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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/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_COMPONENT          0x04000000
  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 KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int act;
  79 module_param(act, int, 0644);
  80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  81
  82 static int crt;
  83 module_param(crt, int, 0644);
  84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  85
  86 static int tzp;
  87 module_param(tzp, int, 0444);
  88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  89
  90 static int nocrt;
  91 module_param(nocrt, int, 0);
  92 MODULE_PARM_DESC(nocrt, "Set to disable action on ACPI thermal zone critical and hot trips.");
  93
  94 static int off;
  95 module_param(off, int, 0);
  96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  97
  98 static int psv;
  99 module_param(psv, int, 0644);
 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 101
 102 static int acpi_thermal_add(struct acpi_device *device);
 103 static int acpi_thermal_remove(struct acpi_device *device, int type);
 104 static int acpi_thermal_resume(struct acpi_device *device);
 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 110                                                const char __user *, size_t,
 111                                                loff_t *);
 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 114                                           size_t, loff_t *);
 115
 116 static const struct acpi_device_id  thermal_device_ids[] = {
 117         {ACPI_THERMAL_HID, 0},
 118         {"", 0},
 119 };
 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 121
 122 static struct acpi_driver acpi_thermal_driver = {
 123         .name = "thermal",
 124         .class = ACPI_THERMAL_CLASS,
 125         .ids = thermal_device_ids,
 126         .ops = {
 127                 .add = acpi_thermal_add,
 128                 .remove = acpi_thermal_remove,
 129                 .resume = acpi_thermal_resume,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct timer_list timer;
 198 };
 199
 200 static const struct file_operations acpi_thermal_state_fops = {
 201         .open = acpi_thermal_state_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static const struct file_operations acpi_thermal_temp_fops = {
 208         .open = acpi_thermal_temp_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static const struct file_operations acpi_thermal_trip_fops = {
 215         .open = acpi_thermal_trip_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static const struct file_operations acpi_thermal_cooling_fops = {
 222         .open = acpi_thermal_cooling_open_fs,
 223         .read = seq_read,
 224         .write = acpi_thermal_write_cooling_mode,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 static const struct file_operations acpi_thermal_polling_fops = {
 230         .open = acpi_thermal_polling_open_fs,
 231         .read = seq_read,
 232         .write = acpi_thermal_write_polling,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* --------------------------------------------------------------------------
 238                              Thermal Zone Management
 239    -------------------------------------------------------------------------- */
 240
 241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         tz->last_temperature = tz->temperature;
 250
 251         status =
 252             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 253         if (ACPI_FAILURE(status))
 254                 return -ENODEV;
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 257                           tz->temperature));
 258
 259         return 0;
 260 }
 261
 262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 263 {
 264         acpi_status status = AE_OK;
 265
 266
 267         if (!tz)
 268                 return -EINVAL;
 269
 270         status =
 271             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 272                                   &tz->polling_frequency);
 273         if (ACPI_FAILURE(status))
 274                 return -ENODEV;
 275
 276         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 277                           tz->polling_frequency));
 278
 279         return 0;
 280 }
 281
 282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 283 {
 284
 285         if (!tz)
 286                 return -EINVAL;
 287
 288         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 289
 290         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 291                           "Polling frequency set to %lu seconds\n",
 292                           tz->polling_frequency/10));
 293
 294         return 0;
 295 }
 296
 297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 298 {
 299         acpi_status status = AE_OK;
 300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 301         struct acpi_object_list arg_list = { 1, &arg0 };
 302         acpi_handle handle = NULL;
 303
 304
 305         if (!tz)
 306                 return -EINVAL;
 307
 308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 309         if (ACPI_FAILURE(status)) {
 310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 311                 return -ENODEV;
 312         }
 313
 314         arg0.integer.value = mode;
 315
 316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 317         if (ACPI_FAILURE(status))
 318                 return -ENODEV;
 319
 320         return 0;
 321 }
 322
 323 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 324 {
 325         acpi_status status = AE_OK;
 326         int i = 0;
 327
 328
 329         if (!tz)
 330                 return -EINVAL;
 331
 332         /* Critical Shutdown (required) */
 333
 334         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 335                                        &tz->trips.critical.temperature);
 336         if (ACPI_FAILURE(status)) {
 337                 tz->trips.critical.flags.valid = 0;
 338                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 339                 return -ENODEV;
 340         } else {
 341                 tz->trips.critical.flags.valid = 1;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 343                                   "Found critical threshold [%lu]\n",
 344                                   tz->trips.critical.temperature));
 345         }
 346
 347         if (tz->trips.critical.flags.valid == 1) {
 348                 if (crt == -1) {
 349                         tz->trips.critical.flags.valid = 0;
 350                 } else if (crt > 0) {
 351                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 352
 353                         /*
 354                          * Allow override to lower critical threshold
 355                          */
 356                         if (crt_k < tz->trips.critical.temperature)
 357                                 tz->trips.critical.temperature = crt_k;
 358                 }
 359         }
 360
 361         /* Critical Sleep (optional) */
 362
 363         status =
 364             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 365                                   &tz->trips.hot.temperature);
 366         if (ACPI_FAILURE(status)) {
 367                 tz->trips.hot.flags.valid = 0;
