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 <asm/uaccess.h> 45 #include <linux/thermal.h> 46 #include <acpi/acpi_bus.h> 47 #include <acpi/acpi_drivers.h> 48 49 #define PREFIX "ACPI: " 50 51 #define ACPI_THERMAL_CLASS "thermal_zone" 52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 53 #define ACPI_THERMAL_FILE_STATE "state" 54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" 55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" 56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" 57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" 58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 63 #define ACPI_THERMAL_MODE_ACTIVE 0x00 64 65 #define ACPI_THERMAL_MAX_ACTIVE 10 66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 67 68 #define _COMPONENT ACPI_THERMAL_COMPONENT 69 ACPI_MODULE_NAME("thermal"); 70 71 MODULE_AUTHOR("Paul Diefenbaugh"); 72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 73 MODULE_LICENSE("GPL"); 74 75 static int act; 76 module_param(act, int, 0644); 77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 78 79 static int crt; 80 module_param(crt, int, 0644); 81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 82 83 static int tzp; 84 module_param(tzp, int, 0444); 85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 86 87 static int nocrt; 88 module_param(nocrt, int, 0); 89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 90 91 static int off; 92 module_param(off, int, 0); 93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 94 95 static int psv; 96 module_param(psv, int, 0644); 97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 98 99 static int acpi_thermal_add(struct acpi_device *device); 100 static int acpi_thermal_remove(struct acpi_device *device, int type); 101 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 102 103 static const struct acpi_device_id thermal_device_ids[] = { 104 {ACPI_THERMAL_HID, 0}, 105 {"", 0}, 106 }; 107 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 108 109 #ifdef CONFIG_PM_SLEEP 110 static int acpi_thermal_resume(struct device *dev); 111 #endif 112 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume); 113 114 static struct acpi_driver acpi_thermal_driver = { 115 .name = "thermal", 116 .class = ACPI_THERMAL_CLASS, 117 .ids = thermal_device_ids, 118 .ops = { 119 .add = acpi_thermal_add, 120 .remove = acpi_thermal_remove, 121 .notify = acpi_thermal_notify, 122 }, 123 .drv.pm = &acpi_thermal_pm, 124 }; 125 126 struct acpi_thermal_state { 127 u8 critical:1; 128 u8 hot:1; 129 u8 passive:1; 130 u8 active:1; 131 u8 reserved:4; 132 int active_index; 133 }; 134 135 struct acpi_thermal_state_flags { 136 u8 valid:1; 137 u8 enabled:1; 138 u8 reserved:6; 139 }; 140 141 struct acpi_thermal_critical { 142 struct acpi_thermal_state_flags flags; 143 unsigned long temperature; 144 }; 145 146 struct acpi_thermal_hot { 147 struct acpi_thermal_state_flags flags; 148 unsigned long temperature; 149 }; 150 151 struct acpi_thermal_passive { 152 struct acpi_thermal_state_flags flags; 153 unsigned long temperature; 154 unsigned long tc1; 155 unsigned long tc2; 156 unsigned long tsp; 157 struct acpi_handle_list devices; 158 }; 159 160 struct acpi_thermal_active { 161 struct acpi_thermal_state_flags flags; 162 unsigned long temperature; 163 struct acpi_handle_list devices; 164 }; 165 166 struct acpi_thermal_trips { 167 struct acpi_thermal_critical critical; 168 struct acpi_thermal_hot hot; 169 struct acpi_thermal_passive passive; 170 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 171 }; 172 173 struct acpi_thermal_flags { 174 u8 cooling_mode:1; /* _SCP */ 175 u8 devices:1; /* _TZD */ 176 u8 reserved:6; 177 }; 178 179 struct acpi_thermal { 180 struct