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_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("acpi_thermal")
  74
  75 MODULE_AUTHOR("Paul Diefenbaugh");
  76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  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, int state);
  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 = ACPI_THERMAL_DRIVER_NAME,
 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         acpi_handle handle;
 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 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 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 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 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 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->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->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));
 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->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->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->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->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->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->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->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->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->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->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->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         int result = 0;
 457         struct acpi_device *device = NULL;
 458
 459
 460         if (!tz || !tz->trips.critical.flags.valid)
 461                 return -EINVAL;
 462
 463         if (tz->temperature >= tz->trips.critical.temperature) {
 464                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 465                 tz->trips.critical.flags.enabled = 1;
 466         } else if (tz->trips.critical.flags.enabled)
 467                 tz->trips.critical.flags.enabled = 0;
 468
 469         result = acpi_bus_get_device(tz->handle, &device);
 470         if (result)
 471                 return result;
 472
 473         printk(KERN_EMERG
 474                "Critical temperature reached (%ld C), shutting down.\n",
 475                KELVIN_TO_CELSIUS(tz->temperature));
 476         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
 477                                 tz->trips.critical.flags.enabled);
 478
 479         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 480
 481         return 0;
 482 }
 483
 484 static int acpi_thermal_hot(struct acpi_thermal *tz)
 485 {
 486         int result = 0;
 487         struct acpi_device *device = NULL;
 488
 489
 490         if (!tz || !tz->trips.hot.flags.valid)
 491                 return -EINVAL;
 492
 493         if (tz->temperature >= tz->trips.hot.temperature) {
 494                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 495                 tz->trips.hot.flags.enabled = 1;
 496         } else if (tz->trips.hot.flags.enabled)
 497                 tz->trips.hot.flags.enabled = 0;
 498
 499         result = acpi_bus_get_device(tz->handle, &device);
 500         if (result)
 501                 return result;
 502
 503         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
 504                                 tz->trips.hot.flags.enabled);
 505
 506         /* TBD: Call user-mode "sleep(S4)" function */
 507
 508         return 0;
 509 }
 510
 511 static void acpi_thermal_passive(struct acpi_thermal *tz)
 512 {
 513         int result = 1;
 514         struct acpi_thermal_passive *passive = NULL;
 515         int trend = 0;
 516         int i = 0;
 517
 518
 519         if (!tz || !tz->trips.passive.flags.valid)
 520                 return;
 521
 522         passive = &(tz->trips.passive);
 523
 524         /*
 525          * Above Trip?
 526          * -----------
 527          * Calculate the thermal trend (using the passive cooling equation)
 528          * and modify the performance limit for all passive cooling devices
 529          * accordingly.  Note that we assume symmetry.
 530          */
 531         if (tz->temperature >= passive->temperature) {
 532                 trend =
 533                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 534                     (passive->tc2 * (tz->temperature - passive->temperature));
 535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 536                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 537                                   trend, passive->tc1, tz->temperature,
 538                                   tz->last_temperature, passive->tc2,
 539                                   tz->temperature, passive->temperature));
 540                 passive->flags.enabled = 1;
 541                 /* Heating up? */
 542                 if (trend > 0)
 543                         for (i = 0; i < passive->devices.count; i++)
 544                                 acpi_processor_set_thermal_limit(passive->
 545                                                                  devices.
 546                                                                  handles[i],
 547                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 548                 /* Cooling off? */
 549                 else if (trend < 0) {
 550                         for (i = 0; i < passive->devices.count; i++)
 551                                 /*
 552                                  * assume that we are on highest
 553                                  * freq/lowest thrott and can leave
 554                                  * passive mode, even in error case
 555                                  */
 556                                 if (!acpi_processor_set_thermal_limit
 557                                     (passive->devices.handles[i],
 558                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 559                                         result = 0;
 560                         /*
 561                          * Leave cooling mode, even if the temp might
 562                          * higher than trip point This is because some
 563                          * machines might have long thermal polling
 564                          * frequencies (tsp) defined. We will fall back
 565                          * into passive mode in next cycle (probably quicker)
 566                          */
 567                         if (result) {
 568                                 passive->flags.enabled = 0;
 569                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 570                                                   "Disabling passive cooling, still above threshold,"
 571                                                   " but we are cooling down\n"));
 572                         }
 573                 }
 574                 return;
 575         }
 576
 577         /*
 578          * Below Trip?
