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 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
  14
  15 #include <linux/init.h>
  16 #include <linux/types.h>
  17 #include <linux/idr.h>
  18 #include <linux/input/mt.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21 #include <linux/random.h>
  22 #include <linux/major.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/sched.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/poll.h>
  27 #include <linux/device.h>
  28 #include <linux/mutex.h>
  29 #include <linux/rcupdate.h>
  30 #include "input-compat.h"
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  33 MODULE_DESCRIPTION("Input core");
  34 MODULE_LICENSE("GPL");
  35
  36 #define INPUT_MAX_CHAR_DEVICES          1024
  37 #define INPUT_FIRST_DYNAMIC_DEV         256
  38 static DEFINE_IDA(input_ida);
  39
  40 static LIST_HEAD(input_dev_list);
  41 static LIST_HEAD(input_handler_list);
  42
  43 /*
  44  * input_mutex protects access to both input_dev_list and input_handler_list.
  45  * This also causes input_[un]register_device and input_[un]register_handler
  46  * be mutually exclusive which simplifies locking in drivers implementing
  47  * input handlers.
  48  */
  49 static DEFINE_MUTEX(input_mutex);
  50
  51 static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
  52
  53 static inline int is_event_supported(unsigned int code,
  54                                      unsigned long *bm, unsigned int max)
  55 {
  56         return code <= max && test_bit(code, bm);
  57 }
  58
  59 static int input_defuzz_abs_event(int value, int old_val, int fuzz)
  60 {
  61         if (fuzz) {
  62                 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
  63                         return old_val;
  64
  65                 if (value > old_val - fuzz && value < old_val + fuzz)
  66                         return (old_val * 3 + value) / 4;
  67
  68                 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
  69                         return (old_val + value) / 2;
  70         }
  71
  72         return value;
  73 }
  74
  75 static void input_start_autorepeat(struct input_dev *dev, int code)
  76 {
  77         if (test_bit(EV_REP, dev->evbit) &&
  78             dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
  79             dev->timer.data) {
  80                 dev->repeat_key = code;
  81                 mod_timer(&dev->timer,
  82                           jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
  83         }
  84 }
  85
  86 static void input_stop_autorepeat(struct input_dev *dev)
  87 {
  88         del_timer(&dev->timer);
  89 }
  90
  91 /*
  92  * Pass event first through all filters and then, if event has not been
  93  * filtered out, through all open handles. This function is called with
  94  * dev->event_lock held and interrupts disabled.
  95  */
  96 static unsigned int input_to_handler(struct input_handle *handle,
  97                         struct input_value *vals, unsigned int count)
  98 {
  99         struct input_handler *handler = handle->handler;
 100         struct input_value *end = vals;
 101         struct input_value *v;
 102
 103         for (v = vals; v != vals + count; v++) {
 104                 if (handler->filter &&
 105                     handler->filter(handle, v->type, v->code, v->value))
 106                         continue;
 107                 if (end != v)
 108                         *end = *v;
 109                 end++;
 110         }
 111
 112         count = end - vals;
 113         if (!count)
 114                 return 0;
 115
 116         if (handler->events)
 117                 handler->events(handle, vals, count);
 118         else if (handler->event)
 119                 for (v = vals; v != end; v++)
 120                         handler->event(handle, v->type, v->code, v->value);
 121
 122         return count;
 123 }
 124
 125 /*
 126  * Pass values first through all filters and then, if event has not been
 127  * filtered out, through all open handles. This function is called with
 128  * dev->event_lock held and interrupts disabled.
 129  */
 130 static void input_pass_values(struct input_dev *dev,
 131                               struct input_value *vals, unsigned int count)
 132 {
 133         struct input_handle *handle;
 134         struct input_value *v;
 135
 136         if (!count)
 137                 return;
 138
 139         rcu_read_lock();
 140
 141         handle = rcu_dereference(dev->grab);
 142         if (handle) {
 143                 count = input_to_handler(handle, vals, count);
 144         } else {
 145                 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
 146                         if (handle->open)
 147                                 count = input_to_handler(handle, vals, count);
 148         }
 149
 150         rcu_read_unlock();
 151
 152         add_input_randomness(vals->type, vals->code, vals->value);
 153
 154         /* trigger auto repeat for key events */
 155         for (v = vals; v != vals + count; v++) {
 156                 if (v->type == EV_KEY && v->value != 2) {
 157                         if (v->value)
 158                                 input_start_autorepeat(dev, v->code);
 159                         else
 160                                 input_stop_autorepeat(dev);
 161                 }
 162         }
 163 }
 164
 165 static void input_pass_event(struct input_dev *dev,
 166                              unsigned int type, unsigned int code, int value)
 167 {
 168         struct input_value vals[] = { { type, code, value } };
 169
 170         input_pass_values(dev, vals, ARRAY_SIZE(vals));
 171 }
 172
 173 /*
 174  * Generate software autorepeat event. Note that we take
 175  * dev->event_lock here to avoid racing with input_event
 176  * which may cause keys get "stuck".
 177  */
 178 static void input_repeat_key(unsigned long data)
 179 {
 180         struct input_dev *dev = (void *) data;
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&dev->event_lock, flags);
 184
 185         if (test_bit(dev->repeat_key, dev->key) &&
 186             is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
 187                 struct input_value vals[] =  {
 188                         { EV_KEY, dev->repeat_key, 2 },
 189                         input_value_sync
 190                 };
 191
 192                 input_pass_values(dev, vals, ARRAY_SIZE(vals));
 193
 194                 if (dev->rep[REP_PERIOD])
 195                         mod_timer(&dev->timer, jiffies +
 196                                         msecs_to_jiffies(dev->rep[REP_PERIOD]));
 197         }
 198
 199         spin_unlock_irqrestore(&dev->event_lock, flags);
 200 }
 201
 202 #define INPUT_IGNORE_EVENT      0
 203 #define INPUT_PASS_TO_HANDLERS  1
 204 #define INPUT_PASS_TO_DEVICE    2
 205 #define INPUT_SLOT              4
 206 #define INPUT_FLUSH             8
 207 #define INPUT_PASS_TO_ALL       (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
 208
 209 static int input_handle_abs_event(struct input_dev *dev,
 210                                   unsigned int code, int *pval)
 211 {
 212         struct input_mt *mt = dev->mt;
 213         bool is_mt_event;
 214         int *pold;
 215
 216         if (code == ABS_MT_SLOT) {
 217                 /*
 218                  * "Stage" the event; we'll flush it later, when we
 219                  * get actual touch data.
 220                  */
 221                 if (mt && *pval >= 0 && *pval < mt->num_slots)
 222                         mt->slot = *pval;
 223
 224                 return INPUT_IGNORE_EVENT;
 225         }
 226
 227         is_mt_event = input_is_mt_value(code);
 228
 229         if (!is_mt_event) {
 230                 pold = &dev->absinfo[code].value;
 231         } else if (mt) {
 232                 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
 233         } else {
 234                 /*
 235                  * Bypass filtering for multi-touch events when
 236                  * not employing slots.
