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         bool                    need_sync;
  52
  53         const struct rfkill_ops *ops;
  54         void                    *data;
  55
  56 #ifdef CONFIG_RFKILL_LEDS
  57         struct led_trigger      led_trigger;
  58         const char              *ledtrigname;
  59 #endif
  60
  61         struct device           dev;
  62         struct list_head        node;
  63
  64         struct delayed_work     poll_work;
  65         struct work_struct      uevent_work;
  66         struct work_struct      sync_work;
  67         char                    name[];
  68 };
  69 #define to_rfkill(d)    container_of(d, struct rfkill, dev)
  70
  71 struct rfkill_int_event {
  72         struct list_head        list;
  73         struct rfkill_event_ext ev;
  74 };
  75
  76 struct rfkill_data {
  77         struct list_head        list;
  78         struct list_head        events;
  79         struct mutex            mtx;
  80         wait_queue_head_t       read_wait;
  81         bool                    input_handler;
  82         u8                      max_size;
  83 };
  84
  85
  86 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  87 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  88 MODULE_DESCRIPTION("RF switch support");
  89 MODULE_LICENSE("GPL");
  90
  91
  92 /*
  93  * The locking here should be made much smarter, we currently have
  94  * a bit of a stupid situation because drivers might want to register
  95  * the rfkill struct under their own lock, and take this lock during
  96  * rfkill method calls -- which will cause an AB-BA deadlock situation.
  97  *
  98  * To fix that, we need to rework this code here to be mostly lock-free
  99  * and only use the mutex for list manipulations, not to protect the
 100  * various other global variables. Then we can avoid holding the mutex
 101  * around driver operations, and all is happy.
 102  */
 103 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 104 static DEFINE_MUTEX(rfkill_global_mutex);
 105 static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 106
 107 static unsigned int rfkill_default_state = 1;
 108 module_param_named(default_state, rfkill_default_state, uint, 0444);
 109 MODULE_PARM_DESC(default_state,
 110                  "Default initial state for all radio types, 0 = radio off");
 111
 112 static struct {
 113         bool cur, sav;
 114 } rfkill_global_states[NUM_RFKILL_TYPES];
 115
 116 static bool rfkill_epo_lock_active;
 117
 118
 119 #ifdef CONFIG_RFKILL_LEDS
 120 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 121 {
 122         struct led_trigger *trigger;
 123
 124         if (!rfkill->registered)
 125                 return;
 126
 127         trigger = &rfkill->led_trigger;
 128
 129         if (rfkill->state & RFKILL_BLOCK_ANY)
 130                 led_trigger_event(trigger, LED_OFF);
 131         else
 132                 led_trigger_event(trigger, LED_FULL);
 133 }
 134
 135 static int rfkill_led_trigger_activate(struct led_classdev *led)
 136 {
 137         struct rfkill *rfkill;
 138
 139         rfkill = container_of(led->trigger, struct rfkill, led_trigger);
 140
 141         rfkill_led_trigger_event(rfkill);
 142
 143         return 0;
 144 }
 145
 146 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 147 {
 148         return rfkill->led_trigger.name;
 149 }
 150 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 151
 152 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 153 {
 154         BUG_ON(!rfkill);
 155
 156         rfkill->ledtrigname = name;
 157 }
 158 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 159
 160 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 161 {
 162         rfkill->led_trigger.name = rfkill->ledtrigname
 163                                         ? : dev_name(&rfkill->dev);
 164         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 165         return led_trigger_register(&rfkill->led_trigger);
 166 }
 167
 168 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 169 {
 170         led_trigger_unregister(&rfkill->led_trigger);
 171 }
 172
 173 static struct led_trigger rfkill_any_led_trigger;
 174 static struct led_trigger rfkill_none_led_trigger;
 175 static struct work_struct rfkill_global_led_trigger_work;
 176
 177 static void rfkill_global_led_trigger_worker(struct work_struct *work)
 178 {
 179         enum led_brightness brightness = LED_OFF;
 180         struct rfkill *rfkill;
 181
 182         mutex_lock(&rfkill_global_mutex);
 183         list_for_each_entry(rfkill, &rfkill_list, node) {
 184                 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
 185                         brightness = LED_FULL;
 186                         break;
 187                 }
 188         }
 189         mutex_unlock(&rfkill_global_mutex);
 190
 191         led_trigger_event(&rfkill_any_led_trigger, brightness);
 192         led_trigger_event(&rfkill_none_led_trigger,
 193                           brightness == LED_OFF ? LED_FULL : LED_OFF);
 194 }
 195
 196 static void rfkill_global_led_trigger_event(void)
 197 {
 198         schedule_work(&rfkill_global_led_trigger_work);
 199 }
 200
 201 static int rfkill_global_led_trigger_register(void)
 202 {
 203         int ret;
 204
 205         INIT_WORK(&rfkill_global_led_trigger_work,
 206                         rfkill_global_led_trigger_worker);
 207
 208         rfkill_any_led_trigger.name = "rfkill-any";
 209         ret = led_trigger_register(&rfkill_any_led_trigger);
 210         if (ret)
 211                 return ret;
 212
 213         rfkill_none_led_trigger.name = "rfkill-none";
 214         ret = led_trigger_register(&rfkill_none_led_trigger);
 215         if (ret)
 216                 led_trigger_unregister(&rfkill_any_led_trigger);
 217         else
 218                 /* Delay activation until all global triggers are registered */
 219                 rfkill_global_led_trigger_event();
 220
 221         return ret;
 222 }
 223
 224 static void rfkill_global_led_trigger_unregister(void)
 225 {
 226         led_trigger_unregister(&rfkill_none_led_trigger);
