net/rfkill/core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2006 - 2007 Ivo van Doorn
   4  * Copyright (C) 2007 Dmitry Torokhov
   5  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/capability.h>
  13 #include <linux/list.h>
  14 #include <linux/mutex.h>
  15 #include <linux/rfkill.h>
  16 #include <linux/sched.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/device.h>
  19 #include <linux/miscdevice.h>
  20 #include <linux/wait.h>
  21 #include <linux/poll.h>
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24
  25 #include "rfkill.h"
  26
  27 #define POLL_INTERVAL           (5 * HZ)
  28
  29 #define RFKILL_BLOCK_HW         BIT(0)
  30 #define RFKILL_BLOCK_SW         BIT(1)
  31 #define RFKILL_BLOCK_SW_PREV    BIT(2)
  32 #define RFKILL_BLOCK_ANY        (RFKILL_BLOCK_HW |\
  33                                  RFKILL_BLOCK_SW |\
  34                                  RFKILL_BLOCK_SW_PREV)
  35 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
  36
  37 struct rfkill {
  38         spinlock_t              lock;
  39
  40         enum rfkill_type        type;
  41
  42         unsigned long           state;
  43
  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 = &rfkill->dev;
1006         int error;
1007
1008         BUG_ON(!rfkill);
1009
1010         mutex_lock(&rfkill_global_mutex);
1011
1012         if (rfkill->registered) {
1013                 error = -EALREADY;
1014                 goto unlock;
1015         }
1016
1017         rfkill->idx = rfkill_no;
1018         dev_set_name(dev, "rfkill%lu", rfkill_no);
1019         rfkill_no++;
1020
1021         list_add_tail(&rfkill->node, &rfkill_list);
1022
1023         error = device_add(dev);
1024         if (error)
1025                 goto remove;
1026
1027         error = rfkill_led_trigger_register(rfkill);
1028         if (error)
1029                 goto devdel;
1030
1031         rfkill->registered = true;
1032
1033         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1034         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1035         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1036
1037         if (rfkill->ops->poll)
1038                 queue_delayed_work(system_power_efficient_wq,
1039                         &rfkill->poll_work,
1040                         round_jiffies_relative(POLL_INTERVAL));
1041
1042         if (!rfkill->persistent || rfkill_epo_lock_active) {
1043                 schedule_work(&rfkill->sync_work);
1044         } else {
1045 #ifdef CONFIG_RFKILL_INPUT
1046                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1047
1048                 if (!atomic_read(&rfkill_input_disabled))
1049                         __rfkill_switch_all(rfkill->type, soft_blocked);
1050 #endif
1051         }
1052
1053         rfkill_global_led_trigger_event();
1054         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1055
1056         mutex_unlock(&rfkill_global_mutex);
1057         return 0;
1058
1059  devdel:
1060         device_del(&rfkill->dev);
1061  remove:
1062         list_del_init(&rfkill->node);
1063  unlock:
1064         mutex_unlock(&rfkill_global_mutex);
1065         return error;
1066 }
1067 EXPORT_SYMBOL(rfkill_register);
1068
1069 void rfkill_unregister(struct rfkill *rfkill)
1070 {
1071         BUG_ON(!rfkill);
1072
1073         if (rfkill->ops->poll)
1074                 cancel_delayed_work_sync(&rfkill->poll_work);
1075
1076         cancel_work_sync(&rfkill->uevent_work);
1077         cancel_work_sync(&rfkill->sync_work);
1078
1079         rfkill->registered = false;
1080
1081         device_del(&rfkill->dev);
1082
1083         mutex_lock(&rfkill_global_mutex);
1084         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1085         list_del_init(&rfkill->node);
1086         rfkill_global_led_trigger_event();
1087         mutex_unlock(&rfkill_global_mutex);
1088
1089         rfkill_led_trigger_unregister(rfkill);
1090 }
1091 EXPORT_SYMBOL(rfkill_unregister);
1092
1093 void rfkill_destroy(struct rfkill *rfkill)
1094 {
1095         if (rfkill)
1096                 put_device(&rfkill->dev);
1097 }
1098 EXPORT_SYMBOL(rfkill_destroy);
1099
