linux/drivers/acpi/thermal.c
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   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_FILE_STATE         "state"
  54#define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55#define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56#define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57#define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59#define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60#define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61#define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62#define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63#define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65#define ACPI_THERMAL_MAX_ACTIVE 10
  66#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68#define _COMPONENT              ACPI_THERMAL_COMPONENT
  69ACPI_MODULE_NAME("thermal");
  70
  71MODULE_AUTHOR("Paul Diefenbaugh");
  72MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  73MODULE_LICENSE("GPL");
  74
  75static int act;
  76module_param(act, int, 0644);
  77MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  78
  79static int crt;
  80module_param(crt, int, 0644);
  81MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  82
  83static int tzp;
  84module_param(tzp, int, 0444);
  85MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  86
  87static int nocrt;
  88module_param(nocrt, int, 0);
  89MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  90
  91static int off;
  92module_param(off, int, 0);
  93MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  94
  95static int psv;
  96module_param(psv, int, 0644);
  97MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  98
  99static int acpi_thermal_add(struct acpi_device *device);
 100static int acpi_thermal_remove(struct acpi_device *device);
 101static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 102
 103static const struct acpi_device_id  thermal_device_ids[] = {
 104        {ACPI_THERMAL_HID, 0},
 105        {"", 0},
 106};
 107MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 108
 109#ifdef CONFIG_PM_SLEEP
 110static int acpi_thermal_resume(struct device *dev);
 111#endif
 112static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
 113
 114static struct acpi_driver acpi_thermal_driver = {
 115        .name = "thermal",
 116        .class = ACPI_THERMAL_CLASS,
 117        .ids = thermal_device_ids,
 118        .ops = {
 119                .add = acpi_thermal_add,
 120                .remove = acpi_thermal_remove,
 121                .notify = acpi_thermal_notify,
 122                },
 123        .drv.pm = &acpi_thermal_pm,
 124};
 125
 126struct acpi_thermal_state {
 127        u8 critical:1;
 128        u8 hot:1;
 129        u8 passive:1;
 130        u8 active:1;
 131        u8 reserved:4;
 132        int active_index;
 133};
 134
 135struct acpi_thermal_state_flags {
 136        u8 valid:1;
 137        u8 enabled:1;
 138        u8 reserved:6;
 139};
 140
 141struct acpi_thermal_critical {
 142        struct acpi_thermal_state_flags flags;
 143        unsigned long temperature;
 144};
 145
 146struct acpi_thermal_hot {
 147        struct acpi_thermal_state_flags flags;
 148        unsigned long temperature;
 149};
 150
 151struct acpi_thermal_passive {
 152        struct acpi_thermal_state_flags flags;
 153        unsigned long temperature;
 154        unsigned long tc1;
 155        unsigned long tc2;
 156        unsigned long tsp;
 157        struct acpi_handle_list devices;
 158};
 159
 160struct acpi_thermal_active {
 161        struct acpi_thermal_state_flags flags;
 162        unsigned long temperature;
 163        struct acpi_handle_list devices;
 164};
 165
 166struct acpi_thermal_trips {
 167        struct acpi_thermal_critical critical;
 168        struct acpi_thermal_hot hot;
 169        struct acpi_thermal_passive passive;
 170        struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 171};
 172
 173struct acpi_thermal_flags {
 174        u8 cooling_mode:1;      /* _SCP */
 175        u8 devices:1;           /* _TZD */
 176        u8 reserved:6;
 177};
 178
 179struct acpi_thermal {
 180        struct acpi_device * device;
 181        acpi_bus_id name;
 182        unsigned long temperature;
 183        unsigned long last_temperature;
 184        unsigned long polling_frequency;
 185        volatile u8 zombie;
 186        struct acpi_thermal_flags flags;
 187        struct acpi_thermal_state state;
 188        struct acpi_thermal_trips trips;
 189        struct acpi_handle_list devices;
 190        struct thermal_zone_device *thermal_zone;
 191        int tz_enabled;
 192        int kelvin_offset;
 193        struct mutex lock;
 194};
 195
 196/* --------------------------------------------------------------------------
 197                             Thermal Zone Management
 198   -------------------------------------------------------------------------- */
 199
 200static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 201{
 202        acpi_status status = AE_OK;
 203        unsigned long long tmp;
 204
 205        if (!tz)
 206                return -EINVAL;
 207
 208        tz->last_temperature = tz->temperature;
 209
 210        status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 211        if (ACPI_FAILURE(status))
 212                return -ENODEV;
 213
 214        tz->temperature = tmp;
 215        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 216                          tz->temperature));
 217
 218        return 0;
 219}
 220
 221static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 222{
