2 * Event char devices, giving access to raw input device events.
4 * Copyright (c) 1999-2002 Vojtech Pavlik
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #define EVDEV_MINOR_BASE 64
14 #define EVDEV_MINORS 32
15 #define EVDEV_MIN_BUFFER_SIZE 64U
16 #define EVDEV_BUF_PACKETS 8
18 #include <linux/poll.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/vmalloc.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/input/mt.h>
26 #include <linux/major.h>
27 #include <linux/device.h>
28 #include <linux/cdev.h>
29 #include "input-compat.h"
33 struct input_handle handle;
34 wait_queue_head_t wait;
35 struct evdev_client __rcu *grab;
36 struct list_head client_list;
37 spinlock_t client_lock; /* protects client_list */
47 unsigned int packet_head; /* [future] position of the first element of next packet */
48 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
49 struct fasync_struct *fasync;
51 struct list_head node;
55 struct input_event buffer[];
58 /* flush queued events of type @type, caller must hold client->buffer_lock */
59 static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
61 unsigned int i, head, num;
62 unsigned int mask = client->bufsize - 1;
64 struct input_event *ev;
66 BUG_ON(type == EV_SYN);
69 client->packet_head = client->tail;
71 /* init to 1 so a leading SYN_REPORT will not be dropped */
74 for (i = client->tail; i != client->head; i = (i + 1) & mask) {
75 ev = &client->buffer[i];
76 is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;
78 if (ev->type == type) {
79 /* drop matched entry */
81 } else if (is_report && !num) {
82 /* drop empty SYN_REPORT groups */
84 } else if (head != i) {
85 /* move entry to fill the gap */
86 client->buffer[head].time = ev->time;
87 client->buffer[head].type = ev->type;
88 client->buffer[head].code = ev->code;
89 client->buffer[head].value = ev->value;
93 head = (head + 1) & mask;
97 client->packet_head = head;
104 /* queue SYN_DROPPED event */
105 static void evdev_queue_syn_dropped(struct evdev_client *client)
108 struct input_event ev;
111 time = (client->clkid == CLOCK_MONOTONIC) ?
112 ktime_get() : ktime_get_real();
114 ev.time = ktime_to_timeval(time);
116 ev.code = SYN_DROPPED;
119 spin_lock_irqsave(&client->buffer_lock, flags);
121 client->buffer[client->head++] = ev;
122 client->head &= client->bufsize - 1;
124 if (unlikely(client->head == client->tail)) {
125 /* drop queue but keep our SYN_DROPPED event */
126 client->tail = (client->head - 1) & (client->bufsize - 1);
127 client->packet_head = client->tail;
130 spin_unlock_irqrestore(&client->buffer_lock, flags);
133 static void __pass_event(struct evdev_client *client,
134 const struct input_event *event)
136 client->buffer[client->head++] = *event;
137 client->head &= client->bufsize - 1;
139 if (unlikely(client->head == client->tail)) {
141 * This effectively "drops" all unconsumed events, leaving
142 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
144 client->tail = (client->head - 2) & (client->bufsize - 1);
146 client->buffer[client->tail].time = event->time;
147 client->buffer[client->tail].type = EV_SYN;
148 client->buffer[client->tail].code = SYN_DROPPED;
149 client->buffer[client->tail].value = 0;
151 client->packet_head = client->tail;
154 if (event->type == EV_SYN && event->code == SYN_REPORT) {
155 client->packet_head = client->head;
156 kill_fasync(&client->fasync, SIGIO, POLL_IN);
160 static void evdev_pass_values(struct evdev_client *client,
161 const struct input_value *vals, unsigned int count,
162 ktime_t mono, ktime_t real)
164 struct evdev *evdev = client->evdev;
165 const struct input_value *v;
166 struct input_event event;
172 event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
175 /* Interrupts are disabled, just acquire the lock. */
176 spin_lock(&client->buffer_lock);
178 for (v = vals; v != vals + count; v++) {
179 event.type = v->type;
180 event.code = v->code;
181 event.value = v->value;
182 __pass_event(client, &event);
183 if (v->type == EV_SYN && v->code == SYN_REPORT)
187 spin_unlock(&client->buffer_lock);
190 wake_up_interruptible(&evdev->wait);
194 * Pass incoming events to all connected clients.
