1 files changed, 122 insertions, 0 deletions
diff --git a/sound/avirt.h b/sound/avirt.h
new file mode 100644
index 0000000..5df84fe
--- /dev/null
+++ b/sound/avirt.h
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AVIRT - ALSA Virtual Soundcard
+ *
+ * Copyright (c) 2010-2018 Fiberdyne Systems Pty Ltd
+ * 
+ * avirt.h - AVIRT system-level header
+ */
+
+#ifndef __SOUND_AVIRT_H
+#define __SOUND_AVIRT_H
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <linux/configfs.h>
+
+#define MAX_STREAMS 16
+#define MAX_NAME_LEN 80
+
+#define DINFO(logname, fmt, args...)                                           \
+	snd_printk(KERN_INFO "AVIRT: %s: " fmt "\n", logname, ##args)
+
+#define DERROR(logname, fmt, args...)                                          \
+	snd_printk(KERN_ERR "AVIRT: %s: " fmt "\n", logname, ##args)
+
+#define DDEBUG(logname, fmt, args...)                                          \
+	snd_printk(KERN_DEBUG "AVIRT: %s: " fmt "\n", logname, ##args)
+
+/**
+ * AVIRT Audio Path configure function type
+ * Each Audio Path registers this at avirt_audiopath_register time.
+ * It is then called by the core once AVIRT has been configured
+ */
+typedef int (*avirt_audiopath_configure)(struct snd_card *card,
+					 struct config_group *stream_group,
+					 unsigned int stream_count);
+
+/**
+ * AVIRT Audio Path info
+ */
+struct avirt_audiopath {
+	const char *uid; /* Unique identifier */
+	const char *name; /* Pretty name */
+	unsigned int version[3]; /* Version - Major.Minor.Ext */
+	const struct snd_pcm_hardware *hw; /* ALSA PCM HW conf */
+	const struct snd_pcm_ops *pcm_ops; /* ALSA PCM op table */
+	avirt_audiopath_configure configure; /* Configure callback function */
+
+	void *context;
+};
+
+/*
+ * Audio stream configuration
+ */
+struct avirt_stream {
+	char name[MAX_NAME_LEN]; /* Stream name */
+	char map[MAX_NAME_LEN]; /* Stream Audio Path mapping */
+	unsigned int channels; /* Stream channel count */
+	unsigned int device; /* Stream PCM device no. */
+	unsigned int direction; /* Stream direction */
+	struct snd_pcm *pcm; /* ALSA PCM  */
+	struct config_item item; /* configfs item reference */
+};
+
+/**
+ * AVIRT core info
+ */
+struct avirt_coreinfo {
+	unsigned int version[3];
+};
+
+/**
+ * avirt_audiopath_register - register Audio Path with ALSA virtual driver
+ * @audiopath: Audio Path to be registered
+ * @core: ALSA virtual driver core info
+ * @return: 0 on success or error code otherwise
+ */
+int avirt_audiopath_register(struct avirt_audiopath *audiopath,
+			     struct avirt_coreinfo **coreinfo);
+
+/**
+ * avirt_audiopath_deregister - deregister Audio Path with ALSA virtual driver
+ * @audiopath: Audio Path to be deregistered
+ * @return: 0 on success or error code otherwise
+ */
+int avirt_audiopath_deregister(struct avirt_audiopath *audiopath);
+
+/**
+ * avirt_audiopath_get - retrieves the Audio Path by it's UID
+ * @uid: Unique ID for the Audio Path
+ * @return: Corresponding Audio Path
+ */
+struct avirt_audiopath *avirt_audiopath_get(const char *uid);
+
+/**
+ * avirt_stream_count - get the stream count for the given direction
+ * @direction: The direction to get the stream count for
+ * @return: The stream count
+ */
+int avirt_stream_count(unsigned int direction);
+
+/**
+ * avirt_stream_from_config_item - Convert a config_item to an avirt_stream
+ * @item: The config_item to convert from
+ * @return: The item's avirt_stream if successful, NULL otherwise
+ */
+static inline struct avirt_stream *
+avirt_stream_from_config_item(struct config_item *item)
+{
+	return item ? container_of(item, struct avirt_stream, item) : NULL;
+}
+
+/**
+ * avirt_pcm_period_elapsed - PCM buffer complete callback
+ * @substream: pointer to ALSA PCM substream
+ *
+ * This should be called from a child Audio Path once it has finished processing
+ * the PCM buffer
+ */
+void avirt_pcm_period_elapsed(struct snd_pcm_substream *substream);
+
+#endif // __SOUND_AVIRT_H