ASoC: codecs: Add Awinic AW8738 audio amplifier driver (fc14fac2) · Commits · EulixOS / Software / Kernel

Documentation/devicetree/bindings/sound/awinic,aw8738.yaml

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		# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
		%YAML 1.2
		---
		$id: http://devicetree.org/schemas/sound/awinic,aw8738.yaml#
		$schema: http://devicetree.org/meta-schemas/core.yaml#

		title: Awinic AW8738 Audio Amplifier

		maintainers:
		- Stephan Gerhold <stephan@gerhold.net>

		description:
		The Awinic AW8738 is a simple audio amplifier with different operation modes
		(set using one-wire pulse control). The mode configures the speaker-guard
		function (primarily the power limit for the amplifier).

		allOf:
		- $ref: name-prefix.yaml#

		properties:
		compatible:
		const: awinic,aw8738

		mode-gpios:
		description:
		GPIO used for one-wire pulse control. The pin is typically called SHDN
		(active-low), but this is misleading since it is actually more than
		just a simple shutdown/enable control.
		maxItems: 1

		awinic,mode:
		description: Operation mode (number of pulses for one-wire pulse control)
		$ref: /schemas/types.yaml#/definitions/uint32
		minimum: 1
		maximum: 7

		sound-name-prefix: true

		required:
		- compatible
		- mode-gpios
		- awinic,mode

		additionalProperties: false

		examples:
		- \|
		#include <dt-bindings/gpio/gpio.h>
		audio-amplifier {
		compatible = "awinic,aw8738";
		mode-gpios = <&msmgpio 114 GPIO_ACTIVE_HIGH>;
		awinic,mode = <5>;
		sound-name-prefix = "Speaker Amp";
		};

sound/soc/codecs/Kconfig

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		@@ -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

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		@@ -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

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		// 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");