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(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
 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(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(&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
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");