/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Code shared between the different Qualcomm PMIC voltage ADCs
 */

#ifndef QCOM_VADC_COMMON_H
#define QCOM_VADC_COMMON_H

#include <linux/math.h>
#include <linux/types.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 ADC5_DEF_VBAT_PRESCALING                1 /* 1:3 */
#define ADC5_DECIMATION_SHORT                   250
#define ADC5_DECIMATION_MEDIUM                  420
#define ADC5_DECIMATION_LONG                    840
/* Default decimation - 1024 for rev2, 840 for pmic5 */
#define ADC5_DECIMATION_DEFAULT                 2
#define ADC5_DECIMATION_SAMPLES_MAX             3

#define VADC_HW_SETTLE_DELAY_MAX                10000
#define VADC_HW_SETTLE_SAMPLES_MAX              16
#define VADC_AVG_SAMPLES_MAX                    512
#define ADC5_AVG_SAMPLES_MAX                    16

#define PMIC5_CHG_TEMP_SCALE_FACTOR             377500
#define PMIC5_SMB_TEMP_CONSTANT                 419400
#define PMIC5_SMB_TEMP_SCALE_FACTOR             356

#define PMI_CHG_SCALE_1                         -138890
#define PMI_CHG_SCALE_2                         391750000000LL

#define VADC5_MAX_CODE                          0x7fff
#define ADC5_FULL_SCALE_CODE                    0x70e4
#define ADC5_USR_DATA_CHECK                     0x8000

#define R_PU_100K                               100000
#define RATIO_MAX_ADC7                          BIT(14)

/*
 * 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;
};

/**
 * 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
 * @SCALE_HW_CALIB_DEFAULT: Default scaling to convert raw adc code to
 *      voltage (uV) with hardware applied offset/slope values to adc code.
 * @SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using
 *      lookup table. The hardware applies offset/slope to adc code.
 * @SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using
 *      100k pullup. The hardware applies offset/slope to adc code.
 * @SCALE_HW_CALIB_THERM_100K_PU_PM7: Returns temperature in millidegC using
 *      lookup table for PMIC7. The hardware applies offset/slope to adc code.
 * @SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
 *      The hardware applies offset/slope to adc code.
 * @SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
 *      The hardware applies offset/slope to adc code. This is for PMIC7.
 * @SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5
 *      charger temperature.
 * @SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5
 *      SMB1390 temperature.
 */
enum vadc_scale_fn_type {
        SCALE_DEFAULT = 0,
        SCALE_THERM_100K_PULLUP,
        SCALE_PMIC_THERM,
        SCALE_XOTHERM,
        SCALE_PMI_CHG_TEMP,
        SCALE_HW_CALIB_DEFAULT,
        SCALE_HW_CALIB_THERM_100K_PULLUP,
        SCALE_HW_CALIB_XOTHERM,
        SCALE_HW_CALIB_THERM_100K_PU_PM7,
        SCALE_HW_CALIB_PMIC_THERM,
        SCALE_HW_CALIB_PMIC_THERM_PM7,
        SCALE_HW_CALIB_PM5_CHG_TEMP,
        SCALE_HW_CALIB_PM5_SMB_TEMP,
        /* private: */
        SCALE_HW_CALIB_INVALID,
};

struct adc5_data {
        const u32       full_scale_code_volt;
        const u32       full_scale_code_cur;
        const struct adc5_channels *adc_chans;
        const struct iio_info *info;
        unsigned int    *decimation;
        unsigned int    *hw_settle_1;
        unsigned int    *hw_settle_2;
};

int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
                    const struct vadc_linear_graph *calib_graph,
                    const struct u32_fract *prescale,
                    bool absolute,
                    u16 adc_code, int *result_mdec);

struct qcom_adc5_scale_type {
        int (*scale_fn)(const struct u32_fract *prescale,
                const struct adc5_data *data, u16 adc_code, int *result);
};

int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
                    unsigned int prescale_ratio,
                    const struct adc5_data *data,
                    u16 adc_code, int *result_mdec);

u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
                                 u32 full_scale_code_volt, int temp);

u16 qcom_adc_tm5_gen2_temp_res_scale(int temp);

int qcom_adc5_prescaling_from_dt(u32 num, u32 den);

int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle);

int qcom_adc5_avg_samples_from_dt(u32 value);

int qcom_adc5_decimation_from_dt(u32 value, const unsigned int *decimation);

int qcom_vadc_decimation_from_dt(u32 value);

#endif /* QCOM_VADC_COMMON_H */