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/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/thermal.h>
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_COMPONENT          0x04000000
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  69 ACPI_MODULE_NAME("thermal");
  70
  71 MODULE_AUTHOR("Paul Diefenbaugh");
  72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  73 MODULE_LICENSE("GPL");
  74
  75 static int act;
  76 module_param(act, int, 0644);
  77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  78
  79 static int crt;
  80 module_param(crt, int, 0644);
  81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  82
  83 static int tzp;
  84 module_param(tzp, int, 0444);
  85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  86
  87 static int nocrt;
  88 module_param(nocrt, int, 0);
  89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  90
  91 static int off;
  92 module_param(off, int, 0);
  93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  94
  95 static int psv;
  96 module_param(psv, int, 0644);
  97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  98
  99 static int acpi_thermal_add(struct acpi_device *device);
 100 static int acpi_thermal_remove(struct acpi_device *device, int type);
 101 static int acpi_thermal_resume(struct acpi_device *device);
 102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 106 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 107                                                const char __user *, size_t,
 108                                                loff_t *);
 109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 111                                           size_t, loff_t *);
 112
 113 static const struct acpi_device_id  thermal_device_ids[] = {
 114         {ACPI_THERMAL_HID, 0},
 115         {"", 0},
 116 };
 117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 118
 119 static struct acpi_driver acpi_thermal_driver = {
 120         .name = "thermal",
 121         .class = ACPI_THERMAL_CLASS,
 122         .ids = thermal_device_ids,
 123         .ops = {
 124                 .add = acpi_thermal_add,
 125                 .remove = acpi_thermal_remove,
 126                 .resume = acpi_thermal_resume,
 127                 },
 128 };
 129
 130 struct acpi_thermal_state {
 131         u8 critical:1;
 132         u8 hot:1;
 133         u8 passive:1;
 134         u8 active:1;
 135         u8 reserved:4;
 136         int active_index;
 137 };
 138
 139 struct acpi_thermal_state_flags {
 140         u8 valid:1;
 141         u8 enabled:1;
 142         u8 reserved:6;
 143 };
 144
 145 struct acpi_thermal_critical {
 146         struct acpi_thermal_state_flags flags;
 147         unsigned long temperature;
 148 };
 149
 150 struct acpi_thermal_hot {
 151         struct acpi_thermal_state_flags flags;
 152         unsigned long temperature;
 153 };
 154
 155 struct acpi_thermal_passive {
 156         struct acpi_thermal_state_flags flags;
 157         unsigned long temperature;
 158         unsigned long tc1;
 159         unsigned long tc2;
 160         unsigned long tsp;
 161         struct acpi_handle_list devices;
 162 };
 163
 164 struct acpi_thermal_active {
 165         struct acpi_thermal_state_flags flags;
 166         unsigned long temperature;
 167         struct acpi_handle_list devices;
 168 };
 169
 170 struct acpi_thermal_trips {
 171         struct acpi_thermal_critical critical;
 172         struct acpi_thermal_hot hot;
 173         struct acpi_thermal_passive passive;
 174         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 175 };
 176
 177 struct acpi_thermal_flags {
 178         u8 cooling_mode:1;      /* _SCP */
 179         u8 devices:1;           /* _TZD */
 180         u8 reserved:6;
 181 };
 182
 183 struct acpi_thermal {
 184         struct acpi_device * device;
 185         acpi_bus_id name;
 186         unsigned long temperature;
 187         unsigned long last_temperature;
 188         unsigned long polling_frequency;
 189         volatile u8 zombie;
 190         struct acpi_thermal_flags flags;
 191         struct acpi_thermal_state state;
 192         struct acpi_thermal_trips trips;
 193         struct acpi_handle_list devices;
 194         struct timer_list timer;
 195         struct thermal_zone_device *thermal_zone;
 196         int tz_enabled;
 197         struct mutex lock;
 198 };
 199
 200 static const struct file_operations acpi_thermal_state_fops = {
 201         .owner = THIS_MODULE,
 202         .open = acpi_thermal_state_open_fs,
 203         .read = seq_read,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static const struct file_operations acpi_thermal_temp_fops = {
 209         .owner = THIS_MODULE,
 210         .open = acpi_thermal_temp_open_fs,
 211         .read = seq_read,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 static const struct file_operations acpi_thermal_trip_fops = {
 217         .owner = THIS_MODULE,
 218         .open = acpi_thermal_trip_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static const struct file_operations acpi_thermal_cooling_fops = {
 225         .owner = THIS_MODULE,
 226         .open = acpi_thermal_cooling_open_fs,
 227         .read = seq_read,
 228         .write = acpi_thermal_write_cooling_mode,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 static const struct file_operations acpi_thermal_polling_fops = {
 234         .owner = THIS_MODULE,
 235         .open = acpi_thermal_polling_open_fs,
 236         .read = seq_read,
 237         .write = acpi_thermal_write_polling,
 238         .llseek = seq_lseek,
 239         .release = single_release,
 240 };
 241
 242 /* --------------------------------------------------------------------------
 243                              Thermal Zone Management
 244    -------------------------------------------------------------------------- */
 245
 246 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 247 {
 248         acpi_status status = AE_OK;
 249
 250
 251         if (!tz)
 252                 return -EINVAL;
 253
 254         tz->last_temperature = tz->temperature;
 255
 256         status =
 257             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 258         if (ACPI_FAILURE(status))
 259                 return -ENODEV;
 260
 261         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 262                           tz->temperature));
 263
 264         return 0;
 265 }
 266
 267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 268 {
 269         acpi_status status = AE_OK;
 270
 271
 272         if (!tz)
 273                 return -EINVAL;
 274
 275         status =
 276             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 277                                   &tz->polling_frequency);
 278         if (ACPI_FAILURE(status))
 279                 return -ENODEV;
 280
 281         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 282                           tz->polling_frequency));
 283
 284         return 0;
 285 }
 286
 287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 288 {
 289
 290         if (!tz)
 291                 return -EINVAL;
 292
 293         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 294
 295         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 296                           "Polling frequency set to %lu seconds\n",
 297                           tz->polling_frequency/10));
 298
 299         return 0;
 300 }
 301
 302 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 303 {
 304         acpi_status status = AE_OK;
 305         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 306         struct acpi_object_list arg_list = { 1, &arg0 };
 307         acpi_handle handle = NULL;
 308
 309
 310         if (!tz)
 311                 return -EINVAL;
 312
 313         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 314         if (ACPI_FAILURE(status)) {
 315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 316                 return -ENODEV;
 317         }
 318
 319         arg0.integer.value = mode;
 320
 321         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 322         if (ACPI_FAILURE(status))
 323                 return -ENODEV;
 324
 325         return 0;
 326 }
 327
 328 #define ACPI_TRIPS_CRITICAL     0x01
 329 #define ACPI_TRIPS_HOT          0x02
 330 #define ACPI_TRIPS_PASSIVE      0x04
 331 #define ACPI_TRIPS_ACTIVE       0x08
 332 #define ACPI_TRIPS_DEVICES      0x10
 333
 334 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 335 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 336
 337 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 338                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 339                               ACPI_TRIPS_DEVICES)
 340
 341 /*
 342  * This exception is thrown out in two cases:
 343  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 344  *   when re-evaluating the AML code.
