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_client *grab;
  33         struct list_head client_list;
  34 };
  35
  36 struct evdev_client {
  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_client *client;
  51
  52         if (evdev->grab) {
  53                 client = evdev->grab;
  54
  55                 do_gettimeofday(&client->buffer[client->head].time);
  56                 client->buffer[client->head].type = type;
  57                 client->buffer[client->head].code = code;
  58                 client->buffer[client->head].value = value;
  59                 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  60
  61                 kill_fasync(&client->fasync, SIGIO, POLL_IN);
  62         } else
  63                 list_for_each_entry(client, &evdev->client_list, node) {
  64
  65                         do_gettimeofday(&client->buffer[client->head].time);
  66                         client->buffer[client->head].type = type;
  67                         client->buffer[client->head].code = code;
  68                         client->buffer[client->head].value = value;
  69                         client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  70
  71                         kill_fasync(&client->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         struct evdev_client *client = file->private_data;
  80         int retval;
  81
  82         retval = fasync_helper(fd, file, on, &client->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_client *client = file->private_data;
  90         struct evdev *evdev = client->evdev;
  91
  92         if (!evdev->exist)
  93                 return -ENODEV;
  94
  95         return input_flush_device(&evdev->handle, file);
  96 }
  97
  98 static void evdev_free(struct evdev *evdev)
  99 {
 100         evdev_table[evdev->minor] = NULL;
 101         kfree(evdev);
 102 }
 103
 104 static int evdev_release(struct inode *inode, struct file *file)
 105 {
 106         struct evdev_client *client = file->private_data;
 107         struct evdev *evdev = client->evdev;
 108
 109         if (evdev->grab == client) {
 110                 input_release_device(&evdev->handle);
 111                 evdev->grab = NULL;
 112         }
 113
 114         evdev_fasync(-1, file, 0);
 115         list_del(&client->node);
 116         kfree(client);
 117
 118         if (!--evdev->open) {
 119                 if (evdev->exist)
 120                         input_close_device(&evdev->handle);
 121                 else
 122                         evdev_free(evdev);
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int evdev_open(struct inode *inode, struct file *file)
 129 {
 130         struct evdev_client *client;
 131         struct evdev *evdev;
 132         int i = iminor(inode) - EVDEV_MINOR_BASE;
 133         int error;
 134
 135         if (i >= EVDEV_MINORS)
 136                 return -ENODEV;
 137
 138         evdev = evdev_table[i];
 139
 140         if (!evdev || !evdev->exist)
 141                 return -ENODEV;
 142
 143         client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
 144         if (!client)
 145                 return -ENOMEM;
 146
 147         client->evdev = evdev;
 148         list_add_tail(&client->node, &evdev->client_list);
 149
 150         if (!evdev->open++ && evdev->exist) {
 151                 error = input_open_device(&evdev->handle);
 152                 if (error) {
 153                         list_del(&client->node);
 154                         kfree(client);
 155                         return error;
 156                 }
 157         }
 158
 159         file->private_data = client;
 160         return 0;
 161 }
 162
 163 #ifdef CONFIG_COMPAT
 164
 165 struct input_event_compat {
 166         struct compat_timeval time;
 167         __u16 type;
 168         __u16 code;
 169         __s32 value;
 170 };
 171
 172 /* Note to the author of this code: did it ever occur to
 173    you why the ifdefs are needed? Think about it again. -AK */
 174 #ifdef CONFIG_X86_64
 175 #  define COMPAT_TEST is_compat_task()
 176 #elif defined(CONFIG_IA64)
 177 #  define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
 178 #elif defined(CONFIG_S390)
 179 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
 180 #elif defined(CONFIG_MIPS)
 181 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
 182 #else
 183 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
 184 #endif
 185
 186 static inline size_t evdev_event_size(void)
 187 {
 188         return COMPAT_TEST ?
