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 #ifdef CONFIG_RFKILL_LEDS
 109 static void rfkill_led_trigger_activate(struct led_classdev *led)
 110 {
 111         struct rfkill *rfkill = container_of(led->trigger,
 112                         struct rfkill, led_trigger);
 113
 114         rfkill_led_trigger(rfkill, rfkill->state);
 115 }
 116 #endif /* CONFIG_RFKILL_LEDS */
 117
 118 static void notify_rfkill_state_change(struct rfkill *rfkill)
 119 {
 120         blocking_notifier_call_chain(&rfkill_notifier_list,
 121                         RFKILL_STATE_CHANGED,
 122                         rfkill);
 123 }
 124
 125 static void update_rfkill_state(struct rfkill *rfkill)
 126 {
 127         enum rfkill_state newstate, oldstate;
 128
 129         if (rfkill->get_state) {
 130                 mutex_lock(&rfkill->mutex);
 131                 if (!rfkill->get_state(rfkill->data, &newstate)) {
 132                         oldstate = rfkill->state;
 133                         rfkill->state = newstate;
 134                         if (oldstate != newstate)
 135                                 notify_rfkill_state_change(rfkill);
 136                 }
 137                 mutex_unlock(&rfkill->mutex);
 138         }
 139 }
 140
 141 /**
 142  * rfkill_toggle_radio - wrapper for toggle_radio hook
 143  * @rfkill: the rfkill struct to use
 144  * @force: calls toggle_radio even if cache says it is not needed,
 145  *      and also makes sure notifications of the state will be
 146  *      sent even if it didn't change
 147  * @state: the new state to call toggle_radio() with
 148  *
 149  * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
 150  * calls and handling all the red tape such as issuing notifications
 151  * if the call is successful.
 152  *
 153  * Note that the @force parameter cannot override a (possibly cached)
 154  * state of RFKILL_STATE_HARD_BLOCKED.  Any device making use of
 155  * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
 156  * rfkill_force_state(), so the cache either is bypassed or valid.
 157  *
 158  * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
 159  * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
 160  * give the driver a hint that it should double-BLOCK the transmitter.
 161  *
 162  * Caller must have acquired rfkill->mutex.
 163  */
 164 static int rfkill_toggle_radio(struct rfkill *rfkill,
 165                                 enum rfkill_state state,
 166                                 int force)
 167 {
 168         int retval = 0;
 169         enum rfkill_state oldstate, newstate;
 170
 171         oldstate = rfkill->state;
 172
 173         if (rfkill->get_state && !force &&
 174             !rfkill->get_state(rfkill->data, &newstate))
 175                 rfkill->state = newstate;
 176
 177         switch (state) {
 178         case RFKILL_STATE_HARD_BLOCKED:
 179                 /* typically happens when refreshing hardware state,
 180                  * such as on resume */
 181                 state = RFKILL_STATE_SOFT_BLOCKED;
 182                 break;
 183         case RFKILL_STATE_UNBLOCKED:
 184                 /* force can't override this, only rfkill_force_state() can */
 185                 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
 186                         return -EPERM;
 187                 break;
 188         case RFKILL_STATE_SOFT_BLOCKED:
 189                 /* nothing to do, we want to give drivers the hint to double
 190                  * BLOCK even a transmitter that is already in state
 191                  * RFKILL_STATE_HARD_BLOCKED */
 192                 break;
 193         }
 194
 195         if (force || state != rfkill->state) {
 196                 retval = rfkill->toggle_radio(rfkill->data, state);
 197                 /* never allow a HARD->SOFT downgrade! */
 198                 if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
 199                         rfkill->state = state;
 200         }
 201
 202         if (force || rfkill->state != oldstate) {
 203                 rfkill_led_trigger(rfkill, rfkill->state);
 204                 notify_rfkill_state_change(rfkill);
 205         }
 206
 207         return retval;
 208 }
 209
 210 /**
 211  * rfkill_switch_all - Toggle state of all switches of given type
 212  * @type: type of interfaces to be affected
 213  * @state: the new state
 214  *
 215  * This function toggles the state of all switches of given type,
 216  * unless a specific switch is claimed by userspace (in which case,
 217  * that switch is left alone).
