Merge branch 'upstream'
[linux-2.6] / drivers / input / evdev.c
1 /*
2  * Event char devices, giving access to raw input device events.
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  *
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.
9  */
10
11 #define EVDEV_MINOR_BASE        64
12 #define EVDEV_MINORS            32
13 #define EVDEV_BUFFER_SIZE       64
14
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>
24
25 struct evdev {
26         int exist;
27         int open;
28         int minor;
29         char name[16];
30         struct input_handle handle;
31         wait_queue_head_t wait;
32         struct evdev_list *grab;
33         struct list_head list;
34 };
35
36 struct evdev_list {
37         struct input_event buffer[EVDEV_BUFFER_SIZE];
38         int head;
39         int tail;
40         struct fasync_struct *fasync;
41         struct evdev *evdev;
42         struct list_head node;
43 };
44
45 static struct evdev *evdev_table[EVDEV_MINORS];
46
47 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
48 {
49         struct evdev *evdev = handle->private;
50         struct evdev_list *list;
51
52         if (evdev->grab) {
53                 list = evdev->grab;
54
55                 do_gettimeofday(&list->buffer[list->head].time);
56                 list->buffer[list->head].type = type;
57                 list->buffer[list->head].code = code;
58                 list->buffer[list->head].value = value;
59                 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
60
61                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
62         } else
63                 list_for_each_entry(list, &evdev->list, node) {
64
65                         do_gettimeofday(&list->buffer[list->head].time);
66                         list->buffer[list->head].type = type;
67                         list->buffer[list->head].code = code;
68                         list->buffer[list->head].value = value;
69                         list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
70
71                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
72                 }
73
74         wake_up_interruptible(&evdev->wait);
75 }
76
77 static int evdev_fasync(int fd, struct file *file, int on)
78 {
79         int retval;
80         struct evdev_list *list = file->private_data;
81         retval = fasync_helper(fd, file, on, &list->fasync);
82         return retval < 0 ? retval : 0;
83 }
84
85 static int evdev_flush(struct file * file)
86 {
87         struct evdev_list *list = file->private_data;
88         if (!list->evdev->exist) return -ENODEV;
89         return input_flush_device(&list->evdev->handle, file);
90 }
91
92 static void evdev_free(struct evdev *evdev)
93 {
94         evdev_table[evdev->minor] = NULL;
95         kfree(evdev);
96 }
97
98 static int evdev_release(struct inode * inode, struct file * file)
99 {
100         struct evdev_list *list = file->private_data;
101
102         if (list->evdev->grab == list) {
103                 input_release_device(&list->evdev->handle);
104                 list->evdev->grab = NULL;
105         }
106
107         evdev_fasync(-1, file, 0);
108         list_del(&list->node);
109
110         if (!--list->evdev->open) {
111                 if (list->evdev->exist)
112                         input_close_device(&list->evdev->handle);
113                 else
114                         evdev_free(list->evdev);
115         }
116
117         kfree(list);
118         return 0;
119 }
120
121 static int evdev_open(struct inode * inode, struct file * file)
122 {
123         struct evdev_list *list;
124         int i = iminor(inode) - EVDEV_MINOR_BASE;
125         int accept_err;
126
127         if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
128                 return -ENODEV;
129
130         if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
131                 return accept_err;
132
133         if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL)))
134                 return -ENOMEM;
135
136         list->evdev = evdev_table[i];
137         list_add_tail(&list->node, &evdev_table[i]->list);
138         file->private_data = list;
139
140         if (!list->evdev->open++)
141                 if (list->evdev->exist)
142                         input_open_device(&list->evdev->handle);
143
144         return 0;
145 }
146
147 #ifdef CONFIG_COMPAT
148
149 struct input_event_compat {
150         struct compat_timeval time;
151         __u16 type;
152         __u16 code;
153         __s32 value;
154 };
155
156 /* Note to the author of this code: did it ever occur to
157    you why the ifdefs are needed? Think about it again. -AK */
158 #ifdef CONFIG_X86_64
159 #  define COMPAT_TEST is_compat_task()
160 #elif defined(CONFIG_IA64)
161 #  define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
162 #elif defined(CONFIG_S390)
163 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
164 #elif defined(CONFIG_MIPS)
165 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
166 #else
167 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
168 #endif
169
170 static inline size_t evdev_event_size(void)
171 {
172         return COMPAT_TEST ?
