drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/timer.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <acpi/acpi_bus.h>
  47 #include <acpi/acpi_drivers.h>
  48
  49 #define ACPI_THERMAL_COMPONENT          0x04000000
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  68 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  69
  70 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  71 ACPI_MODULE_NAME("thermal");
  72
  73 MODULE_AUTHOR("Paul Diefenbaugh");
  74 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  75 MODULE_LICENSE("GPL");
  76
  77 static int tzp;
  78 module_param(tzp, int, 0);
  79 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  80
  81 static int acpi_thermal_add(struct acpi_device *device);
  82 static int acpi_thermal_remove(struct acpi_device *device, int type);
  83 static int acpi_thermal_resume(struct acpi_device *device);
  84 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  85 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  89                                                const char __user *, size_t,
  90                                                loff_t *);
  91 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  92 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  93                                           size_t, loff_t *);
  94
  95 static const struct acpi_device_id  thermal_device_ids[] = {
  96         {ACPI_THERMAL_HID, 0},
  97         {"", 0},
  98 };
  99 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 100
 101 static struct acpi_driver acpi_thermal_driver = {
 102         .name = "thermal",
 103         .class = ACPI_THERMAL_CLASS,
 104         .ids = thermal_device_ids,
 105         .ops = {
 106                 .add = acpi_thermal_add,
 107                 .remove = acpi_thermal_remove,
 108                 .resume = acpi_thermal_resume,
 109                 },
 110 };
 111
 112 struct acpi_thermal_state {
 113         u8 critical:1;
 114         u8 hot:1;
 115         u8 passive:1;
 116         u8 active:1;
 117         u8 reserved:4;
 118         int active_index;
 119 };
 120
 121 struct acpi_thermal_state_flags {
 122         u8 valid:1;
 123         u8 enabled:1;
 124         u8 reserved:6;
 125 };
 126
 127 struct acpi_thermal_critical {
 128         struct acpi_thermal_state_flags flags;
 129         unsigned long temperature;
 130 };
 131
 132 struct acpi_thermal_hot {
 133         struct acpi_thermal_state_flags flags;
 134         unsigned long temperature;
 135 };
 136
 137 struct acpi_thermal_passive {
 138         struct acpi_thermal_state_flags flags;
 139         unsigned long temperature;
 140         unsigned long tc1;
 141         unsigned long tc2;
 142         unsigned long tsp;
 143         struct acpi_handle_list devices;
 144 };
 145
 146 struct acpi_thermal_active {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149         struct acpi_handle_list devices;
 150 };
 151
 152 struct acpi_thermal_trips {
 153         struct acpi_thermal_critical critical;
 154         struct acpi_thermal_hot hot;
 155         struct acpi_thermal_passive passive;
 156         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 157 };
 158
 159 struct acpi_thermal_flags {
 160         u8 cooling_mode:1;      /* _SCP */
 161         u8 devices:1;           /* _TZD */
 162         u8 reserved:6;
 163 };
 164
 165 struct acpi_thermal {
 166         struct acpi_device * device;
 167         acpi_bus_id name;
 168         unsigned long temperature;
 169         unsigned long last_temperature;
 170         unsigned long polling_frequency;
 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         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static const struct file_operations acpi_thermal_cooling_fops = {
 201         .open = acpi_thermal_cooling_open_fs,
 202         .read = seq_read,
 203         .write = acpi_thermal_write_cooling_mode,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static const struct file_operations acpi_thermal_polling_fops = {
 209         .open = acpi_thermal_polling_open_fs,
 210         .read = seq_read,
 211         .write = acpi_thermal_write_polling,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 /* --------------------------------------------------------------------------
 217                              Thermal Zone Management
 218    -------------------------------------------------------------------------- */
 219
 220 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 221 {
 222         acpi_status status = AE_OK;
 223
 224
 225         if (!tz)
 226                 return -EINVAL;
 227
 228         tz->last_temperature = tz->temperature;
 229
 230         status =
 231             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 232         if (ACPI_FAILURE(status))
 233                 return -ENODEV;
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 236                           tz->temperature));
 237
 238         return 0;
 239 }
 240
 241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         status =
 250             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 251                                   &tz->polling_frequency);
 252         if (ACPI_FAILURE(status))
 253                 return -ENODEV;
 254
 255         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 256                           tz->polling_frequency));
 257
 258         return 0;
 259 }
 260
 261 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 262 {
 263
 264         if (!tz)
 265                 return -EINVAL;
 266
 267         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 268
 269         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 270                           "Polling frequency set to %lu seconds\n",
 271                           tz->polling_frequency/10));
 272
 273         return 0;
 274 }
 275
 276 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 277 {
 278         acpi_status status = AE_OK;
 279         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 280         struct acpi_object_list arg_list = { 1, &arg0 };
 281         acpi_handle handle = NULL;
