LXR linux/sound/soc/cirrus/edb93xx.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * SoC audio for EDB93xx
   4 *
   5 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
   6 *
   7 * This driver support CS4271 codec being master or slave, working
   8 * in control port mode, connected either via SPI or I2C.
   9 * The data format accepted is I2S or left-justified.
  10 * DAPM support not implemented.
  11 */
  12
  13#include <linux/platform_device.h>
  14#include <linux/gpio.h>
  15#include <linux/module.h>
  16#include <linux/soc/cirrus/ep93xx.h>
  17#include <sound/core.h>
  18#include <sound/pcm.h>
  19#include <sound/soc.h>
  20#include <asm/mach-types.h>
  21
  22static int edb93xx_hw_params(struct snd_pcm_substream *substream,
  23                             struct snd_pcm_hw_params *params)
  24{
  25        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  26        struct snd_soc_dai *codec_dai = rtd->codec_dai;
  27        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  28        int err;
  29        unsigned int mclk_rate;
  30        unsigned int rate = params_rate(params);
  31
  32        /*
  33         * According to CS4271 datasheet we use MCLK/LRCK=256 for
  34         * rates below 50kHz and 128 for higher sample rates
  35         */
  36        if (rate < 50000)
  37                mclk_rate = rate * 64 * 4;
  38        else
  39                mclk_rate = rate * 64 * 2;
  40
  41        err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
  42                                     SND_SOC_CLOCK_IN);
  43        if (err)
  44                return err;
  45
  46        return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
  47                                      SND_SOC_CLOCK_OUT);
  48}
  49
  50static const struct snd_soc_ops edb93xx_ops = {
  51        .hw_params      = edb93xx_hw_params,
  52};
  53
  54static struct snd_soc_dai_link edb93xx_dai = {
  55        .name           = "CS4271",
  56        .stream_name    = "CS4271 HiFi",
  57        .platform_name  = "ep93xx-i2s",
  58        .cpu_dai_name   = "ep93xx-i2s",
  59        .codec_name     = "spi0.0",
  60        .codec_dai_name = "cs4271-hifi",
  61        .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  62                          SND_SOC_DAIFMT_CBS_CFS,
  63        .ops            = &edb93xx_ops,
  64};
  65
  66static struct snd_soc_card snd_soc_edb93xx = {
  67        .name           = "EDB93XX",
  68        .owner          = THIS_MODULE,
  69        .dai_link       = &edb93xx_dai,
  70        .num_links      = 1,
  71};
  72
  73static int edb93xx_probe(struct platform_device *pdev)
  74{
  75        struct snd_soc_card *card = &snd_soc_edb93xx;
  76        int ret;
  77
  78        ret = ep93xx_i2s_acquire();
  79        if (ret)
  80                return ret;
  81
  82        card->dev = &pdev->dev;
  83
  84        ret = snd_soc_register_card(card);
  85        if (ret) {
  86                dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  87                        ret);
  88                ep93xx_i2s_release();
  89        }
  90
  91        return ret;
  92}
  93
  94static int edb93xx_remove(struct platform_device *pdev)
  95{
  96        struct snd_soc_card *card = platform_get_drvdata(pdev);
  97
  98        snd_soc_unregister_card(card);
  99        ep93xx_i2s_release();
 100
 101        return 0;
 102}
 103
 104static struct platform_driver edb93xx_driver = {
 105        .driver         = {
 106                .name   = "edb93xx-audio",
 107        },
 108        .probe          = edb93xx_probe,
 109        .remove         = edb93xx_remove,
 110};
 111
 112module_platform_driver(edb93xx_driver);
 113
 114MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
 115MODULE_DESCRIPTION("ALSA SoC EDB93xx");
 116MODULE_LICENSE("GPL");
 117MODULE_ALIAS("platform:edb93xx-audio");
 118