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_resume(struct acpi_device *device, int state);
  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 *,
  90                                               const char __user *, size_t,
  91                                               loff_t *);
  92 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  93 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  94                                                const char __user *, size_t,
  95                                                loff_t *);
  96 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  97 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  98                                           size_t, loff_t *);
  99
 100 static struct acpi_driver acpi_thermal_driver = {
 101         .name = ACPI_THERMAL_DRIVER_NAME,
 102         .class = ACPI_THERMAL_CLASS,
 103         .ids = ACPI_THERMAL_HID,
 104         .ops = {
 105                 .add = acpi_thermal_add,
 106                 .remove = acpi_thermal_remove,
 107                 .resume = acpi_thermal_resume,
 108                 },
 109 };
 110
 111 struct acpi_thermal_state {
 112         u8 critical:1;
 113         u8 hot:1;
 114         u8 passive:1;
 115         u8 active:1;
 116         u8 reserved:4;
 117         int active_index;
 118 };
 119
 120 struct acpi_thermal_state_flags {
 121         u8 valid:1;
 122         u8 enabled:1;
 123         u8 reserved:6;
 124 };
 125
 126 struct acpi_thermal_critical {
 127         struct acpi_thermal_state_flags flags;
 128         unsigned long temperature;
 129 };
 130
 131 struct acpi_thermal_hot {
 132         struct acpi_thermal_state_flags flags;
 133         unsigned long temperature;
 134 };
 135
 136 struct acpi_thermal_passive {
 137         struct acpi_thermal_state_flags flags;
 138         unsigned long temperature;
 139         unsigned long tc1;
 140         unsigned long tc2;
 141         unsigned long tsp;
 142         struct acpi_handle_list devices;
 143 };
 144
 145 struct acpi_thermal_active {
 146         struct acpi_thermal_state_flags flags;
 147         unsigned long temperature;
 148         struct acpi_handle_list devices;
 149 };
 150
 151 struct acpi_thermal_trips {
 152         struct acpi_thermal_critical critical;
 153         struct acpi_thermal_hot hot;
 154         struct acpi_thermal_passive passive;
 155         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 156 };
 157
 158 struct acpi_thermal_flags {
 159         u8 cooling_mode:1;      /* _SCP */
 160         u8 devices:1;           /* _TZD */
 161         u8 reserved:6;
 162 };
 163
 164 struct acpi_thermal {
 165         acpi_handle handle;
 166         acpi_bus_id name;
 167         unsigned long temperature;
 168         unsigned long last_temperature;
 169         unsigned long polling_frequency;
 170         u8 cooling_mode;
 171         volatile u8 zombie;
 172         struct acpi_thermal_flags flags;
 173         struct acpi_thermal_state state;
 174         struct acpi_thermal_trips trips;
 175         struct acpi_handle_list devices;
 176         struct timer_list timer;
 177 };
 178
 179 static struct file_operations acpi_thermal_state_fops = {
 180         .open = acpi_thermal_state_open_fs,
 181         .read = seq_read,
 182         .llseek = seq_lseek,
 183         .release = single_release,
 184 };
 185
 186 static struct file_operations acpi_thermal_temp_fops = {
 187         .open = acpi_thermal_temp_open_fs,
 188         .read = seq_read,
 189         .llseek = seq_lseek,
 190         .release = single_release,
 191 };
 192
 193 static struct file_operations acpi_thermal_trip_fops = {
 194         .open = acpi_thermal_trip_open_fs,
 195         .read = seq_read,
 196         .write = acpi_thermal_write_trip_points,
 197         .llseek = seq_lseek,
 198         .release = single_release,
 199 };
 200
 201 static struct file_operations acpi_thermal_cooling_fops = {
 202         .open = acpi_thermal_cooling_open_fs,
 203         .read = seq_read,
 204         .write = acpi_thermal_write_cooling_mode,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static struct file_operations acpi_thermal_polling_fops = {
 210         .open = acpi_thermal_polling_open_fs,
 211         .read = seq_read,
 212         .write = acpi_thermal_write_polling,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 /* --------------------------------------------------------------------------
 218                              Thermal Zone Management
 219    -------------------------------------------------------------------------- */
 220
 221 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 222 {
 223         acpi_status status = AE_OK;
 224
 225         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 226
 227         if (!tz)
 228                 return_VALUE(-EINVAL);
 229
 230         tz->last_temperature = tz->temperature;
 231
 232         status =
 233             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 234         if (ACPI_FAILURE(status))
 235                 return_VALUE(-ENODEV);
 236
 237         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 238                           tz->temperature));
 239
 240         return_VALUE(0);
 241 }
 242
 243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 244 {
 245         acpi_status status = AE_OK;
 246
 247         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 248
 249         if (!tz)
 250                 return_VALUE(-EINVAL);
 251
 252         status =
 253             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
 254                                   &tz->polling_frequency);
 255         if (ACPI_FAILURE(status))
 256                 return_VALUE(-ENODEV);
 257
 258         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 259                           tz->polling_frequency));
 260
 261         return_VALUE(0);
 262 }
 263
 264 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 265 {
 266         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 267
 268         if (!tz)
 269                 return_VALUE(-EINVAL);
 270
 271         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 272
 273         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 274                           "Polling frequency set to %lu seconds\n",
 275                           tz->polling_frequency));
 276
 277         return_VALUE(0);
 278 }
 279
 280 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, 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 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 313 {
