drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/slab.h>
  39 #include <linux/types.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/reboot.h>
  43 #include <linux/device.h>
  44 #include <linux/thermal.h>
  45 #include <linux/acpi.h>
  46 #include <asm/uaccess.h>
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  53 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  54 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  55 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  56 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  57 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  58
  59 #define ACPI_THERMAL_MAX_ACTIVE 10
  60 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  61
  62 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  63 ACPI_MODULE_NAME("thermal");
  64
  65 MODULE_AUTHOR("Paul Diefenbaugh");
  66 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  67 MODULE_LICENSE("GPL");
  68
  69 static int act;
  70 module_param(act, int, 0644);
  71 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  72
  73 static int crt;
  74 module_param(crt, int, 0644);
  75 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  76
  77 static int tzp;
  78 module_param(tzp, int, 0444);
  79 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  80
  81 static int nocrt;
  82 module_param(nocrt, int, 0);
  83 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  84
  85 static int off;
  86 module_param(off, int, 0);
  87 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  88
  89 static int psv;
  90 module_param(psv, int, 0644);
  91 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  92
  93 static int acpi_thermal_add(struct acpi_device *device);
  94 static int acpi_thermal_remove(struct acpi_device *device);
  95 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
  96
  97 static const struct acpi_device_id  thermal_device_ids[] = {
  98         {ACPI_THERMAL_HID, 0},
  99         {"", 0},
 100 };
 101 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 102
 103 #ifdef CONFIG_PM_SLEEP
 104 static int acpi_thermal_resume(struct device *dev);
 105 #endif
 106 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
 107
 108 static struct acpi_driver acpi_thermal_driver = {
 109         .name = "thermal",
 110         .class = ACPI_THERMAL_CLASS,
 111         .ids = thermal_device_ids,
 112         .ops = {
 113                 .add = acpi_thermal_add,
 114                 .remove = acpi_thermal_remove,
 115                 .notify = acpi_thermal_notify,
 116                 },
 117         .drv.pm = &acpi_thermal_pm,
 118 };
 119
 120 struct acpi_thermal_state {
 121         u8 critical:1;
 122         u8 hot:1;
 123         u8 passive:1;
 124         u8 active:1;
 125         u8 reserved:4;
 126         int active_index;
 127 };
 128
 129 struct acpi_thermal_state_flags {
 130         u8 valid:1;
 131         u8 enabled:1;
 132         u8 reserved:6;
 133 };
 134
 135 struct acpi_thermal_critical {
 136         struct acpi_thermal_state_flags flags;
 137         unsigned long temperature;
 138 };
 139
 140 struct acpi_thermal_hot {
 141         struct acpi_thermal_state_flags flags;
 142         unsigned long temperature;
 143 };
 144
 145 struct acpi_thermal_passive {
 146         struct acpi_thermal_state_flags flags;
 147         unsigned long temperature;
 148         unsigned long tc1;
 149         unsigned long tc2;
 150         unsigned long tsp;
 151         struct acpi_handle_list devices;
 152 };
 153
 154 struct acpi_thermal_active {
 155         struct acpi_thermal_state_flags flags;
 156         unsigned long temperature;
 157         struct acpi_handle_list devices;
 158 };
 159
 160 struct acpi_thermal_trips {
 161         struct acpi_thermal_critical critical;
 162         struct acpi_thermal_hot hot;
 163         struct acpi_thermal_passive passive;
 164         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 165 };
 166
 167 struct acpi_thermal_flags {
 168         u8 cooling_mode:1;      /* _SCP */
 169         u8 devices:1;           /* _TZD */
 170         u8 reserved:6;
 171 };
 172
 173 struct acpi_thermal {
 174         struct acpi_device * device;
 175         acpi_bus_id name;
 176         unsigned long temperature;
 177         unsigned long last_temperature;
 178         unsigned long polling_frequency;
 179         volatile u8 zombie;
 180         struct acpi_thermal_flags flags;
 181         struct acpi_thermal_state state;
 182         struct acpi_thermal_trips trips;
 183         struct acpi_handle_list devices;
 184         struct thermal_zone_device *thermal_zone;
 185         int tz_enabled;
 186         int kelvin_offset;
 187 };
 188
 189 /* --------------------------------------------------------------------------
 190                              Thermal Zone Management
 191    -------------------------------------------------------------------------- */
 192
 193 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 194 {
 195         acpi_status status = AE_OK;
 196         unsigned long long tmp;
 197
 198         if (!tz)
 199                 return -EINVAL;
 200
 201         tz->last_temperature = tz->temperature;
 202
 203         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 204         if (ACPI_FAILURE(status))
 205                 return -ENODEV;
 206
 207         tz->temperature = tmp;
 208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 209                           tz->temperature));
 210
 211         return 0;
