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   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/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 <asm/uaccess.h>
  44
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47
  48 #define ACPI_THERMAL_COMPONENT          0x04000000
  49 #define ACPI_THERMAL_CLASS              "thermal_zone"
  50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  51 #define ACPI_THERMAL_FILE_STATE         "state"
  52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  63 #define ACPI_THERMAL_MODE_CRITICAL      0xff
  64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  71
  72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  73 ACPI_MODULE_NAME("thermal");
  74
  75 MODULE_AUTHOR("Paul Diefenbaugh");
  76 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  77 MODULE_LICENSE("GPL");
  78
  79 static int tzp;
  80 module_param(tzp, int, 0);
  81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  82
  83 static int acpi_thermal_add(struct acpi_device *device);
  84 static int acpi_thermal_remove(struct acpi_device *device, int type);
  85 static int acpi_thermal_resume(struct acpi_device *device);
  86 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  88 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  89 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  90 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  91                                                const char __user *, size_t,
  92                                                loff_t *);
  93 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  94 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  95                                           size_t, loff_t *);
  96
  97 static struct acpi_driver acpi_thermal_driver = {
  98         .name = "thermal",
  99         .class = ACPI_THERMAL_CLASS,
 100         .ids = ACPI_THERMAL_HID,
 101         .ops = {
 102                 .add = acpi_thermal_add,
 103                 .remove = acpi_thermal_remove,
 104                 .resume = acpi_thermal_resume,
 105                 },
 106 };
 107
 108 struct acpi_thermal_state {
 109         u8 critical:1;
 110         u8 hot:1;
 111         u8 passive:1;
 112         u8 active:1;
 113         u8 reserved:4;
 114         int active_index;
 115 };
 116
 117 struct acpi_thermal_state_flags {
 118         u8 valid:1;
 119         u8 enabled:1;
 120         u8 reserved:6;
 121 };
 122
 123 struct acpi_thermal_critical {
 124         struct acpi_thermal_state_flags flags;
 125         unsigned long temperature;
 126 };
 127
 128 struct acpi_thermal_hot {
 129         struct acpi_thermal_state_flags flags;
 130         unsigned long temperature;
 131 };
 132
 133 struct acpi_thermal_passive {
 134         struct acpi_thermal_state_flags flags;
 135         unsigned long temperature;
 136         unsigned long tc1;
 137         unsigned long tc2;
 138         unsigned long tsp;
 139         struct acpi_handle_list devices;
 140 };
 141
 142 struct acpi_thermal_active {
 143         struct acpi_thermal_state_flags flags;
 144         unsigned long temperature;
 145         struct acpi_handle_list devices;
 146 };
 147
 148 struct acpi_thermal_trips {
 149         struct acpi_thermal_critical critical;
 150         struct acpi_thermal_hot hot;
 151         struct acpi_thermal_passive passive;
 152         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 153 };
 154
 155 struct acpi_thermal_flags {
 156         u8 cooling_mode:1;      /* _SCP */
 157         u8 devices:1;           /* _TZD */
 158         u8 reserved:6;
 159 };
 160
 161 struct acpi_thermal {
 162         struct acpi_device * device;
 163         acpi_bus_id name;
 164         unsigned long temperature;
 165         unsigned long last_temperature;
 166         unsigned long polling_frequency;
 167         u8 cooling_mode;
 168         volatile u8 zombie;
 169         struct acpi_thermal_flags flags;
 170         struct acpi_thermal_state state;
 171         struct acpi_thermal_trips trips;
 172         struct acpi_handle_list devices;
 173         struct timer_list timer;
 174 };
 175
 176 static const struct file_operations acpi_thermal_state_fops = {
 177         .open = acpi_thermal_state_open_fs,
 178         .read = seq_read,
 179         .llseek = seq_lseek,
 180         .release = single_release,
 181 };
 182
 183 static const struct file_operations acpi_thermal_temp_fops = {
 184         .open = acpi_thermal_temp_open_fs,
 185         .read = seq_read,
 186         .llseek = seq_lseek,
 187         .release = single_release,
 188 };
 189
 190 static const struct file_operations acpi_thermal_trip_fops = {
 191         .open = acpi_thermal_trip_open_fs,
 192         .read = seq_read,
 193         .llseek = seq_lseek,
 194         .release = single_release,
 195 };
 196
 197 static const struct file_operations acpi_thermal_cooling_fops = {
 198         .open = acpi_thermal_cooling_open_fs,
 199         .read = seq_read,
 200         .write = acpi_thermal_write_cooling_mode,
 201         .llseek = seq_lseek,
 202         .release = single_release,
 203 };
 204
 205 static const struct file_operations acpi_thermal_polling_fops = {
 206         .open = acpi_thermal_polling_open_fs,
 207         .read = seq_read,
 208         .write = acpi_thermal_write_polling,
 209         .llseek = seq_lseek,
 210         .release = single_release,
 211 };
 212
 213 /* --------------------------------------------------------------------------
 214                              Thermal Zone Management
 215    -------------------------------------------------------------------------- */
 216
 217 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 218 {
 219         acpi_status status = AE_OK;
 220
 221
 222         if (!tz)
 223                 return -EINVAL;
 224
 225         tz->last_temperature = tz->temperature;
 226
 227         status =
 228             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 229         if (ACPI_FAILURE(status))
 230                 return -ENODEV;
 231
 232         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 233                           tz->temperature));
 234
 235         return 0;
 236 }
 237
 238 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 239 {
 240         acpi_status status = AE_OK;
 241
 242
 243         if (!tz)
