sound/soc/soc-utils.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-util.c  --  ALSA SoC Audio Layer utility functions
   4 //
   5 // Copyright 2009 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8 //         Liam Girdwood <lrg@slimlogic.co.uk>
   9
  10 #include <linux/platform_device.h>
  11 #include <linux/export.h>
  12 #include <sound/core.h>
  13 #include <sound/pcm.h>
  14 #include <sound/pcm_params.h>
  15 #include <sound/soc.h>
  16
  17 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  18 {
  19         return sample_size * channels * tdm_slots;
  20 }
  21 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  22
  23 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
  24 {
  25         int sample_size;
  26
  27         sample_size = snd_pcm_format_width(params_format(params));
  28         if (sample_size < 0)
  29                 return sample_size;
  30
  31         return snd_soc_calc_frame_size(sample_size, params_channels(params),
  32                                        1);
  33 }
  34 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  35
  36 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  37 {
  38         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  39 }
  40 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  41
  42 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  43 {
  44         int ret;
  45
  46         ret = snd_soc_params_to_frame_size(params);
  47
  48         if (ret > 0)
  49                 return ret * params_rate(params);
  50         else
  51                 return ret;
  52 }
  53 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
  54
  55 static const struct snd_pcm_hardware dummy_dma_hardware = {
  56         /* Random values to keep userspace happy when checking constraints */
  57         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  58                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
  59         .buffer_bytes_max       = 128*1024,
  60         .period_bytes_min       = PAGE_SIZE,
  61         .period_bytes_max       = PAGE_SIZE*2,
  62         .periods_min            = 2,
  63         .periods_max            = 128,
  64 };
  65
  66 static int dummy_dma_open(struct snd_soc_component *component,
  67                           struct snd_pcm_substream *substream)
  68 {
  69         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
  70
  71         /* BE's dont need dummy params */
  72         if (!rtd->dai_link->no_pcm)
  73                 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
  74
  75         return 0;
  76 }
  77
  78 static const struct snd_soc_component_driver dummy_platform = {
  79         .open           = dummy_dma_open,
  80 };
  81
  82 static const struct snd_soc_component_driver dummy_codec = {
  83         .idle_bias_on           = 1,
  84         .use_pmdown_time        = 1,
  85         .endianness             = 1,
  86         .non_legacy_dai_naming  = 1,
  87 };
  88
  89 #define STUB_RATES      SNDRV_PCM_RATE_8000_384000
  90 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
  91                         SNDRV_PCM_FMTBIT_U8 | \
  92                         SNDRV_PCM_FMTBIT_S16_LE | \
  93                         SNDRV_PCM_FMTBIT_U16_LE | \
  94                         SNDRV_PCM_FMTBIT_S24_LE | \
  95                         SNDRV_PCM_FMTBIT_S24_3LE | \
  96                         SNDRV_PCM_FMTBIT_U24_LE | \
  97                         SNDRV_PCM_FMTBIT_S32_LE | \
  98                         SNDRV_PCM_FMTBIT_U32_LE | \
  99                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 100
 101 /*
 102  * Select these from Sound Card Manually
 103  *      SND_SOC_POSSIBLE_DAIFMT_CBP_CFP
 104  *      SND_SOC_POSSIBLE_DAIFMT_CBP_CFC
 105  *      SND_SOC_POSSIBLE_DAIFMT_CBC_CFP
 106  *      SND_SOC_POSSIBLE_DAIFMT_CBC_CFC
 107  */
 108 static u64 dummy_dai_formats =
 109         SND_SOC_POSSIBLE_DAIFMT_I2S     |
 110         SND_SOC_POSSIBLE_DAIFMT_RIGHT_J |
 111         SND_SOC_POSSIBLE_DAIFMT_LEFT_J  |
 112         SND_SOC_POSSIBLE_DAIFMT_DSP_A   |
 113         SND_SOC_POSSIBLE_DAIFMT_DSP_B   |
 114         SND_SOC_POSSIBLE_DAIFMT_AC97    |
 115         SND_SOC_POSSIBLE_DAIFMT_PDM     |
 116         SND_SOC_POSSIBLE_DAIFMT_GATED   |
 117         SND_SOC_POSSIBLE_DAIFMT_CONT    |
 118         SND_SOC_POSSIBLE_DAIFMT_NB_NF   |
 119         SND_SOC_POSSIBLE_DAIFMT_NB_IF   |
 120         SND_SOC_POSSIBLE_DAIFMT_IB_NF   |
 121         SND_SOC_POSSIBLE_DAIFMT_IB_IF;
 122
 123 static const struct snd_soc_dai_ops dummy_dai_ops = {
 124         .auto_selectable_formats        = &dummy_dai_formats,
 125         .num_auto_selectable_formats    = 1,
 126 };
 127
 128 /*
 129  * The dummy CODEC is only meant to be used in situations where there is no
 130  * actual hardware.
 131  *
 132  * If there is actual hardware even if it does not have a control bus
 133  * the hardware will still have constraints like supported samplerates, etc.
 134  * which should be modelled. And the data flow graph also should be modelled
 135  * using DAPM.
 136  */
 137 static struct snd_soc_dai_driver dummy_dai = {
 138         .name = "snd-soc-dummy-dai",
 139         .playback = {
 140                 .stream_name    = "Playback",
 141                 .channels_min   = 1,
 142                 .channels_max   = 384,
 143                 .rates          = STUB_RATES,
 144                 .formats        = STUB_FORMATS,
 145         },
 146         .capture = {
 147                 .stream_name    = "Capture",
 148                 .channels_min   = 1,
 149                 .channels_max   = 384,
 150                 .rates = STUB_RATES,
 151                 .formats = STUB_FORMATS,
 152          },
 153         .ops = &dummy_dai_ops,
 154 };
 155
 156 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
 157 {
 158         if (dai->driver == &dummy_dai)
 159                 return 1;
 160         return 0;
 161 }
 162
 163 int snd_soc_component_is_dummy(struct snd_soc_component *component)
 164 {
 165         return ((component->driver == &dummy_platform) ||
 166                 (component->driver == &dummy_codec));
 167 }
 168
 169 static int snd_soc_dummy_probe(struct platform_device *pdev)
 170 {
 171         int ret;
 172
 173         ret = devm_snd_soc_register_component(&pdev->dev,
 174                                               &dummy_codec, &dummy_dai, 1);
 175         if (ret < 0)
 176                 return ret;
 177
 178         ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
 179                                               NULL, 0);
 180
 181         return ret;
 182 }
 183
 184 static struct platform_driver soc_dummy_driver = {
 185         .driver = {
 186                 .name = "snd-soc-dummy",
 187         },
 188         .probe = snd_soc_dummy_probe,
 189 };
 190
 191 static struct platform_device *soc_dummy_dev;
 192
 193 int __init snd_soc_util_init(void)
 194 {
 195         int ret;
 196
 197         soc_dummy_dev =
 198                 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
 199         if (IS_ERR(soc_dummy_dev))
 200                 return PTR_ERR(soc_dummy_dev);
 201
 202         ret = platform_driver_register(&soc_dummy_driver);
 203         if (ret != 0)
 204                 platform_device_unregister(soc_dummy_dev);
 205
 206         return ret;
 207 }
 208
 209 void __exit snd_soc_util_exit(void)
 210 {
 211         platform_driver_unregister(&soc_dummy_driver);
 212         platform_device_unregister(soc_dummy_dev);
 213 }