1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Code shared between the different Qualcomm PMIC voltage ADCs 4 */ 5 6#ifndef QCOM_VADC_COMMON_H 7#define QCOM_VADC_COMMON_H 8 9#include <linux/math.h> 10#include <linux/types.h> 11 12#define VADC_CONV_TIME_MIN_US 2000 13#define VADC_CONV_TIME_MAX_US 2100 14 15/* Min ADC code represents 0V */ 16#define VADC_MIN_ADC_CODE 0x6000 17/* Max ADC code represents full-scale range of 1.8V */ 18#define VADC_MAX_ADC_CODE 0xa800 19 20#define VADC_ABSOLUTE_RANGE_UV 625000 21#define VADC_RATIOMETRIC_RANGE 1800 22 23#define VADC_DEF_PRESCALING 0 /* 1:1 */ 24#define VADC_DEF_DECIMATION 0 /* 512 */ 25#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */ 26#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */ 27#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE 28 29#define VADC_DECIMATION_MIN 512 30#define VADC_DECIMATION_MAX 4096 31#define ADC5_DEF_VBAT_PRESCALING 1 /* 1:3 */ 32#define ADC5_DECIMATION_SHORT 250 33#define ADC5_DECIMATION_MEDIUM 420 34#define ADC5_DECIMATION_LONG 840 35/* Default decimation - 1024 for rev2, 840 for pmic5 */ 36#define ADC5_DECIMATION_DEFAULT 2 37#define ADC5_DECIMATION_SAMPLES_MAX 3 38 39#define VADC_HW_SETTLE_DELAY_MAX 10000 40#define VADC_HW_SETTLE_SAMPLES_MAX 16 41#define VADC_AVG_SAMPLES_MAX 512 42#define ADC5_AVG_SAMPLES_MAX 16 43 44#define PMIC5_CHG_TEMP_SCALE_FACTOR 377500 45#define PMIC5_SMB_TEMP_CONSTANT 419400 46#define PMIC5_SMB_TEMP_SCALE_FACTOR 356 47 48#define PMI_CHG_SCALE_1 -138890 49#define PMI_CHG_SCALE_2 391750000000LL 50 51#define VADC5_MAX_CODE 0x7fff 52#define ADC5_FULL_SCALE_CODE 0x70e4 53#define ADC5_USR_DATA_CHECK 0x8000 54 55#define R_PU_100K 100000 56#define RATIO_MAX_ADC7 BIT(14) 57 58/* 59 * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels. 60 * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for 61 * calibration. 62 */ 63enum vadc_calibration { 64 VADC_CALIB_ABSOLUTE = 0, 65 VADC_CALIB_RATIOMETRIC 66}; 67 68/** 69 * struct vadc_linear_graph - Represent ADC characteristics. 70 * @dy: numerator slope to calculate the gain. 71 * @dx: denominator slope to calculate the gain. 72 * @gnd: A/D word of the ground reference used for the channel. 73 * 74 * Each ADC device has different offset and gain parameters which are 75 * computed to calibrate the device. 76 */ 77struct vadc_linear_graph { 78 s32 dy; 79 s32 dx; 80 s32 gnd; 81}; 82 83/** 84 * enum vadc_scale_fn_type - Scaling function to convert ADC code to 85 * physical scaled units for the channel. 86 * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV). 87 * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC. 88 * Uses a mapping table with 100K pullup. 89 * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade. 90 * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC. 91 * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp 92 * SCALE_HW_CALIB_DEFAULT: Default scaling to convert raw adc code to 93 * voltage (uV) with hardware applied offset/slope values to adc code. 94 * SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using 95 * lookup table. The hardware applies offset/slope to adc code. 96 * SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using 97 * 100k pullup. The hardware applies offset/slope to adc code. 98 * SCALE_HW_CALIB_THERM_100K_PU_PM7: Returns temperature in millidegC using 99 * lookup table for PMIC7. The hardware applies offset/slope to adc code. 100 * SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade. 101 * The hardware applies offset/slope to adc code. 102 * SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade. 103 * The hardware applies offset/slope to adc code. This is for PMIC7. 104 * SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5 105 * charger temperature. 106 * SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5 107 * SMB1390 temperature. 108 */ 109enum vadc_scale_fn_type { 110 SCALE_DEFAULT = 0, 111 SCALE_THERM_100K_PULLUP, 112 SCALE_PMIC_THERM, 113 SCALE_XOTHERM, 114 SCALE_PMI_CHG_TEMP, 115 SCALE_HW_CALIB_DEFAULT, 116 SCALE_HW_CALIB_THERM_100K_PULLUP, 117 SCALE_HW_CALIB_XOTHERM, 118 SCALE_HW_CALIB_THERM_100K_PU_PM7, 119 SCALE_HW_CALIB_PMIC_THERM, 120 SCALE_HW_CALIB_PMIC_THERM_PM7, 121 SCALE_HW_CALIB_PM5_CHG_TEMP, 122 SCALE_HW_CALIB_PM5_SMB_TEMP, 123 SCALE_HW_CALIB_INVALID, 124}; 125 126struct adc5_data { 127 const u32 full_scale_code_volt; 128 const u32 full_scale_code_cur; 129 const struct adc5_channels *adc_chans; 130 const struct iio_info *info; 131 unsigned int *decimation; 132 unsigned int *hw_settle_1; 133 unsigned int *hw_settle_2; 134}; 135 136int qcom_vadc_scale(enum vadc_scale_fn_type scaletype, 137 const struct vadc_linear_graph *calib_graph, 138 const struct u32_fract *prescale, 139 bool absolute, 140 u16 adc_code, int *result_mdec); 141 142struct qcom_adc5_scale_type { 143 int (*scale_fn)(const struct u32_fract *prescale, 144 const struct adc5_data *data, u16 adc_code, int *result); 145}; 146 147int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype, 148 unsigned int prescale_ratio, 149 const struct adc5_data *data, 150 u16 adc_code, int *result_mdec); 151 152u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio, 153 u32 full_scale_code_volt, int temp); 154 155u16 qcom_adc_tm5_gen2_temp_res_scale(int temp); 156 157int qcom_adc5_prescaling_from_dt(u32 num, u32 den); 158 159int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle); 160 161int qcom_adc5_avg_samples_from_dt(u32 value); 162 163int qcom_adc5_decimation_from_dt(u32 value, const unsigned int *decimation); 164 165int qcom_vadc_decimation_from_dt(u32 value); 166 167#endif /* QCOM_VADC_COMMON_H */ 168