drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <linux/device.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 void acpi_thermal_notify(struct acpi_device *device, u32 event);
 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                 .notify = acpi_thermal_notify,
 128                 },
 129 };
 130
 131 struct acpi_thermal_state {
 132         u8 critical:1;
 133         u8 hot:1;
 134         u8 passive:1;
 135         u8 active:1;
 136         u8 reserved:4;
 137         int active_index;
 138 };
 139
 140 struct acpi_thermal_state_flags {
 141         u8 valid:1;
 142         u8 enabled:1;
 143         u8 reserved:6;
 144 };
 145
 146 struct acpi_thermal_critical {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149 };
 150
 151 struct acpi_thermal_hot {
 152         struct acpi_thermal_state_flags flags;
 153         unsigned long temperature;
 154 };
 155
 156 struct acpi_thermal_passive {
 157         struct acpi_thermal_state_flags flags;
 158         unsigned long temperature;
 159         unsigned long tc1;
 160         unsigned long tc2;
 161         unsigned long tsp;
 162         struct acpi_handle_list devices;
 163 };
 164
 165 struct acpi_thermal_active {
 166         struct acpi_thermal_state_flags flags;
 167         unsigned long temperature;
 168         struct acpi_handle_list devices;
 169 };
 170
 171 struct acpi_thermal_trips {
 172         struct acpi_thermal_critical critical;
 173         struct acpi_thermal_hot hot;
 174         struct acpi_thermal_passive passive;
 175         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 176 };
 177
 178 struct acpi_thermal_flags {
 179         u8 cooling_mode:1;      /* _SCP */
 180         u8 devices:1;           /* _TZD */
 181         u8 reserved:6;
 182 };
 183
 184 struct acpi_thermal {
 185         struct acpi_device * device;
 186         acpi_bus_id name;
 187         unsigned long temperature;
 188         unsigned long last_temperature;
 189         unsigned long polling_frequency;
 190         volatile u8 zombie;
 191         struct acpi_thermal_flags flags;
 192         struct acpi_thermal_state state;
 193         struct acpi_thermal_trips trips;
 194         struct acpi_handle_list devices;
 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         tz->thermal_zone->polling_delay = seconds * 1000;
 295
 296         if (tz->tz_enabled)
 297                 thermal_zone_device_update(tz->thermal_zone);
 298
 299         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 300                           "Polling frequency set to %lu seconds\n",
 301                           tz->polling_frequency/10));
 302
 303         return 0;
 304 }
 305
 306 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 307 {
 308         acpi_status status = AE_OK;
 309         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 310         struct acpi_object_list arg_list = { 1, &arg0 };
 311         acpi_handle handle = NULL;
 312
 313
 314         if (!tz)
 315                 return -EINVAL;
 316
 317         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 318         if (ACPI_FAILURE(status)) {
 319                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 320                 return -ENODEV;
 321         }
 322
 323         arg0.integer.value = mode;
 324
 325         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 326         if (ACPI_FAILURE(status))
 327                 return -ENODEV;
 328
 329         return 0;
 330 }
 331
 332 #define ACPI_TRIPS_CRITICAL     0x01
 333 #define ACPI_TRIPS_HOT          0x02
 334 #define ACPI_TRIPS_PASSIVE      0x04
 335 #define ACPI_TRIPS_ACTIVE       0x08
 336 #define ACPI_TRIPS_DEVICES      0x10
 337
 338 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 339 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 340
 341 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 342                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 343                               ACPI_TRIPS_DEVICES)
 344
 345 /*
 346  * This exception is thrown out in two cases:
 347  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 348  *   when re-evaluating the AML code.
 349  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 350  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 351  */
 352 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 353 do {    \
 354         if (flags != ACPI_TRIPS_INIT)   \
 355                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 356                 "ACPI thermal trip point %s changed\n"  \
 357                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 358 } while (0)
 359
 360 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 361 {
 362         acpi_status status = AE_OK;
 363         unsigned long long tmp;
 364         struct acpi_handle_list devices;
 365         int valid = 0;
 366         int i;
 367
 368         /* Critical Shutdown (required) */
 369         if (flag & ACPI_TRIPS_CRITICAL) {
 370                 status = acpi_evaluate_integer(tz->device->handle,
 371                                 "_CRT", NULL, &tmp);
 372                 tz->trips.critical.temperature = tmp;
 373                 /*
 374                  * Treat freezing temperatures as invalid as well; some
 375                  * BIOSes return really low values and cause reboots at startup.
 376                  * Below zero (Celsius) values clearly aren't right for sure..
 377                  * ... so lets discard those as invalid.
