drivers/acpi/thermal.c

   1 /*
   2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  *
  25  *  This driver fully implements the ACPI thermal policy as described in the
  26  *  ACPI 2.0 Specification.
  27  *
  28  *  TBD: 1. Implement passive cooling hysteresis.
  29  *       2. Enhance passive cooling (CPU) states/limit interface to support
  30  *          concepts of 'multiple limiters', upper/lower limits, etc.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/sched.h>
  40 #include <linux/kmod.h>
  41 #include <linux/seq_file.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_THERMAL_COMPONENT          0x04000000
  48 #define ACPI_THERMAL_CLASS              "thermal_zone"
  49 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
  50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  51 #define ACPI_THERMAL_FILE_STATE         "state"
  52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
  63 #define ACPI_THERMAL_MODE_CRITICAL      0xff
  64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
  65
  66 #define ACPI_THERMAL_MAX_ACTIVE 10
  67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  68
  69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
  70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
  71
  72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  73 ACPI_MODULE_NAME("acpi_thermal")
  74
  75 MODULE_AUTHOR("Paul Diefenbaugh");
  76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
  77 MODULE_LICENSE("GPL");
  78
  79 static int tzp;
  80 module_param(tzp, int, 0);
  81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
  82
  83 static int acpi_thermal_add(struct acpi_device *device);
  84 static int acpi_thermal_remove(struct acpi_device *device, int type);
  85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
  86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
  87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
  88 static ssize_t acpi_thermal_write_trip_points(struct file *,
  89                                               const char __user *, size_t,
  90                                               loff_t *);
  91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
  92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
  93                                                const char __user *, size_t,
  94                                                loff_t *);
  95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
  96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
  97                                           size_t, loff_t *);
  98
  99 static struct acpi_driver acpi_thermal_driver = {
 100         .name = ACPI_THERMAL_DRIVER_NAME,
 101         .class = ACPI_THERMAL_CLASS,
 102         .ids = ACPI_THERMAL_HID,
 103         .ops = {
 104                 .add = acpi_thermal_add,
 105                 .remove = acpi_thermal_remove,
 106                 },
 107 };
 108
 109 struct acpi_thermal_state {
 110         u8 critical:1;
 111         u8 hot:1;
 112         u8 passive:1;
 113         u8 active:1;
 114         u8 reserved:4;
 115         int active_index;
 116 };
 117
 118 struct acpi_thermal_state_flags {
 119         u8 valid:1;
 120         u8 enabled:1;
 121         u8 reserved:6;
 122 };
 123
 124 struct acpi_thermal_critical {
 125         struct acpi_thermal_state_flags flags;
 126         unsigned long temperature;
 127 };
 128
 129 struct acpi_thermal_hot {
 130         struct acpi_thermal_state_flags flags;
 131         unsigned long temperature;
 132 };
 133
 134 struct acpi_thermal_passive {
 135         struct acpi_thermal_state_flags flags;
 136         unsigned long temperature;
 137         unsigned long tc1;
 138         unsigned long tc2;
 139         unsigned long tsp;
 140         struct acpi_handle_list devices;
 141 };
 142
 143 struct acpi_thermal_active {
 144         struct acpi_thermal_state_flags flags;
 145         unsigned long temperature;
 146         struct acpi_handle_list devices;
 147 };
 148
 149 struct acpi_thermal_trips {
 150         struct acpi_thermal_critical critical;
 151         struct acpi_thermal_hot hot;
 152         struct acpi_thermal_passive passive;
 153         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 154 };
 155
 156 struct acpi_thermal_flags {
 157         u8 cooling_mode:1;      /* _SCP */
 158         u8 devices:1;           /* _TZD */
 159         u8 reserved:6;
 160 };
 161
 162 struct acpi_thermal {
 163         acpi_handle handle;
 164         acpi_bus_id name;
 165         unsigned long temperature;
 166         unsigned long last_temperature;
 167         unsigned long polling_frequency;
 168         u8 cooling_mode;
 169         volatile u8 zombie;
 170         struct acpi_thermal_flags flags;
 171         struct acpi_thermal_state state;
 172         struct acpi_thermal_trips trips;
 173         struct acpi_handle_list devices;
 174         struct timer_list timer;
 175 };
 176
 177 static struct file_operations acpi_thermal_state_fops = {
 178         .open = acpi_thermal_state_open_fs,
 179         .read = seq_read,
 180         .llseek = seq_lseek,
 181         .release = single_release,
 182 };
 183
 184 static struct file_operations acpi_thermal_temp_fops = {
 185         .open = acpi_thermal_temp_open_fs,
 186         .read = seq_read,
 187         .llseek = seq_lseek,
 188         .release = single_release,
 189 };
 190
 191 static struct file_operations acpi_thermal_trip_fops = {
 192         .open = acpi_thermal_trip_open_fs,
 193         .read = seq_read,
 194         .write = acpi_thermal_write_trip_points,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static struct file_operations acpi_thermal_cooling_fops = {
 200         .open = acpi_thermal_cooling_open_fs,
 201         .read = seq_read,
 202         .write = acpi_thermal_write_cooling_mode,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static struct file_operations acpi_thermal_polling_fops = {
 208         .open = acpi_thermal_polling_open_fs,
 209         .read = seq_read,
 210         .write = acpi_thermal_write_polling,
 211         .llseek = seq_lseek,
 212         .release = single_release,
 213 };
 214
 215 /* --------------------------------------------------------------------------
 216                              Thermal Zone Management
 217    -------------------------------------------------------------------------- */
 218
 219 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 220 {
 221         acpi_status status = AE_OK;
 222
 223         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
 224
 225         if (!tz)
 226                 return_VALUE(-EINVAL);
 227
 228         tz->last_temperature = tz->temperature;
 229
 230         status =
 231             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
 232         if (ACPI_FAILURE(status))
 233                 return_VALUE(-ENODEV);
 234
 235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 236                           tz->temperature));
 237
 238         return_VALUE(0);
 239 }
