SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/thermal/thermal_sys.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  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
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/err.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/idr.h>
  31 #include <linux/thermal.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/reboot.h>
  34
  35 MODULE_AUTHOR("Zhang Rui");
  36 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  37 MODULE_LICENSE("GPL");
  38
  39 #define PREFIX "Thermal: "
  40
  41 struct thermal_cooling_device_instance {
  42         int id;
  43         char name[THERMAL_NAME_LENGTH];
  44         struct thermal_zone_device *tz;
  45         struct thermal_cooling_device *cdev;
  46         int trip;
  47         char attr_name[THERMAL_NAME_LENGTH];
  48         struct device_attribute attr;
  49         struct list_head node;
  50 };
  51
  52 static DEFINE_IDR(thermal_tz_idr);
  53 static DEFINE_IDR(thermal_cdev_idr);
  54 static DEFINE_MUTEX(thermal_idr_lock);
  55
  56 static LIST_HEAD(thermal_tz_list);
  57 static LIST_HEAD(thermal_cdev_list);
  58 static DEFINE_MUTEX(thermal_list_lock);
  59
  60 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  61 {
  62         int err;
  63
  64       again:
  65         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  66                 return -ENOMEM;
  67
  68         if (lock)
  69                 mutex_lock(lock);
  70         err = idr_get_new(idr, NULL, id);
  71         if (lock)
  72                 mutex_unlock(lock);
  73         if (unlikely(err == -EAGAIN))
  74                 goto again;
  75         else if (unlikely(err))
  76                 return err;
  77
  78         *id = *id & MAX_ID_MASK;
  79         return 0;
  80 }
  81
  82 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  83 {
  84         if (lock)
  85                 mutex_lock(lock);
  86         idr_remove(idr, id);
  87         if (lock)
  88                 mutex_unlock(lock);
  89 }
  90
  91 /* sys I/F for thermal zone */
  92
  93 #define to_thermal_zone(_dev) \
  94         container_of(_dev, struct thermal_zone_device, device)
  95
  96 static ssize_t
  97 type_show(struct device *dev, struct device_attribute *attr, char *buf)
  98 {
  99         struct thermal_zone_device *tz = to_thermal_zone(dev);
 100
 101         return sprintf(buf, "%s\n", tz->type);
 102 }
 103
 104 static ssize_t
 105 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 106 {
 107         struct thermal_zone_device *tz = to_thermal_zone(dev);
 108         long temperature;
 109         int ret;
 110
 111         if (!tz->ops->get_temp)
 112                 return -EPERM;
 113
 114         ret = tz->ops->get_temp(tz, &temperature);
 115
 116         if (ret)
 117                 return ret;
 118
 119         return sprintf(buf, "%ld\n", temperature);
 120 }
 121
 122 static ssize_t
 123 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 124 {
 125         struct thermal_zone_device *tz = to_thermal_zone(dev);
 126         enum thermal_device_mode mode;
 127         int result;
 128
 129         if (!tz->ops->get_mode)
 130                 return -EPERM;
 131
 132         result = tz->ops->get_mode(tz, &mode);
 133         if (result)
 134                 return result;
 135
 136         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 137                        : "disabled");
 138 }
 139
 140 static ssize_t
 141 mode_store(struct device *dev, struct device_attribute *attr,
 142            const char *buf, size_t count)
 143 {
 144         struct thermal_zone_device *tz = to_thermal_zone(dev);
 145         int result;
 146
 147         if (!tz->ops->set_mode)
 148                 return -EPERM;
 149
 150         if (!strncmp(buf, "enabled", sizeof("enabled")))
 151                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 152         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 153                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 154         else
 155                 result = -EINVAL;
 156
 157         if (result)
 158                 return result;
 159
 160         return count;
 161 }
 162
 163 static ssize_t
 164 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 165                      char *buf)
 166 {
 167         struct thermal_zone_device *tz = to_thermal_zone(dev);
 168         enum thermal_trip_type type;
 169         int trip, result;
 170
 171         if (!tz->ops->get_trip_type)
 172                 return -EPERM;
 173
 174         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 175                 return -EINVAL;
 176
 177         result = tz->ops->get_trip_type(tz, trip, &type);
 178         if (result)
 179                 return result;
 180
 181         switch (type) {
 182         case THERMAL_TRIP_CRITICAL:
 183                 return sprintf(buf, "critical");
 184         case THERMAL_TRIP_HOT:
 185                 return sprintf(buf, "hot");
 186         case THERMAL_TRIP_PASSIVE:
 187                 return sprintf(buf, "passive");
 188         case THERMAL_TRIP_ACTIVE:
 189                 return sprintf(buf, "active");
 190         default:
 191                 return sprintf(buf, "unknown");
 192         }
 193 }
 194
 195 static ssize_t
 196 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 197                      char *buf)
 198 {
 199         struct thermal_zone_device *tz = to_thermal_zone(dev);
 200         int trip, ret;
