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/device.h> 33 #include <linux/miscdevice.h> 34 #include <linux/wait.h> 35 #include <linux/poll.h> 36 #include <linux/fs.h> 37 #include <linux/slab.h> 38 39 #include "rfkill.h" 40 41 #define POLL_INTERVAL (5 * HZ) 42 43 #define RFKILL_BLOCK_HW BIT(0) 44 #define RFKILL_BLOCK_SW BIT(1) 45 #define RFKILL_BLOCK_SW_PREV BIT(2) 46 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\ 47 RFKILL_BLOCK_SW |\ 48 RFKILL_BLOCK_SW_PREV) 49 #define RFKILL_BLOCK_SW_SETCALL BIT(31) 50 51 struct rfkill { 52 spinlock_t lock; 53 54 const char *name; 55 enum rfkill_type type; 56 57 unsigned long state; 58 59 u32 idx; 60 61 bool registered; 62 bool persistent; 63 64 const struct rfkill_ops *ops; 65 void *data; 66 67 #ifdef CONFIG_RFKILL_LEDS 68 struct led_trigger led_trigger; 69 const char *ledtrigname; 70 #endif 71 72 struct device dev; 73 struct list_head node; 74 75 struct delayed_work poll_work; 76 struct work_struct uevent_work; 77 struct work_struct sync_work; 78 }; 79 #define to_rfkill(d) container_of(d, struct rfkill, dev) 80 81 struct rfkill_int_event { 82 struct list_head list; 83 struct rfkill_event ev; 84 }; 85 86 struct rfkill_data { 87 struct list_head list; 88 struct list_head events; 89 struct mutex mtx; 90 wait_queue_head_t read_wait; 91 bool input_handler; 92 }; 93 94 95 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); 96 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); 97 MODULE_DESCRIPTION("RF switch support"); 98 MODULE_LICENSE("GPL"); 99 100 101 /* 102 * The locking here should be made much smarter, we currently have 103 * a bit of a stupid situation because drivers might want to register 104 * the rfkill struct under their own lock, and take this lock during 105 * rfkill method calls -- which will cause an AB-BA deadlock situation. 106 * 107 * To fix that, we need to rework this code here to be mostly lock-free 108 * and only use the mutex for list manipulations, not to protect the 109 * various other global variables. Then we can avoid holding the mutex 110 * around driver operations, and all is happy. 111 */ 112 static LIST_HEAD(rfkill_list); /* list of registered rf switches */ 113 static DEFINE_MUTEX(rfkill_global_mutex); 114 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ 115 116 static unsigned int rfkill_default_state = 1; 117 module_param_named(default_state, rfkill_default_state, uint, 0444); 118 MODULE_PARM_DESC(default_state, 119 "Default initial state for all radio types, 0 = radio off"); 120 121 static struct { 122 bool cur, sav; 123 } rfkill_global_states[NUM_RFKILL_TYPES]; 124 125 static bool rfkill_epo_lock_active; 126 127 128 #ifdef CONFIG_RFKILL_LEDS 129 static void rfkill_led_trigger_event(struct rfkill *rfkill) 130 { 131 struct led_trigger *trigger; 132 133 if (!rfkill->registered) 134 return; 135 136 trigger = &rfkill->led_trigger; 137 138 if (rfkill->state & RFKILL_BLOCK_ANY) 139 led_trigger_event(trigger, LED_OFF); 140 else 141 led_trigger_event(trigger, LED_FULL); 142 } 143 144 static void rfkill_led_trigger_activate(struct led_classdev *led) 145 { 146 struct rfkill *rfkill; 147 148 rfkill = container_of(led->trigger, struct rfkill, led_trigger); 149 150 rfkill_led_trigger_event(rfkill); 151 } 152 153 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) 154 { 155 return rfkill->led_trigger.name; 156 } 157 EXPORT_SYMBOL(rfkill_get_led_trigger_name); 158 159 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) 160 { 161 BUG_ON(!rfkill); 162 163 rfkill->ledtrigname = name; 164 } 165 EXPORT_SYMBOL(rfkill_set_led_trigger_name); 166 167 static int rfkill_led_trigger_register(struct rfkill *rfkill) 168 { 169 rfkill->led_trigger.name = rfkill->ledtrigname 170 ? : dev_name(&rfkill->dev); 171 rfkill->led_trigger.activate = rfkill_led_trigger_activate; 172 return led_trigger_register(&rfkill->led_trigger); 173 } 174 175 static void rfkill_led_trigger_unregister(struct rfkill *rfkill) 176 { 177 led_trigger_unregister(&rfkill->led_trigger); 178 } 179 #else 180 static void rfkill_led_trigger_event(struct