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   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <linux/device.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/thermal.h>
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define PREFIX "ACPI: "
  51
  52 #define ACPI_THERMAL_CLASS              "thermal_zone"
  53 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  54 #define ACPI_THERMAL_FILE_STATE         "state"
  55 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  56 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  57 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  58 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  59 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  60 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  61 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  62 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  63 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  64 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  70 ACPI_MODULE_NAME("thermal");
  71
  72 MODULE_AUTHOR("Paul Diefenbaugh");
  73 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int act;
  77 module_param(act, int, 0644);
  78 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  79
  80 static int crt;
  81 module_param(crt, int, 0644);
  82 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  83
  84 static int tzp;
  85 module_param(tzp, int, 0444);
  86 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  87
  88 static int nocrt;
  89 module_param(nocrt, int, 0);
  90 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  91
  92 static int off;
  93 module_param(off, int, 0);
  94 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  95
  96 static int psv;
  97 module_param(psv, int, 0644);
  98 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  99
 100 static int acpi_thermal_add(struct acpi_device *device);
 101 static int acpi_thermal_remove(struct acpi_device *device, int type);
 102 static int acpi_thermal_resume(struct acpi_device *device);
 103 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 104 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 105 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 108 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 109                                                const char __user *, size_t,
 110                                                loff_t *);
 111 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 112 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 113                                           size_t, loff_t *);
 114
 115 static const struct acpi_device_id  thermal_device_ids[] = {
 116         {ACPI_THERMAL_HID, 0},
 117         {"", 0},
 118 };
 119 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 120
 121 static struct acpi_driver acpi_thermal_driver = {
 122         .name = "thermal",
 123         .class = ACPI_THERMAL_CLASS,
 124         .ids = thermal_device_ids,
 125         .ops = {
 126                 .add = acpi_thermal_add,
 127                 .remove = acpi_thermal_remove,
 128                 .resume = acpi_thermal_resume,
 129                 .notify = acpi_thermal_notify,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct thermal_zone_device *thermal_zone;
 198         int tz_enabled;
 199         int kelvin_offset;
 200         struct mutex lock;
 201 };
 202
 203 static const struct file_operations acpi_thermal_state_fops = {
 204         .owner = THIS_MODULE,
 205         .open = acpi_thermal_state_open_fs,
 206         .read = seq_read,
 207         .llseek = seq_lseek,
 208         .release = single_release,
 209 };
 210
 211 static const struct file_operations acpi_thermal_temp_fops = {
 212         .owner = THIS_MODULE,
 213         .open = acpi_thermal_temp_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static const struct file_operations acpi_thermal_trip_fops = {
 220         .owner = THIS_MODULE,
 221         .open = acpi_thermal_trip_open_fs,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = single_release,
 225 };
 226
 227 static const struct file_operations acpi_thermal_cooling_fops = {
 228         .owner = THIS_MODULE,
 229         .open = acpi_thermal_cooling_open_fs,
 230         .read = seq_read,
 231         .write = acpi_thermal_write_cooling_mode,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static const struct file_operations acpi_thermal_polling_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_thermal_polling_open_fs,
 239         .read = seq_read,
 240         .write = acpi_thermal_write_polling,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 /* --------------------------------------------------------------------------
 246                              Thermal Zone Management
 247    -------------------------------------------------------------------------- */
 248
 249 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 250 {
 251         acpi_status status = AE_OK;
 252         unsigned long long tmp;
 253
 254         if (!tz)
 255                 return -EINVAL;
 256
 257         tz->last_temperature = tz->temperature;
 258
 259         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 260         if (ACPI_FAILURE(status))
 261                 return -ENODEV;
 262
 263         tz->temperature = tmp;
 264         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 265                           tz->temperature));
 266
 267         return 0;
 268 }
 269
 270 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 271 {
 272         acpi_status status = AE_OK;
 273         unsigned long long tmp;
 274
 275         if (!tz)
 276                 return -EINVAL;
 277
 278         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 279         if (ACPI_FAILURE(status))
 280                 return -ENODEV;
 281
 282         tz->polling_frequency = tmp;
 283         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 284                           tz->polling_frequency));
 285
 286         return 0;
 287 }
 288
 289 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 290 {
 291
 292         if (!tz)
 293                 return -EINVAL;
 294
 295         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 296
 297         tz->thermal_zone->polling_delay = seconds * 1000;
 298
 299         if (tz->tz_enabled)
 300                 thermal_zone_device_update(tz->thermal_zone);
 301
 302         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 303                           "Polling frequency set to %lu seconds\n",
 304                           tz->polling_frequency/10));
 305
 306         return 0;
 307 }
 308
 309 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 310 {
 311         acpi_status status = AE_OK;
 312         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 313         struct acpi_object_list arg_list = { 1, &arg0 };
 314         acpi_handle handle = NULL;
 315
 316
 317         if (!tz)
 318                 return -EINVAL;
 319
 320         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 321         if (ACPI_FAILURE(status)) {
 322                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 323                 return -ENODEV;
 324         }
 325
 326         arg0.integer.value = mode;
 327
 328         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 329         if (ACPI_FAILURE(status))
 330                 return -ENODEV;
 331
 332         return 0;
 333 }
 334
 335 #define ACPI_TRIPS_CRITICAL     0x01
 336 #define ACPI_TRIPS_HOT          0x02
 337 #define ACPI_TRIPS_PASSIVE      0x04
 338 #define ACPI_TRIPS_ACTIVE       0x08
 339 #define ACPI_TRIPS_DEVICES      0x10
 340
 341 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 342 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 343
 344 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 345                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 346                               ACPI_TRIPS_DEVICES)
 347
 348 /*
 349  * This exception is thrown out in two cases:
 350  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 351  *   when re-evaluating the AML code.
