ASoC: soc-component: add snd_soc_component_hw_free()

Current ALSA SoC is directly using component->driver->ops->xxx,
thus, it is deep nested, and makes code difficult to read,
and is not good for encapsulation.
This patch adds new snd_soc_component_hw_free() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87a7d15rna.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-component.h

@@ -348,5 +348,7 @@ int snd_soc_component_prepare(struct snd_soc_component *component,
 int snd_soc_component_hw_params(struct snd_soc_component *component,
 				struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params);
+int snd_soc_component_hw_free(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream);
 
 #endif /* __SOC_COMPONENT_H */

sound/soc/soc-component.c

@@ -326,3 +326,13 @@ int snd_soc_component_hw_params(struct snd_soc_component *component,
 
 	return 0;
 }
+
+int snd_soc_component_hw_free(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream)
+{
+	if (component->driver->ops &&
+	    component->driver->ops->hw_free)
+		return component->driver->ops->hw_free(substream);
+
+	return 0;
+}

sound/soc/soc-pcm.c

@@ -847,6 +847,7 @@ static int soc_pcm_components_hw_free(struct snd_pcm_substream *substream,
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_rtdcom_list *rtdcom;
 	struct snd_soc_component *component;
+	int ret = 0;
 
 	for_each_rtdcom(rtd, rtdcom) {
 		component = rtdcom->component;
@@ -854,14 +855,10 @@ static int soc_pcm_components_hw_free(struct snd_pcm_substream *substream,
 		if (component == last)
 			break;
 
-		if (!component->driver->ops ||
-		    !component->driver->ops->hw_free)
-			continue;
-
-		component->driver->ops->hw_free(substream);
+		ret |= snd_soc_component_hw_free(component, substream);
 	}
 
-	return 0;
+	return ret;
 }
 
 /*