I want to create a communication protocol to control any hardware 
device using the sd port as an in/out port. I've been looking 
through the code in 
/openwrt-xburst/build_dir/linux-xburst_qi_lb60/linux-2.6.32.10/driver
s/mmc/,
and i managed to see the commands that the hots (in this 
case the ben nanonote) sends to a sd card while initializing, 
writing and reading it. However, the driver I've been reading is a 
low level code, I need to find the driver that calls the one in the 
file above and tells it the commands to be sent. So, whereabouts is 
the driver I should modify in order to send the commands I desire?

Thank you in advance.
Camilo Diaz