 218  */
 219 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
 220 {
 221         struct rfkill *rfkill;
 222
 223         mutex_lock(&rfkill_mutex);
 224
 225         rfkill_states[type] = state;
 226
 227         list_for_each_entry(rfkill, &rfkill_list, node) {
 228                 if ((!rfkill->user_claim) && (rfkill->type == type)) {
 229                         mutex_lock(&rfkill->mutex);
 230                         rfkill_toggle_radio(rfkill, state, 0);
 231                         mutex_unlock(&rfkill->mutex);
 232                 }
 233         }
 234
 235         mutex_unlock(&rfkill_mutex);
 236 }
 237 EXPORT_SYMBOL(rfkill_switch_all);
 238
 239 /**
 240  * rfkill_epo - emergency power off all transmitters
 241  *
 242  * This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring
 243  * everything in its path but rfkill_mutex and rfkill->mutex.
 244  */
 245 void rfkill_epo(void)
 246 {
 247         struct rfkill *rfkill;
 248
 249         mutex_lock(&rfkill_mutex);
 250         list_for_each_entry(rfkill, &rfkill_list, node) {
 251                 mutex_lock(&rfkill->mutex);
 252                 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
 253                 mutex_unlock(&rfkill->mutex);
 254         }
 255         mutex_unlock(&rfkill_mutex);
 256 }
 257 EXPORT_SYMBOL_GPL(rfkill_epo);
 258
 259 /**
 260  * rfkill_force_state - Force the internal rfkill radio state
 261  * @rfkill: pointer to the rfkill class to modify.
 262  * @state: the current radio state the class should be forced to.
 263  *
 264  * This function updates the internal state of the radio cached
 265  * by the rfkill class.  It should be used when the driver gets
 266  * a notification by the firmware/hardware of the current *real*
 267  * state of the radio rfkill switch.
 268  *
 269  * Devices which are subject to external changes on their rfkill
 270  * state (such as those caused by a hardware rfkill line) MUST
 271  * have their driver arrange to call rfkill_force_state() as soon
 272  * as possible after such a change.
 273  *
 274  * This function may not be called from an atomic context.
 275  */
 276 int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
 277 {
 278         enum rfkill_state oldstate;
 279
 280         if (state != RFKILL_STATE_SOFT_BLOCKED &&
 281             state != RFKILL_STATE_UNBLOCKED &&
 282             state != RFKILL_STATE_HARD_BLOCKED)
 283                 return -EINVAL;
 284
 285         mutex_lock(&rfkill->mutex);
 286
 287         oldstate = rfkill->state;
 288         rfkill->state = state;
 289
 290         if (state != oldstate)
 291                 notify_rfkill_state_change(rfkill);
 292
 293         mutex_unlock(&rfkill->mutex);
 294
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(rfkill_force_state);
 298
 299 static ssize_t rfkill_name_show(struct device *dev,
 300                                 struct device_attribute *attr,
 301                                 char *buf)
 302 {
 303         struct rfkill *rfkill = to_rfkill(dev);
 304
 305         return sprintf(buf, "%s\n", rfkill->name);
 306 }
 307
 308 static const char *rfkill_get_type_str(enum rfkill_type type)
 309 {
 310         switch (type) {
 311         case RFKILL_TYPE_WLAN:
 312                 return "wlan";
 313         case RFKILL_TYPE_BLUETOOTH:
 314                 return "bluetooth";
 315         case RFKILL_TYPE_UWB:
 316                 return "ultrawideband";
 317         case RFKILL_TYPE_WIMAX:
 318                 return "wimax";
 319         case RFKILL_TYPE_WWAN:
 320                 return "wwan";
 321         default:
 322                 BUG();
 323         }
 324 }
 325
 326 static ssize_t rfkill_type_show(struct device *dev,
 327                                 struct device_attribute *attr,
 328                                 char *buf)
 329 {
 330         struct rfkill *rfkill = to_rfkill(dev);
 331
 332         return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
 333 }
 334
 335 static ssize_t rfkill_state_show(struct device *dev,
 336                                  struct device_attribute *attr,
 337                                  char *buf)
 338 {
 339         struct rfkill *rfkill = to_rfkill(dev);
 340
 341         update_rfkill_state(rfkill);
