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 PREFIX "ACPI: "
  51
  52 #define ACPI_THERMAL_CLASS              "thermal_zone"
  53 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  54 #define ACPI_THERMAL_FILE_STATE         "state"
  55 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  56 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  57 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  58 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  59 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  60 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  61 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  62 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  63 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  64 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  70 ACPI_MODULE_NAME("thermal");
  71
  72 MODULE_AUTHOR("Paul Diefenbaugh");
  73 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int act;
  77 module_param(act, int, 0644);
  78 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  79
  80 static int crt;
  81 module_param(crt, int, 0644);
  82 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  83
  84 static int tzp;
  85 module_param(tzp, int, 0444);
  86 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  87
  88 static int nocrt;
  89 module_param(nocrt, int, 0);
  90 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  91
  92 static int off;
  93 module_param(off, int, 0);
  94 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  95
  96 static int psv;
  97 module_param(psv, int, 0644);
  98 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  99
 100 static int acpi_thermal_add(struct acpi_device *device);
 101 static int acpi_thermal_remove(struct acpi_device *device, int type);
 102 static int acpi_thermal_resume(struct acpi_device *device);
 103 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 104 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 105 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 108 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 109                                                const char __user *, size_t,
 110                                                loff_t *);
 111 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 112 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 113                                           size_t, loff_t *);
 114
 115 static const struct acpi_device_id  thermal_device_ids[] = {
 116         {ACPI_THERMAL_HID, 0},
 117         {"", 0},
 118 };
 119 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 120
 121 static struct acpi_driver acpi_thermal_driver = {
 122         .name = "thermal",
 123         .class = ACPI_THERMAL_CLASS,
 124         .ids = thermal_device_ids,
 125         .ops = {
 126                 .add = acpi_thermal_add,
 127                 .remove = acpi_thermal_remove,
 128                 .resume = acpi_thermal_resume,
 129                 .notify = acpi_thermal_notify,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct thermal_zone_device *thermal_zone;
 198         int tz_enabled;
 199         int kelvin_offset;
 200         struct mutex lock;
 201 };
 202
 203 static const struct file_operations acpi_thermal_state_fops = {
 204         .owner = THIS_MODULE,
 205         .open = acpi_thermal_state_open_fs,
 206         .read = seq_read,
 207         .llseek = seq_lseek,
 208         .release = single_release,
 209 };
 210
 211 static const struct file_operations acpi_thermal_temp_fops = {
 212         .owner = THIS_MODULE,
 213         .open = acpi_thermal_temp_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static const struct file_operations acpi_thermal_trip_fops = {
 220         .owner = THIS_MODULE,
 221         .open = acpi_thermal_trip_open_fs,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = single_release,
 225 };
 226
 227 static const struct file_operations acpi_thermal_cooling_fops = {
 228         .owner = THIS_MODULE,
 229         .open = acpi_thermal_cooling_open_fs,
 230         .read = seq_read,
 231         .write = acpi_thermal_write_cooling_mode,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static const struct file_operations acpi_thermal_polling_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_thermal_polling_open_fs,
 239         .read = seq_read,
 240         .write = acpi_thermal_write_polling,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 /* --------------------------------------------------------------------------
 246                              Thermal Zone Management
 247    -------------------------------------------------------------------------- */
 248
 249 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 250 {
 251         acpi_status status = AE_OK;
 252         unsigned long long tmp;
 253
 254         if (!tz)
 255                 return -EINVAL;
 256
 257         tz->last_temperature = tz->temperature;
 258
 259         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 260         if (ACPI_FAILURE(status))
 261                 return -ENODEV;
 262
 263         tz->temperature = tmp;
 264         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 265                           tz->temperature));
 266
 267         return 0;
 268 }
 269
 270 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 271 {
 272         acpi_status status = AE_OK;
 273         unsigned long long tmp;
 274
 275         if (!tz)
 276                 return -EINVAL;
 277
 278         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 279         if (ACPI_FAILURE(status))
 280                 return -ENODEV;
 281
 282         tz->polling_frequency = tmp;
 283         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 284                           tz->polling_frequency));
 285
 286         return 0;
 287 }
 288
 289 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 290 {
 291
 292         if (!tz)
 293                 return -EINVAL;
 294
 295         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 296
 297         tz->thermal_zone->polling_delay = seconds * 1000;
 298
 299         if (tz->tz_enabled)
 300                 thermal_zone_device_update(tz->thermal_zone);
 301
 302         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 303                           "Polling frequency set to %lu seconds\n",
 304                           tz->polling_frequency/10));
 305
 306         return 0;
 307 }
 308
 309 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 310 {
 311         acpi_status status = AE_OK;
 312         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 313         struct acpi_object_list arg_list = { 1, &arg0 };
 314         acpi_handle handle = NULL;
 315
 316
 317         if (!tz)
 318                 return -EINVAL;
 319
 320         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 321         if (ACPI_FAILURE(status)) {
 322                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 323                 return -ENODEV;
 324         }
 325
 326         arg0.integer.value = mode;
 327
 328         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 329         if (ACPI_FAILURE(status))
 330                 return -ENODEV;
 331
 332         return 0;
 333 }
 334
 335 #define ACPI_TRIPS_CRITICAL     0x01
 336 #define ACPI_TRIPS_HOT          0x02
 337 #define ACPI_TRIPS_PASSIVE      0x04
 338 #define ACPI_TRIPS_ACTIVE       0x08
 339 #define ACPI_TRIPS_DEVICES      0x10
 340
 341 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 342 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 343
 344 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 345                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 346                               ACPI_TRIPS_DEVICES)
 347
 348 /*
 349  * This exception is thrown out in two cases:
 350  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 351  *   when re-evaluating the AML code.
