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
  34 MODULE_AUTHOR("Zhang Rui");
  35 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  36 MODULE_LICENSE("GPL");
  37
  38 #define PREFIX "Thermal: "
  39
  40 struct thermal_cooling_device_instance {
  41         int id;
  42         char name[THERMAL_NAME_LENGTH];
  43         struct thermal_zone_device *tz;
  44         struct thermal_cooling_device *cdev;
  45         int trip;
  46         char attr_name[THERMAL_NAME_LENGTH];
  47         struct device_attribute attr;
  48         struct list_head node;
  49 };
  50
  51 static DEFINE_IDR(thermal_tz_idr);
  52 static DEFINE_IDR(thermal_cdev_idr);
  53 static DEFINE_MUTEX(thermal_idr_lock);
  54
  55 static LIST_HEAD(thermal_tz_list);
  56 static LIST_HEAD(thermal_cdev_list);
  57 static DEFINE_MUTEX(thermal_list_lock);
  58
  59 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  60 {
  61         int err;
  62
  63       again:
  64         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  65                 return -ENOMEM;
  66
  67         if (lock)
  68                 mutex_lock(lock);
  69         err = idr_get_new(idr, NULL, id);
  70         if (lock)
  71                 mutex_unlock(lock);
  72         if (unlikely(err == -EAGAIN))
  73                 goto again;
  74         else if (unlikely(err))
  75                 return err;
  76
  77         *id = *id & MAX_ID_MASK;
  78         return 0;
  79 }
  80
  81 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  82 {
  83         if (lock)
  84                 mutex_lock(lock);
  85         idr_remove(idr, id);
  86         if (lock)
  87                 mutex_unlock(lock);
  88 }
  89
  90 /* sys I/F for thermal zone */
  91
  92 #define to_thermal_zone(_dev) \
  93         container_of(_dev, struct thermal_zone_device, device)
  94
  95 static ssize_t
  96 type_show(struct device *dev, struct device_attribute *attr, char *buf)
  97 {
  98         struct thermal_zone_device *tz = to_thermal_zone(dev);
  99
 100         return sprintf(buf, "%s\n", tz->type);
 101 }
 102
 103 static ssize_t
 104 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 105 {
 106         struct thermal_zone_device *tz = to_thermal_zone(dev);
 107         long temperature;
 108         int ret;
 109
 110         if (!tz->ops->get_temp)
 111                 return -EPERM;
 112
 113         ret = tz->ops->get_temp(tz, &temperature);
 114
 115         if (ret)
 116                 return ret;
 117
 118         return sprintf(buf, "%ld\n", temperature);
 119 }
 120
 121 static ssize_t
 122 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 123 {
 124         struct thermal_zone_device *tz = to_thermal_zone(dev);
 125         enum thermal_device_mode mode;
 126         int result;
 127
 128         if (!tz->ops->get_mode)
 129                 return -EPERM;
 130
 131         result = tz->ops->get_mode(tz, &mode);
 132         if (result)
 133                 return result;
 134
 135         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 136                        : "disabled");
 137 }
 138
 139 static ssize_t
 140 mode_store(struct device *dev, struct device_attribute *attr,
 141            const char *buf, size_t count)
 142 {
 143         struct thermal_zone_device *tz = to_thermal_zone(dev);
 144         int result;
 145
 146         if (!tz->ops->set_mode)
 147                 return -EPERM;
 148
 149         if (!strncmp(buf, "enabled", sizeof("enabled")))
 150                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 151         else if (!strncmp(buf, "disabled", sizeof("disabled")))
 152                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 153         else
 154                 result = -EINVAL;
 155
 156         if (result)
 157                 return result;
 158
 159         return count;
 160 }
 161
 162 static ssize_t
 163 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 164                      char *buf)
 165 {
 166         struct thermal_zone_device *tz = to_thermal_zone(dev);
 167         enum thermal_trip_type type;
 168         int trip, result;
 169
 170         if (!tz->ops->get_trip_type)
 171                 return -EPERM;
 172
 173         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 174                 return -EINVAL;
 175
 176         result = tz->ops->get_trip_type(tz, trip, &type);
 177         if (result)
 178                 return result;
 179
 180         switch (type) {
 181         case THERMAL_TRIP_CRITICAL:
 182                 return sprintf(buf, "critical");
 183         case THERMAL_TRIP_HOT:
 184                 return sprintf(buf, "hot");
 185         case THERMAL_TRIP_PASSIVE:
 186                 return sprintf(buf, "passive");
 187         case THERMAL_TRIP_ACTIVE:
 188                 return sprintf(buf, "active");
 189         default:
 190                 return sprintf(buf, "unknown");
 191         }
 192 }
 193
 194 static ssize_t
 195 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 196                      char *buf)
 197 {
 198         struct thermal_zone_device *tz = to_thermal_zone(dev);
 199         int trip, ret;
