drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/timer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <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_DRIVER_NAME        "ACPI Thermal Zone Driver"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  64 #define ACPI_THERMAL_MODE_CRITICAL      0xff
  65 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  66
  67 #define ACPI_THERMAL_MAX_ACTIVE 10
  68 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  69
  70 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  71 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  72
  73 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  74 ACPI_MODULE_NAME("acpi_thermal")
  75
  76 MODULE_AUTHOR("Paul Diefenbaugh");
  77 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  78 MODULE_LICENSE("GPL");
  79
  80 static int tzp;
  81 module_param(tzp, int, 0);
  82 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  83
  84 static int acpi_thermal_add(struct acpi_device *device);
  85 static int acpi_thermal_remove(struct acpi_device *device, int type);
  86 static int acpi_thermal_resume(struct acpi_device *device);
  87 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  88 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  89 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  90 static ssize_t acpi_thermal_write_trip_points(struct file *,
  91                                               const char __user *, size_t,
  92                                               loff_t *);
  93 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  94 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  95                                                const char __user *, size_t,
  96                                                loff_t *);
  97 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  98 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  99                                           size_t, loff_t *);
 100
 101 static struct acpi_driver acpi_thermal_driver = {
 102         .name = ACPI_THERMAL_DRIVER_NAME,
 103         .class = ACPI_THERMAL_CLASS,
 104         .ids = ACPI_THERMAL_HID,
 105         .ops = {
 106                 .add = acpi_thermal_add,
 107                 .remove = acpi_thermal_remove,
 108                 .resume = acpi_thermal_resume,
 109                 },
 110 };
 111
 112 struct acpi_thermal_state {
 113         u8 critical:1;
 114         u8 hot:1;
 115         u8 passive:1;
 116         u8 active:1;
 117         u8 reserved:4;
 118         int active_index;
 119 };
 120
 121 struct acpi_thermal_state_flags {
 122         u8 valid:1;
 123         u8 enabled:1;
 124         u8 reserved:6;
 125 };
 126
 127 struct acpi_thermal_critical {
 128         struct acpi_thermal_state_flags flags;
 129         unsigned long temperature;
 130 };
 131
 132 struct acpi_thermal_hot {
 133         struct acpi_thermal_state_flags flags;
 134         unsigned long temperature;
 135 };
 136
 137 struct acpi_thermal_passive {
 138         struct acpi_thermal_state_flags flags;
 139         unsigned long temperature;
 140         unsigned long tc1;
 141         unsigned long tc2;
 142         unsigned long tsp;
 143         struct acpi_handle_list devices;
 144 };
 145
 146 struct acpi_thermal_active {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149         struct acpi_handle_list devices;
 150 };
 151
 152 struct acpi_thermal_trips {
 153         struct acpi_thermal_critical critical;
 154         struct acpi_thermal_hot hot;
 155         struct acpi_thermal_passive passive;
 156         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 157 };
 158
 159 struct acpi_thermal_flags {
 160         u8 cooling_mode:1;      /* _SCP */
 161         u8 devices:1;           /* _TZD */
 162         u8 reserved:6;
 163 };
 164
 165 struct acpi_thermal {
 166         struct acpi_device * device;
 167         acpi_bus_id name;
 168         unsigned long temperature;
 169         unsigned long last_temperature;
 170         unsigned long polling_frequency;
 171         u8 cooling_mode;
 172         volatile u8 zombie;
 173         struct acpi_thermal_flags flags;
 174         struct acpi_thermal_state state;
 175         struct acpi_thermal_trips trips;
 176         struct acpi_handle_list devices;
 177         struct timer_list timer;
 178 };
 179
 180 static const struct file_operations acpi_thermal_state_fops = {
 181         .open = acpi_thermal_state_open_fs,
 182         .read = seq_read,
 183         .llseek = seq_lseek,
 184         .release = single_release,
 185 };
 186
 187 static const struct file_operations acpi_thermal_temp_fops = {
 188         .open = acpi_thermal_temp_open_fs,
 189         .read = seq_read,
 190         .llseek = seq_lseek,
 191         .release = single_release,
 192 };
 193
 194 static const struct file_operations acpi_thermal_trip_fops = {
 195         .open = acpi_thermal_trip_open_fs,
 196         .read = seq_read,
 197         .write = acpi_thermal_write_trip_points,
 198         .llseek = seq_lseek,
 199         .release = single_release,
 200 };
 201
 202 static const struct file_operations acpi_thermal_cooling_fops = {
 203         .open = acpi_thermal_cooling_open_fs,
 204         .read = seq_read,
 205         .write = acpi_thermal_write_cooling_mode,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 static const struct file_operations acpi_thermal_polling_fops = {
 211         .open = acpi_thermal_polling_open_fs,
 212         .read = seq_read,
 213         .write = acpi_thermal_write_polling,
 214         .llseek = seq_lseek,
 215         .release = single_release,
 216 };
 217
 218 /* --------------------------------------------------------------------------
 219                              Thermal Zone Management
 220    -------------------------------------------------------------------------- */
 221
 222 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 223 {
 224         acpi_status status = AE_OK;
 225
 226
 227         if (!tz)
 228                 return -EINVAL;
 229
 230         tz->last_temperature = tz->temperature;
 231
 232         status =
 233             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 234         if (ACPI_FAILURE(status))
 235                 return -ENODEV;
 236
 237         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 238                           tz->temperature));
 239
 240         return 0;
 241 }
 242
