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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         unsigned long long tmp;
 250
 251         if (!tz)
 252                 return -EINVAL;
 253
 254         tz->last_temperature = tz->temperature;
 255
 256         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 257         if (ACPI_FAILURE(status))
 258                 return -ENODEV;
 259
 260         tz->temperature = tmp;
 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         unsigned long long tmp;
 271
 272         if (!tz)
 273                 return -EINVAL;
 274
 275         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 276         if (ACPI_FAILURE(status))
 277                 return -ENODEV;
 278
 279         tz->polling_frequency = tmp;
 280         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 281                           tz->polling_frequency));
 282
 283         return 0;
 284 }
 285
 286 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 287 {
 288
 289         if (!tz)
 290                 return -EINVAL;
 291
 292         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 293
 294         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 295                           "Polling frequency set to %lu seconds\n",
 296                           tz->polling_frequency/10));
 297
 298         return 0;
 299 }
 300
 301 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 302 {
 303         acpi_status status = AE_OK;
 304         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 305         struct acpi_object_list arg_list = { 1, &arg0 };
 306         acpi_handle handle = NULL;
 307
 308
 309         if (!tz)
 310                 return -EINVAL;
 311
 312         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 313         if (ACPI_FAILURE(status)) {
 314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 315                 return -ENODEV;
 316         }
 317
 318         arg0.integer.value = mode;
 319
 320         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 321         if (ACPI_FAILURE(status))
 322                 return -ENODEV;
 323
 324         return 0;
 325 }
 326
 327 #define ACPI_TRIPS_CRITICAL     0x01
 328 #define ACPI_TRIPS_HOT          0x02
 329 #define ACPI_TRIPS_PASSIVE      0x04
 330 #define ACPI_TRIPS_ACTIVE       0x08
 331 #define ACPI_TRIPS_DEVICES      0x10
 332
 333 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 334 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 335
 336 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 337                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 338                               ACPI_TRIPS_DEVICES)
 339
 340 /*
 341  * This exception is thrown out in two cases:
 342  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 343  *   when re-evaluating the AML code.
 344  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 345  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 346  */
 347 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 348 do {    \
 349         if (flags != ACPI_TRIPS_INIT)   \
 350                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 351                 "ACPI thermal trip point %s changed\n"  \
 352                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 353 } while (0)
 354
 355 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 356 {
 357         acpi_status status = AE_OK;
 358         unsigned long long tmp;
 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, &tmp);
 367                 tz->trips.critical.temperature = tmp;
 368                 /*
 369                  * Treat freezing temperatures as invalid as well; some
 370                  * BIOSes return really low values and cause reboots at startup.
 371                  * Below zero (Celcius) values clearly aren't right for sure..
 372                  * ... so lets discard those as invalid.
 373                  */
 374                 if (ACPI_FAILURE(status) ||
 375                                 tz->trips.critical.temperature <= 2732) {
 376                         tz->trips.critical.flags.valid = 0;
 377                         ACPI_EXCEPTION((AE_INFO, status,
 378                                         "No or invalid critical threshold"));
 379                         return -ENODEV;
 380                 } else {
 381                         tz->trips.critical.flags.valid = 1;
 382                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 383                                         "Found critical threshold [%lu]\n",
 384                                         tz->trips.critical.temperature));
 385                 }
 386                 if (tz->trips.critical.flags.valid == 1) {
 387                         if (crt == -1) {
 388                                 tz->trips.critical.flags.valid = 0;
 389                         } else if (crt > 0) {
 390                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 391                                 /*
 392                                  * Allow override to lower critical threshold
 393                                  */
 394                                 if (crt_k < tz->trips.critical.temperature)
 395                                         tz->trips.critical.temperature = crt_k;
 396                         }
 397                 }
 398         }
 399
 400         /* Critical Sleep (optional) */
 401         if (flag & ACPI_TRIPS_HOT) {
 402                 status = acpi_evaluate_integer(tz->device->handle,
 403                                 "_HOT", NULL, &tmp);
 404                 if (ACPI_FAILURE(status)) {
 405                         tz->trips.hot.flags.valid = 0;
 406                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 407                                         "No hot threshold\n"));
 408                 } else {
 409                         tz->trips.hot.temperature = tmp;
 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                         tmp = CELSIUS_TO_KELVIN(psv);
 424                         status = AE_OK;
 425                 } else {
 426                         status = acpi_evaluate_integer(tz->device->handle,
 427                                 "_PSV", NULL, &tmp);
 428                 }
 429
 430                 if (ACPI_FAILURE(status))
 431                         tz->trips.passive.flags.valid = 0;
 432                 else {
 433                         tz->trips.passive.temperature = tmp;
 434                         tz->trips.passive.flags.valid = 1;
 435                         if (flag == ACPI_TRIPS_INIT) {
 436                                 status = acpi_evaluate_integer(
 437                                                 tz->device->handle, "_TC1",
 438                                                 NULL, &tmp);
 439                                 if (ACPI_FAILURE(status))
 440                                         tz->trips.passive.flags.valid = 0;
 441                                 else
 442                                         tz->trips.passive.tc1 = tmp;
 443                                 status = acpi_evaluate_integer(
 444                                                 tz->device->handle, "_TC2",
 445                                                 NULL, &tmp);
 446                                 if (ACPI_FAILURE(status))
 447                                         tz->trips.passive.flags.valid = 0;
 448                                 else
 449                                         tz->trips.passive.tc2 = tmp;
 450                                 status = acpi_evaluate_integer(
 451                                                 tz->device->handle, "_TSP",
 452                                                 NULL, &tmp);
 453                                 if (ACPI_FAILURE(status))
 454                                         tz->trips.passive.flags.valid = 0;
 455                                 else
 456                                         tz->trips.passive.tsp = tmp;
 457                         }
 458                 }
 459         }
 460         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 461                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 462                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 463                                                         NULL, &devices);
 464                 if (ACPI_FAILURE(status))
 465                         tz->trips.passive.flags.valid = 0;
 466                 else
 467                         tz->trips.passive.flags.valid = 1;
 468
 469                 if (memcmp(&tz->trips.passive.devices, &devices,
 470                                 sizeof(struct acpi_handle_list))) {
 471                         memcpy(&tz->trips.passive.devices, &devices,
 472                                 sizeof(struct acpi_handle_list));
 473                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 474                 }
 475         }
 476         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 477                 if (valid != tz->trips.passive.flags.valid)
 478                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 479         }
 480
 481         /* Active (optional) */
 482         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 483                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 484                 valid = tz->trips.active[i].flags.valid;
 485
 486                 if (act == -1)
 487                         break; /* disable all active trip points */
 488
 489                 if (flag & ACPI_TRIPS_ACTIVE) {
 490                         status = acpi_evaluate_integer(tz->device->handle,
 491                                                         name, NULL, &tmp);
 492                         if (ACPI_FAILURE(status)) {
 493                                 tz->trips.active[i].flags.valid = 0;
 494                                 if (i == 0)
 495                                         break;
 496                                 if (act <= 0)
 497                                         break;
 498                                 if (i == 1)
 499                                         tz->trips.active[0].temperature =
 500                                                 CELSIUS_TO_KELVIN(act);
 501                                 else
 502                                         /*
 503                                          * Don't allow override higher than
 504                                          * the next higher trip point
 505                                          */
 506                                         tz->trips.active[i - 1].temperature =
 507                                                 (tz->trips.active[i - 2].temperature <
