net/rfkill/core.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
rfkill_led_trigger_event
rfkill_led_trigger_activate
rfkill_get_led_trigger_name
rfkill_set_led_trigger_name
rfkill_led_trigger_register
rfkill_led_trigger_unregister
rfkill_global_led_trigger_worker
rfkill_global_led_trigger_event
rfkill_global_led_trigger_register
rfkill_global_led_trigger_unregister
rfkill_led_trigger_event
rfkill_led_trigger_register
rfkill_led_trigger_unregister
rfkill_global_led_trigger_event
rfkill_global_led_trigger_register
rfkill_global_led_trigger_unregister
rfkill_fill_event
rfkill_send_events
rfkill_event
rfkill_set_block
rfkill_update_global_state
__rfkill_switch_all
rfkill_switch_all
rfkill_epo
rfkill_restore_states
rfkill_remove_epo_lock
rfkill_is_epo_lock_active
rfkill_get_global_sw_state
rfkill_set_hw_state
__rfkill_set_sw_state
rfkill_set_sw_state
rfkill_init_sw_state
rfkill_set_states
rfkill_find_type
name_show
type_show
index_show
persistent_show
hard_show
soft_show
soft_store
user_state_from_blocked
state_show
state_store
rfkill_release
rfkill_dev_uevent
rfkill_pause_polling
rfkill_resume_polling
rfkill_suspend
rfkill_resume
rfkill_blocked
rfkill_alloc
rfkill_poll
rfkill_uevent_work
rfkill_sync_work
rfkill_register
rfkill_unregister
rfkill_destroy
rfkill_fop_open
rfkill_fop_poll
rfkill_fop_read
rfkill_fop_write
rfkill_fop_release
rfkill_fop_ioctl
rfkill_init
rfkill_exit
   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 
  44         u32                     idx;
  45 
  46         bool                    registered;
  47         bool                    persistent;
  48         bool                    polling_paused;
  49         bool                    suspended;
  50 
  51         const struct rfkill_ops *ops;
  52         void                    *data;
  53 
  54 #ifdef CONFIG_RFKILL_LEDS
  55         struct led_trigger      led_trigger;
  56         const char              *ledtrigname;
  57 #endif
  58 
  59         struct device           dev;
  60         struct list_head        node;
  61 
  62         struct delayed_work     poll_work;
  63         struct work_struct      uevent_work;
  64         struct work_struct      sync_work;
  65         char                    name[];
  66 };
  67 #define to_rfkill(d)    container_of(d, struct rfkill, dev)
  68 
  69 struct rfkill_int_event {
  70         struct list_head        list;
  71         struct rfkill_event     ev;
  72 };
  73 
  74 struct rfkill_data {
  75         struct list_head        list;
  76         struct list_head        events;
  77         struct mutex            mtx;
  78         wait_queue_head_t       read_wait;
  79         bool                    input_handler;
  80 };
  81 
  82 
  83 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  84 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  85 MODULE_DESCRIPTION("RF switch support");
  86 MODULE_LICENSE("GPL");
  87 
  88 
  89 /*
  90  * The locking here should be made much smarter, we currently have
  91  * a bit of a stupid situation because drivers might want to register
  92  * the rfkill struct under their own lock, and take this lock during
  93  * rfkill method calls -- which will cause an AB-BA deadlock situation.
  94  *
  95  * To fix that, we need to rework this code here to be mostly lock-free
  96  * and only use the mutex for list manipulations, not to protect the
  97  * various other global variables. Then we can avoid holding the mutex
  98  * around driver operations, and all is happy.
  99  */
 100 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 101 static DEFINE_MUTEX(rfkill_global_mutex);
 102 static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 103 
 104 static unsigned int rfkill_default_state = 1;
 105 module_param_named(default_state, rfkill_default_state, uint, 0444);
 106 MODULE_PARM_DESC(default_state,
 107                  "Default initial state for all radio types, 0 = radio off");
 108 
 109 static struct {
 110         bool cur, sav;
 111 } rfkill_global_states[NUM_RFKILL_TYPES];
 112 
 113 static bool rfkill_epo_lock_active;
 114 
 115 
 116 #ifdef CONFIG_RFKILL_LEDS
 117 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 118 {
 119         struct led_trigger *trigger;
 120 
 121         if (!rfkill->registered)
 122                 return;
 123 
 124         trigger = &rfkill->led_trigger;
 125 
 126         if (rfkill->state & RFKILL_BLOCK_ANY)
 127                 led_trigger_event(trigger, LED_OFF);
 128         else
 129                 led_trigger_event(trigger, LED_FULL);
 130 }
 131 
 132 static int rfkill_led_trigger_activate(struct led_classdev *led)
 133 {
 134         struct rfkill *rfkill;
 135 
 136         rfkill = container_of(led->trigger, struct rfkill, led_trigger);
 137 
 138         rfkill_led_trigger_event(rfkill);
 139 
 140         return 0;
 141 }
 142 
 143 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 144 {
 145         return rfkill->led_trigger.name;
 146 }
 147 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 148 
 149 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 150 {
 151         BUG_ON(!rfkill);
 152 
 153         rfkill->ledtrigname = name;
 154 }
 155 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 156 
 157 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 158 {
 159         rfkill->led_trigger.name = rfkill->ledtrigname
 160                                         ? : dev_name(&rfkill->dev);
 161         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 162         return led_trigger_register(&rfkill->led_trigger);
 163 }
 164 
 165 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 166 {
 167         led_trigger_unregister(&rfkill->led_trigger);
 168 }
 169 
 170 static struct led_trigger rfkill_any_led_trigger;
 171 static struct led_trigger rfkill_none_led_trigger;
 172 static struct work_struct rfkill_global_led_trigger_work;
 173 
 174 static void rfkill_global_led_trigger_worker(struct work_struct *work)
