1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MP2629 Driver for ADC
5 * Copyright 2020 Monolithic Power Systems, Inc
7 * Author: Saravanan Sekar <sravanhome@gmail.com>
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>
20 #define MP2629_REG_ADC_CTRL 0x03
21 #define MP2629_REG_BATT_VOLT 0x0e
22 #define MP2629_REG_SYSTEM_VOLT 0x0f
23 #define MP2629_REG_INPUT_VOLT 0x11
24 #define MP2629_REG_BATT_CURRENT 0x12
25 #define MP2629_REG_INPUT_CURRENT 0x13
27 #define MP2629_ADC_START BIT(7)
28 #define MP2629_ADC_CONTINUOUS BIT(6)
30 #define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc)
32 #define MP2629_ADC_CHAN(_ch, _type) { \
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), \
43 struct regmap *regmap;
47 static 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)
55 static 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")
63 static int mp2629_read_raw(struct iio_dev *indio_dev,
64 struct iio_chan_spec const *chan,
65 int *val, int *val2, long mask)
67 struct mp2629_adc *info = iio_priv(indio_dev);
72 case IIO_CHAN_INFO_RAW:
73 ret = regmap_read(info->regmap, chan->address, &rval);
77 if (chan->address == MP2629_INPUT_VOLT)
78 rval &= GENMASK(6, 0);
82 case IIO_CHAN_INFO_SCALE:
83 switch (chan->channel) {
84 case MP2629_BATT_VOLT:
85 case MP2629_SYSTEM_VOLT:
89 case MP2629_INPUT_VOLT:
93 case MP2629_BATT_CURRENT:
96 return IIO_VAL_FRACTIONAL;
98 case MP2629_INPUT_CURRENT:
101 return IIO_VAL_FRACTIONAL;
112 static const struct iio_info mp2629_adc_info = {
113 .read_raw = &mp2629_read_raw,
116 static int mp2629_adc_probe(struct platform_device *pdev)
118 struct device *dev = &pdev->dev;
119 struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
120 struct mp2629_adc *info;
121 struct iio_dev *indio_dev;
124 indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
128 info = iio_priv(indio_dev);
129 info->regmap = ddata->regmap;
131 platform_set_drvdata(pdev, indio_dev);
133 ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL,
134 MP2629_ADC_START | MP2629_ADC_CONTINUOUS,
135 MP2629_ADC_START | MP2629_ADC_CONTINUOUS);
137 dev_err(dev, "adc enable fail: %d\n", ret);
141 ret = iio_map_array_register(indio_dev, mp2629_adc_maps);
143 dev_err(dev, "IIO maps register fail: %d\n", ret);
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;
153 ret = iio_device_register(indio_dev);
155 dev_err(dev, "IIO device register fail: %d\n", ret);
156 goto fail_map_unregister;
162 iio_map_array_unregister(indio_dev);
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);
173 static int mp2629_adc_remove(struct platform_device *pdev)
175 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
176 struct mp2629_adc *info = iio_priv(indio_dev);
178 iio_device_unregister(indio_dev);
180 iio_map_array_unregister(indio_dev);
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);
190 static const struct of_device_id mp2629_adc_of_match[] = {
191 { .compatible = "mps,mp2629_adc"},
194 MODULE_DEVICE_TABLE(of, mp2629_adc_of_match);
196 static struct platform_driver mp2629_adc_driver = {
198 .name = "mp2629_adc",
199 .of_match_table = mp2629_adc_of_match,
201 .probe = mp2629_adc_probe,
202 .remove = mp2629_adc_remove,
204 module_platform_driver(mp2629_adc_driver);
206 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
207 MODULE_DESCRIPTION("MP2629 ADC driver");
208 MODULE_LICENSE("GPL");