 212 }
 213
 214 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 215 {
 216         acpi_status status = AE_OK;
 217         unsigned long long tmp;
 218
 219         if (!tz)
 220                 return -EINVAL;
 221
 222         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 223         if (ACPI_FAILURE(status))
 224                 return -ENODEV;
 225
 226         tz->polling_frequency = tmp;
 227         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 228                           tz->polling_frequency));
 229
 230         return 0;
 231 }
 232
 233 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 234 {
 235         if (!tz)
 236                 return -EINVAL;
 237
 238         if (!acpi_has_method(tz->device->handle, "_SCP")) {
 239                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 240                 return -ENODEV;
 241         } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
 242                                                            "_SCP", mode))) {
 243                 return -ENODEV;
 244         }
 245
 246         return 0;
 247 }
 248
 249 #define ACPI_TRIPS_CRITICAL     0x01
 250 #define ACPI_TRIPS_HOT          0x02
 251 #define ACPI_TRIPS_PASSIVE      0x04
 252 #define ACPI_TRIPS_ACTIVE       0x08
 253 #define ACPI_TRIPS_DEVICES      0x10
 254
 255 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 256 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 257
 258 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 259                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 260                               ACPI_TRIPS_DEVICES)
 261
 262 /*
 263  * This exception is thrown out in two cases:
 264  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 265  *   when re-evaluating the AML code.
 266  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 267  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 268  */
 269 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 270 do {    \
 271         if (flags != ACPI_TRIPS_INIT)   \
 272                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 273                 "ACPI thermal trip point %s changed\n"  \
 274                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 275 } while (0)
 276
 277 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 278 {
 279         acpi_status status = AE_OK;
 280         unsigned long long tmp;
 281         struct acpi_handle_list devices;
 282         int valid = 0;
 283         int i;
 284
 285         /* Critical Shutdown */
 286         if (flag & ACPI_TRIPS_CRITICAL) {
 287                 status = acpi_evaluate_integer(tz->device->handle,
 288                                 "_CRT", NULL, &tmp);
 289                 tz->trips.critical.temperature = tmp;
 290                 /*
 291                  * Treat freezing temperatures as invalid as well; some
 292                  * BIOSes return really low values and cause reboots at startup.
 293                  * Below zero (Celsius) values clearly aren't right for sure..
 294                  * ... so lets discard those as invalid.
 295                  */
 296                 if (ACPI_FAILURE(status)) {
 297                         tz->trips.critical.flags.valid = 0;
 298                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 299                                           "No critical threshold\n"));
 300                 } else if (tmp <= 2732) {
 301                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
 302                                 tmp);
 303                         tz->trips.critical.flags.valid = 0;
 304                 } else {
 305                         tz->trips.critical.flags.valid = 1;
 306                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 307                                           "Found critical threshold [%lu]\n",
 308                                           tz->trips.critical.temperature));
 309                 }
 310                 if (tz->trips.critical.flags.valid == 1) {
 311                         if (crt == -1) {
 312                                 tz->trips.critical.flags.valid = 0;
 313                         } else if (crt > 0) {
 314                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 315                                 /*
 316                                  * Allow override critical threshold
 317                                  */
 318                                 if (crt_k > tz->trips.critical.temperature)
 319                                         pr_warn(PREFIX "Critical threshold %d C\n",
 320                                                 crt);
 321                                 tz->trips.critical.temperature = crt_k;
 322                         }
 323                 }
 324         }
 325
 326         /* Critical Sleep (optional) */
 327         if (flag & ACPI_TRIPS_HOT) {
 328                 status = acpi_evaluate_integer(tz->device->handle,
 329                                 "_HOT", NULL, &tmp);
 330                 if (ACPI_FAILURE(status)) {
 331                         tz->trips.hot.flags.valid = 0;
 332                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 333                                         "No hot threshold\n"));
 334                 } else {
 335                         tz->trips.hot.temperature = tmp;
 336                         tz->trips.hot.flags.valid = 1;
 337                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 338                                         "Found hot threshold [%lu]\n",
