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, write to the
  18  * Free Software Foundation, Inc.,
  19  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/capability.h>
  27 #include <linux/list.h>
  28 #include <linux/mutex.h>
  29 #include <linux/rfkill.h>
  30 #include <linux/sched.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/device.h>
  33 #include <linux/miscdevice.h>
  34 #include <linux/wait.h>
  35 #include <linux/poll.h>
  36 #include <linux/fs.h>
  37 #include <linux/slab.h>
  38
  39 #include "rfkill.h"
  40
  41 #define POLL_INTERVAL           (5 * HZ)
  42
  43 #define RFKILL_BLOCK_HW         BIT(0)
  44 #define RFKILL_BLOCK_SW         BIT(1)
  45 #define RFKILL_BLOCK_SW_PREV    BIT(2)
  46 #define RFKILL_BLOCK_ANY        (RFKILL_BLOCK_HW |\
  47                                  RFKILL_BLOCK_SW |\
  48                                  RFKILL_BLOCK_SW_PREV)
  49 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
  50
  51 struct rfkill {
  52         spinlock_t              lock;
  53
  54         const char              *name;
  55         enum rfkill_type        type;
  56
  57         unsigned long           state;
  58
  59         u32                     idx;
  60
  61         bool                    registered;
  62         bool                    persistent;
  63
  64         const struct rfkill_ops *ops;
  65         void                    *data;
  66
  67 #ifdef CONFIG_RFKILL_LEDS
  68         struct led_trigger      led_trigger;
  69         const char              *ledtrigname;
  70 #endif
  71
  72         struct device           dev;
  73         struct list_head        node;
  74
  75         struct delayed_work     poll_work;
  76         struct work_struct      uevent_work;
  77         struct work_struct      sync_work;
  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 static int rfkill_led_trigger_register(struct rfkill *rfkill)
 154 {
 155         rfkill->led_trigger.name = rfkill->ledtrigname
 156                                         ? : dev_name(&rfkill->dev);
 157         rfkill->led_trigger.activate = rfkill_led_trigger_activate;
 158         return led_trigger_register(&rfkill->led_trigger);
 159 }
 160
 161 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 162 {
 163         led_trigger_unregister(&rfkill->led_trigger);
 164 }
 165 #else
 166 static void rfkill_led_trigger_event(struct rfkill *rfkill)
 167 {
 168 }
 169
 170 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 171 {
 172         return 0;
 173 }
 174
 175 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 176 {
 177 }
 178 #endif /* CONFIG_RFKILL_LEDS */
 179
 180 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
 181                               enum rfkill_operation op)
 182 {
 183         unsigned long flags;
 184
 185         ev->idx = rfkill->idx;
 186         ev->type = rfkill->type;
 187         ev->op = op;
 188
 189         spin_lock_irqsave(&rfkill->lock, flags);
 190         ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
 191         ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
 192                                         RFKILL_BLOCK_SW_PREV));
 193         spin_unlock_irqrestore(&rfkill->lock, flags);
 194 }
 195
 196 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
 197 {
 198         struct rfkill_data *data;
 199         struct rfkill_int_event *ev;
 200
 201         list_for_each_entry(data, &rfkill_fds, list) {
 202                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
 203                 if (!ev)
 204                         continue;
 205                 rfkill_fill_event(&ev->ev, rfkill, op);
 206                 mutex_lock(&data->mtx);
 207                 list_add_tail(&ev->list, &data->events);
 208                 mutex_unlock(&data->mtx);
 209                 wake_up_interruptible(&data->read_wait);
 210         }
 211 }
 212
 213 static void rfkill_event(struct rfkill *rfkill)
 214 {
 215         if (!rfkill->registered)
 216                 return;
 217
 218         kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
 219
 220         /* also send event to /dev/rfkill */
 221         rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
 222 }
 223
 224 static bool __rfkill_set_hw_state(struct rfkill *rfkill,
 225                                   bool blocked, bool *change)
 226 {
 227         unsigned long flags;
 228         bool prev, any;
 229
 230         BUG_ON(!rfkill);
 231
 232         spin_lock_irqsave(&rfkill->lock, flags);
 233         prev = !!(rfkill->state & RFKILL_BLOCK_HW);
 234         if (blocked)
 235                 rfkill->state |= RFKILL_BLOCK_HW;
 236         else
 237                 rfkill->state &= ~RFKILL_BLOCK_HW;
 238         *change = prev != blocked;
 239         any = !!(rfkill->state & RFKILL_BLOCK_ANY);
 240         spin_unlock_irqrestore(&rfkill->lock, flags);
 241
 242         rfkill_led_trigger_event(rfkill);
 243
 244         return any;
 245 }
 246
 247 /**
 248  * rfkill_set_block - wrapper for set_block method
 249  *
 250  * @rfkill: the rfkill struct to use
 251  * @blocked: the new software state
 252  *
 253  * Calls the set_block method (when applicable) and handles notifications
 254  * etc. as well.
