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39 lines
1.9 KiB
Plaintext
39 lines
1.9 KiB
Plaintext
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# This file is part of systemd.
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# Description
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#
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# Each node on IEEE 1394 bus has configuration ROM with information for identification. Although the
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# typical content of configuration ROM is defined by 1394 Trading Association, many nodes have own
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# quirks. This database includes supplemental information to unit in the node.
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# Convention
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#
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# One entry has two keys. One is customized key to match a node. Another is for kernel alias to
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# match an unit included in the node.
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#
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# The customized key has two formats according to whether the node has model attribute:
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# - ven0x000000mo0x000000units0x000000:0x000000
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# - ven0x000000units0x000000:0x000000
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#
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# Even when the node has multiple units, the entry should match to one of the units. In the case,
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# the customized key should have wild pattern for units field:
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# - ven0x000000mo0x000000units*0x000000:0x000000*
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# - ven0x000000units*0x000000:0x000000*
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#
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# The hexadecimal digits part of the customized key should be lower-case. Linux FireWire subsystem
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# uses lower-case value for attributes of sysfs node, and systemd-hwdb parses the custom key by
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# case-sensitive way. On the other hand, it parses kernel alias by case-insensitive way.
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#
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# The entry should have some of IEEE1394_UNIT_FUNCTION_XXX environment variables to express function
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# of the unit. The variables are used to decide group owner of special file for character device
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# corresponding to node including the unit. At present, below variables are supported:
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# - IEEE1394_UNIT_FUNCTION_MIDI
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# - For any unit to process MIDI messages. For example, the unit includes AV/C music subunit.
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# - IEEE1394_UNIT_FUNCTION_AUDIO
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# - For any unit to process audio signal. For example, the unit includes AV/C audio subunit.
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# - IEEE1394_UNIT_FUNCTION_VIDEO
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# - For any unit to process video signal.
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#
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# Additionally, ID_VENDOR_FROM_DATABASE and ID_MODEL_FROM_DATABASE environment variables are
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# preferable.
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