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Commit 3b7ce997 authored by Ricard Wanderlof's avatar Ricard Wanderlof Committed by Mark Brown
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ASoC: ics43432: Add codec driver for InvenSense ICS-43432 



Add support for the InvenSense ICS-43432 I2S MEMS microphone.

This is a non-software-configurable MEMS microphone with I2S output.

Tested on a setup with a single ICS-43432 (the device itself supports
stereo operation using a hardware pin controlling left vs. right channel
output).

Signed-off-by: default avatarRicard Wanderlof <ricardw@axis.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent bc0195aa

Documentation/devicetree/bindings/sound/ics43432.txt

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Invensense ICS-43432 MEMS microphone with I2S output.



There are no software configuration options for this device, indeed, the only

host connection is the I2S interface. Apart from requirements on clock

frequency (460 kHz to 3.379 MHz according to the data sheet) there must be

64 clock cycles in each stereo output frame; 24 of the 32 available bits

contain audio data. A hardware pin determines if the device outputs data

on the left or right channel of the I2S frame.



Required properties:

  - compatible : Must be "invensense,ics43432"



Example:



	ics43432: ics43432 {

		compatible = "invensense,ics43432";

	};

Documentation/devicetree/bindings/vendor-prefixes.txt

+1 −0
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@@ -110,6 +110,7 @@ ingenic Ingenic Semiconductor 
innolux	Innolux Corporation

intel	Intel Corporation

intercontrol	Inter Control Group

invensense	InvenSense Inc.

isee	ISEE 2007 S.L.

isil	Intersil

karo	Ka-Ro electronics GmbH

sound/soc/codecs/Kconfig

+4 −0
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@@ -62,6 +62,7 @@ config SND_SOC_ALL_CODECS 
	select SND_SOC_BT_SCO

	select SND_SOC_ES8328_SPI if SPI_MASTER

	select SND_SOC_ES8328_I2C if I2C

	select SND_SOC_ICS43432

	select SND_SOC_ISABELLE if I2C

	select SND_SOC_JZ4740_CODEC

	select SND_SOC_LM4857 if I2C
@@ -446,6 +447,9 @@ config SND_SOC_ES8328_SPI 
	tristate

	select SND_SOC_ES8328



config SND_SOC_ICS43432

	tristate



config SND_SOC_ISABELLE

        tristate

sound/soc/codecs/Makefile

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@@ -55,6 +55,7 @@ snd-soc-dmic-objs := dmic.o 
snd-soc-es8328-objs := es8328.o

snd-soc-es8328-i2c-objs := es8328-i2c.o

snd-soc-es8328-spi-objs := es8328-spi.o

snd-soc-ics43432-objs := ics43432.o

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

snd-soc-jz4740-codec-objs := jz4740.o

snd-soc-l3-objs := l3.o
@@ -242,6 +243,7 @@ obj-$(CONFIG_SND_SOC_DMIC) += snd-soc-dmic.o 
obj-$(CONFIG_SND_SOC_ES8328)	+= snd-soc-es8328.o

obj-$(CONFIG_SND_SOC_ES8328_I2C)+= snd-soc-es8328-i2c.o

obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o

obj-$(CONFIG_SND_SOC_ICS43432)	+= snd-soc-ics43432.o

obj-$(CONFIG_SND_SOC_ISABELLE)	+= snd-soc-isabelle.o

obj-$(CONFIG_SND_SOC_JZ4740_CODEC)	+= snd-soc-jz4740-codec.o

obj-$(CONFIG_SND_SOC_L3)	+= snd-soc-l3.o

sound/soc/codecs/ics43432.c

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/*

 * I2S MEMS microphone driver for InvenSense ICS-43432

 *

 * - Non configurable.

 * - I2S interface, 64 BCLs per frame, 32 bits per channel, 24 bit data

 *

 * Copyright (c) 2015 Axis Communications AB

 *

 * Licensed under GPL2.

 */



#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/initval.h>

#include <sound/tlv.h>



#define ICS43432_RATE_MIN 7190 /* Hz, from data sheet */

#define ICS43432_RATE_MAX 52800  /* Hz, from data sheet */



#define ICS43432_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32)



static struct snd_soc_dai_driver ics43432_dai = {

	.name = "ics43432-hifi",

	.capture = {

		.stream_name = "Capture",

		.channels_min = 1,

		.channels_max = 2,

		.rate_min = ICS43432_RATE_MIN,

		.rate_max = ICS43432_RATE_MAX,

		.rates = SNDRV_PCM_RATE_CONTINUOUS,

		.formats = ICS43432_FORMATS,

	},

};



static struct snd_soc_codec_driver ics43432_codec_driver = {

};



static int ics43432_probe(struct platform_device *pdev)

{

	return snd_soc_register_codec(&pdev->dev, &ics43432_codec_driver,

			&ics43432_dai, 1);

}



static int ics43432_remove(struct platform_device *pdev)

{

	snd_soc_unregister_codec(&pdev->dev);

	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id ics43432_ids[] = {

	{ .compatible = "invensense,ics43432", },

	{ }

};

MODULE_DEVICE_TABLE(of, ics43432_dt_ids);

#endif



static struct platform_driver ics43432_driver = {

	.driver = {

		.name = "ics43432",

		.owner = THIS_MODULE,

		.of_match_table = of_match_ptr(ics43432_ids),

	},

	.probe = ics43432_probe,

	.remove = ics43432_remove,

};



module_platform_driver(ics43432_driver);



MODULE_DESCRIPTION("ASoC ICS43432 driver");

MODULE_AUTHOR("Ricard Wanderlof <ricardw@axis.com>");

MODULE_LICENSE("GPLv2");