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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  *
  21  *  This driver fully implements the ACPI thermal policy as described in the
  22  *  ACPI 2.0 Specification.
  23  *
  24  *  TBD: 1. Implement passive cooling hysteresis.
  25  *       2. Enhance passive cooling (CPU) states/limit interface to support
  26  *          concepts of 'multiple limiters', upper/lower limits, etc.
  27  *
  28  */
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/dmi.h>
  33 #include <linux/init.h>
  34 #include <linux/slab.h>
  35 #include <linux/types.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/kmod.h>
  38 #include <linux/reboot.h>
  39 #include <linux/device.h>
  40 #include <linux/thermal.h>
  41 #include <linux/acpi.h>
  42 #include <linux/workqueue.h>
  43 #include <asm/uaccess.h>
  44
  45 #define PREFIX "ACPI: "
  46
  47 #define ACPI_THERMAL_CLASS              "thermal_zone"
  48 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  49 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  50 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  51 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  52 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  53 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  54 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  55
  56 #define ACPI_THERMAL_MAX_ACTIVE 10
  57 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  58
  59 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  60 ACPI_MODULE_NAME("thermal");
  61
  62 MODULE_AUTHOR("Paul Diefenbaugh");
  63 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static int act;
  67 module_param(act, int, 0644);
  68 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  69
  70 static int crt;
  71 module_param(crt, int, 0644);
  72 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  73
  74 static int tzp;
  75 module_param(tzp, int, 0444);
  76 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  77
  78 static int nocrt;
  79 module_param(nocrt, int, 0);
  80 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  81
  82 static int off;
  83 module_param(off, int, 0);
  84 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  85
  86 static int psv;
  87 module_param(psv, int, 0644);
  88 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  89
  90 static struct workqueue_struct *acpi_thermal_pm_queue;
  91
  92 static int acpi_thermal_add(struct acpi_device *device);
  93 static int acpi_thermal_remove(struct acpi_device *device);
  94 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
  95
  96 static const struct acpi_device_id  thermal_device_ids[] = {
  97         {ACPI_THERMAL_HID, 0},
  98         {"", 0},
  99 };
 100 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 101
 102 #ifdef CONFIG_PM_SLEEP
 103 static int acpi_thermal_suspend(struct device *dev);
 104 static int acpi_thermal_resume(struct device *dev);
 105 #else
 106 #define acpi_thermal_suspend NULL
 107 #define acpi_thermal_resume NULL
 108 #endif
 109 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
 110
 111 static struct acpi_driver acpi_thermal_driver = {
 112         .name = "thermal",
 113         .class = ACPI_THERMAL_CLASS,
 114         .ids = thermal_device_ids,
 115         .ops = {
 116                 .add = acpi_thermal_add,
 117                 .remove = acpi_thermal_remove,
 118                 .notify = acpi_thermal_notify,
 119                 },
 120         .drv.pm = &acpi_thermal_pm,
 121 };
 122
 123 struct acpi_thermal_state {
 124         u8 critical:1;
 125         u8 hot:1;
 126         u8 passive:1;
 127         u8 active:1;
 128         u8 reserved:4;
 129         int active_index;
 130 };
 131
 132 struct acpi_thermal_state_flags {
 133         u8 valid:1;
 134         u8 enabled:1;
 135         u8 reserved:6;
 136 };
 137
 138 struct acpi_thermal_critical {
 139         struct acpi_thermal_state_flags flags;
 140         unsigned long temperature;
 141 };
 142
 143 struct acpi_thermal_hot {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146 };
 147
 148 struct acpi_thermal_passive {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151         unsigned long tc1;
 152         unsigned long tc2;
 153         unsigned long tsp;
 154         struct acpi_handle_list devices;
 155 };
 156
 157 struct acpi_thermal_active {
 158         struct acpi_thermal_state_flags flags;
 159         unsigned long temperature;
 160         struct acpi_handle_list devices;
 161 };
 162
 163 struct acpi_thermal_trips {
 164         struct acpi_thermal_critical critical;
 165         struct acpi_thermal_hot hot;
 166         struct acpi_thermal_passive passive;
 167         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 168 };
 169
 170 struct acpi_thermal_flags {
 171         u8 cooling_mode:1;      /* _SCP */
 172         u8 devices:1;           /* _TZD */
 173         u8 reserved:6;
 174 };
 175
 176 struct acpi_thermal {
 177         struct acpi_device * device;
 178         acpi_bus_id name;
 179         unsigned long temperature;
 180         unsigned long last_temperature;
 181         unsigned long polling_frequency;
 182         volatile u8 zombie;
 183         struct acpi_thermal_flags flags;
 184         struct acpi_thermal_state state;
 185         struct acpi_thermal_trips trips;
 186         struct acpi_handle_list devices;
 187         struct thermal_zone_device *thermal_zone;
 188         int tz_enabled;
 189         int kelvin_offset;
 190         struct work_struct thermal_check_work;
 191         struct mutex thermal_check_lock;
 192         atomic_t thermal_check_count;
 193 };
 194
 195 /* --------------------------------------------------------------------------
 196                              Thermal Zone Management
 197    -------------------------------------------------------------------------- */
