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/slab.h>
  30 #include <linux/kdev_t.h>
  31 #include <linux/idr.h>
  32 #include <linux/thermal.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/reboot.h>
  35
  36 MODULE_AUTHOR("Zhang Rui");
  37 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  38 MODULE_LICENSE("GPL");
  39
  40 #define PREFIX "Thermal: "
  41
  42 struct thermal_cooling_device_instance {
  43         int id;
  44         char name[THERMAL_NAME_LENGTH];
  45         struct thermal_zone_device *tz;
  46         struct thermal_cooling_device *cdev;
  47         int trip;
  48         char attr_name[THERMAL_NAME_LENGTH];
  49         struct device_attribute attr;
  50         struct list_head node;
  51 };
  52
  53 static DEFINE_IDR(thermal_tz_idr);
  54 static DEFINE_IDR(thermal_cdev_idr);
  55 static DEFINE_MUTEX(thermal_idr_lock);
  56
  57 static LIST_HEAD(thermal_tz_list);
  58 static LIST_HEAD(thermal_cdev_list);
  59 static DEFINE_MUTEX(thermal_list_lock);
  60
  61 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  62 {
  63         int err;
  64
  65       again:
  66         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  67                 return -ENOMEM;
  68
  69         if (lock)
  70                 mutex_lock(lock);
  71         err = idr_get_new(idr, NULL, id);
  72         if (lock)
  73                 mutex_unlock(lock);
  74         if (unlikely(err == -EAGAIN))
  75                 goto again;
  76         else if (unlikely(err))
  77                 return err;
  78
  79         *id = *id & MAX_ID_MASK;
  80         return 0;
  81 }
  82
  83 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  84 {
  85         if (lock)
  86                 mutex_lock(lock);
  87         idr_remove(idr, id);
  88         if (lock)
  89                 mutex_unlock(lock);
  90 }
  91
  92 /* sys I/F for thermal zone */
  93
  94 #define to_thermal_zone(_dev) \
  95         container_of(_dev, struct thermal_zone_device, device)
  96
  97 static ssize_t
  98 type_show(struct device *dev, struct device_attribute *attr, char *buf)
  99 {
 100         struct thermal_zone_device *tz = to_thermal_zone(dev);
 101
 102         return sprintf(buf, "%s\n", tz->type);
 103 }
 104
 105 static ssize_t
 106 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 107 {
 108         struct thermal_zone_device *tz = to_thermal_zone(dev);
 109         long temperature;
 110         int ret;
 111
 112         if (!tz->ops->get_temp)
 113                 return -EPERM;
 114
 115         ret = tz->ops->get_temp(tz, &temperature);
 116
 117         if (ret)
 118                 return ret;
 119
 120         return sprintf(buf, "%ld\n", temperature);
 121 }
 122
 123 static ssize_t
 124 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 125 {
 126         struct thermal_zone_device *tz = to_thermal_zone(dev);
 127         enum thermal_device_mode mode;
 128         int result;
 129
 130         if (!tz->ops->get_mode)
 131                 return -EPERM;
 132
 133         result = tz->ops->get_mode(tz, &mode);
 134         if (result)
 135                 return result;
 136
 137         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 138                        : "disabled");
 139 }
 140
 141 static ssize_t
 142 mode_store(struct device *dev, struct device_attribute *attr,
 143            const char *buf, size_t count)
 144 {
 145         struct thermal_zone_device *tz = to_thermal_zone(dev);
 146         int result;
 147
 148         if (!tz->ops->set_mode)
 149                 return -EPERM;
 150
 151         if (!strncmp(buf, "enabled", sizeof("enabled")))
 152                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 153         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 154                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 155         else
 156                 result = -EINVAL;
 157
 158         if (result)
 159                 return result;
 160
 161         return count;
 162 }
 163
 164 static ssize_t
 165 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 166                      char *buf)
 167 {
 168         struct thermal_zone_device *tz = to_thermal_zone(dev);
 169         enum thermal_trip_type type;
 170         int trip, result;
 171
 172         if (!tz->ops->get_trip_type)
 173                 return -EPERM;
 174
 175         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 176                 return -EINVAL;
 177
 178         result = tz->ops->get_trip_type(tz, trip, &type);
 179         if (result)
 180                 return result;
 181
 182         switch (type) {
 183         case THERMAL_TRIP_CRITICAL:
 184                 return sprintf(buf, "critical\n");
 185         case THERMAL_TRIP_HOT:
 186                 return sprintf(buf, "hot\n");
 187         case THERMAL_TRIP_PASSIVE:
 188                 return sprintf(buf, "passive\n");
 189         case THERMAL_TRIP_ACTIVE:
 190                 return sprintf(buf, "active\n");
 191         default:
 192                 return sprintf(buf, "unknown\n");
 193         }
 194 }
 195
 196 static ssize_t
 197 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 198                      char *buf)
 199 {
 200         struct thermal_zone_device *tz = to_thermal_zone(dev);
 201         int trip, ret;
 202         long temperature;
 203
 204         if (!tz->ops->get_trip_temp)
 205                 return -EPERM;
 206
 207         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 208                 return -EINVAL;
 209
 210         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 211
 212         if (ret)
 213                 return ret;
 214
 215         return sprintf(buf, "%ld\n", temperature);
 216 }
 217
 218 static ssize_t
 219 passive_store(struct device *dev, struct device_attribute *attr,