 175 {
 176         enum led_brightness brightness = LED_OFF;
 177         struct rfkill *rfkill;
 178 
 179         mutex_lock(&rfkill_global_mutex);
 180         list_for_each_entry(rfkill, &rfkill_list, node) {
 181                 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
 182                         brightness = LED_FULL;
 183                         break;
 184                 }
 185         }
 186         mutex_unlock(&rfkill_global_mutex);
 187 
 188         led_trigger_event(&rfkill_any_led_trigger, brightness);
 189         led_trigger_event(&rfkill_none_led_trigger,
 190                           brightness == LED_OFF ? LED_FULL : LED_OFF);
 191 }
 192 
 193 static void rfkill_global_led_trigger_event(void)
 194 {
 195         schedule_work(&rfkill_global_led_trigger_work);
 196 }
 197 
 198 static int rfkill_global_led_trigger_register(void)
 199 {
 200         int ret;
 201 
 202         INIT_WORK(&rfkill_global_led_trigger_work,
 203                         rfkill_global_led_trigger_worker);
 204 
 205         rfkill_any_led_trigger.name = "rfkill-any";
 206         ret = led_trigger_register(&rfkill_any_led_trigger);
 207         if (ret)
 208                 return ret;
 209 
 210         rfkill_none_led_trigger.name = "rfkill-none";
 211         ret = led_trigger_register(&rfkill_none_led_trigger);
 212         if (ret)
 213                 led_trigger_unregister(&rfkill_any_led_trigger);
 214         else
 215                 /* Delay activation until all global triggers are registered */
 216                 rfkill_global_led_trigger_event();
 217 
 218         return ret;
 219 }
 220 
 221 static void rfkill_global_led_trigger_unregister(void)
 222 {
 223         led_trigger_unregister(&rfkill_none_led_trigger);
 224         led_trigger_unregister(&rfkill_any_led_trigger);
 225         cancel_work_sync(&rfkill_global_led_trigger_work);
 226 }
 227 #else
 228 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 229 {
 230 }
 231 
 232 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 233 {
 234         return 0;
 235 }
 236 
 237 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 238 {
 239 }
 240 
 241 static void rfkill_global_led_trigger_event(void)
 242 {
 243 }
 244 
 245 static int rfkill_global_led_trigger_register(void)
 246 {
 247         return 0;
 248 }
 249 
 250 static void rfkill_global_led_trigger_unregister(void)
 251 {
 252 }
 253 #endif /* CONFIG_RFKILL_LEDS */
 254 
 255 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
 256                               enum rfkill_operation op)
 257 {
 258         unsigned long flags;
 259 
 260         ev->idx = rfkill->idx;
 261         ev->type = rfkill->type;
 262         ev->op = op;
 263 
 264         spin_lock_irqsave(&rfkill->lock, flags);
 265         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 266         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 267                                         RFKILL_BLOCK_SW_PREV));
 268         spin_unlock_irqrestore(&rfkill->lock, flags);
 269 }
 270 
 271 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 272 {
 273         struct rfkill_data *data;
 274         struct rfkill_int_event *ev;
 275 
 276         list_for_each_entry(data, &rfkill_fds, list) {
 277                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 278                 if (!ev)
 279                         continue;
 280                 rfkill_fill_event(&ev->ev, rfkill, op);
 281                 mutex_lock(&data->mtx);
 282                 list_add_tail(&ev->list, &data->events);
 283                 mutex_unlock(&data->mtx);
 284                 wake_up_interruptible(&data->read_wait);
 285         }
 286 }
 287 
 288 static void rfkill_event(struct rfkill *rfkill)
 289 {
 290         if (!rfkill->registered)
 291                 return;
 292 
 293         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 294 
 295         /* also send event to /dev/rfkill */
 296         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 297 }
 298 
 299 /**
 300  * rfkill_set_block - wrapper for set_block method
 301  *
 302  * @rfkill: the rfkill struct to use
 303  * @blocked: the new software state
 304  *
 305  * Calls the set_block method (when applicable) and handles notifications
 306  * etc. as well.
 307  */
 308 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 309 {
 310         unsigned long flags;
 311         bool prev, curr;
 312         int err;
 313 
 314         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 315                 return;
 316 
 317         /*
 318          * Some platforms (...!) generate input events which affect the
 319          * _hard_ kill state -- whenever something tries to change the
 320          * current software state query the hardware state too.
 321          */
 322         if (rfkill->ops->query)
 323                 rfkill->ops->query(rfkill, rfkill->data);
 324 
 325         spin_lock_irqsave(&rfkill->lock, flags);
 326         prev = rfkill->state & RFKILL_BLOCK_SW;
 327 
 328         if (prev)
 329                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 330         else
 331                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 332 
 333         if (blocked)
 334                 rfkill->state |= RFKILL_BLOCK_SW;
 335         else
 336                 rfkill->state &= ~RFKILL_BLOCK_SW;
 337 
 338         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 339         spin_unlock_irqrestore(&rfkill->lock, flags);
 340 
 341         err = rfkill->ops->set_block(rfkill->data, blocked);
 342 
 343         spin_lock_irqsave(&rfkill->lock, flags);
 344         if (err) {
 345                 /*
 346                  * Failed -- reset status to _PREV, which may be different
 347                  * from what we have set _PREV to earlier in this function
 348                  * if rfkill_set_sw_state was invoked.
