How to switch driver from wireless extension to cfg/mac80211

Hi, after cutting away a lot of dead code from the rtl8192e I would like to understand the way forward to migrate the driver from wireless extension to cfg/mac80211. What is the best way forward to migrate the driver rtl8192e towards the drivers/net/wireless/realtek/rtlwifi/rtl8192* ? Does it have to be a hard cut? What to start with? - start to change the used structs towards ieee80211_hw? Thanks for your support. Bye Philipp