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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 */
 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.flags.valid = 0;
 384                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 385                                           "No critical threshold\n"));
 386                 } else if (tmp <= 2732) {
 387                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
 388                                "(%llu)\n", tmp);
 389                         tz->trips.critical.flags.valid = 0;
 390                 } else {
 391                         tz->trips.critical.flags.valid = 1;
 392                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 393                                           "Found critical threshold [%lu]\n",
 394                                           tz->trips.critical.temperature));
 395                 }
 396                 if (tz->trips.critical.flags.valid == 1) {
 397                         if (crt == -1) {
 398                                 tz->trips.critical.flags.valid = 0;
 399                         } else if (crt > 0) {
 400                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 401                                 /*
 402                                  * Allow override critical threshold
 403                                  */
 404                                 if (crt_k > tz->trips.critical.temperature)
 405                                         printk(KERN_WARNING PREFIX
 406                                                 "Critical threshold %d C\n", crt);
 407                                 tz->trips.critical.temperature = crt_k;
 408                         }
 409                 }
 410         }
 411
 412         /* Critical Sleep (optional) */
 413         if (flag & ACPI_TRIPS_HOT) {
 414                 status = acpi_evaluate_integer(tz->device->handle,
 415                                 "_HOT", NULL, &tmp);
 416                 if (ACPI_FAILURE(status)) {
 417                         tz->trips.hot.flags.valid = 0;
 418                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 419                                         "No hot threshold\n"));
 420                 } else {
 421                         tz->trips.hot.temperature = tmp;
 422                         tz->trips.hot.flags.valid = 1;
 423                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 424                                         "Found hot threshold [%lu]\n",
 425                                         tz->trips.critical.temperature));
 426                 }
 427         }
 428
 429         /* Passive (optional) */
 430         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 431                 (flag == ACPI_TRIPS_INIT)) {
 432                 valid = tz->trips.passive.flags.valid;
 433                 if (psv == -1) {
 434                         status = AE_SUPPORT;
 435                 } else if (psv > 0) {
 436                         tmp = CELSIUS_TO_KELVIN(psv);
 437                         status = AE_OK;
 438                 } else {
 439                         status = acpi_evaluate_integer(tz->device->handle,
 440                                 "_PSV", NULL, &tmp);
 441                 }
 442
 443                 if (ACPI_FAILURE(status))
 444                         tz->trips.passive.flags.valid = 0;
 445                 else {
 446                         tz->trips.passive.temperature = tmp;
 447                         tz->trips.passive.flags.valid = 1;
 448                         if (flag == ACPI_TRIPS_INIT) {
 449                                 status = acpi_evaluate_integer(
 450                                                 tz->device->handle, "_TC1",
 451                                                 NULL, &tmp);
 452                                 if (ACPI_FAILURE(status))
 453                                         tz->trips.passive.flags.valid = 0;
 454                                 else
 455                                         tz->trips.passive.tc1 = tmp;
 456                                 status = acpi_evaluate_integer(
 457                                                 tz->device->handle, "_TC2",
 458                                                 NULL, &tmp);
 459                                 if (ACPI_FAILURE(status))
 460                                         tz->trips.passive.flags.valid = 0;
 461                                 else
 462                                         tz->trips.passive.tc2 = tmp;
 463                                 status = acpi_evaluate_integer(
 464                                                 tz->device->handle, "_TSP",
 465                                                 NULL, &tmp);
 466                                 if (ACPI_FAILURE(status))
 467                                         tz->trips.passive.flags.valid = 0;
 468                                 else
 469                                         tz->trips.passive.tsp = tmp;
 470                         }
 471                 }
 472         }
 473         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 474                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 475                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 476                                                         NULL, &devices);
 477                 if (ACPI_FAILURE(status)) {
 478                         printk(KERN_WARNING PREFIX
 479                                 "Invalid passive threshold\n");
 480                         tz->trips.passive.flags.valid = 0;
 481                 }
 482                 else
 483                         tz->trips.passive.flags.valid = 1;
 484
 485                 if (memcmp(&tz->trips.passive.devices, &devices,
 486                                 sizeof(struct acpi_handle_list))) {
 487                         memcpy(&tz->trips.passive.devices, &devices,
 488                                 sizeof(struct acpi_handle_list));
 489                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 490                 }
 491         }
 492         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 493                 if (valid != tz->trips.passive.flags.valid)
 494                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 495         }
 496
 497         /* Active (optional) */
 498         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 499                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 500                 valid = tz->trips.active[i].flags.valid;
 501
 502                 if (act == -1)
 503                         break; /* disable all active trip points */
 504
 505                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 506                         tz->trips.active[i].flags.valid)) {
 507                         status = acpi_evaluate_integer(tz->device->handle,
 508                                                         name, NULL, &tmp);
 509                         if (ACPI_FAILURE(status)) {
 510                                 tz->trips.active[i].flags.valid = 0;
 511                                 if (i == 0)
 512                                         break;
 513                                 if (act <= 0)
 514                                         break;
 515                                 if (i == 1)
 516                                         tz->trips.active[0].temperature =
 517                                                 CELSIUS_TO_KELVIN(act);
 518                                 else
 519                                         /*
 520                                          * Don't allow override higher than
 521                                          * the next higher trip point
 522                                          */
 523                                         tz->trips.active[i - 1].temperature =
 524                                                 (tz->trips.active[i - 2].temperature <
