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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_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  68 ACPI_MODULE_NAME("thermal");
  69
  70 MODULE_AUTHOR("Paul Diefenbaugh");
  71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int act;
  75 module_param(act, int, 0644);
  76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  77
  78 static int crt;
  79 module_param(crt, int, 0644);
  80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  81
  82 static int tzp;
  83 module_param(tzp, int, 0444);
  84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  85
  86 static int nocrt;
  87 module_param(nocrt, int, 0);
  88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  89
  90 static int off;
  91 module_param(off, int, 0);
  92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  93
  94 static int psv;
  95 module_param(psv, int, 0644);
  96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  97
  98 static int acpi_thermal_add(struct acpi_device *device);
  99 static int acpi_thermal_remove(struct acpi_device *device, int type);
 100 static int acpi_thermal_resume(struct acpi_device *device);
 101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 106                                                const char __user *, size_t,
 107                                                loff_t *);
 108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 110                                           size_t, loff_t *);
 111
 112 static const struct acpi_device_id  thermal_device_ids[] = {
 113         {ACPI_THERMAL_HID, 0},
 114         {"", 0},
 115 };
 116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 117
 118 static struct acpi_driver acpi_thermal_driver = {
 119         .name = "thermal",
 120         .class = ACPI_THERMAL_CLASS,
 121         .ids = thermal_device_ids,
 122         .ops = {
 123                 .add = acpi_thermal_add,
 124                 .remove = acpi_thermal_remove,
 125                 .resume = acpi_thermal_resume,
 126                 },
 127 };
 128
 129 struct acpi_thermal_state {
 130         u8 critical:1;
 131         u8 hot:1;
 132         u8 passive:1;
 133         u8 active:1;
 134         u8 reserved:4;
 135         int active_index;
 136 };
 137
 138 struct acpi_thermal_state_flags {
 139         u8 valid:1;
 140         u8 enabled:1;
 141         u8 reserved:6;
 142 };
 143
 144 struct acpi_thermal_critical {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147 };
 148
 149 struct acpi_thermal_hot {
 150         struct acpi_thermal_state_flags flags;
 151         unsigned long temperature;
 152 };
 153
 154 struct acpi_thermal_passive {
 155         struct acpi_thermal_state_flags flags;
 156         unsigned long temperature;
 157         unsigned long tc1;
 158         unsigned long tc2;
 159         unsigned long tsp;
 160         struct acpi_handle_list devices;
 161 };
 162
 163 struct acpi_thermal_active {
 164         struct acpi_thermal_state_flags flags;
 165         unsigned long temperature;
 166         struct acpi_handle_list devices;
 167 };
 168
 169 struct acpi_thermal_trips {
 170         struct acpi_thermal_critical critical;
 171         struct acpi_thermal_hot hot;
 172         struct acpi_thermal_passive passive;
 173         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 174 };
 175
 176 struct acpi_thermal_flags {
 177         u8 cooling_mode:1;      /* _SCP */
 178         u8 devices:1;           /* _TZD */
 179         u8 reserved:6;
 180 };
 181
 182 struct acpi_thermal {
 183         struct acpi_device * device;
 184         acpi_bus_id name;
 185         unsigned long temperature;
 186         unsigned long last_temperature;
 187         unsigned long polling_frequency;
 188         volatile u8 zombie;
 189         struct acpi_thermal_flags flags;
 190         struct acpi_thermal_state state;
 191         struct acpi_thermal_trips trips;
 192         struct acpi_handle_list devices;
 193         struct timer_list timer;
 194         struct thermal_zone_device *thermal_zone;
 195         int tz_enabled;
 196         struct mutex lock;
 197 };
 198
 199 static const struct file_operations acpi_thermal_state_fops = {
 200         .owner = THIS_MODULE,
 201         .open = acpi_thermal_state_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static const struct file_operations acpi_thermal_temp_fops = {
 208         .owner = THIS_MODULE,
 209         .open = acpi_thermal_temp_open_fs,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 static const struct file_operations acpi_thermal_trip_fops = {
 216         .owner = THIS_MODULE,
 217         .open = acpi_thermal_trip_open_fs,
 218         .read = seq_read,
 219         .llseek = seq_lseek,
 220         .release = single_release,
 221 };
 222
 223 static const struct file_operations acpi_thermal_cooling_fops = {
 224         .owner = THIS_MODULE,
 225         .open = acpi_thermal_cooling_open_fs,
 226         .read = seq_read,
 227         .write = acpi_thermal_write_cooling_mode,
 228         .llseek = seq_lseek,
 229         .release = single_release,
 230 };
 231
 232 static const struct file_operations acpi_thermal_polling_fops = {
 233         .owner = THIS_MODULE,
 234         .open = acpi_thermal_polling_open_fs,
 235         .read = seq_read,
 236         .write = acpi_thermal_write_polling,
 237         .llseek = seq_lseek,
 238         .release = single_release,
 239 };
 240
 241 /* --------------------------------------------------------------------------
 242                              Thermal Zone Management
 243    -------------------------------------------------------------------------- */
 244
 245 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 246 {
 247         acpi_status status = AE_OK;
 248         unsigned long long tmp;
 249
 250         if (!tz)
 251                 return -EINVAL;
 252
 253         tz->last_temperature = tz->temperature;
 254
 255         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 256         if (ACPI_FAILURE(status))
 257                 return -ENODEV;
 258
 259         tz->temperature = tmp;
 260         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 261                           tz->temperature));
 262
 263         return 0;
 264 }
 265
 266 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 267 {
 268         acpi_status status = AE_OK;
 269         unsigned long long tmp;
 270
 271         if (!tz)
 272                 return -EINVAL;
 273
 274         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 275         if (ACPI_FAILURE(status))
 276                 return -ENODEV;
 277
 278         tz->polling_frequency = tmp;
 279         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 280                           tz->polling_frequency));
 281
 282         return 0;
 283 }
 284
 285 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 286 {
 287
 288         if (!tz)
 289                 return -EINVAL;
 290
 291         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 292
 293         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 294                           "Polling frequency set to %lu seconds\n",
 295                           tz->polling_frequency/10));
 296
 297         return 0;
 298 }
 299
 300 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 301 {
 302         acpi_status status = AE_OK;
 303         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 304         struct acpi_object_list arg_list = { 1, &arg0 };
 305         acpi_handle handle = NULL;
 306
 307
 308         if (!tz)
 309                 return -EINVAL;
 310
 311         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 312         if (ACPI_FAILURE(status)) {
 313                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 314                 return -ENODEV;
 315         }
 316
 317         arg0.integer.value = mode;
 318
 319         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 320         if (ACPI_FAILURE(status))
 321                 return -ENODEV;
 322
 323         return 0;
 324 }
 325
 326 #define ACPI_TRIPS_CRITICAL     0x01
 327 #define ACPI_TRIPS_HOT          0x02
 328 #define ACPI_TRIPS_PASSIVE      0x04
 329 #define ACPI_TRIPS_ACTIVE       0x08
 330 #define ACPI_TRIPS_DEVICES      0x10
 331
 332 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 333 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 334
 335 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 336                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 337                               ACPI_TRIPS_DEVICES)
 338
 339 /*
 340  * This exception is thrown out in two cases:
 341  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 342  *   when re-evaluating the AML code.
