root/sound/soc/cirrus/edb93xx.c

DEFINITIONS

1. edb93xx_hw_params
2. edb93xx_probe
3. edb93xx_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * SoC audio for EDB93xx
   4  *
   5  * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
   6  *
   7  * This driver support CS4271 codec being master or slave, working
   8  * in control port mode, connected either via SPI or I2C.
   9  * The data format accepted is I2S or left-justified.
  10  * DAPM support not implemented.
  11  */
  12 
  13 #include <linux/platform_device.h>
  14 #include <linux/gpio.h>
  15 #include <linux/module.h>
  16 #include <linux/soc/cirrus/ep93xx.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/soc.h>
  20 #include <asm/mach-types.h>
  21 
  22 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
  23                              struct snd_pcm_hw_params *params)
  24 {
  25         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  26         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  27         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  28         int err;
  29         unsigned int mclk_rate;
  30         unsigned int rate = params_rate(params);
  31 
  32         /*
  33          * According to CS4271 datasheet we use MCLK/LRCK=256 for
  34          * rates below 50kHz and 128 for higher sample rates
  35          */
  36         if (rate < 50000)
  37                 mclk_rate = rate * 64 * 4;
  38         else
  39                 mclk_rate = rate * 64 * 2;
  40 
  41         err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
  42                                      SND_SOC_CLOCK_IN);
  43         if (err)
  44                 return err;
  45 
  46         return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
  47                                       SND_SOC_CLOCK_OUT);
  48 }
  49 
  50 static const struct snd_soc_ops edb93xx_ops = {
  51         .hw_params      = edb93xx_hw_params,
  52 };
  53 
  54 SND_SOC_DAILINK_DEFS(hifi,
  55         DAILINK_COMP_ARRAY(COMP_CPU("ep93xx-i2s")),
  56         DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "cs4271-hifi")),
  57         DAILINK_COMP_ARRAY(COMP_PLATFORM("ep93xx-i2s")));
  58 
  59 static struct snd_soc_dai_link edb93xx_dai = {
  60         .name           = "CS4271",
  61         .stream_name    = "CS4271 HiFi",
  62         .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  63                           SND_SOC_DAIFMT_CBS_CFS,
  64         .ops            = &edb93xx_ops,
  65         SND_SOC_DAILINK_REG(hifi),
  66 };
  67 
  68 static struct snd_soc_card snd_soc_edb93xx = {
  69         .name           = "EDB93XX",
  70         .owner          = THIS_MODULE,
  71         .dai_link       = &edb93xx_dai,
  72         .num_links      = 1,
  73 };
  74 
  75 static int edb93xx_probe(struct platform_device *pdev)
  76 {
  77         struct snd_soc_card *card = &snd_soc_edb93xx;
  78         int ret;
  79 
  80         ret = ep93xx_i2s_acquire();
  81         if (ret)
  82                 return ret;
  83 
  84         card->dev = &pdev->dev;
  85 
  86         ret = snd_soc_register_card(card);
  87         if (ret) {
  88                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  89                         ret);
  90                 ep93xx_i2s_release();
  91         }
  92 
  93         return ret;
  94 }
  95 
  96 static int edb93xx_remove(struct platform_device *pdev)
  97 {
  98         struct snd_soc_card *card = platform_get_drvdata(pdev);
  99 
 100         snd_soc_unregister_card(card);
 101         ep93xx_i2s_release();
 102 
 103         return 0;
 104 }
 105 
 106 static struct platform_driver edb93xx_driver = {
 107         .driver         = {
 108                 .name   = "edb93xx-audio",
 109         },
 110         .probe          = edb93xx_probe,
 111         .remove         = edb93xx_remove,
 112 };
 113 
 114 module_platform_driver(edb93xx_driver);
 115 
 116 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 117 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 118 MODULE_LICENSE("GPL");
 119 MODULE_ALIAS("platform:edb93xx-audio");