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/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/timer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <acpi/acpi_bus.h>
  47 #include <acpi/acpi_drivers.h>
  48
  49 #define ACPI_THERMAL_COMPONENT          0x04000000
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  68 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  69
  70 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  71 ACPI_MODULE_NAME("thermal");
  72
  73 MODULE_AUTHOR("Paul Diefenbaugh");
  74 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  75 MODULE_LICENSE("GPL");
  76
  77 static int act;
  78 module_param(act, int, 0644);
  79 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.\n");
  80
  81 static int tzp;
  82 module_param(tzp, int, 0444);
  83 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  84
  85 static int nocrt;
  86 module_param(nocrt, int, 0);
  87 MODULE_PARM_DESC(nocrt, "Set to disable action on ACPI thermal zone critical and hot trips.\n");
  88
  89 static int off;
  90 module_param(off, int, 0);
  91 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.\n");
  92
  93 static int psv;
  94 module_param(psv, int, 0644);
  95 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.\n");
  96
  97 static int acpi_thermal_add(struct acpi_device *device);
  98 static int acpi_thermal_remove(struct acpi_device *device, int type);
  99 static int acpi_thermal_resume(struct acpi_device *device);
 100 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 101 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 102 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 104 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 105                                                const char __user *, size_t,
 106                                                loff_t *);
 107 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 108 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 109                                           size_t, loff_t *);
 110
 111 static const struct acpi_device_id  thermal_device_ids[] = {
 112         {ACPI_THERMAL_HID, 0},
 113         {"", 0},
 114 };
 115 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 116
 117 static struct acpi_driver acpi_thermal_driver = {
 118         .name = "thermal",
 119         .class = ACPI_THERMAL_CLASS,
 120         .ids = thermal_device_ids,
 121         .ops = {
 122                 .add = acpi_thermal_add,
 123                 .remove = acpi_thermal_remove,
 124                 .resume = acpi_thermal_resume,
 125                 },
 126 };
 127
 128 struct acpi_thermal_state {
 129         u8 critical:1;
 130         u8 hot:1;
 131         u8 passive:1;
 132         u8 active:1;
 133         u8 reserved:4;
 134         int active_index;
 135 };
 136
 137 struct acpi_thermal_state_flags {
 138         u8 valid:1;
 139         u8 enabled:1;
 140         u8 reserved:6;
 141 };
 142
 143 struct acpi_thermal_critical {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146 };
 147
 148 struct acpi_thermal_hot {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_passive {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156         unsigned long tc1;
 157         unsigned long tc2;
 158         unsigned long tsp;
 159         struct acpi_handle_list devices;
 160 };
 161
 162 struct acpi_thermal_active {
 163         struct acpi_thermal_state_flags flags;
 164         unsigned long temperature;
 165         struct acpi_handle_list devices;
 166 };
 167
 168 struct acpi_thermal_trips {
 169         struct acpi_thermal_critical critical;
 170         struct acpi_thermal_hot hot;
 171         struct acpi_thermal_passive passive;
 172         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 173 };
 174
 175 struct acpi_thermal_flags {
 176         u8 cooling_mode:1;      /* _SCP */
 177         u8 devices:1;           /* _TZD */
 178         u8 reserved:6;
 179 };
 180
 181 struct acpi_thermal {
 182         struct acpi_device * device;
 183         acpi_bus_id name;
 184         unsigned long temperature;
 185         unsigned long last_temperature;
 186         unsigned long polling_frequency;
 187         volatile u8 zombie;
 188         struct acpi_thermal_flags flags;
 189         struct acpi_thermal_state state;
 190         struct acpi_thermal_trips trips;
 191         struct acpi_handle_list devices;
 192         struct timer_list timer;
 193 };
 194
 195 static const struct file_operations acpi_thermal_state_fops = {
 196         .open = acpi_thermal_state_open_fs,
 197         .read = seq_read,
 198         .llseek = seq_lseek,
 199         .release = single_release,
 200 };
 201
 202 static const struct file_operations acpi_thermal_temp_fops = {
 203         .open = acpi_thermal_temp_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static const struct file_operations acpi_thermal_trip_fops = {
 210         .open = acpi_thermal_trip_open_fs,
 211         .read = seq_read,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 static const struct file_operations acpi_thermal_cooling_fops = {
 217         .open = acpi_thermal_cooling_open_fs,
 218         .read = seq_read,
 219         .write = acpi_thermal_write_cooling_mode,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static const struct file_operations acpi_thermal_polling_fops = {
 225         .open = acpi_thermal_polling_open_fs,
 226         .read = seq_read,
 227         .write = acpi_thermal_write_polling,
 228         .llseek = seq_lseek,
 229         .release = single_release,
 230 };
 231
 232 /* --------------------------------------------------------------------------
 233                              Thermal Zone Management
 234    -------------------------------------------------------------------------- */
 235
 236 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 237 {
 238         acpi_status status = AE_OK;
 239
 240
 241         if (!tz)
 242                 return -EINVAL;
 243
 244         tz->last_temperature = tz->temperature;
 245
 246         status =
 247             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 248         if (ACPI_FAILURE(status))
 249                 return -ENODEV;
 250
 251         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 252                           tz->temperature));
 253
 254         return 0;
 255 }
 256
