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/slab.h>
  39 #include <linux/types.h>
  40
  41 #ifdef CONFIG_ACPI_PROCFS
  42 #include <linux/proc_fs.h>
  43 #include <linux/seq_file.h>
  44 #endif
  45
  46 #include <linux/jiffies.h>
  47 #include <linux/kmod.h>
  48 #include <linux/reboot.h>
  49 #include <linux/device.h>
  50 #include <asm/uaccess.h>
  51 #include <linux/thermal.h>
  52 #include <acpi/acpi_bus.h>
  53 #include <acpi/acpi_drivers.h>
  54
  55 #define PREFIX "ACPI: "
  56
  57 #define ACPI_THERMAL_CLASS              "thermal_zone"
  58 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  59 #define ACPI_THERMAL_FILE_STATE         "state"
  60 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  61 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  62 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  63 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  64 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  65 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  66 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  67 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  68 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  69 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  70
  71 #define ACPI_THERMAL_MAX_ACTIVE 10
  72 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  73
  74 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  75 ACPI_MODULE_NAME("thermal");
  76
  77 MODULE_AUTHOR("Paul Diefenbaugh");
  78 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  79 MODULE_LICENSE("GPL");
  80
  81 static int act;
  82 module_param(act, int, 0644);
  83 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  84
  85 static int crt;
  86 module_param(crt, int, 0644);
  87 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  88
  89 static int tzp;
  90 module_param(tzp, int, 0444);
  91 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  92
  93 static int nocrt;
  94 module_param(nocrt, int, 0);
  95 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  96
  97 static int off;
  98 module_param(off, int, 0);
  99 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
 100
 101 static int psv;
 102 module_param(psv, int, 0644);
 103 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 104
 105 static int acpi_thermal_add(struct acpi_device *device);
 106 static int acpi_thermal_remove(struct acpi_device *device, int type);
 107 static int acpi_thermal_resume(struct acpi_device *device);
 108 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 109
 110 static const struct acpi_device_id  thermal_device_ids[] = {
 111         {ACPI_THERMAL_HID, 0},
 112         {"", 0},
 113 };
 114 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 115
 116 static struct acpi_driver acpi_thermal_driver = {
 117         .name = "thermal",
 118         .class = ACPI_THERMAL_CLASS,
 119         .ids = thermal_device_ids,
 120         .ops = {
 121                 .add = acpi_thermal_add,
 122                 .remove = acpi_thermal_remove,
 123                 .resume = acpi_thermal_resume,
 124                 .notify = acpi_thermal_notify,
 125                 },
 126 };
 127
 128 struct acpi_thermal_state {
 129         u8 critical:1;
 130         u8 hot:1;
 131         u8 passive:1;
 132         u8 active:1;
 133         u8 reserved:4;
 134         int active_index;
 135 };
 136
 137 struct acpi_thermal_state_flags {
 138         u8 valid:1;
 139         u8 enabled:1;
 140         u8 reserved:6;
 141 };
 142
 143 struct acpi_thermal_critical {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146 };
 147
 148 struct acpi_thermal_hot {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_passive {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156         unsigned long tc1;
 157         unsigned long tc2;
 158         unsigned long tsp;
 159         struct acpi_handle_list devices;
 160 };
 161
 162 struct acpi_thermal_active {
 163         struct acpi_thermal_state_flags flags;
 164         unsigned long temperature;
 165         struct acpi_handle_list devices;
 166 };
 167
 168 struct acpi_thermal_trips {
 169         struct acpi_thermal_critical critical;
 170         struct acpi_thermal_hot hot;
 171         struct acpi_thermal_passive passive;
 172         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 173 };
 174
 175 struct acpi_thermal_flags {
 176         u8 cooling_mode:1;      /* _SCP */
 177         u8 devices:1;           /* _TZD */
 178         u8 reserved:6;
 179 };
 180
 181 struct acpi_thermal {
 182         struct acpi_device * device;
 183         acpi_bus_id name;
 184         unsigned long temperature;
 185         unsigned long last_temperature;
 186         unsigned long polling_frequency;
 187         volatile u8 zombie;
 188         struct acpi_thermal_flags flags;
 189         struct acpi_thermal_state state;
 190         struct acpi_thermal_trips trips;
 191         struct acpi_handle_list devices;
 192         struct thermal_zone_device *thermal_zone;
 193         int tz_enabled;
 194         int kelvin_offset;
 195         struct mutex lock;
 196 };
 197
 198 #ifdef CONFIG_ACPI_PROCFS
 199 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 200 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 201 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 202 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 203 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 204                                                const char __user *, size_t,
 205                                                loff_t *);
 206 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 207 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 208                                           size_t, loff_t *);
 209
 210 static const struct file_operations acpi_thermal_state_fops = {
 211         .owner = THIS_MODULE,
 212         .open = acpi_thermal_state_open_fs,
 213         .read = seq_read,
 214         .llseek = seq_lseek,
 215         .release = single_release,
 216 };
 217
 218 static const struct file_operations acpi_thermal_temp_fops = {
 219         .owner = THIS_MODULE,
 220         .open = acpi_thermal_temp_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static const struct file_operations acpi_thermal_trip_fops = {
 227         .owner = THIS_MODULE,
 228         .open = acpi_thermal_trip_open_fs,
 229         .read = seq_read,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 static const struct file_operations acpi_thermal_cooling_fops = {
 235         .owner = THIS_MODULE,
 236         .open = acpi_thermal_cooling_open_fs,
 237         .read = seq_read,
 238         .write = acpi_thermal_write_cooling_mode,
 239         .llseek = seq_lseek,
 240         .release = single_release,
 241 };
 242
 243 static const struct file_operations acpi_thermal_polling_fops = {
 244         .owner = THIS_MODULE,
 245         .open = acpi_thermal_polling_open_fs,
 246         .read = seq_read,
 247         .write = acpi_thermal_write_polling,
 248         .llseek = seq_lseek,
 249         .release = single_release,
 250 };
 251 #endif /* CONFIG_ACPI_PROCFS*/
 252
 253 /* --------------------------------------------------------------------------
 254                              Thermal Zone Management
 255    -------------------------------------------------------------------------- */
 256
 257 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 258 {
 259         acpi_status status = AE_OK;
 260         unsigned long long tmp;
 261
 262         if (!tz)
 263                 return -EINVAL;
 264
 265         tz->last_temperature = tz->temperature;
 266
 267         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 268         if (ACPI_FAILURE(status))
 269                 return -ENODEV;
 270
 271         tz->temperature = tmp;
 272         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 273                           tz->temperature));
 274
 275         return 0;
 276 }
