drivers/base/class.c

   1 /*
   2  * class.c - basic device class management
   3  *
   4  * Copyright (c) 2002-3 Patrick Mochel
   5  * Copyright (c) 2002-3 Open Source Development Labs
   6  * Copyright (c) 2003-2004 Greg Kroah-Hartman
   7  * Copyright (c) 2003-2004 IBM Corp.
   8  *
   9  * This file is released under the GPLv2
  10  *
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/string.h>
  18 #include <linux/kdev_t.h>
  19 #include <linux/err.h>
  20 #include "base.h"
  21
  22 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
  23 #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
  24
  25 static ssize_t
  26 class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
  27 {
  28         struct class_attribute * class_attr = to_class_attr(attr);
  29         struct class * dc = to_class(kobj);
  30         ssize_t ret = -EIO;
  31
  32         if (class_attr->show)
  33                 ret = class_attr->show(dc, buf);
  34         return ret;
  35 }
  36
  37 static ssize_t
  38 class_attr_store(struct kobject * kobj, struct attribute * attr,
  39                  const char * buf, size_t count)
  40 {
  41         struct class_attribute * class_attr = to_class_attr(attr);
  42         struct class * dc = to_class(kobj);
  43         ssize_t ret = -EIO;
  44
  45         if (class_attr->store)
  46                 ret = class_attr->store(dc, buf, count);
  47         return ret;
  48 }
  49
  50 static void class_release(struct kobject * kobj)
  51 {
  52         struct class *class = to_class(kobj);
  53
  54         pr_debug("class '%s': release.\n", class->name);
  55
  56         if (class->class_release)
  57                 class->class_release(class);
  58         else
  59                 pr_debug("class '%s' does not have a release() function, "
  60                          "be careful\n", class->name);
  61 }
  62
  63 static struct sysfs_ops class_sysfs_ops = {
  64         .show   = class_attr_show,
  65         .store  = class_attr_store,
  66 };
  67
  68 static struct kobj_type ktype_class = {
  69         .sysfs_ops      = &class_sysfs_ops,
  70         .release        = class_release,
  71 };
  72
  73 /* Hotplug events for classes go to the class_obj subsys */
  74 static decl_subsys(class, &ktype_class, NULL);
  75
  76
  77 int class_create_file(struct class * cls, const struct class_attribute * attr)
  78 {
  79         int error;
  80         if (cls) {
  81                 error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr);
  82         } else
  83                 error = -EINVAL;
  84         return error;
  85 }
  86
  87 void class_remove_file(struct class * cls, const struct class_attribute * attr)
  88 {
  89         if (cls)
  90                 sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);
  91 }
  92
  93 struct class * class_get(struct class * cls)
  94 {
  95         if (cls)
  96                 return container_of(subsys_get(&cls->subsys), struct class, subsys);
  97         return NULL;
  98 }
  99
 100 void class_put(struct class * cls)
 101 {
 102         subsys_put(&cls->subsys);
 103 }
 104
 105
 106 static int add_class_attrs(struct class * cls)
 107 {
 108         int i;
 109         int error = 0;
 110
 111         if (cls->class_attrs) {
 112                 for (i = 0; attr_name(cls->class_attrs[i]); i++) {
 113                         error = class_create_file(cls,&cls->class_attrs[i]);
 114                         if (error)
 115                                 goto Err;
 116                 }
 117         }
 118  Done:
 119         return error;
 120  Err:
 121         while (--i >= 0)
 122                 class_remove_file(cls,&cls->class_attrs[i]);
 123         goto Done;
 124 }
 125
 126 static void remove_class_attrs(struct class * cls)
 127 {
 128         int i;
 129
 130         if (cls->class_attrs) {
 131                 for (i = 0; attr_name(cls->class_attrs[i]); i++)
 132                         class_remove_file(cls,&cls->class_attrs[i]);
 133         }
 134 }
 135
 136 int class_register(struct class * cls)
 137 {
 138         int error;
 139
 140         pr_debug("device class '%s': registering\n", cls->name);
 141
 142         INIT_LIST_HEAD(&cls->children);
 143         INIT_LIST_HEAD(&cls->interfaces);
 144         init_MUTEX(&cls->sem);
 145         error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
 146         if (error)
 147                 return error;
 148
 149         subsys_set_kset(cls, class_subsys);
 150
 151         error = subsystem_register(&cls->subsys);
 152         if (!error) {
 153                 error = add_class_attrs(class_get(cls));
 154                 class_put(cls);
 155         }
 156         return error;
 157 }
 158
 159 void class_unregister(struct class * cls)
 160 {
 161         pr_debug("device class '%s': unregistering\n", cls->name);
 162         remove_class_attrs(cls);
 163         subsystem_unregister(&cls->subsys);
 164 }
 165
 166 static void class_create_release(struct class *cls)
 167 {
 168         kfree(cls);
 169 }
 170
 171 static void class_device_create_release(struct class_device *class_dev)
 172 {
 173         kfree(class_dev);
 174 }
 175
 176 /**
 177  * class_create - create a struct class structure
 178  * @owner: pointer to the module that is to "own" this struct class
 179  * @name: pointer to a string for the name of this class.
