drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <linux/device.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/thermal.h>
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  68 ACPI_MODULE_NAME("thermal");
  69
  70 MODULE_AUTHOR("Paul Diefenbaugh");
  71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int act;
  75 module_param(act, int, 0644);
  76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  77
  78 static int crt;
  79 module_param(crt, int, 0644);
  80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  81
  82 static int tzp;
  83 module_param(tzp, int, 0444);
  84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  85
  86 static int nocrt;
  87 module_param(nocrt, int, 0);
  88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  89
  90 static int off;
  91 module_param(off, int, 0);
  92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  93
  94 static int psv;
  95 module_param(psv, int, 0644);
  96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  97
  98 static int acpi_thermal_add(struct acpi_device *device);
  99 static int acpi_thermal_remove(struct acpi_device *device, int type);
 100 static int acpi_thermal_resume(struct acpi_device *device);
 101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 106                                                const char __user *, size_t,
 107                                                loff_t *);
 108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 110                                           size_t, loff_t *);
 111
 112 static const struct acpi_device_id  thermal_device_ids[] = {
 113         {ACPI_THERMAL_HID, 0},
 114         {"", 0},
 115 };
 116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 117
 118 static struct acpi_driver acpi_thermal_driver = {
 119         .name = "thermal",
 120         .class = ACPI_THERMAL_CLASS,
 121         .ids = thermal_device_ids,
 122         .ops = {
 123                 .add = acpi_thermal_add,
 124                 .remove = acpi_thermal_remove,
 125                 .resume = acpi_thermal_resume,
 126                 },
 127 };
 128
 129 struct acpi_thermal_state {
 130         u8 critical:1;
 131         u8 hot:1;
 132         u8 passive:1;
 133         u8 active:1;
 134         u8 reserved:4;
 135         int active_index;
 136 };
 137
 138 struct acpi_thermal_state_flags {
 139         u8 valid:1;
 140         u8 enabled:1;
 141         u8 reserved:6;
 142 };
 143
 144 struct acpi_thermal_critical {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147 };
 148
 149 struct acpi_thermal_hot {
 150         struct acpi_thermal_state_flags flags;
 151         unsigned long temperature;
 152 };
 153
 154 struct acpi_thermal_passive {
 155         struct acpi_thermal_state_flags flags;
 156         unsigned long temperature;
 157         unsigned long tc1;
 158         unsigned long tc2;
 159         unsigned long tsp;
 160         struct acpi_handle_list devices;
 161 };
 162
 163 struct acpi_thermal_active {
 164         struct acpi_thermal_state_flags flags;
 165         unsigned long temperature;
 166         struct acpi_handle_list devices;
 167 };
 168
 169 struct acpi_thermal_trips {
 170         struct acpi_thermal_critical critical;
 171         struct acpi_thermal_hot hot;
 172         struct acpi_thermal_passive passive;
 173         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 174 };
 175
 176 struct acpi_thermal_flags {
 177         u8 cooling_mode:1;      /* _SCP */
 178         u8 devices:1;           /* _TZD */
 179         u8 reserved:6;
 180 };
 181
 182 struct acpi_thermal {
 183         struct acpi_device * device;
 184         acpi_bus_id name;
 185         unsigned long temperature;
 186         unsigned long last_temperature;
 187         unsigned long polling_frequency;
 188         volatile u8 zombie;
 189         struct acpi_thermal_flags flags;
 190         struct acpi_thermal_state state;
 191         struct acpi_thermal_trips trips;
 192         struct acpi_handle_list devices;
 193         struct thermal_zone_device *thermal_zone;
 194         int tz_enabled;
 195         struct mutex lock;
 196 };
 197
 198 static const struct file_operations acpi_thermal_state_fops = {
 199         .owner = THIS_MODULE,
 200         .open = acpi_thermal_state_open_fs,
 201         .read = seq_read,
 202         .llseek = seq_lseek,
 203         .release = single_release,
 204 };
 205
 206 static const struct file_operations acpi_thermal_temp_fops = {
 207         .owner = THIS_MODULE,
 208         .open = acpi_thermal_temp_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static const struct file_operations acpi_thermal_trip_fops = {
 215         .owner = THIS_MODULE,
 216         .open = acpi_thermal_trip_open_fs,
 217         .read = seq_read,
 218         .llseek = seq_lseek,
 219         .release = single_release,
 220 };
 221
 222 static const struct file_operations acpi_thermal_cooling_fops = {
 223         .owner = THIS_MODULE,
 224         .open = acpi_thermal_cooling_open_fs,
 225         .read = seq_read,
 226         .write = acpi_thermal_write_cooling_mode,
 227         .llseek = seq_lseek,
 228         .release = single_release,
 229 };
 230
 231 static const struct file_operations acpi_thermal_polling_fops = {
 232         .owner = THIS_MODULE,
 233         .open = acpi_thermal_polling_open_fs,
 234         .read = seq_read,
 235         .write = acpi_thermal_write_polling,
 236         .llseek = seq_lseek,
 237         .release = single_release,
 238 };
 239
 240 /* --------------------------------------------------------------------------
 241                              Thermal Zone Management
 242    -------------------------------------------------------------------------- */
 243
 244 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 245 {
 246         acpi_status status = AE_OK;
 247         unsigned long long tmp;
 248
 249         if (!tz)
 250                 return -EINVAL;
 251
 252         tz->last_temperature = tz->temperature;
 253
 254         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 255         if (ACPI_FAILURE(status))
 256                 return -ENODEV;
 257
 258         tz->temperature = tmp;
 259         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 260                           tz->temperature));
 261
 262         return 0;
 263 }
 264
 265 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 266 {
 267         acpi_status status = AE_OK;
 268         unsigned long long tmp;
 269
 270         if (!tz)
 271                 return -EINVAL;
 272
 273         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 274         if (ACPI_FAILURE(status))
 275                 return -ENODEV;
 276
 277         tz->polling_frequency = tmp;
 278         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 279                           tz->polling_frequency));
 280
 281         return 0;
 282 }
 283
 284 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 285 {
 286
 287         if (!tz)
 288                 return -EINVAL;
 289