 508                                                 CELSIUS_TO_KELVIN(act) ?
 509                                                 tz->trips.active[i - 2].temperature :
 510                                                 CELSIUS_TO_KELVIN(act));
 511                                 break;
 512                         } else {
 513                                 tz->trips.active[i].temperature = tmp;
 514                                 tz->trips.active[i].flags.valid = 1;
 515                         }
 516                 }
 517
 518                 name[2] = 'L';
 519                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 520                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 521                         status = acpi_evaluate_reference(tz->device->handle,
 522                                                 name, NULL, &devices);
 523                         if (ACPI_FAILURE(status))
 524                                 tz->trips.active[i].flags.valid = 0;
 525                         else
 526                                 tz->trips.active[i].flags.valid = 1;
 527
 528                         if (memcmp(&tz->trips.active[i].devices, &devices,
 529                                         sizeof(struct acpi_handle_list))) {
 530                                 memcpy(&tz->trips.active[i].devices, &devices,
 531                                         sizeof(struct acpi_handle_list));
 532                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 533                         }
 534                 }
 535                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 536                         if (valid != tz->trips.active[i].flags.valid)
 537                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 538
 539                 if (!tz->trips.active[i].flags.valid)
 540                         break;
 541         }
 542
 543         if (flag & ACPI_TRIPS_DEVICES) {
 544                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 545                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 546                                                 NULL, &devices);
 547                 if (memcmp(&tz->devices, &devices,
 548                                 sizeof(struct acpi_handle_list))) {
 549                         memcpy(&tz->devices, &devices,
 550                                 sizeof(struct acpi_handle_list));
 551                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 552                 }
 553         }
 554
 555         return 0;
 556 }
 557
 558 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 559 {
 560         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 561 }
 562
 563 static int acpi_thermal_critical(struct acpi_thermal *tz)
 564 {
 565         if (!tz || !tz->trips.critical.flags.valid)
 566                 return -EINVAL;
 567
 568         if (tz->temperature >= tz->trips.critical.temperature) {
 569                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 570                 tz->trips.critical.flags.enabled = 1;
 571         } else if (tz->trips.critical.flags.enabled)
 572                 tz->trips.critical.flags.enabled = 0;
 573
 574         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 575                                 tz->trips.critical.flags.enabled);
 576         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 577                                           tz->device->dev.bus_id,
 578                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 579                                           tz->trips.critical.flags.enabled);
 580
 581         /* take no action if nocrt is set */
 582         if(!nocrt) {
 583                 printk(KERN_EMERG
 584                         "Critical temperature reached (%ld C), shutting down.\n",
 585                         KELVIN_TO_CELSIUS(tz->temperature));
 586                 orderly_poweroff(true);
 587         }
 588
 589         return 0;
 590 }
 591
 592 static int acpi_thermal_hot(struct acpi_thermal *tz)
 593 {
 594         if (!tz || !tz->trips.hot.flags.valid)
 595                 return -EINVAL;
 596
 597         if (tz->temperature >= tz->trips.hot.temperature) {
 598                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 599                 tz->trips.hot.flags.enabled = 1;
 600         } else if (tz->trips.hot.flags.enabled)
 601                 tz->trips.hot.flags.enabled = 0;
 602
 603         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 604                                 tz->trips.hot.flags.enabled);
 605         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 606                                           tz->device->dev.bus_id,
 607                                           ACPI_THERMAL_NOTIFY_HOT,
 608                                           tz->trips.hot.flags.enabled);
 609
 610         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 611
 612         return 0;
 613 }
 614
 615 static void acpi_thermal_passive(struct acpi_thermal *tz)
 616 {
 617         int result = 1;
 618         struct acpi_thermal_passive *passive = NULL;
 619         int trend = 0;
 620         int i = 0;
 621
 622
 623         if (!tz || !tz->trips.passive.flags.valid)
 624                 return;
 625
 626         passive = &(tz->trips.passive);
 627
 628         /*
 629          * Above Trip?
 630          * -----------
 631          * Calculate the thermal trend (using the passive cooling equation)
 632          * and modify the performance limit for all passive cooling devices
 633          * accordingly.  Note that we assume symmetry.
 634          */
 635         if (tz->temperature >= passive->temperature) {
 636                 trend =
 637                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 638                     (passive->tc2 * (tz->temperature - passive->temperature));
 639                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 640                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 641                                   trend, passive->tc1, tz->temperature,
 642                                   tz->last_temperature, passive->tc2,
 643                                   tz->temperature, passive->temperature));
 644                 passive->flags.enabled = 1;
 645                 /* Heating up? */
 646                 if (trend > 0)
 647                         for (i = 0; i < passive->devices.count; i++)
 648                                 acpi_processor_set_thermal_limit(passive->
 649                                                                  devices.
