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 static int acpi_thermal_resume(struct device *dev); 110 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume); 111 112 static struct acpi_driver acpi_thermal_driver = { 113 .name = "thermal", 114 .class = ACPI_THERMAL_CLASS, 115 .ids = thermal_device_ids, 116 .ops = { 117 .add = acpi_thermal_add, 118 .remove = acpi_thermal_remove, 119 .notify = acpi_thermal_notify, 120 }, 121 .drv.pm = &acpi_thermal_pm, 122 }; 123 124 struct acpi_thermal_state { 125 u8 critical:1; 126 u8 hot:1; 127 u8 passive:1; 128 u8 active:1; 129 u8 reserved:4; 130 int active_index; 131 }; 132 133 struct acpi_thermal_state_flags { 134 u8 valid:1; 135 u8 enabled:1; 136 u8 reserved:6; 137 }; 138 139 struct acpi_thermal_critical { 140 struct acpi_thermal_state_flags flags; 141 unsigned long temperature; 142 }; 143 144 struct acpi_thermal_hot { 145 struct acpi_thermal_state_flags flags; 146 unsigned long temperature; 147 }; 148 149 struct acpi_thermal_passive { 150 struct acpi_thermal_state_flags flags; 151 unsigned long temperature; 152 unsigned long tc1; 153 unsigned long tc2; 154 unsigned long tsp; 155 struct acpi_handle_list devices; 156 }; 157 158 struct acpi_thermal_active { 159 struct acpi_thermal_state_flags flags; 160 unsigned long temperature; 161 struct acpi_handle_list devices; 162 }; 163 164 struct acpi_thermal_trips { 165 struct acpi_thermal_critical critical; 166 struct acpi_thermal_hot hot; 167 struct acpi_thermal_passive passive; 168 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 169 }; 170 171 struct acpi_thermal_flags { 172 u8 cooling_mode:1; /* _SCP */ 173 u8 devices:1; /* _TZD */ 174 u8 reserved:6; 175 }; 176 177 struct acpi_thermal { 178 struct acpi_device * device; 179 acpi_bus_id name; 180 unsigned long temperature; 181 unsigned long last_temperature; 182 unsigned long polling_frequency; 183 volatile u8 zombie; 184 struct acpi_thermal_flags flags; 185 struct acpi_thermal_state state; 186 struct acpi_thermal_trips trips; 187 struct acpi_handle_list devices; 188 struct thermal_zone_device *thermal_zone; 189 int tz_enabled; 190 int kelvin_offset; 191 struct mutex lock; 192 }; 193 194 /* -------------------------------------------------------------------------- 195 Thermal Zone Management 196 -------------------------------------------------------------------------- */ 197 198 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 199 { 200 acpi_status status = AE_OK; 201 unsigned long long tmp; 202 203 if (!tz) 204 return -EINVAL; 205 206 tz->last_temperature = tz->temperature; 207 208 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 209 if (ACPI_FAILURE(status)) 210 return -ENODEV; 211 212 tz->temperature = tmp; 213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 214 tz->temperature)); 215 216 return 0; 217 } 218 219 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 220 { 221 acpi_status status = AE_OK; 222 unsigned long long tmp; 223 224 if (!tz) 225 return -EINVAL; 226 227 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 228 if (ACPI_FAILURE(status)) 229 return -ENODEV; 230 231 tz->polling_frequency = tmp; 232 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 233 tz->polling_frequency)); 234 235 return 0; 236 } 237 238 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 239 { 240 acpi_status status = AE_OK; 241 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 242 struct acpi_object_list arg_list = { 1, &arg0 }; 243 acpi_handle handle = NULL; 244 245 246 if (!tz) 247 return -EINVAL; 248 249 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 250 if (ACPI_FAILURE(status)) { 251 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 252 return -ENODEV; 253 } 254 255 arg0.integer.value = mode; 256 257 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 258 if (ACPI_FAILURE(status)) 259 return -ENODEV; 260 261 return 0; 262 } 263 264 #define ACPI_TRIPS_CRITICAL 0x01 265 #define ACPI_TRIPS_HOT 0x02 266 #define ACPI_TRIPS_PASSIVE 0x04 267 #define ACPI_TRIPS_ACTIVE 0x08 268 #define ACPI_TRIPS_DEVICES 0x10 269 270 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 271 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 272 273 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 274 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 275 ACPI_TRIPS_DEVICES) 276 277 /* 278 * This exception is thrown out in two cases: 279 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 280 * when re-evaluating the AML code. 281 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 282 * We need to re-bind the cooling devices of a thermal zone when this occurs. 