 290         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 291
 292         tz->thermal_zone->polling_delay = seconds * 1000;
 293
 294         if (tz->tz_enabled)
 295                 thermal_zone_device_update(tz->thermal_zone);
 296
 297         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 298                           "Polling frequency set to %lu seconds\n",
 299                           tz->polling_frequency/10));
 300
 301         return 0;
 302 }
 303
 304 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 305 {
 306         acpi_status status = AE_OK;
 307         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 308         struct acpi_object_list arg_list = { 1, &arg0 };
 309         acpi_handle handle = NULL;
 310
 311
 312         if (!tz)
 313                 return -EINVAL;
 314
 315         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 316         if (ACPI_FAILURE(status)) {
 317                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 318                 return -ENODEV;
 319         }
 320
 321         arg0.integer.value = mode;
 322
 323         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 324         if (ACPI_FAILURE(status))
 325                 return -ENODEV;
 326
 327         return 0;
 328 }
 329
 330 #define ACPI_TRIPS_CRITICAL     0x01
 331 #define ACPI_TRIPS_HOT          0x02
 332 #define ACPI_TRIPS_PASSIVE      0x04
 333 #define ACPI_TRIPS_ACTIVE       0x08
 334 #define ACPI_TRIPS_DEVICES      0x10
 335
 336 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 337 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 338
 339 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 340                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 341                               ACPI_TRIPS_DEVICES)
 342
 343 /*
 344  * This exception is thrown out in two cases:
 345  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 346  *   when re-evaluating the AML code.
 347  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 348  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 349  */
 350 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 351 do {    \
 352         if (flags != ACPI_TRIPS_INIT)   \
 353                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 354                 "ACPI thermal trip point %s changed\n"  \
 355                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 356 } while (0)
 357
 358 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 359 {
 360         acpi_status status = AE_OK;
 361         unsigned long long tmp;
 362         struct acpi_handle_list devices;
 363         int valid = 0;
 364         int i;
 365
 366         /* Critical Shutdown (required) */
 367         if (flag & ACPI_TRIPS_CRITICAL) {
 368                 status = acpi_evaluate_integer(tz->device->handle,
 369                                 "_CRT", NULL, &tmp);
 370                 tz->trips.critical.temperature = tmp;
 371                 /*
 372                  * Treat freezing temperatures as invalid as well; some
 373                  * BIOSes return really low values and cause reboots at startup.
 374                  * Below zero (Celcius) values clearly aren't right for sure..
 375                  * ... so lets discard those as invalid.
 376                  */
 377                 if (ACPI_FAILURE(status) ||
 378                                 tz->trips.critical.temperature <= 2732) {
 379                         tz->trips.critical.flags.valid = 0;
 380                         ACPI_EXCEPTION((AE_INFO, status,
 381                                         "No or invalid critical threshold"));
 382                         return -ENODEV;
 383                 } else {
 384                         tz->trips.critical.flags.valid = 1;
 385                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 386                                         "Found critical threshold [%lu]\n",
 387                                         tz->trips.critical.temperature));
 388                 }
 389                 if (tz->trips.critical.flags.valid == 1) {
 390                         if (crt == -1) {
 391                                 tz->trips.critical.flags.valid = 0;
 392                         } else if (crt > 0) {
 393                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 394                                 /*
 395                                  * Allow override critical threshold
 396                                  */
 397                                 if (crt_k > tz->trips.critical.temperature)
 398                                         printk(KERN_WARNING PREFIX
 399                                                 "Critical threshold %d C\n", crt);
 400                                 tz->trips.critical.temperature = crt_k;
 401                         }
 402                 }
 403         }
 404
 405         /* Critical Sleep (optional) */
 406         if (flag & ACPI_TRIPS_HOT) {
 407                 status = acpi_evaluate_integer(tz->device->handle,
 408                                 "_HOT", NULL, &tmp);
 409                 if (ACPI_FAILURE(status)) {
 410                         tz->trips.hot.flags.valid = 0;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                         "No hot threshold\n"));
 413                 } else {
 414                         tz->trips.hot.temperature = tmp;
 415                         tz->trips.hot.flags.valid = 1;
 416                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 417                                         "Found hot threshold [%lu]\n",
 418                                         tz->trips.critical.temperature));
 419                 }
 420         }
 421
 422         /* Passive (optional) */
 423         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 424                 (flag == ACPI_TRIPS_INIT)) {
 425                 valid = tz->trips.passive.flags.valid;
 426                 if (psv == -1) {
 427                         status = AE_SUPPORT;
 428                 } else if (psv > 0) {
 429                         tmp = CELSIUS_TO_KELVIN(psv);
 430                         status = AE_OK;
 431                 } else {
 432                         status = acpi_evaluate_integer(tz->device->handle,
 433                                 "_PSV", NULL, &tmp);
 434                 }
 435
 436                 if (ACPI_FAILURE(status))
 437                         tz->trips.passive.flags.valid = 0;
 438                 else {
 439                         tz->trips.passive.temperature = tmp;
 440                         tz->trips.passive.flags.valid = 1;
 441                         if (flag == ACPI_TRIPS_INIT) {
 442                                 status = acpi_evaluate_integer(
 443                                                 tz->device->handle, "_TC1",
 444                                                 NULL, &tmp);
 445                                 if (ACPI_FAILURE(status))
 446                                         tz->trips.passive.flags.valid = 0;
