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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
25struct 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
36struct 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
45static struct evdev *evdev_table[EVDEV_MINORS];
46
47static 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
77static int evdev_fasync(int fd, struct file *file, int on)
78{
79 int retval;
80 struct evdev_list *list = file->private_data;
81
82 retval = fasync_helper(fd, file, on, &list->fasync);
83
84 return retval < 0 ? retval : 0;
85}
86
87static int evdev_flush(struct file *file, fl_owner_t id)
88{
89 struct evdev_list *list = file->private_data;
90
91 if (!list->evdev->exist)
92 return -ENODEV;
93
94 return input_flush_device(&list->evdev->handle, file);
95}
96
97static void evdev_free(struct evdev *evdev)
98{
99 evdev_table[evdev->minor] = NULL;
100 kfree(evdev);
101}
102
103static int evdev_release(struct inode * inode, struct file * file)
104{
105 struct evdev_list *list = file->private_data;
106
107 if (list->evdev->grab == list) {
108 input_release_device(&list->evdev->handle);
109 list->evdev->grab = NULL;
110 }
111
112 evdev_fasync(-1, file, 0);
113 list_del(&list->node);
114
115 if (!--list->evdev->open) {
116 if (list->evdev->exist)
117 input_close_device(&list->evdev->handle);
118 else
119 evdev_free(list->evdev);
120 }
121
122 kfree(list);
123 return 0;
124}
125
126static int evdev_open(struct inode * inode, struct file * file)
127{
128 struct evdev_list *list;
129 int i = iminor(inode) - EVDEV_MINOR_BASE;
130
131 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
132 return -ENODEV;
133
134 if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL)))
135 return -ENOMEM;
136
137 list->evdev = evdev_table[i];
138 list_add_tail(&list->node, &evdev_table[i]->list);
139 file->private_data = list;
140
141 if (!list->evdev->open++)
142 if (list->evdev->exist)
143 input_open_device(&list->evdev->handle);
144
145 return 0;
146}
147
148#ifdef CONFIG_COMPAT
149
150struct input_event_compat {
151 struct compat_timeval time;
152 __u16 type;
153 __u16 code;
154 __s32 value;
155};
156
157
158
159#ifdef CONFIG_X86_64
160# define COMPAT_TEST is_compat_task()
161#elif defined(CONFIG_IA64)
162# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
163#elif defined(CONFIG_S390)
164# define COMPAT_TEST test_thread_flag(TIF_31BIT)
165#elif defined(CONFIG_MIPS)
166# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
167#else
168# define COMPAT_TEST test_thread_flag(TIF_32BIT)
169#endif
170
171static inline size_t evdev_event_size(void)
172{
173 return COMPAT_TEST ?
174 sizeof(struct input_event_compat) : sizeof(struct input_event);
175}
176
177static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
178{
179 if (COMPAT_TEST) {
180 struct input_event_compat compat_event;
181
182 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
183 return -EFAULT;
184
185 event->time.tv_sec = compat_event.time.tv_sec;
186 event->time.tv_usec = compat_event.time.tv_usec;
187 event->type = compat_event.type;
188 event->code = compat_event.code;
189 event->value = compat_event.value;
190
191 } else {
192 if (copy_from_user(event, buffer, sizeof(struct input_event)))
193 return -EFAULT;
194 }
195
196 return 0;
197}
198
199static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
200{
201 if (COMPAT_TEST) {
202 struct input_event_compat compat_event;
203
204 compat_event.time.tv_sec = event->time.tv_sec;