 343  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 344  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 345  */
 346 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 347 do {    \
 348         if (flags != ACPI_TRIPS_INIT)   \
 349                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 350                 "ACPI thermal trip point %s changed\n"  \
 351                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 352 } while (0)
 353
 354 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 355 {
 356         acpi_status status = AE_OK;
 357         unsigned long long tmp;
 358         struct acpi_handle_list devices;
 359         int valid = 0;
 360         int i;
 361
 362         /* Critical Shutdown (required) */
 363         if (flag & ACPI_TRIPS_CRITICAL) {
 364                 status = acpi_evaluate_integer(tz->device->handle,
 365                                 "_CRT", NULL, &tmp);
 366                 tz->trips.critical.temperature = tmp;
 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, &tmp);
 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.temperature = tmp;
 411                         tz->trips.hot.flags.valid = 1;
 412                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 413                                         "Found hot threshold [%lu]\n",
 414                                         tz->trips.critical.temperature));
 415                 }
 416         }
 417
 418         /* Passive (optional) */
 419         if (flag & ACPI_TRIPS_PASSIVE) {
 420                 valid = tz->trips.passive.flags.valid;
 421                 if (psv == -1) {
 422                         status = AE_SUPPORT;
 423                 } else if (psv > 0) {
 424                         tmp = CELSIUS_TO_KELVIN(psv);
 425                         status = AE_OK;
 426                 } else {
 427                         status = acpi_evaluate_integer(tz->device->handle,
 428                                 "_PSV", NULL, &tmp);
 429                 }
 430
 431                 if (ACPI_FAILURE(status))
 432                         tz->trips.passive.flags.valid = 0;
 433                 else {
 434                         tz->trips.passive.temperature = tmp;
 435                         tz->trips.passive.flags.valid = 1;
 436                         if (flag == ACPI_TRIPS_INIT) {
 437                                 status = acpi_evaluate_integer(
 438                                                 tz->device->handle, "_TC1",
 439                                                 NULL, &tmp);
 440                                 if (ACPI_FAILURE(status))
 441                                         tz->trips.passive.flags.valid = 0;
 442                                 else
 443                                         tz->trips.passive.tc1 = tmp;
 444                                 status = acpi_evaluate_integer(
 445                                                 tz->device->handle, "_TC2",
 446                                                 NULL, &tmp);
 447                                 if (ACPI_FAILURE(status))
 448                                         tz->trips.passive.flags.valid = 0;
 449                                 else
 450                                         tz->trips.passive.tc2 = tmp;
 451                                 status = acpi_evaluate_integer(
 452                                                 tz->device->handle, "_TSP",
 453                                                 NULL, &tmp);
 454                                 if (ACPI_FAILURE(status))
 455                                         tz->trips.passive.flags.valid = 0;
 456                                 else
 457                                         tz->trips.passive.tsp = tmp;
 458                         }
 459                 }
 460         }
 461         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 462                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 463                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 464                                                         NULL, &devices);
 465                 if (ACPI_FAILURE(status))
 466                         tz->trips.passive.flags.valid = 0;
 467                 else
 468                         tz->trips.passive.flags.valid = 1;
 469
 470                 if (memcmp(&tz->trips.passive.devices, &devices,
 471                                 sizeof(struct acpi_handle_list))) {
 472                         memcpy(&tz->trips.passive.devices, &devices,
 473                                 sizeof(struct acpi_handle_list));
 474                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 475                 }
 476         }
 477         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 478                 if (valid != tz->trips.passive.flags.valid)
 479                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 480         }
 481
 482         /* Active (optional) */
 483         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 484                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 485                 valid = tz->trips.active[i].flags.valid;
 486
 487                 if (act == -1)
 488                         break; /* disable all active trip points */
 489
 490                 if (flag & ACPI_TRIPS_ACTIVE) {
 491                         status = acpi_evaluate_integer(tz->device->handle,
 492                                                         name, NULL, &tmp);
 493                         if (ACPI_FAILURE(status)) {
 494                                 tz->trips.active[i].flags.valid = 0;
 495                                 if (i == 0)
 496                                         break;
 497                                 if (act <= 0)
 498                                         break;
 499                                 if (i == 1)
 500                                         tz->trips.active[0].temperature =
 501                                                 CELSIUS_TO_KELVIN(act);
 502                                 else
 503                                         /*
 504                                          * Don't allow override higher than
 505                                          * the next higher trip point
 506                                          */
 507                                         tz->trips.active[i - 1].temperature =
 508                                                 (tz->trips.active[i - 2].temperature <
