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 } 672 673 674 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 675 enum thermal_trip_type trip_type) 676 { 677 u8 type = 0; 678 struct acpi_thermal *tz = thermal->devdata; 679 680 if (trip_type == THERMAL_TRIP_CRITICAL) 681 type = ACPI_THERMAL_NOTIFY_CRITICAL; 682 else if (trip_type == THERMAL_TRIP_HOT) 683 type = ACPI_THERMAL_NOTIFY_HOT; 684 else 685 return 0; 686 687 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 688 dev_name(&tz->device->dev), type, 1); 689 690 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 691 return 1; 692 693 return 0; 694 } 695 696 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 697 struct thermal_cooling_device *cdev, 698 bool bind) 699 { 700 struct acpi_device *device = cdev->devdata; 701 struct acpi_thermal *tz = thermal->devdata; 702 struct acpi_device *dev; 703 acpi_status status; 704 acpi_handle handle; 705 int i; 706 int j; 707 int trip = -1; 708 int result = 0; 709 710 if (tz->trips.critical.flags.valid) 711 trip++; 712 713 if (tz->trips.hot.flags.valid) 714 trip++; 715 716 if (tz->trips.passive.flags.valid) { 717 trip++; 718 for (i = 0; i < tz->trips.passive.devices.count; 719 i++) { 720 handle = tz->trips.passive.devices.handles[i]; 721 status = acpi_bus_get_device(handle, &dev); 722 if (ACPI_FAILURE(status) || dev != device) 723 continue; 724 if (bind) 725 result = 726 thermal_zone_bind_cooling_device 727 (thermal, trip, cdev, 728 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 729 THERMAL_WEIGHT_DEFAULT); 730 else 731 result = 732 thermal_zone_unbind_cooling_device 733 (thermal, trip, cdev); 734 if (result) 735 goto failed; 736 } 737 } 738 739 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 740 if (!tz->trips.active[i].flags.valid) 741 break; 742 trip++; 743 for (j = 0; 744 j < tz->trips.active[i].devices.count; 745 j++) { 746 handle = tz->trips.active[i].devices.handles[j]; 747 status = acpi_bus_get_device(handle, &dev); 748 if (ACPI_FAILURE(status) || dev != device) 749 continue; 750 if (bind) 751 result = thermal_zone_bind_cooling_device 752 (thermal, trip, cdev, 753 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 754 THERMAL_WEIGHT_DEFAULT); 755 else 756 result = thermal_zone_unbind_cooling_device 757 (thermal, trip, cdev); 758 if (result) 759 goto failed; 760 } 761 } 762 763 for (i = 0; i < tz->devices.count; i++) { 764 handle = tz->devices.handles[i]; 765 status = acpi_bus_get_device(handle, &dev); 766 if (ACPI_SUCCESS(status) && (dev == device)) { 767 if (bind) 768 result = thermal_zone_bind_cooling_device 769 (thermal, THERMAL_TRIPS_NONE, 770 cdev, THERMAL_NO_LIMIT, 771 THERMAL_NO_LIMIT, 772 THERMAL_WEIGHT_DEFAULT); 773 else 774 result = thermal_zone_unbind_cooling_device 775 (thermal, THERMAL_TRIPS_NONE, 776 cdev); 777 if (result) 778 goto failed; 779 } 780 } 781 782 failed: 783 return result; 784 } 785 786 static int 787 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 788 struct thermal_cooling_device *cdev) 789 { 790 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 791 } 792 793 static int 794 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 795 struct thermal_cooling_device *cdev) 796 { 797 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 798 } 799 800 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 801 .bind = acpi_thermal_bind_cooling_device, 802 .unbind = acpi_thermal_unbind_cooling_device, 803 .get_temp = thermal_get_temp, 804 .get_trip_type = thermal_get_trip_type, 805 .get_trip_temp = thermal_get_trip_temp, 806 .get_crit_temp = thermal_get_crit_temp, 807 .get_trend = thermal_get_trend, 808 .notify = thermal_notify, 809 }; 810 811 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 812 { 813 int trips = 0; 814 int result; 815 acpi_status status; 816 int i; 817 818 if (tz->trips.critical.flags.valid) 819 trips++; 820 821 if (tz->trips.hot.flags.valid) 822 trips++; 823 824 if (tz->trips.passive.flags.valid) 825 trips++; 826 827 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 828 tz->trips.active[i].flags.valid; i++, trips++); 