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/sched.h>
  40 #include <linux/kmod.h>
  41 #include <linux/seq_file.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_THERMAL_COMPONENT          0x04000000
  48 #define ACPI_THERMAL_CLASS              "thermal_zone"
  49 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  50 #define ACPI_THERMAL_FILE_STATE         "state"
  51 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  52 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  53 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  54 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  55 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  56 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  57 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  58 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  59 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  60 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  61 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  62 #define ACPI_THERMAL_MODE_CRITICAL      0xff
  63 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int tzp;
  79 module_param(tzp, int, 0);
  80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  81
  82 static int acpi_thermal_add(struct acpi_device *device);
  83 static int acpi_thermal_remove(struct acpi_device *device, int type);
  84 static int acpi_thermal_resume(struct acpi_device *device);
  85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_trip_points(struct file *,
  89                                               const char __user *, size_t,
  90                                               loff_t *);
  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 struct acpi_driver acpi_thermal_driver = {
 100         .name = "thermal",
 101         .class = ACPI_THERMAL_CLASS,
 102         .ids = ACPI_THERMAL_HID,
 103         .ops = {
 104                 .add = acpi_thermal_add,
 105                 .remove = acpi_thermal_remove,
 106                 .resume = acpi_thermal_resume,
 107                 },
 108 };
 109
 110 struct acpi_thermal_state {
 111         u8 critical:1;
 112         u8 hot:1;
 113         u8 passive:1;
 114         u8 active:1;
 115         u8 reserved:4;
 116         int active_index;
 117 };
 118
 119 struct acpi_thermal_state_flags {
 120         u8 valid:1;
 121         u8 enabled:1;
 122         u8 reserved:6;
 123 };
 124
 125 struct acpi_thermal_critical {
 126         struct acpi_thermal_state_flags flags;
 127         unsigned long temperature;
 128 };
 129
 130 struct acpi_thermal_hot {
 131         struct acpi_thermal_state_flags flags;
 132         unsigned long temperature;
 133 };
 134
 135 struct acpi_thermal_passive {
 136         struct acpi_thermal_state_flags flags;
 137         unsigned long temperature;
 138         unsigned long tc1;
 139         unsigned long tc2;
 140         unsigned long tsp;
 141         struct acpi_handle_list devices;
 142 };
 143
 144 struct acpi_thermal_active {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147         struct acpi_handle_list devices;
 148 };
 149
 150 struct acpi_thermal_trips {
 151         struct acpi_thermal_critical critical;
 152         struct acpi_thermal_hot hot;
 153         struct acpi_thermal_passive passive;
 154         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 155 };
 156
 157 struct acpi_thermal_flags {
 158         u8 cooling_mode:1;      /* _SCP */
 159         u8 devices:1;           /* _TZD */
 160         u8 reserved:6;
 161 };
 162
 163 struct acpi_thermal {
 164         struct acpi_device * device;
 165         acpi_bus_id name;
 166         unsigned long temperature;
 167         unsigned long last_temperature;
 168         unsigned long polling_frequency;
 169         u8 cooling_mode;
 170         volatile u8 zombie;
 171         struct acpi_thermal_flags flags;
 172         struct acpi_thermal_state state;
 173         struct acpi_thermal_trips trips;
 174         struct acpi_handle_list devices;
 175         struct timer_list timer;
 176 };
 177
 178 static const struct file_operations acpi_thermal_state_fops = {
 179         .open = acpi_thermal_state_open_fs,
 180         .read = seq_read,
 181         .llseek = seq_lseek,
 182         .release = single_release,
 183 };
 184
 185 static const struct file_operations acpi_thermal_temp_fops = {
 186         .open = acpi_thermal_temp_open_fs,
 187         .read = seq_read,
 188         .llseek = seq_lseek,
 189         .release = single_release,
 190 };
 191
 192 static const struct file_operations acpi_thermal_trip_fops = {
 193         .open = acpi_thermal_trip_open_fs,
 194         .read = seq_read,
 195         .write = acpi_thermal_write_trip_points,
 196         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static const struct file_operations acpi_thermal_cooling_fops = {
 201         .open = acpi_thermal_cooling_open_fs,
 202         .read = seq_read,
 203         .write = acpi_thermal_write_cooling_mode,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static const struct file_operations acpi_thermal_polling_fops = {
 209         .open = acpi_thermal_polling_open_fs,
 210         .read = seq_read,
 211         .write = acpi_thermal_write_polling,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 /* --------------------------------------------------------------------------
 217                              Thermal Zone Management
 218    -------------------------------------------------------------------------- */
 219
 220 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 221 {
 222         acpi_status status = AE_OK;
 223
 224
 225         if (!tz)
 226                 return -EINVAL;
 227
 228         tz->last_temperature = tz->temperature;
 229
 230         status =
 231             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 232         if (ACPI_FAILURE(status))
 233                 return -ENODEV;
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 236                           tz->temperature));
 237
 238         return 0;
 239 }
 240
 241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         status =
 250             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 251                                   &tz->polling_frequency);
 252         if (ACPI_FAILURE(status))
 253                 return -ENODEV;
 254
 255         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 256                           tz->polling_frequency));
 257
 258         return 0;
 259 }
 260
 261 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 262 {
 263
 264         if (!tz)
 265                 return -EINVAL;
 266
 267         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 268