 368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 369         } else {
 370                 tz->trips.hot.flags.valid = 1;
 371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 372                                   tz->trips.hot.temperature));
 373         }
 374
 375         /* Passive: Processors (optional) */
 376
 377         if (psv == -1) {
 378                 status = AE_SUPPORT;
 379         } else if (psv > 0) {
 380                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 381                 status = AE_OK;
 382         } else {
 383                 status = acpi_evaluate_integer(tz->device->handle,
 384                         "_PSV", NULL, &tz->trips.passive.temperature);
 385         }
 386
 387         if (ACPI_FAILURE(status)) {
 388                 tz->trips.passive.flags.valid = 0;
 389                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 390         } else {
 391                 tz->trips.passive.flags.valid = 1;
 392
 393                 status =
 394                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 395                                           &tz->trips.passive.tc1);
 396                 if (ACPI_FAILURE(status))
 397                         tz->trips.passive.flags.valid = 0;
 398
 399                 status =
 400                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 401                                           &tz->trips.passive.tc2);
 402                 if (ACPI_FAILURE(status))
 403                         tz->trips.passive.flags.valid = 0;
 404
 405                 status =
 406                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 407                                           &tz->trips.passive.tsp);
 408                 if (ACPI_FAILURE(status))
 409                         tz->trips.passive.flags.valid = 0;
 410
 411                 status =
 412                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 413                                             &tz->trips.passive.devices);
 414                 if (ACPI_FAILURE(status))
 415                         tz->trips.passive.flags.valid = 0;
 416
 417                 if (!tz->trips.passive.flags.valid)
 418                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 419                 else
 420                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 421                                           "Found passive threshold [%lu]\n",
 422                                           tz->trips.passive.temperature));
 423         }
 424
 425         /* Active: Fans, etc. (optional) */
 426
 427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 428
 429                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 430
 431                 if (act == -1)
 432                         break;  /* disable all active trip points */
 433
 434                 status = acpi_evaluate_integer(tz->device->handle,
 435                         name, NULL, &tz->trips.active[i].temperature);
 436
 437                 if (ACPI_FAILURE(status)) {
 438                         if (i == 0)     /* no active trip points */
 439                                 break;
 440                         if (act <= 0)   /* no override requested */
 441                                 break;
 442                         if (i == 1) {   /* 1 trip point */
 443                                 tz->trips.active[0].temperature =
 444                                         CELSIUS_TO_KELVIN(act);
 445                         } else {        /* multiple trips */
 446                                 /*
 447                                  * Don't allow override higher than
 448                                  * the next higher trip point
 449                                  */
 450                                 tz->trips.active[i - 1].temperature =
 451                                     (tz->trips.active[i - 2].temperature <
 452                                         CELSIUS_TO_KELVIN(act) ?
 453                                         tz->trips.active[i - 2].temperature :
 454                                         CELSIUS_TO_KELVIN(act));
 455                         }
 456                         break;
 457                 }
 458
 459                 name[2] = 'L';
 460                 status =
 461                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 462                                             &tz->trips.active[i].devices);
 463                 if (ACPI_SUCCESS(status)) {
 464                         tz->trips.active[i].flags.valid = 1;
 465                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 466                                           "Found active threshold [%d]:[%lu]\n",
 467                                           i, tz->trips.active[i].temperature));
 468                 } else
 469                         ACPI_EXCEPTION((AE_INFO, status,
 470                                         "Invalid active threshold [%d]", i));
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 477 {
 478         acpi_status status = AE_OK;
 479
 480
 481         if (!tz)
 482                 return -EINVAL;
 483
 484         status =
 485             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 486         if (ACPI_FAILURE(status))
 487                 return -ENODEV;
 488
 489         return 0;
 490 }
 491
 492 static int acpi_thermal_critical(struct acpi_thermal *tz)
 493 {
 494         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 495                 return -EINVAL;
 496
 497         if (tz->temperature >= tz->trips.critical.temperature) {
 498                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 499                 tz->trips.critical.flags.enabled = 1;
 500         } else if (tz->trips.critical.flags.enabled)
 501                 tz->trips.critical.flags.enabled = 0;
 502
 503         printk(KERN_EMERG
 504                "Critical temperature reached (%ld C), shutting down.\n",
 505                KELVIN_TO_CELSIUS(tz->temperature));
 506         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 507                                 tz->trips.critical.flags.enabled);
 508
 509         orderly_poweroff(true);
 510
 511         return 0;
 512 }
 513
 514 static int acpi_thermal_hot(struct acpi_thermal *tz)
 515 {
 516         if (!tz || !tz->trips.hot.flags.valid || nocrt)
 517                 return -EINVAL;
 518
 519         if (tz->temperature >= tz->trips.hot.temperature) {
 520                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 521                 tz->trips.hot.flags.enabled = 1;
 522         } else if (tz->trips.hot.flags.enabled)
 523                 tz->trips.hot.flags.enabled = 0;
 524
 525         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 526                                 tz->trips.hot.flags.enabled);
 527
 528         /* TBD: Call user-mode "sleep(S4)" function */
 529
 530         return 0;
 531 }
 532
 533 static void acpi_thermal_passive(struct acpi_thermal *tz)
 534 {
 535         int result = 1;
 536         struct acpi_thermal_passive *passive = NULL;
 537         int trend = 0;
 538         int i = 0;
 539
 540
 541         if (!tz || !tz->trips.passive.flags.valid)
 542                 return;
 543
 544         passive = &(tz->trips.passive);
 545
 546         /*
 547          * Above Trip?
