drivers/acpi/thermal.c

   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_NOTIFY_TEMPERATURE 0x80
  54 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  55 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  56 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  57 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  58 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  59
  60 #define ACPI_THERMAL_MAX_ACTIVE 10
  61 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  62
  63 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  64 ACPI_MODULE_NAME("thermal");
  65
  66 MODULE_AUTHOR("Paul Diefenbaugh");
  67 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  68 MODULE_LICENSE("GPL");
  69
  70 static int act;
  71 module_param(act, int, 0644);
  72 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  73
  74 static int crt;
  75 module_param(crt, int, 0644);
  76 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  77
  78 static int tzp;
  79 module_param(tzp, int, 0444);
  80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  81
  82 static int nocrt;
  83 module_param(nocrt, int, 0);
  84 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  85
  86 static int off;
  87 module_param(off, int, 0);
  88 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  89
  90 static int psv;
  91 module_param(psv, int, 0644);
  92 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  93
  94 static int acpi_thermal_add(struct acpi_device *device);
  95 static int acpi_thermal_remove(struct acpi_device *device);
  96 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
  97
  98 static const struct acpi_device_id  thermal_device_ids[] = {
  99         {ACPI_THERMAL_HID, 0},
 100         {"", 0},
 101 };
 102 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 103
 104 #ifdef CONFIG_PM_SLEEP
 105 static int acpi_thermal_resume(struct device *dev);
 106 #endif
 107 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
 108
 109 static struct acpi_driver acpi_thermal_driver = {
 110         .name = "thermal",
 111         .class = ACPI_THERMAL_CLASS,
 112         .ids = thermal_device_ids,
 113         .ops = {
 114                 .add = acpi_thermal_add,
 115                 .remove = acpi_thermal_remove,
 116                 .notify = acpi_thermal_notify,
 117                 },
 118         .drv.pm = &acpi_thermal_pm,
 119 };
 120
 121 struct acpi_thermal_state {
 122         u8 critical:1;
 123         u8 hot:1;
 124         u8 passive:1;
 125         u8 active:1;
 126         u8 reserved:4;
 127         int active_index;
 128 };
 129
 130 struct acpi_thermal_state_flags {
 131         u8 valid:1;
 132         u8 enabled:1;
 133         u8 reserved:6;
 134 };
 135
 136 struct acpi_thermal_critical {
 137         struct acpi_thermal_state_flags flags;
 138         unsigned long temperature;
 139 };
 140
 141 struct acpi_thermal_hot {
 142         struct acpi_thermal_state_flags flags;
 143         unsigned long temperature;
 144 };
 145
 146 struct acpi_thermal_passive {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149         unsigned long tc1;
 150         unsigned long tc2;
 151         unsigned long tsp;
 152         struct acpi_handle_list devices;
 153 };
 154
 155 struct acpi_thermal_active {
 156         struct acpi_thermal_state_flags flags;
 157         unsigned long temperature;
 158         struct acpi_handle_list devices;
 159 };
 160
 161 struct acpi_thermal_trips {
 162         struct acpi_thermal_critical critical;
 163         struct acpi_thermal_hot hot;
 164         struct acpi_thermal_passive passive;
 165         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 166 };
 167
 168 struct acpi_thermal_flags {
 169         u8 cooling_mode:1;      /* _SCP */
 170         u8 devices:1;           /* _TZD */
 171         u8 reserved:6;
 172 };
 173
 174 struct acpi_thermal {
 175         struct acpi_device * device;
 176         acpi_bus_id name;
 177         unsigned long temperature;
 178         unsigned long last_temperature;
 179         unsigned long polling_frequency;
 180         volatile u8 zombie;
 181         struct acpi_thermal_flags flags;
 182         struct acpi_thermal_state state;
 183         struct acpi_thermal_trips trips;
 184         struct acpi_handle_list devices;
