linux/net/rfkill/core.c
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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#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
  50struct 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
  80struct rfkill_int_event {
  81        struct list_head        list;
  82        struct rfkill_event     ev;
  83};
  84
  85struct 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
  94MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
  95MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  96MODULE_DESCRIPTION("RF switch support");
  97MODULE_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 */
 111static LIST_HEAD(rfkill_list);  /* list of registered rf switches */
 112static DEFINE_MUTEX(rfkill_global_mutex);
 113static LIST_HEAD(rfkill_fds);   /* list of open fds of /dev/rfkill */
 114
 115static unsigned int rfkill_default_state = 1;
 116module_param_named(default_state, rfkill_default_state, uint, 0444);
 117MODULE_PARM_DESC(default_state,
 118                 "Default initial state for all radio types, 0 = radio off");
 119
 120static struct {
 121        bool cur, sav;
 122} rfkill_global_states[NUM_RFKILL_TYPES];
 123
 124static bool rfkill_epo_lock_active;
 125
 126
 127#ifdef CONFIG_RFKILL_LEDS
 128static 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
 143static 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
 152const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 153{
 154        return rfkill->led_trigger.name;
 155}
 156EXPORT_SYMBOL(rfkill_get_led_trigger_name);
 157
 158void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 159{
 160        BUG_ON(!rfkill);
 161
 162        rfkill->ledtrigname = name;
 163}
 164EXPORT_SYMBOL(rfkill_set_led_trigger_name);
 165
 166static 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
 174static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 175{
 176        led_trigger_unregister(&rfkill->led_trigger);
 177}
 178#else
 179static void rfkill_led_trigger_event(struct rfkill *rfkill)
 180{
 181}
 182
 183static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
 184{
 185        return 0;
 186}
 187
 188static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
 189{
 190}
 191#endif /* CONFIG_RFKILL_LEDS */
 192
 193static 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
 209static 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
 226static 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
 237static 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 */
 269static 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
 322static 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 */
 335static 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 */
 358void 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 */
 380void 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 */
 409void 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 */
 430void 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 */
 449bool 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 */
 461bool rfkill_get_global_sw_state(const enum rfkill_type type)
 462{
 463        return rfkill_global_states[type].cur;
 464}
 465#endif
 466
 467
 468bool 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}
 482EXPORT_SYMBOL(rfkill_set_hw_state);
 483
 484static 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
 498bool 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}
 522EXPORT_SYMBOL(rfkill_set_sw_state);
 523
 524void 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}
 536EXPORT_SYMBOL(rfkill_init_sw_state);
 537
 538void 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}
 570EXPORT_SYMBOL(rfkill_set_states);
 571
 572static 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
 581static 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
 605static 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
 614static 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
 623static 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
 632static 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
 641static 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
 650static 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
 675static 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
 685static 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
 694static 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
 720static 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
 727static 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
 734static 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
 746static void rfkill_release(struct device *dev)
 747{
 748        struct rfkill *rfkill = to_rfkill(dev);
 749
 750        kfree(rfkill);
 751}
 752
 753static 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
 775void 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}
 784EXPORT_SYMBOL(rfkill_pause_polling);
 785
 786void 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}
 795EXPORT_SYMBOL(rfkill_resume_polling);
 796
 797static 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
 806static 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
 821static 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
 830bool 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}
 841EXPORT_SYMBOL(rfkill_blocked);
 842
 843
 844struct 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}
 883EXPORT_SYMBOL(rfkill_alloc);
 884
 885static 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
 902static 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
 913static 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
 926int __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}
 989EXPORT_SYMBOL(rfkill_register);
 990
 991void 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}
1012EXPORT_SYMBOL(rfkill_unregister);
1013
1014void rfkill_destroy(struct rfkill *rfkill)
1015{
1016        if (rfkill)
1017                put_device(&rfkill->dev);
1018}
1019EXPORT_SYMBOL(rfkill_destroy);
1020
1021static 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
1067static 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
1082static 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
1093static 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
1132static 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
1183static 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
1208static 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
1233static 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
1246static struct miscdevice rfkill_miscdev = {
1247        .name   = "rfkill",
1248        .fops   = &rfkill_fops,
1249        .minor  = MISC_DYNAMIC_MINOR,
1250};
1251
1252static 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}
1282subsys_initcall(rfkill_init);
1283
1284static 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}
1292module_exit(rfkill_exit);
1293
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