drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_COMPONENT          0x04000000
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int act;
  79 module_param(act, int, 0644);
  80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  81
  82 static int crt;
  83 module_param(crt, int, 0644);
  84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  85
  86 static int tzp;
  87 module_param(tzp, int, 0444);
  88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  89
  90 static int nocrt;
  91 module_param(nocrt, int, 0);
  92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  93
  94 static int off;
  95 module_param(off, int, 0);
  96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  97
  98 static int psv;
  99 module_param(psv, int, 0644);
 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 101
 102 static int acpi_thermal_add(struct acpi_device *device);
 103 static int acpi_thermal_remove(struct acpi_device *device, int type);
 104 static int acpi_thermal_resume(struct acpi_device *device);
 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 110                                                const char __user *, size_t,
 111                                                loff_t *);
 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 114                                           size_t, loff_t *);
 115
 116 static const struct acpi_device_id  thermal_device_ids[] = {
 117         {ACPI_THERMAL_HID, 0},
 118         {"", 0},
 119 };
 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 121
 122 static struct acpi_driver acpi_thermal_driver = {
 123         .name = "thermal",
 124         .class = ACPI_THERMAL_CLASS,
 125         .ids = thermal_device_ids,
 126         .ops = {
 127                 .add = acpi_thermal_add,
 128                 .remove = acpi_thermal_remove,
 129                 .resume = acpi_thermal_resume,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct timer_list timer;
 198         struct mutex lock;
 199 };
 200
 201 static const struct file_operations acpi_thermal_state_fops = {
 202         .open = acpi_thermal_state_open_fs,
 203         .read = seq_read,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static const struct file_operations acpi_thermal_temp_fops = {
 209         .open = acpi_thermal_temp_open_fs,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 static const struct file_operations acpi_thermal_trip_fops = {
 216         .open = acpi_thermal_trip_open_fs,
 217         .read = seq_read,
 218         .llseek = seq_lseek,
 219         .release = single_release,
 220 };
 221
 222 static const struct file_operations acpi_thermal_cooling_fops = {
 223         .open = acpi_thermal_cooling_open_fs,
 224         .read = seq_read,
 225         .write = acpi_thermal_write_cooling_mode,
 226         .llseek = seq_lseek,
 227         .release = single_release,
 228 };
 229
 230 static const struct file_operations acpi_thermal_polling_fops = {
 231         .open = acpi_thermal_polling_open_fs,
 232         .read = seq_read,
 233         .write = acpi_thermal_write_polling,
 234         .llseek = seq_lseek,
 235         .release = single_release,
 236 };
 237
 238 /* --------------------------------------------------------------------------
 239                              Thermal Zone Management
 240    -------------------------------------------------------------------------- */
 241
 242 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 243 {
 244         acpi_status status = AE_OK;
 245
 246
 247         if (!tz)
 248                 return -EINVAL;
 249
 250         tz->last_temperature = tz->temperature;
 251
 252         status =
 253             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 254         if (ACPI_FAILURE(status))
 255                 return -ENODEV;
 256
 257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 258                           tz->temperature));
 259
 260         return 0;
 261 }
 262
 263 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 264 {
 265         acpi_status status = AE_OK;
 266
 267
 268         if (!tz)
 269                 return -EINVAL;
 270
 271         status =
 272             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 273                                   &tz->polling_frequency);
 274         if (ACPI_FAILURE(status))
 275                 return -ENODEV;
 276
 277         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 278                           tz->polling_frequency));
 279
 280         return 0;
 281 }
 282
 283 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 284 {
 285
 286         if (!tz)
 287                 return -EINVAL;
 288
 289         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 290
 291         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 292                           "Polling frequency set to %lu seconds\n",
 293                           tz->polling_frequency/10));
 294
 295         return 0;
 296 }
 297
 298 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 299 {
 300         acpi_status status = AE_OK;
 301         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 302         struct acpi_object_list arg_list = { 1, &arg0 };
 303         acpi_handle handle = NULL;
 304
 305
 306         if (!tz)
 307                 return -EINVAL;
 308
 309         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 310         if (ACPI_FAILURE(status)) {