 220                     const char *buf, size_t count)
 221 {
 222         struct thermal_zone_device *tz = to_thermal_zone(dev);
 223         struct thermal_cooling_device *cdev = NULL;
 224         int state;
 225
 226         if (!sscanf(buf, "%d\n", &state))
 227                 return -EINVAL;
 228
 229         /* sanity check: values below 1000 millicelcius don't make sense
 230          * and can cause the system to go into a thermal heart attack
 231          */
 232         if (state && state < 1000)
 233                 return -EINVAL;
 234
 235         if (state && !tz->forced_passive) {
 236                 mutex_lock(&thermal_list_lock);
 237                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 238                         if (!strncmp("Processor", cdev->type,
 239                                      sizeof("Processor")))
 240                                 thermal_zone_bind_cooling_device(tz,
 241                                                                  THERMAL_TRIPS_NONE,
 242                                                                  cdev);
 243                 }
 244                 mutex_unlock(&thermal_list_lock);
 245                 if (!tz->passive_delay)
 246                         tz->passive_delay = 1000;
 247         } else if (!state && tz->forced_passive) {
 248                 mutex_lock(&thermal_list_lock);
 249                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 250                         if (!strncmp("Processor", cdev->type,
 251                                      sizeof("Processor")))
 252                                 thermal_zone_unbind_cooling_device(tz,
 253                                                                    THERMAL_TRIPS_NONE,
 254                                                                    cdev);
 255                 }
 256                 mutex_unlock(&thermal_list_lock);
 257                 tz->passive_delay = 0;
 258         }
 259
 260         tz->tc1 = 1;
 261         tz->tc2 = 1;
 262
 263         tz->forced_passive = state;
 264
 265         thermal_zone_device_update(tz);
 266
 267         return count;
 268 }
 269
 270 static ssize_t
 271 passive_show(struct device *dev, struct device_attribute *attr,
 272                    char *buf)
 273 {
 274         struct thermal_zone_device *tz = to_thermal_zone(dev);
 275
 276         return sprintf(buf, "%d\n", tz->forced_passive);
 277 }
 278
 279 static DEVICE_ATTR(type, 0444, type_show, NULL);
 280 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 281 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 282 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
 283                    passive_store);
 284
 285 static struct device_attribute trip_point_attrs[] = {
 286         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 287         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 288         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 289         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 290         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 291         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 292         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 293         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 294         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 295         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 296         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 297         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 298         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 299         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 300         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 301         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 302         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 303         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 304         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 305         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 306         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 307         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 308         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 309         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 310 };
 311
 312 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 313 do {    \
 314         result = device_create_file(_dev,       \
 315                                 &trip_point_attrs[_index * 2]); \
 316         if (result)     \
 317                 break;  \
 318         result = device_create_file(_dev,       \
 319                         &trip_point_attrs[_index * 2 + 1]);     \
 320 } while (0)
 321
 322 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 323 do {    \
 324         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 325         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 326 } while (0)
 327
 328 /* sys I/F for cooling device */
 329 #define to_cooling_device(_dev) \
 330         container_of(_dev, struct thermal_cooling_device, device)
 331
 332 static ssize_t
 333 thermal_cooling_device_type_show(struct device *dev,
 334                                  struct device_attribute *attr, char *buf)
 335 {
 336         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 337
 338         return sprintf(buf, "%s\n", cdev->type);
 339 }
 340
 341 static ssize_t
 342 thermal_cooling_device_max_state_show(struct device *dev,
 343                                       struct device_attribute *attr, char *buf)
 344 {
 345         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 346         unsigned long state;
 347         int ret;
 348
