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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_state_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_trip_points(struct file *,
  89                                               const char __user *, size_t,
  90                                               loff_t *);
  91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  93                                                const char __user *, size_t,
  94                                                loff_t *);
  95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  97                                           size_t, loff_t *);
  98
  99 static struct acpi_driver acpi_thermal_driver = {
 100         .name = ACPI_THERMAL_DRIVER_NAME,
 101         .class = ACPI_THERMAL_CLASS,
 102         .ids = ACPI_THERMAL_HID,
 103         .ops = {
 104                 .add = acpi_thermal_add,
 105                 .remove = acpi_thermal_remove,
 106                 },
 107 };
 108
 109 struct acpi_thermal_state {
 110         u8 critical:1;
 111         u8 hot:1;
 112         u8 passive:1;
 113         u8 active:1;
 114         u8 reserved:4;
 115         int active_index;
 116 };
 117
 118 struct acpi_thermal_state_flags {
 119         u8 valid:1;
 120         u8 enabled:1;
 121         u8 reserved:6;
 122 };
 123
 124 struct acpi_thermal_critical {
 125         struct acpi_thermal_state_flags flags;
 126         unsigned long temperature;
 127 };
 128
 129 struct acpi_thermal_hot {
 130         struct acpi_thermal_state_flags flags;
 131         unsigned long temperature;
 132 };
 133
 134 struct acpi_thermal_passive {
 135         struct acpi_thermal_state_flags flags;
 136         unsigned long temperature;
 137         unsigned long tc1;
 138         unsigned long tc2;
 139         unsigned long tsp;
 140         struct acpi_handle_list devices;
 141 };
 142
 143 struct acpi_thermal_active {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146         struct acpi_handle_list devices;
 147 };
 148
 149 struct acpi_thermal_trips {
 150         struct acpi_thermal_critical critical;
 151         struct acpi_thermal_hot hot;
 152         struct acpi_thermal_passive passive;
 153         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 154 };
 155
 156 struct acpi_thermal_flags {
 157         u8 cooling_mode:1;      /* _SCP */
 158         u8 devices:1;           /* _TZD */
 159         u8 reserved:6;
 160 };
 161
 162 struct acpi_thermal {
 163         acpi_handle handle;
 164         acpi_bus_id name;
 165         unsigned long temperature;
 166         unsigned long last_temperature;
 167         unsigned long polling_frequency;
 168         u8 cooling_mode;
 169         volatile u8 zombie;
 170         struct acpi_thermal_flags flags;
 171         struct acpi_thermal_state state;
 172         struct acpi_thermal_trips trips;
 173         struct acpi_handle_list devices;
 174         struct timer_list timer;
 175 };
 176
 177 static struct file_operations acpi_thermal_state_fops = {
 178         .open = acpi_thermal_state_open_fs,
 179         .read = seq_read,
 180         .llseek = seq_lseek,
 181         .release = single_release,
 182 };
 183
 184 static struct file_operations acpi_thermal_temp_fops = {
 185         .open = acpi_thermal_temp_open_fs,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static struct file_operations acpi_thermal_trip_fops = {
 192         .open = acpi_thermal_trip_open_fs,
 193         .read = seq_read,
 194         .write = acpi_thermal_write_trip_points,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static struct file_operations acpi_thermal_cooling_fops = {
 200         .open = acpi_thermal_cooling_open_fs,
 201         .read = seq_read,
 202         .write = acpi_thermal_write_cooling_mode,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static struct file_operations acpi_thermal_polling_fops = {
 208         .open = acpi_thermal_polling_open_fs,
 209         .read = seq_read,
 210         .write = acpi_thermal_write_polling,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 /* --------------------------------------------------------------------------
 216                              Thermal Zone Management
 217    -------------------------------------------------------------------------- */
 218
 219 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 220 {
 221         acpi_status status = AE_OK;
 222
 223         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 224
 225         if (!tz)
 226                 return_VALUE(-EINVAL);
 227
 228         tz->last_temperature = tz->temperature;
 229
 230         status =
 231             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 232         if (ACPI_FAILURE(status))
 233                 return_VALUE(-ENODEV);
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 236                           tz->temperature));
 237
 238         return_VALUE(0);
 239 }
 240
 241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 246
 247         if (!tz)
 248                 return_VALUE(-EINVAL);
 249
 250         status =
 251             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
 252                                   &tz->polling_frequency);
 253         if (ACPI_FAILURE(status))
 254                 return_VALUE(-ENODEV);
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 257                           tz->polling_frequency));
 258
 259         return_VALUE(0);
 260 }
 261
 262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 263 {
 264         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 265
 266         if (!tz)
 267                 return_VALUE(-EINVAL);
 268
 269         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 272                           "Polling frequency set to %lu seconds\n",
 273                           tz->polling_frequency));
 274
 275         return_VALUE(0);
 276 }
 277
 278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 279 {
 280         acpi_status status = AE_OK;
 281         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 282         struct acpi_object_list arg_list = { 1, &arg0 };
 283         acpi_handle handle = NULL;
 284
 285         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 286
 287         if (!tz)
 288                 return_VALUE(-EINVAL);
 289
 290         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 291         if (ACPI_FAILURE(status)) {
 292                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 293                 return_VALUE(-ENODEV);
 294         }
 295
 296         arg0.integer.value = mode;
 297
 298         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 299         if (ACPI_FAILURE(status))
 300                 return_VALUE(-ENODEV);
 301
