1 /* 2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 20 * 21 * This driver fully implements the ACPI thermal policy as described in the 22 * ACPI 2.0 Specification. 23 * 24 * TBD: 1. Implement passive cooling hysteresis. 25 * 2. Enhance passive cooling (CPU) states/limit interface to support 26 * concepts of 'multiple limiters', upper/lower limits, etc. 27 * 28 */ 29 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/dmi.h> 33 #include <linux/init.h> 34 #include <linux/slab.h> 35 #include <linux/types.h> 36 #include <linux/jiffies.h> 37 #include <linux/kmod.h> 38 #include <linux/reboot.h> 39 #include <linux/device.h> 40 #include <linux/thermal.h> 41 #include <linux/acpi.h> 42 #include <linux/workqueue.h> 43 #include <asm/uaccess.h> 44 45 #define PREFIX "ACPI: " 46 47 #define ACPI_THERMAL_CLASS "thermal_zone" 48 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 49 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 50 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 51 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 52 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 53 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 54 #define ACPI_THERMAL_MODE_ACTIVE 0x00 55 56 #define ACPI_THERMAL_MAX_ACTIVE 10 57 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 58 59 #define _COMPONENT ACPI_THERMAL_COMPONENT 60 ACPI_MODULE_NAME("thermal"); 61 62 MODULE_AUTHOR("Paul Diefenbaugh"); 63 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 64 MODULE_LICENSE("GPL"); 65 66 static int act; 67 module_param(act, int, 0644); 68 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 69 70 static int crt; 71 module_param(crt, int, 0644); 72 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 73 74 static int tzp; 75 module_param(tzp, int, 0444); 76 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 77 78 static int nocrt; 79 module_param(nocrt, int, 0); 80 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 81 82 static int off; 83 module_param(off, int, 0); 84 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 85 86 static int psv; 87 module_param(psv, int, 0644); 88 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 89 90 static struct workqueue_struct *acpi_thermal_pm_queue; 91 92 static int acpi_thermal_add(struct acpi_device *device); 93 static int acpi_thermal_remove(struct acpi_device *device); 94 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 95 96 static const struct acpi_device_id thermal_device_ids[] = { 97 {ACPI_THERMAL_HID, 0}, 98 {"", 0}, 99 }; 100 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 101 102 #ifdef CONFIG_PM_SLEEP 103 static int acpi_thermal_suspend(struct device *dev); 104 static int acpi_thermal_resume(struct device *dev); 105 #else 106 #define acpi_thermal_suspend NULL 107 #define acpi_thermal_resume NULL 108 #endif 109 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume); 110 111 static struct acpi_driver acpi_thermal_driver = { 112 .name = "thermal", 113 .class = ACPI_THERMAL_CLASS, 114 .ids = thermal_device_ids, 115 .ops = { 116 .add = acpi_thermal_add, 117 .remove = acpi_thermal_remove, 118 .notify = acpi_thermal_notify, 119 }, 120 .drv.pm = &acpi_thermal_pm, 121 }; 122 123 struct acpi_thermal_state { 124 u8 critical:1; 125 u8 hot:1; 126 u8 passive:1; 127 u8 active:1; 128 u8 reserved:4; 129 int active_index; 130 }; 131 132 struct acpi_thermal_state_flags { 133 u8 valid:1; 134 u8 enabled:1; 135 u8 reserved:6; 136 }; 137 138 struct acpi_thermal_critical { 139 struct acpi_thermal_state_flags flags; 140 unsigned long temperature; 141 }; 142 143 struct acpi_thermal_hot { 144 struct acpi_thermal_state_flags flags; 145 unsigned long temperature; 146 }; 147 148 struct acpi_thermal_passive { 149 struct acpi_thermal_state_flags flags; 150 unsigned long temperature; 151 unsigned long tc1; 152 unsigned long tc2; 153 unsigned long tsp; 154 struct acpi_handle_list devices; 155 }; 156 157 struct acpi_thermal_active { 158 struct acpi_thermal_state_flags flags; 159 unsigned long temperature; 160 struct acpi_handle_list devices; 161 }; 162 163 struct acpi_thermal_trips { 164 struct acpi_thermal_critical critical; 165 struct acpi_thermal_hot hot; 166 struct acpi_thermal_passive passive; 167 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 168 }; 169 170 struct