ASoC: Add codec driver for AK5386 (cc289be8) · Commits · e / devices / android_kernel_fairphone_FP3

Documentation/devicetree/bindings/sound/ak5386.txt

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		AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC

		This device has no control interface.

		Required properties:

		- compatible : "asahi-kasei,ak5386"

		Optional properties:

		- reset-gpio : a GPIO spec for the reset/power down pin.
		If specified, it will be deasserted at probe time.

		Example:

		spdif: ak5386@0 {
		compatible = "asahi-kasei,ak5386";
		reset-gpio = <&gpio0 23>;
		};

sound/soc/codecs/Kconfig

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		@@ -26,6 +26,7 @@ config SND_SOC_ALL_CODECS
		select SND_SOC_AK4641 if I2C
		select SND_SOC_AK4642 if I2C
		select SND_SOC_AK4671 if I2C
		select SND_SOC_AK5386
		select SND_SOC_ALC5623 if I2C
		select SND_SOC_ALC5632 if I2C
		select SND_SOC_CQ0093VC if MFD_DAVINCI_VOICECODEC
		@@ -203,6 +204,9 @@ config SND_SOC_AK4642
		config SND_SOC_AK4671
		tristate

		config SND_SOC_AK5386
		tristate

		config SND_SOC_ALC5623
		tristate
		config SND_SOC_ALC5632

sound/soc/codecs/Makefile

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		@@ -14,6 +14,7 @@ snd-soc-ak4535-objs := ak4535.o
		snd-soc-ak4641-objs := ak4641.o
		snd-soc-ak4642-objs := ak4642.o
		snd-soc-ak4671-objs := ak4671.o
		snd-soc-ak5386-objs := ak5386.o
		snd-soc-arizona-objs := arizona.o
		snd-soc-cq93vc-objs := cq93vc.o
		snd-soc-cs42l51-objs := cs42l51.o
		@@ -137,6 +138,7 @@ obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
		obj-$(CONFIG_SND_SOC_AK4641) += snd-soc-ak4641.o
		obj-$(CONFIG_SND_SOC_AK4642) += snd-soc-ak4642.o
		obj-$(CONFIG_SND_SOC_AK4671) += snd-soc-ak4671.o
		obj-$(CONFIG_SND_SOC_AK5386) += snd-soc-ak5386.o
		obj-$(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

sound/soc/codecs/ak5386.c

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		/*
		* ALSA SoC driver for
		* Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
		*
		* (c) 2013 Daniel Mack <zonque@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/of.h>
		#include <linux/of_gpio.h>
		#include <linux/of_device.h>
		#include <sound/soc.h>
		#include <sound/pcm.h>
		#include <sound/initval.h>

		struct ak5386_priv {
		int reset_gpio;
		};

		static struct snd_soc_codec_driver soc_codec_ak5386;

		static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int format)
		{
		struct snd_soc_codec *codec = codec_dai->codec;

		format &= SND_SOC_DAIFMT_FORMAT_MASK;
		if (format != SND_SOC_DAIFMT_LEFT_J &&
		format != SND_SOC_DAIFMT_I2S) {
		dev_err(codec->dev, "Invalid DAI format\n");
		return -EINVAL;
		}

		return 0;
		}

		static int ak5386_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
		{
		struct snd_soc_codec *codec = dai->codec;
		struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);

		/*
		* From the datasheet:
		*
		* All external clocks (MCLK, SCLK and LRCK) must be present unless
		* PDN pin = “L”. If these clocks are not provided, the AK5386 may
		* draw excess current due to its use of internal dynamically
		* refreshed logic. If the external clocks are not present, place
		* the AK5386 in power-down mode (PDN pin = “L”).
		*/

		if (gpio_is_valid(priv->reset_gpio))
		gpio_set_value(priv->reset_gpio, 1);

		return 0;
		}

		static int ak5386_hw_free(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
		{
		struct snd_soc_codec *codec = dai->codec;
		struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);

		if (gpio_is_valid(priv->reset_gpio))
		gpio_set_value(priv->reset_gpio, 0);

		return 0;
		}

		static const struct snd_soc_dai_ops ak5386_dai_ops = {
		.set_fmt = ak5386_set_dai_fmt,
		.hw_params = ak5386_hw_params,
		.hw_free = ak5386_hw_free,
		};

		static struct snd_soc_dai_driver ak5386_dai = {
		.name = "ak5386-hifi",
		.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_192000,
		.formats = SNDRV_PCM_FMTBIT_S8 \|
		SNDRV_PCM_FMTBIT_S16_LE \|
		SNDRV_PCM_FMTBIT_S24_LE \|
		SNDRV_PCM_FMTBIT_S24_3LE,
		},
		.ops = &ak5386_dai_ops,
		};

		#ifdef CONFIG_OF
		static const struct of_device_id ak5386_dt_ids[] = {
		{ .compatible = "asahi-kasei,ak5386", },
		{ }
		};
		MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
		#endif

		static int ak5386_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct ak5386_priv *priv;

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		priv->reset_gpio = -EINVAL;
		dev_set_drvdata(dev, priv);

		if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
		priv->reset_gpio = of_get_named_gpio(dev->of_node,
		"reset-gpio", 0);

		if (gpio_is_valid(priv->reset_gpio))
		if (devm_gpio_request_one(dev, priv->reset_gpio,
		GPIOF_OUT_INIT_LOW,
		"AK5386 Reset"))
		priv->reset_gpio = -EINVAL;

		return snd_soc_register_codec(dev, &soc_codec_ak5386,
		&ak5386_dai, 1);
		}

		static int ak5386_remove(struct platform_device *pdev)
		{
		snd_soc_unregister_codec(&pdev->dev);
		return 0;
		}

		static struct platform_driver ak5386_driver = {
		.probe = ak5386_probe,
		.remove = ak5386_remove,
		.driver = {
		.name = "ak5386",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(ak5386_dt_ids),
		},
		};

		module_platform_driver(ak5386_driver);

		MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
		MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
		MODULE_LICENSE("GPL");