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 | |
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(dapm: 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(desc: aw->gpiod_mode, value: 0); |
24 | udelay(2); |
25 | gpiod_set_value_cansleep(desc: aw->gpiod_mode, value: 1); |
26 | udelay(2); |
27 | } |
28 | msleep(msecs: 40); |
29 | break; |
30 | case SND_SOC_DAPM_PRE_PMD: |
31 | gpiod_set_value_cansleep(desc: aw->gpiod_mode, value: 0); |
32 | usleep_range(min: 1000, max: 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 | |
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, size: sizeof(*aw), GFP_KERNEL); |
68 | if (!aw) |
69 | return -ENOMEM; |
70 | platform_set_drvdata(pdev, data: aw); |
71 | |
72 | aw->gpiod_mode = devm_gpiod_get(dev, con_id: "mode" , flags: GPIOD_OUT_LOW); |
73 | if (IS_ERR(ptr: aw->gpiod_mode)) |
74 | return dev_err_probe(dev, err: PTR_ERR(ptr: aw->gpiod_mode), |
75 | fmt: "Failed to get 'mode' gpio" ); |
76 | |
77 | ret = device_property_read_u32(dev, propname: "awinic,mode" , val: &aw->mode); |
78 | if (ret) |
79 | return -EINVAL; |
80 | |
81 | return devm_snd_soc_register_component(dev: &pdev->dev, |
82 | component_driver: &aw8738_component_driver, |
83 | NULL, num_dai: 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 | |