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_status status; 701 acpi_handle handle; 702 int i; 703 int j; 704 int trip = -1; 705 int result = 0; 706 707 if (tz->trips.critical.flags.valid) 708 trip++; 709 710 if (tz->trips.hot.flags.valid) 711 trip++; 712 713 if (tz->trips.passive.flags.valid) { 714 trip++; 715 for (i = 0; i < tz->trips.passive.devices.count; 716 i++) { 717 handle = tz->trips.passive.devices.handles[i]; 718 status = acpi_bus_get_device(handle, &dev); 719 if (ACPI_FAILURE(status) || dev != device) 720 continue; 721 if (bind) 722 result = 723 thermal_zone_bind_cooling_device 724 (thermal, trip, cdev, 725 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 726 THERMAL_WEIGHT_DEFAULT); 727 else 728 result = 729 thermal_zone_unbind_cooling_device 730 (thermal, trip, cdev); 731 if (result) 732 goto failed; 733 } 734 } 735 736 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 737 if (!tz->trips.active[i].flags.valid) 738 break; 739 trip++; 740 for (j = 0; 741 j < tz->trips.active[i].devices.count; 742 j++) { 743 handle = tz->trips.active[i].devices.handles[j]; 744 status = acpi_bus_get_device(handle, &dev); 745 if (ACPI_FAILURE(status) || dev != device) 746 continue; 747 if (bind) 748 result = thermal_zone_bind_cooling_device 749 (thermal, trip, cdev, 750 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 751 THERMAL_WEIGHT_DEFAULT); 752 else 753 result = thermal_zone_unbind_cooling_device 754 (thermal, trip, cdev); 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 && 807 tz->trips.active[i].flags.valid; i++, trips++); 808 809 if (tz->trips.passive.flags.valid) 810 tz->thermal_zone = 811 thermal_zone_device_register("acpitz", trips, 0, tz, 812 &acpi_thermal_zone_ops, NULL, 813 tz->trips.passive.tsp*100, 814 tz->polling_frequency*100); 815 else 816 tz->thermal_zone = 817 thermal_zone_device_register("acpitz", trips, 0, tz, 818 &acpi_thermal_zone_ops, NULL, 819 0, tz->polling_frequency*100); 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); 884 885 886 if (!tz) 887 return; 888 889 switch (event) { 890 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 891 acpi_queue_thermal_check(tz); 892 break; 893 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 894 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 895 acpi_queue_thermal_check(tz); 896 acpi_bus_generate_netlink_event(device->pnp.device_class, 897 dev_name(&device->dev), event, 0); 898 break; 899 case ACPI_THERMAL_NOTIFY_DEVICES: 900 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 901 acpi_queue_thermal_check(tz); 902 acpi_bus_generate_netlink_event(device->pnp.device_class, 903 dev_name(&device->dev), event, 0); 904 break; 905 default: 906 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 907 event); 908 break; 909 } 910 } 911 912 /* 913 * On some platforms, the AML code has dependency about 914 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 915 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 916 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 917 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 918 * if _TMP has never been evaluated. 919 * 920 * As this dependency is totally transparent to OS, evaluate 921 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 922 * _TMP, before they are actually used. 923 */ 924 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 925 { 926 acpi_handle handle = tz->device->handle; 927 unsigned long long value; 928 int i; 929 930 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 931 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 932 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 933 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 934 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 935 acpi_status status; 936 937 status = acpi_evaluate_integer(handle, name, NULL, &value); 938 if (status == AE_NOT_FOUND) 939 break; 940 } 941 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 942 } 943 944 static int acpi_thermal_get_info(struct acpi_thermal *tz) 945 { 946 int result = 0; 947 948 949 if (!tz) 950 return -EINVAL; 951 952 acpi_thermal_aml_dependency_fix(tz); 953 954 /* Get trip points [_CRT, _PSV, etc.] (required) */ 955 result = acpi_thermal_get_trip_points(tz); 956 if (result) 957 return result; 958 959 /* Get temperature [_TMP] (required) */ 960 result = acpi_thermal_get_temperature(tz); 961 if (result) 962 return result; 963 964 /* Set the cooling mode [_SCP] to active cooling (default) */ 965 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 966 if (!result) 967 tz->flags.cooling_mode = 1; 968 969 /* Get default polling frequency [_TZP] (optional) */ 970 if (tzp) 971 tz->polling_frequency = tzp; 972 else 973 acpi_thermal_get_polling_frequency(tz); 974 975 return 0; 976 } 977 978 /* 979 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 980 * handles temperature values with a single decimal place. As a consequence, 981 * some implementations use an offset of 273.1 and others use an offset of 982 * 273.2. Try to find out which one is being used, to present the most 983 * accurate and visually appealing number. 984 * 985 * The heuristic below should work for all ACPI thermal zones which have a 986 * critical trip point with a value being a multiple of 0.5 degree Celsius. 987 */ 988 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 989 { 990 if (tz->trips.critical.flags.valid && 991 (tz->trips.critical.temperature % 5) == 1) 992 tz->kelvin_offset = 273100; 993 else 994 tz->kelvin_offset = 273200; 995 } 996 997 static void acpi_thermal_check_fn(struct work_struct *work) 998 { 999 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 1000 thermal_check_work); 1001 1002 /* 1003 * In general, it is not sufficient to check the pending bit, because 1004 * subsequent instances of this function may be queued after one of them 1005 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just 1006 * one of them is running, though, because it may have done the actual 1007 * check some time ago, so allow at least one of them to block on the 1008 * mutex while another one is running the update. 1009 */ 1010 if (!refcount_dec_not_one(&tz->thermal_check_count)) 1011 return; 1012 1013 mutex_lock(&tz->thermal_check_lock); 1014 1015 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED); 1016 1017 refcount_inc(&tz->thermal_check_count); 1018 1019 mutex_unlock(&tz->thermal_check_lock); 1020 } 1021 1022 static int acpi_thermal_add(struct acpi_device *device) 1023 { 1024 int result = 0; 1025 struct acpi_thermal *tz = NULL; 1026 1027 1028 if (!device) 1029 return -EINVAL; 1030 1031 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1032 if (!tz) 1033 return -ENOMEM; 1034 1035 tz->device = device; 1036 strcpy(tz->name, device->pnp.bus_id); 1037 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1038 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1039 device->driver_data = tz; 1040 1041 result = acpi_thermal_get_info(tz); 1042 if (result) 1043 goto free_memory; 1044 1045 acpi_thermal_guess_offset(tz); 1046 1047 result = acpi_thermal_register_thermal_zone(tz); 1048 if (result) 1049 goto free_memory; 1050 1051 refcount_set(&tz->thermal_check_count, 3); 1052 mutex_init(&tz->thermal_check_lock); 1053 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1054 1055 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device), 1056 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature)); 1057 goto end; 1058 1059 free_memory: 1060 kfree(tz); 1061 end: 1062 return result; 1063 } 1064 1065 static int acpi_thermal_remove(struct acpi_device *device) 1066 { 1067 struct acpi_thermal *tz = NULL; 1068 1069 if (!device || !acpi_driver_data(device)) 1070 return -EINVAL; 1071 1072 