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-rw-r--r--include/linux/kobject.h10
-rw-r--r--lib/kobject.c29
2 files changed, 39 insertions, 0 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index a6dd669cda9..e694261de90 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -126,6 +126,16 @@ struct kset_uevent_ops {
struct kobj_uevent_env *env);
};
+struct kobj_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count);
+};
+
+extern struct sysfs_ops kobj_sysfs_ops;
+
/**
* struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
*
diff --git a/lib/kobject.c b/lib/kobject.c
index 67c3d38d48f..1c343fe4ba6 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -697,6 +697,35 @@ void kset_init(struct kset * k)
spin_lock_init(&k->list_lock);
}
+/* default kobject attribute operations */
+static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct kobj_attribute *kattr;
+ ssize_t ret = -EIO;
+
+ kattr = container_of(attr, struct kobj_attribute, attr);
+ if (kattr->show)
+ ret = kattr->show(kobj, kattr, buf);
+ return ret;
+}
+
+static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kobj_attribute *kattr;
+ ssize_t ret = -EIO;
+
+ kattr = container_of(attr, struct kobj_attribute, attr);
+ if (kattr->store)
+ ret = kattr->store(kobj, kattr, buf, count);
+ return ret;
+}
+
+struct sysfs_ops kobj_sysfs_ops = {
+ .show = kobj_attr_show,
+ .store = kobj_attr_store,
+};
/**
* kset_add - add a kset object to the hierarchy.