 548          * -----------
 549          * Calculate the thermal trend (using the passive cooling equation)
 550          * and modify the performance limit for all passive cooling devices
 551          * accordingly.  Note that we assume symmetry.
 552          */
 553         if (tz->temperature >= passive->temperature) {
 554                 trend =
 555                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 556                     (passive->tc2 * (tz->temperature - passive->temperature));
 557                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 558                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 559                                   trend, passive->tc1, tz->temperature,
 560                                   tz->last_temperature, passive->tc2,
 561                                   tz->temperature, passive->temperature));
 562                 passive->flags.enabled = 1;
 563                 /* Heating up? */
 564                 if (trend > 0)
 565                         for (i = 0; i < passive->devices.count; i++)
 566                                 acpi_processor_set_thermal_limit(passive->
 567                                                                  devices.
 568                                                                  handles[i],
 569                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 570                 /* Cooling off? */
 571                 else if (trend < 0) {
 572                         for (i = 0; i < passive->devices.count; i++)
 573                                 /*
 574                                  * assume that we are on highest
 575                                  * freq/lowest thrott and can leave
 576                                  * passive mode, even in error case
 577                                  */
 578                                 if (!acpi_processor_set_thermal_limit
 579                                     (passive->devices.handles[i],
 580                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 581                                         result = 0;
 582                         /*
 583                          * Leave cooling mode, even if the temp might
 584                          * higher than trip point This is because some
 585                          * machines might have long thermal polling
 586                          * frequencies (tsp) defined. We will fall back
 587                          * into passive mode in next cycle (probably quicker)
 588                          */
 589                         if (result) {
 590                                 passive->flags.enabled = 0;
 591                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 592                                                   "Disabling passive cooling, still above threshold,"
 593                                                   " but we are cooling down\n"));
 594                         }
 595                 }
 596                 return;
 597         }
 598
 599         /*
 600          * Below Trip?
 601          * -----------
 602          * Implement passive cooling hysteresis to slowly increase performance
 603          * and avoid thrashing around the passive trip point.  Note that we
 604          * assume symmetry.
 605          */
 606         if (!passive->flags.enabled)
 607                 return;
 608         for (i = 0; i < passive->devices.count; i++)
 609                 if (!acpi_processor_set_thermal_limit
 610                     (passive->devices.handles[i],
 611                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 612                         result = 0;
 613         if (result) {
 614                 passive->flags.enabled = 0;
 615                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 616                                   "Disabling passive cooling (zone is cool)\n"));
 617         }
 618 }
 619
 620 static void acpi_thermal_active(struct acpi_thermal *tz)
 621 {
 622         int result = 0;
 623         struct acpi_thermal_active *active = NULL;
 624         int i = 0;
 625         int j = 0;
 626         unsigned long maxtemp = 0;
 627
 628
 629         if (!tz)
 630                 return;
 631
 632         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 633                 active = &(tz->trips.active[i]);
 634                 if (!active || !active->flags.valid)
 635                         break;
 636                 if (tz->temperature >= active->temperature) {
 637                         /*
 638                          * Above Threshold?
 639                          * ----------------
 640                          * If not already enabled, turn ON all cooling devices
 641                          * associated with this active threshold.
 642                          */
 643                         if (active->temperature > maxtemp)
 644                                 tz->state.active_index = i;
 645                         maxtemp = active->temperature;
 646                         if (active->flags.enabled)
 647                                 continue;
 648                         for (j = 0; j < active->devices.count; j++) {
 649                                 result =
 650                                     acpi_bus_set_power(active->devices.