 227         led_trigger_unregister(&rfkill_any_led_trigger);
 228         cancel_work_sync(&rfkill_global_led_trigger_work);
 229 }
 230 #else
 231 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 232 {
 233 }
 234
 235 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 236 {
 237         return 0;
 238 }
 239
 240 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 241 {
 242 }
 243
 244 static void rfkill_global_led_trigger_event(void)
 245 {
 246 }
 247
 248 static int rfkill_global_led_trigger_register(void)
 249 {
 250         return 0;
 251 }
 252
 253 static void rfkill_global_led_trigger_unregister(void)
 254 {
 255 }
 256 #endif /* CONFIG_RFKILL_LEDS */
 257
 258 static void rfkill_fill_event(struct rfkill_event_ext *ev,
 259                               struct rfkill *rfkill,
 260                               enum rfkill_operation op)
 261 {
 262         unsigned long flags;
 263
 264         ev->idx = rfkill->idx;
 265         ev->type = rfkill->type;
 266         ev->op = op;
 267
 268         spin_lock_irqsave(&rfkill->lock, flags);
 269         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 270         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 271                                         RFKILL_BLOCK_SW_PREV));
 272         ev->hard_block_reasons = rfkill->hard_block_reasons;
 273         spin_unlock_irqrestore(&rfkill->lock, flags);
 274 }
 275
 276 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 277 {
 278         struct rfkill_data *data;
 279         struct rfkill_int_event *ev;
 280
 281         list_for_each_entry(data, &rfkill_fds, list) {
 282                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 283                 if (!ev)
 284                         continue;
 285                 rfkill_fill_event(&ev->ev, rfkill, op);
 286                 mutex_lock(&data->mtx);
 287                 list_add_tail(&ev->list, &data->events);
 288                 mutex_unlock(&data->mtx);
 289                 wake_up_interruptible(&data->read_wait);
 290         }
 291 }
 292
 293 static void rfkill_event(struct rfkill *rfkill)
 294 {
 295         if (!rfkill->registered)
 296                 return;
 297
 298         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 299
 300         /* also send event to /dev/rfkill */
 301         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 302 }
 303
 304 /**
 305  * rfkill_set_block - wrapper for set_block method
 306  *
 307  * @rfkill: the rfkill struct to use
 308  * @blocked: the new software state
 309  *
 310  * Calls the set_block method (when applicable) and handles notifications
 311  * etc. as well.
 312  */
 313 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 314 {
 315         unsigned long flags;
 316         bool prev, curr;
 317         int err;
 318
 319         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 320                 return;
 321
 322         /*
 323          * Some platforms (...!) generate input events which affect the
 324          * _hard_ kill state -- whenever something tries to change the
 325          * current software state query the hardware state too.
 326          */
 327         if (rfkill->ops->query)
 328                 rfkill->ops->query(rfkill, rfkill->data);
 329
 330         spin_lock_irqsave(&rfkill->lock, flags);
 331         prev = rfkill->state & RFKILL_BLOCK_SW;
 332
 333         if (prev)
 334                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 335         else
 336                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 337
 338         if (blocked)
 339                 rfkill->state |= RFKILL_BLOCK_SW;
 340         else
 341                 rfkill->state &= ~RFKILL_BLOCK_SW;
 342
 343         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 344         spin_unlock_irqrestore(&rfkill->lock, flags);
 345
 346         err = rfkill->ops->set_block(rfkill->data, blocked);
 347
 348         spin_lock_irqsave(&rfkill->lock, flags);
 349         if (err) {
 350                 /*
 351                  * Failed -- reset status to _PREV, which may be different
 352                  * from what we have set _PREV to earlier in this function
 353                  * if rfkill_set_sw_state was invoked.
 354                  */
 355                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 356                         rfkill->state |= RFKILL_BLOCK_SW;
 357                 else
 358                         rfkill->state &= ~RFKILL_BLOCK_SW;
 359         }
 360         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 361         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 362         curr = rfkill->state & RFKILL_BLOCK_SW;
 363         spin_unlock_irqrestore(&rfkill->lock, flags);
 364
 365         rfkill_led_trigger_event(rfkill);
 366         rfkill_global_led_trigger_event();
 367
 368         if (prev != curr)
 369                 rfkill_event(rfkill);
 370 }
 371
 372 static void rfkill_sync(struct rfkill *rfkill)
 373 {
 374         lockdep_assert_held(&rfkill_global_mutex);
 375
 376         if (!rfkill->need_sync)
 377                 return;
 378
 379         rfkill_set_block(rfkill, rfkill_global_states[rfkill->type].cur);
 380         rfkill->need_sync = false;
 381 }
 382
 383 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 384 {
 385         int i;
 386
 387         if (type != RFKILL_TYPE_ALL) {
 388                 rfkill_global_states[type].cur = blocked;
 389                 return;
 390         }
 391
 392         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 393                 rfkill_global_states[i].cur = blocked;
 394 }
 395
 396 #ifdef CONFIG_RFKILL_INPUT
 397 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 398
 399 /**
 400  * __rfkill_switch_all - Toggle state of all switches of given type
 401  * @type: type of interfaces to be affected
 402  * @blocked: the new state
 403  *
 404  * This function sets the state of all switches of given type,
 405  * unless a specific switch is suspended.
 406  *
 407  * Caller must have acquired rfkill_global_mutex.
