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/timer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <asm/uaccess.h>
  44
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47
  48 #define ACPI_THERMAL_COMPONENT          0x04000000
  49 #define ACPI_THERMAL_CLASS              "thermal_zone"
  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_CRITICAL      0xff
  64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  71
  72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  73 ACPI_MODULE_NAME("thermal");
  74
  75 MODULE_AUTHOR("Paul Diefenbaugh");
  76 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  77 MODULE_LICENSE("GPL");
  78
  79 static int tzp;
  80 module_param(tzp, int, 0);
  81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  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_resume(struct acpi_device *device);
  86 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  88 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  89 static ssize_t acpi_thermal_write_trip_points(struct file *,
  90                                               const char __user *, size_t,
  91                                               loff_t *);
  92 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  93 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  94                                                const char __user *, size_t,
  95                                                loff_t *);
  96 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  97 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  98                                           size_t, loff_t *);
  99
 100 static struct acpi_driver acpi_thermal_driver = {
 101         .name = "thermal",
 102         .class = ACPI_THERMAL_CLASS,
 103         .ids = ACPI_THERMAL_HID,
 104         .ops = {
 105                 .add = acpi_thermal_add,
 106                 .remove = acpi_thermal_remove,
 107                 .resume = acpi_thermal_resume,
 108                 },
 109 };
 110
 111 struct acpi_thermal_state {
 112         u8 critical:1;
 113         u8 hot:1;
 114         u8 passive:1;
 115         u8 active:1;
 116         u8 reserved:4;
 117         int active_index;
 118 };
 119
 120 struct acpi_thermal_state_flags {
 121         u8 valid:1;
 122         u8 enabled:1;
 123         u8 reserved:6;
 124 };
 125
 126 struct acpi_thermal_critical {
 127         struct acpi_thermal_state_flags flags;
 128         unsigned long temperature;
 129 };
 130
 131 struct acpi_thermal_hot {
 132         struct acpi_thermal_state_flags flags;
 133         unsigned long temperature;
 134 };
 135
 136 struct acpi_thermal_passive {
 137         struct acpi_thermal_state_flags flags;
 138         unsigned long temperature;
 139         unsigned long tc1;
 140         unsigned long tc2;
 141         unsigned long tsp;
 142         struct acpi_handle_list devices;
 143 };
 144
 145 struct acpi_thermal_active {
 146         struct acpi_thermal_state_flags flags;
 147         unsigned long temperature;
 148         struct acpi_handle_list devices;
 149 };
 150
 151 struct acpi_thermal_trips {
 152         struct acpi_thermal_critical critical;
 153         struct acpi_thermal_hot hot;
 154         struct acpi_thermal_passive passive;
 155         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 156 };
 157
 158 struct acpi_thermal_flags {
 159         u8 cooling_mode:1;      /* _SCP */
 160         u8 devices:1;           /* _TZD */
 161         u8 reserved:6;
 162 };
 163
 164 struct acpi_thermal {
 165         struct acpi_device * device;
 166         acpi_bus_id name;
 167         unsigned long temperature;
 168         unsigned long last_temperature;
 169         unsigned long polling_frequency;
 170         u8 cooling_mode;
 171         volatile u8 zombie;
 172         struct acpi_thermal_flags flags;
 173         struct acpi_thermal_state state;
 174         struct acpi_thermal_trips trips;
 175         struct acpi_handle_list devices;
 176         struct timer_list timer;
 177 };
 178
 179 static const struct file_operations acpi_thermal_state_fops = {
 180         .open = acpi_thermal_state_open_fs,
 181         .read = seq_read,
 182         .llseek = seq_lseek,
 183         .release = single_release,
 184 };
 185
 186 static const struct file_operations acpi_thermal_temp_fops = {
 187         .open = acpi_thermal_temp_open_fs,
 188         .read = seq_read,
 189         .llseek = seq_lseek,
 190         .release = single_release,
 191 };
 192
 193 static const struct file_operations acpi_thermal_trip_fops = {
 194         .open = acpi_thermal_trip_open_fs,
 195         .read = seq_read,
 196         .write = acpi_thermal_write_trip_points,
 197         .llseek = seq_lseek,
 198         .release = single_release,
 199 };
 200
 201 static const struct file_operations acpi_thermal_cooling_fops = {
 202         .open = acpi_thermal_cooling_open_fs,
 203         .read = seq_read,
 204         .write = acpi_thermal_write_cooling_mode,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static const struct file_operations acpi_thermal_polling_fops = {
 210         .open = acpi_thermal_polling_open_fs,
 211         .read = seq_read,
 212         .write = acpi_thermal_write_polling,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 /* --------------------------------------------------------------------------
 218                              Thermal Zone Management
 219    -------------------------------------------------------------------------- */
 220
 221 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 222 {
 223         acpi_status status = AE_OK;
 224
 225
 226         if (!tz)
 227                 return -EINVAL;
 228
 229         tz->last_temperature = tz->temperature;
 230
 231         status =
 232             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 233         if (ACPI_FAILURE(status))
 234                 return -ENODEV;
 235
 236         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 237                           tz->temperature));
 238
 239         return 0;
 240 }
 241
 242 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 243 {
 244         acpi_status status = AE_OK;
 245
 246
 247         if (!tz)
 248                 return -EINVAL;
 249
 250         status =