 352  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 353  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 354  */
 355 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 356 do {    \
 357         if (flags != ACPI_TRIPS_INIT)   \
 358                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 359                 "ACPI thermal trip point %s changed\n"  \
 360                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 361 } while (0)
 362
 363 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 364 {
 365         acpi_status status = AE_OK;
 366         unsigned long long tmp;
 367         struct acpi_handle_list devices;
 368         int valid = 0;
 369         int i;
 370
 371         /* Critical Shutdown (required) */
 372         if (flag & ACPI_TRIPS_CRITICAL) {
 373                 status = acpi_evaluate_integer(tz->device->handle,
 374                                 "_CRT", NULL, &tmp);
 375                 tz->trips.critical.temperature = tmp;
 376                 /*
 377                  * Treat freezing temperatures as invalid as well; some
 378                  * BIOSes return really low values and cause reboots at startup.
 379                  * Below zero (Celsius) values clearly aren't right for sure..
 380                  * ... so lets discard those as invalid.
 381                  */
 382                 if (ACPI_FAILURE(status) ||
 383                                 tz->trips.critical.temperature <= 2732) {
 384                         tz->trips.critical.flags.valid = 0;
 385                         ACPI_EXCEPTION((AE_INFO, status,
 386                                         "No or invalid critical threshold"));
 387                         return -ENODEV;
 388                 } else {
 389                         tz->trips.critical.flags.valid = 1;
 390                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 391                                         "Found critical threshold [%lu]\n",
 392                                         tz->trips.critical.temperature));
 393                 }
 394                 if (tz->trips.critical.flags.valid == 1) {
 395                         if (crt == -1) {
 396                                 tz->trips.critical.flags.valid = 0;
 397                         } else if (crt > 0) {
 398                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 399                                 /*
 400                                  * Allow override critical threshold
 401                                  */
 402                                 if (crt_k > tz->trips.critical.temperature)
 403                                         printk(KERN_WARNING PREFIX
 404                                                 "Critical threshold %d C\n", crt);
 405                                 tz->trips.critical.temperature = crt_k;
 406                         }
 407                 }
 408         }
 409
 410         /* Critical Sleep (optional) */
 411         if (flag & ACPI_TRIPS_HOT) {
 412                 status = acpi_evaluate_integer(tz->device->handle,
 413                                 "_HOT", NULL, &tmp);
 414                 if (ACPI_FAILURE(status)) {
 415                         tz->trips.hot.flags.valid = 0;
 416                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 417                                         "No hot threshold\n"));
 418                 } else {
 419                         tz->trips.hot.temperature = tmp;
 420                         tz->trips.hot.flags.valid = 1;
 421                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 422                                         "Found hot threshold [%lu]\n",
 423                                         tz->trips.critical.temperature));
 424                 }
 425         }
 426
 427         /* Passive (optional) */
 428         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 429                 (flag == ACPI_TRIPS_INIT)) {
 430                 valid = tz->trips.passive.flags.valid;
 431                 if (psv == -1) {
 432                         status = AE_SUPPORT;
 433                 } else if (psv > 0) {
 434                         tmp = CELSIUS_TO_KELVIN(psv);
 435                         status = AE_OK;
 436                 } else {
 437                         status = acpi_evaluate_integer(tz->device->handle,
 438                                 "_PSV", NULL, &tmp);
 439                 }
 440
 441                 if (ACPI_FAILURE(status))
 442                         tz->trips.passive.flags.valid = 0;
 443                 else {
 444                         tz->trips.passive.temperature = tmp;
 445                         tz->trips.passive.flags.valid = 1;
 446                         if (flag == ACPI_TRIPS_INIT) {
 447                                 status = acpi_evaluate_integer(
 448                                                 tz->device->handle, "_TC1",
 449                                                 NULL, &tmp);
 450                                 if (ACPI_FAILURE(status))
 451                                         tz->trips.passive.flags.valid = 0;
 452                                 else
 453                                         tz->trips.passive.tc1 = tmp;
 454                                 status = acpi_evaluate_integer(
 455                                                 tz->device->handle, "_TC2",
 456                                                 NULL, &tmp);
 457                                 if (ACPI_FAILURE(status))
 458                                         tz->trips.passive.flags.valid = 0;
 459                                 else
 460                                         tz->trips.passive.tc2 = tmp;
 461                                 status = acpi_evaluate_integer(
 462                                                 tz->device->handle, "_TSP",
 463                                                 NULL, &tmp);
 464                                 if (ACPI_FAILURE(status))
 465                                         tz->trips.passive.flags.valid = 0;
 466                                 else
 467                                         tz->trips.passive.tsp = tmp;
 468                         }
 469                 }
 470         }
 471         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 472                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 473                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 474                                                         NULL, &devices);
 475                 if (ACPI_FAILURE(status)) {
 476                         printk(KERN_WARNING PREFIX
 477                                 "Invalid passive threshold\n");
 478                         tz->trips.passive.flags.valid = 0;
 479                 }
 480                 else
 481                         tz->trips.passive.flags.valid = 1;
 482
 483                 if (memcmp(&tz->trips.passive.devices, &devices,
 484                                 sizeof(struct acpi_handle_list))) {
 485                         memcpy(&tz->trips.passive.devices, &devices,
 486                                 sizeof(struct acpi_handle_list));
 487                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 488                 }
 489         }
 490         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 491                 if (valid != tz->trips.passive.flags.valid)
 492                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 493         }
 494
 495         /* Active (optional) */
 496         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 497                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 498                 valid = tz->trips.active[i].flags.valid;
 499
 500                 if (act == -1)
 501                         break; /* disable all active trip points */
 502
 503                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 504                         tz->trips.active[i].flags.valid)) {
 505                         status = acpi_evaluate_integer(tz->device->handle,
 506                                                         name, NULL, &tmp);
 507                         if (ACPI_FAILURE(status)) {
 508                                 tz->trips.active[i].flags.valid = 0;
 509                                 if (i == 0)
 510                                         break;
 511                                 if (act <= 0)
 512                                         break;
 513                                 if (i == 1)
 514                                         tz->trips.active[0].temperature =
 515                                                 CELSIUS_TO_KELVIN(act);
 516                                 else
 517                                         /*
 518                                          * Don't allow override higher than
 519                                          * the next higher trip point
 520                                          */
 521                                         tz->trips.active[i - 1].temperature =
 522                                                 (tz->trips.active[i - 2].temperature <