 349         ret = cdev->ops->get_max_state(cdev, &state);
 350         if (ret)
 351                 return ret;
 352         return sprintf(buf, "%ld\n", state);
 353 }
 354
 355 static ssize_t
 356 thermal_cooling_device_cur_state_show(struct device *dev,
 357                                       struct device_attribute *attr, char *buf)
 358 {
 359         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 360         unsigned long state;
 361         int ret;
 362
 363         ret = cdev->ops->get_cur_state(cdev, &state);
 364         if (ret)
 365                 return ret;
 366         return sprintf(buf, "%ld\n", state);
 367 }
 368
 369 static ssize_t
 370 thermal_cooling_device_cur_state_store(struct device *dev,
 371                                        struct device_attribute *attr,
 372                                        const char *buf, size_t count)
 373 {
 374         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 375         unsigned long state;
 376         int result;
 377
 378         if (!sscanf(buf, "%ld\n", &state))
 379                 return -EINVAL;
 380
 381         if ((long)state < 0)
 382                 return -EINVAL;
 383
 384         result = cdev->ops->set_cur_state(cdev, state);
 385         if (result)
 386                 return result;
 387         return count;
 388 }
 389
 390 static struct device_attribute dev_attr_cdev_type =
 391 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 392 static DEVICE_ATTR(max_state, 0444,
 393                    thermal_cooling_device_max_state_show, NULL);
 394 static DEVICE_ATTR(cur_state, 0644,
 395                    thermal_cooling_device_cur_state_show,
 396                    thermal_cooling_device_cur_state_store);
 397
 398 static ssize_t
 399 thermal_cooling_device_trip_point_show(struct device *dev,
 400                                        struct device_attribute *attr, char *buf)
 401 {
 402         struct thermal_cooling_device_instance *instance;
 403
 404         instance =
 405             container_of(attr, struct thermal_cooling_device_instance, attr);
 406
 407         if (instance->trip == THERMAL_TRIPS_NONE)
 408                 return sprintf(buf, "-1\n");
 409         else
 410                 return sprintf(buf, "%d\n", instance->trip);
 411 }
 412
 413 /* Device management */
 414
 415 #if defined(CONFIG_THERMAL_HWMON)
 416
 417 /* hwmon sys I/F */
 418 #include <linux/hwmon.h>
 419 static LIST_HEAD(thermal_hwmon_list);
 420
 421 static ssize_t
 422 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 423 {
 424         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 425         return sprintf(buf, "%s\n", hwmon->type);
 426 }
 427 static DEVICE_ATTR(name, 0444, name_show, NULL);
 428
 429 static ssize_t
 430 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 431 {
 432         long temperature;
 433         int ret;
 434         struct thermal_hwmon_attr *hwmon_attr
 435                         = container_of(attr, struct thermal_hwmon_attr, attr);
 436         struct thermal_zone_device *tz
 437                         = container_of(hwmon_attr, struct thermal_zone_device,
 438                                        temp_input);
 439
 440         ret = tz->ops->get_temp(tz, &temperature);
 441
 442         if (ret)
 443                 return ret;
 444
 445         return sprintf(buf, "%ld\n", temperature);
 446 }
 447
 448 static ssize_t
 449 temp_crit_show(struct device *dev, struct device_attribute *attr,
 450                 char *buf)
 451 {
 452         struct thermal_hwmon_attr *hwmon_attr
 453                         = container_of(attr, struct thermal_hwmon_attr, attr);
 454         struct thermal_zone_device *tz
 455                         = container_of(hwmon_attr, struct thermal_zone_device,
 456                                        temp_crit);
 457         long temperature;
 458         int ret;
 459
 460         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 461         if (ret)
 462                 return ret;
 463
 464         return sprintf(buf, "%ld\n", temperature);
 465 }
 466
 467
 468 static int
 469 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 470 {
 471         struct thermal_hwmon_device *hwmon;
 472         int new_hwmon_device = 1;
 473         int result;
 474
 475         mutex_lock(&thermal_list_lock);
 476         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 477                 if (!strcmp(hwmon->type, tz->type)) {
 478                         new_hwmon_device = 0;
 479                         mutex_unlock(&thermal_list_lock);
 480                         goto register_sys_interface;
 481                 }
 482         mutex_unlock(&thermal_list_lock);
 483
 484         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 485         if (!hwmon)
 486                 return -ENOMEM;
 487
 488         INIT_LIST_HEAD(&hwmon->tz_list);
 489         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 490         hwmon->device = hwmon_device_register(NULL);
 491         if (IS_ERR(hwmon->device)) {
 492                 result = PTR_ERR(hwmon->device);
 493                 goto free_mem;
 494         }
 495         dev_set_drvdata(hwmon->device, hwmon);
 496         result = device_create_file(hwmon->device, &dev_attr_name);
 497         if (result)
 498                 goto unregister_hwmon_device;
 499
 500  register_sys_interface:
 501         tz->hwmon = hwmon;
 502         hwmon->count++;
 503
 504         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
 505                  "temp%d_input", hwmon->count);
 506         tz->temp_input.attr.attr.name = tz->temp_input.name;
 507         tz->temp_input.attr.attr.mode = 0444;
 508         tz->temp_input.attr.show = temp_input_show;
 509         sysfs_attr_init(&tz->temp_input.attr.attr);
