[i2c] I2C/SMbus driver for VT8251 southbridge based keypad

[Seetaram, Tekkalkot (IE10)]

Hi All,

I would like to write a Linux driver for a keypad, interfaced to VT8251
Southbridge (i2c/SMBus) interface. The VT8251 sits on VIA X86
motherboard.
I have Linux 2.6.11.12 kernel running on this board. Basically I need to
write a Linux driver to capture the keystrokes.

Now my questions are

1. Whether any such driver already exists In Linux 2.6?

2. When I browsed the /usr/src/linux-2,6/drivers/i2c, I saw lot of
different drivers like bus driver, chip driver, algo driver, core driver
and protocol driver etc. Let me know what all I can re-use for my
requirement and what I need to write from scratch?

3. What all technical details I need to write this keypad driver?

4. Can I know the structure of Linux I2c driver (How it is organized) ?

Thanks
Seetaram