 408  */
 409 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 410 {
 411         struct rfkill *rfkill;
 412
 413         rfkill_update_global_state(type, blocked);
 414         list_for_each_entry(rfkill, &rfkill_list, node) {
 415                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 416                         continue;
 417
 418                 rfkill_set_block(rfkill, blocked);
 419         }
 420 }
 421
 422 /**
 423  * rfkill_switch_all - Toggle state of all switches of given type
 424  * @type: type of interfaces to be affected
 425  * @blocked: the new state
 426  *
 427  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 428  * Please refer to __rfkill_switch_all() for details.
 429  *
 430  * Does nothing if the EPO lock is active.
 431  */
 432 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 433 {
 434         if (atomic_read(&rfkill_input_disabled))
 435                 return;
 436
 437         mutex_lock(&rfkill_global_mutex);
 438
 439         if (!rfkill_epo_lock_active)
 440                 __rfkill_switch_all(type, blocked);
 441
 442         mutex_unlock(&rfkill_global_mutex);
 443 }
 444
 445 /**
 446  * rfkill_epo - emergency power off all transmitters
 447  *
 448  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 449  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 450  *
 451  * The global state before the EPO is saved and can be restored later
 452  * using rfkill_restore_states().
 453  */
 454 void rfkill_epo(void)
 455 {
 456         struct rfkill *rfkill;
 457         int i;
 458
 459         if (atomic_read(&rfkill_input_disabled))
 460                 return;
 461
 462         mutex_lock(&rfkill_global_mutex);
 463
 464         rfkill_epo_lock_active = true;
 465         list_for_each_entry(rfkill, &rfkill_list, node)
 466                 rfkill_set_block(rfkill, true);
 467
 468         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 469                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 470                 rfkill_global_states[i].cur = true;
 471         }
 472
 473         mutex_unlock(&rfkill_global_mutex);
 474 }
 475
 476 /**
 477  * rfkill_restore_states - restore global states
 478  *
 479  * Restore (and sync switches to) the global state from the
 480  * states in rfkill_default_states.  This can undo the effects of
 481  * a call to rfkill_epo().
 482  */
 483 void rfkill_restore_states(void)
 484 {
 485         int i;
 486
 487         if (atomic_read(&rfkill_input_disabled))
 488                 return;
 489
 490         mutex_lock(&rfkill_global_mutex);
 491
 492         rfkill_epo_lock_active = false;
 493         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 494                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 495         mutex_unlock(&rfkill_global_mutex);
 496 }
 497
 498 /**
 499  * rfkill_remove_epo_lock - unlock state changes
 500  *
 501  * Used by rfkill-input manually unlock state changes, when
 502  * the EPO switch is deactivated.
 503  */
 504 void rfkill_remove_epo_lock(void)
 505 {
 506         if (atomic_read(&rfkill_input_disabled))
 507                 return;
 508
 509         mutex_lock(&rfkill_global_mutex);
 510         rfkill_epo_lock_active = false;
 511         mutex_unlock(&rfkill_global_mutex);
 512 }
 513
 514 /**
 515  * rfkill_is_epo_lock_active - returns true EPO is active
 516  *
 517  * Returns 0 (false) if there is NOT an active EPO condition,
 518  * and 1 (true) if there is an active EPO condition, which
 519  * locks all radios in one of the BLOCKED states.
 520  *
 521  * Can be called in atomic context.
 522  */
 523 bool rfkill_is_epo_lock_active(void)
 524 {
 525         return rfkill_epo_lock_active;
 526 }
 527
 528 /**
 529  * rfkill_get_global_sw_state - returns global state for a type
 530  * @type: the type to get the global state of
 531  *
 532  * Returns the current global state for a given wireless
 533  * device type.
 534  */
 535 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 536 {
 537         return rfkill_global_states[type].cur;
 538 }
 539 #endif
 540
 541 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 542                                 bool blocked,
 543                                 enum rfkill_hard_block_reasons reason)
 544 {
 545         unsigned long flags;
 546         bool ret, prev;
 547
 548         BUG_ON(!rfkill);
 549
 550         spin_lock_irqsave(&rfkill->lock, flags);
 551         prev = !!(rfkill->hard_block_reasons & reason);
 552         if (blocked) {
 553                 rfkill->state |= RFKILL_BLOCK_HW;
 554                 rfkill->hard_block_reasons |= reason;
 555         } else {
 556                 rfkill->hard_block_reasons &= ~reason;
 557                 if (!rfkill->hard_block_reasons)
 558                         rfkill->state &= ~RFKILL_BLOCK_HW;
 559         }
 560         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 561         spin_unlock_irqrestore(&rfkill->lock, flags);
 562
 563         rfkill_led_trigger_event(rfkill);
 564         rfkill_global_led_trigger_event();
 565
 566         if (rfkill->registered && prev != blocked)
 567                 schedule_work(&rfkill->uevent_work);
 568
 569         return ret;
 570 }
 571 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
 572
 573 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 574 {
 575         u32 bit = RFKILL_BLOCK_SW;
 576
 577         /* if in a ops->set_block right now, use other bit */
 578         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 579                 bit = RFKILL_BLOCK_SW_PREV;
 580
 581         if (blocked)
 582                 rfkill->state |= bit;
 583         else
 584                 rfkill->state &= ~bit;
 585 }
 586
 587 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 588 {
 589         unsigned long flags;
 590         bool prev, hwblock;
 591
 592         BUG_ON(!rfkill);
 593
 594         spin_lock_irqsave(&rfkill->lock, flags);
 595         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 596         __rfkill_set_sw_state(rfkill, blocked);
 597         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 598         blocked = blocked || hwblock;
 599         spin_unlock_irqrestore(&rfkill->lock, flags);
 600
 601         if (!rfkill->registered)
 602                 return blocked;
 603
 604         if (prev != blocked && !hwblock)
 605                 schedule_work(&rfkill->uevent_work);
 606
 607         rfkill_led_trigger_event(rfkill);
 608         rfkill_global_led_trigger_event();
 609
 610         return blocked;
 611 }
 612 EXPORT_SYMBOL(rfkill_set_sw_state);
 613
 614 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 615 {
 616         unsigned long flags;
 617
 618         BUG_ON(!rfkill);
 619         BUG_ON(rfkill->registered);
 620
 621         spin_lock_irqsave(&rfkill->lock, flags);
 622         __rfkill_set_sw_state(rfkill, blocked);
 623         rfkill->persistent = true;
 624         spin_unlock_irqrestore(&rfkill->lock, flags);
 625 }
 626 EXPORT_SYMBOL(rfkill_init_sw_state);
 627
 628 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 629 {
 630         unsigned long flags;
 631         bool swprev, hwprev;
 632
 633         BUG_ON(!rfkill);
 634
 635         spin_lock_irqsave(&rfkill->lock, flags);
 636
 637         /*
 638          * No need to care about prev/setblock ... this is for uevent only
 639          * and that will get triggered by rfkill_set_block anyway.
