1/*
 2 *  Copyright (C) 2012, Analog Devices Inc.
 3 *	Author: Lars-Peter Clausen <lars@metafoo.de>
 4 *
 5 *  This program is free software; you can redistribute it and/or modify it
 6 *  under  the terms of the GNU General  Public License as published by the
 7 *  Free Software Foundation;  either version 2 of the License, or (at your
 8 *  option) any later version.
 9 *
10 *  You should have received a copy of the GNU General Public License along
11 *  with this program; if not, write to the Free Software Foundation, Inc.,
12 *  675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15#ifndef __SOUND_DMAENGINE_PCM_H__
16#define __SOUND_DMAENGINE_PCM_H__
17
18#include <sound/pcm.h>
19#include <linux/dmaengine.h>
20
21/**
22 * snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM
23 *   substream
24 * @substream: PCM substream
25 */
26static inline enum dma_transfer_direction
27snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream)
28{
29	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
30		return DMA_MEM_TO_DEV;
31	else
32		return DMA_DEV_TO_MEM;
33}
34
35void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data);
36void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream);
37
38int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
39	const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config);
40int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
41snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
42
43int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
44	dma_filter_fn filter_fn, void *filter_data);
45int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
46
47struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
48
49#endif