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/clk-provider.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/module.h>
  14 #include <sound/soc.h>
  15 #include <sound/pcm_params.h>
  16 #include "i2s.h"
  17 #include "i2s-regs.h"
  18
  19 struct odroid_priv {
  20         struct snd_soc_card card;
  21         struct clk *clk_i2s_bus;
  22         struct clk *sclk_i2s;
  23 };
  24
  25 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
  26 {
  27         struct snd_pcm_runtime *runtime = substream->runtime;
  28
  29         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
  30
  31         return 0;
  32 }
  33
  34 static const struct snd_soc_ops odroid_card_fe_ops = {
  35         .startup = odroid_card_fe_startup,
  36 };
  37
  38 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
  39                                       struct snd_pcm_hw_params *params)
  40 {
  41         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  42         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  43         unsigned int pll_freq, rclk_freq, rfs;
  44         int ret;
  45
  46         switch (params_rate(params)) {
  47         case 64000:
  48                 pll_freq = 196608001U;
  49                 rfs = 384;
  50                 break;
  51         case 44100:
  52         case 88200:
  53                 pll_freq = 180633609U;
  54                 rfs = 512;
  55                 break;
  56         case 32000:
  57         case 48000:
  58         case 96000:
  59                 pll_freq = 196608001U;
  60                 rfs = 512;
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         }
  65
  66         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  67         if (ret < 0)
  68                 return ret;
  69
  70         /*
  71          *  We add 1 to the rclk_freq value in order to avoid too low clock
  72          *  frequency values due to the EPLL output frequency not being exact
  73          *  multiple of the audio sampling rate.
  74          */
  75         rclk_freq = params_rate(params) * rfs + 1;
  76
  77         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  78         if (ret < 0)
  79                 return ret;
  80
  81         if (rtd->num_codecs > 1) {
  82                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
  83
  84                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
  85                                              SND_SOC_CLOCK_IN);
  86                 if (ret < 0)
  87                         return ret;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static const struct snd_soc_ops odroid_card_be_ops = {
  94         .hw_params = odroid_card_be_hw_params,
  95 };
  96
  97 static struct snd_soc_dai_link odroid_card_dais[] = {
  98         {
  99                 /* Primary FE <-> BE link */
 100                 .codec_name = "snd-soc-dummy",
 101                 .codec_dai_name = "snd-soc-dummy-dai",
 102                 .ops = &odroid_card_fe_ops,
 103                 .name = "Primary",
 104                 .stream_name = "Primary",
 105                 .platform_name = "3830000.i2s",
 106                 .dynamic = 1,
 107                 .dpcm_playback = 1,
 108         }, {
 109                 /* BE <-> CODECs link */
 110                 .name = "I2S Mixer",
 111                 .cpu_name = "snd-soc-dummy",
 112                 .cpu_dai_name = "snd-soc-dummy-dai",
 113                 .platform_name = "snd-soc-dummy",
 114                 .ops = &odroid_card_be_ops,
 115                 .no_pcm = 1,
 116                 .dpcm_playback = 1,
 117                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 118                                 SND_SOC_DAIFMT_CBS_CFS,
 119         }, {
 120                 /* Secondary FE <-> BE link */
 121                 .playback_only = 1,
 122                 .codec_name = "snd-soc-dummy",
 123                 .codec_dai_name = "snd-soc-dummy-dai",
 124                 .ops = &odroid_card_fe_ops,
 125                 .name = "Secondary",
 126                 .stream_name = "Secondary",
 127                 .platform_name = "samsung-i2s-sec",
 128                 .dynamic = 1,
 129                 .dpcm_playback = 1,
 130         }
 131 };
 132
 133 static int odroid_audio_probe(struct platform_device *pdev)
 134 {
 135         struct device *dev = &pdev->dev;
 136         struct device_node *cpu, *cpu_dai, *codec;
 137         struct odroid_priv *priv;
 138         struct snd_soc_card *card;
 139         struct snd_soc_dai_link *link, *codec_link;
 140         int num_pcms, ret, i;
 141         struct of_phandle_args args = {};
 142
 143         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 144         if (!priv)
 145                 return -ENOMEM;
 146
 147         card = &priv->card;
 148         card->dev = dev;
 149
 150         card->owner = THIS_MODULE;
 151         card->fully_routed = true;
 152
 153         snd_soc_card_set_drvdata(card, priv);