 342         return sprintf(buf, "%d\n", rfkill->state);
 343 }
 344
 345 static ssize_t rfkill_state_store(struct device *dev,
 346                                   struct device_attribute *attr,
 347                                   const char *buf, size_t count)
 348 {
 349         struct rfkill *rfkill = to_rfkill(dev);
 350         unsigned int state = simple_strtoul(buf, NULL, 0);
 351         int error;
 352
 353         if (!capable(CAP_NET_ADMIN))
 354                 return -EPERM;
 355
 356         /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
 357         if (state != RFKILL_STATE_UNBLOCKED &&
 358             state != RFKILL_STATE_SOFT_BLOCKED)
 359                 return -EINVAL;
 360
 361         if (mutex_lock_interruptible(&rfkill->mutex))
 362                 return -ERESTARTSYS;
 363         error = rfkill_toggle_radio(rfkill, state, 0);
 364         mutex_unlock(&rfkill->mutex);
 365
 366         return error ? error : count;
 367 }
 368
 369 static ssize_t rfkill_claim_show(struct device *dev,
 370                                  struct device_attribute *attr,
 371                                  char *buf)
 372 {
 373         struct rfkill *rfkill = to_rfkill(dev);
 374
 375         return sprintf(buf, "%d", rfkill->user_claim);
 376 }
 377
 378 static ssize_t rfkill_claim_store(struct device *dev,
 379                                   struct device_attribute *attr,
 380                                   const char *buf, size_t count)
 381 {
 382         struct rfkill *rfkill = to_rfkill(dev);
 383         bool claim = !!simple_strtoul(buf, NULL, 0);
 384         int error;
 385
 386         if (!capable(CAP_NET_ADMIN))
 387                 return -EPERM;
 388
 389         if (rfkill->user_claim_unsupported)
 390                 return -EOPNOTSUPP;
 391
 392         /*
 393          * Take the global lock to make sure the kernel is not in
 394          * the middle of rfkill_switch_all
 395          */
 396         error = mutex_lock_interruptible(&rfkill_mutex);
 397         if (error)
 398                 return error;
 399
 400         if (rfkill->user_claim != claim) {
 401                 if (!claim) {
 402                         mutex_lock(&rfkill->mutex);
 403                         rfkill_toggle_radio(rfkill,
 404                                             rfkill_states[rfkill->type],
 405                                             0);
 406                         mutex_unlock(&rfkill->mutex);
 407                 }
 408                 rfkill->user_claim = claim;
 409         }
 410
 411         mutex_unlock(&rfkill_mutex);
 412
 413         return error ? error : count;
 414 }
 415
 416 static struct device_attribute rfkill_dev_attrs[] = {
 417         __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
 418         __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
 419         __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 420         __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
 421         __ATTR_NULL
 422 };
 423
 424 static void rfkill_release(struct device *dev)
 425 {
 426         struct rfkill *rfkill = to_rfkill(dev);
 427
 428         kfree(rfkill);
 429         module_put(THIS_MODULE);
 430 }
 431
 432 #ifdef CONFIG_PM
 433 static int rfkill_suspend(struct device *dev, pm_message_t state)
 434 {
 435         struct rfkill *rfkill = to_rfkill(dev);
 436
 437         if (dev->power.power_state.event != state.event) {
 438                 if (state.event & PM_EVENT_SLEEP) {
 439                         /* Stop transmitter, keep state, no notifies */
 440                         update_rfkill_state(rfkill);
 441
 442                         mutex_lock(&rfkill->mutex);
 443                         rfkill->toggle_radio(rfkill->data,
 444                                                 RFKILL_STATE_SOFT_BLOCKED);
 445                         mutex_unlock(&rfkill->mutex);
 446                 }
 447
 448                 dev->power.power_state = state;
 449         }
 450
 451         return 0;
 452 }
 453
 454 static int rfkill_resume(struct device *dev)
 455 {
 456         struct rfkill *rfkill = to_rfkill(dev);
 457
 458         if (dev->power.power_state.event != PM_EVENT_ON) {
 459                 mutex_lock(&rfkill->mutex);
 460
