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.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <sound/pcm.h>
18 #include <sound/soc.h>
19 #include <sound/soc-dai.h>
20 #include <sound/soc-dapm.h>
21
22 struct rt1015p_priv {
23 struct gpio_desc *sdb;
24 bool calib_done;
25 };
26
rt1015p_sdb_event(struct snd_soc_dapm_widget * w,struct snd_kcontrol * kcontrol,int event)27 static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
28 struct snd_kcontrol *kcontrol, int event)
29 {
30 struct snd_soc_component *component =
31 snd_soc_dapm_to_component(w->dapm);
32 struct rt1015p_priv *rt1015p =
33 snd_soc_component_get_drvdata(component);
34
35 if (!rt1015p->sdb)
36 return 0;
37
38 switch (event) {
39 case SND_SOC_DAPM_PRE_PMU:
40 gpiod_set_value_cansleep(rt1015p->sdb, 1);
41 dev_dbg(component->dev, "set sdb to 1");
42
43 if (!rt1015p->calib_done) {
44 msleep(300);
45 rt1015p->calib_done = true;
46 }
47 break;
48 case SND_SOC_DAPM_POST_PMD:
49 gpiod_set_value_cansleep(rt1015p->sdb, 0);
50 dev_dbg(component->dev, "set sdb to 0");
51 break;
52 default:
53 break;
54 }
55
56 return 0;
57 }
58
59 static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
60 SND_SOC_DAPM_OUTPUT("Speaker"),
61 SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
62 rt1015p_sdb_event,
63 SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
64 };
65
66 static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
67 {"SDB", NULL, "HiFi Playback"},
68 {"Speaker", NULL, "SDB"},
69 };
70
71 #ifdef CONFIG_PM
rt1015p_suspend(struct snd_soc_component * component)72 static int rt1015p_suspend(struct snd_soc_component *component)
73 {
74 struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);
75
76 rt1015p->calib_done = false;
77 return 0;
78 }
79 #else
80 #define rt1015p_suspend NULL
81 #endif
82
83 static const struct snd_soc_component_driver rt1015p_component_driver = {
84 .suspend = rt1015p_suspend,
85 .dapm_widgets = rt1015p_dapm_widgets,
86 .num_dapm_widgets = ARRAY_SIZE(rt1015p_dapm_widgets),
87 .dapm_routes = rt1015p_dapm_routes,
88 .num_dapm_routes = ARRAY_SIZE(rt1015p_dapm_routes),
89 .idle_bias_on = 1,
90 .use_pmdown_time = 1,
91 .endianness = 1,
92 .non_legacy_dai_naming = 1,
93 };
94
95 static struct snd_soc_dai_driver rt1015p_dai_driver = {
96 .name = "HiFi",
97 .playback = {
98 .stream_name = "HiFi Playback",
99 .formats = SNDRV_PCM_FMTBIT_S24 |
100 SNDRV_PCM_FMTBIT_S32,
101 .rates = SNDRV_PCM_RATE_48000,
102 .channels_min = 1,
103 .channels_max = 2,
104 },
105 };
106
rt1015p_platform_probe(struct platform_device * pdev)107 static int rt1015p_platform_probe(struct platform_device *pdev)
108 {
109 struct rt1015p_priv *rt1015p;
110
111 rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
112 if (!rt1015p)
113 return -ENOMEM;
114
115 rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
116 "sdb", GPIOD_OUT_LOW);
117 if (IS_ERR(rt1015p->sdb))
118 return PTR_ERR(rt1015p->sdb);
119
120 dev_set_drvdata(&pdev->dev, rt1015p);
121
122 return devm_snd_soc_register_component(&pdev->dev,
123 &rt1015p_component_driver,
124 &rt1015p_dai_driver, 1);
125 }
126
127 #ifdef CONFIG_OF
128 static const struct of_device_id rt1015p_device_id[] = {
129 { .compatible = "realtek,rt1015p" },
130 { .compatible = "realtek,rt1019p" },
131 {}
132 };
133 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
134 #endif
135
136 #ifdef CONFIG_ACPI
137 static const struct acpi_device_id rt1015p_acpi_match[] = {
138 { "RTL1015", 0},
139 { "RTL1019", 0},
140 { },
141 };
142 MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
143 #endif
144
145 static struct platform_driver rt1015p_platform_driver = {
146 .driver = {
147 .name = "rt1015p",
148 .of_match_table = of_match_ptr(rt1015p_device_id),
149 .acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
150 },
151 .probe = rt1015p_platform_probe,
152 };
153 module_platform_driver(rt1015p_platform_driver);
154
155 MODULE_DESCRIPTION("ASoC RT1015P driver");
156 MODULE_LICENSE("GPL v2");
157