 223        acpi_status status = AE_OK;
 224        unsigned long long tmp;
 225
 226        if (!tz)
 227                return -EINVAL;
 228
 229        status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 230        if (ACPI_FAILURE(status))
 231                return -ENODEV;
 232
 233        tz->polling_frequency = tmp;
 234        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 235                          tz->polling_frequency));
 236
 237        return 0;
 238}
 239
 240static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 241{
 242        acpi_status status = AE_OK;
 243        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 244        struct acpi_object_list arg_list = { 1, &arg0 };
 245        acpi_handle handle = NULL;
 246
 247
 248        if (!tz)
 249                return -EINVAL;
 250
 251        status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 252        if (ACPI_FAILURE(status)) {
 253                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 254                return -ENODEV;
 255        }
 256
 257        arg0.integer.value = mode;
 258
 259        status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 260        if (ACPI_FAILURE(status))
 261                return -ENODEV;
 262
 263        return 0;
 264}
 265
 266#define ACPI_TRIPS_CRITICAL     0x01
 267#define ACPI_TRIPS_HOT          0x02
 268#define ACPI_TRIPS_PASSIVE      0x04
 269#define ACPI_TRIPS_ACTIVE       0x08
 270#define ACPI_TRIPS_DEVICES      0x10
 271
 272#define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 273#define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 274
 275#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 276                              ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 277                              ACPI_TRIPS_DEVICES)
 278
 279/*
 280 * This exception is thrown out in two cases:
 281 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 282 *   when re-evaluating the AML code.
 283 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 284 *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 285 */
 286#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 287do {    \
 288        if (flags != ACPI_TRIPS_INIT)   \
 289                ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 290                "ACPI thermal trip point %s changed\n"  \
 291                "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
 292} while (0)
 293
 294static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 295{
 296        acpi_status status = AE_OK;
 297        unsigned long long tmp;
 298        struct acpi_handle_list devices;
 299        int valid = 0;
 300        int i;
 301
 302        /* Critical Shutdown */
 303        if (flag & ACPI_TRIPS_CRITICAL) {
 304                status = acpi_evaluate_integer(tz->device->handle,
 305                                "_CRT", NULL, &tmp);
 306                tz->trips.critical.temperature = tmp;
 307                /*
 308                 * Treat freezing temperatures as invalid as well; some
 309                 * BIOSes return really low values and cause reboots at startup.
 310                 * Below zero (Celsius) values clearly aren't right for sure..
 311                 * ... so lets discard those as invalid.
 312                 */
 313                if (ACPI_FAILURE(status)) {
 314                        tz->trips.critical.flags.valid = 0;
 315                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 316                                          "No critical threshold\n"));
 317                } else if (tmp <= 2732) {
 318                        printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 319                               "(%llu)\n", tmp);
 320                        tz->trips.critical.flags.valid = 0;
 321                } else {
 322                        tz->trips.critical.flags.valid = 1;
 323                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 324                                          "Found critical threshold [%lu]\n",
 325                                          tz->trips.critical.temperature));
 326                }
 327                if (tz->trips.critical.flags.valid == 1) {
 328                        if (crt == -1) {
 329                                tz->trips.critical.flags.valid = 0;
 330                        } else if (crt > 0) {
 331                                unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 332                                /*
 333                                 * Allow override critical threshold
 334                                 */
 335                                if (crt_k > tz->trips.critical.temperature)
 336                                        printk(KERN_WARNING PREFIX
 337                                                "Critical threshold %d C\n", crt);
 338                                tz->trips.critical.temperature = crt_k;
 339                        }
 340                }
 341        }
 342
 343        /* Critical Sleep (optional) */
 344        if (flag & ACPI_TRIPS_HOT) {
 345                status = acpi_evaluate_integer(tz->device->handle,
 346                                "_HOT", NULL, &tmp);
 347                if (ACPI_FAILURE(status)) {
 348                        tz->trips.hot.flags.valid = 0;
 349                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 350                                        "No hot threshold\n"));
 351                } else {
 352                        tz->trips.hot.temperature = tmp;
 353                        tz->trips.hot.flags.valid = 1;