 345  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 346  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 347  */
 348 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 349 do {    \
 350         if (flags != ACPI_TRIPS_INIT)   \
 351                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 352                 "ACPI thermal trip point %s changed\n"  \
 353                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 354 } while (0)
 355
 356 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 357 {
 358         acpi_status status = AE_OK;
 359         struct acpi_handle_list devices;
 360         int valid = 0;
 361         int i;
 362
 363         /* Critical Shutdown (required) */
 364         if (flag & ACPI_TRIPS_CRITICAL) {
 365                 status = acpi_evaluate_integer(tz->device->handle,
 366                                 "_CRT", NULL, &tz->trips.critical.temperature);
 367                 /*
 368                  * Treat freezing temperatures as invalid as well; some
 369                  * BIOSes return really low values and cause reboots at startup.
 370                  * Below zero (Celcius) values clearly aren't right for sure..
 371                  * ... so lets discard those as invalid.
 372                  */
 373                 if (ACPI_FAILURE(status) ||
 374                                 tz->trips.critical.temperature <= 2732) {
 375                         tz->trips.critical.flags.valid = 0;
 376                         ACPI_EXCEPTION((AE_INFO, status,
 377                                         "No or invalid critical threshold"));
 378                         return -ENODEV;
 379                 } else {
 380                         tz->trips.critical.flags.valid = 1;
 381                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 382                                         "Found critical threshold [%lu]\n",
 383                                         tz->trips.critical.temperature));
 384                 }
 385                 if (tz->trips.critical.flags.valid == 1) {
 386                         if (crt == -1) {
 387                                 tz->trips.critical.flags.valid = 0;
 388                         } else if (crt > 0) {
 389                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 390                                 /*
 391                                  * Allow override to lower critical threshold
 392                                  */
 393                                 if (crt_k < tz->trips.critical.temperature)
 394                                         tz->trips.critical.temperature = crt_k;
 395                         }
 396                 }
 397         }
 398
 399         /* Critical Sleep (optional) */
 400         if (flag & ACPI_TRIPS_HOT) {
 401                 status = acpi_evaluate_integer(tz->device->handle,
 402                                 "_HOT", NULL, &tz->trips.hot.temperature);
 403                 if (ACPI_FAILURE(status)) {
 404                         tz->trips.hot.flags.valid = 0;
 405                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 406                                         "No hot threshold\n"));
 407                 } else {
 408                         tz->trips.hot.flags.valid = 1;
 409                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 410                                         "Found hot threshold [%lu]\n",
 411                                         tz->trips.critical.temperature));
 412                 }
 413         }
 414
 415         /* Passive (optional) */
 416         if (flag & ACPI_TRIPS_PASSIVE) {
 417                 valid = tz->trips.passive.flags.valid;
 418                 if (psv == -1) {
 419                         status = AE_SUPPORT;
 420                 } else if (psv > 0) {
 421                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 422                         status = AE_OK;
 423                 } else {
 424                         status = acpi_evaluate_integer(tz->device->handle,
 425                                 "_PSV", NULL, &tz->trips.passive.temperature);
 426                 }
 427
 428                 if (ACPI_FAILURE(status))
 429                         tz->trips.passive.flags.valid = 0;
 430                 else {
 431                         tz->trips.passive.flags.valid = 1;
 432                         if (flag == ACPI_TRIPS_INIT) {
 433                                 status = acpi_evaluate_integer(
 434                                                 tz->device->handle, "_TC1",
 435                                                 NULL, &tz->trips.passive.tc1);
 436                                 if (ACPI_FAILURE(status))
 437                                         tz->trips.passive.flags.valid = 0;
 438                                 status = acpi_evaluate_integer(
 439                                                 tz->device->handle, "_TC2",
 440                                                 NULL, &tz->trips.passive.tc2);
 441                                 if (ACPI_FAILURE(status))
 442                                         tz->trips.passive.flags.valid = 0;
 443                                 status = acpi_evaluate_integer(
 444                                                 tz->device->handle, "_TSP",
 445                                                 NULL, &tz->trips.passive.tsp);
 446                                 if (ACPI_FAILURE(status))
 447                                         tz->trips.passive.flags.valid = 0;
 448                         }
 449                 }
 450         }
 451         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 452                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 453                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 454                                                         NULL, &devices);
 455                 if (ACPI_FAILURE(status))
 456                         tz->trips.passive.flags.valid = 0;
 457                 else
 458                         tz->trips.passive.flags.valid = 1;
 459
 460                 if (memcmp(&tz->trips.passive.devices, &devices,
 461                                 sizeof(struct acpi_handle_list))) {
 462                         memcpy(&tz->trips.passive.devices, &devices,
 463                                 sizeof(struct acpi_handle_list));
 464                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 465                 }
 466         }
 467         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 468                 if (valid != tz->trips.passive.flags.valid)
 469                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 470         }
 471
 472         /* Active (optional) */
 473         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 474                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 475                 valid = tz->trips.active[i].flags.valid;
 476
 477                 if (act == -1)
 478                         break; /* disable all active trip points */
 479
 480                 if (flag & ACPI_TRIPS_ACTIVE) {
 481                         status = acpi_evaluate_integer(tz->device->handle,
 482                                 name, NULL, &tz->trips.active[i].temperature);
 483                         if (ACPI_FAILURE(status)) {
 484                                 tz->trips.active[i].flags.valid = 0;
 485                                 if (i == 0)
 486                                         break;
 487                                 if (act <= 0)
 488                                         break;
 489                                 if (i == 1)
 490                                         tz->trips.active[0].temperature =
 491                                                 CELSIUS_TO_KELVIN(act);
 492                                 else
 493                                         /*
 494                                          * Don't allow override higher than
 495                                          * the next higher trip point
 496                                          */
 497                                         tz->trips.active[i - 1].temperature =
 498                                                 (tz->trips.active[i - 2].temperature <