 185         struct thermal_zone_device *thermal_zone;
 186         int tz_enabled;
 187         int kelvin_offset;
 188 };
 189
 190 /* --------------------------------------------------------------------------
 191                              Thermal Zone Management
 192    -------------------------------------------------------------------------- */
 193
 194 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 195 {
 196         acpi_status status = AE_OK;
 197         unsigned long long tmp;
 198
 199         if (!tz)
 200                 return -EINVAL;
 201
 202         tz->last_temperature = tz->temperature;
 203
 204         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 205         if (ACPI_FAILURE(status))
 206                 return -ENODEV;
 207
 208         tz->temperature = tmp;
 209         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 210                           tz->temperature));
 211
 212         return 0;
 213 }
 214
 215 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 216 {
 217         acpi_status status = AE_OK;
 218         unsigned long long tmp;
 219
 220         if (!tz)
 221                 return -EINVAL;
 222
 223         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 224         if (ACPI_FAILURE(status))
 225                 return -ENODEV;
 226
 227         tz->polling_frequency = tmp;
 228         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 229                           tz->polling_frequency));
 230
 231         return 0;
 232 }
 233
 234 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 235 {
 236         acpi_status status = AE_OK;
 237         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 238         struct acpi_object_list arg_list = { 1, &arg0 };
 239         acpi_handle handle = NULL;
 240
 241
 242         if (!tz)
 243                 return -EINVAL;
 244
 245         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 246         if (ACPI_FAILURE(status)) {
 247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 248                 return -ENODEV;
 249         }
 250
 251         arg0.integer.value = mode;
 252
 253         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 254         if (ACPI_FAILURE(status))
 255                 return -ENODEV;
 256
 257         return 0;
 258 }
 259
 260 #define ACPI_TRIPS_CRITICAL     0x01
 261 #define ACPI_TRIPS_HOT          0x02
 262 #define ACPI_TRIPS_PASSIVE      0x04
 263 #define ACPI_TRIPS_ACTIVE       0x08
 264 #define ACPI_TRIPS_DEVICES      0x10
 265
 266 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 267 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 268
 269 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 270                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 271                               ACPI_TRIPS_DEVICES)
 272
 273 /*
 274  * This exception is thrown out in two cases:
 275  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 276  *   when re-evaluating the AML code.
 277  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 278  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 279  */
 280 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 281 do {    \
 282         if (flags != ACPI_TRIPS_INIT)   \
 283                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 284                 "ACPI thermal trip point %s changed\n"  \
 285                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 286 } while (0)
 287
 288 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 289 {
 290         acpi_status status = AE_OK;
 291         unsigned long long tmp;
 292         struct acpi_handle_list devices;
 293         int valid = 0;
 294         int i;
 295
 296         /* Critical Shutdown */
 297         if (flag & ACPI_TRIPS_CRITICAL) {
 298                 status = acpi_evaluate_integer(tz->device->handle,
 299                                 "_CRT", NULL, &tmp);
 300                 tz->trips.critical.temperature = tmp;
 301                 /*
 302                  * Treat freezing temperatures as invalid as well; some
 303                  * BIOSes return really low values and cause reboots at startup.
 304                  * Below zero (Celsius) values clearly aren't right for sure..
 305                  * ... so lets discard those as invalid.
