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 <linux/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_DECI_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_DECI_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_DECI_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_DECI_KELVIN(act) ? 443 tz->trips.active[i - 2].temperature : 444 CELSIUS_TO_DECI_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 THERMAL_EVENT_UNSPECIFIED); 525 } 526 527 /* sys I/F for generic thermal sysfs support */ 528 529 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) 530 { 531 struct acpi_thermal *tz = thermal->devdata; 532 int result; 533 534 if (!tz) 535 return -EINVAL; 536 537 result = acpi_thermal_get_temperature(tz); 538 if (result) 539 return result; 540 541 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature, 542 tz->kelvin_offset); 543 return 0; 544 } 545 546 static int thermal_get_mode(struct thermal_zone_device *thermal, 547 enum thermal_device_mode *mode) 548 { 549 struct acpi_thermal *tz = thermal->devdata; 550 551 if (!tz) 552 return -EINVAL; 553 554 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 555 THERMAL_DEVICE_DISABLED; 556 557 return 0; 558 } 559 560 static int thermal_set_mode(struct thermal_zone_device *thermal, 561 enum thermal_device_mode mode) 562 { 563 struct acpi_thermal *tz = thermal->devdata; 564 int enable; 565 566 if (!tz) 567 return -EINVAL; 568 569 /* 570 * enable/disable thermal management from ACPI thermal driver 571 */ 572 if (mode == THERMAL_DEVICE_ENABLED) 573 enable = 1; 574 else if (mode == THERMAL_DEVICE_DISABLED) { 575 enable = 0; 576 pr_warn("thermal zone will be disabled\n"); 577 } else 578 return -EINVAL; 579 580 if (enable != tz->tz_enabled) { 581 tz->tz_enabled = enable; 582 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 583 "%s kernel ACPI thermal control\n", 584 tz->tz_enabled ? "Enable" : "Disable")); 585 acpi_thermal_check(tz); 586 } 587 return 0; 588 } 589 590 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 591 int trip, enum thermal_trip_type *type) 592 { 593 struct acpi_thermal *tz = thermal->devdata; 594 int i; 595 596 if (!tz || trip < 0) 597 return -EINVAL; 598 599 if (tz->trips.critical.flags.valid) { 600 if (!trip) { 601 *type = THERMAL_TRIP_CRITICAL; 602 return 0; 603 } 604 trip--; 605 } 606 607 if (tz->trips.hot.flags.valid) { 608 if (!trip) { 609 *type = THERMAL_TRIP_HOT; 610 return 0; 611 } 612 trip--; 613 } 614 615 if (tz->trips.passive.flags.valid) { 616 if (!trip) { 617 *type = THERMAL_TRIP_PASSIVE; 618 return 0; 619 } 620 trip--; 621 } 622 623 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 624 tz->trips.active[i].flags.valid; i++) { 625 if (!trip) { 626 *type = THERMAL_TRIP_ACTIVE; 627 return 0; 628 } 629 trip--; 630 } 631 632 return -EINVAL; 633 } 634 635 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 636 int trip, int *temp) 637 { 638 struct acpi_thermal *tz = thermal->devdata; 639 int i; 640 641 if (!tz || trip < 0) 642 return -EINVAL; 643 644 if (tz->trips.critical.flags.valid) { 645 if (!trip) { 646 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 647 tz->trips.critical.temperature, 648 tz->kelvin_offset); 649 return 0; 650 } 651 trip--; 652 } 653 654 if (tz->trips.hot.flags.valid) { 655 if (!trip) { 656 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 657 tz->trips.hot.temperature, 658 tz->kelvin_offset); 659 return 0; 660 } 661 trip--; 662 } 663 664 if (tz->trips.passive.flags.valid) { 665 if (!trip) { 666 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 667 tz->trips.passive.temperature, 668 tz->kelvin_offset); 669 return 0; 670 } 671 trip--; 672 } 673 674 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 675 tz->trips.active[i].flags.valid; i++) { 676 if (!trip) { 677 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 678 tz->trips.active[i].temperature, 679 tz->kelvin_offset); 680 return 0; 681 } 682 trip--; 683 } 684 685 return -EINVAL; 686 } 687 688 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 689 int *temperature) 690 { 691 struct acpi_thermal *tz = thermal->devdata; 