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/smp_lock.h>
15 #include <linux/input.h>
16 #include <linux/module.h>
17 #include <linux/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/interrupt.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
30 #define INPUT_DEVICES 256
32 static LIST_HEAD(input_dev_list);
33 static LIST_HEAD(input_handler_list);
35 static struct input_handler *input_table[8];
38 * input_event() - report new input event
39 * @dev: device that generated the event
40 * @type: type of the event
42 * @value: value of the event
44 * This function should be used by drivers implementing various input devices
45 * See also input_inject_event()
47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
49 struct input_handle *handle;
51 if (type > EV_MAX || !test_bit(type, dev->evbit))
54 add_input_randomness(type, code, value);
62 dev->event(dev, type, code, value);
75 if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
81 change_bit(code, dev->key);
83 if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
84 dev->repeat_key = code;
85 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
92 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
95 change_bit(code, dev->sw);
101 if (code > ABS_MAX || !test_bit(code, dev->absbit))
104 if (dev->absfuzz[code]) {
105 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
106 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
109 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
110 (value < dev->abs[code] + dev->absfuzz[code]))
111 value = (dev->abs[code] * 3 + value) >> 2;
113 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
114 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
115 value = (dev->abs[code] + value) >> 1;
118 if (dev->abs[code] == value)
121 dev->abs[code] = value;
126 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
133 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
137 dev->event(dev, type, code, value);
143 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
146 change_bit(code, dev->led);
149 dev->event(dev, type, code, value);
155 if (code > SND_MAX || !test_bit(code, dev->sndbit))
158 if (!!test_bit(code, dev->snd) != !!value)
159 change_bit(code, dev->snd);
162 dev->event(dev, type, code, value);
168 if (code > REP_MAX || value < 0 || dev->rep[code] == value)
171 dev->rep[code] = value;
173 dev->event(dev, type, code, value);
183 dev->event(dev, type, code, value);
191 dev->grab->handler->event(dev->grab, type, code, value);
193 list_for_each_entry(handle, &dev->h_list, d_node)
195 handle->handler->event(handle, type, code, value);
197 EXPORT_SYMBOL(input_event);
200 * input_inject_event() - send input event from input handler
201 * @handle: input handle to send event through
202 * @type: type of the event
204 * @value: value of the event
206 * Similar to input_event() but will ignore event if device is "grabbed" and handle
207 * injecting event is not the one that owns the device.
209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
211 if (!handle->dev->grab || handle->dev->grab == handle)
212 input_event(handle->dev, type, code, value);
214 EXPORT_SYMBOL(input_inject_event);
216 static void input_repeat_key(unsigned long data)
218 struct input_dev *dev = (void *) data;
220 if (!test_bit(dev->repeat_key, dev->key))
223 input_event(dev, EV_KEY, dev->repeat_key, 2);
226 if (dev->rep[REP_PERIOD])
227 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
230 int input_grab_device(struct input_handle *handle)
232 if (handle->dev->grab)
235 handle->dev->grab = handle;
238 EXPORT_SYMBOL(input_grab_device);
240 void input_release_device(struct input_handle *handle)
242 struct input_dev *dev = handle->dev;
244 if (dev->grab == handle) {
247 list_for_each_entry(handle, &dev->h_list, d_node)
248 if (handle->handler->start)
249 handle->handler->start(handle);
252 EXPORT_SYMBOL(input_release_device);
254 int input_open_device(struct input_handle *handle)
256 struct input_dev *dev = handle->dev;
259 err = mutex_lock_interruptible(&dev->mutex);
265 if (!dev->users++ && dev->open)
266 err = dev->open(dev);
271 mutex_unlock(&dev->mutex);
275 EXPORT_SYMBOL(input_open_device);
277 int input_flush_device(struct input_handle* handle, struct file* file)
279 if (handle->dev->flush)
280 return handle->dev->flush(handle->dev, file);
284 EXPORT_SYMBOL(input_flush_device);
286 void input_close_device(struct input_handle *handle)
288 struct input_dev *dev = handle->dev;
