drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 40 $)
   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/compatmac.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/sched.h>
  41 #include <linux/kmod.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44
  45
  46 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  47 ACPI_MODULE_NAME                ("acpi_thermal")
  48
  49 MODULE_AUTHOR("Paul Diefenbaugh");
  50 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  51 MODULE_LICENSE("GPL");
  52
  53 static int tzp;
  54 MODULE_PARM(tzp, "i");
  55 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  56
  57 #define PREFIX                  "ACPI: "
  58
  59
  60 #define ACPI_THERMAL_MAX_ACTIVE 10
  61
  62 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  63 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  64
  65 static int acpi_thermal_add (struct acpi_device *device);
  66 static int acpi_thermal_remove (struct acpi_device *device, int type);
  67
  68 static struct acpi_driver acpi_thermal_driver = {
  69         .name =         ACPI_THERMAL_DRIVER_NAME,
  70         .class =        ACPI_THERMAL_CLASS,
  71         .ids =          ACPI_THERMAL_HID,
  72         .ops =          {
  73                                 .add =          acpi_thermal_add,
  74                                 .remove =       acpi_thermal_remove,
  75                         },
  76 };
  77
  78 struct acpi_thermal_state {
  79         u8                      critical:1;
  80         u8                      hot:1;
  81         u8                      passive:1;
  82         u8                      active:1;
  83         u8                      reserved:4;
  84         int                     active_index;
  85 };
  86
  87 struct acpi_thermal_state_flags {
  88         u8                      valid:1;
  89         u8                      enabled:1;
  90         u8                      reserved:6;
  91 };
  92
  93 struct acpi_thermal_critical {
  94         struct acpi_thermal_state_flags flags;
  95         unsigned long           temperature;
  96 };
  97
  98 struct acpi_thermal_hot {
  99         struct acpi_thermal_state_flags flags;
 100         unsigned long           temperature;
 101 };
 102
 103 struct acpi_thermal_passive {
 104         struct acpi_thermal_state_flags flags;
 105         unsigned long           temperature;
 106         unsigned long           tc1;
 107         unsigned long           tc2;
 108         unsigned long           tsp;
 109         struct acpi_handle_list devices;
 110 };
 111
 112 struct acpi_thermal_active {
 113         struct acpi_thermal_state_flags flags;
 114         unsigned long           temperature;
 115         struct acpi_handle_list devices;
 116 };
 117
 118 struct acpi_thermal_trips {
 119         struct acpi_thermal_critical critical;
 120         struct acpi_thermal_hot hot;
 121         struct acpi_thermal_passive passive;
 122         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 123 };
 124
 125 struct acpi_thermal_flags {
 126         u8                      cooling_mode:1;         /* _SCP */
 127         u8                      devices:1;              /* _TZD */
 128         u8                      reserved:6;
 129 };
 130
 131 struct acpi_thermal {
 132         acpi_handle             handle;
 133         acpi_bus_id             name;
 134         unsigned long           temperature;
 135         unsigned long           last_temperature;
 136         unsigned long           polling_frequency;
 137         u8                      cooling_mode;
 138         struct acpi_thermal_flags flags;
 139         struct acpi_thermal_state state;
 140         struct acpi_thermal_trips trips;
 141         struct acpi_handle_list devices;
 142         struct timer_list       timer;
 143 };
 144
 145
 146 /* --------------------------------------------------------------------------
 147                              Thermal Zone Management
 148    -------------------------------------------------------------------------- */
 149
 150 static int
 151 acpi_thermal_get_temperature (
 152         struct acpi_thermal *tz)
 153 {
 154         acpi_status             status = AE_OK;
 155
 156         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 157
 158         if (!tz)
 159                 return_VALUE(-EINVAL);
 160
 161         tz->last_temperature = tz->temperature;
 162
 163         status = acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 164         if (ACPI_FAILURE(status))
 165                 return -ENODEV;
 166
 167         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", tz->temperature));
 168
 169         return_VALUE(0);
 170 }
 171
 172
 173 static int
 174 acpi_thermal_get_polling_frequency (
 175         struct acpi_thermal     *tz)
 176 {
 177         acpi_status             status = AE_OK;
 178
 179         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 180
 181         if (!tz)
 182                 return_VALUE(-EINVAL);
 183
 184         status = acpi_evaluate_integer(tz->handle, "_TZP", NULL, &tz->polling_frequency);
 185         if (ACPI_FAILURE(status))
 186                 return_VALUE(-ENODEV);
 187
 188         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", tz->polling_frequency));
 189
 190         return_VALUE(0);
 191 }
 192
 193
 194 static int
 195 acpi_thermal_set_polling (
 196         struct acpi_thermal     *tz,
 197         int                     seconds)
 198 {
 199         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 200
 201         if (!tz)
 202                 return_VALUE(-EINVAL);
 203
 204         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 205
 206         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency set to %lu seconds\n", tz->polling_frequency));
 207
 208         return_VALUE(0);
 209 }
 210
 211
 212 static int
 213 acpi_thermal_set_cooling_mode (
 214         struct acpi_thermal     *tz,
 215         int                     mode)
 216 {
 217         acpi_status             status = AE_OK;
 218         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 219         struct acpi_object_list arg_list = {1, &arg0};
 220         acpi_handle             handle = NULL;
 221
 222         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 223
