drivers/thermal/thermal.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/hwmon.h>
  34 #include <linux/hwmon-sysfs.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 struct device *thermal_hwmon;
  62 #define MAX_THERMAL_ZONES       10
  63
  64 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
  65 {
  66         int err;
  67
  68       again:
  69         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
  70                 return -ENOMEM;
  71
  72         if (lock)
  73                 mutex_lock(lock);
  74         err = idr_get_new(idr, NULL, id);
  75         if (lock)
  76                 mutex_unlock(lock);
  77         if (unlikely(err == -EAGAIN))
  78                 goto again;
  79         else if (unlikely(err))
  80                 return err;
  81
  82         *id = *id & MAX_ID_MASK;
  83         return 0;
  84 }
  85
  86 static void release_idr(struct idr *idr, struct mutex *lock, int id)
  87 {
  88         if (lock)
  89                 mutex_lock(lock);
  90         idr_remove(idr, id);
  91         if (lock)
  92                 mutex_unlock(lock);
  93 }
  94
  95 /* hwmon sys I/F*/
  96 static ssize_t
  97 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  98 {
  99         return sprintf(buf, "thermal_sys_class\n");
 100 }
 101
 102 static ssize_t
 103 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 104 {
 105         struct thermal_zone_device *tz;
 106         struct sensor_device_attribute *sensor_attr
 107                                                 = to_sensor_dev_attr(attr);
 108
 109         list_for_each_entry(tz, &thermal_tz_list, node)
 110                 if (tz->id == sensor_attr->index)
 111                         return tz->ops->get_temp(tz, buf);
 112
 113         return -ENODEV;
 114 }
 115
 116 static ssize_t
 117 temp_crit_show(struct device *dev, struct device_attribute *attr,
 118                 char *buf)
 119 {
 120         struct thermal_zone_device *tz;
 121         struct sensor_device_attribute *sensor_attr
 122                                                 = to_sensor_dev_attr(attr);
 123
 124         list_for_each_entry(tz, &thermal_tz_list, node)
 125                 if (tz->id == sensor_attr->index)
 126                         return tz->ops->get_trip_temp(tz, 0, buf);
 127
 128         return -ENODEV;
 129 }
 130
 131 static DEVICE_ATTR(name, 0444, name_show, NULL);
 132 static struct sensor_device_attribute sensor_attrs[] = {
 133         SENSOR_ATTR(temp1_input, 0444, temp_input_show, NULL, 0),
 134         SENSOR_ATTR(temp1_crit, 0444, temp_crit_show, NULL, 0),
 135         SENSOR_ATTR(temp2_input, 0444, temp_input_show, NULL, 1),
 136         SENSOR_ATTR(temp2_crit, 0444, temp_crit_show, NULL, 1),
 137         SENSOR_ATTR(temp3_input, 0444, temp_input_show, NULL, 2),
 138         SENSOR_ATTR(temp3_crit, 0444, temp_crit_show, NULL, 2),
 139         SENSOR_ATTR(temp4_input, 0444, temp_input_show, NULL, 3),
 140         SENSOR_ATTR(temp4_crit, 0444, temp_crit_show, NULL, 3),
 141         SENSOR_ATTR(temp5_input, 0444, temp_input_show, NULL, 4),
 142         SENSOR_ATTR(temp5_crit, 0444, temp_crit_show, NULL, 4),
 143         SENSOR_ATTR(temp6_input, 0444, temp_input_show, NULL, 5),
 144         SENSOR_ATTR(temp6_crit, 0444, temp_crit_show, NULL, 5),
 145         SENSOR_ATTR(temp7_input, 0444, temp_input_show, NULL, 6),
 146         SENSOR_ATTR(temp7_crit, 0444, temp_crit_show, NULL, 6),
 147         SENSOR_ATTR(temp8_input, 0444, temp_input_show, NULL, 7),
 148         SENSOR_ATTR(temp8_crit, 0444, temp_crit_show, NULL, 7),
 149         SENSOR_ATTR(temp9_input, 0444, temp_input_show, NULL, 8),
 150         SENSOR_ATTR(temp9_crit, 0444, temp_crit_show, NULL, 8),
 151         SENSOR_ATTR(temp10_input, 0444, temp_input_show, NULL, 9),
 152         SENSOR_ATTR(temp10_crit, 0444, temp_crit_show, NULL, 9),
 153 };
 154
 155 /* thermal zone sys I/F */
 156
 157 #define to_thermal_zone(_dev) \
 158         container_of(_dev, struct thermal_zone_device, device)
 159
 160 static ssize_t
 161 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 162 {
 163         struct thermal_zone_device *tz = to_thermal_zone(dev);
 164
 165         return sprintf(buf, "%s\n", tz->type);
 166 }
 167
 168 static ssize_t
 169 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 170 {
 171         struct thermal_zone_device *tz = to_thermal_zone(dev);
 172
 173         if (!tz->ops->get_temp)
 174                 return -EPERM;
 175
 176         return tz->ops->get_temp(tz, buf);
 177 }
 178
 179 static ssize_t
 180 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 181 {
 182         struct thermal_zone_device *tz = to_thermal_zone(dev);
 183
 184         if (!tz->ops->get_mode)
 185                 return -EPERM;
 186
 187         return tz->ops->get_mode(tz, buf);
 188 }
 189
 190 static ssize_t
 191 mode_store(struct device *dev, struct device_attribute *attr,
