drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/sched.h>
  40 #include <linux/kmod.h>
  41 #include <linux/seq_file.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_THERMAL_COMPONENT          0x04000000
  48 #define ACPI_THERMAL_CLASS              "thermal_zone"
  49 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
  50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  51 #define ACPI_THERMAL_FILE_STATE         "state"
  52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  63 #define ACPI_THERMAL_MODE_CRT           0xff
  64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  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                ("acpi_thermal")
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  76 MODULE_LICENSE("GPL");
  77
  78 static int tzp;
  79 MODULE_PARM(tzp, "i");
  80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  81
  82
  83 static int acpi_thermal_add (struct acpi_device *device);
  84 static int acpi_thermal_remove (struct acpi_device *device, int type);
  85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_trip_points (struct file*,const char __user *,size_t,loff_t *);
  89 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  90 static ssize_t acpi_thermal_write_cooling_mode (struct file*,const char __user *,size_t,loff_t *);
  91 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  92 static ssize_t acpi_thermal_write_polling(struct file*,const char __user *,size_t,loff_t *);
  93
  94 static struct acpi_driver acpi_thermal_driver = {
  95         .name =         ACPI_THERMAL_DRIVER_NAME,
  96         .class =        ACPI_THERMAL_CLASS,
  97         .ids =          ACPI_THERMAL_HID,
  98         .ops =          {
  99                                 .add =          acpi_thermal_add,
 100                                 .remove =       acpi_thermal_remove,
 101                         },
 102 };
 103
 104 struct acpi_thermal_state {
 105         u8                      critical:1;
 106         u8                      hot:1;
 107         u8                      passive:1;
 108         u8                      active:1;
 109         u8                      reserved:4;
 110         int                     active_index;
 111 };
 112
 113 struct acpi_thermal_state_flags {
 114         u8                      valid:1;
 115         u8                      enabled:1;
 116         u8                      reserved:6;
 117 };
 118
 119 struct acpi_thermal_critical {
 120         struct acpi_thermal_state_flags flags;
 121         unsigned long           temperature;
 122 };
 123
 124 struct acpi_thermal_hot {
 125         struct acpi_thermal_state_flags flags;
 126         unsigned long           temperature;
 127 };
 128
 129 struct acpi_thermal_passive {
 130         struct acpi_thermal_state_flags flags;
 131         unsigned long           temperature;
 132         unsigned long           tc1;
 133         unsigned long           tc2;
 134         unsigned long           tsp;
 135         struct acpi_handle_list devices;
 136 };
 137
 138 struct acpi_thermal_active {
 139         struct acpi_thermal_state_flags flags;
 140         unsigned long           temperature;
 141         struct acpi_handle_list devices;
 142 };
 143
 144 struct acpi_thermal_trips {
 145         struct acpi_thermal_critical critical;
 146         struct acpi_thermal_hot hot;
 147         struct acpi_thermal_passive passive;
 148         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 149 };
 150
 151 struct acpi_thermal_flags {
 152         u8                      cooling_mode:1;         /* _SCP */
 153         u8                      devices:1;              /* _TZD */
 154         u8                      reserved:6;
 155 };
 156
 157 struct acpi_thermal {
 158         acpi_handle             handle;
 159         acpi_bus_id             name;
 160         unsigned long           temperature;
 161         unsigned long           last_temperature;
 162         unsigned long           polling_frequency;
 163         u8                      cooling_mode;
 164         volatile u8             zombie;
 165         struct acpi_thermal_flags flags;
 166         struct acpi_thermal_state state;
 167         struct acpi_thermal_trips trips;
 168         struct acpi_handle_list devices;
 169         struct timer_list       timer;
 170 };
 171
 172 static struct file_operations acpi_thermal_state_fops = {
 173         .open           = acpi_thermal_state_open_fs,
 174         .read           = seq_read,
 175         .llseek         = seq_lseek,
 176         .release        = single_release,
 177 };
 178
 179 static struct file_operations acpi_thermal_temp_fops = {
 180         .open           = acpi_thermal_temp_open_fs,
 181         .read           = seq_read,
 182         .llseek         = seq_lseek,
 183         .release        = single_release,
 184 };
 185
 186 static struct file_operations acpi_thermal_trip_fops = {
 187         .open           = acpi_thermal_trip_open_fs,
 188         .read           = seq_read,
 189         .write          = acpi_thermal_write_trip_points,
 190         .llseek         = seq_lseek,
 191         .release        = single_release,
 192 };
 193
 194 static struct file_operations acpi_thermal_cooling_fops = {
 195         .open           = acpi_thermal_cooling_open_fs,
 196         .read           = seq_read,
 197         .write          = acpi_thermal_write_cooling_mode,
 198         .llseek         = seq_lseek,
 199         .release        = single_release,
 200 };
 201
 202 static struct file_operations acpi_thermal_polling_fops = {
 203         .open           = acpi_thermal_polling_open_fs,
 204         .read           = seq_read,
 205         .write          = acpi_thermal_write_polling,
 206         .llseek         = seq_lseek,
 207         .release        = single_release,
 208 };
 209
 210 /* --------------------------------------------------------------------------
 211                              Thermal Zone Management
 212    -------------------------------------------------------------------------- */
 213
 214 static int
 215 acpi_thermal_get_temperature (
 216         struct acpi_thermal *tz)
 217 {
 218         acpi_status             status = AE_OK;
 219