 257 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 258 {
 259         acpi_status status = AE_OK;
 260
 261
 262         if (!tz)
 263                 return -EINVAL;
 264
 265         status =
 266             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 267                                   &tz->polling_frequency);
 268         if (ACPI_FAILURE(status))
 269                 return -ENODEV;
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 272                           tz->polling_frequency));
 273
 274         return 0;
 275 }
 276
 277 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 278 {
 279
 280         if (!tz)
 281                 return -EINVAL;
 282
 283         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 284
 285         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 286                           "Polling frequency set to %lu seconds\n",
 287                           tz->polling_frequency/10));
 288
 289         return 0;
 290 }
 291
 292 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 293 {
 294         acpi_status status = AE_OK;
 295         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 296         struct acpi_object_list arg_list = { 1, &arg0 };
 297         acpi_handle handle = NULL;
 298
 299
 300         if (!tz)
 301                 return -EINVAL;
 302
 303         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 304         if (ACPI_FAILURE(status)) {
 305                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 306                 return -ENODEV;
 307         }
 308
 309         arg0.integer.value = mode;
 310
 311         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 312         if (ACPI_FAILURE(status))
 313                 return -ENODEV;
 314
 315         return 0;
 316 }
 317
 318 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 319 {
 320         acpi_status status = AE_OK;
 321         int i = 0;
 322
 323
 324         if (!tz)
 325                 return -EINVAL;
 326
 327         /* Critical Shutdown (required) */
 328
 329         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 330                                        &tz->trips.critical.temperature);
 331         if (ACPI_FAILURE(status)) {
 332                 tz->trips.critical.flags.valid = 0;
 333                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 334                 return -ENODEV;
 335         } else {
 336                 tz->trips.critical.flags.valid = 1;
 337                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 338                                   "Found critical threshold [%lu]\n",
 339                                   tz->trips.critical.temperature));
 340         }
 341
 342         /* Critical Sleep (optional) */
 343
 344         status =
 345             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 346                                   &tz->trips.hot.temperature);
 347         if (ACPI_FAILURE(status)) {
 348                 tz->trips.hot.flags.valid = 0;
 349                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 350         } else {
 351                 tz->trips.hot.flags.valid = 1;
 352                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 353                                   tz->trips.hot.temperature));
 354         }
 355
 356         /* Passive: Processors (optional) */
 357
 358         if (psv == -1) {
 359                 status = AE_SUPPORT;
 360         } else if (psv > 0) {
 361                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 362                 status = AE_OK;
 363         } else {
 364                 status = acpi_evaluate_integer(tz->device->handle,
 365                         "_PSV", NULL, &tz->trips.passive.temperature);
 366         }
 367
 368         if (ACPI_FAILURE(status)) {
 369                 tz->trips.passive.flags.valid = 0;
 370                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 371         } else {
 372                 tz->trips.passive.flags.valid = 1;
 373
 374                 status =
 375                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 376                                           &tz->trips.passive.tc1);
 377                 if (ACPI_FAILURE(status))
 378                         tz->trips.passive.flags.valid = 0;
 379
 380                 status =
 381                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 382                                           &tz->trips.passive.tc2);
 383                 if (ACPI_FAILURE(status))
 384                         tz->trips.passive.flags.valid = 0;
 385
 386                 status =
 387                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 388                                           &tz->trips.passive.tsp);
 389                 if (ACPI_FAILURE(status))
 390                         tz->trips.passive.flags.valid = 0;
 391
 392                 status =
 393                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 394                                             &tz->trips.passive.devices);
 395                 if (ACPI_FAILURE(status))
 396                         tz->trips.passive.flags.valid = 0;
 397
 398                 if (!tz->trips.passive.flags.valid)
 399                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 400                 else
 401                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 402                                           "Found passive threshold [%lu]\n",
 403                                           tz->trips.passive.temperature));
 404         }
 405
 406         /* Active: Fans, etc. (optional) */
 407
 408         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 409
 410                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 411
 412                 if (act == -1)
 413                         break;  /* disable all active trip points */
 414
 415                 status = acpi_evaluate_integer(tz->device->handle,
 416                         name, NULL, &tz->trips.active[i].temperature);
 417
 418                 if (ACPI_FAILURE(status)) {
 419                         if (i == 0)     /* no active trip points */
 420                                 break;
 421                         if (act <= 0)   /* no override requested */
 422                                 break;
