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/device.h>
  22 #include <linux/compat.h>
  23
  24 struct evdev {
  25         int exist;
  26         int open;
  27         int minor;
  28         char name[16];
  29         struct input_handle handle;
  30         wait_queue_head_t wait;
  31         struct evdev_client *grab;
  32         struct list_head client_list;
  33 };
  34
  35 struct evdev_client {
  36         struct input_event buffer[EVDEV_BUFFER_SIZE];
  37         int head;
  38         int tail;
  39         struct fasync_struct *fasync;
  40         struct evdev *evdev;
  41         struct list_head node;
  42 };
  43
  44 static struct evdev *evdev_table[EVDEV_MINORS];
  45
  46 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  47 {
  48         struct evdev *evdev = handle->private;
  49         struct evdev_client *client;
  50
  51         if (evdev->grab) {
  52                 client = evdev->grab;
  53
  54                 do_gettimeofday(&client->buffer[client->head].time);
  55                 client->buffer[client->head].type = type;
  56                 client->buffer[client->head].code = code;
  57                 client->buffer[client->head].value = value;
  58                 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  59
  60                 kill_fasync(&client->fasync, SIGIO, POLL_IN);
  61         } else
  62                 list_for_each_entry(client, &evdev->client_list, node) {
  63
  64                         do_gettimeofday(&client->buffer[client->head].time);
  65                         client->buffer[client->head].type = type;
  66                         client->buffer[client->head].code = code;
  67                         client->buffer[client->head].value = value;
  68                         client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
  69
  70                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
  71                 }
  72
  73         wake_up_interruptible(&evdev->wait);
  74 }
  75
  76 static int evdev_fasync(int fd, struct file *file, int on)
  77 {
  78         struct evdev_client *client = file->private_data;
  79         int retval;
  80
  81         retval = fasync_helper(fd, file, on, &client->fasync);
  82
  83         return retval < 0 ? retval : 0;
  84 }
  85
  86 static int evdev_flush(struct file *file, fl_owner_t id)
  87 {
  88         struct evdev_client *client = file->private_data;
  89         struct evdev *evdev = client->evdev;
  90
  91         if (!evdev->exist)
  92                 return -ENODEV;
  93
  94         return input_flush_device(&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_client *client = file->private_data;
 106         struct evdev *evdev = client->evdev;
 107
 108         if (evdev->grab == client) {
 109                 input_release_device(&evdev->handle);
 110                 evdev->grab = NULL;
 111         }
 112
 113         evdev_fasync(-1, file, 0);
 114         list_del(&client->node);
 115         kfree(client);
 116
 117         if (!--evdev->open) {
 118                 if (evdev->exist)
 119                         input_close_device(&evdev->handle);
 120                 else
 121                         evdev_free(evdev);
 122         }
 123
 124         return 0;
 125 }
 126
 127 static int evdev_open(struct inode *inode, struct file *file)
 128 {
 129         struct evdev_client *client;
 130         struct evdev *evdev;
 131         int i = iminor(inode) - EVDEV_MINOR_BASE;
 132         int error;
 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                 error = input_open_device(&evdev->handle);
 151                 if (error) {
 152                         list_del(&client->node);
 153                         kfree(client);
 154                         return error;
 155                 }
 156         }
 157
 158         file->private_data = client;
 159         return 0;
 160 }
 161
 162 #ifdef CONFIG_COMPAT
 163
 164 struct input_event_compat {
 165         struct compat_timeval time;
 166         __u16 type;
 167         __u16 code;
 168         __s32 value;
 169 };
 170
 171 /* Note to the author of this code: did it ever occur to
 172    you why the ifdefs are needed? Think about it again. -AK */
 173 #ifdef CONFIG_X86_64
 174 #  define COMPAT_TEST is_compat_task()
 175 #elif defined(CONFIG_IA64)
 176 #  define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
 177 #elif defined(CONFIG_S390)
 178 #  define COMPAT_TEST test_thread_flag(TIF_31BIT)
 179 #elif defined(CONFIG_MIPS)
 180 #  define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
 181 #else
 182 #  define COMPAT_TEST test_thread_flag(TIF_32BIT)
 183 #endif
 184
 185 static inline size_t evdev_event_size(void)
 186 {
 187         return COMPAT_TEST ?
