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208 lines
4.9 KiB
208 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* MP2629 Driver for ADC |
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* |
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* Copyright 2020 Monolithic Power Systems, Inc |
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* |
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* Author: Saravanan Sekar <[email protected]> |
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*/ |
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#include <linux/iio/driver.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/machine.h> |
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#include <linux/mfd/mp2629.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#define MP2629_REG_ADC_CTRL 0x03 |
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#define MP2629_REG_BATT_VOLT 0x0e |
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#define MP2629_REG_SYSTEM_VOLT 0x0f |
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#define MP2629_REG_INPUT_VOLT 0x11 |
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#define MP2629_REG_BATT_CURRENT 0x12 |
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#define MP2629_REG_INPUT_CURRENT 0x13 |
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#define MP2629_ADC_START BIT(7) |
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#define MP2629_ADC_CONTINUOUS BIT(6) |
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#define MP2629_MAP(_mp, _mpc) IIO_MAP(#_mp, "mp2629_charger", "mp2629-"_mpc) |
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#define MP2629_ADC_CHAN(_ch, _type) { \ |
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.type = _type, \ |
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.indexed = 1, \ |
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.datasheet_name = #_ch, \ |
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.channel = MP2629_ ## _ch, \ |
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.address = MP2629_REG_ ## _ch, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
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} |
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struct mp2629_adc { |
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struct regmap *regmap; |
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struct device *dev; |
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}; |
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static struct iio_chan_spec mp2629_channels[] = { |
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MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE), |
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MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE), |
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MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE), |
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MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT), |
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MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT) |
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}; |
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static struct iio_map mp2629_adc_maps[] = { |
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MP2629_MAP(BATT_VOLT, "batt-volt"), |
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MP2629_MAP(SYSTEM_VOLT, "system-volt"), |
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MP2629_MAP(INPUT_VOLT, "input-volt"), |
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MP2629_MAP(BATT_CURRENT, "batt-current"), |
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MP2629_MAP(INPUT_CURRENT, "input-current") |
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}; |
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static int mp2629_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct mp2629_adc *info = iio_priv(indio_dev); |
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unsigned int rval; |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = regmap_read(info->regmap, chan->address, &rval); |
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if (ret) |
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return ret; |
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if (chan->address == MP2629_INPUT_VOLT) |
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rval &= GENMASK(6, 0); |
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*val = rval; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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switch (chan->channel) { |
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case MP2629_BATT_VOLT: |
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case MP2629_SYSTEM_VOLT: |
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*val = 20; |
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return IIO_VAL_INT; |
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case MP2629_INPUT_VOLT: |
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*val = 60; |
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return IIO_VAL_INT; |
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case MP2629_BATT_CURRENT: |
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*val = 175; |
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*val2 = 10; |
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return IIO_VAL_FRACTIONAL; |
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case MP2629_INPUT_CURRENT: |
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*val = 133; |
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*val2 = 10; |
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return IIO_VAL_FRACTIONAL; |
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default: |
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return -EINVAL; |
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} |
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default: |
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return -EINVAL; |
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} |
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} |
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static const struct iio_info mp2629_adc_info = { |
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.read_raw = &mp2629_read_raw, |
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}; |
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static int mp2629_adc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct mp2629_data *ddata = dev_get_drvdata(dev->parent); |
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struct mp2629_adc *info; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*info)); |
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if (!indio_dev) |
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return -ENOMEM; |
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info = iio_priv(indio_dev); |
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info->regmap = ddata->regmap; |
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info->dev = dev; |
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platform_set_drvdata(pdev, indio_dev); |
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ret = regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
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MP2629_ADC_START | MP2629_ADC_CONTINUOUS, |
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MP2629_ADC_START | MP2629_ADC_CONTINUOUS); |
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if (ret) { |
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dev_err(dev, "adc enable fail: %d\n", ret); |
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return ret; |
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} |
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ret = iio_map_array_register(indio_dev, mp2629_adc_maps); |
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if (ret) { |
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dev_err(dev, "IIO maps register fail: %d\n", ret); |
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goto fail_disable; |
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} |
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indio_dev->name = "mp2629-adc"; |
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indio_dev->dev.parent = dev; |
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indio_dev->channels = mp2629_channels; |
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indio_dev->num_channels = ARRAY_SIZE(mp2629_channels); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->info = &mp2629_adc_info; |
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ret = iio_device_register(indio_dev); |
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if (ret) { |
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dev_err(dev, "IIO device register fail: %d\n", ret); |
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goto fail_map_unregister; |
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} |
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return 0; |
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fail_map_unregister: |
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iio_map_array_unregister(indio_dev); |
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fail_disable: |
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
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MP2629_ADC_CONTINUOUS, 0); |
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
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MP2629_ADC_START, 0); |
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return ret; |
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} |
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static int mp2629_adc_remove(struct platform_device *pdev) |
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{ |
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struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
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struct mp2629_adc *info = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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iio_map_array_unregister(indio_dev); |
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
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MP2629_ADC_CONTINUOUS, 0); |
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regmap_update_bits(info->regmap, MP2629_REG_ADC_CTRL, |
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MP2629_ADC_START, 0); |
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return 0; |
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} |
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static const struct of_device_id mp2629_adc_of_match[] = { |
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{ .compatible = "mps,mp2629_adc"}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, mp2629_adc_of_match); |
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static struct platform_driver mp2629_adc_driver = { |
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.driver = { |
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.name = "mp2629_adc", |
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.of_match_table = mp2629_adc_of_match, |
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}, |
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.probe = mp2629_adc_probe, |
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.remove = mp2629_adc_remove, |
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}; |
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module_platform_driver(mp2629_adc_driver); |
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MODULE_AUTHOR("Saravanan Sekar <[email protected]>"); |
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MODULE_DESCRIPTION("MP2629 ADC driver"); |
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MODULE_LICENSE("GPL");
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