 189                 sizeof(struct input_event_compat) : sizeof(struct input_event);
 190 }
 191
 192 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
 193 {
 194         if (COMPAT_TEST) {
 195                 struct input_event_compat compat_event;
 196
 197                 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
 198                         return -EFAULT;
 199
 200                 event->time.tv_sec = compat_event.time.tv_sec;
 201                 event->time.tv_usec = compat_event.time.tv_usec;
 202                 event->type = compat_event.type;
 203                 event->code = compat_event.code;
 204                 event->value = compat_event.value;
 205
 206         } else {
 207                 if (copy_from_user(event, buffer, sizeof(struct input_event)))
 208                         return -EFAULT;
 209         }
 210
 211         return 0;
 212 }
 213
 214 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
 215 {
 216         if (COMPAT_TEST) {
 217                 struct input_event_compat compat_event;
 218
 219                 compat_event.time.tv_sec = event->time.tv_sec;
 220                 compat_event.time.tv_usec = event->time.tv_usec;
 221                 compat_event.type = event->type;
 222                 compat_event.code = event->code;
 223                 compat_event.value = event->value;
 224
 225                 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
 226                         return -EFAULT;
 227
 228         } else {
 229                 if (copy_to_user(buffer, event, sizeof(struct input_event)))
 230                         return -EFAULT;
 231         }
 232
 233         return 0;
 234 }
 235
 236 #else
 237
 238 static inline size_t evdev_event_size(void)
 239 {
 240         return sizeof(struct input_event);
 241 }
 242
 243 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
 244 {
 245         if (copy_from_user(event, buffer, sizeof(struct input_event)))
 246                 return -EFAULT;
 247
 248         return 0;
 249 }
 250
 251 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
 252 {
 253         if (copy_to_user(buffer, event, sizeof(struct input_event)))
 254                 return -EFAULT;
 255
 256         return 0;
 257 }
 258
 259 #endif /* CONFIG_COMPAT */
 260
 261 static ssize_t evdev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 262 {
 263         struct evdev_client *client = file->private_data;
 264         struct evdev *evdev = client->evdev;
 265         struct input_event event;
 266         int retval = 0;
 267
 268         if (!evdev->exist)
 269                 return -ENODEV;
 270
 271         while (retval < count) {
 272
 273                 if (evdev_event_from_user(buffer + retval, &event))
 274                         return -EFAULT;
 275                 input_inject_event(&evdev->handle, event.type, event.code, event.value);
 276                 retval += evdev_event_size();
 277         }
 278
 279         return retval;
 280 }
 281
 282 static ssize_t evdev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 283 {
 284         struct evdev_client *client = file->private_data;
 285         struct evdev *evdev = client->evdev;
 286         int retval;
 287
 288         if (count < evdev_event_size())
 289                 return -EINVAL;
 290
 291         if (client->head == client->tail && evdev->exist && (file->f_flags & O_NONBLOCK))
 292                 return -EAGAIN;
 293
 294         retval = wait_event_interruptible(evdev->wait,
 295                 client->head != client->tail || !evdev->exist);
 296         if (retval)
 297                 return retval;
 298
 299         if (!evdev->exist)
 300                 return -ENODEV;
 301
 302         while (client->head != client->tail && retval + evdev_event_size() <= count) {
 303
 304                 struct input_event *event = (struct input_event *) client->buffer + client->tail;
 305
 306                 if (evdev_event_to_user(buffer + retval, event))
 307                         return -EFAULT;
 308
 309                 client->tail = (client->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 310                 retval += evdev_event_size();
 311         }
 312
 313         return retval;
 314 }
 315
 316 /* No kernel lock - fine */
 317 static unsigned int evdev_poll(struct file *file, poll_table *wait)
 318 {
 319         struct evdev_client *client = file->private_data;
 320         struct evdev *evdev = client->evdev;
 321
 322         poll_wait(file, &evdev->wait, wait);
 323         return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
 324                 (evdev->exist ? 0 : (POLLHUP | POLLERR));
 325 }
 326
 327 #ifdef CONFIG_COMPAT
 328
 329 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
 330 #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
 331
 332 #ifdef __BIG_ENDIAN
 333 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
 334                         unsigned int maxlen, void __user *p, int compat)
 335 {
 336         int len, i;
 337
 338         if (compat) {
 339                 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
 340                 if (len < maxlen)
 341                         len = maxlen;
 342
 343                 for (i = 0; i < len / sizeof(compat_long_t); i++)
 344                         if (copy_to_user((compat_long_t __user *) p + i,
 345                                          (compat_long_t *) bits +
 346                                                 i + 1 - ((i % 2) << 1),
 347                                          sizeof(compat_long_t)))
 348                                 return -EFAULT;
 349         } else {
 350                 len = NBITS(maxbit) * sizeof(long);
 351                 if (len > maxlen)
 352                         len = maxlen;
 353
 354                 if (copy_to_user(p, bits, len))
 355                         return -EFAULT;
 356         }
 357
 358         return len;
 359 }
 360 #else
 361 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
 362                         unsigned int maxlen, void __user *p, int compat)
 363 {
 364         int len = compat ?
