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[usb] Allow usb_stream() to enforce a terminating short packet

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Some USB endpoints require that a short packet be used to terminate
transfers, since they have no other way to determine message
boundaries.  If the message length happens to be an exact multiple of
the USB packet size, then this requires the use of an additional
zero-length packet.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-02-10 13:45:57 +00:00
parent 17aceb34da
commit 58c3e7f747
5 changed files with 28 additions and 14 deletions
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8
src/include/ipxe/usb.h
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@@ -428,10 +428,11 @@ struct usb_endpoint_host_operations {
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v terminate Terminate using a short packet
* @ret rc Return status code
*/
int ( * stream ) ( struct usb_endpoint *ep,
struct io_buffer *iobuf );
int ( * stream ) ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int terminate );
};
/** USB endpoint driver operations */
@@ -547,7 +548,8 @@ extern void usb_endpoint_close ( struct usb_endpoint *ep );
extern int usb_message ( struct usb_endpoint *ep, unsigned int request,
unsigned int value, unsigned int index,
struct io_buffer *iobuf );
extern int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf );
extern int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int terminate );
extern void usb_complete_err ( struct usb_endpoint *ep,
struct io_buffer *iobuf, int rc );