 237                  */
 238                 pold = NULL;
 239         }
 240
 241         if (pold) {
 242                 *pval = input_defuzz_abs_event(*pval, *pold,
 243                                                 dev->absinfo[code].fuzz);
 244                 if (*pold == *pval)
 245                         return INPUT_IGNORE_EVENT;
 246
 247                 *pold = *pval;
 248         }
 249
 250         /* Flush pending "slot" event */
 251         if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
 252                 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
 253                 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
 254         }
 255
 256         return INPUT_PASS_TO_HANDLERS;
 257 }
 258
 259 static int input_get_disposition(struct input_dev *dev,
 260                           unsigned int type, unsigned int code, int value)
 261 {
 262         int disposition = INPUT_IGNORE_EVENT;
 263
 264         switch (type) {
 265
 266         case EV_SYN:
 267                 switch (code) {
 268                 case SYN_CONFIG:
 269                         disposition = INPUT_PASS_TO_ALL;
 270                         break;
 271
 272                 case SYN_REPORT:
 273                         disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
 274                         break;
 275                 case SYN_MT_REPORT:
 276                         disposition = INPUT_PASS_TO_HANDLERS;
 277                         break;
 278                 }
 279                 break;
 280
 281         case EV_KEY:
 282                 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
 283
 284                         /* auto-repeat bypasses state updates */
 285                         if (value == 2) {
 286                                 disposition = INPUT_PASS_TO_HANDLERS;
 287                                 break;
 288                         }
 289
 290                         if (!!test_bit(code, dev->key) != !!value) {
 291
 292                                 __change_bit(code, dev->key);
 293                                 disposition = INPUT_PASS_TO_HANDLERS;
 294                         }
 295                 }
 296                 break;
 297
 298         case EV_SW:
 299                 if (is_event_supported(code, dev->swbit, SW_MAX) &&
 300                     !!test_bit(code, dev->sw) != !!value) {
 301
 302                         __change_bit(code, dev->sw);
 303                         disposition = INPUT_PASS_TO_HANDLERS;
 304                 }
 305                 break;
 306
 307         case EV_ABS:
 308                 if (is_event_supported(code, dev->absbit, ABS_MAX))
 309                         disposition = input_handle_abs_event(dev, code, &value);
 310
 311                 break;
 312
 313         case EV_REL:
 314                 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
 315                         disposition = INPUT_PASS_TO_HANDLERS;
 316
 317                 break;
 318
 319         case EV_MSC:
 320                 if (is_event_supported(code, dev->mscbit, MSC_MAX))
 321                         disposition = INPUT_PASS_TO_ALL;
 322
 323                 break;
 324
 325         case EV_LED:
 326                 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
 327                     !!test_bit(code, dev->led) != !!value) {
 328
 329                         __change_bit(code, dev->led);
 330                         disposition = INPUT_PASS_TO_ALL;
 331                 }
 332                 break;
 333
 334         case EV_SND:
 335                 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
 336
 337                         if (!!test_bit(code, dev->snd) != !!value)
 338                                 __change_bit(code, dev->snd);
 339                         disposition = INPUT_PASS_TO_ALL;
 340                 }
 341                 break;
 342
 343         case EV_REP:
 344                 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
 345                         dev->rep[code] = value;
 346                         disposition = INPUT_PASS_TO_ALL;
 347                 }
 348                 break;
 349
 350         case EV_FF:
 351                 if (value >= 0)
 352                         disposition = INPUT_PASS_TO_ALL;
 353                 break;
 354
 355         case EV_PWR:
 356                 disposition = INPUT_PASS_TO_ALL;
 357                 break;
 358         }
 359
 360         return disposition;
 361 }
 362
 363 static void input_handle_event(struct input_dev *dev,
 364                                unsigned int type, unsigned int code, int value)
 365 {
 366         int disposition;
 367
 368         disposition = input_get_disposition(dev, type, code, value);
 369
 370         if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
 371                 dev->event(dev, type, code, value);
 372
 373         if (!dev->vals)
 374                 return;
 375
 376         if (disposition & INPUT_PASS_TO_HANDLERS) {
 377                 struct input_value *v;
 378
 379                 if (disposition & INPUT_SLOT) {
 380                         v = &dev->vals[dev->num_vals++];
 381                         v->type = EV_ABS;
 382                         v->code = ABS_MT_SLOT;
 383                         v->value = dev->mt->slot;
 384                 }
 385
 386                 v = &dev->vals[dev->num_vals++];
 387                 v->type = type;
 388                 v->code = code;
 389                 v->value = value;
 390         }
 391
 392         if (disposition & INPUT_FLUSH) {
 393                 if (dev->num_vals >= 2)
 394                         input_pass_values(dev, dev->vals, dev->num_vals);
 395                 dev->num_vals = 0;
 396         } else if (dev->num_vals >= dev->max_vals - 2) {
 397                 dev->vals[dev->num_vals++] = input_value_sync;
 398                 input_pass_values(dev, dev->vals, dev->num_vals);
 399                 dev->num_vals = 0;
 400         }
 401
 402 }
 403
 404 /**
 405  * input_event() - report new input event
 406  * @dev: device that generated the event
 407  * @type: type of the event
 408  * @code: event code
 409  * @value: value of the event
 410  *
 411  * This function should be used by drivers implementing various input
 412  * devices to report input events. See also input_inject_event().
 413  *
 414  * NOTE: input_event() may be safely used right after input device was
 415  * allocated with input_allocate_device(), even before it is registered
 416  * with input_register_device(), but the event will not reach any of the
 417  * input handlers. Such early invocation of input_event() may be used
 418  * to 'seed' initial state of a switch or initial position of absolute
 419  * axis, etc.
 420  */
 421 void input_event(struct input_dev *dev,
 422                  unsigned int type, unsigned int code, int value)
 423 {
 424         unsigned long flags;
 425
 426         if (is_event_supported(type, dev->evbit, EV_MAX)) {
 427
 428                 spin_lock_irqsave(&dev->event_lock, flags);
 429                 input_handle_event(dev, type, code, value);
 430                 spin_unlock_irqrestore(&dev->event_lock, flags);
 431         }
 432 }
 433 EXPORT_SYMBOL(input_event);
 434
 435 /**
 436  * input_inject_event() - send input event from input handler
 437  * @handle: input handle to send event through
 438  * @type: type of the event
 439  * @code: event code
 440  * @value: value of the event
 441  *
 442  * Similar to input_event() but will ignore event if device is
 443  * "grabbed" and handle injecting event is not the one that owns
 444  * the device.
 445  */
 446 void input_inject_event(struct input_handle *handle,
 447                         unsigned int type, unsigned int code, int value)
 448 {
 449         struct input_dev *dev = handle->dev;
 450         struct input_handle *grab;
 451         unsigned long flags;
 452
 453         if (is_event_supported(type, dev->evbit, EV_MAX)) {
 454                 spin_lock_irqsave(&dev->event_lock, flags);
 455
 456                 rcu_read_lock();
 457                 grab = rcu_dereference(dev->grab);
 458                 if (!grab || grab == handle)
 459                         input_handle_event(dev, type, code, value);
 460                 rcu_read_unlock();
 461
 462                 spin_unlock_irqrestore(&dev->event_lock, flags);
 463         }
 464 }
 465 EXPORT_SYMBOL(input_inject_event);
 466
 467 /**
 468  * input_alloc_absinfo - allocates array of input_absinfo structs
 469  * @dev: the input device emitting absolute events
 470  *
 471  * If the absinfo struct the caller asked for is already allocated, this
 472  * functions will not do anything.
 473  */
 474 void input_alloc_absinfo(struct input_dev *dev)
 475 {
 476         if (!dev->absinfo)
 477                 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
 478                                         GFP_KERNEL);
 479
 480         WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
 481 }
 482 EXPORT_SYMBOL(input_alloc_absinfo);
 483
 484 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
 485                           int min, int max, int fuzz, int flat)
 486 {
 487         struct input_absinfo *absinfo;
 488
 489         input_alloc_absinfo(dev);
 490         if (!dev->absinfo)
 491                 return;
 492
 493         absinfo = &dev->absinfo[axis];
 494         absinfo->minimum = min;
 495         absinfo->maximum = max;
 496         absinfo->fuzz = fuzz;
 497         absinfo->flat = flat;
 498
 499         dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
 500 }
 501 EXPORT_SYMBOL(input_set_abs_params);
 502
 503
 504 /**
 505  * input_grab_device - grabs device for exclusive use
 506  * @handle: input handle that wants to own the device
 507  *
 508  * When a device is grabbed by an input handle all events generated by
 509  * the device are delivered only to this handle. Also events injected
 510  * by other input handles are ignored while device is grabbed.
 511  */
 512 int input_grab_device(struct input_handle *handle)
 513 {
 514         struct input_dev *dev = handle->dev;
 515         int retval;
 516
 517         retval = mutex_lock_interruptible(&dev->mutex);
 518         if (retval)
 519                 return retval;
 520
 521         if (dev->grab) {
 522                 retval = -EBUSY;
 523                 goto out;
 524         }
 525
 526         rcu_assign_pointer(dev->grab, handle);
 527
 528  out:
 529         mutex_unlock(&dev->mutex);
 530         return retval;
 531 }
 532 EXPORT_SYMBOL(input_grab_device);
 533
 534 static void __input_release_device(struct input_handle *handle)
 535 {
 536         struct input_dev *dev = handle->dev;
 537         struct input_handle *grabber;
 538
 539         grabber = rcu_dereference_protected(dev->grab,
 540                                             lockdep_is_held(&dev->mutex));
 541         if (grabber == handle) {
 542                 rcu_assign_pointer(dev->grab, NULL);
 543                 /* Make sure input_pass_event() notices that grab is gone */
 544                 synchronize_rcu();
 545
 546                 list_for_each_entry(handle, &dev->h_list, d_node)
 547                         if (handle->open && handle->handler->start)
 548                                 handle->handler->start(handle);
 549         }
 550 }
 551
 552 /**
 553  * input_release_device - release previously grabbed device
 554  * @handle: input handle that owns the device
 555  *
 556  * Releases previously grabbed device so that other input handles can
 557  * start receiving input events. Upon release all handlers attached
 558  * to the device have their start() method called so they have a change
 559  * to synchronize device state with the rest of the system.
 560  */
 561 void input_release_device(struct input_handle *handle)
 562 {
 563         struct input_dev *dev = handle->dev;
 564
 565         mutex_lock(&dev->mutex);
 566         __input_release_device(handle);
 567         mutex_unlock(&dev->mutex);
 568 }
 569 EXPORT_SYMBOL(input_release_device);
 570
 571 /**
 572  * input_open_device - open input device
 573  * @handle: handle through which device is being accessed
 574  *
 575  * This function should be called by input handlers when they
 576  * want to start receive events from given input device.
 577  */
 578 int input_open_device(struct input_handle *handle)
 579 {
 580         struct input_dev *dev = handle->dev;
 581         int retval;
 582
 583         retval = mutex_lock_interruptible(&dev->mutex);
 584         if (retval)
 585                 return retval;
 586
 587         if (dev->going_away) {
 588                 retval = -ENODEV;
 589                 goto out;
 590         }
 591
 592         handle->open++;
 593
 594         if (!dev->users++ && dev->open)
 595                 retval = dev->open(dev);
 596
 597         if (retval) {
 598                 dev->users--;
 599                 if (!--handle->open) {
 600                         /*
 601                          * Make sure we are not delivering any more events
 602                          * through this handle
 603                          */
 604                         synchronize_rcu();
 605                 }
 606         }
 607
 608  out:
 609         mutex_unlock(&dev->mutex);
 610         return retval;
 611 }
 612 EXPORT_SYMBOL(input_open_device);
 613
 614 int input_flush_device(struct input_handle *handle, struct file *file)
 615 {
 616         struct input_dev *dev = handle->dev;
 617         int retval;
 618
 619         retval = mutex_lock_interruptible(&dev->mutex);
 620         if (retval)
 621                 return retval;
 622
 623         if (dev->flush)
 624                 retval = dev->flush(dev, file);
 625
 626         mutex_unlock(&dev->mutex);
 627         return retval;
 628 }
 629 EXPORT_SYMBOL(input_flush_device);
 630
 631 /**
 632  * input_close_device - close input device
 633  * @handle: handle through which device is being accessed
 634  *
 635  * This function should be called by input handlers when they
 636  * want to stop receive events from given input device.
