4 * Copyright (c) 1999-2002 Vojtech Pavlik
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
13 #include <linux/init.h>
14 #include <linux/input.h>
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/major.h>
18 #include <linux/proc_fs.h>
19 #include <linux/seq_file.h>
20 #include <linux/poll.h>
21 #include <linux/device.h>
22 #include <linux/mutex.h>
23 #include <linux/rcupdate.h>
24 #include <linux/smp_lock.h>
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
30 #define INPUT_DEVICES 256
33 * EV_ABS events which should not be cached are listed here.
35 static unsigned int input_abs_bypass_init_data[] __initdata = {
48 static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
50 static LIST_HEAD(input_dev_list);
51 static LIST_HEAD(input_handler_list);
54 * input_mutex protects access to both input_dev_list and input_handler_list.
55 * This also causes input_[un]register_device and input_[un]register_handler
56 * be mutually exclusive which simplifies locking in drivers implementing
59 static DEFINE_MUTEX(input_mutex);
61 static struct input_handler *input_table[8];
63 static inline int is_event_supported(unsigned int code,
64 unsigned long *bm, unsigned int max)
66 return code <= max && test_bit(code, bm);
69 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
72 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
75 if (value > old_val - fuzz && value < old_val + fuzz)
76 return (old_val * 3 + value) / 4;
78 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
79 return (old_val + value) / 2;
86 * Pass event through all open handles. This function is called with
87 * dev->event_lock held and interrupts disabled.
89 static void input_pass_event(struct input_dev *dev,
90 unsigned int type, unsigned int code, int value)
92 struct input_handle *handle;
96 handle = rcu_dereference(dev->grab);
98 handle->handler->event(handle, type, code, value);
100 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
102 handle->handler->event(handle,
108 * Generate software autorepeat event. Note that we take
109 * dev->event_lock here to avoid racing with input_event
110 * which may cause keys get "stuck".
112 static void input_repeat_key(unsigned long data)
114 struct input_dev *dev = (void *) data;
117 spin_lock_irqsave(&dev->event_lock, flags);
119 if (test_bit(dev->repeat_key, dev->key) &&
120 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
122 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
126 * Only send SYN_REPORT if we are not in a middle
127 * of driver parsing a new hardware packet.
128 * Otherwise assume that the driver will send
129 * SYN_REPORT once it's done.
131 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
134 if (dev->rep[REP_PERIOD])
135 mod_timer(&dev->timer, jiffies +
136 msecs_to_jiffies(dev->rep[REP_PERIOD]));
139 spin_unlock_irqrestore(&dev->event_lock, flags);
142 static void input_start_autorepeat(struct input_dev *dev, int code)
144 if (test_bit(EV_REP, dev->evbit) &&
145 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
147 dev->repeat_key = code;
148 mod_timer(&dev->timer,
149 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
153 static void input_stop_autorepeat(struct input_dev *dev)
155 del_timer(&dev->timer);
158 #define INPUT_IGNORE_EVENT 0
159 #define INPUT_PASS_TO_HANDLERS 1
160 #define INPUT_PASS_TO_DEVICE 2
161 #define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
163 static void input_handle_event(struct input_dev *dev,
164 unsigned int type, unsigned int code, int value)
166 int disposition = INPUT_IGNORE_EVENT;
173 disposition = INPUT_PASS_TO_ALL;
179 disposition = INPUT_PASS_TO_HANDLERS;
184 disposition = INPUT_PASS_TO_HANDLERS;
190 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
191 !!test_bit(code, dev->key) != value) {
194 __change_bit(code, dev->key);
196 input_start_autorepeat(dev, code);
198 input_stop_autorepeat(dev);
201 disposition = INPUT_PASS_TO_HANDLERS;
206 if (is_event_supported(code, dev->swbit, SW_MAX) &&
207 !!test_bit(code, dev->sw) != value) {
209 __change_bit(code, dev->sw);
210 disposition = INPUT_PASS_TO_HANDLERS;
215 if (is_event_supported(code, dev->absbit, ABS_MAX)) {
217 if (test_bit(code, input_abs_bypass)) {
218 disposition = INPUT_PASS_TO_HANDLERS;
222 value = input_defuzz_abs_event(value,
223 dev->abs[code], dev->absfuzz[code]);
225 if (dev->abs[code] != value) {
226 dev->abs[code] = value;
227 disposition = INPUT_PASS_TO_HANDLERS;
233 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
234 disposition = INPUT_PASS_TO_HANDLERS;
239 if (is_event_supported(code, dev->mscbit, MSC_MAX))
240 disposition = INPUT_PASS_TO_ALL;
245 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
246 !!test_bit(code, dev->led) != value) {
248 __change_bit(code, dev->led);
249 disposition = INPUT_PASS_TO_ALL;
254 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
256 if (!!test_bit(code, dev->snd) != !!value)
257 __change_bit(code, dev->snd);
258 disposition = INPUT_PASS_TO_ALL;
263 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
264 dev->rep[code] = value;
265 disposition = INPUT_PASS_TO_ALL;
271 disposition = INPUT_PASS_TO_ALL;
275 disposition = INPUT_PASS_TO_ALL;
279 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
282 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
283 dev->event(dev, type, code, value);
285 if (disposition & INPUT_PASS_TO_HANDLERS)
286 input_pass_event(dev, type, code, value);
290 * input_event() - report new input event
291 * @dev: device that generated the event
292 * @type: type of the event
294 * @value: value of the event
296 * This function should be used by drivers implementing various input
297 * devices. See also input_inject_event().
