Commit e932d4f0 authored by Linus Walleij's avatar Linus Walleij Committed by Jonathan Cameron
Browse files

iio: adc: break out common code from SPMI VADC 



The SPMI VADC and the earlier XOADC share a subset of
common code, so to be able to use the same code in both
drivers, we break out a separate file with the common code,
prefix exported functions that are no longer static with
qcom_* and bake an object qcom-spmi-vadc.o that contains both
files: qcom-vadc-common.o and qcom-spmi-vadc-core.o.

As we need to follow the procedure for making a kernel module
or compiled in object from several files, but still want to
produce the same module name, rename the qcom-spmi-vadc.c
file to qcom-spmi-vadc-core.c so we can bake the two objects
into qcom-spmi-vadc.o

Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: Ivan T. Ivanov <iivanov.xz@gmail.com>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 96b3c833

drivers/iio/adc/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -496,6 +496,9 @@ config PALMAS_GPADC 
	  is used in smartphones and tablets and supports a 16 channel

	  general purpose ADC.



config QCOM_VADC_COMMON

	tristate



config QCOM_SPMI_IADC

	tristate "Qualcomm SPMI PMIC current ADC"

	depends on SPMI
@@ -514,6 +517,7 @@ config QCOM_SPMI_VADC 
	tristate "Qualcomm SPMI PMIC voltage ADC"

	depends on SPMI

	select REGMAP_SPMI

	select QCOM_VADC_COMMON

	help

	  This is the IIO Voltage ADC driver for Qualcomm QPNP VADC Chip.

drivers/iio/adc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o 
obj-$(CONFIG_NAU7802) += nau7802.o

obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o

obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o

obj-$(CONFIG_QCOM_VADC_COMMON) += qcom-vadc-common.o

obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o

obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o

obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o

drivers/iio/adc/qcom-spmi-vadc.c

+15 −310
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ 


#include <dt-bindings/iio/qcom,spmi-vadc.h>



#include "qcom-vadc-common.h"



/* VADC register and bit definitions */

#define VADC_REVISION2				0x1

#define VADC_REVISION2_SUPPORTED_VADC		1
@@ -75,83 +77,9 @@ 


#define VADC_DATA				0x60	/* 16 bits */



#define VADC_CONV_TIME_MIN_US			2000

#define VADC_CONV_TIME_MAX_US			2100



/* Min ADC code represents 0V */

#define VADC_MIN_ADC_CODE			0x6000

/* Max ADC code represents full-scale range of 1.8V */

#define VADC_MAX_ADC_CODE			0xa800



#define VADC_ABSOLUTE_RANGE_UV			625000

#define VADC_RATIOMETRIC_RANGE			1800



#define VADC_DEF_PRESCALING			0 /* 1:1 */

#define VADC_DEF_DECIMATION			0 /* 512 */

#define VADC_DEF_HW_SETTLE_TIME			0 /* 0 us */

#define VADC_DEF_AVG_SAMPLES			0 /* 1 sample */

#define VADC_DEF_CALIB_TYPE			VADC_CALIB_ABSOLUTE



#define VADC_DECIMATION_MIN			512

#define VADC_DECIMATION_MAX			4096



#define VADC_HW_SETTLE_DELAY_MAX		10000

#define VADC_AVG_SAMPLES_MAX			512



#define KELVINMIL_CELSIUSMIL			273150



#define PMI_CHG_SCALE_1				-138890

#define PMI_CHG_SCALE_2				391750000000LL



#define VADC_CHAN_MIN			VADC_USBIN

#define VADC_CHAN_MAX			VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM



/**

 * struct vadc_map_pt - Map the graph representation for ADC channel

 * @x: Represent the ADC digitized code.

 * @y: Represent the physical data which can be temperature, voltage,

 *     resistance.

 */

struct vadc_map_pt {

	s32 x;

	s32 y;

};



/*

 * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.

 * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for

 * calibration.

 */

enum vadc_calibration {

	VADC_CALIB_ABSOLUTE = 0,

	VADC_CALIB_RATIOMETRIC

};



/**

 * struct vadc_linear_graph - Represent ADC characteristics.

