SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/smp_lock.h>
  15 #include <linux/input.h>
  16 #include <linux/module.h>
  17 #include <linux/random.h>
  18 #include <linux/major.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/poll.h>
  23 #include <linux/device.h>
  24 #include <linux/mutex.h>
  25
  26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  27 MODULE_DESCRIPTION("Input core");
  28 MODULE_LICENSE("GPL");
  29
  30 #define INPUT_DEVICES   256
  31
  32 static LIST_HEAD(input_dev_list);
  33 static LIST_HEAD(input_handler_list);
  34
  35 static struct input_handler *input_table[8];
  36
  37 /**
  38  * input_event() - report new input event
  39  * @dev: device that generated the event
  40  * @type: type of the event
  41  * @code: event code
  42  * @value: value of the event
  43  *
  44  * This function should be used by drivers implementing various input devices
  45  * See also input_inject_event()
  46  */
  47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  48 {
  49         struct input_handle *handle;
  50
  51         if (type > EV_MAX || !test_bit(type, dev->evbit))
  52                 return;
  53
  54         add_input_randomness(type, code, value);
  55
  56         switch (type) {
  57
  58                 case EV_SYN:
  59                         switch (code) {
  60                                 case SYN_CONFIG:
  61                                         if (dev->event)
  62                                                 dev->event(dev, type, code, value);
  63                                         break;
  64
  65                                 case SYN_REPORT:
  66                                         if (dev->sync)
  67                                                 return;
  68                                         dev->sync = 1;
  69                                         break;
  70                         }
  71                         break;
  72
  73                 case EV_KEY:
  74
  75                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  76                                 return;
  77
  78                         if (value == 2)
  79                                 break;
  80
  81                         change_bit(code, dev->key);
  82
  83                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  84                                 dev->repeat_key = code;
  85                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  86                         }
  87
  88                         break;
  89
  90                 case EV_SW:
  91
  92                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
  93                                 return;
  94
  95                         change_bit(code, dev->sw);
  96
  97                         break;
  98
  99                 case EV_ABS:
 100
 101                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
 102                                 return;
 103
 104                         if (dev->absfuzz[code]) {
 105                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
 106                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
 107                                         return;
 108
 109                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
 110                                     (value < dev->abs[code] + dev->absfuzz[code]))
 111                                         value = (dev->abs[code] * 3 + value) >> 2;
 112
 113                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
 114                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
 115                                         value = (dev->abs[code] + value) >> 1;
 116                         }
 117
 118                         if (dev->abs[code] == value)
 119                                 return;
 120
 121                         dev->abs[code] = value;
 122                         break;
 123
 124                 case EV_REL:
 125
 126                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
 127                                 return;
 128
 129                         break;
 130
 131                 case EV_MSC:
 132
 133                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
 134                                 return;
 135
 136                         if (dev->event)
 137                                 dev->event(dev, type, code, value);
 138
 139                         break;
 140
 141                 case EV_LED:
 142
 143                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 144                                 return;
 145
 146                         change_bit(code, dev->led);
 147
 148                         if (dev->event)
 149                                 dev->event(dev, type, code, value);
 150
 151                         break;
 152
 153                 case EV_SND:
 154
 155                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 156                                 return;
 157
 158                         if (!!test_bit(code, dev->snd) != !!value)
 159                                 change_bit(code, dev->snd);
 160
 161                         if (dev->event)
 162                                 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)
 169                                 return;
 170
 171                         dev->rep[code] = value;
 172                         if (dev->event)
 173                                 dev->event(dev, type, code, value);
 174
 175                         break;
 176
 177                 case EV_FF:
 178
 179                         if (value < 0)
 180                                 return;
 181
 182                         if (dev->event)
 183                                 dev->event(dev, type, code, value);
 184                         break;
 185         }
 186
 187         if (type != EV_SYN)
 188                 dev->sync = 0;
 189
 190         if (dev->grab)
 191                 dev->grab->handler->event(dev->grab, type, code, value);
 192         else
 193                 list_for_each_entry(handle, &dev->h_list, d_node)
 194                         if (handle->open)
 195                                 handle->handler->event(handle, type, code, value);
 196 }
 197 EXPORT_SYMBOL(input_event);
 198
 199 /**
 200  * input_inject_event() - send input event from input handler
 201  * @handle: input handle to send event through
 202  * @type: type of the event
 203  * @code: event code
 204  * @value: value of the event
 205  *
 206  * Similar to input_event() but will ignore event if device is "grabbed" and handle
 207  * injecting event is not the one that owns the device.
