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_ext 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_ext *ev,
 257                               struct rfkill *rfkill,
 258                               enum rfkill_operation op)
 259 {
 260         unsigned long flags;
 261
 262         ev->idx = rfkill->idx;
 263         ev->type = rfkill->type;
 264         ev->op = op;
 265
 266         spin_lock_irqsave(&rfkill->lock, flags);
 267         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 268         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 269                                         RFKILL_BLOCK_SW_PREV));
 270         ev->hard_block_reasons = rfkill->hard_block_reasons;
 271         spin_unlock_irqrestore(&rfkill->lock, flags);
 272 }
 273
 274 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 275 {
 276         struct rfkill_data *data;
 277         struct rfkill_int_event *ev;
 278
 279         list_for_each_entry(data, &rfkill_fds, list) {
 280                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 281                 if (!ev)
 282                         continue;
 283                 rfkill_fill_event(&ev->ev, rfkill, op);
 284                 mutex_lock(&data->mtx);
 285                 list_add_tail(&ev->list, &data->events);
 286                 mutex_unlock(&data->mtx);
 287                 wake_up_interruptible(&data->read_wait);
 288         }
 289 }
 290
 291 static void rfkill_event(struct rfkill *rfkill)
 292 {
 293         if (!rfkill->registered)
 294                 return;
 295
 296         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 297
 298         /* also send event to /dev/rfkill */
 299         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 300 }
 301
 302 /**
 303  * rfkill_set_block - wrapper for set_block method
 304  *
 305  * @rfkill: the rfkill struct to use
 306  * @blocked: the new software state
 307  *
 308  * Calls the set_block method (when applicable) and handles notifications
 309  * etc. as well.
 310  */
 311 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 312 {
 313         unsigned long flags;
 314         bool prev, curr;
 315         int err;
 316
 317         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 318                 return;
 319
 320         /*
 321          * Some platforms (...!) generate input events which affect the
 322          * _hard_ kill state -- whenever something tries to change the
 323          * current software state query the hardware state too.
 324          */
 325         if (rfkill->ops->query)
 326                 rfkill->ops->query(rfkill, rfkill->data);
 327
 328         spin_lock_irqsave(&rfkill->lock, flags);
 329         prev = rfkill->state & RFKILL_BLOCK_SW;
 330
 331         if (prev)
 332                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 333         else
 334                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 335
 336         if (blocked)
 337                 rfkill->state |= RFKILL_BLOCK_SW;
 338         else
 339                 rfkill->state &= ~RFKILL_BLOCK_SW;
 340
 341         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 342         spin_unlock_irqrestore(&rfkill->lock, flags);
 343
 344         err = rfkill->ops->set_block(rfkill->data, blocked);
 345
 346         spin_lock_irqsave(&rfkill->lock, flags);
 347         if (err) {
 348                 /*
 349                  * Failed -- reset status to _PREV, which may be different
 350                  * from what we have set _PREV to earlier in this function
 351                  * if rfkill_set_sw_state was invoked.
 352                  */
 353                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 354                         rfkill->state |= RFKILL_BLOCK_SW;
 355                 else
 356                         rfkill->state &= ~RFKILL_BLOCK_SW;
 357         }
 358         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 359         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 360         curr = rfkill->state & RFKILL_BLOCK_SW;
 361         spin_unlock_irqrestore(&rfkill->lock, flags);
 362
 363         rfkill_led_trigger_event(rfkill);
 364         rfkill_global_led_trigger_event();
 365
 366         if (prev != curr)
 367                 rfkill_event(rfkill);
 368 }
 369
 370 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 371 {
 372         int i;
 373
 374         if (type != RFKILL_TYPE_ALL) {
 375                 rfkill_global_states[type].cur = blocked;
 376                 return;
 377         }
 378
 379         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 380                 rfkill_global_states[i].cur = blocked;
 381 }
 382
 383 #ifdef CONFIG_RFKILL_INPUT
 384 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 385
 386 /**
 387  * __rfkill_switch_all - Toggle state of all switches of given type
 388  * @type: type of interfaces to be affected
 389  * @blocked: the new state
 390  *
 391  * This function sets the state of all switches of given type,
 392  * unless a specific switch is suspended.
 393  *
 394  * Caller must have acquired rfkill_global_mutex.
