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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 KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  70
  71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  72 ACPI_MODULE_NAME("thermal");
  73
  74 MODULE_AUTHOR("Paul Diefenbaugh");
  75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int act;
  79 module_param(act, int, 0644);
  80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  81
  82 static int crt;
  83 module_param(crt, int, 0644);
  84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  85
  86 static int tzp;
  87 module_param(tzp, int, 0444);
  88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  89
  90 static int nocrt;
  91 module_param(nocrt, int, 0);
  92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  93
  94 static int off;
  95 module_param(off, int, 0);
  96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  97
  98 static int psv;
  99 module_param(psv, int, 0644);
 100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 101
 102 static int acpi_thermal_add(struct acpi_device *device);
 103 static int acpi_thermal_remove(struct acpi_device *device, int type);
 104 static int acpi_thermal_resume(struct acpi_device *device);
 105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 110                                                const char __user *, size_t,
 111                                                loff_t *);
 112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 114                                           size_t, loff_t *);
 115
 116 static const struct acpi_device_id  thermal_device_ids[] = {
 117         {ACPI_THERMAL_HID, 0},
 118         {"", 0},
 119 };
 120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 121
 122 static struct acpi_driver acpi_thermal_driver = {
 123         .name = "thermal",
 124         .class = ACPI_THERMAL_CLASS,
 125         .ids = thermal_device_ids,
 126         .ops = {
 127                 .add = acpi_thermal_add,
 128                 .remove = acpi_thermal_remove,
 129                 .resume = acpi_thermal_resume,
 130                 },
 131 };
 132
 133 struct acpi_thermal_state {
 134         u8 critical:1;
 135         u8 hot:1;
 136         u8 passive:1;
 137         u8 active:1;
 138         u8 reserved:4;
 139         int active_index;
 140 };
 141
 142 struct acpi_thermal_state_flags {
 143         u8 valid:1;
 144         u8 enabled:1;
 145         u8 reserved:6;
 146 };
 147
 148 struct acpi_thermal_critical {
 149         struct acpi_thermal_state_flags flags;
 150         unsigned long temperature;
 151 };
 152
 153 struct acpi_thermal_hot {
 154         struct acpi_thermal_state_flags flags;
 155         unsigned long temperature;
 156 };
 157
 158 struct acpi_thermal_passive {
 159         struct acpi_thermal_state_flags flags;
 160         unsigned long temperature;
 161         unsigned long tc1;
 162         unsigned long tc2;
 163         unsigned long tsp;
 164         struct acpi_handle_list devices;
 165 };
 166
 167 struct acpi_thermal_active {
 168         struct acpi_thermal_state_flags flags;
 169         unsigned long temperature;
 170         struct acpi_handle_list devices;
 171 };
 172
 173 struct acpi_thermal_trips {
 174         struct acpi_thermal_critical critical;
 175         struct acpi_thermal_hot hot;
 176         struct acpi_thermal_passive passive;
 177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 178 };
 179
 180 struct acpi_thermal_flags {
 181         u8 cooling_mode:1;      /* _SCP */
 182         u8 devices:1;           /* _TZD */
 183         u8 reserved:6;
 184 };
 185
 186 struct acpi_thermal {
 187         struct acpi_device * device;
 188         acpi_bus_id name;
 189         unsigned long temperature;
 190         unsigned long last_temperature;
 191         unsigned long polling_frequency;
 192         volatile u8 zombie;
 193         struct acpi_thermal_flags flags;
 194         struct acpi_thermal_state state;
 195         struct acpi_thermal_trips trips;
 196         struct acpi_handle_list devices;
 197         struct timer_list timer;
 198         struct thermal_zone_device *thermal_zone;
 199         int tz_enabled;
 200         struct mutex lock;
 201 };
 202
 203 static const struct file_operations acpi_thermal_state_fops = {
 204         .open = acpi_thermal_state_open_fs,
 205         .read = seq_read,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 static const struct file_operations acpi_thermal_temp_fops = {
 211         .open = acpi_thermal_temp_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 static const struct file_operations acpi_thermal_trip_fops = {
 218         .open = acpi_thermal_trip_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static const struct file_operations acpi_thermal_cooling_fops = {
 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         .open = acpi_thermal_polling_open_fs,
 234         .read = seq_read,
 235         .write = acpi_thermal_write_polling,
 236         .llseek = seq_lseek,
 237         .release = single_release,
 238 };
 239
 240 /* --------------------------------------------------------------------------
 241                              Thermal Zone Management
 242    -------------------------------------------------------------------------- */
 243
 244 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 245 {
 246         acpi_status status = AE_OK;
 247
 248
 249         if (!tz)
 250                 return -EINVAL;
 251
 252         tz->last_temperature = tz->temperature;
 253
 254         status =
 255             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
 256         if (ACPI_FAILURE(status))
 257                 return -ENODEV;
 258
 259         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 260                           tz->temperature));
 261
 262         return 0;
 263 }
 264
 265 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 266 {
 267         acpi_status status = AE_OK;
 268