 200         long temperature;
 201
 202         if (!tz->ops->get_trip_temp)
 203                 return -EPERM;
 204
 205         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 206                 return -EINVAL;
 207
 208         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 209
 210         if (ret)
 211                 return ret;
 212
 213         return sprintf(buf, "%ld\n", temperature);
 214 }
 215
 216 static DEVICE_ATTR(type, 0444, type_show, NULL);
 217 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 218 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 219
 220 static struct device_attribute trip_point_attrs[] = {
 221         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 222         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 223         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 224         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 225         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 226         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 227         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 228         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 229         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 230         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 231         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 232         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 233         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 234         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 235         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 236         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 237         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 238         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 239         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 240         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 241         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
 242         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
 243         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
 244         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
 245 };
 246
 247 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 248 do {    \
 249         result = device_create_file(_dev,       \
 250                                 &trip_point_attrs[_index * 2]); \
 251         if (result)     \
 252                 break;  \
 253         result = device_create_file(_dev,       \
 254                         &trip_point_attrs[_index * 2 + 1]);     \
 255 } while (0)
 256
 257 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 258 do {    \
 259         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 260         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 261 } while (0)
 262
 263 /* sys I/F for cooling device */
 264 #define to_cooling_device(_dev) \
 265         container_of(_dev, struct thermal_cooling_device, device)
 266
 267 static ssize_t
 268 thermal_cooling_device_type_show(struct device *dev,
 269                                  struct device_attribute *attr, char *buf)
 270 {
 271         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 272
 273         return sprintf(buf, "%s\n", cdev->type);
 274 }
 275
 276 static ssize_t
 277 thermal_cooling_device_max_state_show(struct device *dev,
 278                                       struct device_attribute *attr, char *buf)
 279 {
 280         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 281         unsigned long state;
 282         int ret;
 283
 284         ret = cdev->ops->get_max_state(cdev, &state);
 285         if (ret)
 286                 return ret;
 287         return sprintf(buf, "%ld\n", state);
 288 }
 289
 290 static ssize_t
 291 thermal_cooling_device_cur_state_show(struct device *dev,
 292                                       struct device_attribute *attr, char *buf)
 293 {
 294         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 295         unsigned long state;
 296         int ret;
 297
 298         ret = cdev->ops->get_cur_state(cdev, &state);
 299         if (ret)
 300                 return ret;
 301         return sprintf(buf, "%ld\n", state);
 302 }
 303
 304 static ssize_t
 305 thermal_cooling_device_cur_state_store(struct device *dev,
 306                                        struct device_attribute *attr,
 307                                        const char *buf, size_t count)
 308 {
 309         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 310         unsigned long state;
 311         int result;
 312
 313         if (!sscanf(buf, "%ld\n", &state))
 314                 return -EINVAL;
 315
 316         if (state < 0)
 317                 return -EINVAL;
 318
 319         result = cdev->ops->set_cur_state(cdev, state);
 320         if (result)
 321                 return result;
 322         return count;
 323 }
 324
 325 static struct device_attribute dev_attr_cdev_type =
 326 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 327 static DEVICE_ATTR(max_state, 0444,
 328                    thermal_cooling_device_max_state_show, NULL);