 243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 244 {
 245         acpi_status status = AE_OK;
 246
 247
 248         if (!tz)
 249                 return -EINVAL;
 250
 251         status =
 252             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 253                                   &tz->polling_frequency);
 254         if (ACPI_FAILURE(status))
 255                 return -ENODEV;
 256
 257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 258                           tz->polling_frequency));
 259
 260         return 0;
 261 }
 262
 263 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 264 {
 265
 266         if (!tz)
 267                 return -EINVAL;
 268
 269         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 272                           "Polling frequency set to %lu seconds\n",
 273                           tz->polling_frequency));
 274
 275         return 0;
 276 }
 277
 278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 279 {
 280         acpi_status status = AE_OK;
 281         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 282         struct acpi_object_list arg_list = { 1, &arg0 };
 283         acpi_handle handle = NULL;
 284
 285
 286         if (!tz)
 287                 return -EINVAL;
 288
 289         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 290         if (ACPI_FAILURE(status)) {
 291                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 292                 return -ENODEV;
 293         }
 294
 295         arg0.integer.value = mode;
 296
 297         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 298         if (ACPI_FAILURE(status))
 299                 return -ENODEV;
 300
 301         tz->cooling_mode = mode;
 302
 303         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 304                           mode ? "passive" : "active"));
 305
 306         return 0;
 307 }
 308
 309 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 310 {
 311         acpi_status status = AE_OK;
 312         int i = 0;
 313
 314
 315         if (!tz)
 316                 return -EINVAL;
 317
 318         /* Critical Shutdown (required) */
 319
 320         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 321                                        &tz->trips.critical.temperature);
 322         if (ACPI_FAILURE(status)) {
 323                 tz->trips.critical.flags.valid = 0;
 324                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 325                 return -ENODEV;
 326         } else {
 327                 tz->trips.critical.flags.valid = 1;
 328                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 329                                   "Found critical threshold [%lu]\n",
 330                                   tz->trips.critical.temperature));
 331         }
 332
 333         /* Critical Sleep (optional) */
 334
 335         status =
 336             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 337                                   &tz->trips.hot.temperature);
 338         if (ACPI_FAILURE(status)) {
 339                 tz->trips.hot.flags.valid = 0;
 340                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 341         } else {
 342                 tz->trips.hot.flags.valid = 1;
 343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 344                                   tz->trips.hot.temperature));
 345         }
 346
 347         /* Passive: Processors (optional) */
 348
 349         status =
 350             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
 351                                   &tz->trips.passive.temperature);
 352         if (ACPI_FAILURE(status)) {
 353                 tz->trips.passive.flags.valid = 0;
 354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 355         } else {
 356                 tz->trips.passive.flags.valid = 1;
 357
 358                 status =
 359                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 360                                           &tz->trips.passive.tc1);
 361                 if (ACPI_FAILURE(status))
 362                         tz->trips.passive.flags.valid = 0;
 363
 364                 status =
 365                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 366                                           &tz->trips.passive.tc2);
 367                 if (ACPI_FAILURE(status))
 368                         tz->trips.passive.flags.valid = 0;
 369
 370                 status =
 371                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 372                                           &tz->trips.passive.tsp);
 373                 if (ACPI_FAILURE(status))
 374                         tz->trips.passive.flags.valid = 0;
 375
 376                 status =
 377                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 378                                             &tz->trips.passive.devices);
 379                 if (ACPI_FAILURE(status))
 380                         tz->trips.passive.flags.valid = 0;
 381
 382                 if (!tz->trips.passive.flags.valid)
 383                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 384                 else
 385                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 386                                           "Found passive threshold [%lu]\n",
 387                                           tz->trips.passive.temperature));
 388         }
 389
 390         /* Active: Fans, etc. (optional) */
 391
 392         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 393
 394                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 395
 396                 status =
 397                     acpi_evaluate_integer(tz->device->handle, name, NULL,
 398                                           &tz->trips.active[i].temperature);
 399                 if (ACPI_FAILURE(status))
 400                         break;
 401
 402                 name[2] = 'L';
 403                 status =
 404                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 405                                             &tz->trips.active[i].devices);
 406                 if (ACPI_SUCCESS(status)) {
 407                         tz->trips.active[i].flags.valid = 1;
 408                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 409                                           "Found active threshold [%d]:[%lu]\n",
