1248 id->id.bustype, id->id.vendor,
1249 id->id.product, id->id.version);
1251 len += input_print_modalias_bits(buf + len, size - len,
1252 'e', id->evbit, 0, EV_MAX);
1253 len += input_print_modalias_bits(buf + len, size - len,
1254 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1255 len += input_print_modalias_bits(buf + len, size - len,
1256 'r', id->relbit, 0, REL_MAX);
1257 len += input_print_modalias_bits(buf + len, size - len,
1258 'a', id->absbit, 0, ABS_MAX);
1259 len += input_print_modalias_bits(buf + len, size - len,
1260 'm', id->mscbit, 0, MSC_MAX);
1261 len += input_print_modalias_bits(buf + len, size - len,
1262 'l', id->ledbit, 0, LED_MAX);
1263 len += input_print_modalias_bits(buf + len, size - len,
1264 's', id->sndbit, 0, SND_MAX);
1265 len += input_print_modalias_bits(buf + len, size - len,
1266 'f', id->ffbit, 0, FF_MAX);
1267 len += input_print_modalias_bits(buf + len, size - len,
1268 'w', id->swbit, 0, SW_MAX);
1271 len += snprintf(buf + len, max(size - len, 0), "\n");
1276 static ssize_t input_dev_show_modalias(struct device *dev,
1277 struct device_attribute *attr,
1280 struct input_dev *id = to_input_dev(dev);
1283 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1285 return min_t(int, len, PAGE_SIZE);
1287 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1289 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1290 int max, int add_cr);
1292 static ssize_t input_dev_show_properties(struct device *dev,
1293 struct device_attribute *attr,
1296 struct input_dev *input_dev = to_input_dev(dev);
1297 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1298 INPUT_PROP_MAX, true);
1299 return min_t(int, len, PAGE_SIZE);
1301 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1303 static struct attribute *input_dev_attrs[] = {
1304 &dev_attr_name.attr,
1305 &dev_attr_phys.attr,
1306 &dev_attr_uniq.attr,
1307 &dev_attr_modalias.attr,
1308 &dev_attr_properties.attr,
1312 static struct attribute_group input_dev_attr_group = {
1313 .attrs = input_dev_attrs,
1316 #define INPUT_DEV_ID_ATTR(name) \
1317 static ssize_t input_dev_show_id_##name(struct device *dev, \
1318 struct device_attribute *attr, \
1321 struct input_dev *input_dev = to_input_dev(dev); \
1322 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1324 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1326 INPUT_DEV_ID_ATTR(bustype);
1327 INPUT_DEV_ID_ATTR(vendor);
1328 INPUT_DEV_ID_ATTR(product);
1329 INPUT_DEV_ID_ATTR(version);
1331 static struct attribute *input_dev_id_attrs[] = {
1332 &dev_attr_bustype.attr,
1333 &dev_attr_vendor.attr,
1334 &dev_attr_product.attr,
1335 &dev_attr_version.attr,
1339 static struct attribute_group input_dev_id_attr_group = {
1341 .attrs = input_dev_id_attrs,
1344 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1345 int max, int add_cr)
1349 bool skip_empty = true;
1351 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1352 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1353 bitmap[i], skip_empty);
1357 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1362 * If no output was produced print a single 0.
