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
  82         retval = fasync_helper(fd, file, on, &list->fasync);
  83
  84         return retval < 0 ? retval : 0;
  85 }
  86
  87 static 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
  97 static void evdev_free(struct evdev *evdev)
  98 {
  99         evdev_table[evdev->minor] = NULL;
 100         kfree(evdev);
 101 }
 102
 103 static 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
 126 static 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
 150 struct input_event_compat {
 151         struct compat_timeval time;
 152         __u16 type;
 153         __u16 code;
 154         __s32 value;
 155 };
 156
 157 /* Note to the author of this code: did it ever occur to
 158    you why the ifdefs are needed? Think about it again. -AK */
 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
 171 static inline size_t evdev_event_size(void)
 172 {
 173         return COMPAT_TEST ?
 174                 sizeof(struct input_event_compat) : sizeof(struct input_event);
 175 }
 176
 177 static 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
 199 static 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
 223 static inline size_t evdev_event_size(void)
 224 {
 225         return sizeof(struct input_event);
 226 }
 227
 228 static 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
 236 static 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 /* CONFIG_COMPAT */
 245
 246 static 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
 266 static 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 /* No kernel lock - fine */
 301 static 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
 316 static 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
 344 static 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 /* __BIG_ENDIAN */
 357
 358 #else
 359
 360 static 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 /* CONFIG_COMPAT */
 372
 373 static 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
 387 static 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         struct ff_effect effect;
 395         int __user *ip = (int __user *)p;
 396         int i, t, u, v;
 397         int error;
 398
 399         if (!evdev->exist)
 400                 return -ENODEV;
 401
 402         switch (cmd) {
 403
 404                 case EVIOCGVERSION:
 405                         return put_user(EV_VERSION, ip);
 406
 407                 case EVIOCGID:
 408                         if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
 409                                 return -EFAULT;
 410                         return 0;
 411
 412                 case EVIOCGREP:
 413                         if (!test_bit(EV_REP, dev->evbit))
 414                                 return -ENOSYS;
 415                         if (put_user(dev->rep[REP_DELAY], ip))
 416                                 return -EFAULT;
 417                         if (put_user(dev->rep[REP_PERIOD], ip + 1))
 418                                 return -EFAULT;
 419                         return 0;
 420
 421                 case EVIOCSREP:
 422                         if (!test_bit(EV_REP, dev->evbit))
 423                                 return -ENOSYS;
 424                         if (get_user(u, ip))
 425                                 return -EFAULT;
 426                         if (get_user(v, ip + 1))
 427                                 return -EFAULT;
 428
 429                         input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
 430                         input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
 431
 432                         return 0;
 433
 434                 case EVIOCGKEYCODE:
 435                         if (get_user(t, ip))
 436                                 return -EFAULT;
 437
 438                         error = dev->getkeycode(dev, t, &v);
 439                         if (error)
 440                                 return error;
 441
 442                         if (put_user(v, ip + 1))
 443                                 return -EFAULT;
 444
 445                         return 0;
 446
 447                 case EVIOCSKEYCODE:
 448                         if (get_user(t, ip) || get_user(v, ip + 1))
 449                                 return -EFAULT;
 450
 451                         return dev->setkeycode(dev, t, v);
 452
 453                 case EVIOCSFF:
 454                         if (copy_from_user(&effect, p, sizeof(effect)))
 455                                 return -EFAULT;
 456
 457                         error = input_ff_upload(dev, &effect, file);
 458
 459                         if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
 460                                 return -EFAULT;
 461
 462                         return error;
 463
 464                 case EVIOCRMFF:
 465                         return input_ff_erase(dev, (int)(unsigned long) p, file);
 466
 467                 case EVIOCGEFFECTS:
 468                         i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
 469                         if (put_user(i, ip))
 470                                 return -EFAULT;
 471                         return 0;
 472
 473                 case EVIOCGRAB:
 474                         if (p) {
 475                                 if (evdev->grab)
 476                                         return -EBUSY;
 477                                 if (input_grab_device(&evdev->handle))
 478                                         return -EBUSY;
 479                                 evdev->grab = list;
 480                                 return 0;
 481                         } else {
 482                                 if (evdev->grab != list)
 483                                         return -EINVAL;
 484                                 input_release_device(&evdev->handle);
 485                                 evdev->grab = NULL;
 486                                 return 0;
 487                         }
 488
 489                 default:
 490
 491                         if (_IOC_TYPE(cmd) != 'E')
 492                                 return -EINVAL;
 493
 494                         if (_IOC_DIR(cmd) == _IOC_READ) {
 495
 496                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 497
 498                                         long *bits;
 499                                         int len;
 500
 501                                         switch (_IOC_NR(cmd) & EV_MAX) {
 502                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
 503                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
 504                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
 505                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
 506                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
 507                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
 508                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
 509                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
 510                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
 511                                                 default: return -EINVAL;
 512                                         }
 513                                         return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
 514                                 }
 515
 516                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
 517                                         return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
 518                                                             p, compat_mode);
 519
 520                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
 521                                         return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
