Commit 0e34d5de authored by Quentin Schulz's avatar Quentin Schulz Committed by Lee Jones
Browse files

iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs 



The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the
battery voltage, battery charge and discharge currents, AC-in and VBUS
voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature.

This adds support for most of AXP20X and AXP22X ADCs.

Signed-off-by: default avatarQuentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: default avatarChen-Yu Tsai <wens@csie.org>
Reviewed-by: default avatarJonathan Cameron <jic23@kernel.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent be269180

drivers/iio/adc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC 
	  To compile this driver as a module, choose M here: the module will be

	  called at91-sama5d2_adc.



config AXP20X_ADC

	tristate "X-Powers AXP20X and AXP22X ADC driver"

	depends on MFD_AXP20X

	help

	  Say yes here to have support for X-Powers power management IC (PMIC)

	  AXP20X and AXP22X ADC devices.



	  To compile this driver as a module, choose M here: the module will be

	  called axp20x_adc.



config AXP288_ADC

	tristate "X-Powers AXP288 ADC driver"

	depends on MFD_AXP20X

drivers/iio/adc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o 
obj-$(CONFIG_AD799X) += ad799x.o

obj-$(CONFIG_AT91_ADC) += at91_adc.o

obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o

obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o

obj-$(CONFIG_AXP288_ADC) += axp288_adc.o

obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o

obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o

drivers/iio/adc/axp20x_adc.c

0 → 100644
+617 −0
Original line number Diff line number Diff line 
/* ADC driver for AXP20X and AXP22X PMICs

 *

 * Copyright (c) 2016 Free Electrons NextThing Co.

 *	Quentin Schulz <quentin.schulz@free-electrons.com>

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License version 2 as published by the

 * Free Software Foundation.

 */



#include <linux/completion.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/regmap.h>

#include <linux/thermal.h>



#include <linux/iio/iio.h>

#include <linux/iio/driver.h>

#include <linux/iio/machine.h>

#include <linux/mfd/axp20x.h>



#define AXP20X_ADC_EN1_MASK			GENMASK(7, 0)



#define AXP20X_ADC_EN2_MASK			(GENMASK(3, 2) | BIT(7))

#define AXP22X_ADC_EN1_MASK			(GENMASK(7, 5) | BIT(0))



#define AXP20X_GPIO10_IN_RANGE_GPIO0		BIT(0)

#define AXP20X_GPIO10_IN_RANGE_GPIO1		BIT(1)

#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x)	((x) & BIT(0))

#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x)	(((x) & BIT(0)) << 1)



#define AXP20X_ADC_RATE_MASK			GENMASK(7, 6)

#define AXP20X_ADC_RATE_HZ(x)			((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)

#define AXP22X_ADC_RATE_HZ(x)			((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)



#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg)	\

	{							\

		.type = _type,					\

		.indexed = 1,					\

		.channel = _channel,				\

		.address = _reg,				\

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\

				      BIT(IIO_CHAN_INFO_SCALE),	\

		.datasheet_name = _name,			\

	}



#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \

	{							\

		.type = _type,					\

		.indexed = 1,					\

		.channel = _channel,				\

		.address = _reg,				\

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\

				      BIT(IIO_CHAN_INFO_SCALE) |\

				      BIT(IIO_CHAN_INFO_OFFSET),\

		.datasheet_name = _name,			\

	}



struct axp_data;



struct axp20x_adc_iio {

	struct regmap		*regmap;

	struct axp_data		*data;

};



enum axp20x_adc_channel_v {

	AXP20X_ACIN_V = 0,

	AXP20X_VBUS_V,

	AXP20X_TS_IN,

	AXP20X_GPIO0_V,

	AXP20X_GPIO1_V,

	AXP20X_IPSOUT_V,

	AXP20X_BATT_V,

};



enum axp20x_adc_channel_i {

	AXP20X_ACIN_I = 0,

	AXP20X_VBUS_I,

	AXP20X_BATT_CHRG_I,

	AXP20X_BATT_DISCHRG_I,

};



enum axp22x_adc_channel_v {

	AXP22X_TS_IN = 0,

	AXP22X_BATT_V,

};



enum axp22x_adc_channel_i {

	AXP22X_BATT_CHRG_I = 1,

	AXP22X_BATT_DISCHRG_I,

};