 220         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 221
 222         if (!tz)
 223                 return_VALUE(-EINVAL);
 224
 225         tz->last_temperature = tz->temperature;
 226
 227         status = acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 228         if (ACPI_FAILURE(status))
 229                 return -ENODEV;
 230
 231         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", tz->temperature));
 232
 233         return_VALUE(0);
 234 }
 235
 236
 237 static int
 238 acpi_thermal_get_polling_frequency (
 239         struct acpi_thermal     *tz)
 240 {
 241         acpi_status             status = AE_OK;
 242
 243         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 244
 245         if (!tz)
 246                 return_VALUE(-EINVAL);
 247
 248         status = acpi_evaluate_integer(tz->handle, "_TZP", NULL, &tz->polling_frequency);
 249         if (ACPI_FAILURE(status))
 250                 return_VALUE(-ENODEV);
 251
 252         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", tz->polling_frequency));
 253
 254         return_VALUE(0);
 255 }
 256
 257
 258 static int
 259 acpi_thermal_set_polling (
 260         struct acpi_thermal     *tz,
 261         int                     seconds)
 262 {
 263         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 264
 265         if (!tz)
 266                 return_VALUE(-EINVAL);
 267
 268         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 269
 270         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency set to %lu seconds\n", tz->polling_frequency));
 271
 272         return_VALUE(0);
 273 }
 274
 275
 276 static int
 277 acpi_thermal_set_cooling_mode (
 278         struct acpi_thermal     *tz,
 279         int                     mode)
 280 {
 281         acpi_status             status = AE_OK;
 282         union acpi_object       arg0 = {ACPI_TYPE_INTEGER};
 283         struct acpi_object_list arg_list = {1, &arg0};
 284         acpi_handle             handle = NULL;
 285
 286         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 287
 288         if (!tz)
 289                 return_VALUE(-EINVAL);
 290
 291         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 292         if (ACPI_FAILURE(status)) {
 293                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 294                 return_VALUE(-ENODEV);
 295         }
 296
 297         arg0.integer.value = mode;
 298
 299         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 300         if (ACPI_FAILURE(status))
 301                 return_VALUE(-ENODEV);
 302
 303         tz->cooling_mode = mode;
 304
 305         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 306                 mode?"passive":"active"));
 307
 308         return_VALUE(0);
 309 }
 310
 311
 312 static int
 313 acpi_thermal_get_trip_points (
 314         struct acpi_thermal *tz)
 315 {
 316         acpi_status             status = AE_OK;
 317         int                     i = 0;
 318
 319         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 320
 321         if (!tz)
 322                 return_VALUE(-EINVAL);
 323
 324         /* Critical Shutdown (required) */
 325
 326         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 327                 &tz->trips.critical.temperature);
 328         if (ACPI_FAILURE(status)) {
 329                 tz->trips.critical.flags.valid = 0;
 330                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 331                 return -ENODEV;
 332         }
 333         else {
 334                 tz->trips.critical.flags.valid = 1;
 335                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found critical threshold [%lu]\n", tz->trips.critical.temperature));
 336         }
 337
 338         /* Critical Sleep (optional) */
 339
 340         status = acpi_evaluate_integer(tz->handle, "_HOT", NULL, &tz->trips.hot.temperature);
 341         if (ACPI_FAILURE(status)) {
 342                 tz->trips.hot.flags.valid = 0;
 343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 344         }
 345         else {
 346                 tz->trips.hot.flags.valid = 1;
 347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", tz->trips.hot.temperature));
 348         }
 349
 350         /* Passive: Processors (optional) */
 351
 352         status = acpi_evaluate_integer(tz->handle, "_PSV", NULL, &tz->trips.passive.temperature);
 353         if (ACPI_FAILURE(status)) {
 354                 tz->trips.passive.flags.valid = 0;
 355                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 356         }
 357         else {
 358                 tz->trips.passive.flags.valid = 1;
 359
 360                 status = acpi_evaluate_integer(tz->handle, "_TC1", NULL, &tz->trips.passive.tc1);
 361                 if (ACPI_FAILURE(status))
 362                         tz->trips.passive.flags.valid = 0;
 363
 364                 status = acpi_evaluate_integer(tz->handle, "_TC2", NULL, &tz->trips.passive.tc2);
 365                 if (ACPI_FAILURE(status))
 366                         tz->trips.passive.flags.valid = 0;
 367
 368                 status = acpi_evaluate_integer(tz->handle, "_TSP", NULL, &tz->trips.passive.tsp);
 369                 if (ACPI_FAILURE(status))
 370                         tz->trips.passive.flags.valid = 0;
 371
 372                 status = acpi_evaluate_reference(tz->handle, "_PSL", NULL, &tz->trips.passive.devices);
 373                 if (ACPI_FAILURE(status))
 374                         tz->trips.passive.flags.valid = 0;
 375
 376                 if (!tz->trips.passive.flags.valid)
 377                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid passive threshold\n"));
 378                 else
 379                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found passive threshold [%lu]\n", tz->trips.passive.temperature));
 380         }
 381
 382         /* Active: Fans, etc. (optional) */
 383
 384         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 385
 386                 char name[5] = {'_','A','C',('0'+i),'\0'};
 387
 388                 status = acpi_evaluate_integer(tz->handle, name, NULL, &tz->trips.active[i].temperature);
 389                 if (ACPI_FAILURE(status))
