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Date: Wed, 12 Apr 2023 16:41:29 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Okan Sahin <okan.sahin@...log.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Cosmin Tanislav <demonsingur@...il.com>,
Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ramona Bolboaca <ramona.bolboaca@...log.com>,
Caleb Connolly <caleb.connolly@...aro.org>,
ChiYuan Huang <cy_huang@...htek.com>,
William Breathitt Gray <william.gray@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Hugo Villeneuve <hvilleneuve@...onoff.com>,
Haibo Chen <haibo.chen@....com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v7 3/5] iio: adc: max77541: Add ADI MAX77541 ADC Support
On Wed, Apr 12, 2023 at 02:12:44PM +0300, Okan Sahin wrote:
> The MAX77541 has an 8-bit Successive Approximation Register (SAR) ADC
> with four multiplexers for supporting the telemetry feature.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Okan Sahin <okan.sahin@...log.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
> drivers/iio/adc/Kconfig | 11 ++
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/max77541-adc.c | 194 +++++++++++++++++++++++++++++++++
> 3 files changed, 206 insertions(+)
> create mode 100644 drivers/iio/adc/max77541-adc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 45af2302be53..518e7bd453aa 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -735,6 +735,17 @@ config MAX1363
> To compile this driver as a module, choose M here: the module will be
> called max1363.
>
> +config MAX77541_ADC
> + tristate "Analog Devices MAX77541 ADC driver"
> + depends on MFD_MAX77541
> + help
> + This driver controls a Analog Devices MAX77541 ADC
> + via I2C bus. This device has one adc. Say yes here to build
> + support for Analog Devices MAX77541 ADC interface.
> +
> + To compile this driver as a module, choose M here:
> + the module will be called max77541-adc.
> +
> config MAX9611
> tristate "Maxim max9611/max9612 ADC driver"
> depends on I2C
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 36c18177322a..f8433b560c3b 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -67,6 +67,7 @@ obj-$(CONFIG_MAX11205) += max11205.o
> obj-$(CONFIG_MAX11410) += max11410.o
> obj-$(CONFIG_MAX1241) += max1241.o
> obj-$(CONFIG_MAX1363) += max1363.o
> +obj-$(CONFIG_MAX77541_ADC) += max77541-adc.o
> obj-$(CONFIG_MAX9611) += max9611.o
> obj-$(CONFIG_MCP320X) += mcp320x.o
> obj-$(CONFIG_MCP3422) += mcp3422.o
> diff --git a/drivers/iio/adc/max77541-adc.c b/drivers/iio/adc/max77541-adc.c
> new file mode 100644
> index 000000000000..21d024bde16b
> --- /dev/null
> +++ b/drivers/iio/adc/max77541-adc.c
> @@ -0,0 +1,194 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022 Analog Devices, Inc.
> + * ADI MAX77541 ADC Driver with IIO interface
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/iio/iio.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/units.h>
> +
> +#include <linux/mfd/max77541.h>
> +
> +enum max77541_adc_range {
> + LOW_RANGE,
> + MID_RANGE,
> + HIGH_RANGE,
> +};
> +
> +enum max77541_adc_channel {
> + MAX77541_ADC_VSYS_V,
> + MAX77541_ADC_VOUT1_V,
> + MAX77541_ADC_VOUT2_V,
> + MAX77541_ADC_TEMP,
> +};
> +
> +static int max77541_adc_offset(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2)
> +{
> + switch (chan->channel) {
> + case MAX77541_ADC_TEMP:
> + *val = DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS, 1725);
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int max77541_adc_scale(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2)
> +{
> + struct regmap **regmap = iio_priv(indio_dev);
> + unsigned int reg_val;
> + int ret;
> +
> + switch (chan->channel) {
