services.udev.extraRules = ''
    # BH 2026 Badge start
    ATTRS{idVendor}=="1915", ATTRS{idProduct}=="521f", MODE="660", GROUP="plugdev", TAG+="uaccess"
    # BH 2026 Badge end

    # Instantiate the LSM6DSO on the MCP2221 USB-I2C bridge.
    ACTION=="add", SUBSYSTEM=="i2c", ATTR{name}=="MCP2221 usb-i2c bridge", ATTR{new_device}="lsm6dso 0x6a"

    # Grant the seat user the LSM6DSO buffered interface: the char device readable,
    # and the scan/buffer/trigger sysfs attrs (root:root 0644 by default) writable.
    SUBSYSTEM=="iio", KERNEL=="iio:device*", ATTR{name}=="lsm6dso*", \
      GROUP="input", MODE="0660", \
      RUN+="${pkgs.coreutils}/bin/chgrp -R input /sys%p", \
      RUN+="${pkgs.coreutils}/bin/chmod -R g+rwX /sys%p"'';
''