ASoC: ssm2305: Add amplifier driver (74f24d87) · Commits · 戴 / test

Documentation/devicetree/bindings/sound/adi,ssm2305.txt

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		Analog Devices SSM2305 Speaker Amplifier
		========================================

		Required properties:
		- compatible : "adi,ssm2305"
		- shutdown-gpios : The gpio connected to the shutdown pin.
		The gpio signal is ACTIVE_LOW.

		Example:

		ssm2305: analog-amplifier {
		compatible = "adi,ssm2305";
		shutdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>;
		};

sound/soc/codecs/Kconfig

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		@@ -145,6 +145,7 @@ config SND_SOC_ALL_CODECS
		select SND_SOC_SI476X if MFD_SI476X_CORE
		select SND_SOC_SIRF_AUDIO_CODEC
		select SND_SOC_SPDIF
		select SND_SOC_SSM2305
		select SND_SOC_SSM2518 if I2C
		select SND_SOC_SSM2602_SPI if SPI_MASTER
		select SND_SOC_SSM2602_I2C if I2C
		@@ -896,6 +897,12 @@ config SND_SOC_SIRF_AUDIO_CODEC
		config SND_SOC_SPDIF
		tristate "S/PDIF CODEC"

		config SND_SOC_SSM2305
		tristate "Analog Devices SSM2305 Class-D Amplifier"
		help
		Enable support for Analog Devices SSM2305 filterless
		high-efficiency mono Class-D audio power amplifiers.

		config SND_SOC_SSM2518
		tristate

sound/soc/codecs/Makefile

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		@@ -156,6 +156,7 @@ snd-soc-si476x-objs := si476x.o
		snd-soc-sirf-audio-codec-objs := sirf-audio-codec.o
		snd-soc-spdif-tx-objs := spdif_transmitter.o
		snd-soc-spdif-rx-objs := spdif_receiver.o
		snd-soc-ssm2305-objs := ssm2305.o
		snd-soc-ssm2518-objs := ssm2518.o
		snd-soc-ssm2602-objs := ssm2602.o
		snd-soc-ssm2602-spi-objs := ssm2602-spi.o
		@@ -410,6 +411,7 @@ obj-$(CONFIG_SND_SOC_SIGMADSP_REGMAP) += snd-soc-sigmadsp-regmap.o
		obj-$(CONFIG_SND_SOC_SI476X) += snd-soc-si476x.o
		obj-$(CONFIG_SND_SOC_SPDIF) += snd-soc-spdif-rx.o snd-soc-spdif-tx.o
		obj-$(CONFIG_SND_SOC_SIRF_AUDIO_CODEC) += sirf-audio-codec.o
		obj-$(CONFIG_SND_SOC_SSM2305) += snd-soc-ssm2305.o
		obj-$(CONFIG_SND_SOC_SSM2518) += snd-soc-ssm2518.o
		obj-$(CONFIG_SND_SOC_SSM2602) += snd-soc-ssm2602.o
		obj-$(CONFIG_SND_SOC_SSM2602_SPI) += snd-soc-ssm2602-spi.o

sound/soc/codecs/ssm2305.c

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Analog Devices SSM2305 Amplifier Driver
		*
		* Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
		*/

		#include <linux/gpio/consumer.h>
		#include <linux/module.h>
		#include <sound/soc.h>

		#define DRV_NAME "ssm2305"

		struct ssm2305 {
		/* shutdown gpio */
		struct gpio_desc *gpiod_shutdown;
		};

		static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
		struct snd_kcontrol *kctrl, int event)
		{
		struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
		struct ssm2305 *data = snd_soc_component_get_drvdata(c);

		gpiod_set_value_cansleep(data->gpiod_shutdown,
		SND_SOC_DAPM_EVENT_ON(event));

		return 0;
		}

		static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
		/* Stereo input/output */
		SND_SOC_DAPM_INPUT("L_IN"),
		SND_SOC_DAPM_INPUT("R_IN"),
		SND_SOC_DAPM_OUTPUT("L_OUT"),
		SND_SOC_DAPM_OUTPUT("R_OUT"),

		SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
		SND_SOC_DAPM_PRE_PMU \| SND_SOC_DAPM_POST_PMD),
		};

		static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
		{ "L_OUT", NULL, "L_IN" },
		{ "R_OUT", NULL, "R_IN" },
		{ "L_IN", NULL, "Power" },
		{ "R_IN", NULL, "Power" },
		};

		static const struct snd_soc_component_driver ssm2305_component_driver = {
		.dapm_widgets = ssm2305_dapm_widgets,
		.num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),
		.dapm_routes = ssm2305_dapm_routes,
		.num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),
		};

		static int ssm2305_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct ssm2305 *priv;
		int err;

		/* Allocate the private data */
		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		platform_set_drvdata(pdev, priv);

		/* Get shutdown gpio */
		priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
		GPIOD_OUT_LOW);
		if (IS_ERR(priv->gpiod_shutdown)) {
		err = PTR_ERR(priv->gpiod_shutdown);
		if (err != -EPROBE_DEFER)
		dev_err(dev, "Failed to get 'shutdown' gpio: %d\n",
		err);
		return err;
		}

		return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
		NULL, 0);
		}

		#ifdef CONFIG_OF
		static const struct of_device_id ssm2305_of_match[] = {
		{ .compatible = "adi,ssm2305", },
		{ }
		};
		MODULE_DEVICE_TABLE(of, ssm2305_of_match);
		#endif

		static struct platform_driver ssm2305_driver = {
		.driver = {
		.name = DRV_NAME,
		.of_match_table = of_match_ptr(ssm2305_of_match),
		},
		.probe = ssm2305_probe,
		};

		module_platform_driver(ssm2305_driver);

		MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
		MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
		MODULE_LICENSE("GPL v2");

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