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| 1 | +// SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | +/* |
| 3 | + * MP2629 Driver for ADC |
| 4 | + * |
| 5 | + * Copyright 2020 Monolithic Power Systems, Inc |
| 6 | + * |
| 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/module.h> |
| 15 | +#include <linux/mutex.h> |
| 16 | +#include <linux/platform_device.h> |
| 17 | +#include <linux/regmap.h> |
| 18 | + |
| 19 | +#define MP2629_REG_ADC_CTRL 0x03 |
| 20 | +#define MP2629_REG_BATT_VOLT 0x0e |
| 21 | +#define MP2629_REG_SYSTEM_VOLT 0x0f |
| 22 | +#define MP2629_REG_INPUT_VOLT 0x11 |
| 23 | +#define MP2629_REG_BATT_CURRENT 0x12 |
| 24 | +#define MP2629_REG_INPUT_CURRENT 0x13 |
| 25 | + |
| 26 | +#define MP2629_ADC_START BIT(7) |
| 27 | +#define MP2629_ADC_CONTINUOUS BIT(6) |
| 28 | + |
| 29 | +#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc) |
| 30 | + |
| 31 | +#define MP2629_ADC_CHAN(_ch, _type) { \ |
| 32 | + .type = _type, \ |
| 33 | + .indexed = 1, \ |
| 34 | + .datasheet_name = #_ch, \ |
| 35 | + .channel = MP2629_ ## _ch, \ |
| 36 | + .address = MP2629_REG_ ## _ch, \ |
| 37 | + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 38 | + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| 39 | +} |
| 40 | + |
| 41 | +struct mp2629_adc { |
| 42 | + struct regmap *regmap; |
| 43 | + struct device *dev; |
| 44 | +}; |
| 45 | + |
| 46 | +static struct iio_chan_spec mp2629_channels[] = { |
| 47 | + MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE), |
| 48 | + MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE), |
| 49 | + MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE), |
| 50 | + MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT), |
| 51 | + MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT) |
| 52 | +}; |
| 53 | + |
| 54 | +static struct iio_map mp2629_adc_maps[] = { |
| 55 | + MP2629_MAP(BATT_VOLT, "batt-volt"), |
| 56 | + MP2629_MAP(SYSTEM_VOLT, "system-volt"), |
| 57 | + MP2629_MAP(INPUT_VOLT, "input-volt"), |
| 58 | + MP2629_MAP(BATT_CURRENT, "batt-current"), |
| 59 | + MP2629_MAP(INPUT_CURRENT, "input-current") |
| 60 | +}; |
| 61 | + |
| 62 | +static int mp2629_read_raw(struct iio_dev *indio_dev, |
| 63 | + struct iio_chan_spec const *chan, |
| 64 | + int *val, int *val2, long mask) |
| 65 | +{ |
| 66 | + struct mp2629_adc *info = iio_priv(indio_dev); |
| 67 | + unsigned int rval; |
| 68 | + int ret; |
| 69 | + |
| 70 | + switch (mask) { |
| 71 | + case IIO_CHAN_INFO_RAW: |
| 72 | + ret = regmap_read(info->regmap, chan->address, &rval); |
| 73 | + if (ret) |
| 74 | + return ret; |
| 75 | + |
| 76 | + if (chan->address == MP2629_INPUT_VOLT) |
| 77 | + rval &= GENMASK(6, 0); |
| 78 | + *val = rval; |
| 79 | + return IIO_VAL_INT; |
| 80 | + |
| 81 | + case IIO_CHAN_INFO_SCALE: |
| 82 | + switch (chan->channel) { |
| 83 | + case MP2629_BATT_VOLT: |
| 84 | + case MP2629_SYSTEM_VOLT: |
| 85 | + *val = 20; |
| 86 | + return IIO_VAL_INT; |
| 87 | + |
| 88 | + case MP2629_INPUT_VOLT: |
| 89 | + *val = 60; |
| 90 | + return IIO_VAL_INT; |
| 91 | + |
| 92 | + case MP2629_BATT_CURRENT: |
| 93 | + *val = 175; |
| 94 | + *val2 = 10; |
| 95 | + return IIO_VAL_FRACTIONAL; |
| 96 | + |
| 97 | + case MP2629_INPUT_CURRENT: |
| 98 | + *val = 133; |
| 99 | + *val2 = 10; |
| 100 | + return IIO_VAL_FRACTIONAL; |
