Add ability to route audio between audio paths

Configfs interface for adding 'routes' is added, and allows two audio paths to chain together particular inputs/outputs, allowing for multistage audio driver handling.

A particular use-case is that of an ADSP driver. We can feed in audio to it, and capture the processed, and/or mixed, audio at it's output, and direct to another audio path driver, such as the UNICENS audio driver.

Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

1 files changed, 27 insertions, 0 deletions

diff --git a/sysfs.c b/sysfs.c
index b7d28f5..29f9b5d 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -115,15 +115,42 @@ static ssize_t version_show(struct snd_avirt_audiopath_obj *audiopath_obj,
 		       audiopath->version[1], audiopath->version[2]);
 }
 
+static ssize_t route_from_ap_show(struct snd_avirt_audiopath_obj *audiopath_obj,
+				  struct snd_avirt_audiopath_attribute *attr,
+				  char *buf)
+{
+	struct snd_avirt_audiopath *audiopath = audiopath_obj->path;
+
+	if (audiopath->route_from_ap)
+		return sprintf(buf, "%s\n", audiopath->route_from_ap->uid);
+
+	return 0;
+}
+
+static ssize_t route_to_ap_show(struct snd_avirt_audiopath_obj *audiopath_obj,
+				struct snd_avirt_audiopath_attribute *attr,
+				char *buf)
+{
+	struct snd_avirt_audiopath *audiopath = audiopath_obj->path;
+
+	if (audiopath->route_to_ap)
+		return sprintf(buf, "%s\n", audiopath->route_to_ap->uid);
+
+	return 0;
+}
 
 static struct snd_avirt_audiopath_attribute snd_avirt_audiopath_attrs[] = {
 	__ATTR_RO(name),
 	__ATTR_RO(version),
+	__ATTR_RO(route_from_ap),
+	__ATTR_RO(route_to_ap),
 };
 
 static struct attribute *snd_avirt_audiopath_def_attrs[] = {
 	&snd_avirt_audiopath_attrs[0].attr,
 	&snd_avirt_audiopath_attrs[1].attr,
+	&snd_avirt_audiopath_attrs[2].attr,
+	&snd_avirt_audiopath_attrs[3].attr,
 	NULL,
 };