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         u8                      max_size;
  82 };
  83
  84
  85 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  86 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  87 MODULE_DESCRIPTION("RF switch support");
  88 MODULE_LICENSE("GPL");
  89
  90
  91 /*
  92  * The locking here should be made much smarter, we currently have
  93  * a bit of a stupid situation because drivers might want to register
  94  * the rfkill struct under their own lock, and take this lock during
  95  * rfkill method calls -- which will cause an AB-BA deadlock situation.
  96  *
  97  * To fix that, we need to rework this code here to be mostly lock-free
  98  * and only use the mutex for list manipulations, not to protect the
  99  * various other global variables. Then we can avoid holding the mutex
 100  * around driver operations, and all is happy.
 101  */
 102 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 103 static DEFINE_MUTEX(rfkill_global_mutex);
 104 static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 105
 106 static unsigned int rfkill_default_state = 1;
 107 module_param_named(default_state, rfkill_default_state, uint, 0444);
 108 MODULE_PARM_DESC(default_state,
 109                  "Default initial state for all radio types, 0 = radio off");
 110
 111 static struct {
 112         bool cur, sav;
 113 } rfkill_global_states[NUM_RFKILL_TYPES];
 114
 115 static bool rfkill_epo_lock_active;
 116
 117
 118 #ifdef CONFIG_RFKILL_LEDS
 119 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 120 {
 121         struct led_trigger *trigger;
 122
 123         if (!rfkill->registered)
 124                 return;
 125
 126         trigger = &rfkill->led_trigger;
 127
 128         if (rfkill->state & RFKILL_BLOCK_ANY)
 129                 led_trigger_event(trigger, LED_OFF);
 130         else
 131                 led_trigger_event(trigger, LED_FULL);
 132 }
 133
 134 static int rfkill_led_trigger_activate(struct led_classdev *led)
 135 {
 136         struct rfkill *rfkill;
 137
 138         rfkill = container_of(led->trigger, struct rfkill, led_trigger);
 139
 140         rfkill_led_trigger_event(rfkill);
 141
 142         return 0;
 143 }
 144
 145 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 146 {
 147         return rfkill->led_trigger.name;
 148 }
 149 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 150
 151 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 152 {
 153         BUG_ON(!rfkill);
 154
 155         rfkill->ledtrigname = name;
 156 }
 157 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 158
 159 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 160 {
 161         rfkill->led_trigger.name = rfkill->ledtrigname
 162                                         ? : dev_name(&rfkill->dev);
 163         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 164         return led_trigger_register(&rfkill->led_trigger);
 165 }
 166
 167 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 168 {
 169         led_trigger_unregister(&rfkill->led_trigger);
 170 }
 171
 172 static struct led_trigger rfkill_any_led_trigger;
 173 static struct led_trigger rfkill_none_led_trigger;
 174 static struct work_struct rfkill_global_led_trigger_work;
 175
 176 static void rfkill_global_led_trigger_worker(struct work_struct *work)
 177 {
 178         enum led_brightness brightness = LED_OFF;
 179         struct rfkill *rfkill;
 180
 181         mutex_lock(&rfkill_global_mutex);
 182         list_for_each_entry(rfkill, &rfkill_list, node) {
 183                 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
 184                         brightness = LED_FULL;
 185                         break;
 186                 }
 187         }
 188         mutex_unlock(&rfkill_global_mutex);
 189
 190         led_trigger_event(&rfkill_any_led_trigger, brightness);
 191         led_trigger_event(&rfkill_none_led_trigger,
 192                           brightness == LED_OFF ? LED_FULL : LED_OFF);
 193 }
 194
 195 static void rfkill_global_led_trigger_event(void)
 196 {
 197         schedule_work(&rfkill_global_led_trigger_work);
 198 }
 199
 200 static int rfkill_global_led_trigger_register(void)
 201 {
 202         int ret;
 203
 204         INIT_WORK(&rfkill_global_led_trigger_work,
 205                         rfkill_global_led_trigger_worker);
 206
 207         rfkill_any_led_trigger.name = "rfkill-any";
 208         ret = led_trigger_register(&rfkill_any_led_trigger);
 209         if (ret)
 210                 return ret;
 211
 212         rfkill_none_led_trigger.name = "rfkill-none";
 213         ret = led_trigger_register(&rfkill_none_led_trigger);
 214         if (ret)
 215                 led_trigger_unregister(&rfkill_any_led_trigger);
 216         else
 217                 /* Delay activation until all global triggers are registered */
 218                 rfkill_global_led_trigger_event();
 219
 220         return ret;
 221 }
 222
 223 static void rfkill_global_led_trigger_unregister(void)
 224 {
 225         led_trigger_unregister(&rfkill_none_led_trigger);
 226         led_trigger_unregister(&rfkill_any_led_trigger);
 227         cancel_work_sync(&rfkill_global_led_trigger_work);
 228 }
 229 #else
 230 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 231 {
 232 }
 233
 234 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 235 {
 236         return 0;
 237 }
 238
 239 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 240 {
 241 }
 242
 243 static void rfkill_global_led_trigger_event(void)
 244 {
 245 }
 246
 247 static int rfkill_global_led_trigger_register(void)
 248 {
 249         return 0;
 250 }
 251
 252 static void rfkill_global_led_trigger_unregister(void)
 253 {
 254 }
 255 #endif /* CONFIG_RFKILL_LEDS */
 256
 257 static void rfkill_fill_event(struct rfkill_event_ext *ev,