 255  */
 256 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
 257 {
 258         unsigned long flags;
 259         int err;
 260
 261         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
 262                 return;
 263
 264         /*
 265          * Some platforms (...!) generate input events which affect the
 266          * _hard_ kill state -- whenever something tries to change the
 267          * current software state query the hardware state too.
 268          */
 269         if (rfkill->ops->query)
 270                 rfkill->ops->query(rfkill, rfkill->data);
 271
 272         spin_lock_irqsave(&rfkill->lock, flags);
 273         if (rfkill->state & RFKILL_BLOCK_SW)
 274                 rfkill->state |= RFKILL_BLOCK_SW_PREV;
 275         else
 276                 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 277
 278         if (blocked)
 279                 rfkill->state |= RFKILL_BLOCK_SW;
 280         else
 281                 rfkill->state &= ~RFKILL_BLOCK_SW;
 282
 283         rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
 284         spin_unlock_irqrestore(&rfkill->lock, flags);
 285
 286         err = rfkill->ops->set_block(rfkill->data, blocked);
 287
 288         spin_lock_irqsave(&rfkill->lock, flags);
 289         if (err) {
 290                 /*
 291                  * Failed -- reset status to _prev, this may be different
 292                  * from what set set _PREV to earlier in this function
 293                  * if rfkill_set_sw_state was invoked.
 294                  */
 295                 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
 296                         rfkill->state |= RFKILL_BLOCK_SW;
 297                 else
 298                         rfkill->state &= ~RFKILL_BLOCK_SW;
 299         }
 300         rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
 301         rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
 302         spin_unlock_irqrestore(&rfkill->lock, flags);
 303
 304         rfkill_led_trigger_event(rfkill);
 305         rfkill_event(rfkill);
 306 }
 307
 308 #ifdef CONFIG_RFKILL_INPUT
 309 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
 310
 311 /**
 312  * __rfkill_switch_all - Toggle state of all switches of given type
 313  * @type: type of interfaces to be affected
 314  * @state: the new state
 315  *
 316  * This function sets the state of all switches of given type,
 317  * unless a specific switch is claimed by userspace (in which case,
 318  * that switch is left alone) or suspended.
 319  *
 320  * Caller must have acquired rfkill_global_mutex.
 321  */
 322 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
 323 {
 324         struct rfkill *rfkill;
 325
 326         rfkill_global_states[type].cur = blocked;
 327         list_for_each_entry(rfkill, &rfkill_list, node) {
 328                 if (rfkill->type != type)
 329                         continue;
 330
 331                 rfkill_set_block(rfkill, blocked);
 332         }
 333 }
 334
 335 /**
 336  * rfkill_switch_all - Toggle state of all switches of given type
 337  * @type: type of interfaces to be affected
 338  * @state: the new state
 339  *
 340  * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 341  * Please refer to __rfkill_switch_all() for details.
 342  *
 343  * Does nothing if the EPO lock is active.
 344  */
 345 void rfkill_switch_all(enum rfkill_type type, bool blocked)
 346 {
 347         if (atomic_read(&rfkill_input_disabled))
 348                 return;
 349
 350         mutex_lock(&rfkill_global_mutex);
 351
 352         if (!rfkill_epo_lock_active)
 353                 __rfkill_switch_all(type, blocked);
 354
 355         mutex_unlock(&rfkill_global_mutex);
 356 }
 357
 358 /**
 359  * rfkill_epo - emergency power off all transmitters
 360  *
 361  * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 362  * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 363  *
 364  * The global state before the EPO is saved and can be restored later
 365  * using rfkill_restore_states().
 366  */
 367 void rfkill_epo(void)
 368 {
 369         struct rfkill *rfkill;
 370         int i;
 371
 372         if (atomic_read(&rfkill_input_disabled))
 373                 return;
 374
 375         mutex_lock(&rfkill_global_mutex);
 376
 377         rfkill_epo_lock_active = true;
 378         list_for_each_entry(rfkill, &rfkill_list, node)
 379                 rfkill_set_block(rfkill, true);
 380
 381         for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 382                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
 383                 rfkill_global_states[i].cur = true;
 384         }
 385
 386         mutex_unlock(&rfkill_global_mutex);
 387 }
 388
 389 /**
 390  * rfkill_restore_states - restore global states
 391  *
 392  * Restore (and sync switches to) the global state from the
 393  * states in rfkill_default_states.  This can undo the effects of
 394  * a call to rfkill_epo().
