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/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_COMPONENT          0x04000000
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int act;
  79 module_param(act, int, 0644);
  80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  81
  82 static int crt;
  83 module_param(crt, int, 0644);
  84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  85
  86 static int tzp;
  87 module_param(tzp, int, 0444);
  88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  89
  90 static int nocrt;
  91 module_param(nocrt, int, 0);
  92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  93
  94 static int off;
  95 module_param(off, int, 0);
  96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  97
  98 static int psv;
  99 module_param(psv, int, 0644);
 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 101
 102 static int acpi_thermal_add(struct acpi_device *device);
 103 static int acpi_thermal_remove(struct acpi_device *device, int type);
 104 static int acpi_thermal_resume(struct acpi_device *device);
 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 110                                                const char __user *, size_t,
 111                                                loff_t *);
 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 114                                           size_t, loff_t *);
 115
 116 static const struct acpi_device_id  thermal_device_ids[] = {
 117         {ACPI_THERMAL_HID, 0},
 118         {"", 0},
 119 };
 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 121
 122 static struct acpi_driver acpi_thermal_driver = {
 123         .name = "thermal",
 124         .class = ACPI_THERMAL_CLASS,
 125         .ids = thermal_device_ids,
 126         .ops = {
 127                 .add = acpi_thermal_add,
 128                 .remove = acpi_thermal_remove,
 129                 .resume = acpi_thermal_resume,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct timer_list timer;
 198         struct mutex lock;
 199 };
 200
 201 static const struct file_operations acpi_thermal_state_fops = {
 202         .open = acpi_thermal_state_open_fs,
 203         .read = seq_read,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static const struct file_operations acpi_thermal_temp_fops = {
 209         .open = acpi_thermal_temp_open_fs,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 static const struct file_operations acpi_thermal_trip_fops = {
 216         .open = acpi_thermal_trip_open_fs,
 217         .read = seq_read,
 218         .llseek = seq_lseek,
 219         .release = single_release,
 220 };
 221
 222 static const struct file_operations acpi_thermal_cooling_fops = {
 223         .open = acpi_thermal_cooling_open_fs,
 224         .read = seq_read,
 225         .write = acpi_thermal_write_cooling_mode,
 226         .llseek = seq_lseek,
 227         .release = single_release,
 228 };
 229
 230 static const struct file_operations acpi_thermal_polling_fops = {
 231         .open = acpi_thermal_polling_open_fs,
 232         .read = seq_read,
 233         .write = acpi_thermal_write_polling,
 234         .llseek = seq_lseek,
 235         .release = single_release,
 236 };
 237
 238 /* --------------------------------------------------------------------------
 239                              Thermal Zone Management
 240    -------------------------------------------------------------------------- */
 241
 242 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 243 {
 244         acpi_status status = AE_OK;
 245
 246
 247         if (!tz)
 248                 return -EINVAL;
 249
 250         tz->last_temperature = tz->temperature;
 251
 252         status =
 253             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 254         if (ACPI_FAILURE(status))
 255                 return -ENODEV;
 256
 257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 258                           tz->temperature));
 259
 260         return 0;
 261 }
 262
 263 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 264 {
 265         acpi_status status = AE_OK;
 266
 267
 268         if (!tz)
 269                 return -EINVAL;
 270
 271         status =
 272             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 273                                   &tz->polling_frequency);
 274         if (ACPI_FAILURE(status))
 275                 return -ENODEV;
 276
 277         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 278                           tz->polling_frequency));
 279
 280         return 0;
 281 }
 282
 283 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 284 {
 285
 286         if (!tz)
 287                 return -EINVAL;
 288
 289         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 290
 291         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 292                           "Polling frequency set to %lu seconds\n",
 293                           tz->polling_frequency/10));
 294
 295         return 0;
 296 }
 297
 298 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 299 {
 300         acpi_status status = AE_OK;
 301         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 302         struct acpi_object_list arg_list = { 1, &arg0 };
 303         acpi_handle handle = NULL;
 304
 305
 306         if (!tz)
 307                 return -EINVAL;
 308
 309         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 310         if (ACPI_FAILURE(status)) {