rfkill *rfkill) 181 { 182 } 183 184 static inline int rfkill_led_trigger_register(struct rfkill *rfkill) 185 { 186 return 0; 187 } 188 189 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) 190 { 191 } 192 #endif /* CONFIG_RFKILL_LEDS */ 193 194 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, 195 enum rfkill_operation op) 196 { 197 unsigned long flags; 198 199 ev->idx = rfkill->idx; 200 ev->type = rfkill->type; 201 ev->op = op; 202 203 spin_lock_irqsave(&rfkill->lock, flags); 204 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); 205 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | 206 RFKILL_BLOCK_SW_PREV)); 207 spin_unlock_irqrestore(&rfkill->lock, flags); 208 } 209 210 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) 211 { 212 struct rfkill_data *data; 213 struct rfkill_int_event *ev; 214 215 list_for_each_entry(data, &rfkill_fds, list) { 216 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 217 if (!ev) 218 continue; 219 rfkill_fill_event(&ev->ev, rfkill, op); 220 mutex_lock(&data->mtx); 221 list_add_tail(&ev->list, &data->events); 222 mutex_unlock(&data->mtx); 223 wake_up_interruptible(&data->read_wait); 224 } 225 } 226 227 static void rfkill_event(struct rfkill *rfkill) 228 { 229 if (!rfkill->registered) 230 return; 231 232 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); 233 234 /* also send event to /dev/rfkill */ 235 rfkill_send_events(rfkill, RFKILL_OP_CHANGE); 236 } 237 238 static bool __rfkill_set_hw_state(struct rfkill *rfkill, 239 bool blocked, bool *change) 240 { 241 unsigned long flags; 242 bool prev, any; 243 244 BUG_ON(!rfkill); 245 246 spin_lock_irqsave(&rfkill->lock, flags); 247 prev = !!(rfkill->state & RFKILL_BLOCK_HW); 248 if (blocked) 249 rfkill->state |= RFKILL_BLOCK_HW; 250 else 251 rfkill->state &= ~RFKILL_BLOCK_HW; 252 *change = prev != blocked; 253 any = !!(rfkill->state & RFKILL_BLOCK_ANY); 254 spin_unlock_irqrestore(&rfkill->lock, flags); 255 256 rfkill_led_trigger_event(rfkill); 257 258 return any; 259 } 260 261 /** 262 * rfkill_set_block - wrapper for set_block method 263 * 264 * @rfkill: the rfkill struct to use 265 * @blocked: the new software state 266 * 267 * Calls the set_block method (when applicable) and handles notifications 268 * etc. as well. 269 */ 270 static void rfkill_set_block(struct rfkill *rfkill, bool blocked) 271 { 272 unsigned long flags; 273 bool prev, curr; 274 int err; 275 276 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) 277 return; 278 279 /* 280 * Some platforms (...!) generate input events which affect the 281 * _hard_ kill state -- whenever something tries to change the 282 * current software state query the hardware state too. 283 */ 284 if (rfkill->ops->query) 285 rfkill->ops->query(rfkill, rfkill->data); 286 287 spin_lock_irqsave(&rfkill->lock, flags); 288 prev = rfkill->state & RFKILL_BLOCK_SW; 289 290 if (rfkill->state & RFKILL_BLOCK_SW) 291 rfkill->state |= RFKILL_BLOCK_SW_PREV; 292 else 293 rfkill->state &= ~RFKILL_BLOCK_SW_PREV; 294 295 if (blocked) 296 rfkill->state |= RFKILL_BLOCK_SW; 297 else 298 rfkill->state &= ~RFKILL_BLOCK_SW; 299 300 rfkill->state |= RFKILL_BLOCK_SW_SETCALL; 301 spin_unlock_irqrestore(&rfkill->lock, flags); 302 303 err = rfkill->ops->set_block(rfkill->data, blocked); 304 305 spin_lock_irqsave(&rfkill->lock, flags); 306 if (err) { 307 /* 308 * Failed -- reset status to _prev, this may be different 309 * from what set set _PREV to earlier in this function 310 * if rfkill_set_sw_state was invoked. 311 */ 312 if (rfkill->state & RFKILL_BLOCK_SW_PREV) 313 rfkill->state |= RFKILL_BLOCK_SW; 314 else 315 rfkill->state &= ~RFKILL_BLOCK_SW; 316 } 317 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; 318 rfkill->state &= ~RFKILL_BLOCK_SW_PREV; 319 curr = rfkill->state & RFKILL_BLOCK_SW; 320 spin_unlock_irqrestore(&rfkill->lock, flags); 321 322 rfkill_led_trigger_event(rfkill); 323 324 if (prev != curr) 325 rfkill_event(rfkill); 326 } 327 328 #ifdef CONFIG_RFKILL_INPUT 329 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); 330 331 /** 332 * __rfkill_switch_all - Toggle state of all switches of given type 333 * @type: type of interfaces to be affected 334 * @state: the new state 335 * 336 * This function sets the state of all switches of given type, 337 * unless a specific switch is claimed by userspace (in which case, 338 * that switch is left alone) or suspended. 