For those interessted, the linux kernel pages describes quite well what needs to be considered to achieve this (and other work)

http://wireless.kernel.org/en/users/Drivers/wl12xx

For one, if we want to implement the open source drivers, it *seems* two firmware blobs for station and accespoint modes, plus, the sdio seems not supported anymore (eg on our 2.6.32 kernel) - a good reason to try to change this