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 tz_enabled;
 176         int kelvin_offset;      /* in millidegrees */
 177         struct work_struct thermal_check_work;
 178 };
 179
 180 /* --------------------------------------------------------------------------
 181                              Thermal Zone Management
 182    -------------------------------------------------------------------------- */
 183
 184 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 185 {
 186         acpi_status status = AE_OK;
 187         unsigned long long tmp;
 188
 189         if (!tz)
 190                 return -EINVAL;
 191
 192         tz->last_temperature = tz->temperature;
 193
 194         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 195         if (ACPI_FAILURE(status))
 196                 return -ENODEV;
 197
 198         tz->temperature = tmp;
 199         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 200                           tz->temperature));
 201
 202         return 0;
 203 }
 204
 205 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 206 {
 207         acpi_status status = AE_OK;
 208         unsigned long long tmp;
 209
 210         if (!tz)
 211                 return -EINVAL;
 212
 213         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 214         if (ACPI_FAILURE(status))
 215                 return -ENODEV;
 216
 217         tz->polling_frequency = tmp;
 218         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 219                           tz->polling_frequency));
 220
 221         return 0;
 222 }
 223
 224 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 225 {
 226         if (!tz)
 227                 return -EINVAL;
 228
 229         if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
 230                                                     "_SCP", mode)))
 231                 return -ENODEV;
 232
 233         return 0;
 234 }
 235
 236 #define ACPI_TRIPS_CRITICAL     0x01
 237 #define ACPI_TRIPS_HOT          0x02
 238 #define ACPI_TRIPS_PASSIVE      0x04
 239 #define ACPI_TRIPS_ACTIVE       0x08
 240 #define ACPI_TRIPS_DEVICES      0x10
 241
 242 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 243 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 244
 245 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 246                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 247                               ACPI_TRIPS_DEVICES)
 248
 249 /*
 250  * This exception is thrown out in two cases:
 251  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 252  *   when re-evaluating the AML code.
 253  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 254  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 255  */
 256 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 257 do {    \
 258         if (flags != ACPI_TRIPS_INIT)   \
 259                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 260                 "ACPI thermal trip point %s changed\n"  \
 261                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 262 } while (0)
 263
 264 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 265 {
 266         acpi_status status = AE_OK;
 267         unsigned long long tmp;
 268         struct acpi_handle_list devices;
 269         int valid = 0;
 270         int i;
 271
 272         /* Critical Shutdown */
 273         if (flag & ACPI_TRIPS_CRITICAL) {
 274                 status = acpi_evaluate_integer(tz->device->handle,
 275                                 "_CRT", NULL, &tmp);
 276                 tz->trips.critical.temperature = tmp;
 277                 /*
 278                  * Treat freezing temperatures as invalid as well; some
 279                  * BIOSes return really low values and cause reboots at startup.
 280                  * Below zero (Celsius) values clearly aren't right for sure..
 281                  * ... so lets discard those as invalid.
 282                  */
 283                 if (ACPI_FAILURE(status)) {
 284                         tz->trips.critical.flags.valid = 0;
 285                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 286                                           "No critical threshold\n"));
 287                 } else if (tmp <= 2732) {
 288                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
 289                                 tmp);
 290                         tz->trips.critical.flags.valid = 0;
 291                 } else {
 292                         tz->trips.critical.flags.valid = 1;
 293                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 294                                           "Found critical threshold [%lu]\n",
 295                                           tz->trips.critical.temperature));
 296                 }
 297                 if (tz->trips.critical.flags.valid == 1) {
 298                         if (crt == -1) {
 299                                 tz->trips.critical.flags.valid = 0;
 300                         } else if (crt > 0) {
 301                                 unsigned long crt_k = celsius_to_deci_kelvin(crt);
 302
 303                                 /*
 304                                  * Allow override critical threshold
 305                                  */
 306                                 if (crt_k > tz->trips.critical.temperature)
 307                                         pr_warn(PREFIX "Critical threshold %d C\n",
 308                                                 crt);
 309                                 tz->trips.critical.temperature = crt_k;
 310                         }
 311                 }
 312         }
 313
 314         /* Critical Sleep (optional) */
 315         if (flag & ACPI_TRIPS_HOT) {
 316                 status = acpi_evaluate_integer(tz->device->handle,
 317                                 "_HOT", NULL, &tmp);
 318                 if (ACPI_FAILURE(status)) {
 319                         tz->trips.hot.flags.valid = 0;
