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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * MP2629 Driver for ADC4 *5 * Copyright 2020 Monolithic Power Systems, Inc6 *7 * Author: Saravanan Sekar <sravanhome@gmail.com>8 */9 10#include <linux/iio/driver.h>11#include <linux/iio/iio.h>12#include <linux/iio/machine.h>13#include <linux/mfd/mp2629.h>14#include <linux/mod_devicetable.h>15#include <linux/module.h>16#include <linux/mutex.h>17#include <linux/platform_device.h>18#include <linux/regmap.h>19 20#define MP2629_REG_ADC_CTRL 0x0321#define MP2629_REG_BATT_VOLT 0x0e22#define MP2629_REG_SYSTEM_VOLT 0x0f23#define MP2629_REG_INPUT_VOLT 0x1124#define MP2629_REG_BATT_CURRENT 0x1225#define MP2629_REG_INPUT_CURRENT 0x1326 27#define MP2629_ADC_START BIT(7)28#define MP2629_ADC_CONTINUOUS BIT(6)29 30#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)31 32#define MP2629_ADC_CHAN(_ch, _type) { \33 .type = _type, \34 .indexed = 1, \35 .datasheet_name = #_ch, \36 .channel = MP2629_ ## _ch, \37 .address = MP2629_REG_ ## _ch, \38 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \39 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \40}41 42struct mp2629_adc {43 struct regmap *regmap;44 struct device *dev;45};46 47static struct iio_chan_spec mp2629_channels[] = {48 MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),49 MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),50 MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),51 MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),52 MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)53};54 55static struct iio_map mp2629_adc_maps[] = {56 MP2629_MAP(BATT_VOLT, "batt-volt"),57 MP2629_MAP(SYSTEM_VOLT, "system-volt"),58 MP2629_MAP(INPUT_VOLT, "input-volt"),59 MP2629_MAP(BATT_CURRENT, "batt-current"),60 MP2629_MAP(INPUT_CURRENT, "input-current"),61 { }62};63 64static int mp2629_read_raw(struct iio_dev *indio_dev,65 struct iio_chan_spec const *chan,66 int *val, int *val2, long mask)67{68 struct mp2629_adc *info = iio_priv(indio_dev);69 unsigned int rval;70 int ret;71 72 switch (mask) {73 case IIO_CHAN_INFO_RAW:74 ret = regmap_read(info->regmap, chan->address, &rval);75 if (ret)76 return ret;77 78 if (chan->channel == MP2629_INPUT_VOLT)79 rval &= GENMASK(6, 0);80 *val = rval;81 return IIO_VAL_INT;82 83 case IIO_CHAN_INFO_SCALE:84 switch (chan->channel) {85 case MP2629_BATT_VOLT:86 case MP2629_SYSTEM_VOLT:87 *val = 20;88 return IIO_VAL_INT;89 90 case MP2629_INPUT_VOLT:91 *val = 60;92 return IIO_VAL_INT;93 94 case MP2629_BATT_CURRENT:95 *val = 175;96 *val2 = 10;97 return IIO_VAL_FRACTIONAL;98 99 case MP2629_INPUT_CURRENT:100 *val = 133;101 *val2 = 10;102 return IIO_VAL_FRACTIONAL;103 104 default:105 return -EINVAL;106 }107 108 default:109 return -EINVAL;110 }111}112 113static const struct iio_info mp2629_adc_info = {114 .read_raw = &mp2629_read_raw,115};116 117static int mp2629_adc_probe(struct platform_device *pdev)118{119 struct device *dev = &pdev->dev;120 struct mp2629_data *ddata = dev_get_drvdata(dev->parent);121 struct mp2629_adc *info;122 struct iio_dev *indio_dev;123 int ret;124 125 indio_dev = devm_iio_device_alloc(dev, sizeof(*info));126 if (!indio_dev)127 return -ENOMEM;128 129 info = iio_priv(indio_dev);130 info->regmap = ddata->regmap;131 info->dev = dev;132 platform_set_drvdata(pdev, indio_dev);133 134 ret = regmap_set_bits(info->regmap, MP2629_REG_ADC_CTRL,135 MP2629_ADC_START | MP2629_ADC_CONTINUOUS);136 if (ret) {137 dev_err(dev, "adc enable fail: %d\n", ret);138 return ret;139 }140 141 ret = iio_map_array_register(indio_dev, mp2629_adc_maps);142 if (ret) {143 dev_err(dev, "IIO maps register fail: %d\n", ret);144 goto fail_disable;145 }146 147 indio_dev->name = "mp2629-adc";148 indio_dev->channels = mp2629_channels;149 indio_dev->num_channels = ARRAY_SIZE(mp2629_channels);150 indio_dev->modes = INDIO_DIRECT_MODE;151 indio_dev->info = &mp2629_adc_info;152 153 ret = iio_device_register(indio_dev);154 if (ret) {155 dev_err(dev, "IIO device register fail: %d\n", ret);156 goto fail_map_unregister;157 }158 159 return 0;160 161fail_map_unregister:162 iio_map_array_unregister(indio_dev);163 164fail_disable:165 regmap_clear_bits(info->regmap, MP2629_REG_ADC_CTRL,166 MP2629_ADC_CONTINUOUS);167 regmap_clear_bits(info->regmap, MP2629_REG_ADC_CTRL, MP2629_ADC_START);168 169 return ret;170}171 172static void mp2629_adc_remove(struct platform_device *pdev)173{174 struct iio_dev *indio_dev = platform_get_drvdata(pdev);175 struct mp2629_adc *info = iio_priv(indio_dev);176 177 iio_device_unregister(indio_dev);178 179 iio_map_array_unregister(indio_dev);180 181 regmap_clear_bits(info->regmap, MP2629_REG_ADC_CTRL,182 MP2629_ADC_CONTINUOUS);183 regmap_clear_bits(info->regmap, MP2629_REG_ADC_CTRL, MP2629_ADC_START);184}185 186static const struct of_device_id mp2629_adc_of_match[] = {187 { .compatible = "mps,mp2629_adc" },188 { }189};190MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);191 192static struct platform_driver mp2629_adc_driver = {193 .driver = {194 .name = "mp2629_adc",195 .of_match_table = mp2629_adc_of_match,196 },197 .probe = mp2629_adc_probe,198 .remove_new = mp2629_adc_remove,199};200module_platform_driver(mp2629_adc_driver);201 202MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");203MODULE_DESCRIPTION("MP2629 ADC driver");204MODULE_LICENSE("GPL");205