Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7384b0e7 authored by Yuanjiang Yu's avatar Yuanjiang Yu Committed by Sebastian Reichel
Browse files

power: supply: sc27xx: Fix the the accuracy issue of coulomb calculation 



The Spreadtrum fuel gauge will multiply by 2 for counting the coulomb
counter to improve the accuracy, which means the value saved in fuel
gauge is: coulomb counter * 2 * 1000ma_adc. Thus fix the conversion
formular to improve the accuracy of calculating the battery capacity.

Signed-off-by: default avatarYuanjiang Yu <yuanjiang.yu@unisoc.com>
Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 168e68d0

drivers/power/supply/sc27xx_fuel_gauge.c

+4 −7
Original line number Diff line number Diff line
@@ -326,8 +326,6 @@ static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) 
{

	int ret;



	clbcnt *= SC27XX_FGU_SAMPLE_HZ;



	ret = regmap_update_bits(data->regmap,

				 data->base + SC27XX_FGU_CLBCNT_SETL,

				 SC27XX_FGU_CLBCNT_MASK, clbcnt);
@@ -362,7 +360,6 @@ static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) 


	*clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK;

	*clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT;

	*clb_cnt /= SC27XX_FGU_SAMPLE_HZ;



	return 0;

}
@@ -380,10 +377,10 @@ static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) 


	/*

	 * Convert coulomb counter to delta capacity (mAh), and set multiplier

	 * as 100 to improve the precision.

	 * as 10 to improve the precision.

	 */

	temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360);

	temp = sc27xx_fgu_adc_to_current(data, temp);

	temp = DIV_ROUND_CLOSEST(delta_clbcnt * 10, 36 * SC27XX_FGU_SAMPLE_HZ);

	temp = sc27xx_fgu_adc_to_current(data, temp / 1000);



	/*

	 * Convert to capacity percent of the battery total capacity,
@@ -790,7 +787,7 @@ static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) 
	 * Convert current capacity (mAh) to coulomb counter according to the

	 * formula: 1 mAh =3.6 coulomb.

	 */

	return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc, 10);

	return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc * SC27XX_FGU_SAMPLE_HZ, 10);

}



static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data)