 354                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 355                                        "Found hot threshold [%lu]\n",
 356                                        tz->trips.critical.temperature));
 357                }
 358        }
 359
 360        /* Passive (optional) */
 361        if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 362                (flag == ACPI_TRIPS_INIT)) {
 363                valid = tz->trips.passive.flags.valid;
 364                if (psv == -1) {
 365                        status = AE_SUPPORT;
 366                } else if (psv > 0) {
 367                        tmp = CELSIUS_TO_KELVIN(psv);
 368                        status = AE_OK;
 369                } else {
 370                        status = acpi_evaluate_integer(tz->device->handle,
 371                                "_PSV", NULL, &tmp);
 372                }
 373
 374                if (ACPI_FAILURE(status))
 375                        tz->trips.passive.flags.valid = 0;
 376                else {
 377                        tz->trips.passive.temperature = tmp;
 378                        tz->trips.passive.flags.valid = 1;
 379                        if (flag == ACPI_TRIPS_INIT) {
 380                                status = acpi_evaluate_integer(
 381                                                tz->device->handle, "_TC1",
 382                                                NULL, &tmp);
 383                                if (ACPI_FAILURE(status))
 384                                        tz->trips.passive.flags.valid = 0;
 385                                else
 386                                        tz->trips.passive.tc1 = tmp;
 387                                status = acpi_evaluate_integer(
 388                                                tz->device->handle, "_TC2",
 389                                                NULL, &tmp);
 390                                if (ACPI_FAILURE(status))
 391                                        tz->trips.passive.flags.valid = 0;
 392                                else
 393                                        tz->trips.passive.tc2 = tmp;
 394                                status = acpi_evaluate_integer(
 395                                                tz->device->handle, "_TSP",
 396                                                NULL, &tmp);
 397                                if (ACPI_FAILURE(status))
 398                                        tz->trips.passive.flags.valid = 0;
 399                                else
 400                                        tz->trips.passive.tsp = tmp;
 401                        }
 402                }
 403        }
 404        if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 405                memset(&devices, 0, sizeof(struct acpi_handle_list));
 406                status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 407                                                        NULL, &devices);
 408                if (ACPI_FAILURE(status)) {
 409                        printk(KERN_WARNING PREFIX
 410                                "Invalid passive threshold\n");
 411                        tz->trips.passive.flags.valid = 0;
 412                }
 413                else
 414                        tz->trips.passive.flags.valid = 1;
 415
 416                if (memcmp(&tz->trips.passive.devices, &devices,
 417                                sizeof(struct acpi_handle_list))) {
 418                        memcpy(&tz->trips.passive.devices, &devices,
 419                                sizeof(struct acpi_handle_list));
 420                        ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 421                }
 422        }
 423        if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 424                if (valid != tz->trips.passive.flags.valid)
 425                                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 426        }
 427
 428        /* Active (optional) */
 429        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 430                char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 431                valid = tz->trips.active[i].flags.valid;
 432
 433                if (act == -1)
 434                        break; /* disable all active trip points */
 435
 436                if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 437                        tz->trips.active[i].flags.valid)) {
 438                        status = acpi_evaluate_integer(tz->device->handle,
 439                                                        name, NULL, &tmp);
 440                        if (ACPI_FAILURE(status)) {
 441                                tz->trips.active[i].flags.valid = 0;
 442                                if (i == 0)
 443                                        break;
 444                                if (act <= 0)
 445                                        break;
 446                                if (i == 1)
 447                                        tz->trips.active[0].temperature =
 448                                                CELSIUS_TO_KELVIN(act);
 449                                else
 450                                        /*
 451                                         * Don't allow override higher than
 452                                         * the next higher trip point
 453                                         */
 454                                        tz->trips.active[i - 1].temperature =
 455                                                (tz->trips.active[i - 2].temperature <