290 input_release_device(handle);
292 mutex_lock(&dev->mutex);
294 if (!--dev->users && dev->close)
298 mutex_unlock(&dev->mutex);
300 EXPORT_SYMBOL(input_close_device);
302 static int input_fetch_keycode(struct input_dev *dev, int scancode)
304 switch (dev->keycodesize) {
306 return ((u8 *)dev->keycode)[scancode];
309 return ((u16 *)dev->keycode)[scancode];
312 return ((u32 *)dev->keycode)[scancode];
316 static int input_default_getkeycode(struct input_dev *dev,
317 int scancode, int *keycode)
319 if (!dev->keycodesize)
322 if (scancode < 0 || scancode >= dev->keycodemax)
325 *keycode = input_fetch_keycode(dev, scancode);
330 static int input_default_setkeycode(struct input_dev *dev,
331 int scancode, int keycode)
336 if (scancode < 0 || scancode >= dev->keycodemax)
339 if (keycode < 0 || keycode > KEY_MAX)
342 if (!dev->keycodesize)
345 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
348 switch (dev->keycodesize) {
350 u8 *k = (u8 *)dev->keycode;
351 old_keycode = k[scancode];
352 k[scancode] = keycode;
356 u16 *k = (u16 *)dev->keycode;
357 old_keycode = k[scancode];
358 k[scancode] = keycode;
362 u32 *k = (u32 *)dev->keycode;
363 old_keycode = k[scancode];
364 k[scancode] = keycode;
369 clear_bit(old_keycode, dev->keybit);
370 set_bit(keycode, dev->keybit);
372 for (i = 0; i < dev->keycodemax; i++) {
373 if (input_fetch_keycode(dev, i) == old_keycode) {
374 set_bit(old_keycode, dev->keybit);
375 break; /* Setting the bit twice is useless, so break */
383 static void input_link_handle(struct input_handle *handle)
385 list_add_tail(&handle->d_node, &handle->dev->h_list);
386 list_add_tail(&handle->h_node, &handle->handler->h_list);
389 #define MATCH_BIT(bit, max) \
390 for (i = 0; i < NBITS(max); i++) \
391 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
393 if (i != NBITS(max)) \
396 static const struct input_device_id *input_match_device(const struct input_device_id *id,
397 struct input_dev *dev)
401 for (; id->flags || id->driver_info; id++) {
403 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
404 if (id->bustype != dev->id.bustype)
407 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
408 if (id->vendor != dev->id.vendor)
411 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
412 if (id->product != dev->id.product)
415 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
416 if (id->version != dev->id.version)
419 MATCH_BIT(evbit, EV_MAX);
420 MATCH_BIT(keybit, KEY_MAX);
421 MATCH_BIT(relbit, REL_MAX);
422 MATCH_BIT(absbit, ABS_MAX);
423 MATCH_BIT(mscbit, MSC_MAX);
424 MATCH_BIT(ledbit, LED_MAX);
425 MATCH_BIT(sndbit, SND_MAX);
426 MATCH_BIT(ffbit, FF_MAX);
427 MATCH_BIT(swbit, SW_MAX);
435 #ifdef CONFIG_PROC_FS
437 static struct proc_dir_entry *proc_bus_input_dir;
438 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
439 static int input_devices_state;
441 static inline void input_wakeup_procfs_readers(void)
443 input_devices_state++;
444 wake_up(&input_devices_poll_wait);
447 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
449 int state = input_devices_state;
451 poll_wait(file, &input_devices_poll_wait, wait);
452 if (state != input_devices_state)
453 return POLLIN | POLLRDNORM;
458 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
460 struct list_head *node;
463 list_for_each(node, list)
470 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
472 if (element->next == list)
476 return element->next;
479 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
481 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
483 return list_get_nth_element(&input_dev_list, pos);
486 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
488 return list_get_next_element(&input_dev_list, v, pos);
491 static void input_devices_seq_stop(struct seq_file *seq, void *v)
493 /* release lock here */
496 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
497 unsigned long *bitmap, int max)
501 for (i = NBITS(max) - 1; i > 0; i--)
505 seq_printf(seq, "B: %s=", name);
507 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
511 static int input_devices_seq_show(struct seq_file *seq, void *v)
513 struct input_dev *dev = container_of(v, struct input_dev, node);
514 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
515 struct input_handle *handle;
517 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
518 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
520 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