 579          * -----------
 580          * Implement passive cooling hysteresis to slowly increase performance
 581          * and avoid thrashing around the passive trip point.  Note that we
 582          * assume symmetry.
 583          */
 584         if (!passive->flags.enabled)
 585                 return;
 586         for (i = 0; i < passive->devices.count; i++)
 587                 if (!acpi_processor_set_thermal_limit
 588                     (passive->devices.handles[i],
 589                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 590                         result = 0;
 591         if (result) {
 592                 passive->flags.enabled = 0;
 593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 594                                   "Disabling passive cooling (zone is cool)\n"));
 595         }
 596 }
 597
 598 static void acpi_thermal_active(struct acpi_thermal *tz)
 599 {
 600         int result = 0;
 601         struct acpi_thermal_active *active = NULL;
 602         int i = 0;
 603         int j = 0;
 604         unsigned long maxtemp = 0;
 605
 606
 607         if (!tz)
 608                 return;
 609
 610         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 611                 active = &(tz->trips.active[i]);
 612                 if (!active || !active->flags.valid)
 613                         break;
 614                 if (tz->temperature >= active->temperature) {
 615                         /*
 616                          * Above Threshold?
 617                          * ----------------
 618                          * If not already enabled, turn ON all cooling devices
 619                          * associated with this active threshold.
 620                          */
 621                         if (active->temperature > maxtemp)
 622                                 tz->state.active_index = i;
 623                         maxtemp = active->temperature;
 624                         if (active->flags.enabled)
 625                                 continue;
 626                         for (j = 0; j < active->devices.count; j++) {
 627                                 result =
 628                                     acpi_bus_set_power(active->devices.
 629                                                        handles[j],
 630                                                        ACPI_STATE_D0);
 631                                 if (result) {
 632                                         printk(KERN_WARNING PREFIX
 633                                                       "Unable to turn cooling device [%p] 'on'\n",
 634                                                       active->devices.
 635                                                       handles[j]);
 636                                         continue;
 637                                 }
 638                                 active->flags.enabled = 1;
 639                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 640                                                   "Cooling device [%p] now 'on'\n",
 641                                                   active->devices.handles[j]));
 642                         }
 643                         continue;
 644                 }
 645                 if (!active->flags.enabled)
 646                         continue;
 647                 /*
 648                  * Below Threshold?
 649                  * ----------------
 650                  * Turn OFF all cooling devices associated with this
 651                  * threshold.
 652                  */
 653                 for (j = 0; j < active->devices.count; j++) {
 654                         result = acpi_bus_set_power(active->devices.handles[j],
 655                                                     ACPI_STATE_D3);
 656                         if (result) {
 657                                 printk(KERN_WARNING PREFIX
 658                                               "Unable to turn cooling device [%p] 'off'\n",
 659                                               active->devices.handles[j]);
 660                                 continue;
 661                         }
 662                         active->flags.enabled = 0;
 663                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 664                                           "Cooling device [%p] now 'off'\n",
 665                                           active->devices.handles[j]));
 666                 }
 667         }
 668 }
 669
 670 static void acpi_thermal_check(void *context);
 671
 672 static void acpi_thermal_run(unsigned long data)
 673 {
 674         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 675         if (!tz->zombie)
 676                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 677 }
 678
 679 static void acpi_thermal_check(void *data)
 680 {
 681         int result = 0;
 682         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 683         unsigned long sleep_time = 0;
 684         int i = 0;
 685         struct acpi_thermal_state state;
 686
 687
 688         if (!tz) {
 689                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 690                 return;
 691         }
 692
 693         state = tz->state;
 694
 695         result = acpi_thermal_get_temperature(tz);
 696         if (result)
 697                 return;
 698
 699         memset(&tz->state, 0, sizeof(tz->state));
 700
 701         /*
 702          * Check Trip Points
 703          * -----------------
 704          * Compare the current temperature to the trip point values to see
 705          * if we've entered one of the thermal policy states.  Note that
 706          * this function determines when a state is entered, but the
 707          * individual policy decides when it is exited (e.g. hysteresis).
