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