262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
/*
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* axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
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*
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* Copyright (C) 2014 Intel Corporation
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/axp20x.h>
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#include <linux/platform_device.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/iio/driver.h>
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#define AXP288_ADC_EN_MASK 0xF1
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#define AXP288_ADC_TS_PIN_GPADC 0xF2
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#define AXP288_ADC_TS_PIN_ON 0xF3
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enum axp288_adc_id {
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AXP288_ADC_TS,
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AXP288_ADC_PMIC,
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AXP288_ADC_GP,
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AXP288_ADC_BATT_CHRG_I,
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AXP288_ADC_BATT_DISCHRG_I,
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AXP288_ADC_BATT_V,
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AXP288_ADC_NR_CHAN,
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};
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struct axp288_adc_info {
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int irq;
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struct regmap *regmap;
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};
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static const struct iio_chan_spec axp288_adc_channels[] = {
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{
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 0,
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.address = AXP288_TS_ADC_H,
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.datasheet_name = "TS_PIN",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 1,
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.address = AXP288_PMIC_ADC_H,
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.datasheet_name = "PMIC_TEMP",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 2,
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.address = AXP288_GP_ADC_H,
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.datasheet_name = "GPADC",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_CURRENT,
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.channel = 3,
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.address = AXP20X_BATT_CHRG_I_H,
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.datasheet_name = "BATT_CHG_I",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_CURRENT,
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.channel = 4,
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.address = AXP20X_BATT_DISCHRG_I_H,
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.datasheet_name = "BATT_DISCHRG_I",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_VOLTAGE,
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.channel = 5,
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.address = AXP20X_BATT_V_H,
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.datasheet_name = "BATT_V",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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},
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};
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#define AXP288_ADC_MAP(_adc_channel_label, _consumer_dev_name, \
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_consumer_channel) \
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{ \
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.adc_channel_label = _adc_channel_label, \
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.consumer_dev_name = _consumer_dev_name, \
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.consumer_channel = _consumer_channel, \
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}
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/* for consumer drivers */
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static struct iio_map axp288_adc_default_maps[] = {
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AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
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AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
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AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
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AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
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AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
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AXP288_ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
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{},
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};
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static int axp288_adc_read_channel(int *val, unsigned long address,
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struct regmap *regmap)
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{
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u8 buf[2];
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if (regmap_bulk_read(regmap, address, buf, 2))
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return -EIO;
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*val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
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return IIO_VAL_INT;
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}
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static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
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unsigned long address)
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{
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/* channels other than GPADC do not need to switch TS pin */
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if (address != AXP288_GP_ADC_H)
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return 0;
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return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
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}
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static int axp288_adc_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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int ret;
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struct axp288_adc_info *info = iio_priv(indio_dev);
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mutex_lock(&indio_dev->mlock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_GPADC,
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chan->address)) {
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dev_err(&indio_dev->dev, "GPADC mode\n");
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ret = -EINVAL;
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break;
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}
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ret = axp288_adc_read_channel(val, chan->address, info->regmap);
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if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_ON,
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chan->address))
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dev_err(&indio_dev->dev, "TS pin restore\n");
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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static int axp288_adc_set_state(struct regmap *regmap)
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{
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/* ADC should be always enabled for internal FG to function */
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if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))
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return -EIO;
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return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
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}
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static const struct iio_info axp288_adc_iio_info = {
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.read_raw = &axp288_adc_read_raw,
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.driver_module = THIS_MODULE,
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};
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static int axp288_adc_probe(struct platform_device *pdev)
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{
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int ret;
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struct axp288_adc_info *info;
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struct iio_dev *indio_dev;
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struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
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indio_dev = devm_iio_device_alloc(&pdev->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->irq = platform_get_irq(pdev, 0);
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if (info->irq < 0) {
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dev_err(&pdev->dev, "no irq resource?\n");
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return info->irq;
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}
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platform_set_drvdata(pdev, indio_dev);
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info->regmap = axp20x->regmap;
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/*
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* Set ADC to enabled state at all time, including system suspend.
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* otherwise internal fuel gauge functionality may be affected.
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*/
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ret = axp288_adc_set_state(axp20x->regmap);
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if (ret) {
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dev_err(&pdev->dev, "unable to enable ADC device\n");
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return ret;
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}
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indio_dev->dev.parent = &pdev->dev;
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indio_dev->name = pdev->name;
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indio_dev->channels = axp288_adc_channels;
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indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
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indio_dev->info = &axp288_adc_iio_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_map_array_register(indio_dev, axp288_adc_default_maps);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&pdev->dev, "unable to register iio device\n");
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goto err_array_unregister;
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}
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return 0;
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err_array_unregister:
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iio_map_array_unregister(indio_dev);
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return ret;
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}
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static int axp288_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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iio_device_unregister(indio_dev);
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iio_map_array_unregister(indio_dev);
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return 0;
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}
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static const struct platform_device_id axp288_adc_id_table[] = {
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{ .name = "axp288_adc" },
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{},
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};
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static struct platform_driver axp288_adc_driver = {
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.probe = axp288_adc_probe,
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.remove = axp288_adc_remove,
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.id_table = axp288_adc_id_table,
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.driver = {
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.name = "axp288_adc",
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},
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};
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MODULE_DEVICE_TABLE(platform, axp288_adc_id_table);
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module_platform_driver(axp288_adc_driver);
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MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
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MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
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MODULE_LICENSE("GPL");
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