 208  */
 209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 210 {
 211         if (!handle->dev->grab || handle->dev->grab == handle)
 212                 input_event(handle->dev, type, code, value);
 213 }
 214 EXPORT_SYMBOL(input_inject_event);
 215
 216 static void input_repeat_key(unsigned long data)
 217 {
 218         struct input_dev *dev = (void *) data;
 219
 220         if (!test_bit(dev->repeat_key, dev->key))
 221                 return;
 222
 223         input_event(dev, EV_KEY, dev->repeat_key, 2);
 224         input_sync(dev);
 225
 226         if (dev->rep[REP_PERIOD])
 227                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 228 }
 229
 230 int input_grab_device(struct input_handle *handle)
 231 {
 232         if (handle->dev->grab)
 233                 return -EBUSY;
 234
 235         handle->dev->grab = handle;
 236         return 0;
 237 }
 238 EXPORT_SYMBOL(input_grab_device);
 239
 240 void input_release_device(struct input_handle *handle)
 241 {
 242         struct input_dev *dev = handle->dev;
 243
 244         if (dev->grab == handle) {
 245                 dev->grab = NULL;
 246
 247                 list_for_each_entry(handle, &dev->h_list, d_node)
 248                         if (handle->handler->start)
 249                                 handle->handler->start(handle);
 250         }
 251 }
 252 EXPORT_SYMBOL(input_release_device);
 253
 254 int input_open_device(struct input_handle *handle)
 255 {
 256         struct input_dev *dev = handle->dev;
 257         int err;
 258
 259         err = mutex_lock_interruptible(&dev->mutex);
 260         if (err)
 261                 return err;
 262
 263         handle->open++;
 264
 265         if (!dev->users++ && dev->open)
 266                 err = dev->open(dev);
 267
 268         if (err)
 269                 handle->open--;
 270
 271         mutex_unlock(&dev->mutex);
 272
 273         return err;
 274 }
 275 EXPORT_SYMBOL(input_open_device);
 276
 277 int input_flush_device(struct input_handle* handle, struct file* file)
 278 {
 279         if (handle->dev->flush)
 280                 return handle->dev->flush(handle->dev, file);
 281
 282         return 0;
 283 }
 284 EXPORT_SYMBOL(input_flush_device);
 285
 286 void input_close_device(struct input_handle *handle)
 287 {
 288         struct input_dev *dev = handle->dev;
 289
 290         input_release_device(handle);
 291
 292         mutex_lock(&dev->mutex);
 293
 294         if (!--dev->users && dev->close)
 295                 dev->close(dev);
 296         handle->open--;
 297
 298         mutex_unlock(&dev->mutex);
 299 }
 300 EXPORT_SYMBOL(input_close_device);
 301
 302 static int input_fetch_keycode(struct input_dev *dev, int scancode)
 303 {
 304         switch (dev->keycodesize) {
 305                 case 1:
 306                         return ((u8 *)dev->keycode)[scancode];
 307
 308                 case 2:
 309                         return ((u16 *)dev->keycode)[scancode];
 310
 311                 default:
 312                         return ((u32 *)dev->keycode)[scancode];
 313         }
 314 }
 315
 316 static int input_default_getkeycode(struct input_dev *dev,
 317                                     int scancode, int *keycode)
 318 {
 319         if (!dev->keycodesize)
 320                 return -EINVAL;
 321
 322         if (scancode < 0 || scancode >= dev->keycodemax)
 323                 return -EINVAL;
 324
 325         *keycode = input_fetch_keycode(dev, scancode);
 326
 327         return 0;
 328 }
 329
 330 static int input_default_setkeycode(struct input_dev *dev,
 331                                     int scancode, int keycode)
 332 {
 333         int old_keycode;
 334         int i;
 335
 336         if (scancode < 0 || scancode >= dev->keycodemax)
 337                 return -EINVAL;
 338
 339         if (keycode < 0 || keycode > KEY_MAX)
 340                 return -EINVAL;
 341
 342         if (!dev->keycodesize)
 343                 return -EINVAL;
 344
 345         if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
 346                 return -EINVAL;
 347
 348         switch (dev->keycodesize) {
 349                 case 1: {
 350                         u8 *k = (u8 *)dev->keycode;
 351                         old_keycode = k[scancode];
 352                         k[scancode] = keycode;
 353                         break;
 354                 }
 355                 case 2: {
 356                         u16 *k = (u16 *)dev->keycode;
 357                         old_keycode = k[scancode];
 358                         k[scancode] = keycode;
 359                         break;
 360                 }
 361                 default: {
 362                         u32 *k = (u32 *)dev->keycode;
 363                         old_keycode = k[scancode];
 364                         k[scancode] = keycode;
 365                         break;
 366                 }
 367         }
 368
 369         clear_bit(old_keycode, dev->keybit);
 370         set_bit(keycode, dev->keybit);
 371
 372         for (i = 0; i < dev->keycodemax; i++) {
 373                 if (input_fetch_keycode(dev, i) == old_keycode) {
 374                         set_bit(old_keycode, dev->keybit);
 375                         break; /* Setting the bit twice is useless, so break */
 376                 }
 377         }
 378
 379         return 0;
 380 }
 381
 382
 383 static void input_link_handle(struct input_handle *handle)
 384 {
 385         list_add_tail(&handle->d_node, &handle->dev->h_list);
 386         list_add_tail(&handle->h_node, &handle->handler->h_list);
 387 }
 388
 389 #define MATCH_BIT(bit, max) \
 390                 for (i = 0; i < NBITS(max); i++) \
 391                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 392                                 break; \
