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         if (tz->tz_enabled == THERMAL_DEVICE_DISABLED) {
 226                 tz->polling_frequency = 0;
 227                 return 0;
 228         }
 229
 230         /* Get default polling frequency [_TZP] (optional) */
 231         if (tzp) {
 232                 tz->polling_frequency = tzp;
 233                 return 0;
 234         }
 235
 236         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 237         if (ACPI_FAILURE(status))
 238                 return -ENODEV;
 239
 240         tz->polling_frequency = tmp;
 241         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 242                           tz->polling_frequency));
 243
 244         return 0;
 245 }
 246
 247 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 248 {
 249         acpi_status status = AE_OK;
 250         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 251         struct acpi_object_list arg_list = { 1, &arg0 };
 252         acpi_handle handle = NULL;
 253
 254
 255         if (!tz)
 256                 return -EINVAL;
 257
 258         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 259         if (ACPI_FAILURE(status)) {
 260                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 261                 return -ENODEV;
 262         }
 263
 264         arg0.integer.value = mode;
 265
 266         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 267         if (ACPI_FAILURE(status))
 268                 return -ENODEV;
 269
 270         return 0;
 271 }
 272
 273 #define ACPI_TRIPS_CRITICAL     0x01
 274 #define ACPI_TRIPS_HOT          0x02
 275 #define ACPI_TRIPS_PASSIVE      0x04
 276 #define ACPI_TRIPS_ACTIVE       0x08
 277 #define ACPI_TRIPS_DEVICES      0x10
 278
 279 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 280 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 281
 282 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 283                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 284                               ACPI_TRIPS_DEVICES)
 285
 286 /*
 287  * This exception is thrown out in two cases:
 288  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 289  *   when re-evaluating the AML code.
 290  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 291  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 292  */
 293 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 294 do {    \
 295         if (flags != ACPI_TRIPS_INIT)   \
 296                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 297                 "ACPI thermal trip point %s changed\n"  \
 298                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 299 } while (0)
 300
 301 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 302 {
 303         acpi_status status = AE_OK;
 304         unsigned long long tmp;
 305         struct acpi_handle_list devices;
 306         int valid = 0;
 307         int i;
 308
 309         /* Critical Shutdown */
 310         if (flag & ACPI_TRIPS_CRITICAL) {
 311                 status = acpi_evaluate_integer(tz->device->handle,
 312                                 "_CRT", NULL, &tmp);
 313                 tz->trips.critical.temperature = tmp;
 314                 /*
 315                  * Treat freezing temperatures as invalid as well; some
 316                  * BIOSes return really low values and cause reboots at startup.
 317                  * Below zero (Celsius) values clearly aren't right for sure..
 318                  * ... so lets discard those as invalid.
 319                  */
 320                 if (ACPI_FAILURE(status)) {
 321                         tz->trips.critical.flags.valid = 0;
 322                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 323                                           "No critical threshold\n"));
 324                 } else if (tmp <= 2732) {
 325                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 326                                "(%llu)\n", tmp);
 327                         tz->trips.critical.flags.valid = 0;
 328                 } else {
 329                         tz->trips.critical.flags.valid = 1;
 330                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 331                                           "Found critical threshold [%lu]\n",
 332                                           tz->trips.critical.temperature));
 333                 }
 334                 if (tz->trips.critical.flags.valid == 1) {
 335                         if (crt == -1) {
 336                                 tz->trips.critical.flags.valid = 0;
 337                         } else if (crt > 0) {
 338                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 339                                 /*
 340                                  * Allow override critical threshold
 341                                  */
 342                                 if (crt_k > tz->trips.critical.temperature)
 343                                         printk(KERN_WARNING PREFIX
 344                                                 "Critical threshold %d C\n", crt);
 345                                 tz->trips.critical.temperature = crt_k;
 346                         }
 347                 }
 348         }
 349
 350         /* Critical Sleep (optional) */
 351         if (flag & ACPI_TRIPS_HOT) {
 352                 status = acpi_evaluate_integer(tz->device->handle,
 353                                 "_HOT", NULL, &tmp);
 354                 if (ACPI_FAILURE(status)) {
 355                         tz->trips.hot.flags.valid = 0;
 356                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 357                                         "No hot threshold\n"));
 358                 } else {
