net/rfkill/core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2006 - 2007 Ivo van Doorn
   4  * Copyright (C) 2007 Dmitry Torokhov
   5  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/capability.h>
  13 #include <linux/list.h>
  14 #include <linux/mutex.h>
  15 #include <linux/rfkill.h>
  16 #include <linux/sched.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/device.h>
  19 #include <linux/miscdevice.h>
  20 #include <linux/wait.h>
  21 #include <linux/poll.h>
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24
  25 #include "rfkill.h"
  26
  27 #define POLL_INTERVAL           (5 * HZ)
  28
  29 #define RFKILL_BLOCK_HW         BIT(0)
  30 #define RFKILL_BLOCK_SW         BIT(1)
  31 #define RFKILL_BLOCK_SW_PREV    BIT(2)
  32 #define RFKILL_BLOCK_ANY        (RFKILL_BLOCK_HW |\
  33                                  RFKILL_BLOCK_SW |\
  34                                  RFKILL_BLOCK_SW_PREV)
  35 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
  36
  37 struct rfkill {
  38         spinlock_t              lock;
  39
  40         enum rfkill_type        type;
  41
  42         unsigned long           state;
  43         unsigned long           hard_block_reasons;
  44
  45         u32                     idx;
  46
  47         bool                    registered;
  48         bool                    persistent;
  49         bool                    polling_paused;
  50         bool                    suspended;
  51
  52         const struct rfkill_ops *ops;
  53         void                    *data;
  54
  55 #ifdef CONFIG_RFKILL_LEDS
  56         struct led_trigger      led_trigger;
  57         const char              *ledtrigname;
  58 #endif
  59
  60         struct device           dev;
  61         struct list_head        node;
  62
  63         struct delayed_work     poll_work;
  64         struct work_struct      uevent_work;
  65         struct work_struct      sync_work;
  66         char                    name[];
  67 };
  68 #define to_rfkill(d)    container_of(d, struct rfkill, dev)
  69
  70 struct rfkill_int_event {
  71         struct list_head        list;
  72         struct rfkill_event     ev;
  73 };
  74
  75 struct rfkill_data {
  76         struct list_head        list;
  77         struct list_head        events;
  78         struct mutex            mtx;
  79         wait_queue_head_t       read_wait;
  80         bool                    input_handler;
  81 };
  82
  83
  84 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  85 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  86 MODULE_DESCRIPTION("RF switch support");
  87 MODULE_LICENSE("GPL");
  88
  89
  90 /*
  91  * The locking here should be made much smarter, we currently have
  92  * a bit of a stupid situation because drivers might want to register
  93  * the rfkill struct under their own lock, and take this lock during
  94  * rfkill method calls -- which will cause an AB-BA deadlock situation.
  95  *
  96  * To fix that, we need to rework this code here to be mostly lock-free
  97  * and only use the mutex for list manipulations, not to protect the
  98  * various other global variables. Then we can avoid holding the mutex
  99  * around driver operations, and all is happy.
 100  */
 101 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 102 static DEFINE_MUTEX(rfkill_global_mutex);
 103 static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 104
 105 static unsigned int rfkill_default_state = 1;
 106 module_param_named(default_state, rfkill_default_state, uint, 0444);
 107 MODULE_PARM_DESC(default_state,
 108                  "Default initial state for all radio types, 0 = radio off");
 109
 110 static struct {
 111         bool cur, sav;
 112 } rfkill_global_states[NUM_RFKILL_TYPES];
 113
 114 static bool rfkill_epo_lock_active;
 115
 116
 117 #ifdef CONFIG_RFKILL_LEDS
 118 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 119 {
 120         struct led_trigger *trigger;
 121
 122         if (!rfkill->registered)
 123                 return;
 124
 125         trigger = &rfkill->led_trigger;
 126
 127         if (rfkill->state & RFKILL_BLOCK_ANY)
 128                 led_trigger_event(trigger, LED_OFF);
 129         else
 130                 led_trigger_event(trigger, LED_FULL);
 131 }
 132
 133 static int rfkill_led_trigger_activate(struct led_classdev *led)
 134 {
 135         struct rfkill *rfkill;
 136
 137         rfkill = container_of(led->trigger, struct rfkill, led_trigger);
 138
 139         rfkill_led_trigger_event(rfkill);
 140
 141         return 0;
 142 }
 143
 144 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 145 {
 146         return rfkill->led_trigger.name;
 147 }
 148 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 149
 150 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 151 {
 152         BUG_ON(!rfkill);
 153
 154         rfkill->ledtrigname = name;
 155 }
 156 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 157
 158 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 159 {
 160         rfkill->led_trigger.name = rfkill->ledtrigname
 161                                         ? : dev_name(&rfkill->dev);
 162         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 163         return led_trigger_register(&rfkill->led_trigger);
 164 }
 165
 166 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 167 {
 168         led_trigger_unregister(&rfkill->led_trigger);
 169 }
 170
 171 static struct led_trigger rfkill_any_led_trigger;
 172 static struct led_trigger rfkill_none_led_trigger;
 173 static struct work_struct rfkill_global_led_trigger_work;
 174
 175 static void rfkill_global_led_trigger_worker(struct work_struct *work)
 176 {
 177         enum led_brightness brightness = LED_OFF;
 178         struct rfkill *rfkill;
 179
 180         mutex_lock(&rfkill_global_mutex);
