[PATCH v4 1/6] ASoC: soc-component: Add snd_soc_pcm_component_ack

[Shengjiu Wang <shengjiu.wang@xxxxxxx>]

Add snd_soc_pcm_component_ack back, which can be used to get an
updated buffer pointer in the platform driver.
On Asymmetric multiprocessor, this pointer can be sent to Cortex-M
core for audio processing.

Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
---
 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 7dc75b39287f..722cfab28d29 100644
--- a/include/sound/soc-component.h
+++ b/include/sound/soc-component.h
@@ -146,6 +146,8 @@ struct snd_soc_component_driver {
 	int (*mmap)(struct snd_soc_component *component,
 		    struct snd_pcm_substream *substream,
 		    struct vm_area_struct *vma);
+	int (*ack)(struct snd_soc_component *component,
+		   struct snd_pcm_substream *substream);
 
 	const struct snd_compress_ops *compress_ops;
 
@@ -498,5 +500,6 @@ int snd_soc_pcm_component_pm_runtime_get(struct snd_soc_pcm_runtime *rtd,
 					 void *stream);
 void snd_soc_pcm_component_pm_runtime_put(struct snd_soc_pcm_runtime *rtd,
 					  void *stream, int rollback);
+int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream);
 
 #endif /* __SOC_COMPONENT_H */
diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c
index 8415e9bd2932..3a5e84e16a87 100644
--- a/sound/soc/soc-component.c
+++ b/sound/soc/soc-component.c
@@ -1212,3 +1212,17 @@ void snd_soc_pcm_component_pm_runtime_put(struct snd_soc_pcm_runtime *rtd,
 		soc_component_mark_pop(component, stream, pm);
 	}
 }
+
+int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_component *component;
+	int i;
+
+	/* FIXME: use 1st pointer */
+	for_each_rtd_components(rtd, i, component)
+		if (component->driver->ack)
+			return component->driver->ack(component, substream);
+
+	return 0;
+}
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index ba8ffbf8a5d3..e75b404a9f36 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2826,6 +2826,8 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 			rtd->ops.page		= snd_soc_pcm_component_page;
 		if (drv->mmap)
 			rtd->ops.mmap		= snd_soc_pcm_component_mmap;
+		if (drv->ack)
+			rtd->ops.ack            = snd_soc_pcm_component_ack;
 	}
 
 	if (playback)
-- 
2.27.0