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Date:	Sun, 21 Sep 2014 14:14:17 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	IIO <linux-iio@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DEVICE TREE <devicetree@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>
CC:	Carlo Caione <carlo@...one.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Aaron Lu <aaron.lu@...el.com>, Alan Cox <alan@...ux.intel.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Hartmut Knaack <knaack.h@....de>,
	Fugang Duan <B38611@...escale.com>,
	Arnd Bergmann <arnd@...db.de>,
	Zubair Lutfullah <zubair.lutfullah@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Johannes Thumshirn <johannes.thumshirn@....de>,
	Philippe Reynes <tremyfr@...oo.fr>,
	Angelo Compagnucci <angelo.compagnucci@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	Ramakrishna Pallala <ramakrishna.pallala@...el.com>,
	Peter Meerwald <pmeerw@...erw.net>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v4 2/3] iio/adc: add support for axp288 adc

On 17/09/14 01:11, Jacob Pan wrote:
> Platform driver for X-Powers AXP288 ADC, which is a sub-device of the
> customized AXP288 PMIC for Intel Baytrail-CR platforms. GPADC device
> enumerates as one of the MFD cell devices. It uses IIO infrastructure
> to communicate with userspace and consumer drivers.
>
> Usages of ADC channels include battery charging and thermal sensors.
>
> Based on initial work by:
> Ramakrishna Pallala <ramakrishna.pallala@...el.com>
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
A few more bits from me...

Jonathan
> ---
>  drivers/iio/adc/Kconfig      |   8 ++
>  drivers/iio/adc/Makefile     |   1 +
>  drivers/iio/adc/axp288_adc.c | 254 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 263 insertions(+)
>  create mode 100644 drivers/iio/adc/axp288_adc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 11b048a..db2681b 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -127,6 +127,14 @@ config AT91_ADC
>  	help
>  	  Say yes here to build support for Atmel AT91 ADC.
>
> +config AXP288_ADC
> +	tristate "X-Powers AXP288 ADC driver"
> +	depends on MFD_AXP20X
> +	help
> +	  Say yes here to have support for X-Powers power management IC (PMIC) ADC
> +	  device. Depending on platform configuration, this general purpose ADC can
> +	  be used for sampling sensors such as thermal resistors.
> +
>  config EXYNOS_ADC
>  	tristate "Exynos ADC driver support"
>  	depends on ARCH_EXYNOS || (OF && COMPILE_TEST)
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index ad81b51..19640f9 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_AD7793) += ad7793.o
>  obj-$(CONFIG_AD7887) += ad7887.o
>  obj-$(CONFIG_AD799X) += ad799x.o
>  obj-$(CONFIG_AT91_ADC) += at91_adc.o
> +obj-$(CONFIG_AXP288_ADC) += axp288_adc.o
>  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
>  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>  obj-$(CONFIG_MAX1027) += max1027.o
> diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
> new file mode 100644
> index 0000000..333c624
> --- /dev/null
> +++ b/drivers/iio/adc/axp288_adc.c
> @@ -0,0 +1,254 @@
> +/*
> + * 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
> +#define AXP288_ADC_TS_PIN_GPADC		0xF2
> +#define AXP288_ADC_TS_PIN_ON		0xF3
> +
> +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 device *dev;
Is the dev element ever used?

