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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/jiffies.h>
  41 #include <linux/kmod.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/reboot.h>
  44 #include <linux/device.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/thermal.h>
  47 #include <acpi/acpi_bus.h>
  48 #include <acpi/acpi_drivers.h>
  49
  50 #define ACPI_THERMAL_CLASS              "thermal_zone"
  51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
  52 #define ACPI_THERMAL_FILE_STATE         "state"
  53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
  54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
  55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
  56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
  57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
  58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
  59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
  60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
  61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
  62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
  63
  64 #define ACPI_THERMAL_MAX_ACTIVE 10
  65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
  66
  67 #define _COMPONENT              ACPI_THERMAL_COMPONENT
  68 ACPI_MODULE_NAME("thermal");
  69
  70 MODULE_AUTHOR("Paul Diefenbaugh");
  71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int act;
  75 module_param(act, int, 0644);
  76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
  77
  78 static int crt;
  79 module_param(crt, int, 0644);
  80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
  81
  82 static int tzp;
  83 module_param(tzp, int, 0444);
  84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
  85
  86 static int nocrt;
  87 module_param(nocrt, int, 0);
  88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
  89
  90 static int off;
  91 module_param(off, int, 0);
  92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
  93
  94 static int psv;
  95 module_param(psv, int, 0644);
  96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
  97
  98 static int acpi_thermal_add(struct acpi_device *device);
  99 static int acpi_thermal_remove(struct acpi_device *device, int type);
 100 static int acpi_thermal_resume(struct acpi_device *device);
 101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
 103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
 104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
 105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
 106 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
 107                                                const char __user *, size_t,
 108                                                loff_t *);
 109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
 110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
 111                                           size_t, loff_t *);
 112
 113 static const struct acpi_device_id  thermal_device_ids[] = {
 114         {ACPI_THERMAL_HID, 0},
 115         {"", 0},
 116 };
 117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
 118
 119 static struct acpi_driver acpi_thermal_driver = {
 120         .name = "thermal",
 121         .class = ACPI_THERMAL_CLASS,
 122         .ids = thermal_device_ids,
 123         .ops = {
 124                 .add = acpi_thermal_add,
 125                 .remove = acpi_thermal_remove,
 126                 .resume = acpi_thermal_resume,
 127                 .notify = acpi_thermal_notify,
 128                 },
 129 };
 130
 131 struct acpi_thermal_state {
 132         u8 critical:1;
 133         u8 hot:1;
 134         u8 passive:1;
 135         u8 active:1;
 136         u8 reserved:4;
 137         int active_index;
 138 };
 139
 140 struct acpi_thermal_state_flags {
 141         u8 valid:1;
 142         u8 enabled:1;
 143         u8 reserved:6;
 144 };
 145
 146 struct acpi_thermal_critical {
 147         struct acpi_thermal_state_flags flags;
 148         unsigned long temperature;
 149 };
 150
 151 struct acpi_thermal_hot {
 152         struct acpi_thermal_state_flags flags;
 153         unsigned long temperature;
 154 };
 155
 156 struct acpi_thermal_passive {
 157         struct acpi_thermal_state_flags flags;
 158         unsigned long temperature;
 159         unsigned long tc1;
 160         unsigned long tc2;
 161         unsigned long tsp;
 162         struct acpi_handle_list devices;
 163 };
 164
 165 struct acpi_thermal_active {
 166         struct acpi_thermal_state_flags flags;
 167         unsigned long temperature;
 168         struct acpi_handle_list devices;
 169 };
 170
 171 struct acpi_thermal_trips {
 172         struct acpi_thermal_critical critical;
 173         struct acpi_thermal_hot hot;
 174         struct acpi_thermal_passive passive;
 175         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
 176 };
 177
 178 struct acpi_thermal_flags {
 179         u8 cooling_mode:1;      /* _SCP */
 180         u8 devices:1;           /* _TZD */
 181         u8 reserved:6;
 182 };
 183
 184 struct acpi_thermal {
 185         struct acpi_device * device;
 186         acpi_bus_id name;
 187         unsigned long temperature;
 188         unsigned long last_temperature;
 189         unsigned long polling_frequency;
 190         volatile u8 zombie;
 191         struct acpi_thermal_flags flags;
 192         struct acpi_thermal_state state;
 193         struct acpi_thermal_trips trips;
 194         struct acpi_handle_list devices;
 195         struct thermal_zone_device *thermal_zone;
 196         int tz_enabled;
 197         int kelvin_offset;
 198         struct mutex lock;
 199 };
 200
 201 static const struct file_operations acpi_thermal_state_fops = {
 202         .owner = THIS_MODULE,
 203         .open = acpi_thermal_state_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static const struct file_operations acpi_thermal_temp_fops = {
 210         .owner = THIS_MODULE,
 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         .owner = THIS_MODULE,
 219         .open = acpi_thermal_trip_open_fs,
 220         .read = seq_read,
 221         .llseek = seq_lseek,
 222         .release = single_release,
 223 };
 224
 225 static const struct file_operations acpi_thermal_cooling_fops = {
 226         .owner = THIS_MODULE,
 227         .open = acpi_thermal_cooling_open_fs,
 228         .read = seq_read,
 229         .write = acpi_thermal_write_cooling_mode,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 static const struct file_operations acpi_thermal_polling_fops = {
 235         .owner = THIS_MODULE,
 236         .open = acpi_thermal_polling_open_fs,
 237         .read = seq_read,
 238         .write = acpi_thermal_write_polling,
 239         .llseek = seq_lseek,
 240         .release = single_release,
 241 };
 242
 243 /* --------------------------------------------------------------------------
 244                              Thermal Zone Management
 245    -------------------------------------------------------------------------- */
 246
 247 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
 248 {
 249         acpi_status status = AE_OK;
 250         unsigned long long tmp;
 251
 252         if (!tz)
 253                 return -EINVAL;
 254
