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, int type);
 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\n", 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        thermal_zone_device_update(tz->thermal_zone);
 535}
 536
 537/* sys I/F for generic thermal sysfs support */
 538#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 539
 540static int thermal_get_temp(struct thermal_zone_device *thermal,
 541                            unsigned long *temp)
 542{
 543        struct acpi_thermal *tz = thermal->devdata;
 544        int result;
 545
 546        if (!tz)
 547                return -EINVAL;
 548
 549        result = acpi_thermal_get_temperature(tz);
 550        if (result)
 551                return result;
 552
 553        *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 554        return 0;
 555}
 556
 557static int thermal_get_mode(struct thermal_zone_device *thermal,
 558                                enum thermal_device_mode *mode)
 559{
 560        struct acpi_thermal *tz = thermal->devdata;
 561
 562        if (!tz)
 563                return -EINVAL;
 564
 565        *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 566                THERMAL_DEVICE_DISABLED;
 567
 568        return 0;
 569}
 570
 571static int thermal_set_mode(struct thermal_zone_device *thermal,
 572                                enum thermal_device_mode mode)
 573{
 574        struct acpi_thermal *tz = thermal->devdata;
 575        int enable;
 576
 577        if (!tz)
 578                return -EINVAL;
 579
 580        /*
 581         * enable/disable thermal management from ACPI thermal driver
 582         */
 583        if (mode == THERMAL_DEVICE_ENABLED)
 584                enable = 1;
 585        else if (mode == THERMAL_DEVICE_DISABLED)
 586                enable = 0;
 587        else
 588                return -EINVAL;
 589
 590        if (enable != tz->tz_enabled) {
 591                tz->tz_enabled = enable;
 592                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 593                        "%s kernel ACPI thermal control\n",
 594                        tz->tz_enabled ? "Enable" : "Disable"));
 595                acpi_thermal_check(tz);
 596        }
 597        return 0;
 598}
 599
 600static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 601                                 int trip, enum thermal_trip_type *type)
 602{
 603        struct acpi_thermal *tz = thermal->devdata;
 604        int i;
 605
 606        if (!tz || trip < 0)
 607                return -EINVAL;
 608
 609        if (tz->trips.critical.flags.valid) {
 610                if (!trip) {
 611                        *type = THERMAL_TRIP_CRITICAL;
 612                        return 0;
 613                }
 614                trip--;
 615        }
 616
 617        if (tz->trips.hot.flags.valid) {
 618                if (!trip) {
 619                        *type = THERMAL_TRIP_HOT;
 620                        return 0;
 621                }
 622                trip--;
 623        }
 624
 625        if (tz->trips.passive.flags.valid) {
 626                if (!trip) {
 627                        *type = THERMAL_TRIP_PASSIVE;
 628                        return 0;
 629                }
 630                trip--;
 631        }
 632
 633        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 634                tz->trips.active[i].flags.valid; i++) {
 635                if (!trip) {
 636                        *type = THERMAL_TRIP_ACTIVE;
 637                        return 0;
 638                }
 639                trip--;
 640        }
 641
 642        return -EINVAL;
 643}
 644
 645static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 646                                 int trip, unsigned long *temp)
 647{
 648        struct acpi_thermal *tz = thermal->devdata;
 649        int i;
 650
 651        if (!tz || trip < 0)
 652                return -EINVAL;
 653
 654        if (tz->trips.critical.flags.valid) {
 655                if (!trip) {
 656                        *temp = KELVIN_TO_MILLICELSIUS(
 657                                tz->trips.critical.temperature,
 658                                tz->kelvin_offset);
 659                        return 0;
 660                }
 661                trip--;
 662        }
 663
 664        if (tz->trips.hot.flags.valid) {
 665                if (!trip) {
 666                        *temp = KELVIN_TO_MILLICELSIUS(
 667                                tz->trips.hot.temperature,
 668                                tz->kelvin_offset);
 669                        return 0;
 670                }
 671                trip--;
 672        }
 673
 674        if (tz->trips.passive.flags.valid) {
 675                if (!trip) {
 676                        *temp = KELVIN_TO_MILLICELSIUS(
 677                                tz->trips.passive.temperature,
 678                                tz->kelvin_offset);
 679                        return 0;
 680                }
 681                trip--;
 682        }
 683
 684        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 685                tz->trips.active[i].flags.valid; i++) {
