mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 00:14:32 +09:00
e2f25ae648
The IIO subsystem exposes a 'label' sysfs file to help userspace better identify its devices [1]. Standardized labels include the sensor type along with its location, including 'accel-base' and 'accel-display'. Most Chrome OS boards have two accelerometers that are indistinguishable except for this label (or a 'location' sysfs file before Linux v6.0), and need different mounting matrix corrections based on their location. Add a udev rule that matches hwdb entries using this label, so we can correct both accelerometers on these devices with hwdb entries. The existing rules and hwdb entries are not modified to keep potential out-of-tree entries working, but new entries in this form will override existing ones. Also add currently standardized labels to parse-hwdb.py. [1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-iio
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.