kobject_add
kobject_add(&class->kobj, &linux_class_root, class->name);
kobject_add(&dev->kobj, &dev->class->kobj, dev_name(dev));
kobject_add(&dev->kobj, &dev->class->kobj, dev_name(dev));
int kobject_add(struct kobject *kobj, struct kobject *parent,
if (kobject_add(kobj, parent, "%s", name) == 0)