 650                                                                  handles[i],
 651                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 652                 /* Cooling off? */
 653                 else if (trend < 0) {
 654                         for (i = 0; i < passive->devices.count; i++)
 655                                 /*
 656                                  * assume that we are on highest
 657                                  * freq/lowest thrott and can leave
 658                                  * passive mode, even in error case
 659                                  */
 660                                 if (!acpi_processor_set_thermal_limit
 661                                     (passive->devices.handles[i],
 662                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 663                                         result = 0;
 664                         /*
 665                          * Leave cooling mode, even if the temp might
 666                          * higher than trip point This is because some
 667                          * machines might have long thermal polling
 668                          * frequencies (tsp) defined. We will fall back
 669                          * into passive mode in next cycle (probably quicker)
 670                          */
 671                         if (result) {
 672                                 passive->flags.enabled = 0;
 673                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 674                                                   "Disabling passive cooling, still above threshold,"
 675                                                   " but we are cooling down\n"));
 676                         }
 677                 }
 678                 return;
 679         }
 680
 681         /*
 682          * Below Trip?
 683          * -----------
 684          * Implement passive cooling hysteresis to slowly increase performance
 685          * and avoid thrashing around the passive trip point.  Note that we
 686          * assume symmetry.
 687          */
 688         if (!passive->flags.enabled)
 689                 return;
 690         for (i = 0; i < passive->devices.count; i++)
 691                 if (!acpi_processor_set_thermal_limit
 692                     (passive->devices.handles[i],
 693                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 694                         result = 0;
 695         if (result) {
 696                 passive->flags.enabled = 0;
 697                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 698                                   "Disabling passive cooling (zone is cool)\n"));
 699         }
 700 }
 701
 702 static void acpi_thermal_active(struct acpi_thermal *tz)
 703 {
 704         int result = 0;
 705         struct acpi_thermal_active *active = NULL;
 706         int i = 0;
 707         int j = 0;
 708         unsigned long maxtemp = 0;
 709
 710
 711         if (!tz)
 712                 return;
 713
 714         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 715                 active = &(tz->trips.active[i]);
 716                 if (!active || !active->flags.valid)
 717                         break;
 718                 if (tz->temperature >= active->temperature) {
 719                         /*
 720                          * Above Threshold?
 721                          * ----------------
 722                          * If not already enabled, turn ON all cooling devices
 723                          * associated with this active threshold.
 724                          */
 725                         if (active->temperature > maxtemp)
 726                                 tz->state.active_index = i;
 727                         maxtemp = active->temperature;
 728                         if (active->flags.enabled)
 729                                 continue;
 730                         for (j = 0; j < active->devices.count; j++) {
 731                                 result =
 732                                     acpi_bus_set_power(active->devices.
 733                                                        handles[j],
 734                                                        ACPI_STATE_D0);
 735                                 if (result) {
 736                                         printk(KERN_WARNING PREFIX
 737                                                       "Unable to turn cooling device [%p] 'on'\n",
 738                                                       active->devices.
 739                                                       handles[j]);
 740                                         continue;
 741                                 }
 742                                 active->flags.enabled = 1;
 743                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 744                                                   "Cooling device [%p] now 'on'\n",
 745                                                   active->devices.handles[j]));
 746                         }
 747                         continue;
 748                 }
 749                 if (!active->flags.enabled)
 750                         continue;
 751                 /*
 752                  * Below Threshold?
 753                  * ----------------
 754                  * Turn OFF all cooling devices associated with this
 755                  * threshold.
 756                  */
 757                 for (j = 0; j < active->devices.count; j++) {
 758                         result = acpi_bus_set_power(active->devices.handles[j],
 759                                                     ACPI_STATE_D3);
 760                         if (result) {
 761                                 printk(KERN_WARNING PREFIX
 762                                               "Unable to turn cooling device [%p] 'off'\n",
 763                                               active->devices.handles[j]);
 764                                 continue;
 765                         }
 766                         active->flags.enabled = 0;
 767                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 768                                           "Cooling device [%p] now 'off'\n",
 769                                           active->devices.handles[j]));
 770                 }
 771         }
 772 }
 773
 774 static void acpi_thermal_check(void *context);
 775
 776 static void acpi_thermal_run(unsigned long data)
 777 {
 778         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 779         if (!tz->zombie)
 780                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 781 }
 782
 783 static void acpi_thermal_active_off(void *data)
 784 {
 785         int result = 0;
 786         struct acpi_thermal *tz = data;
 787         int i = 0;
 788         int j = 0;
 789         struct acpi_thermal_active *active = NULL;
 790
 791         if (!tz) {
 792                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 793                 return;
 794         }
 795
 796         result = acpi_thermal_get_temperature(tz);
 797         if (result)
 798                 return;
 799
 800         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 801                 active = &(tz->trips.active[i]);
 802                 if (!active || !active->flags.valid)
 803                         break;
 804                 if (tz->temperature >= active->temperature) {
 805                         /*
 806                          * If the thermal temperature is greater than the
 807                          * active threshod, unnecessary to turn off the
 808                          * the active cooling device.
 809                          */
 810                         continue;
 811                 }
 812                 /*
 813                  * Below Threshold?
 814                  * ----------------
 815                  * Turn OFF all cooling devices associated with this
 816                  * threshold.
 817                  */
 818                 for (j = 0; j < active->devices.count; j++)
 819                         result = acpi_bus_set_power(active->devices.handles[j],
 820                                                     ACPI_STATE_D3);
 821         }
 822 }
 823
 824 static void acpi_thermal_check(void *data)
 825 {
 826         int result = 0;
 827         struct acpi_thermal *tz = data;
 828         unsigned long sleep_time = 0;
 829         unsigned long timeout_jiffies = 0;
 830         int i = 0;
 831         struct acpi_thermal_state state;
 832
 833
 834         if (!tz) {
 835                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 836                 return;
 837         }
 838
 839         /* Check if someone else is already running */
 840         if (!mutex_trylock(&tz->lock))
 841                 return;
 842
 843         state = tz->state;
 844
 845         result = acpi_thermal_get_temperature(tz);
 846         if (result)
 847                 goto unlock;
 848
 849         if (!tz->tz_enabled)
 850                 goto unlock;
 851
 852         memset(&tz->state, 0, sizeof(tz->state));
 853
 854         /*
 855          * Check Trip Points
 856          * -----------------
 857          * Compare the current temperature to the trip point values to see
 858          * if we've entered one of the thermal policy states.  Note that
 859          * this function determines when a state is entered, but the
 860          * individual policy decides when it is exited (e.g. hysteresis).
