net/rfkill/core.c

   1 /*
   2  * Copyright (C) 2006 - 2007 Ivo van Doorn
   3  * Copyright (C) 2007 Dmitry Torokhov
   4  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/capability.h>
  25 #include <linux/list.h>
  26 #include <linux/mutex.h>
  27 #include <linux/rfkill.h>
  28 #include <linux/sched.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/device.h>
  31 #include <linux/miscdevice.h>
  32 #include <linux/wait.h>
  33 #include <linux/poll.h>
  34 #include <linux/fs.h>
  35 #include <linux/slab.h>
  36
  37 #include "rfkill.h"
  38
  39 #define POLL_INTERVAL           (5 * HZ)
  40
  41 #define RFKILL_BLOCK_HW         BIT(0)
  42 #define RFKILL_BLOCK_SW         BIT(1)
  43 #define RFKILL_BLOCK_SW_PREV    BIT(2)
  44 #define RFKILL_BLOCK_ANY        (RFKILL_BLOCK_HW |\
  45                                  RFKILL_BLOCK_SW |\
  46                                  RFKILL_BLOCK_SW_PREV)
  47 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
  48
  49 struct rfkill {
  50         spinlock_t              lock;
  51
  52         enum rfkill_type        type;
  53
  54         unsigned long           state;
  55
  56         u32                     idx;
  57
  58         bool                    registered;
  59         bool                    persistent;
  60         bool                    polling_paused;
  61         bool                    suspended;
  62
  63         const struct rfkill_ops *ops;
  64         void                    *data;
  65
  66 #ifdef CONFIG_RFKILL_LEDS
  67         struct led_trigger      led_trigger;
  68         const char              *ledtrigname;
  69 #endif
  70
  71         struct device           dev;
  72         struct list_head        node;
  73
  74         struct delayed_work     poll_work;
  75         struct work_struct      uevent_work;
  76         struct work_struct      sync_work;
  77         char                    name[];
  78 };
  79 #define to_rfkill(d)    container_of(d, struct rfkill, dev)
  80
  81 struct rfkill_int_event {
  82         struct list_head        list;
  83         struct rfkill_event     ev;
  84 };
  85
  86 struct rfkill_data {
  87         struct list_head        list;
  88         struct list_head        events;
  89         struct mutex            mtx;
  90         wait_queue_head_t       read_wait;
  91         bool                    input_handler;
  92 };
  93
  94
  95 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  96 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  97 MODULE_DESCRIPTION("RF switch support");
  98 MODULE_LICENSE("GPL");
  99
 100
 101 /*
 102  * The locking here should be made much smarter, we currently have
 103  * a bit of a stupid situation because drivers might want to register
 104  * the rfkill struct under their own lock, and take this lock during
 105  * rfkill method calls -- which will cause an AB-BA deadlock situation.
 106  *
 107  * To fix that, we need to rework this code here to be mostly lock-free
 108  * and only use the mutex for list manipulations, not to protect the
 109  * various other global variables. Then we can avoid holding the mutex
 110  * around driver operations, and all is happy.
 111  */
 112 static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 113 static DEFINE_MUTEX(rfkill_global_mutex);
 114 static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 115
 116 static unsigned int rfkill_default_state = 1;
 117 module_param_named(default_state, rfkill_default_state, uint, 0444);
 118 MODULE_PARM_DESC(default_state,
 119                  "Default initial state for all radio types, 0 = radio off");
 120
 121 static struct {
 122         bool cur, sav;
 123 } rfkill_global_states[NUM_RFKILL_TYPES];
 124
 125 static bool rfkill_epo_lock_active;
 126
 127
 128 #ifdef CONFIG_RFKILL_LEDS
 129 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 130 {
 131         struct led_trigger *trigger;
 132
 133         if (!rfkill->registered)
 134                 return;
 135
 136         trigger = &rfkill->led_trigger;
 137
 138         if (rfkill->state & RFKILL_BLOCK_ANY)
 139                 led_trigger_event(trigger, LED_OFF);
 140         else
 141                 led_trigger_event(trigger, LED_FULL);
 142 }
 143
 144 static void rfkill_led_trigger_activate(struct led_classdev *led)
 145 {
 146         struct rfkill *rfkill;
 147
 148         rfkill = container_of(led->trigger, struct rfkill, led_trigger);
 149
 150         rfkill_led_trigger_event(rfkill);
 151 }
 152
 153 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 154 {
 155         return rfkill->led_trigger.name;
 156 }
 157 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 158
 159 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 160 {
 161         BUG_ON(!rfkill);
 162
 163         rfkill->ledtrigname = name;
 164 }
 165 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 166
 167 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 168 {
 169         rfkill->led_trigger.name = rfkill->ledtrigname
 170                                         ? : dev_name(&rfkill->dev);
 171         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 172         return led_trigger_register(&rfkill->led_trigger);
 173 }
 174
 175 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 176 {
 177         led_trigger_unregister(&rfkill->led_trigger);
 178 }
 179
 180 static struct led_trigger rfkill_any_led_trigger;
