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 void input_link_handle(struct input_handle *handle)
304 list_add_tail(&handle->d_node, &handle->dev->h_list);
305 list_add_tail(&handle->h_node, &handle->handler->h_list);
308 #define MATCH_BIT(bit, max) \
309 for (i = 0; i < NBITS(max); i++) \
310 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
312 if (i != NBITS(max)) \
315 static const struct input_device_id *input_match_device(const struct input_device_id *id,
316 struct input_dev *dev)
320 for (; id->flags || id->driver_info; id++) {
322 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
323 if (id->bustype != dev->id.bustype)
326 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
327 if (id->vendor != dev->id.vendor)
330 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
331 if (id->product != dev->id.product)
334 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
335 if (id->version != dev->id.version)
338 MATCH_BIT(evbit, EV_MAX);
339 MATCH_BIT(keybit, KEY_MAX);
340 MATCH_BIT(relbit, REL_MAX);
341 MATCH_BIT(absbit, ABS_MAX);
342 MATCH_BIT(mscbit, MSC_MAX);
343 MATCH_BIT(ledbit, LED_MAX);
344 MATCH_BIT(sndbit, SND_MAX);
345 MATCH_BIT(ffbit, FF_MAX);
346 MATCH_BIT(swbit, SW_MAX);
354 #ifdef CONFIG_PROC_FS
356 static struct proc_dir_entry *proc_bus_input_dir;
357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
358 static int input_devices_state;
360 static inline void input_wakeup_procfs_readers(void)
362 input_devices_state++;
363 wake_up(&input_devices_poll_wait);
366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
368 int state = input_devices_state;
370 poll_wait(file, &input_devices_poll_wait, wait);
371 if (state != input_devices_state)
372 return POLLIN | POLLRDNORM;
377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
379 struct list_head *node;
382 list_for_each(node, list)
389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
391 if (element->next == list)
395 return element->next;
398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
400 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
402 return list_get_nth_element(&input_dev_list, pos);
405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
407 return list_get_next_element(&input_dev_list, v, pos);
410 static void input_devices_seq_stop(struct seq_file *seq, void *v)
412 /* release lock here */
415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
416 unsigned long *bitmap, int max)
420 for (i = NBITS(max) - 1; i > 0; i--)
424 seq_printf(seq, "B: %s=", name);
426 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
430 static int input_devices_seq_show(struct seq_file *seq, void *v)
432 struct input_dev *dev = container_of(v, struct input_dev, node);
433 const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
434 struct input_handle *handle;
436 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
437 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
439 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
440 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
441 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
442 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
443 seq_printf(seq, "H: Handlers=");
445 list_for_each_entry(handle, &dev->h_list, d_node)
446 seq_printf(seq, "%s ", handle->name);
449 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
450 if (test_bit(EV_KEY, dev->evbit))
451 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
452 if (test_bit(EV_REL, dev->evbit))
453 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
454 if (test_bit(EV_ABS, dev->evbit))
455 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
456 if (test_bit(EV_MSC, dev->evbit))
457 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
458 if (test_bit(EV_LED, dev->evbit))
459 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
460 if (test_bit(EV_SND, dev->evbit))
461 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
462 if (test_bit(EV_FF, dev->evbit))
463 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
464 if (test_bit(EV_SW, dev->evbit))
