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 u8 user_state_from_blocked(unsigned long state) 633 { 634 if (state & RFKILL_BLOCK_HW) 635 return RFKILL_USER_STATE_HARD_BLOCKED; 636 if (state & RFKILL_BLOCK_SW) 637 return RFKILL_USER_STATE_SOFT_BLOCKED; 638 639 return RFKILL_USER_STATE_UNBLOCKED; 640 } 641 642 static ssize_t rfkill_state_show(struct device *dev, 643 struct device_attribute *attr, 644 char *buf) 645 { 646 struct rfkill *rfkill = to_rfkill(dev); 647 unsigned long flags; 648 u32 state; 649 650 spin_lock_irqsave(&rfkill->lock, flags); 651 state = rfkill->state; 652 spin_unlock_irqrestore(&rfkill->lock, flags); 653 654 return sprintf(buf, "%d\n", user_state_from_blocked(state)); 655 } 656 657 static ssize_t rfkill_state_store(struct device *dev, 658 struct device_attribute *attr, 659 const char *buf, size_t count) 660 { 661 struct rfkill *rfkill = to_rfkill(dev); 662 unsigned long state; 663 int err; 664 665 if (!capable(CAP_NET_ADMIN)) 666 return -EPERM; 667 668 err = strict_strtoul(buf, 0, &state); 669 if (err) 670 return err; 671 672 if (state != RFKILL_USER_STATE_SOFT_BLOCKED && 673 state != RFKILL_USER_STATE_UNBLOCKED) 674 return -EINVAL; 675 676 mutex_lock(&rfkill_global_mutex); 677 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); 678 mutex_unlock(&rfkill_global_mutex); 679 680 return err ?: count; 681 } 682 683 static ssize_t rfkill_claim_show(struct device *dev, 684 struct device_attribute *attr, 685 char *buf) 686 { 687 return sprintf(buf, "%d\n", 0); 688 } 689 690 static ssize_t rfkill_claim_store(struct device *dev, 691 struct device_attribute *attr, 692 const char *buf, size_t count) 693 { 694 return -EOPNOTSUPP; 695 } 696 697 static struct device_attribute rfkill_dev_attrs[] = { 698 __ATTR(name, S_IRUGO, rfkill_name_show, NULL), 699 __ATTR(type, S_IRUGO, rfkill_type_show, NULL), 700 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL), 701 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL), 702 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), 703 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), 704 __ATTR_NULL 705 }; 706 707 static void rfkill_release(struct device *dev) 708 { 709 struct rfkill *rfkill = to_rfkill(dev); 710 711 kfree(rfkill); 712 } 713 714 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) 715 { 716 struct rfkill *rfkill = to_rfkill(dev); 717 unsigned long flags; 718 u32 state; 719 int error; 720 721 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); 722 if (error) 723 return error; 724 error = add_uevent_var(env, "RFKILL_TYPE=%s", 725 rfkill_get_type_str(rfkill->type)); 726 if (error) 727 return error; 728 spin_lock_irqsave(&rfkill->lock, flags); 729 state = rfkill->state; 730 spin_unlock_irqrestore(&rfkill->lock, flags); 731 error = add_uevent_var(env, "RFKILL_STATE=%d", 732 user_state_from_blocked(state)); 733 return error; 734 } 735 736 void rfkill_pause_polling(struct rfkill *rfkill) 737 { 738 BUG_ON(!rfkill); 739 740 if (!rfkill->ops->poll) 741 return; 742 743 cancel_delayed_work_sync(&rfkill->poll_work); 744 } 745 EXPORT_SYMBOL(rfkill_pause_polling); 746 747 void