drivers/acpi/thermal.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *
   8  *  This driver fully implements the ACPI thermal policy as described in the
   9  *  ACPI 2.0 Specification.
  10  *
  11  *  TBD: 1. Implement passive cooling hysteresis.
  12  *       2. Enhance passive cooling (CPU) states/limit interface to support
  13  *          concepts of 'multiple limiters', upper/lower limits, etc.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/dmi.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/types.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/kmod.h>
  24 #include <linux/reboot.h>
  25 #include <linux/device.h>
  26 #include <linux/thermal.h>
  27 #include <linux/acpi.h>
  28 #include <linux/workqueue.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/units.h>
  31
  32 #define PREFIX "ACPI: "
  33
  34 #define ACPI_THERMAL_CLASS              "thermal_zone"
  35 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  36 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  37 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  38 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  39 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  40 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  41 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  42
  43 #define ACPI_THERMAL_MAX_ACTIVE 10
  44 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  45
  46 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  47 ACPI_MODULE_NAME("thermal");
  48
  49 MODULE_AUTHOR("Paul Diefenbaugh");
  50 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  51 MODULE_LICENSE("GPL");
  52
  53 static int act;
  54 module_param(act, int, 0644);
  55 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  56
  57 static int crt;
  58 module_param(crt, int, 0644);
  59 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  60
  61 static int tzp;
  62 module_param(tzp, int, 0444);
  63 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  64
  65 static int nocrt;
  66 module_param(nocrt, int, 0);
  67 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  68
  69 static int off;
  70 module_param(off, int, 0);
  71 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  72
  73 static int psv;
  74 module_param(psv, int, 0644);
  75 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  76
  77 static struct workqueue_struct *acpi_thermal_pm_queue;
  78
  79 static int acpi_thermal_add(struct acpi_device *device);
  80 static int acpi_thermal_remove(struct acpi_device *device);
  81 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
  82
  83 static const struct acpi_device_id  thermal_device_ids[] = {
  84         {ACPI_THERMAL_HID, 0},
  85         {"", 0},
  86 };
  87 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
  88
  89 #ifdef CONFIG_PM_SLEEP
  90 static int acpi_thermal_suspend(struct device *dev);
  91 static int acpi_thermal_resume(struct device *dev);
  92 #else
  93 #define acpi_thermal_suspend NULL
  94 #define acpi_thermal_resume NULL
  95 #endif
  96 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
  97
  98 static struct acpi_driver acpi_thermal_driver = {
  99         .name = "thermal",
 100         .class = ACPI_THERMAL_CLASS,
 101         .ids = thermal_device_ids,
 102         .ops = {
 103                 .add = acpi_thermal_add,
 104                 .remove = acpi_thermal_remove,
 105                 .notify = acpi_thermal_notify,
 106                 },
 107         .drv.pm = &acpi_thermal_pm,
 108 };
 109
 110 struct acpi_thermal_state {
 111         u8 critical:1;
 112         u8 hot:1;
 113         u8 passive:1;
 114         u8 active:1;
 115         u8 reserved:4;
 116         int active_index;
 117 };
 118
 119 struct acpi_thermal_state_flags {
 120         u8 valid:1;
 121         u8 enabled:1;
 122         u8 reserved:6;
 123 };
 124
 125 struct acpi_thermal_critical {
 126         struct acpi_thermal_state_flags flags;
 127         unsigned long temperature;
 128 };
 129
 130 struct acpi_thermal_hot {
 131         struct acpi_thermal_state_flags flags;
 132         unsigned long temperature;
 133 };
 134
 135 struct acpi_thermal_passive {
 136         struct acpi_thermal_state_flags flags;
 137         unsigned long temperature;
 138         unsigned long tc1;
 139         unsigned long tc2;
 140         unsigned long tsp;
 141         struct acpi_handle_list devices;
 142 };
 143
 144 struct acpi_thermal_active {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147         struct acpi_handle_list devices;
 148 };
 149
 150 struct acpi_thermal_trips {
 151         struct acpi_thermal_critical critical;
 152         struct acpi_thermal_hot hot;
 153         struct acpi_thermal_passive passive;
 154         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 155 };
 156
 157 struct acpi_thermal_flags {
 158         u8 cooling_mode:1;      /* _SCP */
 159         u8 devices:1;           /* _TZD */
 160         u8 reserved:6;
 161 };
 162
 163 struct acpi_thermal {
 164         struct acpi_device * device;
 165         acpi_bus_id name;
 166         unsigned long temperature;
 167         unsigned long last_temperature;
 168         unsigned long polling_frequency;
 169         volatile u8 zombie;
 170         struct acpi_thermal_flags flags;
 171         struct acpi_thermal_state state;
 172         struct acpi_thermal_trips trips;
 173         struct acpi_handle_list devices;
 174         struct thermal_zone_device *thermal_zone;
 175         int kelvin_offset;      /* in millidegrees */
 176         struct work_struct thermal_check_work;
 177 };
 178
 179 /* --------------------------------------------------------------------------
 180                              Thermal Zone Management
 181    -------------------------------------------------------------------------- */
