Unverified Commit 6b4528b5 authored by Jonathan Albrieux's avatar Jonathan Albrieux Committed by Mark Brown
Browse files

ASoC: codecs: Add Awinic AW8738 audio amplifier driver 



The Awinic AW8738 is a simple audio amplifier using a single GPIO.
The main difference to simple-amplifier is that there is a "one-wire
pulse control" that allows configuring the amplifier to one of a few
pre-defined modes. This can be used to configure the speaker-guard
function (primarily the power limit for the amplifier).

Add a simple driver that allows setting it up in the device tree
with a specified mode number.

Signed-off-by: default avatarJonathan Albrieux <jonathan.albrieux@gmail.com>
Co-developed-by: default avatarStephan Gerhold <stephan@gerhold.net>
Signed-off-by: default avatarStephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20220304102452.26856-3-stephan@gerhold.net


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b3284430

sound/soc/codecs/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ config SND_SOC_ALL_CODECS 
	imply SND_SOC_AK5558

	imply SND_SOC_ALC5623

	imply SND_SOC_ALC5632

	imply SND_SOC_AW8738

	imply SND_SOC_BT_SCO

	imply SND_SOC_BD28623

	imply SND_SOC_CQ0093VC
@@ -579,6 +580,15 @@ config SND_SOC_ALC5632 
	tristate

	depends on I2C



config SND_SOC_AW8738

	tristate "Awinic AW8738 Audio Amplifier"

	select GPIOLIB

	help

	  Enable support for the Awinic AW8738 audio amplifier (or similar).

	  The driver supports simple audio amplifiers similar to

	  SND_SOC_SIMPLE_AMPLIFIER, but additionally allows setting the

	  operation mode using the Awinic-specific one-wire pulse control.



config SND_SOC_BD28623

	tristate "ROHM BD28623 CODEC"

	help

sound/soc/codecs/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ snd-soc-ak4671-objs := ak4671.o 
snd-soc-ak5386-objs := ak5386.o

snd-soc-ak5558-objs := ak5558.o

snd-soc-arizona-objs := arizona.o arizona-jack.o

snd-soc-aw8738-objs := aw8738.o

snd-soc-bd28623-objs := bd28623.o

snd-soc-bt-sco-objs := bt-sco.o

snd-soc-cpcap-objs := cpcap.o
@@ -388,6 +389,7 @@ obj-$(CONFIG_SND_SOC_AK5558) += snd-soc-ak5558.o 
obj-$(CONFIG_SND_SOC_ALC5623)    += snd-soc-alc5623.o

obj-$(CONFIG_SND_SOC_ALC5632)	+= snd-soc-alc5632.o

obj-$(CONFIG_SND_SOC_ARIZONA)	+= snd-soc-arizona.o

obj-$(CONFIG_SND_SOC_AW8738)	+= snd-soc-aw8738.o

obj-$(CONFIG_SND_SOC_BD28623)	+= snd-soc-bd28623.o

obj-$(CONFIG_SND_SOC_BT_SCO)	+= snd-soc-bt-sco.o

obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o

sound/soc/codecs/aw8738.c

0 → 100644
+104 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only



#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/regulator/consumer.h>

#include <sound/soc.h>



struct aw8738_priv {

	struct gpio_desc *gpiod_mode;

	unsigned int mode;

};



static int aw8738_drv_event(struct snd_soc_dapm_widget *w,

			    struct snd_kcontrol *kcontrol, int event)

{

	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);

	struct aw8738_priv *aw = snd_soc_component_get_drvdata(c);

	int i;



	switch (event) {

	case SND_SOC_DAPM_POST_PMU:

		for (i = 0; i < aw->mode; i++) {

			gpiod_set_value_cansleep(aw->gpiod_mode, 0);

			udelay(2);

			gpiod_set_value_cansleep(aw->gpiod_mode, 1);

			udelay(2);

		}

		msleep(40);

		break;

	case SND_SOC_DAPM_PRE_PMD:

		gpiod_set_value_cansleep(aw->gpiod_mode, 0);

		usleep_range(1000, 2000);

		break;

	default:

		WARN(1, "Unexpected event");

		return -EINVAL;

	}



	return 0;

}



static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {

	SND_SOC_DAPM_INPUT("IN"),

	SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,

			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),

	SND_SOC_DAPM_OUTPUT("OUT"),

};



static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {

	{ "DRV", NULL, "IN" },

	{ "OUT", NULL, "DRV" },

};



static const struct snd_soc_component_driver aw8738_component_driver = {

	.dapm_widgets = aw8738_dapm_widgets,

	.num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),

	.dapm_routes = aw8738_dapm_routes,

	.num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),

};



static int aw8738_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct aw8738_priv *aw;

	int ret;



	aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);

	if (!aw)

		return -ENOMEM;

	platform_set_drvdata(pdev, aw);



	aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);

	if (IS_ERR(aw->gpiod_mode))

		return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),

				     "Failed to get 'mode' gpio");



	ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);

	if (ret)

		return -EINVAL;



	return devm_snd_soc_register_component(&pdev->dev,

					       &aw8738_component_driver,

					       NULL, 0);

}



#ifdef CONFIG_OF

static const struct of_device_id aw8738_of_match[] = {

	{ .compatible = "awinic,aw8738" },

	{ }

};

MODULE_DEVICE_TABLE(of, aw8738_of_match);

#endif



static struct platform_driver aw8738_driver = {

	.probe	= aw8738_probe,

	.driver = {

		.name = "aw8738",

		.of_match_table = of_match_ptr(aw8738_of_match),

	},

};

module_platform_driver(aw8738_driver);



MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");

MODULE_LICENSE("GPL v2");