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ALSA: usb: add UAC3 BADD profiles support

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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@gmail.com>
Tested-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ruslan Bilovol
2018-05-04 04:24:04 +03:00
committed by Takashi Iwai
parent 10aa7cad37
commit 17156f23e9
6 changed files with 459 additions and 41 deletions
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9
sound/usb/clock.c
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@ -587,8 +587,15 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
default:
return set_sample_rate_v1(chip, iface, alts, fmt, rate);
case UAC_VERSION_2:
case UAC_VERSION_3:
if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
if (rate != UAC3_BADD_SAMPLING_RATE)
return -ENXIO;
else
return 0;
}
/* fall through */
case UAC_VERSION_2:
return set_sample_rate_v2v3(chip, iface, alts, fmt, rate);
}
}