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 int acpi_thermal_resume(struct acpi_device *device); 102 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 103 104 static const struct acpi_device_id thermal_device_ids[] = { 105 {ACPI_THERMAL_HID, 0}, 106 {"", 0}, 107 }; 108 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 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 .resume = acpi_thermal_resume, 118 .notify = acpi_thermal_notify, 119 }, 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 struct mutex lock; 190 }; 191 192 /* -------------------------------------------------------------------------- 193 Thermal Zone Management 194 -------------------------------------------------------------------------- */ 195 196 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 197 { 198 acpi_status status = AE_OK; 199 unsigned long long tmp; 200 201 if (!tz) 202 return -EINVAL; 203 204 tz->last_temperature = tz->temperature; 205 206 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 207 if (ACPI_FAILURE(status)) 208 return -ENODEV; 209 210 tz->temperature = tmp; 211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 212 tz->temperature)); 213 214 return 0; 215 } 216 217 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 218 { 219 acpi_status status = AE_OK; 220 unsigned long long tmp; 221 222 if (!tz) 223 return -EINVAL; 224 225 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 226 if (ACPI_FAILURE(status)) 227 return -ENODEV; 228 229 tz->polling_frequency = tmp; 230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 231 tz->polling_frequency)); 232 233 return 0; 234 } 235 236 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 237 { 238 acpi_status status = AE_OK; 239 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 240 struct acpi_object_list arg_list = { 1, &arg0 }; 241 acpi_handle handle = NULL; 242 243 244 if (!tz) 245 return -EINVAL; 246 247 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 248 if (ACPI_FAILURE(status)) { 249 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 250 return -ENODEV; 251 } 252 253 arg0.integer.value = mode; 254 255 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 256 if (ACPI_FAILURE(status)) 257 return -ENODEV; 258 259 return 0; 260 } 261 262 #define ACPI_TRIPS_CRITICAL 0x01 263 #define ACPI_TRIPS_HOT 0x02 264 #define ACPI_TRIPS_PASSIVE 0x04 265 #define ACPI_TRIPS_ACTIVE 0x08 266 #define ACPI_TRIPS_DEVICES 0x10 267 268 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 269 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 270 271 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 272 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 273 ACPI_TRIPS_DEVICES) 274 275 /* 276 * This exception is thrown out in two cases: 277 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 278 * when re-evaluating the AML code. 279 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 280 * We need to re-bind the cooling devices of a thermal zone when this occurs. 281 */ 282 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 283 do { \ 284 if (flags != ACPI_TRIPS_INIT) \ 285 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 286 "ACPI thermal trip point %s changed\n" \ 287 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 288 } while (0) 289 290 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 291 { 292 acpi_status status = AE_OK; 293 unsigned long long tmp; 294 struct acpi_handle_list devices; 295 int valid = 0; 296 int i; 297 298 /* Critical Shutdown */ 299 if (flag & ACPI_TRIPS_CRITICAL) { 300 status = acpi_evaluate_integer(tz->device->handle, 301 "_CRT", NULL, &tmp); 302 tz->trips.critical.temperature = tmp; 303 /* 304 * Treat freezing temperatures as invalid as well; some 305 * BIOSes return really low values and cause reboots at startup. 