 640          */
 641         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 642         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 643         __rfkill_set_sw_state(rfkill, sw);
 644         if (hw)
 645                 rfkill->state |= RFKILL_BLOCK_HW;
 646         else
 647                 rfkill->state &= ~RFKILL_BLOCK_HW;
 648
 649         spin_unlock_irqrestore(&rfkill->lock, flags);
 650
 651         if (!rfkill->registered) {
 652                 rfkill->persistent = true;
 653         } else {
 654                 if (swprev != sw || hwprev != hw)
 655                         schedule_work(&rfkill->uevent_work);
 656
 657                 rfkill_led_trigger_event(rfkill);
 658                 rfkill_global_led_trigger_event();
 659         }
 660 }
 661 EXPORT_SYMBOL(rfkill_set_states);
 662
 663 static const char * const rfkill_types[] = {
 664         NULL, /* RFKILL_TYPE_ALL */
 665         "wlan",
 666         "bluetooth",
 667         "ultrawideband",
 668         "wimax",
 669         "wwan",
 670         "gps",
 671         "fm",
 672         "nfc",
 673 };
 674
 675 enum rfkill_type rfkill_find_type(const char *name)
 676 {
 677         int i;
 678
 679         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 680
 681         if (!name)
 682                 return RFKILL_TYPE_ALL;
 683
 684         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 685                 if (!strcmp(name, rfkill_types[i]))
 686                         return i;
 687         return RFKILL_TYPE_ALL;
 688 }
 689 EXPORT_SYMBOL(rfkill_find_type);
 690
 691 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 692                          char *buf)
 693 {
 694         struct rfkill *rfkill = to_rfkill(dev);
 695
 696         return sysfs_emit(buf, "%s\n", rfkill->name);
 697 }
 698 static DEVICE_ATTR_RO(name);
 699
 700 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 701                          char *buf)
 702 {
 703         struct rfkill *rfkill = to_rfkill(dev);
 704
 705         return sysfs_emit(buf, "%s\n", rfkill_types[rfkill->type]);
 706 }
 707 static DEVICE_ATTR_RO(type);
 708
 709 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 710                           char *buf)
 711 {
 712         struct rfkill *rfkill = to_rfkill(dev);
 713
 714         return sysfs_emit(buf, "%d\n", rfkill->idx);
 715 }
 716 static DEVICE_ATTR_RO(index);
 717
 718 static ssize_t persistent_show(struct device *dev,
 719                                struct device_attribute *attr, char *buf)
 720 {
 721         struct rfkill *rfkill = to_rfkill(dev);
 722
 723         return sysfs_emit(buf, "%d\n", rfkill->persistent);
 724 }
 725 static DEVICE_ATTR_RO(persistent);
 726
 727 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 728                          char *buf)
 729 {
 730         struct rfkill *rfkill = to_rfkill(dev);
 731
 732         return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0);
 733 }
 734 static DEVICE_ATTR_RO(hard);
 735
 736 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 737                          char *buf)
 738 {
 739         struct rfkill *rfkill = to_rfkill(dev);
 740
 741         mutex_lock(&rfkill_global_mutex);
 742         rfkill_sync(rfkill);
 743         mutex_unlock(&rfkill_global_mutex);
 744
 745         return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0);
 746 }
 747
 748 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 749                           const char *buf, size_t count)
 750 {
 751         struct rfkill *rfkill = to_rfkill(dev);
 752         unsigned long state;
 753         int err;
 754
 755         if (!capable(CAP_NET_ADMIN))
 756                 return -EPERM;
 757
 758         err = kstrtoul(buf, 0, &state);
 759         if (err)
 760                 return err;
 761
 762         if (state > 1 )
 763                 return -EINVAL;
 764
 765         mutex_lock(&rfkill_global_mutex);
 766         rfkill_sync(rfkill);
 767         rfkill_set_block(rfkill, state);
 768         mutex_unlock(&rfkill_global_mutex);
 769
 770         return count;
 771 }
 772 static DEVICE_ATTR_RW(soft);
 773
 774 static ssize_t hard_block_reasons_show(struct device *dev,
 775                                        struct device_attribute *attr,
 776                                        char *buf)
 777 {
 778         struct rfkill *rfkill = to_rfkill(dev);
 779
 780         return sysfs_emit(buf, "0x%lx\n", rfkill->hard_block_reasons);
 781 }
 782 static DEVICE_ATTR_RO(hard_block_reasons);
 783
 784 static u8 user_state_from_blocked(unsigned long state)
 785 {
 786         if (state & RFKILL_BLOCK_HW)
 787                 return RFKILL_USER_STATE_HARD_BLOCKED;
 788         if (state & RFKILL_BLOCK_SW)
 789                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 790
 791         return RFKILL_USER_STATE_UNBLOCKED;
 792 }
 793
 794 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 795                           char *buf)
 796 {
 797         struct rfkill *rfkill = to_rfkill(dev);
 798
 799         mutex_lock(&rfkill_global_mutex);
 800         rfkill_sync(rfkill);
 801         mutex_unlock(&rfkill_global_mutex);
 802
