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