 314         acpi_status status = AE_OK;
 315         int i = 0;
 316
 317         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 318
 319         if (!tz)
 320                 return_VALUE(-EINVAL);
 321
 322         /* Critical Shutdown (required) */
 323
 324         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 325                                        &tz->trips.critical.temperature);
 326         if (ACPI_FAILURE(status)) {
 327                 tz->trips.critical.flags.valid = 0;
 328                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 329                 return_VALUE(-ENODEV);
 330         } else {
 331                 tz->trips.critical.flags.valid = 1;
 332                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 333                                   "Found critical threshold [%lu]\n",
 334                                   tz->trips.critical.temperature));
 335         }
 336
 337         /* Critical Sleep (optional) */
 338
 339         status =
 340             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
 341                                   &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         } else {
 346                 tz->trips.hot.flags.valid = 1;
 347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 348                                   tz->trips.hot.temperature));
 349         }
 350
 351         /* Passive: Processors (optional) */
 352
 353         status =
 354             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
 355                                   &tz->trips.passive.temperature);
 356         if (ACPI_FAILURE(status)) {
 357                 tz->trips.passive.flags.valid = 0;
 358                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 359         } else {
 360                 tz->trips.passive.flags.valid = 1;
 361
 362                 status =
 363                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
 364                                           &tz->trips.passive.tc1);
 365                 if (ACPI_FAILURE(status))
 366                         tz->trips.passive.flags.valid = 0;
 367
 368                 status =
 369                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
 370                                           &tz->trips.passive.tc2);
 371                 if (ACPI_FAILURE(status))
 372                         tz->trips.passive.flags.valid = 0;
 373
 374                 status =
 375                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
 376                                           &tz->trips.passive.tsp);
 377                 if (ACPI_FAILURE(status))
 378                         tz->trips.passive.flags.valid = 0;
 379
 380                 status =
 381                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
 382                                             &tz->trips.passive.devices);
 383                 if (ACPI_FAILURE(status))
 384                         tz->trips.passive.flags.valid = 0;
 385
 386                 if (!tz->trips.passive.flags.valid)
 387                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 388                                           "Invalid passive threshold\n"));
 389                 else
 390                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 391                                           "Found passive threshold [%lu]\n",
 392                                           tz->trips.passive.temperature));
 393         }
 394
 395         /* Active: Fans, etc. (optional) */
 396
 397         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 398
 399                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 400
 401                 status =
 402                     acpi_evaluate_integer(tz->handle, name, NULL,
 403                                           &tz->trips.active[i].temperature);
 404                 if (ACPI_FAILURE(status))
 405                         break;
 406
 407                 name[2] = 'L';
 408                 status =
 409                     acpi_evaluate_reference(tz->handle, name, NULL,
 410                                             &tz->trips.active[i].devices);
 411                 if (ACPI_SUCCESS(status)) {
 412                         tz->trips.active[i].flags.valid = 1;
 413                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 414                                           "Found active threshold [%d]:[%lu]\n",
 415                                           i, tz->trips.active[i].temperature));
 416                 } else
 417                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 418                                           "Invalid active threshold [%d]\n",
 419                                           i));
 420         }
 421
 422         return_VALUE(0);
 423 }
 424
 425 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 426 {
 427         acpi_status status = AE_OK;
 428
 429         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 430
 431         if (!tz)
 432                 return_VALUE(-EINVAL);
 433
 434         status =
 435             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 436         if (ACPI_FAILURE(status))
 437                 return_VALUE(-ENODEV);
 438
 439         return_VALUE(0);
 440 }
 441
 442 static int acpi_thermal_call_usermode(char *path)
 443 {
 444         char *argv[2] = { NULL, NULL };
 445         char *envp[3] = { NULL, NULL, NULL };
 446
 447         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 448
 449         if (!path)
 450                 return_VALUE(-EINVAL);
 451
 452         argv[0] = path;
 453
 454         /* minimal command environment */
 455         envp[0] = "HOME=/";
 456         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 457
 458         call_usermodehelper(argv[0], argv, envp, 0);
 459
 460         return_VALUE(0);
 461 }
 462
 463 static int acpi_thermal_critical(struct acpi_thermal *tz)
 464 {
 465         int result = 0;
 466         struct acpi_device *device = NULL;
 467
 468         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 469
 470         if (!tz || !tz->trips.critical.flags.valid)
 471                 return_VALUE(-EINVAL);
 472
 473         if (tz->temperature >= tz->trips.critical.temperature) {
 474                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 475                 tz->trips.critical.flags.enabled = 1;
 476         } else if (tz->trips.critical.flags.enabled)
 477                 tz->trips.critical.flags.enabled = 0;
 478
 479         result = acpi_bus_get_device(tz->handle, &device);
