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 static int acpi_thermal_add(struct acpi_device *device);
  84 static int acpi_thermal_remove(struct acpi_device *device, int type);
  85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_trip_points(struct file *,
  89                                               const char __user *, size_t,
  90                                               loff_t *);
  91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  93                                                const char __user *, size_t,
  94                                                loff_t *);
  95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  97                                           size_t, loff_t *);
  98
  99 static struct acpi_driver acpi_thermal_driver = {
 100         .name = ACPI_THERMAL_DRIVER_NAME,
 101         .class = ACPI_THERMAL_CLASS,
 102         .ids = ACPI_THERMAL_HID,
 103         .ops = {
 104                 .add = acpi_thermal_add,
 105                 .remove = acpi_thermal_remove,
 106                 },
 107 };
 108
 109 struct acpi_thermal_state {
 110         u8 critical:1;
 111         u8 hot:1;
 112         u8 passive:1;
 113         u8 active:1;
 114         u8 reserved:4;
 115         int active_index;
 116 };
 117
 118 struct acpi_thermal_state_flags {
 119         u8 valid:1;
 120         u8 enabled:1;
 121         u8 reserved:6;
 122 };
 123
 124 struct acpi_thermal_critical {
 125         struct acpi_thermal_state_flags flags;
 126         unsigned long temperature;
 127 };
 128
 129 struct acpi_thermal_hot {
 130         struct acpi_thermal_state_flags flags;
 131         unsigned long temperature;
 132 };
 133
 134 struct acpi_thermal_passive {
 135         struct acpi_thermal_state_flags flags;
 136         unsigned long temperature;
 137         unsigned long tc1;
 138         unsigned long tc2;
 139         unsigned long tsp;
 140         struct acpi_handle_list devices;
 141 };
 142
 143 struct acpi_thermal_active {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146         struct acpi_handle_list devices;
 147 };
 148
 149 struct acpi_thermal_trips {
 150         struct acpi_thermal_critical critical;
 151         struct acpi_thermal_hot hot;
 152         struct acpi_thermal_passive passive;
 153         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 154 };
 155
 156 struct acpi_thermal_flags {
 157         u8 cooling_mode:1;      /* _SCP */
 158         u8 devices:1;           /* _TZD */
 159         u8 reserved:6;
 160 };
 161
 162 struct acpi_thermal {
 163         acpi_handle handle;
 164         acpi_bus_id name;
 165         unsigned long temperature;
 166         unsigned long last_temperature;
 167         unsigned long polling_frequency;
 168         u8 cooling_mode;
 169         volatile u8 zombie;
 170         struct acpi_thermal_flags flags;
 171         struct acpi_thermal_state state;
 172         struct acpi_thermal_trips trips;
 173         struct acpi_handle_list devices;
 174         struct timer_list timer;
 175 };
 176
 177 static struct file_operations acpi_thermal_state_fops = {
 178         .open = acpi_thermal_state_open_fs,
 179         .read = seq_read,
 180         .llseek = seq_lseek,
 181         .release = single_release,
 182 };
 183
 184 static struct file_operations acpi_thermal_temp_fops = {
 185         .open = acpi_thermal_temp_open_fs,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static struct file_operations acpi_thermal_trip_fops = {
 192         .open = acpi_thermal_trip_open_fs,
 193         .read = seq_read,
 194         .write = acpi_thermal_write_trip_points,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static struct file_operations acpi_thermal_cooling_fops = {
 200         .open = acpi_thermal_cooling_open_fs,
 201         .read = seq_read,
 202         .write = acpi_thermal_write_cooling_mode,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static struct file_operations acpi_thermal_polling_fops = {
 208         .open = acpi_thermal_polling_open_fs,
 209         .read = seq_read,
 210         .write = acpi_thermal_write_polling,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 /* --------------------------------------------------------------------------
 216                              Thermal Zone Management
 217    -------------------------------------------------------------------------- */
 218
 219 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 220 {
 221         acpi_status status = AE_OK;
 222
 223         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 224
 225         if (!tz)
 226                 return_VALUE(-EINVAL);
 227
 228         tz->last_temperature = tz->temperature;
 229
 230         status =
 231             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 232         if (ACPI_FAILURE(status))
 233                 return_VALUE(-ENODEV);
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 236                           tz->temperature));
 237
 238         return_VALUE(0);
 239 }
 240
 241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 246
 247         if (!tz)
 248                 return_VALUE(-EINVAL);
 249
 250         status =
 251             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
 252                                   &tz->polling_frequency);
 253         if (ACPI_FAILURE(status))
 254                 return_VALUE(-ENODEV);
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 257                           tz->polling_frequency));
 258
 259         return_VALUE(0);
 260 }
 261
 262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, 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,
 272                           "Polling frequency set to %lu seconds\n",
 273                           tz->polling_frequency));
 274
 275         return_VALUE(0);
 276 }
 277
 278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 279 {
 280         acpi_status status = AE_OK;
 281         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 282         struct acpi_object_list arg_list = { 1, &arg0 };
 283         acpi_handle handle = NULL;
 284
 285         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 286
 287         if (!tz)
 288                 return_VALUE(-EINVAL);
 289
 290         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 291         if (ACPI_FAILURE(status)) {