| 101 | + |
| 102 | + default: |
| 103 | + return -EINVAL; |
| 104 | + } |
| 105 | + |
| 106 | + default: |
| 107 | + return -EINVAL; |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +static const struct iio_info mp2629_adc_info = { |
| 112 | + .read_raw = &mp2629_read_raw, |
| 113 | +}; |
| 114 | + |
| 115 | +static int mp2629_adc_probe(struct platform_device *pdev) |
| 116 | +{ |
| 117 | + struct device *dev = &pdev->dev; |
| 118 | + struct mp2629_data *ddata = dev_get_drvdata(dev->parent); |
| 119 | + struct mp2629_adc *info; |
| 120 | + struct iio_dev *indio_dev; |
| 121 | + int ret; |
| 122 | + |
| 123 | + indio_dev = devm_iio_device_alloc(dev, sizeof(*info)); |
| 124 | + if (!indio_dev) |
| 125 | + return -ENOMEM; |
| 126 | + |
| 127 | + info = iio_priv(indio_dev); |
| 128 | + info->regmap = ddata->regmap; |
| 129 | + info->dev = dev; |
| 130 | + platform_set_drvdata(pdev, indio_dev); |
| 131 | + |
| 132 | + ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
| 133 | + MP2629_ADC_START | MP2629_ADC_CONTINUOUS, |
| 134 | + MP2629_ADC_START | MP2629_ADC_CONTINUOUS); |
| 135 | + if (ret) { |
| 136 | + dev_err(dev, "adc enable fail: %d\n", ret); |
| 137 | + return ret; |
| 138 | + } |
| 139 | + |
| 140 | + ret = iio_map_array_register(indio_dev, mp2629_adc_maps); |
| 141 | + if (ret) { |
| 142 | + dev_err(dev, "IIO maps register fail: %d\n", ret); |
| 143 | + goto fail_disable; |
| 144 | + } |
| 145 | + |
| 146 | + indio_dev->name = "mp2629-adc"; |
| 147 | + indio_dev->dev.parent = dev; |
| 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 | + |
| 161 | +fail_map_unregister: |
| 162 | + iio_map_array_unregister(indio_dev); |
| 163 | + |
| 164 | +fail_disable: |
| 165 | + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
| 166 | + MP2629_ADC_CONTINUOUS, 0); |
| 167 | + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
| 168 | + MP2629_ADC_START, 0); |
| 169 | + |
| 170 | + return ret; |
| 171 | +} |
| 172 | + |
| 173 | +static int mp2629_adc_remove(struct platform_device *pdev) |
| 174 | +{ |
| 175 | + struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| 176 | + struct mp2629_adc *info = iio_priv(indio_dev); |
| 177 | + |
| 178 | + iio_device_unregister(indio_dev); |
| 179 | + |
| 180 | + iio_map_array_unregister(indio_dev); |
| 181 | + |
| 182 | + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
| 183 | + MP2629_ADC_CONTINUOUS, 0); |
| 184 | + regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
| 185 | + MP2629_ADC_START, 0); |
| 186 | + |
| 187 | + return 0; |
| 188 | +} |
| 189 | + |
| 190 | +static const struct of_device_id mp2629_adc_of_match[] = { |
| 191 | + { .compatible = "mps,mp2629_adc"}, |
| 192 | + {} |
| 193 | +}; |
| 194 | +MODULE_DEVICE_TABLE(of, mp2629_adc_of_match); |
| 195 | + |
| 196 | +static struct platform_driver mp2629_adc_driver = { |
| 197 | + .driver = { |
| 198 | + .name = "mp2629_adc", |
| 199 | + .of_match_table = mp2629_adc_of_match, |
| 200 | + }, |
| 201 | + .probe = mp2629_adc_probe, |
| 202 | + .remove = mp2629_adc_remove, |
| 203 | +}; |
| 204 | +module_platform_driver(mp2629_adc_driver); |
| 205 | + |
| 206 | +MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); |
| 207 | +MODULE_DESCRIPTION("MP2629 ADC driver"); |
| 208 | +MODULE_LICENSE("GPL"); |
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