Unverified Commit 4d1a9952 authored by David Lin's avatar David Lin Committed by Mark Brown
Browse files

ASoC: nau8315: add codec driver 



Add codec driver for Nuvoton NAU8315.

Signed-off-by: default avatarDavid Lin <CTLIN0@nuvoton.com>
Reviewed-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20201102023212.594137-1-CTLIN0@nuvoton.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 354e592a

Documentation/devicetree/bindings/sound/nau8315.txt

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Nuvoton NAU8315 Mono Class-D Amplifier



Required properties:

- compatible   : "nuvoton,nau8315"



Optional properties:

- enable-gpios : GPIO specifier for the chip's device enable input(EN) pin.

        If this option is not specified then driver does not manage

        the pin state (e.g. chip is always on).



Example:



#include <dt-bindings/gpio/gpio.h>



nau8315 {

	compatible = "nuvoton,nau8315";

	enable-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;

};

sound/soc/codecs/Kconfig

+5 −0
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@@ -130,6 +130,7 @@ config SND_SOC_ALL_CODECS 
	imply SND_SOC_MT6358

	imply SND_SOC_MT6359

	imply SND_SOC_MT6660

	imply SND_SOC_NAU8315

	imply SND_SOC_NAU8540

	imply SND_SOC_NAU8810

	imply SND_SOC_NAU8822
@@ -1760,6 +1761,10 @@ config SND_SOC_MT6660 
	  Select N if you don't have MT6660 on board.

	  Select M to build this as module.



config SND_SOC_NAU8315

	tristate "Nuvoton Technology Corporation NAU8315 CODEC"

	depends on GPIOLIB



config SND_SOC_NAU8540

       tristate "Nuvoton Technology Corporation NAU85L40 CODEC"

       depends on I2C

sound/soc/codecs/Makefile

+2 −0
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@@ -129,6 +129,7 @@ snd-soc-mt6351-objs := mt6351.o 
snd-soc-mt6358-objs := mt6358.o

snd-soc-mt6359-objs := mt6359.o

snd-soc-mt6660-objs := mt6660.o

snd-soc-nau8315-objs := nau8315.o

snd-soc-nau8540-objs := nau8540.o

snd-soc-nau8810-objs := nau8810.o

snd-soc-nau8822-objs := nau8822.o
@@ -438,6 +439,7 @@ obj-$(CONFIG_SND_SOC_MT6351) += snd-soc-mt6351.o 
obj-$(CONFIG_SND_SOC_MT6358)	+= snd-soc-mt6358.o

obj-$(CONFIG_SND_SOC_MT6359)	+= snd-soc-mt6359.o

obj-$(CONFIG_SND_SOC_MT6660)	+= snd-soc-mt6660.o

obj-$(CONFIG_SND_SOC_NAU8315)   += snd-soc-nau8315.o

obj-$(CONFIG_SND_SOC_NAU8540)   += snd-soc-nau8540.o

obj-$(CONFIG_SND_SOC_NAU8810)   += snd-soc-nau8810.o

obj-$(CONFIG_SND_SOC_NAU8822)   += snd-soc-nau8822.o

sound/soc/codecs/nau8315.c

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// SPDX-License-Identifier: GPL-2.0-only

//

// nau8315.c  --  NAU8315 ALSA SoC Audio Amplifier Driver

//

// Copyright 2020 Nuvoton Technology Crop.

//

// Author: David Lin <ctlin0@nuvoton.com>

//

// Based on MAX98357A.c



#include <linux/acpi.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/kernel.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>



struct nau8315_priv {

	struct gpio_desc *enable;

	int enpin_switch;

};



static int nau8315_daiops_trigger(struct snd_pcm_substream *substream,

		int cmd, struct snd_soc_dai *dai)

{

	struct snd_soc_component *component = dai->component;

	struct nau8315_priv *nau8315 =

		snd_soc_component_get_drvdata(component);



	if (!nau8315->enable)

		return 0;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		if (nau8315->enpin_switch) {

			gpiod_set_value(nau8315->enable, 1);

			dev_dbg(component->dev, "set enable to 1");

		}

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		gpiod_set_value(nau8315->enable, 0);

		dev_dbg(component->dev, "set enable to 0");

		break;

	}



	return 0;

}



static int nau8315_enpin_event(struct snd_soc_dapm_widget *w,

		struct snd_kcontrol *kcontrol, int event)

{

	struct snd_soc_component *component =

		snd_soc_dapm_to_component(w->dapm);

	struct nau8315_priv *nau8315 =

		snd_soc_component_get_drvdata(component);



	if (event & SND_SOC_DAPM_POST_PMU)

		nau8315->enpin_switch = 1;

	else if (event & SND_SOC_DAPM_POST_PMD)

		nau8315->enpin_switch = 0;



	return 0;

}



static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = {

	SND_SOC_DAPM_OUTPUT("Speaker"),

	SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0,

			nau8315_enpin_event,

			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),

};



static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {

	{"EN_Pin", NULL, "HiFi Playback"},

	{"Speaker", NULL, "EN_Pin"},

};



static const struct snd_soc_component_driver nau8315_component_driver = {

	.dapm_widgets		= nau8315_dapm_widgets,

	.num_dapm_widgets	= ARRAY_SIZE(nau8315_dapm_widgets),

	.dapm_routes		= nau8315_dapm_routes,

	.num_dapm_routes	= ARRAY_SIZE(nau8315_dapm_routes),

	.idle_bias_on		= 1,

	.use_pmdown_time	= 1,

	.endianness		= 1,

	.non_legacy_dai_naming	= 1,

};



static const struct snd_soc_dai_ops nau8315_dai_ops = {

	.trigger	= nau8315_daiops_trigger,

};



#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000

#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)



static struct snd_soc_dai_driver nau8315_dai_driver = {

	.name = "nau8315-hifi",

	.playback = {

		.stream_name	= "HiFi Playback",

		.formats	= NAU8315_FORMATS,

		.rates		= NAU8315_RATES,

		.channels_min	= 1,

		.channels_max	= 2,

	},

	.ops    = &nau8315_dai_ops,

};



static int nau8315_platform_probe(struct platform_device *pdev)

{

	struct nau8315_priv *nau8315;



	nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);

	if (!nau8315)

		return -ENOMEM;



	nau8315->enable = devm_gpiod_get_optional(&pdev->dev,

				"enable", GPIOD_OUT_LOW);

	if (IS_ERR(nau8315->enable))

		return PTR_ERR(nau8315->enable);



	dev_set_drvdata(&pdev->dev, nau8315);



	return devm_snd_soc_register_component(&pdev->dev,

			&nau8315_component_driver,

			&nau8315_dai_driver, 1);

}



#ifdef CONFIG_OF

static const struct of_device_id nau8315_device_id[] = {

	{ .compatible = "nuvoton,nau8315" },

	{}

};

MODULE_DEVICE_TABLE(of, nau8315_device_id);

#endif



#ifdef CONFIG_ACPI

static const struct acpi_device_id nau8315_acpi_match[] = {

	{ "NVTN2010", 0 },

	{},

};

MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);

#endif



static struct platform_driver nau8315_platform_driver = {

	.driver = {

		.name = "nau8315",

		.of_match_table = of_match_ptr(nau8315_device_id),

		.acpi_match_table = ACPI_PTR(nau8315_acpi_match),

	},

	.probe	= nau8315_platform_probe,

};

module_platform_driver(nau8315_platform_driver);



MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");

MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");

MODULE_LICENSE("GPL v2");