 198
 199 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 200 {
 201         acpi_status status = AE_OK;
 202         unsigned long long tmp;
 203
 204         if (!tz)
 205                 return -EINVAL;
 206
 207         tz->last_temperature = tz->temperature;
 208
 209         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 210         if (ACPI_FAILURE(status))
 211                 return -ENODEV;
 212
 213         tz->temperature = tmp;
 214         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 215                           tz->temperature));
 216
 217         return 0;
 218 }
 219
 220 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 221 {
 222         acpi_status status = AE_OK;
 223         unsigned long long tmp;
 224
 225         if (!tz)
 226                 return -EINVAL;
 227
 228         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 229         if (ACPI_FAILURE(status))
 230                 return -ENODEV;
 231
 232         tz->polling_frequency = tmp;
 233         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 234                           tz->polling_frequency));
 235
 236         return 0;
 237 }
 238
 239 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 240 {
 241         if (!tz)
 242                 return -EINVAL;
 243
 244         if (!acpi_has_method(tz->device->handle, "_SCP")) {
 245                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 246                 return -ENODEV;
 247         } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
 248                                                            "_SCP", mode))) {
 249                 return -ENODEV;
 250         }
 251
 252         return 0;
 253 }
 254
 255 #define ACPI_TRIPS_CRITICAL     0x01
 256 #define ACPI_TRIPS_HOT          0x02
 257 #define ACPI_TRIPS_PASSIVE      0x04
 258 #define ACPI_TRIPS_ACTIVE       0x08
 259 #define ACPI_TRIPS_DEVICES      0x10
 260
 261 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 262 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 263
 264 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 265                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 266                               ACPI_TRIPS_DEVICES)
 267
 268 /*
 269  * This exception is thrown out in two cases:
 270  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 271  *   when re-evaluating the AML code.
 272  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 273  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 274  */
 275 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 276 do {    \
 277         if (flags != ACPI_TRIPS_INIT)   \
 278                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 279                 "ACPI thermal trip point %s changed\n"  \
 280                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 281 } while (0)
 282
 283 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 284 {
 285         acpi_status status = AE_OK;
 286         unsigned long long tmp;
 287         struct acpi_handle_list devices;
 288         int valid = 0;
 289         int i;
 290
 291         /* Critical Shutdown */
 292         if (flag & ACPI_TRIPS_CRITICAL) {
 293                 status = acpi_evaluate_integer(tz->device->handle,
 294                                 "_CRT", NULL, &tmp);
 295                 tz->trips.critical.temperature = tmp;
 296                 /*
 297                  * Treat freezing temperatures as invalid as well; some
 298                  * BIOSes return really low values and cause reboots at startup.
 299                  * Below zero (Celsius) values clearly aren't right for sure..
 300                  * ... so lets discard those as invalid.
 301                  */
 302                 if (ACPI_FAILURE(status)) {
 303                         tz->trips.critical.flags.valid = 0;
 304                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 305                                           "No critical threshold\n"));
 306                 } else if (tmp <= 2732) {
 307                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
 308                                 tmp);
 309                         tz->trips.critical.flags.valid = 0;
 310                 } else {
 311                         tz->trips.critical.flags.valid = 1;
 312                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 313                                           "Found critical threshold [%lu]\n",
 314                                           tz->trips.critical.temperature));
 315                 }
 316                 if (tz->trips.critical.flags.valid == 1) {
 317                         if (crt == -1) {
 318                                 tz->trips.critical.flags.valid = 0;
 319                         } else if (crt > 0) {
 320                                 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
 321                                 /*
 322                                  * Allow override critical threshold
 323                                  */
 324                                 if (crt_k > tz->trips.critical.temperature)
 325                                         pr_warn(PREFIX "Critical threshold %d C\n",
 326                                                 crt);
 327                                 tz->trips.critical.temperature = crt_k;
 328                         }
 329                 }
 330         }
 331
 332         /* Critical Sleep (optional) */
 333         if (flag & ACPI_TRIPS_HOT) {
 334                 status = acpi_evaluate_integer(tz->device->handle,
 335                                 "_HOT", NULL, &tmp);
 336                 if (ACPI_FAILURE(status)) {
 337                         tz->trips.hot.flags.valid = 0;
