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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/timer.h>
  41 #include <linux/jiffies.h>
  42 #include <linux/kmod.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/reboot.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_COMPONENT          0x04000000
  51 #define ACPI_THERMAL_CLASS              "thermal_zone"
  52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  53 #define ACPI_THERMAL_FILE_STATE         "state"
  54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  64
  65 #define ACPI_THERMAL_MAX_ACTIVE 10
  66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  67
  68 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  69 ACPI_MODULE_NAME("thermal");
  70
  71 MODULE_AUTHOR("Paul Diefenbaugh");
  72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  73 MODULE_LICENSE("GPL");
  74
  75 static int act;
  76 module_param(act, int, 0644);
  77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  78
  79 static int crt;
  80 module_param(crt, int, 0644);
  81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  82
  83 static int tzp;
  84 module_param(tzp, int, 0444);
  85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  86
  87 static int nocrt;
  88 module_param(nocrt, int, 0);
  89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  90
  91 static int off;
  92 module_param(off, int, 0);
  93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  94
  95 static int psv;
  96 module_param(psv, int, 0644);
  97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  98
  99 static int acpi_thermal_add(struct acpi_device *device);
 100 static int acpi_thermal_remove(struct acpi_device *device, int type);
 101 static int acpi_thermal_resume(struct acpi_device *device);
 102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 106 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 107                                                const char __user *, size_t,
 108                                                loff_t *);
 109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 111                                           size_t, loff_t *);
 112
 113 static const struct acpi_device_id  thermal_device_ids[] = {
 114         {ACPI_THERMAL_HID, 0},
 115         {"", 0},
 116 };
 117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 118
 119 static struct acpi_driver acpi_thermal_driver = {
 120         .name = "thermal",
 121         .class = ACPI_THERMAL_CLASS,
 122         .ids = thermal_device_ids,
 123         .ops = {
 124                 .add = acpi_thermal_add,
 125                 .remove = acpi_thermal_remove,
 126                 .resume = acpi_thermal_resume,
 127                 },
 128 };
 129
 130 struct acpi_thermal_state {
 131         u8 critical:1;
 132         u8 hot:1;
 133         u8 passive:1;
 134         u8 active:1;
 135         u8 reserved:4;
 136         int active_index;
 137 };
 138
 139 struct acpi_thermal_state_flags {
 140         u8 valid:1;
 141         u8 enabled:1;
 142         u8 reserved:6;
 143 };
 144
 145 struct acpi_thermal_critical {
 146         struct acpi_thermal_state_flags flags;
 147         unsigned long temperature;
 148 };
 149
 150 struct acpi_thermal_hot {
 151         struct acpi_thermal_state_flags flags;
 152         unsigned long temperature;
 153 };
 154
 155 struct acpi_thermal_passive {
 156         struct acpi_thermal_state_flags flags;
 157         unsigned long temperature;
 158         unsigned long tc1;
 159         unsigned long tc2;
 160         unsigned long tsp;
 161         struct acpi_handle_list devices;
 162 };
 163
 164 struct acpi_thermal_active {
 165         struct acpi_thermal_state_flags flags;
 166         unsigned long temperature;
 167         struct acpi_handle_list devices;
 168 };
 169
 170 struct acpi_thermal_trips {
 171         struct acpi_thermal_critical critical;
 172         struct acpi_thermal_hot hot;
 173         struct acpi_thermal_passive passive;
 174         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 175 };
 176
 177 struct acpi_thermal_flags {
 178         u8 cooling_mode:1;      /* _SCP */
 179         u8 devices:1;           /* _TZD */
 180         u8 reserved:6;
 181 };
 182
 183 struct acpi_thermal {
 184         struct acpi_device * device;
 185         acpi_bus_id name;
 186         unsigned long temperature;
 187         unsigned long last_temperature;
 188         unsigned long polling_frequency;
 189         volatile u8 zombie;
 190         struct acpi_thermal_flags flags;
 191         struct acpi_thermal_state state;
 192         struct acpi_thermal_trips trips;
 193         struct acpi_handle_list devices;
 194         struct timer_list timer;
 195         struct thermal_zone_device *thermal_zone;
 196         int tz_enabled;
 197         struct mutex lock;
 198 };
 199
 200 static const struct file_operations acpi_thermal_state_fops = {
 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         .open = acpi_thermal_temp_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static const struct file_operations acpi_thermal_trip_fops = {
 215         .open = acpi_thermal_trip_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static const struct file_operations acpi_thermal_cooling_fops = {
 222         .open = acpi_thermal_cooling_open_fs,
 223         .read = seq_read,
 224         .write = acpi_thermal_write_cooling_mode,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 static const struct file_operations acpi_thermal_polling_fops = {
 230         .open = acpi_thermal_polling_open_fs,
 231         .read = seq_read,
 232         .write = acpi_thermal_write_polling,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* --------------------------------------------------------------------------
 238                              Thermal Zone Management
 239    -------------------------------------------------------------------------- */
 240
 241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245
 246         if (!tz)
 247                 return -EINVAL;
 248
 249         tz->last_temperature = tz->temperature;
 250
 251         status =
 252             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 253         if (ACPI_FAILURE(status))
 254                 return -ENODEV;
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 257                           tz->temperature));
 258
 259         return 0;
 260 }
 261
 262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 263 {
 264         acpi_status status = AE_OK;
 265
 266
 267         if (!tz)
 268                 return -EINVAL;
 269
 270         status =
 271             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 272                                   &tz->polling_frequency);
 273         if (ACPI_FAILURE(status))
 274                 return -ENODEV;
 275
 276         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 277                           tz->polling_frequency));
 278
 279         return 0;
 280 }
 281
 282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 283 {
 284
 285         if (!tz)
 286                 return -EINVAL;
 287
 288         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 289
 290         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 291                           "Polling frequency set to %lu seconds\n",
 292                           tz->polling_frequency/10));
 293
 294         return 0;
 295 }
 296
 297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 298 {
 299         acpi_status status = AE_OK;
 300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 301         struct acpi_object_list arg_list = { 1, &arg0 };
 302         acpi_handle handle = NULL;
 303
 304
 305         if (!tz)
 306                 return -EINVAL;
 307
 308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 309         if (ACPI_FAILURE(status)) {
 310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 311                 return -ENODEV;
 312         }
 313
 314         arg0.integer.value = mode;
 315
 316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 317         if (ACPI_FAILURE(status))
 318                 return -ENODEV;
 319
 320         return 0;
 321 }
 322
 323 #define ACPI_TRIPS_CRITICAL     0x01
 324 #define ACPI_TRIPS_HOT          0x02
 325 #define ACPI_TRIPS_PASSIVE      0x04
 326 #define ACPI_TRIPS_ACTIVE       0x08
 327 #define ACPI_TRIPS_DEVICES      0x10
 328
 329 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 330 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 331
 332 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 333                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 334                               ACPI_TRIPS_DEVICES)
 335
 336 /*
 337  * This exception is thrown out in two cases:
 338  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 339  *   when re-evaluating the AML code.
