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 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 kernel ACPI thermal control\n", 592 tz->tz_enabled ? "Enable" : "Disable")); 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 const 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, 0, 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, 0, 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 trip points [_CRT, _PSV, etc.] (required) */ 945 result = acpi_thermal_get_trip_points(tz); 946 if (result) 947 return result; 948 949 /* Get temperature [_TMP] (required) */ 950 result = acpi_thermal_get_temperature(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 device *dev) 1045 { 1046 struct acpi_thermal *tz; 1047 int i, j, power_state, result; 1048 1049 if (!dev) 1050 return -EINVAL; 1051 1052 tz = acpi_driver_data(to_acpi_device(dev)); 1053 if (!tz) 1054 return -EINVAL; 1055 1056 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1057 if (!(&tz->trips.active[i])) 1058 break; 1059 if (!tz->trips.active[i].flags.valid) 1060 break; 1061 tz->trips.active[i].flags.enabled = 1; 1062 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1063 result = acpi_bus_update_power( 1064 tz->trips.active[i].devices.handles[j], 1065 &power_state); 1066 if (result || (power_state != ACPI_STATE_D0)) { 1067 tz->trips.active[i].flags.enabled = 0; 1068 break; 1069 } 1070 } 1071 tz->state.active |= tz->trips.active[i].flags.enabled; 1072 } 1073 1074 acpi_thermal_check(tz); 1075 1076 return AE_OK; 1077 } 1078 1079 static int thermal_act(const struct dmi_system_id *d) { 1080 1081 if (act == 0) { 1082 printk(KERN_NOTICE "ACPI: %s detected: " 1083 "disabling all active thermal trip points\n", d->ident); 1084 act = -1; 1085 } 1086 return 0; 1087 } 1088 static int thermal_nocrt(const struct dmi_system_id *d) { 1089 1090 printk(KERN_NOTICE "ACPI: %s detected: " 1091 "disabling all critical thermal trip point actions.\n", d->ident); 1092 nocrt = 1; 1093 return 0; 1094 } 1095 static int thermal_tzp(const struct dmi_system_id *d) { 1096 1097 if (tzp == 0) { 1098 printk(KERN_NOTICE "ACPI: %s detected: " 1099 "enabling thermal zone polling\n", d->ident); 1100 tzp = 300; /* 300 dS = 30 Seconds */ 1101 } 1102 return 0; 1103 } 1104 static int thermal_psv(const struct dmi_system_id *d) { 1105 1106 if (psv == 0) { 1107 printk(KERN_NOTICE "ACPI: %s detected: " 1108 "disabling all passive thermal trip points\n", d->ident); 1109 psv = -1; 1110 } 1111 return 0; 1112 } 1113 1114 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1115 /* 1116 * Award BIOS on this AOpen makes thermal control almost worthless. 1117 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1118 */ 1119 { 1120 .callback = thermal_act, 1121 .ident = "AOpen i915GMm-HFS", 1122 .matches = { 1123 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1124 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1125 }, 1126 }, 1127 { 1128 .callback = thermal_psv, 1129 .ident = "AOpen i915GMm-HFS", 1130 .matches = { 1131 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1132 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1133 }, 1134 }, 1135 { 1136 .callback = thermal_tzp, 1137 .ident = "AOpen i915GMm-HFS", 1138 .matches = { 1139 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1140 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1141 }, 1142 }, 1143 { 1144 .callback = thermal_nocrt, 1145 .ident = "Gigabyte GA-7ZX", 1146 .matches = { 1147 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1148 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1149 }, 1150 }, 1151 {} 1152 }; 1153 1154 static int __init acpi_thermal_init(void) 1155 { 1156 int result = 0; 1157 1158 dmi_check_system(thermal_dmi_table); 1159 1160 if (off) { 1161 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1162 return -ENODEV; 1163 } 1164 1165 result = acpi_bus_register_driver(&acpi_thermal_driver); 1166 if (result < 0) 1167 return -ENODEV; 1168 1169 return 0; 1170 } 1171 1172 static void __exit acpi_thermal_exit(void) 1173 { 1174 1175 acpi_bus_unregister_driver(&acpi_thermal_driver); 1176 1177 return; 1178 } 1179 1180 module_init(acpi_thermal_init); 1181 module_exit(acpi_thermal_exit); 1182