 861          */
 862         if (tz->trips.critical.flags.valid)
 863                 state.critical |=
 864                     (tz->temperature >= tz->trips.critical.temperature);
 865         if (tz->trips.hot.flags.valid)
 866                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 867         if (tz->trips.passive.flags.valid)
 868                 state.passive |=
 869                     (tz->temperature >= tz->trips.passive.temperature);
 870         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 871                 if (tz->trips.active[i].flags.valid)
 872                         state.active |=
 873                             (tz->temperature >=
 874                              tz->trips.active[i].temperature);
 875
 876         /*
 877          * Invoke Policy
 878          * -------------
 879          * Separated from the above check to allow individual policy to
 880          * determine when to exit a given state.
 881          */
 882         if (state.critical)
 883                 acpi_thermal_critical(tz);
 884         if (state.hot)
 885                 acpi_thermal_hot(tz);
 886         if (state.passive)
 887                 acpi_thermal_passive(tz);
 888         if (state.active)
 889                 acpi_thermal_active(tz);
 890
 891         /*
 892          * Calculate State
 893          * ---------------
 894          * Again, separated from the above two to allow independent policy
 895          * decisions.
 896          */
 897         tz->state.critical = tz->trips.critical.flags.enabled;
 898         tz->state.hot = tz->trips.hot.flags.enabled;
 899         tz->state.passive = tz->trips.passive.flags.enabled;
 900         tz->state.active = 0;
 901         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 902                 tz->state.active |= tz->trips.active[i].flags.enabled;
 903
 904         /*
 905          * Calculate Sleep Time
 906          * --------------------
 907          * If we're in the passive state, use _TSP's value.  Otherwise
 908          * use the default polling frequency (e.g. _TZP).  If no polling
 909          * frequency is specified then we'll wait forever (at least until
 910          * a thermal event occurs).  Note that _TSP and _TZD values are
 911          * given in 1/10th seconds (we must covert to milliseconds).
 912          */
 913         if (tz->state.passive) {
 914                 sleep_time = tz->trips.passive.tsp * 100;
 915                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 916         } else if (tz->polling_frequency > 0) {
 917                 sleep_time = tz->polling_frequency * 100;
 918                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 919         }
 920
 921         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 922                           tz->name, tz->temperature, sleep_time));
 923
 924         /*
 925          * Schedule Next Poll
 926          * ------------------
 927          */
 928         if (!sleep_time) {
 929                 if (timer_pending(&(tz->timer)))
 930                         del_timer(&(tz->timer));
 931         } else {
 932                 if (timer_pending(&(tz->timer)))
 933                         mod_timer(&(tz->timer), timeout_jiffies);
 934                 else {
 935                         tz->timer.data = (unsigned long)tz;
 936                         tz->timer.function = acpi_thermal_run;
 937                         tz->timer.expires = timeout_jiffies;
 938                         add_timer(&(tz->timer));
 939                 }
 940         }
 941       unlock:
 942         mutex_unlock(&tz->lock);
 943 }
 944
 945 /* sys I/F for generic thermal sysfs support */
 946 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 947
 948 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 949 {
 950         struct acpi_thermal *tz = thermal->devdata;
 951         int result;
 952
 953         if (!tz)
 954                 return -EINVAL;
 955
 956         result = acpi_thermal_get_temperature(tz);
 957         if (result)
 958                 return result;
 959
 960         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
 961 }
 962
 963 static const char enabled[] = "kernel";
 964 static const char disabled[] = "user";
 965 static int thermal_get_mode(struct thermal_zone_device *thermal,
 966                                 char *buf)
 967 {
 968         struct acpi_thermal *tz = thermal->devdata;
 969
 970         if (!tz)
 971                 return -EINVAL;
 972
 973         return sprintf(buf, "%s\n", tz->tz_enabled ?
 974                         enabled : disabled);
 975 }
 976
 977 static int thermal_set_mode(struct thermal_zone_device *thermal,
 978                                 const char *buf)
 979 {
 980         struct acpi_thermal *tz = thermal->devdata;
 981         int enable;
 982
 983         if (!tz)
 984                 return -EINVAL;
 985
 986         /*
 987          * enable/disable thermal management from ACPI thermal driver
 988          */
 989         if (!strncmp(buf, enabled, sizeof enabled - 1))
 990                 enable = 1;
 991         else if (!strncmp(buf, disabled, sizeof disabled - 1))
 992                 enable = 0;
 993         else
 994                 return -EINVAL;
 995
 996         if (enable != tz->tz_enabled) {
 997                 tz->tz_enabled = enable;
 998                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 999                         "%s ACPI thermal control\n",
1000                         tz->tz_enabled ? enabled : disabled));
1001                 acpi_thermal_check(tz);
1002         }
1003         return 0;
1004 }
1005
1006 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1007                                  int trip, char *buf)
1008 {
1009         struct acpi_thermal *tz = thermal->devdata;
1010         int i;
1011
1012         if (!tz || trip < 0)
1013                 return -EINVAL;
1014
1015         if (tz->trips.critical.flags.valid) {
1016                 if (!trip)
1017                         return sprintf(buf, "critical\n");
1018                 trip--;
1019         }
1020
1021         if (tz->trips.hot.flags.valid) {
1022                 if (!trip)
1023                         return sprintf(buf, "hot\n");
1024                 trip--;
1025         }
1026
1027         if (tz->trips.passive.flags.valid) {
1028                 if (!trip)
1029                         return sprintf(buf, "passive\n");
1030                 trip--;
1031         }
1032
1033         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1034                 tz->trips.active[i].flags.valid; i++) {
1035                 if (!trip)
1036                         return sprintf(buf, "active%d\n", i);
1037                 trip--;
1038         }
1039
1040         return -EINVAL;
1041 }
1042
1043 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1044                                  int trip, char *buf)
1045 {
1046         struct acpi_thermal *tz = thermal->devdata;
1047         int i;
1048
1049         if (!tz || trip < 0)
1050                 return -EINVAL;
1051
1052         if (tz->trips.critical.flags.valid) {
1053                 if (!trip)
1054                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1055                                 tz->trips.critical.temperature));
1056                 trip--;
1057         }
1058
1059         if (tz->trips.hot.flags.valid) {
1060                 if (!trip)
1061                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1062                                         tz->trips.hot.temperature));