 340  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 341  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 342  */
 343 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 344 do {    \
 345         if (flags != ACPI_TRIPS_INIT)   \
 346                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 347                 "ACPI thermal trip point %s changed\n"  \
 348                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 349 } while (0)
 350
 351 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 352 {
 353         acpi_status status = AE_OK;
 354         struct acpi_handle_list devices;
 355         int valid = 0;
 356         int i;
 357
 358         /* Critical Shutdown (required) */
 359         if (flag & ACPI_TRIPS_CRITICAL) {
 360                 status = acpi_evaluate_integer(tz->device->handle,
 361                                 "_CRT", NULL, &tz->trips.critical.temperature);
 362                 if (ACPI_FAILURE(status)) {
 363                         tz->trips.critical.flags.valid = 0;
 364                         ACPI_EXCEPTION((AE_INFO, status,
 365                                         "No critical threshold"));
 366                         return -ENODEV;
 367                 } else {
 368                         tz->trips.critical.flags.valid = 1;
 369                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 370                                         "Found critical threshold [%lu]\n",
 371                                         tz->trips.critical.temperature));
 372                 }
 373                 if (tz->trips.critical.flags.valid == 1) {
 374                         if (crt == -1) {
 375                                 tz->trips.critical.flags.valid = 0;
 376                         } else if (crt > 0) {
 377                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 378                                 /*
 379                                  * Allow override to lower critical threshold
 380                                  */
 381                                 if (crt_k < tz->trips.critical.temperature)
 382                                         tz->trips.critical.temperature = crt_k;
 383                         }
 384                 }
 385         }
 386
 387         /* Critical Sleep (optional) */
 388         if (flag & ACPI_TRIPS_HOT) {
 389                 status = acpi_evaluate_integer(tz->device->handle,
 390                                 "_HOT", NULL, &tz->trips.hot.temperature);
 391                 if (ACPI_FAILURE(status)) {
 392                         tz->trips.hot.flags.valid = 0;
 393                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 394                                         "No hot threshold\n"));
 395                 } else {
 396                         tz->trips.hot.flags.valid = 1;
 397                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 398                                         "Found hot threshold [%lu]\n",
 399                                         tz->trips.critical.temperature));
 400                 }
 401         }
 402
 403         /* Passive (optional) */
 404         if (flag & ACPI_TRIPS_PASSIVE) {
 405                 valid = tz->trips.passive.flags.valid;
 406                 if (psv == -1) {
 407                         status = AE_SUPPORT;
 408                 } else if (psv > 0) {
 409                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 410                         status = AE_OK;
 411                 } else {
 412                         status = acpi_evaluate_integer(tz->device->handle,
 413                                 "_PSV", NULL, &tz->trips.passive.temperature);
 414                 }
 415
 416                 if (ACPI_FAILURE(status))
 417                         tz->trips.passive.flags.valid = 0;
 418                 else {
 419                         tz->trips.passive.flags.valid = 1;
 420                         if (flag == ACPI_TRIPS_INIT) {
 421                                 status = acpi_evaluate_integer(
 422                                                 tz->device->handle, "_TC1",
 423                                                 NULL, &tz->trips.passive.tc1);
 424                                 if (ACPI_FAILURE(status))
 425                                         tz->trips.passive.flags.valid = 0;
 426                                 status = acpi_evaluate_integer(
 427                                                 tz->device->handle, "_TC2",
 428                                                 NULL, &tz->trips.passive.tc2);
 429                                 if (ACPI_FAILURE(status))
 430                                         tz->trips.passive.flags.valid = 0;
 431                                 status = acpi_evaluate_integer(
 432                                                 tz->device->handle, "_TSP",
 433                                                 NULL, &tz->trips.passive.tsp);
 434                                 if (ACPI_FAILURE(status))
 435                                         tz->trips.passive.flags.valid = 0;
 436                         }
 437                 }
 438         }
 439         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 440                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 441                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 442                                                         NULL, &devices);
 443                 if (ACPI_FAILURE(status))
 444                         tz->trips.passive.flags.valid = 0;
 445                 else
 446                         tz->trips.passive.flags.valid = 1;
 447
 448                 if (memcmp(&tz->trips.passive.devices, &devices,
 449                                 sizeof(struct acpi_handle_list))) {
 450                         memcpy(&tz->trips.passive.devices, &devices,
 451                                 sizeof(struct acpi_handle_list));
 452                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 453                 }
 454         }
 455         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 456                 if (valid != tz->trips.passive.flags.valid)
 457                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 458         }
 459
 460         /* Active (optional) */
 461         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 462                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 463                 valid = tz->trips.active[i].flags.valid;
 464
 465                 if (act == -1)
 466                         break; /* disable all active trip points */
 467
 468                 if (flag & ACPI_TRIPS_ACTIVE) {
 469                         status = acpi_evaluate_integer(tz->device->handle,
 470                                 name, NULL, &tz->trips.active[i].temperature);
 471                         if (ACPI_FAILURE(status)) {
 472                                 tz->trips.active[i].flags.valid = 0;
 473                                 if (i == 0)
 474                                         break;
 475                                 if (act <= 0)
 476                                         break;
 477                                 if (i == 1)
 478                                         tz->trips.active[0].temperature =
 479                                                 CELSIUS_TO_KELVIN(act);
 480                                 else
 481                                         /*
 482                                          * Don't allow override higher than
 483                                          * the next higher trip point
 484                                          */
 485                                         tz->trips.active[i - 1].temperature =
 486                                                 (tz->trips.active[i - 2].temperature <
