ASoC: soc-pcm: add soc_create_pcm() and simplify soc_new_pcm()

soc_new_pcm() implementation is very long / verbose / complex,
thus, it is very difficult to read.
If we read it carefully, we can notice that it is consisted by

	int soc_new_pcm(...)
	{
		(1) judging playback/caputre part
		(2) creating the PCM part
		(3) setup pcm/rtd part
	}

This patch adds new soc_create_pcm() for (2) part
and offload it from snd_pcm_new().
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/875z3paigi.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-pcm.c

@@ -2719,18 +2719,12 @@ static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
 	return 0;
 }
 
-/* create a new pcm */
-int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
+static int soc_create_pcm(struct snd_pcm **pcm,
+			  struct snd_soc_pcm_runtime *rtd,
+			  int playback, int capture, int num)
 {
-	struct snd_soc_component *component;
-	struct snd_pcm *pcm;
 	char new_name[64];
-	int ret = 0, playback = 0, capture = 0;
-	int i;
-
-	ret = soc_get_playback_capture(rtd, &playback, &capture);
-	if (ret < 0)
-		return ret;
+	int ret;
 
 	/* create the PCM */
 	if (rtd->dai_link->params) {
@@ -2738,13 +2732,13 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 			 rtd->dai_link->stream_name);
 
 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
-					   playback, capture, &pcm);
+					   playback, capture, pcm);
 	} else if (rtd->dai_link->no_pcm) {
 		snprintf(new_name, sizeof(new_name), "(%s)",
 			rtd->dai_link->stream_name);
 
 		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
-				playback, capture, &pcm);
+				playback, capture, pcm);
 	} else {
 		if (rtd->dai_link->dynamic)
 			snprintf(new_name, sizeof(new_name), "%s (*)",
@@ -2756,7 +2750,7 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 				"multicodec" : asoc_rtd_to_codec(rtd, 0)->name, num);
 
 		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
-			capture, &pcm);
+			capture, pcm);
 	}
 	if (ret < 0) {
 		dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
@@ -2765,6 +2759,25 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 	}
 	dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
 
+	return 0;
+}
+
+/* create a new pcm */
+int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
+{
+	struct snd_soc_component *component;
+	struct snd_pcm *pcm;
+	int ret = 0, playback = 0, capture = 0;
+	int i;
+
+	ret = soc_get_playback_capture(rtd, &playback, &capture);
+	if (ret < 0)
+		return ret;
+
+	ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
+	if (ret < 0)
+		return ret;
+
 	/* DAPM dai link stream work */
 	if (rtd->dai_link->params)
 		rtd->close_delayed_work_func = codec2codec_close_delayed_work;
@@ -2825,8 +2838,8 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 
 	ret = snd_soc_pcm_component_new(rtd);
 	if (ret < 0) {
-		dev_err(rtd->dev, "ASoC: pcm %s constructor failed for dailink %s: %d\n",
-			new_name, rtd->dai_link->name, ret);
+		dev_err(rtd->dev, "ASoC: pcm constructor failed for dailink %s: %d\n",
+			rtd->dai_link->name, ret);
 		return ret;
 	}