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