drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/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.\n");
  81
  82 static int tzp;
  83 module_param(tzp, int, 0444);
  84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  85
  86 static int nocrt;
  87 module_param(nocrt, int, 0);
  88 MODULE_PARM_DESC(nocrt, "Set to disable action on ACPI thermal zone critical and hot trips.\n");
  89
  90 static int off;
  91 module_param(off, int, 0);
  92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.\n");
  93
  94 static int psv;
  95 module_param(psv, int, 0644);
  96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.\n");
  97
  98 static int acpi_thermal_add(struct acpi_device *device);
  99 static int acpi_thermal_remove(struct acpi_device *device, int type);
 100 static int acpi_thermal_resume(struct acpi_device *device);
 101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 106                                                const char __user *, size_t,
 107                                                loff_t *);
 108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 110                                           size_t, loff_t *);
 111
 112 static const struct acpi_device_id  thermal_device_ids[] = {
 113         {ACPI_THERMAL_HID, 0},
 114         {"", 0},
 115 };
 116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 117
 118 static struct acpi_driver acpi_thermal_driver = {
 119         .name = "thermal",
 120         .class = ACPI_THERMAL_CLASS,
 121         .ids = thermal_device_ids,
 122         .ops = {
 123                 .add = acpi_thermal_add,
 124                 .remove = acpi_thermal_remove,
 125                 .resume = acpi_thermal_resume,
 126                 },
 127 };
 128
 129 struct acpi_thermal_state {
 130         u8 critical:1;
 131         u8 hot:1;
 132         u8 passive:1;
 133         u8 active:1;
 134         u8 reserved:4;
 135         int active_index;
 136 };
 137
 138 struct acpi_thermal_state_flags {
 139         u8 valid:1;
 140         u8 enabled:1;
 141         u8 reserved:6;
 142 };
 143
 144 struct acpi_thermal_critical {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147 };
 148
 149 struct acpi_thermal_hot {
 150         struct acpi_thermal_state_flags flags;
 151         unsigned long temperature;
 152 };
 153
 154 struct acpi_thermal_passive {
 155         struct acpi_thermal_state_flags flags;
 156         unsigned long temperature;
 157         unsigned long tc1;
 158         unsigned long tc2;
 159         unsigned long tsp;
 160         struct acpi_handle_list devices;
 161 };
 162
 163 struct acpi_thermal_active {
 164         struct acpi_thermal_state_flags flags;
 165         unsigned long temperature;
 166         struct acpi_handle_list devices;
 167 };
 168
 169 struct acpi_thermal_trips {
 170         struct acpi_thermal_critical critical;
 171         struct acpi_thermal_hot hot;
 172         struct acpi_thermal_passive passive;
 173         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 174 };
 175
 176 struct acpi_thermal_flags {
 177         u8 cooling_mode:1;      /* _SCP */
 178         u8 devices:1;           /* _TZD */
 179         u8 reserved:6;
 180 };
 181
 182 struct acpi_thermal {
 183         struct acpi_device * device;
 184         acpi_bus_id name;
 185         unsigned long temperature;
 186         unsigned long last_temperature;
 187         unsigned long polling_frequency;
 188         volatile u8 zombie;
 189         struct acpi_thermal_flags flags;
 190         struct acpi_thermal_state state;
 191         struct acpi_thermal_trips trips;
 192         struct acpi_handle_list devices;
 193         struct timer_list timer;
 194 };
 195
 196 static const struct file_operations acpi_thermal_state_fops = {
 197         .open = acpi_thermal_state_open_fs,
 198         .read = seq_read,
 199         .llseek = seq_lseek,
 200         .release = single_release,
 201 };
 202
 203 static const struct file_operations acpi_thermal_temp_fops = {
 204         .open = acpi_thermal_temp_open_fs,
 205         .read = seq_read,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 static const struct file_operations acpi_thermal_trip_fops = {
 211         .open = acpi_thermal_trip_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 static const struct file_operations acpi_thermal_cooling_fops = {
 218         .open = acpi_thermal_cooling_open_fs,
 219         .read = seq_read,
 220         .write = acpi_thermal_write_cooling_mode,
 221         .llseek = seq_lseek,
 222         .release = single_release,
 223 };
 224
 225 static const struct file_operations acpi_thermal_polling_fops = {
 226         .open = acpi_thermal_polling_open_fs,
 227         .read = seq_read,
 228         .write = acpi_thermal_write_polling,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 /* --------------------------------------------------------------------------
 234                              Thermal Zone Management
 235    -------------------------------------------------------------------------- */
 236
 237 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 238 {
 239         acpi_status status = AE_OK;
 240
 241
 242         if (!tz)
 243                 return -EINVAL;
 244
 245         tz->last_temperature = tz->temperature;
 246
 247         status =
 248             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 249         if (ACPI_FAILURE(status))
 250                 return -ENODEV;
 251
 252         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 253                           tz->temperature));
 254
 255         return 0;
 256 }
 257
 258 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 259 {
 260         acpi_status status = AE_OK;
 261
 262
 263         if (!tz)
 264                 return -EINVAL;
 265
 266         status =
 267             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 268                                   &tz->polling_frequency);
 269         if (ACPI_FAILURE(status))