 461                 /* restore radio state AND notify everybody */
 462                 rfkill_toggle_radio(rfkill, rfkill->state, 1);
 463
 464                 mutex_unlock(&rfkill->mutex);
 465         }
 466
 467         dev->power.power_state = PMSG_ON;
 468         return 0;
 469 }
 470 #else
 471 #define rfkill_suspend NULL
 472 #define rfkill_resume NULL
 473 #endif
 474
 475 static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
 476                                         unsigned long eventid,
 477                                         void *data)
 478 {
 479         struct rfkill *rfkill = (struct rfkill *)data;
 480
 481         switch (eventid) {
 482         case RFKILL_STATE_CHANGED:
 483                 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 484                 break;
 485         default:
 486                 break;
 487         }
 488
 489         return NOTIFY_DONE;
 490 }
 491
 492 static struct notifier_block rfkill_blocking_uevent_nb = {
 493         .notifier_call  = rfkill_blocking_uevent_notifier,
 494         .priority       = 0,
 495 };
 496
 497 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 498 {
 499         struct rfkill *rfkill = to_rfkill(dev);
 500         int error;
 501
 502         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 503         if (error)
 504                 return error;
 505         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 506                                 rfkill_get_type_str(rfkill->type));
 507         if (error)
 508                 return error;
 509         error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
 510         return error;
 511 }
 512
 513 static struct class rfkill_class = {
 514         .name           = "rfkill",
 515         .dev_release    = rfkill_release,
 516         .dev_attrs      = rfkill_dev_attrs,
 517         .suspend        = rfkill_suspend,
 518         .resume         = rfkill_resume,
 519         .dev_uevent     = rfkill_dev_uevent,
 520 };
 521
 522 static int rfkill_add_switch(struct rfkill *rfkill)
 523 {
 524         mutex_lock(&rfkill_mutex);
 525
 526         rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
 527
 528         list_add_tail(&rfkill->node, &rfkill_list);
 529
 530         mutex_unlock(&rfkill_mutex);
 531
 532         return 0;
 533 }
 534
 535 static void rfkill_remove_switch(struct rfkill *rfkill)
 536 {
 537         mutex_lock(&rfkill_mutex);
 538         list_del_init(&rfkill->node);
 539         mutex_unlock(&rfkill_mutex);
 540
 541         mutex_lock(&rfkill->mutex);
 542         rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
 543         mutex_unlock(&rfkill->mutex);
 544 }
 545
 546 /**
 547  * rfkill_allocate - allocate memory for rfkill structure.
 548  * @parent: device that has rf switch on it
 549  * @type: type of the switch (RFKILL_TYPE_*)
 550  *
 551  * This function should be called by the network driver when it needs
 552  * rfkill structure.  Once the structure is allocated the driver should
 553  * finish its initialization by setting the name, private data, enable_radio
 554  * and disable_radio methods and then register it with rfkill_register().
 555  *
 556  * NOTE: If registration fails the structure shoudl be freed by calling
 557  * rfkill_free() otherwise rfkill_unregister() should be used.
 558  */
 559 struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
 560 {
 561         struct rfkill *rfkill;
 562         struct device *dev;
 563
 564         rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
 565         if (!rfkill)
 566                 return NULL;
 567
 568         mutex_init(&rfkill->mutex);
 569         INIT_LIST_HEAD(&rfkill->node);
 570         rfkill->type = type;
 571
 572         dev = &rfkill->dev;
 573         dev->class = &rfkill_class;
 574         dev->parent = parent;
 575         device_initialize(dev);
 576
 577         __module_get(THIS_MODULE);
 578
 579         return rfkill;
 580 }
 581 EXPORT_SYMBOL(rfkill_allocate);
 582
 583 /**
 584  * rfkill_free - Mark rfkill structure for deletion
 585  * @rfkill: rfkill structure to be destroyed
 586  *
 587  * Decrements reference count of the rfkill structure so it is destroyed.
 588  * Note that rfkill_free() should _not_ be called after rfkill_unregister().