 349                  */
 350                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 351                         rfkill->state |= RFKILL_BLOCK_SW;
 352                 else
 353                         rfkill->state &= ~RFKILL_BLOCK_SW;
 354         }
 355         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 356         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 357         curr = rfkill->state & RFKILL_BLOCK_SW;
 358         spin_unlock_irqrestore(&rfkill->lock, flags);
 359 
 360         rfkill_led_trigger_event(rfkill);
 361         rfkill_global_led_trigger_event();
 362 
 363         if (prev != curr)
 364                 rfkill_event(rfkill);
 365 }
 366 
 367 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 368 {
 369         int i;
 370 
 371         if (type != RFKILL_TYPE_ALL) {
 372                 rfkill_global_states[type].cur = blocked;
 373                 return;
 374         }
 375 
 376         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 377                 rfkill_global_states[i].cur = blocked;
 378 }
 379 
 380 #ifdef CONFIG_RFKILL_INPUT
 381 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 382 
 383 /**
 384  * __rfkill_switch_all - Toggle state of all switches of given type
 385  * @type: type of interfaces to be affected
 386  * @blocked: the new state
 387  *
 388  * This function sets the state of all switches of given type,
 389  * unless a specific switch is suspended.
 390  *
 391  * Caller must have acquired rfkill_global_mutex.
 392  */
 393 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 394 {
 395         struct rfkill *rfkill;
 396 
 397         rfkill_update_global_state(type, blocked);
 398         list_for_each_entry(rfkill, &rfkill_list, node) {
 399                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 400                         continue;
 401 
 402                 rfkill_set_block(rfkill, blocked);
 403         }
 404 }
 405 
 406 /**
 407  * rfkill_switch_all - Toggle state of all switches of given type
 408  * @type: type of interfaces to be affected
 409  * @blocked: the new state
 410  *
 411  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 412  * Please refer to __rfkill_switch_all() for details.
 413  *
 414  * Does nothing if the EPO lock is active.
 415  */
 416 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 417 {
 418         if (atomic_read(&rfkill_input_disabled))
 419                 return;
 420 
 421         mutex_lock(&rfkill_global_mutex);
 422 
 423         if (!rfkill_epo_lock_active)
 424                 __rfkill_switch_all(type, blocked);
 425 
 426         mutex_unlock(&rfkill_global_mutex);
 427 }
 428 
 429 /**
 430  * rfkill_epo - emergency power off all transmitters
 431  *
 432  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 433  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 434  *
 435  * The global state before the EPO is saved and can be restored later
 436  * using rfkill_restore_states().
 437  */
 438 void rfkill_epo(void)
 439 {
 440         struct rfkill *rfkill;
 441         int i;
 442 
 443         if (atomic_read(&rfkill_input_disabled))
 444                 return;
 445 
 446         mutex_lock(&rfkill_global_mutex);
 447 
 448         rfkill_epo_lock_active = true;
 449         list_for_each_entry(rfkill, &rfkill_list, node)
 450                 rfkill_set_block(rfkill, true);
 451 
 452         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 453                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 454                 rfkill_global_states[i].cur = true;
 455         }
 456 
 457         mutex_unlock(&rfkill_global_mutex);
 458 }
 459 
 460 /**
 461  * rfkill_restore_states - restore global states
 462  *
 463  * Restore (and sync switches to) the global state from the
 464  * states in rfkill_default_states.  This can undo the effects of
 465  * a call to rfkill_epo().
 466  */
 467 void rfkill_restore_states(void)
 468 {
 469         int i;
 470 
 471         if (atomic_read(&rfkill_input_disabled))
 472                 return;
 473 
 474         mutex_lock(&rfkill_global_mutex);
 475 
 476         rfkill_epo_lock_active = false;
 477         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 478                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 479         mutex_unlock(&rfkill_global_mutex);
 480 }
 481 
 482 /**
 483  * rfkill_remove_epo_lock - unlock state changes
 484  *
 485  * Used by rfkill-input manually unlock state changes, when
 486  * the EPO switch is deactivated.
 487  */
 488 void rfkill_remove_epo_lock(void)
 489 {
 490         if (atomic_read(&rfkill_input_disabled))
 491                 return;
 492 
 493         mutex_lock(&rfkill_global_mutex);
 494         rfkill_epo_lock_active = false;
 495         mutex_unlock(&rfkill_global_mutex);
 496 }
 497 
 498 /**
 499  * rfkill_is_epo_lock_active - returns true EPO is active
 500  *
 501  * Returns 0 (false) if there is NOT an active EPO condition,
 502  * and 1 (true) if there is an active EPO condition, which
 503  * locks all radios in one of the BLOCKED states.
 504  *
 505  * Can be called in atomic context.
 506  */
 507 bool rfkill_is_epo_lock_active(void)
 508 {
 509         return rfkill_epo_lock_active;
 510 }
 511 
 512 /**
 513  * rfkill_get_global_sw_state - returns global state for a type
 514  * @type: the type to get the global state of
 515  *
 516  * Returns the current global state for a given wireless
 517  * device type.