283 */ 284 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 285 do { \ 286 if (flags != ACPI_TRIPS_INIT) \ 287 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 288 "ACPI thermal trip point %s changed\n" \ 289 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 290 } while (0) 291 292 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 293 { 294 acpi_status status = AE_OK; 295 unsigned long long tmp; 296 struct acpi_handle_list devices; 297 int valid = 0; 298 int i; 299 300 /* Critical Shutdown */ 301 if (flag & ACPI_TRIPS_CRITICAL) { 302 status = acpi_evaluate_integer(tz->device->handle, 303 "_CRT", NULL, &tmp); 304 tz->trips.critical.temperature = tmp; 305 /* 306 * Treat freezing temperatures as invalid as well; some 307 * BIOSes return really low values and cause reboots at startup. 308 * Below zero (Celsius) values clearly aren't right for sure.. 309 * ... so lets discard those as invalid. 310 */ 311 if (ACPI_FAILURE(status)) { 312 tz->trips.critical.flags.valid = 0; 313 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 314 "No critical threshold\n")); 315 } else if (tmp <= 2732) { 316 printk(KERN_WARNING FW_BUG "Invalid critical threshold " 317 "(%llu)\n", tmp); 318 tz->trips.critical.flags.valid = 0; 319 } else { 320 tz->trips.critical.flags.valid = 1; 321 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 322 "Found critical threshold [%lu]\n", 323 tz->trips.critical.temperature)); 324 } 325 if (tz->trips.critical.flags.valid == 1) { 326 if (crt == -1) { 327 tz->trips.critical.flags.valid = 0; 328 } else if (crt > 0) { 329 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 330 /* 331 * Allow override critical threshold 332 */ 333 if (crt_k > tz->trips.critical.temperature) 334 printk(KERN_WARNING PREFIX 335 "Critical threshold %d C\n", crt); 336 tz->trips.critical.temperature = crt_k; 337 } 338 } 339 } 340 341 /* Critical Sleep (optional) */ 342 if (flag & ACPI_TRIPS_HOT) { 343 status = acpi_evaluate_integer(tz->device->handle, 344 "_HOT", NULL, &tmp); 345 if (ACPI_FAILURE(status)) { 346 tz->trips.hot.flags.valid = 0; 347 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 348 "No hot threshold\n")); 349 } else { 350 tz->trips.hot.temperature = tmp; 351 tz->trips.hot.flags.valid = 1; 352 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 353 "Found hot threshold [%lu]\n", 354 tz->trips.critical.temperature)); 355 } 356 } 357 358 /* Passive (optional) */ 359 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 360 (flag == ACPI_TRIPS_INIT)) { 361 valid = tz->trips.passive.flags.valid; 362 if (psv == -1) { 363 status = AE_SUPPORT; 364 } else if (psv > 0) { 365 tmp = CELSIUS_TO_KELVIN(psv); 366 status = AE_OK; 367 } else { 368 status = acpi_evaluate_integer(tz->device->handle, 369 "_PSV", NULL, &tmp); 370 } 371 372 if (ACPI_FAILURE(status)) 373 tz->trips.passive.flags.valid = 0; 374 else { 375 tz->trips.passive.temperature = tmp; 376 tz->trips.passive.flags.valid = 1; 377 if (flag == ACPI_TRIPS_INIT) { 378 status = acpi_evaluate_integer( 379 tz->device->handle, "_TC1", 380 NULL, &tmp); 381 if (ACPI_FAILURE(status)) 382 tz->trips.passive.flags.valid = 0; 383 else 384 tz->trips.passive.tc1 = tmp; 385 status = acpi_evaluate_integer( 386 tz->device->handle, "_TC2", 387 NULL, &tmp); 388 if (ACPI_FAILURE(status)) 389 tz->trips.passive.flags.valid = 0; 390 else 391 tz->trips.passive.tc2 = tmp; 392 status = acpi_evaluate_integer( 393 tz->device->handle, "_TSP", 394 NULL, &tmp); 395 if (ACPI_FAILURE(status)) 396 tz->trips.passive.flags.valid = 0; 397 else 398 tz->trips.passive.tsp = tmp; 399 } 400 } 401 } 402 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 403 memset(&devices, 0, sizeof(struct acpi_handle_list)); 404 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 405 NULL, &devices); 406 if (ACPI_FAILURE(status)) { 407 printk(KERN_WARNING PREFIX 408 "Invalid passive threshold\n"); 