 244                 return -EINVAL;
 245
 246         status =
 247             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 248                                   &tz->polling_frequency);
 249         if (ACPI_FAILURE(status))
 250                 return -ENODEV;
 251
 252         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 253                           tz->polling_frequency));
 254
 255         return 0;
 256 }
 257
 258 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 259 {
 260
 261         if (!tz)
 262                 return -EINVAL;
 263
 264         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 265
 266         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 267                           "Polling frequency set to %lu seconds\n",
 268                           tz->polling_frequency/10));
 269
 270         return 0;
 271 }
 272
 273 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 274 {
 275         acpi_status status = AE_OK;
 276         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 277         struct acpi_object_list arg_list = { 1, &arg0 };
 278         acpi_handle handle = NULL;
 279
 280
 281         if (!tz)
 282                 return -EINVAL;
 283
 284         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 285         if (ACPI_FAILURE(status)) {
 286                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 287                 return -ENODEV;
 288         }
 289
 290         arg0.integer.value = mode;
 291
 292         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 293         if (ACPI_FAILURE(status))
 294                 return -ENODEV;
 295
 296         tz->cooling_mode = mode;
 297
 298         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 299                           mode ? "passive" : "active"));
 300
 301         return 0;
 302 }
 303
 304 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 305 {
 306         acpi_status status = AE_OK;
 307         int i = 0;
 308
 309
 310         if (!tz)
 311                 return -EINVAL;
 312
 313         /* Critical Shutdown (required) */
 314
 315         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 316                                        &tz->trips.critical.temperature);
 317         if (ACPI_FAILURE(status)) {
 318                 tz->trips.critical.flags.valid = 0;
 319                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 320                 return -ENODEV;
 321         } else {
 322                 tz->trips.critical.flags.valid = 1;
 323                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 324                                   "Found critical threshold [%lu]\n",
 325                                   tz->trips.critical.temperature));
 326         }
 327
 328         /* Critical Sleep (optional) */
 329
 330         status =
 331             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 332                                   &tz->trips.hot.temperature);
 333         if (ACPI_FAILURE(status)) {
 334                 tz->trips.hot.flags.valid = 0;
 335                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 336         } else {
 337                 tz->trips.hot.flags.valid = 1;
 338                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 339                                   tz->trips.hot.temperature));
 340         }
 341
 342         /* Passive: Processors (optional) */
 343
 344         status =
 345             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
 346                                   &tz->trips.passive.temperature);
 347         if (ACPI_FAILURE(status)) {
 348                 tz->trips.passive.flags.valid = 0;
 349                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 350         } else {
 351                 tz->trips.passive.flags.valid = 1;
 352
 353                 status =
 354                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 355                                           &tz->trips.passive.tc1);
 356                 if (ACPI_FAILURE(status))
 357                         tz->trips.passive.flags.valid = 0;
 358
 359                 status =
 360                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 361                                           &tz->trips.passive.tc2);
 362                 if (ACPI_FAILURE(status))
 363                         tz->trips.passive.flags.valid = 0;
 364
 365                 status =
 366                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 367                                           &tz->trips.passive.tsp);
 368                 if (ACPI_FAILURE(status))
 369                         tz->trips.passive.flags.valid = 0;
 370
 371                 status =
 372                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 373                                             &tz->trips.passive.devices);
 374                 if (ACPI_FAILURE(status))
 375                         tz->trips.passive.flags.valid = 0;
 376
 377                 if (!tz->trips.passive.flags.valid)
 378                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 379                 else
 380                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 381                                           "Found passive threshold [%lu]\n",
 382                                           tz->trips.passive.temperature));
 383         }
 384
 385         /* Active: Fans, etc. (optional) */
 386
 387         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 388
 389                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 390
 391                 status =
 392                     acpi_evaluate_integer(tz->device->handle, name, NULL,
 393                                           &tz->trips.active[i].temperature);
 394                 if (ACPI_FAILURE(status))
 395                         break;
 396
 397                 name[2] = 'L';
 398                 status =
 399                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 400                                             &tz->trips.active[i].devices);
 401                 if (ACPI_SUCCESS(status)) {
 402                         tz->trips.active[i].flags.valid = 1;
 403                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 404                                           "Found active threshold [%d]:[%lu]\n",