 277
 278 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 279 {
 280         acpi_status status = AE_OK;
 281         unsigned long long tmp;
 282
 283         if (!tz)
 284                 return -EINVAL;
 285
 286         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 287         if (ACPI_FAILURE(status))
 288                 return -ENODEV;
 289
 290         tz->polling_frequency = tmp;
 291         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 292                           tz->polling_frequency));
 293
 294         return 0;
 295 }
 296
 297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 298 {
 299         acpi_status status = AE_OK;
 300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 301         struct acpi_object_list arg_list = { 1, &arg0 };
 302         acpi_handle handle = NULL;
 303
 304
 305         if (!tz)
 306                 return -EINVAL;
 307
 308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 309         if (ACPI_FAILURE(status)) {
 310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 311                 return -ENODEV;
 312         }
 313
 314         arg0.integer.value = mode;
 315
 316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 317         if (ACPI_FAILURE(status))
 318                 return -ENODEV;
 319
 320         return 0;
 321 }
 322
 323 #define ACPI_TRIPS_CRITICAL     0x01
 324 #define ACPI_TRIPS_HOT          0x02
 325 #define ACPI_TRIPS_PASSIVE      0x04
 326 #define ACPI_TRIPS_ACTIVE       0x08
 327 #define ACPI_TRIPS_DEVICES      0x10
 328
 329 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 330 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 331
 332 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 333                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 334                               ACPI_TRIPS_DEVICES)
 335
 336 /*
 337  * This exception is thrown out in two cases:
 338  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 339  *   when re-evaluating the AML code.
 340  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 341  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 342  */
 343 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 344 do {    \
 345         if (flags != ACPI_TRIPS_INIT)   \
 346                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 347                 "ACPI thermal trip point %s changed\n"  \
 348                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 349 } while (0)
 350
 351 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 352 {
 353         acpi_status status = AE_OK;
 354         unsigned long long tmp;
 355         struct acpi_handle_list devices;
 356         int valid = 0;
 357         int i;
 358
 359         /* Critical Shutdown */
 360         if (flag & ACPI_TRIPS_CRITICAL) {
 361                 status = acpi_evaluate_integer(tz->device->handle,
 362                                 "_CRT", NULL, &tmp);
 363                 tz->trips.critical.temperature = tmp;
 364                 /*
 365                  * Treat freezing temperatures as invalid as well; some
 366                  * BIOSes return really low values and cause reboots at startup.
 367                  * Below zero (Celsius) values clearly aren't right for sure..
 368                  * ... so lets discard those as invalid.
 369                  */
 370                 if (ACPI_FAILURE(status)) {
 371                         tz->trips.critical.flags.valid = 0;
 372                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 373                                           "No critical threshold\n"));
 374                 } else if (tmp <= 2732) {
 375                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 376                                "(%llu)\n", tmp);
 377                         tz->trips.critical.flags.valid = 0;
 378                 } else {
 379                         tz->trips.critical.flags.valid = 1;
 380                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 381                                           "Found critical threshold [%lu]\n",
 382                                           tz->trips.critical.temperature));
 383                 }
 384                 if (tz->trips.critical.flags.valid == 1) {
 385                         if (crt == -1) {
 386                                 tz->trips.critical.flags.valid = 0;
 387                         } else if (crt > 0) {
 388                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 389                                 /*
 390                                  * Allow override critical threshold
 391                                  */
 392                                 if (crt_k > tz->trips.critical.temperature)
 393                                         printk(KERN_WARNING PREFIX
 394                                                 "Critical threshold %d C\n", crt);
 395                                 tz->trips.critical.temperature = crt_k;
 396                         }
 397                 }
 398         }
 399
 400         /* Critical Sleep (optional) */
 401         if (flag & ACPI_TRIPS_HOT) {
 402                 status = acpi_evaluate_integer(tz->device->handle,
 403                                 "_HOT", NULL, &tmp);
 404                 if (ACPI_FAILURE(status)) {
 405                         tz->trips.hot.flags.valid = 0;
 406                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 407                                         "No hot threshold\n"));
 408                 } else {
 409                         tz->trips.hot.temperature = tmp;
 410                         tz->trips.hot.flags.valid = 1;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                         "Found hot threshold [%lu]\n",
 413                                         tz->trips.critical.temperature));
 414                 }
 415         }
 416
 417         /* Passive (optional) */
 418         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 419                 (flag == ACPI_TRIPS_INIT)) {
 420                 valid = tz->trips.passive.flags.valid;
 421                 if (psv == -1) {
 422                         status = AE_SUPPORT;
 423                 } else if (psv > 0) {
 424                         tmp = CELSIUS_TO_KELVIN(psv);
 425                         status = AE_OK;
 426                 } else {
 427                         status = acpi_evaluate_integer(tz->device->handle,
 428                                 "_PSV", NULL, &tmp);
 429                 }
 430
 431                 if (ACPI_FAILURE(status))
 432                         tz->trips.passive.flags.valid = 0;
 433                 else {
 434                         tz->trips.passive.temperature = tmp;
 435                         tz->trips.passive.flags.valid = 1;
 436                         if (flag == ACPI_TRIPS_INIT) {
 437                                 status = acpi_evaluate_integer(
 438                                                 tz->device->handle, "_TC1",
 439                                                 NULL, &tmp);
 440                                 if (ACPI_FAILURE(status))
 441                                         tz->trips.passive.flags.valid = 0;
 442                                 else
 443                                         tz->trips.passive.tc1 = tmp;
 444                                 status = acpi_evaluate_integer(
 445                                                 tz->device->handle, "_TC2",
 446                                                 NULL, &tmp);
 447                                 if (ACPI_FAILURE(status))
 448                                         tz->trips.passive.flags.valid = 0;
 449                                 else
 450                                         tz->trips.passive.tc2 = tmp;
 451                                 status = acpi_evaluate_integer(
 452                                                 tz->device->handle, "_TSP",
