chromeos-base/chromeos-base/files/udev-rules/99-powerd-sx9310.rules

ACTION=="add", SUBSYSTEM=="iio", ATTR{name}=="sx9310|sx9311", \
ATTR{label}=="proximity-*" \
  SYMLINK+="%s{label}" \
  GROUP="power", \
  ATTR{events/in_proximity1_thresh_either_en}="1"