 258                               struct rfkill *rfkill,
 259                               enum rfkill_operation op)
 260 {
 261         unsigned long flags;
 262
 263         ev->idx = rfkill->idx;
 264         ev->type = rfkill->type;
 265         ev->op = op;
 266
 267         spin_lock_irqsave(&rfkill->lock, flags);
 268         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 269         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 270                                         RFKILL_BLOCK_SW_PREV));
 271         ev->hard_block_reasons = rfkill->hard_block_reasons;
 272         spin_unlock_irqrestore(&rfkill->lock, flags);
 273 }
 274
 275 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 276 {
 277         struct rfkill_data *data;
 278         struct rfkill_int_event *ev;
 279
 280         list_for_each_entry(data, &rfkill_fds, list) {
 281                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 282                 if (!ev)
 283                         continue;
 284                 rfkill_fill_event(&ev->ev, rfkill, op);
 285                 mutex_lock(&data->mtx);
 286                 list_add_tail(&ev->list, &data->events);
 287                 mutex_unlock(&data->mtx);
 288                 wake_up_interruptible(&data->read_wait);
 289         }
 290 }
 291
 292 static void rfkill_event(struct rfkill *rfkill)
 293 {
 294         if (!rfkill->registered)
 295                 return;
 296
 297         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 298
 299         /* also send event to /dev/rfkill */
 300         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 301 }
 302
 303 /**
 304  * rfkill_set_block - wrapper for set_block method
 305  *
 306  * @rfkill: the rfkill struct to use
 307  * @blocked: the new software state
 308  *
 309  * Calls the set_block method (when applicable) and handles notifications
 310  * etc. as well.
 311  */
 312 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 313 {
 314         unsigned long flags;
 315         bool prev, curr;
 316         int err;
 317
 318         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 319                 return;
 320
 321         /*
 322          * Some platforms (...!) generate input events which affect the
 323          * _hard_ kill state -- whenever something tries to change the
 324          * current software state query the hardware state too.
 325          */
 326         if (rfkill->ops->query)
 327                 rfkill->ops->query(rfkill, rfkill->data);
 328
 329         spin_lock_irqsave(&rfkill->lock, flags);
 330         prev = rfkill->state & RFKILL_BLOCK_SW;
 331
 332         if (prev)
 333                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 334         else
 335                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 336
 337         if (blocked)
 338                 rfkill->state |= RFKILL_BLOCK_SW;
 339         else
 340                 rfkill->state &= ~RFKILL_BLOCK_SW;
 341
 342         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 343         spin_unlock_irqrestore(&rfkill->lock, flags);
 344
 345         err = rfkill->ops->set_block(rfkill->data, blocked);
 346
 347         spin_lock_irqsave(&rfkill->lock, flags);
 348         if (err) {
 349                 /*
 350                  * Failed -- reset status to _PREV, which may be different
 351                  * from what we have set _PREV to earlier in this function
 352                  * if rfkill_set_sw_state was invoked.
 353                  */
 354                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 355                         rfkill->state |= RFKILL_BLOCK_SW;
 356                 else
 357                         rfkill->state &= ~RFKILL_BLOCK_SW;
 358         }
 359         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 360         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 361         curr = rfkill->state & RFKILL_BLOCK_SW;
 362         spin_unlock_irqrestore(&rfkill->lock, flags);
 363
 364         rfkill_led_trigger_event(rfkill);
 365         rfkill_global_led_trigger_event();
 366
 367         if (prev != curr)
 368                 rfkill_event(rfkill);
 369 }
 370
 371 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 372 {
 373         int i;
 374
 375         if (type != RFKILL_TYPE_ALL) {
 376                 rfkill_global_states[type].cur = blocked;
 377                 return;
 378         }
 379
 380         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 381                 rfkill_global_states[i].cur = blocked;
 382 }
 383
 384 #ifdef CONFIG_RFKILL_INPUT
 385 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 386
 387 /**
 388  * __rfkill_switch_all - Toggle state of all switches of given type
 389  * @type: type of interfaces to be affected
 390  * @blocked: the new state
 391  *
 392  * This function sets the state of all switches of given type,
 393  * unless a specific switch is suspended.
 394  *
 395  * Caller must have acquired rfkill_global_mutex.
 396  */
 397 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 398 {
 399         struct rfkill *rfkill;
 400
 401         rfkill_update_global_state(type, blocked);
 402         list_for_each_entry(rfkill, &rfkill_list, node) {
 403                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 404                         continue;
 405
 406                 rfkill_set_block(rfkill, blocked);
 407         }
 408 }
 409
 410 /**
 411  * rfkill_switch_all - Toggle state of all switches of given type
 412  * @type: type of interfaces to be affected
 413  * @blocked: the new state
 414  *
 415  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 416  * Please refer to __rfkill_switch_all() for details.
 417  *
 418  * Does nothing if the EPO lock is active.