306 * Below zero (Celsius) values clearly aren't right for sure.. 307 * ... so lets discard those as invalid. 308 */ 309 if (ACPI_FAILURE(status)) { 310 tz->trips.critical.flags.valid = 0; 311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 312 "No critical threshold\n")); 313 } else if (tmp <= 2732) { 314 printk(KERN_WARNING FW_BUG "Invalid critical threshold " 315 "(%llu)\n", tmp); 316 tz->trips.critical.flags.valid = 0; 317 } else { 318 tz->trips.critical.flags.valid = 1; 319 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 320 "Found critical threshold [%lu]\n", 321 tz->trips.critical.temperature)); 322 } 323 if (tz->trips.critical.flags.valid == 1) { 324 if (crt == -1) { 325 tz->trips.critical.flags.valid = 0; 326 } else if (crt > 0) { 327 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 328 /* 329 * Allow override critical threshold 330 */ 331 if (crt_k > tz->trips.critical.temperature) 332 printk(KERN_WARNING PREFIX 333 "Critical threshold %d C\n", crt); 334 tz->trips.critical.temperature = crt_k; 335 } 336 } 337 } 338 339 /* Critical Sleep (optional) */ 340 if (flag & ACPI_TRIPS_HOT) { 341 status = acpi_evaluate_integer(tz->device->handle, 342 "_HOT", NULL, &tmp); 343 if (ACPI_FAILURE(status)) { 344 tz->trips.hot.flags.valid = 0; 345 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 346 "No hot threshold\n")); 347 } else { 348 tz->trips.hot.temperature = tmp; 349 tz->trips.hot.flags.valid = 1; 350 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 351 "Found hot threshold [%lu]\n", 352 tz->trips.critical.temperature)); 353 } 354 } 355 356 /* Passive (optional) */ 357 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 358 (flag == ACPI_TRIPS_INIT)) { 359 valid = tz->trips.passive.flags.valid; 360 if (psv == -1) { 361 status = AE_SUPPORT; 362 } else if (psv > 0) { 363 tmp = CELSIUS_TO_KELVIN(psv); 364 status = AE_OK; 365 } else { 366 status = acpi_evaluate_integer(tz->device->handle, 367 "_PSV", NULL, &tmp); 368 } 369 370 if (ACPI_FAILURE(status)) 371 tz->trips.passive.flags.valid = 0; 372 else { 373 tz->trips.passive.temperature = tmp; 374 tz->trips.passive.flags.valid = 1; 375 if (flag == ACPI_TRIPS_INIT) { 376 status = acpi_evaluate_integer( 377 tz->device->handle, "_TC1", 378 NULL, &tmp); 379 if (ACPI_FAILURE(status)) 380 tz->trips.passive.flags.valid = 0; 381 else 382 tz->trips.passive.tc1 = tmp; 383 status = acpi_evaluate_integer( 384 tz->device->handle, "_TC2", 385 NULL, &tmp); 386 if (ACPI_FAILURE(status)) 387 tz->trips.passive.flags.valid = 0; 388 else 389 tz->trips.passive.tc2 = tmp; 390 status = acpi_evaluate_integer( 391 tz->device->handle, "_TSP", 392 NULL, &tmp); 393 if (ACPI_FAILURE(status)) 394 tz->trips.passive.flags.valid = 0; 395 else 396 tz->trips.passive.tsp = tmp; 397 } 398 } 399 } 400 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 401 memset(&devices, 0, sizeof(struct acpi_handle_list)); 402 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 403 NULL, &devices); 404 if (ACPI_FAILURE(status)) { 405 printk(KERN_WARNING PREFIX 406 "Invalid passive threshold\n"); 407 tz->trips.passive.flags.valid = 0; 408 } 409 else 410 tz->trips.passive.flags.valid = 1; 411 412 if (memcmp(&tz->trips.passive.devices, &devices, 413 sizeof(struct acpi_handle_list))) { 414 memcpy(&tz->trips.passive.devices, &devices, 415 sizeof(struct acpi_handle_list)); 416 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 417 } 418 } 419 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 420 if (valid != tz->trips.passive.flags.valid) 421 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 422 } 423 424 /* Active (optional) */ 425 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 426 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 427 valid = tz->trips.active[i].flags.valid; 428 429 if (act == -1) 430 break; /* disable all active trip points */ 431 432 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 433 tz->trips.active[i].flags.valid)) { 434 status = acpi_evaluate_integer(tz->device->handle, 435 name, NULL, &tmp); 436 if (ACPI_FAILURE(status)) { 437 tz->trips.active[i].flags.valid = 0; 438 if (i == 0) 439 break; 440 if (act <= 0) 441 break; 442 if (i == 1) 443 tz->trips.active[0].temperature = 444 CELSIUS_TO_KELVIN(act); 445 else 446 /* 447 * Don't allow override higher than 448 * the next higher trip point 449 */ 450 tz->trips.active[i - 1].temperature = 451 (tz->trips.active[i - 2].temperature < 452 CELSIUS_TO_KELVIN(act) ? 