 509                                                 CELSIUS_TO_KELVIN(act) ?
 510                                                 tz->trips.active[i - 2].temperature :
 511                                                 CELSIUS_TO_KELVIN(act));
 512                                 break;
 513                         } else {
 514                                 tz->trips.active[i].temperature = tmp;
 515                                 tz->trips.active[i].flags.valid = 1;
 516                         }
 517                 }
 518
 519                 name[2] = 'L';
 520                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 521                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 522                         status = acpi_evaluate_reference(tz->device->handle,
 523                                                 name, NULL, &devices);
 524                         if (ACPI_FAILURE(status))
 525                                 tz->trips.active[i].flags.valid = 0;
 526                         else
 527                                 tz->trips.active[i].flags.valid = 1;
 528
 529                         if (memcmp(&tz->trips.active[i].devices, &devices,
 530                                         sizeof(struct acpi_handle_list))) {
 531                                 memcpy(&tz->trips.active[i].devices, &devices,
 532                                         sizeof(struct acpi_handle_list));
 533                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 534                         }
 535                 }
 536                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 537                         if (valid != tz->trips.active[i].flags.valid)
 538                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 539
 540                 if (!tz->trips.active[i].flags.valid)
 541                         break;
 542         }
 543
 544         if (flag & ACPI_TRIPS_DEVICES) {
 545                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 546                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 547                                                 NULL, &devices);
 548                 if (memcmp(&tz->devices, &devices,
 549                                 sizeof(struct acpi_handle_list))) {
 550                         memcpy(&tz->devices, &devices,
 551                                 sizeof(struct acpi_handle_list));
 552                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 553                 }
 554         }
 555
 556         return 0;
 557 }
 558
 559 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 560 {
 561         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 562 }
 563
 564 static int acpi_thermal_critical(struct acpi_thermal *tz)
 565 {
 566         if (!tz || !tz->trips.critical.flags.valid)
 567                 return -EINVAL;
 568
 569         if (tz->temperature >= tz->trips.critical.temperature) {
 570                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 571                 tz->trips.critical.flags.enabled = 1;
 572         } else if (tz->trips.critical.flags.enabled)
 573                 tz->trips.critical.flags.enabled = 0;
 574
 575         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 576                                 tz->trips.critical.flags.enabled);
 577         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 578                                           dev_name(&tz->device->dev),
 579                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 580                                           tz->trips.critical.flags.enabled);
 581
 582         /* take no action if nocrt is set */
 583         if(!nocrt) {
 584                 printk(KERN_EMERG
 585                         "Critical temperature reached (%ld C), shutting down.\n",
 586                         KELVIN_TO_CELSIUS(tz->temperature));
 587                 orderly_poweroff(true);
 588         }
 589
 590         return 0;
 591 }
 592
 593 static int acpi_thermal_hot(struct acpi_thermal *tz)
 594 {
 595         if (!tz || !tz->trips.hot.flags.valid)
 596                 return -EINVAL;
 597
 598         if (tz->temperature >= tz->trips.hot.temperature) {
 599                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 600                 tz->trips.hot.flags.enabled = 1;
 601         } else if (tz->trips.hot.flags.enabled)
 602                 tz->trips.hot.flags.enabled = 0;
 603
 604         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 605                                 tz->trips.hot.flags.enabled);
 606         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 607                                           dev_name(&tz->device->dev),
 608                                           ACPI_THERMAL_NOTIFY_HOT,
 609                                           tz->trips.hot.flags.enabled);
 610
 611         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 612
 613         return 0;
 614 }
 615
 616 static void acpi_thermal_passive(struct acpi_thermal *tz)
 617 {
 618         int result = 1;
 619         struct acpi_thermal_passive *passive = NULL;
 620         int trend = 0;
 621         int i = 0;
 622
 623
 624         if (!tz || !tz->trips.passive.flags.valid)
 625                 return;
 626
 627         passive = &(tz->trips.passive);
 628
 629         /*
 630          * Above Trip?
 631          * -----------
 632          * Calculate the thermal trend (using the passive cooling equation)
 633          * and modify the performance limit for all passive cooling devices
 634          * accordingly.  Note that we assume symmetry.
 635          */
 636         if (tz->temperature >= passive->temperature) {
 637                 trend =
 638                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 639                     (passive->tc2 * (tz->temperature - passive->temperature));
 640                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 641                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 642                                   trend, passive->tc1, tz->temperature,
 643                                   tz->last_temperature, passive->tc2,
 644                                   tz->temperature, passive->temperature));
 645                 passive->flags.enabled = 1;
 646                 /* Heating up? */
 647                 if (trend > 0)
 648                         for (i = 0; i < passive->devices.count; i++)
 649                                 acpi_processor_set_thermal_limit(passive->
 650                                                                  devices.
 651                                                                  handles[i],
 652                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 653                 /* Cooling off? */
 654                 else if (trend < 0) {
 655                         for (i = 0; i < passive->devices.count; i++)
 656                                 /*
 657                                  * assume that we are on highest
 658                                  * freq/lowest thrott and can leave
 659                                  * passive mode, even in error case
 660                                  */
 661                                 if (!acpi_processor_set_thermal_limit
 662                                     (passive->devices.handles[i],
 663                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 664                                         result = 0;
 665                         /*
 666                          * Leave cooling mode, even if the temp might
 667                          * higher than trip point This is because some
 668                          * machines might have long thermal polling
 669                          * frequencies (tsp) defined. We will fall back
 670                          * into passive mode in next cycle (probably quicker)
 671                          */
 672                         if (result) {
 673                                 passive->flags.enabled = 0;
 674                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 675                                                   "Disabling passive cooling, still above threshold,"
 676                                                   " but we are cooling down\n"));
 677                         }
 678                 }
 679                 return;
 680         }
 681
 682         /*
 683          * Below Trip?
 684          * -----------
 685          * Implement passive cooling hysteresis to slowly increase performance
 686          * and avoid thrashing around the passive trip point.  Note that we
 687          * assume symmetry.
 688          */
 689         if (!passive->flags.enabled)
 690                 return;
 691         for (i = 0; i < passive->devices.count; i++)
 692                 if (!acpi_processor_set_thermal_limit
 693                     (passive->devices.handles[i],
 694                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 695                         result = 0;
 696         if (result) {
 697                 passive->flags.enabled = 0;
 698                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 699                                   "Disabling passive cooling (zone is cool)\n"));
 700         }
 701 }
 702
 703 static void acpi_thermal_active(struct acpi_thermal *tz)
 704 {
 705         int result = 0;
 706         struct acpi_thermal_active *active = NULL;
 707         int i = 0;
 708         int j = 0;
 709         unsigned long maxtemp = 0;
 710
 711
 712         if (!tz)
 713                 return;
 714
 715         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 716                 active = &(tz->trips.active[i]);
 717                 if (!active || !active->flags.valid)
 718                         break;
 719                 if (tz->temperature >= active->temperature) {
 720                         /*
 721                          * Above Threshold?
 722                          * ----------------
 723                          * If not already enabled, turn ON all cooling devices
 724                          * associated with this active threshold.
 725                          */
 726                         if (active->temperature > maxtemp)
 727                                 tz->state.active_index = i;
 728                         maxtemp = active->temperature;
 729                         if (active->flags.enabled)
 730                                 continue;
 731                         for (j = 0; j < active->devices.count; j++) {
 732                                 result =
 733                                     acpi_bus_set_power(active->devices.
 734                                                        handles[j],
 735                                                        ACPI_STATE_D0);
 736                                 if (result) {
 737                                         printk(KERN_WARNING PREFIX
 738                                                       "Unable to turn cooling device [%p] 'on'\n",
 739                                                       active->devices.
 740                                                       handles[j]);
 741                                         continue;
 742                                 }
 743                                 active->flags.enabled = 1;
 744                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 745                                                   "Cooling device [%p] now 'on'\n",
 746                                                   active->devices.handles[j]));
 747                         }
 748                         continue;
 749                 }
 750                 if (!active->flags.enabled)
 751                         continue;
 752                 /*
 753                  * Below Threshold?
 754                  * ----------------
 755                  * Turn OFF all cooling devices associated with this
 756                  * threshold.
