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 };
93
94 static struct snd_soc_dai_driver rt1015p_dai_driver = {
95 .name = "HiFi",
96 .playback = {
97 .stream_name = "HiFi Playback",
98 .formats = SNDRV_PCM_FMTBIT_S24 |
99 SNDRV_PCM_FMTBIT_S32,
100 .rates = SNDRV_PCM_RATE_48000,
101 .channels_min = 1,
102 .channels_max = 2,
103 },
104 };
105
rt1015p_platform_probe(struct platform_device * pdev)106 static int rt1015p_platform_probe(struct platform_device *pdev)
107 {
108 struct rt1015p_priv *rt1015p;
109
110 rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
111 if (!rt1015p)
112 return -ENOMEM;
113
114 rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
115 "sdb", GPIOD_OUT_LOW);
116 if (IS_ERR(rt1015p->sdb))
117 return PTR_ERR(rt1015p->sdb);
118
119 dev_set_drvdata(&pdev->dev, rt1015p);
120
121 return devm_snd_soc_register_component(&pdev->dev,
122 &rt1015p_component_driver,
123 &rt1015p_dai_driver, 1);
124 }
125
126 #ifdef CONFIG_OF
127 static const struct of_device_id rt1015p_device_id[] = {
128 { .compatible = "realtek,rt1015p" },
129 { .compatible = "realtek,rt1019p" },
130 {}
131 };
132 MODULE_DEVICE_TABLE(of, rt1015p_device_id);
133 #endif
134
135 #ifdef CONFIG_ACPI
136 static const struct acpi_device_id rt1015p_acpi_match[] = {
137 { "RTL1015", 0},
138 { "RTL1019", 0},
139 { },
140 };
141 MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
142 #endif
143
144 static struct platform_driver rt1015p_platform_driver = {
145 .driver = {
146 .name = "rt1015p",
147 .of_match_table = of_match_ptr(rt1015p_device_id),
148 .acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
149 },
150 .probe = rt1015p_platform_probe,
151 };
152 module_platform_driver(rt1015p_platform_driver);
153
154 MODULE_DESCRIPTION("ASoC RT1015P driver");
155 MODULE_LICENSE("GPL v2");
156