WM8753 Speaker Playback ZC Switch

[Al Johnson]

On Friday 12 November 2010, Ed Kapitein wrote:
> Hi All,
> 
> I am happily hacking on my FR and was toying with the wolfson.
> I happen to notice that in order to get any sound from the earpiece i
> had to switch on the Speaker Playback ZC Switch.
> That switch is mentioned in the statefile, but i can't find it in any of
> the diagrams on [1] [2]

The one in the wiki is just an annotation of the Wolfson diagram, adding alsa 
control numbers to the visible elements where I could identify them. I think 
there were some elements I couldn't identify a control number for, and there 
are a lot of controls that have no representative element in the diagram, 
usually because they involve digital processing rather than an identifiable 
analogue element. If you find a mistake or something to add then please make 
the correction.

> Is there someone with an updated version of the diagrams, that includes
> the two switches below?
> 
>         control.9 {
>                 comment.access 'read write'
>                 comment.type BOOLEAN
>                 comment.count 2
>                 iface MIXER
>                 name 'Headphone Playback ZC Switch'
>                 value.0 false
>                 value.1 false
>         }
>         control.10 {
>                 comment.access 'read write'
>                 comment.type BOOLEAN
>                 comment.count 2
>                 iface MIXER
>                 name 'Speaker Playback ZC Switch'
>                 value.0 true
>                 value.1 true
>         }
> 
> Kind regards,
> Ed
> 
> [1] http://wiki.openmoko.org/wiki/Neo1973_Audio_Subsystem
> 
> [2] http://www.wolfsonmicro.com/products/audio_hubs/WM8753/