git.oblomov.eu Git - linux-2.6/blob - net/rfkill/rfkill.c

   1 /*
   2  * Copyright (C) 2006 - 2007 Ivo van Doorn
   3  * Copyright (C) 2007 Dmitry Torokhov
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/capability.h>
  26 #include <linux/list.h>
  27 #include <linux/mutex.h>
  28 #include <linux/rfkill.h>
  29
  30 /* Get declaration of rfkill_switch_all() to shut up sparse. */
  31 #include "rfkill-input.h"
  32
  33
  34 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  35 MODULE_VERSION("1.0");
  36 MODULE_DESCRIPTION("RF switch support");
  37 MODULE_LICENSE("GPL");
  38
  39 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
  40 static DEFINE_MUTEX(rfkill_mutex);
  41
  42 static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED;
  43 module_param_named(default_state, rfkill_default_state, uint, 0444);
  44 MODULE_PARM_DESC(default_state,
  45                  "Default initial state for all radio types, 0 = radio off");
  46
  47 static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
  48
  49 static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
  50
  51
  52 /**
  53  * register_rfkill_notifier - Add notifier to rfkill notifier chain
  54  * @nb: pointer to the new entry to add to the chain
  55  *
  56  * See blocking_notifier_chain_register() for return value and further
  57  * observations.
  58  *
  59  * Adds a notifier to the rfkill notifier chain.  The chain will be
  60  * called with a pointer to the relevant rfkill structure as a parameter,
  61  * refer to include/linux/rfkill.h for the possible events.
  62  *
  63  * Notifiers added to this chain are to always return NOTIFY_DONE.  This
  64  * chain is a blocking notifier chain: notifiers can sleep.
  65  *
  66  * Calls to this chain may have been done through a workqueue.  One must
  67  * assume unordered asynchronous behaviour, there is no way to know if
  68  * actions related to the event that generated the notification have been
  69  * carried out already.
  70  */
  71 int register_rfkill_notifier(struct notifier_block *nb)
  72 {
  73         return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
  74 }
  75 EXPORT_SYMBOL_GPL(register_rfkill_notifier);
  76
  77 /**
  78  * unregister_rfkill_notifier - remove notifier from rfkill notifier chain
  79  * @nb: pointer to the entry to remove from the chain
  80  *
  81  * See blocking_notifier_chain_unregister() for return value and further
  82  * observations.
  83  *
  84  * Removes a notifier from the rfkill notifier chain.
  85  */
  86 int unregister_rfkill_notifier(struct notifier_block *nb)
  87 {
  88         return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
  89 }
  90 EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
  91
  92
  93 static void rfkill_led_trigger(struct rfkill *rfkill,
  94                                enum rfkill_state state)
  95 {
  96 #ifdef CONFIG_RFKILL_LEDS
  97         struct led_trigger *led = &rfkill->led_trigger;
  98
  99         if (!led->name)
 100                 return;
 101         if (state != RFKILL_STATE_UNBLOCKED)
 102                 led_trigger_event(led, LED_OFF);
 103         else
 104                 led_trigger_event(led, LED_FULL);
 105 #endif /* CONFIG_RFKILL_LEDS */
 106 }
 107
 108 static void notify_rfkill_state_change(struct rfkill *rfkill)
 109 {
 110         blocking_notifier_call_chain(&rfkill_notifier_list,
 111                         RFKILL_STATE_CHANGED,
 112                         rfkill);
 113 }
 114
 115 static void update_rfkill_state(struct rfkill *rfkill)
 116 {
 117         enum rfkill_state newstate, oldstate;
 118
 119         if (rfkill->get_state) {
 120                 mutex_lock(&rfkill->mutex);
 121                 if (!rfkill->get_state(rfkill->data, &newstate)) {
 122                         oldstate = rfkill->state;
 123                         rfkill->state = newstate;
 124                         if (oldstate != newstate)
 125                                 notify_rfkill_state_change(rfkill);
 126                 }
 127                 mutex_unlock(&rfkill->mutex);
 128         }
 129 }
 130
 131 /**
 132  * rfkill_toggle_radio - wrapper for toggle_radio hook
 133  *
 134  * @rfkill: the rfkill struct to use
 135  * @force: calls toggle_radio even if cache says it is not needed,
 136  *      and also makes sure notifications of the state will be
 137  *      sent even if it didn't change
 138  * @state: the new state to call toggle_radio() with
 139  *
 140  * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
 141  * calls and handling all the red tape such as issuing notifications
 142  * if the call is successful.
