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_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  69 ACPI_MODULE_NAME("thermal");
  70
  71 MODULE_AUTHOR("Paul Diefenbaugh");
  72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  73 MODULE_LICENSE("GPL");
  74
  75 static int act;
  76 module_param(act, int, 0644);
  77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  78
  79 static int crt;
  80 module_param(crt, int, 0644);
  81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  82
  83 static int tzp;
  84 module_param(tzp, int, 0444);
  85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  86
  87 static int nocrt;
  88 module_param(nocrt, int, 0);
  89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  90
  91 static int off;
  92 module_param(off, int, 0);
  93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  94
  95 static int psv;
  96 module_param(psv, int, 0644);
  97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  98
  99 static int acpi_thermal_add(struct acpi_device *device);
 100 static int acpi_thermal_remove(struct acpi_device *device, int type);
 101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 102
 103 static const struct acpi_device_id  thermal_device_ids[] = {
 104         {ACPI_THERMAL_HID, 0},
 105         {"", 0},
 106 };
 107 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 108
 109 static int acpi_thermal_resume(struct device *dev);
 110 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
 111
 112 static struct acpi_driver acpi_thermal_driver = {
 113         .name = "thermal",
 114         .class = ACPI_THERMAL_CLASS,
 115         .ids = thermal_device_ids,
 116         .ops = {
 117                 .add = acpi_thermal_add,
 118                 .remove = acpi_thermal_remove,
 119                 .notify = acpi_thermal_notify,
 120                 },
 121         .drv.pm = &acpi_thermal_pm,
 122 };
 123
 124 struct acpi_thermal_state {
 125         u8 critical:1;
 126         u8 hot:1;
 127         u8 passive:1;
 128         u8 active:1;
 129         u8 reserved:4;
 130         int active_index;
 131 };
 132
 133 struct acpi_thermal_state_flags {
 134         u8 valid:1;
 135         u8 enabled:1;
 136         u8 reserved:6;
 137 };
 138
 139 struct acpi_thermal_critical {
 140         struct acpi_thermal_state_flags flags;
 141         unsigned long temperature;
 142 };
 143
 144 struct acpi_thermal_hot {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147 };
 148
 149 struct acpi_thermal_passive {
 150         struct acpi_thermal_state_flags flags;
 151         unsigned long temperature;
 152         unsigned long tc1;
 153         unsigned long tc2;
 154         unsigned long tsp;
 155         struct acpi_handle_list devices;
 156 };
 157
 158 struct acpi_thermal_active {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         struct acpi_handle_list devices;
 162 };
 163
 164 struct acpi_thermal_trips {
 165         struct acpi_thermal_critical critical;
 166         struct acpi_thermal_hot hot;
 167         struct acpi_thermal_passive passive;
 168         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 169 };
 170
 171 struct acpi_thermal_flags {
 172         u8 cooling_mode:1;      /* _SCP */
 173         u8 devices:1;           /* _TZD */
 174         u8 reserved:6;
 175 };
 176
 177 struct acpi_thermal {
 178         struct acpi_device * device;
 179         acpi_bus_id name;
 180         unsigned long temperature;
 181         unsigned long last_temperature;
 182         unsigned long polling_frequency;
 183         volatile u8 zombie;
 184         struct acpi_thermal_flags flags;
 185         struct acpi_thermal_state state;
 186         struct acpi_thermal_trips trips;
 187         struct acpi_handle_list devices;
 188         struct thermal_zone_device *thermal_zone;
 189         int tz_enabled;
 190         int kelvin_offset;
 191         struct mutex lock;
 192 };
 193
 194 /* --------------------------------------------------------------------------
 195                              Thermal Zone Management
 196    -------------------------------------------------------------------------- */
 197
 198 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 199 {
 200         acpi_status status = AE_OK;
 201         unsigned long long tmp;
 202
 203         if (!tz)
 204                 return -EINVAL;
 205
 206         tz->last_temperature = tz->temperature;
 207
 208         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 209         if (ACPI_FAILURE(status))
 210                 return -ENODEV;
 211
 212         tz->temperature = tmp;
 213         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 214                           tz->temperature));
 215
 216         return 0;
 217 }
 218
 219 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 220 {
 221         acpi_status status = AE_OK;
 222         unsigned long long tmp;
 223
 224         if (!tz)
 225                 return -EINVAL;
 226
 227         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 228         if (ACPI_FAILURE(status))
 229                 return -ENODEV;
 230
 231         tz->polling_frequency = tmp;
 232         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 233                           tz->polling_frequency));
 234
 235         return 0;
 236 }
 237
