1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sound/soc/codecs/wm8782.c
4 * simple, strap-pin configured 24bit 2ch ADC
5 *
6 * Copyright: 2011 Raumfeld GmbH
7 * Author: Johannes Stezenbach <js@sig21.net>
8 *
9 * based on ad73311.c
10 * Copyright:	Analog Devices Inc.
11 * Author:	Cliff Cai <cliff.cai@analog.com>
12 */
13
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/device.h>
19#include <linux/regulator/consumer.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/ac97_codec.h>
23#include <sound/initval.h>
24#include <sound/soc.h>
25
26/* regulator power supply names */
27static const char *supply_names[] = {
28	"Vdda", /* analog supply, 2.7V - 3.6V */
29	"Vdd",  /* digital supply, 2.7V - 5.5V */
30};
31
32struct wm8782_priv {
33	struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
34	int max_rate;
35};
36
37static int wm8782_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
38{
39	struct snd_pcm_runtime *runtime = sub->runtime;
40	struct wm8782_priv *priv =
41		snd_soc_component_get_drvdata(dai->component);
42
43	return snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
44					   8000, priv->max_rate);
45}
46
47static const struct snd_soc_dapm_widget wm8782_dapm_widgets[] = {
48SND_SOC_DAPM_INPUT("AINL"),
49SND_SOC_DAPM_INPUT("AINR"),
50};
51
52static const struct snd_soc_dapm_route wm8782_dapm_routes[] = {
53	{ "Capture", NULL, "AINL" },
54	{ "Capture", NULL, "AINR" },
55};
56
57static const struct snd_soc_dai_ops wm8782_dai_ops = {
58	.startup = &wm8782_dai_startup,
59};
60
61static struct snd_soc_dai_driver wm8782_dai = {
62	.name = "wm8782",
63	.capture = {
64		.stream_name = "Capture",
65		.channels_min = 2,
66		.channels_max = 2,
67		.rates = SNDRV_PCM_RATE_8000_192000,
68		.formats = SNDRV_PCM_FMTBIT_S16_LE |
69			   SNDRV_PCM_FMTBIT_S20_3LE |
70			   SNDRV_PCM_FMTBIT_S24_LE,
71	},
72	.ops = &wm8782_dai_ops,
73};
74
75static int wm8782_soc_probe(struct snd_soc_component *component)
76{
77	struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
78	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
79}
80
81static void wm8782_soc_remove(struct snd_soc_component *component)
82{
83	struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
84	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
85}
86
87#ifdef CONFIG_PM
88static int wm8782_soc_suspend(struct snd_soc_component *component)
89{
90	struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
91	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
92	return 0;
93}
94
95static int wm8782_soc_resume(struct snd_soc_component *component)
96{
97	struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
98	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
99}
100#else
101#define wm8782_soc_suspend      NULL
102#define wm8782_soc_resume       NULL
103#endif /* CONFIG_PM */
104
105static const struct snd_soc_component_driver soc_component_dev_wm8782 = {
106	.probe			= wm8782_soc_probe,
107	.remove			= wm8782_soc_remove,
108	.suspend		= wm8782_soc_suspend,
109	.resume			= wm8782_soc_resume,
110	.dapm_widgets		= wm8782_dapm_widgets,
111	.num_dapm_widgets	= ARRAY_SIZE(wm8782_dapm_widgets),
112	.dapm_routes		= wm8782_dapm_routes,
113	.num_dapm_routes	= ARRAY_SIZE(wm8782_dapm_routes),
114	.idle_bias_on		= 1,
115	.use_pmdown_time	= 1,
116	.endianness		= 1,
117};
118
119static int wm8782_probe(struct platform_device *pdev)
120{
121	struct device *dev = &pdev->dev;
122	struct device_node *np = dev->of_node;
123	struct wm8782_priv *priv;
124	int ret, i, fsampen;
125
126	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
127	if (!priv)
128		return -ENOMEM;
129
130	dev_set_drvdata(dev, priv);
131
132	for (i = 0; i < ARRAY_SIZE(supply_names); i++)
133		priv->supplies[i].supply = supply_names[i];
134
135	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
136				      priv->supplies);
137	if (ret < 0)
138		return ret;
139
140	// Assume lowest value by default to avoid inadvertent overclocking
141	fsampen = 0;
142
143	if (np)
144		of_property_read_u32(np, "wlf,fsampen", &fsampen);
145
146	switch (fsampen) {
147	case 0:
148		priv->max_rate = 48000;
149		break;
150	case 1:
151		priv->max_rate = 96000;
152		break;
153	case 2:
154		priv->max_rate = 192000;
155		break;
156	default:
157		dev_err(dev, "Invalid wlf,fsampen value");
158		return -EINVAL;
159	}
160
161	return devm_snd_soc_register_component(&pdev->dev,
162			&soc_component_dev_wm8782, &wm8782_dai, 1);
163}
164
165#ifdef CONFIG_OF
166static const struct of_device_id wm8782_of_match[] = {
167	{ .compatible = "wlf,wm8782", },
168	{ }
169};
170MODULE_DEVICE_TABLE(of, wm8782_of_match);
171#endif
172
173static struct platform_driver wm8782_codec_driver = {
174	.driver = {
175		.name = "wm8782",
176		.of_match_table = of_match_ptr(wm8782_of_match),
177	},
178	.probe = wm8782_probe,
179};
180
181module_platform_driver(wm8782_codec_driver);
182
183MODULE_DESCRIPTION("ASoC WM8782 driver");
184MODULE_AUTHOR("Johannes Stezenbach <js@sig21.net>");
185MODULE_LICENSE("GPL");
186