 302         tz->cooling_mode = mode;
 303
 304         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 305                           mode ? "passive" : "active"));
 306
 307         return_VALUE(0);
 308 }
 309
 310 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 311 {
 312         acpi_status status = AE_OK;
 313         int i = 0;
 314
 315         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 316
 317         if (!tz)
 318                 return_VALUE(-EINVAL);
 319
 320         /* Critical Shutdown (required) */
 321
 322         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 323                                        &tz->trips.critical.temperature);
 324         if (ACPI_FAILURE(status)) {
 325                 tz->trips.critical.flags.valid = 0;
 326                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 327                 return_VALUE(-ENODEV);
 328         } else {
 329                 tz->trips.critical.flags.valid = 1;
 330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 331                                   "Found critical threshold [%lu]\n",
 332                                   tz->trips.critical.temperature));
 333         }
 334
 335         /* Critical Sleep (optional) */
 336
 337         status =
 338             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
 339                                   &tz->trips.hot.temperature);
 340         if (ACPI_FAILURE(status)) {
 341                 tz->trips.hot.flags.valid = 0;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 343         } else {
 344                 tz->trips.hot.flags.valid = 1;
 345                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 346                                   tz->trips.hot.temperature));
 347         }
 348
 349         /* Passive: Processors (optional) */
 350
 351         status =
 352             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
 353                                   &tz->trips.passive.temperature);
 354         if (ACPI_FAILURE(status)) {
 355                 tz->trips.passive.flags.valid = 0;
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 357         } else {
 358                 tz->trips.passive.flags.valid = 1;
 359
 360                 status =
 361                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
 362                                           &tz->trips.passive.tc1);
 363                 if (ACPI_FAILURE(status))
 364                         tz->trips.passive.flags.valid = 0;
 365
 366                 status =
 367                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
 368                                           &tz->trips.passive.tc2);
 369                 if (ACPI_FAILURE(status))
 370                         tz->trips.passive.flags.valid = 0;
 371
 372                 status =
 373                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
 374                                           &tz->trips.passive.tsp);
 375                 if (ACPI_FAILURE(status))
 376                         tz->trips.passive.flags.valid = 0;
 377
 378                 status =
 379                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
 380                                             &tz->trips.passive.devices);
 381                 if (ACPI_FAILURE(status))
 382                         tz->trips.passive.flags.valid = 0;
 383
 384                 if (!tz->trips.passive.flags.valid)
 385                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 386                                           "Invalid passive threshold\n"));
 387                 else
 388                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 389                                           "Found passive threshold [%lu]\n",
 390                                           tz->trips.passive.temperature));
 391         }
 392
 393         /* Active: Fans, etc. (optional) */
 394
 395         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 396
 397                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 398
 399                 status =
 400                     acpi_evaluate_integer(tz->handle, name, NULL,
 401                                           &tz->trips.active[i].temperature);
 402                 if (ACPI_FAILURE(status))
 403                         break;
 404
 405                 name[2] = 'L';
 406                 status =
 407                     acpi_evaluate_reference(tz->handle, name, NULL,
 408                                             &tz->trips.active[i].devices);
 409                 if (ACPI_SUCCESS(status)) {
 410                         tz->trips.active[i].flags.valid = 1;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                           "Found active threshold [%d]:[%lu]\n",
 413                                           i, tz->trips.active[i].temperature));
 414                 } else
 415                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 416                                           "Invalid active threshold [%d]\n",
 417                                           i));
 418         }
 419
 420         return_VALUE(0);
 421 }
 422
 423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 424 {
 425         acpi_status status = AE_OK;
 426
 427         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 428
 429         if (!tz)
 430                 return_VALUE(-EINVAL);
 431
 432         status =
 433             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 434         if (ACPI_FAILURE(status))
 435                 return_VALUE(-ENODEV);
 436
 437         return_VALUE(0);
 438 }
 439
 440 static int acpi_thermal_call_usermode(char *path)
 441 {
 442         char *argv[2] = { NULL, NULL };
 443         char *envp[3] = { NULL, NULL, NULL };
 444
 445         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 446
 447         if (!path)
 448                 return_VALUE(-EINVAL);
 449
 450         argv[0] = path;
 451
 452         /* minimal command environment */
 453         envp[0] = "HOME=/";
 454         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 455
 456         call_usermodehelper(argv[0], argv, envp, 0);
 457
 458         return_VALUE(0);
 459 }
 460
 461 static int acpi_thermal_critical(struct acpi_thermal *tz)
 462 {
 463         int result = 0;
 464         struct acpi_device *device = NULL;
 465
 466         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 467
 468         if (!tz || !tz->trips.critical.flags.valid)
 469                 return_VALUE(-EINVAL);
 470
 471         if (tz->temperature >= tz->trips.critical.temperature) {
 472                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 473                 tz->trips.critical.flags.enabled = 1;
