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ASoC: Add dmaengine PCM helper functions

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This patch adds a set of functions which are intended to be used when
implementing a dmaengine based sound PCM driver.

Signed-off-by: Lars-Peter Clausen <[email protected]>
Tested-by: Shawn Guo <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Lars-Peter Clausen 2012-02-22 10:49:08 +01:00 • committed by Mark Brown
commit e7f73a1613
4 changed files with 342 additions and 0 deletions
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49
include/sound/dmaengine_pcm.h Normal file
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/*
* Copyright (C) 2012, Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* 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>
/**
* snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM
* substream
* @substream: PCM substream
*/
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);
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