 238 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 239 {
 240         acpi_status status = AE_OK;
 241         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 242         struct acpi_object_list arg_list = { 1, &arg0 };
 243         acpi_handle handle = NULL;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 250         if (ACPI_FAILURE(status)) {
 251                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 252                 return -ENODEV;
 253         }
 254
 255         arg0.integer.value = mode;
 256
 257         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 258         if (ACPI_FAILURE(status))
 259                 return -ENODEV;
 260
 261         return 0;
 262 }
 263
 264 #define ACPI_TRIPS_CRITICAL     0x01
 265 #define ACPI_TRIPS_HOT          0x02
 266 #define ACPI_TRIPS_PASSIVE      0x04
 267 #define ACPI_TRIPS_ACTIVE       0x08
 268 #define ACPI_TRIPS_DEVICES      0x10
 269
 270 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 271 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 272
 273 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 274                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 275                               ACPI_TRIPS_DEVICES)
 276
 277 /*
 278  * This exception is thrown out in two cases:
 279  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 280  *   when re-evaluating the AML code.
 281  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 282  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 283  */
 284 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 285 do {    \
 286         if (flags != ACPI_TRIPS_INIT)   \
 287                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 288                 "ACPI thermal trip point %s changed\n"  \
 289                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 290 } while (0)
 291
 292 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 293 {
 294         acpi_status status = AE_OK;
 295         unsigned long long tmp;
 296         struct acpi_handle_list devices;
 297         int valid = 0;
 298         int i;
 299
 300         /* Critical Shutdown */
 301         if (flag & ACPI_TRIPS_CRITICAL) {
 302                 status = acpi_evaluate_integer(tz->device->handle,
 303                                 "_CRT", NULL, &tmp);
 304                 tz->trips.critical.temperature = tmp;
 305                 /*
 306                  * Treat freezing temperatures as invalid as well; some
 307                  * BIOSes return really low values and cause reboots at startup.
 308                  * Below zero (Celsius) values clearly aren't right for sure..
 309                  * ... so lets discard those as invalid.
 310                  */
 311                 if (ACPI_FAILURE(status)) {
 312                         tz->trips.critical.flags.valid = 0;
 313                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 314                                           "No critical threshold\n"));
 315                 } else if (tmp <= 2732) {
 316                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 317                                "(%llu)\n", tmp);
 318                         tz->trips.critical.flags.valid = 0;
 319                 } else {
 320                         tz->trips.critical.flags.valid = 1;
 321                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 322                                           "Found critical threshold [%lu]\n",
 323                                           tz->trips.critical.temperature));
 324                 }
 325                 if (tz->trips.critical.flags.valid == 1) {
 326                         if (crt == -1) {
 327                                 tz->trips.critical.flags.valid = 0;
 328                         } else if (crt > 0) {
 329                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 330                                 /*
 331                                  * Allow override critical threshold
 332                                  */
 333                                 if (crt_k > tz->trips.critical.temperature)
 334                                         printk(KERN_WARNING PREFIX
 335                                                 "Critical threshold %d C\n", crt);
 336                                 tz->trips.critical.temperature = crt_k;
 337                         }
 338                 }
 339         }
 340
 341         /* Critical Sleep (optional) */
 342         if (flag & ACPI_TRIPS_HOT) {
 343                 status = acpi_evaluate_integer(tz->device->handle,
 344                                 "_HOT", NULL, &tmp);
 345                 if (ACPI_FAILURE(status)) {
 346                         tz->trips.hot.flags.valid = 0;
 347                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 348                                         "No hot threshold\n"));
 349                 } else {
 350                         tz->trips.hot.temperature = tmp;
 351                         tz->trips.hot.flags.valid = 1;
 352                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 353                                         "Found hot threshold [%lu]\n",
 354                                         tz->trips.critical.temperature));
 355                 }
 356         }
 357
 358         /* Passive (optional) */
