Merge 'upstream' branch of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/jgarzik...
[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/devfs_fs_kernel.h>
24 #include <linux/compat.h>
25
26 struct evdev {
27         int exist;
28         int open;
29         int minor;
30         char name[16];
31         struct input_handle handle;
32         wait_queue_head_t wait;
33         struct evdev_list *grab;
34         struct list_head list;
35 };
36
37 struct evdev_list {
38         struct input_event buffer[EVDEV_BUFFER_SIZE];
39         int head;
40         int tail;
41         struct fasync_struct *fasync;
42         struct evdev *evdev;
43         struct list_head node;
44 };
45
46 static struct evdev *evdev_table[EVDEV_MINORS];
47
48 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
49 {
50         struct evdev *evdev = handle->private;
51         struct evdev_list *list;
52
53         if (evdev->grab) {
54                 list = evdev->grab;
55
56                 do_gettimeofday(&list->buffer[list->head].time);
57                 list->buffer[list->head].type = type;
58                 list->buffer[list->head].code = code;
59                 list->buffer[list->head].value = value;
60                 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
61
62                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
63         } else
64                 list_for_each_entry(list, &evdev->list, node) {
65
66                         do_gettimeofday(&list->buffer[list->head].time);
67                         list->buffer[list->head].type = type;
68                         list->buffer[list->head].code = code;
69                         list->buffer[list->head].value = value;
70                         list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
71
72                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
73                 }
74
75         wake_up_interruptible(&evdev->wait);
76 }
77
78 static int evdev_fasync(int fd, struct file *file, int on)
79 {
80         int retval;
81         struct evdev_list *list = file->private_data;
82         retval = fasync_helper(fd, file, on, &list->fasync);
83         return retval < 0 ? retval : 0;
84 }
85
86 static int evdev_flush(struct file * file)
87 {
88         struct evdev_list *list = file->private_data;
89         if (!list->evdev->exist) return -ENODEV;
90         return input_flush_device(&list->evdev->handle, file);
91 }
92
93 static void evdev_free(struct evdev *evdev)
94 {
95         evdev_table[evdev->minor] = NULL;
96         kfree(evdev);
97 }
98
99 static int evdev_release(struct inode * inode, struct file * file)
100 {
101         struct evdev_list *list = file->private_data;
102
103         if (list->evdev->grab == list) {
104                 input_release_device(&list->evdev->handle);
105                 list->evdev->grab = NULL;
106         }
107
108         evdev_fasync(-1, file, 0);
109         list_del(&list->node);
110
111         if (!--list->evdev->open) {
112                 if (list->evdev->exist)
113                         input_close_device(&list->evdev->handle);
114                 else
115                         evdev_free(list->evdev);
116         }
117
118         kfree(list);
119         return 0;
120 }
121
122 static int evdev_open(struct inode * inode, struct file * file)
123 {
124         struct evdev_list *list;
125         int i = iminor(inode) - EVDEV_MINOR_BASE;
126         int accept_err;
127
128         if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
129                 return -ENODEV;
130
131         if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
132                 return accept_err;
133
134         if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
135                 return -ENOMEM;
136         memset(list, 0, sizeof(struct evdev_list));
137
138         list->evdev = evdev_table[i];
139         list_add_tail(&list->node, &evdev_table[i]->list);
140         file->private_data = list;
141
142         if (!list->evdev->open++)
143                 if (list->evdev->exist)
144                         input_open_device(&list->evdev->handle);
145
146         return 0;
147 }
148
149 #ifdef CONFIG_COMPAT
150 struct input_event_compat {
151         struct compat_timeval time;
152         __u16 type;
153         __u16 code;
154         __s32 value;
155 };
156
157 #ifdef CONFIG_X86_64
158 #  define COMPAT_TEST test_thread_flag(TIF_IA32)
159 #elif defined(CONFIG_IA64)
160 #  define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
161 #elif defined(CONFIG_ARCH_S390)
162 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
163 #else
164 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
165 #endif
166
167 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
168 {
169         struct evdev_list *list = file->private_data;
170         struct input_event_compat event;
171         int retval = 0;
172
173         while (retval < count) {
174                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
175                         return -EFAULT;
176                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
177                 retval += sizeof(struct input_event_compat);
178         }
179
180         return retval;
181 }
182 #endif
183
184 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
185 {
186         struct evdev_list *list = file->private_data;
187         struct input_event event;
188         int retval = 0;
189
190         if (!list->evdev->exist) return -ENODEV;
191
192 #ifdef CONFIG_COMPAT
193         if (COMPAT_TEST)
194                 return evdev_write_compat(file, buffer, count, ppos);
195 #endif
196
197         while (retval < count) {
198
199                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
200                         return -EFAULT;