1063                 trip--;
1064         }
1065
1066         if (tz->trips.passive.flags.valid) {
1067                 if (!trip)
1068                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1069                                         tz->trips.passive.temperature));
1070                 trip--;
1071         }
1072
1073         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1074                 tz->trips.active[i].flags.valid; i++) {
1075                 if (!trip)
1076                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1077                                         tz->trips.active[i].temperature));
1078                 trip--;
1079         }
1080
1081         return -EINVAL;
1082 }
1083
1084 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1085                                 unsigned long *temperature) {
1086         struct acpi_thermal *tz = thermal->devdata;
1087
1088         if (tz->trips.critical.flags.valid) {
1089                 *temperature = KELVIN_TO_MILLICELSIUS(
1090                                 tz->trips.critical.temperature);
1091                 return 0;
1092         } else
1093                 return -EINVAL;
1094 }
1095
1096 typedef int (*cb)(struct thermal_zone_device *, int,
1097                   struct thermal_cooling_device *);
1098 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1099                                         struct thermal_cooling_device *cdev,
1100                                         cb action)
1101 {
1102         struct acpi_device *device = cdev->devdata;
1103         struct acpi_thermal *tz = thermal->devdata;
1104         struct acpi_device *dev;
1105         acpi_status status;
1106         acpi_handle handle;
1107         int i;
1108         int j;
1109         int trip = -1;
1110         int result = 0;
1111
1112         if (tz->trips.critical.flags.valid)
1113                 trip++;
1114
1115         if (tz->trips.hot.flags.valid)
1116                 trip++;
1117
1118         if (tz->trips.passive.flags.valid) {
1119                 trip++;
1120                 for (i = 0; i < tz->trips.passive.devices.count;
1121                     i++) {
1122                         handle = tz->trips.passive.devices.handles[i];
1123                         status = acpi_bus_get_device(handle, &dev);
1124                         if (ACPI_SUCCESS(status) && (dev == device)) {
1125                                 result = action(thermal, trip, cdev);
1126                                 if (result)
1127                                         goto failed;
1128                         }
1129                 }
1130         }
1131
1132         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1133                 if (!tz->trips.active[i].flags.valid)
1134                         break;
1135                 trip++;
1136                 for (j = 0;
1137                     j < tz->trips.active[i].devices.count;
1138                     j++) {
1139                         handle = tz->trips.active[i].devices.handles[j];
1140                         status = acpi_bus_get_device(handle, &dev);
1141                         if (ACPI_SUCCESS(status) && (dev == device)) {
1142                                 result = action(thermal, trip, cdev);
1143                                 if (result)
1144                                         goto failed;
1145                         }
1146                 }
1147         }
1148
1149         for (i = 0; i < tz->devices.count; i++) {
1150                 handle = tz->devices.handles[i];
1151                 status = acpi_bus_get_device(handle, &dev);
1152                 if (ACPI_SUCCESS(status) && (dev == device)) {
1153                         result = action(thermal, -1, cdev);
1154                         if (result)
1155                                 goto failed;
1156                 }
1157         }
1158
1159 failed:
1160         return result;
1161 }
1162
1163 static int
1164 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1165                                         struct thermal_cooling_device *cdev)
1166 {
1167         return acpi_thermal_cooling_device_cb(thermal, cdev,
1168                                 thermal_zone_bind_cooling_device);
1169 }
1170
1171 static int
1172 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1173                                         struct thermal_cooling_device *cdev)
1174 {
1175         return acpi_thermal_cooling_device_cb(thermal, cdev,
1176                                 thermal_zone_unbind_cooling_device);
1177 }
1178
1179 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1180         .bind = acpi_thermal_bind_cooling_device,
1181         .unbind = acpi_thermal_unbind_cooling_device,
1182         .get_temp = thermal_get_temp,
1183         .get_mode = thermal_get_mode,
1184         .set_mode = thermal_set_mode,
1185         .get_trip_type = thermal_get_trip_type,
1186         .get_trip_temp = thermal_get_trip_temp,
1187         .get_crit_temp = thermal_get_crit_temp,
1188 };
1189
1190 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1191 {
1192         int trips = 0;
1193         int result;
1194         acpi_status status;
1195         int i;
1196
1197         if (tz->trips.critical.flags.valid)
1198                 trips++;
1199
1200         if (tz->trips.hot.flags.valid)
1201                 trips++;
1202
1203         if (tz->trips.passive.flags.valid)
1204                 trips++;
1205
1206         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1207                         tz->trips.active[i].flags.valid; i++, trips++);
1208         tz->thermal_zone = thermal_zone_device_register("acpitz",
1209                                         trips, tz, &acpi_thermal_zone_ops);
1210         if (IS_ERR(tz->thermal_zone))
1211                 return -ENODEV;
1212
1213         result = sysfs_create_link(&tz->device->dev.kobj,
1214                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1215         if (result)
1216                 return result;
1217
1218         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1219                                    &tz->device->dev.kobj, "device");
1220         if (result)
1221                 return result;
1222
1223         status = acpi_attach_data(tz->device->handle,
1224                                   acpi_bus_private_data_handler,
1225                                   tz->thermal_zone);
1226         if (ACPI_FAILURE(status)) {
1227                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1228                                 "Error attaching device data\n"));
1229                 return -ENODEV;
1230         }
1231
1232         tz->tz_enabled = 1;
1233
1234         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1235                  tz->thermal_zone->id);
1236         return 0;
1237 }
1238
1239 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1240 {
1241         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1242         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1243         thermal_zone_device_unregister(tz->thermal_zone);
1244         tz->thermal_zone = NULL;
1245         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1246 }
1247
1248
1249 /* --------------------------------------------------------------------------
1250                               FS Interface (/proc)
1251    -------------------------------------------------------------------------- */
1252
1253 static struct proc_dir_entry *acpi_thermal_dir;
1254
