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eaf6cbe099
This adds bi-directional (host->device, device->host) volume/mute support to the f_uac2 driver by adding Feature Units and interrupt endpoint. Currently only master channel is supported. Volume and mute are configurable through configfs, by default volume has -100..0 dB range with 1 dB step. Similar to existing flexible endpoints configuration, Feature Unit won't be added to the topology if both mute and volume are not enabled, also interrupt endpoint isn't added to the device if no feature unit is present Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com> Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com> Link: https://lore.kernel.org/r/20210712125529.76070-4-pavel.hofman@ivitera.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
26 lines
1.1 KiB
Text
26 lines
1.1 KiB
Text
What: /config/usb-gadget/gadget/functions/uac2.name
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Date: Sep 2014
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KernelVersion: 3.18
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Description:
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The attributes:
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========= ============================
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c_chmask capture channel mask
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c_srate capture sampling rate
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c_ssize capture sample size (bytes)
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c_sync capture synchronization type (async/adaptive)
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c_mute_present capture mute control enable
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c_volume_present capture volume control enable
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c_volume_min capture volume control min value (in 1/256 dB)
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c_volume_max capture volume control max value (in 1/256 dB)
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c_volume_res capture volume control resolution (in 1/256 dB)
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fb_max maximum extra bandwidth in async mode
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p_chmask playback channel mask
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p_srate playback sampling rate
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p_ssize playback sample size (bytes)
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p_mute_present playback mute control enable
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p_volume_present playback volume control enable
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p_volume_min playback volume control min value (in 1/256 dB)
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p_volume_max playback volume control max value (in 1/256 dB)
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p_volume_res playback volume control resolution (in 1/256 dB)
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========= ============================
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