libusbhost: add usb_endpoint_get_device()

Change-Id: Ibe4ce0551faca5d2d8bec0fbd21315a393b9f208
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/include/usbhost/usbhost.h b/include/usbhost/usbhost.h
index 29b6ea3..c2387e5 100644
--- a/include/usbhost/usbhost.h
+++ b/include/usbhost/usbhost.h
@@ -126,6 +126,9 @@
 /* Cancels a pending usb_endpoint_queue() operation on an endpoint. */
 int usb_endpoint_cancel(struct usb_endpoint *ep);
 
+/* Returns the usb_device for the given endpoint */
+struct usb_device *usb_endpoint_get_device(struct usb_endpoint *ep);
+
 /* Returns the endpoint address for the given endpoint */
 int usb_endpoint_number(struct usb_endpoint *ep);
 
diff --git a/libusbhost/usbhost.c b/libusbhost/usbhost.c
index d2eaf0c..3604a42 100644
--- a/libusbhost/usbhost.c
+++ b/libusbhost/usbhost.c
@@ -444,6 +444,11 @@
     return ioctl(ep->dev->fd, USBDEVFS_DISCARDURB, &ep->urb);
 }
 
+struct usb_device *usb_endpoint_get_device(struct usb_endpoint *ep)
+{
+    return ep->dev;
+}
+
 int usb_endpoint_number(struct usb_endpoint *ep)
 {
     return ep->desc.bEndpointAddress;