 201         long temperature;
 202
 203         if (!tz->ops->get_trip_temp)
 204                 return -EPERM;
 205
 206         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 207                 return -EINVAL;
 208
 209         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 210
 211         if (ret)
 212                 return ret;
 213
 214         return sprintf(buf, "%ld\n", temperature);
 215 }
 216
 217 static DEVICE_ATTR(type, 0444, type_show, NULL);
 218 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 219 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 220
 221 static struct device_attribute trip_point_attrs[] = {
 222         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 223         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 224         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 225         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 226         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 227         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 228         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 229         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 230         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 231         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 232         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 233         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 234         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 235         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 236         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 237         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 238         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 239         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 240         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 241         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 242         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 243         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 244         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 245         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 246 };
 247
 248 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 249 do {    \
 250         result = device_create_file(_dev,       \
 251                                 &trip_point_attrs[_index * 2]); \
 252         if (result)     \
 253                 break;  \
 254         result = device_create_file(_dev,       \
 255                         &trip_point_attrs[_index * 2 + 1]);     \
 256 } while (0)
 257
 258 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 259 do {    \
 260         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 261         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 262 } while (0)
 263
 264 /* sys I/F for cooling device */
 265 #define to_cooling_device(_dev) \
 266         container_of(_dev, struct thermal_cooling_device, device)
 267
 268 static ssize_t
 269 thermal_cooling_device_type_show(struct device *dev,
 270                                  struct device_attribute *attr, char *buf)
 271 {
 272         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 273
 274         return sprintf(buf, "%s\n", cdev->type);
 275 }
 276
 277 static ssize_t
 278 thermal_cooling_device_max_state_show(struct device *dev,
 279                                       struct device_attribute *attr, char *buf)
 280 {
 281         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 282         unsigned long state;
 283         int ret;
 284
 285         ret = cdev->ops->get_max_state(cdev, &state);
 286         if (ret)
 287                 return ret;
 288         return sprintf(buf, "%ld\n", state);
 289 }
 290
 291 static ssize_t
 292 thermal_cooling_device_cur_state_show(struct device *dev,
 293                                       struct device_attribute *attr, char *buf)
 294 {
 295         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 296         unsigned long state;
 297         int ret;
 298
 299         ret = cdev->ops->get_cur_state(cdev, &state);
 300         if (ret)
 301                 return ret;
 302         return sprintf(buf, "%ld\n", state);
 303 }
 304
 305 static ssize_t
 306 thermal_cooling_device_cur_state_store(struct device *dev,
 307                                        struct device_attribute *attr,
 308                                        const char *buf, size_t count)
 309 {
 310         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 311         unsigned long state;
 312         int result;
 313
 314         if (!sscanf(buf, "%ld\n", &state))
 315                 return -EINVAL;
 316
 317         if (state < 0)
 318                 return -EINVAL;
 319
 320         result = cdev->ops->set_cur_state(cdev, state);
 321         if (result)
 322                 return result;
 323         return count;
 324 }
 325
 326 static struct device_attribute dev_attr_cdev_type =
 327 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 328 static DEVICE_ATTR(max_state, 0444,
 329                    thermal_cooling_device_max_state_show, NULL);
 330 static DEVICE_ATTR(cur_state, 0644,
 331                    thermal_cooling_device_cur_state_show,
 332                    thermal_cooling_device_cur_state_store);
 333
 334 static ssize_t
 335 thermal_cooling_device_trip_point_show(struct device *dev,
 336                                        struct device_attribute *attr, char *buf)