 447                                 else
 448                                         tz->trips.passive.tc1 = tmp;
 449                                 status = acpi_evaluate_integer(
 450                                                 tz->device->handle, "_TC2",
 451                                                 NULL, &tmp);
 452                                 if (ACPI_FAILURE(status))
 453                                         tz->trips.passive.flags.valid = 0;
 454                                 else
 455                                         tz->trips.passive.tc2 = tmp;
 456                                 status = acpi_evaluate_integer(
 457                                                 tz->device->handle, "_TSP",
 458                                                 NULL, &tmp);
 459                                 if (ACPI_FAILURE(status))
 460                                         tz->trips.passive.flags.valid = 0;
 461                                 else
 462                                         tz->trips.passive.tsp = tmp;
 463                         }
 464                 }
 465         }
 466         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 467                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 468                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 469                                                         NULL, &devices);
 470                 if (ACPI_FAILURE(status)) {
 471                         printk(KERN_WARNING PREFIX
 472                                 "Invalid passive threshold\n");
 473                         tz->trips.passive.flags.valid = 0;
 474                 }
 475                 else
 476                         tz->trips.passive.flags.valid = 1;
 477
 478                 if (memcmp(&tz->trips.passive.devices, &devices,
 479                                 sizeof(struct acpi_handle_list))) {
 480                         memcpy(&tz->trips.passive.devices, &devices,
 481                                 sizeof(struct acpi_handle_list));
 482                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 483                 }
 484         }
 485         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 486                 if (valid != tz->trips.passive.flags.valid)
 487                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 488         }
 489
 490         /* Active (optional) */
 491         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 492                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 493                 valid = tz->trips.active[i].flags.valid;
 494
 495                 if (act == -1)
 496                         break; /* disable all active trip points */
 497
 498                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 499                         tz->trips.active[i].flags.valid)) {
 500                         status = acpi_evaluate_integer(tz->device->handle,
 501                                                         name, NULL, &tmp);
 502                         if (ACPI_FAILURE(status)) {
 503                                 tz->trips.active[i].flags.valid = 0;
 504                                 if (i == 0)
 505                                         break;
 506                                 if (act <= 0)
 507                                         break;
 508                                 if (i == 1)
 509                                         tz->trips.active[0].temperature =
 510                                                 CELSIUS_TO_KELVIN(act);
 511                                 else
 512                                         /*
 513                                          * Don't allow override higher than
 514                                          * the next higher trip point
 515                                          */
 516                                         tz->trips.active[i - 1].temperature =
 517                                                 (tz->trips.active[i - 2].temperature <
 518                                                 CELSIUS_TO_KELVIN(act) ?
 519                                                 tz->trips.active[i - 2].temperature :
 520                                                 CELSIUS_TO_KELVIN(act));
 521                                 break;
 522                         } else {
 523                                 tz->trips.active[i].temperature = tmp;
 524                                 tz->trips.active[i].flags.valid = 1;
 525                         }
 526                 }
 527
 528                 name[2] = 'L';
 529                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 530                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 531                         status = acpi_evaluate_reference(tz->device->handle,
 532                                                 name, NULL, &devices);
 533                         if (ACPI_FAILURE(status)) {
 534                                 printk(KERN_WARNING PREFIX
 535                                         "Invalid active%d threshold\n", i);
 536                                 tz->trips.active[i].flags.valid = 0;
 537                         }
 538                         else
 539                                 tz->trips.active[i].flags.valid = 1;
 540
 541                         if (memcmp(&tz->trips.active[i].devices, &devices,
 542                                         sizeof(struct acpi_handle_list))) {
 543                                 memcpy(&tz->trips.active[i].devices, &devices,
 544                                         sizeof(struct acpi_handle_list));
 545                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 546                         }
 547                 }
 548                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 549                         if (valid != tz->trips.active[i].flags.valid)
 550                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 551
 552                 if (!tz->trips.active[i].flags.valid)
 553                         break;
 554         }
 555
 556         if (flag & ACPI_TRIPS_DEVICES) {
 557                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 558                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 559                                                 NULL, &devices);
 560                 if (memcmp(&tz->devices, &devices,
 561                                 sizeof(struct acpi_handle_list))) {
 562                         memcpy(&tz->devices, &devices,
 563                                 sizeof(struct acpi_handle_list));
 564                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 565                 }
 566         }
 567
 568         return 0;
 569 }
 570
 571 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 572 {
 573         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 574 }
 575
 576 static void acpi_thermal_check(void *data)
 577 {
 578         struct acpi_thermal *tz = data;
 579
