Re: [alsa-devel] [PATCH v2 3/5] ASoC: core: add support to snd_soc_dai_get_sdw_stream()

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

On 8/13/19 3:35 AM, Srinivas Kandagatla wrote:
> On platforms which have smart speaker amplifiers connected via
> soundwire and modeled as aux devices in ASoC, in such usecases machine
> driver should be able to get sdw master stream from dai so that it can
> use the runtime stream to setup slave streams.

using the _set_sdw_stream? I don't fully get the sequence with the 
wording above.

> 
> soundwire already as a set function, get function would provide more
> flexibility to above configurations.

I am not clear if you are asking for both to be used, or get only or set 
only?

> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
>   include/sound/soc-dai.h | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
> index dc48fe081a20..1e01f4a302e0 100644
> --- a/include/sound/soc-dai.h
> +++ b/include/sound/soc-dai.h
> @@ -202,6 +202,7 @@ struct snd_soc_dai_ops {
>   
>   	int (*set_sdw_stream)(struct snd_soc_dai *dai,
>   			void *stream, int direction);
> +	void *(*get_sdw_stream)(struct snd_soc_dai *dai, int direction);
>   	/*
>   	 * DAI digital mute - optional.
>   	 * Called by soc-core to minimise any pops.
> @@ -410,4 +411,13 @@ static inline int snd_soc_dai_set_sdw_stream(struct snd_soc_dai *dai,
>   		return -ENOTSUPP;
>   }
>   
> +static inline void *snd_soc_dai_get_sdw_stream(struct snd_soc_dai *dai,
> +					       int direction)
> +{
> +	if (dai->driver->ops->get_sdw_stream)
> +		return dai->driver->ops->get_sdw_stream(dai, direction);
> +	else
> +		return ERR_PTR(-ENOTSUPP);
> +}
> +
>   #endif
>