 390                         break;
 391
 392                 name[2] = 'L';
 393                 status = acpi_evaluate_reference(tz->handle, name, NULL, &tz->trips.active[i].devices);
 394                 if (ACPI_SUCCESS(status)) {
 395                         tz->trips.active[i].flags.valid = 1;
 396                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found active threshold [%d]:[%lu]\n", i, tz->trips.active[i].temperature));
 397                 }
 398                 else
 399                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid active threshold [%d]\n", i));
 400         }
 401
 402         return_VALUE(0);
 403 }
 404
 405
 406 static int
 407 acpi_thermal_get_devices (
 408         struct acpi_thermal     *tz)
 409 {
 410         acpi_status             status = AE_OK;
 411
 412         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 413
 414         if (!tz)
 415                 return_VALUE(-EINVAL);
 416
 417         status = acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 418         if (ACPI_FAILURE(status))
 419                 return_VALUE(-ENODEV);
 420
 421         return_VALUE(0);
 422 }
 423
 424
 425 static int
 426 acpi_thermal_call_usermode (
 427         char                    *path)
 428 {
 429         char                    *argv[2] = {NULL, NULL};
 430         char                    *envp[3] = {NULL, NULL, NULL};
 431
 432         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 433
 434         if (!path)
 435                 return_VALUE(-EINVAL);
 436
 437         argv[0] = path;
 438
 439         /* minimal command environment */
 440         envp[0] = "HOME=/";
 441         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 442
 443         call_usermodehelper(argv[0], argv, envp, 0);
 444
 445         return_VALUE(0);
 446 }
 447
 448
 449 static int
 450 acpi_thermal_critical (
 451         struct acpi_thermal     *tz)
 452 {
 453         int                     result = 0;
 454         struct acpi_device      *device = NULL;
 455
 456         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 457
 458         if (!tz || !tz->trips.critical.flags.valid)
 459                 return_VALUE(-EINVAL);
 460
 461         if (tz->temperature >= tz->trips.critical.temperature) {
 462                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 463                 tz->trips.critical.flags.enabled = 1;
 464         }
 465         else if (tz->trips.critical.flags.enabled)
 466                 tz->trips.critical.flags.enabled = 0;
 467
 468         result = acpi_bus_get_device(tz->handle, &device);
 469         if (result)
 470                 return_VALUE(result);
 471
 472         printk(KERN_EMERG "Critical temperature reached (%ld C), shutting down.\n", KELVIN_TO_CELSIUS(tz->temperature));
 473         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL, tz->trips.critical.flags.enabled);
 474
 475         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 476
 477         return_VALUE(0);
 478 }
 479
 480
 481 static int
 482 acpi_thermal_hot (
 483         struct acpi_thermal     *tz)
 484 {
 485         int                     result = 0;
 486         struct acpi_device      *device = NULL;
 487
 488         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 489
 490         if (!tz || !tz->trips.hot.flags.valid)
 491                 return_VALUE(-EINVAL);
 492
 493         if (tz->temperature >= tz->trips.hot.temperature) {
 494                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 495                 tz->trips.hot.flags.enabled = 1;
 496         }
 497         else if (tz->trips.hot.flags.enabled)
 498                 tz->trips.hot.flags.enabled = 0;
 499
 500         result = acpi_bus_get_device(tz->handle, &device);
 501         if (result)
 502                 return_VALUE(result);
 503
 504         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT, tz->trips.hot.flags.enabled);
 505
 506         /* TBD: Call user-mode "sleep(S4)" function */
 507
 508         return_VALUE(0);
 509 }
 510
 511
 512 static int
 513 acpi_thermal_passive (
 514         struct acpi_thermal     *tz)
 515 {
 516         int                     result = 0;
 517         struct acpi_thermal_passive *passive = NULL;
 518         int                     trend = 0;
 519         int                     i = 0;
 520
 521         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 522
 523         if (!tz || !tz->trips.passive.flags.valid)
 524                 return_VALUE(-EINVAL);
 525
 526         passive = &(tz->trips.passive);
 527
 528         /*
 529          * Above Trip?
 530          * -----------
 531          * Calculate the thermal trend (using the passive cooling equation)
 532          * and modify the performance limit for all passive cooling devices
 533          * accordingly.  Note that we assume symmetry.
 534          */
 535         if (tz->temperature >= passive->temperature) {
 536                 trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature));
 537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 538                         "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 539                         trend, passive->tc1, tz->temperature,
 540                         tz->last_temperature, passive->tc2,
 541                         tz->temperature, passive->temperature));
 542                 tz->trips.passive.flags.enabled = 1;
 543                 /* Heating up? */
 544                 if (trend > 0)
 545                         for (i=0; i<passive->devices.count; i++)
 546                                 acpi_processor_set_thermal_limit(
 547                                         passive->devices.handles[i],
 548                                         ACPI_PROCESSOR_LIMIT_INCREMENT);
 549                 /* Cooling off? */
 550                 else if (trend < 0)
 551                         for (i=0; i<passive->devices.count; i++)
 552                                 acpi_processor_set_thermal_limit(
 553                                         passive->devices.handles[i],
 554                                         ACPI_PROCESSOR_LIMIT_DECREMENT);
 555         }
 556
 557         /*
 558          * Below Trip?
