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