 757                  */
 758                 for (j = 0; j < active->devices.count; j++) {
 759                         result = acpi_bus_set_power(active->devices.handles[j],
 760                                                     ACPI_STATE_D3);
 761                         if (result) {
 762                                 printk(KERN_WARNING PREFIX
 763                                               "Unable to turn cooling device [%p] 'off'\n",
 764                                               active->devices.handles[j]);
 765                                 continue;
 766                         }
 767                         active->flags.enabled = 0;
 768                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 769                                           "Cooling device [%p] now 'off'\n",
 770                                           active->devices.handles[j]));
 771                 }
 772         }
 773 }
 774
 775 static void acpi_thermal_check(void *context);
 776
 777 static void acpi_thermal_run(unsigned long data)
 778 {
 779         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 780         if (!tz->zombie)
 781                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 782 }
 783
 784 static void acpi_thermal_active_off(void *data)
 785 {
 786         int result = 0;
 787         struct acpi_thermal *tz = data;
 788         int i = 0;
 789         int j = 0;
 790         struct acpi_thermal_active *active = NULL;
 791
 792         if (!tz) {
 793                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 794                 return;
 795         }
 796
 797         result = acpi_thermal_get_temperature(tz);
 798         if (result)
 799                 return;
 800
 801         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 802                 active = &(tz->trips.active[i]);
 803                 if (!active || !active->flags.valid)
 804                         break;
 805                 if (tz->temperature >= active->temperature) {
 806                         /*
 807                          * If the thermal temperature is greater than the
 808                          * active threshod, unnecessary to turn off the
 809                          * the active cooling device.
 810                          */
 811                         continue;
 812                 }
 813                 /*
 814                  * Below Threshold?
 815                  * ----------------
 816                  * Turn OFF all cooling devices associated with this
 817                  * threshold.
 818                  */
 819                 for (j = 0; j < active->devices.count; j++)
 820                         result = acpi_bus_set_power(active->devices.handles[j],
 821                                                     ACPI_STATE_D3);
 822         }
 823 }
 824
 825 static void acpi_thermal_check(void *data)
 826 {
 827         int result = 0;
 828         struct acpi_thermal *tz = data;
 829         unsigned long sleep_time = 0;
 830         unsigned long timeout_jiffies = 0;
 831         int i = 0;
 832         struct acpi_thermal_state state;
 833
 834
 835         if (!tz) {
 836                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 837                 return;
 838         }
 839
 840         /* Check if someone else is already running */
 841         if (!mutex_trylock(&tz->lock))
 842                 return;
 843
 844         state = tz->state;
 845
 846         result = acpi_thermal_get_temperature(tz);
 847         if (result)
 848                 goto unlock;
 849
 850         if (!tz->tz_enabled)
 851                 goto unlock;
 852
 853         memset(&tz->state, 0, sizeof(tz->state));
 854
 855         /*
 856          * Check Trip Points
 857          * -----------------
 858          * Compare the current temperature to the trip point values to see
 859          * if we've entered one of the thermal policy states.  Note that
 860          * this function determines when a state is entered, but the
 861          * individual policy decides when it is exited (e.g. hysteresis).
 862          */
 863         if (tz->trips.critical.flags.valid)
 864                 state.critical |=
 865                     (tz->temperature >= tz->trips.critical.temperature);
 866         if (tz->trips.hot.flags.valid)
 867                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 868         if (tz->trips.passive.flags.valid)
 869                 state.passive |=
 870                     (tz->temperature >= tz->trips.passive.temperature);
 871         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 872                 if (tz->trips.active[i].flags.valid)
 873                         state.active |=
 874                             (tz->temperature >=
 875                              tz->trips.active[i].temperature);
 876
 877         /*
 878          * Invoke Policy
 879          * -------------
 880          * Separated from the above check to allow individual policy to
 881          * determine when to exit a given state.
 882          */
 883         if (state.critical)
 884                 acpi_thermal_critical(tz);
 885         if (state.hot)
 886                 acpi_thermal_hot(tz);
 887         if (state.passive)
 888                 acpi_thermal_passive(tz);
 889         if (state.active)
 890                 acpi_thermal_active(tz);
 891
 892         /*
 893          * Calculate State
 894          * ---------------
 895          * Again, separated from the above two to allow independent policy
 896          * decisions.
 897          */
 898         tz->state.critical = tz->trips.critical.flags.enabled;
 899         tz->state.hot = tz->trips.hot.flags.enabled;
 900         tz->state.passive = tz->trips.passive.flags.enabled;
 901         tz->state.active = 0;
 902         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 903                 tz->state.active |= tz->trips.active[i].flags.enabled;
 904
 905         /*
 906          * Calculate Sleep Time
 907          * --------------------
 908          * If we're in the passive state, use _TSP's value.  Otherwise
 909          * use the default polling frequency (e.g. _TZP).  If no polling
 910          * frequency is specified then we'll wait forever (at least until
 911          * a thermal event occurs).  Note that _TSP and _TZD values are
 912          * given in 1/10th seconds (we must covert to milliseconds).
 913          */
 914         if (tz->state.passive) {
 915                 sleep_time = tz->trips.passive.tsp * 100;
 916                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 917         } else if (tz->polling_frequency > 0) {
 918                 sleep_time = tz->polling_frequency * 100;
 919                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 920         }
 921
 922         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 923                           tz->name, tz->temperature, sleep_time));
 924
 925         /*
 926          * Schedule Next Poll
 927          * ------------------
 928          */
 929         if (!sleep_time) {
 930                 if (timer_pending(&(tz->timer)))
 931                         del_timer(&(tz->timer));
 932         } else {
 933                 if (timer_pending(&(tz->timer)))
 934                         mod_timer(&(tz->timer), timeout_jiffies);
 935                 else {
 936                         tz->timer.data = (unsigned long)tz;
 937                         tz->timer.function = acpi_thermal_run;
 938                         tz->timer.expires = timeout_jiffies;
 939                         add_timer(&(tz->timer));
 940                 }
 941         }
 942       unlock:
 943         mutex_unlock(&tz->lock);
 944 }
 945
 946 /* sys I/F for generic thermal sysfs support */
 947 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 948
 949 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 950 {
 951         struct acpi_thermal *tz = thermal->devdata;
 952         int result;
 953
 954         if (!tz)
 955                 return -EINVAL;
 956
 957         result = acpi_thermal_get_temperature(tz);
 958         if (result)
 959                 return result;
 960
 961         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
 962 }
 963
 964 static const char enabled[] = "kernel";
 965 static const char disabled[] = "user";
 966 static int thermal_get_mode(struct thermal_zone_device *thermal,
 967                                 char *buf)
 968 {
 969         struct acpi_thermal *tz = thermal->devdata;
 970
 971         if (!tz)
 972                 return -EINVAL;
 973
 974         return sprintf(buf, "%s\n", tz->tz_enabled ?