205 compat_event.time.tv_usec = event->time.tv_usec;
206 compat_event.type = event->type;
207 compat_event.code = event->code;
208 compat_event.value = event->value;
209
210 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
211 return -EFAULT;
212
213 } else {
214 if (copy_to_user(buffer, event, sizeof(struct input_event)))
215 return -EFAULT;
216 }
217
218 return 0;
219}
220
221#else
222
223static inline size_t evdev_event_size(void)
224{
225 return sizeof(struct input_event);
226}
227
228static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
229{
230 if (copy_from_user(event, buffer, sizeof(struct input_event)))
231 return -EFAULT;
232
233 return 0;
234}
235
236static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
237{
238 if (copy_to_user(buffer, event, sizeof(struct input_event)))
239 return -EFAULT;
240
241 return 0;
242}
243
244#endif
245
246static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
247{
248 struct evdev_list *list = file->private_data;
249 struct input_event event;
250 int retval = 0;
251
252 if (!list->evdev->exist)
253 return -ENODEV;
254
255 while (retval < count) {
256
257 if (evdev_event_from_user(buffer + retval, &event))
258 return -EFAULT;
259 input_inject_event(&list->evdev->handle, event.type, event.code, event.value);
260 retval += evdev_event_size();
261 }
262
263 return retval;
264}
265
266static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
267{
268 struct evdev_list *list = file->private_data;
269 int retval;
270
271 if (count < evdev_event_size())
272 return -EINVAL;
273
274 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
275 return -EAGAIN;
276
277 retval = wait_event_interruptible(list->evdev->wait,
278 list->head != list->tail || (!list->evdev->exist));
279
280 if (retval)
281 return retval;
282
283 if (!list->evdev->exist)
284 return -ENODEV;
285
286 while (list->head != list->tail && retval + evdev_event_size() <= count) {
287
288 struct input_event *event = (struct input_event *) list->buffer + list->tail;
289
290 if (evdev_event_to_user(buffer + retval, event))
291 return -EFAULT;
292
293 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
294 retval += evdev_event_size();
295 }
296
297 return retval;
298}
299
300
301static unsigned int evdev_poll(struct file *file, poll_table *wait)
302{
303 struct evdev_list *list = file->private_data;
304
305 poll_wait(file, &list->evdev->wait, wait);
306 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
307 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
308}
309
310#ifdef CONFIG_COMPAT
311
312#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
313#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
314
315#ifdef __BIG_ENDIAN
316static int bits_to_user(unsigned long *bits, unsigned int maxbit,
317 unsigned int maxlen, void __user *p, int compat)
318{
319 int len, i;
320
321 if (compat) {
322 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
323 if (len < maxlen)
324 len = maxlen;
325
326 for (i = 0; i < len / sizeof(compat_long_t); i++)
327 if (copy_to_user((compat_long_t __user *) p + i,
328 (compat_long_t *) bits +
329 i + 1 - ((i % 2) << 1),
330 sizeof(compat_long_t)))
331 return -EFAULT;
332 } else {
333 len = NBITS(maxbit) * sizeof(long);
334 if (len > maxlen)
335 len = maxlen;
336
337 if (copy_to_user(p, bits, len))
338 return -EFAULT;
339 }
340
341 return len;
342}
343#else
344static int bits_to_user(unsigned long *bits, unsigned int maxbit,
345 unsigned int maxlen, void __user *p, int compat)
346{
347 int len = compat ?