 181         list_for_each_entry(rfkill, &rfkill_list, node) {
 182                 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
 183                         brightness = LED_FULL;
 184                         break;
 185                 }
 186         }
 187         mutex_unlock(&rfkill_global_mutex);
 188
 189         led_trigger_event(&rfkill_any_led_trigger, brightness);
 190         led_trigger_event(&rfkill_none_led_trigger,
 191                           brightness == LED_OFF ? LED_FULL : LED_OFF);
 192 }
 193
 194 static void rfkill_global_led_trigger_event(void)
 195 {
 196         schedule_work(&rfkill_global_led_trigger_work);
 197 }
 198
 199 static int rfkill_global_led_trigger_register(void)
 200 {
 201         int ret;
 202
 203         INIT_WORK(&rfkill_global_led_trigger_work,
 204                         rfkill_global_led_trigger_worker);
 205
 206         rfkill_any_led_trigger.name = "rfkill-any";
 207         ret = led_trigger_register(&rfkill_any_led_trigger);
 208         if (ret)
 209                 return ret;
 210
 211         rfkill_none_led_trigger.name = "rfkill-none";
 212         ret = led_trigger_register(&rfkill_none_led_trigger);
 213         if (ret)
 214                 led_trigger_unregister(&rfkill_any_led_trigger);
 215         else
 216                 /* Delay activation until all global triggers are registered */
 217                 rfkill_global_led_trigger_event();
 218
 219         return ret;
 220 }
 221
 222 static void rfkill_global_led_trigger_unregister(void)
 223 {
 224         led_trigger_unregister(&rfkill_none_led_trigger);
 225         led_trigger_unregister(&rfkill_any_led_trigger);
 226         cancel_work_sync(&rfkill_global_led_trigger_work);
 227 }
 228 #else
 229 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 230 {
 231 }
 232
 233 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 234 {
 235         return 0;
 236 }
 237
 238 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 239 {
 240 }
 241
 242 static void rfkill_global_led_trigger_event(void)
 243 {
 244 }
 245
 246 static int rfkill_global_led_trigger_register(void)
 247 {
 248         return 0;
 249 }
 250
 251 static void rfkill_global_led_trigger_unregister(void)
 252 {
 253 }
 254 #endif /* CONFIG_RFKILL_LEDS */
 255
 256 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
 257                               enum rfkill_operation op)
 258 {
 259         unsigned long flags;
 260
 261         ev->idx = rfkill->idx;
 262         ev->type = rfkill->type;
 263         ev->op = op;
 264
 265         spin_lock_irqsave(&rfkill->lock, flags);
 266         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 267         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 268                                         RFKILL_BLOCK_SW_PREV));
 269         ev->hard_block_reasons = rfkill->hard_block_reasons;
 270         spin_unlock_irqrestore(&rfkill->lock, flags);
 271 }
 272
 273 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 274 {
 275         struct rfkill_data *data;
 276         struct rfkill_int_event *ev;
 277
 278         list_for_each_entry(data, &rfkill_fds, list) {
 279                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 280                 if (!ev)
 281                         continue;
 282                 rfkill_fill_event(&ev->ev, rfkill, op);
 283                 mutex_lock(&data->mtx);
 284                 list_add_tail(&ev->list, &data->events);
 285                 mutex_unlock(&data->mtx);
 286                 wake_up_interruptible(&data->read_wait);
 287         }
 288 }
 289
 290 static void rfkill_event(struct rfkill *rfkill)
 291 {
 292         if (!rfkill->registered)
 293                 return;
 294
 295         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 296
 297         /* also send event to /dev/rfkill */
 298         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 299 }
 300
 301 /**
 302  * rfkill_set_block - wrapper for set_block method
 303  *
 304  * @rfkill: the rfkill struct to use
 305  * @blocked: the new software state
 306  *
 307  * Calls the set_block method (when applicable) and handles notifications
 308  * etc. as well.
 309  */
 310 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 311 {
 312         unsigned long flags;
 313         bool prev, curr;
 314         int err;
 315
 316         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 317                 return;
 318
 319         /*
 320          * Some platforms (...!) generate input events which affect the
 321          * _hard_ kill state -- whenever something tries to change the
 322          * current software state query the hardware state too.
 323          */
 324         if (rfkill->ops->query)
 325                 rfkill->ops->query(rfkill, rfkill->data);
 326
 327         spin_lock_irqsave(&rfkill->lock, flags);
 328         prev = rfkill->state & RFKILL_BLOCK_SW;
 329
 330         if (prev)
 331                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 332         else
 333                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 334
 335         if (blocked)
 336                 rfkill->state |= RFKILL_BLOCK_SW;
 337         else
 338                 rfkill->state &= ~RFKILL_BLOCK_SW;
 339
 340         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 341         spin_unlock_irqrestore(&rfkill->lock, flags);
 342
 343         err = rfkill->ops->set_block(rfkill->data, blocked);
 344
 345         spin_lock_irqsave(&rfkill->lock, flags);
 346         if (err) {
 347                 /*
 348                  * Failed -- reset status to _PREV, which may be different
 349                  * from what we have set _PREV to earlier in this function
 350                  * if rfkill_set_sw_state was invoked.