 292                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 293                 return_VALUE(-ENODEV);
 294         }
 295
 296         arg0.integer.value = mode;
 297
 298         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 299         if (ACPI_FAILURE(status))
 300                 return_VALUE(-ENODEV);
 301
 302         tz->cooling_mode = mode;
 303
 304         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 305                           mode ? "passive" : "active"));
 306
 307         return_VALUE(0);
 308 }
 309
 310 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 311 {
 312         acpi_status status = AE_OK;
 313         int i = 0;
 314
 315         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 316
 317         if (!tz)
 318                 return_VALUE(-EINVAL);
 319
 320         /* Critical Shutdown (required) */
 321
 322         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 323                                        &tz->trips.critical.temperature);
 324         if (ACPI_FAILURE(status)) {
 325                 tz->trips.critical.flags.valid = 0;
 326                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 327                 return_VALUE(-ENODEV);
 328         } else {
 329                 tz->trips.critical.flags.valid = 1;
 330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 331                                   "Found critical threshold [%lu]\n",
 332                                   tz->trips.critical.temperature));
 333         }
 334
 335         /* Critical Sleep (optional) */
 336
 337         status =
 338             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
 339                                   &tz->trips.hot.temperature);
 340         if (ACPI_FAILURE(status)) {
 341                 tz->trips.hot.flags.valid = 0;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 343         } else {
 344                 tz->trips.hot.flags.valid = 1;
 345                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 346                                   tz->trips.hot.temperature));
 347         }
 348
 349         /* Passive: Processors (optional) */
 350
 351         status =
 352             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
 353                                   &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         } else {
 358                 tz->trips.passive.flags.valid = 1;
 359
 360                 status =
 361                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
 362                                           &tz->trips.passive.tc1);
 363                 if (ACPI_FAILURE(status))
 364                         tz->trips.passive.flags.valid = 0;
 365
 366                 status =
 367                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
 368                                           &tz->trips.passive.tc2);
 369                 if (ACPI_FAILURE(status))
 370                         tz->trips.passive.flags.valid = 0;
 371
 372                 status =
 373                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
 374                                           &tz->trips.passive.tsp);
 375                 if (ACPI_FAILURE(status))
 376                         tz->trips.passive.flags.valid = 0;
 377
 378                 status =
 379                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
 380                                             &tz->trips.passive.devices);
 381                 if (ACPI_FAILURE(status))
 382                         tz->trips.passive.flags.valid = 0;
 383
 384                 if (!tz->trips.passive.flags.valid)
 385                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 386                                           "Invalid passive threshold\n"));
 387                 else
 388                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 389                                           "Found passive threshold [%lu]\n",
 390                                           tz->trips.passive.temperature));
 391         }
 392
 393         /* Active: Fans, etc. (optional) */
 394
 395         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 396
 397                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 398
 399                 status =
 400                     acpi_evaluate_integer(tz->handle, name, NULL,
 401                                           &tz->trips.active[i].temperature);
 402                 if (ACPI_FAILURE(status))
 403                         break;
 404
 405                 name[2] = 'L';
 406                 status =
 407                     acpi_evaluate_reference(tz->handle, name, NULL,
 408                                             &tz->trips.active[i].devices);
 409                 if (ACPI_SUCCESS(status)) {
 410                         tz->trips.active[i].flags.valid = 1;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                           "Found active threshold [%d]:[%lu]\n",
 413                                           i, tz->trips.active[i].temperature));
 414                 } else
 415                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 416                                           "Invalid active threshold [%d]\n",
 417                                           i));
 418         }
 419
 420         return_VALUE(0);
 421 }
 422
 423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 424 {
 425         acpi_status status = AE_OK;
 426
 427         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 428
 429         if (!tz)
 430                 return_VALUE(-EINVAL);
 431
 432         status =
 433             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 434         if (ACPI_FAILURE(status))
 435                 return_VALUE(-ENODEV);
 436
 437         return_VALUE(0);
 438 }
 439
 440 static int acpi_thermal_call_usermode(char *path)
 441 {
 442         char *argv[2] = { NULL, NULL };
 443         char *envp[3] = { NULL, NULL, NULL };
 444
 445         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 446
 447         if (!path)
 448                 return_VALUE(-EINVAL);
 449
 450         argv[0] = path;
 451
 452         /* minimal command environment */
 453         envp[0] = "HOME=/";
 454         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 455
 456         call_usermodehelper(argv[0], argv, envp, 0);