 320                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 321                                         "No hot threshold\n"));
 322                 } else {
 323                         tz->trips.hot.temperature = tmp;
 324                         tz->trips.hot.flags.valid = 1;
 325                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 326                                         "Found hot threshold [%lu]\n",
 327                                         tz->trips.hot.temperature));
 328                 }
 329         }
 330
 331         /* Passive (optional) */
 332         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 333                 (flag == ACPI_TRIPS_INIT)) {
 334                 valid = tz->trips.passive.flags.valid;
 335                 if (psv == -1) {
 336                         status = AE_SUPPORT;
 337                 } else if (psv > 0) {
 338                         tmp = celsius_to_deci_kelvin(psv);
 339                         status = AE_OK;
 340                 } else {
 341                         status = acpi_evaluate_integer(tz->device->handle,
 342                                 "_PSV", NULL, &tmp);
 343                 }
 344
 345                 if (ACPI_FAILURE(status))
 346                         tz->trips.passive.flags.valid = 0;
 347                 else {
 348                         tz->trips.passive.temperature = tmp;
 349                         tz->trips.passive.flags.valid = 1;
 350                         if (flag == ACPI_TRIPS_INIT) {
 351                                 status = acpi_evaluate_integer(
 352                                                 tz->device->handle, "_TC1",
 353                                                 NULL, &tmp);
 354                                 if (ACPI_FAILURE(status))
 355                                         tz->trips.passive.flags.valid = 0;
 356                                 else
 357                                         tz->trips.passive.tc1 = tmp;
 358                                 status = acpi_evaluate_integer(
 359                                                 tz->device->handle, "_TC2",
 360                                                 NULL, &tmp);
 361                                 if (ACPI_FAILURE(status))
 362                                         tz->trips.passive.flags.valid = 0;
 363                                 else
 364                                         tz->trips.passive.tc2 = tmp;
 365                                 status = acpi_evaluate_integer(
 366                                                 tz->device->handle, "_TSP",
 367                                                 NULL, &tmp);
 368                                 if (ACPI_FAILURE(status))
 369                                         tz->trips.passive.flags.valid = 0;
 370                                 else
 371                                         tz->trips.passive.tsp = tmp;
 372                         }
 373                 }
 374         }
 375         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 376                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 377                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 378                                                         NULL, &devices);
 379                 if (ACPI_FAILURE(status)) {
 380                         pr_warn(PREFIX "Invalid passive threshold\n");
 381                         tz->trips.passive.flags.valid = 0;
 382                 }
 383                 else
 384                         tz->trips.passive.flags.valid = 1;
 385
 386                 if (memcmp(&tz->trips.passive.devices, &devices,
 387                                 sizeof(struct acpi_handle_list))) {
 388                         memcpy(&tz->trips.passive.devices, &devices,
 389                                 sizeof(struct acpi_handle_list));
 390                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 391                 }
 392         }
 393         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 394                 if (valid != tz->trips.passive.flags.valid)
 395                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 396         }
 397
 398         /* Active (optional) */
 399         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 400                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 401                 valid = tz->trips.active[i].flags.valid;
 402
 403                 if (act == -1)
 404                         break; /* disable all active trip points */
 405
 406                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 407                         tz->trips.active[i].flags.valid)) {
 408                         status = acpi_evaluate_integer(tz->device->handle,
 409                                                         name, NULL, &tmp);
 410                         if (ACPI_FAILURE(status)) {
 411                                 tz->trips.active[i].flags.valid = 0;
 412                                 if (i == 0)
 413                                         break;
 414                                 if (act <= 0)
 415                                         break;
 416                                 if (i == 1)
 417                                         tz->trips.active[0].temperature =
 418                                                 celsius_to_deci_kelvin(act);
 419                                 else
 420                                         /*
 421                                          * Don't allow override higher than
 422                                          * the next higher trip point
 423                                          */
 424                                         tz->trips.active[i - 1].temperature =
 425                                                 (tz->trips.active[i - 2].temperature <
 426                                                 celsius_to_deci_kelvin(act) ?
