1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/gpio/consumer.h>
4#include <linux/module.h>
5#include <linux/regulator/consumer.h>
6#include <sound/soc.h>
7
8struct aw8738_priv {
9	struct gpio_desc *gpiod_mode;
10	unsigned int mode;
11};
12
13static int aw8738_drv_event(struct snd_soc_dapm_widget *w,
14			    struct snd_kcontrol *kcontrol, int event)
15{
16	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
17	struct aw8738_priv *aw = snd_soc_component_get_drvdata(c);
18	int i;
19
20	switch (event) {
21	case SND_SOC_DAPM_POST_PMU:
22		for (i = 0; i < aw->mode; i++) {
23			gpiod_set_value_cansleep(aw->gpiod_mode, 0);
24			udelay(2);
25			gpiod_set_value_cansleep(aw->gpiod_mode, 1);
26			udelay(2);
27		}
28		msleep(40);
29		break;
30	case SND_SOC_DAPM_PRE_PMD:
31		gpiod_set_value_cansleep(aw->gpiod_mode, 0);
32		usleep_range(1000, 2000);
33		break;
34	default:
35		WARN(1, "Unexpected event");
36		return -EINVAL;
37	}
38
39	return 0;
40}
41
42static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {
43	SND_SOC_DAPM_INPUT("IN"),
44	SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,
45			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
46	SND_SOC_DAPM_OUTPUT("OUT"),
47};
48
49static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {
50	{ "DRV", NULL, "IN" },
51	{ "OUT", NULL, "DRV" },
52};
53
54static const struct snd_soc_component_driver aw8738_component_driver = {
55	.dapm_widgets = aw8738_dapm_widgets,
56	.num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),
57	.dapm_routes = aw8738_dapm_routes,
58	.num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),
59};
60
61static int aw8738_probe(struct platform_device *pdev)
62{
63	struct device *dev = &pdev->dev;
64	struct aw8738_priv *aw;
65	int ret;
66
67	aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);
68	if (!aw)
69		return -ENOMEM;
70	platform_set_drvdata(pdev, aw);
71
72	aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
73	if (IS_ERR(aw->gpiod_mode))
74		return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),
75				     "Failed to get 'mode' gpio");
76
77	ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);
78	if (ret)
79		return -EINVAL;
80
81	return devm_snd_soc_register_component(&pdev->dev,
82					       &aw8738_component_driver,
83					       NULL, 0);
84}
85
86#ifdef CONFIG_OF
87static const struct of_device_id aw8738_of_match[] = {
88	{ .compatible = "awinic,aw8738" },
89	{ }
90};
91MODULE_DEVICE_TABLE(of, aw8738_of_match);
92#endif
93
94static struct platform_driver aw8738_driver = {
95	.probe	= aw8738_probe,
96	.driver = {
97		.name = "aw8738",
98		.of_match_table = of_match_ptr(aw8738_of_match),
99	},
100};
101module_platform_driver(aw8738_driver);
102
103MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");
104MODULE_LICENSE("GPL v2");
105