 306                  */
 307                 if (ACPI_FAILURE(status)) {
 308                         tz->trips.critical.flags.valid = 0;
 309                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 310                                           "No critical threshold\n"));
 311                 } else if (tmp <= 2732) {
 312                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 313                                "(%llu)\n", tmp);
 314                         tz->trips.critical.flags.valid = 0;
 315                 } else {
 316                         tz->trips.critical.flags.valid = 1;
 317                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 318                                           "Found critical threshold [%lu]\n",
 319                                           tz->trips.critical.temperature));
 320                 }
 321                 if (tz->trips.critical.flags.valid == 1) {
 322                         if (crt == -1) {
 323                                 tz->trips.critical.flags.valid = 0;
 324                         } else if (crt > 0) {
 325                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 326                                 /*
 327                                  * Allow override critical threshold
 328                                  */
 329                                 if (crt_k > tz->trips.critical.temperature)
 330                                         printk(KERN_WARNING PREFIX
 331                                                 "Critical threshold %d C\n", crt);
 332                                 tz->trips.critical.temperature = crt_k;
 333                         }
 334                 }
 335         }
 336
 337         /* Critical Sleep (optional) */
 338         if (flag & ACPI_TRIPS_HOT) {
 339                 status = acpi_evaluate_integer(tz->device->handle,
 340                                 "_HOT", NULL, &tmp);
 341                 if (ACPI_FAILURE(status)) {
 342                         tz->trips.hot.flags.valid = 0;
 343                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 344                                         "No hot threshold\n"));
 345                 } else {
 346                         tz->trips.hot.temperature = tmp;
 347                         tz->trips.hot.flags.valid = 1;
 348                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 349                                         "Found hot threshold [%lu]\n",
 350                                         tz->trips.critical.temperature));
 351                 }
 352         }
 353
 354         /* Passive (optional) */
 355         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 356                 (flag == ACPI_TRIPS_INIT)) {
 357                 valid = tz->trips.passive.flags.valid;
 358                 if (psv == -1) {
 359                         status = AE_SUPPORT;
 360                 } else if (psv > 0) {
 361                         tmp = CELSIUS_TO_KELVIN(psv);
 362                         status = AE_OK;
 363                 } else {
 364                         status = acpi_evaluate_integer(tz->device->handle,
 365                                 "_PSV", NULL, &tmp);
 366                 }
 367
 368                 if (ACPI_FAILURE(status))
 369                         tz->trips.passive.flags.valid = 0;
 370                 else {
 371                         tz->trips.passive.temperature = tmp;
 372                         tz->trips.passive.flags.valid = 1;
 373                         if (flag == ACPI_TRIPS_INIT) {
 374                                 status = acpi_evaluate_integer(
 375                                                 tz->device->handle, "_TC1",
 376                                                 NULL, &tmp);
 377                                 if (ACPI_FAILURE(status))
 378                                         tz->trips.passive.flags.valid = 0;
 379                                 else
 380                                         tz->trips.passive.tc1 = tmp;
 381                                 status = acpi_evaluate_integer(
 382                                                 tz->device->handle, "_TC2",
 383                                                 NULL, &tmp);
 384                                 if (ACPI_FAILURE(status))
 385                                         tz->trips.passive.flags.valid = 0;
 386                                 else
 387                                         tz->trips.passive.tc2 = tmp;
 388                                 status = acpi_evaluate_integer(
 389                                                 tz->device->handle, "_TSP",
 390                                                 NULL, &tmp);
 391                                 if (ACPI_FAILURE(status))
 392                                         tz->trips.passive.flags.valid = 0;
 393                                 else
 394                                         tz->trips.passive.tsp = tmp;
 395                         }
 396                 }
 397         }
 398         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 399                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 400                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 401                                                         NULL, &devices);
 402                 if (ACPI_FAILURE(status)) {
 403                         printk(KERN_WARNING PREFIX
 404                                 "Invalid passive threshold\n");
 405                         tz->trips.passive.flags.valid = 0;
 406                 }
 407                 else
 408                         tz->trips.passive.flags.valid = 1;
 409
 410                 if (memcmp(&tz->trips.passive.devices, &devices,
 411                                 sizeof(struct acpi_handle_list))) {
 412                         memcpy(&tz->trips.passive.devices, &devices,
 413                                 sizeof(struct acpi_handle_list));
 414                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 415                 }
 416         }
 417         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 418                 if (valid != tz->trips.passive.flags.valid)
 419                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 420         }
 421
 422         /* Active (optional) */
 423         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 424                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 425                 valid = tz->trips.active[i].flags.valid;
 426
 427                 if (act == -1)
 428                         break; /* disable all active trip points */
 429
 430                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 431                         tz->trips.active[i].flags.valid)) {
 432                         status = acpi_evaluate_integer(tz->device->handle,
 433                                                         name, NULL, &tmp);
 434                         if (ACPI_FAILURE(status)) {
 435                                 tz->trips.active[i].flags.valid = 0;
 436                                 if (i == 0)
 437                                         break;
 438                                 if (act <= 0)
 439                                         break;
 440                                 if (i == 1)
 441                                         tz->trips.active[0].temperature =
 442                                                 CELSIUS_TO_KELVIN(act);
 443                                 else
 444                                         /*
 445                                          * Don't allow override higher than
 446                                          * the next higher trip point
 447                                          */
 448                                         tz->trips.active[i - 1].temperature =
 449                                                 (tz->trips.active[i - 2].temperature <