 803         return sysfs_emit(buf, "%d\n", user_state_from_blocked(rfkill->state));
 804 }
 805
 806 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 807                            const char *buf, size_t count)
 808 {
 809         struct rfkill *rfkill = to_rfkill(dev);
 810         unsigned long state;
 811         int err;
 812
 813         if (!capable(CAP_NET_ADMIN))
 814                 return -EPERM;
 815
 816         err = kstrtoul(buf, 0, &state);
 817         if (err)
 818                 return err;
 819
 820         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 821             state != RFKILL_USER_STATE_UNBLOCKED)
 822                 return -EINVAL;
 823
 824         mutex_lock(&rfkill_global_mutex);
 825         rfkill_sync(rfkill);
 826         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 827         mutex_unlock(&rfkill_global_mutex);
 828
 829         return count;
 830 }
 831 static DEVICE_ATTR_RW(state);
 832
 833 static struct attribute *rfkill_dev_attrs[] = {
 834         &dev_attr_name.attr,
 835         &dev_attr_type.attr,
 836         &dev_attr_index.attr,
 837         &dev_attr_persistent.attr,
 838         &dev_attr_state.attr,
 839         &dev_attr_soft.attr,
 840         &dev_attr_hard.attr,
 841         &dev_attr_hard_block_reasons.attr,
 842         NULL,
 843 };
 844 ATTRIBUTE_GROUPS(rfkill_dev);
 845
 846 static void rfkill_release(struct device *dev)
 847 {
 848         struct rfkill *rfkill = to_rfkill(dev);
 849
 850         kfree(rfkill);
 851 }
 852
 853 static int rfkill_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 854 {
 855         struct rfkill *rfkill = to_rfkill(dev);
 856         unsigned long flags;
 857         unsigned long reasons;
 858         u32 state;
 859         int error;
 860
 861         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 862         if (error)
 863                 return error;
 864         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 865                                rfkill_types[rfkill->type]);
 866         if (error)
 867                 return error;
 868         spin_lock_irqsave(&rfkill->lock, flags);
 869         state = rfkill->state;
 870         reasons = rfkill->hard_block_reasons;
 871         spin_unlock_irqrestore(&rfkill->lock, flags);
 872         error = add_uevent_var(env, "RFKILL_STATE=%d",
 873                                user_state_from_blocked(state));
 874         if (error)
 875                 return error;
 876         return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
 877 }
 878
 879 void rfkill_pause_polling(struct rfkill *rfkill)
 880 {
 881         BUG_ON(!rfkill);
 882
 883         if (!rfkill->ops->poll)
 884                 return;
 885
 886         rfkill->polling_paused = true;
 887         cancel_delayed_work_sync(&rfkill->poll_work);
 888 }
 889 EXPORT_SYMBOL(rfkill_pause_polling);
 890
 891 void rfkill_resume_polling(struct rfkill *rfkill)
 892 {
 893         BUG_ON(!rfkill);
 894
 895         if (!rfkill->ops->poll)
 896                 return;
 897
 898         rfkill->polling_paused = false;
 899
 900         if (rfkill->suspended)
 901                 return;
 902
 903         queue_delayed_work(system_power_efficient_wq,
 904                            &rfkill->poll_work, 0);
 905 }
 906 EXPORT_SYMBOL(rfkill_resume_polling);
 907
 908 #ifdef CONFIG_PM_SLEEP
 909 static int rfkill_suspend(struct device *dev)
 910 {
 911         struct rfkill *rfkill = to_rfkill(dev);
 912
 913         rfkill->suspended = true;
 914         cancel_delayed_work_sync(&rfkill->poll_work);
 915
 916         return 0;
 917 }
 918
 919 static int rfkill_resume(struct device *dev)
 920 {
 921         struct rfkill *rfkill = to_rfkill(dev);
 922         bool cur;
 923
 924         rfkill->suspended = false;
 925
 926         if (!rfkill->registered)
 927                 return 0;
 928
 929         if (!rfkill->persistent) {
 930                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 931                 rfkill_set_block(rfkill, cur);
 932         }
 933
 934         if (rfkill->ops->poll && !rfkill->polling_paused)
 935                 queue_delayed_work(system_power_efficient_wq,
 936                                    &rfkill->poll_work, 0);
 937
 938         return 0;
 939 }
 940
 941 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 942 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 943 #else
 944 #define RFKILL_PM_OPS NULL
 945 #endif
 946
 947 static struct class rfkill_class = {
 948         .name           = "rfkill",
 949         .dev_release    = rfkill_release,
 950         .dev_groups     = rfkill_dev_groups,
 951         .dev_uevent     = rfkill_dev_uevent,
 952         .pm             = RFKILL_PM_OPS,
 953 };
 954
 955 bool rfkill_blocked(struct rfkill *rfkill)
 956 {
 957         unsigned long flags;
 958         u32 state;
 959
 960         spin_lock_irqsave(&rfkill->lock, flags);
 961         state = rfkill->state;
 962         spin_unlock_irqrestore(&rfkill->lock, flags);
 963
 964         return !!(state & RFKILL_BLOCK_ANY);
 965 }
 966 EXPORT_SYMBOL(rfkill_blocked);
 967
 968 bool rfkill_soft_blocked(struct rfkill *rfkill)
 969 {
 970         unsigned long flags;
 971         u32 state;
 972
