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         /* Spinlock protecting fields below */
  25         spinlock_t lock;
  26         unsigned int be_sample_rate;
  27         bool be_active;
  28 };
  29
  30 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
  31 {
  32         struct snd_pcm_runtime *runtime = substream->runtime;
  33
  34         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
  35
  36         return 0;
  37 }
  38
  39 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
  40                                       struct snd_pcm_hw_params *params)
  41 {
  42         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  43         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  44         unsigned long flags;
  45         int ret = 0;
  46
  47         spin_lock_irqsave(&priv->lock, flags);
  48         if (priv->be_active && priv->be_sample_rate != params_rate(params))
  49                 ret = -EINVAL;
  50         spin_unlock_irqrestore(&priv->lock, flags);
  51
  52         return ret;
  53 }
  54
  55 static const struct snd_soc_ops odroid_card_fe_ops = {
  56         .startup = odroid_card_fe_startup,
  57         .hw_params = odroid_card_fe_hw_params,
  58 };
  59
  60 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
  61                                       struct snd_pcm_hw_params *params)
  62 {
  63         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  64         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  65         unsigned int pll_freq, rclk_freq, rfs;
  66         unsigned long flags;
  67         int ret;
  68
  69         switch (params_rate(params)) {
  70         case 64000:
  71                 pll_freq = 196608001U;
  72                 rfs = 384;
  73                 break;
  74         case 44100:
  75         case 88200:
  76                 pll_freq = 180633609U;
  77                 rfs = 512;
  78                 break;
  79         case 32000:
  80         case 48000:
  81         case 96000:
  82                 pll_freq = 196608001U;
  83                 rfs = 512;
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  90         if (ret < 0)
  91                 return ret;
  92
  93         /*
  94          *  We add 2 to the rclk_freq value in order to avoid too low clock
  95          *  frequency values due to the EPLL output frequency not being exact
  96          *  multiple of the audio sampling rate.
  97          */
  98         rclk_freq = params_rate(params) * rfs + 2;
  99
 100         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
 101         if (ret < 0)
 102                 return ret;
 103
 104         if (rtd->num_codecs > 1) {
 105                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
 106
 107                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
 108                                              SND_SOC_CLOCK_IN);
 109                 if (ret < 0)
 110                         return ret;
 111         }
 112
 113         spin_lock_irqsave(&priv->lock, flags);
 114         priv->be_sample_rate = params_rate(params);
 115         spin_unlock_irqrestore(&priv->lock, flags);
 116
 117         return 0;
 118 }
 119
 120 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
 121 {
 122         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 123         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 124         unsigned long flags;
 125
 126         spin_lock_irqsave(&priv->lock, flags);
 127
 128         switch (cmd) {
 129         case SNDRV_PCM_TRIGGER_START:
 130         case SNDRV_PCM_TRIGGER_RESUME:
 131         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 132                 priv->be_active = true;
 133                 break;
 134
 135         case SNDRV_PCM_TRIGGER_STOP:
 136         case SNDRV_PCM_TRIGGER_SUSPEND:
 137         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 138                 priv->be_active = false;
 139                 break;
 140         }
 141
 142         spin_unlock_irqrestore(&priv->lock, flags);
 143
 144         return 0;
 145 }
 146
 147 static const struct snd_soc_ops odroid_card_be_ops = {
 148         .hw_params = odroid_card_be_hw_params,
 149         .trigger = odroid_card_be_trigger,
 150 };
 151
 152 /* DAPM routes for backward compatibility with old DTS */
 153 static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
 154         { "I2S Playback", NULL, "Mixer DAI TX" },
 155         { "HiFi Playback", NULL, "Mixer DAI TX" },
 156 };
 157
 158 static struct snd_soc_dai_link odroid_card_dais[] = {
 159         {
 160                 /* Primary FE <-> BE link */
 161                 .codec_name = "snd-soc-dummy",
 162                 .codec_dai_name = "snd-soc-dummy-dai",
 163                 .ops = &odroid_card_fe_ops,
 164                 .name = "Primary",
 165                 .stream_name = "Primary",
 166                 .platform_name = "3830000.i2s",
 167                 .dynamic = 1,
 168                 .dpcm_playback = 1,
 169         }, {
 170                 /* BE <-> CODECs link */
 171                 .name = "I2S Mixer",
 172                 .cpu_name = "snd-soc-dummy",
 173                 .cpu_dai_name = "snd-soc-dummy-dai",
 174                 .platform_name = "snd-soc-dummy",
 175                 .ops = &odroid_card_be_ops,
 176                 .no_pcm = 1,
 177                 .dpcm_playback = 1,
 178                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 179                                 SND_SOC_DAIFMT_CBS_CFS,
 180         }, {
 181                 /* Secondary FE <-> BE link */
 182                 .playback_only = 1,
 183                 .codec_name = "snd-soc-dummy",
 184                 .codec_dai_name = "snd-soc-dummy-dai",
 185                 .ops = &odroid_card_fe_ops,
 186                 .name = "Secondary",
 187                 .stream_name = "Secondary",
 188                 .platform_name = "3830000.i2s-sec",
 189                 .dynamic = 1,
 190                 .dpcm_playback = 1,
 191         }
 192 };
 193
 194 static int odroid_audio_probe(struct platform_device *pdev)
 195 {
 196         struct device *dev = &pdev->dev;
 197         struct device_node *cpu_dai = NULL;
 198         struct device_node *cpu, *codec;
 199         struct odroid_priv *priv;
 200         struct snd_soc_card *card;
 201         struct snd_soc_dai_link *link, *codec_link;
 202         int num_pcms, ret, i;
 203         struct of_phandle_args args = {};
 204
 205         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 206         if (!priv)
 207                 return -ENOMEM;
 208
 209         card = &priv->card;
 210         card->dev = dev;
 211
 212         card->owner = THIS_MODULE;
 213         card->fully_routed = true;
 214
 215         spin_lock_init(&priv->lock);
 216         snd_soc_card_set_drvdata(card, priv);
 217
 218         ret = snd_soc_of_parse_card_name(card, "model");
 219         if (ret < 0)
 220                 return ret;
 221
 222         if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
 223                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 224                                                 "samsung,audio-widgets");
 225                 if (ret < 0)
 226                         return ret;
 227         }
 228
 229         if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
 230                 ret = snd_soc_of_parse_audio_routing(card,
 231                                                 "samsung,audio-routing");
 232                 if (ret < 0)
 233                         return ret;
 234         }
 235
 236         card->dai_link = odroid_card_dais;
 237         card->num_links = ARRAY_SIZE(odroid_card_dais);
 238
 239         cpu = of_get_child_by_name(dev->of_node, "cpu");
 240         codec = of_get_child_by_name(dev->of_node, "codec");
 241         link = card->dai_link;
 242         codec_link = &card->dai_link[1];
 243
 244         /*
 245          * For backwards compatibility create the secondary CPU DAI link only
 246          * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
 247          * Also add required DAPM routes not available in old DTS.