 359         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 360                 (flag == ACPI_TRIPS_INIT)) {
 361                 valid = tz->trips.passive.flags.valid;
 362                 if (psv == -1) {
 363                         status = AE_SUPPORT;
 364                 } else if (psv > 0) {
 365                         tmp = CELSIUS_TO_KELVIN(psv);
 366                         status = AE_OK;
 367                 } else {
 368                         status = acpi_evaluate_integer(tz->device->handle,
 369                                 "_PSV", NULL, &tmp);
 370                 }
 371
 372                 if (ACPI_FAILURE(status))
 373                         tz->trips.passive.flags.valid = 0;
 374                 else {
 375                         tz->trips.passive.temperature = tmp;
 376                         tz->trips.passive.flags.valid = 1;
 377                         if (flag == ACPI_TRIPS_INIT) {
 378                                 status = acpi_evaluate_integer(
 379                                                 tz->device->handle, "_TC1",
 380                                                 NULL, &tmp);
 381                                 if (ACPI_FAILURE(status))
 382                                         tz->trips.passive.flags.valid = 0;
 383                                 else
 384                                         tz->trips.passive.tc1 = tmp;
 385                                 status = acpi_evaluate_integer(
 386                                                 tz->device->handle, "_TC2",
 387                                                 NULL, &tmp);
 388                                 if (ACPI_FAILURE(status))
 389                                         tz->trips.passive.flags.valid = 0;
 390                                 else
 391                                         tz->trips.passive.tc2 = tmp;
 392                                 status = acpi_evaluate_integer(
 393                                                 tz->device->handle, "_TSP",
 394                                                 NULL, &tmp);
 395                                 if (ACPI_FAILURE(status))
 396                                         tz->trips.passive.flags.valid = 0;
 397                                 else
 398                                         tz->trips.passive.tsp = tmp;
 399                         }
 400                 }
 401         }
 402         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 403                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 404                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 405                                                         NULL, &devices);
 406                 if (ACPI_FAILURE(status)) {
 407                         printk(KERN_WARNING PREFIX
 408                                 "Invalid passive threshold\n");
 409                         tz->trips.passive.flags.valid = 0;
 410                 }
 411                 else
 412                         tz->trips.passive.flags.valid = 1;
 413
 414                 if (memcmp(&tz->trips.passive.devices, &devices,
 415                                 sizeof(struct acpi_handle_list))) {
 416                         memcpy(&tz->trips.passive.devices, &devices,
 417                                 sizeof(struct acpi_handle_list));
 418                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 419                 }
 420         }
 421         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 422                 if (valid != tz->trips.passive.flags.valid)
 423                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 424         }
 425
 426         /* Active (optional) */
 427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 428                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 429                 valid = tz->trips.active[i].flags.valid;
 430
 431                 if (act == -1)
 432                         break; /* disable all active trip points */
 433
 434                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 435                         tz->trips.active[i].flags.valid)) {
 436                         status = acpi_evaluate_integer(tz->device->handle,
 437                                                         name, NULL, &tmp);
 438                         if (ACPI_FAILURE(status)) {
 439                                 tz->trips.active[i].flags.valid = 0;
 440                                 if (i == 0)
 441                                         break;
 442                                 if (act <= 0)
 443                                         break;
 444                                 if (i == 1)
 445                                         tz->trips.active[0].temperature =
 446                                                 CELSIUS_TO_KELVIN(act);
 447                                 else
 448                                         /*
 449                                          * Don't allow override higher than
 450                                          * the next higher trip point
 451                                          */
 452                                         tz->trips.active[i - 1].temperature =
 453                                                 (tz->trips.active[i - 2].temperature <