196 static void evdev_events(struct input_handle *handle,
197 const struct input_value *vals, unsigned int count)
199 struct evdev *evdev = handle->private;
200 struct evdev_client *client;
201 ktime_t time_mono, time_real;
203 time_mono = ktime_get();
204 time_real = ktime_mono_to_real(time_mono);
208 client = rcu_dereference(evdev->grab);
211 evdev_pass_values(client, vals, count, time_mono, time_real);
213 list_for_each_entry_rcu(client, &evdev->client_list, node)
214 evdev_pass_values(client, vals, count,
215 time_mono, time_real);
221 * Pass incoming event to all connected clients.
223 static void evdev_event(struct input_handle *handle,
224 unsigned int type, unsigned int code, int value)
226 struct input_value vals[] = { { type, code, value } };
228 evdev_events(handle, vals, 1);
231 static int evdev_fasync(int fd, struct file *file, int on)
233 struct evdev_client *client = file->private_data;
235 return fasync_helper(fd, file, on, &client->fasync);
238 static int evdev_flush(struct file *file, fl_owner_t id)
240 struct evdev_client *client = file->private_data;
241 struct evdev *evdev = client->evdev;
244 retval = mutex_lock_interruptible(&evdev->mutex);
248 if (!evdev->exist || client->revoked)
251 retval = input_flush_device(&evdev->handle, file);
253 mutex_unlock(&evdev->mutex);
257 static void evdev_free(struct device *dev)
259 struct evdev *evdev = container_of(dev, struct evdev, dev);
261 input_put_device(evdev->handle.dev);
266 * Grabs an event device (along with underlying input device).
267 * This function is called with evdev->mutex taken.
269 static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
276 error = input_grab_device(&evdev->handle);
280 rcu_assign_pointer(evdev->grab, client);
285 static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
287 struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
288 lockdep_is_held(&evdev->mutex));
293 rcu_assign_pointer(evdev->grab, NULL);
295 input_release_device(&evdev->handle);
300 static void evdev_attach_client(struct evdev *evdev,
301 struct evdev_client *client)
303 spin_lock(&evdev->client_lock);
304 list_add_tail_rcu(&client->node, &evdev->client_list);
305 spin_unlock(&evdev->client_lock);
308 static void evdev_detach_client(struct evdev *evdev,
309 struct evdev_client *client)
311 spin_lock(&evdev->client_lock);
312 list_del_rcu(&client->node);
313 spin_unlock(&evdev->client_lock);
317 static int evdev_open_device(struct evdev *evdev)
321 retval = mutex_lock_interruptible(&evdev->mutex);
327 else if (!evdev->open++) {
328 retval = input_open_device(&evdev->handle);
333 mutex_unlock(&evdev->mutex);
337 static void evdev_close_device(struct evdev *evdev)
339 mutex_lock(&evdev->mutex);
341 if (evdev->exist && !--evdev->open)
342 input_close_device(&evdev->handle);
344 mutex_unlock(&evdev->mutex);
348 * Wake up users waiting for IO so they can disconnect from
351 static void evdev_hangup(struct evdev *evdev)
353 struct evdev_client *client;
355 spin_lock(&evdev->client_lock);
356 list_for_each_entry(client, &evdev->client_list, node)
357 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
358 spin_unlock(&evdev->client_lock);
360 wake_up_interruptible(&evdev->wait);
363 static int evdev_release(struct inode *inode, struct file *file)
365 struct evdev_client *client = file->private_data;
366 struct evdev *evdev = client->evdev;
368 mutex_lock(&evdev->mutex);
369 evdev_ungrab(evdev, client);
370 mutex_unlock(&evdev->mutex);
372 evdev_detach_client(evdev, client);
374 if (is_vmalloc_addr(client))
379 evdev_close_device(evdev);
384 static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
386 unsigned int n_events =
387 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
388 EVDEV_MIN_BUFFER_SIZE);
390 return roundup_pow_of_two(n_events);
393 static int evdev_open(struct inode *inode, struct file *file)
395 struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
396 unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
397 unsigned int size = sizeof(struct evdev_client) +
398 bufsize * sizeof(struct input_event);
399 struct evdev_client *client;
402 client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
404 client = vzalloc(size);