 395  */
 396 void rfkill_restore_states(void)
 397 {
 398         int i;
 399
 400         if (atomic_read(&rfkill_input_disabled))
 401                 return;
 402
 403         mutex_lock(&rfkill_global_mutex);
 404
 405         rfkill_epo_lock_active = false;
 406         for (i = 0; i < NUM_RFKILL_TYPES; i++)
 407                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
 408         mutex_unlock(&rfkill_global_mutex);
 409 }
 410
 411 /**
 412  * rfkill_remove_epo_lock - unlock state changes
 413  *
 414  * Used by rfkill-input manually unlock state changes, when
 415  * the EPO switch is deactivated.
 416  */
 417 void rfkill_remove_epo_lock(void)
 418 {
 419         if (atomic_read(&rfkill_input_disabled))
 420                 return;
 421
 422         mutex_lock(&rfkill_global_mutex);
 423         rfkill_epo_lock_active = false;
 424         mutex_unlock(&rfkill_global_mutex);
 425 }
 426
 427 /**
 428  * rfkill_is_epo_lock_active - returns true EPO is active
 429  *
 430  * Returns 0 (false) if there is NOT an active EPO contidion,
 431  * and 1 (true) if there is an active EPO contition, which
 432  * locks all radios in one of the BLOCKED states.
 433  *
 434  * Can be called in atomic context.
 435  */
 436 bool rfkill_is_epo_lock_active(void)
 437 {
 438         return rfkill_epo_lock_active;
 439 }
 440
 441 /**
 442  * rfkill_get_global_sw_state - returns global state for a type
 443  * @type: the type to get the global state of
 444  *
 445  * Returns the current global state for a given wireless
 446  * device type.
 447  */
 448 bool rfkill_get_global_sw_state(const enum rfkill_type type)
 449 {
 450         return rfkill_global_states[type].cur;
 451 }
 452 #endif
 453
 454
 455 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 456 {
 457         bool ret, change;
 458
 459         ret = __rfkill_set_hw_state(rfkill, blocked, &change);
 460
 461         if (!rfkill->registered)
 462                 return ret;
 463
 464         if (change)
 465                 schedule_work(&rfkill->uevent_work);
 466
 467         return ret;
 468 }
 469 EXPORT_SYMBOL(rfkill_set_hw_state);
 470
 471 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 472 {
 473         u32 bit = RFKILL_BLOCK_SW;
 474
 475         /* if in a ops->set_block right now, use other bit */
 476         if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
 477                 bit = RFKILL_BLOCK_SW_PREV;
 478
 479         if (blocked)
 480                 rfkill->state |= bit;
 481         else
 482                 rfkill->state &= ~bit;
 483 }
 484
 485 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 486 {
 487         unsigned long flags;
 488         bool prev, hwblock;
 489
 490         BUG_ON(!rfkill);
 491
 492         spin_lock_irqsave(&rfkill->lock, flags);
 493         prev = !!(rfkill->state & RFKILL_BLOCK_SW);
 494         __rfkill_set_sw_state(rfkill, blocked);
 495         hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
 496         blocked = blocked || hwblock;
 497         spin_unlock_irqrestore(&rfkill->lock, flags);
 498
 499         if (!rfkill->registered)
 500                 return blocked;
 501
 502         if (prev != blocked && !hwblock)
 503                 schedule_work(&rfkill->uevent_work);
 504
 505         rfkill_led_trigger_event(rfkill);
 506
 507         return blocked;
 508 }
 509 EXPORT_SYMBOL(rfkill_set_sw_state);
 510
 511 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 512 {
 513         unsigned long flags;
 514
 515         BUG_ON(!rfkill);
 516         BUG_ON(rfkill->registered);
 517
 518         spin_lock_irqsave(&rfkill->lock, flags);
 519         __rfkill_set_sw_state(rfkill, blocked);
 520         rfkill->persistent = true;
 521         spin_unlock_irqrestore(&rfkill->lock, flags);
 522 }
 523 EXPORT_SYMBOL(rfkill_init_sw_state);
 524
 525 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 526 {
 527         unsigned long flags;
 528         bool swprev, hwprev;
 529
 530         BUG_ON(!rfkill);
 531
 532         spin_lock_irqsave(&rfkill->lock, flags);
 533
 534         /*
 535          * No need to care about prev/setblock ... this is for uevent only
 536          * and that will get triggered by rfkill_set_block anyway.