 224         if (!tz)
 225                 return_VALUE(-EINVAL);
 226
 227         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 228         if (ACPI_FAILURE(status)) {
 229                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 230                 status = acpi_get_handle(tz->handle, "_PSV", &handle);
 231                 if(!ACPI_FAILURE(status)) {
 232                         tz->cooling_mode = 1;
 233                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 234                                 mode?"passive":"active"));
 235                         return_VALUE(0);
 236                 }
 237                 return_VALUE(-ENODEV);
 238         }
 239
 240         arg0.integer.value = mode;
 241
 242         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 243         if (ACPI_FAILURE(status))
 244                 return_VALUE(-ENODEV);
 245
 246         tz->cooling_mode = mode;
 247
 248         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 249                 mode?"passive":"active"));
 250
 251         return_VALUE(0);
 252 }
 253
 254
 255 static int
 256 acpi_thermal_get_trip_points (
 257         struct acpi_thermal *tz)
 258 {
 259         acpi_status             status = AE_OK;
 260         int                     i = 0;
 261
 262         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 263
 264         if (!tz)
 265                 return_VALUE(-EINVAL);
 266
 267         /* Critical Shutdown (required) */
 268
 269         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 270                 &tz->trips.critical.temperature);
 271         if (ACPI_FAILURE(status)) {
 272                 tz->trips.critical.flags.valid = 0;
 273                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 274                 return -ENODEV;
 275         }
 276         else {
 277                 tz->trips.critical.flags.valid = 1;
 278                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found critical threshold [%lu]\n", tz->trips.critical.temperature));
 279         }
 280
 281         /* Critical Sleep (optional) */
 282
 283         status = acpi_evaluate_integer(tz->handle, "_HOT", NULL, &tz->trips.hot.temperature);
 284         if (ACPI_FAILURE(status)) {
 285                 tz->trips.hot.flags.valid = 0;
 286                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 287         }
 288         else {
 289                 tz->trips.hot.flags.valid = 1;
 290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", tz->trips.hot.temperature));
 291         }
 292
 293         /* Passive: Processors (optional) */
 294
 295         status = acpi_evaluate_integer(tz->handle, "_PSV", NULL, &tz->trips.passive.temperature);
 296         if (ACPI_FAILURE(status)) {
 297                 tz->trips.passive.flags.valid = 0;
 298                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 299         }
 300         else {
 301                 tz->trips.passive.flags.valid = 1;
 302
 303                 status = acpi_evaluate_integer(tz->handle, "_TC1", NULL, &tz->trips.passive.tc1);
 304                 if (ACPI_FAILURE(status))
 305                         tz->trips.passive.flags.valid = 0;
 306
 307                 status = acpi_evaluate_integer(tz->handle, "_TC2", NULL, &tz->trips.passive.tc2);
 308                 if (ACPI_FAILURE(status))
 309                         tz->trips.passive.flags.valid = 0;
 310
 311                 status = acpi_evaluate_integer(tz->handle, "_TSP", NULL, &tz->trips.passive.tsp);
 312                 if (ACPI_FAILURE(status))
 313                         tz->trips.passive.flags.valid = 0;
 314
 315                 status = acpi_evaluate_reference(tz->handle, "_PSL", NULL, &tz->trips.passive.devices);
 316                 if (ACPI_FAILURE(status))
 317                         tz->trips.passive.flags.valid = 0;
 318
 319                 if (!tz->trips.passive.flags.valid)
 320                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid passive threshold\n"));
 321                 else
 322                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found passive threshold [%lu]\n", tz->trips.passive.temperature));
 323         }
 324
 325         /* Active: Fans, etc. (optional) */
 326
 327         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 328
 329                 char name[5] = {'_','A','C',('0'+i),'\0'};
 330
 331                 status = acpi_evaluate_integer(tz->handle, name, NULL, &tz->trips.active[i].temperature);
 332                 if (ACPI_FAILURE(status))
 333                         break;
 334
 335                 name[2] = 'L';
 336                 status = acpi_evaluate_reference(tz->handle, name, NULL, &tz->trips.active[i].devices);
 337                 if (ACPI_SUCCESS(status)) {
 338                         tz->trips.active[i].flags.valid = 1;
 339                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found active threshold [%d]:[%lu]\n", i, tz->trips.active[i].temperature));
 340                 }
 341                 else
 342                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid active threshold [%d]\n", i));
 343         }
 344
 345         return_VALUE(0);
 346 }
 347
 348
 349 static int
 350 acpi_thermal_get_devices (
 351         struct acpi_thermal     *tz)
 352 {
 353         acpi_status             status = AE_OK;
 354
 355         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 356
 357         if (!tz)
 358                 return_VALUE(-EINVAL);
 359
 360         status = acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 361         if (ACPI_FAILURE(status))
 362                 return_VALUE(-ENODEV);
 363
 364         return_VALUE(0);
 365 }
 366
 367
 368 static int
 369 acpi_thermal_call_usermode (
 370         char                    *path)
 371 {
 372         char                    *argv[2] = {NULL, NULL};
 373         char                    *envp[3] = {NULL, NULL, NULL};
 374
 375         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 376
 377         if (!path)
 378                 return_VALUE(-EINVAL);
 379
 380         argv[0] = path;
 381
 382         /* minimal command environment */
 383         envp[0] = "HOME=/";