 311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 312                 return -ENODEV;
 313         }
 314
 315         arg0.integer.value = mode;
 316
 317         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 318         if (ACPI_FAILURE(status))
 319                 return -ENODEV;
 320
 321         return 0;
 322 }
 323
 324 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 325 {
 326         acpi_status status = AE_OK;
 327         int i = 0;
 328
 329
 330         if (!tz)
 331                 return -EINVAL;
 332
 333         /* Critical Shutdown (required) */
 334
 335         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 336                                        &tz->trips.critical.temperature);
 337         if (ACPI_FAILURE(status)) {
 338                 tz->trips.critical.flags.valid = 0;
 339                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 340                 return -ENODEV;
 341         } else {
 342                 tz->trips.critical.flags.valid = 1;
 343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 344                                   "Found critical threshold [%lu]\n",
 345                                   tz->trips.critical.temperature));
 346         }
 347
 348         if (tz->trips.critical.flags.valid == 1) {
 349                 if (crt == -1) {
 350                         tz->trips.critical.flags.valid = 0;
 351                 } else if (crt > 0) {
 352                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 353
 354                         /*
 355                          * Allow override to lower critical threshold
 356                          */
 357                         if (crt_k < tz->trips.critical.temperature)
 358                                 tz->trips.critical.temperature = crt_k;
 359                 }
 360         }
 361
 362         /* Critical Sleep (optional) */
 363
 364         status =
 365             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 366                                   &tz->trips.hot.temperature);
 367         if (ACPI_FAILURE(status)) {
 368                 tz->trips.hot.flags.valid = 0;
 369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 370         } else {
 371                 tz->trips.hot.flags.valid = 1;
 372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 373                                   tz->trips.hot.temperature));
 374         }
 375
 376         /* Passive: Processors (optional) */
 377
 378         if (psv == -1) {
 379                 status = AE_SUPPORT;
 380         } else if (psv > 0) {
 381                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 382                 status = AE_OK;
 383         } else {
 384                 status = acpi_evaluate_integer(tz->device->handle,
 385                         "_PSV", NULL, &tz->trips.passive.temperature);
 386         }
 387
 388         if (ACPI_FAILURE(status)) {
 389                 tz->trips.passive.flags.valid = 0;
 390                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 391         } else {
 392                 tz->trips.passive.flags.valid = 1;
 393
 394                 status =
 395                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 396                                           &tz->trips.passive.tc1);
 397                 if (ACPI_FAILURE(status))
 398                         tz->trips.passive.flags.valid = 0;
 399
 400                 status =
 401                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 402                                           &tz->trips.passive.tc2);
 403                 if (ACPI_FAILURE(status))
 404                         tz->trips.passive.flags.valid = 0;
 405
 406                 status =
 407                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 408                                           &tz->trips.passive.tsp);
 409                 if (ACPI_FAILURE(status))
 410                         tz->trips.passive.flags.valid = 0;
 411
 412                 status =
 413                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 414                                             &tz->trips.passive.devices);
 415                 if (ACPI_FAILURE(status))
 416                         tz->trips.passive.flags.valid = 0;
 417
 418                 if (!tz->trips.passive.flags.valid)
 419                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 420                 else
 421                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 422                                           "Found passive threshold [%lu]\n",
 423                                           tz->trips.passive.temperature));
 424         }
 425
 426         /* Active: Fans, etc. (optional) */
 427
 428         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 429
 430                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 431
 432                 if (act == -1)
 433                         break;  /* disable all active trip points */
 434
 435                 status = acpi_evaluate_integer(tz->device->handle,
 436                         name, NULL, &tz->trips.active[i].temperature);
 437
 438                 if (ACPI_FAILURE(status)) {
 439                         if (i == 0)     /* no active trip points */
 440                                 break;
 441                         if (act <= 0)   /* no override requested */
 442                                 break;