465 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
473 static struct seq_operations input_devices_seq_ops = {
474 .start = input_devices_seq_start,
475 .next = input_devices_seq_next,
476 .stop = input_devices_seq_stop,
477 .show = input_devices_seq_show,
480 static int input_proc_devices_open(struct inode *inode, struct file *file)
482 return seq_open(file, &input_devices_seq_ops);
485 static const struct file_operations input_devices_fileops = {
486 .owner = THIS_MODULE,
487 .open = input_proc_devices_open,
488 .poll = input_proc_devices_poll,
491 .release = seq_release,
494 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
496 /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
497 seq->private = (void *)(unsigned long)*pos;
498 return list_get_nth_element(&input_handler_list, pos);
501 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
503 seq->private = (void *)(unsigned long)(*pos + 1);
504 return list_get_next_element(&input_handler_list, v, pos);
507 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
509 /* release lock here */
512 static int input_handlers_seq_show(struct seq_file *seq, void *v)
514 struct input_handler *handler = container_of(v, struct input_handler, node);
516 seq_printf(seq, "N: Number=%ld Name=%s",
517 (unsigned long)seq->private, handler->name);
519 seq_printf(seq, " Minor=%d", handler->minor);
524 static struct seq_operations input_handlers_seq_ops = {
525 .start = input_handlers_seq_start,
526 .next = input_handlers_seq_next,
527 .stop = input_handlers_seq_stop,
528 .show = input_handlers_seq_show,
531 static int input_proc_handlers_open(struct inode *inode, struct file *file)
533 return seq_open(file, &input_handlers_seq_ops);
536 static const struct file_operations input_handlers_fileops = {
537 .owner = THIS_MODULE,
538 .open = input_proc_handlers_open,
541 .release = seq_release,
544 static int __init input_proc_init(void)
546 struct proc_dir_entry *entry;
548 proc_bus_input_dir = proc_mkdir("input", proc_bus);
549 if (!proc_bus_input_dir)
552 proc_bus_input_dir->owner = THIS_MODULE;
554 entry = create_proc_entry("devices", 0, proc_bus_input_dir);
558 entry->owner = THIS_MODULE;
559 entry->proc_fops = &input_devices_fileops;
561 entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
565 entry->owner = THIS_MODULE;
566 entry->proc_fops = &input_handlers_fileops;
570 fail2: remove_proc_entry("devices", proc_bus_input_dir);
571 fail1: remove_proc_entry("input", proc_bus);
575 static void input_proc_exit(void)
577 remove_proc_entry("devices", proc_bus_input_dir);
578 remove_proc_entry("handlers", proc_bus_input_dir);
579 remove_proc_entry("input", proc_bus);
582 #else /* !CONFIG_PROC_FS */
583 static inline void input_wakeup_procfs_readers(void) { }
584 static inline int input_proc_init(void) { return 0; }
585 static inline void input_proc_exit(void) { }
588 #define INPUT_DEV_STRING_ATTR_SHOW(name) \
589 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
591 struct input_dev *input_dev = to_input_dev(dev); \
593 return scnprintf(buf, PAGE_SIZE, "%s\n", \
594 input_dev->name ? input_dev->name : ""); \
596 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
598 INPUT_DEV_STRING_ATTR_SHOW(name);
599 INPUT_DEV_STRING_ATTR_SHOW(phys);
600 INPUT_DEV_STRING_ATTR_SHOW(uniq);
602 static int input_print_modalias_bits(char *buf, int size,
603 char name, unsigned long *bm,
604 unsigned int min_bit, unsigned int max_bit)
608 len += snprintf(buf, max(size, 0), "%c", name);
609 for (i = min_bit; i < max_bit; i++)
610 if (bm[LONG(i)] & BIT(i))
611 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
615 static int input_print_modalias(char *buf, int size, struct input_dev *id,
620 len = snprintf(buf, max(size, 0),
621 "input:b%04Xv%04Xp%04Xe%04X-",
622 id->id.bustype, id->id.vendor,
623 id->id.product, id->id.version);
625 len += input_print_modalias_bits(buf + len, size - len,
626 'e', id->evbit, 0, EV_MAX);
627 len += input_print_modalias_bits(buf + len, size - len,
628 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
629 len += input_print_modalias_bits(buf + len, size - len,