 188                 sizeof(struct input_event_compat) : sizeof(struct input_event);
 189 }
 190
 191 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
 192 {
 193         if (COMPAT_TEST) {
 194                 struct input_event_compat compat_event;
 195
 196                 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
 197                         return -EFAULT;
 198
 199                 event->time.tv_sec = compat_event.time.tv_sec;
 200                 event->time.tv_usec = compat_event.time.tv_usec;
 201                 event->type = compat_event.type;
 202                 event->code = compat_event.code;
 203                 event->value = compat_event.value;
 204
 205         } else {
 206                 if (copy_from_user(event, buffer, sizeof(struct input_event)))
 207                         return -EFAULT;
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
 214 {
 215         if (COMPAT_TEST) {
 216                 struct input_event_compat compat_event;
 217
 218                 compat_event.time.tv_sec = event->time.tv_sec;
 219                 compat_event.time.tv_usec = event->time.tv_usec;
 220                 compat_event.type = event->type;
 221                 compat_event.code = event->code;
 222                 compat_event.value = event->value;
 223
 224                 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
 225                         return -EFAULT;
 226
 227         } else {
 228                 if (copy_to_user(buffer, event, sizeof(struct input_event)))
 229                         return -EFAULT;
 230         }
 231
 232         return 0;
 233 }
 234
 235 #else
 236
 237 static inline size_t evdev_event_size(void)
 238 {
 239         return sizeof(struct input_event);
 240 }
 241
 242 static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
 243 {
 244         if (copy_from_user(event, buffer, sizeof(struct input_event)))
 245                 return -EFAULT;
 246
 247         return 0;
 248 }
 249
 250 static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
 251 {
 252         if (copy_to_user(buffer, event, sizeof(struct input_event)))
 253                 return -EFAULT;
 254
 255         return 0;
 256 }
 257
 258 #endif /* CONFIG_COMPAT */
 259
 260 static ssize_t evdev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 261 {
 262         struct evdev_client *client = file->private_data;
 263         struct evdev *evdev = client->evdev;
 264         struct input_event event;
 265         int retval = 0;
 266
 267         if (!evdev->exist)
 268                 return -ENODEV;
 269
 270         while (retval < count) {
 271
 272                 if (evdev_event_from_user(buffer + retval, &event))
 273                         return -EFAULT;
 274                 input_inject_event(&evdev->handle, event.type, event.code, event.value);
 275                 retval += evdev_event_size();
 276         }
 277
 278         return retval;
 279 }
 280
 281 static ssize_t evdev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 282 {
 283         struct evdev_client *client = file->private_data;
 284         struct evdev *evdev = client->evdev;
 285         int retval;
 286
 287         if (count < evdev_event_size())
 288                 return -EINVAL;
 289
 290         if (client->head == client->tail && evdev->exist && (file->f_flags & O_NONBLOCK))
 291                 return -EAGAIN;
 292
 293         retval = wait_event_interruptible(evdev->wait,
 294                 client->head != client->tail || !evdev->exist);
 295         if (retval)
 296                 return retval;
 297
 298         if (!evdev->exist)
 299                 return -ENODEV;
 300
 301         while (client->head != client->tail && retval + evdev_event_size() <= count) {
 302
 303                 struct input_event *event = (struct input_event *) client->buffer + client->tail;
 304
 305                 if (evdev_event_to_user(buffer + retval, event))
 306                         return -EFAULT;
 307
 308                 client->tail = (client->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
 309                 retval += evdev_event_size();
 310         }
 311
 312         return retval;
 313 }
 314
 315 /* No kernel lock - fine */
 316 static unsigned int evdev_poll(struct file *file, poll_table *wait)
 317 {
 318         struct evdev_client *client = file->private_data;
 319         struct evdev *evdev = client->evdev;
 320
 321         poll_wait(file, &evdev->wait, wait);
 322         return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
 323                 (evdev->exist ? 0 : (POLLHUP | POLLERR));
 324 }
 325
 326 #ifdef CONFIG_COMPAT
 327
 328 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
 329 #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
 330
 331 #ifdef __BIG_ENDIAN
 332 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
 333                         unsigned int maxlen, void __user *p, int compat)
 334 {
 335         int len, i;
 336
 337         if (compat) {
 338                 len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
 339                 if (len > maxlen)
 340                         len = maxlen;
 341
 342                 for (i = 0; i < len / sizeof(compat_long_t); i++)
 343                         if (copy_to_user((compat_long_t __user *) p + i,
 344                                          (compat_long_t *) bits +
 345                                                 i + 1 - ((i % 2) << 1),
 346                                          sizeof(compat_long_t)))
 347                                 return -EFAULT;
 348         } else {
 349                 len = NBITS(maxbit) * sizeof(long);
 350                 if (len > maxlen)
 351                         len = maxlen;
 352
 353                 if (copy_to_user(p, bits, len))
 354                         return -EFAULT;
 355         }
 356
 357         return len;
 358 }
 359 #else
 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 = compat ?