409 tz->trips.passive.flags.valid = 0; 410 } 411 else 412 tz->trips.passive.flags.valid = 1; 413 414 if (memcmp(&tz->trips.passive.devices, &devices, 415 sizeof(struct acpi_handle_list))) { 416 memcpy(&tz->trips.passive.devices, &devices, 417 sizeof(struct acpi_handle_list)); 418 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 419 } 420 } 421 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 422 if (valid != tz->trips.passive.flags.valid) 423 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 424 } 425 426 /* Active (optional) */ 427 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 428 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 429 valid = tz->trips.active[i].flags.valid; 430 431 if (act == -1) 432 break; /* disable all active trip points */ 433 434 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 435 tz->trips.active[i].flags.valid)) { 436 status = acpi_evaluate_integer(tz->device->handle, 437 name, NULL, &tmp); 438 if (ACPI_FAILURE(status)) { 439 tz->trips.active[i].flags.valid = 0; 440 if (i == 0) 441 break; 442 if (act <= 0) 443 break; 444 if (i == 1) 445 tz->trips.active[0].temperature = 446 CELSIUS_TO_KELVIN(act); 447 else 448 /* 449 * Don't allow override higher than 450 * the next higher trip point 451 */ 452 tz->trips.active[i - 1].temperature = 453 (tz->trips.active[i - 2].temperature < 454 CELSIUS_TO_KELVIN(act) ? 455 tz->trips.active[i - 2].temperature : 456 CELSIUS_TO_KELVIN(act)); 457 break; 458 } else { 459 tz->trips.active[i].temperature = tmp; 460 tz->trips.active[i].flags.valid = 1; 461 } 462 } 463 464 name[2] = 'L'; 465 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 466 memset(&devices, 0, sizeof(struct acpi_handle_list)); 467 status = acpi_evaluate_reference(tz->device->handle, 468 name, NULL, &devices); 469 if (ACPI_FAILURE(status)) { 470 printk(KERN_WARNING PREFIX 471 "Invalid active%d threshold\n", i); 472 tz->trips.active[i].flags.valid = 0; 473 } 474 else 475 tz->trips.active[i].flags.valid = 1; 476 477 if (memcmp(&tz->trips.active[i].devices, &devices, 478 sizeof(struct acpi_handle_list))) { 479 memcpy(&tz->trips.active[i].devices, &devices, 480 sizeof(struct acpi_handle_list)); 481 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 482 } 483 } 484 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 485 if (valid != tz->trips.active[i].flags.valid) 486 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 487 488 if (!tz->trips.active[i].flags.valid) 489 break; 490 } 491 492 if (flag & ACPI_TRIPS_DEVICES) { 493 memset(&devices, 0, sizeof(struct acpi_handle_list)); 494 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 495 NULL, &devices); 496 if (memcmp(&tz->devices, &devices, 497 sizeof(struct acpi_handle_list))) { 498 memcpy(&tz->devices, &devices, 499 sizeof(struct acpi_handle_list)); 500 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 501 } 502 } 503 504 return 0; 505 } 506 507 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 508 { 509 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 510 511 if (ret) 512 return ret; 513 514 valid = tz->trips.critical.flags.valid | 515 tz->trips.hot.flags.valid | 516 tz->trips.passive.flags.valid; 517 518 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 519 valid |= tz->trips.active[i].flags.valid; 520 521 if (!valid) { 522 printk(KERN_WARNING FW_BUG "No valid trip found\n"); 523 return -ENODEV; 524 } 525 return 0; 526 } 527 528 static void acpi_thermal_check(void *data) 529 { 530 struct acpi_thermal *tz = data; 531 532 thermal_zone_device_update(tz->thermal_zone); 533 } 534 535 /* sys I/F for generic thermal sysfs support */ 536 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 537 538 static int thermal_get_temp(struct thermal_zone_device *thermal, 539 unsigned long *temp) 540 { 541 struct acpi_thermal *tz = thermal->devdata; 542 int result; 543 544 if (!tz) 545 return -EINVAL; 546 547 result = acpi_thermal_get_temperature(tz); 548 if (result) 549 return result; 550 551 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 552 return 0; 553 } 554 555 static const char enabled[] = "kernel"; 556 static const char disabled[] = "user"; 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 ACPI thermal control\n", 594 tz->tz_enabled ? enabled : disabled)); 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_notify(struct thermal_zone_device *thermal, int trip, 712 enum thermal_trip_type trip_type) 713 { 714 u8 type = 0; 715 struct acpi_thermal *tz = thermal->devdata; 716 717 if (trip_type == THERMAL_TRIP_CRITICAL) 718 type = ACPI_THERMAL_NOTIFY_CRITICAL; 719 else if (trip_type == THERMAL_TRIP_HOT) 720 type = ACPI_THERMAL_NOTIFY_HOT; 721 else 722 return 0; 723 724 acpi_bus_generate_proc_event(tz->device, type, 1); 725 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 726 dev_name(&tz->device->dev), type, 1); 727 728 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 729 return 1; 730 731 return 0; 732 } 733 734 typedef int (*cb)(struct thermal_zone_device *, int, 735 struct thermal_cooling_device *); 736 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 737 struct thermal_cooling_device *cdev, 738 cb action) 739 { 740 struct acpi_device *device = cdev->devdata; 741 struct acpi_thermal *tz = thermal->devdata; 742 struct acpi_device *dev; 743 acpi_status status; 744 acpi_handle handle; 745 int i; 746 int j; 747 int trip = -1; 748 int result = 0; 749 750 if (tz->trips.critical.flags.valid) 751 trip++; 752 753 if (tz->trips.hot.flags.valid) 754 trip++; 755 756 if (tz->trips.passive.flags.valid) { 757 trip++; 758 for (i = 0; i < tz->trips.passive.devices.count; 759 i++) { 760 handle = tz->trips.passive.devices.handles[i]; 761 status = acpi_bus_get_device(handle, &dev); 762 if (ACPI_SUCCESS(status) && (dev == device)) { 763 result = action(thermal, trip, cdev); 764 if (result) 765 goto failed; 766 } 767 } 768 } 769 770 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 771 if (!tz->trips.active[i].flags.valid) 772 break; 773 trip++; 774 for (j = 0; 775 j < tz->trips.active[i].devices.count; 776 j++) { 777 handle = tz->trips.active[i].devices.handles[j]; 778 status = acpi_bus_get_device(handle, &dev); 779 if (ACPI_SUCCESS(status) && (dev == device)) { 780 result = action(thermal, trip, cdev); 781 if (result) 782 goto failed; 783 } 784 } 785 } 786 787 for (i = 0; i < tz->devices.count; i++) { 788 handle = tz->devices.handles[i]; 789 status = acpi_bus_get_device(handle, &dev); 790 if (ACPI_SUCCESS(status) && (dev == device)) { 791 result = action(thermal, -1, cdev); 792 if (result) 793 goto failed; 794 } 795 } 796 797 failed: 798 return result; 799 } 800 801 static int 802 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 803 struct thermal_cooling_device *cdev) 804 { 805 return acpi_thermal_cooling_device_cb(thermal, cdev, 806 thermal_zone_bind_cooling_device); 807 } 808 809 static int 810 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 811 struct thermal_cooling_device *cdev) 812 { 813 return acpi_thermal_cooling_device_cb(thermal, cdev, 814 thermal_zone_unbind_cooling_device); 815 } 816 817 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = { 818 .bind = acpi_thermal_bind_cooling_device, 819 .unbind = acpi_thermal_unbind_cooling_device, 820 .get_temp = thermal_get_temp, 821 .get_mode = thermal_get_mode, 822 .set_mode = thermal_set_mode, 823 .get_trip_type = thermal_get_trip_type, 824 .get_trip_temp = thermal_get_trip_temp, 825 .get_crit_temp = thermal_get_crit_temp, 826 .notify = thermal_notify, 827 }; 828 829 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 830 { 831 int trips = 0; 832 int result; 833 acpi_status status; 834 int i; 835 836 if (tz->trips.critical.flags.valid) 837 trips++; 838 839 if (tz->trips.hot.flags.valid) 840 trips++; 841 842 if (tz->trips.passive.flags.valid) 843 trips++; 844 845 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 846 tz->trips.active[i].flags.valid; i++, trips++); 847 848 if (tz->trips.passive.flags.valid) 849 tz->thermal_zone = 850 thermal_zone_device_register("acpitz", trips, tz, 851 &acpi_thermal_zone_ops, 852 tz->trips.passive.tc1, 853 tz->trips.passive.tc2, 854 tz->trips.passive.tsp*100, 855 tz->polling_frequency*100); 856 else 857 tz->thermal_zone = 858 thermal_zone_device_register("acpitz", trips, tz, 859 &acpi_thermal_zone_ops, 860 0, 0, 0, 861 tz->polling_frequency*100); 862 if (IS_ERR(tz->thermal_zone)) 863 return -ENODEV; 864 865 result = sysfs_create_link(&tz->device->dev.kobj, 866 &tz->thermal_zone->device.kobj, "thermal_zone"); 