300 void input_event(struct input_dev *dev,
301 unsigned int type, unsigned int code, int value)
305 if (is_event_supported(type, dev->evbit, EV_MAX)) {
307 spin_lock_irqsave(&dev->event_lock, flags);
308 add_input_randomness(type, code, value);
309 input_handle_event(dev, type, code, value);
310 spin_unlock_irqrestore(&dev->event_lock, flags);
313 EXPORT_SYMBOL(input_event);
316 * input_inject_event() - send input event from input handler
317 * @handle: input handle to send event through
318 * @type: type of the event
320 * @value: value of the event
322 * Similar to input_event() but will ignore event if device is
323 * "grabbed" and handle injecting event is not the one that owns
326 void input_inject_event(struct input_handle *handle,
327 unsigned int type, unsigned int code, int value)
329 struct input_dev *dev = handle->dev;
330 struct input_handle *grab;
333 if (is_event_supported(type, dev->evbit, EV_MAX)) {
334 spin_lock_irqsave(&dev->event_lock, flags);
337 grab = rcu_dereference(dev->grab);
338 if (!grab || grab == handle)
339 input_handle_event(dev, type, code, value);
342 spin_unlock_irqrestore(&dev->event_lock, flags);
345 EXPORT_SYMBOL(input_inject_event);
348 * input_grab_device - grabs device for exclusive use
349 * @handle: input handle that wants to own the device
351 * When a device is grabbed by an input handle all events generated by
352 * the device are delivered only to this handle. Also events injected
353 * by other input handles are ignored while device is grabbed.
355 int input_grab_device(struct input_handle *handle)
357 struct input_dev *dev = handle->dev;
360 retval = mutex_lock_interruptible(&dev->mutex);
369 rcu_assign_pointer(dev->grab, handle);
373 mutex_unlock(&dev->mutex);
376 EXPORT_SYMBOL(input_grab_device);
378 static void __input_release_device(struct input_handle *handle)
380 struct input_dev *dev = handle->dev;
382 if (dev->grab == handle) {
383 rcu_assign_pointer(dev->grab, NULL);
384 /* Make sure input_pass_event() notices that grab is gone */
387 list_for_each_entry(handle, &dev->h_list, d_node)
388 if (handle->open && handle->handler->start)
389 handle->handler->start(handle);
394 * input_release_device - release previously grabbed device
395 * @handle: input handle that owns the device
397 * Releases previously grabbed device so that other input handles can
398 * start receiving input events. Upon release all handlers attached
399 * to the device have their start() method called so they have a change
400 * to synchronize device state with the rest of the system.
402 void input_release_device(struct input_handle *handle)
404 struct input_dev *dev = handle->dev;
406 mutex_lock(&dev->mutex);
407 __input_release_device(handle);
408 mutex_unlock(&dev->mutex);
410 EXPORT_SYMBOL(input_release_device);
413 * input_open_device - open input device
414 * @handle: handle through which device is being accessed
416 * This function should be called by input handlers when they
417 * want to start receive events from given input device.
419 int input_open_device(struct input_handle *handle)
421 struct input_dev *dev = handle->dev;
424 retval = mutex_lock_interruptible(&dev->mutex);
428 if (dev->going_away) {
435 if (!dev->users++ && dev->open)
436 retval = dev->open(dev);
440 if (!--handle->open) {
442 * Make sure we are not delivering any more events
443 * through this handle
450 mutex_unlock(&dev->mutex);
453 EXPORT_SYMBOL(input_open_device);
455 int input_flush_device(struct input_handle *handle, struct file *file)
457 struct input_dev *dev = handle->dev;
460 retval = mutex_lock_interruptible(&dev->mutex);
465 retval = dev->flush(dev, file);
467 mutex_unlock(&dev->mutex);
470 EXPORT_SYMBOL(input_flush_device);
473 * input_close_device - close input device
474 * @handle: handle through which device is being accessed
476 * This function should be called by input handlers when they
477 * want to stop receive events from given input device.