acpi_thermal_flags { 171 u8 cooling_mode:1; /* _SCP */ 172 u8 devices:1; /* _TZD */ 173 u8 reserved:6; 174 }; 175 176 struct acpi_thermal { 177 struct acpi_device * device; 178 acpi_bus_id name; 179 unsigned long temperature; 180 unsigned long last_temperature; 181 unsigned long polling_frequency; 182 volatile u8 zombie; 183 struct acpi_thermal_flags flags; 184 struct acpi_thermal_state state; 185 struct acpi_thermal_trips trips; 186 struct acpi_handle_list devices; 187 struct thermal_zone_device *thermal_zone; 188 int tz_enabled; 189 int kelvin_offset; 190 struct work_struct thermal_check_work; 191 }; 192 193 /* -------------------------------------------------------------------------- 194 Thermal Zone Management 195 -------------------------------------------------------------------------- */ 196 197 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 198 { 199 acpi_status status = AE_OK; 200 unsigned long long tmp; 201 202 if (!tz) 203 return -EINVAL; 204 205 tz->last_temperature = tz->temperature; 206 207 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 208 if (ACPI_FAILURE(status)) 209 return -ENODEV; 210 211 tz->temperature = tmp; 212 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 213 tz->temperature)); 214 215 return 0; 216 } 217 218 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 219 { 220 acpi_status status = AE_OK; 221 unsigned long long tmp; 222 223 if (!tz) 224 return -EINVAL; 225 226 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 227 if (ACPI_FAILURE(status)) 228 return -ENODEV; 229 230 tz->polling_frequency = tmp; 231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 232 tz->polling_frequency)); 233 234 return 0; 235 } 236 237 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 238 { 239 if (!tz) 240 return -EINVAL; 241 242 if (!acpi_has_method(tz->device->handle, "_SCP")) { 243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 244 return -ENODEV; 245 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle, 246 "_SCP", mode))) { 247 return -ENODEV; 248 } 249 250 return 0; 251 } 252 253 #define ACPI_TRIPS_CRITICAL 0x01 254 #define ACPI_TRIPS_HOT 0x02 255 #define ACPI_TRIPS_PASSIVE 0x04 256 #define ACPI_TRIPS_ACTIVE 0x08 257 #define ACPI_TRIPS_DEVICES 0x10 258 259 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 260 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 261 262 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 263 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 264 ACPI_TRIPS_DEVICES) 265 266 /* 267 * This exception is thrown out in two cases: 268 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 269 * when re-evaluating the AML code. 270 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 271 * We need to re-bind the cooling devices of a thermal zone when this occurs. 272 */ 273 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 274 do { \ 275 if (flags != ACPI_TRIPS_INIT) \ 276 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 277 "ACPI thermal trip point %s changed\n" \ 278 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \ 279 } while (0) 280 281 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 282 { 283 acpi_status status = AE_OK; 284 unsigned long long tmp; 285 struct acpi_handle_list devices; 286 int valid = 0; 287 int i; 288 289 /* Critical Shutdown */ 290 if (flag & ACPI_TRIPS_CRITICAL) { 291 status = acpi_evaluate_integer(tz->device->handle, 292 "_CRT", NULL, &tmp); 293 tz->trips.critical.temperature = tmp; 294 /* 295 * Treat freezing temperatures as invalid as well; some 296 * BIOSes return really low values and cause reboots at startup. 297 * Below zero (Celsius) values clearly aren't right for sure.. 298 * ... so lets discard those as invalid. 