 454                                                 CELSIUS_TO_KELVIN(act) ?
 455                                                 tz->trips.active[i - 2].temperature :
 456                                                 CELSIUS_TO_KELVIN(act));
 457                                 break;
 458                         } else {
 459                                 tz->trips.active[i].temperature = tmp;
 460                                 tz->trips.active[i].flags.valid = 1;
 461                         }
 462                 }
 463
 464                 name[2] = 'L';
 465                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 466                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 467                         status = acpi_evaluate_reference(tz->device->handle,
 468                                                 name, NULL, &devices);
 469                         if (ACPI_FAILURE(status)) {
 470                                 printk(KERN_WARNING PREFIX
 471                                         "Invalid active%d threshold\n", i);
 472                                 tz->trips.active[i].flags.valid = 0;
 473                         }
 474                         else
 475                                 tz->trips.active[i].flags.valid = 1;
 476
 477                         if (memcmp(&tz->trips.active[i].devices, &devices,
 478                                         sizeof(struct acpi_handle_list))) {
 479                                 memcpy(&tz->trips.active[i].devices, &devices,
 480                                         sizeof(struct acpi_handle_list));
 481                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 482                         }
 483                 }
 484                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 485                         if (valid != tz->trips.active[i].flags.valid)
 486                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 487
 488                 if (!tz->trips.active[i].flags.valid)
 489                         break;
 490         }
 491
 492         if (flag & ACPI_TRIPS_DEVICES) {
 493                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 494                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 495                                                 NULL, &devices);
 496                 if (memcmp(&tz->devices, &devices,
 497                                 sizeof(struct acpi_handle_list))) {
 498                         memcpy(&tz->devices, &devices,
 499                                 sizeof(struct acpi_handle_list));
 500                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 501                 }
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 508 {
 509         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 510
 511         if (ret)
 512                 return ret;
 513
 514         valid = tz->trips.critical.flags.valid |
 515                 tz->trips.hot.flags.valid |
 516                 tz->trips.passive.flags.valid;
 517
 518         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 519                 valid |= tz->trips.active[i].flags.valid;
 520
 521         if (!valid) {
 522                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 523                 return -ENODEV;
 524         }
 525         return 0;
 526 }
 527
 528 static void acpi_thermal_check(void *data)
 529 {
 530         struct acpi_thermal *tz = data;
 531
 532         thermal_zone_device_update(tz->thermal_zone);
 533 }
 534
 535 /* sys I/F for generic thermal sysfs support */
 536 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 537
 538 static int thermal_get_temp(struct thermal_zone_device *thermal,
 539                             unsigned long *temp)
 540 {
 541         struct acpi_thermal *tz = thermal->devdata;
 542         int result;
 543
 544         if (!tz)
 545                 return -EINVAL;
 546
 547         result = acpi_thermal_get_temperature(tz);
 548         if (result)
 549                 return result;
 550
 551         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 552         return 0;
 553 }
 554
 555 static int thermal_get_mode(struct thermal_zone_device *thermal,
 556                                 enum thermal_device_mode *mode)
 557 {
 558         struct acpi_thermal *tz = thermal->devdata;
 559
 560         if (!tz)
 561                 return -EINVAL;
 562
 563         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 564                 THERMAL_DEVICE_DISABLED;
 565
 566         return 0;
 567 }
 568
 569 static int thermal_set_mode(struct thermal_zone_device *thermal,
 570                                 enum thermal_device_mode mode)
 571 {
 572         struct acpi_thermal *tz = thermal->devdata;
 573         int enable;
 574
 575         if (!tz)
 576                 return -EINVAL;
 577
 578         /*
 579          * enable/disable thermal management from ACPI thermal driver
 580          */
 581         if (mode == THERMAL_DEVICE_ENABLED)
 582                 enable = 1;
 583         else if (mode == THERMAL_DEVICE_DISABLED)
 584                 enable = 0;
 585         else
 586                 return -EINVAL;
 587
 588         if (enable != tz->tz_enabled) {
 589                 tz->tz_enabled = enable;
 590                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 591                         "%s kernel ACPI thermal control\n",