692 693 if (tz->trips.critical.flags.valid) { 694 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 695 tz->trips.critical.temperature, 696 tz->kelvin_offset); 697 return 0; 698 } else 699 return -EINVAL; 700 } 701 702 static int thermal_get_trend(struct thermal_zone_device *thermal, 703 int trip, enum thermal_trend *trend) 704 { 705 struct acpi_thermal *tz = thermal->devdata; 706 enum thermal_trip_type type; 707 int i; 708 709 if (thermal_get_trip_type(thermal, trip, &type)) 710 return -EINVAL; 711 712 if (type == THERMAL_TRIP_ACTIVE) { 713 int trip_temp; 714 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET( 715 tz->temperature, tz->kelvin_offset); 716 if (thermal_get_trip_temp(thermal, trip, &trip_temp)) 717 return -EINVAL; 718 719 if (temp > trip_temp) { 720 *trend = THERMAL_TREND_RAISING; 721 return 0; 722 } else { 723 /* Fall back on default trend */ 724 return -EINVAL; 725 } 726 } 727 728 /* 729 * tz->temperature has already been updated by generic thermal layer, 730 * before this callback being invoked 731 */ 732 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature)) 733 + (tz->trips.passive.tc2 734 * (tz->temperature - tz->trips.passive.temperature)); 735 736 if (i > 0) 737 *trend = THERMAL_TREND_RAISING; 738 else if (i < 0) 739 *trend = THERMAL_TREND_DROPPING; 740 else 741 *trend = THERMAL_TREND_STABLE; 742 return 0; 743 } 744 745 746 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 747 enum thermal_trip_type trip_type) 748 { 749 u8 type = 0; 750 struct acpi_thermal *tz = thermal->devdata; 751 752 if (trip_type == THERMAL_TRIP_CRITICAL) 753 type = ACPI_THERMAL_NOTIFY_CRITICAL; 754 else if (trip_type == THERMAL_TRIP_HOT) 755 type = ACPI_THERMAL_NOTIFY_HOT; 756 else 757 return 0; 758 759 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 760 dev_name(&tz->device->dev), type, 1); 761 762 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 763 return 1; 764 765 return 0; 766 } 767 768 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 769 struct thermal_cooling_device *cdev, 770 bool bind) 771 { 772 struct acpi_device *device = cdev->devdata; 773 struct acpi_thermal *tz = thermal->devdata; 774 struct acpi_device *dev; 775 acpi_status status; 776 acpi_handle handle; 777 int i; 778 int j; 779 int trip = -1; 780 int result = 0; 781 782 if (tz->trips.critical.flags.valid) 783 trip++; 784 785 if (tz->trips.hot.flags.valid) 786 trip++; 787 788 if (tz->trips.passive.flags.valid) { 789 trip++; 790 for (i = 0; i < tz->trips.passive.devices.count; 791 i++) { 792 handle = tz->trips.passive.devices.handles[i]; 793 status = acpi_bus_get_device(handle, &dev); 794 if (ACPI_FAILURE(status) || dev != device) 795 continue; 796 if (bind) 797 result = 798 thermal_zone_bind_cooling_device 799 (thermal, trip, cdev, 800 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 801 THERMAL_WEIGHT_DEFAULT); 802 else 803 result = 804 thermal_zone_unbind_cooling_device 805 (thermal, trip, cdev); 806 if (result) 807 goto failed; 808 } 809 } 810 811 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 812 if (!tz->trips.active[i].flags.valid) 813 break; 814 trip++; 815 for (j = 0; 816 j < tz->trips.active[i].devices.count; 817 j++) { 818 handle = tz->trips.active[i].devices.handles[j]; 819 status = acpi_bus_get_device(handle, &dev); 820 if (ACPI_FAILURE(status) || dev != device) 821 continue; 822 if (bind) 823 result = thermal_zone_bind_cooling_device 824 (thermal, trip, cdev, 825 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, 826 THERMAL_WEIGHT_DEFAULT); 827 else 828 result = thermal_zone_unbind_cooling_device 829 (thermal, trip, cdev); 830 if (result) 831 goto failed; 832 } 833 } 834 835 for (i = 0; i < tz->devices.count; i++) { 836 handle = tz->devices.handles[i]; 837 status = acpi_bus_get_device(handle, &dev); 838 if (ACPI_SUCCESS(status) && (dev == device)) { 839 if (bind) 840 result = thermal_zone_bind_cooling_device 841 (thermal, THERMAL_TRIPS_NONE, 842 cdev, THERMAL_NO_LIMIT, 843 THERMAL_NO_LIMIT, 844 THERMAL_WEIGHT_DEFAULT); 845 else 846 result = thermal_zone_unbind_cooling_device 847 (thermal, THERMAL_TRIPS_NONE, 848 cdev); 849 if (result) 850 goto failed; 851 } 852 } 853 854 failed: 855 return result; 856 } 857 858 static int 859 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 860 struct thermal_cooling_device *cdev) 861 { 862 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 863 } 864 865 static int 866 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 867 struct thermal_cooling_device *cdev) 868 { 869 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 870 } 871 872 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 873 .bind = acpi_thermal_bind_cooling_device, 874 .unbind = acpi_thermal_unbind_cooling_device, 875 .get_temp = thermal_get_temp, 876 .get_mode = thermal_get_mode, 877 .set_mode = thermal_set_mode, 878 .get_trip_type = thermal_get_trip_type, 879 .get_trip_temp = thermal_get_trip_temp, 880 .get_crit_temp = thermal_get_crit_temp, 881 .get_trend = thermal_get_trend, 882 .notify = thermal_notify, 883 }; 884 885 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 886 { 887 int trips = 0; 888 int result; 889 acpi_status status; 890 int i; 891 892 if (tz->trips.critical.flags.valid) 893 trips++; 894 895 if (tz->trips.hot.flags.valid) 896 trips++; 897 898 if (tz->trips.passive.flags.valid) 899 trips++; 900 901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 902 tz->trips.active[i].flags.valid; i++, trips++); 903 904 if (tz->trips.passive.flags.valid) 905 tz->thermal_zone = 906 thermal_zone_device_register("acpitz", trips, 0, tz, 907 &acpi_thermal_zone_ops, NULL, 908 tz->trips.passive.tsp*100, 909 tz->polling_frequency*100); 910 else 911 tz->thermal_zone = 912 thermal_zone_device_register("acpitz", trips, 0, tz, 913 &acpi_thermal_zone_ops, NULL, 914 0, tz->polling_frequency*100); 915 if (IS_ERR(tz->thermal_zone)) 916 return -ENODEV; 917 918 result = sysfs_create_link(&tz->device->dev.kobj, 919 &tz->thermal_zone->device.kobj, "thermal_zone"); 920 if (result) 921 return result; 922 923 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 924 &tz->device->dev.kobj, "device"); 925 if (result) 926 return result; 927 928 status = acpi_bus_attach_private_data(tz->device->handle, 929 tz->thermal_zone); 930 if (ACPI_FAILURE(status)) 931 return -ENODEV; 932 933 tz->tz_enabled = 1; 934 935 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 936 tz->thermal_zone->id); 937 return 0; 938 } 939 940 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 941 { 942 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 943 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 944 thermal_zone_device_unregister(tz->thermal_zone); 945 tz->thermal_zone = NULL; 946 acpi_bus_detach_private_data(tz->device->handle); 947 } 948 949 950 /* -------------------------------------------------------------------------- 951 Driver Interface 952 -------------------------------------------------------------------------- */ 953 954 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 955 { 956 struct acpi_thermal *tz = acpi_driver_data(device); 957 958 959 if (!tz) 960 return; 961 962 switch (event) { 963 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 964 acpi_thermal_check(tz); 965 break; 966 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 967 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 968 acpi_thermal_check(tz); 969 acpi_bus_generate_netlink_event(device->pnp.device_class, 970 dev_name(&device->dev), event, 0); 971 break; 972 case ACPI_THERMAL_NOTIFY_DEVICES: 973 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 974 acpi_thermal_check(tz); 975 acpi_bus_generate_netlink_event(device->pnp.device_class, 976 dev_name(&device->dev), event, 0); 977 break; 978 default: 979 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 980 "Unsupported event [0x%x]\n", event)); 981 break; 982 } 983 } 984 985 /* 986 * On some platforms, the AML code has dependency about 987 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 988 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 989 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 990 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 991 * if _TMP has never been evaluated. 