 559          * -----------
 560          * Implement passive cooling hysteresis to slowly increase performance
 561          * and avoid thrashing around the passive trip point.  Note that we
 562          * assume symmetry.
 563          */
 564         else if (tz->trips.passive.flags.enabled) {
 565                 for (i=0; i<passive->devices.count; i++)
 566                         result = acpi_processor_set_thermal_limit(
 567                                 passive->devices.handles[i],
 568                                 ACPI_PROCESSOR_LIMIT_DECREMENT);
 569                 if (result == 1) {
 570                         tz->trips.passive.flags.enabled = 0;
 571                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 572                                 "Disabling passive cooling (zone is cool)\n"));
 573                 }
 574         }
 575
 576         return_VALUE(0);
 577 }
 578
 579
 580 static int
 581 acpi_thermal_active (
 582         struct acpi_thermal     *tz)
 583 {
 584         int                     result = 0;
 585         struct acpi_thermal_active *active = NULL;
 586         int                     i = 0;
 587         int                     j = 0;
 588         unsigned long           maxtemp = 0;
 589
 590         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 591
 592         if (!tz)
 593                 return_VALUE(-EINVAL);
 594
 595         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) {
 596
 597                 active = &(tz->trips.active[i]);
 598                 if (!active || !active->flags.valid)
 599                         break;
 600
 601                 /*
 602                  * Above Threshold?
 603                  * ----------------
 604                  * If not already enabled, turn ON all cooling devices
 605                  * associated with this active threshold.
 606                  */
 607                 if (tz->temperature >= active->temperature) {
 608                         if (active->temperature > maxtemp)
 609                                 tz->state.active_index = i, maxtemp = active->temperature;
 610                         if (!active->flags.enabled) {
 611                                 for (j = 0; j < active->devices.count; j++) {
 612                                         result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D0);
 613                                         if (result) {
 614                                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'on'\n", active->devices.handles[j]));
 615                                                 continue;
 616                                         }
 617                                         active->flags.enabled = 1;
 618                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'on'\n", active->devices.handles[j]));
 619                                 }
 620                         }
 621                 }
 622                 /*
 623                  * Below Threshold?
 624                  * ----------------
 625                  * Turn OFF all cooling devices associated with this
 626                  * threshold.
 627                  */
 628                 else if (active->flags.enabled) {
 629                         for (j = 0; j < active->devices.count; j++) {
 630                                 result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D3);
 631                                 if (result) {
 632                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'off'\n", active->devices.handles[j]));
 633                                         continue;
 634                                 }
 635                                 active->flags.enabled = 0;
 636                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'off'\n", active->devices.handles[j]));
 637                         }
 638                 }
 639         }
 640
 641         return_VALUE(0);
 642 }
 643
 644
 645 static void acpi_thermal_check (void *context);
 646
 647 static void
 648 acpi_thermal_run (
 649         unsigned long           data)
 650 {
 651         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 652         if (!tz->zombie)
 653                 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 654                         acpi_thermal_check, (void *) data);
 655 }
 656
 657
 658 static void
 659 acpi_thermal_check (
 660         void                    *data)
 661 {
 662         int                     result = 0;
 663         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
 664         unsigned long           sleep_time = 0;
 665         int                     i = 0;
 666         struct acpi_thermal_state state;
 667
 668         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 669
 670         if (!tz) {
 671                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 672                 return_VOID;
 673         }
 674
 675         state = tz->state;
 676
 677         result = acpi_thermal_get_temperature(tz);
 678         if (result)
 679                 return_VOID;
 680
 681         memset(&tz->state, 0, sizeof(tz->state));
 682
 683         /*
 684          * Check Trip Points
 685          * -----------------
 686          * Compare the current temperature to the trip point values to see
 687          * if we've entered one of the thermal policy states.  Note that
 688          * this function determines when a state is entered, but the
 689          * individual policy decides when it is exited (e.g. hysteresis).
 690          */
 691         if (tz->trips.critical.flags.valid)
 692                 state.critical |= (tz->temperature >= tz->trips.critical.temperature);
 693         if (tz->trips.hot.flags.valid)
 694                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 695         if (tz->trips.passive.flags.valid)
 696                 state.passive |= (tz->temperature >= tz->trips.passive.temperature);
 697         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 698                 if (tz->trips.active[i].flags.valid)
 699                         state.active |= (tz->temperature >= tz->trips.active[i].temperature);
 700
 701         /*
 702          * Invoke Policy
 703          * -------------
 704          * Separated from the above check to allow individual policy to
 705          * determine when to exit a given state.
 706          */
 707         if (state.critical)
 708                 acpi_thermal_critical(tz);
 709         if (state.hot)
 710                 acpi_thermal_hot(tz);
 711         if (state.passive)
 712                 acpi_thermal_passive(tz);
 713         if (state.active)
 714                 acpi_thermal_active(tz);
 715
 716         /*
 717          * Calculate State
 718          * ---------------
 719          * Again, separated from the above two to allow independent policy
 720          * decisions.
