1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // rt1015p.c -- RT1015P ALSA SoC audio amplifier driver
4 //
5 // Copyright 2020 The Linux Foundation. All rights reserved.
6
7 #include <linux/acpi.h>
8 #include <linux/delay.h>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <sound/pcm.h>
17 #include <sound/soc.h>
18 #include <sound/soc-dai.h>
19 #include <sound/soc-dapm.h>
20
21 struct rt1015p_priv {
22 struct gpio_desc *sdb;
23 bool calib_done;
24 };
25
26 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
27 struct snd_kcontrol *kcontrol, int event)
28 {
29 struct snd_soc_component *component =
30 snd_soc_dapm_to_component(w->dapm);
31 struct rt1015p_priv *rt1015p =
32 snd_soc_component_get_drvdata(component);
33
34 if (!rt1015p->sdb)
35 return 0;
36
37 switch (event) {
38 case SND_SOC_DAPM_PRE_PMU:
39 gpiod_set_value_cansleep(rt1015p->sdb, 1);
40 dev_dbg(component->dev, "set sdb to 1");
41
42 if (!rt1015p->calib_done) {
43 msleep(300);
44 rt1015p->calib_done = true;
45 }
46 break;
47 case SND_SOC_DAPM_POST_PMD:
48 gpiod_set_value_cansleep(rt1015p->sdb, 0);
49 dev_dbg(component->dev, "set sdb to 0");
50 break;
51 default:
52 break;
53 }
54
55 return 0;
56 }
57
58 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
59 SND_SOC_DAPM_OUTPUT("Speaker"),
60 SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
61 rt1015p_sdb_event,
62 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
63 };
64
65 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
66 {"SDB", NULL, "HiFi Playback"},
67 {"Speaker", NULL, "SDB"},
68 };
69
70 #ifdef CONFIG_PM
71 static int rt1015p_suspend(struct snd_soc_component *component)
72 {
73 struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
74
75 rt1015p->calib_done = false;
76 return 0;
77 }
78 #else
79 #define rt1015p_suspend NULL
80 #endif
81
82 static const struct snd_soc_component_driver rt1015p_component_driver = {
83 .suspend = rt1015p_suspend,
84 .dapm_widgets = rt1015p_dapm_widgets,
85 .num_dapm_widgets = ARRAY_SIZE(rt1015p_dapm_widgets),
86 .dapm_routes = rt1015p_dapm_routes,
87 .num_dapm_routes = ARRAY_SIZE(rt1015p_dapm_routes),
88 .idle_bias_on = 1,
89 .use_pmdown_time = 1,
90 .endianness = 1,
91 };
92
93 static struct snd_soc_dai_driver rt1015p_dai_driver = {
94 .name = "HiFi",
95 .playback = {
96 .stream_name = "HiFi Playback",
97 .formats = SNDRV_PCM_FMTBIT_S24 |
98 SNDRV_PCM_FMTBIT_S32,
99 .rates = SNDRV_PCM_RATE_48000,
100 .channels_min = 1,
101 .channels_max = 2,
102 },
103 };
104
105 static int rt1015p_platform_probe(struct platform_device *pdev)
106 {
107 struct rt1015p_priv *rt1015p;
108
109 rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
110 if (!rt1015p)
111 return -ENOMEM;
112
113 rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
114 "sdb", GPIOD_OUT_LOW);
115 if (IS_ERR(rt1015p->sdb))
116 return PTR_ERR(rt1015p->sdb);
117
118 dev_set_drvdata(&pdev->dev, rt1015p);
119
120 return devm_snd_soc_register_component(&pdev->dev,
121 &rt1015p_component_driver,
122 &rt1015p_dai_driver, 1);
123 }
124
125 #ifdef CONFIG_OF
126 static const struct of_device_id rt1015p_device_id[] = {
127 { .compatible = "realtek,rt1015p" },
128 { .compatible = "realtek,rt1019p" },
129 {}
130 };
131 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
132 #endif
133
134 #ifdef CONFIG_ACPI
135 static const struct acpi_device_id rt1015p_acpi_match[] = {
136 { "RTL1015", 0},
137 { "RTL1019", 0},
138 { },
139 };
140 MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
141 #endif
142
143 static struct platform_driver rt1015p_platform_driver = {
144 .driver = {
145 .name = "rt1015p",
146 .of_match_table = of_match_ptr(rt1015p_device_id),
147 .acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
148 },
149 .probe = rt1015p_platform_probe,
150 };
151 module_platform_driver(rt1015p_platform_driver);
152
153 MODULE_DESCRIPTION("ASoC RT1015P driver");
154 MODULE_LICENSE("GPL v2");
155
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