1 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * max98357a.c -- MAX98357A ALSA SoC Codec driver
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/kernel.h>
20 #include <linux/mod_devicetable.h>
21 #include <linux/module.h>
23 #include <linux/platform_device.h>
24 #include <sound/pcm.h>
25 #include <sound/soc.h>
26 #include <sound/soc-dai.h>
27 #include <sound/soc-dapm.h>
29 #define DRV_NAME "max98357a"
31 static int max98357a_daiops_trigger(struct snd_pcm_substream
*substream
,
32 int cmd
, struct snd_soc_dai
*dai
)
34 struct gpio_desc
*sdmode
= snd_soc_dai_get_drvdata(dai
);
37 case SNDRV_PCM_TRIGGER_START
:
38 case SNDRV_PCM_TRIGGER_RESUME
:
39 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
40 gpiod_set_value(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(sdmode
, 0);
52 static const struct snd_soc_dapm_widget max98357a_dapm_widgets
[] = {
53 SND_SOC_DAPM_DAC("SDMode", NULL
, SND_SOC_NOPM
, 0, 0),
54 SND_SOC_DAPM_OUTPUT("Speaker"),
57 static const struct snd_soc_dapm_route max98357a_dapm_routes
[] = {
58 {"Speaker", NULL
, "SDMode"},
61 static int max98357a_codec_probe(struct snd_soc_codec
*codec
)
63 struct gpio_desc
*sdmode
;
65 sdmode
= devm_gpiod_get(codec
->dev
, "sdmode");
67 dev_err(codec
->dev
, "%s() unable to get sdmode GPIO: %ld\n",
68 __func__
, PTR_ERR(sdmode
));
69 return PTR_ERR(sdmode
);
71 gpiod_direction_output(sdmode
, 0);
72 snd_soc_codec_set_drvdata(codec
, sdmode
);
77 static struct snd_soc_codec_driver max98357a_codec_driver
= {
78 .probe
= max98357a_codec_probe
,
79 .dapm_widgets
= max98357a_dapm_widgets
,
80 .num_dapm_widgets
= ARRAY_SIZE(max98357a_dapm_widgets
),
81 .dapm_routes
= max98357a_dapm_routes
,
82 .num_dapm_routes
= ARRAY_SIZE(max98357a_dapm_routes
),
85 static struct snd_soc_dai_ops max98357a_dai_ops
= {
86 .trigger
= max98357a_daiops_trigger
,
89 static struct snd_soc_dai_driver max98357a_dai_driver
= {
92 .stream_name
= DRV_NAME
"-playback",
93 .formats
= SNDRV_PCM_FMTBIT_S16
|
94 SNDRV_PCM_FMTBIT_S24
|
96 .rates
= SNDRV_PCM_RATE_8000
|
97 SNDRV_PCM_RATE_16000
|
98 SNDRV_PCM_RATE_48000
|
105 .ops
= &max98357a_dai_ops
,
108 static int max98357a_platform_probe(struct platform_device
*pdev
)
112 ret
= snd_soc_register_codec(&pdev
->dev
, &max98357a_codec_driver
,
113 &max98357a_dai_driver
, 1);
115 dev_err(&pdev
->dev
, "%s() error registering codec driver: %d\n",
121 static int max98357a_platform_remove(struct platform_device
*pdev
)
123 snd_soc_unregister_codec(&pdev
->dev
);
129 static const struct of_device_id max98357a_device_id
[] = {
130 { .compatible
= "maxim," DRV_NAME
, },
133 MODULE_DEVICE_TABLE(of
, max98357a_device_id
);
136 static struct platform_driver max98357a_platform_driver
= {
139 .of_match_table
= of_match_ptr(max98357a_device_id
),
141 .probe
= max98357a_platform_probe
,
142 .remove
= max98357a_platform_remove
,
144 module_platform_driver(max98357a_platform_driver
);
146 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
147 MODULE_LICENSE("GPL v2");
148 MODULE_ALIAS("platform:" DRV_NAME
);