 721          */
 722         if (tz->trips.critical.flags.enabled)
 723                 tz->state.critical = 1;
 724         if (tz->trips.hot.flags.enabled)
 725                 tz->state.hot = 1;
 726         if (tz->trips.passive.flags.enabled)
 727                 tz->state.passive = 1;
 728         for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++)
 729                 if (tz->trips.active[i].flags.enabled)
 730                         tz->state.active = 1;
 731
 732         /*
 733          * Calculate Sleep Time
 734          * --------------------
 735          * If we're in the passive state, use _TSP's value.  Otherwise
 736          * use the default polling frequency (e.g. _TZP).  If no polling
 737          * frequency is specified then we'll wait forever (at least until
 738          * a thermal event occurs).  Note that _TSP and _TZD values are
 739          * given in 1/10th seconds (we must covert to milliseconds).
 740          */
 741         if (tz->state.passive)
 742                 sleep_time = tz->trips.passive.tsp * 100;
 743         else if (tz->polling_frequency > 0)
 744                 sleep_time = tz->polling_frequency * 100;
 745
 746         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 747                 tz->name, tz->temperature, sleep_time));
 748
 749         /*
 750          * Schedule Next Poll
 751          * ------------------
 752          */
 753         if (!sleep_time) {
 754                 if (timer_pending(&(tz->timer)))
 755                         del_timer(&(tz->timer));
 756         }
 757         else {
 758                 if (timer_pending(&(tz->timer)))
 759                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 760                 else {
 761                         tz->timer.data = (unsigned long) tz;
 762                         tz->timer.function = acpi_thermal_run;
 763                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 764                         add_timer(&(tz->timer));
 765                 }
 766         }
 767
 768         return_VOID;
 769 }
 770
 771
 772 /* --------------------------------------------------------------------------
 773                               FS Interface (/proc)
 774    -------------------------------------------------------------------------- */
 775
 776 struct proc_dir_entry           *acpi_thermal_dir;
 777
 778 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 779 {
 780         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 781
 782         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 783
 784         if (!tz)
 785                 goto end;
 786
 787         seq_puts(seq, "state:                   ");
 788
 789         if (!tz->state.critical && !tz->state.hot && !tz->state.passive && !tz->state.active)
 790                 seq_puts(seq, "ok\n");
 791         else {
 792                 if (tz->state.critical)
 793                         seq_puts(seq, "critical ");
 794                 if (tz->state.hot)
 795                         seq_puts(seq, "hot ");
 796                 if (tz->state.passive)
 797                         seq_puts(seq, "passive ");
 798                 if (tz->state.active)
 799                         seq_printf(seq, "active[%d]", tz->state.active_index);
 800                 seq_puts(seq, "\n");
 801         }
 802
 803 end:
 804         return 0;
 805 }
 806
 807 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 808 {
 809         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 810 }
 811
 812
 813 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 814 {
 815         int                     result = 0;
 816         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 817
 818         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 819
 820         if (!tz)
 821                 goto end;
 822
 823         result = acpi_thermal_get_temperature(tz);
 824         if (result)
 825                 goto end;
 826
 827         seq_printf(seq, "temperature:             %ld C\n",
 828                 KELVIN_TO_CELSIUS(tz->temperature));
 829
 830 end:
 831         return 0;
 832 }
 833
 834 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 835 {
 836         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 837 }
 838
 839
 840 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 841 {
 842         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 843         int                     i = 0;
 844         int                     j = 0;
 845
 846         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 847
 848         if (!tz)
 849                 goto end;
 850
 851         if (tz->trips.critical.flags.valid)
 852                 seq_printf(seq, "critical (S5):           %ld C\n",
 853                         KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 854
 855         if (tz->trips.hot.flags.valid)
 856                 seq_printf(seq, "hot (S4):                %ld C\n",
 857                         KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 858
 859         if (tz->trips.passive.flags.valid) {
 860                 seq_printf(seq, "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 861                         KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 862                         tz->trips.passive.tc1,
 863                         tz->trips.passive.tc2,
 864                         tz->trips.passive.tsp);
 865                 for (j=0; j<tz->trips.passive.devices.count; j++) {
 866
 867                         seq_printf(seq, "0x%p ", tz->trips.passive.devices.handles[j]);
 868                 }
 869                 seq_puts(seq, "\n");
 870         }
 871
 872         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 873                 if (!(tz->trips.active[i].flags.valid))
 874                         break;
 875                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 876                         i, KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 877                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 878                         seq_printf(seq, "0x%p ",
 879                                 tz->trips.active[i].devices.handles[j]);
 880                 seq_puts(seq, "\n");
 881         }
 882
 883 end:
 884         return 0;
 885 }
 886
 887 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 888 {
 889         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 890 }
 891
 892 static ssize_t
 893 acpi_thermal_write_trip_points (
 894         struct file             *file,
 895         const char              __user *buffer,
 896         size_t                  count,
 897         loff_t                  *ppos)
 898 {
