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/proc_fs.h> 41 #include <linux/jiffies.h> 42 #include <linux/kmod.h> 43 #include <linux/seq_file.h> 44 #include <linux/reboot.h> 45 #include <linux/device.h> 46 #include <asm/uaccess.h> 47 #include <linux/thermal.h> 48 #include <acpi/acpi_bus.h> 49 #include <acpi/acpi_drivers.h> 50 51 #define PREFIX "ACPI: " 52 53 #define ACPI_THERMAL_CLASS "thermal_zone" 54 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" 55 #define ACPI_THERMAL_FILE_STATE "state" 56 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" 57 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" 58 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" 59 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" 60 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 61 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 62 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 63 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 64 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 65 #define ACPI_THERMAL_MODE_ACTIVE 0x00 66 67 #define ACPI_THERMAL_MAX_ACTIVE 10 68 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 69 70 #define _COMPONENT ACPI_THERMAL_COMPONENT 71 ACPI_MODULE_NAME("thermal"); 72 73 MODULE_AUTHOR("Paul Diefenbaugh"); 74 MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); 75 MODULE_LICENSE("GPL"); 76 77 static int act; 78 module_param(act, int, 0644); 79 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); 80 81 static int crt; 82 module_param(crt, int, 0644); 83 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); 84 85 static int tzp; 86 module_param(tzp, int, 0444); 87 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); 88 89 static int nocrt; 90 module_param(nocrt, int, 0); 91 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 92 93 static int off; 94 module_param(off, int, 0); 95 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); 96 97 static int psv; 98 module_param(psv, int, 0644); 99 MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); 100 101 static int acpi_thermal_add(struct acpi_device *device); 102 static int acpi_thermal_remove(struct acpi_device *device, int type); 103 static int acpi_thermal_resume(struct acpi_device *device); 104 static void acpi_thermal_notify(struct acpi_device *device, u32 event); 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *, 110 const char __user *, size_t, 111 loff_t *); 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, 114 size_t, loff_t *); 115 116 static const struct acpi_device_id thermal_device_ids[] = { 117 {ACPI_THERMAL_HID, 0}, 118 {"", 0}, 119 }; 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids); 121 122 static struct acpi_driver acpi_thermal_driver = { 123 .name = "thermal", 124 .class = ACPI_THERMAL_CLASS, 125 .ids = thermal_device_ids, 126 .ops = { 127 .add = acpi_thermal_add, 128 .remove = acpi_thermal_remove, 129 .resume = acpi_thermal_resume, 130 .notify = acpi_thermal_notify, 131 }, 132 }; 133 134 struct acpi_thermal_state { 135 u8 critical:1; 136 u8 hot:1; 137 u8 passive:1; 138 u8 active:1; 139 u8 reserved:4; 140 int active_index; 141 }; 142 143 struct acpi_thermal_state_flags { 144 u8 valid:1; 145 u8 enabled:1; 146 u8 reserved:6; 147 }; 148 149 struct acpi_thermal_critical { 150 struct acpi_thermal_state_flags flags; 151 unsigned long temperature; 152 }; 153 154 struct acpi_thermal_hot { 155 struct acpi_thermal_state_flags flags; 156 unsigned long temperature; 157 }; 158 159 struct acpi_thermal_passive { 160 struct acpi_thermal_state_flags flags; 161 unsigned long temperature; 162 unsigned long tc1; 163 unsigned long tc2; 164 unsigned long tsp; 165 struct acpi_handle_list devices; 166 }; 167 168 struct acpi_thermal_active { 169 struct acpi_thermal_state_flags flags; 170 unsigned long temperature; 171 struct acpi_handle_list devices; 172 }; 173 174 struct acpi_thermal_trips { 175 struct acpi_thermal_critical critical; 176 struct acpi_thermal_hot hot; 177 struct acpi_thermal_passive passive; 178 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; 179 }; 180 181 struct acpi_thermal_flags { 182 u8 cooling_mode:1; /* _SCP */ 183 u8 devices:1; /* _TZD */ 184 u8 reserved:6; 185 }; 186 187 struct acpi_thermal { 188 struct acpi_device * device; 189 acpi_bus_id name; 190 unsigned long temperature; 191 unsigned long last_temperature; 192 unsigned long polling_frequency; 193 volatile u8 zombie; 194 struct acpi_thermal_flags flags; 195 struct acpi_thermal_state state; 196 struct acpi_thermal_trips trips; 197 struct acpi_handle_list devices; 198 struct thermal_zone_device *thermal_zone; 199 int tz_enabled; 200 int kelvin_offset; 201 struct mutex lock; 202 }; 203 204 static const struct file_operations acpi_thermal_state_fops = { 205 .owner = THIS_MODULE, 206 .open = acpi_thermal_state_open_fs, 207 .read = seq_read, 208 .llseek = seq_lseek, 209 .release = single_release, 210 }; 211 212 static const struct file_operations acpi_thermal_temp_fops = { 213 .owner = THIS_MODULE, 214 .open = acpi_thermal_temp_open_fs, 215 .read = seq_read, 216 .llseek = seq_lseek, 217 .release = single_release, 218 }; 219 220 static const struct file_operations acpi_thermal_trip_fops = { 221 .owner = THIS_MODULE, 222 .open = acpi_thermal_trip_open_fs, 