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The cros-ec-accel devices report their mounting location by the 'label' sysfs file only since Linux v6.0. With earlier kernels, a nonstandard 'location' file reports this, but slightly differently (lid instead of display) [1]. Add udev rules to import the correct hwdb entries based on this 'location' file for cros-ec-accel devices, so that the base-mounted accel matrix has the correct value for older kernels as well. [1] https://kernel.org/doc/Documentation/ABI/testing/sysfs-bus-iio-cros-ec
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.