 525                                                 CELSIUS_TO_KELVIN(act) ?
 526                                                 tz->trips.active[i - 2].temperature :
 527                                                 CELSIUS_TO_KELVIN(act));
 528                                 break;
 529                         } else {
 530                                 tz->trips.active[i].temperature = tmp;
 531                                 tz->trips.active[i].flags.valid = 1;
 532                         }
 533                 }
 534
 535                 name[2] = 'L';
 536                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 537                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 538                         status = acpi_evaluate_reference(tz->device->handle,
 539                                                 name, NULL, &devices);
 540                         if (ACPI_FAILURE(status)) {
 541                                 printk(KERN_WARNING PREFIX
 542                                         "Invalid active%d threshold\n", i);
 543                                 tz->trips.active[i].flags.valid = 0;
 544                         }
 545                         else
 546                                 tz->trips.active[i].flags.valid = 1;
 547
 548                         if (memcmp(&tz->trips.active[i].devices, &devices,
 549                                         sizeof(struct acpi_handle_list))) {
 550                                 memcpy(&tz->trips.active[i].devices, &devices,
 551                                         sizeof(struct acpi_handle_list));
 552                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 553                         }
 554                 }
 555                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 556                         if (valid != tz->trips.active[i].flags.valid)
 557                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 558
 559                 if (!tz->trips.active[i].flags.valid)
 560                         break;
 561         }
 562
 563         if (flag & ACPI_TRIPS_DEVICES) {
 564                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 565                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 566                                                 NULL, &devices);
 567                 if (memcmp(&tz->devices, &devices,
 568                                 sizeof(struct acpi_handle_list))) {
 569                         memcpy(&tz->devices, &devices,
 570                                 sizeof(struct acpi_handle_list));
 571                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 572                 }
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 579 {
 580         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 581
 582         if (ret)
 583                 return ret;
 584
 585         valid = tz->trips.critical.flags.valid |
 586                 tz->trips.hot.flags.valid |
 587                 tz->trips.passive.flags.valid;
 588
 589         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 590                 valid |= tz->trips.active[i].flags.valid;
 591
 592         if (!valid) {
 593                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
 594                 return -ENODEV;
 595         }
 596         return 0;
 597 }
 598
 599 static void acpi_thermal_check(void *data)
 600 {
 601         struct acpi_thermal *tz = data;
 602
 603         thermal_zone_device_update(tz->thermal_zone);
 604 }
 605
 606 /* sys I/F for generic thermal sysfs support */
 607 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 608
 609 static int thermal_get_temp(struct thermal_zone_device *thermal,
 610                             unsigned long *temp)
 611 {
 612         struct acpi_thermal *tz = thermal->devdata;
 613         int result;
 614
 615         if (!tz)
 616                 return -EINVAL;
 617
 618         result = acpi_thermal_get_temperature(tz);
 619         if (result)
 620                 return result;
 621
 622         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 623         return 0;
 624 }
 625
 626 static const char enabled[] = "kernel";
 627 static const char disabled[] = "user";
 628 static int thermal_get_mode(struct thermal_zone_device *thermal,
 629                                 enum thermal_device_mode *mode)
 630 {
 631         struct acpi_thermal *tz = thermal->devdata;
 632
 633         if (!tz)
 634                 return -EINVAL;
 635
 636         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 637                 THERMAL_DEVICE_DISABLED;
 638
 639         return 0;
 640 }
 641
 642 static int thermal_set_mode(struct thermal_zone_device *thermal,
 643                                 enum thermal_device_mode mode)
 644 {
 645         struct acpi_thermal *tz = thermal->devdata;
 646         int enable;
 647
 648         if (!tz)
 649                 return -EINVAL;
 650
 651         /*
 652          * enable/disable thermal management from ACPI thermal driver
 653          */
 654         if (mode == THERMAL_DEVICE_ENABLED)
 655                 enable = 1;
 656         else if (mode == THERMAL_DEVICE_DISABLED)
 657                 enable = 0;
 658         else
 659                 return -EINVAL;
 660
 661         if (enable != tz->tz_enabled) {
 662                 tz->tz_enabled = enable;