 338                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 339                                         "No hot threshold\n"));
 340                 } else {
 341                         tz->trips.hot.temperature = tmp;
 342                         tz->trips.hot.flags.valid = 1;
 343                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 344                                         "Found hot threshold [%lu]\n",
 345                                         tz->trips.hot.temperature));
 346                 }
 347         }
 348
 349         /* Passive (optional) */
 350         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 351                 (flag == ACPI_TRIPS_INIT)) {
 352                 valid = tz->trips.passive.flags.valid;
 353                 if (psv == -1) {
 354                         status = AE_SUPPORT;
 355                 } else if (psv > 0) {
 356                         tmp = CELSIUS_TO_DECI_KELVIN(psv);
 357                         status = AE_OK;
 358                 } else {
 359                         status = acpi_evaluate_integer(tz->device->handle,
 360                                 "_PSV", NULL, &tmp);
 361                 }
 362
 363                 if (ACPI_FAILURE(status))
 364                         tz->trips.passive.flags.valid = 0;
 365                 else {
 366                         tz->trips.passive.temperature = tmp;
 367                         tz->trips.passive.flags.valid = 1;
 368                         if (flag == ACPI_TRIPS_INIT) {
 369                                 status = acpi_evaluate_integer(
 370                                                 tz->device->handle, "_TC1",
 371                                                 NULL, &tmp);
 372                                 if (ACPI_FAILURE(status))
 373                                         tz->trips.passive.flags.valid = 0;
 374                                 else
 375                                         tz->trips.passive.tc1 = tmp;
 376                                 status = acpi_evaluate_integer(
 377                                                 tz->device->handle, "_TC2",
 378                                                 NULL, &tmp);
 379                                 if (ACPI_FAILURE(status))
 380                                         tz->trips.passive.flags.valid = 0;
 381                                 else
 382                                         tz->trips.passive.tc2 = tmp;
 383                                 status = acpi_evaluate_integer(
 384                                                 tz->device->handle, "_TSP",
 385                                                 NULL, &tmp);
 386                                 if (ACPI_FAILURE(status))
 387                                         tz->trips.passive.flags.valid = 0;
 388                                 else
 389                                         tz->trips.passive.tsp = tmp;
 390                         }
 391                 }
 392         }
 393         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 394                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 395                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 396                                                         NULL, &devices);
 397                 if (ACPI_FAILURE(status)) {
 398                         pr_warn(PREFIX "Invalid passive threshold\n");
 399                         tz->trips.passive.flags.valid = 0;
 400                 }
 401                 else
 402                         tz->trips.passive.flags.valid = 1;
 403
 404                 if (memcmp(&tz->trips.passive.devices, &devices,
 405                                 sizeof(struct acpi_handle_list))) {
 406                         memcpy(&tz->trips.passive.devices, &devices,
 407                                 sizeof(struct acpi_handle_list));
 408                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 409                 }
 410         }
 411         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 412                 if (valid != tz->trips.passive.flags.valid)
 413                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 414         }
 415
 416         /* Active (optional) */
 417         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 418                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 419                 valid = tz->trips.active[i].flags.valid;
 420
 421                 if (act == -1)
 422                         break; /* disable all active trip points */
 423
 424                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 425                         tz->trips.active[i].flags.valid)) {
 426                         status = acpi_evaluate_integer(tz->device->handle,
 427                                                         name, NULL, &tmp);
 428                         if (ACPI_FAILURE(status)) {
 429                                 tz->trips.active[i].flags.valid = 0;
 430                                 if (i == 0)
 431                                         break;
 432                                 if (act <= 0)
 433                                         break;
 434                                 if (i == 1)
 435                                         tz->trips.active[0].temperature =
 436                                                 CELSIUS_TO_DECI_KELVIN(act);
 437                                 else
 438                                         /*
 439                                          * Don't allow override higher than
 440                                          * the next higher trip point
 441                                          */
 442                                         tz->trips.active[i - 1].temperature =
 443                                                 (tz->trips.active[i - 2].temperature <
