Commit a4585ba2 authored by Linus Walleij's avatar Linus Walleij Committed by Sebastian Reichel
Browse files

power: supply: core: Use library interpolation 



The power supply core appears to contain two open coded
linear interpolations. Use the kernel fixpoint arithmetic
interpolation library function instead.

Cc: Chunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarBaolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 715ecbc1

drivers/power/supply/power_supply_core.c

+31 −30
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/power_supply.h>

#include <linux/property.h>

#include <linux/thermal.h>

#include <linux/fixp-arith.h>

#include "power_supply.h"



/* exported for the APM Power driver, APM emulation */
@@ -783,26 +784,25 @@ EXPORT_SYMBOL_GPL(power_supply_put_battery_info); 
int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,

				    int table_len, int temp)

{

	int i, resist;

	int i, high, low;



	for (i = 0; i < table_len; i++)

	/* Break loop at table_len - 1 because that is the highest index */

	for (i = 0; i < table_len - 1; i++)

		if (temp > table[i].temp)

			break;



	if (i > 0 && i < table_len) {

		int tmp;



		tmp = (table[i - 1].resistance - table[i].resistance) *

			(temp - table[i].temp);

		tmp /= table[i - 1].temp - table[i].temp;

		resist = tmp + table[i].resistance;

	} else if (i == 0) {

		resist = table[0].resistance;

	} else {

		resist = table[table_len - 1].resistance;

	}

	/* The library function will deal with high == low */

	if ((i == 0) || (i == (table_len - 1)))

		high = i;

	else

		high = i - 1;

	low = i;



	return resist;

	return fixp_linear_interpolate(table[low].temp,

				       table[low].resistance,

				       table[high].temp,

				       table[high].resistance,

				       temp);

}

EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
@@ -821,24 +821,25 @@ EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple); 
int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,

				int table_len, int ocv)

{

	int i, cap, tmp;

	int i, high, low;



	for (i = 0; i < table_len; i++)

	/* Break loop at table_len - 1 because that is the highest index */

	for (i = 0; i < table_len - 1; i++)

		if (ocv > table[i].ocv)

			break;



	if (i > 0 && i < table_len) {

		tmp = (table[i - 1].capacity - table[i].capacity) *

			(ocv - table[i].ocv);

		tmp /= table[i - 1].ocv - table[i].ocv;

		cap = tmp + table[i].capacity;

	} else if (i == 0) {

		cap = table[0].capacity;

	} else {

		cap = table[table_len - 1].capacity;

	}



	return cap;

	/* The library function will deal with high == low */

	if ((i == 0) || (i == (table_len - 1)))

		high = i - 1;

	else

		high = i; /* i.e. i == 0 */

	low = i;



	return fixp_linear_interpolate(table[low].ocv,

				       table[low].capacity,

				       table[high].ocv,

				       table[high].capacity,

				       ocv);

}

EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);