 663                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 664                         "%s ACPI thermal control\n",
 665                         tz->tz_enabled ? enabled : disabled));
 666                 acpi_thermal_check(tz);
 667         }
 668         return 0;
 669 }
 670
 671 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 672                                  int trip, enum thermal_trip_type *type)
 673 {
 674         struct acpi_thermal *tz = thermal->devdata;
 675         int i;
 676
 677         if (!tz || trip < 0)
 678                 return -EINVAL;
 679
 680         if (tz->trips.critical.flags.valid) {
 681                 if (!trip) {
 682                         *type = THERMAL_TRIP_CRITICAL;
 683                         return 0;
 684                 }
 685                 trip--;
 686         }
 687
 688         if (tz->trips.hot.flags.valid) {
 689                 if (!trip) {
 690                         *type = THERMAL_TRIP_HOT;
 691                         return 0;
 692                 }
 693                 trip--;
 694         }
 695
 696         if (tz->trips.passive.flags.valid) {
 697                 if (!trip) {
 698                         *type = THERMAL_TRIP_PASSIVE;
 699                         return 0;
 700                 }
 701                 trip--;
 702         }
 703
 704         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 705                 tz->trips.active[i].flags.valid; i++) {
 706                 if (!trip) {
 707                         *type = THERMAL_TRIP_ACTIVE;
 708                         return 0;
 709                 }
 710                 trip--;
 711         }
 712
 713         return -EINVAL;
 714 }
 715
 716 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 717                                  int trip, unsigned long *temp)
 718 {
 719         struct acpi_thermal *tz = thermal->devdata;
 720         int i;
 721
 722         if (!tz || trip < 0)
 723                 return -EINVAL;
 724
 725         if (tz->trips.critical.flags.valid) {
 726                 if (!trip) {
 727                         *temp = KELVIN_TO_MILLICELSIUS(
 728                                 tz->trips.critical.temperature,
 729                                 tz->kelvin_offset);
 730                         return 0;
 731                 }
 732                 trip--;
 733         }
 734
 735         if (tz->trips.hot.flags.valid) {
 736                 if (!trip) {
 737                         *temp = KELVIN_TO_MILLICELSIUS(
 738                                 tz->trips.hot.temperature,
 739                                 tz->kelvin_offset);
 740                         return 0;
 741                 }
 742                 trip--;
 743         }
 744
 745         if (tz->trips.passive.flags.valid) {
 746                 if (!trip) {
 747                         *temp = KELVIN_TO_MILLICELSIUS(
 748                                 tz->trips.passive.temperature,
 749                                 tz->kelvin_offset);
 750                         return 0;
 751                 }
 752                 trip--;
 753         }
 754
 755         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 756                 tz->trips.active[i].flags.valid; i++) {
 757                 if (!trip) {
 758                         *temp = KELVIN_TO_MILLICELSIUS(
 759                                 tz->trips.active[i].temperature,
 760                                 tz->kelvin_offset);
 761                         return 0;
 762                 }
 763                 trip--;
 764         }
 765
 766         return -EINVAL;
 767 }
 768
 769 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 770                                 unsigned long *temperature) {
 771         struct acpi_thermal *tz = thermal->devdata;
 772
 773         if (tz->trips.critical.flags.valid) {
 774                 *temperature = KELVIN_TO_MILLICELSIUS(
 775                                 tz->trips.critical.temperature,
 776                                 tz->kelvin_offset);
 777                 return 0;
 778         } else
 779                 return -EINVAL;
 780 }
 781
 782 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 783                            enum thermal_trip_type trip_type)
 784 {
 785         u8 type = 0;
 786         struct acpi_thermal *tz = thermal->devdata;
 787
 788         if (trip_type == THERMAL_TRIP_CRITICAL)
 789                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 790         else if (trip_type == THERMAL_TRIP_HOT)
 791                 type = ACPI_THERMAL_NOTIFY_HOT;
 792         else
 793                 return 0;
 794
 795         acpi_bus_generate_proc_event(tz->device, type, 1);
 796         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 797                                         dev_name(&tz->device->dev), type, 1);
 798
 799         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 800                 return 1;
 801
 802         return 0;
 803 }
 804
 805 typedef int (*cb)(struct thermal_zone_device *, int,
 806                   struct thermal_cooling_device *);
 807 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 808                                         struct thermal_cooling_device *cdev,
 809                                         cb action)
 810 {
 811         struct acpi_device *device = cdev->devdata;
 812         struct acpi_thermal *tz = thermal->devdata;
 813         struct acpi_device *dev;
 814         acpi_status status;