 973         spin_lock_irqsave(&rfkill->lock, flags);
 974         state = rfkill->state;
 975         spin_unlock_irqrestore(&rfkill->lock, flags);
 976
 977         return !!(state & RFKILL_BLOCK_SW);
 978 }
 979 EXPORT_SYMBOL(rfkill_soft_blocked);
 980
 981 struct rfkill * __must_check rfkill_alloc(const char *name,
 982                                           struct device *parent,
 983                                           const enum rfkill_type type,
 984                                           const struct rfkill_ops *ops,
 985                                           void *ops_data)
 986 {
 987         struct rfkill *rfkill;
 988         struct device *dev;
 989
 990         if (WARN_ON(!ops))
 991                 return NULL;
 992
 993         if (WARN_ON(!ops->set_block))
 994                 return NULL;
 995
 996         if (WARN_ON(!name))
 997                 return NULL;
 998
 999         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
1000                 return NULL;
1001
1002         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
1003         if (!rfkill)
1004                 return NULL;
1005
1006         spin_lock_init(&rfkill->lock);
1007         INIT_LIST_HEAD(&rfkill->node);
1008         rfkill->type = type;
1009         strcpy(rfkill->name, name);
1010         rfkill->ops = ops;
1011         rfkill->data = ops_data;
1012
1013         dev = &rfkill->dev;
1014         dev->class = &rfkill_class;
1015         dev->parent = parent;
1016         device_initialize(dev);
1017
1018         return rfkill;
1019 }
1020 EXPORT_SYMBOL(rfkill_alloc);
1021
1022 static void rfkill_poll(struct work_struct *work)
1023 {
1024         struct rfkill *rfkill;
1025
1026         rfkill = container_of(work, struct rfkill, poll_work.work);
1027
1028         /*
1029          * Poll hardware state -- driver will use one of the
1030          * rfkill_set{,_hw,_sw}_state functions and use its
1031          * return value to update the current status.
1032          */
1033         rfkill->ops->poll(rfkill, rfkill->data);
1034
1035         queue_delayed_work(system_power_efficient_wq,
1036                 &rfkill->poll_work,
1037                 round_jiffies_relative(POLL_INTERVAL));
1038 }
1039
1040 static void rfkill_uevent_work(struct work_struct *work)
1041 {
1042         struct rfkill *rfkill;
1043
1044         rfkill = container_of(work, struct rfkill, uevent_work);
1045
1046         mutex_lock(&rfkill_global_mutex);
1047         rfkill_event(rfkill);
1048         mutex_unlock(&rfkill_global_mutex);
1049 }
1050
1051 static void rfkill_sync_work(struct work_struct *work)
1052 {
1053         struct rfkill *rfkill = container_of(work, struct rfkill, sync_work);
1054
1055         mutex_lock(&rfkill_global_mutex);
1056         rfkill_sync(rfkill);
1057         mutex_unlock(&rfkill_global_mutex);
1058 }
1059
1060 int __must_check rfkill_register(struct rfkill *rfkill)
1061 {
1062         static unsigned long rfkill_no;
1063         struct device *dev;
1064         int error;
1065
1066         if (!rfkill)
1067                 return -EINVAL;
1068
1069         dev = &rfkill->dev;
1070
1071         mutex_lock(&rfkill_global_mutex);
1072
1073         if (rfkill->registered) {
1074                 error = -EALREADY;
1075                 goto unlock;
1076         }
1077
1078         rfkill->idx = rfkill_no;
1079         dev_set_name(dev, "rfkill%lu", rfkill_no);
1080         rfkill_no++;
1081
1082         list_add_tail(&rfkill->node, &rfkill_list);
1083
1084         error = device_add(dev);
1085         if (error)
1086                 goto remove;
1087
1088         error = rfkill_led_trigger_register(rfkill);
1089         if (error)
1090                 goto devdel;
1091
1092         rfkill->registered = true;
1093
1094         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1095         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1096         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1097
1098         if (rfkill->ops->poll)
1099                 queue_delayed_work(system_power_efficient_wq,
1100                         &rfkill->poll_work,
1101                         round_jiffies_relative(POLL_INTERVAL));
1102
1103         if (!rfkill->persistent || rfkill_epo_lock_active) {
1104                 rfkill->need_sync = true;
1105                 schedule_work(&rfkill->sync_work);
1106         } else {
1107 #ifdef CONFIG_RFKILL_INPUT
1108                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1109
1110                 if (!atomic_read(&rfkill_input_disabled))
1111                         __rfkill_switch_all(rfkill->type, soft_blocked);
1112 #endif
1113         }
1114
1115         rfkill_global_led_trigger_event();
1116         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1117
1118         mutex_unlock(&rfkill_global_mutex);
1119         return 0;
1120
1121  devdel:
1122         device_del(&rfkill->dev);
1123  remove:
1124         list_del_init(&rfkill->node);
1125  unlock:
1126         mutex_unlock(&rfkill_global_mutex);
1127         return error;
1128 }
1129 EXPORT_SYMBOL(rfkill_register);
1130
1131 void rfkill_unregister(struct rfkill *rfkill)
1132 {
1133         BUG_ON(!rfkill);
1134