 378                  */
 379                 if (ACPI_FAILURE(status) ||
 380                                 tz->trips.critical.temperature <= 2732) {
 381                         tz->trips.critical.flags.valid = 0;
 382                         ACPI_EXCEPTION((AE_INFO, status,
 383                                         "No or invalid critical threshold"));
 384                         return -ENODEV;
 385                 } else {
 386                         tz->trips.critical.flags.valid = 1;
 387                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 388                                         "Found critical threshold [%lu]\n",
 389                                         tz->trips.critical.temperature));
 390                 }
 391                 if (tz->trips.critical.flags.valid == 1) {
 392                         if (crt == -1) {
 393                                 tz->trips.critical.flags.valid = 0;
 394                         } else if (crt > 0) {
 395                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 396                                 /*
 397                                  * Allow override critical threshold
 398                                  */
 399                                 if (crt_k > tz->trips.critical.temperature)
 400                                         printk(KERN_WARNING PREFIX
 401                                                 "Critical threshold %d C\n", crt);
 402                                 tz->trips.critical.temperature = crt_k;
 403                         }
 404                 }
 405         }
 406
 407         /* Critical Sleep (optional) */
 408         if (flag & ACPI_TRIPS_HOT) {
 409                 status = acpi_evaluate_integer(tz->device->handle,
 410                                 "_HOT", NULL, &tmp);
 411                 if (ACPI_FAILURE(status)) {
 412                         tz->trips.hot.flags.valid = 0;
 413                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 414                                         "No hot threshold\n"));
 415                 } else {
 416                         tz->trips.hot.temperature = tmp;
 417                         tz->trips.hot.flags.valid = 1;
 418                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 419                                         "Found hot threshold [%lu]\n",
 420                                         tz->trips.critical.temperature));
 421                 }
 422         }
 423
 424         /* Passive (optional) */
 425         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 426                 (flag == ACPI_TRIPS_INIT)) {
 427                 valid = tz->trips.passive.flags.valid;
 428                 if (psv == -1) {
 429                         status = AE_SUPPORT;
 430                 } else if (psv > 0) {
 431                         tmp = CELSIUS_TO_KELVIN(psv);
 432                         status = AE_OK;
 433                 } else {
 434                         status = acpi_evaluate_integer(tz->device->handle,
 435                                 "_PSV", NULL, &tmp);
 436                 }
 437
 438                 if (ACPI_FAILURE(status))
 439                         tz->trips.passive.flags.valid = 0;
 440                 else {
 441                         tz->trips.passive.temperature = tmp;
 442                         tz->trips.passive.flags.valid = 1;
 443                         if (flag == ACPI_TRIPS_INIT) {
 444                                 status = acpi_evaluate_integer(
 445                                                 tz->device->handle, "_TC1",
 446                                                 NULL, &tmp);
 447                                 if (ACPI_FAILURE(status))
 448                                         tz->trips.passive.flags.valid = 0;
 449                                 else
 450                                         tz->trips.passive.tc1 = tmp;
 451                                 status = acpi_evaluate_integer(
 452                                                 tz->device->handle, "_TC2",
 453                                                 NULL, &tmp);
 454                                 if (ACPI_FAILURE(status))
 455                                         tz->trips.passive.flags.valid = 0;
 456                                 else
 457                                         tz->trips.passive.tc2 = tmp;
 458                                 status = acpi_evaluate_integer(
 459                                                 tz->device->handle, "_TSP",
 460                                                 NULL, &tmp);
 461                                 if (ACPI_FAILURE(status))
 462                                         tz->trips.passive.flags.valid = 0;
 463                                 else
 464                                         tz->trips.passive.tsp = tmp;
 465                         }
 466                 }
 467         }
 468         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 469                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 470                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 471                                                         NULL, &devices);
 472                 if (ACPI_FAILURE(status)) {
 473                         printk(KERN_WARNING PREFIX
 474                                 "Invalid passive threshold\n");
 475                         tz->trips.passive.flags.valid = 0;
 476                 }
 477                 else
 478                         tz->trips.passive.flags.valid = 1;
 479
 480                 if (memcmp(&tz->trips.passive.devices, &devices,
 481                                 sizeof(struct acpi_handle_list))) {
 482                         memcpy(&tz->trips.passive.devices, &devices,
 483                                 sizeof(struct acpi_handle_list));
 484                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 485                 }
 486         }
 487         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 488                 if (valid != tz->trips.passive.flags.valid)
 489                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 490         }
 491
 492         /* Active (optional) */
 493         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 494                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 495                 valid = tz->trips.active[i].flags.valid;
 496
 497                 if (act == -1)
 498                         break; /* disable all active trip points */
 499
 500                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 501                         tz->trips.active[i].flags.valid)) {
 502                         status = acpi_evaluate_integer(tz->device->handle,
 503                                                         name, NULL, &tmp);
 504                         if (ACPI_FAILURE(status)) {
 505                                 tz->trips.active[i].flags.valid = 0;
 506                                 if (i == 0)
 507                                         break;
 508                                 if (act <= 0)
 509                                         break;
 510                                 if (i == 1)
 511                                         tz->trips.active[0].temperature =
 512                                                 CELSIUS_TO_KELVIN(act);
 513                                 else
 514                                         /*
 515                                          * Don't allow override higher than
 516                                          * the next higher trip point
 517                                          */
 518                                         tz->trips.active[i - 1].temperature =
 519                                                 (tz->trips.active[i - 2].temperature <