 518  */
 519 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 520 {
 521         return rfkill_global_states[type].cur;
 522 }
 523 #endif
 524 
 525 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 526 {
 527         unsigned long flags;
 528         bool ret, prev;
 529 
 530         BUG_ON(!rfkill);
 531 
 532         spin_lock_irqsave(&rfkill->lock, flags);
 533         prev = !!(rfkill->state & RFKILL_BLOCK_HW);
 534         if (blocked)
 535                 rfkill->state |= RFKILL_BLOCK_HW;
 536         else
 537                 rfkill->state &= ~RFKILL_BLOCK_HW;
 538         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 539         spin_unlock_irqrestore(&rfkill->lock, flags);
 540 
 541         rfkill_led_trigger_event(rfkill);
 542         rfkill_global_led_trigger_event();
 543 
 544         if (rfkill->registered && prev != blocked)
 545                 schedule_work(&rfkill->uevent_work);
 546 
 547         return ret;
 548 }
 549 EXPORT_SYMBOL(rfkill_set_hw_state);
 550 
 551 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 552 {
 553         u32 bit = RFKILL_BLOCK_SW;
 554 
 555         /* if in a ops->set_block right now, use other bit */
 556         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 557                 bit = RFKILL_BLOCK_SW_PREV;
 558 
 559         if (blocked)
 560                 rfkill->state |= bit;
 561         else
 562                 rfkill->state &= ~bit;
 563 }
 564 
 565 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 566 {
 567         unsigned long flags;
 568         bool prev, hwblock;
 569 
 570         BUG_ON(!rfkill);
 571 
 572         spin_lock_irqsave(&rfkill->lock, flags);
 573         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 574         __rfkill_set_sw_state(rfkill, blocked);
 575         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 576         blocked = blocked || hwblock;
 577         spin_unlock_irqrestore(&rfkill->lock, flags);
 578 
 579         if (!rfkill->registered)
 580                 return blocked;
 581 
 582         if (prev != blocked && !hwblock)
 583                 schedule_work(&rfkill->uevent_work);
 584 
 585         rfkill_led_trigger_event(rfkill);
 586         rfkill_global_led_trigger_event();
 587 
 588         return blocked;
 589 }
 590 EXPORT_SYMBOL(rfkill_set_sw_state);
 591 
 592 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 593 {
 594         unsigned long flags;
 595 
 596         BUG_ON(!rfkill);
 597         BUG_ON(rfkill->registered);
 598 
 599         spin_lock_irqsave(&rfkill->lock, flags);
 600         __rfkill_set_sw_state(rfkill, blocked);
 601         rfkill->persistent = true;
 602         spin_unlock_irqrestore(&rfkill->lock, flags);
 603 }
 604 EXPORT_SYMBOL(rfkill_init_sw_state);
 605 
 606 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 607 {
 608         unsigned long flags;
 609         bool swprev, hwprev;
 610 
 611         BUG_ON(!rfkill);
 612 
 613         spin_lock_irqsave(&rfkill->lock, flags);
 614 
 615         /*
 616          * No need to care about prev/setblock ... this is for uevent only
 617          * and that will get triggered by rfkill_set_block anyway.
 618          */
 619         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 620         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 621         __rfkill_set_sw_state(rfkill, sw);
 622         if (hw)
 623                 rfkill->state |= RFKILL_BLOCK_HW;
 624         else
 625                 rfkill->state &= ~RFKILL_BLOCK_HW;
 626 
 627         spin_unlock_irqrestore(&rfkill->lock, flags);
 628 
 629         if (!rfkill->registered) {
 630                 rfkill->persistent = true;
 631         } else {
 632                 if (swprev != sw || hwprev != hw)
 633                         schedule_work(&rfkill->uevent_work);
 634 
 635                 rfkill_led_trigger_event(rfkill);
 636                 rfkill_global_led_trigger_event();
 637         }
 638 }
 639 EXPORT_SYMBOL(rfkill_set_states);
 640 
 641 static const char * const rfkill_types[] = {
 642         NULL, /* RFKILL_TYPE_ALL */
 643         "wlan",
 644         "bluetooth",
 645         "ultrawideband",
 646         "wimax",
 647         "wwan",
 648         "gps",
 649         "fm",
 650         "nfc",
 651 };
 652 
 653 enum rfkill_type rfkill_find_type(const char *name)
 654 {
 655         int i;
 656 
 657         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 658 
 659         if (!name)
 660                 return RFKILL_TYPE_ALL;
 661 
 662         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 663                 if (!strcmp(name, rfkill_types[i]))
 664                         return i;
 665         return RFKILL_TYPE_ALL;
 666 }
 667 EXPORT_SYMBOL(rfkill_find_type);
 668 
 669 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 670                          char *buf)
 671 {
 672         struct rfkill *rfkill = to_rfkill(dev);
 673 
 674         return sprintf(buf, "%s\n", rfkill->name);
 675 }
 676 static DEVICE_ATTR_RO(name);
 677 
 678 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 679                          char *buf)
 680 {
 681         struct rfkill *rfkill = to_rfkill(dev);
 682 
 683         return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
 684 }
 685 static DEVICE_ATTR_RO(type);
 686 
 687 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 688                           char *buf)
 689 {
 690         struct rfkill *rfkill = to_rfkill(dev);
 691 
 692         return sprintf(buf, "%d\n", rfkill->idx);
 693 }
 694 static DEVICE_ATTR_RO(index);
 695 
 696 static ssize_t persistent_show(struct device *dev,