408 client->bufsize = bufsize;
409 spin_lock_init(&client->buffer_lock);
410 client->evdev = evdev;
411 evdev_attach_client(evdev, client);
413 error = evdev_open_device(evdev);
415 goto err_free_client;
417 file->private_data = client;
418 nonseekable_open(inode, file);
423 evdev_detach_client(evdev, client);
428 static ssize_t evdev_write(struct file *file, const char __user *buffer,
429 size_t count, loff_t *ppos)
431 struct evdev_client *client = file->private_data;
432 struct evdev *evdev = client->evdev;
433 struct input_event event;
436 if (count != 0 && count < input_event_size())
439 retval = mutex_lock_interruptible(&evdev->mutex);
443 if (!evdev->exist || client->revoked) {
448 while (retval + input_event_size() <= count) {
450 if (input_event_from_user(buffer + retval, &event)) {
454 retval += input_event_size();
456 input_inject_event(&evdev->handle,
457 event.type, event.code, event.value);
461 mutex_unlock(&evdev->mutex);
465 static int evdev_fetch_next_event(struct evdev_client *client,
466 struct input_event *event)
470 spin_lock_irq(&client->buffer_lock);
472 have_event = client->packet_head != client->tail;
474 *event = client->buffer[client->tail++];
475 client->tail &= client->bufsize - 1;
478 spin_unlock_irq(&client->buffer_lock);
483 static ssize_t evdev_read(struct file *file, char __user *buffer,
484 size_t count, loff_t *ppos)
486 struct evdev_client *client = file->private_data;
487 struct evdev *evdev = client->evdev;
488 struct input_event event;
492 if (count != 0 && count < input_event_size())
496 if (!evdev->exist || client->revoked)
499 if (client->packet_head == client->tail &&
500 (file->f_flags & O_NONBLOCK))
504 * count == 0 is special - no IO is done but we check
505 * for error conditions (see above).
510 while (read + input_event_size() <= count &&
511 evdev_fetch_next_event(client, &event)) {
513 if (input_event_to_user(buffer + read, &event))
516 read += input_event_size();
522 if (!(file->f_flags & O_NONBLOCK)) {
523 error = wait_event_interruptible(evdev->wait,
524 client->packet_head != client->tail ||
525 !evdev->exist || client->revoked);
534 /* No kernel lock - fine */
535 static unsigned int evdev_poll(struct file *file, poll_table *wait)
537 struct evdev_client *client = file->private_data;
538 struct evdev *evdev = client->evdev;
541 poll_wait(file, &evdev->wait, wait);
543 if (evdev->exist && !client->revoked)
544 mask = POLLOUT | POLLWRNORM;
546 mask = POLLHUP | POLLERR;
548 if (client->packet_head != client->tail)
549 mask |= POLLIN | POLLRDNORM;
556 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
557 #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
560 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
561 unsigned int maxlen, void __user *p, int compat)
566 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
570 for (i = 0; i < len / sizeof(compat_long_t); i++)
571 if (copy_to_user((compat_long_t __user *) p + i,
572 (compat_long_t *) bits +
573 i + 1 - ((i % 2) << 1),
574 sizeof(compat_long_t)))
577 len = BITS_TO_LONGS(maxbit) * sizeof(long);
581 if (copy_to_user(p, bits, len))
588 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
589 unsigned int maxlen, void __user *p, int compat)
592 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
593 BITS_TO_LONGS(maxbit) * sizeof(long);
598 return copy_to_user(p, bits, len) ? -EFAULT : len;
600 #endif /* __BIG_ENDIAN */
604 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
605 unsigned int maxlen, void __user *p, int compat)
607 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
612 return copy_to_user(p, bits, len) ? -EFAULT : len;
615 #endif /* CONFIG_COMPAT */
617 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
624 len = strlen(str) + 1;
628 return copy_to_user(p, str, len) ? -EFAULT : len;
631 static int handle_eviocgbit(struct input_dev *dev,
632 unsigned int type, unsigned int size,
633 void __user *p, int compat_mode)
640 case 0: bits = dev->evbit; len = EV_MAX; break;
641 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
642 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
643 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