 181 static struct work_struct rfkill_any_work;
 182
 183 static void rfkill_any_led_trigger_worker(struct work_struct *work)
 184 {
 185         enum led_brightness brightness = LED_OFF;
 186         struct rfkill *rfkill;
 187
 188         mutex_lock(&rfkill_global_mutex);
 189         list_for_each_entry(rfkill, &rfkill_list, node) {
 190                 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
 191                         brightness = LED_FULL;
 192                         break;
 193                 }
 194         }
 195         mutex_unlock(&rfkill_global_mutex);
 196
 197         led_trigger_event(&rfkill_any_led_trigger, brightness);
 198 }
 199
 200 static void rfkill_any_led_trigger_event(void)
 201 {
 202         schedule_work(&rfkill_any_work);
 203 }
 204
 205 static void rfkill_any_led_trigger_activate(struct led_classdev *led_cdev)
 206 {
 207         rfkill_any_led_trigger_event();
 208 }
 209
 210 static int rfkill_any_led_trigger_register(void)
 211 {
 212         INIT_WORK(&rfkill_any_work, rfkill_any_led_trigger_worker);
 213         rfkill_any_led_trigger.name = "rfkill-any";
 214         rfkill_any_led_trigger.activate = rfkill_any_led_trigger_activate;
 215         return led_trigger_register(&rfkill_any_led_trigger);
 216 }
 217
 218 static void rfkill_any_led_trigger_unregister(void)
 219 {
 220         led_trigger_unregister(&rfkill_any_led_trigger);
 221         cancel_work_sync(&rfkill_any_work);
 222 }
 223 #else
 224 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 225 {
 226 }
 227
 228 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 229 {
 230         return 0;
 231 }
 232
 233 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 234 {
 235 }
 236
 237 static void rfkill_any_led_trigger_event(void)
 238 {
 239 }
 240
 241 static int rfkill_any_led_trigger_register(void)
 242 {
 243         return 0;
 244 }
 245
 246 static void rfkill_any_led_trigger_unregister(void)
 247 {
 248 }
 249 #endif /* CONFIG_RFKILL_LEDS */
 250
 251 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
 252                               enum rfkill_operation op)
 253 {
 254         unsigned long flags;
 255
 256         ev->idx = rfkill->idx;
 257         ev->type = rfkill->type;
 258         ev->op = op;
 259
 260         spin_lock_irqsave(&rfkill->lock, flags);
 261         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 262         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 263                                         RFKILL_BLOCK_SW_PREV));
 264         spin_unlock_irqrestore(&rfkill->lock, flags);
 265 }
 266
 267 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 268 {
 269         struct rfkill_data *data;
 270         struct rfkill_int_event *ev;
 271
 272         list_for_each_entry(data, &rfkill_fds, list) {
 273                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 274                 if (!ev)
 275                         continue;
 276                 rfkill_fill_event(&ev->ev, rfkill, op);
 277                 mutex_lock(&data->mtx);
 278                 list_add_tail(&ev->list, &data->events);
 279                 mutex_unlock(&data->mtx);
 280                 wake_up_interruptible(&data->read_wait);
 281         }
 282 }
 283
 284 static void rfkill_event(struct rfkill *rfkill)
 285 {
 286         if (!rfkill->registered)
 287                 return;
 288
 289         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 290
 291         /* also send event to /dev/rfkill */
 292         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 293 }
 294
 295 /**
 296  * rfkill_set_block - wrapper for set_block method
 297  *
 298  * @rfkill: the rfkill struct to use
 299  * @blocked: the new software state
 300  *
 301  * Calls the set_block method (when applicable) and handles notifications
 302  * etc. as well.
 303  */
 304 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 305 {
 306         unsigned long flags;
 307         bool prev, curr;
 308         int err;
 309
 310         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 311                 return;
 312
 313         /*
 314          * Some platforms (...!) generate input events which affect the
 315          * _hard_ kill state -- whenever something tries to change the
 316          * current software state query the hardware state too.
 317          */
 318         if (rfkill->ops->query)
 319                 rfkill->ops->query(rfkill, rfkill->data);
 320
 321         spin_lock_irqsave(&rfkill->lock, flags);
 322         prev = rfkill->state & RFKILL_BLOCK_SW;
 323
 324         if (prev)
 325                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 326         else
 327                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 328
 329         if (blocked)
 330                 rfkill->state |= RFKILL_BLOCK_SW;
 331         else
 332                 rfkill->state &= ~RFKILL_BLOCK_SW;
 333
 334         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 335         spin_unlock_irqrestore(&rfkill->lock, flags);
 336
 337         err = rfkill->ops->set_block(rfkill->data, blocked);
 338
 339         spin_lock_irqsave(&rfkill->lock, flags);
 340         if (err) {
 341                 /*
 342                  * Failed -- reset status to _PREV, which may be different
 343                  * from what we have set _PREV to earlier in this function
 344                  * if rfkill_set_sw_state was invoked.