 351                  */
 352                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 353                         rfkill->state |= RFKILL_BLOCK_SW;
 354                 else
 355                         rfkill->state &= ~RFKILL_BLOCK_SW;
 356         }
 357         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 358         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 359         curr = rfkill->state & RFKILL_BLOCK_SW;
 360         spin_unlock_irqrestore(&rfkill->lock, flags);
 361
 362         rfkill_led_trigger_event(rfkill);
 363         rfkill_global_led_trigger_event();
 364
 365         if (prev != curr)
 366                 rfkill_event(rfkill);
 367 }
 368
 369 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 370 {
 371         int i;
 372
 373         if (type != RFKILL_TYPE_ALL) {
 374                 rfkill_global_states[type].cur = blocked;
 375                 return;
 376         }
 377
 378         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 379                 rfkill_global_states[i].cur = blocked;
 380 }
 381
 382 #ifdef CONFIG_RFKILL_INPUT
 383 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 384
 385 /**
 386  * __rfkill_switch_all - Toggle state of all switches of given type
 387  * @type: type of interfaces to be affected
 388  * @blocked: the new state
 389  *
 390  * This function sets the state of all switches of given type,
 391  * unless a specific switch is suspended.
 392  *
 393  * Caller must have acquired rfkill_global_mutex.
 394  */
 395 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 396 {
 397         struct rfkill *rfkill;
 398
 399         rfkill_update_global_state(type, blocked);
 400         list_for_each_entry(rfkill, &rfkill_list, node) {
 401                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 402                         continue;
 403
 404                 rfkill_set_block(rfkill, blocked);
 405         }
 406 }
 407
 408 /**
 409  * rfkill_switch_all - Toggle state of all switches of given type
 410  * @type: type of interfaces to be affected
 411  * @blocked: the new state
 412  *
 413  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 414  * Please refer to __rfkill_switch_all() for details.
 415  *
 416  * Does nothing if the EPO lock is active.
 417  */
 418 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 419 {
 420         if (atomic_read(&rfkill_input_disabled))
 421                 return;
 422
 423         mutex_lock(&rfkill_global_mutex);
 424
 425         if (!rfkill_epo_lock_active)
 426                 __rfkill_switch_all(type, blocked);
 427
 428         mutex_unlock(&rfkill_global_mutex);
 429 }
 430
 431 /**
 432  * rfkill_epo - emergency power off all transmitters
 433  *
 434  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 435  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 436  *
 437  * The global state before the EPO is saved and can be restored later
 438  * using rfkill_restore_states().
 439  */
 440 void rfkill_epo(void)
 441 {
 442         struct rfkill *rfkill;
 443         int i;
 444
 445         if (atomic_read(&rfkill_input_disabled))
 446                 return;
 447
 448         mutex_lock(&rfkill_global_mutex);
 449
 450         rfkill_epo_lock_active = true;
 451         list_for_each_entry(rfkill, &rfkill_list, node)
 452                 rfkill_set_block(rfkill, true);
 453
 454         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 455                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 456                 rfkill_global_states[i].cur = true;
 457         }
 458
 459         mutex_unlock(&rfkill_global_mutex);
 460 }
 461
 462 /**
 463  * rfkill_restore_states - restore global states
 464  *
 465  * Restore (and sync switches to) the global state from the
 466  * states in rfkill_default_states.  This can undo the effects of
 467  * a call to rfkill_epo().
 468  */
 469 void rfkill_restore_states(void)
 470 {
 471         int i;
 472
 473         if (atomic_read(&rfkill_input_disabled))
 474                 return;
 475
 476         mutex_lock(&rfkill_global_mutex);
 477
 478         rfkill_epo_lock_active = false;
 479         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 480                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 481         mutex_unlock(&rfkill_global_mutex);
 482 }
 483
 484 /**
 485  * rfkill_remove_epo_lock - unlock state changes
 486  *
 487  * Used by rfkill-input manually unlock state changes, when
 488  * the EPO switch is deactivated.
 489  */
 490 void rfkill_remove_epo_lock(void)
 491 {
 492         if (atomic_read(&rfkill_input_disabled))
 493                 return;
 494
 495         mutex_lock(&rfkill_global_mutex);
 496         rfkill_epo_lock_active = false;
 497         mutex_unlock(&rfkill_global_mutex);
 498 }
 499
 500 /**
 501  * rfkill_is_epo_lock_active - returns true EPO is active
 502  *
 503  * Returns 0 (false) if there is NOT an active EPO condition,
 504  * and 1 (true) if there is an active EPO condition, which
 505  * locks all radios in one of the BLOCKED states.
 506  *
 507  * Can be called in atomic context.
 508  */
 509 bool rfkill_is_epo_lock_active(void)
 510 {
 511         return rfkill_epo_lock_active;
 512 }
 513
 514 /**
 515  * rfkill_get_global_sw_state - returns global state for a type
 516  * @type: the type to get the global state of
 517  *
 518  * Returns the current global state for a given wireless
 519  * device type.