201                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
202                 retval += sizeof(struct input_event);
203         }
204
205         return retval;
206 }
207
208 #ifdef CONFIG_COMPAT
209 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
210 {
211         struct evdev_list *list = file->private_data;
212         int retval;
213
214         if (count < sizeof(struct input_event_compat))
215                 return -EINVAL;
216
217         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
218                 return -EAGAIN;
219
220         retval = wait_event_interruptible(list->evdev->wait,
221                 list->head != list->tail || (!list->evdev->exist));
222
223         if (retval)
224                 return retval;
225
226         if (!list->evdev->exist)
227                 return -ENODEV;
228
229         while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
230                 struct input_event *event = (struct input_event *) list->buffer + list->tail;
231                 struct input_event_compat event_compat;
232                 event_compat.time.tv_sec = event->time.tv_sec;
233                 event_compat.time.tv_usec = event->time.tv_usec;
234                 event_compat.type = event->type;
235                 event_compat.code = event->code;
236                 event_compat.value = event->value;
237
238                 if (copy_to_user(buffer + retval, &event_compat,
239                         sizeof(struct input_event_compat))) return -EFAULT;
240                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
241                 retval += sizeof(struct input_event_compat);
242         }
243
244         return retval;
245 }
246 #endif
247
248 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
249 {
250         struct evdev_list *list = file->private_data;
251         int retval;
252
253 #ifdef CONFIG_COMPAT
254         if (COMPAT_TEST)
255                 return evdev_read_compat(file, buffer, count, ppos);
256 #endif
257
258         if (count < sizeof(struct input_event))
259                 return -EINVAL;
260
261         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
262                 return -EAGAIN;
263
264         retval = wait_event_interruptible(list->evdev->wait,
265                 list->head != list->tail || (!list->evdev->exist));
266
267         if (retval)
268                 return retval;
269
270         if (!list->evdev->exist)
271                 return -ENODEV;
272
273         while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
274                 if (copy_to_user(buffer + retval, list->buffer + list->tail,
275                         sizeof(struct input_event))) return -EFAULT;
276                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
277                 retval += sizeof(struct input_event);
278         }
279
280         return retval;
281 }
282
283 /* No kernel lock - fine */
284 static unsigned int evdev_poll(struct file *file, poll_table *wait)
285 {
286         struct evdev_list *list = file->private_data;
287         poll_wait(file, &list->evdev->wait, wait);
288         return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
289                 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
290 }
291
292 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
293 {
294         struct evdev_list *list = file->private_data;
295         struct evdev *evdev = list->evdev;
296         struct input_dev *dev = evdev->handle.dev;
297         struct input_absinfo abs;
298         void __user *p = (void __user *)arg;
299         int __user *ip = (int __user *)arg;
300         int i, t, u, v;
301
302         if (!evdev->exist) return -ENODEV;
303
304         switch (cmd) {
305
306                 case EVIOCGVERSION:
307                         return put_user(EV_VERSION, ip);
308
309                 case EVIOCGID:
310                         return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
311
312                 case EVIOCGKEYCODE:
313                         if (get_user(t, ip)) return -EFAULT;
314                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
315                         if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
316                         return 0;
317
318                 case EVIOCSKEYCODE:
319                         if (get_user(t, ip)) return -EFAULT;
320                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
321                         if (get_user(v, ip + 1)) return -EFAULT;
322                         if (v < 0 || v > KEY_MAX) return -EINVAL;
323                         u = SET_INPUT_KEYCODE(dev, t, v);
324                         clear_bit(u, dev->keybit);
325                         set_bit(v, dev->keybit);
326                         for (i = 0; i < dev->keycodemax; i++)
327                                 if (INPUT_KEYCODE(dev,i) == u)
328                                         set_bit(u, dev->keybit);
329                         return 0;
330
331                 case EVIOCSFF:
332                         if (dev->upload_effect) {
333                                 struct ff_effect effect;
334                                 int err;
335
336                                 if (copy_from_user(&effect, p, sizeof(effect)))
337                                         return -EFAULT;
338                                 err = dev->upload_effect(dev, &effect);
339                                 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
340                                         return -EFAULT;
341                                 return err;
342                         }
343                         else return -ENOSYS;
344
345                 case EVIOCRMFF:
346                         if (dev->erase_effect) {
347                                 return dev->erase_effect(dev, (int)arg);
348                         }