 697                                struct device_attribute *attr, char *buf)
 698 {
 699         struct rfkill *rfkill = to_rfkill(dev);
 700 
 701         return sprintf(buf, "%d\n", rfkill->persistent);
 702 }
 703 static DEVICE_ATTR_RO(persistent);
 704 
 705 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 706                          char *buf)
 707 {
 708         struct rfkill *rfkill = to_rfkill(dev);
 709 
 710         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 711 }
 712 static DEVICE_ATTR_RO(hard);
 713 
 714 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 715                          char *buf)
 716 {
 717         struct rfkill *rfkill = to_rfkill(dev);
 718 
 719         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 720 }
 721 
 722 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 723                           const char *buf, size_t count)
 724 {
 725         struct rfkill *rfkill = to_rfkill(dev);
 726         unsigned long state;
 727         int err;
 728 
 729         if (!capable(CAP_NET_ADMIN))
 730                 return -EPERM;
 731 
 732         err = kstrtoul(buf, 0, &state);
 733         if (err)
 734                 return err;
 735 
 736         if (state > 1 )
 737                 return -EINVAL;
 738 
 739         mutex_lock(&rfkill_global_mutex);
 740         rfkill_set_block(rfkill, state);
 741         mutex_unlock(&rfkill_global_mutex);
 742 
 743         return count;
 744 }
 745 static DEVICE_ATTR_RW(soft);
 746 
 747 static u8 user_state_from_blocked(unsigned long state)
 748 {
 749         if (state & RFKILL_BLOCK_HW)
 750                 return RFKILL_USER_STATE_HARD_BLOCKED;
 751         if (state & RFKILL_BLOCK_SW)
 752                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 753 
 754         return RFKILL_USER_STATE_UNBLOCKED;
 755 }
 756 
 757 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 758                           char *buf)
 759 {
 760         struct rfkill *rfkill = to_rfkill(dev);
 761 
 762         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 763 }
 764 
 765 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 766                            const char *buf, size_t count)
 767 {
 768         struct rfkill *rfkill = to_rfkill(dev);
 769         unsigned long state;
 770         int err;
 771 
 772         if (!capable(CAP_NET_ADMIN))
 773                 return -EPERM;
 774 
 775         err = kstrtoul(buf, 0, &state);
 776         if (err)
 777                 return err;
 778 
 779         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 780             state != RFKILL_USER_STATE_UNBLOCKED)
 781                 return -EINVAL;
 782 
 783         mutex_lock(&rfkill_global_mutex);
 784         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 785         mutex_unlock(&rfkill_global_mutex);
 786 
 787         return count;
 788 }
 789 static DEVICE_ATTR_RW(state);
 790 
 791 static struct attribute *rfkill_dev_attrs[] = {
 792         &dev_attr_name.attr,
 793         &dev_attr_type.attr,
 794         &dev_attr_index.attr,
 795         &dev_attr_persistent.attr,
 796         &dev_attr_state.attr,
 797         &dev_attr_soft.attr,
 798         &dev_attr_hard.attr,
 799         NULL,
 800 };
 801 ATTRIBUTE_GROUPS(rfkill_dev);
 802 
 803 static void rfkill_release(struct device *dev)
 804 {
 805         struct rfkill *rfkill = to_rfkill(dev);
 806 
 807         kfree(rfkill);
 808 }
 809 
 810 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 811 {
 812         struct rfkill *rfkill = to_rfkill(dev);
 813         unsigned long flags;
 814         u32 state;
 815         int error;
 816 
 817         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 818         if (error)
 819                 return error;
 820         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 821                                rfkill_types[rfkill->type]);
 822         if (error)
 823                 return error;
 824         spin_lock_irqsave(&rfkill->lock, flags);
 825         state = rfkill->state;
 826         spin_unlock_irqrestore(&rfkill->lock, flags);
 827         error = add_uevent_var(env, "RFKILL_STATE=%d",
 828                                user_state_from_blocked(state));
 829         return error;
 830 }
 831 
 832 void rfkill_pause_polling(struct rfkill *rfkill)
 833 {
 834         BUG_ON(!rfkill);
 835 
 836         if (!rfkill->ops->poll)
 837                 return;
 838 
 839         rfkill->polling_paused = true;
 840         cancel_delayed_work_sync(&rfkill->poll_work);
 841 }
 842 EXPORT_SYMBOL(rfkill_pause_polling);
 843 
 844 void rfkill_resume_polling(struct rfkill *rfkill)
 845 {
 846         BUG_ON(!rfkill);
 847 
 848         if (!rfkill->ops->poll)
 849                 return;
 850 
 851         rfkill->polling_paused = false;
 852 
 853         if (rfkill->suspended)
 854                 return;
 855 
 856         queue_delayed_work(system_power_efficient_wq,
 857                            &rfkill->poll_work, 0);
 858 }
 859 EXPORT_SYMBOL(rfkill_resume_polling);
 860 
 861 #ifdef CONFIG_PM_SLEEP
 862 static int rfkill_suspend(struct device *dev)
 863 {
 864         struct rfkill *rfkill = to_rfkill(dev);
 865 
 866         rfkill->suspended = true;
 867         cancel_delayed_work_sync(&rfkill->poll_work);
 868 
 869         return 0;
 870 }
 871 
 872 static int rfkill_resume(struct device *dev)
 873 {
 874         struct rfkill *rfkill = to_rfkill(dev);
 875         bool cur;
 876 
 877         rfkill->suspended = false;
 878 
 879         if (!rfkill->persistent) {