 520  */
 521 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 522 {
 523         return rfkill_global_states[type].cur;
 524 }
 525 #endif
 526
 527 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 528                                 bool blocked, unsigned long reason)
 529 {
 530         unsigned long flags;
 531         bool ret, prev;
 532
 533         BUG_ON(!rfkill);
 534
 535         if (WARN(reason &
 536             ~(RFKILL_HARD_BLOCK_SIGNAL | RFKILL_HARD_BLOCK_NOT_OWNER),
 537             "hw_state reason not supported: 0x%lx", reason))
 538                 return blocked;
 539
 540         spin_lock_irqsave(&rfkill->lock, flags);
 541         prev = !!(rfkill->hard_block_reasons & reason);
 542         if (blocked) {
 543                 rfkill->state |= RFKILL_BLOCK_HW;
 544                 rfkill->hard_block_reasons |= reason;
 545         } else {
 546                 rfkill->hard_block_reasons &= ~reason;
 547                 if (!rfkill->hard_block_reasons)
 548                         rfkill->state &= ~RFKILL_BLOCK_HW;
 549         }
 550         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 551         spin_unlock_irqrestore(&rfkill->lock, flags);
 552
 553         rfkill_led_trigger_event(rfkill);
 554         rfkill_global_led_trigger_event();
 555
 556         if (rfkill->registered && prev != blocked)
 557                 schedule_work(&rfkill->uevent_work);
 558
 559         return ret;
 560 }
 561 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
 562
 563 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 564 {
 565         u32 bit = RFKILL_BLOCK_SW;
 566
 567         /* if in a ops->set_block right now, use other bit */
 568         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 569                 bit = RFKILL_BLOCK_SW_PREV;
 570
 571         if (blocked)
 572                 rfkill->state |= bit;
 573         else
 574                 rfkill->state &= ~bit;
 575 }
 576
 577 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 578 {
 579         unsigned long flags;
 580         bool prev, hwblock;
 581
 582         BUG_ON(!rfkill);
 583
 584         spin_lock_irqsave(&rfkill->lock, flags);
 585         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 586         __rfkill_set_sw_state(rfkill, blocked);
 587         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 588         blocked = blocked || hwblock;
 589         spin_unlock_irqrestore(&rfkill->lock, flags);
 590
 591         if (!rfkill->registered)
 592                 return blocked;
 593
 594         if (prev != blocked && !hwblock)
 595                 schedule_work(&rfkill->uevent_work);
 596
 597         rfkill_led_trigger_event(rfkill);
 598         rfkill_global_led_trigger_event();
 599
 600         return blocked;
 601 }
 602 EXPORT_SYMBOL(rfkill_set_sw_state);
 603
 604 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 605 {
 606         unsigned long flags;
 607
 608         BUG_ON(!rfkill);
 609         BUG_ON(rfkill->registered);
 610
 611         spin_lock_irqsave(&rfkill->lock, flags);
 612         __rfkill_set_sw_state(rfkill, blocked);
 613         rfkill->persistent = true;
 614         spin_unlock_irqrestore(&rfkill->lock, flags);
 615 }
 616 EXPORT_SYMBOL(rfkill_init_sw_state);
 617
 618 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 619 {
 620         unsigned long flags;
 621         bool swprev, hwprev;
 622
 623         BUG_ON(!rfkill);
 624
 625         spin_lock_irqsave(&rfkill->lock, flags);
 626
 627         /*
 628          * No need to care about prev/setblock ... this is for uevent only
 629          * and that will get triggered by rfkill_set_block anyway.
 630          */
 631         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 632         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 633         __rfkill_set_sw_state(rfkill, sw);
 634         if (hw)
 635                 rfkill->state |= RFKILL_BLOCK_HW;
 636         else
 637                 rfkill->state &= ~RFKILL_BLOCK_HW;
 638
 639         spin_unlock_irqrestore(&rfkill->lock, flags);
 640
 641         if (!rfkill->registered) {
 642                 rfkill->persistent = true;
 643         } else {
 644                 if (swprev != sw || hwprev != hw)
 645                         schedule_work(&rfkill->uevent_work);
 646
 647                 rfkill_led_trigger_event(rfkill);
 648                 rfkill_global_led_trigger_event();
 649         }
 650 }
 651 EXPORT_SYMBOL(rfkill_set_states);
 652
 653 static const char * const rfkill_types[] = {
 654         NULL, /* RFKILL_TYPE_ALL */
 655         "wlan",
 656         "bluetooth",
 657         "ultrawideband",
 658         "wimax",
 659         "wwan",
 660         "gps",
 661         "fm",
 662         "nfc",
 663 };
 664
 665 enum rfkill_type rfkill_find_type(const char *name)
 666 {
 667         int i;
 668
 669         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 670
 671         if (!name)
 672                 return RFKILL_TYPE_ALL;
 673
 674         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 675                 if (!strcmp(name, rfkill_types[i]))
 676                         return i;
 677         return RFKILL_TYPE_ALL;
 678 }
 679 EXPORT_SYMBOL(rfkill_find_type);
 680
 681 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 682                          char *buf)
 683 {
 684         struct rfkill *rfkill = to_rfkill(dev);
 685
 686         return sprintf(buf, "%s\n", rfkill->name);
 687 }
 688 static DEVICE_ATTR_RO(name);
 689
 690 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 691                          char *buf)
 692 {
 693         struct rfkill *rfkill = to_rfkill(dev);
 694
 695         return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
 696 }
 697 static DEVICE_ATTR_RO(type);
 698
 699 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 700                           char *buf)
