ASoC: soc-component: add snd_soc_pcm_component_page()

Current ALSA SoC is directly using component->driver->ops->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_page() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87o91h4d06.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-component.h

@@ -377,5 +377,7 @@ int snd_soc_pcm_component_ioctl(struct snd_pcm_substream *substream,
 int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
 				    int channel, unsigned long pos,
 				    void __user *buf, unsigned long bytes);
+struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
+					unsigned long offset);
 
 #endif /* __SOC_COMPONENT_H */

sound/soc/soc-component.c

@@ -483,3 +483,26 @@ int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
 
 	return -EINVAL;
 }
+
+struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
+					unsigned long offset)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_rtdcom_list *rtdcom;
+	struct snd_soc_component *component;
+	struct page *page;
+
+	for_each_rtdcom(rtd, rtdcom) {
+		component = rtdcom->component;
+
+		/* FIXME. it returns 1st page now */
+		if (component->driver->ops &&
+		    component->driver->ops->page) {
+			page = component->driver->ops->page(substream, offset);
+			if (page)
+				return page;
+		}
+	}
+
+	return NULL;
+}

sound/soc/soc-pcm.c

@@ -2818,30 +2818,6 @@ static void soc_pcm_private_free(struct snd_pcm *pcm)
 	}
 }
 
-static struct page *soc_rtdcom_page(struct snd_pcm_substream *substream,
-				    unsigned long offset)
-{
-	struct snd_soc_pcm_runtime *rtd = substream->private_data;
-	struct snd_soc_rtdcom_list *rtdcom;
-	struct snd_soc_component *component;
-	struct page *page;
-
-	for_each_rtdcom(rtd, rtdcom) {
-		component = rtdcom->component;
-
-		if (!component->driver->ops ||
-		    !component->driver->ops->page)
-			continue;
-
-		/* FIXME. it returns 1st page now */
-		page = component->driver->ops->page(substream, offset);
-		if (page)
-			return page;
-	}
-
-	return NULL;
-}
-
 static int soc_rtdcom_mmap(struct snd_pcm_substream *substream,
 			   struct vm_area_struct *vma)
 {
@@ -2990,7 +2966,7 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 		if (ops->copy_user)
 			rtd->ops.copy_user	= snd_soc_pcm_component_copy_user;
 		if (ops->page)
-			rtd->ops.page		= soc_rtdcom_page;
+			rtd->ops.page		= snd_soc_pcm_component_page;
 		if (ops->mmap)
 			rtd->ops.mmap		= soc_rtdcom_mmap;
 	}