479 void input_close_device(struct input_handle *handle)
481 struct input_dev *dev = handle->dev;
483 mutex_lock(&dev->mutex);
485 __input_release_device(handle);
487 if (!--dev->users && dev->close)
490 if (!--handle->open) {
492 * synchronize_rcu() makes sure that input_pass_event()
493 * completed and that no more input events are delivered
494 * through this handle
499 mutex_unlock(&dev->mutex);
501 EXPORT_SYMBOL(input_close_device);
504 * Prepare device for unregistering
506 static void input_disconnect_device(struct input_dev *dev)
508 struct input_handle *handle;
512 * Mark device as going away. Note that we take dev->mutex here
513 * not to protect access to dev->going_away but rather to ensure
514 * that there are no threads in the middle of input_open_device()
516 mutex_lock(&dev->mutex);
518 mutex_unlock(&dev->mutex);
520 spin_lock_irq(&dev->event_lock);
523 * Simulate keyup events for all pressed keys so that handlers
524 * are not left with "stuck" keys. The driver may continue
525 * generate events even after we done here but they will not
526 * reach any handlers.
528 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
529 for (code = 0; code <= KEY_MAX; code++) {
530 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
531 __test_and_clear_bit(code, dev->key)) {
532 input_pass_event(dev, EV_KEY, code, 0);
535 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
538 list_for_each_entry(handle, &dev->h_list, d_node)
541 spin_unlock_irq(&dev->event_lock);
544 static int input_fetch_keycode(struct input_dev *dev, int scancode)
546 switch (dev->keycodesize) {
548 return ((u8 *)dev->keycode)[scancode];
551 return ((u16 *)dev->keycode)[scancode];
554 return ((u32 *)dev->keycode)[scancode];
558 static int input_default_getkeycode(struct input_dev *dev,
559 int scancode, int *keycode)
561 if (!dev->keycodesize)
564 if (scancode >= dev->keycodemax)
567 *keycode = input_fetch_keycode(dev, scancode);
572 static int input_default_setkeycode(struct input_dev *dev,
573 int scancode, int keycode)
578 if (scancode >= dev->keycodemax)
581 if (!dev->keycodesize)
584 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
587 switch (dev->keycodesize) {
589 u8 *k = (u8 *)dev->keycode;
590 old_keycode = k[scancode];
591 k[scancode] = keycode;
595 u16 *k = (u16 *)dev->keycode;
596 old_keycode = k[scancode];
597 k[scancode] = keycode;
601 u32 *k = (u32 *)dev->keycode;
602 old_keycode = k[scancode];
603 k[scancode] = keycode;
608 clear_bit(old_keycode, dev->keybit);
609 set_bit(keycode, dev->keybit);
611 for (i = 0; i < dev->keycodemax; i++) {
612 if (input_fetch_keycode(dev, i) == old_keycode) {
613 set_bit(old_keycode, dev->keybit);
614 break; /* Setting the bit twice is useless, so break */
622 * input_get_keycode - retrieve keycode currently mapped to a given scancode
623 * @dev: input device which keymap is being queried
624 * @scancode: scancode (or its equivalent for device in question) for which
628 * This function should be called by anyone interested in retrieving current
629 * keymap. Presently keyboard and evdev handlers use it.
631 int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
636 return dev->getkeycode(dev, scancode, keycode);
638 EXPORT_SYMBOL(input_get_keycode);
641 * input_get_keycode - assign new keycode to a given scancode
642 * @dev: input device which keymap is being updated
643 * @scancode: scancode (or its equivalent for device in question)
644 * @keycode: new keycode to be assigned to the scancode
646 * This function should be called by anyone needing to update current
647 * keymap. Presently keyboard and evdev handlers use it.