 520                                                 CELSIUS_TO_KELVIN(act) ?
 521                                                 tz->trips.active[i - 2].temperature :
 522                                                 CELSIUS_TO_KELVIN(act));
 523                                 break;
 524                         } else {
 525                                 tz->trips.active[i].temperature = tmp;
 526                                 tz->trips.active[i].flags.valid = 1;
 527                         }
 528                 }
 529
 530                 name[2] = 'L';
 531                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 532                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 533                         status = acpi_evaluate_reference(tz->device->handle,
 534                                                 name, NULL, &devices);
 535                         if (ACPI_FAILURE(status)) {
 536                                 printk(KERN_WARNING PREFIX
 537                                         "Invalid active%d threshold\n", i);
 538                                 tz->trips.active[i].flags.valid = 0;
 539                         }
 540                         else
 541                                 tz->trips.active[i].flags.valid = 1;
 542
 543                         if (memcmp(&tz->trips.active[i].devices, &devices,
 544                                         sizeof(struct acpi_handle_list))) {
 545                                 memcpy(&tz->trips.active[i].devices, &devices,
 546                                         sizeof(struct acpi_handle_list));
 547                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 548                         }
 549                 }
 550                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 551                         if (valid != tz->trips.active[i].flags.valid)
 552                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 553
 554                 if (!tz->trips.active[i].flags.valid)
 555                         break;
 556         }
 557
 558         if (flag & ACPI_TRIPS_DEVICES) {
 559                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 560                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 561                                                 NULL, &devices);
 562                 if (memcmp(&tz->devices, &devices,
 563                                 sizeof(struct acpi_handle_list))) {
 564                         memcpy(&tz->devices, &devices,
 565                                 sizeof(struct acpi_handle_list));
 566                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 567                 }
 568         }
 569
 570         return 0;
 571 }
 572
 573 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 574 {
 575         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 576 }
 577
 578 static void acpi_thermal_check(void *data)
 579 {
 580         struct acpi_thermal *tz = data;
 581
 582         thermal_zone_device_update(tz->thermal_zone);
 583 }
 584
 585 /* sys I/F for generic thermal sysfs support */
 586 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 587
 588 static int thermal_get_temp(struct thermal_zone_device *thermal,
 589                             unsigned long *temp)
 590 {
 591         struct acpi_thermal *tz = thermal->devdata;
 592         int result;
 593
 594         if (!tz)
 595                 return -EINVAL;
 596
 597         result = acpi_thermal_get_temperature(tz);
 598         if (result)
 599                 return result;
 600
 601         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature);
 602         return 0;
 603 }
 604
 605 static const char enabled[] = "kernel";
 606 static const char disabled[] = "user";
 607 static int thermal_get_mode(struct thermal_zone_device *thermal,
 608                                 enum thermal_device_mode *mode)
 609 {
 610         struct acpi_thermal *tz = thermal->devdata;
 611
 612         if (!tz)
 613                 return -EINVAL;
 614
 615         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 616                 THERMAL_DEVICE_DISABLED;
 617
 618         return 0;
 619 }
 620
 621 static int thermal_set_mode(struct thermal_zone_device *thermal,
 622                                 enum thermal_device_mode mode)
 623 {
 624         struct acpi_thermal *tz = thermal->devdata;
 625         int enable;
 626
 627         if (!tz)
 628                 return -EINVAL;
 629
 630         /*
 631          * enable/disable thermal management from ACPI thermal driver
 632          */
 633         if (mode == THERMAL_DEVICE_ENABLED)
 634                 enable = 1;
 635         else if (mode == THERMAL_DEVICE_DISABLED)
 636                 enable = 0;
 637         else
 638                 return -EINVAL;
 639
 640         if (enable != tz->tz_enabled) {
 641                 tz->tz_enabled = enable;
 642                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 643                         "%s ACPI thermal control\n",
 644                         tz->tz_enabled ? enabled : disabled));
 645                 acpi_thermal_check(tz);
 646         }
 647         return 0;
 648 }
 649
 650 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 651                                  int trip, enum thermal_trip_type *type)
 652 {
 653         struct acpi_thermal *tz = thermal->devdata;
 654         int i;
 655
 656         if (!tz || trip < 0)
 657                 return -EINVAL;
 658
 659         if (tz->trips.critical.flags.valid) {
 660                 if (!trip) {
 661                         *type = THERMAL_TRIP_CRITICAL;
 662                         return 0;
 663                 }
 664                 trip--;
 665         }
 666
 667         if (tz->trips.hot.flags.valid) {
 668                 if (!trip) {
 669                         *type = THERMAL_TRIP_HOT;
 670                         return 0;
 671                 }
 672                 trip--;
 673         }
 674
 675         if (tz->trips.passive.flags.valid) {
 676                 if (!trip) {
 677                         *type = THERMAL_TRIP_PASSIVE;
 678                         return 0;
 679                 }
 680                 trip--;
 681         }
 682
 683         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 684                 tz->trips.active[i].flags.valid; i++) {
 685                 if (!trip) {
 686                         *type = THERMAL_TRIP_ACTIVE;
 687                         return 0;
 688                 }
 689                 trip--;
 690         }
 691
 692         return -EINVAL;