 510         result = device_create_file(hwmon->device, &tz->temp_input.attr);
 511         if (result)
 512                 goto unregister_hwmon_device;
 513
 514         if (tz->ops->get_crit_temp) {
 515                 unsigned long temperature;
 516                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 517                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
 518                                 "temp%d_crit", hwmon->count);
 519                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
 520                         tz->temp_crit.attr.attr.mode = 0444;
 521                         tz->temp_crit.attr.show = temp_crit_show;
 522                         sysfs_attr_init(&tz->temp_crit.attr.attr);
 523                         result = device_create_file(hwmon->device,
 524                                                     &tz->temp_crit.attr);
 525                         if (result)
 526                                 goto unregister_hwmon_device;
 527                 }
 528         }
 529
 530         mutex_lock(&thermal_list_lock);
 531         if (new_hwmon_device)
 532                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 533         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
 534         mutex_unlock(&thermal_list_lock);
 535
 536         return 0;
 537
 538  unregister_hwmon_device:
 539         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 540         device_remove_file(hwmon->device, &tz->temp_input.attr);
 541         if (new_hwmon_device) {
 542                 device_remove_file(hwmon->device, &dev_attr_name);
 543                 hwmon_device_unregister(hwmon->device);
 544         }
 545  free_mem:
 546         if (new_hwmon_device)
 547                 kfree(hwmon);
 548
 549         return result;
 550 }
 551
 552 static void
 553 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 554 {
 555         struct thermal_hwmon_device *hwmon = tz->hwmon;
 556
 557         tz->hwmon = NULL;
 558         device_remove_file(hwmon->device, &tz->temp_input.attr);
 559         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 560
 561         mutex_lock(&thermal_list_lock);
 562         list_del(&tz->hwmon_node);
 563         if (!list_empty(&hwmon->tz_list)) {
 564                 mutex_unlock(&thermal_list_lock);
 565                 return;
 566         }
 567         list_del(&hwmon->node);
 568         mutex_unlock(&thermal_list_lock);
 569
 570         device_remove_file(hwmon->device, &dev_attr_name);
 571         hwmon_device_unregister(hwmon->device);
 572         kfree(hwmon);
 573 }
 574 #else
 575 static int
 576 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 577 {
 578         return 0;
 579 }
 580
 581 static void
 582 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 583 {
 584 }
 585 #endif
 586
 587 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 588                                             int delay)
 589 {
 590         cancel_delayed_work(&(tz->poll_queue));
 591
 592         if (!delay)
 593                 return;
 594
 595         if (delay > 1000)
 596                 schedule_delayed_work(&(tz->poll_queue),
 597                                       round_jiffies(msecs_to_jiffies(delay)));
 598         else
 599                 schedule_delayed_work(&(tz->poll_queue),
 600                                       msecs_to_jiffies(delay));
 601 }
 602
 603 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
 604                                         int temp, int trip_temp, int trip)
 605 {
 606         int trend = 0;
 607         struct thermal_cooling_device_instance *instance;
 608         struct thermal_cooling_device *cdev;
 609         long state, max_state;
 610
 611         /*
 612          * Above Trip?
 613          * -----------
 614          * Calculate the thermal trend (using the passive cooling equation)
 615          * and modify the performance limit for all passive cooling devices
 616          * accordingly.  Note that we assume symmetry.
 617          */
 618         if (temp >= trip_temp) {
 619                 tz->passive = true;
 620
 621                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
 622                         (tz->tc2 * (temp - trip_temp));
 623
 624                 /* Heating up? */
 625                 if (trend > 0) {
 626                         list_for_each_entry(instance, &tz->cooling_devices,
 627                                             node) {
 628                                 if (instance->trip != trip)
 629                                         continue;
 630                                 cdev = instance->cdev;
 631                                 cdev->ops->get_cur_state(cdev, &state);
 632                                 cdev->ops->get_max_state(cdev, &max_state);
 633                                 if (state++ < max_state)
 634                                         cdev->ops->set_cur_state(cdev, state);
 635                         }
 636                 } else if (trend < 0) { /* Cooling off? */
 637                         list_for_each_entry(instance, &tz->cooling_devices,
 638                                             node) {
 639                                 if (instance->trip != trip)
 640                                         continue;
 641                                 cdev = instance->cdev;
 642                                 cdev->ops->get_cur_state(cdev, &state);
 643                                 cdev->ops->get_max_state(cdev, &max_state);
 644                                 if (state > 0)
 645                                         cdev->ops->set_cur_state(cdev, --state);
 646                         }
 647                 }
 648                 return;
 649         }
 650
 651         /*
 652          * Below Trip?