 240
 241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 242 {
 243         acpi_status status = AE_OK;
 244
 245         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
 246
 247         if (!tz)
 248                 return_VALUE(-EINVAL);
 249
 250         status =
 251             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
 252                                   &tz->polling_frequency);
 253         if (ACPI_FAILURE(status))
 254                 return_VALUE(-ENODEV);
 255
 256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 257                           tz->polling_frequency));
 258
 259         return_VALUE(0);
 260 }
 261
 262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 263 {
 264         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
 265
 266         if (!tz)
 267                 return_VALUE(-EINVAL);
 268
 269         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 272                           "Polling frequency set to %lu seconds\n",
 273                           tz->polling_frequency));
 274
 275         return_VALUE(0);
 276 }
 277
 278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 279 {
 280         acpi_status status = AE_OK;
 281         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 282         struct acpi_object_list arg_list = { 1, &arg0 };
 283         acpi_handle handle = NULL;
 284
 285         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
 286
 287         if (!tz)
 288                 return_VALUE(-EINVAL);
 289
 290         status = acpi_get_handle(tz->handle, "_SCP", &handle);
 291         if (ACPI_FAILURE(status)) {
 292                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 293                 return_VALUE(-ENODEV);
 294         }
 295
 296         arg0.integer.value = mode;
 297
 298         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 299         if (ACPI_FAILURE(status))
 300                 return_VALUE(-ENODEV);
 301
 302         tz->cooling_mode = mode;
 303
 304         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
 305                           mode ? "passive" : "active"));
 306
 307         return_VALUE(0);
 308 }
 309
 310 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 311 {
 312         acpi_status status = AE_OK;
 313         int i = 0;
 314
 315         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
 316
 317         if (!tz)
 318                 return_VALUE(-EINVAL);
 319
 320         /* Critical Shutdown (required) */
 321
 322         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
 323                                        &tz->trips.critical.temperature);
 324         if (ACPI_FAILURE(status)) {
 325                 tz->trips.critical.flags.valid = 0;
 326                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
 327                 return_VALUE(-ENODEV);
 328         } else {
 329                 tz->trips.critical.flags.valid = 1;
 330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 331                                   "Found critical threshold [%lu]\n",
 332                                   tz->trips.critical.temperature));
 333         }
 334
 335         /* Critical Sleep (optional) */
 336
 337         status =
 338             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
 339                                   &tz->trips.hot.temperature);
 340         if (ACPI_FAILURE(status)) {
 341                 tz->trips.hot.flags.valid = 0;
 342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
 343         } else {
 344                 tz->trips.hot.flags.valid = 1;
 345                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
 346                                   tz->trips.hot.temperature));
 347         }
 348
 349         /* Passive: Processors (optional) */
 350
 351         status =
 352             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
 353                                   &tz->trips.passive.temperature);
 354         if (ACPI_FAILURE(status)) {
 355                 tz->trips.passive.flags.valid = 0;
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
 357         } else {
 358                 tz->trips.passive.flags.valid = 1;
 359
 360                 status =
 361                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
 362                                           &tz->trips.passive.tc1);
 363                 if (ACPI_FAILURE(status))
 364                         tz->trips.passive.flags.valid = 0;
 365
 366                 status =
 367                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
 368                                           &tz->trips.passive.tc2);
 369                 if (ACPI_FAILURE(status))
 370                         tz->trips.passive.flags.valid = 0;
 371
 372                 status =
 373                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
 374                                           &tz->trips.passive.tsp);
 375                 if (ACPI_FAILURE(status))
 376                         tz->trips.passive.flags.valid = 0;
 377
 378                 status =
 379                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
 380                                             &tz->trips.passive.devices);
 381                 if (ACPI_FAILURE(status))
 382                         tz->trips.passive.flags.valid = 0;
 383
 384                 if (!tz->trips.passive.flags.valid)
 385                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 386                                           "Invalid passive threshold\n"));
 387                 else
 388                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 389                                           "Found passive threshold [%lu]\n",
 390                                           tz->trips.passive.temperature));
 391         }
 392
 393         /* Active: Fans, etc. (optional) */
 394
 395         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 396
 397                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 398
 399                 status =
 400                     acpi_evaluate_integer(tz->handle, name, NULL,
 401                                           &tz->trips.active[i].temperature);
 402                 if (ACPI_FAILURE(status))
 403                         break;
 404
 405                 name[2] = 'L';
 406                 status =
 407                     acpi_evaluate_reference(tz->handle, name, NULL,
 408                                             &tz->trips.active[i].devices);
 409                 if (ACPI_SUCCESS(status)) {
 410                         tz->trips.active[i].flags.valid = 1;
 411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 412                                           "Found active threshold [%d]:[%lu]\n",
 413                                           i, tz->trips.active[i].temperature));
 414                 } else
