2 * class.c - basic device class management
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.
9 * This file is released under the GPLv2
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/string.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
22 extern struct subsystem devices_subsys
;
24 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
25 #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
28 class_attr_show(struct kobject
* kobj
, struct attribute
* attr
, char * buf
)
30 struct class_attribute
* class_attr
= to_class_attr(attr
);
31 struct class * dc
= to_class(kobj
);
35 ret
= class_attr
->show(dc
, buf
);
40 class_attr_store(struct kobject
* kobj
, struct attribute
* attr
,
41 const char * buf
, size_t count
)
43 struct class_attribute
* class_attr
= to_class_attr(attr
);
44 struct class * dc
= to_class(kobj
);
47 if (class_attr
->store
)
48 ret
= class_attr
->store(dc
, buf
, count
);
52 static void class_release(struct kobject
* kobj
)
54 struct class *class = to_class(kobj
);
56 pr_debug("class '%s': release.\n", class->name
);
58 if (class->class_release
)
59 class->class_release(class);
61 pr_debug("class '%s' does not have a release() function, "
62 "be careful\n", class->name
);
65 static struct sysfs_ops class_sysfs_ops
= {
66 .show
= class_attr_show
,
67 .store
= class_attr_store
,
70 static struct kobj_type ktype_class
= {
71 .sysfs_ops
= &class_sysfs_ops
,
72 .release
= class_release
,
75 /* Hotplug events for classes go to the class_obj subsys */
76 static decl_subsys(class, &ktype_class
, NULL
);
79 int class_create_file(struct class * cls
, const struct class_attribute
* attr
)
83 error
= sysfs_create_file(&cls
->subsys
.kset
.kobj
, &attr
->attr
);
89 void class_remove_file(struct class * cls
, const struct class_attribute
* attr
)
92 sysfs_remove_file(&cls
->subsys
.kset
.kobj
, &attr
->attr
);
95 static struct class *class_get(struct class *cls
)
98 return container_of(subsys_get(&cls
->subsys
), struct class, subsys
);
102 static void class_put(struct class * cls
)
105 subsys_put(&cls
->subsys
);
109 static int add_class_attrs(struct class * cls
)
114 if (cls
->class_attrs
) {
115 for (i
= 0; attr_name(cls
->class_attrs
[i
]); i
++) {
116 error
= class_create_file(cls
,&cls
->class_attrs
[i
]);
125 class_remove_file(cls
,&cls
->class_attrs
[i
]);
129 static void remove_class_attrs(struct class * cls
)
133 if (cls
->class_attrs
) {
134 for (i
= 0; attr_name(cls
->class_attrs
[i
]); i
++)
135 class_remove_file(cls
,&cls
->class_attrs
[i
]);
139 int class_register(struct class * cls
)
143 pr_debug("device class '%s': registering\n", cls
->name
);
145 INIT_LIST_HEAD(&cls
->children
);
146 INIT_LIST_HEAD(&cls
->devices
);
147 INIT_LIST_HEAD(&cls
->interfaces
);
148 init_MUTEX(&cls
->sem
);
149 error
= kobject_set_name(&cls
->subsys
.kset
.kobj
, "%s", cls
->name
);
153 subsys_set_kset(cls
, class_subsys
);
155 error
= subsystem_register(&cls
->subsys
);
157 error
= add_class_attrs(class_get(cls
));
163 void class_unregister(struct class * cls
)
165 pr_debug("device class '%s': unregistering\n", cls
->name
);
166 remove_class_attrs(cls
);
167 subsystem_unregister(&cls
->subsys
);
170 static void class_create_release(struct class *cls
)
172 pr_debug("%s called for %s\n", __FUNCTION__
, cls
->name
);
176 static void class_device_create_release(struct class_device
*class_dev
)
178 pr_debug("%s called for %s\n", __FUNCTION__
, class_dev
->class_id
);
182 /* needed to allow these devices to have parent class devices */
183 static int class_device_create_uevent(struct class_device
*class_dev
,
184 char **envp
, int num_envp
,
185 char *buffer
, int buffer_size
)
187 pr_debug("%s called for %s\n", __FUNCTION__
, class_dev
->class_id
);
192 * class_create - create a struct class structure
193 * @owner: pointer to the module that is to "own" this struct class
194 * @name: pointer to a string for the name of this class.