 423                         if (i == 1) {   /* 1 trip point */
 424                                 tz->trips.active[0].temperature =
 425                                         CELSIUS_TO_KELVIN(act);
 426                         } else {        /* multiple trips */
 427                                 /*
 428                                  * Don't allow override higher than
 429                                  * the next higher trip point
 430                                  */
 431                                 tz->trips.active[i - 1].temperature =
 432                                     (tz->trips.active[i - 2].temperature <
 433                                         CELSIUS_TO_KELVIN(act) ?
 434                                         tz->trips.active[i - 2].temperature :
 435                                         CELSIUS_TO_KELVIN(act));
 436                         }
 437                         break;
 438                 }
 439
 440                 name[2] = 'L';
 441                 status =
 442                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 443                                             &tz->trips.active[i].devices);
 444                 if (ACPI_SUCCESS(status)) {
 445                         tz->trips.active[i].flags.valid = 1;
 446                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 447                                           "Found active threshold [%d]:[%lu]\n",
 448                                           i, tz->trips.active[i].temperature));
 449                 } else
 450                         ACPI_EXCEPTION((AE_INFO, status,
 451                                         "Invalid active threshold [%d]", i));
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 458 {
 459         acpi_status status = AE_OK;
 460
 461
 462         if (!tz)
 463                 return -EINVAL;
 464
 465         status =
 466             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 467         if (ACPI_FAILURE(status))
 468                 return -ENODEV;
 469
 470         return 0;
 471 }
 472
 473 static int acpi_thermal_critical(struct acpi_thermal *tz)
 474 {
 475         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 476                 return -EINVAL;
 477
 478         if (tz->temperature >= tz->trips.critical.temperature) {
 479                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 480                 tz->trips.critical.flags.enabled = 1;
 481         } else if (tz->trips.critical.flags.enabled)
 482                 tz->trips.critical.flags.enabled = 0;
 483
 484         printk(KERN_EMERG
 485                "Critical temperature reached (%ld C), shutting down.\n",
 486                KELVIN_TO_CELSIUS(tz->temperature));
 487         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 488                                 tz->trips.critical.flags.enabled);
 489
 490         orderly_poweroff(true);
 491
 492         return 0;
 493 }
 494
 495 static int acpi_thermal_hot(struct acpi_thermal *tz)
 496 {
 497         if (!tz || !tz->trips.hot.flags.valid || nocrt)
 498                 return -EINVAL;
 499
 500         if (tz->temperature >= tz->trips.hot.temperature) {
 501                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 502                 tz->trips.hot.flags.enabled = 1;
 503         } else if (tz->trips.hot.flags.enabled)
 504                 tz->trips.hot.flags.enabled = 0;
 505
 506         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 507                                 tz->trips.hot.flags.enabled);
 508
 509         /* TBD: Call user-mode "sleep(S4)" function */
 510
 511         return 0;
 512 }
 513
 514 static void acpi_thermal_passive(struct acpi_thermal *tz)
 515 {
 516         int result = 1;
 517         struct acpi_thermal_passive *passive = NULL;
 518         int trend = 0;
 519         int i = 0;
 520
 521
 522         if (!tz || !tz->trips.passive.flags.valid)
 523                 return;
 524
 525         passive = &(tz->trips.passive);
 526
 527         /*
 528          * Above Trip?
 529          * -----------
 530          * Calculate the thermal trend (using the passive cooling equation)
 531          * and modify the performance limit for all passive cooling devices
 532          * accordingly.  Note that we assume symmetry.
 533          */
 534         if (tz->temperature >= passive->temperature) {
 535                 trend =
 536                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 537                     (passive->tc2 * (tz->temperature - passive->temperature));
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 540                                   trend, passive->tc1, tz->temperature,
 541                                   tz->last_temperature, passive->tc2,
 542                                   tz->temperature, passive->temperature));
 543                 passive->flags.enabled = 1;
 544                 /* Heating up? */
 545                 if (trend > 0)
 546                         for (i = 0; i < passive->devices.count; i++)
 547                                 acpi_processor_set_thermal_limit(passive->
 548                                                                  devices.
 549                                                                  handles[i],
 550                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 551                 /* Cooling off? */
 552                 else if (trend < 0) {
 553                         for (i = 0; i < passive->devices.count; i++)
 554                                 /*
 555                                  * assume that we are on highest
 556                                  * freq/lowest thrott and can leave
 557                                  * passive mode, even in error case
 558                                  */
 559                                 if (!acpi_processor_set_thermal_limit
 560                                     (passive->devices.handles[i],
 561                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 562                                         result = 0;
 563                         /*
 564                          * Leave cooling mode, even if the temp might
 565                          * higher than trip point This is because some
 566                          * machines might have long thermal polling
 567                          * frequencies (tsp) defined. We will fall back
 568                          * into passive mode in next cycle (probably quicker)
 569                          */
 570                         if (result) {
 571                                 passive->flags.enabled = 0;
 572                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 573                                                   "Disabling passive cooling, still above threshold,"
 574                                                   " but we are cooling down\n"));
 575                         }
 576                 }
 577                 return;
 578         }
 579
 580         /*
 581          * Below Trip?