 251             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 252                                   &tz->polling_frequency);
 253         if (ACPI_FAILURE(status))
 254                 return -ENODEV;
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 257                           tz->polling_frequency));
 258
 259         return 0;
 260 }
 261
 262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 263 {
 264
 265         if (!tz)
 266                 return -EINVAL;
 267
 268         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 269
 270         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 271                           "Polling frequency set to %lu seconds\n",
 272                           tz->polling_frequency/10));
 273
 274         return 0;
 275 }
 276
 277 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 278 {
 279         acpi_status status = AE_OK;
 280         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 281         struct acpi_object_list arg_list = { 1, &arg0 };
 282         acpi_handle handle = NULL;
 283
 284
 285         if (!tz)
 286                 return -EINVAL;
 287
 288         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 289         if (ACPI_FAILURE(status)) {
 290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 291                 return -ENODEV;
 292         }
 293
 294         arg0.integer.value = mode;
 295
 296         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 297         if (ACPI_FAILURE(status))
 298                 return -ENODEV;
 299
 300         tz->cooling_mode = mode;
 301
 302         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 303                           mode ? "passive" : "active"));
 304
 305         return 0;
 306 }
 307
 308 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 309 {
 310         acpi_status status = AE_OK;
 311         int i = 0;
 312
 313
 314         if (!tz)
 315                 return -EINVAL;
 316
 317         /* Critical Shutdown (required) */
 318
 319         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 320                                        &tz->trips.critical.temperature);
 321         if (ACPI_FAILURE(status)) {
 322                 tz->trips.critical.flags.valid = 0;
 323                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 324                 return -ENODEV;
 325         } else {
 326                 tz->trips.critical.flags.valid = 1;
 327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 328                                   "Found critical threshold [%lu]\n",
 329                                   tz->trips.critical.temperature));
 330         }
 331
 332         /* Critical Sleep (optional) */
 333
 334         status =
 335             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 336                                   &tz->trips.hot.temperature);
 337         if (ACPI_FAILURE(status)) {
 338                 tz->trips.hot.flags.valid = 0;
 339                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 340         } else {
 341                 tz->trips.hot.flags.valid = 1;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 343                                   tz->trips.hot.temperature));
 344         }
 345
 346         /* Passive: Processors (optional) */
 347
 348         status =
 349             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
 350                                   &tz->trips.passive.temperature);
 351         if (ACPI_FAILURE(status)) {
 352                 tz->trips.passive.flags.valid = 0;
 353                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 354         } else {
 355                 tz->trips.passive.flags.valid = 1;
 356
 357                 status =
 358                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 359                                           &tz->trips.passive.tc1);
 360                 if (ACPI_FAILURE(status))
 361                         tz->trips.passive.flags.valid = 0;
 362
 363                 status =
 364                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 365                                           &tz->trips.passive.tc2);
 366                 if (ACPI_FAILURE(status))
 367                         tz->trips.passive.flags.valid = 0;
 368
 369                 status =
 370                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 371                                           &tz->trips.passive.tsp);
 372                 if (ACPI_FAILURE(status))
 373                         tz->trips.passive.flags.valid = 0;
 374
 375                 status =
 376                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 377                                             &tz->trips.passive.devices);
 378                 if (ACPI_FAILURE(status))
 379                         tz->trips.passive.flags.valid = 0;
 380
 381                 if (!tz->trips.passive.flags.valid)
 382                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 383                 else
 384                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 385                                           "Found passive threshold [%lu]\n",
 386                                           tz->trips.passive.temperature));
 387         }
 388
 389         /* Active: Fans, etc. (optional) */
 390
 391         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 392
 393                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 394
 395                 status =
 396                     acpi_evaluate_integer(tz->device->handle, name, NULL,
 397                                           &tz->trips.active[i].temperature);
 398                 if (ACPI_FAILURE(status))
 399                         break;
 400
 401                 name[2] = 'L';
 402                 status =
 403                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 404                                             &tz->trips.active[i].devices);
 405                 if (ACPI_SUCCESS(status)) {
 406                         tz->trips.active[i].flags.valid = 1;
 407                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 408                                           "Found active threshold [%d]:[%lu]\n",
 409                                           i, tz->trips.active[i].temperature));
 410                 } else