196 * This is used to create a struct class pointer that can then be used
197 * in calls to class_device_create().
199 * Note, the pointer created here is to be destroyed when finished by
200 * making a call to class_destroy().
202 struct class *class_create(struct module
*owner
, const char *name
)
207 cls
= kzalloc(sizeof(*cls
), GFP_KERNEL
);
215 cls
->class_release
= class_create_release
;
216 cls
->release
= class_device_create_release
;
218 retval
= class_register(cls
);
226 return ERR_PTR(retval
);
230 * class_destroy - destroys a struct class structure
231 * @cls: pointer to the struct class that is to be destroyed
233 * Note, the pointer to be destroyed must have been created with a call
236 void class_destroy(struct class *cls
)
238 if ((cls
== NULL
) || (IS_ERR(cls
)))
241 class_unregister(cls
);
244 /* Class Device Stuff */
246 int class_device_create_file(struct class_device
* class_dev
,
247 const struct class_device_attribute
* attr
)
251 error
= sysfs_create_file(&class_dev
->kobj
, &attr
->attr
);
255 void class_device_remove_file(struct class_device
* class_dev
,
256 const struct class_device_attribute
* attr
)
259 sysfs_remove_file(&class_dev
->kobj
, &attr
->attr
);
262 int class_device_create_bin_file(struct class_device
*class_dev
,
263 struct bin_attribute
*attr
)
267 error
= sysfs_create_bin_file(&class_dev
->kobj
, attr
);
271 void class_device_remove_bin_file(struct class_device
*class_dev
,
272 struct bin_attribute
*attr
)
275 sysfs_remove_bin_file(&class_dev
->kobj
, attr
);
279 class_device_attr_show(struct kobject
* kobj
, struct attribute
* attr
,
282 struct class_device_attribute
* class_dev_attr
= to_class_dev_attr(attr
);
283 struct class_device
* cd
= to_class_dev(kobj
);
286 if (class_dev_attr
->show
)
287 ret
= class_dev_attr
->show(cd
, buf
);
292 class_device_attr_store(struct kobject
* kobj
, struct attribute
* attr
,
293 const char * buf
, size_t count
)
295 struct class_device_attribute
* class_dev_attr
= to_class_dev_attr(attr
);
296 struct class_device
* cd
= to_class_dev(kobj
);
299 if (class_dev_attr
->store
)
300 ret
= class_dev_attr
->store(cd
, buf
, count
);
304 static struct sysfs_ops class_dev_sysfs_ops
= {
305 .show
= class_device_attr_show
,
306 .store
= class_device_attr_store
,
309 static void class_dev_release(struct kobject
* kobj
)
311 struct class_device
*cd
= to_class_dev(kobj
);
312 struct class * cls
= cd
->class;
314 pr_debug("device class '%s': release.\n", cd
->class_id
);
316 kfree(cd
->devt_attr
);
317 cd
->devt_attr
= NULL
;
321 else if (cls
->release
)
324 printk(KERN_ERR
"Class Device '%s' does not have a release() function, "
325 "it is broken and must be fixed.\n",
331 static struct kobj_type ktype_class_device
= {
332 .sysfs_ops
= &class_dev_sysfs_ops
,
333 .release
= class_dev_release
,
336 static int class_uevent_filter(struct kset
*kset
, struct kobject
*kobj
)
338 struct kobj_type
*ktype
= get_ktype(kobj
);
340 if (ktype
== &ktype_class_device
) {
341 struct class_device
*class_dev
= to_class_dev(kobj
);
342 if (class_dev
->class)
348 static const char *class_uevent_name(struct kset
*kset
, struct kobject
*kobj
)
350 struct class_device
*class_dev
= to_class_dev(kobj
);
352 return class_dev
->class->name
;
355 static int class_uevent(struct kset
*kset
, struct kobject
*kobj
, char **envp
,
356 int num_envp
, char *buffer
, int buffer_size
)
358 struct class_device
*class_dev
= to_class_dev(kobj
);
