BH1770_LUX_CORR_SCALE
lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;