1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $) 4 * 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 * 8 * This driver fully implements the ACPI thermal policy as described in the 9 * ACPI 2.0 Specification. 10 * 11 * TBD: 1. Implement passive cooling hysteresis. 12 * 2. Enhance passive cooling (CPU) states/limit interface to support 13 * concepts of 'multiple limiters', upper/lower limits, etc. 14 */ 15 16#include <linux/kernel.h> 17#include <linux/module.h> 18#include <linux/dmi.h> 19#include <linux/init.h> 20#include <linux/slab.h> 21#include <linux/types.h> 22#include <linux/jiffies.h> 23#include <linux/kmod.h> 24#include <linux/reboot.h> 25#include <linux/device.h> 26#include <linux/thermal.h> 27#include <linux/acpi.h> 28#include <linux/workqueue.h> 29#include <linux/uaccess.h> 30#include <linux/units.h> 31 32#define PREFIX "ACPI: " 33 34#define ACPI_THERMAL_CLASS "thermal_zone" 35#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 36#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 37#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 38#define ACPI_THERMAL_NOTIFY_DEVICES 0x82 39#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 40#define ACPI_THERMAL_NOTIFY_HOT 0xF1 41#define ACPI_THERMAL_MODE_ACTIVE 0x00 42 43#define ACPI_THERMAL_MAX_ACTIVE 10 44#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 45 46#define _COMPONENT ACPI_THERMAL_COMPONENT 47ACPI_MODULE_NAME("thermal"); 48 49MODULE_AUTHOR("Paul Diefenbaugh"); 50MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 51MODULE_LICENSE("GPL"); 52 53static int act; 54module_param(act, int, 0644); 55MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 56 57static int crt; 58module_param(crt, int, 0644); 59MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 60 61static int tzp; 62module_param(tzp, int, 0444); 63MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 64 65static int nocrt; 66module_param(nocrt, int, 0); 67MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 68 69static int off; 70module_param(off, int, 0); 71MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 72 73static int psv; 74module_param(psv, int, 0644); 75MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 76 77static struct workqueue_struct *acpi_thermal_pm_queue; 78 79static int acpi_thermal_add(struct acpi_device *device); 80static int acpi_thermal_remove(struct acpi_device *device); 81static void acpi_thermal_notify(struct acpi_device *device, u32 event); 82 83static const struct acpi_device_id thermal_device_ids[] = { 84 {ACPI_THERMAL_HID, 0}, 85 {"", 0}, 86}; 87MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 88 89#ifdef CONFIG_PM_SLEEP 90static int acpi_thermal_suspend(struct device *dev); 91static int acpi_thermal_resume(struct device *dev); 92#else 93#define acpi_thermal_suspend NULL 94#define acpi_thermal_resume NULL 95#endif 96static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume); 97 98static struct acpi_driver acpi_thermal_driver = { 99 .name = "thermal", 100 .class = ACPI_THERMAL_CLASS, 101 .ids = thermal_device_ids, 102 .ops = { 103 .add = acpi_thermal_add, 104 .remove = acpi_thermal_remove, 105 .notify = acpi_thermal_notify, 106 }, 107 .drv.pm = &acpi_thermal_pm, 108}; 109 110struct acpi_thermal_state { 111 u8 critical:1; 112 u8 hot:1; 113 u8 passive:1; 114 u8 active:1; 115 u8 reserved:4; 116 int active_index; 117}; 118 119struct acpi_thermal_state_flags { 120 u8 valid:1; 121 u8 enabled:1; 122 u8 reserved:6; 123}; 124 125struct acpi_thermal_critical { 126 struct acpi_thermal_state_flags flags; 127 unsigned long temperature; 128}; 129 130struct acpi_thermal_hot { 131 struct acpi_thermal_state_flags flags; 132 unsigned long temperature; 133}; 134 135struct acpi_thermal_passive { 136 struct acpi_thermal_state_flags flags; 137 unsigned long temperature; 138 unsigned long tc1; 139 unsigned long tc2; 140 unsigned long tsp; 141 struct acpi_handle_list devices; 142}; 143 144struct acpi_thermal_active { 145 struct acpi_thermal_state_flags flags; 146 unsigned long temperature; 147 struct acpi_handle_list devices; 148}; 149 150struct acpi_thermal_trips { 151 struct acpi_thermal_critical critical; 152 struct acpi_thermal_hot hot; 153 struct acpi_thermal_passive passive; 154 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 