 637  */
 638 void input_close_device(struct input_handle *handle)
 639 {
 640         struct input_dev *dev = handle->dev;
 641
 642         mutex_lock(&dev->mutex);
 643
 644         __input_release_device(handle);
 645
 646         if (!--dev->users && dev->close)
 647                 dev->close(dev);
 648
 649         if (!--handle->open) {
 650                 /*
 651                  * synchronize_rcu() makes sure that input_pass_event()
 652                  * completed and that no more input events are delivered
 653                  * through this handle
 654                  */
 655                 synchronize_rcu();
 656         }
 657
 658         mutex_unlock(&dev->mutex);
 659 }
 660 EXPORT_SYMBOL(input_close_device);
 661
 662 /*
 663  * Simulate keyup events for all keys that are marked as pressed.
 664  * The function must be called with dev->event_lock held.
 665  */
 666 static void input_dev_release_keys(struct input_dev *dev)
 667 {
 668         int code;
 669
 670         if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
 671                 for (code = 0; code <= KEY_MAX; code++) {
 672                         if (is_event_supported(code, dev->keybit, KEY_MAX) &&
 673                             __test_and_clear_bit(code, dev->key)) {
 674                                 input_pass_event(dev, EV_KEY, code, 0);
 675                         }
 676                 }
 677                 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
 678         }
 679 }
 680
 681 /*
 682  * Prepare device for unregistering
 683  */
 684 static void input_disconnect_device(struct input_dev *dev)
 685 {
 686         struct input_handle *handle;
 687
 688         /*
 689          * Mark device as going away. Note that we take dev->mutex here
 690          * not to protect access to dev->going_away but rather to ensure
 691          * that there are no threads in the middle of input_open_device()
 692          */
 693         mutex_lock(&dev->mutex);
 694         dev->going_away = true;
 695         mutex_unlock(&dev->mutex);
 696
 697         spin_lock_irq(&dev->event_lock);
 698
 699         /*
 700          * Simulate keyup events for all pressed keys so that handlers
 701          * are not left with "stuck" keys. The driver may continue
 702          * generate events even after we done here but they will not
 703          * reach any handlers.
 704          */
 705         input_dev_release_keys(dev);
 706
 707         list_for_each_entry(handle, &dev->h_list, d_node)
 708                 handle->open = 0;
 709
 710         spin_unlock_irq(&dev->event_lock);
 711 }
 712
 713 /**
 714  * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry
 715  * @ke: keymap entry containing scancode to be converted.
 716  * @scancode: pointer to the location where converted scancode should
 717  *      be stored.
 718  *
 719  * This function is used to convert scancode stored in &struct keymap_entry
 720  * into scalar form understood by legacy keymap handling methods. These
 721  * methods expect scancodes to be represented as 'unsigned int'.
 722  */
 723 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
 724                              unsigned int *scancode)
 725 {
 726         switch (ke->len) {
 727         case 1:
 728                 *scancode = *((u8 *)ke->scancode);
 729                 break;
 730
 731         case 2:
 732                 *scancode = *((u16 *)ke->scancode);
 733                 break;
 734
 735         case 4:
 736                 *scancode = *((u32 *)ke->scancode);
 737                 break;
 738
 739         default:
 740                 return -EINVAL;
 741         }
 742
 743         return 0;
 744 }
 745 EXPORT_SYMBOL(input_scancode_to_scalar);
 746
 747 /*
 748  * Those routines handle the default case where no [gs]etkeycode() is
 749  * defined. In this case, an array indexed by the scancode is used.
 750  */
 751
 752 static unsigned int input_fetch_keycode(struct input_dev *dev,
 753                                         unsigned int index)
 754 {
 755         switch (dev->keycodesize) {
 756         case 1:
 757                 return ((u8 *)dev->keycode)[index];
 758
 759         case 2:
 760                 return ((u16 *)dev->keycode)[index];
 761
 762         default:
 763                 return ((u32 *)dev->keycode)[index];
 764         }
 765 }
 766
 767 static int input_default_getkeycode(struct input_dev *dev,
 768                                     struct input_keymap_entry *ke)
 769 {
 770         unsigned int index;
 771         int error;
 772
 773         if (!dev->keycodesize)
 774                 return -EINVAL;
 775
 776         if (ke->flags & INPUT_KEYMAP_BY_INDEX)
 777                 index = ke->index;
 778         else {
 779                 error = input_scancode_to_scalar(ke, &index);
 780                 if (error)
 781                         return error;
 782         }
 783
 784         if (index >= dev->keycodemax)
 785                 return -EINVAL;
 786
 787         ke->keycode = input_fetch_keycode(dev, index);
 788         ke->index = index;
 789         ke->len = sizeof(index);
 790         memcpy(ke->scancode, &index, sizeof(index));
 791
 792         return 0;
 793 }
 794
 795 static int input_default_setkeycode(struct input_dev *dev,
 796                                     const struct input_keymap_entry *ke,
 797                                     unsigned int *old_keycode)
 798 {
 799         unsigned int index;
 800         int error;
 801         int i;
 802
 803         if (!dev->keycodesize)
 804                 return -EINVAL;
 805
 806         if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
 807                 index = ke->index;
 808         } else {
 809                 error = input_scancode_to_scalar(ke, &index);
 810                 if (error)
 811                         return error;
 812         }
 813
 814         if (index >= dev->keycodemax)
 815                 return -EINVAL;
 816
 817         if (dev->keycodesize < sizeof(ke->keycode) &&
 818                         (ke->keycode >> (dev->keycodesize * 8)))
 819                 return -EINVAL;
 820
 821         switch (dev->keycodesize) {
 822                 case 1: {
 823                         u8 *k = (u8 *)dev->keycode;
 824                         *old_keycode = k[index];
 825                         k[index] = ke->keycode;
 826                         break;
 827                 }
 828                 case 2: {
 829                         u16 *k = (u16 *)dev->keycode;
 830                         *old_keycode = k[index];
 831                         k[index] = ke->keycode;
 832                         break;
 833                 }
 834                 default: {
 835                         u32 *k = (u32 *)dev->keycode;
 836                         *old_keycode = k[index];
 837                         k[index] = ke->keycode;
 838                         break;
 839                 }
 840         }
 841
 842         __clear_bit(*old_keycode, dev->keybit);
 843         __set_bit(ke->keycode, dev->keybit);
 844
 845         for (i = 0; i < dev->keycodemax; i++) {
 846                 if (input_fetch_keycode(dev, i) == *old_keycode) {
 847                         __set_bit(*old_keycode, dev->keybit);
 848                         break; /* Setting the bit twice is useless, so break */
 849                 }
 850         }
 851
 852         return 0;
 853 }
 854
 855 /**
 856  * input_get_keycode - retrieve keycode currently mapped to a given scancode
 857  * @dev: input device which keymap is being queried
 858  * @ke: keymap entry
 859  *
 860  * This function should be called by anyone interested in retrieving current
 861  * keymap. Presently evdev handlers use it.
 862  */
 863 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
 864 {
 865         unsigned long flags;
 866         int retval;
 867
 868         spin_lock_irqsave(&dev->event_lock, flags);
 869         retval = dev->getkeycode(dev, ke);
 870         spin_unlock_irqrestore(&dev->event_lock, flags);
 871
 872         return retval;
 873 }
 874 EXPORT_SYMBOL(input_get_keycode);
 875
 876 /**
 877  * input_set_keycode - attribute a keycode to a given scancode
 878  * @dev: input device which keymap is being updated
 879  * @ke: new keymap entry
 880  *
 881  * This function should be called by anyone needing to update current
 882  * keymap. Presently keyboard and evdev handlers use it.