 693 }
 694
 695 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 696                                  int trip, unsigned long *temp)
 697 {
 698         struct acpi_thermal *tz = thermal->devdata;
 699         int i;
 700
 701         if (!tz || trip < 0)
 702                 return -EINVAL;
 703
 704         if (tz->trips.critical.flags.valid) {
 705                 if (!trip) {
 706                         *temp = KELVIN_TO_MILLICELSIUS(
 707                                 tz->trips.critical.temperature);
 708                         return 0;
 709                 }
 710                 trip--;
 711         }
 712
 713         if (tz->trips.hot.flags.valid) {
 714                 if (!trip) {
 715                         *temp = KELVIN_TO_MILLICELSIUS(
 716                                 tz->trips.hot.temperature);
 717                         return 0;
 718                 }
 719                 trip--;
 720         }
 721
 722         if (tz->trips.passive.flags.valid) {
 723                 if (!trip) {
 724                         *temp = KELVIN_TO_MILLICELSIUS(
 725                                 tz->trips.passive.temperature);
 726                         return 0;
 727                 }
 728                 trip--;
 729         }
 730
 731         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 732                 tz->trips.active[i].flags.valid; i++) {
 733                 if (!trip) {
 734                         *temp = KELVIN_TO_MILLICELSIUS(
 735                                 tz->trips.active[i].temperature);
 736                         return 0;
 737                 }
 738                 trip--;
 739         }
 740
 741         return -EINVAL;
 742 }
 743
 744 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 745                                 unsigned long *temperature) {
 746         struct acpi_thermal *tz = thermal->devdata;
 747
 748         if (tz->trips.critical.flags.valid) {
 749                 *temperature = KELVIN_TO_MILLICELSIUS(
 750                                 tz->trips.critical.temperature);
 751                 return 0;
 752         } else
 753                 return -EINVAL;
 754 }
 755
 756 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 757                            enum thermal_trip_type trip_type)
 758 {
 759         u8 type = 0;
 760         struct acpi_thermal *tz = thermal->devdata;
 761
 762         if (trip_type == THERMAL_TRIP_CRITICAL)
 763                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 764         else if (trip_type == THERMAL_TRIP_HOT)
 765                 type = ACPI_THERMAL_NOTIFY_HOT;
 766         else
 767                 return 0;
 768
 769         acpi_bus_generate_proc_event(tz->device, type, 1);
 770         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 771                                         dev_name(&tz->device->dev), type, 1);
 772
 773         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 774                 return 1;
 775
 776         return 0;
 777 }
 778
 779 typedef int (*cb)(struct thermal_zone_device *, int,
 780                   struct thermal_cooling_device *);
 781 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 782                                         struct thermal_cooling_device *cdev,
 783                                         cb action)
 784 {
 785         struct acpi_device *device = cdev->devdata;
 786         struct acpi_thermal *tz = thermal->devdata;
 787         struct acpi_device *dev;
 788         acpi_status status;
 789         acpi_handle handle;
 790         int i;
 791         int j;
 792         int trip = -1;
 793         int result = 0;
 794
 795         if (tz->trips.critical.flags.valid)
 796                 trip++;
 797
 798         if (tz->trips.hot.flags.valid)
 799                 trip++;
 800
 801         if (tz->trips.passive.flags.valid) {
 802                 trip++;
 803                 for (i = 0; i < tz->trips.passive.devices.count;
 804                     i++) {
 805                         handle = tz->trips.passive.devices.handles[i];
 806                         status = acpi_bus_get_device(handle, &dev);
 807                         if (ACPI_SUCCESS(status) && (dev == device)) {
 808                                 result = action(thermal, trip, cdev);
 809                                 if (result)
 810                                         goto failed;
 811                         }
 812                 }
 813         }
 814
 815         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 816                 if (!tz->trips.active[i].flags.valid)
 817                         break;
 818                 trip++;
 819                 for (j = 0;
 820                     j < tz->trips.active[i].devices.count;
 821                     j++) {
 822                         handle = tz->trips.active[i].devices.handles[j];
 823                         status = acpi_bus_get_device(handle, &dev);
 824                         if (ACPI_SUCCESS(status) && (dev == device)) {
 825                                 result = action(thermal, trip, cdev);
 826                                 if (result)
 827                                         goto failed;
 828                         }
 829                 }
 830         }
 831
 832         for (i = 0; i < tz->devices.count; i++) {
 833                 handle = tz->devices.handles[i];
 834                 status = acpi_bus_get_device(handle, &dev);
 835                 if (ACPI_SUCCESS(status) && (dev == device)) {
 836                         result = action(thermal, -1, cdev);
 837                         if (result)
 838                                 goto failed;
 839                 }
 840         }
 841
 842 failed:
 843         return result;
 844 }
 845
 846 static int
 847 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 848                                         struct thermal_cooling_device *cdev)
 849 {
 850         return acpi_thermal_cooling_device_cb(thermal, cdev,
 851                                 thermal_zone_bind_cooling_device);
 852 }
 853
 854 static int
 855 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 856                                         struct thermal_cooling_device *cdev)
 857 {
 858         return acpi_thermal_cooling_device_cb(thermal, cdev,
 859                                 thermal_zone_unbind_cooling_device);
 860 }
 861
 862 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 863         .bind = acpi_thermal_bind_cooling_device,
 864         .unbind = acpi_thermal_unbind_cooling_device,
 865         .get_temp = thermal_get_temp,