 395  */
 396 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 397 {
 398         struct rfkill *rfkill;
 399
 400         rfkill_update_global_state(type, blocked);
 401         list_for_each_entry(rfkill, &rfkill_list, node) {
 402                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 403                         continue;
 404
 405                 rfkill_set_block(rfkill, blocked);
 406         }
 407 }
 408
 409 /**
 410  * rfkill_switch_all - Toggle state of all switches of given type
 411  * @type: type of interfaces to be affected
 412  * @blocked: the new state
 413  *
 414  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 415  * Please refer to __rfkill_switch_all() for details.
 416  *
 417  * Does nothing if the EPO lock is active.
 418  */
 419 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 420 {
 421         if (atomic_read(&rfkill_input_disabled))
 422                 return;
 423
 424         mutex_lock(&rfkill_global_mutex);
 425
 426         if (!rfkill_epo_lock_active)
 427                 __rfkill_switch_all(type, blocked);
 428
 429         mutex_unlock(&rfkill_global_mutex);
 430 }
 431
 432 /**
 433  * rfkill_epo - emergency power off all transmitters
 434  *
 435  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 436  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 437  *
 438  * The global state before the EPO is saved and can be restored later
 439  * using rfkill_restore_states().
 440  */
 441 void rfkill_epo(void)
 442 {
 443         struct rfkill *rfkill;
 444         int i;
 445
 446         if (atomic_read(&rfkill_input_disabled))
 447                 return;
 448
 449         mutex_lock(&rfkill_global_mutex);
 450
 451         rfkill_epo_lock_active = true;
 452         list_for_each_entry(rfkill, &rfkill_list, node)
 453                 rfkill_set_block(rfkill, true);
 454
 455         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 456                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 457                 rfkill_global_states[i].cur = true;
 458         }
 459
 460         mutex_unlock(&rfkill_global_mutex);
 461 }
 462
 463 /**
 464  * rfkill_restore_states - restore global states
 465  *
 466  * Restore (and sync switches to) the global state from the
 467  * states in rfkill_default_states.  This can undo the effects of
 468  * a call to rfkill_epo().
 469  */
 470 void rfkill_restore_states(void)
 471 {
 472         int i;
 473
 474         if (atomic_read(&rfkill_input_disabled))
 475                 return;
 476
 477         mutex_lock(&rfkill_global_mutex);
 478
 479         rfkill_epo_lock_active = false;
 480         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 481                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 482         mutex_unlock(&rfkill_global_mutex);
 483 }
 484
 485 /**
 486  * rfkill_remove_epo_lock - unlock state changes
 487  *
 488  * Used by rfkill-input manually unlock state changes, when
 489  * the EPO switch is deactivated.
 490  */
 491 void rfkill_remove_epo_lock(void)
 492 {
 493         if (atomic_read(&rfkill_input_disabled))
 494                 return;
 495
 496         mutex_lock(&rfkill_global_mutex);
 497         rfkill_epo_lock_active = false;
 498         mutex_unlock(&rfkill_global_mutex);
 499 }
 500
 501 /**
 502  * rfkill_is_epo_lock_active - returns true EPO is active
 503  *
 504  * Returns 0 (false) if there is NOT an active EPO condition,
 505  * and 1 (true) if there is an active EPO condition, which
 506  * locks all radios in one of the BLOCKED states.
 507  *
 508  * Can be called in atomic context.
 509  */
 510 bool rfkill_is_epo_lock_active(void)
 511 {
 512         return rfkill_epo_lock_active;
 513 }
 514
 515 /**
 516  * rfkill_get_global_sw_state - returns global state for a type
 517  * @type: the type to get the global state of
 518  *
 519  * Returns the current global state for a given wireless
 520  * device type.
