ASoC: soc-pcm: Allow to specify unidirectional dai_link

Add 'playback_only' and 'capture_only' fields that can be used for specifying
that a dai_link has a unidirectional capability.

The motivation for this is for the cases of systems, such as Freescale MX28,
that has two unidirectional DAIs.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index c0ac3bc..65414e8 100644 (file)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -936,6 +936,10 @@ struct snd_soc_dai_link {
        /* machine stream operations */
        const struct snd_soc_ops *ops;
        const struct snd_soc_compr_ops *compr_ops;
+
+       /* For unidirectional dai links */
+       bool playback_only;
+       bool capture_only;
 };
 
 struct snd_soc_codec_conf {

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index b6c6403..9abaa52 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2027,6 +2027,16 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
                        capture = 1;
        }
 
+       if (rtd->dai_link->playback_only) {
+               playback = 1;
+               capture = 0;
+       }
+
+       if (rtd->dai_link->capture_only) {
+               playback = 0;
+               capture = 1;
+       }
+
        /* create the PCM */
        if (rtd->dai_link->no_pcm) {
                snprintf(new_name, sizeof(new_name), "(%s)",