 337 {
 338         struct thermal_cooling_device_instance *instance;
 339
 340         instance =
 341             container_of(attr, struct thermal_cooling_device_instance, attr);
 342
 343         if (instance->trip == THERMAL_TRIPS_NONE)
 344                 return sprintf(buf, "-1\n");
 345         else
 346                 return sprintf(buf, "%d\n", instance->trip);
 347 }
 348
 349 /* Device management */
 350
 351 #if defined(CONFIG_THERMAL_HWMON)
 352
 353 /* hwmon sys I/F */
 354 #include <linux/hwmon.h>
 355 static LIST_HEAD(thermal_hwmon_list);
 356
 357 static ssize_t
 358 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 359 {
 360         struct thermal_hwmon_device *hwmon = dev->driver_data;
 361         return sprintf(buf, "%s\n", hwmon->type);
 362 }
 363 static DEVICE_ATTR(name, 0444, name_show, NULL);
 364
 365 static ssize_t
 366 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 367 {
 368         long temperature;
 369         int ret;
 370         struct thermal_hwmon_attr *hwmon_attr
 371                         = container_of(attr, struct thermal_hwmon_attr, attr);
 372         struct thermal_zone_device *tz
 373                         = container_of(hwmon_attr, struct thermal_zone_device,
 374                                        temp_input);
 375
 376         ret = tz->ops->get_temp(tz, &temperature);
 377
 378         if (ret)
 379                 return ret;
 380
 381         return sprintf(buf, "%ld\n", temperature);
 382 }
 383
 384 static ssize_t
 385 temp_crit_show(struct device *dev, struct device_attribute *attr,
 386                 char *buf)
 387 {
 388         struct thermal_hwmon_attr *hwmon_attr
 389                         = container_of(attr, struct thermal_hwmon_attr, attr);
 390         struct thermal_zone_device *tz
 391                         = container_of(hwmon_attr, struct thermal_zone_device,
 392                                        temp_crit);
 393         long temperature;
 394         int ret;
 395
 396         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 397         if (ret)
 398                 return ret;
 399
 400         return sprintf(buf, "%ld\n", temperature);
 401 }
 402
 403
 404 static int
 405 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 406 {
 407         struct thermal_hwmon_device *hwmon;
 408         int new_hwmon_device = 1;
 409         int result;
 410
 411         mutex_lock(&thermal_list_lock);
 412         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 413                 if (!strcmp(hwmon->type, tz->type)) {
 414                         new_hwmon_device = 0;
 415                         mutex_unlock(&thermal_list_lock);
 416                         goto register_sys_interface;
 417                 }
 418         mutex_unlock(&thermal_list_lock);
 419
 420         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 421         if (!hwmon)
 422                 return -ENOMEM;
 423
 424         INIT_LIST_HEAD(&hwmon->tz_list);
 425         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 426         hwmon->device = hwmon_device_register(NULL);
 427         if (IS_ERR(hwmon->device)) {
 428                 result = PTR_ERR(hwmon->device);
 429                 goto free_mem;
 430         }
 431         hwmon->device->driver_data = hwmon;
 432         result = device_create_file(hwmon->device, &dev_attr_name);
 433         if (result)
 434                 goto unregister_hwmon_device;
 435
 436  register_sys_interface:
 437         tz->hwmon = hwmon;
 438         hwmon->count++;
 439
 440         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
 441                  "temp%d_input", hwmon->count);
 442         tz->temp_input.attr.attr.name = tz->temp_input.name;
 443         tz->temp_input.attr.attr.mode = 0444;
 444         tz->temp_input.attr.show = temp_input_show;
 445         result = device_create_file(hwmon->device, &tz->temp_input.attr);
 446         if (result)
 447                 goto unregister_hwmon_device;
 448
 449         if (tz->ops->get_crit_temp) {
 450                 unsigned long temperature;
 451                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 452                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
 453                                 "temp%d_crit", hwmon->count);
 454                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
 455                         tz->temp_crit.attr.attr.mode = 0444;
 456                         tz->temp_crit.attr.show = temp_crit_show;
 457                         result = device_create_file(hwmon->device,
 458                                                     &tz->temp_crit.attr);
 459                         if (result)
 460                                 goto unregister_hwmon_device;
 461                 }
 462         }
 463
 464         mutex_lock(&thermal_list_lock);
 465         if (new_hwmon_device)
 466                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 467         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
 468         mutex_unlock(&thermal_list_lock);
 469
 470         return 0;
 471
 472  unregister_hwmon_device:
 473         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 474         device_remove_file(hwmon->device, &tz->temp_input.attr);
 475         if (new_hwmon_device) {
 476                 device_remove_file(hwmon->device, &dev_attr_name);
 477                 hwmon_device_unregister(hwmon->device);
 478         }
 479  free_mem:
 480         if (new_hwmon_device)
 481                 kfree(hwmon);
 482
 483         return result;
 484 }
 485
 486 static void
 487 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 488 {
 489         struct thermal_hwmon_device *hwmon = tz->hwmon;
 490
 491         tz->hwmon = NULL;
 492         device_remove_file(hwmon->device, &tz->temp_input.attr);
 493         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 494
 495         mutex_lock(&thermal_list_lock);
 496         list_del(&tz->hwmon_node);
 497         if (!list_empty(&hwmon->tz_list)) {
 498                 mutex_unlock(&thermal_list_lock);
 499                 return;
 500         }
 501         list_del(&hwmon->node);
 502         mutex_unlock(&thermal_list_lock);
 503
 504         device_remove_file(hwmon->device, &dev_attr_name);
 505         hwmon_device_unregister(hwmon->device);
 506         kfree(hwmon);
 507 }
 508 #else
 509 static int
 510 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 511 {
 512         return 0;
 513 }
 514
 515 static void
 516 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 517 {
 518 }
 519 #endif
 520
 521 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 522                                             int delay)
 523 {
 524         cancel_delayed_work(&(tz->poll_queue));
 525
 526         if (!delay)
 527                 return;
 528
 529         if (delay > 1000)
 530                 schedule_delayed_work(&(tz->poll_queue),
 531                                       round_jiffies(msecs_to_jiffies(delay)));
 532         else
 533                 schedule_delayed_work(&(tz->poll_queue),
 534                                       msecs_to_jiffies(delay));
 535 }
 536
 537 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 538                                         int temp, int trip_temp, int trip)
 539 {
 540         int trend = 0;
 541         struct thermal_cooling_device_instance *instance;
 542         struct thermal_cooling_device *cdev;
 543         long state, max_state;
 544
 545         /*
 546          * Above Trip?
 547          * -----------
 548          * Calculate the thermal trend (using the passive cooling equation)
 549          * and modify the performance limit for all passive cooling devices
 550          * accordingly.  Note that we assume symmetry.
 551          */
 552         if (temp >= trip_temp) {
 553                 tz->passive = true;
 554
 555                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 556                         (tz->tc2 * (temp - trip_temp));
 557
 558                 /* Heating up? */
 559                 if (trend > 0) {
 560                         list_for_each_entry(instance, &tz->cooling_devices,
 561                                             node) {
 562                                 if (instance->trip != trip)
 563                                         continue;
 564                                 cdev = instance->cdev;
 565                                 cdev->ops->get_cur_state(cdev, &state);
 566                                 cdev->ops->get_max_state(cdev, &max_state);
 567                                 if (state++ < max_state)
 568                                         cdev->ops->set_cur_state(cdev, state);
 569                         }
 570                 } else if (trend < 0) { /* Cooling off? */
 571                         list_for_each_entry(instance, &tz->cooling_devices,
 572                                             node) {
 573                                 if (instance->trip != trip)
 574                                         continue;
 575                                 cdev = instance->cdev;
 576                                 cdev->ops->get_cur_state(cdev, &state);
 577                                 cdev->ops->get_max_state(cdev, &max_state);
 578                                 if (state > 0)
 579                                         cdev->ops->set_cur_state(cdev, --state);
 580                         }
 581                 }
 582                 return;
 583         }
 584
 585         /*
 586          * Below Trip?
 587          * -----------
 588          * Implement passive cooling hysteresis to slowly increase performance
 589          * and avoid thrashing around the passive trip point.  Note that we
 590          * assume symmetry.
 591          */
 592         list_for_each_entry(instance, &tz->cooling_devices, node) {
 593                 if (instance->trip != trip)
 594                         continue;
 595                 cdev = instance->cdev;
 596                 cdev->ops->get_cur_state(cdev, &state);
 597                 cdev->ops->get_max_state(cdev, &max_state);
 598                 if (state > 0)
 599                         cdev->ops->set_cur_state(cdev, --state);
 600                 if (state == 0)
 601                         tz->passive = false;
 602         }
 603 }
 604
 605 static void thermal_zone_device_check(struct work_struct *work)
 606 {
 607         struct thermal_zone_device *tz = container_of(work, struct
 608                                                       thermal_zone_device,
 609                                                       poll_queue.work);
 610         thermal_zone_device_update(tz);
 611 }
 612
 613 /**
 614  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 615  * @tz:         thermal zone device
 616  * @trip:       indicates which trip point the cooling devices is
 617  *              associated with in this thermal zone.
