1// SPDX-License-Identifier: GPL-2.0
2//
3// Analog Devices SSM2305 Amplifier Driver
4//
5// Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
6//
7
8#include <linux/gpio/consumer.h>
9#include <linux/module.h>
10#include <sound/soc.h>
11
12#define DRV_NAME "ssm2305"
13
14struct ssm2305 {
15 /* shutdown gpio */
16 struct gpio_desc *gpiod_shutdown;
17};
18
19static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
20 struct snd_kcontrol *kctrl, int event)
21{
22 struct snd_soc_component *c = snd_soc_dapm_to_component(dapm: w->dapm);
23 struct ssm2305 *data = snd_soc_component_get_drvdata(c);
24
25 gpiod_set_value_cansleep(desc: data->gpiod_shutdown,
26 SND_SOC_DAPM_EVENT_ON(event));
27
28 return 0;
29}
30
31static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
32 /* Stereo input/output */
33 SND_SOC_DAPM_INPUT("L_IN"),
34 SND_SOC_DAPM_INPUT("R_IN"),
35 SND_SOC_DAPM_OUTPUT("L_OUT"),
36 SND_SOC_DAPM_OUTPUT("R_OUT"),
37
38 SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
39 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
40};
41
42static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
43 { "L_OUT", NULL, "L_IN" },
44 { "R_OUT", NULL, "R_IN" },
45 { "L_IN", NULL, "Power" },
46 { "R_IN", NULL, "Power" },
47};
48
49static const struct snd_soc_component_driver ssm2305_component_driver = {
50 .dapm_widgets = ssm2305_dapm_widgets,
51 .num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),
52 .dapm_routes = ssm2305_dapm_routes,
53 .num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),
54};
55
56static int ssm2305_probe(struct platform_device *pdev)
57{
58 struct device *dev = &pdev->dev;
59 struct ssm2305 *priv;
60
61 /* Allocate the private data */
62 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
63 if (!priv)
64 return -ENOMEM;
65
66 platform_set_drvdata(pdev, data: priv);
67
68 /* Get shutdown gpio */
69 priv->gpiod_shutdown = devm_gpiod_get(dev, con_id: "shutdown",
70 flags: GPIOD_OUT_LOW);
71 if (IS_ERR(ptr: priv->gpiod_shutdown))
72 return dev_err_probe(dev, err: PTR_ERR(ptr: priv->gpiod_shutdown),
73 fmt: "Failed to get 'shutdown' gpio\n");
74
75 return devm_snd_soc_register_component(dev, component_driver: &ssm2305_component_driver,
76 NULL, num_dai: 0);
77}
78
79#ifdef CONFIG_OF
80static const struct of_device_id ssm2305_of_match[] = {
81 { .compatible = "adi,ssm2305", },
82 { }
83};
84MODULE_DEVICE_TABLE(of, ssm2305_of_match);
85#endif
86
87static struct platform_driver ssm2305_driver = {
88 .driver = {
89 .name = DRV_NAME,
90 .of_match_table = of_match_ptr(ssm2305_of_match),
91 },
92 .probe = ssm2305_probe,
93};
94
95module_platform_driver(ssm2305_driver);
96
97MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
98MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
99MODULE_LICENSE("GPL v2");
100

source code of linux/sound/soc/codecs/ssm2305.c