 282
 283
 284         if (!tz)
 285                 return -EINVAL;
 286
 287         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 288         if (ACPI_FAILURE(status)) {
 289                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 290                 return -ENODEV;
 291         }
 292
 293         arg0.integer.value = mode;
 294
 295         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 296         if (ACPI_FAILURE(status))
 297                 return -ENODEV;
 298
 299         return 0;
 300 }
 301
 302 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 303 {
 304         acpi_status status = AE_OK;
 305         int i = 0;
 306
 307
 308         if (!tz)
 309                 return -EINVAL;
 310
 311         /* Critical Shutdown (required) */
 312
 313         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
 314                                        &tz->trips.critical.temperature);
 315         if (ACPI_FAILURE(status)) {
 316                 tz->trips.critical.flags.valid = 0;
 317                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
 318                 return -ENODEV;
 319         } else {
 320                 tz->trips.critical.flags.valid = 1;
 321                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 322                                   "Found critical threshold [%lu]\n",
 323                                   tz->trips.critical.temperature));
 324         }
 325
 326         /* Critical Sleep (optional) */
 327
 328         status =
 329             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
 330                                   &tz->trips.hot.temperature);
 331         if (ACPI_FAILURE(status)) {
 332                 tz->trips.hot.flags.valid = 0;
 333                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 334         } else {
 335                 tz->trips.hot.flags.valid = 1;
 336                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 337                                   tz->trips.hot.temperature));
 338         }
 339
 340         /* Passive: Processors (optional) */
 341
 342         status =
 343             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
 344                                   &tz->trips.passive.temperature);
 345         if (ACPI_FAILURE(status)) {
 346                 tz->trips.passive.flags.valid = 0;
 347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 348         } else {
 349                 tz->trips.passive.flags.valid = 1;
 350
 351                 status =
 352                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
 353                                           &tz->trips.passive.tc1);
 354                 if (ACPI_FAILURE(status))
 355                         tz->trips.passive.flags.valid = 0;
 356
 357                 status =
 358                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
 359                                           &tz->trips.passive.tc2);
 360                 if (ACPI_FAILURE(status))
 361                         tz->trips.passive.flags.valid = 0;
 362
 363                 status =
 364                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
 365                                           &tz->trips.passive.tsp);
 366                 if (ACPI_FAILURE(status))
 367                         tz->trips.passive.flags.valid = 0;
 368
 369                 status =
 370                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
 371                                             &tz->trips.passive.devices);
 372                 if (ACPI_FAILURE(status))
 373                         tz->trips.passive.flags.valid = 0;
 374
 375                 if (!tz->trips.passive.flags.valid)
 376                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
 377                 else
 378                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 379                                           "Found passive threshold [%lu]\n",
 380                                           tz->trips.passive.temperature));
 381         }
 382
 383         /* Active: Fans, etc. (optional) */
 384
 385         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 386
 387                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 388
 389                 status =
 390                     acpi_evaluate_integer(tz->device->handle, name, NULL,
 391                                           &tz->trips.active[i].temperature);
 392                 if (ACPI_FAILURE(status))
 393                         break;
 394
 395                 name[2] = 'L';
 396                 status =
 397                     acpi_evaluate_reference(tz->device->handle, name, NULL,
 398                                             &tz->trips.active[i].devices);
 399                 if (ACPI_SUCCESS(status)) {
 400                         tz->trips.active[i].flags.valid = 1;
 401                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 402                                           "Found active threshold [%d]:[%lu]\n",
 403                                           i, tz->trips.active[i].temperature));
 404                 } else
 405                         ACPI_EXCEPTION((AE_INFO, status,
 406                                         "Invalid active threshold [%d]", i));
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 413 {
 414         acpi_status status = AE_OK;
 415
 416
 417         if (!tz)
 418                 return -EINVAL;
 419
 420         status =
 421             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
 422         if (ACPI_FAILURE(status))
 423                 return -ENODEV;
 424
 425         return 0;
 426 }
 427
 428 static int acpi_thermal_critical(struct acpi_thermal *tz)
 429 {
 430         if (!tz || !tz->trips.critical.flags.valid)
 431                 return -EINVAL;
 432
 433         if (tz->temperature >= tz->trips.critical.temperature) {
 434                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 435                 tz->trips.critical.flags.enabled = 1;
 436         } else if (tz->trips.critical.flags.enabled)