 866         .get_mode = thermal_get_mode,
 867         .set_mode = thermal_set_mode,
 868         .get_trip_type = thermal_get_trip_type,
 869         .get_trip_temp = thermal_get_trip_temp,
 870         .get_crit_temp = thermal_get_crit_temp,
 871         .notify = thermal_notify,
 872 };
 873
 874 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 875 {
 876         int trips = 0;
 877         int result;
 878         acpi_status status;
 879         int i;
 880
 881         if (tz->trips.critical.flags.valid)
 882                 trips++;
 883
 884         if (tz->trips.hot.flags.valid)
 885                 trips++;
 886
 887         if (tz->trips.passive.flags.valid)
 888                 trips++;
 889
 890         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 891                         tz->trips.active[i].flags.valid; i++, trips++);
 892
 893         if (tz->trips.passive.flags.valid)
 894                 tz->thermal_zone =
 895                         thermal_zone_device_register("acpitz", trips, tz,
 896                                                      &acpi_thermal_zone_ops,
 897                                                      tz->trips.passive.tc1,
 898                                                      tz->trips.passive.tc2,
 899                                                      tz->trips.passive.tsp*100,
 900                                                      tz->polling_frequency*100);
 901         else
 902                 tz->thermal_zone =
 903                         thermal_zone_device_register("acpitz", trips, tz,
 904                                                      &acpi_thermal_zone_ops,
 905                                                      0, 0, 0,
 906                                                      tz->polling_frequency);
 907         if (IS_ERR(tz->thermal_zone))
 908                 return -ENODEV;
 909
 910         result = sysfs_create_link(&tz->device->dev.kobj,
 911                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 912         if (result)
 913                 return result;
 914
 915         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 916                                    &tz->device->dev.kobj, "device");
 917         if (result)
 918                 return result;
 919
 920         status = acpi_attach_data(tz->device->handle,
 921                                   acpi_bus_private_data_handler,
 922                                   tz->thermal_zone);
 923         if (ACPI_FAILURE(status)) {
 924                 printk(KERN_ERR PREFIX
 925                                 "Error attaching device data\n");
 926                 return -ENODEV;
 927         }
 928
 929         tz->tz_enabled = 1;
 930
 931         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 932                  tz->thermal_zone->id);
 933         return 0;
 934 }
 935
 936 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 937 {
 938         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 939         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 940         thermal_zone_device_unregister(tz->thermal_zone);
 941         tz->thermal_zone = NULL;
 942         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 943 }
 944
 945
 946 /* --------------------------------------------------------------------------
 947                               FS Interface (/proc)
 948    -------------------------------------------------------------------------- */
 949
 950 static struct proc_dir_entry *acpi_thermal_dir;
 951
 952 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 953 {
 954         struct acpi_thermal *tz = seq->private;
 955
 956
 957         if (!tz)
 958                 goto end;
 959
 960         seq_puts(seq, "state:                   ");
 961
 962         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 963             && !tz->state.active)
 964                 seq_puts(seq, "ok\n");
 965         else {
 966                 if (tz->state.critical)
 967                         seq_puts(seq, "critical ");
 968                 if (tz->state.hot)
 969                         seq_puts(seq, "hot ");
 970                 if (tz->state.passive)
 971                         seq_puts(seq, "passive ");
 972                 if (tz->state.active)
 973                         seq_printf(seq, "active[%d]", tz->state.active_index);
 974                 seq_puts(seq, "\n");
 975         }
 976
 977       end:
 978         return 0;
 979 }
 980
 981 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 982 {
 983         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 984 }
 985
 986 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 987 {
 988         int result = 0;
 989         struct acpi_thermal *tz = seq->private;
 990
 991
 992         if (!tz)
 993                 goto end;
 994
 995         result = acpi_thermal_get_temperature(tz);
 996         if (result)
 997                 goto end;
 998
 999         seq_printf(seq, "temperature:             %ld C\n",
1000                    KELVIN_TO_CELSIUS(tz->temperature));
1001
1002       end:
1003         return 0;
1004 }
1005
1006 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1007 {
1008         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1009 }
1010
1011 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1012 {
1013         struct acpi_thermal *tz = seq->private;
1014         struct acpi_device *device;
1015         acpi_status status;
1016
1017         int i = 0;
1018         int j = 0;
1019
1020
1021         if (!tz)
1022                 goto end;
1023
1024         if (tz->trips.critical.flags.valid)
1025                 seq_printf(seq, "critical (S5):           %ld C%s",
1026                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1027                            nocrt ? " <disabled>\n" : "\n");
1028
1029         if (tz->trips.hot.flags.valid)
1030                 seq_printf(seq, "hot (S4):                %ld C%s",
1031                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1032                            nocrt ? " <disabled>\n" : "\n");
1033
1034         if (tz->trips.passive.flags.valid) {
1035                 seq_printf(seq,
1036                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1037                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1038                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1039                            tz->trips.passive.tsp);
1040                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1041                         status = acpi_bus_get_device(tz->trips.passive.devices.