 419  */
 420 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 421 {
 422         if (atomic_read(&rfkill_input_disabled))
 423                 return;
 424
 425         mutex_lock(&rfkill_global_mutex);
 426
 427         if (!rfkill_epo_lock_active)
 428                 __rfkill_switch_all(type, blocked);
 429
 430         mutex_unlock(&rfkill_global_mutex);
 431 }
 432
 433 /**
 434  * rfkill_epo - emergency power off all transmitters
 435  *
 436  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 437  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 438  *
 439  * The global state before the EPO is saved and can be restored later
 440  * using rfkill_restore_states().
 441  */
 442 void rfkill_epo(void)
 443 {
 444         struct rfkill *rfkill;
 445         int i;
 446
 447         if (atomic_read(&rfkill_input_disabled))
 448                 return;
 449
 450         mutex_lock(&rfkill_global_mutex);
 451
 452         rfkill_epo_lock_active = true;
 453         list_for_each_entry(rfkill, &rfkill_list, node)
 454                 rfkill_set_block(rfkill, true);
 455
 456         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 457                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 458                 rfkill_global_states[i].cur = true;
 459         }
 460
 461         mutex_unlock(&rfkill_global_mutex);
 462 }
 463
 464 /**
 465  * rfkill_restore_states - restore global states
 466  *
 467  * Restore (and sync switches to) the global state from the
 468  * states in rfkill_default_states.  This can undo the effects of
 469  * a call to rfkill_epo().
 470  */
 471 void rfkill_restore_states(void)
 472 {
 473         int i;
 474
 475         if (atomic_read(&rfkill_input_disabled))
 476                 return;
 477
 478         mutex_lock(&rfkill_global_mutex);
 479
 480         rfkill_epo_lock_active = false;
 481         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 482                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 483         mutex_unlock(&rfkill_global_mutex);
 484 }
 485
 486 /**
 487  * rfkill_remove_epo_lock - unlock state changes
 488  *
 489  * Used by rfkill-input manually unlock state changes, when
 490  * the EPO switch is deactivated.
 491  */
 492 void rfkill_remove_epo_lock(void)
 493 {
 494         if (atomic_read(&rfkill_input_disabled))
 495                 return;
 496
 497         mutex_lock(&rfkill_global_mutex);
 498         rfkill_epo_lock_active = false;
 499         mutex_unlock(&rfkill_global_mutex);
 500 }
 501
 502 /**
 503  * rfkill_is_epo_lock_active - returns true EPO is active
 504  *
 505  * Returns 0 (false) if there is NOT an active EPO condition,
 506  * and 1 (true) if there is an active EPO condition, which
 507  * locks all radios in one of the BLOCKED states.
 508  *
 509  * Can be called in atomic context.
 510  */
 511 bool rfkill_is_epo_lock_active(void)
 512 {
 513         return rfkill_epo_lock_active;
 514 }
 515
 516 /**
 517  * rfkill_get_global_sw_state - returns global state for a type
 518  * @type: the type to get the global state of
 519  *
 520  * Returns the current global state for a given wireless
 521  * device type.
 522  */
 523 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 524 {
 525         return rfkill_global_states[type].cur;
 526 }
 527 #endif
 528
 529 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 530                                 bool blocked, unsigned long reason)
 531 {
 532         unsigned long flags;
 533         bool ret, prev;
 534
 535         BUG_ON(!rfkill);
 536
 537         if (WARN(reason &
 538             ~(RFKILL_HARD_BLOCK_SIGNAL | RFKILL_HARD_BLOCK_NOT_OWNER),
 539             "hw_state reason not supported: 0x%lx", reason))
 540                 return blocked;
 541
 542         spin_lock_irqsave(&rfkill->lock, flags);
 543         prev = !!(rfkill->hard_block_reasons & reason);
 544         if (blocked) {
 545                 rfkill->state |= RFKILL_BLOCK_HW;
 546                 rfkill->hard_block_reasons |= reason;
 547         } else {
 548                 rfkill->hard_block_reasons &= ~reason;
 549                 if (!rfkill->hard_block_reasons)
 550                         rfkill->state &= ~RFKILL_BLOCK_HW;
 551         }
 552         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 553         spin_unlock_irqrestore(&rfkill->lock, flags);
 554
 555         rfkill_led_trigger_event(rfkill);
 556         rfkill_global_led_trigger_event();
 557
 558         if (rfkill->registered && prev != blocked)
 559                 schedule_work(&rfkill->uevent_work);
 560
 561         return ret;
 562 }
 563 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
 564
 565 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 566 {
 567         u32 bit = RFKILL_BLOCK_SW;
 568
 569         /* if in a ops->set_block right now, use other bit */
 570         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 571                 bit = RFKILL_BLOCK_SW_PREV;
 572
 573         if (blocked)
 574                 rfkill->state |= bit;
 575         else
 576                 rfkill->state &= ~bit;
 577 }
 578
 579 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 580 {
 581         unsigned long flags;
 582         bool prev, hwblock;
 583
 584         BUG_ON(!rfkill);
 585
 586         spin_lock_irqsave(&rfkill->lock, flags);
 587         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 588         __rfkill_set_sw_state(rfkill, blocked);
 589         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 590         blocked = blocked || hwblock;
 591         spin_unlock_irqrestore(&rfkill->lock, flags);
 592
 593         if (!rfkill->registered)
 594                 return blocked;
 595
 596         if (prev != blocked && !hwblock)
 597                 schedule_work(&rfkill->uevent_work);
 598
 599         rfkill_led_trigger_event(rfkill);
 600         rfkill_global_led_trigger_event();
 601
 602         return blocked;
 603 }
 604 EXPORT_SYMBOL(rfkill_set_sw_state);
 605
 606 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 607 {
 608         unsigned long flags;
 609
 610         BUG_ON(!rfkill);
 611         BUG_ON(rfkill->registered);
 612
 613         spin_lock_irqsave(&rfkill->lock, flags);
 614         __rfkill_set_sw_state(rfkill, blocked);
 615         rfkill->persistent = true;
 616         spin_unlock_irqrestore(&rfkill->lock, flags);
 617 }
 618 EXPORT_SYMBOL(rfkill_init_sw_state);
 619
 620 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 621 {
 622         unsigned long flags;
 623         bool swprev, hwprev;
 624
 625         BUG_ON(!rfkill);
 626
 627         spin_lock_irqsave(&rfkill->lock, flags);
 628
 629         /*
 630          * No need to care about prev/setblock ... this is for uevent only
 631          * and that will get triggered by rfkill_set_block anyway.