acpi_device * device; 181 acpi_bus_id name; 182 unsigned long temperature; 183 unsigned long last_temperature; 184 unsigned long polling_frequency; 185 volatile u8 zombie; 186 struct acpi_thermal_flags flags; 187 struct acpi_thermal_state state; 188 struct acpi_thermal_trips trips; 189 struct acpi_handle_list devices; 190 struct thermal_zone_device *thermal_zone; 191 int tz_enabled; 192 int kelvin_offset; 193 struct mutex lock; 194 }; 195 196 /* -------------------------------------------------------------------------- 197 Thermal Zone Management 198 -------------------------------------------------------------------------- */ 199 200 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 201 { 202 acpi_status status = AE_OK; 203 unsigned long long tmp; 204 205 if (!tz) 206 return -EINVAL; 207 208 tz->last_temperature = tz->temperature; 209 210 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 211 if (ACPI_FAILURE(status)) 212 return -ENODEV; 213 214 tz->temperature = tmp; 215 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 216 tz->temperature)); 217 218 return 0; 219 } 220 221 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 222 { 223 acpi_status status = AE_OK; 224 unsigned long long tmp; 225 226 if (!tz) 227 return -EINVAL; 228 229 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 230 if (ACPI_FAILURE(status)) 231 return -ENODEV; 232 233 tz->polling_frequency = tmp; 234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 235 tz->polling_frequency)); 236 237 return 0; 238 } 239 240 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 241 { 242 acpi_status status = AE_OK; 243 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 244 struct acpi_object_list arg_list = { 1, &arg0 }; 245 acpi_handle handle = NULL; 246 247 248 if (!tz) 249 return -EINVAL; 250 251 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 252 if (ACPI_FAILURE(status)) { 253 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 254 return -ENODEV; 255 } 256 257 arg0.integer.value = mode; 258 259 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 260 if (ACPI_FAILURE(status)) 261 return -ENODEV; 262 263 return 0; 264 } 265 266 #define ACPI_TRIPS_CRITICAL 0x01 267 #define ACPI_TRIPS_HOT 0x02 268 #define ACPI_TRIPS_PASSIVE 0x04 269 #define ACPI_TRIPS_ACTIVE 0x08 270 #define ACPI_TRIPS_DEVICES 0x10 271 272 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 273 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 274 275 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 276 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 277 ACPI_TRIPS_DEVICES) 278 279 /* 280 * This exception is thrown out in two cases: 281 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 282 * when re-evaluating the AML code. 283 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 284 * We need to re-bind the cooling devices of a thermal zone when this occurs. 285 */ 286 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 287 do { \ 288 if (flags != ACPI_TRIPS_INIT) \ 289 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 290 "ACPI thermal trip point %s changed\n" \ 291 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 292 } while (0) 293 294 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 295 { 296 acpi_status status = AE_OK; 297 unsigned long long tmp; 298 struct acpi_handle_list devices; 299 int valid = 0; 300 int i; 301 302 /* Critical Shutdown */ 303 if (flag & ACPI_TRIPS_CRITICAL) { 304 status = acpi_evaluate_integer(tz->device->handle, 305 "_CRT", NULL, &tmp); 306 tz->trips.critical.temperature = tmp; 307 /* 308 * Treat freezing temperatures as invalid as well; some 309 * BIOSes return really low values and cause reboots at startup. 