 384         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 385
 386         call_usermodehelper(argv[0], argv, envp);
 387
 388         return_VALUE(0);
 389 }
 390
 391
 392 static int
 393 acpi_thermal_critical (
 394         struct acpi_thermal     *tz)
 395 {
 396         int                     result = 0;
 397         struct acpi_device      *device = NULL;
 398
 399         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 400
 401         if (!tz || !tz->trips.critical.flags.valid)
 402                 return_VALUE(-EINVAL);
 403
 404         if (tz->temperature >= tz->trips.critical.temperature) {
 405                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 406                 tz->trips.critical.flags.enabled = 1;
 407         }
 408         else if (tz->trips.critical.flags.enabled)
 409                 tz->trips.critical.flags.enabled = 0;
 410
 411         result = acpi_bus_get_device(tz->handle, &device);
 412         if (result)
 413                 return_VALUE(result);
 414
 415         printk(KERN_EMERG "Critical temperature reached (%ld C), shutting down.\n", KELVIN_TO_CELSIUS(tz->temperature));
 416         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL, tz->trips.critical.flags.enabled);
 417
 418         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 419
 420         return_VALUE(0);
 421 }
 422
 423
 424 static int
 425 acpi_thermal_hot (
 426         struct acpi_thermal     *tz)
 427 {
 428         int                     result = 0;
 429         struct acpi_device      *device = NULL;
 430
 431         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 432
 433         if (!tz || !tz->trips.hot.flags.valid)
 434                 return_VALUE(-EINVAL);
 435
 436         if (tz->temperature >= tz->trips.hot.temperature) {
 437                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 438                 tz->trips.hot.flags.enabled = 1;
 439         }
 440         else if (tz->trips.hot.flags.enabled)
 441                 tz->trips.hot.flags.enabled = 0;
 442
 443         result = acpi_bus_get_device(tz->handle, &device);
 444         if (result)
 445                 return_VALUE(result);
 446
 447         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT, tz->trips.hot.flags.enabled);
 448
 449         /* TBD: Call user-mode "sleep(S4)" function */
 450
 451         return_VALUE(0);
 452 }
 453
 454
 455 static int
 456 acpi_thermal_passive (
 457         struct acpi_thermal     *tz)
 458 {
 459         int                     result = 0;
 460         struct acpi_thermal_passive *passive = NULL;
 461         int                     trend = 0;
 462         int                     i = 0;
 463
 464         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 465
 466         if (!tz || !tz->trips.passive.flags.valid)
 467                 return_VALUE(-EINVAL);
 468
 469         passive = &(tz->trips.passive);
 470
 471         /*
 472          * Above Trip?
 473          * -----------
 474          * Calculate the thermal trend (using the passive cooling equation)
 475          * and modify the performance limit for all passive cooling devices
 476          * accordingly.  Note that we assume symmetry.
 477          */
 478         if (tz->temperature >= passive->temperature) {
 479                 trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature));
 480                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 481                         "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 482                         trend, passive->tc1, tz->temperature,
 483                         tz->last_temperature, passive->tc2,
 484                         tz->temperature, passive->temperature));
 485                 tz->trips.passive.flags.enabled = 1;
 486                 /* Heating up? */
 487                 if (trend > 0)
 488                         for (i=0; i<passive->devices.count; i++)
 489                                 acpi_processor_set_thermal_limit(
 490                                         passive->devices.handles[i],
 491                                         ACPI_PROCESSOR_LIMIT_INCREMENT);
 492                 /* Cooling off? */
 493                 else if (trend < 0)
 494                         for (i=0; i<passive->devices.count; i++)
 495                                 acpi_processor_set_thermal_limit(
 496                                         passive->devices.handles[i],
 497                                         ACPI_PROCESSOR_LIMIT_DECREMENT);
 498         }
 499
 500         /*
 501          * Below Trip?
 502          * -----------
 503          * Implement passive cooling hysteresis to slowly increase performance
 504          * and avoid thrashing around the passive trip point.  Note that we
 505          * assume symmetry.
 506          */
 507         else if (tz->trips.passive.flags.enabled) {
 508                 for (i=0; i<passive->devices.count; i++)
 509                         result = acpi_processor_set_thermal_limit(
 510                                 passive->devices.handles[i],
 511                                 ACPI_PROCESSOR_LIMIT_DECREMENT);
 512                 if (result == 1) {
 513                         tz->trips.passive.flags.enabled = 0;
 514                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 515                                 "Disabling passive cooling (zone is cool)\n"));
 516                 }
 517         }
 518
 519         return_VALUE(0);
 520 }
 521
 522
 523 static int
 524 acpi_thermal_active (
 525         struct acpi_thermal     *tz)
 526 {
 527         int                     result = 0;
 528         struct acpi_thermal_active *active = NULL;
 529         int                     i = 0;
 530         int                     j = 0;
 531         unsigned long           maxtemp = 0;
 532
 533         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 534
 535         if (!tz)
 536                 return_VALUE(-EINVAL);
 537
 538         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 539
 540                 active = &(tz->trips.active[i]);
 541                 if (!active || !active->flags.valid)
 542                         break;
 543
 544                 /*
 545                  * Above Threshold?