 405                                           i, tz->trips.active[i].temperature));
 406                 } else
 407                         ACPI_EXCEPTION((AE_INFO, status,
 408                                         "Invalid active threshold [%d]", i));
 409         }
 410
 411         return 0;
 412 }
 413
 414 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 415 {
 416         acpi_status status = AE_OK;
 417
 418
 419         if (!tz)
 420                 return -EINVAL;
 421
 422         status =
 423             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 424         if (ACPI_FAILURE(status))
 425                 return -ENODEV;
 426
 427         return 0;
 428 }
 429
 430 static int acpi_thermal_call_usermode(char *path)
 431 {
 432         char *argv[2] = { NULL, NULL };
 433         char *envp[3] = { NULL, NULL, NULL };
 434
 435
 436         if (!path)
 437                 return -EINVAL;
 438
 439         argv[0] = path;
 440
 441         /* minimal command environment */
 442         envp[0] = "HOME=/";
 443         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 444
 445         call_usermodehelper(argv[0], argv, envp, 0);
 446
 447         return 0;
 448 }
 449
 450 static int acpi_thermal_critical(struct acpi_thermal *tz)
 451 {
 452         if (!tz || !tz->trips.critical.flags.valid)
 453                 return -EINVAL;
 454
 455         if (tz->temperature >= tz->trips.critical.temperature) {
 456                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 457                 tz->trips.critical.flags.enabled = 1;
 458         } else if (tz->trips.critical.flags.enabled)
 459                 tz->trips.critical.flags.enabled = 0;
 460
 461         printk(KERN_EMERG
 462                "Critical temperature reached (%ld C), shutting down.\n",
 463                KELVIN_TO_CELSIUS(tz->temperature));
 464         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 465                                 tz->trips.critical.flags.enabled);
 466
 467         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 468
 469         return 0;
 470 }
 471
 472 static int acpi_thermal_hot(struct acpi_thermal *tz)
 473 {
 474         if (!tz || !tz->trips.hot.flags.valid)
 475                 return -EINVAL;
 476
 477         if (tz->temperature >= tz->trips.hot.temperature) {
 478                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 479                 tz->trips.hot.flags.enabled = 1;
 480         } else if (tz->trips.hot.flags.enabled)
 481                 tz->trips.hot.flags.enabled = 0;
 482
 483         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 484                                 tz->trips.hot.flags.enabled);
 485
 486         /* TBD: Call user-mode "sleep(S4)" function */
 487
 488         return 0;
 489 }
 490
 491 static void acpi_thermal_passive(struct acpi_thermal *tz)
 492 {
 493         int result = 1;
 494         struct acpi_thermal_passive *passive = NULL;
 495         int trend = 0;
 496         int i = 0;
 497
 498
 499         if (!tz || !tz->trips.passive.flags.valid)
 500                 return;
 501
 502         passive = &(tz->trips.passive);
 503
 504         /*
 505          * Above Trip?
 506          * -----------
 507          * Calculate the thermal trend (using the passive cooling equation)
 508          * and modify the performance limit for all passive cooling devices
 509          * accordingly.  Note that we assume symmetry.
 510          */
 511         if (tz->temperature >= passive->temperature) {
 512                 trend =
 513                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 514                     (passive->tc2 * (tz->temperature - passive->temperature));
 515                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 516                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 517                                   trend, passive->tc1, tz->temperature,
 518                                   tz->last_temperature, passive->tc2,
 519                                   tz->temperature, passive->temperature));
 520                 passive->flags.enabled = 1;
 521                 /* Heating up? */
 522                 if (trend > 0)
 523                         for (i = 0; i < passive->devices.count; i++)
 524                                 acpi_processor_set_thermal_limit(passive->
 525                                                                  devices.
 526                                                                  handles[i],
 527                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 528                 /* Cooling off? */
 529                 else if (trend < 0) {
 530                         for (i = 0; i < passive->devices.count; i++)
 531                                 /*
 532                                  * assume that we are on highest
 533                                  * freq/lowest thrott and can leave
 534                                  * passive mode, even in error case
 535                                  */
 536                                 if (!acpi_processor_set_thermal_limit
 537                                     (passive->devices.handles[i],
 538                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 539                                         result = 0;
 540                         /*
 541                          * Leave cooling mode, even if the temp might
 542                          * higher than trip point This is because some
 543                          * machines might have long thermal polling
 544                          * frequencies (tsp) defined. We will fall back
 545                          * into passive mode in next cycle (probably quicker)
 546                          */
 547                         if (result) {
 548                                 passive->flags.enabled = 0;
 549                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 550                                                   "Disabling passive cooling, still above threshold,"
 551                                                   " but we are cooling down\n"));
 552                         }
 553                 }
 554                 return;
 555         }
 556
 557         /*
 558          * Below Trip?