 427                                                 tz->trips.active[i - 2].temperature :
 428                                                 celsius_to_deci_kelvin(act));
 429                                 break;
 430                         } else {
 431                                 tz->trips.active[i].temperature = tmp;
 432                                 tz->trips.active[i].flags.valid = 1;
 433                         }
 434                 }
 435
 436                 name[2] = 'L';
 437                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 438                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 439                         status = acpi_evaluate_reference(tz->device->handle,
 440                                                 name, NULL, &devices);
 441                         if (ACPI_FAILURE(status)) {
 442                                 pr_warn(PREFIX "Invalid active%d threshold\n",
 443                                         i);
 444                                 tz->trips.active[i].flags.valid = 0;
 445                         }
 446                         else
 447                                 tz->trips.active[i].flags.valid = 1;
 448
 449                         if (memcmp(&tz->trips.active[i].devices, &devices,
 450                                         sizeof(struct acpi_handle_list))) {
 451                                 memcpy(&tz->trips.active[i].devices, &devices,
 452                                         sizeof(struct acpi_handle_list));
 453                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 454                         }
 455                 }
 456                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 457                         if (valid != tz->trips.active[i].flags.valid)
 458                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 459
 460                 if (!tz->trips.active[i].flags.valid)
 461                         break;
 462         }
 463
 464         if (flag & ACPI_TRIPS_DEVICES) {
 465                 memset(&devices, 0, sizeof(devices));
 466                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 467                                                 NULL, &devices);
 468                 if (ACPI_SUCCESS(status)
 469                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
 470                         tz->devices = devices;
 471                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 472                 }
 473         }
 474
 475         return 0;
 476 }
 477
 478 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 479 {
 480         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 481
 482         if (ret)
 483                 return ret;
 484
 485         valid = tz->trips.critical.flags.valid |
 486                 tz->trips.hot.flags.valid |
 487                 tz->trips.passive.flags.valid;
 488
 489         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 490                 valid |= tz->trips.active[i].flags.valid;
 491
 492         if (!valid) {
 493                 pr_warn(FW_BUG "No valid trip found\n");
 494                 return -ENODEV;
 495         }
 496         return 0;
 497 }
 498
 499 static void acpi_thermal_check(void *data)
 500 {
 501         struct acpi_thermal *tz = data;
 502
 503         if (!tz->tz_enabled)
 504                 return;
 505
 506         thermal_zone_device_update(tz->thermal_zone,
 507                                    THERMAL_EVENT_UNSPECIFIED);
 508 }
 509
 510 /* sys I/F for generic thermal sysfs support */
 511
 512 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
 513 {
 514         struct acpi_thermal *tz = thermal->devdata;
 515         int result;
 516
 517         if (!tz)
 518                 return -EINVAL;
 519
 520         result = acpi_thermal_get_temperature(tz);
 521         if (result)
 522                 return result;
 523
 524         *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
 525                                                         tz->kelvin_offset);
 526         return 0;
 527 }
 528
 529 static int thermal_get_mode(struct thermal_zone_device *thermal,
 530                                 enum thermal_device_mode *mode)
 531 {
 532         struct acpi_thermal *tz = thermal->devdata;
 533
 534         if (!tz)
 535                 return -EINVAL;
 536
 537         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 538                 THERMAL_DEVICE_DISABLED;
 539
 540         return 0;
 541 }
 542
 543 static int thermal_set_mode(struct thermal_zone_device *thermal,
 544                                 enum thermal_device_mode mode)
 545 {
 546         struct acpi_thermal *tz = thermal->devdata;
 547         int enable;
 548
 549         if (!tz)
 550                 return -EINVAL;
 551
 552         /*
 553          * enable/disable thermal management from ACPI thermal driver
 554          */
 555         if (mode == THERMAL_DEVICE_ENABLED)
 556                 enable = 1;
 557         else if (mode == THERMAL_DEVICE_DISABLED) {
 558                 enable = 0;
 559                 pr_warn("thermal zone will be disabled\n");
 560         } else
 561                 return -EINVAL;
 562
 563         if (enable != tz->tz_enabled) {
 564                 tz->tz_enabled = enable;
 565                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 566                         "%s kernel ACPI thermal control\n",