 708          */
 709         if (tz->trips.critical.flags.valid)
 710                 state.critical |=
 711                     (tz->temperature >= tz->trips.critical.temperature);
 712         if (tz->trips.hot.flags.valid)
 713                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 714         if (tz->trips.passive.flags.valid)
 715                 state.passive |=
 716                     (tz->temperature >= tz->trips.passive.temperature);
 717         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 718                 if (tz->trips.active[i].flags.valid)
 719                         state.active |=
 720                             (tz->temperature >=
 721                              tz->trips.active[i].temperature);
 722
 723         /*
 724          * Invoke Policy
 725          * -------------
 726          * Separated from the above check to allow individual policy to
 727          * determine when to exit a given state.
 728          */
 729         if (state.critical)
 730                 acpi_thermal_critical(tz);
 731         if (state.hot)
 732                 acpi_thermal_hot(tz);
 733         if (state.passive)
 734                 acpi_thermal_passive(tz);
 735         if (state.active)
 736                 acpi_thermal_active(tz);
 737
 738         /*
 739          * Calculate State
 740          * ---------------
 741          * Again, separated from the above two to allow independent policy
 742          * decisions.
 743          */
 744         tz->state.critical = tz->trips.critical.flags.enabled;
 745         tz->state.hot = tz->trips.hot.flags.enabled;
 746         tz->state.passive = tz->trips.passive.flags.enabled;
 747         tz->state.active = 0;
 748         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 749                 tz->state.active |= tz->trips.active[i].flags.enabled;
 750
 751         /*
 752          * Calculate Sleep Time
 753          * --------------------
 754          * If we're in the passive state, use _TSP's value.  Otherwise
 755          * use the default polling frequency (e.g. _TZP).  If no polling
 756          * frequency is specified then we'll wait forever (at least until
 757          * a thermal event occurs).  Note that _TSP and _TZD values are
 758          * given in 1/10th seconds (we must covert to milliseconds).
 759          */
 760         if (tz->state.passive)
 761                 sleep_time = tz->trips.passive.tsp * 100;
 762         else if (tz->polling_frequency > 0)
 763                 sleep_time = tz->polling_frequency * 100;
 764
 765         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 766                           tz->name, tz->temperature, sleep_time));
 767
 768         /*
 769          * Schedule Next Poll
 770          * ------------------
 771          */
 772         if (!sleep_time) {
 773                 if (timer_pending(&(tz->timer)))
 774                         del_timer(&(tz->timer));
 775         } else {
 776                 if (timer_pending(&(tz->timer)))
 777                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 778                 else {
 779                         tz->timer.data = (unsigned long)tz;
 780                         tz->timer.function = acpi_thermal_run;
 781                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 782                         add_timer(&(tz->timer));
 783                 }
 784         }
 785
 786         return;
 787 }
 788
 789 /* --------------------------------------------------------------------------
 790                               FS Interface (/proc)
 791    -------------------------------------------------------------------------- */
 792
 793 static struct proc_dir_entry *acpi_thermal_dir;
 794
 795 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 796 {
 797         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 798
 799
 800         if (!tz)
 801                 goto end;
 802
 803         seq_puts(seq, "state:                   ");
 804
 805         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 806             && !tz->state.active)
 807                 seq_puts(seq, "ok\n");
 808         else {
 809                 if (tz->state.critical)
 810                         seq_puts(seq, "critical ");
 811                 if (tz->state.hot)
 812                         seq_puts(seq, "hot ");
 813                 if (tz->state.passive)
 814                         seq_puts(seq, "passive ");
 815                 if (tz->state.active)
 816                         seq_printf(seq, "active[%d]", tz->state.active_index);
 817                 seq_puts(seq, "\n");
 818         }
 819
 820       end:
 821         return 0;
 822 }
 823
 824 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 825 {
 826         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 827 }
 828
 829 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 830 {
 831         int result = 0;