 345                  */
 346                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 347                         rfkill->state |= RFKILL_BLOCK_SW;
 348                 else
 349                         rfkill->state &= ~RFKILL_BLOCK_SW;
 350         }
 351         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 352         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 353         curr = rfkill->state & RFKILL_BLOCK_SW;
 354         spin_unlock_irqrestore(&rfkill->lock, flags);
 355
 356         rfkill_led_trigger_event(rfkill);
 357         rfkill_any_led_trigger_event();
 358
 359         if (prev != curr)
 360                 rfkill_event(rfkill);
 361 }
 362
 363 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
 364 {
 365         int i;
 366
 367         if (type != RFKILL_TYPE_ALL) {
 368                 rfkill_global_states[type].cur = blocked;
 369                 return;
 370         }
 371
 372         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 373                 rfkill_global_states[i].cur = blocked;
 374 }
 375
 376 #ifdef CONFIG_RFKILL_INPUT
 377 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 378
 379 /**
 380  * __rfkill_switch_all - Toggle state of all switches of given type
 381  * @type: type of interfaces to be affected
 382  * @blocked: the new state
 383  *
 384  * This function sets the state of all switches of given type,
 385  * unless a specific switch is suspended.
 386  *
 387  * Caller must have acquired rfkill_global_mutex.
 388  */
 389 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 390 {
 391         struct rfkill *rfkill;
 392
 393         rfkill_update_global_state(type, blocked);
 394         list_for_each_entry(rfkill, &rfkill_list, node) {
 395                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
 396                         continue;
 397
 398                 rfkill_set_block(rfkill, blocked);
 399         }
 400 }
 401
 402 /**
 403  * rfkill_switch_all - Toggle state of all switches of given type
 404  * @type: type of interfaces to be affected
 405  * @blocked: the new state
 406  *
 407  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 408  * Please refer to __rfkill_switch_all() for details.
 409  *
 410  * Does nothing if the EPO lock is active.
 411  */
 412 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 413 {
 414         if (atomic_read(&rfkill_input_disabled))
 415                 return;
 416
 417         mutex_lock(&rfkill_global_mutex);
 418
 419         if (!rfkill_epo_lock_active)
 420                 __rfkill_switch_all(type, blocked);
 421
 422         mutex_unlock(&rfkill_global_mutex);
 423 }
 424
 425 /**
 426  * rfkill_epo - emergency power off all transmitters
 427  *
 428  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 429  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 430  *
 431  * The global state before the EPO is saved and can be restored later
 432  * using rfkill_restore_states().
 433  */
 434 void rfkill_epo(void)
 435 {
 436         struct rfkill *rfkill;
 437         int i;
 438
 439         if (atomic_read(&rfkill_input_disabled))
 440                 return;
 441
 442         mutex_lock(&rfkill_global_mutex);
 443
 444         rfkill_epo_lock_active = true;
 445         list_for_each_entry(rfkill, &rfkill_list, node)
 446                 rfkill_set_block(rfkill, true);
 447
 448         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 449                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 450                 rfkill_global_states[i].cur = true;
 451         }
 452
 453         mutex_unlock(&rfkill_global_mutex);
 454 }
 455
 456 /**
 457  * rfkill_restore_states - restore global states
 458  *
 459  * Restore (and sync switches to) the global state from the
 460  * states in rfkill_default_states.  This can undo the effects of
 461  * a call to rfkill_epo().
 462  */
 463 void rfkill_restore_states(void)
 464 {
 465         int i;
 466
 467         if (atomic_read(&rfkill_input_disabled))
 468                 return;
 469
 470         mutex_lock(&rfkill_global_mutex);
 471
 472         rfkill_epo_lock_active = false;
 473         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 474                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 475         mutex_unlock(&rfkill_global_mutex);
 476 }
 477
 478 /**
 479  * rfkill_remove_epo_lock - unlock state changes
 480  *
 481  * Used by rfkill-input manually unlock state changes, when
 482  * the EPO switch is deactivated.
 483  */
 484 void rfkill_remove_epo_lock(void)
 485 {
 486         if (atomic_read(&rfkill_input_disabled))
 487                 return;
 488
 489         mutex_lock(&rfkill_global_mutex);
 490         rfkill_epo_lock_active = false;
 491         mutex_unlock(&rfkill_global_mutex);
 492 }
 493
 494 /**
 495  * rfkill_is_epo_lock_active - returns true EPO is active
 496  *
 497  * Returns 0 (false) if there is NOT an active EPO contidion,
 498  * and 1 (true) if there is an active EPO contition, which
 499  * locks all radios in one of the BLOCKED states.
 500  *
 501  * Can be called in atomic context.
 502  */
 503 bool rfkill_is_epo_lock_active(void)
 504 {
 505         return rfkill_epo_lock_active;
 506 }
 507
 508 /**
 509  * rfkill_get_global_sw_state - returns global state for a type
 510  * @type: the type to get the global state of
 511  *
 512  * Returns the current global state for a given wireless
 513  * device type.