 701 {
 702         struct rfkill *rfkill = to_rfkill(dev);
 703
 704         return sprintf(buf, "%d\n", rfkill->idx);
 705 }
 706 static DEVICE_ATTR_RO(index);
 707
 708 static ssize_t persistent_show(struct device *dev,
 709                                struct device_attribute *attr, char *buf)
 710 {
 711         struct rfkill *rfkill = to_rfkill(dev);
 712
 713         return sprintf(buf, "%d\n", rfkill->persistent);
 714 }
 715 static DEVICE_ATTR_RO(persistent);
 716
 717 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 718                          char *buf)
 719 {
 720         struct rfkill *rfkill = to_rfkill(dev);
 721
 722         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 723 }
 724 static DEVICE_ATTR_RO(hard);
 725
 726 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 727                          char *buf)
 728 {
 729         struct rfkill *rfkill = to_rfkill(dev);
 730
 731         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 732 }
 733
 734 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 735                           const char *buf, size_t count)
 736 {
 737         struct rfkill *rfkill = to_rfkill(dev);
 738         unsigned long state;
 739         int err;
 740
 741         if (!capable(CAP_NET_ADMIN))
 742                 return -EPERM;
 743
 744         err = kstrtoul(buf, 0, &state);
 745         if (err)
 746                 return err;
 747
 748         if (state > 1 )
 749                 return -EINVAL;
 750
 751         mutex_lock(&rfkill_global_mutex);
 752         rfkill_set_block(rfkill, state);
 753         mutex_unlock(&rfkill_global_mutex);
 754
 755         return count;
 756 }
 757 static DEVICE_ATTR_RW(soft);
 758
 759 static ssize_t hard_block_reasons_show(struct device *dev,
 760                                        struct device_attribute *attr,
 761                                        char *buf)
 762 {
 763         struct rfkill *rfkill = to_rfkill(dev);
 764
 765         return sprintf(buf, "0x%lx\n", rfkill->hard_block_reasons);
 766 }
 767 static DEVICE_ATTR_RO(hard_block_reasons);
 768
 769 static u8 user_state_from_blocked(unsigned long state)
 770 {
 771         if (state & RFKILL_BLOCK_HW)
 772                 return RFKILL_USER_STATE_HARD_BLOCKED;
 773         if (state & RFKILL_BLOCK_SW)
 774                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 775
 776         return RFKILL_USER_STATE_UNBLOCKED;
 777 }
 778
 779 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 780                           char *buf)
 781 {
 782         struct rfkill *rfkill = to_rfkill(dev);
 783
 784         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 785 }
 786
 787 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 788                            const char *buf, size_t count)
 789 {
 790         struct rfkill *rfkill = to_rfkill(dev);
 791         unsigned long state;
 792         int err;
 793
 794         if (!capable(CAP_NET_ADMIN))
 795                 return -EPERM;
 796
 797         err = kstrtoul(buf, 0, &state);
 798         if (err)
 799                 return err;
 800
 801         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 802             state != RFKILL_USER_STATE_UNBLOCKED)
 803                 return -EINVAL;
 804
 805         mutex_lock(&rfkill_global_mutex);
 806         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 807         mutex_unlock(&rfkill_global_mutex);
 808
 809         return count;
 810 }
 811 static DEVICE_ATTR_RW(state);
 812
 813 static struct attribute *rfkill_dev_attrs[] = {
 814         &dev_attr_name.attr,
 815         &dev_attr_type.attr,
 816         &dev_attr_index.attr,
 817         &dev_attr_persistent.attr,
 818         &dev_attr_state.attr,
 819         &dev_attr_soft.attr,
 820         &dev_attr_hard.attr,
 821         &dev_attr_hard_block_reasons.attr,
 822         NULL,
 823 };
 824 ATTRIBUTE_GROUPS(rfkill_dev);
 825
 826 static void rfkill_release(struct device *dev)
 827 {
 828         struct rfkill *rfkill = to_rfkill(dev);
 829
 830         kfree(rfkill);
 831 }
 832
 833 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 834 {
 835         struct rfkill *rfkill = to_rfkill(dev);
 836         unsigned long flags;
 837         unsigned long reasons;
 838         u32 state;
 839         int error;
 840
 841         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 842         if (error)
 843                 return error;
 844         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 845                                rfkill_types[rfkill->type]);
 846         if (error)
 847                 return error;
 848         spin_lock_irqsave(&rfkill->lock, flags);
 849         state = rfkill->state;
 850         reasons = rfkill->hard_block_reasons;
 851         spin_unlock_irqrestore(&rfkill->lock, flags);
 852         error = add_uevent_var(env, "RFKILL_STATE=%d",
 853                                user_state_from_blocked(state));
 854         if (error)
 855                 return error;
 856         return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
 857 }
 858
 859 void rfkill_pause_polling(struct rfkill *rfkill)
 860 {
 861         BUG_ON(!rfkill);
 862
 863         if (!rfkill->ops->poll)
 864                 return;
 865
 866         rfkill->polling_paused = true;
 867         cancel_delayed_work_sync(&rfkill->poll_work);
 868 }
 869 EXPORT_SYMBOL(rfkill_pause_polling);
 870
 871 void rfkill_resume_polling(struct rfkill *rfkill)
 872 {
 873         BUG_ON(!rfkill);
 874
 875         if (!rfkill->ops->poll)
 876                 return;
 877
 878         rfkill->polling_paused = false;
 879
 880         if (rfkill->suspended)
 881                 return;
 882
 883         queue_delayed_work(system_power_efficient_wq,
 884                            &rfkill->poll_work, 0);
 885 }
 886 EXPORT_SYMBOL(rfkill_resume_polling);
 887
 888 #ifdef CONFIG_PM_SLEEP
