mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
e7f73a1613
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 <lars@metafoo.de> Tested-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/*
|
|
* Copyright (C) 2012, Analog Devices Inc.
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* 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 <sound/pcm.h>
|
|
#include <linux/dmaengine.h>
|
|
|
|
/**
|
|
* 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
|