649 int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
658 if (keycode < 0 || keycode > KEY_MAX)
661 spin_lock_irqsave(&dev->event_lock, flags);
663 retval = dev->getkeycode(dev, scancode, &old_keycode);
667 retval = dev->setkeycode(dev, scancode, keycode);
672 * Simulate keyup event if keycode is not present
673 * in the keymap anymore
675 if (test_bit(EV_KEY, dev->evbit) &&
676 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
677 __test_and_clear_bit(old_keycode, dev->key)) {
679 input_pass_event(dev, EV_KEY, old_keycode, 0);
681 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
685 spin_unlock_irqrestore(&dev->event_lock, flags);
689 EXPORT_SYMBOL(input_set_keycode);
691 #define MATCH_BIT(bit, max) \
692 for (i = 0; i < BITS_TO_LONGS(max); i++) \
693 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
695 if (i != BITS_TO_LONGS(max)) \
698 static const struct input_device_id *input_match_device(const struct input_device_id *id,
699 struct input_dev *dev)
703 for (; id->flags || id->driver_info; id++) {
705 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
706 if (id->bustype != dev->id.bustype)
709 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
710 if (id->vendor != dev->id.vendor)
713 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
714 if (id->product != dev->id.product)
717 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
718 if (id->version != dev->id.version)
721 MATCH_BIT(evbit, EV_MAX);
722 MATCH_BIT(keybit, KEY_MAX);
723 MATCH_BIT(relbit, REL_MAX);
724 MATCH_BIT(absbit, ABS_MAX);
725 MATCH_BIT(mscbit, MSC_MAX);
726 MATCH_BIT(ledbit, LED_MAX);
727 MATCH_BIT(sndbit, SND_MAX);
728 MATCH_BIT(ffbit, FF_MAX);
729 MATCH_BIT(swbit, SW_MAX);
737 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
739 const struct input_device_id *id;
742 if (handler->blacklist && input_match_device(handler->blacklist, dev))
745 id = input_match_device(handler->id_table, dev);
749 error = handler->connect(handler, dev, id);
750 if (error && error != -ENODEV)
752 "input: failed to attach handler %s to device %s, "
754 handler->name, kobject_name(&dev->dev.kobj), error);
760 #ifdef CONFIG_PROC_FS
762 static struct proc_dir_entry *proc_bus_input_dir;
763 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
764 static int input_devices_state;
766 static inline void input_wakeup_procfs_readers(void)
768 input_devices_state++;
769 wake_up(&input_devices_poll_wait);
772 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
774 poll_wait(file, &input_devices_poll_wait, wait);
775 if (file->f_version != input_devices_state) {
776 file->f_version = input_devices_state;
777 return POLLIN | POLLRDNORM;
783 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
785 if (mutex_lock_interruptible(&input_mutex))
788 return seq_list_start(&input_dev_list, *pos);
791 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
793 return seq_list_next(v, &input_dev_list, pos);
796 static void input_devices_seq_stop(struct seq_file *seq, void *v)
798 mutex_unlock(&input_mutex);
801 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
802 unsigned long *bitmap, int max)
806 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
810 seq_printf(seq, "B: %s=", name);
812 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
816 static int input_devices_seq_show(struct seq_file *seq, void *v)
818 struct input_dev *dev = container_of(v, struct input_dev, node);
819 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
820 struct input_handle *handle;
822 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
823 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
825 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
826 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
827 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
828 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
829 seq_printf(seq, "H: Handlers=");
831 list_for_each_entry(handle, &dev->h_list, d_node)
832 seq_printf(seq, "%s ", handle->name);
835 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
836 if (test_bit(EV_KEY, dev->evbit))
837 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
838 if (test_bit(EV_REL, dev->evbit))
839 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
840 if (test_bit(EV_ABS, dev->evbit))
841 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
842 if (test_bit(EV_MSC, dev->evbit))
843 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
844 if (test_bit(EV_LED, dev->evbit))
845 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
846 if (test_bit(EV_SND, dev->evbit))
847 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
848 if (test_bit(EV_FF, dev->evbit))
849 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
850 if (test_bit(EV_SW, dev->evbit))
851 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
859 static const struct seq_operations input_devices_seq_ops = {
860 .start = input_devices_seq_start,
861 .next = input_devices_seq_next,
862 .stop = input_devices_seq_stop,
863 .show = input_devices_seq_show,