 832         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 833
 834
 835         if (!tz)
 836                 goto end;
 837
 838         result = acpi_thermal_get_temperature(tz);
 839         if (result)
 840                 goto end;
 841
 842         seq_printf(seq, "temperature:             %ld C\n",
 843                    KELVIN_TO_CELSIUS(tz->temperature));
 844
 845       end:
 846         return 0;
 847 }
 848
 849 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 850 {
 851         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 852 }
 853
 854 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 855 {
 856         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 857         int i = 0;
 858         int j = 0;
 859
 860
 861         if (!tz)
 862                 goto end;
 863
 864         if (tz->trips.critical.flags.valid)
 865                 seq_printf(seq, "critical (S5):           %ld C\n",
 866                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 867
 868         if (tz->trips.hot.flags.valid)
 869                 seq_printf(seq, "hot (S4):                %ld C\n",
 870                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 871
 872         if (tz->trips.passive.flags.valid) {
 873                 seq_printf(seq,
 874                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 875                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 876                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 877                            tz->trips.passive.tsp);
 878                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 879
 880                         seq_printf(seq, "0x%p ",
 881                                    tz->trips.passive.devices.handles[j]);
 882                 }
 883                 seq_puts(seq, "\n");
 884         }
 885
 886         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 887                 if (!(tz->trips.active[i].flags.valid))
 888                         break;
 889                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 890                            i,
 891                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 892                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 893                         seq_printf(seq, "0x%p ",
 894                                    tz->trips.active[i].devices.handles[j]);
 895                 seq_puts(seq, "\n");
 896         }
 897
 898       end:
 899         return 0;
 900 }
 901
 902 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 903 {
 904         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 905 }
 906
 907 static ssize_t
 908 acpi_thermal_write_trip_points(struct file *file,
 909                                const char __user * buffer,
 910                                size_t count, loff_t * ppos)
 911 {
 912         struct seq_file *m = (struct seq_file *)file->private_data;
 913         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
 914
 915         char *limit_string;
 916         int num, critical, hot, passive;
 917         int *active;
 918         int i = 0;
 919
 920
 921         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 922         if (!limit_string)
 923                 return -ENOMEM;
 924
 925         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 926
 927         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 928         if (!active) {
 929                 kfree(limit_string);
 930                 return -ENOMEM;
 931         }
 932
 933         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 934                 count = -EINVAL;
 935                 goto end;
 936         }
 937
 938         if (copy_from_user(limit_string, buffer, count)) {
 939                 count = -EFAULT;
 940                 goto end;
 941         }
 942
 943         limit_string[count] = '\0';
 944
 945         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 946                      &critical, &hot, &passive,
 947                      &active[0], &active[1], &active[2], &active[3], &active[4],
 948                      &active[5], &active[6], &active[7], &active[8],
 949                      &active[9]);
 950         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 951                 count = -EINVAL;
 952                 goto end;
 953         }
 954
 955         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 956         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 957         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 958         for (i = 0; i < num - 3; i++) {
 959                 if (!(tz->trips.active[i].flags.valid))
 960                         break;
 961                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 962         }
 963
 964       end:
 965         kfree(active);
 966         kfree(limit_string);
 967         return count;
 968 }
 969
 970 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 971 {