 546                  * ----------------
 547                  * If not already enabled, turn ON all cooling devices
 548                  * associated with this active threshold.
 549                  */
 550                 if (tz->temperature >= active->temperature) {
 551                         if (active->temperature > maxtemp)
 552                                 tz->state.active_index = i, maxtemp = active->temperature;
 553                         if (!active->flags.enabled) {
 554                                 for (j = 0; j < active->devices.count; j++) {
 555                                         result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D0);
 556                                         if (result) {
 557                                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'on'\n", active->devices.handles[j]));
 558                                                 continue;
 559                                         }
 560                                         active->flags.enabled = 1;
 561                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'on'\n", active->devices.handles[j]));
 562                                 }
 563                         }
 564                 }
 565                 /*
 566                  * Below Threshold?
 567                  * ----------------
 568                  * Turn OFF all cooling devices associated with this
 569                  * threshold.
 570                  */
 571                 else if (active->flags.enabled) {
 572                         for (j = 0; j < active->devices.count; j++) {
 573                                 result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D3);
 574                                 if (result) {
 575                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'off'\n", active->devices.handles[j]));
 576                                         continue;
 577                                 }
 578                                 active->flags.enabled = 0;
 579                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'off'\n", active->devices.handles[j]));
 580                         }
 581                 }
 582         }
 583
 584         return_VALUE(0);
 585 }
 586
 587
 588 static void acpi_thermal_check (void *context);
 589
 590 static void
 591 acpi_thermal_run (
 592         unsigned long           data)
 593 {
 594         acpi_os_queue_for_execution(OSD_PRIORITY_GPE,  acpi_thermal_check, (void *) data);
 595 }
 596
 597
 598 static void
 599 acpi_thermal_check (
 600         void                    *data)
 601 {
 602         int                     result = 0;
 603         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 604         unsigned long           sleep_time = 0;
 605         int                     i = 0;
 606         struct acpi_thermal_state state = tz->state;
 607
 608         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 609
 610         if (!tz) {
 611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 612                 return_VOID;
 613         }
 614
 615         result = acpi_thermal_get_temperature(tz);
 616         if (result)
 617                 return_VOID;
 618
 619         memset(&tz->state, 0, sizeof(tz->state));
 620
 621         /*
 622          * Check Trip Points
 623          * -----------------
 624          * Compare the current temperature to the trip point values to see
 625          * if we've entered one of the thermal policy states.  Note that
 626          * this function determines when a state is entered, but the
 627          * individual policy decides when it is exited (e.g. hysteresis).
 628          */
 629         if (tz->trips.critical.flags.valid)
 630                 state.critical |= (tz->temperature >= tz->trips.critical.temperature);
 631         if (tz->trips.hot.flags.valid)
 632                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 633         if (tz->trips.passive.flags.valid)
 634                 state.passive |= (tz->temperature >= tz->trips.passive.temperature);
 635         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 636                 if (tz->trips.active[i].flags.valid)
 637                         state.active |= (tz->temperature >= tz->trips.active[i].temperature);
 638
 639         /*
 640          * Invoke Policy
 641          * -------------
 642          * Separated from the above check to allow individual policy to
 643          * determine when to exit a given state.
 644          */
 645         if (state.critical)
 646                 acpi_thermal_critical(tz);
 647         if (state.hot)
 648                 acpi_thermal_hot(tz);
 649         if (state.passive)
 650                 acpi_thermal_passive(tz);
 651         if (state.active)
 652                 acpi_thermal_active(tz);
 653
 654         /*
 655          * Calculate State
 656          * ---------------
 657          * Again, separated from the above two to allow independent policy
 658          * decisions.
 659          */
 660         if (tz->trips.critical.flags.enabled)
 661                 tz->state.critical = 1;
 662         if (tz->trips.hot.flags.enabled)
 663                 tz->state.hot = 1;
 664         if (tz->trips.passive.flags.enabled)
 665                 tz->state.passive = 1;
 666         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 667                 if (tz->trips.active[i].flags.enabled)
 668                         tz->state.active = 1;
 669
 670         /*
 671          * Calculate Sleep Time
 672          * --------------------
 673          * If we're in the passive state, use _TSP's value.  Otherwise
 674          * use the default polling frequency (e.g. _TZP).  If no polling
 675          * frequency is specified then we'll wait forever (at least until
 676          * a thermal event occurs).  Note that _TSP and _TZD values are
 677          * given in 1/10th seconds (we must covert to milliseconds).
