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   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/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 critical threshold
 392                                  */
 393                                 if (crt_k > tz->trips.critical.temperature)
 394                                         printk(KERN_WARNING PREFIX
 395                                                 "Critical threshold %d C\n", crt);
 396                                 tz->trips.critical.temperature = crt_k;
 397                         }
 398                 }
 399         }
 400
 401         /* Critical Sleep (optional) */
 402         if (flag & ACPI_TRIPS_HOT) {
 403                 status = acpi_evaluate_integer(tz->device->handle,
 404                                 "_HOT", NULL, &tz->trips.hot.temperature);
 405                 if (ACPI_FAILURE(status)) {
 406                         tz->trips.hot.flags.valid = 0;
 407                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 408                                         "No hot threshold\n"));
 409                 } else {
 410                         tz->trips.hot.flags.valid = 1;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                         "Found hot threshold [%lu]\n",
 413                                         tz->trips.critical.temperature));
 414                 }
 415         }
 416
 417         /* Passive (optional) */
 418         if (flag & ACPI_TRIPS_PASSIVE) {
 419                 valid = tz->trips.passive.flags.valid;
 420                 if (psv == -1) {
 421                         status = AE_SUPPORT;
 422                 } else if (psv > 0) {
 423                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 424                         status = AE_OK;
 425                 } else {
 426                         status = acpi_evaluate_integer(tz->device->handle,
 427                                 "_PSV", NULL, &tz->trips.passive.temperature);
 428                 }
 429
 430                 if (ACPI_FAILURE(status))
 431                         tz->trips.passive.flags.valid = 0;
 432                 else {
 433                         tz->trips.passive.flags.valid = 1;
 434                         if (flag == ACPI_TRIPS_INIT) {
 435                                 status = acpi_evaluate_integer(
 436                                                 tz->device->handle, "_TC1",
 437                                                 NULL, &tz->trips.passive.tc1);
 438                                 if (ACPI_FAILURE(status))
 439                                         tz->trips.passive.flags.valid = 0;
 440                                 status = acpi_evaluate_integer(
 441                                                 tz->device->handle, "_TC2",
 442                                                 NULL, &tz->trips.passive.tc2);
 443                                 if (ACPI_FAILURE(status))
 444                                         tz->trips.passive.flags.valid = 0;
 445                                 status = acpi_evaluate_integer(
 446                                                 tz->device->handle, "_TSP",
 447                                                 NULL, &tz->trips.passive.tsp);
 448                                 if (ACPI_FAILURE(status))
 449                                         tz->trips.passive.flags.valid = 0;
 450                         }
 451                 }
 452         }
 453         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 454                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 455                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 456                                                         NULL, &devices);
 457                 if (ACPI_FAILURE(status))
 458                         tz->trips.passive.flags.valid = 0;
 459                 else
 460                         tz->trips.passive.flags.valid = 1;
 461
 462                 if (memcmp(&tz->trips.passive.devices, &devices,
 463                                 sizeof(struct acpi_handle_list))) {
 464                         memcpy(&tz->trips.passive.devices, &devices,
 465                                 sizeof(struct acpi_handle_list));
 466                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 467                 }
 468         }
 469         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 470                 if (valid != tz->trips.passive.flags.valid)
 471                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 472         }
 473
 474         /* Active (optional) */
 475         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 476                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 477                 valid = tz->trips.active[i].flags.valid;
 478
 479                 if (act == -1)
 480                         break; /* disable all active trip points */
 481
 482                 if (flag & ACPI_TRIPS_ACTIVE) {
 483                         status = acpi_evaluate_integer(tz->device->handle,
 484                                 name, NULL, &tz->trips.active[i].temperature);
 485                         if (ACPI_FAILURE(status)) {
 486                                 tz->trips.active[i].flags.valid = 0;
 487                                 if (i == 0)
 488                                         break;
 489                                 if (act <= 0)
 490                                         break;
 491                                 if (i == 1)
 492                                         tz->trips.active[0].temperature =
 493                                                 CELSIUS_TO_KELVIN(act);
 494                                 else
 495                                         /*
 496                                          * Don't allow override higher than
 497                                          * the next higher trip point
 498                                          */
 499                                         tz->trips.active[i - 1].temperature =
 500                                                 (tz->trips.active[i - 2].temperature <
