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