 410                                           i, tz->trips.active[i].temperature));
 411                 } else
 412                         ACPI_EXCEPTION((AE_INFO, status,
 413                                         "Invalid active threshold [%d]", i));
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 420 {
 421         acpi_status status = AE_OK;
 422
 423
 424         if (!tz)
 425                 return -EINVAL;
 426
 427         status =
 428             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 429         if (ACPI_FAILURE(status))
 430                 return -ENODEV;
 431
 432         return 0;
 433 }
 434
 435 static int acpi_thermal_call_usermode(char *path)
 436 {
 437         char *argv[2] = { NULL, NULL };
 438         char *envp[3] = { NULL, NULL, NULL };
 439
 440
 441         if (!path)
 442                 return -EINVAL;
 443
 444         argv[0] = path;
 445
 446         /* minimal command environment */
 447         envp[0] = "HOME=/";
 448         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 449
 450         call_usermodehelper(argv[0], argv, envp, 0);
 451
 452         return 0;
 453 }
 454
 455 static int acpi_thermal_critical(struct acpi_thermal *tz)
 456 {
 457         if (!tz || !tz->trips.critical.flags.valid)
 458                 return -EINVAL;
 459
 460         if (tz->temperature >= tz->trips.critical.temperature) {
 461                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 462                 tz->trips.critical.flags.enabled = 1;
 463         } else if (tz->trips.critical.flags.enabled)
 464                 tz->trips.critical.flags.enabled = 0;
 465
 466         printk(KERN_EMERG
 467                "Critical temperature reached (%ld C), shutting down.\n",
 468                KELVIN_TO_CELSIUS(tz->temperature));
 469         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 470                                 tz->trips.critical.flags.enabled);
 471
 472         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 473
 474         return 0;
 475 }
 476
 477 static int acpi_thermal_hot(struct acpi_thermal *tz)
 478 {
 479         if (!tz || !tz->trips.hot.flags.valid)
 480                 return -EINVAL;
 481
 482         if (tz->temperature >= tz->trips.hot.temperature) {
 483                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 484                 tz->trips.hot.flags.enabled = 1;
 485         } else if (tz->trips.hot.flags.enabled)
 486                 tz->trips.hot.flags.enabled = 0;
 487
 488         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 489                                 tz->trips.hot.flags.enabled);
 490
 491         /* TBD: Call user-mode "sleep(S4)" function */
 492
 493         return 0;
 494 }
 495
 496 static void acpi_thermal_passive(struct acpi_thermal *tz)
 497 {
 498         int result = 1;
 499         struct acpi_thermal_passive *passive = NULL;
 500         int trend = 0;
 501         int i = 0;
 502
 503
 504         if (!tz || !tz->trips.passive.flags.valid)
 505                 return;
 506
 507         passive = &(tz->trips.passive);
 508
 509         /*
 510          * Above Trip?
 511          * -----------
 512          * Calculate the thermal trend (using the passive cooling equation)
 513          * and modify the performance limit for all passive cooling devices
 514          * accordingly.  Note that we assume symmetry.
 515          */
 516         if (tz->temperature >= passive->temperature) {
 517                 trend =
 518                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 519                     (passive->tc2 * (tz->temperature - passive->temperature));
 520                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 521                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 522                                   trend, passive->tc1, tz->temperature,
 523                                   tz->last_temperature, passive->tc2,
 524                                   tz->temperature, passive->temperature));
 525                 passive->flags.enabled = 1;
 526                 /* Heating up? */
 527                 if (trend > 0)
 528                         for (i = 0; i < passive->devices.count; i++)
 529                                 acpi_processor_set_thermal_limit(passive->
 530                                                                  devices.
 531                                                                  handles[i],
 532                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 533                 /* Cooling off? */
 534                 else if (trend < 0) {
 535                         for (i = 0; i < passive->devices.count; i++)
 536                                 /*
 537                                  * assume that we are on highest
 538                                  * freq/lowest thrott and can leave
 539                                  * passive mode, even in error case
 540                                  */
 541                                 if (!acpi_processor_set_thermal_limit
 542                                     (passive->devices.handles[i],
 543                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 544                                         result = 0;
 545                         /*
 546                          * Leave cooling mode, even if the temp might
 547                          * higher than trip point This is because some
 548                          * machines might have long thermal polling
 549                          * frequencies (tsp) defined. We will fall back
 550                          * into passive mode in next cycle (probably quicker)
 551                          */
 552                         if (result) {
 553                                 passive->flags.enabled = 0;
 554                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 555                                                   "Disabling passive cooling, still above threshold,"
 556                                                   " but we are cooling down\n"));
 557                         }
 558                 }
 559                 return;
 560         }
 561
 562         /*
 563          * Below Trip?
 564          * -----------
 565          * Implement passive cooling hysteresis to slowly increase performance
 566          * and avoid thrashing around the passive trip point.  Note that we
 567          * assume symmetry.