 880                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 881                 rfkill_set_block(rfkill, cur);
 882         }
 883 
 884         if (rfkill->ops->poll && !rfkill->polling_paused)
 885                 queue_delayed_work(system_power_efficient_wq,
 886                                    &rfkill->poll_work, 0);
 887 
 888         return 0;
 889 }
 890 
 891 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 892 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 893 #else
 894 #define RFKILL_PM_OPS NULL
 895 #endif
 896 
 897 static struct class rfkill_class = {
 898         .name           = "rfkill",
 899         .dev_release    = rfkill_release,
 900         .dev_groups     = rfkill_dev_groups,
 901         .dev_uevent     = rfkill_dev_uevent,
 902         .pm             = RFKILL_PM_OPS,
 903 };
 904 
 905 bool rfkill_blocked(struct rfkill *rfkill)
 906 {
 907         unsigned long flags;
 908         u32 state;
 909 
 910         spin_lock_irqsave(&rfkill->lock, flags);
 911         state = rfkill->state;
 912         spin_unlock_irqrestore(&rfkill->lock, flags);
 913 
 914         return !!(state & RFKILL_BLOCK_ANY);
 915 }
 916 EXPORT_SYMBOL(rfkill_blocked);
 917 
 918 
 919 struct rfkill * __must_check rfkill_alloc(const char *name,
 920                                           struct device *parent,
 921                                           const enum rfkill_type type,
 922                                           const struct rfkill_ops *ops,
 923                                           void *ops_data)
 924 {
 925         struct rfkill *rfkill;
 926         struct device *dev;
 927 
 928         if (WARN_ON(!ops))
 929                 return NULL;
 930 
 931         if (WARN_ON(!ops->set_block))
 932                 return NULL;
 933 
 934         if (WARN_ON(!name))
 935                 return NULL;
 936 
 937         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 938                 return NULL;
 939 
 940         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 941         if (!rfkill)
 942                 return NULL;
 943 
 944         spin_lock_init(&rfkill->lock);
 945         INIT_LIST_HEAD(&rfkill->node);
 946         rfkill->type = type;
 947         strcpy(rfkill->name, name);
 948         rfkill->ops = ops;
 949         rfkill->data = ops_data;
 950 
 951         dev = &rfkill->dev;
 952         dev->class = &rfkill_class;
 953         dev->parent = parent;
 954         device_initialize(dev);
 955 
 956         return rfkill;
 957 }
 958 EXPORT_SYMBOL(rfkill_alloc);
 959 
 960 static void rfkill_poll(struct work_struct *work)
 961 {
 962         struct rfkill *rfkill;
 963 
 964         rfkill = container_of(work, struct rfkill, poll_work.work);
 965 
 966         /*
 967          * Poll hardware state -- driver will use one of the
 968          * rfkill_set{,_hw,_sw}_state functions and use its
 969          * return value to update the current status.
 970          */
 971         rfkill->ops->poll(rfkill, rfkill->data);
 972 
 973         queue_delayed_work(system_power_efficient_wq,
 974                 &rfkill->poll_work,
 975                 round_jiffies_relative(POLL_INTERVAL));
 976 }
 977 
 978 static void rfkill_uevent_work(struct work_struct *work)
 979 {
 980         struct rfkill *rfkill;
 981 
 982         rfkill = container_of(work, struct rfkill, uevent_work);
 983 
 984         mutex_lock(&rfkill_global_mutex);
 985         rfkill_event(rfkill);
 986         mutex_unlock(&rfkill_global_mutex);
 987 }
 988 
 989 static void rfkill_sync_work(struct work_struct *work)
 990 {
 991         struct rfkill *rfkill;
 992         bool cur;
 993 
 994         rfkill = container_of(work, struct rfkill, sync_work);
 995 
 996         mutex_lock(&rfkill_global_mutex);
 997         cur = rfkill_global_states[rfkill->type].cur;
 998         rfkill_set_block(rfkill, cur);
 999         mutex_unlock(&rfkill_global_mutex);
1000 }
1001 
1002 int __must_check rfkill_register(struct rfkill *rfkill)
1003 {
1004         static unsigned long rfkill_no;
1005         struct device *dev;
1006         int error;
1007 
1008         if (!rfkill)
1009                 return -EINVAL;
1010 
1011         dev = &rfkill->dev;
1012 
1013         mutex_lock(&rfkill_global_mutex);
1014 
1015         if (rfkill->registered) {
1016                 error = -EALREADY;
1017                 goto unlock;
1018         }
1019 
1020         rfkill->idx = rfkill_no;
1021         dev_set_name(dev, "rfkill%lu", rfkill_no);
1022         rfkill_no++;
1023 
1024         list_add_tail(&rfkill->node, &rfkill_list);
1025 
1026         error = device_add(dev);
1027         if (error)
1028                 goto remove;
1029 
1030         error = rfkill_led_trigger_register(rfkill);
1031         if (error)
1032                 goto devdel;
1033 
1034         rfkill->registered = true;
1035 
1036         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1037         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1038         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1039 
1040         if (rfkill->ops->poll)
1041                 queue_delayed_work(system_power_efficient_wq,
1042                         &rfkill->poll_work,
1043                         round_jiffies_relative(POLL_INTERVAL));
1044 
1045         if (!rfkill->persistent || rfkill_epo_lock_active) {
1046                 schedule_work(&rfkill->sync_work);
1047         } else {
1048 #ifdef CONFIG_RFKILL_INPUT
1049                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1050 
1051                 if (!atomic_read(&rfkill_input_disabled))
1052                         __rfkill_switch_all(rfkill->type, soft_blocked);