 352  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 353  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 354  */
 355 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 356 do {    \
 357         if (flags != ACPI_TRIPS_INIT)   \
 358                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 359                 "ACPI thermal trip point %s changed\n"  \
 360                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 361 } while (0)
 362
 363 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 364 {
 365         acpi_status status = AE_OK;
 366         unsigned long long tmp;
 367         struct acpi_handle_list devices;
 368         int valid = 0;
 369         int i;
 370
 371         /* Critical Shutdown (required) */
 372         if (flag & ACPI_TRIPS_CRITICAL) {
 373                 status = acpi_evaluate_integer(tz->device->handle,
 374                                 "_CRT", NULL, &tmp);
 375                 tz->trips.critical.temperature = tmp;
 376                 /*
 377                  * Treat freezing temperatures as invalid as well; some
 378                  * BIOSes return really low values and cause reboots at startup.
 379                  * Below zero (Celsius) values clearly aren't right for sure..
 380                  * ... so lets discard those as invalid.
 381                  */
 382                 if (ACPI_FAILURE(status) ||
 383                                 tz->trips.critical.temperature <= 2732) {
 384                         tz->trips.critical.flags.valid = 0;
 385                         ACPI_EXCEPTION((AE_INFO, status,
 386                                         "No or invalid critical threshold"));
 387                         return -ENODEV;
 388                 } else {
 389                         tz->trips.critical.flags.valid = 1;
 390                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 391                                         "Found critical threshold [%lu]\n",
 392                                         tz->trips.critical.temperature));
 393                 }
 394                 if (tz->trips.critical.flags.valid == 1) {
 395                         if (crt == -1) {
 396                                 tz->trips.critical.flags.valid = 0;
 397                         } else if (crt > 0) {
 398                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 399                                 /*
 400                                  * Allow override critical threshold
 401                                  */
 402                                 if (crt_k > tz->trips.critical.temperature)
 403                                         printk(KERN_WARNING PREFIX
 404                                                 "Critical threshold %d C\n", crt);
 405                                 tz->trips.critical.temperature = crt_k;
 406                         }
 407                 }
 408         }
 409
 410         /* Critical Sleep (optional) */
 411         if (flag & ACPI_TRIPS_HOT) {
 412                 status = acpi_evaluate_integer(tz->device->handle,
 413                                 "_HOT", NULL, &tmp);
 414                 if (ACPI_FAILURE(status)) {
 415                         tz->trips.hot.flags.valid = 0;
 416                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 417                                         "No hot threshold\n"));
 418                 } else {
 419                         tz->trips.hot.temperature = tmp;
 420                         tz->trips.hot.flags.valid = 1;
 421                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 422                                         "Found hot threshold [%lu]\n",
 423                                         tz->trips.critical.temperature));
 424                 }
 425         }
 426
 427         /* Passive (optional) */
 428         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 429                 (flag == ACPI_TRIPS_INIT)) {
 430                 valid = tz->trips.passive.flags.valid;
 431                 if (psv == -1) {
 432                         status = AE_SUPPORT;
 433                 } else if (psv > 0) {
 434                         tmp = CELSIUS_TO_KELVIN(psv);
 435                         status = AE_OK;
 436                 } else {
 437                         status = acpi_evaluate_integer(tz->device->handle,
 438                                 "_PSV", NULL, &tmp);
 439                 }
 440
 441                 if (ACPI_FAILURE(status))
 442                         tz->trips.passive.flags.valid = 0;
 443                 else {
 444                         tz->trips.passive.temperature = tmp;
 445                         tz->trips.passive.flags.valid = 1;
 446                         if (flag == ACPI_TRIPS_INIT) {
 447                                 status = acpi_evaluate_integer(
 448                                                 tz->device->handle, "_TC1",
 449                                                 NULL, &tmp);
 450                                 if (ACPI_FAILURE(status))
 451                                         tz->trips.passive.flags.valid = 0;
 452                                 else
 453                                         tz->trips.passive.tc1 = tmp;
 454                                 status = acpi_evaluate_integer(
 455                                                 tz->device->handle, "_TC2",
 456                                                 NULL, &tmp);
 457                                 if (ACPI_FAILURE(status))
 458                                         tz->trips.passive.flags.valid = 0;
 459                                 else
 460                                         tz->trips.passive.tc2 = tmp;
 461                                 status = acpi_evaluate_integer(
 462                                                 tz->device->handle, "_TSP",
 463                                                 NULL, &tmp);
 464                                 if (ACPI_FAILURE(status))
 465                                         tz->trips.passive.flags.valid = 0;
 466                                 else
 467                                         tz->trips.passive.tsp = tmp;
 468                         }
 469                 }
 470         }
 471         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 472                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 473                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 474                                                         NULL, &devices);
 475                 if (ACPI_FAILURE(status)) {
 476                         printk(KERN_WARNING PREFIX
 477                                 "Invalid passive threshold\n");
 478                         tz->trips.passive.flags.valid = 0;
 479                 }
 480                 else
 481                         tz->trips.passive.flags.valid = 1;
 482
 483                 if (memcmp(&tz->trips.passive.devices, &devices,
 484                                 sizeof(struct acpi_handle_list))) {
 485                         memcpy(&tz->trips.passive.devices, &devices,
 486                                 sizeof(struct acpi_handle_list));
 487                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 488                 }
 489         }
 490         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 491                 if (valid != tz->trips.passive.flags.valid)
 492                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 493         }
 494
 495         /* Active (optional) */
 496         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 497                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 498                 valid = tz->trips.active[i].flags.valid;
 499
 500                 if (act == -1)
 501                         break; /* disable all active trip points */
 502
 503                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 504                         tz->trips.active[i].flags.valid)) {
 505                         status = acpi_evaluate_integer(tz->device->handle,
 506                                                         name, NULL, &tmp);
 507                         if (ACPI_FAILURE(status)) {
 508                                 tz->trips.active[i].flags.valid = 0;
 509                                 if (i == 0)
 510                                         break;
 511                                 if (act <= 0)
 512                                         break;
 513                                 if (i == 1)
 514                                         tz->trips.active[0].temperature =
 515                                                 CELSIUS_TO_KELVIN(act);
 516                                 else
 517                                         /*
 518                                          * Don't allow override higher than
 519                                          * the next higher trip point
 520                                          */
 521                                         tz->trips.active[i - 1].temperature =
 522                                                 (tz->trips.active[i - 2].temperature <