 437                 tz->trips.critical.flags.enabled = 0;
 438
 439         printk(KERN_EMERG
 440                "Critical temperature reached (%ld C), shutting down.\n",
 441                KELVIN_TO_CELSIUS(tz->temperature));
 442         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 443                                 tz->trips.critical.flags.enabled);
 444
 445         orderly_poweroff(true);
 446
 447         return 0;
 448 }
 449
 450 static int acpi_thermal_hot(struct acpi_thermal *tz)
 451 {
 452         if (!tz || !tz->trips.hot.flags.valid)
 453                 return -EINVAL;
 454
 455         if (tz->temperature >= tz->trips.hot.temperature) {
 456                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 457                 tz->trips.hot.flags.enabled = 1;
 458         } else if (tz->trips.hot.flags.enabled)
 459                 tz->trips.hot.flags.enabled = 0;
 460
 461         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 462                                 tz->trips.hot.flags.enabled);
 463
 464         /* TBD: Call user-mode "sleep(S4)" function */
 465
 466         return 0;
 467 }
 468
 469 static void acpi_thermal_passive(struct acpi_thermal *tz)
 470 {
 471         int result = 1;
 472         struct acpi_thermal_passive *passive = NULL;
 473         int trend = 0;
 474         int i = 0;
 475
 476
 477         if (!tz || !tz->trips.passive.flags.valid)
 478                 return;
 479
 480         passive = &(tz->trips.passive);
 481
 482         /*
 483          * Above Trip?
 484          * -----------
 485          * Calculate the thermal trend (using the passive cooling equation)
 486          * and modify the performance limit for all passive cooling devices
 487          * accordingly.  Note that we assume symmetry.
 488          */
 489         if (tz->temperature >= passive->temperature) {
 490                 trend =
 491                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 492                     (passive->tc2 * (tz->temperature - passive->temperature));
 493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 494                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 495                                   trend, passive->tc1, tz->temperature,
 496                                   tz->last_temperature, passive->tc2,
 497                                   tz->temperature, passive->temperature));
 498                 passive->flags.enabled = 1;
 499                 /* Heating up? */
 500                 if (trend > 0)
 501                         for (i = 0; i < passive->devices.count; i++)
 502                                 acpi_processor_set_thermal_limit(passive->
 503                                                                  devices.
 504                                                                  handles[i],
 505                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 506                 /* Cooling off? */
 507                 else if (trend < 0) {
 508                         for (i = 0; i < passive->devices.count; i++)
 509                                 /*
 510                                  * assume that we are on highest
 511                                  * freq/lowest thrott and can leave
 512                                  * passive mode, even in error case
 513                                  */
 514                                 if (!acpi_processor_set_thermal_limit
 515                                     (passive->devices.handles[i],
 516                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 517                                         result = 0;
 518                         /*
 519                          * Leave cooling mode, even if the temp might
 520                          * higher than trip point This is because some
 521                          * machines might have long thermal polling
 522                          * frequencies (tsp) defined. We will fall back
 523                          * into passive mode in next cycle (probably quicker)
 524                          */
 525                         if (result) {
 526                                 passive->flags.enabled = 0;
 527                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 528                                                   "Disabling passive cooling, still above threshold,"
 529                                                   " but we are cooling down\n"));
 530                         }
 531                 }
 532                 return;
 533         }
 534
 535         /*
 536          * Below Trip?
 537          * -----------
 538          * Implement passive cooling hysteresis to slowly increase performance
 539          * and avoid thrashing around the passive trip point.  Note that we
 540          * assume symmetry.
 541          */
 542         if (!passive->flags.enabled)
 543                 return;
 544         for (i = 0; i < passive->devices.count; i++)
 545                 if (!acpi_processor_set_thermal_limit
 546                     (passive->devices.handles[i],
 547                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 548                         result = 0;
 549         if (result) {
 550                 passive->flags.enabled = 0;
 551                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 552                                   "Disabling passive cooling (zone is cool)\n"));
 553         }
 554 }
 555
 556 static void acpi_thermal_active(struct acpi_thermal *tz)
 557 {
 558         int result = 0;
 559         struct acpi_thermal_active *active = NULL;
 560         int i = 0;
 561         int j = 0;
 562         unsigned long maxtemp = 0;
 563
 564
 565         if (!tz)
 566                 return;
 567
 568         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 569                 active = &(tz->trips.active[i]);
 570                 if (!active || !active->flags.valid)
 571                         break;
 572                 if (tz->temperature >= active->temperature) {
 573                         /*
 574                          * Above Threshold?
