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/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* max98357a.c -- MAX98357A ALSA SoC Codec driver
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/soc-dapm.h>
#define DRV_NAME "max98357a"
static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
gpiod_set_value(sdmode, 1);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
gpiod_set_value(sdmode, 0);
break;
}
return 0;
}
static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_OUTPUT("Speaker"),
};
static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
{"Speaker", NULL, "SDMode"},
};
static int max98357a_codec_probe(struct snd_soc_codec *codec)
{
struct gpio_desc *sdmode;
sdmode = devm_gpiod_get(codec->dev, "sdmode");
if (IS_ERR(sdmode)) {
dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
__func__, PTR_ERR(sdmode));
return PTR_ERR(sdmode);
}
gpiod_direction_output(sdmode, 0);
snd_soc_codec_set_drvdata(codec, sdmode);
return 0;
}
static struct snd_soc_codec_driver max98357a_codec_driver = {
.probe = max98357a_codec_probe,
.dapm_widgets = max98357a_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets),
.dapm_routes = max98357a_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes),
};
static struct snd_soc_dai_ops max98357a_dai_ops = {
.trigger = max98357a_daiops_trigger,
};
static struct snd_soc_dai_driver max98357a_dai_driver = {
.name = DRV_NAME,
.playback = {
.stream_name = DRV_NAME "-playback",
.formats = SNDRV_PCM_FMTBIT_S16 |
SNDRV_PCM_FMTBIT_S24 |
SNDRV_PCM_FMTBIT_S32,
.rates = SNDRV_PCM_RATE_8000 |
SNDRV_PCM_RATE_16000 |
SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_96000,
.rate_min = 8000,
.rate_max = 96000,
.channels_min = 1,
.channels_max = 2,
},
.ops = &max98357a_dai_ops,
};
static int max98357a_platform_probe(struct platform_device *pdev)
{
int ret;
ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
&max98357a_dai_driver, 1);
if (ret)
dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
__func__, ret);
return ret;
}
static int max98357a_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id max98357a_device_id[] = {
{ .compatible = "maxim," DRV_NAME, },
{}
};
MODULE_DEVICE_TABLE(of, max98357a_device_id);
#endif
static struct platform_driver max98357a_platform_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(max98357a_device_id),
},
.probe = max98357a_platform_probe,
.remove = max98357a_platform_remove,
};
module_platform_driver(max98357a_platform_driver);
MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);
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