 632          */
 633         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 634         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 635         __rfkill_set_sw_state(rfkill, sw);
 636         if (hw)
 637                 rfkill->state |= RFKILL_BLOCK_HW;
 638         else
 639                 rfkill->state &= ~RFKILL_BLOCK_HW;
 640
 641         spin_unlock_irqrestore(&rfkill->lock, flags);
 642
 643         if (!rfkill->registered) {
 644                 rfkill->persistent = true;
 645         } else {
 646                 if (swprev != sw || hwprev != hw)
 647                         schedule_work(&rfkill->uevent_work);
 648
 649                 rfkill_led_trigger_event(rfkill);
 650                 rfkill_global_led_trigger_event();
 651         }
 652 }
 653 EXPORT_SYMBOL(rfkill_set_states);
 654
 655 static const char * const rfkill_types[] = {
 656         NULL, /* RFKILL_TYPE_ALL */
 657         "wlan",
 658         "bluetooth",
 659         "ultrawideband",
 660         "wimax",
 661         "wwan",
 662         "gps",
 663         "fm",
 664         "nfc",
 665 };
 666
 667 enum rfkill_type rfkill_find_type(const char *name)
 668 {
 669         int i;
 670
 671         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 672
 673         if (!name)
 674                 return RFKILL_TYPE_ALL;
 675
 676         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 677                 if (!strcmp(name, rfkill_types[i]))
 678                         return i;
 679         return RFKILL_TYPE_ALL;
 680 }
 681 EXPORT_SYMBOL(rfkill_find_type);
 682
 683 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 684                          char *buf)
 685 {
 686         struct rfkill *rfkill = to_rfkill(dev);
 687
 688         return sprintf(buf, "%s\n", rfkill->name);
 689 }
 690 static DEVICE_ATTR_RO(name);
 691
 692 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 693                          char *buf)
 694 {
 695         struct rfkill *rfkill = to_rfkill(dev);
 696
 697         return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
 698 }
 699 static DEVICE_ATTR_RO(type);
 700
 701 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 702                           char *buf)
 703 {
 704         struct rfkill *rfkill = to_rfkill(dev);
 705
 706         return sprintf(buf, "%d\n", rfkill->idx);
 707 }
 708 static DEVICE_ATTR_RO(index);
 709
 710 static ssize_t persistent_show(struct device *dev,
 711                                struct device_attribute *attr, char *buf)
 712 {
 713         struct rfkill *rfkill = to_rfkill(dev);
 714
 715         return sprintf(buf, "%d\n", rfkill->persistent);
 716 }
 717 static DEVICE_ATTR_RO(persistent);
 718
 719 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 720                          char *buf)
 721 {
 722         struct rfkill *rfkill = to_rfkill(dev);
 723
 724         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 725 }
 726 static DEVICE_ATTR_RO(hard);
 727
 728 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 729                          char *buf)
 730 {
 731         struct rfkill *rfkill = to_rfkill(dev);
 732
 733         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 734 }
 735
 736 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 737                           const char *buf, size_t count)
 738 {
 739         struct rfkill *rfkill = to_rfkill(dev);
 740         unsigned long state;
 741         int err;
 742
 743         if (!capable(CAP_NET_ADMIN))
 744                 return -EPERM;
 745
 746         err = kstrtoul(buf, 0, &state);
 747         if (err)
 748                 return err;
 749
 750         if (state > 1 )
 751                 return -EINVAL;
 752
 753         mutex_lock(&rfkill_global_mutex);
 754         rfkill_set_block(rfkill, state);
 755         mutex_unlock(&rfkill_global_mutex);
 756
 757         return count;
 758 }
 759 static DEVICE_ATTR_RW(soft);
 760
 761 static ssize_t hard_block_reasons_show(struct device *dev,
 762                                        struct device_attribute *attr,
 763                                        char *buf)
 764 {
 765         struct rfkill *rfkill = to_rfkill(dev);
 766
 767         return sprintf(buf, "0x%lx\n", rfkill->hard_block_reasons);
 768 }
 769 static DEVICE_ATTR_RO(hard_block_reasons);
 770
 771 static u8 user_state_from_blocked(unsigned long state)
 772 {
 773         if (state & RFKILL_BLOCK_HW)
 774                 return RFKILL_USER_STATE_HARD_BLOCKED;
 775         if (state & RFKILL_BLOCK_SW)
 776                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 777
 778         return RFKILL_USER_STATE_UNBLOCKED;
 779 }
 780
 781 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 782                           char *buf)
 783 {
 784         struct rfkill *rfkill = to_rfkill(dev);
 785
 786         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 787 }
 788
 789 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 790                            const char *buf, size_t count)