 537          */
 538         swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
 539         hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
 540         __rfkill_set_sw_state(rfkill, sw);
 541         if (hw)
 542                 rfkill->state |= RFKILL_BLOCK_HW;
 543         else
 544                 rfkill->state &= ~RFKILL_BLOCK_HW;
 545
 546         spin_unlock_irqrestore(&rfkill->lock, flags);
 547
 548         if (!rfkill->registered) {
 549                 rfkill->persistent = true;
 550         } else {
 551                 if (swprev != sw || hwprev != hw)
 552                         schedule_work(&rfkill->uevent_work);
 553
 554                 rfkill_led_trigger_event(rfkill);
 555         }
 556 }
 557 EXPORT_SYMBOL(rfkill_set_states);
 558
 559 static ssize_t rfkill_name_show(struct device *dev,
 560                                 struct device_attribute *attr,
 561                                 char *buf)
 562 {
 563         struct rfkill *rfkill = to_rfkill(dev);
 564
 565         return sprintf(buf, "%s\n", rfkill->name);
 566 }
 567
 568 static const char *rfkill_get_type_str(enum rfkill_type type)
 569 {
 570         BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1);
 571
 572         switch (type) {
 573         case RFKILL_TYPE_WLAN:
 574                 return "wlan";
 575         case RFKILL_TYPE_BLUETOOTH:
 576                 return "bluetooth";
 577         case RFKILL_TYPE_UWB:
 578                 return "ultrawideband";
 579         case RFKILL_TYPE_WIMAX:
 580                 return "wimax";
 581         case RFKILL_TYPE_WWAN:
 582                 return "wwan";
 583         case RFKILL_TYPE_GPS:
 584                 return "gps";
 585         case RFKILL_TYPE_FM:
 586                 return "fm";
 587         default:
 588                 BUG();
 589         }
 590 }
 591
 592 static ssize_t rfkill_type_show(struct device *dev,
 593                                 struct device_attribute *attr,
 594                                 char *buf)
 595 {
 596         struct rfkill *rfkill = to_rfkill(dev);
 597
 598         return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
 599 }
 600
 601 static ssize_t rfkill_idx_show(struct device *dev,
 602                                struct device_attribute *attr,
 603                                char *buf)
 604 {
 605         struct rfkill *rfkill = to_rfkill(dev);
 606
 607         return sprintf(buf, "%d\n", rfkill->idx);
 608 }
 609
 610 static ssize_t rfkill_persistent_show(struct device *dev,
 611                                struct device_attribute *attr,
 612                                char *buf)
 613 {
 614         struct rfkill *rfkill = to_rfkill(dev);
 615
 616         return sprintf(buf, "%d\n", rfkill->persistent);
 617 }
 618
 619 static ssize_t rfkill_hard_show(struct device *dev,
 620                                  struct device_attribute *attr,
 621                                  char *buf)
 622 {
 623         struct rfkill *rfkill = to_rfkill(dev);
 624
 625         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
 626 }
 627
 628 static ssize_t rfkill_soft_show(struct device *dev,
 629                                  struct device_attribute *attr,
 630                                  char *buf)
 631 {
 632         struct rfkill *rfkill = to_rfkill(dev);
 633
 634         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
 635 }
 636
 637 static ssize_t rfkill_soft_store(struct device *dev,
 638                                   struct device_attribute *attr,
 639                                   const char *buf, size_t count)
 640 {
 641         struct rfkill *rfkill = to_rfkill(dev);
 642         unsigned long state;
 643         int err;
 644
 645         if (!capable(CAP_NET_ADMIN))
 646                 return -EPERM;
 647
 648         err = kstrtoul(buf, 0, &state);
 649         if (err)
 650                 return err;
 651
 652         if (state > 1 )
 653                 return -EINVAL;
 654
 655         mutex_lock(&rfkill_global_mutex);
 656         rfkill_set_block(rfkill, state);
 657         mutex_unlock(&rfkill_global_mutex);
 658
 659         return err ?: count;
 660 }
 661
 662 static u8 user_state_from_blocked(unsigned long state)
 663 {
 664         if (state & RFKILL_BLOCK_HW)
 665                 return RFKILL_USER_STATE_HARD_BLOCKED;
 666         if (state & RFKILL_BLOCK_SW)
 667                 return RFKILL_USER_STATE_SOFT_BLOCKED;
 668
 669         return RFKILL_USER_STATE_UNBLOCKED;
 670 }
 671
 672 static ssize_t rfkill_state_show(struct device *dev,
 673                                  struct device_attribute *attr,
 674                                  char *buf)
 675 {
 676         struct rfkill *rfkill = to_rfkill(dev);
 677
 678         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
 679 }
 680
 681 static ssize_t rfkill_state_store(struct device *dev,
 682                                   struct device_attribute *attr,
 683                                   const char *buf, size_t count)
 684 {
 685         struct rfkill *rfkill = to_rfkill(dev);
 686         unsigned long state;
 687         int err;
 688
 689         if (!capable(CAP_NET_ADMIN))
 690                 return -EPERM;
 691
 692         err = kstrtoul(buf, 0, &state);
 693         if (err)
 694                 return err;
 695
 696         if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
 697             state != RFKILL_USER_STATE_UNBLOCKED)
 698                 return -EINVAL;
 699
 700         mutex_lock(&rfkill_global_mutex);
 701         rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
 702         mutex_unlock(&rfkill_global_mutex);
 703
 704         return err ?: count;
 705 }
 706