992 * 993 * As this dependency is totally transparent to OS, evaluate 994 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 995 * _TMP, before they are actually used. 996 */ 997 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 998 { 999 acpi_handle handle = tz->device->handle; 1000 unsigned long long value; 1001 int i; 1002 1003 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 1004 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 1005 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 1006 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1007 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 1008 acpi_status status; 1009 1010 status = acpi_evaluate_integer(handle, name, NULL, &value); 1011 if (status == AE_NOT_FOUND) 1012 break; 1013 } 1014 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 1015 } 1016 1017 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1018 { 1019 int result = 0; 1020 1021 1022 if (!tz) 1023 return -EINVAL; 1024 1025 acpi_thermal_aml_dependency_fix(tz); 1026 1027 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1028 result = acpi_thermal_get_trip_points(tz); 1029 if (result) 1030 return result; 1031 1032 /* Get temperature [_TMP] (required) */ 1033 result = acpi_thermal_get_temperature(tz); 1034 if (result) 1035 return result; 1036 1037 /* Set the cooling mode [_SCP] to active cooling (default) */ 1038 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1039 if (!result) 1040 tz->flags.cooling_mode = 1; 1041 1042 /* Get default polling frequency [_TZP] (optional) */ 1043 if (tzp) 1044 tz->polling_frequency = tzp; 1045 else 1046 acpi_thermal_get_polling_frequency(tz); 1047 1048 return 0; 1049 } 1050 1051 /* 1052 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1053 * handles temperature values with a single decimal place. As a consequence, 1054 * some implementations use an offset of 273.1 and others use an offset of 1055 * 273.2. Try to find out which one is being used, to present the most 1056 * accurate and visually appealing number. 1057 * 1058 * The heuristic below should work for all ACPI thermal zones which have a 1059 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1060 */ 1061 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1062 { 1063 if (tz->trips.critical.flags.valid && 1064 (tz->trips.critical.temperature % 5) == 1) 1065 tz->kelvin_offset = 2731; 1066 else 1067 tz->kelvin_offset = 2732; 1068 } 1069 1070 static void acpi_thermal_check_fn(struct work_struct *work) 1071 { 1072 struct acpi_thermal *tz = container_of(work, struct acpi_thermal, 1073 thermal_check_work); 1074 acpi_thermal_check(tz); 1075 } 1076 1077 static int acpi_thermal_add(struct acpi_device *device) 1078 { 1079 int result = 0; 1080 struct acpi_thermal *tz = NULL; 1081 1082 1083 if (!device) 1084 return -EINVAL; 1085 1086 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1087 if (!tz) 1088 return -ENOMEM; 1089 1090 tz->device = device; 1091 strcpy(tz->name, device->pnp.bus_id); 1092 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1093 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1094 device->driver_data = tz; 1095 1096 result = acpi_thermal_get_info(tz); 1097 if (result) 1098 goto free_memory; 1099 1100 acpi_thermal_guess_offset(tz); 1101 1102 result = acpi_thermal_register_thermal_zone(tz); 1103 if (result) 1104 goto free_memory; 1105 1106 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); 1107 1108 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device), 1109 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature)); 1110 goto end; 1111 1112 free_memory: 1113 kfree(tz); 1114 end: 1115 return result; 1116 } 1117 1118 static int acpi_thermal_remove(struct acpi_device *device) 1119 { 1120 struct acpi_thermal *tz = NULL; 1121 1122 if (!device || !acpi_driver_data(device)) 1123 return -EINVAL; 1124 1125 flush_workqueue(acpi_thermal_pm_queue); 1126 tz = acpi_driver_data(device); 1127 1128 acpi_thermal_unregister_thermal_zone(tz); 1129 kfree(tz); 1130 return 0; 1131 } 1132 1133 #ifdef CONFIG_PM_SLEEP 1134 static int acpi_thermal_suspend(struct device *dev) 1135 { 1136 /* Make sure the previously queued thermal check work has been done */ 1137 flush_workqueue(acpi_thermal_pm_queue); 1138 return 0; 1139 } 1140 1141 static int acpi_thermal_resume(struct device *dev) 1142 { 1143 struct acpi_thermal *tz; 1144 int i, j, power_state, result; 1145 1146 if (!dev) 1147 return -EINVAL; 1148 1149 tz = acpi_driver_data(to_acpi_device(dev)); 1150 if (!tz) 1151 return -EINVAL; 1152 1153 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1154 if (!