 * @dy: numerator slope to calculate the gain.

 * @dx: denominator slope to calculate the gain.

 * @gnd: A/D word of the ground reference used for the channel.

 *

 * Each ADC device has different offset and gain parameters which are

 * computed to calibrate the device.

 */

struct vadc_linear_graph {

	s32 dy;

	s32 dx;

	s32 gnd;

};



/**

 * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.

 * @num: the inverse numerator of the gain applied to the input channel.

 * @den: the inverse denominator of the gain applied to the input channel.

 */

struct vadc_prescale_ratio {

	u32 num;

	u32 den;

};



/**

 * struct vadc_channel_prop - VADC channel property.

 * @channel: channel number, refer to the channel list.
@@ -162,9 +90,8 @@ struct vadc_prescale_ratio { 
 *	start of conversion.

 * @avg_samples: ability to provide single result from the ADC

 *	that is an average of multiple measurements.

 * @scale_fn: Represents the scaling function to convert voltage

 * @scale_fn_type: Represents the scaling function to convert voltage

 *	physical units desired by the client for the channel.

 *	Referenced from enum vadc_scale_fn_type.

 */

struct vadc_channel_prop {

	unsigned int channel;
@@ -173,7 +100,7 @@ struct vadc_channel_prop { 
	unsigned int prescale;

	unsigned int hw_settle_time;

	unsigned int avg_samples;

	unsigned int scale_fn;

	enum vadc_scale_fn_type scale_fn_type;

};



/**
@@ -204,35 +131,6 @@ struct vadc_priv { 
	struct mutex		 lock;

};



/**

 * struct vadc_scale_fn - Scaling function prototype

 * @scale: Function pointer to one of the scaling functions

 *	which takes the adc properties, channel properties,

 *	and returns the physical result.

 */

struct vadc_scale_fn {

	int (*scale)(struct vadc_priv *, const struct vadc_channel_prop *,

		     u16, int *);

};



/**

 * enum vadc_scale_fn_type - Scaling function to convert ADC code to

 *				physical scaled units for the channel.

 * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).

 * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.

 *				 Uses a mapping table with 100K pullup.

 * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.

 * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.

 * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp

 */

enum vadc_scale_fn_type {

	SCALE_DEFAULT = 0,

	SCALE_THERM_100K_PULLUP,

	SCALE_PMIC_THERM,

	SCALE_XOTHERM,

	SCALE_PMI_CHG_TEMP,

};



static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {

	{.num =  1, .den =  1},

	{.num =  1, .den =  3},
@@ -244,44 +142,6 @@ static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { 
	{.num =  1, .den = 10}

};



/* Voltage to temperature */

static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {

	{1758,	-40},

	{1742,	-35},

	{1719,	-30},

	{1691,	-25},

	{1654,	-20},

	{1608,	-15},

	{1551,	-10},

	{1483,	-5},

	{1404,	0},

	{1315,	5},

	{1218,	10},

	{1114,	15},

	{1007,	20},

	{900,	25},

	{795,	30},

	{696,	35},

	{605,	40},

	{522,	45},

	{448,	50},

	{383,	55},

	{327,	60},

	{278,	65},

	{237,	70},

	{202,	75},

	{172,	80},

	{146,	85},

	{125,	90},

	{107,	95},

	{92,	100},

	{79,	105},

	{68,	110},

	{59,	115},

	{51,	120},

	{44,	125}

};



static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)

{

	return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
@@ -553,159 +413,6 @@ err: 
	return ret;

}



static int vadc_map_voltage_temp(const struct vadc_map_pt *pts,

				 u32 tablesize, s32 input, s64 *output)

{

	bool descending = 1;

	u32 i = 0;



	if (!pts)

		return -EINVAL;



	/* Check if table is descending or ascending */

	if (tablesize > 1) {

		if (pts[0].x < pts[1].x)

			descending = 0;