310 * Below zero (Celsius) values clearly aren't right for sure.. 311 * ... so lets discard those as invalid. 312 */ 313 if (ACPI_FAILURE(status)) { 314 tz->trips.critical.flags.valid = 0; 315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 316 "No critical threshold\n")); 317 } else if (tmp <= 2732) { 318 printk(KERN_WARNING FW_BUG "Invalid critical threshold " 319 "(%llu)\n", tmp); 320 tz->trips.critical.flags.valid = 0; 321 } else { 322 tz->trips.critical.flags.valid = 1; 323 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 324 "Found critical threshold [%lu]\n", 325 tz->trips.critical.temperature)); 326 } 327 if (tz->trips.critical.flags.valid == 1) { 328 if (crt == -1) { 329 tz->trips.critical.flags.valid = 0; 330 } else if (crt > 0) { 331 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 332 /* 333 * Allow override critical threshold 334 */ 335 if (crt_k > tz->trips.critical.temperature) 336 printk(KERN_WARNING PREFIX 337 "Critical threshold %d C\n", crt); 338 tz->trips.critical.temperature = crt_k; 339 } 340 } 341 } 342 343 /* Critical Sleep (optional) */ 344 if (flag & ACPI_TRIPS_HOT) { 345 status = acpi_evaluate_integer(tz->device->handle, 346 "_HOT", NULL, &tmp); 347 if (ACPI_FAILURE(status)) { 348 tz->trips.hot.flags.valid = 0; 349 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 350 "No hot threshold\n")); 351 } else { 352 tz->trips.hot.temperature = tmp; 353 tz->trips.hot.flags.valid = 1; 354 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 355 "Found hot threshold [%lu]\n", 356 tz->trips.critical.temperature)); 357 } 358 } 359 360 /* Passive (optional) */ 361 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 362 (flag == ACPI_TRIPS_INIT)) { 363 valid = tz->trips.passive.flags.valid; 364 if (psv == -1) { 365 status = AE_SUPPORT; 366 } else if (psv > 0) { 367 tmp = CELSIUS_TO_KELVIN(psv); 368 status = AE_OK; 369 } else { 370 status = acpi_evaluate_integer(tz->device->handle, 371 "_PSV", NULL, &tmp); 372 } 373 374 if (ACPI_FAILURE(status)) 375 tz->trips.passive.flags.valid = 0; 376 else { 377 tz->trips.passive.temperature = tmp; 378 tz->trips.passive.flags.valid = 1; 379 if (flag == ACPI_TRIPS_INIT) { 380 status = acpi_evaluate_integer( 381 tz->device->handle, "_TC1", 382 NULL, &tmp); 383 if (ACPI_FAILURE(status)) 384 tz->trips.passive.flags.valid = 0; 385 else 386 tz->trips.passive.tc1 = tmp; 387 status = acpi_evaluate_integer( 388 tz->device->handle, "_TC2", 389 NULL, &tmp); 390 if (ACPI_FAILURE(status)) 391 tz->trips.passive.flags.valid = 0; 392 else 393 tz->trips.passive.tc2 = tmp; 394 status = acpi_evaluate_integer( 395 tz->device->handle, "_TSP", 396 NULL, &tmp); 397 if (ACPI_FAILURE(status)) 398 tz->trips.passive.flags.valid = 0; 399 else 400 tz->trips.passive.tsp = tmp; 401 } 402 } 403 } 404 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 405 memset(&devices, 0, sizeof(struct acpi_handle_list)); 406 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 407 NULL, &devices); 408 if (ACPI_FAILURE(status)) { 409 printk(KERN_WARNING PREFIX 410 "Invalid passive threshold\n"); 411 tz->trips.passive.flags.valid = 0; 412 } 413 else 414 tz->trips.passive.flags.valid = 1; 415 416 if (memcmp(&tz->trips.passive.devices, &devices, 417 sizeof(struct acpi_handle_list))) { 418 memcpy(&tz->trips.passive.devices, &devices, 419 sizeof(struct acpi_handle_list)); 420 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 421 } 422 } 423 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 424 if (valid != tz->trips.passive.flags.valid) 425 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 426 } 427 428 /* Active (optional) */ 429 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 430 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 