post_install() {
  # lpr
  /opt/brother/Printers/dcpt520w/inf/setupPrintcapij dcpt520w -i
  
  # cupswrapper
  /opt/brother/Printers/dcpt520w/cupswrapper/cupswrapperdcpt520w
  
  systemctl restart org.cups.cups.service
}

post_upgrade() {
  /bin/true
}

pre_remove() {
  # lpr
  /opt/brother/Printers/dcpt520w/inf/setupPrintcapij dcpt520w -e
  
  # cupswrapper
  /opt/brother/Printers/dcpt520w/cupswrapper/cupswrapperdcpt520w -e
}

op=$1
shift

$op "$@"