flush_workqueue(acpi_thermal_pm_queue); 1073 tz = acpi_driver_data(device); 1074 1075 acpi_thermal_unregister_thermal_zone(tz); 1076 kfree(tz); 1077 return 0; 1078 } 1079 1080 #ifdef CONFIG_PM_SLEEP 1081 static int acpi_thermal_suspend(struct device *dev) 1082 { 1083 /* Make sure the previously queued thermal check work has been done */ 1084 flush_workqueue(acpi_thermal_pm_queue); 1085 return 0; 1086 } 1087 1088 static int acpi_thermal_resume(struct device *dev) 1089 { 1090 struct acpi_thermal *tz; 1091 int i, j, power_state, result; 1092 1093 if (!dev) 1094 return -EINVAL; 1095 1096 tz = acpi_driver_data(to_acpi_device(dev)); 1097 if (!tz) 1098 return -EINVAL; 1099 1100 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1101 if (!(&tz->trips.active[i])) 1102 break; 1103 if (!tz->trips.active[i].flags.valid) 1104 break; 1105 tz->trips.active[i].flags.enabled = 1; 1106 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1107 result = acpi_bus_update_power( 1108 tz->trips.active[i].devices.handles[j], 1109 &power_state); 1110 if (result || (power_state != ACPI_STATE_D0)) { 1111 tz->trips.active[i].flags.enabled = 0; 1112 break; 1113 } 1114 } 1115 tz->state.active |= tz->trips.active[i].flags.enabled; 1116 } 1117 1118 acpi_queue_thermal_check(tz); 1119 1120 return AE_OK; 1121 } 1122 #endif 1123 1124 static int thermal_act(const struct dmi_system_id *d) { 1125 1126 if (act == 0) { 1127 pr_notice("%s detected: disabling all active thermal trip points\n", 1128 d->ident); 1129 act = -1; 1130 } 1131 return 0; 1132 } 1133 static int thermal_nocrt(const struct dmi_system_id *d) { 1134 1135 pr_notice("%s detected: disabling all critical thermal trip point actions.\n", 1136 d->ident); 1137 nocrt = 1; 1138 return 0; 1139 } 1140 static int thermal_tzp(const struct dmi_system_id *d) { 1141 1142 if (tzp == 0) { 1143 pr_notice("%s detected: enabling thermal zone polling\n", 1144 d->ident); 1145 tzp = 300; /* 300 dS = 30 Seconds */ 1146 } 1147 return 0; 1148 } 1149 static int thermal_psv(const struct dmi_system_id *d) { 1150 1151 if (psv == 0) { 1152 pr_notice("%s detected: disabling all passive thermal trip points\n", 1153 d->ident); 1154 psv = -1; 1155 } 1156 return 0; 1157 } 1158 1159 static const struct dmi_system_id thermal_dmi_table[] __initconst = { 1160 /* 1161 * Award BIOS on this AOpen makes thermal control almost worthless. 1162 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1163 */ 1164 { 1165 .callback = thermal_act, 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_psv, 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_tzp, 1182 .ident = "AOpen i915GMm-HFS", 1183 .matches = { 1184 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1185 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1186 }, 1187 }, 1188 { 1189 .callback = thermal_nocrt, 1190 .ident = "Gigabyte GA-7ZX", 1191 .matches = { 1192 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1193 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1194 }, 1195 }, 1196 {} 1197 }; 1198 1199 static int __init acpi_thermal_init(void) 1200 { 1201 int result = 0; 1202 1203 dmi_check_system(thermal_dmi_table); 1204 1205 if (off) { 1206 pr_notice("thermal control disabled\n"); 1207 return -ENODEV; 1208 } 1209 1210 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", 1211 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); 1212 if (!acpi_thermal_pm_queue) 1213 return -ENODEV; 1214 1215 result = acpi_bus_register_driver(&acpi_thermal_driver); 1216 if (result < 0) { 1217 destroy_workqueue(acpi_thermal_pm_queue); 1218 return -ENODEV; 1219 } 1220 1221 return 0; 1222 } 1223 1224 static void __exit acpi_thermal_exit(void) 1225 { 1226 acpi_bus_unregister_driver(&acpi_thermal_driver); 1227 destroy_workqueue(acpi_thermal_pm_queue); 1228 1229 return; 1230 } 1231 1232 module_init(acpi_thermal_init); 1233 module_exit(acpi_thermal_exit); 1234