[alsa-devel] [PATCH 4/4] ALSA: usb: add UAC3 BADD profiles support

[Ruslan Bilovol]

On Thu, Apr 19, 2018 at 12:42 PM, Andrew Chant <achant at google.com> wrote:
> On Sat, Apr 14, 2018 at 6:24 AM, Ruslan Bilovol
> <ruslan.bilovol at gmail.com> wrote:
>> Recently released USB Audio Class 3.0 specification
>> contains BADD (Basic Audio Device Definition) document
>> which describes pre-defined UAC3 configurations.
>>
>> BADD support is mandatory for UAC3 devices, it should be
>> implemented as a separate USB device configuration.
>> As per BADD document, class-specific descriptors
>> shall not be included in the Device’s Configuration
>> descriptor ("inferred"), but host can guess them
>> from BADD profile number, number of endpoints and
>> their max packed sizes.
>>
>> This patch adds support of all BADD profiles from the spec
>>
>> Signed-off-by: Ruslan Bilovol <ruslan.bilovol at gmail.com>
>> ---
>>  sound/usb/card.c       |  14 +++
>>  sound/usb/clock.c      |   9 +-
>>  sound/usb/mixer.c      | 313 +++++++++++++++++++++++++++++++++++++++++++++++--
>>  sound/usb/mixer_maps.c |  65 ++++++++++
>>  sound/usb/stream.c     |  83 +++++++++++--
>>  sound/usb/usbaudio.h   |   2 +
>>  6 files changed, 466 insertions(+), 20 deletions(-)
>
>> --- a/sound/usb/mixer_maps.c
>> +++ b/sound/usb/mixer_maps.c
>> @@ -482,3 +482,68 @@ struct usbmix_ctl_map {
>>         { 0 } /* terminator */
>>  };
>>
>> +/*
>> + * Control map entries for UAC3 BADD profiles
>> + */
>> +
>> +static struct usbmix_name_map uac3_badd_generic_io_map[] = {
>> +       { UAC3_BADD_FU_ID2, "Generic Out Playback" },
>> +       { UAC3_BADD_FU_ID5, "Generic In Capture" },
>> +       { 0 }                                   /* terminator */
>> +};
>> +static struct usbmix_name_map uac3_badd_headphone_map[] = {
>> +       { UAC3_BADD_FU_ID2, "Headphone Playback" },
>> +       { 0 }                                   /* terminator */
>> +};
>> +static struct usbmix_name_map uac3_badd_speaker_map[] = {
>> +       { UAC3_BADD_FU_ID2, "Speaker Playback" },
>> +       { 0 }                                   /* terminator */
>> +};
>> +static struct usbmix_name_map uac3_badd_microphone_map[] = {
>> +       { UAC3_BADD_FU_ID5, "Mic Capture" },
>> +       { 0 }                                   /* terminator */
>> +};
>> +/* Covers also 'headset adapter' profile */
>> +static struct usbmix_name_map uac3_badd_headset_map[] = {
>> +       { UAC3_BADD_FU_ID2, "Headset Playback" },
>> +       { UAC3_BADD_FU_ID5, "Headset Capture" },
>> +       { UAC3_BADD_FU_ID7, "Side Tone Mixing" },
> Can you please call this "Sidetone"?
> This better matches other Sidetone control names in the sound tree and
> makes it compatible with existing Android userspace usage.

I have no any objections, "Side Tone" was in UAC3 documentation, but
"Sidetone" is OK too, so will change it

Thanks,
Ruslan