 499                                                 CELSIUS_TO_KELVIN(act) ?
 500                                                 tz->trips.active[i - 2].temperature :
 501                                                 CELSIUS_TO_KELVIN(act));
 502                                 break;
 503                         } else
 504                                 tz->trips.active[i].flags.valid = 1;
 505                 }
 506
 507                 name[2] = 'L';
 508                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 509                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 510                         status = acpi_evaluate_reference(tz->device->handle,
 511                                                 name, NULL, &devices);
 512                         if (ACPI_FAILURE(status))
 513                                 tz->trips.active[i].flags.valid = 0;
 514                         else
 515                                 tz->trips.active[i].flags.valid = 1;
 516
 517                         if (memcmp(&tz->trips.active[i].devices, &devices,
 518                                         sizeof(struct acpi_handle_list))) {
 519                                 memcpy(&tz->trips.active[i].devices, &devices,
 520                                         sizeof(struct acpi_handle_list));
 521                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 522                         }
 523                 }
 524                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 525                         if (valid != tz->trips.active[i].flags.valid)
 526                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 527
 528                 if (!tz->trips.active[i].flags.valid)
 529                         break;
 530         }
 531
 532         if (flag & ACPI_TRIPS_DEVICES) {
 533                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 534                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 535                                                 NULL, &devices);
 536                 if (memcmp(&tz->devices, &devices,
 537                                 sizeof(struct acpi_handle_list))) {
 538                         memcpy(&tz->devices, &devices,
 539                                 sizeof(struct acpi_handle_list));
 540                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 541                 }
 542         }
 543
 544         return 0;
 545 }
 546
 547 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 548 {
 549         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 550 }
 551
 552 static int acpi_thermal_critical(struct acpi_thermal *tz)
 553 {
 554         if (!tz || !tz->trips.critical.flags.valid)
 555                 return -EINVAL;
 556
 557         if (tz->temperature >= tz->trips.critical.temperature) {
 558                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 559                 tz->trips.critical.flags.enabled = 1;
 560         } else if (tz->trips.critical.flags.enabled)
 561                 tz->trips.critical.flags.enabled = 0;
 562
 563         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 564                                 tz->trips.critical.flags.enabled);
 565         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 566                                           tz->device->dev.bus_id,
 567                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 568                                           tz->trips.critical.flags.enabled);
 569
 570         /* take no action if nocrt is set */
 571         if(!nocrt) {
 572                 printk(KERN_EMERG
 573                         "Critical temperature reached (%ld C), shutting down.\n",
 574                         KELVIN_TO_CELSIUS(tz->temperature));
 575                 orderly_poweroff(true);
 576         }
 577
 578         return 0;
 579 }
 580
 581 static int acpi_thermal_hot(struct acpi_thermal *tz)
 582 {
 583         if (!tz || !tz->trips.hot.flags.valid)
 584                 return -EINVAL;
 585
 586         if (tz->temperature >= tz->trips.hot.temperature) {
 587                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 588                 tz->trips.hot.flags.enabled = 1;
 589         } else if (tz->trips.hot.flags.enabled)
 590                 tz->trips.hot.flags.enabled = 0;
 591
 592         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 593                                 tz->trips.hot.flags.enabled);
 594         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 595                                           tz->device->dev.bus_id,
 596                                           ACPI_THERMAL_NOTIFY_HOT,
 597                                           tz->trips.hot.flags.enabled);
 598
 599         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 600
 601         return 0;
 602 }
 603
 604 static void acpi_thermal_passive(struct acpi_thermal *tz)
 605 {
 606         int result = 1;
 607         struct acpi_thermal_passive *passive = NULL;
 608         int trend = 0;
 609         int i = 0;
 610
 611
 612         if (!tz || !tz->trips.passive.flags.valid)
 613                 return;
 614
 615         passive = &(tz->trips.passive);
 616
 617         /*
 618          * Above Trip?
 619          * -----------
 620          * Calculate the thermal trend (using the passive cooling equation)
 621          * and modify the performance limit for all passive cooling devices
 622          * accordingly.  Note that we assume symmetry.
 623          */
 624         if (tz->temperature >= passive->temperature) {
 625                 trend =
 626                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 627                     (passive->tc2 * (tz->temperature - passive->temperature));
 628                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 629                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 630                                   trend, passive->tc1, tz->temperature,
 631                                   tz->last_temperature, passive->tc2,
 632                                   tz->temperature, passive->temperature));
 633                 passive->flags.enabled = 1;
 634                 /* Heating up? */
 635                 if (trend > 0)
 636                         for (i = 0; i < passive->devices.count; i++)
 637                                 acpi_processor_set_thermal_limit(passive->
 638                                                                  devices.
 639                                                                  handles[i],
 640                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 641                 /* Cooling off? */
 642                 else if (trend < 0) {
 643                         for (i = 0; i < passive->devices.count; i++)
 644                                 /*
 645                                  * assume that we are on highest
 646                                  * freq/lowest thrott and can leave
 647                                  * passive mode, even in error case
 648                                  */
 649                                 if (!acpi_processor_set_thermal_limit
 650                                     (passive->devices.handles[i],
 651                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 652                                         result = 0;
 653                         /*
 654                          * Leave cooling mode, even if the temp might
 655                          * higher than trip point This is because some
 656                          * machines might have long thermal polling
 657                          * frequencies (tsp) defined. We will fall back
 658                          * into passive mode in next cycle (probably quicker)
 659                          */
 660                         if (result) {
 661                                 passive->flags.enabled = 0;
 662                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 663                                                   "Disabling passive cooling, still above threshold,"
 664                                                   " but we are cooling down\n"));
 665                         }
 666                 }
 667                 return;
 668         }
 669
 670         /*
 671          * Below Trip?
 672          * -----------
 673          * Implement passive cooling hysteresis to slowly increase performance
 674          * and avoid thrashing around the passive trip point.  Note that we
 675          * assume symmetry.
 676          */
 677         if (!passive->flags.enabled)
 678                 return;
 679         for (i = 0; i < passive->devices.count; i++)
 680                 if (!acpi_processor_set_thermal_limit
 681                     (passive->devices.handles[i],
 682                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 683                         result = 0;
 684         if (result) {
 685                 passive->flags.enabled = 0;
 686                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 687                                   "Disabling passive cooling (zone is cool)\n"));
 688         }
 689 }
 690
 691 static void acpi_thermal_active(struct acpi_thermal *tz)
 692 {
 693         int result = 0;
 694         struct acpi_thermal_active *active = NULL;
 695         int i = 0;
 696         int j = 0;
 697         unsigned long maxtemp = 0;
 698
 699
 700         if (!tz)
 701                 return;
 702
 703         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 704                 active = &(tz->trips.active[i]);
 705                 if (!active || !active->flags.valid)
 706                         break;
 707                 if (tz->temperature >= active->temperature) {
 708                         /*
 709                          * Above Threshold?