 480         if (result)
 481                 return_VALUE(result);
 482
 483         printk(KERN_EMERG
 484                "Critical temperature reached (%ld C), shutting down.\n",
 485                KELVIN_TO_CELSIUS(tz->temperature));
 486         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
 487                                 tz->trips.critical.flags.enabled);
 488
 489         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 490
 491         return_VALUE(0);
 492 }
 493
 494 static int acpi_thermal_hot(struct acpi_thermal *tz)
 495 {
 496         int result = 0;
 497         struct acpi_device *device = NULL;
 498
 499         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 500
 501         if (!tz || !tz->trips.hot.flags.valid)
 502                 return_VALUE(-EINVAL);
 503
 504         if (tz->temperature >= tz->trips.hot.temperature) {
 505                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 506                 tz->trips.hot.flags.enabled = 1;
 507         } else if (tz->trips.hot.flags.enabled)
 508                 tz->trips.hot.flags.enabled = 0;
 509
 510         result = acpi_bus_get_device(tz->handle, &device);
 511         if (result)
 512                 return_VALUE(result);
 513
 514         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
 515                                 tz->trips.hot.flags.enabled);
 516
 517         /* TBD: Call user-mode "sleep(S4)" function */
 518
 519         return_VALUE(0);
 520 }
 521
 522 static void acpi_thermal_passive(struct acpi_thermal *tz)
 523 {
 524         int result = 1;
 525         struct acpi_thermal_passive *passive = NULL;
 526         int trend = 0;
 527         int i = 0;
 528
 529         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 530
 531         if (!tz || !tz->trips.passive.flags.valid)
 532                 return;
 533
 534         passive = &(tz->trips.passive);
 535
 536         /*
 537          * Above Trip?
 538          * -----------
 539          * Calculate the thermal trend (using the passive cooling equation)
 540          * and modify the performance limit for all passive cooling devices
 541          * accordingly.  Note that we assume symmetry.
 542          */
 543         if (tz->temperature >= passive->temperature) {
 544                 trend =
 545                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 546                     (passive->tc2 * (tz->temperature - passive->temperature));
 547                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 548                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 549                                   trend, passive->tc1, tz->temperature,
 550                                   tz->last_temperature, passive->tc2,
 551                                   tz->temperature, passive->temperature));
 552                 passive->flags.enabled = 1;
 553                 /* Heating up? */
 554                 if (trend > 0)
 555                         for (i = 0; i < passive->devices.count; i++)
 556                                 acpi_processor_set_thermal_limit(passive->
 557                                                                  devices.
 558                                                                  handles[i],
 559                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 560                 /* Cooling off? */
 561                 else if (trend < 0) {
 562                         for (i = 0; i < passive->devices.count; i++)
 563                                 /*
 564                                  * assume that we are on highest
 565                                  * freq/lowest thrott and can leave
 566                                  * passive mode, even in error case
 567                                  */
 568                                 if (!acpi_processor_set_thermal_limit
 569                                     (passive->devices.handles[i],
 570                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 571                                         result = 0;
 572                         /*
 573                          * Leave cooling mode, even if the temp might
 574                          * higher than trip point This is because some
 575                          * machines might have long thermal polling
 576                          * frequencies (tsp) defined. We will fall back
 577                          * into passive mode in next cycle (probably quicker)
 578                          */
 579                         if (result) {
 580                                 passive->flags.enabled = 0;
 581                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 582                                                   "Disabling passive cooling, still above threshold,"
 583                                                   " but we are cooling down\n"));
 584                         }
 585                 }
 586                 return;
 587         }
 588
 589         /*
 590          * Below Trip?
 591          * -----------
 592          * Implement passive cooling hysteresis to slowly increase performance
 593          * and avoid thrashing around the passive trip point.  Note that we
 594          * assume symmetry.
 595          */
 596         if (!passive->flags.enabled)
 597                 return;
 598         for (i = 0; i < passive->devices.count; i++)
 599                 if (!acpi_processor_set_thermal_limit
 600                     (passive->devices.handles[i],
 601                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 602                         result = 0;
 603         if (result) {
 604                 passive->flags.enabled = 0;
 605                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 606                                   "Disabling passive cooling (zone is cool)\n"));
 607         }
 608 }
 609
 610 static void acpi_thermal_active(struct acpi_thermal *tz)
 611 {
 612         int result = 0;
 613         struct acpi_thermal_active *active = NULL;
 614         int i = 0;
 615         int j = 0;
 616         unsigned long maxtemp = 0;
 617
 618         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 619
 620         if (!tz)
 621                 return;
 622
 623         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 624                 active = &(tz->trips.active[i]);
 625                 if (!active || !active->flags.valid)
 626                         break;
 627                 if (tz->temperature >= active->temperature) {
 628                         /*
 629                          * Above Threshold?