 582          * -----------
 583          * Implement passive cooling hysteresis to slowly increase performance
 584          * and avoid thrashing around the passive trip point.  Note that we
 585          * assume symmetry.
 586          */
 587         if (!passive->flags.enabled)
 588                 return;
 589         for (i = 0; i < passive->devices.count; i++)
 590                 if (!acpi_processor_set_thermal_limit
 591                     (passive->devices.handles[i],
 592                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 593                         result = 0;
 594         if (result) {
 595                 passive->flags.enabled = 0;
 596                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 597                                   "Disabling passive cooling (zone is cool)\n"));
 598         }
 599 }
 600
 601 static void acpi_thermal_active(struct acpi_thermal *tz)
 602 {
 603         int result = 0;
 604         struct acpi_thermal_active *active = NULL;
 605         int i = 0;
 606         int j = 0;
 607         unsigned long maxtemp = 0;
 608
 609
 610         if (!tz)
 611                 return;
 612
 613         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 614                 active = &(tz->trips.active[i]);
 615                 if (!active || !active->flags.valid)
 616                         break;
 617                 if (tz->temperature >= active->temperature) {
 618                         /*
 619                          * Above Threshold?
 620                          * ----------------
 621                          * If not already enabled, turn ON all cooling devices
 622                          * associated with this active threshold.
 623                          */
 624                         if (active->temperature > maxtemp)
 625                                 tz->state.active_index = i;
 626                         maxtemp = active->temperature;
 627                         if (active->flags.enabled)
 628                                 continue;
 629                         for (j = 0; j < active->devices.count; j++) {
 630                                 result =
 631                                     acpi_bus_set_power(active->devices.
 632                                                        handles[j],
 633                                                        ACPI_STATE_D0);
 634                                 if (result) {
 635                                         printk(KERN_WARNING PREFIX
 636                                                       "Unable to turn cooling device [%p] 'on'\n",
 637                                                       active->devices.
 638                                                       handles[j]);
 639                                         continue;
 640                                 }
 641                                 active->flags.enabled = 1;
 642                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 643                                                   "Cooling device [%p] now 'on'\n",
 644                                                   active->devices.handles[j]));
 645                         }
 646                         continue;
 647                 }
 648                 if (!active->flags.enabled)
 649                         continue;
 650                 /*
 651                  * Below Threshold?
 652                  * ----------------
 653                  * Turn OFF all cooling devices associated with this
 654                  * threshold.
 655                  */
 656                 for (j = 0; j < active->devices.count; j++) {
 657                         result = acpi_bus_set_power(active->devices.handles[j],
 658                                                     ACPI_STATE_D3);
 659                         if (result) {
 660                                 printk(KERN_WARNING PREFIX
 661                                               "Unable to turn cooling device [%p] 'off'\n",
 662                                               active->devices.handles[j]);
 663                                 continue;
 664                         }
 665                         active->flags.enabled = 0;
 666                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 667                                           "Cooling device [%p] now 'off'\n",
 668                                           active->devices.handles[j]));
 669                 }
 670         }
 671 }
 672
 673 static void acpi_thermal_check(void *context);
 674
 675 static void acpi_thermal_run(unsigned long data)
 676 {
 677         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 678         if (!tz->zombie)
 679                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 680 }
 681
 682 static void acpi_thermal_check(void *data)
 683 {
 684         int result = 0;
 685         struct acpi_thermal *tz = data;
 686         unsigned long sleep_time = 0;
 687         int i = 0;
 688         struct acpi_thermal_state state;
 689
 690
 691         if (!tz) {
 692                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 693                 return;
 694         }
 695
 696         state = tz->state;
 697
 698         result = acpi_thermal_get_temperature(tz);
 699         if (result)
 700                 return;
 701
 702         memset(&tz->state, 0, sizeof(tz->state));
 703
 704         /*
 705          * Check Trip Points
 706          * -----------------
 707          * Compare the current temperature to the trip point values to see
 708          * if we've entered one of the thermal policy states.  Note that
 709          * this function determines when a state is entered, but the
 710          * individual policy decides when it is exited (e.g. hysteresis).