299 */ 300 if (ACPI_FAILURE(status)) { 301 tz->trips.critical.flags.valid = 0; 302 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 303 "No critical threshold\n")); 304 } else if (tmp <= 2732) { 305 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n", 306 tmp); 307 tz->trips.critical.flags.valid = 0; 308 } else { 309 tz->trips.critical.flags.valid = 1; 310 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 311 "Found critical threshold [%lu]\n", 312 tz->trips.critical.temperature)); 313 } 314 if (tz->trips.critical.flags.valid == 1) { 315 if (crt == -1) { 316 tz->trips.critical.flags.valid = 0; 317 } else if (crt > 0) { 318 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 319 /* 320 * Allow override critical threshold 321 */ 322 if (crt_k > tz->trips.critical.temperature) 323 pr_warn(PREFIX "Critical threshold %d C\n", 324 crt); 325 tz->trips.critical.temperature = crt_k; 326 } 327 } 328 } 329 330 /* Critical Sleep (optional) */ 331 if (flag & ACPI_TRIPS_HOT) { 332 status = acpi_evaluate_integer(tz->device->handle, 333 "_HOT", NULL, &tmp); 334 if (ACPI_FAILURE(status)) { 335 tz->trips.hot.flags.valid = 0; 336 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 337 "No hot threshold\n")); 338 } else { 339 tz->trips.hot.temperature = tmp; 340 tz->trips.hot.flags.valid = 1; 341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 342 "Found hot threshold [%lu]\n", 343 tz->trips.hot.temperature)); 344 } 345 } 346 347 /* Passive (optional) */ 348 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 349 (flag == ACPI_TRIPS_INIT)) { 350 valid = tz->trips.passive.flags.valid; 351 if (psv == -1) { 352 status = AE_SUPPORT; 353 } else if (psv > 0) { 354 tmp = CELSIUS_TO_KELVIN(psv); 355 status = AE_OK; 356 } else { 357 status = acpi_evaluate_integer(tz->device->handle, 358 "_PSV", NULL, &tmp); 359 } 360 361 if (ACPI_FAILURE(status)) 362 tz->trips.passive.flags.valid = 0; 363 else { 364 tz->trips.passive.temperature = tmp; 365 tz->trips.passive.flags.valid = 1; 366 if (flag == ACPI_TRIPS_INIT) { 367 status = acpi_evaluate_integer( 368 tz->device->handle, "_TC1", 369 NULL, &tmp); 370 if (ACPI_FAILURE(status)) 371 tz->trips.passive.flags.valid = 0; 372 else 373 tz->trips.passive.tc1 = tmp; 374 status = acpi_evaluate_integer( 375 tz->device->handle, "_TC2", 376 NULL, &tmp); 377 if (ACPI_FAILURE(status)) 378 tz->trips.passive.flags.valid = 0; 379 else 380 tz->trips.passive.tc2 = tmp; 381 status = acpi_evaluate_integer( 382 tz->device->handle, "_TSP", 383 NULL, &tmp); 384 if (ACPI_FAILURE(status)) 385 tz->trips.passive.flags.valid = 0; 386 else 387 tz->trips.passive.tsp = tmp; 388 } 389 } 390 } 391 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 392 memset(&devices, 0, sizeof(struct acpi_handle_list)); 393 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 394 NULL, &devices); 395 if (ACPI_FAILURE(status)) { 396 pr_warn(PREFIX "Invalid passive threshold\n"); 397 tz->trips.passive.flags.valid = 0; 398 } 399 else 400 tz->trips.passive.flags.valid = 1; 401 402 if (memcmp(&tz->trips.passive.devices, &devices, 403 sizeof(struct acpi_handle_list))) { 404 memcpy(&tz->trips.passive.devices, &devices, 405 sizeof(struct acpi_handle_list)); 406 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 407 } 408 } 409 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 410 if (valid != tz->trips.passive.flags.valid) 411 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 412 } 413 414 /* Active (optional) */ 415 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 416 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 417 valid = tz->trips.active[i].flags.valid; 418 419 if (act == -1) 420 break; /* disable all active trip points */ 421 422 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 423 tz->trips.active[i].flags.valid)) { 424 status = acpi_evaluate_integer(tz->device->handle, 425 name, NULL, &tmp); 426 if (ACPI_FAILURE(status)) { 427 tz->trips.active[i].flags.valid = 0; 428 if (i == 0) 429 break; 430 if (act <= 0) 431 break; 432 if (i == 1) 433 tz->trips.active[0].temperature = 434 CELSIUS_TO_KELVIN(act); 435 else 436 /* 437 * Don't allow override higher than 438 * the next higher trip point 439 */ 440 tz->trips.active[i - 1].temperature = 441 (tz->trips.active[i - 2].temperature < 442 CELSIUS_TO_KELVIN(act) ? 