AMD suggests that FSR 4 will eventually be open-sourced, bar the core technology, as part of its 'long term plan'

Technically, that's already happened, as back in August 2025, somebody at AMD accidentally uploaded source code for the ...
GitHub

PH4502C Sensor Arduino Library

This Arduino library provides a convenient and easy-to-use interface for the PH4502C sensor, allowing you to effortlessly integrate it into your Arduino projects. The PH4502C sensor is a ...