[alsa-devel] [PATCH 1/7] ALSA: hda: Allow for compress stream to hdac_ext_stream assignment

[Cezary Rojewski]

Currently only PCM streams can enlist hdac_stream for their data
transfer. Add cstream field to hdac_ext_stream to expose possibility of
compress stream assignment in place of PCM one.
Limited to HOST-type only.

Rather than copying entire hdac_ext_host_stream_assign, declare separate
PCM and compress wrappers and reuse it for both cases.

Signed-off-by: Cezary Rojewski <cezary.rojewski at intel.com>
---
 include/sound/hdaudio.h         |  1 +
 include/sound/hdaudio_ext.h     |  2 ++
 sound/hda/ext/hdac_ext_stream.c | 46 +++++++++++++++++++++++++++++----
 3 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index e05b95e83d5a..9a8bf1eb7d69 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -481,6 +481,7 @@ struct hdac_stream {
 	struct snd_pcm_substream *substream;	/* assigned substream,
 						 * set in PCM open
 						 */
+	struct snd_compr_stream *cstream;
 	unsigned int format_val;	/* format value to be set in the
 					 * controller and the codec
 					 */
diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index ef88b20c7b0a..ec01f2024f0b 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -84,6 +84,8 @@ int snd_hdac_ext_stream_init_all(struct hdac_bus *bus, int start_idx,
 		int num_stream, int dir);
 void snd_hdac_stream_free_all(struct hdac_bus *bus);
 void snd_hdac_link_free_all(struct hdac_bus *bus);
+struct hdac_ext_stream *snd_hdac_ext_cstream_assign(struct hdac_bus *bus,
+					   struct snd_compr_stream *cstream);
 struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_bus *bus,
 					   struct snd_pcm_substream *substream,
 					   int type);
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
index 6b1b4b834bae..b898b6c0b55d 100644
--- a/sound/hda/ext/hdac_ext_stream.c
+++ b/sound/hda/ext/hdac_ext_stream.c
@@ -14,6 +14,7 @@
 #include <sound/pcm.h>
 #include <sound/hda_register.h>
 #include <sound/hdaudio_ext.h>
+#include <sound/compress_driver.h>
 
 /**
  * snd_hdac_ext_stream_init - initialize each stream (aka device)
@@ -281,8 +282,7 @@ hdac_ext_link_stream_assign(struct hdac_bus *bus,
 }
 
 static struct hdac_ext_stream *
-hdac_ext_host_stream_assign(struct hdac_bus *bus,
-				struct snd_pcm_substream *substream)
+hdac_ext_host_stream_assign(struct hdac_bus *bus, int direction)
 {
 	struct hdac_ext_stream *res = NULL;
 	struct hdac_stream *stream = NULL;
@@ -296,7 +296,7 @@ hdac_ext_host_stream_assign(struct hdac_bus *bus,
 		struct hdac_ext_stream *hstream = container_of(stream,
 						struct hdac_ext_stream,
 						hstream);
-		if (stream->direction != substream->stream)
+		if (stream->direction != direction)
 			continue;
 
 		if (!stream->opened) {
@@ -310,13 +310,49 @@ hdac_ext_host_stream_assign(struct hdac_bus *bus,
 		spin_lock_irq(&bus->reg_lock);
 		res->hstream.opened = 1;
 		res->hstream.running = 0;
-		res->hstream.substream = substream;
+		res->hstream.substream = NULL;
+		res->hstream.cstream = NULL;
 		spin_unlock_irq(&bus->reg_lock);
 	}
 
 	return res;
 }
 
+static struct hdac_ext_stream *
+hdac_ext_host_stream_pcm_assign(struct hdac_bus *bus,
+				struct snd_pcm_substream *substream)
+{
+	struct hdac_ext_stream *res;
+
+	res = hdac_ext_host_stream_assign(bus, substream->stream);
+	if (res)
+		res->hstream.substream = substream;
+
+	return res;
+}
+
+/**
+ * snd_hdac_ext_cstream_assign - assign a host stream for compress
+ * @bus: HD-audio core bus
+ * @cstream: Compress stream to assign
+ *
+ * Assign an unused host stream for the given compress stream.
+ * If no stream is free, NULL is returned. Stream is decoupled
+ * before assignment.
+ */
+struct hdac_ext_stream *snd_hdac_ext_cstream_assign(struct hdac_bus *bus,
+					   struct snd_compr_stream *cstream)
+{
+	struct hdac_ext_stream *res;
+
+	res = hdac_ext_host_stream_assign(bus, cstream->direction);
+	if (res)
+		res->hstream.cstream = cstream;
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_cstream_assign);
+
 /**
  * snd_hdac_ext_stream_assign - assign a stream for the PCM
  * @bus: HD-audio core bus
@@ -350,7 +386,7 @@ struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_bus *bus,
 		return hstream;
 
 	case HDAC_EXT_STREAM_TYPE_HOST:
-		return hdac_ext_host_stream_assign(bus, substream);
+		return hdac_ext_host_stream_pcm_assign(bus, substream);
 
 	case HDAC_EXT_STREAM_TYPE_LINK:
 		return hdac_ext_link_stream_assign(bus, substream);
-- 
2.17.1