 255         tz->last_temperature = tz->temperature;
 256
 257         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
 258         if (ACPI_FAILURE(status))
 259                 return -ENODEV;
 260
 261         tz->temperature = tmp;
 262         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
 263                           tz->temperature));
 264
 265         return 0;
 266 }
 267
 268 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
 269 {
 270         acpi_status status = AE_OK;
 271         unsigned long long tmp;
 272
 273         if (!tz)
 274                 return -EINVAL;
 275
 276         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
 277         if (ACPI_FAILURE(status))
 278                 return -ENODEV;
 279
 280         tz->polling_frequency = tmp;
 281         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
 282                           tz->polling_frequency));
 283
 284         return 0;
 285 }
 286
 287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
 288 {
 289
 290         if (!tz)
 291                 return -EINVAL;
 292
 293         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
 294
 295         tz->thermal_zone->polling_delay = seconds * 1000;
 296
 297         if (tz->tz_enabled)
 298                 thermal_zone_device_update(tz->thermal_zone);
 299
 300         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 301                           "Polling frequency set to %lu seconds\n",
 302                           tz->polling_frequency/10));
 303
 304         return 0;
 305 }
 306
 307 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
 308 {
 309         acpi_status status = AE_OK;
 310         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 311         struct acpi_object_list arg_list = { 1, &arg0 };
 312         acpi_handle handle = NULL;
 313
 314
 315         if (!tz)
 316                 return -EINVAL;
 317
 318         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
 319         if (ACPI_FAILURE(status)) {
 320                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
 321                 return -ENODEV;
 322         }
 323
 324         arg0.integer.value = mode;
 325
 326         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
 327         if (ACPI_FAILURE(status))
 328                 return -ENODEV;
 329
 330         return 0;
 331 }
 332
 333 #define ACPI_TRIPS_CRITICAL     0x01
 334 #define ACPI_TRIPS_HOT          0x02
 335 #define ACPI_TRIPS_PASSIVE      0x04
 336 #define ACPI_TRIPS_ACTIVE       0x08
 337 #define ACPI_TRIPS_DEVICES      0x10
 338
 339 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
 340 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
 341
 342 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
 343                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
 344                               ACPI_TRIPS_DEVICES)
 345
 346 /*
 347  * This exception is thrown out in two cases:
 348  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
 349  *   when re-evaluating the AML code.
 350  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
 351  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
 352  */
 353 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
 354 do {    \
 355         if (flags != ACPI_TRIPS_INIT)   \
 356                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
 357                 "ACPI thermal trip point %s changed\n"  \
 358                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
 359 } while (0)
 360
 361 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 362 {
 363         acpi_status status = AE_OK;
 364         unsigned long long tmp;
 365         struct acpi_handle_list devices;
 366         int valid = 0;
 367         int i;
 368
 369         /* Critical Shutdown (required) */
 370         if (flag & ACPI_TRIPS_CRITICAL) {
 371                 status = acpi_evaluate_integer(tz->device->handle,
 372                                 "_CRT", NULL, &tmp);
 373                 tz->trips.critical.temperature = tmp;
 374                 /*
 375                  * Treat freezing temperatures as invalid as well; some
 376                  * BIOSes return really low values and cause reboots at startup.
 377                  * Below zero (Celsius) values clearly aren't right for sure..
 378                  * ... so lets discard those as invalid.
 379                  */
 380                 if (ACPI_FAILURE(status) ||
 381                                 tz->trips.critical.temperature <= 2732) {
 382                         tz->trips.critical.flags.valid = 0;
 383                         ACPI_EXCEPTION((AE_INFO, status,
 384                                         "No or invalid critical threshold"));
 385                         return -ENODEV;
 386                 } else {
 387                         tz->trips.critical.flags.valid = 1;
 388                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 389                                         "Found critical threshold [%lu]\n",
 390                                         tz->trips.critical.temperature));
 391                 }
 392                 if (tz->trips.critical.flags.valid == 1) {
 393                         if (crt == -1) {
 394                                 tz->trips.critical.flags.valid = 0;
 395                         } else if (crt > 0) {
 396                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
 397                                 /*
 398                                  * Allow override critical threshold
 399                                  */
 400                                 if (crt_k > tz->trips.critical.temperature)
 401                                         printk(KERN_WARNING PREFIX
 402                                                 "Critical threshold %d C\n", crt);
 403                                 tz->trips.critical.temperature = crt_k;
 404                         }
 405                 }
 406         }
 407
 408         /* Critical Sleep (optional) */
 409         if (flag & ACPI_TRIPS_HOT) {
 410                 status = acpi_evaluate_integer(tz->device->handle,
 411                                 "_HOT", NULL, &tmp);
 412                 if (ACPI_FAILURE(status)) {
 413                         tz->trips.hot.flags.valid = 0;
 414                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 415                                         "No hot threshold\n"));
 416                 } else {
 417                         tz->trips.hot.temperature = tmp;
 418                         tz->trips.hot.flags.valid = 1;
 419                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 420                                         "Found hot threshold [%lu]\n",
 421                                         tz->trips.critical.temperature));
 422                 }
 423         }
 424
 425         /* Passive (optional) */
 426         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
 427                 (flag == ACPI_TRIPS_INIT)) {
 428                 valid = tz->trips.passive.flags.valid;
 429                 if (psv == -1) {
 430                         status = AE_SUPPORT;
 431                 } else if (psv > 0) {
 432                         tmp = CELSIUS_TO_KELVIN(psv);
