sound/soc/starfive/starfive_pwmdac_transmitter.c

   1 /**
   2   ******************************************************************************
   3   * @file  sf_pwmdac_transmitter.c
   4   * @author  StarFive Technology
   5   * @version  V1.0
   6   * @date  05/27/2021
   7   * @brief
   8   ******************************************************************************
   9   * @copy
  10   *
  11   * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  12   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  13   * TIME. AS A RESULT, STARFIVE SHALL NOT BE HELD LIABLE FOR ANY
  14   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  15   * FROM THE CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  16   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  17   *
  18   * <h2><center>&copy; COPYRIGHT 20120 Shanghai StarFive Technology Co., Ltd. </center></h2>
  19   */
  20
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/slab.h>
  24 #include <sound/soc.h>
  25 #include <sound/pcm.h>
  26 #include <sound/initval.h>
  27 #include <linux/of.h>
  28
  29 #define DRV_NAME "pwmdac-dit"
  30
  31 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  32 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8|\
  33                         SNDRV_PCM_FMTBIT_U8|\
  34                         SNDRV_PCM_FMTBIT_S16_LE | \
  35                         SNDRV_PCM_FMTBIT_S20_3LE | \
  36                         SNDRV_PCM_FMTBIT_S24_LE  | \
  37                         SNDRV_PCM_FMTBIT_S32_LE)
  38
  39 static const struct snd_soc_dapm_widget dit_widgets[] = {
  40         SND_SOC_DAPM_OUTPUT("pwmdac-out"),
  41 };
  42
  43 static const struct snd_soc_dapm_route dit_routes[] = {
  44         { "pwmdac-out", NULL, "Playback" },
  45 };
  46
  47 static struct snd_soc_component_driver soc_codec_pwmdac_dit = {
  48         .dapm_widgets           = dit_widgets,
  49         .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
  50         .dapm_routes            = dit_routes,
  51         .num_dapm_routes        = ARRAY_SIZE(dit_routes),
  52         .idle_bias_on           = 1,
  53         .use_pmdown_time        = 1,
  54         .endianness             = 1,
  55         .non_legacy_dai_naming  = 1,
  56 };
  57
  58 static struct snd_soc_dai_driver dit_stub_dai = {
  59         .name           = "pwmdac-dit-hifi",
  60         .playback       = {
  61                 .stream_name    = "Playback",
  62                 .channels_min   = 1,
  63                 .channels_max   = 384,
  64                 .rates          = STUB_RATES,
  65                 .formats        = STUB_FORMATS,
  66         },
  67 };
  68
  69 static int pwmdac_dit_probe(struct platform_device *pdev)
  70 {
  71
  72         return devm_snd_soc_register_component(&pdev->dev,
  73                         &soc_codec_pwmdac_dit,
  74                         &dit_stub_dai, 1);
  75 }
  76
  77 #ifdef CONFIG_OF
  78 static const struct of_device_id pwmdac_dit_dt_ids[] = {
  79         { .compatible = "starfive,jh7110-pwmdac-dit", },
  80         { }
  81 };
  82 MODULE_DEVICE_TABLE(of, pwmdac_dit_dt_ids);
  83 #endif
  84
  85 static struct platform_driver pwmdac_dit_driver = {
  86         .probe          = pwmdac_dit_probe,
  87         .driver         = {
  88                 .name   = DRV_NAME,
  89                 .of_match_table = of_match_ptr(pwmdac_dit_dt_ids),
  90         },
  91 };
  92
  93 static int __init pwmdac_dit_driver_init(void)
  94 {
  95         return platform_driver_register(&pwmdac_dit_driver);
  96 }
  97
  98 static void pwmdac_dit_driver_exit(void)
  99 {
 100         platform_driver_unregister(&pwmdac_dit_driver);
 101 }
 102
 103 late_initcall(pwmdac_dit_driver_init);
 104 module_exit(pwmdac_dit_driver_exit);
 105
 106
 107 MODULE_AUTHOR("curry.zhang <curry.zhang@starfivetech.com>");
 108 MODULE_DESCRIPTION("pwmdac dummy codec driver");
 109 MODULE_LICENSE("GPL v2");
 110 MODULE_ALIAS("platform: starfive-pwmdac dummy codec");