223 .read = seq_read, 224 .llseek = seq_lseek, 225 .release = single_release, 226 }; 227 228 static const struct file_operations acpi_thermal_cooling_fops = { 229 .owner = THIS_MODULE, 230 .open = acpi_thermal_cooling_open_fs, 231 .read = seq_read, 232 .write = acpi_thermal_write_cooling_mode, 233 .llseek = seq_lseek, 234 .release = single_release, 235 }; 236 237 static const struct file_operations acpi_thermal_polling_fops = { 238 .owner = THIS_MODULE, 239 .open = acpi_thermal_polling_open_fs, 240 .read = seq_read, 241 .write = acpi_thermal_write_polling, 242 .llseek = seq_lseek, 243 .release = single_release, 244 }; 245 246 /* -------------------------------------------------------------------------- 247 Thermal Zone Management 248 -------------------------------------------------------------------------- */ 249 250 static int acpi_thermal_get_temperature(struct acpi_thermal *tz) 251 { 252 acpi_status status = AE_OK; 253 unsigned long long tmp; 254 255 if (!tz) 256 return -EINVAL; 257 258 tz->last_temperature = tz->temperature; 259 260 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); 261 if (ACPI_FAILURE(status)) 262 return -ENODEV; 263 264 tz->temperature = tmp; 265 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", 266 tz->temperature)); 267 268 return 0; 269 } 270 271 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) 272 { 273 acpi_status status = AE_OK; 274 unsigned long long tmp; 275 276 if (!tz) 277 return -EINVAL; 278 279 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); 280 if (ACPI_FAILURE(status)) 281 return -ENODEV; 282 283 tz->polling_frequency = tmp; 284 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", 285 tz->polling_frequency)); 286 287 return 0; 288 } 289 290 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds) 291 { 292 293 if (!tz) 294 return -EINVAL; 295 296 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ 297 298 tz->thermal_zone->polling_delay = seconds * 1000; 299 300 if (tz->tz_enabled) 301 thermal_zone_device_update(tz->thermal_zone); 302 303 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 304 "Polling frequency set to %lu seconds\n", 305 tz->polling_frequency/10)); 306 307 return 0; 308 } 309 310 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) 311 { 312 acpi_status status = AE_OK; 313 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 314 struct acpi_object_list arg_list = { 1, &arg0 }; 315 acpi_handle handle = NULL; 316 317 318 if (!tz) 319 return -EINVAL; 320 321 status = acpi_get_handle(tz->device->handle, "_SCP", &handle); 322 if (ACPI_FAILURE(status)) { 323 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); 324 return -ENODEV; 325 } 326 327 arg0.integer.value = mode; 328 329 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); 330 if (ACPI_FAILURE(status)) 331 return -ENODEV; 332 333 return 0; 334 } 335 336 #define ACPI_TRIPS_CRITICAL 0x01 337 #define ACPI_TRIPS_HOT 0x02 338 #define ACPI_TRIPS_PASSIVE 0x04 339 #define ACPI_TRIPS_ACTIVE 0x08 340 #define ACPI_TRIPS_DEVICES 0x10 341 342 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) 343 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES 344 345 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ 346 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ 347 ACPI_TRIPS_DEVICES) 348 349 /* 350 * This exception is thrown out in two cases: 351 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid 352 * when re-evaluating the AML code. 353 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. 354 * We need to re-bind the cooling devices of a thermal zone when this occurs. 355 */ 356 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \ 357 do { \ 358 if (flags != ACPI_TRIPS_INIT) \ 359 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ 360 "ACPI thermal trip point %s changed\n" \ 361 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \ 362 } while (0) 363 364 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) 365 { 366 acpi_status status = AE_OK; 367 unsigned long long tmp; 368 struct acpi_handle_list devices; 369 int valid = 0; 370 int i; 371 372 /* Critical Shutdown */ 373 if (flag & ACPI_TRIPS_CRITICAL) { 374 status = acpi_evaluate_integer(tz->device->handle, 375 "_CRT", NULL, &tmp); 376 tz->trips.critical.temperature = tmp; 377 /* 378 * Treat freezing temperatures as invalid as well; some 379 * BIOSes return really low values and cause reboots at startup. 380 * Below zero (Celsius) values clearly aren't right for sure.. 381 * ... so lets discard those as invalid. 