 501                                                 CELSIUS_TO_KELVIN(act) ?
 502                                                 tz->trips.active[i - 2].temperature :
 503                                                 CELSIUS_TO_KELVIN(act));
 504                                 break;
 505                         } else
 506                                 tz->trips.active[i].flags.valid = 1;
 507                 }
 508
 509                 name[2] = 'L';
 510                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 511                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 512                         status = acpi_evaluate_reference(tz->device->handle,
 513                                                 name, NULL, &devices);
 514                         if (ACPI_FAILURE(status))
 515                                 tz->trips.active[i].flags.valid = 0;
 516                         else
 517                                 tz->trips.active[i].flags.valid = 1;
 518
 519                         if (memcmp(&tz->trips.active[i].devices, &devices,
 520                                         sizeof(struct acpi_handle_list))) {
 521                                 memcpy(&tz->trips.active[i].devices, &devices,
 522                                         sizeof(struct acpi_handle_list));
 523                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 524                         }
 525                 }
 526                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 527                         if (valid != tz->trips.active[i].flags.valid)
 528                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 529
 530                 if (!tz->trips.active[i].flags.valid)
 531                         break;
 532         }
 533
 534         if (flag & ACPI_TRIPS_DEVICES) {
 535                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 536                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 537                                                 NULL, &devices);
 538                 if (memcmp(&tz->devices, &devices,
 539                                 sizeof(struct acpi_handle_list))) {
 540                         memcpy(&tz->devices, &devices,
 541                                 sizeof(struct acpi_handle_list));
 542                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 543                 }
 544         }
 545
 546         return 0;
 547 }
 548
 549 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 550 {
 551         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 552 }
 553
 554 static int acpi_thermal_critical(struct acpi_thermal *tz)
 555 {
 556         if (!tz || !tz->trips.critical.flags.valid)
 557                 return -EINVAL;
 558
 559         if (tz->temperature >= tz->trips.critical.temperature) {
 560                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 561                 tz->trips.critical.flags.enabled = 1;
 562         } else if (tz->trips.critical.flags.enabled)
 563                 tz->trips.critical.flags.enabled = 0;
 564
 565         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 566                                 tz->trips.critical.flags.enabled);
 567         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 568                                           tz->device->dev.bus_id,
 569                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 570                                           tz->trips.critical.flags.enabled);
 571
 572         /* take no action if nocrt is set */
 573         if(!nocrt) {
 574                 printk(KERN_EMERG
 575                         "Critical temperature reached (%ld C), shutting down.\n",
 576                         KELVIN_TO_CELSIUS(tz->temperature));
 577                 orderly_poweroff(true);
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int acpi_thermal_hot(struct acpi_thermal *tz)
 584 {
 585         if (!tz || !tz->trips.hot.flags.valid)
 586                 return -EINVAL;
 587
 588         if (tz->temperature >= tz->trips.hot.temperature) {
 589                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 590                 tz->trips.hot.flags.enabled = 1;
 591         } else if (tz->trips.hot.flags.enabled)
 592                 tz->trips.hot.flags.enabled = 0;
 593
 594         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 595                                 tz->trips.hot.flags.enabled);
 596         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 597                                           tz->device->dev.bus_id,
 598                                           ACPI_THERMAL_NOTIFY_HOT,
 599                                           tz->trips.hot.flags.enabled);
 600
 601         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 602
 603         return 0;
 604 }
 605
 606 static void acpi_thermal_passive(struct acpi_thermal *tz)
 607 {
 608         int result = 1;
 609         struct acpi_thermal_passive *passive = NULL;
 610         int trend = 0;
 611         int i = 0;
 612
 613
 614         if (!tz || !tz->trips.passive.flags.valid)
 615                 return;
 616
 617         passive = &(tz->trips.passive);
 618
 619         /*
 620          * Above Trip?
 621          * -----------
 622          * Calculate the thermal trend (using the passive cooling equation)
 623          * and modify the performance limit for all passive cooling devices
 624          * accordingly.  Note that we assume symmetry.
 625          */
 626         if (tz->temperature >= passive->temperature) {
 627                 trend =
 628                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 629                     (passive->tc2 * (tz->temperature - passive->temperature));
 630                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 631                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 632                                   trend, passive->tc1, tz->temperature,
 633                                   tz->last_temperature, passive->tc2,
 634                                   tz->temperature, passive->temperature));
 635                 passive->flags.enabled = 1;
 636                 /* Heating up? */
 637                 if (trend > 0)
 638                         for (i = 0; i < passive->devices.count; i++)
 639                                 acpi_processor_set_thermal_limit(passive->
 640                                                                  devices.
 641                                                                  handles[i],
 642                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 643                 /* Cooling off? */
 644                 else if (trend < 0) {
 645                         for (i = 0; i < passive->devices.count; i++)
 646                                 /*
 647                                  * assume that we are on highest
 648                                  * freq/lowest thrott and can leave
 649                                  * passive mode, even in error case
 650                                  */
 651                                 if (!acpi_processor_set_thermal_limit
 652                                     (passive->devices.handles[i],
 653                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 654                                         result = 0;
 655                         /*
 656                          * Leave cooling mode, even if the temp might
 657                          * higher than trip point This is because some
 658                          * machines might have long thermal polling
 659                          * frequencies (tsp) defined. We will fall back
 660                          * into passive mode in next cycle (probably quicker)
 661                          */
 662                         if (result) {
 663                                 passive->flags.enabled = 0;
 664                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 665                                                   "Disabling passive cooling, still above threshold,"
 666                                                   " but we are cooling down\n"));
 667                         }
 668                 }
 669                 return;
 670         }
 671
 672         /*
 673          * Below Trip?
 674          * -----------
 675          * Implement passive cooling hysteresis to slowly increase performance
 676          * and avoid thrashing around the passive trip point.  Note that we
 677          * assume symmetry.
 678          */
 679         if (!passive->flags.enabled)
 680                 return;
 681         for (i = 0; i < passive->devices.count; i++)
 682                 if (!acpi_processor_set_thermal_limit
 683                     (passive->devices.handles[i],
 684                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 685                         result = 0;
 686         if (result) {
 687                 passive->flags.enabled = 0;
 688                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 689                                   "Disabling passive cooling (zone is cool)\n"));
 690         }
 691 }
 692
 693 static void acpi_thermal_active(struct acpi_thermal *tz)
 694 {
 695         int result = 0;
 696         struct acpi_thermal_active *active = NULL;
 697         int i = 0;
 698         int j = 0;
 699         unsigned long maxtemp = 0;
 700
 701
 702         if (!tz)
 703                 return;
 704
 705         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 706                 active = &(tz->trips.active[i]);
 707                 if (!active || !active->flags.valid)
 708                         break;
 709                 if (tz->temperature >= active->temperature) {
 710                         /*
 711                          * Above Threshold?
 712                          * ----------------
 713                          * If not already enabled, turn ON all cooling devices
 714                          * associated with this active threshold.
 715                          */
 716                         if (active->temperature > maxtemp)
 717                                 tz->state.active_index = i;
 718                         maxtemp = active->temperature;
 719                         if (active->flags.enabled)
 720                                 continue;
 721                         for (j = 0; j < active->devices.count; j++) {
 722                                 result =
 723                                     acpi_bus_set_power(active->devices.