 453                                                 NULL, &tmp);
 454                                 if (ACPI_FAILURE(status))
 455                                         tz->trips.passive.flags.valid = 0;
 456                                 else
 457                                         tz->trips.passive.tsp = tmp;
 458                         }
 459                 }
 460         }
 461         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 462                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 463                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 464                                                         NULL, &devices);
 465                 if (ACPI_FAILURE(status)) {
 466                         printk(KERN_WARNING PREFIX
 467                                 "Invalid passive threshold\n");
 468                         tz->trips.passive.flags.valid = 0;
 469                 }
 470                 else
 471                         tz->trips.passive.flags.valid = 1;
 472
 473                 if (memcmp(&tz->trips.passive.devices, &devices,
 474                                 sizeof(struct acpi_handle_list))) {
 475                         memcpy(&tz->trips.passive.devices, &devices,
 476                                 sizeof(struct acpi_handle_list));
 477                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 478                 }
 479         }
 480         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 481                 if (valid != tz->trips.passive.flags.valid)
 482                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 483         }
 484
 485         /* Active (optional) */
 486         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 487                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 488                 valid = tz->trips.active[i].flags.valid;
 489
 490                 if (act == -1)
 491                         break; /* disable all active trip points */
 492
 493                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 494                         tz->trips.active[i].flags.valid)) {
 495                         status = acpi_evaluate_integer(tz->device->handle,
 496                                                         name, NULL, &tmp);
 497                         if (ACPI_FAILURE(status)) {
 498                                 tz->trips.active[i].flags.valid = 0;
 499                                 if (i == 0)
 500                                         break;
 501                                 if (act <= 0)
 502                                         break;
 503                                 if (i == 1)
 504                                         tz->trips.active[0].temperature =
 505                                                 CELSIUS_TO_KELVIN(act);
 506                                 else
 507                                         /*
 508                                          * Don't allow override higher than
 509                                          * the next higher trip point
 510                                          */
 511                                         tz->trips.active[i - 1].temperature =
 512                                                 (tz->trips.active[i - 2].temperature <
 513                                                 CELSIUS_TO_KELVIN(act) ?
 514                                                 tz->trips.active[i - 2].temperature :
 515                                                 CELSIUS_TO_KELVIN(act));
 516                                 break;
 517                         } else {
 518                                 tz->trips.active[i].temperature = tmp;
 519                                 tz->trips.active[i].flags.valid = 1;
 520                         }
 521                 }
 522
 523                 name[2] = 'L';
 524                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 525                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 526                         status = acpi_evaluate_reference(tz->device->handle,
 527                                                 name, NULL, &devices);
 528                         if (ACPI_FAILURE(status)) {
 529                                 printk(KERN_WARNING PREFIX
 530                                         "Invalid active%d threshold\n", i);
 531                                 tz->trips.active[i].flags.valid = 0;
 532                         }
 533                         else
 534                                 tz->trips.active[i].flags.valid = 1;
 535
 536                         if (memcmp(&tz->trips.active[i].devices, &devices,
 537                                         sizeof(struct acpi_handle_list))) {
 538                                 memcpy(&tz->trips.active[i].devices, &devices,
 539                                         sizeof(struct acpi_handle_list));
 540                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 541                         }
 542                 }
 543                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 544                         if (valid != tz->trips.active[i].flags.valid)
 545                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 546
 547                 if (!tz->trips.active[i].flags.valid)
 548                         break;
 549         }
 550
 551         if (flag & ACPI_TRIPS_DEVICES) {
 552                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 553                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 554                                                 NULL, &devices);
 555                 if (memcmp(&tz->devices, &devices,
 556                                 sizeof(struct acpi_handle_list))) {
 557                         memcpy(&tz->devices, &devices,
 558                                 sizeof(struct acpi_handle_list));
 559                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 560                 }
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 567 {
 568         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 569
 570         if (ret)
 571                 return ret;
 572
 573         valid = tz->trips.critical.flags.valid |
 574                 tz->trips.hot.flags.valid |
 575                 tz->trips.passive.flags.valid;
 576
 577         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 578                 valid |= tz->trips.active[i].flags.valid;
 579
 580         if (!valid) {
 581                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 582                 return -ENODEV;
 583         }
 584         return 0;
 585 }
 586
 587 static void acpi_thermal_check(void *data)
 588 {
 589         struct acpi_thermal *tz = data;
 590
 591         thermal_zone_device_update(tz->thermal_zone);
 592 }
 593
 594 /* sys I/F for generic thermal sysfs support */
 595 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 596
 597 static int thermal_get_temp(struct thermal_zone_device *thermal,
 598                             unsigned long *temp)
 599 {
 600         struct acpi_thermal *tz = thermal->devdata;
 601         int result;
 602
 603         if (!tz)
 604                 return -EINVAL;
 605
 606         result = acpi_thermal_get_temperature(tz);
 607         if (result)
 608                 return result;
 609
 610         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 611         return 0;
 612 }
 613
 614 static const char enabled[] = "kernel";
 615 static const char disabled[] = "user";
 616 static int thermal_get_mode(struct thermal_zone_device *thermal,
 617                                 enum thermal_device_mode *mode)
 618 {
 619         struct acpi_thermal *tz = thermal->devdata;
 620
 621         if (!tz)
 622                 return -EINVAL;
 623
 624         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 625                 THERMAL_DEVICE_DISABLED;
 626
 627         return 0;
 628 }
 629
