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 <asm/uaccess.h>
  45 #include <linux/thermal.h>
  46 #include <acpi/acpi_bus.h>
  47 #include <acpi/acpi_drivers.h>
  48
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  54 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  55 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  56 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  57 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  58 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  59
  60 #define ACPI_THERMAL_MAX_ACTIVE 10
  61 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  62
  63 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  64 ACPI_MODULE_NAME("thermal");
  65
  66 MODULE_AUTHOR("Paul Diefenbaugh");
  67 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  68 MODULE_LICENSE("GPL");
  69
  70 static int act;
  71 module_param(act, int, 0644);
  72 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  73
  74 static int crt;
  75 module_param(crt, int, 0644);
  76 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  77
  78 static int tzp;
  79 module_param(tzp, int, 0444);
  80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  81
  82 static int nocrt;
  83 module_param(nocrt, int, 0);
  84 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  85
  86 static int off;
  87 module_param(off, int, 0);
  88 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  89
  90 static int psv;
  91 module_param(psv, int, 0644);
  92 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  93
  94 static int acpi_thermal_add(struct acpi_device *device);
  95 static int acpi_thermal_remove(struct acpi_device *device);
  96 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
  97
  98 static const struct acpi_device_id  thermal_device_ids[] = {
  99         {ACPI_THERMAL_HID, 0},
 100         {"", 0},
 101 };
 102 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 103
 104 #ifdef CONFIG_PM_SLEEP
 105 static int acpi_thermal_resume(struct device *dev);
 106 #endif
 107 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
 108
 109 static struct acpi_driver acpi_thermal_driver = {
 110         .name = "thermal",
 111         .class = ACPI_THERMAL_CLASS,
 112         .ids = thermal_device_ids,
 113         .ops = {
 114                 .add = acpi_thermal_add,
 115                 .remove = acpi_thermal_remove,
 116                 .notify = acpi_thermal_notify,
 117                 },
 118         .drv.pm = &acpi_thermal_pm,
 119 };
 120
 121 struct acpi_thermal_state {
 122         u8 critical:1;
 123         u8 hot:1;
 124         u8 passive:1;
 125         u8 active:1;
 126         u8 reserved:4;
 127         int active_index;
 128 };
 129
 130 struct acpi_thermal_state_flags {
 131         u8 valid:1;
 132         u8 enabled:1;
 133         u8 reserved:6;
 134 };
 135
 136 struct acpi_thermal_critical {
 137         struct acpi_thermal_state_flags flags;
 138         unsigned long temperature;
 139 };
 140
 141 struct acpi_thermal_hot {
 142         struct acpi_thermal_state_flags flags;
 143         unsigned long temperature;
 144 };
 145
 146 struct acpi_thermal_passive {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149         unsigned long tc1;
 150         unsigned long tc2;
 151         unsigned long tsp;
 152         struct acpi_handle_list devices;
 153 };
 154
 155 struct acpi_thermal_active {
 156         struct acpi_thermal_state_flags flags;
 157         unsigned long temperature;
 158         struct acpi_handle_list devices;
 159 };
 160
 161 struct acpi_thermal_trips {
 162         struct acpi_thermal_critical critical;
 163         struct acpi_thermal_hot hot;
 164         struct acpi_thermal_passive passive;
 165         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 166 };
 167
 168 struct acpi_thermal_flags {
 169         u8 cooling_mode:1;      /* _SCP */
 170         u8 devices:1;           /* _TZD */
 171         u8 reserved:6;
 172 };
 173
 174 struct acpi_thermal {
 175         struct acpi_device * device;
 176         acpi_bus_id name;
 177         unsigned long temperature;
 178         unsigned long last_temperature;
 179         unsigned long polling_frequency;
 180         volatile u8 zombie;
 181         struct acpi_thermal_flags flags;
 182         struct acpi_thermal_state state;
 183         struct acpi_thermal_trips trips;
 184         struct acpi_handle_list devices;
 185         struct thermal_zone_device *thermal_zone;
 186         int tz_enabled;
 187         int kelvin_offset;
 188 };
 189
 190 /* --------------------------------------------------------------------------
 191                              Thermal Zone Management
 192    -------------------------------------------------------------------------- */
 193
 194 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 195 {
 196         acpi_status status = AE_OK;
 197         unsigned long long tmp;
 198
 199         if (!tz)
 200                 return -EINVAL;
 201
 202         tz->last_temperature = tz->temperature;
 203
 204         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 205         if (ACPI_FAILURE(status))
 206                 return -ENODEV;
 207
 208         tz->temperature = tmp;
 209         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 210                           tz->temperature));
 211
 212         return 0;
 213 }
 214
 215 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 216 {
 217         acpi_status status = AE_OK;