 474         } else if (tz->trips.critical.flags.enabled)
 475                 tz->trips.critical.flags.enabled = 0;
 476
 477         result = acpi_bus_get_device(tz->handle, &device);
 478         if (result)
 479                 return_VALUE(result);
 480
 481         printk(KERN_EMERG
 482                "Critical temperature reached (%ld C), shutting down.\n",
 483                KELVIN_TO_CELSIUS(tz->temperature));
 484         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
 485                                 tz->trips.critical.flags.enabled);
 486
 487         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 488
 489         return_VALUE(0);
 490 }
 491
 492 static int acpi_thermal_hot(struct acpi_thermal *tz)
 493 {
 494         int result = 0;
 495         struct acpi_device *device = NULL;
 496
 497         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 498
 499         if (!tz || !tz->trips.hot.flags.valid)
 500                 return_VALUE(-EINVAL);
 501
 502         if (tz->temperature >= tz->trips.hot.temperature) {
 503                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 504                 tz->trips.hot.flags.enabled = 1;
 505         } else if (tz->trips.hot.flags.enabled)
 506                 tz->trips.hot.flags.enabled = 0;
 507
 508         result = acpi_bus_get_device(tz->handle, &device);
 509         if (result)
 510                 return_VALUE(result);
 511
 512         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
 513                                 tz->trips.hot.flags.enabled);
 514
 515         /* TBD: Call user-mode "sleep(S4)" function */
 516
 517         return_VALUE(0);
 518 }
 519
 520 static void acpi_thermal_passive(struct acpi_thermal *tz)
 521 {
 522         int result = 1;
 523         struct acpi_thermal_passive *passive = NULL;
 524         int trend = 0;
 525         int i = 0;
 526
 527         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 528
 529         if (!tz || !tz->trips.passive.flags.valid)
 530                 return;
 531
 532         passive = &(tz->trips.passive);
 533
 534         /*
 535          * Above Trip?
 536          * -----------
 537          * Calculate the thermal trend (using the passive cooling equation)
 538          * and modify the performance limit for all passive cooling devices
 539          * accordingly.  Note that we assume symmetry.
 540          */
 541         if (tz->temperature >= passive->temperature) {
 542                 trend =
 543                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 544                     (passive->tc2 * (tz->temperature - passive->temperature));
 545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 546                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 547                                   trend, passive->tc1, tz->temperature,
 548                                   tz->last_temperature, passive->tc2,
 549                                   tz->temperature, passive->temperature));
 550                 passive->flags.enabled = 1;
 551                 /* Heating up? */
 552                 if (trend > 0)
 553                         for (i = 0; i < passive->devices.count; i++)
 554                                 acpi_processor_set_thermal_limit(passive->
 555                                                                  devices.
 556                                                                  handles[i],
 557                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 558                 /* Cooling off? */
 559                 else if (trend < 0) {
 560                         for (i = 0; i < passive->devices.count; i++)
 561                                 /*
 562                                  * assume that we are on highest
 563                                  * freq/lowest thrott and can leave
 564                                  * passive mode, even in error case
 565                                  */
 566                                 if (!acpi_processor_set_thermal_limit
 567                                     (passive->devices.handles[i],
 568                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 569                                         result = 0;
 570                         /*
 571                          * Leave cooling mode, even if the temp might
 572                          * higher than trip point This is because some
 573                          * machines might have long thermal polling
 574                          * frequencies (tsp) defined. We will fall back
 575                          * into passive mode in next cycle (probably quicker)
 576                          */
 577                         if (result) {
 578                                 passive->flags.enabled = 0;
 579                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 580                                                   "Disabling passive cooling, still above threshold,"
 581                                                   " but we are cooling down\n"));
 582                         }
 583                 }
 584                 return;
 585         }
 586
 587         /*
 588          * Below Trip?
 589          * -----------
 590          * Implement passive cooling hysteresis to slowly increase performance
 591          * and avoid thrashing around the passive trip point.  Note that we
 592          * assume symmetry.
 593          */
 594         if (!passive->flags.enabled)
 595                 return;
 596         for (i = 0; i < passive->devices.count; i++)
 597                 if (!acpi_processor_set_thermal_limit
 598                     (passive->devices.handles[i],
 599                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 600                         result = 0;
 601         if (result) {
 602                 passive->flags.enabled = 0;
 603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                                   "Disabling passive cooling (zone is cool)\n"));
 605         }
 606 }
 607
 608 static void acpi_thermal_active(struct acpi_thermal *tz)
 609 {
 610         int result = 0;
 611         struct acpi_thermal_active *active = NULL;
 612         int i = 0;
 613         int j = 0;
 614         unsigned long maxtemp = 0;
 615
 616         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 617
 618         if (!tz)
 619                 return;
 620
 621         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 622                 active = &(tz->trips.active[i]);
 623                 if (!active || !active->flags.valid)
 624                         break;
 625                 if (tz->temperature >= active->temperature) {
 626                         /*
 627                          * Above Threshold?