 575                          * ----------------
 576                          * If not already enabled, turn ON all cooling devices
 577                          * associated with this active threshold.
 578                          */
 579                         if (active->temperature > maxtemp)
 580                                 tz->state.active_index = i;
 581                         maxtemp = active->temperature;
 582                         if (active->flags.enabled)
 583                                 continue;
 584                         for (j = 0; j < active->devices.count; j++) {
 585                                 result =
 586                                     acpi_bus_set_power(active->devices.
 587                                                        handles[j],
 588                                                        ACPI_STATE_D0);
 589                                 if (result) {
 590                                         printk(KERN_WARNING PREFIX
 591                                                       "Unable to turn cooling device [%p] 'on'\n",
 592                                                       active->devices.
 593                                                       handles[j]);
 594                                         continue;
 595                                 }
 596                                 active->flags.enabled = 1;
 597                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 598                                                   "Cooling device [%p] now 'on'\n",
 599                                                   active->devices.handles[j]));
 600                         }
 601                         continue;
 602                 }
 603                 if (!active->flags.enabled)
 604                         continue;
 605                 /*
 606                  * Below Threshold?
 607                  * ----------------
 608                  * Turn OFF all cooling devices associated with this
 609                  * threshold.
 610                  */
 611                 for (j = 0; j < active->devices.count; j++) {
 612                         result = acpi_bus_set_power(active->devices.handles[j],
 613                                                     ACPI_STATE_D3);
 614                         if (result) {
 615                                 printk(KERN_WARNING PREFIX
 616                                               "Unable to turn cooling device [%p] 'off'\n",
 617                                               active->devices.handles[j]);
 618                                 continue;
 619                         }
 620                         active->flags.enabled = 0;
 621                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 622                                           "Cooling device [%p] now 'off'\n",
 623                                           active->devices.handles[j]));
 624                 }
 625         }
 626 }
 627
 628 static void acpi_thermal_check(void *context);
 629
 630 static void acpi_thermal_run(unsigned long data)
 631 {
 632         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 633         if (!tz->zombie)
 634                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 635 }
 636
 637 static void acpi_thermal_check(void *data)
 638 {
 639         int result = 0;
 640         struct acpi_thermal *tz = data;
 641         unsigned long sleep_time = 0;
 642         int i = 0;
 643         struct acpi_thermal_state state;
 644
 645
 646         if (!tz) {
 647                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 648                 return;
 649         }
 650
 651         state = tz->state;
 652
 653         result = acpi_thermal_get_temperature(tz);
 654         if (result)
 655                 return;
 656
 657         memset(&tz->state, 0, sizeof(tz->state));
 658
 659         /*
 660          * Check Trip Points
 661          * -----------------
 662          * Compare the current temperature to the trip point values to see
 663          * if we've entered one of the thermal policy states.  Note that
 664          * this function determines when a state is entered, but the
 665          * individual policy decides when it is exited (e.g. hysteresis).
 666          */
 667         if (tz->trips.critical.flags.valid)
 668                 state.critical |=
 669                     (tz->temperature >= tz->trips.critical.temperature);
 670         if (tz->trips.hot.flags.valid)
 671                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 672         if (tz->trips.passive.flags.valid)
 673                 state.passive |=
 674                     (tz->temperature >= tz->trips.passive.temperature);
 675         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 676                 if (tz->trips.active[i].flags.valid)
 677                         state.active |=
 678                             (tz->temperature >=
 679                              tz->trips.active[i].temperature);
 680
 681         /*
 682          * Invoke Policy
 683          * -------------
 684          * Separated from the above check to allow individual policy to
 685          * determine when to exit a given state.
 686          */
 687         if (state.critical)
 688                 acpi_thermal_critical(tz);
 689         if (state.hot)
 690                 acpi_thermal_hot(tz);
 691         if (state.passive)
 692                 acpi_thermal_passive(tz);
 693         if (state.active)
 694                 acpi_thermal_active(tz);
 695
 696         /*
 697          * Calculate State
 698          * ---------------
 699          * Again, separated from the above two to allow independent policy
 700          * decisions.