339 * 340 * Caller must have acquired rfkill_global_mutex. 341 */ 342 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) 343 { 344 struct rfkill *rfkill; 345 346 rfkill_global_states[type].cur = blocked; 347 list_for_each_entry(rfkill, &rfkill_list, node) { 348 if (rfkill->type != type && type != RFKILL_TYPE_ALL) 349 continue; 350 351 rfkill_set_block(rfkill, blocked); 352 } 353 } 354 355 /** 356 * rfkill_switch_all - Toggle state of all switches of given type 357 * @type: type of interfaces to be affected 358 * @state: the new state 359 * 360 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). 361 * Please refer to __rfkill_switch_all() for details. 362 * 363 * Does nothing if the EPO lock is active. 364 */ 365 void rfkill_switch_all(enum rfkill_type type, bool blocked) 366 { 367 if (atomic_read(&rfkill_input_disabled)) 368 return; 369 370 mutex_lock(&rfkill_global_mutex); 371 372 if (!rfkill_epo_lock_active) 373 __rfkill_switch_all(type, blocked); 374 375 mutex_unlock(&rfkill_global_mutex); 376 } 377 378 /** 379 * rfkill_epo - emergency power off all transmitters 380 * 381 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, 382 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. 383 * 384 * The global state before the EPO is saved and can be restored later 385 * using rfkill_restore_states(). 386 */ 387 void rfkill_epo(void) 388 { 389 struct rfkill *rfkill; 390 int i; 391 392 if (atomic_read(&rfkill_input_disabled)) 393 return; 394 395 mutex_lock(&rfkill_global_mutex); 396 397 rfkill_epo_lock_active = true; 398 list_for_each_entry(rfkill, &rfkill_list, node) 399 rfkill_set_block(rfkill, true); 400 401 for (i = 0; i < NUM_RFKILL_TYPES; i++) { 402 rfkill_global_states[i].sav = rfkill_global_states[i].cur; 403 rfkill_global_states[i].cur = true; 404 } 405 406 mutex_unlock(&rfkill_global_mutex); 407 } 408 409 /** 410 * rfkill_restore_states - restore global states 411 * 412 * Restore (and sync switches to) the global state from the 413 * states in rfkill_default_states. This can undo the effects of 414 * a call to rfkill_epo(). 415 */ 416 void rfkill_restore_states(void) 417 { 418 int i; 419 420 if (atomic_read(&rfkill_input_disabled)) 421 return; 422 423 mutex_lock(&rfkill_global_mutex); 424 425 rfkill_epo_lock_active = false; 426 for (i = 0; i < NUM_RFKILL_TYPES; i++) 427 __rfkill_switch_all(i, rfkill_global_states[i].sav); 428 mutex_unlock(&rfkill_global_mutex); 429 } 430 431 /** 432 * rfkill_remove_epo_lock - unlock state changes 433 * 434 * Used by rfkill-input manually unlock state changes, when 435 * the EPO switch is deactivated. 436 */ 437 void rfkill_remove_epo_lock(void) 438 { 439 if (atomic_read(&rfkill_input_disabled)) 440 return; 441 442 mutex_lock(&rfkill_global_mutex); 443 rfkill_epo_lock_active = false; 444 mutex_unlock(&rfkill_global_mutex); 445 } 446 447 /** 448 * rfkill_is_epo_lock_active - returns true EPO is active 449 * 450 * Returns 0 (false) if there is NOT an active EPO contidion, 451 * and 1 (true) if there is an active EPO contition, which 452 * locks all radios in one of the BLOCKED states. 453 * 454 * Can be called in atomic context. 