453 tz->trips.active[i - 2].temperature : 454 CELSIUS_TO_KELVIN(act)); 455 break; 456 } else { 457 tz->trips.active[i].temperature = tmp; 458 tz->trips.active[i].flags.valid = 1; 459 } 460 } 461 462 name[2] = 'L'; 463 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 464 memset(&devices, 0, sizeof(struct acpi_handle_list)); 465 status = acpi_evaluate_reference(tz->device->handle, 466 name, NULL, &devices); 467 if (ACPI_FAILURE(status)) { 468 printk(KERN_WARNING PREFIX 469 "Invalid active%d threshold\n", i); 470 tz->trips.active[i].flags.valid = 0; 471 } 472 else 473 tz->trips.active[i].flags.valid = 1; 474 475 if (memcmp(&tz->trips.active[i].devices, &devices, 476 sizeof(struct acpi_handle_list))) { 477 memcpy(&tz->trips.active[i].devices, &devices, 478 sizeof(struct acpi_handle_list)); 479 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 480 } 481 } 482 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 483 if (valid != tz->trips.active[i].flags.valid) 484 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 485 486 if (!tz->trips.active[i].flags.valid) 487 break; 488 } 489 490 if (flag & ACPI_TRIPS_DEVICES) { 491 memset(&devices, 0, sizeof(struct acpi_handle_list)); 492 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 493 NULL, &devices); 494 if (memcmp(&tz->devices, &devices, 495 sizeof(struct acpi_handle_list))) { 496 memcpy(&tz->devices, &devices, 497 sizeof(struct acpi_handle_list)); 498 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 499 } 500 } 501 502 return 0; 503 } 504 505 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 506 { 507 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 508 509 if (ret) 510 return ret; 511 512 valid = tz->trips.critical.flags.valid | 513 tz->trips.hot.flags.valid | 514 tz->trips.passive.flags.valid; 515 516 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 517 valid |= tz->trips.active[i].flags.valid; 518 519 if (!valid) { 520 printk(KERN_WARNING FW_BUG "No valid trip found\n"); 521 return -ENODEV; 522 } 523 return 0; 524 } 525 526 static void acpi_thermal_check(void *data) 527 { 528 struct acpi_thermal *tz = data; 529 530 thermal_zone_device_update(tz->thermal_zone); 531 } 532 533 /* sys I/F for generic thermal sysfs support */ 534 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 535 536 static int thermal_get_temp(struct thermal_zone_device *thermal, 537 unsigned long *temp) 538 { 539 struct acpi_thermal *tz = thermal->devdata; 540 int result; 541 542 if (!tz) 543 return -EINVAL; 544 545 result = acpi_thermal_get_temperature(tz); 546 if (result) 547 return result; 548 549 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 550 return 0; 551 } 552 553 static const char enabled[] = "kernel"; 554 static const char disabled[] = "user"; 555 static int thermal_get_mode(struct thermal_zone_device *thermal, 556 enum thermal_device_mode *mode) 557 { 558 struct acpi_thermal *tz = thermal->devdata; 559 560 if (!tz) 561 return -EINVAL; 562 563 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 564 THERMAL_DEVICE_DISABLED; 565 566 return 0; 567 } 568 569 static int thermal_set_mode(struct thermal_zone_device *thermal, 570 enum thermal_device_mode mode) 571 { 572 struct acpi_thermal *tz = thermal->devdata; 573 int enable; 574 575 if (!tz) 576 return -EINVAL; 577 578 /* 579 * enable/disable thermal management from ACPI thermal driver 580 */ 581 if (mode == THERMAL_DEVICE_ENABLED) 582 enable = 1; 583 else if (mode == THERMAL_DEVICE_DISABLED) 584 enable = 0; 585 else 586 return -EINVAL; 587 588 if (enable != tz->tz_enabled) { 589 tz->tz_enabled = enable; 590 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 591 "%s ACPI thermal control\n", 592 tz->tz_enabled ? enabled : disabled)); 593 acpi_thermal_check(tz); 594 } 595 return 0; 596 } 597 598 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 599 int trip, enum thermal_trip_type *type) 600 { 601 struct acpi_thermal *tz = thermal->devdata; 602 int i; 603 604 if (!tz || trip < 0) 605 return -EINVAL; 606 607 if (tz->trips.critical.flags.valid) { 608 if (!trip) { 609 *type = THERMAL_TRIP_CRITICAL; 610 return 0; 611 } 612 trip--; 613 } 614 615 if (tz->trips.hot.flags.valid) { 616 if (!trip) { 617 *type = THERMAL_TRIP_HOT; 618 return 0; 619 } 620 trip--; 621 } 622 623 if (tz->trips.passive.flags.valid) { 624 if (!trip) { 625 *type = THERMAL_TRIP_PASSIVE; 626 return 0; 627 } 628 trip--; 629 } 630 631 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 632 tz->trips.active[i].flags.valid; i++) { 633 if (!trip) { 634 *type = THERMAL_TRIP_ACTIVE; 635 return 0; 636 } 637 trip--; 638 } 639 640 return -EINVAL; 641 } 642 643 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 644 int trip, unsigned long *temp) 645 { 646 struct acpi_thermal *tz = thermal->devdata; 647 int i; 648 649 if (!tz || trip < 0) 650 return -EINVAL; 651 652 if (tz->trips.critical.flags.valid) { 653 if (!trip) { 654 *temp = KELVIN_TO_MILLICELSIUS( 655 tz->trips.critical.temperature, 656 tz->kelvin_offset); 657 return 0; 658 } 659 trip--; 660 } 661 662 if (tz->trips.hot.flags.valid) { 663 if (!trip) { 664 *temp = KELVIN_TO_MILLICELSIUS( 665 tz->trips.hot.temperature, 666 tz->kelvin_offset); 667 return 0; 668 } 669 trip--; 670 } 671 672 if (tz->trips.passive.flags.valid) { 673 if (!trip) { 674 *temp = KELVIN_TO_MILLICELSIUS( 675 tz->trips.passive.temperature, 676 tz->kelvin_offset); 677 return 0; 678 } 679 trip--; 680 } 681 682 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 683 tz->trips.active[i].flags.valid; i++) { 684 if (!trip) { 685 *temp = KELVIN_TO_MILLICELSIUS( 686 tz->trips.active[i].temperature, 687 tz->kelvin_offset); 688 return 0; 689 } 690 trip--; 691 } 692 693 return -EINVAL; 694 } 695 696 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 697 unsigned long *temperature) { 698 struct acpi_thermal *tz = thermal->devdata; 699 700 if (tz->trips.critical.flags.valid) { 701 *temperature = KELVIN_TO_MILLICELSIUS( 702 tz->trips.critical.temperature, 703 tz->kelvin_offset); 704 return 0; 705 } else 706 return -EINVAL; 707 } 708 709 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 710 enum thermal_trip_type trip_type) 711 { 712 u8 type = 0; 713 struct acpi_thermal *tz = thermal->devdata; 714 715 if (trip_type == THERMAL_TRIP_CRITICAL) 716 type = ACPI_THERMAL_NOTIFY_CRITICAL; 717 else if (trip_type == THERMAL_TRIP_HOT) 718 type = ACPI_THERMAL_NOTIFY_HOT; 719 else 720 return 0; 721 722 acpi_bus_generate_proc_event(tz->device, type, 1); 723 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 724 dev_name(&tz->device->dev), type, 1); 725 726 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 727 return 1; 728 729 return 0; 730 } 731 732 typedef int (*cb)(struct thermal_zone_device *, int, 733 struct thermal_cooling_device *); 734 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 735 struct thermal_cooling_device *cdev, 736 cb action) 737 { 738 struct acpi_device *device = cdev->devdata; 739 struct acpi_thermal *tz = thermal->devdata; 740 struct acpi_device *dev; 741 acpi_status status; 742 acpi_handle handle; 743 int i; 744 int j; 745 int trip = -1; 746 int result = 0; 747 748 if (tz->trips.critical.flags.valid) 749 trip++; 750 751 if (tz->trips.hot.flags.valid) 752 trip++; 753 754 if (tz->trips.passive.flags.valid) { 755 trip++; 756 for (i = 0; i < tz->trips.passive.devices.count; 757 i++) { 758 handle = tz->trips.passive.devices.handles[i]; 759 status = acpi_bus_get_device(handle, &dev); 760 if (ACPI_SUCCESS(status) && (dev == device)) { 761 result = action(thermal, trip, cdev); 762 if (result) 763 goto failed; 764 } 765 } 766 } 767 768 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 769 if (!tz->trips.active[i].flags.valid) 770 break; 771 trip++; 772 for (j = 0; 773 j < tz->trips.active[i].devices.count; 774 j++) { 775 handle = tz->trips.active[i].devices.handles[j]; 776 status = acpi_bus_get_device(handle, &dev); 777 if (ACPI_SUCCESS(status) && (dev == device)) { 778 result = action(thermal, trip, cdev); 779 if (result) 780 goto failed; 781 } 782 } 783 } 784 785 for (i = 0; i < tz->devices.count; i++) { 786 handle = tz->devices.handles[i]; 787 status = acpi_bus_get_device(handle, &dev); 788 if (ACPI_SUCCESS(status) && (dev == device)) { 789 result = action(thermal, -1, cdev); 790 if (result) 791 goto failed; 792 } 793 } 794 795 failed: 796 return result; 797 } 798 799 static int 800 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 801 struct thermal_cooling_device *cdev) 802 { 803 return acpi_thermal_cooling_device_cb(thermal, cdev, 804 thermal_zone_bind_cooling_device); 805 } 806 807 static int 808 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 809 struct thermal_cooling_device *cdev) 810 { 811 return acpi_thermal_cooling_device_cb(thermal, cdev, 812 thermal_zone_unbind_cooling_device); 813 } 814 815 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 816 .bind = acpi_thermal_bind_cooling_device, 817 .unbind = acpi_thermal_unbind_cooling_device, 818 .get_temp = thermal_get_temp, 819 .get_mode = thermal_get_mode, 820 .set_mode = thermal_set_mode, 821 .get_trip_type = thermal_get_trip_type, 822 .get_trip_temp = thermal_get_trip_temp, 823 .get_crit_temp = thermal_get_crit_temp, 824 .notify = thermal_notify, 825 }; 826 827 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 828 { 829 int trips = 0; 830 int result; 831 acpi_status status; 832 int i; 833 834 if (tz->trips.critical.flags.valid) 835 trips++; 836 837 if (tz->trips.hot.flags.valid) 838 trips++; 839 840 if (tz->trips.passive.flags.valid) 841 trips++; 842 843 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 844 tz->trips.active[i].flags.valid; i++, trips++); 845 846 if (tz->trips.passive.flags.valid) 847 tz->thermal_zone = 848 thermal_zone_device_register("acpitz", trips, tz, 849 &acpi_thermal_zone_ops, 850 tz->trips.passive.tc1, 851 tz->trips.passive.tc2, 852 tz->trips.passive.tsp*100, 853 tz->polling_frequency*100); 854 else 855 tz->thermal_zone = 856 thermal_zone_device_register("acpitz", trips, tz, 857 &acpi_thermal_zone_ops, 858 0, 0, 0, 859 tz->polling_frequency*100); 860 if (IS_ERR(tz->thermal_zone)) 861 return -ENODEV; 862 863 result = sysfs_create_link(&tz->device->dev.kobj, 864 &tz->thermal_zone->device.kobj, "thermal_zone"); 865 if (result) 866 return result; 867 868 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 869 &tz->device->dev.kobj, "device"); 870 if (result) 871 return result; 872 873 status = acpi_attach_data(tz->device->handle, 874 acpi_bus_private_data_handler, 875 tz->thermal_zone); 876 if (ACPI_FAILURE(status)) { 877 printk(KERN_ERR PREFIX 878 "Error attaching device data\n"); 879 return -ENODEV; 880 } 881 882 tz->tz_enabled = 1; 883 884 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 885 tz->thermal_zone->id); 886 return 0; 887 } 888 889 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 890 { 891 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 892 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 893 