release/src-rt-6.x.4708/linux/linux-2.6.36/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         switch (params_format(params)) {
  32         case SNDRV_PCM_FORMAT_S16_LE:
  33         case SNDRV_PCM_FORMAT_S16_BE:
  34                 sample_size = 16;
  35                 break;
  36         case SNDRV_PCM_FORMAT_S20_3LE:
  37         case SNDRV_PCM_FORMAT_S20_3BE:
  38                 sample_size = 20;
  39                 break;
  40         case SNDRV_PCM_FORMAT_S24_LE:
  41         case SNDRV_PCM_FORMAT_S24_BE:
  42                 sample_size = 24;
  43                 break;
  44         case SNDRV_PCM_FORMAT_S32_LE:
  45         case SNDRV_PCM_FORMAT_S32_BE:
  46                 sample_size = 32;
  47                 break;
  48         default:
  49                 return -ENOTSUPP;
  50         }
  51
  52         return snd_soc_calc_frame_size(sample_size, params_channels(params),
  53                                        1);
  54 }
  55 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  56
  57 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  58 {
  59         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  60 }
  61 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  62
  63 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  64 {
  65         int ret;
  66
  67         ret = snd_soc_params_to_frame_size(params);
  68
  69         if (ret > 0)
  70                 return ret * params_rate(params);
  71         else
  72                 return ret;
  73 }
  74 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);