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   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/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         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));
 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), (HZ * sleep_time) / 1000);
 762                 else {
 763                         tz->timer.data = (unsigned long)tz;
 764                         tz->timer.function = acpi_thermal_run;
 765                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 766                         add_timer(&(tz->timer));
 767                 }
 768         }
 769
 770         return;
 771 }
 772
 773 /* --------------------------------------------------------------------------
 774                               FS Interface (/proc)
 775    -------------------------------------------------------------------------- */
 776
 777 static struct proc_dir_entry *acpi_thermal_dir;
 778
 779 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 780 {
 781         struct acpi_thermal *tz = seq->private;
 782
 783
 784         if (!tz)
 785                 goto end;
 786
 787         seq_puts(seq, "state:                   ");
 788
 789         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 790             && !tz->state.active)
 791                 seq_puts(seq, "ok\n");
 792         else {
 793                 if (tz->state.critical)
 794                         seq_puts(seq, "critical ");
 795                 if (tz->state.hot)
 796                         seq_puts(seq, "hot ");
 797                 if (tz->state.passive)
 798                         seq_puts(seq, "passive ");
 799                 if (tz->state.active)
 800                         seq_printf(seq, "active[%d]", tz->state.active_index);
 801                 seq_puts(seq, "\n");
 802         }
 803
 804       end:
 805         return 0;
 806 }
 807
 808 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 809 {
 810         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 811 }
 812
 813 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 814 {
 815         int result = 0;
 816         struct acpi_thermal *tz = seq->private;
 817
 818
 819         if (!tz)
 820                 goto end;
 821
 822         result = acpi_thermal_get_temperature(tz);
 823         if (result)
 824                 goto end;
 825
 826         seq_printf(seq, "temperature:             %ld C\n",
 827                    KELVIN_TO_CELSIUS(tz->temperature));
 828
 829       end:
 830         return 0;
 831 }
 832
 833 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 834 {
 835         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 836 }
 837
 838 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 839 {
 840         struct acpi_thermal *tz = seq->private;
 841         int i = 0;
 842         int j = 0;
 843
 844
 845         if (!tz)
 846                 goto end;
 847
 848         if (tz->trips.critical.flags.valid)
 849                 seq_printf(seq, "critical (S5):           %ld C\n",
 850                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 851
 852         if (tz->trips.hot.flags.valid)
 853                 seq_printf(seq, "hot (S4):                %ld C\n",
 854                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 855
 856         if (tz->trips.passive.flags.valid) {
 857                 seq_printf(seq,
 858                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 859                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 860                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 861                            tz->trips.passive.tsp);
 862                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 863
 864                         seq_printf(seq, "0x%p ",
 865                                    tz->trips.passive.devices.handles[j]);
 866                 }
 867                 seq_puts(seq, "\n");
 868         }
 869
 870         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 871                 if (!(tz->trips.active[i].flags.valid))
 872                         break;
 873                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 874                            i,
 875                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 876                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 877                         seq_printf(seq, "0x%p ",
 878                                    tz->trips.active[i].devices.handles[j]);
 879                 seq_puts(seq, "\n");
 880         }
 881
 882       end:
 883         return 0;
 884 }
 885
 886 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 887 {
 888         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 889 }
 890
 891 static ssize_t
 892 acpi_thermal_write_trip_points(struct file *file,
 893                                const char __user * buffer,
 894                                size_t count, loff_t * ppos)
 895 {
 896         struct seq_file *m = file->private_data;
 897         struct acpi_thermal *tz = m->private;
 898
 899         char *limit_string;
 900         int num, critical, hot, passive;
 901         int *active;
 902         int i = 0;
 903
 904
 905         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 906         if (!limit_string)
 907                 return -ENOMEM;
 908
 909         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 910         if (!active) {
 911                 kfree(limit_string);
 912                 return -ENOMEM;
 913         }
 914