 521  */
 522 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 523 {
 524         return rfkill_global_states[type].cur;
 525 }
 526 #endif
 527
 528 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 529                                 bool blocked, unsigned long reason)
 530 {
 531         unsigned long flags;
 532         bool ret, prev;
 533
 534         BUG_ON(!rfkill);
 535
 536         if (WARN(reason &
 537             ~(RFKILL_HARD_BLOCK_SIGNAL | RFKILL_HARD_BLOCK_NOT_OWNER),
 538             "hw_state reason not supported: 0x%lx", reason))
 539                 return blocked;
 540
 541         spin_lock_irqsave(&rfkill->lock, flags);
 542         prev = !!(rfkill->hard_block_reasons & reason);
 543         if (blocked) {
 544                 rfkill->state |= RFKILL_BLOCK_HW;
 545                 rfkill->hard_block_reasons |= reason;
 546         } else {
 547                 rfkill->hard_block_reasons &= ~reason;
 548                 if (!rfkill->hard_block_reasons)
 549                         rfkill->state &= ~RFKILL_BLOCK_HW;
 550         }
 551         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 552         spin_unlock_irqrestore(&rfkill->lock, flags);
 553
 554         rfkill_led_trigger_event(rfkill);
 555         rfkill_global_led_trigger_event();
 556
 557         if (rfkill->registered && prev != blocked)
 558                 schedule_work(&rfkill->uevent_work);
 559
 560         return ret;
 561 }
 562 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
 563
 564 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 565 {
 566         u32 bit = RFKILL_BLOCK_SW;
 567
 568         /* if in a ops->set_block right now, use other bit */
 569         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 570                 bit = RFKILL_BLOCK_SW_PREV;
 571
 572         if (blocked)
 573                 rfkill->state |= bit;
 574         else
 575                 rfkill->state &= ~bit;
 576 }
 577
 578 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 579 {
 580         unsigned long flags;
 581         bool prev, hwblock;
 582
 583         BUG_ON(!rfkill);
 584
 585         spin_lock_irqsave(&rfkill->lock, flags);
 586         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 587         __rfkill_set_sw_state(rfkill, blocked);
 588         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 589         blocked = blocked || hwblock;
 590         spin_unlock_irqrestore(&rfkill->lock, flags);
 591
 592         if (!rfkill->registered)
 593                 return blocked;
 594
 595         if (prev != blocked && !hwblock)
 596                 schedule_work(&rfkill->uevent_work);
 597
 598         rfkill_led_trigger_event(rfkill);
 599         rfkill_global_led_trigger_event();
 600
 601         return blocked;
 602 }
 603 EXPORT_SYMBOL(rfkill_set_sw_state);
 604
 605 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 606 {
 607         unsigned long flags;
 608
 609         BUG_ON(!rfkill);
 610         BUG_ON(rfkill->registered);
 611
 612         spin_lock_irqsave(&rfkill->lock, flags);
 613         __rfkill_set_sw_state(rfkill, blocked);
 614         rfkill->persistent = true;
 615         spin_unlock_irqrestore(&rfkill->lock, flags);
 616 }
 617 EXPORT_SYMBOL(rfkill_init_sw_state);
 618
 619 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 620 {
 621         unsigned long flags;
 622         bool swprev, hwprev;
 623
 624         BUG_ON(!rfkill);
 625
 626         spin_lock_irqsave(&rfkill->lock, flags);
 627
 628         /*
 629          * No need to care about prev/setblock ... this is for uevent only
 630          * and that will get triggered by rfkill_set_block anyway.
 631          */
 632         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 633         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 634         __rfkill_set_sw_state(rfkill, sw);
 635         if (hw)
 636                 rfkill->state |= RFKILL_BLOCK_HW;
 637         else
 638                 rfkill->state &= ~RFKILL_BLOCK_HW;
 639
 640         spin_unlock_irqrestore(&rfkill->lock, flags);
 641
 642         if (!rfkill->registered) {
 643                 rfkill->persistent = true;
 644         } else {
 645                 if (swprev != sw || hwprev != hw)
 646                         schedule_work(&rfkill->uevent_work);
 647
 648                 rfkill_led_trigger_event(rfkill);
 649                 rfkill_global_led_trigger_event();
 650         }
 651 }
 652 EXPORT_SYMBOL(rfkill_set_states);
 653
 654 static const char * const rfkill_types[] = {
 655         NULL, /* RFKILL_TYPE_ALL */
 656         "wlan",
 657         "bluetooth",
 658         "ultrawideband",
 659         "wimax",
 660         "wwan",
 661         "gps",
 662         "fm",
 663         "nfc",
 664 };
 665
 666 enum rfkill_type rfkill_find_type(const char *name)
 667 {
 668         int i;
 669
 670         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 671
 672         if (!name)
 673                 return RFKILL_TYPE_ALL;
 674
 675         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 676                 if (!strcmp(name, rfkill_types[i]))
 677                         return i;
 678         return RFKILL_TYPE_ALL;
 679 }