 567                         tz->tz_enabled ? "Enable" : "Disable"));
 568                 acpi_thermal_check(tz);
 569         }
 570         return 0;
 571 }
 572
 573 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 574                                  int trip, enum thermal_trip_type *type)
 575 {
 576         struct acpi_thermal *tz = thermal->devdata;
 577         int i;
 578
 579         if (!tz || trip < 0)
 580                 return -EINVAL;
 581
 582         if (tz->trips.critical.flags.valid) {
 583                 if (!trip) {
 584                         *type = THERMAL_TRIP_CRITICAL;
 585                         return 0;
 586                 }
 587                 trip--;
 588         }
 589
 590         if (tz->trips.hot.flags.valid) {
 591                 if (!trip) {
 592                         *type = THERMAL_TRIP_HOT;
 593                         return 0;
 594                 }
 595                 trip--;
 596         }
 597
 598         if (tz->trips.passive.flags.valid) {
 599                 if (!trip) {
 600                         *type = THERMAL_TRIP_PASSIVE;
 601                         return 0;
 602                 }
 603                 trip--;
 604         }
 605
 606         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 607                 tz->trips.active[i].flags.valid; i++) {
 608                 if (!trip) {
 609                         *type = THERMAL_TRIP_ACTIVE;
 610                         return 0;
 611                 }
 612                 trip--;
 613         }
 614
 615         return -EINVAL;
 616 }
 617
 618 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 619                                  int trip, int *temp)
 620 {
 621         struct acpi_thermal *tz = thermal->devdata;
 622         int i;
 623
 624         if (!tz || trip < 0)
 625                 return -EINVAL;
 626
 627         if (tz->trips.critical.flags.valid) {
 628                 if (!trip) {
 629                         *temp = deci_kelvin_to_millicelsius_with_offset(
 630                                 tz->trips.critical.temperature,
 631                                 tz->kelvin_offset);
 632                         return 0;
 633                 }
 634                 trip--;
 635         }
 636
 637         if (tz->trips.hot.flags.valid) {
 638                 if (!trip) {
 639                         *temp = deci_kelvin_to_millicelsius_with_offset(
 640                                 tz->trips.hot.temperature,
 641                                 tz->kelvin_offset);
 642                         return 0;
 643                 }
 644                 trip--;
 645         }
 646
 647         if (tz->trips.passive.flags.valid) {
 648                 if (!trip) {
 649                         *temp = deci_kelvin_to_millicelsius_with_offset(
 650                                 tz->trips.passive.temperature,
 651                                 tz->kelvin_offset);
 652                         return 0;
 653                 }
 654                 trip--;
 655         }
 656
 657         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 658                 tz->trips.active[i].flags.valid; i++) {
 659                 if (!trip) {
 660                         *temp = deci_kelvin_to_millicelsius_with_offset(
 661                                 tz->trips.active[i].temperature,
 662                                 tz->kelvin_offset);
 663                         return 0;
 664                 }
 665                 trip--;
 666         }
 667
 668         return -EINVAL;
 669 }
 670
 671 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 672                                 int *temperature)
 673 {
 674         struct acpi_thermal *tz = thermal->devdata;
 675
 676         if (tz->trips.critical.flags.valid) {
 677                 *temperature = deci_kelvin_to_millicelsius_with_offset(
 678                                 tz->trips.critical.temperature,
 679                                 tz->kelvin_offset);
 680                 return 0;
 681         } else
 682                 return -EINVAL;
 683 }
 684
 685 static int thermal_get_trend(struct thermal_zone_device *thermal,
 686                                 int trip, enum thermal_trend *trend)
 687 {
 688         struct acpi_thermal *tz = thermal->devdata;
 689         enum thermal_trip_type type;
 690         int i;
 691
 692         if (thermal_get_trip_type(thermal, trip, &type))
 693                 return -EINVAL;
 694
 695         if (type == THERMAL_TRIP_ACTIVE) {
 696                 int trip_temp;
 697                 int temp = deci_kelvin_to_millicelsius_with_offset(
 698                                         tz->temperature, tz->kelvin_offset);
 699                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 700                         return -EINVAL;
 701
 702                 if (temp > trip_temp) {
 703                         *trend = THERMAL_TREND_RAISING;
 704                         return 0;
 705                 } else {
 706                         /* Fall back on default trend */
 707                         return -EINVAL;
 708                 }
 709         }
 710
 711         /*
 712          * tz->temperature has already been updated by generic thermal layer,
 713          * before this callback being invoked
 714          */
 715         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 716                 + (tz->trips.passive.tc2
