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