> +	struct regmap *regmap;
> +};
> +
> +static const struct iio_chan_spec const axp288_adc_channels[] = {
> +	{
> +		.indexed = 1,
> +		.type = IIO_TEMP,
> +		.channel = 0,
> +		.address = AXP288_TS_ADC_H,
> +		.datasheet_name = "CH0",
> +	}, {
> +		.indexed = 1,
> +		.type = IIO_TEMP,
> +		.channel = 1,
> +		.address = AXP288_PMIC_ADC_H,
> +		.datasheet_name = "CH1",
> +	}, {
> +		.indexed = 1,
> +		.type = IIO_TEMP,
> +		.channel = 2,
> +		.address = AXP288_GP_ADC_H,
> +		.datasheet_name = "CH2",
> +	}, {
> +		.indexed = 1,
> +		.type = IIO_CURRENT,
> +		.channel = 3,
> +		.address = AXP20X_BATT_CHRG_I_H,
> +		.datasheet_name = "CH3",
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +	}, {
> +		.indexed = 1,
> +		.type = IIO_CURRENT,
> +		.channel = 4,
> +		.address = AXP20X_BATT_DISCHRG_I_H,
> +		.datasheet_name = "CH4",
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +	}, {
> +		.indexed = 1,
> +		.type = IIO_VOLTAGE,
> +		.channel = 5,
> +		.address = AXP20X_BATT_V_H,
> +		.datasheet_name = "CH5",
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +	},
> +};
> +
> +#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_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);
> +	u8 buf[2];
> +
> +	mutex_lock(&indio_dev->mlock);
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		/* special case for GPADC sample */
> +		if (chan->address == AXP288_GP_ADC_H) {
> +			ret = regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> +					AXP288_ADC_TS_PIN_GPADC);
> +			if (ret) {
> +				dev_err(&indio_dev->dev, "GPADC mode\n");
> +				mutex_unlock(&indio_dev->mlock);
> +				return ret;
> +			}
> +		}
> +	case IIO_CHAN_INFO_PROCESSED:
> +		ret = regmap_bulk_read(info->regmap, chan->address, buf, 2);
> +		if (ret) {
> +			dev_err(&indio_dev->dev, "sample raw data failed\n");
> +			break;
> +		}
> +		*val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
> +		ret = IIO_VAL_INT;
> +		break;
> +	default:
> +		ret = -EINVAL;
> +	}
> +
Why is this statement down here rather than in the relevant case entry
above?
> +	if (mask == IIO_CHAN_INFO_RAW && chan->address == AXP288_GP_ADC_H)
> +		ret = regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> +			AXP288_ADC_TS_PIN_ON);
> +
> +	mutex_unlock(&indio_dev->mlock);
> +
> +	return ret;
> +}
> +
> +static int axp288_adc_enable(struct regmap *regmap, bool enable)
It's fussy, but axp288_adc_set_state or similar would be slightly
less confusing as enable with a parameter of false, just means
don't enable, not disable as i would imagine you intend...

> +{
> +	unsigned int pin_on, adc_en;
> +
> +	if (enable) {
> +		pin_on = AXP288_ADC_TS_PIN_ON;
> +		adc_en = AXP288_ADC_EN_MASK;
> +	} else {
> +		pin_on = ~AXP288_ADC_TS_PIN_ON;
> +		adc_en = ~AXP288_ADC_EN_MASK;
> +	}
> +	if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, pin_on))
> +		return -EIO;
> +
> +	return regmap_write(regmap, AXP20X_ADC_EN1, ~AXP288_ADC_EN_MASK);
> +}
> +
> +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;
> +	ret = axp288_adc_enable(axp20x->regmap, true);
> +	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)
> +		goto err_disable_dev;
> +
> +	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);
> +err_disable_dev:
> +	ret = axp288_adc_enable(axp20x->regmap, false);
> +
> +	return ret;
> +}
> +
> +static int axp288_adc_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> +	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
Would feel a little more consistent to get the regmap from info->regmap,
but doesn't really matter I suppose...
> +
> +	if (axp288_adc_enable(axp20x->regmap, false))
> +		dev_err(&pdev->dev, "Unable to disable ADC device\n");
> +	iio_device_unregister(indio_dev);
> +	iio_map_array_unregister(indio_dev);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver axp288_adc_driver = {
> +	.probe = axp288_adc_probe,
> +	.remove = axp288_adc_remove,
> +	.driver = {
> +		.name = "axp288_adc",
> +		.owner = THIS_MODULE,
> +	},
> +};
> +
> +module_platform_driver(axp288_adc_driver);
> +
> +MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@...ux.intel.com>");
> +MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
> +MODULE_LICENSE("GPL");
>
--
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