 717                 * (tz->temperature - tz->trips.passive.temperature));
 718
 719         if (i > 0)
 720                 *trend = THERMAL_TREND_RAISING;
 721         else if (i < 0)
 722                 *trend = THERMAL_TREND_DROPPING;
 723         else
 724                 *trend = THERMAL_TREND_STABLE;
 725         return 0;
 726 }
 727
 728
 729 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 730                            enum thermal_trip_type trip_type)
 731 {
 732         u8 type = 0;
 733         struct acpi_thermal *tz = thermal->devdata;
 734
 735         if (trip_type == THERMAL_TRIP_CRITICAL)
 736                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 737         else if (trip_type == THERMAL_TRIP_HOT)
 738                 type = ACPI_THERMAL_NOTIFY_HOT;
 739         else
 740                 return 0;
 741
 742         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 743                                         dev_name(&tz->device->dev), type, 1);
 744
 745         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 746                 return 1;
 747
 748         return 0;
 749 }
 750
 751 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 752                                         struct thermal_cooling_device *cdev,
 753                                         bool bind)
 754 {
 755         struct acpi_device *device = cdev->devdata;
 756         struct acpi_thermal *tz = thermal->devdata;
 757         struct acpi_device *dev;
 758         acpi_status status;
 759         acpi_handle handle;
 760         int i;
 761         int j;
 762         int trip = -1;
 763         int result = 0;
 764
 765         if (tz->trips.critical.flags.valid)
 766                 trip++;
 767
 768         if (tz->trips.hot.flags.valid)
 769                 trip++;
 770
 771         if (tz->trips.passive.flags.valid) {
 772                 trip++;
 773                 for (i = 0; i < tz->trips.passive.devices.count;
 774                     i++) {
 775                         handle = tz->trips.passive.devices.handles[i];
 776                         status = acpi_bus_get_device(handle, &dev);
 777                         if (ACPI_FAILURE(status) || dev != device)
 778                                 continue;
 779                         if (bind)
 780                                 result =
 781                                         thermal_zone_bind_cooling_device
 782                                         (thermal, trip, cdev,
 783                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 784                                          THERMAL_WEIGHT_DEFAULT);
 785                         else
 786                                 result =
 787                                         thermal_zone_unbind_cooling_device
 788                                         (thermal, trip, cdev);
 789                         if (result)
 790                                 goto failed;
 791                 }
 792         }
 793
 794         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 795                 if (!tz->trips.active[i].flags.valid)
 796                         break;
 797                 trip++;
 798                 for (j = 0;
 799                     j < tz->trips.active[i].devices.count;
 800                     j++) {
 801                         handle = tz->trips.active[i].devices.handles[j];
 802                         status = acpi_bus_get_device(handle, &dev);
 803                         if (ACPI_FAILURE(status) || dev != device)
 804                                 continue;
 805                         if (bind)
 806                                 result = thermal_zone_bind_cooling_device
 807                                         (thermal, trip, cdev,
 808                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
 809                                          THERMAL_WEIGHT_DEFAULT);
 810                         else
 811                                 result = thermal_zone_unbind_cooling_device
 812                                         (thermal, trip, cdev);
 813                         if (result)
 814                                 goto failed;
 815                 }
 816         }
 817
 818         for (i = 0; i < tz->devices.count; i++) {
 819                 handle = tz->devices.handles[i];
 820                 status = acpi_bus_get_device(handle, &dev);
 821                 if (ACPI_SUCCESS(status) && (dev == device)) {
 822                         if (bind)
 823                                 result = thermal_zone_bind_cooling_device
 824                                                 (thermal, THERMAL_TRIPS_NONE,
 825                                                  cdev, THERMAL_NO_LIMIT,
 826                                                  THERMAL_NO_LIMIT,
 827                                                  THERMAL_WEIGHT_DEFAULT);
 828                         else
 829                                 result = thermal_zone_unbind_cooling_device
 830                                                 (thermal, THERMAL_TRIPS_NONE,
 831                                                  cdev);
 832                         if (result)
 833                                 goto failed;
 834                 }
 835         }
 836
 837 failed:
 838         return result;
 839 }
 840
 841 static int
