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// SPDX-License-Identifier: GPL-2.0
/*
* ALSA Virtual Soundcard
*
* alsa.h - Top level ALSA interface
*
* Copyright (C) 2010-2018 Fiberdyne Systems Pty Ltd
*/
#ifndef __AVIRT_ALSA_H__
#define __AVIRT_ALSA_H__
#include "core.h"
#include <linux/platform_device.h>
#include <sound/pcm.h>
#define PRINT_ERR(errno, errmsg, ...) \
pr_err("[%s()] %s [ERRNO:%d]", __func__, errmsg, ##__VA_ARGS__, errno);
#define CHK_ERR(errno) \
do { \
if (errno < 0) \
return errno; \
} while (0)
#define CHK_ERR_V(errno, errmsg, ...) \
do { \
if (errno < 0) { \
PRINT_ERR(errno, errmsg, ##__VA_ARGS__) \
return errno; \
} \
} while (0)
#define CHK_NULL(x) \
do { \
if (!x) \
return -EFAULT; \
} while (0)
#define CHK_NULL_V(x, errmsg, ...) \
do { \
if (!x) { \
PRINT_ERR(EFAULT, errmsg, ##__VA_ARGS__) \
return -EFAULT; \
} \
} while (0)
/**
* avirt_alsa_configure_pcm- Configure the PCM device
* @config: Device configuration structure array
* @direction: Direction of PCM (SNDRV_PCM_STREAM_XXX)
* @numdevices: Number of devices (array length)
* @return: 0 on success or error code otherwise
*/
int avirt_alsa_configure_pcm(struct avirt_alsa_devconfig *config, int direction,
unsigned numdevices);
/**
* avirt_alsa_register - Registers the ALSA driver
* @devptr: Platform driver device
* @return: 0 on success or error code otherwise
*/
int avirt_alsa_register(struct platform_device *devptr);
/**
* avirt_alsa_deregister - Deregisters the ALSA driver
* @devptr: Platform driver device
* @return: 0 on success or error code otherwise
*/
int avirt_alsa_deregister(void);
/**
* avirt_alsa_get_group - Gets the device group for the specified direction
* @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE
* @return: Either the playback or capture device group on success,
* or NULL otherwise
*/
struct avirt_alsa_group *avirt_alsa_get_group(int direction);
/**
* pcm_buff_complete_cb - PCM buffer complete callback
* @substream: pointer to ALSA PCM substream
* @return 0 on success or error code otherwise
*
* This should be called from a child Audio Path once it has finished processing
* the PCM buffer
*/
int pcm_buff_complete_cb(struct snd_pcm_substream *substream);
#endif // __AVIRT_ALSA_H__
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