	}



	while (i < tablesize) {

		if ((descending) && (pts[i].x < input)) {

			/* table entry is less than measured*/

			 /* value and table is descending, stop */

			break;

		} else if ((!descending) &&

				(pts[i].x > input)) {

			/* table entry is greater than measured*/

			/*value and table is ascending, stop */

			break;

		}

		i++;

	}



	if (i == 0) {

		*output = pts[0].y;

	} else if (i == tablesize) {

		*output = pts[tablesize - 1].y;

	} else {

		/* result is between search_index and search_index-1 */

		/* interpolate linearly */

		*output = (((s32)((pts[i].y - pts[i - 1].y) *

			(input - pts[i - 1].x)) /

			(pts[i].x - pts[i - 1].x)) +

			pts[i - 1].y);

	}



	return 0;

}



static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code,

			     const struct vadc_channel_prop *prop,

			     s64 *scale_voltage)

{

	*scale_voltage = (adc_code -

		vadc->graph[prop->calibration].gnd);

	*scale_voltage *= vadc->graph[prop->calibration].dx;

	*scale_voltage = div64_s64(*scale_voltage,

		vadc->graph[prop->calibration].dy);

	if (prop->calibration == VADC_CALIB_ABSOLUTE)

		*scale_voltage +=

		vadc->graph[prop->calibration].dx;



	if (*scale_voltage < 0)

		*scale_voltage = 0;

}



static int vadc_scale_volt(struct vadc_priv *vadc,

			   const struct vadc_channel_prop *prop, u16 adc_code,

			   int *result_uv)

{

	const struct vadc_prescale_ratio *prescale;

	s64 voltage = 0, result = 0;



	vadc_scale_calib(vadc, adc_code, prop, &voltage);



	prescale = &vadc_prescale_ratios[prop->prescale];

	voltage = voltage * prescale->den;

	result = div64_s64(voltage, prescale->num);

	*result_uv = result;



	return 0;

}



static int vadc_scale_therm(struct vadc_priv *vadc,

			    const struct vadc_channel_prop *prop, u16 adc_code,

			    int *result_mdec)

{

	s64 voltage = 0, result = 0;



	vadc_scale_calib(vadc, adc_code, prop, &voltage);



	if (prop->calibration == VADC_CALIB_ABSOLUTE)

		voltage = div64_s64(voltage, 1000);



	vadc_map_voltage_temp(adcmap_100k_104ef_104fb,

			      ARRAY_SIZE(adcmap_100k_104ef_104fb),

			      voltage, &result);

	result *= 1000;

	*result_mdec = result;



	return 0;

}



static int vadc_scale_die_temp(struct vadc_priv *vadc,

			       const struct vadc_channel_prop *prop,

			       u16 adc_code, int *result_mdec)

{

	const struct vadc_prescale_ratio *prescale;

	s64 voltage = 0;

	u64 temp; /* Temporary variable for do_div */



	vadc_scale_calib(vadc, adc_code, prop, &voltage);



	if (voltage > 0) {

		prescale = &vadc_prescale_ratios[prop->prescale];

		temp = voltage * prescale->den;

		do_div(temp, prescale->num * 2);

		voltage = temp;

	} else {

		voltage = 0;

	}



	voltage -= KELVINMIL_CELSIUSMIL;

	*result_mdec = voltage;



	return 0;

}



static int vadc_scale_chg_temp(struct vadc_priv *vadc,

			       const struct vadc_channel_prop *prop,

			       u16 adc_code, int *result_mdec)

{

	const struct vadc_prescale_ratio *prescale;

	s64 voltage = 0, result = 0;



	vadc_scale_calib(vadc, adc_code, prop, &voltage);



	prescale = &vadc_prescale_ratios[prop->prescale];

	voltage = voltage * prescale->den;

	voltage = div64_s64(voltage, prescale->num);

	voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));

	voltage = (voltage + PMI_CHG_SCALE_2);

	result =  div64_s64(voltage, 1000000);

	*result_mdec = result;



	return 0;

}



static int vadc_decimation_from_dt(u32 value)