1042                                                      handles[j], &device);
1043                         seq_printf(seq, "%4.4s ", status ? "" :
1044                                    acpi_device_bid(device));
1045                 }
1046                 seq_puts(seq, "\n");
1047         }
1048
1049         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1050                 if (!(tz->trips.active[i].flags.valid))
1051                         break;
1052                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1053                            i,
1054                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1055                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1056                         status = acpi_bus_get_device(tz->trips.active[i].
1057                                                      devices.handles[j],
1058                                                      &device);
1059                         seq_printf(seq, "%4.4s ", status ? "" :
1060                                    acpi_device_bid(device));
1061                 }
1062                 seq_puts(seq, "\n");
1063         }
1064
1065       end:
1066         return 0;
1067 }
1068
1069 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1070 {
1071         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1072 }
1073
1074 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1075 {
1076         struct acpi_thermal *tz = seq->private;
1077
1078
1079         if (!tz)
1080                 goto end;
1081
1082         if (!tz->flags.cooling_mode)
1083                 seq_puts(seq, "<setting not supported>\n");
1084         else
1085                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1086
1087       end:
1088         return 0;
1089 }
1090
1091 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1092 {
1093         return single_open(file, acpi_thermal_cooling_seq_show,
1094                            PDE(inode)->data);
1095 }
1096
1097 static ssize_t
1098 acpi_thermal_write_cooling_mode(struct file *file,
1099                                 const char __user * buffer,
1100                                 size_t count, loff_t * ppos)
1101 {
1102         struct seq_file *m = file->private_data;
1103         struct acpi_thermal *tz = m->private;
1104         int result = 0;
1105         char mode_string[12] = { '\0' };
1106
1107
1108         if (!tz || (count > sizeof(mode_string) - 1))
1109                 return -EINVAL;
1110
1111         if (!tz->flags.cooling_mode)
1112                 return -ENODEV;
1113
1114         if (copy_from_user(mode_string, buffer, count))
1115                 return -EFAULT;
1116
1117         mode_string[count] = '\0';
1118
1119         result = acpi_thermal_set_cooling_mode(tz,
1120                                                simple_strtoul(mode_string, NULL,
1121                                                               0));
1122         if (result)
1123                 return result;
1124
1125         acpi_thermal_check(tz);
1126
1127         return count;
1128 }
1129
1130 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1131 {
1132         struct acpi_thermal *tz = seq->private;
1133
1134
1135         if (!tz)
1136                 goto end;
1137
1138         if (!tz->thermal_zone->polling_delay) {
1139                 seq_puts(seq, "<polling disabled>\n");
1140                 goto end;
1141         }
1142
1143         seq_printf(seq, "polling frequency:       %d seconds\n",
1144                    (tz->thermal_zone->polling_delay / 1000));
1145
1146       end:
1147         return 0;
1148 }
1149
1150 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1151 {
1152         return single_open(file, acpi_thermal_polling_seq_show,
1153                            PDE(inode)->data);
1154 }
1155
1156 static ssize_t
1157 acpi_thermal_write_polling(struct file *file,
1158                            const char __user * buffer,
1159                            size_t count, loff_t * ppos)
1160 {
1161         struct seq_file *m = file->private_data;
1162         struct acpi_thermal *tz = m->private;
1163         int result = 0;
1164         char polling_string[12] = { '\0' };
1165         int seconds = 0;
1166
1167
1168         if (!tz || (count > sizeof(polling_string) - 1))
1169                 return -EINVAL;
1170
1171         if (copy_from_user(polling_string, buffer, count))
1172                 return -EFAULT;
1173
1174         polling_string[count] = '\0';
1175
1176         seconds = simple_strtoul(polling_string, NULL, 0);
1177
1178         result = acpi_thermal_set_polling(tz, seconds);
1179         if (result)
1180                 return result;
1181
1182         acpi_thermal_check(tz);
1183
1184         return count;
1185 }
1186
1187 static int acpi_thermal_add_fs(struct acpi_device *device)
1188 {
1189         struct proc_dir_entry *entry = NULL;
1190
1191
1192         if (!acpi_device_dir(device)) {
1193                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1194                                                      acpi_thermal_dir);
1195                 if (!acpi_device_dir(device))
1196                         return -ENODEV;
1197         }
1198
1199         /* 'state' [R] */
1200         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1201                                  S_IRUGO, acpi_device_dir(device),
1202                                  &acpi_thermal_state_fops,
1203                                  acpi_driver_data(device));
1204         if (!entry)
1205                 return -ENODEV;
1206
1207         /* 'temperature' [R] */
1208         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1209                                  S_IRUGO, acpi_device_dir(device),
1210                                  &acpi_thermal_temp_fops,
1211                                  acpi_driver_data(device));
1212         if (!entry)
1213                 return -ENODEV;
1214