 651                                                        handles[j],
 652                                                        ACPI_STATE_D0);
 653                                 if (result) {
 654                                         printk(KERN_WARNING PREFIX
 655                                                       "Unable to turn cooling device [%p] 'on'\n",
 656                                                       active->devices.
 657                                                       handles[j]);
 658                                         continue;
 659                                 }
 660                                 active->flags.enabled = 1;
 661                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 662                                                   "Cooling device [%p] now 'on'\n",
 663                                                   active->devices.handles[j]));
 664                         }
 665                         continue;
 666                 }
 667                 if (!active->flags.enabled)
 668                         continue;
 669                 /*
 670                  * Below Threshold?
 671                  * ----------------
 672                  * Turn OFF all cooling devices associated with this
 673                  * threshold.
 674                  */
 675                 for (j = 0; j < active->devices.count; j++) {
 676                         result = acpi_bus_set_power(active->devices.handles[j],
 677                                                     ACPI_STATE_D3);
 678                         if (result) {
 679                                 printk(KERN_WARNING PREFIX
 680                                               "Unable to turn cooling device [%p] 'off'\n",
 681                                               active->devices.handles[j]);
 682                                 continue;
 683                         }
 684                         active->flags.enabled = 0;
 685                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 686                                           "Cooling device [%p] now 'off'\n",
 687                                           active->devices.handles[j]));
 688                 }
 689         }
 690 }
 691
 692 static void acpi_thermal_check(void *context);
 693
 694 static void acpi_thermal_run(unsigned long data)
 695 {
 696         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 697         if (!tz->zombie)
 698                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 699 }
 700
 701 static void acpi_thermal_check(void *data)
 702 {
 703         int result = 0;
 704         struct acpi_thermal *tz = data;
 705         unsigned long sleep_time = 0;
 706         int i = 0;
 707         struct acpi_thermal_state state;
 708
 709
 710         if (!tz) {
 711                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 712                 return;
 713         }
 714
 715         state = tz->state;
 716
 717         result = acpi_thermal_get_temperature(tz);
 718         if (result)
 719                 return;
 720
 721         memset(&tz->state, 0, sizeof(tz->state));
 722
 723         /*
 724          * Check Trip Points
 725          * -----------------
 726          * Compare the current temperature to the trip point values to see
 727          * if we've entered one of the thermal policy states.  Note that
 728          * this function determines when a state is entered, but the
 729          * individual policy decides when it is exited (e.g. hysteresis).
 730          */
 731         if (tz->trips.critical.flags.valid)
 732                 state.critical |=
 733                     (tz->temperature >= tz->trips.critical.temperature);
 734         if (tz->trips.hot.flags.valid)
 735                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 736         if (tz->trips.passive.flags.valid)
 737                 state.passive |=
 738                     (tz->temperature >= tz->trips.passive.temperature);
 739         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 740                 if (tz->trips.active[i].flags.valid)
 741                         state.active |=
 742                             (tz->temperature >=
 743                              tz->trips.active[i].temperature);
 744
 745         /*
 746          * Invoke Policy
 747          * -------------
 748          * Separated from the above check to allow individual policy to
 749          * determine when to exit a given state.
 750          */
 751         if (state.critical)
 752                 acpi_thermal_critical(tz);
 753         if (state.hot)
 754                 acpi_thermal_hot(tz);
 755         if (state.passive)
 756                 acpi_thermal_passive(tz);
 757         if (state.active)
 758                 acpi_thermal_active(tz);
 759
 760         /*
 761          * Calculate State
 762          * ---------------
 763          * Again, separated from the above two to allow independent policy
 764          * decisions.
 765          */
 766         tz->state.critical = tz->trips.critical.flags.enabled;
 767         tz->state.hot = tz->trips.hot.flags.enabled;
 768         tz->state.passive = tz->trips.passive.flags.enabled;
 769         tz->state.active = 0;
 770         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 771                 tz->state.active |= tz->trips.active[i].flags.enabled;
 772
 773         /*
 774          * Calculate Sleep Time
 775          * --------------------
 776          * If we're in the passive state, use _TSP's value.  Otherwise
 777          * use the default polling frequency (e.g. _TZP).  If no polling
 778          * frequency is specified then we'll wait forever (at least until
 779          * a thermal event occurs).  Note that _TSP and _TZD values are
 780          * given in 1/10th seconds (we must covert to milliseconds).