 630 static int thermal_set_mode(struct thermal_zone_device *thermal,
 631                                 enum thermal_device_mode mode)
 632 {
 633         struct acpi_thermal *tz = thermal->devdata;
 634         int enable;
 635
 636         if (!tz)
 637                 return -EINVAL;
 638
 639         /*
 640          * enable/disable thermal management from ACPI thermal driver
 641          */
 642         if (mode == THERMAL_DEVICE_ENABLED)
 643                 enable = 1;
 644         else if (mode == THERMAL_DEVICE_DISABLED)
 645                 enable = 0;
 646         else
 647                 return -EINVAL;
 648
 649         if (enable != tz->tz_enabled) {
 650                 tz->tz_enabled = enable;
 651                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 652                         "%s ACPI thermal control\n",
 653                         tz->tz_enabled ? enabled : disabled));
 654                 acpi_thermal_check(tz);
 655         }
 656         return 0;
 657 }
 658
 659 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 660                                  int trip, enum thermal_trip_type *type)
 661 {
 662         struct acpi_thermal *tz = thermal->devdata;
 663         int i;
 664
 665         if (!tz || trip < 0)
 666                 return -EINVAL;
 667
 668         if (tz->trips.critical.flags.valid) {
 669                 if (!trip) {
 670                         *type = THERMAL_TRIP_CRITICAL;
 671                         return 0;
 672                 }
 673                 trip--;
 674         }
 675
 676         if (tz->trips.hot.flags.valid) {
 677                 if (!trip) {
 678                         *type = THERMAL_TRIP_HOT;
 679                         return 0;
 680                 }
 681                 trip--;
 682         }
 683
 684         if (tz->trips.passive.flags.valid) {
 685                 if (!trip) {
 686                         *type = THERMAL_TRIP_PASSIVE;
 687                         return 0;
 688                 }
 689                 trip--;
 690         }
 691
 692         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 693                 tz->trips.active[i].flags.valid; i++) {
 694                 if (!trip) {
 695                         *type = THERMAL_TRIP_ACTIVE;
 696                         return 0;
 697                 }
 698                 trip--;
 699         }
 700
 701         return -EINVAL;
 702 }
 703
 704 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 705                                  int trip, unsigned long *temp)
 706 {
 707         struct acpi_thermal *tz = thermal->devdata;
 708         int i;
 709
 710         if (!tz || trip < 0)
 711                 return -EINVAL;
 712
 713         if (tz->trips.critical.flags.valid) {
 714                 if (!trip) {
 715                         *temp = KELVIN_TO_MILLICELSIUS(
 716                                 tz->trips.critical.temperature,
 717                                 tz->kelvin_offset);
 718                         return 0;
 719                 }
 720                 trip--;
 721         }
 722
 723         if (tz->trips.hot.flags.valid) {
 724                 if (!trip) {
 725                         *temp = KELVIN_TO_MILLICELSIUS(
 726                                 tz->trips.hot.temperature,
 727                                 tz->kelvin_offset);
 728                         return 0;
 729                 }
 730                 trip--;
 731         }
 732
 733         if (tz->trips.passive.flags.valid) {
 734                 if (!trip) {
 735                         *temp = KELVIN_TO_MILLICELSIUS(
 736                                 tz->trips.passive.temperature,
 737                                 tz->kelvin_offset);
 738                         return 0;
 739                 }
 740                 trip--;
 741         }
 742
 743         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 744                 tz->trips.active[i].flags.valid; i++) {
 745                 if (!trip) {
 746                         *temp = KELVIN_TO_MILLICELSIUS(
 747                                 tz->trips.active[i].temperature,
 748                                 tz->kelvin_offset);
 749                         return 0;
 750                 }
 751                 trip--;
 752         }
 753
 754         return -EINVAL;
 755 }
 756
 757 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 758                                 unsigned long *temperature) {
 759         struct acpi_thermal *tz = thermal->devdata;
 760
 761         if (tz->trips.critical.flags.valid) {
 762                 *temperature = KELVIN_TO_MILLICELSIUS(
 763                                 tz->trips.critical.temperature,
 764                                 tz->kelvin_offset);
 765                 return 0;
 766         } else
 767                 return -EINVAL;
 768 }
 769
 770 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 771                            enum thermal_trip_type trip_type)
 772 {
 773         u8 type = 0;
 774         struct acpi_thermal *tz = thermal->devdata;
 775
 776         if (trip_type == THERMAL_TRIP_CRITICAL)
 777                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 778         else if (trip_type == THERMAL_TRIP_HOT)
 779                 type = ACPI_THERMAL_NOTIFY_HOT;
 780         else
 781                 return 0;
 782
 783         acpi_bus_generate_proc_event(tz->device, type, 1);
 784         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 785                                         dev_name(&tz->device->dev), type, 1);
 786
 787         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 788                 return 1;
 789
 790         return 0;
 791 }
 792
 793 typedef int (*cb)(struct thermal_zone_device *, int,
 794                   struct thermal_cooling_device *);
 795 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 796                                         struct thermal_cooling_device *cdev,
 797                                         cb action)
 798 {
 799         struct acpi_device *device = cdev->devdata;
 800         struct acpi_thermal *tz = thermal->devdata;
 801         struct acpi_device *dev;
 802         acpi_status status;
 803         acpi_handle handle;
 804         int i;
 805         int j;
 806         int trip = -1;
 807         int result = 0;
 808
 809         if (tz->trips.critical.flags.valid)
 810                 trip++;
 811
 812         if (tz->trips.hot.flags.valid)
 813                 trip++;
 814
 815         if (tz->trips.passive.flags.valid) {
 816                 trip++;
 817                 for (i = 0; i < tz->trips.passive.devices.count;
 818                     i++) {
 819                         handle = tz->trips.passive.devices.handles[i];
 820                         status = acpi_bus_get_device(handle, &dev);
 821                         if (ACPI_SUCCESS(status) && (dev == device)) {
 822                                 result = action(thermal, trip, cdev);
 823                                 if (result)
 824                                         goto failed;
 825                         }
 826                 }
 827         }
 828
 829         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 830                 if (!tz->trips.active[i].flags.valid)
 831                         break;
 832                 trip++;
 833                 for (j = 0;
 834                     j < tz->trips.active[i].devices.count;
 835                     j++) {
 836                         handle = tz->trips.active[i].devices.handles[j];
 837                         status = acpi_bus_get_device(handle, &dev);
 838                         if (ACPI_SUCCESS(status) && (dev == device)) {
 839                                 result = action(thermal, trip, cdev);
 840                                 if (result)
 841                                         goto failed;
 842                         }
 843                 }
 844         }
 845