 269
 270         if (!tz)
 271                 return -EINVAL;
 272
 273         status =
 274             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
 275                                   &tz->polling_frequency);
 276         if (ACPI_FAILURE(status))
 277                 return -ENODEV;
 278
 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         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 294                           "Polling frequency set to %lu seconds\n",
 295                           tz->polling_frequency/10));
 296
 297         return 0;
 298 }
 299
 300 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 301 {
 302         acpi_status status = AE_OK;
 303         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 304         struct acpi_object_list arg_list = { 1, &arg0 };
 305         acpi_handle handle = NULL;
 306
 307
 308         if (!tz)
 309                 return -EINVAL;
 310
 311         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 312         if (ACPI_FAILURE(status)) {
 313                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 314                 return -ENODEV;
 315         }
 316
 317         arg0.integer.value = mode;
 318
 319         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 320         if (ACPI_FAILURE(status))
 321                 return -ENODEV;
 322
 323         return 0;
 324 }
 325
 326 #define ACPI_TRIPS_CRITICAL     0x01
 327 #define ACPI_TRIPS_HOT          0x02
 328 #define ACPI_TRIPS_PASSIVE      0x04
 329 #define ACPI_TRIPS_ACTIVE       0x08
 330 #define ACPI_TRIPS_DEVICES      0x10
 331
 332 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 333 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 334
 335 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 336                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 337                               ACPI_TRIPS_DEVICES)
 338
 339 /*
 340  * This exception is thrown out in two cases:
 341  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 342  *   when re-evaluating the AML code.
 343  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 344  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 345  */
 346 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 347 do {    \
 348         if (flags != ACPI_TRIPS_INIT)   \
 349                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 350                 "ACPI thermal trip point %s changed\n"  \
 351                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 352 } while (0)
 353
 354 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 355 {
 356         acpi_status status = AE_OK;
 357         struct acpi_handle_list devices;
 358         int valid = 0;
 359         int i;
 360
 361         /* Critical Shutdown (required) */
 362         if (flag & ACPI_TRIPS_CRITICAL) {
 363                 status = acpi_evaluate_integer(tz->device->handle,
 364                                 "_CRT", NULL, &tz->trips.critical.temperature);
 365                 if (ACPI_FAILURE(status)) {
 366                         tz->trips.critical.flags.valid = 0;
 367                         ACPI_EXCEPTION((AE_INFO, status,
 368                                         "No critical threshold"));
 369                         return -ENODEV;
 370                 } else {
 371                         tz->trips.critical.flags.valid = 1;
 372                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 373                                         "Found critical threshold [%lu]\n",
 374                                         tz->trips.critical.temperature));
 375                 }
 376                 if (tz->trips.critical.flags.valid == 1) {
 377                         if (crt == -1) {
 378                                 tz->trips.critical.flags.valid = 0;
 379                         } else if (crt > 0) {
 380                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 381                                 /*
 382                                  * Allow override to lower critical threshold
 383                                  */
 384                                 if (crt_k < tz->trips.critical.temperature)
 385                                         tz->trips.critical.temperature = crt_k;
 386                         }
 387                 }
 388         }
 389
 390         /* Critical Sleep (optional) */
 391         if (flag & ACPI_TRIPS_HOT) {
 392                 status = acpi_evaluate_integer(tz->device->handle,
 393                                 "_HOT", NULL, &tz->trips.hot.temperature);
 394                 if (ACPI_FAILURE(status)) {
 395                         tz->trips.hot.flags.valid = 0;
 396                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 397                                         "No hot threshold\n"));
 398                 } else {
 399                         tz->trips.hot.flags.valid = 1;
 400                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 401                                         "Found hot threshold [%lu]\n",
 402                                         tz->trips.critical.temperature));
 403                 }
 404         }
 405
 406         /* Passive (optional) */
 407         if (flag & ACPI_TRIPS_PASSIVE) {
 408                 valid = tz->trips.passive.flags.valid;
 409                 if (psv == -1) {
 410                         status = AE_SUPPORT;
 411                 } else if (psv > 0) {
 412                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
 413                         status = AE_OK;
 414                 } else {
 415                         status = acpi_evaluate_integer(tz->device->handle,
 416                                 "_PSV", NULL, &tz->trips.passive.temperature);
 417                 }
 418
 419                 if (ACPI_FAILURE(status))
 420                         tz->trips.passive.flags.valid = 0;
 421                 else {
 422                         tz->trips.passive.flags.valid = 1;