 975                         enabled : disabled);
 976 }
 977
 978 static int thermal_set_mode(struct thermal_zone_device *thermal,
 979                                 const char *buf)
 980 {
 981         struct acpi_thermal *tz = thermal->devdata;
 982         int enable;
 983
 984         if (!tz)
 985                 return -EINVAL;
 986
 987         /*
 988          * enable/disable thermal management from ACPI thermal driver
 989          */
 990         if (!strncmp(buf, enabled, sizeof enabled - 1))
 991                 enable = 1;
 992         else if (!strncmp(buf, disabled, sizeof disabled - 1))
 993                 enable = 0;
 994         else
 995                 return -EINVAL;
 996
 997         if (enable != tz->tz_enabled) {
 998                 tz->tz_enabled = enable;
 999                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000                         "%s ACPI thermal control\n",
1001                         tz->tz_enabled ? enabled : disabled));
1002                 acpi_thermal_check(tz);
1003         }
1004         return 0;
1005 }
1006
1007 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1008                                  int trip, char *buf)
1009 {
1010         struct acpi_thermal *tz = thermal->devdata;
1011         int i;
1012
1013         if (!tz || trip < 0)
1014                 return -EINVAL;
1015
1016         if (tz->trips.critical.flags.valid) {
1017                 if (!trip)
1018                         return sprintf(buf, "critical\n");
1019                 trip--;
1020         }
1021
1022         if (tz->trips.hot.flags.valid) {
1023                 if (!trip)
1024                         return sprintf(buf, "hot\n");
1025                 trip--;
1026         }
1027
1028         if (tz->trips.passive.flags.valid) {
1029                 if (!trip)
1030                         return sprintf(buf, "passive\n");
1031                 trip--;
1032         }
1033
1034         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1035                 tz->trips.active[i].flags.valid; i++) {
1036                 if (!trip)
1037                         return sprintf(buf, "active%d\n", i);
1038                 trip--;
1039         }
1040
1041         return -EINVAL;
1042 }
1043
1044 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1045                                  int trip, char *buf)
1046 {
1047         struct acpi_thermal *tz = thermal->devdata;
1048         int i;
1049
1050         if (!tz || trip < 0)
1051                 return -EINVAL;
1052
1053         if (tz->trips.critical.flags.valid) {
1054                 if (!trip)
1055                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1056                                 tz->trips.critical.temperature));
1057                 trip--;
1058         }
1059
1060         if (tz->trips.hot.flags.valid) {
1061                 if (!trip)
1062                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1063                                         tz->trips.hot.temperature));
1064                 trip--;
1065         }
1066
1067         if (tz->trips.passive.flags.valid) {
1068                 if (!trip)
1069                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1070                                         tz->trips.passive.temperature));
1071                 trip--;
1072         }
1073
1074         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1075                 tz->trips.active[i].flags.valid; i++) {
1076                 if (!trip)
1077                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1078                                         tz->trips.active[i].temperature));
1079                 trip--;
1080         }
1081
1082         return -EINVAL;
1083 }
1084
1085 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1086                                 unsigned long *temperature) {
1087         struct acpi_thermal *tz = thermal->devdata;
1088
1089         if (tz->trips.critical.flags.valid) {
1090                 *temperature = KELVIN_TO_MILLICELSIUS(
1091                                 tz->trips.critical.temperature);
1092                 return 0;
1093         } else
1094                 return -EINVAL;
1095 }
1096
1097 typedef int (*cb)(struct thermal_zone_device *, int,
1098                   struct thermal_cooling_device *);
1099 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1100                                         struct thermal_cooling_device *cdev,
1101                                         cb action)
1102 {
1103         struct acpi_device *device = cdev->devdata;
1104         struct acpi_thermal *tz = thermal->devdata;
1105         struct acpi_device *dev;
1106         acpi_status status;
1107         acpi_handle handle;
1108         int i;
1109         int j;
1110         int trip = -1;
1111         int result = 0;
1112
1113         if (tz->trips.critical.flags.valid)
1114                 trip++;
1115
1116         if (tz->trips.hot.flags.valid)
1117                 trip++;
1118
1119         if (tz->trips.passive.flags.valid) {
1120                 trip++;
1121                 for (i = 0; i < tz->trips.passive.devices.count;
1122                     i++) {
1123                         handle = tz->trips.passive.devices.handles[i];
1124                         status = acpi_bus_get_device(handle, &dev);
1125                         if (ACPI_SUCCESS(status) && (dev == device)) {
1126                                 result = action(thermal, trip, cdev);
1127                                 if (result)
1128                                         goto failed;
1129                         }
1130                 }
1131         }
1132
1133         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1134                 if (!tz->trips.active[i].flags.valid)
1135                         break;
1136                 trip++;
1137                 for (j = 0;
1138                     j < tz->trips.active[i].devices.count;
1139                     j++) {
1140                         handle = tz->trips.active[i].devices.handles[j];
1141                         status = acpi_bus_get_device(handle, &dev);
1142                         if (ACPI_SUCCESS(status) && (dev == device)) {
1143                                 result = action(thermal, trip, cdev);
1144                                 if (result)
1145                                         goto failed;
1146                         }
1147                 }
1148         }
1149
1150         for (i = 0; i < tz->devices.count; i++) {
1151                 handle = tz->devices.handles[i];
1152                 status = acpi_bus_get_device(handle, &dev);
1153                 if (ACPI_SUCCESS(status) && (dev == device)) {
1154                         result = action(thermal, -1, cdev);
1155                         if (result)
1156                                 goto failed;
1157                 }
1158         }
1159
1160 failed:
1161         return result;
1162 }
1163
1164 static int
1165 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1166                                         struct thermal_cooling_device *cdev)
1167 {
1168         return acpi_thermal_cooling_device_cb(thermal, cdev,
