1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ASoC driver for PROTO AudioCODEC (with a WM8731)
4 *
5 * Author:      Florian Meier, <koalo@koalo.de>
6 *	      Copyright 2013
7 */
8
9#include <linux/module.h>
10#include <linux/platform_device.h>
11
12#include <sound/core.h>
13#include <sound/pcm.h>
14#include <sound/soc.h>
15#include <sound/jack.h>
16
17#include "../codecs/wm8731.h"
18
19#define XTAL_RATE 12288000	/* This is fixed on this board */
20
21static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
22{
23	struct snd_soc_card *card = rtd->card;
24	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
25
26	/* Set proto sysclk */
27	int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
28					 XTAL_RATE, SND_SOC_CLOCK_IN);
29	if (ret < 0) {
30		dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
31			ret);
32		return ret;
33	}
34
35	return 0;
36}
37
38static const struct snd_soc_dapm_widget snd_proto_widget[] = {
39	SND_SOC_DAPM_MIC("Microphone Jack", NULL),
40	SND_SOC_DAPM_HP("Headphone Jack", NULL),
41};
42
43static const struct snd_soc_dapm_route snd_proto_route[] = {
44	/* speaker connected to LHPOUT/RHPOUT */
45	{"Headphone Jack", NULL, "LHPOUT"},
46	{"Headphone Jack", NULL, "RHPOUT"},
47
48	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
49	{"MICIN", NULL, "Mic Bias"},
50	{"Mic Bias", NULL, "Microphone Jack"},
51};
52
53/* audio machine driver */
54static struct snd_soc_card snd_proto = {
55	.name		= "snd_mikroe_proto",
56	.owner		= THIS_MODULE,
57	.dapm_widgets	= snd_proto_widget,
58	.num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
59	.dapm_routes	= snd_proto_route,
60	.num_dapm_routes = ARRAY_SIZE(snd_proto_route),
61};
62
63static int snd_proto_probe(struct platform_device *pdev)
64{
65	struct snd_soc_dai_link *dai;
66	struct snd_soc_dai_link_component *comp;
67	struct device_node *np = pdev->dev.of_node;
68	struct device_node *codec_np, *cpu_np;
69	struct device_node *bitclkmaster = NULL;
70	struct device_node *framemaster = NULL;
71	unsigned int dai_fmt;
72	int ret = 0;
73
74	if (!np) {
75		dev_err(&pdev->dev, "No device node supplied\n");
76		return -EINVAL;
77	}
78
79	snd_proto.dev = &pdev->dev;
80	ret = snd_soc_of_parse_card_name(&snd_proto, "model");
81	if (ret)
82		return ret;
83
84	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
85	if (!dai)
86		return -ENOMEM;
87
88	/* for cpus/codecs/platforms */
89	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
90	if (!comp)
91		return -ENOMEM;
92
93	snd_proto.dai_link = dai;
94	snd_proto.num_links = 1;
95
96	dai->cpus = &comp[0];
97	dai->num_cpus = 1;
98	dai->codecs = &comp[1];
99	dai->num_codecs = 1;
100	dai->platforms = &comp[2];
101	dai->num_platforms = 1;
102
103	dai->name = "WM8731";
104	dai->stream_name = "WM8731 HiFi";
105	dai->codecs->dai_name = "wm8731-hifi";
106	dai->init = &snd_proto_init;
107
108	codec_np = of_parse_phandle(np, "audio-codec", 0);
109	if (!codec_np) {
110		dev_err(&pdev->dev, "audio-codec node missing\n");
111		return -EINVAL;
112	}
113	dai->codecs->of_node = codec_np;
114
115	cpu_np = of_parse_phandle(np, "i2s-controller", 0);
116	if (!cpu_np) {
117		dev_err(&pdev->dev, "i2s-controller missing\n");
118		ret = -EINVAL;
119		goto put_codec_node;
120	}
121	dai->cpus->of_node = cpu_np;
122	dai->platforms->of_node = cpu_np;
123
124	dai_fmt = snd_soc_daifmt_parse_format(np, NULL);
125	snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL,
126						       &bitclkmaster, &framemaster);
127	if (bitclkmaster != framemaster) {
128		dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
129		ret = -EINVAL;
130		goto put_cpu_node;
131	}
132	if (bitclkmaster) {
133		if (codec_np == bitclkmaster)
134			dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
135		else
136			dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
137	} else {
138		dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
139	}
140
141
142	dai->dai_fmt = dai_fmt;
143	ret = snd_soc_register_card(&snd_proto);
144	if (ret)
145		dev_err_probe(&pdev->dev, ret,
146			"snd_soc_register_card() failed\n");
147
148
149put_cpu_node:
150	of_node_put(bitclkmaster);
151	of_node_put(framemaster);
152	of_node_put(cpu_np);
153put_codec_node:
154	of_node_put(codec_np);
155	return ret;
156}
157
158static void snd_proto_remove(struct platform_device *pdev)
159{
160	snd_soc_unregister_card(&snd_proto);
161}
162
163static const struct of_device_id snd_proto_of_match[] = {
164	{ .compatible = "mikroe,mikroe-proto", },
165	{},
166};
167MODULE_DEVICE_TABLE(of, snd_proto_of_match);
168
169static struct platform_driver snd_proto_driver = {
170	.driver = {
171		.name   = "snd-mikroe-proto",
172		.of_match_table = snd_proto_of_match,
173	},
174	.probe	  = snd_proto_probe,
175	.remove_new	 = snd_proto_remove,
176};
177
178module_platform_driver(snd_proto_driver);
179
180MODULE_AUTHOR("Florian Meier");
181MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
182MODULE_LICENSE("GPL");
183