 433                         status = AE_OK;
 434                 } else {
 435                         status = acpi_evaluate_integer(tz->device->handle,
 436                                 "_PSV", NULL, &tmp);
 437                 }
 438
 439                 if (ACPI_FAILURE(status))
 440                         tz->trips.passive.flags.valid = 0;
 441                 else {
 442                         tz->trips.passive.temperature = tmp;
 443                         tz->trips.passive.flags.valid = 1;
 444                         if (flag == ACPI_TRIPS_INIT) {
 445                                 status = acpi_evaluate_integer(
 446                                                 tz->device->handle, "_TC1",
 447                                                 NULL, &tmp);
 448                                 if (ACPI_FAILURE(status))
 449                                         tz->trips.passive.flags.valid = 0;
 450                                 else
 451                                         tz->trips.passive.tc1 = tmp;
 452                                 status = acpi_evaluate_integer(
 453                                                 tz->device->handle, "_TC2",
 454                                                 NULL, &tmp);
 455                                 if (ACPI_FAILURE(status))
 456                                         tz->trips.passive.flags.valid = 0;
 457                                 else
 458                                         tz->trips.passive.tc2 = tmp;
 459                                 status = acpi_evaluate_integer(
 460                                                 tz->device->handle, "_TSP",
 461                                                 NULL, &tmp);
 462                                 if (ACPI_FAILURE(status))
 463                                         tz->trips.passive.flags.valid = 0;
 464                                 else
 465                                         tz->trips.passive.tsp = tmp;
 466                         }
 467                 }
 468         }
 469         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 470                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 471                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
 472                                                         NULL, &devices);
 473                 if (ACPI_FAILURE(status)) {
 474                         printk(KERN_WARNING PREFIX
 475                                 "Invalid passive threshold\n");
 476                         tz->trips.passive.flags.valid = 0;
 477                 }
 478                 else
 479                         tz->trips.passive.flags.valid = 1;
 480
 481                 if (memcmp(&tz->trips.passive.devices, &devices,
 482                                 sizeof(struct acpi_handle_list))) {
 483                         memcpy(&tz->trips.passive.devices, &devices,
 484                                 sizeof(struct acpi_handle_list));
 485                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 486                 }
 487         }
 488         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 489                 if (valid != tz->trips.passive.flags.valid)
 490                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 491         }
 492
 493         /* Active (optional) */
 494         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 495                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 496                 valid = tz->trips.active[i].flags.valid;
 497
 498                 if (act == -1)
 499                         break; /* disable all active trip points */
 500
 501                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
 502                         tz->trips.active[i].flags.valid)) {
 503                         status = acpi_evaluate_integer(tz->device->handle,
 504                                                         name, NULL, &tmp);
 505                         if (ACPI_FAILURE(status)) {
 506                                 tz->trips.active[i].flags.valid = 0;
 507                                 if (i == 0)
 508                                         break;
 509                                 if (act <= 0)
 510                                         break;
 511                                 if (i == 1)
 512                                         tz->trips.active[0].temperature =
 513                                                 CELSIUS_TO_KELVIN(act);
 514                                 else
 515                                         /*
 516                                          * Don't allow override higher than
 517                                          * the next higher trip point
 518                                          */
 519                                         tz->trips.active[i - 1].temperature =
 520                                                 (tz->trips.active[i - 2].temperature <
 521                                                 CELSIUS_TO_KELVIN(act) ?
 522                                                 tz->trips.active[i - 2].temperature :
 523                                                 CELSIUS_TO_KELVIN(act));
 524                                 break;
 525                         } else {
 526                                 tz->trips.active[i].temperature = tmp;
 527                                 tz->trips.active[i].flags.valid = 1;
 528                         }
 529                 }
 530
 531                 name[2] = 'L';
 532                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
 533                         memset(&devices, 0, sizeof(struct acpi_handle_list));
 534                         status = acpi_evaluate_reference(tz->device->handle,
 535                                                 name, NULL, &devices);
 536                         if (ACPI_FAILURE(status)) {
 537                                 printk(KERN_WARNING PREFIX
 538                                         "Invalid active%d threshold\n", i);
 539                                 tz->trips.active[i].flags.valid = 0;
 540                         }
 541                         else
 542                                 tz->trips.active[i].flags.valid = 1;
 543
 544                         if (memcmp(&tz->trips.active[i].devices, &devices,
 545                                         sizeof(struct acpi_handle_list))) {
 546                                 memcpy(&tz->trips.active[i].devices, &devices,
 547                                         sizeof(struct acpi_handle_list));
 548                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 549                         }
 550                 }
 551                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
 552                         if (valid != tz->trips.active[i].flags.valid)
 553                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
 554
 555                 if (!tz->trips.active[i].flags.valid)
 556                         break;
 557         }
 558
 559         if (flag & ACPI_TRIPS_DEVICES) {
 560                 memset(&devices, 0, sizeof(struct acpi_handle_list));
 561                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
