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 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 * 25 * This driver fully implements the ACPI thermal policy as described in the 26 * ACPI 2.0 Specification. 27 * 28 * TBD: 1. Implement passive cooling hysteresis. 29 * 2. Enhance passive cooling (CPU) states/limit interface to support 30 * concepts of 'multiple limiters', upper/lower limits, etc. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/dmi.h> 37 #include <linux/init.h> 38 #include <linux/slab.h> 39 #include <linux/types.h> 40 #include <linux/jiffies.h> 41 #include <linux/kmod.h> 42 #include <linux/reboot.h> 43 #include <linux/device.h> 44 #include <linux/thermal.h> 45 #include <linux/acpi.h> 46 #include <asm/uaccess.h> 47 48 #define PREFIX "ACPI: " 49 50 #define ACPI_THERMAL_CLASS "thermal_zone" 51 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 52 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 53 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 54 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 55 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 56 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 57 #define ACPI_THERMAL_MODE_ACTIVE 0x00 58 59 #define ACPI_THERMAL_MAX_ACTIVE 10 60 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 61 62 #define _COMPONENT ACPI_THERMAL_COMPONENT 63 ACPI_MODULE_NAME("thermal"); 64 65 MODULE_AUTHOR("Paul Diefenbaugh"); 66 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 67 MODULE_LICENSE("GPL"); 68 69 static int act; 70 module_param(act, int, 0644); 71 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 72 73 static int crt; 74 module_param(crt, int, 0644); 75 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 76 77 static int tzp; 78 module_param(tzp, int, 0444); 79 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 80 81 static int nocrt; 82 module_param(nocrt, int, 0); 83 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 84 85 static int off; 86 module_param(off, int, 0); 87 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 88 89 static int psv; 90 module_param(psv, int, 0644); 91 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 92 93 static int acpi_thermal_add(struct acpi_device *device); 94 static int acpi_thermal_remove(struct acpi_device *device); 95 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 96 97 static const struct acpi_device_id thermal_device_ids[] = { 98 {ACPI_THERMAL_HID, 0}, 99 {"", 0}, 100 }; 101 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 102 103 #ifdef CONFIG_PM_SLEEP 104 static int acpi_thermal_resume(struct device *dev); 105 #else 106 #define acpi_thermal_resume NULL 107 #endif 108 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume); 109 110 static struct acpi_driver acpi_thermal_driver = { 111 .name = "thermal", 112 .class = ACPI_THERMAL_CLASS, 113 .ids = thermal_device_ids, 114 .ops = { 115 .add = acpi_thermal_add, 116 .remove = acpi_thermal_remove, 117 .notify = acpi_thermal_notify, 118 }, 119 .drv.pm = &acpi_thermal_pm, 120 }; 121 122 struct acpi_thermal_state { 123 u8 critical:1; 124 u8 hot:1; 125 u8 passive:1; 126 u8 active:1; 127 u8 reserved:4; 128 int active_index; 129 }; 130 131 struct acpi_thermal_state_flags { 132 u8 valid:1; 133 u8 enabled:1; 134 u8 reserved:6; 135 }; 136 137 struct acpi_thermal_critical { 138 struct acpi_thermal_state_flags flags; 139 unsigned long temperature; 140 }; 141 142 struct acpi_thermal_hot { 143 struct acpi_thermal_state_flags flags; 144 unsigned long temperature; 145 }; 146 147 struct acpi_thermal_passive { 148 struct acpi_thermal_state_flags flags; 149 unsigned long temperature; 150 unsigned long tc1; 151 unsigned long tc2; 152 unsigned long tsp; 153 struct acpi_handle_list devices; 154 }; 155 156 struct acpi_thermal_active { 157 struct acpi_thermal_state_flags flags; 158 unsigned long temperature; 159 struct acpi_handle_list devices; 160 }; 161 162 struct acpi_thermal_trips { 163 struct acpi_thermal_critical critical; 164 struct acpi_thermal_hot hot; 165 struct acpi_thermal_passive passive; 166 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 167 }; 168 169 struct acpi_thermal_flags { 170 u8 cooling_mode:1; /* _SCP */ 171 u8 devices:1; /* _TZD */ 172 u8 reserved:6; 173 }; 174 175 struct acpi_thermal { 176 struct acpi_device * device; 177 acpi_bus_id name; 178 unsigned long temperature; 179 unsigned long last_temperature; 180 unsigned long polling_frequency; 181 volatile u8 zombie; 182 struct acpi_thermal_flags flags; 183 struct acpi_thermal_state state; 184 struct acpi_thermal_trips trips; 185 struct acpi_handle_list devices; 186 struct thermal_zone_device *thermal_zone; 187 int tz_enabled; 188 int kelvin_offset; 189 }; 190 191 /* -------------------------------------------------------------------------- 192 Thermal Zone Management 193 -------------------------------------------------------------------------- */ 194 195 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 196 { 197 acpi_status status = AE_OK; 198 unsigned long long tmp; 199 200 if (!tz) 201 return -EINVAL; 202 203 tz->last_temperature = tz->temperature; 204 205 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 206 if (ACPI_FAILURE(status)) 207 return -ENODEV; 208 209 tz->temperature = tmp; 210 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 211 tz->temperature)); 212 213 return 0; 214 } 215 216 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 217 { 218 acpi_status status = AE_OK; 219 unsigned long long tmp; 220 221 if (!tz) 222 return -EINVAL; 223 224 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 225 if (ACPI_FAILURE(status)) 226 return -ENODEV; 227 228 tz->polling_frequency = tmp; 229 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 230 tz->polling_frequency)); 231 232 return 0; 233 } 234 235 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 236 { 237 if (!tz) 238 return -EINVAL; 239 240 if (!acpi_has_method(tz->device->handle, "_SCP")) { 241 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 242 return -ENODEV; 243 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle, 244 "_SCP", mode))) { 245 return -ENODEV; 246 } 247 248 return 0; 249 } 250 251 #define ACPI_TRIPS_CRITICAL 0x01 252 #define ACPI_TRIPS_HOT 0x02 253 #define ACPI_TRIPS_PASSIVE 0x04 254 #define ACPI_TRIPS_ACTIVE 0x08 255 #define ACPI_TRIPS_DEVICES 0x10 256 257 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 258 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 259 260 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 261 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 262 ACPI_TRIPS_DEVICES) 263 264 /* 265 * This exception is thrown out in two cases: 266 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 267 * when re-evaluating the AML code. 268 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 269 * We need to re-bind the cooling devices of a thermal zone when this occurs. 270 */ 271 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 272 do { \ 273 if (flags != ACPI_TRIPS_INIT) \ 274 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 275 "ACPI thermal trip point %s changed\n" \ 276 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \ 277 } while (0) 278 279 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 280 { 281 acpi_status status = AE_OK; 282 unsigned long long tmp; 283 struct acpi_handle_list devices; 284 int valid = 0; 285 int i; 286 287 /* Critical Shutdown */ 288 if (flag & ACPI_TRIPS_CRITICAL) { 289 status = acpi_evaluate_integer(tz->device->handle, 290 "_CRT", NULL, &tmp); 291 tz->trips.critical.temperature = tmp; 292 /* 293 * Treat freezing temperatures as invalid as well; some 294 * BIOSes return really low values and cause reboots at startup. 295 * Below zero (Celsius) values clearly aren't right for sure.. 296 * ... so lets discard those as invalid. 