443 tz->trips.active[i - 2].temperature : 444 CELSIUS_TO_KELVIN(act)); 445 break; 446 } else { 447 tz->trips.active[i].temperature = tmp; 448 tz->trips.active[i].flags.valid = 1; 449 } 450 } 451 452 name[2] = 'L'; 453 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 454 memset(&devices, 0, sizeof(struct acpi_handle_list)); 455 status = acpi_evaluate_reference(tz->device->handle, 456 name, NULL, &devices); 457 if (ACPI_FAILURE(status)) { 458 pr_warn(PREFIX "Invalid active%d threshold\n", 459 i); 460 tz->trips.active[i].flags.valid = 0; 461 } 462 else 463 tz->trips.active[i].flags.valid = 1; 464 465 if (memcmp(&tz->trips.active[i].devices, &devices, 466 sizeof(struct acpi_handle_list))) { 467 memcpy(&tz->trips.active[i].devices, &devices, 468 sizeof(struct acpi_handle_list)); 469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 470 } 471 } 472 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 473 if (valid != tz->trips.active[i].flags.valid) 474 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 475 476 if (!tz->trips.active[i].flags.valid) 477 break; 478 } 479 480 if ((flag & ACPI_TRIPS_DEVICES) 481 && acpi_has_method(tz->device->handle, "_TZD")) { 482 memset(&devices, 0, sizeof(devices)); 483 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 484 NULL, &devices); 485 if (ACPI_SUCCESS(status) 486 && memcmp(&tz->devices, &devices, sizeof(devices))) { 487 tz->devices = devices; 488 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 489 } 490 } 491 492 return 0; 493 } 494 495 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 496 { 497 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 498 499 if (ret) 500 return ret; 501 502 valid = tz->trips.critical.flags.valid | 503 tz->trips.hot.flags.valid | 504 tz->trips.passive.flags.valid; 505 506 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 507 valid |= tz->trips.active[i].flags.valid; 508 509 if (!valid) { 510 pr_warn(FW_BUG "No valid trip found\n"); 511 return -ENODEV; 512 } 513 return 0; 514 } 515 516 static void acpi_thermal_check(void *data) 517 { 518 struct acpi_thermal *tz = data; 519 520 if (!tz->tz_enabled) 521 return; 522 523 thermal_zone_device_update(tz->thermal_zone); 524 } 525 526 /* sys I/F for generic thermal sysfs support */ 527 528 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) 529 { 530 struct acpi_thermal *tz = thermal->devdata; 531 int result; 532 533 if (!tz) 534 return -EINVAL; 535 536 result = acpi_thermal_get_temperature(tz); 537 if (result) 538 return result; 539 540 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature, 541 tz->kelvin_offset); 542 return 0; 543 } 544 545 static int thermal_get_mode(struct thermal_zone_device *thermal, 546 enum thermal_device_mode *mode) 547 { 548 struct acpi_thermal *tz = thermal->devdata; 549 550 if (!tz) 551 return -EINVAL; 552 553 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 554 THERMAL_DEVICE_DISABLED; 555 556 return 0; 557 } 558 559 static int thermal_set_mode(struct thermal_zone_device *thermal, 560 enum thermal_device_mode mode) 561 { 562 struct acpi_thermal *tz = thermal->devdata; 563 int enable; 564 565 if (!tz) 566 return -EINVAL; 567 568 /* 569 * enable/disable thermal management from ACPI thermal driver 570 */ 571 if (mode == THERMAL_DEVICE_ENABLED) 572 enable = 1; 573 else if (mode == THERMAL_DEVICE_DISABLED) { 574 enable = 0; 575 pr_warn("thermal zone will be disabled\n"); 576 } else 577 return -EINVAL; 578 579 if (enable != tz->tz_enabled) { 580 tz->tz_enabled = enable; 581 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 582 "%s kernel ACPI thermal control\n", 583 tz->tz_enabled ? "Enable" : "Disable")); 584 acpi_thermal_check(tz); 585 } 586 return 0; 587 } 588 589 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 590 int trip, enum thermal_trip_type *type) 591 { 592 struct acpi_thermal *tz = thermal->devdata; 593 int i; 594 595 if (!tz || trip < 0) 596 return -EINVAL; 597 598 if (tz->trips.critical.flags.valid) { 599 if (!trip) { 600 *type = THERMAL_TRIP_CRITICAL; 601 return 0; 602 } 603 trip--; 604 } 605 606 if (tz->trips.hot.flags.valid) { 607 if (!trip) { 608 *type = THERMAL_TRIP_HOT; 609 return 0; 610 } 611 trip--; 612 } 613 614 if (tz->trips.passive.flags.valid) { 615 if (!trip) { 616 *type = THERMAL_TRIP_PASSIVE; 617 return 0; 618 } 619 trip--; 620 } 621 622 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 623 tz->trips.active[i].flags.valid; i++) { 624 if (!trip) { 625 *type = THERMAL_TRIP_ACTIVE; 626 return 0; 627 } 628 trip--; 629 } 630 631 return -EINVAL; 632 } 633 634 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 635 int trip, int *temp) 636 { 637 struct acpi_thermal *tz = thermal->devdata; 638 int i; 639 640 if (!tz || trip < 0) 641 return -EINVAL; 642 643 if (tz->trips.critical.flags.valid) { 644 if (!trip) { 645 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 646 