 701          */
 702         tz->state.critical = tz->trips.critical.flags.enabled;
 703         tz->state.hot = tz->trips.hot.flags.enabled;
 704         tz->state.passive = tz->trips.passive.flags.enabled;
 705         tz->state.active = 0;
 706         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 707                 tz->state.active |= tz->trips.active[i].flags.enabled;
 708
 709         /*
 710          * Calculate Sleep Time
 711          * --------------------
 712          * If we're in the passive state, use _TSP's value.  Otherwise
 713          * use the default polling frequency (e.g. _TZP).  If no polling
 714          * frequency is specified then we'll wait forever (at least until
 715          * a thermal event occurs).  Note that _TSP and _TZD values are
 716          * given in 1/10th seconds (we must covert to milliseconds).
 717          */
 718         if (tz->state.passive)
 719                 sleep_time = tz->trips.passive.tsp * 100;
 720         else if (tz->polling_frequency > 0)
 721                 sleep_time = tz->polling_frequency * 100;
 722
 723         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 724                           tz->name, tz->temperature, sleep_time));
 725
 726         /*
 727          * Schedule Next Poll
 728          * ------------------
 729          */
 730         if (!sleep_time) {
 731                 if (timer_pending(&(tz->timer)))
 732                         del_timer(&(tz->timer));
 733         } else {
 734                 if (timer_pending(&(tz->timer)))
 735                         mod_timer(&(tz->timer),
 736                                         jiffies + (HZ * sleep_time) / 1000);
 737                 else {
 738                         tz->timer.data = (unsigned long)tz;
 739                         tz->timer.function = acpi_thermal_run;
 740                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 741                         add_timer(&(tz->timer));
 742                 }
 743         }
 744
 745         return;
 746 }
 747
 748 /* --------------------------------------------------------------------------
 749                               FS Interface (/proc)
 750    -------------------------------------------------------------------------- */
 751
 752 static struct proc_dir_entry *acpi_thermal_dir;
 753
 754 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 755 {
 756         struct acpi_thermal *tz = seq->private;
 757
 758
 759         if (!tz)
 760                 goto end;
 761
 762         seq_puts(seq, "state:                   ");
 763
 764         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 765             && !tz->state.active)
 766                 seq_puts(seq, "ok\n");
 767         else {
 768                 if (tz->state.critical)
 769                         seq_puts(seq, "critical ");
 770                 if (tz->state.hot)
 771                         seq_puts(seq, "hot ");
 772                 if (tz->state.passive)
 773                         seq_puts(seq, "passive ");
 774                 if (tz->state.active)
 775                         seq_printf(seq, "active[%d]", tz->state.active_index);
 776                 seq_puts(seq, "\n");
 777         }
 778
 779       end:
 780         return 0;
 781 }
 782
 783 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 784 {
 785         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 786 }
 787
 788 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 789 {
 790         int result = 0;
 791         struct acpi_thermal *tz = seq->private;
 792
 793
 794         if (!tz)
 795                 goto end;
 796
 797         result = acpi_thermal_get_temperature(tz);
 798         if (result)
 799                 goto end;
 800
 801         seq_printf(seq, "temperature:             %ld C\n",
 802                    KELVIN_TO_CELSIUS(tz->temperature));
 803
 804       end:
 805         return 0;
 806 }
 807
 808 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 809 {
 810         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 811 }
 812
 813 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 814 {
 815         struct acpi_thermal *tz = seq->private;
 816         struct acpi_device *device;
 817         acpi_status status;
 818
 819         int i = 0;
 820         int j = 0;
 821
 822
 823         if (!tz)
 824                 goto end;
 825
 826         if (tz->trips.critical.flags.valid)
 827                 seq_printf(seq, "critical (S5):           %ld C\n",
 828                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 829
 830         if (tz->trips.hot.flags.valid)
 831                 seq_printf(seq, "hot (S4):                %ld C\n",
 832                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 833
 834         if (tz->trips.passive.flags.valid) {
 835                 seq_printf(seq,
 836                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 837                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 838                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 839                            tz->trips.passive.tsp);
 840                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 841                         status = acpi_bus_get_device(tz->trips.passive.devices.
 842                                                      handles[j], &device);
 843                         seq_printf(seq, "%4.4s ", status ? "" :
 844                                    acpi_device_bid(device));
 845                 }
 846                 seq_puts(seq, "\n");
 847         }
 848
 849         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 850                 if (!(tz->trips.active[i].flags.valid))
 851                         break;
 852                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 853                            i,
 854                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 855                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
 856                         status = acpi_bus_get_device(tz->trips.active[i].
