USB: Add usb_endpoint_xfer_control to usb.h

Added a function to check if an endpoint is a control endpoint.
There were similar functions for bulk, interrupt, and isoc,
but not for control endpoints.

Signed-off-by: Sarah Bailey <saharabeara@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 3cb9285..1c56386 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -557,6 +557,18 @@ static inline int usb_endpoint_xfer_bulk(const struct usb_endpoint_descriptor *e
 }
 
 /**
+ * usb_endpoint_xfer_control - check if the endpoint has control transfer type
+ * @epd: endpoint to be checked
+ *
+ * Returns true if the endpoint is of type control, otherwise it returns false.
+ */
+static inline int usb_endpoint_xfer_control(const struct usb_endpoint_descriptor *epd)
+{
+       return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
+               USB_ENDPOINT_XFER_CONTROL);
+}
+
+/**
  * usb_endpoint_xfer_int - check if the endpoint has interrupt transfer type
  * @epd: endpoint to be checked
  *