431 valid = tz->trips.active[i].flags.valid; 432 433 if (act == -1) 434 break; /* disable all active trip points */ 435 436 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 437 tz->trips.active[i].flags.valid)) { 438 status = acpi_evaluate_integer(tz->device->handle, 439 name, NULL, &tmp); 440 if (ACPI_FAILURE(status)) { 441 tz->trips.active[i].flags.valid = 0; 442 if (i == 0) 443 break; 444 if (act <= 0) 445 break; 446 if (i == 1) 447 tz->trips.active[0].temperature = 448 CELSIUS_TO_KELVIN(act); 449 else 450 /* 451 * Don't allow override higher than 452 * the next higher trip point 453 */ 454 tz->trips.active[i - 1].temperature = 455 (tz->trips.active[i - 2].temperature < 456 CELSIUS_TO_KELVIN(act) ? 457 tz->trips.active[i - 2].temperature : 458 CELSIUS_TO_KELVIN(act)); 459 break; 460 } else { 461 tz->trips.active[i].temperature = tmp; 462 tz->trips.active[i].flags.valid = 1; 463 } 464 } 465 466 name[2] = 'L'; 467 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 468 memset(&devices, 0, sizeof(struct acpi_handle_list)); 469 status = acpi_evaluate_reference(tz->device->handle, 470 name, NULL, &devices); 471 if (ACPI_FAILURE(status)) { 472 printk(KERN_WARNING PREFIX 473 "Invalid active%d threshold\n", i); 474 tz->trips.active[i].flags.valid = 0; 475 } 476 else 477 tz->trips.active[i].flags.valid = 1; 478 479 if (memcmp(&tz->trips.active[i].devices, &devices, 480 sizeof(struct acpi_handle_list))) { 481 memcpy(&tz->trips.active[i].devices, &devices, 482 sizeof(struct acpi_handle_list)); 483 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 484 } 485 } 486 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 487 if (valid != tz->trips.active[i].flags.valid) 488 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 489 490 if (!tz->trips.active[i].flags.valid) 491 break; 492 } 493 494 if (flag & ACPI_TRIPS_DEVICES) { 495 memset(&devices, 0, sizeof(struct acpi_handle_list)); 496 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 497 NULL, &devices); 498 if (memcmp(&tz->devices, &devices, 499 sizeof(struct acpi_handle_list))) { 500 memcpy(&tz->devices, &devices, 501 sizeof(struct acpi_handle_list)); 502 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 503 } 504 } 505 506 return 0; 507 } 508 509 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 510 { 511 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 512 513 if (ret) 514 return ret; 515 516 valid = tz->trips.critical.flags.valid | 517 tz->trips.hot.flags.valid | 518 tz->trips.passive.flags.valid; 519 520 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 521 valid |= tz->trips.active[i].flags.valid; 522 523 if (!valid) { 524 printk(KERN_WARNING FW_BUG "No valid trip found\n"); 525 return -ENODEV; 526 } 527 return 0; 528 } 529 530 static void acpi_thermal_check(void *data) 531 { 532 struct acpi_thermal *tz = data; 533 534 thermal_zone_device_update(tz->thermal_zone); 535 } 536 537 /* sys I/F for generic thermal sysfs support */ 538 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 539 540 static int thermal_get_temp(struct thermal_zone_device *thermal, 541 unsigned long *temp) 542 { 543 struct acpi_thermal *tz = thermal->devdata; 544 int result; 545 546 if (!tz) 547 return -EINVAL; 548 549 result = acpi_thermal_get_temperature(tz); 550 if (result) 551 return result; 552 553 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 554 return 0; 555 } 556 557 static int thermal_get_mode(struct thermal_zone_device *thermal, 558 enum thermal_device_mode *mode) 559 { 560 struct acpi_thermal *tz = thermal->devdata; 561 562 if (!tz) 563 return -EINVAL; 564 565 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 566 THERMAL_DEVICE_DISABLED; 567 568 return 0; 569 } 570 571 static