SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/dmi.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <linux/device.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/thermal.h>
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  68 ACPI_MODULE_NAME("thermal");
  69
  70 MODULE_AUTHOR("Paul Diefenbaugh");
  71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int act;
  75 module_param(act, int, 0644);
  76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  77
  78 static int crt;
  79 module_param(crt, int, 0644);
  80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  81
  82 static int tzp;
  83 module_param(tzp, int, 0444);
  84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  85
  86 static int nocrt;
  87 module_param(nocrt, int, 0);
  88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  89
  90 static int off;
  91 module_param(off, int, 0);
  92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  93
  94 static int psv;
  95 module_param(psv, int, 0644);
  96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  97
  98 static int acpi_thermal_add(struct acpi_device *device);
  99 static int acpi_thermal_remove(struct acpi_device *device, int type);
 100 static int acpi_thermal_resume(struct acpi_device *device);
 101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 106                                                const char __user *, size_t,
 107                                                loff_t *);
 108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 110                                           size_t, loff_t *);
 111
 112 static const struct acpi_device_id  thermal_device_ids[] = {
 113         {ACPI_THERMAL_HID, 0},
 114         {"", 0},
 115 };
 116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 117
 118 static struct acpi_driver acpi_thermal_driver = {
 119         .name = "thermal",
 120         .class = ACPI_THERMAL_CLASS,
 121         .ids = thermal_device_ids,
 122         .ops = {
 123                 .add = acpi_thermal_add,
 124                 .remove = acpi_thermal_remove,
 125                 .resume = acpi_thermal_resume,
 126                 },
 127 };
 128
 129 struct acpi_thermal_state {
 130         u8 critical:1;
 131         u8 hot:1;
 132         u8 passive:1;
 133         u8 active:1;
 134         u8 reserved:4;
 135         int active_index;
 136 };
 137
 138 struct acpi_thermal_state_flags {
 139         u8 valid:1;
 140         u8 enabled:1;
 141         u8 reserved:6;
 142 };
 143
 144 struct acpi_thermal_critical {
 145         struct acpi_thermal_state_flags flags;
 146         unsigned long temperature;
 147 };
 148
 149 struct acpi_thermal_hot {
 150         struct acpi_thermal_state_flags flags;
 151         unsigned long temperature;
 152 };
 153
 154 struct acpi_thermal_passive {
 155         struct acpi_thermal_state_flags flags;
 156         unsigned long temperature;
 157         unsigned long tc1;
 158         unsigned long tc2;
 159         unsigned long tsp;
 160         struct acpi_handle_list devices;
 161 };
 162
 163 struct acpi_thermal_active {
 164         struct acpi_thermal_state_flags flags;
 165         unsigned long temperature;
 166         struct acpi_handle_list devices;
 167 };
 168
 169 struct acpi_thermal_trips {
 170         struct acpi_thermal_critical critical;
 171         struct acpi_thermal_hot hot;
 172         struct acpi_thermal_passive passive;
 173         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 174 };
 175
 176 struct acpi_thermal_flags {
 177         u8 cooling_mode:1;      /* _SCP */
 178         u8 devices:1;           /* _TZD */
 179         u8 reserved:6;
 180 };
 181
 182 struct acpi_thermal {
 183         struct acpi_device * device;
 184         acpi_bus_id name;
 185         unsigned long temperature;
 186         unsigned long last_temperature;
 187         unsigned long polling_frequency;
 188         volatile u8 zombie;
 189         struct acpi_thermal_flags flags;
 190         struct acpi_thermal_state state;
 191         struct acpi_thermal_trips trips;
 192         struct acpi_handle_list devices;
 193         struct thermal_zone_device *thermal_zone;
 194         int tz_enabled;
 195         int kelvin_offset;
 196         struct mutex lock;
 197 };
 198
 199 static const struct file_operations acpi_thermal_state_fops = {
 200         .owner = THIS_MODULE,
 201         .open = acpi_thermal_state_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static const struct file_operations acpi_thermal_temp_fops = {
 208         .owner = THIS_MODULE,
 209         .open = acpi_thermal_temp_open_fs,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 static const struct file_operations acpi_thermal_trip_fops = {
 216         .owner = THIS_MODULE,
 217         .open = acpi_thermal_trip_open_fs,
 218         .read = seq_read,
 219         .llseek = seq_lseek,
 220         .release = single_release,
 221 };
 222
 223 static const struct file_operations acpi_thermal_cooling_fops = {
 224         .owner = THIS_MODULE,
 225         .open = acpi_thermal_cooling_open_fs,
 226         .read = seq_read,
 227         .write = acpi_thermal_write_cooling_mode,
 228         .llseek = seq_lseek,
 229         .release = single_release,
 230 };
 231
 232 static const struct file_operations acpi_thermal_polling_fops = {
 233         .owner = THIS_MODULE,
 234         .open = acpi_thermal_polling_open_fs,
 235         .read = seq_read,
 236         .write = acpi_thermal_write_polling,
 237         .llseek = seq_lseek,
 238         .release = single_release,
 239 };
 240
 241 /* --------------------------------------------------------------------------
 242                              Thermal Zone Management
 243    -------------------------------------------------------------------------- */
 244
 245 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 246 {
 247         acpi_status status = AE_OK;
 248         unsigned long long tmp;
 249
 250         if (!tz)
 251                 return -EINVAL;
 252
 253         tz->last_temperature = tz->temperature;
 254
 255         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 256         if (ACPI_FAILURE(status))
 257                 return -ENODEV;
 258
 259         tz->temperature = tmp;
 260         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 261                           tz->temperature));
 262
 263         return 0;
 264 }
 265
 266 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 267 {
 268         acpi_status status = AE_OK;
 269         unsigned long long tmp;
 270
 271         if (!tz)
 272                 return -EINVAL;
 273
 274         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 275         if (ACPI_FAILURE(status))
 276                 return -ENODEV;
 277
 278         tz->polling_frequency = tmp;
 279         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 280                           tz->polling_frequency));
 281
 282         return 0;
 283 }
 284
 285 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 286 {
 287
 288         if (!tz)
 289                 return -EINVAL;
 290
