USB GADGET/PERIPHERAL: g_file_storage Bulk-Only Transport compliance

Gadget can tell controller driver to ignore Clear-Feature(HALT_ENDPOINT)
This API change enables future support for Bulk-Only Transport compliance

Signed-off-by: David Lopo <lopo.david@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index d8128f7102c92858bc01d71c7544882849318ae7..cf468fbdbf8e80b504ecb3ac1d798120c066ca2f 100644 (file)
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -114,6 +114,8 @@ struct usb_ep_ops {
        int (*dequeue) (struct usb_ep *ep, struct usb_request *req);
 
        int (*set_halt) (struct usb_ep *ep, int value);
+       int (*set_wedge) (struct usb_ep *ep);
+
        int (*fifo_status) (struct usb_ep *ep);
        void (*fifo_flush) (struct usb_ep *ep);
 };
@@ -348,6 +350,25 @@ static inline int usb_ep_clear_halt(struct usb_ep *ep)
        return ep->ops->set_halt(ep, 0);
 }
 
+/**
+ * usb_ep_set_wedge - sets the halt feature and ignores clear requests
+ * @ep: the endpoint being wedged
+ *
+ * Use this to stall an endpoint and ignore CLEAR_FEATURE(HALT_ENDPOINT)
+ * requests. If the gadget driver clears the halt status, it will
+ * automatically unwedge the endpoint.
+ *
+ * Returns zero on success, else negative errno.
+ */
+static inline int
+usb_ep_set_wedge(struct usb_ep *ep)
+{
+       if (ep->ops->set_wedge)
+               return ep->ops->set_wedge(ep);
+       else
+               return ep->ops->set_halt(ep, 1);
+}
+
 /**
  * usb_ep_fifo_status - returns number of bytes in fifo, or error
  * @ep: the endpoint whose fifo status is being checked.