 562                                                 NULL, &devices);
 563                 if (memcmp(&tz->devices, &devices,
 564                                 sizeof(struct acpi_handle_list))) {
 565                         memcpy(&tz->devices, &devices,
 566                                 sizeof(struct acpi_handle_list));
 567                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
 568                 }
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 575 {
 576         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
 577 }
 578
 579 static void acpi_thermal_check(void *data)
 580 {
 581         struct acpi_thermal *tz = data;
 582
 583         thermal_zone_device_update(tz->thermal_zone);
 584 }
 585
 586 /* sys I/F for generic thermal sysfs support */
 587 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
 588
 589 static int thermal_get_temp(struct thermal_zone_device *thermal,
 590                             unsigned long *temp)
 591 {
 592         struct acpi_thermal *tz = thermal->devdata;
 593         int result;
 594
 595         if (!tz)
 596                 return -EINVAL;
 597
 598         result = acpi_thermal_get_temperature(tz);
 599         if (result)
 600                 return result;
 601
 602         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
 603         return 0;
 604 }
 605
 606 static const char enabled[] = "kernel";
 607 static const char disabled[] = "user";
 608 static int thermal_get_mode(struct thermal_zone_device *thermal,
 609                                 enum thermal_device_mode *mode)
 610 {
 611         struct acpi_thermal *tz = thermal->devdata;
 612
 613         if (!tz)
 614                 return -EINVAL;
 615
 616         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
 617                 THERMAL_DEVICE_DISABLED;
 618
 619         return 0;
 620 }
 621
 622 static int thermal_set_mode(struct thermal_zone_device *thermal,
 623                                 enum thermal_device_mode mode)
 624 {
 625         struct acpi_thermal *tz = thermal->devdata;
 626         int enable;
 627
 628         if (!tz)
 629                 return -EINVAL;
 630
 631         /*
 632          * enable/disable thermal management from ACPI thermal driver
 633          */
 634         if (mode == THERMAL_DEVICE_ENABLED)
 635                 enable = 1;
 636         else if (mode == THERMAL_DEVICE_DISABLED)
 637                 enable = 0;
 638         else
 639                 return -EINVAL;
 640
 641         if (enable != tz->tz_enabled) {
 642                 tz->tz_enabled = enable;
 643                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 644                         "%s ACPI thermal control\n",
 645                         tz->tz_enabled ? enabled : disabled));
 646                 acpi_thermal_check(tz);
 647         }
 648         return 0;
 649 }
 650
 651 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 652                                  int trip, enum thermal_trip_type *type)
 653 {
 654         struct acpi_thermal *tz = thermal->devdata;
 655         int i;
 656
 657         if (!tz || trip < 0)
 658                 return -EINVAL;
 659
 660         if (tz->trips.critical.flags.valid) {
 661                 if (!trip) {
 662                         *type = THERMAL_TRIP_CRITICAL;
 663                         return 0;
 664                 }
 665                 trip--;
 666         }
 667
 668         if (tz->trips.hot.flags.valid) {
 669                 if (!trip) {
 670                         *type = THERMAL_TRIP_HOT;
 671                         return 0;
 672                 }
 673                 trip--;
 674         }
 675
 676         if (tz->trips.passive.flags.valid) {
 677                 if (!trip) {
 678                         *type = THERMAL_TRIP_PASSIVE;
 679                         return 0;
 680                 }
 681                 trip--;
 682         }
 683
 684         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 685                 tz->trips.active[i].flags.valid; i++) {
 686                 if (!trip) {
 687                         *type = THERMAL_TRIP_ACTIVE;
 688                         return 0;
 689                 }
 690                 trip--;
 691         }
 692
 693         return -EINVAL;
 694 }
 695
 696 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 697                                  int trip, unsigned long *temp)
 698 {
 699         struct acpi_thermal *tz = thermal->devdata;
 700         int i;
 701
 702         if (!tz || trip < 0)
 703                 return -EINVAL;
 704
 705         if (tz->trips.critical.flags.valid) {
 706                 if (!trip) {
 707                         *temp = KELVIN_TO_MILLICELSIUS(
 708                                 tz->trips.critical.temperature,
 709                                 tz->kelvin_offset);
 710                         return 0;
 711                 }
 712                 trip--;
 713         }
 714
 715         if (tz->trips.hot.flags.valid) {
 716                 if (!trip) {
 717                         *temp = KELVIN_TO_MILLICELSIUS(
 718                                 tz->trips.hot.temperature,
 719                                 tz->kelvin_offset);
 720                         return 0;
 721                 }
 722                 trip--;
 723         }
 724
 725         if (tz->trips.passive.flags.valid) {
 726                 if (!trip) {
 727                         *temp = KELVIN_TO_MILLICELSIUS(
 728                                 tz->trips.passive.temperature,
 729                                 tz->kelvin_offset);
 730                         return 0;
 731                 }
 732                 trip--;
 733         }
 734
 735         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 736                 tz->trips.active[i].flags.valid; i++) {
 737                 if (!trip) {
 738                         *temp = KELVIN_TO_MILLICELSIUS(
 739                                 tz->trips.active[i].temperature,
 740                                 tz->kelvin_offset);
 741                         return 0;
 742                 }
 743                 trip--;
 744         }
 745
 746         return -EINVAL;
 747 }
 748
 749 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 750                                 unsigned long *temperature) {
 751         struct acpi_thermal *tz = thermal->devdata;
 752
 753         if (tz->trips.critical.flags.valid) {
 754                 *temperature = KELVIN_TO_MILLICELSIUS(
 755                                 tz->trips.critical.temperature,
 756                                 tz->kelvin_offset);
 757                 return 0;
 758         } else
 759                 return -EINVAL;
 760 }
 761
 762 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 763                            enum thermal_trip_type trip_type)
 764 {
 765         u8 type = 0;
 766         struct acpi_thermal *tz = thermal->devdata;
 767
 768         if (trip_type == THERMAL_TRIP_CRITICAL)
 769                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
 770         else if (trip_type == THERMAL_TRIP_HOT)
 771                 type = ACPI_THERMAL_NOTIFY_HOT;
 772         else
 773                 return 0;
 774