 791 {
 792         struct rfkill *rfkill = to_rfkill(dev);
 793         unsigned long state;
 794         int err;
 795
 796         if (!capable(CAP_NET_ADMIN))
 797                 return -EPERM;
 798
 799         err = kstrtoul(buf, 0, &state);
 800         if (err)
 801                 return err;
 802
 803         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 804             state != RFKILL_USER_STATE_UNBLOCKED)
 805                 return -EINVAL;
 806
 807         mutex_lock(&rfkill_global_mutex);
 808         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 809         mutex_unlock(&rfkill_global_mutex);
 810
 811         return count;
 812 }
 813 static DEVICE_ATTR_RW(state);
 814
 815 static struct attribute *rfkill_dev_attrs[] = {
 816         &dev_attr_name.attr,
 817         &dev_attr_type.attr,
 818         &dev_attr_index.attr,
 819         &dev_attr_persistent.attr,
 820         &dev_attr_state.attr,
 821         &dev_attr_soft.attr,
 822         &dev_attr_hard.attr,
 823         &dev_attr_hard_block_reasons.attr,
 824         NULL,
 825 };
 826 ATTRIBUTE_GROUPS(rfkill_dev);
 827
 828 static void rfkill_release(struct device *dev)
 829 {
 830         struct rfkill *rfkill = to_rfkill(dev);
 831
 832         kfree(rfkill);
 833 }
 834
 835 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 836 {
 837         struct rfkill *rfkill = to_rfkill(dev);
 838         unsigned long flags;
 839         unsigned long reasons;
 840         u32 state;
 841         int error;
 842
 843         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 844         if (error)
 845                 return error;
 846         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 847                                rfkill_types[rfkill->type]);
 848         if (error)
 849                 return error;
 850         spin_lock_irqsave(&rfkill->lock, flags);
 851         state = rfkill->state;
 852         reasons = rfkill->hard_block_reasons;
 853         spin_unlock_irqrestore(&rfkill->lock, flags);
 854         error = add_uevent_var(env, "RFKILL_STATE=%d",
 855                                user_state_from_blocked(state));
 856         if (error)
 857                 return error;
 858         return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
 859 }
 860
 861 void rfkill_pause_polling(struct rfkill *rfkill)
 862 {
 863         BUG_ON(!rfkill);
 864
 865         if (!rfkill->ops->poll)
 866                 return;
 867
 868         rfkill->polling_paused = true;
 869         cancel_delayed_work_sync(&rfkill->poll_work);
 870 }
 871 EXPORT_SYMBOL(rfkill_pause_polling);
 872
 873 void rfkill_resume_polling(struct rfkill *rfkill)
 874 {
 875         BUG_ON(!rfkill);
 876
 877         if (!rfkill->ops->poll)
 878                 return;
 879
 880         rfkill->polling_paused = false;
 881
 882         if (rfkill->suspended)
 883                 return;
 884
 885         queue_delayed_work(system_power_efficient_wq,
 886                            &rfkill->poll_work, 0);
 887 }
 888 EXPORT_SYMBOL(rfkill_resume_polling);
 889
 890 #ifdef CONFIG_PM_SLEEP
 891 static int rfkill_suspend(struct device *dev)
 892 {
 893         struct rfkill *rfkill = to_rfkill(dev);
 894
 895         rfkill->suspended = true;
 896         cancel_delayed_work_sync(&rfkill->poll_work);
 897
 898         return 0;
 899 }
 900
 901 static int rfkill_resume(struct device *dev)
 902 {
 903         struct rfkill *rfkill = to_rfkill(dev);
 904         bool cur;
 905
 906         rfkill->suspended = false;
 907
 908         if (!rfkill->registered)
 909                 return 0;
 910
 911         if (!rfkill->persistent) {
 912                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 913                 rfkill_set_block(rfkill, cur);
 914         }
 915
 916         if (rfkill->ops->poll && !rfkill->polling_paused)
 917                 queue_delayed_work(system_power_efficient_wq,
 918                                    &rfkill->poll_work, 0);
 919
 920         return 0;
 921 }
 922
 923 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 924 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 925 #else
 926 #define RFKILL_PM_OPS NULL
 927 #endif
 928
 929 static struct class rfkill_class = {
 930         .name           = "rfkill",
 931         .dev_release    = rfkill_release,
 932         .dev_groups     = rfkill_dev_groups,
 933         .dev_uevent     = rfkill_dev_uevent,
 934         .pm             = RFKILL_PM_OPS,
 935 };
 936
 937 bool rfkill_blocked(struct rfkill *rfkill)
 938 {
 939         unsigned long flags;
 940         u32 state;
 941
 942         spin_lock_irqsave(&rfkill->lock, flags);
 943         state = rfkill->state;
 944         spin_unlock_irqrestore(&rfkill->lock, flags);
 945
 946         return !!(state & RFKILL_BLOCK_ANY);
 947 }
 948 EXPORT_SYMBOL(rfkill_blocked);
 949
 950
 951 struct rfkill * __must_check rfkill_alloc(const char *name,
 952                                           struct device *parent,
