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