 707 static ssize_t rfkill_claim_show(struct device *dev,
 708                                  struct device_attribute *attr,
 709                                  char *buf)
 710 {
 711         return sprintf(buf, "%d\n", 0);
 712 }
 713
 714 static ssize_t rfkill_claim_store(struct device *dev,
 715                                   struct device_attribute *attr,
 716                                   const char *buf, size_t count)
 717 {
 718         return -EOPNOTSUPP;
 719 }
 720
 721 static struct device_attribute rfkill_dev_attrs[] = {
 722         __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
 723         __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
 724         __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
 725         __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
 726         __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 727         __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
 728         __ATTR(soft, S_IRUGO|S_IWUSR, rfkill_soft_show, rfkill_soft_store),
 729         __ATTR(hard, S_IRUGO, rfkill_hard_show, NULL),
 730         __ATTR_NULL
 731 };
 732
 733 static void rfkill_release(struct device *dev)
 734 {
 735         struct rfkill *rfkill = to_rfkill(dev);
 736
 737         kfree(rfkill);
 738 }
 739
 740 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
 741 {
 742         struct rfkill *rfkill = to_rfkill(dev);
 743         unsigned long flags;
 744         u32 state;
 745         int error;
 746
 747         error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
 748         if (error)
 749                 return error;
 750         error = add_uevent_var(env, "RFKILL_TYPE=%s",
 751                                rfkill_get_type_str(rfkill->type));
 752         if (error)
 753                 return error;
 754         spin_lock_irqsave(&rfkill->lock, flags);
 755         state = rfkill->state;
 756         spin_unlock_irqrestore(&rfkill->lock, flags);
 757         error = add_uevent_var(env, "RFKILL_STATE=%d",
 758                                user_state_from_blocked(state));
 759         return error;
 760 }
 761
 762 void rfkill_pause_polling(struct rfkill *rfkill)
 763 {
 764         BUG_ON(!rfkill);
 765
 766         if (!rfkill->ops->poll)
 767                 return;
 768
 769         cancel_delayed_work_sync(&rfkill->poll_work);
 770 }
 771 EXPORT_SYMBOL(rfkill_pause_polling);
 772
 773 void rfkill_resume_polling(struct rfkill *rfkill)
 774 {
 775         BUG_ON(!rfkill);
 776
 777         if (!rfkill->ops->poll)
 778                 return;
 779
 780         schedule_work(&rfkill->poll_work.work);
 781 }
 782 EXPORT_SYMBOL(rfkill_resume_polling);
 783
 784 static int rfkill_suspend(struct device *dev, pm_message_t state)
 785 {
 786         struct rfkill *rfkill = to_rfkill(dev);
 787
 788         rfkill_pause_polling(rfkill);
 789
 790         return 0;
 791 }
 792
 793 static int rfkill_resume(struct device *dev)
 794 {
 795         struct rfkill *rfkill = to_rfkill(dev);
 796         bool cur;
 797
 798         if (!rfkill->persistent) {
 799                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
 800                 rfkill_set_block(rfkill, cur);
 801         }
 802
 803         rfkill_resume_polling(rfkill);
 804
 805         return 0;
 806 }
 807
 808 static struct class rfkill_class = {
 809         .name           = "rfkill",
 810         .dev_release    = rfkill_release,
 811         .dev_attrs      = rfkill_dev_attrs,
 812         .dev_uevent     = rfkill_dev_uevent,
 813         .suspend        = rfkill_suspend,
 814         .resume         = rfkill_resume,
 815 };
 816
 817 bool rfkill_blocked(struct rfkill *rfkill)
 818 {
 819         unsigned long flags;
 820         u32 state;
 821
 822         spin_lock_irqsave(&rfkill->lock, flags);
 823         state = rfkill->state;
 824         spin_unlock_irqrestore(&rfkill->lock, flags);
 825
 826         return !!(state & RFKILL_BLOCK_ANY);
 827 }
 828 EXPORT_SYMBOL(rfkill_blocked);
 829
 830
 831 struct rfkill * __must_check rfkill_alloc(const char *name,
 832                                           struct device *parent,
 833                                           const enum rfkill_type type,
 834                                           const struct rfkill_ops *ops,
 835                                           void *ops_data)
 836 {
 837         struct rfkill *rfkill;
 838         struct device *dev;
 839
 840         if (WARN_ON(!ops))
 841                 return NULL;
 842
 843         if (WARN_ON(!ops->set_block))
 844                 return NULL;
 845
 846         if (WARN_ON(!name))
 847                 return NULL;
 848
 849         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 850                 return NULL;
 851
 852         rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
 853         if (!rfkill)
 854                 return NULL;
 855
 856         spin_lock_init(&rfkill->lock);
 857         INIT_LIST_HEAD(&rfkill->node);
 858         rfkill->type = type;
 859         rfkill->name = name;
 860         rfkill->ops = ops;
 861         rfkill->data = ops_data;
 862
 863         dev = &rfkill->dev;
 864         dev->class = &rfkill_class;
 865         dev->parent = parent;
 866         device_initialize(dev);
 867
 868         return rfkill;
 869 }
 870 EXPORT_SYMBOL(rfkill_alloc);
 871
 872 static void rfkill_poll(struct work_struct *work)
 873 {
 874         struct rfkill *rfkill;
 875
 876         rfkill = container_of(work, struct rfkill, poll_work.work);
 877
 878         /*
 879          * Poll hardware state -- driver will use one of the
 880          * rfkill_set{,_hw,_sw}_state functions and use its
 881          * return value to update the current status.