 899         struct seq_file         *m = (struct seq_file *)file->private_data;
 900         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
 901
 902         char                    limit_string[65] = {'\0'};
 903         int                     num, critical, hot, passive;
 904         int                     active[ACPI_THERMAL_MAX_ACTIVE];
 905         int                     i = 0;
 906
 907         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 908
 909         if (!tz || (count > sizeof(limit_string) - 1)) {
 910                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 911                 return_VALUE(-EINVAL);
 912         }
 913
 914         if (copy_from_user(limit_string, buffer, count)) {
 915                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 916                 return_VALUE(-EFAULT);
 917         }
 918
 919         limit_string[count] = '\0';
 920
 921         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 922                                 &critical, &hot, &passive,
 923                                 &active[0], &active[1], &active[2], &active[3], &active[4],
 924                                 &active[5], &active[6], &active[7], &active[8], &active[9]);
 925         if(!(num >=5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 926                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 927                 return_VALUE(-EINVAL);
 928         }
 929
 930         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 931         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 932         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 933         for (i = 0; i < num - 3; i++) {
 934                 if (!(tz->trips.active[i].flags.valid))
 935                         break;
 936                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 937         }
 938
 939         return_VALUE(count);
 940 }
 941
 942
 943 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 944 {
 945         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
 946
 947         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 948
 949         if (!tz)
 950                 goto end;
 951
 952         if (!tz->flags.cooling_mode) {
 953                 seq_puts(seq, "<setting not supported>\n");
 954         }
 955
 956         if ( tz->cooling_mode == ACPI_THERMAL_MODE_CRT )
 957                 seq_printf(seq, "cooling mode:  critical\n");
 958         else
 959                 seq_printf(seq, "cooling mode:  %s\n",
 960                         tz->cooling_mode?"passive":"active");
 961
 962 end:
 963         return 0;
 964 }
 965
 966 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 967 {
 968         return single_open(file, acpi_thermal_cooling_seq_show,
 969                                                         PDE(inode)->data);
 970 }
 971
 972 static ssize_t
 973 acpi_thermal_write_cooling_mode (
 974         struct file             *file,
 975         const char              __user *buffer,
 976         size_t                  count,
 977         loff_t                  *ppos)
 978 {
 979         struct seq_file         *m = (struct seq_file *)file->private_data;
 980         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
 981         int                     result = 0;
 982         char                    mode_string[12] = {'\0'};
 983
 984         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
 985
 986         if (!tz || (count > sizeof(mode_string) - 1))
 987                 return_VALUE(-EINVAL);
 988
 989         if (!tz->flags.cooling_mode)
 990                 return_VALUE(-ENODEV);
 991
 992         if (copy_from_user(mode_string, buffer, count))
 993                 return_VALUE(-EFAULT);
 994
 995         mode_string[count] = '\0';
 996
 997         result = acpi_thermal_set_cooling_mode(tz,
 998                 simple_strtoul(mode_string, NULL, 0));
 999         if (result)
1000                 return_VALUE(result);
1001
1002         acpi_thermal_check(tz);
1003
1004         return_VALUE(count);
1005 }
1006
1007
1008 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1009 {
1010         struct acpi_thermal     *tz = (struct acpi_thermal *)seq->private;
1011
1012         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1013
1014         if (!tz)
1015                 goto end;
1016
1017         if (!tz->polling_frequency) {
1018                 seq_puts(seq, "<polling disabled>\n");
1019                 goto end;
1020         }
1021
1022         seq_printf(seq, "polling frequency:       %lu seconds\n",
1023                 (tz->polling_frequency / 10));
1024
1025 end:
1026         return 0;
1027 }
1028
1029 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1030 {
1031         return single_open(file, acpi_thermal_polling_seq_show,
1032                                                         PDE(inode)->data);
1033 }
1034
1035 static ssize_t
1036 acpi_thermal_write_polling (
1037         struct file             *file,
1038         const char              __user *buffer,
1039         size_t                  count,
1040         loff_t                  *ppos)
1041 {
1042         struct seq_file         *m = (struct seq_file *)file->private_data;
1043         struct acpi_thermal     *tz = (struct acpi_thermal *)m->private;
1044         int                     result = 0;
1045         char                    polling_string[12] = {'\0'};
1046         int                     seconds = 0;
1047
1048         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1049
1050         if (!tz || (count > sizeof(polling_string) - 1))
1051                 return_VALUE(-EINVAL);
1052
1053         if (copy_from_user(polling_string, buffer, count))
1054                 return_VALUE(-EFAULT);
1055
1056         polling_string[count] = '\0';
1057
1058         seconds = simple_strtoul(polling_string, NULL, 0);
1059
1060         result = acpi_thermal_set_polling(tz, seconds);
1061         if (result)
1062                 return_VALUE(result);
1063
1064         acpi_thermal_check(tz);
1065
1066         return_VALUE(count);
1067 }
1068
1069
1070 static int
1071 acpi_thermal_add_fs (
1072         struct acpi_device      *device)
1073 {
1074         struct proc_dir_entry   *entry = NULL;
1075
1076         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1077
1078         if (!acpi_device_dir(device)) {
1079                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1080                         acpi_thermal_dir);
1081                 if (!acpi_device_dir(device))
1082                         return_VALUE(-ENODEV);
1083                 acpi_device_dir(device)->owner = THIS_MODULE;
1084         }
1085
1086         /* 'state' [R] */