155}; 156 157struct acpi_thermal_flags { 158 u8 cooling_mode:1; /* _SCP */ 159 u8 devices:1; /* _TZD */ 160 u8 reserved:6; 161}; 162 163struct acpi_thermal { 164 struct acpi_device * device; 165 acpi_bus_id name; 166 unsigned long temperature; 167 unsigned long last_temperature; 168 unsigned long polling_frequency; 169 volatile u8 zombie; 170 struct acpi_thermal_flags flags; 171 struct acpi_thermal_state state; 172 struct acpi_thermal_trips trips; 173 struct acpi_handle_list devices; 174 struct thermal_zone_device *thermal_zone; 175 int kelvin_offset; /* in millidegrees */ 176 struct work_struct thermal_check_work; 177 struct mutex thermal_check_lock; 178 refcount_t thermal_check_count; 179}; 180 181/* -------------------------------------------------------------------------- 182 Thermal Zone Management 183 -------------------------------------------------------------------------- */ 184 185static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 186{ 187 acpi_status status = AE_OK; 188 unsigned long long tmp; 189 190 if (!tz) 191 return -EINVAL; 192 193 tz->last_temperature = tz->temperature; 194 195 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 196 if (ACPI_FAILURE(status)) 197 return -ENODEV; 198 199 tz->temperature = tmp; 200 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 201 tz->temperature)); 202 203 return 0; 204} 205 206static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 207{ 208 acpi_status status = AE_OK; 209 unsigned long long tmp; 210 211 if (!tz) 212 return -EINVAL; 213 214 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 215 if (ACPI_FAILURE(status)) 216 return -ENODEV; 217 218 tz->polling_frequency = tmp; 219 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 220 tz->polling_frequency)); 221 222 return 0; 223} 224 225static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 226{ 227 if (!tz) 228 return -EINVAL; 229 230 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle, 231 "_SCP", mode))) 232 return -ENODEV; 233 234 return 0; 235} 236 237#define ACPI_TRIPS_CRITICAL 0x01 238#define ACPI_TRIPS_HOT 0x02 239#define ACPI_TRIPS_PASSIVE 0x04 240#define ACPI_TRIPS_ACTIVE 0x08 241#define ACPI_TRIPS_DEVICES 0x10 242 243#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 244#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 245 246#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 247 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 248 ACPI_TRIPS_DEVICES) 249 250/* 251 * This exception is thrown out in two cases: 252 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 253 * when re-evaluating the AML code. 254 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 255 * We need to re-bind the cooling devices of a thermal zone when this occurs. 256 */ 257#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 258do { \ 259 if (flags != ACPI_TRIPS_INIT) \ 260 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 261 "ACPI thermal trip point %s changed\n" \ 262 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \ 263} while (0) 264 265static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 266{ 267 acpi_status status = AE_OK; 268 unsigned long long tmp; 269 struct acpi_handle_list devices; 270 int valid = 0; 271 int i; 272 273 /* Critical Shutdown */ 274 if (flag & ACPI_TRIPS_CRITICAL) { 275 status = acpi_evaluate_integer(tz->device->handle, 276 "_CRT", NULL, &tmp); 277 tz->trips.critical.temperature = tmp; 278 /* 279 * Treat freezing temperatures as invalid as well; some 280 * BIOSes return really low values and cause reboots at startup. 281 * Below zero (Celsius) values clearly aren't right for sure.. 282 * ... so lets discard those as invalid. 