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 312                 return -ENODEV;
 313         }
 314
 315         arg0.integer.value = mode;
 316
 317         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 318         if (ACPI_FAILURE(status))
 319                 return -ENODEV;
 320
 321         return 0;
 322 }
 323
 324 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 325 {
 326         acpi_status status = AE_OK;
 327         int i = 0;
 328
 329
 330         if (!tz)
 331                 return -EINVAL;
 332
 333         /* Critical Shutdown (required) */
 334
 335         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 336                                        &tz->trips.critical.temperature);
 337         if (ACPI_FAILURE(status)) {
 338                 tz->trips.critical.flags.valid = 0;
 339                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 340                 return -ENODEV;
 341         } else {
 342                 tz->trips.critical.flags.valid = 1;
 343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 344                                   "Found critical threshold [%lu]\n",
 345                                   tz->trips.critical.temperature));
 346         }
 347
 348         if (tz->trips.critical.flags.valid == 1) {
 349                 if (crt == -1) {
 350                         tz->trips.critical.flags.valid = 0;
 351                 } else if (crt > 0) {
 352                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 353
 354                         /*
 355                          * Allow override to lower critical threshold
 356                          */
 357                         if (crt_k < tz->trips.critical.temperature)
 358                                 tz->trips.critical.temperature = crt_k;
 359                 }
 360         }
 361
 362         /* Critical Sleep (optional) */
 363
 364         status =
 365             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 366                                   &tz->trips.hot.temperature);
 367         if (ACPI_FAILURE(status)) {
 368                 tz->trips.hot.flags.valid = 0;
 369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 370         } else {
 371                 tz->trips.hot.flags.valid = 1;
 372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 373                                   tz->trips.hot.temperature));
 374         }
 375
 376         /* Passive: Processors (optional) */
 377
 378         if (psv == -1) {
 379                 status = AE_SUPPORT;
 380         } else if (psv > 0) {
 381                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 382                 status = AE_OK;
 383         } else {
 384                 status = acpi_evaluate_integer(tz->device->handle,
 385                         "_PSV", NULL, &tz->trips.passive.temperature);
 386         }
 387
 388         if (ACPI_FAILURE(status)) {
 389                 tz->trips.passive.flags.valid = 0;
 390                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 391         } else {
 392                 tz->trips.passive.flags.valid = 1;
 393
 394                 status =
 395                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 396                                           &tz->trips.passive.tc1);
 397                 if (ACPI_FAILURE(status))
 398                         tz->trips.passive.flags.valid = 0;
 399
 400                 status =
 401                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 402                                           &tz->trips.passive.tc2);
 403                 if (ACPI_FAILURE(status))
 404                         tz->trips.passive.flags.valid = 0;
 405
 406                 status =
 407                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 408                                           &tz->trips.passive.tsp);
 409                 if (ACPI_FAILURE(status))
 410                         tz->trips.passive.flags.valid = 0;
 411
 412                 status =
 413                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 414                                             &tz->trips.passive.devices);
 415                 if (ACPI_FAILURE(status))
 416                         tz->trips.passive.flags.valid = 0;
 417
 418                 if (!tz->trips.passive.flags.valid)
 419                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 420                 else
 421                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 422                                           "Found passive threshold [%lu]\n",
 423                                           tz->trips.passive.temperature));
 424         }
 425
 426         /* Active: Fans, etc. (optional) */
 427
 428         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 429
 430                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 431
 432                 if (act == -1)
 433                         break;  /* disable all active trip points */
 434
 435                 status = acpi_evaluate_integer(tz->device->handle,
 436                         name, NULL, &tz->trips.active[i].temperature);
 437
 438                 if (ACPI_FAILURE(status)) {
 439                         if (i == 0)     /* no active trip points */
 440                                 break;
 441                         if (act <= 0)   /* no override requested */
 442                                 break;
