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Recently the kernel has gotten support for reading the mount-matrix for BMA250 sensors represented by a BOSC0200 ACPI device from the ACPI tables, so that we don't need to add quirks for these. At least that was the theory. The Chuwi Hi13 (CWI534) with BMA250 sensor has the sensor mounted such that it works / needs the normal(ized) matrix, but the ACPI tables actually contain a wrong matrix inverting the X and Y axis. Add a quirk to override /sys/bus/iio/devices/iio:device?/in_mount_matrix with the norm-matrix, since the ACPI derived matrix is actually wrong on these devices (sigh)
Files in this directory specify a description of hardware devices, in the form of mappings from modalias-like keys (which identify specific hardware devices) to udev properties. Files in this directory are not read by udev directly. Instead, man:systemd-hwdb(8) compiles them into a binary database. See man:hwdb(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of the udev daemon. Use 'systemd-analyze cat-config udev/hwdb.d' to display the effective config.