 589  */
 590 void rfkill_free(struct rfkill *rfkill)
 591 {
 592         if (rfkill)
 593                 put_device(&rfkill->dev);
 594 }
 595 EXPORT_SYMBOL(rfkill_free);
 596
 597 static void rfkill_led_trigger_register(struct rfkill *rfkill)
 598 {
 599 #ifdef CONFIG_RFKILL_LEDS
 600         int error;
 601
 602         if (!rfkill->led_trigger.name)
 603                 rfkill->led_trigger.name = rfkill->dev.bus_id;
 604         if (!rfkill->led_trigger.activate)
 605                 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 606         error = led_trigger_register(&rfkill->led_trigger);
 607         if (error)
 608                 rfkill->led_trigger.name = NULL;
 609 #endif /* CONFIG_RFKILL_LEDS */
 610 }
 611
 612 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 613 {
 614 #ifdef CONFIG_RFKILL_LEDS
 615         if (rfkill->led_trigger.name) {
 616                 led_trigger_unregister(&rfkill->led_trigger);
 617                 rfkill->led_trigger.name = NULL;
 618         }
 619 #endif
 620 }
 621
 622 /**
 623  * rfkill_register - Register a rfkill structure.
 624  * @rfkill: rfkill structure to be registered
 625  *
 626  * This function should be called by the network driver when the rfkill
 627  * structure needs to be registered. Immediately from registration the
 628  * switch driver should be able to service calls to toggle_radio.
 629  */
 630 int rfkill_register(struct rfkill *rfkill)
 631 {
 632         static atomic_t rfkill_no = ATOMIC_INIT(0);
 633         struct device *dev = &rfkill->dev;
 634         int error;
 635
 636         if (!rfkill->toggle_radio)
 637                 return -EINVAL;
 638         if (rfkill->type >= RFKILL_TYPE_MAX)
 639                 return -EINVAL;
 640
 641         snprintf(dev->bus_id, sizeof(dev->bus_id),
 642                  "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
 643
 644         rfkill_led_trigger_register(rfkill);
 645
 646         error = rfkill_add_switch(rfkill);
 647         if (error) {
 648                 rfkill_led_trigger_unregister(rfkill);
 649                 return error;
 650         }
 651
 652         error = device_add(dev);
 653         if (error) {
 654                 rfkill_remove_switch(rfkill);
 655                 rfkill_led_trigger_unregister(rfkill);
 656                 return error;
 657         }
 658
 659         return 0;
 660 }
 661 EXPORT_SYMBOL(rfkill_register);
 662
 663 /**
 664  * rfkill_unregister - Unregister a rfkill structure.
 665  * @rfkill: rfkill structure to be unregistered
 666  *
 667  * This function should be called by the network driver during device
 668  * teardown to destroy rfkill structure. Note that rfkill_free() should
 669  * _not_ be called after rfkill_unregister().
 670  */
 671 void rfkill_unregister(struct rfkill *rfkill)
 672 {
 673         device_del(&rfkill->dev);
 674         rfkill_remove_switch(rfkill);
 675         rfkill_led_trigger_unregister(rfkill);
 676         put_device(&rfkill->dev);
 677 }
 678 EXPORT_SYMBOL(rfkill_unregister);
 679
 680 /*
 681  * Rfkill module initialization/deinitialization.
 682  */
 683 static int __init rfkill_init(void)
 684 {
 685         int error;
 686         int i;
 687
 688         /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
 689         if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
 690             rfkill_default_state != RFKILL_STATE_UNBLOCKED)
 691                 return -EINVAL;
 692
 693         for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
 694                 rfkill_states[i] = rfkill_default_state;
 695
 696         error = class_register(&rfkill_class);
 697         if (error) {
 698                 printk(KERN_ERR "rfkill: unable to register rfkill class\n");
 699                 return error;
 700         }
 701
 702         register_rfkill_notifier(&rfkill_blocking_uevent_nb);
 703
 704         return 0;
 705 }
 706
 707 static void __exit rfkill_exit(void)
 708 {
 709         unregister_rfkill_notifier(&rfkill_blocking_uevent_nb);
 710         class_unregister(&rfkill_class);
 711 }
 712
 713 subsys_initcall(rfkill_init);
 714 module_exit(rfkill_exit);