 523                                                 CELSIUS_TO_KELVIN(act) ?
 524                                                 tz->trips.active[i - 2].temperature :
 525                                                 CELSIUS_TO_KELVIN(act));
 526                                 break;
 527                         } else {
 528                                 tz->trips.active[i].temperature = tmp;
 529                                 tz->trips.active[i].flags.valid = 1;
 530                         }
 531                 }
 532
 533                 name[2] = 'L';
 534                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 535                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 536                         status = acpi_evaluate_reference(tz->device->handle,
 537                                                 name, NULL, &devices);
 538                         if (ACPI_FAILURE(status)) {
 539                                 printk(KERN_WARNING PREFIX
 540                                         "Invalid active%d threshold\n", i);
 541                                 tz->trips.active[i].flags.valid = 0;
 542                         }
 543                         else
 544                                 tz->trips.active[i].flags.valid = 1;
 545
 546                         if (memcmp(&tz->trips.active[i].devices, &devices,
 547                                         sizeof(struct acpi_handle_list))) {
 548                                 memcpy(&tz->trips.active[i].devices, &devices,
 549                                         sizeof(struct acpi_handle_list));
 550                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 551                         }
 552                 }
 553                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 554                         if (valid != tz->trips.active[i].flags.valid)
 555                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 556
 557                 if (!tz->trips.active[i].flags.valid)
 558                         break;
 559         }
 560
 561         if (flag & ACPI_TRIPS_DEVICES) {
 562                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 563                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 564                                                 NULL, &devices);
 565                 if (memcmp(&tz->devices, &devices,
 566                                 sizeof(struct acpi_handle_list))) {
 567                         memcpy(&tz->devices, &devices,
 568                                 sizeof(struct acpi_handle_list));
 569                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 570                 }
 571         }
 572
 573         return 0;
 574 }
 575
 576 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 577 {
 578         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 579
 580         if (ret)
 581                 return ret;
 582
 583         valid = tz->trips.critical.flags.valid |
 584                 tz->trips.hot.flags.valid |
 585                 tz->trips.passive.flags.valid;
 586
 587         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 588                 valid |= tz->trips.active[i].flags.valid;
 589
 590         if (!valid) {
 591                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 592                 return -ENODEV;
 593         }
 594         return 0;
 595 }
 596
 597 static void acpi_thermal_check(void *data)
 598 {
 599         struct acpi_thermal *tz = data;
 600
 601         thermal_zone_device_update(tz->thermal_zone);
 602 }
 603
 604 /* sys I/F for generic thermal sysfs support */
 605 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 606
 607 static int thermal_get_temp(struct thermal_zone_device *thermal,
 608                             unsigned long *temp)
 609 {
 610         struct acpi_thermal *tz = thermal->devdata;
 611         int result;
 612
 613         if (!tz)
 614                 return -EINVAL;
 615
 616         result = acpi_thermal_get_temperature(tz);
 617         if (result)
 618                 return result;
 619
 620         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 621         return 0;
 622 }
 623
 624 static const char enabled[] = "kernel";
 625 static const char disabled[] = "user";
 626 static int thermal_get_mode(struct thermal_zone_device *thermal,
 627                                 enum thermal_device_mode *mode)
 628 {
 629         struct acpi_thermal *tz = thermal->devdata;
 630
 631         if (!tz)
 632                 return -EINVAL;
 633
 634         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 635                 THERMAL_DEVICE_DISABLED;
 636
 637         return 0;
 638 }
 639
 640 static int thermal_set_mode(struct thermal_zone_device *thermal,
 641                                 enum thermal_device_mode mode)
 642 {
 643         struct acpi_thermal *tz = thermal->devdata;
 644         int enable;
 645
 646         if (!tz)
 647                 return -EINVAL;
 648
 649         /*
 650          * enable/disable thermal management from ACPI thermal driver
 651          */
 652         if (mode == THERMAL_DEVICE_ENABLED)
 653                 enable = 1;
 654         else if (mode == THERMAL_DEVICE_DISABLED)
 655                 enable = 0;
 656         else
 657                 return -EINVAL;
 658
 659         if (enable != tz->tz_enabled) {
 660                 tz->tz_enabled = enable;
 661                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 662                         "%s ACPI thermal control\n",
 663                         tz->tz_enabled ? enabled : disabled));
 664                 acpi_thermal_check(tz);
 665         }
 666         return 0;
 667 }
 668
 669 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 670                                  int trip, enum thermal_trip_type *type)
 671 {
 672         struct acpi_thermal *tz = thermal->devdata;
 673         int i;
 674
 675         if (!tz || trip < 0)
 676                 return -EINVAL;
 677
 678         if (tz->trips.critical.flags.valid) {
 679                 if (!trip) {
 680                         *type = THERMAL_TRIP_CRITICAL;
 681                         return 0;
 682                 }
 683                 trip--;
 684         }
 685
 686         if (tz->trips.hot.flags.valid) {
 687                 if (!trip) {
 688                         *type = THERMAL_TRIP_HOT;
 689                         return 0;
 690                 }
 691                 trip--;
 692         }
 693
 694         if (tz->trips.passive.flags.valid) {
 695                 if (!trip) {
 696                         *type = THERMAL_TRIP_PASSIVE;
 697                         return 0;
 698                 }
 699                 trip--;
 700         }
 701
 702         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 703                 tz->trips.active[i].flags.valid; i++) {