 154
 155         ret = snd_soc_of_parse_card_name(card, "model");
 156         if (ret < 0)
 157                 return ret;
 158
 159         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 160                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 161                                                 "samsung,audio-widgets");
 162                 if (ret < 0)
 163                         return ret;
 164         }
 165
 166         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 167                 ret = snd_soc_of_parse_audio_routing(card,
 168                                                 "samsung,audio-routing");
 169                 if (ret < 0)
 170                         return ret;
 171         }
 172
 173         card->dai_link = odroid_card_dais;
 174         card->num_links = ARRAY_SIZE(odroid_card_dais);
 175
 176         cpu = of_get_child_by_name(dev->of_node, "cpu");
 177         codec = of_get_child_by_name(dev->of_node, "codec");
 178         link = card->dai_link;
 179         codec_link = &card->dai_link[1];
 180
 181         /*
 182          * For backwards compatibility create the secondary CPU DAI link only
 183          * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
 184          */
 185         num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
 186                                               "#sound-dai-cells");
 187         if (num_pcms == 1)
 188                 card->num_links--;
 189
 190         for (i = 0; i < num_pcms; i++, link += 2) {
 191                 ret = of_parse_phandle_with_args(cpu, "sound-dai",
 192                                                  "#sound-dai-cells", i, &args);
 193                 if (ret < 0)
 194                         return ret;
 195
 196                 if (!args.np) {
 197                         dev_err(dev, "sound-dai property parse error: %d\n", ret);
 198                         return -EINVAL;
 199                 }
 200
 201                 ret = snd_soc_get_dai_name(&args, &link->cpu_dai_name);
 202                 of_node_put(args.np);
 203
 204                 if (ret < 0)
 205                         return ret;
 206         }
 207
 208         cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
 209         of_node_put(cpu);
 210         of_node_put(codec);
 211
 212         ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
 213         if (ret < 0)
 214                 goto err_put_codec_n;
 215
 216         /* Set capture capability only for boards with the MAX98090 CODEC */
 217         if (codec_link->num_codecs > 1) {
 218                 card->dai_link[0].dpcm_capture = 1;
 219                 card->dai_link[1].dpcm_capture = 1;
 220         }
 221
 222         priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
 223         if (IS_ERR(priv->sclk_i2s)) {
 224                 ret = PTR_ERR(priv->sclk_i2s);
 225                 goto err_put_codec_n;
 226         }
 227
 228         priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
 229         if (IS_ERR(priv->clk_i2s_bus)) {
 230                 ret = PTR_ERR(priv->clk_i2s_bus);
 231                 goto err_put_sclk;
 232         }
 233         of_node_put(cpu_dai);
 234
 235         ret = devm_snd_soc_register_card(dev, card);
 236         if (ret < 0) {
 237                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 238                 goto err_put_clk_i2s;
 239         }
 240
 241         return 0;
 242
 243 err_put_clk_i2s:
 244         clk_put(priv->clk_i2s_bus);
 245 err_put_sclk:
 246         clk_put(priv->sclk_i2s);
 247 err_put_codec_n:
 248         snd_soc_of_put_dai_link_codecs(codec_link);
 249         return ret;
 250 }
 251
 252 static int odroid_audio_remove(struct platform_device *pdev)
 253 {
 254         struct odroid_priv *priv = platform_get_drvdata(pdev);
 255
 256         snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
 257         clk_put(priv->sclk_i2s);
 258         clk_put(priv->clk_i2s_bus);
 259
 260         return 0;
 261 }
 262
 263 static const struct of_device_id odroid_audio_of_match[] = {
 264         { .compatible   = "hardkernel,odroid-xu3-audio" },
 265         { .compatible   = "hardkernel,odroid-xu4-audio" },
 266         { .compatible   = "samsung,odroid-xu3-audio" },
 267         { .compatible   = "samsung,odroid-xu4-audio" },
 268         { },
 269 };
 270 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 271
 272 static struct platform_driver odroid_audio_driver = {
 273         .driver = {
 274                 .name           = "odroid-audio",
 275                 .of_match_table = odroid_audio_of_match,
 276                 .pm             = &snd_soc_pm_ops,
 277         },
 278         .probe  = odroid_audio_probe,
 279         .remove = odroid_audio_remove,
 280 };
 281 module_platform_driver(odroid_audio_driver);
 282
 283 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 284 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 285 MODULE_LICENSE("GPL v2");