 291         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 292
 293         tz->thermal_zone->polling_delay = seconds * 1000;
 294
 295         if (tz->tz_enabled)
 296                 thermal_zone_device_update(tz->thermal_zone);
 297
 298         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 299                           "Polling frequency set to %lu seconds\n",
 300                           tz->polling_frequency/10));
 301
 302         return 0;
 303 }
 304
 305 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 306 {
 307         acpi_status status = AE_OK;
 308         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 309         struct acpi_object_list arg_list = { 1, &arg0 };
 310         acpi_handle handle = NULL;
 311
 312
 313         if (!tz)
 314                 return -EINVAL;
 315
 316         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 317         if (ACPI_FAILURE(status)) {
 318                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 319                 return -ENODEV;
 320         }
 321
 322         arg0.integer.value = mode;
 323
 324         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 325         if (ACPI_FAILURE(status))
 326                 return -ENODEV;
 327
 328         return 0;
 329 }
 330
 331 #define ACPI_TRIPS_CRITICAL     0x01
 332 #define ACPI_TRIPS_HOT          0x02
 333 #define ACPI_TRIPS_PASSIVE      0x04
 334 #define ACPI_TRIPS_ACTIVE       0x08
 335 #define ACPI_TRIPS_DEVICES      0x10
 336
 337 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 338 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 339
 340 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 341                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 342                               ACPI_TRIPS_DEVICES)
 343
 344 /*
 345  * This exception is thrown out in two cases:
 346  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 347  *   when re-evaluating the AML code.
 348  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 349  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 350  */
 351 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 352 do {    \
 353         if (flags != ACPI_TRIPS_INIT)   \
 354                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 355                 "ACPI thermal trip point %s changed\n"  \
 356                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 357 } while (0)
 358
 359 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 360 {
 361         acpi_status status = AE_OK;
 362         unsigned long long tmp;
 363         struct acpi_handle_list devices;
 364         int valid = 0;
 365         int i;
 366
 367         /* Critical Shutdown (required) */
 368         if (flag & ACPI_TRIPS_CRITICAL) {
 369                 status = acpi_evaluate_integer(tz->device->handle,
 370                                 "_CRT", NULL, &tmp);
 371                 tz->trips.critical.temperature = tmp;
 372                 /*
 373                  * Treat freezing temperatures as invalid as well; some
 374                  * BIOSes return really low values and cause reboots at startup.
 375                  * Below zero (Celsius) values clearly aren't right for sure..
 376                  * ... so lets discard those as invalid.
 377                  */
 378                 if (ACPI_FAILURE(status) ||
 379                                 tz->trips.critical.temperature <= 2732) {
 380                         tz->trips.critical.flags.valid = 0;
 381                         ACPI_EXCEPTION((AE_INFO, status,
 382                                         "No or invalid critical threshold"));
 383                         return -ENODEV;
 384                 } else {
 385                         tz->trips.critical.flags.valid = 1;
 386                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 387                                         "Found critical threshold [%lu]\n",
 388                                         tz->trips.critical.temperature));
 389                 }
 390                 if (tz->trips.critical.flags.valid == 1) {
 391                         if (crt == -1) {
 392                                 tz->trips.critical.flags.valid = 0;
 393                         } else if (crt > 0) {
 394                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 395                                 /*
 396                                  * Allow override critical threshold
 397                                  */
 398                                 if (crt_k > tz->trips.critical.temperature)
 399                                         printk(KERN_WARNING PREFIX
 400                                                 "Critical threshold %d C\n", crt);
 401                                 tz->trips.critical.temperature = crt_k;
 402                         }
 403                 }
 404         }
 405
 406         /* Critical Sleep (optional) */
 407         if (flag & ACPI_TRIPS_HOT) {
 408                 status = acpi_evaluate_integer(tz->device->handle,
 409                                 "_HOT", NULL, &tmp);
 410                 if (ACPI_FAILURE(status)) {
 411                         tz->trips.hot.flags.valid = 0;
 412                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 413                                         "No hot threshold\n"));
 414                 } else {
 415                         tz->trips.hot.temperature = tmp;
 416                         tz->trips.hot.flags.valid = 1;
 417                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 418                                         "Found hot threshold [%lu]\n",
 419                                         tz->trips.critical.temperature));
 420                 }
 421         }
 422
 423         /* Passive (optional) */
 424         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 425                 (flag == ACPI_TRIPS_INIT)) {
 426                 valid = tz->trips.passive.flags.valid;
 427                 if (psv == -1) {
 428                         status = AE_SUPPORT;
 429                 } else if (psv > 0) {
 430                         tmp = CELSIUS_TO_KELVIN(psv);
 431                         status = AE_OK;
 432                 } else {
 433                         status = acpi_evaluate_integer(tz->device->handle,
 434                                 "_PSV", NULL, &tmp);
 435                 }
 436
 437                 if (ACPI_FAILURE(status))
 438                         tz->trips.passive.flags.valid = 0;
 439                 else {
 440                         tz->trips.passive.temperature = tmp;
 441                         tz->trips.passive.flags.valid = 1;
 442                         if (flag == ACPI_TRIPS_INIT) {
 443                                 status = acpi_evaluate_integer(
 444                                                 tz->device->handle, "_TC1",
 445                                                 NULL, &tmp);
 446                                 if (ACPI_FAILURE(status))
 447                                         tz->trips.passive.flags.valid = 0;