630 'r', id->relbit, 0, REL_MAX);
631 len += input_print_modalias_bits(buf + len, size - len,
632 'a', id->absbit, 0, ABS_MAX);
633 len += input_print_modalias_bits(buf + len, size - len,
634 'm', id->mscbit, 0, MSC_MAX);
635 len += input_print_modalias_bits(buf + len, size - len,
636 'l', id->ledbit, 0, LED_MAX);
637 len += input_print_modalias_bits(buf + len, size - len,
638 's', id->sndbit, 0, SND_MAX);
639 len += input_print_modalias_bits(buf + len, size - len,
640 'f', id->ffbit, 0, FF_MAX);
641 len += input_print_modalias_bits(buf + len, size - len,
642 'w', id->swbit, 0, SW_MAX);
645 len += snprintf(buf + len, max(size - len, 0), "\n");
650 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
652 struct input_dev *id = to_input_dev(dev);
655 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
657 return min_t(int, len, PAGE_SIZE);
659 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
661 static struct attribute *input_dev_attrs[] = {
662 &class_device_attr_name.attr,
663 &class_device_attr_phys.attr,
664 &class_device_attr_uniq.attr,
665 &class_device_attr_modalias.attr,
669 static struct attribute_group input_dev_attr_group = {
670 .attrs = input_dev_attrs,
673 #define INPUT_DEV_ID_ATTR(name) \
674 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
676 struct input_dev *input_dev = to_input_dev(dev); \
677 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
679 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
681 INPUT_DEV_ID_ATTR(bustype);
682 INPUT_DEV_ID_ATTR(vendor);
683 INPUT_DEV_ID_ATTR(product);
684 INPUT_DEV_ID_ATTR(version);
686 static struct attribute *input_dev_id_attrs[] = {
687 &class_device_attr_bustype.attr,
688 &class_device_attr_vendor.attr,
689 &class_device_attr_product.attr,
690 &class_device_attr_version.attr,
694 static struct attribute_group input_dev_id_attr_group = {
696 .attrs = input_dev_id_attrs,
699 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
705 for (i = NBITS(max) - 1; i > 0; i--)
710 len += snprintf(buf + len, max(buf_size - len, 0),
711 "%lx%s", bitmap[i], i > 0 ? " " : "");
714 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
719 #define INPUT_DEV_CAP_ATTR(ev, bm) \
720 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
722 struct input_dev *input_dev = to_input_dev(dev); \
723 int len = input_print_bitmap(buf, PAGE_SIZE, \
724 input_dev->bm##bit, ev##_MAX, 1); \
725 return min_t(int, len, PAGE_SIZE); \
727 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
729 INPUT_DEV_CAP_ATTR(EV, ev);
730 INPUT_DEV_CAP_ATTR(KEY, key);
731 INPUT_DEV_CAP_ATTR(REL, rel);
732 INPUT_DEV_CAP_ATTR(ABS, abs);
733 INPUT_DEV_CAP_ATTR(MSC, msc);
734 INPUT_DEV_CAP_ATTR(LED, led);
735 INPUT_DEV_CAP_ATTR(SND, snd);
736 INPUT_DEV_CAP_ATTR(FF, ff);
737 INPUT_DEV_CAP_ATTR(SW, sw);
739 static struct attribute *input_dev_caps_attrs[] = {
740 &class_device_attr_ev.attr,
741 &class_device_attr_key.attr,
742 &class_device_attr_rel.attr,
743 &class_device_attr_abs.attr,
744 &class_device_attr_msc.attr,
745 &class_device_attr_led.attr,
746 &class_device_attr_snd.attr,
747 &class_device_attr_ff.attr,
748 &class_device_attr_sw.attr,
752 static struct attribute_group input_dev_caps_attr_group = {
753 .name = "capabilities",
754 .attrs = input_dev_caps_attrs,
757 static void input_dev_release(struct class_device *class_dev)
759 struct input_dev *dev = to_input_dev(class_dev);
761 input_ff_destroy(dev);
764 module_put(THIS_MODULE);
768 * Input uevent interface - loading event handlers based on
771 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
772 char *buffer, int buffer_size, int *cur_len,
773 const char *name, unsigned long *bitmap, int max)
775 if (*cur_index >= num_envp - 1)
778 envp[*cur_index] = buffer + *cur_len;
780 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
781 if (*cur_len >= buffer_size)
784 *cur_len += input_print_bitmap(buffer + *cur_len,
785 max(buffer_size - *cur_len, 0),
787 if (*cur_len > buffer_size)
794 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
795 char *buffer, int buffer_size, int *cur_len,
