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 *pll;
  23         struct clk *rclk;
  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;
  40         int ret;
  41
  42         switch (params_rate(params)) {
  43         case 32000:
  44         case 64000:
  45                 pll_freq = 131072006U;
  46                 break;
  47         case 44100:
  48         case 88200:
  49         case 176400:
  50                 pll_freq = 180633609U;
  51                 break;
  52         case 48000:
  53         case 96000:
  54         case 192000:
  55                 pll_freq = 196608001U;
  56                 break;
  57         default:
  58                 return -EINVAL;
  59         }
  60
  61         ret = clk_set_rate(priv->pll, pll_freq + 1);
  62         if (ret < 0)
  63                 return ret;
  64
  65         rclk_freq = params_rate(params) * 256 * 4;
  66
  67         ret = clk_set_rate(priv->rclk, rclk_freq);
  68         if (ret < 0)
  69                 return ret;
  70
  71         if (rtd->num_codecs > 1) {
  72                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
  73
  74                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
  75                                              SND_SOC_CLOCK_IN);
  76                 if (ret < 0)
  77                         return ret;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static const struct snd_soc_ops odroid_card_ops = {
  84         .startup = odroid_card_startup,
  85         .hw_params = odroid_card_hw_params,
  86 };
  87
  88 static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link)
  89 {
  90         struct snd_soc_dai_link_component *component = link->codecs;
  91         int i;
  92
  93         for (i = 0; i < link->num_codecs; i++, component++) {
  94                 if (!component->of_node)
  95                         break;
  96                 of_node_put(component->of_node);
  97         }
  98 }
  99
 100 static int odroid_audio_probe(struct platform_device *pdev)
 101 {
 102         struct device *dev = &pdev->dev;
 103         struct device_node *cpu, *codec;
 104         struct odroid_priv *priv;
 105         struct snd_soc_dai_link *link;
 106         struct snd_soc_card *card;
 107         int ret;
 108
 109         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 110         if (!priv)
 111                 return -ENOMEM;
 112
 113         card = &priv->card;
 114         card->dev = dev;
 115
 116         card->owner = THIS_MODULE;
 117         card->fully_routed = true;
 118
 119         snd_soc_card_set_drvdata(card, priv);
 120
 121         priv->pll = devm_clk_get(dev, "epll");
 122         if (IS_ERR(priv->pll))
 123                 return PTR_ERR(priv->pll);
 124
 125         priv->rclk = devm_clk_get(dev, "i2s_rclk");
 126         if (IS_ERR(priv->rclk))
 127                 return PTR_ERR(priv->rclk);
 128
 129         ret = snd_soc_of_parse_card_name(card, "model");
 130         if (ret < 0)
 131                 return ret;
 132
 133         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 134                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 135                                                 "samsung,audio-widgets");
 136                 if (ret < 0)
 137                         return ret;
 138         }
 139
 140         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 141                 ret = snd_soc_of_parse_audio_routing(card,
 142                                                 "samsung,audio-routing");
 143                 if (ret < 0)
 144                         return ret;
 145         }
 146
 147         link = &priv->dai_link;
 148
 149         link->ops = &odroid_card_ops;
 150         link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 151                         SND_SOC_DAIFMT_CBS_CFS;
 152
 153         card->dai_link = &priv->dai_link;
 154         card->num_links = 1;
 155
 156         cpu = of_get_child_by_name(dev->of_node, "cpu");
 157         codec = of_get_child_by_name(dev->of_node, "codec");
 158
 159         link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
 160         if (!link->cpu_of_node) {
 161                 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
 162                 return -EINVAL;
 163         }
 164
 165         ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
 166         if (ret < 0)
 167                 goto err_put_codec_n;
 168
 169         link->platform_of_node = link->cpu_of_node;
 170
 171         link->name = "Primary";
 172         link->stream_name = link->name;
 173
 174         ret = devm_snd_soc_register_card(dev, card);
 175         if (ret < 0) {
 176                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 177                 goto err_put_i2s_n;
 178         }
 179
 180         return 0;
 181
 182 err_put_i2s_n:
 183         of_node_put(link->cpu_of_node);
 184 err_put_codec_n:
 185         odroid_put_codec_of_nodes(link);
 186         return ret;
 187 }
 188
 189 static int odroid_audio_remove(struct platform_device *pdev)
 190 {
 191         struct odroid_priv *priv = platform_get_drvdata(pdev);
 192
 193         of_node_put(priv->dai_link.cpu_of_node);
 194         odroid_put_codec_of_nodes(&priv->dai_link);
 195
 196         return 0;
 197 }
 198
 199 static const struct of_device_id odroid_audio_of_match[] = {
 200         { .compatible   = "samsung,odroid-xu3-audio" },
 201         { .compatible   = "samsung,odroid-xu4-audio"},
 202         { },
 203 };
 204 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 205
 206 static struct platform_driver odroid_audio_driver = {
 207         .driver = {
 208                 .name           = "odroid-audio",
 209                 .of_match_table = odroid_audio_of_match,
 210                 .pm             = &snd_soc_pm_ops,
 211         },
 212         .probe  = odroid_audio_probe,
 213         .remove = odroid_audio_remove,
 214 };
 215 module_platform_driver(odroid_audio_driver);
 216
 217 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 218 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 219 MODULE_LICENSE("GPL v2");