sound/soc/bcm/adau1977-adc.c

   1 /*
   2  * ASoC Driver for ADAU1977 ADC
   3  *
   4  * Author:      Andrey Grodzovsky <andrey2805@gmail.com>
   5  *              Copyright 2016
   6  *
   7  * This file is based on hifibery_dac driver by Florian Meier.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/jack.h>
  27
  28 enum adau1977_clk_id {
  29     ADAU1977_SYSCLK,
  30 };
  31
  32 enum adau1977_sysclk_src {
  33     ADAU1977_SYSCLK_SRC_MCLK,
  34     ADAU1977_SYSCLK_SRC_LRCLK,
  35 };
  36
  37 static int eval_adau1977_init(struct snd_soc_pcm_runtime *rtd)
  38 {
  39         int ret;
  40         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  41
  42         ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, 0, 0, 0);
  43         if (ret < 0)
  44                 return ret;
  45
  46         return snd_soc_codec_set_sysclk(rtd->codec, ADAU1977_SYSCLK,
  47                         ADAU1977_SYSCLK_SRC_MCLK, 11289600, SND_SOC_CLOCK_IN);
  48 }
  49
  50 static struct snd_soc_dai_link snd_rpi_adau1977_dai[] = {
  51         {
  52         .name = "adau1977",
  53         .stream_name = "ADAU1977",
  54         .cpu_dai_name = "bcm2708-i2s.0",
  55         .codec_dai_name = "adau1977-hifi",
  56         .platform_name = "bcm2708-i2s.0",
  57         .codec_name = "adau1977.1-0011",
  58         .init = eval_adau1977_init,
  59         .dai_fmt = SND_SOC_DAIFMT_I2S |
  60                 SND_SOC_DAIFMT_NB_NF |
  61                 SND_SOC_DAIFMT_CBM_CFM,
  62         },
  63 };
  64
  65 /* audio machine driver */
  66 static struct snd_soc_card snd_adau1977_adc = {
  67         .name         = "snd_rpi_adau1977_adc",
  68         .owner        = THIS_MODULE,
  69         .dai_link     = snd_rpi_adau1977_dai,
  70         .num_links    = ARRAY_SIZE(snd_rpi_adau1977_dai),
  71 };
  72
  73 static int snd_adau1977_adc_probe(struct platform_device *pdev)
  74 {
  75         int ret = 0;
  76
  77         snd_adau1977_adc.dev = &pdev->dev;
  78         if (pdev->dev.of_node) {
  79             struct device_node *i2s_node;
  80             struct snd_soc_dai_link *dai = &snd_rpi_adau1977_dai[0];
  81             i2s_node = of_parse_phandle(pdev->dev.of_node,
  82                                         "i2s-controller", 0);
  83
  84             if (i2s_node) {
  85                 dai->cpu_dai_name = NULL;
  86                 dai->cpu_of_node = i2s_node;
  87                 dai->platform_name = NULL;
  88                 dai->platform_of_node = i2s_node;
  89             }
  90         }
  91
  92         ret = snd_soc_register_card(&snd_adau1977_adc);
  93         if (ret)
  94                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
  95
  96         return ret;
  97 }
  98
  99 static int snd_adau1977_adc_remove(struct platform_device *pdev)
 100 {
 101         return snd_soc_unregister_card(&snd_adau1977_adc);
 102 }
 103
 104 static const struct of_device_id snd_adau1977_adc_of_match[] = {
 105         { .compatible = "adi,adau1977-adc", },
 106         {},
 107 };
 108
 109 MODULE_DEVICE_TABLE(of, snd_adau1977_adc_of_match);
 110
 111 static struct platform_driver snd_adau1977_adc_driver = {
 112         .driver = {
 113                 .name   = "snd-adau1977-adc",
 114                 .owner  = THIS_MODULE,
 115                 .of_match_table = snd_adau1977_adc_of_match,
 116         },
 117         .probe          = snd_adau1977_adc_probe,
 118         .remove         = snd_adau1977_adc_remove,
 119 };
 120
 121 module_platform_driver(snd_adau1977_adc_driver);
 122
 123 MODULE_AUTHOR("Andrey Grodzovsky <andrey2805@gmail.com>");
 124 MODULE_DESCRIPTION("ASoC Driver for ADAU1977 ADC");
 125 MODULE_LICENSE("GPL v2");