 443                         if (i == 1) {   /* 1 trip point */
 444                                 tz->trips.active[0].temperature =
 445                                         CELSIUS_TO_KELVIN(act);
 446                         } else {        /* multiple trips */
 447                                 /*
 448                                  * Don't allow override higher than
 449                                  * the next higher trip point
 450                                  */
 451                                 tz->trips.active[i - 1].temperature =
 452                                     (tz->trips.active[i - 2].temperature <
 453                                         CELSIUS_TO_KELVIN(act) ?
 454                                         tz->trips.active[i - 2].temperature :
 455                                         CELSIUS_TO_KELVIN(act));
 456                         }
 457                         break;
 458                 }
 459
 460                 name[2] = 'L';
 461                 status =
 462                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 463                                             &tz->trips.active[i].devices);
 464                 if (ACPI_SUCCESS(status)) {
 465                         tz->trips.active[i].flags.valid = 1;
 466                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 467                                           "Found active threshold [%d]:[%lu]\n",
 468                                           i, tz->trips.active[i].temperature));
 469                 } else
 470                         ACPI_EXCEPTION((AE_INFO, status,
 471                                         "Invalid active threshold [%d]", i));
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 478 {
 479         acpi_status status = AE_OK;
 480
 481
 482         if (!tz)
 483                 return -EINVAL;
 484
 485         status =
 486             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 487         if (ACPI_FAILURE(status))
 488                 return -ENODEV;
 489
 490         return 0;
 491 }
 492
 493 static int acpi_thermal_critical(struct acpi_thermal *tz)
 494 {
 495         if (!tz || !tz->trips.critical.flags.valid)
 496                 return -EINVAL;
 497
 498         if (tz->temperature >= tz->trips.critical.temperature) {
 499                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 500                 tz->trips.critical.flags.enabled = 1;
 501         } else if (tz->trips.critical.flags.enabled)
 502                 tz->trips.critical.flags.enabled = 0;
 503
 504         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 505                                 tz->trips.critical.flags.enabled);
 506         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 507                                           tz->device->dev.bus_id,
 508                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 509                                           tz->trips.critical.flags.enabled);
 510
 511         /* take no action if nocrt is set */
 512         if(!nocrt) {
 513                 printk(KERN_EMERG
 514                         "Critical temperature reached (%ld C), shutting down.\n",
 515                         KELVIN_TO_CELSIUS(tz->temperature));
 516                 orderly_poweroff(true);
 517         }
 518
 519         return 0;
 520 }
 521
 522 static int acpi_thermal_hot(struct acpi_thermal *tz)
 523 {
 524         if (!tz || !tz->trips.hot.flags.valid)
 525                 return -EINVAL;
 526
 527         if (tz->temperature >= tz->trips.hot.temperature) {
 528                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 529                 tz->trips.hot.flags.enabled = 1;
 530         } else if (tz->trips.hot.flags.enabled)
 531                 tz->trips.hot.flags.enabled = 0;
 532
 533         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 534                                 tz->trips.hot.flags.enabled);
 535         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 536                                           tz->device->dev.bus_id,
 537                                           ACPI_THERMAL_NOTIFY_HOT,
 538                                           tz->trips.hot.flags.enabled);
 539
 540         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 541
 542         return 0;
 543 }
 544
 545 static void acpi_thermal_passive(struct acpi_thermal *tz)
 546 {
 547         int result = 1;
 548         struct acpi_thermal_passive *passive = NULL;
 549         int trend = 0;
 550         int i = 0;
 551
 552
 553         if (!tz || !tz->trips.passive.flags.valid)
 554                 return;
 555
 556         passive = &(tz->trips.passive);
 557
 558         /*
 559          * Above Trip?
 560          * -----------
 561          * Calculate the thermal trend (using the passive cooling equation)
 562          * and modify the performance limit for all passive cooling devices
 563          * accordingly.  Note that we assume symmetry.
 564          */
 565         if (tz->temperature >= passive->temperature) {
 566                 trend =
 567                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 568                     (passive->tc2 * (tz->temperature - passive->temperature));
 569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 570                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 571                                   trend, passive->tc1, tz->temperature,
 572                                   tz->last_temperature, passive->tc2,
 573                                   tz->temperature, passive->temperature));
 574                 passive->flags.enabled = 1;
 575                 /* Heating up? */
 576                 if (trend > 0)
 577                         for (i = 0; i < passive->devices.count; i++)
 578                                 acpi_processor_set_thermal_limit(passive->
 579                                                                  devices.
 580                                                                  handles[i],
 581                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 582                 /* Cooling off? */
 583                 else if (trend < 0) {
 584                         for (i = 0; i < passive->devices.count; i++)
 585                                 /*
 586                                  * assume that we are on highest
 587                                  * freq/lowest thrott and can leave
 588                                  * passive mode, even in error case
 589                                  */
 590                                 if (!acpi_processor_set_thermal_limit
 591                                     (passive->devices.handles[i],
 592                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 593                                         result = 0;
 594                         /*
 595                          * Leave cooling mode, even if the temp might
 596                          * higher than trip point This is because some
 597                          * machines might have long thermal polling
 598                          * frequencies (tsp) defined. We will fall back
 599                          * into passive mode in next cycle (probably quicker)
 600                          */
 601                         if (result) {
 602                                 passive->flags.enabled = 0;
 603                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                                                   "Disabling passive cooling, still above threshold,"
 605                                                   " but we are cooling down\n"));
 606                         }
 607                 }
 608                 return;
 609         }
 610
 611         /*
 612          * Below Trip?
 613          * -----------
 614          * Implement passive cooling hysteresis to slowly increase performance
 615          * and avoid thrashing around the passive trip point.  Note that we
 616          * assume symmetry.
 617          */
 618         if (!passive->flags.enabled)
 619                 return;
 620         for (i = 0; i < passive->devices.count; i++)
 621                 if (!acpi_processor_set_thermal_limit
 622                     (passive->devices.handles[i],
 623                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 624                         result = 0;
 625         if (result) {
 626                 passive->flags.enabled = 0;
 627                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 628                                   "Disabling passive cooling (zone is cool)\n"));
 629         }
 630 }
 631
 632 static void acpi_thermal_active(struct acpi_thermal *tz)
 633 {
 634         int result = 0;
 635         struct acpi_thermal_active *active = NULL;
 636         int i = 0;
 637         int j = 0;
 638         unsigned long maxtemp = 0;
 639
 640
 641         if (!tz)
 642                 return;
 643
 644         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 645                 active = &(tz->trips.active[i]);
 646                 if (!active || !active->flags.valid)
 647                         break;
 648                 if (tz->temperature >= active->temperature) {
 649                         /*
 650                          * Above Threshold?
 651                          * ----------------
 652                          * If not already enabled, turn ON all cooling devices
 653                          * associated with this active threshold.