1365 len = snprintf(buf, buf_size, "%d", 0);
1368 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1373 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1374 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1375 struct device_attribute *attr, \
1378 struct input_dev *input_dev = to_input_dev(dev); \
1379 int len = input_print_bitmap(buf, PAGE_SIZE, \
1380 input_dev->bm##bit, ev##_MAX, \
1382 return min_t(int, len, PAGE_SIZE); \
1384 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1386 INPUT_DEV_CAP_ATTR(EV, ev);
1387 INPUT_DEV_CAP_ATTR(KEY, key);
1388 INPUT_DEV_CAP_ATTR(REL, rel);
1389 INPUT_DEV_CAP_ATTR(ABS, abs);
1390 INPUT_DEV_CAP_ATTR(MSC, msc);
1391 INPUT_DEV_CAP_ATTR(LED, led);
1392 INPUT_DEV_CAP_ATTR(SND, snd);
1393 INPUT_DEV_CAP_ATTR(FF, ff);
1394 INPUT_DEV_CAP_ATTR(SW, sw);
1396 static struct attribute *input_dev_caps_attrs[] = {
1409 static struct attribute_group input_dev_caps_attr_group = {
1410 .name = "capabilities",
1411 .attrs = input_dev_caps_attrs,
1414 static const struct attribute_group *input_dev_attr_groups[] = {
1415 &input_dev_attr_group,
1416 &input_dev_id_attr_group,
1417 &input_dev_caps_attr_group,
1421 static void input_dev_release(struct device *device)
1423 struct input_dev *dev = to_input_dev(device);
1425 input_ff_destroy(dev);
1426 input_mt_destroy_slots(dev);
1427 kfree(dev->absinfo);
1430 module_put(THIS_MODULE);
1434 * Input uevent interface - loading event handlers based on
1437 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1438 const char *name, unsigned long *bitmap, int max)
1442 if (add_uevent_var(env, "%s", name))
1445 len = input_print_bitmap(&env->buf[env->buflen - 1],
1446 sizeof(env->buf) - env->buflen,
1447 bitmap, max, false);
1448 if (len >= (sizeof(env->buf) - env->buflen))
1455 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1456 struct input_dev *dev)
1460 if (add_uevent_var(env, "MODALIAS="))
1463 len = input_print_modalias(&env->buf[env->buflen - 1],
1464 sizeof(env->buf) - env->buflen,
1466 if (len >= (sizeof(env->buf) - env->buflen))
1473 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1475 int err = add_uevent_var(env, fmt, val); \
1480 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1482 int err = input_add_uevent_bm_var(env, name, bm, max); \
1487 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1489 int err = input_add_uevent_modalias_var(env, dev); \
1494 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1496 struct input_dev *dev = to_input_dev(device);
1498 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1499 dev->id.bustype, dev->id.vendor,
1500 dev->id.product, dev->id.version);
1502 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1504 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1506 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1508 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1510 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1511 if (test_bit(EV_KEY, dev->evbit))
1512 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1513 if (test_bit(EV_REL, dev->evbit))
1514 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1515 if (test_bit(EV_ABS, dev->evbit))
1516 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1517 if (test_bit(EV_MSC, dev->evbit))
1518 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1519 if (test_bit(EV_LED, dev->evbit))
1520 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1521 if (test_bit(EV_SND, dev->evbit))
1522 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1523 if (test_bit(EV_FF, dev->evbit))
1524 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1525 if (test_bit(EV_SW, dev->evbit))
1526 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1528 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1533 #define INPUT_DO_TOGGLE(dev, type, bits, on) \
1538 if (!test_bit(EV_##type, dev->evbit)) \
1541 for (i = 0; i < type##_MAX; i++) { \
1542 if (!test_bit(i, dev->bits##bit)) \
1545 active = test_bit(i, dev->bits); \
1546 if (!active && !on) \
1549 dev->event(dev, EV_##type, i, on ? active : 0); \
1553 static void input_dev_toggle(struct input_dev *dev, bool activate)
1558 INPUT_DO_TOGGLE(dev, LED, led, activate);
1559 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1561 if (activate && test_bit(EV_REP, dev->evbit)) {
1562 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1563 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1568 * input_reset_device() - reset/restore the state of input device
1569 * @dev: input device whose state needs to be reset
1571 * This function tries to reset the state of an opened input device and
1572 * bring internal state and state if the hardware in sync with each other.
1573 * We mark all keys as released, restore LED state, repeat rate, etc.
1575 void input_reset_device(struct input_dev *dev)
1577 mutex_lock(&dev->mutex);
1580 input_dev_toggle(dev, true);
1583 * Keys that have been pressed at suspend time are unlikely
1584 * to be still pressed when we resume.
