The driver software for Windows OS can be downloaded from our product page at https://www.sony.net/Products/felica/business/products/RC-S380.html.
We also provide reference implementation SDK named Basic Suite (ICS-D101/V16) https://www.sony.net/Products/felica/business/products/ICS-D101.html, which includes sample implementation and drivers in source code to port any environments (e.g. Linux). Please send us your inquiry via the FeliCa web form.