 686                if (!trip) {
 687                        *temp = KELVIN_TO_MILLICELSIUS(
 688                                tz->trips.active[i].temperature,
 689                                tz->kelvin_offset);
 690                        return 0;
 691                }
 692                trip--;
 693        }
 694
 695        return -EINVAL;
 696}
 697
 698static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 699                                unsigned long *temperature) {
 700        struct acpi_thermal *tz = thermal->devdata;
 701
 702        if (tz->trips.critical.flags.valid) {
 703                *temperature = KELVIN_TO_MILLICELSIUS(
 704                                tz->trips.critical.temperature,
 705                                tz->kelvin_offset);
 706                return 0;
 707        } else
 708                return -EINVAL;
 709}
 710
 711static int thermal_get_trend(struct thermal_zone_device *thermal,
 712                                int trip, enum thermal_trend *trend)
 713{
 714        struct acpi_thermal *tz = thermal->devdata;
 715        enum thermal_trip_type type;
 716        int i;
 717
 718        if (thermal_get_trip_type(thermal, trip, &type))
 719                return -EINVAL;
 720
 721        if (type == THERMAL_TRIP_ACTIVE) {
 722                /* aggressive active cooling */
 723                *trend = THERMAL_TREND_RAISING;
 724                return 0;
 725        }
 726
 727        /*
 728         * tz->temperature has already been updated by generic thermal layer,
 729         * before this callback being invoked
 730         */
 731        i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
 732                + (tz->trips.passive.tc2
 733                * (tz->temperature - tz->trips.passive.temperature));
 734
 735        if (i > 0)
 736                *trend = THERMAL_TREND_RAISING;
 737        else if (i < 0)
 738                *trend = THERMAL_TREND_DROPPING;
 739        else
 740                *trend = THERMAL_TREND_STABLE;
 741        return 0;
 742}
 743
 744
 745static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 746                           enum thermal_trip_type trip_type)
 747{
 748        u8 type = 0;
 749        struct acpi_thermal *tz = thermal->devdata;
 750
 751        if (trip_type == THERMAL_TRIP_CRITICAL)
 752                type = ACPI_THERMAL_NOTIFY_CRITICAL;
 753        else if (trip_type == THERMAL_TRIP_HOT)
 754                type = ACPI_THERMAL_NOTIFY_HOT;
 755        else
 756                return 0;
 757
 758        acpi_bus_generate_proc_event(tz->device, type, 1);
 759        acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 760                                        dev_name(&tz->device->dev), type, 1);
 761
 762        if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 763                return 1;
 764
 765        return 0;
 766}
 767
 768static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 769                                        struct thermal_cooling_device *cdev,
 770                                        bool bind)
 771{
 772        struct acpi_device *device = cdev->devdata;
 773        struct acpi_thermal *tz = thermal->devdata;
 774        struct acpi_device *dev;
 775        acpi_status status;
 776        acpi_handle handle;
 777        int i;
 778        int j;
 779        int trip = -1;
 780        int result = 0;
 781
 782        if (tz->trips.critical.flags.valid)
 783                trip++;
 784
 785        if (tz->trips.hot.flags.valid)
 786                trip++;
 787
 788        if (tz->trips.passive.flags.valid) {
 789                trip++;
 790                for (i = 0; i < tz->trips.passive.devices.count;
 791                    i++) {
 792                        handle = tz->trips.passive.devices.handles[i];
 793                        status = acpi_bus_get_device(handle, &dev);
 794                        if (ACPI_FAILURE(status) || dev != device)
 795                                continue;
 796                        if (bind)
 797                                result =
 798                                        thermal_zone_bind_cooling_device
 799                                        (thermal, trip, cdev,
 800                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 801                        else
 802                                result =
 803                                        thermal_zone_unbind_cooling_device
 804                                        (thermal, trip, cdev);
 805                        if (result)
 806                                goto failed;
 807                }
 808        }
 809
 810        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 811                if (!tz->trips.active[i].flags.valid)
 812                        break;
 813                trip++;
 814                for (j = 0;
 815                    j < tz->trips.active[i].devices.count;
 816                    j++) {
 817                        handle = tz->trips.active[i].devices.handles[j];