 411                         ACPI_EXCEPTION((AE_INFO, status,
 412                                         "Invalid active threshold [%d]", i));
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 419 {
 420         acpi_status status = AE_OK;
 421
 422
 423         if (!tz)
 424                 return -EINVAL;
 425
 426         status =
 427             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 428         if (ACPI_FAILURE(status))
 429                 return -ENODEV;
 430
 431         return 0;
 432 }
 433
 434 static int acpi_thermal_call_usermode(char *path)
 435 {
 436         char *argv[2] = { NULL, NULL };
 437         char *envp[3] = { NULL, NULL, NULL };
 438
 439
 440         if (!path)
 441                 return -EINVAL;
 442
 443         argv[0] = path;
 444
 445         /* minimal command environment */
 446         envp[0] = "HOME=/";
 447         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 448
 449         call_usermodehelper(argv[0], argv, envp, 0);
 450
 451         return 0;
 452 }
 453
 454 static int acpi_thermal_critical(struct acpi_thermal *tz)
 455 {
 456         if (!tz || !tz->trips.critical.flags.valid)
 457                 return -EINVAL;
 458
 459         if (tz->temperature >= tz->trips.critical.temperature) {
 460                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 461                 tz->trips.critical.flags.enabled = 1;
 462         } else if (tz->trips.critical.flags.enabled)
 463                 tz->trips.critical.flags.enabled = 0;
 464
 465         printk(KERN_EMERG
 466                "Critical temperature reached (%ld C), shutting down.\n",
 467                KELVIN_TO_CELSIUS(tz->temperature));
 468         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 469                                 tz->trips.critical.flags.enabled);
 470
 471         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 472
 473         return 0;
 474 }
 475
 476 static int acpi_thermal_hot(struct acpi_thermal *tz)
 477 {
 478         if (!tz || !tz->trips.hot.flags.valid)
 479                 return -EINVAL;
 480
 481         if (tz->temperature >= tz->trips.hot.temperature) {
 482                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 483                 tz->trips.hot.flags.enabled = 1;
 484         } else if (tz->trips.hot.flags.enabled)
 485                 tz->trips.hot.flags.enabled = 0;
 486
 487         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 488                                 tz->trips.hot.flags.enabled);
 489
 490         /* TBD: Call user-mode "sleep(S4)" function */
 491
 492         return 0;
 493 }
 494
 495 static void acpi_thermal_passive(struct acpi_thermal *tz)
 496 {
 497         int result = 1;
 498         struct acpi_thermal_passive *passive = NULL;
 499         int trend = 0;
 500         int i = 0;
 501
 502
 503         if (!tz || !tz->trips.passive.flags.valid)
 504                 return;
 505
 506         passive = &(tz->trips.passive);
 507
 508         /*
 509          * Above Trip?
 510          * -----------
 511          * Calculate the thermal trend (using the passive cooling equation)
 512          * and modify the performance limit for all passive cooling devices
 513          * accordingly.  Note that we assume symmetry.
 514          */
 515         if (tz->temperature >= passive->temperature) {
 516                 trend =
 517                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 518                     (passive->tc2 * (tz->temperature - passive->temperature));
 519                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 520                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 521                                   trend, passive->tc1, tz->temperature,
 522                                   tz->last_temperature, passive->tc2,
 523                                   tz->temperature, passive->temperature));
 524                 passive->flags.enabled = 1;
 525                 /* Heating up? */
 526                 if (trend > 0)
 527                         for (i = 0; i < passive->devices.count; i++)
 528                                 acpi_processor_set_thermal_limit(passive->
 529                                                                  devices.
 530                                                                  handles[i],
 531                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 532                 /* Cooling off? */
 533                 else if (trend < 0) {
 534                         for (i = 0; i < passive->devices.count; i++)
 535                                 /*
 536                                  * assume that we are on highest
 537                                  * freq/lowest thrott and can leave
 538                                  * passive mode, even in error case
 539                                  */
 540                                 if (!acpi_processor_set_thermal_limit
 541                                     (passive->devices.handles[i],
 542                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 543                                         result = 0;
 544                         /*
 545                          * Leave cooling mode, even if the temp might
 546                          * higher than trip point This is because some
 547                          * machines might have long thermal polling
 548                          * frequencies (tsp) defined. We will fall back
 549                          * into passive mode in next cycle (probably quicker)
 550                          */
 551                         if (result) {
 552                                 passive->flags.enabled = 0;
 553                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 554                                                   "Disabling passive cooling, still above threshold,"
 555                                                   " but we are cooling down\n"));
 556                         }
 557                 }
 558                 return;
 559         }
 560
 561         /*
 562          * Below Trip?
 563          * -----------
 564          * Implement passive cooling hysteresis to slowly increase performance
 565          * and avoid thrashing around the passive trip point.  Note that we
 566          * assume symmetry.