 559          * -----------
 560          * Implement passive cooling hysteresis to slowly increase performance
 561          * and avoid thrashing around the passive trip point.  Note that we
 562          * assume symmetry.
 563          */
 564         if (!passive->flags.enabled)
 565                 return;
 566         for (i = 0; i < passive->devices.count; i++)
 567                 if (!acpi_processor_set_thermal_limit
 568                     (passive->devices.handles[i],
 569                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 570                         result = 0;
 571         if (result) {
 572                 passive->flags.enabled = 0;
 573                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 574                                   "Disabling passive cooling (zone is cool)\n"));
 575         }
 576 }
 577
 578 static void acpi_thermal_active(struct acpi_thermal *tz)
 579 {
 580         int result = 0;
 581         struct acpi_thermal_active *active = NULL;
 582         int i = 0;
 583         int j = 0;
 584         unsigned long maxtemp = 0;
 585
 586
 587         if (!tz)
 588                 return;
 589
 590         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 591                 active = &(tz->trips.active[i]);
 592                 if (!active || !active->flags.valid)
 593                         break;
 594                 if (tz->temperature >= active->temperature) {
 595                         /*
 596                          * Above Threshold?
 597                          * ----------------
 598                          * If not already enabled, turn ON all cooling devices
 599                          * associated with this active threshold.
 600                          */
 601                         if (active->temperature > maxtemp)
 602                                 tz->state.active_index = i;
 603                         maxtemp = active->temperature;
 604                         if (active->flags.enabled)
 605                                 continue;
 606                         for (j = 0; j < active->devices.count; j++) {
 607                                 result =
 608                                     acpi_bus_set_power(active->devices.
 609                                                        handles[j],
 610                                                        ACPI_STATE_D0);
 611                                 if (result) {
 612                                         printk(KERN_WARNING PREFIX
 613                                                       "Unable to turn cooling device [%p] 'on'\n",
 614                                                       active->devices.
 615                                                       handles[j]);
 616                                         continue;
 617                                 }
 618                                 active->flags.enabled = 1;
 619                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 620                                                   "Cooling device [%p] now 'on'\n",
 621                                                   active->devices.handles[j]));
 622                         }
 623                         continue;
 624                 }
 625                 if (!active->flags.enabled)
 626                         continue;
 627                 /*
 628                  * Below Threshold?
 629                  * ----------------
 630                  * Turn OFF all cooling devices associated with this
 631                  * threshold.
 632                  */
 633                 for (j = 0; j < active->devices.count; j++) {
 634                         result = acpi_bus_set_power(active->devices.handles[j],
 635                                                     ACPI_STATE_D3);
 636                         if (result) {
 637                                 printk(KERN_WARNING PREFIX
 638                                               "Unable to turn cooling device [%p] 'off'\n",
 639                                               active->devices.handles[j]);
 640                                 continue;
 641                         }
 642                         active->flags.enabled = 0;
 643                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 644                                           "Cooling device [%p] now 'off'\n",
 645                                           active->devices.handles[j]));
 646                 }
 647         }
 648 }
 649
 650 static void acpi_thermal_check(void *context);
 651
 652 static void acpi_thermal_run(unsigned long data)
 653 {
 654         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 655         if (!tz->zombie)
 656                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 657 }
 658
 659 static void acpi_thermal_check(void *data)
 660 {
 661         int result = 0;
 662         struct acpi_thermal *tz = data;
 663         unsigned long sleep_time = 0;
 664         int i = 0;
 665         struct acpi_thermal_state state;
 666
 667
 668         if (!tz) {
 669                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 670                 return;
 671         }
 672
 673         state = tz->state;
 674
 675         result = acpi_thermal_get_temperature(tz);
 676         if (result)
 677                 return;
 678
 679         memset(&tz->state, 0, sizeof(tz->state));
 680
 681         /*
 682          * Check Trip Points
 683          * -----------------
 684          * Compare the current temperature to the trip point values to see
 685          * if we've entered one of the thermal policy states.  Note that
 686          * this function determines when a state is entered, but the
 687          * individual policy decides when it is exited (e.g. hysteresis).
 688          */
 689         if (tz->trips.critical.flags.valid)
 690                 state.critical |=
 691                     (tz->temperature >= tz->trips.critical.temperature);
 692         if (tz->trips.hot.flags.valid)
 693                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 694         if (tz->trips.passive.flags.valid)
 695                 state.passive |=
 696                     (tz->temperature >= tz->trips.passive.temperature);
 697         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 698                 if (tz->trips.active[i].flags.valid)
 699                         state.active |=
 700                             (tz->temperature >=
 701                              tz->trips.active[i].temperature);
 702
 703         /*
 704          * Invoke Policy
 705          * -------------
 706          * Separated from the above check to allow individual policy to
 707          * determine when to exit a given state.