 580         thermal_zone_device_update(tz->thermal_zone);
 581 }
 582
 583 /* sys I/F for generic thermal sysfs support */
 584 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
 585
 586 static int thermal_get_temp(struct thermal_zone_device *thermal,
 587                             unsigned long *temp)
 588 {
 589         struct acpi_thermal *tz = thermal->devdata;
 590         int result;
 591
 592         if (!tz)
 593                 return -EINVAL;
 594
 595         result = acpi_thermal_get_temperature(tz);
 596         if (result)
 597                 return result;
 598
 599         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature);
 600         return 0;
 601 }
 602
 603 static const char enabled[] = "kernel";
 604 static const char disabled[] = "user";
 605 static int thermal_get_mode(struct thermal_zone_device *thermal,
 606                                 enum thermal_device_mode *mode)
 607 {
 608         struct acpi_thermal *tz = thermal->devdata;
 609
 610         if (!tz)
 611                 return -EINVAL;
 612
 613         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 614                 THERMAL_DEVICE_DISABLED;
 615
 616         return 0;
 617 }
 618
 619 static int thermal_set_mode(struct thermal_zone_device *thermal,
 620                                 enum thermal_device_mode mode)
 621 {
 622         struct acpi_thermal *tz = thermal->devdata;
 623         int enable;
 624
 625         if (!tz)
 626                 return -EINVAL;
 627
 628         /*
 629          * enable/disable thermal management from ACPI thermal driver
 630          */
 631         if (mode == THERMAL_DEVICE_ENABLED)
 632                 enable = 1;
 633         else if (mode == THERMAL_DEVICE_DISABLED)
 634                 enable = 0;
 635         else
 636                 return -EINVAL;
 637
 638         if (enable != tz->tz_enabled) {
 639                 tz->tz_enabled = enable;
 640                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 641                         "%s ACPI thermal control\n",
 642                         tz->tz_enabled ? enabled : disabled));
 643                 acpi_thermal_check(tz);
 644         }
 645         return 0;
 646 }
 647
 648 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 649                                  int trip, enum thermal_trip_type *type)
 650 {
 651         struct acpi_thermal *tz = thermal->devdata;
 652         int i;
 653
 654         if (!tz || trip < 0)
 655                 return -EINVAL;
 656
 657         if (tz->trips.critical.flags.valid) {
 658                 if (!trip) {
 659                         *type = THERMAL_TRIP_CRITICAL;
 660                         return 0;
 661                 }
 662                 trip--;
 663         }
 664
 665         if (tz->trips.hot.flags.valid) {
 666                 if (!trip) {
 667                         *type = THERMAL_TRIP_HOT;
 668                         return 0;
 669                 }
 670                 trip--;
 671         }
 672
 673         if (tz->trips.passive.flags.valid) {
 674                 if (!trip) {
 675                         *type = THERMAL_TRIP_PASSIVE;
 676                         return 0;
 677                 }
 678                 trip--;
 679         }
 680
 681         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 682                 tz->trips.active[i].flags.valid; i++) {
 683                 if (!trip) {
 684                         *type = THERMAL_TRIP_ACTIVE;
 685                         return 0;
 686                 }
 687                 trip--;
 688         }
 689
 690         return -EINVAL;
 691 }
 692
 693 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 694                                  int trip, unsigned long *temp)
 695 {
 696         struct acpi_thermal *tz = thermal->devdata;
 697         int i;
 698
 699         if (!tz || trip < 0)
 700                 return -EINVAL;
 701
 702         if (tz->trips.critical.flags.valid) {
 703                 if (!trip) {
 704                         *temp = KELVIN_TO_MILLICELSIUS(
 705                                 tz->trips.critical.temperature);
 706                         return 0;
 707                 }
 708                 trip--;
 709         }
 710
 711         if (tz->trips.hot.flags.valid) {
 712                 if (!trip) {
 713                         *temp = KELVIN_TO_MILLICELSIUS(
 714                                 tz->trips.hot.temperature);
 715                         return 0;
 716                 }
 717                 trip--;
 718         }
 719
 720         if (tz->trips.passive.flags.valid) {
 721                 if (!trip) {
 722                         *temp = KELVIN_TO_MILLICELSIUS(
 723                                 tz->trips.passive.temperature);
 724                         return 0;
 725                 }
 726                 trip--;
 727         }
 728
 729         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 730                 tz->trips.active[i].flags.valid; i++) {
 731                 if (!trip) {
 732                         *temp = KELVIN_TO_MILLICELSIUS(
 733                                 tz->trips.active[i].temperature);
 734                         return 0;
 735                 }
 736                 trip--;
 737         }
 738
 739         return -EINVAL;
 740 }
 741
 742 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 743                                 unsigned long *temperature) {
 744         struct acpi_thermal *tz = thermal->devdata;
 745
 746         if (tz->trips.critical.flags.valid) {
 747                 *temperature = KELVIN_TO_MILLICELSIUS(
 748                                 tz->trips.critical.temperature);
 749                 return 0;
 750         } else
 751                 return -EINVAL;
 752 }
 753
 754 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 755                            enum thermal_trip_type trip_type)
 756 {
 757         u8 type = 0;
 758         struct acpi_thermal *tz = thermal->devdata;
 759
 760         if (trip_type == THERMAL_TRIP_CRITICAL)
 761                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 762         else if (trip_type == THERMAL_TRIP_HOT)
 763                 type = ACPI_THERMAL_NOTIFY_HOT;
 764         else
 765                 return 0;
 766
 767         acpi_bus_generate_proc_event(tz->device, type, 1);
 768         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 769                                         dev_name(&tz->device->dev), type, 1);
 770
 771         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 772                 return 1;
 773
 774         return 0;
 775 }
 776
 777 typedef int (*cb)(struct thermal_zone_device *, int,
 778                   struct thermal_cooling_device *);
 779 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 780                                         struct thermal_cooling_device *cdev,
 781                                         cb action)
 782 {
 783         struct acpi_device *device = cdev->devdata;
 784         struct acpi_thermal *tz = thermal->devdata;