 269         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 270                           "Polling frequency set to %lu seconds\n",
 271                           tz->polling_frequency));
 272
 273         return 0;
 274 }
 275
 276 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 277 {
 278         acpi_status status = AE_OK;
 279         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 280         struct acpi_object_list arg_list = { 1, &arg0 };
 281         acpi_handle handle = NULL;
 282
 283
 284         if (!tz)
 285                 return -EINVAL;
 286
 287         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 288         if (ACPI_FAILURE(status)) {
 289                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 290                 return -ENODEV;
 291         }
 292
 293         arg0.integer.value = mode;
 294
 295         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 296         if (ACPI_FAILURE(status))
 297                 return -ENODEV;
 298
 299         tz->cooling_mode = mode;
 300
 301         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 302                           mode ? "passive" : "active"));
 303
 304         return 0;
 305 }
 306
 307 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 308 {
 309         acpi_status status = AE_OK;
 310         int i = 0;
 311
 312
 313         if (!tz)
 314                 return -EINVAL;
 315
 316         /* Critical Shutdown (required) */
 317
 318         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 319                                        &tz->trips.critical.temperature);
 320         if (ACPI_FAILURE(status)) {
 321                 tz->trips.critical.flags.valid = 0;
 322                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 323                 return -ENODEV;
 324         } else {
 325                 tz->trips.critical.flags.valid = 1;
 326                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 327                                   "Found critical threshold [%lu]\n",
 328                                   tz->trips.critical.temperature));
 329         }
 330
 331         /* Critical Sleep (optional) */
 332
 333         status =
 334             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 335                                   &tz->trips.hot.temperature);
 336         if (ACPI_FAILURE(status)) {
 337                 tz->trips.hot.flags.valid = 0;
 338                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 339         } else {
 340                 tz->trips.hot.flags.valid = 1;
 341                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 342                                   tz->trips.hot.temperature));
 343         }
 344
 345         /* Passive: Processors (optional) */
 346
 347         status =
 348             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
 349                                   &tz->trips.passive.temperature);
 350         if (ACPI_FAILURE(status)) {
 351                 tz->trips.passive.flags.valid = 0;
 352                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 353         } else {
 354                 tz->trips.passive.flags.valid = 1;
 355
 356                 status =
 357                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 358                                           &tz->trips.passive.tc1);
 359                 if (ACPI_FAILURE(status))
 360                         tz->trips.passive.flags.valid = 0;
 361
 362                 status =
 363                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 364                                           &tz->trips.passive.tc2);
 365                 if (ACPI_FAILURE(status))
 366                         tz->trips.passive.flags.valid = 0;
 367
 368                 status =
 369                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 370                                           &tz->trips.passive.tsp);
 371                 if (ACPI_FAILURE(status))
 372                         tz->trips.passive.flags.valid = 0;
 373
 374                 status =
 375                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 376                                             &tz->trips.passive.devices);
 377                 if (ACPI_FAILURE(status))
 378                         tz->trips.passive.flags.valid = 0;
 379
 380                 if (!tz->trips.passive.flags.valid)
 381                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 382                 else
 383                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 384                                           "Found passive threshold [%lu]\n",
 385                                           tz->trips.passive.temperature));
 386         }
 387
 388         /* Active: Fans, etc. (optional) */
 389
 390         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 391
 392                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 393
 394                 status =
 395                     acpi_evaluate_integer(tz->device->handle, name, NULL,
 396                                           &tz->trips.active[i].temperature);
 397                 if (ACPI_FAILURE(status))
 398                         break;
 399
 400                 name[2] = 'L';
 401                 status =
 402                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 403                                             &tz->trips.active[i].devices);
 404                 if (ACPI_SUCCESS(status)) {
 405                         tz->trips.active[i].flags.valid = 1;
 406                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 407                                           "Found active threshold [%d]:[%lu]\n",
 408                                           i, tz->trips.active[i].temperature));
 409                 } else
 410                         ACPI_EXCEPTION((AE_INFO, status,
 411                                         "Invalid active threshold [%d]", i));
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 418 {
 419         acpi_status status = AE_OK;
 420
 421
 422         if (!tz)
 423                 return -EINVAL;
 424
 425         status =
 426             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 427         if (ACPI_FAILURE(status))
 428                 return -ENODEV;
 429
 430         return 0;
 431 }
 432
 433 static int acpi_thermal_call_usermode(char *path)
 434 {
 435         char *argv[2] = { NULL, NULL };
 436         char *envp[3] = { NULL, NULL, NULL };
 437
 438
 439         if (!path)
 440                 return -EINVAL;
 441
 442         argv[0] = path;
 443
 444         /* minimal command environment */
 445         envp[0] = "HOME=/";
