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  * calls toggle_radio taking into account a lot of "small"
 134  * details.
 135  * @rfkill: the rfkill struct to use
 136  * @force: calls toggle_radio even if cache says it is not needed,
 137  *      and also makes sure notifications of the state will be
 138  *      sent even if it didn't change
 139  * @state: the new state to call toggle_radio() with
 140  *
 141  * This wrappen protects and enforces the API for toggle_radio
 142  * calls.  Note that @force cannot override a (possibly cached)
 143  * state of RFKILL_STATE_HARD_BLOCKED.  Any device making use of
 144  * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
 145  * rfkill_force_state(), so the cache either is bypassed or valid.
 146  *
 147  * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
 148  * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
 149  * give the driver a hint that it should double-BLOCK the transmitter.
 150  *
 151  * Caller must have aquired rfkill_mutex.
 152  */
 153 static int rfkill_toggle_radio(struct rfkill *rfkill,
 154                                 enum rfkill_state state,
 155                                 int force)
 156 {
 157         int retval = 0;
 158         enum rfkill_state oldstate, newstate;
 159
 160         oldstate = rfkill->state;
 161
 162         if (rfkill->get_state && !force &&
 163             !rfkill->get_state(rfkill->data, &newstate))
 164                 rfkill->state = newstate;
 165
 166         switch (state) {
 167         case RFKILL_STATE_HARD_BLOCKED:
 168                 /* typically happens when refreshing hardware state,
 169                  * such as on resume */
 170                 state = RFKILL_STATE_SOFT_BLOCKED;
 171                 break;
 172         case RFKILL_STATE_UNBLOCKED:
 173                 /* force can't override this, only rfkill_force_state() can */
 174                 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
 175                         return -EPERM;
 176                 break;
 177         case RFKILL_STATE_SOFT_BLOCKED:
 178                 /* nothing to do, we want to give drivers the hint to double
 179                  * BLOCK even a transmitter that is already in state
 180                  * RFKILL_STATE_HARD_BLOCKED */
 181                 break;
 182         }
 183
 184         if (force || state != rfkill->state) {
 185                 retval = rfkill->toggle_radio(rfkill->data, state);
 186                 /* never allow a HARD->SOFT downgrade! */
 187                 if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
 188                         rfkill->state = state;
 189         }
 190
 191         if (force || rfkill->state != oldstate) {
 192                 rfkill_led_trigger(rfkill, rfkill->state);
 193                 notify_rfkill_state_change(rfkill);
 194         }
 195
 196         return retval;
 197 }
 198
 199 /**
 200  * rfkill_switch_all - Toggle state of all switches of given type
 201  * @type: type of interfaces to be affeceted
 202  * @state: the new state
 203  *
 204  * This function toggles state of all switches of given type unless
 205  * a specific switch is claimed by userspace in which case it is
 206  * left alone.
 207  */
 208 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
 209 {
 210         struct rfkill *rfkill;
 211
 212         mutex_lock(&rfkill_mutex);
 213
 214         rfkill_states[type] = state;
 215
 216         list_for_each_entry(rfkill, &rfkill_list, node) {
 217                 if ((!rfkill->user_claim) && (rfkill->type == type))
 218                         rfkill_toggle_radio(rfkill, state, 0);
 219         }
 220
 221         mutex_unlock(&rfkill_mutex);
 222 }
 223 EXPORT_SYMBOL(rfkill_switch_all);
 224
 225 /**
 226  * rfkill_epo - emergency power off all transmitters
 227  *
 228  * This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring
 229  * everything in its path but rfkill_mutex.
 230  */
 231 void rfkill_epo(void)
 232 {
 233         struct rfkill *rfkill;
 234
 235         mutex_lock(&rfkill_mutex);
 236         list_for_each_entry(rfkill, &rfkill_list, node) {
 237                 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
 238         }
 239         mutex_unlock(&rfkill_mutex);
 240 }
 241 EXPORT_SYMBOL_GPL(rfkill_epo);
 242
 243 /**
 244  * rfkill_force_state - Force the internal rfkill radio state
 245  * @rfkill: pointer to the rfkill class to modify.
 246  * @state: the current radio state the class should be forced to.
