linux/sound/soc/soc-generic-dmaengine-pcm.c

// SPDX-License-Identifier: GPL-2.0+
//
//  Copyright (C) 2013, Analog Devices Inc.
//	Author: Lars-Peter Clausen <[email protected]>

#include <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>

#include <sound/dmaengine_pcm.h>

static unsigned int prealloc_buffer_size_kbytes = …;
module_param(prealloc_buffer_size_kbytes, uint, 0444);
MODULE_PARM_DESC(…) …;

/*
 * The platforms dmaengine driver does not support reporting the amount of
 * bytes that are still left to transfer.
 */
#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE …

static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
	struct snd_pcm_substream *substream)
{ … }

/**
 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 * @substream: PCM substream
 * @params: hw_params
 * @slave_config: DMA slave config to prepare
 *
 * This function can be used as a generic prepare_slave_config callback for
 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 * DAI DMA data. Internally the function will first call
 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 * hw_params, followed by snd_dmaengine_pcm_set_config_from_dai_data to fill in
 * the remaining fields based on the DAI DMA data.
 */
int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{ … }
EXPORT_SYMBOL_GPL(…);

static int dmaengine_pcm_hw_params(struct snd_soc_component *component,
				   struct snd_pcm_substream *substream,
				   struct snd_pcm_hw_params *params)
{ … }

static int
dmaengine_pcm_set_runtime_hwparams(struct snd_soc_component *component,
				   struct snd_pcm_substream *substream)
{ … }

static int dmaengine_pcm_open(struct snd_soc_component *component,
			      struct snd_pcm_substream *substream)
{ … }

static int dmaengine_pcm_close(struct snd_soc_component *component,
			       struct snd_pcm_substream *substream)
{ … }

static int dmaengine_pcm_trigger(struct snd_soc_component *component,
				 struct snd_pcm_substream *substream, int cmd)
{ … }

static struct dma_chan *dmaengine_pcm_compat_request_channel(
	struct snd_soc_component *component,
	struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_substream *substream)
{ … }

static bool dmaengine_pcm_can_report_residue(struct device *dev,
	struct dma_chan *chan)
{ … }

static int dmaengine_pcm_new(struct snd_soc_component *component,
			     struct snd_soc_pcm_runtime *rtd)
{ … }

static snd_pcm_uframes_t dmaengine_pcm_pointer(
	struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
{ … }

static int dmaengine_copy(struct snd_soc_component *component,
			  struct snd_pcm_substream *substream,
			  int channel, unsigned long hwoff,
			  struct iov_iter *iter, unsigned long bytes)
{ … }

static int dmaengine_pcm_sync_stop(struct snd_soc_component *component,
				   struct snd_pcm_substream *substream)
{ … }

static const struct snd_soc_component_driver dmaengine_pcm_component = …;

static const struct snd_soc_component_driver dmaengine_pcm_component_process = …;

static const char * const dmaengine_pcm_dma_channel_names[] = …;

static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
	struct device *dev, const struct snd_dmaengine_pcm_config *config)
{ … }

static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
{ … }

static const struct snd_dmaengine_pcm_config snd_dmaengine_pcm_default_config = …;

/**
 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
 * @dev: The parent device for the PCM device
 * @config: Platform specific PCM configuration
 * @flags: Platform specific quirks
 */
int snd_dmaengine_pcm_register(struct device *dev,
	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
 * @dev: Parent device the PCM was register with
 *
 * Removes a dmaengine based PCM device previously registered with
 * snd_dmaengine_pcm_register.
 */
void snd_dmaengine_pcm_unregister(struct device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;