 180  *
 181  * This is used to create a struct class pointer that can then be used
 182  * in calls to class_device_create().
 183  *
 184  * Note, the pointer created here is to be destroyed when finished by
 185  * making a call to class_destroy().
 186  */
 187 struct class *class_create(struct module *owner, char *name)
 188 {
 189         struct class *cls;
 190         int retval;
 191
 192         cls = kmalloc(sizeof(struct class), GFP_KERNEL);
 193         if (!cls) {
 194                 retval = -ENOMEM;
 195                 goto error;
 196         }
 197         memset(cls, 0x00, sizeof(struct class));
 198
 199         cls->name = name;
 200         cls->owner = owner;
 201         cls->class_release = class_create_release;
 202         cls->release = class_device_create_release;
 203
 204         retval = class_register(cls);
 205         if (retval)
 206                 goto error;
 207
 208         return cls;
 209
 210 error:
 211         kfree(cls);
 212         return ERR_PTR(retval);
 213 }
 214
 215 /**
 216  * class_destroy - destroys a struct class structure
 217  * @cs: pointer to the struct class that is to be destroyed
 218  *
 219  * Note, the pointer to be destroyed must have been created with a call
 220  * to class_create().
 221  */
 222 void class_destroy(struct class *cls)
 223 {
 224         if ((cls == NULL) || (IS_ERR(cls)))
 225                 return;
 226
 227         class_unregister(cls);
 228 }
 229
 230 /* Class Device Stuff */
 231
 232 int class_device_create_file(struct class_device * class_dev,
 233                              const struct class_device_attribute * attr)
 234 {
 235         int error = -EINVAL;
 236         if (class_dev)
 237                 error = sysfs_create_file(&class_dev->kobj, &attr->attr);
 238         return error;
 239 }
 240
 241 void class_device_remove_file(struct class_device * class_dev,
 242                               const struct class_device_attribute * attr)
 243 {
 244         if (class_dev)
 245                 sysfs_remove_file(&class_dev->kobj, &attr->attr);
 246 }
 247
 248 int class_device_create_bin_file(struct class_device *class_dev,
 249                                  struct bin_attribute *attr)
 250 {
 251         int error = -EINVAL;
 252         if (class_dev)
 253                 error = sysfs_create_bin_file(&class_dev->kobj, attr);
 254         return error;
 255 }
 256
 257 void class_device_remove_bin_file(struct class_device *class_dev,
 258                                   struct bin_attribute *attr)
 259 {
 260         if (class_dev)
 261                 sysfs_remove_bin_file(&class_dev->kobj, attr);
 262 }
 263
 264 static ssize_t
 265 class_device_attr_show(struct kobject * kobj, struct attribute * attr,
 266                        char * buf)
 267 {
 268         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
 269         struct class_device * cd = to_class_dev(kobj);
 270         ssize_t ret = 0;
 271
 272         if (class_dev_attr->show)
 273                 ret = class_dev_attr->show(cd, buf);
 274         return ret;
 275 }
 276
 277 static ssize_t
 278 class_device_attr_store(struct kobject * kobj, struct attribute * attr,
 279                         const char * buf, size_t count)
 280 {
 281         struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
 282         struct class_device * cd = to_class_dev(kobj);
 283         ssize_t ret = 0;
 284
 285         if (class_dev_attr->store)
 286                 ret = class_dev_attr->store(cd, buf, count);
 287         return ret;
 288 }
 289
 290 static struct sysfs_ops class_dev_sysfs_ops = {
 291         .show   = class_device_attr_show,
 292         .store  = class_device_attr_store,
 293 };
 294
 295 static void class_dev_release(struct kobject * kobj)
 296 {
 297         struct class_device *cd = to_class_dev(kobj);
 298         struct class * cls = cd->class;
 299
 300         pr_debug("device class '%s': release.\n", cd->class_id);
 301
 302         if (cls->release)
 303                 cls->release(cd);
 304         else {
 305                 printk(KERN_ERR "Device class '%s' does not have a release() function, "
 306                         "it is broken and must be fixed.\n",
