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power: supply: ab8500: Use library interpolation

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The kernel already has a static inline for linear interpolation
so use that instead of rolling our own.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Linus Walleij 2021-07-13 17:27:05 +02:00 committed by Sebastian Reichel
parent e73f0f0ee7
commit f820547446
2 changed files with 11 additions and 9 deletions
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6
drivers/power/supply/ab8500_btemp.c
View file

@ -27,6 +27,7 @@
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/iio/consumer.h>
#include <linux/fixp-arith.h>
#include "ab8500-bm.h"
@ -437,8 +438,9 @@ static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
i++;
}
return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
(res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
return fixp_linear_interpolate(tbl[i].resist, tbl[i].temp,
tbl[i + 1].resist, tbl[i + 1].temp,
res);
}
/**

14
drivers/power/supply/ab8500_fg.c
View file

@ -34,6 +34,7 @@
#include <linux/mfd/abx500/ab8500.h>
#include <linux/iio/consumer.h>
#include <linux/kernel.h>
#include <linux/fixp-arith.h>
#include "ab8500-bm.h"
@ -56,9 +57,6 @@
/* FG constants */
#define BATT_OVV 0x01
#define interpolate(x, x1, y1, x2, y2) \
((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
/**
* struct ab8500_fg_interrupts - ab8500 fg interrupts
* @name: name of the interrupt
@ -868,11 +866,12 @@ static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
}
if ((i > 0) && (i < tbl_size)) {
cap = interpolate(voltage,
cap = fixp_linear_interpolate(
tbl[i].voltage,
tbl[i].capacity * 10,
tbl[i-1].voltage,
tbl[i-1].capacity * 10);
tbl[i-1].capacity * 10,
voltage);
} else if (i == 0) {
cap = 1000;
} else {
@ -920,11 +919,12 @@ static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
}
if ((i > 0) && (i < tbl_size)) {
resist = interpolate(di->bat_temp / 10,
resist = fixp_linear_interpolate(
tbl[i].temp,
tbl[i].resist,
tbl[i-1].temp,
tbl[i-1].resist);
tbl[i-1].resist,
di->bat_temp / 10);
} else if (i == 0) {
resist = tbl[0].resist;
} else {