l4/pkg/input/lib/contrib/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 DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
  54 static int input_devices_state;
  55 #endif
  56
  57 static inline unsigned int ms_to_jiffies(unsigned int ms)
  58 {
  59         unsigned int j;
  60         j = (ms * HZ + 500) / 1000;
  61         return (j > 0) ? j : 1;
  62 }
  63
  64
  65 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  66 {
  67         struct input_handle *handle;
  68
  69         if (type > EV_MAX || !test_bit(type, dev->evbit))
  70                 return;
  71
  72         add_input_randomness(type, code, value);
  73
  74         switch (type) {
  75
  76                 case EV_SYN:
  77                         switch (code) {
  78                                 case SYN_CONFIG:
  79                                         if (dev->event) dev->event(dev, type, code, value);
  80                                         break;
  81
  82                                 case SYN_REPORT:
  83                                         if (dev->sync) return;
  84                                         dev->sync = 1;
  85                                         break;
  86                         }
  87                         break;
  88
  89                 case EV_KEY:
  90
  91                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  92                                 return;
  93
  94                         if (value == 2)
  95                                 break;
  96
  97                         change_bit(code, dev->key);
  98
  99                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->timer.data && value) {
 100                                 dev->repeat_key = code;
 101                                 mod_timer(&dev->timer, jiffies + ms_to_jiffies(dev->rep[REP_DELAY]));
 102                         }
 103
 104                         break;
 105
 106                 case EV_ABS:
 107
 108                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
 109                                 return;
 110
 111                         if (dev->absfuzz[code]) {
 112                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
 113                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
 114                                         return;
 115
 116                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 117                                     (value < dev->abs[code] + dev->absfuzz[code]))
 118                                         value = (dev->abs[code] * 3 + value) >> 2;
 119
 120                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 121                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 122                                         value = (dev->abs[code] + value) >> 1;
 123                         }
 124
 125                         if (dev->abs[code] == value)
 126                                 return;
 127
 128                         dev->abs[code] = value;
 129                         break;
 130
 131                 case EV_REL:
 132
 133                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 134                                 return;
 135
 136                         break;
 137
 138                 case EV_MSC:
 139
 140                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 141                                 return;
 142
 143                         if (dev->event) dev->event(dev, type, code, value);
 144
 145                         break;
 146
 147                 case EV_LED:
 148
 149                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 150                                 return;
 151
 152                         change_bit(code, dev->led);
 153                         if (dev->event) dev->event(dev, type, code, value);
 154
 155                         break;
 156
 157                 case EV_SND:
 158
 159                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 160                                 return;
 161
 162                         if (dev->event) dev->event(dev, type, code, value);
 163
 164                         break;
 165
 166                 case EV_REP:
 167
 168                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
 169
 170                         dev->rep[code] = value;
 171                         if (dev->event) dev->event(dev, type, code, value);
 172
 173                         break;
 174
 175                 case EV_FF:
 176                         if (dev->event) dev->event(dev, type, code, value);
