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 = AE_OK; 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, 274 "_CRT", NULL, &tmp); 275 tz->trips.critical.temperature = tmp; 276 /* 277 * Treat freezing temperatures as invalid as well; some 278 * BIOSes return really low values and cause reboots at startup. 279 * Below zero (Celsius) values clearly aren't right for sure.. 280 * ... so lets discard those as invalid. 281 */ 282 if (ACPI_FAILURE(status)) { 283 tz->trips.critical.flags.valid = 0; 284 acpi_handle_debug(tz->device->handle, 285 "No critical threshold\n"); 286 } else if (tmp <= 2732) { 287 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", 288 tmp); 289 tz->trips.critical.flags.valid = 0; 290 } else { 291 tz->trips.critical.flags.valid = 1; 292 acpi_handle_debug(tz->device->handle, 293 "Found critical threshold [%lu]\n", 294 tz->trips.critical.temperature); 295 } 296 if (tz->trips.critical.flags.valid == 1) { 297 if (crt == -1) { 298 tz->trips.critical.flags.valid = 0; 299 } else if (crt > 0) { 300 unsigned long crt_k = celsius_to_deci_kelvin(crt); 301 302 /* 303 * Allow override critical threshold 304 */ 305 if (crt_k > tz->trips.critical.temperature) 306 pr_info("Critical threshold %d C\n", crt); 307 308 tz->trips.critical.temperature = crt_k; 309 } 310 } 311 } 312 313 /* Critical Sleep (optional) */ 314 if (flag & ACPI_TRIPS_HOT) { 315 status = acpi_evaluate_integer(tz->device->handle, 316 "_HOT", NULL, &tmp); 317 if (ACPI_FAILURE(status)) { 318 tz->trips.hot.flags.valid = 0; 319 acpi_handle_debug(tz->device->handle, 320 "No hot threshold\n"); 321 } else { 322 tz->trips.hot.temperature = tmp; 323 tz->trips.hot.flags.valid = 1; 324 acpi_handle_debug(tz->device->handle, 325 "Found hot threshold [%lu]\n", 326 tz->trips.hot.temperature); 327 } 328 } 329 330 /* Passive (optional) */ 331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 332 (flag == ACPI_TRIPS_INIT)) { 333 valid = tz->trips.passive.flags.valid; 334 if (psv == -1) { 335 status = AE_SUPPORT; 336 } else if (psv > 0) { 337 tmp = celsius_to_deci_kelvin(psv); 338 status = AE_OK; 339 } else { 340 status = acpi_evaluate_integer(tz->device->handle, 341 "_PSV", NULL, &tmp); 342 } 343 344 if (ACPI_FAILURE(status)) 345 tz->trips.passive.flags.valid = 0; 346 else { 347 tz->trips.passive.temperature = tmp; 348 tz->trips.passive.flags.valid = 1; 349 if (flag == ACPI_TRIPS_INIT) { 350 status = acpi_evaluate_integer( 351 tz->device->handle, "_TC1", 352 NULL, &tmp); 353 if (ACPI_FAILURE(status)) 354 tz->trips.passive.flags.valid = 0; 355 else 356 tz->trips.passive.tc1 = tmp; 357 status = acpi_evaluate_integer( 358 tz->device->handle, "_TC2", 359 NULL, &tmp); 360 if (ACPI_FAILURE(status)) 361 tz->trips.passive.flags.valid = 0; 362 else 363 tz->trips.passive.tc2 = tmp; 364 status = acpi_evaluate_integer( 365 tz->device->handle, "_TSP", 366 NULL, &tmp); 367 if (ACPI_FAILURE(status)) 368 tz->trips.passive.flags.valid = 0; 369 else 370 tz->trips.passive.tsp = tmp; 371 } 372 } 373 } 374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 375 memset(&devices, 0, sizeof(struct acpi_handle_list)); 376 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 377 NULL, &devices); 378 if (ACPI_FAILURE(status)) { 379 acpi_handle_info(tz->device->handle, 380 "Invalid passive threshold\n"); 381 tz->trips.passive.flags.valid = 0; 382 } 383 else 384 tz->trips.passive.flags.valid = 1; 385 386 if (memcmp(&tz->trips.passive.devices, &devices, 387 sizeof(struct acpi_handle_list))) { 388 memcpy(&tz->trips.passive.devices, &devices, 389 sizeof(struct acpi_handle_list)); 390 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); 391 } 392 } 393 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 394 if (valid != tz->trips.passive.flags.valid) 395 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state"); 396 } 397 398 /* Active (optional) */ 399 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 400 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 401 valid = tz->trips.active[i].flags.valid; 402 403 if (act == -1) 404 break; /* disable all active trip points */ 405 406 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 407 tz->trips.active[i].flags.valid)) { 408 status = acpi_evaluate_integer(tz->device->handle, 409 name, NULL, &tmp); 410 if (ACPI_FAILURE(status)) { 411 tz->trips.active[i].flags.valid = 0; 412 if (i == 0) 413 break; 414 if (act <= 0) 415 break; 416 if (i == 1) 417 tz->trips.active[0].temperature = 418 celsius_to_deci_kelvin(act); 419 else 420 /* 421 * Don't allow override higher than 422 * the next higher trip point 423 */ 424 tz->trips.active[i - 1].temperature = 425 (tz->trips.active[i - 2].temperature < 426 celsius_to_deci_kelvin(act) ? 427 tz->trips.active[i - 2].temperature : 428 celsius_to_deci_kelvin(act)); 429 break; 430 } else { 431 tz->trips.active[i].temperature = tmp; 432 tz->trips.active[i].flags.valid = 1; 433 } 434 } 435 436 name[2] = 'L'; 437 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 438 memset(&devices, 0, sizeof(struct acpi_handle_list)); 439 status = acpi_evaluate_reference(tz->device->handle, 440 name, NULL, &devices); 441 if (ACPI_FAILURE(status)) { 442 acpi_handle_info(tz->device->handle, 443 "Invalid active%d threshold\n", i); 444 tz->trips.active[i].flags.valid = 0; 445 } 446 else 447 tz->trips.active[i].flags.valid = 1; 448 449 if (memcmp(&tz->trips.active[i].devices, &devices, 450 sizeof(struct acpi_handle_list))) { 451 memcpy(&tz->trips.active[i].devices, &devices, 452 sizeof(struct acpi_handle_list)); 453 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); 454 } 455 } 456 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 457 if (valid != tz->trips.active[i].flags.valid) 458 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state"); 459 460 if (!tz->trips.active[i].flags.valid) 461 break; 462 } 463 464 if (flag & ACPI_TRIPS_DEVICES) { 465 memset(&devices, 0, sizeof(devices)); 466 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 467 NULL, &devices); 468 if (ACPI_SUCCESS(status) 469 && memcmp(&tz->devices, &devices, sizeof(devices))) { 470 tz->devices = devices; 471 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); 472 } 473 } 474 475 return 0; 476 } 477 478 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 479 { 480 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 481 482 if (ret) 483 return ret; 484 485 valid = tz->trips.critical.flags.valid | 486 tz->trips.hot.flags.valid | 487 tz->trips.passive.flags.valid; 488 489 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 490 valid |= tz->trips.active[i].flags.valid; 491 492 if (!valid) { 493 pr_warn(FW_BUG "No valid trip found\n"); 494 return -ENODEV; 495 } 496 return 0; 497 } 498 499 /* sys I/F for generic thermal sysfs support */ 500 501 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) 502 { 503 struct acpi_thermal *tz = thermal->devdata; 504 int result; 505 506 if (!tz) 507 return -EINVAL; 508 509 result = acpi_thermal_get_temperature(tz); 510 if (result) 511 return result; 512 513 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature, 514 tz->kelvin_offset); 515 return 0; 516 } 517 518 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 519 int trip, enum thermal_trip_type *type) 520 { 521 struct acpi_thermal *tz = thermal->devdata; 522 int i; 523 524 if (!tz || trip < 0) 525 return -EINVAL; 526 527 if (tz->trips.critical.flags.valid) { 528 if (!trip) { 529 *type = THERMAL_TRIP_CRITICAL; 530 return 0; 531 } 532 trip--; 533 } 534 535 if (tz->trips.hot.flags.valid) { 536 if (!trip) { 537 *type = THERMAL_TRIP_HOT; 538 return 0; 539 } 540 trip--; 541 } 542 543 if (tz->trips.passive.flags.valid) { 544 if (!trip) { 545 *type = THERMAL_TRIP_PASSIVE; 546 return 0; 547 } 548 trip--; 549 } 550 551 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 552 tz->trips.active[i].flags.valid; i++) { 553 if (!trip) { 554 *type = THERMAL_TRIP_ACTIVE; 555 return 0; 556 } 557 trip--; 558 } 559 560 return -EINVAL; 561 } 562 563 