ASoC: soc-dai: add snd_soc_dai_trigger()

Current ALSA SoC is directly using dai->driver->ops->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_trigger() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87sgqyhn40.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -156,6 +156,8 @@ void snd_soc_dai_shutdown(struct snd_soc_dai *dai,
 			  struct snd_pcm_substream *substream);
 int snd_soc_dai_prepare(struct snd_soc_dai *dai,
 			struct snd_pcm_substream *substream);
+int snd_soc_dai_trigger(struct snd_soc_dai *dai,
+			struct snd_pcm_substream *substream, int cmd);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-dai.c

@@ -318,3 +318,15 @@ int snd_soc_dai_prepare(struct snd_soc_dai *dai,
 
 	return ret;
 }
+
+int snd_soc_dai_trigger(struct snd_soc_dai *dai,
+			struct snd_pcm_substream *substream,
+			int cmd)
+{
+	int ret = 0;
+
+	if (dai->driver->ops->trigger)
+		ret = dai->driver->ops->trigger(substream, cmd, dai);
+
+	return ret;
+}

sound/soc/soc-pcm.c

@@ -1084,13 +1084,10 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 	int i, ret;
 
 	for_each_rtd_codec_dai(rtd, i, codec_dai) {
-		if (codec_dai->driver->ops->trigger) {
-			ret = codec_dai->driver->ops->trigger(substream,
-							      cmd, codec_dai);
+		ret = snd_soc_dai_trigger(codec_dai, substream, cmd);
 		if (ret < 0)
 			return ret;
 	}
-	}
 
 	for_each_rtdcom(rtd, rtdcom) {
 		component = rtdcom->component;
@@ -1104,11 +1101,9 @@ static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 			return ret;
 	}
 
-	if (cpu_dai->driver->ops->trigger) {
-		ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
+	snd_soc_dai_trigger(cpu_dai, substream, cmd);
 	if (ret < 0)
 		return ret;
-	}
 
 	if (rtd->dai_link->ops->trigger) {
 		ret = rtd->dai_link->ops->trigger(substream, cmd);