 270                 return -ENODEV;
 271
 272         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 273                           tz->polling_frequency));
 274
 275         return 0;
 276 }
 277
 278 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 279 {
 280
 281         if (!tz)
 282                 return -EINVAL;
 283
 284         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 285
 286         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 287                           "Polling frequency set to %lu seconds\n",
 288                           tz->polling_frequency/10));
 289
 290         return 0;
 291 }
 292
 293 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 294 {
 295         acpi_status status = AE_OK;
 296         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 297         struct acpi_object_list arg_list = { 1, &arg0 };
 298         acpi_handle handle = NULL;
 299
 300
 301         if (!tz)
 302                 return -EINVAL;
 303
 304         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 305         if (ACPI_FAILURE(status)) {
 306                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 307                 return -ENODEV;
 308         }
 309
 310         arg0.integer.value = mode;
 311
 312         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 313         if (ACPI_FAILURE(status))
 314                 return -ENODEV;
 315
 316         return 0;
 317 }
 318
 319 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 320 {
 321         acpi_status status = AE_OK;
 322         int i = 0;
 323
 324
 325         if (!tz)
 326                 return -EINVAL;
 327
 328         /* Critical Shutdown (required) */
 329
 330         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 331                                        &tz->trips.critical.temperature);
 332         if (ACPI_FAILURE(status)) {
 333                 tz->trips.critical.flags.valid = 0;
 334                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 335                 return -ENODEV;
 336         } else {
 337                 tz->trips.critical.flags.valid = 1;
 338                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 339                                   "Found critical threshold [%lu]\n",
 340                                   tz->trips.critical.temperature));
 341         }
 342
 343         /* Critical Sleep (optional) */
 344
 345         status =
 346             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 347                                   &tz->trips.hot.temperature);
 348         if (ACPI_FAILURE(status)) {
 349                 tz->trips.hot.flags.valid = 0;
 350                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 351         } else {
 352                 tz->trips.hot.flags.valid = 1;
 353                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 354                                   tz->trips.hot.temperature));
 355         }
 356
 357         /* Passive: Processors (optional) */
 358
 359         if (psv == -1) {
 360                 status = AE_SUPPORT;
 361         } else if (psv > 0) {
 362                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 363                 status = AE_OK;
 364         } else {
 365                 status = acpi_evaluate_integer(tz->device->handle,
 366                         "_PSV", NULL, &tz->trips.passive.temperature);
 367         }
 368
 369         if (ACPI_FAILURE(status)) {
 370                 tz->trips.passive.flags.valid = 0;
 371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 372         } else {
 373                 tz->trips.passive.flags.valid = 1;
 374
 375                 status =
 376                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 377                                           &tz->trips.passive.tc1);
 378                 if (ACPI_FAILURE(status))
 379                         tz->trips.passive.flags.valid = 0;
 380
 381                 status =
 382                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 383                                           &tz->trips.passive.tc2);
 384                 if (ACPI_FAILURE(status))
 385                         tz->trips.passive.flags.valid = 0;
 386
 387                 status =
 388                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 389                                           &tz->trips.passive.tsp);
 390                 if (ACPI_FAILURE(status))
 391                         tz->trips.passive.flags.valid = 0;
 392
 393                 status =
 394                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 395                                             &tz->trips.passive.devices);
 396                 if (ACPI_FAILURE(status))
 397                         tz->trips.passive.flags.valid = 0;
 398
 399                 if (!tz->trips.passive.flags.valid)
 400                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 401                 else
 402                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 403                                           "Found passive threshold [%lu]\n",
 404                                           tz->trips.passive.temperature));
 405         }
 406
 407         /* Active: Fans, etc. (optional) */
 408
 409         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 410
 411                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 412
 413                 if (act == -1)
 414                         break;  /* disable all active trip points */
 415
 416                 status = acpi_evaluate_integer(tz->device->handle,
 417                         name, NULL, &tz->trips.active[i].temperature);
 418
 419                 if (ACPI_FAILURE(status)) {
 420                         if (i == 0)     /* no active trip points */
 421                                 break;
 422                         if (act <= 0)   /* no override requested */
 423                                 break;