 815         acpi_handle handle;
 816         int i;
 817         int j;
 818         int trip = -1;
 819         int result = 0;
 820
 821         if (tz->trips.critical.flags.valid)
 822                 trip++;
 823
 824         if (tz->trips.hot.flags.valid)
 825                 trip++;
 826
 827         if (tz->trips.passive.flags.valid) {
 828                 trip++;
 829                 for (i = 0; i < tz->trips.passive.devices.count;
 830                     i++) {
 831                         handle = tz->trips.passive.devices.handles[i];
 832                         status = acpi_bus_get_device(handle, &dev);
 833                         if (ACPI_SUCCESS(status) && (dev == device)) {
 834                                 result = action(thermal, trip, cdev);
 835                                 if (result)
 836                                         goto failed;
 837                         }
 838                 }
 839         }
 840
 841         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 842                 if (!tz->trips.active[i].flags.valid)
 843                         break;
 844                 trip++;
 845                 for (j = 0;
 846                     j < tz->trips.active[i].devices.count;
 847                     j++) {
 848                         handle = tz->trips.active[i].devices.handles[j];
 849                         status = acpi_bus_get_device(handle, &dev);
 850                         if (ACPI_SUCCESS(status) && (dev == device)) {
 851                                 result = action(thermal, trip, cdev);
 852                                 if (result)
 853                                         goto failed;
 854                         }
 855                 }
 856         }
 857
 858         for (i = 0; i < tz->devices.count; i++) {
 859                 handle = tz->devices.handles[i];
 860                 status = acpi_bus_get_device(handle, &dev);
 861                 if (ACPI_SUCCESS(status) && (dev == device)) {
 862                         result = action(thermal, -1, cdev);
 863                         if (result)
 864                                 goto failed;
 865                 }
 866         }
 867
 868 failed:
 869         return result;
 870 }
 871
 872 static int
 873 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 874                                         struct thermal_cooling_device *cdev)
 875 {
 876         return acpi_thermal_cooling_device_cb(thermal, cdev,
 877                                 thermal_zone_bind_cooling_device);
 878 }
 879
 880 static int
 881 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 882                                         struct thermal_cooling_device *cdev)
 883 {
 884         return acpi_thermal_cooling_device_cb(thermal, cdev,
 885                                 thermal_zone_unbind_cooling_device);
 886 }
 887
 888 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 889         .bind = acpi_thermal_bind_cooling_device,
 890         .unbind = acpi_thermal_unbind_cooling_device,
 891         .get_temp = thermal_get_temp,
 892         .get_mode = thermal_get_mode,
 893         .set_mode = thermal_set_mode,
 894         .get_trip_type = thermal_get_trip_type,
 895         .get_trip_temp = thermal_get_trip_temp,
 896         .get_crit_temp = thermal_get_crit_temp,
 897         .notify = thermal_notify,
 898 };
 899
 900 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 901 {
 902         int trips = 0;
 903         int result;
 904         acpi_status status;
 905         int i;
 906
 907         if (tz->trips.critical.flags.valid)
 908                 trips++;
 909
 910         if (tz->trips.hot.flags.valid)
 911                 trips++;
 912
 913         if (tz->trips.passive.flags.valid)
 914                 trips++;
 915
 916         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 917                         tz->trips.active[i].flags.valid; i++, trips++);
 918
 919         if (tz->trips.passive.flags.valid)
 920                 tz->thermal_zone =
 921                         thermal_zone_device_register("acpitz", trips, tz,
 922                                                      &acpi_thermal_zone_ops,
 923                                                      tz->trips.passive.tc1,
 924                                                      tz->trips.passive.tc2,
 925                                                      tz->trips.passive.tsp*100,
 926                                                      tz->polling_frequency*100);
 927         else
 928                 tz->thermal_zone =
 929                         thermal_zone_device_register("acpitz", trips, tz,
 930                                                      &acpi_thermal_zone_ops,
 931                                                      0, 0, 0,
 932                                                      tz->polling_frequency*100);
 933         if (IS_ERR(tz->thermal_zone))
 934                 return -ENODEV;
 935
 936         result = sysfs_create_link(&tz->device->dev.kobj,
 937                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 938         if (result)
 939                 return result;
 940
 941         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 942                                    &tz->device->dev.kobj, "device");
 943         if (result)
 944                 return result;
 945
 946         status = acpi_attach_data(tz->device->handle,