 680 EXPORT_SYMBOL(rfkill_find_type);
 681
 682 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 683                          char *buf)
 684 {
 685         struct rfkill *rfkill = to_rfkill(dev);
 686
 687         return sprintf(buf, "%s\n", rfkill->name);
 688 }
 689 static DEVICE_ATTR_RO(name);
 690
 691 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 692                          char *buf)
 693 {
 694         struct rfkill *rfkill = to_rfkill(dev);
 695
 696         return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
 697 }
 698 static DEVICE_ATTR_RO(type);
 699
 700 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 701                           char *buf)
 702 {
 703         struct rfkill *rfkill = to_rfkill(dev);
 704
 705         return sprintf(buf, "%d\n", rfkill->idx);
 706 }
 707 static DEVICE_ATTR_RO(index);
 708
 709 static ssize_t persistent_show(struct device *dev,
 710                                struct device_attribute *attr, char *buf)
 711 {
 712         struct rfkill *rfkill = to_rfkill(dev);
 713
 714         return sprintf(buf, "%d\n", rfkill->persistent);
 715 }
 716 static DEVICE_ATTR_RO(persistent);
 717
 718 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 719                          char *buf)
 720 {
 721         struct rfkill *rfkill = to_rfkill(dev);
 722
 723         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 724 }
 725 static DEVICE_ATTR_RO(hard);
 726
 727 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 728                          char *buf)
 729 {
 730         struct rfkill *rfkill = to_rfkill(dev);
 731
 732         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 733 }
 734
 735 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 736                           const char *buf, size_t count)
 737 {
 738         struct rfkill *rfkill = to_rfkill(dev);
 739         unsigned long state;
 740         int err;
 741
 742         if (!capable(CAP_NET_ADMIN))
 743                 return -EPERM;
 744
 745         err = kstrtoul(buf, 0, &state);
 746         if (err)
 747                 return err;
 748
 749         if (state > 1 )
 750                 return -EINVAL;
 751
 752         mutex_lock(&rfkill_global_mutex);
 753         rfkill_set_block(rfkill, state);
 754         mutex_unlock(&rfkill_global_mutex);
 755
 756         return count;
 757 }
 758 static DEVICE_ATTR_RW(soft);
 759
 760 static ssize_t hard_block_reasons_show(struct device *dev,
 761                                        struct device_attribute *attr,
 762                                        char *buf)
 763 {
 764         struct rfkill *rfkill = to_rfkill(dev);
 765
 766         return sprintf(buf, "0x%lx\n", rfkill->hard_block_reasons);
 767 }
 768 static DEVICE_ATTR_RO(hard_block_reasons);
 769
 770 static u8 user_state_from_blocked(unsigned long state)
 771 {
 772         if (state & RFKILL_BLOCK_HW)
 773                 return RFKILL_USER_STATE_HARD_BLOCKED;
 774         if (state & RFKILL_BLOCK_SW)
 775                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 776
 777         return RFKILL_USER_STATE_UNBLOCKED;
 778 }
 779
 780 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 781                           char *buf)
 782 {
 783         struct rfkill *rfkill = to_rfkill(dev);
 784
 785         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 786 }
 787
 788 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 789                            const char *buf, size_t count)
 790 {
 791         struct rfkill *rfkill = to_rfkill(dev);
 792         unsigned long state;
 793         int err;
 794
 795         if (!capable(CAP_NET_ADMIN))
 796                 return -EPERM;
 797
 798         err = kstrtoul(buf, 0, &state);
 799         if (err)
 800                 return err;
 801
 802         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 803             state != RFKILL_USER_STATE_UNBLOCKED)
 804                 return -EINVAL;
 805
 806         mutex_lock(&rfkill_global_mutex);
 807         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 808         mutex_unlock(&rfkill_global_mutex);
 809
 810         return count;
 811 }
 812 static DEVICE_ATTR_RW(state);
 813
 814 static struct attribute *rfkill_dev_attrs[] = {
 815         &dev_attr_name.attr,
 816         &dev_attr_type.attr,
 817         &dev_attr_index.attr,
 818         &dev_attr_persistent.attr,
 819         &dev_attr_state.attr,
 820         &dev_attr_soft.attr,
 821         &dev_attr_hard.attr,
 822         &dev_attr_hard_block_reasons.attr,
 823         NULL,
 824 };
 825 ATTRIBUTE_GROUPS(rfkill_dev);
 826
 827 static void rfkill_release(struct device *dev)
 828 {
 829         struct rfkill *rfkill = to_rfkill(dev);
 830
 831         kfree(rfkill);
 832 }
 833
 834 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 835 {
 836         struct rfkill *rfkill = to_rfkill(dev);
 837         unsigned long flags;
 838         unsigned long reasons;
 839         u32 state;
 840         int error;
 841
 842         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 843         if (error)
 844                 return error;
 845         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 846                                rfkill_types[rfkill->type]);