 182
 183 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 184 {
 185         acpi_status status = AE_OK;
 186         unsigned long long tmp;
 187
 188         if (!tz)
 189                 return -EINVAL;
 190
 191         tz->last_temperature = tz->temperature;
 192
 193         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 194         if (ACPI_FAILURE(status))
 195                 return -ENODEV;
 196
 197         tz->temperature = tmp;
 198         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 199                           tz->temperature));
 200
 201         return 0;
 202 }
 203
 204 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 205 {
 206         acpi_status status = AE_OK;
 207         unsigned long long tmp;
 208
 209         if (!tz)
 210                 return -EINVAL;
 211
 212         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 213         if (ACPI_FAILURE(status))
 214                 return -ENODEV;
 215
 216         tz->polling_frequency = tmp;
 217         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 218                           tz->polling_frequency));
 219
 220         return 0;
 221 }
 222
 223 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 224 {
 225         if (!tz)
 226                 return -EINVAL;
 227
 228         if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
 229                                                     "_SCP", mode)))
 230                 return -ENODEV;
 231
 232         return 0;
 233 }
 234
 235 #define ACPI_TRIPS_CRITICAL     0x01
 236 #define ACPI_TRIPS_HOT          0x02
 237 #define ACPI_TRIPS_PASSIVE      0x04
 238 #define ACPI_TRIPS_ACTIVE       0x08
 239 #define ACPI_TRIPS_DEVICES      0x10
 240
 241 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 242 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 243
 244 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 245                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 246                               ACPI_TRIPS_DEVICES)
 247
 248 /*
 249  * This exception is thrown out in two cases:
 250  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 251  *   when re-evaluating the AML code.
 252  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 253  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 254  */
 255 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 256 do {    \
 257         if (flags != ACPI_TRIPS_INIT)   \
 258                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 259                 "ACPI thermal trip point %s changed\n"  \
 260                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 261 } while (0)
 262
 263 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 264 {
 265         acpi_status status = AE_OK;
 266         unsigned long long tmp;
 267         struct acpi_handle_list devices;
 268         int valid = 0;
 269         int i;
 270
 271         /* Critical Shutdown */
 272         if (flag & ACPI_TRIPS_CRITICAL) {
 273                 status = acpi_evaluate_integer(tz->device->handle,
 274                                 "_CRT", NULL, &tmp);
 275                 tz->trips.critical.temperature = tmp;
 276                 /*
 277                  * Treat freezing temperatures as invalid as well; some
 278                  * BIOSes return really low values and cause reboots at startup.
 279                  * Below zero (Celsius) values clearly aren't right for sure..
 280                  * ... so lets discard those as invalid.
 281                  */
 282                 if (ACPI_FAILURE(status)) {
 283                         tz->trips.critical.flags.valid = 0;
 284                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 285                                           "No critical threshold\n"));
 286                 } else if (tmp <= 2732) {
 287                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
 288                                 tmp);
 289                         tz->trips.critical.flags.valid = 0;
 290                 } else {
 291                         tz->trips.critical.flags.valid = 1;
 292                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 293                                           "Found critical threshold [%lu]\n",
 294                                           tz->trips.critical.temperature));
 295                 }
 296                 if (tz->trips.critical.flags.valid == 1) {
 297                         if (crt == -1) {
 298                                 tz->trips.critical.flags.valid = 0;
 299                         } else if (crt > 0) {
 300                                 unsigned long crt_k = celsius_to_deci_kelvin(crt);
 301
 302                                 /*
 303                                  * Allow override critical threshold
 304                                  */
 305                                 if (crt_k > tz->trips.critical.temperature)
 306                                         pr_warn(PREFIX "Critical threshold %d C\n",
 307                                                 crt);
 308                                 tz->trips.critical.temperature = crt_k;
 309                         }
 310                 }
 311         }
 312
 313         /* Critical Sleep (optional) */
 314         if (flag & ACPI_TRIPS_HOT) {
 315                 status = acpi_evaluate_integer(tz->device->handle,
 316                                 "_HOT", NULL, &tmp);
 317                 if (ACPI_FAILURE(status)) {
 318                         tz->trips.hot.flags.valid = 0;
 319                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 320                                         "No hot threshold\n"));
 321                 } else {
