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.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c
index 20897dce1bec..d503bc9b0850 100644
--- a/sound/soc/soc-component.c
+++ b/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;
+}