 568          */
 569         if (!passive->flags.enabled)
 570                 return;
 571         for (i = 0; i < passive->devices.count; i++)
 572                 if (!acpi_processor_set_thermal_limit
 573                     (passive->devices.handles[i],
 574                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 575                         result = 0;
 576         if (result) {
 577                 passive->flags.enabled = 0;
 578                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 579                                   "Disabling passive cooling (zone is cool)\n"));
 580         }
 581 }
 582
 583 static void acpi_thermal_active(struct acpi_thermal *tz)
 584 {
 585         int result = 0;
 586         struct acpi_thermal_active *active = NULL;
 587         int i = 0;
 588         int j = 0;
 589         unsigned long maxtemp = 0;
 590
 591
 592         if (!tz)
 593                 return;
 594
 595         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 596                 active = &(tz->trips.active[i]);
 597                 if (!active || !active->flags.valid)
 598                         break;
 599                 if (tz->temperature >= active->temperature) {
 600                         /*
 601                          * Above Threshold?
 602                          * ----------------
 603                          * If not already enabled, turn ON all cooling devices
 604                          * associated with this active threshold.
 605                          */
 606                         if (active->temperature > maxtemp)
 607                                 tz->state.active_index = i;
 608                         maxtemp = active->temperature;
 609                         if (active->flags.enabled)
 610                                 continue;
 611                         for (j = 0; j < active->devices.count; j++) {
 612                                 result =
 613                                     acpi_bus_set_power(active->devices.
 614                                                        handles[j],
 615                                                        ACPI_STATE_D0);
 616                                 if (result) {
 617                                         printk(KERN_WARNING PREFIX
 618                                                       "Unable to turn cooling device [%p] 'on'\n",
 619                                                       active->devices.
 620                                                       handles[j]);
 621                                         continue;
 622                                 }
 623                                 active->flags.enabled = 1;
 624                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 625                                                   "Cooling device [%p] now 'on'\n",
 626                                                   active->devices.handles[j]));
 627                         }
 628                         continue;
 629                 }
 630                 if (!active->flags.enabled)
 631                         continue;
 632                 /*
 633                  * Below Threshold?
 634                  * ----------------
 635                  * Turn OFF all cooling devices associated with this
 636                  * threshold.
 637                  */
 638                 for (j = 0; j < active->devices.count; j++) {
 639                         result = acpi_bus_set_power(active->devices.handles[j],
 640                                                     ACPI_STATE_D3);
 641                         if (result) {
 642                                 printk(KERN_WARNING PREFIX
 643                                               "Unable to turn cooling device [%p] 'off'\n",
 644                                               active->devices.handles[j]);
 645                                 continue;
 646                         }
 647                         active->flags.enabled = 0;
 648                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 649                                           "Cooling device [%p] now 'off'\n",
 650                                           active->devices.handles[j]));
 651                 }
 652         }
 653 }
 654
 655 static void acpi_thermal_check(void *context);
 656
 657 static void acpi_thermal_run(unsigned long data)
 658 {
 659         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 660         if (!tz->zombie)
 661                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 662 }
 663
 664 static void acpi_thermal_check(void *data)
 665 {
 666         int result = 0;
 667         struct acpi_thermal *tz = data;
 668         unsigned long sleep_time = 0;
 669         int i = 0;
 670         struct acpi_thermal_state state;
 671
 672
 673         if (!tz) {
 674                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 675                 return;
 676         }
 677
 678         state = tz->state;
 679
 680         result = acpi_thermal_get_temperature(tz);
 681         if (result)
 682                 return;
 683
 684         memset(&tz->state, 0, sizeof(tz->state));
 685
 686         /*
 687          * Check Trip Points
 688          * -----------------
 689          * Compare the current temperature to the trip point values to see
 690          * if we've entered one of the thermal policy states.  Note that
 691          * this function determines when a state is entered, but the
 692          * individual policy decides when it is exited (e.g. hysteresis).
 693          */
 694         if (tz->trips.critical.flags.valid)
 695                 state.critical |=
 696                     (tz->temperature >= tz->trips.critical.temperature);
 697         if (tz->trips.hot.flags.valid)
 698                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 699         if (tz->trips.passive.flags.valid)
 700                 state.passive |=
 701                     (tz->temperature >= tz->trips.passive.temperature);
 702         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 703                 if (tz->trips.active[i].flags.valid)
 704                         state.active |=
 705                             (tz->temperature >=
 706                              tz->trips.active[i].temperature);
 707
 708         /*
 709          * Invoke Policy
 710          * -------------
 711          * Separated from the above check to allow individual policy to
 712          * determine when to exit a given state.
 713          */
 714         if (state.critical)
 715                 acpi_thermal_critical(tz);
 716         if (state.hot)
 717                 acpi_thermal_hot(tz);
 718         if (state.passive)
 719                 acpi_thermal_passive(tz);
 720         if (state.active)
 721                 acpi_thermal_active(tz);
 722
 723         /*
 724          * Calculate State
 725          * ---------------
 726          * Again, separated from the above two to allow independent policy
 727          * decisions.