1215         /* 'trip_points' [R] */
1216         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1217                                  S_IRUGO,
1218                                  acpi_device_dir(device),
1219                                  &acpi_thermal_trip_fops,
1220                                  acpi_driver_data(device));
1221         if (!entry)
1222                 return -ENODEV;
1223
1224         /* 'cooling_mode' [R/W] */
1225         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1226                                  S_IFREG | S_IRUGO | S_IWUSR,
1227                                  acpi_device_dir(device),
1228                                  &acpi_thermal_cooling_fops,
1229                                  acpi_driver_data(device));
1230         if (!entry)
1231                 return -ENODEV;
1232
1233         /* 'polling_frequency' [R/W] */
1234         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1235                                  S_IFREG | S_IRUGO | S_IWUSR,
1236                                  acpi_device_dir(device),
1237                                  &acpi_thermal_polling_fops,
1238                                  acpi_driver_data(device));
1239         if (!entry)
1240                 return -ENODEV;
1241         return 0;
1242 }
1243
1244 static int acpi_thermal_remove_fs(struct acpi_device *device)
1245 {
1246
1247         if (acpi_device_dir(device)) {
1248                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1249                                   acpi_device_dir(device));
1250                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1251                                   acpi_device_dir(device));
1252                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1253                                   acpi_device_dir(device));
1254                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1255                                   acpi_device_dir(device));
1256                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1257                                   acpi_device_dir(device));
1258                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1259                 acpi_device_dir(device) = NULL;
1260         }
1261
1262         return 0;
1263 }
1264
1265 /* --------------------------------------------------------------------------
1266                                  Driver Interface
1267    -------------------------------------------------------------------------- */
1268
1269 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1270 {
1271         struct acpi_thermal *tz = acpi_driver_data(device);
1272
1273
1274         if (!tz)
1275                 return;
1276
1277         switch (event) {
1278         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1279                 acpi_thermal_check(tz);
1280                 break;
1281         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1282                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1283                 acpi_thermal_check(tz);
1284                 acpi_bus_generate_proc_event(device, event, 0);
1285                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1286                                                   dev_name(&device->dev), event, 0);
1287                 break;
1288         case ACPI_THERMAL_NOTIFY_DEVICES:
1289                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1290                 acpi_thermal_check(tz);
1291                 acpi_bus_generate_proc_event(device, event, 0);
1292                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1293                                                   dev_name(&device->dev), event, 0);
1294                 break;
1295         default:
1296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1297                                   "Unsupported event [0x%x]\n", event));
1298                 break;
1299         }
1300 }
1301
1302 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1303 {
1304         int result = 0;
1305
1306
1307         if (!tz)
1308                 return -EINVAL;
1309
1310         /* Get temperature [_TMP] (required) */
1311         result = acpi_thermal_get_temperature(tz);
1312         if (result)
1313                 return result;
1314
1315         /* Get trip points [_CRT, _PSV, etc.] (required) */
1316         result = acpi_thermal_get_trip_points(tz);
1317         if (result)
1318                 return result;
1319
1320         /* Set the cooling mode [_SCP] to active cooling (default) */
1321         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1322         if (!result)
1323                 tz->flags.cooling_mode = 1;
1324
1325         /* Get default polling frequency [_TZP] (optional) */
1326         if (tzp)
1327                 tz->polling_frequency = tzp;
1328         else
1329                 acpi_thermal_get_polling_frequency(tz);
1330
1331         return 0;
1332 }
1333
1334 static int acpi_thermal_add(struct acpi_device *device)
1335 {
1336         int result = 0;
1337         struct acpi_thermal *tz = NULL;
1338
1339
1340         if (!device)
1341                 return -EINVAL;
1342
1343         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1344         if (!tz)
1345                 return -ENOMEM;
1346
1347         tz->device = device;
1348         strcpy(tz->name, device->pnp.bus_id);
1349         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1350         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1351         device->driver_data = tz;
1352         mutex_init(&tz->lock);
1353
1354
1355         result = acpi_thermal_get_info(tz);
1356         if (result)
1357                 goto free_memory;
1358
1359         result = acpi_thermal_register_thermal_zone(tz);
1360         if (result)
1361                 goto free_memory;
1362
1363         result = acpi_thermal_add_fs(device);
1364         if (result)