 448                                 else
 449                                         tz->trips.passive.tc1 = tmp;
 450                                 status = acpi_evaluate_integer(
 451                                                 tz->device->handle, "_TC2",
 452                                                 NULL, &tmp);
 453                                 if (ACPI_FAILURE(status))
 454                                         tz->trips.passive.flags.valid = 0;
 455                                 else
 456                                         tz->trips.passive.tc2 = tmp;
 457                                 status = acpi_evaluate_integer(
 458                                                 tz->device->handle, "_TSP",
 459                                                 NULL, &tmp);
 460                                 if (ACPI_FAILURE(status))
 461                                         tz->trips.passive.flags.valid = 0;
 462                                 else
 463                                         tz->trips.passive.tsp = tmp;
 464                         }
 465                 }
 466         }
 467         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 468                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 469                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 470                                                         NULL, &devices);
 471                 if (ACPI_FAILURE(status)) {
 472                         printk(KERN_WARNING PREFIX
 473                                 "Invalid passive threshold\n");
 474                         tz->trips.passive.flags.valid = 0;
 475                 }
 476                 else
 477                         tz->trips.passive.flags.valid = 1;
 478
 479                 if (memcmp(&tz->trips.passive.devices, &devices,
 480                                 sizeof(struct acpi_handle_list))) {
 481                         memcpy(&tz->trips.passive.devices, &devices,
 482                                 sizeof(struct acpi_handle_list));
 483                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 484                 }
 485         }
 486         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 487                 if (valid != tz->trips.passive.flags.valid)
 488                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 489         }
 490
 491         /* Active (optional) */
 492         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 493                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 494                 valid = tz->trips.active[i].flags.valid;
 495
 496                 if (act == -1)
 497                         break; /* disable all active trip points */
 498
 499                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 500                         tz->trips.active[i].flags.valid)) {
 501                         status = acpi_evaluate_integer(tz->device->handle,
 502                                                         name, NULL, &tmp);
 503                         if (ACPI_FAILURE(status)) {
 504                                 tz->trips.active[i].flags.valid = 0;
 505                                 if (i == 0)
 506                                         break;
 507                                 if (act <= 0)
 508                                         break;
 509                                 if (i == 1)
 510                                         tz->trips.active[0].temperature =
 511                                                 CELSIUS_TO_KELVIN(act);
 512                                 else
 513                                         /*
 514                                          * Don't allow override higher than
 515                                          * the next higher trip point
 516                                          */
 517                                         tz->trips.active[i - 1].temperature =
 518                                                 (tz->trips.active[i - 2].temperature <
 519                                                 CELSIUS_TO_KELVIN(act) ?
 520                                                 tz->trips.active[i - 2].temperature :
 521                                                 CELSIUS_TO_KELVIN(act));
 522                                 break;
 523                         } else {
 524                                 tz->trips.active[i].temperature = tmp;
 525                                 tz->trips.active[i].flags.valid = 1;
 526                         }
 527                 }
 528
 529                 name[2] = 'L';
 530                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 531                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 532                         status = acpi_evaluate_reference(tz->device->handle,
 533                                                 name, NULL, &devices);
 534                         if (ACPI_FAILURE(status)) {
 535                                 printk(KERN_WARNING PREFIX
 536                                         "Invalid active%d threshold\n", i);
 537                                 tz->trips.active[i].flags.valid = 0;
 538                         }
 539                         else
 540                                 tz->trips.active[i].flags.valid = 1;
 541
 542                         if (memcmp(&tz->trips.active[i].devices, &devices,
 543                                         sizeof(struct acpi_handle_list))) {
 544                                 memcpy(&tz->trips.active[i].devices, &devices,
 545                                         sizeof(struct acpi_handle_list));
 546                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 547                         }
 548                 }
 549                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 550                         if (valid != tz->trips.active[i].flags.valid)
 551                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 552
 553                 if (!tz->trips.active[i].flags.valid)
 554                         break;
 555         }
 556
 557         if (flag & ACPI_TRIPS_DEVICES) {
 558                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 559                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 560                                                 NULL, &devices);
 561                 if (memcmp(&tz->devices, &devices,
 562                                 sizeof(struct acpi_handle_list))) {
 563                         memcpy(&tz->devices, &devices,
 564                                 sizeof(struct acpi_handle_list));
 565                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 566                 }
 567         }
 568
 569         return 0;
 570 }
 571
 572 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 573 {
 574         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 575 }
 576
 577 static void acpi_thermal_check(void *data)
 578 {
 579         struct acpi_thermal *tz = data;
 580
 581         thermal_zone_device_update(tz->thermal_zone);