1586 spin_lock_irq(&dev->event_lock);
1587 input_dev_release_keys(dev);
1588 spin_unlock_irq(&dev->event_lock);
1591 mutex_unlock(&dev->mutex);
1593 EXPORT_SYMBOL(input_reset_device);
1596 static int input_dev_suspend(struct device *dev)
1598 struct input_dev *input_dev = to_input_dev(dev);
1600 mutex_lock(&input_dev->mutex);
1602 if (input_dev->users)
1603 input_dev_toggle(input_dev, false);
1605 mutex_unlock(&input_dev->mutex);
1610 static int input_dev_resume(struct device *dev)
1612 struct input_dev *input_dev = to_input_dev(dev);
1614 input_reset_device(input_dev);
1619 static const struct dev_pm_ops input_dev_pm_ops = {
1620 .suspend = input_dev_suspend,
1621 .resume = input_dev_resume,
1622 .poweroff = input_dev_suspend,
1623 .restore = input_dev_resume,
1625 #endif /* CONFIG_PM */
1627 static struct device_type input_dev_type = {
1628 .groups = input_dev_attr_groups,
1629 .release = input_dev_release,
1630 .uevent = input_dev_uevent,
1632 .pm = &input_dev_pm_ops,
1636 static char *input_devnode(struct device *dev, umode_t *mode)
1638 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1641 struct class input_class = {
1643 .devnode = input_devnode,
1645 EXPORT_SYMBOL_GPL(input_class);
1648 * input_allocate_device - allocate memory for new input device
1650 * Returns prepared struct input_dev or NULL.
1652 * NOTE: Use input_free_device() to free devices that have not been
1653 * registered; input_unregister_device() should be used for already
1654 * registered devices.
1656 struct input_dev *input_allocate_device(void)
1658 struct input_dev *dev;
1660 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1662 dev->dev.type = &input_dev_type;
1663 dev->dev.class = &input_class;
1664 device_initialize(&dev->dev);
1665 mutex_init(&dev->mutex);
1666 spin_lock_init(&dev->event_lock);
1667 INIT_LIST_HEAD(&dev->h_list);
1668 INIT_LIST_HEAD(&dev->node);
1670 __module_get(THIS_MODULE);
1675 EXPORT_SYMBOL(input_allocate_device);
1678 * input_free_device - free memory occupied by input_dev structure
1679 * @dev: input device to free
1681 * This function should only be used if input_register_device()
1682 * was not called yet or if it failed. Once device was registered
1683 * use input_unregister_device() and memory will be freed once last
1684 * reference to the device is dropped.
1686 * Device should be allocated by input_allocate_device().
1688 * NOTE: If there are references to the input device then memory
1689 * will not be freed until last reference is dropped.
1691 void input_free_device(struct input_dev *dev)
1694 input_put_device(dev);
1696 EXPORT_SYMBOL(input_free_device);
1699 * input_set_capability - mark device as capable of a certain event
1700 * @dev: device that is capable of emitting or accepting event
1701 * @type: type of the event (EV_KEY, EV_REL, etc...)
1704 * In addition to setting up corresponding bit in appropriate capability
1705 * bitmap the function also adjusts dev->evbit.
1707 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1711 __set_bit(code, dev->keybit);
1715 __set_bit(code, dev->relbit);
1719 __set_bit(code, dev->absbit);
1723 __set_bit(code, dev->mscbit);
1727 __set_bit(code, dev->swbit);
1731 __set_bit(code, dev->ledbit);
1735 __set_bit(code, dev->sndbit);
1739 __set_bit(code, dev->ffbit);
1747 pr_err("input_set_capability: unknown type %u (code %u)\n",
1753 __set_bit(type, dev->evbit);
1755 EXPORT_SYMBOL(input_set_capability);
1757 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1761 unsigned int events;
1764 mt_slots = dev->mtsize;
1765 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1766 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1767 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1768 mt_slots = clamp(mt_slots, 2, 32);
1769 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1775 events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1777 for (i = 0; i < ABS_CNT; i++) {
1778 if (test_bit(i, dev->absbit)) {
1779 if (input_is_mt_axis(i))
1786 for (i = 0; i < REL_CNT; i++)
1787 if (test_bit(i, dev->relbit))
1793 #define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1795 if (!test_bit(EV_##type, dev->evbit)) \
1796 memset(dev->bits##bit, 0, \
1797 sizeof(dev->bits##bit)); \
1800 static void input_cleanse_bitmasks(struct input_dev *dev)
1802 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1803 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1804 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1805 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1806 INPUT_CLEANSE_BITMASK(dev, LED, led);
1807 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1808 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1809 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1813 * input_register_device - register device with input core
1814 * @dev: device to be registered
1816 * This function registers device with input core. The device must be
1817 * allocated with input_allocate_device() and all it's capabilities
1818 * set up before registering.
