From 04c9a8eb722ff6ebafd95217bed4faf6193e7e46 Mon Sep 17 00:00:00 2001 From: Okan Sahin Date: Wed, 12 Apr 2023 14:12:44 +0300 Subject: [PATCH] iio: adc: max77541: Add ADI MAX77541 ADC Support The MAX77541 has an 8-bit Successive Approximation Register (SAR) ADC with four multiplexers for supporting the telemetry feature. Signed-off-by: Okan Sahin Reviewed-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20230412111256.40013-4-okan.sahin@analog.com Signed-off-by: Lee Jones --- 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 eb2b09e..08b8f27 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 e07e4a3..eb6e8917 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 0000000..21d024b --- /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 +#include +#include +#include +#include +#include + +#include + +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 "); +MODULE_DESCRIPTION("MAX77541 ADC driver"); +MODULE_LICENSE("GPL"); -- 2.7.4