173                 sizeof(struct input_event_compat) : sizeof(struct input_event);
174 }
175
176 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
177 {
178         if (COMPAT_TEST) {
179                 struct input_event_compat compat_event;
180
181                 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
182                         return -EFAULT;
183
184                 event->time.tv_sec = compat_event.time.tv_sec;
185                 event->time.tv_usec = compat_event.time.tv_usec;
186                 event->type = compat_event.type;
187                 event->code = compat_event.code;
188                 event->value = compat_event.value;
189
190         } else {
191                 if (copy_from_user(event, buffer, sizeof(struct input_event)))
192                         return -EFAULT;
193         }
194
195         return 0;
196 }
197
198 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
199 {
200         if (COMPAT_TEST) {
201                 struct input_event_compat compat_event;
202
203                 compat_event.time.tv_sec = event->time.tv_sec;
204                 compat_event.time.tv_usec = event->time.tv_usec;
205                 compat_event.type = event->type;
206                 compat_event.code = event->code;
207                 compat_event.value = event->value;
208
209                 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
210                         return -EFAULT;
211
212         } else {
213                 if (copy_to_user(buffer, event, sizeof(struct input_event)))
214                         return -EFAULT;
215         }
216
217         return 0;
218 }
219
220 #else
221
222 static inline size_t evdev_event_size(void)
223 {
224         return sizeof(struct input_event);
225 }
226
227 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
228 {
229         if (copy_from_user(event, buffer, sizeof(struct input_event)))
230                 return -EFAULT;
231
232         return 0;
233 }
234
235 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
236 {
237         if (copy_to_user(buffer, event, sizeof(struct input_event)))
238                 return -EFAULT;
239
240         return 0;
241 }
242
243 #endif /* CONFIG_COMPAT */
244
245 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
246 {
247         struct evdev_list *list = file->private_data;
248         struct input_event event;
249         int retval = 0;
250
251         if (!list->evdev->exist)
252                 return -ENODEV;
253
254         while (retval < count) {
255
256                 if (evdev_event_from_user(buffer + retval, &event))
257                         return -EFAULT;
258                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
259                 retval += evdev_event_size();
260         }
261
262         return retval;
263 }
264
265 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
266 {
267         struct evdev_list *list = file->private_data;
268         int retval;
269
270         if (count < evdev_event_size())
271                 return -EINVAL;
272
273         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
274                 return -EAGAIN;
275
276         retval = wait_event_interruptible(list->evdev->wait,
277                 list->head != list->tail || (!list->evdev->exist));
278
279         if (retval)
280                 return retval;
281
282         if (!list->evdev->exist)
283                 return -ENODEV;
284
285         while (list->head != list->tail && retval + evdev_event_size() <= count) {
286
287                 struct input_event *event = (struct input_event *) list->buffer + list->tail;
288
289                 if (evdev_event_to_user(buffer + retval, event))
290                         return -EFAULT;
291
292                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
293                 retval += evdev_event_size();
294         }
295
296         return retval;
297 }
298
299 /* No kernel lock - fine */
300 static unsigned int evdev_poll(struct file *file, poll_table *wait)
301 {
302         struct evdev_list *list = file->private_data;
303         poll_wait(file, &list->evdev->wait, wait);
304         return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
305                 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
306 }
307
308 #ifdef CONFIG_COMPAT
309
310 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
311 #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
312
313 #ifdef __BIG_ENDIAN
314 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
315                         unsigned int maxlen, void __user *p, int compat)
316 {
317         int len, i;
318
319         if (compat) {
320                 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
321                 if (len < maxlen)
322                         len = maxlen;
323
324                 for (i = 0; i < len / sizeof(compat_long_t); i++)
325                         if (copy_to_user((compat_long_t __user *) p + i,
326                                          (compat_long_t *) bits +
327                                                 i + 1 - ((i % 2) << 1),
328                                          sizeof(compat_long_t)))
329                                 return -EFAULT;
330         } else {
331                 len = NBITS(maxbit) * sizeof(long);
332                 if (len > maxlen)
333                         len = maxlen;
334
335                 if (copy_to_user(p, bits, len))
336                         return -EFAULT;
337         }
338
339         return len;
340 }
341 #else
342 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
343                         unsigned int maxlen, void __user *p, int compat)
344 {
345         int len = compat ?