349                         else return -ENOSYS;
350
351                 case EVIOCGEFFECTS:
352                         if (put_user(dev->ff_effects_max, ip))
353                                 return -EFAULT;
354                         return 0;
355
356                 case EVIOCGRAB:
357                         if (arg) {
358                                 if (evdev->grab)
359                                         return -EBUSY;
360                                 if (input_grab_device(&evdev->handle))
361                                         return -EBUSY;
362                                 evdev->grab = list;
363                                 return 0;
364                         } else {
365                                 if (evdev->grab != list)
366                                         return -EINVAL;
367                                 input_release_device(&evdev->handle);
368                                 evdev->grab = NULL;
369                                 return 0;
370                         }
371
372                 default:
373
374                         if (_IOC_TYPE(cmd) != 'E')
375                                 return -EINVAL;
376
377                         if (_IOC_DIR(cmd) == _IOC_READ) {
378
379                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
380
381                                         long *bits;
382                                         int len;
383
384                                         switch (_IOC_NR(cmd) & EV_MAX) {
385                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
386                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
387                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
388                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
389                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
390                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
391                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
392                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
393                                                 default: return -EINVAL;
394                                         }
395                                         len = NBITS(len) * sizeof(long);
396                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
397                                         return copy_to_user(p, bits, len) ? -EFAULT : len;
398                                 }
399
400                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
401                                         int len;
402                                         len = NBITS(KEY_MAX) * sizeof(long);
403                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
404                                         return copy_to_user(p, dev->key, len) ? -EFAULT : len;
405                                 }
406
407                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
408                                         int len;
409                                         len = NBITS(LED_MAX) * sizeof(long);
410                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
411                                         return copy_to_user(p, dev->led, len) ? -EFAULT : len;
412                                 }
413
414                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
415                                         int len;
416                                         len = NBITS(SND_MAX) * sizeof(long);
417                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
418                                         return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
419                                 }
420
421                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
422                                         int len;
423                                         if (!dev->name) return -ENOENT;
424                                         len = strlen(dev->name) + 1;
425                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
426                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
427                                 }
428
429                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
430                                         int len;
431                                         if (!dev->phys) return -ENOENT;
432                                         len = strlen(dev->phys) + 1;
433                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
434                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
435                                 }
436
437                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
438                                         int len;
439                                         if (!dev->uniq) return -ENOENT;
440                                         len = strlen(dev->uniq) + 1;
441                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
442                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
443                                 }
444
445                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
446
447                                         int t = _IOC_NR(cmd) & ABS_MAX;
448
449                                         abs.value = dev->abs[t];
450                                         abs.minimum = dev->absmin[t];
451                                         abs.maximum = dev->absmax[t];
452                                         abs.fuzz = dev->absfuzz[t];
453                                         abs.flat = dev->absflat[t];
454
455                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
456                                                 return -EFAULT;
457
