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