 339                                         tz->trips.critical.temperature));
 340                 }
 341         }
 342
 343         /* Passive (optional) */
 344         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 345                 (flag == ACPI_TRIPS_INIT)) {
 346                 valid = tz->trips.passive.flags.valid;
 347                 if (psv == -1) {
 348                         status = AE_SUPPORT;
 349                 } else if (psv > 0) {
 350                         tmp = CELSIUS_TO_KELVIN(psv);
 351                         status = AE_OK;
 352                 } else {
 353                         status = acpi_evaluate_integer(tz->device->handle,
 354                                 "_PSV", NULL, &tmp);
 355                 }
 356
 357                 if (ACPI_FAILURE(status))
 358                         tz->trips.passive.flags.valid = 0;
 359                 else {
 360                         tz->trips.passive.temperature = tmp;
 361                         tz->trips.passive.flags.valid = 1;
 362                         if (flag == ACPI_TRIPS_INIT) {
 363                                 status = acpi_evaluate_integer(
 364                                                 tz->device->handle, "_TC1",
 365                                                 NULL, &tmp);
 366                                 if (ACPI_FAILURE(status))
 367                                         tz->trips.passive.flags.valid = 0;
 368                                 else
 369                                         tz->trips.passive.tc1 = tmp;
 370                                 status = acpi_evaluate_integer(
 371                                                 tz->device->handle, "_TC2",
 372                                                 NULL, &tmp);
 373                                 if (ACPI_FAILURE(status))
 374                                         tz->trips.passive.flags.valid = 0;
 375                                 else
 376                                         tz->trips.passive.tc2 = tmp;
 377                                 status = acpi_evaluate_integer(
 378                                                 tz->device->handle, "_TSP",
 379                                                 NULL, &tmp);
 380                                 if (ACPI_FAILURE(status))
 381                                         tz->trips.passive.flags.valid = 0;
 382                                 else
 383                                         tz->trips.passive.tsp = tmp;
 384                         }
 385                 }
 386         }
 387         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 388                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 389                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 390                                                         NULL, &devices);
 391                 if (ACPI_FAILURE(status)) {
 392                         pr_warn(PREFIX "Invalid passive threshold\n");
 393                         tz->trips.passive.flags.valid = 0;
 394                 }
 395                 else
 396                         tz->trips.passive.flags.valid = 1;
 397
 398                 if (memcmp(&tz->trips.passive.devices, &devices,
 399                                 sizeof(struct acpi_handle_list))) {
 400                         memcpy(&tz->trips.passive.devices, &devices,
 401                                 sizeof(struct acpi_handle_list));
 402                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 403                 }
 404         }
 405         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 406                 if (valid != tz->trips.passive.flags.valid)
 407                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 408         }
 409
 410         /* Active (optional) */
 411         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 412                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 413                 valid = tz->trips.active[i].flags.valid;
 414
 415                 if (act == -1)
 416                         break; /* disable all active trip points */
 417
 418                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 419                         tz->trips.active[i].flags.valid)) {
 420                         status = acpi_evaluate_integer(tz->device->handle,
 421                                                         name, NULL, &tmp);
 422                         if (ACPI_FAILURE(status)) {
 423                                 tz->trips.active[i].flags.valid = 0;
 424                                 if (i == 0)
 425                                         break;
 426                                 if (act <= 0)
 427                                         break;
 428                                 if (i == 1)
 429                                         tz->trips.active[0].temperature =
 430                                                 CELSIUS_TO_KELVIN(act);
 431                                 else
 432                                         /*
 433                                          * Don't allow override higher than
 434                                          * the next higher trip point
 435                                          */
 436                                         tz->trips.active[i - 1].temperature =
 437                                                 (tz->trips.active[i - 2].temperature <