297 */ 298 if (ACPI_FAILURE(status)) { 299 tz->trips.critical.flags.valid = 0; 300 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 301 "No critical threshold\n")); 302 } else if (tmp <= 2732) { 303 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n", 304 tmp); 305 tz->trips.critical.flags.valid = 0; 306 } else { 307 tz->trips.critical.flags.valid = 1; 308 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 309 "Found critical threshold [%lu]\n", 310 tz->trips.critical.temperature)); 311 } 312 if (tz->trips.critical.flags.valid == 1) { 313 if (crt == -1) { 314 tz->trips.critical.flags.valid = 0; 315 } else if (crt > 0) { 316 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 317 /* 318 * Allow override critical threshold 319 */ 320 if (crt_k > tz->trips.critical.temperature) 321 pr_warn(PREFIX "Critical threshold %d C\n", 322 crt); 323 tz->trips.critical.temperature = crt_k; 324 } 325 } 326 } 327 328 /* Critical Sleep (optional) */ 329 if (flag & ACPI_TRIPS_HOT) { 330 status = acpi_evaluate_integer(tz->device->handle, 331 "_HOT", NULL, &tmp); 332 if (ACPI_FAILURE(status)) { 333 tz->trips.hot.flags.valid = 0; 334 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 335 "No hot threshold\n")); 336 } else { 337 tz->trips.hot.temperature = tmp; 338 tz->trips.hot.flags.valid = 1; 339 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 340 "Found hot threshold [%lu]\n", 341 tz->trips.critical.temperature)); 342 } 343 } 344 345 /* Passive (optional) */ 346 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 347 (flag == ACPI_TRIPS_INIT)) { 348 valid = tz->trips.passive.flags.valid; 349 if (psv == -1) { 350 status = AE_SUPPORT; 351 } else if (psv > 0) { 352 tmp = CELSIUS_TO_KELVIN(psv); 353 status = AE_OK; 354 } else { 355 status = acpi_evaluate_integer(tz->device->handle, 356 "_PSV", NULL, &tmp); 357 } 358 359 if (ACPI_FAILURE(status)) 360 tz->trips.passive.flags.valid = 0; 361 else { 362 tz->trips.passive.temperature = tmp; 363 tz->trips.passive.flags.valid = 1; 364 if (flag == ACPI_TRIPS_INIT) { 365 status = acpi_evaluate_integer( 366 tz->device->handle, "_TC1", 367 NULL, &tmp); 368 if (ACPI_FAILURE(status)) 369 tz->trips.passive.flags.valid = 0; 370 else 371 tz->trips.passive.tc1 = tmp; 372 status = acpi_evaluate_integer( 373 tz->device->handle, "_TC2", 374 NULL, &tmp); 375 if (ACPI_FAILURE(status)) 376 tz->trips.passive.flags.valid = 0; 377 else 378 tz->trips.passive.tc2 = tmp; 379 status = acpi_evaluate_integer( 380 tz->device->handle, "_TSP", 381 NULL, &tmp); 382 if (ACPI_FAILURE(status)) 383 tz->trips.passive.flags.valid = 0; 384 else 385 tz->trips.passive.tsp = tmp; 386 } 387 } 388 } 389 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 390 memset(&devices, 0, sizeof(struct acpi_handle_list)); 391 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 392 NULL, &devices); 393 if (ACPI_FAILURE(status)) { 394 pr_warn(PREFIX "Invalid passive threshold\n"); 395 tz->trips.passive.flags.valid = 0; 396 } 397 else 398 tz->trips.passive.flags.valid = 1; 399 400 if (memcmp(&tz->trips.passive.devices, &devices, 401 sizeof(struct acpi_handle_list))) { 402 memcpy(&tz->trips.passive.devices, &devices, 403 sizeof(struct acpi_handle_list)); 404 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 405 } 406 } 407 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 408 if (valid != tz->trips.passive.flags.valid) 409 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 410 } 411 412 /* Active (optional) */ 413 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 414 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 415 valid = tz->trips.active[i].flags.valid; 416 417 if (act == -1) 418 break; /* disable all active trip points */ 419 420 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 421 tz->trips.active[i].flags.valid)) { 422 status = acpi_evaluate_integer(tz->device->handle, 423 name, NULL, &tmp); 424 if (ACPI_FAILURE(status)) { 425 tz->trips.active[i].flags.valid = 0; 426 if (i == 0) 427 break; 428 if (act <= 0) 429 break; 430 if (i == 1) 431 tz->trips.active[0].temperature = 432 CELSIUS_TO_KELVIN(act); 433 else 434 /* 435 * Don't allow override higher than 436 * the next higher trip point 437 */ 438 tz->trips.active[i - 1].temperature = 439 (tz->trips.active[i - 2].temperature < 440 CELSIUS_TO_KELVIN(act) ? 