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linux/drivers/iio/adc/qcom-vadc-common.c
Jishnu Prakash 238e34ad7d iio: adc: qcom-vadc-common: add reverse scaling for PMIC5 Gen2 ADC_TM 
Add reverse scaling function for PMIC5 Gen2 ADC_TM, to convert
temperature to raw ADC code, for setting thresholds for
thermistor channels.

Signed-off-by: Jishnu Prakash <quic_jprakash@quicinc.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/1648991869-20899-3-git-send-email-quic_jprakash@quicinc.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2022-05-19 12:11:51 +02:00

773 lines
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/fixp-arith.h>
#include <linux/iio/adc/qcom-vadc-common.h>
#include <linux/math64.h>
#include <linux/log2.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/units.h>
/**
* 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;
};
/* Voltage to temperature */
static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
{1758, -40000 },
{1742, -35000 },
{1719, -30000 },
{1691, -25000 },
{1654, -20000 },
{1608, -15000 },
{1551, -10000 },
{1483, -5000 },
{1404, 0 },
{1315, 5000 },
{1218, 10000 },
{1114, 15000 },
{1007, 20000 },
{900, 25000 },
{795, 30000 },
{696, 35000 },
{605, 40000 },
{522, 45000 },
{448, 50000 },
{383, 55000 },
{327, 60000 },
{278, 65000 },
{237, 70000 },
{202, 75000 },
{172, 80000 },
{146, 85000 },
{125, 90000 },
{107, 95000 },
{92, 100000 },
{79, 105000 },
{68, 110000 },
{59, 115000 },
{51, 120000 },
{44, 125000 }
};
/*
* Voltage to temperature table for 100k pull up for NTCG104EF104 with
* 1.875V reference.
*/
static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = {
{ 1831, -40000 },
{ 1814, -35000 },
{ 1791, -30000 },
{ 1761, -25000 },
{ 1723, -20000 },
{ 1675, -15000 },
{ 1616, -10000 },
{ 1545, -5000 },
{ 1463, 0 },
{ 1370, 5000 },
{ 1268, 10000 },
{ 1160, 15000 },
{ 1049, 20000 },
{ 937, 25000 },
{ 828, 30000 },
{ 726, 35000 },
{ 630, 40000 },
{ 544, 45000 },
{ 467, 50000 },
{ 399, 55000 },
{ 340, 60000 },
{ 290, 65000 },
{ 247, 70000 },
{ 209, 75000 },
{ 179, 80000 },
{ 153, 85000 },
{ 130, 90000 },
{ 112, 95000 },
{ 96, 100000 },
{ 82, 105000 },
{ 71, 110000 },
{ 62, 115000 },
{ 53, 120000 },
{ 46, 125000 },
};
static const struct vadc_map_pt adcmap7_die_temp[] = {
{ 857300, 160000 },
{ 820100, 140000 },
{ 782500, 120000 },
{ 744600, 100000 },
{ 706400, 80000 },
{ 667900, 60000 },
{ 629300, 40000 },
{ 590500, 20000 },
{ 551500, 0 },
{ 512400, -20000 },
{ 473100, -40000 },
{ 433700, -60000 },
};
/*
* Resistance to temperature table for 100k pull up for NTCG104EF104.