363 pr_debug("%s - name = %s\n", __FUNCTION__
, class_dev
->class_id
);
365 if (class_dev
->dev
) {
366 /* add device, backing this class device (deprecated) */
367 struct device
*dev
= class_dev
->dev
;
368 char *path
= kobject_get_path(&dev
->kobj
, GFP_KERNEL
);
370 add_uevent_var(envp
, num_envp
, &i
, buffer
, buffer_size
,
371 &length
, "PHYSDEVPATH=%s", path
);
375 add_uevent_var(envp
, num_envp
, &i
,
376 buffer
, buffer_size
, &length
,
377 "PHYSDEVBUS=%s", dev
->bus
->name
);
380 add_uevent_var(envp
, num_envp
, &i
,
381 buffer
, buffer_size
, &length
,
382 "PHYSDEVDRIVER=%s", dev
->driver
->name
);
385 if (MAJOR(class_dev
->devt
)) {
386 add_uevent_var(envp
, num_envp
, &i
,
387 buffer
, buffer_size
, &length
,
388 "MAJOR=%u", MAJOR(class_dev
->devt
));
390 add_uevent_var(envp
, num_envp
, &i
,
391 buffer
, buffer_size
, &length
,
392 "MINOR=%u", MINOR(class_dev
->devt
));
395 /* terminate, set to next free slot, shrink available space */
399 buffer
= &buffer
[length
];
400 buffer_size
-= length
;
402 if (class_dev
->uevent
) {
403 /* have the class device specific function add its stuff */
404 retval
= class_dev
->uevent(class_dev
, envp
, num_envp
,
405 buffer
, buffer_size
);
407 pr_debug("class_dev->uevent() returned %d\n", retval
);
408 } else if (class_dev
->class->uevent
) {
409 /* have the class specific function add its stuff */
410 retval
= class_dev
->class->uevent(class_dev
, envp
, num_envp
,
411 buffer
, buffer_size
);
413 pr_debug("class->uevent() returned %d\n", retval
);
419 static struct kset_uevent_ops class_uevent_ops
= {
420 .filter
= class_uevent_filter
,
421 .name
= class_uevent_name
,
422 .uevent
= class_uevent
,
425 static decl_subsys(class_obj
, &ktype_class_device
, &class_uevent_ops
);
428 static int class_device_add_attrs(struct class_device
* cd
)
432 struct class * cls
= cd
->class;
434 if (cls
->class_dev_attrs
) {
435 for (i
= 0; attr_name(cls
->class_dev_attrs
[i
]); i
++) {
436 error
= class_device_create_file(cd
,
437 &cls
->class_dev_attrs
[i
]);
446 class_device_remove_file(cd
,&cls
->class_dev_attrs
[i
]);
450 static void class_device_remove_attrs(struct class_device
* cd
)
453 struct class * cls
= cd
->class;
455 if (cls
->class_dev_attrs
) {
456 for (i
= 0; attr_name(cls
->class_dev_attrs
[i
]); i
++)
457 class_device_remove_file(cd
,&cls
->class_dev_attrs
[i
]);
461 static int class_device_add_groups(struct class_device
* cd
)
467 for (i
= 0; cd
->groups
[i
]; i
++) {
468 error
= sysfs_create_group(&cd
->kobj
, cd
->groups
[i
]);
471 sysfs_remove_group(&cd
->kobj
, cd
->groups
[i
]);
480 static void class_device_remove_groups(struct class_device
* cd
)
484 for (i
= 0; cd
->groups
[i
]; i
++) {
485 sysfs_remove_group(&cd
->kobj
, cd
->groups
[i
]);
490 static ssize_t
show_dev(struct class_device
*class_dev
, char *buf
)
492 return print_dev_t(buf
, class_dev
->devt
);
495 static ssize_t
store_uevent(struct class_device
*class_dev
,
496 const char *buf
, size_t count
)
498 kobject_uevent(&class_dev
->kobj
, KOBJ_ADD
);
502 void class_device_initialize(struct class_device
*class_dev
)
504 kobj_set_kset_s(class_dev
, class_obj_subsys
);
505 kobject_init(&class_dev
->kobj
);
506 INIT_LIST_HEAD(&class_dev
->node
);
509 char *make_class_name(const char *name
, struct kobject
*kobj
)
514 size
= strlen(name
) + strlen(kobject_name(kobj
)) + 2;
516 class_name
= kmalloc(size
, GFP_KERNEL
);
518 return ERR_PTR(-ENOMEM
);
520 strcpy(class_name