441 tz->trips.active[i - 2].temperature : 442 CELSIUS_TO_KELVIN(act)); 443 break; 444 } else { 445 tz->trips.active[i].temperature = tmp; 446 tz->trips.active[i].flags.valid = 1; 447 } 448 } 449 450 name[2] = 'L'; 451 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 452 memset(&devices, 0, sizeof(struct acpi_handle_list)); 453 status = acpi_evaluate_reference(tz->device->handle, 454 name, NULL, &devices); 455 if (ACPI_FAILURE(status)) { 456 pr_warn(PREFIX "Invalid active%d threshold\n", 457 i); 458 tz->trips.active[i].flags.valid = 0; 459 } 460 else 461 tz->trips.active[i].flags.valid = 1; 462 463 if (memcmp(&tz->trips.active[i].devices, &devices, 464 sizeof(struct acpi_handle_list))) { 465 memcpy(&tz->trips.active[i].devices, &devices, 466 sizeof(struct acpi_handle_list)); 467 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 468 } 469 } 470 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 471 if (valid != tz->trips.active[i].flags.valid) 472 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 473 474 if (!tz->trips.active[i].flags.valid) 475 break; 476 } 477 478 if ((flag & ACPI_TRIPS_DEVICES) 479 && acpi_has_method(tz->device->handle, "_TZD")) { 480 memset(&devices, 0, sizeof(devices)); 481 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 482 NULL, &devices); 483 if (ACPI_SUCCESS(status) 484 && memcmp(&tz->devices, &devices, sizeof(devices))) { 485 tz->devices = devices; 486 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 487 } 488 } 489 490 return 0; 491 } 492 493 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 494 { 495 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 496 497 if (ret) 498 return ret; 499 500 valid = tz->trips.critical.flags.valid | 501 tz->trips.hot.flags.valid | 502 tz->trips.passive.flags.valid; 503 504 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 505 valid |= tz->trips.active[i].flags.valid; 506 507 if (!valid) { 508 pr_warn(FW_BUG "No valid trip found\n"); 509 return -ENODEV; 510 } 511 return 0; 512 } 513 514 static void acpi_thermal_check(void *data) 515 { 516 struct acpi_thermal *tz = data; 517 518 if (!tz->tz_enabled) 519 return; 520 521 thermal_zone_device_update(tz->thermal_zone); 522 } 523 524 /* sys I/F for generic thermal sysfs support */ 525 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 526 527 static int thermal_get_temp(struct thermal_zone_device *thermal, 528 unsigned long *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 = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 541 return 0; 542 } 543 544 static int thermal_get_mode(struct thermal_zone_device *thermal, 545 enum thermal_device_mode *mode) 546 { 547 struct acpi_thermal *tz = thermal->devdata; 548 549 if (!tz) 550 return -EINVAL; 551 552 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 553 THERMAL_DEVICE_DISABLED; 554 555 return 0; 556 } 557 558 static int thermal_set_mode(struct thermal_zone_device *thermal, 559 enum thermal_device_mode mode) 560 { 561 struct acpi_thermal *tz = thermal->devdata; 562 int enable; 563 564 if (!tz) 565 return -EINVAL; 566 567 /* 568 * enable/disable thermal management from ACPI thermal driver 569 */ 570 if (mode == THERMAL_DEVICE_ENABLED) 571 enable = 1; 572 else if (mode == THERMAL_DEVICE_DISABLED) { 573 enable = 0; 574 pr_warn("thermal zone will be disabled\n"); 575 } else 576 return -EINVAL; 577 578 if (enable != tz->tz_enabled) { 579 tz->tz_enabled = enable; 580 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 581 "%s kernel ACPI thermal control\n", 582 tz->tz_enabled ? "Enable" : "Disable")); 583 acpi_thermal_check(tz); 584 } 585 return 0; 586 } 587 588 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 589 int trip, enum thermal_trip_type *type) 590 { 591 struct acpi_thermal *tz = thermal->devdata; 592 int i; 593 594 if (!tz || trip < 0) 595 return -EINVAL; 596 597 if (tz->trips.critical.flags.valid) { 598 if (!trip) { 599 *type = THERMAL_TRIP_CRITICAL; 600 return 0; 601 } 602 trip--; 603 } 604 605 if (tz->trips.hot.flags.valid) { 606 if (!trip) { 607 *type = THERMAL_TRIP_HOT; 608 return 0; 609 } 610 trip--; 611 } 612 613 if (tz->trips.passive.flags.valid) { 614 if (!trip) { 615 *type = THERMAL_TRIP_PASSIVE; 616 return 0; 617 } 618 trip--; 619 } 620 621 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 622 tz->trips.active[i].flags.valid; i++) { 623 if (!trip) { 624 *type = THERMAL_TRIP_ACTIVE; 625 return 0; 626 } 627 trip--; 628 } 629 630 return -EINVAL; 631 } 632 633 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 