 847         if (error)
 848                 return error;
 849         spin_lock_irqsave(&rfkill->lock, flags);
 850         state = rfkill->state;
 851         reasons = rfkill->hard_block_reasons;
 852         spin_unlock_irqrestore(&rfkill->lock, flags);
 853         error = add_uevent_var(env, "RFKILL_STATE=%d",
 854                                user_state_from_blocked(state));
 855         if (error)
 856                 return error;
 857         return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
 858 }
 859
 860 void rfkill_pause_polling(struct rfkill *rfkill)
 861 {
 862         BUG_ON(!rfkill);
 863
 864         if (!rfkill->ops->poll)
 865                 return;
 866
 867         rfkill->polling_paused = true;
 868         cancel_delayed_work_sync(&rfkill->poll_work);
 869 }
 870 EXPORT_SYMBOL(rfkill_pause_polling);
 871
 872 void rfkill_resume_polling(struct rfkill *rfkill)
 873 {
 874         BUG_ON(!rfkill);
 875
 876         if (!rfkill->ops->poll)
 877                 return;
 878
 879         rfkill->polling_paused = false;
 880
 881         if (rfkill->suspended)
 882                 return;
 883
 884         queue_delayed_work(system_power_efficient_wq,
 885                            &rfkill->poll_work, 0);
 886 }
 887 EXPORT_SYMBOL(rfkill_resume_polling);
 888
 889 #ifdef CONFIG_PM_SLEEP
 890 static int rfkill_suspend(struct device *dev)
 891 {
 892         struct rfkill *rfkill = to_rfkill(dev);
 893
 894         rfkill->suspended = true;
 895         cancel_delayed_work_sync(&rfkill->poll_work);
 896
 897         return 0;
 898 }
 899
 900 static int rfkill_resume(struct device *dev)
 901 {
 902         struct rfkill *rfkill = to_rfkill(dev);
 903         bool cur;
 904
 905         rfkill->suspended = false;
 906
 907         if (!rfkill->registered)
 908                 return 0;
 909
 910         if (!rfkill->persistent) {
 911                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 912                 rfkill_set_block(rfkill, cur);
 913         }
 914
 915         if (rfkill->ops->poll && !rfkill->polling_paused)
 916                 queue_delayed_work(system_power_efficient_wq,
 917                                    &rfkill->poll_work, 0);
 918
 919         return 0;
 920 }
 921
 922 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 923 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 924 #else
 925 #define RFKILL_PM_OPS NULL
 926 #endif
 927
 928 static struct class rfkill_class = {
 929         .name           = "rfkill",
 930         .dev_release    = rfkill_release,
 931         .dev_groups     = rfkill_dev_groups,
 932         .dev_uevent     = rfkill_dev_uevent,
 933         .pm             = RFKILL_PM_OPS,
 934 };
 935
 936 bool rfkill_blocked(struct rfkill *rfkill)
 937 {
 938         unsigned long flags;
 939         u32 state;
 940
 941         spin_lock_irqsave(&rfkill->lock, flags);
 942         state = rfkill->state;
 943         spin_unlock_irqrestore(&rfkill->lock, flags);
 944
 945         return !!(state & RFKILL_BLOCK_ANY);
 946 }
 947 EXPORT_SYMBOL(rfkill_blocked);
 948
 949 bool rfkill_soft_blocked(struct rfkill *rfkill)
 950 {
 951         unsigned long flags;
 952         u32 state;
 953
 954         spin_lock_irqsave(&rfkill->lock, flags);
 955         state = rfkill->state;
 956         spin_unlock_irqrestore(&rfkill->lock, flags);
 957
 958         return !!(state & RFKILL_BLOCK_SW);
 959 }
 960 EXPORT_SYMBOL(rfkill_soft_blocked);
 961
 962 struct rfkill * __must_check rfkill_alloc(const char *name,
 963                                           struct device *parent,
 964                                           const enum rfkill_type type,
 965                                           const struct rfkill_ops *ops,
 966                                           void *ops_data)
 967 {
 968         struct rfkill *rfkill;
 969         struct device *dev;
 970
 971         if (WARN_ON(!ops))
 972                 return NULL;
 973
 974         if (WARN_ON(!ops->set_block))
 975                 return NULL;
 976
 977         if (WARN_ON(!name))
 978                 return NULL;
 979
 980         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 981                 return NULL;
 982
 983         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 984         if (!rfkill)
 985                 return NULL;
 986
 987         spin_lock_init(&rfkill->lock);
 988         INIT_LIST_HEAD(&rfkill->node);
 989         rfkill->type = type;
 990         strcpy(rfkill->name, name);
 991         rfkill->ops = ops;
 992         rfkill->data = ops_data;
 993
 994         dev = &rfkill->dev;
 995         dev->class = &rfkill_class;
 996         dev->parent = parent;
 997         device_initialize(dev);
 998
 999         return rfkill;
1000 }
1001 EXPORT_SYMBOL(rfkill_alloc);
1002
1003 static void rfkill_poll(struct work_struct *work)
1004 {
1005         struct rfkill *rfkill;
1006
1007         rfkill = container_of(work, struct rfkill, poll_work.work);
1008
1009         /*
1010          * Poll hardware state -- driver will use one of the
1011          * rfkill_set{,_hw,_sw}_state functions and use its
1012          * return value to update the current status.