 329 static DEVICE_ATTR(cur_state, 0644,
 330                    thermal_cooling_device_cur_state_show,
 331                    thermal_cooling_device_cur_state_store);
 332
 333 static ssize_t
 334 thermal_cooling_device_trip_point_show(struct device *dev,
 335                                        struct device_attribute *attr, char *buf)
 336 {
 337         struct thermal_cooling_device_instance *instance;
 338
 339         instance =
 340             container_of(attr, struct thermal_cooling_device_instance, attr);
 341
 342         if (instance->trip == THERMAL_TRIPS_NONE)
 343                 return sprintf(buf, "-1\n");
 344         else
 345                 return sprintf(buf, "%d\n", instance->trip);
 346 }
 347
 348 /* Device management */
 349
 350 #if defined(CONFIG_THERMAL_HWMON)
 351
 352 /* hwmon sys I/F */
 353 #include <linux/hwmon.h>
 354 static LIST_HEAD(thermal_hwmon_list);
 355
 356 static ssize_t
 357 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 358 {
 359         struct thermal_hwmon_device *hwmon = dev->driver_data;
 360         return sprintf(buf, "%s\n", hwmon->type);
 361 }
 362 static DEVICE_ATTR(name, 0444, name_show, NULL);
 363
 364 static ssize_t
 365 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 366 {
 367         long temperature;
 368         int ret;
 369         struct thermal_hwmon_attr *hwmon_attr
 370                         = container_of(attr, struct thermal_hwmon_attr, attr);
 371         struct thermal_zone_device *tz
 372                         = container_of(hwmon_attr, struct thermal_zone_device,
 373                                        temp_input);
 374
 375         ret = tz->ops->get_temp(tz, &temperature);
 376
 377         if (ret)
 378                 return ret;
 379
 380         return sprintf(buf, "%ld\n", temperature);
 381 }
 382
 383 static ssize_t
 384 temp_crit_show(struct device *dev, struct device_attribute *attr,
 385                 char *buf)
 386 {
 387         struct thermal_hwmon_attr *hwmon_attr
 388                         = container_of(attr, struct thermal_hwmon_attr, attr);
 389         struct thermal_zone_device *tz
 390                         = container_of(hwmon_attr, struct thermal_zone_device,
 391                                        temp_crit);
 392         long temperature;
 393         int ret;
 394
 395         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 396         if (ret)
 397                 return ret;
 398
 399         return sprintf(buf, "%ld\n", temperature);
 400 }
 401
 402
 403 static int
 404 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 405 {
 406         struct thermal_hwmon_device *hwmon;
 407         int new_hwmon_device = 1;
 408         int result;
 409
 410         mutex_lock(&thermal_list_lock);
 411         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 412                 if (!strcmp(hwmon->type, tz->type)) {
 413                         new_hwmon_device = 0;
 414                         mutex_unlock(&thermal_list_lock);
 415                         goto register_sys_interface;
 416                 }
 417         mutex_unlock(&thermal_list_lock);
 418
 419         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 420         if (!hwmon)
 421                 return -ENOMEM;
 422
 423         INIT_LIST_HEAD(&hwmon->tz_list);
 424         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 425         hwmon->device = hwmon_device_register(NULL);
 426         if (IS_ERR(hwmon->device)) {
 427                 result = PTR_ERR(hwmon->device);
 428                 goto free_mem;
 429         }
 430         hwmon->device->driver_data = hwmon;
 431         result = device_create_file(hwmon->device, &dev_attr_name);
 432         if (result)
 433                 goto unregister_hwmon_device;
 434
 435  register_sys_interface:
 436         tz->hwmon = hwmon;
 437         hwmon->count++;
 438
 439         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
 440                  "temp%d_input", hwmon->count);
 441         tz->temp_input.attr.attr.name = tz->temp_input.name;
 442         tz->temp_input.attr.attr.mode = 0444;
 443         tz->temp_input.attr.show = temp_input_show;
 444         result = device_create_file(hwmon->device, &tz->temp_input.attr);
 445         if (result)
 446                 goto unregister_hwmon_device;
 447
 448         if (tz->ops->get_crit_temp) {
 449                 unsigned long temperature;
 450                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
 451                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
 452                                 "temp%d_crit", hwmon->count);
 453                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
 454                         tz->temp_crit.attr.attr.mode = 0444;
 455                         tz->temp_crit.attr.show = temp_crit_show;
 456                         result = device_create_file(hwmon->device,
 457                                                     &tz->temp_crit.attr);
 458                         if (result)
 459                                 goto unregister_hwmon_device;
 460                 }
