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/*
* Xilinx DisplayPort SoC Sound Card 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/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
static int xilinx_dp_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 256);
return 0;
}
static const struct snd_soc_ops xilinx_dp_ops = {
.startup = xilinx_dp_startup,
};
static struct snd_soc_dai_link xilinx_dp_dai_links[] = {
{
.name = "xilinx-dp0",
.stream_name = "xilinx-dp0",
.codec_dai_name = "xilinx-dp-snd-codec-dai",
.ops = &xilinx_dp_ops,
},
{
.name = "xilinx-dp1",
.stream_name = "xilinx-dp1",
.codec_dai_name = "xilinx-dp-snd-codec-dai",
.ops = &xilinx_dp_ops,
},
};
static struct snd_soc_card xilinx_dp_card = {
.name = "DisplayPort monitor",
.owner = THIS_MODULE,
.dai_link = xilinx_dp_dai_links,
.num_links = 2,
};
static int xilinx_dp_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = &xilinx_dp_card;
struct device_node *node = pdev->dev.of_node;
struct device_node *codec, *pcm;
int ret;
card->dev = &pdev->dev;
codec = of_parse_phandle(node, "xlnx,dp-snd-codec", 0);
if (!codec)
return -ENODEV;
pcm = of_parse_phandle(node, "xlnx,dp-snd-pcm", 0);
if (!pcm)
return -ENODEV;
xilinx_dp_dai_links[0].platform_of_node = pcm;
xilinx_dp_dai_links[0].cpu_of_node = codec;
xilinx_dp_dai_links[0].codec_of_node = codec;
pcm = of_parse_phandle(node, "xlnx,dp-snd-pcm", 1);
if (!pcm)
return -ENODEV;
xilinx_dp_dai_links[1].platform_of_node = pcm;
xilinx_dp_dai_links[1].cpu_of_node = codec;
xilinx_dp_dai_links[1].codec_of_node = codec;
ret = devm_snd_soc_register_card(&pdev->dev, card);
if (ret)
return ret;
dev_info(&pdev->dev, "Xilinx DisplayPort Sound Card probed\n");
return 0;
}
static const struct of_device_id xilinx_dp_of_match[] = {
{ .compatible = "xlnx,dp-snd-card", },
{},
};
MODULE_DEVICE_TABLE(of, xilinx_dp_of_match);
static struct platform_driver xilinx_dp_aud_driver = {
.driver = {
.name = "xilinx-dp-snd-card",
.of_match_table = xilinx_dp_of_match,
.pm = &snd_soc_pm_ops,
},
.probe = xilinx_dp_probe,
};
module_platform_driver(xilinx_dp_aud_driver);
MODULE_DESCRIPTION("Xilinx DisplayPort Sound Card module");
MODULE_LICENSE("GPL v2");
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