 423                         if (flag == ACPI_TRIPS_INIT) {
 424                                 status = acpi_evaluate_integer(
 425                                                 tz->device->handle, "_TC1",
 426                                                 NULL, &tz->trips.passive.tc1);
 427                                 if (ACPI_FAILURE(status))
 428                                         tz->trips.passive.flags.valid = 0;
 429                                 status = acpi_evaluate_integer(
 430                                                 tz->device->handle, "_TC2",
 431                                                 NULL, &tz->trips.passive.tc2);
 432                                 if (ACPI_FAILURE(status))
 433                                         tz->trips.passive.flags.valid = 0;
 434                                 status = acpi_evaluate_integer(
 435                                                 tz->device->handle, "_TSP",
 436                                                 NULL, &tz->trips.passive.tsp);
 437                                 if (ACPI_FAILURE(status))
 438                                         tz->trips.passive.flags.valid = 0;
 439                         }
 440                 }
 441         }
 442         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 443                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 444                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 445                                                         NULL, &devices);
 446                 if (ACPI_FAILURE(status))
 447                         tz->trips.passive.flags.valid = 0;
 448                 else
 449                         tz->trips.passive.flags.valid = 1;
 450
 451                 if (memcmp(&tz->trips.passive.devices, &devices,
 452                                 sizeof(struct acpi_handle_list))) {
 453                         memcpy(&tz->trips.passive.devices, &devices,
 454                                 sizeof(struct acpi_handle_list));
 455                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 456                 }
 457         }
 458         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 459                 if (valid != tz->trips.passive.flags.valid)
 460                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 461         }
 462
 463         /* Active (optional) */
 464         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 465                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 466                 valid = tz->trips.active[i].flags.valid;
 467
 468                 if (act == -1)
 469                         break; /* disable all active trip points */
 470
 471                 if (flag & ACPI_TRIPS_ACTIVE) {
 472                         status = acpi_evaluate_integer(tz->device->handle,
 473                                 name, NULL, &tz->trips.active[i].temperature);
 474                         if (ACPI_FAILURE(status)) {
 475                                 tz->trips.active[i].flags.valid = 0;
 476                                 if (i == 0)
 477                                         break;
 478                                 if (act <= 0)
 479                                         break;
 480                                 if (i == 1)
 481                                         tz->trips.active[0].temperature =
 482                                                 CELSIUS_TO_KELVIN(act);
 483                                 else
 484                                         /*
 485                                          * Don't allow override higher than
 486                                          * the next higher trip point
 487                                          */
 488                                         tz->trips.active[i - 1].temperature =
 489                                                 (tz->trips.active[i - 2].temperature <
 490                                                 CELSIUS_TO_KELVIN(act) ?
 491                                                 tz->trips.active[i - 2].temperature :
 492                                                 CELSIUS_TO_KELVIN(act));
 493                                 break;
 494                         } else
 495                                 tz->trips.active[i].flags.valid = 1;
 496                 }
 497
 498                 name[2] = 'L';
 499                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 500                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 501                         status = acpi_evaluate_reference(tz->device->handle,
 502                                                 name, NULL, &devices);
 503                         if (ACPI_FAILURE(status))
 504                                 tz->trips.active[i].flags.valid = 0;
 505                         else
 506                                 tz->trips.active[i].flags.valid = 1;
 507
 508                         if (memcmp(&tz->trips.active[i].devices, &devices,
 509                                         sizeof(struct acpi_handle_list))) {
 510                                 memcpy(&tz->trips.active[i].devices, &devices,
 511                                         sizeof(struct acpi_handle_list));
 512                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 513                         }
 514                 }
 515                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 516                         if (valid != tz->trips.active[i].flags.valid)
 517                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 518
 519                 if (!tz->trips.active[i].flags.valid)
 520                         break;
 521         }
 522
 523         if (flag & ACPI_TRIPS_DEVICES) {
 524                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 525                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 526                                                 NULL, &devices);