 307                         cd->class_id);
 308                 WARN_ON(1);
 309         }
 310 }
 311
 312 static struct kobj_type ktype_class_device = {
 313         .sysfs_ops      = &class_dev_sysfs_ops,
 314         .release        = class_dev_release,
 315 };
 316
 317 static int class_hotplug_filter(struct kset *kset, struct kobject *kobj)
 318 {
 319         struct kobj_type *ktype = get_ktype(kobj);
 320
 321         if (ktype == &ktype_class_device) {
 322                 struct class_device *class_dev = to_class_dev(kobj);
 323                 if (class_dev->class)
 324                         return 1;
 325         }
 326         return 0;
 327 }
 328
 329 static const char *class_hotplug_name(struct kset *kset, struct kobject *kobj)
 330 {
 331         struct class_device *class_dev = to_class_dev(kobj);
 332
 333         return class_dev->class->name;
 334 }
 335
 336 static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
 337                          int num_envp, char *buffer, int buffer_size)
 338 {
 339         struct class_device *class_dev = to_class_dev(kobj);
 340         int i = 0;
 341         int length = 0;
 342         int retval = 0;
 343
 344         pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
 345
 346         if (class_dev->dev) {
 347                 /* add physical device, backing this device  */
 348                 struct device *dev = class_dev->dev;
 349                 char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
 350
 351                 add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
 352                                     &length, "PHYSDEVPATH=%s", path);
 353                 kfree(path);
 354
 355                 if (dev->bus)
 356                         add_hotplug_env_var(envp, num_envp, &i,
 357                                             buffer, buffer_size, &length,
 358                                             "PHYSDEVBUS=%s", dev->bus->name);
 359
 360                 if (dev->driver)
 361                         add_hotplug_env_var(envp, num_envp, &i,
 362                                             buffer, buffer_size, &length,
 363                                             "PHYSDEVDRIVER=%s", dev->driver->name);
 364         }
 365
 366         if (MAJOR(class_dev->devt)) {
 367                 add_hotplug_env_var(envp, num_envp, &i,
 368                                     buffer, buffer_size, &length,
 369                                     "MAJOR=%u", MAJOR(class_dev->devt));
 370
 371                 add_hotplug_env_var(envp, num_envp, &i,
 372                                     buffer, buffer_size, &length,
 373                                     "MINOR=%u", MINOR(class_dev->devt));
 374         }
 375
 376         /* terminate, set to next free slot, shrink available space */
 377         envp[i] = NULL;
 378         envp = &envp[i];
 379         num_envp -= i;
 380         buffer = &buffer[length];
 381         buffer_size -= length;
 382
 383         if (class_dev->class->hotplug) {
 384                 /* have the bus specific function add its stuff */
 385                 retval = class_dev->class->hotplug (class_dev, envp, num_envp,
 386                                                     buffer, buffer_size);
 387                         if (retval) {
 388                         pr_debug ("%s - hotplug() returned %d\n",
 389                                   __FUNCTION__, retval);
 390                 }
 391         }
 392
 393         return retval;
 394 }
 395
 396 static struct kset_hotplug_ops class_hotplug_ops = {
 397         .filter =       class_hotplug_filter,
 398         .name =         class_hotplug_name,
 399         .hotplug =      class_hotplug,
 400 };
 401
 402 static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops);
 403
 404
 405 static int class_device_add_attrs(struct class_device * cd)
 406 {
 407         int i;
 408         int error = 0;
 409         struct class * cls = cd->class;
 410
 411         if (cls->class_dev_attrs) {
 412                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
 413                         error = class_device_create_file(cd,