 415                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 416                                           "Invalid active threshold [%d]\n",
 417                                           i));
 418         }
 419
 420         return_VALUE(0);
 421 }
 422
 423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 424 {
 425         acpi_status status = AE_OK;
 426
 427         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
 428
 429         if (!tz)
 430                 return_VALUE(-EINVAL);
 431
 432         status =
 433             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
 434         if (ACPI_FAILURE(status))
 435                 return_VALUE(-ENODEV);
 436
 437         return_VALUE(0);
 438 }
 439
 440 static int acpi_thermal_call_usermode(char *path)
 441 {
 442         char *argv[2] = { NULL, NULL };
 443         char *envp[3] = { NULL, NULL, NULL };
 444
 445         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
 446
 447         if (!path)
 448                 return_VALUE(-EINVAL);
 449
 450         argv[0] = path;
 451
 452         /* minimal command environment */
 453         envp[0] = "HOME=/";
 454         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 455
 456         call_usermodehelper(argv[0], argv, envp, 0);
 457
 458         return_VALUE(0);
 459 }
 460
 461 static int acpi_thermal_critical(struct acpi_thermal *tz)
 462 {
 463         int result = 0;
 464         struct acpi_device *device = NULL;
 465
 466         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
 467
 468         if (!tz || !tz->trips.critical.flags.valid)
 469                 return_VALUE(-EINVAL);
 470
 471         if (tz->temperature >= tz->trips.critical.temperature) {
 472                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
 473                 tz->trips.critical.flags.enabled = 1;
 474         } else if (tz->trips.critical.flags.enabled)
 475                 tz->trips.critical.flags.enabled = 0;
 476
 477         result = acpi_bus_get_device(tz->handle, &device);
 478         if (result)
 479                 return_VALUE(result);
 480
 481         printk(KERN_EMERG
 482                "Critical temperature reached (%ld C), shutting down.\n",
 483                KELVIN_TO_CELSIUS(tz->temperature));
 484         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
 485                                 tz->trips.critical.flags.enabled);
 486
 487         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
 488
 489         return_VALUE(0);
 490 }
 491
 492 static int acpi_thermal_hot(struct acpi_thermal *tz)
 493 {
 494         int result = 0;
 495         struct acpi_device *device = NULL;
 496
 497         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
 498
 499         if (!tz || !tz->trips.hot.flags.valid)
 500                 return_VALUE(-EINVAL);
 501
 502         if (tz->temperature >= tz->trips.hot.temperature) {
 503                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
 504                 tz->trips.hot.flags.enabled = 1;
 505         } else if (tz->trips.hot.flags.enabled)
 506                 tz->trips.hot.flags.enabled = 0;
 507
 508         result = acpi_bus_get_device(tz->handle, &device);
 509         if (result)
 510                 return_VALUE(result);
 511
 512         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
 513                                 tz->trips.hot.flags.enabled);
 514
 515         /* TBD: Call user-mode "sleep(S4)" function */
 516
 517         return_VALUE(0);
 518 }
 519
 520 static void acpi_thermal_passive(struct acpi_thermal *tz)
 521 {
 522         int result = 1;
 523         struct acpi_thermal_passive *passive = NULL;
 524         int trend = 0;
 525         int i = 0;
 526
 527         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 528
 529         if (!tz || !tz->trips.passive.flags.valid)
 530                 return;
 531
 532         passive = &(tz->trips.passive);
 533
 534         /*
 535          * Above Trip?
 536          * -----------
 537          * Calculate the thermal trend (using the passive cooling equation)
 538          * and modify the performance limit for all passive cooling devices
 539          * accordingly.  Note that we assume symmetry.
 540          */
 541         if (tz->temperature >= passive->temperature) {
 542                 trend =
 543                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
 544                     (passive->tc2 * (tz->temperature - passive->temperature));
 545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 546                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
 547                                   trend, passive->tc1, tz->temperature,
 548                                   tz->last_temperature, passive->tc2,
 549                                   tz->temperature, passive->temperature));
 550                 passive->flags.enabled = 1;
 551                 /* Heating up? */
 552                 if (trend > 0)
 553                         for (i = 0; i < passive->devices.count; i++)
 554                                 acpi_processor_set_thermal_limit(passive->
 555                                                                  devices.
 556                                                                  handles[i],
 557                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
 558                 /* Cooling off? */
 559                 else if (trend < 0) {
 560                         for (i = 0; i < passive->devices.count; i++)
 561                                 /*
 562                                  * assume that we are on highest
 563                                  * freq/lowest thrott and can leave
 564                                  * passive mode, even in error case
 565                                  */
 566                                 if (!acpi_processor_set_thermal_limit
 567                                     (passive->devices.handles[i],
 568                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 569                                         result = 0;
 570                         /*
 571                          * Leave cooling mode, even if the temp might
 572                          * higher than trip point This is because some
 573                          * machines might have long thermal polling
 574                          * frequencies (tsp) defined. We will fall back
 575                          * into passive mode in next cycle (probably quicker)
 576                          */
 577                         if (result) {
 578                                 passive->flags.enabled = 0;
 579                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 580                                                   "Disabling passive cooling, still above threshold,"
 581                                                   " but we are cooling down\n"));
 582                         }
 583                 }
 584                 return;
 585         }
 586
 587         /*
 588          * Below Trip?