 781          */
 782         if (tz->state.passive)
 783                 sleep_time = tz->trips.passive.tsp * 100;
 784         else if (tz->polling_frequency > 0)
 785                 sleep_time = tz->polling_frequency * 100;
 786
 787         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 788                           tz->name, tz->temperature, sleep_time));
 789
 790         /*
 791          * Schedule Next Poll
 792          * ------------------
 793          */
 794         if (!sleep_time) {
 795                 if (timer_pending(&(tz->timer)))
 796                         del_timer(&(tz->timer));
 797         } else {
 798                 if (timer_pending(&(tz->timer)))
 799                         mod_timer(&(tz->timer),
 800                                         jiffies + (HZ * sleep_time) / 1000);
 801                 else {
 802                         tz->timer.data = (unsigned long)tz;
 803                         tz->timer.function = acpi_thermal_run;
 804                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 805                         add_timer(&(tz->timer));
 806                 }
 807         }
 808
 809         return;
 810 }
 811
 812 /* --------------------------------------------------------------------------
 813                               FS Interface (/proc)
 814    -------------------------------------------------------------------------- */
 815
 816 static struct proc_dir_entry *acpi_thermal_dir;
 817
 818 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 819 {
 820         struct acpi_thermal *tz = seq->private;
 821
 822
 823         if (!tz)
 824                 goto end;
 825
 826         seq_puts(seq, "state:                   ");
 827
 828         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 829             && !tz->state.active)
 830                 seq_puts(seq, "ok\n");
 831         else {
 832                 if (tz->state.critical)
 833                         seq_puts(seq, "critical ");
 834                 if (tz->state.hot)
 835                         seq_puts(seq, "hot ");
 836                 if (tz->state.passive)
 837                         seq_puts(seq, "passive ");
 838                 if (tz->state.active)
 839                         seq_printf(seq, "active[%d]", tz->state.active_index);
 840                 seq_puts(seq, "\n");
 841         }
 842
 843       end:
 844         return 0;
 845 }
 846
 847 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 848 {
 849         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 850 }
 851
 852 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 853 {
 854         int result = 0;
 855         struct acpi_thermal *tz = seq->private;
 856
 857
 858         if (!tz)
 859                 goto end;
 860
 861         result = acpi_thermal_get_temperature(tz);
 862         if (result)
 863                 goto end;
 864
 865         seq_printf(seq, "temperature:             %ld C\n",
 866                    KELVIN_TO_CELSIUS(tz->temperature));
 867
 868       end:
 869         return 0;
 870 }
 871
 872 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 873 {
 874         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 875 }
 876
 877 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 878 {
 879         struct acpi_thermal *tz = seq->private;
 880         struct acpi_device *device;
 881         acpi_status status;
 882
 883         int i = 0;
 884         int j = 0;
 885
 886
 887         if (!tz)
 888                 goto end;
 889
 890         if (tz->trips.critical.flags.valid)
 891                 seq_printf(seq, "critical (S5):           %ld C%s",
 892                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 893                            nocrt ? " <disabled>\n" : "\n");
 894
 895         if (tz->trips.hot.flags.valid)
 896                 seq_printf(seq, "hot (S4):                %ld C%s",
 897                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 898                            nocrt ? " <disabled>\n" : "\n");
 899
 900         if (tz->trips.passive.flags.valid) {
 901                 seq_printf(seq,
 902                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 903                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 904                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 905                            tz->trips.passive.tsp);
 906                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 907                         status = acpi_bus_get_device(tz->trips.passive.devices.
 908                                                      handles[j], &device);
 909                         seq_printf(seq, "%4.4s ", status ? "" :
 910                                    acpi_device_bid(device));
 911                 }
 912                 seq_puts(seq, "\n");
 913         }
 914
 915         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 916                 if (!(tz->trips.active[i].flags.valid))
 917                         break;
 918                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 919                            i,
 920                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 921                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 922                         status = acpi_bus_get_device(tz->trips.active[i].
