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"
31 enum evdev_clock_type {
40 struct input_handle handle;
41 wait_queue_head_t wait;
42 struct evdev_client __rcu *grab;
43 struct list_head client_list;
44 spinlock_t client_lock; /* protects client_list */
54 unsigned int packet_head; /* [future] position of the first element of next packet */
55 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
56 struct fasync_struct *fasync;
58 struct list_head node;
59 unsigned int clk_type;
61 unsigned long *evmasks[EV_CNT];
63 struct input_event buffer[];
66 static size_t evdev_get_mask_cnt(unsigned int type)
68 static const size_t counts[EV_CNT] = {
69 /* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */
81 return (type < EV_CNT) ? counts[type] : 0;
84 /* requires the buffer lock to be held */
85 static bool __evdev_is_filtered(struct evdev_client *client,
92 /* EV_SYN and unknown codes are never filtered */
93 if (type == EV_SYN || type >= EV_CNT)
96 /* first test whether the type is filtered */
97 mask = client->evmasks[0];
98 if (mask && !test_bit(type, mask))
101 /* unknown values are never filtered */
102 cnt = evdev_get_mask_cnt(type);
103 if (!cnt || code >= cnt)
106 mask = client->evmasks[type];
107 return mask && !test_bit(code, mask);
110 /* flush queued events of type @type, caller must hold client->buffer_lock */
111 static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
113 unsigned int i, head, num;
114 unsigned int mask = client->bufsize - 1;
116 struct input_event *ev;
118 BUG_ON(type == EV_SYN);
121 client->packet_head = client->tail;
123 /* init to 1 so a leading SYN_REPORT will not be dropped */
126 for (i = client->tail; i != client->head; i = (i + 1) & mask) {
127 ev = &client->buffer[i];
128 is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;
130 if (ev->type == type) {
131 /* drop matched entry */
133 } else if (is_report && !num) {
134 /* drop empty SYN_REPORT groups */
136 } else if (head != i) {
137 /* move entry to fill the gap */
138 client->buffer[head].time = ev->time;
139 client->buffer[head].type = ev->type;
140 client->buffer[head].code = ev->code;
141 client->buffer[head].value = ev->value;
145 head = (head + 1) & mask;
149 client->packet_head = head;
156 static void __evdev_queue_syn_dropped(struct evdev_client *client)
158 struct input_event ev;
161 time = client->clk_type == EV_CLK_REAL ?
163 client->clk_type == EV_CLK_MONO ?
165 ktime_get_boottime();
167 ev.time = ktime_to_timeval(time);
169 ev.code = SYN_DROPPED;
172 client->buffer[client->head++] = ev;
173 client->head &= client->bufsize - 1;
175 if (unlikely(client->head == client->tail)) {
176 /* drop queue but keep our SYN_DROPPED event */
177 client->tail = (client->head - 1) & (client->bufsize - 1);
178 client->packet_head = client->tail;
182 static void evdev_queue_syn_dropped(struct evdev_client *client)
186 spin_lock_irqsave(&client->buffer_lock, flags);
187 __evdev_queue_syn_dropped(client);
188 spin_unlock_irqrestore(&client->buffer_lock, flags);
191 static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
194 unsigned int clk_type;
199 clk_type = EV_CLK_REAL;
201 case CLOCK_MONOTONIC:
202 clk_type = EV_CLK_MONO;
205 clk_type = EV_CLK_BOOT;
211 if (client->clk_type != clk_type) {
212 client->clk_type = clk_type;
215 * Flush pending events and queue SYN_DROPPED event,
216 * but only if the queue is not empty.