 628                          * ----------------
 629                          * If not already enabled, turn ON all cooling devices
 630                          * associated with this active threshold.
 631                          */
 632                         if (active->temperature > maxtemp)
 633                                 tz->state.active_index = i;
 634                         maxtemp = active->temperature;
 635                         if (active->flags.enabled)
 636                                 continue;
 637                         for (j = 0; j < active->devices.count; j++) {
 638                                 result =
 639                                     acpi_bus_set_power(active->devices.
 640                                                        handles[j],
 641                                                        ACPI_STATE_D0);
 642                                 if (result) {
 643                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 644                                                           "Unable to turn cooling device [%p] 'on'\n",
 645                                                           active->devices.
 646                                                           handles[j]));
 647                                         continue;
 648                                 }
 649                                 active->flags.enabled = 1;
 650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 651                                                   "Cooling device [%p] now 'on'\n",
 652                                                   active->devices.handles[j]));
 653                         }
 654                         continue;
 655                 }
 656                 if (!active->flags.enabled)
 657                         continue;
 658                 /*
 659                  * Below Threshold?
 660                  * ----------------
 661                  * Turn OFF all cooling devices associated with this
 662                  * threshold.
 663                  */
 664                 for (j = 0; j < active->devices.count; j++) {
 665                         result = acpi_bus_set_power(active->devices.handles[j],
 666                                                     ACPI_STATE_D3);
 667                         if (result) {
 668                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 669                                                   "Unable to turn cooling device [%p] 'off'\n",
 670                                                   active->devices.handles[j]));
 671                                 continue;
 672                         }
 673                         active->flags.enabled = 0;
 674                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 675                                           "Cooling device [%p] now 'off'\n",
 676                                           active->devices.handles[j]));
 677                 }
 678         }
 679 }
 680
 681 static void acpi_thermal_check(void *context);
 682
 683 static void acpi_thermal_run(unsigned long data)
 684 {
 685         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 686         if (!tz->zombie)
 687                 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
 688                                             acpi_thermal_check, (void *)data);
 689 }
 690
 691 static void acpi_thermal_check(void *data)
 692 {
 693         int result = 0;
 694         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 695         unsigned long sleep_time = 0;
 696         int i = 0;
 697         struct acpi_thermal_state state;
 698
 699         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 700
 701         if (!tz) {
 702                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 703                 return_VOID;
 704         }
 705
 706         state = tz->state;
 707
 708         result = acpi_thermal_get_temperature(tz);
 709         if (result)
 710                 return_VOID;
 711
 712         memset(&tz->state, 0, sizeof(tz->state));
 713
 714         /*
 715          * Check Trip Points
 716          * -----------------
 717          * Compare the current temperature to the trip point values to see
 718          * if we've entered one of the thermal policy states.  Note that
 719          * this function determines when a state is entered, but the
 720          * individual policy decides when it is exited (e.g. hysteresis).
 721          */
 722         if (tz->trips.critical.flags.valid)
 723                 state.critical |=
 724                     (tz->temperature >= tz->trips.critical.temperature);
 725         if (tz->trips.hot.flags.valid)
 726                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 727         if (tz->trips.passive.flags.valid)
 728                 state.passive |=
 729                     (tz->temperature >= tz->trips.passive.temperature);
 730         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 731                 if (tz->trips.active[i].flags.valid)
 732                         state.active |=
 733                             (tz->temperature >=
 734                              tz->trips.active[i].temperature);
 735
 736         /*
 737          * Invoke Policy
 738          * -------------
 739          * Separated from the above check to allow individual policy to
 740          * determine when to exit a given state.
 741          */
 742         if (state.critical)
 743                 acpi_thermal_critical(tz);
 744         if (state.hot)
 745                 acpi_thermal_hot(tz);
 746         if (state.passive)
 747                 acpi_thermal_passive(tz);
 748         if (state.active)
 749                 acpi_thermal_active(tz);
 750
 751         /*
 752          * Calculate State
 753          * ---------------
 754          * Again, separated from the above two to allow independent policy
 755          * decisions.
 756          */
 757         tz->state.critical = tz->trips.critical.flags.enabled;
 758         tz->state.hot = tz->trips.hot.flags.enabled;
 759         tz->state.passive = tz->trips.passive.flags.enabled;
 760         tz->state.active = 0;
 761         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 762                 tz->state.active |= tz->trips.active[i].flags.enabled;
 763
 764         /*
 765          * Calculate Sleep Time
 766          * --------------------
 767          * If we're in the passive state, use _TSP's value.  Otherwise
 768          * use the default polling frequency (e.g. _TZP).  If no polling
 769          * frequency is specified then we'll wait forever (at least until
 770          * a thermal event occurs).  Note that _TSP and _TZD values are
 771          * given in 1/10th seconds (we must covert to milliseconds).
