drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/sched.h>
  40 #include <linux/kmod.h>
  41 #include <linux/seq_file.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_THERMAL_COMPONENT          0x04000000
  48 #define ACPI_THERMAL_CLASS              "thermal_zone"
  49 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
  50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  51 #define ACPI_THERMAL_FILE_STATE         "state"
  52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  63 #define ACPI_THERMAL_MODE_CRITICAL      0xff
  64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  71
  72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  73 ACPI_MODULE_NAME                ("acpi_thermal")
  74
  75 MODULE_AUTHOR("Paul Diefenbaugh");
  76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  77 MODULE_LICENSE("GPL");
  78
  79 static int tzp;
  80 module_param(tzp, int, 0);
  81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  82
  83
  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_state_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  88 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  89 static ssize_t acpi_thermal_write_trip_points (struct file*,const char __user *,size_t,loff_t *);
  90 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  91 static ssize_t acpi_thermal_write_cooling_mode (struct file*,const char __user *,size_t,loff_t *);
  92 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  93 static ssize_t acpi_thermal_write_polling(struct file*,const char __user *,size_t,loff_t *);
  94
  95 static struct acpi_driver acpi_thermal_driver = {
  96         .name =         ACPI_THERMAL_DRIVER_NAME,
  97         .class =        ACPI_THERMAL_CLASS,
  98         .ids =          ACPI_THERMAL_HID,
  99         .ops =          {
 100                                 .add =          acpi_thermal_add,
 101                                 .remove =       acpi_thermal_remove,
 102                         },
 103 };
 104
 105 struct acpi_thermal_state {
 106         u8                      critical:1;
 107         u8                      hot:1;
 108         u8                      passive:1;
 109         u8                      active:1;
 110         u8                      reserved:4;
 111         int                     active_index;
 112 };
 113
 114 struct acpi_thermal_state_flags {
 115         u8                      valid:1;
 116         u8                      enabled:1;
 117         u8                      reserved:6;
 118 };
 119
 120 struct acpi_thermal_critical {
 121         struct acpi_thermal_state_flags flags;
 122         unsigned long           temperature;
 123 };
 124
 125 struct acpi_thermal_hot {
 126         struct acpi_thermal_state_flags flags;
 127         unsigned long           temperature;
 128 };
 129
 130 struct acpi_thermal_passive {
 131         struct acpi_thermal_state_flags flags;
 132         unsigned long           temperature;
 133         unsigned long           tc1;
 134         unsigned long           tc2;
 135         unsigned long           tsp;
 136         struct acpi_handle_list devices;
 137 };
 138
 139 struct acpi_thermal_active {
 140         struct acpi_thermal_state_flags flags;
 141         unsigned long           temperature;
 142         struct acpi_handle_list devices;
 143 };
 144
 145 struct acpi_thermal_trips {
 146         struct acpi_thermal_critical critical;
 147         struct acpi_thermal_hot hot;
 148         struct acpi_thermal_passive passive;
 149         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 150 };
 151
 152 struct acpi_thermal_flags {
 153         u8                      cooling_mode:1;         /* _SCP */
 154         u8                      devices:1;              /* _TZD */
 155         u8                      reserved:6;
 156 };
 157
 158 struct acpi_thermal {
 159         acpi_handle             handle;
 160         acpi_bus_id             name;
 161         unsigned long           temperature;
 162         unsigned long           last_temperature;
 163         unsigned long           polling_frequency;
 164         u8                      cooling_mode;
 165         volatile u8             zombie;
 166         struct acpi_thermal_flags flags;
 167         struct acpi_thermal_state state;
 168         struct acpi_thermal_trips trips;
 169         struct acpi_handle_list devices;
 170         struct timer_list       timer;
 171 };
 172
 173 static struct file_operations acpi_thermal_state_fops = {
 174         .open           = acpi_thermal_state_open_fs,
 175         .read           = seq_read,
 176         .llseek         = seq_lseek,
 177         .release        = single_release,
 178 };
 179
 180 static struct file_operations acpi_thermal_temp_fops = {
 181         .open           = acpi_thermal_temp_open_fs,
 182         .read           = seq_read,
 183         .llseek         = seq_lseek,
 184         .release        = single_release,
 185 };
 186
 187 static struct file_operations acpi_thermal_trip_fops = {
 188         .open           = acpi_thermal_trip_open_fs,
 189         .read           = seq_read,
 190         .write          = acpi_thermal_write_trip_points,
 191         .llseek         = seq_lseek,
 192         .release        = single_release,
 193 };
 194
 195 static struct file_operations acpi_thermal_cooling_fops = {
 196         .open           = acpi_thermal_cooling_open_fs,
 197         .read           = seq_read,
 198         .write          = acpi_thermal_write_cooling_mode,
 199         .llseek         = seq_lseek,
 200         .release        = single_release,
 201 };
 202
 203 static struct file_operations acpi_thermal_polling_fops = {
 204         .open           = acpi_thermal_polling_open_fs,
 205         .read           = seq_read,