1169                                 thermal_zone_bind_cooling_device);
1170 }
1171
1172 static int
1173 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1174                                         struct thermal_cooling_device *cdev)
1175 {
1176         return acpi_thermal_cooling_device_cb(thermal, cdev,
1177                                 thermal_zone_unbind_cooling_device);
1178 }
1179
1180 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1181         .bind = acpi_thermal_bind_cooling_device,
1182         .unbind = acpi_thermal_unbind_cooling_device,
1183         .get_temp = thermal_get_temp,
1184         .get_mode = thermal_get_mode,
1185         .set_mode = thermal_set_mode,
1186         .get_trip_type = thermal_get_trip_type,
1187         .get_trip_temp = thermal_get_trip_temp,
1188         .get_crit_temp = thermal_get_crit_temp,
1189 };
1190
1191 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1192 {
1193         int trips = 0;
1194         int result;
1195         acpi_status status;
1196         int i;
1197
1198         if (tz->trips.critical.flags.valid)
1199                 trips++;
1200
1201         if (tz->trips.hot.flags.valid)
1202                 trips++;
1203
1204         if (tz->trips.passive.flags.valid)
1205                 trips++;
1206
1207         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1208                         tz->trips.active[i].flags.valid; i++, trips++);
1209         tz->thermal_zone = thermal_zone_device_register("acpitz",
1210                                         trips, tz, &acpi_thermal_zone_ops);
1211         if (IS_ERR(tz->thermal_zone))
1212                 return -ENODEV;
1213
1214         result = sysfs_create_link(&tz->device->dev.kobj,
1215                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1216         if (result)
1217                 return result;
1218
1219         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1220                                    &tz->device->dev.kobj, "device");
1221         if (result)
1222                 return result;
1223
1224         status = acpi_attach_data(tz->device->handle,
1225                                   acpi_bus_private_data_handler,
1226                                   tz->thermal_zone);
1227         if (ACPI_FAILURE(status)) {
1228                 printk(KERN_ERR PREFIX
1229                                 "Error attaching device data\n");
1230                 return -ENODEV;
1231         }
1232
1233         tz->tz_enabled = 1;
1234
1235         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1236                  tz->thermal_zone->id);
1237         return 0;
1238 }
1239
1240 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1241 {
1242         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1243         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1244         thermal_zone_device_unregister(tz->thermal_zone);
1245         tz->thermal_zone = NULL;
1246         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1247 }
1248
1249
1250 /* --------------------------------------------------------------------------
1251                               FS Interface (/proc)
1252    -------------------------------------------------------------------------- */
1253
1254 static struct proc_dir_entry *acpi_thermal_dir;
1255
1256 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1257 {
1258         struct acpi_thermal *tz = seq->private;
1259
1260
1261         if (!tz)
1262                 goto end;
1263
1264         seq_puts(seq, "state:                   ");
1265
1266         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1267             && !tz->state.active)
1268                 seq_puts(seq, "ok\n");
1269         else {
1270                 if (tz->state.critical)
1271                         seq_puts(seq, "critical ");
1272                 if (tz->state.hot)
1273                         seq_puts(seq, "hot ");
1274                 if (tz->state.passive)
1275                         seq_puts(seq, "passive ");
1276                 if (tz->state.active)
1277                         seq_printf(seq, "active[%d]", tz->state.active_index);
1278                 seq_puts(seq, "\n");
1279         }
1280
1281       end:
1282         return 0;
1283 }
1284
1285 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1286 {
1287         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1288 }
1289
1290 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1291 {
1292         int result = 0;
1293         struct acpi_thermal *tz = seq->private;
1294
1295
1296         if (!tz)
1297                 goto end;
1298
1299         result = acpi_thermal_get_temperature(tz);
1300         if (result)
1301                 goto end;
1302
1303         seq_printf(seq, "temperature:             %ld C\n",
1304                    KELVIN_TO_CELSIUS(tz->temperature));
1305
1306       end:
1307         return 0;
1308 }
1309
1310 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1311 {
1312         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1313 }
1314
1315 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1316 {
1317         struct acpi_thermal *tz = seq->private;
1318         struct acpi_device *device;
1319         acpi_status status;
1320
1321         int i = 0;
1322         int j = 0;
1323
1324
1325         if (!tz)
1326                 goto end;
1327
1328         if (tz->trips.critical.flags.valid)
1329                 seq_printf(seq, "critical (S5):           %ld C%s",
1330                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1331                            nocrt ? " <disabled>\n" : "\n");
1332
1333         if (tz->trips.hot.flags.valid)
1334                 seq_printf(seq, "hot (S4):                %ld C%s",
1335                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1336                            nocrt ? " <disabled>\n" : "\n");
1337
1338         if (tz->trips.passive.flags.valid) {
1339                 seq_printf(seq,
1340                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1341                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1342                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1343                            tz->trips.passive.tsp);
1344                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1345                         status = acpi_bus_get_device(tz->trips.passive.devices.
1346                                                      handles[j], &device);
1347                         seq_printf(seq, "%4.4s ", status ? "" :
1348                                    acpi_device_bid(device));
1349                 }
1350                 seq_puts(seq, "\n");
1351         }
1352
1353         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1354                 if (!(tz->trips.active[i].flags.valid))
1355                         break;
1356                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1357                            i,
1358                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1359                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1360                         status = acpi_bus_get_device(tz->trips.active[i].
