drivers/input/input.c

   1 /*
   2  * The input core
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/sched.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/input.h>
  17 #include <linux/module.h>
  18 #include <linux/random.h>
  19 #include <linux/major.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/kobject_uevent.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/poll.h>
  24 #include <linux/device.h>
  25 #include <linux/devfs_fs_kernel.h>
  26
  27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  28 MODULE_DESCRIPTION("Input core");
  29 MODULE_LICENSE("GPL");
  30
  31 EXPORT_SYMBOL(input_register_device);
  32 EXPORT_SYMBOL(input_unregister_device);
  33 EXPORT_SYMBOL(input_register_handler);
  34 EXPORT_SYMBOL(input_unregister_handler);
  35 EXPORT_SYMBOL(input_grab_device);
  36 EXPORT_SYMBOL(input_release_device);
  37 EXPORT_SYMBOL(input_open_device);
  38 EXPORT_SYMBOL(input_close_device);
  39 EXPORT_SYMBOL(input_accept_process);
  40 EXPORT_SYMBOL(input_flush_device);
  41 EXPORT_SYMBOL(input_event);
  42 EXPORT_SYMBOL(input_class);
  43
  44 #define INPUT_DEVICES   256
  45
  46 static LIST_HEAD(input_dev_list);
  47 static LIST_HEAD(input_handler_list);
  48
  49 static struct input_handler *input_table[8];
  50
  51 #ifdef CONFIG_PROC_FS
  52 static struct proc_dir_entry *proc_bus_input_dir;
  53 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
  54 static int input_devices_state;
  55 #endif
  56
  57 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  58 {
  59         struct input_handle *handle;
  60
  61         if (type > EV_MAX || !test_bit(type, dev->evbit))
  62                 return;
  63
  64         add_input_randomness(type, code, value);
  65
  66         switch (type) {
  67
  68                 case EV_SYN:
  69                         switch (code) {
  70                                 case SYN_CONFIG:
  71                                         if (dev->event) dev->event(dev, type, code, value);
  72                                         break;
  73
  74                                 case SYN_REPORT:
  75                                         if (dev->sync) return;
  76                                         dev->sync = 1;
  77                                         break;
  78                         }
  79                         break;
  80
  81                 case EV_KEY:
  82
  83                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  84                                 return;
  85
  86                         if (value == 2)
  87                                 break;
  88
  89                         change_bit(code, dev->key);
  90
  91                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  92                                 dev->repeat_key = code;
  93                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  94                         }
  95
  96                         break;
  97
  98                 case EV_ABS:
  99
 100                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
 101                                 return;
 102
 103                         if (dev->absfuzz[code]) {
 104                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
 105                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
 106                                         return;
 107
 108                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 109                                     (value < dev->abs[code] + dev->absfuzz[code]))
 110                                         value = (dev->abs[code] * 3 + value) >> 2;
 111
 112                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 113                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 114                                         value = (dev->abs[code] + value) >> 1;
 115                         }
 116
 117                         if (dev->abs[code] == value)
 118                                 return;
 119
 120                         dev->abs[code] = value;
 121                         break;
 122
 123                 case EV_REL:
 124
 125                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 126                                 return;
 127
 128                         break;
 129
 130                 case EV_MSC:
 131
 132                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 133                                 return;
 134
 135                         if (dev->event) dev->event(dev, type, code, value);
 136
 137                         break;
 138
 139                 case EV_LED:
 140
 141                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 142                                 return;
 143
 144                         change_bit(code, dev->led);
 145                         if (dev->event) dev->event(dev, type, code, value);
 146
 147                         break;
 148
 149                 case EV_SND:
 150
 151                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 152                                 return;
 153
 154                         if (dev->event) dev->event(dev, type, code, value);