 923                                                      devices.handles[j],
 924                                                      &device);
 925                         seq_printf(seq, "%4.4s ", status ? "" :
 926                                    acpi_device_bid(device));
 927                 }
 928                 seq_puts(seq, "\n");
 929         }
 930
 931       end:
 932         return 0;
 933 }
 934
 935 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 936 {
 937         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 938 }
 939
 940 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 941 {
 942         struct acpi_thermal *tz = seq->private;
 943
 944
 945         if (!tz)
 946                 goto end;
 947
 948         if (!tz->flags.cooling_mode)
 949                 seq_puts(seq, "<setting not supported>\n");
 950         else
 951                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 952
 953       end:
 954         return 0;
 955 }
 956
 957 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 958 {
 959         return single_open(file, acpi_thermal_cooling_seq_show,
 960                            PDE(inode)->data);
 961 }
 962
 963 static ssize_t
 964 acpi_thermal_write_cooling_mode(struct file *file,
 965                                 const char __user * buffer,
 966                                 size_t count, loff_t * ppos)
 967 {
 968         struct seq_file *m = file->private_data;
 969         struct acpi_thermal *tz = m->private;
 970         int result = 0;
 971         char mode_string[12] = { '\0' };
 972
 973
 974         if (!tz || (count > sizeof(mode_string) - 1))
 975                 return -EINVAL;
 976
 977         if (!tz->flags.cooling_mode)
 978                 return -ENODEV;
 979
 980         if (copy_from_user(mode_string, buffer, count))
 981                 return -EFAULT;
 982
 983         mode_string[count] = '\0';
 984
 985         result = acpi_thermal_set_cooling_mode(tz,
 986                                                simple_strtoul(mode_string, NULL,
 987                                                               0));
 988         if (result)
 989                 return result;
 990
 991         acpi_thermal_check(tz);
 992
 993         return count;
 994 }
 995
 996 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
 997 {
 998         struct acpi_thermal *tz = seq->private;
 999
1000
1001         if (!tz)
1002                 goto end;
1003
1004         if (!tz->polling_frequency) {
1005                 seq_puts(seq, "<polling disabled>\n");
1006                 goto end;
1007         }
1008
1009         seq_printf(seq, "polling frequency:       %lu seconds\n",
1010                    (tz->polling_frequency / 10));
1011
1012       end:
1013         return 0;
1014 }
1015
1016 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1017 {
1018         return single_open(file, acpi_thermal_polling_seq_show,
1019                            PDE(inode)->data);
1020 }
1021
1022 static ssize_t
1023 acpi_thermal_write_polling(struct file *file,
1024                            const char __user * buffer,
1025                            size_t count, loff_t * ppos)
1026 {
1027         struct seq_file *m = file->private_data;
1028         struct acpi_thermal *tz = m->private;
1029         int result = 0;
1030         char polling_string[12] = { '\0' };
1031         int seconds = 0;
1032
1033
1034         if (!tz || (count > sizeof(polling_string) - 1))
1035                 return -EINVAL;
1036
1037         if (copy_from_user(polling_string, buffer, count))
1038                 return -EFAULT;
1039
1040         polling_string[count] = '\0';
1041
1042         seconds = simple_strtoul(polling_string, NULL, 0);
1043
1044         result = acpi_thermal_set_polling(tz, seconds);
1045         if (result)
1046                 return result;
1047
1048         acpi_thermal_check(tz);
1049
1050         return count;
1051 }
1052
1053 static int acpi_thermal_add_fs(struct acpi_device *device)
1054 {
1055         struct proc_dir_entry *entry = NULL;
1056
1057
1058         if (!acpi_device_dir(device)) {
1059                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1060                                                      acpi_thermal_dir);
1061                 if (!acpi_device_dir(device))
1062                         return -ENODEV;
1063                 acpi_device_dir(device)->owner = THIS_MODULE;
1064         }
1065
1066         /* 'state' [R] */
1067         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1068                                   S_IRUGO, acpi_device_dir(device));
1069         if (!entry)
1070                 return -ENODEV;
1071         else {
1072                 entry->proc_fops = &acpi_thermal_state_fops;
1073                 entry->data = acpi_driver_data(device);
1074                 entry->owner = THIS_MODULE;
1075         }
1076
1077         /* 'temperature' [R] */
1078         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1079                                   S_IRUGO, acpi_device_dir(device));
1080         if (!entry)
1081                 return -ENODEV;
1082         else {
1083                 entry->proc_fops = &acpi_thermal_temp_fops;
1084                 entry->data = acpi_driver_data(device);
1085                 entry->owner = THIS_MODULE;
1086         }
1087
1088         /* 'trip_points' [R/W] */
1089         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1090                                   S_IFREG | S_IRUGO | S_IWUSR,
1091                                   acpi_device_dir(device));
1092         if (!entry)
1093                 return -ENODEV;
1094         else {
1095                 entry->proc_fops = &acpi_thermal_trip_fops;
1096                 entry->data = acpi_driver_data(device);
1097                 entry->owner = THIS_MODULE;
1098         }
1099
1100         /* 'cooling_mode' [R/W] */
1101         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1102                                   S_IFREG | S_IRUGO | S_IWUSR,