458                                         return 0;
459                                 }
460
461                         }
462
463                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
464
465                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
466
467                                         int t = _IOC_NR(cmd) & ABS_MAX;
468
469                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
470                                                 return -EFAULT;
471
472                                         dev->abs[t] = abs.value;
473                                         dev->absmin[t] = abs.minimum;
474                                         dev->absmax[t] = abs.maximum;
475                                         dev->absfuzz[t] = abs.fuzz;
476                                         dev->absflat[t] = abs.flat;
477
478                                         return 0;
479                                 }
480                         }
481         }
482         return -EINVAL;
483 }
484
485 #ifdef CONFIG_COMPAT
486
487 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
488 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
489 #define OFF_COMPAT(x)  ((x)%BITS_PER_LONG_COMPAT)
490 #define BIT_COMPAT(x)  (1UL<<OFF_COMPAT(x))
491 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
492 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
493
494 #ifdef __BIG_ENDIAN
495 #define bit_to_user(bit, max) \
496 do { \
497         int i; \
498         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
499         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
500         for (i = 0; i < len / sizeof(compat_long_t); i++) \
501                 if (copy_to_user((compat_long_t*) p + i, \
502                                  (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
503                                  sizeof(compat_long_t))) \
504                         return -EFAULT; \
505         return len; \
506 } while (0)
507 #else
508 #define bit_to_user(bit, max) \
509 do { \
510         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
511         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
512         return copy_to_user(p, (bit), len) ? -EFAULT : len; \
513 } while (0)
514 #endif
515
516 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
517 {
518         struct evdev_list *list = file->private_data;
519         struct evdev *evdev = list->evdev;
520         struct input_dev *dev = evdev->handle.dev;
521         struct input_absinfo abs;
522         void __user *p = compat_ptr(arg);
523
524         if (!evdev->exist) return -ENODEV;
525
526         switch (cmd) {
527
528                 case EVIOCGVERSION:
529                 case EVIOCGID:
530                 case EVIOCGKEYCODE:
531                 case EVIOCSKEYCODE:
532                 case EVIOCSFF:
533                 case EVIOCRMFF:
534                 case EVIOCGEFFECTS:
535                 case EVIOCGRAB:
536                         return evdev_ioctl(file, cmd, (unsigned long) p);
537
538                 default:
539
540                         if (_IOC_TYPE(cmd) != 'E')
541                                 return -EINVAL;
542
543                         if (_IOC_DIR(cmd) == _IOC_READ) {
544
545                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
546                                         long *bits;
547                                         int max;
548
549                                         switch (_IOC_NR(cmd) & EV_MAX) {
550                                                 case      0: bits = dev->evbit;  max = EV_MAX;  break;
551                                                 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
552                                                 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
553                                                 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
554                                                 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
555                                                 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
556                                                 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
557                                                 case EV_FF:  bits = dev->ffbit;  max = FF_MAX;  break;
558                                                 default: return -EINVAL;
559                                         }
560                                         bit_to_user(bits, max);
561                                 }
562
563                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
564                                         bit_to_user(dev->key, KEY_MAX);
565
566                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
567                                         bit_to_user(dev->led, LED_MAX);
568
569                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
570                                         bit_to_user(dev->snd, SND_MAX);
571
572                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
573                                         int len;
574                                         if (!dev->name) return -ENOENT;
575                                         len = strlen(dev->name) + 1;
576                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
577                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
578                                 }
579
580                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
581                                         int len;
582                                         if (!dev->phys) return -ENOENT;
583                                         len = strlen(dev->phys) + 1;
584                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