1365                 goto unregister_thermal_zone;
1366
1367         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1368                acpi_device_name(device), acpi_device_bid(device),
1369                KELVIN_TO_CELSIUS(tz->temperature));
1370         goto end;
1371
1372 unregister_thermal_zone:
1373         thermal_zone_device_unregister(tz->thermal_zone);
1374 free_memory:
1375         kfree(tz);
1376 end:
1377         return result;
1378 }
1379
1380 static int acpi_thermal_remove(struct acpi_device *device, int type)
1381 {
1382         struct acpi_thermal *tz = NULL;
1383
1384         if (!device || !acpi_driver_data(device))
1385                 return -EINVAL;
1386
1387         tz = acpi_driver_data(device);
1388
1389         acpi_thermal_remove_fs(device);
1390         acpi_thermal_unregister_thermal_zone(tz);
1391         mutex_destroy(&tz->lock);
1392         kfree(tz);
1393         return 0;
1394 }
1395
1396 static int acpi_thermal_resume(struct acpi_device *device)
1397 {
1398         struct acpi_thermal *tz = NULL;
1399         int i, j, power_state, result;
1400
1401
1402         if (!device || !acpi_driver_data(device))
1403                 return -EINVAL;
1404
1405         tz = acpi_driver_data(device);
1406
1407         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1408                 if (!(&tz->trips.active[i]))
1409                         break;
1410                 if (!tz->trips.active[i].flags.valid)
1411                         break;
1412                 tz->trips.active[i].flags.enabled = 1;
1413                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1414                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1415                             handles[j], &power_state);
1416                         if (result || (power_state != ACPI_STATE_D0)) {
1417                                 tz->trips.active[i].flags.enabled = 0;
1418                                 break;
1419                         }
1420                 }
1421                 tz->state.active |= tz->trips.active[i].flags.enabled;
1422         }
1423
1424         acpi_thermal_check(tz);
1425
1426         return AE_OK;
1427 }
1428
1429 static int thermal_act(const struct dmi_system_id *d) {
1430
1431         if (act == 0) {
1432                 printk(KERN_NOTICE "ACPI: %s detected: "
1433                         "disabling all active thermal trip points\n", d->ident);
1434                 act = -1;
1435         }
1436         return 0;
1437 }
1438 static int thermal_nocrt(const struct dmi_system_id *d) {
1439
1440         printk(KERN_NOTICE "ACPI: %s detected: "
1441                 "disabling all critical thermal trip point actions.\n", d->ident);
1442         nocrt = 1;
1443         return 0;
1444 }
1445 static int thermal_tzp(const struct dmi_system_id *d) {
1446
1447         if (tzp == 0) {
1448                 printk(KERN_NOTICE "ACPI: %s detected: "
1449                         "enabling thermal zone polling\n", d->ident);
1450                 tzp = 300;      /* 300 dS = 30 Seconds */
1451         }
1452         return 0;
1453 }
1454 static int thermal_psv(const struct dmi_system_id *d) {
1455
1456         if (psv == 0) {
1457                 printk(KERN_NOTICE "ACPI: %s detected: "
1458                         "disabling all passive thermal trip points\n", d->ident);
1459                 psv = -1;
1460         }
1461         return 0;
1462 }
1463
1464 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1465         /*
1466          * Award BIOS on this AOpen makes thermal control almost worthless.
1467          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1468          */
1469         {
1470          .callback = thermal_act,
1471          .ident = "AOpen i915GMm-HFS",
1472          .matches = {
1473                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1474                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1475                 },
1476         },
1477         {
1478          .callback = thermal_psv,
1479          .ident = "AOpen i915GMm-HFS",
1480          .matches = {
1481                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1482                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1483                 },
1484         },
1485         {
1486          .callback = thermal_tzp,
1487          .ident = "AOpen i915GMm-HFS",
1488          .matches = {
1489                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1490                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1491                 },
1492         },
1493         {
1494          .callback = thermal_nocrt,
1495          .ident = "Gigabyte GA-7ZX",
1496          .matches = {
1497                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1498                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1499                 },
1500         },
1501         {}
1502 };
1503
1504 static int __init acpi_thermal_init(void)
1505 {
1506         int result = 0;
1507
1508         dmi_check_system(thermal_dmi_table);
1509
1510         if (off) {
1511                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1512                 return -ENODEV;
1513         }
1514         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1515         if (!acpi_thermal_dir)
1516                 return -ENODEV;
1517
1518         result = acpi_bus_register_driver(&acpi_thermal_driver);
1519         if (result < 0) {
1520                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1521                 return -ENODEV;
1522         }
1523
1524         return 0;
1525 }
1526
1527 static void __exit acpi_thermal_exit(void)
1528 {
1529
1530         acpi_bus_unregister_driver(&acpi_thermal_driver);
1531
1532         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1533
1534         return;
1535 }
1536
1537 module_init(acpi_thermal_init);
1538 module_exit(acpi_thermal_exit);