 487                                                 CELSIUS_TO_KELVIN(act) ?
 488                                                 tz->trips.active[i - 2].temperature :
 489                                                 CELSIUS_TO_KELVIN(act));
 490                                 break;
 491                         } else
 492                                 tz->trips.active[i].flags.valid = 1;
 493                 }
 494
 495                 name[2] = 'L';
 496                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 497                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 498                         status = acpi_evaluate_reference(tz->device->handle,
 499                                                 name, NULL, &devices);
 500                         if (ACPI_FAILURE(status))
 501                                 tz->trips.active[i].flags.valid = 0;
 502                         else
 503                                 tz->trips.active[i].flags.valid = 1;
 504
 505                         if (memcmp(&tz->trips.active[i].devices, &devices,
 506                                         sizeof(struct acpi_handle_list))) {
 507                                 memcpy(&tz->trips.active[i].devices, &devices,
 508                                         sizeof(struct acpi_handle_list));
 509                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 510                         }
 511                 }
 512                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 513                         if (valid != tz->trips.active[i].flags.valid)
 514                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 515
 516                 if (!tz->trips.active[i].flags.valid)
 517                         break;
 518         }
 519
 520         if (flag & ACPI_TRIPS_DEVICES) {
 521                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 522                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 523                                                 NULL, &devices);
 524                 if (memcmp(&tz->devices, &devices,
 525                                 sizeof(struct acpi_handle_list))) {
 526                         memcpy(&tz->devices, &devices,
 527                                 sizeof(struct acpi_handle_list));
 528                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 529                 }
 530         }
 531
 532         return 0;
 533 }
 534
 535 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 536 {
 537         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 538 }
 539
 540 static int acpi_thermal_critical(struct acpi_thermal *tz)
 541 {
 542         if (!tz || !tz->trips.critical.flags.valid)
 543                 return -EINVAL;
 544
 545         if (tz->temperature >= tz->trips.critical.temperature) {
 546                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 547                 tz->trips.critical.flags.enabled = 1;
 548         } else if (tz->trips.critical.flags.enabled)
 549                 tz->trips.critical.flags.enabled = 0;
 550
 551         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 552                                 tz->trips.critical.flags.enabled);
 553         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 554                                           tz->device->dev.bus_id,
 555                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 556                                           tz->trips.critical.flags.enabled);
 557
 558         /* take no action if nocrt is set */
 559         if(!nocrt) {
 560                 printk(KERN_EMERG
 561                         "Critical temperature reached (%ld C), shutting down.\n",
 562                         KELVIN_TO_CELSIUS(tz->temperature));
 563                 orderly_poweroff(true);
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int acpi_thermal_hot(struct acpi_thermal *tz)
 570 {
 571         if (!tz || !tz->trips.hot.flags.valid)
 572                 return -EINVAL;
 573
 574         if (tz->temperature >= tz->trips.hot.temperature) {
 575                 printk(KERN_WARNING PREFIX "Hot trip point\n");
 576                 tz->trips.hot.flags.enabled = 1;
 577         } else if (tz->trips.hot.flags.enabled)
 578                 tz->trips.hot.flags.enabled = 0;
 579
 580         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
 581                                 tz->trips.hot.flags.enabled);
 582         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 583                                           tz->device->dev.bus_id,
 584                                           ACPI_THERMAL_NOTIFY_HOT,
 585                                           tz->trips.hot.flags.enabled);
 586
 587         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
 588
 589         return 0;
 590 }
 591
 592 static void acpi_thermal_passive(struct acpi_thermal *tz)
 593 {
 594         int result = 1;
 595         struct acpi_thermal_passive *passive = NULL;
 596         int trend = 0;
 597         int i = 0;
 598
 599
 600         if (!tz || !tz->trips.passive.flags.valid)
 601                 return;
 602
 603         passive = &(tz->trips.passive);
 604
 605         /*
 606          * Above Trip?
 607          * -----------
 608          * Calculate the thermal trend (using the passive cooling equation)
 609          * and modify the performance limit for all passive cooling devices
 610          * accordingly.  Note that we assume symmetry.
 611          */
 612         if (tz->temperature >= passive->temperature) {
 613                 trend =
 614                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 615                     (passive->tc2 * (tz->temperature - passive->temperature));
 616                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 617                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 618                                   trend, passive->tc1, tz->temperature,
 619                                   tz->last_temperature, passive->tc2,
 620                                   tz->temperature, passive->temperature));
 621                 passive->flags.enabled = 1;
 622                 /* Heating up? */
 623                 if (trend > 0)
 624                         for (i = 0; i < passive->devices.count; i++)
 625                                 acpi_processor_set_thermal_limit(passive->
 626                                                                  devices.
 627                                                                  handles[i],
 628                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 629                 /* Cooling off? */
 630                 else if (trend < 0) {
 631                         for (i = 0; i < passive->devices.count; i++)
 632                                 /*
 633                                  * assume that we are on highest
 634                                  * freq/lowest thrott and can leave
 635                                  * passive mode, even in error case
 636                                  */
 637                                 if (!acpi_processor_set_thermal_limit
 638                                     (passive->devices.handles[i],
 639                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 640                                         result = 0;
 641                         /*
 642                          * Leave cooling mode, even if the temp might
 643                          * higher than trip point This is because some
 644                          * machines might have long thermal polling
 645                          * frequencies (tsp) defined. We will fall back
 646                          * into passive mode in next cycle (probably quicker)
 647                          */
 648                         if (result) {
 649                                 passive->flags.enabled = 0;
 650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 651                                                   "Disabling passive cooling, still above threshold,"
 652                                                   " but we are cooling down\n"));
 653                         }
 654                 }
 655                 return;
 656         }
 657
 658         /*
 659          * Below Trip?
 660          * -----------
 661          * Implement passive cooling hysteresis to slowly increase performance
 662          * and avoid thrashing around the passive trip point.  Note that we
 663          * assume symmetry.
 664          */
 665         if (!passive->flags.enabled)
 666                 return;
 667         for (i = 0; i < passive->devices.count; i++)
 668                 if (!acpi_processor_set_thermal_limit
 669                     (passive->devices.handles[i],
 670                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 671                         result = 0;
 672         if (result) {
 673                 passive->flags.enabled = 0;
 674                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 675                                   "Disabling passive cooling (zone is cool)\n"));
 676         }
 677 }
 678
 679 static void acpi_thermal_active(struct acpi_thermal *tz)
 680 {
 681         int result = 0;
 682         struct acpi_thermal_active *active = NULL;
 683         int i = 0;
 684         int j = 0;
 685         unsigned long maxtemp = 0;
 686
 687
 688         if (!tz)
 689                 return;
 690
 691         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 692                 active = &(tz->trips.active[i]);
 693                 if (!active || !active->flags.valid)
 694                         break;
 695                 if (tz->temperature >= active->temperature) {
 696                         /*
 697                          * Above Threshold?
 698                          * ----------------
 699                          * If not already enabled, turn ON all cooling devices
 700                          * associated with this active threshold.
 701                          */
 702                         if (active->temperature > maxtemp)
 703                                 tz->state.active_index = i;
 704                         maxtemp = active->temperature;
 705                         if (active->flags.enabled)
 706                                 continue;
 707                         for (j = 0; j < active->devices.count; j++) {
 708                                 result =
 709                                     acpi_bus_set_power(active->devices.