 523                                                 CELSIUS_TO_KELVIN(act) ?
 524                                                 tz->trips.active[i - 2].temperature :
 525                                                 CELSIUS_TO_KELVIN(act));
 526                                 break;
 527                         } else {
 528                                 tz->trips.active[i].temperature = tmp;
 529                                 tz->trips.active[i].flags.valid = 1;
 530                         }
 531                 }
 532
 533                 name[2] = 'L';
 534                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 535                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 536                         status = acpi_evaluate_reference(tz->device->handle,
 537                                                 name, NULL, &devices);
 538                         if (ACPI_FAILURE(status)) {
 539                                 printk(KERN_WARNING PREFIX
 540                                         "Invalid active%d threshold\n", i);
 541                                 tz->trips.active[i].flags.valid = 0;
 542                         }
 543                         else
 544                                 tz->trips.active[i].flags.valid = 1;
 545
 546                         if (memcmp(&tz->trips.active[i].devices, &devices,
 547                                         sizeof(struct acpi_handle_list))) {
 548                                 memcpy(&tz->trips.active[i].devices, &devices,
 549                                         sizeof(struct acpi_handle_list));
 550                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 551                         }
 552                 }
 553                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 554                         if (valid != tz->trips.active[i].flags.valid)
 555                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 556
 557                 if (!tz->trips.active[i].flags.valid)
 558                         break;
 559         }
 560
 561         if (flag & ACPI_TRIPS_DEVICES) {
 562                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 563                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 564                                                 NULL, &devices);
 565                 if (memcmp(&tz->devices, &devices,
 566                                 sizeof(struct acpi_handle_list))) {
 567                         memcpy(&tz->devices, &devices,
 568                                 sizeof(struct acpi_handle_list));
 569                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 570                 }
 571         }
 572
 573         return 0;
 574 }
 575
 576 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 577 {
 578         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 579 }
 580
 581 static void acpi_thermal_check(void *data)
 582 {
 583         struct acpi_thermal *tz = data;
 584
 585         thermal_zone_device_update(tz->thermal_zone);
 586 }
 587
 588 /* sys I/F for generic thermal sysfs support */
 589 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 590
 591 static int thermal_get_temp(struct thermal_zone_device *thermal,
 592                             unsigned long *temp)
 593 {
 594         struct acpi_thermal *tz = thermal->devdata;
 595         int result;
 596
 597         if (!tz)
 598                 return -EINVAL;
 599
 600         result = acpi_thermal_get_temperature(tz);
 601         if (result)
 602                 return result;
 603
 604         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 605         return 0;
 606 }
 607
 608 static const char enabled[] = "kernel";
 609 static const char disabled[] = "user";
 610 static int thermal_get_mode(struct thermal_zone_device *thermal,
 611                                 enum thermal_device_mode *mode)
 612 {
 613         struct acpi_thermal *tz = thermal->devdata;
 614
 615         if (!tz)
 616                 return -EINVAL;
 617
 618         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 619                 THERMAL_DEVICE_DISABLED;
 620
 621         return 0;
 622 }
 623
 624 static int thermal_set_mode(struct thermal_zone_device *thermal,
 625                                 enum thermal_device_mode mode)
 626 {
 627         struct acpi_thermal *tz = thermal->devdata;
 628         int enable;
 629
 630         if (!tz)
 631                 return -EINVAL;
 632
 633         /*
 634          * enable/disable thermal management from ACPI thermal driver
 635          */
 636         if (mode == THERMAL_DEVICE_ENABLED)
 637                 enable = 1;
 638         else if (mode == THERMAL_DEVICE_DISABLED)
 639                 enable = 0;
 640         else
 641                 return -EINVAL;
 642
 643         if (enable != tz->tz_enabled) {
 644                 tz->tz_enabled = enable;
 645                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 646                         "%s ACPI thermal control\n",
 647                         tz->tz_enabled ? enabled : disabled));
 648                 acpi_thermal_check(tz);
 649         }
 650         return 0;
 651 }
 652
 653 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 654                                  int trip, enum thermal_trip_type *type)
 655 {
 656         struct acpi_thermal *tz = thermal->devdata;
 657         int i;
 658
 659         if (!tz || trip < 0)
 660                 return -EINVAL;
 661
 662         if (tz->trips.critical.flags.valid) {
 663                 if (!trip) {
 664                         *type = THERMAL_TRIP_CRITICAL;
 665                         return 0;
 666                 }
 667                 trip--;
 668         }
 669
 670         if (tz->trips.hot.flags.valid) {
 671                 if (!trip) {
 672                         *type = THERMAL_TRIP_HOT;
 673                         return 0;
 674                 }
 675                 trip--;
 676         }
 677
 678         if (tz->trips.passive.flags.valid) {
 679                 if (!trip) {
 680                         *type = THERMAL_TRIP_PASSIVE;
 681                         return 0;
 682                 }
 683                 trip--;
 684         }
 685
 686         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 687                 tz->trips.active[i].flags.valid; i++) {
 688                 if (!trip) {
 689                         *type = THERMAL_TRIP_ACTIVE;
 690                         return 0;
 691                 }
 692                 trip--;
 693         }
 694
 695         return -EINVAL;
 696 }
 697
