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sound: sdw: Add hw_params to SoundWire config helper function

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The vast majority of the current users of the SoundWire framework
have almost identical code for converting from hw_params to SoundWire
configuration. Whilst complex devices might require more, it is very
likely that most new devices will follow the same pattern. Save a
little code by factoring this out into a helper function.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20221123165432.594972-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Charles Keepax 2022-11-23 16:54:24 +00:00 committed by Mark Brown
parent d695d089e3
commit e45875168d
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1 changed files with 49 additions and 0 deletions
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include/sound/sdw.h Normal file
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/* SPDX-License-Identifier: GPL-2.0
*
* linux/sound/sdw.h -- SoundWire helpers for ALSA/ASoC
*
* Copyright (c) 2022 Cirrus Logic Inc.
*
* Author: Charles Keepax <ckeepax@opensource.cirrus.com>
*/
#include <linux/soundwire/sdw.h>
#include <sound/asound.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#ifndef __INCLUDE_SOUND_SDW_H
#define __INCLUDE_SOUND_SDW_H
/**
* snd_sdw_params_to_config() - Conversion from hw_params to SoundWire config
*
* @substream: Pointer to the PCM substream structure
* @params: Pointer to the hardware params structure
* @stream_config: Stream configuration for the SoundWire audio stream
* @port_config: Port configuration for the SoundWire audio stream
*
* This function provides a basic conversion from the hw_params structure to
* SoundWire configuration structures. The user will at a minimum need to also
* set the port number in the port config, but may also override more of the
* setup, or in the case of a complex user, not use this helper at all and
* open-code everything.
*/
static inline void snd_sdw_params_to_config(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct sdw_stream_config *stream_config,
struct sdw_port_config *port_config)
{
stream_config->frame_rate = params_rate(params);
stream_config->ch_count = params_channels(params);
stream_config->bps = snd_pcm_format_width(params_format(params));
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
stream_config->direction = SDW_DATA_DIR_RX;
else
stream_config->direction = SDW_DATA_DIR_TX;
port_config->ch_mask = GENMASK(stream_config->ch_count - 1, 0);
}
#endif