 857                                                      devices.handles[j],
 858                                                      &device);
 859                         seq_printf(seq, "%4.4s ", status ? "" :
 860                                    acpi_device_bid(device));
 861                 }
 862                 seq_puts(seq, "\n");
 863         }
 864
 865       end:
 866         return 0;
 867 }
 868
 869 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 870 {
 871         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 872 }
 873
 874 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 875 {
 876         struct acpi_thermal *tz = seq->private;
 877
 878
 879         if (!tz)
 880                 goto end;
 881
 882         if (!tz->flags.cooling_mode)
 883                 seq_puts(seq, "<setting not supported>\n");
 884         else
 885                 seq_puts(seq, "0 - Active; 1 - Passive\n");
 886
 887       end:
 888         return 0;
 889 }
 890
 891 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
 892 {
 893         return single_open(file, acpi_thermal_cooling_seq_show,
 894                            PDE(inode)->data);
 895 }
 896
 897 static ssize_t
 898 acpi_thermal_write_cooling_mode(struct file *file,
 899                                 const char __user * buffer,
 900                                 size_t count, loff_t * ppos)
 901 {
 902         struct seq_file *m = file->private_data;
 903         struct acpi_thermal *tz = m->private;
 904         int result = 0;
 905         char mode_string[12] = { '\0' };
 906
 907
 908         if (!tz || (count > sizeof(mode_string) - 1))
 909                 return -EINVAL;
 910
 911         if (!tz->flags.cooling_mode)
 912                 return -ENODEV;
 913
 914         if (copy_from_user(mode_string, buffer, count))
 915                 return -EFAULT;
 916
 917         mode_string[count] = '\0';
 918
 919         result = acpi_thermal_set_cooling_mode(tz,
 920                                                simple_strtoul(mode_string, NULL,
 921                                                               0));
 922         if (result)
 923                 return result;
 924
 925         acpi_thermal_check(tz);
 926
 927         return count;
 928 }
 929
 930 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
 931 {
 932         struct acpi_thermal *tz = seq->private;
 933
 934
 935         if (!tz)
 936                 goto end;
 937
 938         if (!tz->polling_frequency) {
 939                 seq_puts(seq, "<polling disabled>\n");
 940                 goto end;
 941         }
 942
 943         seq_printf(seq, "polling frequency:       %lu seconds\n",
 944                    (tz->polling_frequency / 10));
 945
 946       end:
 947         return 0;
 948 }
 949
 950 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
 951 {
 952         return single_open(file, acpi_thermal_polling_seq_show,
 953                            PDE(inode)->data);
 954 }
 955
 956 static ssize_t
 957 acpi_thermal_write_polling(struct file *file,
 958                            const char __user * buffer,
 959                            size_t count, loff_t * ppos)
 960 {
 961         struct seq_file *m = file->private_data;
 962         struct acpi_thermal *tz = m->private;
 963         int result = 0;
 964         char polling_string[12] = { '\0' };
 965         int seconds = 0;
 966
 967
 968         if (!tz || (count > sizeof(polling_string) - 1))
 969                 return -EINVAL;
 970
 971         if (copy_from_user(polling_string, buffer, count))
 972                 return -EFAULT;
 973
 974         polling_string[count] = '\0';
 975
 976         seconds = simple_strtoul(polling_string, NULL, 0);
 977
 978         result = acpi_thermal_set_polling(tz, seconds);
 979         if (result)
 980                 return result;
 981
 982         acpi_thermal_check(tz);
 983
 984         return count;
 985 }
 986
 987 static int acpi_thermal_add_fs(struct acpi_device *device)
 988 {
 989         struct proc_dir_entry *entry = NULL;
 990
 991
 992         if (!acpi_device_dir(device)) {
 993                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 994                                                      acpi_thermal_dir);
 995                 if (!acpi_device_dir(device))
 996                         return -ENODEV;
 997                 acpi_device_dir(device)->owner = THIS_MODULE;
 998         }
 999
1000         /* 'state' [R] */
1001         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1002                                   S_IRUGO, acpi_device_dir(device));
1003         if (!entry)
1004                 return -ENODEV;
1005         else {
1006                 entry->proc_fops = &acpi_thermal_state_fops;
1007                 entry->data = acpi_driver_data(device);
1008                 entry->owner = THIS_MODULE;
1009         }
1010
1011         /* 'temperature' [R] */
1012         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1013                                   S_IRUGO, acpi_device_dir(device));
1014         if (!entry)
1015                 return -ENODEV;
1016         else {
1017                 entry->proc_fops = &acpi_thermal_temp_fops;
1018                 entry->data = acpi_driver_data(device);
