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