 704                 if (!trip) {
 705                         *type = THERMAL_TRIP_ACTIVE;
 706                         return 0;
 707                 }
 708                 trip--;
 709         }
 710
 711         return -EINVAL;
 712 }
 713
 714 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 715                                  int trip, unsigned long *temp)
 716 {
 717         struct acpi_thermal *tz = thermal->devdata;
 718         int i;
 719
 720         if (!tz || trip < 0)
 721                 return -EINVAL;
 722
 723         if (tz->trips.critical.flags.valid) {
 724                 if (!trip) {
 725                         *temp = KELVIN_TO_MILLICELSIUS(
 726                                 tz->trips.critical.temperature,
 727                                 tz->kelvin_offset);
 728                         return 0;
 729                 }
 730                 trip--;
 731         }
 732
 733         if (tz->trips.hot.flags.valid) {
 734                 if (!trip) {
 735                         *temp = KELVIN_TO_MILLICELSIUS(
 736                                 tz->trips.hot.temperature,
 737                                 tz->kelvin_offset);
 738                         return 0;
 739                 }
 740                 trip--;
 741         }
 742
 743         if (tz->trips.passive.flags.valid) {
 744                 if (!trip) {
 745                         *temp = KELVIN_TO_MILLICELSIUS(
 746                                 tz->trips.passive.temperature,
 747                                 tz->kelvin_offset);
 748                         return 0;
 749                 }
 750                 trip--;
 751         }
 752
 753         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 754                 tz->trips.active[i].flags.valid; i++) {
 755                 if (!trip) {
 756                         *temp = KELVIN_TO_MILLICELSIUS(
 757                                 tz->trips.active[i].temperature,
 758                                 tz->kelvin_offset);
 759                         return 0;
 760                 }
 761                 trip--;
 762         }
 763
 764         return -EINVAL;
 765 }
 766
 767 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 768                                 unsigned long *temperature) {
 769         struct acpi_thermal *tz = thermal->devdata;
 770
 771         if (tz->trips.critical.flags.valid) {
 772                 *temperature = KELVIN_TO_MILLICELSIUS(
 773                                 tz->trips.critical.temperature,
 774                                 tz->kelvin_offset);
 775                 return 0;
 776         } else
 777                 return -EINVAL;
 778 }
 779
 780 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 781                            enum thermal_trip_type trip_type)
 782 {
 783         u8 type = 0;
 784         struct acpi_thermal *tz = thermal->devdata;
 785
 786         if (trip_type == THERMAL_TRIP_CRITICAL)
 787                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 788         else if (trip_type == THERMAL_TRIP_HOT)
 789                 type = ACPI_THERMAL_NOTIFY_HOT;
 790         else
 791                 return 0;
 792
 793         acpi_bus_generate_proc_event(tz->device, type, 1);
 794         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 795                                         dev_name(&tz->device->dev), type, 1);
 796
 797         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 798                 return 1;
 799
 800         return 0;
 801 }
 802
 803 typedef int (*cb)(struct thermal_zone_device *, int,
 804                   struct thermal_cooling_device *);
 805 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 806                                         struct thermal_cooling_device *cdev,
 807                                         cb action)
 808 {
 809         struct acpi_device *device = cdev->devdata;
 810         struct acpi_thermal *tz = thermal->devdata;
 811         struct acpi_device *dev;
 812         acpi_status status;
 813         acpi_handle handle;
 814         int i;
 815         int j;
 816         int trip = -1;
 817         int result = 0;
 818
 819         if (tz->trips.critical.flags.valid)
 820                 trip++;
 821
 822         if (tz->trips.hot.flags.valid)
 823                 trip++;
 824
 825         if (tz->trips.passive.flags.valid) {
 826                 trip++;
 827                 for (i = 0; i < tz->trips.passive.devices.count;
 828                     i++) {
 829                         handle = tz->trips.passive.devices.handles[i];
 830                         status = acpi_bus_get_device(handle, &dev);
 831                         if (ACPI_SUCCESS(status) && (dev == device)) {
 832                                 result = action(thermal, trip, cdev);
 833                                 if (result)
 834                                         goto failed;
 835                         }
 836                 }
 837         }
 838
 839         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 840                 if (!tz->trips.active[i].flags.valid)
 841                         break;
 842                 trip++;
 843                 for (j = 0;
 844                     j < tz->trips.active[i].devices.count;
 845                     j++) {
 846                         handle = tz->trips.active[i].devices.handles[j];
 847                         status = acpi_bus_get_device(handle, &dev);
 848                         if (ACPI_SUCCESS(status) && (dev == device)) {
 849                                 result = action(thermal, trip, cdev);
 850                                 if (result)
 851                                         goto failed;
 852                         }
 853                 }
 854         }
 855
 856         for (i = 0; i < tz->devices.count; i++) {
 857                 handle = tz->devices.handles[i];
 858                 status = acpi_bus_get_device(handle, &dev);
 859                 if (ACPI_SUCCESS(status) && (dev == device)) {
 860                         result = action(thermal, -1, cdev);
 861                         if (result)
 862                                 goto failed;
 863                 }
 864         }
 865
 866 failed:
 867         return result;
 868 }
 869
 870 static int
 871 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 872                                         struct thermal_cooling_device *cdev)
 873 {
 874         return acpi_thermal_cooling_device_cb(thermal, cdev,
 875                                 thermal_zone_bind_cooling_device);
 876 }
 877
 878 static int
 879 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 880                                         struct thermal_cooling_device *cdev)
 881 {
 882         return acpi_thermal_cooling_device_cb(thermal, cdev,
 883                                 thermal_zone_unbind_cooling_device);