 457
 458         return_VALUE(0);
 459 }
 460
 461 static int acpi_thermal_critical(struct acpi_thermal *tz)
 462 {
 463         int result = 0;
 464         struct acpi_device *device = NULL;
 465
 466         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 467
 468         if (!tz || !tz->trips.critical.flags.valid)
 469                 return_VALUE(-EINVAL);
 470
 471         if (tz->temperature >= tz->trips.critical.temperature) {
 472                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 473                 tz->trips.critical.flags.enabled = 1;
 474         } else if (tz->trips.critical.flags.enabled)
 475                 tz->trips.critical.flags.enabled = 0;
 476
 477         result = acpi_bus_get_device(tz->handle, &device);
 478         if (result)
 479                 return_VALUE(result);
 480
 481         printk(KERN_EMERG
 482                "Critical temperature reached (%ld C), shutting down.\n",
 483                KELVIN_TO_CELSIUS(tz->temperature));
 484         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
 485                                 tz->trips.critical.flags.enabled);
 486
 487         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 488
 489         return_VALUE(0);
 490 }
 491
 492 static int acpi_thermal_hot(struct acpi_thermal *tz)
 493 {
 494         int result = 0;
 495         struct acpi_device *device = NULL;
 496
 497         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 498
 499         if (!tz || !tz->trips.hot.flags.valid)
 500                 return_VALUE(-EINVAL);
 501
 502         if (tz->temperature >= tz->trips.hot.temperature) {
 503                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 504                 tz->trips.hot.flags.enabled = 1;
 505         } else if (tz->trips.hot.flags.enabled)
 506                 tz->trips.hot.flags.enabled = 0;
 507
 508         result = acpi_bus_get_device(tz->handle, &device);
 509         if (result)
 510                 return_VALUE(result);
 511
 512         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
 513                                 tz->trips.hot.flags.enabled);
 514
 515         /* TBD: Call user-mode "sleep(S4)" function */
 516
 517         return_VALUE(0);
 518 }
 519
 520 static int acpi_thermal_passive(struct acpi_thermal *tz)
 521 {
 522         int result = 0;
 523         struct acpi_thermal_passive *passive = NULL;
 524         int trend = 0;
 525         int i = 0;
 526
 527         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 528
 529         if (!tz || !tz->trips.passive.flags.valid)
 530                 return_VALUE(-EINVAL);
 531
 532         passive = &(tz->trips.passive);
 533
 534         /*
 535          * Above Trip?
 536          * -----------
 537          * Calculate the thermal trend (using the passive cooling equation)
 538          * and modify the performance limit for all passive cooling devices
 539          * accordingly.  Note that we assume symmetry.
 540          */
 541         if (tz->temperature >= passive->temperature) {
 542                 trend =
 543                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 544                     (passive->tc2 * (tz->temperature - passive->temperature));
 545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 546                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 547                                   trend, passive->tc1, tz->temperature,
 548                                   tz->last_temperature, passive->tc2,
 549                                   tz->temperature, passive->temperature));
 550                 tz->trips.passive.flags.enabled = 1;
 551                 /* Heating up? */
 552                 if (trend > 0)
 553                         for (i = 0; i < passive->devices.count; i++)
 554                                 acpi_processor_set_thermal_limit(passive->
 555                                                                  devices.
 556                                                                  handles[i],
 557                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 558                 /* Cooling off? */
 559                 else if (trend < 0)
 560                         for (i = 0; i < passive->devices.count; i++)
 561                                 acpi_processor_set_thermal_limit(passive->
 562                                                                  devices.
 563                                                                  handles[i],
 564                                                                  ACPI_PROCESSOR_LIMIT_DECREMENT);
 565         }
 566
 567         /*
 568          * Below Trip?
 569          * -----------
 570          * Implement passive cooling hysteresis to slowly increase performance
 571          * and avoid thrashing around the passive trip point.  Note that we
 572          * assume symmetry.
 573          */
 574         else if (tz->trips.passive.flags.enabled) {
 575                 for (i = 0; i < passive->devices.count; i++)
 576                         result =
 577                             acpi_processor_set_thermal_limit(passive->devices.
 578                                                              handles[i],
 579                                                              ACPI_PROCESSOR_LIMIT_DECREMENT);
 580                 if (result == 1) {
 581                         tz->trips.passive.flags.enabled = 0;
 582                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 583                                           "Disabling passive cooling (zone is cool)\n"));
 584                 }
 585         }
 586
 587         return_VALUE(0);
 588 }
 589
 590 static int acpi_thermal_active(struct acpi_thermal *tz)
 591 {
 592         int result = 0;
 593         struct acpi_thermal_active *active = NULL;
 594         int i = 0;
 595         int j = 0;
 596         unsigned long maxtemp = 0;
 597
 598         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 599
 600         if (!tz)
 601                 return_VALUE(-EINVAL);
 602
 603         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 604
 605                 active = &(tz->trips.active[i]);
 606                 if (!active || !active->flags.valid)
 607                         break;
 608
 609                 /*
 610                  * Above Threshold?
