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/device.h>
10 #include <linux/gpio.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/kernel.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/module.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>
22 struct max98357a_priv
{
23 struct gpio_desc
*sdmode
;
24 unsigned int sdmode_delay
;
27 static int max98357a_daiops_trigger(struct snd_pcm_substream
*substream
,
28 int cmd
, struct snd_soc_dai
*dai
)
30 struct max98357a_priv
*max98357a
= snd_soc_dai_get_drvdata(dai
);
32 if (!max98357a
->sdmode
)
36 case SNDRV_PCM_TRIGGER_START
:
37 case SNDRV_PCM_TRIGGER_RESUME
:
38 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
39 mdelay(max98357a
->sdmode_delay
);
40 gpiod_set_value(max98357a
->sdmode
, 1);
42 case SNDRV_PCM_TRIGGER_STOP
:
43 case SNDRV_PCM_TRIGGER_SUSPEND
:
44 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
45 gpiod_set_value(max98357a
->sdmode
, 0);
52 static const struct snd_soc_dapm_widget max98357a_dapm_widgets
[] = {
53 SND_SOC_DAPM_OUTPUT("Speaker"),
56 static const struct snd_soc_dapm_route max98357a_dapm_routes
[] = {
57 {"Speaker", NULL
, "HiFi Playback"},
60 static const struct snd_soc_component_driver max98357a_component_driver
= {
61 .dapm_widgets
= max98357a_dapm_widgets
,
62 .num_dapm_widgets
= ARRAY_SIZE(max98357a_dapm_widgets
),
63 .dapm_routes
= max98357a_dapm_routes
,
64 .num_dapm_routes
= ARRAY_SIZE(max98357a_dapm_routes
),
68 .non_legacy_dai_naming
= 1,
71 static const struct snd_soc_dai_ops max98357a_dai_ops
= {
72 .trigger
= max98357a_daiops_trigger
,
75 static struct snd_soc_dai_driver max98357a_dai_driver
= {
78 .stream_name
= "HiFi Playback",
79 .formats
= SNDRV_PCM_FMTBIT_S16
|
80 SNDRV_PCM_FMTBIT_S24
|
82 .rates
= SNDRV_PCM_RATE_8000
|
83 SNDRV_PCM_RATE_16000
|
84 SNDRV_PCM_RATE_32000
|
85 SNDRV_PCM_RATE_44100
|
86 SNDRV_PCM_RATE_48000
|
87 SNDRV_PCM_RATE_88200
|
94 .ops
= &max98357a_dai_ops
,
97 static int max98357a_platform_probe(struct platform_device
*pdev
)
99 struct max98357a_priv
*max98357a
;
102 max98357a
= devm_kzalloc(&pdev
->dev
, sizeof(*max98357a
), GFP_KERNEL
);
106 max98357a
->sdmode
= devm_gpiod_get_optional(&pdev
->dev
,
107 "sdmode", GPIOD_OUT_LOW
);
108 if (IS_ERR(max98357a
->sdmode
))
109 return PTR_ERR(max98357a
->sdmode
);
111 ret
= device_property_read_u32(&pdev
->dev
, "sdmode-delay",
112 &max98357a
->sdmode_delay
);
114 max98357a
->sdmode_delay
= 0;
116 "no optional property 'sdmode-delay' found, "
117 "default: no delay\n");
120 dev_set_drvdata(&pdev
->dev
, max98357a
);
122 return devm_snd_soc_register_component(&pdev
->dev
,
123 &max98357a_component_driver
,
124 &max98357a_dai_driver
, 1);
128 static const struct of_device_id max98357a_device_id
[] = {
129 { .compatible
= "maxim,max98357a" },
132 MODULE_DEVICE_TABLE(of
, max98357a_device_id
);
136 static const struct acpi_device_id max98357a_acpi_match
[] = {
140 MODULE_DEVICE_TABLE(acpi
, max98357a_acpi_match
);
143 static struct platform_driver max98357a_platform_driver
= {
146 .of_match_table
= of_match_ptr(max98357a_device_id
),
147 .acpi_match_table
= ACPI_PTR(max98357a_acpi_match
),
149 .probe
= max98357a_platform_probe
,
151 module_platform_driver(max98357a_platform_driver
);
153 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
154 MODULE_LICENSE("GPL v2");