 775         acpi_bus_generate_proc_event(tz->device, type, 1);
 776         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
 777                                         dev_name(&tz->device->dev), type, 1);
 778
 779         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
 780                 return 1;
 781
 782         return 0;
 783 }
 784
 785 typedef int (*cb)(struct thermal_zone_device *, int,
 786                   struct thermal_cooling_device *);
 787 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 788                                         struct thermal_cooling_device *cdev,
 789                                         cb action)
 790 {
 791         struct acpi_device *device = cdev->devdata;
 792         struct acpi_thermal *tz = thermal->devdata;
 793         struct acpi_device *dev;
 794         acpi_status status;
 795         acpi_handle handle;
 796         int i;
 797         int j;
 798         int trip = -1;
 799         int result = 0;
 800
 801         if (tz->trips.critical.flags.valid)
 802                 trip++;
 803
 804         if (tz->trips.hot.flags.valid)
 805                 trip++;
 806
 807         if (tz->trips.passive.flags.valid) {
 808                 trip++;
 809                 for (i = 0; i < tz->trips.passive.devices.count;
 810                     i++) {
 811                         handle = tz->trips.passive.devices.handles[i];
 812                         status = acpi_bus_get_device(handle, &dev);
 813                         if (ACPI_SUCCESS(status) && (dev == device)) {
 814                                 result = action(thermal, trip, cdev);
 815                                 if (result)
 816                                         goto failed;
 817                         }
 818                 }
 819         }
 820
 821         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 822                 if (!tz->trips.active[i].flags.valid)
 823                         break;
 824                 trip++;
 825                 for (j = 0;
 826                     j < tz->trips.active[i].devices.count;
 827                     j++) {
 828                         handle = tz->trips.active[i].devices.handles[j];
 829                         status = acpi_bus_get_device(handle, &dev);
 830                         if (ACPI_SUCCESS(status) && (dev == device)) {
 831                                 result = action(thermal, trip, cdev);
 832                                 if (result)
 833                                         goto failed;
 834                         }
 835                 }
 836         }
 837
 838         for (i = 0; i < tz->devices.count; i++) {
 839                 handle = tz->devices.handles[i];
 840                 status = acpi_bus_get_device(handle, &dev);
 841                 if (ACPI_SUCCESS(status) && (dev == device)) {
 842                         result = action(thermal, -1, cdev);
 843                         if (result)
 844                                 goto failed;
 845                 }
 846         }
 847
 848 failed:
 849         return result;
 850 }
 851
 852 static int
 853 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 854                                         struct thermal_cooling_device *cdev)
 855 {
 856         return acpi_thermal_cooling_device_cb(thermal, cdev,
 857                                 thermal_zone_bind_cooling_device);
 858 }
 859
 860 static int
 861 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 862                                         struct thermal_cooling_device *cdev)
 863 {
 864         return acpi_thermal_cooling_device_cb(thermal, cdev,
 865                                 thermal_zone_unbind_cooling_device);
 866 }
 867
 868 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 869         .bind = acpi_thermal_bind_cooling_device,
 870         .unbind = acpi_thermal_unbind_cooling_device,
 871         .get_temp = thermal_get_temp,
 872         .get_mode = thermal_get_mode,
 873         .set_mode = thermal_set_mode,
 874         .get_trip_type = thermal_get_trip_type,
 875         .get_trip_temp = thermal_get_trip_temp,
 876         .get_crit_temp = thermal_get_crit_temp,
 877         .notify = thermal_notify,
 878 };
 879
 880 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 881 {
 882         int trips = 0;
 883         int result;
 884         acpi_status status;
 885         int i;
 886
 887         if (tz->trips.critical.flags.valid)
 888                 trips++;
 889
 890         if (tz->trips.hot.flags.valid)
 891                 trips++;
 892
 893         if (tz->trips.passive.flags.valid)
 894                 trips++;
 895
 896         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 897                         tz->trips.active[i].flags.valid; i++, trips++);
 898
 899         if (tz->trips.passive.flags.valid)
 900                 tz->thermal_zone =
 901                         thermal_zone_device_register("acpitz", trips, tz,
 902                                                      &acpi_thermal_zone_ops,
 903                                                      tz->trips.passive.tc1,
 904                                                      tz->trips.passive.tc2,
 905                                                      tz->trips.passive.tsp*100,
 906                                                      tz->polling_frequency*100);
 907         else
 908                 tz->thermal_zone =
 909                         thermal_zone_device_register("acpitz", trips, tz,
 910                                                      &acpi_thermal_zone_ops,
 911                                                      0, 0, 0,
 912                                                      tz->polling_frequency*100);
 913         if (IS_ERR(tz->thermal_zone))
 914                 return -ENODEV;
 915
 916         result = sysfs_create_link(&tz->device->dev.kobj,
 917                                    &tz->thermal_zone->device.kobj, "thermal_zone");
 918         if (result)
 919                 return result;
 920
 921         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
 922                                    &tz->device->dev.kobj, "device");
 923         if (result)
 924                 return result;
 925
 926         status = acpi_attach_data(tz->device->handle,
 927                                   acpi_bus_private_data_handler,
 928                                   tz->thermal_zone);
 929         if (ACPI_FAILURE(status)) {
 930                 printk(KERN_ERR PREFIX
 931                                 "Error attaching device data\n");
 932                 return -ENODEV;
 933         }
 934
 935         tz->tz_enabled = 1;
 936
 937         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 938                  tz->thermal_zone->id);
 939         return 0;
 940 }
 941
 942 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 943 {
 944         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
 945         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 946         thermal_zone_device_unregister(tz->thermal_zone);
 947         tz->thermal_zone = NULL;
 948         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
 949 }
 950
 951
 952 /* --------------------------------------------------------------------------