 527                 if (memcmp(&tz->devices, &devices,
 528                                 sizeof(struct acpi_handle_list))) {
 529                         memcpy(&tz->devices, &devices,
 530                                 sizeof(struct acpi_handle_list));
 531                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 532                 }
 533         }
 534
 535         return 0;
 536 }
 537
 538 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 539 {
 540         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 541 }
 542
 543 static int acpi_thermal_critical(struct acpi_thermal *tz)
 544 {
 545         if (!tz || !tz->trips.critical.flags.valid || nocrt)
 546                 return -EINVAL;
 547
 548         if (tz->temperature >= tz->trips.critical.temperature) {
 549                 printk(KERN_WARNING PREFIX "Critical trip point\n");
 550                 tz->trips.critical.flags.enabled = 1;
 551         } else if (tz->trips.critical.flags.enabled)
 552                 tz->trips.critical.flags.enabled = 0;
 553
 554         printk(KERN_EMERG
 555                "Critical temperature reached (%ld C), shutting down.\n",
 556                KELVIN_TO_CELSIUS(tz->temperature));
 557         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
 558                                 tz->trips.critical.flags.enabled);
 559         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 560                                           tz->device->dev.bus_id,
 561                                           ACPI_THERMAL_NOTIFY_CRITICAL,
 562                                           tz->trips.critical.flags.enabled);
 563
 564         orderly_poweroff(true);
 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 || nocrt)
 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 */
 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         acpi_handle handle = device->handle;
1022         int i;
1023         int j;
1024         int trip = -1;
1025         int result = 0;
1026
1027         if (tz->trips.critical.flags.valid)
1028                 trip++;
1029
1030         if (tz->trips.hot.flags.valid)
1031                 trip++;
1032
1033         if (tz->trips.passive.flags.valid) {
1034                 trip++;
1035                 for (i = 0; i < tz->trips.passive.devices.count;
1036                     i++) {
1037                         if (tz->trips.passive.devices.handles[i] !=
1038                                 handle)
1039                                 continue;
1040                         result = action(thermal, trip, cdev);
1041                         if (result)
1042                                 goto failed;
1043                 }
1044         }
1045
1046         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1047                 if (!tz->trips.active[i].flags.valid)
1048                         break;
1049                 trip++;
1050                 for (j = 0;
1051                     j < tz->trips.active[i].devices.count;
1052                     j++) {
1053                         if (tz->trips.active[i].devices.
1054                                                 handles[j] != handle)
1055                                 continue;
1056                         result = action(thermal, trip, cdev);
1057                         if (result)
1058                                 goto failed;
1059                 }
1060         }
1061
1062         for (i = 0; i < tz->devices.count; i++) {
1063                 if (tz->devices.handles[i] != handle)
1064                         continue;
1065                 result = action(thermal, -1, cdev);
1066                 if (result)
1067                         goto failed;
1068         }
1069
1070 failed:
1071         return result;
1072 }
1073
1074 static int
1075 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1076                                         struct thermal_cooling_device *cdev)
1077 {
1078         return acpi_thermal_cooling_device_cb(thermal, cdev,
1079                                 thermal_zone_bind_cooling_device);
1080 }
1081
1082 static int
1083 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1084                                         struct thermal_cooling_device *cdev)
1085 {
1086         return acpi_thermal_cooling_device_cb(thermal, cdev,
1087                                 thermal_zone_unbind_cooling_device);
1088 }
1089
1090 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1091         .bind = acpi_thermal_bind_cooling_device,
1092         .unbind = acpi_thermal_unbind_cooling_device,
1093         .get_temp = thermal_get_temp,
1094         .get_mode = thermal_get_mode,
1095         .set_mode = thermal_set_mode,
1096         .get_trip_type = thermal_get_trip_type,
1097         .get_trip_temp = thermal_get_trip_temp,
1098 };
1099
1100 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1101 {
1102         int trips = 0;
1103         int result;
1104         int i;
1105
1106         if (tz->trips.critical.flags.valid)
1107                 trips++;
1108
1109         if (tz->trips.hot.flags.valid)
1110                 trips++;
1111
1112         if (tz->trips.passive.flags.valid)
1113                 trips++;
1114
1115         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1116                         tz->trips.active[i].flags.valid; i++, trips++);
1117         tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1118                                         trips, tz, &acpi_thermal_zone_ops);
1119         if (!tz->thermal_zone)
1120                 return -ENODEV;
1121
1122         result = sysfs_create_link(&tz->device->dev.kobj,
1123                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1124         if (result)
1125                 return result;
1126
1127         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1128                                    &tz->device->dev.kobj, "device");
1129         if (result)
1130                 return result;
1131