 364                         NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
 365                         NBITS(maxbit) * sizeof(long);
 366
 367         if (len > maxlen)
 368                 len = maxlen;
 369
 370         return copy_to_user(p, bits, len) ? -EFAULT : len;
 371 }
 372 #endif /* __BIG_ENDIAN */
 373
 374 #else
 375
 376 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
 377                         unsigned int maxlen, void __user *p, int compat)
 378 {
 379         int len = NBITS(maxbit) * sizeof(long);
 380
 381         if (len > maxlen)
 382                 len = maxlen;
 383
 384         return copy_to_user(p, bits, len) ? -EFAULT : len;
 385 }
 386
 387 #endif /* CONFIG_COMPAT */
 388
 389 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
 390 {
 391         int len;
 392
 393         if (!str)
 394                 return -ENOENT;
 395
 396         len = strlen(str) + 1;
 397         if (len > maxlen)
 398                 len = maxlen;
 399
 400         return copy_to_user(p, str, len) ? -EFAULT : len;
 401 }
 402
 403 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
 404                                 void __user *p, int compat_mode)
 405 {
 406         struct evdev_client *client = file->private_data;
 407         struct evdev *evdev = client->evdev;
 408         struct input_dev *dev = evdev->handle.dev;
 409         struct input_absinfo abs;
 410         struct ff_effect effect;
 411         int __user *ip = (int __user *)p;
 412         int i, t, u, v;
 413         int error;
 414
 415         if (!evdev->exist)
 416                 return -ENODEV;
 417
 418         switch (cmd) {
 419
 420                 case EVIOCGVERSION:
 421                         return put_user(EV_VERSION, ip);
 422
 423                 case EVIOCGID:
 424                         if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
 425                                 return -EFAULT;
 426                         return 0;
 427
 428                 case EVIOCGREP:
 429                         if (!test_bit(EV_REP, dev->evbit))
 430                                 return -ENOSYS;
 431                         if (put_user(dev->rep[REP_DELAY], ip))
 432                                 return -EFAULT;
 433                         if (put_user(dev->rep[REP_PERIOD], ip + 1))
 434                                 return -EFAULT;
 435                         return 0;
 436
 437                 case EVIOCSREP:
 438                         if (!test_bit(EV_REP, dev->evbit))
 439                                 return -ENOSYS;
 440                         if (get_user(u, ip))
 441                                 return -EFAULT;
 442                         if (get_user(v, ip + 1))
 443                                 return -EFAULT;
 444
 445                         input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
 446                         input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
 447
 448                         return 0;
 449
 450                 case EVIOCGKEYCODE:
 451                         if (get_user(t, ip))
 452                                 return -EFAULT;
 453
 454                         error = dev->getkeycode(dev, t, &v);
 455                         if (error)
 456                                 return error;
 457
 458                         if (put_user(v, ip + 1))
 459                                 return -EFAULT;
 460
 461                         return 0;
 462
 463                 case EVIOCSKEYCODE:
 464                         if (get_user(t, ip) || get_user(v, ip + 1))
 465                                 return -EFAULT;
 466
 467                         return dev->setkeycode(dev, t, v);
 468
 469                 case EVIOCSFF:
 470                         if (copy_from_user(&effect, p, sizeof(effect)))
 471                                 return -EFAULT;
 472
 473                         error = input_ff_upload(dev, &effect, file);
 474
 475                         if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
 476                                 return -EFAULT;
 477
 478                         return error;
 479
 480                 case EVIOCRMFF:
 481                         return input_ff_erase(dev, (int)(unsigned long) p, file);
 482
 483                 case EVIOCGEFFECTS:
 484                         i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
 485                         if (put_user(i, ip))
 486                                 return -EFAULT;
 487                         return 0;
 488
 489                 case EVIOCGRAB:
 490                         if (p) {
 491                                 if (evdev->grab)
 492                                         return -EBUSY;
 493                                 if (input_grab_device(&evdev->handle))
 494                                         return -EBUSY;
 495                                 evdev->grab = client;
 496                                 return 0;
 497                         } else {
 498                                 if (evdev->grab != client)
 499                                         return -EINVAL;