 424                         if (i == 1) {   /* 1 trip point */
 425                                 tz->trips.active[0].temperature =
 426                                         CELSIUS_TO_KELVIN(act);
 427                         } else {        /* multiple trips */
 428                                 /*
 429                                  * Don't allow override higher than
 430                                  * the next higher trip point
 431                                  */
 432                                 tz->trips.active[i - 1].temperature =
 433                                     (tz->trips.active[i - 2].temperature <
 434                                         CELSIUS_TO_KELVIN(act) ?
 435                                         tz->trips.active[i - 2].temperature :
 436                                         CELSIUS_TO_KELVIN(act));
 437                         }
 438                         break;
 439                 }
 440
 441                 name[2] = 'L';
 442                 status =
 443                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 444                                             &tz->trips.active[i].devices);
 445                 if (ACPI_SUCCESS(status)) {
 446                         tz->trips.active[i].flags.valid = 1;
 447                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 448                                           "Found active threshold [%d]:[%lu]\n",
 449                                           i, tz->trips.active[i].temperature));
 450                 } else
 451                         ACPI_EXCEPTION((AE_INFO, status,
 452                                         "Invalid active threshold [%d]", i));
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 459 {
 460         acpi_status status = AE_OK;
 461
 462
 463         if (!tz)
 464                 return -EINVAL;
 465
 466         status =
 467             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 468         if (ACPI_FAILURE(status))
 469                 return -ENODEV;
 470
 471         return 0;
 472 }
 473
 474 static int acpi_thermal_critical(struct acpi_thermal *tz)
 475 {
 476         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 477                 return -EINVAL;
 478
 479         if (tz->temperature >= tz->trips.critical.temperature) {
 480                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 481                 tz->trips.critical.flags.enabled = 1;
 482         } else if (tz->trips.critical.flags.enabled)
 483                 tz->trips.critical.flags.enabled = 0;
 484
 485         printk(KERN_EMERG
 486                "Critical temperature reached (%ld C), shutting down.\n",
 487                KELVIN_TO_CELSIUS(tz->temperature));
 488         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 489                                 tz->trips.critical.flags.enabled);
 490
 491         orderly_poweroff(true);
 492
 493         return 0;
 494 }
 495
 496 static int acpi_thermal_hot(struct acpi_thermal *tz)
 497 {
 498         if (!tz || !tz->trips.hot.flags.valid || nocrt)
 499                 return -EINVAL;
 500
 501         if (tz->temperature >= tz->trips.hot.temperature) {
 502                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 503                 tz->trips.hot.flags.enabled = 1;
 504         } else if (tz->trips.hot.flags.enabled)
 505                 tz->trips.hot.flags.enabled = 0;
 506
 507         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 508                                 tz->trips.hot.flags.enabled);
 509
 510         /* TBD: Call user-mode "sleep(S4)" function */
 511
 512         return 0;
 513 }
 514
 515 static void acpi_thermal_passive(struct acpi_thermal *tz)
 516 {
 517         int result = 1;
 518         struct acpi_thermal_passive *passive = NULL;
 519         int trend = 0;
 520         int i = 0;
 521
 522
 523         if (!tz || !tz->trips.passive.flags.valid)
 524                 return;
 525
 526         passive = &(tz->trips.passive);
 527
 528         /*
 529          * Above Trip?
 530          * -----------
 531          * Calculate the thermal trend (using the passive cooling equation)
 532          * and modify the performance limit for all passive cooling devices
 533          * accordingly.  Note that we assume symmetry.
 534          */
 535         if (tz->temperature >= passive->temperature) {
 536                 trend =
 537                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 538                     (passive->tc2 * (tz->temperature - passive->temperature));
 539                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 540                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 541                                   trend, passive->tc1, tz->temperature,
 542                                   tz->last_temperature, passive->tc2,
 543                                   tz->temperature, passive->temperature));
 544                 passive->flags.enabled = 1;
 545                 /* Heating up? */
 546                 if (trend > 0)
 547                         for (i = 0; i < passive->devices.count; i++)
 548                                 acpi_processor_set_thermal_limit(passive->
 549                                                                  devices.
 550                                                                  handles[i],
 551                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 552                 /* Cooling off? */
 553                 else if (trend < 0) {
 554                         for (i = 0; i < passive->devices.count; i++)
 555                                 /*
 556                                  * assume that we are on highest
 557                                  * freq/lowest thrott and can leave
 558                                  * passive mode, even in error case
 559                                  */
 560                                 if (!acpi_processor_set_thermal_limit
 561                                     (passive->devices.handles[i],
 562                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 563                                         result = 0;
 564                         /*
 565                          * Leave cooling mode, even if the temp might
 566                          * higher than trip point This is because some
 567                          * machines might have long thermal polling
 568                          * frequencies (tsp) defined. We will fall back
 569                          * into passive mode in next cycle (probably quicker)
 570                          */
 571                         if (result) {
 572                                 passive->flags.enabled = 0;
 573                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 574                                                   "Disabling passive cooling, still above threshold,"
 575                                                   " but we are cooling down\n"));
 576                         }
 577                 }
 578                 return;
 579         }
 580
 581         /*
 582          * Below Trip?
 583          * -----------
 584          * Implement passive cooling hysteresis to slowly increase performance
 585          * and avoid thrashing around the passive trip point.  Note that we
 586          * assume symmetry.
