1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2017 BayLibre, SAS.
4*4882a593Smuzhiyun * Author: Jerome Brunet <jbrunet@baylibre.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/gpio/consumer.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/regulator/consumer.h>
10*4882a593Smuzhiyun #include <sound/soc.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define DRV_NAME "simple-amplifier"
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct simple_amp {
15*4882a593Smuzhiyun struct gpio_desc *gpiod_enable;
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
drv_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * control,int event)18*4882a593Smuzhiyun static int drv_event(struct snd_soc_dapm_widget *w,
19*4882a593Smuzhiyun struct snd_kcontrol *control, int event)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
22*4882a593Smuzhiyun struct simple_amp *priv = snd_soc_component_get_drvdata(c);
23*4882a593Smuzhiyun int val;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun switch (event) {
26*4882a593Smuzhiyun case SND_SOC_DAPM_POST_PMU:
27*4882a593Smuzhiyun val = 1;
28*4882a593Smuzhiyun break;
29*4882a593Smuzhiyun case SND_SOC_DAPM_PRE_PMD:
30*4882a593Smuzhiyun val = 0;
31*4882a593Smuzhiyun break;
32*4882a593Smuzhiyun default:
33*4882a593Smuzhiyun WARN(1, "Unexpected event");
34*4882a593Smuzhiyun return -EINVAL;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun gpiod_set_value_cansleep(priv->gpiod_enable, val);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun return 0;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
43*4882a593Smuzhiyun SND_SOC_DAPM_INPUT("INL"),
44*4882a593Smuzhiyun SND_SOC_DAPM_INPUT("INR"),
45*4882a593Smuzhiyun SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
46*4882a593Smuzhiyun (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
47*4882a593Smuzhiyun SND_SOC_DAPM_OUTPUT("OUTL"),
48*4882a593Smuzhiyun SND_SOC_DAPM_OUTPUT("OUTR"),
49*4882a593Smuzhiyun SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0),
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
53*4882a593Smuzhiyun { "DRV", NULL, "INL" },
54*4882a593Smuzhiyun { "DRV", NULL, "INR" },
55*4882a593Smuzhiyun { "OUTL", NULL, "VCC" },
56*4882a593Smuzhiyun { "OUTR", NULL, "VCC" },
57*4882a593Smuzhiyun { "OUTL", NULL, "DRV" },
58*4882a593Smuzhiyun { "OUTR", NULL, "DRV" },
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun static const struct snd_soc_component_driver simple_amp_component_driver = {
62*4882a593Smuzhiyun .dapm_widgets = simple_amp_dapm_widgets,
63*4882a593Smuzhiyun .num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets),
64*4882a593Smuzhiyun .dapm_routes = simple_amp_dapm_routes,
65*4882a593Smuzhiyun .num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes),
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun
simple_amp_probe(struct platform_device * pdev)68*4882a593Smuzhiyun static int simple_amp_probe(struct platform_device *pdev)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun struct device *dev = &pdev->dev;
71*4882a593Smuzhiyun struct simple_amp *priv;
72*4882a593Smuzhiyun int err;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
75*4882a593Smuzhiyun if (priv == NULL)
76*4882a593Smuzhiyun return -ENOMEM;
77*4882a593Smuzhiyun platform_set_drvdata(pdev, priv);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable",
80*4882a593Smuzhiyun GPIOD_OUT_LOW);
81*4882a593Smuzhiyun if (IS_ERR(priv->gpiod_enable)) {
82*4882a593Smuzhiyun err = PTR_ERR(priv->gpiod_enable);
83*4882a593Smuzhiyun if (err != -EPROBE_DEFER)
84*4882a593Smuzhiyun dev_err(dev, "Failed to get 'enable' gpio: %d", err);
85*4882a593Smuzhiyun return err;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun return devm_snd_soc_register_component(dev,
89*4882a593Smuzhiyun &simple_amp_component_driver,
90*4882a593Smuzhiyun NULL, 0);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun #ifdef CONFIG_OF
94*4882a593Smuzhiyun static const struct of_device_id simple_amp_ids[] = {
95*4882a593Smuzhiyun { .compatible = "dioo,dio2125", },
96*4882a593Smuzhiyun { .compatible = "simple-audio-amplifier", },
97*4882a593Smuzhiyun { }
98*4882a593Smuzhiyun };
99*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, simple_amp_ids);
100*4882a593Smuzhiyun #endif
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun static struct platform_driver simple_amp_driver = {
103*4882a593Smuzhiyun .driver = {
104*4882a593Smuzhiyun .name = DRV_NAME,
105*4882a593Smuzhiyun .of_match_table = of_match_ptr(simple_amp_ids),
106*4882a593Smuzhiyun },
107*4882a593Smuzhiyun .probe = simple_amp_probe,
108*4882a593Smuzhiyun };
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun module_platform_driver(simple_amp_driver);
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
113*4882a593Smuzhiyun MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
114*4882a593Smuzhiyun MODULE_LICENSE("GPL");
115