Manual merge with Linus
[linux-2.6.git] / 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 #elif defined(CONFIG_MIPS)
164 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
165 #else
166 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
167 #endif
168
169 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
170 {
171         struct evdev_list *list = file->private_data;
172         struct input_event_compat event;
173         int retval = 0;
174
175         while (retval < count) {
176                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
177                         return -EFAULT;
178                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
179                 retval += sizeof(struct input_event_compat);
180         }
181
182         return retval;
183 }
184 #endif
185
186 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
187 {
188         struct evdev_list *list = file->private_data;
189         struct input_event event;
190         int retval = 0;
191
192         if (!list->evdev->exist) return -ENODEV;
193
194 #ifdef CONFIG_COMPAT
195         if (COMPAT_TEST)
196                 return evdev_write_compat(file, buffer, count, ppos);
197 #endif
198
199         while (retval < count) {
200
201                 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
202                         return -EFAULT;
203                 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
204                 retval += sizeof(struct input_event);
205         }
206
207         return retval;
208 }
209
210 #ifdef CONFIG_COMPAT
211 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
212 {
213         struct evdev_list *list = file->private_data;
214         int retval;
215
216         if (count < sizeof(struct input_event_compat))
217                 return -EINVAL;
218
219         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
220                 return -EAGAIN;
221
222         retval = wait_event_interruptible(list->evdev->wait,
223                 list->head != list->tail || (!list->evdev->exist));
224
225         if (retval)
226                 return retval;
227
228         if (!list->evdev->exist)
229                 return -ENODEV;
230
231         while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
232                 struct input_event *event = (struct input_event *) list->buffer + list->tail;
233                 struct input_event_compat event_compat;
234                 event_compat.time.tv_sec = event->time.tv_sec;
235                 event_compat.time.tv_usec = event->time.tv_usec;
236                 event_compat.type = event->type;
237                 event_compat.code = event->code;
238                 event_compat.value = event->value;
239
240                 if (copy_to_user(buffer + retval, &event_compat,
241                         sizeof(struct input_event_compat))) return -EFAULT;
242                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
243                 retval += sizeof(struct input_event_compat);
244         }
245
246         return retval;
247 }
248 #endif
249
250 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
251 {
252         struct evdev_list *list = file->private_data;
253         int retval;
254
255 #ifdef CONFIG_COMPAT
256         if (COMPAT_TEST)
257                 return evdev_read_compat(file, buffer, count, ppos);
258 #endif
259
260         if (count < sizeof(struct input_event))
261                 return -EINVAL;
262
263         if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
264                 return -EAGAIN;
265
266         retval = wait_event_interruptible(list->evdev->wait,
267                 list->head != list->tail || (!list->evdev->exist));
268
269         if (retval)
270                 return retval;
271
272         if (!list->evdev->exist)
273                 return -ENODEV;
274
275         while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
276                 if (copy_to_user(buffer + retval, list->buffer + list->tail,
277                         sizeof(struct input_event))) return -EFAULT;
278                 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
279                 retval += sizeof(struct input_event);
280         }
281
282         return retval;
283 }
284
285 /* No kernel lock - fine */
286 static unsigned int evdev_poll(struct file *file, poll_table *wait)
287 {
288         struct evdev_list *list = file->private_data;
289         poll_wait(file, &list->evdev->wait, wait);
290         return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
291                 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
292 }
293
294 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
295 {
296         struct evdev_list *list = file->private_data;
297         struct evdev *evdev = list->evdev;
298         struct input_dev *dev = evdev->handle.dev;
299         struct input_absinfo abs;
300         void __user *p = (void __user *)arg;
301         int __user *ip = (int __user *)arg;
302         int i, t, u, v;
303
304         if (!evdev->exist) return -ENODEV;
305
306         switch (cmd) {
307
308                 case EVIOCGVERSION:
309                         return put_user(EV_VERSION, ip);
310
311                 case EVIOCGID:
312                         return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
313
314                 case EVIOCGKEYCODE:
315                         if (get_user(t, ip)) return -EFAULT;
316                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
317                         if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
318                         return 0;
319
320                 case EVIOCSKEYCODE:
321                         if (get_user(t, ip)) return -EFAULT;
322                         if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
323                         if (get_user(v, ip + 1)) return -EFAULT;
324                         if (v < 0 || v > KEY_MAX) return -EINVAL;
325                         if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL;
326                         u = SET_INPUT_KEYCODE(dev, t, v);
327                         clear_bit(u, dev->keybit);
328                         set_bit(v, dev->keybit);
329                         for (i = 0; i < dev->keycodemax; i++)
330                                 if (INPUT_KEYCODE(dev,i) == u)
