mirror of https://gitee.com/openkylin/linux.git
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/* 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
|
|
|
|
#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 */
|