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 564 int trip, int *temp) 565 { 566 struct acpi_thermal *tz = thermal->devdata; 567 int i; 568 569 if (!tz || trip < 0) 570 return -EINVAL; 571 572 if (tz->trips.critical.flags.valid) { 573 if (!trip) { 574 *temp = deci_kelvin_to_millicelsius_with_offset( 575 tz->trips.critical.temperature, 576 tz->kelvin_offset); 577 return 0; 578 } 579 trip--; 580 } 581 582 if (tz->trips.hot.flags.valid) { 583 if (!trip) { 584 *temp = deci_kelvin_to_millicelsius_with_offset( 585 tz->trips.hot.temperature, 586 tz->kelvin_offset); 587 return 0; 588 } 589 trip--; 590 } 591 592 if (tz->trips.passive.flags.valid) { 593 if (!trip) { 594 *temp = deci_kelvin_to_millicelsius_with_offset( 595 tz->trips.passive.temperature, 596 tz->kelvin_offset); 597 return 0; 598 } 599 trip--; 600 } 601 602 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 603 tz->trips.active[i].flags.valid; i++) { 604 if (!trip) { 605 *temp = deci_kelvin_to_millicelsius_with_offset( 606 tz->trips.active[i].temperature, 607 tz->kelvin_offset); 608 return 0; 609 } 610 trip--; 611 } 612 613 return -EINVAL; 614 } 615 616 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 617 int *temperature) 618 { 619 struct acpi_thermal *tz = thermal->devdata; 620 621 if (tz->trips.critical.flags.valid) { 622 *temperature = deci_kelvin_to_millicelsius_with_offset( 623 tz->trips.critical.temperature, 624 tz->kelvin_offset); 625 return 0; 626 } else 627 return -EINVAL; 628 } 629 630 static int thermal_get_trend(struct thermal_zone_device *thermal, 631 int trip, enum thermal_trend *trend) 632 { 633 struct acpi_thermal *tz = thermal->devdata; 634 enum thermal_trip_type type; 635 int i; 636 637 if (thermal_get_trip_type(thermal, trip, &type)) 638 return -EINVAL; 639 640 if (type == THERMAL_TRIP_ACTIVE) { 641 int trip_temp; 642 int temp = deci_kelvin_to_millicelsius_with_offset( 643 tz->temperature, tz->kelvin_offset); 644 if (thermal_get_trip_temp(thermal, trip, &trip_temp)) 645 return -EINVAL; 646 647 if (temp > trip_temp) { 648 *trend = THERMAL_TREND_RAISING; 649 return 0; 650 } else { 651 /* Fall back on default trend */ 652 return -EINVAL; 653 } 654 } 655 656 /* 657 * tz->temperature has already been updated by generic thermal layer, 658 * before this callback being invoked 659 */ 660 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature)) 661 + (tz->trips.passive.tc2 662 * (tz->temperature - tz->trips.passive.temperature)); 663 664 if (i > 0) 665 *trend = THERMAL_TREND_RAISING; 666 else if (i < 0) 667 *trend = THERMAL_TREND_DROPPING; 668 else 669 *trend = THERMAL_TREND_STABLE; 670 return 0; 671 } 672 673 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal) 674 { 675 struct acpi_thermal *tz = thermal->devdata; 676 677 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 678 dev_name(&tz->device->dev), 679 ACPI_THERMAL_NOTIFY_HOT, 1); 680 } 681 682 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal) 683 { 684 struct acpi_thermal *tz = thermal->devdata; 685 686 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 687 dev_name(&tz->device->dev), 688 ACPI_THERMAL_NOTIFY_CRITICAL, 1); 689 690 thermal_zone_device_critical(thermal); 691 } 692 693 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 694 struct thermal_cooling_device *cdev, 695 bool bind) 696 { 697 struct acpi_device *device = cdev->devdata; 698 struct acpi_thermal *tz = thermal->devdata; 699 struct acpi_device *dev; 700 acpi_handle handle; 701 int i; 702 int j; 703 int trip = -1; 704 int result = 0; 705 706 if (tz->trips.critical.flags.valid) 707 trip++; 708 709 if (tz->trips.hot.flags.valid) 710 trip++; 711 712 if (tz->trips.passive.flags.valid) { 713 trip++; 714 for (i = 0; i < tz->trips.passive.devices.count; 715 i++) { 716 handle = tz->trips.passive.devices.handles[i]; 717 dev = acpi_fetch_acpi_dev(handle); 718 if (dev != device) 719 continue; 720 if (bind) 721 result = 722 thermal_zone_bind_cooling_device 723 (thermal, trip, cdev, 724 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 