 618  * @cdev:       thermal cooling device
 619  *
 620  * This function is usually called in the thermal zone device .bind callback.
 621  */
 622 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 623                                      int trip,
 624                                      struct thermal_cooling_device *cdev)
 625 {
 626         struct thermal_cooling_device_instance *dev;
 627         struct thermal_cooling_device_instance *pos;
 628         struct thermal_zone_device *pos1;
 629         struct thermal_cooling_device *pos2;
 630         int result;
 631
 632         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 633                 return -EINVAL;
 634
 635         list_for_each_entry(pos1, &thermal_tz_list, node) {
 636                 if (pos1 == tz)
 637                         break;
 638         }
 639         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 640                 if (pos2 == cdev)
 641                         break;
 642         }
 643
 644         if (tz != pos1 || cdev != pos2)
 645                 return -EINVAL;
 646
 647         dev =
 648             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 649         if (!dev)
 650                 return -ENOMEM;
 651         dev->tz = tz;
 652         dev->cdev = cdev;
 653         dev->trip = trip;
 654         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 655         if (result)
 656                 goto free_mem;
 657
 658         sprintf(dev->name, "cdev%d", dev->id);
 659         result =
 660             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 661         if (result)
 662                 goto release_idr;
 663
 664         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 665         dev->attr.attr.name = dev->attr_name;
 666         dev->attr.attr.mode = 0444;
 667         dev->attr.show = thermal_cooling_device_trip_point_show;
 668         result = device_create_file(&tz->device, &dev->attr);
 669         if (result)
 670                 goto remove_symbol_link;
 671
 672         mutex_lock(&tz->lock);
 673         list_for_each_entry(pos, &tz->cooling_devices, node)
 674             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 675                 result = -EEXIST;
 676                 break;
 677         }
 678         if (!result)
 679                 list_add_tail(&dev->node, &tz->cooling_devices);
 680         mutex_unlock(&tz->lock);
 681
 682         if (!result)
 683                 return 0;
 684
 685         device_remove_file(&tz->device, &dev->attr);
 686       remove_symbol_link:
 687         sysfs_remove_link(&tz->device.kobj, dev->name);
 688       release_idr:
 689         release_idr(&tz->idr, &tz->lock, dev->id);
 690       free_mem:
 691         kfree(dev);
 692         return result;
 693 }
 694
 695 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 696
 697 /**
 698  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 699  * @tz:         thermal zone device
 700  * @trip:       indicates which trip point the cooling devices is
 701  *              associated with in this thermal zone.
 702  * @cdev:       thermal cooling device
 703  *
 704  * This function is usually called in the thermal zone device .unbind callback.
 705  */
 706 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 707                                        int trip,
 708                                        struct thermal_cooling_device *cdev)
 709 {
 710         struct thermal_cooling_device_instance *pos, *next;
 711
 712         mutex_lock(&tz->lock);
 713         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 714                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 715                         list_del(&pos->node);
 716                         mutex_unlock(&tz->lock);
 717                         goto unbind;
 718                 }
 719         }
 720         mutex_unlock(&tz->lock);
 721
 722         return -ENODEV;
 723
 724       unbind:
 725         device_remove_file(&tz->device, &pos->attr);
 726         sysfs_remove_link(&tz->device.kobj, pos->name);
 727         release_idr(&tz->idr, &tz->lock, pos->id);
 728         kfree(pos);
 729         return 0;
 730 }
 731
 732 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 733
 734 static void thermal_release(struct device *dev)
 735 {
 736         struct thermal_zone_device *tz;
 737         struct thermal_cooling_device *cdev;
 738
 739         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 740                 tz = to_thermal_zone(dev);
 741                 kfree(tz);
 742         } else {
 743                 cdev = to_cooling_device(dev);
 744                 kfree(cdev);
 745         }
 746 }
 747
 748 static struct class thermal_class = {
 749         .name = "thermal",
 750         .dev_release = thermal_release,
 751 };
 752
 753 /**
 754  * thermal_cooling_device_register - register a new thermal cooling device
 755  * @type:       the thermal cooling device type.
