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;
  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->clk_i2s_bus, pll_freq / 2 + 1);
  62         if (ret < 0)
  63                 return ret;
  64
  65         /*
  66          *  We add 1 to the rclk_freq value in order to avoid too low clock
  67          *  frequency values due to the EPLL output frequency not being exact
  68          *  multiple of the audio sampling rate.
  69          */
  70         rclk_freq = params_rate(params) * 256 + 1;
  71
  72         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  73         if (ret < 0)
  74                 return ret;
  75
  76         if (rtd->num_codecs > 1) {
  77                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
  78
  79                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
  80                                              SND_SOC_CLOCK_IN);
  81                 if (ret < 0)
  82                         return ret;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static const struct snd_soc_ops odroid_card_ops = {
  89         .startup = odroid_card_startup,
  90         .hw_params = odroid_card_hw_params,
  91 };
  92
  93 static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link)
  94 {
  95         struct snd_soc_dai_link_component *component = link->codecs;
  96         int i;
  97
  98         for (i = 0; i < link->num_codecs; i++, component++) {
  99                 if (!component->of_node)
 100                         break;
 101                 of_node_put(component->of_node);
 102         }
 103 }
 104
 105 static int odroid_audio_probe(struct platform_device *pdev)
 106 {
 107         struct device *dev = &pdev->dev;
 108         struct device_node *cpu, *codec;
 109         struct odroid_priv *priv;
 110         struct snd_soc_dai_link *link;
 111         struct snd_soc_card *card;
 112         int ret;
 113
 114         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 115         if (!priv)
 116                 return -ENOMEM;
 117
 118         card = &priv->card;
 119         card->dev = dev;
 120
 121         card->owner = THIS_MODULE;
 122         card->fully_routed = true;
 123
 124         snd_soc_card_set_drvdata(card, priv);
 125
 126         ret = snd_soc_of_parse_card_name(card, "model");
 127         if (ret < 0)
 128                 return ret;
 129
 130         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 131                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 132                                                 "samsung,audio-widgets");
 133                 if (ret < 0)
 134                         return ret;
 135         }
 136
 137         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 138                 ret = snd_soc_of_parse_audio_routing(card,
 139                                                 "samsung,audio-routing");
 140                 if (ret < 0)
 141                         return ret;
 142         }
 143
 144         link = &priv->dai_link;
 145
 146         link->ops = &odroid_card_ops;
 147         link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 148                         SND_SOC_DAIFMT_CBS_CFS;
 149
 150         card->dai_link = &priv->dai_link;
 151         card->num_links = 1;
 152
 153         cpu = of_get_child_by_name(dev->of_node, "cpu");
 154         codec = of_get_child_by_name(dev->of_node, "codec");
 155
 156         link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
 157         if (!link->cpu_of_node) {
 158                 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
 159                 return -EINVAL;
 160         }
 161
 162         ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
 163         if (ret < 0)
 164                 goto err_put_codec_n;
 165
 166         link->platform_of_node = link->cpu_of_node;
 167
 168         link->name = "Primary";
 169         link->stream_name = link->name;
 170
 171
 172         priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
 173         if (IS_ERR(priv->sclk_i2s)) {
 174                 ret = PTR_ERR(priv->sclk_i2s);
 175                 goto err_put_i2s_n;
 176         }
 177
 178         priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
 179         if (IS_ERR(priv->clk_i2s_bus)) {
 180                 ret = PTR_ERR(priv->clk_i2s_bus);
 181                 goto err_put_sclk;
 182         }
 183
 184         ret = devm_snd_soc_register_card(dev, card);
 185         if (ret < 0) {
 186                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 187                 goto err_put_clk_i2s;
 188         }
 189
 190         return 0;
 191
 192 err_put_clk_i2s:
 193         clk_put(priv->clk_i2s_bus);
 194 err_put_sclk:
 195         clk_put(priv->sclk_i2s);
 196 err_put_i2s_n:
 197         of_node_put(link->cpu_of_node);
 198 err_put_codec_n:
 199         odroid_put_codec_of_nodes(link);
 200         return ret;
 201 }
 202
 203 static int odroid_audio_remove(struct platform_device *pdev)
 204 {
 205         struct odroid_priv *priv = platform_get_drvdata(pdev);
 206
 207         of_node_put(priv->dai_link.cpu_of_node);
 208         odroid_put_codec_of_nodes(&priv->dai_link);
 209         clk_put(priv->sclk_i2s);
 210         clk_put(priv->clk_i2s_bus);
 211
 212         return 0;
 213 }
 214
 215 static const struct of_device_id odroid_audio_of_match[] = {
 216         { .compatible   = "samsung,odroid-xu3-audio" },
 217         { .compatible   = "samsung,odroid-xu4-audio"},
 218         { },
 219 };
 220 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 221
 222 static struct platform_driver odroid_audio_driver = {
 223         .driver = {
 224                 .name           = "odroid-audio",
 225                 .of_match_table = odroid_audio_of_match,
 226                 .pm             = &snd_soc_pm_ops,
 227         },
 228         .probe  = odroid_audio_probe,
 229         .remove = odroid_audio_remove,
 230 };
 231 module_platform_driver(odroid_audio_driver);
 232
 233 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 234 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 235 MODULE_LICENSE("GPL v2");