1132         tz->tz_enabled = 1;
1133
1134         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1135                         tz->device->dev.bus_id, tz->thermal_zone->id);
1136         return 0;
1137 }
1138
1139 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1140 {
1141         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1142         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1143         thermal_zone_device_unregister(tz->thermal_zone);
1144         tz->thermal_zone = NULL;
1145 }
1146
1147
1148 /* --------------------------------------------------------------------------
1149                               FS Interface (/proc)
1150    -------------------------------------------------------------------------- */
1151
1152 static struct proc_dir_entry *acpi_thermal_dir;
1153
1154 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1155 {
1156         struct acpi_thermal *tz = seq->private;
1157
1158
1159         if (!tz)
1160                 goto end;
1161
1162         seq_puts(seq, "state:                   ");
1163
1164         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1165             && !tz->state.active)
1166                 seq_puts(seq, "ok\n");
1167         else {
1168                 if (tz->state.critical)
1169                         seq_puts(seq, "critical ");
1170                 if (tz->state.hot)
1171                         seq_puts(seq, "hot ");
1172                 if (tz->state.passive)
1173                         seq_puts(seq, "passive ");
1174                 if (tz->state.active)
1175                         seq_printf(seq, "active[%d]", tz->state.active_index);
1176                 seq_puts(seq, "\n");
1177         }
1178
1179       end:
1180         return 0;
1181 }
1182
1183 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1184 {
1185         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1186 }
1187
1188 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1189 {
1190         int result = 0;
1191         struct acpi_thermal *tz = seq->private;
1192
1193
1194         if (!tz)
1195                 goto end;
1196
1197         result = acpi_thermal_get_temperature(tz);
1198         if (result)
1199                 goto end;
1200
1201         seq_printf(seq, "temperature:             %ld C\n",
1202                    KELVIN_TO_CELSIUS(tz->temperature));
1203
1204       end:
1205         return 0;
1206 }
1207
1208 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1209 {
1210         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1211 }
1212
1213 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1214 {
1215         struct acpi_thermal *tz = seq->private;
1216         struct acpi_device *device;
1217         acpi_status status;
1218
1219         int i = 0;
1220         int j = 0;
1221
1222
1223         if (!tz)
1224                 goto end;
1225
1226         if (tz->trips.critical.flags.valid)
1227                 seq_printf(seq, "critical (S5):           %ld C%s",
1228                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1229                            nocrt ? " <disabled>\n" : "\n");
1230
1231         if (tz->trips.hot.flags.valid)
1232                 seq_printf(seq, "hot (S4):                %ld C%s",
1233                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1234                            nocrt ? " <disabled>\n" : "\n");
1235
1236         if (tz->trips.passive.flags.valid) {
1237                 seq_printf(seq,
1238                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1239                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1240                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1241                            tz->trips.passive.tsp);
1242                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1243                         status = acpi_bus_get_device(tz->trips.passive.devices.
1244                                                      handles[j], &device);
1245                         seq_printf(seq, "%4.4s ", status ? "" :
1246                                    acpi_device_bid(device));
1247                 }
1248                 seq_puts(seq, "\n");
1249         }
1250
1251         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1252                 if (!(tz->trips.active[i].flags.valid))
1253                         break;
1254                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1255                            i,
1256                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1257                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1258                         status = acpi_bus_get_device(tz->trips.active[i].
1259                                                      devices.handles[j],
1260                                                      &device);
1261                         seq_printf(seq, "%4.4s ", status ? "" :
1262                                    acpi_device_bid(device));
1263                 }
1264                 seq_puts(seq, "\n");
1265         }
1266
1267       end:
1268         return 0;
1269 }
1270
1271 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1272 {
1273         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1274 }
1275
1276 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1277 {
1278         struct acpi_thermal *tz = seq->private;
1279
1280
1281         if (!tz)
1282                 goto end;
1283
1284         if (!tz->flags.cooling_mode)
1285                 seq_puts(seq, "<setting not supported>\n");
1286         else
1287                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1288
1289       end:
1290         return 0;
1291 }
1292
1293 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1294 {
1295         return single_open(file, acpi_thermal_cooling_seq_show,
1296                            PDE(inode)->data);
1297 }
1298
1299 static ssize_t
1300 acpi_thermal_write_cooling_mode(struct file *file,
1301                                 const char __user * buffer,