 414                                                          &cls->class_dev_attrs[i]);
 415                         if (error)
 416                                 goto Err;
 417                 }
 418         }
 419  Done:
 420         return error;
 421  Err:
 422         while (--i >= 0)
 423                 class_device_remove_file(cd,&cls->class_dev_attrs[i]);
 424         goto Done;
 425 }
 426
 427 static void class_device_remove_attrs(struct class_device * cd)
 428 {
 429         int i;
 430         struct class * cls = cd->class;
 431
 432         if (cls->class_dev_attrs) {
 433                 for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
 434                         class_device_remove_file(cd,&cls->class_dev_attrs[i]);
 435         }
 436 }
 437
 438 static ssize_t show_dev(struct class_device *class_dev, char *buf)
 439 {
 440         return print_dev_t(buf, class_dev->devt);
 441 }
 442
 443 void class_device_initialize(struct class_device *class_dev)
 444 {
 445         kobj_set_kset_s(class_dev, class_obj_subsys);
 446         kobject_init(&class_dev->kobj);
 447         INIT_LIST_HEAD(&class_dev->node);
 448 }
 449
 450 int class_device_add(struct class_device *class_dev)
 451 {
 452         struct class * parent = NULL;
 453         struct class_interface * class_intf;
 454         int error;
 455
 456         class_dev = class_device_get(class_dev);
 457         if (!class_dev)
 458                 return -EINVAL;
 459
 460         if (!strlen(class_dev->class_id)) {
 461                 error = -EINVAL;
 462                 goto register_done;
 463         }
 464
 465         parent = class_get(class_dev->class);
 466
 467         pr_debug("CLASS: registering class device: ID = '%s'\n",
 468                  class_dev->class_id);
 469
 470         /* first, register with generic layer. */
 471         kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
 472         if (parent)
 473                 class_dev->kobj.parent = &parent->subsys.kset.kobj;
 474
 475         if ((error = kobject_add(&class_dev->kobj)))
 476                 goto register_done;
 477
 478         /* add the needed attributes to this device */
 479         if (MAJOR(class_dev->devt)) {
 480                 struct class_device_attribute *attr;
 481                 attr = kmalloc(sizeof(*attr), GFP_KERNEL);
 482                 if (!attr) {
 483                         error = -ENOMEM;
 484                         kobject_del(&class_dev->kobj);
 485                         goto register_done;
 486                 }
 487                 memset(attr, sizeof(*attr), 0x00);
 488                 attr->attr.name = "dev";
 489                 attr->attr.mode = S_IRUGO;
 490                 attr->attr.owner = parent->owner;
 491                 attr->show = show_dev;
 492                 attr->store = NULL;
 493                 class_device_create_file(class_dev, attr);
 494                 class_dev->devt_attr = attr;
 495         }
 496
 497         class_device_add_attrs(class_dev);
 498         if (class_dev->dev)
 499                 sysfs_create_link(&class_dev->kobj,
 500                                   &class_dev->dev->kobj, "device");
 501
 502         /* notify any interfaces this device is now here */
 503         if (parent) {
 504                 down(&parent->sem);
 505                 list_add_tail(&class_dev->node, &parent->children);
 506                 list_for_each_entry(class_intf, &parent->interfaces, node)
 507                         if (class_intf->add)
 508                                 class_intf->add(class_dev);
 509                 up(&parent->sem);
 510         }
 511         kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
 512
 513  register_done:
 514         if (error && parent)
 515                 class_put(parent);
 516         class_device_put(class_dev);
 517         return error;
 518 }
 519
 520 int class_device_register(struct class_device *class_dev)
 521 {
 522         class_device_initialize(class_dev);
 523         return class_device_add(class_dev);
 524 }
 525
 526 /**
 527  * class_device_create - creates a class device and registers it with sysfs
 528  * @cs: pointer to the struct class that this device should be registered to.