 953                                           const enum rfkill_type type,
 954                                           const struct rfkill_ops *ops,
 955                                           void *ops_data)
 956 {
 957         struct rfkill *rfkill;
 958         struct device *dev;
 959
 960         if (WARN_ON(!ops))
 961                 return NULL;
 962
 963         if (WARN_ON(!ops->set_block))
 964                 return NULL;
 965
 966         if (WARN_ON(!name))
 967                 return NULL;
 968
 969         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 970                 return NULL;
 971
 972         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 973         if (!rfkill)
 974                 return NULL;
 975
 976         spin_lock_init(&rfkill->lock);
 977         INIT_LIST_HEAD(&rfkill->node);
 978         rfkill->type = type;
 979         strcpy(rfkill->name, name);
 980         rfkill->ops = ops;
 981         rfkill->data = ops_data;
 982
 983         dev = &rfkill->dev;
 984         dev->class = &rfkill_class;
 985         dev->parent = parent;
 986         device_initialize(dev);
 987
 988         return rfkill;
 989 }
 990 EXPORT_SYMBOL(rfkill_alloc);
 991
 992 static void rfkill_poll(struct work_struct *work)
 993 {
 994         struct rfkill *rfkill;
 995
 996         rfkill = container_of(work, struct rfkill, poll_work.work);
 997
 998         /*
 999          * Poll hardware state -- driver will use one of the
1000          * rfkill_set{,_hw,_sw}_state functions and use its
1001          * return value to update the current status.
1002          */
1003         rfkill->ops->poll(rfkill, rfkill->data);
1004
1005         queue_delayed_work(system_power_efficient_wq,
1006                 &rfkill->poll_work,
1007                 round_jiffies_relative(POLL_INTERVAL));
1008 }
1009
1010 static void rfkill_uevent_work(struct work_struct *work)
1011 {
1012         struct rfkill *rfkill;
1013
1014         rfkill = container_of(work, struct rfkill, uevent_work);
1015
1016         mutex_lock(&rfkill_global_mutex);
1017         rfkill_event(rfkill);
1018         mutex_unlock(&rfkill_global_mutex);
1019 }
1020
1021 static void rfkill_sync_work(struct work_struct *work)
1022 {
1023         struct rfkill *rfkill;
1024         bool cur;
1025
1026         rfkill = container_of(work, struct rfkill, sync_work);
1027
1028         mutex_lock(&rfkill_global_mutex);
1029         cur = rfkill_global_states[rfkill->type].cur;
1030         rfkill_set_block(rfkill, cur);
1031         mutex_unlock(&rfkill_global_mutex);
1032 }
1033
1034 int __must_check rfkill_register(struct rfkill *rfkill)
1035 {
1036         static unsigned long rfkill_no;
1037         struct device *dev;
1038         int error;
1039
1040         if (!rfkill)
1041                 return -EINVAL;
1042
1043         dev = &rfkill->dev;
1044
1045         mutex_lock(&rfkill_global_mutex);
1046
1047         if (rfkill->registered) {
1048                 error = -EALREADY;
1049                 goto unlock;
1050         }
1051
1052         rfkill->idx = rfkill_no;
1053         dev_set_name(dev, "rfkill%lu", rfkill_no);
1054         rfkill_no++;
1055
1056         list_add_tail(&rfkill->node, &rfkill_list);
1057
1058         error = device_add(dev);
1059         if (error)
1060                 goto remove;
1061
1062         error = rfkill_led_trigger_register(rfkill);
1063         if (error)
1064                 goto devdel;
1065
1066         rfkill->registered = true;
1067
1068         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1069         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1070         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1071
1072         if (rfkill->ops->poll)
1073                 queue_delayed_work(system_power_efficient_wq,
1074                         &rfkill->poll_work,
1075                         round_jiffies_relative(POLL_INTERVAL));
1076
1077         if (!rfkill->persistent || rfkill_epo_lock_active) {
1078                 schedule_work(&rfkill->sync_work);
1079         } else {
1080 #ifdef CONFIG_RFKILL_INPUT
1081                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1082
1083                 if (!atomic_read(&rfkill_input_disabled))
1084                         __rfkill_switch_all(rfkill->type, soft_blocked);
1085 #endif
1086         }
1087
1088         rfkill_global_led_trigger_event();
1089         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1090
1091         mutex_unlock(&rfkill_global_mutex);
1092         return 0;
1093
1094  devdel:
1095         device_del(&rfkill->dev);
1096  remove:
1097         list_del_init(&rfkill->node);
1098  unlock:
1099         mutex_unlock(&rfkill_global_mutex);
1100         return error;
1101 }
1102 EXPORT_SYMBOL(rfkill_register);
1103
1104 void rfkill_unregister(struct rfkill *rfkill)
1105 {
1106         BUG_ON(!rfkill);
1107
1108         if (rfkill->ops->poll)
1109                 cancel_delayed_work_sync(&rfkill->poll_work);
1110
1111         cancel_work_sync(&rfkill->uevent_work);
