diff options
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/supply/sc27xx_fuel_gauge.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c index 221b6fb31332..469c83fdaa8e 100644 --- a/drivers/power/supply/sc27xx_fuel_gauge.c +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -62,6 +62,8 @@ #define SC27XX_FGU_CUR_BASIC_ADC 8192 #define SC27XX_FGU_SAMPLE_HZ 2 +/* micro Ohms */ +#define SC27XX_FGU_IDEAL_RESISTANCE 20000 /* * struct sc27xx_fgu_data: describe the FGU device @@ -84,6 +86,7 @@ * @resist_table_len: the resistance table length * @cur_1000ma_adc: ADC value corresponding to 1000 mA * @vol_1000mv_adc: ADC value corresponding to 1000 mV + * @calib_resist: the real resistance of coulomb counter chip in uOhm * @cap_table: capacity table with corresponding ocv * @resist_table: resistance percent table with corresponding temperature */ @@ -108,6 +111,7 @@ struct sc27xx_fgu_data { int resist_table_len; int cur_1000ma_adc; int vol_1000mv_adc; + int calib_resist; struct power_supply_battery_ocv_table *cap_table; struct power_supply_resistance_temp_table *resist_table; }; @@ -900,7 +904,9 @@ static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data) */ cal_4200mv = (calib_data & 0x1ff) + 6963 - 4096 - 256; data->vol_1000mv_adc = DIV_ROUND_CLOSEST(cal_4200mv * 10, 42); - data->cur_1000ma_adc = data->vol_1000mv_adc * 4; + data->cur_1000ma_adc = + DIV_ROUND_CLOSEST(data->vol_1000mv_adc * 4 * data->calib_resist, + SC27XX_FGU_IDEAL_RESISTANCE); kfree(buf); return 0; @@ -1079,6 +1085,15 @@ static int sc27xx_fgu_probe(struct platform_device *pdev) return ret; } + ret = device_property_read_u32(&pdev->dev, + "sprd,calib-resistance-micro-ohms", + &data->calib_resist); + if (ret) { + dev_err(&pdev->dev, + "failed to get fgu calibration resistance\n"); + return ret; + } + data->channel = devm_iio_channel_get(dev, "bat-temp"); if (IS_ERR(data->channel)) { dev_err(dev, "failed to get IIO channel\n"); |