 589          * -----------
 590          * Implement passive cooling hysteresis to slowly increase performance
 591          * and avoid thrashing around the passive trip point.  Note that we
 592          * assume symmetry.
 593          */
 594         if (!passive->flags.enabled)
 595                 return;
 596         for (i = 0; i < passive->devices.count; i++)
 597                 if (!acpi_processor_set_thermal_limit
 598                     (passive->devices.handles[i],
 599                      ACPI_PROCESSOR_LIMIT_DECREMENT))
 600                         result = 0;
 601         if (result) {
 602                 passive->flags.enabled = 0;
 603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 604                                   "Disabling passive cooling (zone is cool)\n"));
 605         }
 606 }
 607
 608 static void acpi_thermal_active(struct acpi_thermal *tz)
 609 {
 610         int result = 0;
 611         struct acpi_thermal_active *active = NULL;
 612         int i = 0;
 613         int j = 0;
 614         unsigned long maxtemp = 0;
 615
 616         ACPI_FUNCTION_TRACE("acpi_thermal_active");
 617
 618         if (!tz)
 619                 return;
 620
 621         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 622                 active = &(tz->trips.active[i]);
 623                 if (!active || !active->flags.valid)
 624                         break;
 625                 if (tz->temperature >= active->temperature) {
 626                         /*
 627                          * Above Threshold?
 628                          * ----------------
 629                          * If not already enabled, turn ON all cooling devices
 630                          * associated with this active threshold.
 631                          */
 632                         if (active->temperature > maxtemp)
 633                                 tz->state.active_index = i;
 634                         maxtemp = active->temperature;
 635                         if (active->flags.enabled)
 636                                 continue;
 637                         for (j = 0; j < active->devices.count; j++) {
 638                                 result =
 639                                     acpi_bus_set_power(active->devices.
 640                                                        handles[j],
 641                                                        ACPI_STATE_D0);
 642                                 if (result) {
 643                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 644                                                           "Unable to turn cooling device [%p] 'on'\n",
 645                                                           active->devices.
 646                                                           handles[j]));
 647                                         continue;
 648                                 }
 649                                 active->flags.enabled = 1;
 650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 651                                                   "Cooling device [%p] now 'on'\n",
 652                                                   active->devices.handles[j]));
 653                         }
 654                         continue;
 655                 }
 656                 if (!active->flags.enabled)
 657                         continue;
 658                 /*
 659                  * Below Threshold?
 660                  * ----------------
 661                  * Turn OFF all cooling devices associated with this
 662                  * threshold.
 663                  */
 664                 for (j = 0; j < active->devices.count; j++) {
 665                         result = acpi_bus_set_power(active->devices.handles[j],
 666                                                     ACPI_STATE_D3);
 667                         if (result) {
 668                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 669                                                   "Unable to turn cooling device [%p] 'off'\n",
 670                                                   active->devices.handles[j]));
 671                                 continue;
 672                         }
 673                         active->flags.enabled = 0;
 674                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 675                                           "Cooling device [%p] now 'off'\n",
 676                                           active->devices.handles[j]));
 677                 }
 678         }
 679 }
 680
 681 static void acpi_thermal_check(void *context);
 682
 683 static void acpi_thermal_run(unsigned long data)
 684 {
 685         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 686         if (!tz->zombie)
 687                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
 688 }
 689
 690 static void acpi_thermal_check(void *data)
 691 {
 692         int result = 0;
 693         struct acpi_thermal *tz = (struct acpi_thermal *)data;
 694         unsigned long sleep_time = 0;
 695         int i = 0;
 696         struct acpi_thermal_state state;
 697
 698         ACPI_FUNCTION_TRACE("acpi_thermal_check");
 699
 700         if (!tz) {
 701                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
 702                 return_VOID;
 703         }
 704
 705         state = tz->state;
 706
 707         result = acpi_thermal_get_temperature(tz);
 708         if (result)
 709                 return_VOID;
 710
 711         memset(&tz->state, 0, sizeof(tz->state));
 712
 713         /*
 714          * Check Trip Points
 715          * -----------------
 716          * Compare the current temperature to the trip point values to see
 717          * if we've entered one of the thermal policy states.  Note that
 718          * this function determines when a state is entered, but the
 719          * individual policy decides when it is exited (e.g. hysteresis).
 720          */
 721         if (tz->trips.critical.flags.valid)
 722                 state.critical |=
 723                     (tz->temperature >= tz->trips.critical.temperature);
 724         if (tz->trips.hot.flags.valid)
 725                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
 726         if (tz->trips.passive.flags.valid)
 727                 state.passive |=
 728                     (tz->temperature >= tz->trips.passive.temperature);
 729         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 730                 if (tz->trips.active[i].flags.valid)
 731                         state.active |=
 732                             (tz->temperature >=
 733                              tz->trips.active[i].temperature);
 734
 735         /*
 736          * Invoke Policy
 737          * -------------
 738          * Separated from the above check to allow individual policy to
 739          * determine when to exit a given state.