 947                                   acpi_bus_private_data_handler,
 948                                   tz->thermal_zone);
 949         if (ACPI_FAILURE(status)) {
 950                 printk(KERN_ERR PREFIX
 951                                 "Error attaching device data\n");
 952                 return -ENODEV;
 953         }
 954
 955         tz->tz_enabled = 1;
 956
 957         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 958                  tz->thermal_zone->id);
 959         return 0;
 960 }
 961
 962 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 963 {
 964         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 965         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 966         thermal_zone_device_unregister(tz->thermal_zone);
 967         tz->thermal_zone = NULL;
 968         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 969 }
 970
 971
 972 /* --------------------------------------------------------------------------
 973                               FS Interface (/proc)
 974    -------------------------------------------------------------------------- */
 975
 976 static struct proc_dir_entry *acpi_thermal_dir;
 977
 978 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 979 {
 980         struct acpi_thermal *tz = seq->private;
 981
 982
 983         if (!tz)
 984                 goto end;
 985
 986         seq_puts(seq, "state:                   ");
 987
 988         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 989             && !tz->state.active)
 990                 seq_puts(seq, "ok\n");
 991         else {
 992                 if (tz->state.critical)
 993                         seq_puts(seq, "critical ");
 994                 if (tz->state.hot)
 995                         seq_puts(seq, "hot ");
 996                 if (tz->state.passive)
 997                         seq_puts(seq, "passive ");
 998                 if (tz->state.active)
 999                         seq_printf(seq, "active[%d]", tz->state.active_index);
1000                 seq_puts(seq, "\n");
1001         }
1002
1003       end:
1004         return 0;
1005 }
1006
1007 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1008 {
1009         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1010 }
1011
1012 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1013 {
1014         int result = 0;
1015         struct acpi_thermal *tz = seq->private;
1016
1017
1018         if (!tz)
1019                 goto end;
1020
1021         result = acpi_thermal_get_temperature(tz);
1022         if (result)
1023                 goto end;
1024
1025         seq_printf(seq, "temperature:             %ld C\n",
1026                    KELVIN_TO_CELSIUS(tz->temperature));
1027
1028       end:
1029         return 0;
1030 }
1031
1032 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1033 {
1034         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1035 }
1036
1037 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1038 {
1039         struct acpi_thermal *tz = seq->private;
1040         struct acpi_device *device;
1041         acpi_status status;
1042
1043         int i = 0;
1044         int j = 0;
1045
1046
1047         if (!tz)
1048                 goto end;
1049
1050         if (tz->trips.critical.flags.valid)
1051                 seq_printf(seq, "critical (S5):           %ld C%s",
1052                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1053                            nocrt ? " <disabled>\n" : "\n");
1054
1055         if (tz->trips.hot.flags.valid)
1056                 seq_printf(seq, "hot (S4):                %ld C%s",
1057                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1058                            nocrt ? " <disabled>\n" : "\n");
1059
1060         if (tz->trips.passive.flags.valid) {
1061                 seq_printf(seq,
1062                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1063                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1064                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1065                            tz->trips.passive.tsp);
1066                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1067                         status = acpi_bus_get_device(tz->trips.passive.devices.
1068                                                      handles[j], &device);
1069                         seq_printf(seq, "%4.4s ", status ? "" :
1070                                    acpi_device_bid(device));
1071                 }
1072                 seq_puts(seq, "\n");
1073         } else {
1074                 seq_printf(seq, "passive (forced):");
1075                 if (tz->thermal_zone->forced_passive)
1076                         seq_printf(seq, "        %i C\n",
1077                                    tz->thermal_zone->forced_passive / 1000);
1078                 else
1079                         seq_printf(seq, "<not set>\n");
1080         }
1081
1082         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1083                 if (!(tz->trips.active[i].flags.valid))
1084                         break;
1085                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1086                            i,
1087                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1088                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1089                         status = acpi_bus_get_device(tz->trips.active[i].