634 int trip, unsigned long *temp) 635 { 636 struct acpi_thermal *tz = thermal->devdata; 637 int i; 638 639 if (!tz || trip < 0) 640 return -EINVAL; 641 642 if (tz->trips.critical.flags.valid) { 643 if (!trip) { 644 *temp = KELVIN_TO_MILLICELSIUS( 645 tz->trips.critical.temperature, 646 tz->kelvin_offset); 647 return 0; 648 } 649 trip--; 650 } 651 652 if (tz->trips.hot.flags.valid) { 653 if (!trip) { 654 *temp = KELVIN_TO_MILLICELSIUS( 655 tz->trips.hot.temperature, 656 tz->kelvin_offset); 657 return 0; 658 } 659 trip--; 660 } 661 662 if (tz->trips.passive.flags.valid) { 663 if (!trip) { 664 *temp = KELVIN_TO_MILLICELSIUS( 665 tz->trips.passive.temperature, 666 tz->kelvin_offset); 667 return 0; 668 } 669 trip--; 670 } 671 672 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 673 tz->trips.active[i].flags.valid; i++) { 674 if (!trip) { 675 *temp = KELVIN_TO_MILLICELSIUS( 676 tz->trips.active[i].temperature, 677 tz->kelvin_offset); 678 return 0; 679 } 680 trip--; 681 } 682 683 return -EINVAL; 684 } 685 686 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 687 unsigned long *temperature) { 688 struct acpi_thermal *tz = thermal->devdata; 689 690 if (tz->trips.critical.flags.valid) { 691 *temperature = KELVIN_TO_MILLICELSIUS( 692 tz->trips.critical.temperature, 693 tz->kelvin_offset); 694 return 0; 695 } else 696 return -EINVAL; 697 } 698 699 static int thermal_get_trend(struct thermal_zone_device *thermal, 700 int trip, enum thermal_trend *trend) 701 { 702 struct acpi_thermal *tz = thermal->devdata; 703 enum thermal_trip_type type; 704 int i; 705 706 if (thermal_get_trip_type(thermal, trip, &type)) 707 return -EINVAL; 708 709 if (type == THERMAL_TRIP_ACTIVE) { 710 unsigned long trip_temp; 711 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature, 712 tz->kelvin_offset); 713 if (thermal_get_trip_temp(thermal, trip, &trip_temp)) 714 return -EINVAL; 715 716 if (temp > trip_temp) { 717 *trend = THERMAL_TREND_RAISING; 718 return 0; 719 } else { 720 /* Fall back on default trend */ 721 return -EINVAL; 722 } 723 } 724 725 /* 726 * tz->temperature has already been updated by generic thermal layer, 727 * before this callback being invoked 728 */ 729 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature)) 730 + (tz->trips.passive.tc2 731 * (tz->temperature - tz->trips.passive.temperature)); 732 733 if (i > 0) 734 *trend = THERMAL_TREND_RAISING; 735 else if (i < 0) 736 *trend = THERMAL_TREND_DROPPING; 737 else 738 *trend = THERMAL_TREND_STABLE; 739 return 0; 740 } 741 742 743 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 744 enum thermal_trip_type trip_type) 745 { 746 u8 type = 0; 747 struct acpi_thermal *tz = thermal->devdata; 748 749 if (trip_type == THERMAL_TRIP_CRITICAL) 750 type = ACPI_THERMAL_NOTIFY_CRITICAL; 751 else if (trip_type == THERMAL_TRIP_HOT) 752 type = ACPI_THERMAL_NOTIFY_HOT; 753 else 754 return 0; 755 756 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 757 dev_name(&tz->device->dev), type, 1); 758 759 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 760 return 1; 761 762 return 0; 763 } 764 765 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 766 struct thermal_cooling_device *cdev, 767 bool bind) 768 { 769 struct acpi_device *device = cdev->devdata; 770 struct acpi_thermal *tz = thermal->devdata; 771 struct acpi_device *dev; 772 acpi_status status; 773 acpi_handle handle; 774 int i; 775 int j; 776 int trip = -1; 777 int result = 0; 778 779 if (tz->trips.critical.flags.valid) 780 trip++; 781 782 if (tz->trips.hot.flags.valid) 783 trip++; 784 785 if (tz->trips.passive.flags.valid) { 786 trip++; 787 for (i = 0; i < tz->trips.passive.devices.count; 788 i++) { 789 handle = tz->trips.passive.devices.handles[i]; 790 status = acpi_bus_get_device(handle, &dev); 791 if (ACPI_FAILURE(status) || dev != device) 792 continue; 793 if (bind) 794 result = 795 thermal_zone_bind_cooling_device 796 (thermal, trip, cdev, 797 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT); 798 else 799 result = 800 thermal_zone_unbind_cooling_device 801 (thermal, trip, cdev); 802 if (result) 803 goto failed; 804 } 805 } 806 807 