 461         }
 462
 463         mutex_lock(&thermal_list_lock);
 464         if (new_hwmon_device)
 465                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
 466         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
 467         mutex_unlock(&thermal_list_lock);
 468
 469         return 0;
 470
 471  unregister_hwmon_device:
 472         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 473         device_remove_file(hwmon->device, &tz->temp_input.attr);
 474         if (new_hwmon_device) {
 475                 device_remove_file(hwmon->device, &dev_attr_name);
 476                 hwmon_device_unregister(hwmon->device);
 477         }
 478  free_mem:
 479         if (new_hwmon_device)
 480                 kfree(hwmon);
 481
 482         return result;
 483 }
 484
 485 static void
 486 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 487 {
 488         struct thermal_hwmon_device *hwmon = tz->hwmon;
 489
 490         tz->hwmon = NULL;
 491         device_remove_file(hwmon->device, &tz->temp_input.attr);
 492         device_remove_file(hwmon->device, &tz->temp_crit.attr);
 493
 494         mutex_lock(&thermal_list_lock);
 495         list_del(&tz->hwmon_node);
 496         if (!list_empty(&hwmon->tz_list)) {
 497                 mutex_unlock(&thermal_list_lock);
 498                 return;
 499         }
 500         list_del(&hwmon->node);
 501         mutex_unlock(&thermal_list_lock);
 502
 503         device_remove_file(hwmon->device, &dev_attr_name);
 504         hwmon_device_unregister(hwmon->device);
 505         kfree(hwmon);
 506 }
 507 #else
 508 static int
 509 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 510 {
 511         return 0;
 512 }
 513
 514 static void
 515 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 516 {
 517 }
 518 #endif
 519
 520
 521 /**
 522  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 523  * @tz:         thermal zone device
 524  * @trip:       indicates which trip point the cooling devices is
 525  *              associated with in this thermal zone.
 526  * @cdev:       thermal cooling device
 527  *
 528  * This function is usually called in the thermal zone device .bind callback.
 529  */
 530 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 531                                      int trip,
 532                                      struct thermal_cooling_device *cdev)
 533 {
 534         struct thermal_cooling_device_instance *dev;
 535         struct thermal_cooling_device_instance *pos;
 536         struct thermal_zone_device *pos1;
 537         struct thermal_cooling_device *pos2;
 538         int result;
 539
 540         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 541                 return -EINVAL;
 542
 543         list_for_each_entry(pos1, &thermal_tz_list, node) {
 544                 if (pos1 == tz)
 545                         break;
 546         }
 547         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 548                 if (pos2 == cdev)
 549                         break;
 550         }
 551
 552         if (tz != pos1 || cdev != pos2)
 553                 return -EINVAL;
 554
 555         dev =
 556             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 557         if (!dev)
 558                 return -ENOMEM;
 559         dev->tz = tz;
 560         dev->cdev = cdev;
 561         dev->trip = trip;
 562         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 563         if (result)
 564                 goto free_mem;
 565
 566         sprintf(dev->name, "cdev%d", dev->id);
 567         result =
 568             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 569         if (result)
 570                 goto release_idr;
 571
 572         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 573         dev->attr.attr.name = dev->attr_name;
 574         dev->attr.attr.mode = 0444;
 575         dev->attr.show = thermal_cooling_device_trip_point_show;
 576         result = device_create_file(&tz->device, &dev->attr);
 577         if (result)
 578                 goto remove_symbol_link;
 579
 580         mutex_lock(&tz->lock);
 581         list_for_each_entry(pos, &tz->cooling_devices, node)
 582             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 583                 result = -EEXIST;
 584                 break;
 585         }
 586         if (!result)
 587                 list_add_tail(&dev->node, &tz->cooling_devices);
 588         mutex_unlock(&tz->lock);
 589
 590         if (!result)
 591                 return 0;
 592
 593         device_remove_file(&tz->device, &dev->attr);
 594       remove_symbol_link:
 595         sysfs_remove_link(&tz->device.kobj, dev->name);
 596       release_idr:
 597         release_idr(&tz->idr, &tz->lock, dev->id);
 598       free_mem:
 599         kfree(dev);
 600         return result;
 601 }
 602
 603 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 604
 605 /**
 606  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 607  * @tz:         thermal zone device
 608  * @trip:       indicates which trip point the cooling devices is
 609  *              associated with in this thermal zone.