 438                                                 CELSIUS_TO_KELVIN(act) ?
 439                                                 tz->trips.active[i - 2].temperature :
 440                                                 CELSIUS_TO_KELVIN(act));
 441                                 break;
 442                         } else {
 443                                 tz->trips.active[i].temperature = tmp;
 444                                 tz->trips.active[i].flags.valid = 1;
 445                         }
 446                 }
 447
 448                 name[2] = 'L';
 449                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 450                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 451                         status = acpi_evaluate_reference(tz->device->handle,
 452                                                 name, NULL, &devices);
 453                         if (ACPI_FAILURE(status)) {
 454                                 pr_warn(PREFIX "Invalid active%d threshold\n",
 455                                         i);
 456                                 tz->trips.active[i].flags.valid = 0;
 457                         }
 458                         else
 459                                 tz->trips.active[i].flags.valid = 1;
 460
 461                         if (memcmp(&tz->trips.active[i].devices, &devices,
 462                                         sizeof(struct acpi_handle_list))) {
 463                                 memcpy(&tz->trips.active[i].devices, &devices,
 464                                         sizeof(struct acpi_handle_list));
 465                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 466                         }
 467                 }
 468                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 469                         if (valid != tz->trips.active[i].flags.valid)
 470                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 471
 472                 if (!tz->trips.active[i].flags.valid)
 473                         break;
 474         }
 475
 476         if ((flag & ACPI_TRIPS_DEVICES)
 477             && acpi_has_method(tz->device->handle, "_TZD")) {
 478                 memset(&devices, 0, sizeof(devices));
 479                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 480                                                 NULL, &devices);
 481                 if (ACPI_SUCCESS(status)
 482                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
 483                         tz->devices = devices;
 484                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 485                 }
 486         }
 487
 488         return 0;
 489 }
 490
 491 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 492 {
 493         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 494
 495         if (ret)
 496                 return ret;
 497
 498         valid = tz->trips.critical.flags.valid |
 499                 tz->trips.hot.flags.valid |
 500                 tz->trips.passive.flags.valid;
 501
 502         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 503                 valid |= tz->trips.active[i].flags.valid;
 504
 505         if (!valid) {
 506                 pr_warn(FW_BUG "No valid trip found\n");
 507                 return -ENODEV;
 508         }
 509         return 0;
 510 }
 511
 512 static void acpi_thermal_check(void *data)
 513 {
 514         struct acpi_thermal *tz = data;
 515
 516         if (!tz->tz_enabled)
 517                 return;
 518
 519         thermal_zone_device_update(tz->thermal_zone);
 520 }
 521
 522 /* sys I/F for generic thermal sysfs support */
 523 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 524
 525 static int thermal_get_temp(struct thermal_zone_device *thermal,
 526                             unsigned long *temp)
 527 {
 528         struct acpi_thermal *tz = thermal->devdata;
 529         int result;
 530
 531         if (!tz)
 532                 return -EINVAL;
 533
 534         result = acpi_thermal_get_temperature(tz);
 535         if (result)
 536                 return result;
 537
 538         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 539         return 0;
 540 }
 541
 542 static int thermal_get_mode(struct thermal_zone_device *thermal,
 543                                 enum thermal_device_mode *mode)
 544 {
 545         struct acpi_thermal *tz = thermal->devdata;
 546
 547         if (!tz)
 548                 return -EINVAL;
 549
 550         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 551                 THERMAL_DEVICE_DISABLED;
 552
 553         return 0;
 554 }
 555
 556 static int thermal_set_mode(struct thermal_zone_device *thermal,
 557                                 enum thermal_device_mode mode)
 558 {
 559         struct acpi_thermal *tz = thermal->devdata;
 560         int enable;
 561
 562         if (!tz)
 563                 return -EINVAL;
 564
 565         /*
 566          * enable/disable thermal management from ACPI thermal driver
 567          */
 568         if (mode == THERMAL_DEVICE_ENABLED)
 569                 enable = 1;
 570         else if (mode == THERMAL_DEVICE_DISABLED) {
 571                 enable = 0;
 572                 pr_warn("thermal zone will be disabled\n");
 573         } else
 574                 return -EINVAL;
 575
 576         if (enable != tz->tz_enabled) {
 577                 tz->tz_enabled = enable;
 578                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 579                         "%s kernel ACPI thermal control\n",
 580                         tz->tz_enabled ? "Enable" : "Disable"));
 581                 acpi_thermal_check(tz);
 582         }
 583         return 0;
 584 }
 585
 586 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 587                                  int trip, enum thermal_trip_type *type)
 588 {
 589         struct acpi_thermal *tz = thermal->devdata;
 590         int i;
 591
 592         if (!tz || trip < 0)
 593                 return -EINVAL;
