linux/include/sound/dmaengine_pcm.h
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   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);
  42snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
  43
  44int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
  45        dma_filter_fn filter_fn, void *filter_data);
  46int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
  47
  48struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
  49
  50#endif
  51
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