 514  */
 515 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 516 {
 517         return rfkill_global_states[type].cur;
 518 }
 519 #endif
 520
 521 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 522 {
 523         unsigned long flags;
 524         bool ret, prev;
 525
 526         BUG_ON(!rfkill);
 527
 528         spin_lock_irqsave(&rfkill->lock, flags);
 529         prev = !!(rfkill->state & RFKILL_BLOCK_HW);
 530         if (blocked)
 531                 rfkill->state |= RFKILL_BLOCK_HW;
 532         else
 533                 rfkill->state &= ~RFKILL_BLOCK_HW;
 534         ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
 535         spin_unlock_irqrestore(&rfkill->lock, flags);
 536
 537         rfkill_led_trigger_event(rfkill);
 538         rfkill_any_led_trigger_event();
 539
 540         if (rfkill->registered && prev != blocked)
 541                 schedule_work(&rfkill->uevent_work);
 542
 543         return ret;
 544 }
 545 EXPORT_SYMBOL(rfkill_set_hw_state);
 546
 547 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 548 {
 549         u32 bit = RFKILL_BLOCK_SW;
 550
 551         /* if in a ops->set_block right now, use other bit */
 552         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 553                 bit = RFKILL_BLOCK_SW_PREV;
 554
 555         if (blocked)
 556                 rfkill->state |= bit;
 557         else
 558                 rfkill->state &= ~bit;
 559 }
 560
 561 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 562 {
 563         unsigned long flags;
 564         bool prev, hwblock;
 565
 566         BUG_ON(!rfkill);
 567
 568         spin_lock_irqsave(&rfkill->lock, flags);
 569         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 570         __rfkill_set_sw_state(rfkill, blocked);
 571         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 572         blocked = blocked || hwblock;
 573         spin_unlock_irqrestore(&rfkill->lock, flags);
 574
 575         if (!rfkill->registered)
 576                 return blocked;
 577
 578         if (prev != blocked && !hwblock)
 579                 schedule_work(&rfkill->uevent_work);
 580
 581         rfkill_led_trigger_event(rfkill);
 582         rfkill_any_led_trigger_event();
 583
 584         return blocked;
 585 }
 586 EXPORT_SYMBOL(rfkill_set_sw_state);
 587
 588 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 589 {
 590         unsigned long flags;
 591
 592         BUG_ON(!rfkill);
 593         BUG_ON(rfkill->registered);
 594
 595         spin_lock_irqsave(&rfkill->lock, flags);
 596         __rfkill_set_sw_state(rfkill, blocked);
 597         rfkill->persistent = true;
 598         spin_unlock_irqrestore(&rfkill->lock, flags);
 599 }
 600 EXPORT_SYMBOL(rfkill_init_sw_state);
 601
 602 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 603 {
 604         unsigned long flags;
 605         bool swprev, hwprev;
 606
 607         BUG_ON(!rfkill);
 608
 609         spin_lock_irqsave(&rfkill->lock, flags);
 610
 611         /*
 612          * No need to care about prev/setblock ... this is for uevent only
 613          * and that will get triggered by rfkill_set_block anyway.
 614          */
 615         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 616         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 617         __rfkill_set_sw_state(rfkill, sw);
 618         if (hw)
 619                 rfkill->state |= RFKILL_BLOCK_HW;
 620         else
 621                 rfkill->state &= ~RFKILL_BLOCK_HW;
 622
 623         spin_unlock_irqrestore(&rfkill->lock, flags);
 624
 625         if (!rfkill->registered) {
 626                 rfkill->persistent = true;
 627         } else {
 628                 if (swprev != sw || hwprev != hw)
 629                         schedule_work(&rfkill->uevent_work);
 630
 631                 rfkill_led_trigger_event(rfkill);
 632                 rfkill_any_led_trigger_event();
 633         }
 634 }
 635 EXPORT_SYMBOL(rfkill_set_states);
 636
 637 static const char * const rfkill_types[] = {
 638         NULL, /* RFKILL_TYPE_ALL */
 639         "wlan",
 640         "bluetooth",
 641         "ultrawideband",
 642         "wimax",
 643         "wwan",
 644         "gps",
 645         "fm",
 646         "nfc",
 647 };
 648
 649 enum rfkill_type rfkill_find_type(const char *name)
 650 {
 651         int i;
 652
 653         BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
 654
 655         if (!name)
 656                 return RFKILL_TYPE_ALL;
 657
 658         for (i = 1; i < NUM_RFKILL_TYPES; i++)
 659                 if (!strcmp(name, rfkill_types[i]))
 660                         return i;
 661         return RFKILL_TYPE_ALL;
 662 }
 663 EXPORT_SYMBOL(rfkill_find_type);
 664
 665 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 666                          char *buf)
 667 {
 668         struct rfkill *rfkill = to_rfkill(dev);
 669
 670         return sprintf(buf, "%s\n", rfkill->name);
 671 }
 672 static DEVICE_ATTR_RO(name);
 673
 674 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 675                          char *buf)
 676 {
 677         struct rfkill *rfkill = to_rfkill(dev);
 678
 679         return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
 680 }
 681 static DEVICE_ATTR_RO(type);
 682
 683 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
 684                           char *buf)
 685 {
 686         struct rfkill *rfkill = to_rfkill(dev);
 687
 688         return sprintf(buf, "%d\n", rfkill->idx);
 689 }
 690 static DEVICE_ATTR_RO(index);
 691
 692 static ssize_t persistent_show(struct device *dev,