1090                                                      devices.handles[j],
1091                                                      &device);
1092                         seq_printf(seq, "%4.4s ", status ? "" :
1093                                    acpi_device_bid(device));
1094                 }
1095                 seq_puts(seq, "\n");
1096         }
1097
1098       end:
1099         return 0;
1100 }
1101
1102 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1103 {
1104         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1105 }
1106
1107 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1108 {
1109         struct acpi_thermal *tz = seq->private;
1110
1111
1112         if (!tz)
1113                 goto end;
1114
1115         if (!tz->flags.cooling_mode)
1116                 seq_puts(seq, "<setting not supported>\n");
1117         else
1118                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1119
1120       end:
1121         return 0;
1122 }
1123
1124 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1125 {
1126         return single_open(file, acpi_thermal_cooling_seq_show,
1127                            PDE(inode)->data);
1128 }
1129
1130 static ssize_t
1131 acpi_thermal_write_cooling_mode(struct file *file,
1132                                 const char __user * buffer,
1133                                 size_t count, loff_t * ppos)
1134 {
1135         struct seq_file *m = file->private_data;
1136         struct acpi_thermal *tz = m->private;
1137         int result = 0;
1138         char mode_string[12] = { '\0' };
1139
1140
1141         if (!tz || (count > sizeof(mode_string) - 1))
1142                 return -EINVAL;
1143
1144         if (!tz->flags.cooling_mode)
1145                 return -ENODEV;
1146
1147         if (copy_from_user(mode_string, buffer, count))
1148                 return -EFAULT;
1149
1150         mode_string[count] = '\0';
1151
1152         result = acpi_thermal_set_cooling_mode(tz,
1153                                                simple_strtoul(mode_string, NULL,
1154                                                               0));
1155         if (result)
1156                 return result;
1157
1158         acpi_thermal_check(tz);
1159
1160         return count;
1161 }
1162
1163 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1164 {
1165         struct acpi_thermal *tz = seq->private;
1166
1167
1168         if (!tz)
1169                 goto end;
1170
1171         if (!tz->thermal_zone->polling_delay) {
1172                 seq_puts(seq, "<polling disabled>\n");
1173                 goto end;
1174         }
1175
1176         seq_printf(seq, "polling frequency:       %d seconds\n",
1177                    (tz->thermal_zone->polling_delay / 1000));
1178
1179       end:
1180         return 0;
1181 }
1182
1183 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1184 {
1185         return single_open(file, acpi_thermal_polling_seq_show,
1186                            PDE(inode)->data);
1187 }
1188
1189 static ssize_t
1190 acpi_thermal_write_polling(struct file *file,
1191                            const char __user * buffer,
1192                            size_t count, loff_t * ppos)
1193 {
1194         struct seq_file *m = file->private_data;
1195         struct acpi_thermal *tz = m->private;
1196         int result = 0;
1197         char polling_string[12] = { '\0' };
1198         int seconds = 0;
1199
1200
1201         if (!tz || (count > sizeof(polling_string) - 1))
1202                 return -EINVAL;
1203
1204         if (copy_from_user(polling_string, buffer, count))
1205                 return -EFAULT;
1206
1207         polling_string[count] = '\0';
1208
1209         seconds = simple_strtoul(polling_string, NULL, 0);
1210
1211         result = acpi_thermal_set_polling(tz, seconds);
1212         if (result)
1213                 return result;
1214
1215         acpi_thermal_check(tz);
1216
1217         return count;
1218 }
1219
1220 static int acpi_thermal_add_fs(struct acpi_device *device)
1221 {
1222         struct proc_dir_entry *entry = NULL;
1223
1224
1225         if (!acpi_device_dir(device)) {
1226                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1227                                                      acpi_thermal_dir);
1228                 if (!acpi_device_dir(device))
1229                         return -ENODEV;
1230         }
1231
1232         /* 'state' [R] */
1233         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1234                                  S_IRUGO, acpi_device_dir(device),
1235                                  &acpi_thermal_state_fops,
1236                                  acpi_driver_data(device));
1237         if (!entry)
1238                 return -ENODEV;
1239
1240         /* 'temperature' [R] */
1241         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1242                                  S_IRUGO, acpi_device_dir(device),
1243                                  &acpi_thermal_temp_fops,
1244                                  acpi_driver_data(device));
1245         if (!entry)
1246                 return -ENODEV;
1247
1248         /* 'trip_points' [R] */
1249         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1250                                  S_IRUGO,
1251                                  acpi_device_dir(device),
1252                                  &acpi_thermal_trip_fops,
1253                                  acpi_driver_data(device));
1254         if (!entry)
1255                 return -ENODEV;
1256
1257         /* 'cooling_mode' [R/W] */
1258         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1259                                  S_IFREG | S_IRUGO | S_IWUSR,
1260                                  acpi_device_dir(device),
1261                                  &acpi_thermal_cooling_fops,
1262                                  acpi_driver_data(device));
1263         if (!entry)
1264                 return -ENODEV;