455 */ 456 bool rfkill_is_epo_lock_active(void) 457 { 458 return rfkill_epo_lock_active; 459 } 460 461 /** 462 * rfkill_get_global_sw_state - returns global state for a type 463 * @type: the type to get the global state of 464 * 465 * Returns the current global state for a given wireless 466 * device type. 467 */ 468 bool rfkill_get_global_sw_state(const enum rfkill_type type) 469 { 470 return rfkill_global_states[type].cur; 471 } 472 #endif 473 474 475 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) 476 { 477 bool ret, change; 478 479 ret = __rfkill_set_hw_state(rfkill, blocked, &change); 480 481 if (!rfkill->registered) 482 return ret; 483 484 if (change) 485 schedule_work(&rfkill->uevent_work); 486 487 return ret; 488 } 489 EXPORT_SYMBOL(rfkill_set_hw_state); 490 491 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) 492 { 493 u32 bit = RFKILL_BLOCK_SW; 494 495 /* if in a ops->set_block right now, use other bit */ 496 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) 497 bit = RFKILL_BLOCK_SW_PREV; 498 499 if (blocked) 500 rfkill->state |= bit; 501 else 502 rfkill->state &= ~bit; 503 } 504 505 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) 506 { 507 unsigned long flags; 508 bool prev, hwblock; 509 510 BUG_ON(!rfkill); 511 512 spin_lock_irqsave(&rfkill->lock, flags); 513 prev = !!(rfkill->state & RFKILL_BLOCK_SW); 514 __rfkill_set_sw_state(rfkill, blocked); 515 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); 516 blocked = blocked || hwblock; 517 spin_unlock_irqrestore(&rfkill->lock, flags); 518 519 if (!rfkill->registered) 520 return blocked; 521 522 if (prev != blocked && !hwblock) 523 schedule_work(&rfkill->uevent_work); 524 525 rfkill_led_trigger_event(rfkill); 526 527 return blocked; 528 } 529 EXPORT_SYMBOL(rfkill_set_sw_state); 530 531 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) 532 { 533 unsigned long flags; 534 535 BUG_ON(!rfkill); 536 BUG_ON(rfkill->registered); 537 538 spin_lock_irqsave(&rfkill->lock, flags); 539 __rfkill_set_sw_state(rfkill, blocked); 540 rfkill->persistent = true; 541 spin_unlock_irqrestore(&rfkill->lock, flags); 542 } 543 EXPORT_SYMBOL(rfkill_init_sw_state); 544 545 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) 546 { 547 unsigned long flags; 548 bool swprev, hwprev; 549 550 BUG_ON(!rfkill); 551 552 spin_lock_irqsave(&rfkill->lock, flags); 553 554 /* 555 * No need to care about prev/setblock ... this is for uevent only 556 * and that will get triggered by rfkill_set_block anyway. 557 */ 558 swprev = !!(rfkill->state & RFKILL_BLOCK_SW); 559 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); 560 __rfkill_set_sw_state(rfkill, sw); 561 if (hw) 562 rfkill->state |= RFKILL_BLOCK_HW; 563 else 564 rfkill->state &= ~RFKILL_BLOCK_HW; 565 566 spin_unlock_irqrestore(&rfkill->lock, flags); 567 568 if (!rfkill->registered) { 569 rfkill->persistent = true; 570 } else { 571 if (swprev != sw || hwprev != hw) 572 schedule_work(&rfkill->uevent_work); 573 574 rfkill_led_trigger_event(rfkill); 575 } 576 } 577 EXPORT_SYMBOL(rfkill_set_states); 578 579 static ssize_t rfkill_name_show(struct device *dev, 580 struct device_attribute *attr, 581 char *buf) 582 { 583 struct rfkill *rfkill = to_rfkill(dev); 584 585 return sprintf(buf, "%s\n", rfkill->name); 586 } 587 588 static const char *rfkill_get_type_str(enum rfkill_type type) 589 { 590 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1); 591 592 switch (type) { 593 case RFKILL_TYPE_WLAN: 594 return "wlan"; 595 case RFKILL_TYPE_BLUETOOTH: 596 return "bluetooth"; 597 case RFKILL_TYPE_UWB: 598 return "ultrawideband"; 599 case RFKILL_TYPE_WIMAX: 600 return "wimax"; 601 case RFKILL_TYPE_WWAN: 602 return "wwan"; 603 case RFKILL_TYPE_GPS: 604 return "gps"; 605 case RFKILL_TYPE_FM: 606 return "fm"; 607 default: 608 BUG(); 609 } 610 } 611 612 static ssize_t rfkill_type_show(struct device *dev, 613 struct device_attribute *attr, 614 char *buf) 615 { 616 struct rfkill *rfkill = to_rfkill(dev); 617 618 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); 619 } 620 621 static ssize_t rfkill_idx_show(struct device *dev, 622 struct device_attribute *attr, 623 char *buf) 624 { 625 struct rfkill *rfkill = to_rfkill(dev); 626 627 return sprintf(buf, "%d\n", rfkill->idx); 628 } 629 630 static ssize_t rfkill_persistent_show(struct device *dev, 631 struct device_attribute *attr, 632 char *buf) 633 { 634 struct rfkill *rfkill = to_rfkill(dev); 635 636 return sprintf(buf, "%d\n", rfkill->persistent); 637 } 638 639 static ssize_t rfkill_hard_show(struct device *dev, 640 struct device_attribute *attr, 641 char *buf) 642 { 643 struct rfkill *rfkill = to_rfkill(dev); 644 645 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 ); 646 } 647 648 static ssize_t rfkill_soft_show(struct device *dev, 649 struct device_attribute *attr, 650 char *buf) 651 { 652 struct rfkill *rfkill = to_rfkill(dev); 653 654 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); 655 } 656 657 static ssize_t rfkill_soft_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 = kstrtoul(buf, 0, &state); 669 if (err) 670 return err; 671 672 if (state > 1 ) 673 return -EINVAL; 674 675 mutex_lock(&rfkill_global_mutex); 676 rfkill_set_block(rfkill, state); 677 mutex_unlock(&rfkill_global_mutex); 678 679 return count; 680 } 681 682 static u8 user_state_from_blocked(unsigned long state) 683 { 684 if (state & RFKILL_BLOCK_HW) 685 return RFKILL_USER_STATE_HARD_BLOCKED; 686 if (state & RFKILL_BLOCK_SW) 687 return RFKILL_USER_STATE_SOFT_BLOCKED; 688 689 return RFKILL_USER_STATE_UNBLOCKED; 690 } 691 692 static ssize_t rfkill_state_show(struct device *dev, 693 struct device_attribute *attr, 694 char *buf) 695 { 696 struct rfkill *rfkill = to_rfkill(dev); 697 698 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); 699 } 700 701 static ssize_t rfkill_state_store(struct device *dev, 702 struct device_attribute *attr, 703 const char *buf, size_t count) 704 { 705 struct rfkill *rfkill = to_rfkill(dev); 706 unsigned long state; 707 int err; 708 709 if (!capable(CAP_NET_ADMIN)) 710 return -EPERM; 711 712 err = kstrtoul(buf, 0, &state); 713 if (err) 714 return err; 715 716 if (state != RFKILL_USER_STATE_SOFT_BLOCKED && 717 state != RFKILL_USER_STATE_UNBLOCKED) 718 return -EINVAL; 719 720 mutex_lock(&rfkill_global_mutex); 721 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); 722 mutex_unlock(&rfkill_global_mutex); 723 724 return count; 725 } 726 727 static ssize_t rfkill_claim_show(struct device *dev, 728 struct device_attribute *attr, 729 char *buf) 730 { 731 return sprintf(buf, "%d\n", 0); 732 } 733 734 static ssize_t rfkill_claim_store(struct device *dev, 735 struct device_attribute *attr, 736 const char *buf, size_t count) 737 { 738 return -EOPNOTSUPP; 739 } 740 741 static struct device_attribute rfkill_dev_attrs[] = { 742 __ATTR(name, S_IRUGO, rfkill_name_show, NULL), 743 __ATTR(type, S_IRUGO, rfkill_type_show, NULL), 744 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL), 745 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL), 746 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), 747 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), 748 __ATTR(soft, S_IRUGO|S_IWUSR, rfkill_soft_show, rfkill_soft_store), 749 __ATTR(hard, S_IRUGO, rfkill_hard_show, NULL), 750 __ATTR_NULL 751 }; 752 753 static void rfkill_release(struct device *dev) 754 { 755 struct rfkill *rfkill = to_rfkill(dev); 756 757 kfree(rfkill); 758 } 759 760 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) 761 { 762 struct rfkill *rfkill = to_rfkill(dev); 763 unsigned long flags; 764 u32 state; 765 int error; 766 767 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); 768 if (error) 769 return error; 770 error = add_uevent_var(env, "RFKILL_TYPE=%s", 771 rfkill_get_type_str(rfkill->type)); 772 if (error) 773 return error; 774 spin_lock_irqsave(&rfkill->lock, flags); 775 state = rfkill->state; 776 spin_unlock_irqrestore(&rfkill->lock, flags); 777 error = add_uevent_var(env, "RFKILL_STATE=%d", 778 user_state_from_blocked(state)); 779 return error; 780 } 781 782 void rfkill_pause_polling(struct rfkill *rfkill) 783 { 784 BUG_ON(!rfkill); 785 786 if (!rfkill->ops->poll) 787 return; 788 789 cancel_delayed_work_sync(&rfkill->poll_work); 790 } 791 EXPORT_SYMBOL(rfkill_pause_polling); 792 793 void rfkill_resume_polling(struct rfkill *rfkill) 794 { 795 BUG_ON(!rfkill); 796 797 if (!rfkill->ops->poll) 798 return; 799 800 schedule_work(&rfkill->poll_work.work); 801 } 802 EXPORT_SYMBOL(rfkill_resume_polling); 803 804 static int rfkill_suspend(struct device *dev, pm_message_t state) 805 { 806 struct rfkill *rfkill = to_rfkill(dev); 807 808 rfkill_pause_polling(rfkill); 809 810 return 0; 811 } 812 813 static int rfkill_resume(struct device *dev) 814 { 815 struct rfkill *rfkill = to_rfkill(dev); 816 bool cur; 817 818 if (!rfkill->persistent) { 819 cur = !!