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