 365                         NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
 366                         NBITS(maxbit) * sizeof(long);
 367
 368         if (len > maxlen)
 369                 len = maxlen;
 370
 371         return copy_to_user(p, bits, len) ? -EFAULT : len;
 372 }
 373 #endif /* __BIG_ENDIAN */
 374
 375 #else
 376
 377 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
 378                         unsigned int maxlen, void __user *p, int compat)
 379 {
 380         int len = NBITS(maxbit) * sizeof(long);
 381
 382         if (len > maxlen)
 383                 len = maxlen;
 384
 385         return copy_to_user(p, bits, len) ? -EFAULT : len;
 386 }
 387
 388 #endif /* CONFIG_COMPAT */
 389
 390 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
 391 {
 392         int len;
 393
 394         if (!str)
 395                 return -ENOENT;
 396
 397         len = strlen(str) + 1;
 398         if (len > maxlen)
 399                 len = maxlen;
 400
 401         return copy_to_user(p, str, len) ? -EFAULT : len;
 402 }
 403
 404 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
 405                                 void __user *p, int compat_mode)
 406 {
 407         struct evdev_client *client = file->private_data;
 408         struct evdev *evdev = client->evdev;
 409         struct input_dev *dev = evdev->handle.dev;
 410         struct input_absinfo abs;
 411         struct ff_effect effect;
 412         int __user *ip = (int __user *)p;
 413         int i, t, u, v;
 414         int error;
 415
 416         if (!evdev->exist)
 417                 return -ENODEV;
 418
 419         switch (cmd) {
 420
 421                 case EVIOCGVERSION:
 422                         return put_user(EV_VERSION, ip);
 423
 424                 case EVIOCGID:
 425                         if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
 426                                 return -EFAULT;
 427                         return 0;
 428
 429                 case EVIOCGREP:
 430                         if (!test_bit(EV_REP, dev->evbit))
 431                                 return -ENOSYS;
 432                         if (put_user(dev->rep[REP_DELAY], ip))
 433                                 return -EFAULT;
 434                         if (put_user(dev->rep[REP_PERIOD], ip + 1))
 435                                 return -EFAULT;
 436                         return 0;
 437
 438                 case EVIOCSREP:
 439                         if (!test_bit(EV_REP, dev->evbit))
 440                                 return -ENOSYS;
 441                         if (get_user(u, ip))
 442                                 return -EFAULT;
 443                         if (get_user(v, ip + 1))
 444                                 return -EFAULT;
 445
 446                         input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
 447                         input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
 448
 449                         return 0;
 450
 451                 case EVIOCGKEYCODE:
 452                         if (get_user(t, ip))
 453                                 return -EFAULT;
 454
 455                         error = dev->getkeycode(dev, t, &v);
 456                         if (error)
 457                                 return error;
 458
 459                         if (put_user(v, ip + 1))
 460                                 return -EFAULT;
 461
 462                         return 0;
 463
 464                 case EVIOCSKEYCODE:
 465                         if (get_user(t, ip) || get_user(v, ip + 1))
 466                                 return -EFAULT;
 467
 468                         return dev->setkeycode(dev, t, v);
 469
 470                 case EVIOCSFF:
 471                         if (copy_from_user(&effect, p, sizeof(effect)))
 472                                 return -EFAULT;
 473
 474                         error = input_ff_upload(dev, &effect, file);
 475
 476                         if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
 477                                 return -EFAULT;
 478
 479                         return error;
 480
 481                 case EVIOCRMFF:
 482                         return input_ff_erase(dev, (int)(unsigned long) p, file);
 483
 484                 case EVIOCGEFFECTS:
 485                         i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
 486                         if (put_user(i, ip))
 487                                 return -EFAULT;
 488                         return 0;
 489
 490                 case EVIOCGRAB:
 491                         if (p) {
 492                                 if (evdev->grab)
 493                                         return -EBUSY;
 494                                 if (input_grab_device(&evdev->handle))
 495                                         return -EBUSY;
 496                                 evdev->grab = client;
 497                                 return 0;
 498                         } else {