796 struct input_dev *dev)
798 if (*cur_index >= num_envp - 1)
801 envp[*cur_index] = buffer + *cur_len;
803 *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
805 if (*cur_len >= buffer_size)
808 *cur_len += input_print_modalias(buffer + *cur_len,
809 max(buffer_size - *cur_len, 0),
811 if (*cur_len > buffer_size)
818 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
820 int err = add_uevent_var(envp, num_envp, &i, \
821 buffer, buffer_size, &len, \
827 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
829 int err = input_add_uevent_bm_var(envp, num_envp, &i, \
830 buffer, buffer_size, &len, \
836 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
838 int err = input_add_uevent_modalias_var(envp, \
840 buffer, buffer_size, &len, \
846 static int input_dev_uevent(struct class_device *cdev, char **envp,
847 int num_envp, char *buffer, int buffer_size)
849 struct input_dev *dev = to_input_dev(cdev);
853 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
854 dev->id.bustype, dev->id.vendor,
855 dev->id.product, dev->id.version);
857 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
859 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
861 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
863 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
864 if (test_bit(EV_KEY, dev->evbit))
865 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
866 if (test_bit(EV_REL, dev->evbit))
867 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
868 if (test_bit(EV_ABS, dev->evbit))
869 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
870 if (test_bit(EV_MSC, dev->evbit))
871 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
872 if (test_bit(EV_LED, dev->evbit))
873 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
874 if (test_bit(EV_SND, dev->evbit))
875 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
876 if (test_bit(EV_FF, dev->evbit))
877 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
878 if (test_bit(EV_SW, dev->evbit))
879 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
881 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
887 struct class input_class = {
889 .release = input_dev_release,
890 .uevent = input_dev_uevent,
892 EXPORT_SYMBOL_GPL(input_class);
895 * input_allocate_device - allocate memory for new input device
897 * Returns prepared struct input_dev or NULL.
899 * NOTE: Use input_free_device() to free devices that have not been
900 * registered; input_unregister_device() should be used for already
901 * registered devices.
903 struct input_dev *input_allocate_device(void)
905 struct input_dev *dev;
907 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
909 dev->cdev.class = &input_class;
910 class_device_initialize(&dev->cdev);
911 mutex_init(&dev->mutex);
912 INIT_LIST_HEAD(&dev->h_list);
913 INIT_LIST_HEAD(&dev->node);
915 __module_get(THIS_MODULE);
920 EXPORT_SYMBOL(input_allocate_device);
923 * input_free_device - free memory occupied by input_dev structure
924 * @dev: input device to free
926 * This function should only be used if input_register_device()
927 * was not called yet or if it failed. Once device was registered
928 * use input_unregister_device() and memory will be freed once last
929 * refrence to the device is dropped.
931 * Device should be allocated by input_allocate_device().
933 * NOTE: If there are references to the input device then memory
934 * will not be freed until last reference is dropped.
936 void input_free_device(struct input_dev *dev)
940 mutex_lock(&dev->mutex);
941 dev->name = dev->phys = dev->uniq = NULL;
942 mutex_unlock(&dev->mutex);
944 input_put_device(dev);
947 EXPORT_SYMBOL(input_free_device);
949 int input_register_device(struct input_dev *dev)
951 static atomic_t input_no = ATOMIC_INIT(0);
952 struct input_handle *handle;
953 struct input_handler *handler;
954 const struct input_device_id *id;
958 set_bit(EV_SYN, dev->evbit);
961 * If delay and period are pre-set by the driver, then autorepeating
962 * is handled by the driver itself and we don't do it in input.c.