 322                         tz->trips.hot.temperature = tmp;
 323                         tz->trips.hot.flags.valid = 1;
 324                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 325                                         "Found hot threshold [%lu]\n",
 326                                         tz->trips.hot.temperature));
 327                 }
 328         }
 329
 330         /* Passive (optional) */
 331         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 332                 (flag == ACPI_TRIPS_INIT)) {
 333                 valid = tz->trips.passive.flags.valid;
 334                 if (psv == -1) {
 335                         status = AE_SUPPORT;
 336                 } else if (psv > 0) {
 337                         tmp = celsius_to_deci_kelvin(psv);
 338                         status = AE_OK;
 339                 } else {
 340                         status = acpi_evaluate_integer(tz->device->handle,
 341                                 "_PSV", NULL, &tmp);
 342                 }
 343
 344                 if (ACPI_FAILURE(status))
 345                         tz->trips.passive.flags.valid = 0;
 346                 else {
 347                         tz->trips.passive.temperature = tmp;
 348                         tz->trips.passive.flags.valid = 1;
 349                         if (flag == ACPI_TRIPS_INIT) {
 350                                 status = acpi_evaluate_integer(
 351                                                 tz->device->handle, "_TC1",
 352                                                 NULL, &tmp);
 353                                 if (ACPI_FAILURE(status))
 354                                         tz->trips.passive.flags.valid = 0;
 355                                 else
 356                                         tz->trips.passive.tc1 = tmp;
 357                                 status = acpi_evaluate_integer(
 358                                                 tz->device->handle, "_TC2",
 359                                                 NULL, &tmp);
 360                                 if (ACPI_FAILURE(status))
 361                                         tz->trips.passive.flags.valid = 0;
 362                                 else
 363                                         tz->trips.passive.tc2 = tmp;
 364                                 status = acpi_evaluate_integer(
 365                                                 tz->device->handle, "_TSP",
 366                                                 NULL, &tmp);
 367                                 if (ACPI_FAILURE(status))
 368                                         tz->trips.passive.flags.valid = 0;
 369                                 else
 370                                         tz->trips.passive.tsp = tmp;
 371                         }
 372                 }
 373         }
 374         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 375                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 376                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 377                                                         NULL, &devices);
 378                 if (ACPI_FAILURE(status)) {
 379                         pr_warn(PREFIX "Invalid passive threshold\n");
 380                         tz->trips.passive.flags.valid = 0;
 381                 }
 382                 else
 383                         tz->trips.passive.flags.valid = 1;
 384
 385                 if (memcmp(&tz->trips.passive.devices, &devices,
 386                                 sizeof(struct acpi_handle_list))) {
 387                         memcpy(&tz->trips.passive.devices, &devices,
 388                                 sizeof(struct acpi_handle_list));
 389                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 390                 }
 391         }
 392         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 393                 if (valid != tz->trips.passive.flags.valid)
 394                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 395         }
 396
 397         /* Active (optional) */
 398         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 399                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 400                 valid = tz->trips.active[i].flags.valid;
 401
 402                 if (act == -1)
 403                         break; /* disable all active trip points */
 404
 405                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 406                         tz->trips.active[i].flags.valid)) {
 407                         status = acpi_evaluate_integer(tz->device->handle,
 408                                                         name, NULL, &tmp);
 409                         if (ACPI_FAILURE(status)) {
 410                                 tz->trips.active[i].flags.valid = 0;
 411                                 if (i == 0)
 412                                         break;
 413                                 if (act <= 0)
 414                                         break;
 415                                 if (i == 1)
 416                                         tz->trips.active[0].temperature =
 417                                                 celsius_to_deci_kelvin(act);
 418                                 else
 419                                         /*
 420                                          * Don't allow override higher than
 421                                          * the next higher trip point
 422                                          */
 423                                         tz->trips.active[i - 1].temperature =
 424                                                 (tz->trips.active[i - 2].temperature <
 425                                                 celsius_to_deci_kelvin(act) ?