585                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
586                                 }
587
588                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
589                                         int len;
590                                         if (!dev->uniq) return -ENOENT;
591                                         len = strlen(dev->uniq) + 1;
592                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
593                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
594                                 }
595
596                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
597
598                                         int t = _IOC_NR(cmd) & ABS_MAX;
599
600                                         abs.value = dev->abs[t];
601                                         abs.minimum = dev->absmin[t];
602                                         abs.maximum = dev->absmax[t];
603                                         abs.fuzz = dev->absfuzz[t];
604                                         abs.flat = dev->absflat[t];
605
606                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
607                                                 return -EFAULT;
608
609                                         return 0;
610                                 }
611                         }
612
613                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
614
615                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
616
617                                         int t = _IOC_NR(cmd) & ABS_MAX;
618
619                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
620                                                 return -EFAULT;
621
622                                         dev->abs[t] = abs.value;
623                                         dev->absmin[t] = abs.minimum;
624                                         dev->absmax[t] = abs.maximum;
625                                         dev->absfuzz[t] = abs.fuzz;
626                                         dev->absflat[t] = abs.flat;
627
628                                         return 0;
629                                 }
630                         }
631         }
632         return -EINVAL;
633 }
634 #endif
635
636 static struct file_operations evdev_fops = {
637         .owner =        THIS_MODULE,
638         .read =         evdev_read,
639         .write =        evdev_write,
640         .poll =         evdev_poll,
641         .open =         evdev_open,
642         .release =      evdev_release,
643         .unlocked_ioctl = evdev_ioctl,
644 #ifdef CONFIG_COMPAT
645         .compat_ioctl = evdev_ioctl_compat,
646 #endif
647         .fasync =       evdev_fasync,
648         .flush =        evdev_flush
649 };
650
651 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
652 {
653         struct evdev *evdev;
654         int minor;
655
656         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
657         if (minor == EVDEV_MINORS) {
658                 printk(KERN_ERR "evdev: no more free evdev devices\n");
659                 return NULL;
660         }
661
662         if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
663                 return NULL;
664         memset(evdev, 0, sizeof(struct evdev));
665
666         INIT_LIST_HEAD(&evdev->list);
667         init_waitqueue_head(&evdev->wait);
668
669         evdev->exist = 1;
670         evdev->minor = minor;
671         evdev->handle.dev = dev;
672         evdev->handle.name = evdev->name;
673         evdev->handle.handler = handler;
674         evdev->handle.private = evdev;
675         sprintf(evdev->name, "event%d", minor);
676
677         evdev_table[minor] = evdev;
678
679         devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
680                         S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
681         class_device_create(input_class,
682                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
683                         dev->dev, "event%d", minor);
684
685         return &evdev->handle;
686 }
687
688 static void evdev_disconnect(struct input_handle *handle)
689 {
690         struct evdev *evdev = handle->private;
691         struct evdev_list *list;
692
693         class_device_destroy(input_class,
694                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
695         devfs_remove("input/event%d", evdev->minor);
696         evdev->exist = 0;
697
698         if (evdev->open) {
699                 input_close_device(handle);
700                 wake_up_interruptible(&evdev->wait);
701                 list_for_each_entry(list, &evdev->list, node)
702                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
703         } else
704                 evdev_free(evdev);
705 }
706
707 static struct input_device_id evdev_ids[] = {
708         { .driver_info = 1 },   /* Matches all devices */
709         { },                    /* Terminating zero entry */
710 };
711
712 MODULE_DEVICE_TABLE(input, evdev_ids);
713
714 static struct input_handler evdev_handler = {
715         .event =        evdev_event,
716         .connect =      evdev_connect,
717         .disconnect =   evdev_disconnect,
718         .fops =         &evdev_fops,
719         .minor =        EVDEV_MINOR_BASE,
720         .name =         "evdev",
721         .id_table =     evdev_ids,
722 };
723
724 static int __init evdev_init(void)
725 {
726         input_register_handler(&evdev_handler);
727         return 0;
728 }
729
730 static void __exit evdev_exit(void)
731 {
732         input_unregister_handler(&evdev_handler);
733 }
734
735 module_init(evdev_init);
736 module_exit(evdev_exit);
737
738 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
739 MODULE_DESCRIPTION("Input driver event char devices");
740 MODULE_LICENSE("GPL");