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 EVDEV_MINOR_BASE 64
12 #define EVDEV_MINORS 32
13 #define EVDEV_BUFFER_SIZE 64
15 #include <linux/poll.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/major.h>
21 #include <linux/smp_lock.h>
22 #include <linux/device.h>
23 #include <linux/compat.h>
30 struct input_handle handle;
31 wait_queue_head_t wait;
32 struct evdev_client *grab;
33 struct list_head client_list;
37 struct input_event buffer[EVDEV_BUFFER_SIZE];
40 struct fasync_struct *fasync;
42 struct list_head node;
45 static struct evdev *evdev_table[EVDEV_MINORS];
47 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
49 struct evdev *evdev = handle->private;
50 struct evdev_client *client;
55 do_gettimeofday(&client->buffer[client->head].time);
56 client->buffer[client->head].type = type;
57 client->buffer[client->head].code = code;
58 client->buffer[client->head].value = value;
59 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
61 kill_fasync(&client->fasync, SIGIO, POLL_IN);
63 list_for_each_entry(client, &evdev->client_list, node) {
65 do_gettimeofday(&client->buffer[client->head].time);
66 client->buffer[client->head].type = type;
67 client->buffer[client->head].code = code;
68 client->buffer[client->head].value = value;
69 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
71 kill_fasync(&client->fasync, SIGIO, POLL_IN);
74 wake_up_interruptible(&evdev->wait);
77 static int evdev_fasync(int fd, struct file *file, int on)
79 struct evdev_client *client = file->private_data;
82 retval = fasync_helper(fd, file, on, &client->fasync);
84 return retval < 0 ? retval : 0;
87 static int evdev_flush(struct file *file, fl_owner_t id)
89 struct evdev_client *client = file->private_data;
90 struct evdev *evdev = client->evdev;
95 return input_flush_device(&evdev->handle, file);
98 static void evdev_free(struct evdev *evdev)
100 evdev_table[evdev->minor] = NULL;
104 static int evdev_release(struct inode *inode, struct file *file)
106 struct evdev_client *client = file->private_data;
107 struct evdev *evdev = client->evdev;
109 if (evdev->grab == client) {
110 input_release_device(&evdev->handle);
114 evdev_fasync(-1, file, 0);
115 list_del(&client->node);
118 if (!--evdev->open) {
120 input_close_device(&evdev->handle);
128 static int evdev_open(struct inode *inode, struct file *file)
130 struct evdev_client *client;
132 int i = iminor(inode) - EVDEV_MINOR_BASE;
134 if (i >= EVDEV_MINORS)
137 evdev = evdev_table[i];
139 if (!evdev || !evdev->exist)
142 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
146 client->evdev = evdev;
147 list_add_tail(&client->node, &evdev->client_list);
149 if (!evdev->open++ && evdev->exist)
150 input_open_device(&evdev->handle);
152 file->private_data = client;
158 struct input_event_compat {
159 struct compat_timeval time;
165 /* Note to the author of this code: did it ever occur to
166 you why the ifdefs are needed? Think about it again. -AK */
168 # define COMPAT_TEST is_compat_task()
169 #elif defined(CONFIG_IA64)
170 # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
171 #elif defined(CONFIG_S390)
172 # define COMPAT_TEST test_thread_flag(TIF_31BIT)
173 #elif defined(CONFIG_MIPS)
174 # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
176 # define COMPAT_TEST test_thread_flag(TIF_32BIT)
179 static inline size_t evdev_event_size(void)
182 sizeof(struct input_event_compat) : sizeof(struct input_event);
185 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
188 struct input_event_compat compat_event;
190 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
193 event->time.tv_sec = compat_event.time.tv_sec;
194 event->time.tv_usec = compat_event.time.tv_usec;
195 event->type = compat_event.type;
196 event->code = compat_event.code;
197 event->value = compat_event.value;
200 if (copy_from_user(event, buffer, sizeof(struct input_event)))
207 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
210 struct input_event_compat compat_event;
212 compat_event.time.tv_sec = event->time.tv_sec;
213 compat_event.time.tv_usec = event->time.tv_usec;
214 compat_event.type = event->type;
215 compat_event.code = event->code;
216 compat_event.value = event->value;
218 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
222 if (copy_to_user(buffer, event, sizeof(struct input_event)))
231 static inline size_t evdev_event_size(void)
233 return sizeof(struct input_event);
236 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
238 if (copy_from_user(event, buffer, sizeof(struct input_event)))
244 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
246 if (copy_to_user(buffer, event, sizeof(struct input_event)))
