From e7f73a1613567ac82314f33956c0f3810bf1efb2 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 22 Feb 2012 10:49:08 +0100 Subject: ASoC: Add dmaengine PCM helper functions 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 Tested-by: Shawn Guo Acked-by: Vinod Koul Signed-off-by: Mark Brown --- include/sound/dmaengine_pcm.h | 49 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 include/sound/dmaengine_pcm.h (limited to 'include') diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h new file mode 100644 index 000000000000..a8fcaa6d531f --- /dev/null +++ b/include/sound/dmaengine_pcm.h @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2012, Analog Devices Inc. + * Author: Lars-Peter Clausen + * + * 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 +#include + +/** + * 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 -- cgit v1.2.3