 393                 if (i != NBITS(max)) \
 394                         continue;
 395
 396 static const struct input_device_id *input_match_device(const struct input_device_id *id,
 397                                                         struct input_dev *dev)
 398 {
 399         int i;
 400
 401         for (; id->flags || id->driver_info; id++) {
 402
 403                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 404                         if (id->bustype != dev->id.bustype)
 405                                 continue;
 406
 407                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 408                         if (id->vendor != dev->id.vendor)
 409                                 continue;
 410
 411                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 412                         if (id->product != dev->id.product)
 413                                 continue;
 414
 415                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 416                         if (id->version != dev->id.version)
 417                                 continue;
 418
 419                 MATCH_BIT(evbit,  EV_MAX);
 420                 MATCH_BIT(keybit, KEY_MAX);
 421                 MATCH_BIT(relbit, REL_MAX);
 422                 MATCH_BIT(absbit, ABS_MAX);
 423                 MATCH_BIT(mscbit, MSC_MAX);
 424                 MATCH_BIT(ledbit, LED_MAX);
 425                 MATCH_BIT(sndbit, SND_MAX);
 426                 MATCH_BIT(ffbit,  FF_MAX);
 427                 MATCH_BIT(swbit,  SW_MAX);
 428
 429                 return id;
 430         }
 431
 432         return NULL;
 433 }
 434
 435 #ifdef CONFIG_PROC_FS
 436
 437 static struct proc_dir_entry *proc_bus_input_dir;
 438 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 439 static int input_devices_state;
 440
 441 static inline void input_wakeup_procfs_readers(void)
 442 {
 443         input_devices_state++;
 444         wake_up(&input_devices_poll_wait);
 445 }
 446
 447 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 448 {
 449         int state = input_devices_state;
 450
 451         poll_wait(file, &input_devices_poll_wait, wait);
 452         if (state != input_devices_state)
 453                 return POLLIN | POLLRDNORM;
 454
 455         return 0;
 456 }
 457
 458 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
 459 {
 460         struct list_head *node;
 461         loff_t i = 0;
 462
 463         list_for_each(node, list)
 464                 if (i++ == *pos)
 465                         return node;
 466
 467         return NULL;
 468 }
 469
 470 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
 471 {
 472         if (element->next == list)
 473                 return NULL;
 474
 475         ++(*pos);
 476         return element->next;
 477 }
 478
 479 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 480 {
 481         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 482
 483         return list_get_nth_element(&input_dev_list, pos);
 484 }
 485
 486 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 487 {
 488         return list_get_next_element(&input_dev_list, v, pos);
 489 }
 490
 491 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 492 {
 493         /* release lock here */
 494 }
 495
 496 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 497                                    unsigned long *bitmap, int max)
 498 {
 499         int i;
 500
 501         for (i = NBITS(max) - 1; i > 0; i--)
 502                 if (bitmap[i])
 503                         break;
 504
 505         seq_printf(seq, "B: %s=", name);
 506         for (; i >= 0; i--)
 507                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 508         seq_putc(seq, '\n');
 509 }
 510
 511 static int input_devices_seq_show(struct seq_file *seq, void *v)
 512 {
 513         struct input_dev *dev = container_of(v, struct input_dev, node);
 514         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
 515         struct input_handle *handle;
 516
 517         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 518                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 519
 520         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 521         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 522         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 523         seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
 524         seq_printf(seq, "H: Handlers=");
 525
 526         list_for_each_entry(handle, &dev->h_list, d_node)
 527                 seq_printf(seq, "%s ", handle->name);
 528         seq_putc(seq, '\n');
 529
 530         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 531         if (test_bit(EV_KEY, dev->evbit))
 532                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 533         if (test_bit(EV_REL, dev->evbit))
 534                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 535         if (test_bit(EV_ABS, dev->evbit))
 536                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 537         if (test_bit(EV_MSC, dev->evbit))
 538                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 539         if (test_bit(EV_LED, dev->evbit))
 540                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 541         if (test_bit(EV_SND, dev->evbit))
 542                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 543         if (test_bit(EV_FF, dev->evbit))
 544                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 545         if (test_bit(EV_SW, dev->evbit))
 546                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 547
 548         seq_putc(seq, '\n');
 549
 550         kfree(path);
 551         return 0;
 552 }
 553
 554 static struct seq_operations input_devices_seq_ops = {