 450                                                 CELSIUS_TO_KELVIN(act) ?
 451                                                 tz->trips.active[i - 2].temperature :
 452                                                 CELSIUS_TO_KELVIN(act));
 453                                 break;
 454                         } else {
 455                                 tz->trips.active[i].temperature = tmp;
 456                                 tz->trips.active[i].flags.valid = 1;
 457                         }
 458                 }
 459
 460                 name[2] = 'L';
 461                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 462                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 463                         status = acpi_evaluate_reference(tz->device->handle,
 464                                                 name, NULL, &devices);
 465                         if (ACPI_FAILURE(status)) {
 466                                 printk(KERN_WARNING PREFIX
 467                                         "Invalid active%d threshold\n", i);
 468                                 tz->trips.active[i].flags.valid = 0;
 469                         }
 470                         else
 471                                 tz->trips.active[i].flags.valid = 1;
 472
 473                         if (memcmp(&tz->trips.active[i].devices, &devices,
 474                                         sizeof(struct acpi_handle_list))) {
 475                                 memcpy(&tz->trips.active[i].devices, &devices,
 476                                         sizeof(struct acpi_handle_list));
 477                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 478                         }
 479                 }
 480                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 481                         if (valid != tz->trips.active[i].flags.valid)
 482                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 483
 484                 if (!tz->trips.active[i].flags.valid)
 485                         break;
 486         }
 487
 488         if (flag & ACPI_TRIPS_DEVICES) {
 489                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 490                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 491                                                 NULL, &devices);
 492                 if (memcmp(&tz->devices, &devices,
 493                                 sizeof(struct acpi_handle_list))) {
 494                         memcpy(&tz->devices, &devices,
 495                                 sizeof(struct acpi_handle_list));
 496                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 497                 }
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 504 {
 505         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 506
 507         if (ret)
 508                 return ret;
 509
 510         valid = tz->trips.critical.flags.valid |
 511                 tz->trips.hot.flags.valid |
 512                 tz->trips.passive.flags.valid;
 513
 514         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 515                 valid |= tz->trips.active[i].flags.valid;
 516
 517         if (!valid) {
 518                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 519                 return -ENODEV;
 520         }
 521         return 0;
 522 }
 523
 524 static void acpi_thermal_check(void *data)
 525 {
 526         struct acpi_thermal *tz = data;
 527
 528         if (!tz->tz_enabled) {
 529                 pr_warn("thermal zone is disabled \n");
 530                 return;
 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_get_trend(struct thermal_zone_device *thermal,
 710                                 int trip, enum thermal_trend *trend)
 711 {
 712         struct acpi_thermal *tz = thermal->devdata;
 713         enum thermal_trip_type type;
 714         int i;
 715
 716         if (thermal_get_trip_type(thermal, trip, &type))
 717                 return -EINVAL;
 718
 719         if (type == THERMAL_TRIP_ACTIVE) {
 720                 unsigned long trip_temp;
 721                 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
 722                                                         tz->kelvin_offset);
 723                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 724                         return -EINVAL;
 725
 726                 if (temp > trip_temp) {
 727                         *trend = THERMAL_TREND_RAISING;
 728                         return 0;
 729                 } else {
 730                         /* Fall back on default trend */
 731                         return -EINVAL;
 732                 }
 733         }
 734
 735         /*
 736          * tz->temperature has already been updated by generic thermal layer,
 737          * before this callback being invoked
 738          */
 739         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 740                 + (tz->trips.passive.tc2
 741                 * (tz->temperature - tz->trips.passive.temperature));
 742
 743         if (i > 0)
 744                 *trend = THERMAL_TREND_RAISING;
 745         else if (i < 0)
 746                 *trend = THERMAL_TREND_DROPPING;
 747         else
