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// SPDX-License-Identifier: GPL-2.0
//
// audio-graph-card2-custom-sample.c
//
// Copyright (C) 2020 Renesas Electronics Corp.
// Copyright (C) 2020 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
//
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <sound/graph_card.h>
/*
* Custom driver can have own priv
* which includes asoc_simple_priv.
*/
struct custom_priv {
struct asoc_simple_priv simple_priv;
/* custom driver's own params */
int custom_params;
};
/* You can get custom_priv from simple_priv */
#define simple_to_custom(simple) container_of((simple), struct custom_priv, simple_priv)
static int custom_card_probe(struct snd_soc_card *card)
{
struct asoc_simple_priv *simple_priv = snd_soc_card_get_drvdata(card);
struct custom_priv *custom_priv = simple_to_custom(simple_priv);
struct device *dev = simple_priv_to_dev(simple_priv);
dev_info(dev, "custom probe\n");
custom_priv->custom_params = 1;
/* you can use generic probe function */
return asoc_graph_card_probe(card);
}
static int custom_hook_pre(struct asoc_simple_priv *priv)
{
struct device *dev = simple_priv_to_dev(priv);
/* You can custom before parsing */
dev_info(dev, "hook : %s\n", __func__);
return 0;
}
static int custom_hook_post(struct asoc_simple_priv *priv)
{
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_card *card;
/* You can custom after parsing */
dev_info(dev, "hook : %s\n", __func__);
/* overwrite .probe sample */
card = simple_priv_to_card(priv);
card->probe = custom_card_probe;
return 0;
}
static int custom_normal(struct asoc_simple_priv *priv,
struct device_node *lnk,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
/*
* You can custom Normal parsing
* before/affter audio_graph2_link_normal()
*/
dev_info(dev, "hook : %s\n", __func__);
return audio_graph2_link_normal(priv, lnk, li);
}
static int custom_dpcm(struct asoc_simple_priv *priv,
struct device_node *lnk,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
/*
* You can custom DPCM parsing
* before/affter audio_graph2_link_dpcm()
*/
dev_info(dev, "hook : %s\n", __func__);
return audio_graph2_link_dpcm(priv, lnk, li);
}
static int custom_c2c(struct asoc_simple_priv *priv,
struct device_node *lnk,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
/*
* You can custom Codec2Codec parsing
* before/affter audio_graph2_link_c2c()
*/
dev_info(dev, "hook : %s\n", __func__);
return audio_graph2_link_c2c(priv, lnk, li);
}
/*
* audio-graph-card2 has many hooks for your customizing.
*/
static struct graph2_custom_hooks custom_hooks = {
.hook_pre = custom_hook_pre,
.hook_post = custom_hook_post,
.custom_normal = custom_normal,
.custom_dpcm = custom_dpcm,
.custom_c2c = custom_c2c,
};
static int custom_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
struct device *dev = simple_priv_to_dev(priv);
dev_info(dev, "custom startup\n");
return asoc_simple_startup(substream);
}
/* You can use custom ops */
static const struct snd_soc_ops custom_ops = {
.startup = custom_startup,
.shutdown = asoc_simple_shutdown,
.hw_params = asoc_simple_hw_params,
};
static int custom_probe(struct platform_device *pdev)
{
struct custom_priv *custom_priv;
struct asoc_simple_priv *simple_priv;
struct device *dev = &pdev->dev;
int ret;
custom_priv = devm_kzalloc(dev, sizeof(*custom_priv), GFP_KERNEL);
if (!custom_priv)
return -ENOMEM;
simple_priv = &custom_priv->simple_priv;
simple_priv->ops = &custom_ops; /* customize dai_link ops */
/* use audio-graph-card2 parsing with own custom hooks */
ret = audio_graph2_parse_of(simple_priv, dev, &custom_hooks);
if (ret < 0)
return ret;
/* customize more if needed */
return 0;
}
static const struct of_device_id custom_of_match[] = {
{ .compatible = "audio-graph-card2-custom-sample", },
{},
};
MODULE_DEVICE_TABLE(of, custom_of_match);
static struct platform_driver custom_card = {
.driver = {
.name = "audio-graph-card2-custom-sample",
.of_match_table = custom_of_match,
},
.probe = custom_probe,
.remove = asoc_simple_remove,
};
module_platform_driver(custom_card);
MODULE_ALIAS("platform:asoc-audio-graph-card2-custom-sample");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Audio Graph Card2 Custom Sample");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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