 446         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 447
 448         call_usermodehelper(argv[0], argv, envp, 0);
 449
 450         return 0;
 451 }
 452
 453 static int acpi_thermal_critical(struct acpi_thermal *tz)
 454 {
 455         if (!tz || !tz->trips.critical.flags.valid)
 456                 return -EINVAL;
 457
 458         if (tz->temperature >= tz->trips.critical.temperature) {
 459                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 460                 tz->trips.critical.flags.enabled = 1;
 461         } else if (tz->trips.critical.flags.enabled)
 462                 tz->trips.critical.flags.enabled = 0;
 463
 464         printk(KERN_EMERG
 465                "Critical temperature reached (%ld C), shutting down.\n",
 466                KELVIN_TO_CELSIUS(tz->temperature));
 467         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 468                                 tz->trips.critical.flags.enabled);
 469
 470         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 471
 472         return 0;
 473 }
 474
 475 static int acpi_thermal_hot(struct acpi_thermal *tz)
 476 {
 477         if (!tz || !tz->trips.hot.flags.valid)
 478                 return -EINVAL;
 479
 480         if (tz->temperature >= tz->trips.hot.temperature) {
 481                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 482                 tz->trips.hot.flags.enabled = 1;
 483         } else if (tz->trips.hot.flags.enabled)
 484                 tz->trips.hot.flags.enabled = 0;
 485
 486         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 487                                 tz->trips.hot.flags.enabled);
 488
 489         /* TBD: Call user-mode "sleep(S4)" function */
 490
 491         return 0;
 492 }
 493
 494 static void acpi_thermal_passive(struct acpi_thermal *tz)
 495 {
 496         int result = 1;
 497         struct acpi_thermal_passive *passive = NULL;
 498         int trend = 0;
 499         int i = 0;
 500
 501
 502         if (!tz || !tz->trips.passive.flags.valid)
 503                 return;
 504
 505         passive = &(tz->trips.passive);
 506
 507         /*
 508          * Above Trip?
 509          * -----------
 510          * Calculate the thermal trend (using the passive cooling equation)
 511          * and modify the performance limit for all passive cooling devices
 512          * accordingly.  Note that we assume symmetry.
 513          */
 514         if (tz->temperature >= passive->temperature) {
 515                 trend =
 516                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 517                     (passive->tc2 * (tz->temperature - passive->temperature));
 518                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 519                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 520                                   trend, passive->tc1, tz->temperature,
 521                                   tz->last_temperature, passive->tc2,
 522                                   tz->temperature, passive->temperature));
 523                 passive->flags.enabled = 1;
 524                 /* Heating up? */
 525                 if (trend > 0)
 526                         for (i = 0; i < passive->devices.count; i++)
 527                                 acpi_processor_set_thermal_limit(passive->
 528                                                                  devices.
 529                                                                  handles[i],
 530                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 531                 /* Cooling off? */
 532                 else if (trend < 0) {
 533                         for (i = 0; i < passive->devices.count; i++)
 534                                 /*
 535                                  * assume that we are on highest
 536                                  * freq/lowest thrott and can leave
 537                                  * passive mode, even in error case
 538                                  */
 539                                 if (!acpi_processor_set_thermal_limit
 540                                     (passive->devices.handles[i],
 541                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 542                                         result = 0;
 543                         /*
 544                          * Leave cooling mode, even if the temp might
 545                          * higher than trip point This is because some
 546                          * machines might have long thermal polling
 547                          * frequencies (tsp) defined. We will fall back
 548                          * into passive mode in next cycle (probably quicker)
 549                          */
 550                         if (result) {
 551                                 passive->flags.enabled = 0;
 552                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 553                                                   "Disabling passive cooling, still above threshold,"
 554                                                   " but we are cooling down\n"));
 555                         }
 556                 }
 557                 return;
 558         }
 559
 560         /*
 561          * Below Trip?
 562          * -----------
 563          * Implement passive cooling hysteresis to slowly increase performance
 564          * and avoid thrashing around the passive trip point.  Note that we
 565          * assume symmetry.
 566          */
 567         if (!passive->flags.enabled)
 568                 return;
 569         for (i = 0; i < passive->devices.count; i++)
 570                 if (!acpi_processor_set_thermal_limit
 571                     (passive->devices.handles[i],
 572                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 573                         result = 0;
 574         if (result) {
 575                 passive->flags.enabled = 0;
 576                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 577                                   "Disabling passive cooling (zone is cool)\n"));
 578         }
 579 }
 580
 581 static void acpi_thermal_active(struct acpi_thermal *tz)
 582 {
 583         int result = 0;
 584         struct acpi_thermal_active *active = NULL;
 585         int i = 0;
 586         int j = 0;
 587         unsigned long maxtemp = 0;
 588
 589
 590         if (!tz)
 591                 return;
 592
 593         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 594                 active = &(tz->trips.active[i]);
 595                 if (!active || !active->flags.valid)
 596                         break;
 597                 if (tz->temperature >= active->temperature) {
 598                         /*
 599                          * Above Threshold?