 710                                                        handles[j],
 711                                                        ACPI_STATE_D0);
 712                                 if (result) {
 713                                         printk(KERN_WARNING PREFIX
 714                                                       "Unable to turn cooling device [%p] 'on'\n",
 715                                                       active->devices.
 716                                                       handles[j]);
 717                                         continue;
 718                                 }
 719                                 active->flags.enabled = 1;
 720                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 721                                                   "Cooling device [%p] now 'on'\n",
 722                                                   active->devices.handles[j]));
 723                         }
 724                         continue;
 725                 }
 726                 if (!active->flags.enabled)
 727                         continue;
 728                 /*
 729                  * Below Threshold?
 730                  * ----------------
 731                  * Turn OFF all cooling devices associated with this
 732                  * threshold.
 733                  */
 734                 for (j = 0; j < active->devices.count; j++) {
 735                         result = acpi_bus_set_power(active->devices.handles[j],
 736                                                     ACPI_STATE_D3);
 737                         if (result) {
 738                                 printk(KERN_WARNING PREFIX
 739                                               "Unable to turn cooling device [%p] 'off'\n",
 740                                               active->devices.handles[j]);
 741                                 continue;
 742                         }
 743                         active->flags.enabled = 0;
 744                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 745                                           "Cooling device [%p] now 'off'\n",
 746                                           active->devices.handles[j]));
 747                 }
 748         }
 749 }
 750
 751 static void acpi_thermal_check(void *context);
 752
 753 static void acpi_thermal_run(unsigned long data)
 754 {
 755         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 756         if (!tz->zombie)
 757                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 758 }
 759
 760 static void acpi_thermal_check(void *data)
 761 {
 762         int result = 0;
 763         struct acpi_thermal *tz = data;
 764         unsigned long sleep_time = 0;
 765         unsigned long timeout_jiffies = 0;
 766         int i = 0;
 767         struct acpi_thermal_state state;
 768
 769
 770         if (!tz) {
 771                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
 772                 return;
 773         }
 774
 775         /* Check if someone else is already running */
 776         if (!mutex_trylock(&tz->lock))
 777                 return;
 778
 779         state = tz->state;
 780
 781         result = acpi_thermal_get_temperature(tz);
 782         if (result)
 783                 goto unlock;
 784
 785         if (!tz->tz_enabled)
 786                 goto unlock;
 787
 788         memset(&tz->state, 0, sizeof(tz->state));
 789
 790         /*
 791          * Check Trip Points
 792          * -----------------
 793          * Compare the current temperature to the trip point values to see
 794          * if we've entered one of the thermal policy states.  Note that
 795          * this function determines when a state is entered, but the
 796          * individual policy decides when it is exited (e.g. hysteresis).
 797          */
 798         if (tz->trips.critical.flags.valid)
 799                 state.critical |=
 800                     (tz->temperature >= tz->trips.critical.temperature);
 801         if (tz->trips.hot.flags.valid)
 802                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 803         if (tz->trips.passive.flags.valid)
 804                 state.passive |=
 805                     (tz->temperature >= tz->trips.passive.temperature);
 806         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 807                 if (tz->trips.active[i].flags.valid)
 808                         state.active |=
 809                             (tz->temperature >=
 810                              tz->trips.active[i].temperature);
 811
 812         /*
 813          * Invoke Policy
 814          * -------------
 815          * Separated from the above check to allow individual policy to
 816          * determine when to exit a given state.
 817          */
 818         if (state.critical)
 819                 acpi_thermal_critical(tz);
 820         if (state.hot)
 821                 acpi_thermal_hot(tz);
 822         if (state.passive)
 823                 acpi_thermal_passive(tz);
 824         if (state.active)
 825                 acpi_thermal_active(tz);
 826
 827         /*
 828          * Calculate State
 829          * ---------------
 830          * Again, separated from the above two to allow independent policy
 831          * decisions.
 832          */
 833         tz->state.critical = tz->trips.critical.flags.enabled;
 834         tz->state.hot = tz->trips.hot.flags.enabled;
 835         tz->state.passive = tz->trips.passive.flags.enabled;
 836         tz->state.active = 0;
 837         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 838                 tz->state.active |= tz->trips.active[i].flags.enabled;
 839
 840         /*
 841          * Calculate Sleep Time
 842          * --------------------
 843          * If we're in the passive state, use _TSP's value.  Otherwise
 844          * use the default polling frequency (e.g. _TZP).  If no polling
 845          * frequency is specified then we'll wait forever (at least until
 846          * a thermal event occurs).  Note that _TSP and _TZD values are
 847          * given in 1/10th seconds (we must covert to milliseconds).
 848          */
 849         if (tz->state.passive) {
 850                 sleep_time = tz->trips.passive.tsp * 100;
 851                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
 852         } else if (tz->polling_frequency > 0) {
 853                 sleep_time = tz->polling_frequency * 100;
 854                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
 855         }
 856
 857         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 858                           tz->name, tz->temperature, sleep_time));
 859
 860         /*
 861          * Schedule Next Poll
 862          * ------------------
 863          */
 864         if (!sleep_time) {
 865                 if (timer_pending(&(tz->timer)))
 866                         del_timer(&(tz->timer));
 867         } else {
 868                 if (timer_pending(&(tz->timer)))
 869                         mod_timer(&(tz->timer), timeout_jiffies);
 870                 else {
 871                         tz->timer.data = (unsigned long)tz;
 872                         tz->timer.function = acpi_thermal_run;
 873                         tz->timer.expires = timeout_jiffies;
 874                         add_timer(&(tz->timer));
 875                 }
 876         }
 877       unlock:
 878         mutex_unlock(&tz->lock);
 879 }
 880
 881 /* sys I/F for generic thermal sysfs support */
 882 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 883 {
 884         struct acpi_thermal *tz = thermal->devdata;
 885
 886         if (!tz)
 887                 return -EINVAL;
 888
 889         return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(tz->temperature));
 890 }
 891
 892 static const char enabled[] = "kernel";
 893 static const char disabled[] = "user";
 894 static int thermal_get_mode(struct thermal_zone_device *thermal,
 895                                 char *buf)
 896 {
 897         struct acpi_thermal *tz = thermal->devdata;
 898
 899         if (!tz)
 900                 return -EINVAL;
 901
 902         return sprintf(buf, "%s\n", tz->tz_enabled ?