644 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
645 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
646 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
647 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
648 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
649 default: return -EINVAL;
652 return bits_to_user(bits, len, size, p, compat_mode);
655 static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
657 struct input_keymap_entry ke = {
658 .len = sizeof(unsigned int),
661 int __user *ip = (int __user *)p;
665 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
668 error = input_get_keycode(dev, &ke);
672 if (put_user(ke.keycode, ip + 1))
678 static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
680 struct input_keymap_entry ke;
683 if (copy_from_user(&ke, p, sizeof(ke)))
686 error = input_get_keycode(dev, &ke);
690 if (copy_to_user(p, &ke, sizeof(ke)))
696 static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
698 struct input_keymap_entry ke = {
699 .len = sizeof(unsigned int),
702 int __user *ip = (int __user *)p;
704 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
707 if (get_user(ke.keycode, ip + 1))
710 return input_set_keycode(dev, &ke);
713 static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
715 struct input_keymap_entry ke;
717 if (copy_from_user(&ke, p, sizeof(ke)))
720 if (ke.len > sizeof(ke.scancode))
723 return input_set_keycode(dev, &ke);
727 * If we transfer state to the user, we should flush all pending events
728 * of the same type from the client's queue. Otherwise, they might end up
729 * with duplicate events, which can screw up client's state tracking.
730 * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED
731 * event so user-space will notice missing events.
734 * We need to take event_lock before buffer_lock to avoid dead-locks. But we
735 * need the even_lock only to guarantee consistent state. We can safely release
736 * it while flushing the queue. This allows input-core to handle filters while
737 * we flush the queue.
739 static int evdev_handle_get_val(struct evdev_client *client,
740 struct input_dev *dev, unsigned int type,
741 unsigned long *bits, unsigned int maxbit,
742 unsigned int maxlen, void __user *p,
749 len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long);
750 mem = kmalloc(len, GFP_KERNEL);
754 spin_lock_irq(&dev->event_lock);
755 spin_lock(&client->buffer_lock);
757 memcpy(mem, bits, len);
759 spin_unlock(&dev->event_lock);
761 __evdev_flush_queue(client, type);
763 spin_unlock_irq(&client->buffer_lock);
765 ret = bits_to_user(mem, maxbit, maxlen, p, compat);
767 evdev_queue_syn_dropped(client);
774 static int evdev_handle_mt_request(struct input_dev *dev,
778 const struct input_mt *mt = dev->mt;
783 if (get_user(code, &ip[0]))
785 if (!mt || !input_is_mt_value(code))
788 max_slots = (size - sizeof(__u32)) / sizeof(__s32);
789 for (i = 0; i < mt->num_slots && i < max_slots; i++) {
790 int value = input_mt_get_value(&mt->slots[i], code);
791 if (put_user(value, &ip[1 + i]))
798 static int evdev_revoke(struct evdev *evdev, struct evdev_client *client,
801 client->revoked = true;
802 evdev_ungrab(evdev, client);
803 input_flush_device(&evdev->handle, file);
804 wake_up_interruptible(&evdev->wait);
809 static long evdev_do_ioctl(struct file *file, unsigned int cmd,
810 void __user *p, int compat_mode)
812 struct evdev_client *client = file->private_data;
813 struct evdev *evdev = client->evdev;
814 struct input_dev *dev = evdev->handle.dev;
815 struct input_absinfo abs;
816 struct ff_effect effect;
817 int __user *ip = (int __user *)p;
818 unsigned int i, t, u, v;
822 /* First we check for fixed-length commands */
826 return put_user(EV_VERSION, ip);
829 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
834 if (!test_bit(EV_REP, dev->evbit))
836 if (put_user(dev->rep[REP_DELAY], ip))
838 if (put_user(dev->rep[REP_PERIOD], ip + 1))
843 if (!test_bit(EV_REP, dev->evbit))
847 if (get_user(v, ip + 1))
850 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
851 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
856 return input_ff_erase(dev, (int)(unsigned long) p, file);
859 i = test_bit(EV_FF, dev->evbit) ?
