iio: adc: mp2629: Add support for mp2629 ADC driver
Add support for 8-bit resolution ADC readings for input power supply and battery charging measurement. Provides voltage, current readings to mp2629 power supply driver. Signed-off-by: Saravanan Sekar <sravanhome@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Saravanan Sekar
Lee Jones
parent
0608164645
commit
7abd9fb646
@ -692,6 +692,16 @@ config MESON_SARADC
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To compile this driver as a module, choose M here: the
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module will be called meson_saradc.
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config MP2629_ADC
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tristate "Monolithic MP2629 ADC driver"
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depends on MFD_MP2629
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help
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Say yes to have support for battery charger IC MP2629 ADC device
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accessed over I2C.
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This driver provides ADC conversion of system, input power supply
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and battery voltage & current information.
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config NAU7802
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tristate "Nuvoton NAU7802 ADC driver"
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depends on I2C
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@ -65,6 +65,7 @@ obj-$(CONFIG_MCP3911) += mcp3911.o
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obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
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obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
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obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
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obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o
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obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
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obj-$(CONFIG_NAU7802) += nau7802.o
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obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
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208
drivers/iio/adc/mp2629_adc.c
Normal file
208
drivers/iio/adc/mp2629_adc.c
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@ -0,0 +1,208 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MP2629 Driver for ADC
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*
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* Copyright 2020 Monolithic Power Systems, Inc
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*
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* Author: Saravanan Sekar <sravanhome@gmail.com>
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*/
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#include <linux/iio/driver.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/mfd/mp2629.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MP2629_REG_ADC_CTRL 0x03
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#define MP2629_REG_BATT_VOLT 0x0e
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#define MP2629_REG_SYSTEM_VOLT 0x0f
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#define MP2629_REG_INPUT_VOLT 0x11
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#define MP2629_REG_BATT_CURRENT 0x12
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#define MP2629_REG_INPUT_CURRENT 0x13
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#define MP2629_ADC_START BIT(7)
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#define MP2629_ADC_CONTINUOUS BIT(6)
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#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
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#define MP2629_ADC_CHAN(_ch, _type) { \
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.type = _type, \
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.indexed = 1, \
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.datasheet_name = #_ch, \
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.channel = MP2629_ ## _ch, \
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.address = MP2629_REG_ ## _ch, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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}
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struct mp2629_adc {
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struct regmap *regmap;
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struct device *dev;
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};
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static struct iio_chan_spec mp2629_channels[] = {
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MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
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MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
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MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
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MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
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MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
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};
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static struct iio_map mp2629_adc_maps[] = {
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MP2629_MAP(BATT_VOLT, "batt-volt"),
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MP2629_MAP(SYSTEM_VOLT, "system-volt"),
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MP2629_MAP(INPUT_VOLT, "input-volt"),
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MP2629_MAP(BATT_CURRENT, "batt-current"),
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MP2629_MAP(INPUT_CURRENT, "input-current")
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};
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static int mp2629_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct mp2629_adc *info = iio_priv(indio_dev);
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unsigned int rval;
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = regmap_read(info->regmap, chan->address, &rval);
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if (ret)
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return ret;
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if (chan->address == MP2629_INPUT_VOLT)
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rval &= GENMASK(6, 0);
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*val = rval;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->channel) {
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case MP2629_BATT_VOLT:
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case MP2629_SYSTEM_VOLT:
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*val = 20;
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return IIO_VAL_INT;
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case MP2629_INPUT_VOLT:
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*val = 60;
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return IIO_VAL_INT;
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case MP2629_BATT_CURRENT:
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*val = 175;
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*val2 = 10;
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return IIO_VAL_FRACTIONAL;
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case MP2629_INPUT_CURRENT:
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*val = 133;
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*val2 = 10;
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return IIO_VAL_FRACTIONAL;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info mp2629_adc_info = {
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.read_raw = &mp2629_read_raw,
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};
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static int mp2629_adc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
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struct mp2629_adc *info;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
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if (!indio_dev)
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return -ENOMEM;
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info = iio_priv(indio_dev);
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info->regmap = ddata->regmap;
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info->dev = dev;
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platform_set_drvdata(pdev, indio_dev);
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ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
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MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
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MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
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if (ret) {
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dev_err(dev, "adc enable fail: %d\n", ret);
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return ret;
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}
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ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
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if (ret) {
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dev_err(dev, "IIO maps register fail: %d\n", ret);
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goto fail_disable;
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}
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indio_dev->name = "mp2629-adc";
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indio_dev->dev.parent = dev;
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indio_dev->channels = mp2629_channels;
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indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &mp2629_adc_info;
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(dev, "IIO device register fail: %d\n", ret);
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goto fail_map_unregister;
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}
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return 0;
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fail_map_unregister:
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iio_map_array_unregister(indio_dev);
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fail_disable:
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
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MP2629_ADC_CONTINUOUS, 0);
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
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MP2629_ADC_START, 0);
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return ret;
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}
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static int mp2629_adc_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct mp2629_adc *info = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
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MP2629_ADC_CONTINUOUS, 0);
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
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MP2629_ADC_START, 0);
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return 0;
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}
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static const struct of_device_id mp2629_adc_of_match[] = {
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{ .compatible = "mps,mp2629_adc"},
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{}
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};
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MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
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static struct platform_driver mp2629_adc_driver = {
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.driver = {
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.name = "mp2629_adc",
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.of_match_table = mp2629_adc_of_match,
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},
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.probe = mp2629_adc_probe,
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.remove = mp2629_adc_remove,
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};
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module_platform_driver(mp2629_adc_driver);
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MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
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MODULE_DESCRIPTION("MP2629 ADC driver");
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MODULE_LICENSE("GPL");
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@ -14,4 +14,13 @@ struct mp2629_data {
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struct regmap *regmap;
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};
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enum mp2629_adc_chan {
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MP2629_BATT_VOLT,
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MP2629_SYSTEM_VOLT,
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MP2629_INPUT_VOLT,
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MP2629_BATT_CURRENT,
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MP2629_INPUT_CURRENT,
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MP2629_ADC_CHAN_END
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};
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#endif
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