 711          */
 712         if (tz->trips.critical.flags.valid)
 713                 state.critical |=
 714                     (tz->temperature >= tz->trips.critical.temperature);
 715         if (tz->trips.hot.flags.valid)
 716                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 717         if (tz->trips.passive.flags.valid)
 718                 state.passive |=
 719                     (tz->temperature >= tz->trips.passive.temperature);
 720         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 721                 if (tz->trips.active[i].flags.valid)
 722                         state.active |=
 723                             (tz->temperature >=
 724                              tz->trips.active[i].temperature);
 725
 726         /*
 727          * Invoke Policy
 728          * -------------
 729          * Separated from the above check to allow individual policy to
 730          * determine when to exit a given state.
 731          */
 732         if (state.critical)
 733                 acpi_thermal_critical(tz);
 734         if (state.hot)
 735                 acpi_thermal_hot(tz);
 736         if (state.passive)
 737                 acpi_thermal_passive(tz);
 738         if (state.active)
 739                 acpi_thermal_active(tz);
 740
 741         /*
 742          * Calculate State
 743          * ---------------
 744          * Again, separated from the above two to allow independent policy
 745          * decisions.
 746          */
 747         tz->state.critical = tz->trips.critical.flags.enabled;
 748         tz->state.hot = tz->trips.hot.flags.enabled;
 749         tz->state.passive = tz->trips.passive.flags.enabled;
 750         tz->state.active = 0;
 751         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 752                 tz->state.active |= tz->trips.active[i].flags.enabled;
 753
 754         /*
 755          * Calculate Sleep Time
 756          * --------------------
 757          * If we're in the passive state, use _TSP's value.  Otherwise
 758          * use the default polling frequency (e.g. _TZP).  If no polling
 759          * frequency is specified then we'll wait forever (at least until
 760          * a thermal event occurs).  Note that _TSP and _TZD values are
 761          * given in 1/10th seconds (we must covert to milliseconds).
 762          */
 763         if (tz->state.passive)
 764                 sleep_time = tz->trips.passive.tsp * 100;
 765         else if (tz->polling_frequency > 0)
 766                 sleep_time = tz->polling_frequency * 100;
 767
 768         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 769                           tz->name, tz->temperature, sleep_time));
 770
 771         /*
 772          * Schedule Next Poll
 773          * ------------------
 774          */
 775         if (!sleep_time) {
 776                 if (timer_pending(&(tz->timer)))
 777                         del_timer(&(tz->timer));
 778         } else {
 779                 if (timer_pending(&(tz->timer)))
 780                         mod_timer(&(tz->timer),
 781                                         jiffies + (HZ * sleep_time) / 1000);
 782                 else {
 783                         tz->timer.data = (unsigned long)tz;
 784                         tz->timer.function = acpi_thermal_run;
 785                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 786                         add_timer(&(tz->timer));
 787                 }
 788         }
 789
 790         return;
 791 }
 792
 793 /* --------------------------------------------------------------------------
 794                               FS Interface (/proc)
 795    -------------------------------------------------------------------------- */
 796
 797 static struct proc_dir_entry *acpi_thermal_dir;
 798
 799 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 800 {
 801         struct acpi_thermal *tz = seq->private;
 802
 803
 804         if (!tz)
 805                 goto end;
 806
 807         seq_puts(seq, "state:                   ");
 808
 809         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 810             && !tz->state.active)
 811                 seq_puts(seq, "ok\n");
 812         else {
 813                 if (tz->state.critical)
 814                         seq_puts(seq, "critical ");
 815                 if (tz->state.hot)
 816                         seq_puts(seq, "hot ");
 817                 if (tz->state.passive)
 818                         seq_puts(seq, "passive ");
 819                 if (tz->state.active)
 820                         seq_printf(seq, "active[%d]", tz->state.active_index);
 821                 seq_puts(seq, "\n");
 822         }
 823
 824       end:
 825         return 0;
 826 }
 827
 828 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 829 {
 830         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 831 }
 832
 833 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 834 {
 835         int result = 0;
 836         struct acpi_thermal *tz = seq->private;
 837
 838
 839         if (!tz)
 840                 goto end;
 841
 842         result = acpi_thermal_get_temperature(tz);
 843         if (result)
 844                 goto end;
 845
 846         seq_printf(seq, "temperature:             %ld C\n",
 847                    KELVIN_TO_CELSIUS(tz->temperature));
 848
 849       end:
 850         return 0;
 851 }
 852
 853 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 854 {
 855         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 856 }
 857
 858 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 859 {
 860         struct acpi_thermal *tz = seq->private;
 861         struct acpi_device *device;
 862         acpi_status status;
 863
 864         int i = 0;
 865         int j = 0;
 866
 867
 868         if (!tz)
 869                 goto end;
 870
 871         if (tz->trips.critical.flags.valid)
 872                 seq_printf(seq, "critical (S5):           %ld C%s",
 873                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 874                            nocrt ? " <disabled>\n" : "\n");
 875
 876         if (tz->trips.hot.flags.valid)
 877                 seq_printf(seq, "hot (S4):                %ld C%s",
 878                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 879                            nocrt ? " <disabled>\n" : "\n");
 880
 881         if (tz->trips.passive.flags.valid) {
 882                 seq_printf(seq,
 883                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 884                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 885                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 886                            tz->trips.passive.tsp);
 887                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 888                         status = acpi_bus_get_device(tz->trips.passive.devices.