521 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
522 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
523 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
524 seq_printf(seq, "H: Handlers=");
526 list_for_each_entry(handle, &dev->h_list, d_node)
527 seq_printf(seq, "%s ", handle->name);
530 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
531 if (test_bit(EV_KEY, dev->evbit))
532 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
533 if (test_bit(EV_REL, dev->evbit))
534 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
535 if (test_bit(EV_ABS, dev->evbit))
536 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
537 if (test_bit(EV_MSC, dev->evbit))
538 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
539 if (test_bit(EV_LED, dev->evbit))
540 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
541 if (test_bit(EV_SND, dev->evbit))
542 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
543 if (test_bit(EV_FF, dev->evbit))
544 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
545 if (test_bit(EV_SW, dev->evbit))
546 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
554 static struct seq_operations input_devices_seq_ops = {
555 .start = input_devices_seq_start,
556 .next = input_devices_seq_next,
557 .stop = input_devices_seq_stop,
558 .show = input_devices_seq_show,
561 static int input_proc_devices_open(struct inode *inode, struct file *file)
563 return seq_open(file, &input_devices_seq_ops);
566 static const struct file_operations input_devices_fileops = {
567 .owner = THIS_MODULE,
568 .open = input_proc_devices_open,
569 .poll = input_proc_devices_poll,
572 .release = seq_release,
575 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
577 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
578 seq->private = (void *)(unsigned long)*pos;
579 return list_get_nth_element(&input_handler_list, pos);
582 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
584 seq->private = (void *)(unsigned long)(*pos + 1);
585 return list_get_next_element(&input_handler_list, v, pos);
588 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
590 /* release lock here */
593 static int input_handlers_seq_show(struct seq_file *seq, void *v)
595 struct input_handler *handler = container_of(v, struct input_handler, node);
597 seq_printf(seq, "N: Number=%ld Name=%s",
598 (unsigned long)seq->private, handler->name);
600 seq_printf(seq, " Minor=%d", handler->minor);
605 static struct seq_operations input_handlers_seq_ops = {
606 .start = input_handlers_seq_start,
607 .next = input_handlers_seq_next,
608 .stop = input_handlers_seq_stop,
609 .show = input_handlers_seq_show,
612 static int input_proc_handlers_open(struct inode *inode, struct file *file)
614 return seq_open(file, &input_handlers_seq_ops);
617 static const struct file_operations input_handlers_fileops = {
618 .owner = THIS_MODULE,
619 .open = input_proc_handlers_open,
622 .release = seq_release,
625 static int __init input_proc_init(void)
627 struct proc_dir_entry *entry;
629 proc_bus_input_dir = proc_mkdir("input", proc_bus);
630 if (!proc_bus_input_dir)
633 proc_bus_input_dir->owner = THIS_MODULE;
635 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
639 entry->owner = THIS_MODULE;
640 entry->proc_fops = &input_devices_fileops;
642 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
646 entry->owner = THIS_MODULE;
647 entry->proc_fops = &input_handlers_fileops;
651 fail2: remove_proc_entry("devices", proc_bus_input_dir);
652 fail1: remove_proc_entry("input", proc_bus);
656 static void input_proc_exit(void)
658 remove_proc_entry("devices", proc_bus_input_dir);
659 remove_proc_entry("handlers", proc_bus_input_dir);
660 remove_proc_entry("input", proc_bus);
663 #else /* !CONFIG_PROC_FS */
664 static inline void input_wakeup_procfs_readers(void) { }
665 static inline int input_proc_init(void) { return 0; }
666 static inline void input_proc_exit(void) { }
669 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
670 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
672 struct input_dev *input_dev = to_input_dev(dev); \
674 return scnprintf(buf, PAGE_SIZE, "%s\n", \
675 input_dev->name ? input_dev->name : ""); \
677 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
679 INPUT_DEV_STRING_ATTR_SHOW(name);
680 INPUT_DEV_STRING_ATTR_SHOW(phys);
681 INPUT_DEV_STRING_ATTR_SHOW(uniq);
683 static int input_print_modalias_bits(char *buf, int size,
684 char name, unsigned long *bm,
685 unsigned int min_bit, unsigned int max_bit)