 426                                                 tz->trips.active[i - 2].temperature :
 427                                                 celsius_to_deci_kelvin(act));
 428                                 break;
 429                         } else {
 430                                 tz->trips.active[i].temperature = tmp;
 431                                 tz->trips.active[i].flags.valid = 1;
 432                         }
 433                 }
 434
 435                 name[2] = 'L';
 436                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 437                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 438                         status = acpi_evaluate_reference(tz->device->handle,
 439                                                 name, NULL, &devices);
 440                         if (ACPI_FAILURE(status)) {
 441                                 pr_warn(PREFIX "Invalid active%d threshold\n",
 442                                         i);
 443                                 tz->trips.active[i].flags.valid = 0;
 444                         }
 445                         else
 446                                 tz->trips.active[i].flags.valid = 1;
 447
 448                         if (memcmp(&tz->trips.active[i].devices, &devices,
 449                                         sizeof(struct acpi_handle_list))) {
 450                                 memcpy(&tz->trips.active[i].devices, &devices,
 451                                         sizeof(struct acpi_handle_list));
 452                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 453                         }
 454                 }
 455                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 456                         if (valid != tz->trips.active[i].flags.valid)
 457                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 458
 459                 if (!tz->trips.active[i].flags.valid)
 460                         break;
 461         }
 462
 463         if (flag & ACPI_TRIPS_DEVICES) {
 464                 memset(&devices, 0, sizeof(devices));
 465                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 466                                                 NULL, &devices);
 467                 if (ACPI_SUCCESS(status)
 468                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
 469                         tz->devices = devices;
 470                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 471                 }
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 478 {
 479         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 480
 481         if (ret)
 482                 return ret;
 483
 484         valid = tz->trips.critical.flags.valid |
 485                 tz->trips.hot.flags.valid |
 486                 tz->trips.passive.flags.valid;
 487
 488         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 489                 valid |= tz->trips.active[i].flags.valid;
 490
 491         if (!valid) {
 492                 pr_warn(FW_BUG "No valid trip found\n");
 493                 return -ENODEV;
 494         }
 495         return 0;
 496 }
 497
 498 static void acpi_thermal_check(void *data)
 499 {
 500         struct acpi_thermal *tz = data;
 501
 502         thermal_zone_device_update(tz->thermal_zone,
 503                                    THERMAL_EVENT_UNSPECIFIED);
 504 }
 505
 506 /* sys I/F for generic thermal sysfs support */
 507
 508 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
 509 {
 510         struct acpi_thermal *tz = thermal->devdata;
 511         int result;
 512
 513         if (!tz)
 514                 return -EINVAL;
 515
 516         result = acpi_thermal_get_temperature(tz);
 517         if (result)
 518                 return result;
 519
 520         *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
 521                                                         tz->kelvin_offset);
 522         return 0;
 523 }
 524
 525 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 526                                  int trip, enum thermal_trip_type *type)
 527 {
 528         struct acpi_thermal *tz = thermal->devdata;
 529         int i;
 530
 531         if (!tz || trip < 0)
 532                 return -EINVAL;
 533
 534         if (tz->trips.critical.flags.valid) {
 535                 if (!trip) {
 536                         *type = THERMAL_TRIP_CRITICAL;
 537                         return 0;
 538                 }
 539                 trip--;
 540         }
 541
 542         if (tz->trips.hot.flags.valid) {
 543                 if (!trip) {
 544                         *type = THERMAL_TRIP_HOT;
 545                         return 0;
 546                 }
 547                 trip--;
 548         }
 549
 550         if (tz->trips.passive.flags.valid) {
 551                 if (!trip) {
 552                         *type = THERMAL_TRIP_PASSIVE;
 553                         return 0;
 554                 }
 555                 trip--;
 556         }
 557
 558         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 559                 tz->trips.active[i].flags.valid; i++) {
 560                 if (!trip) {
 561                         *type = THERMAL_TRIP_ACTIVE;
 562                         return 0;
 563                 }
 564                 trip--;
 565         }
 566
 567         return -EINVAL;
 568 }
 569
 570 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 571                                  int trip, int *temp)
 572 {
 573         struct acpi_thermal *tz = thermal->devdata;
 574         int i;
 575
 576         if (!tz || trip < 0)
 577                 return -EINVAL;
 578
 579         if (tz->trips.critical.flags.valid) {
 580                 if (!trip) {
 581                         *temp = deci_kelvin_to_millicelsius_with_offset(
 582                                 tz->trips.critical.temperature,
 583                                 tz->kelvin_offset);
 584                         return 0;
 585                 }
 586                 trip--;
 587         }
 588
 589         if (tz->trips.hot.flags.valid) {
 590                 if (!trip) {
 591                         *temp = deci_kelvin_to_millicelsius_with_offset(
 592                                 tz->trips.hot.temperature,
 593                                 tz->kelvin_offset);
 594                         return 0;
 595                 }
 596                 trip--;
 597         }
 598
 599         if (tz->trips.passive.flags.valid) {
 600                 if (!trip) {
 601                         *temp = deci_kelvin_to_millicelsius_with_offset(
 602                                 tz->trips.passive.temperature,
 603                                 tz->kelvin_offset);
 604                         return 0;
 605                 }
 606                 trip--;