, name
);
521 strcat(class_name
, ":");
522 strcat(class_name
, kobject_name(kobj
));
526 int class_device_add(struct class_device
*class_dev
)
528 struct class *parent_class
= NULL
;
529 struct class_device
*parent_class_dev
= NULL
;
530 struct class_interface
*class_intf
;
531 char *class_name
= NULL
;
534 class_dev
= class_device_get(class_dev
);
538 if (!strlen(class_dev
->class_id
))
541 parent_class
= class_get(class_dev
->class);
545 parent_class_dev
= class_device_get(class_dev
->parent
);
547 pr_debug("CLASS: registering class device: ID = '%s'\n",
548 class_dev
->class_id
);
550 /* first, register with generic layer. */
551 error
= kobject_set_name(&class_dev
->kobj
, "%s", class_dev
->class_id
);
555 if (parent_class_dev
)
556 class_dev
->kobj
.parent
= &parent_class_dev
->kobj
;
558 class_dev
->kobj
.parent
= &parent_class
->subsys
.kset
.kobj
;
560 error
= kobject_add(&class_dev
->kobj
);
564 /* add the needed attributes to this device */
565 error
= sysfs_create_link(&class_dev
->kobj
,
566 &parent_class
->subsys
.kset
.kobj
, "subsystem");
569 class_dev
->uevent_attr
.attr
.name
= "uevent";
570 class_dev
->uevent_attr
.attr
.mode
= S_IWUSR
;
571 class_dev
->uevent_attr
.attr
.owner
= parent_class
->owner
;
572 class_dev
->uevent_attr
.store
= store_uevent
;
573 error
= class_device_create_file(class_dev
, &class_dev
->uevent_attr
);
577 if (MAJOR(class_dev
->devt
)) {
578 struct class_device_attribute
*attr
;
579 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
584 attr
->attr
.name
= "dev";
585 attr
->attr
.mode
= S_IRUGO
;
586 attr
->attr
.owner
= parent_class
->owner
;
587 attr
->show
= show_dev
;
588 error
= class_device_create_file(class_dev
, attr
);
594 class_dev
->devt_attr
= attr
;
597 error
= class_device_add_attrs(class_dev
);
601 if (class_dev
->dev
) {
602 class_name
= make_class_name(class_dev
->class->name
,
604 error
= sysfs_create_link(&class_dev
->kobj
,
605 &class_dev
->dev
->kobj
, "device");
608 error
= sysfs_create_link(&class_dev
->dev
->kobj
, &class_dev
->kobj
,
614 error
= class_device_add_groups(class_dev
);
618 kobject_uevent(&class_dev
->kobj
, KOBJ_ADD
);
620 /* notify any interfaces this device is now here */
621 down(&parent_class
->sem
);
622 list_add_tail(&class_dev
->node
, &parent_class
->children
);
623 list_for_each_entry(class_intf
, &parent_class
->interfaces
, node
) {
625 class_intf
->add(class_dev
, class_intf
);
627 up(&parent_class
->sem
);
633 sysfs_remove_link(&class_dev
->kobj
, class_name
);
636 sysfs_remove_link(&class_dev
->kobj
, "device");
638 class_device_remove_attrs(class_dev
);
640 if (class_dev
->devt_attr
)
641 class_device_remove_file(class_dev
, class_dev
->devt_attr
);
643 class_device_remove_file(class_dev
, &class_dev
->uevent_attr
);
645 kobject_del(&class_dev
->kobj
);
648 class_device_put(parent_class_dev
);
649 class_put(parent_class
);
651 class_device_put(class_dev
);
656 int class_device_register(struct class_device
*class_dev
)
658 class_device_initialize(class_dev
);
659 return class_device_add(class_dev
);
663 * class_device_create - creates a class device and registers it with sysfs
664 * @cls: pointer to the struct class that this device should be registered to.
665 * @parent: pointer to the parent struct class_device of this new device, if any.
666 * @devt: the dev_t for the char device to be added.
667 * @device: a pointer to a struct device that is assiociated with this class device.