 143  *
 144  * Note that @force cannot override a (possibly cached) state of
 145  * RFKILL_STATE_HARD_BLOCKED.  Any device making use of
 146  * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
 147  * rfkill_force_state(), so the cache either is bypassed or valid.
 148  *
 149  * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
 150  * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
 151  * give the driver a hint that it should double-BLOCK the transmitter.
 152  *
 153  * Caller must have aquired rfkill_mutex.
 154  */
 155 static int rfkill_toggle_radio(struct rfkill *rfkill,
 156                                 enum rfkill_state state,
 157                                 int force)
 158 {
 159         int retval = 0;
 160         enum rfkill_state oldstate, newstate;
 161
 162         oldstate = rfkill->state;
 163
 164         if (rfkill->get_state && !force &&
 165             !rfkill->get_state(rfkill->data, &newstate))
 166                 rfkill->state = newstate;
 167
 168         switch (state) {
 169         case RFKILL_STATE_HARD_BLOCKED:
 170                 /* typically happens when refreshing hardware state,
 171                  * such as on resume */
 172                 state = RFKILL_STATE_SOFT_BLOCKED;
 173                 break;
 174         case RFKILL_STATE_UNBLOCKED:
 175                 /* force can't override this, only rfkill_force_state() can */
 176                 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
 177                         return -EPERM;
 178                 break;
 179         case RFKILL_STATE_SOFT_BLOCKED:
 180                 /* nothing to do, we want to give drivers the hint to double
 181                  * BLOCK even a transmitter that is already in state
 182                  * RFKILL_STATE_HARD_BLOCKED */
 183                 break;
 184         }
 185
 186         if (force || state != rfkill->state) {
 187                 retval = rfkill->toggle_radio(rfkill->data, state);
 188                 /* never allow a HARD->SOFT downgrade! */
 189                 if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
 190                         rfkill->state = state;
 191         }
 192
 193         if (force || rfkill->state != oldstate) {
 194                 rfkill_led_trigger(rfkill, rfkill->state);
 195                 notify_rfkill_state_change(rfkill);
 196         }
 197
 198         return retval;
 199 }
 200
 201 /**
 202  * rfkill_switch_all - Toggle state of all switches of given type
 203  * @type: type of interfaces to be affeceted
 204  * @state: the new state
 205  *
 206  * This function toggles state of all switches of given type unless
 207  * a specific switch is claimed by userspace in which case it is
 208  * left alone.
 209  */
 210 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
 211 {
 212         struct rfkill *rfkill;
 213
 214         mutex_lock(&rfkill_mutex);
 215
 216         rfkill_states[type] = state;
 217
 218         list_for_each_entry(rfkill, &rfkill_list, node) {
 219                 if ((!rfkill->user_claim) && (rfkill->type == type))
 220                         rfkill_toggle_radio(rfkill, state, 0);
 221         }
 222
 223         mutex_unlock(&rfkill_mutex);
 224 }
 225 EXPORT_SYMBOL(rfkill_switch_all);
 226
 227 /**
 228  * rfkill_epo - emergency power off all transmitters
 229  *
 230  * This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring
 231  * everything in its path but rfkill_mutex.
 232  */
 233 void rfkill_epo(void)
 234 {
 235         struct rfkill *rfkill;
 236
 237         mutex_lock(&rfkill_mutex);
 238         list_for_each_entry(rfkill, &rfkill_list, node) {
 239                 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
 240         }
 241         mutex_unlock(&rfkill_mutex);
 242 }
 243 EXPORT_SYMBOL_GPL(rfkill_epo);
 244
 245 /**
 246  * rfkill_force_state - Force the internal rfkill radio state
 247  * @rfkill: pointer to the rfkill class to modify.
 248  * @state: the current radio state the class should be forced to.
 249  *
 250  * This function updates the internal state of the radio cached
 251  * by the rfkill class.  It should be used when the driver gets
 252  * a notification by the firmware/hardware of the current *real*
 253  * state of the radio rfkill switch.
 254  *
 255  * It may not be called from an atomic context.