 607         }
 608
 609         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 610                 tz->trips.active[i].flags.valid; i++) {
 611                 if (!trip) {
 612                         *temp = deci_kelvin_to_millicelsius_with_offset(
 613                                 tz->trips.active[i].temperature,
 614                                 tz->kelvin_offset);
 615                         return 0;
 616                 }
 617                 trip--;
 618         }
 619
 620         return -EINVAL;
 621 }
 622
 623 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 624                                 int *temperature)
 625 {
 626         struct acpi_thermal *tz = thermal->devdata;
 627
 628         if (tz->trips.critical.flags.valid) {
 629                 *temperature = deci_kelvin_to_millicelsius_with_offset(
 630                                 tz->trips.critical.temperature,
 631                                 tz->kelvin_offset);
 632                 return 0;
 633         } else
 634                 return -EINVAL;
 635 }
 636
 637 static int thermal_get_trend(struct thermal_zone_device *thermal,
 638                                 int trip, enum thermal_trend *trend)
 639 {
 640         struct acpi_thermal *tz = thermal->devdata;
 641         enum thermal_trip_type type;
 642         int i;
 643
 644         if (thermal_get_trip_type(thermal, trip, &type))
 645                 return -EINVAL;
 646
 647         if (type == THERMAL_TRIP_ACTIVE) {
 648                 int trip_temp;
 649                 int temp = deci_kelvin_to_millicelsius_with_offset(
 650                                         tz->temperature, tz->kelvin_offset);
 651                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 652                         return -EINVAL;
 653
 654                 if (temp > trip_temp) {
 655                         *trend = THERMAL_TREND_RAISING;
 656                         return 0;
 657                 } else {
 658                         /* Fall back on default trend */
 659                         return -EINVAL;
 660                 }
 661         }
 662
 663         /*
 664          * tz->temperature has already been updated by generic thermal layer,
 665          * before this callback being invoked
 666          */
 667         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 668                 + (tz->trips.passive.tc2
 669                 * (tz->temperature - tz->trips.passive.temperature));
 670
 671         if (i > 0)
 672                 *trend = THERMAL_TREND_RAISING;
 673         else if (i < 0)
 674                 *trend = THERMAL_TREND_DROPPING;
 675         else
 676                 *trend = THERMAL_TREND_STABLE;
 677         return 0;
 678 }
 679
 680
 681 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 682                            enum thermal_trip_type trip_type)
 683 {
 684         u8 type = 0;
 685         struct acpi_thermal *tz = thermal->devdata;
 686
 687         if (trip_type == THERMAL_TRIP_CRITICAL)
 688                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 689         else if (trip_type == THERMAL_TRIP_HOT)
 690                 type = ACPI_THERMAL_NOTIFY_HOT;
 691         else
 692                 return 0;
 693
 694         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 695                                         dev_name(&tz->device->dev), type, 1);
 696
 697         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 698                 return 1;
 699
 700         return 0;
 701 }
 702
 703 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 704                                         struct thermal_cooling_device *cdev,
 705                                         bool bind)
 706 {
 707         struct acpi_device *device = cdev->devdata;
 708         struct acpi_thermal *tz = thermal->devdata;
 709         struct acpi_device *dev;
 710         acpi_status status;
 711         acpi_handle handle;
 712         int i;
 713         int j;
 714         int trip = -1;
 715         int result = 0;
 716
 717         if (tz->trips.critical.flags.valid)
 718                 trip++;
 719
 720         if (tz->trips.hot.flags.valid)
 721                 trip++;
 722
 723         if (tz->trips.passive.flags.valid) {
 724                 trip++;
 725                 for (i = 0; i < tz->trips.passive.devices.count;
 726                     i++) {
 727                         handle = tz->trips.passive.devices.handles[i];
 728                         status = acpi_bus_get_device(handle, &dev);
 729                         if (ACPI_FAILURE(status) || dev != device)
 730                                 continue;
 731                         if (bind)
 732                                 result =
 733                                         thermal_zone_bind_cooling_device
 734                                         (thermal, trip, cdev,
 735                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 736                                          THERMAL_WEIGHT_DEFAULT);
 737                         else
 738                                 result =
 739                                         thermal_zone_unbind_cooling_device
 740                                         (thermal, trip, cdev);
 741                         if (result)
 742                                 goto failed;
 743                 }
 744         }
 745
 746         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 747                 if (!tz->trips.active[i].flags.valid)
 748                         break;
 749                 trip++;
 750                 for (j = 0;
 751                     j < tz->trips.active[i].devices.count;
 752                     j++) {
 753                         handle = tz->trips.active[i].devices.handles[j];
 754                         status = acpi_bus_get_device(handle, &dev);
 755                         if (ACPI_FAILURE(status) || dev != device)
 756                                 continue;
 757                         if (bind)
 758                                 result = thermal_zone_bind_cooling_device
 759                                         (thermal, trip, cdev,
 760                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 761                                          THERMAL_WEIGHT_DEFAULT);
 762                         else
 763                                 result = thermal_zone_unbind_cooling_device
 764                                         (thermal, trip, cdev);
 765                         if (result)
 766                                 goto failed;
 767                 }
 768         }
 769
 770         for (i = 0; i < tz->devices.count; i++) {
 771                 handle = tz->devices.handles[i];
 772                 status = acpi_bus_get_device(handle, &dev);
 773                 if (ACPI_SUCCESS(status) && (dev == device)) {