 889 static int rfkill_suspend(struct device *dev)
 890 {
 891         struct rfkill *rfkill = to_rfkill(dev);
 892
 893         rfkill->suspended = true;
 894         cancel_delayed_work_sync(&rfkill->poll_work);
 895
 896         return 0;
 897 }
 898
 899 static int rfkill_resume(struct device *dev)
 900 {
 901         struct rfkill *rfkill = to_rfkill(dev);
 902         bool cur;
 903
 904         rfkill->suspended = false;
 905
 906         if (!rfkill->registered)
 907                 return 0;
 908
 909         if (!rfkill->persistent) {
 910                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 911                 rfkill_set_block(rfkill, cur);
 912         }
 913
 914         if (rfkill->ops->poll && !rfkill->polling_paused)
 915                 queue_delayed_work(system_power_efficient_wq,
 916                                    &rfkill->poll_work, 0);
 917
 918         return 0;
 919 }
 920
 921 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 922 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 923 #else
 924 #define RFKILL_PM_OPS NULL
 925 #endif
 926
 927 static struct class rfkill_class = {
 928         .name           = "rfkill",
 929         .dev_release    = rfkill_release,
 930         .dev_groups     = rfkill_dev_groups,
 931         .dev_uevent     = rfkill_dev_uevent,
 932         .pm             = RFKILL_PM_OPS,
 933 };
 934
 935 bool rfkill_blocked(struct rfkill *rfkill)
 936 {
 937         unsigned long flags;
 938         u32 state;
 939
 940         spin_lock_irqsave(&rfkill->lock, flags);
 941         state = rfkill->state;
 942         spin_unlock_irqrestore(&rfkill->lock, flags);
 943
 944         return !!(state & RFKILL_BLOCK_ANY);
 945 }
 946 EXPORT_SYMBOL(rfkill_blocked);
 947
 948
 949 struct rfkill * __must_check rfkill_alloc(const char *name,
 950                                           struct device *parent,
 951                                           const enum rfkill_type type,
 952                                           const struct rfkill_ops *ops,
 953                                           void *ops_data)
 954 {
 955         struct rfkill *rfkill;
 956         struct device *dev;
 957
 958         if (WARN_ON(!ops))
 959                 return NULL;
 960
 961         if (WARN_ON(!ops->set_block))
 962                 return NULL;
 963
 964         if (WARN_ON(!name))
 965                 return NULL;
 966
 967         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 968                 return NULL;
 969
 970         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 971         if (!rfkill)
 972                 return NULL;
 973
 974         spin_lock_init(&rfkill->lock);
 975         INIT_LIST_HEAD(&rfkill->node);
 976         rfkill->type = type;
 977         strcpy(rfkill->name, name);
 978         rfkill->ops = ops;
 979         rfkill->data = ops_data;
 980
 981         dev = &rfkill->dev;
 982         dev->class = &rfkill_class;
 983         dev->parent = parent;
 984         device_initialize(dev);
 985
 986         return rfkill;
 987 }
 988 EXPORT_SYMBOL(rfkill_alloc);
 989
 990 static void rfkill_poll(struct work_struct *work)
 991 {
 992         struct rfkill *rfkill;
 993
 994         rfkill = container_of(work, struct rfkill, poll_work.work);
 995
 996         /*
 997          * Poll hardware state -- driver will use one of the
 998          * rfkill_set{,_hw,_sw}_state functions and use its
 999          * return value to update the current status.
1000          */
1001         rfkill->ops->poll(rfkill, rfkill->data);
1002
1003         queue_delayed_work(system_power_efficient_wq,
1004                 &rfkill->poll_work,
1005                 round_jiffies_relative(POLL_INTERVAL));
1006 }
1007
1008 static void rfkill_uevent_work(struct work_struct *work)
1009 {
1010         struct rfkill *rfkill;
1011
1012         rfkill = container_of(work, struct rfkill, uevent_work);
1013
1014         mutex_lock(&rfkill_global_mutex);
1015         rfkill_event(rfkill);
1016         mutex_unlock(&rfkill_global_mutex);
1017 }
1018
1019 static void rfkill_sync_work(struct work_struct *work)
1020 {
1021         struct rfkill *rfkill;
1022         bool cur;
1023
1024         rfkill = container_of(work, struct rfkill, sync_work);
1025
1026         mutex_lock(&rfkill_global_mutex);
1027         cur = rfkill_global_states[rfkill->type].cur;
1028         rfkill_set_block(rfkill, cur);
1029         mutex_unlock(&rfkill_global_mutex);
1030 }
1031
1032 int __must_check rfkill_register(struct rfkill *rfkill)
1033 {
1034         static unsigned long rfkill_no;
1035         struct device *dev;
1036         int error;
1037
1038         if (!rfkill)
1039                 return -EINVAL;
1040
1041         dev = &rfkill->dev;
1042
1043         mutex_lock(&rfkill_global_mutex);
1044
1045         if (rfkill->registered) {
1046                 error = -EALREADY;
1047                 goto unlock;
1048         }
1049
1050         rfkill->idx = rfkill_no;
1051         dev_set_name(dev, "rfkill%lu", rfkill_no);
1052         rfkill_no++;
1053
1054         list_add_tail(&rfkill->node, &rfkill_list);
1055
1056         error = device_add(dev);
1057         if (error)
1058                 goto remove;
1059
1060         error = rfkill_led_trigger_register(rfkill);
1061         if (error)
1062                 goto devdel;
1063
1064         rfkill->registered = true;
1065
1066         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1067         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1068         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1069
1070         if (rfkill->ops->poll)
1071                 queue_delayed_work(system_power_efficient_wq,
1072                         &rfkill->poll_work,
1073                         round_jiffies_relative(POLL_INTERVAL));
1074
1075         if (!rfkill->persistent || rfkill_epo_lock_active) {
