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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* virtio-snd: Virtio sound device
* Copyright (C) 2021 OpenSynergy GmbH
*/
#ifndef VIRTIO_SND_PCM_H
#define VIRTIO_SND_PCM_H
#include <linux/atomic.h>
#include <linux/virtio_config.h>
#include <sound/pcm.h>
struct virtio_pcm;
struct virtio_pcm_msg;
/**
* struct virtio_pcm_substream - VirtIO PCM substream.
* @snd: VirtIO sound device.
* @nid: Function group node identifier.
* @sid: Stream identifier.
* @direction: Stream data flow direction (SNDRV_PCM_STREAM_XXX).
* @features: Stream VirtIO feature bit map (1 << VIRTIO_SND_PCM_F_XXX).
* @substream: Kernel ALSA substream.
* @hw: Kernel ALSA substream hardware descriptor.
* @elapsed_period: Kernel work to handle the elapsed period state.
*/
struct virtio_pcm_substream {
struct virtio_snd *snd;
u32 nid;
u32 sid;
u32 direction;
u32 features;
struct snd_pcm_substream *substream;
struct snd_pcm_hardware hw;
struct work_struct elapsed_period;
};
/**
* struct virtio_pcm_stream - VirtIO PCM stream.
* @substreams: VirtIO substreams belonging to the stream.
* @nsubstreams: Number of substreams.
*/
struct virtio_pcm_stream {
struct virtio_pcm_substream **substreams;
u32 nsubstreams;
};
/**
* struct virtio_pcm - VirtIO PCM device.
* @list: VirtIO PCM list entry.
* @nid: Function group node identifier.
* @pcm: Kernel PCM device.
* @streams: VirtIO PCM streams (playback and capture).
*/
struct virtio_pcm {
struct list_head list;
u32 nid;
struct snd_pcm *pcm;
struct virtio_pcm_stream streams[SNDRV_PCM_STREAM_LAST + 1];
};
int virtsnd_pcm_validate(struct virtio_device *vdev);
int virtsnd_pcm_parse_cfg(struct virtio_snd *snd);
int virtsnd_pcm_build_devs(struct virtio_snd *snd);
struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid);
struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid);
#endif /* VIRTIO_SND_PCM_H */
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