/*
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* SoC audio for EDB93xx
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*
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* Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This driver support CS4271 codec being master or slave, working
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* in control port mode, connected either via SPI or I2C.
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* The data format accepted is I2S or left-justified.
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* DAPM support not implemented.
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*/
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <asm/mach-types.h>
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#include <mach/hardware.h>
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static int edb93xx_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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int err;
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unsigned int mclk_rate;
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unsigned int rate = params_rate(params);
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/*
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* According to CS4271 datasheet we use MCLK/LRCK=256 for
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* rates below 50kHz and 128 for higher sample rates
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*/
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if (rate < 50000)
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mclk_rate = rate * 64 * 4;
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else
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mclk_rate = rate * 64 * 2;
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err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
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SND_SOC_CLOCK_IN);
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if (err)
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return err;
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return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
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SND_SOC_CLOCK_OUT);
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}
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static const struct snd_soc_ops edb93xx_ops = {
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.hw_params = edb93xx_hw_params,
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};
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static struct snd_soc_dai_link edb93xx_dai = {
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.name = "CS4271",
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.stream_name = "CS4271 HiFi",
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.platform_name = "ep93xx-i2s",
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.cpu_dai_name = "ep93xx-i2s",
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.codec_name = "spi0.0",
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.codec_dai_name = "cs4271-hifi",
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.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBS_CFS,
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.ops = &edb93xx_ops,
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};
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static struct snd_soc_card snd_soc_edb93xx = {
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.name = "EDB93XX",
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.owner = THIS_MODULE,
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.dai_link = &edb93xx_dai,
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.num_links = 1,
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};
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static int edb93xx_probe(struct platform_device *pdev)
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{
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struct snd_soc_card *card = &snd_soc_edb93xx;
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int ret;
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ret = ep93xx_i2s_acquire();
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if (ret)
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return ret;
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card->dev = &pdev->dev;
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ret = snd_soc_register_card(card);
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if (ret) {
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dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
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ret);
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ep93xx_i2s_release();
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}
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return ret;
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}
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static int edb93xx_remove(struct platform_device *pdev)
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{
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struct snd_soc_card *card = platform_get_drvdata(pdev);
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snd_soc_unregister_card(card);
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ep93xx_i2s_release();
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return 0;
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}
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static struct platform_driver edb93xx_driver = {
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.driver = {
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.name = "edb93xx-audio",
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},
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.probe = edb93xx_probe,
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.remove = edb93xx_remove,
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};
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module_platform_driver(edb93xx_driver);
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MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
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MODULE_DESCRIPTION("ALSA SoC EDB93xx");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:edb93xx-audio");
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