829 830 if (tz->trips.passive.flags.valid) 831 tz->thermal_zone = 832 thermal_zone_device_register("acpitz", trips, 0, tz, 833 &acpi_thermal_zone_ops, NULL, 834 tz->trips.passive.tsp*100, 835 tz->polling_frequency*100); 836 else 837 tz->thermal_zone = 838 thermal_zone_device_register("acpitz", trips, 0, tz, 839 &acpi_thermal_zone_ops, NULL, 840 0, tz->polling_frequency*100); 841 if (IS_ERR(tz->thermal_zone)) 842 return -ENODEV; 843 844 result = sysfs_create_link(&tz->device->dev.kobj, 845 &tz->thermal_zone->device.kobj, "thermal_zone"); 846 if (result) 847 goto unregister_tzd; 848 849 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 850 &tz->device->dev.kobj, "device"); 851 if (result) 852 goto remove_tz_link; 853 854 status = acpi_bus_attach_private_data(tz->device->handle, 855 tz->thermal_zone); 856 if (ACPI_FAILURE(status)) { 857 result = -ENODEV; 858 goto remove_dev_link; 859 } 860 861 result = thermal_zone_device_enable(tz->thermal_zone); 862 if (result) 863 goto acpi_bus_detach; 864 865 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 866 tz->thermal_zone->id); 867 868 return 0; 869 870 acpi_bus_detach: 871 acpi_bus_detach_private_data(tz->device->handle); 872 remove_dev_link: 873 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 874 remove_tz_link: 875 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 876 unregister_tzd: 877 thermal_zone_device_unregister(tz->thermal_zone); 878 879 return result; 880 } 881 882 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 883 { 884 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 885 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 886 thermal_zone_device_unregister(tz->thermal_zone); 887 tz->thermal_zone = NULL; 888 acpi_bus_detach_private_data(tz->device->handle); 889 } 890 891 892 /* -------------------------------------------------------------------------- 893 Driver Interface 894 -------------------------------------------------------------------------- */ 895 896 static void acpi_queue_thermal_check(struct acpi_thermal *tz) 897 { 898 if (!work_pending(&tz->thermal_check_work)) 899 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); 900 } 901 902 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 903 { 904 struct acpi_thermal *tz = acpi_driver_data(device); 905 906 907 if (!tz) 908 return; 909 910 switch (event) { 911 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 912 acpi_queue_thermal_check(tz); 913 break; 914 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 915 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 916 acpi_queue_thermal_check(tz); 917 acpi_bus_generate_netlink_event(device->pnp.device_class, 918 dev_name(&device->dev), event, 0); 919 break; 920 case ACPI_THERMAL_NOTIFY_DEVICES: 921 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 922 acpi_queue_thermal_check(tz); 923 acpi_bus_generate_netlink_event(device->pnp.device_class, 924 dev_name(&device->dev), event, 0); 925 break; 926 default: 927 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 928 event); 929 break; 930 } 931 } 932 933 /* 934 * On some platforms, the AML code has dependency about 935 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 936 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 937 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 938 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 939 * if _TMP has never been evaluated. 940 * 941 * As this dependency is totally transparent to OS, evaluate 942 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 943 * _TMP, before they are actually used. 944 */ 945 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 946 { 947 acpi_handle handle = tz->device->handle; 948 unsigned long long value; 949 int i; 950 951 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 952 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 953 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 954 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 955 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 956 acpi_status status; 