 882          */
 883         rfkill->ops->poll(rfkill, rfkill->data);
 884
 885         schedule_delayed_work(&rfkill->poll_work,
 886                 round_jiffies_relative(POLL_INTERVAL));
 887 }
 888
 889 static void rfkill_uevent_work(struct work_struct *work)
 890 {
 891         struct rfkill *rfkill;
 892
 893         rfkill = container_of(work, struct rfkill, uevent_work);
 894
 895         mutex_lock(&rfkill_global_mutex);
 896         rfkill_event(rfkill);
 897         mutex_unlock(&rfkill_global_mutex);
 898 }
 899
 900 static void rfkill_sync_work(struct work_struct *work)
 901 {
 902         struct rfkill *rfkill;
 903         bool cur;
 904
 905         rfkill = container_of(work, struct rfkill, sync_work);
 906
 907         mutex_lock(&rfkill_global_mutex);
 908         cur = rfkill_global_states[rfkill->type].cur;
 909         rfkill_set_block(rfkill, cur);
 910         mutex_unlock(&rfkill_global_mutex);
 911 }
 912
 913 int __must_check rfkill_register(struct rfkill *rfkill)
 914 {
 915         static unsigned long rfkill_no;
 916         struct device *dev = &rfkill->dev;
 917         int error;
 918
 919         BUG_ON(!rfkill);
 920
 921         mutex_lock(&rfkill_global_mutex);
 922
 923         if (rfkill->registered) {
 924                 error = -EALREADY;
 925                 goto unlock;
 926         }
 927
 928         rfkill->idx = rfkill_no;
 929         dev_set_name(dev, "rfkill%lu", rfkill_no);
 930         rfkill_no++;
 931
 932         list_add_tail(&rfkill->node, &rfkill_list);
 933
 934         error = device_add(dev);
 935         if (error)
 936                 goto remove;
 937
 938         error = rfkill_led_trigger_register(rfkill);
 939         if (error)
 940                 goto devdel;
 941
 942         rfkill->registered = true;
 943
 944         INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
 945         INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
 946         INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
 947
 948         if (rfkill->ops->poll)
 949                 schedule_delayed_work(&rfkill->poll_work,
 950                         round_jiffies_relative(POLL_INTERVAL));
 951
 952         if (!rfkill->persistent || rfkill_epo_lock_active) {
 953                 schedule_work(&rfkill->sync_work);
 954         } else {
 955 #ifdef CONFIG_RFKILL_INPUT
 956                 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
 957
 958                 if (!atomic_read(&rfkill_input_disabled))
 959                         __rfkill_switch_all(rfkill->type, soft_blocked);
 960 #endif
 961         }
 962
 963         rfkill_send_events(rfkill, RFKILL_OP_ADD);
 964
 965         mutex_unlock(&rfkill_global_mutex);
 966         return 0;
 967
 968  devdel:
 969         device_del(&rfkill->dev);
 970  remove:
 971         list_del_init(&rfkill->node);
 972  unlock:
 973         mutex_unlock(&rfkill_global_mutex);
 974         return error;
 975 }
 976 EXPORT_SYMBOL(rfkill_register);
 977
 978 void rfkill_unregister(struct rfkill *rfkill)
 979 {
 980         BUG_ON(!rfkill);
 981
 982         if (rfkill->ops->poll)
 983                 cancel_delayed_work_sync(&rfkill->poll_work);
 984
 985         cancel_work_sync(&rfkill->uevent_work);
 986         cancel_work_sync(&rfkill->sync_work);
 987
 988         rfkill->registered = false;
 989
 990         device_del(&rfkill->dev);
 991
 992         mutex_lock(&rfkill_global_mutex);
 993         rfkill_send_events(rfkill, RFKILL_OP_DEL);
 994         list_del_init(&rfkill->node);
 995         mutex_unlock(&rfkill_global_mutex);
 996
 997         rfkill_led_trigger_unregister(rfkill);
 998 }
 999 EXPORT_SYMBOL(rfkill_unregister);
1000
1001 void rfkill_destroy(struct rfkill *rfkill)
1002 {
1003         if (rfkill)
1004                 put_device(&rfkill->dev);
1005 }
1006 EXPORT_SYMBOL(rfkill_destroy);
1007
1008 static int rfkill_fop_open(struct inode *inode, struct file *file)
1009 {
1010         struct rfkill_data *data;
1011         struct rfkill *rfkill;
1012         struct rfkill_int_event *ev, *tmp;
