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/input.h>
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/major.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/poll.h>
  22 #include <linux/device.h>
  23 #include <linux/mutex.h>
  24
  25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  26 MODULE_DESCRIPTION("Input core");
  27 MODULE_LICENSE("GPL");
  28
  29 #define INPUT_DEVICES   256
  30
  31 static LIST_HEAD(input_dev_list);
  32 static LIST_HEAD(input_handler_list);
  33
  34 static struct input_handler *input_table[8];
  35
  36 /**
  37  * input_event() - report new input event
  38  * @dev: device that generated the event
  39  * @type: type of the event
  40  * @code: event code
  41  * @value: value of the event
  42  *
  43  * This function should be used by drivers implementing various input devices
  44  * See also input_inject_event()
  45  */
  46 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  47 {
  48         struct input_handle *handle;
  49
  50         if (type > EV_MAX || !test_bit(type, dev->evbit))
  51                 return;
  52
  53         add_input_randomness(type, code, value);
  54
  55         switch (type) {
  56
  57                 case EV_SYN:
  58                         switch (code) {
  59                                 case SYN_CONFIG:
  60                                         if (dev->event)
  61                                                 dev->event(dev, type, code, value);
  62                                         break;
  63
  64                                 case SYN_REPORT:
  65                                         if (dev->sync)
  66                                                 return;
  67                                         dev->sync = 1;
  68                                         break;
  69                         }
  70                         break;
  71
  72                 case EV_KEY:
  73
  74                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
  75                                 return;
  76
  77                         if (value == 2)
  78                                 break;
  79
  80                         change_bit(code, dev->key);
  81
  82                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
  83                                 dev->repeat_key = code;
  84                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  85                         }
  86
  87                         break;
  88
  89                 case EV_SW:
  90
  91                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
  92                                 return;
  93
  94                         change_bit(code, dev->sw);
  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)
 136                                 dev->event(dev, type, code, value);
 137
 138                         break;
 139
 140                 case EV_LED:
 141
 142                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
 143                                 return;
 144
 145                         change_bit(code, dev->led);
 146
 147                         if (dev->event)
 148                                 dev->event(dev, type, code, value);
 149
 150                         break;
 151
 152                 case EV_SND:
 153
 154                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
 155                                 return;
 156
 157                         if (!!test_bit(code, dev->snd) != !!value)
 158                                 change_bit(code, dev->snd);
 159
 160                         if (dev->event)
 161                                 dev->event(dev, type, code, value);
 162
 163                         break;
 164
 165                 case EV_REP:
 166
 167                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
 168                                 return;
 169
 170                         dev->rep[code] = value;
 171                         if (dev->event)
 172                                 dev->event(dev, type, code, value);
 173
 174                         break;
 175
 176                 case EV_FF:
 177
 178                         if (value < 0)
 179                                 return;
 180
 181                         if (dev->event)
 182                                 dev->event(dev, type, code, value);
 183                         break;
 184         }
 185
 186         if (type != EV_SYN)
 187                 dev->sync = 0;
 188
 189         if (dev->grab)
 190                 dev->grab->handler->event(dev->grab, type, code, value);
 191         else
 192                 list_for_each_entry(handle, &dev->h_list, d_node)
 193                         if (handle->open)
 194                                 handle->handler->event(handle, type, code, value);
 195 }
 196 EXPORT_SYMBOL(input_event);
 197
 198 /**
 199  * input_inject_event() - send input event from input handler
 200  * @handle: input handle to send event through
 201  * @type: type of the event
 202  * @code: event code
 203  * @value: value of the event
 204  *
 205  * Similar to input_event() but will ignore event if device is "grabbed" and handle
 206  * injecting event is not the one that owns the device.