 582 }
 583
 584 /* sys I/F for generic thermal sysfs support */
 585 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 586
 587 static int thermal_get_temp(struct thermal_zone_device *thermal,
 588                             unsigned long *temp)
 589 {
 590         struct acpi_thermal *tz = thermal->devdata;
 591         int result;
 592
 593         if (!tz)
 594                 return -EINVAL;
 595
 596         result = acpi_thermal_get_temperature(tz);
 597         if (result)
 598                 return result;
 599
 600         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 601         return 0;
 602 }
 603
 604 static const char enabled[] = "kernel";
 605 static const char disabled[] = "user";
 606 static int thermal_get_mode(struct thermal_zone_device *thermal,
 607                                 enum thermal_device_mode *mode)
 608 {
 609         struct acpi_thermal *tz = thermal->devdata;
 610
 611         if (!tz)
 612                 return -EINVAL;
 613
 614         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 615                 THERMAL_DEVICE_DISABLED;
 616
 617         return 0;
 618 }
 619
 620 static int thermal_set_mode(struct thermal_zone_device *thermal,
 621                                 enum thermal_device_mode mode)
 622 {
 623         struct acpi_thermal *tz = thermal->devdata;
 624         int enable;
 625
 626         if (!tz)
 627                 return -EINVAL;
 628
 629         /*
 630          * enable/disable thermal management from ACPI thermal driver
 631          */
 632         if (mode == THERMAL_DEVICE_ENABLED)
 633                 enable = 1;
 634         else if (mode == THERMAL_DEVICE_DISABLED)
 635                 enable = 0;
 636         else
 637                 return -EINVAL;
 638
 639         if (enable != tz->tz_enabled) {
 640                 tz->tz_enabled = enable;
 641                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 642                         "%s ACPI thermal control\n",
 643                         tz->tz_enabled ? enabled : disabled));
 644                 acpi_thermal_check(tz);
 645         }
 646         return 0;
 647 }
 648
 649 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 650                                  int trip, enum thermal_trip_type *type)
 651 {
 652         struct acpi_thermal *tz = thermal->devdata;
 653         int i;
 654
 655         if (!tz || trip < 0)
 656                 return -EINVAL;
 657
 658         if (tz->trips.critical.flags.valid) {
 659                 if (!trip) {
 660                         *type = THERMAL_TRIP_CRITICAL;
 661                         return 0;
 662                 }
 663                 trip--;
 664         }
 665
 666         if (tz->trips.hot.flags.valid) {
 667                 if (!trip) {
 668                         *type = THERMAL_TRIP_HOT;
 669                         return 0;
 670                 }
 671                 trip--;
 672         }
 673
 674         if (tz->trips.passive.flags.valid) {
 675                 if (!trip) {
 676                         *type = THERMAL_TRIP_PASSIVE;
 677                         return 0;
 678                 }
 679                 trip--;
 680         }
 681
 682         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 683                 tz->trips.active[i].flags.valid; i++) {
 684                 if (!trip) {
 685                         *type = THERMAL_TRIP_ACTIVE;
 686                         return 0;
 687                 }
 688                 trip--;
 689         }
 690
 691         return -EINVAL;
 692 }
 693
 694 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 695                                  int trip, unsigned long *temp)
 696 {
 697         struct acpi_thermal *tz = thermal->devdata;
 698         int i;
 699
 700         if (!tz || trip < 0)
 701                 return -EINVAL;
 702
 703         if (tz->trips.critical.flags.valid) {
 704                 if (!trip) {
 705                         *temp = KELVIN_TO_MILLICELSIUS(
 706                                 tz->trips.critical.temperature,
 707                                 tz->kelvin_offset);
 708                         return 0;
 709                 }
 710                 trip--;
 711         }
 712
 713         if (tz->trips.hot.flags.valid) {
 714                 if (!trip) {
 715                         *temp = KELVIN_TO_MILLICELSIUS(
 716                                 tz->trips.hot.temperature,
 717                                 tz->kelvin_offset);
 718                         return 0;
 719                 }
 720                 trip--;
 721         }
 722
 723         if (tz->trips.passive.flags.valid) {
 724                 if (!trip) {
 725                         *temp = KELVIN_TO_MILLICELSIUS(
 726                                 tz->trips.passive.temperature,
 727                                 tz->kelvin_offset);
 728                         return 0;
 729                 }
 730                 trip--;
 731         }
 732
 733         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 734                 tz->trips.active[i].flags.valid; i++) {
 735                 if (!trip) {
 736                         *temp = KELVIN_TO_MILLICELSIUS(
 737                                 tz->trips.active[i].temperature,
 738                                 tz->kelvin_offset);
 739                         return 0;
 740                 }
 741                 trip--;
 742         }
 743
 744         return -EINVAL;
 745 }
 746
 747 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 748                                 unsigned long *temperature) {
 749         struct acpi_thermal *tz = thermal->devdata;
 750
 751         if (tz->trips.critical.flags.valid) {
 752                 *temperature = KELVIN_TO_MILLICELSIUS(
 753                                 tz->trips.critical.temperature,
 754                                 tz->kelvin_offset);
 755                 return 0;
 756         } else
 757                 return -EINVAL;
 758 }
 759
 760 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 761                            enum thermal_trip_type trip_type)
 762 {
 763         u8 type = 0;
 764         struct acpi_thermal *tz = thermal->devdata;
 765
 766         if (trip_type == THERMAL_TRIP_CRITICAL)
 767                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 768         else if (trip_type == THERMAL_TRIP_HOT)
 769                 type = ACPI_THERMAL_NOTIFY_HOT;
 770         else
 771                 return 0;
 772
 773         acpi_bus_generate_proc_event(tz->device, type, 1);
 774         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 775                                         dev_name(&tz->device->dev), type, 1);
 776
 777         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 778                 return 1;
 779
 780         return 0;
 781 }
 782
 783 typedef int (*cb)(struct thermal_zone_device *, int,
 784                   struct thermal_cooling_device *);
 785 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 786                                         struct thermal_cooling_device *cdev,