1013
1014         data = kzalloc(sizeof(*data), GFP_KERNEL);
1015         if (!data)
1016                 return -ENOMEM;
1017
1018         INIT_LIST_HEAD(&data->events);
1019         mutex_init(&data->mtx);
1020         init_waitqueue_head(&data->read_wait);
1021
1022         mutex_lock(&rfkill_global_mutex);
1023         mutex_lock(&data->mtx);
1024         /*
1025          * start getting events from elsewhere but hold mtx to get
1026          * startup events added first
1027          */
1028
1029         list_for_each_entry(rfkill, &rfkill_list, node) {
1030                 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1031                 if (!ev)
1032                         goto free;
1033                 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1034                 list_add_tail(&ev->list, &data->events);
1035         }
1036         list_add(&data->list, &rfkill_fds);
1037         mutex_unlock(&data->mtx);
1038         mutex_unlock(&rfkill_global_mutex);
1039
1040         file->private_data = data;
1041
1042         return nonseekable_open(inode, file);
1043
1044  free:
1045         mutex_unlock(&data->mtx);
1046         mutex_unlock(&rfkill_global_mutex);
1047         mutex_destroy(&data->mtx);
1048         list_for_each_entry_safe(ev, tmp, &data->events, list)
1049                 kfree(ev);
1050         kfree(data);
1051         return -ENOMEM;
1052 }
1053
1054 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1055 {
1056         struct rfkill_data *data = file->private_data;
1057         unsigned int res = POLLOUT | POLLWRNORM;
1058
1059         poll_wait(file, &data->read_wait, wait);
1060
1061         mutex_lock(&data->mtx);
1062         if (!list_empty(&data->events))
1063                 res = POLLIN | POLLRDNORM;
1064         mutex_unlock(&data->mtx);
1065
1066         return res;
1067 }
1068
1069 static bool rfkill_readable(struct rfkill_data *data)
1070 {
1071         bool r;
1072
1073         mutex_lock(&data->mtx);
1074         r = !list_empty(&data->events);
1075         mutex_unlock(&data->mtx);
1076
1077         return r;
1078 }
1079
1080 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1081                                size_t count, loff_t *pos)
1082 {
1083         struct rfkill_data *data = file->private_data;
1084         struct rfkill_int_event *ev;
1085         unsigned long sz;
1086         int ret;
1087
1088         mutex_lock(&data->mtx);
1089
1090         while (list_empty(&data->events)) {
1091                 if (file->f_flags & O_NONBLOCK) {
1092                         ret = -EAGAIN;
1093                         goto out;
1094                 }
1095                 mutex_unlock(&data->mtx);
1096                 ret = wait_event_interruptible(data->read_wait,
1097                                                rfkill_readable(data));
1098                 mutex_lock(&data->mtx);
1099
1100                 if (ret)
1101                         goto out;
1102         }
1103
1104         ev = list_first_entry(&data->events, struct rfkill_int_event,
1105                                 list);
1106
1107         sz = min_t(unsigned long, sizeof(ev->ev), count);
1108         ret = sz;
1109         if (copy_to_user(buf, &ev->ev, sz))
1110                 ret = -EFAULT;
1111
1112         list_del(&ev->list);
1113         kfree(ev);
1114  out:
1115         mutex_unlock(&data->mtx);
1116         return ret;
1117 }
1118
1119 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1120                                 size_t count, loff_t *pos)
1121 {
1122         struct rfkill *rfkill;
1123         struct rfkill_event ev;
1124
1125         /* we don't need the 'hard' variable but accept it */
1126         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1127                 return -EINVAL;
1128
1129         /*
1130          * Copy as much data as we can accept into our 'ev' buffer,
1131          * but tell userspace how much we've copied so it can determine
1132          * our API version even in a write() call, if it cares.