 678          */
 679         if (tz->state.passive)
 680                 sleep_time = tz->trips.passive.tsp * 100;
 681         else if (tz->polling_frequency > 0)
 682                 sleep_time = tz->polling_frequency * 100;
 683
 684         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 685                 tz->name, tz->temperature, sleep_time));
 686
 687         /*
 688          * Schedule Next Poll
 689          * ------------------
 690          */
 691         if (!sleep_time) {
 692                 if (timer_pending(&(tz->timer)))
 693                         del_timer(&(tz->timer));
 694         }
 695         else {
 696                 if (timer_pending(&(tz->timer)))
 697                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 698                 else {
 699                         tz->timer.data = (unsigned long) tz;
 700                         tz->timer.function = acpi_thermal_run;
 701                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 702                         add_timer(&(tz->timer));
 703                 }
 704         }
 705
 706         return_VOID;
 707 }
 708
 709
 710 /* --------------------------------------------------------------------------
 711                               FS Interface (/proc)
 712    -------------------------------------------------------------------------- */
 713
 714 struct proc_dir_entry           *acpi_thermal_dir;
 715
 716
 717 static int
 718 acpi_thermal_read_state (
 719         char                    *page,
 720         char                    **start,
 721         off_t                   off,
 722         int                     count,
 723         int                     *eof,
 724         void                    *data)
 725 {
 726         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 727         char                    *p = page;
 728         int                     len = 0;
 729
 730         ACPI_FUNCTION_TRACE("acpi_thermal_read_state");
 731
 732         if (!tz || (off != 0))
 733                 goto end;
 734
 735         p += sprintf(p, "state:                   ");
 736
 737         if (!tz->state.critical && !tz->state.hot && !tz->state.passive && !tz->state.active)
 738                 p += sprintf(p, "ok\n");
 739         else {
 740                 if (tz->state.critical)
 741                         p += sprintf(p, "critical ");
 742                 if (tz->state.hot)
 743                         p += sprintf(p, "hot ");
 744                 if (tz->state.passive)
 745                         p += sprintf(p, "passive ");
 746                 if (tz->state.active)
 747                         p += sprintf(p, "active[%d]", tz->state.active_index);
 748                 p += sprintf(p, "\n");
 749         }
 750
 751 end:
 752         len = (p - page);
 753         if (len <= off+count) *eof = 1;
 754         *start = page + off;
 755         len -= off;
 756         if (len>count) len = count;
 757         if (len<0) len = 0;
 758
 759         return_VALUE(len);
 760 }
 761
 762
 763 static int
 764 acpi_thermal_read_temperature (
 765         char                    *page,
 766         char                    **start,
 767         off_t                   off,
 768         int                     count,
 769         int                     *eof,
 770         void                    *data)
 771 {
 772         int                     result = 0;
 773         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 774         char                    *p = page;
 775         int                     len = 0;
 776
 777         ACPI_FUNCTION_TRACE("acpi_thermal_read_temperature");
 778
 779         if (!tz || (off != 0))
 780                 goto end;
 781
 782         result = acpi_thermal_get_temperature(tz);
 783         if (result)
 784                 goto end;
 785
 786         p += sprintf(p, "temperature:             %ld C\n",
 787                 KELVIN_TO_CELSIUS(tz->temperature));
 788
 789 end:
 790         len = (p - page);
 791         if (len <= off+count) *eof = 1;
 792         *start = page + off;
 793         len -= off;
 794         if (len>count) len = count;
 795         if (len<0) len = 0;
 796
 797         return_VALUE(len);
 798 }
 799
 800
 801 static int
 802 acpi_thermal_read_trip_points (
 803         char                    *page,
 804         char                    **start,
 805         off_t                   off,
 806         int                     count,
 807         int                     *eof,
 808         void                    *data)
 809 {
 810         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 811         char                    *p = page;
 812         int                     len = 0;
 813         int                     i = 0;
 814         int                     j = 0;
 815
 816         ACPI_FUNCTION_TRACE("acpi_thermal_read_trip_points");
 817
 818         if (!tz || (off != 0))
 819                 goto end;
 820
 821         if (tz->trips.critical.flags.valid)
 822                 p += sprintf(p, "critical (S5):           %ld C\n",
 823                         KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 824
 825         if (tz->trips.hot.flags.valid)
 826                 p += sprintf(p, "hot (S4):                %ld C\n",
 827                         KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 828
 829         if (tz->trips.passive.flags.valid) {
 830                 p += sprintf(p, "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 831                         KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 832                         tz->trips.passive.tc1,
 833                         tz->trips.passive.tc2,
 834                         tz->trips.passive.tsp);
 835                 for (j=0; j<tz->trips.passive.devices.count; j++) {
 836
 837                         p += sprintf(p, "0x%p ", tz->trips.passive.devices.handles[j]);
 838                 }
 839                 p += sprintf(p, "\n");
 840         }
 841
 842         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 843                 if (!(tz->trips.active[i].flags.valid))
 844                         break;
 845                 p += sprintf(p, "active[%d]:               %ld C: devices=",