 456                                                CELSIUS_TO_KELVIN(act) ?
 457                                                tz->trips.active[i - 2].temperature :
 458                                                CELSIUS_TO_KELVIN(act));
 459                                break;
 460                        } else {
 461                                tz->trips.active[i].temperature = tmp;
 462                                tz->trips.active[i].flags.valid = 1;
 463                        }
 464                }
 465
 466                name[2] = 'L';
 467                if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 468                        memset(&devices, 0, sizeof(struct acpi_handle_list));
 469                        status = acpi_evaluate_reference(tz->device->handle,
 470                                                name, NULL, &devices);
 471                        if (ACPI_FAILURE(status)) {
 472                                printk(KERN_WARNING PREFIX
 473                                        "Invalid active%d threshold\n", i);
 474                                tz->trips.active[i].flags.valid = 0;
 475                        }
 476                        else
 477                                tz->trips.active[i].flags.valid = 1;
 478
 479                        if (memcmp(&tz->trips.active[i].devices, &devices,
 480                                        sizeof(struct acpi_handle_list))) {
 481                                memcpy(&tz->trips.active[i].devices, &devices,
 482                                        sizeof(struct acpi_handle_list));
 483                                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 484                        }
 485                }
 486                if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 487                        if (valid != tz->trips.active[i].flags.valid)
 488                                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 489
 490                if (!tz->trips.active[i].flags.valid)
 491                        break;
 492        }
 493
 494        if (flag & ACPI_TRIPS_DEVICES) {
 495                memset(&devices, 0, sizeof(struct acpi_handle_list));
 496                status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 497                                                NULL, &devices);
 498                if (memcmp(&tz->devices, &devices,
 499                                sizeof(struct acpi_handle_list))) {
 500                        memcpy(&tz->devices, &devices,
 501                                sizeof(struct acpi_handle_list));
 502                        ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 503                }
 504        }
 505
 506        return 0;
 507}
 508
 509static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 510{
 511        int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 512
 513        if (ret)
 514                return ret;
 515
 516        valid = tz->trips.critical.flags.valid |
 517                tz->trips.hot.flags.valid |
 518                tz->trips.passive.flags.valid;
 519
 520        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 521                valid |= tz->trips.active[i].flags.valid;
 522
 523        if (!valid) {
 524                printk(KERN_WARNING FW_BUG "No valid trip found\n");
 525                return -ENODEV;
 526        }
 527        return 0;
 528}
 529
 530static void acpi_thermal_check(void *data)
 531{
 532        struct acpi_thermal *tz = data;
 533
 534        if (!tz->tz_enabled) {
 535                pr_warn("thermal zone is disabled \n");
 536                return;
 537        }
 538        thermal_zone_device_update(tz->thermal_zone);
 539}
 540
 541/* sys I/F for generic thermal sysfs support */
 542#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 543
 544static int thermal_get_temp(struct thermal_zone_device *thermal,
 545                            unsigned long *temp)
 546{
 547        struct acpi_thermal *tz = thermal->devdata;
 548        int result;
 549
 550        if (!tz)
 551                return -EINVAL;
 552
 553        result = acpi_thermal_get_temperature(tz);
 554        if (result)
 555                return result;
 556
 557        *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 558        return 0;
 559}
 560
 561static int thermal_get_mode(struct thermal_zone_device *thermal,
 562                                enum thermal_device_mode *mode)
 563{
 564        struct acpi_thermal *tz = thermal->devdata;
 565
 566        if (!tz)
 567                return -EINVAL;
 568
 569        *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 570                THERMAL_DEVICE_DISABLED;
 571
 572        return 0;
 573}
 574
 575static int thermal_set_mode(struct thermal_zone_device *thermal,
 576                                enum thermal_device_mode mode)
 577{
 578        struct acpi_thermal *tz = thermal->devdata;
 579        int enable;
 580
 581        if (!tz)
 582                return -EINVAL;
 583
 584        /*
 585         * enable/disable thermal management from ACPI thermal driver
 586         */
 587        if (mode == THERMAL_DEVICE_ENABLED)
 588                enable = 1;
 589        else if (mode == THERMAL_DEVICE_DISABLED)
 590                enable = 0;
 591        else
 592                return -EINVAL;
 593
 594        if (enable != tz->tz_enabled) {
 595                tz->tz_enabled = enable;
 596                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 597                        "%s kernel ACPI thermal control\n",
 598                        tz->tz_enabled ? "Enable" : "Disable"));
 599                acpi_thermal_check(tz);
 600        }
 601        return 0;
 602}
 603
 604static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 605                                 int trip, enum thermal_trip_type *type)
 606{
 607        struct acpi_thermal *tz = thermal->devdata;
 608        int i;
 609
 610        if (!tz || trip < 0)