 774                         if (bind)
 775                                 result = thermal_zone_bind_cooling_device
 776                                                 (thermal, THERMAL_TRIPS_NONE,
 777                                                  cdev, THERMAL_NO_LIMIT,
 778                                                  THERMAL_NO_LIMIT,
 779                                                  THERMAL_WEIGHT_DEFAULT);
 780                         else
 781                                 result = thermal_zone_unbind_cooling_device
 782                                                 (thermal, THERMAL_TRIPS_NONE,
 783                                                  cdev);
 784                         if (result)
 785                                 goto failed;
 786                 }
 787         }
 788
 789 failed:
 790         return result;
 791 }
 792
 793 static int
 794 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 795                                         struct thermal_cooling_device *cdev)
 796 {
 797         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 798 }
 799
 800 static int
 801 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 802                                         struct thermal_cooling_device *cdev)
 803 {
 804         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 805 }
 806
 807 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 808         .bind = acpi_thermal_bind_cooling_device,
 809         .unbind = acpi_thermal_unbind_cooling_device,
 810         .get_temp = thermal_get_temp,
 811         .get_trip_type = thermal_get_trip_type,
 812         .get_trip_temp = thermal_get_trip_temp,
 813         .get_crit_temp = thermal_get_crit_temp,
 814         .get_trend = thermal_get_trend,
 815         .notify = thermal_notify,
 816 };
 817
 818 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 819 {
 820         int trips = 0;
 821         int result;
 822         acpi_status status;
 823         int i;
 824
 825         if (tz->trips.critical.flags.valid)
 826                 trips++;
 827
 828         if (tz->trips.hot.flags.valid)
 829                 trips++;
 830
 831         if (tz->trips.passive.flags.valid)
 832                 trips++;
 833
 834         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 835                         tz->trips.active[i].flags.valid; i++, trips++);
 836
 837         if (tz->trips.passive.flags.valid)
 838                 tz->thermal_zone =
 839                         thermal_zone_device_register("acpitz", trips, 0, tz,
 840                                                 &acpi_thermal_zone_ops, NULL,
 841                                                      tz->trips.passive.tsp*100,
 842                                                      tz->polling_frequency*100);
 843         else
 844                 tz->thermal_zone =
 845                         thermal_zone_device_register("acpitz", trips, 0, tz,
 846                                                 &acpi_thermal_zone_ops, NULL,
 847                                                 0, tz->polling_frequency*100);
 848         if (IS_ERR(tz->thermal_zone))
 849                 return -ENODEV;
 850
 851         result = sysfs_create_link(&tz->device->dev.kobj,
 852                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 853         if (result)
 854                 goto unregister_tzd;
 855
 856         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 857                                    &tz->device->dev.kobj, "device");
 858         if (result)
 859                 goto remove_tz_link;
 860
 861         status =  acpi_bus_attach_private_data(tz->device->handle,
 862                                                tz->thermal_zone);
 863         if (ACPI_FAILURE(status)) {
 864                 result = -ENODEV;
 865                 goto remove_dev_link;
 866         }
 867
 868         result = thermal_zone_device_enable(tz->thermal_zone);
 869         if (result)
 870                 goto acpi_bus_detach;
 871
 872         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 873                  tz->thermal_zone->id);
 874
 875         return 0;
 876
 877 acpi_bus_detach:
 878         acpi_bus_detach_private_data(tz->device->handle);
 879 remove_dev_link:
 880         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 881 remove_tz_link:
 882         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 883 unregister_tzd:
 884         thermal_zone_device_unregister(tz->thermal_zone);
 885
 886         return result;
 887 }
 888
 889 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 890 {
 891         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 892         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 893         thermal_zone_device_unregister(tz->thermal_zone);
 894         tz->thermal_zone = NULL;
 895         acpi_bus_detach_private_data(tz->device->handle);
 896 }
 897
 898
 899 /* --------------------------------------------------------------------------
 900                                  Driver Interface
 901    -------------------------------------------------------------------------- */
 902
 903 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 904 {
 905         struct acpi_thermal *tz = acpi_driver_data(device);
 906
 907
 908         if (!tz)
 909                 return;
 910
 911         switch (event) {
 912         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 913                 acpi_thermal_check(tz);
 914                 break;
 915         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 916                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 917                 acpi_thermal_check(tz);
 918                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 919                                                   dev_name(&device->dev), event, 0);
 920                 break;
 921         case ACPI_THERMAL_NOTIFY_DEVICES:
 922                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 923                 acpi_thermal_check(tz);
 924                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 925                                                   dev_name(&device->dev), event, 0);
 926                 break;
 927         default:
 928                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 929                                   "Unsupported event [0x%x]\n", event));
 930                 break;
 931         }
 932 }
 933
 934 /*
 935  * On some platforms, the AML code has dependency about
 936  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 937  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 938  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 939  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 940  *    if _TMP has never been evaluated.