 630                          * ----------------
 631                          * If not already enabled, turn ON all cooling devices
 632                          * associated with this active threshold.
 633                          */
 634                         if (active->temperature > maxtemp)
 635                                 tz->state.active_index = i;
 636                         maxtemp = active->temperature;
 637                         if (active->flags.enabled)
 638                                 continue;
 639                         for (j = 0; j < active->devices.count; j++) {
 640                                 result =
 641                                     acpi_bus_set_power(active->devices.
 642                                                        handles[j],
 643                                                        ACPI_STATE_D0);
 644                                 if (result) {
 645                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 646                                                           "Unable to turn cooling device [%p] 'on'\n",
 647                                                           active->devices.
 648                                                           handles[j]));
 649                                         continue;
 650                                 }
 651                                 active->flags.enabled = 1;
 652                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 653                                                   "Cooling device [%p] now 'on'\n",
 654                                                   active->devices.handles[j]));
 655                         }
 656                         continue;
 657                 }
 658                 if (!active->flags.enabled)
 659                         continue;
 660                 /*
 661                  * Below Threshold?
 662                  * ----------------
 663                  * Turn OFF all cooling devices associated with this
 664                  * threshold.
 665                  */
 666                 for (j = 0; j < active->devices.count; j++) {
 667                         result = acpi_bus_set_power(active->devices.handles[j],
 668                                                     ACPI_STATE_D3);
 669                         if (result) {
 670                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 671                                                   "Unable to turn cooling device [%p] 'off'\n",
 672                                                   active->devices.handles[j]));
 673                                 continue;
 674                         }
 675                         active->flags.enabled = 0;
 676                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 677                                           "Cooling device [%p] now 'off'\n",
 678                                           active->devices.handles[j]));
 679                 }
 680         }
 681 }
 682
 683 static void acpi_thermal_check(void *context);
 684
 685 static void acpi_thermal_run(unsigned long data)
 686 {
 687         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 688         if (!tz->zombie)
 689                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 690 }
 691
 692 static void acpi_thermal_check(void *data)
 693 {
 694         int result = 0;
 695         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 696         unsigned long sleep_time = 0;
 697         int i = 0;
 698         struct acpi_thermal_state state;
 699
 700         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 701
 702         if (!tz) {
 703                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 704                 return_VOID;
 705         }
 706
 707         state = tz->state;
 708
 709         result = acpi_thermal_get_temperature(tz);
 710         if (result)
 711                 return_VOID;
 712
 713         memset(&tz->state, 0, sizeof(tz->state));
 714
 715         /*
 716          * Check Trip Points
 717          * -----------------
 718          * Compare the current temperature to the trip point values to see
 719          * if we've entered one of the thermal policy states.  Note that
 720          * this function determines when a state is entered, but the
 721          * individual policy decides when it is exited (e.g. hysteresis).
 722          */
 723         if (tz->trips.critical.flags.valid)
 724                 state.critical |=
 725                     (tz->temperature >= tz->trips.critical.temperature);
 726         if (tz->trips.hot.flags.valid)
 727                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 728         if (tz->trips.passive.flags.valid)
 729                 state.passive |=
 730                     (tz->temperature >= tz->trips.passive.temperature);
 731         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 732                 if (tz->trips.active[i].flags.valid)
 733                         state.active |=
 734                             (tz->temperature >=
 735                              tz->trips.active[i].temperature);
 736
 737         /*
 738          * Invoke Policy
 739          * -------------
 740          * Separated from the above check to allow individual policy to
 741          * determine when to exit a given state.
 742          */
 743         if (state.critical)
 744                 acpi_thermal_critical(tz);
 745         if (state.hot)
 746                 acpi_thermal_hot(tz);
 747         if (state.passive)
 748                 acpi_thermal_passive(tz);
 749         if (state.active)
 750                 acpi_thermal_active(tz);
 751
 752         /*
 753          * Calculate State
 754          * ---------------
 755          * Again, separated from the above two to allow independent policy
 756          * decisions.
 757          */
 758         tz->state.critical = tz->trips.critical.flags.enabled;
 759         tz->state.hot = tz->trips.hot.flags.enabled;
 760         tz->state.passive = tz->trips.passive.flags.enabled;
 761         tz->state.active = 0;
 762         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 763                 tz->state.active |= tz->trips.active[i].flags.enabled;
 764
 765         /*
 766          * Calculate Sleep Time
 767          * --------------------
 768          * If we're in the passive state, use _TSP's value.  Otherwise
 769          * use the default polling frequency (e.g. _TZP).  If no polling
 770          * frequency is specified then we'll wait forever (at least until
 771          * a thermal event occurs).  Note that _TSP and _TZD values are
 772          * given in 1/10th seconds (we must covert to milliseconds).