 594
 595         if (tz->trips.critical.flags.valid) {
 596                 if (!trip) {
 597                         *type = THERMAL_TRIP_CRITICAL;
 598                         return 0;
 599                 }
 600                 trip--;
 601         }
 602
 603         if (tz->trips.hot.flags.valid) {
 604                 if (!trip) {
 605                         *type = THERMAL_TRIP_HOT;
 606                         return 0;
 607                 }
 608                 trip--;
 609         }
 610
 611         if (tz->trips.passive.flags.valid) {
 612                 if (!trip) {
 613                         *type = THERMAL_TRIP_PASSIVE;
 614                         return 0;
 615                 }
 616                 trip--;
 617         }
 618
 619         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 620                 tz->trips.active[i].flags.valid; i++) {
 621                 if (!trip) {
 622                         *type = THERMAL_TRIP_ACTIVE;
 623                         return 0;
 624                 }
 625                 trip--;
 626         }
 627
 628         return -EINVAL;
 629 }
 630
 631 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 632                                  int trip, unsigned long *temp)
 633 {
 634         struct acpi_thermal *tz = thermal->devdata;
 635         int i;
 636
 637         if (!tz || trip < 0)
 638                 return -EINVAL;
 639
 640         if (tz->trips.critical.flags.valid) {
 641                 if (!trip) {
 642                         *temp = KELVIN_TO_MILLICELSIUS(
 643                                 tz->trips.critical.temperature,
 644                                 tz->kelvin_offset);
 645                         return 0;
 646                 }
 647                 trip--;
 648         }
 649
 650         if (tz->trips.hot.flags.valid) {
 651                 if (!trip) {
 652                         *temp = KELVIN_TO_MILLICELSIUS(
 653                                 tz->trips.hot.temperature,
 654                                 tz->kelvin_offset);
 655                         return 0;
 656                 }
 657                 trip--;
 658         }
 659
 660         if (tz->trips.passive.flags.valid) {
 661                 if (!trip) {
 662                         *temp = KELVIN_TO_MILLICELSIUS(
 663                                 tz->trips.passive.temperature,
 664                                 tz->kelvin_offset);
 665                         return 0;
 666                 }
 667                 trip--;
 668         }
 669
 670         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 671                 tz->trips.active[i].flags.valid; i++) {
 672                 if (!trip) {
 673                         *temp = KELVIN_TO_MILLICELSIUS(
 674                                 tz->trips.active[i].temperature,
 675                                 tz->kelvin_offset);
 676                         return 0;
 677                 }
 678                 trip--;
 679         }
 680
 681         return -EINVAL;
 682 }
 683
 684 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 685                                 unsigned long *temperature) {
 686         struct acpi_thermal *tz = thermal->devdata;
 687
 688         if (tz->trips.critical.flags.valid) {
 689                 *temperature = KELVIN_TO_MILLICELSIUS(
 690                                 tz->trips.critical.temperature,
 691                                 tz->kelvin_offset);
 692                 return 0;
 693         } else
 694                 return -EINVAL;
 695 }
 696
 697 static int thermal_get_trend(struct thermal_zone_device *thermal,
 698                                 int trip, enum thermal_trend *trend)
 699 {
 700         struct acpi_thermal *tz = thermal->devdata;
 701         enum thermal_trip_type type;
 702         int i;
 703
 704         if (thermal_get_trip_type(thermal, trip, &type))
 705                 return -EINVAL;
 706
 707         if (type == THERMAL_TRIP_ACTIVE) {
 708                 unsigned long trip_temp;
 709                 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
 710                                                         tz->kelvin_offset);
 711                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 712                         return -EINVAL;
 713
 714                 if (temp > trip_temp) {
 715                         *trend = THERMAL_TREND_RAISING;
 716                         return 0;
 717                 } else {
 718                         /* Fall back on default trend */
 719                         return -EINVAL;
 720                 }
 721         }
 722
 723         /*
 724          * tz->temperature has already been updated by generic thermal layer,
 725          * before this callback being invoked
 726          */
 727         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 728                 + (tz->trips.passive.tc2
 729                 * (tz->temperature - tz->trips.passive.temperature));
 730
 731         if (i > 0)
 732                 *trend = THERMAL_TREND_RAISING;
 733         else if (i < 0)
 734                 *trend = THERMAL_TREND_DROPPING;
 735         else
 736                 *trend = THERMAL_TREND_STABLE;
 737         return 0;
 738 }
 739
 740
 741 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 742                            enum thermal_trip_type trip_type)
 743 {
 744         u8 type = 0;
 745         struct acpi_thermal *tz = thermal->devdata;
 746
 747         if (trip_type == THERMAL_TRIP_CRITICAL)
 748                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 749         else if (trip_type == THERMAL_TRIP_HOT)
 750                 type = ACPI_THERMAL_NOTIFY_HOT;
 751         else
 752                 return 0;
 753
 754         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 755                                         dev_name(&tz->device->dev), type, 1);
 756
 757         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 758                 return 1;
 759