 192            const char *buf, size_t count)
 193 {
 194         struct thermal_zone_device *tz = to_thermal_zone(dev);
 195         int result;
 196
 197         if (!tz->ops->set_mode)
 198                 return -EPERM;
 199
 200         result = tz->ops->set_mode(tz, buf);
 201         if (result)
 202                 return result;
 203
 204         return count;
 205 }
 206
 207 static ssize_t
 208 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 209                      char *buf)
 210 {
 211         struct thermal_zone_device *tz = to_thermal_zone(dev);
 212         int trip;
 213
 214         if (!tz->ops->get_trip_type)
 215                 return -EPERM;
 216
 217         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 218                 return -EINVAL;
 219
 220         return tz->ops->get_trip_type(tz, trip, buf);
 221 }
 222
 223 static ssize_t
 224 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 225                      char *buf)
 226 {
 227         struct thermal_zone_device *tz = to_thermal_zone(dev);
 228         int trip;
 229
 230         if (!tz->ops->get_trip_temp)
 231                 return -EPERM;
 232
 233         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 234                 return -EINVAL;
 235
 236         return tz->ops->get_trip_temp(tz, trip, buf);
 237 }
 238
 239 static DEVICE_ATTR(type, 0444, type_show, NULL);
 240 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 241 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 242
 243 static struct device_attribute trip_point_attrs[] = {
 244         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
 245         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
 246         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
 247         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
 248         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
 249         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
 250         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
 251         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
 252         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
 253         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
 254         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
 255         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
 256         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
 257         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
 258         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
 259         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
 260         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
 261         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
 262         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
 263         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
 264 };
 265
 266 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
 267 do {    \
 268         result = device_create_file(_dev,       \
 269                                 &trip_point_attrs[_index * 2]); \
 270         if (result)     \
 271                 break;  \
 272         result = device_create_file(_dev,       \
 273                         &trip_point_attrs[_index * 2 + 1]);     \
 274 } while (0)
 275
 276 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
 277 do {    \
 278         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
 279         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
 280 } while (0)
 281
 282 /* cooling device sys I/F */
 283 #define to_cooling_device(_dev) \
 284         container_of(_dev, struct thermal_cooling_device, device)
 285
 286 static ssize_t
 287 thermal_cooling_device_type_show(struct device *dev,
 288                                  struct device_attribute *attr, char *buf)
 289 {
 290         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 291
 292         return sprintf(buf, "%s\n", cdev->type);
 293 }
 294
 295 static ssize_t
 296 thermal_cooling_device_max_state_show(struct device *dev,
 297                                       struct device_attribute *attr, char *buf)
 298 {
 299         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 300
 301         return cdev->ops->get_max_state(cdev, buf);
 302 }
 303
 304 static ssize_t
 305 thermal_cooling_device_cur_state_show(struct device *dev,
 306                                       struct device_attribute *attr, char *buf)
 307 {
 308         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 309
 310         return cdev->ops->get_cur_state(cdev, buf);
 311 }
 312
 313 static ssize_t
 314 thermal_cooling_device_cur_state_store(struct device *dev,
 315                                        struct device_attribute *attr,
 316                                        const char *buf, size_t count)
 317 {