 155
 156                         break;
 157
 158                 case EV_REP:
 159
 160                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
 161
 162                         dev->rep[code] = value;
 163                         if (dev->event) dev->event(dev, type, code, value);
 164
 165                         break;
 166
 167                 case EV_FF:
 168                         if (dev->event) dev->event(dev, type, code, value);
 169                         break;
 170         }
 171
 172         if (type != EV_SYN)
 173                 dev->sync = 0;
 174
 175         if (dev->grab)
 176                 dev->grab->handler->event(dev->grab, type, code, value);
 177         else
 178                 list_for_each_entry(handle, &dev->h_list, d_node)
 179                         if (handle->open)
 180                                 handle->handler->event(handle, type, code, value);
 181 }
 182
 183 static void input_repeat_key(unsigned long data)
 184 {
 185         struct input_dev *dev = (void *) data;
 186
 187         if (!test_bit(dev->repeat_key, dev->key))
 188                 return;
 189
 190         input_event(dev, EV_KEY, dev->repeat_key, 2);
 191         input_sync(dev);
 192
 193         if (dev->rep[REP_PERIOD])
 194                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 195 }
 196
 197 int input_accept_process(struct input_handle *handle, struct file *file)
 198 {
 199         if (handle->dev->accept)
 200                 return handle->dev->accept(handle->dev, file);
 201
 202         return 0;
 203 }
 204
 205 int input_grab_device(struct input_handle *handle)
 206 {
 207         if (handle->dev->grab)
 208                 return -EBUSY;
 209
 210         handle->dev->grab = handle;
 211         return 0;
 212 }
 213
 214 void input_release_device(struct input_handle *handle)
 215 {
 216         if (handle->dev->grab == handle)
 217                 handle->dev->grab = NULL;
 218 }
 219
 220 int input_open_device(struct input_handle *handle)
 221 {
 222         handle->open++;
 223         if (handle->dev->open)
 224                 return handle->dev->open(handle->dev);
 225         return 0;
 226 }
 227
 228 int input_flush_device(struct input_handle* handle, struct file* file)
 229 {
 230         if (handle->dev->flush)
 231                 return handle->dev->flush(handle->dev, file);
 232
 233         return 0;
 234 }
 235
 236 void input_close_device(struct input_handle *handle)
 237 {
 238         input_release_device(handle);
 239         if (handle->dev->close)
 240                 handle->dev->close(handle->dev);
 241         handle->open--;
 242 }
 243
 244 static void input_link_handle(struct input_handle *handle)
 245 {
 246         list_add_tail(&handle->d_node, &handle->dev->h_list);
 247         list_add_tail(&handle->h_node, &handle->handler->h_list);
 248 }
 249
 250 #define MATCH_BIT(bit, max) \
 251                 for (i = 0; i < NBITS(max); i++) \
 252                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 253                                 break; \
 254                 if (i != NBITS(max)) \
 255                         continue;
 256
 257 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 258 {
 259         int i;
 260
 261         for (; id->flags || id->driver_info; id++) {
 262
 263                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 264                         if (id->id.bustype != dev->id.bustype)
 265                                 continue;
 266
 267                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 268                         if (id->id.vendor != dev->id.vendor)
 269                                 continue;
 270
 271                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 272                         if (id->id.product != dev->id.product)
 273                                 continue;
 274
 275                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 276                         if (id->id.version != dev->id.version)
 277                                 continue;
 278
 279                 MATCH_BIT(evbit,  EV_MAX);
 280                 MATCH_BIT(keybit, KEY_MAX);
 281                 MATCH_BIT(relbit, REL_MAX);
 282                 MATCH_BIT(absbit, ABS_MAX);
 283                 MATCH_BIT(mscbit, MSC_MAX);
 284                 MATCH_BIT(ledbit, LED_MAX);
 285                 MATCH_BIT(sndbit, SND_MAX);
 286                 MATCH_BIT(ffbit,  FF_MAX);
 287
 288                 return id;
 289         }
 290
 291         return NULL;
 292 }
 293
 294 /*
 295  * Input hotplugging interface - loading event handlers based on
 296  * device bitfields.
 297  */
 298
 299 #ifdef CONFIG_HOTPLUG
 300
 301 /*
 302  * Input hotplugging invokes what /proc/sys/kernel/hotplug says
 303  * (normally /sbin/hotplug) when input devices get added or removed.
 304  *
 305  * This invokes a user mode policy agent, typically helping to load driver
 306  * or other modules, configure the device, and more.  Drivers can provide
 307  * a MODULE_DEVICE_TABLE to help with module loading subtasks.