382 */ 383 if (ACPI_FAILURE(status)) { 384 tz->trips.critical.flags.valid = 0; 385 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 386 "No critical threshold\n")); 387 } else if (tmp <= 2732) { 388 printk(KERN_WARNING FW_BUG "Invalid critical threshold " 389 "(%llu)\n", tmp); 390 tz->trips.critical.flags.valid = 0; 391 } else { 392 tz->trips.critical.flags.valid = 1; 393 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 394 "Found critical threshold [%lu]\n", 395 tz->trips.critical.temperature)); 396 } 397 if (tz->trips.critical.flags.valid == 1) { 398 if (crt == -1) { 399 tz->trips.critical.flags.valid = 0; 400 } else if (crt > 0) { 401 unsigned long crt_k = CELSIUS_TO_KELVIN(crt); 402 /* 403 * Allow override critical threshold 404 */ 405 if (crt_k > tz->trips.critical.temperature) 406 printk(KERN_WARNING PREFIX 407 "Critical threshold %d C\n", crt); 408 tz->trips.critical.temperature = crt_k; 409 } 410 } 411 } 412 413 /* Critical Sleep (optional) */ 414 if (flag & ACPI_TRIPS_HOT) { 415 status = acpi_evaluate_integer(tz->device->handle, 416 "_HOT", NULL, &tmp); 417 if (ACPI_FAILURE(status)) { 418 tz->trips.hot.flags.valid = 0; 419 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 420 "No hot threshold\n")); 421 } else { 422 tz->trips.hot.temperature = tmp; 423 tz->trips.hot.flags.valid = 1; 424 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 425 "Found hot threshold [%lu]\n", 426 tz->trips.critical.temperature)); 427 } 428 } 429 430 /* Passive (optional) */ 431 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || 432 (flag == ACPI_TRIPS_INIT)) { 433 valid = tz->trips.passive.flags.valid; 434 if (psv == -1) { 435 status = AE_SUPPORT; 436 } else if (psv > 0) { 437 tmp = CELSIUS_TO_KELVIN(psv); 438 status = AE_OK; 439 } else { 440 status = acpi_evaluate_integer(tz->device->handle, 441 "_PSV", NULL, &tmp); 442 } 443 444 if (ACPI_FAILURE(status)) 445 tz->trips.passive.flags.valid = 0; 446 else { 447 tz->trips.passive.temperature = tmp; 448 tz->trips.passive.flags.valid = 1; 449 if (flag == ACPI_TRIPS_INIT) { 450 status = acpi_evaluate_integer( 451 tz->device->handle, "_TC1", 452 NULL, &tmp); 453 if (ACPI_FAILURE(status)) 454 tz->trips.passive.flags.valid = 0; 455 else 456 tz->trips.passive.tc1 = tmp; 457 status = acpi_evaluate_integer( 458 tz->device->handle, "_TC2", 459 NULL, &tmp); 460 if (ACPI_FAILURE(status)) 461 tz->trips.passive.flags.valid = 0; 462 else 463 tz->trips.passive.tc2 = tmp; 464 status = acpi_evaluate_integer( 465 tz->device->handle, "_TSP", 466 NULL, &tmp); 467 if (ACPI_FAILURE(status)) 468 tz->trips.passive.flags.valid = 0; 469 else 470 tz->trips.passive.tsp = tmp; 471 } 472 } 473 } 474 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { 475 memset(&devices, 0, sizeof(struct acpi_handle_list)); 476 status = acpi_evaluate_reference(tz->device->handle, "_PSL", 477 NULL, &devices); 478 if (ACPI_FAILURE(status)) { 479 printk(KERN_WARNING PREFIX 480 "Invalid passive threshold\n"); 481 tz->trips.passive.flags.valid = 0; 482 } 483 else 484 tz->trips.passive.flags.valid = 1; 485 486 if (memcmp(&tz->trips.passive.devices, &devices, 487 sizeof(struct acpi_handle_list))) { 488 memcpy(&tz->trips.passive.devices, &devices, 489 sizeof(struct acpi_handle_list)); 490 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 491 } 492 } 493 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { 494 if (valid != tz->trips.passive.flags.valid) 495 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 496 } 497 498 /* Active (optional) */ 499 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 500 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; 501 valid = tz->trips.active[i].flags.valid; 502 503 if (act == -1) 504 break; /* disable all active trip points */ 505 506 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && 507 tz->trips.active[i].flags.valid)) { 508 status = acpi_evaluate_integer(tz->device->handle, 509 name, NULL, &tmp); 510 if (ACPI_FAILURE(status)) { 511 tz->trips.active[i].flags.valid = 0; 512 if (i == 0) 513 break; 514 if (act <= 0) 515 break; 516 if (i == 1) 517 tz->trips.active[0].temperature = 518 CELSIUS_TO_KELVIN(act); 519 else 520 /* 521 * Don't allow override higher than 522 * the next higher trip point 523 */ 524 tz->trips.active[i - 1].temperature = 525 (tz->trips.active[i - 2].temperature < 526 CELSIUS_TO_KELVIN(act) ? 527 tz->trips.active[i - 2].temperature : 528 CELSIUS_TO_KELVIN(act)); 529 break; 530 } else { 531 tz->trips.active[i].temperature = tmp; 532 tz->trips.active[i].flags.valid = 1; 533 } 534 } 535 536 name[2] = 'L'; 537 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { 538 memset(&devices, 0, sizeof(struct acpi_handle_list)); 539 status = acpi_evaluate_reference(tz->device->handle, 540 name, NULL, &devices); 541 if (ACPI_FAILURE(status)) { 542 printk(KERN_WARNING PREFIX 543 "Invalid active%d threshold\n", i); 544 tz->trips.active[i].flags.valid = 0; 545 } 546 else 547 tz->trips.active[i].flags.valid = 1; 548 549 if (memcmp(&tz->trips.active[i].devices, &devices, 550 sizeof(struct acpi_handle_list))) { 551 memcpy(&tz->trips.active[i].devices, &devices, 552 sizeof(struct acpi_handle_list)); 553 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 554 } 555 } 556 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) 557 if (valid != tz->trips.active[i].flags.valid) 558 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); 559 560 if (!tz->trips.active[i].flags.valid) 561 break; 562 } 563 564 if (flag & ACPI_TRIPS_DEVICES) { 565 memset(&devices, 0, sizeof(struct acpi_handle_list)); 566 status = acpi_evaluate_reference(tz->device->handle, "_TZD", 567 NULL, &devices); 568 if (memcmp(&tz->devices, &devices, 569 sizeof(struct acpi_handle_list))) { 570 memcpy(&tz->devices, &devices, 571 sizeof(struct acpi_handle_list)); 572 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); 573 } 574 } 575 576 return 0; 577 } 578 579 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) 580 { 581 