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/*
* Xilinx DisplayPort Sound Codec support
*
* Copyright (C) 2015 Xilinx, Inc.
*
* Author: Hyun Woo Kwon <hyunk@xilinx.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/clk.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
/**
* struct xilinx_dp_codec - DisplayPort codec
* @aud_clk: audio clock
*/
struct xilinx_dp_codec {
struct clk *aud_clk;
};
struct xilinx_dp_codec_fmt {
unsigned long rate;
unsigned int snd_rate;
};
static struct snd_soc_dai_driver xilinx_dp_codec_dai = {
.name = "xilinx-dp-snd-codec-dai",
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_44100,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
};
static const struct xilinx_dp_codec_fmt rates[] = {
{
.rate = 48000 * 512,
.snd_rate = SNDRV_PCM_RATE_48000
},
{
.rate = 44100 * 512,
.snd_rate = SNDRV_PCM_RATE_44100
}
};
static const struct snd_soc_component_driver xilinx_dp_component_driver = {
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};
static int xilinx_dp_codec_probe(struct platform_device *pdev)
{
struct xilinx_dp_codec *codec;
unsigned int i;
unsigned long rate;
int ret;
codec = devm_kzalloc(&pdev->dev, sizeof(*codec), GFP_KERNEL);
if (!codec)
return -ENOMEM;
codec->aud_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(codec->aud_clk))
return PTR_ERR(codec->aud_clk);
ret = clk_prepare_enable(codec->aud_clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable the aud_clk\n");
return ret;
}
for (i = 0; i < ARRAY_SIZE(rates); i++) {
clk_disable_unprepare(codec->aud_clk);
ret = clk_set_rate(codec->aud_clk, rates[i].rate);
clk_prepare_enable(codec->aud_clk);
if (ret)
continue;
rate = clk_get_rate(codec->aud_clk);
/* Ignore some offset +- 10 */
if (abs(rates[i].rate - rate) < 10) {
xilinx_dp_codec_dai.playback.rates = rates[i].snd_rate;
break;
}
ret = -EINVAL;
}
if (ret) {
dev_err(&pdev->dev, "Failed to get required clock freq\n");
goto error_clk;
}
ret = devm_snd_soc_register_component(&pdev->dev,
&xilinx_dp_component_driver,
&xilinx_dp_codec_dai, 1);
if (ret)
goto error_clk;
platform_set_drvdata(pdev, codec);
dev_info(&pdev->dev, "Xilinx DisplayPort Sound Codec probed\n");
return 0;
error_clk:
clk_disable_unprepare(codec->aud_clk);
return ret;
}
static int xilinx_dp_codec_dev_remove(struct platform_device *pdev)
{
struct xilinx_dp_codec *codec = platform_get_drvdata(pdev);
clk_disable_unprepare(codec->aud_clk);
return 0;
}
static int __maybe_unused xilinx_dp_codec_pm_suspend(struct device *dev)
{
struct xilinx_dp_codec *codec = dev_get_drvdata(dev);
clk_disable_unprepare(codec->aud_clk);
return 0;
}
static int __maybe_unused xilinx_dp_codec_pm_resume(struct device *dev)
{
struct xilinx_dp_codec *codec = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(codec->aud_clk);
if (ret)
dev_err(dev, "failed to enable the aud_clk\n");
return ret;
}
static const struct dev_pm_ops xilinx_dp_codec_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(xilinx_dp_codec_pm_suspend,
xilinx_dp_codec_pm_resume)
};
static const struct of_device_id xilinx_dp_codec_of_match[] = {
{ .compatible = "xlnx,dp-snd-codec", },
{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, xilinx_dp_codec_of_match);
static struct platform_driver xilinx_dp_codec_driver = {
.driver = {
.name = "xilinx-dp-snd-codec",
.of_match_table = xilinx_dp_codec_of_match,
.pm = &xilinx_dp_codec_pm_ops,
},
.probe = xilinx_dp_codec_probe,
.remove = xilinx_dp_codec_dev_remove,
};
module_platform_driver(xilinx_dp_codec_driver);
MODULE_DESCRIPTION("Xilinx DisplayPort Sound Codec module");
MODULE_LICENSE("GPL v2");
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