 587          */
 588         if (!passive->flags.enabled)
 589                 return;
 590         for (i = 0; i < passive->devices.count; i++)
 591                 if (!acpi_processor_set_thermal_limit
 592                     (passive->devices.handles[i],
 593                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 594                         result = 0;
 595         if (result) {
 596                 passive->flags.enabled = 0;
 597                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 598                                   "Disabling passive cooling (zone is cool)\n"));
 599         }
 600 }
 601
 602 static void acpi_thermal_active(struct acpi_thermal *tz)
 603 {
 604         int result = 0;
 605         struct acpi_thermal_active *active = NULL;
 606         int i = 0;
 607         int j = 0;
 608         unsigned long maxtemp = 0;
 609
 610
 611         if (!tz)
 612                 return;
 613
 614         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 615                 active = &(tz->trips.active[i]);
 616                 if (!active || !active->flags.valid)
 617                         break;
 618                 if (tz->temperature >= active->temperature) {
 619                         /*
 620                          * Above Threshold?
 621                          * ----------------
 622                          * If not already enabled, turn ON all cooling devices
 623                          * associated with this active threshold.
 624                          */
 625                         if (active->temperature > maxtemp)
 626                                 tz->state.active_index = i;
 627                         maxtemp = active->temperature;
 628                         if (active->flags.enabled)
 629                                 continue;
 630                         for (j = 0; j < active->devices.count; j++) {
 631                                 result =
 632                                     acpi_bus_set_power(active->devices.
 633                                                        handles[j],
 634                                                        ACPI_STATE_D0);
 635                                 if (result) {
 636                                         printk(KERN_WARNING PREFIX
 637                                                       "Unable to turn cooling device [%p] 'on'\n",
 638                                                       active->devices.
 639                                                       handles[j]);
 640                                         continue;
 641                                 }
 642                                 active->flags.enabled = 1;
 643                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 644                                                   "Cooling device [%p] now 'on'\n",
 645                                                   active->devices.handles[j]));
 646                         }
 647                         continue;
 648                 }
 649                 if (!active->flags.enabled)
 650                         continue;
 651                 /*
 652                  * Below Threshold?
 653                  * ----------------
 654                  * Turn OFF all cooling devices associated with this
 655                  * threshold.
 656                  */
 657                 for (j = 0; j < active->devices.count; j++) {
 658                         result = acpi_bus_set_power(active->devices.handles[j],
 659                                                     ACPI_STATE_D3);
 660                         if (result) {
 661                                 printk(KERN_WARNING PREFIX
 662                                               "Unable to turn cooling device [%p] 'off'\n",
 663                                               active->devices.handles[j]);
 664                                 continue;
 665                         }
 666                         active->flags.enabled = 0;
 667                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 668                                           "Cooling device [%p] now 'off'\n",
 669                                           active->devices.handles[j]));
 670                 }
 671         }
 672 }
 673
 674 static void acpi_thermal_check(void *context);
 675
 676 static void acpi_thermal_run(unsigned long data)
 677 {
 678         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 679         if (!tz->zombie)
 680                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 681 }
 682
 683 static void acpi_thermal_check(void *data)
 684 {
 685         int result = 0;
 686         struct acpi_thermal *tz = data;
 687         unsigned long sleep_time = 0;
 688         int i = 0;
 689         struct acpi_thermal_state state;
 690
 691
 692         if (!tz) {
 693                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 694                 return;
 695         }
 696
 697         state = tz->state;
 698
 699         result = acpi_thermal_get_temperature(tz);
 700         if (result)
 701                 return;
 702
 703         memset(&tz->state, 0, sizeof(tz->state));
 704
 705         /*
 706          * Check Trip Points
 707          * -----------------
 708          * Compare the current temperature to the trip point values to see
 709          * if we've entered one of the thermal policy states.  Note that
 710          * this function determines when a state is entered, but the
 711          * individual policy decides when it is exited (e.g. hysteresis).
 712          */
 713         if (tz->trips.critical.flags.valid)
 714                 state.critical |=
 715                     (tz->temperature >= tz->trips.critical.temperature);
 716         if (tz->trips.hot.flags.valid)
 717                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 718         if (tz->trips.passive.flags.valid)
 719                 state.passive |=
 720                     (tz->temperature >= tz->trips.passive.temperature);
 721         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 722                 if (tz->trips.active[i].flags.valid)
 723                         state.active |=
 724                             (tz->temperature >=
 725                              tz->trips.active[i].temperature);
 726
 727         /*
 728          * Invoke Policy
 729          * -------------
 730          * Separated from the above check to allow individual policy to
 731          * determine when to exit a given state.
 732          */
 733         if (state.critical)
 734                 acpi_thermal_critical(tz);
 735         if (state.hot)
 736                 acpi_thermal_hot(tz);
 737         if (state.passive)
 738                 acpi_thermal_passive(tz);
 739         if (state.active)
 740                 acpi_thermal_active(tz);
 741
 742         /*
 743          * Calculate State
 744          * ---------------
 745          * Again, separated from the above two to allow independent policy
 746          * decisions.
