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