957 958 status = acpi_evaluate_integer(handle, name, NULL, &value); 959 if (status == AE_NOT_FOUND) 960 break; 961 } 962 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 963 } 964 965 static int acpi_thermal_get_info(struct acpi_thermal *tz) 966 { 967 int result = 0; 968 969 970 if (!tz) 971 return -EINVAL; 972 973 acpi_thermal_aml_dependency_fix(tz); 974 975 /* Get trip points [_CRT, _PSV, etc.] (required) */ 976 result = acpi_thermal_get_trip_points(tz); 977 if (result) 978 return result; 979 980 /* Get temperature [_TMP] (required) */ 981 result = acpi_thermal_get_temperature(tz); 982 if (result) 983 return result; 984 985 /* Set the cooling mode [_SCP] to active cooling (default) */ 986 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 987 if (!result) 988 tz->flags.cooling_mode = 1; 989 990 /* Get default polling frequency [_TZP] (optional) */ 991 if (tzp) 992 tz->polling_frequency = tzp; 993 else 994 acpi_thermal_get_polling_frequency(tz); 995 996 return 0; 997 } 998 999 /* 1000 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1001 * handles temperature values with a single decimal place. As a consequence, 1002 * some implementations use an offset of 273.1 and others use an offset of 1003 * 273.2. Try to find out which one is being used, to present the most 1004 * accurate and visually appealing number. 1005 * 1006 * The heuristic below should work for all ACPI thermal zones which have a 1007 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1008 */ 1009 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1010 { 1011 if (tz->trips.critical.flags.valid && 1012 (tz->trips.critical.temperature % 5) == 1) 1013 tz->kelvin_offset = 273100; 1014 else 1015 tz->kelvin_offset = 273200; 1016 } 1017 1018 static void acpi_thermal_check_fn(struct work_struct *work) 1019 { 1020 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 1021 thermal_check_work); 1022 1023 /* 1024 * In general, it is not sufficient to check the pending bit, because 1025 * subsequent instances of this function may be queued after one of them 1026 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just 1027 * one of them is running, though, because it may have done the actual 1028 * check some time ago, so allow at least one of them to block on the 1029 * mutex while another one is running the update. 1030 */ 1031 if (!refcount_dec_not_one(&tz->thermal_check_count)) 1032 return; 1033 1034 mutex_lock(&tz->thermal_check_lock); 1035 1036 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED); 1037 1038 refcount_inc(&tz->thermal_check_count); 1039 1040 mutex_unlock(&tz->thermal_check_lock); 1041 } 1042 1043 static int acpi_thermal_add(struct acpi_device *device) 1044 { 1045 int result = 0; 1046 struct acpi_thermal *tz = NULL; 1047 1048 1049 if (!device) 1050 return -EINVAL; 1051 1052 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1053 if (!tz) 1054 return -ENOMEM; 1055 1056 tz->device = device; 1057 strcpy(tz->name, device->pnp.bus_id); 1058 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1059 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1060 device->driver_data = tz; 1061 1062 result = acpi_thermal_get_info(tz); 1063 if (result) 1064 goto free_memory; 1065 1066 acpi_thermal_guess_offset(tz); 1067 1068 result = acpi_thermal_register_thermal_zone(tz); 1069 if (result) 1070 goto free_memory; 1071 1072 refcount_set(&tz->thermal_check_count, 3); 1073 mutex_init(&tz->thermal_check_lock); 1074 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1075 1076 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device), 1077 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature)); 1078 goto end; 1079 1080 free_memory: 1081 kfree(tz); 1082 end: 1083 return result; 1084 } 1085 1086 static int acpi_thermal_remove(struct acpi_device *device) 1087 { 1088 struct acpi_thermal *tz = NULL; 1089 1090 if (!device || !acpi_driver_data(device)) 1091 return -EINVAL; 1092 1093 flush_workqueue(acpi_thermal_pm_queue); 1094 tz = acpi_driver_data(device); 1095 1096 acpi_thermal_unregister_thermal_zone(tz); 1097 kfree(tz); 1098 return 0; 1099 } 1100 1101 #ifdef CONFIG_PM_SLEEP 1102 static int acpi_thermal_suspend(struct device *dev) 1103 { 1104 /* Make sure the previously queued thermal check work has been done */ 1105 flush_workqueue(acpi_thermal_pm_queue); 1106 return 0; 1107 } 1108 1109 static int acpi_thermal_resume(struct device *dev) 1110 { 1111 struct acpi_thermal *tz; 1112 int i, j, power_state, result; 1113 1114 if (!dev) 1115 return -EINVAL; 1116 1117 tz = acpi_driver_data(to_acpi_device(dev)); 1118 if (!tz) 1119 return -EINVAL; 1120 1121 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1122 if (!