1076                 schedule_work(&rfkill->sync_work);
1077         } else {
1078 #ifdef CONFIG_RFKILL_INPUT
1079                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1080
1081                 if (!atomic_read(&rfkill_input_disabled))
1082                         __rfkill_switch_all(rfkill->type, soft_blocked);
1083 #endif
1084         }
1085
1086         rfkill_global_led_trigger_event();
1087         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1088
1089         mutex_unlock(&rfkill_global_mutex);
1090         return 0;
1091
1092  devdel:
1093         device_del(&rfkill->dev);
1094  remove:
1095         list_del_init(&rfkill->node);
1096  unlock:
1097         mutex_unlock(&rfkill_global_mutex);
1098         return error;
1099 }
1100 EXPORT_SYMBOL(rfkill_register);
1101
1102 void rfkill_unregister(struct rfkill *rfkill)
1103 {
1104         BUG_ON(!rfkill);
1105
1106         if (rfkill->ops->poll)
1107                 cancel_delayed_work_sync(&rfkill->poll_work);
1108
1109         cancel_work_sync(&rfkill->uevent_work);
1110         cancel_work_sync(&rfkill->sync_work);
1111
1112         rfkill->registered = false;
1113
1114         device_del(&rfkill->dev);
1115
1116         mutex_lock(&rfkill_global_mutex);
1117         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1118         list_del_init(&rfkill->node);
1119         rfkill_global_led_trigger_event();
1120         mutex_unlock(&rfkill_global_mutex);
1121
1122         rfkill_led_trigger_unregister(rfkill);
1123 }
1124 EXPORT_SYMBOL(rfkill_unregister);
1125
1126 void rfkill_destroy(struct rfkill *rfkill)
1127 {
1128         if (rfkill)
1129                 put_device(&rfkill->dev);
1130 }
1131 EXPORT_SYMBOL(rfkill_destroy);
1132
1133 static int rfkill_fop_open(struct inode *inode, struct file *file)
1134 {
1135         struct rfkill_data *data;
1136         struct rfkill *rfkill;
1137         struct rfkill_int_event *ev, *tmp;
1138
1139         data = kzalloc(sizeof(*data), GFP_KERNEL);
1140         if (!data)
1141                 return -ENOMEM;
1142
1143         INIT_LIST_HEAD(&data->events);
1144         mutex_init(&data->mtx);
1145         init_waitqueue_head(&data->read_wait);
1146
1147         mutex_lock(&rfkill_global_mutex);
1148         mutex_lock(&data->mtx);
1149         /*
1150          * start getting events from elsewhere but hold mtx to get
1151          * startup events added first
1152          */
1153
1154         list_for_each_entry(rfkill, &rfkill_list, node) {
1155                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1156                 if (!ev)
1157                         goto free;
1158                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1159                 list_add_tail(&ev->list, &data->events);
1160         }
1161         list_add(&data->list, &rfkill_fds);
1162         mutex_unlock(&data->mtx);
1163         mutex_unlock(&rfkill_global_mutex);
1164
1165         file->private_data = data;
1166
1167         return stream_open(inode, file);
1168
1169  free:
1170         mutex_unlock(&data->mtx);
1171         mutex_unlock(&rfkill_global_mutex);
1172         mutex_destroy(&data->mtx);
1173         list_for_each_entry_safe(ev, tmp, &data->events, list)
1174                 kfree(ev);
1175         kfree(data);
1176         return -ENOMEM;
1177 }
1178
1179 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1180 {
1181         struct rfkill_data *data = file->private_data;
1182         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1183
1184         poll_wait(file, &data->read_wait, wait);
1185
1186         mutex_lock(&data->mtx);
1187         if (!list_empty(&data->events))
1188                 res = EPOLLIN | EPOLLRDNORM;
1189         mutex_unlock(&data->mtx);
1190
1191         return res;
1192 }
1193
1194 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1195                                size_t count, loff_t *pos)
1196 {
1197         struct rfkill_data *data = file->private_data;
1198         struct rfkill_int_event *ev;
1199         unsigned long sz;
1200         int ret;
1201
1202         mutex_lock(&data->mtx);
1203
1204         while (list_empty(&data->events)) {
1205                 if (file->f_flags & O_NONBLOCK) {
1206                         ret = -EAGAIN;
1207                         goto out;
1208                 }
1209                 mutex_unlock(&data->mtx);
1210                 /* since we re-check and it just compares pointers,
1211                  * using !list_empty() without locking isn't a problem
1212                  */
1213                 ret = wait_event_interruptible(data->read_wait,
1214                                                !list_empty(&data->events));
1215                 mutex_lock(&data->mtx);
1216
1217                 if (ret)
1218                         goto out;
1219         }
1220
1221         ev = list_first_entry(&data->events, struct rfkill_int_event,
1222                                 list);
1223
1224         sz = min_t(unsigned long, sizeof(ev->ev), count);
1225         ret = sz;
1226         if (copy_to_user(buf, &ev->ev, sz))
1227                 ret = -EFAULT;
1228
1229         list_del(&ev->list);
1230         kfree(ev);
1231  out:
1232         mutex_unlock(&data->mtx);
1233         return ret;
1234 }
1235
1236 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1237                                 size_t count, loff_t *pos)
1238 {
1239         struct rfkill *rfkill;
1240         struct rfkill_event ev;
1241         int ret;
1242
1243         /* we don't need the 'hard' variable but accept it */
1244         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1245                 return -EINVAL;
1246
1247         /*
1248          * Copy as much data as we can accept into our 'ev' buffer,
1249          * but tell userspace how much we've copied so it can determine
1250          * our API version even in a write() call, if it cares.