 915         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 916                 count = -EINVAL;
 917                 goto end;
 918         }
 919
 920         if (copy_from_user(limit_string, buffer, count)) {
 921                 count = -EFAULT;
 922                 goto end;
 923         }
 924
 925         limit_string[count] = '\0';
 926
 927         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 928                      &critical, &hot, &passive,
 929                      &active[0], &active[1], &active[2], &active[3], &active[4],
 930                      &active[5], &active[6], &active[7], &active[8],
 931                      &active[9]);
 932         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 933                 count = -EINVAL;
 934                 goto end;
 935         }
 936
 937         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 938         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 939         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 940         for (i = 0; i < num - 3; i++) {
 941                 if (!(tz->trips.active[i].flags.valid))
 942                         break;
 943                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 944         }
 945
 946       end:
 947         kfree(active);
 948         kfree(limit_string);
 949         return count;
 950 }
 951
 952 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 953 {
 954         struct acpi_thermal *tz = seq->private;
 955
 956
 957         if (!tz)
 958                 goto end;
 959
 960         if (!tz->flags.cooling_mode) {
 961                 seq_puts(seq, "<setting not supported>\n");
 962         }
 963
 964         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
 965                 seq_printf(seq, "cooling mode:  critical\n");
 966         else
 967                 seq_printf(seq, "cooling mode:  %s\n",
 968                            tz->cooling_mode ? "passive" : "active");
 969
 970       end:
 971         return 0;
 972 }
 973
 974 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 975 {
 976         return single_open(file, acpi_thermal_cooling_seq_show,
 977                            PDE(inode)->data);
 978 }
 979
 980 static ssize_t
 981 acpi_thermal_write_cooling_mode(struct file *file,
 982                                 const char __user * buffer,
 983                                 size_t count, loff_t * ppos)
 984 {
 985         struct seq_file *m = file->private_data;
 986         struct acpi_thermal *tz = m->private;
 987         int result = 0;
 988         char mode_string[12] = { '\0' };
 989
 990
 991         if (!tz || (count > sizeof(mode_string) - 1))
 992                 return -EINVAL;
 993
 994         if (!tz->flags.cooling_mode)
 995                 return -ENODEV;
 996
 997         if (copy_from_user(mode_string, buffer, count))
 998                 return -EFAULT;
 999
1000         mode_string[count] = '\0';
1001
1002         result = acpi_thermal_set_cooling_mode(tz,
1003                                                simple_strtoul(mode_string, NULL,
1004                                                               0));
1005         if (result)
1006                 return result;
1007
1008         acpi_thermal_check(tz);
1009
1010         return count;
1011 }
1012
1013 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1014 {
1015         struct acpi_thermal *tz = seq->private;
1016
1017
1018         if (!tz)
1019                 goto end;
1020
1021         if (!tz->polling_frequency) {
1022                 seq_puts(seq, "<polling disabled>\n");
1023                 goto end;
1024         }
1025
1026         seq_printf(seq, "polling frequency:       %lu seconds\n",
1027                    (tz->polling_frequency / 10));
1028
1029       end:
1030         return 0;
1031 }
1032
1033 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1034 {
1035         return single_open(file, acpi_thermal_polling_seq_show,
1036                            PDE(inode)->data);
1037 }
1038
1039 static ssize_t
1040 acpi_thermal_write_polling(struct file *file,
1041                            const char __user * buffer,
1042                            size_t count, loff_t * ppos)
1043 {
1044         struct seq_file *m = file->private_data;
1045         struct acpi_thermal *tz = m->private;
1046         int result = 0;
1047         char polling_string[12] = { '\0' };
1048         int seconds = 0;
1049
1050
1051         if (!tz || (count > sizeof(polling_string) - 1))
1052                 return -EINVAL;
1053
1054         if (copy_from_user(polling_string, buffer, count))
1055                 return -EFAULT;
1056
1057         polling_string[count] = '\0';
1058
1059         seconds = simple_strtoul(polling_string, NULL, 0);
1060
1061         result = acpi_thermal_set_polling(tz, seconds);
1062         if (result)
1063                 return result;
1064
1065         acpi_thermal_check(tz);
1066
1067         return count;
1068 }
1069
1070 static int acpi_thermal_add_fs(struct acpi_device *device)
1071 {
1072         struct proc_dir_entry *entry = NULL;
1073
1074
1075         if (!acpi_device_dir(device)) {
1076                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1077                                                      acpi_thermal_dir);
1078                 if (!acpi_device_dir(device))
1079                         return -ENODEV;
1080                 acpi_device_dir(device)->owner = THIS_MODULE;
1081         }
1082
1083         /* 'state' [R] */
1084         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1085                                   S_IRUGO, acpi_device_dir(device));
