Hi there. For some time, our small team has been working on drivers for Bitmain devices, including the 'Antminer L3+', 'Antminer S19xpHydro', 'Antminer S21', as well as the APW-11 and APW-17 power supplies.
None of this was brought to a final production-ready state, but some parts do actually work. In the end, we decided to publish everything under the GPL license - just in case some parts of this project might be useful or interesting to the community. Here is the link:
https://github.com/Alex20129/cgminer