 207  */
 208 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 209 {
 210         if (!handle->dev->grab || handle->dev->grab == handle)
 211                 input_event(handle->dev, type, code, value);
 212 }
 213 EXPORT_SYMBOL(input_inject_event);
 214
 215 static void input_repeat_key(unsigned long data)
 216 {
 217         struct input_dev *dev = (void *) data;
 218
 219         if (!test_bit(dev->repeat_key, dev->key))
 220                 return;
 221
 222         input_event(dev, EV_KEY, dev->repeat_key, 2);
 223         input_sync(dev);
 224
 225         if (dev->rep[REP_PERIOD])
 226                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
 227 }
 228
 229 int input_grab_device(struct input_handle *handle)
 230 {
 231         if (handle->dev->grab)
 232                 return -EBUSY;
 233
 234         handle->dev->grab = handle;
 235         return 0;
 236 }
 237 EXPORT_SYMBOL(input_grab_device);
 238
 239 void input_release_device(struct input_handle *handle)
 240 {
 241         struct input_dev *dev = handle->dev;
 242
 243         if (dev->grab == handle) {
 244                 dev->grab = NULL;
 245
 246                 list_for_each_entry(handle, &dev->h_list, d_node)
 247                         if (handle->handler->start)
 248                                 handle->handler->start(handle);
 249         }
 250 }
 251 EXPORT_SYMBOL(input_release_device);
 252
 253 int input_open_device(struct input_handle *handle)
 254 {
 255         struct input_dev *dev = handle->dev;
 256         int err;
 257
 258         err = mutex_lock_interruptible(&dev->mutex);
 259         if (err)
 260                 return err;
 261
 262         handle->open++;
 263
 264         if (!dev->users++ && dev->open)
 265                 err = dev->open(dev);
 266
 267         if (err)
 268                 handle->open--;
 269
 270         mutex_unlock(&dev->mutex);
 271
 272         return err;
 273 }
 274 EXPORT_SYMBOL(input_open_device);
 275
 276 int input_flush_device(struct input_handle* handle, struct file* file)
 277 {
 278         if (handle->dev->flush)
 279                 return handle->dev->flush(handle->dev, file);
 280
 281         return 0;
 282 }
 283 EXPORT_SYMBOL(input_flush_device);
 284
 285 void input_close_device(struct input_handle *handle)
 286 {
 287         struct input_dev *dev = handle->dev;
 288
 289         input_release_device(handle);
 290
 291         mutex_lock(&dev->mutex);
 292
 293         if (!--dev->users && dev->close)
 294                 dev->close(dev);
 295         handle->open--;
 296
 297         mutex_unlock(&dev->mutex);
 298 }
 299 EXPORT_SYMBOL(input_close_device);
 300
 301 static int input_fetch_keycode(struct input_dev *dev, int scancode)
 302 {
 303         switch (dev->keycodesize) {
 304                 case 1:
 305                         return ((u8 *)dev->keycode)[scancode];
 306
 307                 case 2:
 308                         return ((u16 *)dev->keycode)[scancode];
 309
 310                 default:
 311                         return ((u32 *)dev->keycode)[scancode];
 312         }
 313 }
 314
 315 static int input_default_getkeycode(struct input_dev *dev,
 316                                     int scancode, int *keycode)
 317 {
 318         if (!dev->keycodesize)
 319                 return -EINVAL;
 320
 321         if (scancode < 0 || scancode >= dev->keycodemax)
 322                 return -EINVAL;
 323
 324         *keycode = input_fetch_keycode(dev, scancode);
 325
 326         return 0;
 327 }
 328
 329 static int input_default_setkeycode(struct input_dev *dev,
 330                                     int scancode, int keycode)
 331 {
 332         int old_keycode;
 333         int i;
 334
 335         if (scancode < 0 || scancode >= dev->keycodemax)
 336                 return -EINVAL;
 337
 338         if (keycode < 0 || keycode > KEY_MAX)
 339                 return -EINVAL;
 340
 341         if (!dev->keycodesize)
 342                 return -EINVAL;
 343
 344         if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
 345                 return -EINVAL;
 346
 347         switch (dev->keycodesize) {
 348                 case 1: {
 349                         u8 *k = (u8 *)dev->keycode;
 350                         old_keycode = k[scancode];
 351                         k[scancode] = keycode;
 352                         break;
 353                 }
 354                 case 2: {
 355                         u16 *k = (u16 *)dev->keycode;
 356                         old_keycode = k[scancode];
 357                         k[scancode] = keycode;
 358                         break;
 359                 }
 360                 default: {
 361                         u32 *k = (u32 *)dev->keycode;
 362                         old_keycode = k[scancode];
 363                         k[scancode] = keycode;
 364                         break;
 365                 }
 366         }
 367
 368         clear_bit(old_keycode, dev->keybit);
 369         set_bit(keycode, dev->keybit);
 370
 371         for (i = 0; i < dev->keycodemax; i++) {
 372                 if (input_fetch_keycode(dev, i) == old_keycode) {
 373                         set_bit(old_keycode, dev->keybit);
 374                         break; /* Setting the bit twice is useless, so break */
 375                 }
 376         }
 377
 378         return 0;
 379 }
 380
 381
 382 #define MATCH_BIT(bit, max) \
 383                 for (i = 0; i < NBITS(max); i++) \
 384                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
 385                                 break; \
 386                 if (i != NBITS(max)) \
 387                         continue;
 388