965 init_timer(&dev->timer);
966 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
967 dev->timer.data = (long) dev;
968 dev->timer.function = input_repeat_key;
969 dev->rep[REP_DELAY] = 250;
970 dev->rep[REP_PERIOD] = 33;
973 list_add_tail(&dev->node, &input_dev_list);
975 snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
976 "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
978 error = class_device_add(&dev->cdev);
982 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
986 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
990 error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
994 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
995 printk(KERN_INFO "input: %s as %s\n",
996 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
999 list_for_each_entry(handler, &input_handler_list, node)
1000 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1001 if ((id = input_match_device(handler->id_table, dev)))
1002 if ((handle = handler->connect(handler, dev, id))) {
1003 input_link_handle(handle);
1005 handler->start(handle);
1008 input_wakeup_procfs_readers();
1012 fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1013 fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1014 fail1: class_device_del(&dev->cdev);
1017 EXPORT_SYMBOL(input_register_device);
1019 void input_unregister_device(struct input_dev *dev)
1021 struct list_head *node, *next;
1024 for (code = 0; code <= KEY_MAX; code++)
1025 if (test_bit(code, dev->key))
1026 input_report_key(dev, code, 0);
1029 del_timer_sync(&dev->timer);
1031 list_for_each_safe(node, next, &dev->h_list) {
1032 struct input_handle * handle = to_handle(node);
1033 list_del_init(&handle->d_node);
1034 list_del_init(&handle->h_node);
1035 handle->handler->disconnect(handle);
1038 list_del_init(&dev->node);
1040 sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1041 sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1042 sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1044 class_device_unregister(&dev->cdev);
1046 input_wakeup_procfs_readers();
1048 EXPORT_SYMBOL(input_unregister_device);
1050 int input_register_handler(struct input_handler *handler)
1052 struct input_dev *dev;
1053 struct input_handle *handle;
1054 const struct input_device_id *id;
1056 INIT_LIST_HEAD(&handler->h_list);
1058 if (handler->fops != NULL) {
1059 if (input_table[handler->minor >> 5])
1062 input_table[handler->minor >> 5] = handler;
1065 list_add_tail(&handler->node, &input_handler_list);
1067 list_for_each_entry(dev, &input_dev_list, node)
1068 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1069 if ((id = input_match_device(handler->id_table, dev)))
1070 if ((handle = handler->connect(handler, dev, id))) {
1071 input_link_handle(handle);
1073 handler->start(handle);
1076 input_wakeup_procfs_readers();
1079 EXPORT_SYMBOL(input_register_handler);
1081 void input_unregister_handler(struct input_handler *handler)
1083 struct list_head *node, *next;
1085 list_for_each_safe(node, next, &handler->h_list) {
1086 struct input_handle * handle = to_handle_h(node);
1087 list_del_init(&handle->h_node);
1088 list_del_init(&handle->d_node);
1089 handler->disconnect(handle);
1092 list_del_init(&handler->node);
1094 if (handler->fops != NULL)
1095 input_table[handler->minor >> 5] = NULL;
1097 input_wakeup_procfs_readers();
1099 EXPORT_SYMBOL(input_unregister_handler);
1101 static int input_open_file(struct inode *inode, struct file *file)
1103 struct input_handler *handler = input_table[iminor(inode) >> 5];
1104 const struct file_operations *old_fops, *new_fops = NULL;
1107 /* No load-on-demand here? */
1108 if (!handler || !(new_fops = fops_get(handler->fops)))
1112 * That's _really_ odd. Usually NULL ->open means "nothing special",
1113 * not "no device". Oh, well...
1115 if (!new_fops->open) {
1119 old_fops = file->f_op;
1120 file->f_op = new_fops;
1122 err = new_fops->open(inode, file);
1125 fops_put(file->f_op);
1126 file->f_op = fops_get(old_fops);
1132 static const struct file_operations input_fops = {
1133 .owner = THIS_MODULE,
1134 .open = input_open_file,
1137 static int __init input_init(void)
1141 err = class_register(&input_class);
1143 printk(KERN_ERR "input: unable to register input_dev class\n");
1147 err = input_proc_init();
1151 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1153 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1159 fail2: input_proc_exit();
1160 fail1: class_unregister(&input_class);
1164 static void __exit input_exit(void)
1167 unregister_chrdev(INPUT_MAJOR, "input");
1168 class_unregister(&input_class);
1171 subsys_initcall(input_init);
1172 module_exit(input_exit);