 592                         tz->tz_enabled ? "Enable" : "Disable"));
 593                 acpi_thermal_check(tz);
 594         }
 595         return 0;
 596 }
 597
 598 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 599                                  int trip, enum thermal_trip_type *type)
 600 {
 601         struct acpi_thermal *tz = thermal->devdata;
 602         int i;
 603
 604         if (!tz || trip < 0)
 605                 return -EINVAL;
 606
 607         if (tz->trips.critical.flags.valid) {
 608                 if (!trip) {
 609                         *type = THERMAL_TRIP_CRITICAL;
 610                         return 0;
 611                 }
 612                 trip--;
 613         }
 614
 615         if (tz->trips.hot.flags.valid) {
 616                 if (!trip) {
 617                         *type = THERMAL_TRIP_HOT;
 618                         return 0;
 619                 }
 620                 trip--;
 621         }
 622
 623         if (tz->trips.passive.flags.valid) {
 624                 if (!trip) {
 625                         *type = THERMAL_TRIP_PASSIVE;
 626                         return 0;
 627                 }
 628                 trip--;
 629         }
 630
 631         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 632                 tz->trips.active[i].flags.valid; i++) {
 633                 if (!trip) {
 634                         *type = THERMAL_TRIP_ACTIVE;
 635                         return 0;
 636                 }
 637                 trip--;
 638         }
 639
 640         return -EINVAL;
 641 }
 642
 643 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 644                                  int trip, unsigned long *temp)
 645 {
 646         struct acpi_thermal *tz = thermal->devdata;
 647         int i;
 648
 649         if (!tz || trip < 0)
 650                 return -EINVAL;
 651
 652         if (tz->trips.critical.flags.valid) {
 653                 if (!trip) {
 654                         *temp = KELVIN_TO_MILLICELSIUS(
 655                                 tz->trips.critical.temperature,
 656                                 tz->kelvin_offset);
 657                         return 0;
 658                 }
 659                 trip--;
 660         }
 661
 662         if (tz->trips.hot.flags.valid) {
 663                 if (!trip) {
 664                         *temp = KELVIN_TO_MILLICELSIUS(
 665                                 tz->trips.hot.temperature,
 666                                 tz->kelvin_offset);
 667                         return 0;
 668                 }
 669                 trip--;
 670         }
 671
 672         if (tz->trips.passive.flags.valid) {
 673                 if (!trip) {
 674                         *temp = KELVIN_TO_MILLICELSIUS(
 675                                 tz->trips.passive.temperature,
 676                                 tz->kelvin_offset);
 677                         return 0;
 678                 }
 679                 trip--;
 680         }
 681
 682         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 683                 tz->trips.active[i].flags.valid; i++) {
 684                 if (!trip) {
 685                         *temp = KELVIN_TO_MILLICELSIUS(
 686                                 tz->trips.active[i].temperature,
 687                                 tz->kelvin_offset);
 688                         return 0;
 689                 }
 690                 trip--;
 691         }
 692
 693         return -EINVAL;
 694 }
 695
 696 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 697                                 unsigned long *temperature) {
 698         struct acpi_thermal *tz = thermal->devdata;
 699
 700         if (tz->trips.critical.flags.valid) {
 701                 *temperature = KELVIN_TO_MILLICELSIUS(
 702                                 tz->trips.critical.temperature,
 703                                 tz->kelvin_offset);
 704                 return 0;
 705         } else
 706                 return -EINVAL;
 707 }
 708
 709 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 710                            enum thermal_trip_type trip_type)
 711 {
 712         u8 type = 0;
 713         struct acpi_thermal *tz = thermal->devdata;
 714
 715         if (trip_type == THERMAL_TRIP_CRITICAL)
 716                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 717         else if (trip_type == THERMAL_TRIP_HOT)
 718                 type = ACPI_THERMAL_NOTIFY_HOT;
 719         else
 720                 return 0;
 721
 722         acpi_bus_generate_proc_event(tz->device, type, 1);
 723         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 724                                         dev_name(&tz->device->dev), type, 1);
 725
 726         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 727                 return 1;
 728
 729         return 0;
 730 }
 731
 732 typedef int (*cb)(struct thermal_zone_device *, int,
 733                   struct thermal_cooling_device *);
 734 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 735                                         struct thermal_cooling_device *cdev,
 736                                         cb action)
 737 {
 738         struct acpi_device *device = cdev->devdata;
 739         struct acpi_thermal *tz = thermal->devdata;
 740         struct acpi_device *dev;
 741         acpi_status status;
 742         acpi_handle handle;
 743         int i;