 728          */
 729         tz->state.critical = tz->trips.critical.flags.enabled;
 730         tz->state.hot = tz->trips.hot.flags.enabled;
 731         tz->state.passive = tz->trips.passive.flags.enabled;
 732         tz->state.active = 0;
 733         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 734                 tz->state.active |= tz->trips.active[i].flags.enabled;
 735
 736         /*
 737          * Calculate Sleep Time
 738          * --------------------
 739          * If we're in the passive state, use _TSP's value.  Otherwise
 740          * use the default polling frequency (e.g. _TZP).  If no polling
 741          * frequency is specified then we'll wait forever (at least until
 742          * a thermal event occurs).  Note that _TSP and _TZD values are
 743          * given in 1/10th seconds (we must covert to milliseconds).
 744          */
 745         if (tz->state.passive)
 746                 sleep_time = tz->trips.passive.tsp * 100;
 747         else if (tz->polling_frequency > 0)
 748                 sleep_time = tz->polling_frequency * 100;
 749
 750         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 751                           tz->name, tz->temperature, sleep_time));
 752
 753         /*
 754          * Schedule Next Poll
 755          * ------------------
 756          */
 757         if (!sleep_time) {
 758                 if (timer_pending(&(tz->timer)))
 759                         del_timer(&(tz->timer));
 760         } else {
 761                 if (timer_pending(&(tz->timer)))
 762                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 763                 else {
 764                         tz->timer.data = (unsigned long)tz;
 765                         tz->timer.function = acpi_thermal_run;
 766                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 767                         add_timer(&(tz->timer));
 768                 }
 769         }
 770
 771         return;
 772 }
 773
 774 /* --------------------------------------------------------------------------
 775                               FS Interface (/proc)
 776    -------------------------------------------------------------------------- */
 777
 778 static struct proc_dir_entry *acpi_thermal_dir;
 779
 780 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 781 {
 782         struct acpi_thermal *tz = seq->private;
 783
 784
 785         if (!tz)
 786                 goto end;
 787
 788         seq_puts(seq, "state:                   ");
 789
 790         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 791             && !tz->state.active)
 792                 seq_puts(seq, "ok\n");
 793         else {
 794                 if (tz->state.critical)
 795                         seq_puts(seq, "critical ");
 796                 if (tz->state.hot)
 797                         seq_puts(seq, "hot ");
 798                 if (tz->state.passive)
 799                         seq_puts(seq, "passive ");
 800                 if (tz->state.active)
 801                         seq_printf(seq, "active[%d]", tz->state.active_index);
 802                 seq_puts(seq, "\n");
 803         }
 804
 805       end:
 806         return 0;
 807 }
 808
 809 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 810 {
 811         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 812 }
 813
 814 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 815 {
 816         int result = 0;
 817         struct acpi_thermal *tz = seq->private;
 818
 819
 820         if (!tz)
 821                 goto end;
 822
 823         result = acpi_thermal_get_temperature(tz);
 824         if (result)
 825                 goto end;
 826
 827         seq_printf(seq, "temperature:             %ld C\n",
 828                    KELVIN_TO_CELSIUS(tz->temperature));
 829
 830       end:
 831         return 0;
 832 }
 833
 834 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 835 {
 836         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 837 }
 838
 839 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 840 {
 841         struct acpi_thermal *tz = seq->private;
 842         int i = 0;
 843         int j = 0;
 844
 845
 846         if (!tz)
 847                 goto end;
 848
 849         if (tz->trips.critical.flags.valid)
 850                 seq_printf(seq, "critical (S5):           %ld C\n",
 851                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 852
 853         if (tz->trips.hot.flags.valid)
 854                 seq_printf(seq, "hot (S4):                %ld C\n",
 855                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 856
 857         if (tz->trips.passive.flags.valid) {
 858                 seq_printf(seq,
 859                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 860                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 861                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 862                            tz->trips.passive.tsp);
 863                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 864
 865                         seq_printf(seq, "0x%p ",
 866                                    tz->trips.passive.devices.handles[j]);
 867                 }
 868                 seq_puts(seq, "\n");
 869         }
 870
 871         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 872                 if (!(tz->trips.active[i].flags.valid))
 873                         break;
 874                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 875                            i,
 876                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 877                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 878                         seq_printf(seq, "0x%p ",
 879                                    tz->trips.active[i].devices.handles[j]);
 880                 seq_puts(seq, "\n");
 881         }
 882
 883       end:
