sound/soc/samsung/snow.c

   1 /*
   2  * ASoC machine driver for Snow boards
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18
  19 #include <sound/soc.h>
  20
  21 #include "i2s.h"
  22
  23 #define FIN_PLL_RATE            24000000
  24
  25 static struct snd_soc_dai_link snow_dai[] = {
  26         {
  27                 .name = "Primary",
  28                 .stream_name = "Primary",
  29                 .codec_dai_name = "HiFi",
  30                 .dai_fmt = SND_SOC_DAIFMT_I2S |
  31                                 SND_SOC_DAIFMT_NB_NF |
  32                                 SND_SOC_DAIFMT_CBS_CFS,
  33         },
  34 };
  35
  36 static int snow_late_probe(struct snd_soc_card *card)
  37 {
  38         struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
  39         struct snd_soc_dai *cpu_dai = card->rtd[0].cpu_dai;
  40         int ret;
  41
  42         /* Set the MCLK rate for the codec */
  43         ret = snd_soc_dai_set_sysclk(codec_dai, 0,
  44                                         FIN_PLL_RATE, SND_SOC_CLOCK_IN);
  45         if (ret < 0)
  46                 return ret;
  47
  48         /* Select I2S Bus clock to set RCLK and BCLK */
  49         ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_RCLKSRC_0,
  50                                         0, SND_SOC_CLOCK_IN);
  51         if (ret < 0)
  52                 return ret;
  53
  54         return 0;
  55 }
  56
  57 static struct snd_soc_card snow_snd = {
  58         .name = "Snow-I2S",
  59         .owner = THIS_MODULE,
  60         .dai_link = snow_dai,
  61         .num_links = ARRAY_SIZE(snow_dai),
  62
  63         .late_probe = snow_late_probe,
  64 };
  65
  66 static int snow_probe(struct platform_device *pdev)
  67 {
  68         struct snd_soc_card *card = &snow_snd;
  69         struct device_node *i2s_node, *codec_node;
  70         int i, ret;
  71
  72         i2s_node = of_parse_phandle(pdev->dev.of_node,
  73                                     "samsung,i2s-controller", 0);
  74         if (!i2s_node) {
  75                 dev_err(&pdev->dev,
  76                         "Property 'i2s-controller' missing or invalid\n");
  77                 return -EINVAL;
  78         }
  79
  80         codec_node = of_parse_phandle(pdev->dev.of_node,
  81                                       "samsung,audio-codec", 0);
  82         if (!codec_node) {
  83                 dev_err(&pdev->dev,
  84                         "Property 'audio-codec' missing or invalid\n");
  85                 return -EINVAL;
  86         }
  87
  88         for (i = 0; i < ARRAY_SIZE(snow_dai); i++) {
  89                 snow_dai[i].codec_of_node = codec_node;
  90                 snow_dai[i].cpu_of_node = i2s_node;
  91                 snow_dai[i].platform_of_node = i2s_node;
  92         }
  93
  94         card->dev = &pdev->dev;
  95
  96         /* Update card-name if provided through DT, else use default name */
  97         snd_soc_of_parse_card_name(card, "samsung,model");
  98
  99         ret = devm_snd_soc_register_card(&pdev->dev, card);
 100         if (ret) {
 101                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
 102                 return ret;
 103         }
 104
 105         return ret;
 106 }
 107
 108 static const struct of_device_id snow_of_match[] = {
 109         { .compatible = "google,snow-audio-max98090", },
 110         { .compatible = "google,snow-audio-max98091", },
 111         { .compatible = "google,snow-audio-max98095", },
 112         {},
 113 };
 114 MODULE_DEVICE_TABLE(of, snow_of_match);
 115
 116 static struct platform_driver snow_driver = {
 117         .driver = {
 118                 .name = "snow-audio",
 119                 .pm = &snd_soc_pm_ops,
 120                 .of_match_table = snow_of_match,
 121         },
 122         .probe = snow_probe,
 123 };
 124
 125 module_platform_driver(snow_driver);
 126
 127 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
 128 MODULE_LICENSE("GPL");