thermal_zone_device_unregister(tz->thermal_zone); 894 tz->thermal_zone = NULL; 895 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 896 } 897 898 899 /* -------------------------------------------------------------------------- 900 Driver Interface 901 -------------------------------------------------------------------------- */ 902 903 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 904 { 905 struct acpi_thermal *tz = acpi_driver_data(device); 906 907 908 if (!tz) 909 return; 910 911 switch (event) { 912 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 913 acpi_thermal_check(tz); 914 break; 915 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 917 acpi_thermal_check(tz); 918 acpi_bus_generate_proc_event(device, event, 0); 919 acpi_bus_generate_netlink_event(device->pnp.device_class, 920 dev_name(&device->dev), event, 0); 921 break; 922 case ACPI_THERMAL_NOTIFY_DEVICES: 923 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 924 acpi_thermal_check(tz); 925 acpi_bus_generate_proc_event(device, event, 0); 926 acpi_bus_generate_netlink_event(device->pnp.device_class, 927 dev_name(&device->dev), event, 0); 928 break; 929 default: 930 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 931 "Unsupported event [0x%x]\n", event)); 932 break; 933 } 934 } 935 936 static int acpi_thermal_get_info(struct acpi_thermal *tz) 937 { 938 int result = 0; 939 940 941 if (!tz) 942 return -EINVAL; 943 944 /* Get temperature [_TMP] (required) */ 945 result = acpi_thermal_get_temperature(tz); 946 if (result) 947 return result; 948 949 /* Get trip points [_CRT, _PSV, etc.] (required) */ 950 result = acpi_thermal_get_trip_points(tz); 951 if (result) 952 return result; 953 954 /* Set the cooling mode [_SCP] to active cooling (default) */ 955 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 956 if (!result) 957 tz->flags.cooling_mode = 1; 958 959 /* Get default polling frequency [_TZP] (optional) */ 960 if (tzp) 961 tz->polling_frequency = tzp; 962 else 963 acpi_thermal_get_polling_frequency(tz); 964 965 return 0; 966 } 967 968 /* 969 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 970 * handles temperature values with a single decimal place. As a consequence, 971 * some implementations use an offset of 273.1 and others use an offset of 972 * 273.2. Try to find out which one is being used, to present the most 973 * accurate and visually appealing number. 974 * 975 * The heuristic below should work for all ACPI thermal zones which have a 976 * critical trip point with a value being a multiple of 0.5 degree Celsius. 977 */ 978 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 979 { 980 if (tz->trips.critical.flags.valid && 981 (tz->trips.critical.temperature % 5) == 1) 982 tz->kelvin_offset = 2731; 983 else 984 tz->kelvin_offset = 2732; 985 } 986 987 static int acpi_thermal_add(struct acpi_device *device) 988 { 989 int result = 0; 990 struct acpi_thermal *tz = NULL; 991 992 993 if (!device) 994 return -EINVAL; 995 996 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 997 if (!tz) 998 return -ENOMEM; 999 1000 tz->device = device; 1001 strcpy(tz->name, device->pnp.bus_id); 1002 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1003 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1004 device->driver_data = tz; 1005 mutex_init(&tz->lock); 1006 1007 1008 result = acpi_thermal_get_info(tz); 1009 if (result) 1010 goto free_memory; 1011 1012 acpi_thermal_guess_offset(tz); 1013 1014 result = acpi_thermal_register_thermal_zone(tz); 1015 if (result) 1016 goto free_memory; 1017 1018 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1019 acpi_device_name(device), acpi_device_bid(device), 1020 KELVIN_TO_CELSIUS(tz->temperature)); 1021 goto end; 1022 1023 free_memory: 1024 kfree(tz); 1025 end: 1026 return result; 1027 } 1028 1029 static int acpi_thermal_remove(struct acpi_device *device, int