1013          */
1014         rfkill->ops->poll(rfkill, rfkill->data);
1015
1016         queue_delayed_work(system_power_efficient_wq,
1017                 &rfkill->poll_work,
1018                 round_jiffies_relative(POLL_INTERVAL));
1019 }
1020
1021 static void rfkill_uevent_work(struct work_struct *work)
1022 {
1023         struct rfkill *rfkill;
1024
1025         rfkill = container_of(work, struct rfkill, uevent_work);
1026
1027         mutex_lock(&rfkill_global_mutex);
1028         rfkill_event(rfkill);
1029         mutex_unlock(&rfkill_global_mutex);
1030 }
1031
1032 static void rfkill_sync_work(struct work_struct *work)
1033 {
1034         struct rfkill *rfkill;
1035         bool cur;
1036
1037         rfkill = container_of(work, struct rfkill, sync_work);
1038
1039         mutex_lock(&rfkill_global_mutex);
1040         cur = rfkill_global_states[rfkill->type].cur;
1041         rfkill_set_block(rfkill, cur);
1042         mutex_unlock(&rfkill_global_mutex);
1043 }
1044
1045 int __must_check rfkill_register(struct rfkill *rfkill)
1046 {
1047         static unsigned long rfkill_no;
1048         struct device *dev;
1049         int error;
1050
1051         if (!rfkill)
1052                 return -EINVAL;
1053
1054         dev = &rfkill->dev;
1055
1056         mutex_lock(&rfkill_global_mutex);
1057
1058         if (rfkill->registered) {
1059                 error = -EALREADY;
1060                 goto unlock;
1061         }
1062
1063         rfkill->idx = rfkill_no;
1064         dev_set_name(dev, "rfkill%lu", rfkill_no);
1065         rfkill_no++;
1066
1067         list_add_tail(&rfkill->node, &rfkill_list);
1068
1069         error = device_add(dev);
1070         if (error)
1071                 goto remove;
1072
1073         error = rfkill_led_trigger_register(rfkill);
1074         if (error)
1075                 goto devdel;
1076
1077         rfkill->registered = true;
1078
1079         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1080         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1081         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1082
1083         if (rfkill->ops->poll)
1084                 queue_delayed_work(system_power_efficient_wq,
1085                         &rfkill->poll_work,
1086                         round_jiffies_relative(POLL_INTERVAL));
1087
1088         if (!rfkill->persistent || rfkill_epo_lock_active) {
1089                 schedule_work(&rfkill->sync_work);
1090         } else {
1091 #ifdef CONFIG_RFKILL_INPUT
1092                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1093
1094                 if (!atomic_read(&rfkill_input_disabled))
1095                         __rfkill_switch_all(rfkill->type, soft_blocked);
1096 #endif
1097         }
1098
1099         rfkill_global_led_trigger_event();
1100         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1101
1102         mutex_unlock(&rfkill_global_mutex);
1103         return 0;
1104
1105  devdel:
1106         device_del(&rfkill->dev);
1107  remove:
1108         list_del_init(&rfkill->node);
1109  unlock:
1110         mutex_unlock(&rfkill_global_mutex);
1111         return error;
1112 }
1113 EXPORT_SYMBOL(rfkill_register);
1114
1115 void rfkill_unregister(struct rfkill *rfkill)
1116 {
1117         BUG_ON(!rfkill);
1118
1119         if (rfkill->ops->poll)
1120                 cancel_delayed_work_sync(&rfkill->poll_work);
1121
1122         cancel_work_sync(&rfkill->uevent_work);
1123         cancel_work_sync(&rfkill->sync_work);
1124
1125         rfkill->registered = false;
1126
1127         device_del(&rfkill->dev);
1128
1129         mutex_lock(&rfkill_global_mutex);
1130         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1131         list_del_init(&rfkill->node);
1132         rfkill_global_led_trigger_event();
1133         mutex_unlock(&rfkill_global_mutex);
1134
1135         rfkill_led_trigger_unregister(rfkill);
1136 }
1137 EXPORT_SYMBOL(rfkill_unregister);
1138
1139 void rfkill_destroy(struct rfkill *rfkill)
1140 {
1141         if (rfkill)
1142                 put_device(&rfkill->dev);
1143 }
1144 EXPORT_SYMBOL(rfkill_destroy);
1145