 903                         enabled : disabled);
 904 }
 905
 906 static int thermal_set_mode(struct thermal_zone_device *thermal,
 907                                 const char *buf)
 908 {
 909         struct acpi_thermal *tz = thermal->devdata;
 910         int enable;
 911
 912         if (!tz)
 913                 return -EINVAL;
 914
 915         /*
 916          * enable/disable thermal management from ACPI thermal driver
 917          */
 918         if (!strncmp(buf, enabled, sizeof enabled - 1))
 919                 enable = 1;
 920         else if (!strncmp(buf, disabled, sizeof disabled - 1))
 921                 enable = 0;
 922         else
 923                 return -EINVAL;
 924
 925         if (enable != tz->tz_enabled) {
 926                 tz->tz_enabled = enable;
 927                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 928                         "%s ACPI thermal control\n",
 929                         tz->tz_enabled ? enabled : disabled));
 930                 acpi_thermal_check(tz);
 931         }
 932         return 0;
 933 }
 934
 935 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 936                                  int trip, char *buf)
 937 {
 938         struct acpi_thermal *tz = thermal->devdata;
 939         int i;
 940
 941         if (!tz || trip < 0)
 942                 return -EINVAL;
 943
 944         if (tz->trips.critical.flags.valid) {
 945                 if (!trip)
 946                         return sprintf(buf, "critical\n");
 947                 trip--;
 948         }
 949
 950         if (tz->trips.hot.flags.valid) {
 951                 if (!trip)
 952                         return sprintf(buf, "hot\n");
 953                 trip--;
 954         }
 955
 956         if (tz->trips.passive.flags.valid) {
 957                 if (!trip)
 958                         return sprintf(buf, "passive\n");
 959                 trip--;
 960         }
 961
 962         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 963                 tz->trips.active[i].flags.valid; i++) {
 964                 if (!trip)
 965                         return sprintf(buf, "active%d\n", i);
 966                 trip--;
 967         }
 968
 969         return -EINVAL;
 970 }
 971
 972 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 973                                  int trip, char *buf)
 974 {
 975         struct acpi_thermal *tz = thermal->devdata;
 976         int i;
 977
 978         if (!tz || trip < 0)
 979                 return -EINVAL;
 980
 981         if (tz->trips.critical.flags.valid) {
 982                 if (!trip)
 983                         return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
 984                                 tz->trips.critical.temperature));
 985                 trip--;
 986         }
 987
 988         if (tz->trips.hot.flags.valid) {
 989                 if (!trip)
 990                         return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
 991                                         tz->trips.hot.temperature));
 992                 trip--;
 993         }
 994
 995         if (tz->trips.passive.flags.valid) {
 996                 if (!trip)
 997                         return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
 998                                         tz->trips.passive.temperature));
 999                 trip--;
1000         }
1001
1002         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1003                 tz->trips.active[i].flags.valid; i++) {
1004                 if (!trip)
1005                         return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
1006                                         tz->trips.active[i].temperature));
1007                 trip--;
1008         }
1009
1010         return -EINVAL;
1011 }
1012
1013 typedef int (*cb)(struct thermal_zone_device *, int,
1014                   struct thermal_cooling_device *);
1015 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1016                                         struct thermal_cooling_device *cdev,
1017                                         cb action)
1018 {
1019         struct acpi_device *device = cdev->devdata;
1020         struct acpi_thermal *tz = thermal->devdata;
1021         struct acpi_device *dev;
1022         acpi_status status;
1023         acpi_handle handle;
1024         int i;
1025         int j;
1026         int trip = -1;
1027         int result = 0;
1028
1029         if (tz->trips.critical.flags.valid)
1030                 trip++;
1031
1032         if (tz->trips.hot.flags.valid)
1033                 trip++;
1034
1035         if (tz->trips.passive.flags.valid) {
1036                 trip++;
1037                 for (i = 0; i < tz->trips.passive.devices.count;
1038                     i++) {
1039                         handle = tz->trips.passive.devices.handles[i];
1040                         status = acpi_bus_get_device(handle, &dev);
1041                         if (ACPI_SUCCESS(status) && (dev == device)) {
1042                                 result = action(thermal, trip, cdev);
1043                                 if (result)
1044                                         goto failed;
1045                         }
1046                 }
1047         }
1048
1049         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1050                 if (!tz->trips.active[i].flags.valid)
1051                         break;
1052                 trip++;
1053                 for (j = 0;
1054                     j < tz->trips.active[i].devices.count;
1055                     j++) {
1056                         handle = tz->trips.active[i].devices.handles[j];
1057                         status = acpi_bus_get_device(handle, &dev);
1058                         if (ACPI_SUCCESS(status) && (dev == device)) {
1059                                 result = action(thermal, trip, cdev);
1060                                 if (result)
1061                                         goto failed;
1062                         }
1063                 }
1064         }
1065
1066         for (i = 0; i < tz->devices.count; i++) {
1067                 handle = tz->devices.handles[i];
1068                 status = acpi_bus_get_device(handle, &dev);
1069                 if (ACPI_SUCCESS(status) && (dev == device)) {
1070                         result = action(thermal, -1, cdev);
1071                         if (result)
1072                                 goto failed;
1073                 }
1074         }
1075
1076 failed:
1077         return result;
1078 }
1079
1080 static int
1081 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1082                                         struct thermal_cooling_device *cdev)
1083 {
1084         return acpi_thermal_cooling_device_cb(thermal, cdev,
1085                                 thermal_zone_bind_cooling_device);
1086 }
1087
1088 static int
1089 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1090                                         struct thermal_cooling_device *cdev)
1091 {
1092         return acpi_thermal_cooling_device_cb(thermal, cdev,
1093                                 thermal_zone_unbind_cooling_device);
1094 }
1095
1096 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1097         .bind = acpi_thermal_bind_cooling_device,
1098         .unbind = acpi_thermal_unbind_cooling_device,
1099         .get_temp = thermal_get_temp,
1100         .get_mode = thermal_get_mode,
1101         .set_mode = thermal_set_mode,
1102         .get_trip_type = thermal_get_trip_type,
1103         .get_trip_temp = thermal_get_trip_temp,
1104 };
1105
1106 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1107 {
1108         int trips = 0;
1109         int result;
1110         acpi_status status;
1111         int i;
1112
1113         if (tz->trips.critical.flags.valid)
1114                 trips++;
1115
1116         if (tz->trips.hot.flags.valid)
1117                 trips++;
1118
1119         if (tz->trips.passive.flags.valid)
1120                 trips++;
1121
1122         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1123                         tz->trips.active[i].flags.valid; i++, trips++);
1124         tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1125                                         trips, tz, &acpi_thermal_zone_ops);