 747          */
 748         tz->state.critical = tz->trips.critical.flags.enabled;
 749         tz->state.hot = tz->trips.hot.flags.enabled;
 750         tz->state.passive = tz->trips.passive.flags.enabled;
 751         tz->state.active = 0;
 752         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 753                 tz->state.active |= tz->trips.active[i].flags.enabled;
 754
 755         /*
 756          * Calculate Sleep Time
 757          * --------------------
 758          * If we're in the passive state, use _TSP's value.  Otherwise
 759          * use the default polling frequency (e.g. _TZP).  If no polling
 760          * frequency is specified then we'll wait forever (at least until
 761          * a thermal event occurs).  Note that _TSP and _TZD values are
 762          * given in 1/10th seconds (we must covert to milliseconds).
 763          */
 764         if (tz->state.passive)
 765                 sleep_time = tz->trips.passive.tsp * 100;
 766         else if (tz->polling_frequency > 0)
 767                 sleep_time = tz->polling_frequency * 100;
 768
 769         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 770                           tz->name, tz->temperature, sleep_time));
 771
 772         /*
 773          * Schedule Next Poll
 774          * ------------------
 775          */
 776         if (!sleep_time) {
 777                 if (timer_pending(&(tz->timer)))
 778                         del_timer(&(tz->timer));
 779         } else {
 780                 if (timer_pending(&(tz->timer)))
 781                         mod_timer(&(tz->timer),
 782                                         jiffies + (HZ * sleep_time) / 1000);
 783                 else {
 784                         tz->timer.data = (unsigned long)tz;
 785                         tz->timer.function = acpi_thermal_run;
 786                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 787                         add_timer(&(tz->timer));
 788                 }
 789         }
 790
 791         return;
 792 }
 793
 794 /* --------------------------------------------------------------------------
 795                               FS Interface (/proc)
 796    -------------------------------------------------------------------------- */
 797
 798 static struct proc_dir_entry *acpi_thermal_dir;
 799
 800 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 801 {
 802         struct acpi_thermal *tz = seq->private;
 803
 804
 805         if (!tz)
 806                 goto end;
 807
 808         seq_puts(seq, "state:                   ");
 809
 810         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 811             && !tz->state.active)
 812                 seq_puts(seq, "ok\n");
 813         else {
 814                 if (tz->state.critical)
 815                         seq_puts(seq, "critical ");
 816                 if (tz->state.hot)
 817                         seq_puts(seq, "hot ");
 818                 if (tz->state.passive)
 819                         seq_puts(seq, "passive ");
 820                 if (tz->state.active)
 821                         seq_printf(seq, "active[%d]", tz->state.active_index);
 822                 seq_puts(seq, "\n");
 823         }
 824
 825       end:
 826         return 0;
 827 }
 828
 829 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 830 {
 831         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 832 }
 833
 834 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 835 {
 836         int result = 0;
 837         struct acpi_thermal *tz = seq->private;
 838
 839
 840         if (!tz)
 841                 goto end;
 842
 843         result = acpi_thermal_get_temperature(tz);
 844         if (result)
 845                 goto end;
 846
 847         seq_printf(seq, "temperature:             %ld C\n",
 848                    KELVIN_TO_CELSIUS(tz->temperature));
 849
 850       end:
 851         return 0;
 852 }
 853
 854 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 855 {
 856         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 857 }
 858
 859 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 860 {
 861         struct acpi_thermal *tz = seq->private;
 862         struct acpi_device *device;
 863         acpi_status status;
 864
 865         int i = 0;
 866         int j = 0;
 867
 868
 869         if (!tz)
 870                 goto end;
 871
 872         if (tz->trips.critical.flags.valid)
 873                 seq_printf(seq, "critical (S5):           %ld C%s",
 874                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 875                            nocrt ? " <disabled>\n" : "\n");
 876
 877         if (tz->trips.hot.flags.valid)
 878                 seq_printf(seq, "hot (S4):                %ld C%s",
 879                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 880                            nocrt ? " <disabled>\n" : "\n");
 881
 882         if (tz->trips.passive.flags.valid) {
 883                 seq_printf(seq,
 884                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 885                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 886                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 887                            tz->trips.passive.tsp);
 888                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 889                         status = acpi_bus_get_device(tz->trips.passive.devices.
 890                                                      handles[j], &device);
 891                         seq_printf(seq, "%4.4s ", status ? "" :
 892                                    acpi_device_bid(device));
 893                 }
 894                 seq_puts(seq, "\n");
 895         }
 896
 897         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 898                 if (!(tz->trips.active[i].flags.valid))
 899                         break;
 900                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 901                            i,
 902                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 903                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 904                         status = acpi_bus_get_device(tz->trips.active[i].