1265
1266         /* 'polling_frequency' [R/W] */
1267         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1268                                  S_IFREG | S_IRUGO | S_IWUSR,
1269                                  acpi_device_dir(device),
1270                                  &acpi_thermal_polling_fops,
1271                                  acpi_driver_data(device));
1272         if (!entry)
1273                 return -ENODEV;
1274         return 0;
1275 }
1276
1277 static int acpi_thermal_remove_fs(struct acpi_device *device)
1278 {
1279
1280         if (acpi_device_dir(device)) {
1281                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1282                                   acpi_device_dir(device));
1283                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1284                                   acpi_device_dir(device));
1285                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1286                                   acpi_device_dir(device));
1287                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1288                                   acpi_device_dir(device));
1289                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1290                                   acpi_device_dir(device));
1291                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1292                 acpi_device_dir(device) = NULL;
1293         }
1294
1295         return 0;
1296 }
1297
1298 /* --------------------------------------------------------------------------
1299                                  Driver Interface
1300    -------------------------------------------------------------------------- */
1301
1302 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1303 {
1304         struct acpi_thermal *tz = acpi_driver_data(device);
1305
1306
1307         if (!tz)
1308                 return;
1309
1310         switch (event) {
1311         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1312                 acpi_thermal_check(tz);
1313                 break;
1314         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1315                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1316                 acpi_thermal_check(tz);
1317                 acpi_bus_generate_proc_event(device, event, 0);
1318                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1319                                                   dev_name(&device->dev), event, 0);
1320                 break;
1321         case ACPI_THERMAL_NOTIFY_DEVICES:
1322                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1323                 acpi_thermal_check(tz);
1324                 acpi_bus_generate_proc_event(device, event, 0);
1325                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1326                                                   dev_name(&device->dev), event, 0);
1327                 break;
1328         default:
1329                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1330                                   "Unsupported event [0x%x]\n", event));
1331                 break;
1332         }
1333 }
1334
1335 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1336 {
1337         int result = 0;
1338
1339
1340         if (!tz)
1341                 return -EINVAL;
1342
1343         /* Get temperature [_TMP] (required) */
1344         result = acpi_thermal_get_temperature(tz);
1345         if (result)
1346                 return result;
1347
1348         /* Get trip points [_CRT, _PSV, etc.] (required) */
1349         result = acpi_thermal_get_trip_points(tz);
1350         if (result)
1351                 return result;
1352
1353         /* Set the cooling mode [_SCP] to active cooling (default) */
1354         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1355         if (!result)
1356                 tz->flags.cooling_mode = 1;
1357
1358         /* Get default polling frequency [_TZP] (optional) */
1359         if (tzp)
1360                 tz->polling_frequency = tzp;
1361         else
1362                 acpi_thermal_get_polling_frequency(tz);
1363
1364         return 0;
1365 }
1366
1367 /*
1368  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1369  * handles temperature values with a single decimal place. As a consequence,
1370  * some implementations use an offset of 273.1 and others use an offset of
1371  * 273.2. Try to find out which one is being used, to present the most
1372  * accurate and visually appealing number.
1373  *
1374  * The heuristic below should work for all ACPI thermal zones which have a
1375  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1376  */
1377 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1378 {
1379         if (tz->trips.critical.flags.valid &&
1380             (tz->trips.critical.temperature % 5) == 1)
1381                 tz->kelvin_offset = 2731;
1382         else
1383                 tz->kelvin_offset = 2732;
1384 }
1385
1386 static int acpi_thermal_add(struct acpi_device *device)
1387 {
1388         int result = 0;
1389         struct acpi_thermal *tz = NULL;
1390
1391
1392         if (!device)
1393                 return -EINVAL;
1394
1395         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1396         if (!tz)
1397                 return -ENOMEM;
1398
1399         tz->device = device;
1400         strcpy(tz->name, device->pnp.bus_id);
1401         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1402         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1403         device->driver_data = tz;
1404         mutex_init(&tz->lock);
1405
1406
1407         result = acpi_thermal_get_info(tz);
1408         if (result)
1409                 goto free_memory;
1410
1411         acpi_thermal_guess_offset(tz);
1412
1413         result = acpi_thermal_register_thermal_zone(tz);
1414         if (result)
1415                 goto free_memory;
1416
1417         result = acpi_thermal_add_fs(device);