rfkill_resume_polling(struct rfkill *rfkill) 748 { 749 BUG_ON(!rfkill); 750 751 if (!rfkill->ops->poll) 752 return; 753 754 schedule_work(&rfkill->poll_work.work); 755 } 756 EXPORT_SYMBOL(rfkill_resume_polling); 757 758 static int rfkill_suspend(struct device *dev, pm_message_t state) 759 { 760 struct rfkill *rfkill = to_rfkill(dev); 761 762 rfkill_pause_polling(rfkill); 763 764 return 0; 765 } 766 767 static int rfkill_resume(struct device *dev) 768 { 769 struct rfkill *rfkill = to_rfkill(dev); 770 bool cur; 771 772 if (!rfkill->persistent) { 773 cur = !!(rfkill->state & RFKILL_BLOCK_SW); 774 rfkill_set_block(rfkill, cur); 775 } 776 777 rfkill_resume_polling(rfkill); 778 779 return 0; 780 } 781 782 static struct class rfkill_class = { 783 .name = "rfkill", 784 .dev_release = rfkill_release, 785 .dev_attrs = rfkill_dev_attrs, 786 .dev_uevent = rfkill_dev_uevent, 787 .suspend = rfkill_suspend, 788 .resume = rfkill_resume, 789 }; 790 791 bool rfkill_blocked(struct rfkill *rfkill) 792 { 793 unsigned long flags; 794 u32 state; 795 796 spin_lock_irqsave(&rfkill->lock, flags); 797 state = rfkill->state; 798 spin_unlock_irqrestore(&rfkill->lock, flags); 799 800 return !!(state & RFKILL_BLOCK_ANY); 801 } 802 EXPORT_SYMBOL(rfkill_blocked); 803 804 805 struct rfkill * __must_check rfkill_alloc(const char *name, 806 struct device *parent, 807 const enum rfkill_type type, 808 const struct rfkill_ops *ops, 809 void *ops_data) 810 { 811 struct rfkill *rfkill; 812 struct device *dev; 813 814 if (WARN_ON(!ops)) 815 return NULL; 816 817 if (WARN_ON(!ops->set_block)) 818 return NULL; 819 820 if (WARN_ON(!name)) 821 return NULL; 822 823 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) 824 return NULL; 825 826 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); 827 if (!rfkill) 828 return NULL; 829 830 spin_lock_init(&rfkill->lock); 831 INIT_LIST_HEAD(&rfkill->node); 832 rfkill->type = type; 833 rfkill->name = name; 834 rfkill->ops = ops; 835 rfkill->data = ops_data; 836 837 dev = &rfkill->dev; 838 dev->class = &rfkill_class; 839 dev->parent = parent; 840 device_initialize(dev); 841 842 return rfkill; 843 } 844 EXPORT_SYMBOL(rfkill_alloc); 845 846 static void rfkill_poll(struct work_struct *work) 847 { 848 struct rfkill *rfkill; 849 850 rfkill = container_of(work, struct rfkill, poll_work.work); 851 852 /* 853 * Poll hardware state -- driver will use one of the 854 * rfkill_set{,_hw,_sw}_state functions and use its 855 * return value to update the current status. 856 */ 857 rfkill->ops->poll(rfkill, rfkill->data); 858 859 schedule_delayed_work(&rfkill->poll_work, 860 round_jiffies_relative(POLL_INTERVAL)); 861 } 862 863 static void rfkill_uevent_work(struct work_struct *work) 864 { 865 struct rfkill *rfkill; 866 867 rfkill = container_of(work, struct rfkill, uevent_work); 868 869 mutex_lock(&rfkill_global_mutex); 870 rfkill_event(rfkill); 871 mutex_unlock(&rfkill_global_mutex); 872 } 873 874 static void rfkill_sync_work(struct work_struct *work) 875 { 876 struct rfkill *rfkill; 877 bool cur; 878 879 rfkill = container_of(work, struct rfkill, sync_work); 880 881 mutex_lock(&rfkill_global_mutex); 