 443                         if (i == 1) {   /* 1 trip point */
 444                                 tz->trips.active[0].temperature =
 445                                         CELSIUS_TO_KELVIN(act);
 446                         } else {        /* multiple trips */
 447                                 /*
 448                                  * Don't allow override higher than
 449                                  * the next higher trip point
 450                                  */
 451                                 tz->trips.active[i - 1].temperature =
 452                                     (tz->trips.active[i - 2].temperature <
 453                                         CELSIUS_TO_KELVIN(act) ?
 454                                         tz->trips.active[i - 2].temperature :
 455                                         CELSIUS_TO_KELVIN(act));
 456                         }
 457                         break;
 458                 }
 459
 460                 name[2] = 'L';
 461                 status =
 462                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 463                                             &tz->trips.active[i].devices);
 464                 if (ACPI_SUCCESS(status)) {
 465                         tz->trips.active[i].flags.valid = 1;
 466                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 467                                           "Found active threshold [%d]:[%lu]\n",
 468                                           i, tz->trips.active[i].temperature));
 469                 } else
 470                         ACPI_EXCEPTION((AE_INFO, status,
 471                                         "Invalid active threshold [%d]", i));
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 478 {
 479         acpi_status status = AE_OK;
 480
 481
 482         if (!tz)
 483                 return -EINVAL;
 484
 485         status =
 486             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 487         if (ACPI_FAILURE(status))
 488                 return -ENODEV;
 489
 490         return 0;
 491 }
 492
 493 static int acpi_thermal_critical(struct acpi_thermal *tz)
 494 {
 495         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 496                 return -EINVAL;
 497
 498         if (tz->temperature >= tz->trips.critical.temperature) {
 499                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 500                 tz->trips.critical.flags.enabled = 1;
 501         } else if (tz->trips.critical.flags.enabled)
 502                 tz->trips.critical.flags.enabled = 0;
 503
 504         printk(KERN_EMERG
 505                "Critical temperature reached (%ld C), shutting down.\n",
 506                KELVIN_TO_CELSIUS(tz->temperature));
 507         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 508                                 tz->trips.critical.flags.enabled);
 509         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 510                                           tz->device->dev.bus_id,
 511                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 512                                           tz->trips.critical.flags.enabled);
 513
 514         orderly_poweroff(true);
 515
 516         return 0;
 517 }
 518
 519 static int acpi_thermal_hot(struct acpi_thermal *tz)
 520 {
 521         if (!tz || !tz->trips.hot.flags.valid || nocrt)
 522                 return -EINVAL;
 523
 524         if (tz->temperature >= tz->trips.hot.temperature) {
 525                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 526                 tz->trips.hot.flags.enabled = 1;
 527         } else if (tz->trips.hot.flags.enabled)
 528                 tz->trips.hot.flags.enabled = 0;
 529
 530         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 531                                 tz->trips.hot.flags.enabled);
 532         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 533                                           tz->device->dev.bus_id,
 534                                           ACPI_THERMAL_NOTIFY_HOT,
 535                                           tz->trips.hot.flags.enabled);
 536
 537         /* TBD: Call user-mode "sleep(S4)" function */
 538
 539         return 0;
 540 }
 541
 542 static void acpi_thermal_passive(struct acpi_thermal *tz)
 543 {
 544         int result = 1;
 545         struct acpi_thermal_passive *passive = NULL;
 546         int trend = 0;
 547         int i = 0;
 548
 549
 550         if (!tz || !tz->trips.passive.flags.valid)
 551                 return;
 552
 553         passive = &(tz->trips.passive);
 554
 555         /*
 556          * Above Trip?
 557          * -----------
 558          * Calculate the thermal trend (using the passive cooling equation)
 559          * and modify the performance limit for all passive cooling devices
 560          * accordingly.  Note that we assume symmetry.
 561          */
 562         if (tz->temperature >= passive->temperature) {
 563                 trend =
 564                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 565                     (passive->tc2 * (tz->temperature - passive->temperature));
 566                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 567                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 568                                   trend, passive->tc1, tz->temperature,
 569                                   tz->last_temperature, passive->tc2,
 570                                   tz->temperature, passive->temperature));
 571                 passive->flags.enabled = 1;
 572                 /* Heating up? */
 573                 if (trend > 0)
 574                         for (i = 0; i < passive->devices.count; i++)
 575                                 acpi_processor_set_thermal_limit(passive->
 576                                                                  devices.
 577                                                                  handles[i],
 578                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 579                 /* Cooling off? */
 580                 else if (trend < 0) {
 581                         for (i = 0; i < passive->devices.count; i++)
 582                                 /*
 583                                  * assume that we are on highest
 584                                  * freq/lowest thrott and can leave
 585                                  * passive mode, even in error case
 586                                  */
 587                                 if (!acpi_processor_set_thermal_limit
 588                                     (passive->devices.handles[i],
 589                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 590                                         result = 0;
 591                         /*
 592                          * Leave cooling mode, even if the temp might
 593                          * higher than trip point This is because some
 594                          * machines might have long thermal polling
 595                          * frequencies (tsp) defined. We will fall back
 596                          * into passive mode in next cycle (probably quicker)
 597                          */
 598                         if (result) {
 599                                 passive->flags.enabled = 0;
 600                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 601                                                   "Disabling passive cooling, still above threshold,"
 602                                                   " but we are cooling down\n"));
 603                         }
 604                 }
 605                 return;
 606         }
 607
 608         /*
 609          * Below Trip?
 610          * -----------
 611          * Implement passive cooling hysteresis to slowly increase performance
 612          * and avoid thrashing around the passive trip point.  Note that we
 613          * assume symmetry.
 614          */
 615         if (!passive->flags.enabled)
 616                 return;
 617         for (i = 0; i < passive->devices.count; i++)
 618                 if (!acpi_processor_set_thermal_limit
 619                     (passive->devices.handles[i],
 620                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 621                         result = 0;
 622         if (result) {
 623                 passive->flags.enabled = 0;
 624                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 625                                   "Disabling passive cooling (zone is cool)\n"));
 626         }
 627 }
 628
 629 static void acpi_thermal_active(struct acpi_thermal *tz)
 630 {
 631         int result = 0;
 632         struct acpi_thermal_active *active = NULL;
 633         int i = 0;
 634         int j = 0;
 635         unsigned long maxtemp = 0;
 636
 637
 638         if (!tz)
 639                 return;
 640
 641         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 642                 active = &(tz->trips.active[i]);
 643                 if (!active || !active->flags.valid)
 644                         break;
 645                 if (tz->temperature >= active->temperature) {
 646                         /*
 647                          * Above Threshold?
 648                          * ----------------
 649                          * If not already enabled, turn ON all cooling devices
 650                          * associated with this active threshold.