1100 static int rfkill_fop_open(struct inode *inode, struct file *file)
1101 {
1102         struct rfkill_data *data;
1103         struct rfkill *rfkill;
1104         struct rfkill_int_event *ev, *tmp;
1105
1106         data = kzalloc(sizeof(*data), GFP_KERNEL);
1107         if (!data)
1108                 return -ENOMEM;
1109
1110         INIT_LIST_HEAD(&data->events);
1111         mutex_init(&data->mtx);
1112         init_waitqueue_head(&data->read_wait);
1113
1114         mutex_lock(&rfkill_global_mutex);
1115         mutex_lock(&data->mtx);
1116         /*
1117          * start getting events from elsewhere but hold mtx to get
1118          * startup events added first
1119          */
1120
1121         list_for_each_entry(rfkill, &rfkill_list, node) {
1122                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1123                 if (!ev)
1124                         goto free;
1125                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1126                 list_add_tail(&ev->list, &data->events);
1127         }
1128         list_add(&data->list, &rfkill_fds);
1129         mutex_unlock(&data->mtx);
1130         mutex_unlock(&rfkill_global_mutex);
1131
1132         file->private_data = data;
1133
1134         return stream_open(inode, file);
1135
1136  free:
1137         mutex_unlock(&data->mtx);
1138         mutex_unlock(&rfkill_global_mutex);
1139         mutex_destroy(&data->mtx);
1140         list_for_each_entry_safe(ev, tmp, &data->events, list)
1141                 kfree(ev);
1142         kfree(data);
1143         return -ENOMEM;
1144 }
1145
1146 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1147 {
1148         struct rfkill_data *data = file->private_data;
1149         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1150
1151         poll_wait(file, &data->read_wait, wait);
1152
1153         mutex_lock(&data->mtx);
1154         if (!list_empty(&data->events))
1155                 res = EPOLLIN | EPOLLRDNORM;
1156         mutex_unlock(&data->mtx);
1157
1158         return res;
1159 }
1160
1161 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1162                                size_t count, loff_t *pos)
1163 {
1164         struct rfkill_data *data = file->private_data;
1165         struct rfkill_int_event *ev;
1166         unsigned long sz;
1167         int ret;
1168
1169         mutex_lock(&data->mtx);
1170
1171         while (list_empty(&data->events)) {
1172                 if (file->f_flags & O_NONBLOCK) {
1173                         ret = -EAGAIN;
1174                         goto out;
1175                 }
1176                 mutex_unlock(&data->mtx);
1177                 /* since we re-check and it just compares pointers,
1178                  * using !list_empty() without locking isn't a problem
1179                  */
1180                 ret = wait_event_interruptible(data->read_wait,
1181                                                !list_empty(&data->events));
1182                 mutex_lock(&data->mtx);
1183
1184                 if (ret)
1185                         goto out;
1186         }
1187
1188         ev = list_first_entry(&data->events, struct rfkill_int_event,
1189                                 list);
1190
1191         sz = min_t(unsigned long, sizeof(ev->ev), count);
1192         ret = sz;
1193         if (copy_to_user(buf, &ev->ev, sz))
1194                 ret = -EFAULT;
1195
1196         list_del(&ev->list);
1197         kfree(ev);
1198  out:
1199         mutex_unlock(&data->mtx);
1200         return ret;
1201 }
1202
1203 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1204                                 size_t count, loff_t *pos)
1205 {
1206         struct rfkill *rfkill;
1207         struct rfkill_event ev;
1208         int ret;
1209
1210         /* we don't need the 'hard' variable but accept it */
1211         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1212                 return -EINVAL;
1213
1214         /*
1215          * Copy as much data as we can accept into our 'ev' buffer,
1216          * but tell userspace how much we've copied so it can determine
1217          * our API version even in a write() call, if it cares.