 748                 *trend = THERMAL_TREND_STABLE;
 749         return 0;
 750 }
 751
 752
 753 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 754                            enum thermal_trip_type trip_type)
 755 {
 756         u8 type = 0;
 757         struct acpi_thermal *tz = thermal->devdata;
 758
 759         if (trip_type == THERMAL_TRIP_CRITICAL)
 760                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 761         else if (trip_type == THERMAL_TRIP_HOT)
 762                 type = ACPI_THERMAL_NOTIFY_HOT;
 763         else
 764                 return 0;
 765
 766         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 767                                         dev_name(&tz->device->dev), type, 1);
 768
 769         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 770                 return 1;
 771
 772         return 0;
 773 }
 774
 775 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 776                                         struct thermal_cooling_device *cdev,
 777                                         bool bind)
 778 {
 779         struct acpi_device *device = cdev->devdata;
 780         struct acpi_thermal *tz = thermal->devdata;
 781         struct acpi_device *dev;
 782         acpi_status status;
 783         acpi_handle handle;
 784         int i;
 785         int j;
 786         int trip = -1;
 787         int result = 0;
 788
 789         if (tz->trips.critical.flags.valid)
 790                 trip++;
 791
 792         if (tz->trips.hot.flags.valid)
 793                 trip++;
 794
 795         if (tz->trips.passive.flags.valid) {
 796                 trip++;
 797                 for (i = 0; i < tz->trips.passive.devices.count;
 798                     i++) {
 799                         handle = tz->trips.passive.devices.handles[i];
 800                         status = acpi_bus_get_device(handle, &dev);
 801                         if (ACPI_FAILURE(status) || dev != device)
 802                                 continue;
 803                         if (bind)
 804                                 result =
 805                                         thermal_zone_bind_cooling_device
 806                                         (thermal, trip, cdev,
 807                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 808                         else
 809                                 result =
 810                                         thermal_zone_unbind_cooling_device
 811                                         (thermal, trip, cdev);
 812                         if (result)
 813                                 goto failed;
 814                 }
 815         }
 816
 817         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 818                 if (!tz->trips.active[i].flags.valid)
 819                         break;
 820                 trip++;
 821                 for (j = 0;
 822                     j < tz->trips.active[i].devices.count;
 823                     j++) {
 824                         handle = tz->trips.active[i].devices.handles[j];
 825                         status = acpi_bus_get_device(handle, &dev);
 826                         if (ACPI_FAILURE(status) || dev != device)
 827                                 continue;
 828                         if (bind)
 829                                 result = thermal_zone_bind_cooling_device
 830                                         (thermal, trip, cdev,
 831                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 832                         else
 833                                 result = thermal_zone_unbind_cooling_device
 834                                         (thermal, trip, cdev);
 835                         if (result)
 836                                 goto failed;
 837                 }
 838         }
 839
 840         for (i = 0; i < tz->devices.count; i++) {
 841                 handle = tz->devices.handles[i];
 842                 status = acpi_bus_get_device(handle, &dev);
 843                 if (ACPI_SUCCESS(status) && (dev == device)) {
 844                         if (bind)
 845                                 result = thermal_zone_bind_cooling_device
 846                                                 (thermal, THERMAL_TRIPS_NONE,
 847                                                  cdev, THERMAL_NO_LIMIT,
 848                                                  THERMAL_NO_LIMIT);
 849                         else
 850                                 result = thermal_zone_unbind_cooling_device
 851                                                 (thermal, THERMAL_TRIPS_NONE,
 852                                                  cdev);
 853                         if (result)
 854                                 goto failed;
 855                 }
 856         }
 857
 858 failed:
 859         return result;
 860 }
 861
 862 static int
 863 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 864                                         struct thermal_cooling_device *cdev)
 865 {
 866         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 867 }
 868
 869 static int
 870 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 871                                         struct thermal_cooling_device *cdev)
 872 {
