lkml.org 
[lkml]   [2020]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v2 3/5] iio: adc: mp2629: Add support for mp2629 ADC driver
    Date
    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>
    ---
    drivers/iio/adc/Kconfig | 10 ++
    drivers/iio/adc/Makefile | 1 +
    drivers/iio/adc/mp2629_adc.c | 209 +++++++++++++++++++++++++++++++++++
    3 files changed, 220 insertions(+)
    create mode 100644 drivers/iio/adc/mp2629_adc.c

    diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
    index 82e33082958c..ef0c0cd31855 100644
    --- a/drivers/iio/adc/Kconfig
    +++ b/drivers/iio/adc/Kconfig
    @@ -680,6 +680,16 @@ config MESON_SARADC
    To compile this driver as a module, choose M here: the
    module will be called meson_saradc.

    +config MP2629_ADC
    + tristate "Monolithic MP2629 ADC driver"
    + depends on MFD_MP2629
    + help
    + Say yes to have support for battery charger IC MP2629 ADC device
    + accessed over I2C.
    +
    + This driver provides ADC conversion of system, input power supply
    + and battery voltage & current information.
    +
    config NAU7802
    tristate "Nuvoton NAU7802 ADC driver"
    depends on I2C
    diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
    index 919228900df9..f14416c245a6 100644
    --- a/drivers/iio/adc/Makefile
    +++ b/drivers/iio/adc/Makefile
    @@ -64,6 +64,7 @@ obj-$(CONFIG_MCP3911) += mcp3911.o
    obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
    obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
    obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
    +obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o
    obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
    obj-$(CONFIG_NAU7802) += nau7802.o
    obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
    diff --git a/drivers/iio/adc/mp2629_adc.c b/drivers/iio/adc/mp2629_adc.c
    new file mode 100644
    index 000000000000..1a99196624ed
    --- /dev/null
    +++ b/drivers/iio/adc/mp2629_adc.c
    @@ -0,0 +1,209 @@
    +// SPDX-License-Identifier: GPL-2.0-or-later
    +/*
    + * MP2629 Driver for ADC
    + *
    + * Copyright 2020 Monolithic Power Systems, Inc
    + *
    + * Author: Saravanan Sekar <sravanhome@gmail.com>
    + */
    +
    +#include <linux/platform_device.h>
    +#include <linux/of_device.h>
    +#include <linux/module.h>
    +#include <linux/mutex.h>
    +#include <linux/regulator/consumer.h>
    +#include <linux/sysfs.h>
    +#include <linux/regmap.h>
    +
    +#include <linux/iio/iio.h>
    +#include <linux/iio/machine.h>
    +#include <linux/iio/driver.h>
    +#include <linux/mfd/mp2629.h>
    +
    +#define MP2629_REG_ADC_CTRL 0x03
    +#define MP2629_REG_BATT_VOLT 0x0e
    +#define MP2629_REG_SYSTEM_VOLT 0x0f
    +#define MP2629_REG_INPUT_VOLT 0x11
    +#define MP2629_REG_BATT_CURRENT 0x12
    +#define MP2629_REG_INPUT_CURRENT 0x13
    +
    +#define MP2629_ADC_START BIT(7)
    +#define MP2629_ADC_CONTINUOUS BIT(6)
    +
    +#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
    +
    +#define MP2629_ADC_CHAN(_ch, _type) { \
    + .type = _type, \
    + .indexed = 1, \
    + .datasheet_name = #_ch, \
    + .channel = MP2629_ ## _ch, \
    + .address = MP2629_REG_ ## _ch, \
    + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
    + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
    +}
    +
    +static struct iio_chan_spec mp2629_channels[] = {
    + MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
    + MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
    + MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
    + MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
    + MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
    +};
    +
    +struct mp2629_adc {
    + struct mp2629_info *info;
    + struct device *dev;
    +};
    +
    +static struct iio_map mp2629_adc_maps[] = {
    + MP2629_MAP(BATT_VOLT, "batt-volt"),
    + MP2629_MAP(SYSTEM_VOLT, "system-volt"),
    + MP2629_MAP(INPUT_VOLT, "input-volt"),
    + MP2629_MAP(BATT_CURRENT, "batt-current"),
    + MP2629_MAP(INPUT_CURRENT, "input-current")