*/
static const struct vadc_map_pt adcmap7_100k[] = {
{ 4250657, -40960 },
{ 3962085, -39936 },
{ 3694875, -38912 },
{ 3447322, -37888 },
{ 3217867, -36864 },
{ 3005082, -35840 },
{ 2807660, -34816 },
{ 2624405, -33792 },
{ 2454218, -32768 },
{ 2296094, -31744 },
{ 2149108, -30720 },
{ 2012414, -29696 },
{ 1885232, -28672 },
{ 1766846, -27648 },
{ 1656598, -26624 },
{ 1553884, -25600 },
{ 1458147, -24576 },
{ 1368873, -23552 },
{ 1285590, -22528 },
{ 1207863, -21504 },
{ 1135290, -20480 },
{ 1067501, -19456 },
{ 1004155, -18432 },
{ 944935, -17408 },
{ 889550, -16384 },
{ 837731, -15360 },
{ 789229, -14336 },
{ 743813, -13312 },
{ 701271, -12288 },
{ 661405, -11264 },
{ 624032, -10240 },
{ 588982, -9216 },
{ 556100, -8192 },
{ 525239, -7168 },
{ 496264, -6144 },
{ 469050, -5120 },
{ 443480, -4096 },
{ 419448, -3072 },
{ 396851, -2048 },
{ 375597, -1024 },
{ 355598, 0 },
{ 336775, 1024 },
{ 319052, 2048 },
{ 302359, 3072 },
{ 286630, 4096 },
{ 271806, 5120 },
{ 257829, 6144 },
{ 244646, 7168 },
{ 232209, 8192 },
{ 220471, 9216 },
{ 209390, 10240 },
{ 198926, 11264 },
{ 189040, 12288 },
{ 179698, 13312 },
{ 170868, 14336 },
{ 162519, 15360 },
{ 154622, 16384 },
{ 147150, 17408 },
{ 140079, 18432 },
{ 133385, 19456 },
{ 127046, 20480 },
{ 121042, 21504 },
{ 115352, 22528 },
{ 109960, 23552 },
{ 104848, 24576 },
{ 100000, 25600 },
{ 95402, 26624 },
{ 91038, 27648 },
{ 86897, 28672 },
{ 82965, 29696 },
{ 79232, 30720 },
{ 75686, 31744 },
{ 72316, 32768 },
{ 69114, 33792 },
{ 66070, 34816 },
{ 63176, 35840 },
{ 60423, 36864 },
{ 57804, 37888 },
{ 55312, 38912 },
{ 52940, 39936 },
{ 50681, 40960 },
{ 48531, 41984 },
{ 46482, 43008 },
{ 44530, 44032 },
{ 42670, 45056 },
{ 40897, 46080 },
{ 39207, 47104 },
{ 37595, 48128 },
{ 36057, 49152 },
{ 34590, 50176 },
{ 33190, 51200 },
{ 31853, 52224 },
{ 30577, 53248 },
{ 29358, 54272 },
{ 28194, 55296 },
{ 27082, 56320 },
{ 26020, 57344 },
{ 25004, 58368 },
{ 24033, 59392 },
{ 23104, 60416 },
{ 22216, 61440 },
{ 21367, 62464 },
{ 20554, 63488 },
{ 19776, 64512 },
{ 19031, 65536 },
{ 18318, 66560 },
{ 17636, 67584 },
{ 16982, 68608 },
{ 16355, 69632 },
{ 15755, 70656 },
{ 15180, 71680 },
{ 14628, 72704 },
{ 14099, 73728 },
{ 13592, 74752 },
{ 13106, 75776 },
{ 12640, 76800 },
{ 12192, 77824 },
{ 11762, 78848 },
{ 11350, 79872 },
{ 10954, 80896 },
{ 10574, 81920 },
{ 10209, 82944 },
{ 9858, 83968 },
{ 9521, 84992 },
{ 9197, 86016 },
{ 8886, 87040 },
{ 8587, 88064 },
{ 8299, 89088 },
{ 8023, 90112 },
{ 7757, 91136 },
{ 7501, 92160 },
{ 7254, 93184 },
{ 7017, 94208 },
{ 6789, 95232 },
{ 6570, 96256 },
{ 6358, 97280 },
{ 6155, 98304 },
{ 5959, 99328 },
{ 5770, 100352 },
{ 5588, 101376 },
{ 5412, 102400 },
{ 5243, 103424 },
{ 5080, 104448 },
{ 4923, 105472 },
{ 4771, 106496 },
{ 4625, 107520 },
{ 4484, 108544 },
{ 4348, 109568 },
{ 4217, 110592 },
{ 4090, 111616 },
{ 3968, 112640 },
{ 3850, 113664 },
{ 3736, 114688 },
{ 3626, 115712 },
{ 3519, 116736 },
{ 3417, 117760 },
{ 3317, 118784 },
{ 3221, 119808 },
{ 3129, 120832 },
{ 3039, 121856 },
{ 2952, 122880 },
{ 2868, 123904 },
{ 2787, 124928 },
{ 2709, 125952 },
{ 2633, 126976 },
{ 2560, 128000 },
{ 2489, 129024 },
{ 2420, 130048 }
};
static const struct u32_fract adc5_prescale_ratios[] = {
{ .numerator = 1, .denominator = 1 },
{ .numerator = 1, .denominator = 3 },
{ .numerator = 1, .denominator = 4 },
{ .numerator = 1, .denominator = 6 },
{ .numerator = 1, .denominator = 20 },
{ .numerator = 1, .denominator = 8 },
{ .numerator = 10, .denominator = 81 },
{ .numerator = 1, .denominator = 10 },
{ .numerator = 1, .denominator = 16 },
};
static int qcom_vadc_scale_hw_calib_volt(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_uv);
static int qcom_vadc_scale_hw_calib_therm(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc7_scale_hw_calib_therm(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_smb_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_chg5_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_calib_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc7_scale_hw_calib_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static struct qcom_adc5_scale_type scale_adc5_fn[] = {