 698 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 699                                  int trip, unsigned long *temp)
 700 {
 701         struct acpi_thermal *tz = thermal->devdata;
 702         int i;
 703
 704         if (!tz || trip < 0)
 705                 return -EINVAL;
 706
 707         if (tz->trips.critical.flags.valid) {
 708                 if (!trip) {
 709                         *temp = KELVIN_TO_MILLICELSIUS(
 710                                 tz->trips.critical.temperature,
 711                                 tz->kelvin_offset);
 712                         return 0;
 713                 }
 714                 trip--;
 715         }
 716
 717         if (tz->trips.hot.flags.valid) {
 718                 if (!trip) {
 719                         *temp = KELVIN_TO_MILLICELSIUS(
 720                                 tz->trips.hot.temperature,
 721                                 tz->kelvin_offset);
 722                         return 0;
 723                 }
 724                 trip--;
 725         }
 726
 727         if (tz->trips.passive.flags.valid) {
 728                 if (!trip) {
 729                         *temp = KELVIN_TO_MILLICELSIUS(
 730                                 tz->trips.passive.temperature,
 731                                 tz->kelvin_offset);
 732                         return 0;
 733                 }
 734                 trip--;
 735         }
 736
 737         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 738                 tz->trips.active[i].flags.valid; i++) {
 739                 if (!trip) {
 740                         *temp = KELVIN_TO_MILLICELSIUS(
 741                                 tz->trips.active[i].temperature,
 742                                 tz->kelvin_offset);
 743                         return 0;
 744                 }
 745                 trip--;
 746         }
 747
 748         return -EINVAL;
 749 }
 750
 751 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 752                                 unsigned long *temperature) {
 753         struct acpi_thermal *tz = thermal->devdata;
 754
 755         if (tz->trips.critical.flags.valid) {
 756                 *temperature = KELVIN_TO_MILLICELSIUS(
 757                                 tz->trips.critical.temperature,
 758                                 tz->kelvin_offset);
 759                 return 0;
 760         } else
 761                 return -EINVAL;
 762 }
 763
 764 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 765                            enum thermal_trip_type trip_type)
 766 {
 767         u8 type = 0;
 768         struct acpi_thermal *tz = thermal->devdata;
 769
 770         if (trip_type == THERMAL_TRIP_CRITICAL)
 771                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 772         else if (trip_type == THERMAL_TRIP_HOT)
 773                 type = ACPI_THERMAL_NOTIFY_HOT;
 774         else
 775                 return 0;
 776
 777         acpi_bus_generate_proc_event(tz->device, type, 1);
 778         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 779                                         dev_name(&tz->device->dev), type, 1);
 780
 781         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 782                 return 1;
 783
 784         return 0;
 785 }
 786
 787 typedef int (*cb)(struct thermal_zone_device *, int,
 788                   struct thermal_cooling_device *);
 789 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 790                                         struct thermal_cooling_device *cdev,
 791                                         cb action)
 792 {
 793         struct acpi_device *device = cdev->devdata;
 794         struct acpi_thermal *tz = thermal->devdata;
 795         struct acpi_device *dev;
 796         acpi_status status;
 797         acpi_handle handle;
 798         int i;
 799         int j;
 800         int trip = -1;
 801         int result = 0;
 802
 803         if (tz->trips.critical.flags.valid)
 804                 trip++;
 805
 806         if (tz->trips.hot.flags.valid)
 807                 trip++;
 808
 809         if (tz->trips.passive.flags.valid) {
 810                 trip++;
 811                 for (i = 0; i < tz->trips.passive.devices.count;
 812                     i++) {
 813                         handle = tz->trips.passive.devices.handles[i];
 814                         status = acpi_bus_get_device(handle, &dev);
 815                         if (ACPI_SUCCESS(status) && (dev == device)) {
 816                                 result = action(thermal, trip, cdev);
 817                                 if (result)
 818                                         goto failed;
 819                         }
 820                 }
 821         }
 822
 823         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 824                 if (!tz->trips.active[i].flags.valid)
 825                         break;
 826                 trip++;
 827                 for (j = 0;
 828                     j < tz->trips.active[i].devices.count;
 829                     j++) {
 830                         handle = tz->trips.active[i].devices.handles[j];
 831                         status = acpi_bus_get_device(handle, &dev);
 832                         if (ACPI_SUCCESS(status) && (dev == device)) {
 833                                 result = action(thermal, trip, cdev);
 834                                 if (result)
 835                                         goto failed;
 836                         }
 837                 }
 838         }
 839
 840         for (i = 0; i < tz->devices.count; i++) {
 841                 handle = tz->devices.handles[i];
 842                 status = acpi_bus_get_device(handle, &dev);
 843                 if (ACPI_SUCCESS(status) && (dev == device)) {
 844                         result = action(thermal, -1, cdev);
 845                         if (result)
 846                                 goto failed;
 847                 }
 848         }
 849
 850 failed:
 851         return result;
 852 }
 853
 854 static int
 855 acpi_thermal_bind_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_bind_cooling_device);
 860 }
 861
 862 static int
 863 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 864                                         struct thermal_cooling_device *cdev)
 865 {
 866         return acpi_thermal_cooling_device_cb(thermal, cdev,
 867                                 thermal_zone_unbind_cooling_device);
 868 }
 869
 870 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 871         .bind = acpi_thermal_bind_cooling_device,
 872         .unbind = acpi_thermal_unbind_cooling_device,
 873         .get_temp = thermal_get_temp,