 444                                                 CELSIUS_TO_DECI_KELVIN(act) ?
 445                                                 tz->trips.active[i - 2].temperature :
 446                                                 CELSIUS_TO_DECI_KELVIN(act));
 447                                 break;
 448                         } else {
 449                                 tz->trips.active[i].temperature = tmp;
 450                                 tz->trips.active[i].flags.valid = 1;
 451                         }
 452                 }
 453
 454                 name[2] = 'L';
 455                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 456                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 457                         status = acpi_evaluate_reference(tz->device->handle,
 458                                                 name, NULL, &devices);
 459                         if (ACPI_FAILURE(status)) {
 460                                 pr_warn(PREFIX "Invalid active%d threshold\n",
 461                                         i);
 462                                 tz->trips.active[i].flags.valid = 0;
 463                         }
 464                         else
 465                                 tz->trips.active[i].flags.valid = 1;
 466
 467                         if (memcmp(&tz->trips.active[i].devices, &devices,
 468                                         sizeof(struct acpi_handle_list))) {
 469                                 memcpy(&tz->trips.active[i].devices, &devices,
 470                                         sizeof(struct acpi_handle_list));
 471                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 472                         }
 473                 }
 474                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 475                         if (valid != tz->trips.active[i].flags.valid)
 476                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 477
 478                 if (!tz->trips.active[i].flags.valid)
 479                         break;
 480         }
 481
 482         if ((flag & ACPI_TRIPS_DEVICES)
 483             && acpi_has_method(tz->device->handle, "_TZD")) {
 484                 memset(&devices, 0, sizeof(devices));
 485                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 486                                                 NULL, &devices);
 487                 if (ACPI_SUCCESS(status)
 488                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
 489                         tz->devices = devices;
 490                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 491                 }
 492         }
 493
 494         return 0;
 495 }
 496
 497 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 498 {
 499         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 500
 501         if (ret)
 502                 return ret;
 503
 504         valid = tz->trips.critical.flags.valid |
 505                 tz->trips.hot.flags.valid |
 506                 tz->trips.passive.flags.valid;
 507
 508         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 509                 valid |= tz->trips.active[i].flags.valid;
 510
 511         if (!valid) {
 512                 pr_warn(FW_BUG "No valid trip found\n");
 513                 return -ENODEV;
 514         }
 515         return 0;
 516 }
 517
 518 /* sys I/F for generic thermal sysfs support */
 519
 520 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
 521 {
 522         struct acpi_thermal *tz = thermal->devdata;
 523         int result;
 524
 525         if (!tz)
 526                 return -EINVAL;
 527
 528         result = acpi_thermal_get_temperature(tz);
 529         if (result)
 530                 return result;
 531
 532         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
 533                                                         tz->kelvin_offset);
 534         return 0;
 535 }
 536
 537 static int thermal_get_mode(struct thermal_zone_device *thermal,
 538                                 enum thermal_device_mode *mode)
 539 {
 540         struct acpi_thermal *tz = thermal->devdata;
 541
 542         if (!tz)
 543                 return -EINVAL;
 544
 545         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 546                 THERMAL_DEVICE_DISABLED;
 547
 548         return 0;
 549 }
 550
 551 static void acpi_thermal_check_fn(struct work_struct *work);
 552
 553 static int thermal_set_mode(struct thermal_zone_device *thermal,
 554                                 enum thermal_device_mode mode)
 555 {
 556         struct acpi_thermal *tz = thermal->devdata;
 557         int enable;
 558
 559         if (!tz)
 560                 return -EINVAL;
 561
 562         /*
 563          * enable/disable thermal management from ACPI thermal driver
 564          */
 565         if (mode == THERMAL_DEVICE_ENABLED)
 566                 enable = 1;
 567         else if (mode == THERMAL_DEVICE_DISABLED) {
 568                 enable = 0;
 569                 pr_warn("thermal zone will be disabled\n");
 570         } else
 571                 return -EINVAL;
 572
 573         if (enable != tz->tz_enabled) {
 574                 tz->tz_enabled = enable;
 575                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 576                         "%s kernel ACPI thermal control\n",
 577                         tz->tz_enabled ? "Enable" : "Disable"));
 578                 acpi_thermal_check_fn(&tz->thermal_check_work);
 579         }
 580         return 0;
 581 }
 582
 583 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 584                                  int trip, enum thermal_trip_type *type)
 585 {
 586         struct acpi_thermal *tz = thermal->devdata;
 587         int i;
 588
 589         if (!tz || trip < 0)
 590                 return -EINVAL;
 591
 592         if (tz->trips.critical.flags.valid) {
 593                 if (!trip) {
 594                         *type = THERMAL_TRIP_CRITICAL;
 595                         return 0;
 596                 }
 597                 trip--;
 598         }
 599
 600         if (tz->trips.hot.flags.valid) {
 601                 if (!trip) {
 602                         *type = THERMAL_TRIP_HOT;
 603                         return 0;
 604                 }
 605                 trip--;
 606         }
 607
 608         if (tz->trips.passive.flags.valid) {
 609                 if (!trip) {
 610                         *type = THERMAL_TRIP_PASSIVE;
 611                         return 0;
 612                 }
 613                 trip--;
 614         }
 615
 616         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 617                 tz->trips.active[i].flags.valid; i++) {
 618                 if (!trip) {
 619                         *type = THERMAL_TRIP_ACTIVE;
 620                         return 0;
 621                 }
 622                 trip--;
 623         }
 624
 625         return -EINVAL;
 626 }
 627
 628 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 629                                  int trip, int *temp)
 630 {
 631         struct acpi_thermal *tz = thermal->devdata;
 632         int i;
 633
 634         if (!tz || trip < 0)
 635                 return -EINVAL;
 636
 637         if (tz->trips.critical.flags.valid) {