 206         .write          = acpi_thermal_write_polling,
 207         .llseek         = seq_lseek,
 208         .release        = single_release,
 209 };
 210
 211 /* --------------------------------------------------------------------------
 212                              Thermal Zone Management
 213    -------------------------------------------------------------------------- */
 214
 215 static int
 216 acpi_thermal_get_temperature (
 217         struct acpi_thermal *tz)
 218 {
 219         acpi_status             status = AE_OK;
 220
 221         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 222
 223         if (!tz)
 224                 return_VALUE(-EINVAL);
 225
 226         tz->last_temperature = tz->temperature;
 227
 228         status = acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 229         if (ACPI_FAILURE(status))
 230                 return_VALUE(-ENODEV);
 231
 232         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", tz->temperature));
 233
 234         return_VALUE(0);
 235 }
 236
 237
 238 static int
 239 acpi_thermal_get_polling_frequency (
 240         struct acpi_thermal     *tz)
 241 {
 242         acpi_status             status = AE_OK;
 243
 244         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 245
 246         if (!tz)
 247                 return_VALUE(-EINVAL);
 248
 249         status = acpi_evaluate_integer(tz->handle, "_TZP", NULL, &tz->polling_frequency);
 250         if (ACPI_FAILURE(status))
 251                 return_VALUE(-ENODEV);
 252
 253         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", tz->polling_frequency));
 254
 255         return_VALUE(0);
 256 }
 257
 258
 259 static int
 260 acpi_thermal_set_polling (
 261         struct acpi_thermal     *tz,
 262         int                     seconds)
 263 {
 264         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 265
 266         if (!tz)
 267                 return_VALUE(-EINVAL);
 268
 269         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency set to %lu seconds\n", tz->polling_frequency));
 272
 273         return_VALUE(0);
 274 }
 275
 276
 277 static int
 278 acpi_thermal_set_cooling_mode (
 279         struct acpi_thermal     *tz,
 280         int                     mode)
 281 {
 282         acpi_status             status = AE_OK;
 283         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 284         struct acpi_object_list arg_list = {1, &arg0};
 285         acpi_handle             handle = NULL;
 286
 287         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 288
 289         if (!tz)
 290                 return_VALUE(-EINVAL);
 291
 292         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 293         if (ACPI_FAILURE(status)) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 295                 return_VALUE(-ENODEV);
 296         }
 297
 298         arg0.integer.value = mode;
 299
 300         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 301         if (ACPI_FAILURE(status))
 302                 return_VALUE(-ENODEV);
 303
 304         tz->cooling_mode = mode;
 305
 306         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 307                 mode?"passive":"active"));
 308
 309         return_VALUE(0);
 310 }
 311
 312
 313 static int
 314 acpi_thermal_get_trip_points (
 315         struct acpi_thermal *tz)
 316 {
 317         acpi_status             status = AE_OK;
 318         int                     i = 0;
 319
 320         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 321
 322         if (!tz)
 323                 return_VALUE(-EINVAL);
 324
 325         /* Critical Shutdown (required) */
 326
 327         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 328                 &tz->trips.critical.temperature);
 329         if (ACPI_FAILURE(status)) {
 330                 tz->trips.critical.flags.valid = 0;
 331                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 332                 return_VALUE(-ENODEV);
 333         }
 334         else {
 335                 tz->trips.critical.flags.valid = 1;
 336                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found critical threshold [%lu]\n", tz->trips.critical.temperature));
 337         }
 338
 339         /* Critical Sleep (optional) */
 340
 341         status = acpi_evaluate_integer(tz->handle, "_HOT", NULL, &tz->trips.hot.temperature);
 342         if (ACPI_FAILURE(status)) {
 343                 tz->trips.hot.flags.valid = 0;
 344                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 345         }
 346         else {
 347                 tz->trips.hot.flags.valid = 1;
 348                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", tz->trips.hot.temperature));
 349         }
 350
 351         /* Passive: Processors (optional) */
 352
 353         status = acpi_evaluate_integer(tz->handle, "_PSV", NULL, &tz->trips.passive.temperature);
 354         if (ACPI_FAILURE(status)) {
 355                 tz->trips.passive.flags.valid = 0;
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 357         }
 358         else {
 359                 tz->trips.passive.flags.valid = 1;
 360
 361                 status = acpi_evaluate_integer(tz->handle, "_TC1", NULL, &tz->trips.passive.tc1);
 362                 if (ACPI_FAILURE(status))
 363                         tz->trips.passive.flags.valid = 0;
 364
 365                 status = acpi_evaluate_integer(tz->handle, "_TC2", NULL, &tz->trips.passive.tc2);
 366                 if (ACPI_FAILURE(status))
 367                         tz->trips.passive.flags.valid = 0;
 368
 369                 status = acpi_evaluate_integer(tz->handle, "_TSP", NULL, &tz->trips.passive.tsp);
 370                 if (ACPI_FAILURE(status))
 371                         tz->trips.passive.flags.valid = 0;
 372