 889                                                      handles[j], &device);
 890                         seq_printf(seq, "%4.4s ", status ? "" :
 891                                    acpi_device_bid(device));
 892                 }
 893                 seq_puts(seq, "\n");
 894         }
 895
 896         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 897                 if (!(tz->trips.active[i].flags.valid))
 898                         break;
 899                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 900                            i,
 901                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 902                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 903                         status = acpi_bus_get_device(tz->trips.active[i].
 904                                                      devices.handles[j],
 905                                                      &device);
 906                         seq_printf(seq, "%4.4s ", status ? "" :
 907                                    acpi_device_bid(device));
 908                 }
 909                 seq_puts(seq, "\n");
 910         }
 911
 912       end:
 913         return 0;
 914 }
 915
 916 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 917 {
 918         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 919 }
 920
 921 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 922 {
 923         struct acpi_thermal *tz = seq->private;
 924
 925
 926         if (!tz)
 927                 goto end;
 928
 929         if (!tz->flags.cooling_mode)
 930                 seq_puts(seq, "<setting not supported>\n");
 931         else
 932                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 933
 934       end:
 935         return 0;
 936 }
 937
 938 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 939 {
 940         return single_open(file, acpi_thermal_cooling_seq_show,
 941                            PDE(inode)->data);
 942 }
 943
 944 static ssize_t
 945 acpi_thermal_write_cooling_mode(struct file *file,
 946                                 const char __user * buffer,
 947                                 size_t count, loff_t * ppos)
 948 {
 949         struct seq_file *m = file->private_data;
 950         struct acpi_thermal *tz = m->private;
 951         int result = 0;
 952         char mode_string[12] = { '\0' };
 953
 954
 955         if (!tz || (count > sizeof(mode_string) - 1))
 956                 return -EINVAL;
 957
 958         if (!tz->flags.cooling_mode)
 959                 return -ENODEV;
 960
 961         if (copy_from_user(mode_string, buffer, count))
 962                 return -EFAULT;
 963
 964         mode_string[count] = '\0';
 965
 966         result = acpi_thermal_set_cooling_mode(tz,
 967                                                simple_strtoul(mode_string, NULL,
 968                                                               0));
 969         if (result)
 970                 return result;
 971
 972         acpi_thermal_check(tz);
 973
 974         return count;
 975 }
 976
 977 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
 978 {
 979         struct acpi_thermal *tz = seq->private;
 980
 981
 982         if (!tz)
 983                 goto end;
 984
 985         if (!tz->polling_frequency) {
 986                 seq_puts(seq, "<polling disabled>\n");
 987                 goto end;
 988         }
 989
 990         seq_printf(seq, "polling frequency:       %lu seconds\n",
 991                    (tz->polling_frequency / 10));
 992
 993       end:
 994         return 0;
 995 }
 996
 997 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
 998 {
 999         return single_open(file, acpi_thermal_polling_seq_show,
1000                            PDE(inode)->data);
1001 }
1002
1003 static ssize_t
1004 acpi_thermal_write_polling(struct file *file,
1005                            const char __user * buffer,
1006                            size_t count, loff_t * ppos)
1007 {
1008         struct seq_file *m = file->private_data;
1009         struct acpi_thermal *tz = m->private;
1010         int result = 0;
1011         char polling_string[12] = { '\0' };
1012         int seconds = 0;
1013
1014
1015         if (!tz || (count > sizeof(polling_string) - 1))
1016                 return -EINVAL;
1017
1018         if (copy_from_user(polling_string, buffer, count))
1019                 return -EFAULT;
1020
1021         polling_string[count] = '\0';
1022
1023         seconds = simple_strtoul(polling_string, NULL, 0);
1024
1025         result = acpi_thermal_set_polling(tz, seconds);
1026         if (result)
1027                 return result;
1028
1029         acpi_thermal_check(tz);
1030
1031         return count;
1032 }
1033
1034 static int acpi_thermal_add_fs(struct acpi_device *device)
1035 {
1036         struct proc_dir_entry *entry = NULL;
1037
1038
1039         if (!acpi_device_dir(device)) {
1040                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1041                                                      acpi_thermal_dir);
1042                 if (!acpi_device_dir(device))
1043                         return -ENODEV;
1044                 acpi_device_dir(device)->owner = THIS_MODULE;
1045         }
1046
1047         /* 'state' [R] */
1048         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1049                                   S_IRUGO, acpi_device_dir(device));
1050         if (!entry)
1051                 return -ENODEV;
1052         else {
1053                 entry->proc_fops = &acpi_thermal_state_fops;