 873         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 874 }
 875
 876 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 877         .bind = acpi_thermal_bind_cooling_device,
 878         .unbind = acpi_thermal_unbind_cooling_device,
 879         .get_temp = thermal_get_temp,
 880         .get_mode = thermal_get_mode,
 881         .set_mode = thermal_set_mode,
 882         .get_trip_type = thermal_get_trip_type,
 883         .get_trip_temp = thermal_get_trip_temp,
 884         .get_crit_temp = thermal_get_crit_temp,
 885         .get_trend = thermal_get_trend,
 886         .notify = thermal_notify,
 887 };
 888
 889 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 890 {
 891         int trips = 0;
 892         int result;
 893         acpi_status status;
 894         int i;
 895
 896         if (tz->trips.critical.flags.valid)
 897                 trips++;
 898
 899         if (tz->trips.hot.flags.valid)
 900                 trips++;
 901
 902         if (tz->trips.passive.flags.valid)
 903                 trips++;
 904
 905         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 906                         tz->trips.active[i].flags.valid; i++, trips++);
 907
 908         if (tz->trips.passive.flags.valid)
 909                 tz->thermal_zone =
 910                         thermal_zone_device_register("acpitz", trips, 0, tz,
 911                                                 &acpi_thermal_zone_ops, NULL,
 912                                                      tz->trips.passive.tsp*100,
 913                                                      tz->polling_frequency*100);
 914         else
 915                 tz->thermal_zone =
 916                         thermal_zone_device_register("acpitz", trips, 0, tz,
 917                                                 &acpi_thermal_zone_ops, NULL,
 918                                                 0, tz->polling_frequency*100);
 919         if (IS_ERR(tz->thermal_zone))
 920                 return -ENODEV;
 921
 922         result = sysfs_create_link(&tz->device->dev.kobj,
 923                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 924         if (result)
 925                 return result;
 926
 927         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 928                                    &tz->device->dev.kobj, "device");
 929         if (result)
 930                 return result;
 931
 932         status = acpi_attach_data(tz->device->handle,
 933                                   acpi_bus_private_data_handler,
 934                                   tz->thermal_zone);
 935         if (ACPI_FAILURE(status)) {
 936                 printk(KERN_ERR PREFIX
 937                                 "Error attaching device data\n");
 938                 return -ENODEV;
 939         }
 940
 941         tz->tz_enabled = 1;
 942
 943         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 944                  tz->thermal_zone->id);
 945         return 0;
 946 }
 947
 948 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 949 {
 950         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 951         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 952         thermal_zone_device_unregister(tz->thermal_zone);
 953         tz->thermal_zone = NULL;
 954         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 955 }
 956
 957
 958 /* --------------------------------------------------------------------------
 959                                  Driver Interface
 960    -------------------------------------------------------------------------- */
 961
 962 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 963 {
 964         struct acpi_thermal *tz = acpi_driver_data(device);
 965
 966
 967         if (!tz)
 968                 return;
 969
 970         switch (event) {
 971         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 972                 acpi_thermal_check(tz);
 973                 break;
 974         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 975                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 976                 acpi_thermal_check(tz);
 977                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 978                                                   dev_name(&device->dev), event, 0);
 979                 break;
 980         case ACPI_THERMAL_NOTIFY_DEVICES:
 981                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 982                 acpi_thermal_check(tz);
 983                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 984                                                   dev_name(&device->dev), event, 0);
 985                 break;
 986         default:
 987                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 988                                   "Unsupported event [0x%x]\n", event));
 989                 break;
 990         }
 991 }
 992
 993 /*
 994  * On some platforms, the AML code has dependency about
 995  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 996  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 997  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 998  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 999  *    if _TMP has never been evaluated.