 318         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 319         int state;
 320         int result;
 321
 322         if (!sscanf(buf, "%d\n", &state))
 323                 return -EINVAL;
 324
 325         if (state < 0)
 326                 return -EINVAL;
 327
 328         result = cdev->ops->set_cur_state(cdev, state);
 329         if (result)
 330                 return result;
 331         return count;
 332 }
 333
 334 static struct device_attribute dev_attr_cdev_type =
 335 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 336 static DEVICE_ATTR(max_state, 0444,
 337                    thermal_cooling_device_max_state_show, NULL);
 338 static DEVICE_ATTR(cur_state, 0644,
 339                    thermal_cooling_device_cur_state_show,
 340                    thermal_cooling_device_cur_state_store);
 341
 342 static ssize_t
 343 thermal_cooling_device_trip_point_show(struct device *dev,
 344                                        struct device_attribute *attr, char *buf)
 345 {
 346         struct thermal_cooling_device_instance *instance;
 347
 348         instance =
 349             container_of(attr, struct thermal_cooling_device_instance, attr);
 350
 351         if (instance->trip == THERMAL_TRIPS_NONE)
 352                 return sprintf(buf, "-1\n");
 353         else
 354                 return sprintf(buf, "%d\n", instance->trip);
 355 }
 356
 357 /* Device management */
 358
 359 /**
 360  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
 361  * @tz:         thermal zone device
 362  * @trip:       indicates which trip point the cooling devices is
 363  *              associated with in this thermal zone.
 364  * @cdev:       thermal cooling device
 365  *
 366  * This function is usually called in the thermal zone device .bind callback.
 367  */
 368 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
 369                                      int trip,
 370                                      struct thermal_cooling_device *cdev)
 371 {
 372         struct thermal_cooling_device_instance *dev;
 373         struct thermal_cooling_device_instance *pos;
 374         struct thermal_zone_device *pos1;
 375         struct thermal_cooling_device *pos2;
 376         int result;
 377
 378         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 379                 return -EINVAL;
 380
 381         list_for_each_entry(pos1, &thermal_tz_list, node) {
 382                 if (pos1 == tz)
 383                         break;
 384         }
 385         list_for_each_entry(pos2, &thermal_cdev_list, node) {
 386                 if (pos2 == cdev)
 387                         break;
 388         }
 389
 390         if (tz != pos1 || cdev != pos2)
 391                 return -EINVAL;
 392
 393         dev =
 394             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
 395         if (!dev)
 396                 return -ENOMEM;
 397         dev->tz = tz;
 398         dev->cdev = cdev;
 399         dev->trip = trip;
 400         result = get_idr(&tz->idr, &tz->lock, &dev->id);
 401         if (result)
 402                 goto free_mem;
 403
 404         sprintf(dev->name, "cdev%d", dev->id);
 405         result =
 406             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
 407         if (result)
 408                 goto release_idr;
 409
 410         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
 411         dev->attr.attr.name = dev->attr_name;
 412         dev->attr.attr.mode = 0444;
 413         dev->attr.show = thermal_cooling_device_trip_point_show;
 414         result = device_create_file(&tz->device, &dev->attr);
 415         if (result)
 416                 goto remove_symbol_link;
 417
 418         mutex_lock(&tz->lock);
 419         list_for_each_entry(pos, &tz->cooling_devices, node)
 420             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 421                 result = -EEXIST;
 422                 break;
 423         }
 424         if (!result)
 425                 list_add_tail(&dev->node, &tz->cooling_devices);
 426         mutex_unlock(&tz->lock);
 427
 428         if (!result)
 429                 return 0;
 430
 431         device_remove_file(&tz->device, &dev->attr);
 432       remove_symbol_link:
 433         sysfs_remove_link(&tz->device.kobj, dev->name);
 434       release_idr:
 435         release_idr(&tz->idr, &tz->lock, dev->id);
 436       free_mem:
 437         kfree(dev);
 438         return result;
 439 }
 440
 441 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
 442
 443 /**
 444  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
 445  * @tz:         thermal zone device
 446  * @trip:       indicates which trip point the cooling devices is
 447  *              associated with in this thermal zone.
 448  * @cdev:       thermal cooling device
 449  *
 450  * This function is usually called in the thermal zone device .unbind callback.