348 NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
349 NBITS(maxbit) * sizeof(long);
350
351 if (len > maxlen)
352 len = maxlen;
353
354 return copy_to_user(p, bits, len) ? -EFAULT : len;
355}
356#endif
357
358#else
359
360static int bits_to_user(unsigned long *bits, unsigned int maxbit,
361 unsigned int maxlen, void __user *p, int compat)
362{
363 int len = NBITS(maxbit) * sizeof(long);
364
365 if (len > maxlen)
366 len = maxlen;
367
368 return copy_to_user(p, bits, len) ? -EFAULT : len;
369}
370
371#endif
372
373static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
374{
375 int len;
376
377 if (!str)
378 return -ENOENT;
379
380 len = strlen(str) + 1;
381 if (len > maxlen)
382 len = maxlen;
383
384 return copy_to_user(p, str, len) ? -EFAULT : len;
385}
386
387static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
388 void __user *p, int compat_mode)
389{
390 struct evdev_list *list = file->private_data;
391 struct evdev *evdev = list->evdev;
392 struct input_dev *dev = evdev->handle.dev;
393 struct input_absinfo abs;
394 int __user *ip = (int __user *)p;
395 int i, t, u, v;
396
397 if (!evdev->exist)
398 return -ENODEV;
399
400 switch (cmd) {
401
402 case EVIOCGVERSION:
403 return put_user(EV_VERSION, ip);
404
405 case EVIOCGID:
406 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
407 return -EFAULT;
408 return 0;
409
410 case EVIOCGREP:
411 if (!test_bit(EV_REP, dev->evbit))
412 return -ENOSYS;
413 if (put_user(dev->rep[REP_DELAY], ip))
414 return -EFAULT;
415 if (put_user(dev->rep[REP_PERIOD], ip + 1))
416 return -EFAULT;
417 return 0;
418
419 case EVIOCSREP:
420 if (!test_bit(EV_REP, dev->evbit))
421 return -ENOSYS;
422 if (get_user(u, ip))
423 return -EFAULT;
424 if (get_user(v, ip + 1))
425 return -EFAULT;
426
427 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
428 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
429
430 return 0;
431
432 case EVIOCGKEYCODE:
433 if (get_user(t, ip))
434 return -EFAULT;
435 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
436 return -EINVAL;
437 if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
438 return -EFAULT;
439 return 0;
440
441 case EVIOCSKEYCODE:
442 if (get_user(t, ip))
443 return -EFAULT;
444 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
445 return -EINVAL;
446 if (get_user(v, ip + 1))
447 return -EFAULT;
448 if (v < 0 || v > KEY_MAX)
449 return -EINVAL;
450 if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
451 return -EINVAL;
452
453 u = SET_INPUT_KEYCODE(dev, t, v);
454 clear_bit(u, dev->keybit);
455 set_bit(v, dev->keybit);
456 for (i = 0; i < dev->keycodemax; i++)
457 if (INPUT_KEYCODE(dev, i) == u)
458 set_bit(u, dev->keybit);
459
460 return 0;
461
462 case EVIOCSFF:
463 if (dev->upload_effect) {
464 struct ff_effect effect;
465 int err;
466
467 if (copy_from_user(&effect, p, sizeof(effect)))
468 return -EFAULT;
469 err = dev->upload_effect(dev, &effect);
470 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
471 return -EFAULT;
472 return err;
473 } else
474 return -ENOSYS;
475
476 case EVIOCRMFF:
477 if (!dev->erase_effect)
478 return -ENOSYS;
479
480 return dev->erase_effect(dev, (int)(unsigned long) p);
481
482 case EVIOCGEFFECTS:
483 if (put_user(dev->ff_effects_max, ip))
484 return -EFAULT;
485 return 0;
486
487 case EVIOCGRAB:
488 if (p) {
489 if (evdev->grab)
490 return -EBUSY;
491 if (input_grab_device(&evdev->handle))
492 return -EBUSY;
493 evdev->grab = list;
494 return 0;
495 } else {
496 if (evdev->grab != list)
497 return -EINVAL;
498 input_release_device(&evdev->handle);
499 evdev->grab = NULL;
500 return 0;
501 }
502
503 default:
504
505 if (_IOC_TYPE(cmd) != 'E')
506 return -EINVAL;
507
508 if (_IOC_DIR(cmd) == _IOC_READ) {
509
510 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
511
512 long *bits;
513 int len;
514
515 switch (_IOC_NR(cmd) & EV_MAX) {
516 case 0: bits = dev->evbit; len = EV_MAX; break;
517 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
518 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
519 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
520 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
521 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
522 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
523 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
524 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
525 default: return -EINVAL;
526 }
527 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
528 }
529
530 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
531 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
