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 const struct snd_pcm_hardware dummy_dma_hardware = {
  62         /* Random values to keep userspace happy when checking constraints */
  63         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  64                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
  65         .buffer_bytes_max       = 128*1024,
  66         .period_bytes_min       = PAGE_SIZE,
  67         .period_bytes_max       = PAGE_SIZE*2,
  68         .periods_min            = 2,
  69         .periods_max            = 128,
  70 };
  71
  72 static int dummy_dma_open(struct snd_pcm_substream *substream)
  73 {
  74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  75
  76         /* BE's dont need dummy params */
  77         if (!rtd->dai_link->no_pcm)
  78                 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
  79
  80         return 0;
  81 }
  82
  83 static struct snd_pcm_ops dummy_dma_ops = {
  84         .open           = dummy_dma_open,
  85         .ioctl          = snd_pcm_lib_ioctl,
  86 };
  87
  88 static struct snd_soc_platform_driver dummy_platform = {
  89         .ops = &dummy_dma_ops,
  90 };
  91
  92 static 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)
 104 /*
 105  * The dummy CODEC is only meant to be used in situations where there is no
 106  * actual hardware.
 107  *
 108  * If there is actual hardware even if it does not have a control bus
 109  * the hardware will still have constraints like supported samplerates, etc.
 110  * which should be modelled. And the data flow graph also should be modelled
 111  * using DAPM.
 112  */
 113 static struct snd_soc_dai_driver dummy_dai = {
 114         .name = "snd-soc-dummy-dai",
 115         .playback = {
 116                 .stream_name    = "Playback",
 117                 .channels_min   = 1,
 118                 .channels_max   = 384,
 119                 .rates          = STUB_RATES,
 120                 .formats        = STUB_FORMATS,
 121         },
 122         .capture = {
 123                 .stream_name    = "Capture",
 124                 .channels_min   = 1,
 125                 .channels_max   = 384,
 126                 .rates = STUB_RATES,
 127                 .formats = STUB_FORMATS,
 128          },
 129 };
 130
 131 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
 132 {
 133         if (dai->driver == &dummy_dai)
 134                 return 1;
 135         return 0;
 136 }
 137
 138 static int snd_soc_dummy_probe(struct platform_device *pdev)
 139 {
 140         int ret;
 141
 142         ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
 143         if (ret < 0)
 144                 return ret;
 145
 146         ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
 147         if (ret < 0) {
 148                 snd_soc_unregister_codec(&pdev->dev);
 149                 return ret;
 150         }
 151
 152         return ret;
 153 }
 154
 155 static int snd_soc_dummy_remove(struct platform_device *pdev)
 156 {
 157         snd_soc_unregister_platform(&pdev->dev);
 158         snd_soc_unregister_codec(&pdev->dev);
 159
 160         return 0;
 161 }
 162
 163 static struct platform_driver soc_dummy_driver = {
 164         .driver = {
 165                 .name = "snd-soc-dummy",
 166         },
 167         .probe = snd_soc_dummy_probe,
 168         .remove = snd_soc_dummy_remove,
 169 };
 170
 171 static struct platform_device *soc_dummy_dev;
 172
 173 int __init snd_soc_util_init(void)
 174 {
 175         int ret;
 176
 177         soc_dummy_dev =
 178                 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
 179         if (IS_ERR(soc_dummy_dev))
 180                 return PTR_ERR(soc_dummy_dev);
 181
 182         ret = platform_driver_register(&soc_dummy_driver);
 183         if (ret != 0)
 184                 platform_device_unregister(soc_dummy_dev);
 185
 186         return ret;
 187 }
 188
 189 void __exit snd_soc_util_exit(void)
 190 {
 191         platform_device_unregister(soc_dummy_dev);
 192         platform_driver_unregister(&soc_dummy_driver);
 193 }