 842 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 843                                         struct thermal_cooling_device *cdev)
 844 {
 845         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 846 }
 847
 848 static int
 849 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 850                                         struct thermal_cooling_device *cdev)
 851 {
 852         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 853 }
 854
 855 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 856         .bind = acpi_thermal_bind_cooling_device,
 857         .unbind = acpi_thermal_unbind_cooling_device,
 858         .get_temp = thermal_get_temp,
 859         .get_mode = thermal_get_mode,
 860         .set_mode = thermal_set_mode,
 861         .get_trip_type = thermal_get_trip_type,
 862         .get_trip_temp = thermal_get_trip_temp,
 863         .get_crit_temp = thermal_get_crit_temp,
 864         .get_trend = thermal_get_trend,
 865         .notify = thermal_notify,
 866 };
 867
 868 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 869 {
 870         int trips = 0;
 871         int result;
 872         acpi_status status;
 873         int i;
 874
 875         if (tz->trips.critical.flags.valid)
 876                 trips++;
 877
 878         if (tz->trips.hot.flags.valid)
 879                 trips++;
 880
 881         if (tz->trips.passive.flags.valid)
 882                 trips++;
 883
 884         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 885                         tz->trips.active[i].flags.valid; i++, trips++);
 886
 887         if (tz->trips.passive.flags.valid)
 888                 tz->thermal_zone =
 889                         thermal_zone_device_register("acpitz", trips, 0, tz,
 890                                                 &acpi_thermal_zone_ops, NULL,
 891                                                      tz->trips.passive.tsp*100,
 892                                                      tz->polling_frequency*100);
 893         else
 894                 tz->thermal_zone =
 895                         thermal_zone_device_register("acpitz", trips, 0, tz,
 896                                                 &acpi_thermal_zone_ops, NULL,
 897                                                 0, tz->polling_frequency*100);
 898         if (IS_ERR(tz->thermal_zone))
 899                 return -ENODEV;
 900
 901         result = sysfs_create_link(&tz->device->dev.kobj,
 902                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 903         if (result)
 904                 return result;
 905
 906         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 907                                    &tz->device->dev.kobj, "device");
 908         if (result)
 909                 return result;
 910
 911         status =  acpi_bus_attach_private_data(tz->device->handle,
 912                                                tz->thermal_zone);
 913         if (ACPI_FAILURE(status))
 914                 return -ENODEV;
 915
 916         tz->tz_enabled = 1;
 917
 918         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 919                  tz->thermal_zone->id);
 920         return 0;
 921 }
 922
 923 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 924 {
 925         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 926         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 927         thermal_zone_device_unregister(tz->thermal_zone);
 928         tz->thermal_zone = NULL;
 929         acpi_bus_detach_private_data(tz->device->handle);
 930 }
 931
 932
 933 /* --------------------------------------------------------------------------
 934                                  Driver Interface
 935    -------------------------------------------------------------------------- */
 936
 937 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 938 {
 939         struct acpi_thermal *tz = acpi_driver_data(device);
 940
 941
 942         if (!tz)
 943                 return;
 944
 945         switch (event) {
 946         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 947                 acpi_thermal_check(tz);
 948                 break;
 949         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 950                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 951                 acpi_thermal_check(tz);
 952                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 953                                                   dev_name(&device->dev), event, 0);
 954                 break;
 955         case ACPI_THERMAL_NOTIFY_DEVICES:
 956                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 957                 acpi_thermal_check(tz);
 958                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 959                                                   dev_name(&device->dev), event, 0);
 960                 break;
 961         default:
 962                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 963                                   "Unsupported event [0x%x]\n", event));
 964                 break;
 965         }
 966 }
 967
 968 /*
 969  * On some platforms, the AML code has dependency about
 970  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 971  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 972  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 973  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 974  *    if _TMP has never been evaluated.