1361                                                      devices.handles[j],
1362                                                      &device);
1363                         seq_printf(seq, "%4.4s ", status ? "" :
1364                                    acpi_device_bid(device));
1365                 }
1366                 seq_puts(seq, "\n");
1367         }
1368
1369       end:
1370         return 0;
1371 }
1372
1373 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1374 {
1375         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1376 }
1377
1378 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1379 {
1380         struct acpi_thermal *tz = seq->private;
1381
1382
1383         if (!tz)
1384                 goto end;
1385
1386         if (!tz->flags.cooling_mode)
1387                 seq_puts(seq, "<setting not supported>\n");
1388         else
1389                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1390
1391       end:
1392         return 0;
1393 }
1394
1395 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1396 {
1397         return single_open(file, acpi_thermal_cooling_seq_show,
1398                            PDE(inode)->data);
1399 }
1400
1401 static ssize_t
1402 acpi_thermal_write_cooling_mode(struct file *file,
1403                                 const char __user * buffer,
1404                                 size_t count, loff_t * ppos)
1405 {
1406         struct seq_file *m = file->private_data;
1407         struct acpi_thermal *tz = m->private;
1408         int result = 0;
1409         char mode_string[12] = { '\0' };
1410
1411
1412         if (!tz || (count > sizeof(mode_string) - 1))
1413                 return -EINVAL;
1414
1415         if (!tz->flags.cooling_mode)
1416                 return -ENODEV;
1417
1418         if (copy_from_user(mode_string, buffer, count))
1419                 return -EFAULT;
1420
1421         mode_string[count] = '\0';
1422
1423         result = acpi_thermal_set_cooling_mode(tz,
1424                                                simple_strtoul(mode_string, NULL,
1425                                                               0));
1426         if (result)
1427                 return result;
1428
1429         acpi_thermal_check(tz);
1430
1431         return count;
1432 }
1433
1434 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1435 {
1436         struct acpi_thermal *tz = seq->private;
1437
1438
1439         if (!tz)
1440                 goto end;
1441
1442         if (!tz->polling_frequency) {
1443                 seq_puts(seq, "<polling disabled>\n");
1444                 goto end;
1445         }
1446
1447         seq_printf(seq, "polling frequency:       %lu seconds\n",
1448                    (tz->polling_frequency / 10));
1449
1450       end:
1451         return 0;
1452 }
1453
1454 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1455 {
1456         return single_open(file, acpi_thermal_polling_seq_show,
1457                            PDE(inode)->data);
1458 }
1459
1460 static ssize_t
1461 acpi_thermal_write_polling(struct file *file,
1462                            const char __user * buffer,
1463                            size_t count, loff_t * ppos)
1464 {
1465         struct seq_file *m = file->private_data;
1466         struct acpi_thermal *tz = m->private;
1467         int result = 0;
1468         char polling_string[12] = { '\0' };
1469         int seconds = 0;
1470
1471
1472         if (!tz || (count > sizeof(polling_string) - 1))
1473                 return -EINVAL;
1474
1475         if (copy_from_user(polling_string, buffer, count))
1476                 return -EFAULT;
1477
1478         polling_string[count] = '\0';
1479
1480         seconds = simple_strtoul(polling_string, NULL, 0);
1481
1482         result = acpi_thermal_set_polling(tz, seconds);
1483         if (result)
1484                 return result;
1485
1486         acpi_thermal_check(tz);
1487
1488         return count;
1489 }
1490
1491 static int acpi_thermal_add_fs(struct acpi_device *device)
1492 {
1493         struct proc_dir_entry *entry = NULL;
1494
1495
1496         if (!acpi_device_dir(device)) {
1497                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1498                                                      acpi_thermal_dir);
1499                 if (!acpi_device_dir(device))
1500                         return -ENODEV;
1501                 acpi_device_dir(device)->owner = THIS_MODULE;
1502         }
1503
1504         /* 'state' [R] */
1505         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1506                                  S_IRUGO, acpi_device_dir(device),
1507                                  &acpi_thermal_state_fops,
1508                                  acpi_driver_data(device));
1509         if (!entry)
1510                 return -ENODEV;
1511
1512         /* 'temperature' [R] */
1513         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1514                                  S_IRUGO, acpi_device_dir(device),
1515                                  &acpi_thermal_temp_fops,
1516                                  acpi_driver_data(device));
1517         if (!entry)
1518                 return -ENODEV;
1519
1520         /* 'trip_points' [R] */
1521         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1522                                  S_IRUGO,
1523                                  acpi_device_dir(device),
1524                                  &acpi_thermal_trip_fops,
1525                                  acpi_driver_data(device));
1526         if (!entry)
1527                 return -ENODEV;
1528
1529         /* 'cooling_mode' [R/W] */
1530         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1531                                  S_IFREG | S_IRUGO | S_IWUSR,
1532                                  acpi_device_dir(device),
1533                                  &acpi_thermal_cooling_fops,
1534                                  acpi_driver_data(device));
1535         if (!entry)
1536                 return -ENODEV;
1537
1538         /* 'polling_frequency' [R/W] */
1539         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1540                                  S_IFREG | S_IRUGO | S_IWUSR,
1541                                  acpi_device_dir(device),
1542                                  &acpi_thermal_polling_fops,
1543                                  acpi_driver_data(device));
1544         if (!entry)
1545                 return -ENODEV;
1546         return 0;
1547 }
1548
1549 static int acpi_thermal_remove_fs(struct acpi_device *device)
1550 {
1551
1552         if (acpi_device_dir(device)) {
1553                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1554                                   acpi_device_dir(device));
1555                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1556                                   acpi_device_dir(device));
1557                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1558                                   acpi_device_dir(device));
1559                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1560                                   acpi_device_dir(device));
1561                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1562                                   acpi_device_dir(device));
1563                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1564                 acpi_device_dir(device) = NULL;
1565         }
1566
1567         return 0;
1568 }
1569
1570 /* --------------------------------------------------------------------------
1571                                  Driver Interface
1572    -------------------------------------------------------------------------- */
1573
1574 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1575 {
1576         struct acpi_thermal *tz = data;
1577         struct acpi_device *device = NULL;
1578
1579
1580         if (!tz)
1581                 return;
1582
1583         device = tz->device;
1584
1585         switch (event) {
1586         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1587                 acpi_thermal_check(tz);
1588                 break;
1589         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1590                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1591                 acpi_thermal_check(tz);
1592                 acpi_bus_generate_proc_event(device, event, 0);
1593                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1594                                                   dev_name(&device->dev), event, 0);
1595                 break;
1596         case ACPI_THERMAL_NOTIFY_DEVICES:
1597                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1598                 acpi_thermal_check(tz);
1599                 acpi_bus_generate_proc_event(device, event, 0);
1600                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1601                                                   dev_name(&device->dev), event, 0);
1602                 break;
1603         default:
1604                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1605                                   "Unsupported event [0x%x]\n", event));
1606                 break;
1607         }
1608
1609         return;
1610 }
1611
1612 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1613 {
1614         int result = 0;
1615
1616
1617         if (!tz)
1618                 return -EINVAL;
1619