 972         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 973
 974
 975         if (!tz)
 976                 goto end;
 977
 978         if (!tz->flags.cooling_mode) {
 979                 seq_puts(seq, "<setting not supported>\n");
 980         }
 981
 982         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 983                 seq_printf(seq, "cooling mode:  critical\n");
 984         else
 985                 seq_printf(seq, "cooling mode:  %s\n",
 986                            tz->cooling_mode ? "passive" : "active");
 987
 988       end:
 989         return 0;
 990 }
 991
 992 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 993 {
 994         return single_open(file, acpi_thermal_cooling_seq_show,
 995                            PDE(inode)->data);
 996 }
 997
 998 static ssize_t
 999 acpi_thermal_write_cooling_mode(struct file *file,
1000                                 const char __user * buffer,
1001                                 size_t count, loff_t * ppos)
1002 {
1003         struct seq_file *m = (struct seq_file *)file->private_data;
1004         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1005         int result = 0;
1006         char mode_string[12] = { '\0' };
1007
1008
1009         if (!tz || (count > sizeof(mode_string) - 1))
1010                 return -EINVAL;
1011
1012         if (!tz->flags.cooling_mode)
1013                 return -ENODEV;
1014
1015         if (copy_from_user(mode_string, buffer, count))
1016                 return -EFAULT;
1017
1018         mode_string[count] = '\0';
1019
1020         result = acpi_thermal_set_cooling_mode(tz,
1021                                                simple_strtoul(mode_string, NULL,
1022                                                               0));
1023         if (result)
1024                 return result;
1025
1026         acpi_thermal_check(tz);
1027
1028         return count;
1029 }
1030
1031 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1032 {
1033         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1034
1035
1036         if (!tz)
1037                 goto end;
1038
1039         if (!tz->polling_frequency) {
1040                 seq_puts(seq, "<polling disabled>\n");
1041                 goto end;
1042         }
1043
1044         seq_printf(seq, "polling frequency:       %lu seconds\n",
1045                    (tz->polling_frequency / 10));
1046
1047       end:
1048         return 0;
1049 }
1050
1051 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1052 {
1053         return single_open(file, acpi_thermal_polling_seq_show,
1054                            PDE(inode)->data);
1055 }
1056
1057 static ssize_t
1058 acpi_thermal_write_polling(struct file *file,
1059                            const char __user * buffer,
1060                            size_t count, loff_t * ppos)
1061 {
1062         struct seq_file *m = (struct seq_file *)file->private_data;
1063         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1064         int result = 0;
1065         char polling_string[12] = { '\0' };
1066         int seconds = 0;
1067
1068
1069         if (!tz || (count > sizeof(polling_string) - 1))
1070                 return -EINVAL;
1071
1072         if (copy_from_user(polling_string, buffer, count))
1073                 return -EFAULT;
1074
1075         polling_string[count] = '\0';
1076
1077         seconds = simple_strtoul(polling_string, NULL, 0);
1078
1079         result = acpi_thermal_set_polling(tz, seconds);
1080         if (result)
1081                 return result;
1082
1083         acpi_thermal_check(tz);
1084
1085         return count;
1086 }
1087
1088 static int acpi_thermal_add_fs(struct acpi_device *device)
1089 {
1090         struct proc_dir_entry *entry = NULL;
1091
1092
1093         if (!acpi_device_dir(device)) {
1094                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1095                                                      acpi_thermal_dir);
1096                 if (!acpi_device_dir(device))
1097                         return -ENODEV;
1098                 acpi_device_dir(device)->owner = THIS_MODULE;
1099         }
1100
1101         /* 'state' [R] */
1102         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1103                                   S_IRUGO, acpi_device_dir(device));
1104         if (!entry)
1105                 return -ENODEV;
1106         else {
1107                 entry->proc_fops = &acpi_thermal_state_fops;
1108                 entry->data = acpi_driver_data(device);
1109                 entry->owner = THIS_MODULE;
1110         }
1111
1112         /* 'temperature' [R] */
1113         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1114                                   S_IRUGO, acpi_device_dir(device));
1115         if (!entry)
1116                 return -ENODEV;
1117         else {
1118                 entry->proc_fops = &acpi_thermal_temp_fops;
