Intel Extensible Firmware Interface - Manual (Page 600)

Extensible Firmware Interface Specification
14-60 12/01/02 Version 1.10
Status Code Returned
EFI_SUCCESS The endpoint descriptor was retrieved successfully.
EFI_INVALID_PARAMETER EndpointIndex is not valid.
EFI_INVALID_PARAMETER EndpointDescriptor is NULL .
EFI_NOT_FOUND The endpoint descriptor cannot be found. The device may not be
correctly configured.
Examples
The following code fragment shows how to retrieve all the endpoint descriptors from a
USB controller.
EFI_USB_IO_PROTOCOL *UsbIo;
EFI_USB_INTERFACE_DESCRIPTOR InterfaceDesc;
EFI_USB_ENDPOINT_DESCRIPTOR EndpointDesc;
UINTN
Index;
Status = UsbIo->GetInterfaceDescriptor (
UsbIo,
&InterfaceDesc
);
. . .
for(Index = 0; Index < InterfaceDesc.NumEndpoints; Index++) {
Status = UsbIo->GetEndpointDescriptor(
UsbIo,
Index,
&EndpointDesc
);
. . .
}