283 */ 284 if (ACPI_FAILURE(status)) { 285 tz->trips.critical.flags.valid = 0; 286 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 287 "No critical threshold\n")); 288 } else if (tmp <= 2732) { 289 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n", 290 tmp); 291 tz->trips.critical.flags.valid = 0; 292 } else { 293 tz->trips.critical.flags.valid = 1; 294 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 295 "Found critical threshold [%lu]\n", 296 tz->trips.critical.temperature)); 297 } 298 if (tz->trips.critical.flags.valid == 1) { 299 if (crt == -1) { 300 tz->trips.critical.flags.valid = 0; 301 } else if (crt > 0) { 302 unsigned long crt_k = celsius_to_deci_kelvin(crt); 303 304 /* 305 * Allow override critical threshold 306 */ 307 if (crt_k > tz->trips.critical.temperature) 308 pr_warn(PREFIX "Critical threshold %d C\n", 309 crt); 310 tz->trips.critical.temperature = crt_k; 311 } 312 } 313 } 314 315 /* Critical Sleep (optional) */ 316 if (flag & ACPI_TRIPS_HOT) { 317 status = acpi_evaluate_integer(tz->device->handle, 318 "_HOT", NULL, &tmp); 319 if (ACPI_FAILURE(status)) { 320 tz->trips.hot.flags.valid = 0; 321 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 322 "No hot threshold\n")); 323 } else { 324 tz->trips.hot.temperature = tmp; 325 tz->trips.hot.flags.valid = 1; 326 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 327 "Found hot threshold [%lu]\n", 328 tz->trips.hot.temperature)); 329 } 330 } 331 332 /* Passive (optional) */ 333 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 334 (flag == ACPI_TRIPS_INIT)) { 335 valid = tz->trips.passive.flags.valid; 336 if (psv == -1) { 337 status = AE_SUPPORT; 338 } else if (psv > 0) { 339 tmp = celsius_to_deci_kelvin(psv); 340 status = AE_OK; 341 } else { 342 status = acpi_evaluate_integer(tz->device->handle, 343 "_PSV", NULL, &tmp); 344 } 345 346 if (ACPI_FAILURE(status)) 347 tz->trips.passive.flags.valid = 0; 348 else { 349 tz->trips.passive.temperature = tmp; 350 tz->trips.passive.flags.valid = 1; 351 if (flag == ACPI_TRIPS_INIT) { 352 status = acpi_evaluate_integer( 353 tz->device->handle, "_TC1", 354 NULL, &tmp); 355 if (ACPI_FAILURE(status)) 356 tz->trips.passive.flags.valid = 0; 357 else 358 tz->trips.passive.tc1 = tmp; 359 status = acpi_evaluate_integer( 360 tz->device->handle, "_TC2", 361 NULL, &tmp); 362 if (ACPI_FAILURE(status)) 363 tz->trips.passive.flags.valid = 0; 364 else 365 tz->trips.passive.tc2 = tmp; 366 status = acpi_evaluate_integer( 367 tz->device->handle, "_TSP", 368 NULL, &tmp); 369 if (ACPI_FAILURE(status)) 370 tz->trips.passive.flags.valid = 0; 371 else 372 tz->trips.passive.tsp = tmp; 373 } 374 } 375 } 376 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 377 memset(&devices, 0, sizeof(struct acpi_handle_list)); 378 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 379 NULL, &devices); 380 if (ACPI_FAILURE(status)) { 381 pr_warn(PREFIX "Invalid passive threshold\n"); 382 tz->trips.passive.flags.valid = 0; 383 } 384 else 385 tz->trips.passive.flags.valid = 1; 386 387 if (memcmp(&tz->trips.passive.devices, &devices, 388 sizeof(struct acpi_handle_list))) { 389 memcpy(&tz->trips.passive.devices, &devices, 390 sizeof(struct acpi_handle_list)); 391 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 392 } 393 } 394 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 395 if (valid != tz->trips.passive.flags.valid) 396 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 397 } 398 399 /* Active (optional) */ 400 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 401 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 402 valid = tz->trips.active[i].flags.valid; 403 404 if (act == -1) 405 break; /* disable all active trip points */ 406 407 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 408 tz->trips.active[i].flags.valid)) { 409 status = acpi_evaluate_integer(tz->device->handle, 410 name, NULL, &tmp); 411 if (ACPI_FAILURE(status)) { 412 tz->trips.active[i].flags.valid = 0; 413 if (i == 0) 414 break; 415 if (act <= 0) 416 break; 417 if (i == 1) 418 tz->trips.active[0].temperature = 419 celsius_to_deci_kelvin(act); 420 else 421 /* 422 * Don't allow override higher than 423 * the next higher trip point 424 */ 425 tz->trips.active[i - 1].temperature = 426 (tz->trips.active[i - 2].temperature < 427 celsius_to_deci_kelvin(act) ? 