 724                                                        handles[j],
 725                                                        ACPI_STATE_D0);
 726                                 if (result) {
 727                                         printk(KERN_WARNING PREFIX
 728                                                       "Unable to turn cooling device [%p] 'on'\n",
 729                                                       active->devices.
 730                                                       handles[j]);
 731                                         continue;
 732                                 }
 733                                 active->flags.enabled = 1;
 734                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 735                                                   "Cooling device [%p] now 'on'\n",
 736                                                   active->devices.handles[j]));
 737                         }
 738                         continue;
 739                 }
 740                 if (!active->flags.enabled)
 741                         continue;
 742                 /*
 743                  * Below Threshold?
 744                  * ----------------
 745                  * Turn OFF all cooling devices associated with this
 746                  * threshold.
 747                  */
 748                 for (j = 0; j < active->devices.count; j++) {
 749                         result = acpi_bus_set_power(active->devices.handles[j],
 750                                                     ACPI_STATE_D3);
 751                         if (result) {
 752                                 printk(KERN_WARNING PREFIX
 753                                               "Unable to turn cooling device [%p] 'off'\n",
 754                                               active->devices.handles[j]);
 755                                 continue;
 756                         }
 757                         active->flags.enabled = 0;
 758                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 759                                           "Cooling device [%p] now 'off'\n",
 760                                           active->devices.handles[j]));
 761                 }
 762         }
 763 }
 764
 765 static void acpi_thermal_check(void *context);
 766
 767 static void acpi_thermal_run(unsigned long data)
 768 {
 769         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 770         if (!tz->zombie)
 771                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 772 }
 773
 774 static void acpi_thermal_active_off(void *data)
 775 {
 776         int result = 0;
 777         struct acpi_thermal *tz = data;
 778         int i = 0;
 779         int j = 0;
 780         struct acpi_thermal_active *active = NULL;
 781
 782         if (!tz) {
 783                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 784                 return;
 785         }
 786
 787         result = acpi_thermal_get_temperature(tz);
 788         if (result)
 789                 return;
 790
 791         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 792                 active = &(tz->trips.active[i]);
 793                 if (!active || !active->flags.valid)
 794                         break;
 795                 if (tz->temperature >= active->temperature) {
 796                         /*
 797                          * If the thermal temperature is greater than the
 798                          * active threshod, unnecessary to turn off the
 799                          * the active cooling device.
 800                          */
 801                         continue;
 802                 }
 803                 /*
 804                  * Below Threshold?
 805                  * ----------------
 806                  * Turn OFF all cooling devices associated with this
 807                  * threshold.
 808                  */
 809                 for (j = 0; j < active->devices.count; j++)
 810                         result = acpi_bus_set_power(active->devices.handles[j],
 811                                                     ACPI_STATE_D3);
 812         }
 813 }
 814
 815 static void acpi_thermal_check(void *data)
 816 {
 817         int result = 0;
 818         struct acpi_thermal *tz = data;
 819         unsigned long sleep_time = 0;
 820         unsigned long timeout_jiffies = 0;
 821         int i = 0;
 822         struct acpi_thermal_state state;
 823
 824
 825         if (!tz) {
 826                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 827                 return;
 828         }
 829
 830         /* Check if someone else is already running */
 831         if (!mutex_trylock(&tz->lock))
 832                 return;
 833
 834         state = tz->state;
 835
 836         result = acpi_thermal_get_temperature(tz);
 837         if (result)
 838                 goto unlock;
 839
 840         if (!tz->tz_enabled)
 841                 goto unlock;
 842
 843         memset(&tz->state, 0, sizeof(tz->state));
 844
 845         /*
 846          * Check Trip Points
 847          * -----------------
 848          * Compare the current temperature to the trip point values to see
 849          * if we've entered one of the thermal policy states.  Note that
 850          * this function determines when a state is entered, but the
 851          * individual policy decides when it is exited (e.g. hysteresis).
 852          */
 853         if (tz->trips.critical.flags.valid)
 854                 state.critical |=
 855                     (tz->temperature >= tz->trips.critical.temperature);
 856         if (tz->trips.hot.flags.valid)
 857                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 858         if (tz->trips.passive.flags.valid)
 859                 state.passive |=
 860                     (tz->temperature >= tz->trips.passive.temperature);
 861         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 862                 if (tz->trips.active[i].flags.valid)
 863                         state.active |=
 864                             (tz->temperature >=
 865                              tz->trips.active[i].temperature);
 866
 867         /*
 868          * Invoke Policy
 869          * -------------
 870          * Separated from the above check to allow individual policy to
 871          * determine when to exit a given state.
 872          */
 873         if (state.critical)
 874                 acpi_thermal_critical(tz);
 875         if (state.hot)
 876                 acpi_thermal_hot(tz);
 877         if (state.passive)
 878                 acpi_thermal_passive(tz);
 879         if (state.active)
 880                 acpi_thermal_active(tz);
 881
 882         /*
 883          * Calculate State
 884          * ---------------
 885          * Again, separated from the above two to allow independent policy
 886          * decisions.
 887          */
 888         tz->state.critical = tz->trips.critical.flags.enabled;
 889         tz->state.hot = tz->trips.hot.flags.enabled;
 890         tz->state.passive = tz->trips.passive.flags.enabled;
 891         tz->state.active = 0;
 892         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 893                 tz->state.active |= tz->trips.active[i].flags.enabled;
 894
 895         /*
 896          * Calculate Sleep Time
 897          * --------------------
 898          * If we're in the passive state, use _TSP's value.  Otherwise
 899          * use the default polling frequency (e.g. _TZP).  If no polling
 900          * frequency is specified then we'll wait forever (at least until
 901          * a thermal event occurs).  Note that _TSP and _TZD values are
 902          * given in 1/10th seconds (we must covert to milliseconds).