 846                         i, KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 847                 for (j=0; j<tz->trips.active[i].devices.count; j++)
 848                         p += sprintf(p, "0x%p ",
 849                                 tz->trips.active[i].devices.handles[j]);
 850                 p += sprintf(p, "\n");
 851         }
 852
 853 end:
 854         len = (p - page);
 855         if (len <= off+count) *eof = 1;
 856         *start = page + off;
 857         len -= off;
 858         if (len>count) len = count;
 859         if (len<0) len = 0;
 860
 861         return_VALUE(len);
 862 }
 863
 864
 865 static int
 866 acpi_thermal_write_trip_points (
 867         struct file             *file,
 868         const char              *buffer,
 869         unsigned long           count,
 870         void                    *data)
 871 {
 872         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 873         char                    limit_string[25] = {'\0'};
 874         int                     critical, hot, passive, active0, active1;
 875
 876         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 877
 878         if (!tz || (count > sizeof(limit_string) - 1)) {
 879                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 880                 return_VALUE(-EINVAL);
 881         }
 882
 883         if (copy_from_user(limit_string, buffer, count)) {
 884                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 885                 return_VALUE(-EFAULT);
 886         }
 887
 888         limit_string[count] = '\0';
 889
 890         if (sscanf(limit_string, "%d:%d:%d:%d:%d", &critical, &hot, &passive, &active0, &active1) != 5) {
 891                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 892                 return_VALUE(-EINVAL);
 893         }
 894
 895         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 896         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 897         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 898         tz->trips.active[0].temperature = CELSIUS_TO_KELVIN(active0);
 899         tz->trips.active[1].temperature = CELSIUS_TO_KELVIN(active1);
 900
 901         return_VALUE(count);
 902 }
 903
 904
 905 static int
 906 acpi_thermal_read_cooling_mode (
 907         char                    *page,
 908         char                    **start,
 909         off_t                   off,
 910         int                     count,
 911         int                     *eof,
 912         void                    *data)
 913 {
 914         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 915         char                    *p = page;
 916         int                     len = 0;
 917
 918         ACPI_FUNCTION_TRACE("acpi_thermal_read_cooling_mode");
 919
 920         if (!tz || (off != 0))
 921                 goto end;
 922
 923         if (!tz->flags.cooling_mode) {
 924                 p += sprintf(p, "<not supported>\n");
 925                 goto end;
 926         }
 927
 928         p += sprintf(p, "cooling mode:            %s\n",
 929                 tz->cooling_mode?"passive":"active");
 930
 931 end:
 932         len = (p - page);
 933         if (len <= off+count) *eof = 1;
 934         *start = page + off;
 935         len -= off;
 936         if (len>count) len = count;
 937         if (len<0) len = 0;
 938
 939         return_VALUE(len);
 940 }
 941
 942
 943 static int
 944 acpi_thermal_write_cooling_mode (
 945         struct file             *file,
 946         const char              *buffer,
 947         unsigned long           count,
 948         void                    *data)
 949 {
 950         int                     result = 0;
 951         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 952         char                    mode_string[12] = {'\0'};
 953
 954         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
 955
 956         if (!tz || (count > sizeof(mode_string) - 1))
 957                 return_VALUE(-EINVAL);
 958
 959         if (!tz->flags.cooling_mode)
 960                 return_VALUE(-ENODEV);
 961
 962         if (copy_from_user(mode_string, buffer, count))
 963                 return_VALUE(-EFAULT);
 964
 965         mode_string[count] = '\0';
 966
 967         result = acpi_thermal_set_cooling_mode(tz,
 968                 simple_strtoul(mode_string, NULL, 0));
 969         if (result)
 970                 return_VALUE(result);
 971
 972         return_VALUE(count);
 973 }
 974
 975
 976 static int
 977 acpi_thermal_read_polling (
 978         char                    *page,
 979         char                    **start,
 980         off_t                   off,
 981         int                     count,
 982         int                     *eof,
 983         void                    *data)
 984 {
 985         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 986         char                    *p = page;
 987         int                     len = 0;
 988
 989         ACPI_FUNCTION_TRACE("acpi_thermal_read_polling");
 990
 991         if (!tz || (off != 0))
 992                 goto end;
 993
 994         if (!tz->polling_frequency) {
 995                 p += sprintf(p, "<polling disabled>\n");
 996                 goto end;
 997         }
 998
 999         p += sprintf(p, "polling frequency:       %lu seconds\n",
1000                 (tz->polling_frequency / 10));
1001
1002 end:
1003         len = (p - page);
1004         if (len <= off+count) *eof = 1;
1005         *start = page + off;
1006         len -= off;
1007         if (len>count) len = count;
1008         if (len<0) len = 0;
1009
1010         return_VALUE(len);
1011 }
1012
1013
1014 static int
1015 acpi_thermal_write_polling (
1016         struct file             *file,
1017         const char              *buffer,
1018         unsigned long           count,
1019         void                    *data)
1020 {
1021         int                     result = 0;
1022         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
1023         char                    polling_string[12] = {'\0'};
1024         int                     seconds = 0;
1025
1026         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1027
1028         if (!tz || (count > sizeof(polling_string) - 1))
1029                 return_VALUE(-EINVAL);
1030
