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Yu Watanabe
b8c83187eb
Instead of matching ID_USB_INTERFACES directly in 78-sound-card.rules to identify USB sound cards that also expose a video interface, add a new ID_VIDEO property that is set for devices exposing an interface of class 0e (Video) by the usb-interface hwdb, and match on that. The rules are evaluated for the sound card device, a descendant of the USB device, which does not inherit the properties set by the hwdb lookup done in 50-udev-default.rules.in for the USB device itself. So the lookup is also done in 78-sound-card.rules, right after usb_id has set the properties used to build the key. Only ID_VIDEO is imported there, using --filter=.
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.