 756  * @devdata:    device private data.
 757  * @ops:                standard thermal cooling devices callbacks.
 758  */
 759 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 760                                                                void *devdata,
 761                                                                struct
 762                                                                thermal_cooling_device_ops
 763                                                                *ops)
 764 {
 765         struct thermal_cooling_device *cdev;
 766         struct thermal_zone_device *pos;
 767         int result;
 768
 769         if (strlen(type) >= THERMAL_NAME_LENGTH)
 770                 return ERR_PTR(-EINVAL);
 771
 772         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 773             !ops->set_cur_state)
 774                 return ERR_PTR(-EINVAL);
 775
 776         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 777         if (!cdev)
 778                 return ERR_PTR(-ENOMEM);
 779
 780         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 781         if (result) {
 782                 kfree(cdev);
 783                 return ERR_PTR(result);
 784         }
 785
 786         strcpy(cdev->type, type);
 787         cdev->ops = ops;
 788         cdev->device.class = &thermal_class;
 789         cdev->devdata = devdata;
 790         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 791         result = device_register(&cdev->device);
 792         if (result) {
 793                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 794                 kfree(cdev);
 795                 return ERR_PTR(result);
 796         }
 797
 798         /* sys I/F */
 799         if (type) {
 800                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 801                 if (result)
 802                         goto unregister;
 803         }
 804
 805         result = device_create_file(&cdev->device, &dev_attr_max_state);
 806         if (result)
 807                 goto unregister;
 808
 809         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 810         if (result)
 811                 goto unregister;
 812
 813         mutex_lock(&thermal_list_lock);
 814         list_add(&cdev->node, &thermal_cdev_list);
 815         list_for_each_entry(pos, &thermal_tz_list, node) {
 816                 if (!pos->ops->bind)
 817                         continue;
 818                 result = pos->ops->bind(pos, cdev);
 819                 if (result)
 820                         break;
 821
 822         }
 823         mutex_unlock(&thermal_list_lock);
 824
 825         if (!result)
 826                 return cdev;
 827
 828       unregister:
 829         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 830         device_unregister(&cdev->device);
 831         return ERR_PTR(result);
 832 }
 833
 834 EXPORT_SYMBOL(thermal_cooling_device_register);
 835
 836 /**
 837  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 838  * @cdev:       the thermal cooling device to remove.
 839  *
 840  * thermal_cooling_device_unregister() must be called when the device is no
 841  * longer needed.
 842  */
 843 void thermal_cooling_device_unregister(struct
 844                                        thermal_cooling_device
 845                                        *cdev)
 846 {
 847         struct thermal_zone_device *tz;
 848         struct thermal_cooling_device *pos = NULL;
 849
 850         if (!cdev)
 851                 return;
 852
 853         mutex_lock(&thermal_list_lock);
 854         list_for_each_entry(pos, &thermal_cdev_list, node)
 855             if (pos == cdev)
 856                 break;
 857         if (pos != cdev) {
 858                 /* thermal cooling device not found */
 859                 mutex_unlock(&thermal_list_lock);
 860                 return;
 861         }
 862         list_del(&cdev->node);
 863         list_for_each_entry(tz, &thermal_tz_list, node) {
 864                 if (!tz->ops->unbind)
 865                         continue;
 866                 tz->ops->unbind(tz, cdev);
 867         }
 868         mutex_unlock(&thermal_list_lock);
 869         if (cdev->type[0])
 870                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 871         device_remove_file(&cdev->device, &dev_attr_max_state);
 872         device_remove_file(&cdev->device, &dev_attr_cur_state);
 873
 874         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 875         device_unregister(&cdev->device);
 876         return;
 877 }
 878
 879 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 880
 881 /**
 882  * thermal_zone_device_update - force an update of a thermal zone's state
 883  * @ttz:        the thermal zone to update
 884  */
 885
 886 void thermal_zone_device_update(struct thermal_zone_device *tz)
 887 {
 888         int count, ret = 0;
 889         long temp, trip_temp;
 890         enum thermal_trip_type trip_type;
 891         struct thermal_cooling_device_instance *instance;
 892         struct thermal_cooling_device *cdev;
 893