 787                                         cb action)
 788 {
 789         struct acpi_device *device = cdev->devdata;
 790         struct acpi_thermal *tz = thermal->devdata;
 791         struct acpi_device *dev;
 792         acpi_status status;
 793         acpi_handle handle;
 794         int i;
 795         int j;
 796         int trip = -1;
 797         int result = 0;
 798
 799         if (tz->trips.critical.flags.valid)
 800                 trip++;
 801
 802         if (tz->trips.hot.flags.valid)
 803                 trip++;
 804
 805         if (tz->trips.passive.flags.valid) {
 806                 trip++;
 807                 for (i = 0; i < tz->trips.passive.devices.count;
 808                     i++) {
 809                         handle = tz->trips.passive.devices.handles[i];
 810                         status = acpi_bus_get_device(handle, &dev);
 811                         if (ACPI_SUCCESS(status) && (dev == device)) {
 812                                 result = action(thermal, trip, cdev);
 813                                 if (result)
 814                                         goto failed;
 815                         }
 816                 }
 817         }
 818
 819         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 820                 if (!tz->trips.active[i].flags.valid)
 821                         break;
 822                 trip++;
 823                 for (j = 0;
 824                     j < tz->trips.active[i].devices.count;
 825                     j++) {
 826                         handle = tz->trips.active[i].devices.handles[j];
 827                         status = acpi_bus_get_device(handle, &dev);
 828                         if (ACPI_SUCCESS(status) && (dev == device)) {
 829                                 result = action(thermal, trip, cdev);
 830                                 if (result)
 831                                         goto failed;
 832                         }
 833                 }
 834         }
 835
 836         for (i = 0; i < tz->devices.count; i++) {
 837                 handle = tz->devices.handles[i];
 838                 status = acpi_bus_get_device(handle, &dev);
 839                 if (ACPI_SUCCESS(status) && (dev == device)) {
 840                         result = action(thermal, -1, cdev);
 841                         if (result)
 842                                 goto failed;
 843                 }
 844         }
 845
 846 failed:
 847         return result;
 848 }
 849
 850 static int
 851 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 852                                         struct thermal_cooling_device *cdev)
 853 {
 854         return acpi_thermal_cooling_device_cb(thermal, cdev,
 855                                 thermal_zone_bind_cooling_device);
 856 }
 857
 858 static int
 859 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 860                                         struct thermal_cooling_device *cdev)
 861 {
 862         return acpi_thermal_cooling_device_cb(thermal, cdev,
 863                                 thermal_zone_unbind_cooling_device);
 864 }
 865
 866 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 867         .bind = acpi_thermal_bind_cooling_device,
 868         .unbind = acpi_thermal_unbind_cooling_device,
 869         .get_temp = thermal_get_temp,
 870         .get_mode = thermal_get_mode,
 871         .set_mode = thermal_set_mode,
 872         .get_trip_type = thermal_get_trip_type,
 873         .get_trip_temp = thermal_get_trip_temp,
 874         .get_crit_temp = thermal_get_crit_temp,
 875         .notify = thermal_notify,
 876 };
 877
 878 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 879 {
 880         int trips = 0;
 881         int result;
 882         acpi_status status;
 883         int i;
 884
 885         if (tz->trips.critical.flags.valid)
 886                 trips++;
 887
 888         if (tz->trips.hot.flags.valid)
 889                 trips++;
 890
 891         if (tz->trips.passive.flags.valid)
 892                 trips++;
 893
 894         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 895                         tz->trips.active[i].flags.valid; i++, trips++);
 896
 897         if (tz->trips.passive.flags.valid)
 898                 tz->thermal_zone =
 899                         thermal_zone_device_register("acpitz", trips, tz,
 900                                                      &acpi_thermal_zone_ops,
 901                                                      tz->trips.passive.tc1,
 902                                                      tz->trips.passive.tc2,
 903                                                      tz->trips.passive.tsp*100,
 904                                                      tz->polling_frequency*100);
 905         else
 906                 tz->thermal_zone =
 907                         thermal_zone_device_register("acpitz", trips, tz,
 908                                                      &acpi_thermal_zone_ops,
 909                                                      0, 0, 0,
 910                                                      tz->polling_frequency);
 911         if (IS_ERR(tz->thermal_zone))
 912                 return -ENODEV;
 913
 914         result = sysfs_create_link(&tz->device->dev.kobj,
 915                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 916         if (result)
 917                 return result;
 918
 919         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 920                                    &tz->device->dev.kobj, "device");
 921         if (result)
 922                 return result;
 923
 924         status = acpi_attach_data(tz->device->handle,
 925                                   acpi_bus_private_data_handler,
 926                                   tz->thermal_zone);
 927         if (ACPI_FAILURE(status)) {
 928                 printk(KERN_ERR PREFIX
 929                                 "Error attaching device data\n");
 930                 return -ENODEV;
 931         }
 932
 933         tz->tz_enabled = 1;
 934
 935         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 936                  tz->thermal_zone->id);
 937         return 0;
 938 }
 939
 940 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 941 {
 942         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 943         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 944         thermal_zone_device_unregister(tz->thermal_zone);
 945         tz->thermal_zone = NULL;
 946         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 947 }
 948
 949
 950 /* --------------------------------------------------------------------------
 951                               FS Interface (/proc)
 952    -------------------------------------------------------------------------- */
 953
 954 static struct proc_dir_entry *acpi_thermal_dir;
 955
 956 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 957 {
 958         struct acpi_thermal *tz = seq->private;
 959
 960
 961         if (!tz)
 962                 goto end;
 963
 964         seq_puts(seq, "state:                   ");