 744         int j;
 745         int trip = -1;
 746         int result = 0;
 747
 748         if (tz->trips.critical.flags.valid)
 749                 trip++;
 750
 751         if (tz->trips.hot.flags.valid)
 752                 trip++;
 753
 754         if (tz->trips.passive.flags.valid) {
 755                 trip++;
 756                 for (i = 0; i < tz->trips.passive.devices.count;
 757                     i++) {
 758                         handle = tz->trips.passive.devices.handles[i];
 759                         status = acpi_bus_get_device(handle, &dev);
 760                         if (ACPI_SUCCESS(status) && (dev == device)) {
 761                                 result = action(thermal, trip, cdev);
 762                                 if (result)
 763                                         goto failed;
 764                         }
 765                 }
 766         }
 767
 768         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 769                 if (!tz->trips.active[i].flags.valid)
 770                         break;
 771                 trip++;
 772                 for (j = 0;
 773                     j < tz->trips.active[i].devices.count;
 774                     j++) {
 775                         handle = tz->trips.active[i].devices.handles[j];
 776                         status = acpi_bus_get_device(handle, &dev);
 777                         if (ACPI_SUCCESS(status) && (dev == device)) {
 778                                 result = action(thermal, trip, cdev);
 779                                 if (result)
 780                                         goto failed;
 781                         }
 782                 }
 783         }
 784
 785         for (i = 0; i < tz->devices.count; i++) {
 786                 handle = tz->devices.handles[i];
 787                 status = acpi_bus_get_device(handle, &dev);
 788                 if (ACPI_SUCCESS(status) && (dev == device)) {
 789                         result = action(thermal, -1, cdev);
 790                         if (result)
 791                                 goto failed;
 792                 }
 793         }
 794
 795 failed:
 796         return result;
 797 }
 798
 799 static int
 800 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 801                                         struct thermal_cooling_device *cdev)
 802 {
 803         return acpi_thermal_cooling_device_cb(thermal, cdev,
 804                                 thermal_zone_bind_cooling_device);
 805 }
 806
 807 static int
 808 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 809                                         struct thermal_cooling_device *cdev)
 810 {
 811         return acpi_thermal_cooling_device_cb(thermal, cdev,
 812                                 thermal_zone_unbind_cooling_device);
 813 }
 814
 815 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 816         .bind = acpi_thermal_bind_cooling_device,
 817         .unbind = acpi_thermal_unbind_cooling_device,
 818         .get_temp = thermal_get_temp,
 819         .get_mode = thermal_get_mode,
 820         .set_mode = thermal_set_mode,
 821         .get_trip_type = thermal_get_trip_type,
 822         .get_trip_temp = thermal_get_trip_temp,
 823         .get_crit_temp = thermal_get_crit_temp,
 824         .notify = thermal_notify,
 825 };
 826
 827 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 828 {
 829         int trips = 0;
 830         int result;
 831         acpi_status status;
 832         int i;
 833
 834         if (tz->trips.critical.flags.valid)
 835                 trips++;
 836
 837         if (tz->trips.hot.flags.valid)
 838                 trips++;
 839
 840         if (tz->trips.passive.flags.valid)
 841                 trips++;
 842
 843         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 844                         tz->trips.active[i].flags.valid; i++, trips++);
 845
 846         if (tz->trips.passive.flags.valid)
 847                 tz->thermal_zone =
 848                         thermal_zone_device_register("acpitz", trips, 0, tz,
 849                                                      &acpi_thermal_zone_ops,
 850                                                      tz->trips.passive.tc1,
 851                                                      tz->trips.passive.tc2,
 852                                                      tz->trips.passive.tsp*100,
 853                                                      tz->polling_frequency*100);
 854         else
 855                 tz->thermal_zone =
 856                         thermal_zone_device_register("acpitz", trips, 0, tz,
 857                                                      &acpi_thermal_zone_ops,
 858                                                      0, 0, 0,
 859                                                      tz->polling_frequency*100);
 860         if (IS_ERR(tz->thermal_zone))
 861                 return -ENODEV;
 862
 863         result = sysfs_create_link(&tz->device->dev.kobj,
 864                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 865         if (result)
 866                 return result;
 867
 868         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 869                                    &tz->device->dev.kobj, "device");
 870         if (result)
 871                 return result;
 872
 873         status = acpi_attach_data(tz->device->handle,