 710                          * ----------------
 711                          * If not already enabled, turn ON all cooling devices
 712                          * associated with this active threshold.
 713                          */
 714                         if (active->temperature > maxtemp)
 715                                 tz->state.active_index = i;
 716                         maxtemp = active->temperature;
 717                         if (active->flags.enabled)
 718                                 continue;
 719                         for (j = 0; j < active->devices.count; j++) {
 720                                 result =
 721                                     acpi_bus_set_power(active->devices.
 722                                                        handles[j],
 723                                                        ACPI_STATE_D0);
 724                                 if (result) {
 725                                         printk(KERN_WARNING PREFIX
 726                                                       "Unable to turn cooling device [%p] 'on'\n",
 727                                                       active->devices.
 728                                                       handles[j]);
 729                                         continue;
 730                                 }
 731                                 active->flags.enabled = 1;
 732                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 733                                                   "Cooling device [%p] now 'on'\n",
 734                                                   active->devices.handles[j]));
 735                         }
 736                         continue;
 737                 }
 738                 if (!active->flags.enabled)
 739                         continue;
 740                 /*
 741                  * Below Threshold?
 742                  * ----------------
 743                  * Turn OFF all cooling devices associated with this
 744                  * threshold.
 745                  */
 746                 for (j = 0; j < active->devices.count; j++) {
 747                         result = acpi_bus_set_power(active->devices.handles[j],
 748                                                     ACPI_STATE_D3);
 749                         if (result) {
 750                                 printk(KERN_WARNING PREFIX
 751                                               "Unable to turn cooling device [%p] 'off'\n",
 752                                               active->devices.handles[j]);
 753                                 continue;
 754                         }
 755                         active->flags.enabled = 0;
 756                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 757                                           "Cooling device [%p] now 'off'\n",
 758                                           active->devices.handles[j]));
 759                 }
 760         }
 761 }
 762
 763 static void acpi_thermal_check(void *context);
 764
 765 static void acpi_thermal_run(unsigned long data)
 766 {
 767         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 768         if (!tz->zombie)
 769                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 770 }
 771
 772 static void acpi_thermal_check(void *data)
 773 {
 774         int result = 0;
 775         struct acpi_thermal *tz = data;
 776         unsigned long sleep_time = 0;
 777         unsigned long timeout_jiffies = 0;
 778         int i = 0;
 779         struct acpi_thermal_state state;
 780
 781
 782         if (!tz) {
 783                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 784                 return;
 785         }
 786
 787         /* Check if someone else is already running */
 788         if (!mutex_trylock(&tz->lock))
 789                 return;
 790
 791         state = tz->state;
 792
 793         result = acpi_thermal_get_temperature(tz);
 794         if (result)
 795                 goto unlock;
 796
 797         if (!tz->tz_enabled)
 798                 goto unlock;
 799
 800         memset(&tz->state, 0, sizeof(tz->state));
 801
 802         /*
 803          * Check Trip Points
 804          * -----------------
 805          * Compare the current temperature to the trip point values to see
 806          * if we've entered one of the thermal policy states.  Note that
 807          * this function determines when a state is entered, but the
 808          * individual policy decides when it is exited (e.g. hysteresis).
 809          */
 810         if (tz->trips.critical.flags.valid)
 811                 state.critical |=
 812                     (tz->temperature >= tz->trips.critical.temperature);
 813         if (tz->trips.hot.flags.valid)
 814                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 815         if (tz->trips.passive.flags.valid)
 816                 state.passive |=
 817                     (tz->temperature >= tz->trips.passive.temperature);
 818         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 819                 if (tz->trips.active[i].flags.valid)
 820                         state.active |=
 821                             (tz->temperature >=
 822                              tz->trips.active[i].temperature);
 823
 824         /*
 825          * Invoke Policy
 826          * -------------
 827          * Separated from the above check to allow individual policy to
 828          * determine when to exit a given state.
 829          */
 830         if (state.critical)
 831                 acpi_thermal_critical(tz);
 832         if (state.hot)
 833                 acpi_thermal_hot(tz);
 834         if (state.passive)
 835                 acpi_thermal_passive(tz);
 836         if (state.active)
 837                 acpi_thermal_active(tz);
 838
 839         /*
 840          * Calculate State
 841          * ---------------
 842          * Again, separated from the above two to allow independent policy
 843          * decisions.
 844          */
 845         tz->state.critical = tz->trips.critical.flags.enabled;
 846         tz->state.hot = tz->trips.hot.flags.enabled;
 847         tz->state.passive = tz->trips.passive.flags.enabled;
 848         tz->state.active = 0;
 849         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 850                 tz->state.active |= tz->trips.active[i].flags.enabled;
 851
 852         /*
 853          * Calculate Sleep Time
 854          * --------------------
 855          * If we're in the passive state, use _TSP's value.  Otherwise
 856          * use the default polling frequency (e.g. _TZP).  If no polling
 857          * frequency is specified then we'll wait forever (at least until
 858          * a thermal event occurs).  Note that _TSP and _TZD values are
 859          * given in 1/10th seconds (we must covert to milliseconds).
 860          */
 861         if (tz->state.passive) {
 862                 sleep_time = tz->trips.passive.tsp * 100;
 863                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 864         } else if (tz->polling_frequency > 0) {
 865                 sleep_time = tz->polling_frequency * 100;
 866                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 867         }
 868
 869         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 870                           tz->name, tz->temperature, sleep_time));
 871
 872         /*
 873          * Schedule Next Poll
 874          * ------------------
 875          */
 876         if (!sleep_time) {
 877                 if (timer_pending(&(tz->timer)))
 878                         del_timer(&(tz->timer));
 879         } else {
 880                 if (timer_pending(&(tz->timer)))
 881                         mod_timer(&(tz->timer), timeout_jiffies);
 882                 else {
 883                         tz->timer.data = (unsigned long)tz;
 884                         tz->timer.function = acpi_thermal_run;
 885                         tz->timer.expires = timeout_jiffies;
 886                         add_timer(&(tz->timer));
 887                 }
 888         }
 889       unlock:
 890         mutex_unlock(&tz->lock);
 891 }
 892
 893 /* sys I/F for generic thermal sysfs support */
 894 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 895
 896 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 897 {
 898         struct acpi_thermal *tz = thermal->devdata;
 899         int result;
 900
 901         if (!tz)
 902                 return -EINVAL;
 903
 904         result = acpi_thermal_get_temperature(tz);
 905         if (result)
 906                 return result;
 907
 908         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
 909 }
 910
 911 static const char enabled[] = "kernel";
 912 static const char disabled[] = "user";
 913 static int thermal_get_mode(struct thermal_zone_device *thermal,
 914                                 char *buf)
 915 {
 916         struct acpi_thermal *tz = thermal->devdata;
 917
 918         if (!tz)
 919                 return -EINVAL;
 920
 921         return sprintf(buf, "%s\n", tz->tz_enabled ?
