Where to start learning for writing driver for devices and capacitive screen?

I am expecting some work in near future related to capacitive screen devices, there we have to write the software for capacitive touch screen. Please guide me how to start for that , and also how t开发者_运维技巧o learn writing driver software for a hardware in general like a modem , usb etc

I read a bunch of chapters from Linux Device Drivers some time ago. It's a good book licensed under Creative Common license that explains how to write different kinds of device drivers. I only used it to know about concurrency in the kernel, block and network drivers but you could find it interesting.