 905                                                      devices.handles[j],
 906                                                      &device);
 907                         seq_printf(seq, "%4.4s ", status ? "" :
 908                                    acpi_device_bid(device));
 909                 }
 910                 seq_puts(seq, "\n");
 911         }
 912
 913       end:
 914         return 0;
 915 }
 916
 917 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 918 {
 919         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 920 }
 921
 922 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 923 {
 924         struct acpi_thermal *tz = seq->private;
 925
 926
 927         if (!tz)
 928                 goto end;
 929
 930         if (!tz->flags.cooling_mode)
 931                 seq_puts(seq, "<setting not supported>\n");
 932         else
 933                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 934
 935       end:
 936         return 0;
 937 }
 938
 939 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 940 {
 941         return single_open(file, acpi_thermal_cooling_seq_show,
 942                            PDE(inode)->data);
 943 }
 944
 945 static ssize_t
 946 acpi_thermal_write_cooling_mode(struct file *file,
 947                                 const char __user * buffer,
 948                                 size_t count, loff_t * ppos)
 949 {
 950         struct seq_file *m = file->private_data;
 951         struct acpi_thermal *tz = m->private;
 952         int result = 0;
 953         char mode_string[12] = { '\0' };
 954
 955
 956         if (!tz || (count > sizeof(mode_string) - 1))
 957                 return -EINVAL;
 958
 959         if (!tz->flags.cooling_mode)
 960                 return -ENODEV;
 961
 962         if (copy_from_user(mode_string, buffer, count))
 963                 return -EFAULT;
 964
 965         mode_string[count] = '\0';
 966
 967         result = acpi_thermal_set_cooling_mode(tz,
 968                                                simple_strtoul(mode_string, NULL,
 969                                                               0));
 970         if (result)
 971                 return result;
 972
 973         acpi_thermal_check(tz);
 974
 975         return count;
 976 }
 977
 978 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
 979 {
 980         struct acpi_thermal *tz = seq->private;
 981
 982
 983         if (!tz)
 984                 goto end;
 985
 986         if (!tz->polling_frequency) {
 987                 seq_puts(seq, "<polling disabled>\n");
 988                 goto end;
 989         }
 990
 991         seq_printf(seq, "polling frequency:       %lu seconds\n",
 992                    (tz->polling_frequency / 10));
 993
 994       end:
 995         return 0;
 996 }
 997
 998 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
 999 {
1000         return single_open(file, acpi_thermal_polling_seq_show,
1001                            PDE(inode)->data);
1002 }
1003
1004 static ssize_t
1005 acpi_thermal_write_polling(struct file *file,
1006                            const char __user * buffer,
1007                            size_t count, loff_t * ppos)
1008 {
1009         struct seq_file *m = file->private_data;
1010         struct acpi_thermal *tz = m->private;
1011         int result = 0;
1012         char polling_string[12] = { '\0' };
1013         int seconds = 0;
1014
1015
1016         if (!tz || (count > sizeof(polling_string) - 1))
1017                 return -EINVAL;
1018
1019         if (copy_from_user(polling_string, buffer, count))
1020                 return -EFAULT;
1021
1022         polling_string[count] = '\0';
1023
1024         seconds = simple_strtoul(polling_string, NULL, 0);
1025
1026         result = acpi_thermal_set_polling(tz, seconds);
1027         if (result)
1028                 return result;
1029
1030         acpi_thermal_check(tz);
1031
1032         return count;
1033 }
1034
1035 static int acpi_thermal_add_fs(struct acpi_device *device)
1036 {
1037         struct proc_dir_entry *entry = NULL;
1038
1039
1040         if (!acpi_device_dir(device)) {
1041                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1042                                                      acpi_thermal_dir);
1043                 if (!acpi_device_dir(device))
1044                         return -ENODEV;
1045                 acpi_device_dir(device)->owner = THIS_MODULE;
1046         }
1047
1048         /* 'state' [R] */
1049         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1050                                   S_IRUGO, acpi_device_dir(device));
1051         if (!entry)
1052                 return -ENODEV;
1053         else {
1054                 entry->proc_fops = &acpi_thermal_state_fops;
1055                 entry->data = acpi_driver_data(device);
1056                 entry->owner = THIS_MODULE;
1057         }
1058
1059         /* 'temperature' [R] */
1060         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1061                                   S_IRUGO, acpi_device_dir(device));
1062         if (!entry)
1063                 return -ENODEV;
1064         else {
1065                 entry->proc_fops = &acpi_thermal_temp_fops;
1066                 entry->data = acpi_driver_data(device);
1067                 entry->owner = THIS_MODULE;
1068         }
1069
1070         /* 'trip_points' [R/W] */
1071         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1072                                   S_IFREG | S_IRUGO | S_IWUSR,
1073                                   acpi_device_dir(device));
1074         if (!entry)
1075                 return -ENODEV;
1076         else {
1077                 entry->proc_fops = &acpi_thermal_trip_fops;
1078                 entry->data = acpi_driver_data(device);
1079                 entry->owner = THIS_MODULE;
1080         }
1081
1082         /* 'cooling_mode' [R/W] */
1083         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1084                                   S_IFREG | S_IRUGO | S_IWUSR,