 922                         enabled : disabled);
 923 }
 924
 925 static int thermal_set_mode(struct thermal_zone_device *thermal,
 926                                 const char *buf)
 927 {
 928         struct acpi_thermal *tz = thermal->devdata;
 929         int enable;
 930
 931         if (!tz)
 932                 return -EINVAL;
 933
 934         /*
 935          * enable/disable thermal management from ACPI thermal driver
 936          */
 937         if (!strncmp(buf, enabled, sizeof enabled - 1))
 938                 enable = 1;
 939         else if (!strncmp(buf, disabled, sizeof disabled - 1))
 940                 enable = 0;
 941         else
 942                 return -EINVAL;
 943
 944         if (enable != tz->tz_enabled) {
 945                 tz->tz_enabled = enable;
 946                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 947                         "%s ACPI thermal control\n",
 948                         tz->tz_enabled ? enabled : disabled));
 949                 acpi_thermal_check(tz);
 950         }
 951         return 0;
 952 }
 953
 954 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 955                                  int trip, char *buf)
 956 {
 957         struct acpi_thermal *tz = thermal->devdata;
 958         int i;
 959
 960         if (!tz || trip < 0)
 961                 return -EINVAL;
 962
 963         if (tz->trips.critical.flags.valid) {
 964                 if (!trip)
 965                         return sprintf(buf, "critical\n");
 966                 trip--;
 967         }
 968
 969         if (tz->trips.hot.flags.valid) {
 970                 if (!trip)
 971                         return sprintf(buf, "hot\n");
 972                 trip--;
 973         }
 974
 975         if (tz->trips.passive.flags.valid) {
 976                 if (!trip)
 977                         return sprintf(buf, "passive\n");
 978                 trip--;
 979         }
 980
 981         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 982                 tz->trips.active[i].flags.valid; i++) {
 983                 if (!trip)
 984                         return sprintf(buf, "active%d\n", i);
 985                 trip--;
 986         }
 987
 988         return -EINVAL;
 989 }
 990
 991 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 992                                  int trip, char *buf)
 993 {
 994         struct acpi_thermal *tz = thermal->devdata;
 995         int i;
 996
 997         if (!tz || trip < 0)
 998                 return -EINVAL;
 999
1000         if (tz->trips.critical.flags.valid) {
1001                 if (!trip)
1002                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1003                                 tz->trips.critical.temperature));
1004                 trip--;
1005         }
1006
1007         if (tz->trips.hot.flags.valid) {
1008                 if (!trip)
1009                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1010                                         tz->trips.hot.temperature));
1011                 trip--;
1012         }
1013
1014         if (tz->trips.passive.flags.valid) {
1015                 if (!trip)
1016                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1017                                         tz->trips.passive.temperature));
1018                 trip--;
1019         }
1020
1021         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1022                 tz->trips.active[i].flags.valid; i++) {
1023                 if (!trip)
1024                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1025                                         tz->trips.active[i].temperature));
1026                 trip--;
1027         }
1028
1029         return -EINVAL;
1030 }
1031
1032 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1033                                 unsigned long *temperature) {
1034         struct acpi_thermal *tz = thermal->devdata;
1035
1036         if (tz->trips.critical.flags.valid) {
1037                 *temperature = KELVIN_TO_MILLICELSIUS(
1038                                 tz->trips.critical.temperature);
1039                 return 0;
1040         } else
1041                 return -EINVAL;
1042 }
1043
1044 typedef int (*cb)(struct thermal_zone_device *, int,
1045                   struct thermal_cooling_device *);
1046 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1047                                         struct thermal_cooling_device *cdev,
1048                                         cb action)
1049 {
1050         struct acpi_device *device = cdev->devdata;
1051         struct acpi_thermal *tz = thermal->devdata;
1052         struct acpi_device *dev;
1053         acpi_status status;
1054         acpi_handle handle;
1055         int i;
1056         int j;
1057         int trip = -1;
1058         int result = 0;
1059
1060         if (tz->trips.critical.flags.valid)
1061                 trip++;
1062
1063         if (tz->trips.hot.flags.valid)
1064                 trip++;
1065
1066         if (tz->trips.passive.flags.valid) {
1067                 trip++;
1068                 for (i = 0; i < tz->trips.passive.devices.count;
1069                     i++) {
1070                         handle = tz->trips.passive.devices.handles[i];
1071                         status = acpi_bus_get_device(handle, &dev);
1072                         if (ACPI_SUCCESS(status) && (dev == device)) {
1073                                 result = action(thermal, trip, cdev);
1074                                 if (result)
1075                                         goto failed;
1076                         }
1077                 }
1078         }
1079
1080         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1081                 if (!tz->trips.active[i].flags.valid)
1082                         break;
1083                 trip++;
1084                 for (j = 0;
1085                     j < tz->trips.active[i].devices.count;
1086                     j++) {
1087                         handle = tz->trips.active[i].devices.handles[j];
1088                         status = acpi_bus_get_device(handle, &dev);
1089                         if (ACPI_SUCCESS(status) && (dev == device)) {
1090                                 result = action(thermal, trip, cdev);
1091                                 if (result)
1092                                         goto failed;
1093                         }
1094                 }
1095         }
1096
1097         for (i = 0; i < tz->devices.count; i++) {
1098                 handle = tz->devices.handles[i];
1099                 status = acpi_bus_get_device(handle, &dev);
1100                 if (ACPI_SUCCESS(status) && (dev == device)) {
1101                         result = action(thermal, -1, cdev);
1102                         if (result)
1103                                 goto failed;
1104                 }
1105         }
1106
1107 failed:
1108         return result;
1109 }
1110
1111 static int
1112 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1113                                         struct thermal_cooling_device *cdev)
1114 {
1115         return acpi_thermal_cooling_device_cb(thermal, cdev,