218 spin_lock_irqsave(&client->buffer_lock, flags);
220 if (client->head != client->tail) {
221 client->packet_head = client->head = client->tail;
222 __evdev_queue_syn_dropped(client);
225 spin_unlock_irqrestore(&client->buffer_lock, flags);
231 static void __pass_event(struct evdev_client *client,
232 const struct input_event *event)
234 client->buffer[client->head++] = *event;
235 client->head &= client->bufsize - 1;
237 if (unlikely(client->head == client->tail)) {
239 * This effectively "drops" all unconsumed events, leaving
240 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
242 client->tail = (client->head - 2) & (client->bufsize - 1);
244 client->buffer[client->tail].time = event->time;
245 client->buffer[client->tail].type = EV_SYN;
246 client->buffer[client->tail].code = SYN_DROPPED;
247 client->buffer[client->tail].value = 0;
249 client->packet_head = client->tail;
252 if (event->type == EV_SYN && event->code == SYN_REPORT) {
253 client->packet_head = client->head;
254 kill_fasync(&client->fasync, SIGIO, POLL_IN);
258 static void evdev_pass_values(struct evdev_client *client,
259 const struct input_value *vals, unsigned int count,
262 struct evdev *evdev = client->evdev;
263 const struct input_value *v;
264 struct input_event event;
270 event.time = ktime_to_timeval(ev_time[client->clk_type]);
272 /* Interrupts are disabled, just acquire the lock. */
273 spin_lock(&client->buffer_lock);
275 for (v = vals; v != vals + count; v++) {
276 if (__evdev_is_filtered(client, v->type, v->code))
279 if (v->type == EV_SYN && v->code == SYN_REPORT) {
280 /* drop empty SYN_REPORT */
281 if (client->packet_head == client->head)
287 event.type = v->type;
288 event.code = v->code;
289 event.value = v->value;
290 __pass_event(client, &event);
293 spin_unlock(&client->buffer_lock);
296 wake_up_interruptible(&evdev->wait);
300 * Pass incoming events to all connected clients.
302 static void evdev_events(struct input_handle *handle,
303 const struct input_value *vals, unsigned int count)
305 struct evdev *evdev = handle->private;
306 struct evdev_client *client;
307 ktime_t ev_time[EV_CLK_MAX];
309 ev_time[EV_CLK_MONO] = ktime_get();
310 ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);
311 ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],
316 client = rcu_dereference(evdev->grab);
319 evdev_pass_values(client, vals, count, ev_time);
321 list_for_each_entry_rcu(client, &evdev->client_list, node)
322 evdev_pass_values(client, vals, count, ev_time);
328 * Pass incoming event to all connected clients.
330 static void evdev_event(struct input_handle *handle,
331 unsigned int type, unsigned int code, int value)
333 struct input_value vals[] = { { type, code, value } };
335 evdev_events(handle, vals, 1);
338 static int evdev_fasync(int fd, struct file *file, int on)
340 struct evdev_client *client = file->private_data;
342 return fasync_helper(fd, file, on, &client->fasync);
345 static void evdev_free(struct device *dev)
347 struct evdev *evdev = container_of(dev, struct evdev, dev);
349 input_put_device(evdev->handle.dev);
354 * Grabs an event device (along with underlying input device).
355 * This function is called with evdev->mutex taken.
357 static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
364 error = input_grab_device(&evdev->handle);
368 rcu_assign_pointer(evdev->grab, client);
373 static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
375 struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
376 lockdep_is_held(&evdev->mutex));
381 rcu_assign_pointer(evdev->grab, NULL);
383 input_release_device(&evdev->handle);
388 static void evdev_attach_client(struct evdev *evdev,
389 struct evdev_client *client)
391 spin_lock(&evdev->client_lock);
392 list_add_tail_rcu(&client->node, &evdev->client_list);
393 spin_unlock(&evdev->client_lock);
