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IIO: ADC: add sigma delta modulator support

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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: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnaud Pouliquen 2018-01-10 11:13:08 +01:00 committed by Mark Brown
parent af11143757
commit 8a5f0b6f6c
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GPG Key ID: 24D68B725D5487D0
3 changed files with 81 additions and 0 deletions
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12
drivers/iio/adc/Kconfig
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@ -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

1
drivers/iio/adc/Makefile
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@ -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

68
drivers/iio/adc/sd_adc_modulator.c Normal file
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@ -0,0 +1,68 @@
// 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");