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ALSA: usb-audio: UAC3: Parse Input Terminal number of channels.

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Obtain the number of channels for the Input Terminal from the
Logical Cluster Descriptor. This achieves a useful minimal parsing
of this unit so it can be used in other units in the topology.

Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Tested-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jorge Sanjuan 2018-05-14 12:03:42 +01:00 committed by Takashi Iwai
parent 1d38f5d828
commit 710669455d
1 changed files with 6 additions and 2 deletions
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8
sound/usb/mixer.c
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@ -902,8 +902,12 @@ static int check_input_term(struct mixer_build *state, int id,
term->id = id;
term->type = le16_to_cpu(d->wTerminalType);
/* REVISIT: UAC3 IT doesn't have channels/cfg */
term->channels = 0;
err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
if (err < 0)
return err;
term->channels = err;
/* REVISIT: UAC3 IT doesn't have channels cfg */
term->chconfig = 0;
term->name = le16_to_cpu(d->wTerminalDescrStr);