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Release 4.11 drivers/iio/adc/axp288_adc.c

Directory: drivers/iio/adc
/*
 * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
 *
 * Copyright (C) 2014 Intel Corporation
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/mfd/axp20x.h>
#include <linux/platform_device.h>

#include <linux/iio/iio.h>
#include <linux/iio/machine.h>
#include <linux/iio/driver.h>


#define AXP288_ADC_EN_MASK		0xF1


enum axp288_adc_id {
	
AXP288_ADC_TS,
	
AXP288_ADC_PMIC,
	
AXP288_ADC_GP,
	
AXP288_ADC_BATT_CHRG_I,
	
AXP288_ADC_BATT_DISCHRG_I,
	
AXP288_ADC_BATT_V,
	
AXP288_ADC_NR_CHAN,
};


struct axp288_adc_info {
	
int irq;
	
struct regmap *regmap;
};


static const struct iio_chan_spec axp288_adc_channels[] = {
	{
		.indexed = 1,
		.type = IIO_TEMP,
		.channel = 0,
		.address = AXP288_TS_ADC_H,
		.datasheet_name = "TS_PIN",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        }, {
		.indexed = 1,
		.type = IIO_TEMP,
		.channel = 1,
		.address = AXP288_PMIC_ADC_H,
		.datasheet_name = "PMIC_TEMP",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        }, {
		.indexed = 1,
		.type = IIO_TEMP,
		.channel = 2,
		.address = AXP288_GP_ADC_H,
		.datasheet_name = "GPADC",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        }, {
		.indexed = 1,
		.type = IIO_CURRENT,
		.channel = 3,
		.address = AXP20X_BATT_CHRG_I_H,
		.datasheet_name = "BATT_CHG_I",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        }, {
		.indexed = 1,
		.type = IIO_CURRENT,
		.channel = 4,
		.address = AXP20X_BATT_DISCHRG_I_H,
		.datasheet_name = "BATT_DISCHRG_I",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        }, {
		.indexed = 1,
		.type = IIO_VOLTAGE,
		.channel = 5,
		.address = AXP20X_BATT_V_H,
		.datasheet_name = "BATT_V",
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
        },
};


#define AXP288_ADC_MAP(_adc_channel_label, _consumer_dev_name,       \
		_consumer_channel)				\
	{                                                       \
                .adc_channel_label = _adc_channel_label,        \
                .consumer_dev_name = _consumer_dev_name,        \
                .consumer_channel = _consumer_channel,          \
        }

/* for consumer drivers */

static struct iio_map axp288_adc_default_maps[] = {
	AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
	AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
	AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
	AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
	AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
	AXP288_ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
	{},
};




static int axp288_adc_read_channel(int *val, unsigned long address,
				struct regmap *regmap)
{
	u8 buf[2];

	if (regmap_bulk_read(regmap, address, buf, 2))
		return -EIO;
	*val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);

	return IIO_VAL_INT;
}


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Jacob jun Pan70100.00%1100.00%


Total70100.00%1100.00%






static int axp288_adc_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int *val, int *val2, long mask)
{
	int ret;
	struct axp288_adc_info *info = iio_priv(indio_dev);

	mutex_lock(&indio_dev->mlock);
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = axp288_adc_read_channel(val, chan->address, info->regmap);
		break;
	default:
		ret = -EINVAL;
	}
	mutex_unlock(&indio_dev->mlock);

	return ret;
}


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static const struct iio_info axp288_adc_iio_info = {
	.read_raw = &axp288_adc_read_raw,
	.driver_module = THIS_MODULE,
};




static int axp288_adc_probe(struct platform_device *pdev)
{
	int ret;
	struct axp288_adc_info *info;
	struct iio_dev *indio_dev;
	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);

	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
	if (!indio_dev)
		return -ENOMEM;

	info = iio_priv(indio_dev);
	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		return info->irq;
	}
	platform_set_drvdata(pdev, indio_dev);
	info->regmap = axp20x->regmap;
	/*
         * Set ADC to enabled state at all time, including system suspend.
         * otherwise internal fuel gauge functionality may be affected.
         */
	ret = regmap_write(info->regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
	if (ret) {
		dev_err(&pdev->dev, "unable to enable ADC device\n");
		return ret;
	}

	indio_dev->dev.parent = &pdev->dev;
	indio_dev->name = pdev->name;
	indio_dev->channels = axp288_adc_channels;
	indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
	indio_dev->info = &axp288_adc_iio_info;
	indio_dev->modes = INDIO_DIRECT_MODE;
	ret = iio_map_array_register(indio_dev, axp288_adc_default_maps);
	if (ret < 0)
		return ret;

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to register iio device\n");
		goto err_array_unregister;
	}
	return 0;

err_array_unregister:
	iio_map_array_unregister(indio_dev);

	return ret;
}


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Jacob jun Pan25497.69%150.00%


Hans de Goede62.31%150.00%


Total260100.00%2100.00%






static int axp288_adc_remove(struct platform_device *pdev)
{
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);

	iio_device_unregister(indio_dev);
	iio_map_array_unregister(indio_dev);

	return 0;
}


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static const struct platform_device_id axp288_adc_id_table[] = {
	{ .name = "axp288_adc" },
	{},
};


static struct platform_driver axp288_adc_driver = {
	.probe = axp288_adc_probe,
	.remove = axp288_adc_remove,
	.id_table = axp288_adc_id_table,
	.driver = {
		.name = "axp288_adc",
        },
};

MODULE_DEVICE_TABLE(platform, axp288_adc_id_table);


module_platform_driver(axp288_adc_driver);

MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
MODULE_LICENSE("GPL");

Overall Contributors
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Jacob jun Pan87496.04%240.00%


Aaron Lu293.19%120.00%


Hans de Goede60.66%120.00%


Krzysztof Kozlowski10.11%120.00%


Total910100.00%5100.00%


Directory: drivers/iio/adc



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