ACTION=="remove", GOTO="mlinux_end"
SUBSYSTEM!="tty", GOTO="mlinux_end"
KERNEL!="ttyUSB[0-9]*|ttyACM[0-9]*|ttyXRUSB[0-9]*|ttyS*", GOTO="mlinux_end"

SUBSYSTEMS=="usb", ENV{ID_IFACE}="$attr{bInterfaceNumber}"
ENV{ID_IFACE}=="", GOTO="mlinux_end"

# mtre: external serial on exar chip
ATTRS{idVendor}=="04e2", ATTRS{idProduct}=="1412", ENV{ID_IFACE}=="02", SYMLINK+="ext_serial"

LABEL="mlinux_end"