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 <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/soc.h>
  27 #include <asm/mach-types.h>
  28 #include <mach/hardware.h>
  29 #include "ep93xx-pcm.h"
  30
  31 #define edb93xx_has_audio() (machine_is_edb9301() ||    \
  32                              machine_is_edb9302() ||    \
  33                              machine_is_edb9302a() ||   \
  34                              machine_is_edb9307a() ||   \
  35                              machine_is_edb9315a())
  36
  37 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
  38                              struct snd_pcm_hw_params *params)
  39 {
  40         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  41         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  42         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  43         int err;
  44         unsigned int mclk_rate;
  45         unsigned int rate = params_rate(params);
  46
  47         /*
  48          * According to CS4271 datasheet we use MCLK/LRCK=256 for
  49          * rates below 50kHz and 128 for higher sample rates
  50          */
  51         if (rate < 50000)
  52                 mclk_rate = rate * 64 * 4;
  53         else
  54                 mclk_rate = rate * 64 * 2;
  55
  56         err = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  57                                   SND_SOC_DAIFMT_NB_IF |
  58                                   SND_SOC_DAIFMT_CBS_CFS);
  59         if (err)
  60                 return err;
  61
  62         err = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
  63                                   SND_SOC_DAIFMT_NB_IF |
  64                                   SND_SOC_DAIFMT_CBS_CFS);
  65         if (err)
  66                 return err;
  67
  68         err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
  69                                      SND_SOC_CLOCK_IN);
  70         if (err)
  71                 return err;
  72
  73         return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
  74                                       SND_SOC_CLOCK_OUT);
  75 }
  76
  77 static struct snd_soc_ops edb93xx_ops = {
  78         .hw_params      = edb93xx_hw_params,
  79 };
  80
  81 static struct snd_soc_dai_link edb93xx_dai = {
  82         .name           = "CS4271",
  83         .stream_name    = "CS4271 HiFi",
  84         .platform_name  = "ep93xx-pcm-audio",
  85         .cpu_dai_name   = "ep93xx-i2s",
  86         .codec_name     = "spi0.0",
  87         .codec_dai_name = "cs4271-hifi",
  88         .ops            = &edb93xx_ops,
  89 };
  90
  91 static struct snd_soc_card snd_soc_edb93xx = {
  92         .name           = "EDB93XX",
  93         .dai_link       = &edb93xx_dai,
  94         .num_links      = 1,
  95 };
  96
  97 static struct platform_device *edb93xx_snd_device;
  98
  99 static int __init edb93xx_init(void)
 100 {
 101         int ret;
 102
 103         if (!edb93xx_has_audio())
 104                 return -ENODEV;
 105
 106         ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
 107                                  EP93XX_SYSCON_I2SCLKDIV_ORIDE |
 108                                  EP93XX_SYSCON_I2SCLKDIV_SPOL);
 109         if (ret)
 110                 return ret;
 111
 112         edb93xx_snd_device = platform_device_alloc("soc-audio", -1);
 113         if (!edb93xx_snd_device) {
 114                 ret = -ENOMEM;
 115                 goto free_i2s;
 116         }
 117
 118         platform_set_drvdata(edb93xx_snd_device, &snd_soc_edb93xx);
 119         ret = platform_device_add(edb93xx_snd_device);
 120         if (ret)
 121                 goto device_put;
 122
 123         return 0;
 124
 125 device_put:
 126         platform_device_put(edb93xx_snd_device);
 127 free_i2s:
 128         ep93xx_i2s_release();
 129         return ret;
 130 }
 131 module_init(edb93xx_init);
 132
 133 static void __exit edb93xx_exit(void)
 134 {
 135         platform_device_unregister(edb93xx_snd_device);
 136         ep93xx_i2s_release();
 137 }
 138 module_exit(edb93xx_exit);
 139
 140 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 141 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 142 MODULE_LICENSE("GPL");