346                         NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
347                         NBITS(maxbit) * sizeof(long);
348
349         if (len > maxlen)
350                 len = maxlen;
351
352         return copy_to_user(p, bits, len) ? -EFAULT : len;
353 }
354 #endif /* __BIG_ENDIAN */
355
356 #else
357
358 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
359                         unsigned int maxlen, void __user *p, int compat)
360 {
361         int len = NBITS(maxbit) * sizeof(long);
362
363         if (len > maxlen)
364                 len = maxlen;
365
366         return copy_to_user(p, bits, len) ? -EFAULT : len;
367 }
368
369 #endif /* CONFIG_COMPAT */
370
371 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
372 {
373         int len;
374
375         if (!str)
376                 return -ENOENT;
377
378         len = strlen(str) + 1;
379         if (len > maxlen)
380                 len = maxlen;
381
382         return copy_to_user(p, str, len) ? -EFAULT : len;
383 }
384
385 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
386                                 void __user *p, int compat_mode)
387 {
388         struct evdev_list *list = file->private_data;
389         struct evdev *evdev = list->evdev;
390         struct input_dev *dev = evdev->handle.dev;
391         struct input_absinfo abs;
392         int __user *ip = (int __user *)p;
393         int i, t, u, v;
394
395         if (!evdev->exist)
396                 return -ENODEV;
397
398         switch (cmd) {
399
400                 case EVIOCGVERSION:
401                         return put_user(EV_VERSION, ip);
402
403                 case EVIOCGID:
404                         if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
405                                 return -EFAULT;
406
407                         return 0;
408
409                 case EVIOCGKEYCODE:
410                         if (get_user(t, ip))
411                                 return -EFAULT;
412                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
413                                 return -EINVAL;
414                         if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
415                                 return -EFAULT;
416                         return 0;
417
418                 case EVIOCSKEYCODE:
419                         if (get_user(t, ip))
420                                 return -EFAULT;
421                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
422                                 return -EINVAL;
423                         if (get_user(v, ip + 1))
424                                 return -EFAULT;
425                         if (v < 0 || v > KEY_MAX)
426                                 return -EINVAL;
427                         if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
428                                 return -EINVAL;
429
430                         u = SET_INPUT_KEYCODE(dev, t, v);
431                         clear_bit(u, dev->keybit);
432                         set_bit(v, dev->keybit);
433                         for (i = 0; i < dev->keycodemax; i++)
434                                 if (INPUT_KEYCODE(dev, i) == u)
435                                         set_bit(u, dev->keybit);
436
437                         return 0;
438
439                 case EVIOCSFF:
440                         if (dev->upload_effect) {
441                                 struct ff_effect effect;
442                                 int err;
443
444                                 if (copy_from_user(&effect, p, sizeof(effect)))
445                                         return -EFAULT;
446                                 err = dev->upload_effect(dev, &effect);
447                                 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
448                                         return -EFAULT;
449                                 return err;
450                         } else
451                                 return -ENOSYS;
452
453                 case EVIOCRMFF:
454                         if (!dev->erase_effect)
455                                 return -ENOSYS;
456
457                         return dev->erase_effect(dev, (int)(unsigned long) p);
458
459                 case EVIOCGEFFECTS:
460                         if (put_user(dev->ff_effects_max, ip))
461                                 return -EFAULT;
462                         return 0;
463
464                 case EVIOCGRAB:
465                         if (p) {
466                                 if (evdev->grab)
467                                         return -EBUSY;
468                                 if (input_grab_device(&evdev->handle))
469                                         return -EBUSY;
470                                 evdev->grab = list;
471                                 return 0;
472                         } else {
473                                 if (evdev->grab != list)
474                                         return -EINVAL;
475                                 input_release_device(&evdev->handle);
476                                 evdev->grab = NULL;
477                                 return 0;
478                         }
479
480                 default:
481
482                         if (_IOC_TYPE(cmd) != 'E')
483                                 return -EINVAL;
484
485                         if (_IOC_DIR(cmd) == _IOC_READ) {
486
487                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
488
489                                         long *bits;
490                                         int len;
491
492                                         switch (_IOC_NR(cmd) & EV_MAX) {
493                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
494                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
495                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
496                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
497                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
498                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
499                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
500                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
501                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
502                                                 default: return -EINVAL;
503                                         }
504                                         return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
505                                 }
506
507                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
508                                         return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
509                                                             p, compat_mode);
510