 373                 status = acpi_evaluate_reference(tz->handle, "_PSL", NULL, &tz->trips.passive.devices);
 374                 if (ACPI_FAILURE(status))
 375                         tz->trips.passive.flags.valid = 0;
 376
 377                 if (!tz->trips.passive.flags.valid)
 378                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid passive threshold\n"));
 379                 else
 380                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found passive threshold [%lu]\n", tz->trips.passive.temperature));
 381         }
 382
 383         /* Active: Fans, etc. (optional) */
 384
 385         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 386
 387                 char name[5] = {'_','A','C',('0'+i),'\0'};
 388
 389                 status = acpi_evaluate_integer(tz->handle, name, NULL, &tz->trips.active[i].temperature);
 390                 if (ACPI_FAILURE(status))
 391                         break;
 392
 393                 name[2] = 'L';
 394                 status = acpi_evaluate_reference(tz->handle, name, NULL, &tz->trips.active[i].devices);
 395                 if (ACPI_SUCCESS(status)) {
 396                         tz->trips.active[i].flags.valid = 1;
 397                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found active threshold [%d]:[%lu]\n", i, tz->trips.active[i].temperature));
 398                 }
 399                 else
 400                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid active threshold [%d]\n", i));
 401         }
 402
 403         return_VALUE(0);
 404 }
 405
 406
 407 static int
 408 acpi_thermal_get_devices (
 409         struct acpi_thermal     *tz)
 410 {
 411         acpi_status             status = AE_OK;
 412
 413         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 414
 415         if (!tz)
 416                 return_VALUE(-EINVAL);
 417
 418         status = acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 419         if (ACPI_FAILURE(status))
 420                 return_VALUE(-ENODEV);
 421
 422         return_VALUE(0);
 423 }
 424
 425
 426 static int
 427 acpi_thermal_call_usermode (
 428         char                    *path)
 429 {
 430         char                    *argv[2] = {NULL, NULL};
 431         char                    *envp[3] = {NULL, NULL, NULL};
 432
 433         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 434
 435         if (!path)
 436                 return_VALUE(-EINVAL);
 437
 438         argv[0] = path;
 439
 440         /* minimal command environment */
 441         envp[0] = "HOME=/";
 442         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 443
 444         call_usermodehelper(argv[0], argv, envp, 0);
 445
 446         return_VALUE(0);
 447 }
 448
 449
 450 static int
 451 acpi_thermal_critical (
 452         struct acpi_thermal     *tz)
 453 {
 454         int                     result = 0;
 455         struct acpi_device      *device = NULL;
 456
 457         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 458
 459         if (!tz || !tz->trips.critical.flags.valid)
 460                 return_VALUE(-EINVAL);
 461
 462         if (tz->temperature >= tz->trips.critical.temperature) {
 463                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 464                 tz->trips.critical.flags.enabled = 1;
 465         }
 466         else if (tz->trips.critical.flags.enabled)
 467                 tz->trips.critical.flags.enabled = 0;
 468
 469         result = acpi_bus_get_device(tz->handle, &device);
 470         if (result)
 471                 return_VALUE(result);
 472
 473         printk(KERN_EMERG "Critical temperature reached (%ld C), shutting down.\n", KELVIN_TO_CELSIUS(tz->temperature));
 474         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL, tz->trips.critical.flags.enabled);
 475
 476         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 477
 478         return_VALUE(0);
 479 }
 480
 481
 482 static int
 483 acpi_thermal_hot (
 484         struct acpi_thermal     *tz)
 485 {
 486         int                     result = 0;
 487         struct acpi_device      *device = NULL;
 488
 489         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 490
 491         if (!tz || !tz->trips.hot.flags.valid)
 492                 return_VALUE(-EINVAL);
 493
 494         if (tz->temperature >= tz->trips.hot.temperature) {
 495                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 496                 tz->trips.hot.flags.enabled = 1;
 497         }
 498         else if (tz->trips.hot.flags.enabled)
 499                 tz->trips.hot.flags.enabled = 0;
 500
 501         result = acpi_bus_get_device(tz->handle, &device);
 502         if (result)
 503                 return_VALUE(result);
 504
 505         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT, tz->trips.hot.flags.enabled);
 506
 507         /* TBD: Call user-mode "sleep(S4)" function */
 508
 509         return_VALUE(0);
 510 }
 511
 512
 513 static int
 514 acpi_thermal_passive (
 515         struct acpi_thermal     *tz)
 516 {
 517         int                     result = 0;
 518         struct acpi_thermal_passive *passive = NULL;
 519         int                     trend = 0;
 520         int                     i = 0;
 521
 522         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 523
 524         if (!tz || !tz->trips.passive.flags.valid)
 525                 return_VALUE(-EINVAL);
 526
 527         passive = &(tz->trips.passive);
 528
 529         /*
 530          * Above Trip?
 531          * -----------
 532          * Calculate the thermal trend (using the passive cooling equation)
 533          * and modify the performance limit for all passive cooling devices
 534          * accordingly.  Note that we assume symmetry.