1116                                 thermal_zone_bind_cooling_device);
1117 }
1118
1119 static int
1120 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1121                                         struct thermal_cooling_device *cdev)
1122 {
1123         return acpi_thermal_cooling_device_cb(thermal, cdev,
1124                                 thermal_zone_unbind_cooling_device);
1125 }
1126
1127 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1128         .bind = acpi_thermal_bind_cooling_device,
1129         .unbind = acpi_thermal_unbind_cooling_device,
1130         .get_temp = thermal_get_temp,
1131         .get_mode = thermal_get_mode,
1132         .set_mode = thermal_set_mode,
1133         .get_trip_type = thermal_get_trip_type,
1134         .get_trip_temp = thermal_get_trip_temp,
1135         .get_crit_temp = thermal_get_crit_temp,
1136 };
1137
1138 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1139 {
1140         int trips = 0;
1141         int result;
1142         acpi_status status;
1143         int i;
1144
1145         if (tz->trips.critical.flags.valid)
1146                 trips++;
1147
1148         if (tz->trips.hot.flags.valid)
1149                 trips++;
1150
1151         if (tz->trips.passive.flags.valid)
1152                 trips++;
1153
1154         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1155                         tz->trips.active[i].flags.valid; i++, trips++);
1156         tz->thermal_zone = thermal_zone_device_register("acpitz",
1157                                         trips, tz, &acpi_thermal_zone_ops);
1158         if (IS_ERR(tz->thermal_zone))
1159                 return -ENODEV;
1160
1161         result = sysfs_create_link(&tz->device->dev.kobj,
1162                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1163         if (result)
1164                 return result;
1165
1166         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1167                                    &tz->device->dev.kobj, "device");
1168         if (result)
1169                 return result;
1170
1171         status = acpi_attach_data(tz->device->handle,
1172                                   acpi_bus_private_data_handler,
1173                                   tz->thermal_zone);
1174         if (ACPI_FAILURE(status)) {
1175                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1176                                 "Error attaching device data\n"));
1177                 return -ENODEV;
1178         }
1179
1180         tz->tz_enabled = 1;
1181
1182         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1183                         tz->device->dev.bus_id, tz->thermal_zone->id);
1184         return 0;
1185 }
1186
1187 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1188 {
1189         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1190         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1191         thermal_zone_device_unregister(tz->thermal_zone);
1192         tz->thermal_zone = NULL;
1193         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1194 }
1195
1196
1197 /* --------------------------------------------------------------------------
1198                               FS Interface (/proc)
1199    -------------------------------------------------------------------------- */
1200
1201 static struct proc_dir_entry *acpi_thermal_dir;
1202
1203 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1204 {
1205         struct acpi_thermal *tz = seq->private;
1206
1207
1208         if (!tz)
1209                 goto end;
1210
1211         seq_puts(seq, "state:                   ");
1212
1213         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1214             && !tz->state.active)
1215                 seq_puts(seq, "ok\n");
1216         else {
1217                 if (tz->state.critical)
1218                         seq_puts(seq, "critical ");
1219                 if (tz->state.hot)
1220                         seq_puts(seq, "hot ");
1221                 if (tz->state.passive)
1222                         seq_puts(seq, "passive ");
1223                 if (tz->state.active)
1224                         seq_printf(seq, "active[%d]", tz->state.active_index);
1225                 seq_puts(seq, "\n");
1226         }
1227
1228       end:
1229         return 0;
1230 }
1231
1232 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1233 {
1234         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1235 }
1236
1237 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1238 {
1239         int result = 0;
1240         struct acpi_thermal *tz = seq->private;
1241
1242
1243         if (!tz)
1244                 goto end;
1245
1246         result = acpi_thermal_get_temperature(tz);
1247         if (result)
1248                 goto end;
1249
1250         seq_printf(seq, "temperature:             %ld C\n",
1251                    KELVIN_TO_CELSIUS(tz->temperature));
1252
1253       end:
1254         return 0;
1255 }
1256
1257 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1258 {
1259         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1260 }
1261
1262 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1263 {
1264         struct acpi_thermal *tz = seq->private;
1265         struct acpi_device *device;
1266         acpi_status status;
1267
1268         int i = 0;
1269         int j = 0;
1270
1271
1272         if (!tz)
1273                 goto end;
1274
1275         if (tz->trips.critical.flags.valid)
1276                 seq_printf(seq, "critical (S5):           %ld C%s",
1277                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1278                            nocrt ? " <disabled>\n" : "\n");
1279
1280         if (tz->trips.hot.flags.valid)
1281                 seq_printf(seq, "hot (S4):                %ld C%s",
1282                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1283                            nocrt ? " <disabled>\n" : "\n");
1284
1285         if (tz->trips.passive.flags.valid) {
1286                 seq_printf(seq,
1287                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1288                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1289                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1290                            tz->trips.passive.tsp);
1291                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1292                         status = acpi_bus_get_device(tz->trips.passive.devices.
1293                                                      handles[j], &device);
1294                         seq_printf(seq, "%4.4s ", status ? "" :
1295                                    acpi_device_bid(device));
1296                 }
1297                 seq_puts(seq, "\n");
1298         }
1299
1300         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1301                 if (!(tz->trips.active[i].flags.valid))
1302                         break;
1303                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1304                            i,
1305                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1306                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1307                         status = acpi_bus_get_device(tz->trips.active[i].