 883  */
 884 int input_set_keycode(struct input_dev *dev,
 885                       const struct input_keymap_entry *ke)
 886 {
 887         unsigned long flags;
 888         unsigned int old_keycode;
 889         int retval;
 890
 891         if (ke->keycode > KEY_MAX)
 892                 return -EINVAL;
 893
 894         spin_lock_irqsave(&dev->event_lock, flags);
 895
 896         retval = dev->setkeycode(dev, ke, &old_keycode);
 897         if (retval)
 898                 goto out;
 899
 900         /* Make sure KEY_RESERVED did not get enabled. */
 901         __clear_bit(KEY_RESERVED, dev->keybit);
 902
 903         /*
 904          * Simulate keyup event if keycode is not present
 905          * in the keymap anymore
 906          */
 907         if (test_bit(EV_KEY, dev->evbit) &&
 908             !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
 909             __test_and_clear_bit(old_keycode, dev->key)) {
 910                 struct input_value vals[] =  {
 911                         { EV_KEY, old_keycode, 0 },
 912                         input_value_sync
 913                 };
 914
 915                 input_pass_values(dev, vals, ARRAY_SIZE(vals));
 916         }
 917
 918  out:
 919         spin_unlock_irqrestore(&dev->event_lock, flags);
 920
 921         return retval;
 922 }
 923 EXPORT_SYMBOL(input_set_keycode);
 924
 925 static const struct input_device_id *input_match_device(struct input_handler *handler,
 926                                                         struct input_dev *dev)
 927 {
 928         const struct input_device_id *id;
 929
 930         for (id = handler->id_table; id->flags || id->driver_info; id++) {
 931
 932                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 933                         if (id->bustype != dev->id.bustype)
 934                                 continue;
 935
 936                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 937                         if (id->vendor != dev->id.vendor)
 938                                 continue;
 939
 940                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 941                         if (id->product != dev->id.product)
 942                                 continue;
 943
 944                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 945                         if (id->version != dev->id.version)
 946                                 continue;
 947
 948                 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
 949                         continue;
 950
 951                 if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
 952                         continue;
 953
 954                 if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
 955                         continue;
 956
 957                 if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
 958                         continue;
 959
 960                 if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
 961                         continue;
 962
 963                 if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
 964                         continue;
 965
 966                 if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
 967                         continue;
 968
 969                 if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
 970                         continue;
 971
 972                 if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
 973                         continue;
 974
 975                 if (!handler->match || handler->match(handler, dev))
 976                         return id;
 977         }
 978
 979         return NULL;
 980 }
 981
 982 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
 983 {
 984         const struct input_device_id *id;
 985         int error;
 986
 987         id = input_match_device(handler, dev);
 988         if (!id)
 989                 return -ENODEV;
 990
 991         error = handler->connect(handler, dev, id);
 992         if (error && error != -ENODEV)
 993                 pr_err("failed to attach handler %s to device %s, error: %d\n",
 994                        handler->name, kobject_name(&dev->dev.kobj), error);
 995
 996         return error;
 997 }
 998
 999 #ifdef CONFIG_COMPAT
1000
1001 static int input_bits_to_string(char *buf, int buf_size,
1002                                 unsigned long bits, bool skip_empty)
1003 {
1004         int len = 0;
1005
1006         if (INPUT_COMPAT_TEST) {
1007                 u32 dword = bits >> 32;
1008                 if (dword || !skip_empty)
1009                         len += snprintf(buf, buf_size, "%x ", dword);
1010
1011                 dword = bits & 0xffffffffUL;
1012                 if (dword || !skip_empty || len)
1013                         len += snprintf(buf + len, max(buf_size - len, 0),
1014                                         "%x", dword);
1015         } else {
1016                 if (bits || !skip_empty)
1017                         len += snprintf(buf, buf_size, "%lx", bits);
1018         }
1019
1020         return len;
1021 }
1022
1023 #else /* !CONFIG_COMPAT */
1024
1025 static int input_bits_to_string(char *buf, int buf_size,
1026                                 unsigned long bits, bool skip_empty)
1027 {
1028         return bits || !skip_empty ?
1029                 snprintf(buf, buf_size, "%lx", bits) : 0;
1030 }
1031
1032 #endif
1033
1034 #ifdef CONFIG_PROC_FS
1035
1036 static struct proc_dir_entry *proc_bus_input_dir;
1037 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1038 static int input_devices_state;
1039
1040 static inline void input_wakeup_procfs_readers(void)
1041 {
1042         input_devices_state++;
1043         wake_up(&input_devices_poll_wait);
1044 }
1045
1046 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
1047 {
1048         poll_wait(file, &input_devices_poll_wait, wait);
1049         if (file->f_version != input_devices_state) {
1050                 file->f_version = input_devices_state;
1051                 return POLLIN | POLLRDNORM;
1052         }
1053
1054         return 0;
1055 }
1056
1057 union input_seq_state {
1058         struct {
1059                 unsigned short pos;
1060                 bool mutex_acquired;
1061         };
1062         void *p;
1063 };
1064
1065 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1066 {
1067         union input_seq_state *state = (union input_seq_state *)&seq->private;
1068         int error;
1069
1070         /* We need to fit into seq->private pointer */
1071         BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1072
1073         error = mutex_lock_interruptible(&input_mutex);
1074         if (error) {
1075                 state->mutex_acquired = false;
1076                 return ERR_PTR(error);
1077         }
1078
1079         state->mutex_acquired = true;
1080
1081         return seq_list_start(&input_dev_list, *pos);
1082 }
1083
1084 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1085 {
1086         return seq_list_next(v, &input_dev_list, pos);
1087 }
1088
1089 static void input_seq_stop(struct seq_file *seq, void *v)
1090 {
1091         union input_seq_state *state = (union input_seq_state *)&seq->private;
1092
1093         if (state->mutex_acquired)
1094                 mutex_unlock(&input_mutex);
1095 }
1096
1097 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1098                                    unsigned long *bitmap, int max)
1099 {
1100         int i;
1101         bool skip_empty = true;
1102         char buf[18];
1103
1104         seq_printf(seq, "B: %s=", name);
1105
1106         for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1107                 if (input_bits_to_string(buf, sizeof(buf),
1108                                          bitmap[i], skip_empty)) {
1109                         skip_empty = false;
1110                         seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1111                 }
1112         }
1113
1114         /*
1115          * If no output was produced print a single 0.
1116          */
1117         if (skip_empty)
1118                 seq_puts(seq, "0");
1119
1120         seq_putc(seq, '\n');
1121 }
1122
1123 static int input_devices_seq_show(struct seq_file *seq, void *v)
1124 {
1125         struct input_dev *dev = container_of(v, struct input_dev, node);
1126         const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1127         struct input_handle *handle;
1128
1129         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1130                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1131
1132         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1133         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1134         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1135         seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1136         seq_printf(seq, "H: Handlers=");
1137
1138         list_for_each_entry(handle, &dev->h_list, d_node)
1139                 seq_printf(seq, "%s ", handle->name);
1140         seq_putc(seq, '\n');
1141
1142         input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1143
1144         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1145         if (test_bit(EV_KEY, dev->evbit))
1146                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1147         if (test_bit(EV_REL, dev->evbit))
1148                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1149         if (test_bit(EV_ABS, dev->evbit))
1150                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1151         if (test_bit(EV_MSC, dev->evbit))
1152                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1153         if (test_bit(EV_LED, dev->evbit))
1154                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1155         if (test_bit(EV_SND, dev->evbit))
1156                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1157         if (test_bit(EV_FF, dev->evbit))
1158                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1159         if (test_bit(EV_SW, dev->evbit))
1160                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1161
1162         seq_putc(seq, '\n');
1163
1164         kfree(path);
1165         return 0;
1166 }
1167
1168 static const struct seq_operations input_devices_seq_ops = {
1169         .start  = input_devices_seq_start,
1170         .next   = input_devices_seq_next,
1171         .stop   = input_seq_stop,
1172         .show   = input_devices_seq_show,
1173 };
1174
1175 static int input_proc_devices_open(struct inode *inode, struct file *file)
1176 {
1177         return seq_open(file, &input_devices_seq_ops);
1178 }
1179
1180 static const struct file_operations input_devices_fileops = {
1181         .owner          = THIS_MODULE,
1182         .open           = input_proc_devices_open,
1183         .poll           = input_proc_devices_poll,
1184         .read           = seq_read,
1185         .llseek         = seq_lseek,
1186         .release        = seq_release,
1187 };
1188
1189 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1190 {
1191         union input_seq_state *state = (union input_seq_state *)&seq->private;
1192         int error;
1193
1194         /* We need to fit into seq->private pointer */
1195         BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1196
1197         error = mutex_lock_interruptible(&input_mutex);
1198         if (error) {
1199                 state->mutex_acquired = false;
1200                 return ERR_PTR(error);
1201         }
1202
1203         state->mutex_acquired = true;
1204         state->pos = *pos;
1205
1206         return seq_list_start(&input_handler_list, *pos);
1207 }
1208
1209 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1210 {
1211         union input_seq_state *state = (union input_seq_state *)&seq->private;
1212
1213         state->pos = *pos + 1;
1214         return seq_list_next(v, &input_handler_list, pos);
1215 }
1216
