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/*
* Copyright 2012, 2014 Freescale Semiconductor, Inc.
* Copyright 2012 Linaro Ltd.
*
* 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/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#define SUPPORT_RATE_NUM 10
struct imx_priv {
unsigned int mclk_freq;
struct platform_device *pdev;
};
static struct imx_priv card_priv;
static int imx_mqs_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
static struct snd_pcm_hw_constraint_list constraint_rates;
struct imx_priv *priv = &card_priv;
struct device *dev = &priv->pdev->dev;
static u32 support_rates[SUPPORT_RATE_NUM];
int ret;
if (priv->mclk_freq == 24576000) {
support_rates[0] = 48000;
support_rates[1] = 96000;
support_rates[2] = 192000;
constraint_rates.list = support_rates;
constraint_rates.count = 3;
ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&constraint_rates);
if (ret)
return ret;
} else
dev_warn(dev, "mclk may be not supported %d\n", priv->mclk_freq);
return 0;
}
static struct snd_soc_ops imx_mqs_ops = {
.startup = imx_mqs_startup,
};
static struct snd_soc_dai_link imx_mqs_dai = {
.name = "HiFi",
.stream_name = "HiFi",
.dai_fmt = SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS,
.ops = &imx_mqs_ops,
};
static struct snd_soc_card snd_soc_card_imx_mqs = {
.name = "mqs-audio",
.dai_link = &imx_mqs_dai,
.owner = THIS_MODULE,
.num_links = 1,
};
static int imx_mqs_probe(struct platform_device *pdev)
{
struct device_node *cpu_np, *codec_np;
struct imx_priv *priv = &card_priv;
struct clk *codec_clk = NULL;
struct platform_device *codec_dev;
int ret;
priv->pdev = pdev;
cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);
if (!cpu_np) {
ret = -EINVAL;
goto fail;
}
codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
if (!codec_np) {
dev_err(&pdev->dev, "phandle missing or invalid\n");
ret = -EINVAL;
goto fail;
}
codec_dev = of_find_device_by_node(codec_np);
if (!codec_dev) {
dev_err(&codec_dev->dev, "failed to find codec device\n");
ret = -EINVAL;
goto fail;
}
codec_clk = devm_clk_get(&codec_dev->dev, NULL);
if (IS_ERR(codec_clk)) {
ret = PTR_ERR(codec_clk);
dev_err(&codec_dev->dev, "failed to get codec clk: %d\n", ret);
goto fail;
}
priv->mclk_freq = clk_get_rate(codec_clk);
imx_mqs_dai.cpu_of_node = cpu_np;
imx_mqs_dai.platform_of_node = cpu_np;
imx_mqs_dai.codec_dai_name = "fsl-mqs-dai";
imx_mqs_dai.codec_of_node = codec_np;
snd_soc_card_imx_mqs.dev = &pdev->dev;
ret = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_imx_mqs);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
goto fail;
}
fail:
if (cpu_np)
of_node_put(cpu_np);
return ret;
}
static const struct of_device_id imx_mqs_dt_ids[] = {
{ .compatible = "fsl,imx-audio-mqs", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_mqs_dt_ids);
static struct platform_driver imx_mqs_driver = {
.driver = {
.name = "imx-mqs",
.of_match_table = imx_mqs_dt_ids,
},
.probe = imx_mqs_probe,
};
module_platform_driver(imx_mqs_driver);
MODULE_AUTHOR("Nicolin Chen <Guangyu.Chen@freescale.com>");
MODULE_DESCRIPTION("Freescale i.MX MQS ASoC machine driver");
MODULE_ALIAS("platform:imx-mqs");
MODULE_LICENSE("GPL v2");
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