 818                        status = acpi_bus_get_device(handle, &dev);
 819                        if (ACPI_FAILURE(status) || dev != device)
 820                                continue;
 821                        if (bind)
 822                                result = thermal_zone_bind_cooling_device
 823                                        (thermal, trip, cdev,
 824                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 825                        else
 826                                result = thermal_zone_unbind_cooling_device
 827                                        (thermal, trip, cdev);
 828                        if (result)
 829                                goto failed;
 830                }
 831        }
 832
 833        for (i = 0; i < tz->devices.count; i++) {
 834                handle = tz->devices.handles[i];
 835                status = acpi_bus_get_device(handle, &dev);
 836                if (ACPI_SUCCESS(status) && (dev == device)) {
 837                        if (bind)
 838                                result = thermal_zone_bind_cooling_device
 839                                                (thermal, -1, cdev,
 840                                                 THERMAL_NO_LIMIT,
 841                                                 THERMAL_NO_LIMIT);
 842                        else
 843                                result = thermal_zone_unbind_cooling_device
 844                                                (thermal, -1, cdev);
 845                        if (result)
 846                                goto failed;
 847                }
 848        }
 849
 850failed:
 851        return result;
 852}
 853
 854static int
 855acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 856                                        struct thermal_cooling_device *cdev)
 857{
 858        return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 859}
 860
 861static int
 862acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 863                                        struct thermal_cooling_device *cdev)
 864{
 865        return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 866}
 867
 868static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 869        .bind = acpi_thermal_bind_cooling_device,
 870        .unbind = acpi_thermal_unbind_cooling_device,
 871        .get_temp = thermal_get_temp,
 872        .get_mode = thermal_get_mode,
 873        .set_mode = thermal_set_mode,
 874        .get_trip_type = thermal_get_trip_type,
 875        .get_trip_temp = thermal_get_trip_temp,
 876        .get_crit_temp = thermal_get_crit_temp,
 877        .get_trend = thermal_get_trend,
 878        .notify = thermal_notify,
 879};
 880
 881static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 882{
 883        int trips = 0;
 884        int result;
 885        acpi_status status;
 886        int i;
 887
 888        if (tz->trips.critical.flags.valid)
 889                trips++;
 890
 891        if (tz->trips.hot.flags.valid)
 892                trips++;
 893
 894        if (tz->trips.passive.flags.valid)
 895                trips++;
 896
 897        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 898                        tz->trips.active[i].flags.valid; i++, trips++);
 899
 900        if (tz->trips.passive.flags.valid)
 901                tz->thermal_zone =
 902                        thermal_zone_device_register("acpitz", trips, 0, tz,
 903                                                     &acpi_thermal_zone_ops,
 904                                                     tz->trips.passive.tsp*100,
 905                                                     tz->polling_frequency*100);
 906        else
 907                tz->thermal_zone =
 908                        thermal_zone_device_register("acpitz", trips, 0, tz,
 909                                                     &acpi_thermal_zone_ops, 0,
 910                                                     tz->polling_frequency*100);
 911        if (IS_ERR(tz->thermal_zone))
 912                return -ENODEV;
 913
 914        result = sysfs_create_link(&tz->device->dev.kobj,
 915                                   &tz->thermal_zone->device.kobj, "thermal_zone");
 916        if (result)
 917                return result;
 918
 919        result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 920                                   &tz->device->dev.kobj, "device");
 921        if (result)
 922                return result;
 923
 924        status = acpi_attach_data(tz->device->handle,
 925                                  acpi_bus_private_data_handler,
 926                                  tz->thermal_zone);
 927        if (ACPI_FAILURE(status)) {
 928                printk(KERN_ERR PREFIX
 929                                "Error attaching device data\n");
 930                return -ENODEV;
 931        }
 932
 933        tz->tz_enabled = 1;
 934
 935        dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 936                 tz->thermal_zone->id);
 937        return 0;
 938}
 939
 940static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 941{
