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Unverified Commit 8a5f0b6f authored by Arnaud Pouliquen's avatar Arnaud Pouliquen Committed by Mark Brown
Browse files

IIO: ADC: add sigma delta modulator support 



Add generic driver to support sigma delta modulators.
Typically, this device is hardware connected to
an IIO device in charge of the conversion. Devices are
bonded through the hardware consumer API.

Signed-off-by: default avatarArnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent af111437

drivers/iio/adc/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -629,6 +629,18 @@ config SPEAR_ADC 
	  To compile this driver as a module, choose M here: the

	  module will be called spear_adc.



config SD_ADC_MODULATOR

	tristate "Generic sigma delta modulator"

	depends on OF

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Select this option to enables sigma delta modulator. This driver can

	  support generic sigma delta modulators.



	  This driver can also be built as a module.  If so, the module

	  will be called sd_adc_modulator.



config STM32_ADC_CORE

	tristate "STMicroelectronics STM32 adc core"

	depends on ARCH_STM32 || COMPILE_TEST

drivers/iio/adc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -82,3 +82,4 @@ obj-$(CONFIG_VF610_ADC) += vf610_adc.o 
obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o

xilinx-xadc-y := xilinx-xadc-core.o xilinx-xadc-events.o

obj-$(CONFIG_XILINX_XADC) += xilinx-xadc.o

obj-$(CONFIG_SD_ADC_MODULATOR) += sd_adc_modulator.o

drivers/iio/adc/sd_adc_modulator.c

0 → 100644
+68 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Generic sigma delta modulator driver

 *

 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved

 * Author: Arnaud Pouliquen <arnaud.pouliquen@st.com>.

 */



#include <linux/iio/iio.h>

#include <linux/iio/triggered_buffer.h>

#include <linux/module.h>

#include <linux/of_device.h>



static const struct iio_info iio_sd_mod_iio_info;



static const struct iio_chan_spec iio_sd_mod_ch = {

	.type = IIO_VOLTAGE,

	.indexed = 1,

	.scan_type = {

		.sign = 'u',

		.realbits = 1,

		.shift = 0,

	},

};



static int iio_sd_mod_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct iio_dev *iio;



	iio = devm_iio_device_alloc(dev, 0);

	if (!iio)

		return -ENOMEM;



	iio->dev.parent = dev;

	iio->dev.of_node = dev->of_node;

	iio->name = dev_name(dev);

	iio->info = &iio_sd_mod_iio_info;

	iio->modes = INDIO_BUFFER_HARDWARE;



	iio->num_channels = 1;

	iio->channels = &iio_sd_mod_ch;



	platform_set_drvdata(pdev, iio);



	return devm_iio_device_register(&pdev->dev, iio);

}



static const struct of_device_id sd_adc_of_match[] = {

	{ .compatible = "sd-modulator" },

	{ .compatible = "ads1201" },

	{ }

};

MODULE_DEVICE_TABLE(of, sd_adc_of_match);



static struct platform_driver iio_sd_mod_adc = {

	.driver = {

		.name = "iio_sd_adc_mod",

		.of_match_table = of_match_ptr(sd_adc_of_match),

	},

	.probe = iio_sd_mod_probe,

};



module_platform_driver(iio_sd_mod_adc);



MODULE_DESCRIPTION("Basic sigma delta modulator");

MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");

MODULE_LICENSE("GPL v2");