 654                          */
 655                         if (active->temperature > maxtemp)
 656                                 tz->state.active_index = i;
 657                         maxtemp = active->temperature;
 658                         if (active->flags.enabled)
 659                                 continue;
 660                         for (j = 0; j < active->devices.count; j++) {
 661                                 result =
 662                                     acpi_bus_set_power(active->devices.
 663                                                        handles[j],
 664                                                        ACPI_STATE_D0);
 665                                 if (result) {
 666                                         printk(KERN_WARNING PREFIX
 667                                                       "Unable to turn cooling device [%p] 'on'\n",
 668                                                       active->devices.
 669                                                       handles[j]);
 670                                         continue;
 671                                 }
 672                                 active->flags.enabled = 1;
 673                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 674                                                   "Cooling device [%p] now 'on'\n",
 675                                                   active->devices.handles[j]));
 676                         }
 677                         continue;
 678                 }
 679                 if (!active->flags.enabled)
 680                         continue;
 681                 /*
 682                  * Below Threshold?
 683                  * ----------------
 684                  * Turn OFF all cooling devices associated with this
 685                  * threshold.
 686                  */
 687                 for (j = 0; j < active->devices.count; j++) {
 688                         result = acpi_bus_set_power(active->devices.handles[j],
 689                                                     ACPI_STATE_D3);
 690                         if (result) {
 691                                 printk(KERN_WARNING PREFIX
 692                                               "Unable to turn cooling device [%p] 'off'\n",
 693                                               active->devices.handles[j]);
 694                                 continue;
 695                         }
 696                         active->flags.enabled = 0;
 697                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 698                                           "Cooling device [%p] now 'off'\n",
 699                                           active->devices.handles[j]));
 700                 }
 701         }
 702 }
 703
 704 static void acpi_thermal_check(void *context);
 705
 706 static void acpi_thermal_run(unsigned long data)
 707 {
 708         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 709         if (!tz->zombie)
 710                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 711 }
 712
 713 static void acpi_thermal_check(void *data)
 714 {
 715         int result = 0;
 716         struct acpi_thermal *tz = data;
 717         unsigned long sleep_time = 0;
 718         unsigned long timeout_jiffies = 0;
 719         int i = 0;
 720         struct acpi_thermal_state state;
 721
 722
 723         if (!tz) {
 724                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 725                 return;
 726         }
 727
 728         /* Check if someone else is already running */
 729         if (!mutex_trylock(&tz->lock))
 730                 return;
 731
 732         state = tz->state;
 733
 734         result = acpi_thermal_get_temperature(tz);
 735         if (result)
 736                 goto unlock;
 737
 738         memset(&tz->state, 0, sizeof(tz->state));
 739
 740         /*
 741          * Check Trip Points
 742          * -----------------
 743          * Compare the current temperature to the trip point values to see
 744          * if we've entered one of the thermal policy states.  Note that
 745          * this function determines when a state is entered, but the
 746          * individual policy decides when it is exited (e.g. hysteresis).
 747          */
 748         if (tz->trips.critical.flags.valid)
 749                 state.critical |=
 750                     (tz->temperature >= tz->trips.critical.temperature);
 751         if (tz->trips.hot.flags.valid)
 752                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 753         if (tz->trips.passive.flags.valid)
 754                 state.passive |=
 755                     (tz->temperature >= tz->trips.passive.temperature);
 756         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 757                 if (tz->trips.active[i].flags.valid)
 758                         state.active |=
 759                             (tz->temperature >=
 760                              tz->trips.active[i].temperature);
 761
 762         /*
 763          * Invoke Policy
 764          * -------------
 765          * Separated from the above check to allow individual policy to
 766          * determine when to exit a given state.
 767          */
 768         if (state.critical)
 769                 acpi_thermal_critical(tz);
 770         if (state.hot)
 771                 acpi_thermal_hot(tz);
 772         if (state.passive)
 773                 acpi_thermal_passive(tz);
 774         if (state.active)
 775                 acpi_thermal_active(tz);
 776
 777         /*
 778          * Calculate State
 779          * ---------------
 780          * Again, separated from the above two to allow independent policy
 781          * decisions.
 782          */
 783         tz->state.critical = tz->trips.critical.flags.enabled;
 784         tz->state.hot = tz->trips.hot.flags.enabled;
 785         tz->state.passive = tz->trips.passive.flags.enabled;
 786         tz->state.active = 0;
 787         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 788                 tz->state.active |= tz->trips.active[i].flags.enabled;
 789
 790         /*
 791          * Calculate Sleep Time
 792          * --------------------
 793          * If we're in the passive state, use _TSP's value.  Otherwise
 794          * use the default polling frequency (e.g. _TZP).  If no polling
 795          * frequency is specified then we'll wait forever (at least until
 796          * a thermal event occurs).  Note that _TSP and _TZD values are
 797          * given in 1/10th seconds (we must covert to milliseconds).