 874         .get_mode = thermal_get_mode,
 875         .set_mode = thermal_set_mode,
 876         .get_trip_type = thermal_get_trip_type,
 877         .get_trip_temp = thermal_get_trip_temp,
 878         .get_crit_temp = thermal_get_crit_temp,
 879         .notify = thermal_notify,
 880 };
 881
 882 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 883 {
 884         int trips = 0;
 885         int result;
 886         acpi_status status;
 887         int i;
 888
 889         if (tz->trips.critical.flags.valid)
 890                 trips++;
 891
 892         if (tz->trips.hot.flags.valid)
 893                 trips++;
 894
 895         if (tz->trips.passive.flags.valid)
 896                 trips++;
 897
 898         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 899                         tz->trips.active[i].flags.valid; i++, trips++);
 900
 901         if (tz->trips.passive.flags.valid)
 902                 tz->thermal_zone =
 903                         thermal_zone_device_register("acpitz", trips, tz,
 904                                                      &acpi_thermal_zone_ops,
 905                                                      tz->trips.passive.tc1,
 906                                                      tz->trips.passive.tc2,
 907                                                      tz->trips.passive.tsp*100,
 908                                                      tz->polling_frequency*100);
 909         else
 910                 tz->thermal_zone =
 911                         thermal_zone_device_register("acpitz", trips, tz,
 912                                                      &acpi_thermal_zone_ops,
 913                                                      0, 0, 0,
 914                                                      tz->polling_frequency*100);
 915         if (IS_ERR(tz->thermal_zone))
 916                 return -ENODEV;
 917
 918         result = sysfs_create_link(&tz->device->dev.kobj,
 919                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 920         if (result)
 921                 return result;
 922
 923         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 924                                    &tz->device->dev.kobj, "device");
 925         if (result)
 926                 return result;
 927
 928         status = acpi_attach_data(tz->device->handle,
 929                                   acpi_bus_private_data_handler,
 930                                   tz->thermal_zone);
 931         if (ACPI_FAILURE(status)) {
 932                 printk(KERN_ERR PREFIX
 933                                 "Error attaching device data\n");
 934                 return -ENODEV;
 935         }
 936
 937         tz->tz_enabled = 1;
 938
 939         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 940                  tz->thermal_zone->id);
 941         return 0;
 942 }
 943
 944 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 945 {
 946         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 947         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 948         thermal_zone_device_unregister(tz->thermal_zone);
 949         tz->thermal_zone = NULL;
 950         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 951 }
 952
 953
 954 /* --------------------------------------------------------------------------
 955                               FS Interface (/proc)
 956    -------------------------------------------------------------------------- */
 957
 958 static struct proc_dir_entry *acpi_thermal_dir;
 959
 960 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 961 {
 962         struct acpi_thermal *tz = seq->private;
 963
 964
 965         if (!tz)
 966                 goto end;
 967
 968         seq_puts(seq, "state:                   ");
 969
 970         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 971             && !tz->state.active)
 972                 seq_puts(seq, "ok\n");
 973         else {
 974                 if (tz->state.critical)
 975                         seq_puts(seq, "critical ");
 976                 if (tz->state.hot)
 977                         seq_puts(seq, "hot ");
 978                 if (tz->state.passive)
 979                         seq_puts(seq, "passive ");
 980                 if (tz->state.active)
 981                         seq_printf(seq, "active[%d]", tz->state.active_index);
 982                 seq_puts(seq, "\n");
 983         }
 984
 985       end:
 986         return 0;
 987 }
 988
 989 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 990 {
 991         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 992 }
 993
 994 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 995 {
 996         int result = 0;
 997         struct acpi_thermal *tz = seq->private;
 998
 999
1000         if (!tz)
1001                 goto end;
1002
1003         result = acpi_thermal_get_temperature(tz);
1004         if (result)
1005                 goto end;
1006
1007         seq_printf(seq, "temperature:             %ld C\n",
1008                    KELVIN_TO_CELSIUS(tz->temperature));
1009
1010       end:
1011         return 0;
1012 }
1013
1014 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1015 {
1016         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1017 }
1018
1019 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1020 {
1021         struct acpi_thermal *tz = seq->private;
1022         struct acpi_device *device;
1023         acpi_status status;
1024
1025         int i = 0;
1026         int j = 0;
1027
1028
1029         if (!tz)
1030                 goto end;
1031
1032         if (tz->trips.critical.flags.valid)
1033                 seq_printf(seq, "critical (S5):           %ld C%s",
1034                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1035                            nocrt ? " <disabled>\n" : "\n");
1036
1037         if (tz->trips.hot.flags.valid)
1038                 seq_printf(seq, "hot (S4):                %ld C%s",
1039                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1040                            nocrt ? " <disabled>\n" : "\n");
1041
1042         if (tz->trips.passive.flags.valid) {
1043                 seq_printf(seq,
1044                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1045                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1046                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1047                            tz->trips.passive.tsp);
1048                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1049                         status = acpi_bus_get_device(tz->trips.passive.devices.