 785         struct acpi_device *dev;
 786         acpi_status status;
 787         acpi_handle handle;
 788         int i;
 789         int j;
 790         int trip = -1;
 791         int result = 0;
 792
 793         if (tz->trips.critical.flags.valid)
 794                 trip++;
 795
 796         if (tz->trips.hot.flags.valid)
 797                 trip++;
 798
 799         if (tz->trips.passive.flags.valid) {
 800                 trip++;
 801                 for (i = 0; i < tz->trips.passive.devices.count;
 802                     i++) {
 803                         handle = tz->trips.passive.devices.handles[i];
 804                         status = acpi_bus_get_device(handle, &dev);
 805                         if (ACPI_SUCCESS(status) && (dev == device)) {
 806                                 result = action(thermal, trip, cdev);
 807                                 if (result)
 808                                         goto failed;
 809                         }
 810                 }
 811         }
 812
 813         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 814                 if (!tz->trips.active[i].flags.valid)
 815                         break;
 816                 trip++;
 817                 for (j = 0;
 818                     j < tz->trips.active[i].devices.count;
 819                     j++) {
 820                         handle = tz->trips.active[i].devices.handles[j];
 821                         status = acpi_bus_get_device(handle, &dev);
 822                         if (ACPI_SUCCESS(status) && (dev == device)) {
 823                                 result = action(thermal, trip, cdev);
 824                                 if (result)
 825                                         goto failed;
 826                         }
 827                 }
 828         }
 829
 830         for (i = 0; i < tz->devices.count; i++) {
 831                 handle = tz->devices.handles[i];
 832                 status = acpi_bus_get_device(handle, &dev);
 833                 if (ACPI_SUCCESS(status) && (dev == device)) {
 834                         result = action(thermal, -1, cdev);
 835                         if (result)
 836                                 goto failed;
 837                 }
 838         }
 839
 840 failed:
 841         return result;
 842 }
 843
 844 static int
 845 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 846                                         struct thermal_cooling_device *cdev)
 847 {
 848         return acpi_thermal_cooling_device_cb(thermal, cdev,
 849                                 thermal_zone_bind_cooling_device);
 850 }
 851
 852 static int
 853 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 854                                         struct thermal_cooling_device *cdev)
 855 {
 856         return acpi_thermal_cooling_device_cb(thermal, cdev,
 857                                 thermal_zone_unbind_cooling_device);
 858 }
 859
 860 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 861         .bind = acpi_thermal_bind_cooling_device,
 862         .unbind = acpi_thermal_unbind_cooling_device,
 863         .get_temp = thermal_get_temp,
 864         .get_mode = thermal_get_mode,
 865         .set_mode = thermal_set_mode,
 866         .get_trip_type = thermal_get_trip_type,
 867         .get_trip_temp = thermal_get_trip_temp,
 868         .get_crit_temp = thermal_get_crit_temp,
 869         .notify = thermal_notify,
 870 };
 871
 872 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 873 {
 874         int trips = 0;
 875         int result;
 876         acpi_status status;
 877         int i;
 878
 879         if (tz->trips.critical.flags.valid)
 880                 trips++;
 881
 882         if (tz->trips.hot.flags.valid)
 883                 trips++;
 884
 885         if (tz->trips.passive.flags.valid)
 886                 trips++;
 887
 888         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 889                         tz->trips.active[i].flags.valid; i++, trips++);
 890
 891         if (tz->trips.passive.flags.valid)
 892                 tz->thermal_zone =
 893                         thermal_zone_device_register("acpitz", trips, tz,
 894                                                      &acpi_thermal_zone_ops,
 895                                                      tz->trips.passive.tc1,
 896                                                      tz->trips.passive.tc2,
 897                                                      tz->trips.passive.tsp*100,
 898                                                      tz->polling_frequency*100);
 899         else
 900                 tz->thermal_zone =
 901                         thermal_zone_device_register("acpitz", trips, tz,
 902                                                      &acpi_thermal_zone_ops,
 903                                                      0, 0, 0,
 904                                                      tz->polling_frequency);
 905         if (IS_ERR(tz->thermal_zone))
 906                 return -ENODEV;
 907
 908         result = sysfs_create_link(&tz->device->dev.kobj,
 909                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 910         if (result)
 911                 return result;
 912
 913         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 914                                    &tz->device->dev.kobj, "device");
 915         if (result)
 916                 return result;
 917
 918         status = acpi_attach_data(tz->device->handle,
 919                                   acpi_bus_private_data_handler,
 920                                   tz->thermal_zone);
 921         if (ACPI_FAILURE(status)) {
 922                 printk(KERN_ERR PREFIX
 923                                 "Error attaching device data\n");
 924                 return -ENODEV;
 925         }
 926
 927         tz->tz_enabled = 1;
 928
 929         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 930                  tz->thermal_zone->id);
 931         return 0;
 932 }
 933
 934 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 935 {
 936         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 937         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 938         thermal_zone_device_unregister(tz->thermal_zone);
 939         tz->thermal_zone = NULL;
 940         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 941 }
 942
 943
 944 /* --------------------------------------------------------------------------
 945                               FS Interface (/proc)
 946    -------------------------------------------------------------------------- */
 947
 948 static struct proc_dir_entry *acpi_thermal_dir;
 949
 950 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 951 {
 952         struct acpi_thermal *tz = seq->private;
 953
 954
 955         if (!tz)
 956                 goto end;
 957
 958         seq_puts(seq, "state:                   ");
 959
 960         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 961             && !tz->state.active)
