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
21struct rt1015p_priv {
22 struct gpio_desc *sdb;
23 bool calib_done;
24};
25
26static 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(dapm: w->dapm);
31 struct rt1015p_priv *rt1015p =
32 snd_soc_component_get_drvdata(c: 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(desc: rt1015p->sdb, value: 1);
40 dev_dbg(component->dev, "set sdb to 1");
41
42 if (!rt1015p->calib_done) {
43 msleep(msecs: 300);
44 rt1015p->calib_done = true;
45 }
46 break;
47 case SND_SOC_DAPM_POST_PMD:
48 gpiod_set_value_cansleep(desc: rt1015p->sdb, value: 0);
49 dev_dbg(component->dev, "set sdb to 0");
50 break;
51 default:
52 break;
53 }
54
55 return 0;
56}
57
58static 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
65static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
66 {"SDB", NULL, "HiFi Playback"},
67 {"Speaker", NULL, "SDB"},
68};
69
70#ifdef CONFIG_PM
71static int rt1015p_suspend(struct snd_soc_component *component)
72{
73 struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(c: component);
74
75 rt1015p->calib_done = false;
76 return 0;
77}
78#else
79#define rt1015p_suspend NULL
80#endif
81
82static 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
93static 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
105static int rt1015p_platform_probe(struct platform_device *pdev)
106{
107 struct rt1015p_priv *rt1015p;
108
109 rt1015p = devm_kzalloc(dev: &pdev->dev, size: sizeof(*rt1015p), GFP_KERNEL);
110 if (!rt1015p)
111 return -ENOMEM;
112
113 rt1015p->sdb = devm_gpiod_get_optional(dev: &pdev->dev,
114 con_id: "sdb", flags: GPIOD_OUT_LOW);
115 if (IS_ERR(ptr: rt1015p->sdb))
116 return PTR_ERR(ptr: rt1015p->sdb);
117
118 dev_set_drvdata(dev: &pdev->dev, data: rt1015p);
119
120 return devm_snd_soc_register_component(dev: &pdev->dev,
121 component_driver: &rt1015p_component_driver,
122 dai_drv: &rt1015p_dai_driver, num_dai: 1);
123}
124
125#ifdef CONFIG_OF
126static const struct of_device_id rt1015p_device_id[] = {
127 { .compatible = "realtek,rt1015p" },
128 { .compatible = "realtek,rt1019p" },
129 {}
130};
131MODULE_DEVICE_TABLE(of, rt1015p_device_id);
132#endif
133
134#ifdef CONFIG_ACPI
135static const struct acpi_device_id rt1015p_acpi_match[] = {
136 { "RTL1015", 0},
137 { "RTL1019", 0},
138 { },
139};
140MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
141#endif
142
143static 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};
151module_platform_driver(rt1015p_platform_driver);
152
153MODULE_DESCRIPTION("ASoC RT1015P driver");
154MODULE_LICENSE("GPL v2");
155

source code of linux/sound/soc/codecs/rt1015p.c