 256  */
 257 int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
 258 {
 259         enum rfkill_state oldstate;
 260
 261         if (state != RFKILL_STATE_SOFT_BLOCKED &&
 262             state != RFKILL_STATE_UNBLOCKED &&
 263             state != RFKILL_STATE_HARD_BLOCKED)
 264                 return -EINVAL;
 265
 266         mutex_lock(&rfkill->mutex);
 267
 268         oldstate = rfkill->state;
 269         rfkill->state = state;
 270
 271         if (state != oldstate)
 272                 notify_rfkill_state_change(rfkill);
 273
 274         mutex_unlock(&rfkill->mutex);
 275
 276         return 0;
 277 }
 278 EXPORT_SYMBOL(rfkill_force_state);
 279
 280 static ssize_t rfkill_name_show(struct device *dev,
 281                                 struct device_attribute *attr,
 282                                 char *buf)
 283 {
 284         struct rfkill *rfkill = to_rfkill(dev);
 285
 286         return sprintf(buf, "%s\n", rfkill->name);
 287 }
 288
 289 static const char *rfkill_get_type_str(enum rfkill_type type)
 290 {
 291         switch (type) {
 292         case RFKILL_TYPE_WLAN:
 293                 return "wlan";
 294         case RFKILL_TYPE_BLUETOOTH:
 295                 return "bluetooth";
 296         case RFKILL_TYPE_UWB:
 297                 return "ultrawideband";
 298         case RFKILL_TYPE_WIMAX:
 299                 return "wimax";
 300         case RFKILL_TYPE_WWAN:
 301                 return "wwan";
 302         default:
 303                 BUG();
 304         }
 305 }
 306
 307 static ssize_t rfkill_type_show(struct device *dev,
 308                                 struct device_attribute *attr,
 309                                 char *buf)
 310 {
 311         struct rfkill *rfkill = to_rfkill(dev);
 312
 313         return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
 314 }
 315
 316 static ssize_t rfkill_state_show(struct device *dev,
 317                                  struct device_attribute *attr,
 318                                  char *buf)
 319 {
 320         struct rfkill *rfkill = to_rfkill(dev);
 321
 322         update_rfkill_state(rfkill);
 323         return sprintf(buf, "%d\n", rfkill->state);
 324 }
 325
 326 static ssize_t rfkill_state_store(struct device *dev,
 327                                   struct device_attribute *attr,
 328                                   const char *buf, size_t count)
 329 {
 330         struct rfkill *rfkill = to_rfkill(dev);
 331         unsigned int state = simple_strtoul(buf, NULL, 0);
 332         int error;
 333
 334         if (!capable(CAP_NET_ADMIN))
 335                 return -EPERM;
 336
 337         /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
 338         if (state != RFKILL_STATE_UNBLOCKED &&
 339             state != RFKILL_STATE_SOFT_BLOCKED)
 340                 return -EINVAL;
 341
 342         if (mutex_lock_interruptible(&rfkill->mutex))
 343                 return -ERESTARTSYS;
 344         error = rfkill_toggle_radio(rfkill, state, 0);
 345         mutex_unlock(&rfkill->mutex);
 346
 347         return error ? error : count;
 348 }
 349
 350 static ssize_t rfkill_claim_show(struct device *dev,
 351                                  struct device_attribute *attr,
 352                                  char *buf)
 353 {
 354         struct rfkill *rfkill = to_rfkill(dev);
 355
 356         return sprintf(buf, "%d", rfkill->user_claim);
 357 }
 358
 359 static ssize_t rfkill_claim_store(struct device *dev,
 360                                   struct device_attribute *attr,
 361                                   const char *buf, size_t count)
 362 {
 363         struct rfkill *rfkill = to_rfkill(dev);
 364         bool claim = !!simple_strtoul(buf, NULL, 0);
 365         int error;
 366
 367         if (!capable(CAP_NET_ADMIN))
 368                 return -EPERM;
 369
 370         /*
 371          * Take the global lock to make sure the kernel is not in
 372          * the middle of rfkill_switch_all
 373          */
 374         error = mutex_lock_interruptible(&rfkill_mutex);
 375         if (error)
 376                 return error;
 377
 378         if (rfkill->user_claim_unsupported) {
 379                 error = -EOPNOTSUPP;
 380                 goto out_unlock;
 381         }
 382         if (rfkill->user_claim != claim) {
 383                 if (!claim)
 384                         rfkill_toggle_radio(rfkill,
 385                                             rfkill_states[rfkill->type],
 386                                             0);
 387                 rfkill->user_claim = claim;
 388         }
 389
 390 out_unlock:
 391         mutex_unlock(&rfkill_mutex);
 392
 393         return error ? error : count;
 394 }
 395
 396 static struct device_attribute rfkill_dev_attrs[] = {
 397         __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
 398         __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
 399         __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 400         __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
 401         __ATTR_NULL
 402 };
 403
 404 static void rfkill_release(struct device *dev)
 405 {
 406         struct rfkill *rfkill = to_rfkill(dev);
 407