 359                         tz->trips.hot.temperature = tmp;
 360                         tz->trips.hot.flags.valid = 1;
 361                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 362                                         "Found hot threshold [%lu]\n",
 363                                         tz->trips.critical.temperature));
 364                 }
 365         }
 366
 367         /* Passive (optional) */
 368         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 369                 (flag == ACPI_TRIPS_INIT)) {
 370                 valid = tz->trips.passive.flags.valid;
 371                 if (psv == -1) {
 372                         status = AE_SUPPORT;
 373                 } else if (psv > 0) {
 374                         tmp = CELSIUS_TO_KELVIN(psv);
 375                         status = AE_OK;
 376                 } else {
 377                         status = acpi_evaluate_integer(tz->device->handle,
 378                                 "_PSV", NULL, &tmp);
 379                 }
 380
 381                 if (ACPI_FAILURE(status))
 382                         tz->trips.passive.flags.valid = 0;
 383                 else {
 384                         tz->trips.passive.temperature = tmp;
 385                         tz->trips.passive.flags.valid = 1;
 386                         if (flag == ACPI_TRIPS_INIT) {
 387                                 status = acpi_evaluate_integer(
 388                                                 tz->device->handle, "_TC1",
 389                                                 NULL, &tmp);
 390                                 if (ACPI_FAILURE(status))
 391                                         tz->trips.passive.flags.valid = 0;
 392                                 else
 393                                         tz->trips.passive.tc1 = tmp;
 394                                 status = acpi_evaluate_integer(
 395                                                 tz->device->handle, "_TC2",
 396                                                 NULL, &tmp);
 397                                 if (ACPI_FAILURE(status))
 398                                         tz->trips.passive.flags.valid = 0;
 399                                 else
 400                                         tz->trips.passive.tc2 = tmp;
 401                                 status = acpi_evaluate_integer(
 402                                                 tz->device->handle, "_TSP",
 403                                                 NULL, &tmp);
 404                                 if (ACPI_FAILURE(status))
 405                                         tz->trips.passive.flags.valid = 0;
 406                                 else
 407                                         tz->trips.passive.tsp = tmp;
 408                         }
 409                 }
 410         }
 411         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 412                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 413                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 414                                                         NULL, &devices);
 415                 if (ACPI_FAILURE(status)) {
 416                         printk(KERN_WARNING PREFIX
 417                                 "Invalid passive threshold\n");
 418                         tz->trips.passive.flags.valid = 0;
 419                 }
 420                 else
 421                         tz->trips.passive.flags.valid = 1;
 422
 423                 if (memcmp(&tz->trips.passive.devices, &devices,
 424                                 sizeof(struct acpi_handle_list))) {
 425                         memcpy(&tz->trips.passive.devices, &devices,
 426                                 sizeof(struct acpi_handle_list));
 427                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 428                 }
 429         }
 430         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 431                 if (valid != tz->trips.passive.flags.valid)
 432                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 433         }
 434
 435         /* Active (optional) */
 436         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 437                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 438                 valid = tz->trips.active[i].flags.valid;
 439
 440                 if (act == -1)
 441                         break; /* disable all active trip points */
 442
 443                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 444                         tz->trips.active[i].flags.valid)) {
 445                         status = acpi_evaluate_integer(tz->device->handle,
 446                                                         name, NULL, &tmp);
 447                         if (ACPI_FAILURE(status)) {
 448                                 tz->trips.active[i].flags.valid = 0;
 449                                 if (i == 0)
 450                                         break;
 451                                 if (act <= 0)
 452                                         break;
 453                                 if (i == 1)
 454                                         tz->trips.active[0].temperature =
 455                                                 CELSIUS_TO_KELVIN(act);
 456                                 else
 457                                         /*
 458                                          * Don't allow override higher than
 459                                          * the next higher trip point
 460                                          */
 461                                         tz->trips.active[i - 1].temperature =
 462                                                 (tz->trips.active[i - 2].temperature <
