110 lines
3 KiB
C
110 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Code shared between the different Qualcomm PMIC voltage ADCs
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*/
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#ifndef QCOM_VADC_COMMON_H
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#define QCOM_VADC_COMMON_H
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#define VADC_CONV_TIME_MIN_US 2000
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#define VADC_CONV_TIME_MAX_US 2100
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/* Min ADC code represents 0V */
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#define VADC_MIN_ADC_CODE 0x6000
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/* Max ADC code represents full-scale range of 1.8V */
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#define VADC_MAX_ADC_CODE 0xa800
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#define VADC_ABSOLUTE_RANGE_UV 625000
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#define VADC_RATIOMETRIC_RANGE 1800
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#define VADC_DEF_PRESCALING 0 /* 1:1 */
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#define VADC_DEF_DECIMATION 0 /* 512 */
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#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */
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#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */
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#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE
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#define VADC_DECIMATION_MIN 512
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#define VADC_DECIMATION_MAX 4096
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#define VADC_HW_SETTLE_DELAY_MAX 10000
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#define VADC_AVG_SAMPLES_MAX 512
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#define KELVINMIL_CELSIUSMIL 273150
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#define PMI_CHG_SCALE_1 -138890
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#define PMI_CHG_SCALE_2 391750000000LL
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/**
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* struct vadc_map_pt - Map the graph representation for ADC channel
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* @x: Represent the ADC digitized code.
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* @y: Represent the physical data which can be temperature, voltage,
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* resistance.
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*/
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struct vadc_map_pt {
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s32 x;
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s32 y;
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};
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/*
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* VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.
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* VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for
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* calibration.
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*/
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enum vadc_calibration {
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VADC_CALIB_ABSOLUTE = 0,
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VADC_CALIB_RATIOMETRIC
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};
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/**
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* struct vadc_linear_graph - Represent ADC characteristics.
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* @dy: numerator slope to calculate the gain.
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* @dx: denominator slope to calculate the gain.
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* @gnd: A/D word of the ground reference used for the channel.
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*
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* Each ADC device has different offset and gain parameters which are
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* computed to calibrate the device.
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*/
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struct vadc_linear_graph {
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s32 dy;
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s32 dx;
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s32 gnd;
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};
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/**
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* struct vadc_prescale_ratio - Represent scaling ratio for ADC input.
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* @num: the inverse numerator of the gain applied to the input channel.
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* @den: the inverse denominator of the gain applied to the input channel.
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*/
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struct vadc_prescale_ratio {
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u32 num;
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u32 den;
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};
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/**
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* enum vadc_scale_fn_type - Scaling function to convert ADC code to
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* physical scaled units for the channel.
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* SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).
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* SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.
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* Uses a mapping table with 100K pullup.
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* SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
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* SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
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* SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
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*/
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enum vadc_scale_fn_type {
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SCALE_DEFAULT = 0,
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SCALE_THERM_100K_PULLUP,
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SCALE_PMIC_THERM,
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SCALE_XOTHERM,
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SCALE_PMI_CHG_TEMP,
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};
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int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
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const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result_mdec);
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int qcom_vadc_decimation_from_dt(u32 value);
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#endif /* QCOM_VADC_COMMON_H */
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