 651                          */
 652                         if (active->temperature > maxtemp)
 653                                 tz->state.active_index = i;
 654                         maxtemp = active->temperature;
 655                         if (active->flags.enabled)
 656                                 continue;
 657                         for (j = 0; j < active->devices.count; j++) {
 658                                 result =
 659                                     acpi_bus_set_power(active->devices.
 660                                                        handles[j],
 661                                                        ACPI_STATE_D0);
 662                                 if (result) {
 663                                         printk(KERN_WARNING PREFIX
 664                                                       "Unable to turn cooling device [%p] 'on'\n",
 665                                                       active->devices.
 666                                                       handles[j]);
 667                                         continue;
 668                                 }
 669                                 active->flags.enabled = 1;
 670                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 671                                                   "Cooling device [%p] now 'on'\n",
 672                                                   active->devices.handles[j]));
 673                         }
 674                         continue;
 675                 }
 676                 if (!active->flags.enabled)
 677                         continue;
 678                 /*
 679                  * Below Threshold?
 680                  * ----------------
 681                  * Turn OFF all cooling devices associated with this
 682                  * threshold.
 683                  */
 684                 for (j = 0; j < active->devices.count; j++) {
 685                         result = acpi_bus_set_power(active->devices.handles[j],
 686                                                     ACPI_STATE_D3);
 687                         if (result) {
 688                                 printk(KERN_WARNING PREFIX
 689                                               "Unable to turn cooling device [%p] 'off'\n",
 690                                               active->devices.handles[j]);
 691                                 continue;
 692                         }
 693                         active->flags.enabled = 0;
 694                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 695                                           "Cooling device [%p] now 'off'\n",
 696                                           active->devices.handles[j]));
 697                 }
 698         }
 699 }
 700
 701 static void acpi_thermal_check(void *context);
 702
 703 static void acpi_thermal_run(unsigned long data)
 704 {
 705         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 706         if (!tz->zombie)
 707                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 708 }
 709
 710 static void acpi_thermal_check(void *data)
 711 {
 712         int result = 0;
 713         struct acpi_thermal *tz = data;
 714         unsigned long sleep_time = 0;
 715         unsigned long timeout_jiffies = 0;
 716         int i = 0;
 717         struct acpi_thermal_state state;
 718
 719
 720         if (!tz) {
 721                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 722                 return;
 723         }
 724
 725         /* Check if someone else is already running */
 726         if (!mutex_trylock(&tz->lock))
 727                 return;
 728
 729         state = tz->state;
 730
 731         result = acpi_thermal_get_temperature(tz);
 732         if (result)
 733                 goto unlock;
 734
 735         memset(&tz->state, 0, sizeof(tz->state));
 736
 737         /*
 738          * Check Trip Points
 739          * -----------------
 740          * Compare the current temperature to the trip point values to see
 741          * if we've entered one of the thermal policy states.  Note that
 742          * this function determines when a state is entered, but the
 743          * individual policy decides when it is exited (e.g. hysteresis).
 744          */
 745         if (tz->trips.critical.flags.valid)
 746                 state.critical |=
 747                     (tz->temperature >= tz->trips.critical.temperature);
 748         if (tz->trips.hot.flags.valid)
 749                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 750         if (tz->trips.passive.flags.valid)
 751                 state.passive |=
 752                     (tz->temperature >= tz->trips.passive.temperature);
 753         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 754                 if (tz->trips.active[i].flags.valid)
 755                         state.active |=
 756                             (tz->temperature >=
 757                              tz->trips.active[i].temperature);
 758
 759         /*
 760          * Invoke Policy
 761          * -------------
 762          * Separated from the above check to allow individual policy to
 763          * determine when to exit a given state.
 764          */
 765         if (state.critical)
 766                 acpi_thermal_critical(tz);
 767         if (state.hot)
 768                 acpi_thermal_hot(tz);
 769         if (state.passive)
 770                 acpi_thermal_passive(tz);
 771         if (state.active)
 772                 acpi_thermal_active(tz);
 773
 774         /*
 775          * Calculate State
 776          * ---------------
 777          * Again, separated from the above two to allow independent policy
 778          * decisions.
 779          */
 780         tz->state.critical = tz->trips.critical.flags.enabled;
 781         tz->state.hot = tz->trips.hot.flags.enabled;
 782         tz->state.passive = tz->trips.passive.flags.enabled;
 783         tz->state.active = 0;
 784         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 785                 tz->state.active |= tz->trips.active[i].flags.enabled;
 786
 787         /*
 788          * Calculate Sleep Time
 789          * --------------------
 790          * If we're in the passive state, use _TSP's value.  Otherwise
 791          * use the default polling frequency (e.g. _TZP).  If no polling
 792          * frequency is specified then we'll wait forever (at least until
 793          * a thermal event occurs).  Note that _TSP and _TZD values are
 794          * given in 1/10th seconds (we must covert to milliseconds).