1000  *
1001  * As this dependency is totally transparent to OS, evaluate
1002  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
1003  * _TMP, before they are actually used.
1004  */
1005 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1006 {
1007         acpi_handle handle = tz->device->handle;
1008         unsigned long long value;
1009         int i;
1010
1011         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1012         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1013         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1014         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1015                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1016                 acpi_status status;
1017
1018                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1019                 if (status == AE_NOT_FOUND)
1020                         break;
1021         }
1022         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1023 }
1024
1025 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1026 {
1027         int result = 0;
1028
1029
1030         if (!tz)
1031                 return -EINVAL;
1032
1033         acpi_thermal_aml_dependency_fix(tz);
1034
1035         /* Get trip points [_CRT, _PSV, etc.] (required) */
1036         result = acpi_thermal_get_trip_points(tz);
1037         if (result)
1038                 return result;
1039
1040         /* Get temperature [_TMP] (required) */
1041         result = acpi_thermal_get_temperature(tz);
1042         if (result)
1043                 return result;
1044
1045         /* Set the cooling mode [_SCP] to active cooling (default) */
1046         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1047         if (!result)
1048                 tz->flags.cooling_mode = 1;
1049
1050         /* Get default polling frequency [_TZP] (optional) */
1051         if (tzp)
1052                 tz->polling_frequency = tzp;
1053         else
1054                 acpi_thermal_get_polling_frequency(tz);
1055
1056         return 0;
1057 }
1058
1059 /*
1060  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1061  * handles temperature values with a single decimal place. As a consequence,
1062  * some implementations use an offset of 273.1 and others use an offset of
1063  * 273.2. Try to find out which one is being used, to present the most
1064  * accurate and visually appealing number.
1065  *
1066  * The heuristic below should work for all ACPI thermal zones which have a
1067  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1068  */
1069 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1070 {
1071         if (tz->trips.critical.flags.valid &&
1072             (tz->trips.critical.temperature % 5) == 1)
1073                 tz->kelvin_offset = 2731;
1074         else
1075                 tz->kelvin_offset = 2732;
1076 }
1077
1078 static int acpi_thermal_add(struct acpi_device *device)
1079 {
1080         int result = 0;
1081         struct acpi_thermal *tz = NULL;
1082
1083
1084         if (!device)
1085                 return -EINVAL;
1086
1087         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1088         if (!tz)
1089                 return -ENOMEM;
1090
1091         tz->device = device;
1092         strcpy(tz->name, device->pnp.bus_id);
1093         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1094         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1095         device->driver_data = tz;
1096
1097         result = acpi_thermal_get_info(tz);
1098         if (result)
1099                 goto free_memory;
1100
1101         acpi_thermal_guess_offset(tz);
1102
1103         result = acpi_thermal_register_thermal_zone(tz);
1104         if (result)
1105                 goto free_memory;
1106
1107         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1108                acpi_device_name(device), acpi_device_bid(device),
1109                KELVIN_TO_CELSIUS(tz->temperature));
1110         goto end;
1111
1112 free_memory:
1113         kfree(tz);
1114 end:
1115         return result;
1116 }
1117
1118 static int acpi_thermal_remove(struct acpi_device *device)
1119 {
1120         struct acpi_thermal *tz = NULL;
1121
1122         if (!device || !acpi_driver_data(device))
1123                 return -EINVAL;
1124
1125         tz = acpi_driver_data(device);
1126
1127         acpi_thermal_unregister_thermal_zone(tz);
1128         kfree(tz);
1129         return 0;
1130 }
1131
1132 #ifdef CONFIG_PM_SLEEP
1133 static int acpi_thermal_resume(struct device *dev)
1134 {
1135         struct acpi_thermal *tz;
1136         int i, j, power_state, result;
1137