 772          */
 773         if (tz->state.passive)
 774                 sleep_time = tz->trips.passive.tsp * 100;
 775         else if (tz->polling_frequency > 0)
 776                 sleep_time = tz->polling_frequency * 100;
 777
 778         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 779                           tz->name, tz->temperature, sleep_time));
 780
 781         /*
 782          * Schedule Next Poll
 783          * ------------------
 784          */
 785         if (!sleep_time) {
 786                 if (timer_pending(&(tz->timer)))
 787                         del_timer(&(tz->timer));
 788         } else {
 789                 if (timer_pending(&(tz->timer)))
 790                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 791                 else {
 792                         tz->timer.data = (unsigned long)tz;
 793                         tz->timer.function = acpi_thermal_run;
 794                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 795                         add_timer(&(tz->timer));
 796                 }
 797         }
 798
 799         return_VOID;
 800 }
 801
 802 /* --------------------------------------------------------------------------
 803                               FS Interface (/proc)
 804    -------------------------------------------------------------------------- */
 805
 806 static struct proc_dir_entry *acpi_thermal_dir;
 807
 808 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 809 {
 810         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 811
 812         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 813
 814         if (!tz)
 815                 goto end;
 816
 817         seq_puts(seq, "state:                   ");
 818
 819         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 820             && !tz->state.active)
 821                 seq_puts(seq, "ok\n");
 822         else {
 823                 if (tz->state.critical)
 824                         seq_puts(seq, "critical ");
 825                 if (tz->state.hot)
 826                         seq_puts(seq, "hot ");
 827                 if (tz->state.passive)
 828                         seq_puts(seq, "passive ");
 829                 if (tz->state.active)
 830                         seq_printf(seq, "active[%d]", tz->state.active_index);
 831                 seq_puts(seq, "\n");
 832         }
 833
 834       end:
 835         return_VALUE(0);
 836 }
 837
 838 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 839 {
 840         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 841 }
 842
 843 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 844 {
 845         int result = 0;
 846         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 847
 848         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 849
 850         if (!tz)
 851                 goto end;
 852
 853         result = acpi_thermal_get_temperature(tz);
 854         if (result)
 855                 goto end;
 856
 857         seq_printf(seq, "temperature:             %ld C\n",
 858                    KELVIN_TO_CELSIUS(tz->temperature));
 859
 860       end:
 861         return_VALUE(0);
 862 }
 863
 864 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 865 {
 866         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 867 }
 868
 869 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 870 {
 871         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 872         int i = 0;
 873         int j = 0;
 874
 875         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 876
 877         if (!tz)
 878                 goto end;
 879
 880         if (tz->trips.critical.flags.valid)
 881                 seq_printf(seq, "critical (S5):           %ld C\n",
 882                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 883
 884         if (tz->trips.hot.flags.valid)
 885                 seq_printf(seq, "hot (S4):                %ld C\n",
 886                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 887
 888         if (tz->trips.passive.flags.valid) {
 889                 seq_printf(seq,
 890                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 891                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 892                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 893                            tz->trips.passive.tsp);
 894                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 895
 896                         seq_printf(seq, "0x%p ",
 897                                    tz->trips.passive.devices.handles[j]);
 898                 }
 899                 seq_puts(seq, "\n");
 900         }
 901
 902         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 903                 if (!(tz->trips.active[i].flags.valid))
 904                         break;
 905                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 906                            i,
 907                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 908                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 909                         seq_printf(seq, "0x%p ",
 910                                    tz->trips.active[i].devices.handles[j]);
 911                 seq_puts(seq, "\n");
 912         }
 913
 914       end:
 915         return_VALUE(0);
 916 }
 917
 918 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 919 {
 920         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 921 }
 922
 923 static ssize_t
 924 acpi_thermal_write_trip_points(struct file *file,
 925                                const char __user * buffer,
 926                                size_t count, loff_t * ppos)
 927 {
 928         struct seq_file *m = (struct seq_file *)file->private_data;
 929         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
 930
 931         char *limit_string;
 932         int num, critical, hot, passive;
 933         int *active;
 934         int i = 0;
 935
 936         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 937
 938         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 939         if (!limit_string)
 940                 return_VALUE(-ENOMEM);
 941
 942         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 943
 944         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 945         if (!active)
 946                 return_VALUE(-ENOMEM);
 947
 948         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 949                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 950                 count = -EINVAL;