 408         kfree(rfkill);
 409         module_put(THIS_MODULE);
 410 }
 411
 412 #ifdef CONFIG_PM
 413 static int rfkill_suspend(struct device *dev, pm_message_t state)
 414 {
 415         struct rfkill *rfkill = to_rfkill(dev);
 416
 417         if (dev->power.power_state.event != state.event) {
 418                 if (state.event & PM_EVENT_SLEEP) {
 419                         /* Stop transmitter, keep state, no notifies */
 420                         update_rfkill_state(rfkill);
 421
 422                         mutex_lock(&rfkill->mutex);
 423                         rfkill->toggle_radio(rfkill->data,
 424                                                 RFKILL_STATE_SOFT_BLOCKED);
 425                         mutex_unlock(&rfkill->mutex);
 426                 }
 427
 428                 dev->power.power_state = state;
 429         }
 430
 431         return 0;
 432 }
 433
 434 static int rfkill_resume(struct device *dev)
 435 {
 436         struct rfkill *rfkill = to_rfkill(dev);
 437
 438         if (dev->power.power_state.event != PM_EVENT_ON) {
 439                 mutex_lock(&rfkill->mutex);
 440
 441                 /* restore radio state AND notify everybody */
 442                 rfkill_toggle_radio(rfkill, rfkill->state, 1);
 443
 444                 mutex_unlock(&rfkill->mutex);
 445         }
 446
 447         dev->power.power_state = PMSG_ON;
 448         return 0;
 449 }
 450 #else
 451 #define rfkill_suspend NULL
 452 #define rfkill_resume NULL
 453 #endif
 454
 455 static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
 456                                         unsigned long eventid,
 457                                         void *data)
 458 {
 459         struct rfkill *rfkill = (struct rfkill *)data;
 460
 461         switch (eventid) {
 462         case RFKILL_STATE_CHANGED:
 463                 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 464                 break;
 465         default:
 466                 break;
 467         }
 468
 469         return NOTIFY_DONE;
 470 }
 471
 472 static struct notifier_block rfkill_blocking_uevent_nb = {
 473         .notifier_call  = rfkill_blocking_uevent_notifier,
 474         .priority       = 0,
 475 };
 476
 477 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 478 {
 479         struct rfkill *rfkill = to_rfkill(dev);
 480         int error;
 481
 482         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 483         if (error)
 484                 return error;
 485         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 486                                 rfkill_get_type_str(rfkill->type));
 487         if (error)
 488                 return error;
 489         error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
 490         return error;
 491 }
 492
 493 static struct class rfkill_class = {
 494         .name           = "rfkill",
 495         .dev_release    = rfkill_release,
 496         .dev_attrs      = rfkill_dev_attrs,
 497         .suspend        = rfkill_suspend,
 498         .resume         = rfkill_resume,
 499         .dev_uevent     = rfkill_dev_uevent,
 500 };
 501
 502 static int rfkill_add_switch(struct rfkill *rfkill)
 503 {
 504         mutex_lock(&rfkill_mutex);
 505
 506         rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
 507
 508         list_add_tail(&rfkill->node, &rfkill_list);
 509
 510         mutex_unlock(&rfkill_mutex);
 511
 512         return 0;
 513 }
 514
 515 static void rfkill_remove_switch(struct rfkill *rfkill)
 516 {
 517         mutex_lock(&rfkill_mutex);
 518         list_del_init(&rfkill->node);
 519         rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
 520         mutex_unlock(&rfkill_mutex);
 521 }
 522
 523 /**
 524  * rfkill_allocate - allocate memory for rfkill structure.
 525  * @parent: device that has rf switch on it
 526  * @type: type of the switch (RFKILL_TYPE_*)
 527  *
 528  * This function should be called by the network driver when it needs
 529  * rfkill structure. Once the structure is allocated the driver shoud
 530  * finish its initialization by setting name, private data, enable_radio
 531  * and disable_radio methods and then register it with rfkill_register().
 532  * NOTE: If registration fails the structure shoudl be freed by calling
 533  * rfkill_free() otherwise rfkill_unregister() should be used.
 534  */
 535 struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
 536 {
 537         struct rfkill *rfkill;
 538         struct device *dev;
 539
 540         rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
 541         if (!rfkill)
 542                 return NULL;
 543
 544         mutex_init(&rfkill->mutex);
 545         INIT_LIST_HEAD(&rfkill->node);
 546         rfkill->type = type;
 547
 548         dev = &rfkill->dev;
 549         dev->class = &rfkill_class;
 550         dev->parent = parent;
 551         device_initialize(dev);
 552
 553         __module_get(THIS_MODULE);
 554
 555         return rfkill;
 556 }
 557 EXPORT_SYMBOL(rfkill_allocate);
 558
 559 /**
 560  * rfkill_free - Mark rfkill structure for deletion
 561  * @rfkill: rfkill structure to be destroyed
 562  *
 563  * Decrements reference count of rfkill structure so it is destroyed.