 389 static const struct input_device_id *input_match_device(const struct input_device_id *id,
 390                                                         struct input_dev *dev)
 391 {
 392         int i;
 393
 394         for (; id->flags || id->driver_info; id++) {
 395
 396                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 397                         if (id->bustype != dev->id.bustype)
 398                                 continue;
 399
 400                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 401                         if (id->vendor != dev->id.vendor)
 402                                 continue;
 403
 404                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 405                         if (id->product != dev->id.product)
 406                                 continue;
 407
 408                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 409                         if (id->version != dev->id.version)
 410                                 continue;
 411
 412                 MATCH_BIT(evbit,  EV_MAX);
 413                 MATCH_BIT(keybit, KEY_MAX);
 414                 MATCH_BIT(relbit, REL_MAX);
 415                 MATCH_BIT(absbit, ABS_MAX);
 416                 MATCH_BIT(mscbit, MSC_MAX);
 417                 MATCH_BIT(ledbit, LED_MAX);
 418                 MATCH_BIT(sndbit, SND_MAX);
 419                 MATCH_BIT(ffbit,  FF_MAX);
 420                 MATCH_BIT(swbit,  SW_MAX);
 421
 422                 return id;
 423         }
 424
 425         return NULL;
 426 }
 427
 428 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
 429 {
 430         const struct input_device_id *id;
 431         int error;
 432
 433         if (handler->blacklist && input_match_device(handler->blacklist, dev))
 434                 return -ENODEV;
 435
 436         id = input_match_device(handler->id_table, dev);
 437         if (!id)
 438                 return -ENODEV;
 439
 440         error = handler->connect(handler, dev, id);
 441         if (error && error != -ENODEV)
 442                 printk(KERN_ERR
 443                         "input: failed to attach handler %s to device %s, "
 444                         "error: %d\n",
 445                         handler->name, kobject_name(&dev->dev.kobj), error);
 446
 447         return error;
 448 }
 449
 450
 451 #ifdef CONFIG_PROC_FS
 452
 453 static struct proc_dir_entry *proc_bus_input_dir;
 454 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
 455 static int input_devices_state;
 456
 457 static inline void input_wakeup_procfs_readers(void)
 458 {
 459         input_devices_state++;
 460         wake_up(&input_devices_poll_wait);
 461 }
 462
 463 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
 464 {
 465         int state = input_devices_state;
 466
 467         poll_wait(file, &input_devices_poll_wait, wait);
 468         if (state != input_devices_state)
 469                 return POLLIN | POLLRDNORM;
 470
 471         return 0;
 472 }
 473
 474 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
 475 {
 476         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 477
 478         return seq_list_start(&input_dev_list, *pos);
 479 }
 480
 481 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 482 {
 483         return seq_list_next(v, &input_dev_list, pos);
 484 }
 485
 486 static void input_devices_seq_stop(struct seq_file *seq, void *v)
 487 {
 488         /* release lock here */
 489 }
 490
 491 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
 492                                    unsigned long *bitmap, int max)
 493 {
 494         int i;
 495
 496         for (i = NBITS(max) - 1; i > 0; i--)
 497                 if (bitmap[i])
 498                         break;
 499
 500         seq_printf(seq, "B: %s=", name);
 501         for (; i >= 0; i--)
 502                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
 503         seq_putc(seq, '\n');
 504 }
 505
 506 static int input_devices_seq_show(struct seq_file *seq, void *v)
 507 {
 508         struct input_dev *dev = container_of(v, struct input_dev, node);
 509         const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
 510         struct input_handle *handle;
 511
 512         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
 513                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
 514
 515         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
 516         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
 517         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
 518         seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
 519         seq_printf(seq, "H: Handlers=");
 520
 521         list_for_each_entry(handle, &dev->h_list, d_node)
 522                 seq_printf(seq, "%s ", handle->name);
 523         seq_putc(seq, '\n');
 524
 525         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
 526         if (test_bit(EV_KEY, dev->evbit))
 527                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
 528         if (test_bit(EV_REL, dev->evbit))
 529                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
 530         if (test_bit(EV_ABS, dev->evbit))
 531                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
 532         if (test_bit(EV_MSC, dev->evbit))
 533                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
 534         if (test_bit(EV_LED, dev->evbit))
 535                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
 536         if (test_bit(EV_SND, dev->evbit))
 537                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
 538         if (test_bit(EV_FF, dev->evbit))