860 dev->ff->max_effects : 0;
867 return evdev_grab(evdev, client);
869 return evdev_ungrab(evdev, client);
875 return evdev_revoke(evdev, client, file);
878 if (copy_from_user(&i, p, sizeof(unsigned int)))
880 if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME)
886 return evdev_handle_get_keycode(dev, p);
889 return evdev_handle_set_keycode(dev, p);
891 case EVIOCGKEYCODE_V2:
892 return evdev_handle_get_keycode_v2(dev, p);
894 case EVIOCSKEYCODE_V2:
895 return evdev_handle_set_keycode_v2(dev, p);
898 size = _IOC_SIZE(cmd);
900 /* Now check variable-length commands */
901 #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
902 switch (EVIOC_MASK_SIZE(cmd)) {
905 return bits_to_user(dev->propbit, INPUT_PROP_MAX,
906 size, p, compat_mode);
908 case EVIOCGMTSLOTS(0):
909 return evdev_handle_mt_request(dev, size, ip);
912 return evdev_handle_get_val(client, dev, EV_KEY, dev->key,
913 KEY_MAX, size, p, compat_mode);
916 return evdev_handle_get_val(client, dev, EV_LED, dev->led,
917 LED_MAX, size, p, compat_mode);
920 return evdev_handle_get_val(client, dev, EV_SND, dev->snd,
921 SND_MAX, size, p, compat_mode);
924 return evdev_handle_get_val(client, dev, EV_SW, dev->sw,
925 SW_MAX, size, p, compat_mode);
928 return str_to_user(dev->name, size, p);
931 return str_to_user(dev->phys, size, p);
934 return str_to_user(dev->uniq, size, p);
936 case EVIOC_MASK_SIZE(EVIOCSFF):
937 if (input_ff_effect_from_user(p, size, &effect))
940 error = input_ff_upload(dev, &effect, file);
944 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
950 /* Multi-number variable-length handlers */
951 if (_IOC_TYPE(cmd) != 'E')
954 if (_IOC_DIR(cmd) == _IOC_READ) {
956 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
957 return handle_eviocgbit(dev,
958 _IOC_NR(cmd) & EV_MAX, size,
961 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
966 t = _IOC_NR(cmd) & ABS_MAX;
967 abs = dev->absinfo[t];
969 if (copy_to_user(p, &abs, min_t(size_t,
970 size, sizeof(struct input_absinfo))))
977 if (_IOC_DIR(cmd) == _IOC_WRITE) {
979 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
984 t = _IOC_NR(cmd) & ABS_MAX;
986 if (copy_from_user(&abs, p, min_t(size_t,
987 size, sizeof(struct input_absinfo))))
990 if (size < sizeof(struct input_absinfo))
993 /* We can't change number of reserved MT slots */
994 if (t == ABS_MT_SLOT)
998 * Take event lock to ensure that we are not
999 * changing device parameters in the middle
1002 spin_lock_irq(&dev->event_lock);
1003 dev->absinfo[t] = abs;
1004 spin_unlock_irq(&dev->event_lock);
1013 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
1014 void __user *p, int compat_mode)
1016 struct evdev_client *client = file->private_data;
1017 struct evdev *evdev = client->evdev;
1020 retval = mutex_lock_interruptible(&evdev->mutex);
1024 if (!evdev->exist || client->revoked) {
1029 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
1032 mutex_unlock(&evdev->mutex);
1036 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1038 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
1041 #ifdef CONFIG_COMPAT
1042 static long evdev_ioctl_compat(struct file *file,
1043 unsigned int cmd, unsigned long arg)
1045 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1049 static const struct file_operations evdev_fops = {
1050 .owner = THIS_MODULE,
1052 .write = evdev_write,
1055 .release = evdev_release,
1056 .unlocked_ioctl = evdev_ioctl,
1057 #ifdef CONFIG_COMPAT
1058 .compat_ioctl = evdev_ioctl_compat,
1060 .fasync = evdev_fasync,
1061 .flush = evdev_flush,
1062 .llseek = no_llseek,
1066 * Mark device non-existent. This disables writes, ioctls and
1067 * prevents new users from opening the device. Already posted
1068 * blocking reads will stay, however new ones will fail.
