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 <linux/platform_device.h>
  17 #include <linux/export.h>
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/pcm_params.h>
  21 #include <sound/soc.h>
  22
  23 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  24 {
  25         return sample_size * channels * tdm_slots;
  26 }
  27 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  28
  29 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
  30 {
  31         int sample_size;
  32
  33         sample_size = snd_pcm_format_width(params_format(params));
  34         if (sample_size < 0)
  35                 return sample_size;
  36
  37         return snd_soc_calc_frame_size(sample_size, params_channels(params),
  38                                        1);
  39 }
  40 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  41
  42 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  43 {
  44         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  45 }
  46 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  47
  48 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  49 {
  50         int ret;
  51
  52         ret = snd_soc_params_to_frame_size(params);
  53
  54         if (ret > 0)
  55                 return ret * params_rate(params);
  56         else
  57                 return ret;
  58 }
  59 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
  60
  61 static struct snd_soc_platform_driver dummy_platform;
  62
  63 static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
  64 {
  65         return snd_soc_register_platform(&pdev->dev, &dummy_platform);
  66 }
  67
  68 static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
  69 {
  70         snd_soc_unregister_platform(&pdev->dev);
  71
  72         return 0;
  73 }
  74
  75 static struct platform_driver soc_dummy_driver = {
  76         .driver = {
  77                 .name = "snd-soc-dummy",
  78                 .owner = THIS_MODULE,
  79         },
  80         .probe = snd_soc_dummy_probe,
  81         .remove = __devexit_p(snd_soc_dummy_remove),
  82 };
  83
  84 static struct platform_device *soc_dummy_dev;
  85
  86 int __init snd_soc_util_init(void)
  87 {
  88         int ret;
  89
  90         soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
  91         if (!soc_dummy_dev)
  92                 return -ENOMEM;
  93
  94         ret = platform_device_add(soc_dummy_dev);
  95         if (ret != 0) {
  96                 platform_device_put(soc_dummy_dev);
  97                 return ret;
  98         }
  99
 100         ret = platform_driver_register(&soc_dummy_driver);
 101         if (ret != 0)
 102                 platform_device_unregister(soc_dummy_dev);
 103
 104         return ret;
 105 }
 106
 107 void __exit snd_soc_util_exit(void)
 108 {
 109         platform_device_unregister(soc_dummy_dev);
 110         platform_driver_unregister(&soc_dummy_driver);
 111 }