1133          */
1134         count = min(count, sizeof(ev));
1135         if (copy_from_user(&ev, buf, count))
1136                 return -EFAULT;
1137
1138         if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1139                 return -EINVAL;
1140
1141         if (ev.type >= NUM_RFKILL_TYPES)
1142                 return -EINVAL;
1143
1144         mutex_lock(&rfkill_global_mutex);
1145
1146         if (ev.op == RFKILL_OP_CHANGE_ALL) {
1147                 if (ev.type == RFKILL_TYPE_ALL) {
1148                         enum rfkill_type i;
1149                         for (i = 0; i < NUM_RFKILL_TYPES; i++)
1150                                 rfkill_global_states[i].cur = ev.soft;
1151                 } else {
1152                         rfkill_global_states[ev.type].cur = ev.soft;
1153                 }
1154         }
1155
1156         list_for_each_entry(rfkill, &rfkill_list, node) {
1157                 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1158                         continue;
1159
1160                 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1161                         continue;
1162
1163                 rfkill_set_block(rfkill, ev.soft);
1164         }
1165         mutex_unlock(&rfkill_global_mutex);
1166
1167         return count;
1168 }
1169
1170 static int rfkill_fop_release(struct inode *inode, struct file *file)
1171 {
1172         struct rfkill_data *data = file->private_data;
1173         struct rfkill_int_event *ev, *tmp;
1174
1175         mutex_lock(&rfkill_global_mutex);
1176         list_del(&data->list);
1177         mutex_unlock(&rfkill_global_mutex);
1178
1179         mutex_destroy(&data->mtx);
1180         list_for_each_entry_safe(ev, tmp, &data->events, list)
1181                 kfree(ev);
1182
1183 #ifdef CONFIG_RFKILL_INPUT
1184         if (data->input_handler)
1185                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1186                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1187 #endif
1188
1189         kfree(data);
1190
1191         return 0;
1192 }
1193
1194 #ifdef CONFIG_RFKILL_INPUT
1195 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1196                              unsigned long arg)
1197 {
1198         struct rfkill_data *data = file->private_data;
1199
1200         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1201                 return -ENOSYS;
1202
1203         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1204                 return -ENOSYS;
1205
1206         mutex_lock(&data->mtx);
1207
1208         if (!data->input_handler) {
1209                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1210                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1211                 data->input_handler = true;
1212         }
1213
1214         mutex_unlock(&data->mtx);
1215
1216         return 0;
1217 }
1218 #endif
1219
1220 static const struct file_operations rfkill_fops = {
1221         .owner          = THIS_MODULE,
1222         .open           = rfkill_fop_open,
1223         .read           = rfkill_fop_read,
1224         .write          = rfkill_fop_write,
1225         .poll           = rfkill_fop_poll,
1226         .release        = rfkill_fop_release,
1227 #ifdef CONFIG_RFKILL_INPUT
1228         .unlocked_ioctl = rfkill_fop_ioctl,
1229         .compat_ioctl   = rfkill_fop_ioctl,
1230 #endif
1231         .llseek         = no_llseek,
1232 };
1233
1234 static struct miscdevice rfkill_miscdev = {
1235         .name   = "rfkill",
1236         .fops   = &rfkill_fops,
1237         .minor  = MISC_DYNAMIC_MINOR,
1238 };
1239
1240 static int __init rfkill_init(void)
1241 {
1242         int error;
1243         int i;
1244
1245         for (i = 0; i < NUM_RFKILL_TYPES; i++)
1246                 rfkill_global_states[i].cur = !rfkill_default_state;
1247
1248         error = class_register(&rfkill_class);
1249         if (error)
1250                 goto out;
1251
1252         error = misc_register(&rfkill_miscdev);
1253         if (error) {
1254                 class_unregister(&rfkill_class);
1255                 goto out;
1256         }
1257
1258 #ifdef CONFIG_RFKILL_INPUT
1259         error = rfkill_handler_init();
1260         if (error) {
1261                 misc_deregister(&rfkill_miscdev);
1262                 class_unregister(&rfkill_class);
1263                 goto out;
1264         }
1265 #endif
1266
1267  out:
1268         return error;
1269 }
1270 subsys_initcall(rfkill_init);
1271
1272 static void __exit rfkill_exit(void)
1273 {
1274 #ifdef CONFIG_RFKILL_INPUT
1275         rfkill_handler_exit();
1276 #endif
1277         misc_deregister(&rfkill_miscdev);
1278         class_unregister(&rfkill_class);
1279 }
1280 module_exit(rfkill_exit);