 653          * -----------
 654          * Implement passive cooling hysteresis to slowly increase performance
 655          * and avoid thrashing around the passive trip point.  Note that we
 656          * assume symmetry.
 657          */
 658         list_for_each_entry(instance, &tz->cooling_devices, node) {
 659                 if (instance->trip != trip)
 660                         continue;
 661                 cdev = instance->cdev;
 662                 cdev->ops->get_cur_state(cdev, &state);
 663                 cdev->ops->get_max_state(cdev, &max_state);
 664                 if (state > 0)
 665                         cdev->ops->set_cur_state(cdev, --state);
 666                 if (state == 0)
 667                         tz->passive = false;
 668         }
 669 }
 670
 671 static void thermal_zone_device_check(struct work_struct *work)
 672 {
 673         struct thermal_zone_device *tz = container_of(work, struct
 674                                                       thermal_zone_device,
 675                                                       poll_queue.work);
 676         thermal_zone_device_update(tz);
 677 }
 678
 679 /**
 680  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 681  * @tz:         thermal zone device
 682  * @trip:       indicates which trip point the cooling devices is
 683  *              associated with in this thermal zone.
 684  * @cdev:       thermal cooling device
 685  *
 686  * This function is usually called in the thermal zone device .bind callback.
 687  */
 688 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 689                                      int trip,
 690                                      struct thermal_cooling_device *cdev)
 691 {
 692         struct thermal_cooling_device_instance *dev;
 693         struct thermal_cooling_device_instance *pos;
 694         struct thermal_zone_device *pos1;
 695         struct thermal_cooling_device *pos2;
 696         int result;
 697
 698         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 699                 return -EINVAL;
 700
 701         list_for_each_entry(pos1, &thermal_tz_list, node) {
 702                 if (pos1 == tz)
 703                         break;
 704         }
 705         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 706                 if (pos2 == cdev)
 707                         break;
 708         }
 709
 710         if (tz != pos1 || cdev != pos2)
 711                 return -EINVAL;
 712
 713         dev =
 714             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 715         if (!dev)
 716                 return -ENOMEM;
 717         dev->tz = tz;
 718         dev->cdev = cdev;
 719         dev->trip = trip;
 720         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 721         if (result)
 722                 goto free_mem;
 723
 724         sprintf(dev->name, "cdev%d", dev->id);
 725         result =
 726             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 727         if (result)
 728                 goto release_idr;
 729
 730         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 731         sysfs_attr_init(&dev->attr.attr);
 732         dev->attr.attr.name = dev->attr_name;
 733         dev->attr.attr.mode = 0444;
 734         dev->attr.show = thermal_cooling_device_trip_point_show;
 735         result = device_create_file(&tz->device, &dev->attr);
 736         if (result)
 737                 goto remove_symbol_link;
 738
 739         mutex_lock(&tz->lock);
 740         list_for_each_entry(pos, &tz->cooling_devices, node)
 741             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 742                 result = -EEXIST;
 743                 break;
 744         }
 745         if (!result)
 746                 list_add_tail(&dev->node, &tz->cooling_devices);
 747         mutex_unlock(&tz->lock);
 748
 749         if (!result)
 750                 return 0;
 751
 752         device_remove_file(&tz->device, &dev->attr);
 753       remove_symbol_link:
 754         sysfs_remove_link(&tz->device.kobj, dev->name);
 755       release_idr:
 756         release_idr(&tz->idr, &tz->lock, dev->id);
 757       free_mem:
 758         kfree(dev);
 759         return result;
 760 }
 761
 762 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 763
 764 /**
 765  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 766  * @tz:         thermal zone device
 767  * @trip:       indicates which trip point the cooling devices is
 768  *              associated with in this thermal zone.
 769  * @cdev:       thermal cooling device
 770  *
 771  * This function is usually called in the thermal zone device .unbind callback.
 772  */
 773 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 774                                        int trip,
 775                                        struct thermal_cooling_device *cdev)
 776 {
 777         struct thermal_cooling_device_instance *pos, *next;
 778
 779         mutex_lock(&tz->lock);
 780         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 781                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 782                         list_del(&pos->node);
 783                         mutex_unlock(&tz->lock);
 784                         goto unbind;
 785                 }
 786         }
 787         mutex_unlock(&tz->lock);
 788
 789         return -ENODEV;
 790
 791       unbind:
 792         device_remove_file(&tz->device, &pos->attr);
 793         sysfs_remove_link(&tz->device.kobj, pos->name);
 794         release_idr(&tz->idr, &tz->lock, pos->id);
 795         kfree(pos);
 796         return 0;
 797 }
 798
 799 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 800
 801 static void thermal_release(struct device *dev)
 802 {
 803         struct thermal_zone_device *tz;
 804         struct thermal_cooling_device *cdev;
 805
 806         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 807                 tz = to_thermal_zone(dev);
 808                 kfree(tz);
 809         } else {
 810                 cdev = to_cooling_device(dev);
 811                 kfree(cdev);
 812         }
 813 }
 814
 815 static struct class thermal_class = {
 816         .name = "thermal",
 817         .dev_release = thermal_release,
 818 };
 819
 820 /**
 821  * thermal_cooling_device_register - register a new thermal cooling device
 822  * @type:       the thermal cooling device type.