 535          */
 536         if (tz->temperature >= passive->temperature) {
 537                 trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature));
 538                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 539                         "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 540                         trend, passive->tc1, tz->temperature,
 541                         tz->last_temperature, passive->tc2,
 542                         tz->temperature, passive->temperature));
 543                 tz->trips.passive.flags.enabled = 1;
 544                 /* Heating up? */
 545                 if (trend > 0)
 546                         for (i=0; i<passive->devices.count; i++)
 547                                 acpi_processor_set_thermal_limit(
 548                                         passive->devices.handles[i],
 549                                         ACPI_PROCESSOR_LIMIT_INCREMENT);
 550                 /* Cooling off? */
 551                 else if (trend < 0)
 552                         for (i=0; i<passive->devices.count; i++)
 553                                 acpi_processor_set_thermal_limit(
 554                                         passive->devices.handles[i],
 555                                         ACPI_PROCESSOR_LIMIT_DECREMENT);
 556         }
 557
 558         /*
 559          * Below Trip?
 560          * -----------
 561          * Implement passive cooling hysteresis to slowly increase performance
 562          * and avoid thrashing around the passive trip point.  Note that we
 563          * assume symmetry.
 564          */
 565         else if (tz->trips.passive.flags.enabled) {
 566                 for (i=0; i<passive->devices.count; i++)
 567                         result = acpi_processor_set_thermal_limit(
 568                                 passive->devices.handles[i],
 569                                 ACPI_PROCESSOR_LIMIT_DECREMENT);
 570                 if (result == 1) {
 571                         tz->trips.passive.flags.enabled = 0;
 572                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 573                                 "Disabling passive cooling (zone is cool)\n"));
 574                 }
 575         }
 576
 577         return_VALUE(0);
 578 }
 579
 580
 581 static int
 582 acpi_thermal_active (
 583         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         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 592
 593         if (!tz)
 594                 return_VALUE(-EINVAL);
 595
 596         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 597
 598                 active = &(tz->trips.active[i]);
 599                 if (!active || !active->flags.valid)
 600                         break;
 601
 602                 /*
 603                  * Above Threshold?
 604                  * ----------------
 605                  * If not already enabled, turn ON all cooling devices
 606                  * associated with this active threshold.
 607                  */
 608                 if (tz->temperature >= active->temperature) {
 609                         if (active->temperature > maxtemp)
 610                                 tz->state.active_index = i, maxtemp = active->temperature;
 611                         if (!active->flags.enabled) {
 612                                 for (j = 0; j < active->devices.count; j++) {
 613                                         result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D0);
 614                                         if (result) {
 615                                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'on'\n", active->devices.handles[j]));
 616                                                 continue;
 617                                         }
 618                                         active->flags.enabled = 1;
 619                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'on'\n", active->devices.handles[j]));
 620                                 }
 621                         }
 622                 }
 623                 /*
 624                  * Below Threshold?
 625                  * ----------------
 626                  * Turn OFF all cooling devices associated with this
 627                  * threshold.
 628                  */
 629                 else if (active->flags.enabled) {
 630                         for (j = 0; j < active->devices.count; j++) {
 631                                 result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D3);
 632                                 if (result) {
 633                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'off'\n", active->devices.handles[j]));
 634                                         continue;
 635                                 }
 636                                 active->flags.enabled = 0;
 637                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'off'\n", active->devices.handles[j]));
 638                         }
 639                 }
 640         }
 641
 642         return_VALUE(0);
 643 }
 644
 645
 646 static void acpi_thermal_check (void *context);
 647
 648 static void
 649 acpi_thermal_run (
 650         unsigned long           data)
 651 {
 652         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 653         if (!tz->zombie)
 654                 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 655                         acpi_thermal_check, (void *) data);
 656 }
 657
 658
 659 static void
 660 acpi_thermal_check (
 661         void                    *data)
 662 {
 663         int                     result = 0;
 664         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 665         unsigned long           sleep_time = 0;
 666         int                     i = 0;
 667         struct acpi_thermal_state state;
 668
 669         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 670
 671         if (!tz) {
 672                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 673                 return_VOID;
 674         }
 675
 676         state = tz->state;
 677
 678         result = acpi_thermal_get_temperature(tz);
 679         if (result)
 680                 return_VOID;
 681
 682         memset(&tz->state, 0, sizeof(tz->state));
 683
 684         /*
 685          * Check Trip Points
 686          * -----------------
 687          * Compare the current temperature to the trip point values to see
 688          * if we've entered one of the thermal policy states.  Note that
 689          * this function determines when a state is entered, but the
 690          * individual policy decides when it is exited (e.g. hysteresis).
 691          */
 692         if (tz->trips.critical.flags.valid)
 693                 state.critical |= (tz->temperature >= tz->trips.critical.temperature);
 694         if (tz->trips.hot.flags.valid)
 695                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 696         if (tz->trips.passive.flags.valid)
 697                 state.passive |= (tz->temperature >= tz->trips.passive.temperature);
 698         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 699                 if (tz->trips.active[i].flags.valid)
 700                         state.active |= (tz->temperature >= tz->trips.active[i].temperature);
 701
 702         /*
 703          * Invoke Policy
 704          * -------------
 705          * Separated from the above check to allow individual policy to
 706          * determine when to exit a given state.
 707          */
 708         if (state.critical)
 709                 acpi_thermal_critical(tz);
 710         if (state.hot)
 711                 acpi_thermal_hot(tz);
 712         if (state.passive)
 713                 acpi_thermal_passive(tz);
 714         if (state.active)
 715                 acpi_thermal_active(tz);
 716
 717         /*
 718          * Calculate State
 719          * ---------------
 720          * Again, separated from the above two to allow independent policy
 721          * decisions.