static struct iio_map axp20x_maps[] = {

	{

		.consumer_dev_name = "axp20x-usb-power-supply",

		.consumer_channel = "vbus_v",

		.adc_channel_label = "vbus_v",

	}, {

		.consumer_dev_name = "axp20x-usb-power-supply",

		.consumer_channel = "vbus_i",

		.adc_channel_label = "vbus_i",

	}, {

		.consumer_dev_name = "axp20x-ac-power-supply",

		.consumer_channel = "acin_v",

		.adc_channel_label = "acin_v",

	}, {

		.consumer_dev_name = "axp20x-ac-power-supply",

		.consumer_channel = "acin_i",

		.adc_channel_label = "acin_i",

	}, {

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_v",

		.adc_channel_label = "batt_v",

	}, {

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_chrg_i",

		.adc_channel_label = "batt_chrg_i",

	}, {

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_dischrg_i",

		.adc_channel_label = "batt_dischrg_i",

	}, { /* sentinel */ }

};



static struct iio_map axp22x_maps[] = {

	{

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_v",

		.adc_channel_label = "batt_v",

	}, {

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_chrg_i",

		.adc_channel_label = "batt_chrg_i",

	}, {

		.consumer_dev_name = "axp20x-battery-power-supply",

		.consumer_channel = "batt_dischrg_i",

		.adc_channel_label = "batt_dischrg_i",

	}, { /* sentinel */ }

};



/*

 * Channels are mapped by physical system. Their channels share the same index.

 * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw.

 * The only exception is for the battery. batt_v will be in_voltage6_raw and

 * charge current in_current6_raw and discharge current will be in_current7_raw.

 */

static const struct iio_chan_spec axp20x_adc_channels[] = {

	AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE,

			   AXP20X_ACIN_V_ADC_H),

	AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT,

			   AXP20X_ACIN_I_ADC_H),

	AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE,

			   AXP20X_VBUS_V_ADC_H),

	AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT,

			   AXP20X_VBUS_I_ADC_H),

	{

		.type = IIO_TEMP,

		.address = AXP20X_TEMP_ADC_H,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

				      BIT(IIO_CHAN_INFO_SCALE) |

				      BIT(IIO_CHAN_INFO_OFFSET),

		.datasheet_name = "pmic_temp",

	},

	AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE,

				  AXP20X_GPIO0_V_ADC_H),

	AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE,

				  AXP20X_GPIO1_V_ADC_H),

	AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE,

			   AXP20X_IPSOUT_V_HIGH_H),

	AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE,

			   AXP20X_BATT_V_H),

	AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,

			   AXP20X_BATT_CHRG_I_H),

	AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,

			   AXP20X_BATT_DISCHRG_I_H),

};



static const struct iio_chan_spec axp22x_adc_channels[] = {

	{

		.type = IIO_TEMP,

		.address = AXP22X_PMIC_TEMP_H,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

				      BIT(IIO_CHAN_INFO_SCALE) |

				      BIT(IIO_CHAN_INFO_OFFSET),

		.datasheet_name = "pmic_temp",

	},

	AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE,

			   AXP20X_BATT_V_H),

	AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,

			   AXP20X_BATT_CHRG_I_H),

	AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,

			   AXP20X_BATT_DISCHRG_I_H),

};



static int axp20x_adc_raw(struct iio_dev *indio_dev,

			  struct iio_chan_spec const *chan, int *val)

{

	struct axp20x_adc_iio *info = iio_priv(indio_dev);

	int size = 12;



	/*

	 * N.B.:  Unlike the Chinese datasheets tell, the charging current is

	 * stored on 12 bits, not 13 bits. Only discharging current is on 13

	 * bits.

	 */

	if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I)

		size = 13;

	else

		size = 12;



	*val = axp20x_read_variable_width(info->regmap, chan->address, size);

	if (*val < 0)

		return *val;



	return IIO_VAL_INT;

}



static int axp22x_adc_raw(struct iio_dev *indio_dev,

			  struct iio_chan_spec const *chan, int *val)

{

	struct axp20x_adc_iio *info = iio_priv(indio_dev);

	int size;



	/*

	 * N.B.: Unlike the Chinese datasheets tell, the charging current is

	 * stored on 12 bits, not 13 bits. Only discharging current is on 13

	 * bits.