1053 #endif
1054         }
1055 
1056         rfkill_global_led_trigger_event();
1057         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1058 
1059         mutex_unlock(&rfkill_global_mutex);
1060         return 0;
1061 
1062  devdel:
1063         device_del(&rfkill->dev);
1064  remove:
1065         list_del_init(&rfkill->node);
1066  unlock:
1067         mutex_unlock(&rfkill_global_mutex);
1068         return error;
1069 }
1070 EXPORT_SYMBOL(rfkill_register);
1071 
1072 void rfkill_unregister(struct rfkill *rfkill)
1073 {
1074         BUG_ON(!rfkill);
1075 
1076         if (rfkill->ops->poll)
1077                 cancel_delayed_work_sync(&rfkill->poll_work);
1078 
1079         cancel_work_sync(&rfkill->uevent_work);
1080         cancel_work_sync(&rfkill->sync_work);
1081 
1082         rfkill->registered = false;
1083 
1084         device_del(&rfkill->dev);
1085 
1086         mutex_lock(&rfkill_global_mutex);
1087         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1088         list_del_init(&rfkill->node);
1089         rfkill_global_led_trigger_event();
1090         mutex_unlock(&rfkill_global_mutex);
1091 
1092         rfkill_led_trigger_unregister(rfkill);
1093 }
1094 EXPORT_SYMBOL(rfkill_unregister);
1095 
1096 void rfkill_destroy(struct rfkill *rfkill)
1097 {
1098         if (rfkill)
1099                 put_device(&rfkill->dev);
1100 }
1101 EXPORT_SYMBOL(rfkill_destroy);
1102 
1103 static int rfkill_fop_open(struct inode *inode, struct file *file)
1104 {
1105         struct rfkill_data *data;
1106         struct rfkill *rfkill;
1107         struct rfkill_int_event *ev, *tmp;
1108 
1109         data = kzalloc(sizeof(*data), GFP_KERNEL);
1110         if (!data)
1111                 return -ENOMEM;
1112 
1113         INIT_LIST_HEAD(&data->events);
1114         mutex_init(&data->mtx);
1115         init_waitqueue_head(&data->read_wait);
1116 
1117         mutex_lock(&rfkill_global_mutex);
1118         mutex_lock(&data->mtx);
1119         /*
1120          * start getting events from elsewhere but hold mtx to get
1121          * startup events added first
1122          */
1123 
1124         list_for_each_entry(rfkill, &rfkill_list, node) {
1125                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1126                 if (!ev)
1127                         goto free;
1128                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1129                 list_add_tail(&ev->list, &data->events);
1130         }
1131         list_add(&data->list, &rfkill_fds);
1132         mutex_unlock(&data->mtx);
1133         mutex_unlock(&rfkill_global_mutex);
1134 
1135         file->private_data = data;
1136 
1137         return stream_open(inode, file);
1138 
1139  free:
1140         mutex_unlock(&data->mtx);
1141         mutex_unlock(&rfkill_global_mutex);
1142         mutex_destroy(&data->mtx);
1143         list_for_each_entry_safe(ev, tmp, &data->events, list)
1144                 kfree(ev);
1145         kfree(data);
1146         return -ENOMEM;
1147 }
1148 
1149 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1150 {
1151         struct rfkill_data *data = file->private_data;
1152         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1153 
1154         poll_wait(file, &data->read_wait, wait);
1155 
1156         mutex_lock(&data->mtx);
1157         if (!list_empty(&data->events))
1158                 res = EPOLLIN | EPOLLRDNORM;
1159         mutex_unlock(&data->mtx);
1160 
1161         return res;
1162 }
1163 
1164 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1165                                size_t count, loff_t *pos)
1166 {
1167         struct rfkill_data *data = file->private_data;
1168         struct rfkill_int_event *ev;
1169         unsigned long sz;
1170         int ret;
1171 
1172         mutex_lock(&data->mtx);
1173 
1174         while (list_empty(&data->events)) {
1175                 if (file->f_flags & O_NONBLOCK) {
1176                         ret = -EAGAIN;
1177                         goto out;
1178                 }
1179                 mutex_unlock(&data->mtx);
1180                 /* since we re-check and it just compares pointers,
1181                  * using !list_empty() without locking isn't a problem
1182                  */
1183                 ret = wait_event_interruptible(data->read_wait,
1184                                                !list_empty(&data->events));
1185                 mutex_lock(&data->mtx);
1186 
1187                 if (ret)
1188                         goto out;
1189         }
1190 
1191         ev = list_first_entry(&data->events, struct rfkill_int_event,
1192                                 list);
1193 
1194         sz = min_t(unsigned long, sizeof(ev->ev), count);
1195         ret = sz;
1196         if (copy_to_user(buf, &ev->ev, sz))
1197                 ret = -EFAULT;
1198 
1199         list_del(&ev->list);
1200         kfree(ev);
1201  out:
1202         mutex_unlock(&data->mtx);
1203         return ret;
1204 }
1205 
1206 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1207                                 size_t count, loff_t *pos)
1208 {
1209         struct rfkill *rfkill;
1210         struct rfkill_event ev;
1211         int ret;
1212 
1213         /* we don't need the 'hard' variable but accept it */
1214         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1215                 return -EINVAL;
1216 
1217         /*
1218          * Copy as much data as we can accept into our 'ev' buffer,
1219          * but tell userspace how much we've copied so it can determine
1220          * our API version even in a write() call, if it cares.
