sound/soc/soc-utils.c

   1 /*
   2  * soc-util.c  --  ALSA SoC Audio Layer utility functions
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *         Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  */
  15
  16 #include <sound/core.h>
  17 #include <sound/pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20
  21 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  22 {
  23         return sample_size * channels * tdm_slots;
  24 }
  25 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  26
  27 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
  28 {
  29         int sample_size;
  30
  31         sample_size = snd_pcm_format_width(params_format(params));
  32         if (sample_size < 0)
  33                 return sample_size;
  34
  35         return snd_soc_calc_frame_size(sample_size, params_channels(params),
  36                                        1);
  37 }
  38 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  39
  40 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  41 {
  42         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  43 }
  44 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  45
  46 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  47 {
  48         int ret;
  49
  50         ret = snd_soc_params_to_frame_size(params);
  51
  52         if (ret > 0)
  53                 return ret * params_rate(params);
  54         else
  55                 return ret;
  56 }
  57 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);