 953                               FS Interface (/proc)
 954    -------------------------------------------------------------------------- */
 955
 956 static struct proc_dir_entry *acpi_thermal_dir;
 957
 958 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
 959 {
 960         struct acpi_thermal *tz = seq->private;
 961
 962
 963         if (!tz)
 964                 goto end;
 965
 966         seq_puts(seq, "state:                   ");
 967
 968         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
 969             && !tz->state.active)
 970                 seq_puts(seq, "ok\n");
 971         else {
 972                 if (tz->state.critical)
 973                         seq_puts(seq, "critical ");
 974                 if (tz->state.hot)
 975                         seq_puts(seq, "hot ");
 976                 if (tz->state.passive)
 977                         seq_puts(seq, "passive ");
 978                 if (tz->state.active)
 979                         seq_printf(seq, "active[%d]", tz->state.active_index);
 980                 seq_puts(seq, "\n");
 981         }
 982
 983       end:
 984         return 0;
 985 }
 986
 987 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
 988 {
 989         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
 990 }
 991
 992 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
 993 {
 994         int result = 0;
 995         struct acpi_thermal *tz = seq->private;
 996
 997
 998         if (!tz)
 999                 goto end;
1000
1001         result = acpi_thermal_get_temperature(tz);
1002         if (result)
1003                 goto end;
1004
1005         seq_printf(seq, "temperature:             %ld C\n",
1006                    KELVIN_TO_CELSIUS(tz->temperature));
1007
1008       end:
1009         return 0;
1010 }
1011
1012 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1013 {
1014         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1015 }
1016
1017 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1018 {
1019         struct acpi_thermal *tz = seq->private;
1020         struct acpi_device *device;
1021         acpi_status status;
1022
1023         int i = 0;
1024         int j = 0;
1025
1026
1027         if (!tz)
1028                 goto end;
1029
1030         if (tz->trips.critical.flags.valid)
1031                 seq_printf(seq, "critical (S5):           %ld C%s",
1032                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1033                            nocrt ? " <disabled>\n" : "\n");
1034
1035         if (tz->trips.hot.flags.valid)
1036                 seq_printf(seq, "hot (S4):                %ld C%s",
1037                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1038                            nocrt ? " <disabled>\n" : "\n");
1039
1040         if (tz->trips.passive.flags.valid) {
1041                 seq_printf(seq,
1042                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1043                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1044                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1045                            tz->trips.passive.tsp);
1046                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1047                         status = acpi_bus_get_device(tz->trips.passive.devices.
1048                                                      handles[j], &device);
1049                         seq_printf(seq, "%4.4s ", status ? "" :
1050                                    acpi_device_bid(device));
1051                 }
1052                 seq_puts(seq, "\n");
1053         }
1054
1055         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1056                 if (!(tz->trips.active[i].flags.valid))
1057                         break;
1058                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1059                            i,
1060                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1061                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1062                         status = acpi_bus_get_device(tz->trips.active[i].
1063                                                      devices.handles[j],
1064                                                      &device);
1065                         seq_printf(seq, "%4.4s ", status ? "" :
1066                                    acpi_device_bid(device));
1067                 }
1068                 seq_puts(seq, "\n");
1069         }
1070
1071       end:
1072         return 0;
1073 }
1074
1075 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1076 {
1077         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1078 }
1079
1080 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1081 {
1082         struct acpi_thermal *tz = seq->private;
1083
1084
1085         if (!tz)
1086                 goto end;
1087
1088         if (!tz->flags.cooling_mode)
1089                 seq_puts(seq, "<setting not supported>\n");
1090         else
1091                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1092
1093       end:
1094         return 0;
1095 }
1096
1097 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1098 {
1099         return single_open(file, acpi_thermal_cooling_seq_show,
1100                            PDE(inode)->data);
1101 }
1102
1103 static ssize_t
1104 acpi_thermal_write_cooling_mode(struct file *file,
1105                                 const char __user * buffer,
1106                                 size_t count, loff_t * ppos)
1107 {
1108         struct seq_file *m = file->private_data;
1109         struct acpi_thermal *tz = m->private;
1110         int result = 0;
1111         char mode_string[12] = { '\0' };
1112
1113
1114         if (!tz || (count > sizeof(mode_string) - 1))
1115                 return -EINVAL;
1116
1117         if (!tz->flags.cooling_mode)
1118                 return -ENODEV;
1119
1120         if (copy_from_user(mode_string, buffer, count))
1121                 return -EFAULT;
1122
1123         mode_string[count] = '\0';
1124
1125         result = acpi_thermal_set_cooling_mode(tz,
1126                                                simple_strtoul(mode_string, NULL,
1127                                                               0));
1128         if (result)
1129                 return result;
1130
1131         acpi_thermal_check(tz);
1132
1133         return count;
1134 }
1135
1136 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1137 {
1138         struct acpi_thermal *tz = seq->private;
1139
1140
1141         if (!tz)
1142                 goto end;
1143
1144         if (!tz->thermal_zone->polling_delay) {
1145                 seq_puts(seq, "<polling disabled>\n");
1146                 goto end;
1147         }
1148
1149         seq_printf(seq, "polling frequency:       %d seconds\n",
1150                    (tz->thermal_zone->polling_delay / 1000));
1151
1152       end:
1153         return 0;
1154 }
1155
1156 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1157 {
1158         return single_open(file, acpi_thermal_polling_seq_show,
1159                            PDE(inode)->data);
1160 }
1161
1162 static ssize_t
1163 acpi_thermal_write_polling(struct file *file,
1164                            const char __user * buffer,
1165                            size_t count, loff_t * ppos)