 611                  * ----------------
 612                  * If not already enabled, turn ON all cooling devices
 613                  * associated with this active threshold.
 614                  */
 615                 if (tz->temperature >= active->temperature) {
 616                         if (active->temperature > maxtemp)
 617                                 tz->state.active_index = i, maxtemp =
 618                                     active->temperature;
 619                         if (!active->flags.enabled) {
 620                                 for (j = 0; j < active->devices.count; j++) {
 621                                         result =
 622                                             acpi_bus_set_power(active->devices.
 623                                                                handles[j],
 624                                                                ACPI_STATE_D0);
 625                                         if (result) {
 626                                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 627                                                                   "Unable to turn cooling device [%p] 'on'\n",
 628                                                                   active->
 629                                                                   devices.
 630                                                                   handles[j]));
 631                                                 continue;
 632                                         }
 633                                         active->flags.enabled = 1;
 634                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 635                                                           "Cooling device [%p] now 'on'\n",
 636                                                           active->devices.
 637                                                           handles[j]));
 638                                 }
 639                         }
 640                 }
 641                 /*
 642                  * Below Threshold?
 643                  * ----------------
 644                  * Turn OFF all cooling devices associated with this
 645                  * threshold.
 646                  */
 647                 else if (active->flags.enabled) {
 648                         for (j = 0; j < active->devices.count; j++) {
 649                                 result =
 650                                     acpi_bus_set_power(active->devices.
 651                                                        handles[j],
 652                                                        ACPI_STATE_D3);
 653                                 if (result) {
 654                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 655                                                           "Unable to turn cooling device [%p] 'off'\n",
 656                                                           active->devices.
 657                                                           handles[j]));
 658                                         continue;
 659                                 }
 660                                 active->flags.enabled = 0;
 661                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 662                                                   "Cooling device [%p] now 'off'\n",
 663                                                   active->devices.handles[j]));
 664                         }
 665                 }
 666         }
 667
 668         return_VALUE(0);
 669 }
 670
 671 static void acpi_thermal_check(void *context);
 672
 673 static void acpi_thermal_run(unsigned long data)
 674 {
 675         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 676         if (!tz->zombie)
 677                 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 678                                             acpi_thermal_check, (void *)data);
 679 }
 680
 681 static void acpi_thermal_check(void *data)
 682 {
 683         int result = 0;
 684         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 685         unsigned long sleep_time = 0;
 686         int i = 0;
 687         struct acpi_thermal_state state;
 688
 689         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 690
 691         if (!tz) {
 692                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 693                 return_VOID;
 694         }
 695
 696         state = tz->state;
 697
 698         result = acpi_thermal_get_temperature(tz);
 699         if (result)
 700                 return_VOID;
 701
 702         memset(&tz->state, 0, sizeof(tz->state));
 703
 704         /*
 705          * Check Trip Points
 706          * -----------------
 707          * Compare the current temperature to the trip point values to see
 708          * if we've entered one of the thermal policy states.  Note that
 709          * this function determines when a state is entered, but the
 710          * individual policy decides when it is exited (e.g. hysteresis).
 711          */
 712         if (tz->trips.critical.flags.valid)
 713                 state.critical |=
 714                     (tz->temperature >= tz->trips.critical.temperature);
 715         if (tz->trips.hot.flags.valid)
 716                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 717         if (tz->trips.passive.flags.valid)
 718                 state.passive |=
 719                     (tz->temperature >= tz->trips.passive.temperature);
 720         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 721                 if (tz->trips.active[i].flags.valid)
 722                         state.active |=
 723                             (tz->temperature >=
 724                              tz->trips.active[i].temperature);
 725
 726         /*
 727          * Invoke Policy
 728          * -------------
 729          * Separated from the above check to allow individual policy to
 730          * determine when to exit a given state.
 731          */
 732         if (state.critical)
 733                 acpi_thermal_critical(tz);
 734         if (state.hot)
 735                 acpi_thermal_hot(tz);
 736         if (state.passive)
 737                 acpi_thermal_passive(tz);
 738         if (state.active)
 739                 acpi_thermal_active(tz);
 740
 741         /*
 742          * Calculate State
 743          * ---------------
 744          * Again, separated from the above two to allow independent policy
 745          * decisions.
 746          */
 747         if (tz->trips.critical.flags.enabled)
 748                 tz->state.critical = 1;
 749         if (tz->trips.hot.flags.enabled)
 750                 tz->state.hot = 1;
 751         if (tz->trips.passive.flags.enabled)
 752                 tz->state.passive = 1;
 753         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 754                 if (tz->trips.active[i].flags.enabled)
 755                         tz->state.active = 1;
 756
 757         /*
 758          * Calculate Sleep Time
 759          * --------------------
 760          * If we're in the passive state, use _TSP's value.  Otherwise
 761          * use the default polling frequency (e.g. _TZP).  If no polling
 762          * frequency is specified then we'll wait forever (at least until
 763          * a thermal event occurs).  Note that _TSP and _TZD values are
 764          * given in 1/10th seconds (we must covert to milliseconds).