 308  *
 309  */
 310
 311 #define SPRINTF_BIT_A(bit, name, max) \
 312         do { \
 313                 envp[i++] = scratch; \
 314                 scratch += sprintf(scratch, name); \
 315                 for (j = NBITS(max) - 1; j >= 0; j--) \
 316                         if (dev->bit[j]) break; \
 317                 for (; j >= 0; j--) \
 318                         scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
 319                 scratch++; \
 320         } while (0)
 321
 322 #define SPRINTF_BIT_A2(bit, name, max, ev) \
 323         do { \
 324                 if (test_bit(ev, dev->evbit)) \
 325                         SPRINTF_BIT_A(bit, name, max); \
 326         } while (0)
 327
 328 static void input_call_hotplug(char *verb, struct input_dev *dev)
 329 {
 330         char *argv[3], **envp, *buf, *scratch;
 331         int i = 0, j, value;
 332
 333         if (!hotplug_path[0]) {
 334                 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
 335                 return;
 336         }
 337         if (in_interrupt()) {
 338                 printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
 339                 return;
 340         }
 341         if (!current->fs->root) {
 342                 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
 343                 return;
 344         }
 345         if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
 346                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 347                 return;
 348         }
 349         if (!(buf = kmalloc(1024, GFP_KERNEL))) {
 350                 kfree (envp);
 351                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 352                 return;
 353         }
 354
 355         argv[0] = hotplug_path;
 356         argv[1] = "input";
 357         argv[2] = NULL;
 358
 359         envp[i++] = "HOME=/";
 360         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 361
 362         scratch = buf;
 363
 364         envp[i++] = scratch;
 365         scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
 366
 367         envp[i++] = scratch;
 368         scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
 369                 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
 370
 371         if (dev->name) {
 372                 envp[i++] = scratch;
 373                 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
 374         }
 375
 376         if (dev->phys) {
 377                 envp[i++] = scratch;
 378                 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
 379         }
 380
 381         SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
 382         SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
 383         SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
 384         SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
 385         SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
 386         SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
 387         SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
 388         SPRINTF_BIT_A2(ffbit,  "FF=",  FF_MAX, EV_FF);
 389
 390         envp[i++] = NULL;
 391
 392 #ifdef INPUT_DEBUG
 393         printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
 394                 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
 395 #endif
 396
 397         value = call_usermodehelper(argv [0], argv, envp, 0);
 398
 399         kfree(buf);
 400         kfree(envp);
 401
 402 #ifdef INPUT_DEBUG
 403         if (value != 0)
 404                 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
 405 #endif
 406 }
 407
 408 #endif
 409
 410 void input_register_device(struct input_dev *dev)
 411 {
 412         struct input_handle *handle;
 413         struct input_handler *handler;
 414         struct input_device_id *id;
 415
 416         set_bit(EV_SYN, dev->evbit);
 417
 418         /*
 419          * If delay and period are pre-set by the driver, then autorepeating
 420          * is handled by the driver itself and we don't do it in input.c.
 421          */
 422
 423         init_timer(&dev->timer);
 424         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 425                 dev->timer.data = (long) dev;
 426                 dev->timer.function = input_repeat_key;
 427                 dev->rep[REP_DELAY] = 250;
 428                 dev->rep[REP_PERIOD] = 33;
 429         }
 430
 431         INIT_LIST_HEAD(&dev->h_list);
 432         list_add_tail(&dev->node, &input_dev_list);
 433
 434         list_for_each_entry(handler, &input_handler_list, node)
 435                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 436                         if ((id = input_match_device(handler->id_table, dev)))
 437                                 if ((handle = handler->connect(handler, dev, id)))
 438                                         input_link_handle(handle);
 439
 440 #ifdef CONFIG_HOTPLUG
 441         input_call_hotplug("add", dev);
 442 #endif
 443
 444 #ifdef CONFIG_PROC_FS
 445         input_devices_state++;
 446         wake_up(&input_devices_poll_wait);
 447 #endif
 448 }
 449
 450 void input_unregister_device(struct input_dev *dev)
 451 {
 452         struct list_head * node, * next;
 453
 454         if (!dev) return;
 455