1054                 entry->data = acpi_driver_data(device);
1055                 entry->owner = THIS_MODULE;
1056         }
1057
1058         /* 'temperature' [R] */
1059         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1060                                   S_IRUGO, acpi_device_dir(device));
1061         if (!entry)
1062                 return -ENODEV;
1063         else {
1064                 entry->proc_fops = &acpi_thermal_temp_fops;
1065                 entry->data = acpi_driver_data(device);
1066                 entry->owner = THIS_MODULE;
1067         }
1068
1069         /* 'trip_points' [R/W] */
1070         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1071                                   S_IFREG | S_IRUGO | S_IWUSR,
1072                                   acpi_device_dir(device));
1073         if (!entry)
1074                 return -ENODEV;
1075         else {
1076                 entry->proc_fops = &acpi_thermal_trip_fops;
1077                 entry->data = acpi_driver_data(device);
1078                 entry->owner = THIS_MODULE;
1079         }
1080
1081         /* 'cooling_mode' [R/W] */
1082         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1083                                   S_IFREG | S_IRUGO | S_IWUSR,
1084                                   acpi_device_dir(device));
1085         if (!entry)
1086                 return -ENODEV;
1087         else {
1088                 entry->proc_fops = &acpi_thermal_cooling_fops;
1089                 entry->data = acpi_driver_data(device);
1090                 entry->owner = THIS_MODULE;
1091         }
1092
1093         /* 'polling_frequency' [R/W] */
1094         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1095                                   S_IFREG | S_IRUGO | S_IWUSR,
1096                                   acpi_device_dir(device));
1097         if (!entry)
1098                 return -ENODEV;
1099         else {
1100                 entry->proc_fops = &acpi_thermal_polling_fops;
1101                 entry->data = acpi_driver_data(device);
1102                 entry->owner = THIS_MODULE;
1103         }
1104
1105         return 0;
1106 }
1107
1108 static int acpi_thermal_remove_fs(struct acpi_device *device)
1109 {
1110
1111         if (acpi_device_dir(device)) {
1112                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1113                                   acpi_device_dir(device));
1114                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1115                                   acpi_device_dir(device));
1116                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1117                                   acpi_device_dir(device));
1118                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1119                                   acpi_device_dir(device));
1120                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1121                                   acpi_device_dir(device));
1122                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1123                 acpi_device_dir(device) = NULL;
1124         }
1125
1126         return 0;
1127 }
1128
1129 /* --------------------------------------------------------------------------
1130                                  Driver Interface
1131    -------------------------------------------------------------------------- */
1132
1133 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1134 {
1135         struct acpi_thermal *tz = data;
1136         struct acpi_device *device = NULL;
1137
1138
1139         if (!tz)
1140                 return;
1141
1142         device = tz->device;
1143
1144         switch (event) {
1145         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1146                 acpi_thermal_check(tz);
1147                 break;
1148         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1149                 acpi_thermal_get_trip_points(tz);
1150                 acpi_thermal_check(tz);
1151                 acpi_bus_generate_event(device, event, 0);
1152                 break;
1153         case ACPI_THERMAL_NOTIFY_DEVICES:
1154                 if (tz->flags.devices)
1155                         acpi_thermal_get_devices(tz);
1156                 acpi_bus_generate_event(device, event, 0);
1157                 break;
1158         default:
1159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1160                                   "Unsupported event [0x%x]\n", event));
1161                 break;
1162         }
1163
1164         return;
1165 }
1166
1167 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1168 {
1169         int result = 0;
1170
1171
1172         if (!tz)
1173                 return -EINVAL;
1174
1175         /* Get temperature [_TMP] (required) */
1176         result = acpi_thermal_get_temperature(tz);
1177         if (result)
1178                 return result;
1179
1180         /* Get trip points [_CRT, _PSV, etc.] (required) */
1181         result = acpi_thermal_get_trip_points(tz);
1182         if (result)
1183                 return result;
1184
1185         /* Set the cooling mode [_SCP] to active cooling (default) */
1186         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1187         if (!result)
1188                 tz->flags.cooling_mode = 1;
1189
1190         /* Get default polling frequency [_TZP] (optional) */
1191         if (tzp)
1192                 tz->polling_frequency = tzp;
1193         else
1194                 acpi_thermal_get_polling_frequency(tz);
1195
1196         /* Get devices in this thermal zone [_TZD] (optional) */
