Wakeup +Functions

One important use of GPIO input pins is to signal a wakeup request to the +CPU. Wakeup requests will usually take place when the system is idling and +clocks are switched off. This means that the kind of trigger used to signal +wakeups must be detected asynchronously (not on a clock edge) and hence that +a wakeup trigger should probably be configured for edge detection and not +level detection. Since a wakeup is generic to the whole CPU regardless of +its origin, wakeups are usually combined into a single signal by a logical +OR operation.

Implement the +wakeup functions

Implement EnableWakeup() with return + value KErrNone.

+ Enable wakeup on the pin.
Implement DisableWakeup() with return + value KErrNone.

+ Disable wakeup on the pin.
Implement IsWakeupEnabled() with +return value KErrNone.

+ Verify that the pin supports wakeup and determine the wakeup + state. If is enabled set aEnable to True +and if it is disabled set aEnable to False. +
Implement these functions with return value KErrNotSupported: +
- EnableWakeup()
- DisableWakeup()
- IsWakeupEnabled()
Return KErrNotSupported if the pin does +not support wakeups.