LXR linux/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
  31static 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
  59static const struct snd_soc_ops edb93xx_ops = {
  60        .hw_params      = edb93xx_hw_params,
  61};
  62
  63static 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
  75static 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
  82static 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
 103static 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
 113static struct platform_driver edb93xx_driver = {
 114        .driver         = {
 115                .name   = "edb93xx-audio",
 116        },
 117        .probe          = edb93xx_probe,
 118        .remove         = edb93xx_remove,
 119};
 120
 121module_platform_driver(edb93xx_driver);
 122
 123MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 124MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 125MODULE_LICENSE("GPL");
 126MODULE_ALIAS("platform:edb93xx-audio");
 127