1138         if (!dev)
1139                 return -EINVAL;
1140
1141         tz = acpi_driver_data(to_acpi_device(dev));
1142         if (!tz)
1143                 return -EINVAL;
1144
1145         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1146                 if (!(&tz->trips.active[i]))
1147                         break;
1148                 if (!tz->trips.active[i].flags.valid)
1149                         break;
1150                 tz->trips.active[i].flags.enabled = 1;
1151                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1152                         result = acpi_bus_update_power(
1153                                         tz->trips.active[i].devices.handles[j],
1154                                         &power_state);
1155                         if (result || (power_state != ACPI_STATE_D0)) {
1156                                 tz->trips.active[i].flags.enabled = 0;
1157                                 break;
1158                         }
1159                 }
1160                 tz->state.active |= tz->trips.active[i].flags.enabled;
1161         }
1162
1163         acpi_thermal_check(tz);
1164
1165         return AE_OK;
1166 }
1167 #endif
1168
1169 static int thermal_act(const struct dmi_system_id *d) {
1170
1171         if (act == 0) {
1172                 printk(KERN_NOTICE "ACPI: %s detected: "
1173                         "disabling all active thermal trip points\n", d->ident);
1174                 act = -1;
1175         }
1176         return 0;
1177 }
1178 static int thermal_nocrt(const struct dmi_system_id *d) {
1179
1180         printk(KERN_NOTICE "ACPI: %s detected: "
1181                 "disabling all critical thermal trip point actions.\n", d->ident);
1182         nocrt = 1;
1183         return 0;
1184 }
1185 static int thermal_tzp(const struct dmi_system_id *d) {
1186
1187         if (tzp == 0) {
1188                 printk(KERN_NOTICE "ACPI: %s detected: "
1189                         "enabling thermal zone polling\n", d->ident);
1190                 tzp = 300;      /* 300 dS = 30 Seconds */
1191         }
1192         return 0;
1193 }
1194 static int thermal_psv(const struct dmi_system_id *d) {
1195
1196         if (psv == 0) {
1197                 printk(KERN_NOTICE "ACPI: %s detected: "
1198                         "disabling all passive thermal trip points\n", d->ident);
1199                 psv = -1;
1200         }
1201         return 0;
1202 }
1203
1204 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1205         /*
1206          * Award BIOS on this AOpen makes thermal control almost worthless.
1207          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1208          */
1209         {
1210          .callback = thermal_act,
1211          .ident = "AOpen i915GMm-HFS",
1212          .matches = {
1213                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1214                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1215                 },
1216         },
1217         {
1218          .callback = thermal_psv,
1219          .ident = "AOpen i915GMm-HFS",
1220          .matches = {
1221                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1222                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1223                 },
1224         },
1225         {
1226          .callback = thermal_tzp,
1227          .ident = "AOpen i915GMm-HFS",
1228          .matches = {
1229                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1230                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1231                 },
1232         },
1233         {
1234          .callback = thermal_nocrt,
1235          .ident = "Gigabyte GA-7ZX",
1236          .matches = {
1237                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1238                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1239                 },
1240         },
1241         {}
1242 };
1243
1244 static int __init acpi_thermal_init(void)
1245 {
1246         int result = 0;
1247
1248         dmi_check_system(thermal_dmi_table);
1249
1250         if (off) {
1251                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1252                 return -ENODEV;
1253         }
1254
1255         result = acpi_bus_register_driver(&acpi_thermal_driver);
1256         if (result < 0)
1257                 return -ENODEV;
1258
1259         return 0;
1260 }
1261
1262 static void __exit acpi_thermal_exit(void)
1263 {
1264
1265         acpi_bus_unregister_driver(&acpi_thermal_driver);
1266
1267         return;
1268 }
1269
1270 module_init(acpi_thermal_init);
1271 module_exit(acpi_thermal_exit);