(rfkill->state & RFKILL_BLOCK_SW); 820 rfkill_set_block(rfkill, cur); 821 } 822 823 rfkill_resume_polling(rfkill); 824 825 return 0; 826 } 827 828 static struct class rfkill_class = { 829 .name = "rfkill", 830 .dev_release = rfkill_release, 831 .dev_attrs = rfkill_dev_attrs, 832 .dev_uevent = rfkill_dev_uevent, 833 .suspend = rfkill_suspend, 834 .resume = rfkill_resume, 835 }; 836 837 bool rfkill_blocked(struct rfkill *rfkill) 838 { 839 unsigned long flags; 840 u32 state; 841 842 spin_lock_irqsave(&rfkill->lock, flags); 843 state = rfkill->state; 844 spin_unlock_irqrestore(&rfkill->lock, flags); 845 846 return !!(state & RFKILL_BLOCK_ANY); 847 } 848 EXPORT_SYMBOL(rfkill_blocked); 849 850 851 struct rfkill * __must_check rfkill_alloc(const char *name, 852 struct device *parent, 853 const enum rfkill_type type, 854 const struct rfkill_ops *ops, 855 void *ops_data) 856 { 857 struct rfkill *rfkill; 858 struct device *dev; 859 860 if (WARN_ON(!ops)) 861 return NULL; 862 863 if (WARN_ON(!ops->set_block)) 864 return NULL; 865 866 if (WARN_ON(!name)) 867 return NULL; 868 869 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) 870 return NULL; 871 872 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); 873 if (!rfkill) 874 return NULL; 875 876 spin_lock_init(&rfkill->lock); 877 INIT_LIST_HEAD(&rfkill->node); 878 rfkill->type = type; 879 rfkill->name = name; 880 rfkill->ops = ops; 881 rfkill->data = ops_data; 882 883 dev = &rfkill->dev; 884 dev->class = &rfkill_class; 885 dev->parent = parent; 886 device_initialize(dev); 887 888 return rfkill; 889 } 890 EXPORT_SYMBOL(rfkill_alloc); 891 892 static void rfkill_poll(struct work_struct *work) 893 { 894 struct rfkill *rfkill; 895 896 rfkill = container_of(work, struct rfkill, poll_work.work); 897 898 /* 899 * Poll hardware state -- driver will use one of the 900 * rfkill_set{,_hw,_sw}_state functions and use its 901 * return value to update the current status. 902 */ 903 rfkill->ops->poll(rfkill, rfkill->data); 904 905 schedule_delayed_work(&rfkill->poll_work, 906 round_jiffies_relative(POLL_INTERVAL)); 907 } 908 909 static void rfkill_uevent_work(struct work_struct *work) 910 { 911 struct rfkill *rfkill; 912 913 rfkill = container_of(work, struct rfkill, uevent_work); 914 915 mutex_lock(&rfkill_global_mutex); 916 rfkill_event(rfkill); 917 mutex_unlock(&rfkill_global_mutex); 918 } 919 920 static void rfkill_sync_work(struct work_struct *work) 921 { 922 struct rfkill *rfkill; 923 bool cur; 924 925 rfkill = container_of(work, struct rfkill, sync_work); 926 927 mutex_lock(&rfkill_global_mutex); 928 cur = rfkill_global_states[rfkill->type].cur; 929 rfkill_set_block(rfkill, cur); 930 mutex_unlock(&rfkill_global_mutex); 931 } 932 933 int __must_check rfkill_register(struct rfkill *rfkill) 934 { 935 static unsigned long rfkill_no; 936 struct device *dev = &rfkill->dev; 937 int error; 938 939 BUG_ON(!rfkill); 940 941 mutex_lock(&rfkill_global_mutex); 942 943 if (rfkill->registered) { 944 error = -EALREADY; 945 goto unlock; 946 } 947 948 rfkill->idx = rfkill_no; 949 dev_set_name(dev, "rfkill%lu", rfkill_no); 950 rfkill_no++; 951 952 list_add_tail(&rfkill->node, &rfkill_list); 953 954 error = device_add(dev); 955 if (error) 956 goto remove; 957 958 error = rfkill_led_trigger_register(rfkill); 959 if (error) 960 goto devdel; 961 962 rfkill->registered = true; 963 964 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); 965 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); 966 INIT_WORK(&rfkill->sync_work, rfkill_sync_work); 967 968 if (rfkill->ops->poll) 969 schedule_delayed_work(&rfkill->poll_work, 970 round_jiffies_relative(POLL_INTERVAL)); 971 972 if (!rfkill->persistent || rfkill_epo_lock_active) { 973 schedule_work(&rfkill->sync_work); 974 } else { 975 #ifdef CONFIG_RFKILL_INPUT 976 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); 977 978 if (!atomic_read(&rfkill_input_disabled)) 