 903          */
 904         if (tz->state.passive) {
 905                 sleep_time = tz->trips.passive.tsp * 100;
 906                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 907         } else if (tz->polling_frequency > 0) {
 908                 sleep_time = tz->polling_frequency * 100;
 909                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 910         }
 911
 912         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 913                           tz->name, tz->temperature, sleep_time));
 914
 915         /*
 916          * Schedule Next Poll
 917          * ------------------
 918          */
 919         if (!sleep_time) {
 920                 if (timer_pending(&(tz->timer)))
 921                         del_timer(&(tz->timer));
 922         } else {
 923                 if (timer_pending(&(tz->timer)))
 924                         mod_timer(&(tz->timer), timeout_jiffies);
 925                 else {
 926                         tz->timer.data = (unsigned long)tz;
 927                         tz->timer.function = acpi_thermal_run;
 928                         tz->timer.expires = timeout_jiffies;
 929                         add_timer(&(tz->timer));
 930                 }
 931         }
 932       unlock:
 933         mutex_unlock(&tz->lock);
 934 }
 935
 936 /* sys I/F for generic thermal sysfs support */
 937 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 938
 939 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 940 {
 941         struct acpi_thermal *tz = thermal->devdata;
 942         int result;
 943
 944         if (!tz)
 945                 return -EINVAL;
 946
 947         result = acpi_thermal_get_temperature(tz);
 948         if (result)
 949                 return result;
 950
 951         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
 952 }
 953
 954 static const char enabled[] = "kernel";
 955 static const char disabled[] = "user";
 956 static int thermal_get_mode(struct thermal_zone_device *thermal,
 957                                 char *buf)
 958 {
 959         struct acpi_thermal *tz = thermal->devdata;
 960
 961         if (!tz)
 962                 return -EINVAL;
 963
 964         return sprintf(buf, "%s\n", tz->tz_enabled ?
 965                         enabled : disabled);
 966 }
 967
 968 static int thermal_set_mode(struct thermal_zone_device *thermal,
 969                                 const char *buf)
 970 {
 971         struct acpi_thermal *tz = thermal->devdata;
 972         int enable;
 973
 974         if (!tz)
 975                 return -EINVAL;
 976
 977         /*
 978          * enable/disable thermal management from ACPI thermal driver
 979          */
 980         if (!strncmp(buf, enabled, sizeof enabled - 1))
 981                 enable = 1;
 982         else if (!strncmp(buf, disabled, sizeof disabled - 1))
 983                 enable = 0;
 984         else
 985                 return -EINVAL;
 986
 987         if (enable != tz->tz_enabled) {
 988                 tz->tz_enabled = enable;
 989                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 990                         "%s ACPI thermal control\n",
 991                         tz->tz_enabled ? enabled : disabled));
 992                 acpi_thermal_check(tz);
 993         }
 994         return 0;
 995 }
 996
 997 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 998                                  int trip, char *buf)
 999 {
1000         struct acpi_thermal *tz = thermal->devdata;
1001         int i;
1002
1003         if (!tz || trip < 0)
1004                 return -EINVAL;
1005
1006         if (tz->trips.critical.flags.valid) {
1007                 if (!trip)
1008                         return sprintf(buf, "critical\n");
1009                 trip--;
1010         }
1011
1012         if (tz->trips.hot.flags.valid) {
1013                 if (!trip)
1014                         return sprintf(buf, "hot\n");
1015                 trip--;
1016         }
1017
1018         if (tz->trips.passive.flags.valid) {
1019                 if (!trip)
1020                         return sprintf(buf, "passive\n");
1021                 trip--;
1022         }
1023
1024         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1025                 tz->trips.active[i].flags.valid; i++) {
1026                 if (!trip)
1027                         return sprintf(buf, "active%d\n", i);
1028                 trip--;
1029         }
1030
1031         return -EINVAL;
1032 }
1033
1034 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1035                                  int trip, char *buf)
1036 {
1037         struct acpi_thermal *tz = thermal->devdata;
1038         int i;
1039
1040         if (!tz || trip < 0)
1041                 return -EINVAL;
1042
1043         if (tz->trips.critical.flags.valid) {
1044                 if (!trip)
1045                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1046                                 tz->trips.critical.temperature));
1047                 trip--;
1048         }
1049
1050         if (tz->trips.hot.flags.valid) {
1051                 if (!trip)
1052                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1053                                         tz->trips.hot.temperature));
1054                 trip--;
1055         }
1056
1057         if (tz->trips.passive.flags.valid) {
1058                 if (!trip)
1059                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1060                                         tz->trips.passive.temperature));
1061                 trip--;
1062         }
1063
1064         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1065                 tz->trips.active[i].flags.valid; i++) {
1066                 if (!trip)
1067                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1068                                         tz->trips.active[i].temperature));
1069                 trip--;
1070         }
1071
1072         return -EINVAL;
1073 }
1074
1075 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1076                                 unsigned long *temperature) {
1077         struct acpi_thermal *tz = thermal->devdata;
1078
1079         if (tz->trips.critical.flags.valid) {
1080                 *temperature = KELVIN_TO_MILLICELSIUS(
1081                                 tz->trips.critical.temperature);
1082                 return 0;
1083         } else
1084                 return -EINVAL;
1085 }
1086
1087 typedef int (*cb)(struct thermal_zone_device *, int,
1088                   struct thermal_cooling_device *);
1089 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1090                                         struct thermal_cooling_device *cdev,
1091                                         cb action)
1092 {
1093         struct acpi_device *device = cdev->devdata;
1094         struct acpi_thermal *tz = thermal->devdata;
1095         struct acpi_device *dev;
1096         acpi_status status;
1097         acpi_handle handle;
1098         int i;
1099         int j;
1100         int trip = -1;
1101         int result = 0;
1102
1103         if (tz->trips.critical.flags.valid)
1104                 trip++;
1105
1106         if (tz->trips.hot.flags.valid)
1107                 trip++;
1108
1109         if (tz->trips.passive.flags.valid) {
1110                 trip++;
1111                 for (i = 0; i < tz->trips.passive.devices.count;
1112                     i++) {
1113                         handle = tz->trips.passive.devices.handles[i];
1114                         status = acpi_bus_get_device(handle, &dev);
1115                         if (ACPI_SUCCESS(status) && (dev == device)) {
1116                                 result = action(thermal, trip, cdev);
1117                                 if (result)
1118                                         goto failed;
1119                         }
1120                 }
1121         }
1122
