sound/soc/cirrus/edb93xx.c

   1 /*
   2  * SoC audio for EDB93xx
   3  *
   4  * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * This driver support CS4271 codec being master or slave, working
  17  * in control port mode, connected either via SPI or I2C.
  18  * The data format accepted is I2S or left-justified.
  19  * DAPM support not implemented.
  20  */
  21
  22 #include <linux/platform_device.h>
  23 #include <linux/gpio.h>
  24 #include <linux/module.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/soc.h>
  28 #include <asm/mach-types.h>
  29 #include <mach/hardware.h>
  30
  31 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
  32                              struct snd_pcm_hw_params *params)
  33 {
  34         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  35         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  36         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  37         int err;
  38         unsigned int mclk_rate;
  39         unsigned int rate = params_rate(params);
  40
  41         /*
  42          * According to CS4271 datasheet we use MCLK/LRCK=256 for
  43          * rates below 50kHz and 128 for higher sample rates
  44          */
  45         if (rate < 50000)
  46                 mclk_rate = rate * 64 * 4;
  47         else
  48                 mclk_rate = rate * 64 * 2;
  49
  50         err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
  51                                      SND_SOC_CLOCK_IN);
  52         if (err)
  53                 return err;
  54
  55         return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
  56                                       SND_SOC_CLOCK_OUT);
  57 }
  58
  59 static const struct snd_soc_ops edb93xx_ops = {
  60         .hw_params      = edb93xx_hw_params,
  61 };
  62
  63 static struct snd_soc_dai_link edb93xx_dai = {
  64         .name           = "CS4271",
  65         .stream_name    = "CS4271 HiFi",
  66         .platform_name  = "ep93xx-i2s",
  67         .cpu_dai_name   = "ep93xx-i2s",
  68         .codec_name     = "spi0.0",
  69         .codec_dai_name = "cs4271-hifi",
  70         .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
  71                           SND_SOC_DAIFMT_CBS_CFS,
  72         .ops            = &edb93xx_ops,
  73 };
  74
  75 static struct snd_soc_card snd_soc_edb93xx = {
  76         .name           = "EDB93XX",
  77         .owner          = THIS_MODULE,
  78         .dai_link       = &edb93xx_dai,
  79         .num_links      = 1,
  80 };
  81
  82 static int edb93xx_probe(struct platform_device *pdev)
  83 {
  84         struct snd_soc_card *card = &snd_soc_edb93xx;
  85         int ret;
  86
  87         ret = ep93xx_i2s_acquire();
  88         if (ret)
  89                 return ret;
  90
  91         card->dev = &pdev->dev;
  92
  93         ret = snd_soc_register_card(card);
  94         if (ret) {
  95                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  96                         ret);
  97                 ep93xx_i2s_release();
  98         }
  99
 100         return ret;
 101 }
 102
 103 static int edb93xx_remove(struct platform_device *pdev)
 104 {
 105         struct snd_soc_card *card = platform_get_drvdata(pdev);
 106
 107         snd_soc_unregister_card(card);
 108         ep93xx_i2s_release();
 109
 110         return 0;
 111 }
 112
 113 static struct platform_driver edb93xx_driver = {
 114         .driver         = {
 115                 .name   = "edb93xx-audio",
 116         },
 117         .probe          = edb93xx_probe,
 118         .remove         = edb93xx_remove,
 119 };
 120
 121 module_platform_driver(edb93xx_driver);
 122
 123 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 124 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 125 MODULE_LICENSE("GPL");
 126 MODULE_ALIAS("platform:edb93xx-audio");