ASoC: soc-component: add snd_soc_pcm_component_pcm_free()

Current ALSA SoC is directly using component->driver->xxx,
thus, the code nested deeply, and it makes code difficult to read,
and is not good for encapsulation.

We want to implement component related function at soc-component.c,
but, some of them need to care whole snd_soc_pcm_runtime (= rtd)
connected component.

Let's call component related function which need to care with
for_each_rtdcom() loop as snd_soc_pcm_component_xxx().
This patch adds new snd_soc_pcm_component_pcm_free() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k1c54czu.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-component.h

@@ -382,5 +382,6 @@ struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
 int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,
 			       struct vm_area_struct *vma);
 int snd_soc_pcm_component_new(struct snd_pcm *pcm);
+void snd_soc_pcm_component_free(struct snd_pcm *pcm);
 
 #endif /* __SOC_COMPONENT_H */

sound/soc/soc-component.c

@@ -545,3 +545,17 @@ int snd_soc_pcm_component_new(struct snd_pcm *pcm)
 
 	return 0;
 }
+
+void snd_soc_pcm_component_free(struct snd_pcm *pcm)
+{
+	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
+	struct snd_soc_rtdcom_list *rtdcom;
+	struct snd_soc_component *component;
+
+	for_each_rtdcom(rtd, rtdcom) {
+		component = rtdcom->component;
+
+		if (component->driver->pcm_free)
+			component->driver->pcm_free(pcm);
+	}
+}

sound/soc/soc-pcm.c

@@ -2805,17 +2805,10 @@ static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
 static void soc_pcm_private_free(struct snd_pcm *pcm)
 {
 	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
-	struct snd_soc_rtdcom_list *rtdcom;
-	struct snd_soc_component *component;
 
 	/* need to sync the delayed work before releasing resources */
 	flush_delayed_work(&rtd->delayed_work);
-	for_each_rtdcom(rtd, rtdcom) {
-		component = rtdcom->component;
-
-		if (component->driver->pcm_free)
-			component->driver->pcm_free(pcm);
-	}
+	snd_soc_pcm_component_free(pcm);
 }
 
 /* create a new pcm */