 722          */
 723         if (tz->trips.critical.flags.enabled)
 724                 tz->state.critical = 1;
 725         if (tz->trips.hot.flags.enabled)
 726                 tz->state.hot = 1;
 727         if (tz->trips.passive.flags.enabled)
 728                 tz->state.passive = 1;
 729         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 730                 if (tz->trips.active[i].flags.enabled)
 731                         tz->state.active = 1;
 732
 733         /*
 734          * Calculate Sleep Time
 735          * --------------------
 736          * If we're in the passive state, use _TSP's value.  Otherwise
 737          * use the default polling frequency (e.g. _TZP).  If no polling
 738          * frequency is specified then we'll wait forever (at least until
 739          * a thermal event occurs).  Note that _TSP and _TZD values are
 740          * given in 1/10th seconds (we must covert to milliseconds).
 741          */
 742         if (tz->state.passive)
 743                 sleep_time = tz->trips.passive.tsp * 100;
 744         else if (tz->polling_frequency > 0)
 745                 sleep_time = tz->polling_frequency * 100;
 746
 747         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 748                 tz->name, tz->temperature, sleep_time));
 749
 750         /*
 751          * Schedule Next Poll
 752          * ------------------
 753          */
 754         if (!sleep_time) {
 755                 if (timer_pending(&(tz->timer)))
 756                         del_timer(&(tz->timer));
 757         }
 758         else {
 759                 if (timer_pending(&(tz->timer)))
 760                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 761                 else {
 762                         tz->timer.data = (unsigned long) tz;
 763                         tz->timer.function = acpi_thermal_run;
 764                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 765                         add_timer(&(tz->timer));
 766                 }
 767         }
 768
 769         return_VOID;
 770 }
 771
 772
 773 /* --------------------------------------------------------------------------
 774                               FS Interface (/proc)
 775    -------------------------------------------------------------------------- */
 776
 777 static struct proc_dir_entry    *acpi_thermal_dir;
 778
 779 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 780 {
 781         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 782
 783         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 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 && !tz->state.active)
 791                 seq_puts(seq, "ok\n");
 792         else {
 793                 if (tz->state.critical)
 794                         seq_puts(seq, "critical ");
 795                 if (tz->state.hot)
 796                         seq_puts(seq, "hot ");
 797                 if (tz->state.passive)
 798                         seq_puts(seq, "passive ");
 799                 if (tz->state.active)
 800                         seq_printf(seq, "active[%d]", tz->state.active_index);
 801                 seq_puts(seq, "\n");
 802         }
 803
 804 end:
 805         return_VALUE(0);
 806 }
 807
 808 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 809 {
 810         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 811 }
 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 = (struct acpi_thermal *)seq->private;
 818
 819         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 820
 821         if (!tz)
 822                 goto end;
 823
 824         result = acpi_thermal_get_temperature(tz);
 825         if (result)
 826                 goto end;
 827
 828         seq_printf(seq, "temperature:             %ld C\n",
 829                 KELVIN_TO_CELSIUS(tz->temperature));
 830
 831 end:
 832         return_VALUE(0);
 833 }
 834
 835 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 836 {
 837         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 838 }
 839
 840
 841 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 842 {
 843         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 844         int                     i = 0;
 845         int                     j = 0;
 846
 847         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 848
 849         if (!tz)
 850                 goto end;
 851
 852         if (tz->trips.critical.flags.valid)
 853                 seq_printf(seq, "critical (S5):           %ld C\n",
 854                         KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 855
 856         if (tz->trips.hot.flags.valid)
 857                 seq_printf(seq, "hot (S4):                %ld C\n",
 858                         KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 859
 860         if (tz->trips.passive.flags.valid) {
 861                 seq_printf(seq, "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 862                         KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 863                         tz->trips.passive.tc1,
 864                         tz->trips.passive.tc2,
 865                         tz->trips.passive.tsp);
 866                 for (j=0; j<tz->trips.passive.devices.count; j++) {
 867
 868                         seq_printf(seq, "0x%p ", tz->trips.passive.devices.handles[j]);
 869                 }
 870                 seq_puts(seq, "\n");
 871         }
 872
 873         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 874                 if (!(tz->trips.active[i].flags.valid))
 875                         break;
 876                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 877                         i, KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 878                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 879                         seq_printf(seq, "0x%p ",
 880                                 tz->trips.active[i].devices.handles[j]);
 881                 seq_puts(seq, "\n");
 882         }
 883
 884 end:
 885         return_VALUE(0);
 886 }
 887
 888 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 889 {
 890         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 891 }
 892
 893 static ssize_t
 894 acpi_thermal_write_trip_points (
 895         struct file             *file,
 896         const char              __user *buffer,
 897         size_t                  count,
 898         loff_t                  *ppos)
 899 {
 900         struct seq_file         *m = (struct seq_file *)file->private_data;
 901         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
 902
 903         char                    *limit_string;
 904         int                     num, critical, hot, passive;
 905         int                     *active;
 906         int                     i = 0;