 846         for (i = 0; i < tz->devices.count; i++) {
 847                 handle = tz->devices.handles[i];
 848                 status = acpi_bus_get_device(handle, &dev);
 849                 if (ACPI_SUCCESS(status) && (dev == device)) {
 850                         result = action(thermal, -1, cdev);
 851                         if (result)
 852                                 goto failed;
 853                 }
 854         }
 855
 856 failed:
 857         return result;
 858 }
 859
 860 static int
 861 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 862                                         struct thermal_cooling_device *cdev)
 863 {
 864         return acpi_thermal_cooling_device_cb(thermal, cdev,
 865                                 thermal_zone_bind_cooling_device);
 866 }
 867
 868 static int
 869 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 870                                         struct thermal_cooling_device *cdev)
 871 {
 872         return acpi_thermal_cooling_device_cb(thermal, cdev,
 873                                 thermal_zone_unbind_cooling_device);
 874 }
 875
 876 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 877         .bind = acpi_thermal_bind_cooling_device,
 878         .unbind = acpi_thermal_unbind_cooling_device,
 879         .get_temp = thermal_get_temp,
 880         .get_mode = thermal_get_mode,
 881         .set_mode = thermal_set_mode,
 882         .get_trip_type = thermal_get_trip_type,
 883         .get_trip_temp = thermal_get_trip_temp,
 884         .get_crit_temp = thermal_get_crit_temp,
 885         .notify = thermal_notify,
 886 };
 887
 888 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 889 {
 890         int trips = 0;
 891         int result;
 892         acpi_status status;
 893         int i;
 894
 895         if (tz->trips.critical.flags.valid)
 896                 trips++;
 897
 898         if (tz->trips.hot.flags.valid)
 899                 trips++;
 900
 901         if (tz->trips.passive.flags.valid)
 902                 trips++;
 903
 904         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 905                         tz->trips.active[i].flags.valid; i++, trips++);
 906
 907         if (tz->trips.passive.flags.valid)
 908                 tz->thermal_zone =
 909                         thermal_zone_device_register("acpitz", trips, tz,
 910                                                      &acpi_thermal_zone_ops,
 911                                                      tz->trips.passive.tc1,
 912                                                      tz->trips.passive.tc2,
 913                                                      tz->trips.passive.tsp*100,
 914                                                      tz->polling_frequency*100);
 915         else
 916                 tz->thermal_zone =
 917                         thermal_zone_device_register("acpitz", trips, tz,
 918                                                      &acpi_thermal_zone_ops,
 919                                                      0, 0, 0,
 920                                                      tz->polling_frequency*100);
 921         if (IS_ERR(tz->thermal_zone))
 922                 return -ENODEV;
 923
 924         result = sysfs_create_link(&tz->device->dev.kobj,
 925                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 926         if (result)
 927                 return result;
 928
 929         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 930                                    &tz->device->dev.kobj, "device");
 931         if (result)
 932                 return result;
 933
 934         status = acpi_attach_data(tz->device->handle,
 935                                   acpi_bus_private_data_handler,
 936                                   tz->thermal_zone);
 937         if (ACPI_FAILURE(status)) {
 938                 printk(KERN_ERR PREFIX
 939                                 "Error attaching device data\n");
 940                 return -ENODEV;
 941         }
 942
 943         tz->tz_enabled = 1;
 944
 945         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 946                  tz->thermal_zone->id);
 947         return 0;
 948 }
 949
 950 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 951 {
 952         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 953         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 954         thermal_zone_device_unregister(tz->thermal_zone);
 955         tz->thermal_zone = NULL;
 956         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 957 }
 958
 959
 960 /* --------------------------------------------------------------------------
 961                               FS Interface (/proc)
 962    -------------------------------------------------------------------------- */
 963 #ifdef CONFIG_ACPI_PROCFS
 964 static struct proc_dir_entry *acpi_thermal_dir;
 965
 966 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 967 {
 968         struct acpi_thermal *tz = seq->private;
 969
 970
 971         if (!tz)
 972                 goto end;
 973
 974         seq_puts(seq, "state:                   ");
 975
 976         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 977             && !tz->state.active)
 978                 seq_puts(seq, "ok\n");
 979         else {
 980                 if (tz->state.critical)
 981                         seq_puts(seq, "critical ");
 982                 if (tz->state.hot)
 983                         seq_puts(seq, "hot ");
 984                 if (tz->state.passive)
 985                         seq_puts(seq, "passive ");
 986                 if (tz->state.active)
 987                         seq_printf(seq, "active[%d]", tz->state.active_index);
 988                 seq_puts(seq, "\n");
 989         }
 990
 991       end:
 992         return 0;
 993 }
 994
 995 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 996 {
 997         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 998 }
 999
1000 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1001 {
1002         int result = 0;
1003         struct acpi_thermal *tz = seq->private;
1004
1005
1006         if (!tz)
1007                 goto end;
1008
1009         result = acpi_thermal_get_temperature(tz);
1010         if (result)
1011                 goto end;
1012
1013         seq_printf(seq, "temperature:             %ld C\n",
1014                    KELVIN_TO_CELSIUS(tz->temperature));
1015
1016       end:
1017         return 0;
1018 }
1019
1020 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1021 {
1022         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1023 }
1024
1025 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1026 {
1027         struct acpi_thermal *tz = seq->private;
1028         struct acpi_device *device;
1029         acpi_status status;
1030
1031         int i = 0;
1032         int j = 0;
1033
1034
1035         if (!tz)
1036                 goto end;
1037
1038         if (tz->trips.critical.flags.valid)
1039                 seq_printf(seq, "critical (S5):           %ld C%s",
1040                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1041                            nocrt ? " <disabled>\n" : "\n");
1042
1043         if (tz->trips.hot.flags.valid)
1044                 seq_printf(seq, "hot (S4):                %ld C%s",
1045                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1046                            nocrt ? " <disabled>\n" : "\n");
1047
1048         if (tz->trips.passive.flags.valid) {
1049                 seq_printf(seq,
1050                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1051                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1052                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1053                            tz->trips.passive.tsp);
1054                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1055                         status = acpi_bus_get_device(tz->trips.passive.devices.