396 static void evdev_detach_client(struct evdev *evdev,
397 struct evdev_client *client)
399 spin_lock(&evdev->client_lock);
400 list_del_rcu(&client->node);
401 spin_unlock(&evdev->client_lock);
405 static int evdev_open_device(struct evdev *evdev)
409 retval = mutex_lock_interruptible(&evdev->mutex);
415 else if (!evdev->open++) {
416 retval = input_open_device(&evdev->handle);
421 mutex_unlock(&evdev->mutex);
425 static void evdev_close_device(struct evdev *evdev)
427 mutex_lock(&evdev->mutex);
429 if (evdev->exist && !--evdev->open)
430 input_close_device(&evdev->handle);
432 mutex_unlock(&evdev->mutex);
436 * Wake up users waiting for IO so they can disconnect from
439 static void evdev_hangup(struct evdev *evdev)
441 struct evdev_client *client;
443 spin_lock(&evdev->client_lock);
444 list_for_each_entry(client, &evdev->client_list, node)
445 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
446 spin_unlock(&evdev->client_lock);
448 wake_up_interruptible(&evdev->wait);
451 static int evdev_release(struct inode *inode, struct file *file)
453 struct evdev_client *client = file->private_data;
454 struct evdev *evdev = client->evdev;
457 mutex_lock(&evdev->mutex);
459 if (evdev->exist && !client->revoked)
460 input_flush_device(&evdev->handle, file);
462 evdev_ungrab(evdev, client);
463 mutex_unlock(&evdev->mutex);
465 evdev_detach_client(evdev, client);
467 for (i = 0; i < EV_CNT; ++i)
468 kfree(client->evmasks[i]);
472 evdev_close_device(evdev);
477 static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
479 unsigned int n_events =
480 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
481 EVDEV_MIN_BUFFER_SIZE);
483 return roundup_pow_of_two(n_events);
486 static int evdev_open(struct inode *inode, struct file *file)
488 struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
489 unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
490 unsigned int size = sizeof(struct evdev_client) +
491 bufsize * sizeof(struct input_event);
492 struct evdev_client *client;
495 client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
497 client = vzalloc(size);
501 client->bufsize = bufsize;
502 spin_lock_init(&client->buffer_lock);
503 client->evdev = evdev;
504 evdev_attach_client(evdev, client);
506 error = evdev_open_device(evdev);
508 goto err_free_client;
510 file->private_data = client;
511 nonseekable_open(inode, file);
516 evdev_detach_client(evdev, client);
521 static ssize_t evdev_write(struct file *file, const char __user *buffer,
522 size_t count, loff_t *ppos)
524 struct evdev_client *client = file->private_data;
525 struct evdev *evdev = client->evdev;
526 struct input_event event;
529 if (count != 0 && count < input_event_size())
532 retval = mutex_lock_interruptible(&evdev->mutex);
536 if (!evdev->exist || client->revoked) {
541 while (retval + input_event_size() <= count) {
543 if (input_event_from_user(buffer + retval, &event)) {
547 retval += input_event_size();
549 input_inject_event(&evdev->handle,
550 event.type, event.code, event.value);
554 mutex_unlock(&evdev->mutex);
558 static int evdev_fetch_next_event(struct evdev_client *client,
559 struct input_event *event)
563 spin_lock_irq(&client->buffer_lock);
565 have_event = client->packet_head != client->tail;
567 *event = client->buffer[client->tail++];
568 client->tail &= client->bufsize - 1;
571 spin_unlock_irq(&client->buffer_lock);
576 static ssize_t evdev_read(struct file *file, char __user *buffer,
577 size_t count, loff_t *ppos)
579 struct evdev_client *client = file->private_data;
580 struct evdev *evdev = client->evdev;
581 struct input_event event;
585 if (count != 0 && count < input_event_size())
589 if (!evdev->exist || client->revoked)
592 if (client->packet_head == client->tail &&
593 (file->f_flags & O_NONBLOCK))
597 * count == 0 is special - no IO is done but we check
598 * for error conditions (see above).
