How to write a keyboard driver?

How to write a keyboard driver with interrupt driven? the platform is ARM and the interface is SRAMC with I/O mapped. What should my handler and read fucntions contains? and I want to know how to map the memory by using the ioremap() function? when exactly we have to use mmap()can you please help me out with some kinda psuedo code.
warm regards,
Ravi Kulkarni

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