 693                                struct device_attribute *attr, char *buf)
 694 {
 695         struct rfkill *rfkill = to_rfkill(dev);
 696
 697         return sprintf(buf, "%d\n", rfkill->persistent);
 698 }
 699 static DEVICE_ATTR_RO(persistent);
 700
 701 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
 702                          char *buf)
 703 {
 704         struct rfkill *rfkill = to_rfkill(dev);
 705
 706         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 707 }
 708 static DEVICE_ATTR_RO(hard);
 709
 710 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
 711                          char *buf)
 712 {
 713         struct rfkill *rfkill = to_rfkill(dev);
 714
 715         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 716 }
 717
 718 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
 719                           const char *buf, size_t count)
 720 {
 721         struct rfkill *rfkill = to_rfkill(dev);
 722         unsigned long state;
 723         int err;
 724
 725         if (!capable(CAP_NET_ADMIN))
 726                 return -EPERM;
 727
 728         err = kstrtoul(buf, 0, &state);
 729         if (err)
 730                 return err;
 731
 732         if (state > 1 )
 733                 return -EINVAL;
 734
 735         mutex_lock(&rfkill_global_mutex);
 736         rfkill_set_block(rfkill, state);
 737         mutex_unlock(&rfkill_global_mutex);
 738
 739         return count;
 740 }
 741 static DEVICE_ATTR_RW(soft);
 742
 743 static u8 user_state_from_blocked(unsigned long state)
 744 {
 745         if (state & RFKILL_BLOCK_HW)
 746                 return RFKILL_USER_STATE_HARD_BLOCKED;
 747         if (state & RFKILL_BLOCK_SW)
 748                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 749
 750         return RFKILL_USER_STATE_UNBLOCKED;
 751 }
 752
 753 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 754                           char *buf)
 755 {
 756         struct rfkill *rfkill = to_rfkill(dev);
 757
 758         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 759 }
 760
 761 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
 762                            const char *buf, size_t count)
 763 {
 764         struct rfkill *rfkill = to_rfkill(dev);
 765         unsigned long state;
 766         int err;
 767
 768         if (!capable(CAP_NET_ADMIN))
 769                 return -EPERM;
 770
 771         err = kstrtoul(buf, 0, &state);
 772         if (err)
 773                 return err;
 774
 775         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 776             state != RFKILL_USER_STATE_UNBLOCKED)
 777                 return -EINVAL;
 778
 779         mutex_lock(&rfkill_global_mutex);
 780         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 781         mutex_unlock(&rfkill_global_mutex);
 782
 783         return count;
 784 }
 785 static DEVICE_ATTR_RW(state);
 786
 787 static struct attribute *rfkill_dev_attrs[] = {
 788         &dev_attr_name.attr,
 789         &dev_attr_type.attr,
 790         &dev_attr_index.attr,
 791         &dev_attr_persistent.attr,
 792         &dev_attr_state.attr,
 793         &dev_attr_soft.attr,
 794         &dev_attr_hard.attr,
 795         NULL,
 796 };
 797 ATTRIBUTE_GROUPS(rfkill_dev);
 798
 799 static void rfkill_release(struct device *dev)
 800 {
 801         struct rfkill *rfkill = to_rfkill(dev);
 802
 803         kfree(rfkill);
 804 }
 805
 806 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 807 {
 808         struct rfkill *rfkill = to_rfkill(dev);
 809         unsigned long flags;
 810         u32 state;
 811         int error;
 812
 813         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 814         if (error)
 815                 return error;
 816         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 817                                rfkill_types[rfkill->type]);
 818         if (error)
 819                 return error;
 820         spin_lock_irqsave(&rfkill->lock, flags);
 821         state = rfkill->state;
 822         spin_unlock_irqrestore(&rfkill->lock, flags);
 823         error = add_uevent_var(env, "RFKILL_STATE=%d",
 824                                user_state_from_blocked(state));
 825         return error;
 826 }
 827
 828 void rfkill_pause_polling(struct rfkill *rfkill)
 829 {
 830         BUG_ON(!rfkill);
 831
 832         if (!rfkill->ops->poll)
 833                 return;
 834
 835         rfkill->polling_paused = true;
 836         cancel_delayed_work_sync(&rfkill->poll_work);
 837 }
 838 EXPORT_SYMBOL(rfkill_pause_polling);
 839
 840 void rfkill_resume_polling(struct rfkill *rfkill)
 841 {
 842         BUG_ON(!rfkill);
 843
 844         if (!rfkill->ops->poll)
 845                 return;
 846
 847         rfkill->polling_paused = false;
 848
 849         if (rfkill->suspended)
 850                 return;
 851
 852         queue_delayed_work(system_power_efficient_wq,
 853                            &rfkill->poll_work, 0);
 854 }
 855 EXPORT_SYMBOL(rfkill_resume_polling);
 856
 857 #ifdef CONFIG_PM_SLEEP
 858 static int rfkill_suspend(struct device *dev)
 859 {
 860         struct rfkill *rfkill = to_rfkill(dev);
 861
 862         rfkill->suspended = true;
 863         cancel_delayed_work_sync(&rfkill->poll_work);
 864
 865         return 0;
 866 }
 867
 868 static int rfkill_resume(struct device *dev)
 869 {
 870         struct rfkill *rfkill = to_rfkill(dev);
 871         bool cur;
 872
 873         rfkill->suspended = false;
 874
 875         if (!rfkill->persistent) {