 740          */
 741         if (state.critical)
 742                 acpi_thermal_critical(tz);
 743         if (state.hot)
 744                 acpi_thermal_hot(tz);
 745         if (state.passive)
 746                 acpi_thermal_passive(tz);
 747         if (state.active)
 748                 acpi_thermal_active(tz);
 749
 750         /*
 751          * Calculate State
 752          * ---------------
 753          * Again, separated from the above two to allow independent policy
 754          * decisions.
 755          */
 756         tz->state.critical = tz->trips.critical.flags.enabled;
 757         tz->state.hot = tz->trips.hot.flags.enabled;
 758         tz->state.passive = tz->trips.passive.flags.enabled;
 759         tz->state.active = 0;
 760         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
 761                 tz->state.active |= tz->trips.active[i].flags.enabled;
 762
 763         /*
 764          * Calculate Sleep Time
 765          * --------------------
 766          * If we're in the passive state, use _TSP's value.  Otherwise
 767          * use the default polling frequency (e.g. _TZP).  If no polling
 768          * frequency is specified then we'll wait forever (at least until
 769          * a thermal event occurs).  Note that _TSP and _TZD values are
 770          * given in 1/10th seconds (we must covert to milliseconds).
 771          */
 772         if (tz->state.passive)
 773                 sleep_time = tz->trips.passive.tsp * 100;
 774         else if (tz->polling_frequency > 0)
 775                 sleep_time = tz->polling_frequency * 100;
 776
 777         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
 778                           tz->name, tz->temperature, sleep_time));
 779
 780         /*
 781          * Schedule Next Poll
 782          * ------------------
 783          */
 784         if (!sleep_time) {
 785                 if (timer_pending(&(tz->timer)))
 786                         del_timer(&(tz->timer));
 787         } else {
 788                 if (timer_pending(&(tz->timer)))
 789                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
 790                 else {
 791                         tz->timer.data = (unsigned long)tz;
 792                         tz->timer.function = acpi_thermal_run;
 793                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
 794                         add_timer(&(tz->timer));
 795                 }
 796         }
 797
 798         return_VOID;
 799 }
 800
 801 /* --------------------------------------------------------------------------
 802                               FS Interface (/proc)
 803    -------------------------------------------------------------------------- */
 804
 805 static struct proc_dir_entry *acpi_thermal_dir;
 806
 807 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 808 {
 809         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 810
 811         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
 812
 813         if (!tz)
 814                 goto end;
 815
 816         seq_puts(seq, "state:                   ");
 817
 818         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 819             && !tz->state.active)
 820                 seq_puts(seq, "ok\n");
 821         else {
 822                 if (tz->state.critical)
 823                         seq_puts(seq, "critical ");
 824                 if (tz->state.hot)
 825                         seq_puts(seq, "hot ");
 826                 if (tz->state.passive)
 827                         seq_puts(seq, "passive ");
 828                 if (tz->state.active)
 829                         seq_printf(seq, "active[%d]", tz->state.active_index);
 830                 seq_puts(seq, "\n");
 831         }
 832
 833       end:
 834         return_VALUE(0);
 835 }
 836
 837 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 838 {
 839         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 840 }
 841
 842 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 843 {
 844         int result = 0;
 845         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 846
 847         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
 848
 849         if (!tz)
 850                 goto end;
 851
 852         result = acpi_thermal_get_temperature(tz);
 853         if (result)
 854                 goto end;
 855
 856         seq_printf(seq, "temperature:             %ld C\n",
 857                    KELVIN_TO_CELSIUS(tz->temperature));
 858
 859       end:
 860         return_VALUE(0);
 861 }
 862
 863 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
 864 {
 865         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
 866 }
 867
 868 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
 869 {
 870         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 871         int i = 0;
 872         int j = 0;
 873
 874         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
 875
 876         if (!tz)
 877                 goto end;
 878
 879         if (tz->trips.critical.flags.valid)
 880                 seq_printf(seq, "critical (S5):           %ld C\n",
 881                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
 882
 883         if (tz->trips.hot.flags.valid)
 884                 seq_printf(seq, "hot (S4):                %ld C\n",
 885                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
 886
 887         if (tz->trips.passive.flags.valid) {
 888                 seq_printf(seq,
 889                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
 890                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
 891                            tz->trips.passive.tc1, tz->trips.passive.tc2,
 892                            tz->trips.passive.tsp);
 893                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
 894
 895                         seq_printf(seq, "0x%p ",
 896                                    tz->trips.passive.devices.handles[j]);
 897                 }
 898                 seq_puts(seq, "\n");
 899         }
 900
 901         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 902                 if (!(tz->trips.active[i].flags.valid))
 903                         break;
 904                 seq_printf(seq, "active[%d]:               %ld C: devices=",
 905                            i,
 906                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
 907                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
 908                         seq_printf(seq, "0x%p ",
 909                                    tz->trips.active[i].devices.handles[j]);
 910                 seq_puts(seq, "\n");
 911         }
 912
 913       end:
 914         return_VALUE(0);
 915 }
 916
 917 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
 918 {
 919         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
 920 }
 921
 922 static ssize_t
 923 acpi_thermal_write_trip_points(struct file *file,
