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Release 4.12 include/sound/dmaengine_pcm.h

Directory: include/sound
 *  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.


#include <sound/pcm.h>
#include <sound/soc.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; }


Lars-Peter Clausen29100.00%1100.00%

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); snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream); int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, struct dma_chan *chan); int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data); int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream); struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, void *filter_data); struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream); /* * The DAI supports packed transfers, eg 2 16-bit samples in a 32-bit word. * If this flag is set the dmaengine driver won't put any restriction on * the supported sample formats and set the DMA transfer size to undefined. * The DAI driver is responsible to disable any unsupported formats in it's * configuration and catch corner cases that are not already handled in * the ALSA core. */ #define SND_DMAENGINE_PCM_DAI_FLAG_PACK BIT(0) /** * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data * @addr: Address of the DAI data source or destination register. * @addr_width: Width of the DAI data source or destination register. * @maxburst: Maximum number of words(note: words, as in units of the * src_addr_width member, not bytes) that can be send to or received from the * DAI in one burst. * @slave_id: Slave requester id for the DMA channel. * @filter_data: Custom DMA channel filter data, this will usually be used when * requesting the DMA channel. * @chan_name: Custom channel name to use when requesting DMA channel. * @fifo_size: FIFO size of the DAI controller in bytes * @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now */ struct snd_dmaengine_dai_dma_data { dma_addr_t addr; enum dma_slave_buswidth addr_width; u32 maxburst; unsigned int slave_id; void *filter_data; const char *chan_name; unsigned int fifo_size; unsigned int flags; }; void snd_dmaengine_pcm_set_config_from_dai_data( const struct snd_pcm_substream *substream, const struct snd_dmaengine_dai_dma_data *dma_data, struct dma_slave_config *config); /* * Try to request the DMA channel using compat_request_channel or * compat_filter_fn if it couldn't be requested through devicetree. */ #define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0) /* * Don't try to request the DMA channels through devicetree. This flag only * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well. */ #define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1) /* * The PCM is half duplex and the DMA channel is shared between capture and * playback. */ #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3) /* * The PCM streams have custom channel names specified. */ #define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4) /** * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM * @prepare_slave_config: Callback used to fill in the DMA slave_config for a * PCM substream. Will be called from the PCM drivers hwparams callback. * @compat_request_channel: Callback to request a DMA channel for platforms * which do not use devicetree. * @compat_filter_fn: Will be used as the filter function when requesting a * channel for platforms which do not use devicetree. The filter parameter * will be the DAI's DMA data. * @dma_dev: If set, request DMA channel on this device rather than the DAI * device. * @chan_names: If set, these custom DMA channel names will be requested at * registration time. * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. * @prealloc_buffer_size: Size of the preallocated audio buffer. * * Note: If both compat_request_channel and compat_filter_fn are set * compat_request_channel will be used to request the channel and * compat_filter_fn will be ignored. Otherwise the channel will be requested * using dma_request_channel with compat_filter_fn as the filter function. */ struct snd_dmaengine_pcm_config { int (*prepare_slave_config)(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); struct dma_chan *(*compat_request_channel)( struct snd_soc_pcm_runtime *rtd, struct snd_pcm_substream *substream); dma_filter_fn compat_filter_fn; struct device *dma_dev; const char *chan_names[SNDRV_PCM_STREAM_LAST + 1]; const struct snd_pcm_hardware *pcm_hardware; unsigned int prealloc_buffer_size; }; int snd_dmaengine_pcm_register(struct device *dev, const struct snd_dmaengine_pcm_config *config, unsigned int flags); void snd_dmaengine_pcm_unregister(struct device *dev); int devm_snd_dmaengine_pcm_register(struct device *dev, const struct snd_dmaengine_pcm_config *config, unsigned int flags); int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); #endif

Overall Contributors

Lars-Peter Clausen35990.89%1076.92%
Stephen Warren164.05%17.69%
Sylwester Nawrocki112.78%17.69%
Matthias Reichl92.28%17.69%
Directory: include/sound
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