1255 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1256 {
1257         struct acpi_thermal *tz = seq->private;
1258
1259
1260         if (!tz)
1261                 goto end;
1262
1263         seq_puts(seq, "state:                   ");
1264
1265         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1266             && !tz->state.active)
1267                 seq_puts(seq, "ok\n");
1268         else {
1269                 if (tz->state.critical)
1270                         seq_puts(seq, "critical ");
1271                 if (tz->state.hot)
1272                         seq_puts(seq, "hot ");
1273                 if (tz->state.passive)
1274                         seq_puts(seq, "passive ");
1275                 if (tz->state.active)
1276                         seq_printf(seq, "active[%d]", tz->state.active_index);
1277                 seq_puts(seq, "\n");
1278         }
1279
1280       end:
1281         return 0;
1282 }
1283
1284 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1285 {
1286         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1287 }
1288
1289 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1290 {
1291         int result = 0;
1292         struct acpi_thermal *tz = seq->private;
1293
1294
1295         if (!tz)
1296                 goto end;
1297
1298         result = acpi_thermal_get_temperature(tz);
1299         if (result)
1300                 goto end;
1301
1302         seq_printf(seq, "temperature:             %ld C\n",
1303                    KELVIN_TO_CELSIUS(tz->temperature));
1304
1305       end:
1306         return 0;
1307 }
1308
1309 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1310 {
1311         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1312 }
1313
1314 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1315 {
1316         struct acpi_thermal *tz = seq->private;
1317         struct acpi_device *device;
1318         acpi_status status;
1319
1320         int i = 0;
1321         int j = 0;
1322
1323
1324         if (!tz)
1325                 goto end;
1326
1327         if (tz->trips.critical.flags.valid)
1328                 seq_printf(seq, "critical (S5):           %ld C%s",
1329                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1330                            nocrt ? " <disabled>\n" : "\n");
1331
1332         if (tz->trips.hot.flags.valid)
1333                 seq_printf(seq, "hot (S4):                %ld C%s",
1334                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1335                            nocrt ? " <disabled>\n" : "\n");
1336
1337         if (tz->trips.passive.flags.valid) {
1338                 seq_printf(seq,
1339                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1340                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1341                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1342                            tz->trips.passive.tsp);
1343                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1344                         status = acpi_bus_get_device(tz->trips.passive.devices.
1345                                                      handles[j], &device);
1346                         seq_printf(seq, "%4.4s ", status ? "" :
1347                                    acpi_device_bid(device));
1348                 }
1349                 seq_puts(seq, "\n");
1350         }
1351
1352         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1353                 if (!(tz->trips.active[i].flags.valid))
1354                         break;
1355                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1356                            i,
1357                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1358                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1359                         status = acpi_bus_get_device(tz->trips.active[i].
1360                                                      devices.handles[j],
1361                                                      &device);
1362                         seq_printf(seq, "%4.4s ", status ? "" :
1363                                    acpi_device_bid(device));
1364                 }
1365                 seq_puts(seq, "\n");
1366         }
1367
1368       end:
1369         return 0;
1370 }
1371
1372 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1373 {
1374         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1375 }
1376
1377 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1378 {
1379         struct acpi_thermal *tz = seq->private;
1380
1381
1382         if (!tz)
1383                 goto end;
1384
1385         if (!tz->flags.cooling_mode)
1386                 seq_puts(seq, "<setting not supported>\n");
1387         else
1388                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1389
1390       end:
1391         return 0;
1392 }
1393
1394 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1395 {
1396         return single_open(file, acpi_thermal_cooling_seq_show,
1397                            PDE(inode)->data);
1398 }
1399
1400 static ssize_t
1401 acpi_thermal_write_cooling_mode(struct file *file,
1402                                 const char __user * buffer,
1403                                 size_t count, loff_t * ppos)
1404 {
1405         struct seq_file *m = file->private_data;
1406         struct acpi_thermal *tz = m->private;
1407         int result = 0;
1408         char mode_string[12] = { '\0' };
1409
1410
1411         if (!tz || (count > sizeof(mode_string) - 1))
1412                 return -EINVAL;
1413
1414         if (!tz->flags.cooling_mode)
1415                 return -ENODEV;
1416
1417         if (copy_from_user(mode_string, buffer, count))
1418                 return -EFAULT;
1419
1420         mode_string[count] = '\0';
1421
1422         result = acpi_thermal_set_cooling_mode(tz,
1423                                                simple_strtoul(mode_string, NULL,
1424                                                               0));
1425         if (result)
1426                 return result;
1427
1428         acpi_thermal_check(tz);
1429
1430         return count;
1431 }
1432
1433 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1434 {
1435         struct acpi_thermal *tz = seq->private;
1436
1437
1438         if (!tz)
1439                 goto end;
1440
1441         if (!tz->polling_frequency) {
1442                 seq_puts(seq, "<polling disabled>\n");
1443                 goto end;
1444         }
1445
1446         seq_printf(seq, "polling frequency:       %lu seconds\n",
1447                    (tz->polling_frequency / 10));
1448
1449       end:
1450         return 0;
1451 }
1452
1453 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1454 {
1455         return single_open(file, acpi_thermal_polling_seq_show,
1456                            PDE(inode)->data);
1457 }
1458
1459 static ssize_t
1460 acpi_thermal_write_polling(struct file *file,
1461                            const char __user * buffer,
1462                            size_t count, loff_t * ppos)
1463 {
1464         struct seq_file *m = file->private_data;
1465         struct acpi_thermal *tz = m->private;
1466         int result = 0;
1467         char polling_string[12] = { '\0' };
1468         int seconds = 0;
1469
1470
1471         if (!tz || (count > sizeof(polling_string) - 1))
1472                 return -EINVAL;
1473
1474         if (copy_from_user(polling_string, buffer, count))
1475                 return -EFAULT;
1476
1477         polling_string[count] = '\0';
1478
1479         seconds = simple_strtoul(polling_string, NULL, 0);