 555         .start  = input_devices_seq_start,
 556         .next   = input_devices_seq_next,
 557         .stop   = input_devices_seq_stop,
 558         .show   = input_devices_seq_show,
 559 };
 560
 561 static int input_proc_devices_open(struct inode *inode, struct file *file)
 562 {
 563         return seq_open(file, &input_devices_seq_ops);
 564 }
 565
 566 static const struct file_operations input_devices_fileops = {
 567         .owner          = THIS_MODULE,
 568         .open           = input_proc_devices_open,
 569         .poll           = input_proc_devices_poll,
 570         .read           = seq_read,
 571         .llseek         = seq_lseek,
 572         .release        = seq_release,
 573 };
 574
 575 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 576 {
 577         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 578         seq->private = (void *)(unsigned long)*pos;
 579         return list_get_nth_element(&input_handler_list, pos);
 580 }
 581
 582 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 583 {
 584         seq->private = (void *)(unsigned long)(*pos + 1);
 585         return list_get_next_element(&input_handler_list, v, pos);
 586 }
 587
 588 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 589 {
 590         /* release lock here */
 591 }
 592
 593 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 594 {
 595         struct input_handler *handler = container_of(v, struct input_handler, node);
 596
 597         seq_printf(seq, "N: Number=%ld Name=%s",
 598                    (unsigned long)seq->private, handler->name);
 599         if (handler->fops)
 600                 seq_printf(seq, " Minor=%d", handler->minor);
 601         seq_putc(seq, '\n');
 602
 603         return 0;
 604 }
 605 static struct seq_operations input_handlers_seq_ops = {
 606         .start  = input_handlers_seq_start,
 607         .next   = input_handlers_seq_next,
 608         .stop   = input_handlers_seq_stop,
 609         .show   = input_handlers_seq_show,
 610 };
 611
 612 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 613 {
 614         return seq_open(file, &input_handlers_seq_ops);
 615 }
 616
 617 static const struct file_operations input_handlers_fileops = {
 618         .owner          = THIS_MODULE,
 619         .open           = input_proc_handlers_open,
 620         .read           = seq_read,
 621         .llseek         = seq_lseek,
 622         .release        = seq_release,
 623 };
 624
 625 static int __init input_proc_init(void)
 626 {
 627         struct proc_dir_entry *entry;
 628
 629         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 630         if (!proc_bus_input_dir)
 631                 return -ENOMEM;
 632
 633         proc_bus_input_dir->owner = THIS_MODULE;
 634
 635         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 636         if (!entry)
 637                 goto fail1;
 638
 639         entry->owner = THIS_MODULE;
 640         entry->proc_fops = &input_devices_fileops;
 641
 642         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 643         if (!entry)
 644                 goto fail2;
 645
 646         entry->owner = THIS_MODULE;
 647         entry->proc_fops = &input_handlers_fileops;
 648
 649         return 0;
 650
 651  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 652  fail1: remove_proc_entry("input", proc_bus);
 653         return -ENOMEM;
 654 }
 655
 656 static void input_proc_exit(void)
 657 {
 658         remove_proc_entry("devices", proc_bus_input_dir);
 659         remove_proc_entry("handlers", proc_bus_input_dir);
 660         remove_proc_entry("input", proc_bus);
 661 }
 662
 663 #else /* !CONFIG_PROC_FS */
 664 static inline void input_wakeup_procfs_readers(void) { }
 665 static inline int input_proc_init(void) { return 0; }
 666 static inline void input_proc_exit(void) { }
 667 #endif
 668
 669 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
 670 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
 671 {                                                                               \
 672         struct input_dev *input_dev = to_input_dev(dev);                        \
 673                                                                                 \
 674         return scnprintf(buf, PAGE_SIZE, "%s\n",                                \
 675                          input_dev->name ? input_dev->name : "");               \
 676 }                                                                               \
 677 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
 678
 679 INPUT_DEV_STRING_ATTR_SHOW(name);
 680 INPUT_DEV_STRING_ATTR_SHOW(phys);
 681 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 682
 683 static int input_print_modalias_bits(char *buf, int size,
 684                                      char name, unsigned long *bm,
 685                                      unsigned int min_bit, unsigned int max_bit)
 686 {
 687         int len = 0, i;
 688
 689         len += snprintf(buf, max(size, 0), "%c", name);
 690         for (i = min_bit; i < max_bit; i++)
 691                 if (bm[LONG(i)] & BIT(i))
 692                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 693         return len;
 694 }
 695
 696 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 697                                 int add_cr)
 698 {
 699         int len;
 700
 701         len = snprintf(buf, max(size, 0),
 702                        "input:b%04Xv%04Xp%04Xe%04X-",
 703                        id->id.bustype, id->id.vendor,
 704                        id->id.product, id->id.version);
 705
 706         len += input_print_modalias_bits(buf + len, size - len,
 707                                 'e', id->evbit, 0, EV_MAX);
 708         len += input_print_modalias_bits(buf + len, size - len,
