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 <linux/math.h>
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc.h>
  17
  18 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
  19 {
  20         return sample_size * channels * tdm_slots;
  21 }
  22 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
  23
  24 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
  25 {
  26         int sample_size;
  27
  28         sample_size = snd_pcm_format_width(params_format(params));
  29         if (sample_size < 0)
  30                 return sample_size;
  31
  32         return snd_soc_calc_frame_size(sample_size, params_channels(params),
  33                                        1);
  34 }
  35 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
  36
  37 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
  38 {
  39         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
  40 }
  41 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
  42
  43 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
  44 {
  45         int ret;
  46
  47         ret = snd_soc_params_to_frame_size(params);
  48
  49         if (ret > 0)
  50                 return ret * params_rate(params);
  51         else
  52                 return ret;
  53 }
  54 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
  55
  56 /**
  57  * snd_soc_tdm_params_to_bclk - calculate bclk from params and tdm slot info.
  58  *
  59  * Calculate the bclk from the params sample rate, the tdm slot count and the
  60  * tdm slot width. Optionally round-up the slot count to a given multiple.
  61  * Either or both of tdm_width and tdm_slots can be 0.
  62  *
  63  * If tdm_width == 0:   use params_width() as the slot width.
  64  * If tdm_slots == 0:   use params_channels() as the slot count.
  65  *
  66  * If slot_multiple > 1 the slot count (or params_channels() if tdm_slots == 0)
  67  * will be rounded up to a multiple of slot_multiple. This is mainly useful for
  68  * I2S mode, which has a left and right phase so the number of slots is always
  69  * a multiple of 2.
  70  *
  71  * If tdm_width == 0 && tdm_slots == 0 && slot_multiple < 2, this is equivalent
  72  * to calling snd_soc_params_to_bclk().
  73  *
  74  * @params:        Pointer to struct_pcm_hw_params.
  75  * @tdm_width:     Width in bits of the tdm slots. Must be >= 0.
  76  * @tdm_slots:     Number of tdm slots per frame. Must be >= 0.
  77  * @slot_multiple: If >1 roundup slot count to a multiple of this value.
  78  *
  79  * Return: bclk frequency in Hz, else a negative error code if params format
  80  *         is invalid.
  81  */
  82 int snd_soc_tdm_params_to_bclk(struct snd_pcm_hw_params *params,
  83                                int tdm_width, int tdm_slots, int slot_multiple)
  84 {
  85         if (!tdm_slots)
  86                 tdm_slots = params_channels(params);
  87
  88         if (slot_multiple > 1)
  89                 tdm_slots = roundup(tdm_slots, slot_multiple);
  90
  91         if (!tdm_width) {
  92                 tdm_width = snd_pcm_format_width(params_format(params));
  93                 if (tdm_width < 0)
  94                         return tdm_width;
  95         }
  96
  97         return snd_soc_calc_bclk(params_rate(params), tdm_width, 1, tdm_slots);
  98 }
  99 EXPORT_SYMBOL_GPL(snd_soc_tdm_params_to_bclk);
 100
 101 static const struct snd_pcm_hardware dummy_dma_hardware = {
 102         /* Random values to keep userspace happy when checking constraints */
 103         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
 104                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
 105         .buffer_bytes_max       = 128*1024,
 106         .period_bytes_min       = PAGE_SIZE,
 107         .period_bytes_max       = PAGE_SIZE*2,
 108         .periods_min            = 2,
 109         .periods_max            = 128,
 110 };
 111
 112
 113 static const struct snd_soc_component_driver dummy_platform;
 114
 115 static int dummy_dma_open(struct snd_soc_component *component,
 116                           struct snd_pcm_substream *substream)
 117 {
 118         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 119         int i;
 120
 121         /*
 122          * If there are other components associated with rtd, we shouldn't
 123          * override their hwparams
 124          */
 125         for_each_rtd_components(rtd, i, component) {
 126                 if (component->driver == &dummy_platform)
 127                         return 0;
 128         }
 129
 130         /* BE's dont need dummy params */
 131         if (!rtd->dai_link->no_pcm)
 132                 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
 133
 134         return 0;
 135 }
 136
 137 static const struct snd_soc_component_driver dummy_platform = {
 138         .open           = dummy_dma_open,
 139 };
 140
 141 static const struct snd_soc_component_driver dummy_codec = {
