linux/sound/soc/sti/uniperif_reader.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) STMicroelectronics SA 2015
 * Authors: Arnaud Pouliquen <[email protected]>
 *          for STMicroelectronics.
 */

#include <sound/soc.h>

#include "uniperif.h"

#define UNIPERIF_READER_I2S_IN …
/*
 * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
 * integrate unireader capability in term of rate and supported channels
 */
static const struct snd_pcm_hardware uni_reader_pcm_hw = …;

/*
 * uni_reader_irq_handler
 * In case of error audio stream is stopped; stop action is protected via PCM
 * stream lock  to avoid race condition with trigger callback.
 */
static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
{ … }

static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime,
				  struct uniperif *reader)
{ … }

static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime,
				  struct uniperif *reader)
{ … }

static int uni_reader_prepare(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{ … }

static int uni_reader_start(struct uniperif *reader)
{ … }

static int uni_reader_stop(struct uniperif *reader)
{ … }

static int  uni_reader_trigger(struct snd_pcm_substream *substream,
			       int cmd, struct snd_soc_dai *dai)
{ … }

static int uni_reader_startup(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{ … }

static void uni_reader_shutdown(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{ … }

static const struct snd_soc_dai_ops uni_reader_dai_ops = …;

int uni_reader_init(struct platform_device *pdev,
		    struct uniperif *reader)
{ … }
EXPORT_SYMBOL_GPL(…);