[alsa-devel] [PATCHv2 2/3] ASoC: Move widgets from DAPM context to snd_soc_card

Mark Brown broonie at opensource.wolfsonmicro.com
Fri Nov 12 14:18:41 CET 2010

On Fri, Nov 12, 2010 at 11:23:25AM +0200, Jarkko Nikula wrote:

> Cross-device paths are registered by listing the widgets from device A in
> a map for device B. An example below shows a path that connects MONO out of
> A into Line In of B:

> static const struct snd_soc_dapm_route mapA[] = {
> 	{"MONO", NULL, "DAC"},
> };

> static const struct snd_soc_dapm_route mapB[] = {
> 	{"Line In", NULL, "MONO"},
> };

This is going to fall over if we have widgets in two devices with the
same name (and especially if we have two devices of the same kind in the
system).  Adding source device names to the paths would probably cover
it with the same format but it should be considered and noted here.

>  struct snd_soc_dapm_context {
> -	struct list_head widgets;
> +	int n_widgets; /* number of widgets in this context */

I'm not sure why we need to count the number of widgets here; 

> index 835087d..77be6b3 100644
> --- a/include/sound/soc.h
> +++ b/include/sound/soc.h
> @@ -618,6 +618,7 @@ struct snd_soc_card {
>  	struct list_head platform_dev_list;
>  	struct list_head dai_dev_list;
> +	struct list_head widgets;
>  	struct list_head paths;

If we keep moving stuff into the card it's questionable what the context
is buying us...

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