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Many devices need to calculate the bit clock rate desired to work out the clock configuration required for the device. Provide utility functions to do this using both hw_params structures and raw numbers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* soc-util.c -- ALSA SoC Audio Layer utility functions
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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* Liam Girdwood <lrg@slimlogic.co.uk>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
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{
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return sample_size * channels * tdm_slots;
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}
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EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
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int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
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{
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int sample_size;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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sample_size = 16;
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break;
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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sample_size = 20;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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sample_size = 24;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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sample_size = 32;
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break;
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default:
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return -ENOTSUPP;
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}
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return snd_soc_calc_frame_size(sample_size, params_channels(params),
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1);
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}
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EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
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int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
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{
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int ret;
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ret = snd_soc_params_to_frame_size(params);
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if (ret > 0)
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return ret * params_rate(params);
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else
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
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