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); 582 583 if (ret) 584 return ret; 585 586 valid = tz->trips.critical.flags.valid | 587 tz->trips.hot.flags.valid | 588 tz->trips.passive.flags.valid; 589 590 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) 591 valid |= tz->trips.active[i].flags.valid; 592 593 if (!valid) { 594 printk(KERN_WARNING FW_BUG "No valid trip found\n"); 595 return -ENODEV; 596 } 597 return 0; 598 } 599 600 static void acpi_thermal_check(void *data) 601 { 602 struct acpi_thermal *tz = data; 603 604 thermal_zone_device_update(tz->thermal_zone); 605 } 606 607 /* sys I/F for generic thermal sysfs support */ 608 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) 609 610 static int thermal_get_temp(struct thermal_zone_device *thermal, 611 unsigned long *temp) 612 { 613 struct acpi_thermal *tz = thermal->devdata; 614 int result; 615 616 if (!tz) 617 return -EINVAL; 618 619 result = acpi_thermal_get_temperature(tz); 620 if (result) 621 return result; 622 623 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); 624 return 0; 625 } 626 627 static const char enabled[] = "kernel"; 628 static const char disabled[] = "user"; 629 static int thermal_get_mode(struct thermal_zone_device *thermal, 630 enum thermal_device_mode *mode) 631 { 632 struct acpi_thermal *tz = thermal->devdata; 633 634 if (!tz) 635 return -EINVAL; 636 637 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : 638 THERMAL_DEVICE_DISABLED; 639 640 return 0; 641 } 642 643 static int thermal_set_mode(struct thermal_zone_device *thermal, 644 enum thermal_device_mode mode) 645 { 646 struct acpi_thermal *tz = thermal->devdata; 647 int enable; 648 649 if (!tz) 650 return -EINVAL; 651 652 /* 653 * enable/disable thermal management from ACPI thermal driver 654 */ 655 if (mode == THERMAL_DEVICE_ENABLED) 656 enable = 1; 657 else if (mode == THERMAL_DEVICE_DISABLED) 658 enable = 0; 659 else 660 return -EINVAL; 661 662 if (enable != tz->tz_enabled) { 663 tz->tz_enabled = enable; 664 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 665 "%s ACPI thermal control\n", 666 tz->tz_enabled ? enabled : disabled)); 667 acpi_thermal_check(tz); 668 } 669 return 0; 670 } 671 672 static int thermal_get_trip_type(struct thermal_zone_device *thermal, 673 int trip, enum thermal_trip_type *type) 674 { 675 struct acpi_thermal *tz = thermal->devdata; 676 int i; 677 678 if (!tz || trip < 0) 679 return -EINVAL; 680 681 if (tz->trips.critical.flags.valid) { 682 if (!trip) { 683 *type = THERMAL_TRIP_CRITICAL; 684 return 0; 685 } 686 trip--; 687 } 688 689 if (tz->trips.hot.flags.valid) { 690 if (!trip) { 691 *type = THERMAL_TRIP_HOT; 692 return 0; 693 } 694 trip--; 695 } 696 697 if (tz->trips.passive.flags.valid) { 698 if (!trip) { 699 *type = THERMAL_TRIP_PASSIVE; 700 return 0; 701 } 702 trip--; 703 } 704 705 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 706 tz->trips.active[i].flags.valid; i++) { 707 if (!trip) { 708 *type = THERMAL_TRIP_ACTIVE; 709 return 0; 710 } 711 trip--; 712 } 713 714 return -EINVAL; 715 } 716 717 static int thermal_get_trip_temp(struct thermal_zone_device *thermal, 718 int trip, unsigned long *temp) 719 { 720 struct acpi_thermal *tz = thermal->devdata; 721 int i; 722 723 if (!tz || trip < 0) 724 return -EINVAL; 725 726 if (tz->trips.critical.flags.valid) { 727 if (!trip) { 728 *temp = KELVIN_TO_MILLICELSIUS( 729 tz->trips.critical.temperature, 730 tz->kelvin_offset); 731 return 0; 732 } 733 trip--; 734 } 735 736 if (tz->trips.hot.flags.valid) { 737 if (!trip) { 738 *temp = KELVIN_TO_MILLICELSIUS( 739 tz->trips.hot.temperature, 740 tz->kelvin_offset); 741 return 0; 742 } 743 trip--; 744 } 745 746 if (tz->trips.passive.flags.valid) { 747 if (!trip) { 748 *temp = KELVIN_TO_MILLICELSIUS( 749 tz->trips.passive.temperature, 750 tz->kelvin_offset); 751 return 0; 752 } 753 trip--; 754 } 755 756 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 757 tz->trips.active[i].flags.valid; i++) { 758 if (!trip) { 759 *temp = KELVIN_TO_MILLICELSIUS( 760 tz->trips.active[i].temperature, 761 tz->kelvin_offset); 762 return 0; 763 } 764 trip--; 765 } 766 767 return -EINVAL; 768 } 769 770 static int thermal_get_crit_temp(struct thermal_zone_device *thermal, 771 unsigned long *temperature) { 772 struct acpi_thermal *tz = thermal->devdata; 773 774 if (tz->trips.critical.flags.valid) { 775 *temperature = KELVIN_TO_MILLICELSIUS( 776 tz->trips.critical.temperature, 777 tz->kelvin_offset); 778 return 0; 779 } else 780 return -EINVAL; 781 } 782 783 static int thermal_notify(struct thermal_zone_device *thermal, int trip, 784 enum thermal_trip_type trip_type) 785 { 786 u8 type = 0; 787 struct acpi_thermal *tz = thermal->devdata; 788 789 if (trip_type == THERMAL_TRIP_CRITICAL) 790 type = ACPI_THERMAL_NOTIFY_CRITICAL; 791 else if (trip_type == THERMAL_TRIP_HOT) 792 type = ACPI_THERMAL_NOTIFY_HOT; 793 else 794 return 0; 795 796 acpi_bus_generate_proc_event(tz->device, type, 1); 797 acpi_bus_generate_netlink_event(tz->device->pnp.device_class, 798 dev_name(&tz->device->dev), type, 1); 799 800 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) 801 return 1; 802 803 return 0; 804 } 805 806 typedef int (*cb)(struct thermal_zone_device *, int, 807 struct thermal_cooling_device *); 808 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, 