1126         if (!tz->thermal_zone)
1127                 return -ENODEV;
1128
1129         result = sysfs_create_link(&tz->device->dev.kobj,
1130                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1131         if (result)
1132                 return result;
1133
1134         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1135                                    &tz->device->dev.kobj, "device");
1136         if (result)
1137                 return result;
1138
1139         status = acpi_attach_data(tz->device->handle,
1140                                   acpi_bus_private_data_handler,
1141                                   tz->thermal_zone);
1142         if (ACPI_FAILURE(status)) {
1143                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1144                                 "Error attaching device data\n"));
1145                 return -ENODEV;
1146         }
1147
1148         tz->tz_enabled = 1;
1149
1150         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1151                         tz->device->dev.bus_id, tz->thermal_zone->id);
1152         return 0;
1153 }
1154
1155 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1156 {
1157         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1158         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1159         thermal_zone_device_unregister(tz->thermal_zone);
1160         tz->thermal_zone = NULL;
1161         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1162 }
1163
1164
1165 /* --------------------------------------------------------------------------
1166                               FS Interface (/proc)
1167    -------------------------------------------------------------------------- */
1168
1169 static struct proc_dir_entry *acpi_thermal_dir;
1170
1171 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1172 {
1173         struct acpi_thermal *tz = seq->private;
1174
1175
1176         if (!tz)
1177                 goto end;
1178
1179         seq_puts(seq, "state:                   ");
1180
1181         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1182             && !tz->state.active)
1183                 seq_puts(seq, "ok\n");
1184         else {
1185                 if (tz->state.critical)
1186                         seq_puts(seq, "critical ");
1187                 if (tz->state.hot)
1188                         seq_puts(seq, "hot ");
1189                 if (tz->state.passive)
1190                         seq_puts(seq, "passive ");
1191                 if (tz->state.active)
1192                         seq_printf(seq, "active[%d]", tz->state.active_index);
1193                 seq_puts(seq, "\n");
1194         }
1195
1196       end:
1197         return 0;
1198 }
1199
1200 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1201 {
1202         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1203 }
1204
1205 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1206 {
1207         int result = 0;
1208         struct acpi_thermal *tz = seq->private;
1209
1210
1211         if (!tz)
1212                 goto end;
1213
1214         result = acpi_thermal_get_temperature(tz);
1215         if (result)
1216                 goto end;
1217
1218         seq_printf(seq, "temperature:             %ld C\n",
1219                    KELVIN_TO_CELSIUS(tz->temperature));
1220
1221       end:
1222         return 0;
1223 }
1224
1225 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1226 {
1227         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1228 }
1229
1230 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1231 {
1232         struct acpi_thermal *tz = seq->private;
1233         struct acpi_device *device;
1234         acpi_status status;
1235
1236         int i = 0;
1237         int j = 0;
1238
1239
1240         if (!tz)
1241                 goto end;
1242
1243         if (tz->trips.critical.flags.valid)
1244                 seq_printf(seq, "critical (S5):           %ld C%s",
1245                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1246                            nocrt ? " <disabled>\n" : "\n");
1247
1248         if (tz->trips.hot.flags.valid)
1249                 seq_printf(seq, "hot (S4):                %ld C%s",
1250                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1251                            nocrt ? " <disabled>\n" : "\n");
1252
1253         if (tz->trips.passive.flags.valid) {
1254                 seq_printf(seq,
1255                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1256                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1257                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1258                            tz->trips.passive.tsp);
1259                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1260                         status = acpi_bus_get_device(tz->trips.passive.devices.
1261                                                      handles[j], &device);
1262                         seq_printf(seq, "%4.4s ", status ? "" :
1263                                    acpi_device_bid(device));
1264                 }
1265                 seq_puts(seq, "\n");
1266         }
1267
1268         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1269                 if (!(tz->trips.active[i].flags.valid))
1270                         break;
1271                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1272                            i,
1273                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1274                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1275                         status = acpi_bus_get_device(tz->trips.active[i].
1276                                                      devices.handles[j],
1277                                                      &device);
1278                         seq_printf(seq, "%4.4s ", status ? "" :
1279                                    acpi_device_bid(device));
1280                 }
1281                 seq_puts(seq, "\n");
1282         }
1283
1284       end:
1285         return 0;
1286 }
1287
1288 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1289 {
1290         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1291 }
1292
1293 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1294 {
1295         struct acpi_thermal *tz = seq->private;
1296
1297
1298         if (!tz)
1299                 goto end;
1300
1301         if (!tz->flags.cooling_mode)
1302                 seq_puts(seq, "<setting not supported>\n");
1303         else
1304                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1305
1306       end:
1307         return 0;
1308 }
1309
1310 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1311 {
1312         return single_open(file, acpi_thermal_cooling_seq_show,
1313                            PDE(inode)->data);
1314 }
1315
1316 static ssize_t
1317 acpi_thermal_write_cooling_mode(struct file *file,
1318                                 const char __user * buffer,
1319                                 size_t count, loff_t * ppos)
1320 {
1321         struct seq_file *m = file->private_data;
1322         struct acpi_thermal *tz = m->private;
1323         int result = 0;
1324         char mode_string[12] = { '\0' };
1325
1326
1327         if (!tz || (count > sizeof(mode_string) - 1))
1328                 return -EINVAL;
1329
1330         if (!tz->flags.cooling_mode)
1331                 return -ENODEV;
1332
1333         if (copy_from_user(mode_string, buffer, count))
1334                 return -EFAULT;
1335
1336         mode_string[count] = '\0';
1337
1338         result = acpi_thermal_set_cooling_mode(tz,
1339                                                simple_strtoul(mode_string, NULL,
1340                                                               0));
1341         if (result)
1342                 return result;
1343
1344         acpi_thermal_check(tz);
1345
1346         return count;
1347 }
1348
1349 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1350 {
1351         struct acpi_thermal *tz = seq->private;
1352
1353
1354         if (!tz)
1355                 goto end;
1356
1357         if (!tz->polling_frequency) {
1358                 seq_puts(seq, "<polling disabled>\n");
1359                 goto end;
1360         }
1361