 708          */
 709         if (state.critical)
 710                 acpi_thermal_critical(tz);
 711         if (state.hot)
 712                 acpi_thermal_hot(tz);
 713         if (state.passive)
 714                 acpi_thermal_passive(tz);
 715         if (state.active)
 716                 acpi_thermal_active(tz);
 717
 718         /*
 719          * Calculate State
 720          * ---------------
 721          * Again, separated from the above two to allow independent policy
 722          * decisions.
 723          */
 724         tz->state.critical = tz->trips.critical.flags.enabled;
 725         tz->state.hot = tz->trips.hot.flags.enabled;
 726         tz->state.passive = tz->trips.passive.flags.enabled;
 727         tz->state.active = 0;
 728         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 729                 tz->state.active |= tz->trips.active[i].flags.enabled;
 730
 731         /*
 732          * Calculate Sleep Time
 733          * --------------------
 734          * If we're in the passive state, use _TSP's value.  Otherwise
 735          * use the default polling frequency (e.g. _TZP).  If no polling
 736          * frequency is specified then we'll wait forever (at least until
 737          * a thermal event occurs).  Note that _TSP and _TZD values are
 738          * given in 1/10th seconds (we must covert to milliseconds).
 739          */
 740         if (tz->state.passive)
 741                 sleep_time = tz->trips.passive.tsp * 100;
 742         else if (tz->polling_frequency > 0)
 743                 sleep_time = tz->polling_frequency * 100;
 744
 745         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 746                           tz->name, tz->temperature, sleep_time));
 747
 748         /*
 749          * Schedule Next Poll
 750          * ------------------
 751          */
 752         if (!sleep_time) {
 753                 if (timer_pending(&(tz->timer)))
 754                         del_timer(&(tz->timer));
 755         } else {
 756                 if (timer_pending(&(tz->timer)))
 757                         mod_timer(&(tz->timer),
 758                                         jiffies + (HZ * sleep_time) / 1000);
 759                 else {
 760                         tz->timer.data = (unsigned long)tz;
 761                         tz->timer.function = acpi_thermal_run;
 762                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 763                         add_timer(&(tz->timer));
 764                 }
 765         }
 766
 767         return;
 768 }
 769
 770 /* --------------------------------------------------------------------------
 771                               FS Interface (/proc)
 772    -------------------------------------------------------------------------- */
 773
 774 static struct proc_dir_entry *acpi_thermal_dir;
 775
 776 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 777 {
 778         struct acpi_thermal *tz = seq->private;
 779
 780
 781         if (!tz)
 782                 goto end;
 783
 784         seq_puts(seq, "state:                   ");
 785
 786         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 787             && !tz->state.active)
 788                 seq_puts(seq, "ok\n");
 789         else {
 790                 if (tz->state.critical)
 791                         seq_puts(seq, "critical ");
 792                 if (tz->state.hot)
 793                         seq_puts(seq, "hot ");
 794                 if (tz->state.passive)
 795                         seq_puts(seq, "passive ");
 796                 if (tz->state.active)
 797                         seq_printf(seq, "active[%d]", tz->state.active_index);
 798                 seq_puts(seq, "\n");
 799         }
 800
 801       end:
 802         return 0;
 803 }
 804
 805 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 806 {
 807         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 808 }
 809
 810 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 811 {
 812         int result = 0;
 813         struct acpi_thermal *tz = seq->private;
 814
 815
 816         if (!tz)
 817                 goto end;
 818
 819         result = acpi_thermal_get_temperature(tz);
 820         if (result)
 821                 goto end;
 822
 823         seq_printf(seq, "temperature:             %ld C\n",
 824                    KELVIN_TO_CELSIUS(tz->temperature));
 825
 826       end:
 827         return 0;
 828 }
 829
 830 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 831 {
 832         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 833 }
 834
 835 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 836 {
 837         struct acpi_thermal *tz = seq->private;
 838         int i = 0;
 839         int j = 0;
 840
 841
 842         if (!tz)
 843                 goto end;
 844
 845         if (tz->trips.critical.flags.valid)
 846                 seq_printf(seq, "critical (S5):           %ld C\n",
 847                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 848
 849         if (tz->trips.hot.flags.valid)
 850                 seq_printf(seq, "hot (S4):                %ld C\n",
 851                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 852
 853         if (tz->trips.passive.flags.valid) {
 854                 seq_printf(seq,
 855                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 856                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 857                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 858                            tz->trips.passive.tsp);