1086         if (!entry)
1087                 return -ENODEV;
1088         else {
1089                 entry->proc_fops = &acpi_thermal_state_fops;
1090                 entry->data = acpi_driver_data(device);
1091                 entry->owner = THIS_MODULE;
1092         }
1093
1094         /* 'temperature' [R] */
1095         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1096                                   S_IRUGO, acpi_device_dir(device));
1097         if (!entry)
1098                 return -ENODEV;
1099         else {
1100                 entry->proc_fops = &acpi_thermal_temp_fops;
1101                 entry->data = acpi_driver_data(device);
1102                 entry->owner = THIS_MODULE;
1103         }
1104
1105         /* 'trip_points' [R/W] */
1106         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1107                                   S_IFREG | S_IRUGO | S_IWUSR,
1108                                   acpi_device_dir(device));
1109         if (!entry)
1110                 return -ENODEV;
1111         else {
1112                 entry->proc_fops = &acpi_thermal_trip_fops;
1113                 entry->data = acpi_driver_data(device);
1114                 entry->owner = THIS_MODULE;
1115         }
1116
1117         /* 'cooling_mode' [R/W] */
1118         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1119                                   S_IFREG | S_IRUGO | S_IWUSR,
1120                                   acpi_device_dir(device));
1121         if (!entry)
1122                 return -ENODEV;
1123         else {
1124                 entry->proc_fops = &acpi_thermal_cooling_fops;
1125                 entry->data = acpi_driver_data(device);
1126                 entry->owner = THIS_MODULE;
1127         }
1128
1129         /* 'polling_frequency' [R/W] */
1130         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1131                                   S_IFREG | S_IRUGO | S_IWUSR,
1132                                   acpi_device_dir(device));
1133         if (!entry)
1134                 return -ENODEV;
1135         else {
1136                 entry->proc_fops = &acpi_thermal_polling_fops;
1137                 entry->data = acpi_driver_data(device);
1138                 entry->owner = THIS_MODULE;
1139         }
1140
1141         return 0;
1142 }
1143
1144 static int acpi_thermal_remove_fs(struct acpi_device *device)
1145 {
1146
1147         if (acpi_device_dir(device)) {
1148                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149                                   acpi_device_dir(device));
1150                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1151                                   acpi_device_dir(device));
1152                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1153                                   acpi_device_dir(device));
1154                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1155                                   acpi_device_dir(device));
1156                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1157                                   acpi_device_dir(device));
1158                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1159                 acpi_device_dir(device) = NULL;
1160         }
1161
1162         return 0;
1163 }
1164
1165 /* --------------------------------------------------------------------------
1166                                  Driver Interface
1167    -------------------------------------------------------------------------- */
1168
1169 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1170 {
1171         struct acpi_thermal *tz = data;
1172         struct acpi_device *device = NULL;
1173
1174
1175         if (!tz)
1176                 return;
1177
1178         device = tz->device;
1179
1180         switch (event) {
1181         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1182                 acpi_thermal_check(tz);
1183                 break;
1184         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1185                 acpi_thermal_get_trip_points(tz);
1186                 acpi_thermal_check(tz);
1187                 acpi_bus_generate_event(device, event, 0);
1188                 break;
1189         case ACPI_THERMAL_NOTIFY_DEVICES:
1190                 if (tz->flags.devices)
1191                         acpi_thermal_get_devices(tz);
1192                 acpi_bus_generate_event(device, event, 0);
1193                 break;
1194         default:
1195                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1196                                   "Unsupported event [0x%x]\n", event));
1197                 break;
1198         }
1199
1200         return;
1201 }
1202
1203 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1204 {
1205         int result = 0;
1206
1207
1208         if (!tz)
1209                 return -EINVAL;
1210
1211         /* Get temperature [_TMP] (required) */
1212         result = acpi_thermal_get_temperature(tz);
1213         if (result)
1214                 return result;
1215
1216         /* Get trip points [_CRT, _PSV, etc.] (required) */
1217         result = acpi_thermal_get_trip_points(tz);
1218         if (result)
1219                 return result;
1220
1221         /* Set the cooling mode [_SCP] to active cooling (default) */
1222         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1223         if (!result)
1224                 tz->flags.cooling_mode = 1;
1225         else {
1226                 /* Oh,we have not _SCP method.