 765          */
 766         if (tz->state.passive)
 767                 sleep_time = tz->trips.passive.tsp * 100;
 768         else if (tz->polling_frequency > 0)
 769                 sleep_time = tz->polling_frequency * 100;
 770
 771         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 772                           tz->name, tz->temperature, sleep_time));
 773
 774         /*
 775          * Schedule Next Poll
 776          * ------------------
 777          */
 778         if (!sleep_time) {
 779                 if (timer_pending(&(tz->timer)))
 780                         del_timer(&(tz->timer));
 781         } else {
 782                 if (timer_pending(&(tz->timer)))
 783                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 784                 else {
 785                         tz->timer.data = (unsigned long)tz;
 786                         tz->timer.function = acpi_thermal_run;
 787                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 788                         add_timer(&(tz->timer));
 789                 }
 790         }
 791
 792         return_VOID;
 793 }
 794
 795 /* --------------------------------------------------------------------------
 796                               FS Interface (/proc)
 797    -------------------------------------------------------------------------- */
 798
 799 static struct proc_dir_entry *acpi_thermal_dir;
 800
 801 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 802 {
 803         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 804
 805         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 806
 807         if (!tz)
 808                 goto end;
 809
 810         seq_puts(seq, "state:                   ");
 811
 812         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 813             && !tz->state.active)
 814                 seq_puts(seq, "ok\n");
 815         else {
 816                 if (tz->state.critical)
 817                         seq_puts(seq, "critical ");
 818                 if (tz->state.hot)
 819                         seq_puts(seq, "hot ");
 820                 if (tz->state.passive)
 821                         seq_puts(seq, "passive ");
 822                 if (tz->state.active)
 823                         seq_printf(seq, "active[%d]", tz->state.active_index);
 824                 seq_puts(seq, "\n");
 825         }
 826
 827       end:
 828         return_VALUE(0);
 829 }
 830
 831 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 832 {
 833         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 834 }
 835
 836 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 837 {
 838         int result = 0;
 839         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 840
 841         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 842
 843         if (!tz)
 844                 goto end;
 845
 846         result = acpi_thermal_get_temperature(tz);
 847         if (result)
 848                 goto end;
 849
 850         seq_printf(seq, "temperature:             %ld C\n",
 851                    KELVIN_TO_CELSIUS(tz->temperature));
 852
 853       end:
 854         return_VALUE(0);
 855 }
 856
 857 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 858 {
 859         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 860 }
 861
 862 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 863 {
 864         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 865         int i = 0;
 866         int j = 0;
 867
 868         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 869
 870         if (!tz)
 871                 goto end;
 872
 873         if (tz->trips.critical.flags.valid)
 874                 seq_printf(seq, "critical (S5):           %ld C\n",
 875                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 876
 877         if (tz->trips.hot.flags.valid)
 878                 seq_printf(seq, "hot (S4):                %ld C\n",
 879                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 880
 881         if (tz->trips.passive.flags.valid) {
 882                 seq_printf(seq,
 883                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 884                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 885                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 886                            tz->trips.passive.tsp);
 887                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 888
 889                         seq_printf(seq, "0x%p ",
 890                                    tz->trips.passive.devices.handles[j]);
 891                 }
 892                 seq_puts(seq, "\n");
 893         }
 894
 895         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 896                 if (!(tz->trips.active[i].flags.valid))
 897                         break;
 898                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 899                            i,
 900                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 901                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 902                         seq_printf(seq, "0x%p ",
 903                                    tz->trips.active[i].devices.handles[j]);
 904                 seq_puts(seq, "\n");
 905         }
 906
 907       end:
 908         return_VALUE(0);
 909 }
 910
 911 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 912 {
 913         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 914 }
 915
 916 static ssize_t
 917 acpi_thermal_write_trip_points(struct file *file,
 918                                const char __user * buffer,
 919                                size_t count, loff_t * ppos)
 920 {
 921         struct seq_file *m = (struct seq_file *)file->private_data;
 922         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
 923
 924         char *limit_string;
 925         int num, critical, hot, passive;
 926         int *active;
 927         int i = 0;
 928
 929         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 930
 931         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 932         if (!limit_string)
 933                 return_VALUE(-ENOMEM);
 934
 935         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 936
 937         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 938         if (!active)
 939                 return_VALUE(-ENOMEM);
 940
 941         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 942                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 943                 count = -EINVAL;