 951                 goto end;
 952         }
 953
 954         if (copy_from_user(limit_string, buffer, count)) {
 955                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 956                 count = -EFAULT;
 957                 goto end;
 958         }
 959
 960         limit_string[count] = '\0';
 961
 962         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 963                      &critical, &hot, &passive,
 964                      &active[0], &active[1], &active[2], &active[3], &active[4],
 965                      &active[5], &active[6], &active[7], &active[8],
 966                      &active[9]);
 967         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 968                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 969                 count = -EINVAL;
 970                 goto end;
 971         }
 972
 973         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 974         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 975         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 976         for (i = 0; i < num - 3; i++) {
 977                 if (!(tz->trips.active[i].flags.valid))
 978                         break;
 979                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 980         }
 981
 982       end:
 983         kfree(active);
 984         kfree(limit_string);
 985         return_VALUE(count);
 986 }
 987
 988 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 989 {
 990         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 991
 992         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 993
 994         if (!tz)
 995                 goto end;
 996
 997         if (!tz->flags.cooling_mode) {
 998                 seq_puts(seq, "<setting not supported>\n");
 999         }
1000
1001         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1002                 seq_printf(seq, "cooling mode:  critical\n");
1003         else
1004                 seq_printf(seq, "cooling mode:  %s\n",
1005                            tz->cooling_mode ? "passive" : "active");
1006
1007       end:
1008         return_VALUE(0);
1009 }
1010
1011 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1012 {
1013         return single_open(file, acpi_thermal_cooling_seq_show,
1014                            PDE(inode)->data);
1015 }
1016
1017 static ssize_t
1018 acpi_thermal_write_cooling_mode(struct file *file,
1019                                 const char __user * buffer,
1020                                 size_t count, loff_t * ppos)
1021 {
1022         struct seq_file *m = (struct seq_file *)file->private_data;
1023         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1024         int result = 0;
1025         char mode_string[12] = { '\0' };
1026
1027         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1028
1029         if (!tz || (count > sizeof(mode_string) - 1))
1030                 return_VALUE(-EINVAL);
1031
1032         if (!tz->flags.cooling_mode)
1033                 return_VALUE(-ENODEV);
1034
1035         if (copy_from_user(mode_string, buffer, count))
1036                 return_VALUE(-EFAULT);
1037
1038         mode_string[count] = '\0';
1039
1040         result = acpi_thermal_set_cooling_mode(tz,
1041                                                simple_strtoul(mode_string, NULL,
1042                                                               0));
1043         if (result)
1044                 return_VALUE(result);
1045
1046         acpi_thermal_check(tz);
1047
1048         return_VALUE(count);
1049 }
1050
1051 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1052 {
1053         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1054
1055         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1056
1057         if (!tz)
1058                 goto end;
1059
1060         if (!tz->polling_frequency) {
1061                 seq_puts(seq, "<polling disabled>\n");
1062                 goto end;
1063         }
1064
1065         seq_printf(seq, "polling frequency:       %lu seconds\n",
1066                    (tz->polling_frequency / 10));
1067
1068       end:
1069         return_VALUE(0);
1070 }
1071
1072 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1073 {
1074         return single_open(file, acpi_thermal_polling_seq_show,
1075                            PDE(inode)->data);
1076 }
1077
1078 static ssize_t
1079 acpi_thermal_write_polling(struct file *file,
1080                            const char __user * buffer,
1081                            size_t count, loff_t * ppos)
1082 {
1083         struct seq_file *m = (struct seq_file *)file->private_data;
1084         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1085         int result = 0;
1086         char polling_string[12] = { '\0' };
1087         int seconds = 0;
1088
1089         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1090
1091         if (!tz || (count > sizeof(polling_string) - 1))
1092                 return_VALUE(-EINVAL);
1093
1094         if (copy_from_user(polling_string, buffer, count))
1095                 return_VALUE(-EFAULT);
1096
1097         polling_string[count] = '\0';
1098
1099         seconds = simple_strtoul(polling_string, NULL, 0);
1100
1101         result = acpi_thermal_set_polling(tz, seconds);
1102         if (result)
1103                 return_VALUE(result);
1104
1105         acpi_thermal_check(tz);
1106
1107         return_VALUE(count);
1108 }
1109
1110 static int acpi_thermal_add_fs(struct acpi_device *device)
1111 {
1112         struct proc_dir_entry *entry = NULL;
1113
1114         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1115
1116         if (!acpi_device_dir(device)) {
1117                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1118                                                      acpi_thermal_dir);
1119                 if (!acpi_device_dir(device))
1120                         return_VALUE(-ENODEV);
1121                 acpi_device_dir(device)->owner = THIS_MODULE;
1122         }
1123
1124         /* 'state' [R] */
1125         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1126                                   S_IRUGO, acpi_device_dir(device));
1127         if (!entry)
1128                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1129                                   "Unable to create '%s' fs entry\n",
1130                                   ACPI_THERMAL_FILE_STATE));
