post_install() {
  dkms_install $1
}

pre_upgrade() {
  dkms_remove $2
}

post_upgrade() {
  dkms_install $1
}

pre_remove() {
  dkms_remove $1
}

dkms_remove() {
  # In case a different version is installed, use "dkms status broadcom-wl"
  # to list and remove installed versions.

  if [ -n "$(dkms status -m broadcom-wl-248 -v ${1%%-*})" ]; then
    dkms remove -m broadcom-wl-248 -v ${1%%-*} --all || return 1
  fi
}

dkms_install() {
  dkms install -m broadcom-wl-248 -v ${1%%-*} || return 1

  cat << EOF || return 1

To load the new module, execute:

  for m in b43 b43legacy ssb bcm43xx brcm80211 brcmfmac brcmsmac bcma wl; do
    sudo modprobe -r \$m   # "not found" errors are normal
  done
  sudo modprobe wl

or just reboot the system.
EOF
}