 773          */
 774         if (tz->state.passive)
 775                 sleep_time = tz->trips.passive.tsp * 100;
 776         else if (tz->polling_frequency > 0)
 777                 sleep_time = tz->polling_frequency * 100;
 778
 779         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 780                           tz->name, tz->temperature, sleep_time));
 781
 782         /*
 783          * Schedule Next Poll
 784          * ------------------
 785          */
 786         if (!sleep_time) {
 787                 if (timer_pending(&(tz->timer)))
 788                         del_timer(&(tz->timer));
 789         } else {
 790                 if (timer_pending(&(tz->timer)))
 791                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 792                 else {
 793                         tz->timer.data = (unsigned long)tz;
 794                         tz->timer.function = acpi_thermal_run;
 795                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 796                         add_timer(&(tz->timer));
 797                 }
 798         }
 799
 800         return_VOID;
 801 }
 802
 803 /* --------------------------------------------------------------------------
 804                               FS Interface (/proc)
 805    -------------------------------------------------------------------------- */
 806
 807 static struct proc_dir_entry *acpi_thermal_dir;
 808
 809 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 810 {
 811         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 812
 813         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 814
 815         if (!tz)
 816                 goto end;
 817
 818         seq_puts(seq, "state:                   ");
 819
 820         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 821             && !tz->state.active)
 822                 seq_puts(seq, "ok\n");
 823         else {
 824                 if (tz->state.critical)
 825                         seq_puts(seq, "critical ");
 826                 if (tz->state.hot)
 827                         seq_puts(seq, "hot ");
 828                 if (tz->state.passive)
 829                         seq_puts(seq, "passive ");
 830                 if (tz->state.active)
 831                         seq_printf(seq, "active[%d]", tz->state.active_index);
 832                 seq_puts(seq, "\n");
 833         }
 834
 835       end:
 836         return_VALUE(0);
 837 }
 838
 839 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 840 {
 841         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 842 }
 843
 844 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 845 {
 846         int result = 0;
 847         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 848
 849         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 850
 851         if (!tz)
 852                 goto end;
 853
 854         result = acpi_thermal_get_temperature(tz);
 855         if (result)
 856                 goto end;
 857
 858         seq_printf(seq, "temperature:             %ld C\n",
 859                    KELVIN_TO_CELSIUS(tz->temperature));
 860
 861       end:
 862         return_VALUE(0);
 863 }
 864
 865 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 866 {
 867         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 868 }
 869
 870 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 871 {
 872         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 873         int i = 0;
 874         int j = 0;
 875
 876         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 877
 878         if (!tz)
 879                 goto end;
 880
 881         if (tz->trips.critical.flags.valid)
 882                 seq_printf(seq, "critical (S5):           %ld C\n",
 883                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 884
 885         if (tz->trips.hot.flags.valid)
 886                 seq_printf(seq, "hot (S4):                %ld C\n",
 887                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 888
 889         if (tz->trips.passive.flags.valid) {
 890                 seq_printf(seq,
 891                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 892                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 893                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 894                            tz->trips.passive.tsp);
 895                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 896
 897                         seq_printf(seq, "0x%p ",
 898                                    tz->trips.passive.devices.handles[j]);
 899                 }
 900                 seq_puts(seq, "\n");
 901         }
 902
 903         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 904                 if (!(tz->trips.active[i].flags.valid))
 905                         break;
 906                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 907                            i,
 908                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 909                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 910                         seq_printf(seq, "0x%p ",
 911                                    tz->trips.active[i].devices.handles[j]);
 912                 seq_puts(seq, "\n");
 913         }
 914
 915       end:
 916         return_VALUE(0);
 917 }
 918
 919 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 920 {
 921         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 922 }
 923
 924 static ssize_t
 925 acpi_thermal_write_trip_points(struct file *file,
 926                                const char __user * buffer,
 927                                size_t count, loff_t * ppos)
 928 {
 929         struct seq_file *m = (struct seq_file *)file->private_data;
 930         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
 931
 932         char *limit_string;
 933         int num, critical, hot, passive;
 934         int *active;
 935         int i = 0;
 936
 937         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 938
 939         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 940         if (!limit_string)
 941                 return_VALUE(-ENOMEM);
 942
 943         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 944
 945         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 946         if (!active) {
 947                 kfree(limit_string);
 948                 return_VALUE(-ENOMEM);
 949         }
 950