 823  * @devdata:    device private data.
 824  * @ops:                standard thermal cooling devices callbacks.
 825  */
 826 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 827                                                                void *devdata,
 828                                                                struct
 829                                                                thermal_cooling_device_ops
 830                                                                *ops)
 831 {
 832         struct thermal_cooling_device *cdev;
 833         struct thermal_zone_device *pos;
 834         int result;
 835
 836         if (strlen(type) >= THERMAL_NAME_LENGTH)
 837                 return ERR_PTR(-EINVAL);
 838
 839         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 840             !ops->set_cur_state)
 841                 return ERR_PTR(-EINVAL);
 842
 843         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 844         if (!cdev)
 845                 return ERR_PTR(-ENOMEM);
 846
 847         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 848         if (result) {
 849                 kfree(cdev);
 850                 return ERR_PTR(result);
 851         }
 852
 853         strcpy(cdev->type, type);
 854         cdev->ops = ops;
 855         cdev->device.class = &thermal_class;
 856         cdev->devdata = devdata;
 857         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 858         result = device_register(&cdev->device);
 859         if (result) {
 860                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 861                 kfree(cdev);
 862                 return ERR_PTR(result);
 863         }
 864
 865         /* sys I/F */
 866         if (type) {
 867                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 868                 if (result)
 869                         goto unregister;
 870         }
 871
 872         result = device_create_file(&cdev->device, &dev_attr_max_state);
 873         if (result)
 874                 goto unregister;
 875
 876         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 877         if (result)
 878                 goto unregister;
 879
 880         mutex_lock(&thermal_list_lock);
 881         list_add(&cdev->node, &thermal_cdev_list);
 882         list_for_each_entry(pos, &thermal_tz_list, node) {
 883                 if (!pos->ops->bind)
 884                         continue;
 885                 result = pos->ops->bind(pos, cdev);
 886                 if (result)
 887                         break;
 888
 889         }
 890         mutex_unlock(&thermal_list_lock);
 891
 892         if (!result)
 893                 return cdev;
 894
 895       unregister:
 896         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 897         device_unregister(&cdev->device);
 898         return ERR_PTR(result);
 899 }
 900
 901 EXPORT_SYMBOL(thermal_cooling_device_register);
 902
 903 /**
 904  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 905  * @cdev:       the thermal cooling device to remove.
 906  *
 907  * thermal_cooling_device_unregister() must be called when the device is no
 908  * longer needed.
 909  */
 910 void thermal_cooling_device_unregister(struct
 911                                        thermal_cooling_device
 912                                        *cdev)
 913 {
 914         struct thermal_zone_device *tz;
 915         struct thermal_cooling_device *pos = NULL;
 916
 917         if (!cdev)
 918                 return;
 919
 920         mutex_lock(&thermal_list_lock);
 921         list_for_each_entry(pos, &thermal_cdev_list, node)
 922             if (pos == cdev)
 923                 break;
 924         if (pos != cdev) {
 925                 /* thermal cooling device not found */
 926                 mutex_unlock(&thermal_list_lock);
 927                 return;
 928         }
 929         list_del(&cdev->node);
 930         list_for_each_entry(tz, &thermal_tz_list, node) {
 931                 if (!tz->ops->unbind)
 932                         continue;
 933                 tz->ops->unbind(tz, cdev);
 934         }
 935         mutex_unlock(&thermal_list_lock);
 936         if (cdev->type[0])
 937                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 938         device_remove_file(&cdev->device, &dev_attr_max_state);
 939         device_remove_file(&cdev->device, &dev_attr_cur_state);
 940
 941         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 942         device_unregister(&cdev->device);
 943         return;
 944 }
 945
 946 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 947
 948 /**