(&tz->trips.active[i])) 1155 break; 1156 if (!tz->trips.active[i].flags.valid) 1157 break; 1158 tz->trips.active[i].flags.enabled = 1; 1159 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1160 result = acpi_bus_update_power( 1161 tz->trips.active[i].devices.handles[j], 1162 &power_state); 1163 if (result || (power_state != ACPI_STATE_D0)) { 1164 tz->trips.active[i].flags.enabled = 0; 1165 break; 1166 } 1167 } 1168 tz->state.active |= tz->trips.active[i].flags.enabled; 1169 } 1170 1171 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); 1172 1173 return AE_OK; 1174 } 1175 #endif 1176 1177 static int thermal_act(const struct dmi_system_id *d) { 1178 1179 if (act == 0) { 1180 pr_notice(PREFIX "%s detected: " 1181 "disabling all active thermal trip points\n", d->ident); 1182 act = -1; 1183 } 1184 return 0; 1185 } 1186 static int thermal_nocrt(const struct dmi_system_id *d) { 1187 1188 pr_notice(PREFIX "%s detected: " 1189 "disabling all critical thermal trip point actions.\n", d->ident); 1190 nocrt = 1; 1191 return 0; 1192 } 1193 static int thermal_tzp(const struct dmi_system_id *d) { 1194 1195 if (tzp == 0) { 1196 pr_notice(PREFIX "%s detected: " 1197 "enabling thermal zone polling\n", d->ident); 1198 tzp = 300; /* 300 dS = 30 Seconds */ 1199 } 1200 return 0; 1201 } 1202 static int thermal_psv(const struct dmi_system_id *d) { 1203 1204 if (psv == 0) { 1205 pr_notice(PREFIX "%s detected: " 1206 "disabling all passive thermal trip points\n", d->ident); 1207 psv = -1; 1208 } 1209 return 0; 1210 } 1211 1212 static const struct dmi_system_id thermal_dmi_table[] __initconst = { 1213 /* 1214 * Award BIOS on this AOpen makes thermal control almost worthless. 1215 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1216 */ 1217 { 1218 .callback = thermal_act, 1219 .ident = "AOpen i915GMm-HFS", 1220 .matches = { 1221 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1222 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1223 }, 1224 }, 1225 { 1226 .callback = thermal_psv, 1227 .ident = "AOpen i915GMm-HFS", 1228 .matches = { 1229 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1230 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1231 }, 1232 }, 1233 { 1234 .callback = thermal_tzp, 1235 .ident = "AOpen i915GMm-HFS", 1236 .matches = { 1237 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1238 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1239 }, 1240 }, 1241 { 1242 .callback = thermal_nocrt, 1243 .ident = "Gigabyte GA-7ZX", 1244 .matches = { 1245 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1246 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1247 }, 1248 }, 1249 {} 1250 }; 1251 1252 static int __init acpi_thermal_init(void) 1253 { 1254 int result = 0; 1255 1256 dmi_check_system(thermal_dmi_table); 1257 1258 if (off) { 1259 pr_notice(PREFIX "thermal control disabled\n"); 1260 return -ENODEV; 1261 } 1262 1263 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", 1264 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); 1265 if (!acpi_thermal_pm_queue) 1266 return -ENODEV; 1267 1268 result = acpi_bus_register_driver(&acpi_thermal_driver); 1269 if (result < 0) { 1270 destroy_workqueue(acpi_thermal_pm_queue); 1271 return -ENODEV; 1272 } 1273 1274 return 0; 1275 } 1276 1277 static void __exit acpi_thermal_exit(void) 1278 { 1279 acpi_bus_unregister_driver(&acpi_thermal_driver); 1280 destroy_workqueue(acpi_thermal_pm_queue); 1281 1282 return; 1283 } 1284 1285 module_init(acpi_thermal_init); 1286 module_exit(acpi_thermal_exit); 1287