1050                                                      handles[j], &device);
1051                         seq_printf(seq, "%4.4s ", status ? "" :
1052                                    acpi_device_bid(device));
1053                 }
1054                 seq_puts(seq, "\n");
1055         } else {
1056                 seq_printf(seq, "passive (forced):");
1057                 if (tz->thermal_zone->forced_passive)
1058                         seq_printf(seq, "        %i C\n",
1059                                    tz->thermal_zone->forced_passive / 1000);
1060                 else
1061                         seq_printf(seq, "<not set>\n");
1062         }
1063
1064         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1065                 if (!(tz->trips.active[i].flags.valid))
1066                         break;
1067                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1068                            i,
1069                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1070                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1071                         status = acpi_bus_get_device(tz->trips.active[i].
1072                                                      devices.handles[j],
1073                                                      &device);
1074                         seq_printf(seq, "%4.4s ", status ? "" :
1075                                    acpi_device_bid(device));
1076                 }
1077                 seq_puts(seq, "\n");
1078         }
1079
1080       end:
1081         return 0;
1082 }
1083
1084 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1085 {
1086         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1087 }
1088
1089 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1090 {
1091         struct acpi_thermal *tz = seq->private;
1092
1093
1094         if (!tz)
1095                 goto end;
1096
1097         if (!tz->flags.cooling_mode)
1098                 seq_puts(seq, "<setting not supported>\n");
1099         else
1100                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1101
1102       end:
1103         return 0;
1104 }
1105
1106 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1107 {
1108         return single_open(file, acpi_thermal_cooling_seq_show,
1109                            PDE(inode)->data);
1110 }
1111
1112 static ssize_t
1113 acpi_thermal_write_cooling_mode(struct file *file,
1114                                 const char __user * buffer,
1115                                 size_t count, loff_t * ppos)
1116 {
1117         struct seq_file *m = file->private_data;
1118         struct acpi_thermal *tz = m->private;
1119         int result = 0;
1120         char mode_string[12] = { '\0' };
1121
1122
1123         if (!tz || (count > sizeof(mode_string) - 1))
1124                 return -EINVAL;
1125
1126         if (!tz->flags.cooling_mode)
1127                 return -ENODEV;
1128
1129         if (copy_from_user(mode_string, buffer, count))
1130                 return -EFAULT;
1131
1132         mode_string[count] = '\0';
1133
1134         result = acpi_thermal_set_cooling_mode(tz,
1135                                                simple_strtoul(mode_string, NULL,
1136                                                               0));
1137         if (result)
1138                 return result;
1139
1140         acpi_thermal_check(tz);
1141
1142         return count;
1143 }
1144
1145 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1146 {
1147         struct acpi_thermal *tz = seq->private;
1148
1149
1150         if (!tz)
1151                 goto end;
1152
1153         if (!tz->thermal_zone->polling_delay) {
1154                 seq_puts(seq, "<polling disabled>\n");
1155                 goto end;
1156         }
1157
1158         seq_printf(seq, "polling frequency:       %d seconds\n",
1159                    (tz->thermal_zone->polling_delay / 1000));
1160
1161       end:
1162         return 0;
1163 }
1164
1165 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1166 {
1167         return single_open(file, acpi_thermal_polling_seq_show,
1168                            PDE(inode)->data);
1169 }
1170
1171 static ssize_t
1172 acpi_thermal_write_polling(struct file *file,
1173                            const char __user * buffer,
1174                            size_t count, loff_t * ppos)
1175 {
1176         struct seq_file *m = file->private_data;
1177         struct acpi_thermal *tz = m->private;
1178         int result = 0;
1179         char polling_string[12] = { '\0' };
1180         int seconds = 0;
1181
1182
1183         if (!tz || (count > sizeof(polling_string) - 1))
1184                 return -EINVAL;
1185
1186         if (copy_from_user(polling_string, buffer, count))
1187                 return -EFAULT;
1188
1189         polling_string[count] = '\0';
1190
1191         seconds = simple_strtoul(polling_string, NULL, 0);
1192
1193         result = acpi_thermal_set_polling(tz, seconds);
1194         if (result)
1195                 return result;
1196
1197         acpi_thermal_check(tz);
1198
1199         return count;
1200 }
1201
1202 static int acpi_thermal_add_fs(struct acpi_device *device)
1203 {
1204         struct proc_dir_entry *entry = NULL;
1205
1206
1207         if (!acpi_device_dir(device)) {
1208                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1209                                                      acpi_thermal_dir);
1210                 if (!acpi_device_dir(device))
1211                         return -ENODEV;
1212         }
1213
1214         /* 'state' [R] */
1215         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1216                                  S_IRUGO, acpi_device_dir(device),
1217                                  &acpi_thermal_state_fops,
