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 int snd_soc_component_enable_pin(struct snd_soc_component *component,
  62                                  const char *pin)
  63 {
  64         struct snd_soc_dapm_context *dapm =
  65                 snd_soc_component_get_dapm(component);
  66         char *full_name;
  67         int ret;
  68
  69         if (!component->name_prefix)
  70                 return snd_soc_dapm_enable_pin(dapm, pin);
  71
  72         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
  73         if (!full_name)
  74                 return -ENOMEM;
  75
  76         ret = snd_soc_dapm_enable_pin(dapm, full_name);
  77         kfree(full_name);
  78
  79         return ret;
  80 }
  81 EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin);
  82
  83 int snd_soc_component_enable_pin_unlocked(struct snd_soc_component *component,
  84                                           const char *pin)
  85 {
  86         struct snd_soc_dapm_context *dapm =
  87                 snd_soc_component_get_dapm(component);
  88         char *full_name;
  89         int ret;
  90
  91         if (!component->name_prefix)
  92                 return snd_soc_dapm_enable_pin_unlocked(dapm, pin);
  93
  94         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
  95         if (!full_name)
  96                 return -ENOMEM;
  97
  98         ret = snd_soc_dapm_enable_pin_unlocked(dapm, full_name);
  99         kfree(full_name);
 100
 101         return ret;
 102 }
 103 EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin_unlocked);
 104
 105 int snd_soc_component_disable_pin(struct snd_soc_component *component,
 106                                   const char *pin)
 107 {
 108         struct snd_soc_dapm_context *dapm =
 109                 snd_soc_component_get_dapm(component);
 110         char *full_name;
 111         int ret;
 112
 113         if (!component->name_prefix)
 114                 return snd_soc_dapm_disable_pin(dapm, pin);
 115
 116         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 117         if (!full_name)
 118                 return -ENOMEM;
 119
 120         ret = snd_soc_dapm_disable_pin(dapm, full_name);
 121         kfree(full_name);
 122
 123         return ret;
 124 }
 125 EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin);
 126
 127 int snd_soc_component_disable_pin_unlocked(struct snd_soc_component *component,
 128                                            const char *pin)
 129 {
 130         struct snd_soc_dapm_context *dapm =
 131                 snd_soc_component_get_dapm(component);
 132         char *full_name;
 133         int ret;
 134
 135         if (!component->name_prefix)
 136                 return snd_soc_dapm_disable_pin_unlocked(dapm, pin);
 137
 138         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 139         if (!full_name)
 140                 return -ENOMEM;
 141
 142         ret = snd_soc_dapm_disable_pin_unlocked(dapm, full_name);
 143         kfree(full_name);
 144
 145         return ret;
 146 }
 147 EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin_unlocked);
 148
 149 int snd_soc_component_nc_pin(struct snd_soc_component *component,
 150                              const char *pin)
 151 {
 152         struct snd_soc_dapm_context *dapm =
 153                 snd_soc_component_get_dapm(component);
 154         char *full_name;
 155         int ret;
 156
 157         if (!component->name_prefix)
 158                 return snd_soc_dapm_nc_pin(dapm, pin);
 159
 160         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 161         if (!full_name)
 162                 return -ENOMEM;
 163
 164         ret = snd_soc_dapm_nc_pin(dapm, full_name);
 165         kfree(full_name);
 166
 167         return ret;
 168 }
 169 EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin);
 170
 171 int snd_soc_component_nc_pin_unlocked(struct snd_soc_component *component,
 172                                       const char *pin)
 173 {
 174         struct snd_soc_dapm_context *dapm =
 175                 snd_soc_component_get_dapm(component);
 176         char *full_name;
 177         int ret;
 178
 179         if (!component->name_prefix)
 180                 return snd_soc_dapm_nc_pin_unlocked(dapm, pin);
 181
 182         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 183         if (!full_name)
 184                 return -ENOMEM;
 185
 186         ret = snd_soc_dapm_nc_pin_unlocked(dapm, full_name);
 187         kfree(full_name);
 188
 189         return ret;
 190 }
 191 EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin_unlocked);
 192
 193 int snd_soc_component_get_pin_status(struct snd_soc_component *component,
 194                                      const char *pin)
 195 {
 196         struct snd_soc_dapm_context *dapm =
 197                 snd_soc_component_get_dapm(component);
 198         char *full_name;
 199         int ret;
 200
 201         if (!component->name_prefix)
 202                 return snd_soc_dapm_get_pin_status(dapm, pin);
 203
 204         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 205         if (!full_name)
 206                 return -ENOMEM;
 207
 208         ret = snd_soc_dapm_get_pin_status(dapm, full_name);
 209         kfree(full_name);
 210
 211         return ret;
 212 }
 213 EXPORT_SYMBOL_GPL(snd_soc_component_get_pin_status);
 214
 215 int snd_soc_component_force_enable_pin(struct snd_soc_component *component,
 216                                        const char *pin)
 217 {
 218         struct snd_soc_dapm_context *dapm =
 219                 snd_soc_component_get_dapm(component);
 220         char *full_name;
 221         int ret;
 222
 223         if (!component->name_prefix)
 224                 return snd_soc_dapm_force_enable_pin(dapm, pin);