 874                                   acpi_bus_private_data_handler,
 875                                   tz->thermal_zone);
 876         if (ACPI_FAILURE(status)) {
 877                 printk(KERN_ERR PREFIX
 878                                 "Error attaching device data\n");
 879                 return -ENODEV;
 880         }
 881
 882         tz->tz_enabled = 1;
 883
 884         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 885                  tz->thermal_zone->id);
 886         return 0;
 887 }
 888
 889 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 890 {
 891         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 892         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 893         thermal_zone_device_unregister(tz->thermal_zone);
 894         tz->thermal_zone = NULL;
 895         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 896 }
 897
 898
 899 /* --------------------------------------------------------------------------
 900                                  Driver Interface
 901    -------------------------------------------------------------------------- */
 902
 903 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 904 {
 905         struct acpi_thermal *tz = acpi_driver_data(device);
 906
 907
 908         if (!tz)
 909                 return;
 910
 911         switch (event) {
 912         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 913                 acpi_thermal_check(tz);
 914                 break;
 915         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 916                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 917                 acpi_thermal_check(tz);
 918                 acpi_bus_generate_proc_event(device, event, 0);
 919                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 920                                                   dev_name(&device->dev), event, 0);
 921                 break;
 922         case ACPI_THERMAL_NOTIFY_DEVICES:
 923                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 924                 acpi_thermal_check(tz);
 925                 acpi_bus_generate_proc_event(device, event, 0);
 926                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 927                                                   dev_name(&device->dev), event, 0);
 928                 break;
 929         default:
 930                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 931                                   "Unsupported event [0x%x]\n", event));
 932                 break;
 933         }
 934 }
 935
 936 static int acpi_thermal_get_info(struct acpi_thermal *tz)
 937 {
 938         int result = 0;
 939
 940
 941         if (!tz)
 942                 return -EINVAL;
 943
 944         /* Get trip points [_CRT, _PSV, etc.] (required) */
 945         result = acpi_thermal_get_trip_points(tz);
 946         if (result)
 947                 return result;
 948
 949         /* Get temperature [_TMP] (required) */
 950         result = acpi_thermal_get_temperature(tz);
 951         if (result)
 952                 return result;
 953
 954         /* Set the cooling mode [_SCP] to active cooling (default) */
 955         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
 956         if (!result)
 957                 tz->flags.cooling_mode = 1;
 958
 959         /* Get default polling frequency [_TZP] (optional) */
 960         if (tzp)
 961                 tz->polling_frequency = tzp;
 962         else
 963                 acpi_thermal_get_polling_frequency(tz);
 964
 965         return 0;
 966 }
 967
 968 /*
 969  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
 970  * handles temperature values with a single decimal place. As a consequence,
 971  * some implementations use an offset of 273.1 and others use an offset of
 972  * 273.2. Try to find out which one is being used, to present the most
 973  * accurate and visually appealing number.
 974  *
 975  * The heuristic below should work for all ACPI thermal zones which have a
 976  * critical trip point with a value being a multiple of 0.5 degree Celsius.
 977  */
 978 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
 979 {
 980         if (tz->trips.critical.flags.valid &&
 981             (tz->trips.critical.temperature % 5) == 1)
 982                 tz->kelvin_offset = 2731;
 983         else
 984                 tz->kelvin_offset = 2732;
 985 }
 986
 987 static int acpi_thermal_add(struct acpi_device *device)
 988 {
 989         int result = 0;
 990         struct acpi_thermal *tz = NULL;
 991
 992
 993         if (!device)
 994                 return -EINVAL;
 995
 996         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
 997         if (!tz)
 998                 return -ENOMEM;
 999
1000         tz->device = device;
1001         strcpy(tz->name, device->pnp.bus_id);
1002         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1003         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1004         device->driver_data = tz;
1005         mutex_init(&tz->lock);
1006
1007
1008         result = acpi_thermal_get_info(tz);
1009         if (result)
1010                 goto free_memory;
1011
1012         acpi_thermal_guess_offset(tz);
1013
1014         result = acpi_thermal_register_thermal_zone(tz);
1015         if (result)
1016                 goto free_memory;
1017
1018         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1019                acpi_device_name(device), acpi_device_bid(device),