1362         seq_printf(seq, "polling frequency:       %lu seconds\n",
1363                    (tz->polling_frequency / 10));
1364
1365       end:
1366         return 0;
1367 }
1368
1369 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1370 {
1371         return single_open(file, acpi_thermal_polling_seq_show,
1372                            PDE(inode)->data);
1373 }
1374
1375 static ssize_t
1376 acpi_thermal_write_polling(struct file *file,
1377                            const char __user * buffer,
1378                            size_t count, loff_t * ppos)
1379 {
1380         struct seq_file *m = file->private_data;
1381         struct acpi_thermal *tz = m->private;
1382         int result = 0;
1383         char polling_string[12] = { '\0' };
1384         int seconds = 0;
1385
1386
1387         if (!tz || (count > sizeof(polling_string) - 1))
1388                 return -EINVAL;
1389
1390         if (copy_from_user(polling_string, buffer, count))
1391                 return -EFAULT;
1392
1393         polling_string[count] = '\0';
1394
1395         seconds = simple_strtoul(polling_string, NULL, 0);
1396
1397         result = acpi_thermal_set_polling(tz, seconds);
1398         if (result)
1399                 return result;
1400
1401         acpi_thermal_check(tz);
1402
1403         return count;
1404 }
1405
1406 static int acpi_thermal_add_fs(struct acpi_device *device)
1407 {
1408         struct proc_dir_entry *entry = NULL;
1409
1410
1411         if (!acpi_device_dir(device)) {
1412                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1413                                                      acpi_thermal_dir);
1414                 if (!acpi_device_dir(device))
1415                         return -ENODEV;
1416                 acpi_device_dir(device)->owner = THIS_MODULE;
1417         }
1418
1419         /* 'state' [R] */
1420         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1421                                   S_IRUGO, acpi_device_dir(device));
1422         if (!entry)
1423                 return -ENODEV;
1424         else {
1425                 entry->proc_fops = &acpi_thermal_state_fops;
1426                 entry->data = acpi_driver_data(device);
1427                 entry->owner = THIS_MODULE;
1428         }
1429
1430         /* 'temperature' [R] */
1431         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1432                                   S_IRUGO, acpi_device_dir(device));
1433         if (!entry)
1434                 return -ENODEV;
1435         else {
1436                 entry->proc_fops = &acpi_thermal_temp_fops;
1437                 entry->data = acpi_driver_data(device);
1438                 entry->owner = THIS_MODULE;
1439         }
1440
1441         /* 'trip_points' [R] */
1442         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1443                                   S_IRUGO,
1444                                   acpi_device_dir(device));
1445         if (!entry)
1446                 return -ENODEV;
1447         else {
1448                 entry->proc_fops = &acpi_thermal_trip_fops;
1449                 entry->data = acpi_driver_data(device);
1450                 entry->owner = THIS_MODULE;
1451         }
1452
1453         /* 'cooling_mode' [R/W] */
1454         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1455                                   S_IFREG | S_IRUGO | S_IWUSR,
1456                                   acpi_device_dir(device));
1457         if (!entry)
1458                 return -ENODEV;
1459         else {
1460                 entry->proc_fops = &acpi_thermal_cooling_fops;
1461                 entry->data = acpi_driver_data(device);
1462                 entry->owner = THIS_MODULE;
1463         }
1464
1465         /* 'polling_frequency' [R/W] */
1466         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1467                                   S_IFREG | S_IRUGO | S_IWUSR,
1468                                   acpi_device_dir(device));
1469         if (!entry)
1470                 return -ENODEV;
1471         else {
1472                 entry->proc_fops = &acpi_thermal_polling_fops;
1473                 entry->data = acpi_driver_data(device);
1474                 entry->owner = THIS_MODULE;
1475         }
1476
1477         return 0;
1478 }
1479
1480 static int acpi_thermal_remove_fs(struct acpi_device *device)
1481 {
1482
1483         if (acpi_device_dir(device)) {
1484                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1485                                   acpi_device_dir(device));
1486                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1487                                   acpi_device_dir(device));
1488                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1489                                   acpi_device_dir(device));
1490                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1491                                   acpi_device_dir(device));
1492                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1493                                   acpi_device_dir(device));
1494                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1495                 acpi_device_dir(device) = NULL;
1496         }
1497
1498         return 0;
1499 }
1500
1501 /* --------------------------------------------------------------------------
1502                                  Driver Interface
1503    -------------------------------------------------------------------------- */
1504
1505 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1506 {
1507         struct acpi_thermal *tz = data;
1508         struct acpi_device *device = NULL;
1509
1510
1511         if (!tz)
1512                 return;
1513
1514         device = tz->device;
1515
1516         switch (event) {
1517         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1518                 acpi_thermal_check(tz);
1519                 break;
1520         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1521                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1522                 acpi_thermal_check(tz);
1523                 acpi_bus_generate_proc_event(device, event, 0);
1524                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1525                                                   device->dev.bus_id, event, 0);
1526                 break;
1527         case ACPI_THERMAL_NOTIFY_DEVICES:
1528                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1529                 acpi_thermal_check(tz);
1530                 acpi_bus_generate_proc_event(device, event, 0);
1531                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1532                                                   device->dev.bus_id, event, 0);
1533                 break;
1534         default:
1535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1536                                   "Unsupported event [0x%x]\n", event));
1537                 break;
1538         }
1539
1540         return;
1541 }
1542
1543 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1544 {
1545         int result = 0;
1546
1547
1548         if (!tz)
1549                 return -EINVAL;
1550
1551         /* Get temperature [_TMP] (required) */
1552         result = acpi_thermal_get_temperature(tz);
1553         if (result)
1554                 return result;
1555
1556         /* Get trip points [_CRT, _PSV, etc.] (required) */
1557         result = acpi_thermal_get_trip_points(tz);
1558         if (result)
1559                 return result;
1560
1561         /* Set the cooling mode [_SCP] to active cooling (default) */
1562         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1563         if (!result)
1564                 tz->flags.cooling_mode = 1;
1565
1566         /* Get default polling frequency [_TZP] (optional) */
1567         if (tzp)
1568                 tz->polling_frequency = tzp;
1569         else
1570                 acpi_thermal_get_polling_frequency(tz);
1571
1572         return 0;
1573 }
1574
1575 static int acpi_thermal_add(struct acpi_device *device)
1576 {
1577         int result = 0;
1578         acpi_status status = AE_OK;
1579         struct acpi_thermal *tz = NULL;
1580
1581
1582         if (!device)
1583                 return -EINVAL;
1584
1585         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1586         if (!tz)