1819 * If function fails the device must be freed with input_free_device().
1820 * Once device has been successfully registered it can be unregistered
1821 * with input_unregister_device(); input_free_device() should not be
1822 * called in this case.
1824 int input_register_device(struct input_dev *dev)
1826 static atomic_t input_no = ATOMIC_INIT(0);
1827 struct input_handler *handler;
1831 /* Every input device generates EV_SYN/SYN_REPORT events. */
1832 __set_bit(EV_SYN, dev->evbit);
1834 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1835 __clear_bit(KEY_RESERVED, dev->keybit);
1837 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1838 input_cleanse_bitmasks(dev);
1840 if (!dev->hint_events_per_packet)
1841 dev->hint_events_per_packet =
1842 input_estimate_events_per_packet(dev);
1845 * If delay and period are pre-set by the driver, then autorepeating
1846 * is handled by the driver itself and we don't do it in input.c.
1848 init_timer(&dev->timer);
1849 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1850 dev->timer.data = (long) dev;
1851 dev->timer.function = input_repeat_key;
1852 dev->rep[REP_DELAY] = 250;
1853 dev->rep[REP_PERIOD] = 33;
1856 if (!dev->getkeycode)
1857 dev->getkeycode = input_default_getkeycode;
1859 if (!dev->setkeycode)
1860 dev->setkeycode = input_default_setkeycode;
1862 dev_set_name(&dev->dev, "input%ld",
1863 (unsigned long) atomic_inc_return(&input_no) - 1);
1865 error = device_add(&dev->dev);
1869 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1870 pr_info("%s as %s\n",
1871 dev->name ? dev->name : "Unspecified device",
1872 path ? path : "N/A");
1875 error = mutex_lock_interruptible(&input_mutex);
1877 device_del(&dev->dev);
1881 list_add_tail(&dev->node, &input_dev_list);
1883 list_for_each_entry(handler, &input_handler_list, node)
1884 input_attach_handler(dev, handler);
1886 input_wakeup_procfs_readers();
1888 mutex_unlock(&input_mutex);
1892 EXPORT_SYMBOL(input_register_device);
1895 * input_unregister_device - unregister previously registered device
1896 * @dev: device to be unregistered
1898 * This function unregisters an input device. Once device is unregistered
1899 * the caller should not try to access it as it may get freed at any moment.
1901 void input_unregister_device(struct input_dev *dev)
1903 struct input_handle *handle, *next;
1905 input_disconnect_device(dev);
1907 mutex_lock(&input_mutex);
1909 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1910 handle->handler->disconnect(handle);
1911 WARN_ON(!list_empty(&dev->h_list));
1913 del_timer_sync(&dev->timer);
1914 list_del_init(&dev->node);
1916 input_wakeup_procfs_readers();
1918 mutex_unlock(&input_mutex);
1920 device_unregister(&dev->dev);
1922 EXPORT_SYMBOL(input_unregister_device);
1925 * input_register_handler - register a new input handler
1926 * @handler: handler to be registered
1928 * This function registers a new input handler (interface) for input
1929 * devices in the system and attaches it to all input devices that
1930 * are compatible with the handler.
1932 int input_register_handler(struct input_handler *handler)
1934 struct input_dev *dev;
1937 retval = mutex_lock_interruptible(&input_mutex);
1941 INIT_LIST_HEAD(&handler->h_list);
1943 if (handler->fops != NULL) {
1944 if (input_table[handler->minor >> 5]) {
1948 input_table[handler->minor >> 5] = handler;
1951 list_add_tail(&handler->node, &input_handler_list);
1953 list_for_each_entry(dev, &input_dev_list, node)
1954 input_attach_handler(dev, handler);
1956 input_wakeup_procfs_readers();
1959 mutex_unlock(&input_mutex);
1962 EXPORT_SYMBOL(input_register_handler);
1965 * input_unregister_handler - unregisters an input handler
1966 * @handler: handler to be unregistered
1968 * This function disconnects a handler from its input devices and
1969 * removes it from lists of known handlers.