 884 }
 885
 886 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 887         .bind = acpi_thermal_bind_cooling_device,
 888         .unbind = acpi_thermal_unbind_cooling_device,
 889         .get_temp = thermal_get_temp,
 890         .get_mode = thermal_get_mode,
 891         .set_mode = thermal_set_mode,
 892         .get_trip_type = thermal_get_trip_type,
 893         .get_trip_temp = thermal_get_trip_temp,
 894         .get_crit_temp = thermal_get_crit_temp,
 895         .notify = thermal_notify,
 896 };
 897
 898 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 899 {
 900         int trips = 0;
 901         int result;
 902         acpi_status status;
 903         int i;
 904
 905         if (tz->trips.critical.flags.valid)
 906                 trips++;
 907
 908         if (tz->trips.hot.flags.valid)
 909                 trips++;
 910
 911         if (tz->trips.passive.flags.valid)
 912                 trips++;
 913
 914         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 915                         tz->trips.active[i].flags.valid; i++, trips++);
 916
 917         if (tz->trips.passive.flags.valid)
 918                 tz->thermal_zone =
 919                         thermal_zone_device_register("acpitz", trips, tz,
 920                                                      &acpi_thermal_zone_ops,
 921                                                      tz->trips.passive.tc1,
 922                                                      tz->trips.passive.tc2,
 923                                                      tz->trips.passive.tsp*100,
 924                                                      tz->polling_frequency*100);
 925         else
 926                 tz->thermal_zone =
 927                         thermal_zone_device_register("acpitz", trips, tz,
 928                                                      &acpi_thermal_zone_ops,
 929                                                      0, 0, 0,
 930                                                      tz->polling_frequency*100);
 931         if (IS_ERR(tz->thermal_zone))
 932                 return -ENODEV;
 933
 934         result = sysfs_create_link(&tz->device->dev.kobj,
 935                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 936         if (result)
 937                 return result;
 938
 939         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 940                                    &tz->device->dev.kobj, "device");
 941         if (result)
 942                 return result;
 943
 944         status = acpi_attach_data(tz->device->handle,
 945                                   acpi_bus_private_data_handler,
 946                                   tz->thermal_zone);
 947         if (ACPI_FAILURE(status)) {
 948                 printk(KERN_ERR PREFIX
 949                                 "Error attaching device data\n");
 950                 return -ENODEV;
 951         }
 952
 953         tz->tz_enabled = 1;
 954
 955         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 956                  tz->thermal_zone->id);
 957         return 0;
 958 }
 959
 960 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 961 {
 962         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 963         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 964         thermal_zone_device_unregister(tz->thermal_zone);
 965         tz->thermal_zone = NULL;
 966         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 967 }
 968
 969
 970 /* --------------------------------------------------------------------------
 971                               FS Interface (/proc)
 972    -------------------------------------------------------------------------- */
 973
 974 static struct proc_dir_entry *acpi_thermal_dir;
 975
 976 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 977 {
 978         struct acpi_thermal *tz = seq->private;
 979
 980
 981         if (!tz)
 982                 goto end;
 983
 984         seq_puts(seq, "state:                   ");
 985
 986         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 987             && !tz->state.active)
 988                 seq_puts(seq, "ok\n");
 989         else {
 990                 if (tz->state.critical)
 991                         seq_puts(seq, "critical ");
 992                 if (tz->state.hot)
 993                         seq_puts(seq, "hot ");
 994                 if (tz->state.passive)
 995                         seq_puts(seq, "passive ");
 996                 if (tz->state.active)
 997                         seq_printf(seq, "active[%d]", tz->state.active_index);
 998                 seq_puts(seq, "\n");
 999         }
1000
1001       end:
1002         return 0;
1003 }
1004
1005 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1006 {
1007         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1008 }
1009
1010 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1011 {
1012         int result = 0;
1013         struct acpi_thermal *tz = seq->private;
1014
1015
1016         if (!tz)
1017                 goto end;
1018
1019         result = acpi_thermal_get_temperature(tz);
1020         if (result)
1021                 goto end;
1022
1023         seq_printf(seq, "temperature:             %ld C\n",
1024                    KELVIN_TO_CELSIUS(tz->temperature));
1025
1026       end:
1027         return 0;
1028 }
1029
1030 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1031 {
1032         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1033 }
1034
1035 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1036 {
1037         struct acpi_thermal *tz = seq->private;
1038         struct acpi_device *device;
1039         acpi_status status;
1040
1041         int i = 0;
1042         int j = 0;
1043
1044
1045         if (!tz)
1046                 goto end;
1047
1048         if (tz->trips.critical.flags.valid)
1049                 seq_printf(seq, "critical (S5):           %ld C%s",
1050                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1051                            nocrt ? " <disabled>\n" : "\n");
1052
1053         if (tz->trips.hot.flags.valid)
1054                 seq_printf(seq, "hot (S4):                %ld C%s",
1055                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1056                            nocrt ? " <disabled>\n" : "\n");
1057
1058         if (tz->trips.passive.flags.valid) {
1059                 seq_printf(seq,
1060                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1061                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1062                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1063                            tz->trips.passive.tsp);
1064                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1065                         status = acpi_bus_get_device(tz->trips.passive.devices.