 142         .idle_bias_on           = 1,
 143         .use_pmdown_time        = 1,
 144         .endianness             = 1,
 145 };
 146
 147 #define STUB_RATES      SNDRV_PCM_RATE_8000_384000
 148 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
 149                         SNDRV_PCM_FMTBIT_U8 | \
 150                         SNDRV_PCM_FMTBIT_S16_LE | \
 151                         SNDRV_PCM_FMTBIT_U16_LE | \
 152                         SNDRV_PCM_FMTBIT_S24_LE | \
 153                         SNDRV_PCM_FMTBIT_S24_3LE | \
 154                         SNDRV_PCM_FMTBIT_U24_LE | \
 155                         SNDRV_PCM_FMTBIT_S32_LE | \
 156                         SNDRV_PCM_FMTBIT_U32_LE | \
 157                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 158
 159 /*
 160  * Select these from Sound Card Manually
 161  *      SND_SOC_POSSIBLE_DAIFMT_CBP_CFP
 162  *      SND_SOC_POSSIBLE_DAIFMT_CBP_CFC
 163  *      SND_SOC_POSSIBLE_DAIFMT_CBC_CFP
 164  *      SND_SOC_POSSIBLE_DAIFMT_CBC_CFC
 165  */
 166 static u64 dummy_dai_formats =
 167         SND_SOC_POSSIBLE_DAIFMT_I2S     |
 168         SND_SOC_POSSIBLE_DAIFMT_RIGHT_J |
 169         SND_SOC_POSSIBLE_DAIFMT_LEFT_J  |
 170         SND_SOC_POSSIBLE_DAIFMT_DSP_A   |
 171         SND_SOC_POSSIBLE_DAIFMT_DSP_B   |
 172         SND_SOC_POSSIBLE_DAIFMT_AC97    |
 173         SND_SOC_POSSIBLE_DAIFMT_PDM     |
 174         SND_SOC_POSSIBLE_DAIFMT_GATED   |
 175         SND_SOC_POSSIBLE_DAIFMT_CONT    |
 176         SND_SOC_POSSIBLE_DAIFMT_NB_NF   |
 177         SND_SOC_POSSIBLE_DAIFMT_NB_IF   |
 178         SND_SOC_POSSIBLE_DAIFMT_IB_NF   |
 179         SND_SOC_POSSIBLE_DAIFMT_IB_IF;
 180
 181 static const struct snd_soc_dai_ops dummy_dai_ops = {
 182         .auto_selectable_formats        = &dummy_dai_formats,
 183         .num_auto_selectable_formats    = 1,
 184 };
 185
 186 /*
 187  * The dummy CODEC is only meant to be used in situations where there is no
 188  * actual hardware.
 189  *
 190  * If there is actual hardware even if it does not have a control bus
 191  * the hardware will still have constraints like supported samplerates, etc.
 192  * which should be modelled. And the data flow graph also should be modelled
 193  * using DAPM.
 194  */
 195 static struct snd_soc_dai_driver dummy_dai = {
 196         .name = "snd-soc-dummy-dai",
 197         .playback = {
 198                 .stream_name    = "Playback",
 199                 .channels_min   = 1,
 200                 .channels_max   = 384,
 201                 .rates          = STUB_RATES,
 202                 .formats        = STUB_FORMATS,
 203         },
 204         .capture = {
 205                 .stream_name    = "Capture",
 206                 .channels_min   = 1,
 207                 .channels_max   = 384,
 208                 .rates = STUB_RATES,
 209                 .formats = STUB_FORMATS,
 210          },
 211         .ops = &dummy_dai_ops,
 212 };
 213
 214 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
 215 {
 216         if (dai->driver == &dummy_dai)
 217                 return 1;
 218         return 0;
 219 }
 220
 221 int snd_soc_component_is_dummy(struct snd_soc_component *component)
 222 {
 223         return ((component->driver == &dummy_platform) ||
 224                 (component->driver == &dummy_codec));
 225 }
 226
 227 struct snd_soc_dai_link_component asoc_dummy_dlc = {
 228         .of_node        = NULL,
 229         .dai_name       = "snd-soc-dummy-dai",
 230         .name           = "snd-soc-dummy",
 231 };
 232 EXPORT_SYMBOL_GPL(asoc_dummy_dlc);
 233
 234 static int snd_soc_dummy_probe(struct platform_device *pdev)
 235 {
 236         int ret;
 237
 238         ret = devm_snd_soc_register_component(&pdev->dev,
 239                                               &dummy_codec, &dummy_dai, 1);
 240         if (ret < 0)
 241                 return ret;
 242
 243         ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
 244                                               NULL, 0);
 245
 246         return ret;
 247 }
 248
 249 static struct platform_driver soc_dummy_driver = {
 250         .driver = {
 251                 .name = "snd-soc-dummy",
 252         },
 253         .probe = snd_soc_dummy_probe,
 254 };
 255
 256 static struct platform_device *soc_dummy_dev;
 257
 258 int __init snd_soc_util_init(void)
 259 {
 260         int ret;
 261
 262         soc_dummy_dev =
 263                 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
 264         if (IS_ERR(soc_dummy_dev))
 265                 return PTR_ERR(soc_dummy_dev);
 266
 267         ret = platform_driver_register(&soc_dummy_driver);
 268         if (ret != 0)
 269                 platform_device_unregister(soc_dummy_dev);
 270
 271         return ret;
 272 }
 273
 274 void snd_soc_util_exit(void)
 275 {
 276         platform_driver_unregister(&soc_dummy_driver);
 277         platform_device_unregister(soc_dummy_dev);
 278 }