dmaengine_pcm.h

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/*
 *  Copyright (C) 2012, Analog Devices Inc.
 *  Author: Lars-Peter Clausen <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#ifndef __SOUND_DMAENGINE_PCM_H__
#define __SOUND_DMAENGINE_PCM_H__

#include <sound/pcm.h>
#include <linux/dmaengine.h>

static inline enum dma_transfer_direction
snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream)
{
    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
        return DMA_MEM_TO_DEV;
    else
        return DMA_DEV_TO_MEM;
}

void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data);
void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream);

int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
    const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config);
int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);

int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
    dma_filter_fn filter_fn, void *filter_data);
int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);

struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);

#endif