1112         cancel_work_sync(&rfkill->sync_work);
1113
1114         rfkill->registered = false;
1115
1116         device_del(&rfkill->dev);
1117
1118         mutex_lock(&rfkill_global_mutex);
1119         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1120         list_del_init(&rfkill->node);
1121         rfkill_global_led_trigger_event();
1122         mutex_unlock(&rfkill_global_mutex);
1123
1124         rfkill_led_trigger_unregister(rfkill);
1125 }
1126 EXPORT_SYMBOL(rfkill_unregister);
1127
1128 void rfkill_destroy(struct rfkill *rfkill)
1129 {
1130         if (rfkill)
1131                 put_device(&rfkill->dev);
1132 }
1133 EXPORT_SYMBOL(rfkill_destroy);
1134
1135 static int rfkill_fop_open(struct inode *inode, struct file *file)
1136 {
1137         struct rfkill_data *data;
1138         struct rfkill *rfkill;
1139         struct rfkill_int_event *ev, *tmp;
1140
1141         data = kzalloc(sizeof(*data), GFP_KERNEL);
1142         if (!data)
1143                 return -ENOMEM;
1144
1145         data->max_size = RFKILL_EVENT_SIZE_V1;
1146
1147         INIT_LIST_HEAD(&data->events);
1148         mutex_init(&data->mtx);
1149         init_waitqueue_head(&data->read_wait);
1150
1151         mutex_lock(&rfkill_global_mutex);
1152         mutex_lock(&data->mtx);
1153         /*
1154          * start getting events from elsewhere but hold mtx to get
1155          * startup events added first
1156          */
1157
1158         list_for_each_entry(rfkill, &rfkill_list, node) {
1159                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1160                 if (!ev)
1161                         goto free;
1162                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1163                 list_add_tail(&ev->list, &data->events);
1164         }
1165         list_add(&data->list, &rfkill_fds);
1166         mutex_unlock(&data->mtx);
1167         mutex_unlock(&rfkill_global_mutex);
1168
1169         file->private_data = data;
1170
1171         return stream_open(inode, file);
1172
1173  free:
1174         mutex_unlock(&data->mtx);
1175         mutex_unlock(&rfkill_global_mutex);
1176         mutex_destroy(&data->mtx);
1177         list_for_each_entry_safe(ev, tmp, &data->events, list)
1178                 kfree(ev);
1179         kfree(data);
1180         return -ENOMEM;
1181 }
1182
1183 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1184 {
1185         struct rfkill_data *data = file->private_data;
1186         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1187
1188         poll_wait(file, &data->read_wait, wait);
1189
1190         mutex_lock(&data->mtx);
1191         if (!list_empty(&data->events))
1192                 res = EPOLLIN | EPOLLRDNORM;
1193         mutex_unlock(&data->mtx);
1194
1195         return res;
1196 }
1197
1198 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1199                                size_t count, loff_t *pos)
1200 {
1201         struct rfkill_data *data = file->private_data;
1202         struct rfkill_int_event *ev;
1203         unsigned long sz;
1204         int ret;
1205
1206         mutex_lock(&data->mtx);
1207
1208         while (list_empty(&data->events)) {
1209                 if (file->f_flags & O_NONBLOCK) {
1210                         ret = -EAGAIN;
1211                         goto out;
1212                 }
1213                 mutex_unlock(&data->mtx);
1214                 /* since we re-check and it just compares pointers,
1215                  * using !list_empty() without locking isn't a problem
1216                  */
1217                 ret = wait_event_interruptible(data->read_wait,
1218                                                !list_empty(&data->events));
1219                 mutex_lock(&data->mtx);
1220
1221                 if (ret)
1222                         goto out;
1223         }
1224
1225         ev = list_first_entry(&data->events, struct rfkill_int_event,
1226                                 list);
1227
1228         sz = min_t(unsigned long, sizeof(ev->ev), count);
1229         sz = min_t(unsigned long, sz, data->max_size);
1230         ret = sz;
1231         if (copy_to_user(buf, &ev->ev, sz))
1232                 ret = -EFAULT;
1233
1234         list_del(&ev->list);
1235         kfree(ev);
1236  out:
1237         mutex_unlock(&data->mtx);
1238         return ret;
1239 }
1240
1241 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1242                                 size_t count, loff_t *pos)
1243 {
1244         struct rfkill_data *data = file->private_data;
1245         struct rfkill *rfkill;
1246         struct rfkill_event_ext ev;
1247         int ret;
1248
1249         /* we don't need the 'hard' variable but accept it */
1250         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1251                 return -EINVAL;
1252
1253         /*
1254          * Copy as much data as we can accept into our 'ev' buffer,
1255          * but tell userspace how much we've copied so it can determine
1256          * our API version even in a write() call, if it cares.
