diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2021-07-13 17:27:05 +0200 |
|---|---|---|
| committer | Sebastian Reichel <sebastian.reichel@collabora.com> | 2021-07-16 15:14:30 +0200 |
| commit | f820547446ed05edee2944ebe19ea6a3104434f4 (patch) | |
| tree | 3418764abfa635b28f6a9878ea850c67a7d1ad39 /drivers/power | |
| parent | e73f0f0ee7541171d89f2e2491130c7771ba58d3 (diff) | |
power: supply: ab8500: Use library interpolation
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>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/supply/ab8500_btemp.c | 6 | ||||
| -rw-r--r-- | drivers/power/supply/ab8500_fg.c | 14 |
2 files changed, 11 insertions, 9 deletions
diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c index dbdcff32f353..24958b935d39 100644 --- a/drivers/power/supply/ab8500_btemp.c +++ b/drivers/power/supply/ab8500_btemp.c @@ -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); } /** diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c index 3d45ed0157c6..bdbf3f13bee0 100644 --- a/drivers/power/supply/ab8500_fg.c +++ b/drivers/power/supply/ab8500_fg.c @@ -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 { |