1066                                                      handles[j], &device);
1067                         seq_printf(seq, "%4.4s ", status ? "" :
1068                                    acpi_device_bid(device));
1069                 }
1070                 seq_puts(seq, "\n");
1071         } else {
1072                 seq_printf(seq, "passive (forced):");
1073                 if (tz->thermal_zone->forced_passive)
1074                         seq_printf(seq, "        %i C\n",
1075                                    tz->thermal_zone->forced_passive / 1000);
1076                 else
1077                         seq_printf(seq, "<not set>\n");
1078         }
1079
1080         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1081                 if (!(tz->trips.active[i].flags.valid))
1082                         break;
1083                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1084                            i,
1085                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1086                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1087                         status = acpi_bus_get_device(tz->trips.active[i].
1088                                                      devices.handles[j],
1089                                                      &device);
1090                         seq_printf(seq, "%4.4s ", status ? "" :
1091                                    acpi_device_bid(device));
1092                 }
1093                 seq_puts(seq, "\n");
1094         }
1095
1096       end:
1097         return 0;
1098 }
1099
1100 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1101 {
1102         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1103 }
1104
1105 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1106 {
1107         struct acpi_thermal *tz = seq->private;
1108
1109
1110         if (!tz)
1111                 goto end;
1112
1113         if (!tz->flags.cooling_mode)
1114                 seq_puts(seq, "<setting not supported>\n");
1115         else
1116                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1117
1118       end:
1119         return 0;
1120 }
1121
1122 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1123 {
1124         return single_open(file, acpi_thermal_cooling_seq_show,
1125                            PDE(inode)->data);
1126 }
1127
1128 static ssize_t
1129 acpi_thermal_write_cooling_mode(struct file *file,
1130                                 const char __user * buffer,
1131                                 size_t count, loff_t * ppos)
1132 {
1133         struct seq_file *m = file->private_data;
1134         struct acpi_thermal *tz = m->private;
1135         int result = 0;
1136         char mode_string[12] = { '\0' };
1137
1138
1139         if (!tz || (count > sizeof(mode_string) - 1))
1140                 return -EINVAL;
1141
1142         if (!tz->flags.cooling_mode)
1143                 return -ENODEV;
1144
1145         if (copy_from_user(mode_string, buffer, count))
1146                 return -EFAULT;
1147
1148         mode_string[count] = '\0';
1149
1150         result = acpi_thermal_set_cooling_mode(tz,
1151                                                simple_strtoul(mode_string, NULL,
1152                                                               0));
1153         if (result)
1154                 return result;
1155
1156         acpi_thermal_check(tz);
1157
1158         return count;
1159 }
1160
1161 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1162 {
1163         struct acpi_thermal *tz = seq->private;
1164
1165
1166         if (!tz)
1167                 goto end;
1168
1169         if (!tz->thermal_zone->polling_delay) {
1170                 seq_puts(seq, "<polling disabled>\n");
1171                 goto end;
1172         }
1173
1174         seq_printf(seq, "polling frequency:       %d seconds\n",
1175                    (tz->thermal_zone->polling_delay / 1000));
1176
1177       end:
1178         return 0;
1179 }
1180
1181 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1182 {
1183         return single_open(file, acpi_thermal_polling_seq_show,
1184                            PDE(inode)->data);
1185 }
1186
1187 static ssize_t
1188 acpi_thermal_write_polling(struct file *file,
1189                            const char __user * buffer,
1190                            size_t count, loff_t * ppos)
1191 {
1192         struct seq_file *m = file->private_data;
1193         struct acpi_thermal *tz = m->private;
1194         int result = 0;
1195         char polling_string[12] = { '\0' };
1196         int seconds = 0;
1197
1198
1199         if (!tz || (count > sizeof(polling_string) - 1))
1200                 return -EINVAL;
1201
1202         if (copy_from_user(polling_string, buffer, count))
1203                 return -EFAULT;
1204
1205         polling_string[count] = '\0';
1206
1207         seconds = simple_strtoul(polling_string, NULL, 0);
1208
1209         result = acpi_thermal_set_polling(tz, seconds);
1210         if (result)
1211                 return result;
1212
1213         acpi_thermal_check(tz);
1214
1215         return count;
1216 }
1217
1218 static int acpi_thermal_add_fs(struct acpi_device *device)
1219 {
1220         struct proc_dir_entry *entry = NULL;
1221
1222
1223         if (!acpi_device_dir(device)) {
1224                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1225                                                      acpi_thermal_dir);
1226                 if (!acpi_device_dir(device))
1227                         return -ENODEV;
1228         }
1229
1230         /* 'state' [R] */
1231         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1232                                  S_IRUGO, acpi_device_dir(device),
1233                                  &acpi_thermal_state_fops,
