[alsa-devel] How to trigger a widget?
peter.ujfalusi at ti.com
Wed Feb 22 08:28:01 CET 2012
On 02/21/2012 07:09 AM, Wang, Kuirong wrote:
> I have kcontrol to enable a function of codec on fly. With or
> without the function, it cannot impact the established audio routing.
> So I created widget as a supply, as long as the audio path is
> established, this supply widget is triggered. The supply widget has a
> callback event function. The kcontrol control has an event callback
> function as well which calls the enable/disable pin to trigger the
> widget callback event, so this particular function can be enabled or
Would not it be simpler if you just enable/disable the feature in the
kcontrol's set callback?
Another way I would go is this:
|-> (off) ---------|
[Feature switch] -| |-> [next widget]
|-> (on) -> [PGA] -|
In the PGA you turn on/off the feature. If the switch changes it will
not affect other items in the path, it will only make the PGA to turn
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