 975  *
 976  * As this dependency is totally transparent to OS, evaluate
 977  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
 978  * _TMP, before they are actually used.
 979  */
 980 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 981 {
 982         acpi_handle handle = tz->device->handle;
 983         unsigned long long value;
 984         int i;
 985
 986         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
 987         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
 988         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
 989         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 990                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 991                 acpi_status status;
 992
 993                 status = acpi_evaluate_integer(handle, name, NULL, &value);
 994                 if (status == AE_NOT_FOUND)
 995                         break;
 996         }
 997         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
 998 }
 999
1000 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1001 {
1002         int result = 0;
1003
1004
1005         if (!tz)
1006                 return -EINVAL;
1007
1008         acpi_thermal_aml_dependency_fix(tz);
1009
1010         /* Get trip points [_CRT, _PSV, etc.] (required) */
1011         result = acpi_thermal_get_trip_points(tz);
1012         if (result)
1013                 return result;
1014
1015         /* Get temperature [_TMP] (required) */
1016         result = acpi_thermal_get_temperature(tz);
1017         if (result)
1018                 return result;
1019
1020         /* Set the cooling mode [_SCP] to active cooling (default) */
1021         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1022         if (!result)
1023                 tz->flags.cooling_mode = 1;
1024
1025         /* Get default polling frequency [_TZP] (optional) */
1026         if (tzp)
1027                 tz->polling_frequency = tzp;
1028         else
1029                 acpi_thermal_get_polling_frequency(tz);
1030
1031         return 0;
1032 }
1033
1034 /*
1035  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1036  * handles temperature values with a single decimal place. As a consequence,
1037  * some implementations use an offset of 273.1 and others use an offset of
1038  * 273.2. Try to find out which one is being used, to present the most
1039  * accurate and visually appealing number.
1040  *
1041  * The heuristic below should work for all ACPI thermal zones which have a
1042  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1043  */
1044 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1045 {
1046         if (tz->trips.critical.flags.valid &&
1047             (tz->trips.critical.temperature % 5) == 1)
1048                 tz->kelvin_offset = 273100;
1049         else
1050                 tz->kelvin_offset = 273200;
1051 }
1052
1053 static void acpi_thermal_check_fn(struct work_struct *work)
1054 {
1055         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1056                                                thermal_check_work);
1057         acpi_thermal_check(tz);
1058 }
1059
1060 static int acpi_thermal_add(struct acpi_device *device)
1061 {
1062         int result = 0;
1063         struct acpi_thermal *tz = NULL;
1064
1065
1066         if (!device)
1067                 return -EINVAL;
1068
1069         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1070         if (!tz)
1071                 return -ENOMEM;
1072
1073         tz->device = device;
1074         strcpy(tz->name, device->pnp.bus_id);
1075         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1076         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1077         device->driver_data = tz;
1078
1079         result = acpi_thermal_get_info(tz);
1080         if (result)
1081                 goto free_memory;
1082
1083         acpi_thermal_guess_offset(tz);
1084
1085         result = acpi_thermal_register_thermal_zone(tz);
1086         if (result)
1087                 goto free_memory;
1088
1089         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1090
1091         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1092                 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1093         goto end;
1094
1095 free_memory:
1096         kfree(tz);
1097 end:
1098         return result;
1099 }
1100
1101 static int acpi_thermal_remove(struct acpi_device *device)
1102 {
1103         struct acpi_thermal *tz = NULL;
1104
1105         if (!device || !acpi_driver_data(device))
1106                 return -EINVAL;
1107
1108         flush_workqueue(acpi_thermal_pm_queue);
1109         tz = acpi_driver_data(device);
1110
1111         acpi_thermal_unregister_thermal_zone(tz);
1112         kfree(tz);
1113         return 0;
1114 }
1115
1116 #ifdef CONFIG_PM_SLEEP
1117 static int acpi_thermal_suspend(struct device *dev)
1118 {
1119         /* Make sure the previously queued thermal check work has been done */
1120         flush_workqueue(acpi_thermal_pm_queue);
1121         return 0;
1122 }
1123
1124 static int acpi_thermal_resume(struct device *dev)
1125 {