int thermal_set_mode(struct thermal_zone_device *thermal, 572 enum thermal_device_mode mode) 573 { 574 struct acpi_thermal *tz = thermal->devdata; 575 int enable; 576 577 if (!tz) 578 return -EINVAL; 579 580 /* 581 * enable/disable thermal management from ACPI thermal driver 582 */ 583 if (mode == THERMAL_DEVICE_ENABLED) 584 enable = 1; 585 else if (mode == THERMAL_DEVICE_DISABLED) 586 enable = 0; 587 else 588 return -EINVAL; 589 590 if (enable != tz->tz_enabled) { 591 tz->tz_enabled = enable; 592 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 593 "%s kernel ACPI thermal control\n", 594 tz->tz_enabled ? "Enable" : "Disable")); 595 acpi_thermal_check(tz); 596 } 597 return 0; 598 } 599 600 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 601 int trip, enum thermal_trip_type *type) 602 { 603 struct acpi_thermal *tz = thermal->devdata; 604 int i; 605 606 if (!tz || trip < 0) 607 return -EINVAL; 608 609 if (tz->trips.critical.flags.valid) { 610 if (!trip) { 611 *type = THERMAL_TRIP_CRITICAL; 612 return 0; 613 } 614 trip--; 615 } 616 617 if (tz->trips.hot.flags.valid) { 618 if (!trip) { 619 *type = THERMAL_TRIP_HOT; 620 return 0; 621 } 622 trip--; 623 } 624 625 if (tz->trips.passive.flags.valid) { 626 if (!trip) { 627 *type = THERMAL_TRIP_PASSIVE; 628 return 0; 629 } 630 trip--; 631 } 632 633 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 634 tz->trips.active[i].flags.valid; i++) { 635 if (!trip) { 636 *type = THERMAL_TRIP_ACTIVE; 637 return 0; 638 } 639 trip--; 640 } 641 642 return -EINVAL; 643 } 644 645 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 646 int trip, unsigned long *temp) 647 { 648 struct acpi_thermal *tz = thermal->devdata; 649 int i; 650 651 if (!tz || trip < 0) 652 return -EINVAL; 653 654 if (tz->trips.critical.flags.valid) { 655 if (!trip) { 656 *temp = KELVIN_TO_MILLICELSIUS( 657 tz->trips.critical.temperature, 658 tz->kelvin_offset); 659 return 0; 660 } 661 trip--; 662 } 663 664 if (tz->trips.hot.flags.valid) { 665 if (!trip) { 666 *temp = KELVIN_TO_MILLICELSIUS( 667 tz->trips.hot.temperature, 668 tz->kelvin_offset); 669 return 0; 670 } 671 trip--; 672 } 673 674 if (tz->trips.passive.flags.valid) { 675 if (!trip) { 676 *temp = KELVIN_TO_MILLICELSIUS( 677 tz->trips.passive.temperature, 678 tz->kelvin_offset); 679 return 0; 680 } 681 trip--; 682 } 683 684 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 685 tz->trips.active[i].flags.valid; i++) { 686 if (!trip) { 687 *temp = KELVIN_TO_MILLICELSIUS( 688 tz->trips.active[i].temperature, 689 tz->kelvin_offset); 690 return 0; 691 } 692 trip--; 693 } 694 695 return -EINVAL; 696 } 697 698 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 699 unsigned long *temperature) { 700 struct acpi_thermal *tz = thermal->devdata; 701 702 if (tz->trips.critical.flags.valid) { 703 *temperature = KELVIN_TO_MILLICELSIUS( 704 tz->trips.critical.temperature, 705 tz->kelvin_offset); 706 return 0; 707 } else 708 return -EINVAL; 709 } 710 711 static int thermal_get_trend(struct thermal_zone_device *thermal, 712 int trip, enum thermal_trend *trend) 713 { 714 struct acpi_thermal *tz = thermal->devdata; 715 enum thermal_trip_type type; 716 int i; 717 718 if (thermal_get_trip_type(thermal, trip, &type)) 719 return -EINVAL; 720 721 if (type == THERMAL_TRIP_ACTIVE) { 722 /* aggressive active cooling */ 723 *trend = THERMAL_TREND_RAISING; 724 return 0; 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_proc_event(tz->device, type, 1); 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 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 else 826 result = thermal_zone_unbind_cooling_device 827 (thermal, trip, cdev); 828 if (result) 829 goto failed; 830 } 831 } 832 833 for (i = 0; i < tz->devices.count; i++) { 834 handle = tz->devices.handles[i]; 835 status = acpi_bus_get_device(handle, &dev); 836 if (ACPI_SUCCESS(status) && (dev == device)) { 837 if (bind) 838 result = thermal_zone_bind_cooling_device 839 (thermal, -1, cdev, 840 THERMAL_NO_LIMIT, 841 THERMAL_NO_LIMIT); 842 else 843 result = thermal_zone_unbind_cooling_device 844 (thermal, -1, cdev); 845 if (result) 846 goto failed; 847 } 848 } 849 850 failed: 851 return result; 852 } 853 854 static int 855 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 856 struct thermal_cooling_device *cdev) 857 { 858 return acpi_thermal_cooling_device_cb(thermal, cdev, true); 859 } 860 861 static int 862 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 863 struct thermal_cooling_device *cdev) 864 { 865 return acpi_thermal_cooling_device_cb(thermal, cdev, false); 866 } 867 868 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = { 869 .bind = acpi_thermal_bind_cooling_device, 870 .unbind = acpi_thermal_unbind_cooling_device, 871 .get_temp = thermal_get_temp, 872 .get_mode = thermal_get_mode, 873 .set_mode = thermal_set_mode, 874 .get_trip_type = thermal_get_trip_type, 875 .get_trip_temp = thermal_get_trip_temp, 876 .get_crit_temp = thermal_get_crit_temp, 877 .get_trend = thermal_get_trend, 878 .notify = thermal_notify, 879 }; 880 881 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 882 { 883 int trips = 0; 884 int result; 885 acpi_status status; 886 int i; 887 888 if (tz->trips.critical.flags.valid) 889 trips++; 890 891 if (tz->trips.hot.flags.valid) 892 trips++; 893 894 if (tz->trips.passive.flags.valid) 895 trips++; 896 897 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 898 tz->trips.active[i].flags.valid; i++, trips++); 899 900 if (tz->trips.passive.flags.valid) 901 tz->thermal_zone = 902 thermal_zone_device_register("acpitz", trips, 0, tz, 903 &acpi_thermal_zone_ops, NULL, 904 tz->trips.passive.tsp*100, 905 tz->polling_frequency*100); 906 else 907 tz->thermal_zone = 908 thermal_zone_device_register("acpitz", trips, 0, tz, 909 &acpi_thermal_zone_ops, NULL, 910 0, tz->polling_frequency*100); 911 if (IS_ERR(tz->thermal_zone)) 912 return -ENODEV; 913 914 result = sysfs_create_link(&tz->device->dev.kobj, 915 &tz->thermal_zone->device.kobj, "thermal_zone"); 916 if (result) 917 return result; 918 919 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 920 &tz->device->dev.kobj, "device"); 921 if (result) 922 return result; 923 924 status = acpi_attach_data(tz->device->handle, 925 acpi_bus_private_data_handler, 926 tz->thermal_zone); 927 if (ACPI_FAILURE(status)) { 928 printk(KERN_ERR PREFIX 929 "Error attaching device data\n"); 930 return -ENODEV; 931 } 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_detach_data(tz->device->handle, acpi_bus_private_data_handler); 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_proc_event(device, event, 0); 970 acpi_bus_generate_netlink_event(device->pnp.device_class, 971 dev_name(&device->dev), event, 0); 972 break; 973 case ACPI_THERMAL_NOTIFY_DEVICES: 974 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 975 acpi_thermal_check(tz); 976 acpi_bus_generate_proc_event(device, event, 0); 977 acpi_bus_generate_netlink_event(device->pnp.device_class, 978 dev_name(&device->dev), event, 0); 979 break; 980 default: 981 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 982 "Unsupported event [0x%x]\n", event)); 983 break; 984 } 985 } 986 987 /* 988 * On some platforms, the AML code has dependency about 989 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. 990 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after 991 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. 992 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 993 * if _TMP has never been evaluated. 