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