1227                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1228                 tz->flags.cooling_mode = 0;
1229                 if (tz->trips.active[0].flags.valid
1230                     && tz->trips.passive.flags.valid) {
1231                         if (tz->trips.passive.temperature >
1232                             tz->trips.active[0].temperature)
1233                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1234                         else
1235                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1236                 } else if (!tz->trips.active[0].flags.valid
1237                            && tz->trips.passive.flags.valid) {
1238                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1239                 } else if (tz->trips.active[0].flags.valid
1240                            && !tz->trips.passive.flags.valid) {
1241                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1242                 } else {
1243                         /* _ACx and _PSV are optional, but _CRT is required */
1244                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1245                 }
1246         }
1247
1248         /* Get default polling frequency [_TZP] (optional) */
1249         if (tzp)
1250                 tz->polling_frequency = tzp;
1251         else
1252                 acpi_thermal_get_polling_frequency(tz);
1253
1254         /* Get devices in this thermal zone [_TZD] (optional) */
1255         result = acpi_thermal_get_devices(tz);
1256         if (!result)
1257                 tz->flags.devices = 1;
1258
1259         return 0;
1260 }
1261
1262 static int acpi_thermal_add(struct acpi_device *device)
1263 {
1264         int result = 0;
1265         acpi_status status = AE_OK;
1266         struct acpi_thermal *tz = NULL;
1267
1268
1269         if (!device)
1270                 return -EINVAL;
1271
1272         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1273         if (!tz)
1274                 return -ENOMEM;
1275
1276         tz->device = device;
1277         strcpy(tz->name, device->pnp.bus_id);
1278         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1279         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1280         acpi_driver_data(device) = tz;
1281
1282         result = acpi_thermal_get_info(tz);
1283         if (result)
1284                 goto end;
1285
1286         result = acpi_thermal_add_fs(device);
1287         if (result)
1288                 goto end;
1289
1290         init_timer(&tz->timer);
1291
1292         acpi_thermal_check(tz);
1293
1294         status = acpi_install_notify_handler(device->handle,
1295                                              ACPI_DEVICE_NOTIFY,
1296                                              acpi_thermal_notify, tz);
1297         if (ACPI_FAILURE(status)) {
1298                 result = -ENODEV;
1299                 goto end;
1300         }
1301
1302         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1303                acpi_device_name(device), acpi_device_bid(device),
1304                KELVIN_TO_CELSIUS(tz->temperature));
1305
1306       end:
1307         if (result) {
1308                 acpi_thermal_remove_fs(device);
1309                 kfree(tz);
1310         }
1311
1312         return result;
1313 }
1314
1315 static int acpi_thermal_remove(struct acpi_device *device, int type)
1316 {
1317         acpi_status status = AE_OK;
1318         struct acpi_thermal *tz = NULL;
1319
1320
1321         if (!device || !acpi_driver_data(device))
1322                 return -EINVAL;
1323
1324         tz = acpi_driver_data(device);
1325
1326         /* avoid timer adding new defer task */
1327         tz->zombie = 1;
1328         /* wait for running timer (on other CPUs) finish */
1329         del_timer_sync(&(tz->timer));
1330         /* synchronize deferred task */
1331         acpi_os_wait_events_complete(NULL);
1332         /* deferred task may reinsert timer */
1333         del_timer_sync(&(tz->timer));
1334
1335         status = acpi_remove_notify_handler(device->handle,
1336                                             ACPI_DEVICE_NOTIFY,
1337                                             acpi_thermal_notify);
1338
1339         /* Terminate policy */
1340         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1341                 tz->trips.passive.flags.enabled = 0;
1342                 acpi_thermal_passive(tz);
1343         }
1344         if (tz->trips.active[0].flags.valid
1345             && tz->trips.active[0].flags.enabled) {
1346                 tz->trips.active[0].flags.enabled = 0;
1347                 acpi_thermal_active(tz);
1348         }
1349
1350         acpi_thermal_remove_fs(device);
1351
1352         kfree(tz);
1353         return 0;
1354 }
1355
1356 static int acpi_thermal_resume(struct acpi_device *device, int state)
1357 {
1358         struct acpi_thermal *tz = NULL;
1359         int i;
1360
1361         if (!device || !acpi_driver_data(device))
1362                 return -EINVAL;
1363
1364         tz = acpi_driver_data(device);
1365
1366         acpi_thermal_get_temperature(tz);
1367
1368         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1369                 if (tz->trips.active[i].flags.valid) {
1370                         tz->temperature = tz->trips.active[i].temperature;
1371                         tz->trips.active[i].flags.enabled = 0;
1372
1373                         acpi_thermal_active(tz);
1374
1375                         tz->state.active |= tz->trips.active[i].flags.enabled;
1376                         tz->state.active_index = i;
1377                 }
1378         }
1379
1380         acpi_thermal_check(tz);
1381
1382         return AE_OK;
1383 }
1384
1385 static int __init acpi_thermal_init(void)
1386 {
1387         int result = 0;
1388
1389
1390         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1391         if (!acpi_thermal_dir)
1392                 return -ENODEV;
1393         acpi_thermal_dir->owner = THIS_MODULE;
1394
1395         result = acpi_bus_register_driver(&acpi_thermal_driver);
1396         if (result < 0) {
1397                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1398                 return -ENODEV;
1399         }
1400
1401         return 0;
1402 }
1403
1404 static void __exit acpi_thermal_exit(void)
1405 {
1406
1407         acpi_bus_unregister_driver(&acpi_thermal_driver);
1408
1409         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1410
1411         return;
1412 }
1413
1414 module_init(acpi_thermal_init);
1415 module_exit(acpi_thermal_exit);