1123         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1124                 if (!tz->trips.active[i].flags.valid)
1125                         break;
1126                 trip++;
1127                 for (j = 0;
1128                     j < tz->trips.active[i].devices.count;
1129                     j++) {
1130                         handle = tz->trips.active[i].devices.handles[j];
1131                         status = acpi_bus_get_device(handle, &dev);
1132                         if (ACPI_SUCCESS(status) && (dev == device)) {
1133                                 result = action(thermal, trip, cdev);
1134                                 if (result)
1135                                         goto failed;
1136                         }
1137                 }
1138         }
1139
1140         for (i = 0; i < tz->devices.count; i++) {
1141                 handle = tz->devices.handles[i];
1142                 status = acpi_bus_get_device(handle, &dev);
1143                 if (ACPI_SUCCESS(status) && (dev == device)) {
1144                         result = action(thermal, -1, cdev);
1145                         if (result)
1146                                 goto failed;
1147                 }
1148         }
1149
1150 failed:
1151         return result;
1152 }
1153
1154 static int
1155 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1156                                         struct thermal_cooling_device *cdev)
1157 {
1158         return acpi_thermal_cooling_device_cb(thermal, cdev,
1159                                 thermal_zone_bind_cooling_device);
1160 }
1161
1162 static int
1163 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1164                                         struct thermal_cooling_device *cdev)
1165 {
1166         return acpi_thermal_cooling_device_cb(thermal, cdev,
1167                                 thermal_zone_unbind_cooling_device);
1168 }
1169
1170 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1171         .bind = acpi_thermal_bind_cooling_device,
1172         .unbind = acpi_thermal_unbind_cooling_device,
1173         .get_temp = thermal_get_temp,
1174         .get_mode = thermal_get_mode,
1175         .set_mode = thermal_set_mode,
1176         .get_trip_type = thermal_get_trip_type,
1177         .get_trip_temp = thermal_get_trip_temp,
1178         .get_crit_temp = thermal_get_crit_temp,
1179 };
1180
1181 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1182 {
1183         int trips = 0;
1184         int result;
1185         acpi_status status;
1186         int i;
1187
1188         if (tz->trips.critical.flags.valid)
1189                 trips++;
1190
1191         if (tz->trips.hot.flags.valid)
1192                 trips++;
1193
1194         if (tz->trips.passive.flags.valid)
1195                 trips++;
1196
1197         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1198                         tz->trips.active[i].flags.valid; i++, trips++);
1199         tz->thermal_zone = thermal_zone_device_register("acpitz",
1200                                         trips, tz, &acpi_thermal_zone_ops);
1201         if (IS_ERR(tz->thermal_zone))
1202                 return -ENODEV;
1203
1204         result = sysfs_create_link(&tz->device->dev.kobj,
1205                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1206         if (result)
1207                 return result;
1208
1209         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1210                                    &tz->device->dev.kobj, "device");
1211         if (result)
1212                 return result;
1213
1214         status = acpi_attach_data(tz->device->handle,
1215                                   acpi_bus_private_data_handler,
1216                                   tz->thermal_zone);
1217         if (ACPI_FAILURE(status)) {
1218                 printk(KERN_ERR PREFIX
1219                                 "Error attaching device data\n");
1220                 return -ENODEV;
1221         }
1222
1223         tz->tz_enabled = 1;
1224
1225         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1226                  tz->thermal_zone->id);
1227         return 0;
1228 }
1229
1230 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1231 {
1232         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1233         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1234         thermal_zone_device_unregister(tz->thermal_zone);
1235         tz->thermal_zone = NULL;
1236         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1237 }
1238
1239
1240 /* --------------------------------------------------------------------------
1241                               FS Interface (/proc)
1242    -------------------------------------------------------------------------- */
1243
1244 static struct proc_dir_entry *acpi_thermal_dir;
1245
1246 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1247 {
1248         struct acpi_thermal *tz = seq->private;
1249
1250
1251         if (!tz)
1252                 goto end;
1253
1254         seq_puts(seq, "state:                   ");
1255
1256         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1257             && !tz->state.active)
1258                 seq_puts(seq, "ok\n");
1259         else {
1260                 if (tz->state.critical)
1261                         seq_puts(seq, "critical ");
1262                 if (tz->state.hot)
1263                         seq_puts(seq, "hot ");
1264                 if (tz->state.passive)
1265                         seq_puts(seq, "passive ");
1266                 if (tz->state.active)
1267                         seq_printf(seq, "active[%d]", tz->state.active_index);
1268                 seq_puts(seq, "\n");
1269         }
1270
1271       end:
1272         return 0;
1273 }
1274
1275 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1276 {
1277         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1278 }
1279
1280 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1281 {
1282         int result = 0;
1283         struct acpi_thermal *tz = seq->private;
1284
1285
1286         if (!tz)
1287                 goto end;
1288
1289         result = acpi_thermal_get_temperature(tz);
1290         if (result)
1291                 goto end;
1292
1293         seq_printf(seq, "temperature:             %ld C\n",
1294                    KELVIN_TO_CELSIUS(tz->temperature));
1295
1296       end:
1297         return 0;
1298 }
1299
1300 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1301 {
1302         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1303 }
1304
1305 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1306 {
1307         struct acpi_thermal *tz = seq->private;
1308         struct acpi_device *device;
1309         acpi_status status;
1310
1311         int i = 0;
1312         int j = 0;
1313
1314
1315         if (!tz)
1316                 goto end;
1317
1318         if (tz->trips.critical.flags.valid)
1319                 seq_printf(seq, "critical (S5):           %ld C%s",
1320                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1321                            nocrt ? " <disabled>\n" : "\n");
1322
1323         if (tz->trips.hot.flags.valid)
1324                 seq_printf(seq, "hot (S4):                %ld C%s",
1325                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1326                            nocrt ? " <disabled>\n" : "\n");
1327
1328         if (tz->trips.passive.flags.valid) {
1329                 seq_printf(seq,
1330                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1331                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1332                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1333                            tz->trips.passive.tsp);
1334                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1335                         status = acpi_bus_get_device(tz->trips.passive.devices.