1587                 return -ENOMEM;
1588
1589         tz->device = device;
1590         strcpy(tz->name, device->pnp.bus_id);
1591         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1592         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1593         acpi_driver_data(device) = tz;
1594         mutex_init(&tz->lock);
1595
1596
1597         result = acpi_thermal_get_info(tz);
1598         if (result)
1599                 goto free_memory;
1600
1601         result = acpi_thermal_register_thermal_zone(tz);
1602         if (result)
1603                 goto free_memory;
1604
1605         result = acpi_thermal_add_fs(device);
1606         if (result)
1607                 goto unregister_thermal_zone;
1608
1609         init_timer(&tz->timer);
1610
1611         acpi_thermal_check(tz);
1612
1613         status = acpi_install_notify_handler(device->handle,
1614                                              ACPI_DEVICE_NOTIFY,
1615                                              acpi_thermal_notify, tz);
1616         if (ACPI_FAILURE(status)) {
1617                 result = -ENODEV;
1618                 goto remove_fs;
1619         }
1620
1621         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1622                acpi_device_name(device), acpi_device_bid(device),
1623                KELVIN_TO_CELSIUS(tz->temperature));
1624         goto end;
1625
1626 remove_fs:
1627         acpi_thermal_remove_fs(device);
1628 unregister_thermal_zone:
1629         thermal_zone_device_unregister(tz->thermal_zone);
1630 free_memory:
1631         kfree(tz);
1632 end:
1633         return result;
1634 }
1635
1636 static int acpi_thermal_remove(struct acpi_device *device, int type)
1637 {
1638         acpi_status status = AE_OK;
1639         struct acpi_thermal *tz = NULL;
1640
1641
1642         if (!device || !acpi_driver_data(device))
1643                 return -EINVAL;
1644
1645         tz = acpi_driver_data(device);
1646
1647         /* avoid timer adding new defer task */
1648         tz->zombie = 1;
1649         /* wait for running timer (on other CPUs) finish */
1650         del_timer_sync(&(tz->timer));
1651         /* synchronize deferred task */
1652         acpi_os_wait_events_complete(NULL);
1653         /* deferred task may reinsert timer */
1654         del_timer_sync(&(tz->timer));
1655
1656         status = acpi_remove_notify_handler(device->handle,
1657                                             ACPI_DEVICE_NOTIFY,
1658                                             acpi_thermal_notify);
1659
1660         /* Terminate policy */
1661         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1662                 tz->trips.passive.flags.enabled = 0;
1663                 acpi_thermal_passive(tz);
1664         }
1665         if (tz->trips.active[0].flags.valid
1666             && tz->trips.active[0].flags.enabled) {
1667                 tz->trips.active[0].flags.enabled = 0;
1668                 acpi_thermal_active(tz);
1669         }
1670
1671         acpi_thermal_remove_fs(device);
1672         acpi_thermal_unregister_thermal_zone(tz);
1673         mutex_destroy(&tz->lock);
1674         kfree(tz);
1675         return 0;
1676 }
1677
1678 static int acpi_thermal_resume(struct acpi_device *device)
1679 {
1680         struct acpi_thermal *tz = NULL;
1681         int i, j, power_state, result;
1682
1683
1684         if (!device || !acpi_driver_data(device))
1685                 return -EINVAL;
1686
1687         tz = acpi_driver_data(device);
1688
1689         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1690                 if (!(&tz->trips.active[i]))
1691                         break;
1692                 if (!tz->trips.active[i].flags.valid)
1693                         break;
1694                 tz->trips.active[i].flags.enabled = 1;
1695                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1696                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1697                             handles[j], &power_state);
1698                         if (result || (power_state != ACPI_STATE_D0)) {
1699                                 tz->trips.active[i].flags.enabled = 0;
1700                                 break;
1701                         }
1702                 }
1703                 tz->state.active |= tz->trips.active[i].flags.enabled;
1704         }
1705
1706         acpi_thermal_check(tz);
1707
1708         return AE_OK;
1709 }
1710
1711 #ifdef CONFIG_DMI
1712 static int thermal_act(const struct dmi_system_id *d) {
1713
1714         if (act == 0) {
1715                 printk(KERN_NOTICE "ACPI: %s detected: "
1716                         "disabling all active thermal trip points\n", d->ident);
1717                 act = -1;
1718         }
1719         return 0;
1720 }
1721 static int thermal_nocrt(const struct dmi_system_id *d) {
1722
1723         printk(KERN_NOTICE "ACPI: %s detected: "
1724                 "disabling all critical thermal trip point actions.\n", d->ident);
1725         nocrt = 1;
1726         return 0;
1727 }
1728 static int thermal_tzp(const struct dmi_system_id *d) {
1729
1730         if (tzp == 0) {
1731                 printk(KERN_NOTICE "ACPI: %s detected: "
1732                         "enabling thermal zone polling\n", d->ident);
1733                 tzp = 300;      /* 300 dS = 30 Seconds */
1734         }
1735         return 0;
1736 }
1737 static int thermal_psv(const struct dmi_system_id *d) {
1738
1739         if (psv == 0) {
1740                 printk(KERN_NOTICE "ACPI: %s detected: "
1741                         "disabling all passive thermal trip points\n", d->ident);
1742                 psv = -1;
1743         }
1744         return 0;
1745 }
1746
1747 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1748         /*
1749          * Award BIOS on this AOpen makes thermal control almost worthless.
1750          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1751          */
1752         {
1753          .callback = thermal_act,
1754          .ident = "AOpen i915GMm-HFS",
1755          .matches = {
1756                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1757                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1758                 },
1759         },
1760         {
1761          .callback = thermal_psv,
1762          .ident = "AOpen i915GMm-HFS",
1763          .matches = {
1764                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1765                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1766                 },
1767         },
1768         {
1769          .callback = thermal_tzp,
1770          .ident = "AOpen i915GMm-HFS",
1771          .matches = {
1772                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1773                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1774                 },
1775         },
1776         {
1777          .callback = thermal_nocrt,
1778          .ident = "Gigabyte GA-7ZX",
1779          .matches = {
1780                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1781                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1782                 },
1783         },
1784         {}
1785 };
1786 #endif /* CONFIG_DMI */
1787
1788 static int __init acpi_thermal_init(void)
1789 {
1790         int result = 0;
1791
1792         dmi_check_system(thermal_dmi_table);
1793
1794         if (off) {
1795                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1796                 return -ENODEV;
1797         }
1798         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1799         if (!acpi_thermal_dir)
1800                 return -ENODEV;
1801         acpi_thermal_dir->owner = THIS_MODULE;
1802
1803         result = acpi_bus_register_driver(&acpi_thermal_driver);
1804         if (result < 0) {
1805                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1806                 return -ENODEV;
1807         }
1808
1809         return 0;
1810 }
1811
1812 static void __exit acpi_thermal_exit(void)
1813 {
1814
1815         acpi_bus_unregister_driver(&acpi_thermal_driver);
1816
1817         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1818
1819         return;
1820 }
1821
1822 module_init(acpi_thermal_init);
1823 module_exit(acpi_thermal_exit);