{

	if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||

	    value > VADC_DECIMATION_MAX)

		return -EINVAL;



	return __ffs64(value / VADC_DECIMATION_MIN);

}



static int vadc_prescaling_from_dt(u32 num, u32 den)

{

	unsigned int pre;
@@ -742,14 +449,6 @@ static int vadc_avg_samples_from_dt(u32 value) 
	return __ffs64(value);

}



static struct vadc_scale_fn scale_fn[] = {

	[SCALE_DEFAULT] = {vadc_scale_volt},

	[SCALE_THERM_100K_PULLUP] = {vadc_scale_therm},

	[SCALE_PMIC_THERM] = {vadc_scale_die_temp},

	[SCALE_XOTHERM] = {vadc_scale_therm},

	[SCALE_PMI_CHG_TEMP] = {vadc_scale_chg_temp},

};



static int vadc_read_raw(struct iio_dev *indio_dev,

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

			 long mask)
@@ -766,7 +465,13 @@ static int vadc_read_raw(struct iio_dev *indio_dev, 
		if (ret)

			break;



		scale_fn[prop->scale_fn].scale(vadc, prop, adc_code, val);

		ret = qcom_vadc_scale(prop->scale_fn_type,

				&vadc->graph[prop->calibration],

				&vadc_prescale_ratios[prop->prescale],

				(prop->calibration == VADC_CALIB_ABSOLUTE),

				adc_code, val);

		if (ret)

			break;



		return IIO_VAL_INT;

	case IIO_CHAN_INFO_RAW:
@@ -809,7 +514,7 @@ struct vadc_channels { 
	unsigned int prescale_index;

	enum iio_chan_type type;

	long info_mask;

	unsigned int scale_fn;

	enum vadc_scale_fn_type scale_fn_type;

};



#define VADC_CHAN(_dname, _type, _mask, _pre, _scale)			\
@@ -818,7 +523,7 @@ struct vadc_channels { 
		.prescale_index = _pre,					\

		.type = _type,						\

		.info_mask = _mask,					\

		.scale_fn = _scale					\

		.scale_fn_type = _scale					\

	},								\



#define VADC_NO_CHAN(_dname, _type, _mask, _pre)			\
@@ -976,7 +681,7 @@ static int vadc_get_dt_channel_data(struct device *dev, 


	ret = of_property_read_u32(node, "qcom,decimation", &value);

	if (!ret) {

		ret = vadc_decimation_from_dt(value);

		ret = qcom_vadc_decimation_from_dt(value);

		if (ret < 0) {

			dev_err(dev, "%02x invalid decimation %d\n",

				chan, value);
@@ -1068,7 +773,7 @@ static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node) 
			return ret;

		}



		prop.scale_fn = vadc_chans[prop.channel].scale_fn;

		prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type;

		vadc->chan_props[index] = prop;



		vadc_chan = &vadc_chans[prop.channel];

drivers/iio/adc/qcom-vadc-common.c

0 → 100644
+230 −0
Original line number Diff line number Diff line 
#include <linux/bug.h>

#include <linux/kernel.h>

#include <linux/bitops.h>

#include <linux/math64.h>

#include <linux/log2.h>

#include <linux/err.h>



#include "qcom-vadc-common.h"



/* Voltage to temperature */

static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {

	{1758,	-40},

	{1742,	-35},

	{1719,	-30},

	{1691,	-25},

	{1654,	-20},

	{1608,	-15},

	{1551,	-10},

	{1483,	-5},

	{1404,	0},

	{1315,	5},

	{1218,	10},

	{1114,	15},

	{1007,	20},

	{900,	25},

	{795,	30},

	{696,	35},

	{605,	40},

	{522,	45},

	{448,	50},

	{383,	55},

	{327,	60},

	{278,	65},

	{237,	70},

	{202,	75},

	{172,	80},

	{146,	85},

	{125,	90},

	{107,	95},

	{92,	100},

	{79,	105},

	{68,	110},

	{59,	115},

	{51,	120},

	{44,	125}

};



static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,

				      u32 tablesize, s32 input, s64 *output)