	 */

	if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I)

		size = 13;

	else

		size = 12;



	*val = axp20x_read_variable_width(info->regmap, chan->address, size);

	if (*val < 0)

		return *val;



	return IIO_VAL_INT;

}



static int axp20x_adc_scale_voltage(int channel, int *val, int *val2)

{

	switch (channel) {

	case AXP20X_ACIN_V:

	case AXP20X_VBUS_V:

		*val = 1;

		*val2 = 700000;

		return IIO_VAL_INT_PLUS_MICRO;



	case AXP20X_GPIO0_V:

	case AXP20X_GPIO1_V:

		*val = 0;

		*val2 = 500000;

		return IIO_VAL_INT_PLUS_MICRO;



	case AXP20X_BATT_V:

		*val = 1;

		*val2 = 100000;

		return IIO_VAL_INT_PLUS_MICRO;



	case AXP20X_IPSOUT_V:

		*val = 1;

		*val2 = 400000;

		return IIO_VAL_INT_PLUS_MICRO;



	default:

		return -EINVAL;

	}

}



static int axp20x_adc_scale_current(int channel, int *val, int *val2)

{

	switch (channel) {

	case AXP20X_ACIN_I:

		*val = 0;

		*val2 = 625000;

		return IIO_VAL_INT_PLUS_MICRO;



	case AXP20X_VBUS_I:

		*val = 0;

		*val2 = 375000;

		return IIO_VAL_INT_PLUS_MICRO;



	case AXP20X_BATT_DISCHRG_I:

	case AXP20X_BATT_CHRG_I:

		*val = 0;

		*val2 = 500000;

		return IIO_VAL_INT_PLUS_MICRO;



	default:

		return -EINVAL;

	}

}



static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val,

			    int *val2)

{

	switch (chan->type) {

	case IIO_VOLTAGE:

		return axp20x_adc_scale_voltage(chan->channel, val, val2);



	case IIO_CURRENT:

		return axp20x_adc_scale_current(chan->channel, val, val2);



	case IIO_TEMP:

		*val = 100;

		return IIO_VAL_INT;



	default:

		return -EINVAL;

	}

}



static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val,

			    int *val2)

{

	switch (chan->type) {

	case IIO_VOLTAGE:

		if (chan->channel != AXP22X_BATT_V)

			return -EINVAL;



		*val = 1;

		*val2 = 100000;

		return IIO_VAL_INT_PLUS_MICRO;



	case IIO_CURRENT:

		*val = 0;

		*val2 = 500000;

		return IIO_VAL_INT_PLUS_MICRO;



	case IIO_TEMP:

		*val = 100;

		return IIO_VAL_INT;



	default:

		return -EINVAL;

	}

}



static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,

				     int *val)

{

	struct axp20x_adc_iio *info = iio_priv(indio_dev);

	int ret;



	ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val);

	if (ret < 0)

		return ret;



	switch (channel) {

	case AXP20X_GPIO0_V:

		*val &= AXP20X_GPIO10_IN_RANGE_GPIO0;

		break;



	case AXP20X_GPIO1_V:

		*val &= AXP20X_GPIO10_IN_RANGE_GPIO1;

		break;



	default:

		return -EINVAL;

	}



	*val = !!(*val) * 700000;



	return IIO_VAL_INT;

}



static int axp20x_adc_offset(struct iio_dev *indio_dev,

			     struct iio_chan_spec const *chan, int *val)

{

	switch (chan->type) {

	case IIO_VOLTAGE:

		return axp20x_adc_offset_voltage(indio_dev, chan->channel, val);



	case IIO_TEMP:

		*val = -1447;

		return IIO_VAL_INT;



	default:

		return -EINVAL;

	}

}



static int axp20x_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan, int *val,

			   int *val2, long mask)

{

	switch (mask) {

	case IIO_CHAN_INFO_OFFSET:

		return axp20x_adc_offset(indio_dev, chan, val);



	case IIO_CHAN_INFO_SCALE:

		return axp20x_adc_scale(chan, val, val2);



	case IIO_CHAN_INFO_RAW:

		return axp20x_adc_raw(indio_dev, chan, val);



	default:

		return -EINVAL;

	}

}



static int axp22x_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan, int *val,

			   int *val2, long mask)

{

	switch (mask) {

	case IIO_CHAN_INFO_OFFSET:

		*val = -2677;

		return IIO_VAL_INT;



	case IIO_CHAN_INFO_SCALE:

		return axp22x_adc_scale(chan, val, val2);



	case IIO_CHAN_INFO_RAW:

		return axp22x_adc_raw(indio_dev, chan, val);



	default:

		return -EINVAL;

	}

}



static int axp20x_write_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *chan, int val, int val2,

			    long mask)

{

	struct axp20x_adc_iio *info = iio_priv(indio_dev);

	unsigned int reg, regval;



	/*

	 * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets

	 * for (independently) GPIO0 and GPIO1 when in ADC mode.