 638                 if (!trip) {
 639                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 640                                 tz->trips.critical.temperature,
 641                                 tz->kelvin_offset);
 642                         return 0;
 643                 }
 644                 trip--;
 645         }
 646
 647         if (tz->trips.hot.flags.valid) {
 648                 if (!trip) {
 649                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 650                                 tz->trips.hot.temperature,
 651                                 tz->kelvin_offset);
 652                         return 0;
 653                 }
 654                 trip--;
 655         }
 656
 657         if (tz->trips.passive.flags.valid) {
 658                 if (!trip) {
 659                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 660                                 tz->trips.passive.temperature,
 661                                 tz->kelvin_offset);
 662                         return 0;
 663                 }
 664                 trip--;
 665         }
 666
 667         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 668                 tz->trips.active[i].flags.valid; i++) {
 669                 if (!trip) {
 670                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 671                                 tz->trips.active[i].temperature,
 672                                 tz->kelvin_offset);
 673                         return 0;
 674                 }
 675                 trip--;
 676         }
 677
 678         return -EINVAL;
 679 }
 680
 681 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 682                                 int *temperature)
 683 {
 684         struct acpi_thermal *tz = thermal->devdata;
 685
 686         if (tz->trips.critical.flags.valid) {
 687                 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 688                                 tz->trips.critical.temperature,
 689                                 tz->kelvin_offset);
 690                 return 0;
 691         } else
 692                 return -EINVAL;
 693 }
 694
 695 static int thermal_get_trend(struct thermal_zone_device *thermal,
 696                                 int trip, enum thermal_trend *trend)
 697 {
 698         struct acpi_thermal *tz = thermal->devdata;
 699         enum thermal_trip_type type;
 700         int i;
 701
 702         if (thermal_get_trip_type(thermal, trip, &type))
 703                 return -EINVAL;
 704
 705         if (type == THERMAL_TRIP_ACTIVE) {
 706                 int trip_temp;
 707                 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
 708                                         tz->temperature, tz->kelvin_offset);
 709                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 710                         return -EINVAL;
 711
 712                 if (temp > trip_temp) {
 713                         *trend = THERMAL_TREND_RAISING;
 714                         return 0;
 715                 } else {
 716                         /* Fall back on default trend */
 717                         return -EINVAL;
 718                 }
 719         }
 720
 721         /*
 722          * tz->temperature has already been updated by generic thermal layer,
 723          * before this callback being invoked
 724          */
 725         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 726                 + (tz->trips.passive.tc2
 727                 * (tz->temperature - tz->trips.passive.temperature));
 728
 729         if (i > 0)
 730                 *trend = THERMAL_TREND_RAISING;
 731         else if (i < 0)
 732                 *trend = THERMAL_TREND_DROPPING;
 733         else
 734                 *trend = THERMAL_TREND_STABLE;
 735         return 0;
 736 }
 737
 738
 739 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 740                            enum thermal_trip_type trip_type)
 741 {
 742         u8 type = 0;
 743         struct acpi_thermal *tz = thermal->devdata;
 744
 745         if (trip_type == THERMAL_TRIP_CRITICAL)
 746                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 747         else if (trip_type == THERMAL_TRIP_HOT)
 748                 type = ACPI_THERMAL_NOTIFY_HOT;
 749         else
 750                 return 0;
 751
 752         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 753                                         dev_name(&tz->device->dev), type, 1);
 754
 755         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 756                 return 1;
 757
 758         return 0;
 759 }
 760
 761 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 762                                         struct thermal_cooling_device *cdev,
 763                                         bool bind)
 764 {
 765         struct acpi_device *device = cdev->devdata;
 766         struct acpi_thermal *tz = thermal->devdata;
 767         struct acpi_device *dev;
 768         acpi_status status;
 769         acpi_handle handle;
 770         int i;
 771         int j;
 772         int trip = -1;
 773         int result = 0;
 774
 775         if (tz->trips.critical.flags.valid)
 776                 trip++;
 777
 778         if (tz->trips.hot.flags.valid)
 779                 trip++;
 780
 781         if (tz->trips.passive.flags.valid) {
 782                 trip++;
 783                 for (i = 0; i < tz->trips.passive.devices.count;
 784                     i++) {
 785                         handle = tz->trips.passive.devices.handles[i];
 786                         status = acpi_bus_get_device(handle, &dev);
 787                         if (ACPI_FAILURE(status) || dev != device)
 788                                 continue;
 789                         if (bind)
 790                                 result =
 791                                         thermal_zone_bind_cooling_device
 792                                         (thermal, trip, cdev,
 793                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 794                                          THERMAL_WEIGHT_DEFAULT);
 795                         else
 796                                 result =
 797                                         thermal_zone_unbind_cooling_device
 798                                         (thermal, trip, cdev);
 799                         if (result)
 800                                 goto failed;
 801                 }
 802         }
 803
 804         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 805                 if (!tz->trips.active[i].flags.valid)
 806                         break;
 807                 trip++;
 808                 for (j = 0;
 809                     j < tz->trips.active[i].devices.count;
 810                     j++) {
 811                         handle = tz->trips.active[i].devices.handles[j];
 812                         status = acpi_bus_get_device(handle, &dev);
 813                         if (ACPI_FAILURE(status) || dev != device)
 814                                 continue;
 815                         if (bind)
 816                                 result = thermal_zone_bind_cooling_device
 817                                         (thermal, trip, cdev,