(&tz->trips.active[i])) 1123 break; 1124 if (!tz->trips.active[i].flags.valid) 1125 break; 1126 tz->trips.active[i].flags.enabled = 1; 1127 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1128 result = acpi_bus_update_power( 1129 tz->trips.active[i].devices.handles[j], 1130 &power_state); 1131 if (result || (power_state != ACPI_STATE_D0)) { 1132 tz->trips.active[i].flags.enabled = 0; 1133 break; 1134 } 1135 } 1136 tz->state.active |= tz->trips.active[i].flags.enabled; 1137 } 1138 1139 acpi_queue_thermal_check(tz); 1140 1141 return AE_OK; 1142 } 1143 #endif 1144 1145 static int thermal_act(const struct dmi_system_id *d) { 1146 1147 if (act == 0) { 1148 pr_notice("%s detected: disabling all active thermal trip points\n", 1149 d->ident); 1150 act = -1; 1151 } 1152 return 0; 1153 } 1154 static int thermal_nocrt(const struct dmi_system_id *d) { 1155 1156 pr_notice("%s detected: disabling all critical thermal trip point actions.\n", 1157 d->ident); 1158 nocrt = 1; 1159 return 0; 1160 } 1161 static int thermal_tzp(const struct dmi_system_id *d) { 1162 1163 if (tzp == 0) { 1164 pr_notice("%s detected: enabling thermal zone polling\n", 1165 d->ident); 1166 tzp = 300; /* 300 dS = 30 Seconds */ 1167 } 1168 return 0; 1169 } 1170 static int thermal_psv(const struct dmi_system_id *d) { 1171 1172 if (psv == 0) { 1173 pr_notice("%s detected: disabling all passive thermal trip points\n", 1174 d->ident); 1175 psv = -1; 1176 } 1177 return 0; 1178 } 1179 1180 static const struct dmi_system_id thermal_dmi_table[] __initconst = { 1181 /* 1182 * Award BIOS on this AOpen makes thermal control almost worthless. 1183 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1184 */ 1185 { 1186 .callback = thermal_act, 1187 .ident = "AOpen i915GMm-HFS", 1188 .matches = { 1189 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1190 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1191 }, 1192 }, 1193 { 1194 .callback = thermal_psv, 1195 .ident = "AOpen i915GMm-HFS", 1196 .matches = { 1197 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1198 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1199 }, 1200 }, 1201 { 1202 .callback = thermal_tzp, 1203 .ident = "AOpen i915GMm-HFS", 1204 .matches = { 1205 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1206 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1207 }, 1208 }, 1209 { 1210 .callback = thermal_nocrt, 1211 .ident = "Gigabyte GA-7ZX", 1212 .matches = { 1213 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1214 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1215 }, 1216 }, 1217 {} 1218 }; 1219 1220 static int __init acpi_thermal_init(void) 1221 { 1222 int result = 0; 1223 1224 dmi_check_system(thermal_dmi_table); 1225 1226 if (off) { 1227 pr_notice("thermal control disabled\n"); 1228 return -ENODEV; 1229 } 1230 1231 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", 1232 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); 1233 if (!acpi_thermal_pm_queue) 1234 return -ENODEV; 1235 1236 result = acpi_bus_register_driver(&acpi_thermal_driver); 1237 if (result < 0) { 1238 destroy_workqueue(acpi_thermal_pm_queue); 1239 return -ENODEV; 1240 } 1241 1242 return 0; 1243 } 1244 1245 static void __exit acpi_thermal_exit(void) 1246 { 1247 acpi_bus_unregister_driver(&acpi_thermal_driver); 1248 destroy_workqueue(acpi_thermal_pm_queue); 1249 1250 return; 1251 } 1252 1253 module_init(acpi_thermal_init); 1254 module_exit(acpi_thermal_exit); 1255