Dear @TJO
We do have the driver source code, but actually never used it, and we don’t know the state of theses sources.
I can offer you to build the driver for WEC2013 “as is” (assuming that it builds without problems). However, this is probably not enough for you in the long run.
Therefore I would rather recommend you to use one of the LAN chips we assemble on our modules, such as the Asix AX88772B. There we have drivers that are well tested and established, which leads to a much more stable software environment for you.
Regards, Andy