 951         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 952                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 953                 count = -EINVAL;
 954                 goto end;
 955         }
 956
 957         if (copy_from_user(limit_string, buffer, count)) {
 958                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 959                 count = -EFAULT;
 960                 goto end;
 961         }
 962
 963         limit_string[count] = '\0';
 964
 965         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 966                      &critical, &hot, &passive,
 967                      &active[0], &active[1], &active[2], &active[3], &active[4],
 968                      &active[5], &active[6], &active[7], &active[8],
 969                      &active[9]);
 970         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 971                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 972                 count = -EINVAL;
 973                 goto end;
 974         }
 975
 976         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 977         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 978         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 979         for (i = 0; i < num - 3; i++) {
 980                 if (!(tz->trips.active[i].flags.valid))
 981                         break;
 982                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 983         }
 984
 985       end:
 986         kfree(active);
 987         kfree(limit_string);
 988         return_VALUE(count);
 989 }
 990
 991 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 992 {
 993         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 994
 995         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 996
 997         if (!tz)
 998                 goto end;
 999
1000         if (!tz->flags.cooling_mode) {
1001                 seq_puts(seq, "<setting not supported>\n");
1002         }
1003
1004         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1005                 seq_printf(seq, "cooling mode:  critical\n");
1006         else
1007                 seq_printf(seq, "cooling mode:  %s\n",
1008                            tz->cooling_mode ? "passive" : "active");
1009
1010       end:
1011         return_VALUE(0);
1012 }
1013
1014 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1015 {
1016         return single_open(file, acpi_thermal_cooling_seq_show,
1017                            PDE(inode)->data);
1018 }
1019
1020 static ssize_t
1021 acpi_thermal_write_cooling_mode(struct file *file,
1022                                 const char __user * buffer,
1023                                 size_t count, loff_t * ppos)
1024 {
1025         struct seq_file *m = (struct seq_file *)file->private_data;
1026         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1027         int result = 0;
1028         char mode_string[12] = { '\0' };
1029
1030         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1031
1032         if (!tz || (count > sizeof(mode_string) - 1))
1033                 return_VALUE(-EINVAL);
1034
1035         if (!tz->flags.cooling_mode)
1036                 return_VALUE(-ENODEV);
1037
1038         if (copy_from_user(mode_string, buffer, count))
1039                 return_VALUE(-EFAULT);
1040
1041         mode_string[count] = '\0';
1042
1043         result = acpi_thermal_set_cooling_mode(tz,
1044                                                simple_strtoul(mode_string, NULL,
1045                                                               0));
1046         if (result)
1047                 return_VALUE(result);
1048
1049         acpi_thermal_check(tz);
1050
1051         return_VALUE(count);
1052 }
1053
1054 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1055 {
1056         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1057
1058         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1059
1060         if (!tz)
1061                 goto end;
1062
1063         if (!tz->polling_frequency) {
1064                 seq_puts(seq, "<polling disabled>\n");
1065                 goto end;
1066         }
1067
1068         seq_printf(seq, "polling frequency:       %lu seconds\n",
1069                    (tz->polling_frequency / 10));
1070
1071       end:
1072         return_VALUE(0);
1073 }
1074
1075 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1076 {
1077         return single_open(file, acpi_thermal_polling_seq_show,
1078                            PDE(inode)->data);
1079 }
1080
1081 static ssize_t
1082 acpi_thermal_write_polling(struct file *file,
1083                            const char __user * buffer,
1084                            size_t count, loff_t * ppos)
1085 {
1086         struct seq_file *m = (struct seq_file *)file->private_data;
1087         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1088         int result = 0;
1089         char polling_string[12] = { '\0' };
1090         int seconds = 0;
1091
1092         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1093
1094         if (!tz || (count > sizeof(polling_string) - 1))
1095                 return_VALUE(-EINVAL);
1096
1097         if (copy_from_user(polling_string, buffer, count))
1098                 return_VALUE(-EFAULT);
1099
1100         polling_string[count] = '\0';
1101
1102         seconds = simple_strtoul(polling_string, NULL, 0);
1103
1104         result = acpi_thermal_set_polling(tz, seconds);
1105         if (result)
1106                 return_VALUE(result);
1107
1108         acpi_thermal_check(tz);
1109
1110         return_VALUE(count);
1111 }
1112
1113 static int acpi_thermal_add_fs(struct acpi_device *device)
1114 {
1115         struct proc_dir_entry *entry = NULL;
1116
1117         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1118
1119         if (!acpi_device_dir(device)) {
1120                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1121                                                      acpi_thermal_dir);
1122                 if (!acpi_device_dir(device))
1123                         return_VALUE(-ENODEV);
1124                 acpi_device_dir(device)->owner = THIS_MODULE;
1125         }
1126
1127         /* 'state' [R] */
1128         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1129                                   S_IRUGO, acpi_device_dir(device));
1130         if (!entry)
1131                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1132                                   "Unable to create '%s' fs entry\n",
1133                                   ACPI_THERMAL_FILE_STATE));