 500                                 input_release_device(&evdev->handle);
 501                                 evdev->grab = NULL;
 502                                 return 0;
 503                         }
 504
 505                 default:
 506
 507                         if (_IOC_TYPE(cmd) != 'E')
 508                                 return -EINVAL;
 509
 510                         if (_IOC_DIR(cmd) == _IOC_READ) {
 511
 512                                 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
 513
 514                                         unsigned long *bits;
 515                                         int len;
 516
 517                                         switch (_IOC_NR(cmd) & EV_MAX) {
 518                                                 case      0: bits = dev->evbit;  len = EV_MAX;  break;
 519                                                 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
 520                                                 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
 521                                                 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
 522                                                 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
 523                                                 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
 524                                                 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
 525                                                 case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
 526                                                 case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
 527                                                 default: return -EINVAL;
 528                                         }
 529                                         return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
 530                                 }
 531
 532                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
 533                                         return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
 534                                                             p, compat_mode);
 535
 536                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
 537                                         return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
 538                                                             p, compat_mode);
 539
 540                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
 541                                         return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
 542                                                             p, compat_mode);
 543
 544                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
 545                                         return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
 546                                                             p, compat_mode);
 547
 548                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
 549                                         return str_to_user(dev->name, _IOC_SIZE(cmd), p);
 550
 551                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
 552                                         return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
 553
 554                                 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
 555                                         return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
 556
 557                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 558
 559                                         t = _IOC_NR(cmd) & ABS_MAX;
 560
 561                                         abs.value = dev->abs[t];
 562                                         abs.minimum = dev->absmin[t];
 563                                         abs.maximum = dev->absmax[t];
 564                                         abs.fuzz = dev->absfuzz[t];
 565                                         abs.flat = dev->absflat[t];
 566
 567                                         if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
 568                                                 return -EFAULT;
 569
 570                                         return 0;
 571                                 }
 572
 573                         }
 574
 575                         if (_IOC_DIR(cmd) == _IOC_WRITE) {
 576
 577                                 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
 578
 579                                         t = _IOC_NR(cmd) & ABS_MAX;
 580
 581                                         if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
 582                                                 return -EFAULT;
 583
 584                                         dev->abs[t] = abs.value;
 585                                         dev->absmin[t] = abs.minimum;
 586                                         dev->absmax[t] = abs.maximum;
 587                                         dev->absfuzz[t] = abs.fuzz;
 588                                         dev->absflat[t] = abs.flat;
