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/device.h>
8#include <linux/err.h>
9#include <linux/gpio.h>
10#include <linux/gpio/consumer.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <sound/pcm.h>
16#include <sound/soc.h>
17#include <sound/soc-dai.h>
18#include <sound/soc-dapm.h>
19
20struct rt1015p_priv {
21	struct gpio_desc *sdb;
22	int sdb_switch;
23};
24
25static int rt1015p_daiops_trigger(struct snd_pcm_substream *substream,
26		int cmd, struct snd_soc_dai *dai)
27{
28	struct snd_soc_component *component = dai->component;
29	struct rt1015p_priv *rt1015p =
30		snd_soc_component_get_drvdata(component);
31
32	if (!rt1015p->sdb)
33		return 0;
34
35	switch (cmd) {
36	case SNDRV_PCM_TRIGGER_START:
37	case SNDRV_PCM_TRIGGER_RESUME:
38	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
39		if (rt1015p->sdb_switch) {
40			gpiod_set_value(rt1015p->sdb, 1);
41			dev_dbg(component->dev, "set sdb to 1");
42		}
43		break;
44	case SNDRV_PCM_TRIGGER_STOP:
45	case SNDRV_PCM_TRIGGER_SUSPEND:
46	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
47		gpiod_set_value(rt1015p->sdb, 0);
48		dev_dbg(component->dev, "set sdb to 0");
49		break;
50	}
51
52	return 0;
53}
54
55static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
56		struct snd_kcontrol *kcontrol, int event)
57{
58	struct snd_soc_component *component =
59		snd_soc_dapm_to_component(w->dapm);
60	struct rt1015p_priv *rt1015p =
61		snd_soc_component_get_drvdata(component);
62
63	if (event & SND_SOC_DAPM_POST_PMU)
64		rt1015p->sdb_switch = 1;
65	else if (event & SND_SOC_DAPM_POST_PMD)
66		rt1015p->sdb_switch = 0;
67
68	return 0;
69}
70
71static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
72	SND_SOC_DAPM_OUTPUT("Speaker"),
73	SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
74			rt1015p_sdb_event,
75			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
76};
77
78static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
79	{"SDB", NULL, "HiFi Playback"},
80	{"Speaker", NULL, "SDB"},
81};
82
83static const struct snd_soc_component_driver rt1015p_component_driver = {
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	.non_legacy_dai_naming	= 1,
92};
93
94static const struct snd_soc_dai_ops rt1015p_dai_ops = {
95	.trigger        = rt1015p_daiops_trigger,
96};
97
98static struct snd_soc_dai_driver rt1015p_dai_driver = {
99	.name = "HiFi",
100	.playback = {
101		.stream_name	= "HiFi Playback",
102		.formats	= SNDRV_PCM_FMTBIT_S24,
103		.rates		= SNDRV_PCM_RATE_48000,
104		.channels_min	= 1,
105		.channels_max	= 2,
106	},
107	.ops    = &rt1015p_dai_ops,
108};
109
110static int rt1015p_platform_probe(struct platform_device *pdev)
111{
112	struct rt1015p_priv *rt1015p;
113
114	rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
115	if (!rt1015p)
116		return -ENOMEM;
117
118	rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
119				"sdb", GPIOD_OUT_LOW);
120	if (IS_ERR(rt1015p->sdb))
121		return PTR_ERR(rt1015p->sdb);
122
123	dev_set_drvdata(&pdev->dev, rt1015p);
124
125	return devm_snd_soc_register_component(&pdev->dev,
126			&rt1015p_component_driver,
127			&rt1015p_dai_driver, 1);
128}
129
130#ifdef CONFIG_OF
131static const struct of_device_id rt1015p_device_id[] = {
132	{ .compatible = "realtek,rt1015p" },
133	{}
134};
135MODULE_DEVICE_TABLE(of, rt1015p_device_id);
136#endif
137
138static struct platform_driver rt1015p_platform_driver = {
139	.driver = {
140		.name = "rt1015p",
141		.of_match_table = of_match_ptr(rt1015p_device_id),
142	},
143	.probe = rt1015p_platform_probe,
144};
145module_platform_driver(rt1015p_platform_driver);
146
147MODULE_DESCRIPTION("ASoC RT1015P driver");
148MODULE_LICENSE("GPL v2");
149