 884         return 0;
 885 }
 886
 887 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 888 {
 889         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 890 }
 891
 892 static ssize_t
 893 acpi_thermal_write_trip_points(struct file *file,
 894                                const char __user * buffer,
 895                                size_t count, loff_t * ppos)
 896 {
 897         struct seq_file *m = file->private_data;
 898         struct acpi_thermal *tz = m->private;
 899
 900         char *limit_string;
 901         int num, critical, hot, passive;
 902         int *active;
 903         int i = 0;
 904
 905
 906         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 907         if (!limit_string)
 908                 return -ENOMEM;
 909
 910         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 911         if (!active) {
 912                 kfree(limit_string);
 913                 return -ENOMEM;
 914         }
 915
 916         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 917                 count = -EINVAL;
 918                 goto end;
 919         }
 920
 921         if (copy_from_user(limit_string, buffer, count)) {
 922                 count = -EFAULT;
 923                 goto end;
 924         }
 925
 926         limit_string[count] = '\0';
 927
 928         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 929                      &critical, &hot, &passive,
 930                      &active[0], &active[1], &active[2], &active[3], &active[4],
 931                      &active[5], &active[6], &active[7], &active[8],
 932                      &active[9]);
 933         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 934                 count = -EINVAL;
 935                 goto end;
 936         }
 937
 938         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 939         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 940         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 941         for (i = 0; i < num - 3; i++) {
 942                 if (!(tz->trips.active[i].flags.valid))
 943                         break;
 944                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 945         }
 946
 947       end:
 948         kfree(active);
 949         kfree(limit_string);
 950         return count;
 951 }
 952
 953 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 954 {
 955         struct acpi_thermal *tz = seq->private;
 956
 957
 958         if (!tz)
 959                 goto end;
 960
 961         if (!tz->flags.cooling_mode) {
 962                 seq_puts(seq, "<setting not supported>\n");
 963         }
 964
 965         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 966                 seq_printf(seq, "cooling mode:  critical\n");
 967         else
 968                 seq_printf(seq, "cooling mode:  %s\n",
 969                            tz->cooling_mode ? "passive" : "active");
 970
 971       end:
 972         return 0;
 973 }
 974
 975 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 976 {
 977         return single_open(file, acpi_thermal_cooling_seq_show,
 978                            PDE(inode)->data);
 979 }
 980
 981 static ssize_t
 982 acpi_thermal_write_cooling_mode(struct file *file,
 983                                 const char __user * buffer,
 984                                 size_t count, loff_t * ppos)
 985 {
 986         struct seq_file *m = file->private_data;
 987         struct acpi_thermal *tz = m->private;
 988         int result = 0;
 989         char mode_string[12] = { '\0' };
 990
 991
 992         if (!tz || (count > sizeof(mode_string) - 1))
 993                 return -EINVAL;
 994
 995         if (!tz->flags.cooling_mode)
 996                 return -ENODEV;
 997
 998         if (copy_from_user(mode_string, buffer, count))
 999                 return -EFAULT;
1000
1001         mode_string[count] = '\0';
1002
1003         result = acpi_thermal_set_cooling_mode(tz,
1004                                                simple_strtoul(mode_string, NULL,
1005                                                               0));
1006         if (result)
1007                 return result;
1008
1009         acpi_thermal_check(tz);
1010
1011         return count;
1012 }
1013
1014 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1015 {
1016         struct acpi_thermal *tz = seq->private;
1017
1018
1019         if (!tz)
1020                 goto end;
1021
1022         if (!tz->polling_frequency) {
1023                 seq_puts(seq, "<polling disabled>\n");
1024                 goto end;
1025         }
1026
1027         seq_printf(seq, "polling frequency:       %lu seconds\n",
1028                    (tz->polling_frequency / 10));
1029
1030       end:
1031         return 0;
1032 }
1033
1034 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1035 {
1036         return single_open(file, acpi_thermal_polling_seq_show,
1037                            PDE(inode)->data);
1038 }
1039
1040 static ssize_t
1041 acpi_thermal_write_polling(struct file *file,
1042                            const char __user * buffer,
1043                            size_t count, loff_t * ppos)
1044 {
1045         struct seq_file *m = file->private_data;
1046         struct acpi_thermal *tz = m->private;
1047         int result = 0;
1048         char polling_string[12] = { '\0' };
1049         int seconds = 0;
1050
1051
1052         if (!tz || (count > sizeof(polling_string) - 1))
1053                 return -EINVAL;
1054
1055         if (copy_from_user(polling_string, buffer, count))
1056                 return -EFAULT;
1057
1058         polling_string[count] = '\0';
1059
1060         seconds = simple_strtoul(polling_string, NULL, 0);
1061
1062         result = acpi_thermal_set_polling(tz, seconds);
1063         if (result)
1064                 return result;
1065
1066         acpi_thermal_check(tz);
1067
1068         return count;