668 * @fmt: string for the class device's name
670 * This function can be used by char device classes. A struct
671 * class_device will be created in sysfs, registered to the specified
673 * A "dev" file will be created, showing the dev_t for the device, if
674 * the dev_t is not 0,0.
675 * If a pointer to a parent struct class_device is passed in, the newly
676 * created struct class_device will be a child of that device in sysfs.
677 * The pointer to the struct class_device will be returned from the
678 * call. Any further sysfs files that might be required can be created
679 * using this pointer.
681 * Note: the struct class passed to this function must have previously
682 * been created with a call to class_create().
684 struct class_device
*class_device_create(struct class *cls
,
685 struct class_device
*parent
,
687 struct device
*device
,
688 const char *fmt
, ...)
691 struct class_device
*class_dev
= NULL
;
692 int retval
= -ENODEV
;
694 if (cls
== NULL
|| IS_ERR(cls
))
697 class_dev
= kzalloc(sizeof(*class_dev
), GFP_KERNEL
);
703 class_dev
->devt
= devt
;
704 class_dev
->dev
= device
;
705 class_dev
->class = cls
;
706 class_dev
->parent
= parent
;
707 class_dev
->release
= class_device_create_release
;
708 class_dev
->uevent
= class_device_create_uevent
;
711 vsnprintf(class_dev
->class_id
, BUS_ID_SIZE
, fmt
, args
);
713 retval
= class_device_register(class_dev
);
721 return ERR_PTR(retval
);
724 void class_device_del(struct class_device
*class_dev
)
726 struct class *parent_class
= class_dev
->class;
727 struct class_device
*parent_device
= class_dev
->parent
;
728 struct class_interface
*class_intf
;
729 char *class_name
= NULL
;
732 down(&parent_class
->sem
);
733 list_del_init(&class_dev
->node
);
734 list_for_each_entry(class_intf
, &parent_class
->interfaces
, node
)
735 if (class_intf
->remove
)
736 class_intf
->remove(class_dev
, class_intf
);
737 up(&parent_class
->sem
);
740 if (class_dev
->dev
) {
741 class_name
= make_class_name(class_dev
->class->name
,
743 sysfs_remove_link(&class_dev
->kobj
, "device");
744 sysfs_remove_link(&class_dev
->dev
->kobj
, class_name
);
746 sysfs_remove_link(&class_dev
->kobj
, "subsystem");
747 class_device_remove_file(class_dev
, &class_dev
->uevent_attr
);
748 if (class_dev
->devt_attr
)
749 class_device_remove_file(class_dev
, class_dev
->devt_attr
);
750 class_device_remove_attrs(class_dev
);
751 class_device_remove_groups(class_dev
);
753 kobject_uevent(&class_dev
->kobj
, KOBJ_REMOVE
);
754 kobject_del(&class_dev
->kobj
);
756 class_device_put(parent_device
);
757 class_put(parent_class
);
761 void class_device_unregister(struct class_device
*class_dev
)
763 pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
764 class_dev
->class_id
);
765 class_device_del(class_dev
);
766 class_device_put(class_dev
);
770 * class_device_destroy - removes a class device that was created with class_device_create()
771 * @cls: the pointer to the struct class that this device was registered * with.
772 * @devt: the dev_t of the device that was previously registered.