 539                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
 540         if (test_bit(EV_SW, dev->evbit))
 541                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
 542
 543         seq_putc(seq, '\n');
 544
 545         kfree(path);
 546         return 0;
 547 }
 548
 549 static struct seq_operations input_devices_seq_ops = {
 550         .start  = input_devices_seq_start,
 551         .next   = input_devices_seq_next,
 552         .stop   = input_devices_seq_stop,
 553         .show   = input_devices_seq_show,
 554 };
 555
 556 static int input_proc_devices_open(struct inode *inode, struct file *file)
 557 {
 558         return seq_open(file, &input_devices_seq_ops);
 559 }
 560
 561 static const struct file_operations input_devices_fileops = {
 562         .owner          = THIS_MODULE,
 563         .open           = input_proc_devices_open,
 564         .poll           = input_proc_devices_poll,
 565         .read           = seq_read,
 566         .llseek         = seq_lseek,
 567         .release        = seq_release,
 568 };
 569
 570 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
 571 {
 572         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
 573         seq->private = (void *)(unsigned long)*pos;
 574         return seq_list_start(&input_handler_list, *pos);
 575 }
 576
 577 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 578 {
 579         seq->private = (void *)(unsigned long)(*pos + 1);
 580         return seq_list_next(v, &input_handler_list, pos);
 581 }
 582
 583 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
 584 {
 585         /* release lock here */
 586 }
 587
 588 static int input_handlers_seq_show(struct seq_file *seq, void *v)
 589 {
 590         struct input_handler *handler = container_of(v, struct input_handler, node);
 591
 592         seq_printf(seq, "N: Number=%ld Name=%s",
 593                    (unsigned long)seq->private, handler->name);
 594         if (handler->fops)
 595                 seq_printf(seq, " Minor=%d", handler->minor);
 596         seq_putc(seq, '\n');
 597
 598         return 0;
 599 }
 600 static struct seq_operations input_handlers_seq_ops = {
 601         .start  = input_handlers_seq_start,
 602         .next   = input_handlers_seq_next,
 603         .stop   = input_handlers_seq_stop,
 604         .show   = input_handlers_seq_show,
 605 };
 606
 607 static int input_proc_handlers_open(struct inode *inode, struct file *file)
 608 {
 609         return seq_open(file, &input_handlers_seq_ops);
 610 }
 611
 612 static const struct file_operations input_handlers_fileops = {
 613         .owner          = THIS_MODULE,
 614         .open           = input_proc_handlers_open,
 615         .read           = seq_read,
 616         .llseek         = seq_lseek,
 617         .release        = seq_release,
 618 };
 619
 620 static int __init input_proc_init(void)
 621 {
 622         struct proc_dir_entry *entry;
 623
 624         proc_bus_input_dir = proc_mkdir("input", proc_bus);
 625         if (!proc_bus_input_dir)
 626                 return -ENOMEM;
 627
 628         proc_bus_input_dir->owner = THIS_MODULE;
 629
 630         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
 631         if (!entry)
 632                 goto fail1;
 633
 634         entry->owner = THIS_MODULE;
 635         entry->proc_fops = &input_devices_fileops;
 636
 637         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
 638         if (!entry)
 639                 goto fail2;
 640
 641         entry->owner = THIS_MODULE;
 642         entry->proc_fops = &input_handlers_fileops;
 643
 644         return 0;
 645
 646  fail2: remove_proc_entry("devices", proc_bus_input_dir);
 647  fail1: remove_proc_entry("input", proc_bus);
 648         return -ENOMEM;
 649 }
 650
 651 static void input_proc_exit(void)
 652 {
 653         remove_proc_entry("devices", proc_bus_input_dir);
 654         remove_proc_entry("handlers", proc_bus_input_dir);
 655         remove_proc_entry("input", proc_bus);
 656 }
 657
 658 #else /* !CONFIG_PROC_FS */
 659 static inline void input_wakeup_procfs_readers(void) { }
 660 static inline int input_proc_init(void) { return 0; }
 661 static inline void input_proc_exit(void) { }
 662 #endif
 663
 664 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                \
 665 static ssize_t input_dev_show_##name(struct device *dev,                \
 666                                      struct device_attribute *attr,     \
 667                                      char *buf)                         \
 668 {                                                                       \
 669         struct input_dev *input_dev = to_input_dev(dev);                \
 670                                                                         \
 671         return scnprintf(buf, PAGE_SIZE, "%s\n",                        \
 672                          input_dev->name ? input_dev->name : "");       \
 673 }                                                                       \
 674 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
 675
 676 INPUT_DEV_STRING_ATTR_SHOW(name);
 677 INPUT_DEV_STRING_ATTR_SHOW(phys);
 678 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 679
 680 static int input_print_modalias_bits(char *buf, int size,
 681                                      char name, unsigned long *bm,
 682                                      unsigned int min_bit, unsigned int max_bit)
 683 {
 684         int len = 0, i;
 685
 686         len += snprintf(buf, max(size, 0), "%c", name);
 687         for (i = min_bit; i < max_bit; i++)
 688                 if (bm[LONG(i)] & BIT(i))
 689                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