 795          */
 796         if (tz->state.passive) {
 797                 sleep_time = tz->trips.passive.tsp * 100;
 798                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 799         } else if (tz->polling_frequency > 0) {
 800                 sleep_time = tz->polling_frequency * 100;
 801                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 802         }
 803
 804         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 805                           tz->name, tz->temperature, sleep_time));
 806
 807         /*
 808          * Schedule Next Poll
 809          * ------------------
 810          */
 811         if (!sleep_time) {
 812                 if (timer_pending(&(tz->timer)))
 813                         del_timer(&(tz->timer));
 814         } else {
 815                 if (timer_pending(&(tz->timer)))
 816                         mod_timer(&(tz->timer), timeout_jiffies);
 817                 else {
 818                         tz->timer.data = (unsigned long)tz;
 819                         tz->timer.function = acpi_thermal_run;
 820                         tz->timer.expires = timeout_jiffies;
 821                         add_timer(&(tz->timer));
 822                 }
 823         }
 824       unlock:
 825         mutex_unlock(&tz->lock);
 826 }
 827
 828 /* --------------------------------------------------------------------------
 829                               FS Interface (/proc)
 830    -------------------------------------------------------------------------- */
 831
 832 static struct proc_dir_entry *acpi_thermal_dir;
 833
 834 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 835 {
 836         struct acpi_thermal *tz = seq->private;
 837
 838
 839         if (!tz)
 840                 goto end;
 841
 842         seq_puts(seq, "state:                   ");
 843
 844         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 845             && !tz->state.active)
 846                 seq_puts(seq, "ok\n");
 847         else {
 848                 if (tz->state.critical)
 849                         seq_puts(seq, "critical ");
 850                 if (tz->state.hot)
 851                         seq_puts(seq, "hot ");
 852                 if (tz->state.passive)
 853                         seq_puts(seq, "passive ");
 854                 if (tz->state.active)
 855                         seq_printf(seq, "active[%d]", tz->state.active_index);
 856                 seq_puts(seq, "\n");
 857         }
 858
 859       end:
 860         return 0;
 861 }
 862
 863 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 864 {
 865         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 866 }
 867
 868 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 869 {
 870         int result = 0;
 871         struct acpi_thermal *tz = seq->private;
 872
 873
 874         if (!tz)
 875                 goto end;
 876
 877         result = acpi_thermal_get_temperature(tz);
 878         if (result)
 879                 goto end;
 880
 881         seq_printf(seq, "temperature:             %ld C\n",
 882                    KELVIN_TO_CELSIUS(tz->temperature));
 883
 884       end:
 885         return 0;
 886 }
 887
 888 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 889 {
 890         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 891 }
 892
 893 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 894 {
 895         struct acpi_thermal *tz = seq->private;
 896         struct acpi_device *device;
 897         acpi_status status;
 898
 899         int i = 0;
 900         int j = 0;
 901
 902
 903         if (!tz)
 904                 goto end;
 905
 906         if (tz->trips.critical.flags.valid)
 907                 seq_printf(seq, "critical (S5):           %ld C%s",
 908                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 909                            nocrt ? " <disabled>\n" : "\n");
 910
 911         if (tz->trips.hot.flags.valid)
 912                 seq_printf(seq, "hot (S4):                %ld C%s",
 913                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 914                            nocrt ? " <disabled>\n" : "\n");
 915
 916         if (tz->trips.passive.flags.valid) {
 917                 seq_printf(seq,
 918                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 919                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 920                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 921                            tz->trips.passive.tsp);
 922                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 923                         status = acpi_bus_get_device(tz->trips.passive.devices.
 924                                                      handles[j], &device);
 925                         seq_printf(seq, "%4.4s ", status ? "" :
 926                                    acpi_device_bid(device));
 927                 }
 928                 seq_puts(seq, "\n");
 929         }
 930
 931         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 932                 if (!(tz->trips.active[i].flags.valid))
 933                         break;
 934                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 935                            i,
 936                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 937                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 938                         status = acpi_bus_get_device(tz->trips.active[i].