 529  * @dev: the dev_t for the char device to be added.
 530  * @device: a pointer to a struct device that is assiociated with this class device.
 531  * @fmt: string for the class device's name
 532  *
 533  * This function can be used by char device classes.  A struct
 534  * class_device will be created in sysfs, registered to the specified
 535  * class.  A "dev" file will be created, showing the dev_t for the
 536  * device.  The pointer to the struct class_device will be returned from
 537  * the call.  Any further sysfs files that might be required can be
 538  * created using this pointer.
 539  *
 540  * Note: the struct class passed to this function must have previously
 541  * been created with a call to class_create().
 542  */
 543 struct class_device *class_device_create(struct class *cls, dev_t devt,
 544                                          struct device *device, char *fmt, ...)
 545 {
 546         va_list args;
 547         struct class_device *class_dev = NULL;
 548         int retval = -ENODEV;
 549
 550         if (cls == NULL || IS_ERR(cls))
 551                 goto error;
 552
 553         class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
 554         if (!class_dev) {
 555                 retval = -ENOMEM;
 556                 goto error;
 557         }
 558         memset(class_dev, 0x00, sizeof(struct class_device));
 559
 560         class_dev->devt = devt;
 561         class_dev->dev = device;
 562         class_dev->class = cls;
 563
 564         va_start(args, fmt);
 565         vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
 566         va_end(args);
 567         retval = class_device_register(class_dev);
 568         if (retval)
 569                 goto error;
 570
 571         return class_dev;
 572
 573 error:
 574         kfree(class_dev);
 575         return ERR_PTR(retval);
 576 }
 577
 578 void class_device_del(struct class_device *class_dev)
 579 {
 580         struct class * parent = class_dev->class;
 581         struct class_interface * class_intf;
 582
 583         if (parent) {
 584                 down(&parent->sem);
 585                 list_del_init(&class_dev->node);
 586                 list_for_each_entry(class_intf, &parent->interfaces, node)
 587                         if (class_intf->remove)
 588                                 class_intf->remove(class_dev);
 589                 up(&parent->sem);
 590         }
 591
 592         if (class_dev->dev)
 593                 sysfs_remove_link(&class_dev->kobj, "device");
 594         if (class_dev->devt_attr) {
 595                 class_device_remove_file(class_dev, class_dev->devt_attr);
 596                 kfree(class_dev->devt_attr);
 597                 class_dev->devt_attr = NULL;
 598         }
 599         class_device_remove_attrs(class_dev);
 600
 601         kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE);
 602         kobject_del(&class_dev->kobj);
 603
 604         if (parent)
 605                 class_put(parent);
 606 }
 607
 608 void class_device_unregister(struct class_device *class_dev)
 609 {
 610         pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
 611                  class_dev->class_id);
 612         class_device_del(class_dev);
 613         class_device_put(class_dev);
 614 }
 615
 616 /**
 617  * class_device_destroy - removes a class device that was created with class_device_create()
 618  * @cls: the pointer to the struct class that this device was registered * with.
 619  * @dev: the dev_t of the device that was previously registered.