 218         unsigned long long tmp;
 219
 220         if (!tz)
 221                 return -EINVAL;
 222
 223         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 224         if (ACPI_FAILURE(status))
 225                 return -ENODEV;
 226
 227         tz->polling_frequency = tmp;
 228         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 229                           tz->polling_frequency));
 230
 231         return 0;
 232 }
 233
 234 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 235 {
 236         if (!tz)
 237                 return -EINVAL;
 238
 239         if (!acpi_has_method(tz->device->handle, "_SCP")) {
 240                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 241                 return -ENODEV;
 242         } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
 243                                                            "_SCP", mode))) {
 244                 return -ENODEV;
 245         }
 246
 247         return 0;
 248 }
 249
 250 #define ACPI_TRIPS_CRITICAL     0x01
 251 #define ACPI_TRIPS_HOT          0x02
 252 #define ACPI_TRIPS_PASSIVE      0x04
 253 #define ACPI_TRIPS_ACTIVE       0x08
 254 #define ACPI_TRIPS_DEVICES      0x10
 255
 256 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 257 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 258
 259 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 260                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 261                               ACPI_TRIPS_DEVICES)
 262
 263 /*
 264  * This exception is thrown out in two cases:
 265  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 266  *   when re-evaluating the AML code.
 267  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 268  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 269  */
 270 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 271 do {    \
 272         if (flags != ACPI_TRIPS_INIT)   \
 273                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 274                 "ACPI thermal trip point %s changed\n"  \
 275                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 276 } while (0)
 277
 278 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 279 {
 280         acpi_status status = AE_OK;
 281         unsigned long long tmp;
 282         struct acpi_handle_list devices;
 283         int valid = 0;
 284         int i;
 285
 286         /* Critical Shutdown */
 287         if (flag & ACPI_TRIPS_CRITICAL) {
 288                 status = acpi_evaluate_integer(tz->device->handle,
 289                                 "_CRT", NULL, &tmp);
 290                 tz->trips.critical.temperature = tmp;
 291                 /*
 292                  * Treat freezing temperatures as invalid as well; some
 293                  * BIOSes return really low values and cause reboots at startup.
 294                  * Below zero (Celsius) values clearly aren't right for sure..
 295                  * ... so lets discard those as invalid.
 296                  */
 297                 if (ACPI_FAILURE(status)) {
 298                         tz->trips.critical.flags.valid = 0;
 299                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 300                                           "No critical threshold\n"));
 301                 } else if (tmp <= 2732) {
 302                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 303                                "(%llu)\n", tmp);
 304                         tz->trips.critical.flags.valid = 0;
 305                 } else {
 306                         tz->trips.critical.flags.valid = 1;
 307                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 308                                           "Found critical threshold [%lu]\n",
 309                                           tz->trips.critical.temperature));
 310                 }
 311                 if (tz->trips.critical.flags.valid == 1) {
 312                         if (crt == -1) {
 313                                 tz->trips.critical.flags.valid = 0;
 314                         } else if (crt > 0) {
 315                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 316                                 /*
 317                                  * Allow override critical threshold
 318                                  */
 319                                 if (crt_k > tz->trips.critical.temperature)
 320                                         printk(KERN_WARNING PREFIX
 321                                                 "Critical threshold %d C\n", crt);
 322                                 tz->trips.critical.temperature = crt_k;
 323                         }
 324                 }
 325         }
 326
 327         /* Critical Sleep (optional) */
 328         if (flag & ACPI_TRIPS_HOT) {
 329                 status = acpi_evaluate_integer(tz->device->handle,
 330                                 "_HOT", NULL, &tmp);
 331                 if (ACPI_FAILURE(status)) {
 332                         tz->trips.hot.flags.valid = 0;
 333                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 334                                         "No hot threshold\n"));
 335                 } else {
 336                         tz->trips.hot.temperature = tmp;
 337                         tz->trips.hot.flags.valid = 1;
 338                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 339                                         "Found hot threshold [%lu]\n",