 939                                                      devices.handles[j],
 940                                                      &device);
 941                         seq_printf(seq, "%4.4s ", status ? "" :
 942                                    acpi_device_bid(device));
 943                 }
 944                 seq_puts(seq, "\n");
 945         }
 946
 947       end:
 948         return 0;
 949 }
 950
 951 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 952 {
 953         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 954 }
 955
 956 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 957 {
 958         struct acpi_thermal *tz = seq->private;
 959
 960
 961         if (!tz)
 962                 goto end;
 963
 964         if (!tz->flags.cooling_mode)
 965                 seq_puts(seq, "<setting not supported>\n");
 966         else
 967                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 968
 969       end:
 970         return 0;
 971 }
 972
 973 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 974 {
 975         return single_open(file, acpi_thermal_cooling_seq_show,
 976                            PDE(inode)->data);
 977 }
 978
 979 static ssize_t
 980 acpi_thermal_write_cooling_mode(struct file *file,
 981                                 const char __user * buffer,
 982                                 size_t count, loff_t * ppos)
 983 {
 984         struct seq_file *m = file->private_data;
 985         struct acpi_thermal *tz = m->private;
 986         int result = 0;
 987         char mode_string[12] = { '\0' };
 988
 989
 990         if (!tz || (count > sizeof(mode_string) - 1))
 991                 return -EINVAL;
 992
 993         if (!tz->flags.cooling_mode)
 994                 return -ENODEV;
 995
 996         if (copy_from_user(mode_string, buffer, count))
 997                 return -EFAULT;
 998
 999         mode_string[count] = '\0';
1000
1001         result = acpi_thermal_set_cooling_mode(tz,
1002                                                simple_strtoul(mode_string, NULL,
1003                                                               0));
1004         if (result)
1005                 return result;
1006
1007         acpi_thermal_check(tz);
1008
1009         return count;
1010 }
1011
1012 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1013 {
1014         struct acpi_thermal *tz = seq->private;
1015
1016
1017         if (!tz)
1018                 goto end;
1019
1020         if (!tz->polling_frequency) {
1021                 seq_puts(seq, "<polling disabled>\n");
1022                 goto end;
1023         }
1024
1025         seq_printf(seq, "polling frequency:       %lu seconds\n",
1026                    (tz->polling_frequency / 10));
1027
1028       end:
1029         return 0;
1030 }
1031
1032 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1033 {
1034         return single_open(file, acpi_thermal_polling_seq_show,
1035                            PDE(inode)->data);
1036 }
1037
1038 static ssize_t
1039 acpi_thermal_write_polling(struct file *file,
1040                            const char __user * buffer,
1041                            size_t count, loff_t * ppos)
1042 {
1043         struct seq_file *m = file->private_data;
1044         struct acpi_thermal *tz = m->private;
1045         int result = 0;
1046         char polling_string[12] = { '\0' };
1047         int seconds = 0;
1048
1049
1050         if (!tz || (count > sizeof(polling_string) - 1))
1051                 return -EINVAL;
1052
1053         if (copy_from_user(polling_string, buffer, count))
1054                 return -EFAULT;
1055
1056         polling_string[count] = '\0';
1057
1058         seconds = simple_strtoul(polling_string, NULL, 0);
1059
1060         result = acpi_thermal_set_polling(tz, seconds);
1061         if (result)
1062                 return result;
1063
1064         acpi_thermal_check(tz);
1065
1066         return count;
1067 }
1068
1069 static int acpi_thermal_add_fs(struct acpi_device *device)
1070 {
1071         struct proc_dir_entry *entry = NULL;
1072
1073
1074         if (!acpi_device_dir(device)) {
1075                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1076                                                      acpi_thermal_dir);
1077                 if (!acpi_device_dir(device))
1078                         return -ENODEV;
1079                 acpi_device_dir(device)->owner = THIS_MODULE;
1080         }
1081
1082         /* 'state' [R] */
1083         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1084                                   S_IRUGO, acpi_device_dir(device));
1085         if (!entry)
1086                 return -ENODEV;
1087         else {
1088                 entry->proc_fops = &acpi_thermal_state_fops;
1089                 entry->data = acpi_driver_data(device);
1090                 entry->owner = THIS_MODULE;
1091         }
1092
1093         /* 'temperature' [R] */
1094         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1095                                   S_IRUGO, acpi_device_dir(device));
1096         if (!entry)
1097                 return -ENODEV;
1098         else {
1099                 entry->proc_fops = &acpi_thermal_temp_fops;
1100                 entry->data = acpi_driver_data(device);
1101                 entry->owner = THIS_MODULE;
1102         }
1103
1104         /* 'trip_points' [R] */
1105         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1106                                   S_IRUGO,
1107                                   acpi_device_dir(device));
1108         if (!entry)
1109                 return -ENODEV;
1110         else {
1111                 entry->proc_fops = &acpi_thermal_trip_fops;
1112                 entry->data = acpi_driver_data(device);
1113                 entry->owner = THIS_MODULE;
1114         }
1115
1116         /* 'cooling_mode' [R/W] */
1117         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1118                                   S_IFREG | S_IRUGO | S_IWUSR,
1119                                   acpi_device_dir(device));
1120         if (!entry)
1121                 return -ENODEV;
1122         else {
1123                 entry->proc_fops = &acpi_thermal_cooling_fops;
1124                 entry->data = acpi_driver_data(device);