331                                         set_bit(u, dev->keybit);
332                         return 0;
333
334                 case EVIOCSFF:
335                         if (dev->upload_effect) {
336                                 struct ff_effect effect;
337                                 int err;
338
339                                 if (copy_from_user(&effect, p, sizeof(effect)))
340                                         return -EFAULT;
341                                 err = dev->upload_effect(dev, &effect);
342                                 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
343                                         return -EFAULT;
344                                 return err;
345                         }
346                         else return -ENOSYS;
347
348                 case EVIOCRMFF:
349                         if (dev->erase_effect) {
350                                 return dev->erase_effect(dev, (int)arg);
351                         }
352                         else return -ENOSYS;
353
354                 case EVIOCGEFFECTS:
355                         if (put_user(dev->ff_effects_max, ip))
356                                 return -EFAULT;
357                         return 0;
358
359                 case EVIOCGRAB:
360                         if (arg) {
361                                 if (evdev->grab)
362                                         return -EBUSY;
363                                 if (input_grab_device(&evdev->handle))
364                                         return -EBUSY;
365                                 evdev->grab = list;
366                                 return 0;
367                         } else {
368                                 if (evdev->grab != list)
369                                         return -EINVAL;
370                                 input_release_device(&evdev->handle);
371                                 evdev->grab = NULL;
372                                 return 0;
373                         }
374
375                 default:
376
377                         if (_IOC_TYPE(cmd) != 'E')
378                                 return -EINVAL;
379
380                         if (_IOC_DIR(cmd) == _IOC_READ) {
381
382                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
383
384                                         long *bits;
385                                         int len;
386
387                                         switch (_IOC_NR(cmd) & EV_MAX) {
388                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
389                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
390                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
391                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
392                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
393                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
394                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
395                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
396                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
397                                                 default: return -EINVAL;
398                                         }
399                                         len = NBITS(len) * sizeof(long);
400                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
401                                         return copy_to_user(p, bits, len) ? -EFAULT : len;
402                                 }
403
404                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
405                                         int len;
406                                         len = NBITS(KEY_MAX) * sizeof(long);
407                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
408                                         return copy_to_user(p, dev->key, len) ? -EFAULT : len;
409                                 }
410
411                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
412                                         int len;
413                                         len = NBITS(LED_MAX) * sizeof(long);
414                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
415                                         return copy_to_user(p, dev->led, len) ? -EFAULT : len;
416                                 }
417
418                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
419                                         int len;
420                                         len = NBITS(SND_MAX) * sizeof(long);
421                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
422                                         return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
423                                 }
424
425                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) {
426                                         int len;
427                                         len = NBITS(SW_MAX) * sizeof(long);
428                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
429                                         return copy_to_user(p, dev->sw, len) ? -EFAULT : len;
430                                 }
431
432                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
433                                         int len;
434                                         if (!dev->name) return -ENOENT;
435                                         len = strlen(dev->name) + 1;
436                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
437                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
438                                 }
439
440                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
441                                         int len;
442                                         if (!dev->phys) return -ENOENT;
443                                         len = strlen(dev->phys) + 1;
444                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
445                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
446                                 }
447
448                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
449                                         int len;
450                                         if (!dev->uniq) return -ENOENT;