 962                 seq_puts(seq, "ok\n");
 963         else {
 964                 if (tz->state.critical)
 965                         seq_puts(seq, "critical ");
 966                 if (tz->state.hot)
 967                         seq_puts(seq, "hot ");
 968                 if (tz->state.passive)
 969                         seq_puts(seq, "passive ");
 970                 if (tz->state.active)
 971                         seq_printf(seq, "active[%d]", tz->state.active_index);
 972                 seq_puts(seq, "\n");
 973         }
 974
 975       end:
 976         return 0;
 977 }
 978
 979 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 980 {
 981         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 982 }
 983
 984 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 985 {
 986         int result = 0;
 987         struct acpi_thermal *tz = seq->private;
 988
 989
 990         if (!tz)
 991                 goto end;
 992
 993         result = acpi_thermal_get_temperature(tz);
 994         if (result)
 995                 goto end;
 996
 997         seq_printf(seq, "temperature:             %ld C\n",
 998                    KELVIN_TO_CELSIUS(tz->temperature));
 999
1000       end:
1001         return 0;
1002 }
1003
1004 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1005 {
1006         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1007 }
1008
1009 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1010 {
1011         struct acpi_thermal *tz = seq->private;
1012         struct acpi_device *device;
1013         acpi_status status;
1014
1015         int i = 0;
1016         int j = 0;
1017
1018
1019         if (!tz)
1020                 goto end;
1021
1022         if (tz->trips.critical.flags.valid)
1023                 seq_printf(seq, "critical (S5):           %ld C%s",
1024                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1025                            nocrt ? " <disabled>\n" : "\n");
1026
1027         if (tz->trips.hot.flags.valid)
1028                 seq_printf(seq, "hot (S4):                %ld C%s",
1029                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1030                            nocrt ? " <disabled>\n" : "\n");
1031
1032         if (tz->trips.passive.flags.valid) {
1033                 seq_printf(seq,
1034                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1035                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1036                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1037                            tz->trips.passive.tsp);
1038                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1039                         status = acpi_bus_get_device(tz->trips.passive.devices.
1040                                                      handles[j], &device);
1041                         seq_printf(seq, "%4.4s ", status ? "" :
1042                                    acpi_device_bid(device));
1043                 }
1044                 seq_puts(seq, "\n");
1045         }
1046
1047         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1048                 if (!(tz->trips.active[i].flags.valid))
1049                         break;
1050                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1051                            i,
1052                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1053                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1054                         status = acpi_bus_get_device(tz->trips.active[i].
1055                                                      devices.handles[j],
1056                                                      &device);
1057                         seq_printf(seq, "%4.4s ", status ? "" :
1058                                    acpi_device_bid(device));
1059                 }
1060                 seq_puts(seq, "\n");
1061         }
1062
1063       end:
1064         return 0;
1065 }
1066
1067 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1068 {
1069         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1070 }
1071
1072 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1073 {
1074         struct acpi_thermal *tz = seq->private;
1075
1076
1077         if (!tz)
1078                 goto end;
1079
1080         if (!tz->flags.cooling_mode)
1081                 seq_puts(seq, "<setting not supported>\n");
1082         else
1083                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1084
1085       end:
1086         return 0;
1087 }
1088
1089 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1090 {
1091         return single_open(file, acpi_thermal_cooling_seq_show,
1092                            PDE(inode)->data);
1093 }
1094
1095 static ssize_t
1096 acpi_thermal_write_cooling_mode(struct file *file,
1097                                 const char __user * buffer,
1098                                 size_t count, loff_t * ppos)
1099 {
1100         struct seq_file *m = file->private_data;
1101         struct acpi_thermal *tz = m->private;
1102         int result = 0;
1103         char mode_string[12] = { '\0' };
1104
1105
1106         if (!tz || (count > sizeof(mode_string) - 1))
1107                 return -EINVAL;
1108
1109         if (!tz->flags.cooling_mode)
1110                 return -ENODEV;
1111
1112         if (copy_from_user(mode_string, buffer, count))
1113                 return -EFAULT;
1114
1115         mode_string[count] = '\0';
1116
1117         result = acpi_thermal_set_cooling_mode(tz,
1118                                                simple_strtoul(mode_string, NULL,
1119                                                               0));
1120         if (result)
1121                 return result;
1122
1123         acpi_thermal_check(tz);
1124
1125         return count;
1126 }
1127
1128 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1129 {
1130         struct acpi_thermal *tz = seq->private;
1131
1132
1133         if (!tz)
1134                 goto end;
1135
1136         if (!tz->thermal_zone->polling_delay) {
1137                 seq_puts(seq, "<polling disabled>\n");
1138                 goto end;
1139         }
1140
1141         seq_printf(seq, "polling frequency:       %d seconds\n",
1142                    (tz->thermal_zone->polling_delay / 1000));
1143
1144       end:
1145         return 0;
1146 }
1147
1148 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1149 {
1150         return single_open(file, acpi_thermal_polling_seq_show,
1151                            PDE(inode)->data);
1152 }
1153
1154 static ssize_t
1155 acpi_thermal_write_polling(struct file *file,
1156                            const char __user * buffer,
1157                            size_t count, loff_t * ppos)
1158 {
1159         struct seq_file *m = file->private_data;
1160         struct acpi_thermal *tz = m->private;
1161         int result = 0;
1162         char polling_string[12] = { '\0' };
1163         int seconds = 0;
1164
1165
1166         if (!tz || (count > sizeof(polling_string) - 1))
1167                 return -EINVAL;
1168