1125                 entry->owner = THIS_MODULE;
1126         }
1127
1128         /* 'polling_frequency' [R/W] */
1129         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1130                                   S_IFREG | S_IRUGO | S_IWUSR,
1131                                   acpi_device_dir(device));
1132         if (!entry)
1133                 return -ENODEV;
1134         else {
1135                 entry->proc_fops = &acpi_thermal_polling_fops;
1136                 entry->data = acpi_driver_data(device);
1137                 entry->owner = THIS_MODULE;
1138         }
1139
1140         return 0;
1141 }
1142
1143 static int acpi_thermal_remove_fs(struct acpi_device *device)
1144 {
1145
1146         if (acpi_device_dir(device)) {
1147                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1148                                   acpi_device_dir(device));
1149                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1154                                   acpi_device_dir(device));
1155                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1156                                   acpi_device_dir(device));
1157                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1158                 acpi_device_dir(device) = NULL;
1159         }
1160
1161         return 0;
1162 }
1163
1164 /* --------------------------------------------------------------------------
1165                                  Driver Interface
1166    -------------------------------------------------------------------------- */
1167
1168 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1169 {
1170         struct acpi_thermal *tz = data;
1171         struct acpi_device *device = NULL;
1172
1173
1174         if (!tz)
1175                 return;
1176
1177         device = tz->device;
1178
1179         switch (event) {
1180         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1181                 acpi_thermal_check(tz);
1182                 break;
1183         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1184                 acpi_thermal_get_trip_points(tz);
1185                 acpi_thermal_check(tz);
1186                 acpi_bus_generate_proc_event(device, event, 0);
1187                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1188                                                   device->dev.bus_id, event, 0);
1189                 break;
1190         case ACPI_THERMAL_NOTIFY_DEVICES:
1191                 if (tz->flags.devices)
1192                         acpi_thermal_get_devices(tz);
1193                 acpi_bus_generate_proc_event(device, event, 0);
1194                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1195                                                   device->dev.bus_id, event, 0);
1196                 break;
1197         default:
1198                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1199                                   "Unsupported event [0x%x]\n", event));
1200                 break;
1201         }
1202
1203         return;
1204 }
1205
1206 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1207 {
1208         int result = 0;
1209
1210
1211         if (!tz)
1212                 return -EINVAL;
1213
1214         /* Get temperature [_TMP] (required) */
1215         result = acpi_thermal_get_temperature(tz);
1216         if (result)
1217                 return result;
1218
1219         /* Get trip points [_CRT, _PSV, etc.] (required) */
1220         result = acpi_thermal_get_trip_points(tz);
1221         if (result)
1222                 return result;
1223
1224         /* Set the cooling mode [_SCP] to active cooling (default) */
1225         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1226         if (!result)
1227                 tz->flags.cooling_mode = 1;
1228
1229         /* Get default polling frequency [_TZP] (optional) */
1230         if (tzp)
1231                 tz->polling_frequency = tzp;
1232         else
1233                 acpi_thermal_get_polling_frequency(tz);
1234
1235         /* Get devices in this thermal zone [_TZD] (optional) */
1236         result = acpi_thermal_get_devices(tz);
1237         if (!result)
1238                 tz->flags.devices = 1;
1239
1240         return 0;
1241 }
1242
1243 static int acpi_thermal_add(struct acpi_device *device)
1244 {
1245         int result = 0;
1246         acpi_status status = AE_OK;
1247         struct acpi_thermal *tz = NULL;
1248
1249
1250         if (!device)
1251                 return -EINVAL;
1252
1253         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1254         if (!tz)
1255                 return -ENOMEM;
1256
1257         tz->device = device;
1258         strcpy(tz->name, device->pnp.bus_id);
1259         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1260         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1261         acpi_driver_data(device) = tz;
1262         mutex_init(&tz->lock);
1263         result = acpi_thermal_get_info(tz);
1264         if (result)
1265                 goto end;
1266
1267         result = acpi_thermal_add_fs(device);
1268         if (result)
1269                 goto end;
1270
1271         init_timer(&tz->timer);
1272
1273         acpi_thermal_check(tz);
1274
1275         status = acpi_install_notify_handler(device->handle,
1276                                              ACPI_DEVICE_NOTIFY,
1277                                              acpi_thermal_notify, tz);
1278         if (ACPI_FAILURE(status)) {
1279                 result = -ENODEV;
1280                 goto end;
1281         }
1282
1283         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1284                acpi_device_name(device), acpi_device_bid(device),
1285                KELVIN_TO_CELSIUS(tz->temperature));
1286
1287       end:
1288         if (result) {
1289                 acpi_thermal_remove_fs(device);
1290                 kfree(tz);
1291         }
1292
1293         return result;
1294 }
1295
1296 static int acpi_thermal_remove(struct acpi_device *device, int type)
1297 {
1298         acpi_status status = AE_OK;
1299         struct acpi_thermal *tz = NULL;
1300
1301
1302         if (!device || !acpi_driver_data(device))
1303                 return -EINVAL;
1304
1305         tz = acpi_driver_data(device);
