USB: add urb->ep

This patch (as943) prepares the way for eliminating urb->pipe by
introducing an endpoint pointer into struct urb.  For now urb->ep
is set by usb_submit_urb() from the pipe value; eventually drivers
will set it themselves and we will remove urb->pipe completely.

The patch also adds new inline routines to retrieve an endpoint
descriptor's number and transfer type, essentially as replacements for
usb_pipeendpoint and usb_pipetype.

usb_submit_urb(), usb_hcd_submit_urb(), and usb_hcd_unlink_urb() are
converted to use the new field and new routines.  Other parts of
usbcore will be converted in later patches.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 4f33a58fa9d1..105e3e9362d0 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -555,6 +555,29 @@ static inline int usb_make_path (struct usb_device *dev, char *buf,
 /*-------------------------------------------------------------------------*/
 
 /**
+ * usb_endpoint_num - get the endpoint's number
+ * @epd: endpoint to be checked
+ *
+ * Returns @epd's number: 0 to 15.
+ */
+static inline int usb_endpoint_num(const struct usb_endpoint_descriptor *epd)
+{
+        return epd->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+}
+
+/**
+ * usb_endpoint_type - get the endpoint's transfer type
+ * @epd: endpoint to be checked
+ *
+ * Returns one of USB_ENDPOINT_XFER_{CONTROL, ISOC, BULK, INT} according
+ * to @epd's transfer type.
+ */
+static inline int usb_endpoint_type(const struct usb_endpoint_descriptor *epd)
+{
+        return epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+}
+
+/**
  * usb_endpoint_dir_in - check if the endpoint has IN direction
  * @epd: endpoint to be checked
  *
@@ -1037,6 +1060,8 @@ typedef void (*usb_complete_t)(struct urb *);
  * @urb_list: For use by current owner of the URB.
  * @anchor_list: membership in the list of an anchor
  * @anchor: to anchor URBs to a common mooring
+ * @ep: Points to the endpoint's data structure.  Will eventually
+ *      replace @pipe.
  * @pipe: Holds endpoint number, direction, type, and more.
  *      Create these values with the eight macros available;
  *      usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
@@ -1212,6 +1237,7 @@ struct urb
         struct list_head anchor_list;   /* the URB may be anchored by the driver */
         struct usb_anchor *anchor;
         struct usb_device *dev;         /* (in) pointer to associated device */
+        struct usb_host_endpoint *ep;   /* (internal) pointer to endpoint struct */
         unsigned int pipe;              /* (in) pipe information */
         int status;                     /* (return) non-ISO status */
         unsigned int transfer_flags;    /* (in) URB_SHORT_NOT_OK | ...*/