 965
 966         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 967             && !tz->state.active)
 968                 seq_puts(seq, "ok\n");
 969         else {
 970                 if (tz->state.critical)
 971                         seq_puts(seq, "critical ");
 972                 if (tz->state.hot)
 973                         seq_puts(seq, "hot ");
 974                 if (tz->state.passive)
 975                         seq_puts(seq, "passive ");
 976                 if (tz->state.active)
 977                         seq_printf(seq, "active[%d]", tz->state.active_index);
 978                 seq_puts(seq, "\n");
 979         }
 980
 981       end:
 982         return 0;
 983 }
 984
 985 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 986 {
 987         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 988 }
 989
 990 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 991 {
 992         int result = 0;
 993         struct acpi_thermal *tz = seq->private;
 994
 995
 996         if (!tz)
 997                 goto end;
 998
 999         result = acpi_thermal_get_temperature(tz);
1000         if (result)
1001                 goto end;
1002
1003         seq_printf(seq, "temperature:             %ld C\n",
1004                    KELVIN_TO_CELSIUS(tz->temperature));
1005
1006       end:
1007         return 0;
1008 }
1009
1010 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1011 {
1012         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1013 }
1014
1015 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1016 {
1017         struct acpi_thermal *tz = seq->private;
1018         struct acpi_device *device;
1019         acpi_status status;
1020
1021         int i = 0;
1022         int j = 0;
1023
1024
1025         if (!tz)
1026                 goto end;
1027
1028         if (tz->trips.critical.flags.valid)
1029                 seq_printf(seq, "critical (S5):           %ld C%s",
1030                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1031                            nocrt ? " <disabled>\n" : "\n");
1032
1033         if (tz->trips.hot.flags.valid)
1034                 seq_printf(seq, "hot (S4):                %ld C%s",
1035                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1036                            nocrt ? " <disabled>\n" : "\n");
1037
1038         if (tz->trips.passive.flags.valid) {
1039                 seq_printf(seq,
1040                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1041                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1042                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1043                            tz->trips.passive.tsp);
1044                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1045                         status = acpi_bus_get_device(tz->trips.passive.devices.
1046                                                      handles[j], &device);
1047                         seq_printf(seq, "%4.4s ", status ? "" :
1048                                    acpi_device_bid(device));
1049                 }
1050                 seq_puts(seq, "\n");
1051         }
1052
1053         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1054                 if (!(tz->trips.active[i].flags.valid))
1055                         break;
1056                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1057                            i,
1058                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1059                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1060                         status = acpi_bus_get_device(tz->trips.active[i].
1061                                                      devices.handles[j],
1062                                                      &device);
1063                         seq_printf(seq, "%4.4s ", status ? "" :
1064                                    acpi_device_bid(device));
1065                 }
1066                 seq_puts(seq, "\n");
1067         }
1068
1069       end:
1070         return 0;
1071 }
1072
1073 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1074 {
1075         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1076 }
1077
1078 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1079 {
1080         struct acpi_thermal *tz = seq->private;
1081
1082
1083         if (!tz)
1084                 goto end;
1085
1086         if (!tz->flags.cooling_mode)
1087                 seq_puts(seq, "<setting not supported>\n");
1088         else
1089                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1090
1091       end:
1092         return 0;
1093 }
1094
1095 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1096 {
1097         return single_open(file, acpi_thermal_cooling_seq_show,
1098                            PDE(inode)->data);
1099 }
1100
1101 static ssize_t
1102 acpi_thermal_write_cooling_mode(struct file *file,
1103                                 const char __user * buffer,
1104                                 size_t count, loff_t * ppos)
1105 {
1106         struct seq_file *m = file->private_data;
1107         struct acpi_thermal *tz = m->private;
1108         int result = 0;
1109         char mode_string[12] = { '\0' };
1110
1111
1112         if (!tz || (count > sizeof(mode_string) - 1))
1113                 return -EINVAL;
1114
1115         if (!tz->flags.cooling_mode)
1116                 return -ENODEV;
1117
1118         if (copy_from_user(mode_string, buffer, count))
1119                 return -EFAULT;
1120
1121         mode_string[count] = '\0';
1122
1123         result = acpi_thermal_set_cooling_mode(tz,
1124                                                simple_strtoul(mode_string, NULL,
1125                                                               0));
1126         if (result)
1127                 return result;
1128
1129         acpi_thermal_check(tz);
1130
1131         return count;
1132 }
1133
1134 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1135 {
1136         struct acpi_thermal *tz = seq->private;
1137
1138
1139         if (!tz)
1140                 goto end;
1141
1142         if (!tz->thermal_zone->polling_delay) {
1143                 seq_puts(seq, "<polling disabled>\n");
1144                 goto end;
1145         }
1146
1147         seq_printf(seq, "polling frequency:       %d seconds\n",
1148                    (tz->thermal_zone->polling_delay / 1000));
1149
1150       end:
1151         return 0;
1152 }
1153
1154 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1155 {
1156         return single_open(file, acpi_thermal_polling_seq_show,
1157                            PDE(inode)->data);
1158 }
1159
1160 static ssize_t
1161 acpi_thermal_write_polling(struct file *file,
1162                            const char __user * buffer,
1163                            size_t count, loff_t * ppos)
1164 {
1165         struct seq_file *m = file->private_data;
1166         struct acpi_thermal *tz = m->private;
1167         int result = 0;
1168         char polling_string[12] = { '\0' };
1169         int seconds = 0;
1170
1171