{

	bool descending = 1;

	u32 i = 0;



	if (!pts)

		return -EINVAL;



	/* Check if table is descending or ascending */

	if (tablesize > 1) {

		if (pts[0].x < pts[1].x)

			descending = 0;

	}



	while (i < tablesize) {

		if ((descending) && (pts[i].x < input)) {

			/* table entry is less than measured*/

			 /* value and table is descending, stop */

			break;

		} else if ((!descending) &&

				(pts[i].x > input)) {

			/* table entry is greater than measured*/

			/*value and table is ascending, stop */

			break;

		}

		i++;

	}



	if (i == 0) {

		*output = pts[0].y;

	} else if (i == tablesize) {

		*output = pts[tablesize - 1].y;

	} else {

		/* result is between search_index and search_index-1 */

		/* interpolate linearly */

		*output = (((s32)((pts[i].y - pts[i - 1].y) *

			(input - pts[i - 1].x)) /

			(pts[i].x - pts[i - 1].x)) +

			pts[i - 1].y);

	}



	return 0;

}



static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,

				  u16 adc_code,

				  bool absolute,

				  s64 *scale_voltage)

{

	*scale_voltage = (adc_code - calib_graph->gnd);

	*scale_voltage *= calib_graph->dx;

	*scale_voltage = div64_s64(*scale_voltage, calib_graph->dy);

	if (absolute)

		*scale_voltage += calib_graph->dx;



	if (*scale_voltage < 0)

		*scale_voltage = 0;

}



static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,

				const struct vadc_prescale_ratio *prescale,

				bool absolute, u16 adc_code,

				int *result_uv)

{

	s64 voltage = 0, result = 0;



	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);



	voltage = voltage * prescale->den;

	result = div64_s64(voltage, prescale->num);

	*result_uv = result;



	return 0;

}



static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,

				 const struct vadc_prescale_ratio *prescale,

				 bool absolute, u16 adc_code,

				 int *result_mdec)

{

	s64 voltage = 0, result = 0;

	int ret;



	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);



	if (absolute)

		voltage = div64_s64(voltage, 1000);



	ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,

					 ARRAY_SIZE(adcmap_100k_104ef_104fb),

					 voltage, &result);

	if (ret)

		return ret;



	result *= 1000;

	*result_mdec = result;



	return 0;

}



static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,

				    const struct vadc_prescale_ratio *prescale,

				    bool absolute,

				    u16 adc_code, int *result_mdec)

{

	s64 voltage = 0;

	u64 temp; /* Temporary variable for do_div */



	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);



	if (voltage > 0) {

		temp = voltage * prescale->den;

		do_div(temp, prescale->num * 2);

		voltage = temp;

	} else {

		voltage = 0;

	}



	voltage -= KELVINMIL_CELSIUSMIL;

	*result_mdec = voltage;



	return 0;

}



static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,

				    const struct vadc_prescale_ratio *prescale,

				    bool absolute,

				    u16 adc_code, int *result_mdec)

{

	s64 voltage = 0, result = 0;



	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);



	voltage = voltage * prescale->den;

	voltage = div64_s64(voltage, prescale->num);

	voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));

	voltage = (voltage + PMI_CHG_SCALE_2);

	result =  div64_s64(voltage, 1000000);

	*result_mdec = result;



	return 0;

}



int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,

		    const struct vadc_linear_graph *calib_graph,

		    const struct vadc_prescale_ratio *prescale,

		    bool absolute,

		    u16 adc_code, int *result)

{

	switch (scaletype) {

	case SCALE_DEFAULT:

		return qcom_vadc_scale_volt(calib_graph, prescale,

					    absolute, adc_code,

					    result);

	case SCALE_THERM_100K_PULLUP:

	case SCALE_XOTHERM:

		return qcom_vadc_scale_therm(calib_graph, prescale,

					     absolute, adc_code,

					     result);

	case SCALE_PMIC_THERM:

		return qcom_vadc_scale_die_temp(calib_graph, prescale,

						absolute, adc_code,

						result);

	case SCALE_PMI_CHG_TEMP:

		return qcom_vadc_scale_chg_temp(calib_graph, prescale,

						absolute, adc_code,

						result);

	default:

		return -EINVAL;