1302                                 size_t count, loff_t * ppos)
1303 {
1304         struct seq_file *m = file->private_data;
1305         struct acpi_thermal *tz = m->private;
1306         int result = 0;
1307         char mode_string[12] = { '\0' };
1308
1309
1310         if (!tz || (count > sizeof(mode_string) - 1))
1311                 return -EINVAL;
1312
1313         if (!tz->flags.cooling_mode)
1314                 return -ENODEV;
1315
1316         if (copy_from_user(mode_string, buffer, count))
1317                 return -EFAULT;
1318
1319         mode_string[count] = '\0';
1320
1321         result = acpi_thermal_set_cooling_mode(tz,
1322                                                simple_strtoul(mode_string, NULL,
1323                                                               0));
1324         if (result)
1325                 return result;
1326
1327         acpi_thermal_check(tz);
1328
1329         return count;
1330 }
1331
1332 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1333 {
1334         struct acpi_thermal *tz = seq->private;
1335
1336
1337         if (!tz)
1338                 goto end;
1339
1340         if (!tz->polling_frequency) {
1341                 seq_puts(seq, "<polling disabled>\n");
1342                 goto end;
1343         }
1344
1345         seq_printf(seq, "polling frequency:       %lu seconds\n",
1346                    (tz->polling_frequency / 10));
1347
1348       end:
1349         return 0;
1350 }
1351
1352 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1353 {
1354         return single_open(file, acpi_thermal_polling_seq_show,
1355                            PDE(inode)->data);
1356 }
1357
1358 static ssize_t
1359 acpi_thermal_write_polling(struct file *file,
1360                            const char __user * buffer,
1361                            size_t count, loff_t * ppos)
1362 {
1363         struct seq_file *m = file->private_data;
1364         struct acpi_thermal *tz = m->private;
1365         int result = 0;
1366         char polling_string[12] = { '\0' };
1367         int seconds = 0;
1368
1369
1370         if (!tz || (count > sizeof(polling_string) - 1))
1371                 return -EINVAL;
1372
1373         if (copy_from_user(polling_string, buffer, count))
1374                 return -EFAULT;
1375
1376         polling_string[count] = '\0';
1377
1378         seconds = simple_strtoul(polling_string, NULL, 0);
1379
1380         result = acpi_thermal_set_polling(tz, seconds);
1381         if (result)
1382                 return result;
1383
1384         acpi_thermal_check(tz);
1385
1386         return count;
1387 }
1388
1389 static int acpi_thermal_add_fs(struct acpi_device *device)
1390 {
1391         struct proc_dir_entry *entry = NULL;
1392
1393
1394         if (!acpi_device_dir(device)) {
1395                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1396                                                      acpi_thermal_dir);
1397                 if (!acpi_device_dir(device))
1398                         return -ENODEV;
1399                 acpi_device_dir(device)->owner = THIS_MODULE;
1400         }
1401
1402         /* 'state' [R] */
1403         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1404                                   S_IRUGO, acpi_device_dir(device));
1405         if (!entry)
1406                 return -ENODEV;
1407         else {
1408                 entry->proc_fops = &acpi_thermal_state_fops;
1409                 entry->data = acpi_driver_data(device);
1410                 entry->owner = THIS_MODULE;
1411         }
1412
1413         /* 'temperature' [R] */
1414         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1415                                   S_IRUGO, acpi_device_dir(device));
1416         if (!entry)
1417                 return -ENODEV;
1418         else {
1419                 entry->proc_fops = &acpi_thermal_temp_fops;
1420                 entry->data = acpi_driver_data(device);
1421                 entry->owner = THIS_MODULE;
1422         }
1423
1424         /* 'trip_points' [R] */
1425         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1426                                   S_IRUGO,
1427                                   acpi_device_dir(device));
1428         if (!entry)
1429                 return -ENODEV;
1430         else {
1431                 entry->proc_fops = &acpi_thermal_trip_fops;
1432                 entry->data = acpi_driver_data(device);
1433                 entry->owner = THIS_MODULE;
1434         }
1435
1436         /* 'cooling_mode' [R/W] */
1437         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1438                                   S_IFREG | S_IRUGO | S_IWUSR,
1439                                   acpi_device_dir(device));
1440         if (!entry)
1441                 return -ENODEV;
1442         else {
1443                 entry->proc_fops = &acpi_thermal_cooling_fops;
1444                 entry->data = acpi_driver_data(device);
1445                 entry->owner = THIS_MODULE;
1446         }
1447
1448         /* 'polling_frequency' [R/W] */
1449         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1450                                   S_IFREG | S_IRUGO | S_IWUSR,
1451                                   acpi_device_dir(device));
1452         if (!entry)
1453                 return -ENODEV;
1454         else {
1455                 entry->proc_fops = &acpi_thermal_polling_fops;
1456                 entry->data = acpi_driver_data(device);
1457                 entry->owner = THIS_MODULE;
1458         }
1459
1460         return 0;
1461 }
1462
1463 static int acpi_thermal_remove_fs(struct acpi_device *device)
1464 {
1465
1466         if (acpi_device_dir(device)) {
1467                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1468                                   acpi_device_dir(device));
1469                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1470                                   acpi_device_dir(device));