 620  *
 621  * This call unregisters and cleans up a class device that was created with a
 622  * call to class_device_create()
 623  */
 624 void class_device_destroy(struct class *cls, dev_t devt)
 625 {
 626         struct class_device *class_dev = NULL;
 627         struct class_device *class_dev_tmp;
 628
 629         down(&cls->sem);
 630         list_for_each_entry(class_dev_tmp, &cls->children, node) {
 631                 if (class_dev_tmp->devt == devt) {
 632                         class_dev = class_dev_tmp;
 633                         break;
 634                 }
 635         }
 636         up(&cls->sem);
 637
 638         if (class_dev)
 639                 class_device_unregister(class_dev);
 640 }
 641
 642 int class_device_rename(struct class_device *class_dev, char *new_name)
 643 {
 644         int error = 0;
 645
 646         class_dev = class_device_get(class_dev);
 647         if (!class_dev)
 648                 return -EINVAL;
 649
 650         pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
 651                  new_name);
 652
 653         strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
 654
 655         error = kobject_rename(&class_dev->kobj, new_name);
 656
 657         class_device_put(class_dev);
 658
 659         return error;
 660 }
 661
 662 struct class_device * class_device_get(struct class_device *class_dev)
 663 {
 664         if (class_dev)
 665                 return to_class_dev(kobject_get(&class_dev->kobj));
 666         return NULL;
 667 }
 668
 669 void class_device_put(struct class_device *class_dev)
 670 {
 671         kobject_put(&class_dev->kobj);
 672 }
 673
 674
 675 int class_interface_register(struct class_interface *class_intf)
 676 {
 677         struct class *parent;
 678         struct class_device *class_dev;
 679
 680         if (!class_intf || !class_intf->class)
 681                 return -ENODEV;
 682
 683         parent = class_get(class_intf->class);
 684         if (!parent)
 685                 return -EINVAL;
 686
 687         down(&parent->sem);
 688         list_add_tail(&class_intf->node, &parent->interfaces);
 689         if (class_intf->add) {
 690                 list_for_each_entry(class_dev, &parent->children, node)
 691                         class_intf->add(class_dev);
 692         }
 693         up(&parent->sem);
 694
 695         return 0;
 696 }
 697
 698 void class_interface_unregister(struct class_interface *class_intf)
 699 {
 700         struct class * parent = class_intf->class;
 701         struct class_device *class_dev;
 702
 703         if (!parent)
 704                 return;
 705
 706         down(&parent->sem);
 707         list_del_init(&class_intf->node);
 708         if (class_intf->remove) {
 709                 list_for_each_entry(class_dev, &parent->children, node)
 710                         class_intf->remove(class_dev);
 711         }
 712         up(&parent->sem);
 713
 714         class_put(parent);
 715 }
 716
 717
 718
 719 int __init classes_init(void)
 720 {
 721         int retval;
 722
 723         retval = subsystem_register(&class_subsys);
 724         if (retval)
 725                 return retval;
 726
 727         /* ick, this is ugly, the things we go through to keep from showing up
 728          * in sysfs... */
 729         subsystem_init(&class_obj_subsys);
 730         if (!class_obj_subsys.kset.subsys)
 731                         class_obj_subsys.kset.subsys = &class_obj_subsys;
 732         return 0;
 733 }
 734
 735 EXPORT_SYMBOL_GPL(class_create_file);
 736 EXPORT_SYMBOL_GPL(class_remove_file);
 737 EXPORT_SYMBOL_GPL(class_register);
 738 EXPORT_SYMBOL_GPL(class_unregister);
 739 EXPORT_SYMBOL_GPL(class_get);
 740 EXPORT_SYMBOL_GPL(class_put);
 741 EXPORT_SYMBOL_GPL(class_create);
 742 EXPORT_SYMBOL_GPL(class_destroy);
 743
 744 EXPORT_SYMBOL_GPL(class_device_register);
 745 EXPORT_SYMBOL_GPL(class_device_unregister);
 746 EXPORT_SYMBOL_GPL(class_device_initialize);
 747 EXPORT_SYMBOL_GPL(class_device_add);
 748 EXPORT_SYMBOL_GPL(class_device_del);
 749 EXPORT_SYMBOL_GPL(class_device_get);
 750 EXPORT_SYMBOL_GPL(class_device_put);
 751 EXPORT_SYMBOL_GPL(class_device_create);
 752 EXPORT_SYMBOL_GPL(class_device_destroy);
 753 EXPORT_SYMBOL_GPL(class_device_create_file);
 754 EXPORT_SYMBOL_GPL(class_device_remove_file);
 755 EXPORT_SYMBOL_GPL(class_device_create_bin_file);
 756 EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
 757
 758 EXPORT_SYMBOL_GPL(class_interface_register);
 759 EXPORT_SYMBOL_GPL(class_interface_unregister);