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
14 struct ssm2305 {
15 /* shutdown gpio */
16 struct gpio_desc *gpiod_shutdown;
17 };
18
19 static 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(w->dapm);
23 struct ssm2305 *data = snd_soc_component_get_drvdata(c);
24
25 gpiod_set_value_cansleep(data->gpiod_shutdown,
26 SND_SOC_DAPM_EVENT_ON(event));
27
28 return 0;
29 }
30
31 static 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
42 static 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
49 static 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
56 static 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, sizeof(*priv), GFP_KERNEL);
63 if (!priv)
64 return -ENOMEM;
65
66 platform_set_drvdata(pdev, priv);
67
68 /* Get shutdown gpio */
69 priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
70 GPIOD_OUT_LOW);
71 if (IS_ERR(priv->gpiod_shutdown))
72 return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown),
73 "Failed to get 'shutdown' gpio\n");
74
75 return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
76 NULL, 0);
77 }
78
79 #ifdef CONFIG_OF
80 static const struct of_device_id ssm2305_of_match[] = {
81 { .compatible = "adi,ssm2305", },
82 { }
83 };
84 MODULE_DEVICE_TABLE(of, ssm2305_of_match);
85 #endif
86
87 static 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
95 module_platform_driver(ssm2305_driver);
96
97 MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
98 MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
99 MODULE_LICENSE("GPL v2");
100
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