 567          */
 568         if (!passive->flags.enabled)
 569                 return;
 570         for (i = 0; i < passive->devices.count; i++)
 571                 if (!acpi_processor_set_thermal_limit
 572                     (passive->devices.handles[i],
 573                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 574                         result = 0;
 575         if (result) {
 576                 passive->flags.enabled = 0;
 577                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 578                                   "Disabling passive cooling (zone is cool)\n"));
 579         }
 580 }
 581
 582 static void acpi_thermal_active(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
 591         if (!tz)
 592                 return;
 593
 594         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 595                 active = &(tz->trips.active[i]);
 596                 if (!active || !active->flags.valid)
 597                         break;
 598                 if (tz->temperature >= active->temperature) {
 599                         /*
 600                          * Above Threshold?
 601                          * ----------------
 602                          * If not already enabled, turn ON all cooling devices
 603                          * associated with this active threshold.
 604                          */
 605                         if (active->temperature > maxtemp)
 606                                 tz->state.active_index = i;
 607                         maxtemp = active->temperature;
 608                         if (active->flags.enabled)
 609                                 continue;
 610                         for (j = 0; j < active->devices.count; j++) {
 611                                 result =
 612                                     acpi_bus_set_power(active->devices.
 613                                                        handles[j],
 614                                                        ACPI_STATE_D0);
 615                                 if (result) {
 616                                         printk(KERN_WARNING PREFIX
 617                                                       "Unable to turn cooling device [%p] 'on'\n",
 618                                                       active->devices.
 619                                                       handles[j]);
 620                                         continue;
 621                                 }
 622                                 active->flags.enabled = 1;
 623                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 624                                                   "Cooling device [%p] now 'on'\n",
 625                                                   active->devices.handles[j]));
 626                         }
 627                         continue;
 628                 }
 629                 if (!active->flags.enabled)
 630                         continue;
 631                 /*
 632                  * Below Threshold?
 633                  * ----------------
 634                  * Turn OFF all cooling devices associated with this
 635                  * threshold.
 636                  */
 637                 for (j = 0; j < active->devices.count; j++) {
 638                         result = acpi_bus_set_power(active->devices.handles[j],
 639                                                     ACPI_STATE_D3);
 640                         if (result) {
 641                                 printk(KERN_WARNING PREFIX
 642                                               "Unable to turn cooling device [%p] 'off'\n",
 643                                               active->devices.handles[j]);
 644                                 continue;
 645                         }
 646                         active->flags.enabled = 0;
 647                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 648                                           "Cooling device [%p] now 'off'\n",
 649                                           active->devices.handles[j]));
 650                 }
 651         }
 652 }
 653
 654 static void acpi_thermal_check(void *context);
 655
 656 static void acpi_thermal_run(unsigned long data)
 657 {
 658         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 659         if (!tz->zombie)
 660                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 661 }
 662
 663 static void acpi_thermal_check(void *data)
 664 {
 665         int result = 0;
 666         struct acpi_thermal *tz = data;
 667         unsigned long sleep_time = 0;
 668         int i = 0;
 669         struct acpi_thermal_state state;
 670
 671
 672         if (!tz) {
 673                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 674                 return;
 675         }
 676
 677         state = tz->state;
 678
 679         result = acpi_thermal_get_temperature(tz);
 680         if (result)
 681                 return;
 682
 683         memset(&tz->state, 0, sizeof(tz->state));
 684
 685         /*
 686          * Check Trip Points
 687          * -----------------
 688          * Compare the current temperature to the trip point values to see
 689          * if we've entered one of the thermal policy states.  Note that
 690          * this function determines when a state is entered, but the
 691          * individual policy decides when it is exited (e.g. hysteresis).
 692          */
 693         if (tz->trips.critical.flags.valid)
 694                 state.critical |=
 695                     (tz->temperature >= tz->trips.critical.temperature);
 696         if (tz->trips.hot.flags.valid)
 697                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 698         if (tz->trips.passive.flags.valid)
 699                 state.passive |=
 700                     (tz->temperature >= tz->trips.passive.temperature);
 701         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 702                 if (tz->trips.active[i].flags.valid)
 703                         state.active |=
 704                             (tz->temperature >=
 705                              tz->trips.active[i].temperature);
 706
 707         /*
 708          * Invoke Policy
 709          * -------------
 710          * Separated from the above check to allow individual policy to
 711          * determine when to exit a given state.
 712          */
 713         if (state.critical)
 714                 acpi_thermal_critical(tz);
 715         if (state.hot)
 716                 acpi_thermal_hot(tz);
 717         if (state.passive)
 718                 acpi_thermal_passive(tz);
 719         if (state.active)
 720                 acpi_thermal_active(tz);
 721
 722         /*
 723          * Calculate State
 724          * ---------------
 725          * Again, separated from the above two to allow independent policy
 726          * decisions.
