RTL8187 coverage class

I'm trying to implement a first go at getting coverage class working for a Realtek RTL8187L chip similar to the way it is in ath5k. I know I need to change the ack timeout and the slot times but I can't quite decipher the register use. I can see some hints in the function rtl8187_conf_erp but that doesn't seem enough.

It seems that the values for SLOT, DIFS and EIFS aren't directly converted to microseconds, so I'm not sure how those values were arrived at.

I want to start by just hard coding some different initial values to allow for testing. My test device right now is an Alfa AWUS036H which is a high power USB (500mW claimed) RTL8187L and testing at a range of about 2 kilometers, making the coverage class=5.

Gus

Those values come from the vendor driver where they are not explained. The difference between short and long slot values may be instructive.

Larry