725 THERMAL_WEIGHT_DEFAULT); 726 else 727 result = 728 thermal_zone_unbind_cooling_device 729 (thermal, trip, cdev); 730 if (result) 731 goto failed; 732 } 733 } 734 735 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 736 if (!tz->trips.active[i].flags.valid) 737 break; 738 trip++; 739 for (j = 0; 740 j < tz->trips.active[i].devices.count; 741 j++) { 742 handle = tz->trips.active[i].devices.handles[j]; 743 dev = acpi_fetch_acpi_dev(handle); 744 if (dev != device) 745 continue; 746 if (bind) 747 result = thermal_zone_bind_cooling_device 748 (thermal, trip, cdev, 749 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 750 THERMAL_WEIGHT_DEFAULT); 751 else 752 result = thermal_zone_unbind_cooling_device 753 (thermal, trip, cdev); 754 if (result) 755 goto failed; 756 } 757 } 758 759 failed: 760 return result; 761 } 762 763 static int 764 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 765 struct thermal_cooling_device *cdev) 766 { 767 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 768 } 769 770 static int 771 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 772 struct thermal_cooling_device *cdev) 773 { 774 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 775 } 776 777 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 778 .bind = acpi_thermal_bind_cooling_device, 779 .unbind = acpi_thermal_unbind_cooling_device, 780 .get_temp = thermal_get_temp, 781 .get_trip_type = thermal_get_trip_type, 782 .get_trip_temp = thermal_get_trip_temp, 783 .get_crit_temp = thermal_get_crit_temp, 784 .get_trend = thermal_get_trend, 785 .hot = acpi_thermal_zone_device_hot, 786 .critical = acpi_thermal_zone_device_critical, 787 }; 788 789 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 790 { 791 int trips = 0; 792 int result; 793 acpi_status status; 794 int i; 795 796 if (tz->trips.critical.flags.valid) 797 trips++; 798 799 if (tz->trips.hot.flags.valid) 800 trips++; 801 802 if (tz->trips.passive.flags.valid) 803 trips++; 804 805 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 806 tz->trips.active[i].flags.valid; i++, trips++); 807 808 if (tz->trips.passive.flags.valid) 809 tz->thermal_zone = 810 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 if (IS_ERR(tz->thermal_zone)) 820 return -ENODEV; 821 822 result = sysfs_create_link(&tz->device->dev.kobj, 823 &tz->thermal_zone->device.kobj, "thermal_zone"); 824 if (result) 825 goto unregister_tzd; 826 827 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 828 &tz->device->dev.kobj, "device"); 829 if (result) 830 goto remove_tz_link; 831 832 status = acpi_bus_attach_private_data(tz->device->handle, 833 tz->thermal_zone); 834 if (ACPI_FAILURE(status)) { 835 result = -ENODEV; 836 goto remove_dev_link; 837 } 838 839 result = thermal_zone_device_enable(tz->thermal_zone); 840 if (result) 841 goto acpi_bus_detach; 842 843 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 844 tz->thermal_zone->id); 845 846 return 0; 847 848 acpi_bus_detach: 849 acpi_bus_detach_private_data(tz->device->handle); 850 remove_dev_link: 851 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 852 remove_tz_link: 853 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 854 unregister_tzd: 855 thermal_zone_device_unregister(tz->thermal_zone); 856 857 return result; 858 } 859 860 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 861 { 862 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 863 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 864 thermal_zone_device_unregister(tz->thermal_zone); 865 tz->thermal_zone = NULL; 866 acpi_bus_detach_private_data(tz->device->handle); 867 } 868 869 870 /* -------------------------------------------------------------------------- 871 Driver Interface 872 -------------------------------------------------------------------------- */ 873 874 static void acpi_queue_thermal_check(struct acpi_thermal *tz) 875 { 876 if (!work_pending(&tz->thermal_check_work)) 877 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); 878 } 879 880 