1471                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1472                                   acpi_device_dir(device));
1473                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1474                                   acpi_device_dir(device));
1475                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1476                                   acpi_device_dir(device));
1477                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1478                 acpi_device_dir(device) = NULL;
1479         }
1480
1481         return 0;
1482 }
1483
1484 /* --------------------------------------------------------------------------
1485                                  Driver Interface
1486    -------------------------------------------------------------------------- */
1487
1488 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1489 {
1490         struct acpi_thermal *tz = data;
1491         struct acpi_device *device = NULL;
1492
1493
1494         if (!tz)
1495                 return;
1496
1497         device = tz->device;
1498
1499         switch (event) {
1500         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1501                 acpi_thermal_check(tz);
1502                 break;
1503         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1504                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1505                 acpi_thermal_check(tz);
1506                 acpi_bus_generate_proc_event(device, event, 0);
1507                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1508                                                   device->dev.bus_id, event, 0);
1509                 break;
1510         case ACPI_THERMAL_NOTIFY_DEVICES:
1511                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1512                 acpi_thermal_check(tz);
1513                 acpi_bus_generate_proc_event(device, event, 0);
1514                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1515                                                   device->dev.bus_id, event, 0);
1516                 break;
1517         default:
1518                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1519                                   "Unsupported event [0x%x]\n", event));
1520                 break;
1521         }
1522
1523         return;
1524 }
1525
1526 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1527 {
1528         int result = 0;
1529
1530
1531         if (!tz)
1532                 return -EINVAL;
1533
1534         /* Get temperature [_TMP] (required) */
1535         result = acpi_thermal_get_temperature(tz);
1536         if (result)
1537                 return result;
1538
1539         /* Get trip points [_CRT, _PSV, etc.] (required) */
1540         result = acpi_thermal_get_trip_points(tz);
1541         if (result)
1542                 return result;
1543
1544         /* Set the cooling mode [_SCP] to active cooling (default) */
1545         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1546         if (!result)
1547                 tz->flags.cooling_mode = 1;
1548
1549         /* Get default polling frequency [_TZP] (optional) */
1550         if (tzp)
1551                 tz->polling_frequency = tzp;
1552         else
1553                 acpi_thermal_get_polling_frequency(tz);
1554
1555         return 0;
1556 }
1557
1558 static int acpi_thermal_add(struct acpi_device *device)
1559 {
1560         int result = 0;
1561         acpi_status status = AE_OK;
1562         struct acpi_thermal *tz = NULL;
1563
1564
1565         if (!device)
1566                 return -EINVAL;
1567
1568         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1569         if (!tz)
1570                 return -ENOMEM;
1571
1572         tz->device = device;
1573         strcpy(tz->name, device->pnp.bus_id);
1574         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1575         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1576         acpi_driver_data(device) = tz;
1577         mutex_init(&tz->lock);
1578
1579
1580         result = acpi_thermal_get_info(tz);
1581         if (result)
1582                 goto free_memory;
1583
1584         result = acpi_thermal_register_thermal_zone(tz);
1585         if (result)
1586                 goto free_memory;
1587
1588         result = acpi_thermal_add_fs(device);
1589         if (result)
1590                 goto unregister_thermal_zone;
1591
1592         init_timer(&tz->timer);
1593
1594         acpi_thermal_check(tz);
1595
1596         status = acpi_install_notify_handler(device->handle,
1597                                              ACPI_DEVICE_NOTIFY,
1598                                              acpi_thermal_notify, tz);
1599         if (ACPI_FAILURE(status)) {
1600                 result = -ENODEV;
1601                 goto remove_fs;
1602         }
1603
1604         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1605                acpi_device_name(device), acpi_device_bid(device),
1606                KELVIN_TO_CELSIUS(tz->temperature));
1607         goto end;
1608
1609 remove_fs:
1610         acpi_thermal_remove_fs(device);
1611 unregister_thermal_zone:
1612         thermal_zone_device_unregister(tz->thermal_zone);
1613 free_memory:
1614         kfree(tz);
1615 end:
1616         return result;
1617 }
1618
1619 static int acpi_thermal_remove(struct acpi_device *device, int type)
1620 {
1621         acpi_status status = AE_OK;
1622         struct acpi_thermal *tz = NULL;
1623
1624
1625         if (!device || !acpi_driver_data(device))
1626                 return -EINVAL;
1627
1628         tz = acpi_driver_data(device);
1629
1630         /* avoid timer adding new defer task */
1631         tz->zombie = 1;
1632         /* wait for running timer (on other CPUs) finish */
1633         del_timer_sync(&(tz->timer));
1634         /* synchronize deferred task */
1635         acpi_os_wait_events_complete(NULL);
1636         /* deferred task may reinsert timer */