 876                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 877                 rfkill_set_block(rfkill, cur);
 878         }
 879
 880         if (rfkill->ops->poll && !rfkill->polling_paused)
 881                 queue_delayed_work(system_power_efficient_wq,
 882                                    &rfkill->poll_work, 0);
 883
 884         return 0;
 885 }
 886
 887 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
 888 #define RFKILL_PM_OPS (&rfkill_pm_ops)
 889 #else
 890 #define RFKILL_PM_OPS NULL
 891 #endif
 892
 893 static struct class rfkill_class = {
 894         .name           = "rfkill",
 895         .dev_release    = rfkill_release,
 896         .dev_groups     = rfkill_dev_groups,
 897         .dev_uevent     = rfkill_dev_uevent,
 898         .pm             = RFKILL_PM_OPS,
 899 };
 900
 901 bool rfkill_blocked(struct rfkill *rfkill)
 902 {
 903         unsigned long flags;
 904         u32 state;
 905
 906         spin_lock_irqsave(&rfkill->lock, flags);
 907         state = rfkill->state;
 908         spin_unlock_irqrestore(&rfkill->lock, flags);
 909
 910         return !!(state & RFKILL_BLOCK_ANY);
 911 }
 912 EXPORT_SYMBOL(rfkill_blocked);
 913
 914
 915 struct rfkill * __must_check rfkill_alloc(const char *name,
 916                                           struct device *parent,
 917                                           const enum rfkill_type type,
 918                                           const struct rfkill_ops *ops,
 919                                           void *ops_data)
 920 {
 921         struct rfkill *rfkill;
 922         struct device *dev;
 923
 924         if (WARN_ON(!ops))
 925                 return NULL;
 926
 927         if (WARN_ON(!ops->set_block))
 928                 return NULL;
 929
 930         if (WARN_ON(!name))
 931                 return NULL;
 932
 933         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 934                 return NULL;
 935
 936         rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 937         if (!rfkill)
 938                 return NULL;
 939
 940         spin_lock_init(&rfkill->lock);
 941         INIT_LIST_HEAD(&rfkill->node);
 942         rfkill->type = type;
 943         strcpy(rfkill->name, name);
 944         rfkill->ops = ops;
 945         rfkill->data = ops_data;
 946
 947         dev = &rfkill->dev;
 948         dev->class = &rfkill_class;
 949         dev->parent = parent;
 950         device_initialize(dev);
 951
 952         return rfkill;
 953 }
 954 EXPORT_SYMBOL(rfkill_alloc);
 955
 956 static void rfkill_poll(struct work_struct *work)
 957 {
 958         struct rfkill *rfkill;
 959
 960         rfkill = container_of(work, struct rfkill, poll_work.work);
 961
 962         /*
 963          * Poll hardware state -- driver will use one of the
 964          * rfkill_set{,_hw,_sw}_state functions and use its
 965          * return value to update the current status.
 966          */
 967         rfkill->ops->poll(rfkill, rfkill->data);
 968
 969         queue_delayed_work(system_power_efficient_wq,
 970                 &rfkill->poll_work,
 971                 round_jiffies_relative(POLL_INTERVAL));
 972 }
 973
 974 static void rfkill_uevent_work(struct work_struct *work)
 975 {
 976         struct rfkill *rfkill;
 977
 978         rfkill = container_of(work, struct rfkill, uevent_work);
 979
 980         mutex_lock(&rfkill_global_mutex);
 981         rfkill_event(rfkill);
 982         mutex_unlock(&rfkill_global_mutex);
 983 }
 984
 985 static void rfkill_sync_work(struct work_struct *work)
 986 {
 987         struct rfkill *rfkill;
 988         bool cur;
 989
 990         rfkill = container_of(work, struct rfkill, sync_work);
 991
 992         mutex_lock(&rfkill_global_mutex);
 993         cur = rfkill_global_states[rfkill->type].cur;
 994         rfkill_set_block(rfkill, cur);
 995         mutex_unlock(&rfkill_global_mutex);
 996 }
 997
 998 int __must_check rfkill_register(struct rfkill *rfkill)
 999 {
1000         static unsigned long rfkill_no;
1001         struct device *dev = &rfkill->dev;
1002         int error;
1003
1004         BUG_ON(!rfkill);
1005
1006         mutex_lock(&rfkill_global_mutex);
1007
1008         if (rfkill->registered) {
1009                 error = -EALREADY;
1010                 goto unlock;
1011         }
1012
1013         rfkill->idx = rfkill_no;
1014         dev_set_name(dev, "rfkill%lu", rfkill_no);
1015         rfkill_no++;
1016
1017         list_add_tail(&rfkill->node, &rfkill_list);
1018
1019         error = device_add(dev);
1020         if (error)
1021                 goto remove;
1022
1023         error = rfkill_led_trigger_register(rfkill);
1024         if (error)
1025                 goto devdel;
1026
1027         rfkill->registered = true;
1028
1029         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1030         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1031         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1032
1033         if (rfkill->ops->poll)
1034                 queue_delayed_work(system_power_efficient_wq,
1035                         &rfkill->poll_work,
1036                         round_jiffies_relative(POLL_INTERVAL));
1037
1038         if (!rfkill->persistent || rfkill_epo_lock_active) {
1039                 schedule_work(&rfkill->sync_work);
1040         } else {
1041 #ifdef CONFIG_RFKILL_INPUT
1042                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1043
1044                 if (!atomic_read(&rfkill_input_disabled))
1045                         __rfkill_switch_all(rfkill->type, soft_blocked);