809 struct thermal_cooling_device *cdev, 810 cb action) 811 { 812 struct acpi_device *device = cdev->devdata; 813 struct acpi_thermal *tz = thermal->devdata; 814 struct acpi_device *dev; 815 acpi_status status; 816 acpi_handle handle; 817 int i; 818 int j; 819 int trip = -1; 820 int result = 0; 821 822 if (tz->trips.critical.flags.valid) 823 trip++; 824 825 if (tz->trips.hot.flags.valid) 826 trip++; 827 828 if (tz->trips.passive.flags.valid) { 829 trip++; 830 for (i = 0; i < tz->trips.passive.devices.count; 831 i++) { 832 handle = tz->trips.passive.devices.handles[i]; 833 status = acpi_bus_get_device(handle, &dev); 834 if (ACPI_SUCCESS(status) && (dev == device)) { 835 result = action(thermal, trip, cdev); 836 if (result) 837 goto failed; 838 } 839 } 840 } 841 842 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 843 if (!tz->trips.active[i].flags.valid) 844 break; 845 trip++; 846 for (j = 0; 847 j < tz->trips.active[i].devices.count; 848 j++) { 849 handle = tz->trips.active[i].devices.handles[j]; 850 status = acpi_bus_get_device(handle, &dev); 851 if (ACPI_SUCCESS(status) && (dev == device)) { 852 result = action(thermal, trip, cdev); 853 if (result) 854 goto failed; 855 } 856 } 857 } 858 859 for (i = 0; i < tz->devices.count; i++) { 860 handle = tz->devices.handles[i]; 861 status = acpi_bus_get_device(handle, &dev); 862 if (ACPI_SUCCESS(status) && (dev == device)) { 863 result = action(thermal, -1, cdev); 864 if (result) 865 goto failed; 866 } 867 } 868 869 failed: 870 return result; 871 } 872 873 static int 874 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, 875 struct thermal_cooling_device *cdev) 876 { 877 return acpi_thermal_cooling_device_cb(thermal, cdev, 878 thermal_zone_bind_cooling_device); 879 } 880 881 static int 882 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, 883 struct thermal_cooling_device *cdev) 884 { 885 return acpi_thermal_cooling_device_cb(thermal, cdev, 886 thermal_zone_unbind_cooling_device); 887 } 888 889 static struct thermal_zone_device_ops acpi_thermal_zone_ops = { 890 .bind = acpi_thermal_bind_cooling_device, 891 .unbind = acpi_thermal_unbind_cooling_device, 892 .get_temp = thermal_get_temp, 893 .get_mode = thermal_get_mode, 894 .set_mode = thermal_set_mode, 895 .get_trip_type = thermal_get_trip_type, 896 .get_trip_temp = thermal_get_trip_temp, 897 .get_crit_temp = thermal_get_crit_temp, 898 .notify = thermal_notify, 899 }; 900 901 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz) 902 { 903 int trips = 0; 904 int result; 905 acpi_status status; 906 int i; 907 908 if (tz->trips.critical.flags.valid) 909 trips++; 910 911 if (tz->trips.hot.flags.valid) 912 trips++; 913 914 if (tz->trips.passive.flags.valid) 915 trips++; 916 917 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && 918 tz->trips.active[i].flags.valid; i++, trips++); 919 920 if (tz->trips.passive.flags.valid) 921 tz->thermal_zone = 922 thermal_zone_device_register("acpitz", trips, tz, 923 &acpi_thermal_zone_ops, 924 tz->trips.passive.tc1, 925 tz->trips.passive.tc2, 926 tz->trips.passive.tsp*100, 927 tz->polling_frequency*100); 928 else 929 tz->thermal_zone = 930 thermal_zone_device_register("acpitz", trips, tz, 931 &acpi_thermal_zone_ops, 932 0, 0, 0, 933 tz->polling_frequency*100); 934 if (IS_ERR(tz->thermal_zone)) 935 return -ENODEV; 936 937 result = sysfs_create_link(&tz->device->dev.kobj, 938 &tz->thermal_zone->device.kobj, "thermal_zone"); 939 if (result) 940 return result; 941 942 result = sysfs_create_link(&tz->thermal_zone->device.kobj, 943 &tz->device->dev.kobj, "device"); 944 if (result) 945 return result; 946 947 status = acpi_attach_data(tz->device->handle, 948 acpi_bus_private_data_handler, 949 tz->thermal_zone); 950 if (ACPI_FAILURE(status)) { 951 printk(KERN_ERR PREFIX 952 "Error attaching device data\n"); 953 return -ENODEV; 954 } 955 956 tz->tz_enabled = 1; 957 958 dev_info(&tz->device->dev, "registered as thermal_zone%d\n", 959 tz->thermal_zone->id); 960 return 0; 961 } 962 963 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) 964 { 965 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); 966 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); 967 thermal_zone_device_unregister(tz->thermal_zone); 968 tz->thermal_zone = NULL; 969 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler); 970 } 971 972 973 /* -------------------------------------------------------------------------- 974 FS Interface (/proc) 975 -------------------------------------------------------------------------- */ 976 977 static struct proc_dir_entry *acpi_thermal_dir; 978 979 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) 980 { 981 struct acpi_thermal *tz = seq->private; 982 983 984 if (!tz) 985 goto end; 986 987 seq_puts(seq, "state: "); 988 989 if (!tz->state.critical && !tz->state.hot && !tz->state.passive 990 && !tz->state.active) 991 seq_puts(seq, "ok\n"); 992 else { 993 if (tz->state.critical) 994 seq_puts(seq, "critical "); 995 if (tz->state.hot) 996 seq_puts(seq, "hot "); 997 if (tz->state.passive) 998 seq_puts(seq, "passive "); 999 if (tz->state.active) 1000 seq_printf(seq, "active[%d]", tz->state.active_index); 1001 seq_puts(seq, "\n"); 1002 } 1003 1004 end: 1005 return 0; 1006 } 1007 1008 