Intel Extensible Firmware Interface - Manual (Page 589)

Protocols — USB Support
Version 1.10 12/01/02 14-49
Description
This function allows a USB device driver to communicate with a USB device through a
synchronous interrupt transfer. The
UsbSyncInterruptTransfer() differs from
UsbAsyncInterruptTransfer() described in the previous section in that it is a blocking
transfer request. The caller must wait for the function return, either successfully or unsuccessfully.
Status Code Returned
EFI_SUCCESS The sync interrupt transfer has been successfully executed.
EFI_INVALID_PARAMETER The parameter DeviceEndpoint is not valid.
EFI_INVALID_PARAMETER Data is NULL.
EFI_INVALID_PARAMETER DataLength is NULL .
EFI_INVALID_PARAMETER Status is NULL .
EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
EFI_TIMEOUT The transfer cannot be completed within Timeout timeframe.
EFI_DEVICE_ERROR The transfer failed other than timeout, and the transfer status is returned
in
Status .