How to trigger a widget?

How to trigger a widget?

[Wang, Kuirong]

As I saw many examples to use the snd_soc_dapm_enable_pin() to trigger a particular widget. But I saw the widget has to be like a speaker, mic, lineout, etc. Could I use the snd_soc_dapm_enable_pin() to trigger any type of widget I want?  I tried to use it to trigger a supply widget, but I never see it works even I did snd_soc_dapm_sync() after the enable_pin.  Could someone provide some inputs?

Appreciated your time.

Thanks,

Kuirong Wang

Re: How to trigger a widget?

[Lars-Peter Clausen]

On 02/20/2012 08:13 AM, Wang, Kuirong wrote:
> As I saw many examples to use the snd_soc_dapm_enable_pin() to trigger a particular widget. But I saw the widget has to be like a speaker, mic, lineout, etc. Could I use the snd_soc_dapm_enable_pin() to trigger any type of widget I want?  I tried to use it to trigger a supply widget, but I never see it works even I did snd_soc_dapm_sync() after the enable_pin.  Could someone provide some inputs?
> 
> Appreciated your time.
> 
> Thanks,
> 
> Kuirong Wang

Hi,

snd_soc_dapm_force_enable_pin is probably what you are looking for.

- Lars

Re: How to trigger a widget?

[Wang, Kuirong]

On 02/20/2012 1:08 AM, Lars-Peter Clausen wrote:
>
>Hi,
>
>snd_soc_dapm_force_enable_pin is probably what you are looking for.
>
>- Lars

Thanks Lars. I tried the snd_soc_dapm_force_enable_pin, it didn't make different.

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 disabled.

Thanks,
- Kuirong



 

Re: How to trigger a widget?

[Lars-Peter Clausen]

On 02/21/2012 06:09 AM, Wang, Kuirong wrote:
> On 02/20/2012 1:08 AM, Lars-Peter Clausen wrote:
>>
>> Hi,
>>
>> snd_soc_dapm_force_enable_pin is probably what you are looking for.
>>
>> - Lars
> 
> Thanks Lars. I tried the snd_soc_dapm_force_enable_pin, it didn't make different.
> 
> 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 disabled.
> 

I'm not quite sure if I understand what you want to do, but a
snd_soc_dapm_force_enable_pin followed by a snd_soc_dapm_sync should enable a
widget regardless of whether it is currently in use or not.

Re: How to trigger a widget?

[Peter Ujfalusi]

Hi,

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
> disabled.

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
on/off.

-- 
Péter

Re: How to trigger a widget?

[Wang, Kuirong]

On 02/21/2012 11:28 PM, Peter Ujfalusi  wrote:
>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 on/off.
>
>--
>Péter

Peter,

I don't want to power on this circuit related to the feature if the audio stream is not playing so if I use the kcontrol callback function to do so, it could power up even the audio stream is not playing. 

I will try the way you suggested by using a switch. In the meanwhile, I will check why the enable_pin doesn't work as expected in my system.

Thanks!

Kuirong