979 __rfkill_switch_all(rfkill->type, soft_blocked); 980 #endif 981 } 982 983 rfkill_send_events(rfkill, RFKILL_OP_ADD); 984 985 mutex_unlock(&rfkill_global_mutex); 986 return 0; 987 988 devdel: 989 device_del(&rfkill->dev); 990 remove: 991 list_del_init(&rfkill->node); 992 unlock: 993 mutex_unlock(&rfkill_global_mutex); 994 return error; 995 } 996 EXPORT_SYMBOL(rfkill_register); 997 998 void rfkill_unregister(struct rfkill *rfkill) 999 { 1000 BUG_ON(!rfkill); 1001 1002 if (rfkill->ops->poll) 1003 cancel_delayed_work_sync(&rfkill->poll_work); 1004 1005 cancel_work_sync(&rfkill->uevent_work); 1006 cancel_work_sync(&rfkill->sync_work); 1007 1008 rfkill->registered = false; 1009 1010 device_del(&rfkill->dev); 1011 1012 mutex_lock(&rfkill_global_mutex); 1013 rfkill_send_events(rfkill, RFKILL_OP_DEL); 1014 list_del_init(&rfkill->node); 1015 mutex_unlock(&rfkill_global_mutex); 1016 1017 rfkill_led_trigger_unregister(rfkill); 1018 } 1019 EXPORT_SYMBOL(rfkill_unregister); 1020 1021 void rfkill_destroy(struct rfkill *rfkill) 1022 { 1023 if (rfkill) 1024 put_device(&rfkill->dev); 1025 } 1026 EXPORT_SYMBOL(rfkill_destroy); 1027 1028 static int rfkill_fop_open(struct inode *inode, struct file *file) 1029 { 1030 struct rfkill_data *data; 1031 struct rfkill *rfkill; 1032 struct rfkill_int_event *ev, *tmp; 1033 1034 data = kzalloc(sizeof(*data), GFP_KERNEL); 1035 if (!data) 1036 return -ENOMEM; 1037 1038 INIT_LIST_HEAD(&data->events); 1039 mutex_init(&data->mtx); 1040 init_waitqueue_head(&data->read_wait); 1041 1042 mutex_lock(&rfkill_global_mutex); 1043 mutex_lock(&data->mtx); 1044 /* 1045 * start getting events from elsewhere but hold mtx to get 1046 * startup events added first 1047 */ 1048 1049 list_for_each_entry(rfkill, &rfkill_list, node) { 1050 ev = kzalloc(sizeof(*ev), GFP_KERNEL); 1051 if (!ev) 1052 goto free; 1053 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); 1054 list_add_tail(&ev->list, &data->events); 1055 } 1056 list_add(&data->list, &rfkill_fds); 1057 mutex_unlock(&data->mtx); 1058 mutex_unlock(&rfkill_global_mutex); 1059 1060 file->private_data = data; 1061 1062 return nonseekable_open(inode, file); 1063 1064 free: 1065 mutex_unlock(&data->mtx); 1066 mutex_unlock(&rfkill_global_mutex); 1067 mutex_destroy(&data->mtx); 1068 list_for_each_entry_safe(ev, tmp, &data->events, list) 1069 kfree(ev); 1070 kfree(data); 1071 return -ENOMEM; 1072 } 1073 1074 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) 1075 { 1076 struct rfkill_data *data = file->private_data; 1077 unsigned int res = POLLOUT | POLLWRNORM; 1078 1079 poll_wait(file, &data->read_wait, wait); 1080 1081 mutex_lock(&data->mtx); 1082 if (!list_empty(&data->events)) 1083 res = POLLIN | POLLRDNORM; 1084 mutex_unlock(&data->mtx); 1085 1086 return res; 1087 } 1088 1089 static bool rfkill_readable(struct rfkill_data *data) 1090 { 1091 bool r; 1092 1093 mutex_lock(&data->mtx); 1094 r = !list_empty(&data->events); 1095 mutex_unlock(&data->mtx); 1096 1097 return r; 1098 } 1099 1100 static ssize_t rfkill_fop_read(struct file *file, char __user *buf, 1101 size_t count, loff_t *pos) 1102 { 1103 struct rfkill_data *data = file->private_data; 1104 struct rfkill_int_event *ev; 1105 unsigned long sz; 1106 int ret; 1107 1108 mutex_lock(&data->mtx); 1109 1110 while (list_empty(&data->events)) { 1111 if (file->f_flags & O_NONBLOCK) { 1112 ret = -EAGAIN; 1113 goto out; 1114 } 1115 mutex_unlock(&data->mtx); 1116 ret = wait_event_interruptible(data->read_wait, 1117 rfkill_readable(data)); 1118 mutex_lock(&data->mtx); 1119 1120 if (ret) 1121 goto out; 1122 } 1123 1124 ev = list_first_entry(&data->events, struct rfkill_int_event, 1125 list); 1126 1127 sz = min_t(unsigned long, sizeof(ev->ev), count); 1128 ret = sz; 1129 if (copy_to_user(buf, &ev->ev, sz)) 1130 ret = -EFAULT; 1131 1132 list_del(&ev->list); 1133 kfree(ev); 1134 out: 1135 mutex_unlock(&data->mtx); 1136 return ret; 1137 } 1138 1139 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, 1140 size_t count, loff_t *pos) 1141 { 1142 struct rfkill *rfkill; 1143 struct rfkill_event ev; 1144 1145 /* we don't need the 'hard' variable but accept it */ 1146 if (count < RFKILL_EVENT_SIZE_V1 - 1) 1147 return -EINVAL; 1148 1149 /* 1150 * Copy as much data as we can accept into our 'ev' buffer, 1151 * but tell userspace how much we've copied so it can determine 1152 * our API version even in a write() call, if it cares. 