 798          */
 799         if (tz->state.passive) {
 800                 sleep_time = tz->trips.passive.tsp * 100;
 801                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 802         } else if (tz->polling_frequency > 0) {
 803                 sleep_time = tz->polling_frequency * 100;
 804                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 805         }
 806
 807         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 808                           tz->name, tz->temperature, sleep_time));
 809
 810         /*
 811          * Schedule Next Poll
 812          * ------------------
 813          */
 814         if (!sleep_time) {
 815                 if (timer_pending(&(tz->timer)))
 816                         del_timer(&(tz->timer));
 817         } else {
 818                 if (timer_pending(&(tz->timer)))
 819                         mod_timer(&(tz->timer), timeout_jiffies);
 820                 else {
 821                         tz->timer.data = (unsigned long)tz;
 822                         tz->timer.function = acpi_thermal_run;
 823                         tz->timer.expires = timeout_jiffies;
 824                         add_timer(&(tz->timer));
 825                 }
 826         }
 827       unlock:
 828         mutex_unlock(&tz->lock);
 829 }
 830
 831 /* --------------------------------------------------------------------------
 832                               FS Interface (/proc)
 833    -------------------------------------------------------------------------- */
 834
 835 static struct proc_dir_entry *acpi_thermal_dir;
 836
 837 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 838 {
 839         struct acpi_thermal *tz = seq->private;
 840
 841
 842         if (!tz)
 843                 goto end;
 844
 845         seq_puts(seq, "state:                   ");
 846
 847         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 848             && !tz->state.active)
 849                 seq_puts(seq, "ok\n");
 850         else {
 851                 if (tz->state.critical)
 852                         seq_puts(seq, "critical ");
 853                 if (tz->state.hot)
 854                         seq_puts(seq, "hot ");
 855                 if (tz->state.passive)
 856                         seq_puts(seq, "passive ");
 857                 if (tz->state.active)
 858                         seq_printf(seq, "active[%d]", tz->state.active_index);
 859                 seq_puts(seq, "\n");
 860         }
 861
 862       end:
 863         return 0;
 864 }
 865
 866 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 867 {
 868         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 869 }
 870
 871 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 872 {
 873         int result = 0;
 874         struct acpi_thermal *tz = seq->private;
 875
 876
 877         if (!tz)
 878                 goto end;
 879
 880         result = acpi_thermal_get_temperature(tz);
 881         if (result)
 882                 goto end;
 883
 884         seq_printf(seq, "temperature:             %ld C\n",
 885                    KELVIN_TO_CELSIUS(tz->temperature));
 886
 887       end:
 888         return 0;
 889 }
 890
 891 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 892 {
 893         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 894 }
 895
 896 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 897 {
 898         struct acpi_thermal *tz = seq->private;
 899         struct acpi_device *device;
 900         acpi_status status;
 901
 902         int i = 0;
 903         int j = 0;
 904
 905
 906         if (!tz)
 907                 goto end;
 908
 909         if (tz->trips.critical.flags.valid)
 910                 seq_printf(seq, "critical (S5):           %ld C%s",
 911                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
 912                            nocrt ? " <disabled>\n" : "\n");
 913
 914         if (tz->trips.hot.flags.valid)
 915                 seq_printf(seq, "hot (S4):                %ld C%s",
 916                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
 917                            nocrt ? " <disabled>\n" : "\n");
 918
 919         if (tz->trips.passive.flags.valid) {
 920                 seq_printf(seq,
 921                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 922                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 923                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 924                            tz->trips.passive.tsp);
 925                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 926                         status = acpi_bus_get_device(tz->trips.passive.devices.
 927                                                      handles[j], &device);
 928                         seq_printf(seq, "%4.4s ", status ? "" :
 929                                    acpi_device_bid(device));
 930                 }
 931                 seq_puts(seq, "\n");
 932         }
 933
 934         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 935                 if (!(tz->trips.active[i].flags.valid))
 936                         break;
 937                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 938                            i,
 939                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 940                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 941                         status = acpi_bus_get_device(tz->trips.active[i].