 690         return len;
 691 }
 692
 693 static int input_print_modalias(char *buf, int size, struct input_dev *id,
 694                                 int add_cr)
 695 {
 696         int len;
 697
 698         len = snprintf(buf, max(size, 0),
 699                        "input:b%04Xv%04Xp%04Xe%04X-",
 700                        id->id.bustype, id->id.vendor,
 701                        id->id.product, id->id.version);
 702
 703         len += input_print_modalias_bits(buf + len, size - len,
 704                                 'e', id->evbit, 0, EV_MAX);
 705         len += input_print_modalias_bits(buf + len, size - len,
 706                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
 707         len += input_print_modalias_bits(buf + len, size - len,
 708                                 'r', id->relbit, 0, REL_MAX);
 709         len += input_print_modalias_bits(buf + len, size - len,
 710                                 'a', id->absbit, 0, ABS_MAX);
 711         len += input_print_modalias_bits(buf + len, size - len,
 712                                 'm', id->mscbit, 0, MSC_MAX);
 713         len += input_print_modalias_bits(buf + len, size - len,
 714                                 'l', id->ledbit, 0, LED_MAX);
 715         len += input_print_modalias_bits(buf + len, size - len,
 716                                 's', id->sndbit, 0, SND_MAX);
 717         len += input_print_modalias_bits(buf + len, size - len,
 718                                 'f', id->ffbit, 0, FF_MAX);
 719         len += input_print_modalias_bits(buf + len, size - len,
 720                                 'w', id->swbit, 0, SW_MAX);
 721
 722         if (add_cr)
 723                 len += snprintf(buf + len, max(size - len, 0), "\n");
 724
 725         return len;
 726 }
 727
 728 static ssize_t input_dev_show_modalias(struct device *dev,
 729                                        struct device_attribute *attr,
 730                                        char *buf)
 731 {
 732         struct input_dev *id = to_input_dev(dev);
 733         ssize_t len;
 734
 735         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
 736
 737         return min_t(int, len, PAGE_SIZE);
 738 }
 739 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 740
 741 static struct attribute *input_dev_attrs[] = {
 742         &dev_attr_name.attr,
 743         &dev_attr_phys.attr,
 744         &dev_attr_uniq.attr,
 745         &dev_attr_modalias.attr,
 746         NULL
 747 };
 748
 749 static struct attribute_group input_dev_attr_group = {
 750         .attrs  = input_dev_attrs,
 751 };
 752
 753 #define INPUT_DEV_ID_ATTR(name)                                         \
 754 static ssize_t input_dev_show_id_##name(struct device *dev,             \
 755                                         struct device_attribute *attr,  \
 756                                         char *buf)                      \
 757 {                                                                       \
 758         struct input_dev *input_dev = to_input_dev(dev);                \
 759         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
 760 }                                                                       \
 761 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
 762
 763 INPUT_DEV_ID_ATTR(bustype);
 764 INPUT_DEV_ID_ATTR(vendor);
 765 INPUT_DEV_ID_ATTR(product);
 766 INPUT_DEV_ID_ATTR(version);
 767
 768 static struct attribute *input_dev_id_attrs[] = {
 769         &dev_attr_bustype.attr,
 770         &dev_attr_vendor.attr,
 771         &dev_attr_product.attr,
 772         &dev_attr_version.attr,
 773         NULL
 774 };
 775
 776 static struct attribute_group input_dev_id_attr_group = {
 777         .name   = "id",
 778         .attrs  = input_dev_id_attrs,
 779 };
 780
 781 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
 782                               int max, int add_cr)
 783 {
 784         int i;
 785         int len = 0;
 786
 787         for (i = NBITS(max) - 1; i > 0; i--)
 788                 if (bitmap[i])
 789                         break;
 790
 791         for (; i >= 0; i--)
 792                 len += snprintf(buf + len, max(buf_size - len, 0),
 793                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
 794
 795         if (add_cr)
 796                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
 797
 798         return len;
 799 }
 800
 801 #define INPUT_DEV_CAP_ATTR(ev, bm)                                      \
 802 static ssize_t input_dev_show_cap_##bm(struct device *dev,              \
 803                                        struct device_attribute *attr,   \
 804                                        char *buf)                       \
 805 {                                                                       \
 806         struct input_dev *input_dev = to_input_dev(dev);                \
 807         int len = input_print_bitmap(buf, PAGE_SIZE,                    \
 808                                      input_dev->bm##bit, ev##_MAX, 1);  \
 809         return min_t(int, len, PAGE_SIZE);                              \
 810 }                                                                       \
 811 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
 812
 813 INPUT_DEV_CAP_ATTR(EV, ev);
 814 INPUT_DEV_CAP_ATTR(KEY, key);
 815 INPUT_DEV_CAP_ATTR(REL, rel);
 816 INPUT_DEV_CAP_ATTR(ABS, abs);
 817 INPUT_DEV_CAP_ATTR(MSC, msc);
 818 INPUT_DEV_CAP_ATTR(LED, led);
 819 INPUT_DEV_CAP_ATTR(SND, snd);
 820 INPUT_DEV_CAP_ATTR(FF, ff);
 821 INPUT_DEV_CAP_ATTR(SW, sw);
 822
 823 static struct attribute *input_dev_caps_attrs[] = {
 824         &dev_attr_ev.attr,
 825         &dev_attr_key.attr,