1218          */
1219         count = min(count, sizeof(ev));
1220         if (copy_from_user(&ev, buf, count))
1221                 return -EFAULT;
1222
1223         if (ev.type >= NUM_RFKILL_TYPES)
1224                 return -EINVAL;
1225
1226         mutex_lock(&rfkill_global_mutex);
1227
1228         switch (ev.op) {
1229         case RFKILL_OP_CHANGE_ALL:
1230                 rfkill_update_global_state(ev.type, ev.soft);
1231                 list_for_each_entry(rfkill, &rfkill_list, node)
1232                         if (rfkill->type == ev.type ||
1233                             ev.type == RFKILL_TYPE_ALL)
1234                                 rfkill_set_block(rfkill, ev.soft);
1235                 ret = 0;
1236                 break;
1237         case RFKILL_OP_CHANGE:
1238                 list_for_each_entry(rfkill, &rfkill_list, node)
1239                         if (rfkill->idx == ev.idx &&
1240                             (rfkill->type == ev.type ||
1241                              ev.type == RFKILL_TYPE_ALL))
1242                                 rfkill_set_block(rfkill, ev.soft);
1243                 ret = 0;
1244                 break;
1245         default:
1246                 ret = -EINVAL;
1247                 break;
1248         }
1249
1250         mutex_unlock(&rfkill_global_mutex);
1251
1252         return ret ?: count;
1253 }
1254
1255 static int rfkill_fop_release(struct inode *inode, struct file *file)
1256 {
1257         struct rfkill_data *data = file->private_data;
1258         struct rfkill_int_event *ev, *tmp;
1259
1260         mutex_lock(&rfkill_global_mutex);
1261         list_del(&data->list);
1262         mutex_unlock(&rfkill_global_mutex);
1263
1264         mutex_destroy(&data->mtx);
1265         list_for_each_entry_safe(ev, tmp, &data->events, list)
1266                 kfree(ev);
1267
1268 #ifdef CONFIG_RFKILL_INPUT
1269         if (data->input_handler)
1270                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1271                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1272 #endif
1273
1274         kfree(data);
1275
1276         return 0;
1277 }
1278
1279 #ifdef CONFIG_RFKILL_INPUT
1280 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1281                              unsigned long arg)
1282 {
1283         struct rfkill_data *data = file->private_data;
1284
1285         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1286                 return -ENOSYS;
1287
1288         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1289                 return -ENOSYS;
1290
1291         mutex_lock(&data->mtx);
1292
1293         if (!data->input_handler) {
1294                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1295                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1296                 data->input_handler = true;
1297         }
1298
1299         mutex_unlock(&data->mtx);
1300
1301         return 0;
1302 }
1303 #endif
1304
1305 static const struct file_operations rfkill_fops = {
1306         .owner          = THIS_MODULE,
1307         .open           = rfkill_fop_open,
1308         .read           = rfkill_fop_read,
1309         .write          = rfkill_fop_write,
1310         .poll           = rfkill_fop_poll,
1311         .release        = rfkill_fop_release,
1312 #ifdef CONFIG_RFKILL_INPUT
1313         .unlocked_ioctl = rfkill_fop_ioctl,
1314         .compat_ioctl   = compat_ptr_ioctl,
1315 #endif
1316         .llseek         = no_llseek,
1317 };
1318
1319 #define RFKILL_NAME "rfkill"
1320
1321 static struct miscdevice rfkill_miscdev = {
1322         .fops   = &rfkill_fops,
1323         .name   = RFKILL_NAME,
1324         .minor  = RFKILL_MINOR,
1325 };
1326
1327 static int __init rfkill_init(void)
1328 {
1329         int error;
1330
1331         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1332
1333         error = class_register(&rfkill_class);
1334         if (error)
1335                 goto error_class;
1336
1337         error = misc_register(&rfkill_miscdev);
1338         if (error)
1339                 goto error_misc;
1340
1341         error = rfkill_global_led_trigger_register();
1342         if (error)
1343                 goto error_led_trigger;
1344
1345 #ifdef CONFIG_RFKILL_INPUT
1346         error = rfkill_handler_init();
1347         if (error)
1348                 goto error_input;
1349 #endif
1350
1351         return 0;
1352
1353 #ifdef CONFIG_RFKILL_INPUT
1354 error_input:
1355         rfkill_global_led_trigger_unregister();
1356 #endif
1357 error_led_trigger:
1358         misc_deregister(&rfkill_miscdev);
1359 error_misc:
1360         class_unregister(&rfkill_class);
1361 error_class:
1362         return error;
1363 }
1364 subsys_initcall(rfkill_init);
1365
1366 static void __exit rfkill_exit(void)
1367 {
1368 #ifdef CONFIG_RFKILL_INPUT
1369         rfkill_handler_exit();
1370 #endif
1371         rfkill_global_led_trigger_unregister();
1372         misc_deregister(&rfkill_miscdev);
1373         class_unregister(&rfkill_class);
1374 }
1375 module_exit(rfkill_exit);
1376
1377 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1378 MODULE_ALIAS("devname:" RFKILL_NAME);