128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/* 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>
|
|
#include <sound/pcm-indirect.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.
|
|
* @pcm_indirect: Kernel indirect pcm structure.
|
|
* @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_indirect pcm_indirect;
|
|
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;
|
|
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 long offset,
|
|
unsigned long bytes);
|
|
|
|
unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss);
|
|
|
|
#endif /* VIRTIO_SND_PCM_H */
|