 589
 590                                         return 0;
 591                                 }
 592                         }
 593         }
 594         return -EINVAL;
 595 }
 596
 597 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 598 {
 599         return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
 600 }
 601
 602 #ifdef CONFIG_COMPAT
 603 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 604 {
 605         return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
 606 }
 607 #endif
 608
 609 static const struct file_operations evdev_fops = {
 610         .owner =        THIS_MODULE,
 611         .read =         evdev_read,
 612         .write =        evdev_write,
 613         .poll =         evdev_poll,
 614         .open =         evdev_open,
 615         .release =      evdev_release,
 616         .unlocked_ioctl = evdev_ioctl,
 617 #ifdef CONFIG_COMPAT
 618         .compat_ioctl = evdev_ioctl_compat,
 619 #endif
 620         .fasync =       evdev_fasync,
 621         .flush =        evdev_flush
 622 };
 623
 624 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
 625                          const struct input_device_id *id)
 626 {
 627         struct evdev *evdev;
 628         struct class_device *cdev;
 629         dev_t devt;
 630         int minor;
 631         int error;
 632
 633         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
 634         if (minor == EVDEV_MINORS) {
 635                 printk(KERN_ERR "evdev: no more free evdev devices\n");
 636                 return -ENFILE;
 637         }
 638
 639         evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
 640         if (!evdev)
 641                 return -ENOMEM;
 642
 643         INIT_LIST_HEAD(&evdev->client_list);
 644         init_waitqueue_head(&evdev->wait);
 645
 646         evdev->exist = 1;
 647         evdev->minor = minor;
 648         evdev->handle.dev = dev;
 649         evdev->handle.name = evdev->name;
 650         evdev->handle.handler = handler;
 651         evdev->handle.private = evdev;
 652         sprintf(evdev->name, "event%d", minor);
 653
 654         evdev_table[minor] = evdev;
 655
 656         devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
 657
 658         cdev = class_device_create(&input_class, &dev->cdev, devt,
 659                                    dev->cdev.dev, evdev->name);
 660         if (IS_ERR(cdev)) {
 661                 error = PTR_ERR(cdev);
 662                 goto err_free_evdev;
 663         }
 664
 665         /* temporary symlink to keep userspace happy */
 666         error = sysfs_create_link(&input_class.subsys.kobj,
 667                                   &cdev->kobj, evdev->name);
 668         if (error)
 669                 goto err_cdev_destroy;
 670
 671         error = input_register_handle(&evdev->handle);
 672         if (error)
 673                 goto err_remove_link;
 674
 675         return 0;
 676
 677  err_remove_link:
 678         sysfs_remove_link(&input_class.subsys.kobj, evdev->name);
 679  err_cdev_destroy:
 680         class_device_destroy(&input_class, devt);
 681  err_free_evdev:
 682         kfree(evdev);
 683         evdev_table[minor] = NULL;
 684         return error;
 685 }
 686
 687 static void evdev_disconnect(struct input_handle *handle)
 688 {
 689         struct evdev *evdev = handle->private;
 690         struct evdev_client *client;
 691
 692         input_unregister_handle(handle);
 693
 694         sysfs_remove_link(&input_class.subsys.kobj, evdev->name);
 695         class_device_destroy(&input_class,
 696                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
 697         evdev->exist = 0;
 698
 699         if (evdev->open) {
 700                 input_flush_device(handle, NULL);
 701                 input_close_device(handle);
 702                 list_for_each_entry(client, &evdev->client_list, node)
 703                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 704                 wake_up_interruptible(&evdev->wait);
 705         } else
 706                 evdev_free(evdev);
 707 }
 708
 709 static const struct input_device_id evdev_ids[] = {
 710         { .driver_info = 1 },   /* Matches all devices */
 711         { },                    /* Terminating zero entry */
 712 };
 713
 714 MODULE_DEVICE_TABLE(input, evdev_ids);
 715
 716 static struct input_handler evdev_handler = {
 717         .event =        evdev_event,
 718         .connect =      evdev_connect,
 719         .disconnect =   evdev_disconnect,
 720         .fops =         &evdev_fops,
 721         .minor =        EVDEV_MINOR_BASE,
 722         .name =         "evdev",
 723         .id_table =     evdev_ids,
 724 };
 725
 726 static int __init evdev_init(void)
 727 {
 728         return input_register_handler(&evdev_handler);
 729 }
 730
 731 static void __exit evdev_exit(void)
 732 {
 733         input_unregister_handler(&evdev_handler);
 734 }
 735
 736 module_init(evdev_init);
 737 module_exit(evdev_exit);
 738
 739 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 740 MODULE_DESCRIPTION("Input driver event char devices");
 741 MODULE_LICENSE("GPL");