1056                                                      handles[j], &device);
1057                         seq_printf(seq, "%4.4s ", status ? "" :
1058                                    acpi_device_bid(device));
1059                 }
1060                 seq_puts(seq, "\n");
1061         } else {
1062                 seq_printf(seq, "passive (forced):");
1063                 if (tz->thermal_zone->forced_passive)
1064                         seq_printf(seq, "        %i C\n",
1065                                    tz->thermal_zone->forced_passive / 1000);
1066                 else
1067                         seq_printf(seq, "<not set>\n");
1068         }
1069
1070         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1071                 if (!(tz->trips.active[i].flags.valid))
1072                         break;
1073                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1074                            i,
1075                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1076                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1077                         status = acpi_bus_get_device(tz->trips.active[i].
1078                                                      devices.handles[j],
1079                                                      &device);
1080                         seq_printf(seq, "%4.4s ", status ? "" :
1081                                    acpi_device_bid(device));
1082                 }
1083                 seq_puts(seq, "\n");
1084         }
1085
1086       end:
1087         return 0;
1088 }
1089
1090 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1091 {
1092         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1093 }
1094
1095 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1096 {
1097         struct acpi_thermal *tz = seq->private;
1098
1099
1100         if (!tz)
1101                 goto end;
1102
1103         if (!tz->flags.cooling_mode)
1104                 seq_puts(seq, "<setting not supported>\n");
1105         else
1106                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1107
1108       end:
1109         return 0;
1110 }
1111
1112 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1113 {
1114         return single_open(file, acpi_thermal_cooling_seq_show,
1115                            PDE(inode)->data);
1116 }
1117
1118 static ssize_t
1119 acpi_thermal_write_cooling_mode(struct file *file,
1120                                 const char __user * buffer,
1121                                 size_t count, loff_t * ppos)
1122 {
1123         struct seq_file *m = file->private_data;
1124         struct acpi_thermal *tz = m->private;
1125         int result = 0;
1126         char mode_string[12] = { '\0' };
1127
1128
1129         if (!tz || (count > sizeof(mode_string) - 1))
1130                 return -EINVAL;
1131
1132         if (!tz->flags.cooling_mode)
1133                 return -ENODEV;
1134
1135         if (copy_from_user(mode_string, buffer, count))
1136                 return -EFAULT;
1137
1138         mode_string[count] = '\0';
1139
1140         result = acpi_thermal_set_cooling_mode(tz,
1141                                                simple_strtoul(mode_string, NULL,
1142                                                               0));
1143         if (result)
1144                 return result;
1145
1146         acpi_thermal_check(tz);
1147
1148         return count;
1149 }
1150
1151 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1152 {
1153         struct acpi_thermal *tz = seq->private;
1154
1155
1156         if (!tz)
1157                 goto end;
1158
1159         if (!tz->thermal_zone->polling_delay) {
1160                 seq_puts(seq, "<polling disabled>\n");
1161                 goto end;
1162         }
1163
1164         seq_printf(seq, "polling frequency:       %d seconds\n",
1165                    (tz->thermal_zone->polling_delay / 1000));
1166
1167       end:
1168         return 0;
1169 }
1170
1171 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1172 {
1173         return single_open(file, acpi_thermal_polling_seq_show,
1174                            PDE(inode)->data);
1175 }
1176
1177 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
1178 {
1179         if (!tz)
1180                 return -EINVAL;
1181
1182         /* Convert value to deci-seconds */
1183         tz->polling_frequency = seconds * 10;
1184
1185         tz->thermal_zone->polling_delay = seconds * 1000;
1186
1187         if (tz->tz_enabled)
1188                 thermal_zone_device_update(tz->thermal_zone);
1189
1190         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1191                           "Polling frequency set to %lu seconds\n",
1192                           tz->polling_frequency/10));
1193
1194         return 0;
1195 }
1196
1197 static ssize_t
1198 acpi_thermal_write_polling(struct file *file,
1199                            const char __user * buffer,
1200                            size_t count, loff_t * ppos)
1201 {
1202         struct seq_file *m = file->private_data;
1203         struct acpi_thermal *tz = m->private;
1204         int result = 0;
1205         char polling_string[12] = { '\0' };
1206         int seconds = 0;
1207
1208
1209         if (!tz || (count > sizeof(polling_string) - 1))
1210                 return -EINVAL;
1211
1212         if (copy_from_user(polling_string, buffer, count))
1213                 return -EFAULT;
1214
1215         polling_string[count] = '\0';
1216
1217         seconds = simple_strtoul(polling_string, NULL, 0);
1218
1219         result = acpi_thermal_set_polling(tz, seconds);
1220         if (result)
1221                 return result;
1222
1223         acpi_thermal_check(tz);
1224
1225         return count;
1226 }
1227
1228 static int acpi_thermal_add_fs(struct acpi_device *device)
1229 {
1230         struct proc_dir_entry *entry = NULL;
1231
1232
1233         if (!acpi_device_dir(device)) {
1234                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1235                                                      acpi_thermal_dir);
1236                 if (!acpi_device_dir(device))
1237                         return -ENODEV;
1238         }
1239
1240         /* 'state' [R] */