 340                                         tz->trips.critical.temperature));
 341                 }
 342         }
 343
 344         /* Passive (optional) */
 345         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 346                 (flag == ACPI_TRIPS_INIT)) {
 347                 valid = tz->trips.passive.flags.valid;
 348                 if (psv == -1) {
 349                         status = AE_SUPPORT;
 350                 } else if (psv > 0) {
 351                         tmp = CELSIUS_TO_KELVIN(psv);
 352                         status = AE_OK;
 353                 } else {
 354                         status = acpi_evaluate_integer(tz->device->handle,
 355                                 "_PSV", NULL, &tmp);
 356                 }
 357
 358                 if (ACPI_FAILURE(status))
 359                         tz->trips.passive.flags.valid = 0;
 360                 else {
 361                         tz->trips.passive.temperature = tmp;
 362                         tz->trips.passive.flags.valid = 1;
 363                         if (flag == ACPI_TRIPS_INIT) {
 364                                 status = acpi_evaluate_integer(
 365                                                 tz->device->handle, "_TC1",
 366                                                 NULL, &tmp);
 367                                 if (ACPI_FAILURE(status))
 368                                         tz->trips.passive.flags.valid = 0;
 369                                 else
 370                                         tz->trips.passive.tc1 = tmp;
 371                                 status = acpi_evaluate_integer(
 372                                                 tz->device->handle, "_TC2",
 373                                                 NULL, &tmp);
 374                                 if (ACPI_FAILURE(status))
 375                                         tz->trips.passive.flags.valid = 0;
 376                                 else
 377                                         tz->trips.passive.tc2 = tmp;
 378                                 status = acpi_evaluate_integer(
 379                                                 tz->device->handle, "_TSP",
 380                                                 NULL, &tmp);
 381                                 if (ACPI_FAILURE(status))
 382                                         tz->trips.passive.flags.valid = 0;
 383                                 else
 384                                         tz->trips.passive.tsp = tmp;
 385                         }
 386                 }
 387         }
 388         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 389                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 390                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 391                                                         NULL, &devices);
 392                 if (ACPI_FAILURE(status)) {
 393                         printk(KERN_WARNING PREFIX
 394                                 "Invalid passive threshold\n");
 395                         tz->trips.passive.flags.valid = 0;
 396                 }
 397                 else
 398                         tz->trips.passive.flags.valid = 1;
 399
 400                 if (memcmp(&tz->trips.passive.devices, &devices,
 401                                 sizeof(struct acpi_handle_list))) {
 402                         memcpy(&tz->trips.passive.devices, &devices,
 403                                 sizeof(struct acpi_handle_list));
 404                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 405                 }
 406         }
 407         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 408                 if (valid != tz->trips.passive.flags.valid)
 409                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 410         }
 411
 412         /* Active (optional) */
 413         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 414                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 415                 valid = tz->trips.active[i].flags.valid;
 416
 417                 if (act == -1)
 418                         break; /* disable all active trip points */
 419
 420                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 421                         tz->trips.active[i].flags.valid)) {
 422                         status = acpi_evaluate_integer(tz->device->handle,
 423                                                         name, NULL, &tmp);
 424                         if (ACPI_FAILURE(status)) {
 425                                 tz->trips.active[i].flags.valid = 0;
 426                                 if (i == 0)
 427                                         break;
 428                                 if (act <= 0)
 429                                         break;
 430                                 if (i == 1)
 431                                         tz->trips.active[0].temperature =
 432                                                 CELSIUS_TO_KELVIN(act);
 433                                 else
 434                                         /*
 435                                          * Don't allow override higher than
 436                                          * the next higher trip point
 437                                          */
 438                                         tz->trips.active[i - 1].temperature =
 439                                                 (tz->trips.active[i - 2].temperature <