 941  *
 942  * As this dependency is totally transparent to OS, evaluate
 943  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
 944  * _TMP, before they are actually used.
 945  */
 946 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 947 {
 948         acpi_handle handle = tz->device->handle;
 949         unsigned long long value;
 950         int i;
 951
 952         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
 953         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
 954         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
 955         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 956                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 957                 acpi_status status;
 958
 959                 status = acpi_evaluate_integer(handle, name, NULL, &value);
 960                 if (status == AE_NOT_FOUND)
 961                         break;
 962         }
 963         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
 964 }
 965
 966 static int acpi_thermal_get_info(struct acpi_thermal *tz)
 967 {
 968         int result = 0;
 969
 970
 971         if (!tz)
 972                 return -EINVAL;
 973
 974         acpi_thermal_aml_dependency_fix(tz);
 975
 976         /* Get trip points [_CRT, _PSV, etc.] (required) */
 977         result = acpi_thermal_get_trip_points(tz);
 978         if (result)
 979                 return result;
 980
 981         /* Get temperature [_TMP] (required) */
 982         result = acpi_thermal_get_temperature(tz);
 983         if (result)
 984                 return result;
 985
 986         /* Set the cooling mode [_SCP] to active cooling (default) */
 987         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
 988         if (!result)
 989                 tz->flags.cooling_mode = 1;
 990
 991         /* Get default polling frequency [_TZP] (optional) */
 992         if (tzp)
 993                 tz->polling_frequency = tzp;
 994         else
 995                 acpi_thermal_get_polling_frequency(tz);
 996
 997         return 0;
 998 }
 999
1000 /*
1001  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1002  * handles temperature values with a single decimal place. As a consequence,
1003  * some implementations use an offset of 273.1 and others use an offset of
1004  * 273.2. Try to find out which one is being used, to present the most
1005  * accurate and visually appealing number.
1006  *
1007  * The heuristic below should work for all ACPI thermal zones which have a
1008  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1009  */
1010 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1011 {
1012         if (tz->trips.critical.flags.valid &&
1013             (tz->trips.critical.temperature % 5) == 1)
1014                 tz->kelvin_offset = 273100;
1015         else
1016                 tz->kelvin_offset = 273200;
1017 }
1018
1019 static void acpi_thermal_check_fn(struct work_struct *work)
1020 {
1021         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1022                                                thermal_check_work);
1023         acpi_thermal_check(tz);
1024 }
1025
1026 static int acpi_thermal_add(struct acpi_device *device)
1027 {
1028         int result = 0;
1029         struct acpi_thermal *tz = NULL;
1030
1031
1032         if (!device)
1033                 return -EINVAL;
1034
1035         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1036         if (!tz)
1037                 return -ENOMEM;
1038
1039         tz->device = device;
1040         strcpy(tz->name, device->pnp.bus_id);
1041         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1042         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1043         device->driver_data = tz;
1044
1045         result = acpi_thermal_get_info(tz);
1046         if (result)
1047                 goto free_memory;
1048
1049         acpi_thermal_guess_offset(tz);
1050
1051         result = acpi_thermal_register_thermal_zone(tz);
1052         if (result)
1053                 goto free_memory;
1054
1055         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1056
1057         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1058                 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1059         goto end;
1060
1061 free_memory:
1062         kfree(tz);
1063 end:
1064         return result;
1065 }
1066
1067 static int acpi_thermal_remove(struct acpi_device *device)
1068 {
1069         struct acpi_thermal *tz = NULL;
1070
1071         if (!device || !acpi_driver_data(device))
1072                 return -EINVAL;
1073
1074         flush_workqueue(acpi_thermal_pm_queue);
1075         tz = acpi_driver_data(device);
1076
1077         acpi_thermal_unregister_thermal_zone(tz);
1078         kfree(tz);
1079         return 0;
1080 }
1081
1082 #ifdef CONFIG_PM_SLEEP
1083 static int acpi_thermal_suspend(struct device *dev)
1084 {
1085         /* Make sure the previously queued thermal check work has been done */
1086         flush_workqueue(acpi_thermal_pm_queue);
1087         return 0;
1088 }
1089
1090 static int acpi_thermal_resume(struct device *dev)
1091 {
