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