 826         &dev_attr_rel.attr,
 827         &dev_attr_abs.attr,
 828         &dev_attr_msc.attr,
 829         &dev_attr_led.attr,
 830         &dev_attr_snd.attr,
 831         &dev_attr_ff.attr,
 832         &dev_attr_sw.attr,
 833         NULL
 834 };
 835
 836 static struct attribute_group input_dev_caps_attr_group = {
 837         .name   = "capabilities",
 838         .attrs  = input_dev_caps_attrs,
 839 };
 840
 841 static struct attribute_group *input_dev_attr_groups[] = {
 842         &input_dev_attr_group,
 843         &input_dev_id_attr_group,
 844         &input_dev_caps_attr_group,
 845         NULL
 846 };
 847
 848 static void input_dev_release(struct device *device)
 849 {
 850         struct input_dev *dev = to_input_dev(device);
 851
 852         input_ff_destroy(dev);
 853         kfree(dev);
 854
 855         module_put(THIS_MODULE);
 856 }
 857
 858 /*
 859  * Input uevent interface - loading event handlers based on
 860  * device bitfields.
 861  */
 862 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
 863                                    const char *name, unsigned long *bitmap, int max)
 864 {
 865         int len;
 866
 867         if (add_uevent_var(env, "%s=", name))
 868                 return -ENOMEM;
 869
 870         len = input_print_bitmap(&env->buf[env->buflen - 1],
 871                                  sizeof(env->buf) - env->buflen,
 872                                  bitmap, max, 0);
 873         if (len >= (sizeof(env->buf) - env->buflen))
 874                 return -ENOMEM;
 875
 876         env->buflen += len;
 877         return 0;
 878 }
 879
 880 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
 881                                          struct input_dev *dev)
 882 {
 883         int len;
 884
 885         if (add_uevent_var(env, "MODALIAS="))
 886                 return -ENOMEM;
 887
 888         len = input_print_modalias(&env->buf[env->buflen - 1],
 889                                    sizeof(env->buf) - env->buflen,
 890                                    dev, 0);
 891         if (len >= (sizeof(env->buf) - env->buflen))
 892                 return -ENOMEM;
 893
 894         env->buflen += len;
 895         return 0;
 896 }
 897
 898 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
 899         do {                                                            \
 900                 int err = add_uevent_var(env, fmt, val);                \
 901                 if (err)                                                \
 902                         return err;                                     \
 903         } while (0)
 904
 905 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
 906         do {                                                            \
 907                 int err = input_add_uevent_bm_var(env, name, bm, max);  \
 908                 if (err)                                                \
 909                         return err;                                     \
 910         } while (0)
 911
 912 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
 913         do {                                                            \
 914                 int err = input_add_uevent_modalias_var(env, dev);      \
 915                 if (err)                                                \
 916                         return err;                                     \
 917         } while (0)
 918
 919 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
 920 {
 921         struct input_dev *dev = to_input_dev(device);
 922
 923         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 924                                 dev->id.bustype, dev->id.vendor,
 925                                 dev->id.product, dev->id.version);
 926         if (dev->name)
 927                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
 928         if (dev->phys)
 929                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
 930         if (dev->uniq)
 931                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
 932
 933         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
 934         if (test_bit(EV_KEY, dev->evbit))
 935                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
 936         if (test_bit(EV_REL, dev->evbit))
 937                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
 938         if (test_bit(EV_ABS, dev->evbit))
 939                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
 940         if (test_bit(EV_MSC, dev->evbit))
 941                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
 942         if (test_bit(EV_LED, dev->evbit))
 943                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
 944         if (test_bit(EV_SND, dev->evbit))
 945                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
 946         if (test_bit(EV_FF, dev->evbit))
 947                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
 948         if (test_bit(EV_SW, dev->evbit))
 949                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
 950
 951         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
 952
 953         return 0;
 954 }
 955
 956 static struct device_type input_dev_type = {
 957         .groups         = input_dev_attr_groups,
 958         .release        = input_dev_release,
 959         .uevent         = input_dev_uevent,
 960 };
 961
 962 struct class input_class = {
 963         .name           = "input",
 964 };
 965 EXPORT_SYMBOL_GPL(input_class);
 966
 967 /**
 968  * input_allocate_device - allocate memory for new input device
 969  *
 970  * Returns prepared struct input_dev or NULL.