 177                         break;
 178         }
 179
 180         if (type != EV_SYN)
 181                 dev->sync = 0;
 182
 183         if (dev->grab)
 184                 dev->grab->handler->event(dev->grab, type, code, value);
 185         else
 186                 list_for_each_entry(handle, &dev->h_list, d_node)
 187                         if (handle->open)
 188                                 handle->handler->event(handle, type, code, value);
 189 }
 190
 191 static void input_repeat_key(unsigned long data)
 192 {
 193         struct input_dev *dev = (void *) data;
 194
 195         if (!test_bit(dev->repeat_key, dev->key))
 196                 return;
 197
 198         input_event(dev, EV_KEY, dev->repeat_key, 2);
 199         input_sync(dev);
 200
 201         mod_timer(&dev->timer, jiffies + ms_to_jiffies(dev->rep[REP_PERIOD]));
 202 }
 203
 204 int input_accept_process(struct input_handle *handle, struct file *file)
 205 {
 206         if (handle->dev->accept)
 207                 return handle->dev->accept(handle->dev, file);
 208
 209         return 0;
 210 }
 211
 212 int input_grab_device(struct input_handle *handle)
 213 {
 214         if (handle->dev->grab)
 215                 return -EBUSY;
 216
 217         handle->dev->grab = handle;
 218         return 0;
 219 }
 220
 221 void input_release_device(struct input_handle *handle)
 222 {
 223         if (handle->dev->grab == handle)
 224                 handle->dev->grab = NULL;
 225 }
 226
 227 int input_open_device(struct input_handle *handle)
 228 {
 229         handle->open++;
 230         if (handle->dev->open)
 231                 return handle->dev->open(handle->dev);
 232         return 0;
 233 }
 234
 235 int input_flush_device(struct input_handle* handle, struct file* file)
 236 {
 237         if (handle->dev->flush)
 238                 return handle->dev->flush(handle->dev, file);
 239
 240         return 0;
 241 }
 242
 243 void input_close_device(struct input_handle *handle)
 244 {
 245         input_release_device(handle);
 246         if (handle->dev->close)
 247                 handle->dev->close(handle->dev);
 248         handle->open--;
 249 }
 250
 251 static void input_link_handle(struct input_handle *handle)
 252 {
 253         list_add_tail(&handle->d_node, &handle->dev->h_list);
 254         list_add_tail(&handle->h_node, &handle->handler->h_list);
 255 }
 256
 257 #define MATCH_BIT(bit, max) \
 258                 for (i = 0; i < NBITS(max); i++) \
 259                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 260                                 break; \
 261                 if (i != NBITS(max)) \
 262                         continue;
 263
 264 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
 265 {
 266         int i;
 267
 268         for (; id->flags || id->driver_info; id++) {
 269
 270                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 271                         if (id->id.bustype != dev->id.bustype)
 272                                 continue;
 273
 274                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 275                         if (id->id.vendor != dev->id.vendor)
 276                                 continue;
 277
 278                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 279                         if (id->id.product != dev->id.product)
 280                                 continue;
 281
 282                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 283                         if (id->id.version != dev->id.version)
 284                                 continue;
 285
 286                 MATCH_BIT(evbit,  EV_MAX);
 287                 MATCH_BIT(keybit, KEY_MAX);
 288                 MATCH_BIT(relbit, REL_MAX);
 289                 MATCH_BIT(absbit, ABS_MAX);
 290                 MATCH_BIT(mscbit, MSC_MAX);
 291                 MATCH_BIT(ledbit, LED_MAX);
 292                 MATCH_BIT(sndbit, SND_MAX);
 293                 MATCH_BIT(ffbit,  FF_MAX);
 294
 295                 return id;
 296         }
 297
 298         return NULL;
 299 }
 300
 301 /*
 302  * Input hotplugging interface - loading event handlers based on
 303  * device bitfields.
 304  */
 305
 306 #ifdef CONFIG_HOTPLUG
 307
 308 /*
 309  * Input hotplugging invokes what /proc/sys/kernel/hotplug says
 310  * (normally /sbin/hotplug) when input devices get added or removed.
 311  *
 312  * This invokes a user mode policy agent, typically helping to load driver
 313  * or other modules, configure the device, and more.  Drivers can provide
 314  * a MODULE_DEVICE_TABLE to help with module loading subtasks.