1257          */
1258         count = min(count, sizeof(ev));
1259         count = min_t(size_t, count, data->max_size);
1260         if (copy_from_user(&ev, buf, count))
1261                 return -EFAULT;
1262
1263         if (ev.type >= NUM_RFKILL_TYPES)
1264                 return -EINVAL;
1265
1266         mutex_lock(&rfkill_global_mutex);
1267
1268         switch (ev.op) {
1269         case RFKILL_OP_CHANGE_ALL:
1270                 rfkill_update_global_state(ev.type, ev.soft);
1271                 list_for_each_entry(rfkill, &rfkill_list, node)
1272                         if (rfkill->type == ev.type ||
1273                             ev.type == RFKILL_TYPE_ALL)
1274                                 rfkill_set_block(rfkill, ev.soft);
1275                 ret = 0;
1276                 break;
1277         case RFKILL_OP_CHANGE:
1278                 list_for_each_entry(rfkill, &rfkill_list, node)
1279                         if (rfkill->idx == ev.idx &&
1280                             (rfkill->type == ev.type ||
1281                              ev.type == RFKILL_TYPE_ALL))
1282                                 rfkill_set_block(rfkill, ev.soft);
1283                 ret = 0;
1284                 break;
1285         default:
1286                 ret = -EINVAL;
1287                 break;
1288         }
1289
1290         mutex_unlock(&rfkill_global_mutex);
1291
1292         return ret ?: count;
1293 }
1294
1295 static int rfkill_fop_release(struct inode *inode, struct file *file)
1296 {
1297         struct rfkill_data *data = file->private_data;
1298         struct rfkill_int_event *ev, *tmp;
1299
1300         mutex_lock(&rfkill_global_mutex);
1301         list_del(&data->list);
1302         mutex_unlock(&rfkill_global_mutex);
1303
1304         mutex_destroy(&data->mtx);
1305         list_for_each_entry_safe(ev, tmp, &data->events, list)
1306                 kfree(ev);
1307
1308 #ifdef CONFIG_RFKILL_INPUT
1309         if (data->input_handler)
1310                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1311                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1312 #endif
1313
1314         kfree(data);
1315
1316         return 0;
1317 }
1318
1319 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1320                              unsigned long arg)
1321 {
1322         struct rfkill_data *data = file->private_data;
1323         int ret = -ENOSYS;
1324         u32 size;
1325
1326         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1327                 return -ENOSYS;
1328
1329         mutex_lock(&data->mtx);
1330         switch (_IOC_NR(cmd)) {
1331 #ifdef CONFIG_RFKILL_INPUT
1332         case RFKILL_IOC_NOINPUT:
1333                 if (!data->input_handler) {
1334                         if (atomic_inc_return(&rfkill_input_disabled) == 1)
1335                                 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1336                         data->input_handler = true;
1337                 }
1338                 ret = 0;
1339                 break;
1340 #endif
1341         case RFKILL_IOC_MAX_SIZE:
1342                 if (get_user(size, (__u32 __user *)arg)) {
1343                         ret = -EFAULT;
1344                         break;
1345                 }
1346                 if (size < RFKILL_EVENT_SIZE_V1 || size > U8_MAX) {
1347                         ret = -EINVAL;
1348                         break;
1349                 }
1350                 data->max_size = size;
1351                 ret = 0;
1352                 break;
1353         default:
1354                 break;
1355         }
1356         mutex_unlock(&data->mtx);
1357
1358         return ret;
1359 }
1360
1361 static const struct file_operations rfkill_fops = {
1362         .owner          = THIS_MODULE,
1363         .open           = rfkill_fop_open,
1364         .read           = rfkill_fop_read,
1365         .write          = rfkill_fop_write,
1366         .poll           = rfkill_fop_poll,
1367         .release        = rfkill_fop_release,
1368         .unlocked_ioctl = rfkill_fop_ioctl,
1369         .compat_ioctl   = compat_ptr_ioctl,
1370         .llseek         = no_llseek,
1371 };
1372
1373 #define RFKILL_NAME "rfkill"
1374
1375 static struct miscdevice rfkill_miscdev = {
1376         .fops   = &rfkill_fops,
1377         .name   = RFKILL_NAME,
1378         .minor  = RFKILL_MINOR,
1379 };
1380
1381 static int __init rfkill_init(void)
1382 {
1383         int error;
1384
1385         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1386
1387         error = class_register(&rfkill_class);
1388         if (error)
1389                 goto error_class;
1390
1391         error = misc_register(&rfkill_miscdev);
1392         if (error)
1393                 goto error_misc;
1394
1395         error = rfkill_global_led_trigger_register();
1396         if (error)
1397                 goto error_led_trigger;
1398
1399 #ifdef CONFIG_RFKILL_INPUT
1400         error = rfkill_handler_init();
1401         if (error)
1402                 goto error_input;
1403 #endif
1404
1405         return 0;
1406
1407 #ifdef CONFIG_RFKILL_INPUT
1408 error_input:
1409         rfkill_global_led_trigger_unregister();
1410 #endif
1411 error_led_trigger:
1412         misc_deregister(&rfkill_miscdev);
1413 error_misc:
1414         class_unregister(&rfkill_class);
1415 error_class:
1416         return error;
1417 }
1418 subsys_initcall(rfkill_init);
1419
1420 static void __exit rfkill_exit(void)
1421 {
1422 #ifdef CONFIG_RFKILL_INPUT
1423         rfkill_handler_exit();
1424 #endif
1425         rfkill_global_led_trigger_unregister();
1426         misc_deregister(&rfkill_miscdev);
1427         class_unregister(&rfkill_class);
1428 }
1429 module_exit(rfkill_exit);
1430
1431 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1432 MODULE_ALIAS("devname:" RFKILL_NAME);