1197         result = acpi_thermal_get_devices(tz);
1198         if (!result)
1199                 tz->flags.devices = 1;
1200
1201         return 0;
1202 }
1203
1204 static int acpi_thermal_add(struct acpi_device *device)
1205 {
1206         int result = 0;
1207         acpi_status status = AE_OK;
1208         struct acpi_thermal *tz = NULL;
1209
1210
1211         if (!device)
1212                 return -EINVAL;
1213
1214         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1215         if (!tz)
1216                 return -ENOMEM;
1217
1218         tz->device = device;
1219         strcpy(tz->name, device->pnp.bus_id);
1220         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1221         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1222         acpi_driver_data(device) = tz;
1223
1224         result = acpi_thermal_get_info(tz);
1225         if (result)
1226                 goto end;
1227
1228         result = acpi_thermal_add_fs(device);
1229         if (result)
1230                 goto end;
1231
1232         init_timer(&tz->timer);
1233
1234         acpi_thermal_check(tz);
1235
1236         status = acpi_install_notify_handler(device->handle,
1237                                              ACPI_DEVICE_NOTIFY,
1238                                              acpi_thermal_notify, tz);
1239         if (ACPI_FAILURE(status)) {
1240                 result = -ENODEV;
1241                 goto end;
1242         }
1243
1244         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1245                acpi_device_name(device), acpi_device_bid(device),
1246                KELVIN_TO_CELSIUS(tz->temperature));
1247
1248       end:
1249         if (result) {
1250                 acpi_thermal_remove_fs(device);
1251                 kfree(tz);
1252         }
1253
1254         return result;
1255 }
1256
1257 static int acpi_thermal_remove(struct acpi_device *device, int type)
1258 {
1259         acpi_status status = AE_OK;
1260         struct acpi_thermal *tz = NULL;
1261
1262
1263         if (!device || !acpi_driver_data(device))
1264                 return -EINVAL;
1265
1266         tz = acpi_driver_data(device);
1267
1268         /* avoid timer adding new defer task */
1269         tz->zombie = 1;
1270         /* wait for running timer (on other CPUs) finish */
1271         del_timer_sync(&(tz->timer));
1272         /* synchronize deferred task */
1273         acpi_os_wait_events_complete(NULL);
1274         /* deferred task may reinsert timer */
1275         del_timer_sync(&(tz->timer));
1276
1277         status = acpi_remove_notify_handler(device->handle,
1278                                             ACPI_DEVICE_NOTIFY,
1279                                             acpi_thermal_notify);
1280
1281         /* Terminate policy */
1282         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1283                 tz->trips.passive.flags.enabled = 0;
1284                 acpi_thermal_passive(tz);
1285         }
1286         if (tz->trips.active[0].flags.valid
1287             && tz->trips.active[0].flags.enabled) {
1288                 tz->trips.active[0].flags.enabled = 0;
1289                 acpi_thermal_active(tz);
1290         }
1291
1292         acpi_thermal_remove_fs(device);
1293
1294         kfree(tz);
1295         return 0;
1296 }
1297
1298 static int acpi_thermal_resume(struct acpi_device *device)
1299 {
1300         struct acpi_thermal *tz = NULL;
1301         int i, j, power_state, result;
1302
1303
1304         if (!device || !acpi_driver_data(device))
1305                 return -EINVAL;
1306
1307         tz = acpi_driver_data(device);
1308
1309         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1310                 if (!(&tz->trips.active[i]))
1311                         break;
1312                 if (!tz->trips.active[i].flags.valid)
1313                         break;
1314                 tz->trips.active[i].flags.enabled = 1;
1315                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1316                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1317                             handles[j], &power_state);
1318                         if (result || (power_state != ACPI_STATE_D0)) {
1319                                 tz->trips.active[i].flags.enabled = 0;
1320                                 break;
1321                         }
1322                 }
1323                 tz->state.active |= tz->trips.active[i].flags.enabled;
1324         }
1325
1326         acpi_thermal_check(tz);
1327
1328         return AE_OK;
1329 }
1330
1331 static int __init acpi_thermal_init(void)
1332 {
1333         int result = 0;
1334
1335         if (off) {
1336                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1337                 return -ENODEV;
1338         }
1339         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1340         if (!acpi_thermal_dir)
1341                 return -ENODEV;
1342         acpi_thermal_dir->owner = THIS_MODULE;
1343
1344         result = acpi_bus_register_driver(&acpi_thermal_driver);
1345         if (result < 0) {
1346                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1347                 return -ENODEV;
1348         }
1349
1350         return 0;
1351 }
1352
1353 static void __exit acpi_thermal_exit(void)
1354 {
1355
1356         acpi_bus_unregister_driver(&acpi_thermal_driver);
1357
1358         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1359
1360         return;
1361 }
1362
1363 module_init(acpi_thermal_init);
1364 module_exit(acpi_thermal_exit);