 610  * @cdev:       thermal cooling device
 611  *
 612  * This function is usually called in the thermal zone device .unbind callback.
 613  */
 614 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 615                                        int trip,
 616                                        struct thermal_cooling_device *cdev)
 617 {
 618         struct thermal_cooling_device_instance *pos, *next;
 619
 620         mutex_lock(&tz->lock);
 621         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 622                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 623                         list_del(&pos->node);
 624                         mutex_unlock(&tz->lock);
 625                         goto unbind;
 626                 }
 627         }
 628         mutex_unlock(&tz->lock);
 629
 630         return -ENODEV;
 631
 632       unbind:
 633         device_remove_file(&tz->device, &pos->attr);
 634         sysfs_remove_link(&tz->device.kobj, pos->name);
 635         release_idr(&tz->idr, &tz->lock, pos->id);
 636         kfree(pos);
 637         return 0;
 638 }
 639
 640 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 641
 642 static void thermal_release(struct device *dev)
 643 {
 644         struct thermal_zone_device *tz;
 645         struct thermal_cooling_device *cdev;
 646
 647         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
 648                 tz = to_thermal_zone(dev);
 649                 kfree(tz);
 650         } else {
 651                 cdev = to_cooling_device(dev);
 652                 kfree(cdev);
 653         }
 654 }
 655
 656 static struct class thermal_class = {
 657         .name = "thermal",
 658         .dev_release = thermal_release,
 659 };
 660
 661 /**
 662  * thermal_cooling_device_register - register a new thermal cooling device
 663  * @type:       the thermal cooling device type.
 664  * @devdata:    device private data.
 665  * @ops:                standard thermal cooling devices callbacks.
 666  */
 667 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 668                                                                void *devdata,
 669                                                                struct
 670                                                                thermal_cooling_device_ops
 671                                                                *ops)
 672 {
 673         struct thermal_cooling_device *cdev;
 674         struct thermal_zone_device *pos;
 675         int result;
 676
 677         if (strlen(type) >= THERMAL_NAME_LENGTH)
 678                 return ERR_PTR(-EINVAL);
 679
 680         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 681             !ops->set_cur_state)
 682                 return ERR_PTR(-EINVAL);
 683
 684         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 685         if (!cdev)
 686                 return ERR_PTR(-ENOMEM);
 687
 688         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 689         if (result) {
 690                 kfree(cdev);
 691                 return ERR_PTR(result);
 692         }
 693
 694         strcpy(cdev->type, type);
 695         cdev->ops = ops;
 696         cdev->device.class = &thermal_class;
 697         cdev->devdata = devdata;
 698         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 699         result = device_register(&cdev->device);
 700         if (result) {
 701                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 702                 kfree(cdev);
 703                 return ERR_PTR(result);
 704         }
 705
 706         /* sys I/F */
 707         if (type) {
 708                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 709                 if (result)
 710                         goto unregister;
 711         }
 712
 713         result = device_create_file(&cdev->device, &dev_attr_max_state);
 714         if (result)
 715                 goto unregister;
 716
 717         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 718         if (result)
 719                 goto unregister;
 720
 721         mutex_lock(&thermal_list_lock);
 722         list_add(&cdev->node, &thermal_cdev_list);
 723         list_for_each_entry(pos, &thermal_tz_list, node) {
 724                 if (!pos->ops->bind)
 725                         continue;
 726                 result = pos->ops->bind(pos, cdev);
 727                 if (result)
 728                         break;
 729
 730         }
 731         mutex_unlock(&thermal_list_lock);
 732
 733         if (!result)
 734                 return cdev;
 735
 736       unregister:
 737         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 738         device_unregister(&cdev->device);
 739         return ERR_PTR(result);
 740 }
 741
 742 EXPORT_SYMBOL(thermal_cooling_device_register);
 743
 744 /**
 745  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 746  * @cdev:       the thermal cooling device to remove.
