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