LXR linux/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
  25static 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
  36static 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
  62static 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
  71static 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
 113static 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};
 119MODULE_DEVICE_TABLE(of, snow_of_match);
 120
 121static 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
 130module_platform_driver(snow_driver);
 131
 132MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
 133MODULE_LICENSE("GPL");
 134