 924                                const char __user * buffer,
 925                                size_t count, loff_t * ppos)
 926 {
 927         struct seq_file *m = (struct seq_file *)file->private_data;
 928         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
 929
 930         char *limit_string;
 931         int num, critical, hot, passive;
 932         int *active;
 933         int i = 0;
 934
 935         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
 936
 937         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
 938         if (!limit_string)
 939                 return_VALUE(-ENOMEM);
 940
 941         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
 942
 943         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
 944         if (!active)
 945                 return_VALUE(-ENOMEM);
 946
 947         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
 948                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
 949                 count = -EINVAL;
 950                 goto end;
 951         }
 952
 953         if (copy_from_user(limit_string, buffer, count)) {
 954                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
 955                 count = -EFAULT;
 956                 goto end;
 957         }
 958
 959         limit_string[count] = '\0';
 960
 961         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
 962                      &critical, &hot, &passive,
 963                      &active[0], &active[1], &active[2], &active[3], &active[4],
 964                      &active[5], &active[6], &active[7], &active[8],
 965                      &active[9]);
 966         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
 967                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
 968                 count = -EINVAL;
 969                 goto end;
 970         }
 971
 972         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
 973         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
 974         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
 975         for (i = 0; i < num - 3; i++) {
 976                 if (!(tz->trips.active[i].flags.valid))
 977                         break;
 978                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
 979         }
 980
 981       end:
 982         kfree(active);
 983         kfree(limit_string);
 984         return_VALUE(count);
 985 }
 986
 987 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
 988 {
 989         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
 990
 991         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
 992
 993         if (!tz)
 994                 goto end;
 995
 996         if (!tz->flags.cooling_mode) {
 997                 seq_puts(seq, "<setting not supported>\n");
 998         }
 999
1000         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1001                 seq_printf(seq, "cooling mode:  critical\n");
1002         else
1003                 seq_printf(seq, "cooling mode:  %s\n",
1004                            tz->cooling_mode ? "passive" : "active");
1005
1006       end:
1007         return_VALUE(0);
1008 }
1009
1010 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1011 {
1012         return single_open(file, acpi_thermal_cooling_seq_show,
1013                            PDE(inode)->data);
1014 }
1015
1016 static ssize_t
1017 acpi_thermal_write_cooling_mode(struct file *file,
1018                                 const char __user * buffer,
1019                                 size_t count, loff_t * ppos)
1020 {
1021         struct seq_file *m = (struct seq_file *)file->private_data;
1022         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1023         int result = 0;
1024         char mode_string[12] = { '\0' };
1025
1026         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1027
1028         if (!tz || (count > sizeof(mode_string) - 1))
1029                 return_VALUE(-EINVAL);
1030
1031         if (!tz->flags.cooling_mode)
1032                 return_VALUE(-ENODEV);
1033
1034         if (copy_from_user(mode_string, buffer, count))
1035                 return_VALUE(-EFAULT);
1036
1037         mode_string[count] = '\0';
1038
1039         result = acpi_thermal_set_cooling_mode(tz,
1040                                                simple_strtoul(mode_string, NULL,
1041                                                               0));
1042         if (result)
1043                 return_VALUE(result);
1044
1045         acpi_thermal_check(tz);
1046
1047         return_VALUE(count);
1048 }
1049
1050 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1051 {
1052         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1053
1054         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1055
1056         if (!tz)
1057                 goto end;
1058
1059         if (!tz->polling_frequency) {
1060                 seq_puts(seq, "<polling disabled>\n");
1061                 goto end;
1062         }
1063
1064         seq_printf(seq, "polling frequency:       %lu seconds\n",
1065                    (tz->polling_frequency / 10));
1066
1067       end:
1068         return_VALUE(0);
1069 }
1070
1071 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1072 {
1073         return single_open(file, acpi_thermal_polling_seq_show,
1074                            PDE(inode)->data);
1075 }
1076
1077 static ssize_t
1078 acpi_thermal_write_polling(struct file *file,
1079                            const char __user * buffer,
1080                            size_t count, loff_t * ppos)
1081 {
1082         struct seq_file *m = (struct seq_file *)file->private_data;
1083         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1084         int result = 0;
1085         char polling_string[12] = { '\0' };
1086         int seconds = 0;
1087
1088         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1089
1090         if (!tz || (count > sizeof(polling_string) - 1))
1091                 return_VALUE(-EINVAL);
1092
1093         if (copy_from_user(polling_string, buffer, count))
1094                 return_VALUE(-EFAULT);
1095
1096         polling_string[count] = '\0';
1097
1098         seconds = simple_strtoul(polling_string, NULL, 0);
1099
1100         result = acpi_thermal_set_polling(tz, seconds);
1101         if (result)
1102                 return_VALUE(result);
1103
1104         acpi_thermal_check(tz);
1105
1106         return_VALUE(count);
1107 }
1108
1109 static int acpi_thermal_add_fs(struct acpi_device *device)
1110 {
1111         struct proc_dir_entry *entry = NULL;
1112
1113         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1114
1115         if (!acpi_device_dir(device)) {
1116                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1117                                                      acpi_thermal_dir);
1118                 if (!acpi_device_dir(device))
1119                         return_VALUE(-ENODEV);