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 881 { 882 struct acpi_thermal *tz = acpi_driver_data(device); 883 884 885 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 = 0; 946 947 948 if (!tz) 949 return -EINVAL; 950 951 acpi_thermal_aml_dependency_fix(tz); 952 953 /* Get trip points [_CRT, _PSV, etc.] (required) */ 954 result = acpi_thermal_get_trip_points(tz); 955 if (result) 956 return result; 957 958 /* Get temperature [_TMP] (required) */ 959 result = acpi_thermal_get_temperature(tz); 960 if (result) 961 return result; 962 963 /* Set the cooling mode [_SCP] to active cooling (default) */ 964 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 965 if (!result) 966 tz->flags.cooling_mode = 1; 967 968 /* Get default polling frequency [_TZP] (optional) */ 969 if (tzp) 970 tz->polling_frequency = tzp; 971 else 972 acpi_thermal_get_polling_frequency(tz); 973 974 return 0; 975 } 976 977 /* 978 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 979 * handles temperature values with a single decimal place. As a consequence, 980 * some implementations use an offset of 273.1 and others use an offset of 981 * 273.2. Try to find out which one is being used, to present the most 982 * accurate and visually appealing number. 983 * 984 * The heuristic below should work for all ACPI thermal zones which have a 985 * critical trip point with a value being a multiple of 0.5 degree Celsius. 986 */ 987 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 988 { 989 if (tz->trips.critical.flags.valid && 990 (tz->trips.critical.temperature % 5) == 1) 991 tz->kelvin_offset = 273100; 992 else 993 tz->kelvin_offset = 273200; 994 } 995 996 static void acpi_thermal_check_fn(struct work_struct *work) 997 { 998 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 999 thermal_check_work); 1000 1001 /* 1002 * In general, it is not sufficient to check the pending bit, because 1003 * subsequent instances of this function may be queued after one of them 1004 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just 1005 * one of them is running, though, because it may have done the actual 1006 * check some time ago, so allow at least one of them to block on the 1007 * mutex while another one is running the update. 1008 */ 1009 if (!refcount_dec_not_one(&tz->thermal_check_count)) 1010 return; 1011 1012 mutex_lock(&tz->thermal_check_lock); 1013 1014 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED); 1015 1016 refcount_inc(&tz->thermal_check_count); 1017 1018 mutex_unlock(&tz->thermal_check_lock); 1019 } 1020 1021 static int acpi_thermal_add(struct acpi_device *device) 1022 { 1023 int result = 0; 1024 struct acpi_thermal *tz = NULL; 1025 1026 1027 if (!device) 1028 return -EINVAL; 1029 1030 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1031 if (!tz) 1032 return -ENOMEM; 1033 1034 tz->device = device; 1035 strcpy(tz->name, device->pnp.bus_id); 1036 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1037 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1038 device->driver_data = tz; 1039 1040 result = acpi_thermal_get_info(tz); 1041 if (result) 1042 goto free_memory; 1043 1044 acpi_thermal_guess_offset(tz); 1045 1046 result = acpi_thermal_register_thermal_zone(tz); 1047 if (result) 1048 goto free_memory; 1049 1050 refcount_set(&tz->thermal_check_count, 3); 1051 mutex_init(&tz->thermal_check_lock); 1052 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1053 1054 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device), 1055 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature)); 1056 goto end; 1057 1058 free_memory: 1059 kfree(tz); 1060 end: 1061 return result; 1062 } 1063 1064 static int acpi_thermal_remove(struct acpi_device *device) 1065 { 1066 struct acpi_thermal *tz = NULL; 1067 1068 if (!device || !acpi_driver_data(device)) 1069 return -EINVAL; 1070 1071 flush_workqueue(acpi_thermal_pm_queue); 1072 tz = acpi_driver_data(device); 1073 1074 acpi_thermal_unregister_thermal_zone(tz); 1075 kfree(tz); 1076 