 247  *
 248  * This function updates the internal state of the radio cached
 249  * by the rfkill class.  It should be used when the driver gets
 250  * a notification by the firmware/hardware of the current *real*
 251  * state of the radio rfkill switch.
 252  *
 253  * It may not be called from an atomic context.
 254  */
 255 int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
 256 {
 257         enum rfkill_state oldstate;
 258
 259         if (state != RFKILL_STATE_SOFT_BLOCKED &&
 260             state != RFKILL_STATE_UNBLOCKED &&
 261             state != RFKILL_STATE_HARD_BLOCKED)
 262                 return -EINVAL;
 263
 264         mutex_lock(&rfkill->mutex);
 265
 266         oldstate = rfkill->state;
 267         rfkill->state = state;
 268
 269         if (state != oldstate)
 270                 notify_rfkill_state_change(rfkill);
 271
 272         mutex_unlock(&rfkill->mutex);
 273
 274         return 0;
 275 }
 276 EXPORT_SYMBOL(rfkill_force_state);
 277
 278 static ssize_t rfkill_name_show(struct device *dev,
 279                                 struct device_attribute *attr,
 280                                 char *buf)
 281 {
 282         struct rfkill *rfkill = to_rfkill(dev);
 283
 284         return sprintf(buf, "%s\n", rfkill->name);
 285 }
 286
 287 static const char *rfkill_get_type_str(enum rfkill_type type)
 288 {
 289         switch (type) {
 290         case RFKILL_TYPE_WLAN:
 291                 return "wlan";
 292         case RFKILL_TYPE_BLUETOOTH:
 293                 return "bluetooth";
 294         case RFKILL_TYPE_UWB:
 295                 return "ultrawideband";
 296         case RFKILL_TYPE_WIMAX:
 297                 return "wimax";
 298         case RFKILL_TYPE_WWAN:
 299                 return "wwan";
 300         default:
 301                 BUG();
 302         }
 303 }
 304
 305 static ssize_t rfkill_type_show(struct device *dev,
 306                                 struct device_attribute *attr,
 307                                 char *buf)
 308 {
 309         struct rfkill *rfkill = to_rfkill(dev);
 310
 311         return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
 312 }
 313
 314 static ssize_t rfkill_state_show(struct device *dev,
 315                                  struct device_attribute *attr,
 316                                  char *buf)
 317 {
 318         struct rfkill *rfkill = to_rfkill(dev);
 319
 320         update_rfkill_state(rfkill);
 321         return sprintf(buf, "%d\n", rfkill->state);
 322 }
 323
 324 static ssize_t rfkill_state_store(struct device *dev,
 325                                   struct device_attribute *attr,
 326                                   const char *buf, size_t count)
 327 {
 328         struct rfkill *rfkill = to_rfkill(dev);
 329         unsigned int state = simple_strtoul(buf, NULL, 0);
 330         int error;
 331
 332         if (!capable(CAP_NET_ADMIN))
 333                 return -EPERM;
 334
 335         /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
 336         if (state != RFKILL_STATE_UNBLOCKED &&
 337             state != RFKILL_STATE_SOFT_BLOCKED)
 338                 return -EINVAL;
 339
 340         if (mutex_lock_interruptible(&rfkill->mutex))
 341                 return -ERESTARTSYS;
 342         error = rfkill_toggle_radio(rfkill, state, 0);
 343         mutex_unlock(&rfkill->mutex);
 344
 345         return error ? error : count;
 346 }
 347
 348 static ssize_t rfkill_claim_show(struct device *dev,
 349                                  struct device_attribute *attr,
 350                                  char *buf)
 351 {
 352         struct rfkill *rfkill = to_rfkill(dev);
 353
 354         return sprintf(buf, "%d", rfkill->user_claim);
 355 }
 356
 357 static ssize_t rfkill_claim_store(struct device *dev,
 358                                   struct device_attribute *attr,
 359                                   const char *buf, size_t count)
 360 {
 361         struct rfkill *rfkill = to_rfkill(dev);
 362         bool claim = !!simple_strtoul(buf, NULL, 0);
 363         int error;
 364
 365         if (!capable(CAP_NET_ADMIN))
 366                 return -EPERM;
 367
 368         /*
 369          * Take the global lock to make sure the kernel is not in
 370          * the middle of rfkill_switch_all
 371          */
 372         error = mutex_lock_interruptible(&rfkill_mutex);
 373         if (error)
 374                 return error;
 375
 376         if (rfkill->user_claim_unsupported) {
 377                 error = -EOPNOTSUPP;