	}

}

EXPORT_SYMBOL(qcom_vadc_scale);



int qcom_vadc_decimation_from_dt(u32 value)

{

	if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||

	    value > VADC_DECIMATION_MAX)

		return -EINVAL;



	return __ffs64(value / VADC_DECIMATION_MIN);

}

EXPORT_SYMBOL(qcom_vadc_decimation_from_dt);

drivers/iio/adc/qcom-vadc-common.h

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Original line number Diff line number Diff line 
/*

 * Code shared between the different Qualcomm PMIC voltage ADCs

 */



#ifndef QCOM_VADC_COMMON_H

#define QCOM_VADC_COMMON_H



#define VADC_CONV_TIME_MIN_US			2000

#define VADC_CONV_TIME_MAX_US			2100



/* Min ADC code represents 0V */

#define VADC_MIN_ADC_CODE			0x6000

/* Max ADC code represents full-scale range of 1.8V */

#define VADC_MAX_ADC_CODE			0xa800



#define VADC_ABSOLUTE_RANGE_UV			625000

#define VADC_RATIOMETRIC_RANGE			1800



#define VADC_DEF_PRESCALING			0 /* 1:1 */

#define VADC_DEF_DECIMATION			0 /* 512 */

#define VADC_DEF_HW_SETTLE_TIME			0 /* 0 us */

#define VADC_DEF_AVG_SAMPLES			0 /* 1 sample */

#define VADC_DEF_CALIB_TYPE			VADC_CALIB_ABSOLUTE



#define VADC_DECIMATION_MIN			512

#define VADC_DECIMATION_MAX			4096



#define VADC_HW_SETTLE_DELAY_MAX		10000

#define VADC_AVG_SAMPLES_MAX			512



#define KELVINMIL_CELSIUSMIL			273150



#define PMI_CHG_SCALE_1				-138890

#define PMI_CHG_SCALE_2				391750000000LL



/**

 * struct vadc_map_pt - Map the graph representation for ADC channel

 * @x: Represent the ADC digitized code.

 * @y: Represent the physical data which can be temperature, voltage,

 *     resistance.

 */

struct vadc_map_pt {

	s32 x;

	s32 y;

};



/*

 * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.

 * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for

 * calibration.

 */

enum vadc_calibration {

	VADC_CALIB_ABSOLUTE = 0,

	VADC_CALIB_RATIOMETRIC

};



/**

 * struct vadc_linear_graph - Represent ADC characteristics.

 * @dy: numerator slope to calculate the gain.

 * @dx: denominator slope to calculate the gain.

 * @gnd: A/D word of the ground reference used for the channel.

 *

 * Each ADC device has different offset and gain parameters which are

 * computed to calibrate the device.

 */

struct vadc_linear_graph {

	s32 dy;

	s32 dx;

	s32 gnd;

};



/**

 * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.

 * @num: the inverse numerator of the gain applied to the input channel.

 * @den: the inverse denominator of the gain applied to the input channel.

 */

struct vadc_prescale_ratio {

	u32 num;

	u32 den;

};



/**

 * enum vadc_scale_fn_type - Scaling function to convert ADC code to

 *				physical scaled units for the channel.

 * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).

 * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.

 *				 Uses a mapping table with 100K pullup.

 * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.

 * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.

 * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp

 */

enum vadc_scale_fn_type {

	SCALE_DEFAULT = 0,

	SCALE_THERM_100K_PULLUP,

	SCALE_PMIC_THERM,

	SCALE_XOTHERM,

	SCALE_PMI_CHG_TEMP,

};



int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,

		    const struct vadc_linear_graph *calib_graph,

		    const struct vadc_prescale_ratio *prescale,

		    bool absolute,

		    u16 adc_code, int *result_mdec);



int qcom_vadc_decimation_from_dt(u32 value);



#endif /* QCOM_VADC_COMMON_H */

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