 611                return -EINVAL;
 612
 613        if (tz->trips.critical.flags.valid) {
 614                if (!trip) {
 615                        *type = THERMAL_TRIP_CRITICAL;
 616                        return 0;
 617                }
 618                trip--;
 619        }
 620
 621        if (tz->trips.hot.flags.valid) {
 622                if (!trip) {
 623                        *type = THERMAL_TRIP_HOT;
 624                        return 0;
 625                }
 626                trip--;
 627        }
 628
 629        if (tz->trips.passive.flags.valid) {
 630                if (!trip) {
 631                        *type = THERMAL_TRIP_PASSIVE;
 632                        return 0;
 633                }
 634                trip--;
 635        }
 636
 637        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 638                tz->trips.active[i].flags.valid; i++) {
 639                if (!trip) {
 640                        *type = THERMAL_TRIP_ACTIVE;
 641                        return 0;
 642                }
 643                trip--;
 644        }
 645
 646        return -EINVAL;
 647}
 648
 649static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 650                                 int trip, unsigned long *temp)
 651{
 652        struct acpi_thermal *tz = thermal->devdata;
 653        int i;
 654
 655        if (!tz || trip < 0)
 656                return -EINVAL;
 657
 658        if (tz->trips.critical.flags.valid) {
 659                if (!trip) {
 660                        *temp = KELVIN_TO_MILLICELSIUS(
 661                                tz->trips.critical.temperature,
 662                                tz->kelvin_offset);
 663                        return 0;
 664                }
 665                trip--;
 666        }
 667
 668        if (tz->trips.hot.flags.valid) {
 669                if (!trip) {
 670                        *temp = KELVIN_TO_MILLICELSIUS(
 671                                tz->trips.hot.temperature,
 672                                tz->kelvin_offset);
 673                        return 0;
 674                }
 675                trip--;
 676        }
 677
 678        if (tz->trips.passive.flags.valid) {
 679                if (!trip) {
 680                        *temp = KELVIN_TO_MILLICELSIUS(
 681                                tz->trips.passive.temperature,
 682                                tz->kelvin_offset);
 683                        return 0;
 684                }
 685                trip--;
 686        }
 687
 688        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 689                tz->trips.active[i].flags.valid; i++) {
 690                if (!trip) {
 691                        *temp = KELVIN_TO_MILLICELSIUS(
 692                                tz->trips.active[i].temperature,
 693                                tz->kelvin_offset);
 694                        return 0;
 695                }
 696                trip--;
 697        }
 698
 699        return -EINVAL;
 700}
 701
 702static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 703                                unsigned long *temperature) {
 704        struct acpi_thermal *tz = thermal->devdata;
 705
 706        if (tz->trips.critical.flags.valid) {
 707                *temperature = KELVIN_TO_MILLICELSIUS(
 708                                tz->trips.critical.temperature,
 709                                tz->kelvin_offset);
 710                return 0;
 711        } else
 712                return -EINVAL;
 713}
 714
 715static int thermal_get_trend(struct thermal_zone_device *thermal,
 716                                int trip, enum thermal_trend *trend)
 717{
 718        struct acpi_thermal *tz = thermal->devdata;
 719        enum thermal_trip_type type;
 720        int i;
 721
 722        if (thermal_get_trip_type(thermal, trip, &type))
 723                return -EINVAL;
 724
 725        if (type == THERMAL_TRIP_ACTIVE) {
 726                unsigned long trip_temp;
 727                unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
 728                                                        tz->kelvin_offset);
 729                if (thermal_get_trip_temp(thermal, trip, &trip_temp))
 730                        return -EINVAL;
 731
 732                if (temp > trip_temp) {
 733                        *trend = THERMAL_TREND_RAISING;
 734                        return 0;
 735                } else {
 736                        /* Fall back on default trend */
 737                        return -EINVAL;
 738                }
 739        }
 740
 741        /*
 742         * tz->temperature has already been updated by generic thermal layer,
 743         * before this callback being invoked
 744         */
 745        i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 746                + (tz->trips.passive.tc2
 747                * (tz->temperature - tz->trips.passive.temperature));
 748
 749        if (i > 0)
 750                *trend = THERMAL_TREND_RAISING;
 751        else if (i < 0)
 752                *trend = THERMAL_TREND_DROPPING;
 753        else
 754                *trend = THERMAL_TREND_STABLE;
 755        return 0;
 756}
 757
 758
 759static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 760                           enum thermal_trip_type trip_type)
 761{
 762        u8 type = 0;
 763        struct acpi_thermal *tz = thermal->devdata;
 764
 765        if (trip_type == THERMAL_TRIP_CRITICAL)
 766                type = ACPI_THERMAL_NOTIFY_CRITICAL;
 767        else if (trip_type == THERMAL_TRIP_HOT)
 768                type = ACPI_THERMAL_NOTIFY_HOT;
 769        else
 770                return 0;
 771
 772        acpi_bus_generate_proc_event(tz->device, type, 1);
 773        acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 774                                        dev_name(&tz->device->dev), type, 1);
 775
 776        if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 777                return 1;
 778
 779        return 0;
