1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
4 * max98357a.c -- MAX98357A ALSA SoC Codec driver
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>
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>
23 struct max98357a_priv {
24 struct gpio_desc *sdmode;
25 unsigned int sdmode_delay;
28 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
29 struct snd_kcontrol *kcontrol, int event)
31 struct snd_soc_component *component =
32 snd_soc_dapm_to_component(w->dapm);
33 struct max98357a_priv *max98357a =
34 snd_soc_component_get_drvdata(component);
36 if (!max98357a->sdmode)
39 if (event & SND_SOC_DAPM_POST_PMU) {
40 msleep(max98357a->sdmode_delay);
41 gpiod_set_value(max98357a->sdmode, 1);
42 dev_dbg(component->dev, "set sdmode to 1");
43 } else if (event & SND_SOC_DAPM_PRE_PMD) {
44 gpiod_set_value(max98357a->sdmode, 0);
45 dev_dbg(component->dev, "set sdmode to 0");
51 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
52 SND_SOC_DAPM_OUTPUT("Speaker"),
53 SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
54 max98357a_sdmode_event,
55 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
59 {"SD_MODE", NULL, "HiFi Playback"},
60 {"Speaker", NULL, "SD_MODE"},
63 static const struct snd_soc_component_driver max98357a_component_driver = {
64 .dapm_widgets = max98357a_dapm_widgets,
65 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
66 .dapm_routes = max98357a_dapm_routes,
67 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
71 .non_legacy_dai_naming = 1,
74 static struct snd_soc_dai_driver max98357a_dai_driver = {
77 .stream_name = "HiFi Playback",
78 .formats = SNDRV_PCM_FMTBIT_S16 |
79 SNDRV_PCM_FMTBIT_S24 |
81 .rates = SNDRV_PCM_RATE_8000 |
82 SNDRV_PCM_RATE_16000 |
83 SNDRV_PCM_RATE_32000 |
84 SNDRV_PCM_RATE_44100 |
85 SNDRV_PCM_RATE_48000 |
86 SNDRV_PCM_RATE_88200 |
95 static int max98357a_platform_probe(struct platform_device *pdev)
97 struct max98357a_priv *max98357a;
100 max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
104 max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
105 "sdmode", GPIOD_OUT_LOW);
106 if (IS_ERR(max98357a->sdmode))
107 return PTR_ERR(max98357a->sdmode);
109 ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
110 &max98357a->sdmode_delay);
112 max98357a->sdmode_delay = 0;
114 "no optional property 'sdmode-delay' found, "
115 "default: no delay\n");
118 dev_set_drvdata(&pdev->dev, max98357a);
120 return devm_snd_soc_register_component(&pdev->dev,
121 &max98357a_component_driver,
122 &max98357a_dai_driver, 1);
126 static const struct of_device_id max98357a_device_id[] = {
127 { .compatible = "maxim,max98357a" },
130 MODULE_DEVICE_TABLE(of, max98357a_device_id);
134 static const struct acpi_device_id max98357a_acpi_match[] = {
139 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
142 static struct platform_driver max98357a_platform_driver = {
145 .of_match_table = of_match_ptr(max98357a_device_id),
146 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
148 .probe = max98357a_platform_probe,
150 module_platform_driver(max98357a_platform_driver);
152 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
153 MODULE_LICENSE("GPL v2");