diff options
| author | Ruslan Bilovol <ruslan.bilovol@gmail.com> | 2021-07-12 14:55:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 10:10:11 +0200 |
| commit | eaf6cbe0992052a46d93047dc122fad5126aa3bd (patch) | |
| tree | 7afba51916030445da028021e828c3fed9549364 /Documentation/usb | |
| parent | usb: gadget: u_audio: add bi-directional volume and mute support (diff) | |
| download | linux-eaf6cbe0992052a46d93047dc122fad5126aa3bd.tar.xz linux-eaf6cbe0992052a46d93047dc122fad5126aa3bd.zip | |
usb: gadget: f_uac2: add volume and mute support
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>
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/gadget-testing.rst | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst index 9d6276f82774..272e51f17f54 100644 --- a/Documentation/usb/gadget-testing.rst +++ b/Documentation/usb/gadget-testing.rst @@ -729,10 +729,20 @@ The uac2 function provides these attributes in its function directory: c_srate capture sampling rate c_ssize capture sample size (bytes) c_sync capture synchronization type (async/adaptive) - fb_max maximum extra bandwidth in async mode + c_mute_present capture mute control enable + c_volume_present capture volume control enable + c_volume_min capture volume control min value (in 1/256 dB) + c_volume_max capture volume control max value (in 1/256 dB) + c_volume_res capture volume control resolution (in 1/256 dB) + fb_max maximum extra bandwidth in async mode p_chmask playback channel mask p_srate playback sampling rate p_ssize playback sample size (bytes) + p_mute_present playback mute control enable + p_volume_present playback volume control enable + p_volume_min playback volume control min value (in 1/256 dB) + p_volume_max playback volume control max value (in 1/256 dB) + p_volume_res playback volume control resolution (in 1/256 dB) req_number the number of pre-allocated request for both capture and playback =============== ==================================================== |