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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>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* linux/sound/sdw.h -- SoundWire helpers for ALSA/ASoC
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*
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* Copyright (c) 2022 Cirrus Logic Inc.
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*
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* Author: Charles Keepax <ckeepax@opensource.cirrus.com>
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*/
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#include <linux/soundwire/sdw.h>
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#include <sound/asound.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#ifndef __INCLUDE_SOUND_SDW_H
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#define __INCLUDE_SOUND_SDW_H
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/**
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* snd_sdw_params_to_config() - Conversion from hw_params to SoundWire config
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*
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* @substream: Pointer to the PCM substream structure
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* @params: Pointer to the hardware params structure
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* @stream_config: Stream configuration for the SoundWire audio stream
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* @port_config: Port configuration for the SoundWire audio stream
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*
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* This function provides a basic conversion from the hw_params structure to
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* SoundWire configuration structures. The user will at a minimum need to also
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* set the port number in the port config, but may also override more of the
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* setup, or in the case of a complex user, not use this helper at all and
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* open-code everything.
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*/
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static inline void snd_sdw_params_to_config(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct sdw_stream_config *stream_config,
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struct sdw_port_config *port_config)
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{
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stream_config->frame_rate = params_rate(params);
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stream_config->ch_count = params_channels(params);
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stream_config->bps = snd_pcm_format_width(params_format(params));
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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stream_config->direction = SDW_DATA_DIR_RX;
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else
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stream_config->direction = SDW_DATA_DIR_TX;
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port_config->ch_mask = GENMASK(stream_config->ch_count - 1, 0);
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}
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#endif
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