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         case 176400:
  50                 pll_freq = 180633609U;
  51                 rfs = 512;
  52                 break;
  53         case 32000:
  54         case 48000:
  55         case 96000:
  56         case 192000:
  57                 pll_freq = 196608001U;
  58                 rfs = 512;
  59                 break;
  60         default:
  61                 return -EINVAL;
  62         }
  63
  64         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  65         if (ret < 0)
  66                 return ret;
  67
  68         /*
  69          *  We add 2 to the rclk_freq value in order to avoid too low clock
  70          *  frequency values due to the EPLL output frequency not being exact
  71          *  multiple of the audio sampling rate.
  72          */
  73         rclk_freq = params_rate(params) * rfs + 2;
  74
  75         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  76         if (ret < 0)
  77                 return ret;
  78
  79         if (rtd->num_codecs > 1) {
  80                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
  81
  82                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
  83                                              SND_SOC_CLOCK_IN);
  84                 if (ret < 0)
  85                         return ret;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static const struct snd_soc_ops odroid_card_ops = {
  92         .startup = odroid_card_startup,
  93         .hw_params = odroid_card_hw_params,
  94 };
  95
  96 static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link)
  97 {
  98         struct snd_soc_dai_link_component *component = link->codecs;
  99         int i;
 100
 101         for (i = 0; i < link->num_codecs; i++, component++) {
 102                 if (!component->of_node)
 103                         break;
 104                 of_node_put(component->of_node);
 105         }
 106 }
 107
 108 static int odroid_audio_probe(struct platform_device *pdev)
 109 {
 110         struct device *dev = &pdev->dev;
 111         struct device_node *cpu, *codec;
 112         struct odroid_priv *priv;
 113         struct snd_soc_dai_link *link;
 114         struct snd_soc_card *card;
 115         int ret;
 116
 117         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 118         if (!priv)
 119                 return -ENOMEM;
 120
 121         card = &priv->card;
 122         card->dev = dev;
 123
 124         card->owner = THIS_MODULE;
 125         card->fully_routed = true;
 126
 127         snd_soc_card_set_drvdata(card, priv);
 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
 175         priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
 176         if (IS_ERR(priv->sclk_i2s)) {
 177                 ret = PTR_ERR(priv->sclk_i2s);
 178                 goto err_put_i2s_n;
 179         }
 180
 181         priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
 182         if (IS_ERR(priv->clk_i2s_bus)) {
 183                 ret = PTR_ERR(priv->clk_i2s_bus);
 184                 goto err_put_sclk;
 185         }
 186
 187         ret = devm_snd_soc_register_card(dev, card);
 188         if (ret < 0) {
 189                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 190                 goto err_put_clk_i2s;
 191         }
 192
 193         return 0;
 194
 195 err_put_clk_i2s:
 196         clk_put(priv->clk_i2s_bus);
 197 err_put_sclk:
 198         clk_put(priv->sclk_i2s);
 199 err_put_i2s_n:
 200         of_node_put(link->cpu_of_node);
 201 err_put_codec_n:
 202         odroid_put_codec_of_nodes(link);
 203         return ret;
 204 }
 205
 206 static int odroid_audio_remove(struct platform_device *pdev)
 207 {
 208         struct odroid_priv *priv = platform_get_drvdata(pdev);
 209
 210         of_node_put(priv->dai_link.cpu_of_node);
 211         odroid_put_codec_of_nodes(&priv->dai_link);
 212         clk_put(priv->sclk_i2s);
 213         clk_put(priv->clk_i2s_bus);
 214
 215         return 0;
 216 }
 217
 218 static const struct of_device_id odroid_audio_of_match[] = {
 219         { .compatible   = "samsung,odroid-xu3-audio" },
 220         { .compatible   = "samsung,odroid-xu4-audio"},
 221         { },
 222 };
 223 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 224
 225 static struct platform_driver odroid_audio_driver = {
 226         .driver = {
 227                 .name           = "odroid-audio",
 228                 .of_match_table = odroid_audio_of_match,
 229                 .pm             = &snd_soc_pm_ops,
 230         },
 231         .probe  = odroid_audio_probe,
 232         .remove = odroid_audio_remove,
 233 };
 234 module_platform_driver(odroid_audio_driver);
 235
 236 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 237 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 238 MODULE_LICENSE("GPL v2");