modify and add new fields for drivers

models/drivers.go

@@ -3,23 +3,10 @@ package models
 // collection of drivers ordered in map
 type Drivers map[string]*Driver
 
-// driver model
-type Driver struct {
-	Type    string `json:"type,omitempty"` // driver type name of driver in collection
-	Bus     string `json:"bus"`            // name of driver bus
-	Address uint   `json:"address"`        // address of bus
-}
-
-// returns a new collection of drivers
-func NewDrivers() Drivers {
-	return make(Drivers)
-}
-
-// Add new driver to driver collection
-// typ is the name of the driver in driver collection
-func (d *Drivers) AddDriver(typ, bus string, address uint) {
-	(*d)[typ] = &Driver{
-		Bus:     bus,
-		Address: address,
+func (d *Drivers) AddDriver(typ string) *Driver {
+	if drv, ok := (*d)[typ]; ok {
+		return drv
 	}
+	(*d)[typ] = &Driver{Type: typ}
+	return (*d)[typ]
 }