1971 void input_unregister_handler(struct input_handler *handler)
1973 struct input_handle *handle, *next;
1975 mutex_lock(&input_mutex);
1977 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1978 handler->disconnect(handle);
1979 WARN_ON(!list_empty(&handler->h_list));
1981 list_del_init(&handler->node);
1983 if (handler->fops != NULL)
1984 input_table[handler->minor >> 5] = NULL;
1986 input_wakeup_procfs_readers();
1988 mutex_unlock(&input_mutex);
1990 EXPORT_SYMBOL(input_unregister_handler);
1993 * input_handler_for_each_handle - handle iterator
1994 * @handler: input handler to iterate
1995 * @data: data for the callback
1996 * @fn: function to be called for each handle
1998 * Iterate over @bus's list of devices, and call @fn for each, passing
1999 * it @data and stop when @fn returns a non-zero value. The function is
2000 * using RCU to traverse the list and therefore may be usind in atonic
2001 * contexts. The @fn callback is invoked from RCU critical section and
2002 * thus must not sleep.
2004 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2005 int (*fn)(struct input_handle *, void *))
2007 struct input_handle *handle;
2012 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2013 retval = fn(handle, data);
2022 EXPORT_SYMBOL(input_handler_for_each_handle);
2025 * input_register_handle - register a new input handle
2026 * @handle: handle to register
2028 * This function puts a new input handle onto device's
2029 * and handler's lists so that events can flow through
2030 * it once it is opened using input_open_device().
2032 * This function is supposed to be called from handler's
2035 int input_register_handle(struct input_handle *handle)
2037 struct input_handler *handler = handle->handler;
2038 struct input_dev *dev = handle->dev;
2042 * We take dev->mutex here to prevent race with
2043 * input_release_device().
2045 error = mutex_lock_interruptible(&dev->mutex);
2050 * Filters go to the head of the list, normal handlers
2053 if (handler->filter)
2054 list_add_rcu(&handle->d_node, &dev->h_list);
2056 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2058 mutex_unlock(&dev->mutex);
2061 * Since we are supposed to be called from ->connect()
2062 * which is mutually exclusive with ->disconnect()
2063 * we can't be racing with input_unregister_handle()
2064 * and so separate lock is not needed here.
2066 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2069 handler->start(handle);
2073 EXPORT_SYMBOL(input_register_handle);
2076 * input_unregister_handle - unregister an input handle
2077 * @handle: handle to unregister
2079 * This function removes input handle from device's
2080 * and handler's lists.
2082 * This function is supposed to be called from handler's
2083 * disconnect() method.
2085 void input_unregister_handle(struct input_handle *handle)
2087 struct input_dev *dev = handle->dev;
2089 list_del_rcu(&handle->h_node);
2092 * Take dev->mutex to prevent race with input_release_device().
2094 mutex_lock(&dev->mutex);
2095 list_del_rcu(&handle->d_node);
2096 mutex_unlock(&dev->mutex);
2100 EXPORT_SYMBOL(input_unregister_handle);
2102 static int input_open_file(struct inode *inode, struct file *file)
2104 struct input_handler *handler;
2105 const struct file_operations *old_fops, *new_fops = NULL;
2108 err = mutex_lock_interruptible(&input_mutex);
2112 /* No load-on-demand here? */
2113 handler = input_table[iminor(inode) >> 5];
2115 new_fops = fops_get(handler->fops);
2117 mutex_unlock(&input_mutex);
2120 * That's _really_ odd. Usually NULL ->open means "nothing special",
2121 * not "no device". Oh, well...
2123 if (!new_fops || !new_fops->open) {
2129 old_fops = file->f_op;
2130 file->f_op = new_fops;
2132 err = new_fops->open(inode, file);
2134 fops_put(file->f_op);
2135 file->f_op = fops_get(old_fops);
2142 static const struct file_operations input_fops = {
2143 .owner = THIS_MODULE,
2144 .open = input_open_file,
2145 .llseek = noop_llseek,
2148 static int __init input_init(void)
2152 err = class_register(&input_class);
2154 pr_err("unable to register input_dev class\n");
2158 err = input_proc_init();
2162 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2164 pr_err("unable to register char major %d", INPUT_MAJOR);
2170 fail2: input_proc_exit();
2171 fail1: class_unregister(&input_class);
2175 static void __exit input_exit(void)
2178 unregister_chrdev(INPUT_MAJOR, "input");
2179 class_unregister(&input_class);
2182 subsys_initcall(input_init);
2183 module_exit(input_exit);