 818                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 819                                          THERMAL_WEIGHT_DEFAULT);
 820                         else
 821                                 result = thermal_zone_unbind_cooling_device
 822                                         (thermal, trip, cdev);
 823                         if (result)
 824                                 goto failed;
 825                 }
 826         }
 827
 828         for (i = 0; i < tz->devices.count; i++) {
 829                 handle = tz->devices.handles[i];
 830                 status = acpi_bus_get_device(handle, &dev);
 831                 if (ACPI_SUCCESS(status) && (dev == device)) {
 832                         if (bind)
 833                                 result = thermal_zone_bind_cooling_device
 834                                                 (thermal, THERMAL_TRIPS_NONE,
 835                                                  cdev, THERMAL_NO_LIMIT,
 836                                                  THERMAL_NO_LIMIT,
 837                                                  THERMAL_WEIGHT_DEFAULT);
 838                         else
 839                                 result = thermal_zone_unbind_cooling_device
 840                                                 (thermal, THERMAL_TRIPS_NONE,
 841                                                  cdev);
 842                         if (result)
 843                                 goto failed;
 844                 }
 845         }
 846
 847 failed:
 848         return result;
 849 }
 850
 851 static int
 852 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 853                                         struct thermal_cooling_device *cdev)
 854 {
 855         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 856 }
 857
 858 static int
 859 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 860                                         struct thermal_cooling_device *cdev)
 861 {
 862         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 863 }
 864
 865 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 866         .bind = acpi_thermal_bind_cooling_device,
 867         .unbind = acpi_thermal_unbind_cooling_device,
 868         .get_temp = thermal_get_temp,
 869         .get_mode = thermal_get_mode,
 870         .set_mode = thermal_set_mode,
 871         .get_trip_type = thermal_get_trip_type,
 872         .get_trip_temp = thermal_get_trip_temp,
 873         .get_crit_temp = thermal_get_crit_temp,
 874         .get_trend = thermal_get_trend,
 875         .notify = thermal_notify,
 876 };
 877
 878 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 879 {
 880         int trips = 0;
 881         int result;
 882         acpi_status status;
 883         int i;
 884
 885         if (tz->trips.critical.flags.valid)
 886                 trips++;
 887
 888         if (tz->trips.hot.flags.valid)
 889                 trips++;
 890
 891         if (tz->trips.passive.flags.valid)
 892                 trips++;
 893
 894         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 895                         tz->trips.active[i].flags.valid; i++, trips++);
 896
 897         if (tz->trips.passive.flags.valid)
 898                 tz->thermal_zone =
 899                         thermal_zone_device_register("acpitz", trips, 0, tz,
 900                                                 &acpi_thermal_zone_ops, NULL,
 901                                                      tz->trips.passive.tsp*100,
 902                                                      tz->polling_frequency*100);
 903         else
 904                 tz->thermal_zone =
 905                         thermal_zone_device_register("acpitz", trips, 0, tz,
 906                                                 &acpi_thermal_zone_ops, NULL,
 907                                                 0, tz->polling_frequency*100);
 908         if (IS_ERR(tz->thermal_zone))
 909                 return -ENODEV;
 910
 911         result = sysfs_create_link(&tz->device->dev.kobj,
 912                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 913         if (result)
 914                 return result;
 915
 916         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 917                                    &tz->device->dev.kobj, "device");
 918         if (result)
 919                 return result;
 920
 921         status =  acpi_bus_attach_private_data(tz->device->handle,
 922                                                tz->thermal_zone);
 923         if (ACPI_FAILURE(status))
 924                 return -ENODEV;
 925
 926         tz->tz_enabled = 1;
 927
 928         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 929                  tz->thermal_zone->id);
 930         return 0;
 931 }
 932
 933 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 934 {
 935         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 936         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 937         thermal_zone_device_unregister(tz->thermal_zone);
 938         tz->thermal_zone = NULL;
 939         acpi_bus_detach_private_data(tz->device->handle);
 940 }
 941
 942
 943 /* --------------------------------------------------------------------------
 944                                  Driver Interface
 945    -------------------------------------------------------------------------- */
 946
 947 static void acpi_queue_thermal_check(struct acpi_thermal *tz)
 948 {
 949         if (!work_pending(&tz->thermal_check_work))
 950                 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
 951 }
 952
 953 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 954 {
 955         struct acpi_thermal *tz = acpi_driver_data(device);
 956
 957
 958         if (!tz)
 959                 return;
 960
 961         switch (event) {
 962         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 963                 acpi_queue_thermal_check(tz);
 964                 break;
 965         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 966                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 967                 acpi_queue_thermal_check(tz);
 968                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 969                                                   dev_name(&device->dev), event, 0);
 970                 break;
 971         case ACPI_THERMAL_NOTIFY_DEVICES:
 972                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 973                 acpi_queue_thermal_check(tz);
 974                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 975                                                   dev_name(&device->dev), event, 0);
 976                 break;
 977         default:
 978                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 979                                   "Unsupported event [0x%x]\n", event));
 980                 break;
 981         }
 982 }
 983
 984 /*
 985  * On some platforms, the AML code has dependency about
 986  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 987  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 988  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 989  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 990  *    if _TMP has never been evaluated.