451                                         len = strlen(dev->uniq) + 1;
452                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
453                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
454                                 }
455
456                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
457
458                                         int t = _IOC_NR(cmd) & ABS_MAX;
459
460                                         abs.value = dev->abs[t];
461                                         abs.minimum = dev->absmin[t];
462                                         abs.maximum = dev->absmax[t];
463                                         abs.fuzz = dev->absfuzz[t];
464                                         abs.flat = dev->absflat[t];
465
466                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
467                                                 return -EFAULT;
468
469                                         return 0;
470                                 }
471
472                         }
473
474                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
475
476                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
477
478                                         int t = _IOC_NR(cmd) & ABS_MAX;
479
480                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
481                                                 return -EFAULT;
482
483                                         dev->abs[t] = abs.value;
484                                         dev->absmin[t] = abs.minimum;
485                                         dev->absmax[t] = abs.maximum;
486                                         dev->absfuzz[t] = abs.fuzz;
487                                         dev->absflat[t] = abs.flat;
488
489                                         return 0;
490                                 }
491                         }
492         }
493         return -EINVAL;
494 }
495
496 #ifdef CONFIG_COMPAT
497
498 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
499 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
500 #define OFF_COMPAT(x)  ((x)%BITS_PER_LONG_COMPAT)
501 #define BIT_COMPAT(x)  (1UL<<OFF_COMPAT(x))
502 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
503 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
504
505 #ifdef __BIG_ENDIAN
506 #define bit_to_user(bit, max) \
507 do { \
508         int i; \
509         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
510         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
511         for (i = 0; i < len / sizeof(compat_long_t); i++) \
512                 if (copy_to_user((compat_long_t __user *) p + i, \
513                                  (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
514                                  sizeof(compat_long_t))) \
515                         return -EFAULT; \
516         return len; \
517 } while (0)
518 #else
519 #define bit_to_user(bit, max) \
520 do { \
521         int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
522         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
523         return copy_to_user(p, (bit), len) ? -EFAULT : len; \
524 } while (0)
525 #endif
526
527 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
528 {
529         struct evdev_list *list = file->private_data;
530         struct evdev *evdev = list->evdev;
531         struct input_dev *dev = evdev->handle.dev;
532         struct input_absinfo abs;
533         void __user *p = compat_ptr(arg);
534
535         if (!evdev->exist) return -ENODEV;
536
537         switch (cmd) {
538
539                 case EVIOCGVERSION:
540                 case EVIOCGID:
541                 case EVIOCGKEYCODE:
542                 case EVIOCSKEYCODE:
543                 case EVIOCSFF:
544                 case EVIOCRMFF:
545                 case EVIOCGEFFECTS:
546                 case EVIOCGRAB:
547                         return evdev_ioctl(file, cmd, (unsigned long) p);
548
549                 default:
550
551                         if (_IOC_TYPE(cmd) != 'E')
552                                 return -EINVAL;
553
554                         if (_IOC_DIR(cmd) == _IOC_READ) {
555
556                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
557                                         long *bits;
558                                         int max;
559
560                                         switch (_IOC_NR(cmd) & EV_MAX) {
561                                                 case      0: bits = dev->evbit;  max = EV_MAX;  break;
562                                                 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
563                                                 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
564                                                 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
565                                                 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
566                                                 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
567                                                 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
568                                                 case EV_FF:  bits = dev->ffbit;  max = FF_MAX;  break;
569                                                 default: return -EINVAL;
570                                         }
571                                         bit_to_user(bits, max);
572                                 }
573
574                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
575                                         bit_to_user(dev->key, KEY_MAX);
576
577                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
578                                         bit_to_user(dev->led, LED_MAX);
579
580                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
581                                         bit_to_user(dev->snd, SND_MAX);
582
583                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
584                                         int len;
585                                         if (!dev->name) return -ENOENT;
586                                         len = strlen(dev->name) + 1;
587                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
