What is a good uart input driver module to start with?

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Hello Linux input users,

I have an embedded system for which I would like to write an input driver.

The device is a CPLD connected to a uart on my system, with several buttons
that I would like to represent as keyboard keys, as well as two arrays of 
input pins that are treated as axes. 

We have a working user space driver, which uses but it suffers from very high 
latency when the system is under load.

I have read Documentation/input.txt and input-programming.txt.
I'm just trying not to reinvent the wheel when it comes to a serial device 
with a non-standard way of expressing keys.

-- 
Joshua Clayton
Software Engineer
UniWest
122 S. 4th Avenue
Pasco, WA 99301
(509) 544-0720
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