1019                 entry->owner = THIS_MODULE;
1020         }
1021
1022         /* 'trip_points' [R/W] */
1023         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1024                                   S_IFREG | S_IRUGO | S_IWUSR,
1025                                   acpi_device_dir(device));
1026         if (!entry)
1027                 return -ENODEV;
1028         else {
1029                 entry->proc_fops = &acpi_thermal_trip_fops;
1030                 entry->data = acpi_driver_data(device);
1031                 entry->owner = THIS_MODULE;
1032         }
1033
1034         /* 'cooling_mode' [R/W] */
1035         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1036                                   S_IFREG | S_IRUGO | S_IWUSR,
1037                                   acpi_device_dir(device));
1038         if (!entry)
1039                 return -ENODEV;
1040         else {
1041                 entry->proc_fops = &acpi_thermal_cooling_fops;
1042                 entry->data = acpi_driver_data(device);
1043                 entry->owner = THIS_MODULE;
1044         }
1045
1046         /* 'polling_frequency' [R/W] */
1047         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1048                                   S_IFREG | S_IRUGO | S_IWUSR,
1049                                   acpi_device_dir(device));
1050         if (!entry)
1051                 return -ENODEV;
1052         else {
1053                 entry->proc_fops = &acpi_thermal_polling_fops;
1054                 entry->data = acpi_driver_data(device);
1055                 entry->owner = THIS_MODULE;
1056         }
1057
1058         return 0;
1059 }
1060
1061 static int acpi_thermal_remove_fs(struct acpi_device *device)
1062 {
1063
1064         if (acpi_device_dir(device)) {
1065                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1066                                   acpi_device_dir(device));
1067                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1068                                   acpi_device_dir(device));
1069                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1070                                   acpi_device_dir(device));
1071                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1072                                   acpi_device_dir(device));
1073                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1074                                   acpi_device_dir(device));
1075                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1076                 acpi_device_dir(device) = NULL;
1077         }
1078
1079         return 0;
1080 }
1081
1082 /* --------------------------------------------------------------------------
1083                                  Driver Interface
1084    -------------------------------------------------------------------------- */
1085
1086 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1087 {
1088         struct acpi_thermal *tz = data;
1089         struct acpi_device *device = NULL;
1090
1091
1092         if (!tz)
1093                 return;
1094
1095         device = tz->device;
1096
1097         switch (event) {
1098         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1099                 acpi_thermal_check(tz);
1100                 break;
1101         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1102                 acpi_thermal_get_trip_points(tz);
1103                 acpi_thermal_check(tz);
1104                 acpi_bus_generate_event(device, event, 0);
1105                 break;
1106         case ACPI_THERMAL_NOTIFY_DEVICES:
1107                 if (tz->flags.devices)
1108                         acpi_thermal_get_devices(tz);
1109                 acpi_bus_generate_event(device, event, 0);
1110                 break;
1111         default:
1112                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1113                                   "Unsupported event [0x%x]\n", event));
1114                 break;
1115         }
1116
1117         return;
1118 }
1119
1120 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1121 {
1122         int result = 0;
1123
1124
1125         if (!tz)
1126                 return -EINVAL;
1127
1128         /* Get temperature [_TMP] (required) */
1129         result = acpi_thermal_get_temperature(tz);
1130         if (result)
1131                 return result;
1132
1133         /* Get trip points [_CRT, _PSV, etc.] (required) */
1134         result = acpi_thermal_get_trip_points(tz);
1135         if (result)
1136                 return result;
1137
1138         /* Set the cooling mode [_SCP] to active cooling (default) */
1139         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1140         if (!result)
1141                 tz->flags.cooling_mode = 1;
1142
1143         /* Get default polling frequency [_TZP] (optional) */
1144         if (tzp)
1145                 tz->polling_frequency = tzp;
1146         else
1147                 acpi_thermal_get_polling_frequency(tz);
1148
1149         /* Get devices in this thermal zone [_TZD] (optional) */
1150         result = acpi_thermal_get_devices(tz);
1151         if (!result)
1152                 tz->flags.devices = 1;
1153
1154         return 0;
1155 }
1156