 451  */
 452 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
 453                                        int trip,
 454                                        struct thermal_cooling_device *cdev)
 455 {
 456         struct thermal_cooling_device_instance *pos, *next;
 457
 458         mutex_lock(&tz->lock);
 459         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
 460                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 461                         list_del(&pos->node);
 462                         mutex_unlock(&tz->lock);
 463                         goto unbind;
 464                 }
 465         }
 466         mutex_unlock(&tz->lock);
 467
 468         return -ENODEV;
 469
 470       unbind:
 471         device_remove_file(&tz->device, &pos->attr);
 472         sysfs_remove_link(&tz->device.kobj, pos->name);
 473         release_idr(&tz->idr, &tz->lock, pos->id);
 474         kfree(pos);
 475         return 0;
 476 }
 477
 478 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
 479
 480 static void thermal_release(struct device *dev)
 481 {
 482         struct thermal_zone_device *tz;
 483         struct thermal_cooling_device *cdev;
 484
 485         if (!strncmp(dev->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) {
 486                 tz = to_thermal_zone(dev);
 487                 kfree(tz);
 488         } else {
 489                 cdev = to_cooling_device(dev);
 490                 kfree(cdev);
 491         }
 492 }
 493
 494 static struct class thermal_class = {
 495         .name = "thermal",
 496         .dev_release = thermal_release,
 497 };
 498
 499 /**
 500  * thermal_cooling_device_register - register a new thermal cooling device
 501  * @type:       the thermal cooling device type.
 502  * @devdata:    device private data.
 503  * @ops:                standard thermal cooling devices callbacks.
 504  */
 505 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 506                                                                void *devdata,
 507                                                                struct
 508                                                                thermal_cooling_device_ops
 509                                                                *ops)
 510 {
 511         struct thermal_cooling_device *cdev;
 512         struct thermal_zone_device *pos;
 513         int result;
 514
 515         if (!type)
 516                 return ERR_PTR(-EINVAL);
 517
 518         if (strlen(type) >= THERMAL_NAME_LENGTH)
 519                 return ERR_PTR(-EINVAL);
 520
 521         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 522             !ops->set_cur_state)
 523                 return ERR_PTR(-EINVAL);
 524
 525         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 526         if (!cdev)
 527                 return ERR_PTR(-ENOMEM);
 528
 529         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 530         if (result) {
 531                 kfree(cdev);
 532                 return ERR_PTR(result);
 533         }
 534
 535         strcpy(cdev->type, type);
 536         cdev->ops = ops;
 537         cdev->device.class = &thermal_class;
 538         cdev->devdata = devdata;
 539         sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id);
 540         result = device_register(&cdev->device);
 541         if (result) {
 542                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 543                 kfree(cdev);
 544                 return ERR_PTR(result);
 545         }
 546
 547         /* sys I/F */
 548         result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 549         if (result)
 550                 goto unregister;
 551
 552         result = device_create_file(&cdev->device, &dev_attr_max_state);
 553         if (result)
 554                 goto unregister;
 555
 556         result = device_create_file(&cdev->device, &dev_attr_cur_state);
 557         if (result)
 558                 goto unregister;
 559
 560         mutex_lock(&thermal_list_lock);
 561         list_add(&cdev->node, &thermal_cdev_list);
 562         list_for_each_entry(pos, &thermal_tz_list, node) {
 563                 if (!pos->ops->bind)
 564                         continue;
 565                 result = pos->ops->bind(pos, cdev);
 566                 if (result)
 567                         break;
 568
 569         }
 570         mutex_unlock(&thermal_list_lock);
 571
 572         if (!result)
 573                 return cdev;
 574
 575       unregister:
 576         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 577         device_unregister(&cdev->device);
 578         return ERR_PTR(result);
 579 }
 580
 581 EXPORT_SYMBOL(thermal_cooling_device_register);
 582
 583 /**
 584  * thermal_cooling_device_unregister - removes the registered thermal cooling device
 585  * @cdev:       the thermal cooling device to remove.
 586  *
 587  * thermal_cooling_device_unregister() must be called when the device is no
 588  * longer needed.