994 * 995 * As this dependency is totally transparent to OS, evaluate 996 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, 997 * _TMP, before they are actually used. 998 */ 999 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) 1000 { 1001 acpi_handle handle = tz->device->handle; 1002 unsigned long long value; 1003 int i; 1004 1005 acpi_evaluate_integer(handle, "_CRT", NULL, &value); 1006 acpi_evaluate_integer(handle, "_HOT", NULL, &value); 1007 acpi_evaluate_integer(handle, "_PSV", NULL, &value); 1008 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1009 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 1010 acpi_status status; 1011 1012 status = acpi_evaluate_integer(handle, name, NULL, &value); 1013 if (status == AE_NOT_FOUND) 1014 break; 1015 } 1016 acpi_evaluate_integer(handle, "_TMP", NULL, &value); 1017 } 1018 1019 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1020 { 1021 int result = 0; 1022 1023 1024 if (!tz) 1025 return -EINVAL; 1026 1027 acpi_thermal_aml_dependency_fix(tz); 1028 1029 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1030 result = acpi_thermal_get_trip_points(tz); 1031 if (result) 1032 return result; 1033 1034 /* Get temperature [_TMP] (required) */ 1035 result = acpi_thermal_get_temperature(tz); 1036 if (result) 1037 return result; 1038 1039 /* Set the cooling mode [_SCP] to active cooling (default) */ 1040 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1041 if (!result) 1042 tz->flags.cooling_mode = 1; 1043 1044 /* Get default polling frequency [_TZP] (optional) */ 1045 if (tzp) 1046 tz->polling_frequency = tzp; 1047 else 1048 acpi_thermal_get_polling_frequency(tz); 1049 1050 return 0; 1051 } 1052 1053 /* 1054 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1055 * handles temperature values with a single decimal place. As a consequence, 1056 * some implementations use an offset of 273.1 and others use an offset of 1057 * 273.2. Try to find out which one is being used, to present the most 1058 * accurate and visually appealing number. 1059 * 1060 * The heuristic below should work for all ACPI thermal zones which have a 1061 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1062 */ 1063 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1064 { 1065 if (tz->trips.critical.flags.valid && 1066 (tz->trips.critical.temperature % 5) == 1) 1067 tz->kelvin_offset = 2731; 1068 else 1069 tz->kelvin_offset = 2732; 1070 } 1071 1072 static int acpi_thermal_add(struct acpi_device *device) 1073 { 1074 int result = 0; 1075 struct acpi_thermal *tz = NULL; 1076 1077 1078 if (!device) 1079 return -EINVAL; 1080 1081 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1082 if (!tz) 1083 return -ENOMEM; 1084 1085 tz->device = device; 1086 strcpy(tz->name, device->pnp.bus_id); 1087 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1088 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1089 device->driver_data = tz; 1090 mutex_init(&tz->lock); 1091 1092 1093 result = acpi_thermal_get_info(tz); 1094 if (result) 1095 goto free_memory; 1096 1097 acpi_thermal_guess_offset(tz); 1098 1099 result = acpi_thermal_register_thermal_zone(tz); 1100 if (result) 1101 goto free_memory; 1102 1103 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1104 acpi_device_name(device), acpi_device_bid(device), 1105 KELVIN_TO_CELSIUS(tz->temperature)); 1106 goto end; 1107 1108 free_memory: 1109 kfree(tz); 1110 end: 1111 return result; 1112 } 1113 1114 static int acpi_thermal_remove(struct acpi_device *device, int type) 1115 { 1116 struct acpi_thermal *tz = NULL; 1117 1118 if (!device || !acpi_driver_data(device)) 1119 return -EINVAL; 1120 1121 tz = acpi_driver_data(device); 1122 1123 acpi_thermal_unregister_thermal_zone(tz); 1124 mutex_destroy(&tz->lock); 1125 kfree(tz); 1126 return 0; 1127 } 1128 1129 #ifdef CONFIG_PM_SLEEP 1130 static int acpi_thermal_resume(struct device *dev) 1131 { 1132 struct acpi_thermal *tz; 1133 int i, j, power_state, result; 1134 1135 if (!dev) 1136 return -EINVAL; 1137 1138 tz = acpi_driver_data(to_acpi_device(dev)); 1139 if (!tz) 1140 return -EINVAL; 1141 1142 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1143 if (!