428 tz->trips.active[i - 2].temperature : 429 celsius_to_deci_kelvin(act)); 430 break; 431 } else { 432 tz->trips.active[i].temperature = tmp; 433 tz->trips.active[i].flags.valid = 1; 434 } 435 } 436 437 name[2] = 'L'; 438 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 439 memset(&devices, 0, sizeof(struct acpi_handle_list)); 440 status = acpi_evaluate_reference(tz->device->handle, 441 name, NULL, &devices); 442 if (ACPI_FAILURE(status)) { 443 pr_warn(PREFIX "Invalid active%d threshold\n", 444 i); 445 tz->trips.active[i].flags.valid = 0; 446 } 447 else 448 tz->trips.active[i].flags.valid = 1; 449 450 if (memcmp(&tz->trips.active[i].devices, &devices, 451 sizeof(struct acpi_handle_list))) { 452 memcpy(&tz->trips.active[i].devices, &devices, 453 sizeof(struct acpi_handle_list)); 454 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 455 } 456 } 457 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 458 if (valid != tz->trips.active[i].flags.valid) 459 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 460 461 if (!tz->trips.active[i].flags.valid) 462 break; 463 } 464 465 if (flag & ACPI_TRIPS_DEVICES) { 466 memset(&devices, 0, sizeof(devices)); 467 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 468 NULL, &devices); 469 if (ACPI_SUCCESS(status) 470 && memcmp(&tz->devices, &devices, sizeof(devices))) { 471 tz->devices = devices; 472 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 473 } 474 } 475 476 return 0; 477} 478 479static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 480{ 481 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 482 483 if (ret) 484 return ret; 485 486 valid = tz->trips.critical.flags.valid | 487 tz->trips.hot.flags.valid | 488 tz->trips.passive.flags.valid; 489 490 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 491 valid |= tz->trips.active[i].flags.valid; 492 493 if (!valid) { 494 pr_warn(FW_BUG "No valid trip found\n"); 495 return -ENODEV; 496 } 497 return 0; 498} 499 500/* sys I/F for generic thermal sysfs support */ 501 502static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) 503{ 504 struct acpi_thermal *tz = thermal->devdata; 505 int result; 506 507 if (!tz) 508 return -EINVAL; 509 510 result = acpi_thermal_get_temperature(tz); 511 if (result) 512 return result; 513 514 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature, 515 tz->kelvin_offset); 516 return 0; 517} 518 519static int thermal_get_trip_type(struct thermal_zone_device *thermal, 520 int trip, enum thermal_trip_type *type) 521{ 522 struct acpi_thermal *tz = thermal->devdata; 523 int i; 524 525 if (!tz || trip < 0) 526 return -EINVAL; 527 528 if (tz->trips.critical.flags.valid) { 529 if (!trip) { 530 *type = THERMAL_TRIP_CRITICAL; 531 return 0; 532 } 533 trip--; 534 } 535 536 if (tz->trips.hot.flags.valid) { 537 if (!trip) { 538 *type = THERMAL_TRIP_HOT; 539 return 0; 540 } 541 trip--; 542 } 543 544 if (tz->trips.passive.flags.valid) { 545 if (!trip) { 546 *type = THERMAL_TRIP_PASSIVE; 547 return 0; 548 } 549 trip--; 550 } 551 552 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 553 tz->trips.active[i].flags.valid; i++) { 554 if (!trip) { 555 *type = THERMAL_TRIP_ACTIVE; 556 return 0; 557 } 558 trip--; 559 } 560 561 return -EINVAL; 562} 563 564static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 565 int trip, int *temp) 566{ 567 struct acpi_thermal *tz = thermal->devdata; 568 int i; 569 570 if (!tz || trip < 0) 571 return -EINVAL; 572 573 if (tz->trips.critical.flags.valid) { 574 if (!trip) { 575 *temp = deci_kelvin_to_millicelsius_with_offset( 576 tz->trips.critical.temperature, 577 tz->kelvin_offset); 578 return 0; 579 } 580 trip--; 581 } 582 583 if (tz->trips.hot.flags.valid) { 584 if (!trip) { 585 *temp = deci_kelvin_to_millicelsius_with_offset( 586 tz->trips.hot.temperature, 587 tz->kelvin_offset); 588 return 0; 589 } 590 trip--; 591 } 592 593 if (tz->trips.passive.flags.valid) { 594 if (!trip) { 595 *temp = deci_kelvin_to_millicelsius_with_offset( 596 tz->trips.passive.temperature, 597 tz->kelvin_offset); 598 return 0; 599 } 600 trip--; 601 } 602 603 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 604 tz->trips.active[i].flags.valid; i++) { 605 if (!trip) { 606 *temp = deci_kelvin_to_millicelsius_with_offset( 607 tz->trips.active[i].temperature, 608 tz->kelvin_offset); 609 return 0; 610 } 611 trip--; 612 } 613 614 return -EINVAL; 615} 616 617static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 618 int *temperature) 619{ 620 struct acpi_thermal *tz = thermal->devdata; 621 622 if (tz->trips.critical.flags.valid) { 623 *temperature = deci_kelvin_to_millicelsius_with_offset( 624 tz->trips.critical.temperature, 625 tz->kelvin_offset); 626 return 0; 627 } else 628 return -EINVAL; 629} 630 631static int thermal_get_trend(struct thermal_zone_device *thermal, 632 int trip, enum thermal_trend *trend) 633{ 634 struct acpi_thermal *tz = thermal->devdata; 635 enum thermal_trip_type type; 636 int i; 637 638 if (thermal_get_trip_type(thermal, trip, &type)) 639 return -EINVAL; 640 641 if (type == THERMAL_TRIP_ACTIVE) { 642 int trip_temp; 643 int temp = deci_kelvin_to_millicelsius_with_offset( 644 tz->temperature, tz->kelvin_offset); 645 if (thermal_get_trip_temp(thermal, trip, &trip_temp)) 646 return -EINVAL; 647 648 if (temp > trip_temp) { 649 *trend = THERMAL_TREND_RAISING; 650 return 0; 651 } else { 652 /* Fall back on default trend */ 653 return -EINVAL; 654 } 655 } 656 657 /* 658 * tz->temperature has already been updated by generic thermal layer, 659 * before this callback being invoked 660 */ 661 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature)) 662 + (tz->trips.passive.tc2 663 * (tz->temperature - tz->trips.passive.temperature)); 664 665 if (i > 0) 666 *trend = THERMAL_TREND_RAISING; 667 else if (i < 0) 668 *trend = THERMAL_TREND_DROPPING; 669 else 670 *trend = THERMAL_TREND_STABLE; 671 return 0; 672} 673 674 675static int thermal_notify(struct thermal_zone_device *thermal, int trip, 676 enum thermal_trip_type trip_type) 677{ 678 u8 type = 0; 679 struct acpi_thermal *tz = thermal->devdata; 680 681 if (trip_type == THERMAL_TRIP_CRITICAL) 682 type = ACPI_THERMAL_NOTIFY_CRITICAL; 683 else if (trip_type == THERMAL_TRIP_HOT) 684 type = ACPI_THERMAL_NOTIFY_HOT; 685 else 686 return 0; 687 688 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 689 dev_name(&tz->device->dev), type, 1); 690 691 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 692 return 1; 693 694 return 0; 695} 696 697static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 698 struct thermal_cooling_device *cdev, 699 bool bind) 700{ 701 struct acpi_device *device = cdev->devdata; 702 struct acpi_thermal *tz = thermal->devdata; 703 struct acpi_device *dev; 704 acpi_status status; 705 acpi_handle handle; 706 int i; 707 int j; 708 int trip = -1; 709 int result = 0; 710 711 if (tz->trips.critical.flags.valid) 712 trip++; 713 714 if (tz->trips.hot.flags.valid) 715 trip++; 716 717 if (tz->trips.passive.flags.valid) { 718 trip++; 719 for (i = 0; i < tz->trips.passive.devices.count; 720 i++) { 721 handle = tz->trips.passive.devices.handles[i]; 722 status = acpi_bus_get_device(handle, &dev); 723 if (ACPI_FAILURE(status) || dev != device) 724 continue; 725 if (bind) 726 result = 727 thermal_zone_bind_cooling_device 728 (thermal, trip, cdev, 729 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 730 THERMAL_WEIGHT_DEFAULT); 731 else 732 result = 733 thermal_zone_unbind_cooling_device 734 (thermal, trip, cdev); 735 if (result) 736 goto failed; 737 } 738 } 739 740 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 741 if (!tz->trips.active[i].flags.valid) 742 break; 743 trip++; 744 for (j = 0; 745 j < tz->trips.active[i].devices.count; 746 j++) { 747 handle = tz->trips.active[i].devices.handles[j]; 748 status = acpi_bus_get_device(handle, &dev); 749 if (ACPI_FAILURE(status) || dev != device) 750 continue; 751 if (bind) 752 result = thermal_zone_bind_cooling_device 753 (thermal, trip, cdev, 754 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 755 THERMAL_WEIGHT_DEFAULT); 756 else 757 result = thermal_zone_unbind_cooling_device 758 (thermal, trip, cdev); 759 if (result) 760 goto failed; 761 } 762 } 763 764 for (i = 0; i < tz->devices.count; i++) { 765 handle = tz->devices.handles[i]; 766 status = acpi_bus_get_device(handle, &dev); 767 if (ACPI_SUCCESS(status) && (dev == device)) { 768 if (bind) 769 result = thermal_zone_bind_cooling_device 770 (thermal, THERMAL_TRIPS_NONE, 771 cdev, THERMAL_NO_LIMIT, 772 THERMAL_NO_LIMIT, 773 THERMAL_WEIGHT_DEFAULT); 774 else 775 result = thermal_zone_unbind_cooling_device 776 (thermal, THERMAL_TRIPS_NONE, 777 cdev); 778 if (result) 779 goto failed; 780 } 781 } 782 783failed: 784 return result; 785} 786 787static int 788acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 789 struct thermal_cooling_device *cdev) 790{ 791 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 792} 793 794static int 795acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 796 struct thermal_cooling_device *cdev) 797{ 798 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 799} 800 801static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 