 991  *
 992  * As this dependency is totally transparent to OS, evaluate
 993  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
 994  * _TMP, before they are actually used.
 995  */
 996 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 997 {
 998         acpi_handle handle = tz->device->handle;
 999         unsigned long long value;
1000         int i;
1001
1002         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1003         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1004         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1005         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1006                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1007                 acpi_status status;
1008
1009                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1010                 if (status == AE_NOT_FOUND)
1011                         break;
1012         }
1013         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1014 }
1015
1016 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1017 {
1018         int result = 0;
1019
1020
1021         if (!tz)
1022                 return -EINVAL;
1023
1024         acpi_thermal_aml_dependency_fix(tz);
1025
1026         /* Get trip points [_CRT, _PSV, etc.] (required) */
1027         result = acpi_thermal_get_trip_points(tz);
1028         if (result)
1029                 return result;
1030
1031         /* Get temperature [_TMP] (required) */
1032         result = acpi_thermal_get_temperature(tz);
1033         if (result)
1034                 return result;
1035
1036         /* Set the cooling mode [_SCP] to active cooling (default) */
1037         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1038         if (!result)
1039                 tz->flags.cooling_mode = 1;
1040
1041         /* Get default polling frequency [_TZP] (optional) */
1042         if (tzp)
1043                 tz->polling_frequency = tzp;
1044         else
1045                 acpi_thermal_get_polling_frequency(tz);
1046
1047         return 0;
1048 }
1049
1050 /*
1051  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1052  * handles temperature values with a single decimal place. As a consequence,
1053  * some implementations use an offset of 273.1 and others use an offset of
1054  * 273.2. Try to find out which one is being used, to present the most
1055  * accurate and visually appealing number.
1056  *
1057  * The heuristic below should work for all ACPI thermal zones which have a
1058  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1059  */
1060 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1061 {
1062         if (tz->trips.critical.flags.valid &&
1063             (tz->trips.critical.temperature % 5) == 1)
1064                 tz->kelvin_offset = 2731;
1065         else
1066                 tz->kelvin_offset = 2732;
1067 }
1068
1069 static void acpi_thermal_check_fn(struct work_struct *work)
1070 {
1071         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1072                                                thermal_check_work);
1073
1074         if (!tz->tz_enabled)
1075                 return;
1076         /*
1077          * In general, it is not sufficient to check the pending bit, because
1078          * subsequent instances of this function may be queued after one of them
1079          * has started running (e.g. if _TMP sleeps).  Avoid bailing out if just
1080          * one of them is running, though, because it may have done the actual
1081          * check some time ago, so allow at least one of them to block on the
1082          * mutex while another one is running the update.
1083          */
1084         if (!atomic_add_unless(&tz->thermal_check_count, -1, 1))
1085                 return;
1086
1087         mutex_lock(&tz->thermal_check_lock);
1088
1089         thermal_zone_device_update(tz->thermal_zone);
1090
1091         atomic_inc(&tz->thermal_check_count);
1092
1093         mutex_unlock(&tz->thermal_check_lock);
1094 }
1095
1096 static int acpi_thermal_add(struct acpi_device *device)
1097 {
1098         int result = 0;
1099         struct acpi_thermal *tz = NULL;
1100
1101
1102         if (!device)
1103                 return -EINVAL;
1104
1105         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1106         if (!tz)
1107                 return -ENOMEM;
1108
1109         tz->device = device;
1110         strcpy(tz->name, device->pnp.bus_id);
1111         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1112         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1113         device->driver_data = tz;
1114
1115         result = acpi_thermal_get_info(tz);
1116         if (result)
1117                 goto free_memory;
1118
1119         acpi_thermal_guess_offset(tz);
1120
1121         result = acpi_thermal_register_thermal_zone(tz);
1122         if (result)
1123                 goto free_memory;
1124
1125         atomic_set(&tz->thermal_check_count, 3);
1126         mutex_init(&tz->thermal_check_lock);
1127         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1128
1129         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1130                 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1131         goto end;
1132
1133 free_memory:
1134         kfree(tz);
1135 end:
1136         return result;
1137 }
1138
1139 static int acpi_thermal_remove(struct acpi_device *device)
1140 {
1141         struct acpi_thermal *tz = NULL;
1142
1143         if (!device || !acpi_driver_data(device))
1144                 return -EINVAL;