1135         if (rfkill->ops->poll)
1136                 cancel_delayed_work_sync(&rfkill->poll_work);
1137
1138         cancel_work_sync(&rfkill->uevent_work);
1139         cancel_work_sync(&rfkill->sync_work);
1140
1141         rfkill->registered = false;
1142
1143         device_del(&rfkill->dev);
1144
1145         mutex_lock(&rfkill_global_mutex);
1146         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1147         list_del_init(&rfkill->node);
1148         rfkill_global_led_trigger_event();
1149         mutex_unlock(&rfkill_global_mutex);
1150
1151         rfkill_led_trigger_unregister(rfkill);
1152 }
1153 EXPORT_SYMBOL(rfkill_unregister);
1154
1155 void rfkill_destroy(struct rfkill *rfkill)
1156 {
1157         if (rfkill)
1158                 put_device(&rfkill->dev);
1159 }
1160 EXPORT_SYMBOL(rfkill_destroy);
1161
1162 static int rfkill_fop_open(struct inode *inode, struct file *file)
1163 {
1164         struct rfkill_data *data;
1165         struct rfkill *rfkill;
1166         struct rfkill_int_event *ev, *tmp;
1167
1168         data = kzalloc(sizeof(*data), GFP_KERNEL);
1169         if (!data)
1170                 return -ENOMEM;
1171
1172         data->max_size = RFKILL_EVENT_SIZE_V1;
1173
1174         INIT_LIST_HEAD(&data->events);
1175         mutex_init(&data->mtx);
1176         init_waitqueue_head(&data->read_wait);
1177
1178         mutex_lock(&rfkill_global_mutex);
1179         /*
1180          * start getting events from elsewhere but hold mtx to get
1181          * startup events added first
1182          */
1183
1184         list_for_each_entry(rfkill, &rfkill_list, node) {
1185                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1186                 if (!ev)
1187                         goto free;
1188                 rfkill_sync(rfkill);
1189                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1190                 mutex_lock(&data->mtx);
1191                 list_add_tail(&ev->list, &data->events);
1192                 mutex_unlock(&data->mtx);
1193         }
1194         list_add(&data->list, &rfkill_fds);
1195         mutex_unlock(&rfkill_global_mutex);
1196
1197         file->private_data = data;
1198
1199         return stream_open(inode, file);
1200
1201  free:
1202         mutex_unlock(&rfkill_global_mutex);
1203         mutex_destroy(&data->mtx);
1204         list_for_each_entry_safe(ev, tmp, &data->events, list)
1205                 kfree(ev);
1206         kfree(data);
1207         return -ENOMEM;
1208 }
1209
1210 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1211 {
1212         struct rfkill_data *data = file->private_data;
1213         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1214
1215         poll_wait(file, &data->read_wait, wait);
1216
1217         mutex_lock(&data->mtx);
1218         if (!list_empty(&data->events))
1219                 res = EPOLLIN | EPOLLRDNORM;
1220         mutex_unlock(&data->mtx);
1221
1222         return res;
1223 }
1224
1225 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1226                                size_t count, loff_t *pos)
1227 {
1228         struct rfkill_data *data = file->private_data;
1229         struct rfkill_int_event *ev;
1230         unsigned long sz;
1231         int ret;
1232
1233         mutex_lock(&data->mtx);
1234
1235         while (list_empty(&data->events)) {
1236                 if (file->f_flags & O_NONBLOCK) {
1237                         ret = -EAGAIN;
1238                         goto out;
1239                 }
1240                 mutex_unlock(&data->mtx);
1241                 /* since we re-check and it just compares pointers,
1242                  * using !list_empty() without locking isn't a problem
1243                  */
1244                 ret = wait_event_interruptible(data->read_wait,
1245                                                !list_empty(&data->events));
1246                 mutex_lock(&data->mtx);
1247
1248                 if (ret)
1249                         goto out;
1250         }
1251
1252         ev = list_first_entry(&data->events, struct rfkill_int_event,
1253                                 list);
1254
1255         sz = min_t(unsigned long, sizeof(ev->ev), count);
1256         sz = min_t(unsigned long, sz, data->max_size);
1257         ret = sz;
1258         if (copy_to_user(buf, &ev->ev, sz))
1259                 ret = -EFAULT;
1260
1261         list_del(&ev->list);
1262         kfree(ev);
1263  out:
1264         mutex_unlock(&data->mtx);
1265         return ret;
1266 }
1267
1268 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1269                                 size_t count, loff_t *pos)
1270 {
1271         struct rfkill_data *data = file->private_data;
1272         struct rfkill *rfkill;
1273         struct rfkill_event_ext ev;
1274         int ret;
1275
1276         /* we don't need the 'hard' variable but accept it */
1277         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1278                 return -EINVAL;
1279
1280         /*
1281          * Copy as much data as we can accept into our 'ev' buffer,
1282          * but tell userspace how much we've copied so it can determine
1283          * our API version even in a write() call, if it cares.
