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_pcm_runtime *rtd;
  39         struct snd_soc_dai *codec_dai;
  40         struct snd_soc_dai *cpu_dai;
  41         int ret;
  42
  43         rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
  44         codec_dai = rtd->codec_dai;
  45         cpu_dai = rtd->cpu_dai;
  46
  47         /* Set the MCLK rate for the codec */
  48         ret = snd_soc_dai_set_sysclk(codec_dai, 0,
  49                                         FIN_PLL_RATE, SND_SOC_CLOCK_IN);
  50         if (ret < 0)
  51                 return ret;
  52
  53         /* Select I2S Bus clock to set RCLK and BCLK */
  54         ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_RCLKSRC_0,
  55                                         0, SND_SOC_CLOCK_IN);
  56         if (ret < 0)
  57                 return ret;
  58
  59         return 0;
  60 }
  61
  62 static struct snd_soc_card snow_snd = {
  63         .name = "Snow-I2S",
  64         .owner = THIS_MODULE,
  65         .dai_link = snow_dai,
  66         .num_links = ARRAY_SIZE(snow_dai),
  67
  68         .late_probe = snow_late_probe,
  69 };
  70
  71 static int snow_probe(struct platform_device *pdev)
  72 {
  73         struct snd_soc_card *card = &snow_snd;
  74         struct device_node *i2s_node, *codec_node;
  75         int i, ret;
  76
  77         i2s_node = of_parse_phandle(pdev->dev.of_node,
  78                                     "samsung,i2s-controller", 0);
  79         if (!i2s_node) {
  80                 dev_err(&pdev->dev,
  81                         "Property 'i2s-controller' missing or invalid\n");
  82                 return -EINVAL;
  83         }
  84
  85         codec_node = of_parse_phandle(pdev->dev.of_node,
  86                                       "samsung,audio-codec", 0);
  87         if (!codec_node) {
  88                 dev_err(&pdev->dev,
  89                         "Property 'audio-codec' missing or invalid\n");
  90                 return -EINVAL;
  91         }
  92
  93         for (i = 0; i < ARRAY_SIZE(snow_dai); i++) {
  94                 snow_dai[i].codec_of_node = codec_node;
  95                 snow_dai[i].cpu_of_node = i2s_node;
  96                 snow_dai[i].platform_of_node = i2s_node;
  97         }
  98
  99         card->dev = &pdev->dev;
 100
 101         /* Update card-name if provided through DT, else use default name */
 102         snd_soc_of_parse_card_name(card, "samsung,model");
 103
 104         ret = devm_snd_soc_register_card(&pdev->dev, card);
 105         if (ret) {
 106                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
 107                 return ret;
 108         }
 109
 110         return ret;
 111 }
 112
 113 static const struct of_device_id snow_of_match[] = {
 114         { .compatible = "google,snow-audio-max98090", },
 115         { .compatible = "google,snow-audio-max98091", },
 116         { .compatible = "google,snow-audio-max98095", },
 117         {},
 118 };
 119 MODULE_DEVICE_TABLE(of, snow_of_match);
 120
 121 static struct platform_driver snow_driver = {
 122         .driver = {
 123                 .name = "snow-audio",
 124                 .pm = &snd_soc_pm_ops,
 125                 .of_match_table = snow_of_match,
 126         },
 127         .probe = snow_probe,
 128 };
 129
 130 module_platform_driver(snow_driver);
 131
 132 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
 133 MODULE_LICENSE("GPL");