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