1153 */ 1154 count = min(count, sizeof(ev)); 1155 if (copy_from_user(&ev, buf, count)) 1156 return -EFAULT; 1157 1158 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) 1159 return -EINVAL; 1160 1161 if (ev.type >= NUM_RFKILL_TYPES) 1162 return -EINVAL; 1163 1164 mutex_lock(&rfkill_global_mutex); 1165 1166 if (ev.op == RFKILL_OP_CHANGE_ALL) { 1167 if (ev.type == RFKILL_TYPE_ALL) { 1168 enum rfkill_type i; 1169 for (i = 0; i < NUM_RFKILL_TYPES; i++) 1170 rfkill_global_states[i].cur = ev.soft; 1171 } else { 1172 rfkill_global_states[ev.type].cur = ev.soft; 1173 } 1174 } 1175 1176 list_for_each_entry(rfkill, &rfkill_list, node) { 1177 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) 1178 continue; 1179 1180 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) 1181 continue; 1182 1183 rfkill_set_block(rfkill, ev.soft); 1184 } 1185 mutex_unlock(&rfkill_global_mutex); 1186 1187 return count; 1188 } 1189 1190 static int rfkill_fop_release(struct inode *inode, struct file *file) 1191 { 1192 struct rfkill_data *data = file->private_data; 1193 struct rfkill_int_event *ev, *tmp; 1194 1195 mutex_lock(&rfkill_global_mutex); 1196 list_del(&data->list); 1197 mutex_unlock(&rfkill_global_mutex); 1198 1199 mutex_destroy(&data->mtx); 1200 list_for_each_entry_safe(ev, tmp, &data->events, list) 1201 kfree(ev); 1202 1203 #ifdef CONFIG_RFKILL_INPUT 1204 if (data->input_handler) 1205 if (atomic_dec_return(&rfkill_input_disabled) == 0) 1206 printk(KERN_DEBUG "rfkill: input handler enabled\n"); 1207 #endif 1208 1209 kfree(data); 1210 1211 return 0; 1212 } 1213 1214 #ifdef CONFIG_RFKILL_INPUT 1215 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, 1216 unsigned long arg) 1217 { 1218 struct rfkill_data *data = file->private_data; 1219 1220 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) 1221 return -ENOSYS; 1222 1223 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) 1224 return -ENOSYS; 1225 1226 mutex_lock(&data->mtx); 1227 1228 if (!data->input_handler) { 1229 if (atomic_inc_return(&rfkill_input_disabled) == 1) 1230 printk(KERN_DEBUG "rfkill: input handler disabled\n"); 1231 data->input_handler = true; 1232 } 1233 1234 mutex_unlock(&data->mtx); 1235 1236 return 0; 1237 } 1238 #endif 1239 1240 static const struct file_operations rfkill_fops = { 1241 .owner = THIS_MODULE, 1242 .open = rfkill_fop_open, 1243 .read = rfkill_fop_read, 1244 .write = rfkill_fop_write, 1245 .poll = rfkill_fop_poll, 1246 .release = rfkill_fop_release, 1247 #ifdef CONFIG_RFKILL_INPUT 1248 .unlocked_ioctl = rfkill_fop_ioctl, 1249 .compat_ioctl = rfkill_fop_ioctl, 1250 #endif 1251 .llseek = no_llseek, 1252 }; 1253 1254 static struct miscdevice rfkill_miscdev = { 1255 .name = "rfkill", 1256 .fops = &rfkill_fops, 1257 .minor = MISC_DYNAMIC_MINOR, 1258 }; 1259 1260 static int __init rfkill_init(void) 1261 { 1262 int error; 1263 int i; 1264 1265 for (i = 0; i < NUM_RFKILL_TYPES; i++) 1266 rfkill_global_states[i].cur = !rfkill_default_state; 1267 1268 error = class_register(&rfkill_class); 1269 if (error) 1270 goto out; 1271 1272 error = misc_register(&rfkill_miscdev); 1273 if (error) { 1274 class_unregister(&rfkill_class); 1275 goto out; 1276 } 1277 1278 #ifdef CONFIG_RFKILL_INPUT 1279 error = rfkill_handler_init(); 1280 if (error) { 1281 misc_deregister(&rfkill_miscdev); 1282 class_unregister(&rfkill_class); 1283 goto out; 1284 } 1285 #endif 1286 1287 out: 1288 return error; 1289 } 1290 subsys_initcall(rfkill_init); 1291 1292 static void __exit rfkill_exit(void) 1293 { 1294 #ifdef CONFIG_RFKILL_INPUT 1295 rfkill_handler_exit(); 1296 #endif 1297 misc_deregister(&rfkill_miscdev); 1298 class_unregister(&rfkill_class); 1299 } 1300 module_exit(rfkill_exit); 1301