1069 }
1070
1071 static int acpi_thermal_add_fs(struct acpi_device *device)
1072 {
1073         struct proc_dir_entry *entry = NULL;
1074
1075
1076         if (!acpi_device_dir(device)) {
1077                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1078                                                      acpi_thermal_dir);
1079                 if (!acpi_device_dir(device))
1080                         return -ENODEV;
1081                 acpi_device_dir(device)->owner = THIS_MODULE;
1082         }
1083
1084         /* 'state' [R] */
1085         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1086                                   S_IRUGO, acpi_device_dir(device));
1087         if (!entry)
1088                 return -ENODEV;
1089         else {
1090                 entry->proc_fops = &acpi_thermal_state_fops;
1091                 entry->data = acpi_driver_data(device);
1092                 entry->owner = THIS_MODULE;
1093         }
1094
1095         /* 'temperature' [R] */
1096         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1097                                   S_IRUGO, acpi_device_dir(device));
1098         if (!entry)
1099                 return -ENODEV;
1100         else {
1101                 entry->proc_fops = &acpi_thermal_temp_fops;
1102                 entry->data = acpi_driver_data(device);
1103                 entry->owner = THIS_MODULE;
1104         }
1105
1106         /* 'trip_points' [R/W] */
1107         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1108                                   S_IFREG | S_IRUGO | S_IWUSR,
1109                                   acpi_device_dir(device));
1110         if (!entry)
1111                 return -ENODEV;
1112         else {
1113                 entry->proc_fops = &acpi_thermal_trip_fops;
1114                 entry->data = acpi_driver_data(device);
1115                 entry->owner = THIS_MODULE;
1116         }
1117
1118         /* 'cooling_mode' [R/W] */
1119         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1120                                   S_IFREG | S_IRUGO | S_IWUSR,
1121                                   acpi_device_dir(device));
1122         if (!entry)
1123                 return -ENODEV;
1124         else {
1125                 entry->proc_fops = &acpi_thermal_cooling_fops;
1126                 entry->data = acpi_driver_data(device);
1127                 entry->owner = THIS_MODULE;
1128         }
1129
1130         /* 'polling_frequency' [R/W] */
1131         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1132                                   S_IFREG | S_IRUGO | S_IWUSR,
1133                                   acpi_device_dir(device));
1134         if (!entry)
1135                 return -ENODEV;
1136         else {
1137                 entry->proc_fops = &acpi_thermal_polling_fops;
1138                 entry->data = acpi_driver_data(device);
1139                 entry->owner = THIS_MODULE;
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int acpi_thermal_remove_fs(struct acpi_device *device)
1146 {
1147
1148         if (acpi_device_dir(device)) {
1149                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1154                                   acpi_device_dir(device));
1155                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1156                                   acpi_device_dir(device));
1157                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1158                                   acpi_device_dir(device));
1159                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1160                 acpi_device_dir(device) = NULL;
1161         }
1162
1163         return 0;
1164 }
1165
1166 /* --------------------------------------------------------------------------
1167                                  Driver Interface
1168    -------------------------------------------------------------------------- */
1169
1170 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1171 {
1172         struct acpi_thermal *tz = data;
1173         struct acpi_device *device = NULL;
1174
1175
1176         if (!tz)
1177                 return;
1178
1179         device = tz->device;
1180
1181         switch (event) {
1182         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1183                 acpi_thermal_check(tz);
1184                 break;
1185         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1186                 acpi_thermal_get_trip_points(tz);
1187                 acpi_thermal_check(tz);
1188                 acpi_bus_generate_event(device, event, 0);
1189                 break;
1190         case ACPI_THERMAL_NOTIFY_DEVICES:
1191                 if (tz->flags.devices)
1192                         acpi_thermal_get_devices(tz);
1193                 acpi_bus_generate_event(device, event, 0);
1194                 break;
1195         default:
1196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1197                                   "Unsupported event [0x%x]\n", event));
1198                 break;
1199         }
1200
1201         return;
1202 }
1203
1204 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1205 {
1206         int result = 0;
1207
1208
1209         if (!tz)
1210                 return -EINVAL;
1211
1212         /* Get temperature [_TMP] (required) */
1213         result = acpi_thermal_get_temperature(tz);
1214         if (result)
1215                 return result;
1216
1217         /* Get trip points [_CRT, _PSV, etc.] (required) */
1218         result = acpi_thermal_get_trip_points(tz);
1219         if (result)
1220                 return result;
1221
1222         /* Set the cooling mode [_SCP] to active cooling (default) */
1223         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1224         if (!result)
1225                 tz->flags.cooling_mode = 1;
1226         else {
1227                 /* Oh,we have not _SCP method.
