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/*
* Copyright (C) 2017 Samsung Electronics Co., Ltd.
*
* 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.
*/
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include "i2s.h"
#include "i2s-regs.h"
struct odroid_priv {
struct snd_soc_card card;
struct snd_soc_dai_link dai_link;
struct clk *clk_i2s_bus;
struct clk *sclk_i2s;
};
static int odroid_card_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
return 0;
}
static int odroid_card_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
unsigned int pll_freq, rclk_freq, rfs;
int ret;
switch (params_rate(params)) {
case 64000:
pll_freq = 196608001U;
rfs = 384;
break;
case 44100:
case 88200:
pll_freq = 180633609U;
rfs = 512;
break;
case 32000:
case 48000:
case 96000:
pll_freq = 196608001U;
rfs = 512;
break;
default:
return -EINVAL;
}
ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
if (ret < 0)
return ret;
/*
* We add 2 to the rclk_freq value in order to avoid too low clock
* frequency values due to the EPLL output frequency not being exact
* multiple of the audio sampling rate.
*/
rclk_freq = params_rate(params) * rfs + 2;
ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
if (ret < 0)
return ret;
if (rtd->num_codecs > 1) {
struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
SND_SOC_CLOCK_IN);
if (ret < 0)
return ret;
}
return 0;
}
static const struct snd_soc_ops odroid_card_ops = {
.startup = odroid_card_startup,
.hw_params = odroid_card_hw_params,
};
static int odroid_audio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *cpu, *codec;
struct odroid_priv *priv;
struct snd_soc_dai_link *link;
struct snd_soc_card *card;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
card = &priv->card;
card->dev = dev;
card->owner = THIS_MODULE;
card->fully_routed = true;
snd_soc_card_set_drvdata(card, priv);
ret = snd_soc_of_parse_card_name(card, "model");
if (ret < 0)
return ret;
if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
ret = snd_soc_of_parse_audio_simple_widgets(card,
"samsung,audio-widgets");
if (ret < 0)
return ret;
}
if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
ret = snd_soc_of_parse_audio_routing(card,
"samsung,audio-routing");
if (ret < 0)
return ret;
}
link = &priv->dai_link;
link->ops = &odroid_card_ops;
link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS;
card->dai_link = &priv->dai_link;
card->num_links = 1;
cpu = of_get_child_by_name(dev->of_node, "cpu");
codec = of_get_child_by_name(dev->of_node, "codec");
link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
if (!link->cpu_of_node) {
dev_err(dev, "Failed parsing cpu/sound-dai property\n");
return -EINVAL;
}
ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
if (ret < 0)
goto err_put_codec_n;
link->platform_of_node = link->cpu_of_node;
link->name = "Primary";
link->stream_name = link->name;
priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
if (IS_ERR(priv->sclk_i2s)) {
ret = PTR_ERR(priv->sclk_i2s);
goto err_put_i2s_n;
}
priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
if (IS_ERR(priv->clk_i2s_bus)) {
ret = PTR_ERR(priv->clk_i2s_bus);
goto err_put_sclk;
}
ret = devm_snd_soc_register_card(dev, card);
if (ret < 0) {
dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
goto err_put_clk_i2s;
}
return 0;
err_put_clk_i2s:
clk_put(priv->clk_i2s_bus);
err_put_sclk:
clk_put(priv->sclk_i2s);
err_put_i2s_n:
of_node_put(link->cpu_of_node);
err_put_codec_n:
snd_soc_of_put_dai_link_codecs(link);
return ret;
}
static int odroid_audio_remove(struct platform_device *pdev)
{
struct odroid_priv *priv = platform_get_drvdata(pdev);
of_node_put(priv->dai_link.cpu_of_node);
snd_soc_of_put_dai_link_codecs(&priv->dai_link);
clk_put(priv->sclk_i2s);
clk_put(priv->clk_i2s_bus);
return 0;
}
static const struct of_device_id odroid_audio_of_match[] = {
{ .compatible = "hardkernel,odroid-xu3-audio" },
{ .compatible = "hardkernel,odroid-xu4-audio" },
{ .compatible = "samsung,odroid-xu3-audio" },
{ .compatible = "samsung,odroid-xu4-audio" },
{ },
};
MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
static struct platform_driver odroid_audio_driver = {
.driver = {
.name = "odroid-audio",
.of_match_table = odroid_audio_of_match,
.pm = &snd_soc_pm_ops,
},
.probe = odroid_audio_probe,
.remove = odroid_audio_remove,
};
module_platform_driver(odroid_audio_driver);
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
MODULE_LICENSE("GPL v2");
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