 859                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 860
 861                         seq_printf(seq, "0x%p ",
 862                                    tz->trips.passive.devices.handles[j]);
 863                 }
 864                 seq_puts(seq, "\n");
 865         }
 866
 867         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 868                 if (!(tz->trips.active[i].flags.valid))
 869                         break;
 870                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 871                            i,
 872                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 873                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 874                         seq_printf(seq, "0x%p ",
 875                                    tz->trips.active[i].devices.handles[j]);
 876                 seq_puts(seq, "\n");
 877         }
 878
 879       end:
 880         return 0;
 881 }
 882
 883 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 884 {
 885         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 886 }
 887
 888 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 889 {
 890         struct acpi_thermal *tz = seq->private;
 891
 892
 893         if (!tz)
 894                 goto end;
 895
 896         if (!tz->flags.cooling_mode) {
 897                 seq_puts(seq, "<setting not supported>\n");
 898         }
 899
 900         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 901                 seq_printf(seq, "cooling mode:  critical\n");
 902         else
 903                 seq_printf(seq, "cooling mode:  %s\n",
 904                            tz->cooling_mode ? "passive" : "active");
 905
 906       end:
 907         return 0;
 908 }
 909
 910 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 911 {
 912         return single_open(file, acpi_thermal_cooling_seq_show,
 913                            PDE(inode)->data);
 914 }
 915
 916 static ssize_t
 917 acpi_thermal_write_cooling_mode(struct file *file,
 918                                 const char __user * buffer,
 919                                 size_t count, loff_t * ppos)
 920 {
 921         struct seq_file *m = file->private_data;
 922         struct acpi_thermal *tz = m->private;
 923         int result = 0;
 924         char mode_string[12] = { '\0' };
 925
 926
 927         if (!tz || (count > sizeof(mode_string) - 1))
 928                 return -EINVAL;
 929
 930         if (!tz->flags.cooling_mode)
 931                 return -ENODEV;
 932
 933         if (copy_from_user(mode_string, buffer, count))
 934                 return -EFAULT;
 935
 936         mode_string[count] = '\0';
 937
 938         result = acpi_thermal_set_cooling_mode(tz,
 939                                                simple_strtoul(mode_string, NULL,
 940                                                               0));
 941         if (result)
 942                 return result;
 943
 944         acpi_thermal_check(tz);
 945
 946         return count;
 947 }
 948
 949 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
 950 {
 951         struct acpi_thermal *tz = seq->private;
 952
 953
 954         if (!tz)
 955                 goto end;
 956
 957         if (!tz->polling_frequency) {
 958                 seq_puts(seq, "<polling disabled>\n");
 959                 goto end;
 960         }
 961
 962         seq_printf(seq, "polling frequency:       %lu seconds\n",
 963                    (tz->polling_frequency / 10));
 964
 965       end:
 966         return 0;
 967 }
 968
 969 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
 970 {
 971         return single_open(file, acpi_thermal_polling_seq_show,
 972                            PDE(inode)->data);
 973 }
 974
 975 static ssize_t
 976 acpi_thermal_write_polling(struct file *file,
 977                            const char __user * buffer,
 978                            size_t count, loff_t * ppos)
 979 {
 980         struct seq_file *m = file->private_data;
 981         struct acpi_thermal *tz = m->private;
 982         int result = 0;
 983         char polling_string[12] = { '\0' };
 984         int seconds = 0;
 985
 986
 987         if (!tz || (count > sizeof(polling_string) - 1))
 988                 return -EINVAL;
 989
 990         if (copy_from_user(polling_string, buffer, count))
 991                 return -EFAULT;
 992
 993         polling_string[count] = '\0';
 994
 995         seconds = simple_strtoul(polling_string, NULL, 0);
 996
 997         result = acpi_thermal_set_polling(tz, seconds);
 998         if (result)
 999                 return result;
1000
1001         acpi_thermal_check(tz);
1002
1003         return count;
1004 }
1005
1006 static int acpi_thermal_add_fs(struct acpi_device *device)
1007 {
1008         struct proc_dir_entry *entry = NULL;
1009
1010
1011         if (!acpi_device_dir(device)) {
1012                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1013                                                      acpi_thermal_dir);
1014                 if (!acpi_device_dir(device))
1015                         return -ENODEV;
1016                 acpi_device_dir(device)->owner = THIS_MODULE;
1017         }
1018
1019         /* 'state' [R] */
1020         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1021                                   S_IRUGO, acpi_device_dir(device));
1022         if (!entry)