1217 static int input_handlers_seq_show(struct seq_file *seq, void *v)
1218 {
1219         struct input_handler *handler = container_of(v, struct input_handler, node);
1220         union input_seq_state *state = (union input_seq_state *)&seq->private;
1221
1222         seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1223         if (handler->filter)
1224                 seq_puts(seq, " (filter)");
1225         if (handler->legacy_minors)
1226                 seq_printf(seq, " Minor=%d", handler->minor);
1227         seq_putc(seq, '\n');
1228
1229         return 0;
1230 }
1231
1232 static const struct seq_operations input_handlers_seq_ops = {
1233         .start  = input_handlers_seq_start,
1234         .next   = input_handlers_seq_next,
1235         .stop   = input_seq_stop,
1236         .show   = input_handlers_seq_show,
1237 };
1238
1239 static int input_proc_handlers_open(struct inode *inode, struct file *file)
1240 {
1241         return seq_open(file, &input_handlers_seq_ops);
1242 }
1243
1244 static const struct file_operations input_handlers_fileops = {
1245         .owner          = THIS_MODULE,
1246         .open           = input_proc_handlers_open,
1247         .read           = seq_read,
1248         .llseek         = seq_lseek,
1249         .release        = seq_release,
1250 };
1251
1252 static int __init input_proc_init(void)
1253 {
1254         struct proc_dir_entry *entry;
1255
1256         proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1257         if (!proc_bus_input_dir)
1258                 return -ENOMEM;
1259
1260         entry = proc_create("devices", 0, proc_bus_input_dir,
1261                             &input_devices_fileops);
1262         if (!entry)
1263                 goto fail1;
1264
1265         entry = proc_create("handlers", 0, proc_bus_input_dir,
1266                             &input_handlers_fileops);
1267         if (!entry)
1268                 goto fail2;
1269
1270         return 0;
1271
1272  fail2: remove_proc_entry("devices", proc_bus_input_dir);
1273  fail1: remove_proc_entry("bus/input", NULL);
1274         return -ENOMEM;
1275 }
1276
1277 static void input_proc_exit(void)
1278 {
1279         remove_proc_entry("devices", proc_bus_input_dir);
1280         remove_proc_entry("handlers", proc_bus_input_dir);
1281         remove_proc_entry("bus/input", NULL);
1282 }
1283
1284 #else /* !CONFIG_PROC_FS */
1285 static inline void input_wakeup_procfs_readers(void) { }
1286 static inline int input_proc_init(void) { return 0; }
1287 static inline void input_proc_exit(void) { }
1288 #endif
1289
1290 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                \
1291 static ssize_t input_dev_show_##name(struct device *dev,                \
1292                                      struct device_attribute *attr,     \
1293                                      char *buf)                         \
1294 {                                                                       \
1295         struct input_dev *input_dev = to_input_dev(dev);                \
1296                                                                         \
1297         return scnprintf(buf, PAGE_SIZE, "%s\n",                        \
1298                          input_dev->name ? input_dev->name : "");       \
1299 }                                                                       \
1300 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1301
1302 INPUT_DEV_STRING_ATTR_SHOW(name);
1303 INPUT_DEV_STRING_ATTR_SHOW(phys);
1304 INPUT_DEV_STRING_ATTR_SHOW(uniq);
1305
1306 static int input_print_modalias_bits(char *buf, int size,
1307                                      char name, unsigned long *bm,
1308                                      unsigned int min_bit, unsigned int max_bit)
1309 {
1310         int len = 0, i;
1311
1312         len += snprintf(buf, max(size, 0), "%c", name);
1313         for (i = min_bit; i < max_bit; i++)
1314                 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1315                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1316         return len;
1317 }
1318
1319 static int input_print_modalias(char *buf, int size, struct input_dev *id,
1320                                 int add_cr)
1321 {
1322         int len;
1323
1324         len = snprintf(buf, max(size, 0),
1325                        "input:b%04Xv%04Xp%04Xe%04X-",
1326                        id->id.bustype, id->id.vendor,
1327                        id->id.product, id->id.version);
1328
1329         len += input_print_modalias_bits(buf + len, size - len,
1330                                 'e', id->evbit, 0, EV_MAX);
1331         len += input_print_modalias_bits(buf + len, size - len,
1332                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1333         len += input_print_modalias_bits(buf + len, size - len,
1334                                 'r', id->relbit, 0, REL_MAX);
1335         len += input_print_modalias_bits(buf + len, size - len,
1336                                 'a', id->absbit, 0, ABS_MAX);
1337         len += input_print_modalias_bits(buf + len, size - len,
1338                                 'm', id->mscbit, 0, MSC_MAX);
1339         len += input_print_modalias_bits(buf + len, size - len,
1340                                 'l', id->ledbit, 0, LED_MAX);
1341         len += input_print_modalias_bits(buf + len, size - len,
1342                                 's', id->sndbit, 0, SND_MAX);
1343         len += input_print_modalias_bits(buf + len, size - len,
1344                                 'f', id->ffbit, 0, FF_MAX);
1345         len += input_print_modalias_bits(buf + len, size - len,
1346                                 'w', id->swbit, 0, SW_MAX);
1347
1348         if (add_cr)
1349                 len += snprintf(buf + len, max(size - len, 0), "\n");
1350
1351         return len;
1352 }
1353
1354 static ssize_t input_dev_show_modalias(struct device *dev,
1355                                        struct device_attribute *attr,
1356                                        char *buf)
1357 {
1358         struct input_dev *id = to_input_dev(dev);
1359         ssize_t len;
1360
1361         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1362
1363         return min_t(int, len, PAGE_SIZE);
1364 }
1365 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1366
1367 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1368                               int max, int add_cr);
1369
1370 static ssize_t input_dev_show_properties(struct device *dev,
1371                                          struct device_attribute *attr,
1372                                          char *buf)
1373 {
1374         struct input_dev *input_dev = to_input_dev(dev);
1375         int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1376                                      INPUT_PROP_MAX, true);
1377         return min_t(int, len, PAGE_SIZE);
1378 }
1379 static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1380
1381 static struct attribute *input_dev_attrs[] = {
1382         &dev_attr_name.attr,
1383         &dev_attr_phys.attr,
1384         &dev_attr_uniq.attr,
1385         &dev_attr_modalias.attr,
1386         &dev_attr_properties.attr,
1387         NULL
1388 };
1389
1390 static struct attribute_group input_dev_attr_group = {
1391         .attrs  = input_dev_attrs,
1392 };
1393
1394 #define INPUT_DEV_ID_ATTR(name)                                         \
1395 static ssize_t input_dev_show_id_##name(struct device *dev,             \
1396                                         struct device_attribute *attr,  \
1397                                         char *buf)                      \
1398 {                                                                       \
1399         struct input_dev *input_dev = to_input_dev(dev);                \
1400         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1401 }                                                                       \
1402 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1403
1404 INPUT_DEV_ID_ATTR(bustype);
1405 INPUT_DEV_ID_ATTR(vendor);
1406 INPUT_DEV_ID_ATTR(product);
1407 INPUT_DEV_ID_ATTR(version);
1408
1409 static struct attribute *input_dev_id_attrs[] = {
1410         &dev_attr_bustype.attr,
1411         &dev_attr_vendor.attr,
1412         &dev_attr_product.attr,
1413         &dev_attr_version.attr,
1414         NULL
1415 };
1416
1417 static struct attribute_group input_dev_id_attr_group = {
1418         .name   = "id",
1419         .attrs  = input_dev_id_attrs,
1420 };
1421
1422 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1423                               int max, int add_cr)
1424 {
1425         int i;
1426         int len = 0;
1427         bool skip_empty = true;
1428
1429         for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1430                 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1431                                             bitmap[i], skip_empty);
1432                 if (len) {
1433                         skip_empty = false;
1434                         if (i > 0)
1435                                 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1436                 }
1437         }
1438
1439         /*
1440          * If no output was produced print a single 0.
1441          */
1442         if (len == 0)
1443                 len = snprintf(buf, buf_size, "%d", 0);
1444
1445         if (add_cr)
1446                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1447
1448         return len;
1449 }
1450
1451 #define INPUT_DEV_CAP_ATTR(ev, bm)                                      \
1452 static ssize_t input_dev_show_cap_##bm(struct device *dev,              \
1453                                        struct device_attribute *attr,   \
1454                                        char *buf)                       \
1455 {                                                                       \
1456         struct input_dev *input_dev = to_input_dev(dev);                \
1457         int len = input_print_bitmap(buf, PAGE_SIZE,                    \
1458                                      input_dev->bm##bit, ev##_MAX,      \
1459                                      true);                             \
1460         return min_t(int, len, PAGE_SIZE);                              \
1461 }                                                                       \
1462 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1463
1464 INPUT_DEV_CAP_ATTR(EV, ev);
1465 INPUT_DEV_CAP_ATTR(KEY, key);
1466 INPUT_DEV_CAP_ATTR(REL, rel);
1467 INPUT_DEV_CAP_ATTR(ABS, abs);
1468 INPUT_DEV_CAP_ATTR(MSC, msc);
1469 INPUT_DEV_CAP_ATTR(LED, led);
1470 INPUT_DEV_CAP_ATTR(SND, snd);
1471 INPUT_DEV_CAP_ATTR(FF, ff);
1472 INPUT_DEV_CAP_ATTR(SW, sw);
1473
1474 static struct attribute *input_dev_caps_attrs[] = {
1475         &dev_attr_ev.attr,
1476         &dev_attr_key.attr,
1477         &dev_attr_rel.attr,
1478         &dev_attr_abs.attr,
1479         &dev_attr_msc.attr,
1480         &dev_attr_led.attr,
1481         &dev_attr_snd.attr,
1482         &dev_attr_ff.attr,
1483         &dev_attr_sw.attr,
1484         NULL
1485 };
1486
1487 static struct attribute_group input_dev_caps_attr_group = {
1488         .name   = "capabilities",
1489         .attrs  = input_dev_caps_attrs,
1490 };
1491
1492 static const struct attribute_group *input_dev_attr_groups[] = {
1493         &input_dev_attr_group,
1494         &input_dev_id_attr_group,
1495         &input_dev_caps_attr_group,
1496         NULL
1497 };
1498
1499 static void input_dev_release(struct device *device)
1500 {
1501         struct input_dev *dev = to_input_dev(device);
1502
1503         input_ff_destroy(dev);
1504         input_mt_destroy_slots(dev);
1505         kfree(dev->absinfo);
1506         kfree(dev->vals);
1507         kfree(dev);
1508
1509         module_put(THIS_MODULE);
1510 }
1511
1512 /*
1513  * Input uevent interface - loading event handlers based on
1514  * device bitfields.