802 .bind = acpi_thermal_bind_cooling_device, 803 .unbind = acpi_thermal_unbind_cooling_device, 804 .get_temp = thermal_get_temp, 805 .get_trip_type = thermal_get_trip_type, 806 .get_trip_temp = thermal_get_trip_temp, 807 .get_crit_temp = thermal_get_crit_temp, 808 .get_trend = thermal_get_trend, 809 .notify = thermal_notify, 810}; 811 812static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 813{ 814 int trips = 0; 815 int result; 816 acpi_status status; 817 int i; 818 819 if (tz->trips.critical.flags.valid) 820 trips++; 821 822 if (tz->trips.hot.flags.valid) 823 trips++; 824 825 if (tz->trips.passive.flags.valid) 826 trips++; 827 828 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 829 tz->trips.active[i].flags.valid; i++, trips++); 830 831 if (tz->trips.passive.flags.valid) 832 tz->thermal_zone = 833 thermal_zone_device_register("acpitz", trips, 0, tz, 834 &acpi_thermal_zone_ops, NULL, 835 tz->trips.passive.tsp*100, 836 tz->polling_frequency*100); 837 else 838 tz->thermal_zone = 839 thermal_zone_device_register("acpitz", trips, 0, tz, 840 &acpi_thermal_zone_ops, NULL, 841 0, tz->polling_frequency*100); 842 if (IS_ERR(tz->thermal_zone)) 843 return -ENODEV; 844 845 result = sysfs_create_link(&tz->device->dev.kobj, 846 &tz->thermal_zone->device.kobj, "thermal_zone"); 847 if (result) 848 goto unregister_tzd; 849 850 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 851 &tz->device->dev.kobj, "device"); 852 if (result) 853 goto remove_tz_link; 854 855 status = acpi_bus_attach_private_data(tz->device->handle, 856 tz->thermal_zone); 857 if (ACPI_FAILURE(status)) { 858 result = -ENODEV; 859 goto remove_dev_link; 860 } 861 862 result = thermal_zone_device_enable(tz->thermal_zone); 863 if (result) 864 goto acpi_bus_detach; 865 866 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 867 tz->thermal_zone->id); 868 869 return 0; 870 871acpi_bus_detach: 872 acpi_bus_detach_private_data(tz->device->handle); 873remove_dev_link: 874 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 875remove_tz_link: 876 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 877unregister_tzd: 878 thermal_zone_device_unregister(tz->thermal_zone); 879 880 return result; 881} 882 883static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 884{ 885 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 886 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 887 thermal_zone_device_unregister(tz->thermal_zone); 888 tz->thermal_zone = NULL; 889 acpi_bus_detach_private_data(tz->device->handle); 890} 891 892 893/* -------------------------------------------------------------------------- 894 Driver Interface 895 -------------------------------------------------------------------------- */ 896 897static void acpi_queue_thermal_check(struct acpi_thermal *tz) 898{ 899 if (!work_pending(&tz->thermal_check_work)) 900 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); 901} 902 903static void acpi_thermal_notify(struct acpi_device *device, u32 event) 904{ 905 struct acpi_thermal *tz = acpi_driver_data(device); 906 907 908 if (!tz) 909 return; 910 911 switch (event) { 912 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 913 acpi_queue_thermal_check(tz); 914 break; 915 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 917 acpi_queue_thermal_check(tz); 918 acpi_bus_generate_netlink_event(device->pnp.device_class, 919 dev_name(&device->dev), event, 0); 920 break; 921 case ACPI_THERMAL_NOTIFY_DEVICES: 922 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 923 acpi_queue_thermal_check(tz); 924 acpi_bus_generate_netlink_event(device->pnp.device_class, 925 dev_name(&device->dev), event, 0); 926 break; 927 default: 928 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 929 "Unsupported event [0x%x]\n", event)); 930 break; 931 } 932} 933 934/* 935 * On some platforms, the AML code has dependency about 936 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 937 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 938 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 939 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 940 * if _TMP has never been evaluated. 