1023                 return -ENODEV;
1024         else {
1025                 entry->proc_fops = &acpi_thermal_state_fops;
1026                 entry->data = acpi_driver_data(device);
1027                 entry->owner = THIS_MODULE;
1028         }
1029
1030         /* 'temperature' [R] */
1031         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1032                                   S_IRUGO, acpi_device_dir(device));
1033         if (!entry)
1034                 return -ENODEV;
1035         else {
1036                 entry->proc_fops = &acpi_thermal_temp_fops;
1037                 entry->data = acpi_driver_data(device);
1038                 entry->owner = THIS_MODULE;
1039         }
1040
1041         /* 'trip_points' [R/W] */
1042         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1043                                   S_IFREG | S_IRUGO | S_IWUSR,
1044                                   acpi_device_dir(device));
1045         if (!entry)
1046                 return -ENODEV;
1047         else {
1048                 entry->proc_fops = &acpi_thermal_trip_fops;
1049                 entry->data = acpi_driver_data(device);
1050                 entry->owner = THIS_MODULE;
1051         }
1052
1053         /* 'cooling_mode' [R/W] */
1054         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1055                                   S_IFREG | S_IRUGO | S_IWUSR,
1056                                   acpi_device_dir(device));
1057         if (!entry)
1058                 return -ENODEV;
1059         else {
1060                 entry->proc_fops = &acpi_thermal_cooling_fops;
1061                 entry->data = acpi_driver_data(device);
1062                 entry->owner = THIS_MODULE;
1063         }
1064
1065         /* 'polling_frequency' [R/W] */
1066         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1067                                   S_IFREG | S_IRUGO | S_IWUSR,
1068                                   acpi_device_dir(device));
1069         if (!entry)
1070                 return -ENODEV;
1071         else {
1072                 entry->proc_fops = &acpi_thermal_polling_fops;
1073                 entry->data = acpi_driver_data(device);
1074                 entry->owner = THIS_MODULE;
1075         }
1076
1077         return 0;
1078 }
1079
1080 static int acpi_thermal_remove_fs(struct acpi_device *device)
1081 {
1082
1083         if (acpi_device_dir(device)) {
1084                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1085                                   acpi_device_dir(device));
1086                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1087                                   acpi_device_dir(device));
1088                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1089                                   acpi_device_dir(device));
1090                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1091                                   acpi_device_dir(device));
1092                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1093                                   acpi_device_dir(device));
1094                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1095                 acpi_device_dir(device) = NULL;
1096         }
1097
1098         return 0;
1099 }
1100
1101 /* --------------------------------------------------------------------------
1102                                  Driver Interface
1103    -------------------------------------------------------------------------- */
1104
1105 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1106 {
1107         struct acpi_thermal *tz = data;
1108         struct acpi_device *device = NULL;
1109
1110
1111         if (!tz)
1112                 return;
1113
1114         device = tz->device;
1115
1116         switch (event) {
1117         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1118                 acpi_thermal_check(tz);
1119                 break;
1120         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1121                 acpi_thermal_get_trip_points(tz);
1122                 acpi_thermal_check(tz);
1123                 acpi_bus_generate_event(device, event, 0);
1124                 break;
1125         case ACPI_THERMAL_NOTIFY_DEVICES:
1126                 if (tz->flags.devices)
1127                         acpi_thermal_get_devices(tz);
1128                 acpi_bus_generate_event(device, event, 0);
1129                 break;
1130         default:
1131                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1132                                   "Unsupported event [0x%x]\n", event));
1133                 break;
1134         }
1135
1136         return;
1137 }
1138
1139 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1140 {
1141         int result = 0;
1142
1143
1144         if (!tz)
1145                 return -EINVAL;
1146
1147         /* Get temperature [_TMP] (required) */
1148         result = acpi_thermal_get_temperature(tz);
1149         if (result)
1150                 return result;
1151
1152         /* Get trip points [_CRT, _PSV, etc.] (required) */
1153         result = acpi_thermal_get_trip_points(tz);
1154         if (result)
1155                 return result;
1156
1157         /* Set the cooling mode [_SCP] to active cooling (default) */
1158         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1159         if (!result)
1160                 tz->flags.cooling_mode = 1;
1161         else {
1162                 /* Oh,we have not _SCP method.