1134         else {
1135                 entry->proc_fops = &acpi_thermal_state_fops;
1136                 entry->data = acpi_driver_data(device);
1137                 entry->owner = THIS_MODULE;
1138         }
1139
1140         /* 'temperature' [R] */
1141         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1142                                   S_IRUGO, acpi_device_dir(device));
1143         if (!entry)
1144                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1145                                   "Unable to create '%s' fs entry\n",
1146                                   ACPI_THERMAL_FILE_TEMPERATURE));
1147         else {
1148                 entry->proc_fops = &acpi_thermal_temp_fops;
1149                 entry->data = acpi_driver_data(device);
1150                 entry->owner = THIS_MODULE;
1151         }
1152
1153         /* 'trip_points' [R/W] */
1154         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1155                                   S_IFREG | S_IRUGO | S_IWUSR,
1156                                   acpi_device_dir(device));
1157         if (!entry)
1158                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1159                                   "Unable to create '%s' fs entry\n",
1160                                   ACPI_THERMAL_FILE_TRIP_POINTS));
1161         else {
1162                 entry->proc_fops = &acpi_thermal_trip_fops;
1163                 entry->data = acpi_driver_data(device);
1164                 entry->owner = THIS_MODULE;
1165         }
1166
1167         /* 'cooling_mode' [R/W] */
1168         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1169                                   S_IFREG | S_IRUGO | S_IWUSR,
1170                                   acpi_device_dir(device));
1171         if (!entry)
1172                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1173                                   "Unable to create '%s' fs entry\n",
1174                                   ACPI_THERMAL_FILE_COOLING_MODE));
1175         else {
1176                 entry->proc_fops = &acpi_thermal_cooling_fops;
1177                 entry->data = acpi_driver_data(device);
1178                 entry->owner = THIS_MODULE;
1179         }
1180
1181         /* 'polling_frequency' [R/W] */
1182         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1183                                   S_IFREG | S_IRUGO | S_IWUSR,
1184                                   acpi_device_dir(device));
1185         if (!entry)
1186                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1187                                   "Unable to create '%s' fs entry\n",
1188                                   ACPI_THERMAL_FILE_POLLING_FREQ));
1189         else {
1190                 entry->proc_fops = &acpi_thermal_polling_fops;
1191                 entry->data = acpi_driver_data(device);
1192                 entry->owner = THIS_MODULE;
1193         }
1194
1195         return_VALUE(0);
1196 }
1197
1198 static int acpi_thermal_remove_fs(struct acpi_device *device)
1199 {
1200         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1201
1202         if (acpi_device_dir(device)) {
1203                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1204                                   acpi_device_dir(device));
1205                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1206                                   acpi_device_dir(device));
1207                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1208                                   acpi_device_dir(device));
1209                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1210                                   acpi_device_dir(device));
1211                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1212                                   acpi_device_dir(device));
1213                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1214                 acpi_device_dir(device) = NULL;
1215         }
1216
1217         return_VALUE(0);
1218 }
1219
1220 /* --------------------------------------------------------------------------
1221                                  Driver Interface
1222    -------------------------------------------------------------------------- */
1223
1224 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1225 {
1226         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1227         struct acpi_device *device = NULL;
1228
1229         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1230
1231         if (!tz)
1232                 return_VOID;
1233
1234         if (acpi_bus_get_device(tz->handle, &device))
1235                 return_VOID;
1236
1237         switch (event) {
1238         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1239                 acpi_thermal_check(tz);
1240                 break;
1241         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1242                 acpi_thermal_get_trip_points(tz);
1243                 acpi_thermal_check(tz);
1244                 acpi_bus_generate_event(device, event, 0);
1245                 break;
1246         case ACPI_THERMAL_NOTIFY_DEVICES:
1247                 if (tz->flags.devices)
1248                         acpi_thermal_get_devices(tz);
1249                 acpi_bus_generate_event(device, event, 0);
1250                 break;
1251         default:
1252                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1253                                   "Unsupported event [0x%x]\n", event));
1254                 break;
1255         }
1256
1257         return_VOID;
1258 }
1259
1260 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1261 {
1262         int result = 0;
1263
1264         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1265
1266         if (!tz)
1267                 return_VALUE(-EINVAL);
1268
1269         /* Get temperature [_TMP] (required) */
1270         result = acpi_thermal_get_temperature(tz);
1271         if (result)
1272                 return_VALUE(result);
1273
1274         /* Get trip points [_CRT, _PSV, etc.] (required) */
1275         result = acpi_thermal_get_trip_points(tz);
1276         if (result)
1277                 return_VALUE(result);
1278
1279         /* Set the cooling mode [_SCP] to active cooling (default) */
1280         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1281         if (!result)
1282                 tz->flags.cooling_mode = 1;
1283         else {
1284                 /* Oh,we have not _SCP method.
