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