 780}
 781
 782static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 783                                        struct thermal_cooling_device *cdev,
 784                                        bool bind)
 785{
 786        struct acpi_device *device = cdev->devdata;
 787        struct acpi_thermal *tz = thermal->devdata;
 788        struct acpi_device *dev;
 789        acpi_status status;
 790        acpi_handle handle;
 791        int i;
 792        int j;
 793        int trip = -1;
 794        int result = 0;
 795
 796        if (tz->trips.critical.flags.valid)
 797                trip++;
 798
 799        if (tz->trips.hot.flags.valid)
 800                trip++;
 801
 802        if (tz->trips.passive.flags.valid) {
 803                trip++;
 804                for (i = 0; i < tz->trips.passive.devices.count;
 805                    i++) {
 806                        handle = tz->trips.passive.devices.handles[i];
 807                        status = acpi_bus_get_device(handle, &dev);
 808                        if (ACPI_FAILURE(status) || dev != device)
 809                                continue;
 810                        if (bind)
 811                                result =
 812                                        thermal_zone_bind_cooling_device
 813                                        (thermal, trip, cdev,
 814                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 815                        else
 816                                result =
 817                                        thermal_zone_unbind_cooling_device
 818                                        (thermal, trip, cdev);
 819                        if (result)
 820                                goto failed;
 821                }
 822        }
 823
 824        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 825                if (!tz->trips.active[i].flags.valid)
 826                        break;
 827                trip++;
 828                for (j = 0;
 829                    j < tz->trips.active[i].devices.count;
 830                    j++) {
 831                        handle = tz->trips.active[i].devices.handles[j];
 832                        status = acpi_bus_get_device(handle, &dev);
 833                        if (ACPI_FAILURE(status) || dev != device)
 834                                continue;
 835                        if (bind)
 836                                result = thermal_zone_bind_cooling_device
 837                                        (thermal, trip, cdev,
 838                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 839                        else
 840                                result = thermal_zone_unbind_cooling_device
 841                                        (thermal, trip, cdev);
 842                        if (result)
 843                                goto failed;
 844                }
 845        }
 846
 847        for (i = 0; i < tz->devices.count; i++) {
 848                handle = tz->devices.handles[i];
 849                status = acpi_bus_get_device(handle, &dev);
 850                if (ACPI_SUCCESS(status) && (dev == device)) {
 851                        if (bind)
 852                                result = thermal_zone_bind_cooling_device
 853                                                (thermal, -1, cdev,
 854                                                 THERMAL_NO_LIMIT,
 855                                                 THERMAL_NO_LIMIT);
 856                        else
 857                                result = thermal_zone_unbind_cooling_device
 858                                                (thermal, -1, cdev);
 859                        if (result)
 860                                goto failed;
 861                }
 862        }
 863
 864failed:
 865        return result;
 866}
 867
 868static int
 869acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 870                                        struct thermal_cooling_device *cdev)
 871{
 872        return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 873}
 874
 875static int
 876acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 877                                        struct thermal_cooling_device *cdev)
 878{
 879        return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 880}
 881
 882static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 883        .bind = acpi_thermal_bind_cooling_device,
 884        .unbind = acpi_thermal_unbind_cooling_device,
 885        .get_temp = thermal_get_temp,
 886        .get_mode = thermal_get_mode,
 887        .set_mode = thermal_set_mode,
 888        .get_trip_type = thermal_get_trip_type,
 889        .get_trip_temp = thermal_get_trip_temp,
 890        .get_crit_temp = thermal_get_crit_temp,
 891        .get_trend = thermal_get_trend,
 892        .notify = thermal_notify,
 893};
 894
 895static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 896{
 897        int trips = 0;
 898        int result;
 899        acpi_status status;
 900        int i;
 901
 902        if (tz->trips.critical.flags.valid)
 903                trips++;
 904
 905        if (tz->trips.hot.flags.valid)
 906                trips++;
 907
 908        if (tz->trips.passive.flags.valid)
 909                trips++;
 910
 911        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 912                        tz->trips.active[i].flags.valid; i++, trips++);
 913
 914        if (tz->trips.passive.flags.valid)
 915                tz->thermal_zone =
 916                        thermal_zone_device_register("acpitz", trips, 0, tz,
 917                                                &acpi_thermal_zone_ops, NULL,
 918                                                     tz->trips.passive.tsp*100,
 919                                                     tz->polling_frequency*100);
 920        else
 921                tz->thermal_zone =
 922                        thermal_zone_device_register("acpitz", trips, 0, tz,
