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author | Charles Keepax <ckeepax@opensource.cirrus.com> | 2022-11-23 19:54:24 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2022-11-28 16:04:24 +0300 |
commit | e45875168d19051ebf0fc4b091da6256f3ea3669 (patch) | |
tree | 163263baed456ecc48d067e1511570c96f011b36 /include/sound/sdw.h | |
parent | d695d089e35e28f3f0ed4595a242922cc28f9b20 (diff) | |
download | linux-e45875168d19051ebf0fc4b091da6256f3ea3669.tar.xz |
sound: sdw: Add hw_params to SoundWire config helper function
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>
Diffstat (limited to 'include/sound/sdw.h')
-rw-r--r-- | include/sound/sdw.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/sound/sdw.h b/include/sound/sdw.h new file mode 100644 index 000000000000..6dcdb3228dba --- /dev/null +++ b/include/sound/sdw.h @@ -0,0 +1,49 @@ +/* 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 |