689 len += snprintf(buf, max(size, 0), "%c", name);
690 for (i = min_bit; i < max_bit; i++)
691 if (bm[LONG(i)] & BIT(i))
692 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
696 static int input_print_modalias(char *buf, int size, struct input_dev *id,
701 len = snprintf(buf, max(size, 0),
702 "input:b%04Xv%04Xp%04Xe%04X-",
703 id->id.bustype, id->id.vendor,
704 id->id.product, id->id.version);
706 len += input_print_modalias_bits(buf + len, size - len,
707 'e', id->evbit, 0, EV_MAX);
708 len += input_print_modalias_bits(buf + len, size - len,
709 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
710 len += input_print_modalias_bits(buf + len, size - len,
711 'r', id->relbit, 0, REL_MAX);
712 len += input_print_modalias_bits(buf + len, size - len,
713 'a', id->absbit, 0, ABS_MAX);
714 len += input_print_modalias_bits(buf + len, size - len,
715 'm', id->mscbit, 0, MSC_MAX);
716 len += input_print_modalias_bits(buf + len, size - len,
717 'l', id->ledbit, 0, LED_MAX);
718 len += input_print_modalias_bits(buf + len, size - len,
719 's', id->sndbit, 0, SND_MAX);
720 len += input_print_modalias_bits(buf + len, size - len,
721 'f', id->ffbit, 0, FF_MAX);
722 len += input_print_modalias_bits(buf + len, size - len,
723 'w', id->swbit, 0, SW_MAX);
726 len += snprintf(buf + len, max(size - len, 0), "\n");
731 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
733 struct input_dev *id = to_input_dev(dev);
736 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
738 return min_t(int, len, PAGE_SIZE);
740 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
742 static struct attribute *input_dev_attrs[] = {
743 &class_device_attr_name.attr,
744 &class_device_attr_phys.attr,
745 &class_device_attr_uniq.attr,
746 &class_device_attr_modalias.attr,
750 static struct attribute_group input_dev_attr_group = {
751 .attrs = input_dev_attrs,
754 #define INPUT_DEV_ID_ATTR(name) \
755 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
757 struct input_dev *input_dev = to_input_dev(dev); \
758 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
760 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
762 INPUT_DEV_ID_ATTR(bustype);
763 INPUT_DEV_ID_ATTR(vendor);
764 INPUT_DEV_ID_ATTR(product);
765 INPUT_DEV_ID_ATTR(version);
767 static struct attribute *input_dev_id_attrs[] = {
768 &class_device_attr_bustype.attr,
769 &class_device_attr_vendor.attr,
770 &class_device_attr_product.attr,
771 &class_device_attr_version.attr,
775 static struct attribute_group input_dev_id_attr_group = {
777 .attrs = input_dev_id_attrs,
780 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
786 for (i = NBITS(max) - 1; i > 0; i--)
791 len += snprintf(buf + len, max(buf_size - len, 0),
792 "%lx%s", bitmap[i], i > 0 ? " " : "");
795 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
800 #define INPUT_DEV_CAP_ATTR(ev, bm) \
801 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
803 struct input_dev *input_dev = to_input_dev(dev); \
804 int len = input_print_bitmap(buf, PAGE_SIZE, \
805 input_dev->bm##bit, ev##_MAX, 1); \
806 return min_t(int, len, PAGE_SIZE); \
808 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
810 INPUT_DEV_CAP_ATTR(EV, ev);
811 INPUT_DEV_CAP_ATTR(KEY, key);
812 INPUT_DEV_CAP_ATTR(REL, rel);
813 INPUT_DEV_CAP_ATTR(ABS, abs);
814 INPUT_DEV_CAP_ATTR(MSC, msc);
815 INPUT_DEV_CAP_ATTR(LED, led);
816 INPUT_DEV_CAP_ATTR(SND, snd);
817 INPUT_DEV_CAP_ATTR(FF, ff);
818 INPUT_DEV_CAP_ATTR(SW, sw);
820 static struct attribute *input_dev_caps_attrs[] = {
821 &class_device_attr_ev.attr,
822 &class_device_attr_key.attr,
823 &class_device_attr_rel.attr,
824 &class_device_attr_abs.attr,
825 &class_device_attr_msc.attr,
826 &class_device_attr_led.attr,
827 &class_device_attr_snd.attr,
828 &class_device_attr_ff.attr,
829 &class_device_attr_sw.attr,
833 static struct attribute_group input_dev_caps_attr_group = {
834 .name = "capabilities",
835 .attrs = input_dev_caps_attrs,
838 static struct attribute_group *input_dev_attr_groups[] = {
839 &input_dev_attr_group,
840 &input_dev_id_attr_group,
841 &input_dev_caps_attr_group,
845 static void input_dev_release(struct class_device *class_dev)
847 struct input_dev *dev = to_input_dev(class_dev);
849 input_ff_destroy(dev);
852 module_put(THIS_MODULE);
856 * Input uevent interface - loading event handlers based on
859 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
860 char *buffer, int buffer_size, int *cur_len,