1251          */
1252         count = min(count, sizeof(ev));
1253         if (copy_from_user(&ev, buf, count))
1254                 return -EFAULT;
1255
1256         if (ev.type >= NUM_RFKILL_TYPES)
1257                 return -EINVAL;
1258
1259         mutex_lock(&rfkill_global_mutex);
1260
1261         switch (ev.op) {
1262         case RFKILL_OP_CHANGE_ALL:
1263                 rfkill_update_global_state(ev.type, ev.soft);
1264                 list_for_each_entry(rfkill, &rfkill_list, node)
1265                         if (rfkill->type == ev.type ||
1266                             ev.type == RFKILL_TYPE_ALL)
1267                                 rfkill_set_block(rfkill, ev.soft);
1268                 ret = 0;
1269                 break;
1270         case RFKILL_OP_CHANGE:
1271                 list_for_each_entry(rfkill, &rfkill_list, node)
1272                         if (rfkill->idx == ev.idx &&
1273                             (rfkill->type == ev.type ||
1274                              ev.type == RFKILL_TYPE_ALL))
1275                                 rfkill_set_block(rfkill, ev.soft);
1276                 ret = 0;
1277                 break;
1278         default:
1279                 ret = -EINVAL;
1280                 break;
1281         }
1282
1283         mutex_unlock(&rfkill_global_mutex);
1284
1285         return ret ?: count;
1286 }
1287
1288 static int rfkill_fop_release(struct inode *inode, struct file *file)
1289 {
1290         struct rfkill_data *data = file->private_data;
1291         struct rfkill_int_event *ev, *tmp;
1292
1293         mutex_lock(&rfkill_global_mutex);
1294         list_del(&data->list);
1295         mutex_unlock(&rfkill_global_mutex);
1296
1297         mutex_destroy(&data->mtx);
1298         list_for_each_entry_safe(ev, tmp, &data->events, list)
1299                 kfree(ev);
1300
1301 #ifdef CONFIG_RFKILL_INPUT
1302         if (data->input_handler)
1303                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1304                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1305 #endif
1306
1307         kfree(data);
1308
1309         return 0;
1310 }
1311
1312 #ifdef CONFIG_RFKILL_INPUT
1313 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1314                              unsigned long arg)
1315 {
1316         struct rfkill_data *data = file->private_data;
1317
1318         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1319                 return -ENOSYS;
1320
1321         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1322                 return -ENOSYS;
1323
1324         mutex_lock(&data->mtx);
1325
1326         if (!data->input_handler) {
1327                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1328                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1329                 data->input_handler = true;
1330         }
1331
1332         mutex_unlock(&data->mtx);
1333
1334         return 0;
1335 }
1336 #endif
1337
1338 static const struct file_operations rfkill_fops = {
1339         .owner          = THIS_MODULE,
1340         .open           = rfkill_fop_open,
1341         .read           = rfkill_fop_read,
1342         .write          = rfkill_fop_write,
1343         .poll           = rfkill_fop_poll,
1344         .release        = rfkill_fop_release,
1345 #ifdef CONFIG_RFKILL_INPUT
1346         .unlocked_ioctl = rfkill_fop_ioctl,
1347         .compat_ioctl   = compat_ptr_ioctl,
1348 #endif
1349         .llseek         = no_llseek,
1350 };
1351
1352 #define RFKILL_NAME "rfkill"
1353
1354 static struct miscdevice rfkill_miscdev = {
1355         .fops   = &rfkill_fops,
1356         .name   = RFKILL_NAME,
1357         .minor  = RFKILL_MINOR,
1358 };
1359
1360 static int __init rfkill_init(void)
1361 {
1362         int error;
1363
1364         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1365
1366         error = class_register(&rfkill_class);
1367         if (error)
1368                 goto error_class;
1369
1370         error = misc_register(&rfkill_miscdev);
1371         if (error)
1372                 goto error_misc;
1373
1374         error = rfkill_global_led_trigger_register();
1375         if (error)
1376                 goto error_led_trigger;
1377
1378 #ifdef CONFIG_RFKILL_INPUT
1379         error = rfkill_handler_init();
1380         if (error)
1381                 goto error_input;
1382 #endif
1383
1384         return 0;
1385
1386 #ifdef CONFIG_RFKILL_INPUT
1387 error_input:
1388         rfkill_global_led_trigger_unregister();
1389 #endif
1390 error_led_trigger:
1391         misc_deregister(&rfkill_miscdev);
1392 error_misc:
1393         class_unregister(&rfkill_class);
1394 error_class:
1395         return error;
1396 }
1397 subsys_initcall(rfkill_init);
1398
1399 static void __exit rfkill_exit(void)
1400 {
1401 #ifdef CONFIG_RFKILL_INPUT
1402         rfkill_handler_exit();
1403 #endif
1404         rfkill_global_led_trigger_unregister();
1405         misc_deregister(&rfkill_miscdev);
1406         class_unregister(&rfkill_class);
1407 }
1408 module_exit(rfkill_exit);
1409
1410 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1411 MODULE_ALIAS("devname:" RFKILL_NAME);