 942                                                      devices.handles[j],
 943                                                      &device);
 944                         seq_printf(seq, "%4.4s ", status ? "" :
 945                                    acpi_device_bid(device));
 946                 }
 947                 seq_puts(seq, "\n");
 948         }
 949
 950       end:
 951         return 0;
 952 }
 953
 954 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 955 {
 956         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 957 }
 958
 959 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 960 {
 961         struct acpi_thermal *tz = seq->private;
 962
 963
 964         if (!tz)
 965                 goto end;
 966
 967         if (!tz->flags.cooling_mode)
 968                 seq_puts(seq, "<setting not supported>\n");
 969         else
 970                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 971
 972       end:
 973         return 0;
 974 }
 975
 976 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 977 {
 978         return single_open(file, acpi_thermal_cooling_seq_show,
 979                            PDE(inode)->data);
 980 }
 981
 982 static ssize_t
 983 acpi_thermal_write_cooling_mode(struct file *file,
 984                                 const char __user * buffer,
 985                                 size_t count, loff_t * ppos)
 986 {
 987         struct seq_file *m = file->private_data;
 988         struct acpi_thermal *tz = m->private;
 989         int result = 0;
 990         char mode_string[12] = { '\0' };
 991
 992
 993         if (!tz || (count > sizeof(mode_string) - 1))
 994                 return -EINVAL;
 995
 996         if (!tz->flags.cooling_mode)
 997                 return -ENODEV;
 998
 999         if (copy_from_user(mode_string, buffer, count))
1000                 return -EFAULT;
1001
1002         mode_string[count] = '\0';
1003
1004         result = acpi_thermal_set_cooling_mode(tz,
1005                                                simple_strtoul(mode_string, NULL,
1006                                                               0));
1007         if (result)
1008                 return result;
1009
1010         acpi_thermal_check(tz);
1011
1012         return count;
1013 }
1014
1015 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1016 {
1017         struct acpi_thermal *tz = seq->private;
1018
1019
1020         if (!tz)
1021                 goto end;
1022
1023         if (!tz->polling_frequency) {
1024                 seq_puts(seq, "<polling disabled>\n");
1025                 goto end;
1026         }
1027
1028         seq_printf(seq, "polling frequency:       %lu seconds\n",
1029                    (tz->polling_frequency / 10));
1030
1031       end:
1032         return 0;
1033 }
1034
1035 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1036 {
1037         return single_open(file, acpi_thermal_polling_seq_show,
1038                            PDE(inode)->data);
1039 }
1040
1041 static ssize_t
1042 acpi_thermal_write_polling(struct file *file,
1043                            const char __user * buffer,
1044                            size_t count, loff_t * ppos)
1045 {
1046         struct seq_file *m = file->private_data;
1047         struct acpi_thermal *tz = m->private;
1048         int result = 0;
1049         char polling_string[12] = { '\0' };
1050         int seconds = 0;
1051
1052
1053         if (!tz || (count > sizeof(polling_string) - 1))
1054                 return -EINVAL;
1055
1056         if (copy_from_user(polling_string, buffer, count))
1057                 return -EFAULT;
1058
1059         polling_string[count] = '\0';
1060
1061         seconds = simple_strtoul(polling_string, NULL, 0);
1062
1063         result = acpi_thermal_set_polling(tz, seconds);
1064         if (result)
1065                 return result;
1066
1067         acpi_thermal_check(tz);
1068
1069         return count;
1070 }
1071
1072 static int acpi_thermal_add_fs(struct acpi_device *device)
1073 {
1074         struct proc_dir_entry *entry = NULL;
1075
1076
1077         if (!acpi_device_dir(device)) {
1078                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1079                                                      acpi_thermal_dir);
1080                 if (!acpi_device_dir(device))
1081                         return -ENODEV;
1082                 acpi_device_dir(device)->owner = THIS_MODULE;
1083         }
1084
1085         /* 'state' [R] */
1086         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1087                                   S_IRUGO, acpi_device_dir(device));
1088         if (!entry)
1089                 return -ENODEV;
1090         else {
1091                 entry->proc_fops = &acpi_thermal_state_fops;
1092                 entry->data = acpi_driver_data(device);
1093                 entry->owner = THIS_MODULE;
1094         }
1095
1096         /* 'temperature' [R] */
1097         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1098                                   S_IRUGO, acpi_device_dir(device));
1099         if (!entry)
1100                 return -ENODEV;
1101         else {
1102                 entry->proc_fops = &acpi_thermal_temp_fops;
1103                 entry->data = acpi_driver_data(device);
1104                 entry->owner = THIS_MODULE;
1105         }
1106
1107         /* 'trip_points' [R] */
1108         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1109                                   S_IRUGO,
1110                                   acpi_device_dir(device));
1111         if (!entry)
1112                 return -ENODEV;
1113         else {
1114                 entry->proc_fops = &acpi_thermal_trip_fops;
1115                 entry->data = acpi_driver_data(device);
1116                 entry->owner = THIS_MODULE;
1117         }
1118
1119         /* 'cooling_mode' [R/W] */
1120         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1121                                   S_IFREG | S_IRUGO | S_IWUSR,
1122                                   acpi_device_dir(device));
1123         if (!entry)
1124                 return -ENODEV;
1125         else {
1126                 entry->proc_fops = &acpi_thermal_cooling_fops;
1127                 entry->data = acpi_driver_data(device);
1128                 entry->owner = THIS_MODULE;
1129         }
1130
1131         /* 'polling_frequency' [R/W] */