 942        sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 943        sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 944        thermal_zone_device_unregister(tz->thermal_zone);
 945        tz->thermal_zone = NULL;
 946        acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 947}
 948
 949
 950/* --------------------------------------------------------------------------
 951                                 Driver Interface
 952   -------------------------------------------------------------------------- */
 953
 954static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 955{
 956        struct acpi_thermal *tz = acpi_driver_data(device);
 957
 958
 959        if (!tz)
 960                return;
 961
 962        switch (event) {
 963        case ACPI_THERMAL_NOTIFY_TEMPERATURE:
 964                acpi_thermal_check(tz);
 965                break;
 966        case ACPI_THERMAL_NOTIFY_THRESHOLDS:
 967                acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 968                acpi_thermal_check(tz);
 969                acpi_bus_generate_proc_event(device, event, 0);
 970                acpi_bus_generate_netlink_event(device->pnp.device_class,
 971                                                  dev_name(&device->dev), event, 0);
 972                break;
 973        case ACPI_THERMAL_NOTIFY_DEVICES:
 974                acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 975                acpi_thermal_check(tz);
 976                acpi_bus_generate_proc_event(device, event, 0);
 977                acpi_bus_generate_netlink_event(device->pnp.device_class,
 978                                                  dev_name(&device->dev), event, 0);
 979                break;
 980        default:
 981                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 982                                  "Unsupported event [0x%x]\n", event));
 983                break;
 984        }
 985}
 986
 987static int acpi_thermal_get_info(struct acpi_thermal *tz)
 988{
 989        int result = 0;
 990
 991
 992        if (!tz)
 993                return -EINVAL;
 994
 995        /* Get trip points [_CRT, _PSV, etc.] (required) */
 996        result = acpi_thermal_get_trip_points(tz);
 997        if (result)
 998                return result;
 999
1000        /* Get temperature [_TMP] (required) */
1001        result = acpi_thermal_get_temperature(tz);
1002        if (result)
1003                return result;
1004
1005        /* Set the cooling mode [_SCP] to active cooling (default) */
1006        result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1007        if (!result)
1008                tz->flags.cooling_mode = 1;
1009
1010        /* Get default polling frequency [_TZP] (optional) */
1011        if (tzp)
1012                tz->polling_frequency = tzp;
1013        else
1014                acpi_thermal_get_polling_frequency(tz);
1015
1016        return 0;
1017}
1018
1019/*
1020 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1021 * handles temperature values with a single decimal place. As a consequence,
1022 * some implementations use an offset of 273.1 and others use an offset of
1023 * 273.2. Try to find out which one is being used, to present the most
1024 * accurate and visually appealing number.
1025 *
1026 * The heuristic below should work for all ACPI thermal zones which have a
1027 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1028 */
1029static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1030{
1031        if (tz->trips.critical.flags.valid &&
1032            (tz->trips.critical.temperature % 5) == 1)
1033                tz->kelvin_offset = 2731;
1034        else
1035                tz->kelvin_offset = 2732;
1036}
1037
1038static int acpi_thermal_add(struct acpi_device *device)
1039{
1040        int result = 0;
1041        struct acpi_thermal *tz = NULL;
1042
1043
1044        if (!device)
1045                return -EINVAL;
1046
1047        tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1048        if (!tz)
1049                return -ENOMEM;
1050
1051        tz->device = device;
1052        strcpy(tz->name, device->pnp.bus_id);
1053        strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1054        strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1055        device->driver_data = tz;
1056        mutex_init(&tz->lock);
1057
1058
1059        result = acpi_thermal_get_info(tz);
1060        if (result)
1061                goto free_memory;
1062
1063        acpi_thermal_guess_offset(tz);
1064
1065        result = acpi_thermal_register_thermal_zone(tz);
1066        if (result)
1067                goto free_memory;
1068
1069        printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1070               acpi_device_name(device), acpi_device_bid(device),
1071               KELVIN_TO_CELSIUS(tz->temperature));
1072        goto end;
1073
1074free_memory:
1075        kfree(tz);
1076end:
1077        return result;
1078}
1079
1080static int acpi_thermal_remove(struct acpi_device *device, int type)
1081{
1082        struct acpi_thermal *tz = NULL;