1120                 acpi_device_dir(device)->owner = THIS_MODULE;
1121         }
1122
1123         /* 'state' [R] */
1124         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1125                                   S_IRUGO, acpi_device_dir(device));
1126         if (!entry)
1127                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1128                                   "Unable to create '%s' fs entry\n",
1129                                   ACPI_THERMAL_FILE_STATE));
1130         else {
1131                 entry->proc_fops = &acpi_thermal_state_fops;
1132                 entry->data = acpi_driver_data(device);
1133                 entry->owner = THIS_MODULE;
1134         }
1135
1136         /* 'temperature' [R] */
1137         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1138                                   S_IRUGO, acpi_device_dir(device));
1139         if (!entry)
1140                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1141                                   "Unable to create '%s' fs entry\n",
1142                                   ACPI_THERMAL_FILE_TEMPERATURE));
1143         else {
1144                 entry->proc_fops = &acpi_thermal_temp_fops;
1145                 entry->data = acpi_driver_data(device);
1146                 entry->owner = THIS_MODULE;
1147         }
1148
1149         /* 'trip_points' [R/W] */
1150         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1151                                   S_IFREG | S_IRUGO | S_IWUSR,
1152                                   acpi_device_dir(device));
1153         if (!entry)
1154                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1155                                   "Unable to create '%s' fs entry\n",
1156                                   ACPI_THERMAL_FILE_TRIP_POINTS));
1157         else {
1158                 entry->proc_fops = &acpi_thermal_trip_fops;
1159                 entry->data = acpi_driver_data(device);
1160                 entry->owner = THIS_MODULE;
1161         }
1162
1163         /* 'cooling_mode' [R/W] */
1164         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1165                                   S_IFREG | S_IRUGO | S_IWUSR,
1166                                   acpi_device_dir(device));
1167         if (!entry)
1168                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1169                                   "Unable to create '%s' fs entry\n",
1170                                   ACPI_THERMAL_FILE_COOLING_MODE));
1171         else {
1172                 entry->proc_fops = &acpi_thermal_cooling_fops;
1173                 entry->data = acpi_driver_data(device);
1174                 entry->owner = THIS_MODULE;
1175         }
1176
1177         /* 'polling_frequency' [R/W] */
1178         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1179                                   S_IFREG | S_IRUGO | S_IWUSR,
1180                                   acpi_device_dir(device));
1181         if (!entry)
1182                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1183                                   "Unable to create '%s' fs entry\n",
1184                                   ACPI_THERMAL_FILE_POLLING_FREQ));
1185         else {
1186                 entry->proc_fops = &acpi_thermal_polling_fops;
1187                 entry->data = acpi_driver_data(device);
1188                 entry->owner = THIS_MODULE;
1189         }
1190
1191         return_VALUE(0);
1192 }
1193
1194 static int acpi_thermal_remove_fs(struct acpi_device *device)
1195 {
1196         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1197
1198         if (acpi_device_dir(device)) {
1199                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1200                                   acpi_device_dir(device));
1201                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1202                                   acpi_device_dir(device));
1203                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1204                                   acpi_device_dir(device));
1205                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1206                                   acpi_device_dir(device));
1207                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1208                                   acpi_device_dir(device));
1209                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1210                 acpi_device_dir(device) = NULL;
1211         }
1212
1213         return_VALUE(0);
1214 }
1215
1216 /* --------------------------------------------------------------------------
1217                                  Driver Interface
1218    -------------------------------------------------------------------------- */
1219
1220 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1221 {
1222         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1223         struct acpi_device *device = NULL;
1224
1225         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1226
1227         if (!tz)
1228                 return_VOID;
1229
1230         if (acpi_bus_get_device(tz->handle, &device))
1231                 return_VOID;
1232
1233         switch (event) {
1234         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1235                 acpi_thermal_check(tz);
1236                 break;
1237         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1238                 acpi_thermal_get_trip_points(tz);
1239                 acpi_thermal_check(tz);
1240                 acpi_bus_generate_event(device, event, 0);
1241                 break;
1242         case ACPI_THERMAL_NOTIFY_DEVICES:
1243                 if (tz->flags.devices)
1244                         acpi_thermal_get_devices(tz);
1245                 acpi_bus_generate_event(device, event, 0);
1246                 break;
1247         default:
1248                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1249                                   "Unsupported event [0x%x]\n", event));
1250                 break;
1251         }
1252
1253         return_VOID;
1254 }
1255
1256 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1257 {
1258         int result = 0;
1259
1260         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1261
1262         if (!tz)
1263                 return_VALUE(-EINVAL);
1264
1265         /* Get temperature [_TMP] (required) */
1266         result = acpi_thermal_get_temperature(tz);
1267         if (result)
1268                 return_VALUE(result);
1269
1270         /* Get trip points [_CRT, _PSV, etc.] (required) */
1271         result = acpi_thermal_get_trip_points(tz);
1272         if (result)
1273                 return_VALUE(result);
1274
1275         /* Set the cooling mode [_SCP] to active cooling (default) */
1276         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1277         if (!result)
1278                 tz->flags.cooling_mode = 1;
1279         else {
1280                 /* Oh,we have not _SCP method.