1308                                                      devices.handles[j],
1309                                                      &device);
1310                         seq_printf(seq, "%4.4s ", status ? "" :
1311                                    acpi_device_bid(device));
1312                 }
1313                 seq_puts(seq, "\n");
1314         }
1315
1316       end:
1317         return 0;
1318 }
1319
1320 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1321 {
1322         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1323 }
1324
1325 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1326 {
1327         struct acpi_thermal *tz = seq->private;
1328
1329
1330         if (!tz)
1331                 goto end;
1332
1333         if (!tz->flags.cooling_mode)
1334                 seq_puts(seq, "<setting not supported>\n");
1335         else
1336                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1337
1338       end:
1339         return 0;
1340 }
1341
1342 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1343 {
1344         return single_open(file, acpi_thermal_cooling_seq_show,
1345                            PDE(inode)->data);
1346 }
1347
1348 static ssize_t
1349 acpi_thermal_write_cooling_mode(struct file *file,
1350                                 const char __user * buffer,
1351                                 size_t count, loff_t * ppos)
1352 {
1353         struct seq_file *m = file->private_data;
1354         struct acpi_thermal *tz = m->private;
1355         int result = 0;
1356         char mode_string[12] = { '\0' };
1357
1358
1359         if (!tz || (count > sizeof(mode_string) - 1))
1360                 return -EINVAL;
1361
1362         if (!tz->flags.cooling_mode)
1363                 return -ENODEV;
1364
1365         if (copy_from_user(mode_string, buffer, count))
1366                 return -EFAULT;
1367
1368         mode_string[count] = '\0';
1369
1370         result = acpi_thermal_set_cooling_mode(tz,
1371                                                simple_strtoul(mode_string, NULL,
1372                                                               0));
1373         if (result)
1374                 return result;
1375
1376         acpi_thermal_check(tz);
1377
1378         return count;
1379 }
1380
1381 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1382 {
1383         struct acpi_thermal *tz = seq->private;
1384
1385
1386         if (!tz)
1387                 goto end;
1388
1389         if (!tz->polling_frequency) {
1390                 seq_puts(seq, "<polling disabled>\n");
1391                 goto end;
1392         }
1393
1394         seq_printf(seq, "polling frequency:       %lu seconds\n",
1395                    (tz->polling_frequency / 10));
1396
1397       end:
1398         return 0;
1399 }
1400
1401 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1402 {
1403         return single_open(file, acpi_thermal_polling_seq_show,
1404                            PDE(inode)->data);
1405 }
1406
1407 static ssize_t
1408 acpi_thermal_write_polling(struct file *file,
1409                            const char __user * buffer,
1410                            size_t count, loff_t * ppos)
1411 {
1412         struct seq_file *m = file->private_data;
1413         struct acpi_thermal *tz = m->private;
1414         int result = 0;
1415         char polling_string[12] = { '\0' };
1416         int seconds = 0;
1417
1418
1419         if (!tz || (count > sizeof(polling_string) - 1))
1420                 return -EINVAL;
1421
1422         if (copy_from_user(polling_string, buffer, count))
1423                 return -EFAULT;
1424
1425         polling_string[count] = '\0';
1426
1427         seconds = simple_strtoul(polling_string, NULL, 0);
1428
1429         result = acpi_thermal_set_polling(tz, seconds);
1430         if (result)
1431                 return result;
1432
1433         acpi_thermal_check(tz);
1434
1435         return count;
1436 }
1437
1438 static int acpi_thermal_add_fs(struct acpi_device *device)
1439 {
1440         struct proc_dir_entry *entry = NULL;
1441
1442
1443         if (!acpi_device_dir(device)) {
1444                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1445                                                      acpi_thermal_dir);
1446                 if (!acpi_device_dir(device))
1447                         return -ENODEV;
1448                 acpi_device_dir(device)->owner = THIS_MODULE;
1449         }
1450
1451         /* 'state' [R] */
1452         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1453                                  S_IRUGO, acpi_device_dir(device),
1454                                  &acpi_thermal_state_fops,
1455                                  acpi_driver_data(device));
1456         if (!entry)
1457                 return -ENODEV;
1458
1459         /* 'temperature' [R] */
1460         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1461                                  S_IRUGO, acpi_device_dir(device),
1462                                  &acpi_thermal_temp_fops,
1463                                  acpi_driver_data(device));
1464         if (!entry)
1465                 return -ENODEV;
1466
1467         /* 'trip_points' [R] */
1468         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1469                                  S_IRUGO,
1470                                  acpi_device_dir(device),
1471                                  &acpi_thermal_trip_fops,
1472                                  acpi_driver_data(device));
1473         if (!entry)
1474                 return -ENODEV;
1475
1476         /* 'cooling_mode' [R/W] */
1477         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1478                                  S_IFREG | S_IRUGO | S_IWUSR,
1479                                  acpi_device_dir(device),
1480                                  &acpi_thermal_cooling_fops,
1481                                  acpi_driver_data(device));
1482         if (!entry)
1483                 return -ENODEV;
1484
1485         /* 'polling_frequency' [R/W] */
1486         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1487                                  S_IFREG | S_IRUGO | S_IWUSR,
1488                                  acpi_device_dir(device),
1489                                  &acpi_thermal_polling_fops,
1490                                  acpi_driver_data(device));
1491         if (!entry)
1492                 return -ENODEV;
1493         return 0;
1494 }
1495
1496 static int acpi_thermal_remove_fs(struct acpi_device *device)
1497 {
1498
1499         if (acpi_device_dir(device)) {
1500                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1501                                   acpi_device_dir(device));
1502                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1503                                   acpi_device_dir(device));
1504                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1505                                   acpi_device_dir(device));
1506                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1507                                   acpi_device_dir(device));
1508                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1509                                   acpi_device_dir(device));
1510                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1511                 acpi_device_dir(device) = NULL;
1512         }
1513
1514         return 0;
1515 }
1516
1517 /* --------------------------------------------------------------------------
1518                                  Driver Interface
1519    -------------------------------------------------------------------------- */
1520
1521 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1522 {
1523         struct acpi_thermal *tz = data;
1524         struct acpi_device *device = NULL;
1525
1526
1527         if (!tz)
1528                 return;
1529
1530         device = tz->device;
1531
1532         switch (event) {
1533         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1534                 acpi_thermal_check(tz);
1535                 break;
1536         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1537                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1538                 acpi_thermal_check(tz);
1539                 acpi_bus_generate_proc_event(device, event, 0);
1540                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1541                                                   device->dev.bus_id, event, 0);
1542                 break;
1543         case ACPI_THERMAL_NOTIFY_DEVICES:
1544                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1545                 acpi_thermal_check(tz);
1546                 acpi_bus_generate_proc_event(device, event, 0);
1547                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1548                                                   device->dev.bus_id, event, 0);
1549                 break;
1550         default:
1551                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1552                                   "Unsupported event [0x%x]\n", event));
1553                 break;
1554         }
1555
1556         return;
1557 }
1558
1559 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1560 {
1561         int result = 0;
1562
1563
1564         if (!tz)
1565                 return -EINVAL;
1566