532 p, compat_mode);
533
534 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
535 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
536 p, compat_mode);
537
538 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
539 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
540 p, compat_mode);
541
542 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
543 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
544 p, compat_mode);
545
546 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
547 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
548
549 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
550 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
551
552 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
553 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
554
555 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
556
557 int t = _IOC_NR(cmd) & ABS_MAX;
558
559 abs.value = dev->abs[t];
560 abs.minimum = dev->absmin[t];
561 abs.maximum = dev->absmax[t];
562 abs.fuzz = dev->absfuzz[t];
563 abs.flat = dev->absflat[t];
564
565 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
566 return -EFAULT;
567
568 return 0;
569 }
570
571 }
572
573 if (_IOC_DIR(cmd) == _IOC_WRITE) {
574
575 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
576
577 int t = _IOC_NR(cmd) & ABS_MAX;
578
579 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
580 return -EFAULT;
581
582 dev->abs[t] = abs.value;
583 dev->absmin[t] = abs.minimum;
584 dev->absmax[t] = abs.maximum;
585 dev->absfuzz[t] = abs.fuzz;
586 dev->absflat[t] = abs.flat;
587
588 return 0;
589 }
590 }
591 }
592 return -EINVAL;
593}
594
595static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
596{
597 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
598}
599
600#ifdef CONFIG_COMPAT
601static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
602{
603 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
604}
605#endif
606
607static struct file_operations evdev_fops = {
608 .owner = THIS_MODULE,
609 .read = evdev_read,
610 .write = evdev_write,
611 .poll = evdev_poll,
612 .open = evdev_open,
613 .release = evdev_release,
614 .unlocked_ioctl = evdev_ioctl,
615#ifdef CONFIG_COMPAT
616 .compat_ioctl = evdev_ioctl_compat,
617#endif
618 .fasync = evdev_fasync,
619 .flush = evdev_flush
620};
621
622static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
623{
624 struct evdev *evdev;
625 struct class_device *cdev;
626 int minor;
627
628 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
629 if (minor == EVDEV_MINORS) {
630 printk(KERN_ERR "evdev: no more free evdev devices\n");
631 return NULL;
632 }
633
634 if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
635 return NULL;
636
637 INIT_LIST_HEAD(&evdev->list);
638 init_waitqueue_head(&evdev->wait);
639
640 evdev->exist = 1;
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);
647
648 evdev_table[minor] = evdev;
649
650 cdev = class_device_create(&input_class, &dev->cdev,
651 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
652 dev->cdev.dev, evdev->name);
653
654
655 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
656 evdev->name);
657
658 return &evdev->handle;
659}
660
661static void evdev_disconnect(struct input_handle *handle)
662{
663 struct evdev *evdev = handle->private;
664 struct evdev_list *list;
665
666 sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
667 class_device_destroy(&input_class,
668 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
669 evdev->exist = 0;
670
671 if (evdev->open) {
672 input_close_device(handle);
673 wake_up_interruptible(&evdev->wait);
674 list_for_each_entry(list, &evdev->list, node)
675 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
676 } else
677 evdev_free(evdev);
678}
679
680static struct input_device_id evdev_ids[] = {
681 { .driver_info = 1 },
682 { },
683};
684
685MODULE_DEVICE_TABLE(input, evdev_ids);
686
687static struct input_handler evdev_handler = {
688 .event = evdev_event,
689 .connect = evdev_connect,
690 .disconnect = evdev_disconnect,
691 .fops = &evdev_fops,
692 .minor = EVDEV_MINOR_BASE,
693 .name = "evdev",
694 .id_table = evdev_ids,
695};
696
697static int __init evdev_init(void)
698{
699 input_register_handler(&evdev_handler);
700 return 0;
701}
702
703static void __exit evdev_exit(void)
704{
705 input_unregister_handler(&evdev_handler);
706}
707
708module_init(evdev_init);
709module_exit(evdev_exit);
710
711MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
712MODULE_DESCRIPTION("Input driver event char devices");
713MODULE_LICENSE("GPL");
714
