sound/soc/samsung/odroid.c

   1 /*
   2  * Copyright (C) 2017 Samsung Electronics Co., Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/module.h>
  13 #include <sound/soc.h>
  14 #include <sound/pcm_params.h>
  15 #include "i2s.h"
  16 #include "i2s-regs.h"
  17
  18 struct odroid_priv {
  19         struct snd_soc_card card;
  20         struct snd_soc_dai_link dai_link;
  21
  22         struct clk *clk_i2s_bus;
  23         struct clk *sclk_i2s;
  24 };
  25
  26 static int odroid_card_startup(struct snd_pcm_substream *substream)
  27 {
  28         struct snd_pcm_runtime *runtime = substream->runtime;
  29
  30         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
  31         return 0;
  32 }
  33
  34 static int odroid_card_hw_params(struct snd_pcm_substream *substream,
  35                                       struct snd_pcm_hw_params *params)
  36 {
  37         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  38         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  39         unsigned int pll_freq, rclk_freq, rfs;
  40         int ret;
  41
  42         switch (params_rate(params)) {
  43         case 64000:
  44                 pll_freq = 196608001U;
  45                 rfs = 384;
  46                 break;
  47         case 44100:
  48         case 88200:
  49                 pll_freq = 180633609U;
  50                 rfs = 512;
  51                 break;
  52         case 32000:
  53         case 48000:
  54         case 96000:
  55                 pll_freq = 196608001U;
  56                 rfs = 512;
  57                 break;
  58         default:
  59                 return -EINVAL;
  60         }
  61
  62         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  63         if (ret < 0)
  64                 return ret;
  65
  66         /*
  67          *  We add 2 to the rclk_freq value in order to avoid too low clock
  68          *  frequency values due to the EPLL output frequency not being exact
  69          *  multiple of the audio sampling rate.
  70          */
  71         rclk_freq = params_rate(params) * rfs + 2;
  72
  73         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  74         if (ret < 0)
  75                 return ret;
  76
  77         if (rtd->num_codecs > 1) {
  78                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
  79
  80                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
  81                                              SND_SOC_CLOCK_IN);
  82                 if (ret < 0)
  83                         return ret;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static const struct snd_soc_ops odroid_card_ops = {
  90         .startup = odroid_card_startup,
  91         .hw_params = odroid_card_hw_params,
  92 };
  93
  94 static int odroid_audio_probe(struct platform_device *pdev)
  95 {
  96         struct device *dev = &pdev->dev;
  97         struct device_node *cpu, *codec;
  98         struct odroid_priv *priv;
  99         struct snd_soc_dai_link *link;
 100         struct snd_soc_card *card;
 101         int ret;
 102
 103         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 104         if (!priv)
 105                 return -ENOMEM;
 106
 107         card = &priv->card;
 108         card->dev = dev;
 109
 110         card->owner = THIS_MODULE;
 111         card->fully_routed = true;
 112
 113         snd_soc_card_set_drvdata(card, priv);
 114
 115         ret = snd_soc_of_parse_card_name(card, "model");
 116         if (ret < 0)
 117                 return ret;
 118
 119         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 120                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 121                                                 "samsung,audio-widgets");
 122                 if (ret < 0)
 123                         return ret;
 124         }
 125
 126         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 127                 ret = snd_soc_of_parse_audio_routing(card,
 128                                                 "samsung,audio-routing");
 129                 if (ret < 0)
 130                         return ret;
 131         }
 132
 133         link = &priv->dai_link;
 134
 135         link->ops = &odroid_card_ops;
 136         link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 137                         SND_SOC_DAIFMT_CBS_CFS;
 138
 139         card->dai_link = &priv->dai_link;
 140         card->num_links = 1;
 141
 142         cpu = of_get_child_by_name(dev->of_node, "cpu");
 143         codec = of_get_child_by_name(dev->of_node, "codec");
 144
 145         link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
 146         if (!link->cpu_of_node) {
 147                 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
 148                 return -EINVAL;
 149         }
 150
 151         ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
 152         if (ret < 0)
 153                 goto err_put_codec_n;
 154
 155         link->platform_of_node = link->cpu_of_node;
 156
 157         link->name = "Primary";
 158         link->stream_name = link->name;
 159
 160
 161         priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
 162         if (IS_ERR(priv->sclk_i2s)) {
 163                 ret = PTR_ERR(priv->sclk_i2s);
 164                 goto err_put_i2s_n;
 165         }
 166
 167         priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
 168         if (IS_ERR(priv->clk_i2s_bus)) {
 169                 ret = PTR_ERR(priv->clk_i2s_bus);
 170                 goto err_put_sclk;
 171         }
 172
 173         ret = devm_snd_soc_register_card(dev, card);
 174         if (ret < 0) {
 175                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 176                 goto err_put_clk_i2s;
 177         }
 178
 179         return 0;
 180
 181 err_put_clk_i2s:
 182         clk_put(priv->clk_i2s_bus);
 183 err_put_sclk:
 184         clk_put(priv->sclk_i2s);
 185 err_put_i2s_n:
 186         of_node_put(link->cpu_of_node);
 187 err_put_codec_n:
 188         snd_soc_of_put_dai_link_codecs(link);
 189         return ret;
 190 }
 191
 192 static int odroid_audio_remove(struct platform_device *pdev)
 193 {
 194         struct odroid_priv *priv = platform_get_drvdata(pdev);
 195
 196         of_node_put(priv->dai_link.cpu_of_node);
 197         snd_soc_of_put_dai_link_codecs(&priv->dai_link);
 198         clk_put(priv->sclk_i2s);
 199         clk_put(priv->clk_i2s_bus);
 200
 201         return 0;
 202 }
 203
 204 static const struct of_device_id odroid_audio_of_match[] = {
 205         { .compatible   = "hardkernel,odroid-xu3-audio" },
 206         { .compatible   = "hardkernel,odroid-xu4-audio" },
 207         { .compatible   = "samsung,odroid-xu3-audio" },
 208         { .compatible   = "samsung,odroid-xu4-audio" },
 209         { },
 210 };
 211 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 212
 213 static struct platform_driver odroid_audio_driver = {
 214         .driver = {
 215                 .name           = "odroid-audio",
 216                 .of_match_table = odroid_audio_of_match,
 217                 .pm             = &snd_soc_pm_ops,
 218         },
 219         .probe  = odroid_audio_probe,
 220         .remove = odroid_audio_remove,
 221 };
 222 module_platform_driver(odroid_audio_driver);
 223
 224 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 225 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 226 MODULE_LICENSE("GPL v2");