 589  */
 590 void thermal_cooling_device_unregister(struct
 591                                        thermal_cooling_device
 592                                        *cdev)
 593 {
 594         struct thermal_zone_device *tz;
 595         struct thermal_cooling_device *pos = NULL;
 596
 597         if (!cdev)
 598                 return;
 599
 600         mutex_lock(&thermal_list_lock);
 601         list_for_each_entry(pos, &thermal_cdev_list, node)
 602             if (pos == cdev)
 603                 break;
 604         if (pos != cdev) {
 605                 /* thermal cooling device not found */
 606                 mutex_unlock(&thermal_list_lock);
 607                 return;
 608         }
 609         list_del(&cdev->node);
 610         list_for_each_entry(tz, &thermal_tz_list, node) {
 611                 if (!tz->ops->unbind)
 612                         continue;
 613                 tz->ops->unbind(tz, cdev);
 614         }
 615         mutex_unlock(&thermal_list_lock);
 616
 617         device_remove_file(&cdev->device, &dev_attr_cdev_type);
 618         device_remove_file(&cdev->device, &dev_attr_max_state);
 619         device_remove_file(&cdev->device, &dev_attr_cur_state);
 620
 621         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 622         device_unregister(&cdev->device);
 623         return;
 624 }
 625
 626 EXPORT_SYMBOL(thermal_cooling_device_unregister);
 627
 628 /**
 629  * thermal_zone_device_register - register a new thermal zone device
 630  * @type:       the thermal zone device type
 631  * @trips:      the number of trip points the thermal zone support
 632  * @devdata:    private device data
 633  * @ops:        standard thermal zone device callbacks
 634  *
 635  * thermal_zone_device_unregister() must be called when the device is no
 636  * longer needed.
 637  */
 638 struct thermal_zone_device *thermal_zone_device_register(char *type,
 639                                                          int trips,
 640                                                          void *devdata, struct
 641                                                          thermal_zone_device_ops
 642                                                          *ops)
 643 {
 644         struct thermal_zone_device *tz;
 645         struct thermal_cooling_device *pos;
 646         int result;
 647         int count;
 648
 649         if (!type)
 650                 return ERR_PTR(-EINVAL);
 651
 652         if (strlen(type) >= THERMAL_NAME_LENGTH)
 653                 return ERR_PTR(-EINVAL);
 654
 655         if (trips > THERMAL_MAX_TRIPS || trips < 0)
 656                 return ERR_PTR(-EINVAL);
 657
 658         if (!ops || !ops->get_temp)
 659                 return ERR_PTR(-EINVAL);
 660
 661         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
 662         if (!tz)
 663                 return ERR_PTR(-ENOMEM);
 664
 665         INIT_LIST_HEAD(&tz->cooling_devices);
 666         idr_init(&tz->idr);
 667         mutex_init(&tz->lock);
 668         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
 669         if (result) {
 670                 kfree(tz);
 671                 return ERR_PTR(result);
 672         }
 673         if (tz->id >= MAX_THERMAL_ZONES) {
 674                 printk(KERN_ERR PREFIX
 675                         "Too many thermal zones\n");
 676                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 677                 kfree(tz);
 678                 return ERR_PTR(-EINVAL);
 679         }
 680
 681         strcpy(tz->type, type);
 682         tz->ops = ops;
 683         tz->device.class = &thermal_class;
 684         tz->devdata = devdata;
 685         tz->trips = trips;
 686         sprintf(tz->device.bus_id, "thermal_zone%d", tz->id);
 687         result = device_register(&tz->device);
 688         if (result) {
 689                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 690                 kfree(tz);
 691                 return ERR_PTR(result);
 692         }
 693
 694         /* hwmon sys I/F */
 695         result = device_create_file(thermal_hwmon,
 696                                         &sensor_attrs[tz->id * 2].dev_attr);
 697         if (result)
 698                 goto unregister;
 699
 700         if (trips > 0) {
 701                 char buf[40];
 702                 result = tz->ops->get_trip_type(tz, 0, buf);
 703                 if (result > 0 && !strcmp(buf, "critical\n")) {
 704                         result = device_create_file(thermal_hwmon,
 705                                         &sensor_attrs[tz->id * 2 + 1].dev_attr);
 706                         if (result)
 707                                 goto unregister;
 708                 }
 709         }
 710
 711         /* sys I/F */
 712         result = device_create_file(&tz->device, &dev_attr_type);
 713         if (result)