1092         struct acpi_thermal *tz;
1093         int i, j, power_state, result;
1094
1095         if (!dev)
1096                 return -EINVAL;
1097
1098         tz = acpi_driver_data(to_acpi_device(dev));
1099         if (!tz)
1100                 return -EINVAL;
1101
1102         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1103                 if (!(&tz->trips.active[i]))
1104                         break;
1105                 if (!tz->trips.active[i].flags.valid)
1106                         break;
1107                 tz->trips.active[i].flags.enabled = 1;
1108                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1109                         result = acpi_bus_update_power(
1110                                         tz->trips.active[i].devices.handles[j],
1111                                         &power_state);
1112                         if (result || (power_state != ACPI_STATE_D0)) {
1113                                 tz->trips.active[i].flags.enabled = 0;
1114                                 break;
1115                         }
1116                 }
1117                 tz->state.active |= tz->trips.active[i].flags.enabled;
1118         }
1119
1120         queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1121
1122         return AE_OK;
1123 }
1124 #endif
1125
1126 static int thermal_act(const struct dmi_system_id *d) {
1127
1128         if (act == 0) {
1129                 pr_notice(PREFIX "%s detected: "
1130                           "disabling all active thermal trip points\n", d->ident);
1131                 act = -1;
1132         }
1133         return 0;
1134 }
1135 static int thermal_nocrt(const struct dmi_system_id *d) {
1136
1137         pr_notice(PREFIX "%s detected: "
1138                   "disabling all critical thermal trip point actions.\n", d->ident);
1139         nocrt = 1;
1140         return 0;
1141 }
1142 static int thermal_tzp(const struct dmi_system_id *d) {
1143
1144         if (tzp == 0) {
1145                 pr_notice(PREFIX "%s detected: "
1146                           "enabling thermal zone polling\n", d->ident);
1147                 tzp = 300;      /* 300 dS = 30 Seconds */
1148         }
1149         return 0;
1150 }
1151 static int thermal_psv(const struct dmi_system_id *d) {
1152
1153         if (psv == 0) {
1154                 pr_notice(PREFIX "%s detected: "
1155                           "disabling all passive thermal trip points\n", d->ident);
1156                 psv = -1;
1157         }
1158         return 0;
1159 }
1160
1161 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1162         /*
1163          * Award BIOS on this AOpen makes thermal control almost worthless.
1164          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1165          */
1166         {
1167          .callback = thermal_act,
1168          .ident = "AOpen i915GMm-HFS",
1169          .matches = {
1170                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1171                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1172                 },
1173         },
1174         {
1175          .callback = thermal_psv,
1176          .ident = "AOpen i915GMm-HFS",
1177          .matches = {
1178                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1179                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1180                 },
1181         },
1182         {
1183          .callback = thermal_tzp,
1184          .ident = "AOpen i915GMm-HFS",
1185          .matches = {
1186                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1187                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1188                 },
1189         },
1190         {
1191          .callback = thermal_nocrt,
1192          .ident = "Gigabyte GA-7ZX",
1193          .matches = {
1194                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1195                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1196                 },
1197         },
1198         {}
1199 };
1200
1201 static int __init acpi_thermal_init(void)
1202 {
1203         int result = 0;
1204
1205         dmi_check_system(thermal_dmi_table);
1206
1207         if (off) {
1208                 pr_notice(PREFIX "thermal control disabled\n");
1209                 return -ENODEV;
1210         }
1211
1212         acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1213                                                 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1214         if (!acpi_thermal_pm_queue)
1215                 return -ENODEV;
1216
1217         result = acpi_bus_register_driver(&acpi_thermal_driver);
1218         if (result < 0) {
1219                 destroy_workqueue(acpi_thermal_pm_queue);
1220                 return -ENODEV;
1221         }
1222
1223         return 0;
1224 }
1225
1226 static void __exit acpi_thermal_exit(void)
1227 {
1228         acpi_bus_unregister_driver(&acpi_thermal_driver);
1229         destroy_workqueue(acpi_thermal_pm_queue);
1230
1231         return;
1232 }
1233
1234 module_init(acpi_thermal_init);
1235 module_exit(acpi_thermal_exit);