774 * This call unregisters and cleans up a class device that was created with a
775 * call to class_device_create()
777 void class_device_destroy(struct class *cls
, dev_t devt
)
779 struct class_device
*class_dev
= NULL
;
780 struct class_device
*class_dev_tmp
;
783 list_for_each_entry(class_dev_tmp
, &cls
->children
, node
) {
784 if (class_dev_tmp
->devt
== devt
) {
785 class_dev
= class_dev_tmp
;
792 class_device_unregister(class_dev
);
795 int class_device_rename(struct class_device
*class_dev
, char *new_name
)
798 char *old_class_name
= NULL
, *new_class_name
= NULL
;
800 class_dev
= class_device_get(class_dev
);
804 pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev
->class_id
,
808 old_class_name
= make_class_name(class_dev
->class->name
,
811 strlcpy(class_dev
->class_id
, new_name
, KOBJ_NAME_LEN
);
813 error
= kobject_rename(&class_dev
->kobj
, new_name
);
815 if (class_dev
->dev
) {
816 new_class_name
= make_class_name(class_dev
->class->name
,
818 sysfs_create_link(&class_dev
->dev
->kobj
, &class_dev
->kobj
,
820 sysfs_remove_link(&class_dev
->dev
->kobj
, old_class_name
);
822 class_device_put(class_dev
);
824 kfree(old_class_name
);
825 kfree(new_class_name
);
830 struct class_device
* class_device_get(struct class_device
*class_dev
)
833 return to_class_dev(kobject_get(&class_dev
->kobj
));
837 void class_device_put(struct class_device
*class_dev
)
840 kobject_put(&class_dev
->kobj
);
844 int class_interface_register(struct class_interface
*class_intf
)
846 struct class *parent
;
847 struct class_device
*class_dev
;
850 if (!class_intf
|| !class_intf
->class)
853 parent
= class_get(class_intf
->class);
858 list_add_tail(&class_intf
->node
, &parent
->interfaces
);
859 if (class_intf
->add
) {
860 list_for_each_entry(class_dev
, &parent
->children
, node
)
861 class_intf
->add(class_dev
, class_intf
);
863 if (class_intf
->add_dev
) {
864 list_for_each_entry(dev
, &parent
->devices
, node
)
865 class_intf
->add_dev(dev
, class_intf
);
872 void class_interface_unregister(struct class_interface
*class_intf
)
874 struct class * parent
= class_intf
->class;
875 struct class_device
*class_dev
;
882 list_del_init(&class_intf
->node
);
883 if (class_intf
->remove
) {
884 list_for_each_entry(class_dev
, &parent
->children
, node
)
885 class_intf
->remove(class_dev
, class_intf
);
887 if (class_intf
->remove_dev
) {
888 list_for_each_entry(dev
, &parent
->devices
, node
)
889 class_intf
->remove_dev(dev
, class_intf
);
896 int virtual_device_parent(struct device
*dev
)
901 if (!dev
->class->virtual_dir
) {
902 static struct kobject
*virtual_dir
= NULL
;
905 virtual_dir
= kobject_add_dir(&devices_subsys
.kset
.kobj
, "virtual");
906 dev
->class->virtual_dir
= kobject_add_dir(virtual_dir
, dev
->class->name
);
909 dev
->kobj
.parent
= dev
->class->virtual_dir
;
913 int __init
classes_init(void)
917 retval
= subsystem_register(&class_subsys
);
921 /* ick, this is ugly, the things we go through to keep from showing up
923 subsystem_init(&class_obj_subsys
);
924 if (!class_obj_subsys
.kset
.subsys
)
925 class_obj_subsys
.kset
.subsys
= &class_obj_subsys
;
929 EXPORT_SYMBOL_GPL(class_create_file
);
930 EXPORT_SYMBOL_GPL(class_remove_file
);
931 EXPORT_SYMBOL_GPL(class_register
);
932 EXPORT_SYMBOL_GPL(class_unregister
);
933 EXPORT_SYMBOL_GPL(class_create
);
934 EXPORT_SYMBOL_GPL(class_destroy
);
936 EXPORT_SYMBOL_GPL(class_device_register
);
937 EXPORT_SYMBOL_GPL(class_device_unregister
);
938 EXPORT_SYMBOL_GPL(class_device_initialize
);
939 EXPORT_SYMBOL_GPL(class_device_add
);
940 EXPORT_SYMBOL_GPL(class_device_del
);
941 EXPORT_SYMBOL_GPL(class_device_get
);
942 EXPORT_SYMBOL_GPL(class_device_put
);
943 EXPORT_SYMBOL_GPL(class_device_create
);
944 EXPORT_SYMBOL_GPL(class_device_destroy
);
945 EXPORT_SYMBOL_GPL(class_device_create_file
);
946 EXPORT_SYMBOL_GPL(class_device_remove_file
);
947 EXPORT_SYMBOL_GPL(class_device_create_bin_file
);
948 EXPORT_SYMBOL_GPL(class_device_remove_bin_file
);
950 EXPORT_SYMBOL_GPL(class_interface_register
);
951 EXPORT_SYMBOL_GPL(class_interface_unregister
);