1046 #endif
1047         }
1048
1049         rfkill_any_led_trigger_event();
1050         rfkill_send_events(rfkill, RFKILL_OP_ADD);
1051
1052         mutex_unlock(&rfkill_global_mutex);
1053         return 0;
1054
1055  devdel:
1056         device_del(&rfkill->dev);
1057  remove:
1058         list_del_init(&rfkill->node);
1059  unlock:
1060         mutex_unlock(&rfkill_global_mutex);
1061         return error;
1062 }
1063 EXPORT_SYMBOL(rfkill_register);
1064
1065 void rfkill_unregister(struct rfkill *rfkill)
1066 {
1067         BUG_ON(!rfkill);
1068
1069         if (rfkill->ops->poll)
1070                 cancel_delayed_work_sync(&rfkill->poll_work);
1071
1072         cancel_work_sync(&rfkill->uevent_work);
1073         cancel_work_sync(&rfkill->sync_work);
1074
1075         rfkill->registered = false;
1076
1077         device_del(&rfkill->dev);
1078
1079         mutex_lock(&rfkill_global_mutex);
1080         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1081         list_del_init(&rfkill->node);
1082         rfkill_any_led_trigger_event();
1083         mutex_unlock(&rfkill_global_mutex);
1084
1085         rfkill_led_trigger_unregister(rfkill);
1086 }
1087 EXPORT_SYMBOL(rfkill_unregister);
1088
1089 void rfkill_destroy(struct rfkill *rfkill)
1090 {
1091         if (rfkill)
1092                 put_device(&rfkill->dev);
1093 }
1094 EXPORT_SYMBOL(rfkill_destroy);
1095
1096 static int rfkill_fop_open(struct inode *inode, struct file *file)
1097 {
1098         struct rfkill_data *data;
1099         struct rfkill *rfkill;
1100         struct rfkill_int_event *ev, *tmp;
1101
1102         data = kzalloc(sizeof(*data), GFP_KERNEL);
1103         if (!data)
1104                 return -ENOMEM;
1105
1106         INIT_LIST_HEAD(&data->events);
1107         mutex_init(&data->mtx);
1108         init_waitqueue_head(&data->read_wait);
1109
1110         mutex_lock(&rfkill_global_mutex);
1111         mutex_lock(&data->mtx);
1112         /*
1113          * start getting events from elsewhere but hold mtx to get
1114          * startup events added first
1115          */
1116
1117         list_for_each_entry(rfkill, &rfkill_list, node) {
1118                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1119                 if (!ev)
1120                         goto free;
1121                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1122                 list_add_tail(&ev->list, &data->events);
1123         }
1124         list_add(&data->list, &rfkill_fds);
1125         mutex_unlock(&data->mtx);
1126         mutex_unlock(&rfkill_global_mutex);
1127
1128         file->private_data = data;
1129
1130         return nonseekable_open(inode, file);
1131
1132  free:
1133         mutex_unlock(&data->mtx);
1134         mutex_unlock(&rfkill_global_mutex);
1135         mutex_destroy(&data->mtx);
1136         list_for_each_entry_safe(ev, tmp, &data->events, list)
1137                 kfree(ev);
1138         kfree(data);
1139         return -ENOMEM;
1140 }
1141
1142 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1143 {
1144         struct rfkill_data *data = file->private_data;
1145         __poll_t res = EPOLLOUT | EPOLLWRNORM;
1146
1147         poll_wait(file, &data->read_wait, wait);
1148
1149         mutex_lock(&data->mtx);
1150         if (!list_empty(&data->events))
1151                 res = EPOLLIN | EPOLLRDNORM;
1152         mutex_unlock(&data->mtx);
1153
1154         return res;
1155 }
1156
1157 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1158                                size_t count, loff_t *pos)
1159 {
1160         struct rfkill_data *data = file->private_data;
1161         struct rfkill_int_event *ev;
1162         unsigned long sz;
1163         int ret;
1164
1165         mutex_lock(&data->mtx);
1166
1167         while (list_empty(&data->events)) {
1168                 if (file->f_flags & O_NONBLOCK) {
1169                         ret = -EAGAIN;
1170                         goto out;
1171                 }
1172                 mutex_unlock(&data->mtx);
1173                 /* since we re-check and it just compares pointers,
1174                  * using !list_empty() without locking isn't a problem
1175                  */
1176                 ret = wait_event_interruptible(data->read_wait,
1177                                                !list_empty(&data->events));
1178                 mutex_lock(&data->mtx);
1179
1180                 if (ret)
1181                         goto out;
1182         }
1183
1184         ev = list_first_entry(&data->events, struct rfkill_int_event,
1185                                 list);
1186
1187         sz = min_t(unsigned long, sizeof(ev->ev), count);
1188         ret = sz;
1189         if (copy_to_user(buf, &ev->ev, sz))
1190                 ret = -EFAULT;
1191
1192         list_del(&ev->list);
1193         kfree(ev);
1194  out:
1195         mutex_unlock(&data->mtx);
1196         return ret;
1197 }
1198
1199 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1200                                 size_t count, loff_t *pos)
1201 {
1202         struct rfkill *rfkill;
1203         struct rfkill_event ev;
1204         int ret;
1205
1206         /* we don't need the 'hard' variable but accept it */
1207         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1208                 return -EINVAL;
1209
1210         /*
1211          * Copy as much data as we can accept into our 'ev' buffer,
1212          * but tell userspace how much we've copied so it can determine
1213          * our API version even in a write() call, if it cares.
