[PATCH 1/1] ASoC: soc-component: add snd_soc_component_ack()

["Gyeongtaek Lee" <gt82.lee@samsung.com>]

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_ack() and use it.
Ack callback is revived because some ASoC driver is using it.

Signed-off-by: Gyeongtaek Lee <gt82.lee@samsung.com>
---
 include/sound/soc-component.h |  3 +++
 sound/soc/soc-component.c     | 14 ++++++++++++++
 sound/soc/soc-pcm.c           |  2 ++
 3 files changed, 19 insertions(+)

diff --git a/include/sound/soc-component.h b/include/sound/soc-component.h
index 154d02fbbfed..a8c60efac8f7 100644
--- a/include/sound/soc-component.h
+++ b/include/sound/soc-component.h
@@ -104,6 +104,8 @@ struct snd_soc_component_driver {
 	struct page *(*page)(struct snd_soc_component *component,
 			     struct snd_pcm_substream *substream,
 			     unsigned long offset);
+	int (*ack) (struct snd_soc_component *component,
+		    struct snd_pcm_substream *substream);
 	int (*mmap)(struct snd_soc_component *component,
 		    struct snd_pcm_substream *substream,
 		    struct vm_area_struct *vma);
@@ -415,6 +417,7 @@ struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
 					unsigned long offset);
 int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,
 			       struct vm_area_struct *vma);
+int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream);
 int snd_soc_pcm_component_new(struct snd_soc_pcm_runtime *rtd);
 void snd_soc_pcm_component_free(struct snd_soc_pcm_runtime *rtd);
 
diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c
index 785a0385cc7f..b4b3245ef016 100644
--- a/sound/soc/soc-component.c
+++ b/sound/soc/soc-component.c
@@ -516,6 +516,20 @@ int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,
 	return -EINVAL;
 }
 
+int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component;
+	int i;
+
+	/* FIXME. it returns 1st ack now */
+	for_each_rtd_components(rtd, i, component)
+		if (component->driver->ack)
+			return component->driver->ack(component, substream);
+
+	return -EINVAL;
+}
+
 int snd_soc_pcm_component_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_component *component;
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 289aebc15529..c6fddd1cb5aa 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -3027,6 +3027,8 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 			rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
 		if (drv->sync_stop)
 			rtd->ops.sync_stop	= snd_soc_pcm_component_sync_stop;
+		if (drv->ack)
+			rtd->ops.ack		= snd_soc_pcm_component_ack;
 		if (drv->copy_user)
 			rtd->ops.copy_user	= snd_soc_pcm_component_copy_user;
 		if (drv->page)
-- 
2.21.0