1119                 entry->data = acpi_driver_data(device);
1120                 entry->owner = THIS_MODULE;
1121         }
1122
1123         /* 'trip_points' [R/W] */
1124         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1125                                   S_IFREG | S_IRUGO | S_IWUSR,
1126                                   acpi_device_dir(device));
1127         if (!entry)
1128                 return -ENODEV;
1129         else {
1130                 entry->proc_fops = &acpi_thermal_trip_fops;
1131                 entry->data = acpi_driver_data(device);
1132                 entry->owner = THIS_MODULE;
1133         }
1134
1135         /* 'cooling_mode' [R/W] */
1136         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1137                                   S_IFREG | S_IRUGO | S_IWUSR,
1138                                   acpi_device_dir(device));
1139         if (!entry)
1140                 return -ENODEV;
1141         else {
1142                 entry->proc_fops = &acpi_thermal_cooling_fops;
1143                 entry->data = acpi_driver_data(device);
1144                 entry->owner = THIS_MODULE;
1145         }
1146
1147         /* 'polling_frequency' [R/W] */
1148         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149                                   S_IFREG | S_IRUGO | S_IWUSR,
1150                                   acpi_device_dir(device));
1151         if (!entry)
1152                 return -ENODEV;
1153         else {
1154                 entry->proc_fops = &acpi_thermal_polling_fops;
1155                 entry->data = acpi_driver_data(device);
1156                 entry->owner = THIS_MODULE;
1157         }
1158
1159         return 0;
1160 }
1161
1162 static int acpi_thermal_remove_fs(struct acpi_device *device)
1163 {
1164
1165         if (acpi_device_dir(device)) {
1166                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1167                                   acpi_device_dir(device));
1168                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1169                                   acpi_device_dir(device));
1170                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1171                                   acpi_device_dir(device));
1172                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1173                                   acpi_device_dir(device));
1174                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1175                                   acpi_device_dir(device));
1176                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1177                 acpi_device_dir(device) = NULL;
1178         }
1179
1180         return 0;
1181 }
1182
1183 /* --------------------------------------------------------------------------
1184                                  Driver Interface
1185    -------------------------------------------------------------------------- */
1186
1187 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1188 {
1189         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1190         struct acpi_device *device = NULL;
1191
1192
1193         if (!tz)
1194                 return;
1195
1196         if (acpi_bus_get_device(tz->handle, &device))
1197                 return;
1198
1199         switch (event) {
1200         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1201                 acpi_thermal_check(tz);
1202                 break;
1203         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1204                 acpi_thermal_get_trip_points(tz);
1205                 acpi_thermal_check(tz);
1206                 acpi_bus_generate_event(device, event, 0);
1207                 break;
1208         case ACPI_THERMAL_NOTIFY_DEVICES:
1209                 if (tz->flags.devices)
1210                         acpi_thermal_get_devices(tz);
1211                 acpi_bus_generate_event(device, event, 0);
1212                 break;
1213         default:
1214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1215                                   "Unsupported event [0x%x]\n", event));
1216                 break;
1217         }
1218
1219         return;
1220 }
1221
1222 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1223 {
1224         int result = 0;
1225
1226
1227         if (!tz)
1228                 return -EINVAL;
1229
1230         /* Get temperature [_TMP] (required) */
1231         result = acpi_thermal_get_temperature(tz);
1232         if (result)
1233                 return result;
1234
1235         /* Get trip points [_CRT, _PSV, etc.] (required) */
1236         result = acpi_thermal_get_trip_points(tz);
1237         if (result)
1238                 return result;
1239
1240         /* Set the cooling mode [_SCP] to active cooling (default) */
1241         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1242         if (!result)
1243                 tz->flags.cooling_mode = 1;
1244         else {
1245                 /* Oh,we have not _SCP method.