tz->trips.critical.temperature, 647 tz->kelvin_offset); 648 return 0; 649 } 650 trip--; 651 } 652 653 if (tz->trips.hot.flags.valid) { 654 if (!trip) { 655 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 656 tz->trips.hot.temperature, 657 tz->kelvin_offset); 658 return 0; 659 } 660 trip--; 661 } 662 663 if (tz->trips.passive.flags.valid) { 664 if (!trip) { 665 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 666 tz->trips.passive.temperature, 667 tz->kelvin_offset); 668 return 0; 669 } 670 trip--; 671 } 672 673 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 674 tz->trips.active[i].flags.valid; i++) { 675 if (!trip) { 676 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 677 tz->trips.active[i].temperature, 678 tz->kelvin_offset); 679 return 0; 680 } 681 trip--; 682 } 683 684 return -EINVAL; 685 } 686 687 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 688 int *temperature) 689 { 690 struct acpi_thermal *tz = thermal->devdata; 691 692 if (tz->trips.critical.flags.valid) { 693 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 694 tz->trips.critical.temperature, 695 tz->kelvin_offset); 696 return 0; 697 } else 698 return -EINVAL; 699 } 700 701 static int thermal_get_trend(struct thermal_zone_device *thermal, 702 int trip, enum thermal_trend *trend) 703 { 704 struct acpi_thermal *tz = thermal->devdata; 705 enum thermal_trip_type type; 706 int i; 707 708 if (thermal_get_trip_type(thermal, trip, &type)) 709 return -EINVAL; 710 711 if (type == THERMAL_TRIP_ACTIVE) { 712 int trip_temp; 713 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 714 tz->temperature, tz->kelvin_offset); 715 if (thermal_get_trip_temp(thermal, trip, &trip_temp)) 716 return -EINVAL; 717 718 if (temp > trip_temp) { 719 *trend = THERMAL_TREND_RAISING; 720 return 0; 721 } else { 722 /* Fall back on default trend */ 723 return -EINVAL; 724 } 725 } 726 727 /* 728 * tz->temperature has already been updated by generic thermal layer, 729 * before this callback being invoked 730 */ 731 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature)) 732 + (tz->trips.passive.tc2 733 * (tz->temperature - tz->trips.passive.temperature)); 734 735 if (i > 0) 736 *trend = THERMAL_TREND_RAISING; 737 else if (i < 0) 738 *trend = THERMAL_TREND_DROPPING; 739 else 740 *trend = THERMAL_TREND_STABLE; 741 return 0; 742 } 743 744 745 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 746 enum thermal_trip_type trip_type) 747 { 748 u8 type = 0; 749 struct acpi_thermal *tz = thermal->devdata; 750 751 if (trip_type == THERMAL_TRIP_CRITICAL) 752 type = ACPI_THERMAL_NOTIFY_CRITICAL; 753 else if (trip_type == THERMAL_TRIP_HOT) 754 type = ACPI_THERMAL_NOTIFY_HOT; 755 else 756 return 0; 757 758 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 759 dev_name(&tz->device->dev), type, 1); 760 761 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 762 return 1; 763 764 return 0; 765 } 766 767 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 768 struct thermal_cooling_device *cdev, 769 bool bind) 770 { 771 struct acpi_device *device = cdev->devdata; 772 struct acpi_thermal *tz = thermal->devdata; 773 struct acpi_device *dev; 774 acpi_status status; 775 acpi_handle handle; 776 int i; 777 int j; 778 int trip = -1; 779 int result = 0; 780 781 if (tz->trips.critical.flags.valid) 782 trip++; 783 784 if (tz->trips.hot.flags.valid) 785 trip++; 786 787 if (tz->trips.passive.flags.valid) { 788 trip++; 789 for (i = 0; i < tz->trips.passive.devices.count; 790 i++) { 791 handle = tz->trips.passive.devices.handles[i]; 792 status = acpi_bus_get_device(handle, &dev); 793 if (ACPI_FAILURE(status) || dev != device) 794 continue; 795 if (bind) 796 result = 797 thermal_zone_bind_cooling_device 798 (thermal, trip, cdev, 799 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 800 THERMAL_WEIGHT_DEFAULT); 801 else 802 result = 803 thermal_zone_unbind_cooling_device 804 (thermal, trip, cdev); 805 if (result) 806 goto failed; 807 } 808 } 809 810 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 811 if (!tz->trips.active[i].flags.valid) 812 break; 813 trip++; 814 for (j = 0; 815 j < tz->trips.active[i].devices.count; 816 j++) { 817 handle = tz->trips.active[i].devices.handles[j]; 818 status = acpi_bus_get_device(handle, &dev); 819 if (ACPI_FAILURE(status) || dev != device) 