1480
1481         result = acpi_thermal_set_polling(tz, seconds);
1482         if (result)
1483                 return result;
1484
1485         acpi_thermal_check(tz);
1486
1487         return count;
1488 }
1489
1490 static int acpi_thermal_add_fs(struct acpi_device *device)
1491 {
1492         struct proc_dir_entry *entry = NULL;
1493
1494
1495         if (!acpi_device_dir(device)) {
1496                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1497                                                      acpi_thermal_dir);
1498                 if (!acpi_device_dir(device))
1499                         return -ENODEV;
1500                 acpi_device_dir(device)->owner = THIS_MODULE;
1501         }
1502
1503         /* 'state' [R] */
1504         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1505                                  S_IRUGO, acpi_device_dir(device),
1506                                  &acpi_thermal_state_fops,
1507                                  acpi_driver_data(device));
1508         if (!entry)
1509                 return -ENODEV;
1510
1511         /* 'temperature' [R] */
1512         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1513                                  S_IRUGO, acpi_device_dir(device),
1514                                  &acpi_thermal_temp_fops,
1515                                  acpi_driver_data(device));
1516         if (!entry)
1517                 return -ENODEV;
1518
1519         /* 'trip_points' [R] */
1520         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1521                                  S_IRUGO,
1522                                  acpi_device_dir(device),
1523                                  &acpi_thermal_trip_fops,
1524                                  acpi_driver_data(device));
1525         if (!entry)
1526                 return -ENODEV;
1527
1528         /* 'cooling_mode' [R/W] */
1529         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1530                                  S_IFREG | S_IRUGO | S_IWUSR,
1531                                  acpi_device_dir(device),
1532                                  &acpi_thermal_cooling_fops,
1533                                  acpi_driver_data(device));
1534         if (!entry)
1535                 return -ENODEV;
1536
1537         /* 'polling_frequency' [R/W] */
1538         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1539                                  S_IFREG | S_IRUGO | S_IWUSR,
1540                                  acpi_device_dir(device),
1541                                  &acpi_thermal_polling_fops,
1542                                  acpi_driver_data(device));
1543         if (!entry)
1544                 return -ENODEV;
1545         return 0;
1546 }
1547
1548 static int acpi_thermal_remove_fs(struct acpi_device *device)
1549 {
1550
1551         if (acpi_device_dir(device)) {
1552                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1553                                   acpi_device_dir(device));
1554                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1555                                   acpi_device_dir(device));
1556                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1557                                   acpi_device_dir(device));
1558                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1559                                   acpi_device_dir(device));
1560                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1561                                   acpi_device_dir(device));
1562                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1563                 acpi_device_dir(device) = NULL;
1564         }
1565
1566         return 0;
1567 }
1568
1569 /* --------------------------------------------------------------------------
1570                                  Driver Interface
1571    -------------------------------------------------------------------------- */
1572
1573 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1574 {
1575         struct acpi_thermal *tz = data;
1576         struct acpi_device *device = NULL;
1577
1578
1579         if (!tz)
1580                 return;
1581
1582         device = tz->device;
1583
1584         switch (event) {
1585         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1586                 acpi_thermal_check(tz);
1587                 break;
1588         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1589                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1590                 acpi_thermal_check(tz);
1591                 acpi_bus_generate_proc_event(device, event, 0);
1592                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1593                                                   device->dev.bus_id, event, 0);
1594                 break;
1595         case ACPI_THERMAL_NOTIFY_DEVICES:
1596                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1597                 acpi_thermal_check(tz);
1598                 acpi_bus_generate_proc_event(device, event, 0);
1599                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1600                                                   device->dev.bus_id, event, 0);
1601                 break;
1602         default:
1603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1604                                   "Unsupported event [0x%x]\n", event));
1605                 break;
1606         }
1607
1608         return;
1609 }
1610
1611 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1612 {
1613         int result = 0;
1614
1615
1616         if (!tz)
1617                 return -EINVAL;
1618
1619         /* Get temperature [_TMP] (required) */
1620         result = acpi_thermal_get_temperature(tz);
1621         if (result)
1622                 return result;
1623
1624         /* Get trip points [_CRT, _PSV, etc.] (required) */
1625         result = acpi_thermal_get_trip_points(tz);
1626         if (result)
1627                 return result;
1628
1629         /* Set the cooling mode [_SCP] to active cooling (default) */
1630         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1631         if (!result)
1632                 tz->flags.cooling_mode = 1;
1633
1634         /* Get default polling frequency [_TZP] (optional) */
1635         if (tzp)
1636                 tz->polling_frequency = tzp;
1637         else
1638                 acpi_thermal_get_polling_frequency(tz);
1639
1640         return 0;
1641 }
1642
1643 static int acpi_thermal_add(struct acpi_device *device)
1644 {
1645         int result = 0;
1646         acpi_status status = AE_OK;
1647         struct acpi_thermal *tz = NULL;
1648
1649
1650         if (!device)
1651                 return -EINVAL;
1652
1653         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1654         if (!tz)
1655                 return -ENOMEM;
1656
1657         tz->device = device;
1658         strcpy(tz->name, device->pnp.bus_id);
1659         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1660         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1661         acpi_driver_data(device) = tz;
1662         mutex_init(&tz->lock);
1663
1664
1665         result = acpi_thermal_get_info(tz);
1666         if (result)
1667                 goto free_memory;
1668
1669         result = acpi_thermal_register_thermal_zone(tz);
1670         if (result)
1671                 goto free_memory;
1672
1673         result = acpi_thermal_add_fs(device);
1674         if (result)
1675                 goto unregister_thermal_zone;