1515  */
1516 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1517                                    const char *name, unsigned long *bitmap, int max)
1518 {
1519         int len;
1520
1521         if (add_uevent_var(env, "%s", name))
1522                 return -ENOMEM;
1523
1524         len = input_print_bitmap(&env->buf[env->buflen - 1],
1525                                  sizeof(env->buf) - env->buflen,
1526                                  bitmap, max, false);
1527         if (len >= (sizeof(env->buf) - env->buflen))
1528                 return -ENOMEM;
1529
1530         env->buflen += len;
1531         return 0;
1532 }
1533
1534 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1535                                          struct input_dev *dev)
1536 {
1537         int len;
1538
1539         if (add_uevent_var(env, "MODALIAS="))
1540                 return -ENOMEM;
1541
1542         len = input_print_modalias(&env->buf[env->buflen - 1],
1543                                    sizeof(env->buf) - env->buflen,
1544                                    dev, 0);
1545         if (len >= (sizeof(env->buf) - env->buflen))
1546                 return -ENOMEM;
1547
1548         env->buflen += len;
1549         return 0;
1550 }
1551
1552 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
1553         do {                                                            \
1554                 int err = add_uevent_var(env, fmt, val);                \
1555                 if (err)                                                \
1556                         return err;                                     \
1557         } while (0)
1558
1559 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
1560         do {                                                            \
1561                 int err = input_add_uevent_bm_var(env, name, bm, max);  \
1562                 if (err)                                                \
1563                         return err;                                     \
1564         } while (0)
1565
1566 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
1567         do {                                                            \
1568                 int err = input_add_uevent_modalias_var(env, dev);      \
1569                 if (err)                                                \
1570                         return err;                                     \
1571         } while (0)
1572
1573 static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1574 {
1575         struct input_dev *dev = to_input_dev(device);
1576
1577         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1578                                 dev->id.bustype, dev->id.vendor,
1579                                 dev->id.product, dev->id.version);
1580         if (dev->name)
1581                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1582         if (dev->phys)
1583                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1584         if (dev->uniq)
1585                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1586
1587         INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1588
1589         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1590         if (test_bit(EV_KEY, dev->evbit))
1591                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1592         if (test_bit(EV_REL, dev->evbit))
1593                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1594         if (test_bit(EV_ABS, dev->evbit))
1595                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1596         if (test_bit(EV_MSC, dev->evbit))
1597                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1598         if (test_bit(EV_LED, dev->evbit))
1599                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1600         if (test_bit(EV_SND, dev->evbit))
1601                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1602         if (test_bit(EV_FF, dev->evbit))
1603                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1604         if (test_bit(EV_SW, dev->evbit))
1605                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1606
1607         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1608
1609         return 0;
1610 }
1611
1612 #define INPUT_DO_TOGGLE(dev, type, bits, on)                            \
1613         do {                                                            \
1614                 int i;                                                  \
1615                 bool active;                                            \
1616                                                                         \
1617                 if (!test_bit(EV_##type, dev->evbit))                   \
1618                         break;                                          \
1619                                                                         \
1620                 for (i = 0; i < type##_MAX; i++) {                      \
1621                         if (!test_bit(i, dev->bits##bit))               \
1622                                 continue;                               \
1623                                                                         \
1624                         active = test_bit(i, dev->bits);                \
1625                         if (!active && !on)                             \
1626                                 continue;                               \
1627                                                                         \
1628                         dev->event(dev, EV_##type, i, on ? active : 0); \
1629                 }                                                       \
1630         } while (0)
1631
1632 static void input_dev_toggle(struct input_dev *dev, bool activate)
1633 {
1634         if (!dev->event)
1635                 return;
1636
1637         INPUT_DO_TOGGLE(dev, LED, led, activate);
1638         INPUT_DO_TOGGLE(dev, SND, snd, activate);
1639
1640         if (activate && test_bit(EV_REP, dev->evbit)) {
1641                 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1642                 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1643         }
1644 }
1645
1646 /**
1647  * input_reset_device() - reset/restore the state of input device
1648  * @dev: input device whose state needs to be reset
1649  *
1650  * This function tries to reset the state of an opened input device and
1651  * bring internal state and state if the hardware in sync with each other.
1652  * We mark all keys as released, restore LED state, repeat rate, etc.
1653  */
1654 void input_reset_device(struct input_dev *dev)
1655 {
1656         mutex_lock(&dev->mutex);
1657
1658         if (dev->users) {
1659                 input_dev_toggle(dev, true);
1660
1661                 /*
1662                  * Keys that have been pressed at suspend time are unlikely
1663                  * to be still pressed when we resume.
1664                  */
1665                 spin_lock_irq(&dev->event_lock);
1666                 input_dev_release_keys(dev);
1667                 spin_unlock_irq(&dev->event_lock);
1668         }
1669
1670         mutex_unlock(&dev->mutex);
1671 }
1672 EXPORT_SYMBOL(input_reset_device);
1673
1674 #ifdef CONFIG_PM
1675 static int input_dev_suspend(struct device *dev)
1676 {
1677         struct input_dev *input_dev = to_input_dev(dev);
1678
1679         mutex_lock(&input_dev->mutex);
1680
1681         if (input_dev->users)
1682                 input_dev_toggle(input_dev, false);
1683
1684         mutex_unlock(&input_dev->mutex);
1685
1686         return 0;
1687 }
1688
1689 static int input_dev_resume(struct device *dev)
1690 {
1691         struct input_dev *input_dev = to_input_dev(dev);
1692
1693         input_reset_device(input_dev);
1694
1695         return 0;
1696 }
1697
1698 static const struct dev_pm_ops input_dev_pm_ops = {
1699         .suspend        = input_dev_suspend,
1700         .resume         = input_dev_resume,
1701         .poweroff       = input_dev_suspend,
1702         .restore        = input_dev_resume,
1703 };
1704 #endif /* CONFIG_PM */
1705
1706 static struct device_type input_dev_type = {
1707         .groups         = input_dev_attr_groups,
1708         .release        = input_dev_release,
1709         .uevent         = input_dev_uevent,
1710 #ifdef CONFIG_PM
1711         .pm             = &input_dev_pm_ops,
1712 #endif
1713 };
1714
1715 static char *input_devnode(struct device *dev, umode_t *mode)
1716 {
1717         return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1718 }
1719
1720 struct class input_class = {
1721         .name           = "input",
1722         .devnode        = input_devnode,
1723 };
1724 EXPORT_SYMBOL_GPL(input_class);
1725
1726 /**
1727  * input_allocate_device - allocate memory for new input device
1728  *
1729  * Returns prepared struct input_dev or %NULL.
1730  *
1731  * NOTE: Use input_free_device() to free devices that have not been
1732  * registered; input_unregister_device() should be used for already
1733  * registered devices.
1734  */
1735 struct input_dev *input_allocate_device(void)
1736 {
1737         struct input_dev *dev;
1738
1739         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1740         if (dev) {
1741                 dev->dev.type = &input_dev_type;
1742                 dev->dev.class = &input_class;
1743                 device_initialize(&dev->dev);
1744                 mutex_init(&dev->mutex);
1745                 spin_lock_init(&dev->event_lock);
1746                 INIT_LIST_HEAD(&dev->h_list);
1747                 INIT_LIST_HEAD(&dev->node);
1748
1749                 __module_get(THIS_MODULE);
1750         }
1751
1752         return dev;
1753 }
1754 EXPORT_SYMBOL(input_allocate_device);
1755
1756 struct input_devres {
1757         struct input_dev *input;
1758 };
1759
1760 static int devm_input_device_match(struct device *dev, void *res, void *data)
1761 {
1762         struct input_devres *devres = res;
1763
1764         return devres->input == data;
1765 }
1766
1767 static void devm_input_device_release(struct device *dev, void *res)
1768 {
1769         struct input_devres *devres = res;
1770         struct input_dev *input = devres->input;
1771
1772         dev_dbg(dev, "%s: dropping reference to %s\n",
1773                 __func__, dev_name(&input->dev));
1774         input_put_device(input);
1775 }
1776
1777 /**
1778  * devm_input_allocate_device - allocate managed input device
1779  * @dev: device owning the input device being created
1780  *
1781  * Returns prepared struct input_dev or %NULL.
1782  *
1783  * Managed input devices do not need to be explicitly unregistered or
1784  * freed as it will be done automatically when owner device unbinds from
1785  * its driver (or binding fails). Once managed input device is allocated,
1786  * it is ready to be set up and registered in the same fashion as regular
1787  * input device. There are no special devm_input_device_[un]register()
1788  * variants, regular ones work with both managed and unmanaged devices,
1789  * should you need them. In most cases however, managed input device need
1790  * not be explicitly unregistered or freed.
1791  *
1792  * NOTE: the owner device is set up as parent of input device and users
1793  * should not override it.