 463                                                 CELSIUS_TO_KELVIN(act) ?
 464                                                 tz->trips.active[i - 2].temperature :
 465                                                 CELSIUS_TO_KELVIN(act));
 466                                 break;
 467                         } else {
 468                                 tz->trips.active[i].temperature = tmp;
 469                                 tz->trips.active[i].flags.valid = 1;
 470                         }
 471                 }
 472
 473                 name[2] = 'L';
 474                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 475                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 476                         status = acpi_evaluate_reference(tz->device->handle,
 477                                                 name, NULL, &devices);
 478                         if (ACPI_FAILURE(status)) {
 479                                 printk(KERN_WARNING PREFIX
 480                                         "Invalid active%d threshold\n", i);
 481                                 tz->trips.active[i].flags.valid = 0;
 482                         }
 483                         else
 484                                 tz->trips.active[i].flags.valid = 1;
 485
 486                         if (memcmp(&tz->trips.active[i].devices, &devices,
 487                                         sizeof(struct acpi_handle_list))) {
 488                                 memcpy(&tz->trips.active[i].devices, &devices,
 489                                         sizeof(struct acpi_handle_list));
 490                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 491                         }
 492                 }
 493                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 494                         if (valid != tz->trips.active[i].flags.valid)
 495                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 496
 497                 if (!tz->trips.active[i].flags.valid)
 498                         break;
 499         }
 500
 501         if (flag & ACPI_TRIPS_DEVICES) {
 502                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 503                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 504                                                 NULL, &devices);
 505                 if (memcmp(&tz->devices, &devices,
 506                                 sizeof(struct acpi_handle_list))) {
 507                         memcpy(&tz->devices, &devices,
 508                                 sizeof(struct acpi_handle_list));
 509                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 510                 }
 511         }
 512
 513         return 0;
 514 }
 515
 516 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 517 {
 518         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 519
 520         if (ret)
 521                 return ret;
 522
 523         valid = tz->trips.critical.flags.valid |
 524                 tz->trips.hot.flags.valid |
 525                 tz->trips.passive.flags.valid;
 526
 527         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 528                 valid |= tz->trips.active[i].flags.valid;
 529
 530         if (!valid) {
 531                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 532                 return -ENODEV;
 533         }
 534         return 0;
 535 }
 536
 537 static void acpi_thermal_check(void *data)
 538 {
 539         struct acpi_thermal *tz = data;
 540
 541         thermal_zone_device_update(tz->thermal_zone);
 542 }
 543
 544 /* sys I/F for generic thermal sysfs support */
 545 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 546
 547 static int thermal_get_temp(struct thermal_zone_device *thermal,
 548                             unsigned long *temp)
 549 {
 550         struct acpi_thermal *tz = thermal->devdata;
 551         int result;
 552
 553         if (!tz)
 554                 return -EINVAL;
 555
 556         result = acpi_thermal_get_temperature(tz);
 557         if (result)
 558                 return result;
 559
 560         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 561         return 0;
 562 }
 563
 564 static const char enabled[] = "kernel";
 565 static const char disabled[] = "user";
 566 static int thermal_get_mode(struct thermal_zone_device *thermal,
 567                                 enum thermal_device_mode *mode)
 568 {
 569         struct acpi_thermal *tz = thermal->devdata;
 570
 571         if (!tz)
 572                 return -EINVAL;
 573
 574         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 575                 THERMAL_DEVICE_DISABLED;
 576
 577         return 0;
 578 }
 579
 580 static int thermal_set_mode(struct thermal_zone_device *thermal,
 581                                 enum thermal_device_mode mode)
 582 {
 583         struct acpi_thermal *tz = thermal->devdata;
 584         int enable;
 585
 586         if (!tz)
 587                 return -EINVAL;
 588
 589         /*
 590          * enable/disable thermal management from ACPI thermal driver
 591          */
 592         if (mode == THERMAL_DEVICE_ENABLED)
 593                 enable = 1;
 594         else if (mode == THERMAL_DEVICE_DISABLED)
 595                 enable = 0;
 596         else
 597                 return -EINVAL;
 598
 599         if (enable != tz->tz_enabled) {
 600                 tz->tz_enabled = enable;