1285                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1286                 tz->flags.cooling_mode = 0;
1287                 if (tz->trips.active[0].flags.valid
1288                     && tz->trips.passive.flags.valid) {
1289                         if (tz->trips.passive.temperature >
1290                             tz->trips.active[0].temperature)
1291                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1292                         else
1293                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1294                 } else if (!tz->trips.active[0].flags.valid
1295                            && tz->trips.passive.flags.valid) {
1296                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1297                 } else if (tz->trips.active[0].flags.valid
1298                            && !tz->trips.passive.flags.valid) {
1299                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1300                 } else {
1301                         /* _ACx and _PSV are optional, but _CRT is required */
1302                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1303                 }
1304         }
1305
1306         /* Get default polling frequency [_TZP] (optional) */
1307         if (tzp)
1308                 tz->polling_frequency = tzp;
1309         else
1310                 acpi_thermal_get_polling_frequency(tz);
1311
1312         /* Get devices in this thermal zone [_TZD] (optional) */
1313         result = acpi_thermal_get_devices(tz);
1314         if (!result)
1315                 tz->flags.devices = 1;
1316
1317         return_VALUE(0);
1318 }
1319
1320 static int acpi_thermal_add(struct acpi_device *device)
1321 {
1322         int result = 0;
1323         acpi_status status = AE_OK;
1324         struct acpi_thermal *tz = NULL;
1325
1326         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1327
1328         if (!device)
1329                 return_VALUE(-EINVAL);
1330
1331         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1332         if (!tz)
1333                 return_VALUE(-ENOMEM);
1334         memset(tz, 0, sizeof(struct acpi_thermal));
1335
1336         tz->handle = device->handle;
1337         strcpy(tz->name, device->pnp.bus_id);
1338         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1339         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1340         acpi_driver_data(device) = tz;
1341
1342         result = acpi_thermal_get_info(tz);
1343         if (result)
1344                 goto end;
1345
1346         result = acpi_thermal_add_fs(device);
1347         if (result)
1348                 goto end;
1349
1350         init_timer(&tz->timer);
1351
1352         acpi_thermal_check(tz);
1353
1354         status = acpi_install_notify_handler(tz->handle,
1355                                              ACPI_DEVICE_NOTIFY,
1356                                              acpi_thermal_notify, tz);
1357         if (ACPI_FAILURE(status)) {
1358                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1359                                   "Error installing notify handler\n"));
1360                 result = -ENODEV;
1361                 goto end;
1362         }
1363
1364         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1365                acpi_device_name(device), acpi_device_bid(device),
1366                KELVIN_TO_CELSIUS(tz->temperature));
1367
1368       end:
1369         if (result) {
1370                 acpi_thermal_remove_fs(device);
1371                 kfree(tz);
1372         }
1373
1374         return_VALUE(result);
1375 }
1376
1377 static int acpi_thermal_remove(struct acpi_device *device, int type)
1378 {
1379         acpi_status status = AE_OK;
1380         struct acpi_thermal *tz = NULL;
1381
1382         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1383
1384         if (!device || !acpi_driver_data(device))
1385                 return_VALUE(-EINVAL);
1386
1387         tz = (struct acpi_thermal *)acpi_driver_data(device);
1388
1389         /* avoid timer adding new defer task */
1390         tz->zombie = 1;
1391         /* wait for running timer (on other CPUs) finish */
1392         del_timer_sync(&(tz->timer));
1393         /* synchronize deferred task */
1394         acpi_os_wait_events_complete(NULL);
1395         /* deferred task may reinsert timer */
1396         del_timer_sync(&(tz->timer));
1397
1398         status = acpi_remove_notify_handler(tz->handle,
1399                                             ACPI_DEVICE_NOTIFY,
1400                                             acpi_thermal_notify);
1401         if (ACPI_FAILURE(status))
1402                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1403                                   "Error removing notify handler\n"));
1404
1405         /* Terminate policy */
1406         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1407                 tz->trips.passive.flags.enabled = 0;
1408                 acpi_thermal_passive(tz);
1409         }
1410         if (tz->trips.active[0].flags.valid
1411             && tz->trips.active[0].flags.enabled) {
1412                 tz->trips.active[0].flags.enabled = 0;
1413                 acpi_thermal_active(tz);
1414         }
1415
1416         acpi_thermal_remove_fs(device);
1417
1418         kfree(tz);
1419         return_VALUE(0);
1420 }
1421
1422 static int acpi_thermal_resume(struct acpi_device *device, int state)
1423 {
1424         struct acpi_thermal *tz = NULL;
1425
1426         if (!device || !acpi_driver_data(device))
1427                 return_VALUE(-EINVAL);
1428
1429         tz = (struct acpi_thermal *)acpi_driver_data(device);
1430
1431         acpi_thermal_check(tz);
1432
1433         return AE_OK;
1434 }
1435
1436 static int __init acpi_thermal_init(void)
1437 {
1438         int result = 0;
1439
1440         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1441
1442         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1443         if (!acpi_thermal_dir)
1444                 return_VALUE(-ENODEV);
1445         acpi_thermal_dir->owner = THIS_MODULE;
1446
1447         result = acpi_bus_register_driver(&acpi_thermal_driver);
1448         if (result < 0) {
1449                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1450                 return_VALUE(-ENODEV);
1451         }
1452
1453         return_VALUE(0);
1454 }
1455
1456 static void __exit acpi_thermal_exit(void)
1457 {
1458         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1459
1460         acpi_bus_unregister_driver(&acpi_thermal_driver);
1461
1462         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1463
1464         return_VOID;
1465 }
1466
1467 module_init(acpi_thermal_init);
1468 module_exit(acpi_thermal_exit);