1234                                  acpi_driver_data(device));
1235         if (!entry)
1236                 return -ENODEV;
1237
1238         /* 'temperature' [R] */
1239         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1240                                  S_IRUGO, acpi_device_dir(device),
1241                                  &acpi_thermal_temp_fops,
1242                                  acpi_driver_data(device));
1243         if (!entry)
1244                 return -ENODEV;
1245
1246         /* 'trip_points' [R] */
1247         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1248                                  S_IRUGO,
1249                                  acpi_device_dir(device),
1250                                  &acpi_thermal_trip_fops,
1251                                  acpi_driver_data(device));
1252         if (!entry)
1253                 return -ENODEV;
1254
1255         /* 'cooling_mode' [R/W] */
1256         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1257                                  S_IFREG | S_IRUGO | S_IWUSR,
1258                                  acpi_device_dir(device),
1259                                  &acpi_thermal_cooling_fops,
1260                                  acpi_driver_data(device));
1261         if (!entry)
1262                 return -ENODEV;
1263
1264         /* 'polling_frequency' [R/W] */
1265         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1266                                  S_IFREG | S_IRUGO | S_IWUSR,
1267                                  acpi_device_dir(device),
1268                                  &acpi_thermal_polling_fops,
1269                                  acpi_driver_data(device));
1270         if (!entry)
1271                 return -ENODEV;
1272         return 0;
1273 }
1274
1275 static int acpi_thermal_remove_fs(struct acpi_device *device)
1276 {
1277
1278         if (acpi_device_dir(device)) {
1279                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1280                                   acpi_device_dir(device));
1281                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1282                                   acpi_device_dir(device));
1283                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1284                                   acpi_device_dir(device));
1285                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1286                                   acpi_device_dir(device));
1287                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1288                                   acpi_device_dir(device));
1289                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1290                 acpi_device_dir(device) = NULL;
1291         }
1292
1293         return 0;
1294 }
1295
1296 /* --------------------------------------------------------------------------
1297                                  Driver Interface
1298    -------------------------------------------------------------------------- */
1299
1300 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1301 {
1302         struct acpi_thermal *tz = acpi_driver_data(device);
1303
1304
1305         if (!tz)
1306                 return;
1307
1308         switch (event) {
1309         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1310                 acpi_thermal_check(tz);
1311                 break;
1312         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1313                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1314                 acpi_thermal_check(tz);
1315                 acpi_bus_generate_proc_event(device, event, 0);
1316                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1317                                                   dev_name(&device->dev), event, 0);
1318                 break;
1319         case ACPI_THERMAL_NOTIFY_DEVICES:
1320                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1321                 acpi_thermal_check(tz);
1322                 acpi_bus_generate_proc_event(device, event, 0);
1323                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1324                                                   dev_name(&device->dev), event, 0);
1325                 break;
1326         default:
1327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1328                                   "Unsupported event [0x%x]\n", event));
1329                 break;
1330         }
1331 }
1332
1333 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1334 {
1335         int result = 0;
1336
1337
1338         if (!tz)
1339                 return -EINVAL;
1340
1341         /* Get temperature [_TMP] (required) */
1342         result = acpi_thermal_get_temperature(tz);
1343         if (result)
1344                 return result;
1345
1346         /* Get trip points [_CRT, _PSV, etc.] (required) */
1347         result = acpi_thermal_get_trip_points(tz);
1348         if (result)
1349                 return result;
1350
1351         /* Set the cooling mode [_SCP] to active cooling (default) */
1352         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1353         if (!result)
1354                 tz->flags.cooling_mode = 1;
1355
1356         /* Get default polling frequency [_TZP] (optional) */
1357         if (tzp)
1358                 tz->polling_frequency = tzp;
1359         else
1360                 acpi_thermal_get_polling_frequency(tz);
1361
1362         return 0;
1363 }
1364
1365 /*
1366  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1367  * handles temperature values with a single decimal place. As a consequence,
1368  * some implementations use an offset of 273.1 and others use an offset of
1369  * 273.2. Try to find out which one is being used, to present the most
1370  * accurate and visually appealing number.