1794  */
1795 struct input_dev *devm_input_allocate_device(struct device *dev)
1796 {
1797         struct input_dev *input;
1798         struct input_devres *devres;
1799
1800         devres = devres_alloc(devm_input_device_release,
1801                               sizeof(struct input_devres), GFP_KERNEL);
1802         if (!devres)
1803                 return NULL;
1804
1805         input = input_allocate_device();
1806         if (!input) {
1807                 devres_free(devres);
1808                 return NULL;
1809         }
1810
1811         input->dev.parent = dev;
1812         input->devres_managed = true;
1813
1814         devres->input = input;
1815         devres_add(dev, devres);
1816
1817         return input;
1818 }
1819 EXPORT_SYMBOL(devm_input_allocate_device);
1820
1821 /**
1822  * input_free_device - free memory occupied by input_dev structure
1823  * @dev: input device to free
1824  *
1825  * This function should only be used if input_register_device()
1826  * was not called yet or if it failed. Once device was registered
1827  * use input_unregister_device() and memory will be freed once last
1828  * reference to the device is dropped.
1829  *
1830  * Device should be allocated by input_allocate_device().
1831  *
1832  * NOTE: If there are references to the input device then memory
1833  * will not be freed until last reference is dropped.
1834  */
1835 void input_free_device(struct input_dev *dev)
1836 {
1837         if (dev) {
1838                 if (dev->devres_managed)
1839                         WARN_ON(devres_destroy(dev->dev.parent,
1840                                                 devm_input_device_release,
1841                                                 devm_input_device_match,
1842                                                 dev));
1843                 input_put_device(dev);
1844         }
1845 }
1846 EXPORT_SYMBOL(input_free_device);
1847
1848 /**
1849  * input_set_capability - mark device as capable of a certain event
1850  * @dev: device that is capable of emitting or accepting event
1851  * @type: type of the event (EV_KEY, EV_REL, etc...)
1852  * @code: event code
1853  *
1854  * In addition to setting up corresponding bit in appropriate capability
1855  * bitmap the function also adjusts dev->evbit.
1856  */
1857 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1858 {
1859         switch (type) {
1860         case EV_KEY:
1861                 __set_bit(code, dev->keybit);
1862                 break;
1863
1864         case EV_REL:
1865                 __set_bit(code, dev->relbit);
1866                 break;
1867
1868         case EV_ABS:
1869                 __set_bit(code, dev->absbit);
1870                 break;
1871
1872         case EV_MSC:
1873                 __set_bit(code, dev->mscbit);
1874                 break;
1875
1876         case EV_SW:
1877                 __set_bit(code, dev->swbit);
1878                 break;
1879
1880         case EV_LED:
1881                 __set_bit(code, dev->ledbit);
1882                 break;
1883
1884         case EV_SND:
1885                 __set_bit(code, dev->sndbit);
1886                 break;
1887
1888         case EV_FF:
1889                 __set_bit(code, dev->ffbit);
1890                 break;
1891
1892         case EV_PWR:
1893                 /* do nothing */
1894                 break;
1895
1896         default:
1897                 pr_err("input_set_capability: unknown type %u (code %u)\n",
1898                        type, code);
1899                 dump_stack();
1900                 return;
1901         }
1902
1903         __set_bit(type, dev->evbit);
1904 }
1905 EXPORT_SYMBOL(input_set_capability);
1906
1907 static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
1908 {
1909         int mt_slots;
1910         int i;
1911         unsigned int events;
1912
1913         if (dev->mt) {
1914                 mt_slots = dev->mt->num_slots;
1915         } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
1916                 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
1917                            dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
1918                 mt_slots = clamp(mt_slots, 2, 32);
1919         } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
1920                 mt_slots = 2;
1921         } else {
1922                 mt_slots = 0;
1923         }
1924
1925         events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */
1926
1927         for (i = 0; i < ABS_CNT; i++) {
1928                 if (test_bit(i, dev->absbit)) {
1929                         if (input_is_mt_axis(i))
1930                                 events += mt_slots;
1931                         else
1932                                 events++;
1933                 }
1934         }
1935
1936         for (i = 0; i < REL_CNT; i++)
1937                 if (test_bit(i, dev->relbit))
1938                         events++;
1939
1940         /* Make room for KEY and MSC events */
1941         events += 7;
1942
1943         return events;
1944 }
1945
1946 #define INPUT_CLEANSE_BITMASK(dev, type, bits)                          \
1947         do {                                                            \
1948                 if (!test_bit(EV_##type, dev->evbit))                   \
1949                         memset(dev->bits##bit, 0,                       \
1950                                 sizeof(dev->bits##bit));                \
1951         } while (0)
1952
1953 static void input_cleanse_bitmasks(struct input_dev *dev)
1954 {
1955         INPUT_CLEANSE_BITMASK(dev, KEY, key);
1956         INPUT_CLEANSE_BITMASK(dev, REL, rel);
1957         INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1958         INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1959         INPUT_CLEANSE_BITMASK(dev, LED, led);
1960         INPUT_CLEANSE_BITMASK(dev, SND, snd);
1961         INPUT_CLEANSE_BITMASK(dev, FF, ff);
1962         INPUT_CLEANSE_BITMASK(dev, SW, sw);
1963 }
1964
1965 static void __input_unregister_device(struct input_dev *dev)
1966 {
1967         struct input_handle *handle, *next;
1968
1969         input_disconnect_device(dev);
1970
1971         mutex_lock(&input_mutex);
1972
1973         list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1974                 handle->handler->disconnect(handle);
1975         WARN_ON(!list_empty(&dev->h_list));
1976
1977         del_timer_sync(&dev->timer);
1978         list_del_init(&dev->node);
1979
1980         input_wakeup_procfs_readers();
1981
1982         mutex_unlock(&input_mutex);
1983
1984         device_del(&dev->dev);
1985 }
1986
1987 static void devm_input_device_unregister(struct device *dev, void *res)
1988 {
1989         struct input_devres *devres = res;
1990         struct input_dev *input = devres->input;
1991
1992         dev_dbg(dev, "%s: unregistering device %s\n",
1993                 __func__, dev_name(&input->dev));
1994         __input_unregister_device(input);
1995 }
1996
1997 /**
1998  * input_register_device - register device with input core
1999  * @dev: device to be registered
2000  *
2001  * This function registers device with input core. The device must be
2002  * allocated with input_allocate_device() and all it's capabilities
2003  * set up before registering.
2004  * If function fails the device must be freed with input_free_device().
2005  * Once device has been successfully registered it can be unregistered
2006  * with input_unregister_device(); input_free_device() should not be
2007  * called in this case.
2008  *
2009  * Note that this function is also used to register managed input devices
2010  * (ones allocated with devm_input_allocate_device()). Such managed input
2011  * devices need not be explicitly unregistered or freed, their tear down
2012  * is controlled by the devres infrastructure. It is also worth noting
2013  * that tear down of managed input devices is internally a 2-step process:
2014  * registered managed input device is first unregistered, but stays in
2015  * memory and can still handle input_event() calls (although events will
2016  * not be delivered anywhere). The freeing of managed input device will
2017  * happen later, when devres stack is unwound to the point where device
2018  * allocation was made.
2019  */
2020 int input_register_device(struct input_dev *dev)
2021 {
2022         static atomic_t input_no = ATOMIC_INIT(0);
2023         struct input_devres *devres = NULL;
2024         struct input_handler *handler;
2025         unsigned int packet_size;
2026         const char *path;
2027         int error;
2028
2029         if (dev->devres_managed) {
2030                 devres = devres_alloc(devm_input_device_unregister,
2031                                       sizeof(struct input_devres), GFP_KERNEL);
2032                 if (!devres)
2033                         return -ENOMEM;
2034
2035                 devres->input = dev;
2036         }
2037
2038         /* Every input device generates EV_SYN/SYN_REPORT events. */
2039         __set_bit(EV_SYN, dev->evbit);
2040
2041         /* KEY_RESERVED is not supposed to be transmitted to userspace. */
2042         __clear_bit(KEY_RESERVED, dev->keybit);
2043
2044         /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
2045         input_cleanse_bitmasks(dev);
2046
2047         packet_size = input_estimate_events_per_packet(dev);
2048         if (dev->hint_events_per_packet < packet_size)
2049                 dev->hint_events_per_packet = packet_size;
2050
2051         dev->max_vals = max(dev->hint_events_per_packet, packet_size) + 2;
2052         dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2053         if (!dev->vals) {
2054                 error = -ENOMEM;
2055                 goto err_devres_free;
2056         }
2057
2058         /*
2059          * If delay and period are pre-set by the driver, then autorepeating
2060          * is handled by the driver itself and we don't do it in input.c.
2061          */
2062         init_timer(&dev->timer);
2063         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
2064                 dev->timer.data = (long) dev;
2065                 dev->timer.function = input_repeat_key;
2066                 dev->rep[REP_DELAY] = 250;
2067                 dev->rep[REP_PERIOD] = 33;
2068         }
2069
2070         if (!dev->getkeycode)
2071                 dev->getkeycode = input_default_getkeycode;
2072
2073         if (!dev->setkeycode)
2074                 dev->setkeycode = input_default_setkeycode;
2075
2076         dev_set_name(&dev->dev, "input%ld",
2077                      (unsigned long) atomic_inc_return(&input_no) - 1);
2078
2079         error = device_add(&dev->dev);
2080         if (error)
2081                 goto err_free_vals;
2082
2083         path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2084         pr_info("%s as %s\n",
2085                 dev->name ? dev->name : "Unspecified device",
2086                 path ? path : "N/A");
2087         kfree(path);
2088
2089         error = mutex_lock_interruptible(&input_mutex);
2090         if (error)
2091                 goto err_device_del;
2092
2093         list_add_tail(&dev->node, &input_dev_list);
2094
2095         list_for_each_entry(handler, &input_handler_list, node)
2096                 input_attach_handler(dev, handler);
2097
2098         input_wakeup_procfs_readers();
2099
2100         mutex_unlock(&input_mutex);
2101
2102         if (dev->devres_managed) {
2103                 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2104                         __func__, dev_name(&dev->dev));
2105                 devres_add(dev->dev.parent, devres);
2106         }
2107         return 0;
2108
2109 err_device_del:
2110         device_del(&dev->dev);
2111 err_free_vals:
2112         kfree(dev->vals);
2113         dev->vals = NULL;
2114 err_devres_free:
2115         devres_free(devres);
2116         return error;
2117 }
2118 EXPORT_SYMBOL(input_register_device);
2119
2120 /**
2121  * input_unregister_device - unregister previously registered device
2122  * @dev: device to be unregistered
2123  *
2124  * This function unregisters an input device. Once device is unregistered
2125  * the caller should not try to access it as it may get freed at any moment.