1221          */
1222         count = min(count, sizeof(ev));
1223         if (copy_from_user(&ev, buf, count))
1224                 return -EFAULT;
1225 
1226         if (ev.type >= NUM_RFKILL_TYPES)
1227                 return -EINVAL;
1228 
1229         mutex_lock(&rfkill_global_mutex);
1230 
1231         switch (ev.op) {
1232         case RFKILL_OP_CHANGE_ALL:
1233                 rfkill_update_global_state(ev.type, ev.soft);
1234                 list_for_each_entry(rfkill, &rfkill_list, node)
1235                         if (rfkill->type == ev.type ||
1236                             ev.type == RFKILL_TYPE_ALL)
1237                                 rfkill_set_block(rfkill, ev.soft);
1238                 ret = 0;
1239                 break;
1240         case RFKILL_OP_CHANGE:
1241                 list_for_each_entry(rfkill, &rfkill_list, node)
1242                         if (rfkill->idx == ev.idx &&
1243                             (rfkill->type == ev.type ||
1244                              ev.type == RFKILL_TYPE_ALL))
1245                                 rfkill_set_block(rfkill, ev.soft);
1246                 ret = 0;
1247                 break;
1248         default:
1249                 ret = -EINVAL;
1250                 break;
1251         }
1252 
1253         mutex_unlock(&rfkill_global_mutex);
1254 
1255         return ret ?: count;
1256 }
1257 
1258 static int rfkill_fop_release(struct inode *inode, struct file *file)
1259 {
1260         struct rfkill_data *data = file->private_data;
1261         struct rfkill_int_event *ev, *tmp;
1262 
1263         mutex_lock(&rfkill_global_mutex);
1264         list_del(&data->list);
1265         mutex_unlock(&rfkill_global_mutex);
1266 
1267         mutex_destroy(&data->mtx);
1268         list_for_each_entry_safe(ev, tmp, &data->events, list)
1269                 kfree(ev);
1270 
1271 #ifdef CONFIG_RFKILL_INPUT
1272         if (data->input_handler)
1273                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1274                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1275 #endif
1276 
1277         kfree(data);
1278 
1279         return 0;
1280 }
1281 
1282 #ifdef CONFIG_RFKILL_INPUT
1283 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1284                              unsigned long arg)
1285 {
1286         struct rfkill_data *data = file->private_data;
1287 
1288         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1289                 return -ENOSYS;
1290 
1291         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1292                 return -ENOSYS;
1293 
1294         mutex_lock(&data->mtx);
1295 
1296         if (!data->input_handler) {
1297                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1298                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1299                 data->input_handler = true;
1300         }
1301 
1302         mutex_unlock(&data->mtx);
1303 
1304         return 0;
1305 }
1306 #endif
1307 
1308 static const struct file_operations rfkill_fops = {
1309         .owner          = THIS_MODULE,
1310         .open           = rfkill_fop_open,
1311         .read           = rfkill_fop_read,
1312         .write          = rfkill_fop_write,
1313         .poll           = rfkill_fop_poll,
1314         .release        = rfkill_fop_release,
1315 #ifdef CONFIG_RFKILL_INPUT
1316         .unlocked_ioctl = rfkill_fop_ioctl,
1317         .compat_ioctl   = rfkill_fop_ioctl,
1318 #endif
1319         .llseek         = no_llseek,
1320 };
1321 
1322 #define RFKILL_NAME "rfkill"
1323 
1324 static struct miscdevice rfkill_miscdev = {
1325         .fops   = &rfkill_fops,
1326         .name   = RFKILL_NAME,
1327         .minor  = RFKILL_MINOR,
1328 };
1329 
1330 static int __init rfkill_init(void)
1331 {
1332         int error;
1333 
1334         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1335 
1336         error = class_register(&rfkill_class);
1337         if (error)
1338                 goto error_class;
1339 
1340         error = misc_register(&rfkill_miscdev);
1341         if (error)
1342                 goto error_misc;
1343 
1344         error = rfkill_global_led_trigger_register();
1345         if (error)
1346                 goto error_led_trigger;
1347 
1348 #ifdef CONFIG_RFKILL_INPUT
1349         error = rfkill_handler_init();
1350         if (error)
1351                 goto error_input;
1352 #endif
1353 
1354         return 0;
1355 
1356 #ifdef CONFIG_RFKILL_INPUT
1357 error_input:
1358         rfkill_global_led_trigger_unregister();
1359 #endif
1360 error_led_trigger:
1361         misc_deregister(&rfkill_miscdev);
1362 error_misc:
1363         class_unregister(&rfkill_class);
1364 error_class:
1365         return error;
1366 }
1367 subsys_initcall(rfkill_init);
1368 
1369 static void __exit rfkill_exit(void)
1370 {
1371 #ifdef CONFIG_RFKILL_INPUT
1372         rfkill_handler_exit();
1373 #endif
1374         rfkill_global_led_trigger_unregister();
1375         misc_deregister(&rfkill_miscdev);
1376         class_unregister(&rfkill_class);
1377 }
1378 module_exit(rfkill_exit);
1379 
1380 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1381 MODULE_ALIAS("devname:" RFKILL_NAME);
/* [<][>][^][v][top][bottom][index][help] */
root/net/rfkill/core.c

DEFINITIONS