1085                                   acpi_device_dir(device));
1086         if (!entry)
1087                 return -ENODEV;
1088         else {
1089                 entry->proc_fops = &acpi_thermal_cooling_fops;
1090                 entry->data = acpi_driver_data(device);
1091                 entry->owner = THIS_MODULE;
1092         }
1093
1094         /* 'polling_frequency' [R/W] */
1095         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1096                                   S_IFREG | S_IRUGO | S_IWUSR,
1097                                   acpi_device_dir(device));
1098         if (!entry)
1099                 return -ENODEV;
1100         else {
1101                 entry->proc_fops = &acpi_thermal_polling_fops;
1102                 entry->data = acpi_driver_data(device);
1103                 entry->owner = THIS_MODULE;
1104         }
1105
1106         return 0;
1107 }
1108
1109 static int acpi_thermal_remove_fs(struct acpi_device *device)
1110 {
1111
1112         if (acpi_device_dir(device)) {
1113                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1114                                   acpi_device_dir(device));
1115                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1116                                   acpi_device_dir(device));
1117                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1118                                   acpi_device_dir(device));
1119                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1120                                   acpi_device_dir(device));
1121                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1122                                   acpi_device_dir(device));
1123                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1124                 acpi_device_dir(device) = NULL;
1125         }
1126
1127         return 0;
1128 }
1129
1130 /* --------------------------------------------------------------------------
1131                                  Driver Interface
1132    -------------------------------------------------------------------------- */
1133
1134 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1135 {
1136         struct acpi_thermal *tz = data;
1137         struct acpi_device *device = NULL;
1138
1139
1140         if (!tz)
1141                 return;
1142
1143         device = tz->device;
1144
1145         switch (event) {
1146         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1147                 acpi_thermal_check(tz);
1148                 break;
1149         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1150                 acpi_thermal_get_trip_points(tz);
1151                 acpi_thermal_check(tz);
1152                 acpi_bus_generate_event(device, event, 0);
1153                 break;
1154         case ACPI_THERMAL_NOTIFY_DEVICES:
1155                 if (tz->flags.devices)
1156                         acpi_thermal_get_devices(tz);
1157                 acpi_bus_generate_event(device, event, 0);
1158                 break;
1159         default:
1160                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1161                                   "Unsupported event [0x%x]\n", event));
1162                 break;
1163         }
1164
1165         return;
1166 }
1167
1168 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1169 {
1170         int result = 0;
1171
1172
1173         if (!tz)
1174                 return -EINVAL;
1175
1176         /* Get temperature [_TMP] (required) */
1177         result = acpi_thermal_get_temperature(tz);
1178         if (result)
1179                 return result;
1180
1181         /* Get trip points [_CRT, _PSV, etc.] (required) */
1182         result = acpi_thermal_get_trip_points(tz);
1183         if (result)
1184                 return result;
1185
1186         /* Set the cooling mode [_SCP] to active cooling (default) */
1187         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1188         if (!result)
1189                 tz->flags.cooling_mode = 1;
1190
1191         /* Get default polling frequency [_TZP] (optional) */
1192         if (tzp)
1193                 tz->polling_frequency = tzp;
1194         else
1195                 acpi_thermal_get_polling_frequency(tz);
1196
1197         /* Get devices in this thermal zone [_TZD] (optional) */
1198         result = acpi_thermal_get_devices(tz);
1199         if (!result)
1200                 tz->flags.devices = 1;
1201
1202         return 0;
1203 }
1204
1205 static int acpi_thermal_add(struct acpi_device *device)
1206 {
1207         int result = 0;
1208         acpi_status status = AE_OK;
1209         struct acpi_thermal *tz = NULL;
1210
1211
1212         if (!device)
1213                 return -EINVAL;
1214
1215         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1216         if (!tz)
1217                 return -ENOMEM;
1218
1219         tz->device = device;
1220         strcpy(tz->name, device->pnp.bus_id);
1221         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1222         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1223         acpi_driver_data(device) = tz;
1224
1225         result = acpi_thermal_get_info(tz);
1226         if (result)
1227                 goto end;
1228
1229         result = acpi_thermal_add_fs(device);
1230         if (result)
1231                 goto end;
1232
1233         init_timer(&tz->timer);
1234
1235         acpi_thermal_check(tz);
1236
1237         status = acpi_install_notify_handler(device->handle,
1238                                              ACPI_DEVICE_NOTIFY,
1239                                              acpi_thermal_notify, tz);
1240         if (ACPI_FAILURE(status)) {
1241                 result = -ENODEV;
1242                 goto end;
1243         }
1244
1245         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1246                acpi_device_name(device), acpi_device_bid(device),
1247                KELVIN_TO_CELSIUS(tz->temperature));
1248
1249       end:
1250         if (result) {
1251                 acpi_thermal_remove_fs(device);