 499                                 if (evdev->grab != client)
 500                                         return -EINVAL;
 501                                 input_release_device(&evdev->handle);
 502                                 evdev->grab = NULL;
 503                                 return 0;
 504                         }
 505
 506                 default:
 507
 508                         if (_IOC_TYPE(cmd) != 'E')
 509                                 return -EINVAL;
 510
 511                         if (_IOC_DIR(cmd) == _IOC_READ) {
 512
 513                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 514
 515                                         long *bits;
 516                                         int len;
 517
 518                                         switch (_IOC_NR(cmd) & EV_MAX) {
 519                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
 520                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
 521                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
 522                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
 523                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
 524                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
 525                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
 526                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
 527                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
 528                                                 default: return -EINVAL;
 529                                         }
 530                                         return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
 531                                 }
 532
 533                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
 534                                         return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
 535                                                             p, compat_mode);
 536
 537                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
 538                                         return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
 539                                                             p, compat_mode);
 540
 541                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
 542                                         return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
 543                                                             p, compat_mode);
 544
 545                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
 546                                         return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
 547                                                             p, compat_mode);
 548
 549                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
 550                                         return str_to_user(dev->name, _IOC_SIZE(cmd), p);
 551
 552                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
 553                                         return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
 554
 555                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
 556                                         return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
 557
 558                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 559
 560                                         int t = _IOC_NR(cmd) & ABS_MAX;
 561
 562                                         abs.value = dev->abs[t];
 563                                         abs.minimum = dev->absmin[t];
 564                                         abs.maximum = dev->absmax[t];
 565                                         abs.fuzz = dev->absfuzz[t];
 566                                         abs.flat = dev->absflat[t];
 567
 568                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 569                                                 return -EFAULT;
 570
 571                                         return 0;
 572                                 }
 573
 574                         }
 575
 576                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 577
 578                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 579
 580                                         int t = _IOC_NR(cmd) & ABS_MAX;
 581
 582                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 583                                                 return -EFAULT;
 584
 585                                         dev->abs[t] = abs.value;
 586                                         dev->absmin[t] = abs.minimum;
 587                                         dev->absmax[t] = abs.maximum;
 588                                         dev->absfuzz[t] = abs.fuzz;
 589                                         dev->absflat[t] = abs.flat;
 590
 591                                         return 0;
 592                                 }
 593                         }