 944                 goto end;
 945         }
 946
 947         if (copy_from_user(limit_string, buffer, count)) {
 948                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 949                 count = -EFAULT;
 950                 goto end;
 951         }
 952
 953         limit_string[count] = '\0';
 954
 955         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 956                      &critical, &hot, &passive,
 957                      &active[0], &active[1], &active[2], &active[3], &active[4],
 958                      &active[5], &active[6], &active[7], &active[8],
 959                      &active[9]);
 960         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 961                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 962                 count = -EINVAL;
 963                 goto end;
 964         }
 965
 966         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 967         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 968         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 969         for (i = 0; i < num - 3; i++) {
 970                 if (!(tz->trips.active[i].flags.valid))
 971                         break;
 972                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 973         }
 974
 975       end:
 976         kfree(active);
 977         kfree(limit_string);
 978         return_VALUE(count);
 979 }
 980
 981 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 982 {
 983         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 984
 985         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 986
 987         if (!tz)
 988                 goto end;
 989
 990         if (!tz->flags.cooling_mode) {
 991                 seq_puts(seq, "<setting not supported>\n");
 992         }
 993
 994         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 995                 seq_printf(seq, "cooling mode:  critical\n");
 996         else
 997                 seq_printf(seq, "cooling mode:  %s\n",
 998                            tz->cooling_mode ? "passive" : "active");
 999
1000       end:
1001         return_VALUE(0);
1002 }
1003
1004 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1005 {
1006         return single_open(file, acpi_thermal_cooling_seq_show,
1007                            PDE(inode)->data);
1008 }
1009
1010 static ssize_t
1011 acpi_thermal_write_cooling_mode(struct file *file,
1012                                 const char __user * buffer,
1013                                 size_t count, loff_t * ppos)
1014 {
1015         struct seq_file *m = (struct seq_file *)file->private_data;
1016         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1017         int result = 0;
1018         char mode_string[12] = { '\0' };
1019
1020         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1021
1022         if (!tz || (count > sizeof(mode_string) - 1))
1023                 return_VALUE(-EINVAL);
1024
1025         if (!tz->flags.cooling_mode)
1026                 return_VALUE(-ENODEV);
1027
1028         if (copy_from_user(mode_string, buffer, count))
1029                 return_VALUE(-EFAULT);
1030
1031         mode_string[count] = '\0';
1032
1033         result = acpi_thermal_set_cooling_mode(tz,
1034                                                simple_strtoul(mode_string, NULL,
1035                                                               0));
1036         if (result)
1037                 return_VALUE(result);
1038
1039         acpi_thermal_check(tz);
1040
1041         return_VALUE(count);
1042 }
1043
1044 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1045 {
1046         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1047
1048         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1049
1050         if (!tz)
1051                 goto end;
1052
1053         if (!tz->polling_frequency) {
1054                 seq_puts(seq, "<polling disabled>\n");
1055                 goto end;
1056         }
1057
1058         seq_printf(seq, "polling frequency:       %lu seconds\n",
1059                    (tz->polling_frequency / 10));
1060
1061       end:
1062         return_VALUE(0);
1063 }
1064
1065 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1066 {
1067         return single_open(file, acpi_thermal_polling_seq_show,
1068                            PDE(inode)->data);
1069 }
1070
1071 static ssize_t
1072 acpi_thermal_write_polling(struct file *file,
1073                            const char __user * buffer,
1074                            size_t count, loff_t * ppos)
1075 {
1076         struct seq_file *m = (struct seq_file *)file->private_data;
1077         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1078         int result = 0;
1079         char polling_string[12] = { '\0' };
1080         int seconds = 0;
1081
1082         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1083
1084         if (!tz || (count > sizeof(polling_string) - 1))
1085                 return_VALUE(-EINVAL);
1086
1087         if (copy_from_user(polling_string, buffer, count))
1088                 return_VALUE(-EFAULT);
1089
1090         polling_string[count] = '\0';
1091
1092         seconds = simple_strtoul(polling_string, NULL, 0);
1093
1094         result = acpi_thermal_set_polling(tz, seconds);
1095         if (result)
1096                 return_VALUE(result);
1097
1098         acpi_thermal_check(tz);
1099
1100         return_VALUE(count);
1101 }
1102
1103 static int acpi_thermal_add_fs(struct acpi_device *device)
1104 {
1105         struct proc_dir_entry *entry = NULL;
1106
1107         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1108
1109         if (!acpi_device_dir(device)) {
1110                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1111                                                      acpi_thermal_dir);
1112                 if (!acpi_device_dir(device))
1113                         return_VALUE(-ENODEV);
1114                 acpi_device_dir(device)->owner = THIS_MODULE;
1115         }
1116
1117         /* 'state' [R] */
1118         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1119                                   S_IRUGO, acpi_device_dir(device));
1120         if (!entry)
1121                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1122                                   "Unable to create '%s' fs entry\n",
1123                                   ACPI_THERMAL_FILE_STATE));