1336                                                      handles[j], &device);
1337                         seq_printf(seq, "%4.4s ", status ? "" :
1338                                    acpi_device_bid(device));
1339                 }
1340                 seq_puts(seq, "\n");
1341         }
1342
1343         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1344                 if (!(tz->trips.active[i].flags.valid))
1345                         break;
1346                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1347                            i,
1348                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1349                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1350                         status = acpi_bus_get_device(tz->trips.active[i].
1351                                                      devices.handles[j],
1352                                                      &device);
1353                         seq_printf(seq, "%4.4s ", status ? "" :
1354                                    acpi_device_bid(device));
1355                 }
1356                 seq_puts(seq, "\n");
1357         }
1358
1359       end:
1360         return 0;
1361 }
1362
1363 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1364 {
1365         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1366 }
1367
1368 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1369 {
1370         struct acpi_thermal *tz = seq->private;
1371
1372
1373         if (!tz)
1374                 goto end;
1375
1376         if (!tz->flags.cooling_mode)
1377                 seq_puts(seq, "<setting not supported>\n");
1378         else
1379                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1380
1381       end:
1382         return 0;
1383 }
1384
1385 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1386 {
1387         return single_open(file, acpi_thermal_cooling_seq_show,
1388                            PDE(inode)->data);
1389 }
1390
1391 static ssize_t
1392 acpi_thermal_write_cooling_mode(struct file *file,
1393                                 const char __user * buffer,
1394                                 size_t count, loff_t * ppos)
1395 {
1396         struct seq_file *m = file->private_data;
1397         struct acpi_thermal *tz = m->private;
1398         int result = 0;
1399         char mode_string[12] = { '\0' };
1400
1401
1402         if (!tz || (count > sizeof(mode_string) - 1))
1403                 return -EINVAL;
1404
1405         if (!tz->flags.cooling_mode)
1406                 return -ENODEV;
1407
1408         if (copy_from_user(mode_string, buffer, count))
1409                 return -EFAULT;
1410
1411         mode_string[count] = '\0';
1412
1413         result = acpi_thermal_set_cooling_mode(tz,
1414                                                simple_strtoul(mode_string, NULL,
1415                                                               0));
1416         if (result)
1417                 return result;
1418
1419         acpi_thermal_check(tz);
1420
1421         return count;
1422 }
1423
1424 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1425 {
1426         struct acpi_thermal *tz = seq->private;
1427
1428
1429         if (!tz)
1430                 goto end;
1431
1432         if (!tz->polling_frequency) {
1433                 seq_puts(seq, "<polling disabled>\n");
1434                 goto end;
1435         }
1436
1437         seq_printf(seq, "polling frequency:       %lu seconds\n",
1438                    (tz->polling_frequency / 10));
1439
1440       end:
1441         return 0;
1442 }
1443
1444 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1445 {
1446         return single_open(file, acpi_thermal_polling_seq_show,
1447                            PDE(inode)->data);
1448 }
1449
1450 static ssize_t
1451 acpi_thermal_write_polling(struct file *file,
1452                            const char __user * buffer,
1453                            size_t count, loff_t * ppos)
1454 {
1455         struct seq_file *m = file->private_data;
1456         struct acpi_thermal *tz = m->private;
1457         int result = 0;
1458         char polling_string[12] = { '\0' };
1459         int seconds = 0;
1460
1461
1462         if (!tz || (count > sizeof(polling_string) - 1))
1463                 return -EINVAL;
1464
1465         if (copy_from_user(polling_string, buffer, count))
1466                 return -EFAULT;
1467
1468         polling_string[count] = '\0';
1469
1470         seconds = simple_strtoul(polling_string, NULL, 0);
1471
1472         result = acpi_thermal_set_polling(tz, seconds);
1473         if (result)
1474                 return result;
1475
1476         acpi_thermal_check(tz);
1477
1478         return count;
1479 }
1480
1481 static int acpi_thermal_add_fs(struct acpi_device *device)
1482 {
1483         struct proc_dir_entry *entry = NULL;
1484
1485
1486         if (!acpi_device_dir(device)) {
1487                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1488                                                      acpi_thermal_dir);
1489                 if (!acpi_device_dir(device))
1490                         return -ENODEV;
1491                 acpi_device_dir(device)->owner = THIS_MODULE;
1492         }
1493
1494         /* 'state' [R] */
1495         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1496                                  S_IRUGO, acpi_device_dir(device),
1497                                  &acpi_thermal_state_fops,
1498                                  acpi_driver_data(device));
1499         if (!entry)
1500                 return -ENODEV;
1501
1502         /* 'temperature' [R] */
1503         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1504                                  S_IRUGO, acpi_device_dir(device),
1505                                  &acpi_thermal_temp_fops,
1506                                  acpi_driver_data(device));
1507         if (!entry)
1508                 return -ENODEV;
1509
1510         /* 'trip_points' [R] */
1511         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1512                                  S_IRUGO,
1513                                  acpi_device_dir(device),
1514                                  &acpi_thermal_trip_fops,
1515                                  acpi_driver_data(device));
1516         if (!entry)
1517                 return -ENODEV;
1518
1519         /* 'cooling_mode' [R/W] */
1520         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1521                                  S_IFREG | S_IRUGO | S_IWUSR,