 315  *
 316  */
 317
 318 #define SPRINTF_BIT_A(bit, name, max) \
 319         do { \
 320                 envp[i++] = scratch; \
 321                 scratch += sprintf(scratch, name); \
 322                 for (j = NBITS(max) - 1; j >= 0; j--) \
 323                         if (dev->bit[j]) break; \
 324                 for (; j >= 0; j--) \
 325                         scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
 326                 scratch++; \
 327         } while (0)
 328
 329 #define SPRINTF_BIT_A2(bit, name, max, ev) \
 330         do { \
 331                 if (test_bit(ev, dev->evbit)) \
 332                         SPRINTF_BIT_A(bit, name, max); \
 333         } while (0)
 334
 335 static void input_call_hotplug(char *verb, struct input_dev *dev)
 336 {
 337         char *argv[3], **envp, *buf, *scratch;
 338         int i = 0, j, value;
 339
 340         if (!hotplug_path[0]) {
 341                 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
 342                 return;
 343         }
 344         if (in_interrupt()) {
 345                 printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
 346                 return;
 347         }
 348         if (!current->fs->root) {
 349                 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
 350                 return;
 351         }
 352         if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
 353                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 354                 return;
 355         }
 356         if (!(buf = kmalloc(1024, GFP_KERNEL))) {
 357                 kfree (envp);
 358                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
 359                 return;
 360         }
 361
 362         argv[0] = hotplug_path;
 363         argv[1] = "input";
 364         argv[2] = NULL;
 365
 366         envp[i++] = "HOME=/";
 367         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 368
 369         scratch = buf;
 370
 371         envp[i++] = scratch;
 372         scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
 373
 374         envp[i++] = scratch;
 375         scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
 376                 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
 377
 378         if (dev->name) {
 379                 envp[i++] = scratch;
 380                 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
 381         }
 382
 383         if (dev->phys) {
 384                 envp[i++] = scratch;
 385                 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
 386         }
 387
 388         SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
 389         SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
 390         SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
 391         SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
 392         SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
 393         SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
 394         SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
 395         SPRINTF_BIT_A2(ffbit,  "FF=",  FF_MAX, EV_FF);
 396
 397         envp[i++] = NULL;
 398
 399 #ifdef INPUT_DEBUG
 400         printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
 401                 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
 402 #endif
 403
 404         value = call_usermodehelper(argv [0], argv, envp, 0);
 405
 406         kfree(buf);
 407         kfree(envp);
 408
 409 #ifdef INPUT_DEBUG
 410         if (value != 0)
 411                 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
 412 #endif
 413 }
 414
 415 #endif
 416
 417 void input_register_device(struct input_dev *dev)
 418 {
 419         struct input_handle *handle;
 420         struct input_handler *handler;
 421         struct input_device_id *id;
 422
 423         set_bit(EV_SYN, dev->evbit);
 424
 425         /*
 426          * If delay and period are pre-set by the driver, then autorepeating
 427          * is handled by the driver itself and we don't do it in input.c.
 428          */
 429
 430         init_timer(&dev->timer);
 431         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
 432                 dev->timer.data = (long) dev;
 433                 dev->timer.function = input_repeat_key;
 434                 dev->rep[REP_DELAY] = 250;
 435                 dev->rep[REP_PERIOD] = 33;
 436         }
 437
 438         INIT_LIST_HEAD(&dev->h_list);
 439         list_add_tail(&dev->node, &input_dev_list);
 440
 441         list_for_each_entry(handler, &input_handler_list, node)
 442                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 443                         if ((id = input_match_device(handler->id_table, dev)))
 444                                 if ((handle = handler->connect(handler, dev, id)))
 445                                         input_link_handle(handle);
 446
 447 #ifdef CONFIG_HOTPLUG
 448         input_call_hotplug("add", dev);
 449 #endif
 450
 451 #ifdef CONFIG_PROC_FS
 452         input_devices_state++;
 453         wake_up(&input_devices_poll_wait);
 454 #endif
 455 }
 456
 457 void input_unregister_device(struct input_dev *dev)
 458 {
 459         struct list_head * node, * next;
 460
 461         if (!dev) return;
 462
 463         del_timer_sync(&dev->timer);
 464
 465         list_for_each_safe(node, next, &dev->h_list) {