1241         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1242                                  S_IRUGO, acpi_device_dir(device),
1243                                  &acpi_thermal_state_fops,
1244                                  acpi_driver_data(device));
1245         if (!entry)
1246                 return -ENODEV;
1247
1248         /* 'temperature' [R] */
1249         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1250                                  S_IRUGO, acpi_device_dir(device),
1251                                  &acpi_thermal_temp_fops,
1252                                  acpi_driver_data(device));
1253         if (!entry)
1254                 return -ENODEV;
1255
1256         /* 'trip_points' [R] */
1257         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1258                                  S_IRUGO,
1259                                  acpi_device_dir(device),
1260                                  &acpi_thermal_trip_fops,
1261                                  acpi_driver_data(device));
1262         if (!entry)
1263                 return -ENODEV;
1264
1265         /* 'cooling_mode' [R/W] */
1266         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1267                                  S_IFREG | S_IRUGO | S_IWUSR,
1268                                  acpi_device_dir(device),
1269                                  &acpi_thermal_cooling_fops,
1270                                  acpi_driver_data(device));
1271         if (!entry)
1272                 return -ENODEV;
1273
1274         /* 'polling_frequency' [R/W] */
1275         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1276                                  S_IFREG | S_IRUGO | S_IWUSR,
1277                                  acpi_device_dir(device),
1278                                  &acpi_thermal_polling_fops,
1279                                  acpi_driver_data(device));
1280         if (!entry)
1281                 return -ENODEV;
1282         return 0;
1283 }
1284
1285 static int acpi_thermal_remove_fs(struct acpi_device *device)
1286 {
1287
1288         if (acpi_device_dir(device)) {
1289                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1290                                   acpi_device_dir(device));
1291                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1292                                   acpi_device_dir(device));
1293                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1294                                   acpi_device_dir(device));
1295                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1296                                   acpi_device_dir(device));
1297                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1298                                   acpi_device_dir(device));
1299                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1300                 acpi_device_dir(device) = NULL;
1301         }
1302
1303         return 0;
1304 }
1305 #else
1306 static inline int acpi_thermal_add_fs(struct acpi_device *device) { return 0; }
1307 static inline int acpi_thermal_remove_fs(struct acpi_device *device)
1308 {
1309         return 0;
1310 }
1311 #endif /* CONFIG_ACPI_PROCFS */
1312 /* --------------------------------------------------------------------------
1313                                  Driver Interface
1314    -------------------------------------------------------------------------- */
1315
1316 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1317 {
1318         struct acpi_thermal *tz = acpi_driver_data(device);
1319
1320
1321         if (!tz)
1322                 return;
1323
1324         switch (event) {
1325         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1326                 acpi_thermal_check(tz);
1327                 break;
1328         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1329                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1330                 acpi_thermal_check(tz);
1331                 acpi_bus_generate_proc_event(device, event, 0);
1332                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1333                                                   dev_name(&device->dev), event, 0);
1334                 break;
1335         case ACPI_THERMAL_NOTIFY_DEVICES:
1336                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1337                 acpi_thermal_check(tz);
1338                 acpi_bus_generate_proc_event(device, event, 0);
1339                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1340                                                   dev_name(&device->dev), event, 0);
1341                 break;
1342         default:
1343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1344                                   "Unsupported event [0x%x]\n", event));
1345                 break;
1346         }
1347 }
1348
1349 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1350 {
1351         int result = 0;
1352
1353
1354         if (!tz)
1355                 return -EINVAL;
1356
1357         /* Get temperature [_TMP] (required) */
1358         result = acpi_thermal_get_temperature(tz);
1359         if (result)
1360                 return result;
1361
1362         /* Get trip points [_CRT, _PSV, etc.] (required) */
1363         result = acpi_thermal_get_trip_points(tz);
1364         if (result)
1365                 return result;
1366
1367         /* Set the cooling mode [_SCP] to active cooling (default) */
1368         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1369         if (!result)
1370                 tz->flags.cooling_mode = 1;
1371
1372         /* Get default polling frequency [_TZP] (optional) */
1373         if (tzp)
1374                 tz->polling_frequency = tzp;
1375         else
1376                 acpi_thermal_get_polling_frequency(tz);
1377
1378         return 0;
1379 }
1380
1381 /*
1382  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1383  * handles temperature values with a single decimal place. As a consequence,
1384  * some implementations use an offset of 273.1 and others use an offset of
1385  * 273.2. Try to find out which one is being used, to present the most
1386  * accurate and visually appealing number.