603 while (read + input_event_size() <= count &&
604 evdev_fetch_next_event(client, &event)) {
606 if (input_event_to_user(buffer + read, &event))
609 read += input_event_size();
615 if (!(file->f_flags & O_NONBLOCK)) {
616 error = wait_event_interruptible(evdev->wait,
617 client->packet_head != client->tail ||
618 !evdev->exist || client->revoked);
627 /* No kernel lock - fine */
628 static unsigned int evdev_poll(struct file *file, poll_table *wait)
630 struct evdev_client *client = file->private_data;
631 struct evdev *evdev = client->evdev;
634 poll_wait(file, &evdev->wait, wait);
636 if (evdev->exist && !client->revoked)
637 mask = POLLOUT | POLLWRNORM;
639 mask = POLLHUP | POLLERR;
641 if (client->packet_head != client->tail)
642 mask |= POLLIN | POLLRDNORM;
649 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
650 #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
653 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
654 unsigned int maxlen, void __user *p, int compat)
659 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
663 for (i = 0; i < len / sizeof(compat_long_t); i++)
664 if (copy_to_user((compat_long_t __user *) p + i,
665 (compat_long_t *) bits +
666 i + 1 - ((i % 2) << 1),
667 sizeof(compat_long_t)))
670 len = BITS_TO_LONGS(maxbit) * sizeof(long);
674 if (copy_to_user(p, bits, len))
681 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
682 unsigned int maxlen, const void __user *p, int compat)
687 if (maxlen % sizeof(compat_long_t))
690 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
694 for (i = 0; i < len / sizeof(compat_long_t); i++)
695 if (copy_from_user((compat_long_t *) bits +
696 i + 1 - ((i % 2) << 1),
697 (compat_long_t __user *) p + i,
698 sizeof(compat_long_t)))
701 *((compat_long_t *) bits + i - 1) = 0;
704 if (maxlen % sizeof(long))
707 len = BITS_TO_LONGS(maxbit) * sizeof(long);
711 if (copy_from_user(bits, p, len))
720 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
721 unsigned int maxlen, void __user *p, int compat)
724 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
725 BITS_TO_LONGS(maxbit) * sizeof(long);
730 return copy_to_user(p, bits, len) ? -EFAULT : len;
733 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
734 unsigned int maxlen, const void __user *p, int compat)
736 size_t chunk_size = compat ? sizeof(compat_long_t) : sizeof(long);
739 if (maxlen % chunk_size)
742 len = compat ? BITS_TO_LONGS_COMPAT(maxbit) : BITS_TO_LONGS(maxbit);
747 return copy_from_user(bits, p, len) ? -EFAULT : len;
750 #endif /* __BIG_ENDIAN */
754 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
755 unsigned int maxlen, void __user *p, int compat)
757 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
762 return copy_to_user(p, bits, len) ? -EFAULT : len;
765 static int bits_from_user(unsigned long *bits, unsigned int maxbit,
766 unsigned int maxlen, const void __user *p, int compat)
770 if (maxlen % sizeof(long))
773 len = BITS_TO_LONGS(maxbit) * sizeof(long);
777 return copy_from_user(bits, p, len) ? -EFAULT : len;
780 #endif /* CONFIG_COMPAT */
782 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
789 len = strlen(str) + 1;
793 return copy_to_user(p, str, len) ? -EFAULT : len;
796 static int handle_eviocgbit(struct input_dev *dev,
797 unsigned int type, unsigned int size,
798 void __user *p, int compat_mode)
805 case 0: bits = dev->evbit; len = EV_MAX; break;
806 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
807 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
808 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
809 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
810 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
811 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
812 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
813 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
814 default: return -EINVAL;
817 return bits_to_user(bits, len, size, p, compat_mode);
820 static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
822 struct input_keymap_entry ke = {
823 .len = sizeof(unsigned int),
826 int __user *ip = (int __user *)p;
830 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
833 error = input_get_keycode(dev, &ke);
837 if (put_user(ke.keycode, ip + 1))
843 static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
845 struct input_keymap_entry ke;
848 if (copy_from_user(&ke, p, sizeof(ke)))
851 error = input_get_keycode(dev, &ke);
855 if (copy_to_user(p, &ke, sizeof(ke)))
861 static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
863 struct input_keymap_entry ke = {
864 .len = sizeof(unsigned int),
867 int __user *ip = (int __user *)p;
869 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
872 if (get_user(ke.keycode, ip + 1))
875 return input_set_keycode(dev, &ke);
878 static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
880 struct input_keymap_entry ke;
882 if (copy_from_user(&ke, p, sizeof(ke)))
885 if (ke.len > sizeof(ke.scancode))
888 return input_set_keycode(dev, &ke);
892 * If we transfer state to the user, we should flush all pending events
893 * of the same type from the client's queue. Otherwise, they might end up
894 * with duplicate events, which can screw up client's state tracking.
895 * If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED
896 * event so user-space will notice missing events.
899 * We need to take event_lock before buffer_lock to avoid dead-locks. But we
900 * need the even_lock only to guarantee consistent state. We can safely release
901 * it while flushing the queue. This allows input-core to handle filters while
902 * we flush the queue.
