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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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6
src/drivers/bus/usb.c
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@@ -451,9 +451,11 @@ int usb_message ( struct usb_endpoint *ep, unsigned int request,
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v terminate Terminate using a short packet
* @ret rc Return status code
*/
int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf ) {
int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int terminate ) {
struct usb_device *usb = ep->usb;
struct usb_port *port = usb->port;
int rc;
@@ -467,7 +469,7 @@ int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf ) {
return rc;
/* Enqueue stream transfer */
if ( ( rc = ep->host->stream ( ep, iobuf ) ) != 0 ) {
if ( ( rc = ep->host->stream ( ep, iobuf, terminate ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not enqueue stream transfer: %s\n",
usb->name, usb_endpoint_name ( ep->address ),
strerror ( rc ) );