866 static int input_proc_devices_open(struct inode *inode, struct file *file)
868 return seq_open(file, &input_devices_seq_ops);
871 static const struct file_operations input_devices_fileops = {
872 .owner = THIS_MODULE,
873 .open = input_proc_devices_open,
874 .poll = input_proc_devices_poll,
877 .release = seq_release,
880 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
882 if (mutex_lock_interruptible(&input_mutex))
885 seq->private = (void *)(unsigned long)*pos;
886 return seq_list_start(&input_handler_list, *pos);
889 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
891 seq->private = (void *)(unsigned long)(*pos + 1);
892 return seq_list_next(v, &input_handler_list, pos);
895 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
897 mutex_unlock(&input_mutex);
900 static int input_handlers_seq_show(struct seq_file *seq, void *v)
902 struct input_handler *handler = container_of(v, struct input_handler, node);
904 seq_printf(seq, "N: Number=%ld Name=%s",
905 (unsigned long)seq->private, handler->name);
907 seq_printf(seq, " Minor=%d", handler->minor);
912 static const struct seq_operations input_handlers_seq_ops = {
913 .start = input_handlers_seq_start,
914 .next = input_handlers_seq_next,
915 .stop = input_handlers_seq_stop,
916 .show = input_handlers_seq_show,
919 static int input_proc_handlers_open(struct inode *inode, struct file *file)
921 return seq_open(file, &input_handlers_seq_ops);
924 static const struct file_operations input_handlers_fileops = {
925 .owner = THIS_MODULE,
926 .open = input_proc_handlers_open,
929 .release = seq_release,
932 static int __init input_proc_init(void)
934 struct proc_dir_entry *entry;
936 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
937 if (!proc_bus_input_dir)
940 entry = proc_create("devices", 0, proc_bus_input_dir,
941 &input_devices_fileops);
945 entry = proc_create("handlers", 0, proc_bus_input_dir,
946 &input_handlers_fileops);
952 fail2: remove_proc_entry("devices", proc_bus_input_dir);
953 fail1: remove_proc_entry("bus/input", NULL);
957 static void input_proc_exit(void)
959 remove_proc_entry("devices", proc_bus_input_dir);
960 remove_proc_entry("handlers", proc_bus_input_dir);
961 remove_proc_entry("bus/input", NULL);
964 #else /* !CONFIG_PROC_FS */
965 static inline void input_wakeup_procfs_readers(void) { }
966 static inline int input_proc_init(void) { return 0; }
967 static inline void input_proc_exit(void) { }
970 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
971 static ssize_t input_dev_show_##name(struct device *dev, \
972 struct device_attribute *attr, \
975 struct input_dev *input_dev = to_input_dev(dev); \
977 return scnprintf(buf, PAGE_SIZE, "%s\n", \
978 input_dev->name ? input_dev->name : ""); \
980 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
982 INPUT_DEV_STRING_ATTR_SHOW(name);
983 INPUT_DEV_STRING_ATTR_SHOW(phys);
984 INPUT_DEV_STRING_ATTR_SHOW(uniq);
986 static int input_print_modalias_bits(char *buf, int size,
987 char name, unsigned long *bm,
988 unsigned int min_bit, unsigned int max_bit)
992 len += snprintf(buf, max(size, 0), "%c", name);
993 for (i = min_bit; i < max_bit; i++)
994 if (bm[BIT_WORD(i)] & BIT_MASK(i))
995 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
999 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1004 len = snprintf(buf, max(size, 0),
1005 "input:b%04Xv%04Xp%04Xe%04X-",
1006 id->id.bustype, id->id.vendor,
1007 id->id.product, id->id.version);
1009 len += input_print_modalias_bits(buf + len, size - len,
1010 'e', id->evbit, 0, EV_MAX);
1011 len += input_print_modalias_bits(buf + len, size - len,
1012 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1013 len += input_print_modalias_bits(buf + len, size - len,
1014 'r', id->relbit, 0, REL_MAX);
1015 len += input_print_modalias_bits(buf + len, size - len,
1016 'a', id->absbit, 0, ABS_MAX);
1017 len += input_print_modalias_bits(buf + len, size - len,
1018 'm', id->mscbit, 0, MSC_MAX);
1019 len += input_print_modalias_bits(buf + len, size - len,
1020 'l', id->ledbit, 0, LED_MAX);
1021 len += input_print_modalias_bits(buf + len, size - len,
1022 's', id->sndbit, 0, SND_MAX);
1023 len += input_print_modalias_bits(buf + len, size - len,
1024 'f', id->ffbit, 0, FF_MAX);
1025 len += input_print_modalias_bits(buf + len, size - len,
1026 'w', id->swbit, 0, SW_MAX);
1029 len += snprintf(buf + len, max(size - len, 0), "\n");
1034 static ssize_t input_dev_show_modalias(struct device *dev,
1035 struct device_attribute *attr,
1038 struct input_dev *id = to_input_dev(dev);
1041 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1043 return min_t(int, len, PAGE_SIZE);
1045 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1047 static struct attribute *input_dev_attrs[] = {
1048 &dev_attr_name.attr,
1049 &dev_attr_phys.attr,
1050 &dev_attr_uniq.attr,
1051 &dev_attr_modalias.attr,
1055 static struct attribute_group input_dev_attr_group = {
1056 .attrs = input_dev_attrs,
1059 #define INPUT_DEV_ID_ATTR(name) \
1060 static ssize_t input_dev_show_id_##name(struct device *dev, \
1061 struct device_attribute *attr, \