1132         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1133                                   S_IFREG | S_IRUGO | S_IWUSR,
1134                                   acpi_device_dir(device));
1135         if (!entry)
1136                 return -ENODEV;
1137         else {
1138                 entry->proc_fops = &acpi_thermal_polling_fops;
1139                 entry->data = acpi_driver_data(device);
1140                 entry->owner = THIS_MODULE;
1141         }
1142
1143         return 0;
1144 }
1145
1146 static int acpi_thermal_remove_fs(struct acpi_device *device)
1147 {
1148
1149         if (acpi_device_dir(device)) {
1150                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1151                                   acpi_device_dir(device));
1152                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1153                                   acpi_device_dir(device));
1154                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1155                                   acpi_device_dir(device));
1156                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1157                                   acpi_device_dir(device));
1158                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1159                                   acpi_device_dir(device));
1160                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1161                 acpi_device_dir(device) = NULL;
1162         }
1163
1164         return 0;
1165 }
1166
1167 /* --------------------------------------------------------------------------
1168                                  Driver Interface
1169    -------------------------------------------------------------------------- */
1170
1171 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1172 {
1173         struct acpi_thermal *tz = data;
1174         struct acpi_device *device = NULL;
1175
1176
1177         if (!tz)
1178                 return;
1179
1180         device = tz->device;
1181
1182         switch (event) {
1183         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1184                 acpi_thermal_check(tz);
1185                 break;
1186         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1187                 acpi_thermal_get_trip_points(tz);
1188                 acpi_thermal_check(tz);
1189                 acpi_bus_generate_proc_event(device, event, 0);
1190                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1191                                                   device->dev.bus_id, event, 0);
1192                 break;
1193         case ACPI_THERMAL_NOTIFY_DEVICES:
1194                 if (tz->flags.devices)
1195                         acpi_thermal_get_devices(tz);
1196                 acpi_bus_generate_proc_event(device, event, 0);
1197                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1198                                                   device->dev.bus_id, event, 0);
1199                 break;
1200         default:
1201                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1202                                   "Unsupported event [0x%x]\n", event));
1203                 break;
1204         }
1205
1206         return;
1207 }
1208
1209 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1210 {
1211         int result = 0;
1212
1213
1214         if (!tz)
1215                 return -EINVAL;
1216
1217         /* Get temperature [_TMP] (required) */
1218         result = acpi_thermal_get_temperature(tz);
1219         if (result)
1220                 return result;
1221
1222         /* Get trip points [_CRT, _PSV, etc.] (required) */
1223         result = acpi_thermal_get_trip_points(tz);
1224         if (result)
1225                 return result;
1226
1227         /* Set the cooling mode [_SCP] to active cooling (default) */
1228         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1229         if (!result)
1230                 tz->flags.cooling_mode = 1;
1231
1232         /* Get default polling frequency [_TZP] (optional) */
1233         if (tzp)
1234                 tz->polling_frequency = tzp;
1235         else
1236                 acpi_thermal_get_polling_frequency(tz);
1237
1238         /* Get devices in this thermal zone [_TZD] (optional) */
1239         result = acpi_thermal_get_devices(tz);
1240         if (!result)
1241                 tz->flags.devices = 1;
1242
1243         return 0;
1244 }
1245
1246 static int acpi_thermal_add(struct acpi_device *device)
1247 {
1248         int result = 0;
1249         acpi_status status = AE_OK;
1250         struct acpi_thermal *tz = NULL;
1251
1252
1253         if (!device)
1254                 return -EINVAL;
1255
1256         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1257         if (!tz)
1258                 return -ENOMEM;
1259
1260         tz->device = device;
1261         strcpy(tz->name, device->pnp.bus_id);
1262         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1263         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1264         acpi_driver_data(device) = tz;
1265         mutex_init(&tz->lock);
1266         result = acpi_thermal_get_info(tz);
1267         if (result)
1268                 goto end;
1269
1270         result = acpi_thermal_add_fs(device);
1271         if (result)
1272                 goto end;
1273
1274         init_timer(&tz->timer);
1275
1276         acpi_thermal_check(tz);
1277
1278         status = acpi_install_notify_handler(device->handle,
1279                                              ACPI_DEVICE_NOTIFY,
1280                                              acpi_thermal_notify, tz);
1281         if (ACPI_FAILURE(status)) {
1282                 result = -ENODEV;
1283                 goto end;
1284         }
1285
1286         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1287                acpi_device_name(device), acpi_device_bid(device),
1288                KELVIN_TO_CELSIUS(tz->temperature));
1289
1290       end:
1291         if (result) {
1292                 acpi_thermal_remove_fs(device);
1293                 kfree(tz);
1294         }
1295
1296         return result;
1297 }
1298
1299 static int acpi_thermal_remove(struct acpi_device *device, int type)
1300 {
1301         acpi_status status = AE_OK;
1302         struct acpi_thermal *tz = NULL;
1303
1304
1305         if (!device || !acpi_driver_data(device))
