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
8 struct aw8738_priv {
9 struct gpio_desc *gpiod_mode;
10 unsigned int mode;
11 };
12
aw8738_drv_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)13 static 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
42 static 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
49 static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {
50 { "DRV", NULL, "IN" },
51 { "OUT", NULL, "DRV" },
52 };
53
54 static 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
aw8738_probe(struct platform_device * pdev)61 static 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
87 static const struct of_device_id aw8738_of_match[] = {
88 { .compatible = "awinic,aw8738" },
89 { }
90 };
91 MODULE_DEVICE_TABLE(of, aw8738_of_match);
92 #endif
93
94 static 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 };
101 module_platform_driver(aw8738_driver);
102
103 MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");
104 MODULE_LICENSE("GPL v2");
105