 907
 908         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 909
 910         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 911         if(!limit_string)
 912                 return_VALUE(-ENOMEM);
 913
 914         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 915
 916         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE *sizeof(int), GFP_KERNEL);
 917         if(!active)
 918                 return_VALUE(-ENOMEM);
 919
 920         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 921                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 922                 count = -EINVAL;
 923                 goto end;
 924         }
 925
 926         if (copy_from_user(limit_string, buffer, count)) {
 927                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 928                 count = -EFAULT;
 929                 goto end;
 930         }
 931
 932         limit_string[count] = '\0';
 933
 934         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 935                                 &critical, &hot, &passive,
 936                                 &active[0], &active[1], &active[2], &active[3], &active[4],
 937                                 &active[5], &active[6], &active[7], &active[8], &active[9]);
 938         if(!(num >=5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 939                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 940                 count = -EINVAL;
 941                 goto end;
 942         }
 943
 944         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 945         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 946         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 947         for (i = 0; i < num - 3; i++) {
 948                 if (!(tz->trips.active[i].flags.valid))
 949                         break;
 950                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 951         }
 952
 953 end:
 954         kfree(active);
 955         kfree(limit_string);
 956         return_VALUE(count);
 957 }
 958
 959
 960 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 961 {
 962         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 963
 964         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 965
 966         if (!tz)
 967                 goto end;
 968
 969         if (!tz->flags.cooling_mode) {
 970                 seq_puts(seq, "<setting not supported>\n");
 971         }
 972
 973         if ( tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL )
 974                 seq_printf(seq, "cooling mode:  critical\n");
 975         else
 976                 seq_printf(seq, "cooling mode:  %s\n",
 977                         tz->cooling_mode?"passive":"active");
 978
 979 end:
 980         return_VALUE(0);
 981 }
 982
 983 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 984 {
 985         return single_open(file, acpi_thermal_cooling_seq_show,
 986                                                         PDE(inode)->data);
 987 }
 988
 989 static ssize_t
 990 acpi_thermal_write_cooling_mode (
 991         struct file             *file,
 992         const char              __user *buffer,
 993         size_t                  count,
 994         loff_t                  *ppos)
 995 {
 996         struct seq_file         *m = (struct seq_file *)file->private_data;
 997         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
 998         int                     result = 0;
 999         char                    mode_string[12] = {'\0'};
1000
1001         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1002
1003         if (!tz || (count > sizeof(mode_string) - 1))
1004                 return_VALUE(-EINVAL);
1005
1006         if (!tz->flags.cooling_mode)
1007                 return_VALUE(-ENODEV);
1008
1009         if (copy_from_user(mode_string, buffer, count))
1010                 return_VALUE(-EFAULT);
1011
1012         mode_string[count] = '\0';
1013
1014         result = acpi_thermal_set_cooling_mode(tz,
1015                 simple_strtoul(mode_string, NULL, 0));
1016         if (result)
1017                 return_VALUE(result);
1018
1019         acpi_thermal_check(tz);
1020
1021         return_VALUE(count);
1022 }
1023
1024
1025 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1026 {
1027         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
1028
1029         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1030
1031         if (!tz)
1032                 goto end;
1033
1034         if (!tz->polling_frequency) {
1035                 seq_puts(seq, "<polling disabled>\n");
1036                 goto end;
1037         }
1038
1039         seq_printf(seq, "polling frequency:       %lu seconds\n",
1040                 (tz->polling_frequency / 10));
1041
1042 end:
1043         return_VALUE(0);
1044 }
1045
1046 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1047 {
1048         return single_open(file, acpi_thermal_polling_seq_show,
1049                                                         PDE(inode)->data);
1050 }
1051
1052 static ssize_t
1053 acpi_thermal_write_polling (
1054         struct file             *file,
1055         const char              __user *buffer,
1056         size_t                  count,
1057         loff_t                  *ppos)
1058 {
1059         struct seq_file         *m = (struct seq_file *)file->private_data;
1060         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
1061         int                     result = 0;
1062         char                    polling_string[12] = {'\0'};
1063         int                     seconds = 0;
1064
1065         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1066
1067         if (!tz || (count > sizeof(polling_string) - 1))
1068                 return_VALUE(-EINVAL);
1069
1070         if (copy_from_user(polling_string, buffer, count))
1071                 return_VALUE(-EFAULT);
1072
1073         polling_string[count] = '\0';
1074
1075         seconds = simple_strtoul(polling_string, NULL, 0);
1076
1077         result = acpi_thermal_set_polling(tz, seconds);
1078         if (result)
1079                 return_VALUE(result);
1080
1081         acpi_thermal_check(tz);
1082
1083         return_VALUE(count);
1084 }
1085
1086
1087 static int
1088 acpi_thermal_add_fs (
1089         struct acpi_device      *device)
1090 {
1091         struct proc_dir_entry   *entry = NULL;
1092
1093         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1094
1095         if (!acpi_device_dir(device)) {
1096                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1097                         acpi_thermal_dir);
1098                 if (!acpi_device_dir(device))
1099                         return_VALUE(-ENODEV);
1100                 acpi_device_dir(device)->owner = THIS_MODULE;
