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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: Yuanjiang Yu <yuanjiang.yu@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
alistair/sunxi64-5.4-dsi
Yuanjiang Yu 2019-07-31 18:00:25 +08:00 committed by Sebastian Reichel
parent 168e68d072
commit 7384b0e766
1 changed files with 4 additions and 7 deletions
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11
drivers/power/supply/sc27xx_fuel_gauge.c
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@ -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)