 709                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 710         len += input_print_modalias_bits(buf + len, size - len,
 711                                 'r', id->relbit, 0, REL_MAX);
 712         len += input_print_modalias_bits(buf + len, size - len,
 713                                 'a', id->absbit, 0, ABS_MAX);
 714         len += input_print_modalias_bits(buf + len, size - len,
 715                                 'm', id->mscbit, 0, MSC_MAX);
 716         len += input_print_modalias_bits(buf + len, size - len,
 717                                 'l', id->ledbit, 0, LED_MAX);
 718         len += input_print_modalias_bits(buf + len, size - len,
 719                                 's', id->sndbit, 0, SND_MAX);
 720         len += input_print_modalias_bits(buf + len, size - len,
 721                                 'f', id->ffbit, 0, FF_MAX);
 722         len += input_print_modalias_bits(buf + len, size - len,
 723                                 'w', id->swbit, 0, SW_MAX);
 724
 725         if (add_cr)
 726                 len += snprintf(buf + len, max(size - len, 0), "\n");
 727
 728         return len;
 729 }
 730
 731 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
 732 {
 733         struct input_dev *id = to_input_dev(dev);
 734         ssize_t len;
 735
 736         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 737
 738         return min_t(int, len, PAGE_SIZE);
 739 }
 740 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 741
 742 static struct attribute *input_dev_attrs[] = {
 743         &class_device_attr_name.attr,
 744         &class_device_attr_phys.attr,
 745         &class_device_attr_uniq.attr,
 746         &class_device_attr_modalias.attr,
 747         NULL
 748 };
 749
 750 static struct attribute_group input_dev_attr_group = {
 751         .attrs  = input_dev_attrs,
 752 };
 753
 754 #define INPUT_DEV_ID_ATTR(name)                                                 \
 755 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
 756 {                                                                               \
 757         struct input_dev *input_dev = to_input_dev(dev);                        \
 758         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
 759 }                                                                               \
 760 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
 761
 762 INPUT_DEV_ID_ATTR(bustype);
 763 INPUT_DEV_ID_ATTR(vendor);
 764 INPUT_DEV_ID_ATTR(product);
 765 INPUT_DEV_ID_ATTR(version);
 766
 767 static struct attribute *input_dev_id_attrs[] = {
 768         &class_device_attr_bustype.attr,
 769         &class_device_attr_vendor.attr,
 770         &class_device_attr_product.attr,
 771         &class_device_attr_version.attr,
 772         NULL
 773 };
 774
 775 static struct attribute_group input_dev_id_attr_group = {
 776         .name   = "id",
 777         .attrs  = input_dev_id_attrs,
 778 };
 779
 780 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 781                               int max, int add_cr)
 782 {
 783         int i;
 784         int len = 0;
 785
 786         for (i = NBITS(max) - 1; i > 0; i--)
 787                 if (bitmap[i])
 788                         break;
 789
 790         for (; i >= 0; i--)
 791                 len += snprintf(buf + len, max(buf_size - len, 0),
 792                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 793
 794         if (add_cr)
 795                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 796
 797         return len;
 798 }
 799
 800 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
 801 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
 802 {                                                                               \
 803         struct input_dev *input_dev = to_input_dev(dev);                        \
 804         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
 805                                      input_dev->bm##bit, ev##_MAX, 1);          \
 806         return min_t(int, len, PAGE_SIZE);                                      \
 807 }                                                                               \
 808 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
 809
 810 INPUT_DEV_CAP_ATTR(EV, ev);
 811 INPUT_DEV_CAP_ATTR(KEY, key);
 812 INPUT_DEV_CAP_ATTR(REL, rel);
 813 INPUT_DEV_CAP_ATTR(ABS, abs);
 814 INPUT_DEV_CAP_ATTR(MSC, msc);
 815 INPUT_DEV_CAP_ATTR(LED, led);
 816 INPUT_DEV_CAP_ATTR(SND, snd);
 817 INPUT_DEV_CAP_ATTR(FF, ff);
 818 INPUT_DEV_CAP_ATTR(SW, sw);
 819
 820 static struct attribute *input_dev_caps_attrs[] = {
 821         &class_device_attr_ev.attr,
 822         &class_device_attr_key.attr,
 823         &class_device_attr_rel.attr,
 824         &class_device_attr_abs.attr,
 825         &class_device_attr_msc.attr,
 826         &class_device_attr_led.attr,
 827         &class_device_attr_snd.attr,
 828         &class_device_attr_ff.attr,
 829         &class_device_attr_sw.attr,
 830         NULL
 831 };
 832
 833 static struct attribute_group input_dev_caps_attr_group = {
 834         .name   = "capabilities",
 835         .attrs  = input_dev_caps_attrs,
 836 };
 837
 838 static struct attribute_group *input_dev_attr_groups[] = {
 839         &input_dev_attr_group,
 840         &input_dev_id_attr_group,
 841         &input_dev_caps_attr_group,
 842         NULL
 843 };
 844
 845 static void input_dev_release(struct class_device *class_dev)
 846 {
 847         struct input_dev *dev = to_input_dev(class_dev);
 848
 849         input_ff_destroy(dev);
 850         kfree(dev);
 851
 852         module_put(THIS_MODULE);
 853 }
 854
 855 /*
 856  * Input uevent interface - loading event handlers based on
 857  * device bitfields.
 858  */
 859 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