1676
1677         init_timer(&tz->timer);
1678
1679         acpi_thermal_active_off(tz);
1680
1681         acpi_thermal_check(tz);
1682
1683         status = acpi_install_notify_handler(device->handle,
1684                                              ACPI_DEVICE_NOTIFY,
1685                                              acpi_thermal_notify, tz);
1686         if (ACPI_FAILURE(status)) {
1687                 result = -ENODEV;
1688                 goto remove_fs;
1689         }
1690
1691         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1692                acpi_device_name(device), acpi_device_bid(device),
1693                KELVIN_TO_CELSIUS(tz->temperature));
1694         goto end;
1695
1696 remove_fs:
1697         acpi_thermal_remove_fs(device);
1698 unregister_thermal_zone:
1699         thermal_zone_device_unregister(tz->thermal_zone);
1700 free_memory:
1701         kfree(tz);
1702 end:
1703         return result;
1704 }
1705
1706 static int acpi_thermal_remove(struct acpi_device *device, int type)
1707 {
1708         acpi_status status = AE_OK;
1709         struct acpi_thermal *tz = NULL;
1710
1711
1712         if (!device || !acpi_driver_data(device))
1713                 return -EINVAL;
1714
1715         tz = acpi_driver_data(device);
1716
1717         /* avoid timer adding new defer task */
1718         tz->zombie = 1;
1719         /* wait for running timer (on other CPUs) finish */
1720         del_timer_sync(&(tz->timer));
1721         /* synchronize deferred task */
1722         acpi_os_wait_events_complete(NULL);
1723         /* deferred task may reinsert timer */
1724         del_timer_sync(&(tz->timer));
1725
1726         status = acpi_remove_notify_handler(device->handle,
1727                                             ACPI_DEVICE_NOTIFY,
1728                                             acpi_thermal_notify);
1729
1730         /* Terminate policy */
1731         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1732                 tz->trips.passive.flags.enabled = 0;
1733                 acpi_thermal_passive(tz);
1734         }
1735         if (tz->trips.active[0].flags.valid
1736             && tz->trips.active[0].flags.enabled) {
1737                 tz->trips.active[0].flags.enabled = 0;
1738                 acpi_thermal_active(tz);
1739         }
1740
1741         acpi_thermal_remove_fs(device);
1742         acpi_thermal_unregister_thermal_zone(tz);
1743         mutex_destroy(&tz->lock);
1744         kfree(tz);
1745         return 0;
1746 }
1747
1748 static int acpi_thermal_resume(struct acpi_device *device)
1749 {
1750         struct acpi_thermal *tz = NULL;
1751         int i, j, power_state, result;
1752
1753
1754         if (!device || !acpi_driver_data(device))
1755                 return -EINVAL;
1756
1757         tz = acpi_driver_data(device);
1758
1759         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1760                 if (!(&tz->trips.active[i]))
1761                         break;
1762                 if (!tz->trips.active[i].flags.valid)
1763                         break;
1764                 tz->trips.active[i].flags.enabled = 1;
1765                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1766                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1767                             handles[j], &power_state);
1768                         if (result || (power_state != ACPI_STATE_D0)) {
1769                                 tz->trips.active[i].flags.enabled = 0;
1770                                 break;
1771                         }
1772                 }
1773                 tz->state.active |= tz->trips.active[i].flags.enabled;
1774         }
1775
1776         acpi_thermal_check(tz);
1777
1778         return AE_OK;
1779 }
1780
1781 static int thermal_act(const struct dmi_system_id *d) {
1782
1783         if (act == 0) {
1784                 printk(KERN_NOTICE "ACPI: %s detected: "
1785                         "disabling all active thermal trip points\n", d->ident);
1786                 act = -1;
1787         }
1788         return 0;
1789 }
1790 static int thermal_nocrt(const struct dmi_system_id *d) {
1791
1792         printk(KERN_NOTICE "ACPI: %s detected: "
1793                 "disabling all critical thermal trip point actions.\n", d->ident);
1794         nocrt = 1;
1795         return 0;
1796 }
1797 static int thermal_tzp(const struct dmi_system_id *d) {
1798
1799         if (tzp == 0) {
1800                 printk(KERN_NOTICE "ACPI: %s detected: "
1801                         "enabling thermal zone polling\n", d->ident);
1802                 tzp = 300;      /* 300 dS = 30 Seconds */
1803         }
1804         return 0;
1805 }
1806 static int thermal_psv(const struct dmi_system_id *d) {
1807
1808         if (psv == 0) {
1809                 printk(KERN_NOTICE "ACPI: %s detected: "
1810                         "disabling all passive thermal trip points\n", d->ident);
1811                 psv = -1;
1812         }
1813         return 0;
1814 }
1815
1816 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1817         /*
1818          * Award BIOS on this AOpen makes thermal control almost worthless.
1819          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1820          */
1821         {
1822          .callback = thermal_act,
1823          .ident = "AOpen i915GMm-HFS",
1824          .matches = {
1825                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1826                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1827                 },
1828         },
1829         {
1830          .callback = thermal_psv,
1831          .ident = "AOpen i915GMm-HFS",
1832          .matches = {
1833                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1834                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1835                 },
1836         },
1837         {
1838          .callback = thermal_tzp,
1839          .ident = "AOpen i915GMm-HFS",
1840          .matches = {
1841                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1842                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1843                 },
1844         },
1845         {
1846          .callback = thermal_nocrt,
1847          .ident = "Gigabyte GA-7ZX",
1848          .matches = {
1849                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1850                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1851                 },
1852         },
1853         {}
1854 };
1855
1856 static int __init acpi_thermal_init(void)
1857 {
1858         int result = 0;
1859
1860         dmi_check_system(thermal_dmi_table);
1861
1862         if (off) {
1863                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1864                 return -ENODEV;
1865         }
1866         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1867         if (!acpi_thermal_dir)
1868                 return -ENODEV;
1869         acpi_thermal_dir->owner = THIS_MODULE;
1870
1871         result = acpi_bus_register_driver(&acpi_thermal_driver);
1872         if (result < 0) {
1873                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1874                 return -ENODEV;
1875         }
1876
1877         return 0;
1878 }
1879
1880 static void __exit acpi_thermal_exit(void)
1881 {
1882
1883         acpi_bus_unregister_driver(&acpi_thermal_driver);
1884
1885         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1886
1887         return;
1888 }
1889
1890 module_init(acpi_thermal_init);
1891 module_exit(acpi_thermal_exit);