1252                 kfree(tz);
1253         }
1254
1255         return result;
1256 }
1257
1258 static int acpi_thermal_remove(struct acpi_device *device, int type)
1259 {
1260         acpi_status status = AE_OK;
1261         struct acpi_thermal *tz = NULL;
1262
1263
1264         if (!device || !acpi_driver_data(device))
1265                 return -EINVAL;
1266
1267         tz = acpi_driver_data(device);
1268
1269         /* avoid timer adding new defer task */
1270         tz->zombie = 1;
1271         /* wait for running timer (on other CPUs) finish */
1272         del_timer_sync(&(tz->timer));
1273         /* synchronize deferred task */
1274         acpi_os_wait_events_complete(NULL);
1275         /* deferred task may reinsert timer */
1276         del_timer_sync(&(tz->timer));
1277
1278         status = acpi_remove_notify_handler(device->handle,
1279                                             ACPI_DEVICE_NOTIFY,
1280                                             acpi_thermal_notify);
1281
1282         /* Terminate policy */
1283         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1284                 tz->trips.passive.flags.enabled = 0;
1285                 acpi_thermal_passive(tz);
1286         }
1287         if (tz->trips.active[0].flags.valid
1288             && tz->trips.active[0].flags.enabled) {
1289                 tz->trips.active[0].flags.enabled = 0;
1290                 acpi_thermal_active(tz);
1291         }
1292
1293         acpi_thermal_remove_fs(device);
1294
1295         kfree(tz);
1296         return 0;
1297 }
1298
1299 static int acpi_thermal_resume(struct acpi_device *device)
1300 {
1301         struct acpi_thermal *tz = NULL;
1302         int i, j, power_state, result;
1303
1304
1305         if (!device || !acpi_driver_data(device))
1306                 return -EINVAL;
1307
1308         tz = acpi_driver_data(device);
1309
1310         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1311                 if (!(&tz->trips.active[i]))
1312                         break;
1313                 if (!tz->trips.active[i].flags.valid)
1314                         break;
1315                 tz->trips.active[i].flags.enabled = 1;
1316                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1317                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1318                             handles[j], &power_state);
1319                         if (result || (power_state != ACPI_STATE_D0)) {
1320                                 tz->trips.active[i].flags.enabled = 0;
1321                                 break;
1322                         }
1323                 }
1324                 tz->state.active |= tz->trips.active[i].flags.enabled;
1325         }
1326
1327         acpi_thermal_check(tz);
1328
1329         return AE_OK;
1330 }
1331
1332 #ifdef CONFIG_DMI
1333 static int thermal_act(struct dmi_system_id *d) {
1334
1335         if (act == 0) {
1336                 printk(KERN_NOTICE "ACPI: %s detected: "
1337                         "disabling all active thermal trip points\n", d->ident);
1338                 act = -1;
1339         }
1340         return 0;
1341 }
1342 static int thermal_tzp(struct dmi_system_id *d) {
1343
1344         if (tzp == 0) {
1345                 printk(KERN_NOTICE "ACPI: %s detected: "
1346                         "enabling thermal zone polling\n", d->ident);
1347                 tzp = 300;      /* 300 dS = 30 Seconds */
1348         }
1349         return 0;
1350 }
1351 static int thermal_psv(struct dmi_system_id *d) {
1352
1353         if (psv == 0) {
1354                 printk(KERN_NOTICE "ACPI: %s detected: "
1355                         "disabling all passive thermal trip points\n", d->ident);
1356                 psv = -1;
1357         }
1358         return 0;
1359 }
1360
1361 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1362         /*
1363          * Award BIOS on this AOpen makes thermal control almost worthless.
1364          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1365          */
1366         {
1367          .callback = thermal_act,
1368          .ident = "AOpen i915GMm-HFS",
1369          .matches = {
1370                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1371                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1372                 },
1373         },
1374         {
1375          .callback = thermal_psv,
1376          .ident = "AOpen i915GMm-HFS",
1377          .matches = {
1378                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1379                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1380                 },
1381         },
1382         {
1383          .callback = thermal_tzp,
1384          .ident = "AOpen i915GMm-HFS",
1385          .matches = {
1386                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1387                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1388                 },
1389         },
1390         {}
1391 };
1392 #endif /* CONFIG_DMI */
1393
1394 static int __init acpi_thermal_init(void)
1395 {
1396         int result = 0;
1397
1398         dmi_check_system(thermal_dmi_table);
1399
1400         if (off) {
1401                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1402                 return -ENODEV;
1403         }
1404         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1405         if (!acpi_thermal_dir)
1406                 return -ENODEV;
1407         acpi_thermal_dir->owner = THIS_MODULE;
1408
1409         result = acpi_bus_register_driver(&acpi_thermal_driver);
1410         if (result < 0) {
1411                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1412                 return -ENODEV;
1413         }
1414
1415         return 0;
1416 }
1417
1418 static void __exit acpi_thermal_exit(void)
1419 {
1420
1421         acpi_bus_unregister_driver(&acpi_thermal_driver);
1422
1423         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1424
1425         return;
1426 }
1427
1428 module_init(acpi_thermal_init);
1429 module_exit(acpi_thermal_exit);