1620         /* Get temperature [_TMP] (required) */
1621         result = acpi_thermal_get_temperature(tz);
1622         if (result)
1623                 return result;
1624
1625         /* Get trip points [_CRT, _PSV, etc.] (required) */
1626         result = acpi_thermal_get_trip_points(tz);
1627         if (result)
1628                 return result;
1629
1630         /* Set the cooling mode [_SCP] to active cooling (default) */
1631         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1632         if (!result)
1633                 tz->flags.cooling_mode = 1;
1634
1635         /* Get default polling frequency [_TZP] (optional) */
1636         if (tzp)
1637                 tz->polling_frequency = tzp;
1638         else
1639                 acpi_thermal_get_polling_frequency(tz);
1640
1641         return 0;
1642 }
1643
1644 static int acpi_thermal_add(struct acpi_device *device)
1645 {
1646         int result = 0;
1647         acpi_status status = AE_OK;
1648         struct acpi_thermal *tz = NULL;
1649
1650
1651         if (!device)
1652                 return -EINVAL;
1653
1654         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1655         if (!tz)
1656                 return -ENOMEM;
1657
1658         tz->device = device;
1659         strcpy(tz->name, device->pnp.bus_id);
1660         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1661         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1662         device->driver_data = tz;
1663         mutex_init(&tz->lock);
1664
1665
1666         result = acpi_thermal_get_info(tz);
1667         if (result)
1668                 goto free_memory;
1669
1670         result = acpi_thermal_register_thermal_zone(tz);
1671         if (result)
1672                 goto free_memory;
1673
1674         result = acpi_thermal_add_fs(device);
1675         if (result)
1676                 goto unregister_thermal_zone;
1677
1678         init_timer(&tz->timer);
1679
1680         acpi_thermal_active_off(tz);
1681
1682         acpi_thermal_check(tz);
1683
1684         status = acpi_install_notify_handler(device->handle,
1685                                              ACPI_DEVICE_NOTIFY,
1686                                              acpi_thermal_notify, tz);
1687         if (ACPI_FAILURE(status)) {
1688                 result = -ENODEV;
1689                 goto remove_fs;
1690         }
1691
1692         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1693                acpi_device_name(device), acpi_device_bid(device),
1694                KELVIN_TO_CELSIUS(tz->temperature));
1695         goto end;
1696
1697 remove_fs:
1698         acpi_thermal_remove_fs(device);
1699 unregister_thermal_zone:
1700         thermal_zone_device_unregister(tz->thermal_zone);
1701 free_memory:
1702         kfree(tz);
1703 end:
1704         return result;
1705 }
1706
1707 static int acpi_thermal_remove(struct acpi_device *device, int type)
1708 {
1709         acpi_status status = AE_OK;
1710         struct acpi_thermal *tz = NULL;
1711
1712
1713         if (!device || !acpi_driver_data(device))
1714                 return -EINVAL;
1715
1716         tz = acpi_driver_data(device);
1717
1718         /* avoid timer adding new defer task */
1719         tz->zombie = 1;
1720         /* wait for running timer (on other CPUs) finish */
1721         del_timer_sync(&(tz->timer));
1722         /* synchronize deferred task */
1723         acpi_os_wait_events_complete(NULL);
1724         /* deferred task may reinsert timer */
1725         del_timer_sync(&(tz->timer));
1726
1727         status = acpi_remove_notify_handler(device->handle,
1728                                             ACPI_DEVICE_NOTIFY,
1729                                             acpi_thermal_notify);
1730
1731         /* Terminate policy */
1732         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1733                 tz->trips.passive.flags.enabled = 0;
1734                 acpi_thermal_passive(tz);
1735         }
1736         if (tz->trips.active[0].flags.valid
1737             && tz->trips.active[0].flags.enabled) {
1738                 tz->trips.active[0].flags.enabled = 0;
1739                 acpi_thermal_active(tz);
1740         }
1741
1742         acpi_thermal_remove_fs(device);
1743         acpi_thermal_unregister_thermal_zone(tz);
1744         mutex_destroy(&tz->lock);
1745         kfree(tz);
1746         return 0;
1747 }
1748
1749 static int acpi_thermal_resume(struct acpi_device *device)
1750 {
1751         struct acpi_thermal *tz = NULL;
1752         int i, j, power_state, result;
1753
1754
1755         if (!device || !acpi_driver_data(device))
1756                 return -EINVAL;
1757
1758         tz = acpi_driver_data(device);
1759
1760         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1761                 if (!(&tz->trips.active[i]))
1762                         break;
1763                 if (!tz->trips.active[i].flags.valid)
1764                         break;
1765                 tz->trips.active[i].flags.enabled = 1;
1766                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1767                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1768                             handles[j], &power_state);
1769                         if (result || (power_state != ACPI_STATE_D0)) {
1770                                 tz->trips.active[i].flags.enabled = 0;
1771                                 break;
1772                         }
1773                 }
1774                 tz->state.active |= tz->trips.active[i].flags.enabled;
1775         }
1776
1777         acpi_thermal_check(tz);
1778
1779         return AE_OK;
1780 }
1781
1782 static int thermal_act(const struct dmi_system_id *d) {
1783
1784         if (act == 0) {
1785                 printk(KERN_NOTICE "ACPI: %s detected: "
1786                         "disabling all active thermal trip points\n", d->ident);
1787                 act = -1;
1788         }
1789         return 0;
1790 }
1791 static int thermal_nocrt(const struct dmi_system_id *d) {
1792
1793         printk(KERN_NOTICE "ACPI: %s detected: "
1794                 "disabling all critical thermal trip point actions.\n", d->ident);
1795         nocrt = 1;
1796         return 0;
1797 }
1798 static int thermal_tzp(const struct dmi_system_id *d) {
1799
1800         if (tzp == 0) {
1801                 printk(KERN_NOTICE "ACPI: %s detected: "
1802                         "enabling thermal zone polling\n", d->ident);
1803                 tzp = 300;      /* 300 dS = 30 Seconds */
1804         }
1805         return 0;
1806 }
1807 static int thermal_psv(const struct dmi_system_id *d) {
1808
1809         if (psv == 0) {
1810                 printk(KERN_NOTICE "ACPI: %s detected: "
1811                         "disabling all passive thermal trip points\n", d->ident);
1812                 psv = -1;
1813         }
1814         return 0;
1815 }
1816
1817 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1818         /*
1819          * Award BIOS on this AOpen makes thermal control almost worthless.
1820          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1821          */
1822         {
1823          .callback = thermal_act,
1824          .ident = "AOpen i915GMm-HFS",
1825          .matches = {
1826                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1827                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1828                 },
1829         },
1830         {
1831          .callback = thermal_psv,
1832          .ident = "AOpen i915GMm-HFS",
1833          .matches = {
1834                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1835                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1836                 },
1837         },
1838         {
1839          .callback = thermal_tzp,
1840          .ident = "AOpen i915GMm-HFS",
1841          .matches = {
1842                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1843                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1844                 },
1845         },
1846         {
1847          .callback = thermal_nocrt,
1848          .ident = "Gigabyte GA-7ZX",
1849          .matches = {
1850                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1851                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1852                 },
1853         },
1854         {}
1855 };
1856
1857 static int __init acpi_thermal_init(void)
1858 {
1859         int result = 0;
1860
1861         dmi_check_system(thermal_dmi_table);
1862
1863         if (off) {
1864                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1865                 return -ENODEV;
1866         }
1867         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1868         if (!acpi_thermal_dir)
1869                 return -ENODEV;
1870         acpi_thermal_dir->owner = THIS_MODULE;
1871
1872         result = acpi_bus_register_driver(&acpi_thermal_driver);
1873         if (result < 0) {
1874                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1875                 return -ENODEV;
1876         }
1877
1878         return 0;
1879 }
1880
1881 static void __exit acpi_thermal_exit(void)
1882 {
1883
1884         acpi_bus_unregister_driver(&acpi_thermal_driver);
1885
1886         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1887
1888         return;
1889 }
1890
1891 module_init(acpi_thermal_init);
1892 module_exit(acpi_thermal_exit);