From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Harvey <tim_harvey@yahoo.com>
Subject: driver mixer control questions
Date: Tue, 1 May 2007 21:40:25 -0700 (PDT)
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I'm troubleshooting an issue with an ALSA driver I wrote for a very unique
hardware platform.  In this case I have an audio codec which only has a usable
'line-in' capture source.  Currently the only mixer control I've created is a
'Master Playback Volume'.  Do I need to create some kind of control for
'line-in'?  

I'm unclear how to 'register' capture inputs so that they will be returned by
the OSS mixer emulation's ioctl SOUND_MIXER_READ_RECMASK.  Currently that ioctl
returns 0 for my mixer device.

Also, is a control 'switch' such as 'Master Playback Switch' simply a mute
control or is it intended to be any type of control which could have enumerated
values?

Thanks,

Tim