> + case MAX77541_ADC_VSYS_V:
> + *val = 25;
> + return IIO_VAL_INT;
> + case MAX77541_ADC_VOUT1_V:
> + case MAX77541_ADC_VOUT2_V:
> + ret = regmap_read(*regmap, MAX77541_REG_M2_CFG1, ®_val);
> + if (ret)
> + return ret;
> +
> + reg_val = FIELD_GET(MAX77541_BITS_MX_CFG1_RNG, reg_val);
> + switch (reg_val) {
> + case LOW_RANGE:
> + *val = 6;
> + *val2 = 250000;
> + break;
> + case MID_RANGE:
> + *val = 12;
> + *val2 = 500000;
> + break;
> + case HIGH_RANGE:
> + *val = 25;
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> + case MAX77541_ADC_TEMP:
> + *val = 1725;
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int max77541_adc_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val)
> +{
> + struct regmap **regmap = iio_priv(indio_dev);
> + int ret;
> +
> + ret = regmap_read(*regmap, chan->address, val);
> + if (ret)
> + return ret;
> +
> + return IIO_VAL_INT;
> +}
> +
> +#define MAX77541_ADC_CHANNEL_V(_channel, _name, _type, _reg) \
> + { \
> + .type = _type, \
> + .indexed = 1, \
> + .channel = _channel, \
> + .address = _reg, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .datasheet_name = _name, \
> + }
> +
> +#define MAX77541_ADC_CHANNEL_TEMP(_channel, _name, _type, _reg) \
> + { \
> + .type = _type, \
> + .indexed = 1, \
> + .channel = _channel, \
> + .address = _reg, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE) |\
> + BIT(IIO_CHAN_INFO_OFFSET),\
> + .datasheet_name = _name, \
> + }
> +
> +static const struct iio_chan_spec max77541_adc_channels[] = {
> + MAX77541_ADC_CHANNEL_V(MAX77541_ADC_VSYS_V, "vsys_v", IIO_VOLTAGE,
> + MAX77541_REG_ADC_DATA_CH1),
> + MAX77541_ADC_CHANNEL_V(MAX77541_ADC_VOUT1_V, "vout1_v", IIO_VOLTAGE,
> + MAX77541_REG_ADC_DATA_CH2),
> + MAX77541_ADC_CHANNEL_V(MAX77541_ADC_VOUT2_V, "vout2_v", IIO_VOLTAGE,
> + MAX77541_REG_ADC_DATA_CH3),
> + MAX77541_ADC_CHANNEL_TEMP(MAX77541_ADC_TEMP, "temp", IIO_TEMP,
> + MAX77541_REG_ADC_DATA_CH6),
> +};
> +
> +static int max77541_adc_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + switch (mask) {
> + case IIO_CHAN_INFO_OFFSET:
> + return max77541_adc_offset(indio_dev, chan, val, val2);
> + case IIO_CHAN_INFO_SCALE:
> + return max77541_adc_scale(indio_dev, chan, val, val2);
> + case IIO_CHAN_INFO_RAW:
> + return max77541_adc_raw(indio_dev, chan, val);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info max77541_adc_info = {
> + .read_raw = max77541_adc_read_raw,
> +};
> +
> +static int max77541_adc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct iio_dev *indio_dev;
> + struct regmap **regmap;
> +
> + indio_dev = devm_iio_device_alloc(dev, sizeof(*regmap));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + regmap = iio_priv(indio_dev);
> +
> + *regmap = dev_get_regmap(dev->parent, NULL);
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + indio_dev->name = "max77541";
> + indio_dev->info = &max77541_adc_info;
> + indio_dev->channels = max77541_adc_channels;
> + indio_dev->num_channels = ARRAY_SIZE(max77541_adc_channels);
> +
> + return devm_iio_device_register(dev, indio_dev);
> +}
> +
> +static const struct platform_device_id max77541_adc_platform_id[] = {
> + { "max77541-adc" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, max77541_adc_platform_id);
> +
> +static struct platform_driver max77541_adc_driver = {
> + .driver = {
> + .name = "max77541-adc",
> + },
> + .probe = max77541_adc_probe,
> + .id_table = max77541_adc_platform_id,
> +};
> +module_platform_driver(max77541_adc_driver);
> +
> +MODULE_AUTHOR("Okan Sahin <Okan.Sahin@...log.com>");
> +MODULE_DESCRIPTION("MAX77541 ADC driver");
> +MODULE_LICENSE("GPL");
> --
> 2.30.2
>
--
With Best Regards,
Andy Shevchenko
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