1214          */
1215         count = min(count, sizeof(ev));
1216         if (copy_from_user(&ev, buf, count))
1217                 return -EFAULT;
1218
1219         if (ev.type >= NUM_RFKILL_TYPES)
1220                 return -EINVAL;
1221
1222         mutex_lock(&rfkill_global_mutex);
1223
1224         switch (ev.op) {
1225         case RFKILL_OP_CHANGE_ALL:
1226                 rfkill_update_global_state(ev.type, ev.soft);
1227                 list_for_each_entry(rfkill, &rfkill_list, node)
1228                         if (rfkill->type == ev.type ||
1229                             ev.type == RFKILL_TYPE_ALL)
1230                                 rfkill_set_block(rfkill, ev.soft);
1231                 ret = 0;
1232                 break;
1233         case RFKILL_OP_CHANGE:
1234                 list_for_each_entry(rfkill, &rfkill_list, node)
1235                         if (rfkill->idx == ev.idx &&
1236                             (rfkill->type == ev.type ||
1237                              ev.type == RFKILL_TYPE_ALL))
1238                                 rfkill_set_block(rfkill, ev.soft);
1239                 ret = 0;
1240                 break;
1241         default:
1242                 ret = -EINVAL;
1243                 break;
1244         }
1245
1246         mutex_unlock(&rfkill_global_mutex);
1247
1248         return ret ?: count;
1249 }
1250
1251 static int rfkill_fop_release(struct inode *inode, struct file *file)
1252 {
1253         struct rfkill_data *data = file->private_data;
1254         struct rfkill_int_event *ev, *tmp;
1255
1256         mutex_lock(&rfkill_global_mutex);
1257         list_del(&data->list);
1258         mutex_unlock(&rfkill_global_mutex);
1259
1260         mutex_destroy(&data->mtx);
1261         list_for_each_entry_safe(ev, tmp, &data->events, list)
1262                 kfree(ev);
1263
1264 #ifdef CONFIG_RFKILL_INPUT
1265         if (data->input_handler)
1266                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1267                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1268 #endif
1269
1270         kfree(data);
1271
1272         return 0;
1273 }
1274
1275 #ifdef CONFIG_RFKILL_INPUT
1276 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1277                              unsigned long arg)
1278 {
1279         struct rfkill_data *data = file->private_data;
1280
1281         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1282                 return -ENOSYS;
1283
1284         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1285                 return -ENOSYS;
1286
1287         mutex_lock(&data->mtx);
1288
1289         if (!data->input_handler) {
1290                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1291                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1292                 data->input_handler = true;
1293         }
1294
1295         mutex_unlock(&data->mtx);
1296
1297         return 0;
1298 }
1299 #endif
1300
1301 static const struct file_operations rfkill_fops = {
1302         .owner          = THIS_MODULE,
1303         .open           = rfkill_fop_open,
1304         .read           = rfkill_fop_read,
1305         .write          = rfkill_fop_write,
1306         .poll           = rfkill_fop_poll,
1307         .release        = rfkill_fop_release,
1308 #ifdef CONFIG_RFKILL_INPUT
1309         .unlocked_ioctl = rfkill_fop_ioctl,
1310         .compat_ioctl   = rfkill_fop_ioctl,
1311 #endif
1312         .llseek         = no_llseek,
1313 };
1314
1315 static struct miscdevice rfkill_miscdev = {
1316         .name   = "rfkill",
1317         .fops   = &rfkill_fops,
1318         .minor  = MISC_DYNAMIC_MINOR,
1319 };
1320
1321 static int __init rfkill_init(void)
1322 {
1323         int error;
1324
1325         rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1326
1327         error = class_register(&rfkill_class);
1328         if (error)
1329                 goto error_class;
1330
1331         error = misc_register(&rfkill_miscdev);
1332         if (error)
1333                 goto error_misc;
1334
1335         error = rfkill_any_led_trigger_register();
1336         if (error)
1337                 goto error_led_trigger;
1338
1339 #ifdef CONFIG_RFKILL_INPUT
1340         error = rfkill_handler_init();
1341         if (error)
1342                 goto error_input;
1343 #endif
1344
1345         return 0;
1346
1347 #ifdef CONFIG_RFKILL_INPUT
1348 error_input:
1349         rfkill_any_led_trigger_unregister();
1350 #endif
1351 error_led_trigger:
1352         misc_deregister(&rfkill_miscdev);
1353 error_misc:
1354         class_unregister(&rfkill_class);
1355 error_class:
1356         return error;
1357 }
1358 subsys_initcall(rfkill_init);
1359
1360 static void __exit rfkill_exit(void)
1361 {
1362 #ifdef CONFIG_RFKILL_INPUT
1363         rfkill_handler_exit();
1364 #endif
1365         rfkill_any_led_trigger_unregister();
1366         misc_deregister(&rfkill_miscdev);
1367         class_unregister(&rfkill_class);
1368 }
1369 module_exit(rfkill_exit);