 466                 struct input_handle * handle = to_handle(node);
 467                 list_del_init(&handle->d_node);
 468                 list_del_init(&handle->h_node);
 469                 handle->handler->disconnect(handle);
 470         }
 471
 472 #ifdef CONFIG_HOTPLUG
 473         input_call_hotplug("remove", dev);
 474 #endif
 475
 476         list_del_init(&dev->node);
 477
 478 #ifdef CONFIG_PROC_FS
 479         input_devices_state++;
 480         wake_up(&input_devices_poll_wait);
 481 #endif
 482 }
 483
 484 void input_register_handler(struct input_handler *handler)
 485 {
 486         struct input_dev *dev;
 487         struct input_handle *handle;
 488         struct input_device_id *id;
 489
 490         if (!handler) return;
 491
 492         INIT_LIST_HEAD(&handler->h_list);
 493
 494         if (handler->fops != NULL)
 495                 input_table[handler->minor >> 5] = handler;
 496
 497         list_add_tail(&handler->node, &input_handler_list);
 498
 499         list_for_each_entry(dev, &input_dev_list, node)
 500                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
 501                         if ((id = input_match_device(handler->id_table, dev)))
 502                                 if ((handle = handler->connect(handler, dev, id)))
 503                                         input_link_handle(handle);
 504
 505 #ifdef CONFIG_PROC_FS
 506         input_devices_state++;
 507         wake_up(&input_devices_poll_wait);
 508 #endif
 509 }
 510
 511 void input_unregister_handler(struct input_handler *handler)
 512 {
 513         struct list_head * node, * next;
 514
 515         list_for_each_safe(node, next, &handler->h_list) {
 516                 struct input_handle * handle = to_handle_h(node);
 517                 list_del_init(&handle->h_node);
 518                 list_del_init(&handle->d_node);
 519                 handler->disconnect(handle);
 520         }
 521
 522         list_del_init(&handler->node);
 523
 524         if (handler->fops != NULL)
 525                 input_table[handler->minor >> 5] = NULL;
 526
 527 #ifdef CONFIG_PROC_FS
 528         input_devices_state++;
 529         wake_up(&input_devices_poll_wait);
 530 #endif
 531 }
 532
 533 #ifndef L4INPUT
 534
 535 static int input_open_file(struct inode *inode, struct file *file)
 536 {
 537         struct input_handler *handler = input_table[iminor(inode) >> 5];
 538         struct file_operations *old_fops, *new_fops = NULL;
 539         int err;
 540
 541         /* No load-on-demand here? */
 542         if (!handler || !(new_fops = fops_get(handler->fops)))
 543                 return -ENODEV;
 544
 545         /*
 546          * That's _really_ odd. Usually NULL ->open means "nothing special",
 547          * not "no device". Oh, well...
 548          */
 549         if (!new_fops->open) {
 550                 fops_put(new_fops);
 551                 return -ENODEV;
 552         }
 553         old_fops = file->f_op;
 554         file->f_op = new_fops;
 555
 556         err = new_fops->open(inode, file);
 557
 558         if (err) {
 559                 fops_put(file->f_op);
 560                 file->f_op = fops_get(old_fops);
 561         }
 562         fops_put(old_fops);
 563         return err;
 564 }
 565
 566 static struct file_operations input_fops = {
 567         .owner = THIS_MODULE,
 568         .open = input_open_file,
 569 };
 570
 571 #else
 572
 573 static int input_open_file(struct inode *inode, struct file *file)
 574 {
 575         return -EPERM;
 576 }
 577 static struct file_operations input_fops = {
 578         .open = input_open_file,
 579 };
 580
 581 #endif
 582
 583 #ifdef CONFIG_PROC_FS
 584
 585 #define SPRINTF_BIT_B(bit, name, max) \
 586         do { \
 587                 len += sprintf(buf + len, "B: %s", name); \
 588                 for (i = NBITS(max) - 1; i >= 0; i--) \
 589                         if (dev->bit[i]) break; \
 590                 for (; i >= 0; i--) \
 591                         len += sprintf(buf + len, "%lx ", dev->bit[i]); \
 592                 len += sprintf(buf + len, "\n"); \
 593         } while (0)
 594
 595 #define SPRINTF_BIT_B2(bit, name, max, ev) \
 596         do { \
 597                 if (test_bit(ev, dev->evbit)) \
 598                         SPRINTF_BIT_B(bit, name, max); \
 599         } while (0)
 600
 601
 602 static unsigned int input_devices_poll(struct file *file, poll_table *wait)
 603 {
 604         int state = input_devices_state;
 605         poll_wait(file, &input_devices_poll_wait, wait);
 606         if (state != input_devices_state)
 607                 return POLLIN | POLLRDNORM;
 608         return 0;
 609 }
 610
 611 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 612 {
 613         struct input_dev *dev;
 614         struct input_handle *handle;
 615
 616         off_t at = 0;
 617         int i, len, cnt = 0;
 618
 619         list_for_each_entry(dev, &input_dev_list, node) {
 620
 621                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 622                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 623
 624                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 625                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 626                 len += sprintf(buf + len, "H: Handlers=");
 627
 628                 list_for_each_entry(handle, &dev->h_list, d_node)
