good example of a tty driver

[Kumar Gala]

Alan,

Can you point me at any good drivers to use as an example of using the  
tty layer.  I'm trying to get an out of tree driver brought up to date  
for the Avocent ESP-16 MI Serial Hubs (serial over ethernet):

http://www.connectivity.avocent.com/products/network-based/esp_16.asp

Thankfully the have a GPL driver but it was last updated against 2.6.23:

http://www.connectivity.avocent.com/drivers/esp_serial_hubs/dd64e069.asp

However I've never worked on any tty drivers so its a bit black magic  
at this point.  I was hoping that an example would at least get me  
able to bring the driver up to a point that we can get it into the  
staging tree.

thanks

- k
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