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