1020                KELVIN_TO_CELSIUS(tz->temperature));
1021         goto end;
1022
1023 free_memory:
1024         kfree(tz);
1025 end:
1026         return result;
1027 }
1028
1029 static int acpi_thermal_remove(struct acpi_device *device, int type)
1030 {
1031         struct acpi_thermal *tz = NULL;
1032
1033         if (!device || !acpi_driver_data(device))
1034                 return -EINVAL;
1035
1036         tz = acpi_driver_data(device);
1037
1038         acpi_thermal_unregister_thermal_zone(tz);
1039         mutex_destroy(&tz->lock);
1040         kfree(tz);
1041         return 0;
1042 }
1043
1044 static int acpi_thermal_resume(struct device *dev)
1045 {
1046         struct acpi_thermal *tz;
1047         int i, j, power_state, result;
1048
1049         if (!dev)
1050                 return -EINVAL;
1051
1052         tz = acpi_driver_data(to_acpi_device(dev));
1053         if (!tz)
1054                 return -EINVAL;
1055
1056         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1057                 if (!(&tz->trips.active[i]))
1058                         break;
1059                 if (!tz->trips.active[i].flags.valid)
1060                         break;
1061                 tz->trips.active[i].flags.enabled = 1;
1062                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1063                         result = acpi_bus_update_power(
1064                                         tz->trips.active[i].devices.handles[j],
1065                                         &power_state);
1066                         if (result || (power_state != ACPI_STATE_D0)) {
1067                                 tz->trips.active[i].flags.enabled = 0;
1068                                 break;
1069                         }
1070                 }
1071                 tz->state.active |= tz->trips.active[i].flags.enabled;
1072         }
1073
1074         acpi_thermal_check(tz);
1075
1076         return AE_OK;
1077 }
1078
1079 static int thermal_act(const struct dmi_system_id *d) {
1080
1081         if (act == 0) {
1082                 printk(KERN_NOTICE "ACPI: %s detected: "
1083                         "disabling all active thermal trip points\n", d->ident);
1084                 act = -1;
1085         }
1086         return 0;
1087 }
1088 static int thermal_nocrt(const struct dmi_system_id *d) {
1089
1090         printk(KERN_NOTICE "ACPI: %s detected: "
1091                 "disabling all critical thermal trip point actions.\n", d->ident);
1092         nocrt = 1;
1093         return 0;
1094 }
1095 static int thermal_tzp(const struct dmi_system_id *d) {
1096
1097         if (tzp == 0) {
1098                 printk(KERN_NOTICE "ACPI: %s detected: "
1099                         "enabling thermal zone polling\n", d->ident);
1100                 tzp = 300;      /* 300 dS = 30 Seconds */
1101         }
1102         return 0;
1103 }
1104 static int thermal_psv(const struct dmi_system_id *d) {
1105
1106         if (psv == 0) {
1107                 printk(KERN_NOTICE "ACPI: %s detected: "
1108                         "disabling all passive thermal trip points\n", d->ident);
1109                 psv = -1;
1110         }
1111         return 0;
1112 }
1113
1114 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1115         /*
1116          * Award BIOS on this AOpen makes thermal control almost worthless.
1117          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1118          */
1119         {
1120          .callback = thermal_act,
1121          .ident = "AOpen i915GMm-HFS",
1122          .matches = {
1123                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1124                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1125                 },
1126         },
1127         {
1128          .callback = thermal_psv,
1129          .ident = "AOpen i915GMm-HFS",
1130          .matches = {
1131                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1132                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1133                 },
1134         },
1135         {
1136          .callback = thermal_tzp,
1137          .ident = "AOpen i915GMm-HFS",
1138          .matches = {
1139                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1140                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1141                 },
1142         },
1143         {
1144          .callback = thermal_nocrt,
1145          .ident = "Gigabyte GA-7ZX",
1146          .matches = {
1147                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1148                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1149                 },
1150         },
1151         {}
1152 };
1153
1154 static int __init acpi_thermal_init(void)
1155 {
1156         int result = 0;
1157
1158         dmi_check_system(thermal_dmi_table);
1159
1160         if (off) {
1161                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1162                 return -ENODEV;
1163         }
1164
1165         result = acpi_bus_register_driver(&acpi_thermal_driver);
1166         if (result < 0)
1167                 return -ENODEV;
1168
1169         return 0;
1170 }
1171
1172 static void __exit acpi_thermal_exit(void)
1173 {
1174
1175         acpi_bus_unregister_driver(&acpi_thermal_driver);
1176
1177         return;
1178 }
1179
1180 module_init(acpi_thermal_init);
1181 module_exit(acpi_thermal_exit);