tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
26static inline enum dma_transfer_direction
27snd_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
35void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data);
36void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream);
37
38int 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);
40int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
41snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
42snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
43
44int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
45 dma_filter_fn filter_fn, void *filter_data);
46int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
47
48struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
49
50#endif