 522                                                             p, compat_mode);
 523
 524                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
 525                                         return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
 526                                                             p, compat_mode);
 527
 528                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
 529                                         return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
 530                                                             p, compat_mode);
 531
 532                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
 533                                         return str_to_user(dev->name, _IOC_SIZE(cmd), p);
 534
 535                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
 536                                         return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
 537
 538                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
 539                                         return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
 540
 541                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 542
 543                                         int t = _IOC_NR(cmd) & ABS_MAX;
 544
 545                                         abs.value = dev->abs[t];
 546                                         abs.minimum = dev->absmin[t];
 547                                         abs.maximum = dev->absmax[t];
 548                                         abs.fuzz = dev->absfuzz[t];
 549                                         abs.flat = dev->absflat[t];
 550
 551                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 552                                                 return -EFAULT;
 553
 554                                         return 0;
 555                                 }
 556
 557                         }
 558
 559                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 560
 561                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 562
 563                                         int t = _IOC_NR(cmd) & ABS_MAX;
 564
 565                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 566                                                 return -EFAULT;
 567
 568                                         dev->abs[t] = abs.value;
 569                                         dev->absmin[t] = abs.minimum;
 570                                         dev->absmax[t] = abs.maximum;
 571                                         dev->absfuzz[t] = abs.fuzz;
 572                                         dev->absflat[t] = abs.flat;
 573
 574                                         return 0;
 575                                 }
 576                         }
 577         }
 578         return -EINVAL;
 579 }
 580
 581 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 582 {
 583         return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
 584 }
 585
 586 #ifdef CONFIG_COMPAT
 587 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 588 {
 589         return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
 590 }
 591 #endif
 592
 593 static const struct file_operations evdev_fops = {
 594         .owner =        THIS_MODULE,
 595         .read =         evdev_read,
 596         .write =        evdev_write,
 597         .poll =         evdev_poll,
 598         .open =         evdev_open,
 599         .release =      evdev_release,
 600         .unlocked_ioctl = evdev_ioctl,
 601 #ifdef CONFIG_COMPAT
 602         .compat_ioctl = evdev_ioctl_compat,
 603 #endif
 604         .fasync =       evdev_fasync,
 605         .flush =        evdev_flush
 606 };
 607
 608 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
 609                          const struct input_device_id *id)
 610 {
 611         struct evdev *evdev;
 612         struct class_device *cdev;
 613         dev_t devt;
 614         int minor;
 615         int error;
 616
 617         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 618         if (minor == EVDEV_MINORS) {
 619                 printk(KERN_ERR "evdev: no more free evdev devices\n");
 620                 return -ENFILE;
 621         }
 622
 623         evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
 624         if (!evdev)
 625                 return -ENOMEM;
 626
 627         INIT_LIST_HEAD(&evdev->list);
 628         init_waitqueue_head(&evdev->wait);
 629
 630         evdev->exist = 1;
 631         evdev->minor = minor;
 632         evdev->handle.dev = dev;
 633         evdev->handle.name = evdev->name;
 634         evdev->handle.handler = handler;
 635         evdev->handle.private = evdev;
 636         sprintf(evdev->name, "event%d", minor);
 637
 638         evdev_table[minor] = evdev;
 639
 640         devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 641
 642         cdev = class_device_create(&input_class, &dev->cdev, devt,
 643                                    dev->cdev.dev, evdev->name);
 644         if (IS_ERR(cdev)) {
 645                 error = PTR_ERR(cdev);
 646                 goto err_free_evdev;
 647         }
 648
 649         /* temporary symlink to keep userspace happy */
 650         error = sysfs_create_link(&input_class.subsys.kset.kobj,
 651                                   &cdev->kobj, evdev->name);
 652         if (error)
 653                 goto err_cdev_destroy;
 654
 655         error = input_register_handle(&evdev->handle);
 656         if (error)
 657                 goto err_remove_link;
 658
 659         return 0;
 660
 661  err_remove_link:
 662         sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
 663  err_cdev_destroy:
 664         class_device_destroy(&input_class, devt);
 665  err_free_evdev:
 666         kfree(evdev);
 667         evdev_table[minor] = NULL;
 668         return error;
 669 }
 670
 671 static void evdev_disconnect(struct input_handle *handle)
 672 {
 673         struct evdev *evdev = handle->private;
 674         struct evdev_list *list;
 675
 676         input_unregister_handle(handle);
 677
 678         sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
 679         class_device_destroy(&input_class,
 680                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 681         evdev->exist = 0;
 682
 683         if (evdev->open) {
 684                 input_flush_device(handle, NULL);
 685                 input_close_device(handle);
 686                 wake_up_interruptible(&evdev->wait);
 687                 list_for_each_entry(list, &evdev->list, node)
 688                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 689         } else
 690                 evdev_free(evdev);
 691 }
 692
 693 static const struct input_device_id evdev_ids[] = {
 694         { .driver_info = 1 },   /* Matches all devices */
 695         { },                    /* Terminating zero entry */
 696 };
 697
 698 MODULE_DEVICE_TABLE(input, evdev_ids);
 699
 700 static struct input_handler evdev_handler = {
 701         .event =        evdev_event,
 702         .connect =      evdev_connect,
 703         .disconnect =   evdev_disconnect,
 704         .fops =         &evdev_fops,
 705         .minor =        EVDEV_MINOR_BASE,
 706         .name =         "evdev",
 707         .id_table =     evdev_ids,
 708 };
 709
 710 static int __init evdev_init(void)
 711 {
 712         return input_register_handler(&evdev_handler);
 713 }
 714
 715 static void __exit evdev_exit(void)
 716 {
 717         input_unregister_handler(&evdev_handler);
 718 }
 719
 720 module_init(evdev_init);
 721 module_exit(evdev_exit);
 722
 723 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 724 MODULE_DESCRIPTION("Input driver event char devices");
 725 MODULE_LICENSE("GPL");