1306
1307         /* avoid timer adding new defer task */
1308         tz->zombie = 1;
1309         /* wait for running timer (on other CPUs) finish */
1310         del_timer_sync(&(tz->timer));
1311         /* synchronize deferred task */
1312         acpi_os_wait_events_complete(NULL);
1313         /* deferred task may reinsert timer */
1314         del_timer_sync(&(tz->timer));
1315
1316         status = acpi_remove_notify_handler(device->handle,
1317                                             ACPI_DEVICE_NOTIFY,
1318                                             acpi_thermal_notify);
1319
1320         /* Terminate policy */
1321         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1322                 tz->trips.passive.flags.enabled = 0;
1323                 acpi_thermal_passive(tz);
1324         }
1325         if (tz->trips.active[0].flags.valid
1326             && tz->trips.active[0].flags.enabled) {
1327                 tz->trips.active[0].flags.enabled = 0;
1328                 acpi_thermal_active(tz);
1329         }
1330
1331         acpi_thermal_remove_fs(device);
1332         mutex_destroy(&tz->lock);
1333         kfree(tz);
1334         return 0;
1335 }
1336
1337 static int acpi_thermal_resume(struct acpi_device *device)
1338 {
1339         struct acpi_thermal *tz = NULL;
1340         int i, j, power_state, result;
1341
1342
1343         if (!device || !acpi_driver_data(device))
1344                 return -EINVAL;
1345
1346         tz = acpi_driver_data(device);
1347
1348         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1349                 if (!(&tz->trips.active[i]))
1350                         break;
1351                 if (!tz->trips.active[i].flags.valid)
1352                         break;
1353                 tz->trips.active[i].flags.enabled = 1;
1354                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1355                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1356                             handles[j], &power_state);
1357                         if (result || (power_state != ACPI_STATE_D0)) {
1358                                 tz->trips.active[i].flags.enabled = 0;
1359                                 break;
1360                         }
1361                 }
1362                 tz->state.active |= tz->trips.active[i].flags.enabled;
1363         }
1364
1365         acpi_thermal_check(tz);
1366
1367         return AE_OK;
1368 }
1369
1370 #ifdef CONFIG_DMI
1371 static int thermal_act(const struct dmi_system_id *d) {
1372
1373         if (act == 0) {
1374                 printk(KERN_NOTICE "ACPI: %s detected: "
1375                         "disabling all active thermal trip points\n", d->ident);
1376                 act = -1;
1377         }
1378         return 0;
1379 }
1380 static int thermal_nocrt(const struct dmi_system_id *d) {
1381
1382         printk(KERN_NOTICE "ACPI: %s detected: "
1383                 "disabling all critical thermal trip point actions.\n", d->ident);
1384         nocrt = 1;
1385         return 0;
1386 }
1387 static int thermal_tzp(const struct dmi_system_id *d) {
1388
1389         if (tzp == 0) {
1390                 printk(KERN_NOTICE "ACPI: %s detected: "
1391                         "enabling thermal zone polling\n", d->ident);
1392                 tzp = 300;      /* 300 dS = 30 Seconds */
1393         }
1394         return 0;
1395 }
1396 static int thermal_psv(const struct dmi_system_id *d) {
1397
1398         if (psv == 0) {
1399                 printk(KERN_NOTICE "ACPI: %s detected: "
1400                         "disabling all passive thermal trip points\n", d->ident);
1401                 psv = -1;
1402         }
1403         return 0;
1404 }
1405
1406 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1407         /*
1408          * Award BIOS on this AOpen makes thermal control almost worthless.
1409          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1410          */
1411         {
1412          .callback = thermal_act,
1413          .ident = "AOpen i915GMm-HFS",
1414          .matches = {
1415                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1416                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1417                 },
1418         },
1419         {
1420          .callback = thermal_psv,
1421          .ident = "AOpen i915GMm-HFS",
1422          .matches = {
1423                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1424                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1425                 },
1426         },
1427         {
1428          .callback = thermal_tzp,
1429          .ident = "AOpen i915GMm-HFS",
1430          .matches = {
1431                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1432                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1433                 },
1434         },
1435         {
1436          .callback = thermal_nocrt,
1437          .ident = "Gigabyte GA-7ZX",
1438          .matches = {
1439                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1440                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1441                 },
1442         },
1443         {}
1444 };
1445 #endif /* CONFIG_DMI */
1446
1447 static int __init acpi_thermal_init(void)
1448 {
1449         int result = 0;
1450
1451         dmi_check_system(thermal_dmi_table);
1452
1453         if (off) {
1454                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1455                 return -ENODEV;
1456         }
1457         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1458         if (!acpi_thermal_dir)
1459                 return -ENODEV;
1460         acpi_thermal_dir->owner = THIS_MODULE;
1461
1462         result = acpi_bus_register_driver(&acpi_thermal_driver);
1463         if (result < 0) {
1464                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1465                 return -ENODEV;
1466         }
1467
1468         return 0;
1469 }
1470
1471 static void __exit acpi_thermal_exit(void)
1472 {
1473
1474         acpi_bus_unregister_driver(&acpi_thermal_driver);
1475
1476         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1477
1478         return;
1479 }
1480
1481 module_init(acpi_thermal_init);
1482 module_exit(acpi_thermal_exit);