882 cur = rfkill_global_states[rfkill->type].cur; 883 rfkill_set_block(rfkill, cur); 884 mutex_unlock(&rfkill_global_mutex); 885 } 886 887 int __must_check rfkill_register(struct rfkill *rfkill) 888 { 889 static unsigned long rfkill_no; 890 struct device *dev = &rfkill->dev; 891 int error; 892 893 BUG_ON(!rfkill); 894 895 mutex_lock(&rfkill_global_mutex); 896 897 if (rfkill->registered) { 898 error = -EALREADY; 899 goto unlock; 900 } 901 902 rfkill->idx = rfkill_no; 903 dev_set_name(dev, "rfkill%lu", rfkill_no); 904 rfkill_no++; 905 906 list_add_tail(&rfkill->node, &rfkill_list); 907 908 error = device_add(dev); 909 if (error) 910 goto remove; 911 912 error = rfkill_led_trigger_register(rfkill); 913 if (error) 914 goto devdel; 915 916 rfkill->registered = true; 917 918 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); 919 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); 920 INIT_WORK(&rfkill->sync_work, rfkill_sync_work); 921 922 if (rfkill->ops->poll) 923 schedule_delayed_work(&rfkill->poll_work, 924 round_jiffies_relative(POLL_INTERVAL)); 925 926 if (!rfkill->persistent || rfkill_epo_lock_active) { 927 schedule_work(&rfkill->sync_work); 928 } else { 929 #ifdef CONFIG_RFKILL_INPUT 930 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); 931 932 if (!atomic_read(&rfkill_input_disabled)) 933 __rfkill_switch_all(rfkill->type, soft_blocked); 934 #endif 935 } 936 937 rfkill_send_events(rfkill, RFKILL_OP_ADD); 938 939 mutex_unlock(&rfkill_global_mutex); 940 return 0; 941 942 devdel: 943 device_del(&rfkill->dev); 944 remove: 945 list_del_init(&rfkill->node); 946 unlock: 947 mutex_unlock(&rfkill_global_mutex); 948 return error; 949 } 950 EXPORT_SYMBOL(rfkill_register); 951 952 void rfkill_unregister(struct rfkill *rfkill) 953 { 954 BUG_ON(!rfkill); 955 956 if (rfkill->ops->poll) 957 cancel_delayed_work_sync(&rfkill->poll_work); 958 959 cancel_work_sync(&rfkill->uevent_work); 960 cancel_work_sync(&rfkill->sync_work); 961 962 rfkill->registered = false; 963 964 device_del(&rfkill->dev); 965 966 mutex_lock(&rfkill_global_mutex); 967 rfkill_send_events(rfkill, RFKILL_OP_DEL); 968 list_del_init(&rfkill->node); 969 mutex_unlock(&rfkill_global_mutex); 970 971 rfkill_led_trigger_unregister(rfkill); 972 } 973 EXPORT_SYMBOL(rfkill_unregister); 974 975 void rfkill_destroy(struct rfkill *rfkill) 976 { 977 if (rfkill) 978 put_device(&rfkill->dev); 979 } 980 EXPORT_SYMBOL(rfkill_destroy); 981 982 static int rfkill_fop_open(struct inode *inode, struct file *file) 983 { 984 struct rfkill_data *data; 985 struct rfkill *rfkill; 986 struct rfkill_int_event *ev, *tmp; 987 988 data = kzalloc(sizeof(*data), GFP_KERNEL); 989 if (!data) 990 return -ENOMEM; 991 992 INIT_LIST_HEAD(&data->events); 993 mutex_init(&data->mtx); 994 init_waitqueue_head(&data->read_wait); 995 996 mutex_lock(&rfkill_global_mutex); 997 mutex_lock(&data->mtx); 998 /* 999 * start getting events from elsewhere but hold mtx to get 1000 * startup events added first 1001 */ 1002 list_add(&data->list, &rfkill_fds); 1003 1004 list_for_each_entry(rfkill, &rfkill_list, node) { 1005 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 