 456         del_timer_sync(&dev->timer);
 457
 458         list_for_each_safe(node, next, &dev->h_list) {
 459                 struct input_handle * handle = to_handle(node);
 460                 list_del_init(&handle->d_node);
 461                 list_del_init(&handle->h_node);
 462                 handle->handler->disconnect(handle);
 463         }
 464
 465 #ifdef CONFIG_HOTPLUG
 466         input_call_hotplug("remove", dev);
 467 #endif
 468
 469         list_del_init(&dev->node);
 470
 471 #ifdef CONFIG_PROC_FS
 472         input_devices_state++;
 473         wake_up(&input_devices_poll_wait);
 474 #endif
 475 }
 476
 477 void input_register_handler(struct input_handler *handler)
 478 {
 479         struct input_dev *dev;
 480         struct input_handle *handle;
 481         struct input_device_id *id;
 482
 483         if (!handler) return;
 484
 485         INIT_LIST_HEAD(&handler->h_list);
 486
 487         if (handler->fops != NULL)
 488                 input_table[handler->minor >> 5] = handler;
 489
 490         list_add_tail(&handler->node, &input_handler_list);
 491
 492         list_for_each_entry(dev, &input_dev_list, node)
 493                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 494                         if ((id = input_match_device(handler->id_table, dev)))
 495                                 if ((handle = handler->connect(handler, dev, id)))
 496                                         input_link_handle(handle);
 497
 498 #ifdef CONFIG_PROC_FS
 499         input_devices_state++;
 500         wake_up(&input_devices_poll_wait);
 501 #endif
 502 }
 503
 504 void input_unregister_handler(struct input_handler *handler)
 505 {
 506         struct list_head * node, * next;
 507
 508         list_for_each_safe(node, next, &handler->h_list) {
 509                 struct input_handle * handle = to_handle_h(node);
 510                 list_del_init(&handle->h_node);
 511                 list_del_init(&handle->d_node);
 512                 handler->disconnect(handle);
 513         }
 514
 515         list_del_init(&handler->node);
 516
 517         if (handler->fops != NULL)
 518                 input_table[handler->minor >> 5] = NULL;
 519
 520 #ifdef CONFIG_PROC_FS
 521         input_devices_state++;
 522         wake_up(&input_devices_poll_wait);
 523 #endif
 524 }
 525
 526 static int input_open_file(struct inode *inode, struct file *file)
 527 {
 528         struct input_handler *handler = input_table[iminor(inode) >> 5];
 529         struct file_operations *old_fops, *new_fops = NULL;
 530         int err;
 531
 532         /* No load-on-demand here? */
 533         if (!handler || !(new_fops = fops_get(handler->fops)))
 534                 return -ENODEV;
 535
 536         /*
 537          * That's _really_ odd. Usually NULL ->open means "nothing special",
 538          * not "no device". Oh, well...
 539          */
 540         if (!new_fops->open) {
 541                 fops_put(new_fops);
 542                 return -ENODEV;
 543         }
 544         old_fops = file->f_op;
 545         file->f_op = new_fops;
 546
 547         err = new_fops->open(inode, file);
 548
 549         if (err) {
 550                 fops_put(file->f_op);
 551                 file->f_op = fops_get(old_fops);
 552         }
 553         fops_put(old_fops);
 554         return err;
 555 }
 556
 557 static struct file_operations input_fops = {
 558         .owner = THIS_MODULE,
 559         .open = input_open_file,
 560 };
 561
 562 #ifdef CONFIG_PROC_FS
 563
 564 #define SPRINTF_BIT_B(bit, name, max) \
 565         do { \
 566                 len += sprintf(buf + len, "B: %s", name); \
 567                 for (i = NBITS(max) - 1; i >= 0; i--) \
 568                         if (dev->bit[i]) break; \
 569                 for (; i >= 0; i--) \
 570                         len += sprintf(buf + len, "%lx ", dev->bit[i]); \
 571                 len += sprintf(buf + len, "\n"); \
 572         } while (0)
 573
 574 #define SPRINTF_BIT_B2(bit, name, max, ev) \
 575         do { \
 576                 if (test_bit(ev, dev->evbit)) \
 577                         SPRINTF_BIT_B(bit, name, max); \
 578         } while (0)
 579
 580
 581 static unsigned int input_devices_poll(struct file *file, poll_table *wait)
 582 {
 583         int state = input_devices_state;
 584         poll_wait(file, &input_devices_poll_wait, wait);
 585         if (state != input_devices_state)
 586                 return POLLIN | POLLRDNORM;
 587         return 0;
 588 }
 589
 590 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 591 {
 592         struct input_dev *dev;
 593         struct input_handle *handle;
 594
 595         off_t at = 0;
 596         int i, len, cnt = 0;
 597
 598         list_for_each_entry(dev, &input_dev_list, node) {
 599
 600                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 601                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 602
 603                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 604                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 605                 len += sprintf(buf + len, "H: Handlers=");
 606
 607                 list_for_each_entry(handle, &dev->h_list, d_node)
 608                         len += sprintf(buf + len, "%s ", handle->name);
 609