 923                                                &acpi_thermal_zone_ops, NULL,
 924                                                0, tz->polling_frequency*100);
 925        if (IS_ERR(tz->thermal_zone))
 926                return -ENODEV;
 927
 928        result = sysfs_create_link(&tz->device->dev.kobj,
 929                                   &tz->thermal_zone->device.kobj, "thermal_zone");
 930        if (result)
 931                return result;
 932
 933        result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 934                                   &tz->device->dev.kobj, "device");
 935        if (result)
 936                return result;
 937
 938        status = acpi_attach_data(tz->device->handle,
 939                                  acpi_bus_private_data_handler,
 940                                  tz->thermal_zone);
 941        if (ACPI_FAILURE(status)) {
 942                printk(KERN_ERR PREFIX
 943                                "Error attaching device data\n");
 944                return -ENODEV;
 945        }
 946
 947        tz->tz_enabled = 1;
 948
 949        dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 950                 tz->thermal_zone->id);
 951        return 0;
 952}
 953
 954static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 955{
 956        sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 957        sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 958        thermal_zone_device_unregister(tz->thermal_zone);
 959        tz->thermal_zone = NULL;
 960        acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 961}
 962
 963
 964/* --------------------------------------------------------------------------
 965                                 Driver Interface
 966   -------------------------------------------------------------------------- */
 967
 968static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 969{
 970        struct acpi_thermal *tz = acpi_driver_data(device);
 971
 972
 973        if (!tz)
 974                return;
 975
 976        switch (event) {
 977        case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 978                acpi_thermal_check(tz);
 979                break;
 980        case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 981                acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 982                acpi_thermal_check(tz);
 983                acpi_bus_generate_proc_event(device, event, 0);
 984                acpi_bus_generate_netlink_event(device->pnp.device_class,
 985                                                  dev_name(&device->dev), event, 0);
 986                break;
 987        case ACPI_THERMAL_NOTIFY_DEVICES:
 988                acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 989                acpi_thermal_check(tz);
 990                acpi_bus_generate_proc_event(device, event, 0);
 991                acpi_bus_generate_netlink_event(device->pnp.device_class,
 992                                                  dev_name(&device->dev), event, 0);
 993                break;
 994        default:
 995                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 996                                  "Unsupported event [0x%x]\n", event));
 997                break;
 998        }
 999}
1000
1001/*
1002 * On some platforms, the AML code has dependency about
1003 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
1004 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
1005 *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
1006 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
1007 *    if _TMP has never been evaluated.
1008 *
1009 * As this dependency is totally transparent to OS, evaluate
1010 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
1011 * _TMP, before they are actually used.
1012 */
1013static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1014{
1015        acpi_handle handle = tz->device->handle;
1016        unsigned long long value;
1017        int i;
1018
1019        acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1020        acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1021        acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1022        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1023                char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1024                acpi_status status;
1025
1026                status = acpi_evaluate_integer(handle, name, NULL, &value);
1027                if (status == AE_NOT_FOUND)
1028                        break;
1029        }
1030        acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1031}
1032
1033static int acpi_thermal_get_info(struct acpi_thermal *tz)
1034{
1035        int result = 0;
1036
1037
1038        if (!tz)
1039                return -EINVAL;
1040
1041        acpi_thermal_aml_dependency_fix(tz);
1042
1043        /* Get trip points [_CRT, _PSV, etc.] (required) */
1044        result = acpi_thermal_get_trip_points(tz);
1045        if (result)
1046                return result;
1047
1048        /* Get temperature [_TMP] (required) */
1049        result = acpi_thermal_get_temperature(tz);
1050        if (result)
1051                return result;
1052
1053        /* Set the cooling mode [_SCP] to active cooling (default) */
1054        result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1055        if (!result)
1056                tz->flags.cooling_mode = 1;
1057
1058        /* Get default polling frequency [_TZP] (optional) */
1059        if (tzp)
1060                tz->polling_frequency = tzp;
1061        else
1062                acpi_thermal_get_polling_frequency(tz);
1063
1064        return 0;
1065}
1066
1067/*
1068 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1069 * handles temperature values with a single decimal place. As a consequence,
1070 * some implementations use an offset of 273.1 and others use an offset of
1071 * 273.2. Try to find out which one is being used, to present the most
1072 * accurate and visually appealing number.