 601                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 602                         "%s ACPI thermal control\n",
 603                         tz->tz_enabled ? enabled : disabled));
 604
 605                 acpi_thermal_get_polling_frequency(tz);
 606
 607                 mutex_lock(&tz->thermal_zone->lock);
 608                 tz->thermal_zone->polling_delay = tz->polling_frequency*100;
 609                 tz->thermal_zone->passive_delay = tz->polling_frequency*100;
 610                 mutex_unlock(&tz->thermal_zone->lock);
 611
 612                 acpi_thermal_check(tz);
 613         }
 614         return 0;
 615 }
 616
 617 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 618                                  int trip, enum thermal_trip_type *type)
 619 {
 620         struct acpi_thermal *tz = thermal->devdata;
 621         int i;
 622
 623         if (!tz || trip < 0)
 624                 return -EINVAL;
 625
 626         if (tz->trips.critical.flags.valid) {
 627                 if (!trip) {
 628                         *type = THERMAL_TRIP_CRITICAL;
 629                         return 0;
 630                 }
 631                 trip--;
 632         }
 633
 634         if (tz->trips.hot.flags.valid) {
 635                 if (!trip) {
 636                         *type = THERMAL_TRIP_HOT;
 637                         return 0;
 638                 }
 639                 trip--;
 640         }
 641
 642         if (tz->trips.passive.flags.valid) {
 643                 if (!trip) {
 644                         *type = THERMAL_TRIP_PASSIVE;
 645                         return 0;
 646                 }
 647                 trip--;
 648         }
 649
 650         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 651                 tz->trips.active[i].flags.valid; i++) {
 652                 if (!trip) {
 653                         *type = THERMAL_TRIP_ACTIVE;
 654                         return 0;
 655                 }
 656                 trip--;
 657         }
 658
 659         return -EINVAL;
 660 }
 661
 662 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 663                                  int trip, unsigned long *temp)
 664 {
 665         struct acpi_thermal *tz = thermal->devdata;
 666         int i;
 667
 668         if (!tz || trip < 0)
 669                 return -EINVAL;
 670
 671         if (tz->trips.critical.flags.valid) {
 672                 if (!trip) {
 673                         *temp = KELVIN_TO_MILLICELSIUS(
 674                                 tz->trips.critical.temperature,
 675                                 tz->kelvin_offset);
 676                         return 0;
 677                 }
 678                 trip--;
 679         }
 680
 681         if (tz->trips.hot.flags.valid) {
 682                 if (!trip) {
 683                         *temp = KELVIN_TO_MILLICELSIUS(
 684                                 tz->trips.hot.temperature,
 685                                 tz->kelvin_offset);
 686                         return 0;
 687                 }
 688                 trip--;
 689         }
 690
 691         if (tz->trips.passive.flags.valid) {
 692                 if (!trip) {
 693                         *temp = KELVIN_TO_MILLICELSIUS(
 694                                 tz->trips.passive.temperature,
 695                                 tz->kelvin_offset);
 696                         return 0;
 697                 }
 698                 trip--;
 699         }
 700
 701         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 702                 tz->trips.active[i].flags.valid; i++) {
 703                 if (!trip) {
 704                         *temp = KELVIN_TO_MILLICELSIUS(
 705                                 tz->trips.active[i].temperature,
 706                                 tz->kelvin_offset);
 707                         return 0;
 708                 }
 709                 trip--;
 710         }
 711
 712         return -EINVAL;
 713 }
 714
 715 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 716                                 unsigned long *temperature) {
 717         struct acpi_thermal *tz = thermal->devdata;
 718
 719         if (tz->trips.critical.flags.valid) {
 720                 *temperature = KELVIN_TO_MILLICELSIUS(
 721                                 tz->trips.critical.temperature,
 722                                 tz->kelvin_offset);
 723                 return 0;
 724         } else
 725                 return -EINVAL;
 726 }
 727
 728 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 729                            enum thermal_trip_type trip_type)
 730 {
 731         u8 type = 0;
 732         struct acpi_thermal *tz = thermal->devdata;
 733
 734         if (trip_type == THERMAL_TRIP_CRITICAL)
 735                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 736         else if (trip_type == THERMAL_TRIP_HOT)
 737                 type = ACPI_THERMAL_NOTIFY_HOT;
 738         else
 739                 return 0;
 740
 741         acpi_bus_generate_proc_event(tz->device, type, 1);
 742         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 743                                         dev_name(&tz->device->dev), type, 1);
 744
 745         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 746                 return 1;
 747
 748         return 0;
 749 }
 750
 751 typedef int (*cb)(struct thermal_zone_device *, int,