 600                          * ----------------
 601                          * If not already enabled, turn ON all cooling devices
 602                          * associated with this active threshold.
 603                          */
 604                         if (active->temperature > maxtemp)
 605                                 tz->state.active_index = i;
 606                         maxtemp = active->temperature;
 607                         if (active->flags.enabled)
 608                                 continue;
 609                         for (j = 0; j < active->devices.count; j++) {
 610                                 result =
 611                                     acpi_bus_set_power(active->devices.
 612                                                        handles[j],
 613                                                        ACPI_STATE_D0);
 614                                 if (result) {
 615                                         printk(KERN_WARNING PREFIX
 616                                                       "Unable to turn cooling device [%p] 'on'\n",
 617                                                       active->devices.
 618                                                       handles[j]);
 619                                         continue;
 620                                 }
 621                                 active->flags.enabled = 1;
 622                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 623                                                   "Cooling device [%p] now 'on'\n",
 624                                                   active->devices.handles[j]));
 625                         }
 626                         continue;
 627                 }
 628                 if (!active->flags.enabled)
 629                         continue;
 630                 /*
 631                  * Below Threshold?
 632                  * ----------------
 633                  * Turn OFF all cooling devices associated with this
 634                  * threshold.
 635                  */
 636                 for (j = 0; j < active->devices.count; j++) {
 637                         result = acpi_bus_set_power(active->devices.handles[j],
 638                                                     ACPI_STATE_D3);
 639                         if (result) {
 640                                 printk(KERN_WARNING PREFIX
 641                                               "Unable to turn cooling device [%p] 'off'\n",
 642                                               active->devices.handles[j]);
 643                                 continue;
 644                         }
 645                         active->flags.enabled = 0;
 646                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 647                                           "Cooling device [%p] now 'off'\n",
 648                                           active->devices.handles[j]));
 649                 }
 650         }
 651 }
 652
 653 static void acpi_thermal_check(void *context);
 654
 655 static void acpi_thermal_run(unsigned long data)
 656 {
 657         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 658         if (!tz->zombie)
 659                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 660 }
 661
 662 static void acpi_thermal_check(void *data)
 663 {
 664         int result = 0;
 665         struct acpi_thermal *tz = data;
 666         unsigned long sleep_time = 0;
 667         int i = 0;
 668         struct acpi_thermal_state state;
 669
 670
 671         if (!tz) {
 672                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 673                 return;
 674         }
 675
 676         state = tz->state;
 677
 678         result = acpi_thermal_get_temperature(tz);
 679         if (result)
 680                 return;
 681
 682         memset(&tz->state, 0, sizeof(tz->state));
 683
 684         /*
 685          * Check Trip Points
 686          * -----------------
 687          * Compare the current temperature to the trip point values to see
 688          * if we've entered one of the thermal policy states.  Note that
 689          * this function determines when a state is entered, but the
 690          * individual policy decides when it is exited (e.g. hysteresis).
 691          */
 692         if (tz->trips.critical.flags.valid)
 693                 state.critical |=
 694                     (tz->temperature >= tz->trips.critical.temperature);
 695         if (tz->trips.hot.flags.valid)
 696                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 697         if (tz->trips.passive.flags.valid)
 698                 state.passive |=
 699                     (tz->temperature >= tz->trips.passive.temperature);
 700         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 701                 if (tz->trips.active[i].flags.valid)
 702                         state.active |=
 703                             (tz->temperature >=
 704                              tz->trips.active[i].temperature);
 705
 706         /*
 707          * Invoke Policy
 708          * -------------
 709          * Separated from the above check to allow individual policy to
 710          * determine when to exit a given state.
 711          */
 712         if (state.critical)
 713                 acpi_thermal_critical(tz);
 714         if (state.hot)
 715                 acpi_thermal_hot(tz);
 716         if (state.passive)
 717                 acpi_thermal_passive(tz);
 718         if (state.active)
 719                 acpi_thermal_active(tz);
 720
 721         /*
 722          * Calculate State
 723          * ---------------
 724          * Again, separated from the above two to allow independent policy
 725          * decisions.