1101         }
1102
1103         /* 'state' [R] */
1104         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1105                 S_IRUGO, acpi_device_dir(device));
1106         if (!entry)
1107                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1108                         "Unable to create '%s' fs entry\n",
1109                         ACPI_THERMAL_FILE_STATE));
1110         else {
1111                 entry->proc_fops = &acpi_thermal_state_fops;
1112                 entry->data = acpi_driver_data(device);
1113                 entry->owner = THIS_MODULE;
1114         }
1115
1116         /* 'temperature' [R] */
1117         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1118                 S_IRUGO, acpi_device_dir(device));
1119         if (!entry)
1120                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1121                         "Unable to create '%s' fs entry\n",
1122                         ACPI_THERMAL_FILE_TEMPERATURE));
1123         else {
1124                 entry->proc_fops = &acpi_thermal_temp_fops;
1125                 entry->data = acpi_driver_data(device);
1126                 entry->owner = THIS_MODULE;
1127         }
1128
1129         /* 'trip_points' [R/W] */
1130         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1131                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1132         if (!entry)
1133                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1134                         "Unable to create '%s' fs entry\n",
1135                         ACPI_THERMAL_FILE_TRIP_POINTS));
1136         else {
1137                 entry->proc_fops = &acpi_thermal_trip_fops;
1138                 entry->data = acpi_driver_data(device);
1139                 entry->owner = THIS_MODULE;
1140         }
1141
1142         /* 'cooling_mode' [R/W] */
1143         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1144                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1145         if (!entry)
1146                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1147                         "Unable to create '%s' fs entry\n",
1148                         ACPI_THERMAL_FILE_COOLING_MODE));
1149         else {
1150                 entry->proc_fops = &acpi_thermal_cooling_fops;
1151                 entry->data = acpi_driver_data(device);
1152                 entry->owner = THIS_MODULE;
1153         }
1154
1155         /* 'polling_frequency' [R/W] */
1156         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1157                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1158         if (!entry)
1159                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1160                         "Unable to create '%s' fs entry\n",
1161                         ACPI_THERMAL_FILE_POLLING_FREQ));
1162         else {
1163                 entry->proc_fops = &acpi_thermal_polling_fops;
1164                 entry->data = acpi_driver_data(device);
1165                 entry->owner = THIS_MODULE;
1166         }
1167
1168         return_VALUE(0);
1169 }
1170
1171
1172 static int
1173 acpi_thermal_remove_fs (
1174         struct acpi_device      *device)
1175 {
1176         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1177
1178         if (acpi_device_dir(device)) {
1179                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1180                                   acpi_device_dir(device));
1181                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1182                                   acpi_device_dir(device));
1183                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1184                                   acpi_device_dir(device));
1185                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1186                                   acpi_device_dir(device));
1187                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1188                                   acpi_device_dir(device));
1189                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1190                 acpi_device_dir(device) = NULL;
1191         }
1192
1193         return_VALUE(0);
1194 }
1195
1196
1197 /* --------------------------------------------------------------------------
1198                                  Driver Interface
1199    -------------------------------------------------------------------------- */
1200
1201 static void
1202 acpi_thermal_notify (
1203         acpi_handle             handle,
1204         u32                     event,
1205         void                    *data)
1206 {
1207         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
1208         struct acpi_device      *device = NULL;
1209
1210         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1211
1212         if (!tz)
1213                 return_VOID;
1214
1215         if (acpi_bus_get_device(tz->handle, &device))
1216                 return_VOID;
1217
1218         switch (event) {
1219         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1220                 acpi_thermal_check(tz);
1221                 break;
1222         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1223                 acpi_thermal_get_trip_points(tz);
1224                 acpi_thermal_check(tz);
1225                 acpi_bus_generate_event(device, event, 0);
1226                 break;
1227         case ACPI_THERMAL_NOTIFY_DEVICES:
1228                 if (tz->flags.devices)
1229                         acpi_thermal_get_devices(tz);
1230                 acpi_bus_generate_event(device, event, 0);
1231                 break;
1232         default:
1233                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1234                         "Unsupported event [0x%x]\n", event));
1235                 break;
1236         }
1237
1238         return_VOID;
1239 }
1240
1241
1242 static int
1243 acpi_thermal_get_info (
1244         struct acpi_thermal     *tz)
1245 {
1246         int                     result = 0;
1247
1248         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1249
1250         if (!tz)
1251                 return_VALUE(-EINVAL);
1252
1253         /* Get temperature [_TMP] (required) */
1254         result = acpi_thermal_get_temperature(tz);
1255         if (result)
1256                 return_VALUE(result);
1257
1258         /* Get trip points [_CRT, _PSV, etc.] (required) */
1259         result = acpi_thermal_get_trip_points(tz);
1260         if (result)
1261                 return_VALUE(result);
1262
1263         /* Set the cooling mode [_SCP] to active cooling (default) */
1264         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1265         if (!result)
1266                 tz->flags.cooling_mode = 1;
1267         else {
1268                 /* Oh,we have not _SCP method.