1246                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1247                 tz->flags.cooling_mode = 0;
1248                 if (tz->trips.active[0].flags.valid
1249                     && tz->trips.passive.flags.valid) {
1250                         if (tz->trips.passive.temperature >
1251                             tz->trips.active[0].temperature)
1252                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1253                         else
1254                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1255                 } else if (!tz->trips.active[0].flags.valid
1256                            && tz->trips.passive.flags.valid) {
1257                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1258                 } else if (tz->trips.active[0].flags.valid
1259                            && !tz->trips.passive.flags.valid) {
1260                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1261                 } else {
1262                         /* _ACx and _PSV are optional, but _CRT is required */
1263                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1264                 }
1265         }
1266
1267         /* Get default polling frequency [_TZP] (optional) */
1268         if (tzp)
1269                 tz->polling_frequency = tzp;
1270         else
1271                 acpi_thermal_get_polling_frequency(tz);
1272
1273         /* Get devices in this thermal zone [_TZD] (optional) */
1274         result = acpi_thermal_get_devices(tz);
1275         if (!result)
1276                 tz->flags.devices = 1;
1277
1278         return 0;
1279 }
1280
1281 static int acpi_thermal_add(struct acpi_device *device)
1282 {
1283         int result = 0;
1284         acpi_status status = AE_OK;
1285         struct acpi_thermal *tz = NULL;
1286
1287
1288         if (!device)
1289                 return -EINVAL;
1290
1291         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1292         if (!tz)
1293                 return -ENOMEM;
1294         memset(tz, 0, sizeof(struct acpi_thermal));
1295
1296         tz->handle = device->handle;
1297         strcpy(tz->name, device->pnp.bus_id);
1298         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1299         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1300         acpi_driver_data(device) = tz;
1301
1302         result = acpi_thermal_get_info(tz);
1303         if (result)
1304                 goto end;
1305
1306         result = acpi_thermal_add_fs(device);
1307         if (result)
1308                 goto end;
1309
1310         init_timer(&tz->timer);
1311
1312         acpi_thermal_check(tz);
1313
1314         status = acpi_install_notify_handler(tz->handle,
1315                                              ACPI_DEVICE_NOTIFY,
1316                                              acpi_thermal_notify, tz);
1317         if (ACPI_FAILURE(status)) {
1318                 result = -ENODEV;
1319                 goto end;
1320         }
1321
1322         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1323                acpi_device_name(device), acpi_device_bid(device),
1324                KELVIN_TO_CELSIUS(tz->temperature));
1325
1326       end:
1327         if (result) {
1328                 acpi_thermal_remove_fs(device);
1329                 kfree(tz);
1330         }
1331
1332         return result;
1333 }
1334
1335 static int acpi_thermal_remove(struct acpi_device *device, int type)
1336 {
1337         acpi_status status = AE_OK;
1338         struct acpi_thermal *tz = NULL;
1339
1340
1341         if (!device || !acpi_driver_data(device))
1342                 return -EINVAL;
1343
1344         tz = (struct acpi_thermal *)acpi_driver_data(device);
1345
1346         /* avoid timer adding new defer task */
1347         tz->zombie = 1;
1348         /* wait for running timer (on other CPUs) finish */
1349         del_timer_sync(&(tz->timer));
1350         /* synchronize deferred task */
1351         acpi_os_wait_events_complete(NULL);
1352         /* deferred task may reinsert timer */
1353         del_timer_sync(&(tz->timer));
1354
1355         status = acpi_remove_notify_handler(tz->handle,
1356                                             ACPI_DEVICE_NOTIFY,
1357                                             acpi_thermal_notify);
1358
1359         /* Terminate policy */
1360         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1361                 tz->trips.passive.flags.enabled = 0;
1362                 acpi_thermal_passive(tz);
1363         }
1364         if (tz->trips.active[0].flags.valid
1365             && tz->trips.active[0].flags.enabled) {
1366                 tz->trips.active[0].flags.enabled = 0;
1367                 acpi_thermal_active(tz);
1368         }
1369
1370         acpi_thermal_remove_fs(device);
1371
1372         kfree(tz);
1373         return 0;
1374 }
1375
1376 static int acpi_thermal_resume(struct acpi_device *device, int state)
1377 {
1378         struct acpi_thermal *tz = NULL;
1379
1380         if (!device || !acpi_driver_data(device))
1381                 return -EINVAL;
1382
1383         tz = (struct acpi_thermal *)acpi_driver_data(device);
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);