904 static int evdev_handle_get_val(struct evdev_client *client,
905 struct input_dev *dev, unsigned int type,
906 unsigned long *bits, unsigned int maxbit,
907 unsigned int maxlen, void __user *p,
914 len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long);
915 mem = kmalloc(len, GFP_KERNEL);
919 spin_lock_irq(&dev->event_lock);
920 spin_lock(&client->buffer_lock);
922 memcpy(mem, bits, len);
924 spin_unlock(&dev->event_lock);
926 __evdev_flush_queue(client, type);
928 spin_unlock_irq(&client->buffer_lock);
930 ret = bits_to_user(mem, maxbit, maxlen, p, compat);
932 evdev_queue_syn_dropped(client);
939 static int evdev_handle_mt_request(struct input_dev *dev,
943 const struct input_mt *mt = dev->mt;
948 if (get_user(code, &ip[0]))
950 if (!mt || !input_is_mt_value(code))
953 max_slots = (size - sizeof(__u32)) / sizeof(__s32);
954 for (i = 0; i < mt->num_slots && i < max_slots; i++) {
955 int value = input_mt_get_value(&mt->slots[i], code);
956 if (put_user(value, &ip[1 + i]))
963 static int evdev_revoke(struct evdev *evdev, struct evdev_client *client,
966 client->revoked = true;
967 evdev_ungrab(evdev, client);
968 input_flush_device(&evdev->handle, file);
969 wake_up_interruptible(&evdev->wait);
974 /* must be called with evdev-mutex held */
975 static int evdev_set_mask(struct evdev_client *client,
977 const void __user *codes,
981 unsigned long flags, *mask, *oldmask;
985 /* we allow unknown types and 'codes_size > size' for forward-compat */
986 cnt = evdev_get_mask_cnt(type);
990 mask = kcalloc(sizeof(unsigned long), BITS_TO_LONGS(cnt), GFP_KERNEL);
994 error = bits_from_user(mask, cnt - 1, codes_size, codes, compat);
1000 spin_lock_irqsave(&client->buffer_lock, flags);
1001 oldmask = client->evmasks[type];
1002 client->evmasks[type] = mask;
1003 spin_unlock_irqrestore(&client->buffer_lock, flags);
1010 /* must be called with evdev-mutex held */
1011 static int evdev_get_mask(struct evdev_client *client,
1017 unsigned long *mask;
1018 size_t cnt, size, xfer_size;
1022 /* we allow unknown types and 'codes_size > size' for forward-compat */
1023 cnt = evdev_get_mask_cnt(type);
1024 size = sizeof(unsigned long) * BITS_TO_LONGS(cnt);
1025 xfer_size = min_t(size_t, codes_size, size);
1028 mask = client->evmasks[type];
1030 error = bits_to_user(mask, cnt - 1,
1031 xfer_size, codes, compat);
1035 /* fake mask with all bits set */
1036 for (i = 0; i < xfer_size; i++)
1037 if (put_user(0xffU, (u8 __user *)codes + i))
1042 if (xfer_size < codes_size)
1043 if (clear_user(codes + xfer_size, codes_size - xfer_size))
1049 static long evdev_do_ioctl(struct file *file, unsigned int cmd,
1050 void __user *p, int compat_mode)
1052 struct evdev_client *client = file->private_data;
1053 struct evdev *evdev = client->evdev;
1054 struct input_dev *dev = evdev->handle.dev;
1055 struct input_absinfo abs;
1056 struct input_mask mask;
1057 struct ff_effect effect;
1058 int __user *ip = (int __user *)p;
1059 unsigned int i, t, u, v;
1063 /* First we check for fixed-length commands */
1067 return put_user(EV_VERSION, ip);
1070 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
1075 if (!test_bit(EV_REP, dev->evbit))
1077 if (put_user(dev->rep[REP_DELAY], ip))
1079 if (put_user(dev->rep[REP_PERIOD], ip + 1))
1084 if (!test_bit(EV_REP, dev->evbit))
1086 if (get_user(u, ip))
1088 if (get_user(v, ip + 1))
1091 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
1092 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
1097 return input_ff_erase(dev, (int)(unsigned long) p, file);
1100 i = test_bit(EV_FF, dev->evbit) ?