1064 struct input_dev *input_dev = to_input_dev(dev); \
1065 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1067 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1069 INPUT_DEV_ID_ATTR(bustype);
1070 INPUT_DEV_ID_ATTR(vendor);
1071 INPUT_DEV_ID_ATTR(product);
1072 INPUT_DEV_ID_ATTR(version);
1074 static struct attribute *input_dev_id_attrs[] = {
1075 &dev_attr_bustype.attr,
1076 &dev_attr_vendor.attr,
1077 &dev_attr_product.attr,
1078 &dev_attr_version.attr,
1082 static struct attribute_group input_dev_id_attr_group = {
1084 .attrs = input_dev_id_attrs,
1087 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1088 int max, int add_cr)
1093 for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
1098 len += snprintf(buf + len, max(buf_size - len, 0),
1099 "%lx%s", bitmap[i], i > 0 ? " " : "");
1102 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1107 #define INPUT_DEV_CAP_ATTR(ev, bm) \
1108 static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1109 struct device_attribute *attr, \
1112 struct input_dev *input_dev = to_input_dev(dev); \
1113 int len = input_print_bitmap(buf, PAGE_SIZE, \
1114 input_dev->bm##bit, ev##_MAX, 1); \
1115 return min_t(int, len, PAGE_SIZE); \
1117 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1119 INPUT_DEV_CAP_ATTR(EV, ev);
1120 INPUT_DEV_CAP_ATTR(KEY, key);
1121 INPUT_DEV_CAP_ATTR(REL, rel);
1122 INPUT_DEV_CAP_ATTR(ABS, abs);
1123 INPUT_DEV_CAP_ATTR(MSC, msc);
1124 INPUT_DEV_CAP_ATTR(LED, led);
1125 INPUT_DEV_CAP_ATTR(SND, snd);
1126 INPUT_DEV_CAP_ATTR(FF, ff);
1127 INPUT_DEV_CAP_ATTR(SW, sw);
1129 static struct attribute *input_dev_caps_attrs[] = {
1142 static struct attribute_group input_dev_caps_attr_group = {
1143 .name = "capabilities",
1144 .attrs = input_dev_caps_attrs,
1147 static struct attribute_group *input_dev_attr_groups[] = {
1148 &input_dev_attr_group,
1149 &input_dev_id_attr_group,
1150 &input_dev_caps_attr_group,
1154 static void input_dev_release(struct device *device)
1156 struct input_dev *dev = to_input_dev(device);
1158 input_ff_destroy(dev);
1161 module_put(THIS_MODULE);
1165 * Input uevent interface - loading event handlers based on
1168 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1169 const char *name, unsigned long *bitmap, int max)
1173 if (add_uevent_var(env, "%s=", name))
1176 len = input_print_bitmap(&env->buf[env->buflen - 1],
1177 sizeof(env->buf) - env->buflen,
1179 if (len >= (sizeof(env->buf) - env->buflen))
1186 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1187 struct input_dev *dev)
1191 if (add_uevent_var(env, "MODALIAS="))
1194 len = input_print_modalias(&env->buf[env->buflen - 1],
1195 sizeof(env->buf) - env->buflen,
1197 if (len >= (sizeof(env->buf) - env->buflen))
1204 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1206 int err = add_uevent_var(env, fmt, val); \
1211 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1213 int err = input_add_uevent_bm_var(env, name, bm, max); \
1218 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1220 int err = input_add_uevent_modalias_var(env, dev); \
1225 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1227 struct input_dev *dev = to_input_dev(device);
1229 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1230 dev->id.bustype, dev->id.vendor,
1231 dev->id.product, dev->id.version);
1233 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1235 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1237 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1239 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1240 if (test_bit(EV_KEY, dev->evbit))
1241 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1242 if (test_bit(EV_REL, dev->evbit))
1243 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1244 if (test_bit(EV_ABS, dev->evbit))
1245 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1246 if (test_bit(EV_MSC, dev->evbit))
1247 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1248 if (test_bit(EV_LED, dev->evbit))
1249 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1250 if (test_bit(EV_SND, dev->evbit))
1251 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1252 if (test_bit(EV_FF, dev->evbit))
1253 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1254 if (test_bit(EV_SW, dev->evbit))
1255 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1257 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1262 static struct device_type input_dev_type = {
1263 .groups = input_dev_attr_groups,
1264 .release = input_dev_release,
1265 .uevent = input_dev_uevent,
1268 static char *input_nodename(struct device *dev)
1270 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1273 struct class input_class = {
1275 .nodename = input_nodename,
1277 EXPORT_SYMBOL_GPL(input_class);
1280 * input_allocate_device - allocate memory for new input device
1282 * Returns prepared struct input_dev or NULL.
1284 * NOTE: Use input_free_device() to free devices that have not been
1285 * registered; input_unregister_device() should be used for already
1286 * registered devices.
