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rpi-dac.c
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rpi-dac.c
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/*
* ASoC Driver for RPi-DAC.
*
* Author: Florian Meier <florian.meier@koalo.de>
* Copyright 2013
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/jack.h>
static int snd_rpi_rpi_dac_init(struct snd_soc_pcm_runtime *rtd)
{
return 0;
}
static int snd_rpi_rpi_dac_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 *cpu_dai = rtd->cpu_dai;
return snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2);
}
/* machine stream operations */
static struct snd_soc_ops snd_rpi_rpi_dac_ops = {
.hw_params = snd_rpi_rpi_dac_hw_params,
};
static struct snd_soc_dai_link snd_rpi_rpi_dac_dai[] = {
{
.name = "RPi-DAC",
.stream_name = "RPi-DAC HiFi",
.cpu_dai_name = "bcm2708-i2s.0",
.codec_dai_name = "pcm1794a-hifi",
.platform_name = "bcm2708-i2s.0",
.codec_name = "pcm1794a-codec",
.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &snd_rpi_rpi_dac_ops,
.init = snd_rpi_rpi_dac_init,
},
};
/* audio machine driver */
static struct snd_soc_card snd_rpi_rpi_dac = {
.name = "snd_rpi_rpi_dac",
.owner = THIS_MODULE,
.dai_link = snd_rpi_rpi_dac_dai,
.num_links = ARRAY_SIZE(snd_rpi_rpi_dac_dai),
};
static int snd_rpi_rpi_dac_probe(struct platform_device *pdev)
{
int ret = 0;
snd_rpi_rpi_dac.dev = &pdev->dev;
if (pdev->dev.of_node) {
struct device_node *i2s_node;
struct snd_soc_dai_link *dai = &snd_rpi_rpi_dac_dai[0];
i2s_node = of_parse_phandle(pdev->dev.of_node, "i2s-controller", 0);
if (i2s_node) {
dai->cpu_dai_name = NULL;
dai->cpu_of_node = i2s_node;
dai->platform_name = NULL;
dai->platform_of_node = i2s_node;
}
}
ret = snd_soc_register_card(&snd_rpi_rpi_dac);
if (ret)
dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
return ret;
}
static int snd_rpi_rpi_dac_remove(struct platform_device *pdev)
{
return snd_soc_unregister_card(&snd_rpi_rpi_dac);
}
static const struct of_device_id snd_rpi_rpi_dac_of_match[] = {
{ .compatible = "rpi,rpi-dac", },
{},
};
MODULE_DEVICE_TABLE(of, snd_rpi_rpi_dac_of_match);
static struct platform_driver snd_rpi_rpi_dac_driver = {
.driver = {
.name = "snd-rpi-dac",
.owner = THIS_MODULE,
.of_match_table = snd_rpi_rpi_dac_of_match,
},
.probe = snd_rpi_rpi_dac_probe,
.remove = snd_rpi_rpi_dac_remove,
};
module_platform_driver(snd_rpi_rpi_dac_driver);
MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
MODULE_DESCRIPTION("ASoC Driver for RPi-DAC");
MODULE_LICENSE("GPL v2");