sound/soc/ep93xx/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 #include "ep93xx-pcm.h"
  31
  32 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
  33                              struct snd_pcm_hw_params *params)
  34 {
  35         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  36         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  37         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  38         int err;
  39         unsigned int mclk_rate;
  40         unsigned int rate = params_rate(params);
  41
  42         /*
  43          * According to CS4271 datasheet we use MCLK/LRCK=256 for
  44          * rates below 50kHz and 128 for higher sample rates
  45          */
  46         if (rate < 50000)
  47                 mclk_rate = rate * 64 * 4;
  48         else
  49                 mclk_rate = rate * 64 * 2;
  50
  51         err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
  52                                      SND_SOC_CLOCK_IN);
  53         if (err)
  54                 return err;
  55
  56         return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
  57                                       SND_SOC_CLOCK_OUT);
  58 }
  59
  60 static struct snd_soc_ops edb93xx_ops = {
  61         .hw_params      = edb93xx_hw_params,
  62 };
  63
  64 static struct snd_soc_dai_link edb93xx_dai = {
  65         .name           = "CS4271",
  66         .stream_name    = "CS4271 HiFi",
  67         .platform_name  = "ep93xx-pcm-audio",
  68         .cpu_dai_name   = "ep93xx-i2s",
  69         .codec_name     = "spi0.0",
  70         .codec_dai_name = "cs4271-hifi",
  71         .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
  72                           SND_SOC_DAIFMT_CBS_CFS,
  73         .ops            = &edb93xx_ops,
  74 };
  75
  76 static struct snd_soc_card snd_soc_edb93xx = {
  77         .name           = "EDB93XX",
  78         .owner          = THIS_MODULE,
  79         .dai_link       = &edb93xx_dai,
  80         .num_links      = 1,
  81 };
  82
  83 static int __devinit edb93xx_probe(struct platform_device *pdev)
  84 {
  85         struct snd_soc_card *card = &snd_soc_edb93xx;
  86         int ret;
  87
  88         ret = ep93xx_i2s_acquire();
  89         if (ret)
  90                 return ret;
  91
  92         card->dev = &pdev->dev;
  93
  94         ret = snd_soc_register_card(card);
  95         if (ret) {
  96                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  97                         ret);
  98                 ep93xx_i2s_release();
  99         }
 100
 101         return ret;
 102 }
 103
 104 static int __devexit edb93xx_remove(struct platform_device *pdev)
 105 {
 106         struct snd_soc_card *card = platform_get_drvdata(pdev);
 107
 108         snd_soc_unregister_card(card);
 109         ep93xx_i2s_release();
 110
 111         return 0;
 112 }
 113
 114 static struct platform_driver edb93xx_driver = {
 115         .driver         = {
 116                 .name   = "edb93xx-audio",
 117                 .owner  = THIS_MODULE,
 118         },
 119         .probe          = edb93xx_probe,
 120         .remove         = __devexit_p(edb93xx_remove),
 121 };
 122
 123 module_platform_driver(edb93xx_driver);
 124
 125 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 126 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 127 MODULE_LICENSE("GPL");
 128 MODULE_ALIAS("platform:edb93xx-audio");