mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Saravanan Sekar](/assets/img/avatar_default.png)
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>
208 lines
4.9 KiB
C
208 lines
4.9 KiB
C
// 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/iio/driver.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/machine.h>
|
|
#include <linux/mfd/mp2629.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.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), \
|
|
}
|
|
|
|
struct mp2629_adc {
|
|
struct regmap *regmap;
|
|
struct device *dev;
|
|
};
|
|
|
|
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)
|
|
};
|
|
|
|
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 *info = iio_priv(indio_dev);
|
|
unsigned int rval;
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = regmap_read(info->regmap, chan->address, &rval);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (chan->address == MP2629_INPUT_VOLT)
|
|
rval &= GENMASK(6, 0);
|
|
*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;
|
|
}
|
|
}
|
|
|
|
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_data *ddata = dev_get_drvdata(dev->parent);
|
|
struct mp2629_adc *info;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
info = iio_priv(indio_dev);
|
|
info->regmap = ddata->regmap;
|
|
info->dev = dev;
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
|
|
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);
|
|
return ret;
|
|
}
|
|
|
|
ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
|
|
if (ret) {
|
|
dev_err(dev, "IIO maps register fail: %d\n", ret);
|
|
goto fail_disable;
|
|
}
|
|
|
|
indio_dev->name = "mp2629-adc";
|
|
indio_dev->dev.parent = dev;
|
|
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 = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
dev_err(dev, "IIO device register fail: %d\n", ret);
|
|
goto fail_map_unregister;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_map_unregister:
|
|
iio_map_array_unregister(indio_dev);
|
|
|
|
fail_disable:
|
|
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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mp2629_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct mp2629_adc *info = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
iio_map_array_unregister(indio_dev);
|
|
|
|
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);
|
|
|
|
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");
|