820 continue; 821 if (bind) 822 result = thermal_zone_bind_cooling_device 823 (thermal, trip, cdev, 824 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 825 THERMAL_WEIGHT_DEFAULT); 826 else 827 result = thermal_zone_unbind_cooling_device 828 (thermal, trip, cdev); 829 if (result) 830 goto failed; 831 } 832 } 833 834 for (i = 0; i < tz->devices.count; i++) { 835 handle = tz->devices.handles[i]; 836 status = acpi_bus_get_device(handle, &dev); 837 if (ACPI_SUCCESS(status) && (dev == device)) { 838 if (bind) 839 result = thermal_zone_bind_cooling_device 840 (thermal, THERMAL_TRIPS_NONE, 841 cdev, THERMAL_NO_LIMIT, 842 THERMAL_NO_LIMIT, 843 THERMAL_WEIGHT_DEFAULT); 844 else 845 result = thermal_zone_unbind_cooling_device 846 (thermal, THERMAL_TRIPS_NONE, 847 cdev); 848 if (result) 849 goto failed; 850 } 851 } 852 853 failed: 854 return result; 855 } 856 857 static int 858 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 859 struct thermal_cooling_device *cdev) 860 { 861 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 862 } 863 864 static int 865 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 866 struct thermal_cooling_device *cdev) 867 { 868 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 869 } 870 871 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 872 .bind = acpi_thermal_bind_cooling_device, 873 .unbind = acpi_thermal_unbind_cooling_device, 874 .get_temp = thermal_get_temp, 875 .get_mode = thermal_get_mode, 876 .set_mode = thermal_set_mode, 877 .get_trip_type = thermal_get_trip_type, 878 .get_trip_temp = thermal_get_trip_temp, 879 .get_crit_temp = thermal_get_crit_temp, 880 .get_trend = thermal_get_trend, 881 .notify = thermal_notify, 882 }; 883 884 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 885 { 886 int trips = 0; 887 int result; 888 acpi_status status; 889 int i; 890 891 if (tz->trips.critical.flags.valid) 892 trips++; 893 894 if (tz->trips.hot.flags.valid) 895 trips++; 896 897 if (tz->trips.passive.flags.valid) 898 trips++; 899 900 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 901 tz->trips.active[i].flags.valid; i++, trips++); 902 903 if (tz->trips.passive.flags.valid) 904 tz->thermal_zone = 905 thermal_zone_device_register("acpitz", trips, 0, tz, 906 &acpi_thermal_zone_ops, NULL, 907 tz->trips.passive.tsp*100, 908 tz->polling_frequency*100); 909 else 910 tz->thermal_zone = 911 thermal_zone_device_register("acpitz", trips, 0, tz, 912 &acpi_thermal_zone_ops, NULL, 913 0, tz->polling_frequency*100); 914 if (IS_ERR(tz->thermal_zone)) 915 return -ENODEV; 916 917 result = sysfs_create_link(&tz->device->dev.kobj, 918 &tz->thermal_zone->device.kobj, "thermal_zone"); 919 if (result) 920 return result; 921 922 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 923 &tz->device->dev.kobj, "device"); 924 if (result) 925 return result; 926 927 status = acpi_bus_attach_private_data(tz->device->handle, 928 tz->thermal_zone); 929 if (ACPI_FAILURE(status)) 930 return -ENODEV; 931 932 tz->tz_enabled = 1; 933 934 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 935 tz->thermal_zone->id); 936 return 0; 937 } 938 939 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 940 { 941 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 942 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 943 thermal_zone_device_unregister(tz->thermal_zone); 944 tz->thermal_zone = NULL; 945 acpi_bus_detach_private_data(tz->device->handle); 946 } 947 948 949 /* -------------------------------------------------------------------------- 950 Driver Interface 951 -------------------------------------------------------------------------- */ 952 953 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 954 { 955 struct acpi_thermal *tz = acpi_driver_data(device); 956 957 958 if (!tz) 959 return; 960 961 switch (event) { 962 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 963 acpi_thermal_check(tz); 964 break; 965 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 966 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 967 acpi_thermal_check(tz); 968 acpi_bus_generate_netlink_event(device->pnp.device_class, 969 dev_name(&device->dev), event, 0); 970 break; 971 case ACPI_THERMAL_NOTIFY_DEVICES: 972 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 973 acpi_thermal_check(tz); 974 acpi_bus_generate_netlink_event(device->pnp.device_class, 975 dev_name(&device->dev), event, 0); 976 break; 977 default: 978 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 979 "Unsupported event [0x%x]\n", event)); 980 break; 981 } 982 } 983 984 /* 985 * On some platforms, the AML code has dependency about 986 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 987 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 988 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 989 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 990 * if _TMP has never been evaluated. 