 949  * thermal_zone_device_update - force an update of a thermal zone's state
 950  * @ttz:        the thermal zone to update
 951  */
 952
 953 void thermal_zone_device_update(struct thermal_zone_device *tz)
 954 {
 955         int count, ret = 0;
 956         long temp, trip_temp;
 957         enum thermal_trip_type trip_type;
 958         struct thermal_cooling_device_instance *instance;
 959         struct thermal_cooling_device *cdev;
 960
 961         mutex_lock(&tz->lock);
 962
 963         if (tz->ops->get_temp(tz, &temp)) {
 964                 /* get_temp failed - retry it later */
 965                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
 966                        "%d\n", tz->id);
 967                 goto leave;
 968         }
 969
 970         for (count = 0; count < tz->trips; count++) {
 971                 tz->ops->get_trip_type(tz, count, &trip_type);
 972                 tz->ops->get_trip_temp(tz, count, &trip_temp);
 973
 974                 switch (trip_type) {
 975                 case THERMAL_TRIP_CRITICAL:
 976                         if (temp >= trip_temp) {
 977                                 if (tz->ops->notify)
 978                                         ret = tz->ops->notify(tz, count,
 979                                                               trip_type);
 980                                 if (!ret) {
 981                                         printk(KERN_EMERG
 982                                                "Critical temperature reached (%ld C), shutting down.\n",
 983                                                temp/1000);
 984                                         orderly_poweroff(true);
 985                                 }
 986                         }
 987                         break;
 988                 case THERMAL_TRIP_HOT:
 989                         if (temp >= trip_temp)
 990                                 if (tz->ops->notify)
 991                                         tz->ops->notify(tz, count, trip_type);
 992                         break;
 993                 case THERMAL_TRIP_ACTIVE:
 994                         list_for_each_entry(instance, &tz->cooling_devices,
 995                                             node) {
 996                                 if (instance->trip != count)
 997                                         continue;
 998
 999                                 cdev = instance->cdev;
1000
1001                                 if (temp >= trip_temp)
1002                                         cdev->ops->set_cur_state(cdev, 1);
1003                                 else
1004                                         cdev->ops->set_cur_state(cdev, 0);
1005                         }
1006                         break;
1007                 case THERMAL_TRIP_PASSIVE:
1008                         if (temp >= trip_temp || tz->passive)
1009                                 thermal_zone_device_passive(tz, temp,
1010                                                             trip_temp, count);
1011                         break;
1012                 }
1013         }
1014
1015         if (tz->forced_passive)
1016                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1017                                             THERMAL_TRIPS_NONE);
1018
1019         tz->last_temperature = temp;
1020
1021       leave:
1022         if (tz->passive)
1023                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1024         else if (tz->polling_delay)
1025                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1026         else
1027                 thermal_zone_device_set_polling(tz, 0);
1028         mutex_unlock(&tz->lock);
1029 }
1030 EXPORT_SYMBOL(thermal_zone_device_update);
1031
1032 /**
1033  * thermal_zone_device_register - register a new thermal zone device
1034  * @type:       the thermal zone device type
1035  * @trips:      the number of trip points the thermal zone support
1036  * @devdata:    private device data
1037  * @ops:        standard thermal zone device callbacks
1038  * @tc1:        thermal coefficient 1 for passive calculations
1039  * @tc2:        thermal coefficient 2 for passive calculations
1040  * @passive_delay: number of milliseconds to wait between polls when
1041  *                 performing passive cooling
1042  * @polling_delay: number of milliseconds to wait between polls when checking
1043  *                 whether trip points have been crossed (0 for interrupt
1044  *                 driven systems)
1045  *
1046  * thermal_zone_device_unregister() must be called when the device is no
1047  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1048  * section 11.1.5.1 of the ACPI specification 3.0.
