include/sound/dmaengine_pcm.h

   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  */
  26 static inline enum dma_transfer_direction
  27 snd_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
  35 void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data);
  36 void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream);
  37
  38 int 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);
  40 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
  41 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
  42 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
  43
  44 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
  45         dma_filter_fn filter_fn, void *filter_data);
  46 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
  47
  48 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
  49
  50 #endif