 971  *
 972  * NOTE: Use input_free_device() to free devices that have not been
 973  * registered; input_unregister_device() should be used for already
 974  * registered devices.
 975  */
 976 struct input_dev *input_allocate_device(void)
 977 {
 978         struct input_dev *dev;
 979
 980         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
 981         if (dev) {
 982                 dev->dev.type = &input_dev_type;
 983                 dev->dev.class = &input_class;
 984                 device_initialize(&dev->dev);
 985                 mutex_init(&dev->mutex);
 986                 INIT_LIST_HEAD(&dev->h_list);
 987                 INIT_LIST_HEAD(&dev->node);
 988
 989                 __module_get(THIS_MODULE);
 990         }
 991
 992         return dev;
 993 }
 994 EXPORT_SYMBOL(input_allocate_device);
 995
 996 /**
 997  * input_free_device - free memory occupied by input_dev structure
 998  * @dev: input device to free
 999  *
1000  * This function should only be used if input_register_device()
1001  * was not called yet or if it failed. Once device was registered
1002  * use input_unregister_device() and memory will be freed once last
1003  * refrence to the device is dropped.
1004  *
1005  * Device should be allocated by input_allocate_device().
1006  *
1007  * NOTE: If there are references to the input device then memory
1008  * will not be freed until last reference is dropped.
1009  */
1010 void input_free_device(struct input_dev *dev)
1011 {
1012         if (dev)
1013                 input_put_device(dev);
1014 }
1015 EXPORT_SYMBOL(input_free_device);
1016
1017 /**
1018  * input_set_capability - mark device as capable of a certain event
1019  * @dev: device that is capable of emitting or accepting event
1020  * @type: type of the event (EV_KEY, EV_REL, etc...)
1021  * @code: event code
1022  *
1023  * In addition to setting up corresponding bit in appropriate capability
1024  * bitmap the function also adjusts dev->evbit.
1025  */
1026 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1027 {
1028         switch (type) {
1029         case EV_KEY:
1030                 __set_bit(code, dev->keybit);
1031                 break;
1032
1033         case EV_REL:
1034                 __set_bit(code, dev->relbit);
1035                 break;
1036
1037         case EV_ABS:
1038                 __set_bit(code, dev->absbit);
1039                 break;
1040
1041         case EV_MSC:
1042                 __set_bit(code, dev->mscbit);
1043                 break;
1044
1045         case EV_SW:
1046                 __set_bit(code, dev->swbit);
1047                 break;
1048
1049         case EV_LED:
1050                 __set_bit(code, dev->ledbit);
1051                 break;
1052
1053         case EV_SND:
1054                 __set_bit(code, dev->sndbit);
1055                 break;
1056
1057         case EV_FF:
1058                 __set_bit(code, dev->ffbit);
1059                 break;
1060
1061         default:
1062                 printk(KERN_ERR
1063                         "input_set_capability: unknown type %u (code %u)\n",
1064                         type, code);
1065                 dump_stack();
1066                 return;
1067         }
1068
1069         __set_bit(type, dev->evbit);
1070 }
1071 EXPORT_SYMBOL(input_set_capability);
1072
1073 int input_register_device(struct input_dev *dev)
1074 {
1075         static atomic_t input_no = ATOMIC_INIT(0);
1076         struct input_handler *handler;
1077         const char *path;
1078         int error;
1079
1080         set_bit(EV_SYN, dev->evbit);
1081
1082         /*
1083          * If delay and period are pre-set by the driver, then autorepeating
1084          * is handled by the driver itself and we don't do it in input.c.