 894         mutex_lock(&tz->lock);
 895
 896         tz->ops->get_temp(tz, &temp);
 897
 898         for (count = 0; count < tz->trips; count++) {
 899                 tz->ops->get_trip_type(tz, count, &trip_type);
 900                 tz->ops->get_trip_temp(tz, count, &trip_temp);
 901
 902                 switch (trip_type) {
 903                 case THERMAL_TRIP_CRITICAL:
 904                         if (temp > trip_temp) {
 905                                 if (tz->ops->notify)
 906                                         ret = tz->ops->notify(tz, count,
 907                                                               trip_type);
 908                                 if (!ret) {
 909                                         printk(KERN_EMERG
 910                                                "Critical temperature reached (%ld C), shutting down.\n",
 911                                                temp/1000);
 912                                         orderly_poweroff(true);
 913                                 }
 914                         }
 915                         break;
 916                 case THERMAL_TRIP_HOT:
 917                         if (temp > trip_temp)
 918                                 if (tz->ops->notify)
 919                                         tz->ops->notify(tz, count, trip_type);
 920                         break;
 921                 case THERMAL_TRIP_ACTIVE:
 922                         list_for_each_entry(instance, &tz->cooling_devices,
 923                                             node) {
 924                                 if (instance->trip != count)
 925                                         continue;
 926
 927                                 cdev = instance->cdev;
 928
 929                                 if (temp > trip_temp)
 930                                         cdev->ops->set_cur_state(cdev, 1);
 931                                 else
 932                                         cdev->ops->set_cur_state(cdev, 0);
 933                         }
 934                         break;
 935                 case THERMAL_TRIP_PASSIVE:
 936                         if (temp > trip_temp || tz->passive)
 937                                 thermal_zone_device_passive(tz, temp,
 938                                                             trip_temp, count);
 939                         break;
 940                 }
 941         }
 942         tz->last_temperature = temp;
 943         if (tz->passive)
 944                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 945         else if (tz->polling_delay)
 946                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 947         mutex_unlock(&tz->lock);
 948 }
 949 EXPORT_SYMBOL(thermal_zone_device_update);
 950
 951 /**
 952  * thermal_zone_device_register - register a new thermal zone device
 953  * @type:       the thermal zone device type
 954  * @trips:      the number of trip points the thermal zone support
 955  * @devdata:    private device data
 956  * @ops:        standard thermal zone device callbacks
 957  * @tc1:        thermal coefficient 1 for passive calculations
 958  * @tc2:        thermal coefficient 2 for passive calculations
 959  * @passive_delay: number of milliseconds to wait between polls when
 960  *                 performing passive cooling
 961  * @polling_delay: number of milliseconds to wait between polls when checking
 962  *                 whether trip points have been crossed (0 for interrupt
 963  *                 driven systems)
 964  *
 965  * thermal_zone_device_unregister() must be called when the device is no
 966  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
 967  * section 11.1.5.1 of the ACPI specification 3.0.
 968  */
 969 struct thermal_zone_device *thermal_zone_device_register(char *type,
 970                                                          int trips,
 971                                                          void *devdata, struct
 972                                                          thermal_zone_device_ops
 973                                                          *ops, int tc1, int
 974                                                          tc2,
 975                                                          int passive_delay,
 976                                                          int polling_delay)
 977 {
 978         struct thermal_zone_device *tz;
 979         struct thermal_cooling_device *pos;
 980         int result;
 981         int count;
 982
 983         if (strlen(type) >= THERMAL_NAME_LENGTH)
 984                 return ERR_PTR(-EINVAL);
 985
 986         if (trips > THERMAL_MAX_TRIPS || trips < 0)
 987                 return ERR_PTR(-EINVAL);
 988
 989         if (!ops || !ops->get_temp)
 990                 return ERR_PTR(-EINVAL);
 991
 992         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
 993         if (!tz)
 994                 return ERR_PTR(-ENOMEM);
 995
 996         INIT_LIST_HEAD(&tz->cooling_devices);
 997         idr_init(&tz->idr);
 998         mutex_init(&tz->lock);