	 */

	if (mask != IIO_CHAN_INFO_OFFSET)

		return -EINVAL;



	if (val != 0 && val != 700000)

		return -EINVAL;



	switch (chan->channel) {

	case AXP20X_GPIO0_V:

		reg = AXP20X_GPIO10_IN_RANGE_GPIO0;

		regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val);

		break;



	case AXP20X_GPIO1_V:

		reg = AXP20X_GPIO10_IN_RANGE_GPIO1;

		regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val);

		break;



	default:

		return -EINVAL;

	}



	return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg,

				  regval);

}



static const struct iio_info axp20x_adc_iio_info = {

	.read_raw = axp20x_read_raw,

	.write_raw = axp20x_write_raw,

	.driver_module = THIS_MODULE,

};



static const struct iio_info axp22x_adc_iio_info = {

	.read_raw = axp22x_read_raw,

	.driver_module = THIS_MODULE,

};



static int axp20x_adc_rate(int rate)

{

	return AXP20X_ADC_RATE_HZ(rate);

}



static int axp22x_adc_rate(int rate)

{

	return AXP22X_ADC_RATE_HZ(rate);

}



struct axp_data {

	const struct iio_info		*iio_info;

	int				num_channels;

	struct iio_chan_spec const	*channels;

	unsigned long			adc_en1_mask;

	int				(*adc_rate)(int rate);

	bool				adc_en2;

	struct iio_map			*maps;

};



static const struct axp_data axp20x_data = {

	.iio_info = &axp20x_adc_iio_info,

	.num_channels = ARRAY_SIZE(axp20x_adc_channels),

	.channels = axp20x_adc_channels,

	.adc_en1_mask = AXP20X_ADC_EN1_MASK,

	.adc_rate = axp20x_adc_rate,

	.adc_en2 = true,

	.maps = axp20x_maps,

};



static const struct axp_data axp22x_data = {

	.iio_info = &axp22x_adc_iio_info,

	.num_channels = ARRAY_SIZE(axp22x_adc_channels),

	.channels = axp22x_adc_channels,

	.adc_en1_mask = AXP22X_ADC_EN1_MASK,

	.adc_rate = axp22x_adc_rate,

	.adc_en2 = false,

	.maps = axp22x_maps,

};



static const struct platform_device_id axp20x_adc_id_match[] = {

	{ .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, },

	{ .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, },

	{ /* sentinel */ },

};

MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match);



static int axp20x_probe(struct platform_device *pdev)

{

	struct axp20x_adc_iio *info;

	struct iio_dev *indio_dev;

	struct axp20x_dev *axp20x_dev;

	int ret;



	axp20x_dev = 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);

	platform_set_drvdata(pdev, indio_dev);



	info->regmap = axp20x_dev->regmap;

	indio_dev->dev.parent = &pdev->dev;

	indio_dev->dev.of_node = pdev->dev.of_node;

	indio_dev->modes = INDIO_DIRECT_MODE;



	info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data;



	indio_dev->name = platform_get_device_id(pdev)->name;

	indio_dev->info = info->data->iio_info;

	indio_dev->num_channels = info->data->num_channels;

	indio_dev->channels = info->data->channels;



	/* Enable the ADCs on IP */

	regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask);



	if (info->data->adc_en2)

		/* Enable GPIO0/1 and internal temperature ADCs */

		regmap_update_bits(info->regmap, AXP20X_ADC_EN2,

				   AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK);



	/* Configure ADCs rate */

	regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK,

			   info->data->adc_rate(100));



	ret = iio_map_array_register(indio_dev, info->data->maps);

	if (ret < 0) {

		dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret);

		goto fail_map;

	}



	ret = iio_device_register(indio_dev);

	if (ret < 0) {

		dev_err(&pdev->dev, "could not register the device\n");

		goto fail_register;

	}



	return 0;



fail_register:

	iio_map_array_unregister(indio_dev);



fail_map:

	regmap_write(info->regmap, AXP20X_ADC_EN1, 0);



	if (info->data->adc_en2)

		regmap_write(info->regmap, AXP20X_ADC_EN2, 0);



	return ret;

}



static int axp20x_remove(struct platform_device *pdev)

{

	struct iio_dev *indio_dev = platform_get_drvdata(pdev);

	struct axp20x_adc_iio *info = iio_priv(indio_dev);



	iio_device_unregister(indio_dev);

	iio_map_array_unregister(indio_dev);



	regmap_write(info->regmap, AXP20X_ADC_EN1, 0);



	if (info->data->adc_en2)

		regmap_write(info->regmap, AXP20X_ADC_EN2, 0);



	return 0;

}



static struct platform_driver axp20x_adc_driver = {

	.driver = {

		.name = "axp20x-adc",

	},

	.id_table = axp20x_adc_id_match,

	.probe = axp20x_probe,

	.remove = axp20x_remove,

};



module_platform_driver(axp20x_adc_driver);



MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs");

MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");

MODULE_LICENSE("GPL");

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