1126         struct acpi_thermal *tz;
1127         int i, j, power_state, result;
1128
1129         if (!dev)
1130                 return -EINVAL;
1131
1132         tz = acpi_driver_data(to_acpi_device(dev));
1133         if (!tz)
1134                 return -EINVAL;
1135
1136         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1137                 if (!(&tz->trips.active[i]))
1138                         break;
1139                 if (!tz->trips.active[i].flags.valid)
1140                         break;
1141                 tz->trips.active[i].flags.enabled = 1;
1142                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1143                         result = acpi_bus_update_power(
1144                                         tz->trips.active[i].devices.handles[j],
1145                                         &power_state);
1146                         if (result || (power_state != ACPI_STATE_D0)) {
1147                                 tz->trips.active[i].flags.enabled = 0;
1148                                 break;
1149                         }
1150                 }
1151                 tz->state.active |= tz->trips.active[i].flags.enabled;
1152         }
1153
1154         queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1155
1156         return AE_OK;
1157 }
1158 #endif
1159
1160 static int thermal_act(const struct dmi_system_id *d) {
1161
1162         if (act == 0) {
1163                 pr_notice(PREFIX "%s detected: "
1164                           "disabling all active thermal trip points\n", d->ident);
1165                 act = -1;
1166         }
1167         return 0;
1168 }
1169 static int thermal_nocrt(const struct dmi_system_id *d) {
1170
1171         pr_notice(PREFIX "%s detected: "
1172                   "disabling all critical thermal trip point actions.\n", d->ident);
1173         nocrt = 1;
1174         return 0;
1175 }
1176 static int thermal_tzp(const struct dmi_system_id *d) {
1177
1178         if (tzp == 0) {
1179                 pr_notice(PREFIX "%s detected: "
1180                           "enabling thermal zone polling\n", d->ident);
1181                 tzp = 300;      /* 300 dS = 30 Seconds */
1182         }
1183         return 0;
1184 }
1185 static int thermal_psv(const struct dmi_system_id *d) {
1186
1187         if (psv == 0) {
1188                 pr_notice(PREFIX "%s detected: "
1189                           "disabling all passive thermal trip points\n", d->ident);
1190                 psv = -1;
1191         }
1192         return 0;
1193 }
1194
1195 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1196         /*
1197          * Award BIOS on this AOpen makes thermal control almost worthless.
1198          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1199          */
1200         {
1201          .callback = thermal_act,
1202          .ident = "AOpen i915GMm-HFS",
1203          .matches = {
1204                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1205                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1206                 },
1207         },
1208         {
1209          .callback = thermal_psv,
1210          .ident = "AOpen i915GMm-HFS",
1211          .matches = {
1212                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1213                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1214                 },
1215         },
1216         {
1217          .callback = thermal_tzp,
1218          .ident = "AOpen i915GMm-HFS",
1219          .matches = {
1220                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1221                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1222                 },
1223         },
1224         {
1225          .callback = thermal_nocrt,
1226          .ident = "Gigabyte GA-7ZX",
1227          .matches = {
1228                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1229                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1230                 },
1231         },
1232         {}
1233 };
1234
1235 static int __init acpi_thermal_init(void)
1236 {
1237         int result = 0;
1238
1239         dmi_check_system(thermal_dmi_table);
1240
1241         if (off) {
1242                 pr_notice(PREFIX "thermal control disabled\n");
1243                 return -ENODEV;
1244         }
1245
1246         acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1247                                                 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1248         if (!acpi_thermal_pm_queue)
1249                 return -ENODEV;
1250
1251         result = acpi_bus_register_driver(&acpi_thermal_driver);
1252         if (result < 0) {
1253                 destroy_workqueue(acpi_thermal_pm_queue);
1254                 return -ENODEV;
1255         }
1256
1257         return 0;
1258 }
1259
1260 static void __exit acpi_thermal_exit(void)
1261 {
1262         acpi_bus_unregister_driver(&acpi_thermal_driver);
1263         destroy_workqueue(acpi_thermal_pm_queue);
1264
1265         return;
1266 }
1267
1268 module_init(acpi_thermal_init);
1269 module_exit(acpi_thermal_exit);