1172         if (!tz || (count > sizeof(polling_string) - 1))
1173                 return -EINVAL;
1174
1175         if (copy_from_user(polling_string, buffer, count))
1176                 return -EFAULT;
1177
1178         polling_string[count] = '\0';
1179
1180         seconds = simple_strtoul(polling_string, NULL, 0);
1181
1182         result = acpi_thermal_set_polling(tz, seconds);
1183         if (result)
1184                 return result;
1185
1186         acpi_thermal_check(tz);
1187
1188         return count;
1189 }
1190
1191 static int acpi_thermal_add_fs(struct acpi_device *device)
1192 {
1193         struct proc_dir_entry *entry = NULL;
1194
1195
1196         if (!acpi_device_dir(device)) {
1197                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1198                                                      acpi_thermal_dir);
1199                 if (!acpi_device_dir(device))
1200                         return -ENODEV;
1201         }
1202
1203         /* 'state' [R] */
1204         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1205                                  S_IRUGO, acpi_device_dir(device),
1206                                  &acpi_thermal_state_fops,
1207                                  acpi_driver_data(device));
1208         if (!entry)
1209                 return -ENODEV;
1210
1211         /* 'temperature' [R] */
1212         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1213                                  S_IRUGO, acpi_device_dir(device),
1214                                  &acpi_thermal_temp_fops,
1215                                  acpi_driver_data(device));
1216         if (!entry)
1217                 return -ENODEV;
1218
1219         /* 'trip_points' [R] */
1220         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1221                                  S_IRUGO,
1222                                  acpi_device_dir(device),
1223                                  &acpi_thermal_trip_fops,
1224                                  acpi_driver_data(device));
1225         if (!entry)
1226                 return -ENODEV;
1227
1228         /* 'cooling_mode' [R/W] */
1229         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1230                                  S_IFREG | S_IRUGO | S_IWUSR,
1231                                  acpi_device_dir(device),
1232                                  &acpi_thermal_cooling_fops,
1233                                  acpi_driver_data(device));
1234         if (!entry)
1235                 return -ENODEV;
1236
1237         /* 'polling_frequency' [R/W] */
1238         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1239                                  S_IFREG | S_IRUGO | S_IWUSR,
1240                                  acpi_device_dir(device),
1241                                  &acpi_thermal_polling_fops,
1242                                  acpi_driver_data(device));
1243         if (!entry)
1244                 return -ENODEV;
1245         return 0;
1246 }
1247
1248 static int acpi_thermal_remove_fs(struct acpi_device *device)
1249 {
1250
1251         if (acpi_device_dir(device)) {
1252                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1253                                   acpi_device_dir(device));
1254                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1255                                   acpi_device_dir(device));
1256                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1257                                   acpi_device_dir(device));
1258                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1259                                   acpi_device_dir(device));
1260                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1261                                   acpi_device_dir(device));
1262                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1263                 acpi_device_dir(device) = NULL;
1264         }
1265
1266         return 0;
1267 }
1268
1269 /* --------------------------------------------------------------------------
1270                                  Driver Interface
1271    -------------------------------------------------------------------------- */
1272
1273 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1274 {
1275         struct acpi_thermal *tz = data;
1276         struct acpi_device *device = NULL;
1277
1278
1279         if (!tz)
1280                 return;
1281
1282         device = tz->device;
1283
1284         switch (event) {
1285         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1286                 acpi_thermal_check(tz);
1287                 break;
1288         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1289                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1290                 acpi_thermal_check(tz);
1291                 acpi_bus_generate_proc_event(device, event, 0);
1292                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1293                                                   dev_name(&device->dev), event, 0);
1294                 break;
1295         case ACPI_THERMAL_NOTIFY_DEVICES:
1296                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1297                 acpi_thermal_check(tz);
1298                 acpi_bus_generate_proc_event(device, event, 0);
1299                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1300                                                   dev_name(&device->dev), event, 0);
1301                 break;
1302         default:
1303                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1304                                   "Unsupported event [0x%x]\n", event));
1305                 break;
1306         }
1307
1308         return;
1309 }
1310
1311 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1312 {
1313         int result = 0;
1314
1315
1316         if (!tz)
1317                 return -EINVAL;
1318
1319         /* Get temperature [_TMP] (required) */
1320         result = acpi_thermal_get_temperature(tz);
1321         if (result)
1322                 return result;
1323
1324         /* Get trip points [_CRT, _PSV, etc.] (required) */
1325         result = acpi_thermal_get_trip_points(tz);
1326         if (result)
1327                 return result;
1328
1329         /* Set the cooling mode [_SCP] to active cooling (default) */
1330         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1331         if (!result)
1332                 tz->flags.cooling_mode = 1;
1333
1334         /* Get default polling frequency [_TZP] (optional) */
1335         if (tzp)
1336                 tz->polling_frequency = tzp;
1337         else
1338                 acpi_thermal_get_polling_frequency(tz);
1339
1340         return 0;
1341 }
1342
1343 /*
1344  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1345  * handles temperature values with a single decimal place. As a consequence,
1346  * some implementations use an offset of 273.1 and others use an offset of
1347  * 273.2. Try to find out which one is being used, to present the most
1348  * accurate and visually appealing number.