 760         return 0;
 761 }
 762
 763 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 764                                         struct thermal_cooling_device *cdev,
 765                                         bool bind)
 766 {
 767         struct acpi_device *device = cdev->devdata;
 768         struct acpi_thermal *tz = thermal->devdata;
 769         struct acpi_device *dev;
 770         acpi_status status;
 771         acpi_handle handle;
 772         int i;
 773         int j;
 774         int trip = -1;
 775         int result = 0;
 776
 777         if (tz->trips.critical.flags.valid)
 778                 trip++;
 779
 780         if (tz->trips.hot.flags.valid)
 781                 trip++;
 782
 783         if (tz->trips.passive.flags.valid) {
 784                 trip++;
 785                 for (i = 0; i < tz->trips.passive.devices.count;
 786                     i++) {
 787                         handle = tz->trips.passive.devices.handles[i];
 788                         status = acpi_bus_get_device(handle, &dev);
 789                         if (ACPI_FAILURE(status) || dev != device)
 790                                 continue;
 791                         if (bind)
 792                                 result =
 793                                         thermal_zone_bind_cooling_device
 794                                         (thermal, trip, cdev,
 795                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 796                         else
 797                                 result =
 798                                         thermal_zone_unbind_cooling_device
 799                                         (thermal, trip, cdev);
 800                         if (result)
 801                                 goto failed;
 802                 }
 803         }
 804
 805         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 806                 if (!tz->trips.active[i].flags.valid)
 807                         break;
 808                 trip++;
 809                 for (j = 0;
 810                     j < tz->trips.active[i].devices.count;
 811                     j++) {
 812                         handle = tz->trips.active[i].devices.handles[j];
 813                         status = acpi_bus_get_device(handle, &dev);
 814                         if (ACPI_FAILURE(status) || dev != device)
 815                                 continue;
 816                         if (bind)
 817                                 result = thermal_zone_bind_cooling_device
 818                                         (thermal, trip, cdev,
 819                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 820                         else
 821                                 result = thermal_zone_unbind_cooling_device
 822                                         (thermal, trip, cdev);
 823                         if (result)
 824                                 goto failed;
 825                 }
 826         }
 827
 828         for (i = 0; i < tz->devices.count; i++) {
 829                 handle = tz->devices.handles[i];
 830                 status = acpi_bus_get_device(handle, &dev);
 831                 if (ACPI_SUCCESS(status) && (dev == device)) {
 832                         if (bind)
 833                                 result = thermal_zone_bind_cooling_device
 834                                                 (thermal, THERMAL_TRIPS_NONE,
 835                                                  cdev, THERMAL_NO_LIMIT,
 836                                                  THERMAL_NO_LIMIT);
 837                         else
 838                                 result = thermal_zone_unbind_cooling_device
 839                                                 (thermal, THERMAL_TRIPS_NONE,
 840                                                  cdev);
 841                         if (result)
 842                                 goto failed;
 843                 }
 844         }
 845
 846 failed:
 847         return result;
 848 }
 849
 850 static int
 851 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 852                                         struct thermal_cooling_device *cdev)
 853 {
 854         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 855 }
 856
 857 static int
 858 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 859                                         struct thermal_cooling_device *cdev)
 860 {
 861         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 862 }
 863
 864 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 865         .bind = acpi_thermal_bind_cooling_device,
 866         .unbind = acpi_thermal_unbind_cooling_device,
 867         .get_temp = thermal_get_temp,
 868         .get_mode = thermal_get_mode,
 869         .set_mode = thermal_set_mode,
 870         .get_trip_type = thermal_get_trip_type,
 871         .get_trip_temp = thermal_get_trip_temp,
 872         .get_crit_temp = thermal_get_crit_temp,
 873         .get_trend = thermal_get_trend,
 874         .notify = thermal_notify,
 875 };
 876
 877 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 878 {
 879         int trips = 0;
 880         int result;
 881         acpi_status status;
 882         int i;
 883
 884         if (tz->trips.critical.flags.valid)
 885                 trips++;
 886
 887         if (tz->trips.hot.flags.valid)
 888                 trips++;
 889
 890         if (tz->trips.passive.flags.valid)
 891                 trips++;
 892
 893         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 894                         tz->trips.active[i].flags.valid; i++, trips++);
 895
 896         if (tz->trips.passive.flags.valid)
 897                 tz->thermal_zone =
 898                         thermal_zone_device_register("acpitz", trips, 0, tz,
 899                                                 &acpi_thermal_zone_ops, NULL,
 900                                                      tz->trips.passive.tsp*100,
 901                                                      tz->polling_frequency*100);