1166 {
1167         struct seq_file *m = file->private_data;
1168         struct acpi_thermal *tz = m->private;
1169         int result = 0;
1170         char polling_string[12] = { '\0' };
1171         int seconds = 0;
1172
1173
1174         if (!tz || (count > sizeof(polling_string) - 1))
1175                 return -EINVAL;
1176
1177         if (copy_from_user(polling_string, buffer, count))
1178                 return -EFAULT;
1179
1180         polling_string[count] = '\0';
1181
1182         seconds = simple_strtoul(polling_string, NULL, 0);
1183
1184         result = acpi_thermal_set_polling(tz, seconds);
1185         if (result)
1186                 return result;
1187
1188         acpi_thermal_check(tz);
1189
1190         return count;
1191 }
1192
1193 static int acpi_thermal_add_fs(struct acpi_device *device)
1194 {
1195         struct proc_dir_entry *entry = NULL;
1196
1197
1198         if (!acpi_device_dir(device)) {
1199                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1200                                                      acpi_thermal_dir);
1201                 if (!acpi_device_dir(device))
1202                         return -ENODEV;
1203         }
1204
1205         /* 'state' [R] */
1206         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1207                                  S_IRUGO, acpi_device_dir(device),
1208                                  &acpi_thermal_state_fops,
1209                                  acpi_driver_data(device));
1210         if (!entry)
1211                 return -ENODEV;
1212
1213         /* 'temperature' [R] */
1214         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1215                                  S_IRUGO, acpi_device_dir(device),
1216                                  &acpi_thermal_temp_fops,
1217                                  acpi_driver_data(device));
1218         if (!entry)
1219                 return -ENODEV;
1220
1221         /* 'trip_points' [R] */
1222         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1223                                  S_IRUGO,
1224                                  acpi_device_dir(device),
1225                                  &acpi_thermal_trip_fops,
1226                                  acpi_driver_data(device));
1227         if (!entry)
1228                 return -ENODEV;
1229
1230         /* 'cooling_mode' [R/W] */
1231         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1232                                  S_IFREG | S_IRUGO | S_IWUSR,
1233                                  acpi_device_dir(device),
1234                                  &acpi_thermal_cooling_fops,
1235                                  acpi_driver_data(device));
1236         if (!entry)
1237                 return -ENODEV;
1238
1239         /* 'polling_frequency' [R/W] */
1240         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1241                                  S_IFREG | S_IRUGO | S_IWUSR,
1242                                  acpi_device_dir(device),
1243                                  &acpi_thermal_polling_fops,
1244                                  acpi_driver_data(device));
1245         if (!entry)
1246                 return -ENODEV;
1247         return 0;
1248 }
1249
1250 static int acpi_thermal_remove_fs(struct acpi_device *device)
1251 {
1252
1253         if (acpi_device_dir(device)) {
1254                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1255                                   acpi_device_dir(device));
1256                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1257                                   acpi_device_dir(device));
1258                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1259                                   acpi_device_dir(device));
1260                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1261                                   acpi_device_dir(device));
1262                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1263                                   acpi_device_dir(device));
1264                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1265                 acpi_device_dir(device) = NULL;
1266         }
1267
1268         return 0;
1269 }
1270
1271 /* --------------------------------------------------------------------------
1272                                  Driver Interface
1273    -------------------------------------------------------------------------- */
1274
1275 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1276 {
1277         struct acpi_thermal *tz = acpi_driver_data(device);
1278
1279
1280         if (!tz)
1281                 return;
1282
1283         switch (event) {
1284         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1285                 acpi_thermal_check(tz);
1286                 break;
1287         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1288                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1289                 acpi_thermal_check(tz);
1290                 acpi_bus_generate_proc_event(device, event, 0);
1291                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1292                                                   dev_name(&device->dev), event, 0);
1293                 break;
1294         case ACPI_THERMAL_NOTIFY_DEVICES:
1295                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1296                 acpi_thermal_check(tz);
1297                 acpi_bus_generate_proc_event(device, event, 0);
1298                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1299                                                   dev_name(&device->dev), event, 0);
1300                 break;
1301         default:
1302                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1303                                   "Unsupported event [0x%x]\n", event));
1304                 break;
1305         }
1306 }
1307
1308 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1309 {
1310         int result = 0;
1311
1312
1313         if (!tz)
1314                 return -EINVAL;
1315
1316         /* Get temperature [_TMP] (required) */
1317         result = acpi_thermal_get_temperature(tz);
1318         if (result)
1319                 return result;
1320
1321         /* Get trip points [_CRT, _PSV, etc.] (required) */
1322         result = acpi_thermal_get_trip_points(tz);
1323         if (result)
1324                 return result;
1325
1326         /* Set the cooling mode [_SCP] to active cooling (default) */
1327         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1328         if (!result)
1329                 tz->flags.cooling_mode = 1;
1330
1331         /* Get default polling frequency [_TZP] (optional) */
1332         if (tzp)
1333                 tz->polling_frequency = tzp;
1334         else
1335                 acpi_thermal_get_polling_frequency(tz);
1336
1337         return 0;
1338 }
1339
1340 /*
1341  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1342  * handles temperature values with a single decimal place. As a consequence,
1343  * some implementations use an offset of 273.1 and others use an offset of
1344  * 273.2. Try to find out which one is being used, to present the most
1345  * accurate and visually appealing number.
