Driver core: create devices/virtual/ tree

This change creates a devices/virtual/CLASS_NAME tree for struct devices
that belong to a class, yet do not have a "real" struct device for a
parent.  It automatically creates the directories on the fly as needed.


Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
index e078bc21d52e..cbdf47c0c60d 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -19,6 +19,8 @@
 #include <linux/slab.h>
 #include "base.h"
 
+extern struct subsystem devices_subsys;
+
 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
 #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
 
@@ -878,7 +880,22 @@ void class_interface_unregister(struct class_interface *class_intf)
         class_put(parent);
 }
 
+int virtual_device_parent(struct device *dev)
+{
+        if (!dev->class)
+                return -ENODEV;
+
+        if (!dev->class->virtual_dir) {
+                static struct kobject *virtual_dir = NULL;
 
+                if (!virtual_dir)
+                        virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
+                dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
+        }
+
+        dev->kobj.parent = dev->class->virtual_dir;
+        return 0;
+}
 
 int __init classes_init(void)
 {