 902         else
 903                 tz->thermal_zone =
 904                         thermal_zone_device_register("acpitz", trips, 0, tz,
 905                                                 &acpi_thermal_zone_ops, NULL,
 906                                                 0, tz->polling_frequency*100);
 907         if (IS_ERR(tz->thermal_zone))
 908                 return -ENODEV;
 909
 910         result = sysfs_create_link(&tz->device->dev.kobj,
 911                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 912         if (result)
 913                 return result;
 914
 915         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 916                                    &tz->device->dev.kobj, "device");
 917         if (result)
 918                 return result;
 919
 920         status = acpi_attach_data(tz->device->handle,
 921                                   acpi_bus_private_data_handler,
 922                                   tz->thermal_zone);
 923         if (ACPI_FAILURE(status)) {
 924                 pr_err(PREFIX "Error attaching device data\n");
 925                 return -ENODEV;
 926         }
 927
 928         tz->tz_enabled = 1;
 929
 930         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 931                  tz->thermal_zone->id);
 932         return 0;
 933 }
 934
 935 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 936 {
 937         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 938         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 939         thermal_zone_device_unregister(tz->thermal_zone);
 940         tz->thermal_zone = NULL;
 941         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 942 }
 943
 944
 945 /* --------------------------------------------------------------------------
 946                                  Driver Interface
 947    -------------------------------------------------------------------------- */
 948
 949 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 950 {
 951         struct acpi_thermal *tz = acpi_driver_data(device);
 952
 953
 954         if (!tz)
 955                 return;
 956
 957         switch (event) {
 958         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 959                 acpi_thermal_check(tz);
 960                 break;
 961         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 962                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 963                 acpi_thermal_check(tz);
 964                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 965                                                   dev_name(&device->dev), event, 0);
 966                 break;
 967         case ACPI_THERMAL_NOTIFY_DEVICES:
 968                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 969                 acpi_thermal_check(tz);
 970                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 971                                                   dev_name(&device->dev), event, 0);
 972                 break;
 973         default:
 974                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 975                                   "Unsupported event [0x%x]\n", event));
 976                 break;
 977         }
 978 }
 979
 980 /*
 981  * On some platforms, the AML code has dependency about
 982  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 983  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 984  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 985  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 986  *    if _TMP has never been evaluated.
 987  *
 988  * As this dependency is totally transparent to OS, evaluate
 989  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
 990  * _TMP, before they are actually used.
 991  */
 992 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 993 {
 994         acpi_handle handle = tz->device->handle;
 995         unsigned long long value;
 996         int i;
 997
 998         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
 999         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1000         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1001         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1002                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1003                 acpi_status status;
1004
1005                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1006                 if (status == AE_NOT_FOUND)
1007                         break;
1008         }
1009         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1010 }
1011
1012 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1013 {
1014         int result = 0;
1015
1016
1017         if (!tz)
1018                 return -EINVAL;
1019
1020         acpi_thermal_aml_dependency_fix(tz);
1021
1022         /* Get trip points [_CRT, _PSV, etc.] (required) */
1023         result = acpi_thermal_get_trip_points(tz);
1024         if (result)
1025                 return result;
1026
1027         /* Get temperature [_TMP] (required) */
1028         result = acpi_thermal_get_temperature(tz);
1029         if (result)
1030                 return result;
1031
1032         /* Set the cooling mode [_SCP] to active cooling (default) */
1033         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1034         if (!result)
1035                 tz->flags.cooling_mode = 1;
1036
1037         /* Get default polling frequency [_TZP] (optional) */
1038         if (tzp)
1039                 tz->polling_frequency = tzp;
1040         else
1041                 acpi_thermal_get_polling_frequency(tz);
1042
1043         return 0;
1044 }
1045
1046 /*
1047  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1048  * handles temperature values with a single decimal place. As a consequence,
1049  * some implementations use an offset of 273.1 and others use an offset of
1050  * 273.2. Try to find out which one is being used, to present the most
1051  * accurate and visually appealing number.