1087         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1088                 S_IRUGO, acpi_device_dir(device));
1089         if (!entry)
1090                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1091                         "Unable to create '%s' fs entry\n",
1092                         ACPI_THERMAL_FILE_STATE));
1093         else {
1094                 entry->proc_fops = &acpi_thermal_state_fops;
1095                 entry->data = acpi_driver_data(device);
1096                 entry->owner = THIS_MODULE;
1097         }
1098
1099         /* 'temperature' [R] */
1100         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1101                 S_IRUGO, acpi_device_dir(device));
1102         if (!entry)
1103                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1104                         "Unable to create '%s' fs entry\n",
1105                         ACPI_THERMAL_FILE_TEMPERATURE));
1106         else {
1107                 entry->proc_fops = &acpi_thermal_temp_fops;
1108                 entry->data = acpi_driver_data(device);
1109                 entry->owner = THIS_MODULE;
1110         }
1111
1112         /* 'trip_points' [R/W] */
1113         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1114                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1115         if (!entry)
1116                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1117                         "Unable to create '%s' fs entry\n",
1118                         ACPI_THERMAL_FILE_TRIP_POINTS));
1119         else {
1120                 entry->proc_fops = &acpi_thermal_trip_fops;
1121                 entry->data = acpi_driver_data(device);
1122                 entry->owner = THIS_MODULE;
1123         }
1124
1125         /* 'cooling_mode' [R/W] */
1126         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1127                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1128         if (!entry)
1129                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1130                         "Unable to create '%s' fs entry\n",
1131                         ACPI_THERMAL_FILE_COOLING_MODE));
1132         else {
1133                 entry->proc_fops = &acpi_thermal_cooling_fops;
1134                 entry->data = acpi_driver_data(device);
1135                 entry->owner = THIS_MODULE;
1136         }
1137
1138         /* 'polling_frequency' [R/W] */
1139         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1140                 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
1141         if (!entry)
1142                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1143                         "Unable to create '%s' fs entry\n",
1144                         ACPI_THERMAL_FILE_POLLING_FREQ));
1145         else {
1146                 entry->proc_fops = &acpi_thermal_polling_fops;
1147                 entry->data = acpi_driver_data(device);
1148                 entry->owner = THIS_MODULE;
1149         }
1150
1151         return_VALUE(0);
1152 }
1153
1154
1155 static int
1156 acpi_thermal_remove_fs (
1157         struct acpi_device      *device)
1158 {
1159         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1160
1161         if (acpi_device_dir(device)) {
1162                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1163                                   acpi_device_dir(device));
1164                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1165                                   acpi_device_dir(device));
1166                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1167                                   acpi_device_dir(device));
1168                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1169                                   acpi_device_dir(device));
1170                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1171                                   acpi_device_dir(device));
1172                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1173                 acpi_device_dir(device) = NULL;
1174         }
1175
1176         return_VALUE(0);
1177 }
1178
1179
1180 /* --------------------------------------------------------------------------
1181                                  Driver Interface
1182    -------------------------------------------------------------------------- */
1183
1184 static void
1185 acpi_thermal_notify (
1186         acpi_handle             handle,
1187         u32                     event,
1188         void                    *data)
1189 {
1190         struct acpi_thermal     *tz = (struct acpi_thermal *) data;
1191         struct acpi_device      *device = NULL;
1192
1193         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1194
1195         if (!tz)
1196                 return_VOID;
1197
1198         if (acpi_bus_get_device(tz->handle, &device))
1199                 return_VOID;
1200
1201         switch (event) {
1202         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1203                 acpi_thermal_check(tz);
1204                 break;
1205         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1206                 acpi_thermal_get_trip_points(tz);
1207                 acpi_thermal_check(tz);
1208                 acpi_bus_generate_event(device, event, 0);
1209                 break;
1210         case ACPI_THERMAL_NOTIFY_DEVICES:
1211                 if (tz->flags.devices)
1212                         acpi_thermal_get_devices(tz);
1213                 acpi_bus_generate_event(device, event, 0);
1214                 break;
1215         default:
1216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1217                         "Unsupported event [0x%x]\n", event));
1218                 break;
1219         }
1220
1221         return_VOID;
1222 }
1223
1224
1225 static int
1226 acpi_thermal_get_info (
1227         struct acpi_thermal     *tz)
1228 {
1229         int                     result = 0;
1230
1231         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1232
1233         if (!tz)
1234                 return_VALUE(-EINVAL);
1235
1236         /* Get temperature [_TMP] (required) */
1237         result = acpi_thermal_get_temperature(tz);
1238         if (result)
1239                 return_VALUE(result);
1240
1241         /* Get trip points [_CRT, _PSV, etc.] (required) */
1242         result = acpi_thermal_get_trip_points(tz);
1243         if (result)
1244                 return_VALUE(result);
1245
1246         /* Set the cooling mode [_SCP] to active cooling (default) */
1247         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1248         if (!result)
1249                 tz->flags.cooling_mode = 1;
1250         else {
1251                 /* Oh,we have not _SCP method.