588                                         return copy_to_user(p, dev->name, len) ? -EFAULT : len;
589                                 }
590
591                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
592                                         int len;
593                                         if (!dev->phys) return -ENOENT;
594                                         len = strlen(dev->phys) + 1;
595                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
596                                         return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
597                                 }
598
599                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
600                                         int len;
601                                         if (!dev->uniq) return -ENOENT;
602                                         len = strlen(dev->uniq) + 1;
603                                         if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
604                                         return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
605                                 }
606
607                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
608
609                                         int t = _IOC_NR(cmd) & ABS_MAX;
610
611                                         abs.value = dev->abs[t];
612                                         abs.minimum = dev->absmin[t];
613                                         abs.maximum = dev->absmax[t];
614                                         abs.fuzz = dev->absfuzz[t];
615                                         abs.flat = dev->absflat[t];
616
617                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
618                                                 return -EFAULT;
619
620                                         return 0;
621                                 }
622                         }
623
624                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
625
626                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
627
628                                         int t = _IOC_NR(cmd) & ABS_MAX;
629
630                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
631                                                 return -EFAULT;
632
633                                         dev->abs[t] = abs.value;
634                                         dev->absmin[t] = abs.minimum;
635                                         dev->absmax[t] = abs.maximum;
636                                         dev->absfuzz[t] = abs.fuzz;
637                                         dev->absflat[t] = abs.flat;
638
639                                         return 0;
640                                 }
641                         }
642         }
643         return -EINVAL;
644 }
645 #endif
646
647 static struct file_operations evdev_fops = {
648         .owner =        THIS_MODULE,
649         .read =         evdev_read,
650         .write =        evdev_write,
651         .poll =         evdev_poll,
652         .open =         evdev_open,
653         .release =      evdev_release,
654         .unlocked_ioctl = evdev_ioctl,
655 #ifdef CONFIG_COMPAT
656         .compat_ioctl = evdev_ioctl_compat,
657 #endif
658         .fasync =       evdev_fasync,
659         .flush =        evdev_flush
660 };
661
662 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
663 {
664         struct evdev *evdev;
665         int minor;
666
667         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
668         if (minor == EVDEV_MINORS) {
669                 printk(KERN_ERR "evdev: no more free evdev devices\n");
670                 return NULL;
671         }
672
673         if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
674                 return NULL;
675         memset(evdev, 0, sizeof(struct evdev));
676
677         INIT_LIST_HEAD(&evdev->list);
678         init_waitqueue_head(&evdev->wait);
679
680         evdev->exist = 1;
681         evdev->minor = minor;
682         evdev->handle.dev = dev;
683         evdev->handle.name = evdev->name;
684         evdev->handle.handler = handler;
685         evdev->handle.private = evdev;
686         sprintf(evdev->name, "event%d", minor);
687
688         evdev_table[minor] = evdev;
689
690         devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
691                         S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
692         class_device_create(input_class,
693                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
694                         dev->dev, "event%d", minor);
695
696         return &evdev->handle;
697 }
698
699 static void evdev_disconnect(struct input_handle *handle)
700 {
701         struct evdev *evdev = handle->private;
702         struct evdev_list *list;
703
704         class_device_destroy(input_class,
705                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
706         devfs_remove("input/event%d", evdev->minor);
707         evdev->exist = 0;
708
709         if (evdev->open) {
710                 input_close_device(handle);
711                 wake_up_interruptible(&evdev->wait);
712                 list_for_each_entry(list, &evdev->list, node)
713                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
714         } else
715                 evdev_free(evdev);
716 }
717
718 static struct input_device_id evdev_ids[] = {
719         { .driver_info = 1 },   /* Matches all devices */
720         { },                    /* Terminating zero entry */
721 };
722
723 MODULE_DEVICE_TABLE(input, evdev_ids);
724
725 static struct input_handler evdev_handler = {
726         .event =        evdev_event,
727         .connect =      evdev_connect,
728         .disconnect =   evdev_disconnect,
729         .fops =         &evdev_fops,
730         .minor =        EVDEV_MINOR_BASE,
731         .name =         "evdev",
732         .id_table =     evdev_ids,
733 };
734
735 static int __init evdev_init(void)
736 {
737         input_register_handler(&evdev_handler);
738         return 0;
739 }
740
741 static void __exit evdev_exit(void)
742 {
743         input_unregister_handler(&evdev_handler);
744 }
745
746 module_init(evdev_init);
747 module_exit(evdev_exit);
748
749 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
750 MODULE_DESCRIPTION("Input driver event char devices");
751 MODULE_LICENSE("GPL");