imx-spdif.c
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/*
* Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#include "fsl_spdif.h"
struct imx_spdif_data {
struct snd_soc_dai_link dai;
struct snd_soc_card card;
};
#define CLK_8K_FREQ 24576000
#define CLK_11K_FREQ 22579200
static int imx_spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct device *dev = rtd->card->dev;
int ret = 0;
u64 rate = params_rate(params);
unsigned int freq;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
freq = do_div(rate, 8000) ? CLK_11K_FREQ : CLK_8K_FREQ;
ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, STC_TXCLK_SPDIF_ROOT,
freq, SND_SOC_CLOCK_OUT);
if (ret)
dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
}
return ret;
}
static struct snd_soc_ops imx_spdif_ops = {
.hw_params = imx_spdif_hw_params,
};
static int imx_spdif_audio_probe(struct platform_device *pdev)
{
struct device_node *spdif_np, *np = pdev->dev.of_node;
struct imx_spdif_data *data;
int ret = 0;
spdif_np = of_parse_phandle(np, "spdif-controller", 0);
if (!spdif_np) {
dev_err(&pdev->dev, "failed to find spdif-controller\n");
ret = -EINVAL;
goto end;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto end;
}
data->dai.name = "S/PDIF PCM";
data->dai.stream_name = "S/PDIF PCM";
data->dai.codec_dai_name = "snd-soc-dummy-dai";
data->dai.codec_name = "snd-soc-dummy";
data->dai.cpu_of_node = spdif_np;
data->dai.platform_of_node = spdif_np;
data->dai.playback_only = true;
data->dai.capture_only = true;
data->dai.ops = &imx_spdif_ops;
if (of_property_read_bool(np, "spdif-out"))
data->dai.capture_only = false;
if (of_property_read_bool(np, "spdif-in"))
data->dai.playback_only = false;
if (data->dai.playback_only && data->dai.capture_only) {
dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
goto end;
}
data->card.dev = &pdev->dev;
data->card.dai_link = &data->dai;
data->card.num_links = 1;
data->card.owner = THIS_MODULE;
ret = snd_soc_of_parse_card_name(&data->card, "model");
if (ret)
goto end;
ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
goto end;
}
end:
of_node_put(spdif_np);
return ret;
}
static const struct of_device_id imx_spdif_dt_ids[] = {
{ .compatible = "fsl,imx-audio-spdif", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
static struct platform_driver imx_spdif_driver = {
.driver = {
.name = "imx-spdif",
.pm = &snd_soc_pm_ops,
.of_match_table = imx_spdif_dt_ids,
},
.probe = imx_spdif_audio_probe,
};
module_platform_driver(imx_spdif_driver);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:imx-spdif");