941 * 942 * As this dependency is totally transparent to OS, evaluate 943 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 944 * _TMP, before they are actually used. 945 */ 946static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 947{ 948 acpi_handle handle = tz->device->handle; 949 unsigned long long value; 950 int i; 951 952 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 953 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 954 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 955 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 956 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 957 acpi_status status; 958 959 status = acpi_evaluate_integer(handle, name, NULL, &value); 960 if (status == AE_NOT_FOUND) 961 break; 962 } 963 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 964} 965 966static int acpi_thermal_get_info(struct acpi_thermal *tz) 967{ 968 int result = 0; 969 970 971 if (!tz) 972 return -EINVAL; 973 974 acpi_thermal_aml_dependency_fix(tz); 975 976 /* Get trip points [_CRT, _PSV, etc.] (required) */ 977 result = acpi_thermal_get_trip_points(tz); 978 if (result) 979 return result; 980 981 /* Get temperature [_TMP] (required) */ 982 result = acpi_thermal_get_temperature(tz); 983 if (result) 984 return result; 985 986 /* Set the cooling mode [_SCP] to active cooling (default) */ 987 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 988 if (!result) 989 tz->flags.cooling_mode = 1; 990 991 /* Get default polling frequency [_TZP] (optional) */ 992 if (tzp) 993 tz->polling_frequency = tzp; 994 else 995 acpi_thermal_get_polling_frequency(tz); 996 997 return 0; 998} 999 1000/* 1001 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1002 * handles temperature values with a single decimal place. As a consequence, 1003 * some implementations use an offset of 273.1 and others use an offset of 1004 * 273.2. Try to find out which one is being used, to present the most 1005 * accurate and visually appealing number. 1006 * 1007 * The heuristic below should work for all ACPI thermal zones which have a 1008 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1009 */ 1010static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1011{ 1012 if (tz->trips.critical.flags.valid && 1013 (tz->trips.critical.temperature % 5) == 1) 1014 tz->kelvin_offset = 273100; 1015 else 1016 tz->kelvin_offset = 273200; 1017} 1018 1019static void acpi_thermal_check_fn(struct work_struct *work) 1020{ 1021 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 1022 thermal_check_work); 1023 1024 /* 1025 * In general, it is not sufficient to check the pending bit, because 1026 * subsequent instances of this function may be queued after one of them 1027 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just 1028 * one of them is running, though, because it may have done the actual 1029 * check some time ago, so allow at least one of them to block on the 1030 * mutex while another one is running the update. 1031 */ 1032 if (!refcount_dec_not_one(&tz->thermal_check_count)) 1033 return; 1034 1035 mutex_lock(&tz->thermal_check_lock); 1036 1037 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED); 1038 1039 refcount_inc(&tz->thermal_check_count); 1040 1041 mutex_unlock(&tz->thermal_check_lock); 1042} 1043 1044static int acpi_thermal_add(struct acpi_device *device) 1045{ 1046 int result = 0; 1047 struct acpi_thermal *tz = NULL; 1048 1049 1050 if (!device) 1051 return -EINVAL; 1052 1053 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1054 if (!tz) 1055 return -ENOMEM; 1056 1057 tz->device = device; 1058 strcpy(tz->name, device->pnp.bus_id); 1059 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1060 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1061 device->driver_data = tz; 1062 1063 result = acpi_thermal_get_info(tz); 1064 if (result) 1065 goto free_memory; 1066 1067 acpi_thermal_guess_offset(tz); 1068 1069 result = acpi_thermal_register_thermal_zone(tz); 1070 if (result) 1071 goto free_memory; 1072 1073 refcount_set(&tz->thermal_check_count, 3); 1074 mutex_init(&tz->thermal_check_lock); 1075 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1076 1077 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device), 1078 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature)); 1079 goto end; 1080 1081free_memory: 1082 kfree(tz); 1083end: 1084 return result; 1085} 1086 1087static int acpi_thermal_remove(struct acpi_device *device) 1088{ 