diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2012-02-22 13:49:08 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-03-02 17:47:25 +0400 |
| commit | e7f73a1613567ac82314f33956c0f3810bf1efb2 (patch) | |
| tree | 720501188147171460a37efedd5592a28248fdc2 /include/sound | |
| parent | 1355ab147fa38e4b3841469c51422e2343a877b2 (diff) | |
| download | linux-e7f73a1613567ac82314f33956c0f3810bf1efb2.tar.xz | |
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 <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>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/dmaengine_pcm.h | 49 |
1 files changed, 49 insertions, 0 deletions
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 <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 |