1085          */
1086
1087         init_timer(&dev->timer);
1088         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1089                 dev->timer.data = (long) dev;
1090                 dev->timer.function = input_repeat_key;
1091                 dev->rep[REP_DELAY] = 250;
1092                 dev->rep[REP_PERIOD] = 33;
1093         }
1094
1095         if (!dev->getkeycode)
1096                 dev->getkeycode = input_default_getkeycode;
1097
1098         if (!dev->setkeycode)
1099                 dev->setkeycode = input_default_setkeycode;
1100
1101         list_add_tail(&dev->node, &input_dev_list);
1102
1103         snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
1104                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1105
1106         if (dev->cdev.dev)
1107                 dev->dev.parent = dev->cdev.dev;
1108
1109         error = device_add(&dev->dev);
1110         if (error)
1111                 return error;
1112
1113         path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1114         printk(KERN_INFO "input: %s as %s\n",
1115                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1116         kfree(path);
1117
1118         list_for_each_entry(handler, &input_handler_list, node)
1119                 input_attach_handler(dev, handler);
1120
1121         input_wakeup_procfs_readers();
1122
1123         return 0;
1124 }
1125 EXPORT_SYMBOL(input_register_device);
1126
1127 void input_unregister_device(struct input_dev *dev)
1128 {
1129         struct input_handle *handle, *next;
1130         int code;
1131
1132         for (code = 0; code <= KEY_MAX; code++)
1133                 if (test_bit(code, dev->key))
1134                         input_report_key(dev, code, 0);
1135         input_sync(dev);
1136
1137         del_timer_sync(&dev->timer);
1138
1139         list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1140                 handle->handler->disconnect(handle);
1141         WARN_ON(!list_empty(&dev->h_list));
1142
1143         list_del_init(&dev->node);
1144
1145         device_unregister(&dev->dev);
1146
1147         input_wakeup_procfs_readers();
1148 }
1149 EXPORT_SYMBOL(input_unregister_device);
1150
1151 int input_register_handler(struct input_handler *handler)
1152 {
1153         struct input_dev *dev;
1154
1155         INIT_LIST_HEAD(&handler->h_list);
1156
1157         if (handler->fops != NULL) {
1158                 if (input_table[handler->minor >> 5])
1159                         return -EBUSY;
1160
1161                 input_table[handler->minor >> 5] = handler;
1162         }
1163
1164         list_add_tail(&handler->node, &input_handler_list);
1165
1166         list_for_each_entry(dev, &input_dev_list, node)
1167                 input_attach_handler(dev, handler);
1168
1169         input_wakeup_procfs_readers();
1170         return 0;
1171 }
1172 EXPORT_SYMBOL(input_register_handler);
1173
1174 void input_unregister_handler(struct input_handler *handler)
1175 {
1176         struct input_handle *handle, *next;
1177
1178         list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1179                 handler->disconnect(handle);
1180         WARN_ON(!list_empty(&handler->h_list));
1181
1182         list_del_init(&handler->node);
1183
1184         if (handler->fops != NULL)
1185                 input_table[handler->minor >> 5] = NULL;
1186
1187         input_wakeup_procfs_readers();
1188 }
1189 EXPORT_SYMBOL(input_unregister_handler);
1190
1191 int input_register_handle(struct input_handle *handle)
1192 {
1193         struct input_handler *handler = handle->handler;
1194
1195         list_add_tail(&handle->d_node, &handle->dev->h_list);
1196         list_add_tail(&handle->h_node, &handler->h_list);
1197
1198         if (handler->start)
1199                 handler->start(handle);
1200
1201         return 0;
1202 }
1203 EXPORT_SYMBOL(input_register_handle);
1204
1205 void input_unregister_handle(struct input_handle *handle)
1206 {
1207         list_del_init(&handle->h_node);
1208         list_del_init(&handle->d_node);
1209 }
1210 EXPORT_SYMBOL(input_unregister_handle);
1211
1212 static int input_open_file(struct inode *inode, struct file *file)
1213 {
1214         struct input_handler *handler = input_table[iminor(inode) >> 5];
1215         const struct file_operations *old_fops, *new_fops = NULL;
1216         int err;
1217
1218         /* No load-on-demand here? */
1219         if (!handler || !(new_fops = fops_get(handler->fops)))
1220                 return -ENODEV;
1221
1222         /*
1223          * That's _really_ odd. Usually NULL ->open means "nothing special",
1224          * not "no device". Oh, well...
1225          */
1226         if (!new_fops->open) {
1227                 fops_put(new_fops);
1228                 return -ENODEV;
1229         }
1230         old_fops = file->f_op;
1231         file->f_op = new_fops;
1232
1233         err = new_fops->open(inode, file);
1234
1235         if (err) {
1236                 fops_put(file->f_op);
1237                 file->f_op = fops_get(old_fops);
1238         }
1239         fops_put(old_fops);
1240         return err;
1241 }
1242
1243 static const struct file_operations input_fops = {
1244         .owner = THIS_MODULE,
1245         .open = input_open_file,
1246 };
1247
1248 static int __init input_init(void)
1249 {
1250         int err;
1251
1252         err = class_register(&input_class);
1253         if (err) {
1254                 printk(KERN_ERR "input: unable to register input_dev class\n");
1255                 return err;
1256         }
1257
1258         err = input_proc_init();
1259         if (err)
1260                 goto fail1;
1261
1262         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1263         if (err) {
1264                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1265                 goto fail2;
1266         }
1267
1268         return 0;
1269
1270  fail2: input_proc_exit();
1271  fail1: class_unregister(&input_class);
1272         return err;
1273 }
1274
1275 static void __exit input_exit(void)
1276 {
1277         input_proc_exit();
1278         unregister_chrdev(INPUT_MAJOR, "input");
1279         class_unregister(&input_class);
1280 }
1281
1282 subsys_initcall(input_init);
1283 module_exit(input_exit);