1218                                  acpi_driver_data(device));
1219         if (!entry)
1220                 return -ENODEV;
1221
1222         /* 'temperature' [R] */
1223         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1224                                  S_IRUGO, acpi_device_dir(device),
1225                                  &acpi_thermal_temp_fops,
1226                                  acpi_driver_data(device));
1227         if (!entry)
1228                 return -ENODEV;
1229
1230         /* 'trip_points' [R] */
1231         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1232                                  S_IRUGO,
1233                                  acpi_device_dir(device),
1234                                  &acpi_thermal_trip_fops,
1235                                  acpi_driver_data(device));
1236         if (!entry)
1237                 return -ENODEV;
1238
1239         /* 'cooling_mode' [R/W] */
1240         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1241                                  S_IFREG | S_IRUGO | S_IWUSR,
1242                                  acpi_device_dir(device),
1243                                  &acpi_thermal_cooling_fops,
1244                                  acpi_driver_data(device));
1245         if (!entry)
1246                 return -ENODEV;
1247
1248         /* 'polling_frequency' [R/W] */
1249         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1250                                  S_IFREG | S_IRUGO | S_IWUSR,
1251                                  acpi_device_dir(device),
1252                                  &acpi_thermal_polling_fops,
1253                                  acpi_driver_data(device));
1254         if (!entry)
1255                 return -ENODEV;
1256         return 0;
1257 }
1258
1259 static int acpi_thermal_remove_fs(struct acpi_device *device)
1260 {
1261
1262         if (acpi_device_dir(device)) {
1263                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1264                                   acpi_device_dir(device));
1265                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1266                                   acpi_device_dir(device));
1267                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1268                                   acpi_device_dir(device));
1269                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1270                                   acpi_device_dir(device));
1271                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1272                                   acpi_device_dir(device));
1273                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1274                 acpi_device_dir(device) = NULL;
1275         }
1276
1277         return 0;
1278 }
1279
1280 /* --------------------------------------------------------------------------
1281                                  Driver Interface
1282    -------------------------------------------------------------------------- */
1283
1284 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1285 {
1286         struct acpi_thermal *tz = acpi_driver_data(device);
1287
1288
1289         if (!tz)
1290                 return;
1291
1292         switch (event) {
1293         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1294                 acpi_thermal_check(tz);
1295                 break;
1296         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1297                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1298                 acpi_thermal_check(tz);
1299                 acpi_bus_generate_proc_event(device, event, 0);
1300                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1301                                                   dev_name(&device->dev), event, 0);
1302                 break;
1303         case ACPI_THERMAL_NOTIFY_DEVICES:
1304                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1305                 acpi_thermal_check(tz);
1306                 acpi_bus_generate_proc_event(device, event, 0);
1307                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1308                                                   dev_name(&device->dev), event, 0);
1309                 break;
1310         default:
1311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1312                                   "Unsupported event [0x%x]\n", event));
1313                 break;
1314         }
1315 }
1316
1317 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1318 {
1319         int result = 0;
1320
1321
1322         if (!tz)
1323                 return -EINVAL;
1324
1325         /* Get temperature [_TMP] (required) */
1326         result = acpi_thermal_get_temperature(tz);
1327         if (result)
1328                 return result;
1329
1330         /* Get trip points [_CRT, _PSV, etc.] (required) */
1331         result = acpi_thermal_get_trip_points(tz);
1332         if (result)
1333                 return result;
1334
1335         /* Set the cooling mode [_SCP] to active cooling (default) */
1336         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1337         if (!result)
1338                 tz->flags.cooling_mode = 1;
1339
1340         /* Get default polling frequency [_TZP] (optional) */
1341         if (tzp)
1342                 tz->polling_frequency = tzp;
1343         else
1344                 acpi_thermal_get_polling_frequency(tz);
1345
1346         return 0;
1347 }
1348
1349 /*
1350  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1351  * handles temperature values with a single decimal place. As a consequence,
1352  * some implementations use an offset of 273.1 and others use an offset of
1353  * 273.2. Try to find out which one is being used, to present the most
1354  * accurate and visually appealing number.