 747  *
 748  * thermal_cooling_device_unregister() must be called when the device is no
 749  * longer needed.
 750  */
 751 void thermal_cooling_device_unregister(struct
 752                                        thermal_cooling_device
 753                                        *cdev)
 754 {
 755         struct thermal_zone_device *tz;
 756         struct thermal_cooling_device *pos = NULL;
 757
 758         if (!cdev)
 759                 return;
 760
 761         mutex_lock(&thermal_list_lock);
 762         list_for_each_entry(pos, &thermal_cdev_list, node)
 763             if (pos == cdev)
 764                 break;
 765         if (pos != cdev) {
 766                 /* thermal cooling device not found */
 767                 mutex_unlock(&thermal_list_lock);
 768                 return;
 769         }
 770         list_del(&cdev->node);
 771         list_for_each_entry(tz, &thermal_tz_list, node) {
 772                 if (!tz->ops->unbind)
 773                         continue;
 774                 tz->ops->unbind(tz, cdev);
 775         }
 776         mutex_unlock(&thermal_list_lock);
 777         if (cdev->type[0])
 778                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
 779         device_remove_file(&cdev->device, &dev_attr_max_state);
 780         device_remove_file(&cdev->device, &dev_attr_cur_state);
 781
 782         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 783         device_unregister(&cdev->device);
 784         return;
 785 }
 786
 787 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 788
 789 /**
 790  * thermal_zone_device_register - register a new thermal zone device
 791  * @type:       the thermal zone device type
 792  * @trips:      the number of trip points the thermal zone support
 793  * @devdata:    private device data
 794  * @ops:        standard thermal zone device callbacks
 795  *
 796  * thermal_zone_device_unregister() must be called when the device is no
 797  * longer needed.
 798  */
 799 struct thermal_zone_device *thermal_zone_device_register(char *type,
 800                                                          int trips,
 801                                                          void *devdata, struct
 802                                                          thermal_zone_device_ops
 803                                                          *ops)
 804 {
 805         struct thermal_zone_device *tz;
 806         struct thermal_cooling_device *pos;
 807         int result;
 808         int count;
 809
 810         if (strlen(type) >= THERMAL_NAME_LENGTH)
 811                 return ERR_PTR(-EINVAL);
 812
 813         if (trips > THERMAL_MAX_TRIPS || trips < 0)
 814                 return ERR_PTR(-EINVAL);
 815
 816         if (!ops || !ops->get_temp)
 817                 return ERR_PTR(-EINVAL);
 818
 819         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
 820         if (!tz)
 821                 return ERR_PTR(-ENOMEM);
 822
 823         INIT_LIST_HEAD(&tz->cooling_devices);
 824         idr_init(&tz->idr);
 825         mutex_init(&tz->lock);
 826         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
 827         if (result) {
 828                 kfree(tz);
 829                 return ERR_PTR(result);
 830         }
 831
 832         strcpy(tz->type, type);
 833         tz->ops = ops;
 834         tz->device.class = &thermal_class;
 835         tz->devdata = devdata;
 836         tz->trips = trips;
 837         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
 838         result = device_register(&tz->device);
 839         if (result) {
 840                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 841                 kfree(tz);
 842                 return ERR_PTR(result);
 843         }
 844
 845         /* sys I/F */
 846         if (type) {
 847                 result = device_create_file(&tz->device, &dev_attr_type);
 848                 if (result)
