2 files changed, 39 insertions, 0 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index a6dd669cda9d..e694261de90f 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 67c3d38d48f0..1c343fe4ba63 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.