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