 860                                    char *buffer, int buffer_size, int *cur_len,
 861                                    const char *name, unsigned long *bitmap, int max)
 862 {
 863         if (*cur_index >= num_envp - 1)
 864                 return -ENOMEM;
 865
 866         envp[*cur_index] = buffer + *cur_len;
 867
 868         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
 869         if (*cur_len >= buffer_size)
 870                 return -ENOMEM;
 871
 872         *cur_len += input_print_bitmap(buffer + *cur_len,
 873                                         max(buffer_size - *cur_len, 0),
 874                                         bitmap, max, 0) + 1;
 875         if (*cur_len > buffer_size)
 876                 return -ENOMEM;
 877
 878         (*cur_index)++;
 879         return 0;
 880 }
 881
 882 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
 883                                          char *buffer, int buffer_size, int *cur_len,
 884                                          struct input_dev *dev)
 885 {
 886         if (*cur_index >= num_envp - 1)
 887                 return -ENOMEM;
 888
 889         envp[*cur_index] = buffer + *cur_len;
 890
 891         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
 892                              "MODALIAS=");
 893         if (*cur_len >= buffer_size)
 894                 return -ENOMEM;
 895
 896         *cur_len += input_print_modalias(buffer + *cur_len,
 897                                          max(buffer_size - *cur_len, 0),
 898                                          dev, 0) + 1;
 899         if (*cur_len > buffer_size)
 900                 return -ENOMEM;
 901
 902         (*cur_index)++;
 903         return 0;
 904 }
 905
 906 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 907         do {                                                            \
 908                 int err = add_uevent_var(envp, num_envp, &i,            \
 909                                         buffer, buffer_size, &len,      \
 910                                         fmt, val);                      \
 911                 if (err)                                                \
 912                         return err;                                     \
 913         } while (0)
 914
 915 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 916         do {                                                            \
 917                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
 918                                         buffer, buffer_size, &len,      \
 919                                         name, bm, max);                 \
 920                 if (err)                                                \
 921                         return err;                                     \
 922         } while (0)
 923
 924 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 925         do {                                                            \
 926                 int err = input_add_uevent_modalias_var(envp,           \
 927                                         num_envp, &i,                   \
 928                                         buffer, buffer_size, &len,      \
 929                                         dev);                           \
 930                 if (err)                                                \
 931                         return err;                                     \
 932         } while (0)
 933
 934 static int input_dev_uevent(struct class_device *cdev, char **envp,
 935                             int num_envp, char *buffer, int buffer_size)
 936 {
 937         struct input_dev *dev = to_input_dev(cdev);
 938         int i = 0;
 939         int len = 0;
 940
 941         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 942                                 dev->id.bustype, dev->id.vendor,
 943                                 dev->id.product, dev->id.version);
 944         if (dev->name)
 945                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 946         if (dev->phys)
 947                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 948         if (dev->uniq)
 949                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 950
 951         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 952         if (test_bit(EV_KEY, dev->evbit))
 953                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 954         if (test_bit(EV_REL, dev->evbit))
 955                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 956         if (test_bit(EV_ABS, dev->evbit))
 957                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 958         if (test_bit(EV_MSC, dev->evbit))
 959                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 960         if (test_bit(EV_LED, dev->evbit))
 961                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 962         if (test_bit(EV_SND, dev->evbit))
 963                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 964         if (test_bit(EV_FF, dev->evbit))
 965                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 966         if (test_bit(EV_SW, dev->evbit))
 967                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 968
 969         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 970
 971         envp[i] = NULL;
 972         return 0;
 973 }
 974
 975 struct class input_class = {
 976         .name                   = "input",
 977         .release                = input_dev_release,
 978         .uevent                 = input_dev_uevent,
 979 };
 980 EXPORT_SYMBOL_GPL(input_class);
 981
 982 /**
 983  * input_allocate_device - allocate memory for new input device
 984  *
 985  * Returns prepared struct input_dev or NULL.
