Commit 670dd90d authored by Shaohua Li's avatar Shaohua Li Committed by Greg Kroah-Hartman
Browse files

[PATCH] Driver Core: Allow sysdev_class have attributes 



allow sysdev_class adding attribute. Next patch will use the new API to
add an attribute under /sys/device/system/cpu/.

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1740757e

drivers/base/sys.c

+50 −1
Original line number Diff line number Diff line
@@ -80,10 +80,59 @@ void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a) 
EXPORT_SYMBOL_GPL(sysdev_create_file);

EXPORT_SYMBOL_GPL(sysdev_remove_file);



#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)

#define to_sysdev_class_attr(a) container_of(a, \

	struct sysdev_class_attribute, attr)



static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,

				 char *buffer)

{

	struct sysdev_class * class = to_sysdev_class(kobj);

	struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);



	if (class_attr->show)

		return class_attr->show(class, buffer);

	return -EIO;

}



static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,

				  const char *buffer, size_t count)

{

	struct sysdev_class * class = to_sysdev_class(kobj);

	struct sysdev_class_attribute * class_attr = to_sysdev_class_attr(attr);



	if (class_attr->store)

		return class_attr->store(class, buffer, count);

	return -EIO;

}



static struct sysfs_ops sysfs_class_ops = {

	.show	= sysdev_class_show,

	.store	= sysdev_class_store,

};



static struct kobj_type ktype_sysdev_class = {

	.sysfs_ops	= &sysfs_class_ops,

};



int sysdev_class_create_file(struct sysdev_class *c,

			     struct sysdev_class_attribute *a)

{

	return sysfs_create_file(&c->kset.kobj, &a->attr);

}

EXPORT_SYMBOL_GPL(sysdev_class_create_file);



void sysdev_class_remove_file(struct sysdev_class *c,

			      struct sysdev_class_attribute *a)

{

	sysfs_remove_file(&c->kset.kobj, &a->attr);

}

EXPORT_SYMBOL_GPL(sysdev_class_remove_file);



/*

 * declare system_subsys

 */

static decl_subsys(system, &ktype_sysdev, NULL);

static decl_subsys(system, &ktype_sysdev_class, NULL);



int sysdev_class_register(struct sysdev_class * cls)

{

include/linux/sysdev.h

+17 −1
Original line number Diff line number Diff line
@@ -37,11 +37,27 @@ struct sysdev_class { 
	struct kset		kset;

};



struct sysdev_class_attribute {

	struct attribute attr;

	ssize_t (*show)(struct sysdev_class *, char *);

	ssize_t (*store)(struct sysdev_class *, const char *, size_t);

};



#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) 		\

struct sysdev_class_attribute attr_##_name = { 			\

	.attr = {.name = __stringify(_name), .mode = _mode },	\

	.show	= _show,					\

	.store	= _store,					\

};





extern int sysdev_class_register(struct sysdev_class *);

extern void sysdev_class_unregister(struct sysdev_class *);





extern int sysdev_class_create_file(struct sysdev_class *,

	struct sysdev_class_attribute *);

extern void sysdev_class_remove_file(struct sysdev_class *,

	struct sysdev_class_attribute *);

/**

 * Auxillary system device drivers.

 */