[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
[SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm},
[SCALE_HW_CALIB_THERM_100K_PU_PM7] = {
qcom_vadc7_scale_hw_calib_therm},
[SCALE_HW_CALIB_PMIC_THERM] = {qcom_vadc_scale_hw_calib_die_temp},
[SCALE_HW_CALIB_PMIC_THERM_PM7] = {
qcom_vadc7_scale_hw_calib_die_temp},
[SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp},
[SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp},
};
static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
u32 tablesize, s32 input, int *output)
{
u32 i = 0;
if (!pts)
return -EINVAL;
while (i < tablesize && pts[i].x > input)
i++;
if (i == 0) {
*output = pts[0].y;
} else if (i == tablesize) {
*output = pts[tablesize - 1].y;
} else {
/* interpolate linearly */
*output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y,
pts[i].x, pts[i].y,
input);
}
return 0;
}
static s32 qcom_vadc_map_temp_voltage(const struct vadc_map_pt *pts,
u32 tablesize, int input)
{
u32 i = 0;
/*
* Table must be sorted, find the interval of 'y' which contains value
* 'input' and map it to proper 'x' value
*/
while (i < tablesize && pts[i].y < input)
i++;
if (i == 0)
return pts[0].x;
if (i == tablesize)
return pts[tablesize - 1].x;
/* interpolate linearly */
return fixp_linear_interpolate(pts[i - 1].y, pts[i - 1].x,
pts[i].y, pts[i].x, input);
}
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 u32_fract *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 *= prescale->denominator;
result = div64_s64(voltage, prescale->numerator);
*result_uv = result;
return 0;
}
static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
const struct u32_fract *prescale,
bool absolute, u16 adc_code,
int *result_mdec)
{
s64 voltage = 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_mdec);
if (ret)
return ret;
return 0;
}
static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
const struct u32_fract *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->denominator;
do_div(temp, prescale->numerator * 2);
voltage = temp;
} else {
voltage = 0;
}
*result_mdec = milli_kelvin_to_millicelsius(voltage);
return 0;
}
static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
const struct u32_fract *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 *= prescale->denominator;
voltage = div64_s64(voltage, prescale->numerator);
voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
voltage = (voltage + PMI_CHG_SCALE_2);
result = div64_s64(voltage, 1000000);
*result_mdec = result;
return 0;
}
/* convert voltage to ADC code, using 1.875V reference */
static u16 qcom_vadc_scale_voltage_code(s32 voltage,
const struct u32_fract *prescale,
const u32 full_scale_code_volt,
unsigned int factor)
{
s64 volt = voltage;
s64 adc_vdd_ref_mv = 1875; /* reference voltage */
volt *= prescale->numerator * factor * full_scale_code_volt;
volt = div64_s64(volt, (s64)prescale->denominator * adc_vdd_ref_mv * 1000);
return volt;
}
static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
const struct u32_fract *prescale,
const struct adc5_data *data,
unsigned int factor)
{
s64 voltage, temp, adc_vdd_ref_mv = 1875;
/*
* The normal data range is between 0V to 1.875V. On cases where
* we read low voltage values, the ADC code can go beyond the
* range and the scale result is incorrect so we clamp the values
* for the cases where the code represents a value below 0V
*/
if (adc_code > VADC5_MAX_CODE)
adc_code = 0;
/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;
voltage = div64_s64(voltage, data->full_scale_code_volt);
if (voltage > 0) {
voltage *= prescale->denominator;
temp = prescale->numerator * factor;
voltage = div64_s64(voltage, temp);
} else {
voltage = 0;
}
return (int) voltage;
}
static int qcom_vadc7_scale_hw_calib_therm(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
s64 resistance = adc_code;
int ret, result;
if (adc_code >= RATIO_MAX_ADC7)
return -EINVAL;
/* (ADC code * R_PULLUP (100Kohm)) / (full_scale_code - ADC code)*/
resistance *= R_PU_100K;
resistance = div64_s64(resistance, RATIO_MAX_ADC7 - adc_code);
