1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
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2 | /* |
3 | * virtio-snd: Virtio sound device |
4 | * Copyright (C) 2021 OpenSynergy GmbH |
5 | */ |
6 | #ifndef VIRTIO_SND_CARD_H |
7 | #define VIRTIO_SND_CARD_H |
8 | |
9 | #include <linux/slab.h> |
10 | #include <linux/virtio.h> |
11 | #include <sound/core.h> |
12 | #include <uapi/linux/virtio_snd.h> |
13 | |
14 | #include "virtio_ctl_msg.h" |
15 | #include "virtio_pcm.h" |
16 | |
17 | #define VIRTIO_SND_CARD_DRIVER "virtio-snd" |
18 | #define VIRTIO_SND_CARD_NAME "VirtIO SoundCard" |
19 | #define VIRTIO_SND_PCM_NAME "VirtIO PCM" |
20 | |
21 | struct virtio_jack; |
22 | struct virtio_pcm_substream; |
23 | |
24 | /** |
25 | * struct virtio_snd_queue - Virtqueue wrapper structure. |
26 | * @lock: Used to synchronize access to a virtqueue. |
27 | * @vqueue: Underlying virtqueue. |
28 | */ |
29 | struct virtio_snd_queue { |
30 | spinlock_t lock; |
31 | struct virtqueue *vqueue; |
32 | }; |
33 | |
34 | /** |
35 | * struct virtio_kctl - VirtIO control element. |
36 | * @kctl: ALSA control element. |
37 | * @items: Items for the ENUMERATED element type. |
38 | */ |
39 | struct virtio_kctl { |
40 | struct snd_kcontrol *kctl; |
41 | struct virtio_snd_ctl_enum_item *items; |
42 | }; |
43 | |
44 | /** |
45 | * struct virtio_snd - VirtIO sound card device. |
46 | * @vdev: Underlying virtio device. |
47 | * @queues: Virtqueue wrappers. |
48 | * @card: ALSA sound card. |
49 | * @ctl_msgs: Pending control request list. |
50 | * @event_msgs: Device events. |
51 | * @pcm_list: VirtIO PCM device list. |
52 | * @jacks: VirtIO jacks. |
53 | * @njacks: Number of jacks. |
54 | * @substreams: VirtIO PCM substreams. |
55 | * @nsubstreams: Number of PCM substreams. |
56 | * @chmaps: VirtIO channel maps. |
57 | * @nchmaps: Number of channel maps. |
58 | * @kctl_infos: VirtIO control element information. |
59 | * @kctls: VirtIO control elements. |
60 | * @nkctls: Number of control elements. |
61 | */ |
62 | struct virtio_snd { |
63 | struct virtio_device *vdev; |
64 | struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX]; |
65 | struct snd_card *card; |
66 | struct list_head ctl_msgs; |
67 | struct virtio_snd_event *event_msgs; |
68 | struct list_head pcm_list; |
69 | struct virtio_jack *jacks; |
70 | u32 njacks; |
71 | struct virtio_pcm_substream *substreams; |
72 | u32 nsubstreams; |
73 | struct virtio_snd_chmap_info *chmaps; |
74 | u32 nchmaps; |
75 | struct virtio_snd_ctl_info *kctl_infos; |
76 | struct virtio_kctl *kctls; |
77 | u32 nkctls; |
78 | }; |
79 | |
80 | /* Message completion timeout in milliseconds (module parameter). */ |
81 | extern u32 virtsnd_msg_timeout_ms; |
82 | |
83 | static inline struct virtio_snd_queue * |
84 | virtsnd_control_queue(struct virtio_snd *snd) |
85 | { |
86 | return &snd->queues[VIRTIO_SND_VQ_CONTROL]; |
87 | } |
88 | |
89 | static inline struct virtio_snd_queue * |
90 | virtsnd_event_queue(struct virtio_snd *snd) |
91 | { |
92 | return &snd->queues[VIRTIO_SND_VQ_EVENT]; |
93 | } |
94 | |
95 | static inline struct virtio_snd_queue * |
96 | virtsnd_tx_queue(struct virtio_snd *snd) |
97 | { |
98 | return &snd->queues[VIRTIO_SND_VQ_TX]; |
99 | } |
100 | |
101 | static inline struct virtio_snd_queue * |
102 | virtsnd_rx_queue(struct virtio_snd *snd) |
103 | { |
104 | return &snd->queues[VIRTIO_SND_VQ_RX]; |
105 | } |
106 | |
107 | static inline struct virtio_snd_queue * |
108 | virtsnd_pcm_queue(struct virtio_pcm_substream *vss) |
109 | { |
110 | if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK) |
111 | return virtsnd_tx_queue(snd: vss->snd); |
112 | else |
113 | return virtsnd_rx_queue(snd: vss->snd); |
114 | } |
115 | |
116 | int virtsnd_jack_parse_cfg(struct virtio_snd *snd); |
117 | |
118 | int virtsnd_jack_build_devs(struct virtio_snd *snd); |
119 | |
120 | void virtsnd_jack_event(struct virtio_snd *snd, |
121 | struct virtio_snd_event *event); |
122 | |
123 | int virtsnd_chmap_parse_cfg(struct virtio_snd *snd); |
124 | |
125 | int virtsnd_chmap_build_devs(struct virtio_snd *snd); |
126 | |
127 | int virtsnd_kctl_parse_cfg(struct virtio_snd *snd); |
128 | |
129 | int virtsnd_kctl_build_devs(struct virtio_snd *snd); |
130 | |
131 | void virtsnd_kctl_event(struct virtio_snd *snd, struct virtio_snd_event *event); |
132 | |
133 | #endif /* VIRTIO_SND_CARD_H */ |
134 |