861 const char *name, unsigned long *bitmap, int max)
863 if (*cur_index >= num_envp - 1)
866 envp[*cur_index] = buffer + *cur_len;
868 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
869 if (*cur_len >= buffer_size)
872 *cur_len += input_print_bitmap(buffer + *cur_len,
873 max(buffer_size - *cur_len, 0),
875 if (*cur_len > buffer_size)
882 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
883 char *buffer, int buffer_size, int *cur_len,
884 struct input_dev *dev)
886 if (*cur_index >= num_envp - 1)
889 envp[*cur_index] = buffer + *cur_len;
891 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
893 if (*cur_len >= buffer_size)
896 *cur_len += input_print_modalias(buffer + *cur_len,
897 max(buffer_size - *cur_len, 0),
899 if (*cur_len > buffer_size)
906 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
908 int err = add_uevent_var(envp, num_envp, &i, \
909 buffer, buffer_size, &len, \
915 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
917 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
918 buffer, buffer_size, &len, \
924 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
926 int err = input_add_uevent_modalias_var(envp, \
928 buffer, buffer_size, &len, \
934 static int input_dev_uevent(struct class_device *cdev, char **envp,
935 int num_envp, char *buffer, int buffer_size)
937 struct input_dev *dev = to_input_dev(cdev);
941 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
942 dev->id.bustype, dev->id.vendor,
943 dev->id.product, dev->id.version);
945 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
947 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
949 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
951 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
952 if (test_bit(EV_KEY, dev->evbit))
953 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
954 if (test_bit(EV_REL, dev->evbit))
955 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
956 if (test_bit(EV_ABS, dev->evbit))
957 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
958 if (test_bit(EV_MSC, dev->evbit))
959 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
960 if (test_bit(EV_LED, dev->evbit))
961 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
962 if (test_bit(EV_SND, dev->evbit))
963 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
964 if (test_bit(EV_FF, dev->evbit))
965 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
966 if (test_bit(EV_SW, dev->evbit))
967 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
969 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
975 struct class input_class = {
977 .release = input_dev_release,
978 .uevent = input_dev_uevent,
980 EXPORT_SYMBOL_GPL(input_class);
983 * input_allocate_device - allocate memory for new input device
985 * Returns prepared struct input_dev or NULL.
987 * NOTE: Use input_free_device() to free devices that have not been
988 * registered; input_unregister_device() should be used for already
989 * registered devices.
991 struct input_dev *input_allocate_device(void)
993 struct input_dev *dev;
995 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
997 dev->cdev.class = &input_class;
998 dev->cdev.groups = input_dev_attr_groups;
999 class_device_initialize(&dev->cdev);
1000 mutex_init(&dev->mutex);
1001 INIT_LIST_HEAD(&dev->h_list);
1002 INIT_LIST_HEAD(&dev->node);
1004 __module_get(THIS_MODULE);
1009 EXPORT_SYMBOL(input_allocate_device);
1012 * input_free_device - free memory occupied by input_dev structure
1013 * @dev: input device to free
1015 * This function should only be used if input_register_device()
1016 * was not called yet or if it failed. Once device was registered
1017 * use input_unregister_device() and memory will be freed once last
1018 * refrence to the device is dropped.
1020 * Device should be allocated by input_allocate_device().
1022 * NOTE: If there are references to the input device then memory
1023 * will not be freed until last reference is dropped.
1025 void input_free_device(struct input_dev *dev)
1028 input_put_device(dev);
1030 EXPORT_SYMBOL(input_free_device);
1032 int input_register_device(struct input_dev *dev)
1034 static atomic_t input_no = ATOMIC_INIT(0);
1035 struct input_handle *handle;
1036 struct input_handler *handler;
1037 const struct input_device_id *id;
1041 set_bit(EV_SYN, dev->evbit);
1044 * If delay and period are pre-set by the driver, then autorepeating
1045 * is handled by the driver itself and we don't do it in input.c.