type) 1030 { 1031 struct acpi_thermal *tz = NULL; 1032 1033 if (!device || !acpi_driver_data(device)) 1034 return -EINVAL; 1035 1036 tz = acpi_driver_data(device); 1037 1038 acpi_thermal_unregister_thermal_zone(tz); 1039 mutex_destroy(&tz->lock); 1040 kfree(tz); 1041 return 0; 1042 } 1043 1044 static int acpi_thermal_resume(struct acpi_device *device) 1045 { 1046 struct acpi_thermal *tz = NULL; 1047 int i, j, power_state, result; 1048 1049 1050 if (!device || !acpi_driver_data(device)) 1051 return -EINVAL; 1052 1053 tz = acpi_driver_data(device); 1054 1055 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1056 if (!(&tz->trips.active[i])) 1057 break; 1058 if (!tz->trips.active[i].flags.valid) 1059 break; 1060 tz->trips.active[i].flags.enabled = 1; 1061 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1062 result = acpi_bus_update_power( 1063 tz->trips.active[i].devices.handles[j], 1064 &power_state); 1065 if (result || (power_state != ACPI_STATE_D0)) { 1066 tz->trips.active[i].flags.enabled = 0; 1067 break; 1068 } 1069 } 1070 tz->state.active |= tz->trips.active[i].flags.enabled; 1071 } 1072 1073 acpi_thermal_check(tz); 1074 1075 return AE_OK; 1076 } 1077 1078 static int thermal_act(const struct dmi_system_id *d) { 1079 1080 if (act == 0) { 1081 printk(KERN_NOTICE "ACPI: %s detected: " 1082 "disabling all active thermal trip points\n", d->ident); 1083 act = -1; 1084 } 1085 return 0; 1086 } 1087 static int thermal_nocrt(const struct dmi_system_id *d) { 1088 1089 printk(KERN_NOTICE "ACPI: %s detected: " 1090 "disabling all critical thermal trip point actions.\n", d->ident); 1091 nocrt = 1; 1092 return 0; 1093 } 1094 static int thermal_tzp(const struct dmi_system_id *d) { 1095 1096 if (tzp == 0) { 1097 printk(KERN_NOTICE "ACPI: %s detected: " 1098 "enabling thermal zone polling\n", d->ident); 1099 tzp = 300; /* 300 dS = 30 Seconds */ 1100 } 1101 return 0; 1102 } 1103 static int thermal_psv(const struct dmi_system_id *d) { 1104 1105 if (psv == 0) { 1106 printk(KERN_NOTICE "ACPI: %s detected: " 1107 "disabling all passive thermal trip points\n", d->ident); 1108 psv = -1; 1109 } 1110 return 0; 1111 } 1112 1113 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1114 /* 1115 * Award BIOS on this AOpen makes thermal control almost worthless. 1116 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1117 */ 1118 { 1119 .callback = thermal_act, 1120 .ident = "AOpen i915GMm-HFS", 1121 .matches = { 1122 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1123 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1124 }, 1125 }, 1126 { 1127 .callback = thermal_psv, 1128 .ident = "AOpen i915GMm-HFS", 1129 .matches = { 1130 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1131 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1132 }, 1133 }, 1134 { 1135 .callback = thermal_tzp, 1136 .ident = "AOpen i915GMm-HFS", 1137 .matches = { 1138 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1139 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1140 }, 1141 }, 1142 { 1143 .callback = thermal_nocrt, 1144 .ident = "Gigabyte GA-7ZX", 1145 .matches = { 1146 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1147 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1148 }, 1149 }, 1150 {} 1151 }; 1152 1153 static int __init acpi_thermal_init(void) 1154 { 1155 int result = 0; 1156 1157 dmi_check_system(thermal_dmi_table); 1158 1159 if (off) { 1160 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1161 return -ENODEV; 1162 } 1163 1164 result = acpi_bus_register_driver(&acpi_thermal_driver); 1165 if (result < 0) 1166 return -ENODEV; 1167 1168 return 0; 1169 } 1170 1171 static void __exit acpi_thermal_exit(void) 1172 { 1173 1174 acpi_bus_unregister_driver(&acpi_thermal_driver); 1175 1176 return; 1177 } 1178 1179 module_init(acpi_thermal_init); 1180 module_exit(acpi_thermal_exit); 1181