LXR linux/sound/soc/generic/audio-graph-card2-custom-sample.c

   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// audio-graph-card2-custom-sample.c
   4//
   5// Copyright (C) 2020 Renesas Electronics Corp.
   6// Copyright (C) 2020 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7//
   8#include <linux/device.h>
   9#include <linux/mod_devicetable.h>
  10#include <linux/module.h>
  11#include <linux/platform_device.h>
  12#include <sound/graph_card.h>
  13
  14/*
  15 * Custom driver can have own priv
  16 * which includes simple_util_priv.
  17 */
  18struct custom_priv {
  19        struct simple_util_priv simple_priv;
  20
  21        /* custom driver's own params */
  22        int custom_params;
  23};
  24
  25/* You can get custom_priv from simple_priv */
  26#define simple_to_custom(simple) container_of((simple), struct custom_priv, simple_priv)
  27
  28static int custom_card_probe(struct snd_soc_card *card)
  29{
  30        struct simple_util_priv *simple_priv = snd_soc_card_get_drvdata(card);
  31        struct custom_priv *custom_priv = simple_to_custom(simple_priv);
  32        struct device *dev = simple_priv_to_dev(simple_priv);
  33
  34        dev_info(dev, "custom probe\n");
  35
  36        custom_priv->custom_params = 1;
  37
  38        /* you can use generic probe function */
  39        return graph_util_card_probe(card);
  40}
  41
  42static int custom_hook_pre(struct simple_util_priv *priv)
  43{
  44        struct device *dev = simple_priv_to_dev(priv);
  45
  46        /* You can custom before parsing */
  47        dev_info(dev, "hook : %s\n", __func__);
  48
  49        return 0;
  50}
  51
  52static int custom_hook_post(struct simple_util_priv *priv)
  53{
  54        struct device *dev = simple_priv_to_dev(priv);
  55        struct snd_soc_card *card;
  56
  57        /* You can custom after parsing */
  58        dev_info(dev, "hook : %s\n", __func__);
  59
  60        /* overwrite .probe sample */
  61        card = simple_priv_to_card(priv);
  62        card->probe = custom_card_probe;
  63
  64        return 0;
  65}
  66
  67static int custom_normal(struct simple_util_priv *priv,
  68                         struct device_node *lnk,
  69                         struct link_info *li)
  70{
  71        struct device *dev = simple_priv_to_dev(priv);
  72
  73        /*
  74         * You can custom Normal parsing
  75         * before/affter audio_graph2_link_normal()
  76         */
  77        dev_info(dev, "hook : %s\n", __func__);
  78
  79        return audio_graph2_link_normal(priv, lnk, li);
  80}
  81
  82static int custom_dpcm(struct simple_util_priv *priv,
  83                       struct device_node *lnk,
  84                       struct link_info *li)
  85{
  86        struct device *dev = simple_priv_to_dev(priv);
  87
  88        /*
  89         * You can custom DPCM parsing
  90         * before/affter audio_graph2_link_dpcm()
  91         */
  92        dev_info(dev, "hook : %s\n", __func__);
  93
  94        return audio_graph2_link_dpcm(priv, lnk, li);
  95}
  96
  97static int custom_c2c(struct simple_util_priv *priv,
  98                      struct device_node *lnk,
  99                      struct link_info *li)
 100{
 101        struct device *dev = simple_priv_to_dev(priv);
 102
 103        /*
 104         * You can custom Codec2Codec parsing
 105         * before/affter audio_graph2_link_c2c()
 106         */
 107        dev_info(dev, "hook : %s\n", __func__);
 108
 109        return audio_graph2_link_c2c(priv, lnk, li);
 110}
 111
 112/*
 113 * audio-graph-card2 has many hooks for your customizing.
 114 */
 115static struct graph2_custom_hooks custom_hooks = {
 116        .hook_pre       = custom_hook_pre,
 117        .hook_post      = custom_hook_post,
 118        .custom_normal  = custom_normal,
 119        .custom_dpcm    = custom_dpcm,
 120        .custom_c2c     = custom_c2c,
 121};
 122
 123static int custom_startup(struct snd_pcm_substream *substream)
 124{
 125        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 126        struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 127        struct device *dev = simple_priv_to_dev(priv);
 128
 129        dev_info(dev, "custom startup\n");
 130
 131        return simple_util_startup(substream);
 132}
 133
 134/* You can use custom ops */
 135static const struct snd_soc_ops custom_ops = {
 136        .startup        = custom_startup,
 137        .shutdown       = simple_util_shutdown,
 138        .hw_params      = simple_util_hw_params,
 139};
 140
 141static int custom_probe(struct platform_device *pdev)
 142{
 143        struct custom_priv *custom_priv;
 144        struct simple_util_priv *simple_priv;
 145        struct device *dev = &pdev->dev;
 146        int ret;
 147
 148        custom_priv = devm_kzalloc(dev, sizeof(*custom_priv), GFP_KERNEL);
 149        if (!custom_priv)
 150                return -ENOMEM;
 151
 152        simple_priv             = &custom_priv->simple_priv;
 153        simple_priv->ops        = &custom_ops; /* customize dai_link ops */
 154
 155        /* "audio-graph-card2-custom-sample" is too long */
 156        simple_priv->snd_card.name = "card2-custom";
 157
 158        /* use audio-graph-card2 parsing with own custom hooks */
 159        ret = audio_graph2_parse_of(simple_priv, dev, &custom_hooks);
 160        if (ret < 0)
 161                return ret;
 162
 163        /* customize more if needed */
 164
 165        return 0;
 166}
 167
 168static const struct of_device_id custom_of_match[] = {
 169        { .compatible = "audio-graph-card2-custom-sample", },
 170        {},
 171};
 172MODULE_DEVICE_TABLE(of, custom_of_match);
 173
 174static struct platform_driver custom_card = {
 175        .driver = {
 176                .name = "audio-graph-card2-custom-sample",
 177                .of_match_table = custom_of_match,
 178        },
 179        .probe  = custom_probe,
 180        .remove = simple_util_remove,
 181};
 182module_platform_driver(custom_card);
 183
 184MODULE_ALIAS("platform:asoc-audio-graph-card2-custom-sample");
 185MODULE_LICENSE("GPL v2");
 186MODULE_DESCRIPTION("ASoC Audio Graph Card2 Custom Sample");
 187MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 188