1169         if (copy_from_user(polling_string, buffer, count))
1170                 return -EFAULT;
1171
1172         polling_string[count] = '\0';
1173
1174         seconds = simple_strtoul(polling_string, NULL, 0);
1175
1176         result = acpi_thermal_set_polling(tz, seconds);
1177         if (result)
1178                 return result;
1179
1180         acpi_thermal_check(tz);
1181
1182         return count;
1183 }
1184
1185 static int acpi_thermal_add_fs(struct acpi_device *device)
1186 {
1187         struct proc_dir_entry *entry = NULL;
1188
1189
1190         if (!acpi_device_dir(device)) {
1191                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1192                                                      acpi_thermal_dir);
1193                 if (!acpi_device_dir(device))
1194                         return -ENODEV;
1195                 acpi_device_dir(device)->owner = THIS_MODULE;
1196         }
1197
1198         /* 'state' [R] */
1199         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1200                                  S_IRUGO, acpi_device_dir(device),
1201                                  &acpi_thermal_state_fops,
1202                                  acpi_driver_data(device));
1203         if (!entry)
1204                 return -ENODEV;
1205
1206         /* 'temperature' [R] */
1207         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1208                                  S_IRUGO, acpi_device_dir(device),
1209                                  &acpi_thermal_temp_fops,
1210                                  acpi_driver_data(device));
1211         if (!entry)
1212                 return -ENODEV;
1213
1214         /* 'trip_points' [R] */
1215         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1216                                  S_IRUGO,
1217                                  acpi_device_dir(device),
1218                                  &acpi_thermal_trip_fops,
1219                                  acpi_driver_data(device));
1220         if (!entry)
1221                 return -ENODEV;
1222
1223         /* 'cooling_mode' [R/W] */
1224         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1225                                  S_IFREG | S_IRUGO | S_IWUSR,
1226                                  acpi_device_dir(device),
1227                                  &acpi_thermal_cooling_fops,
1228                                  acpi_driver_data(device));
1229         if (!entry)
1230                 return -ENODEV;
1231
1232         /* 'polling_frequency' [R/W] */
1233         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1234                                  S_IFREG | S_IRUGO | S_IWUSR,
1235                                  acpi_device_dir(device),
1236                                  &acpi_thermal_polling_fops,
1237                                  acpi_driver_data(device));
1238         if (!entry)
1239                 return -ENODEV;
1240         return 0;
1241 }
1242
1243 static int acpi_thermal_remove_fs(struct acpi_device *device)
1244 {
1245
1246         if (acpi_device_dir(device)) {
1247                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1248                                   acpi_device_dir(device));
1249                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1250                                   acpi_device_dir(device));
1251                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1252                                   acpi_device_dir(device));
1253                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1254                                   acpi_device_dir(device));
1255                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1256                                   acpi_device_dir(device));
1257                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1258                 acpi_device_dir(device) = NULL;
1259         }
1260
1261         return 0;
1262 }
1263
1264 /* --------------------------------------------------------------------------
1265                                  Driver Interface
1266    -------------------------------------------------------------------------- */
1267
1268 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1269 {
1270         struct acpi_thermal *tz = data;
1271         struct acpi_device *device = NULL;
1272
1273
1274         if (!tz)
1275                 return;
1276
1277         device = tz->device;
1278
1279         switch (event) {
1280         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1281                 acpi_thermal_check(tz);
1282                 break;
1283         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1284                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1285                 acpi_thermal_check(tz);
1286                 acpi_bus_generate_proc_event(device, event, 0);
1287                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1288                                                   dev_name(&device->dev), event, 0);
1289                 break;
1290         case ACPI_THERMAL_NOTIFY_DEVICES:
1291                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1292                 acpi_thermal_check(tz);
1293                 acpi_bus_generate_proc_event(device, event, 0);
1294                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1295                                                   dev_name(&device->dev), event, 0);
1296                 break;
1297         default:
1298                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1299                                   "Unsupported event [0x%x]\n", event));
1300                 break;
1301         }
1302
1303         return;
1304 }
1305
1306 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1307 {
1308         int result = 0;
1309
1310
1311         if (!tz)
1312                 return -EINVAL;
1313
1314         /* Get temperature [_TMP] (required) */
1315         result = acpi_thermal_get_temperature(tz);
1316         if (result)
1317                 return result;
1318
1319         /* Get trip points [_CRT, _PSV, etc.] (required) */
1320         result = acpi_thermal_get_trip_points(tz);
1321         if (result)
1322                 return result;
1323
1324         /* Set the cooling mode [_SCP] to active cooling (default) */
1325         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1326         if (!result)
1327                 tz->flags.cooling_mode = 1;
1328
1329         /* Get default polling frequency [_TZP] (optional) */
1330         if (tzp)
1331                 tz->polling_frequency = tzp;
1332         else
1333                 acpi_thermal_get_polling_frequency(tz);
1334
1335         return 0;
1336 }
1337
1338 static int acpi_thermal_add(struct acpi_device *device)
1339 {
1340         int result = 0;
1341         acpi_status status = AE_OK;
1342         struct acpi_thermal *tz = NULL;
1343
1344
1345         if (!device)
1346                 return -EINVAL;
1347
1348         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1349         if (!tz)
