Here's what you need for a fingerprint reader in Android Marshmallow
 

Google made sure that the Nexus 5X and 6P take advantage of Android Marshmallow's fingerprint reader support, but have you wondered what it'll take to get that digit scanning support in third-party hardware? You don't have to guess any longer. Go...

http://www.engadget.com/2015/10/20/a...-requirements/