1146 static int rfkill_fop_open(struct inode *inode, struct file *file)
1147 {
1148         struct rfkill_data *data;
1149         struct rfkill *rfkill;
1150         struct rfkill_int_event *ev, *tmp;
1151
1152         data = kzalloc(sizeof(*data), GFP_KERNEL);
1153         if (!data)
1154                 return -ENOMEM;
1155
1156         INIT_LIST_HEAD(&data->events);
1157         mutex_init(&data->mtx);
1158         init_waitqueue_head(&data->read_wait);
1159
1160         mutex_lock(&rfkill_global_mutex);
1161         mutex_lock(&data->mtx);
1162         /*
1163          * start getting events from elsewhere but hold mtx to get
1164          * startup events added first
1165          */
1166
1167         list_for_each_entry(rfkill, &rfkill_list, node) {
1168                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1169                 if (!ev)
1170                         goto free;
1171                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1172                 list_add_tail(&ev->list, &data->events);
1173         }
1174         list_add(&data->list, &rfkill_fds);
1175         mutex_unlock(&data->mtx);
1176         mutex_unlock(&rfkill_global_mutex);
1177
1178         file->private_data = data;
1179
1180         return stream_open(inode, file);
1181
1182  free:
1183         mutex_unlock(&data->mtx);
1184         mutex_unlock(&rfkill_global_mutex);
1185         mutex_destroy(&data->mtx);
1186         list_for_each_entry_safe(ev, tmp, &data->events, list)
1187                 kfree(ev);
1188         kfree(data);
1189         return -ENOMEM;
1190 }
1191
1192 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1193 {
1194         struct rfkill_data *data = file->private_data;
1195         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1196
1197         poll_wait(file, &data->read_wait, wait);
1198
1199         mutex_lock(&data->mtx);
1200         if (!list_empty(&data->events))
1201                 res = EPOLLIN | EPOLLRDNORM;
1202         mutex_unlock(&data->mtx);
1203
1204         return res;
1205 }
1206
1207 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1208                                size_t count, loff_t *pos)
1209 {
1210         struct rfkill_data *data = file->private_data;
1211         struct rfkill_int_event *ev;
1212         unsigned long sz;
1213         int ret;
1214
1215         mutex_lock(&data->mtx);
1216
1217         while (list_empty(&data->events)) {
1218                 if (file->f_flags & O_NONBLOCK) {
1219                         ret = -EAGAIN;
1220                         goto out;
1221                 }
1222                 mutex_unlock(&data->mtx);
1223                 /* since we re-check and it just compares pointers,
1224                  * using !list_empty() without locking isn't a problem
1225                  */
1226                 ret = wait_event_interruptible(data->read_wait,
1227                                                !list_empty(&data->events));
1228                 mutex_lock(&data->mtx);
1229
1230                 if (ret)
1231                         goto out;
1232         }
1233
1234         ev = list_first_entry(&data->events, struct rfkill_int_event,
1235                                 list);
1236
1237         sz = min_t(unsigned long, sizeof(ev->ev), count);
1238         ret = sz;
1239         if (copy_to_user(buf, &ev->ev, sz))
1240                 ret = -EFAULT;
1241
1242         list_del(&ev->list);
1243         kfree(ev);
1244  out:
1245         mutex_unlock(&data->mtx);
1246         return ret;
1247 }
1248
1249 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1250                                 size_t count, loff_t *pos)
1251 {
1252         struct rfkill *rfkill;
1253         struct rfkill_event_ext ev;
1254         int ret;
1255
1256         /* we don't need the 'hard' variable but accept it */
1257         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1258                 return -EINVAL;
1259
1260         /*
1261          * Copy as much data as we can accept into our 'ev' buffer,
1262          * but tell userspace how much we've copied so it can determine
1263          * our API version even in a write() call, if it cares.