 726          */
 727         tz->state.critical = tz->trips.critical.flags.enabled;
 728         tz->state.hot = tz->trips.hot.flags.enabled;
 729         tz->state.passive = tz->trips.passive.flags.enabled;
 730         tz->state.active = 0;
 731         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 732                 tz->state.active |= tz->trips.active[i].flags.enabled;
 733
 734         /*
 735          * Calculate Sleep Time
 736          * --------------------
 737          * If we're in the passive state, use _TSP's value.  Otherwise
 738          * use the default polling frequency (e.g. _TZP).  If no polling
 739          * frequency is specified then we'll wait forever (at least until
 740          * a thermal event occurs).  Note that _TSP and _TZD values are
 741          * given in 1/10th seconds (we must covert to milliseconds).
 742          */
 743         if (tz->state.passive)
 744                 sleep_time = tz->trips.passive.tsp * 100;
 745         else if (tz->polling_frequency > 0)
 746                 sleep_time = tz->polling_frequency * 100;
 747
 748         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 749                           tz->name, tz->temperature, sleep_time));
 750
 751         /*
 752          * Schedule Next Poll
 753          * ------------------
 754          */
 755         if (!sleep_time) {
 756                 if (timer_pending(&(tz->timer)))
 757                         del_timer(&(tz->timer));
 758         } else {
 759                 if (timer_pending(&(tz->timer)))
 760                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 761                 else {
 762                         tz->timer.data = (unsigned long)tz;
 763                         tz->timer.function = acpi_thermal_run;
 764                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 765                         add_timer(&(tz->timer));
 766                 }
 767         }
 768
 769         return;
 770 }
 771
 772 /* --------------------------------------------------------------------------
 773                               FS Interface (/proc)
 774    -------------------------------------------------------------------------- */
 775
 776 static struct proc_dir_entry *acpi_thermal_dir;
 777
 778 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 779 {
 780         struct acpi_thermal *tz = seq->private;
 781
 782
 783         if (!tz)
 784                 goto end;
 785
 786         seq_puts(seq, "state:                   ");
 787
 788         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 789             && !tz->state.active)
 790                 seq_puts(seq, "ok\n");
 791         else {
 792                 if (tz->state.critical)
 793                         seq_puts(seq, "critical ");
 794                 if (tz->state.hot)
 795                         seq_puts(seq, "hot ");
 796                 if (tz->state.passive)
 797                         seq_puts(seq, "passive ");
 798                 if (tz->state.active)
 799                         seq_printf(seq, "active[%d]", tz->state.active_index);
 800                 seq_puts(seq, "\n");
 801         }
 802
 803       end:
 804         return 0;
 805 }
 806
 807 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 808 {
 809         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 810 }
 811
 812 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 813 {
 814         int result = 0;
 815         struct acpi_thermal *tz = seq->private;
 816
 817
 818         if (!tz)
 819                 goto end;
 820
 821         result = acpi_thermal_get_temperature(tz);
 822         if (result)
 823                 goto end;
 824
 825         seq_printf(seq, "temperature:             %ld C\n",
 826                    KELVIN_TO_CELSIUS(tz->temperature));
 827
 828       end:
 829         return 0;
 830 }
 831
 832 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 833 {
 834         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 835 }
 836
 837 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 838 {
 839         struct acpi_thermal *tz = seq->private;
 840         int i = 0;
 841         int j = 0;
 842
 843
 844         if (!tz)
 845                 goto end;
 846
 847         if (tz->trips.critical.flags.valid)
 848                 seq_printf(seq, "critical (S5):           %ld C\n",
 849                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 850
 851         if (tz->trips.hot.flags.valid)
 852                 seq_printf(seq, "hot (S4):                %ld C\n",
 853                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 854
 855         if (tz->trips.passive.flags.valid) {
 856                 seq_printf(seq,
 857                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 858                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 859                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 860                            tz->trips.passive.tsp);
 861                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 862
 863                         seq_printf(seq, "0x%p ",
 864                                    tz->trips.passive.devices.handles[j]);
 865                 }
 866                 seq_puts(seq, "\n");
 867         }
 868
 869         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 870                 if (!(tz->trips.active[i].flags.valid))
 871                         break;
 872                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 873                            i,
 874                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 875                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 876                         seq_printf(seq, "0x%p ",
 877                                    tz->trips.active[i].devices.handles[j]);
 878                 seq_puts(seq, "\n");
 879         }
 880
 881       end:
 882         return 0;
 883 }
 884
 885 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 886 {
 887         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 888 }
 889
 890 static ssize_t
 891 acpi_thermal_write_trip_points(struct file *file,
 892                                const char __user * buffer,
 893                                size_t count, loff_t * ppos)
 894 {
 895         struct seq_file *m = file->private_data;
 896         struct acpi_thermal *tz = m->private;
 897
 898         char *limit_string;
 899         int num, critical, hot, passive;
 900         int *active;
 901         int i = 0;
 902
 903
 904         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 905         if (!limit_string)
 906                 return -ENOMEM;
 907
 908         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 909         if (!active) {
 910                 kfree(limit_string);
 911                 return -ENOMEM;
 912         }
 913
 914         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 915                 count = -EINVAL;
 916                 goto end;
 917         }
 918
 919         if (copy_from_user(limit_string, buffer, count)) {
 920                 count = -EFAULT;
 921                 goto end;
 922         }
 923
 924         limit_string[count] = '\0';
 925
 926         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 927                      &critical, &hot, &passive,
 928                      &active[0], &active[1], &active[2], &active[3], &active[4],
 929                      &active[5], &active[6], &active[7], &active[8],
 930                      &active[9]);
 931         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 932                 count = -EINVAL;
 933                 goto end;
 934         }
 935
 936         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 937         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 938         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 939         for (i = 0; i < num - 3; i++) {
 940                 if (!(tz->trips.active[i].flags.valid))
 941                         break;
 942                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 943         }
 944
 945       end:
 946         kfree(active);
 947         kfree(limit_string);
 948         return count;
 949 }
 950
 951 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 952 {
 953         struct acpi_thermal *tz = seq->private;
 954
 955
 956         if (!tz)
 957                 goto end;
 958
 959         if (!tz->flags.cooling_mode) {
 960                 seq_puts(seq, "<setting not supported>\n");
 961         }
 962
 963         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 964                 seq_printf(seq, "cooling mode:  critical\n");
 965         else
 966                 seq_printf(seq, "cooling mode:  %s\n",
 967                            tz->cooling_mode ? "passive" : "active");
 968
 969       end:
 970         return 0;
 971 }
 972
 973 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 974 {
 975         return single_open(file, acpi_thermal_cooling_seq_show,
 976                            PDE(inode)->data);
 977 }
 978
 979 static ssize_t
 980 acpi_thermal_write_cooling_mode(struct file *file,
 981                                 const char __user * buffer,
 982                                 size_t count, loff_t * ppos)
 983 {
 984         struct seq_file *m = file->private_data;
 985         struct acpi_thermal *tz = m->private;
 986         int result = 0;
 987         char mode_string[12] = { '\0' };
 988
 989
 990         if (!tz || (count > sizeof(mode_string) - 1))
 991                 return -EINVAL;
 992
 993         if (!tz->flags.cooling_mode)
 994                 return -ENODEV;
 995
 996         if (copy_from_user(mode_string, buffer, count))
 997                 return -EFAULT;
 998
 999         mode_string[count] = '\0';
1000
1001         result = acpi_thermal_set_cooling_mode(tz,
1002                                                simple_strtoul(mode_string, NULL,
1003                                                               0));
1004         if (result)
1005                 return result;
1006
1007         acpi_thermal_check(tz);
1008
1009         return count;
1010 }
1011
1012 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1013 {
1014         struct acpi_thermal *tz = seq->private;
1015
1016
1017         if (!tz)
1018                 goto end;
1019
1020         if (!tz->polling_frequency) {
1021                 seq_puts(seq, "<polling disabled>\n");
1022                 goto end;
1023         }
1024
1025         seq_printf(seq, "polling frequency:       %lu seconds\n",
1026                    (tz->polling_frequency / 10));
1027
1028       end:
1029         return 0;
1030 }
1031
1032 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1033 {
1034         return single_open(file, acpi_thermal_polling_seq_show,
1035                            PDE(inode)->data);
1036 }
1037
1038 static ssize_t
1039 acpi_thermal_write_polling(struct file *file,
1040                            const char __user * buffer,
1041                            size_t count, loff_t * ppos)
1042 {
1043         struct seq_file *m = file->private_data;
1044         struct acpi_thermal *tz = m->private;
1045         int result = 0;
1046         char polling_string[12] = { '\0' };
1047         int seconds = 0;
1048
1049
1050         if (!tz || (count > sizeof(polling_string) - 1))
1051                 return -EINVAL;
1052
1053         if (copy_from_user(polling_string, buffer, count))
1054                 return -EFAULT;
1055
1056         polling_string[count] = '\0';
1057
1058         seconds = simple_strtoul(polling_string, NULL, 0);
1059
1060         result = acpi_thermal_set_polling(tz, seconds);
1061         if (result)
1062                 return result;
1063
1064         acpi_thermal_check(tz);
1065
1066         return count;