1101 dev->ff->max_effects : 0;
1102 if (put_user(i, ip))
1108 return evdev_grab(evdev, client);
1110 return evdev_ungrab(evdev, client);
1116 return evdev_revoke(evdev, client, file);
1119 void __user *codes_ptr;
1121 if (copy_from_user(&mask, p, sizeof(mask)))
1124 codes_ptr = (void __user *)(unsigned long)mask.codes_ptr;
1125 return evdev_get_mask(client,
1126 mask.type, codes_ptr, mask.codes_size,
1131 const void __user *codes_ptr;
1133 if (copy_from_user(&mask, p, sizeof(mask)))
1136 codes_ptr = (const void __user *)(unsigned long)mask.codes_ptr;
1137 return evdev_set_mask(client,
1138 mask.type, codes_ptr, mask.codes_size,
1143 if (copy_from_user(&i, p, sizeof(unsigned int)))
1146 return evdev_set_clk_type(client, i);
1149 return evdev_handle_get_keycode(dev, p);
1152 return evdev_handle_set_keycode(dev, p);
1154 case EVIOCGKEYCODE_V2:
1155 return evdev_handle_get_keycode_v2(dev, p);
1157 case EVIOCSKEYCODE_V2:
1158 return evdev_handle_set_keycode_v2(dev, p);
1161 size = _IOC_SIZE(cmd);
1163 /* Now check variable-length commands */
1164 #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
1165 switch (EVIOC_MASK_SIZE(cmd)) {
1168 return bits_to_user(dev->propbit, INPUT_PROP_MAX,
1169 size, p, compat_mode);
1171 case EVIOCGMTSLOTS(0):
1172 return evdev_handle_mt_request(dev, size, ip);
1175 return evdev_handle_get_val(client, dev, EV_KEY, dev->key,
1176 KEY_MAX, size, p, compat_mode);
1179 return evdev_handle_get_val(client, dev, EV_LED, dev->led,
1180 LED_MAX, size, p, compat_mode);
1183 return evdev_handle_get_val(client, dev, EV_SND, dev->snd,
1184 SND_MAX, size, p, compat_mode);
1187 return evdev_handle_get_val(client, dev, EV_SW, dev->sw,
1188 SW_MAX, size, p, compat_mode);
1191 return str_to_user(dev->name, size, p);
1194 return str_to_user(dev->phys, size, p);
1197 return str_to_user(dev->uniq, size, p);
1199 case EVIOC_MASK_SIZE(EVIOCSFF):
1200 if (input_ff_effect_from_user(p, size, &effect))
1203 error = input_ff_upload(dev, &effect, file);
1207 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
1213 /* Multi-number variable-length handlers */
1214 if (_IOC_TYPE(cmd) != 'E')
1217 if (_IOC_DIR(cmd) == _IOC_READ) {
1219 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
1220 return handle_eviocgbit(dev,
1221 _IOC_NR(cmd) & EV_MAX, size,
1224 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
1229 t = _IOC_NR(cmd) & ABS_MAX;
1230 abs = dev->absinfo[t];
1232 if (copy_to_user(p, &abs, min_t(size_t,
1233 size, sizeof(struct input_absinfo))))
1240 if (_IOC_DIR(cmd) == _IOC_WRITE) {
1242 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1247 t = _IOC_NR(cmd) & ABS_MAX;
1249 if (copy_from_user(&abs, p, min_t(size_t,
1250 size, sizeof(struct input_absinfo))))
1253 if (size < sizeof(struct input_absinfo))
1256 /* We can't change number of reserved MT slots */
1257 if (t == ABS_MT_SLOT)
1261 * Take event lock to ensure that we are not
1262 * changing device parameters in the middle
1265 spin_lock_irq(&dev->event_lock);
1266 dev->absinfo[t] = abs;
1267 spin_unlock_irq(&dev->event_lock);
1276 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
1277 void __user *p, int compat_mode)
1279 struct evdev_client *client = file->private_data;
1280 struct evdev *evdev = client->evdev;
1283 retval = mutex_lock_interruptible(&evdev->mutex);
1287 if (!evdev->exist || client->revoked) {
1292 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
1295 mutex_unlock(&evdev->mutex);
1299 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1301 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
1304 #ifdef CONFIG_COMPAT
1305 static long evdev_ioctl_compat(struct file *file,
1306 unsigned int cmd, unsigned long arg)
1308 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1312 static const struct file_operations evdev_fops = {
1313 .owner = THIS_MODULE,
1315 .write = evdev_write,
1318 .release = evdev_release,
1319 .unlocked_ioctl = evdev_ioctl,
1320 #ifdef CONFIG_COMPAT
1321 .compat_ioctl = evdev_ioctl_compat,
1323 .fasync = evdev_fasync,
1324 .llseek = no_llseek,
1328 * Mark device non-existent. This disables writes, ioctls and
1329 * prevents new users from opening the device. Already posted
1330 * blocking reads will stay, however new ones will fail.