1269                    Generally show cooling_mode by _ACx, _PSV,spec 12.2*/
1270                 tz->flags.cooling_mode = 0;
1271                 if ( tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) {
1272                         if ( tz->trips.passive.temperature > tz->trips.active[0].temperature )
1273                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1274                         else
1275                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1276                 } else if ( !tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) {
1277                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1278                 } else if ( tz->trips.active[0].flags.valid && !tz->trips.passive.flags.valid ) {
1279                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1280                 } else {
1281                         /* _ACx and _PSV are optional, but _CRT is required */
1282                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1283                 }
1284         }
1285
1286         /* Get default polling frequency [_TZP] (optional) */
1287         if (tzp)
1288                 tz->polling_frequency = tzp;
1289         else
1290                 acpi_thermal_get_polling_frequency(tz);
1291
1292         /* Get devices in this thermal zone [_TZD] (optional) */
1293         result = acpi_thermal_get_devices(tz);
1294         if (!result)
1295                 tz->flags.devices = 1;
1296
1297         return_VALUE(0);
1298 }
1299
1300
1301 static int
1302 acpi_thermal_add (
1303         struct acpi_device              *device)
1304 {
1305         int                     result = 0;
1306         acpi_status             status = AE_OK;
1307         struct acpi_thermal     *tz = NULL;
1308
1309         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1310
1311         if (!device)
1312                 return_VALUE(-EINVAL);
1313
1314         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1315         if (!tz)
1316                 return_VALUE(-ENOMEM);
1317         memset(tz, 0, sizeof(struct acpi_thermal));
1318
1319         tz->handle = device->handle;
1320         strcpy(tz->name, device->pnp.bus_id);
1321         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1322         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1323         acpi_driver_data(device) = tz;
1324
1325         result = acpi_thermal_get_info(tz);
1326         if (result)
1327                 goto end;
1328
1329         result = acpi_thermal_add_fs(device);
1330         if (result)
1331                 return_VALUE(result);
1332
1333         init_timer(&tz->timer);
1334
1335         acpi_thermal_check(tz);
1336
1337         status = acpi_install_notify_handler(tz->handle,
1338                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify, tz);
1339         if (ACPI_FAILURE(status)) {
1340                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1341                         "Error installing notify handler\n"));
1342                 result = -ENODEV;
1343                 goto end;
1344         }
1345
1346         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1347                 acpi_device_name(device), acpi_device_bid(device),
1348                 KELVIN_TO_CELSIUS(tz->temperature));
1349
1350 end:
1351         if (result) {
1352                 acpi_thermal_remove_fs(device);
1353                 kfree(tz);
1354         }
1355
1356         return_VALUE(result);
1357 }
1358
1359
1360 static int
1361 acpi_thermal_remove (
1362         struct acpi_device      *device,
1363         int                     type)
1364 {
1365         acpi_status             status = AE_OK;
1366         struct acpi_thermal     *tz = NULL;
1367
1368         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1369
1370         if (!device || !acpi_driver_data(device))
1371                 return_VALUE(-EINVAL);
1372
1373         tz = (struct acpi_thermal *) acpi_driver_data(device);
1374
1375         /* avoid timer adding new defer task */
1376         tz->zombie = 1;
1377         /* wait for running timer (on other CPUs) finish */
1378         del_timer_sync(&(tz->timer));
1379         /* synchronize deferred task */
1380         acpi_os_wait_events_complete(NULL);
1381         /* deferred task may reinsert timer */
1382         del_timer_sync(&(tz->timer));
1383
1384         status = acpi_remove_notify_handler(tz->handle,
1385                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify);
1386         if (ACPI_FAILURE(status))
1387                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1388                         "Error removing notify handler\n"));
1389
1390         /* Terminate policy */
1391         if (tz->trips.passive.flags.valid
1392                 && tz->trips.passive.flags.enabled) {
1393                 tz->trips.passive.flags.enabled = 0;
1394                 acpi_thermal_passive(tz);
1395         }
1396         if (tz->trips.active[0].flags.valid
1397                 && tz->trips.active[0].flags.enabled) {
1398                 tz->trips.active[0].flags.enabled = 0;
1399                 acpi_thermal_active(tz);
1400         }
1401
1402         acpi_thermal_remove_fs(device);
1403
1404         kfree(tz);
1405         return_VALUE(0);
1406 }
1407
1408
1409 static int __init
1410 acpi_thermal_init (void)
1411 {
1412         int                     result = 0;
1413
1414         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1415
1416         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1417         if (!acpi_thermal_dir)
1418                 return_VALUE(-ENODEV);
1419         acpi_thermal_dir->owner = THIS_MODULE;
1420
1421         result = acpi_bus_register_driver(&acpi_thermal_driver);
1422         if (result < 0) {
1423                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1424                 return_VALUE(-ENODEV);
1425         }
1426
1427         return_VALUE(0);
1428 }
1429
1430
1431 static void __exit
1432 acpi_thermal_exit (void)
1433 {
1434         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1435
1436         acpi_bus_unregister_driver(&acpi_thermal_driver);
1437
1438         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1439
1440         return_VOID;
1441 }
1442
1443
1444 module_init(acpi_thermal_init);
1445 module_exit(acpi_thermal_exit);