1252                    Generally show cooling_mode by _ACx, _PSV,spec 12.2*/
1253                 tz->flags.cooling_mode = 0;
1254                 if ( tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) {
1255                         if ( tz->trips.passive.temperature > tz->trips.active[0].temperature )
1256                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1257                         else
1258                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1259                 } else if ( !tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) {
1260                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1261                 } else if ( tz->trips.active[0].flags.valid && !tz->trips.passive.flags.valid ) {
1262                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1263                 } else {
1264                         /* _ACx and _PSV are optional, but _CRT is required */
1265                         tz->cooling_mode = ACPI_THERMAL_MODE_CRT;
1266                 }
1267         }
1268
1269         /* Get default polling frequency [_TZP] (optional) */
1270         if (tzp)
1271                 tz->polling_frequency = tzp;
1272         else
1273                 acpi_thermal_get_polling_frequency(tz);
1274
1275         /* Get devices in this thermal zone [_TZD] (optional) */
1276         result = acpi_thermal_get_devices(tz);
1277         if (!result)
1278                 tz->flags.devices = 1;
1279
1280         return_VALUE(0);
1281 }
1282
1283
1284 static int
1285 acpi_thermal_add (
1286         struct acpi_device              *device)
1287 {
1288         int                     result = 0;
1289         acpi_status             status = AE_OK;
1290         struct acpi_thermal     *tz = NULL;
1291
1292         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1293
1294         if (!device)
1295                 return_VALUE(-EINVAL);
1296
1297         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1298         if (!tz)
1299                 return_VALUE(-ENOMEM);
1300         memset(tz, 0, sizeof(struct acpi_thermal));
1301
1302         tz->handle = device->handle;
1303         strcpy(tz->name, device->pnp.bus_id);
1304         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1305         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1306         acpi_driver_data(device) = tz;
1307
1308         result = acpi_thermal_get_info(tz);
1309         if (result)
1310                 goto end;
1311
1312         result = acpi_thermal_add_fs(device);
1313         if (result)
1314                 return_VALUE(result);
1315
1316         init_timer(&tz->timer);
1317
1318         acpi_thermal_check(tz);
1319
1320         status = acpi_install_notify_handler(tz->handle,
1321                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify, tz);
1322         if (ACPI_FAILURE(status)) {
1323                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1324                         "Error installing notify handler\n"));
1325                 result = -ENODEV;
1326                 goto end;
1327         }
1328
1329         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1330                 acpi_device_name(device), acpi_device_bid(device),
1331                 KELVIN_TO_CELSIUS(tz->temperature));
1332
1333 end:
1334         if (result) {
1335                 acpi_thermal_remove_fs(device);
1336                 kfree(tz);
1337         }
1338
1339         return_VALUE(result);
1340 }
1341
1342
1343 static int
1344 acpi_thermal_remove (
1345         struct acpi_device      *device,
1346         int                     type)
1347 {
1348         acpi_status             status = AE_OK;
1349         struct acpi_thermal     *tz = NULL;
1350
1351         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1352
1353         if (!device || !acpi_driver_data(device))
1354                 return_VALUE(-EINVAL);
1355
1356         tz = (struct acpi_thermal *) acpi_driver_data(device);
1357
1358         /* avoid timer adding new defer task */
1359         tz->zombie = 1;
1360         /* wait for running timer (on other CPUs) finish */
1361         del_timer_sync(&(tz->timer));
1362         /* synchronize deferred task */
1363         acpi_os_wait_events_complete(NULL);
1364         /* deferred task may reinsert timer */
1365         del_timer_sync(&(tz->timer));
1366
1367         status = acpi_remove_notify_handler(tz->handle,
1368                 ACPI_DEVICE_NOTIFY, acpi_thermal_notify);
1369         if (ACPI_FAILURE(status))
1370                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1371                         "Error removing notify handler\n"));
1372
1373         /* Terminate policy */
1374         if (tz->trips.passive.flags.valid
1375                 && tz->trips.passive.flags.enabled) {
1376                 tz->trips.passive.flags.enabled = 0;
1377                 acpi_thermal_passive(tz);
1378         }
1379         if (tz->trips.active[0].flags.valid
1380                 && tz->trips.active[0].flags.enabled) {
1381                 tz->trips.active[0].flags.enabled = 0;
1382                 acpi_thermal_active(tz);
1383         }
1384
1385         acpi_thermal_remove_fs(device);
1386
1387         kfree(tz);
1388         return_VALUE(0);
1389 }
1390
1391
1392 static int __init
1393 acpi_thermal_init (void)
1394 {
1395         int                     result = 0;
1396
1397         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1398
1399         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1400         if (!acpi_thermal_dir)
1401                 return_VALUE(-ENODEV);
1402         acpi_thermal_dir->owner = THIS_MODULE;
1403
1404         result = acpi_bus_register_driver(&acpi_thermal_driver);
1405         if (result < 0) {
1406                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1407                 return_VALUE(-ENODEV);
1408         }
1409
1410         return_VALUE(0);
1411 }
1412
1413
1414 static void __exit
1415 acpi_thermal_exit (void)
1416 {
1417         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1418
1419         acpi_bus_unregister_driver(&acpi_thermal_driver);
1420
1421         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1422
1423         return_VOID;
1424 }
1425
1426
1427 module_init(acpi_thermal_init);
1428 module_exit(acpi_thermal_exit);