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 808 if (!tz->trips.active[i].flags.valid) 809 break; 810 trip++; 811 for (j = 0; 812 j < tz->trips.active[i].devices.count; 813 j++) { 814 handle = tz->trips.active[i].devices.handles[j]; 815 status = acpi_bus_get_device(handle, &dev); 816 if (ACPI_FAILURE(status) || dev != device) 817 continue; 818 if (bind) 819 result = thermal_zone_bind_cooling_device 820 (thermal, trip, cdev, 821 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT); 822 else 823 result = thermal_zone_unbind_cooling_device 824 (thermal, trip, cdev); 825 if (result) 826 goto failed; 827 } 828 } 829 830 for (i = 0; i < tz->devices.count; i++) { 831 handle = tz->devices.handles[i]; 832 status = acpi_bus_get_device(handle, &dev); 833 if (ACPI_SUCCESS(status) && (dev == device)) { 834 if (bind) 835 result = thermal_zone_bind_cooling_device 836 (thermal, THERMAL_TRIPS_NONE, 837 cdev, THERMAL_NO_LIMIT, 838 THERMAL_NO_LIMIT); 839 else 840 result = thermal_zone_unbind_cooling_device 841 (thermal, THERMAL_TRIPS_NONE, 842 cdev); 843 if (result) 844 goto failed; 845 } 846 } 847 848 failed: 849 return result; 850 } 851 852 static int 853 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 854 struct thermal_cooling_device *cdev) 855 { 856 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 857 } 858 859 static int 860 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 861 struct thermal_cooling_device *cdev) 862 { 863 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 864 } 865 866 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 867 .bind = acpi_thermal_bind_cooling_device, 868 .unbind = acpi_thermal_unbind_cooling_device, 869 .get_temp = thermal_get_temp, 870 .get_mode = thermal_get_mode, 871 .set_mode = thermal_set_mode, 872 .get_trip_type = thermal_get_trip_type, 873 .get_trip_temp = thermal_get_trip_temp, 874 .get_crit_temp = thermal_get_crit_temp, 875 .get_trend = thermal_get_trend, 876 .notify = thermal_notify, 877 }; 878 879 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 880 { 881 int trips = 0; 882 int result; 883 acpi_status status; 884 int i; 885 886 if (tz->trips.critical.flags.valid) 887 trips++; 888 889 if (tz->trips.hot.flags.valid) 890 trips++; 891 892 if (tz->trips.passive.flags.valid) 893 trips++; 894 895 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 896 tz->trips.active[i].flags.valid; i++, trips++); 897 898 if (tz->trips.passive.flags.valid) 899 tz->thermal_zone = 900 thermal_zone_device_register("acpitz", trips, 0, tz, 901 &acpi_thermal_zone_ops, NULL, 902 tz->trips.passive.tsp*100, 903 tz->polling_frequency*100); 904 else 905 tz->thermal_zone = 906 thermal_zone_device_register("acpitz", trips, 0, tz, 907 &acpi_thermal_zone_ops, NULL, 908 0, tz->polling_frequency*100); 909 if (IS_ERR(tz->thermal_zone)) 910 return -ENODEV; 911 912 result = sysfs_create_link(&tz->device->dev.kobj, 913 &tz->thermal_zone->device.kobj, "thermal_zone"); 914 if (result) 915 return result; 916 917 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 918 &tz->device->dev.kobj, "device"); 919 if (result) 920 return result; 921 922 status = acpi_attach_data(tz->device->handle, 923 acpi_bus_private_data_handler, 924 tz->thermal_zone); 925 if (ACPI_FAILURE(status)) { 926 pr_err(PREFIX "Error attaching device data\n"); 927 return -ENODEV; 928 } 929 930 tz->tz_enabled = 1; 931 932 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 933 tz->thermal_zone->id); 934 return 0; 935 } 936 937 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 938 { 939 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 940 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 941 thermal_zone_device_unregister(tz->thermal_zone); 942 tz->thermal_zone = NULL; 943 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 944 } 945 946 947 /* -------------------------------------------------------------------------- 948 Driver Interface 949 -------------------------------------------------------------------------- */ 950 951 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 952 { 953 struct acpi_thermal *tz = acpi_driver_data(device); 954 955 956 if (!tz) 957 return; 958 959 switch (event) { 960 