 727          */
 728         tz->state.critical = tz->trips.critical.flags.enabled;
 729         tz->state.hot = tz->trips.hot.flags.enabled;
 730         tz->state.passive = tz->trips.passive.flags.enabled;
 731         tz->state.active = 0;
 732         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 733                 tz->state.active |= tz->trips.active[i].flags.enabled;
 734
 735         /*
 736          * Calculate Sleep Time
 737          * --------------------
 738          * If we're in the passive state, use _TSP's value.  Otherwise
 739          * use the default polling frequency (e.g. _TZP).  If no polling
 740          * frequency is specified then we'll wait forever (at least until
 741          * a thermal event occurs).  Note that _TSP and _TZD values are
 742          * given in 1/10th seconds (we must covert to milliseconds).
 743          */
 744         if (tz->state.passive)
 745                 sleep_time = tz->trips.passive.tsp * 100;
 746         else if (tz->polling_frequency > 0)
 747                 sleep_time = tz->polling_frequency * 100;
 748
 749         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 750                           tz->name, tz->temperature, sleep_time));
 751
 752         /*
 753          * Schedule Next Poll
 754          * ------------------
 755          */
 756         if (!sleep_time) {
 757                 if (timer_pending(&(tz->timer)))
 758                         del_timer(&(tz->timer));
 759         } else {
 760                 if (timer_pending(&(tz->timer)))
 761                         mod_timer(&(tz->timer),
 762                                         jiffies + (HZ * sleep_time) / 1000);
 763                 else {
 764                         tz->timer.data = (unsigned long)tz;
 765                         tz->timer.function = acpi_thermal_run;
 766                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 767                         add_timer(&(tz->timer));
 768                 }
 769         }
 770
 771         return;
 772 }
 773
 774 /* --------------------------------------------------------------------------
 775                               FS Interface (/proc)
 776    -------------------------------------------------------------------------- */
 777
 778 static struct proc_dir_entry *acpi_thermal_dir;
 779
 780 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 781 {
 782         struct acpi_thermal *tz = seq->private;
 783
 784
 785         if (!tz)
 786                 goto end;
 787
 788         seq_puts(seq, "state:                   ");
 789
 790         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 791             && !tz->state.active)
 792                 seq_puts(seq, "ok\n");
 793         else {
 794                 if (tz->state.critical)
 795                         seq_puts(seq, "critical ");
 796                 if (tz->state.hot)
 797                         seq_puts(seq, "hot ");
 798                 if (tz->state.passive)
 799                         seq_puts(seq, "passive ");
 800                 if (tz->state.active)
 801                         seq_printf(seq, "active[%d]", tz->state.active_index);
 802                 seq_puts(seq, "\n");
 803         }
 804
 805       end:
 806         return 0;
 807 }
 808
 809 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 810 {
 811         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 812 }
 813
 814 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 815 {
 816         int result = 0;
 817         struct acpi_thermal *tz = seq->private;
 818
 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 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 840 {
 841         struct acpi_thermal *tz = seq->private;
 842         int i = 0;
 843         int j = 0;
 844
 845
 846         if (!tz)
 847                 goto end;
 848
 849         if (tz->trips.critical.flags.valid)
 850                 seq_printf(seq, "critical (S5):           %ld C\n",
 851                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 852
 853         if (tz->trips.hot.flags.valid)
 854                 seq_printf(seq, "hot (S4):                %ld C\n",
 855                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 856
 857         if (tz->trips.passive.flags.valid) {
 858                 seq_printf(seq,
 859                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 860                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 861                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 862                            tz->trips.passive.tsp);
 863                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 864
 865                         seq_printf(seq, "0x%p ",
 866                                    tz->trips.passive.devices.handles[j]);
 867                 }
 868                 seq_puts(seq, "\n");
 869         }
 870
 871         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 872                 if (!(tz->trips.active[i].flags.valid))
 873                         break;
 874                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 875                            i,
 876                            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(struct file *file,
 894                                const char __user * buffer,
 895                                size_t count, loff_t * ppos)
 896 {
 897         struct seq_file *m = file->private_data;
 898         struct acpi_thermal *tz = m->private;
 899
 900         char *limit_string;
 901         int num, critical, hot, passive;
 902         int *active;