1131         else {
1132                 entry->proc_fops = &acpi_thermal_state_fops;
1133                 entry->data = acpi_driver_data(device);
1134                 entry->owner = THIS_MODULE;
1135         }
1136
1137         /* 'temperature' [R] */
1138         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1139                                   S_IRUGO, acpi_device_dir(device));
1140         if (!entry)
1141                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1142                                   "Unable to create '%s' fs entry\n",
1143                                   ACPI_THERMAL_FILE_TEMPERATURE));
1144         else {
1145                 entry->proc_fops = &acpi_thermal_temp_fops;
1146                 entry->data = acpi_driver_data(device);
1147                 entry->owner = THIS_MODULE;
1148         }
1149
1150         /* 'trip_points' [R/W] */
1151         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152                                   S_IFREG | S_IRUGO | S_IWUSR,
1153                                   acpi_device_dir(device));
1154         if (!entry)
1155                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1156                                   "Unable to create '%s' fs entry\n",
1157                                   ACPI_THERMAL_FILE_TRIP_POINTS));
1158         else {
1159                 entry->proc_fops = &acpi_thermal_trip_fops;
1160                 entry->data = acpi_driver_data(device);
1161                 entry->owner = THIS_MODULE;
1162         }
1163
1164         /* 'cooling_mode' [R/W] */
1165         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1166                                   S_IFREG | S_IRUGO | S_IWUSR,
1167                                   acpi_device_dir(device));
1168         if (!entry)
1169                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1170                                   "Unable to create '%s' fs entry\n",
1171                                   ACPI_THERMAL_FILE_COOLING_MODE));
1172         else {
1173                 entry->proc_fops = &acpi_thermal_cooling_fops;
1174                 entry->data = acpi_driver_data(device);
1175                 entry->owner = THIS_MODULE;
1176         }
1177
1178         /* 'polling_frequency' [R/W] */
1179         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1180                                   S_IFREG | S_IRUGO | S_IWUSR,
1181                                   acpi_device_dir(device));
1182         if (!entry)
1183                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1184                                   "Unable to create '%s' fs entry\n",
1185                                   ACPI_THERMAL_FILE_POLLING_FREQ));
1186         else {
1187                 entry->proc_fops = &acpi_thermal_polling_fops;
1188                 entry->data = acpi_driver_data(device);
1189                 entry->owner = THIS_MODULE;
1190         }
1191
1192         return_VALUE(0);
1193 }
1194
1195 static int acpi_thermal_remove_fs(struct acpi_device *device)
1196 {
1197         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1198
1199         if (acpi_device_dir(device)) {
1200                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1201                                   acpi_device_dir(device));
1202                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1203                                   acpi_device_dir(device));
1204                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1205                                   acpi_device_dir(device));
1206                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1207                                   acpi_device_dir(device));
1208                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1209                                   acpi_device_dir(device));
1210                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1211                 acpi_device_dir(device) = NULL;
1212         }
1213
1214         return_VALUE(0);
1215 }
1216
1217 /* --------------------------------------------------------------------------
1218                                  Driver Interface
1219    -------------------------------------------------------------------------- */
1220
1221 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1222 {
1223         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1224         struct acpi_device *device = NULL;
1225
1226         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1227
1228         if (!tz)
1229                 return_VOID;
1230
1231         if (acpi_bus_get_device(tz->handle, &device))
1232                 return_VOID;
1233
1234         switch (event) {
1235         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1236                 acpi_thermal_check(tz);
1237                 break;
1238         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1239                 acpi_thermal_get_trip_points(tz);
1240                 acpi_thermal_check(tz);
1241                 acpi_bus_generate_event(device, event, 0);
1242                 break;
1243         case ACPI_THERMAL_NOTIFY_DEVICES:
1244                 if (tz->flags.devices)
1245                         acpi_thermal_get_devices(tz);
1246                 acpi_bus_generate_event(device, event, 0);
1247                 break;
1248         default:
1249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1250                                   "Unsupported event [0x%x]\n", event));
1251                 break;
1252         }
1253
1254         return_VOID;
1255 }
1256
1257 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1258 {
1259         int result = 0;
1260
1261         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1262
1263         if (!tz)
1264                 return_VALUE(-EINVAL);
1265
1266         /* Get temperature [_TMP] (required) */
1267         result = acpi_thermal_get_temperature(tz);
1268         if (result)
1269                 return_VALUE(result);
1270
1271         /* Get trip points [_CRT, _PSV, etc.] (required) */
1272         result = acpi_thermal_get_trip_points(tz);
1273         if (result)
1274                 return_VALUE(result);
1275
1276         /* Set the cooling mode [_SCP] to active cooling (default) */
1277         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1278         if (!result)
1279                 tz->flags.cooling_mode = 1;
1280         else {
1281                 /* Oh,we have not _SCP method.