1349  *
1350  * The heuristic below should work for all ACPI thermal zones which have a
1351  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1352  */
1353 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1354 {
1355         if (tz->trips.critical.flags.valid &&
1356             (tz->trips.critical.temperature % 5) == 1)
1357                 tz->kelvin_offset = 2731;
1358         else
1359                 tz->kelvin_offset = 2732;
1360 }
1361
1362 static int acpi_thermal_add(struct acpi_device *device)
1363 {
1364         int result = 0;
1365         acpi_status status = AE_OK;
1366         struct acpi_thermal *tz = NULL;
1367
1368
1369         if (!device)
1370                 return -EINVAL;
1371
1372         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1373         if (!tz)
1374                 return -ENOMEM;
1375
1376         tz->device = device;
1377         strcpy(tz->name, device->pnp.bus_id);
1378         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1379         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1380         device->driver_data = tz;
1381         mutex_init(&tz->lock);
1382
1383
1384         result = acpi_thermal_get_info(tz);
1385         if (result)
1386                 goto free_memory;
1387
1388         acpi_thermal_guess_offset(tz);
1389
1390         result = acpi_thermal_register_thermal_zone(tz);
1391         if (result)
1392                 goto free_memory;
1393
1394         result = acpi_thermal_add_fs(device);
1395         if (result)
1396                 goto unregister_thermal_zone;
1397
1398         status = acpi_install_notify_handler(device->handle,
1399                                              ACPI_DEVICE_NOTIFY,
1400                                              acpi_thermal_notify, tz);
1401         if (ACPI_FAILURE(status)) {
1402                 result = -ENODEV;
1403                 goto remove_fs;
1404         }
1405
1406         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1407                acpi_device_name(device), acpi_device_bid(device),
1408                KELVIN_TO_CELSIUS(tz->temperature));
1409         goto end;
1410
1411 remove_fs:
1412         acpi_thermal_remove_fs(device);
1413 unregister_thermal_zone:
1414         thermal_zone_device_unregister(tz->thermal_zone);
1415 free_memory:
1416         kfree(tz);
1417 end:
1418         return result;
1419 }
1420
1421 static int acpi_thermal_remove(struct acpi_device *device, int type)
1422 {
1423         acpi_status status = AE_OK;
1424         struct acpi_thermal *tz = NULL;
1425
1426         if (!device || !acpi_driver_data(device))
1427                 return -EINVAL;
1428
1429         tz = acpi_driver_data(device);
1430
1431         status = acpi_remove_notify_handler(device->handle,
1432                                             ACPI_DEVICE_NOTIFY,
1433                                             acpi_thermal_notify);
1434
1435         acpi_thermal_remove_fs(device);
1436         acpi_thermal_unregister_thermal_zone(tz);
1437         mutex_destroy(&tz->lock);
1438         kfree(tz);
1439         return 0;
1440 }
1441
1442 static int acpi_thermal_resume(struct acpi_device *device)
1443 {
1444         struct acpi_thermal *tz = NULL;
1445         int i, j, power_state, result;
1446
1447
1448         if (!device || !acpi_driver_data(device))
1449                 return -EINVAL;
1450
1451         tz = acpi_driver_data(device);
1452
1453         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1454                 if (!(&tz->trips.active[i]))
1455                         break;
1456                 if (!tz->trips.active[i].flags.valid)
1457                         break;
1458                 tz->trips.active[i].flags.enabled = 1;
1459                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1460                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1461                             handles[j], &power_state);
1462                         if (result || (power_state != ACPI_STATE_D0)) {
1463                                 tz->trips.active[i].flags.enabled = 0;
1464                                 break;
1465                         }
1466                 }
1467                 tz->state.active |= tz->trips.active[i].flags.enabled;
1468         }
1469
1470         acpi_thermal_check(tz);
1471
1472         return AE_OK;
1473 }
1474
1475 static int thermal_act(const struct dmi_system_id *d) {
1476
1477         if (act == 0) {
1478                 printk(KERN_NOTICE "ACPI: %s detected: "
1479                         "disabling all active thermal trip points\n", d->ident);
1480                 act = -1;
1481         }
1482         return 0;
1483 }
1484 static int thermal_nocrt(const struct dmi_system_id *d) {
1485
1486         printk(KERN_NOTICE "ACPI: %s detected: "
1487                 "disabling all critical thermal trip point actions.\n", d->ident);
1488         nocrt = 1;
1489         return 0;
1490 }
1491 static int thermal_tzp(const struct dmi_system_id *d) {
1492
1493         if (tzp == 0) {
1494                 printk(KERN_NOTICE "ACPI: %s detected: "
1495                         "enabling thermal zone polling\n", d->ident);
1496                 tzp = 300;      /* 300 dS = 30 Seconds */
1497         }
1498         return 0;
1499 }
1500 static int thermal_psv(const struct dmi_system_id *d) {
1501
1502         if (psv == 0) {
1503                 printk(KERN_NOTICE "ACPI: %s detected: "
1504                         "disabling all passive thermal trip points\n", d->ident);
1505                 psv = -1;
1506         }
1507         return 0;
1508 }
1509
1510 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1511         /*
1512          * Award BIOS on this AOpen makes thermal control almost worthless.
1513          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1514          */
1515         {
1516          .callback = thermal_act,
1517          .ident = "AOpen i915GMm-HFS",
1518          .matches = {
1519                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1520                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1521                 },
1522         },
1523         {
1524          .callback = thermal_psv,
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_tzp,
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_nocrt,
1541          .ident = "Gigabyte GA-7ZX",
1542          .matches = {
1543                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1544                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1545                 },
1546         },
1547         {}
1548 };
1549
1550 static int __init acpi_thermal_init(void)
1551 {
1552         int result = 0;
1553
1554         dmi_check_system(thermal_dmi_table);
1555
1556         if (off) {
1557                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1558                 return -ENODEV;
1559         }
1560         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1561         if (!acpi_thermal_dir)
1562                 return -ENODEV;
1563
1564         result = acpi_bus_register_driver(&acpi_thermal_driver);
1565         if (result < 0) {
1566                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1567                 return -ENODEV;
1568         }
1569
1570         return 0;
1571 }
1572
1573 static void __exit acpi_thermal_exit(void)
1574 {
1575
1576         acpi_bus_unregister_driver(&acpi_thermal_driver);
1577
1578         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1579
1580         return;
1581 }
1582
1583 module_init(acpi_thermal_init);
1584 module_exit(acpi_thermal_exit);