SX9310_REG_PROX_CTRL3_GAIN12_MASK
gain = FIELD_GET(SX9310_REG_PROX_CTRL3_GAIN12_MASK, regval);
mask = SX9310_REG_PROX_CTRL3_GAIN12_MASK;
gain = FIELD_PREP(SX9310_REG_PROX_CTRL3_GAIN12_MASK, gain);