 440                                                 CELSIUS_TO_KELVIN(act) ?
 441                                                 tz->trips.active[i - 2].temperature :
 442                                                 CELSIUS_TO_KELVIN(act));
 443                                 break;
 444                         } else {
 445                                 tz->trips.active[i].temperature = tmp;
 446                                 tz->trips.active[i].flags.valid = 1;
 447                         }
 448                 }
 449
 450                 name[2] = 'L';
 451                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 452                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 453                         status = acpi_evaluate_reference(tz->device->handle,
 454                                                 name, NULL, &devices);
 455                         if (ACPI_FAILURE(status)) {
 456                                 printk(KERN_WARNING PREFIX
 457                                         "Invalid active%d threshold\n", i);
 458                                 tz->trips.active[i].flags.valid = 0;
 459                         }
 460                         else
 461                                 tz->trips.active[i].flags.valid = 1;
 462
 463                         if (memcmp(&tz->trips.active[i].devices, &devices,
 464                                         sizeof(struct acpi_handle_list))) {
 465                                 memcpy(&tz->trips.active[i].devices, &devices,
 466                                         sizeof(struct acpi_handle_list));
 467                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 468                         }
 469                 }
 470                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 471                         if (valid != tz->trips.active[i].flags.valid)
 472                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 473
 474                 if (!tz->trips.active[i].flags.valid)
 475                         break;
 476         }
 477
 478         if ((flag & ACPI_TRIPS_DEVICES)
 479             && acpi_has_method(tz->device->handle, "_TZD")) {
 480                 memset(&devices, 0, sizeof(devices));
 481                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 482                                                 NULL, &devices);
 483                 if (ACPI_SUCCESS(status)
 484                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
 485                         tz->devices = devices;
 486                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 487                 }
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 494 {
 495         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 496
 497         if (ret)
 498                 return ret;
 499
 500         valid = tz->trips.critical.flags.valid |
 501                 tz->trips.hot.flags.valid |
 502                 tz->trips.passive.flags.valid;
 503
 504         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 505                 valid |= tz->trips.active[i].flags.valid;
 506
 507         if (!valid) {
 508                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 509                 return -ENODEV;
 510         }
 511         return 0;
 512 }
 513
 514 static void acpi_thermal_check(void *data)
 515 {
 516         struct acpi_thermal *tz = data;
 517
 518         if (!tz->tz_enabled) {
 519                 pr_warn("thermal zone is disabled \n");
 520                 return;
 521         }
 522         thermal_zone_device_update(tz->thermal_zone);
 523 }
 524
 525 /* sys I/F for generic thermal sysfs support */
 526 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 527
 528 static int thermal_get_temp(struct thermal_zone_device *thermal,
 529                             unsigned long *temp)
 530 {
 531         struct acpi_thermal *tz = thermal->devdata;
 532         int result;
 533
 534         if (!tz)
 535                 return -EINVAL;
 536
 537         result = acpi_thermal_get_temperature(tz);
 538         if (result)
 539                 return result;
 540
 541         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 542         return 0;
 543 }
 544
 545 static int thermal_get_mode(struct thermal_zone_device *thermal,
 546                                 enum thermal_device_mode *mode)
 547 {
 548         struct acpi_thermal *tz = thermal->devdata;
 549
 550         if (!tz)
 551                 return -EINVAL;
 552
 553         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 554                 THERMAL_DEVICE_DISABLED;
 555
 556         return 0;
 557 }
 558
 559 static int thermal_set_mode(struct thermal_zone_device *thermal,
 560                                 enum thermal_device_mode mode)
 561 {
 562         struct acpi_thermal *tz = thermal->devdata;
 563         int enable;
 564
 565         if (!tz)
 566                 return -EINVAL;
 567
 568         /*
 569          * enable/disable thermal management from ACPI thermal driver
 570          */
 571         if (mode == THERMAL_DEVICE_ENABLED)
 572                 enable = 1;
 573         else if (mode == THERMAL_DEVICE_DISABLED)
 574                 enable = 0;
 575         else
 576                 return -EINVAL;
 577
 578         if (enable != tz->tz_enabled) {
 579                 tz->tz_enabled = enable;
 580                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 581                         "%s kernel ACPI thermal control\n",
 582                         tz->tz_enabled ? "Enable" : "Disable"));
 583                 acpi_thermal_check(tz);
 584         }
 585         return 0;
 586 }
 587
 588 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 589                                  int trip, enum thermal_trip_type *type)
 590 {
 591         struct acpi_thermal *tz = thermal->devdata;
 592         int i;
 593
 594         if (!tz || trip < 0)
 595                 return -EINVAL;
 596
 597         if (tz->trips.critical.flags.valid) {
