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// SPDX-License-Identifier: GPL-2.0
/*
* AVIRT - ALSA Virtual Soundcard
*
* Copyright (c) 2010-2018 Fiberdyne Systems Pty Ltd
*
* core.h - AVIRT internal header
*/
#ifndef __SOUND_AVIRT_CORE_H
#define __SOUND_AVIRT_CORE_H
#include <sound/avirt.h>
#include "utils.h"
extern struct snd_pcm_ops pcm_ops;
struct snd_avirt_core {
int version[3];
struct snd_card *card;
struct device *dev;
struct class *avirt_class;
struct config_group *stream_group;
unsigned int stream_count;
bool streams_sealed;
};
/**
* snd_avirt_configfs_init - Initialise the configfs system
* @core: The snd_avirt_core pointer
* @return: 0 on success, negative ERRNO on failure
*/
int __init snd_avirt_configfs_init(struct snd_avirt_core *core);
/**
* snd_avirt_configfs_exit - Clean up and exit the configfs system
* @core: The snd_avirt_core pointer
*/
void __exit snd_avirt_configfs_exit(struct snd_avirt_core *core);
/**
* snd_avirt_streams_seal - Register the sound card to user space
* @return: 0 on success, negative ERRNO on failure
*/
int snd_avirt_streams_seal(void);
/**
* snd_avirt_streams_sealed - Check if the streams have been sealed or not
* @return: true if sealed, false otherwise
*/
bool snd_avirt_streams_sealed(void);
/**
* snd_avirt_stream_find_by_device - Get audio stream from device number
* @device: The PCM device number corresponding to the desired stream
* @return: The audio stream if found, or an error pointer otherwise
*/
struct snd_avirt_stream *snd_avirt_stream_find_by_device(unsigned int device);
/**
* snd_avirt_stream_create - Create audio stream, including it's ALSA PCM device
* @name: The name designated to the audio stream
* @direction: The PCM direction (SNDRV_PCM_STREAM_PLAYBACK or
* SNDRV_PCM_STREAM_CAPTURE)
* @return: The newly created audio stream if successful, or an error pointer
*/
struct snd_avirt_stream *snd_avirt_stream_create(const char *name,
int direction);
/**
* snd_avirt_audiopath_get - retrieves the Audio Path by it's UID
* @uid: Unique ID for the Audio Path
* @return: Corresponding Audio Path
*/
struct snd_avirt_audiopath *snd_avirt_audiopath_get(const char *uid);
/**
* snd_avirt_stream_from_config_item - Convert config_item to a snd_avirt_stream
* @item: The config_item to convert from
* @return: The item's snd_avirt_stream if successful, NULL otherwise
*/
static inline struct snd_avirt_stream *
snd_avirt_stream_from_config_item(struct config_item *item)
{
return item ? container_of(item, struct snd_avirt_stream, item) : NULL;
}
#endif /* __SOUND_AVIRT_CORE_H */
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