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gpio: implement pin caching

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this allows for the short version of the API to work as expected as
consecutive calls to the same pin would now be internally working on the
pin instance (all the 3 currently supported types). closing a pin busts
the cache
This commit is contained in:
Karan Misra 2014-04-06 05:30:54 +05:30
parent 6f90af377d
commit 57328c979d
7 changed files with 164 additions and 22 deletions
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33
gpiodriver.go
View file

@ -11,9 +11,9 @@ type pin interface {
Close() error
}
type digitalPinFactory func(n int) DigitalPin
type analogPinFactory func(n int) AnalogPin
type pwmPinFactory func(n string) PWMPin
type digitalPinFactory func(pd *PinDesc, drv GPIODriver) DigitalPin
type analogPinFactory func(pd *PinDesc, drv GPIODriver) AnalogPin
type pwmPinFactory func(pd *PinDesc, drv GPIODriver) PWMPin
type gpioDriver struct {
pinMap PinMap
@ -36,6 +36,15 @@ func newGPIODriver(pinMap PinMap, dpf digitalPinFactory, apf analogPinFactory, p
}
}
func (io *gpioDriver) Unregister(id string) error {
if _, ok := io.initializedPins[id]; !ok {
return fmt.Errorf("gpio: pin %v is not registered yet, cannot unregister", id)
}
delete(io.initializedPins, id)
return nil
}
func (io *gpioDriver) DigitalPin(key interface{}) (DigitalPin, error) {
if io.dpf == nil {
return nil, errors.New("gpio: digital io not supported on this host")
@ -46,7 +55,11 @@ func (io *gpioDriver) DigitalPin(key interface{}) (DigitalPin, error) {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.dpf(pd.DigitalLogical)
if p, ok := io.initializedPins[pd.ID]; ok {
return p.(DigitalPin), nil
}
p := io.dpf(pd, io)
io.initializedPins[pd.ID] = p
return p, nil
@ -62,7 +75,11 @@ func (io *gpioDriver) AnalogPin(key interface{}) (AnalogPin, error) {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.apf(pd.AnalogLogical)
if p, ok := io.initializedPins[pd.ID]; ok {
return p.(AnalogPin), nil
}
p := io.apf(pd, io)
io.initializedPins[pd.ID] = p
return p, nil
@ -78,7 +95,11 @@ func (io *gpioDriver) PWMPin(key interface{}) (PWMPin, error) {
return nil, fmt.Errorf("gpio: could not find pin matching %v", key)
}
p := io.ppf(pd.ID)
if p, ok := io.initializedPins[pd.ID]; ok {
return p.(PWMPin), nil
}
p := io.ppf(pd, io)
io.initializedPins[pd.ID] = p
return p, nil