1522                                  acpi_device_dir(device),
1523                                  &acpi_thermal_cooling_fops,
1524                                  acpi_driver_data(device));
1525         if (!entry)
1526                 return -ENODEV;
1527
1528         /* 'polling_frequency' [R/W] */
1529         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1530                                  S_IFREG | S_IRUGO | S_IWUSR,
1531                                  acpi_device_dir(device),
1532                                  &acpi_thermal_polling_fops,
1533                                  acpi_driver_data(device));
1534         if (!entry)
1535                 return -ENODEV;
1536         return 0;
1537 }
1538
1539 static int acpi_thermal_remove_fs(struct acpi_device *device)
1540 {
1541
1542         if (acpi_device_dir(device)) {
1543                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1544                                   acpi_device_dir(device));
1545                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1546                                   acpi_device_dir(device));
1547                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1548                                   acpi_device_dir(device));
1549                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1550                                   acpi_device_dir(device));
1551                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1552                                   acpi_device_dir(device));
1553                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1554                 acpi_device_dir(device) = NULL;
1555         }
1556
1557         return 0;
1558 }
1559
1560 /* --------------------------------------------------------------------------
1561                                  Driver Interface
1562    -------------------------------------------------------------------------- */
1563
1564 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1565 {
1566         struct acpi_thermal *tz = data;
1567         struct acpi_device *device = NULL;
1568
1569
1570         if (!tz)
1571                 return;
1572
1573         device = tz->device;
1574
1575         switch (event) {
1576         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1577                 acpi_thermal_check(tz);
1578                 break;
1579         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1580                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1581                 acpi_thermal_check(tz);
1582                 acpi_bus_generate_proc_event(device, event, 0);
1583                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1584                                                   device->dev.bus_id, event, 0);
1585                 break;
1586         case ACPI_THERMAL_NOTIFY_DEVICES:
1587                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1588                 acpi_thermal_check(tz);
1589                 acpi_bus_generate_proc_event(device, event, 0);
1590                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1591                                                   device->dev.bus_id, event, 0);
1592                 break;
1593         default:
1594                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1595                                   "Unsupported event [0x%x]\n", event));
1596                 break;
1597         }
1598
1599         return;
1600 }
1601
1602 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1603 {
1604         int result = 0;
1605
1606
1607         if (!tz)
1608                 return -EINVAL;
1609
1610         /* Get temperature [_TMP] (required) */
1611         result = acpi_thermal_get_temperature(tz);
1612         if (result)
1613                 return result;
1614
1615         /* Get trip points [_CRT, _PSV, etc.] (required) */
1616         result = acpi_thermal_get_trip_points(tz);
1617         if (result)
1618                 return result;
1619
1620         /* Set the cooling mode [_SCP] to active cooling (default) */
1621         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1622         if (!result)
1623                 tz->flags.cooling_mode = 1;
1624
1625         /* Get default polling frequency [_TZP] (optional) */
1626         if (tzp)
1627                 tz->polling_frequency = tzp;
1628         else
1629                 acpi_thermal_get_polling_frequency(tz);
1630
1631         return 0;
1632 }
1633
1634 static int acpi_thermal_add(struct acpi_device *device)
1635 {
1636         int result = 0;
1637         acpi_status status = AE_OK;
1638         struct acpi_thermal *tz = NULL;
1639
1640
1641         if (!device)
1642                 return -EINVAL;
1643
1644         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1645         if (!tz)
1646                 return -ENOMEM;
1647
1648         tz->device = device;
1649         strcpy(tz->name, device->pnp.bus_id);
1650         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1651         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1652         device->driver_data = tz;
1653         mutex_init(&tz->lock);
1654
1655
1656         result = acpi_thermal_get_info(tz);
1657         if (result)
1658                 goto free_memory;
1659
1660         result = acpi_thermal_register_thermal_zone(tz);
1661         if (result)
1662                 goto free_memory;
1663
1664         result = acpi_thermal_add_fs(device);
1665         if (result)
1666                 goto unregister_thermal_zone;
1667
1668         init_timer(&tz->timer);
1669
1670         acpi_thermal_active_off(tz);
1671
1672         acpi_thermal_check(tz);
1673
1674         status = acpi_install_notify_handler(device->handle,
1675                                              ACPI_DEVICE_NOTIFY,
1676                                              acpi_thermal_notify, tz);
1677         if (ACPI_FAILURE(status)) {
1678                 result = -ENODEV;
1679                 goto remove_fs;
1680         }
1681
1682         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1683                acpi_device_name(device), acpi_device_bid(device),
1684                KELVIN_TO_CELSIUS(tz->temperature));
1685         goto end;
1686
1687 remove_fs:
1688         acpi_thermal_remove_fs(device);
1689 unregister_thermal_zone:
1690         thermal_zone_device_unregister(tz->thermal_zone);
1691 free_memory:
1692         kfree(tz);
1693 end:
1694         return result;
1695 }
1696
1697 static int acpi_thermal_remove(struct acpi_device *device, int type)