 598                 if (!trip) {
 599                         *type = THERMAL_TRIP_CRITICAL;
 600                         return 0;
 601                 }
 602                 trip--;
 603         }
 604
 605         if (tz->trips.hot.flags.valid) {
 606                 if (!trip) {
 607                         *type = THERMAL_TRIP_HOT;
 608                         return 0;
 609                 }
 610                 trip--;
 611         }
 612
 613         if (tz->trips.passive.flags.valid) {
 614                 if (!trip) {
 615                         *type = THERMAL_TRIP_PASSIVE;
 616                         return 0;
 617                 }
 618                 trip--;
 619         }
 620
 621         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 622                 tz->trips.active[i].flags.valid; i++) {
 623                 if (!trip) {
 624                         *type = THERMAL_TRIP_ACTIVE;
 625                         return 0;
 626                 }
 627                 trip--;
 628         }
 629
 630         return -EINVAL;
 631 }
 632
 633 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 634                                  int trip, unsigned long *temp)
 635 {
 636         struct acpi_thermal *tz = thermal->devdata;
 637         int i;
 638
 639         if (!tz || trip < 0)
 640                 return -EINVAL;
 641
 642         if (tz->trips.critical.flags.valid) {
 643                 if (!trip) {
 644                         *temp = KELVIN_TO_MILLICELSIUS(
 645                                 tz->trips.critical.temperature,
 646                                 tz->kelvin_offset);
 647                         return 0;
 648                 }
 649                 trip--;
 650         }
 651
 652         if (tz->trips.hot.flags.valid) {
 653                 if (!trip) {
 654                         *temp = KELVIN_TO_MILLICELSIUS(
 655                                 tz->trips.hot.temperature,
 656                                 tz->kelvin_offset);
 657                         return 0;
 658                 }
 659                 trip--;
 660         }
 661
 662         if (tz->trips.passive.flags.valid) {
 663                 if (!trip) {
 664                         *temp = KELVIN_TO_MILLICELSIUS(
 665                                 tz->trips.passive.temperature,
 666                                 tz->kelvin_offset);
 667                         return 0;
 668                 }
 669                 trip--;
 670         }
 671
 672         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 673                 tz->trips.active[i].flags.valid; i++) {
 674                 if (!trip) {
 675                         *temp = KELVIN_TO_MILLICELSIUS(
 676                                 tz->trips.active[i].temperature,
 677                                 tz->kelvin_offset);
 678                         return 0;
 679                 }
 680                 trip--;
 681         }
 682
 683         return -EINVAL;
 684 }
 685
 686 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 687                                 unsigned long *temperature) {
 688         struct acpi_thermal *tz = thermal->devdata;
 689
 690         if (tz->trips.critical.flags.valid) {
 691                 *temperature = KELVIN_TO_MILLICELSIUS(
 692                                 tz->trips.critical.temperature,
 693                                 tz->kelvin_offset);
 694                 return 0;
 695         } else
 696                 return -EINVAL;
 697 }
 698
 699 static int thermal_get_trend(struct thermal_zone_device *thermal,
 700                                 int trip, enum thermal_trend *trend)
 701 {
 702         struct acpi_thermal *tz = thermal->devdata;
 703         enum thermal_trip_type type;
 704         int i;
 705
 706         if (thermal_get_trip_type(thermal, trip, &type))
 707                 return -EINVAL;
 708
 709         if (type == THERMAL_TRIP_ACTIVE) {
 710                 unsigned long trip_temp;
 711                 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
 712                                                         tz->kelvin_offset);
 713                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 714                         return -EINVAL;
 715
 716                 if (temp > trip_temp) {
 717                         *trend = THERMAL_TREND_RAISING;
 718                         return 0;
 719                 } else {
 720                         /* Fall back on default trend */
 721                         return -EINVAL;
 722                 }
 723         }
 724
 725         /*
 726          * tz->temperature has already been updated by generic thermal layer,
 727          * before this callback being invoked
 728          */
 729         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 730                 + (tz->trips.passive.tc2
 731                 * (tz->temperature - tz->trips.passive.temperature));
 732
 733         if (i > 0)
 734                 *trend = THERMAL_TREND_RAISING;
 735         else if (i < 0)
 736                 *trend = THERMAL_TREND_DROPPING;
 737         else
 738                 *trend = THERMAL_TREND_STABLE;
 739         return 0;
 740 }
 741
 742
 743 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 744                            enum thermal_trip_type trip_type)
 745 {
 746         u8 type = 0;
 747         struct acpi_thermal *tz = thermal->devdata;
 748
 749         if (trip_type == THERMAL_TRIP_CRITICAL)
 750                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 751         else if (trip_type == THERMAL_TRIP_HOT)
 752                 type = ACPI_THERMAL_NOTIFY_HOT;
 753         else
 754                 return 0;
 755
 756         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 757                                         dev_name(&tz->device->dev), type, 1);
 758
 759         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 760                 return 1;
 761
 762         return 0;
 763 }
 764
