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d6568e3de4
Implementation of support for audio controls in accordance with the
extension of the virtio sound device specification [1] planned for
virtio-v1.3-cs01.
The device can announce the VIRTIO_SND_F_CTLS feature. If the feature is
negotiated, then an additional field appears in the configuration space:
struct virtio_snd_config {
...
/* number of available control elements */
__le32 controls;
};
The driver can send the following requests to manage audio controls:
enum {
...
/* control element request types */
VIRTIO_SND_R_CTL_INFO = 0x0300,
VIRTIO_SND_R_CTL_ENUM_ITEMS,
VIRTIO_SND_R_CTL_READ,
VIRTIO_SND_R_CTL_WRITE,
VIRTIO_SND_R_CTL_TLV_READ,
VIRTIO_SND_R_CTL_TLV_WRITE,
VIRTIO_SND_R_CTL_TLV_COMMAND,
...
};
And the device can send the following audio control event notification:
enum {
...
/* control element event types */
VIRTIO_SND_EVT_CTL_NOTIFY = 0x1200,
...
};
See additional details in [1].
[1] https://lists.oasis-open.org/archives/virtio-comment/202104/msg00013.html
Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com>
Signed-off-by: Aiswarya Cyriac <aiswarya.cyriac@opensynergy.com>
Link: https://lore.kernel.org/r/20240115133654.576068-2-aiswarya.cyriac@opensynergy.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
134 lines
3.3 KiB
C
134 lines
3.3 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_CARD_H
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#define VIRTIO_SND_CARD_H
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#include <linux/slab.h>
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#include <linux/virtio.h>
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#include <sound/core.h>
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#include <uapi/linux/virtio_snd.h>
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#include "virtio_ctl_msg.h"
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#include "virtio_pcm.h"
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#define VIRTIO_SND_CARD_DRIVER "virtio-snd"
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#define VIRTIO_SND_CARD_NAME "VirtIO SoundCard"
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#define VIRTIO_SND_PCM_NAME "VirtIO PCM"
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struct virtio_jack;
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struct virtio_pcm_substream;
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/**
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* struct virtio_snd_queue - Virtqueue wrapper structure.
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* @lock: Used to synchronize access to a virtqueue.
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* @vqueue: Underlying virtqueue.
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*/
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struct virtio_snd_queue {
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spinlock_t lock;
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struct virtqueue *vqueue;
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};
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/**
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* struct virtio_kctl - VirtIO control element.
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* @kctl: ALSA control element.
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* @items: Items for the ENUMERATED element type.
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*/
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struct virtio_kctl {
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struct snd_kcontrol *kctl;
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struct virtio_snd_ctl_enum_item *items;
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};
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/**
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* struct virtio_snd - VirtIO sound card device.
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* @vdev: Underlying virtio device.
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* @queues: Virtqueue wrappers.
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* @card: ALSA sound card.
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* @ctl_msgs: Pending control request list.
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* @event_msgs: Device events.
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* @pcm_list: VirtIO PCM device list.
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* @jacks: VirtIO jacks.
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* @njacks: Number of jacks.
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* @substreams: VirtIO PCM substreams.
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* @nsubstreams: Number of PCM substreams.
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* @chmaps: VirtIO channel maps.
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* @nchmaps: Number of channel maps.
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* @kctl_infos: VirtIO control element information.
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* @kctls: VirtIO control elements.
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* @nkctls: Number of control elements.
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*/
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struct virtio_snd {
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struct virtio_device *vdev;
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struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX];
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struct snd_card *card;
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struct list_head ctl_msgs;
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struct virtio_snd_event *event_msgs;
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struct list_head pcm_list;
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struct virtio_jack *jacks;
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u32 njacks;
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struct virtio_pcm_substream *substreams;
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u32 nsubstreams;
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struct virtio_snd_chmap_info *chmaps;
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u32 nchmaps;
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struct virtio_snd_ctl_info *kctl_infos;
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struct virtio_kctl *kctls;
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u32 nkctls;
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};
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/* Message completion timeout in milliseconds (module parameter). */
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extern u32 virtsnd_msg_timeout_ms;
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static inline struct virtio_snd_queue *
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virtsnd_control_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_CONTROL];
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}
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static inline struct virtio_snd_queue *
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virtsnd_event_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_EVENT];
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}
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static inline struct virtio_snd_queue *
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virtsnd_tx_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_TX];
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}
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static inline struct virtio_snd_queue *
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virtsnd_rx_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_RX];
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}
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static inline struct virtio_snd_queue *
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virtsnd_pcm_queue(struct virtio_pcm_substream *vss)
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{
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if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK)
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return virtsnd_tx_queue(vss->snd);
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else
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return virtsnd_rx_queue(vss->snd);
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}
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int virtsnd_jack_parse_cfg(struct virtio_snd *snd);
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int virtsnd_jack_build_devs(struct virtio_snd *snd);
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void virtsnd_jack_event(struct virtio_snd *snd,
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struct virtio_snd_event *event);
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int virtsnd_chmap_parse_cfg(struct virtio_snd *snd);
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int virtsnd_chmap_build_devs(struct virtio_snd *snd);
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int virtsnd_kctl_parse_cfg(struct virtio_snd *snd);
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int virtsnd_kctl_build_devs(struct virtio_snd *snd);
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void virtsnd_kctl_event(struct virtio_snd *snd, struct virtio_snd_event *event);
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#endif /* VIRTIO_SND_CARD_H */
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