1288 struct input_dev *input_allocate_device(void)
1290 struct input_dev *dev;
1292 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1294 dev->dev.type = &input_dev_type;
1295 dev->dev.class = &input_class;
1296 device_initialize(&dev->dev);
1297 mutex_init(&dev->mutex);
1298 spin_lock_init(&dev->event_lock);
1299 INIT_LIST_HEAD(&dev->h_list);
1300 INIT_LIST_HEAD(&dev->node);
1302 __module_get(THIS_MODULE);
1307 EXPORT_SYMBOL(input_allocate_device);
1310 * input_free_device - free memory occupied by input_dev structure
1311 * @dev: input device to free
1313 * This function should only be used if input_register_device()
1314 * was not called yet or if it failed. Once device was registered
1315 * use input_unregister_device() and memory will be freed once last
1316 * reference to the device is dropped.
1318 * Device should be allocated by input_allocate_device().
1320 * NOTE: If there are references to the input device then memory
1321 * will not be freed until last reference is dropped.
1323 void input_free_device(struct input_dev *dev)
1326 input_put_device(dev);
1328 EXPORT_SYMBOL(input_free_device);
1331 * input_set_capability - mark device as capable of a certain event
1332 * @dev: device that is capable of emitting or accepting event
1333 * @type: type of the event (EV_KEY, EV_REL, etc...)
1336 * In addition to setting up corresponding bit in appropriate capability
1337 * bitmap the function also adjusts dev->evbit.
1339 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1343 __set_bit(code, dev->keybit);
1347 __set_bit(code, dev->relbit);
1351 __set_bit(code, dev->absbit);
1355 __set_bit(code, dev->mscbit);
1359 __set_bit(code, dev->swbit);
1363 __set_bit(code, dev->ledbit);
1367 __set_bit(code, dev->sndbit);
1371 __set_bit(code, dev->ffbit);
1380 "input_set_capability: unknown type %u (code %u)\n",
1386 __set_bit(type, dev->evbit);
1388 EXPORT_SYMBOL(input_set_capability);
1391 * input_register_device - register device with input core
1392 * @dev: device to be registered
1394 * This function registers device with input core. The device must be
1395 * allocated with input_allocate_device() and all it's capabilities
1396 * set up before registering.
1397 * If function fails the device must be freed with input_free_device().
1398 * Once device has been successfully registered it can be unregistered
1399 * with input_unregister_device(); input_free_device() should not be
1400 * called in this case.
1402 int input_register_device(struct input_dev *dev)
1404 static atomic_t input_no = ATOMIC_INIT(0);
1405 struct input_handler *handler;
1409 __set_bit(EV_SYN, dev->evbit);
1412 * If delay and period are pre-set by the driver, then autorepeating
1413 * is handled by the driver itself and we don't do it in input.c.
1416 init_timer(&dev->timer);
1417 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1418 dev->timer.data = (long) dev;
1419 dev->timer.function = input_repeat_key;
1420 dev->rep[REP_DELAY] = 250;
1421 dev->rep[REP_PERIOD] = 33;
1424 if (!dev->getkeycode)
1425 dev->getkeycode = input_default_getkeycode;
1427 if (!dev->setkeycode)
1428 dev->setkeycode = input_default_setkeycode;
1430 dev_set_name(&dev->dev, "input%ld",
1431 (unsigned long) atomic_inc_return(&input_no) - 1);
1433 error = device_add(&dev->dev);
1437 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1438 printk(KERN_INFO "input: %s as %s\n",
1439 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1442 error = mutex_lock_interruptible(&input_mutex);
1444 device_del(&dev->dev);
1448 list_add_tail(&dev->node, &input_dev_list);
1450 list_for_each_entry(handler, &input_handler_list, node)
1451 input_attach_handler(dev, handler);
1453 input_wakeup_procfs_readers();
1455 mutex_unlock(&input_mutex);
1459 EXPORT_SYMBOL(input_register_device);
1462 * input_unregister_device - unregister previously registered device
1463 * @dev: device to be unregistered
1465 * This function unregisters an input device. Once device is unregistered
1466 * the caller should not try to access it as it may get freed at any moment.
1468 void input_unregister_device(struct input_dev *dev)
1470 struct input_handle *handle, *next;
1472 input_disconnect_device(dev);
1474 mutex_lock(&input_mutex);
1476 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1477 handle->handler->disconnect(handle);
1478 WARN_ON(!list_empty(&dev->h_list));
1480 del_timer_sync(&dev->timer);
1481 list_del_init(&dev->node);
1483 input_wakeup_procfs_readers();
1485 mutex_unlock(&input_mutex);
1487 device_unregister(&dev->dev);
1489 EXPORT_SYMBOL(input_unregister_device);
1492 * input_register_handler - register a new input handler
1493 * @handler: handler to be registered
1495 * This function registers a new input handler (interface) for input
1496 * devices in the system and attaches it to all input devices that
1497 * are compatible with the handler.