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) 1009 { 1010 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); 1011 } 1012 1013 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) 1014 { 1015 int result = 0; 1016 struct acpi_thermal *tz = seq->private; 1017 1018 1019 if (!tz) 1020 goto end; 1021 1022 result = acpi_thermal_get_temperature(tz); 1023 if (result) 1024 goto end; 1025 1026 seq_printf(seq, "temperature: %ld C\n", 1027 KELVIN_TO_CELSIUS(tz->temperature)); 1028 1029 end: 1030 return 0; 1031 } 1032 1033 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) 1034 { 1035 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); 1036 } 1037 1038 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) 1039 { 1040 struct acpi_thermal *tz = seq->private; 1041 struct acpi_device *device; 1042 acpi_status status; 1043 1044 int i = 0; 1045 int j = 0; 1046 1047 1048 if (!tz) 1049 goto end; 1050 1051 if (tz->trips.critical.flags.valid) 1052 seq_printf(seq, "critical (S5): %ld C%s", 1053 KELVIN_TO_CELSIUS(tz->trips.critical.temperature), 1054 nocrt ? " <disabled>\n" : "\n"); 1055 1056 if (tz->trips.hot.flags.valid) 1057 seq_printf(seq, "hot (S4): %ld C%s", 1058 KELVIN_TO_CELSIUS(tz->trips.hot.temperature), 1059 nocrt ? " <disabled>\n" : "\n"); 1060 1061 if (tz->trips.passive.flags.valid) { 1062 seq_printf(seq, 1063 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", 1064 KELVIN_TO_CELSIUS(tz->trips.passive.temperature), 1065 tz->trips.passive.tc1, tz->trips.passive.tc2, 1066 tz->trips.passive.tsp); 1067 for (j = 0; j < tz->trips.passive.devices.count; j++) { 1068 status = acpi_bus_get_device(tz->trips.passive.devices. 1069 handles[j], &device); 1070 seq_printf(seq, "%4.4s ", status ? "" : 1071 acpi_device_bid(device)); 1072 } 1073 seq_puts(seq, "\n"); 1074 } else { 1075 seq_printf(seq, "passive (forced):"); 1076 if (tz->thermal_zone->forced_passive) 1077 seq_printf(seq, " %i C\n", 1078 tz->thermal_zone->forced_passive / 1000); 1079 else 1080 seq_printf(seq, "<not set>\n"); 1081 } 1082 1083 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1084 if (!(tz->trips.active[i].flags.valid)) 1085 break; 1086 seq_printf(seq, "active[%d]: %ld C: devices=", 1087 i, 1088 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); 1089 for (j = 0; j < tz->trips.active[i].devices.count; j++){ 1090 status = acpi_bus_get_device(tz->trips.active[i]. 1091 devices.handles[j], 1092 &device); 1093 seq_printf(seq, "%4.4s ", status ? "" : 1094 acpi_device_bid(device)); 1095 } 1096 seq_puts(seq, "\n"); 1097 } 1098 1099 end: 1100 return 0; 1101 } 1102 1103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) 1104 { 1105 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); 1106 } 1107 1108 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) 1109 { 1110 struct acpi_thermal *tz = seq->private; 1111 1112 1113 if (!tz) 1114 goto end; 1115 1116 if (!tz->flags.cooling_mode) 1117 seq_puts(seq, "<setting not supported>\n"); 1118 else 1119 seq_puts(seq, "0 - Active; 1 - Passive\n"); 1120 1121 end: 1122 return 0; 1123 } 1124 1125 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) 1126 { 1127 return single_open(file, acpi_thermal_cooling_seq_show, 1128 PDE(inode)->data); 1129 } 1130 1131 static ssize_t 1132 acpi_thermal_write_cooling_mode(struct file *file, 1133 const char __user * buffer, 1134 size_t count, loff_t * ppos) 1135 { 1136 struct seq_file *m = file->private_data; 1137 struct acpi_thermal *tz = m->private; 1138 int result = 0; 1139 char mode_string[12] = { '\0' }; 1140 1141 1142 if (!tz || (count > sizeof(mode_string) - 1)) 1143 return -EINVAL; 1144 1145 if (!tz->flags.cooling_mode) 1146 return -ENODEV; 1147 1148 if (copy_from_user(mode_string, buffer, count)) 1149 return -EFAULT; 1150 1151 mode_string[count] = '\0'; 1152 1153 result = acpi_thermal_set_cooling_mode(tz, 1154 simple_strtoul(mode_string, NULL, 1155 0)); 1156 if (result) 1157 return result; 1158 1159 acpi_thermal_check(tz); 1160 1161 return count; 1162 } 1163 1164 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) 1165 { 1166 struct acpi_thermal *tz = seq->private; 1167 1168 1169 if (!tz) 1170 goto end; 1171 1172 if (!tz->thermal_zone->polling_delay) { 1173 seq_puts(seq, "<polling disabled>\n"); 1174 goto end; 1175 } 1176 1177 seq_printf(seq, "polling frequency: %d seconds\n", 1178 (tz->thermal_zone->polling_delay / 1000)); 1179 1180 end: 1181 return 0; 1182 } 1183 1184 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) 1185 { 1186 return single_open(file, acpi_thermal_polling_seq_show, 1187 PDE(inode)->data); 1188 } 1189 1190 static ssize_t 1191 acpi_thermal_write_polling(struct file *file, 1192 const char __user * buffer, 1193 size_t count, loff_t * ppos) 1194 { 1195 struct seq_file *m = file->private_data; 1196 struct acpi_thermal *tz = m->private; 1197 int result = 0; 1198 char polling_string[12] = { '\0' }; 1199 int seconds = 0; 1200 1201 1202 if (!tz || (count > sizeof(polling_string) - 1)) 1203 return -EINVAL; 1204 1205 if (copy_from_user(polling_string, buffer, count)) 1206 return -EFAULT; 1207 1208 polling_string[count] = '\0'; 1209 1210 seconds = simple_strtoul(polling_string, NULL, 0); 1211 1212 result = acpi_thermal_set_polling(tz, seconds); 1213 if (result) 1214 return result; 1215 1216 