1049  */
1050 struct thermal_zone_device *thermal_zone_device_register(char *type,
1051                                                          int trips,
1052                                                          void *devdata, struct
1053                                                          thermal_zone_device_ops
1054                                                          *ops, int tc1, int
1055                                                          tc2,
1056                                                          int passive_delay,
1057                                                          int polling_delay)
1058 {
1059         struct thermal_zone_device *tz;
1060         struct thermal_cooling_device *pos;
1061         enum thermal_trip_type trip_type;
1062         int result;
1063         int count;
1064         int passive = 0;
1065
1066         if (strlen(type) >= THERMAL_NAME_LENGTH)
1067                 return ERR_PTR(-EINVAL);
1068
1069         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1070                 return ERR_PTR(-EINVAL);
1071
1072         if (!ops || !ops->get_temp)
1073                 return ERR_PTR(-EINVAL);
1074
1075         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1076         if (!tz)
1077                 return ERR_PTR(-ENOMEM);
1078
1079         INIT_LIST_HEAD(&tz->cooling_devices);
1080         idr_init(&tz->idr);
1081         mutex_init(&tz->lock);
1082         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1083         if (result) {
1084                 kfree(tz);
1085                 return ERR_PTR(result);
1086         }
1087
1088         strcpy(tz->type, type);
1089         tz->ops = ops;
1090         tz->device.class = &thermal_class;
1091         tz->devdata = devdata;
1092         tz->trips = trips;
1093         tz->tc1 = tc1;
1094         tz->tc2 = tc2;
1095         tz->passive_delay = passive_delay;
1096         tz->polling_delay = polling_delay;
1097
1098         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1099         result = device_register(&tz->device);
1100         if (result) {
1101                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1102                 kfree(tz);
1103                 return ERR_PTR(result);
1104         }
1105
1106         /* sys I/F */
1107         if (type) {
1108                 result = device_create_file(&tz->device, &dev_attr_type);
1109                 if (result)
1110                         goto unregister;
1111         }
1112
1113         result = device_create_file(&tz->device, &dev_attr_temp);
1114         if (result)
1115                 goto unregister;
1116
1117         if (ops->get_mode) {
1118                 result = device_create_file(&tz->device, &dev_attr_mode);
1119                 if (result)
1120                         goto unregister;
1121         }
1122
1123         for (count = 0; count < trips; count++) {
1124                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1125                 if (result)
1126                         goto unregister;
1127                 tz->ops->get_trip_type(tz, count, &trip_type);
1128                 if (trip_type == THERMAL_TRIP_PASSIVE)
1129                         passive = 1;
1130         }
1131
1132         if (!passive)
1133                 result = device_create_file(&tz->device,
1134                                             &dev_attr_passive);
1135
1136         if (result)
1137                 goto unregister;
1138
1139         result = thermal_add_hwmon_sysfs(tz);
1140         if (result)
1141                 goto unregister;
1142
1143         mutex_lock(&thermal_list_lock);
1144         list_add_tail(&tz->node, &thermal_tz_list);
1145         if (ops->bind)
1146                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1147                 result = ops->bind(tz, pos);
1148                 if (result)
1149                         break;
1150                 }
1151         mutex_unlock(&thermal_list_lock);
1152
1153         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1154
1155         thermal_zone_device_update(tz);
1156
1157         if (!result)
1158                 return tz;
1159
1160       unregister:
1161         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1162         device_unregister(&tz->device);
1163         return ERR_PTR(result);
1164 }
1165
1166 EXPORT_SYMBOL(thermal_zone_device_register);
1167
1168 /**
1169  * thermal_device_unregister - removes the registered thermal zone device
1170  * @tz: the thermal zone device to remove
1171  */
1172 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1173 {
1174         struct thermal_cooling_device *cdev;
1175         struct thermal_zone_device *pos = NULL;
1176         int count;
1177
1178         if (!tz)
1179                 return;
1180
1181         mutex_lock(&thermal_list_lock);
1182         list_for_each_entry(pos, &thermal_tz_list, node)
1183             if (pos == tz)
1184                 break;
1185         if (pos != tz) {
1186                 /* thermal zone device not found */
1187                 mutex_unlock(&thermal_list_lock);
1188                 return;
1189         }
1190         list_del(&tz->node);
1191         if (tz->ops->unbind)
1192                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1193                     tz->ops->unbind(tz, cdev);
1194         mutex_unlock(&thermal_list_lock);
1195
1196         thermal_zone_device_set_polling(tz, 0);
1197
1198         if (tz->type[0])
1199                 device_remove_file(&tz->device, &dev_attr_type);
1200         device_remove_file(&tz->device, &dev_attr_temp);
1201         if (tz->ops->get_mode)
1202                 device_remove_file(&tz->device, &dev_attr_mode);
1203
1204         for (count = 0; count < tz->trips; count++)
1205                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1206
1207         thermal_remove_hwmon_sysfs(tz);
1208         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1209         idr_destroy(&tz->idr);
1210         mutex_destroy(&tz->lock);
1211         device_unregister(&tz->device);
1212         return;
1213 }
1214
1215 EXPORT_SYMBOL(thermal_zone_device_unregister);
1216
1217 static int __init thermal_init(void)
1218 {
1219         int result = 0;
1220
1221         result = class_register(&thermal_class);
1222         if (result) {
1223                 idr_destroy(&thermal_tz_idr);
1224                 idr_destroy(&thermal_cdev_idr);
1225                 mutex_destroy(&thermal_idr_lock);
1226                 mutex_destroy(&thermal_list_lock);
1227         }
1228         return result;
1229 }
1230
1231 static void __exit thermal_exit(void)
1232 {
1233         class_unregister(&thermal_class);
1234         idr_destroy(&thermal_tz_idr);
1235         idr_destroy(&thermal_cdev_idr);
1236         mutex_destroy(&thermal_idr_lock);
1237         mutex_destroy(&thermal_list_lock);
1238 }
1239
1240 subsys_initcall(thermal_init);
1241 module_exit(thermal_exit);