linux/sound/soc/fsl/fsl_asrc_dma.c

// SPDX-License-Identifier: GPL-2.0
//
// Freescale ASRC ALSA SoC Platform (DMA) driver
//
// Copyright (C) 2014 Freescale Semiconductor, Inc.
//
// Author: Nicolin Chen <[email protected]>

#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/dma/imx-dma.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "fsl_asrc_common.h"

#define FSL_ASRC_DMABUF_SIZE …

static struct snd_pcm_hardware snd_imx_hardware = …;

static bool filter(struct dma_chan *chan, void *param)
{ … }

static void fsl_asrc_dma_complete(void *arg)
{ … }

static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream,
					   struct snd_soc_component *component)
{ … }

static int fsl_asrc_dma_trigger(struct snd_soc_component *component,
				struct snd_pcm_substream *substream, int cmd)
{ … }

static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
				  struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params)
{ … }

static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
				struct snd_pcm_substream *substream)
{ … }

static int fsl_asrc_dma_startup(struct snd_soc_component *component,
				struct snd_pcm_substream *substream)
{ … }

static int fsl_asrc_dma_shutdown(struct snd_soc_component *component,
				 struct snd_pcm_substream *substream)
{ … }

static snd_pcm_uframes_t
fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component,
			 struct snd_pcm_substream *substream)
{ … }

static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
				struct snd_soc_pcm_runtime *rtd)
{ … }

struct snd_soc_component_driver fsl_asrc_component = …;
EXPORT_SYMBOL_GPL(…);