1698 {
1699         acpi_status status = AE_OK;
1700         struct acpi_thermal *tz = NULL;
1701
1702
1703         if (!device || !acpi_driver_data(device))
1704                 return -EINVAL;
1705
1706         tz = acpi_driver_data(device);
1707
1708         /* avoid timer adding new defer task */
1709         tz->zombie = 1;
1710         /* wait for running timer (on other CPUs) finish */
1711         del_timer_sync(&(tz->timer));
1712         /* synchronize deferred task */
1713         acpi_os_wait_events_complete(NULL);
1714         /* deferred task may reinsert timer */
1715         del_timer_sync(&(tz->timer));
1716
1717         status = acpi_remove_notify_handler(device->handle,
1718                                             ACPI_DEVICE_NOTIFY,
1719                                             acpi_thermal_notify);
1720
1721         /* Terminate policy */
1722         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1723                 tz->trips.passive.flags.enabled = 0;
1724                 acpi_thermal_passive(tz);
1725         }
1726         if (tz->trips.active[0].flags.valid
1727             && tz->trips.active[0].flags.enabled) {
1728                 tz->trips.active[0].flags.enabled = 0;
1729                 acpi_thermal_active(tz);
1730         }
1731
1732         acpi_thermal_remove_fs(device);
1733         acpi_thermal_unregister_thermal_zone(tz);
1734         mutex_destroy(&tz->lock);
1735         kfree(tz);
1736         return 0;
1737 }
1738
1739 static int acpi_thermal_resume(struct acpi_device *device)
1740 {
1741         struct acpi_thermal *tz = NULL;
1742         int i, j, power_state, result;
1743
1744
1745         if (!device || !acpi_driver_data(device))
1746                 return -EINVAL;
1747
1748         tz = acpi_driver_data(device);
1749
1750         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1751                 if (!(&tz->trips.active[i]))
1752                         break;
1753                 if (!tz->trips.active[i].flags.valid)
1754                         break;
1755                 tz->trips.active[i].flags.enabled = 1;
1756                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1757                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1758                             handles[j], &power_state);
1759                         if (result || (power_state != ACPI_STATE_D0)) {
1760                                 tz->trips.active[i].flags.enabled = 0;
1761                                 break;
1762                         }
1763                 }
1764                 tz->state.active |= tz->trips.active[i].flags.enabled;
1765         }
1766
1767         acpi_thermal_check(tz);
1768
1769         return AE_OK;
1770 }
1771
1772 static int thermal_act(const struct dmi_system_id *d) {
1773
1774         if (act == 0) {
1775                 printk(KERN_NOTICE "ACPI: %s detected: "
1776                         "disabling all active thermal trip points\n", d->ident);
1777                 act = -1;
1778         }
1779         return 0;
1780 }
1781 static int thermal_nocrt(const struct dmi_system_id *d) {
1782
1783         printk(KERN_NOTICE "ACPI: %s detected: "
1784                 "disabling all critical thermal trip point actions.\n", d->ident);
1785         nocrt = 1;
1786         return 0;
1787 }
1788 static int thermal_tzp(const struct dmi_system_id *d) {
1789
1790         if (tzp == 0) {
1791                 printk(KERN_NOTICE "ACPI: %s detected: "
1792                         "enabling thermal zone polling\n", d->ident);
1793                 tzp = 300;      /* 300 dS = 30 Seconds */
1794         }
1795         return 0;
1796 }
1797 static int thermal_psv(const struct dmi_system_id *d) {
1798
1799         if (psv == 0) {
1800                 printk(KERN_NOTICE "ACPI: %s detected: "
1801                         "disabling all passive thermal trip points\n", d->ident);
1802                 psv = -1;
1803         }
1804         return 0;
1805 }
1806
1807 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1808         /*
1809          * Award BIOS on this AOpen makes thermal control almost worthless.
1810          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1811          */
1812         {
1813          .callback = thermal_act,
1814          .ident = "AOpen i915GMm-HFS",
1815          .matches = {
1816                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1817                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1818                 },
1819         },
1820         {
1821          .callback = thermal_psv,
1822          .ident = "AOpen i915GMm-HFS",
1823          .matches = {
1824                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1825                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1826                 },
1827         },
1828         {
1829          .callback = thermal_tzp,
1830          .ident = "AOpen i915GMm-HFS",
1831          .matches = {
1832                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1833                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1834                 },
1835         },
1836         {
1837          .callback = thermal_nocrt,
1838          .ident = "Gigabyte GA-7ZX",
1839          .matches = {
1840                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1841                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1842                 },
1843         },
1844         {}
1845 };
1846
1847 static int __init acpi_thermal_init(void)
1848 {
1849         int result = 0;
1850
1851         dmi_check_system(thermal_dmi_table);
1852
1853         if (off) {
1854                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1855                 return -ENODEV;
1856         }
1857         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1858         if (!acpi_thermal_dir)
1859                 return -ENODEV;
1860         acpi_thermal_dir->owner = THIS_MODULE;
1861
1862         result = acpi_bus_register_driver(&acpi_thermal_driver);
1863         if (result < 0) {
1864                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1865                 return -ENODEV;
1866         }
1867
1868         return 0;
1869 }
1870
1871 static void __exit acpi_thermal_exit(void)
1872 {
1873
1874         acpi_bus_unregister_driver(&acpi_thermal_driver);
1875
1876         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1877
1878         return;
1879 }
1880
1881 module_init(acpi_thermal_init);
1882 module_exit(acpi_thermal_exit);