[RFC v5 1/3] usb: composite: add make_group and add_function operations

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Using configfs to create/configure a usb gadget requires
providing a method to create config group for a usb function
and a wrapper for usb_add_function.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
 include/linux/usb/composite.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index e84c754..cfd9209 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -39,6 +39,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/log2.h>
+#include <linux/configfs.h>
 
 /*
  * USB function drivers should return USB_GADGET_DELAYED_STATUS if they
@@ -147,6 +148,11 @@ struct usb_function {
 	 * Related:  unbind() may kfree() but bind() won't...
 	 */
 
+	struct config_group *(*make_group)(struct config_group *parent,
+					   const char *name);
+	int (*add_function)(struct usb_configuration *c, struct usb_function *f,
+			    struct config_item *item, void *data);
+
 	/* configuration management:  bind/unbind */
 	int			(*bind)(struct usb_configuration *,
 					struct usb_function *);
-- 
1.7.0.4

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