 986  *
 987  * NOTE: Use input_free_device() to free devices that have not been
 988  * registered; input_unregister_device() should be used for already
 989  * registered devices.
 990  */
 991 struct input_dev *input_allocate_device(void)
 992 {
 993         struct input_dev *dev;
 994
 995         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 996         if (dev) {
 997                 dev->cdev.class = &input_class;
 998                 dev->cdev.groups = input_dev_attr_groups;
 999                 class_device_initialize(&dev->cdev);
1000                 mutex_init(&dev->mutex);
1001                 INIT_LIST_HEAD(&dev->h_list);
1002                 INIT_LIST_HEAD(&dev->node);
1003
1004                 __module_get(THIS_MODULE);
1005         }
1006
1007         return dev;
1008 }
1009 EXPORT_SYMBOL(input_allocate_device);
1010
1011 /**
1012  * input_free_device - free memory occupied by input_dev structure
1013  * @dev: input device to free
1014  *
1015  * This function should only be used if input_register_device()
1016  * was not called yet or if it failed. Once device was registered
1017  * use input_unregister_device() and memory will be freed once last
1018  * refrence to the device is dropped.
1019  *
1020  * Device should be allocated by input_allocate_device().
1021  *
1022  * NOTE: If there are references to the input device then memory
1023  * will not be freed until last reference is dropped.
1024  */
1025 void input_free_device(struct input_dev *dev)
1026 {
1027         if (dev)
1028                 input_put_device(dev);
1029 }
1030 EXPORT_SYMBOL(input_free_device);
1031
1032 int input_register_device(struct input_dev *dev)
1033 {
1034         static atomic_t input_no = ATOMIC_INIT(0);
1035         struct input_handle *handle;
1036         struct input_handler *handler;
1037         const struct input_device_id *id;
1038         const char *path;
1039         int error;
1040
1041         set_bit(EV_SYN, dev->evbit);
1042
1043         /*
1044          * If delay and period are pre-set by the driver, then autorepeating
1045          * is handled by the driver itself and we don't do it in input.c.