 903         int i = 0;
 904
 905
 906         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 907         if (!limit_string)
 908                 return -ENOMEM;
 909
 910         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 911         if (!active) {
 912                 kfree(limit_string);
 913                 return -ENOMEM;
 914         }
 915
 916         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 917                 count = -EINVAL;
 918                 goto end;
 919         }
 920
 921         if (copy_from_user(limit_string, buffer, count)) {
 922                 count = -EFAULT;
 923                 goto end;
 924         }
 925
 926         limit_string[count] = '\0';
 927
 928         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 929                      &critical, &hot, &passive,
 930                      &active[0], &active[1], &active[2], &active[3], &active[4],
 931                      &active[5], &active[6], &active[7], &active[8],
 932                      &active[9]);
 933         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 934                 count = -EINVAL;
 935                 goto end;
 936         }
 937
 938         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 939         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 940         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 941         for (i = 0; i < num - 3; i++) {
 942                 if (!(tz->trips.active[i].flags.valid))
 943                         break;
 944                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 945         }
 946
 947       end:
 948         kfree(active);
 949         kfree(limit_string);
 950         return count;
 951 }
 952
 953 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 954 {
 955         struct acpi_thermal *tz = seq->private;
 956
 957
 958         if (!tz)
 959                 goto end;
 960
 961         if (!tz->flags.cooling_mode) {
 962                 seq_puts(seq, "<setting not supported>\n");
 963         }
 964
 965         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 966                 seq_printf(seq, "cooling mode:  critical\n");
 967         else
 968                 seq_printf(seq, "cooling mode:  %s\n",
 969                            tz->cooling_mode ? "passive" : "active");
 970
 971       end:
 972         return 0;
 973 }
 974
 975 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 976 {
 977         return single_open(file, acpi_thermal_cooling_seq_show,
 978                            PDE(inode)->data);
 979 }
 980
 981 static ssize_t
 982 acpi_thermal_write_cooling_mode(struct file *file,
 983                                 const char __user * buffer,
 984                                 size_t count, loff_t * ppos)
 985 {
 986         struct seq_file *m = file->private_data;
 987         struct acpi_thermal *tz = m->private;
 988         int result = 0;
 989         char mode_string[12] = { '\0' };
 990
 991
 992         if (!tz || (count > sizeof(mode_string) - 1))
 993                 return -EINVAL;
 994
 995         if (!tz->flags.cooling_mode)
 996                 return -ENODEV;
 997
 998         if (copy_from_user(mode_string, buffer, count))
 999                 return -EFAULT;
1000
1001         mode_string[count] = '\0';
1002
1003         result = acpi_thermal_set_cooling_mode(tz,
1004                                                simple_strtoul(mode_string, NULL,
1005                                                               0));
1006         if (result)
1007                 return result;
1008
1009         acpi_thermal_check(tz);
1010
1011         return count;
1012 }
1013
1014 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1015 {
1016         struct acpi_thermal *tz = seq->private;
1017
1018
1019         if (!tz)
1020                 goto end;
1021
1022         if (!tz->polling_frequency) {
1023                 seq_puts(seq, "<polling disabled>\n");
1024                 goto end;
1025         }
1026
1027         seq_printf(seq, "polling frequency:       %lu seconds\n",
1028                    (tz->polling_frequency / 10));
1029
1030       end:
1031         return 0;
1032 }
1033
1034 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1035 {
1036         return single_open(file, acpi_thermal_polling_seq_show,
1037                            PDE(inode)->data);
1038 }
1039
1040 static ssize_t
1041 acpi_thermal_write_polling(struct file *file,
1042                            const char __user * buffer,
1043                            size_t count, loff_t * ppos)
1044 {
1045         struct seq_file *m = file->private_data;
1046         struct acpi_thermal *tz = m->private;
1047         int result = 0;
1048         char polling_string[12] = { '\0' };
1049         int seconds = 0;
1050
1051
1052         if (!tz || (count > sizeof(polling_string) - 1))
1053                 return -EINVAL;
1054
1055         if (copy_from_user(polling_string, buffer, count))
1056                 return -EFAULT;
1057
1058         polling_string[count] = '\0';
1059
1060         seconds = simple_strtoul(polling_string, NULL, 0);
1061
1062         result = acpi_thermal_set_polling(tz, seconds);
1063         if (result)
1064                 return result;
1065
1066         acpi_thermal_check(tz);
1067
1068         return count;
1069 }
1070
1071 static int acpi_thermal_add_fs(struct acpi_device *device)
1072 {
1073         struct proc_dir_entry *entry = NULL;
1074
1075
1076         if (!acpi_device_dir(device)) {
1077                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1078                                                      acpi_thermal_dir);