867 if (result) 868 return result; 869 870 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 871 &tz->device->dev.kobj, "device"); 872 if (result) 873 return result; 874 875 status = acpi_attach_data(tz->device->handle, 876 acpi_bus_private_data_handler, 877 tz->thermal_zone); 878 if (ACPI_FAILURE(status)) { 879 printk(KERN_ERR PREFIX 880 "Error attaching device data\n"); 881 return -ENODEV; 882 } 883 884 tz->tz_enabled = 1; 885 886 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 887 tz->thermal_zone->id); 888 return 0; 889 } 890 891 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 892 { 893 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 894 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 895 thermal_zone_device_unregister(tz->thermal_zone); 896 tz->thermal_zone = NULL; 897 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 898 } 899 900 901 /* -------------------------------------------------------------------------- 902 Driver Interface 903 -------------------------------------------------------------------------- */ 904 905 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 906 { 907 struct acpi_thermal *tz = acpi_driver_data(device); 908 909 910 if (!tz) 911 return; 912 913 switch (event) { 914 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 915 acpi_thermal_check(tz); 916 break; 917 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 918 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 919 acpi_thermal_check(tz); 920 acpi_bus_generate_proc_event(device, event, 0); 921 acpi_bus_generate_netlink_event(device->pnp.device_class, 922 dev_name(&device->dev), event, 0); 923 break; 924 case ACPI_THERMAL_NOTIFY_DEVICES: 925 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 926 acpi_thermal_check(tz); 927 acpi_bus_generate_proc_event(device, event, 0); 928 acpi_bus_generate_netlink_event(device->pnp.device_class, 929 dev_name(&device->dev), event, 0); 930 break; 931 default: 932 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 933 "Unsupported event [0x%x]\n", event)); 934 break; 935 } 936 } 937 938 static int acpi_thermal_get_info(struct acpi_thermal *tz) 939 { 940 int result = 0; 941 942 943 if (!tz) 944 return -EINVAL; 945 946 /* Get trip points [_CRT, _PSV, etc.] (required) */ 947 result = acpi_thermal_get_trip_points(tz); 948 if (result) 949 return result; 950 951 /* Get temperature [_TMP] (required) */ 952 result = acpi_thermal_get_temperature(tz); 953 if (result) 954 return result; 955 956 /* Set the cooling mode [_SCP] to active cooling (default) */ 957 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 958 if (!result) 959 tz->flags.cooling_mode = 1; 960 961 /* Get default polling frequency [_TZP] (optional) */ 962 if (tzp) 963 tz->polling_frequency = tzp; 964 else 965 acpi_thermal_get_polling_frequency(tz); 966 967 return 0; 968 } 969 970 /* 971 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 972 * handles temperature values with a single decimal place. As a consequence, 973 * some implementations use an offset of 273.1 and others use an offset of 974 * 273.2. Try to find out which one is being used, to present the most 975 * accurate and visually appealing number. 976 * 977 * The heuristic below should work for all ACPI thermal zones which have a 978 * critical trip point with a value being a multiple of 0.5 degree Celsius. 979 */ 980 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 981 { 982 if (tz->trips.critical.flags.valid && 983 (tz->trips.critical.temperature % 5) == 1) 984 tz->kelvin_offset = 2731; 985 else 986 tz->kelvin_offset = 2732; 987 } 988 989 static int acpi_thermal_add(struct acpi_device *device) 990 { 991 int result = 0; 992 struct acpi_thermal *tz = NULL; 993 994 995 if (!device) 996 return -EINVAL; 997 998 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 999 if (!tz) 1000 return -ENOMEM; 1001 1002 tz->device = device; 1003 strcpy(tz->name, device->pnp.bus_id); 1004 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1005 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1006 device->driver_data = tz; 1007 mutex_init(&tz->lock); 1008 1009 1010 result = acpi_thermal_get_info(tz); 1011 if (result) 1012 goto free_memory; 1013 1014 acpi_thermal_guess_offset(tz); 1015 1016 result = acpi_thermal_register_thermal_zone(tz); 1017 if (result) 1018 goto free_memory; 1019 1020 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1021 acpi_device_name(device), acpi_device_bid(device), 1022 KELVIN_TO_CELSIUS(tz->temperature)); 1023 goto end; 1024 1025 free_memory: 1026 kfree(tz); 1027 end: 1028 return result; 1029 } 1030 1031 static int acpi_thermal_remove(struct acpi_device *device, int type) 1032 { 1033 struct acpi_thermal *tz = NULL; 1034 1035 if (!device || !acpi_driver_data(device)) 1036 return -EINVAL; 1037 1038 tz = acpi_driver_data(device); 1039 1040 acpi_thermal_unregister_thermal_zone(tz); 1041 mutex_destroy(&tz->lock); 1042 kfree(tz); 1043 return 0; 1044 } 1045 1046 static int acpi_thermal_resume(struct device *dev) 1047 { 1048 struct acpi_thermal *tz; 1049 int i, j, power_state, result; 1050 1051 if (!dev) 1052 return -EINVAL; 1053 1054 tz = acpi_driver_data(to_acpi_device(dev)); 1055 if (!tz) 1056 return -EINVAL; 1057 1058 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1059 if (!(&tz->trips.active[i])) 1060 break; 1061 if (!tz->trips.active[i].flags.valid) 1062 break; 1063 tz->trips.active[i].flags.enabled = 1; 1064 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1065 result = acpi_bus_update_power( 1066 tz->trips.active[i].devices.handles[j], 1067 &power_state); 1068 if (result || (power_state != ACPI_STATE_D0)) { 1069 tz->trips.active[i].flags.enabled = 0; 1070 break; 1071 } 1072 } 1073 tz->state.active |= tz->trips.active[i].flags.enabled; 1074 } 1075 1076 acpi_thermal_check(tz); 1077 1078 return AE_OK; 1079 } 1080 1081 static int thermal_act(const struct dmi_system_id *d) { 1082 1083 if (act == 0) { 1084 printk(KERN_NOTICE "ACPI: %s detected: " 1085 "disabling all active thermal trip points\n", d->ident); 1086 act = -1; 1087 } 1088 return 0; 1089 } 1090 static int thermal_nocrt(const struct dmi_system_id *d) { 1091 1092 printk(KERN_NOTICE "ACPI: %s detected: " 1093 "disabling all critical thermal trip point actions.\n", d->ident); 1094 nocrt = 1; 1095 return 0; 1096 } 1097 static int thermal_tzp(const struct dmi_system_id *d) { 1098 1099 if (tzp == 0) { 1100 printk(KERN_NOTICE "ACPI: %s detected: " 1101 "enabling thermal zone polling\n", d->ident); 1102 tzp = 300; /* 300 dS = 30 Seconds */ 1103 } 1104 return 0; 1105 } 1106 static int thermal_psv(const struct dmi_system_id *d) { 1107 1108 if (psv == 0) { 1109 printk(KERN_NOTICE "ACPI: %s detected: " 1110 "disabling all passive thermal trip points\n", d->ident); 1111 psv = -1; 1112 } 1113 return 0; 1114 } 1115 1116 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1117 /* 1118 * Award BIOS on this AOpen makes thermal control almost worthless. 1119 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1120 */ 1121 { 1122 .callback = thermal_act, 1123 .ident = "AOpen i915GMm-HFS", 1124 .matches = { 1125 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1126 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1127 }, 1128 }, 1129 { 1130 .callback = thermal_psv, 1131 .ident = "AOpen i915GMm-HFS", 1132 .matches = { 1133 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1134 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1135 }, 1136 }, 1137 { 1138 .callback = thermal_tzp, 1139 .ident = "AOpen i915GMm-HFS", 1140 .matches = { 1141 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1142 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1143 }, 1144 }, 1145 { 1146 .callback = thermal_nocrt, 1147 .ident = "Gigabyte GA-7ZX", 1148 .matches = { 1149 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1150 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1151 }, 1152 }, 1153 {} 1154 }; 1155 1156 static int __init acpi_thermal_init(void) 1157 { 1158 int result = 0; 1159 1160 dmi_check_system(thermal_dmi_table); 1161 1162 if (off) { 1163 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1164 return -ENODEV; 1165 } 1166 1167 result = acpi_bus_register_driver(&acpi_thermal_driver); 1168 if (result < 0) 1169 return -ENODEV; 1170 1171 return 0; 1172 } 1173 1174 static void __exit acpi_thermal_exit(void) 1175 { 1176 1177 acpi_bus_unregister_driver(&acpi_thermal_driver); 1178 1179 return; 1180 } 1181 1182 module_init(acpi_thermal_init); 1183 module_exit(acpi_thermal_exit); 1184