1282                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1283                 tz->flags.cooling_mode = 0;
1284                 if (tz->trips.active[0].flags.valid
1285                     && tz->trips.passive.flags.valid) {
1286                         if (tz->trips.passive.temperature >
1287                             tz->trips.active[0].temperature)
1288                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1289                         else
1290                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1291                 } else if (!tz->trips.active[0].flags.valid
1292                            && tz->trips.passive.flags.valid) {
1293                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1294                 } else if (tz->trips.active[0].flags.valid
1295                            && !tz->trips.passive.flags.valid) {
1296                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1297                 } else {
1298                         /* _ACx and _PSV are optional, but _CRT is required */
1299                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1300                 }
1301         }
1302
1303         /* Get default polling frequency [_TZP] (optional) */
1304         if (tzp)
1305                 tz->polling_frequency = tzp;
1306         else
1307                 acpi_thermal_get_polling_frequency(tz);
1308
1309         /* Get devices in this thermal zone [_TZD] (optional) */
1310         result = acpi_thermal_get_devices(tz);
1311         if (!result)
1312                 tz->flags.devices = 1;
1313
1314         return_VALUE(0);
1315 }
1316
1317 static int acpi_thermal_add(struct acpi_device *device)
1318 {
1319         int result = 0;
1320         acpi_status status = AE_OK;
1321         struct acpi_thermal *tz = NULL;
1322
1323         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1324
1325         if (!device)
1326                 return_VALUE(-EINVAL);
1327
1328         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1329         if (!tz)
1330                 return_VALUE(-ENOMEM);
1331         memset(tz, 0, sizeof(struct acpi_thermal));
1332
1333         tz->handle = device->handle;
1334         strcpy(tz->name, device->pnp.bus_id);
1335         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1336         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1337         acpi_driver_data(device) = tz;
1338
1339         result = acpi_thermal_get_info(tz);
1340         if (result)
1341                 goto end;
1342
1343         result = acpi_thermal_add_fs(device);
1344         if (result)
1345                 return_VALUE(result);
1346
1347         init_timer(&tz->timer);
1348
1349         acpi_thermal_check(tz);
1350
1351         status = acpi_install_notify_handler(tz->handle,
1352                                              ACPI_DEVICE_NOTIFY,
1353                                              acpi_thermal_notify, tz);
1354         if (ACPI_FAILURE(status)) {
1355                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1356                                   "Error installing notify handler\n"));
1357                 result = -ENODEV;
1358                 goto end;
1359         }
1360
1361         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1362                acpi_device_name(device), acpi_device_bid(device),
1363                KELVIN_TO_CELSIUS(tz->temperature));
1364
1365       end:
1366         if (result) {
1367                 acpi_thermal_remove_fs(device);
1368                 kfree(tz);
1369         }
1370
1371         return_VALUE(result);
1372 }
1373
1374 static int acpi_thermal_remove(struct acpi_device *device, int type)
1375 {
1376         acpi_status status = AE_OK;
1377         struct acpi_thermal *tz = NULL;
1378
1379         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1380
1381         if (!device || !acpi_driver_data(device))
1382                 return_VALUE(-EINVAL);
1383
1384         tz = (struct acpi_thermal *)acpi_driver_data(device);
1385
1386         /* avoid timer adding new defer task */
1387         tz->zombie = 1;
1388         /* wait for running timer (on other CPUs) finish */
1389         del_timer_sync(&(tz->timer));
1390         /* synchronize deferred task */
1391         acpi_os_wait_events_complete(NULL);
1392         /* deferred task may reinsert timer */
1393         del_timer_sync(&(tz->timer));
1394
1395         status = acpi_remove_notify_handler(tz->handle,
1396                                             ACPI_DEVICE_NOTIFY,
1397                                             acpi_thermal_notify);
1398         if (ACPI_FAILURE(status))
1399                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1400                                   "Error removing notify handler\n"));
1401
1402         /* Terminate policy */
1403         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1404                 tz->trips.passive.flags.enabled = 0;
1405                 acpi_thermal_passive(tz);
1406         }
1407         if (tz->trips.active[0].flags.valid
1408             && tz->trips.active[0].flags.enabled) {
1409                 tz->trips.active[0].flags.enabled = 0;
1410                 acpi_thermal_active(tz);
1411         }
1412
1413         acpi_thermal_remove_fs(device);
1414
1415         kfree(tz);
1416         return_VALUE(0);
1417 }
1418
1419 static int __init acpi_thermal_init(void)
1420 {
1421         int result = 0;
1422
1423         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1424
1425         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1426         if (!acpi_thermal_dir)
1427                 return_VALUE(-ENODEV);
1428         acpi_thermal_dir->owner = THIS_MODULE;
1429
1430         result = acpi_bus_register_driver(&acpi_thermal_driver);
1431         if (result < 0) {
1432                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1433                 return_VALUE(-ENODEV);
1434         }
1435
1436         return_VALUE(0);
1437 }
1438
1439 static void __exit acpi_thermal_exit(void)
1440 {
1441         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1442
1443         acpi_bus_unregister_driver(&acpi_thermal_driver);
1444
1445         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1446
1447         return_VOID;
1448 }
1449
1450 module_init(acpi_thermal_init);
1451 module_exit(acpi_thermal_exit);