I have a non-usb finger print reader based on UART and I am trying to interface it to my computer.
Basically when the system is booted and is running I can send serial data to my finger print reader and get a reply typically an authentication of a finger print back. I have the device specification and I am communicating with the device by using termios and my problem is I want to do this in the login-screen.
So, my Idea is to run a custom program while the system is at login screen to communicate with my device and get the authentication back. The device stores the fingerprint templates on board and just sends an authentication packet back.
Any suggestions to make this happen at login screen would benefit me.