(&tz->trips.active[i])) 1144 break; 1145 if (!tz->trips.active[i].flags.valid) 1146 break; 1147 tz->trips.active[i].flags.enabled = 1; 1148 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1149 result = acpi_bus_update_power( 1150 tz->trips.active[i].devices.handles[j], 1151 &power_state); 1152 if (result || (power_state != ACPI_STATE_D0)) { 1153 tz->trips.active[i].flags.enabled = 0; 1154 break; 1155 } 1156 } 1157 tz->state.active |= tz->trips.active[i].flags.enabled; 1158 } 1159 1160 acpi_thermal_check(tz); 1161 1162 return AE_OK; 1163 } 1164 #endif 1165 1166 static int thermal_act(const struct dmi_system_id *d) { 1167 1168 if (act == 0) { 1169 printk(KERN_NOTICE "ACPI: %s detected: " 1170 "disabling all active thermal trip points\n", d->ident); 1171 act = -1; 1172 } 1173 return 0; 1174 } 1175 static int thermal_nocrt(const struct dmi_system_id *d) { 1176 1177 printk(KERN_NOTICE "ACPI: %s detected: " 1178 "disabling all critical thermal trip point actions.\n", d->ident); 1179 nocrt = 1; 1180 return 0; 1181 } 1182 static int thermal_tzp(const struct dmi_system_id *d) { 1183 1184 if (tzp == 0) { 1185 printk(KERN_NOTICE "ACPI: %s detected: " 1186 "enabling thermal zone polling\n", d->ident); 1187 tzp = 300; /* 300 dS = 30 Seconds */ 1188 } 1189 return 0; 1190 } 1191 static int thermal_psv(const struct dmi_system_id *d) { 1192 1193 if (psv == 0) { 1194 printk(KERN_NOTICE "ACPI: %s detected: " 1195 "disabling all passive thermal trip points\n", d->ident); 1196 psv = -1; 1197 } 1198 return 0; 1199 } 1200 1201 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1202 /* 1203 * Award BIOS on this AOpen makes thermal control almost worthless. 1204 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1205 */ 1206 { 1207 .callback = thermal_act, 1208 .ident = "AOpen i915GMm-HFS", 1209 .matches = { 1210 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1211 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1212 }, 1213 }, 1214 { 1215 .callback = thermal_psv, 1216 .ident = "AOpen i915GMm-HFS", 1217 .matches = { 1218 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1219 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1220 }, 1221 }, 1222 { 1223 .callback = thermal_tzp, 1224 .ident = "AOpen i915GMm-HFS", 1225 .matches = { 1226 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1227 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1228 }, 1229 }, 1230 { 1231 .callback = thermal_nocrt, 1232 .ident = "Gigabyte GA-7ZX", 1233 .matches = { 1234 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1235 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1236 }, 1237 }, 1238 {} 1239 }; 1240 1241 static int __init acpi_thermal_init(void) 1242 { 1243 int result = 0; 1244 1245 dmi_check_system(thermal_dmi_table); 1246 1247 if (off) { 1248 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1249 return -ENODEV; 1250 } 1251 1252 result = acpi_bus_register_driver(&acpi_thermal_driver); 1253 if (result < 0) 1254 return -ENODEV; 1255 1256 return 0; 1257 } 1258 1259 static void __exit acpi_thermal_exit(void) 1260 { 1261 1262 acpi_bus_unregister_driver(&acpi_thermal_driver); 1263 1264 return; 1265 } 1266 1267 module_init(acpi_thermal_init); 1268 module_exit(acpi_thermal_exit); 1269