252 #endif /* CONFIG_COMPAT */
254 static ssize_t evdev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
256 struct evdev_client *client = file->private_data;
257 struct evdev *evdev = client->evdev;
258 struct input_event event;
264 while (retval < count) {
266 if (evdev_event_from_user(buffer + retval, &event))
268 input_inject_event(&evdev->handle, event.type, event.code, event.value);
269 retval += evdev_event_size();
275 static ssize_t evdev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
277 struct evdev_client *client = file->private_data;
278 struct evdev *evdev = client->evdev;
281 if (count < evdev_event_size())
284 if (client->head == client->tail && evdev->exist && (file->f_flags & O_NONBLOCK))
287 retval = wait_event_interruptible(evdev->wait,
288 client->head != client->tail || !evdev->exist);
295 while (client->head != client->tail && retval + evdev_event_size() <= count) {
297 struct input_event *event = (struct input_event *) client->buffer + client->tail;
299 if (evdev_event_to_user(buffer + retval, event))
302 client->tail = (client->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
303 retval += evdev_event_size();
309 /* No kernel lock - fine */
310 static unsigned int evdev_poll(struct file *file, poll_table *wait)
312 struct evdev_client *client = file->private_data;
313 struct evdev *evdev = client->evdev;
315 poll_wait(file, &evdev->wait, wait);
316 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
317 (evdev->exist ? 0 : (POLLHUP | POLLERR));
322 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
323 #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
326 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
327 unsigned int maxlen, void __user *p, int compat)
332 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
336 for (i = 0; i < len / sizeof(compat_long_t); i++)
337 if (copy_to_user((compat_long_t __user *) p + i,
338 (compat_long_t *) bits +
339 i + 1 - ((i % 2) << 1),
340 sizeof(compat_long_t)))
343 len = NBITS(maxbit) * sizeof(long);
347 if (copy_to_user(p, bits, len))
354 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
355 unsigned int maxlen, void __user *p, int compat)
358 NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
359 NBITS(maxbit) * sizeof(long);
364 return copy_to_user(p, bits, len) ? -EFAULT : len;
366 #endif /* __BIG_ENDIAN */
370 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
371 unsigned int maxlen, void __user *p, int compat)
373 int len = NBITS(maxbit) * sizeof(long);
378 return copy_to_user(p, bits, len) ? -EFAULT : len;
381 #endif /* CONFIG_COMPAT */
383 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
390 len = strlen(str) + 1;
394 return copy_to_user(p, str, len) ? -EFAULT : len;
397 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
398 void __user *p, int compat_mode)
400 struct evdev_client *client = file->private_data;
401 struct evdev *evdev = client->evdev;
402 struct input_dev *dev = evdev->handle.dev;
403 struct input_absinfo abs;
404 struct ff_effect effect;
405 int __user *ip = (int __user *)p;
415 return put_user(EV_VERSION, ip);
418 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
423 if (!test_bit(EV_REP, dev->evbit))
425 if (put_user(dev->rep[REP_DELAY], ip))
427 if (put_user(dev->rep[REP_PERIOD], ip + 1))
432 if (!test_bit(EV_REP, dev->evbit))
436 if (get_user(v, ip + 1))
439 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
440 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
448 error = dev->getkeycode(dev, t, &v);
452 if (put_user(v, ip + 1))
458 if (get_user(t, ip) || get_user(v, ip + 1))
461 return dev->setkeycode(dev, t, v);
464 if (copy_from_user(&effect, p, sizeof(effect)))
467 error = input_ff_upload(dev, &effect, file);
469 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
475 return input_ff_erase(dev, (int)(unsigned long) p, file);
478 i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
487 if (input_grab_device(&evdev->handle))
489 evdev->grab = client;
492 if (evdev->grab != client)
494 input_release_device(&evdev->handle);
501 if (_IOC_TYPE(cmd) != 'E')
504 if (_IOC_DIR(cmd) == _IOC_READ) {
506 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
511 switch (_IOC_NR(cmd) & EV_MAX) {
512 case 0: bits = dev->evbit; len = EV_MAX; break;
513 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
514 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
515 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
516 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
517 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
518 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
519 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