 629                         len += sprintf(buf + len, "%s ", handle->name);
 630
 631                 len += sprintf(buf + len, "\n");
 632
 633                 SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
 634                 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
 635                 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
 636                 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
 637                 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
 638                 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
 639                 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
 640                 SPRINTF_BIT_B2(ffbit,  "FF=",  FF_MAX, EV_FF);
 641
 642                 len += sprintf(buf + len, "\n");
 643
 644                 at += len;
 645
 646                 if (at >= pos) {
 647                         if (!*start) {
 648                                 *start = buf + (pos - (at - len));
 649                                 cnt = at - pos;
 650                         } else  cnt += len;
 651                         buf += len;
 652                         if (cnt >= count)
 653                                 break;
 654                 }
 655         }
 656
 657         if (&dev->node == &input_dev_list)
 658                 *eof = 1;
 659
 660         return (count > cnt) ? cnt : count;
 661 }
 662
 663 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
 664 {
 665         struct input_handler *handler;
 666
 667         off_t at = 0;
 668         int len = 0, cnt = 0;
 669         int i = 0;
 670
 671         list_for_each_entry(handler, &input_handler_list, node) {
 672
 673                 if (handler->fops)
 674                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
 675                                 i++, handler->name, handler->minor);
 676                 else
 677                         len = sprintf(buf, "N: Number=%d Name=%s\n",
 678                                 i++, handler->name);
 679
 680                 at += len;
 681
 682                 if (at >= pos) {
 683                         if (!*start) {
 684                                 *start = buf + (pos - (at - len));
 685                                 cnt = at - pos;
 686                         } else  cnt += len;
 687                         buf += len;
 688                         if (cnt >= count)
 689                                 break;
 690                 }
 691         }
 692         if (&handler->node == &input_handler_list)
 693                 *eof = 1;
 694
 695         return (count > cnt) ? cnt : count;
 696 }
 697
 698 static int __init input_proc_init(void)
 699 {
 700         struct proc_dir_entry *entry;
 701
 702         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 703         if (proc_bus_input_dir == NULL)
 704                 return -ENOMEM;
 705         proc_bus_input_dir->owner = THIS_MODULE;
 706         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
 707         if (entry == NULL) {
 708                 remove_proc_entry("input", proc_bus);
 709                 return -ENOMEM;
 710         }
 711         entry->owner = THIS_MODULE;
 712         entry->proc_fops->poll = input_devices_poll;
 713         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
 714         if (entry == NULL) {
 715                 remove_proc_entry("devices", proc_bus_input_dir);
 716                 remove_proc_entry("input", proc_bus);
 717                 return -ENOMEM;
 718         }
 719         entry->owner = THIS_MODULE;
 720         return 0;
 721 }
 722 #else /* !CONFIG_PROC_FS */
 723 static inline int input_proc_init(void) { return 0; }
 724 #endif
 725
 726 struct class_simple *input_class;
 727
 728 static int __init input_init(void)
 729 {
 730         int retval = -ENOMEM;
 731
 732         input_class = class_simple_create(THIS_MODULE, "input");
 733 #ifndef L4INPUT
 734         if (IS_ERR(input_class))
 735                 return PTR_ERR(input_class);
 736 #endif
 737         input_proc_init();
 738         retval = register_chrdev(INPUT_MAJOR, "input", &input_fops);
 739         if (retval) {
 740                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
 741                 remove_proc_entry("devices", proc_bus_input_dir);
 742                 remove_proc_entry("handlers", proc_bus_input_dir);
 743                 remove_proc_entry("input", proc_bus);
 744                 class_simple_destroy(input_class);
 745                 return retval;
 746         }
 747
 748         retval = devfs_mk_dir("input");
 749         if (retval) {
 750                 remove_proc_entry("devices", proc_bus_input_dir);
 751                 remove_proc_entry("handlers", proc_bus_input_dir);
 752                 remove_proc_entry("input", proc_bus);
 753                 unregister_chrdev(INPUT_MAJOR, "input");
 754                 class_simple_destroy(input_class);
 755         }
 756         return retval;
 757 }
 758
 759 static void __exit input_exit(void)
 760 {
 761         remove_proc_entry("devices", proc_bus_input_dir);
 762         remove_proc_entry("handlers", proc_bus_input_dir);
 763         remove_proc_entry("input", proc_bus);
 764
 765         devfs_remove("input");
 766         unregister_chrdev(INPUT_MAJOR, "input");
 767         class_simple_destroy(input_class);
 768 }
 769
 770 subsys_initcall(input_init);
 771 module_exit(input_exit);