1371  *
1372  * The heuristic below should work for all ACPI thermal zones which have a
1373  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1374  */
1375 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1376 {
1377         if (tz->trips.critical.flags.valid &&
1378             (tz->trips.critical.temperature % 5) == 1)
1379                 tz->kelvin_offset = 2731;
1380         else
1381                 tz->kelvin_offset = 2732;
1382 }
1383
1384 static int acpi_thermal_add(struct acpi_device *device)
1385 {
1386         int result = 0;
1387         struct acpi_thermal *tz = NULL;
1388
1389
1390         if (!device)
1391                 return -EINVAL;
1392
1393         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1394         if (!tz)
1395                 return -ENOMEM;
1396
1397         tz->device = device;
1398         strcpy(tz->name, device->pnp.bus_id);
1399         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1400         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1401         device->driver_data = tz;
1402         mutex_init(&tz->lock);
1403
1404
1405         result = acpi_thermal_get_info(tz);
1406         if (result)
1407                 goto free_memory;
1408
1409         acpi_thermal_guess_offset(tz);
1410
1411         result = acpi_thermal_register_thermal_zone(tz);
1412         if (result)
1413                 goto free_memory;
1414
1415         result = acpi_thermal_add_fs(device);
1416         if (result)
1417                 goto unregister_thermal_zone;
1418
1419         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1420                acpi_device_name(device), acpi_device_bid(device),
1421                KELVIN_TO_CELSIUS(tz->temperature));
1422         goto end;
1423
1424 unregister_thermal_zone:
1425         thermal_zone_device_unregister(tz->thermal_zone);
1426 free_memory:
1427         kfree(tz);
1428 end:
1429         return result;
1430 }
1431
1432 static int acpi_thermal_remove(struct acpi_device *device, int type)
1433 {
1434         struct acpi_thermal *tz = NULL;
1435
1436         if (!device || !acpi_driver_data(device))
1437                 return -EINVAL;
1438
1439         tz = acpi_driver_data(device);
1440
1441         acpi_thermal_remove_fs(device);
1442         acpi_thermal_unregister_thermal_zone(tz);
1443         mutex_destroy(&tz->lock);
1444         kfree(tz);
1445         return 0;
1446 }
1447
1448 static int acpi_thermal_resume(struct acpi_device *device)
1449 {
1450         struct acpi_thermal *tz = NULL;
1451         int i, j, power_state, result;
1452
1453
1454         if (!device || !acpi_driver_data(device))
1455                 return -EINVAL;
1456
1457         tz = acpi_driver_data(device);
1458
1459         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1460                 if (!(&tz->trips.active[i]))
1461                         break;
1462                 if (!tz->trips.active[i].flags.valid)
1463                         break;
1464                 tz->trips.active[i].flags.enabled = 1;
1465                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1466                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1467                             handles[j], &power_state);
1468                         if (result || (power_state != ACPI_STATE_D0)) {
1469                                 tz->trips.active[i].flags.enabled = 0;
1470                                 break;
1471                         }
1472                 }
1473                 tz->state.active |= tz->trips.active[i].flags.enabled;
1474         }
1475
1476         acpi_thermal_check(tz);
1477
1478         return AE_OK;
1479 }
1480
1481 static int thermal_act(const struct dmi_system_id *d) {
1482
1483         if (act == 0) {
1484                 printk(KERN_NOTICE "ACPI: %s detected: "
1485                         "disabling all active thermal trip points\n", d->ident);
1486                 act = -1;
1487         }
1488         return 0;
1489 }
1490 static int thermal_nocrt(const struct dmi_system_id *d) {
1491
1492         printk(KERN_NOTICE "ACPI: %s detected: "
1493                 "disabling all critical thermal trip point actions.\n", d->ident);
1494         nocrt = 1;
1495         return 0;
1496 }
1497 static int thermal_tzp(const struct dmi_system_id *d) {
1498
1499         if (tzp == 0) {
1500                 printk(KERN_NOTICE "ACPI: %s detected: "
1501                         "enabling thermal zone polling\n", d->ident);
1502                 tzp = 300;      /* 300 dS = 30 Seconds */
1503         }
1504         return 0;
1505 }
1506 static int thermal_psv(const struct dmi_system_id *d) {
1507
1508         if (psv == 0) {
1509                 printk(KERN_NOTICE "ACPI: %s detected: "
1510                         "disabling all passive thermal trip points\n", d->ident);
1511                 psv = -1;
1512         }
1513         return 0;
1514 }
1515
1516 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1517         /*
1518          * Award BIOS on this AOpen makes thermal control almost worthless.
1519          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1520          */
1521         {
1522          .callback = thermal_act,
1523          .ident = "AOpen i915GMm-HFS",
1524          .matches = {
1525                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1526                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1527                 },
1528         },
1529         {
1530          .callback = thermal_psv,
1531          .ident = "AOpen i915GMm-HFS",
1532          .matches = {
1533                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1534                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1535                 },
1536         },
1537         {
1538          .callback = thermal_tzp,
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_nocrt,
1547          .ident = "Gigabyte GA-7ZX",
1548          .matches = {
1549                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1550                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1551                 },
1552         },
1553         {}
1554 };
1555
1556 static int __init acpi_thermal_init(void)
1557 {
1558         int result = 0;
1559
1560         dmi_check_system(thermal_dmi_table);
1561
1562         if (off) {
1563                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1564                 return -ENODEV;
1565         }
1566         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1567         if (!acpi_thermal_dir)
1568                 return -ENODEV;
1569
1570         result = acpi_bus_register_driver(&acpi_thermal_driver);
1571         if (result < 0) {
1572                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1573                 return -ENODEV;
1574         }
1575
1576         return 0;
1577 }
1578
1579 static void __exit acpi_thermal_exit(void)
1580 {
1581
1582         acpi_bus_unregister_driver(&acpi_thermal_driver);
1583
1584         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1585
1586         return;
1587 }
1588
1589 module_init(acpi_thermal_init);
1590 module_exit(acpi_thermal_exit);