1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
3 *
4 * max98357a.c -- MAX98357A ALSA SoC Codec driver
5 */
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/mod_devicetable.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <sound/pcm.h>
19#include <sound/soc.h>
20#include <sound/soc-dai.h>
21#include <sound/soc-dapm.h>
22
23struct max98357a_priv {
24	struct gpio_desc *sdmode;
25	unsigned int sdmode_delay;
26	int sdmode_switch;
27};
28
29static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
30		int cmd, struct snd_soc_dai *dai)
31{
32	struct snd_soc_component *component = dai->component;
33	struct max98357a_priv *max98357a =
34		snd_soc_component_get_drvdata(component);
35
36	if (!max98357a->sdmode)
37		return 0;
38
39	switch (cmd) {
40	case SNDRV_PCM_TRIGGER_START:
41	case SNDRV_PCM_TRIGGER_RESUME:
42	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
43		mdelay(max98357a->sdmode_delay);
44		if (max98357a->sdmode_switch) {
45			gpiod_set_value(max98357a->sdmode, 1);
46			dev_dbg(component->dev, "set sdmode to 1");
47		}
48		break;
49	case SNDRV_PCM_TRIGGER_STOP:
50	case SNDRV_PCM_TRIGGER_SUSPEND:
51	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
52		gpiod_set_value(max98357a->sdmode, 0);
53		dev_dbg(component->dev, "set sdmode to 0");
54		break;
55	}
56
57	return 0;
58}
59
60static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
61		struct snd_kcontrol *kcontrol, int event)
62{
63	struct snd_soc_component *component =
64		snd_soc_dapm_to_component(w->dapm);
65	struct max98357a_priv *max98357a =
66		snd_soc_component_get_drvdata(component);
67
68	if (event & SND_SOC_DAPM_POST_PMU)
69		max98357a->sdmode_switch = 1;
70	else if (event & SND_SOC_DAPM_POST_PMD)
71		max98357a->sdmode_switch = 0;
72
73	return 0;
74}
75
76static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
77	SND_SOC_DAPM_OUTPUT("Speaker"),
78	SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
79			max98357a_sdmode_event,
80			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
81};
82
83static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
84	{"SD_MODE", NULL, "HiFi Playback"},
85	{"Speaker", NULL, "SD_MODE"},
86};
87
88static const struct snd_soc_component_driver max98357a_component_driver = {
89	.dapm_widgets		= max98357a_dapm_widgets,
90	.num_dapm_widgets	= ARRAY_SIZE(max98357a_dapm_widgets),
91	.dapm_routes		= max98357a_dapm_routes,
92	.num_dapm_routes	= ARRAY_SIZE(max98357a_dapm_routes),
93	.idle_bias_on		= 1,
94	.use_pmdown_time	= 1,
95	.endianness		= 1,
96	.non_legacy_dai_naming	= 1,
97};
98
99static const struct snd_soc_dai_ops max98357a_dai_ops = {
100	.trigger        = max98357a_daiops_trigger,
101};
102
103static struct snd_soc_dai_driver max98357a_dai_driver = {
104	.name = "HiFi",
105	.playback = {
106		.stream_name	= "HiFi Playback",
107		.formats	= SNDRV_PCM_FMTBIT_S16 |
108					SNDRV_PCM_FMTBIT_S24 |
109					SNDRV_PCM_FMTBIT_S32,
110		.rates		= SNDRV_PCM_RATE_8000 |
111					SNDRV_PCM_RATE_16000 |
112					SNDRV_PCM_RATE_32000 |
113					SNDRV_PCM_RATE_44100 |
114					SNDRV_PCM_RATE_48000 |
115					SNDRV_PCM_RATE_88200 |
116					SNDRV_PCM_RATE_96000,
117		.rate_min	= 8000,
118		.rate_max	= 96000,
119		.channels_min	= 1,
120		.channels_max	= 2,
121	},
122	.ops    = &max98357a_dai_ops,
123};
124
125static int max98357a_platform_probe(struct platform_device *pdev)
126{
127	struct max98357a_priv *max98357a;
128	int ret;
129
130	max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
131	if (!max98357a)
132		return -ENOMEM;
133
134	max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
135				"sdmode", GPIOD_OUT_LOW);
136	if (IS_ERR(max98357a->sdmode))
137		return PTR_ERR(max98357a->sdmode);
138
139	ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
140					&max98357a->sdmode_delay);
141	if (ret) {
142		max98357a->sdmode_delay = 0;
143		dev_dbg(&pdev->dev,
144			"no optional property 'sdmode-delay' found, "
145			"default: no delay\n");
146	}
147
148	dev_set_drvdata(&pdev->dev, max98357a);
149
150	return devm_snd_soc_register_component(&pdev->dev,
151			&max98357a_component_driver,
152			&max98357a_dai_driver, 1);
153}
154
155#ifdef CONFIG_OF
156static const struct of_device_id max98357a_device_id[] = {
157	{ .compatible = "maxim,max98357a" },
158	{ .compatible = "maxim,max98360a" },
159	{}
160};
161MODULE_DEVICE_TABLE(of, max98357a_device_id);
162#endif
163
164#ifdef CONFIG_ACPI
165static const struct acpi_device_id max98357a_acpi_match[] = {
166	{ "MX98357A", 0 },
167	{ "MX98360A", 0 },
168	{},
169};
170MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
171#endif
172
173static struct platform_driver max98357a_platform_driver = {
174	.driver = {
175		.name = "max98357a",
176		.of_match_table = of_match_ptr(max98357a_device_id),
177		.acpi_match_table = ACPI_PTR(max98357a_acpi_match),
178	},
179	.probe	= max98357a_platform_probe,
180};
181module_platform_driver(max98357a_platform_driver);
182
183MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
184MODULE_LICENSE("GPL v2");
185