1006 if (!ev) 1007 goto free; 1008 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); 1009 list_add_tail(&ev->list, &data->events); 1010 } 1011 mutex_unlock(&data->mtx); 1012 mutex_unlock(&rfkill_global_mutex); 1013 1014 file->private_data = data; 1015 1016 return nonseekable_open(inode, file); 1017 1018 free: 1019 mutex_unlock(&data->mtx); 1020 mutex_unlock(&rfkill_global_mutex); 1021 mutex_destroy(&data->mtx); 1022 list_for_each_entry_safe(ev, tmp, &data->events, list) 1023 kfree(ev); 1024 kfree(data); 1025 return -ENOMEM; 1026 } 1027 1028 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) 1029 { 1030 struct rfkill_data *data = file->private_data; 1031 unsigned int res = POLLOUT | POLLWRNORM; 1032 1033 poll_wait(file, &data->read_wait, wait); 1034 1035 mutex_lock(&data->mtx); 1036 if (!list_empty(&data->events)) 1037 res = POLLIN | POLLRDNORM; 1038 mutex_unlock(&data->mtx); 1039 1040 return res; 1041 } 1042 1043 static bool rfkill_readable(struct rfkill_data *data) 1044 { 1045 bool r; 1046 1047 mutex_lock(&data->mtx); 1048 r = !list_empty(&data->events); 1049 mutex_unlock(&data->mtx); 1050 1051 return r; 1052 } 1053 1054 static ssize_t rfkill_fop_read(struct file *file, char __user *buf, 1055 size_t count, loff_t *pos) 1056 { 1057 struct rfkill_data *data = file->private_data; 1058 struct rfkill_int_event *ev; 1059 unsigned long sz; 1060 int ret; 1061 1062 mutex_lock(&data->mtx); 1063 1064 while (list_empty(&data->events)) { 1065 if (file->f_flags & O_NONBLOCK) { 1066 ret = -EAGAIN; 1067 goto out; 1068 } 1069 mutex_unlock(&data->mtx); 1070 ret = wait_event_interruptible(data->read_wait, 1071 rfkill_readable(data)); 1072 mutex_lock(&data->mtx); 1073 1074 if (ret) 1075 goto out; 1076 } 1077 1078 ev = list_first_entry(&data->events, struct rfkill_int_event, 1079 list); 1080 1081 sz = min_t(unsigned long, sizeof(ev->ev), count); 1082 ret = sz; 1083 if (copy_to_user(buf, &ev->ev, sz)) 1084 ret = -EFAULT; 1085 1086 list_del(&ev->list); 1087 kfree(ev); 1088 out: 1089 mutex_unlock(&data->mtx); 1090 return ret; 1091 } 1092 1093 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, 1094 size_t count, loff_t *pos) 1095 { 1096 struct rfkill *rfkill; 1097 struct rfkill_event ev; 1098 1099 /* we don't need the 'hard' variable but accept it */ 1100 if (count < RFKILL_EVENT_SIZE_V1 - 1) 1101 return -EINVAL; 1102 1103 /* 1104 * Copy as much data as we can accept into our 'ev' buffer, 1105 * but tell userspace how much we've copied so it can determine 1106 * our API version even in a write() call, if it cares. 1107 */ 1108 count = min(count, sizeof(ev)); 1109 if (copy_from_user(&ev, buf, count)) 1110 return -EFAULT; 1111 1112 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) 1113 return -EINVAL; 1114 1115 if (ev.type >= NUM_RFKILL_TYPES) 1116 return -EINVAL; 1117 1118 mutex_lock(&rfkill_global_mutex); 1119 1120 if (ev.op == RFKILL_OP_CHANGE_ALL) { 1121 if (ev.type == RFKILL_TYPE_ALL) { 1122 enum rfkill_type i; 1123 for (i = 0; i < NUM_RFKILL_TYPES; i++) 1124 rfkill_global_states[i].cur = ev.soft; 1125 } else { 1126 rfkill_global_states[ev.type].cur = ev.soft; 1127 } 1128 } 1129 1130 list_for_each_entry(rfkill, &rfkill_list, node) { 1131 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) 1132 continue; 1133 1134 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) 1135 continue; 1136 1137 rfkill_set_block(rfkill, ev.soft); 1138 } 1139 mutex_unlock(&rfkill_global_mutex); 1140 1141 return count; 1142 } 1143 1144 static int rfkill_fop_release(struct inode *inode, struct file *file) 1145 { 1146 struct rfkill_data *data = file->private_data; 1147 struct rfkill_int_event *ev, *tmp; 1148 1149 mutex_lock(&rfkill_global_mutex); 1150 list_del(&data->list); 1151 mutex_unlock(&rfkill_global_mutex); 1152 1153 mutex_destroy(&data->mtx); 1154 list_for_each_entry_safe(ev, tmp, &data->events, list) 1155 kfree(ev); 1156 1157 #ifdef CONFIG_RFKILL_INPUT 1158 if (data->input_handler) 1159 if (atomic_dec_return(&rfkill_input_disabled) == 0) 1160 printk(KERN_DEBUG "rfkill: input handler enabled\n"); 1161 #endif 1162 1163 kfree(data); 1164 1165 return 0; 1166 } 1167 1168 #ifdef CONFIG_RFKILL_INPUT 1169 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, 1170 unsigned long arg) 1171 { 1172 struct rfkill_data *data = file->private_data; 1173 1174 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) 1175 return -ENOSYS; 1176 1177 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) 1178 return -ENOSYS; 1179 1180 mutex_lock(&data->mtx); 1181 1182 if (!data->input_handler) { 1183 if (atomic_inc_return(&rfkill_input_disabled) == 1) 1184 printk(KERN_DEBUG "rfkill: input handler disabled\n"); 1185 data->input_handler = true; 1186 } 1187 1188 mutex_unlock(&data->mtx); 1189 1190 return 0; 1191 } 1192 #endif 1193 1194 static const struct file_operations rfkill_fops = { 1195 .owner = THIS_MODULE, 1196 .open = rfkill_fop_open, 1197 .read = rfkill_fop_read, 1198 .write = rfkill_fop_write, 1199 .poll = rfkill_fop_poll, 1200 .release = rfkill_fop_release, 1201 #ifdef CONFIG_RFKILL_INPUT 1202 .unlocked_ioctl = rfkill_fop_ioctl, 1203 .compat_ioctl = rfkill_fop_ioctl, 1204 #endif 1205 }; 1206 1207 static struct miscdevice rfkill_miscdev = { 1208 .name = "rfkill", 1209 .fops = &rfkill_fops, 1210 .minor = MISC_DYNAMIC_MINOR, 1211 }; 1212 1213 static int __init rfkill_init(void) 1214 { 1215 int error; 1216 int i; 1217 1218 for (i = 0; i < NUM_RFKILL_TYPES; i++) 1219 rfkill_global_states[i].cur = !rfkill_default_state; 1220 1221 error = class_register(&rfkill_class); 1222 if (error) 1223 goto out; 1224 1225 error = misc_register(&rfkill_miscdev); 1226 if (error) { 1227 class_unregister(&rfkill_class); 1228 goto out; 1229 } 1230 1231 #ifdef CONFIG_RFKILL_INPUT 1232 error = rfkill_handler_init(); 1233 if (error) { 1234 misc_deregister(&rfkill_miscdev); 1235 class_unregister(&rfkill_class); 1236 goto out; 1237 } 1238 #endif 1239 1240 out: 1241 return error; 1242 } 1243 subsys_initcall(rfkill_init); 1244 1245 static void __exit rfkill_exit(void) 1246 { 1247 #ifdef CONFIG_RFKILL_INPUT 1248 rfkill_handler_exit(); 1249 #endif 1250 misc_deregister(&rfkill_miscdev); 1251 class_unregister(&rfkill_class); 1252 } 1253 module_exit(rfkill_exit); 1254