 248          */
 249         num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
 250                                               "#sound-dai-cells");
 251         if (num_pcms == 1) {
 252                 card->dapm_routes = odroid_dapm_routes;
 253                 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
 254                 card->num_links--;
 255         }
 256
 257         for (i = 0; i < num_pcms; i++, link += 2) {
 258                 ret = of_parse_phandle_with_args(cpu, "sound-dai",
 259                                                  "#sound-dai-cells", i, &args);
 260                 if (ret < 0)
 261                         break;
 262
 263                 if (!args.np) {
 264                         dev_err(dev, "sound-dai property parse error: %d\n", ret);
 265                         ret = -EINVAL;
 266                         break;
 267                 }
 268
 269                 ret = snd_soc_get_dai_name(&args, &link->cpu_dai_name);
 270                 of_node_put(args.np);
 271
 272                 if (ret < 0)
 273                         break;
 274         }
 275         if (ret == 0) {
 276                 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
 277                 if (!cpu_dai)
 278                         ret = -EINVAL;
 279         }
 280
 281         of_node_put(cpu);
 282         of_node_put(codec);
 283         if (ret < 0)
 284                 return ret;
 285
 286         ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
 287         if (ret < 0)
 288                 goto err_put_cpu_dai;
 289
 290         /* Set capture capability only for boards with the MAX98090 CODEC */
 291         if (codec_link->num_codecs > 1) {
 292                 card->dai_link[0].dpcm_capture = 1;
 293                 card->dai_link[1].dpcm_capture = 1;
 294         }
 295
 296         priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
 297         if (IS_ERR(priv->sclk_i2s)) {
 298                 ret = PTR_ERR(priv->sclk_i2s);
 299                 goto err_put_cpu_dai;
 300         }
 301
 302         priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
 303         if (IS_ERR(priv->clk_i2s_bus)) {
 304                 ret = PTR_ERR(priv->clk_i2s_bus);
 305                 goto err_put_sclk;
 306         }
 307         of_node_put(cpu_dai);
 308
 309         ret = devm_snd_soc_register_card(dev, card);
 310         if (ret < 0) {
 311                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
 312                 goto err_put_clk_i2s;
 313         }
 314
 315         return 0;
 316
 317 err_put_clk_i2s:
 318         clk_put(priv->clk_i2s_bus);
 319 err_put_sclk:
 320         clk_put(priv->sclk_i2s);
 321 err_put_cpu_dai:
 322         of_node_put(cpu_dai);
 323         snd_soc_of_put_dai_link_codecs(codec_link);
 324         return ret;
 325 }
 326
 327 static int odroid_audio_remove(struct platform_device *pdev)
 328 {
 329         struct odroid_priv *priv = platform_get_drvdata(pdev);
 330
 331         snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
 332         clk_put(priv->sclk_i2s);
 333         clk_put(priv->clk_i2s_bus);
 334
 335         return 0;
 336 }
 337
 338 static const struct of_device_id odroid_audio_of_match[] = {
 339         { .compatible   = "hardkernel,odroid-xu3-audio" },
 340         { .compatible   = "hardkernel,odroid-xu4-audio" },
 341         { .compatible   = "samsung,odroid-xu3-audio" },
 342         { .compatible   = "samsung,odroid-xu4-audio" },
 343         { },
 344 };
 345 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 346
 347 static struct platform_driver odroid_audio_driver = {
 348         .driver = {
 349                 .name           = "odroid-audio",
 350                 .of_match_table = odroid_audio_of_match,
 351                 .pm             = &snd_soc_pm_ops,
 352         },
 353         .probe  = odroid_audio_probe,
 354         .remove = odroid_audio_remove,
 355 };
 356 module_platform_driver(odroid_audio_driver);
 357
 358 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 359 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 360 MODULE_LICENSE("GPL v2");