1387  *
1388  * The heuristic below should work for all ACPI thermal zones which have a
1389  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1390  */
1391 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1392 {
1393         if (tz->trips.critical.flags.valid &&
1394             (tz->trips.critical.temperature % 5) == 1)
1395                 tz->kelvin_offset = 2731;
1396         else
1397                 tz->kelvin_offset = 2732;
1398 }
1399
1400 static int acpi_thermal_add(struct acpi_device *device)
1401 {
1402         int result = 0;
1403         struct acpi_thermal *tz = NULL;
1404
1405
1406         if (!device)
1407                 return -EINVAL;
1408
1409         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1410         if (!tz)
1411                 return -ENOMEM;
1412
1413         tz->device = device;
1414         strcpy(tz->name, device->pnp.bus_id);
1415         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1416         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1417         device->driver_data = tz;
1418         mutex_init(&tz->lock);
1419
1420
1421         result = acpi_thermal_get_info(tz);
1422         if (result)
1423                 goto free_memory;
1424
1425         acpi_thermal_guess_offset(tz);
1426
1427         result = acpi_thermal_register_thermal_zone(tz);
1428         if (result)
1429                 goto free_memory;
1430
1431         result = acpi_thermal_add_fs(device);
1432         if (result)
1433                 goto unregister_thermal_zone;
1434
1435         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1436                acpi_device_name(device), acpi_device_bid(device),
1437                KELVIN_TO_CELSIUS(tz->temperature));
1438         goto end;
1439
1440 unregister_thermal_zone:
1441         thermal_zone_device_unregister(tz->thermal_zone);
1442 free_memory:
1443         kfree(tz);
1444 end:
1445         return result;
1446 }
1447
1448 static int acpi_thermal_remove(struct acpi_device *device, int type)
1449 {
1450         struct acpi_thermal *tz = NULL;
1451
1452         if (!device || !acpi_driver_data(device))
1453                 return -EINVAL;
1454
1455         tz = acpi_driver_data(device);
1456
1457         acpi_thermal_remove_fs(device);
1458         acpi_thermal_unregister_thermal_zone(tz);
1459         mutex_destroy(&tz->lock);
1460         kfree(tz);
1461         return 0;
1462 }
1463
1464 static int acpi_thermal_resume(struct acpi_device *device)
1465 {
1466         struct acpi_thermal *tz = NULL;
1467         int i, j, power_state, result;
1468
1469
1470         if (!device || !acpi_driver_data(device))
1471                 return -EINVAL;
1472
1473         tz = acpi_driver_data(device);
1474
1475         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1476                 if (!(&tz->trips.active[i]))
1477                         break;
1478                 if (!tz->trips.active[i].flags.valid)
1479                         break;
1480                 tz->trips.active[i].flags.enabled = 1;
1481                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1482                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1483                             handles[j], &power_state);
1484                         if (result || (power_state != ACPI_STATE_D0)) {
1485                                 tz->trips.active[i].flags.enabled = 0;
1486                                 break;
1487                         }
1488                 }
1489                 tz->state.active |= tz->trips.active[i].flags.enabled;
1490         }
1491
1492         acpi_thermal_check(tz);
1493
1494         return AE_OK;
1495 }
1496
1497 static int thermal_act(const struct dmi_system_id *d) {
1498
1499         if (act == 0) {
1500                 printk(KERN_NOTICE "ACPI: %s detected: "
1501                         "disabling all active thermal trip points\n", d->ident);
1502                 act = -1;
1503         }
1504         return 0;
1505 }
1506 static int thermal_nocrt(const struct dmi_system_id *d) {
1507
1508         printk(KERN_NOTICE "ACPI: %s detected: "
1509                 "disabling all critical thermal trip point actions.\n", d->ident);
1510         nocrt = 1;
1511         return 0;
1512 }
1513 static int thermal_tzp(const struct dmi_system_id *d) {
1514
1515         if (tzp == 0) {
1516                 printk(KERN_NOTICE "ACPI: %s detected: "
1517                         "enabling thermal zone polling\n", d->ident);
1518                 tzp = 300;      /* 300 dS = 30 Seconds */
1519         }
1520         return 0;
1521 }
1522 static int thermal_psv(const struct dmi_system_id *d) {
1523
1524         if (psv == 0) {
1525                 printk(KERN_NOTICE "ACPI: %s detected: "
1526                         "disabling all passive thermal trip points\n", d->ident);
1527                 psv = -1;
1528         }
1529         return 0;
1530 }
1531
1532 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1533         /*
1534          * Award BIOS on this AOpen makes thermal control almost worthless.
1535          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1536          */
1537         {
1538          .callback = thermal_act,
1539          .ident = "AOpen i915GMm-HFS",
1540          .matches = {
1541                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1542                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1543                 },
1544         },
1545         {
1546          .callback = thermal_psv,
1547          .ident = "AOpen i915GMm-HFS",
1548          .matches = {
1549                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1550                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1551                 },
1552         },
1553         {
1554          .callback = thermal_tzp,
1555          .ident = "AOpen i915GMm-HFS",
1556          .matches = {
1557                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1558                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1559                 },
1560         },
1561         {
1562          .callback = thermal_nocrt,
1563          .ident = "Gigabyte GA-7ZX",
1564          .matches = {
1565                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1566                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1567                 },
1568         },
1569         {}
1570 };
1571
1572 static int __init acpi_thermal_init(void)
1573 {
1574         int result = 0;
1575
1576         dmi_check_system(thermal_dmi_table);
1577
1578         if (off) {
1579                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1580                 return -ENODEV;
1581         }
1582
1583 #ifdef CONFIG_ACPI_PROCFS
1584         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1585         if (!acpi_thermal_dir)
1586                 return -ENODEV;
1587 #endif
1588
1589         result = acpi_bus_register_driver(&acpi_thermal_driver);
1590         if (result < 0) {
1591 #ifdef CONFIG_ACPI_PROCFS
1592                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1593 #endif
1594                 return -ENODEV;
1595         }
1596
1597         return 0;
1598 }
1599
1600 static void __exit acpi_thermal_exit(void)
1601 {
1602
1603         acpi_bus_unregister_driver(&acpi_thermal_driver);
1604
1605 #ifdef CONFIG_ACPI_PROCFS
1606         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1607 #endif
1608
1609         return;
1610 }
1611
1612 module_init(acpi_thermal_init);
1613 module_exit(acpi_thermal_exit);