511                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
512                                         return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
513                                                             p, compat_mode);
514
515                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
516                                         return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
517                                                             p, compat_mode);
518
519                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
520                                         return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
521                                                             p, compat_mode);
522
523                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
524                                         return str_to_user(dev->name, _IOC_SIZE(cmd), p);
525
526                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
527                                         return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
528
529                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
530                                         return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
531
532                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
533
534                                         int t = _IOC_NR(cmd) & ABS_MAX;
535
536                                         abs.value = dev->abs[t];
537                                         abs.minimum = dev->absmin[t];
538                                         abs.maximum = dev->absmax[t];
539                                         abs.fuzz = dev->absfuzz[t];
540                                         abs.flat = dev->absflat[t];
541
542                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
543                                                 return -EFAULT;
544
545                                         return 0;
546                                 }
547
548                         }
549
550                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
551
552                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
553
554                                         int t = _IOC_NR(cmd) & ABS_MAX;
555
556                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
557                                                 return -EFAULT;
558
559                                         dev->abs[t] = abs.value;
560                                         dev->absmin[t] = abs.minimum;
561                                         dev->absmax[t] = abs.maximum;
562                                         dev->absfuzz[t] = abs.fuzz;
563                                         dev->absflat[t] = abs.flat;
564
565                                         return 0;
566                                 }
567                         }
568         }
569         return -EINVAL;
570 }
571
572 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
573 {
574         return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
575 }
576
577 #ifdef CONFIG_COMPAT
578 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
579 {
580         return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
581 }
582 #endif
583
584 static struct file_operations evdev_fops = {
585         .owner =        THIS_MODULE,
586         .read =         evdev_read,
587         .write =        evdev_write,
588         .poll =         evdev_poll,
589         .open =         evdev_open,
590         .release =      evdev_release,
591         .unlocked_ioctl = evdev_ioctl,
592 #ifdef CONFIG_COMPAT
593         .compat_ioctl = evdev_ioctl_compat,
594 #endif
595         .fasync =       evdev_fasync,
596         .flush =        evdev_flush
597 };
598
599 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
600 {
601         struct evdev *evdev;
602         struct class_device *cdev;
603         int minor;
604
605         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
606         if (minor == EVDEV_MINORS) {
607                 printk(KERN_ERR "evdev: no more free evdev devices\n");
608                 return NULL;
609         }
610
611         if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
612                 return NULL;
613
614         INIT_LIST_HEAD(&evdev->list);
615         init_waitqueue_head(&evdev->wait);
616
617         evdev->exist = 1;
618         evdev->minor = minor;
619         evdev->handle.dev = dev;
620         evdev->handle.name = evdev->name;
621         evdev->handle.handler = handler;
622         evdev->handle.private = evdev;
623         sprintf(evdev->name, "event%d", minor);
624
625         evdev_table[minor] = evdev;
626
627         cdev = class_device_create(&input_class, &dev->cdev,
628                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
629                         dev->cdev.dev, evdev->name);
630
631         /* temporary symlink to keep userspace happy */
632         sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
633                           evdev->name);
634
635         return &evdev->handle;
636 }
637
638 static void evdev_disconnect(struct input_handle *handle)
639 {
640         struct evdev *evdev = handle->private;
641         struct evdev_list *list;
642
643         sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
644         class_device_destroy(&input_class,
645                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
646         evdev->exist = 0;
647
648         if (evdev->open) {
649                 input_close_device(handle);
650                 wake_up_interruptible(&evdev->wait);
651                 list_for_each_entry(list, &evdev->list, node)
652                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
653         } else
654                 evdev_free(evdev);
655 }
656
657 static struct input_device_id evdev_ids[] = {
658         { .driver_info = 1 },   /* Matches all devices */
659         { },                    /* Terminating zero entry */
660 };
661
662 MODULE_DEVICE_TABLE(input, evdev_ids);
663
664 static struct input_handler evdev_handler = {
665         .event =        evdev_event,
666         .connect =      evdev_connect,
667         .disconnect =   evdev_disconnect,
668         .fops =         &evdev_fops,
669         .minor =        EVDEV_MINOR_BASE,
670         .name =         "evdev",
671         .id_table =     evdev_ids,
672 };
673
674 static int __init evdev_init(void)
675 {
676         input_register_handler(&evdev_handler);
677         return 0;
678 }
679
680 static void __exit evdev_exit(void)
681 {
682         input_unregister_handler(&evdev_handler);
683 }
684
685 module_init(evdev_init);
686 module_exit(evdev_exit);
687
688 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
689 MODULE_DESCRIPTION("Input driver event char devices");
690 MODULE_LICENSE("GPL");