1067 }
1068
1069 static int acpi_thermal_add_fs(struct acpi_device *device)
1070 {
1071         struct proc_dir_entry *entry = NULL;
1072
1073
1074         if (!acpi_device_dir(device)) {
1075                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1076                                                      acpi_thermal_dir);
1077                 if (!acpi_device_dir(device))
1078                         return -ENODEV;
1079                 acpi_device_dir(device)->owner = THIS_MODULE;
1080         }
1081
1082         /* 'state' [R] */
1083         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1084                                   S_IRUGO, acpi_device_dir(device));
1085         if (!entry)
1086                 return -ENODEV;
1087         else {
1088                 entry->proc_fops = &acpi_thermal_state_fops;
1089                 entry->data = acpi_driver_data(device);
1090                 entry->owner = THIS_MODULE;
1091         }
1092
1093         /* 'temperature' [R] */
1094         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1095                                   S_IRUGO, acpi_device_dir(device));
1096         if (!entry)
1097                 return -ENODEV;
1098         else {
1099                 entry->proc_fops = &acpi_thermal_temp_fops;
1100                 entry->data = acpi_driver_data(device);
1101                 entry->owner = THIS_MODULE;
1102         }
1103
1104         /* 'trip_points' [R/W] */
1105         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1106                                   S_IFREG | S_IRUGO | S_IWUSR,
1107                                   acpi_device_dir(device));
1108         if (!entry)
1109                 return -ENODEV;
1110         else {
1111                 entry->proc_fops = &acpi_thermal_trip_fops;
1112                 entry->data = acpi_driver_data(device);
1113                 entry->owner = THIS_MODULE;
1114         }
1115
1116         /* 'cooling_mode' [R/W] */
1117         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1118                                   S_IFREG | S_IRUGO | S_IWUSR,
1119                                   acpi_device_dir(device));
1120         if (!entry)
1121                 return -ENODEV;
1122         else {
1123                 entry->proc_fops = &acpi_thermal_cooling_fops;
1124                 entry->data = acpi_driver_data(device);
1125                 entry->owner = THIS_MODULE;
1126         }
1127
1128         /* 'polling_frequency' [R/W] */
1129         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1130                                   S_IFREG | S_IRUGO | S_IWUSR,
1131                                   acpi_device_dir(device));
1132         if (!entry)
1133                 return -ENODEV;
1134         else {
1135                 entry->proc_fops = &acpi_thermal_polling_fops;
1136                 entry->data = acpi_driver_data(device);
1137                 entry->owner = THIS_MODULE;
1138         }
1139
1140         return 0;
1141 }
1142
1143 static int acpi_thermal_remove_fs(struct acpi_device *device)
1144 {
1145
1146         if (acpi_device_dir(device)) {
1147                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1148                                   acpi_device_dir(device));
1149                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1154                                   acpi_device_dir(device));
1155                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1156                                   acpi_device_dir(device));
1157                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1158                 acpi_device_dir(device) = NULL;
1159         }
1160
1161         return 0;
1162 }
1163
1164 /* --------------------------------------------------------------------------
1165                                  Driver Interface
1166    -------------------------------------------------------------------------- */
1167
1168 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1169 {
1170         struct acpi_thermal *tz = data;
1171         struct acpi_device *device = NULL;
1172
1173
1174         if (!tz)
1175                 return;
1176
1177         device = tz->device;
1178
1179         switch (event) {
1180         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1181                 acpi_thermal_check(tz);
1182                 break;
1183         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1184                 acpi_thermal_get_trip_points(tz);
1185                 acpi_thermal_check(tz);
1186                 acpi_bus_generate_event(device, event, 0);
1187                 break;
1188         case ACPI_THERMAL_NOTIFY_DEVICES:
1189                 if (tz->flags.devices)
1190                         acpi_thermal_get_devices(tz);
1191                 acpi_bus_generate_event(device, event, 0);
1192                 break;
1193         default:
1194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1195                                   "Unsupported event [0x%x]\n", event));
1196                 break;
1197         }
1198
1199         return;
1200 }
1201
1202 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1203 {
1204         int result = 0;
1205
1206
1207         if (!tz)
1208                 return -EINVAL;
1209
1210         /* Get temperature [_TMP] (required) */
1211         result = acpi_thermal_get_temperature(tz);
1212         if (result)
1213                 return result;
1214
1215         /* Get trip points [_CRT, _PSV, etc.] (required) */
1216         result = acpi_thermal_get_trip_points(tz);
1217         if (result)
1218                 return result;
1219
1220         /* Set the cooling mode [_SCP] to active cooling (default) */
1221         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1222         if (!result)
1223                 tz->flags.cooling_mode = 1;
1224         else {
1225                 /* Oh,we have not _SCP method.