1355  *
1356  * The heuristic below should work for all ACPI thermal zones which have a
1357  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1358  */
1359 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1360 {
1361         if (tz->trips.critical.flags.valid &&
1362             (tz->trips.critical.temperature % 5) == 1)
1363                 tz->kelvin_offset = 2731;
1364         else
1365                 tz->kelvin_offset = 2732;
1366 }
1367
1368 static int acpi_thermal_add(struct acpi_device *device)
1369 {
1370         int result = 0;
1371         struct acpi_thermal *tz = NULL;
1372
1373
1374         if (!device)
1375                 return -EINVAL;
1376
1377         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1378         if (!tz)
1379                 return -ENOMEM;
1380
1381         tz->device = device;
1382         strcpy(tz->name, device->pnp.bus_id);
1383         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1384         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1385         device->driver_data = tz;
1386         mutex_init(&tz->lock);
1387
1388
1389         result = acpi_thermal_get_info(tz);
1390         if (result)
1391                 goto free_memory;
1392
1393         acpi_thermal_guess_offset(tz);
1394
1395         result = acpi_thermal_register_thermal_zone(tz);
1396         if (result)
1397                 goto free_memory;
1398
1399         result = acpi_thermal_add_fs(device);
1400         if (result)
1401                 goto unregister_thermal_zone;
1402
1403         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1404                acpi_device_name(device), acpi_device_bid(device),
1405                KELVIN_TO_CELSIUS(tz->temperature));
1406         goto end;
1407
1408 unregister_thermal_zone:
1409         thermal_zone_device_unregister(tz->thermal_zone);
1410 free_memory:
1411         kfree(tz);
1412 end:
1413         return result;
1414 }
1415
1416 static int acpi_thermal_remove(struct acpi_device *device, int type)
1417 {
1418         struct acpi_thermal *tz = NULL;
1419
1420         if (!device || !acpi_driver_data(device))
1421                 return -EINVAL;
1422
1423         tz = acpi_driver_data(device);
1424
1425         acpi_thermal_remove_fs(device);
1426         acpi_thermal_unregister_thermal_zone(tz);
1427         mutex_destroy(&tz->lock);
1428         kfree(tz);
1429         return 0;
1430 }
1431
1432 static int acpi_thermal_resume(struct acpi_device *device)
1433 {
1434         struct acpi_thermal *tz = NULL;
1435         int i, j, power_state, result;
1436
1437
1438         if (!device || !acpi_driver_data(device))
1439                 return -EINVAL;
1440
1441         tz = acpi_driver_data(device);
1442
1443         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1444                 if (!(&tz->trips.active[i]))
1445                         break;
1446                 if (!tz->trips.active[i].flags.valid)
1447                         break;
1448                 tz->trips.active[i].flags.enabled = 1;
1449                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1450                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1451                             handles[j], &power_state);
1452                         if (result || (power_state != ACPI_STATE_D0)) {
1453                                 tz->trips.active[i].flags.enabled = 0;
1454                                 break;
1455                         }
1456                 }
1457                 tz->state.active |= tz->trips.active[i].flags.enabled;
1458         }
1459
1460         acpi_thermal_check(tz);
1461
1462         return AE_OK;
1463 }
1464
1465 static int thermal_act(const struct dmi_system_id *d) {
1466
1467         if (act == 0) {
1468                 printk(KERN_NOTICE "ACPI: %s detected: "
1469                         "disabling all active thermal trip points\n", d->ident);
1470                 act = -1;
1471         }
1472         return 0;
1473 }
1474 static int thermal_nocrt(const struct dmi_system_id *d) {
1475
1476         printk(KERN_NOTICE "ACPI: %s detected: "
1477                 "disabling all critical thermal trip point actions.\n", d->ident);
1478         nocrt = 1;
1479         return 0;
1480 }
1481 static int thermal_tzp(const struct dmi_system_id *d) {
1482
1483         if (tzp == 0) {
1484                 printk(KERN_NOTICE "ACPI: %s detected: "
1485                         "enabling thermal zone polling\n", d->ident);
1486                 tzp = 300;      /* 300 dS = 30 Seconds */
1487         }
1488         return 0;
1489 }
1490 static int thermal_psv(const struct dmi_system_id *d) {
1491
1492         if (psv == 0) {
1493                 printk(KERN_NOTICE "ACPI: %s detected: "
1494                         "disabling all passive thermal trip points\n", d->ident);
1495                 psv = -1;
1496         }
1497         return 0;
1498 }
1499
1500 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1501         /*
1502          * Award BIOS on this AOpen makes thermal control almost worthless.
1503          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1504          */
1505         {
1506          .callback = thermal_act,
1507          .ident = "AOpen i915GMm-HFS",
1508          .matches = {
1509                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1510                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1511                 },
1512         },
1513         {
1514          .callback = thermal_psv,
1515          .ident = "AOpen i915GMm-HFS",
1516          .matches = {
1517                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1518                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1519                 },
1520         },
1521         {
1522          .callback = thermal_tzp,
1523          .ident = "AOpen i915GMm-HFS",
1524          .matches = {
1525                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1526                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1527                 },
1528         },
1529         {
1530          .callback = thermal_nocrt,
1531          .ident = "Gigabyte GA-7ZX",
1532          .matches = {
1533                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1534                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1535                 },
1536         },
1537         {}
1538 };
1539
1540 static int __init acpi_thermal_init(void)
1541 {
1542         int result = 0;
1543
1544         dmi_check_system(thermal_dmi_table);
1545
1546         if (off) {
1547                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1548                 return -ENODEV;
1549         }
1550         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1551         if (!acpi_thermal_dir)
1552                 return -ENODEV;
1553
1554         result = acpi_bus_register_driver(&acpi_thermal_driver);
1555         if (result < 0) {
1556                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1557                 return -ENODEV;
1558         }
1559
1560         return 0;
1561 }
1562
1563 static void __exit acpi_thermal_exit(void)
1564 {
1565
1566         acpi_bus_unregister_driver(&acpi_thermal_driver);
1567
1568         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1569
1570         return;
1571 }
1572
1573 module_init(acpi_thermal_init);
1574 module_exit(acpi_thermal_exit);