 999         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1000         if (result) {
1001                 kfree(tz);
1002                 return ERR_PTR(result);
1003         }
1004
1005         strcpy(tz->type, type);
1006         tz->ops = ops;
1007         tz->device.class = &thermal_class;
1008         tz->devdata = devdata;
1009         tz->trips = trips;
1010         tz->tc1 = tc1;
1011         tz->tc2 = tc2;
1012         tz->passive_delay = passive_delay;
1013         tz->polling_delay = polling_delay;
1014
1015         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1016         result = device_register(&tz->device);
1017         if (result) {
1018                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1019                 kfree(tz);
1020                 return ERR_PTR(result);
1021         }
1022
1023         /* sys I/F */
1024         if (type) {
1025                 result = device_create_file(&tz->device, &dev_attr_type);
1026                 if (result)
1027                         goto unregister;
1028         }
1029
1030         result = device_create_file(&tz->device, &dev_attr_temp);
1031         if (result)
1032                 goto unregister;
1033
1034         if (ops->get_mode) {
1035                 result = device_create_file(&tz->device, &dev_attr_mode);
1036                 if (result)
1037                         goto unregister;
1038         }
1039
1040         for (count = 0; count < trips; count++) {
1041                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1042                 if (result)
1043                         goto unregister;
1044         }
1045
1046         result = thermal_add_hwmon_sysfs(tz);
1047         if (result)
1048                 goto unregister;
1049
1050         mutex_lock(&thermal_list_lock);
1051         list_add_tail(&tz->node, &thermal_tz_list);
1052         if (ops->bind)
1053                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1054                 result = ops->bind(tz, pos);
1055                 if (result)
1056                         break;
1057                 }
1058         mutex_unlock(&thermal_list_lock);
1059
1060         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1061
1062         thermal_zone_device_update(tz);
1063
1064         if (!result)
1065                 return tz;
1066
1067       unregister:
1068         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1069         device_unregister(&tz->device);
1070         return ERR_PTR(result);
1071 }
1072
1073 EXPORT_SYMBOL(thermal_zone_device_register);
1074
1075 /**
1076  * thermal_device_unregister - removes the registered thermal zone device
1077  * @tz: the thermal zone device to remove
1078  */
1079 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1080 {
1081         struct thermal_cooling_device *cdev;
1082         struct thermal_zone_device *pos = NULL;
1083         int count;
1084
1085         if (!tz)
1086                 return;
1087
1088         mutex_lock(&thermal_list_lock);
1089         list_for_each_entry(pos, &thermal_tz_list, node)
1090             if (pos == tz)
1091                 break;
1092         if (pos != tz) {
1093                 /* thermal zone device not found */
1094                 mutex_unlock(&thermal_list_lock);
1095                 return;
1096         }
1097         list_del(&tz->node);
1098         if (tz->ops->unbind)
1099                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1100                     tz->ops->unbind(tz, cdev);
1101         mutex_unlock(&thermal_list_lock);
1102
1103         thermal_zone_device_set_polling(tz, 0);
1104
1105         if (tz->type[0])
1106                 device_remove_file(&tz->device, &dev_attr_type);
1107         device_remove_file(&tz->device, &dev_attr_temp);
1108         if (tz->ops->get_mode)
1109                 device_remove_file(&tz->device, &dev_attr_mode);
1110
1111         for (count = 0; count < tz->trips; count++)
1112                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1113
1114         thermal_remove_hwmon_sysfs(tz);
1115         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1116         idr_destroy(&tz->idr);
1117         mutex_destroy(&tz->lock);
1118         device_unregister(&tz->device);
1119         return;
1120 }
1121
1122 EXPORT_SYMBOL(thermal_zone_device_unregister);
1123
1124 static int __init thermal_init(void)
1125 {
1126         int result = 0;
1127
1128         result = class_register(&thermal_class);
1129         if (result) {
1130                 idr_destroy(&thermal_tz_idr);
1131                 idr_destroy(&thermal_cdev_idr);
1132                 mutex_destroy(&thermal_idr_lock);
1133                 mutex_destroy(&thermal_list_lock);
1134         }
1135         return result;
1136 }
1137
1138 static void __exit thermal_exit(void)
1139 {
1140         class_unregister(&thermal_class);
1141         idr_destroy(&thermal_tz_idr);
1142         idr_destroy(&thermal_cdev_idr);
1143         mutex_destroy(&thermal_idr_lock);
1144         mutex_destroy(&thermal_list_lock);
1145 }
1146
1147 subsys_initcall(thermal_init);
1148 module_exit(thermal_exit);