1103                                   acpi_device_dir(device));
1104         if (!entry)
1105                 return -ENODEV;
1106         else {
1107                 entry->proc_fops = &acpi_thermal_cooling_fops;
1108                 entry->data = acpi_driver_data(device);
1109                 entry->owner = THIS_MODULE;
1110         }
1111
1112         /* 'polling_frequency' [R/W] */
1113         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1114                                   S_IFREG | S_IRUGO | S_IWUSR,
1115                                   acpi_device_dir(device));
1116         if (!entry)
1117                 return -ENODEV;
1118         else {
1119                 entry->proc_fops = &acpi_thermal_polling_fops;
1120                 entry->data = acpi_driver_data(device);
1121                 entry->owner = THIS_MODULE;
1122         }
1123
1124         return 0;
1125 }
1126
1127 static int acpi_thermal_remove_fs(struct acpi_device *device)
1128 {
1129
1130         if (acpi_device_dir(device)) {
1131                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1132                                   acpi_device_dir(device));
1133                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1134                                   acpi_device_dir(device));
1135                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1136                                   acpi_device_dir(device));
1137                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1138                                   acpi_device_dir(device));
1139                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1140                                   acpi_device_dir(device));
1141                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1142                 acpi_device_dir(device) = NULL;
1143         }
1144
1145         return 0;
1146 }
1147
1148 /* --------------------------------------------------------------------------
1149                                  Driver Interface
1150    -------------------------------------------------------------------------- */
1151
1152 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1153 {
1154         struct acpi_thermal *tz = data;
1155         struct acpi_device *device = NULL;
1156
1157
1158         if (!tz)
1159                 return;
1160
1161         device = tz->device;
1162
1163         switch (event) {
1164         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1165                 acpi_thermal_check(tz);
1166                 break;
1167         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1168                 acpi_thermal_get_trip_points(tz);
1169                 acpi_thermal_check(tz);
1170                 acpi_bus_generate_event(device, event, 0);
1171                 break;
1172         case ACPI_THERMAL_NOTIFY_DEVICES:
1173                 if (tz->flags.devices)
1174                         acpi_thermal_get_devices(tz);
1175                 acpi_bus_generate_event(device, event, 0);
1176                 break;
1177         default:
1178                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1179                                   "Unsupported event [0x%x]\n", event));
1180                 break;
1181         }
1182
1183         return;
1184 }
1185
1186 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1187 {
1188         int result = 0;
1189
1190
1191         if (!tz)
1192                 return -EINVAL;
1193
1194         /* Get temperature [_TMP] (required) */
1195         result = acpi_thermal_get_temperature(tz);
1196         if (result)
1197                 return result;
1198
1199         /* Get trip points [_CRT, _PSV, etc.] (required) */
1200         result = acpi_thermal_get_trip_points(tz);
1201         if (result)
1202                 return result;
1203
1204         /* Set the cooling mode [_SCP] to active cooling (default) */
1205         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1206         if (!result)
1207                 tz->flags.cooling_mode = 1;
1208
1209         /* Get default polling frequency [_TZP] (optional) */
1210         if (tzp)
1211                 tz->polling_frequency = tzp;
1212         else
1213                 acpi_thermal_get_polling_frequency(tz);
1214
1215         /* Get devices in this thermal zone [_TZD] (optional) */
1216         result = acpi_thermal_get_devices(tz);
1217         if (!result)
1218                 tz->flags.devices = 1;
1219
1220         return 0;
1221 }
1222
1223 static int acpi_thermal_add(struct acpi_device *device)
1224 {
1225         int result = 0;
1226         acpi_status status = AE_OK;
1227         struct acpi_thermal *tz = NULL;
1228
1229
1230         if (!device)
1231                 return -EINVAL;
1232
1233         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1234         if (!tz)
1235                 return -ENOMEM;
1236
1237         tz->device = device;
1238         strcpy(tz->name, device->pnp.bus_id);
1239         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1240         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1241         acpi_driver_data(device) = tz;
1242
1243         result = acpi_thermal_get_info(tz);
1244         if (result)
1245                 goto end;
1246
1247         result = acpi_thermal_add_fs(device);
1248         if (result)
1249                 goto end;
1250
1251         init_timer(&tz->timer);
1252
1253         acpi_thermal_check(tz);
1254
1255         status = acpi_install_notify_handler(device->handle,
1256                                              ACPI_DEVICE_NOTIFY,
1257                                              acpi_thermal_notify, tz);
1258         if (ACPI_FAILURE(status)) {
1259                 result = -ENODEV;
1260                 goto end;
1261         }
1262
1263         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1264                acpi_device_name(device), acpi_device_bid(device),
1265                KELVIN_TO_CELSIUS(tz->temperature));
1266
1267       end:
1268         if (result) {
1269                 acpi_thermal_remove_fs(device);