1031         if (copy_from_user(polling_string, buffer, count))
1032                 return_VALUE(-EFAULT);
1033
1034         polling_string[count] = '\0';
1035
1036         seconds = simple_strtoul(polling_string, NULL, 0);
1037
1038         result = acpi_thermal_set_polling(tz, seconds);
1039         if (result)
1040                 return_VALUE(result);
1041
1042         acpi_thermal_check(tz);
1043
1044         return_VALUE(count);
1045 }
1046
1047
1048 static int
1049 acpi_thermal_add_fs (
1050         struct acpi_device      *device)
1051 {
1052         struct proc_dir_entry   *entry = NULL;
1053
1054         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1055
1056         if (!acpi_device_dir(device)) {
1057                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1058                         acpi_thermal_dir);
1059                 if (!acpi_device_dir(device))
1060                         return_VALUE(-ENODEV);
1061                 acpi_device_dir(device)->owner = THIS_MODULE;
1062         }
1063
1064         /* 'state' [R] */
1065         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1066                 S_IRUGO, acpi_device_dir(device));
1067         if (!entry)
1068                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1069                         "Unable to create '%s' fs entry\n",
1070                         ACPI_THERMAL_FILE_STATE));
1071         else {
1072                 entry->read_proc = acpi_thermal_read_state;
1073                 entry->data = acpi_driver_data(device);
1074                 entry->owner = THIS_MODULE;
1075         }
1076
1077         /* 'temperature' [R] */
1078         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1079                 S_IRUGO, acpi_device_dir(device));
1080         if (!entry)
1081                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1082                         "Unable to create '%s' fs entry\n",
1083                         ACPI_THERMAL_FILE_TEMPERATURE));
1084         else {
1085                 entry->read_proc = acpi_thermal_read_temperature;
1086                 entry->data = acpi_driver_data(device);
1087                 entry->owner = THIS_MODULE;
1088         }
1089
1090         /* 'trip_points' [R/W] */
1091         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1092                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1093         if (!entry)
1094                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1095                         "Unable to create '%s' fs entry\n",
1096                         ACPI_THERMAL_FILE_POLLING_FREQ));
1097         else {
1098                 entry->read_proc = acpi_thermal_read_trip_points;
1099                 entry->write_proc = acpi_thermal_write_trip_points;
1100                 entry->data = acpi_driver_data(device);
1101                 entry->owner = THIS_MODULE;
1102         }
1103
1104         /* 'cooling_mode' [R/W] */
1105         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1106                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1107         if (!entry)
1108                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1109                         "Unable to create '%s' fs entry\n",
1110                         ACPI_THERMAL_FILE_COOLING_MODE));
1111         else {
1112                 entry->read_proc = acpi_thermal_read_cooling_mode;
1113                 entry->write_proc = acpi_thermal_write_cooling_mode;
1114                 entry->data = acpi_driver_data(device);
1115                 entry->owner = THIS_MODULE;
1116         }
1117
1118         /* 'polling_frequency' [R/W] */
1119         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1120                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1121         if (!entry)
1122                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1123                         "Unable to create '%s' fs entry\n",
1124                         ACPI_THERMAL_FILE_POLLING_FREQ));
1125         else {
1126                 entry->read_proc = acpi_thermal_read_polling;
1127                 entry->write_proc = acpi_thermal_write_polling;
1128                 entry->data = acpi_driver_data(device);
1129                 entry->owner = THIS_MODULE;
1130         }
1131
1132         return_VALUE(0);
1133 }
1134
1135
1136 static int
1137 acpi_thermal_remove_fs (
1138         struct acpi_device      *device)
1139 {
1140         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1141
1142         if (acpi_device_dir(device)) {
1143                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1144                                   acpi_device_dir(device));
1145                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1146                                   acpi_device_dir(device));
1147                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1148                                   acpi_device_dir(device));
1149                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1154                 acpi_device_dir(device) = NULL;
1155         }
1156
1157         return_VALUE(0);
1158 }
1159
1160
1161 /* --------------------------------------------------------------------------
1162                                  Driver Interface
1163    -------------------------------------------------------------------------- */
1164
1165 static void
1166 acpi_thermal_notify (
1167         acpi_handle             handle,
1168         u32                     event,
1169         void                    *data)
1170 {
1171         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
1172         struct acpi_device      *device = NULL;
1173
1174         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1175
1176         if (!tz)
1177                 return_VOID;
1178
1179         if (acpi_bus_get_device(tz->handle, &device))
1180                 return_VOID;
1181
1182         switch (event) {
1183         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1184                 acpi_thermal_check(tz);
1185                 break;
1186         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1187                 acpi_thermal_get_trip_points(tz);
1188                 acpi_thermal_check(tz);
1189                 acpi_bus_generate_event(device, event, 0);