 225
 226         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 227         if (!full_name)
 228                 return -ENOMEM;
 229
 230         ret = snd_soc_dapm_force_enable_pin(dapm, full_name);
 231         kfree(full_name);
 232
 233         return ret;
 234 }
 235 EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin);
 236
 237 int snd_soc_component_force_enable_pin_unlocked(
 238                                         struct snd_soc_component *component,
 239                                         const char *pin)
 240 {
 241         struct snd_soc_dapm_context *dapm =
 242                 snd_soc_component_get_dapm(component);
 243         char *full_name;
 244         int ret;
 245
 246         if (!component->name_prefix)
 247                 return snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
 248
 249         full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
 250         if (!full_name)
 251                 return -ENOMEM;
 252
 253         ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, full_name);
 254         kfree(full_name);
 255
 256         return ret;
 257 }
 258 EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin_unlocked);
 259
 260 static const struct snd_pcm_hardware dummy_dma_hardware = {
 261         /* Random values to keep userspace happy when checking constraints */
 262         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
 263                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
 264         .buffer_bytes_max       = 128*1024,
 265         .period_bytes_min       = PAGE_SIZE,
 266         .period_bytes_max       = PAGE_SIZE*2,
 267         .periods_min            = 2,
 268         .periods_max            = 128,
 269 };
 270
 271 static int dummy_dma_open(struct snd_pcm_substream *substream)
 272 {
 273         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 274
 275         /* BE's dont need dummy params */
 276         if (!rtd->dai_link->no_pcm)
 277                 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
 278
 279         return 0;
 280 }
 281
 282 static const struct snd_pcm_ops dummy_dma_ops = {
 283         .open           = dummy_dma_open,
 284         .ioctl          = snd_pcm_lib_ioctl,
 285 };
 286
 287 static const struct snd_soc_component_driver dummy_platform = {
 288         .ops = &dummy_dma_ops,
 289 };
 290
 291 static const struct snd_soc_component_driver dummy_codec = {
 292         .idle_bias_on           = 1,
 293         .use_pmdown_time        = 1,
 294         .endianness             = 1,
 295         .non_legacy_dai_naming  = 1,
 296 };
 297
 298 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
 299 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
 300                         SNDRV_PCM_FMTBIT_U8 | \
 301                         SNDRV_PCM_FMTBIT_S16_LE | \
 302                         SNDRV_PCM_FMTBIT_U16_LE | \
 303                         SNDRV_PCM_FMTBIT_S24_LE | \
 304                         SNDRV_PCM_FMTBIT_U24_LE | \
 305                         SNDRV_PCM_FMTBIT_S32_LE | \
 306                         SNDRV_PCM_FMTBIT_U32_LE | \
 307                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 308 /*
 309  * The dummy CODEC is only meant to be used in situations where there is no
 310  * actual hardware.
 311  *
 312  * If there is actual hardware even if it does not have a control bus
 313  * the hardware will still have constraints like supported samplerates, etc.
 314  * which should be modelled. And the data flow graph also should be modelled
 315  * using DAPM.
 316  */
 317 static struct snd_soc_dai_driver dummy_dai = {
 318         .name = "snd-soc-dummy-dai",
 319         .playback = {
 320                 .stream_name    = "Playback",
 321                 .channels_min   = 1,
 322                 .channels_max   = 384,
 323                 .rates          = STUB_RATES,
 324                 .formats        = STUB_FORMATS,
 325         },
 326         .capture = {
 327                 .stream_name    = "Capture",
 328                 .channels_min   = 1,
 329                 .channels_max   = 384,
 330                 .rates = STUB_RATES,
 331                 .formats = STUB_FORMATS,
 332          },
 333 };
 334
 335 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
 336 {
 337         if (dai->driver == &dummy_dai)
 338                 return 1;
 339         return 0;
 340 }
 341
 342 static int snd_soc_dummy_probe(struct platform_device *pdev)
 343 {
 344         int ret;
 345
 346         ret = devm_snd_soc_register_component(&pdev->dev,
 347                                               &dummy_codec, &dummy_dai, 1);
 348         if (ret < 0)
 349                 return ret;
 350
 351         ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
 352                                               NULL, 0);
 353
 354         return ret;
 355 }
 356
 357 static struct platform_driver soc_dummy_driver = {
 358         .driver = {
 359                 .name = "snd-soc-dummy",
 360         },
 361         .probe = snd_soc_dummy_probe,
 362 };
 363
 364 static struct platform_device *soc_dummy_dev;
 365
 366 int __init snd_soc_util_init(void)
 367 {
 368         int ret;
 369
 370         soc_dummy_dev =
 371                 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
 372         if (IS_ERR(soc_dummy_dev))
 373                 return PTR_ERR(soc_dummy_dev);
 374
 375         ret = platform_driver_register(&soc_dummy_driver);
 376         if (ret != 0)
 377                 platform_device_unregister(soc_dummy_dev);
 378
 379         return ret;
 380 }
 381
 382 void __exit snd_soc_util_exit(void)
 383 {
 384         platform_device_unregister(soc_dummy_dev);
 385         platform_driver_unregister(&soc_dummy_driver);
 386 }