1270                 kfree(tz);
1271         }
1272
1273         return result;
1274 }
1275
1276 static int acpi_thermal_remove(struct acpi_device *device, int type)
1277 {
1278         acpi_status status = AE_OK;
1279         struct acpi_thermal *tz = NULL;
1280
1281
1282         if (!device || !acpi_driver_data(device))
1283                 return -EINVAL;
1284
1285         tz = acpi_driver_data(device);
1286
1287         /* avoid timer adding new defer task */
1288         tz->zombie = 1;
1289         /* wait for running timer (on other CPUs) finish */
1290         del_timer_sync(&(tz->timer));
1291         /* synchronize deferred task */
1292         acpi_os_wait_events_complete(NULL);
1293         /* deferred task may reinsert timer */
1294         del_timer_sync(&(tz->timer));
1295
1296         status = acpi_remove_notify_handler(device->handle,
1297                                             ACPI_DEVICE_NOTIFY,
1298                                             acpi_thermal_notify);
1299
1300         /* Terminate policy */
1301         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1302                 tz->trips.passive.flags.enabled = 0;
1303                 acpi_thermal_passive(tz);
1304         }
1305         if (tz->trips.active[0].flags.valid
1306             && tz->trips.active[0].flags.enabled) {
1307                 tz->trips.active[0].flags.enabled = 0;
1308                 acpi_thermal_active(tz);
1309         }
1310
1311         acpi_thermal_remove_fs(device);
1312
1313         kfree(tz);
1314         return 0;
1315 }
1316
1317 static int acpi_thermal_resume(struct acpi_device *device)
1318 {
1319         struct acpi_thermal *tz = NULL;
1320         int i, j, power_state, result;
1321
1322
1323         if (!device || !acpi_driver_data(device))
1324                 return -EINVAL;
1325
1326         tz = acpi_driver_data(device);
1327
1328         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1329                 if (!(&tz->trips.active[i]))
1330                         break;
1331                 if (!tz->trips.active[i].flags.valid)
1332                         break;
1333                 tz->trips.active[i].flags.enabled = 1;
1334                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1335                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1336                             handles[j], &power_state);
1337                         if (result || (power_state != ACPI_STATE_D0)) {
1338                                 tz->trips.active[i].flags.enabled = 0;
1339                                 break;
1340                         }
1341                 }
1342                 tz->state.active |= tz->trips.active[i].flags.enabled;
1343         }
1344
1345         acpi_thermal_check(tz);
1346
1347         return AE_OK;
1348 }
1349
1350 #ifdef CONFIG_DMI
1351 static int thermal_act(struct dmi_system_id *d) {
1352
1353         if (act == 0) {
1354                 printk(KERN_NOTICE "ACPI: %s detected: "
1355                         "disabling all active thermal trip points\n", d->ident);
1356                 act = -1;
1357         }
1358         return 0;
1359 }
1360 static int thermal_tzp(struct dmi_system_id *d) {
1361
1362         if (tzp == 0) {
1363                 printk(KERN_NOTICE "ACPI: %s detected: "
1364                         "enabling thermal zone polling\n", d->ident);
1365                 tzp = 300;      /* 300 dS = 30 Seconds */
1366         }
1367         return 0;
1368 }
1369 static int thermal_psv(struct dmi_system_id *d) {
1370
1371         if (psv == 0) {
1372                 printk(KERN_NOTICE "ACPI: %s detected: "
1373                         "disabling all passive thermal trip points\n", d->ident);
1374                 psv = -1;
1375         }
1376         return 0;
1377 }
1378
1379 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1380         /*
1381          * Award BIOS on this AOpen makes thermal control almost worthless.
1382          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1383          */
1384         {
1385          .callback = thermal_act,
1386          .ident = "AOpen i915GMm-HFS",
1387          .matches = {
1388                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1389                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1390                 },
1391         },
1392         {
1393          .callback = thermal_psv,
1394          .ident = "AOpen i915GMm-HFS",
1395          .matches = {
1396                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1397                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1398                 },
1399         },
1400         {
1401          .callback = thermal_tzp,
1402          .ident = "AOpen i915GMm-HFS",
1403          .matches = {
1404                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1405                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1406                 },
1407         },
1408         {}
1409 };
1410 #endif /* CONFIG_DMI */
1411
1412 static int __init acpi_thermal_init(void)
1413 {
1414         int result = 0;
1415
1416         dmi_check_system(thermal_dmi_table);
1417
1418         if (off) {
1419                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1420                 return -ENODEV;
1421         }
1422         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1423         if (!acpi_thermal_dir)
1424                 return -ENODEV;
1425         acpi_thermal_dir->owner = THIS_MODULE;
1426
1427         result = acpi_bus_register_driver(&acpi_thermal_driver);
1428         if (result < 0) {
1429                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1430                 return -ENODEV;
1431         }
1432
1433         return 0;
1434 }
1435
1436 static void __exit acpi_thermal_exit(void)
1437 {
1438
1439         acpi_bus_unregister_driver(&acpi_thermal_driver);
1440
1441         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1442
1443         return;
1444 }
1445
1446 module_init(acpi_thermal_init);
1447 module_exit(acpi_thermal_exit);