1346  *
1347  * The heuristic below should work for all ACPI thermal zones which have a
1348  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1349  */
1350 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1351 {
1352         if (tz->trips.critical.flags.valid &&
1353             (tz->trips.critical.temperature % 5) == 1)
1354                 tz->kelvin_offset = 2731;
1355         else
1356                 tz->kelvin_offset = 2732;
1357 }
1358
1359 static int acpi_thermal_add(struct acpi_device *device)
1360 {
1361         int result = 0;
1362         struct acpi_thermal *tz = NULL;
1363
1364
1365         if (!device)
1366                 return -EINVAL;
1367
1368         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1369         if (!tz)
1370                 return -ENOMEM;
1371
1372         tz->device = device;
1373         strcpy(tz->name, device->pnp.bus_id);
1374         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1375         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1376         device->driver_data = tz;
1377         mutex_init(&tz->lock);
1378
1379
1380         result = acpi_thermal_get_info(tz);
1381         if (result)
1382                 goto free_memory;
1383
1384         acpi_thermal_guess_offset(tz);
1385
1386         result = acpi_thermal_register_thermal_zone(tz);
1387         if (result)
1388                 goto free_memory;
1389
1390         result = acpi_thermal_add_fs(device);
1391         if (result)
1392                 goto unregister_thermal_zone;
1393
1394         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1395                acpi_device_name(device), acpi_device_bid(device),
1396                KELVIN_TO_CELSIUS(tz->temperature));
1397         goto end;
1398
1399 unregister_thermal_zone:
1400         thermal_zone_device_unregister(tz->thermal_zone);
1401 free_memory:
1402         kfree(tz);
1403 end:
1404         return result;
1405 }
1406
1407 static int acpi_thermal_remove(struct acpi_device *device, int type)
1408 {
1409         struct acpi_thermal *tz = NULL;
1410
1411         if (!device || !acpi_driver_data(device))
1412                 return -EINVAL;
1413
1414         tz = acpi_driver_data(device);
1415
1416         acpi_thermal_remove_fs(device);
1417         acpi_thermal_unregister_thermal_zone(tz);
1418         mutex_destroy(&tz->lock);
1419         kfree(tz);
1420         return 0;
1421 }
1422
1423 static int acpi_thermal_resume(struct acpi_device *device)
1424 {
1425         struct acpi_thermal *tz = NULL;
1426         int i, j, power_state, result;
1427
1428
1429         if (!device || !acpi_driver_data(device))
1430                 return -EINVAL;
1431
1432         tz = acpi_driver_data(device);
1433
1434         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1435                 if (!(&tz->trips.active[i]))
1436                         break;
1437                 if (!tz->trips.active[i].flags.valid)
1438                         break;
1439                 tz->trips.active[i].flags.enabled = 1;
1440                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1441                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1442                             handles[j], &power_state);
1443                         if (result || (power_state != ACPI_STATE_D0)) {
1444                                 tz->trips.active[i].flags.enabled = 0;
1445                                 break;
1446                         }
1447                 }
1448                 tz->state.active |= tz->trips.active[i].flags.enabled;
1449         }
1450
1451         acpi_thermal_check(tz);
1452
1453         return AE_OK;
1454 }
1455
1456 static int thermal_act(const struct dmi_system_id *d) {
1457
1458         if (act == 0) {
1459                 printk(KERN_NOTICE "ACPI: %s detected: "
1460                         "disabling all active thermal trip points\n", d->ident);
1461                 act = -1;
1462         }
1463         return 0;
1464 }
1465 static int thermal_nocrt(const struct dmi_system_id *d) {
1466
1467         printk(KERN_NOTICE "ACPI: %s detected: "
1468                 "disabling all critical thermal trip point actions.\n", d->ident);
1469         nocrt = 1;
1470         return 0;
1471 }
1472 static int thermal_tzp(const struct dmi_system_id *d) {
1473
1474         if (tzp == 0) {
1475                 printk(KERN_NOTICE "ACPI: %s detected: "
1476                         "enabling thermal zone polling\n", d->ident);
1477                 tzp = 300;      /* 300 dS = 30 Seconds */
1478         }
1479         return 0;
1480 }
1481 static int thermal_psv(const struct dmi_system_id *d) {
1482
1483         if (psv == 0) {
1484                 printk(KERN_NOTICE "ACPI: %s detected: "
1485                         "disabling all passive thermal trip points\n", d->ident);
1486                 psv = -1;
1487         }
1488         return 0;
1489 }
1490
1491 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1492         /*
1493          * Award BIOS on this AOpen makes thermal control almost worthless.
1494          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1495          */
1496         {
1497          .callback = thermal_act,
1498          .ident = "AOpen i915GMm-HFS",
1499          .matches = {
1500                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1501                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1502                 },
1503         },
1504         {
1505          .callback = thermal_psv,
1506          .ident = "AOpen i915GMm-HFS",
1507          .matches = {
1508                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1509                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1510                 },
1511         },
1512         {
1513          .callback = thermal_tzp,
1514          .ident = "AOpen i915GMm-HFS",
1515          .matches = {
1516                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1517                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1518                 },
1519         },
1520         {
1521          .callback = thermal_nocrt,
1522          .ident = "Gigabyte GA-7ZX",
1523          .matches = {
1524                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1525                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1526                 },
1527         },
1528         {}
1529 };
1530
1531 static int __init acpi_thermal_init(void)
1532 {
1533         int result = 0;
1534
1535         dmi_check_system(thermal_dmi_table);
1536
1537         if (off) {
1538                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1539                 return -ENODEV;
1540         }
1541         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1542         if (!acpi_thermal_dir)
1543                 return -ENODEV;
1544
1545         result = acpi_bus_register_driver(&acpi_thermal_driver);
1546         if (result < 0) {
1547                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1548                 return -ENODEV;
1549         }
1550
1551         return 0;
1552 }
1553
1554 static void __exit acpi_thermal_exit(void)
1555 {
1556
1557         acpi_bus_unregister_driver(&acpi_thermal_driver);
1558
1559         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1560
1561         return;
1562 }
1563
1564 module_init(acpi_thermal_init);
1565 module_exit(acpi_thermal_exit);