1228                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1229                 tz->flags.cooling_mode = 0;
1230                 if (tz->trips.active[0].flags.valid
1231                     && tz->trips.passive.flags.valid) {
1232                         if (tz->trips.passive.temperature >
1233                             tz->trips.active[0].temperature)
1234                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1235                         else
1236                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1237                 } else if (!tz->trips.active[0].flags.valid
1238                            && tz->trips.passive.flags.valid) {
1239                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1240                 } else if (tz->trips.active[0].flags.valid
1241                            && !tz->trips.passive.flags.valid) {
1242                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1243                 } else {
1244                         /* _ACx and _PSV are optional, but _CRT is required */
1245                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1246                 }
1247         }
1248
1249         /* Get default polling frequency [_TZP] (optional) */
1250         if (tzp)
1251                 tz->polling_frequency = tzp;
1252         else
1253                 acpi_thermal_get_polling_frequency(tz);
1254
1255         /* Get devices in this thermal zone [_TZD] (optional) */
1256         result = acpi_thermal_get_devices(tz);
1257         if (!result)
1258                 tz->flags.devices = 1;
1259
1260         return 0;
1261 }
1262
1263 static int acpi_thermal_add(struct acpi_device *device)
1264 {
1265         int result = 0;
1266         acpi_status status = AE_OK;
1267         struct acpi_thermal *tz = NULL;
1268
1269
1270         if (!device)
1271                 return -EINVAL;
1272
1273         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1274         if (!tz)
1275                 return -ENOMEM;
1276
1277         tz->device = device;
1278         strcpy(tz->name, device->pnp.bus_id);
1279         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1280         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1281         acpi_driver_data(device) = tz;
1282
1283         result = acpi_thermal_get_info(tz);
1284         if (result)
1285                 goto end;
1286
1287         result = acpi_thermal_add_fs(device);
1288         if (result)
1289                 goto end;
1290
1291         init_timer(&tz->timer);
1292
1293         acpi_thermal_check(tz);
1294
1295         status = acpi_install_notify_handler(device->handle,
1296                                              ACPI_DEVICE_NOTIFY,
1297                                              acpi_thermal_notify, tz);
1298         if (ACPI_FAILURE(status)) {
1299                 result = -ENODEV;
1300                 goto end;
1301         }
1302
1303         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1304                acpi_device_name(device), acpi_device_bid(device),
1305                KELVIN_TO_CELSIUS(tz->temperature));
1306
1307       end:
1308         if (result) {
1309                 acpi_thermal_remove_fs(device);
1310                 kfree(tz);
1311         }
1312
1313         return result;
1314 }
1315
1316 static int acpi_thermal_remove(struct acpi_device *device, int type)
1317 {
1318         acpi_status status = AE_OK;
1319         struct acpi_thermal *tz = NULL;
1320
1321
1322         if (!device || !acpi_driver_data(device))
1323                 return -EINVAL;
1324
1325         tz = acpi_driver_data(device);
1326
1327         /* avoid timer adding new defer task */
1328         tz->zombie = 1;
1329         /* wait for running timer (on other CPUs) finish */
1330         del_timer_sync(&(tz->timer));
1331         /* synchronize deferred task */
1332         acpi_os_wait_events_complete(NULL);
1333         /* deferred task may reinsert timer */
1334         del_timer_sync(&(tz->timer));
1335
1336         status = acpi_remove_notify_handler(device->handle,
1337                                             ACPI_DEVICE_NOTIFY,
1338                                             acpi_thermal_notify);
1339
1340         /* Terminate policy */
1341         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1342                 tz->trips.passive.flags.enabled = 0;
1343                 acpi_thermal_passive(tz);
1344         }
1345         if (tz->trips.active[0].flags.valid
1346             && tz->trips.active[0].flags.enabled) {
1347                 tz->trips.active[0].flags.enabled = 0;
1348                 acpi_thermal_active(tz);
1349         }
1350
1351         acpi_thermal_remove_fs(device);
1352
1353         kfree(tz);
1354         return 0;
1355 }
1356
1357 static int acpi_thermal_resume(struct acpi_device *device)
1358 {
1359         struct acpi_thermal *tz = NULL;
1360         int i;
1361
1362         if (!device || !acpi_driver_data(device))
1363                 return -EINVAL;
1364
1365         tz = acpi_driver_data(device);
1366
1367         acpi_thermal_get_temperature(tz);
1368
1369         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1370                 if (tz->trips.active[i].flags.valid) {
1371                         tz->temperature = tz->trips.active[i].temperature;
1372                         tz->trips.active[i].flags.enabled = 0;
1373
1374                         acpi_thermal_active(tz);
1375
1376                         tz->state.active |= tz->trips.active[i].flags.enabled;
1377                         tz->state.active_index = i;
1378                 }
1379         }
1380
1381         acpi_thermal_check(tz);
1382
1383         return AE_OK;
1384 }
1385
1386 static int __init acpi_thermal_init(void)
1387 {
1388         int result = 0;
1389
1390
1391         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1392         if (!acpi_thermal_dir)
1393                 return -ENODEV;
1394         acpi_thermal_dir->owner = THIS_MODULE;
1395
1396         result = acpi_bus_register_driver(&acpi_thermal_driver);
1397         if (result < 0) {
1398                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1399                 return -ENODEV;
1400         }
1401
1402         return 0;
1403 }
1404
1405 static void __exit acpi_thermal_exit(void)
1406 {
1407
1408         acpi_bus_unregister_driver(&acpi_thermal_driver);
1409
1410         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1411
1412         return;
1413 }
1414
1415 module_init(acpi_thermal_init);
1416 module_exit(acpi_thermal_exit);