 752                   struct thermal_cooling_device *);
 753 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 754                                         struct thermal_cooling_device *cdev,
 755                                         cb action)
 756 {
 757         struct acpi_device *device = cdev->devdata;
 758         struct acpi_thermal *tz = thermal->devdata;
 759         struct acpi_device *dev;
 760         acpi_status status;
 761         acpi_handle handle;
 762         int i;
 763         int j;
 764         int trip = -1;
 765         int result = 0;
 766
 767         if (tz->trips.critical.flags.valid)
 768                 trip++;
 769
 770         if (tz->trips.hot.flags.valid)
 771                 trip++;
 772
 773         if (tz->trips.passive.flags.valid) {
 774                 trip++;
 775                 for (i = 0; i < tz->trips.passive.devices.count;
 776                     i++) {
 777                         handle = tz->trips.passive.devices.handles[i];
 778                         status = acpi_bus_get_device(handle, &dev);
 779                         if (ACPI_SUCCESS(status) && (dev == device)) {
 780                                 result = action(thermal, trip, cdev);
 781                                 if (result)
 782                                         goto failed;
 783                         }
 784                 }
 785         }
 786
 787         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 788                 if (!tz->trips.active[i].flags.valid)
 789                         break;
 790                 trip++;
 791                 for (j = 0;
 792                     j < tz->trips.active[i].devices.count;
 793                     j++) {
 794                         handle = tz->trips.active[i].devices.handles[j];
 795                         status = acpi_bus_get_device(handle, &dev);
 796                         if (ACPI_SUCCESS(status) && (dev == device)) {
 797                                 result = action(thermal, trip, cdev);
 798                                 if (result)
 799                                         goto failed;
 800                         }
 801                 }
 802         }
 803
 804         for (i = 0; i < tz->devices.count; i++) {
 805                 handle = tz->devices.handles[i];
 806                 status = acpi_bus_get_device(handle, &dev);
 807                 if (ACPI_SUCCESS(status) && (dev == device)) {
 808                         result = action(thermal, -1, cdev);
 809                         if (result)
 810                                 goto failed;
 811                 }
 812         }
 813
 814 failed:
 815         return result;
 816 }
 817
 818 static int
 819 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 820                                         struct thermal_cooling_device *cdev)
 821 {
 822         return acpi_thermal_cooling_device_cb(thermal, cdev,
 823                                 thermal_zone_bind_cooling_device);
 824 }
 825
 826 static int
 827 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 828                                         struct thermal_cooling_device *cdev)
 829 {
 830         return acpi_thermal_cooling_device_cb(thermal, cdev,
 831                                 thermal_zone_unbind_cooling_device);
 832 }
 833
 834 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 835         .bind = acpi_thermal_bind_cooling_device,
 836         .unbind = acpi_thermal_unbind_cooling_device,
 837         .get_temp = thermal_get_temp,
 838         .get_mode = thermal_get_mode,
 839         .set_mode = thermal_set_mode,
 840         .get_trip_type = thermal_get_trip_type,
 841         .get_trip_temp = thermal_get_trip_temp,
 842         .get_crit_temp = thermal_get_crit_temp,
 843         .notify = thermal_notify,
 844 };
 845
 846 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 847 {
 848         int trips = 0;
 849         int result;
 850         acpi_status status;
 851         int i;
 852
 853         if (tz->trips.critical.flags.valid)
 854                 trips++;
 855
 856         if (tz->trips.hot.flags.valid)
 857                 trips++;
 858
 859         if (tz->trips.passive.flags.valid)
 860                 trips++;
 861
 862         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 863                         tz->trips.active[i].flags.valid; i++, trips++);
 864
 865         if (tz->trips.passive.flags.valid)
 866                 tz->thermal_zone =
 867                         thermal_zone_device_register("acpitz", trips, tz,
 868                                                      &acpi_thermal_zone_ops,
 869                                                      tz->trips.passive.tc1,
 870                                                      tz->trips.passive.tc2,
 871                                                      tz->trips.passive.tsp*100,
 872                                                      tz->polling_frequency*100);
 873         else
 874                 tz->thermal_zone =
 875                         thermal_zone_device_register("acpitz", trips, tz,
 876                                                      &acpi_thermal_zone_ops,
 877                                                      0, 0, 0,
 878                                                      tz->polling_frequency*100);
 879         if (IS_ERR(tz->thermal_zone))
 880                 return -ENODEV;
 881
 882         result = sysfs_create_link(&tz->device->dev.kobj,
