1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2017 BayLibre, SAS. |
4 | * Author: Jerome Brunet <jbrunet@baylibre.com> |
5 | */ |
6 | |
7 | #include <linux/gpio/consumer.h> |
8 | #include <linux/module.h> |
9 | #include <linux/regulator/consumer.h> |
10 | #include <sound/soc.h> |
11 | |
12 | #define DRV_NAME "simple-amplifier" |
13 | |
14 | struct simple_amp { |
15 | struct gpio_desc *gpiod_enable; |
16 | }; |
17 | |
18 | static int drv_event(struct snd_soc_dapm_widget *w, |
19 | struct snd_kcontrol *control, int event) |
20 | { |
21 | struct snd_soc_component *c = snd_soc_dapm_to_component(dapm: w->dapm); |
22 | struct simple_amp *priv = snd_soc_component_get_drvdata(c); |
23 | int val; |
24 | |
25 | switch (event) { |
26 | case SND_SOC_DAPM_POST_PMU: |
27 | val = 1; |
28 | break; |
29 | case SND_SOC_DAPM_PRE_PMD: |
30 | val = 0; |
31 | break; |
32 | default: |
33 | WARN(1, "Unexpected event" ); |
34 | return -EINVAL; |
35 | } |
36 | |
37 | gpiod_set_value_cansleep(desc: priv->gpiod_enable, value: val); |
38 | |
39 | return 0; |
40 | } |
41 | |
42 | static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = { |
43 | SND_SOC_DAPM_INPUT("INL" ), |
44 | SND_SOC_DAPM_INPUT("INR" ), |
45 | SND_SOC_DAPM_OUT_DRV_E("DRV" , SND_SOC_NOPM, 0, 0, NULL, 0, drv_event, |
46 | (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)), |
47 | SND_SOC_DAPM_OUTPUT("OUTL" ), |
48 | SND_SOC_DAPM_OUTPUT("OUTR" ), |
49 | SND_SOC_DAPM_REGULATOR_SUPPLY("VCC" , 20, 0), |
50 | }; |
51 | |
52 | static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = { |
53 | { "DRV" , NULL, "INL" }, |
54 | { "DRV" , NULL, "INR" }, |
55 | { "OUTL" , NULL, "VCC" }, |
56 | { "OUTR" , NULL, "VCC" }, |
57 | { "OUTL" , NULL, "DRV" }, |
58 | { "OUTR" , NULL, "DRV" }, |
59 | }; |
60 | |
61 | static const struct snd_soc_component_driver simple_amp_component_driver = { |
62 | .dapm_widgets = simple_amp_dapm_widgets, |
63 | .num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets), |
64 | .dapm_routes = simple_amp_dapm_routes, |
65 | .num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes), |
66 | }; |
67 | |
68 | static int simple_amp_probe(struct platform_device *pdev) |
69 | { |
70 | struct device *dev = &pdev->dev; |
71 | struct simple_amp *priv; |
72 | |
73 | priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL); |
74 | if (priv == NULL) |
75 | return -ENOMEM; |
76 | platform_set_drvdata(pdev, data: priv); |
77 | |
78 | priv->gpiod_enable = devm_gpiod_get_optional(dev, con_id: "enable" , |
79 | flags: GPIOD_OUT_LOW); |
80 | if (IS_ERR(ptr: priv->gpiod_enable)) |
81 | return dev_err_probe(dev, err: PTR_ERR(ptr: priv->gpiod_enable), |
82 | fmt: "Failed to get 'enable' gpio" ); |
83 | |
84 | return devm_snd_soc_register_component(dev, |
85 | component_driver: &simple_amp_component_driver, |
86 | NULL, num_dai: 0); |
87 | } |
88 | |
89 | #ifdef CONFIG_OF |
90 | static const struct of_device_id simple_amp_ids[] = { |
91 | { .compatible = "dioo,dio2125" , }, |
92 | { .compatible = "simple-audio-amplifier" , }, |
93 | { } |
94 | }; |
95 | MODULE_DEVICE_TABLE(of, simple_amp_ids); |
96 | #endif |
97 | |
98 | static struct platform_driver simple_amp_driver = { |
99 | .driver = { |
100 | .name = DRV_NAME, |
101 | .of_match_table = of_match_ptr(simple_amp_ids), |
102 | }, |
103 | .probe = simple_amp_probe, |
104 | }; |
105 | |
106 | module_platform_driver(simple_amp_driver); |
107 | |
108 | MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver" ); |
109 | MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>" ); |
110 | MODULE_LICENSE("GPL" ); |
111 | |