 765 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 766                                         struct thermal_cooling_device *cdev,
 767                                         bool bind)
 768 {
 769         struct acpi_device *device = cdev->devdata;
 770         struct acpi_thermal *tz = thermal->devdata;
 771         struct acpi_device *dev;
 772         acpi_status status;
 773         acpi_handle handle;
 774         int i;
 775         int j;
 776         int trip = -1;
 777         int result = 0;
 778
 779         if (tz->trips.critical.flags.valid)
 780                 trip++;
 781
 782         if (tz->trips.hot.flags.valid)
 783                 trip++;
 784
 785         if (tz->trips.passive.flags.valid) {
 786                 trip++;
 787                 for (i = 0; i < tz->trips.passive.devices.count;
 788                     i++) {
 789                         handle = tz->trips.passive.devices.handles[i];
 790                         status = acpi_bus_get_device(handle, &dev);
 791                         if (ACPI_FAILURE(status) || dev != device)
 792                                 continue;
 793                         if (bind)
 794                                 result =
 795                                         thermal_zone_bind_cooling_device
 796                                         (thermal, trip, cdev,
 797                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 798                         else
 799                                 result =
 800                                         thermal_zone_unbind_cooling_device
 801                                         (thermal, trip, cdev);
 802                         if (result)
 803                                 goto failed;
 804                 }
 805         }
 806
 807         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 808                 if (!tz->trips.active[i].flags.valid)
 809                         break;
 810                 trip++;
 811                 for (j = 0;
 812                     j < tz->trips.active[i].devices.count;
 813                     j++) {
 814                         handle = tz->trips.active[i].devices.handles[j];
 815                         status = acpi_bus_get_device(handle, &dev);
 816                         if (ACPI_FAILURE(status) || dev != device)
 817                                 continue;
 818                         if (bind)
 819                                 result = thermal_zone_bind_cooling_device
 820                                         (thermal, trip, cdev,
 821                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 822                         else
 823                                 result = thermal_zone_unbind_cooling_device
 824                                         (thermal, trip, cdev);
 825                         if (result)
 826                                 goto failed;
 827                 }
 828         }
 829
 830         for (i = 0; i < tz->devices.count; i++) {
 831                 handle = tz->devices.handles[i];
 832                 status = acpi_bus_get_device(handle, &dev);
 833                 if (ACPI_SUCCESS(status) && (dev == device)) {
 834                         if (bind)
 835                                 result = thermal_zone_bind_cooling_device
 836                                                 (thermal, THERMAL_TRIPS_NONE,
 837                                                  cdev, THERMAL_NO_LIMIT,
 838                                                  THERMAL_NO_LIMIT);
 839                         else
 840                                 result = thermal_zone_unbind_cooling_device
 841                                                 (thermal, THERMAL_TRIPS_NONE,
 842                                                  cdev);
 843                         if (result)
 844                                 goto failed;
 845                 }
 846         }
 847
 848 failed:
 849         return result;
 850 }
 851
 852 static int
 853 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 854                                         struct thermal_cooling_device *cdev)
 855 {
 856         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 857 }
 858
 859 static int
 860 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 861                                         struct thermal_cooling_device *cdev)
 862 {
 863         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 864 }
 865
 866 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 867         .bind = acpi_thermal_bind_cooling_device,
 868         .unbind = acpi_thermal_unbind_cooling_device,
 869         .get_temp = thermal_get_temp,
 870         .get_mode = thermal_get_mode,
 871         .set_mode = thermal_set_mode,
 872         .get_trip_type = thermal_get_trip_type,
 873         .get_trip_temp = thermal_get_trip_temp,
 874         .get_crit_temp = thermal_get_crit_temp,
 875         .get_trend = thermal_get_trend,
 876         .notify = thermal_notify,
 877 };
 878
 879 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 880 {
 881         int trips = 0;
 882         int result;
 883         acpi_status status;
 884         int i;
 885
 886         if (tz->trips.critical.flags.valid)
 887                 trips++;
 888
 889         if (tz->trips.hot.flags.valid)
 890                 trips++;
 891
 892         if (tz->trips.passive.flags.valid)
 893                 trips++;
 894
 895         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 896                         tz->trips.active[i].flags.valid; i++, trips++);
 897
 898         if (tz->trips.passive.flags.valid)
 899                 tz->thermal_zone =
 900                         thermal_zone_device_register("acpitz", trips, 0, tz,
 901                                                 &acpi_thermal_zone_ops, NULL,
 902                                                      tz->trips.passive.tsp*100,
 903                                                      tz->polling_frequency*100);
 904         else