 883                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 884         if (result)
 885                 return result;
 886
 887         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 888                                    &tz->device->dev.kobj, "device");
 889         if (result)
 890                 return result;
 891
 892         status = acpi_attach_data(tz->device->handle,
 893                                   acpi_bus_private_data_handler,
 894                                   tz->thermal_zone);
 895         if (ACPI_FAILURE(status)) {
 896                 printk(KERN_ERR PREFIX
 897                                 "Error attaching device data\n");
 898                 return -ENODEV;
 899         }
 900
 901         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 902                  tz->thermal_zone->id);
 903         return 0;
 904 }
 905
 906 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 907 {
 908         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 909         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 910         thermal_zone_device_unregister(tz->thermal_zone);
 911         tz->thermal_zone = NULL;
 912         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 913 }
 914
 915
 916 /* --------------------------------------------------------------------------
 917                                  Driver Interface
 918    -------------------------------------------------------------------------- */
 919
 920 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 921 {
 922         struct acpi_thermal *tz = acpi_driver_data(device);
 923
 924
 925         if (!tz)
 926                 return;
 927
 928         switch (event) {
 929         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 930                 acpi_thermal_check(tz);
 931                 break;
 932         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 933                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 934                 acpi_thermal_check(tz);
 935                 acpi_bus_generate_proc_event(device, event, 0);
 936                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 937                                                   dev_name(&device->dev), event, 0);
 938                 break;
 939         case ACPI_THERMAL_NOTIFY_DEVICES:
 940                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 941                 acpi_thermal_check(tz);
 942                 acpi_bus_generate_proc_event(device, event, 0);
 943                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 944                                                   dev_name(&device->dev), event, 0);
 945                 break;
 946         default:
 947                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 948                                   "Unsupported event [0x%x]\n", event));
 949                 break;
 950         }
 951 }
 952
 953 static int acpi_thermal_get_info(struct acpi_thermal *tz)
 954 {
 955         int result = 0;
 956
 957
 958         if (!tz)
 959                 return -EINVAL;
 960
 961         /* Get trip points [_CRT, _PSV, etc.] (required) */
 962         result = acpi_thermal_get_trip_points(tz);
 963         if (result)
 964                 return result;
 965
 966         /* Get temperature [_TMP] (required) */
 967         result = acpi_thermal_get_temperature(tz);
 968         if (result)
 969                 return result;
 970
 971         /* Set the cooling mode [_SCP] to active cooling (default) */
 972         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
 973         if (!result)
 974                 tz->flags.cooling_mode = 1;
 975
 976         acpi_thermal_get_polling_frequency(tz);
 977
 978         return 0;
 979 }
 980
 981 /*
 982  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
 983  * handles temperature values with a single decimal place. As a consequence,
 984  * some implementations use an offset of 273.1 and others use an offset of
 985  * 273.2. Try to find out which one is being used, to present the most
 986  * accurate and visually appealing number.
 987  *
 988  * The heuristic below should work for all ACPI thermal zones which have a
 989  * critical trip point with a value being a multiple of 0.5 degree Celsius.
 990  */
 991 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
 992 {
 993         if (tz->trips.critical.flags.valid &&
 994             (tz->trips.critical.temperature % 5) == 1)
 995                 tz->kelvin_offset = 2731;
 996         else
 997                 tz->kelvin_offset = 2732;
 998 }
 999
1000 static int acpi_thermal_add(struct acpi_device *device)
1001 {
1002         int result = 0;
1003         struct acpi_thermal *tz = NULL;
1004
1005
1006         if (!device)
1007                 return -EINVAL;
1008
1009         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1010         if (!tz)
1011                 return -ENOMEM;
1012
1013         tz->device = device;
1014         tz->tz_enabled = 1;
1015         strcpy(tz->name, device->pnp.bus_id);
1016         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1017         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1018         device->driver_data = tz;
1019         mutex_init(&tz->lock);
1020
1021
1022         result = acpi_thermal_get_info(tz);
1023         if (result)
1024                 goto free_memory;
1025
