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