1637         del_timer_sync(&(tz->timer));
1638
1639         status = acpi_remove_notify_handler(device->handle,
1640                                             ACPI_DEVICE_NOTIFY,
1641                                             acpi_thermal_notify);
1642
1643         /* Terminate policy */
1644         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1645                 tz->trips.passive.flags.enabled = 0;
1646                 acpi_thermal_passive(tz);
1647         }
1648         if (tz->trips.active[0].flags.valid
1649             && tz->trips.active[0].flags.enabled) {
1650                 tz->trips.active[0].flags.enabled = 0;
1651                 acpi_thermal_active(tz);
1652         }
1653
1654         acpi_thermal_remove_fs(device);
1655         acpi_thermal_unregister_thermal_zone(tz);
1656         mutex_destroy(&tz->lock);
1657         kfree(tz);
1658         return 0;
1659 }
1660
1661 static int acpi_thermal_resume(struct acpi_device *device)
1662 {
1663         struct acpi_thermal *tz = NULL;
1664         int i, j, power_state, result;
1665
1666
1667         if (!device || !acpi_driver_data(device))
1668                 return -EINVAL;
1669
1670         tz = acpi_driver_data(device);
1671
1672         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1673                 if (!(&tz->trips.active[i]))
1674                         break;
1675                 if (!tz->trips.active[i].flags.valid)
1676                         break;
1677                 tz->trips.active[i].flags.enabled = 1;
1678                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1679                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1680                             handles[j], &power_state);
1681                         if (result || (power_state != ACPI_STATE_D0)) {
1682                                 tz->trips.active[i].flags.enabled = 0;
1683                                 break;
1684                         }
1685                 }
1686                 tz->state.active |= tz->trips.active[i].flags.enabled;
1687         }
1688
1689         acpi_thermal_check(tz);
1690
1691         return AE_OK;
1692 }
1693
1694 #ifdef CONFIG_DMI
1695 static int thermal_act(const struct dmi_system_id *d) {
1696
1697         if (act == 0) {
1698                 printk(KERN_NOTICE "ACPI: %s detected: "
1699                         "disabling all active thermal trip points\n", d->ident);
1700                 act = -1;
1701         }
1702         return 0;
1703 }
1704 static int thermal_nocrt(const struct dmi_system_id *d) {
1705
1706         printk(KERN_NOTICE "ACPI: %s detected: "
1707                 "disabling all critical thermal trip point actions.\n", d->ident);
1708         nocrt = 1;
1709         return 0;
1710 }
1711 static int thermal_tzp(const struct dmi_system_id *d) {
1712
1713         if (tzp == 0) {
1714                 printk(KERN_NOTICE "ACPI: %s detected: "
1715                         "enabling thermal zone polling\n", d->ident);
1716                 tzp = 300;      /* 300 dS = 30 Seconds */
1717         }
1718         return 0;
1719 }
1720 static int thermal_psv(const struct dmi_system_id *d) {
1721
1722         if (psv == 0) {
1723                 printk(KERN_NOTICE "ACPI: %s detected: "
1724                         "disabling all passive thermal trip points\n", d->ident);
1725                 psv = -1;
1726         }
1727         return 0;
1728 }
1729
1730 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1731         /*
1732          * Award BIOS on this AOpen makes thermal control almost worthless.
1733          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1734          */
1735         {
1736          .callback = thermal_act,
1737          .ident = "AOpen i915GMm-HFS",
1738          .matches = {
1739                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1740                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1741                 },
1742         },
1743         {
1744          .callback = thermal_psv,
1745          .ident = "AOpen i915GMm-HFS",
1746          .matches = {
1747                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1748                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1749                 },
1750         },
1751         {
1752          .callback = thermal_tzp,
1753          .ident = "AOpen i915GMm-HFS",
1754          .matches = {
1755                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1756                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1757                 },
1758         },
1759         {
1760          .callback = thermal_nocrt,
1761          .ident = "Gigabyte GA-7ZX",
1762          .matches = {
1763                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1764                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1765                 },
1766         },
1767         {}
1768 };
1769 #endif /* CONFIG_DMI */
1770
1771 static int __init acpi_thermal_init(void)
1772 {
1773         int result = 0;
1774
1775         dmi_check_system(thermal_dmi_table);
1776
1777         if (off) {
1778                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1779                 return -ENODEV;
1780         }
1781         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1782         if (!acpi_thermal_dir)
1783                 return -ENODEV;
1784         acpi_thermal_dir->owner = THIS_MODULE;
1785
1786         result = acpi_bus_register_driver(&acpi_thermal_driver);
1787         if (result < 0) {
1788                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1789                 return -ENODEV;
1790         }
1791
1792         return 0;
1793 }
1794
1795 static void __exit acpi_thermal_exit(void)
1796 {
1797
1798         acpi_bus_unregister_driver(&acpi_thermal_driver);
1799
1800         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1801
1802         return;
1803 }
1804
1805 module_init(acpi_thermal_init);
1806 module_exit(acpi_thermal_exit);