1350                 return -ENOMEM;
1351
1352         tz->device = device;
1353         strcpy(tz->name, device->pnp.bus_id);
1354         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1355         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1356         device->driver_data = tz;
1357         mutex_init(&tz->lock);
1358
1359
1360         result = acpi_thermal_get_info(tz);
1361         if (result)
1362                 goto free_memory;
1363
1364         result = acpi_thermal_register_thermal_zone(tz);
1365         if (result)
1366                 goto free_memory;
1367
1368         result = acpi_thermal_add_fs(device);
1369         if (result)
1370                 goto unregister_thermal_zone;
1371
1372         status = acpi_install_notify_handler(device->handle,
1373                                              ACPI_DEVICE_NOTIFY,
1374                                              acpi_thermal_notify, tz);
1375         if (ACPI_FAILURE(status)) {
1376                 result = -ENODEV;
1377                 goto remove_fs;
1378         }
1379
1380         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1381                acpi_device_name(device), acpi_device_bid(device),
1382                KELVIN_TO_CELSIUS(tz->temperature));
1383         goto end;
1384
1385 remove_fs:
1386         acpi_thermal_remove_fs(device);
1387 unregister_thermal_zone:
1388         thermal_zone_device_unregister(tz->thermal_zone);
1389 free_memory:
1390         kfree(tz);
1391 end:
1392         return result;
1393 }
1394
1395 static int acpi_thermal_remove(struct acpi_device *device, int type)
1396 {
1397         acpi_status status = AE_OK;
1398         struct acpi_thermal *tz = NULL;
1399
1400         if (!device || !acpi_driver_data(device))
1401                 return -EINVAL;
1402
1403         tz = acpi_driver_data(device);
1404
1405         status = acpi_remove_notify_handler(device->handle,
1406                                             ACPI_DEVICE_NOTIFY,
1407                                             acpi_thermal_notify);
1408
1409         acpi_thermal_remove_fs(device);
1410         acpi_thermal_unregister_thermal_zone(tz);
1411         mutex_destroy(&tz->lock);
1412         kfree(tz);
1413         return 0;
1414 }
1415
1416 static int acpi_thermal_resume(struct acpi_device *device)
1417 {
1418         struct acpi_thermal *tz = NULL;
1419         int i, j, power_state, result;
1420
1421
1422         if (!device || !acpi_driver_data(device))
1423                 return -EINVAL;
1424
1425         tz = acpi_driver_data(device);
1426
1427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1428                 if (!(&tz->trips.active[i]))
1429                         break;
1430                 if (!tz->trips.active[i].flags.valid)
1431                         break;
1432                 tz->trips.active[i].flags.enabled = 1;
1433                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1434                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1435                             handles[j], &power_state);
1436                         if (result || (power_state != ACPI_STATE_D0)) {
1437                                 tz->trips.active[i].flags.enabled = 0;
1438                                 break;
1439                         }
1440                 }
1441                 tz->state.active |= tz->trips.active[i].flags.enabled;
1442         }
1443
1444         acpi_thermal_check(tz);
1445
1446         return AE_OK;
1447 }
1448
1449 static int thermal_act(const struct dmi_system_id *d) {
1450
1451         if (act == 0) {
1452                 printk(KERN_NOTICE "ACPI: %s detected: "
1453                         "disabling all active thermal trip points\n", d->ident);
1454                 act = -1;
1455         }
1456         return 0;
1457 }
1458 static int thermal_nocrt(const struct dmi_system_id *d) {
1459
1460         printk(KERN_NOTICE "ACPI: %s detected: "
1461                 "disabling all critical thermal trip point actions.\n", d->ident);
1462         nocrt = 1;
1463         return 0;
1464 }
1465 static int thermal_tzp(const struct dmi_system_id *d) {
1466
1467         if (tzp == 0) {
1468                 printk(KERN_NOTICE "ACPI: %s detected: "
1469                         "enabling thermal zone polling\n", d->ident);
1470                 tzp = 300;      /* 300 dS = 30 Seconds */
1471         }
1472         return 0;
1473 }
1474 static int thermal_psv(const struct dmi_system_id *d) {
1475
1476         if (psv == 0) {
1477                 printk(KERN_NOTICE "ACPI: %s detected: "
1478                         "disabling all passive thermal trip points\n", d->ident);
1479                 psv = -1;
1480         }
1481         return 0;
1482 }
1483
1484 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1485         /*
1486          * Award BIOS on this AOpen makes thermal control almost worthless.
1487          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1488          */
1489         {
1490          .callback = thermal_act,
1491          .ident = "AOpen i915GMm-HFS",
1492          .matches = {
1493                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1494                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1495                 },
1496         },
1497         {
1498          .callback = thermal_psv,
1499          .ident = "AOpen i915GMm-HFS",
1500          .matches = {
1501                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1502                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1503                 },
1504         },
1505         {
1506          .callback = thermal_tzp,
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_nocrt,
1515          .ident = "Gigabyte GA-7ZX",
1516          .matches = {
1517                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1518                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1519                 },
1520         },
1521         {}
1522 };
1523
1524 static int __init acpi_thermal_init(void)
1525 {
1526         int result = 0;
1527
1528         dmi_check_system(thermal_dmi_table);
1529
1530         if (off) {
1531                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1532                 return -ENODEV;
1533         }
1534         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1535         if (!acpi_thermal_dir)
1536                 return -ENODEV;
1537         acpi_thermal_dir->owner = THIS_MODULE;
1538
1539         result = acpi_bus_register_driver(&acpi_thermal_driver);
1540         if (result < 0) {
1541                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1542                 return -ENODEV;
1543         }
1544
1545         return 0;
1546 }
1547
1548 static void __exit acpi_thermal_exit(void)
1549 {
1550
1551         acpi_bus_unregister_driver(&acpi_thermal_driver);
1552
1553         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1554
1555         return;
1556 }
1557
1558 module_init(acpi_thermal_init);
1559 module_exit(acpi_thermal_exit);