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 51