1499 int input_register_handler(struct input_handler *handler)
1501 struct input_dev *dev;
1504 retval = mutex_lock_interruptible(&input_mutex);
1508 INIT_LIST_HEAD(&handler->h_list);
1510 if (handler->fops != NULL) {
1511 if (input_table[handler->minor >> 5]) {
1515 input_table[handler->minor >> 5] = handler;
1518 list_add_tail(&handler->node, &input_handler_list);
1520 list_for_each_entry(dev, &input_dev_list, node)
1521 input_attach_handler(dev, handler);
1523 input_wakeup_procfs_readers();
1526 mutex_unlock(&input_mutex);
1529 EXPORT_SYMBOL(input_register_handler);
1532 * input_unregister_handler - unregisters an input handler
1533 * @handler: handler to be unregistered
1535 * This function disconnects a handler from its input devices and
1536 * removes it from lists of known handlers.
1538 void input_unregister_handler(struct input_handler *handler)
1540 struct input_handle *handle, *next;
1542 mutex_lock(&input_mutex);
1544 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1545 handler->disconnect(handle);
1546 WARN_ON(!list_empty(&handler->h_list));
1548 list_del_init(&handler->node);
1550 if (handler->fops != NULL)
1551 input_table[handler->minor >> 5] = NULL;
1553 input_wakeup_procfs_readers();
1555 mutex_unlock(&input_mutex);
1557 EXPORT_SYMBOL(input_unregister_handler);
1560 * input_register_handle - register a new input handle
1561 * @handle: handle to register
1563 * This function puts a new input handle onto device's
1564 * and handler's lists so that events can flow through
1565 * it once it is opened using input_open_device().
1567 * This function is supposed to be called from handler's
1570 int input_register_handle(struct input_handle *handle)
1572 struct input_handler *handler = handle->handler;
1573 struct input_dev *dev = handle->dev;
1577 * We take dev->mutex here to prevent race with
1578 * input_release_device().
1580 error = mutex_lock_interruptible(&dev->mutex);
1583 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1584 mutex_unlock(&dev->mutex);
1587 * Since we are supposed to be called from ->connect()
1588 * which is mutually exclusive with ->disconnect()
1589 * we can't be racing with input_unregister_handle()
1590 * and so separate lock is not needed here.
1592 list_add_tail(&handle->h_node, &handler->h_list);
1595 handler->start(handle);
1599 EXPORT_SYMBOL(input_register_handle);
1602 * input_unregister_handle - unregister an input handle
1603 * @handle: handle to unregister
1605 * This function removes input handle from device's
1606 * and handler's lists.
1608 * This function is supposed to be called from handler's
1609 * disconnect() method.
1611 void input_unregister_handle(struct input_handle *handle)
1613 struct input_dev *dev = handle->dev;
1615 list_del_init(&handle->h_node);
1618 * Take dev->mutex to prevent race with input_release_device().
1620 mutex_lock(&dev->mutex);
1621 list_del_rcu(&handle->d_node);
1622 mutex_unlock(&dev->mutex);
1625 EXPORT_SYMBOL(input_unregister_handle);
1627 static int input_open_file(struct inode *inode, struct file *file)
1629 struct input_handler *handler;
1630 const struct file_operations *old_fops, *new_fops = NULL;
1634 /* No load-on-demand here? */
1635 handler = input_table[iminor(inode) >> 5];
1636 if (!handler || !(new_fops = fops_get(handler->fops))) {
1642 * That's _really_ odd. Usually NULL ->open means "nothing special",
1643 * not "no device". Oh, well...
1645 if (!new_fops->open) {
1650 old_fops = file->f_op;
1651 file->f_op = new_fops;
1653 err = new_fops->open(inode, file);
1656 fops_put(file->f_op);
1657 file->f_op = fops_get(old_fops);
1665 static const struct file_operations input_fops = {
1666 .owner = THIS_MODULE,
1667 .open = input_open_file,
1670 static void __init input_init_abs_bypass(void)
1672 const unsigned int *p;
1674 for (p = input_abs_bypass_init_data; *p; p++)
1675 input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
1678 static int __init input_init(void)
1682 input_init_abs_bypass();
1684 err = class_register(&input_class);
1686 printk(KERN_ERR "input: unable to register input_dev class\n");
1690 err = input_proc_init();
1694 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1696 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1702 fail2: input_proc_exit();
1703 fail1: class_unregister(&input_class);
1707 static void __exit input_exit(void)
1710 unregister_chrdev(INPUT_MAJOR, "input");
1711 class_unregister(&input_class);
1714 subsys_initcall(input_init);
1715 module_exit(input_exit);