1567         /* Get temperature [_TMP] (required) */
1568         result = acpi_thermal_get_temperature(tz);
1569         if (result)
1570                 return result;
1571
1572         /* Get trip points [_CRT, _PSV, etc.] (required) */
1573         result = acpi_thermal_get_trip_points(tz);
1574         if (result)
1575                 return result;
1576
1577         /* Set the cooling mode [_SCP] to active cooling (default) */
1578         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1579         if (!result)
1580                 tz->flags.cooling_mode = 1;
1581
1582         /* Get default polling frequency [_TZP] (optional) */
1583         if (tzp)
1584                 tz->polling_frequency = tzp;
1585         else
1586                 acpi_thermal_get_polling_frequency(tz);
1587
1588         return 0;
1589 }
1590
1591 static int acpi_thermal_add(struct acpi_device *device)
1592 {
1593         int result = 0;
1594         acpi_status status = AE_OK;
1595         struct acpi_thermal *tz = NULL;
1596
1597
1598         if (!device)
1599                 return -EINVAL;
1600
1601         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1602         if (!tz)
1603                 return -ENOMEM;
1604
1605         tz->device = device;
1606         strcpy(tz->name, device->pnp.bus_id);
1607         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1608         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1609         acpi_driver_data(device) = tz;
1610         mutex_init(&tz->lock);
1611
1612
1613         result = acpi_thermal_get_info(tz);
1614         if (result)
1615                 goto free_memory;
1616
1617         result = acpi_thermal_register_thermal_zone(tz);
1618         if (result)
1619                 goto free_memory;
1620
1621         result = acpi_thermal_add_fs(device);
1622         if (result)
1623                 goto unregister_thermal_zone;
1624
1625         init_timer(&tz->timer);
1626
1627         acpi_thermal_check(tz);
1628
1629         status = acpi_install_notify_handler(device->handle,
1630                                              ACPI_DEVICE_NOTIFY,
1631                                              acpi_thermal_notify, tz);
1632         if (ACPI_FAILURE(status)) {
1633                 result = -ENODEV;
1634                 goto remove_fs;
1635         }
1636
1637         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1638                acpi_device_name(device), acpi_device_bid(device),
1639                KELVIN_TO_CELSIUS(tz->temperature));
1640         goto end;
1641
1642 remove_fs:
1643         acpi_thermal_remove_fs(device);
1644 unregister_thermal_zone:
1645         thermal_zone_device_unregister(tz->thermal_zone);
1646 free_memory:
1647         kfree(tz);
1648 end:
1649         return result;
1650 }
1651
1652 static int acpi_thermal_remove(struct acpi_device *device, int type)
1653 {
1654         acpi_status status = AE_OK;
1655         struct acpi_thermal *tz = NULL;
1656
1657
1658         if (!device || !acpi_driver_data(device))
1659                 return -EINVAL;
1660
1661         tz = acpi_driver_data(device);
1662
1663         /* avoid timer adding new defer task */
1664         tz->zombie = 1;
1665         /* wait for running timer (on other CPUs) finish */
1666         del_timer_sync(&(tz->timer));
1667         /* synchronize deferred task */
1668         acpi_os_wait_events_complete(NULL);
1669         /* deferred task may reinsert timer */
1670         del_timer_sync(&(tz->timer));
1671
1672         status = acpi_remove_notify_handler(device->handle,
1673                                             ACPI_DEVICE_NOTIFY,
1674                                             acpi_thermal_notify);
1675
1676         /* Terminate policy */
1677         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1678                 tz->trips.passive.flags.enabled = 0;
1679                 acpi_thermal_passive(tz);
1680         }
1681         if (tz->trips.active[0].flags.valid
1682             && tz->trips.active[0].flags.enabled) {
1683                 tz->trips.active[0].flags.enabled = 0;
1684                 acpi_thermal_active(tz);
1685         }
1686
1687         acpi_thermal_remove_fs(device);
1688         acpi_thermal_unregister_thermal_zone(tz);
1689         mutex_destroy(&tz->lock);
1690         kfree(tz);
1691         return 0;
1692 }
1693
1694 static int acpi_thermal_resume(struct acpi_device *device)
1695 {
1696         struct acpi_thermal *tz = NULL;
1697         int i, j, power_state, result;
1698
1699
1700         if (!device || !acpi_driver_data(device))
1701                 return -EINVAL;
1702
1703         tz = acpi_driver_data(device);
1704
1705         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1706                 if (!(&tz->trips.active[i]))
1707                         break;
1708                 if (!tz->trips.active[i].flags.valid)
1709                         break;
1710                 tz->trips.active[i].flags.enabled = 1;
1711                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1712                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1713                             handles[j], &power_state);
1714                         if (result || (power_state != ACPI_STATE_D0)) {
1715                                 tz->trips.active[i].flags.enabled = 0;
1716                                 break;
1717                         }
1718                 }
1719                 tz->state.active |= tz->trips.active[i].flags.enabled;
1720         }
1721
1722         acpi_thermal_check(tz);
1723
1724         return AE_OK;
1725 }
1726
1727 static int thermal_act(const struct dmi_system_id *d) {
1728
1729         if (act == 0) {
1730                 printk(KERN_NOTICE "ACPI: %s detected: "
1731                         "disabling all active thermal trip points\n", d->ident);
1732                 act = -1;
1733         }
1734         return 0;
1735 }
1736 static int thermal_nocrt(const struct dmi_system_id *d) {
1737
1738         printk(KERN_NOTICE "ACPI: %s detected: "
1739                 "disabling all critical thermal trip point actions.\n", d->ident);
1740         nocrt = 1;
1741         return 0;
1742 }
1743 static int thermal_tzp(const struct dmi_system_id *d) {
1744
1745         if (tzp == 0) {
1746                 printk(KERN_NOTICE "ACPI: %s detected: "
1747                         "enabling thermal zone polling\n", d->ident);
1748                 tzp = 300;      /* 300 dS = 30 Seconds */
1749         }
1750         return 0;
1751 }
1752 static int thermal_psv(const struct dmi_system_id *d) {
1753
1754         if (psv == 0) {
1755                 printk(KERN_NOTICE "ACPI: %s detected: "
1756                         "disabling all passive thermal trip points\n", d->ident);
1757                 psv = -1;
1758         }
1759         return 0;
1760 }
1761
1762 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1763         /*
1764          * Award BIOS on this AOpen makes thermal control almost worthless.
1765          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1766          */
1767         {
1768          .callback = thermal_act,
1769          .ident = "AOpen i915GMm-HFS",
1770          .matches = {
1771                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1772                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1773                 },
1774         },
1775         {
1776          .callback = thermal_psv,
1777          .ident = "AOpen i915GMm-HFS",
1778          .matches = {
1779                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1780                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1781                 },
1782         },
1783         {
1784          .callback = thermal_tzp,
1785          .ident = "AOpen i915GMm-HFS",
1786          .matches = {
1787                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1788                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1789                 },
1790         },
1791         {
1792          .callback = thermal_nocrt,
1793          .ident = "Gigabyte GA-7ZX",
1794          .matches = {
1795                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1796                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1797                 },
1798         },
1799         {}
1800 };
1801
1802 static int __init acpi_thermal_init(void)
1803 {
1804         int result = 0;
1805
1806         dmi_check_system(thermal_dmi_table);
1807
1808         if (off) {
1809                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1810                 return -ENODEV;
1811         }
1812         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1813         if (!acpi_thermal_dir)
1814                 return -ENODEV;
1815         acpi_thermal_dir->owner = THIS_MODULE;
1816
1817         result = acpi_bus_register_driver(&acpi_thermal_driver);
1818         if (result < 0) {
1819                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1820                 return -ENODEV;
1821         }
1822
1823         return 0;
1824 }
1825
1826 static void __exit acpi_thermal_exit(void)
1827 {
1828
1829         acpi_bus_unregister_driver(&acpi_thermal_driver);
1830
1831         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1832
1833         return;
1834 }
1835
1836 module_init(acpi_thermal_init);
1837 module_exit(acpi_thermal_exit);