 905                 tz->thermal_zone =
 906                         thermal_zone_device_register("acpitz", trips, 0, tz,
 907                                                 &acpi_thermal_zone_ops, NULL,
 908                                                 0, tz->polling_frequency*100);
 909         if (IS_ERR(tz->thermal_zone))
 910                 return -ENODEV;
 911
 912         result = sysfs_create_link(&tz->device->dev.kobj,
 913                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 914         if (result)
 915                 return result;
 916
 917         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 918                                    &tz->device->dev.kobj, "device");
 919         if (result)
 920                 return result;
 921
 922         status = acpi_attach_data(tz->device->handle,
 923                                   acpi_bus_private_data_handler,
 924                                   tz->thermal_zone);
 925         if (ACPI_FAILURE(status)) {
 926                 printk(KERN_ERR PREFIX
 927                                 "Error attaching device data\n");
 928                 return -ENODEV;
 929         }
 930
 931         tz->tz_enabled = 1;
 932
 933         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 934                  tz->thermal_zone->id);
 935         return 0;
 936 }
 937
 938 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 939 {
 940         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 941         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 942         thermal_zone_device_unregister(tz->thermal_zone);
 943         tz->thermal_zone = NULL;
 944         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 945 }
 946
 947
 948 /* --------------------------------------------------------------------------
 949                                  Driver Interface
 950    -------------------------------------------------------------------------- */
 951
 952 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 953 {
 954         struct acpi_thermal *tz = acpi_driver_data(device);
 955
 956
 957         if (!tz)
 958                 return;
 959
 960         switch (event) {
 961         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 962                 acpi_thermal_check(tz);
 963                 break;
 964         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 965                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 966                 acpi_thermal_check(tz);
 967                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 968                                                   dev_name(&device->dev), event, 0);
 969                 break;
 970         case ACPI_THERMAL_NOTIFY_DEVICES:
 971                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 972                 acpi_thermal_check(tz);
 973                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 974                                                   dev_name(&device->dev), event, 0);
 975                 break;
 976         default:
 977                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 978                                   "Unsupported event [0x%x]\n", event));
 979                 break;
 980         }
 981 }
 982
 983 /*
 984  * On some platforms, the AML code has dependency about
 985  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
 986  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
 987  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
 988  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
 989  *    if _TMP has never been evaluated.
 990  *
 991  * As this dependency is totally transparent to OS, evaluate
 992  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
 993  * _TMP, before they are actually used.
 994  */
 995 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 996 {
 997         acpi_handle handle = tz->device->handle;
 998         unsigned long long value;
 999         int i;
1000
1001         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1002         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1003         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1004         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1005                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1006                 acpi_status status;
1007
1008                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1009                 if (status == AE_NOT_FOUND)
1010                         break;
1011         }
1012         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1013 }
1014
1015 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1016 {
1017         int result = 0;
1018
1019
1020         if (!tz)
1021                 return -EINVAL;
1022
1023         acpi_thermal_aml_dependency_fix(tz);
1024
1025         /* Get trip points [_CRT, _PSV, etc.] (required) */
1026         result = acpi_thermal_get_trip_points(tz);
1027         if (result)
1028                 return result;
1029
1030         /* Get temperature [_TMP] (required) */
1031         result = acpi_thermal_get_temperature(tz);
1032         if (result)
1033                 return result;
1034
1035         /* Set the cooling mode [_SCP] to active cooling (default) */
1036         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1037         if (!result)
1038                 tz->flags.cooling_mode = 1;
1039
1040         /* Get default polling frequency [_TZP] (optional) */
1041         if (tzp)
1042                 tz->polling_frequency = tzp;
1043         else
1044                 acpi_thermal_get_polling_frequency(tz);
1045
1046         return 0;
1047 }
1048
1049 /*
1050  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1051  * handles temperature values with a single decimal place. As a consequence,
1052  * some implementations use an offset of 273.1 and others use an offset of
1053  * 273.2. Try to find out which one is being used, to present the most
1054  * accurate and visually appealing number.