1124         else {
1125                 entry->proc_fops = &acpi_thermal_state_fops;
1126                 entry->data = acpi_driver_data(device);
1127                 entry->owner = THIS_MODULE;
1128         }
1129
1130         /* 'temperature' [R] */
1131         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1132                                   S_IRUGO, acpi_device_dir(device));
1133         if (!entry)
1134                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1135                                   "Unable to create '%s' fs entry\n",
1136                                   ACPI_THERMAL_FILE_TEMPERATURE));
1137         else {
1138                 entry->proc_fops = &acpi_thermal_temp_fops;
1139                 entry->data = acpi_driver_data(device);
1140                 entry->owner = THIS_MODULE;
1141         }
1142
1143         /* 'trip_points' [R/W] */
1144         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1145                                   S_IFREG | S_IRUGO | S_IWUSR,
1146                                   acpi_device_dir(device));
1147         if (!entry)
1148                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1149                                   "Unable to create '%s' fs entry\n",
1150                                   ACPI_THERMAL_FILE_TRIP_POINTS));
1151         else {
1152                 entry->proc_fops = &acpi_thermal_trip_fops;
1153                 entry->data = acpi_driver_data(device);
1154                 entry->owner = THIS_MODULE;
1155         }
1156
1157         /* 'cooling_mode' [R/W] */
1158         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1159                                   S_IFREG | S_IRUGO | S_IWUSR,
1160                                   acpi_device_dir(device));
1161         if (!entry)
1162                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1163                                   "Unable to create '%s' fs entry\n",
1164                                   ACPI_THERMAL_FILE_COOLING_MODE));
1165         else {
1166                 entry->proc_fops = &acpi_thermal_cooling_fops;
1167                 entry->data = acpi_driver_data(device);
1168                 entry->owner = THIS_MODULE;
1169         }
1170
1171         /* 'polling_frequency' [R/W] */
1172         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1173                                   S_IFREG | S_IRUGO | S_IWUSR,
1174                                   acpi_device_dir(device));
1175         if (!entry)
1176                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1177                                   "Unable to create '%s' fs entry\n",
1178                                   ACPI_THERMAL_FILE_POLLING_FREQ));
1179         else {
1180                 entry->proc_fops = &acpi_thermal_polling_fops;
1181                 entry->data = acpi_driver_data(device);
1182                 entry->owner = THIS_MODULE;
1183         }
1184
1185         return_VALUE(0);
1186 }
1187
1188 static int acpi_thermal_remove_fs(struct acpi_device *device)
1189 {
1190         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1191
1192         if (acpi_device_dir(device)) {
1193                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1194                                   acpi_device_dir(device));
1195                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1196                                   acpi_device_dir(device));
1197                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1198                                   acpi_device_dir(device));
1199                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1200                                   acpi_device_dir(device));
1201                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1202                                   acpi_device_dir(device));
1203                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1204                 acpi_device_dir(device) = NULL;
1205         }
1206
1207         return_VALUE(0);
1208 }
1209
1210 /* --------------------------------------------------------------------------
1211                                  Driver Interface
1212    -------------------------------------------------------------------------- */
1213
1214 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1215 {
1216         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1217         struct acpi_device *device = NULL;
1218
1219         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1220
1221         if (!tz)
1222                 return_VOID;
1223
1224         if (acpi_bus_get_device(tz->handle, &device))
1225                 return_VOID;
1226
1227         switch (event) {
1228         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1229                 acpi_thermal_check(tz);
1230                 break;
1231         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1232                 acpi_thermal_get_trip_points(tz);
1233                 acpi_thermal_check(tz);
1234                 acpi_bus_generate_event(device, event, 0);
1235                 break;
1236         case ACPI_THERMAL_NOTIFY_DEVICES:
1237                 if (tz->flags.devices)
1238                         acpi_thermal_get_devices(tz);
1239                 acpi_bus_generate_event(device, event, 0);
1240                 break;
1241         default:
1242                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1243                                   "Unsupported event [0x%x]\n", event));
1244                 break;
1245         }
1246
1247         return_VOID;
1248 }
1249
1250 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1251 {
1252         int result = 0;
1253
1254         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1255
1256         if (!tz)
1257                 return_VALUE(-EINVAL);
1258
1259         /* Get temperature [_TMP] (required) */
1260         result = acpi_thermal_get_temperature(tz);
1261         if (result)
1262                 return_VALUE(result);
1263
1264         /* Get trip points [_CRT, _PSV, etc.] (required) */
1265         result = acpi_thermal_get_trip_points(tz);
1266         if (result)
1267                 return_VALUE(result);
1268
1269         /* Set the cooling mode [_SCP] to active cooling (default) */
1270         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1271         if (!result)
1272                 tz->flags.cooling_mode = 1;
1273         else {
1274                 /* Oh,we have not _SCP method.