1226                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1227                 tz->flags.cooling_mode = 0;
1228                 if (tz->trips.active[0].flags.valid
1229                     && tz->trips.passive.flags.valid) {
1230                         if (tz->trips.passive.temperature >
1231                             tz->trips.active[0].temperature)
1232                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1233                         else
1234                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1235                 } else if (!tz->trips.active[0].flags.valid
1236                            && tz->trips.passive.flags.valid) {
1237                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1238                 } else if (tz->trips.active[0].flags.valid
1239                            && !tz->trips.passive.flags.valid) {
1240                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1241                 } else {
1242                         /* _ACx and _PSV are optional, but _CRT is required */
1243                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1244                 }
1245         }
1246
1247         /* Get default polling frequency [_TZP] (optional) */
1248         if (tzp)
1249                 tz->polling_frequency = tzp;
1250         else
1251                 acpi_thermal_get_polling_frequency(tz);
1252
1253         /* Get devices in this thermal zone [_TZD] (optional) */
1254         result = acpi_thermal_get_devices(tz);
1255         if (!result)
1256                 tz->flags.devices = 1;
1257
1258         return 0;
1259 }
1260
1261 static int acpi_thermal_add(struct acpi_device *device)
1262 {
1263         int result = 0;
1264         acpi_status status = AE_OK;
1265         struct acpi_thermal *tz = NULL;
1266
1267
1268         if (!device)
1269                 return -EINVAL;
1270
1271         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1272         if (!tz)
1273                 return -ENOMEM;
1274
1275         tz->device = device;
1276         strcpy(tz->name, device->pnp.bus_id);
1277         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1278         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1279         acpi_driver_data(device) = tz;
1280
1281         result = acpi_thermal_get_info(tz);
1282         if (result)
1283                 goto end;
1284
1285         result = acpi_thermal_add_fs(device);
1286         if (result)
1287                 goto end;
1288
1289         init_timer(&tz->timer);
1290
1291         acpi_thermal_check(tz);
1292
1293         status = acpi_install_notify_handler(device->handle,
1294                                              ACPI_DEVICE_NOTIFY,
1295                                              acpi_thermal_notify, tz);
1296         if (ACPI_FAILURE(status)) {
1297                 result = -ENODEV;
1298                 goto end;
1299         }
1300
1301         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1302                acpi_device_name(device), acpi_device_bid(device),
1303                KELVIN_TO_CELSIUS(tz->temperature));
1304
1305       end:
1306         if (result) {
1307                 acpi_thermal_remove_fs(device);
1308                 kfree(tz);
1309         }
1310
1311         return result;
1312 }
1313
1314 static int acpi_thermal_remove(struct acpi_device *device, int type)
1315 {
1316         acpi_status status = AE_OK;
1317         struct acpi_thermal *tz = NULL;
1318
1319
1320         if (!device || !acpi_driver_data(device))
1321                 return -EINVAL;
1322
1323         tz = acpi_driver_data(device);
1324
1325         /* avoid timer adding new defer task */
1326         tz->zombie = 1;
1327         /* wait for running timer (on other CPUs) finish */
1328         del_timer_sync(&(tz->timer));
1329         /* synchronize deferred task */
1330         acpi_os_wait_events_complete(NULL);
1331         /* deferred task may reinsert timer */
1332         del_timer_sync(&(tz->timer));
1333
1334         status = acpi_remove_notify_handler(device->handle,
1335                                             ACPI_DEVICE_NOTIFY,
1336                                             acpi_thermal_notify);
1337
1338         /* Terminate policy */
1339         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1340                 tz->trips.passive.flags.enabled = 0;
1341                 acpi_thermal_passive(tz);
1342         }
1343         if (tz->trips.active[0].flags.valid
1344             && tz->trips.active[0].flags.enabled) {
1345                 tz->trips.active[0].flags.enabled = 0;
1346                 acpi_thermal_active(tz);
1347         }
1348
1349         acpi_thermal_remove_fs(device);
1350
1351         kfree(tz);
1352         return 0;
1353 }
1354
1355 static int acpi_thermal_resume(struct acpi_device *device)
1356 {
1357         struct acpi_thermal *tz = NULL;
1358         int i;
1359
1360         if (!device || !acpi_driver_data(device))
1361                 return -EINVAL;
1362
1363         tz = acpi_driver_data(device);
1364
1365         acpi_thermal_get_temperature(tz);
1366
1367         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1368                 if (tz->trips.active[i].flags.valid) {
1369                         tz->temperature = tz->trips.active[i].temperature;
1370                         tz->trips.active[i].flags.enabled = 0;
1371
1372                         acpi_thermal_active(tz);
1373
1374                         tz->state.active |= tz->trips.active[i].flags.enabled;
1375                         tz->state.active_index = i;
1376                 }
1377         }
1378
1379         acpi_thermal_check(tz);
1380
1381         return AE_OK;
1382 }
1383
1384 static int __init acpi_thermal_init(void)
1385 {
1386         int result = 0;
1387
1388
1389         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1390         if (!acpi_thermal_dir)
1391                 return -ENODEV;
1392         acpi_thermal_dir->owner = THIS_MODULE;
1393
1394         result = acpi_bus_register_driver(&acpi_thermal_driver);
1395         if (result < 0) {
1396                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1397                 return -ENODEV;
1398         }
1399
1400         return 0;
1401 }
1402
1403 static void __exit acpi_thermal_exit(void)
1404 {
1405
1406         acpi_bus_unregister_driver(&acpi_thermal_driver);
1407
1408         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1409
1410         return;
1411 }
1412
1413 module_init(acpi_thermal_init);
1414 module_exit(acpi_thermal_exit);