1048 init_timer(&dev->timer);
1049 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1050 dev->timer.data = (long) dev;
1051 dev->timer.function = input_repeat_key;
1052 dev->rep[REP_DELAY] = 250;
1053 dev->rep[REP_PERIOD] = 33;
1056 if (!dev->getkeycode)
1057 dev->getkeycode = input_default_getkeycode;
1059 if (!dev->setkeycode)
1060 dev->setkeycode = input_default_setkeycode;
1062 list_add_tail(&dev->node, &input_dev_list);
1064 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
1065 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1067 error = class_device_add(&dev->cdev);
1071 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1072 printk(KERN_INFO "input: %s as %s\n",
1073 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1076 list_for_each_entry(handler, &input_handler_list, node)
1077 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1078 if ((id = input_match_device(handler->id_table, dev)))
1079 if ((handle = handler->connect(handler, dev, id))) {
1080 input_link_handle(handle);
1082 handler->start(handle);
1085 input_wakeup_procfs_readers();
1089 EXPORT_SYMBOL(input_register_device);
1091 void input_unregister_device(struct input_dev *dev)
1093 struct list_head *node, *next;
1096 for (code = 0; code <= KEY_MAX; code++)
1097 if (test_bit(code, dev->key))
1098 input_report_key(dev, code, 0);
1101 del_timer_sync(&dev->timer);
1103 list_for_each_safe(node, next, &dev->h_list) {
1104 struct input_handle * handle = to_handle(node);
1105 list_del_init(&handle->d_node);
1106 list_del_init(&handle->h_node);
1107 handle->handler->disconnect(handle);
1110 list_del_init(&dev->node);
1112 class_device_unregister(&dev->cdev);
1114 input_wakeup_procfs_readers();
1116 EXPORT_SYMBOL(input_unregister_device);
1118 int input_register_handler(struct input_handler *handler)
1120 struct input_dev *dev;
1121 struct input_handle *handle;
1122 const struct input_device_id *id;
1124 INIT_LIST_HEAD(&handler->h_list);
1126 if (handler->fops != NULL) {
1127 if (input_table[handler->minor >> 5])
1130 input_table[handler->minor >> 5] = handler;
1133 list_add_tail(&handler->node, &input_handler_list);
1135 list_for_each_entry(dev, &input_dev_list, node)
1136 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1137 if ((id = input_match_device(handler->id_table, dev)))
1138 if ((handle = handler->connect(handler, dev, id))) {
1139 input_link_handle(handle);
1141 handler->start(handle);
1144 input_wakeup_procfs_readers();
1147 EXPORT_SYMBOL(input_register_handler);
1149 void input_unregister_handler(struct input_handler *handler)
1151 struct list_head *node, *next;
1153 list_for_each_safe(node, next, &handler->h_list) {
1154 struct input_handle * handle = to_handle_h(node);
1155 list_del_init(&handle->h_node);
1156 list_del_init(&handle->d_node);
1157 handler->disconnect(handle);
1160 list_del_init(&handler->node);
1162 if (handler->fops != NULL)
1163 input_table[handler->minor >> 5] = NULL;
1165 input_wakeup_procfs_readers();
1167 EXPORT_SYMBOL(input_unregister_handler);
1169 static int input_open_file(struct inode *inode, struct file *file)
1171 struct input_handler *handler = input_table[iminor(inode) >> 5];
1172 const struct file_operations *old_fops, *new_fops = NULL;
1175 /* No load-on-demand here? */
1176 if (!handler || !(new_fops = fops_get(handler->fops)))
1180 * That's _really_ odd. Usually NULL ->open means "nothing special",
1181 * not "no device". Oh, well...
1183 if (!new_fops->open) {
1187 old_fops = file->f_op;
1188 file->f_op = new_fops;
1190 err = new_fops->open(inode, file);
1193 fops_put(file->f_op);
1194 file->f_op = fops_get(old_fops);
1200 static const struct file_operations input_fops = {
1201 .owner = THIS_MODULE,
1202 .open = input_open_file,
1205 static int __init input_init(void)
1209 err = class_register(&input_class);
1211 printk(KERN_ERR "input: unable to register input_dev class\n");
1215 err = input_proc_init();
1219 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1221 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1227 fail2: input_proc_exit();
1228 fail1: class_unregister(&input_class);
1232 static void __exit input_exit(void)
1235 unregister_chrdev(INPUT_MAJOR, "input");
1236 class_unregister(&input_class);
1239 subsys_initcall(input_init);
1240 module_exit(input_exit);