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 961 acpi_thermal_check(tz); 962 break; 963 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 964 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 965 acpi_thermal_check(tz); 966 acpi_bus_generate_netlink_event(device->pnp.device_class, 967 dev_name(&device->dev), event, 0); 968 break; 969 case ACPI_THERMAL_NOTIFY_DEVICES: 970 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 971 acpi_thermal_check(tz); 972 acpi_bus_generate_netlink_event(device->pnp.device_class, 973 dev_name(&device->dev), event, 0); 974 break; 975 default: 976 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 977 "Unsupported event [0x%x]\n", event)); 978 break; 979 } 980 } 981 982 /* 983 * On some platforms, the AML code has dependency about 984 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 985 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 986 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 987 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 988 * if _TMP has never been evaluated. 989 * 990 * As this dependency is totally transparent to OS, evaluate 991 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 992 * _TMP, before they are actually used. 993 */ 994 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 995 { 996 acpi_handle handle = tz->device->handle; 997 unsigned long long value; 998 int i; 999 1000 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 1001 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 1002 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 1003 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1004 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 1005 acpi_status status; 1006 1007 status = acpi_evaluate_integer(handle, name, NULL, &value); 1008 if (status == AE_NOT_FOUND) 1009 break; 1010 } 1011 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 1012 } 1013 1014 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1015 { 1016 int result = 0; 1017 1018 1019 if (!tz) 1020 return -EINVAL; 1021 1022 acpi_thermal_aml_dependency_fix(tz); 1023 1024 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1025 result = acpi_thermal_get_trip_points(tz); 1026 if (result) 1027 return result; 1028 1029 /* Get temperature [_TMP] (required) */ 1030 result = acpi_thermal_get_temperature(tz); 1031 if (result) 1032 return result; 1033 1034 /* Set the cooling mode [_SCP] to active cooling (default) */ 1035 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1036 if (!result) 1037 tz->flags.cooling_mode = 1; 1038 1039 /* Get default polling frequency [_TZP] (optional) */ 1040 if (tzp) 1041 tz->polling_frequency = tzp; 1042 else 1043 acpi_thermal_get_polling_frequency(tz); 1044 1045 return 0; 1046 } 1047 1048 /* 1049 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1050 * handles temperature values with a single decimal place. As a consequence, 1051 * some implementations use an offset of 273.1 and others use an offset of 1052 * 273.2. Try to find out which one is being used, to present the most 1053 * accurate and visually appealing number. 1054 * 1055 * The heuristic below should work for all ACPI thermal zones which have a 1056 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1057 */ 1058 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1059 { 1060 if (tz->trips.critical.flags.valid && 1061 (tz->trips.critical.temperature % 5) == 1) 1062 tz->kelvin_offset = 2731; 1063 else 1064 tz->kelvin_offset = 2732; 1065 } 1066 1067 static int acpi_thermal_add(struct acpi_device *device) 1068 { 1069 int result = 0; 1070 struct acpi_thermal *tz = NULL; 1071 1072 1073 if (!device) 1074 return -EINVAL; 1075 1076 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1077 if (!tz) 1078 return -ENOMEM; 1079 1080 tz->device = device; 1081 strcpy(tz->name, device->pnp.bus_id); 1082 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1083 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1084 device->driver_data = tz; 1085 1086 result = acpi_thermal_get_info(tz); 1087 if (result) 1088 goto free_memory; 1089 1090 acpi_thermal_guess_offset(tz); 1091 1092 result = acpi_thermal_register_thermal_zone(tz); 