1052  *
1053  * The heuristic below should work for all ACPI thermal zones which have a
1054  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1055  */
1056 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1057 {
1058         if (tz->trips.critical.flags.valid &&
1059             (tz->trips.critical.temperature % 5) == 1)
1060                 tz->kelvin_offset = 2731;
1061         else
1062                 tz->kelvin_offset = 2732;
1063 }
1064
1065 static int acpi_thermal_add(struct acpi_device *device)
1066 {
1067         int result = 0;
1068         struct acpi_thermal *tz = NULL;
1069
1070
1071         if (!device)
1072                 return -EINVAL;
1073
1074         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1075         if (!tz)
1076                 return -ENOMEM;
1077
1078         tz->device = device;
1079         strcpy(tz->name, device->pnp.bus_id);
1080         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1081         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1082         device->driver_data = tz;
1083
1084         result = acpi_thermal_get_info(tz);
1085         if (result)
1086                 goto free_memory;
1087
1088         acpi_thermal_guess_offset(tz);
1089
1090         result = acpi_thermal_register_thermal_zone(tz);
1091         if (result)
1092                 goto free_memory;
1093
1094         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1095                 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1096         goto end;
1097
1098 free_memory:
1099         kfree(tz);
1100 end:
1101         return result;
1102 }
1103
1104 static int acpi_thermal_remove(struct acpi_device *device)
1105 {
1106         struct acpi_thermal *tz = NULL;
1107
1108         if (!device || !acpi_driver_data(device))
1109                 return -EINVAL;
1110
1111         tz = acpi_driver_data(device);
1112
1113         acpi_thermal_unregister_thermal_zone(tz);
1114         kfree(tz);
1115         return 0;
1116 }
1117
1118 #ifdef CONFIG_PM_SLEEP
1119 static int acpi_thermal_resume(struct device *dev)
1120 {
1121         struct acpi_thermal *tz;
1122         int i, j, power_state, result;
1123
1124         if (!dev)
1125                 return -EINVAL;
1126
1127         tz = acpi_driver_data(to_acpi_device(dev));
1128         if (!tz)
1129                 return -EINVAL;
1130
1131         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1132                 if (!(&tz->trips.active[i]))
1133                         break;
1134                 if (!tz->trips.active[i].flags.valid)
1135                         break;
1136                 tz->trips.active[i].flags.enabled = 1;
1137                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1138                         result = acpi_bus_update_power(
1139                                         tz->trips.active[i].devices.handles[j],
1140                                         &power_state);
1141                         if (result || (power_state != ACPI_STATE_D0)) {
1142                                 tz->trips.active[i].flags.enabled = 0;
1143                                 break;
1144                         }
1145                 }
1146                 tz->state.active |= tz->trips.active[i].flags.enabled;
1147         }
1148
1149         acpi_thermal_check(tz);
1150
1151         return AE_OK;
1152 }
1153 #endif
1154
1155 static int thermal_act(const struct dmi_system_id *d) {
1156
1157         if (act == 0) {
1158                 pr_notice(PREFIX "%s detected: "
1159                           "disabling all active thermal trip points\n", d->ident);
1160                 act = -1;
1161         }
1162         return 0;
1163 }
1164 static int thermal_nocrt(const struct dmi_system_id *d) {
1165
1166         pr_notice(PREFIX "%s detected: "
1167                   "disabling all critical thermal trip point actions.\n", d->ident);
1168         nocrt = 1;
1169         return 0;
1170 }
1171 static int thermal_tzp(const struct dmi_system_id *d) {
1172
1173         if (tzp == 0) {
1174                 pr_notice(PREFIX "%s detected: "
1175                           "enabling thermal zone polling\n", d->ident);
1176                 tzp = 300;      /* 300 dS = 30 Seconds */
1177         }
1178         return 0;
1179 }
1180 static int thermal_psv(const struct dmi_system_id *d) {
1181
1182         if (psv == 0) {
1183                 pr_notice(PREFIX "%s detected: "
1184                           "disabling all passive thermal trip points\n", d->ident);
1185                 psv = -1;
1186         }
1187         return 0;
1188 }
1189
1190 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1191         /*
1192          * Award BIOS on this AOpen makes thermal control almost worthless.
1193          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1194          */
1195         {
1196          .callback = thermal_act,
1197          .ident = "AOpen i915GMm-HFS",
1198          .matches = {
1199                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1200                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1201                 },
1202         },
1203         {
1204          .callback = thermal_psv,
1205          .ident = "AOpen i915GMm-HFS",
1206          .matches = {
1207                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1208                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1209                 },
1210         },
1211         {
1212          .callback = thermal_tzp,
1213          .ident = "AOpen i915GMm-HFS",
1214          .matches = {
1215                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1216                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1217                 },
1218         },
1219         {
1220          .callback = thermal_nocrt,
1221          .ident = "Gigabyte GA-7ZX",
1222          .matches = {
1223                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1224                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1225                 },
1226         },
1227         {}
1228 };
1229
1230 static int __init acpi_thermal_init(void)
1231 {
1232         int result = 0;
1233
1234         dmi_check_system(thermal_dmi_table);
1235
1236         if (off) {
1237                 pr_notice(PREFIX "thermal control disabled\n");
1238                 return -ENODEV;
1239         }
1240
1241         result = acpi_bus_register_driver(&acpi_thermal_driver);
1242         if (result < 0)
1243                 return -ENODEV;
1244
1245         return 0;
1246 }
1247
1248 static void __exit acpi_thermal_exit(void)
1249 {
1250
1251         acpi_bus_unregister_driver(&acpi_thermal_driver);
1252
1253         return;
1254 }
1255
1256 module_init(acpi_thermal_init);
1257 module_exit(acpi_thermal_exit);