1157 static int acpi_thermal_add(struct acpi_device *device)
1158 {
1159         int result = 0;
1160         acpi_status status = AE_OK;
1161         struct acpi_thermal *tz = NULL;
1162
1163
1164         if (!device)
1165                 return -EINVAL;
1166
1167         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1168         if (!tz)
1169                 return -ENOMEM;
1170
1171         tz->device = device;
1172         strcpy(tz->name, device->pnp.bus_id);
1173         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1174         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1175         acpi_driver_data(device) = tz;
1176
1177         result = acpi_thermal_get_info(tz);
1178         if (result)
1179                 goto end;
1180
1181         result = acpi_thermal_add_fs(device);
1182         if (result)
1183                 goto end;
1184
1185         init_timer(&tz->timer);
1186
1187         acpi_thermal_check(tz);
1188
1189         status = acpi_install_notify_handler(device->handle,
1190                                              ACPI_DEVICE_NOTIFY,
1191                                              acpi_thermal_notify, tz);
1192         if (ACPI_FAILURE(status)) {
1193                 result = -ENODEV;
1194                 goto end;
1195         }
1196
1197         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1198                acpi_device_name(device), acpi_device_bid(device),
1199                KELVIN_TO_CELSIUS(tz->temperature));
1200
1201       end:
1202         if (result) {
1203                 acpi_thermal_remove_fs(device);
1204                 kfree(tz);
1205         }
1206
1207         return result;
1208 }
1209
1210 static int acpi_thermal_remove(struct acpi_device *device, int type)
1211 {
1212         acpi_status status = AE_OK;
1213         struct acpi_thermal *tz = NULL;
1214
1215
1216         if (!device || !acpi_driver_data(device))
1217                 return -EINVAL;
1218
1219         tz = acpi_driver_data(device);
1220
1221         /* avoid timer adding new defer task */
1222         tz->zombie = 1;
1223         /* wait for running timer (on other CPUs) finish */
1224         del_timer_sync(&(tz->timer));
1225         /* synchronize deferred task */
1226         acpi_os_wait_events_complete(NULL);
1227         /* deferred task may reinsert timer */
1228         del_timer_sync(&(tz->timer));
1229
1230         status = acpi_remove_notify_handler(device->handle,
1231                                             ACPI_DEVICE_NOTIFY,
1232                                             acpi_thermal_notify);
1233
1234         /* Terminate policy */
1235         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1236                 tz->trips.passive.flags.enabled = 0;
1237                 acpi_thermal_passive(tz);
1238         }
1239         if (tz->trips.active[0].flags.valid
1240             && tz->trips.active[0].flags.enabled) {
1241                 tz->trips.active[0].flags.enabled = 0;
1242                 acpi_thermal_active(tz);
1243         }
1244
1245         acpi_thermal_remove_fs(device);
1246
1247         kfree(tz);
1248         return 0;
1249 }
1250
1251 static int acpi_thermal_resume(struct acpi_device *device)
1252 {
1253         struct acpi_thermal *tz = NULL;
1254         int i, j, power_state, result;
1255
1256
1257         if (!device || !acpi_driver_data(device))
1258                 return -EINVAL;
1259
1260         tz = acpi_driver_data(device);
1261
1262         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1263                 if (!(&tz->trips.active[i]))
1264                         break;
1265                 if (!tz->trips.active[i].flags.valid)
1266                         break;
1267                 tz->trips.active[i].flags.enabled = 1;
1268                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1269                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1270                             handles[j], &power_state);
1271                         if (result || (power_state != ACPI_STATE_D0)) {
1272                                 tz->trips.active[i].flags.enabled = 0;
1273                                 break;
1274                         }
1275                 }
1276                 tz->state.active |= tz->trips.active[i].flags.enabled;
1277         }
1278
1279         acpi_thermal_check(tz);
1280
1281         return AE_OK;
1282 }
1283
1284 static int __init acpi_thermal_init(void)
1285 {
1286         int result = 0;
1287
1288
1289         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1290         if (!acpi_thermal_dir)
1291                 return -ENODEV;
1292         acpi_thermal_dir->owner = THIS_MODULE;
1293
1294         result = acpi_bus_register_driver(&acpi_thermal_driver);
1295         if (result < 0) {
1296                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1297                 return -ENODEV;
1298         }
1299
1300         return 0;
1301 }
1302
1303 static void __exit acpi_thermal_exit(void)
1304 {
1305
1306         acpi_bus_unregister_driver(&acpi_thermal_driver);
1307
1308         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1309
1310         return;
1311 }
1312
1313 module_init(acpi_thermal_init);
1314 module_exit(acpi_thermal_exit);