1055  *
1056  * The heuristic below should work for all ACPI thermal zones which have a
1057  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1058  */
1059 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1060 {
1061         if (tz->trips.critical.flags.valid &&
1062             (tz->trips.critical.temperature % 5) == 1)
1063                 tz->kelvin_offset = 2731;
1064         else
1065                 tz->kelvin_offset = 2732;
1066 }
1067
1068 static int acpi_thermal_add(struct acpi_device *device)
1069 {
1070         int result = 0;
1071         struct acpi_thermal *tz = NULL;
1072
1073
1074         if (!device)
1075                 return -EINVAL;
1076
1077         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1078         if (!tz)
1079                 return -ENOMEM;
1080
1081         tz->device = device;
1082         strcpy(tz->name, device->pnp.bus_id);
1083         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1084         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1085         device->driver_data = tz;
1086
1087         result = acpi_thermal_get_info(tz);
1088         if (result)
1089                 goto free_memory;
1090
1091         acpi_thermal_guess_offset(tz);
1092
1093         result = acpi_thermal_register_thermal_zone(tz);
1094         if (result)
1095                 goto free_memory;
1096
1097         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1098                acpi_device_name(device), acpi_device_bid(device),
1099                KELVIN_TO_CELSIUS(tz->temperature));
1100         goto end;
1101
1102 free_memory:
1103         kfree(tz);
1104 end:
1105         return result;
1106 }
1107
1108 static int acpi_thermal_remove(struct acpi_device *device)
1109 {
1110         struct acpi_thermal *tz = NULL;
1111
1112         if (!device || !acpi_driver_data(device))
1113                 return -EINVAL;
1114
1115         tz = acpi_driver_data(device);
1116
1117         acpi_thermal_unregister_thermal_zone(tz);
1118         kfree(tz);
1119         return 0;
1120 }
1121
1122 #ifdef CONFIG_PM_SLEEP
1123 static int acpi_thermal_resume(struct device *dev)
1124 {
1125         struct acpi_thermal *tz;
1126         int i, j, power_state, result;
1127
1128         if (!dev)
1129                 return -EINVAL;
1130
1131         tz = acpi_driver_data(to_acpi_device(dev));
1132         if (!tz)
1133                 return -EINVAL;
1134
1135         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1136                 if (!(&tz->trips.active[i]))
1137                         break;
1138                 if (!tz->trips.active[i].flags.valid)
1139                         break;
1140                 tz->trips.active[i].flags.enabled = 1;
1141                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1142                         result = acpi_bus_update_power(
1143                                         tz->trips.active[i].devices.handles[j],
1144                                         &power_state);
1145                         if (result || (power_state != ACPI_STATE_D0)) {
1146                                 tz->trips.active[i].flags.enabled = 0;
1147                                 break;
1148                         }
1149                 }
1150                 tz->state.active |= tz->trips.active[i].flags.enabled;
1151         }
1152
1153         acpi_thermal_check(tz);
1154
1155         return AE_OK;
1156 }
1157 #endif
1158
1159 static int thermal_act(const struct dmi_system_id *d) {
1160
1161         if (act == 0) {
1162                 printk(KERN_NOTICE "ACPI: %s detected: "
1163                         "disabling all active thermal trip points\n", d->ident);
1164                 act = -1;
1165         }
1166         return 0;
1167 }
1168 static int thermal_nocrt(const struct dmi_system_id *d) {
1169
1170         printk(KERN_NOTICE "ACPI: %s detected: "
1171                 "disabling all critical thermal trip point actions.\n", d->ident);
1172         nocrt = 1;
1173         return 0;
1174 }
1175 static int thermal_tzp(const struct dmi_system_id *d) {
1176
1177         if (tzp == 0) {
1178                 printk(KERN_NOTICE "ACPI: %s detected: "
1179                         "enabling thermal zone polling\n", d->ident);
1180                 tzp = 300;      /* 300 dS = 30 Seconds */
1181         }
1182         return 0;
1183 }
1184 static int thermal_psv(const struct dmi_system_id *d) {
1185
1186         if (psv == 0) {
1187                 printk(KERN_NOTICE "ACPI: %s detected: "
1188                         "disabling all passive thermal trip points\n", d->ident);
1189                 psv = -1;
1190         }
1191         return 0;
1192 }
1193
1194 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1195         /*
1196          * Award BIOS on this AOpen makes thermal control almost worthless.
1197          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1198          */
1199         {
1200          .callback = thermal_act,
1201          .ident = "AOpen i915GMm-HFS",
1202          .matches = {
1203                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1204                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1205                 },
1206         },
1207         {
1208          .callback = thermal_psv,
1209          .ident = "AOpen i915GMm-HFS",
1210          .matches = {
1211                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1212                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1213                 },
1214         },
1215         {
1216          .callback = thermal_tzp,
1217          .ident = "AOpen i915GMm-HFS",
1218          .matches = {
1219                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1220                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1221                 },
1222         },
1223         {
1224          .callback = thermal_nocrt,
1225          .ident = "Gigabyte GA-7ZX",
1226          .matches = {
1227                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1228                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1229                 },
1230         },
1231         {}
1232 };
1233
1234 static int __init acpi_thermal_init(void)
1235 {
1236         int result = 0;
1237
1238         dmi_check_system(thermal_dmi_table);
1239
1240         if (off) {
1241                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1242                 return -ENODEV;
1243         }
1244
1245         result = acpi_bus_register_driver(&acpi_thermal_driver);
1246         if (result < 0)
1247                 return -ENODEV;
1248
1249         return 0;
1250 }
1251
1252 static void __exit acpi_thermal_exit(void)
1253 {
1254
1255         acpi_bus_unregister_driver(&acpi_thermal_driver);
1256
1257         return;
1258 }
1259
1260 module_init(acpi_thermal_init);
1261 module_exit(acpi_thermal_exit);