520 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
521 default: return -EINVAL;
523 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
526 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
527 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
530 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
531 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
534 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
535 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
538 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
539 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
542 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
543 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
545 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
546 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
548 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
549 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
551 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
553 int t = _IOC_NR(cmd) & ABS_MAX;
555 abs.value = dev->abs[t];
556 abs.minimum = dev->absmin[t];
557 abs.maximum = dev->absmax[t];
558 abs.fuzz = dev->absfuzz[t];
559 abs.flat = dev->absflat[t];
561 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
569 if (_IOC_DIR(cmd) == _IOC_WRITE) {
571 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
573 int t = _IOC_NR(cmd) & ABS_MAX;
575 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
578 dev->abs[t] = abs.value;
579 dev->absmin[t] = abs.minimum;
580 dev->absmax[t] = abs.maximum;
581 dev->absfuzz[t] = abs.fuzz;
582 dev->absflat[t] = abs.flat;
591 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
593 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
597 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
599 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
603 static const struct file_operations evdev_fops = {
604 .owner = THIS_MODULE,
606 .write = evdev_write,
609 .release = evdev_release,
610 .unlocked_ioctl = evdev_ioctl,
612 .compat_ioctl = evdev_ioctl_compat,
614 .fasync = evdev_fasync,
618 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
619 const struct input_device_id *id)
622 struct class_device *cdev;
627 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
628 if (minor == EVDEV_MINORS) {
629 printk(KERN_ERR "evdev: no more free evdev devices\n");
633 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
637 INIT_LIST_HEAD(&evdev->client_list);
638 init_waitqueue_head(&evdev->wait);
641 evdev->minor = minor;
642 evdev->handle.dev = dev;
643 evdev->handle.name = evdev->name;
644 evdev->handle.handler = handler;
645 evdev->handle.private = evdev;
646 sprintf(evdev->name, "event%d", minor);
648 evdev_table[minor] = evdev;
650 devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
652 cdev = class_device_create(&input_class, &dev->cdev, devt,
653 dev->cdev.dev, evdev->name);
655 error = PTR_ERR(cdev);
659 /* temporary symlink to keep userspace happy */
660 error = sysfs_create_link(&input_class.subsys.kset.kobj,
661 &cdev->kobj, evdev->name);
663 goto err_cdev_destroy;
665 error = input_register_handle(&evdev->handle);
667 goto err_remove_link;
672 sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
674 class_device_destroy(&input_class, devt);
677 evdev_table[minor] = NULL;
681 static void evdev_disconnect(struct input_handle *handle)
683 struct evdev *evdev = handle->private;
684 struct evdev_client *client;
686 input_unregister_handle(handle);
688 sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
689 class_device_destroy(&input_class,
690 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
694 input_flush_device(handle, NULL);
695 input_close_device(handle);
696 wake_up_interruptible(&evdev->wait);
697 list_for_each_entry(client, &evdev->client_list, node)
698 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
703 static const struct input_device_id evdev_ids[] = {
704 { .driver_info = 1 }, /* Matches all devices */
705 { }, /* Terminating zero entry */
708 MODULE_DEVICE_TABLE(input, evdev_ids);
710 static struct input_handler evdev_handler = {
711 .event = evdev_event,
712 .connect = evdev_connect,
713 .disconnect = evdev_disconnect,
715 .minor = EVDEV_MINOR_BASE,
717 .id_table = evdev_ids,
720 static int __init evdev_init(void)
722 return input_register_handler(&evdev_handler);
725 static void __exit evdev_exit(void)
727 input_unregister_handler(&evdev_handler);
730 module_init(evdev_init);
731 module_exit(evdev_exit);
733 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
734 MODULE_DESCRIPTION("Input driver event char devices");
735 MODULE_LICENSE("GPL");