1073 *
1074 * The heuristic below should work for all ACPI thermal zones which have a
1075 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1076 */
1077static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1078{
1079        if (tz->trips.critical.flags.valid &&
1080            (tz->trips.critical.temperature % 5) == 1)
1081                tz->kelvin_offset = 2731;
1082        else
1083                tz->kelvin_offset = 2732;
1084}
1085
1086static int acpi_thermal_add(struct acpi_device *device)
1087{
1088        int result = 0;
1089        struct acpi_thermal *tz = NULL;
1090
1091
1092        if (!device)
1093                return -EINVAL;
1094
1095        tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1096        if (!tz)
1097                return -ENOMEM;
1098
1099        tz->device = device;
1100        strcpy(tz->name, device->pnp.bus_id);
1101        strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1102        strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1103        device->driver_data = tz;
1104        mutex_init(&tz->lock);
1105
1106
1107        result = acpi_thermal_get_info(tz);
1108        if (result)
1109                goto free_memory;
1110
1111        acpi_thermal_guess_offset(tz);
1112
1113        result = acpi_thermal_register_thermal_zone(tz);
1114        if (result)
1115                goto free_memory;
1116
1117        printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1118               acpi_device_name(device), acpi_device_bid(device),
1119               KELVIN_TO_CELSIUS(tz->temperature));
1120        goto end;
1121
1122free_memory:
1123        kfree(tz);
1124end:
1125        return result;
1126}
1127
1128static int acpi_thermal_remove(struct acpi_device *device)
1129{
1130        struct acpi_thermal *tz = NULL;
1131
1132        if (!device || !acpi_driver_data(device))
1133                return -EINVAL;
1134
1135        tz = acpi_driver_data(device);
1136
1137        acpi_thermal_unregister_thermal_zone(tz);
1138        mutex_destroy(&tz->lock);
1139        kfree(tz);
1140        return 0;
1141}
1142
1143#ifdef CONFIG_PM_SLEEP
1144static int acpi_thermal_resume(struct device *dev)
1145{
1146        struct acpi_thermal *tz;
1147        int i, j, power_state, result;
1148
1149        if (!dev)
1150                return -EINVAL;
1151
1152        tz = acpi_driver_data(to_acpi_device(dev));
1153        if (!tz)
1154                return -EINVAL;
1155
1156        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157                if (!(&tz->trips.active[i]))
1158                        break;
1159                if (!tz->trips.active[i].flags.valid)
1160                        break;
1161                tz->trips.active[i].flags.enabled = 1;
1162                for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163                        result = acpi_bus_update_power(
1164                                        tz->trips.active[i].devices.handles[j],
1165                                        &power_state);
1166                        if (result || (power_state != ACPI_STATE_D0)) {
1167                                tz->trips.active[i].flags.enabled = 0;
1168                                break;
1169                        }
1170                }
1171                tz->state.active |= tz->trips.active[i].flags.enabled;
1172        }
1173
1174        acpi_thermal_check(tz);
1175
1176        return AE_OK;
1177}
1178#endif
1179
1180static int thermal_act(const struct dmi_system_id *d) {
1181
1182        if (act == 0) {
1183                printk(KERN_NOTICE "ACPI: %s detected: "
1184                        "disabling all active thermal trip points\n", d->ident);
1185                act = -1;
1186        }
1187        return 0;
1188}
1189static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191        printk(KERN_NOTICE "ACPI: %s detected: "
1192                "disabling all critical thermal trip point actions.\n", d->ident);
1193        nocrt = 1;
1194        return 0;
1195}
1196static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198        if (tzp == 0) {
1199                printk(KERN_NOTICE "ACPI: %s detected: "
1200                        "enabling thermal zone polling\n", d->ident);
1201                tzp = 300;      /* 300 dS = 30 Seconds */
1202        }
1203        return 0;
1204}
1205static int thermal_psv(const struct dmi_system_id *d) {
1206
1207        if (psv == 0) {
1208                printk(KERN_NOTICE "ACPI: %s detected: "
1209                        "disabling all passive thermal trip points\n", d->ident);
1210                psv = -1;
1211        }
1212        return 0;
1213}
1214
1215static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216        /*
1217         * Award BIOS on this AOpen makes thermal control almost worthless.
1218         * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219         */
1220        {
1221         .callback = thermal_act,
1222         .ident = "AOpen i915GMm-HFS",
1223         .matches = {
1224                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226                },
1227        },
1228        {
1229         .callback = thermal_psv,
1230         .ident = "AOpen i915GMm-HFS",
1231         .matches = {
1232                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234                },
1235        },
1236        {
1237         .callback = thermal_tzp,
1238         .ident = "AOpen i915GMm-HFS",
1239         .matches = {
1240                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242                },
1243        },
1244        {
1245         .callback = thermal_nocrt,
1246         .ident = "Gigabyte GA-7ZX",
1247         .matches = {
1248                DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249                DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250                },
1251        },
1252        {}
1253};
1254
1255static int __init acpi_thermal_init(void)
1256{
1257        int result = 0;
1258
1259        dmi_check_system(thermal_dmi_table);
1260
1261        if (off) {
1262                printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1263                return -ENODEV;
1264        }
1265
1266        result = acpi_bus_register_driver(&acpi_thermal_driver);
1267        if (result < 0)
1268                return -ENODEV;
1269
1270        return 0;
1271}
1272
1273static void __exit acpi_thermal_exit(void)
1274{
1275
1276        acpi_bus_unregister_driver(&acpi_thermal_driver);
1277
1278        return;
1279}
1280
1281module_init(acpi_thermal_init);
1282module_exit(acpi_thermal_exit);
1283
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