ret = qcom_vadc_map_voltage_temp(adcmap7_100k,
ARRAY_SIZE(adcmap7_100k),
resistance, &result);
if (ret)
return ret;
*result_mdec = result;
return 0;
}
static int qcom_vadc_scale_hw_calib_volt(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_uv)
{
*result_uv = qcom_vadc_scale_code_voltage_factor(adc_code,
prescale, data, 1);
return 0;
}
static int qcom_vadc_scale_hw_calib_therm(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
int voltage;
voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
prescale, data, 1000);
/* Map voltage to temperature from look-up table */
return qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb_1875_vref,
ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
voltage, result_mdec);
}
static int qcom_vadc_scale_hw_calib_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
prescale, data, 2);
*result_mdec = milli_kelvin_to_millicelsius(*result_mdec);
return 0;
}
static int qcom_vadc7_scale_hw_calib_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
int voltage;
voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
prescale, data, 1);
return qcom_vadc_map_voltage_temp(adcmap7_die_temp, ARRAY_SIZE(adcmap7_die_temp),
voltage, result_mdec);
}
static int qcom_vadc_scale_hw_smb_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code * 100,
prescale, data, PMIC5_SMB_TEMP_SCALE_FACTOR);
*result_mdec = PMIC5_SMB_TEMP_CONSTANT - *result_mdec;
return 0;
}
static int qcom_vadc_scale_hw_chg5_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
prescale, data, 4);
*result_mdec = PMIC5_CHG_TEMP_SCALE_FACTOR - *result_mdec;
return 0;
}
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)
{
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);
u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
u32 full_scale_code_volt, int temp)
{
const struct u32_fract *prescale = &adc5_prescale_ratios[prescale_ratio];
s32 voltage;
voltage = qcom_vadc_map_temp_voltage(adcmap_100k_104ef_104fb_1875_vref,
ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
temp);
return qcom_vadc_scale_voltage_code(voltage, prescale, full_scale_code_volt, 1000);
}
EXPORT_SYMBOL(qcom_adc_tm5_temp_volt_scale);
u16 qcom_adc_tm5_gen2_temp_res_scale(int temp)
{
int64_t resistance;
resistance = qcom_vadc_map_temp_voltage(adcmap7_100k,
ARRAY_SIZE(adcmap7_100k), temp);
return div64_s64(resistance * RATIO_MAX_ADC7, resistance + R_PU_100K);
}
EXPORT_SYMBOL(qcom_adc_tm5_gen2_temp_res_scale);
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)
{
const struct u32_fract *prescale = &adc5_prescale_ratios[prescale_ratio];
if (!(scaletype >= SCALE_HW_CALIB_DEFAULT &&
scaletype < SCALE_HW_CALIB_INVALID)) {
pr_err("Invalid scale type %d\n", scaletype);
return -EINVAL;
}
return scale_adc5_fn[scaletype].scale_fn(prescale, data,
adc_code, result);
}
EXPORT_SYMBOL(qcom_adc5_hw_scale);
int qcom_adc5_prescaling_from_dt(u32 numerator, u32 denominator)
{
unsigned int pre;
for (pre = 0; pre < ARRAY_SIZE(adc5_prescale_ratios); pre++)
if (adc5_prescale_ratios[pre].numerator == numerator &&
adc5_prescale_ratios[pre].denominator == denominator)
break;
if (pre == ARRAY_SIZE(adc5_prescale_ratios))
return -EINVAL;
return pre;
}
EXPORT_SYMBOL(qcom_adc5_prescaling_from_dt);
int qcom_adc5_hw_settle_time_from_dt(u32 value,
const unsigned int *hw_settle)
{
unsigned int i;
for (i = 0; i < VADC_HW_SETTLE_SAMPLES_MAX; i++) {
if (value == hw_settle[i])
return i;
}
return -EINVAL;
}
EXPORT_SYMBOL(qcom_adc5_hw_settle_time_from_dt);
int qcom_adc5_avg_samples_from_dt(u32 value)
{
if (!is_power_of_2(value) || value > ADC5_AVG_SAMPLES_MAX)
return -EINVAL;
return __ffs(value);
}
EXPORT_SYMBOL(qcom_adc5_avg_samples_from_dt);
int qcom_adc5_decimation_from_dt(u32 value, const unsigned int *decimation)
{
unsigned int i;
for (i = 0; i < ADC5_DECIMATION_SAMPLES_MAX; i++) {
if (value == decimation[i])
return i;
}
return -EINVAL;
}
EXPORT_SYMBOL(qcom_adc5_decimation_from_dt);
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);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm ADC common functionality");
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