1190                 break;
1191         case ACPI_THERMAL_NOTIFY_DEVICES:
1192                 if (tz->flags.devices)
1193                         acpi_thermal_get_devices(tz);
1194                 acpi_bus_generate_event(device, event, 0);
1195                 break;
1196         default:
1197                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1198                         "Unsupported event [0x%x]\n", event));
1199                 break;
1200         }
1201
1202         return_VOID;
1203 }
1204
1205
1206 static int
1207 acpi_thermal_get_info (
1208         struct acpi_thermal     *tz)
1209 {
1210         int                     result = 0;
1211
1212         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1213
1214         if (!tz)
1215                 return_VALUE(-EINVAL);
1216
1217         /* Get temperature [_TMP] (required) */
1218         result = acpi_thermal_get_temperature(tz);
1219         if (result)
1220                 return_VALUE(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
1227         /* Get trip points [_CRT, _PSV, etc.] (required) */
1228         result = acpi_thermal_get_trip_points(tz);
1229         if (result)
1230                 return_VALUE(result);
1231
1232         /* Get default polling frequency [_TZP] (optional) */
1233         if (tzp)
1234                 tz->polling_frequency = tzp;
1235         else
1236                 acpi_thermal_get_polling_frequency(tz);
1237
1238         /* Get devices in this thermal zone [_TZD] (optional) */
1239         result = acpi_thermal_get_devices(tz);
1240         if (!result)
1241                 tz->flags.devices = 1;
1242
1243         return_VALUE(0);
1244 }
1245
1246
1247 static int
1248 acpi_thermal_add (
1249         struct acpi_device              *device)
1250 {
1251         int                     result = 0;
1252         acpi_status             status = AE_OK;
1253         struct acpi_thermal     *tz = NULL;
1254
1255         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1256
1257         if (!device)
1258                 return_VALUE(-EINVAL);
1259
1260         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1261         if (!tz)
1262                 return_VALUE(-ENOMEM);
1263         memset(tz, 0, sizeof(struct acpi_thermal));
1264
1265         tz->handle = device->handle;
1266         sprintf(tz->name, "%s", device->pnp.bus_id);
1267         sprintf(acpi_device_name(device), "%s", ACPI_THERMAL_DEVICE_NAME);
1268         sprintf(acpi_device_class(device), "%s", ACPI_THERMAL_CLASS);
1269         acpi_driver_data(device) = tz;
1270
1271         result = acpi_thermal_get_info(tz);
1272         if (result)
1273                 goto end;
1274
1275         result = acpi_thermal_add_fs(device);
1276         if (result)
1277                 return_VALUE(result);
1278
1279         init_timer(&tz->timer);
1280
1281         acpi_thermal_check(tz);
1282
1283         status = acpi_install_notify_handler(tz->handle,
1284                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify, tz);
1285         if (ACPI_FAILURE(status)) {
1286                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1287                         "Error installing notify handler\n"));
1288                 result = -ENODEV;
1289                 goto end;
1290         }
1291
1292         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1293                 acpi_device_name(device), acpi_device_bid(device),
1294                 KELVIN_TO_CELSIUS(tz->temperature));
1295
1296 end:
1297         if (result) {
1298                 acpi_thermal_remove_fs(device);
1299                 kfree(tz);
1300         }
1301
1302         return_VALUE(result);
1303 }
1304
1305
1306 static int
1307 acpi_thermal_remove (
1308         struct acpi_device      *device,
1309         int                     type)
1310 {
1311         acpi_status             status = AE_OK;
1312         struct acpi_thermal     *tz = NULL;
1313
1314         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1315
1316         if (!device || !acpi_driver_data(device))
1317                 return_VALUE(-EINVAL);
1318
1319         tz = (struct acpi_thermal *) acpi_driver_data(device);
1320
1321         if (timer_pending(&(tz->timer)))
1322                 del_timer(&(tz->timer));
1323
1324         status = acpi_remove_notify_handler(tz->handle,
1325                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify);
1326         if (ACPI_FAILURE(status))
1327                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1328                         "Error removing notify handler\n"));
1329
1330         /* Terminate policy */
1331         if (tz->trips.passive.flags.valid
1332                 && tz->trips.passive.flags.enabled) {
1333                 tz->trips.passive.flags.enabled = 0;
1334                 acpi_thermal_passive(tz);
1335         }
1336         if (tz->trips.active[0].flags.valid
1337                 && tz->trips.active[0].flags.enabled) {
1338                 tz->trips.active[0].flags.enabled = 0;
1339                 acpi_thermal_active(tz);
1340         }
1341
1342         acpi_thermal_remove_fs(device);
1343
1344         return_VALUE(0);
1345 }
1346
1347
1348 static int __init
1349 acpi_thermal_init (void)
1350 {
1351         int                     result = 0;
1352
1353         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1354
1355         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1356         if (!acpi_thermal_dir)
1357                 return_VALUE(-ENODEV);
1358         acpi_thermal_dir->owner = THIS_MODULE;
1359
1360         result = acpi_bus_register_driver(&acpi_thermal_driver);
1361         if (result < 0) {
1362                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1363                 return_VALUE(-ENODEV);
1364         }
1365
1366         return_VALUE(0);
1367 }
1368
1369
1370 static void __exit
1371 acpi_thermal_exit (void)
1372 {
1373         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1374
1375         acpi_bus_unregister_driver(&acpi_thermal_driver);
1376
1377         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1378
1379         return_VOID;
1380 }
1381
1382
1383 module_init(acpi_thermal_init);
1384 module_exit(acpi_thermal_exit);