acpi_thermal_check(tz); 1217 1218 return count; 1219 } 1220 1221 static int acpi_thermal_add_fs(struct acpi_device *device) 1222 { 1223 struct proc_dir_entry *entry = NULL; 1224 1225 1226 if (!acpi_device_dir(device)) { 1227 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1228 acpi_thermal_dir); 1229 if (!acpi_device_dir(device)) 1230 return -ENODEV; 1231 } 1232 1233 /* 'state' [R] */ 1234 entry = proc_create_data(ACPI_THERMAL_FILE_STATE, 1235 S_IRUGO, acpi_device_dir(device), 1236 &acpi_thermal_state_fops, 1237 acpi_driver_data(device)); 1238 if (!entry) 1239 return -ENODEV; 1240 1241 /* 'temperature' [R] */ 1242 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE, 1243 S_IRUGO, acpi_device_dir(device), 1244 &acpi_thermal_temp_fops, 1245 acpi_driver_data(device)); 1246 if (!entry) 1247 return -ENODEV; 1248 1249 /* 'trip_points' [R] */ 1250 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS, 1251 S_IRUGO, 1252 acpi_device_dir(device), 1253 &acpi_thermal_trip_fops, 1254 acpi_driver_data(device)); 1255 if (!entry) 1256 return -ENODEV; 1257 1258 /* 'cooling_mode' [R/W] */ 1259 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE, 1260 S_IFREG | S_IRUGO | S_IWUSR, 1261 acpi_device_dir(device), 1262 &acpi_thermal_cooling_fops, 1263 acpi_driver_data(device)); 1264 if (!entry) 1265 return -ENODEV; 1266 1267 /* 'polling_frequency' [R/W] */ 1268 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ, 1269 S_IFREG | S_IRUGO | S_IWUSR, 1270 acpi_device_dir(device), 1271 &acpi_thermal_polling_fops, 1272 acpi_driver_data(device)); 1273 if (!entry) 1274 return -ENODEV; 1275 return 0; 1276 } 1277 1278 static int acpi_thermal_remove_fs(struct acpi_device *device) 1279 { 1280 1281 if (acpi_device_dir(device)) { 1282 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, 1283 acpi_device_dir(device)); 1284 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, 1285 acpi_device_dir(device)); 1286 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, 1287 acpi_device_dir(device)); 1288 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, 1289 acpi_device_dir(device)); 1290 remove_proc_entry(ACPI_THERMAL_FILE_STATE, 1291 acpi_device_dir(device)); 1292 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); 1293 acpi_device_dir(device) = NULL; 1294 } 1295 1296 return 0; 1297 } 1298 1299 /* -------------------------------------------------------------------------- 1300 Driver Interface 1301 -------------------------------------------------------------------------- */ 1302 1303 static void acpi_thermal_notify(struct acpi_device *device, u32 event) 1304 { 1305 struct acpi_thermal *tz = acpi_driver_data(device); 1306 1307 1308 if (!tz) 1309 return; 1310 1311 switch (event) { 1312 case ACPI_THERMAL_NOTIFY_TEMPERATURE: 1313 acpi_thermal_check(tz); 1314 break; 1315 case ACPI_THERMAL_NOTIFY_THRESHOLDS: 1316 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); 1317 acpi_thermal_check(tz); 1318 acpi_bus_generate_proc_event(device, event, 0); 1319 acpi_bus_generate_netlink_event(device->pnp.device_class, 1320 dev_name(&device->dev), event, 0); 1321 break; 1322 case ACPI_THERMAL_NOTIFY_DEVICES: 1323 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES); 1324 acpi_thermal_check(tz); 1325 acpi_bus_generate_proc_event(device, event, 0); 1326 acpi_bus_generate_netlink_event(device->pnp.device_class, 1327 dev_name(&device->dev), event, 0); 1328 break; 1329 default: 1330 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1331 "Unsupported event [0x%x]\n", event)); 1332 break; 1333 } 1334 } 1335 1336 static int acpi_thermal_get_info(struct acpi_thermal *tz) 1337 { 1338 int result = 0; 1339 1340 1341 if (!tz) 1342 return -EINVAL; 1343 1344 /* Get temperature [_TMP] (required) */ 1345 result = acpi_thermal_get_temperature(tz); 1346 if (result) 1347 return result; 1348 1349 /* Get trip points [_CRT, _PSV, etc.] (required) */ 1350 result = acpi_thermal_get_trip_points(tz); 1351 if (result) 1352 return result; 1353 1354 /* Set the cooling mode [_SCP] to active cooling (default) */ 1355 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); 1356 if (!result) 1357 tz->flags.cooling_mode = 1; 1358 1359 /* Get default polling frequency [_TZP] (optional) */ 1360 if (tzp) 1361 tz->polling_frequency = tzp; 1362 else 1363 acpi_thermal_get_polling_frequency(tz); 1364 1365 return 0; 1366 } 1367 1368 /* 1369 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI 1370 * handles temperature values with a single decimal place. As a consequence, 1371 * some implementations use an offset of 273.1 and others use an offset of 1372 * 273.2. Try to find out which one is being used, to present the most 1373 * accurate and visually appealing number. 1374 * 1375 * The heuristic below should work for all ACPI thermal zones which have a 1376 * critical trip point with a value being a multiple of 0.5 degree Celsius. 