1// SPDX-License-Identifier: GPL-2.0-only
2//
3// rt1015p.c  --  RT1015P ALSA SoC audio amplifier driver
4//
5// Copyright 2020 The Linux Foundation. All rights reserved.
6
7#include <linux/acpi.h>
8#include <linux/delay.h>
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/gpio/consumer.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/platform_device.h>
16#include <sound/pcm.h>
17#include <sound/soc.h>
18#include <sound/soc-dai.h>
19#include <sound/soc-dapm.h>
20
21struct rt1015p_priv {
22	struct gpio_desc *sdb;
23	bool calib_done;
24};
25
26static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
27		struct snd_kcontrol *kcontrol, int event)
28{
29	struct snd_soc_component *component =
30		snd_soc_dapm_to_component(w->dapm);
31	struct rt1015p_priv *rt1015p =
32		snd_soc_component_get_drvdata(component);
33
34	if (!rt1015p->sdb)
35		return 0;
36
37	switch (event) {
38	case SND_SOC_DAPM_PRE_PMU:
39		gpiod_set_value_cansleep(rt1015p->sdb, 1);
40		dev_dbg(component->dev, "set sdb to 1");
41
42		if (!rt1015p->calib_done) {
43			msleep(300);
44			rt1015p->calib_done = true;
45		}
46		break;
47	case SND_SOC_DAPM_POST_PMD:
48		gpiod_set_value_cansleep(rt1015p->sdb, 0);
49		dev_dbg(component->dev, "set sdb to 0");
50		break;
51	default:
52		break;
53	}
54
55	return 0;
56}
57
58static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
59	SND_SOC_DAPM_OUTPUT("Speaker"),
60	SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
61			rt1015p_sdb_event,
62			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
63};
64
65static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
66	{"SDB", NULL, "HiFi Playback"},
67	{"Speaker", NULL, "SDB"},
68};
69
70#ifdef CONFIG_PM
71static int rt1015p_suspend(struct snd_soc_component *component)
72{
73	struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
74
75	rt1015p->calib_done = false;
76	return 0;
77}
78#else
79#define rt1015p_suspend NULL
80#endif
81
82static const struct snd_soc_component_driver rt1015p_component_driver = {
83	.suspend		= rt1015p_suspend,
84	.dapm_widgets		= rt1015p_dapm_widgets,
85	.num_dapm_widgets	= ARRAY_SIZE(rt1015p_dapm_widgets),
86	.dapm_routes		= rt1015p_dapm_routes,
87	.num_dapm_routes	= ARRAY_SIZE(rt1015p_dapm_routes),
88	.idle_bias_on		= 1,
89	.use_pmdown_time	= 1,
90	.endianness		= 1,
91};
92
93static struct snd_soc_dai_driver rt1015p_dai_driver = {
94	.name = "HiFi",
95	.playback = {
96		.stream_name	= "HiFi Playback",
97		.formats	= SNDRV_PCM_FMTBIT_S24 |
98					SNDRV_PCM_FMTBIT_S32,
99		.rates		= SNDRV_PCM_RATE_48000,
100		.channels_min	= 1,
101		.channels_max	= 2,
102	},
103};
104
105static int rt1015p_platform_probe(struct platform_device *pdev)
106{
107	struct rt1015p_priv *rt1015p;
108
109	rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
110	if (!rt1015p)
111		return -ENOMEM;
112
113	rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
114				"sdb", GPIOD_OUT_LOW);
115	if (IS_ERR(rt1015p->sdb))
116		return PTR_ERR(rt1015p->sdb);
117
118	dev_set_drvdata(&pdev->dev, rt1015p);
119
120	return devm_snd_soc_register_component(&pdev->dev,
121			&rt1015p_component_driver,
122			&rt1015p_dai_driver, 1);
123}
124
125#ifdef CONFIG_OF
126static const struct of_device_id rt1015p_device_id[] = {
127	{ .compatible = "realtek,rt1015p" },
128	{ .compatible = "realtek,rt1019p" },
129	{}
130};
131MODULE_DEVICE_TABLE(of, rt1015p_device_id);
132#endif
133
134#ifdef CONFIG_ACPI
135static const struct acpi_device_id rt1015p_acpi_match[] = {
136	{ "RTL1015", 0},
137	{ "RTL1019", 0},
138	{ },
139};
140MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
141#endif
142
143static struct platform_driver rt1015p_platform_driver = {
144	.driver = {
145		.name = "rt1015p",
146		.of_match_table = of_match_ptr(rt1015p_device_id),
147		.acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
148	},
149	.probe = rt1015p_platform_probe,
150};
151module_platform_driver(rt1015p_platform_driver);
152
153MODULE_DESCRIPTION("ASoC RT1015P driver");
154MODULE_LICENSE("GPL v2");
155