1093 if (result) 1094 goto free_memory; 1095 1096 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device), 1097 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature)); 1098 goto end; 1099 1100 free_memory: 1101 kfree(tz); 1102 end: 1103 return result; 1104 } 1105 1106 static int acpi_thermal_remove(struct acpi_device *device) 1107 { 1108 struct acpi_thermal *tz = NULL; 1109 1110 if (!device || !acpi_driver_data(device)) 1111 return -EINVAL; 1112 1113 tz = acpi_driver_data(device); 1114 1115 acpi_thermal_unregister_thermal_zone(tz); 1116 kfree(tz); 1117 return 0; 1118 } 1119 1120 #ifdef CONFIG_PM_SLEEP 1121 static int acpi_thermal_resume(struct device *dev) 1122 { 1123 struct acpi_thermal *tz; 1124 int i, j, power_state, result; 1125 1126 if (!dev) 1127 return -EINVAL; 1128 1129 tz = acpi_driver_data(to_acpi_device(dev)); 1130 if (!tz) 1131 return -EINVAL; 1132 1133 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1134 if (!(&tz->trips.active[i])) 1135 break; 1136 if (!tz->trips.active[i].flags.valid) 1137 break; 1138 tz->trips.active[i].flags.enabled = 1; 1139 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1140 result = acpi_bus_update_power( 1141 tz->trips.active[i].devices.handles[j], 1142 &power_state); 1143 if (result || (power_state != ACPI_STATE_D0)) { 1144 tz->trips.active[i].flags.enabled = 0; 1145 break; 1146 } 1147 } 1148 tz->state.active |= tz->trips.active[i].flags.enabled; 1149 } 1150 1151 acpi_thermal_check(tz); 1152 1153 return AE_OK; 1154 } 1155 #endif 1156 1157 static int thermal_act(const struct dmi_system_id *d) { 1158 1159 if (act == 0) { 1160 pr_notice(PREFIX "%s detected: " 1161 "disabling all active thermal trip points\n", d->ident); 1162 act = -1; 1163 } 1164 return 0; 1165 } 1166 static int thermal_nocrt(const struct dmi_system_id *d) { 1167 1168 pr_notice(PREFIX "%s detected: " 1169 "disabling all critical thermal trip point actions.\n", d->ident); 1170 nocrt = 1; 1171 return 0; 1172 } 1173 static int thermal_tzp(const struct dmi_system_id *d) { 1174 1175 if (tzp == 0) { 1176 pr_notice(PREFIX "%s detected: " 1177 "enabling thermal zone polling\n", d->ident); 1178 tzp = 300; /* 300 dS = 30 Seconds */ 1179 } 1180 return 0; 1181 } 1182 static int thermal_psv(const struct dmi_system_id *d) { 1183 1184 if (psv == 0) { 1185 pr_notice(PREFIX "%s detected: " 1186 "disabling all passive thermal trip points\n", d->ident); 1187 psv = -1; 1188 } 1189 return 0; 1190 } 1191 1192 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1193 /* 1194 * Award BIOS on this AOpen makes thermal control almost worthless. 1195 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1196 */ 1197 { 1198 .callback = thermal_act, 1199 .ident = "AOpen i915GMm-HFS", 1200 .matches = { 1201 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1202 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1203 }, 1204 }, 1205 { 1206 .callback = thermal_psv, 1207 .ident = "AOpen i915GMm-HFS", 1208 .matches = { 1209 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1210 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1211 }, 1212 }, 1213 { 1214 .callback = thermal_tzp, 1215 .ident = "AOpen i915GMm-HFS", 1216 .matches = { 1217 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1218 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1219 }, 1220 }, 1221 { 1222 .callback = thermal_nocrt, 1223 .ident = "Gigabyte GA-7ZX", 1224 .matches = { 1225 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1226 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1227 }, 1228 }, 1229 {} 1230 }; 1231 1232 static int __init acpi_thermal_init(void) 1233 { 1234 int result = 0; 1235 1236 dmi_check_system(thermal_dmi_table); 1237 1238 if (off) { 1239 pr_notice(PREFIX "thermal control disabled\n"); 1240 return -ENODEV; 1241 } 1242 1243 result = acpi_bus_register_driver(&acpi_thermal_driver); 1244 if (result < 0) 1245 return -ENODEV; 1246 1247 return 0; 1248 } 1249 1250 static void __exit acpi_thermal_exit(void) 1251 { 1252 1253 acpi_bus_unregister_driver(&acpi_thermal_driver); 1254 1255 return; 1256 } 1257 1258 module_init(acpi_thermal_init); 1259 module_exit(acpi_thermal_exit); 1260