 610                 len += sprintf(buf + len, "\n");
 611
 612                 SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
 613                 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
 614                 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
 615                 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
 616                 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
 617                 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
 618                 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
 619                 SPRINTF_BIT_B2(ffbit,  "FF=",  FF_MAX, EV_FF);
 620
 621                 len += sprintf(buf + len, "\n");
 622
 623                 at += len;
 624
 625                 if (at >= pos) {
 626                         if (!*start) {
 627                                 *start = buf + (pos - (at - len));
 628                                 cnt = at - pos;
 629                         } else  cnt += len;
 630                         buf += len;
 631                         if (cnt >= count)
 632                                 break;
 633                 }
 634         }
 635
 636         if (&dev->node == &input_dev_list)
 637                 *eof = 1;
 638
 639         return (count > cnt) ? cnt : count;
 640 }
 641
 642 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 643 {
 644         struct input_handler *handler;
 645
 646         off_t at = 0;
 647         int len = 0, cnt = 0;
 648         int i = 0;
 649
 650         list_for_each_entry(handler, &input_handler_list, node) {
 651
 652                 if (handler->fops)
 653                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
 654                                 i++, handler->name, handler->minor);
 655                 else
 656                         len = sprintf(buf, "N: Number=%d Name=%s\n",
 657                                 i++, handler->name);
 658
 659                 at += len;
 660
 661                 if (at >= pos) {
 662                         if (!*start) {
 663                                 *start = buf + (pos - (at - len));
 664                                 cnt = at - pos;
 665                         } else  cnt += len;
 666                         buf += len;
 667                         if (cnt >= count)
 668                                 break;
 669                 }
 670         }
 671         if (&handler->node == &input_handler_list)
 672                 *eof = 1;
 673
 674         return (count > cnt) ? cnt : count;
 675 }
 676
 677 static int __init input_proc_init(void)
 678 {
 679         struct proc_dir_entry *entry;
 680
 681         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 682         if (proc_bus_input_dir == NULL)
 683                 return -ENOMEM;
 684         proc_bus_input_dir->owner = THIS_MODULE;
 685         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
 686         if (entry == NULL) {
 687                 remove_proc_entry("input", proc_bus);
 688                 return -ENOMEM;
 689         }
 690         entry->owner = THIS_MODULE;
 691         entry->proc_fops->poll = input_devices_poll;
 692         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
 693         if (entry == NULL) {
 694                 remove_proc_entry("devices", proc_bus_input_dir);
 695                 remove_proc_entry("input", proc_bus);
 696                 return -ENOMEM;
 697         }
 698         entry->owner = THIS_MODULE;
 699         return 0;
 700 }
 701 #else /* !CONFIG_PROC_FS */
 702 static inline int input_proc_init(void) { return 0; }
 703 #endif
 704
 705 struct class_simple *input_class;
 706
 707 static int __init input_init(void)
 708 {
 709         int retval = -ENOMEM;
 710
 711         input_class = class_simple_create(THIS_MODULE, "input");
 712         if (IS_ERR(input_class))
 713                 return PTR_ERR(input_class);
 714         input_proc_init();
 715         retval = register_chrdev(INPUT_MAJOR, "input", &input_fops);
 716         if (retval) {
 717                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
 718                 remove_proc_entry("devices", proc_bus_input_dir);
 719                 remove_proc_entry("handlers", proc_bus_input_dir);
 720                 remove_proc_entry("input", proc_bus);
 721                 class_simple_destroy(input_class);
 722                 return retval;
 723         }
 724
 725         retval = devfs_mk_dir("input");
 726         if (retval) {
 727                 remove_proc_entry("devices", proc_bus_input_dir);
 728                 remove_proc_entry("handlers", proc_bus_input_dir);
 729                 remove_proc_entry("input", proc_bus);
 730                 unregister_chrdev(INPUT_MAJOR, "input");
 731                 class_simple_destroy(input_class);
 732         }
 733         return retval;
 734 }
 735
 736 static void __exit input_exit(void)
 737 {
 738         remove_proc_entry("devices", proc_bus_input_dir);
 739         remove_proc_entry("handlers", proc_bus_input_dir);
 740         remove_proc_entry("input", proc_bus);
 741
 742         devfs_remove("input");
 743         unregister_chrdev(INPUT_MAJOR, "input");
 744         class_simple_destroy(input_class);
 745 }
 746
 747 subsys_initcall(input_init);
 748 module_exit(input_exit);