1264          */
1265         count = min(count, sizeof(ev));
1266         if (copy_from_user(&ev, buf, count))
1267                 return -EFAULT;
1268
1269         if (ev.type >= NUM_RFKILL_TYPES)
1270                 return -EINVAL;
1271
1272         mutex_lock(&rfkill_global_mutex);
1273
1274         switch (ev.op) {
1275         case RFKILL_OP_CHANGE_ALL:
1276                 rfkill_update_global_state(ev.type, ev.soft);
1277                 list_for_each_entry(rfkill, &rfkill_list, node)
1278                         if (rfkill->type == ev.type ||
1279                             ev.type == RFKILL_TYPE_ALL)
1280                                 rfkill_set_block(rfkill, ev.soft);
1281                 ret = 0;
1282                 break;
1283         case RFKILL_OP_CHANGE:
1284                 list_for_each_entry(rfkill, &rfkill_list, node)
1285                         if (rfkill->idx == ev.idx &&
1286                             (rfkill->type == ev.type ||
1287                              ev.type == RFKILL_TYPE_ALL))
1288                                 rfkill_set_block(rfkill, ev.soft);
1289                 ret = 0;
1290                 break;
1291         default:
1292                 ret = -EINVAL;
1293                 break;
1294         }
1295
1296         mutex_unlock(&rfkill_global_mutex);
1297
1298         return ret ?: count;
1299 }
1300
1301 static int rfkill_fop_release(struct inode *inode, struct file *file)
1302 {
1303         struct rfkill_data *data = file->private_data;
1304         struct rfkill_int_event *ev, *tmp;
1305
1306         mutex_lock(&rfkill_global_mutex);
1307         list_del(&data->list);
1308         mutex_unlock(&rfkill_global_mutex);
1309
1310         mutex_destroy(&data->mtx);
1311         list_for_each_entry_safe(ev, tmp, &data->events, list)
1312                 kfree(ev);
1313
1314 #ifdef CONFIG_RFKILL_INPUT
1315         if (data->input_handler)
1316                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1317                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1318 #endif
1319
1320         kfree(data);
1321
1322         return 0;
1323 }
1324
1325 #ifdef CONFIG_RFKILL_INPUT
1326 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1327                              unsigned long arg)
1328 {
1329         struct rfkill_data *data = file->private_data;
1330
1331         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1332                 return -ENOSYS;
1333
1334         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1335                 return -ENOSYS;
1336
1337         mutex_lock(&data->mtx);
1338
1339         if (!data->input_handler) {
1340                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1341                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1342                 data->input_handler = true;
1343         }
1344
1345         mutex_unlock(&data->mtx);
1346
1347         return 0;
1348 }
1349 #endif
1350
1351 static const struct file_operations rfkill_fops = {
1352         .owner          = THIS_MODULE,
1353         .open           = rfkill_fop_open,
1354         .read           = rfkill_fop_read,
1355         .write          = rfkill_fop_write,
1356         .poll           = rfkill_fop_poll,
1357         .release        = rfkill_fop_release,
1358 #ifdef CONFIG_RFKILL_INPUT
1359         .unlocked_ioctl = rfkill_fop_ioctl,
1360         .compat_ioctl   = compat_ptr_ioctl,
1361 #endif
1362         .llseek         = no_llseek,
1363 };
1364
1365 #define RFKILL_NAME "rfkill"
1366
1367 static struct miscdevice rfkill_miscdev = {
1368         .fops   = &rfkill_fops,
1369         .name   = RFKILL_NAME,
1370         .minor  = RFKILL_MINOR,
1371 };
1372
1373 static int __init rfkill_init(void)
1374 {
1375         int error;
1376
1377         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1378
1379         error = class_register(&rfkill_class);
1380         if (error)
1381                 goto error_class;
1382
1383         error = misc_register(&rfkill_miscdev);
1384         if (error)
1385                 goto error_misc;
1386
1387         error = rfkill_global_led_trigger_register();
1388         if (error)
1389                 goto error_led_trigger;
1390
1391 #ifdef CONFIG_RFKILL_INPUT
1392         error = rfkill_handler_init();
1393         if (error)
1394                 goto error_input;
1395 #endif
1396
1397         return 0;
1398
1399 #ifdef CONFIG_RFKILL_INPUT
1400 error_input:
1401         rfkill_global_led_trigger_unregister();
1402 #endif
1403 error_led_trigger:
1404         misc_deregister(&rfkill_miscdev);
1405 error_misc:
1406         class_unregister(&rfkill_class);
1407 error_class:
1408         return error;
1409 }
1410 subsys_initcall(rfkill_init);
1411
1412 static void __exit rfkill_exit(void)
1413 {
1414 #ifdef CONFIG_RFKILL_INPUT
1415         rfkill_handler_exit();
1416 #endif
1417         rfkill_global_led_trigger_unregister();
1418         misc_deregister(&rfkill_miscdev);
1419         class_unregister(&rfkill_class);
1420 }
1421 module_exit(rfkill_exit);
1422
1423 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1424 MODULE_ALIAS("devname:" RFKILL_NAME);