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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.
- * @lock: Spinlock that protects fields shared by interrupt handlers and
- * substream operators.
- * @buffer_bytes: Current buffer size in bytes.
- * @hw_ptr: Substream hardware pointer value in bytes [0 ... buffer_bytes).
- * @xfer_enabled: Data transfer state (0 - off, 1 - on).
- * @xfer_xrun: Data underflow/overflow state (0 - no xrun, 1 - xrun).
- * @stopped: True if the substream is stopped and must be released on the device
- * side.
- * @suspended: True if the substream is suspended and must be reconfigured on
- * the device side at resume.
- * @msgs: Allocated I/O messages.
- * @nmsgs: Number of allocated I/O messages.
- * @msg_last_enqueued: Index of the last I/O message added to the virtqueue.
- * @msg_count: Number of pending I/O messages in the virtqueue.
- * @msg_empty: Notify when msg_count is zero.
- */
- 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;
- spinlock_t lock;
- size_t buffer_bytes;
- size_t hw_ptr;
- bool xfer_enabled;
- bool xfer_xrun;
- bool stopped;
- bool suspended;
- struct virtio_pcm_msg **msgs;
- unsigned int nmsgs;
- int msg_last_enqueued;
- unsigned int msg_count;
- wait_queue_head_t msg_empty;
- };
- /**
- * struct virtio_pcm_stream - VirtIO PCM stream.
- * @substreams: VirtIO substreams belonging to the stream.
- * @nsubstreams: Number of substreams.
- * @chmaps: Kernel channel maps belonging to the stream.
- * @nchmaps: Number of channel maps.
- */
- struct virtio_pcm_stream {
- struct virtio_pcm_substream **substreams;
- u32 nsubstreams;
- struct snd_pcm_chmap_elem *chmaps;
- u32 nchmaps;
- };
- /**
- * 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];
- };
- extern const struct snd_pcm_ops virtsnd_pcm_ops;
- 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);
- void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event);
- void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue);
- void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue);
- 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);
- struct virtio_snd_msg *
- virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss,
- unsigned int command, gfp_t gfp);
- int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss,
- unsigned int periods, unsigned int period_bytes);
- void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss);
- int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss);
- unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss);
- #endif /* VIRTIO_SND_PCM_H */
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