1281                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1282                 tz->flags.cooling_mode = 0;
1283                 if (tz->trips.active[0].flags.valid
1284                     && tz->trips.passive.flags.valid) {
1285                         if (tz->trips.passive.temperature >
1286                             tz->trips.active[0].temperature)
1287                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1288                         else
1289                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1290                 } else if (!tz->trips.active[0].flags.valid
1291                            && tz->trips.passive.flags.valid) {
1292                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1293                 } else if (tz->trips.active[0].flags.valid
1294                            && !tz->trips.passive.flags.valid) {
1295                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1296                 } else {
1297                         /* _ACx and _PSV are optional, but _CRT is required */
1298                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1299                 }
1300         }
1301
1302         /* Get default polling frequency [_TZP] (optional) */
1303         if (tzp)
1304                 tz->polling_frequency = tzp;
1305         else
1306                 acpi_thermal_get_polling_frequency(tz);
1307
1308         /* Get devices in this thermal zone [_TZD] (optional) */
1309         result = acpi_thermal_get_devices(tz);
1310         if (!result)
1311                 tz->flags.devices = 1;
1312
1313         return_VALUE(0);
1314 }
1315
1316 static int acpi_thermal_add(struct acpi_device *device)
1317 {
1318         int result = 0;
1319         acpi_status status = AE_OK;
1320         struct acpi_thermal *tz = NULL;
1321
1322         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1323
1324         if (!device)
1325                 return_VALUE(-EINVAL);
1326
1327         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1328         if (!tz)
1329                 return_VALUE(-ENOMEM);
1330         memset(tz, 0, sizeof(struct acpi_thermal));
1331
1332         tz->handle = device->handle;
1333         strcpy(tz->name, device->pnp.bus_id);
1334         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1335         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1336         acpi_driver_data(device) = tz;
1337
1338         result = acpi_thermal_get_info(tz);
1339         if (result)
1340                 goto end;
1341
1342         result = acpi_thermal_add_fs(device);
1343         if (result)
1344                 return_VALUE(result);
1345
1346         init_timer(&tz->timer);
1347
1348         acpi_thermal_check(tz);
1349
1350         status = acpi_install_notify_handler(tz->handle,
1351                                              ACPI_DEVICE_NOTIFY,
1352                                              acpi_thermal_notify, tz);
1353         if (ACPI_FAILURE(status)) {
1354                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1355                                   "Error installing notify handler\n"));
1356                 result = -ENODEV;
1357                 goto end;
1358         }
1359
1360         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1361                acpi_device_name(device), acpi_device_bid(device),
1362                KELVIN_TO_CELSIUS(tz->temperature));
1363
1364       end:
1365         if (result) {
1366                 acpi_thermal_remove_fs(device);
1367                 kfree(tz);
1368         }
1369
1370         return_VALUE(result);
1371 }
1372
1373 static int acpi_thermal_remove(struct acpi_device *device, int type)
1374 {
1375         acpi_status status = AE_OK;
1376         struct acpi_thermal *tz = NULL;
1377
1378         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1379
1380         if (!device || !acpi_driver_data(device))
1381                 return_VALUE(-EINVAL);
1382
1383         tz = (struct acpi_thermal *)acpi_driver_data(device);
1384
1385         /* avoid timer adding new defer task */
1386         tz->zombie = 1;
1387         /* wait for running timer (on other CPUs) finish */
1388         del_timer_sync(&(tz->timer));
1389         /* synchronize deferred task */
1390         acpi_os_wait_events_complete(NULL);
1391         /* deferred task may reinsert timer */
1392         del_timer_sync(&(tz->timer));
1393
1394         status = acpi_remove_notify_handler(tz->handle,
1395                                             ACPI_DEVICE_NOTIFY,
1396                                             acpi_thermal_notify);
1397         if (ACPI_FAILURE(status))
1398                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1399                                   "Error removing notify handler\n"));
1400
1401         /* Terminate policy */
1402         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1403                 tz->trips.passive.flags.enabled = 0;
1404                 acpi_thermal_passive(tz);
1405         }
1406         if (tz->trips.active[0].flags.valid
1407             && tz->trips.active[0].flags.enabled) {
1408                 tz->trips.active[0].flags.enabled = 0;
1409                 acpi_thermal_active(tz);
1410         }
1411
1412         acpi_thermal_remove_fs(device);
1413
1414         kfree(tz);
1415         return_VALUE(0);
1416 }
1417
1418 static int __init acpi_thermal_init(void)
1419 {
1420         int result = 0;
1421
1422         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1423
1424         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1425         if (!acpi_thermal_dir)
1426                 return_VALUE(-ENODEV);
1427         acpi_thermal_dir->owner = THIS_MODULE;
1428
1429         result = acpi_bus_register_driver(&acpi_thermal_driver);
1430         if (result < 0) {
1431                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1432                 return_VALUE(-ENODEV);
1433         }
1434
1435         return_VALUE(0);
1436 }
1437
1438 static void __exit acpi_thermal_exit(void)
1439 {
1440         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1441
1442         acpi_bus_unregister_driver(&acpi_thermal_driver);
1443
1444         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1445
1446         return_VOID;
1447 }
1448
1449 module_init(acpi_thermal_init);
1450 module_exit(acpi_thermal_exit);