1046          */
1047
1048         init_timer(&dev->timer);
1049         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1050                 dev->timer.data = (long) dev;
1051                 dev->timer.function = input_repeat_key;
1052                 dev->rep[REP_DELAY] = 250;
1053                 dev->rep[REP_PERIOD] = 33;
1054         }
1055
1056         if (!dev->getkeycode)
1057                 dev->getkeycode = input_default_getkeycode;
1058
1059         if (!dev->setkeycode)
1060                 dev->setkeycode = input_default_setkeycode;
1061
1062         list_add_tail(&dev->node, &input_dev_list);
1063
1064         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
1065                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1066
1067         error = class_device_add(&dev->cdev);
1068         if (error)
1069                 return error;
1070
1071         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1072         printk(KERN_INFO "input: %s as %s\n",
1073                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1074         kfree(path);
1075
1076         list_for_each_entry(handler, &input_handler_list, node)
1077                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1078                         if ((id = input_match_device(handler->id_table, dev)))
1079                                 if ((handle = handler->connect(handler, dev, id))) {
1080                                         input_link_handle(handle);
1081                                         if (handler->start)
1082                                                 handler->start(handle);
1083                                 }
1084
1085         input_wakeup_procfs_readers();
1086
1087         return 0;
1088 }
1089 EXPORT_SYMBOL(input_register_device);
1090
1091 void input_unregister_device(struct input_dev *dev)
1092 {
1093         struct list_head *node, *next;
1094         int code;
1095
1096         for (code = 0; code <= KEY_MAX; code++)
1097                 if (test_bit(code, dev->key))
1098                         input_report_key(dev, code, 0);
1099         input_sync(dev);
1100
1101         del_timer_sync(&dev->timer);
1102
1103         list_for_each_safe(node, next, &dev->h_list) {
1104                 struct input_handle * handle = to_handle(node);
1105                 list_del_init(&handle->d_node);
1106                 list_del_init(&handle->h_node);
1107                 handle->handler->disconnect(handle);
1108         }
1109
1110         list_del_init(&dev->node);
1111
1112         class_device_unregister(&dev->cdev);
1113
1114         input_wakeup_procfs_readers();
1115 }
1116 EXPORT_SYMBOL(input_unregister_device);
1117
1118 int input_register_handler(struct input_handler *handler)
1119 {
1120         struct input_dev *dev;
1121         struct input_handle *handle;
1122         const struct input_device_id *id;
1123
1124         INIT_LIST_HEAD(&handler->h_list);
1125
1126         if (handler->fops != NULL) {
1127                 if (input_table[handler->minor >> 5])
1128                         return -EBUSY;
1129
1130                 input_table[handler->minor >> 5] = handler;
1131         }
1132
1133         list_add_tail(&handler->node, &input_handler_list);
1134
1135         list_for_each_entry(dev, &input_dev_list, node)
1136                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1137                         if ((id = input_match_device(handler->id_table, dev)))
1138                                 if ((handle = handler->connect(handler, dev, id))) {
1139                                         input_link_handle(handle);
1140                                         if (handler->start)
1141                                                 handler->start(handle);
1142                                 }
1143
1144         input_wakeup_procfs_readers();
1145         return 0;
1146 }
1147 EXPORT_SYMBOL(input_register_handler);
1148
1149 void input_unregister_handler(struct input_handler *handler)
1150 {
1151         struct list_head *node, *next;
1152
1153         list_for_each_safe(node, next, &handler->h_list) {
1154                 struct input_handle * handle = to_handle_h(node);
1155                 list_del_init(&handle->h_node);
1156                 list_del_init(&handle->d_node);
1157                 handler->disconnect(handle);
1158         }
1159
1160         list_del_init(&handler->node);
1161
1162         if (handler->fops != NULL)
1163                 input_table[handler->minor >> 5] = NULL;
1164
1165         input_wakeup_procfs_readers();
1166 }
1167 EXPORT_SYMBOL(input_unregister_handler);
1168
1169 static int input_open_file(struct inode *inode, struct file *file)
1170 {
1171         struct input_handler *handler = input_table[iminor(inode) >> 5];
1172         const struct file_operations *old_fops, *new_fops = NULL;
1173         int err;
1174
1175         /* No load-on-demand here? */
1176         if (!handler || !(new_fops = fops_get(handler->fops)))
1177                 return -ENODEV;
1178
1179         /*
1180          * That's _really_ odd. Usually NULL ->open means "nothing special",
1181          * not "no device". Oh, well...
1182          */
1183         if (!new_fops->open) {
1184                 fops_put(new_fops);
1185                 return -ENODEV;
1186         }
1187         old_fops = file->f_op;
1188         file->f_op = new_fops;
1189
1190         err = new_fops->open(inode, file);
1191
1192         if (err) {
1193                 fops_put(file->f_op);
1194                 file->f_op = fops_get(old_fops);
1195         }
1196         fops_put(old_fops);
1197         return err;
1198 }
1199
1200 static const struct file_operations input_fops = {
1201         .owner = THIS_MODULE,
1202         .open = input_open_file,
1203 };
1204
1205 static int __init input_init(void)
1206 {
1207         int err;
1208
1209         err = class_register(&input_class);
1210         if (err) {
1211                 printk(KERN_ERR "input: unable to register input_dev class\n");
1212                 return err;
1213         }
1214
1215         err = input_proc_init();
1216         if (err)
1217                 goto fail1;
1218
1219         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1220         if (err) {
1221                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1222                 goto fail2;
1223         }
1224
1225         return 0;
1226
1227  fail2: input_proc_exit();
1228  fail1: class_unregister(&input_class);
1229         return err;
1230 }
1231
1232 static void __exit input_exit(void)
1233 {
1234         input_proc_exit();
1235         unregister_chrdev(INPUT_MAJOR, "input");
1236         class_unregister(&input_class);
1237 }
1238
1239 subsys_initcall(input_init);
1240 module_exit(input_exit);