2126  */
2127 void input_unregister_device(struct input_dev *dev)
2128 {
2129         if (dev->devres_managed) {
2130                 WARN_ON(devres_destroy(dev->dev.parent,
2131                                         devm_input_device_unregister,
2132                                         devm_input_device_match,
2133                                         dev));
2134                 __input_unregister_device(dev);
2135                 /*
2136                  * We do not do input_put_device() here because it will be done
2137                  * when 2nd devres fires up.
2138                  */
2139         } else {
2140                 __input_unregister_device(dev);
2141                 input_put_device(dev);
2142         }
2143 }
2144 EXPORT_SYMBOL(input_unregister_device);
2145
2146 /**
2147  * input_register_handler - register a new input handler
2148  * @handler: handler to be registered
2149  *
2150  * This function registers a new input handler (interface) for input
2151  * devices in the system and attaches it to all input devices that
2152  * are compatible with the handler.
2153  */
2154 int input_register_handler(struct input_handler *handler)
2155 {
2156         struct input_dev *dev;
2157         int error;
2158
2159         error = mutex_lock_interruptible(&input_mutex);
2160         if (error)
2161                 return error;
2162
2163         INIT_LIST_HEAD(&handler->h_list);
2164
2165         list_add_tail(&handler->node, &input_handler_list);
2166
2167         list_for_each_entry(dev, &input_dev_list, node)
2168                 input_attach_handler(dev, handler);
2169
2170         input_wakeup_procfs_readers();
2171
2172         mutex_unlock(&input_mutex);
2173         return 0;
2174 }
2175 EXPORT_SYMBOL(input_register_handler);
2176
2177 /**
2178  * input_unregister_handler - unregisters an input handler
2179  * @handler: handler to be unregistered
2180  *
2181  * This function disconnects a handler from its input devices and
2182  * removes it from lists of known handlers.
2183  */
2184 void input_unregister_handler(struct input_handler *handler)
2185 {
2186         struct input_handle *handle, *next;
2187
2188         mutex_lock(&input_mutex);
2189
2190         list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2191                 handler->disconnect(handle);
2192         WARN_ON(!list_empty(&handler->h_list));
2193
2194         list_del_init(&handler->node);
2195
2196         input_wakeup_procfs_readers();
2197
2198         mutex_unlock(&input_mutex);
2199 }
2200 EXPORT_SYMBOL(input_unregister_handler);
2201
2202 /**
2203  * input_handler_for_each_handle - handle iterator
2204  * @handler: input handler to iterate
2205  * @data: data for the callback
2206  * @fn: function to be called for each handle
2207  *
2208  * Iterate over @bus's list of devices, and call @fn for each, passing
2209  * it @data and stop when @fn returns a non-zero value. The function is
2210  * using RCU to traverse the list and therefore may be usind in atonic
2211  * contexts. The @fn callback is invoked from RCU critical section and
2212  * thus must not sleep.
2213  */
2214 int input_handler_for_each_handle(struct input_handler *handler, void *data,
2215                                   int (*fn)(struct input_handle *, void *))
2216 {
2217         struct input_handle *handle;
2218         int retval = 0;
2219
2220         rcu_read_lock();
2221
2222         list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2223                 retval = fn(handle, data);
2224                 if (retval)
2225                         break;
2226         }
2227
2228         rcu_read_unlock();
2229
2230         return retval;
2231 }
2232 EXPORT_SYMBOL(input_handler_for_each_handle);
2233
2234 /**
2235  * input_register_handle - register a new input handle
2236  * @handle: handle to register
2237  *
2238  * This function puts a new input handle onto device's
2239  * and handler's lists so that events can flow through
2240  * it once it is opened using input_open_device().
2241  *
2242  * This function is supposed to be called from handler's
2243  * connect() method.
2244  */
2245 int input_register_handle(struct input_handle *handle)
2246 {
2247         struct input_handler *handler = handle->handler;
2248         struct input_dev *dev = handle->dev;
2249         int error;
2250
2251         /*
2252          * We take dev->mutex here to prevent race with
2253          * input_release_device().
2254          */
2255         error = mutex_lock_interruptible(&dev->mutex);
2256         if (error)
2257                 return error;
2258
2259         /*
2260          * Filters go to the head of the list, normal handlers
2261          * to the tail.
2262          */
2263         if (handler->filter)
2264                 list_add_rcu(&handle->d_node, &dev->h_list);
2265         else
2266                 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2267
2268         mutex_unlock(&dev->mutex);
2269
2270         /*
2271          * Since we are supposed to be called from ->connect()
2272          * which is mutually exclusive with ->disconnect()
2273          * we can't be racing with input_unregister_handle()
2274          * and so separate lock is not needed here.
2275          */
2276         list_add_tail_rcu(&handle->h_node, &handler->h_list);
2277
2278         if (handler->start)
2279                 handler->start(handle);
2280
2281         return 0;
2282 }
2283 EXPORT_SYMBOL(input_register_handle);
2284
2285 /**
2286  * input_unregister_handle - unregister an input handle
2287  * @handle: handle to unregister
2288  *
2289  * This function removes input handle from device's
2290  * and handler's lists.
2291  *
2292  * This function is supposed to be called from handler's
2293  * disconnect() method.
2294  */
2295 void input_unregister_handle(struct input_handle *handle)
2296 {
2297         struct input_dev *dev = handle->dev;
2298
2299         list_del_rcu(&handle->h_node);
2300
2301         /*
2302          * Take dev->mutex to prevent race with input_release_device().
2303          */
2304         mutex_lock(&dev->mutex);
2305         list_del_rcu(&handle->d_node);
2306         mutex_unlock(&dev->mutex);
2307
2308         synchronize_rcu();
2309 }
2310 EXPORT_SYMBOL(input_unregister_handle);
2311
2312 /**
2313  * input_get_new_minor - allocates a new input minor number
2314  * @legacy_base: beginning or the legacy range to be searched
2315  * @legacy_num: size of legacy range
2316  * @allow_dynamic: whether we can also take ID from the dynamic range
2317  *
2318  * This function allocates a new device minor for from input major namespace.
2319  * Caller can request legacy minor by specifying @legacy_base and @legacy_num
2320  * parameters and whether ID can be allocated from dynamic range if there are
2321  * no free IDs in legacy range.
2322  */
2323 int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2324                         bool allow_dynamic)
2325 {
2326         /*
2327          * This function should be called from input handler's ->connect()
2328          * methods, which are serialized with input_mutex, so no additional
2329          * locking is needed here.
2330          */
2331         if (legacy_base >= 0) {
2332                 int minor = ida_simple_get(&input_ida,
2333                                            legacy_base,
2334                                            legacy_base + legacy_num,
2335                                            GFP_KERNEL);
2336                 if (minor >= 0 || !allow_dynamic)
2337                         return minor;
2338         }
2339
2340         return ida_simple_get(&input_ida,
2341                               INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2342                               GFP_KERNEL);
2343 }
2344 EXPORT_SYMBOL(input_get_new_minor);
2345
2346 /**
2347  * input_free_minor - release previously allocated minor
2348  * @minor: minor to be released
2349  *
2350  * This function releases previously allocated input minor so that it can be
2351  * reused later.
2352  */
2353 void input_free_minor(unsigned int minor)
2354 {
2355         ida_simple_remove(&input_ida, minor);
2356 }
2357 EXPORT_SYMBOL(input_free_minor);
2358
2359 static int __init input_init(void)
2360 {
2361         int err;
2362
2363         err = class_register(&input_class);
2364         if (err) {
2365                 pr_err("unable to register input_dev class\n");
2366                 return err;
2367         }
2368
2369         err = input_proc_init();
2370         if (err)
2371                 goto fail1;
2372
2373         err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2374                                      INPUT_MAX_CHAR_DEVICES, "input");
2375         if (err) {
2376                 pr_err("unable to register char major %d", INPUT_MAJOR);
2377                 goto fail2;
2378         }
2379
2380         return 0;
2381
2382  fail2: input_proc_exit();
2383  fail1: class_unregister(&input_class);
2384         return err;
2385 }
2386
2387 static void __exit input_exit(void)
2388 {
2389         input_proc_exit();
2390         unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2391                                  INPUT_MAX_CHAR_DEVICES);
2392         class_unregister(&input_class);
2393 }
2394
2395 subsys_initcall(input_init);
2396 module_exit(input_exit);