AB8500_GPADC_CALIB_SHIFT_IBAT
>> AB8500_GPADC_CALIB_SHIFT_IBAT;
<< AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low);
V_offset = (AB8500_GPADC_IBAT_VDROP_H << AB8500_GPADC_CALIB_SHIFT_IBAT) -
AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low))
<< AB8500_GPADC_CALIB_SHIFT_IBAT)