1418         if (result)
1419                 goto unregister_thermal_zone;
1420
1421         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1422                acpi_device_name(device), acpi_device_bid(device),
1423                KELVIN_TO_CELSIUS(tz->temperature));
1424         goto end;
1425
1426 unregister_thermal_zone:
1427         thermal_zone_device_unregister(tz->thermal_zone);
1428 free_memory:
1429         kfree(tz);
1430 end:
1431         return result;
1432 }
1433
1434 static int acpi_thermal_remove(struct acpi_device *device, int type)
1435 {
1436         struct acpi_thermal *tz = NULL;
1437
1438         if (!device || !acpi_driver_data(device))
1439                 return -EINVAL;
1440
1441         tz = acpi_driver_data(device);
1442
1443         acpi_thermal_remove_fs(device);
1444         acpi_thermal_unregister_thermal_zone(tz);
1445         mutex_destroy(&tz->lock);
1446         kfree(tz);
1447         return 0;
1448 }
1449
1450 static int acpi_thermal_resume(struct acpi_device *device)
1451 {
1452         struct acpi_thermal *tz = NULL;
1453         int i, j, power_state, result;
1454
1455
1456         if (!device || !acpi_driver_data(device))
1457                 return -EINVAL;
1458
1459         tz = acpi_driver_data(device);
1460
1461         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1462                 if (!(&tz->trips.active[i]))
1463                         break;
1464                 if (!tz->trips.active[i].flags.valid)
1465                         break;
1466                 tz->trips.active[i].flags.enabled = 1;
1467                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1468                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1469                             handles[j], &power_state);
1470                         if (result || (power_state != ACPI_STATE_D0)) {
1471                                 tz->trips.active[i].flags.enabled = 0;
1472                                 break;
1473                         }
1474                 }
1475                 tz->state.active |= tz->trips.active[i].flags.enabled;
1476         }
1477
1478         acpi_thermal_check(tz);
1479
1480         return AE_OK;
1481 }
1482
1483 static int thermal_act(const struct dmi_system_id *d) {
1484
1485         if (act == 0) {
1486                 printk(KERN_NOTICE "ACPI: %s detected: "
1487                         "disabling all active thermal trip points\n", d->ident);
1488                 act = -1;
1489         }
1490         return 0;
1491 }
1492 static int thermal_nocrt(const struct dmi_system_id *d) {
1493
1494         printk(KERN_NOTICE "ACPI: %s detected: "
1495                 "disabling all critical thermal trip point actions.\n", d->ident);
1496         nocrt = 1;
1497         return 0;
1498 }
1499 static int thermal_tzp(const struct dmi_system_id *d) {
1500
1501         if (tzp == 0) {
1502                 printk(KERN_NOTICE "ACPI: %s detected: "
1503                         "enabling thermal zone polling\n", d->ident);
1504                 tzp = 300;      /* 300 dS = 30 Seconds */
1505         }
1506         return 0;
1507 }
1508 static int thermal_psv(const struct dmi_system_id *d) {
1509
1510         if (psv == 0) {
1511                 printk(KERN_NOTICE "ACPI: %s detected: "
1512                         "disabling all passive thermal trip points\n", d->ident);
1513                 psv = -1;
1514         }
1515         return 0;
1516 }
1517
1518 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1519         /*
1520          * Award BIOS on this AOpen makes thermal control almost worthless.
1521          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1522          */
1523         {
1524          .callback = thermal_act,
1525          .ident = "AOpen i915GMm-HFS",
1526          .matches = {
1527                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1528                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1529                 },
1530         },
1531         {
1532          .callback = thermal_psv,
1533          .ident = "AOpen i915GMm-HFS",
1534          .matches = {
1535                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1536                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1537                 },
1538         },
1539         {
1540          .callback = thermal_tzp,
1541          .ident = "AOpen i915GMm-HFS",
1542          .matches = {
1543                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1544                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1545                 },
1546         },
1547         {
1548          .callback = thermal_nocrt,
1549          .ident = "Gigabyte GA-7ZX",
1550          .matches = {
1551                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1552                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1553                 },
1554         },
1555         {}
1556 };
1557
1558 static int __init acpi_thermal_init(void)
1559 {
1560         int result = 0;
1561
1562         dmi_check_system(thermal_dmi_table);
1563
1564         if (off) {
1565                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1566                 return -ENODEV;
1567         }
1568         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1569         if (!acpi_thermal_dir)
1570                 return -ENODEV;
1571
1572         result = acpi_bus_register_driver(&acpi_thermal_driver);
1573         if (result < 0) {
1574                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1575                 return -ENODEV;
1576         }
1577
1578         return 0;
1579 }
1580
1581 static void __exit acpi_thermal_exit(void)
1582 {
1583
1584         acpi_bus_unregister_driver(&acpi_thermal_driver);
1585
1586         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1587
1588         return;
1589 }
1590
1591 module_init(acpi_thermal_init);
1592 module_exit(acpi_thermal_exit);