1026         acpi_thermal_guess_offset(tz);
1027
1028         result = acpi_thermal_register_thermal_zone(tz);
1029         if (result)
1030                 goto free_memory;
1031
1032         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1033                acpi_device_name(device), acpi_device_bid(device),
1034                KELVIN_TO_CELSIUS(tz->temperature));
1035         goto end;
1036
1037 free_memory:
1038         kfree(tz);
1039 end:
1040         return result;
1041 }
1042
1043 static int acpi_thermal_remove(struct acpi_device *device, int type)
1044 {
1045         struct acpi_thermal *tz = NULL;
1046
1047         if (!device || !acpi_driver_data(device))
1048                 return -EINVAL;
1049
1050         tz = acpi_driver_data(device);
1051
1052         acpi_thermal_unregister_thermal_zone(tz);
1053         mutex_destroy(&tz->lock);
1054         kfree(tz);
1055         return 0;
1056 }
1057
1058 static int acpi_thermal_resume(struct acpi_device *device)
1059 {
1060         struct acpi_thermal *tz = NULL;
1061         int i, j, power_state, result;
1062
1063
1064         if (!device || !acpi_driver_data(device))
1065                 return -EINVAL;
1066
1067         tz = acpi_driver_data(device);
1068
1069         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1070                 if (!(&tz->trips.active[i]))
1071                         break;
1072                 if (!tz->trips.active[i].flags.valid)
1073                         break;
1074                 tz->trips.active[i].flags.enabled = 1;
1075                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1076                         result = acpi_bus_update_power(
1077                                         tz->trips.active[i].devices.handles[j],
1078                                         &power_state);
1079                         if (result || (power_state != ACPI_STATE_D0)) {
1080                                 tz->trips.active[i].flags.enabled = 0;
1081                                 break;
1082                         }
1083                 }
1084                 tz->state.active |= tz->trips.active[i].flags.enabled;
1085         }
1086
1087         acpi_thermal_check(tz);
1088
1089         return AE_OK;
1090 }
1091
1092 static int thermal_act(const struct dmi_system_id *d) {
1093
1094         if (act == 0) {
1095                 printk(KERN_NOTICE "ACPI: %s detected: "
1096                         "disabling all active thermal trip points\n", d->ident);
1097                 act = -1;
1098         }
1099         return 0;
1100 }
1101 static int thermal_nocrt(const struct dmi_system_id *d) {
1102
1103         printk(KERN_NOTICE "ACPI: %s detected: "
1104                 "disabling all critical thermal trip point actions.\n", d->ident);
1105         nocrt = 1;
1106         return 0;
1107 }
1108 static int thermal_tzp(const struct dmi_system_id *d) {
1109
1110         if (tzp == 0) {
1111                 printk(KERN_NOTICE "ACPI: %s detected: "
1112                         "enabling thermal zone polling\n", d->ident);
1113                 tzp = 300;      /* 300 dS = 30 Seconds */
1114         }
1115         return 0;
1116 }
1117 static int thermal_psv(const struct dmi_system_id *d) {
1118
1119         if (psv == 0) {
1120                 printk(KERN_NOTICE "ACPI: %s detected: "
1121                         "disabling all passive thermal trip points\n", d->ident);
1122                 psv = -1;
1123         }
1124         return 0;
1125 }
1126
1127 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1128         /*
1129          * Award BIOS on this AOpen makes thermal control almost worthless.
1130          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1131          */
1132         {
1133          .callback = thermal_act,
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_psv,
1142          .ident = "AOpen i915GMm-HFS",
1143          .matches = {
1144                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1145                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1146                 },
1147         },
1148         {
1149          .callback = thermal_tzp,
1150          .ident = "AOpen i915GMm-HFS",
1151          .matches = {
1152                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1153                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1154                 },
1155         },
1156         {
1157          .callback = thermal_nocrt,
1158          .ident = "Gigabyte GA-7ZX",
1159          .matches = {
1160                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1161                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1162                 },
1163         },
1164         {}
1165 };
1166
1167 static int __init acpi_thermal_init(void)
1168 {
1169         int result = 0;
1170
1171         dmi_check_system(thermal_dmi_table);
1172
1173         if (off) {
1174                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1175                 return -ENODEV;
1176         }
1177
1178         result = acpi_bus_register_driver(&acpi_thermal_driver);
1179         if (result < 0)
1180                 return -ENODEV;
1181
1182         return 0;
1183 }
1184
1185 static void __exit acpi_thermal_exit(void)
1186 {
1187
1188         acpi_bus_unregister_driver(&acpi_thermal_driver);
1189
1190         return;
1191 }
1192
1193 module_init(acpi_thermal_init);
1194 module_exit(acpi_thermal_exit);