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