1163                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1164                 tz->flags.cooling_mode = 0;
1165                 if (tz->trips.active[0].flags.valid
1166                     && tz->trips.passive.flags.valid) {
1167                         if (tz->trips.passive.temperature >
1168                             tz->trips.active[0].temperature)
1169                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1170                         else
1171                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1172                 } else if (!tz->trips.active[0].flags.valid
1173                            && tz->trips.passive.flags.valid) {
1174                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1175                 } else if (tz->trips.active[0].flags.valid
1176                            && !tz->trips.passive.flags.valid) {
1177                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1178                 } else {
1179                         /* _ACx and _PSV are optional, but _CRT is required */
1180                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1181                 }
1182         }
1183
1184         /* Get default polling frequency [_TZP] (optional) */
1185         if (tzp)
1186                 tz->polling_frequency = tzp;
1187         else
1188                 acpi_thermal_get_polling_frequency(tz);
1189
1190         /* Get devices in this thermal zone [_TZD] (optional) */
1191         result = acpi_thermal_get_devices(tz);
1192         if (!result)
1193                 tz->flags.devices = 1;
1194
1195         return 0;
1196 }
1197
1198 static int acpi_thermal_add(struct acpi_device *device)
1199 {
1200         int result = 0;
1201         acpi_status status = AE_OK;
1202         struct acpi_thermal *tz = NULL;
1203
1204
1205         if (!device)
1206                 return -EINVAL;
1207
1208         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1209         if (!tz)
1210                 return -ENOMEM;
1211
1212         tz->device = device;
1213         strcpy(tz->name, device->pnp.bus_id);
1214         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1215         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1216         acpi_driver_data(device) = tz;
1217
1218         result = acpi_thermal_get_info(tz);
1219         if (result)
1220                 goto end;
1221
1222         result = acpi_thermal_add_fs(device);
1223         if (result)
1224                 goto end;
1225
1226         init_timer(&tz->timer);
1227
1228         acpi_thermal_check(tz);
1229
1230         status = acpi_install_notify_handler(device->handle,
1231                                              ACPI_DEVICE_NOTIFY,
1232                                              acpi_thermal_notify, tz);
1233         if (ACPI_FAILURE(status)) {
1234                 result = -ENODEV;
1235                 goto end;
1236         }
1237
1238         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1239                acpi_device_name(device), acpi_device_bid(device),
1240                KELVIN_TO_CELSIUS(tz->temperature));
1241
1242       end:
1243         if (result) {
1244                 acpi_thermal_remove_fs(device);
1245                 kfree(tz);
1246         }
1247
1248         return result;
1249 }
1250
1251 static int acpi_thermal_remove(struct acpi_device *device, int type)
1252 {
1253         acpi_status status = AE_OK;
1254         struct acpi_thermal *tz = NULL;
1255
1256
1257         if (!device || !acpi_driver_data(device))
1258                 return -EINVAL;
1259
1260         tz = acpi_driver_data(device);
1261
1262         /* avoid timer adding new defer task */
1263         tz->zombie = 1;
1264         /* wait for running timer (on other CPUs) finish */
1265         del_timer_sync(&(tz->timer));
1266         /* synchronize deferred task */
1267         acpi_os_wait_events_complete(NULL);
1268         /* deferred task may reinsert timer */
1269         del_timer_sync(&(tz->timer));
1270
1271         status = acpi_remove_notify_handler(device->handle,
1272                                             ACPI_DEVICE_NOTIFY,
1273                                             acpi_thermal_notify);
1274
1275         /* Terminate policy */
1276         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1277                 tz->trips.passive.flags.enabled = 0;
1278                 acpi_thermal_passive(tz);
1279         }
1280         if (tz->trips.active[0].flags.valid
1281             && tz->trips.active[0].flags.enabled) {
1282                 tz->trips.active[0].flags.enabled = 0;
1283                 acpi_thermal_active(tz);
1284         }
1285
1286         acpi_thermal_remove_fs(device);
1287
1288         kfree(tz);
1289         return 0;
1290 }
1291
1292 static int acpi_thermal_resume(struct acpi_device *device)
1293 {
1294         struct acpi_thermal *tz = NULL;
1295         int i, j, power_state, result;
1296
1297
1298         if (!device || !acpi_driver_data(device))
1299                 return -EINVAL;
1300
1301         tz = acpi_driver_data(device);
1302
1303         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1304                 if (!(&tz->trips.active[i]))
1305                         break;
1306                 if (!tz->trips.active[i].flags.valid)
1307                         break;
1308                 tz->trips.active[i].flags.enabled = 1;
1309                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1310                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1311                             handles[j], &power_state);
1312                         if (result || (power_state != ACPI_STATE_D0)) {
1313                                 tz->trips.active[i].flags.enabled = 0;
1314                                 break;
1315                         }
1316                 }
1317                 tz->state.active |= tz->trips.active[i].flags.enabled;
1318         }
1319
1320         acpi_thermal_check(tz);
1321
1322         return AE_OK;
1323 }
1324
1325 static int __init acpi_thermal_init(void)
1326 {
1327         int result = 0;
1328
1329
1330         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1331         if (!acpi_thermal_dir)
1332                 return -ENODEV;
1333         acpi_thermal_dir->owner = THIS_MODULE;
1334
1335         result = acpi_bus_register_driver(&acpi_thermal_driver);
1336         if (result < 0) {
1337                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1338                 return -ENODEV;
1339         }
1340
1341         return 0;
1342 }
1343
1344 static void __exit acpi_thermal_exit(void)
1345 {
1346
1347         acpi_bus_unregister_driver(&acpi_thermal_driver);
1348
1349         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1350
1351         return;
1352 }
1353
1354 module_init(acpi_thermal_init);
1355 module_exit(acpi_thermal_exit);