1079                 if (!acpi_device_dir(device))
1080                         return -ENODEV;
1081                 acpi_device_dir(device)->owner = THIS_MODULE;
1082         }
1083
1084         /* 'state' [R] */
1085         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1086                                   S_IRUGO, acpi_device_dir(device));
1087         if (!entry)
1088                 return -ENODEV;
1089         else {
1090                 entry->proc_fops = &acpi_thermal_state_fops;
1091                 entry->data = acpi_driver_data(device);
1092                 entry->owner = THIS_MODULE;
1093         }
1094
1095         /* 'temperature' [R] */
1096         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1097                                   S_IRUGO, acpi_device_dir(device));
1098         if (!entry)
1099                 return -ENODEV;
1100         else {
1101                 entry->proc_fops = &acpi_thermal_temp_fops;
1102                 entry->data = acpi_driver_data(device);
1103                 entry->owner = THIS_MODULE;
1104         }
1105
1106         /* 'trip_points' [R/W] */
1107         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1108                                   S_IFREG | S_IRUGO | S_IWUSR,
1109                                   acpi_device_dir(device));
1110         if (!entry)
1111                 return -ENODEV;
1112         else {
1113                 entry->proc_fops = &acpi_thermal_trip_fops;
1114                 entry->data = acpi_driver_data(device);
1115                 entry->owner = THIS_MODULE;
1116         }
1117
1118         /* 'cooling_mode' [R/W] */
1119         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1120                                   S_IFREG | S_IRUGO | S_IWUSR,
1121                                   acpi_device_dir(device));
1122         if (!entry)
1123                 return -ENODEV;
1124         else {
1125                 entry->proc_fops = &acpi_thermal_cooling_fops;
1126                 entry->data = acpi_driver_data(device);
1127                 entry->owner = THIS_MODULE;
1128         }
1129
1130         /* 'polling_frequency' [R/W] */
1131         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1132                                   S_IFREG | S_IRUGO | S_IWUSR,
1133                                   acpi_device_dir(device));
1134         if (!entry)
1135                 return -ENODEV;
1136         else {
1137                 entry->proc_fops = &acpi_thermal_polling_fops;
1138                 entry->data = acpi_driver_data(device);
1139                 entry->owner = THIS_MODULE;
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int acpi_thermal_remove_fs(struct acpi_device *device)
1146 {
1147
1148         if (acpi_device_dir(device)) {
1149                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1154                                   acpi_device_dir(device));
1155                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1156                                   acpi_device_dir(device));
1157                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1158                                   acpi_device_dir(device));
1159                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1160                 acpi_device_dir(device) = NULL;
1161         }
1162
1163         return 0;
1164 }
1165
1166 /* --------------------------------------------------------------------------
1167                                  Driver Interface
1168    -------------------------------------------------------------------------- */
1169
1170 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1171 {
1172         struct acpi_thermal *tz = data;
1173         struct acpi_device *device = NULL;
1174
1175
1176         if (!tz)
1177                 return;
1178
1179         device = tz->device;
1180
1181         switch (event) {
1182         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1183                 acpi_thermal_check(tz);
1184                 break;
1185         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1186                 acpi_thermal_get_trip_points(tz);
1187                 acpi_thermal_check(tz);
1188                 acpi_bus_generate_event(device, event, 0);
1189                 break;
1190         case ACPI_THERMAL_NOTIFY_DEVICES:
1191                 if (tz->flags.devices)
1192                         acpi_thermal_get_devices(tz);
1193                 acpi_bus_generate_event(device, event, 0);
1194                 break;
1195         default:
1196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1197                                   "Unsupported event [0x%x]\n", event));
1198                 break;
1199         }
1200
1201         return;
1202 }
1203
1204 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1205 {
1206         int result = 0;
1207
1208
1209         if (!tz)
1210                 return -EINVAL;
1211
1212         /* Get temperature [_TMP] (required) */
1213         result = acpi_thermal_get_temperature(tz);
1214         if (result)
1215                 return result;
1216
1217         /* Get trip points [_CRT, _PSV, etc.] (required) */
1218         result = acpi_thermal_get_trip_points(tz);
1219         if (result)
1220                 return result;
1221
1222         /* Set the cooling mode [_SCP] to active cooling (default) */
1223         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1224         if (!result)
1225                 tz->flags.cooling_mode = 1;
1226         else {
1227                 /* Oh,we have not _SCP method.