1145
1146         flush_workqueue(acpi_thermal_pm_queue);
1147         tz = acpi_driver_data(device);
1148
1149         acpi_thermal_unregister_thermal_zone(tz);
1150         kfree(tz);
1151         return 0;
1152 }
1153
1154 #ifdef CONFIG_PM_SLEEP
1155 static int acpi_thermal_suspend(struct device *dev)
1156 {
1157         /* Make sure the previously queued thermal check work has been done */
1158         flush_workqueue(acpi_thermal_pm_queue);
1159         return 0;
1160 }
1161
1162 static int acpi_thermal_resume(struct device *dev)
1163 {
1164         struct acpi_thermal *tz;
1165         int i, j, power_state, result;
1166
1167         if (!dev)
1168                 return -EINVAL;
1169
1170         tz = acpi_driver_data(to_acpi_device(dev));
1171         if (!tz)
1172                 return -EINVAL;
1173
1174         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1175                 if (!(&tz->trips.active[i]))
1176                         break;
1177                 if (!tz->trips.active[i].flags.valid)
1178                         break;
1179                 tz->trips.active[i].flags.enabled = 1;
1180                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1181                         result = acpi_bus_update_power(
1182                                         tz->trips.active[i].devices.handles[j],
1183                                         &power_state);
1184                         if (result || (power_state != ACPI_STATE_D0)) {
1185                                 tz->trips.active[i].flags.enabled = 0;
1186                                 break;
1187                         }
1188                 }
1189                 tz->state.active |= tz->trips.active[i].flags.enabled;
1190         }
1191
1192         acpi_queue_thermal_check(tz);
1193
1194         return AE_OK;
1195 }
1196 #endif
1197
1198 static int thermal_act(const struct dmi_system_id *d) {
1199
1200         if (act == 0) {
1201                 pr_notice(PREFIX "%s detected: "
1202                           "disabling all active thermal trip points\n", d->ident);
1203                 act = -1;
1204         }
1205         return 0;
1206 }
1207 static int thermal_nocrt(const struct dmi_system_id *d) {
1208
1209         pr_notice(PREFIX "%s detected: "
1210                   "disabling all critical thermal trip point actions.\n", d->ident);
1211         nocrt = 1;
1212         return 0;
1213 }
1214 static int thermal_tzp(const struct dmi_system_id *d) {
1215
1216         if (tzp == 0) {
1217                 pr_notice(PREFIX "%s detected: "
1218                           "enabling thermal zone polling\n", d->ident);
1219                 tzp = 300;      /* 300 dS = 30 Seconds */
1220         }
1221         return 0;
1222 }
1223 static int thermal_psv(const struct dmi_system_id *d) {
1224
1225         if (psv == 0) {
1226                 pr_notice(PREFIX "%s detected: "
1227                           "disabling all passive thermal trip points\n", d->ident);
1228                 psv = -1;
1229         }
1230         return 0;
1231 }
1232
1233 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1234         /*
1235          * Award BIOS on this AOpen makes thermal control almost worthless.
1236          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1237          */
1238         {
1239          .callback = thermal_act,
1240          .ident = "AOpen i915GMm-HFS",
1241          .matches = {
1242                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1243                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1244                 },
1245         },
1246         {
1247          .callback = thermal_psv,
1248          .ident = "AOpen i915GMm-HFS",
1249          .matches = {
1250                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1251                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1252                 },
1253         },
1254         {
1255          .callback = thermal_tzp,
1256          .ident = "AOpen i915GMm-HFS",
1257          .matches = {
1258                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1259                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1260                 },
1261         },
1262         {
1263          .callback = thermal_nocrt,
1264          .ident = "Gigabyte GA-7ZX",
1265          .matches = {
1266                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1267                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1268                 },
1269         },
1270         {}
1271 };
1272
1273 static int __init acpi_thermal_init(void)
1274 {
1275         int result = 0;
1276
1277         dmi_check_system(thermal_dmi_table);
1278
1279         if (off) {
1280                 pr_notice(PREFIX "thermal control disabled\n");
1281                 return -ENODEV;
1282         }
1283
1284         acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1285         if (!acpi_thermal_pm_queue)
1286                 return -ENODEV;
1287
1288         result = acpi_bus_register_driver(&acpi_thermal_driver);
1289         if (result < 0) {
1290                 destroy_workqueue(acpi_thermal_pm_queue);
1291                 return -ENODEV;
1292         }
1293
1294         return 0;
1295 }
1296
1297 static void __exit acpi_thermal_exit(void)
1298 {
1299         acpi_bus_unregister_driver(&acpi_thermal_driver);
1300         destroy_workqueue(acpi_thermal_pm_queue);
1301
1302         return;
1303 }
1304
1305 module_init(acpi_thermal_init);
1306 module_exit(acpi_thermal_exit);