linux/sound/soc/soc-utils.c
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   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
  23int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  24{
  25        return sample_size * channels * tdm_slots;
  26}
  27EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  28
  29int 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}
  40EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  41
  42int 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}
  46EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  47
  48int 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}
  59EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
  60
  61static const struct snd_pcm_hardware dummy_dma_hardware = {
  62        .formats                = 0xffffffff,
  63        .channels_min           = 1,
  64        .channels_max           = UINT_MAX,
  65
  66        /* Random values to keep userspace happy when checking constraints */
  67        .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  68                                  SNDRV_PCM_INFO_BLOCK_TRANSFER,
  69        .buffer_bytes_max       = 128*1024,
  70        .period_bytes_min       = PAGE_SIZE,
  71        .period_bytes_max       = PAGE_SIZE*2,
  72        .periods_min            = 2,
  73        .periods_max            = 128,
  74};
  75
  76static int dummy_dma_open(struct snd_pcm_substream *substream)
  77{
  78        snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
  79
  80        return 0;
  81}
  82
  83static struct snd_pcm_ops dummy_dma_ops = {
  84        .open           = dummy_dma_open,
  85        .ioctl          = snd_pcm_lib_ioctl,
  86};
  87
  88static struct snd_soc_platform_driver dummy_platform = {
  89        .ops = &dummy_dma_ops,
  90};
  91
  92static struct snd_soc_codec_driver dummy_codec;
  93
  94#define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  95#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
  96                        SNDRV_PCM_FMTBIT_U8 | \
  97                        SNDRV_PCM_FMTBIT_S16_LE | \
  98                        SNDRV_PCM_FMTBIT_U16_LE | \
  99                        SNDRV_PCM_FMTBIT_S24_LE | \
 100                        SNDRV_PCM_FMTBIT_U24_LE | \
 101                        SNDRV_PCM_FMTBIT_S32_LE | \
 102                        SNDRV_PCM_FMTBIT_U32_LE | \
 103                        SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 104static struct snd_soc_dai_driver dummy_dai = {
 105        .name = "snd-soc-dummy-dai",
 106        .playback = {
 107                .stream_name    = "Playback",
 108                .channels_min   = 1,
 109                .channels_max   = 384,
 110                .rates          = STUB_RATES,
 111                .formats        = STUB_FORMATS,
 112        },
 113        .capture = {
 114                .stream_name    = "Capture",
 115                .channels_min   = 1,
 116                .channels_max   = 384,
 117                .rates = STUB_RATES,
 118                .formats = STUB_FORMATS,
 119         },
 120};
 121
 122static int snd_soc_dummy_probe(struct platform_device *pdev)
 123{
 124        int ret;
 125
 126        ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
 127        if (ret < 0)
 128                return ret;
 129
 130        ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
 131        if (ret < 0) {
 132                snd_soc_unregister_codec(&pdev->dev);
 133                return ret;
 134        }
 135
 136        return ret;
 137}
 138
 139static int snd_soc_dummy_remove(struct platform_device *pdev)
 140{
 141        snd_soc_unregister_platform(&pdev->dev);
 142        snd_soc_unregister_codec(&pdev->dev);
 143
 144        return 0;
 145}
 146
 147static struct platform_driver soc_dummy_driver = {
 148        .driver = {
 149                .name = "snd-soc-dummy",
 150                .owner = THIS_MODULE,
 151        },
 152        .probe = snd_soc_dummy_probe,
 153        .remove = snd_soc_dummy_remove,
 154};
 155
 156static struct platform_device *soc_dummy_dev;
 157
 158int __init snd_soc_util_init(void)
 159{
 160        int ret;
 161
 162        soc_dummy_dev =
 163                platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
 164        if (IS_ERR(soc_dummy_dev))
 165                return PTR_ERR(soc_dummy_dev);
 166
 167        ret = platform_driver_register(&soc_dummy_driver);
 168        if (ret != 0)
 169                platform_device_unregister(soc_dummy_dev);
 170
 171        return ret;
 172}
 173
 174void __exit snd_soc_util_exit(void)
 175{
 176        platform_device_unregister(soc_dummy_dev);
 177        platform_driver_unregister(&soc_dummy_driver);
 178}
 179
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