bh1770_lux_rate
ret = bh1770_lux_rate(chip, i);
ret = bh1770_lux_rate(chip, chip->lux_rate_index);
bh1770_lux_rate(chip, chip->lux_rate_index);
bh1770_lux_rate(chip, chip->lux_rate_index);
ret = bh1770_lux_rate(chip, chip->lux_rate_index);