1083
1084        if (!device || !acpi_driver_data(device))
1085                return -EINVAL;
1086
1087        tz = acpi_driver_data(device);
1088
1089        acpi_thermal_unregister_thermal_zone(tz);
1090        mutex_destroy(&tz->lock);
1091        kfree(tz);
1092        return 0;
1093}
1094
1095#ifdef CONFIG_PM_SLEEP
1096static int acpi_thermal_resume(struct device *dev)
1097{
1098        struct acpi_thermal *tz;
1099        int i, j, power_state, result;
1100
1101        if (!dev)
1102                return -EINVAL;
1103
1104        tz = acpi_driver_data(to_acpi_device(dev));
1105        if (!tz)
1106                return -EINVAL;
1107
1108        for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1109                if (!(&tz->trips.active[i]))
1110                        break;
1111                if (!tz->trips.active[i].flags.valid)
1112                        break;
1113                tz->trips.active[i].flags.enabled = 1;
1114                for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1115                        result = acpi_bus_update_power(
1116                                        tz->trips.active[i].devices.handles[j],
1117                                        &power_state);
1118                        if (result || (power_state != ACPI_STATE_D0)) {
1119                                tz->trips.active[i].flags.enabled = 0;
1120                                break;
1121                        }
1122                }
1123                tz->state.active |= tz->trips.active[i].flags.enabled;
1124        }
1125
1126        acpi_thermal_check(tz);
1127
1128        return AE_OK;
1129}
1130#endif
1131
1132static int thermal_act(const struct dmi_system_id *d) {
1133
1134        if (act == 0) {
1135                printk(KERN_NOTICE "ACPI: %s detected: "
1136                        "disabling all active thermal trip points\n", d->ident);
1137                act = -1;
1138        }
1139        return 0;
1140}
1141static int thermal_nocrt(const struct dmi_system_id *d) {
1142
1143        printk(KERN_NOTICE "ACPI: %s detected: "
1144                "disabling all critical thermal trip point actions.\n", d->ident);
1145        nocrt = 1;
1146        return 0;
1147}
1148static int thermal_tzp(const struct dmi_system_id *d) {
1149
1150        if (tzp == 0) {
1151                printk(KERN_NOTICE "ACPI: %s detected: "
1152                        "enabling thermal zone polling\n", d->ident);
1153                tzp = 300;      /* 300 dS = 30 Seconds */
1154        }
1155        return 0;
1156}
1157static int thermal_psv(const struct dmi_system_id *d) {
1158
1159        if (psv == 0) {
1160                printk(KERN_NOTICE "ACPI: %s detected: "
1161                        "disabling all passive thermal trip points\n", d->ident);
1162                psv = -1;
1163        }
1164        return 0;
1165}
1166
1167static struct dmi_system_id thermal_dmi_table[] __initdata = {
1168        /*
1169         * Award BIOS on this AOpen makes thermal control almost worthless.
1170         * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1171         */
1172        {
1173         .callback = thermal_act,
1174         .ident = "AOpen i915GMm-HFS",
1175         .matches = {
1176                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1177                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1178                },
1179        },
1180        {
1181         .callback = thermal_psv,
1182         .ident = "AOpen i915GMm-HFS",
1183         .matches = {
1184                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1185                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1186                },
1187        },
1188        {
1189         .callback = thermal_tzp,
1190         .ident = "AOpen i915GMm-HFS",
1191         .matches = {
1192                DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1193                DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1194                },
1195        },
1196        {
1197         .callback = thermal_nocrt,
1198         .ident = "Gigabyte GA-7ZX",
1199         .matches = {
1200                DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1201                DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1202                },
1203        },
1204        {}
1205};
1206
1207static int __init acpi_thermal_init(void)
1208{
1209        int result = 0;
1210
1211        dmi_check_system(thermal_dmi_table);
1212
1213        if (off) {
1214                printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1215                return -ENODEV;
1216        }
1217
1218        result = acpi_bus_register_driver(&acpi_thermal_driver);
1219        if (result < 0)
1220                return -ENODEV;
1221
1222        return 0;
1223}
1224
1225static void __exit acpi_thermal_exit(void)
1226{
1227
1228        acpi_bus_unregister_driver(&acpi_thermal_driver);
1229
1230        return;
1231}
1232
1233module_init(acpi_thermal_init);
1234module_exit(acpi_thermal_exit);
1235
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