 378                 goto out_unlock;
 379         }
 380         if (rfkill->user_claim != claim) {
 381                 if (!claim)
 382                         rfkill_toggle_radio(rfkill,
 383                                             rfkill_states[rfkill->type],
 384                                             0);
 385                 rfkill->user_claim = claim;
 386         }
 387
 388 out_unlock:
 389         mutex_unlock(&rfkill_mutex);
 390
 391         return error ? error : count;
 392 }
 393
 394 static struct device_attribute rfkill_dev_attrs[] = {
 395         __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
 396         __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
 397         __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 398         __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
 399         __ATTR_NULL
 400 };
 401
 402 static void rfkill_release(struct device *dev)
 403 {
 404         struct rfkill *rfkill = to_rfkill(dev);
 405
 406         kfree(rfkill);
 407         module_put(THIS_MODULE);
 408 }
 409
 410 #ifdef CONFIG_PM
 411 static int rfkill_suspend(struct device *dev, pm_message_t state)
 412 {
 413         struct rfkill *rfkill = to_rfkill(dev);
 414
 415         if (dev->power.power_state.event != state.event) {
 416                 if (state.event & PM_EVENT_SLEEP) {
 417                         /* Stop transmitter, keep state, no notifies */
 418                         update_rfkill_state(rfkill);
 419
 420                         mutex_lock(&rfkill->mutex);
 421                         rfkill->toggle_radio(rfkill->data,
 422                                                 RFKILL_STATE_SOFT_BLOCKED);
 423                         mutex_unlock(&rfkill->mutex);
 424                 }
 425
 426                 dev->power.power_state = state;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int rfkill_resume(struct device *dev)
 433 {
 434         struct rfkill *rfkill = to_rfkill(dev);
 435
 436         if (dev->power.power_state.event != PM_EVENT_ON) {
 437                 mutex_lock(&rfkill->mutex);
 438
 439                 /* restore radio state AND notify everybody */
 440                 rfkill_toggle_radio(rfkill, rfkill->state, 1);
 441
 442                 mutex_unlock(&rfkill->mutex);
 443         }
 444
 445         dev->power.power_state = PMSG_ON;
 446         return 0;
 447 }
 448 #else
 449 #define rfkill_suspend NULL
 450 #define rfkill_resume NULL
 451 #endif
 452
 453 static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
 454                                         unsigned long eventid,
 455                                         void *data)
 456 {
 457         struct rfkill *rfkill = (struct rfkill *)data;
 458
 459         switch (eventid) {
 460         case RFKILL_STATE_CHANGED:
 461                 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 462                 break;
 463         default:
 464                 break;
 465         }
 466
 467         return NOTIFY_DONE;
 468 }
 469
 470 static struct notifier_block rfkill_blocking_uevent_nb = {
 471         .notifier_call  = rfkill_blocking_uevent_notifier,
 472         .priority       = 0,
 473 };
 474
 475 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 476 {
 477         struct rfkill *rfkill = to_rfkill(dev);
 478         int error;
 479
 480         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 481         if (error)
 482                 return error;
 483         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 484                                 rfkill_get_type_str(rfkill->type));
 485         if (error)
 486                 return error;
 487         error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
 488         return error;
 489 }
 490
 491 static struct class rfkill_class = {
 492         .name           = "rfkill",
 493         .dev_release    = rfkill_release,
 494         .dev_attrs      = rfkill_dev_attrs,
 495         .suspend        = rfkill_suspend,
 496         .resume         = rfkill_resume,
 497         .dev_uevent     = rfkill_dev_uevent,
 498 };
 499
 500 static int rfkill_add_switch(struct rfkill *rfkill)
 501 {
 502         int error;
 503
 504         mutex_lock(&rfkill_mutex);
 505
 506         error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
 507         if (!error)
 508                 list_add_tail(&rfkill->node, &rfkill_list);
 509
 510         mutex_unlock(&rfkill_mutex);
 511
 512         return error;
 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);