 714                 goto unregister;
 715
 716         result = device_create_file(&tz->device, &dev_attr_temp);
 717         if (result)
 718                 goto unregister;
 719
 720         if (ops->get_mode) {
 721                 result = device_create_file(&tz->device, &dev_attr_mode);
 722                 if (result)
 723                         goto unregister;
 724         }
 725
 726         for (count = 0; count < trips; count++) {
 727                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
 728                 if (result)
 729                         goto unregister;
 730         }
 731
 732         mutex_lock(&thermal_list_lock);
 733         list_add_tail(&tz->node, &thermal_tz_list);
 734         if (ops->bind)
 735                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 736                 result = ops->bind(tz, pos);
 737                 if (result)
 738                         break;
 739                 }
 740         mutex_unlock(&thermal_list_lock);
 741
 742         if (!result)
 743                 return tz;
 744
 745       unregister:
 746         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 747         device_unregister(&tz->device);
 748         return ERR_PTR(result);
 749 }
 750
 751 EXPORT_SYMBOL(thermal_zone_device_register);
 752
 753 /**
 754  * thermal_device_unregister - removes the registered thermal zone device
 755  * @tz: the thermal zone device to remove
 756  */
 757 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 758 {
 759         struct thermal_cooling_device *cdev;
 760         struct thermal_zone_device *pos = NULL;
 761         int count;
 762
 763         if (!tz)
 764                 return;
 765
 766         mutex_lock(&thermal_list_lock);
 767         list_for_each_entry(pos, &thermal_tz_list, node)
 768             if (pos == tz)
 769                 break;
 770         if (pos != tz) {
 771                 /* thermal zone device not found */
 772                 mutex_unlock(&thermal_list_lock);
 773                 return;
 774         }
 775         list_del(&tz->node);
 776         if (tz->ops->unbind)
 777                 list_for_each_entry(cdev, &thermal_cdev_list, node)
 778                     tz->ops->unbind(tz, cdev);
 779         mutex_unlock(&thermal_list_lock);
 780
 781         device_remove_file(thermal_hwmon,
 782                                 &sensor_attrs[tz->id * 2].dev_attr);
 783         if (tz->trips > 0) {
 784                 char buf[40];
 785                 if (tz->ops->get_trip_type(tz, 0, buf) > 0)
 786                         if (!strcmp(buf, "critical\n"))
 787                                 device_remove_file(thermal_hwmon,
 788                                 &sensor_attrs[tz->id * 2 + 1].dev_attr);
 789         }
 790
 791         device_remove_file(&tz->device, &dev_attr_type);
 792         device_remove_file(&tz->device, &dev_attr_temp);
 793         if (tz->ops->get_mode)
 794                 device_remove_file(&tz->device, &dev_attr_mode);
 795
 796         for (count = 0; count < tz->trips; count++)
 797                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
 798
 799         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 800         idr_destroy(&tz->idr);
 801         mutex_destroy(&tz->lock);
 802         device_unregister(&tz->device);
 803         return;
 804 }
 805
 806 EXPORT_SYMBOL(thermal_zone_device_unregister);
 807
 808 static void thermal_exit(void)
 809 {
 810         if (thermal_hwmon) {
 811                 device_remove_file(thermal_hwmon, &dev_attr_name);
 812                 hwmon_device_unregister(thermal_hwmon);
 813         }
 814         class_unregister(&thermal_class);
 815         idr_destroy(&thermal_tz_idr);
 816         idr_destroy(&thermal_cdev_idr);
 817         mutex_destroy(&thermal_idr_lock);
 818         mutex_destroy(&thermal_list_lock);
 819 }
 820
 821 static int __init thermal_init(void)
 822 {
 823         int result = 0;
 824
 825         result = class_register(&thermal_class);
 826         if (result) {
 827                 idr_destroy(&thermal_tz_idr);
 828                 idr_destroy(&thermal_cdev_idr);
 829                 mutex_destroy(&thermal_idr_lock);
 830                 mutex_destroy(&thermal_list_lock);
 831         }
 832
 833         thermal_hwmon = hwmon_device_register(NULL);
 834         if (IS_ERR(thermal_hwmon)) {
 835                 result = PTR_ERR(thermal_hwmon);
 836                 thermal_hwmon = NULL;
 837                 printk(KERN_ERR PREFIX
 838                         "unable to register hwmon device\n");
 839                 thermal_exit();
 840                 return result;
 841         }
 842
 843         result = device_create_file(thermal_hwmon, &dev_attr_name);
 844
 845         return result;
 846 }
 847
 848 subsys_initcall(thermal_init);
 849 module_exit(thermal_exit);