1070 static void evdev_mark_dead(struct evdev *evdev)
1072 mutex_lock(&evdev->mutex);
1073 evdev->exist = false;
1074 mutex_unlock(&evdev->mutex);
1077 static void evdev_cleanup(struct evdev *evdev)
1079 struct input_handle *handle = &evdev->handle;
1081 evdev_mark_dead(evdev);
1082 evdev_hangup(evdev);
1084 cdev_del(&evdev->cdev);
1086 /* evdev is marked dead so no one else accesses evdev->open */
1088 input_flush_device(handle, NULL);
1089 input_close_device(handle);
1094 * Create new evdev device. Note that input core serializes calls
1095 * to connect and disconnect.
1097 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
1098 const struct input_device_id *id)
1100 struct evdev *evdev;
1105 minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true);
1108 pr_err("failed to reserve new minor: %d\n", error);
1112 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
1115 goto err_free_minor;
1118 INIT_LIST_HEAD(&evdev->client_list);
1119 spin_lock_init(&evdev->client_lock);
1120 mutex_init(&evdev->mutex);
1121 init_waitqueue_head(&evdev->wait);
1122 evdev->exist = true;
1125 /* Normalize device number if it falls into legacy range */
1126 if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS)
1127 dev_no -= EVDEV_MINOR_BASE;
1128 dev_set_name(&evdev->dev, "event%d", dev_no);
1130 evdev->handle.dev = input_get_device(dev);
1131 evdev->handle.name = dev_name(&evdev->dev);
1132 evdev->handle.handler = handler;
1133 evdev->handle.private = evdev;
1135 evdev->dev.devt = MKDEV(INPUT_MAJOR, minor);
1136 evdev->dev.class = &input_class;
1137 evdev->dev.parent = &dev->dev;
1138 evdev->dev.release = evdev_free;
1139 device_initialize(&evdev->dev);
1141 error = input_register_handle(&evdev->handle);
1143 goto err_free_evdev;
1145 cdev_init(&evdev->cdev, &evdev_fops);
1146 evdev->cdev.kobj.parent = &evdev->dev.kobj;
1147 error = cdev_add(&evdev->cdev, evdev->dev.devt, 1);
1149 goto err_unregister_handle;
1151 error = device_add(&evdev->dev);
1153 goto err_cleanup_evdev;
1158 evdev_cleanup(evdev);
1159 err_unregister_handle:
1160 input_unregister_handle(&evdev->handle);
1162 put_device(&evdev->dev);
1164 input_free_minor(minor);
1168 static void evdev_disconnect(struct input_handle *handle)
1170 struct evdev *evdev = handle->private;
1172 device_del(&evdev->dev);
1173 evdev_cleanup(evdev);
1174 input_free_minor(MINOR(evdev->dev.devt));
1175 input_unregister_handle(handle);
1176 put_device(&evdev->dev);
1179 static const struct input_device_id evdev_ids[] = {
1180 { .driver_info = 1 }, /* Matches all devices */
1181 { }, /* Terminating zero entry */
1184 MODULE_DEVICE_TABLE(input, evdev_ids);
1186 static struct input_handler evdev_handler = {
1187 .event = evdev_event,
1188 .events = evdev_events,
1189 .connect = evdev_connect,
1190 .disconnect = evdev_disconnect,
1191 .legacy_minors = true,
1192 .minor = EVDEV_MINOR_BASE,
1194 .id_table = evdev_ids,
1197 static int __init evdev_init(void)
1199 return input_register_handler(&evdev_handler);
1202 static void __exit evdev_exit(void)
1204 input_unregister_handler(&evdev_handler);
1207 module_init(evdev_init);
1208 module_exit(evdev_exit);
1210 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1211 MODULE_DESCRIPTION("Input driver event char devices");
1212 MODULE_LICENSE("GPL");