1306                 return -EINVAL;
1307
1308         tz = acpi_driver_data(device);
1309
1310         /* avoid timer adding new defer task */
1311         tz->zombie = 1;
1312         /* wait for running timer (on other CPUs) finish */
1313         del_timer_sync(&(tz->timer));
1314         /* synchronize deferred task */
1315         acpi_os_wait_events_complete(NULL);
1316         /* deferred task may reinsert timer */
1317         del_timer_sync(&(tz->timer));
1318
1319         status = acpi_remove_notify_handler(device->handle,
1320                                             ACPI_DEVICE_NOTIFY,
1321                                             acpi_thermal_notify);
1322
1323         /* Terminate policy */
1324         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1325                 tz->trips.passive.flags.enabled = 0;
1326                 acpi_thermal_passive(tz);
1327         }
1328         if (tz->trips.active[0].flags.valid
1329             && tz->trips.active[0].flags.enabled) {
1330                 tz->trips.active[0].flags.enabled = 0;
1331                 acpi_thermal_active(tz);
1332         }
1333
1334         acpi_thermal_remove_fs(device);
1335         mutex_destroy(&tz->lock);
1336         kfree(tz);
1337         return 0;
1338 }
1339
1340 static int acpi_thermal_resume(struct acpi_device *device)
1341 {
1342         struct acpi_thermal *tz = NULL;
1343         int i, j, power_state, result;
1344
1345
1346         if (!device || !acpi_driver_data(device))
1347                 return -EINVAL;
1348
1349         tz = acpi_driver_data(device);
1350
1351         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1352                 if (!(&tz->trips.active[i]))
1353                         break;
1354                 if (!tz->trips.active[i].flags.valid)
1355                         break;
1356                 tz->trips.active[i].flags.enabled = 1;
1357                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1358                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1359                             handles[j], &power_state);
1360                         if (result || (power_state != ACPI_STATE_D0)) {
1361                                 tz->trips.active[i].flags.enabled = 0;
1362                                 break;
1363                         }
1364                 }
1365                 tz->state.active |= tz->trips.active[i].flags.enabled;
1366         }
1367
1368         acpi_thermal_check(tz);
1369
1370         return AE_OK;
1371 }
1372
1373 #ifdef CONFIG_DMI
1374 static int thermal_act(const struct dmi_system_id *d) {
1375
1376         if (act == 0) {
1377                 printk(KERN_NOTICE "ACPI: %s detected: "
1378                         "disabling all active thermal trip points\n", d->ident);
1379                 act = -1;
1380         }
1381         return 0;
1382 }
1383 static int thermal_nocrt(const struct dmi_system_id *d) {
1384
1385         printk(KERN_NOTICE "ACPI: %s detected: "
1386                 "disabling all critical thermal trip point actions.\n", d->ident);
1387         nocrt = 1;
1388         return 0;
1389 }
1390 static int thermal_tzp(const struct dmi_system_id *d) {
1391
1392         if (tzp == 0) {
1393                 printk(KERN_NOTICE "ACPI: %s detected: "
1394                         "enabling thermal zone polling\n", d->ident);
1395                 tzp = 300;      /* 300 dS = 30 Seconds */
1396         }
1397         return 0;
1398 }
1399 static int thermal_psv(const struct dmi_system_id *d) {
1400
1401         if (psv == 0) {
1402                 printk(KERN_NOTICE "ACPI: %s detected: "
1403                         "disabling all passive thermal trip points\n", d->ident);
1404                 psv = -1;
1405         }
1406         return 0;
1407 }
1408
1409 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1410         /*
1411          * Award BIOS on this AOpen makes thermal control almost worthless.
1412          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1413          */
1414         {
1415          .callback = thermal_act,
1416          .ident = "AOpen i915GMm-HFS",
1417          .matches = {
1418                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1419                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1420                 },
1421         },
1422         {
1423          .callback = thermal_psv,
1424          .ident = "AOpen i915GMm-HFS",
1425          .matches = {
1426                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1427                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1428                 },
1429         },
1430         {
1431          .callback = thermal_tzp,
1432          .ident = "AOpen i915GMm-HFS",
1433          .matches = {
1434                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1435                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1436                 },
1437         },
1438         {
1439          .callback = thermal_nocrt,
1440          .ident = "Gigabyte GA-7ZX",
1441          .matches = {
1442                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1443                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1444                 },
1445         },
1446         {}
1447 };
1448 #endif /* CONFIG_DMI */
1449
1450 static int __init acpi_thermal_init(void)
1451 {
1452         int result = 0;
1453
1454         dmi_check_system(thermal_dmi_table);
1455
1456         if (off) {
1457                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1458                 return -ENODEV;
1459         }
1460         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1461         if (!acpi_thermal_dir)
1462                 return -ENODEV;
1463         acpi_thermal_dir->owner = THIS_MODULE;
1464
1465         result = acpi_bus_register_driver(&acpi_thermal_driver);
1466         if (result < 0) {
1467                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1468                 return -ENODEV;
1469         }
1470
1471         return 0;
1472 }
1473
1474 static void __exit acpi_thermal_exit(void)
1475 {
1476
1477         acpi_bus_unregister_driver(&acpi_thermal_driver);
1478
1479         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1480
1481         return;
1482 }
1483
1484 module_init(acpi_thermal_init);
1485 module_exit(acpi_thermal_exit);