1089 struct acpi_thermal *tz = NULL; 1090 1091 if (!device || !acpi_driver_data(device)) 1092 return -EINVAL; 1093 1094 flush_workqueue(acpi_thermal_pm_queue); 1095 tz = acpi_driver_data(device); 1096 1097 acpi_thermal_unregister_thermal_zone(tz); 1098 kfree(tz); 1099 return 0; 1100} 1101 1102#ifdef CONFIG_PM_SLEEP 1103static int acpi_thermal_suspend(struct device *dev) 1104{ 1105 /* Make sure the previously queued thermal check work has been done */ 1106 flush_workqueue(acpi_thermal_pm_queue); 1107 return 0; 1108} 1109 1110static int acpi_thermal_resume(struct device *dev) 1111{ 1112 struct acpi_thermal *tz; 1113 int i, j, power_state, result; 1114 1115 if (!dev) 1116 return -EINVAL; 1117 1118 tz = acpi_driver_data(to_acpi_device(dev)); 1119 if (!tz) 1120 return -EINVAL; 1121 1122 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1123 if (!tz->trips.active[i].flags.valid) 1124 break; 1125 tz->trips.active[i].flags.enabled = 1; 1126 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1127 result = acpi_bus_update_power( 1128 tz->trips.active[i].devices.handles[j], 1129 &power_state); 1130 if (result || (power_state != ACPI_STATE_D0)) { 1131 tz->trips.active[i].flags.enabled = 0; 1132 break; 1133 } 1134 } 1135 tz->state.active |= tz->trips.active[i].flags.enabled; 1136 } 1137 1138 acpi_queue_thermal_check(tz); 1139 1140 return AE_OK; 1141} 1142#endif 1143 1144static int thermal_act(const struct dmi_system_id *d) { 1145 1146 if (act == 0) { 1147 pr_notice(PREFIX "%s detected: " 1148 "disabling all active thermal trip points\n", d->ident); 1149 act = -1; 1150 } 1151 return 0; 1152} 1153static int thermal_nocrt(const struct dmi_system_id *d) { 1154 1155 pr_notice(PREFIX "%s detected: " 1156 "disabling all critical thermal trip point actions.\n", d->ident); 1157 nocrt = 1; 1158 return 0; 1159} 1160static int thermal_tzp(const struct dmi_system_id *d) { 1161 1162 if (tzp == 0) { 1163 pr_notice(PREFIX "%s detected: " 1164 "enabling thermal zone polling\n", d->ident); 1165 tzp = 300; /* 300 dS = 30 Seconds */ 1166 } 1167 return 0; 1168} 1169static int thermal_psv(const struct dmi_system_id *d) { 1170 1171 if (psv == 0) { 1172 pr_notice(PREFIX "%s detected: " 1173 "disabling all passive thermal trip points\n", d->ident); 1174 psv = -1; 1175 } 1176 return 0; 1177} 1178 1179static const struct dmi_system_id thermal_dmi_table[] __initconst = { 1180 /* 1181 * Award BIOS on this AOpen makes thermal control almost worthless. 1182 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1183 */ 1184 { 1185 .callback = thermal_act, 1186 .ident = "AOpen i915GMm-HFS", 1187 .matches = { 1188 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1189 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1190 }, 1191 }, 1192 { 1193 .callback = thermal_psv, 1194 .ident = "AOpen i915GMm-HFS", 1195 .matches = { 1196 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1197 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1198 }, 1199 }, 1200 { 1201 .callback = thermal_tzp, 1202 .ident = "AOpen i915GMm-HFS", 1203 .matches = { 1204 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1205 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1206 }, 1207 }, 1208 { 1209 .callback = thermal_nocrt, 1210 .ident = "Gigabyte GA-7ZX", 1211 .matches = { 1212 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1213 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1214 }, 1215 }, 1216 {} 1217}; 1218 1219static int __init acpi_thermal_init(void) 1220{ 1221 int result = 0; 1222 1223 dmi_check_system(thermal_dmi_table); 1224 1225 if (off) { 1226 pr_notice(PREFIX "thermal control disabled\n"); 1227 return -ENODEV; 1228 } 1229 1230 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", 1231 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); 1232 if (!acpi_thermal_pm_queue) 1233 return -ENODEV; 1234 1235 result = acpi_bus_register_driver(&acpi_thermal_driver); 1236 if (result < 0) { 1237 destroy_workqueue(acpi_thermal_pm_queue); 1238 return -ENODEV; 1239 } 1240 1241 return 0; 1242} 1243 1244static void __exit acpi_thermal_exit(void) 1245{ 1246 acpi_bus_unregister_driver(&acpi_thermal_driver); 1247 destroy_workqueue(acpi_thermal_pm_queue); 1248 1249 return; 1250} 1251 1252module_init(acpi_thermal_init); 1253module_exit(acpi_thermal_exit); 1254