991 * 992 * As this dependency is totally transparent to OS, evaluate 993 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 994 * _TMP, before they are actually used. 995 */ 996 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 997 { 998 acpi_handle handle = tz->device->handle; 999 unsigned long long value; 1000 int i; 1001 1002 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 1003 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 1004 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 1005 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1006 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 1007 acpi_status status; 1008 1009 status = acpi_evaluate_integer(handle, name, NULL, &value); 1010 if (status == AE_NOT_FOUND) 1011 break; 1012 } 1013 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 1014 } 1015 1016 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1017 { 1018 int result = 0; 1019 1020 1021 if (!tz) 1022 return -EINVAL; 1023 1024 acpi_thermal_aml_dependency_fix(tz); 1025 1026 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1027 result = acpi_thermal_get_trip_points(tz); 1028 if (result) 1029 return result; 1030 1031 /* Get temperature [_TMP] (required) */ 1032 result = acpi_thermal_get_temperature(tz); 1033 if (result) 1034 return result; 1035 1036 /* Set the cooling mode [_SCP] to active cooling (default) */ 1037 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1038 if (!result) 1039 tz->flags.cooling_mode = 1; 1040 1041 /* Get default polling frequency [_TZP] (optional) */ 1042 if (tzp) 1043 tz->polling_frequency = tzp; 1044 else 1045 acpi_thermal_get_polling_frequency(tz); 1046 1047 return 0; 1048 } 1049 1050 /* 1051 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1052 * handles temperature values with a single decimal place. As a consequence, 1053 * some implementations use an offset of 273.1 and others use an offset of 1054 * 273.2. Try to find out which one is being used, to present the most 1055 * accurate and visually appealing number. 1056 * 1057 * The heuristic below should work for all ACPI thermal zones which have a 1058 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1059 */ 1060 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1061 { 1062 if (tz->trips.critical.flags.valid && 1063 (tz->trips.critical.temperature % 5) == 1) 1064 tz->kelvin_offset = 2731; 1065 else 1066 tz->kelvin_offset = 2732; 1067 } 1068 1069 static void acpi_thermal_check_fn(struct work_struct *work) 1070 { 1071 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 1072 thermal_check_work); 1073 acpi_thermal_check(tz); 1074 } 1075 1076 static int acpi_thermal_add(struct acpi_device *device) 1077 { 1078 int result = 0; 1079 struct acpi_thermal *tz = NULL; 1080 1081 1082 if (!device) 1083 return -EINVAL; 1084 1085 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1086 if (!tz) 1087 return -ENOMEM; 1088 1089 tz->device = device; 1090 strcpy(tz->name, device->pnp.bus_id); 1091 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1092 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1093 device->driver_data = tz; 1094 1095 result = acpi_thermal_get_info(tz); 1096 if (result) 1097 goto free_memory; 1098 1099 acpi_thermal_guess_offset(tz); 1100 1101 result = acpi_thermal_register_thermal_zone(tz); 1102 if (result) 1103 goto free_memory; 1104 1105 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1106 1107 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device), 1108 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature)); 1109 goto end; 1110 1111 free_memory: 1112 kfree(tz); 1113 end: 1114 return result; 1115 } 1116 1117 static int acpi_thermal_remove(struct acpi_device *device) 1118 { 1119 struct