1332 static void evdev_mark_dead(struct evdev *evdev)
1334 mutex_lock(&evdev->mutex);
1335 evdev->exist = false;
1336 mutex_unlock(&evdev->mutex);
1339 static void evdev_cleanup(struct evdev *evdev)
1341 struct input_handle *handle = &evdev->handle;
1343 evdev_mark_dead(evdev);
1344 evdev_hangup(evdev);
1346 cdev_del(&evdev->cdev);
1348 /* evdev is marked dead so no one else accesses evdev->open */
1350 input_flush_device(handle, NULL);
1351 input_close_device(handle);
1356 * Create new evdev device. Note that input core serializes calls
1357 * to connect and disconnect.
1359 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
1360 const struct input_device_id *id)
1362 struct evdev *evdev;
1367 minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true);
1370 pr_err("failed to reserve new minor: %d\n", error);
1374 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
1377 goto err_free_minor;
1380 INIT_LIST_HEAD(&evdev->client_list);
1381 spin_lock_init(&evdev->client_lock);
1382 mutex_init(&evdev->mutex);
1383 init_waitqueue_head(&evdev->wait);
1384 evdev->exist = true;
1387 /* Normalize device number if it falls into legacy range */
1388 if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS)
1389 dev_no -= EVDEV_MINOR_BASE;
1390 dev_set_name(&evdev->dev, "event%d", dev_no);
1392 evdev->handle.dev = input_get_device(dev);
1393 evdev->handle.name = dev_name(&evdev->dev);
1394 evdev->handle.handler = handler;
1395 evdev->handle.private = evdev;
1397 evdev->dev.devt = MKDEV(INPUT_MAJOR, minor);
1398 evdev->dev.class = &input_class;
1399 evdev->dev.parent = &dev->dev;
1400 evdev->dev.release = evdev_free;
1401 device_initialize(&evdev->dev);
1403 error = input_register_handle(&evdev->handle);
1405 goto err_free_evdev;
1407 cdev_init(&evdev->cdev, &evdev_fops);
1408 evdev->cdev.kobj.parent = &evdev->dev.kobj;
1409 error = cdev_add(&evdev->cdev, evdev->dev.devt, 1);
1411 goto err_unregister_handle;
1413 error = device_add(&evdev->dev);
1415 goto err_cleanup_evdev;
1420 evdev_cleanup(evdev);
1421 err_unregister_handle:
1422 input_unregister_handle(&evdev->handle);
1424 put_device(&evdev->dev);
1426 input_free_minor(minor);
1430 static void evdev_disconnect(struct input_handle *handle)
1432 struct evdev *evdev = handle->private;
1434 device_del(&evdev->dev);
1435 evdev_cleanup(evdev);
1436 input_free_minor(MINOR(evdev->dev.devt));
1437 input_unregister_handle(handle);
1438 put_device(&evdev->dev);
1441 static const struct input_device_id evdev_ids[] = {
1442 { .driver_info = 1 }, /* Matches all devices */
1443 { }, /* Terminating zero entry */
1446 MODULE_DEVICE_TABLE(input, evdev_ids);
1448 static struct input_handler evdev_handler = {
1449 .event = evdev_event,
1450 .events = evdev_events,
1451 .connect = evdev_connect,
1452 .disconnect = evdev_disconnect,
1453 .legacy_minors = true,
1454 .minor = EVDEV_MINOR_BASE,
1456 .id_table = evdev_ids,
1459 static int __init evdev_init(void)
1461 return input_register_handler(&evdev_handler);
1464 static void __exit evdev_exit(void)
1466 input_unregister_handler(&evdev_handler);
1469 module_init(evdev_init);
1470 module_exit(evdev_exit);
1472 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1473 MODULE_DESCRIPTION("Input driver event char devices");
1474 MODULE_LICENSE("GPL");