1284          */
1285         count = min(count, sizeof(ev));
1286         count = min_t(size_t, count, data->max_size);
1287         if (copy_from_user(&ev, buf, count))
1288                 return -EFAULT;
1289
1290         if (ev.type >= NUM_RFKILL_TYPES)
1291                 return -EINVAL;
1292
1293         mutex_lock(&rfkill_global_mutex);
1294
1295         switch (ev.op) {
1296         case RFKILL_OP_CHANGE_ALL:
1297                 rfkill_update_global_state(ev.type, ev.soft);
1298                 list_for_each_entry(rfkill, &rfkill_list, node)
1299                         if (rfkill->type == ev.type ||
1300                             ev.type == RFKILL_TYPE_ALL)
1301                                 rfkill_set_block(rfkill, ev.soft);
1302                 ret = 0;
1303                 break;
1304         case RFKILL_OP_CHANGE:
1305                 list_for_each_entry(rfkill, &rfkill_list, node)
1306                         if (rfkill->idx == ev.idx &&
1307                             (rfkill->type == ev.type ||
1308                              ev.type == RFKILL_TYPE_ALL))
1309                                 rfkill_set_block(rfkill, ev.soft);
1310                 ret = 0;
1311                 break;
1312         default:
1313                 ret = -EINVAL;
1314                 break;
1315         }
1316
1317         mutex_unlock(&rfkill_global_mutex);
1318
1319         return ret ?: count;
1320 }
1321
1322 static int rfkill_fop_release(struct inode *inode, struct file *file)
1323 {
1324         struct rfkill_data *data = file->private_data;
1325         struct rfkill_int_event *ev, *tmp;
1326
1327         mutex_lock(&rfkill_global_mutex);
1328         list_del(&data->list);
1329         mutex_unlock(&rfkill_global_mutex);
1330
1331         mutex_destroy(&data->mtx);
1332         list_for_each_entry_safe(ev, tmp, &data->events, list)
1333                 kfree(ev);
1334
1335 #ifdef CONFIG_RFKILL_INPUT
1336         if (data->input_handler)
1337                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1338                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1339 #endif
1340
1341         kfree(data);
1342
1343         return 0;
1344 }
1345
1346 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1347                              unsigned long arg)
1348 {
1349         struct rfkill_data *data = file->private_data;
1350         int ret = -ENOTTY;
1351         u32 size;
1352
1353         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1354                 return -ENOTTY;
1355
1356         mutex_lock(&data->mtx);
1357         switch (_IOC_NR(cmd)) {
1358 #ifdef CONFIG_RFKILL_INPUT
1359         case RFKILL_IOC_NOINPUT:
1360                 if (!data->input_handler) {
1361                         if (atomic_inc_return(&rfkill_input_disabled) == 1)
1362                                 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1363                         data->input_handler = true;
1364                 }
1365                 ret = 0;
1366                 break;
1367 #endif
1368         case RFKILL_IOC_MAX_SIZE:
1369                 if (get_user(size, (__u32 __user *)arg)) {
1370                         ret = -EFAULT;
1371                         break;
1372                 }
1373                 if (size < RFKILL_EVENT_SIZE_V1 || size > U8_MAX) {
1374                         ret = -EINVAL;
1375                         break;
1376                 }
1377                 data->max_size = size;
1378                 ret = 0;
1379                 break;
1380         default:
1381                 break;
1382         }
1383         mutex_unlock(&data->mtx);
1384
1385         return ret;
1386 }
1387
1388 static const struct file_operations rfkill_fops = {
1389         .owner          = THIS_MODULE,
1390         .open           = rfkill_fop_open,
1391         .read           = rfkill_fop_read,
1392         .write          = rfkill_fop_write,
1393         .poll           = rfkill_fop_poll,
1394         .release        = rfkill_fop_release,
1395         .unlocked_ioctl = rfkill_fop_ioctl,
1396         .compat_ioctl   = compat_ptr_ioctl,
1397         .llseek         = no_llseek,
1398 };
1399
1400 #define RFKILL_NAME "rfkill"
1401
1402 static struct miscdevice rfkill_miscdev = {
1403         .fops   = &rfkill_fops,
1404         .name   = RFKILL_NAME,
1405         .minor  = RFKILL_MINOR,
1406 };
1407
1408 static int __init rfkill_init(void)
1409 {
1410         int error;
1411
1412         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1413
1414         error = class_register(&rfkill_class);
1415         if (error)
1416                 goto error_class;
1417
1418         error = misc_register(&rfkill_miscdev);
1419         if (error)
1420                 goto error_misc;
1421
1422         error = rfkill_global_led_trigger_register();
1423         if (error)
1424                 goto error_led_trigger;
1425
1426 #ifdef CONFIG_RFKILL_INPUT
1427         error = rfkill_handler_init();
1428         if (error)
1429                 goto error_input;
1430 #endif
1431
1432         return 0;
1433
1434 #ifdef CONFIG_RFKILL_INPUT
1435 error_input:
1436         rfkill_global_led_trigger_unregister();
1437 #endif
1438 error_led_trigger:
1439         misc_deregister(&rfkill_miscdev);
1440 error_misc:
1441         class_unregister(&rfkill_class);
1442 error_class:
1443         return error;
1444 }
1445 subsys_initcall(rfkill_init);
1446
1447 static void __exit rfkill_exit(void)
1448 {
1449 #ifdef CONFIG_RFKILL_INPUT
1450         rfkill_handler_exit();
1451 #endif
1452         rfkill_global_led_trigger_unregister();
1453         misc_deregister(&rfkill_miscdev);
1454         class_unregister(&rfkill_class);
1455 }
1456 module_exit(rfkill_exit);
1457
1458 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1459 MODULE_ALIAS("devname:" RFKILL_NAME);