    +};
    +
    +static int mp2629_read_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *chan,
    + int *val, int *val2, long mask)
    +{
    + struct mp2629_adc *adc_info = iio_priv(indio_dev);
    + struct mp2629_info *info = adc_info->info;
    + unsigned int rval;
    + int ret;
    +
    + switch (mask) {
    + case IIO_CHAN_INFO_RAW:
    + ret = regmap_read(info->regmap, chan->address, &rval);
    + if (ret < 0)
    + return ret;
    +
    + if (chan->address == MP2629_INPUT_VOLT)
    + rval &= 0x7f;
    + *val = rval;
    + return IIO_VAL_INT;
    +
    + case IIO_CHAN_INFO_SCALE:
    + switch (chan->channel) {
    + case MP2629_BATT_VOLT:
    + case MP2629_SYSTEM_VOLT:
    + *val = 20;
    + return IIO_VAL_INT;
    +
    + case MP2629_INPUT_VOLT:
    + *val = 60;
    + return IIO_VAL_INT;
    +
    + case MP2629_BATT_CURRENT:
    + *val = 175;
    + *val2 = 10;
    + return IIO_VAL_FRACTIONAL;
    +
    + case MP2629_INPUT_CURRENT:
    + *val = 133;
    + *val2 = 10;
    + return IIO_VAL_FRACTIONAL;
    +
    + default:
    + return -EINVAL;
    + }
    +
    + default:
    + return -EINVAL;
    + }
    +
    + return 0;
    +}
    +
    +static const struct iio_info mp2629_adc_info = {
    + .read_raw = &mp2629_read_raw,
    +};
    +
    +static int mp2629_adc_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct mp2629_info *info = dev_get_drvdata(dev->parent);
    + struct mp2629_adc *adc_info;
    + struct iio_dev *indio_dev;
    + int ret;
    +
    + indio_dev = devm_iio_device_alloc(dev, sizeof(*adc_info));
    + if (!indio_dev)
    + return -ENOMEM;
    +
    + adc_info = iio_priv(indio_dev);
    + platform_set_drvdata(pdev, indio_dev);
    + adc_info->info = info;
    + adc_info->dev = dev;
    +
    + ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
    + if (ret) {
    + dev_err(dev, "IIO maps register fail: %d\n", ret);
    + return ret;
    + }
    +
    + indio_dev->name = dev_name(dev);
    + indio_dev->dev.parent = dev;
    + indio_dev->dev.of_node = pdev->dev.of_node;
    + indio_dev->channels = mp2629_channels;
    + indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);
    + indio_dev->modes = INDIO_DIRECT_MODE;
    + indio_dev->info = &mp2629_adc_info;
    +
    + ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
    + MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
    + MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
    + if (ret) {
    + dev_err(dev, "adc enable fail: %d\n", ret);
    + goto fail_unmap;
    + }
    +
    + ret = devm_iio_device_register(dev, indio_dev);
    + if (ret) {
    + dev_err(dev, "IIO device register fail: %d\n", ret);
    + goto fail_unmap;
    + }
    +
    + return 0;
    +
    +fail_unmap:
    + iio_map_array_unregister(indio_dev);
    + return ret;
    +}
    +
    +static int mp2629_adc_remove(struct platform_device *pdev)
    +{
    + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
    + struct mp2629_adc *adc_info = iio_priv(indio_dev);
    + struct mp2629_info *info = adc_info->info;
    +
    + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
    + MP2629_ADC_CONTINUOUS, 0);
    + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
    + MP2629_ADC_START, 0);
    +
    + iio_map_array_unregister(indio_dev);
    + iio_device_unregister(indio_dev);
    +
    + return 0;
    +}
    +
    +static const struct of_device_id mp2629_adc_of_match[] = {
    + { .compatible = "mps,mp2629_adc"},
    + {}
    +};
    +MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
    +
    +static struct platform_driver mp2629_adc_driver = {
    + .driver = {
    + .name = "mp2629_adc",
    + .of_match_table = mp2629_adc_of_match,
    + },
    + .probe = mp2629_adc_probe,
    + .remove = mp2629_adc_remove,
    +};
    +module_platform_driver(mp2629_adc_driver);
    +
    +MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
    +MODULE_DESCRIPTION("MP2629 ADC driver");
    +MODULE_LICENSE("GPL");
    --
    2.17.1
    \
     
     \ /
      Last update: 2020-03-15 02:55    [W:4.968 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site