Mine

%post
if [ $1 -eq 1 ]; then
# Blacklist ath5k
  echo "blacklist ath5k" >> /etc/modprobe.d/blacklist
fi

%preun
if [ $1 -eq 0 ]; then
# Disable driver on final removal
  sed -i '/blacklist ath5k/d' /etc/modprobe.d/blacklist &>/dev/null
fi