Steam will soon natively support PlayStation 4 controllers
 

While it's been possible to link a DualShock 4 to a PC to play Steam games, the functionality has been provided by third-party apps, not the companies themselves. Luckily, that will soon change, after Valve's Jeff Bellinghausen confirmed to Gamasutra...

https://www.engadget.com/2016/10/13/...ation-support/