1377 */ 1378 static void acpi_thermal_guess_offset(struct acpi_thermal *tz) 1379 { 1380 if (tz->trips.critical.flags.valid && 1381 (tz->trips.critical.temperature % 5) == 1) 1382 tz->kelvin_offset = 2731; 1383 else 1384 tz->kelvin_offset = 2732; 1385 } 1386 1387 static int acpi_thermal_add(struct acpi_device *device) 1388 { 1389 int result = 0; 1390 struct acpi_thermal *tz = NULL; 1391 1392 1393 if (!device) 1394 return -EINVAL; 1395 1396 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); 1397 if (!tz) 1398 return -ENOMEM; 1399 1400 tz->device = device; 1401 strcpy(tz->name, device->pnp.bus_id); 1402 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); 1403 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); 1404 device->driver_data = tz; 1405 mutex_init(&tz->lock); 1406 1407 1408 result = acpi_thermal_get_info(tz); 1409 if (result) 1410 goto free_memory; 1411 1412 acpi_thermal_guess_offset(tz); 1413 1414 result = acpi_thermal_register_thermal_zone(tz); 1415 if (result) 1416 goto free_memory; 1417 1418 result = acpi_thermal_add_fs(device); 1419 if (result) 1420 goto unregister_thermal_zone; 1421 1422 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", 1423 acpi_device_name(device), acpi_device_bid(device), 1424 KELVIN_TO_CELSIUS(tz->temperature)); 1425 goto end; 1426 1427 unregister_thermal_zone: 1428 thermal_zone_device_unregister(tz->thermal_zone); 1429 free_memory: 1430 kfree(tz); 1431 end: 1432 return result; 1433 } 1434 1435 static int acpi_thermal_remove(struct acpi_device *device, int type) 1436 { 1437 struct acpi_thermal *tz = NULL; 1438 1439 if (!device || !acpi_driver_data(device)) 1440 return -EINVAL; 1441 1442 tz = acpi_driver_data(device); 1443 1444 acpi_thermal_remove_fs(device); 1445 acpi_thermal_unregister_thermal_zone(tz); 1446 mutex_destroy(&tz->lock); 1447 kfree(tz); 1448 return 0; 1449 } 1450 1451 static int acpi_thermal_resume(struct acpi_device *device) 1452 { 1453 struct acpi_thermal *tz = NULL; 1454 int i, j, power_state, result; 1455 1456 1457 if (!device || !acpi_driver_data(device)) 1458 return -EINVAL; 1459 1460 tz = acpi_driver_data(device); 1461 1462 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { 1463 if (!(&tz->trips.active[i])) 1464 break; 1465 if (!tz->trips.active[i].flags.valid) 1466 break; 1467 tz->trips.active[i].flags.enabled = 1; 1468 for (j = 0; j < tz->trips.active[i].devices.count; j++) { 1469 result = acpi_bus_get_power(tz->trips.active[i].devices. 1470 handles[j], &power_state); 1471 if (result || (power_state != ACPI_STATE_D0)) { 1472 tz->trips.active[i].flags.enabled = 0; 1473 break; 1474 } 1475 } 1476 tz->state.active |= tz->trips.active[i].flags.enabled; 1477 } 1478 1479 acpi_thermal_check(tz); 1480 1481 return AE_OK; 1482 } 1483 1484 static int thermal_act(const struct dmi_system_id *d) { 1485 1486 if (act == 0) { 1487 printk(KERN_NOTICE "ACPI: %s detected: " 1488 "disabling all active thermal trip points\n", d->ident); 1489 act = -1; 1490 } 1491 return 0; 1492 } 1493 static int thermal_nocrt(const struct dmi_system_id *d) { 1494 1495 printk(KERN_NOTICE "ACPI: %s detected: " 1496 "disabling all critical thermal trip point actions.\n", d->ident); 1497 nocrt = 1; 1498 return 0; 1499 } 1500 static int thermal_tzp(const struct dmi_system_id *d) { 1501 1502 if (tzp == 0) { 1503 printk(KERN_NOTICE "ACPI: %s detected: " 1504 "enabling thermal zone polling\n", d->ident); 1505 tzp = 300; /* 300 dS = 30 Seconds */ 1506 } 1507 return 0; 1508 } 1509 static int thermal_psv(const struct dmi_system_id *d) { 1510 1511 if (psv == 0) { 1512 printk(KERN_NOTICE "ACPI: %s detected: " 1513 "disabling all passive thermal trip points\n", d->ident); 1514 psv = -1; 1515 } 1516 return 0; 1517 } 1518 1519 static struct dmi_system_id thermal_dmi_table[] __initdata = { 1520 /* 1521 * Award BIOS on this AOpen makes thermal control almost worthless. 1522 * http://bugzilla.kernel.org/show_bug.cgi?id=8842 1523 */ 1524 { 1525 .callback = thermal_act, 1526 .ident = "AOpen i915GMm-HFS", 1527 .matches = { 1528 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1529 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1530 }, 1531 }, 1532 { 1533 .callback = thermal_psv, 1534 .ident = "AOpen i915GMm-HFS", 1535 .matches = { 1536 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1537 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1538 }, 1539 }, 1540 { 1541 .callback = thermal_tzp, 1542 .ident = "AOpen i915GMm-HFS", 1543 .matches = { 1544 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), 1545 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), 1546 }, 1547 }, 1548 { 1549 .callback = thermal_nocrt, 1550 .ident = "Gigabyte GA-7ZX", 1551 .matches = { 1552 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), 1553 DMI_MATCH(DMI_BOARD_NAME, "7ZX"), 1554 }, 1555 }, 1556 {} 1557 }; 1558 1559 static int __init acpi_thermal_init(void) 1560 { 1561 int result = 0; 1562 1563 dmi_check_system(thermal_dmi_table); 1564 1565 if (off) { 1566 printk(KERN_NOTICE "ACPI: thermal control disabled\n"); 1567 return -ENODEV; 1568 } 1569 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); 1570 if (!acpi_thermal_dir) 1571 return -ENODEV; 1572 1573 result = acpi_bus_register_driver(&acpi_thermal_driver); 1574 if (result < 0) { 1575 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1576 return -ENODEV; 1577 } 1578 1579 return 0; 1580 } 1581 1582 static void __exit acpi_thermal_exit(void) 1583 { 1584 1585 acpi_bus_unregister_driver(&acpi_thermal_driver); 1586 1587 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); 1588 1589 return; 1590 } 1591 1592 module_init(acpi_thermal_init); 1593 module_exit(acpi_thermal_exit); 1594