soc_get_playback_capture() (A) returns number of substreams for playback/capture (B). ASoC will probe the Sound Card and mapps CPU<->Codec pair.
(A) static int soc_get_playback_capture(..., (B) int *playback, int *capture) { ... if (rtd->dai_link->playback_only) { *playback = 1; *capture = 0; }
if (rtd->dai_link->capture_only) { *playback = 0; *capture = 1; } (C) return 0; }
But it might be no playback no capture if it returns playback=0, capture=0. It is very difficult to notice about it. This patch indicates error at (C) then.
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- sound/soc/soc-pcm.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 7247f44faa1c..fe65994485f8 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -2815,6 +2815,13 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd, *capture = 1; }
+ if (!*playback && !*capture) { + dev_err(rtd->dev, "substream %s has no playback, no capture\n", + rtd->dai_link->stream_name); + + return -EINVAL; + } + return 0; }