1228                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1229                 tz->flags.cooling_mode = 0;
1230                 if (tz->trips.active[0].flags.valid
1231                     && tz->trips.passive.flags.valid) {
1232                         if (tz->trips.passive.temperature >
1233                             tz->trips.active[0].temperature)
1234                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1235                         else
1236                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1237                 } else if (!tz->trips.active[0].flags.valid
1238                            && tz->trips.passive.flags.valid) {
1239                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1240                 } else if (tz->trips.active[0].flags.valid
1241                            && !tz->trips.passive.flags.valid) {
1242                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1243                 } else {
1244                         /* _ACx and _PSV are optional, but _CRT is required */
1245                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1246                 }
1247         }
1248
1249         /* Get default polling frequency [_TZP] (optional) */
1250         if (tzp)
1251                 tz->polling_frequency = tzp;
1252         else
1253                 acpi_thermal_get_polling_frequency(tz);
1254
1255         /* Get devices in this thermal zone [_TZD] (optional) */
1256         result = acpi_thermal_get_devices(tz);
1257         if (!result)
1258                 tz->flags.devices = 1;
1259
1260         return 0;
1261 }
1262
1263 static int acpi_thermal_add(struct acpi_device *device)
1264 {
1265         int result = 0;
1266         acpi_status status = AE_OK;
1267         struct acpi_thermal *tz = NULL;
1268
1269
1270         if (!device)
1271                 return -EINVAL;
1272
1273         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1274         if (!tz)
1275                 return -ENOMEM;
1276
1277         tz->device = device;
1278         strcpy(tz->name, device->pnp.bus_id);
1279         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1280         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1281         acpi_driver_data(device) = tz;
1282
1283         result = acpi_thermal_get_info(tz);
1284         if (result)
1285                 goto end;
1286
1287         result = acpi_thermal_add_fs(device);
1288         if (result)
1289                 goto end;
1290
1291         init_timer(&tz->timer);
1292
1293         acpi_thermal_check(tz);
1294
1295         status = acpi_install_notify_handler(device->handle,
1296                                              ACPI_DEVICE_NOTIFY,
1297                                              acpi_thermal_notify, tz);
1298         if (ACPI_FAILURE(status)) {
1299                 result = -ENODEV;
1300                 goto end;
1301         }
1302
1303         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1304                acpi_device_name(device), acpi_device_bid(device),
1305                KELVIN_TO_CELSIUS(tz->temperature));
1306
1307       end:
1308         if (result) {
1309                 acpi_thermal_remove_fs(device);
1310                 kfree(tz);
1311         }
1312
1313         return result;
1314 }
1315
1316 static int acpi_thermal_remove(struct acpi_device *device, int type)
1317 {
1318         acpi_status status = AE_OK;
1319         struct acpi_thermal *tz = NULL;
1320
1321
1322         if (!device || !acpi_driver_data(device))
1323                 return -EINVAL;
1324
1325         tz = acpi_driver_data(device);
1326
1327         /* avoid timer adding new defer task */
1328         tz->zombie = 1;
1329         /* wait for running timer (on other CPUs) finish */
1330         del_timer_sync(&(tz->timer));
1331         /* synchronize deferred task */
1332         acpi_os_wait_events_complete(NULL);
1333         /* deferred task may reinsert timer */
1334         del_timer_sync(&(tz->timer));
1335
1336         status = acpi_remove_notify_handler(device->handle,
1337                                             ACPI_DEVICE_NOTIFY,
1338                                             acpi_thermal_notify);
1339
1340         /* Terminate policy */
1341         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1342                 tz->trips.passive.flags.enabled = 0;
1343                 acpi_thermal_passive(tz);
1344         }
1345         if (tz->trips.active[0].flags.valid
1346             && tz->trips.active[0].flags.enabled) {
1347                 tz->trips.active[0].flags.enabled = 0;
1348                 acpi_thermal_active(tz);
1349         }
1350
1351         acpi_thermal_remove_fs(device);
1352
1353         kfree(tz);
1354         return 0;
1355 }
1356
1357 static int acpi_thermal_resume(struct acpi_device *device)
1358 {
1359         struct acpi_thermal *tz = NULL;
1360         int i, j, power_state, result;
1361
1362
1363         if (!device || !acpi_driver_data(device))
1364                 return -EINVAL;
1365
1366         tz = acpi_driver_data(device);
1367
1368         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1369                 if (!(&tz->trips.active[i]))
1370                         break;
1371                 if (!tz->trips.active[i].flags.valid)
1372                         break;
1373                 tz->trips.active[i].flags.enabled = 1;
1374                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1375                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1376                             handles[j], &power_state);
1377                         if (result || (power_state != ACPI_STATE_D0)) {
1378                                 tz->trips.active[i].flags.enabled = 0;
1379                                 break;
1380                         }
1381                 }
1382                 tz->state.active |= tz->trips.active[i].flags.enabled;
1383         }
1384
1385         acpi_thermal_check(tz);
1386
1387         return AE_OK;
1388 }
1389
1390 static int __init acpi_thermal_init(void)
1391 {
1392         int result = 0;
1393
1394
1395         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1396         if (!acpi_thermal_dir)
1397                 return -ENODEV;
1398         acpi_thermal_dir->owner = THIS_MODULE;
1399
1400         result = acpi_bus_register_driver(&acpi_thermal_driver);
1401         if (result < 0) {
1402                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1403                 return -ENODEV;
1404         }
1405
1406         return 0;
1407 }
1408
1409 static void __exit acpi_thermal_exit(void)
1410 {
1411
1412         acpi_bus_unregister_driver(&acpi_thermal_driver);
1413
1414         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1415
1416         return;
1417 }
1418
1419 module_init(acpi_thermal_init);
1420 module_exit(acpi_thermal_exit);