 564  * Note that rfkill_free() should _not_ be called after rfkill_unregister().
 565  */
 566 void rfkill_free(struct rfkill *rfkill)
 567 {
 568         if (rfkill)
 569                 put_device(&rfkill->dev);
 570 }
 571 EXPORT_SYMBOL(rfkill_free);
 572
 573 static void rfkill_led_trigger_register(struct rfkill *rfkill)
 574 {
 575 #ifdef CONFIG_RFKILL_LEDS
 576         int error;
 577
 578         rfkill->led_trigger.name = rfkill->dev.bus_id;
 579         error = led_trigger_register(&rfkill->led_trigger);
 580         if (error)
 581                 rfkill->led_trigger.name = NULL;
 582 #endif /* CONFIG_RFKILL_LEDS */
 583 }
 584
 585 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 586 {
 587 #ifdef CONFIG_RFKILL_LEDS
 588         if (rfkill->led_trigger.name)
 589                 led_trigger_unregister(&rfkill->led_trigger);
 590 #endif
 591 }
 592
 593 /**
 594  * rfkill_register - Register a rfkill structure.
 595  * @rfkill: rfkill structure to be registered
 596  *
 597  * This function should be called by the network driver when the rfkill
 598  * structure needs to be registered. Immediately from registration the
 599  * switch driver should be able to service calls to toggle_radio.
 600  */
 601 int rfkill_register(struct rfkill *rfkill)
 602 {
 603         static atomic_t rfkill_no = ATOMIC_INIT(0);
 604         struct device *dev = &rfkill->dev;
 605         int error;
 606
 607         if (!rfkill->toggle_radio)
 608                 return -EINVAL;
 609         if (rfkill->type >= RFKILL_TYPE_MAX)
 610                 return -EINVAL;
 611
 612         snprintf(dev->bus_id, sizeof(dev->bus_id),
 613                  "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
 614
 615         rfkill_led_trigger_register(rfkill);
 616
 617         error = rfkill_add_switch(rfkill);
 618         if (error) {
 619                 rfkill_led_trigger_unregister(rfkill);
 620                 return error;
 621         }
 622
 623         error = device_add(dev);
 624         if (error) {
 625                 rfkill_led_trigger_unregister(rfkill);
 626                 rfkill_remove_switch(rfkill);
 627                 return error;
 628         }
 629
 630         return 0;
 631 }
 632 EXPORT_SYMBOL(rfkill_register);
 633
 634 /**
 635  * rfkill_unregister - Unregister a rfkill structure.
 636  * @rfkill: rfkill structure to be unregistered
 637  *
 638  * This function should be called by the network driver during device
 639  * teardown to destroy rfkill structure. Note that rfkill_free() should
 640  * _not_ be called after rfkill_unregister().
 641  */
 642 void rfkill_unregister(struct rfkill *rfkill)
 643 {
 644         device_del(&rfkill->dev);
 645         rfkill_remove_switch(rfkill);
 646         rfkill_led_trigger_unregister(rfkill);
 647         put_device(&rfkill->dev);
 648 }
 649 EXPORT_SYMBOL(rfkill_unregister);
 650
 651 /*
 652  * Rfkill module initialization/deinitialization.
 653  */
 654 static int __init rfkill_init(void)
 655 {
 656         int error;
 657         int i;
 658
 659         /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
 660         if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
 661             rfkill_default_state != RFKILL_STATE_UNBLOCKED)
 662                 return -EINVAL;
 663
 664         for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
 665                 rfkill_states[i] = rfkill_default_state;
 666
 667         error = class_register(&rfkill_class);
 668         if (error) {
 669                 printk(KERN_ERR "rfkill: unable to register rfkill class\n");
 670                 return error;
 671         }
 672
 673         register_rfkill_notifier(&rfkill_blocking_uevent_nb);
 674
 675         return 0;
 676 }
 677
 678 static void __exit rfkill_exit(void)
 679 {
 680         unregister_rfkill_notifier(&rfkill_blocking_uevent_nb);
 681         class_unregister(&rfkill_class);
 682 }
 683
 684 subsys_initcall(rfkill_init);
 685 module_exit(rfkill_exit);