125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* virtio-snd: Virtio sound device
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* Copyright (C) 2021 OpenSynergy GmbH
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*/
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#ifndef VIRTIO_SND_PCM_H
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#define VIRTIO_SND_PCM_H
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#include <linux/atomic.h>
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#include <linux/virtio_config.h>
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#include <sound/pcm.h>
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struct virtio_pcm;
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struct virtio_pcm_msg;
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/**
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* struct virtio_pcm_substream - VirtIO PCM substream.
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* @snd: VirtIO sound device.
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* @nid: Function group node identifier.
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* @sid: Stream identifier.
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* @direction: Stream data flow direction (SNDRV_PCM_STREAM_XXX).
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* @features: Stream VirtIO feature bit map (1 << VIRTIO_SND_PCM_F_XXX).
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* @substream: Kernel ALSA substream.
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* @hw: Kernel ALSA substream hardware descriptor.
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* @elapsed_period: Kernel work to handle the elapsed period state.
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* @lock: Spinlock that protects fields shared by interrupt handlers and
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* substream operators.
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* @buffer_bytes: Current buffer size in bytes.
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* @hw_ptr: Substream hardware pointer value in bytes [0 ... buffer_bytes).
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* @xfer_enabled: Data transfer state (0 - off, 1 - on).
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* @xfer_xrun: Data underflow/overflow state (0 - no xrun, 1 - xrun).
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* @stopped: True if the substream is stopped and must be released on the device
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* side.
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* @suspended: True if the substream is suspended and must be reconfigured on
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* the device side at resume.
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* @msgs: Allocated I/O messages.
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* @nmsgs: Number of allocated I/O messages.
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* @msg_last_enqueued: Index of the last I/O message added to the virtqueue.
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* @msg_count: Number of pending I/O messages in the virtqueue.
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* @msg_empty: Notify when msg_count is zero.
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*/
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struct virtio_pcm_substream {
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struct virtio_snd *snd;
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u32 nid;
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u32 sid;
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u32 direction;
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u32 features;
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struct snd_pcm_substream *substream;
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struct snd_pcm_hardware hw;
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struct work_struct elapsed_period;
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spinlock_t lock;
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size_t buffer_bytes;
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size_t hw_ptr;
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bool xfer_enabled;
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bool xfer_xrun;
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bool stopped;
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bool suspended;
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struct virtio_pcm_msg **msgs;
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unsigned int nmsgs;
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int msg_last_enqueued;
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unsigned int msg_count;
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wait_queue_head_t msg_empty;
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};
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/**
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* struct virtio_pcm_stream - VirtIO PCM stream.
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* @substreams: VirtIO substreams belonging to the stream.
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* @nsubstreams: Number of substreams.
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* @chmaps: Kernel channel maps belonging to the stream.
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* @nchmaps: Number of channel maps.
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*/
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struct virtio_pcm_stream {
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struct virtio_pcm_substream **substreams;
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u32 nsubstreams;
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struct snd_pcm_chmap_elem *chmaps;
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u32 nchmaps;
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};
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/**
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* struct virtio_pcm - VirtIO PCM device.
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* @list: VirtIO PCM list entry.
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* @nid: Function group node identifier.
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* @pcm: Kernel PCM device.
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* @streams: VirtIO PCM streams (playback and capture).
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*/
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struct virtio_pcm {
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struct list_head list;
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u32 nid;
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struct snd_pcm *pcm;
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struct virtio_pcm_stream streams[SNDRV_PCM_STREAM_LAST + 1];
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};
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extern const struct snd_pcm_ops virtsnd_pcm_ops;
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int virtsnd_pcm_validate(struct virtio_device *vdev);
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int virtsnd_pcm_parse_cfg(struct virtio_snd *snd);
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int virtsnd_pcm_build_devs(struct virtio_snd *snd);
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void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event);
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void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue);
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void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue);
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struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid);
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struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid);
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struct virtio_snd_msg *
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virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss,
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unsigned int command, gfp_t gfp);
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int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss,
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unsigned int periods, unsigned int period_bytes);
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void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss);
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int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss);
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unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss);
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#endif /* VIRTIO_SND_PCM_H */
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