 594         }
 595         return -EINVAL;
 596 }
 597
 598 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 599 {
 600         return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
 601 }
 602
 603 #ifdef CONFIG_COMPAT
 604 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 605 {
 606         return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
 607 }
 608 #endif
 609
 610 static const struct file_operations evdev_fops = {
 611         .owner =        THIS_MODULE,
 612         .read =         evdev_read,
 613         .write =        evdev_write,
 614         .poll =         evdev_poll,
 615         .open =         evdev_open,
 616         .release =      evdev_release,
 617         .unlocked_ioctl = evdev_ioctl,
 618 #ifdef CONFIG_COMPAT
 619         .compat_ioctl = evdev_ioctl_compat,
 620 #endif
 621         .fasync =       evdev_fasync,
 622         .flush =        evdev_flush
 623 };
 624
 625 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
 626                          const struct input_device_id *id)
 627 {
 628         struct evdev *evdev;
 629         struct class_device *cdev;
 630         dev_t devt;
 631         int minor;
 632         int error;
 633
 634         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 635         if (minor == EVDEV_MINORS) {
 636                 printk(KERN_ERR "evdev: no more free evdev devices\n");
 637                 return -ENFILE;
 638         }
 639
 640         evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
 641         if (!evdev)
 642                 return -ENOMEM;
 643
 644         INIT_LIST_HEAD(&evdev->client_list);
 645         init_waitqueue_head(&evdev->wait);
 646
 647         evdev->exist = 1;
 648         evdev->minor = minor;
 649         evdev->handle.dev = dev;
 650         evdev->handle.name = evdev->name;
 651         evdev->handle.handler = handler;
 652         evdev->handle.private = evdev;
 653         sprintf(evdev->name, "event%d", minor);
 654
 655         evdev_table[minor] = evdev;
 656
 657         devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 658
 659         cdev = class_device_create(&input_class, &dev->cdev, devt,
 660                                    dev->cdev.dev, evdev->name);
 661         if (IS_ERR(cdev)) {
 662                 error = PTR_ERR(cdev);
 663                 goto err_free_evdev;
 664         }
 665
 666         /* temporary symlink to keep userspace happy */
 667         error = sysfs_create_link(&input_class.subsys.kobj,
 668                                   &cdev->kobj, evdev->name);
 669         if (error)
 670                 goto err_cdev_destroy;
 671
 672         error = input_register_handle(&evdev->handle);
 673         if (error)
 674                 goto err_remove_link;
 675
 676         return 0;
 677
 678  err_remove_link:
 679         sysfs_remove_link(&input_class.subsys.kobj, evdev->name);
 680  err_cdev_destroy:
 681         class_device_destroy(&input_class, devt);
 682  err_free_evdev:
 683         kfree(evdev);
 684         evdev_table[minor] = NULL;
 685         return error;
 686 }
 687
 688 static void evdev_disconnect(struct input_handle *handle)
 689 {
 690         struct evdev *evdev = handle->private;
 691         struct evdev_client *client;
 692
 693         input_unregister_handle(handle);
 694
 695         sysfs_remove_link(&input_class.subsys.kobj, evdev->name);
 696         class_device_destroy(&input_class,
 697                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 698         evdev->exist = 0;
 699
 700         if (evdev->open) {
 701                 input_flush_device(handle, NULL);
 702                 input_close_device(handle);
 703                 wake_up_interruptible(&evdev->wait);
 704                 list_for_each_entry(client, &evdev->client_list, node)
 705                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 706         } else
 707                 evdev_free(evdev);
 708 }
 709
 710 static const struct input_device_id evdev_ids[] = {
 711         { .driver_info = 1 },   /* Matches all devices */
 712         { },                    /* Terminating zero entry */
 713 };
 714
 715 MODULE_DEVICE_TABLE(input, evdev_ids);
 716
 717 static struct input_handler evdev_handler = {
 718         .event =        evdev_event,
 719         .connect =      evdev_connect,
 720         .disconnect =   evdev_disconnect,
 721         .fops =         &evdev_fops,
 722         .minor =        EVDEV_MINOR_BASE,
 723         .name =         "evdev",
 724         .id_table =     evdev_ids,
 725 };
 726
 727 static int __init evdev_init(void)
 728 {
 729         return input_register_handler(&evdev_handler);
 730 }
 731
 732 static void __exit evdev_exit(void)
 733 {
 734         input_unregister_handler(&evdev_handler);
 735 }
 736
 737 module_init(evdev_init);
 738 module_exit(evdev_exit);
 739
 740 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 741 MODULE_DESCRIPTION("Input driver event char devices");
 742 MODULE_LICENSE("GPL");