[alsa-devel] [PATCH 3/5] ALSA: hdac: Add snd_hdac_get_hdac_stream()

[Takashi Iwai]

On Fri, 21 Aug 2015 18:06:19 +0200,
Vinod Koul wrote:
> 
> From: Jeeja KP <jeeja.kp at intel.com>
> 
> Add a helper to find the stream using stream tag and direction.
> This is useful for drivers to query stream based on stream tag and
> direction, fox example while downloading FW thru DSP loader code
> 
> Signed-off-by: Jeeja KP <jeeja.kp at intel.com>
> Signed-off-by: Vinod Koul <vinod.koul at intel.com>
> ---
>  include/sound/hdaudio.h |  2 ++
>  sound/hda/hdac_stream.c | 19 +++++++++++++++++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
> index e37c3355ae8a..67f7068696b9 100644
> --- a/include/sound/hdaudio.h
> +++ b/include/sound/hdaudio.h
> @@ -438,6 +438,8 @@ void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
>  struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
>  					   struct snd_pcm_substream *substream);
>  void snd_hdac_stream_release(struct hdac_stream *azx_dev);
> +struct hdac_stream *snd_hdac_get_hdac_stream(struct hdac_bus *bus,
> +						int dir, int stream_tag);
>  
>  int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
>  void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
> diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
> index 4c15d0accc9e..02aed2e85504 100644
> --- a/sound/hda/hdac_stream.c
> +++ b/sound/hda/hdac_stream.c
> @@ -286,6 +286,25 @@ void snd_hdac_stream_release(struct hdac_stream *azx_dev)
>  }
>  EXPORT_SYMBOL_GPL(snd_hdac_stream_release);
>  
> +/**
> + * snd_hdac_get_hdac_stream - return hdac_stream based on stream_tag and
> + * direction
> + *
> + * @bus: HD-audio core bus
> + */

Please complete the description.

> +struct hdac_stream *snd_hdac_get_hdac_stream(struct hdac_bus *bus,
> +						int dir, int stream_tag)
> +{
> +	struct hdac_stream *s;
> +
> +	list_for_each_entry(s, &bus->stream_list, list) {
> +		if (s->direction == dir && s->stream_tag == stream_tag)
> +			return s;
> +	}
> +
> +	return NULL;
> +}
> +EXPORT_SYMBOL_GPL(snd_hdac_get_hdac_stream);
>  /*

Put the empty line after EXPORT_SYMBOL_GPL().


thanks,

Takashi