aboutsummaryrefslogtreecommitdiff
path: root/sound/virtio/virtio_card.h
blob: 86ef3941895ed25c9bfa1d46267bef99f2ad7101 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * virtio-snd: Virtio sound device
 * Copyright (C) 2021 OpenSynergy GmbH
 */
#ifndef VIRTIO_SND_CARD_H
#define VIRTIO_SND_CARD_H

#include <linux/slab.h>
#include <linux/virtio.h>
#include <sound/core.h>
#include <uapi/linux/virtio_snd.h>

#include "virtio_ctl_msg.h"
#include "virtio_pcm.h"

#define VIRTIO_SND_CARD_DRIVER	"virtio-snd"
#define VIRTIO_SND_CARD_NAME	"VirtIO SoundCard"
#define VIRTIO_SND_PCM_NAME	"VirtIO PCM"

struct virtio_jack;
struct virtio_pcm_substream;

/**
 * struct virtio_snd_queue - Virtqueue wrapper structure.
 * @lock: Used to synchronize access to a virtqueue.
 * @vqueue: Underlying virtqueue.
 */
struct virtio_snd_queue {
	spinlock_t lock;
	struct virtqueue *vqueue;
};

/**
 * struct virtio_snd - VirtIO sound card device.
 * @vdev: Underlying virtio device.
 * @queues: Virtqueue wrappers.
 * @card: ALSA sound card.
 * @ctl_msgs: Pending control request list.
 * @event_msgs: Device events.
 * @pcm_list: VirtIO PCM device list.
 * @jacks: VirtIO jacks.
 * @njacks: Number of jacks.
 * @substreams: VirtIO PCM substreams.
 * @nsubstreams: Number of PCM substreams.
 * @chmaps: VirtIO channel maps.
 * @nchmaps: Number of channel maps.
 */
struct virtio_snd {
	struct virtio_device *vdev;
	struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX];
	struct snd_card *card;
	struct list_head ctl_msgs;
	struct virtio_snd_event *event_msgs;
	struct list_head pcm_list;
	struct virtio_jack *jacks;
	u32 njacks;
	struct virtio_pcm_substream *substreams;
	u32 nsubstreams;
	struct virtio_snd_chmap_info *chmaps;
	u32 nchmaps;
};

/* Message completion timeout in milliseconds (module parameter). */
extern u32 virtsnd_msg_timeout_ms;

static inline struct virtio_snd_queue *
virtsnd_control_queue(struct virtio_snd *snd)
{
	return &snd->queues[VIRTIO_SND_VQ_CONTROL];
}

static inline struct virtio_snd_queue *
virtsnd_event_queue(struct virtio_snd *snd)
{
	return &snd->queues[VIRTIO_SND_VQ_EVENT];
}

static inline struct virtio_snd_queue *
virtsnd_tx_queue(struct virtio_snd *snd)
{
	return &snd->queues[VIRTIO_SND_VQ_TX];
}

static inline struct virtio_snd_queue *
virtsnd_rx_queue(struct virtio_snd *snd)
{
	return &snd->queues[VIRTIO_SND_VQ_RX];
}

static inline struct virtio_snd_queue *
virtsnd_pcm_queue(struct virtio_pcm_substream *vss)
{
	if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK)
		return virtsnd_tx_queue(vss->snd);
	else
		return virtsnd_rx_queue(vss->snd);
}

int virtsnd_jack_parse_cfg(struct virtio_snd *snd);

int virtsnd_jack_build_devs(struct virtio_snd *snd);

void virtsnd_jack_event(struct virtio_snd *snd,
			struct virtio_snd_event *event);

int virtsnd_chmap_parse_cfg(struct virtio_snd *snd);

int virtsnd_chmap_build_devs(struct virtio_snd *snd);

#endif /* VIRTIO_SND_CARD_H */