1275                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1276                 tz->flags.cooling_mode = 0;
1277                 if (tz->trips.active[0].flags.valid
1278                     && tz->trips.passive.flags.valid) {
1279                         if (tz->trips.passive.temperature >
1280                             tz->trips.active[0].temperature)
1281                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1282                         else
1283                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1284                 } else if (!tz->trips.active[0].flags.valid
1285                            && tz->trips.passive.flags.valid) {
1286                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1287                 } else if (tz->trips.active[0].flags.valid
1288                            && !tz->trips.passive.flags.valid) {
1289                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1290                 } else {
1291                         /* _ACx and _PSV are optional, but _CRT is required */
1292                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1293                 }
1294         }
1295
1296         /* Get default polling frequency [_TZP] (optional) */
1297         if (tzp)
1298                 tz->polling_frequency = tzp;
1299         else
1300                 acpi_thermal_get_polling_frequency(tz);
1301
1302         /* Get devices in this thermal zone [_TZD] (optional) */
1303         result = acpi_thermal_get_devices(tz);
1304         if (!result)
1305                 tz->flags.devices = 1;
1306
1307         return_VALUE(0);
1308 }
1309
1310 static int acpi_thermal_add(struct acpi_device *device)
1311 {
1312         int result = 0;
1313         acpi_status status = AE_OK;
1314         struct acpi_thermal *tz = NULL;
1315
1316         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1317
1318         if (!device)
1319                 return_VALUE(-EINVAL);
1320
1321         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1322         if (!tz)
1323                 return_VALUE(-ENOMEM);
1324         memset(tz, 0, sizeof(struct acpi_thermal));
1325
1326         tz->handle = device->handle;
1327         strcpy(tz->name, device->pnp.bus_id);
1328         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1329         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1330         acpi_driver_data(device) = tz;
1331
1332         result = acpi_thermal_get_info(tz);
1333         if (result)
1334                 goto end;
1335
1336         result = acpi_thermal_add_fs(device);
1337         if (result)
1338                 return_VALUE(result);
1339
1340         init_timer(&tz->timer);
1341
1342         acpi_thermal_check(tz);
1343
1344         status = acpi_install_notify_handler(tz->handle,
1345                                              ACPI_DEVICE_NOTIFY,
1346                                              acpi_thermal_notify, tz);
1347         if (ACPI_FAILURE(status)) {
1348                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1349                                   "Error installing notify handler\n"));
1350                 result = -ENODEV;
1351                 goto end;
1352         }
1353
1354         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1355                acpi_device_name(device), acpi_device_bid(device),
1356                KELVIN_TO_CELSIUS(tz->temperature));
1357
1358       end:
1359         if (result) {
1360                 acpi_thermal_remove_fs(device);
1361                 kfree(tz);
1362         }
1363
1364         return_VALUE(result);
1365 }
1366
1367 static int acpi_thermal_remove(struct acpi_device *device, int type)
1368 {
1369         acpi_status status = AE_OK;
1370         struct acpi_thermal *tz = NULL;
1371
1372         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1373
1374         if (!device || !acpi_driver_data(device))
1375                 return_VALUE(-EINVAL);
1376
1377         tz = (struct acpi_thermal *)acpi_driver_data(device);
1378
1379         /* avoid timer adding new defer task */
1380         tz->zombie = 1;
1381         /* wait for running timer (on other CPUs) finish */
1382         del_timer_sync(&(tz->timer));
1383         /* synchronize deferred task */
1384         acpi_os_wait_events_complete(NULL);
1385         /* deferred task may reinsert timer */
1386         del_timer_sync(&(tz->timer));
1387
1388         status = acpi_remove_notify_handler(tz->handle,
1389                                             ACPI_DEVICE_NOTIFY,
1390                                             acpi_thermal_notify);
1391         if (ACPI_FAILURE(status))
1392                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1393                                   "Error removing notify handler\n"));
1394
1395         /* Terminate policy */
1396         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1397                 tz->trips.passive.flags.enabled = 0;
1398                 acpi_thermal_passive(tz);
1399         }
1400         if (tz->trips.active[0].flags.valid
1401             && tz->trips.active[0].flags.enabled) {
1402                 tz->trips.active[0].flags.enabled = 0;
1403                 acpi_thermal_active(tz);
1404         }
1405
1406         acpi_thermal_remove_fs(device);
1407
1408         kfree(tz);
1409         return_VALUE(0);
1410 }
1411
1412 static int __init acpi_thermal_init(void)
1413 {
1414         int result = 0;
1415
1416         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1417
1418         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1419         if (!acpi_thermal_dir)
1420                 return_VALUE(-ENODEV);
1421         acpi_thermal_dir->owner = THIS_MODULE;
1422
1423         result = acpi_bus_register_driver(&acpi_thermal_driver);
1424         if (result < 0) {
1425                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1426                 return_VALUE(-ENODEV);
1427         }
1428
1429         return_VALUE(0);
1430 }
1431
1432 static void __exit 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 module_init(acpi_thermal_init);
1444 module_exit(acpi_thermal_exit);