return 0; 1077 } 1078 1079 #ifdef CONFIG_PM_SLEEP 1080 static int acpi_thermal_suspend(struct device *dev) 1081 { 1082 /* Make sure the previously queued thermal check work has been done */ 1083 flush_workqueue(acpi_thermal_pm_queue); 1084 return 0; 1085 } 1086 1087 static int acpi_thermal_resume(struct device *dev) 1088 { 1089 struct acpi_thermal *tz; 1090 int i, j, power_state, result; 1091 1092 if (!dev) 1093 return -EINVAL; 1094 1095 tz = acpi_driver_data(to_acpi_device(dev)); 1096 if (!tz) 1097 return -EINVAL; 1098 1099 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1100 if (!tz->trips.active[i].flags.valid) 1101 break; 1102 tz->trips.active[i].flags.enabled = 1; 1103 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1104 result = acpi_bus_update_power( 1105 tz->trips.active[i].devices.handles[j], 1106 &power_state); 1107 if (result || (power_state != ACPI_STATE_D0)) { 1108 tz->trips.active[i].flags.enabled = 0; 1109 break; 1110 } 1111 } 1112 tz->state.active |= tz->trips.active[i].flags.enabled; 1113 } 1114 1115 acpi_queue_thermal_check(tz); 1116 1117 return AE_OK; 1118 } 1119 #endif 1120 1121 static int thermal_act(const struct dmi_system_id *d) { 1122 1123 if (act == 0) { 1124 pr_notice("%s detected: disabling all active thermal trip points\n", 1125 d->ident); 1126 act = -1; 1127 } 1128 return 0; 1129 } 1130 static int thermal_nocrt(const struct dmi_system_id *d) { 1131 1132 pr_notice("%s detected: disabling all critical thermal trip point actions.\n", 1133 d->ident); 1134 nocrt = 1; 1135 return 0; 1136 } 1137 static int thermal_tzp(const struct dmi_system_id *d) { 1138 1139 if (tzp == 0) { 1140 pr_notice("%s detected: enabling thermal zone polling\n", 1141 d->ident); 1142 tzp = 300; /* 300 dS = 30 Seconds */ 1143 } 1144 return 0; 1145 } 1146 static int thermal_psv(const struct dmi_system_id *d) { 1147 1148 if (psv == 0) { 1149 pr_notice("%s detected: disabling all passive thermal trip points\n", 1150 d->ident); 1151 psv = -1; 1152 } 1153 return 0; 1154 } 1155 1156 static const struct dmi_system_id thermal_dmi_table[] __initconst = { 1157 /* 1158 * Award BIOS on this AOpen makes thermal control almost worthless. 1159 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1160 */ 1161 { 1162 .callback = thermal_act, 1163 .ident = "AOpen i915GMm-HFS", 1164 .matches = { 1165 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1166 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1167 }, 1168 }, 1169 { 1170 .callback = thermal_psv, 1171 .ident = "AOpen i915GMm-HFS", 1172 .matches = { 1173 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1174 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1175 }, 1176 }, 1177 { 1178 .callback = thermal_tzp, 1179 .ident = "AOpen i915GMm-HFS", 1180 .matches = { 1181 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1182 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1183 }, 1184 }, 1185 { 1186 .callback = thermal_nocrt, 1187 .ident = "Gigabyte GA-7ZX", 1188 .matches = { 1189 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1190 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1191 }, 1192 }, 1193 {} 1194 }; 1195 1196 static int __init acpi_thermal_init(void) 1197 { 1198 int result = 0; 1199 1200 dmi_check_system(thermal_dmi_table); 1201 1202 if (off) { 1203 pr_notice("thermal control disabled\n"); 1204 return -ENODEV; 1205 } 1206 1207 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", 1208 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); 1209 if (!acpi_thermal_pm_queue) 1210 return -ENODEV; 1211 1212 result = acpi_bus_register_driver(&acpi_thermal_driver); 1213 if (result < 0) { 1214 destroy_workqueue(acpi_thermal_pm_queue); 1215 return -ENODEV; 1216 } 1217 1218 return 0; 1219 } 1220 1221 static void __exit acpi_thermal_exit(void) 1222 { 1223 acpi_bus_unregister_driver(&acpi_thermal_driver); 1224 destroy_workqueue(acpi_thermal_pm_queue); 1225 1226 return; 1227 } 1228 1229 module_init(acpi_thermal_init); 1230 module_exit(acpi_thermal_exit); 1231