 849                         goto unregister;
 850         }
 851
 852         result = device_create_file(&tz->device, &dev_attr_temp);
 853         if (result)
 854                 goto unregister;
 855
 856         if (ops->get_mode) {
 857                 result = device_create_file(&tz->device, &dev_attr_mode);
 858                 if (result)
 859                         goto unregister;
 860         }
 861
 862         for (count = 0; count < trips; count++) {
 863                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
 864                 if (result)
 865                         goto unregister;
 866         }
 867
 868         result = thermal_add_hwmon_sysfs(tz);
 869         if (result)
 870                 goto unregister;
 871
 872         mutex_lock(&thermal_list_lock);
 873         list_add_tail(&tz->node, &thermal_tz_list);
 874         if (ops->bind)
 875                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 876                 result = ops->bind(tz, pos);
 877                 if (result)
 878                         break;
 879                 }
 880         mutex_unlock(&thermal_list_lock);
 881
 882         if (!result)
 883                 return tz;
 884
 885       unregister:
 886         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 887         device_unregister(&tz->device);
 888         return ERR_PTR(result);
 889 }
 890
 891 EXPORT_SYMBOL(thermal_zone_device_register);
 892
 893 /**
 894  * thermal_device_unregister - removes the registered thermal zone device
 895  * @tz: the thermal zone device to remove
 896  */
 897 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 898 {
 899         struct thermal_cooling_device *cdev;
 900         struct thermal_zone_device *pos = NULL;
 901         int count;
 902
 903         if (!tz)
 904                 return;
 905
 906         mutex_lock(&thermal_list_lock);
 907         list_for_each_entry(pos, &thermal_tz_list, node)
 908             if (pos == tz)
 909                 break;
 910         if (pos != tz) {
 911                 /* thermal zone device not found */
 912                 mutex_unlock(&thermal_list_lock);
 913                 return;
 914         }
 915         list_del(&tz->node);
 916         if (tz->ops->unbind)
 917                 list_for_each_entry(cdev, &thermal_cdev_list, node)
 918                     tz->ops->unbind(tz, cdev);
 919         mutex_unlock(&thermal_list_lock);
 920
 921         if (tz->type[0])
 922                 device_remove_file(&tz->device, &dev_attr_type);
 923         device_remove_file(&tz->device, &dev_attr_temp);
 924         if (tz->ops->get_mode)
 925                 device_remove_file(&tz->device, &dev_attr_mode);
 926
 927         for (count = 0; count < tz->trips; count++)
 928                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
 929
 930         thermal_remove_hwmon_sysfs(tz);
 931         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 932         idr_destroy(&tz->idr);
 933         mutex_destroy(&tz->lock);
 934         device_unregister(&tz->device);
 935         return;
 936 }
 937
 938 EXPORT_SYMBOL(thermal_zone_device_unregister);
 939
 940 static int __init thermal_init(void)
 941 {
 942         int result = 0;
 943
 944         result = class_register(&thermal_class);
 945         if (result) {
 946                 idr_destroy(&thermal_tz_idr);
 947                 idr_destroy(&thermal_cdev_idr);
 948                 mutex_destroy(&thermal_idr_lock);
 949                 mutex_destroy(&thermal_list_lock);
 950         }
 951         return result;
 952 }
 953
 954 static void __exit thermal_exit(void)
 955 {
 956         class_unregister(&thermal_class);
 957         idr_destroy(&thermal_tz_idr);
 958         idr_destroy(&thermal_cdev_idr);
 959         mutex_destroy(&thermal_idr_lock);
 960         mutex_destroy(&thermal_list_lock);
 961 }
 962
 963 subsys_initcall(thermal_init);
 964 module_exit(thermal_exit);