acpi_thermal *tz = NULL; 1120 1121 if (!device || !acpi_driver_data(device)) 1122 return -EINVAL; 1123 1124 flush_workqueue(acpi_thermal_pm_queue); 1125 tz = acpi_driver_data(device); 1126 1127 acpi_thermal_unregister_thermal_zone(tz); 1128 kfree(tz); 1129 return 0; 1130 } 1131 1132 #ifdef CONFIG_PM_SLEEP 1133 static int acpi_thermal_suspend(struct device *dev) 1134 { 1135 /* Make sure the previously queued thermal check work has been done */ 1136 flush_workqueue(acpi_thermal_pm_queue); 1137 return 0; 1138 } 1139 1140 static int acpi_thermal_resume(struct device *dev) 1141 { 1142 struct acpi_thermal *tz; 1143 int i, j, power_state, result; 1144 1145 if (!dev) 1146 return -EINVAL; 1147 1148 tz = acpi_driver_data(to_acpi_device(dev)); 1149 if (!tz) 1150 return -EINVAL; 1151 1152 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1153 if (!(&tz->trips.active[i])) 1154 break; 1155 if (!tz->trips.active[i].flags.valid) 1156 break; 1157 tz->trips.active[i].flags.enabled = 1; 1158 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1159 result = acpi_bus_update_power( 1160 tz->trips.active[i].devices.handles[j], 1161 &power_state); 1162 if (result || (power_state != ACPI_STATE_D0)) { 1163 tz->trips.active[i].flags.enabled = 0; 1164 break; 1165 } 1166 } 1167 tz->state.active |= tz->trips.active[i].flags.enabled; 1168 } 1169 1170 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); 1171 1172 return AE_OK; 1173 } 1174 #endif 1175 1176 static int thermal_act(const struct dmi_system_id *d) { 1177 1178 if (act == 0) { 1179 pr_notice(PREFIX "%s detected: " 1180 "disabling all active thermal trip points\n", d->ident); 1181 act = -1; 1182 } 1183 return 0; 1184 } 1185 static int thermal_nocrt(const struct dmi_system_id *d) { 1186 1187 pr_notice(PREFIX "%s detected: " 1188 "disabling all critical thermal trip point actions.\n", d->ident); 1189 nocrt = 1; 1190 return 0; 1191 } 1192 static int thermal_tzp(const struct dmi_system_id *d) { 1193 1194 if (tzp == 0) { 1195 pr_notice(PREFIX "%s detected: " 1196 "enabling thermal zone polling\n", d->ident); 1197 tzp = 300; /* 300 dS = 30 Seconds */ 1198 } 1199 return 0; 1200 } 1201 static int thermal_psv(const struct dmi_system_id *d) { 1202 1203 if (psv == 0) { 1204 pr_notice(PREFIX "%s detected: " 1205 "disabling all passive thermal trip points\n", d->ident); 1206 psv = -1; 1207 } 1208 return 0; 1209 } 1210 1211 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1212 /* 1213 * Award BIOS on this AOpen makes thermal control almost worthless. 1214 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1215 */ 1216 { 1217 .callback = thermal_act, 1218 .ident = "AOpen i915GMm-HFS", 1219 .matches = { 1220 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1221 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1222 }, 1223 }, 1224 { 1225 .callback = thermal_psv, 1226 .ident = "AOpen i915GMm-HFS", 1227 .matches = { 1228 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1229 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1230 }, 1231 }, 1232 { 1233 .callback = thermal_tzp, 1234 .ident = "AOpen i915GMm-HFS", 1235 .matches = { 1236 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1237 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1238 }, 1239 }, 1240 { 1241 .callback = thermal_nocrt, 1242 .ident = "Gigabyte GA-7ZX", 1243 .matches = { 1244 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1245 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1246 }, 1247 }, 1248 {} 1249 }; 1250 1251 static int __init acpi_thermal_init(void) 1252 { 1253 int result = 0; 1254 1255 dmi_check_system(thermal_dmi_table); 1256 1257 if (off) { 1258 pr_notice(PREFIX "thermal control disabled\n"); 1259 return -ENODEV; 1260 } 1261 1262 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm"); 1263 if (!acpi_thermal_pm_queue) 1264 return -ENODEV; 1265 1266 result = acpi_bus_register_driver(&acpi_thermal_driver); 1267 if (result < 0) { 1268 destroy_workqueue(acpi_thermal_pm_queue); 1269 return -ENODEV; 1270 } 1271 1272 return 0; 1273 } 1274 1275 static void __exit acpi_thermal_exit(void) 1276 { 1277 acpi_bus_unregister_driver(&acpi_thermal_driver); 1278 destroy_workqueue(acpi_thermal_pm_queue); 1279 1280 return; 1281 } 1282 1283 module_init(acpi_thermal_init); 1284 module_exit(acpi_thermal_exit); 1285