The power manager The power manager has no public exported APIs. in VS .NET

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The power manager The power manager has no public exported APIs.
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The kernel-level power management framework offers an abstract class (DPowerModel) as a template for the implementation of a power manager:
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class DPowerModel : public DBase { public: virtual void AbsoluteTimerExpired() = 0; virtual void RegisterUserActivity(const TRawEvent& anEvent) = 0; virtual void CpuIdle() = 0; virtual void SystemTimeChanged(TInt anOldTime, TInt aNewTime) = 0; virtual TSupplyStatus MachinePowerStatus() = 0; virtual TInt PowerHalFunction(TInt aFunction, TAny* a1, TAny* a2) = 0; };
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This class de nes the interface between the power framework and the rest of the kernel. It mandates a number of functions that should be implemented by a power manager. The kernel uses the global pointer I mentioned earlier, K::PowerModel, to call these functions. Here is a description of the DPowerModel API: CpuIdle(). The kernel calls this function every time the null thread is scheduled to run RegisterUserActivity(). The kernel calls this function every time an event is added to the event queue. Peripheral drivers that monitor user interaction (such as pressing a key, tapping the touch screen, opening or closing the phone) may add events kernel-side. A user-side component may also add events using the userSvr API AddEvent(), which is exported from EUSER.DLL. The function takes a reference to the raw event as a parameter, so a power manager implementation may choose to respond differently to different events PowerHalFunction(). The kernel s HAL function that handles EHalGroupPower calls this function, passing an identi er to the function to be executed. The power manager implementation should call a platform-speci c handling function AbsoluteTimerExpired(). The kernel calls this function every time an absolute timer completes. (An absolute timer is one that expires at a speci c date and time.) A power manager implementation should call a power controller s platform-speci c implementation, which may regard it as a wakeup event for an impending system-wide transition SystemTimeChanged(). The kernel calls this function every time the software RTC (and eventually the hardware RTC, if one exists) is updated in response to a call to user::SetHomeTime()
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MachinePowerStatus(). The kernel calls this function whenever the framework s exported API Kern::MachinePowerStatus() is called. MachinePowerStatus() should query the battery monitoring component if one is implemented kernel-side. The current implementation of the power manager in Symbian OS also offers: A kernel-side implementation of the corresponding user-side Power class APIs Management of and interface to power handlers Management of and interface to the power controller. Here s the make up of the current Symbian OS power manager:
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class DPowerManager : public DPowerModel { public: void CpuIdle(); void RegisterUserActivity(const TRawEvent& anEvent); TInt PowerHalFunction(TInt aFunction, TAny* a1, TAny* a2); void AbsoluteTimerExpired(); void SystemTimeChanged(TInt anOldTime, TInt aNewTime); TSupplyStatus MachinePowerStatus(); public: static DPowerManager* New(); TInt EnableWakeupEvents(TPowerState); void DisableWakeupEvents(); void RequestWakeupEventNotification(TRequestStatus*); void CancelWakeupEventNotification(); TInt PowerDown(); void AppendHandler(DPowerHandler*); void RemoveHandler(DPowerHandler*); void WakeupEvent(); ... };
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Kernel-side implementation of user-side API The following methods are called in response to corresponding Power class calls: DPowerManager::EnableWakeupEvents() enables tracking of wakeup events for a valid target low power state (standby or off) DPowerManager::DisableWakeupEvents() disables tracking of wakeup events for the target low power state DPowerManager::RequestWakeupEventNotification() enables the delivery of wakeup event noti cations to the client that requested it, whenever one occurs
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DPowerManager::CancelWakeupEventNotification() stops the power manager from delivering wakeup event noti cations to the client that requested them DPowerManager::PowerDown() initiates the kernel-side transition of CPU and peripherals to the target low power state. If the target state is standby, when a wakeup event arrives, it delivers a noti cation to the client if a request is pending. These functions need access to the platform-speci c powercontroller, which is protected against concurrent access and re-entrance with a mutex. Therefore, the corresponding Power class functions execute inside a critical section to prevent the calling thread that holds the mutex from being suspended or killed. Management and interface to power handlers The DPowerManager::AppendHandler API adds the power handler to the list of controlled objects, and the DPowerManager::RemoveHandler API removes it. Management and interface to power controller DPowerManager::WakeupEvent() checks if the power state is valid and completes any pending client s request for wakeup event noti cation.
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The power handler The DPowerHandler class is intended for derivation. The software component that owns the power handler must implement the pure virtual functions and may include other APIs (for example, to allow the handler to request power related resources):
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class DPowerHandler : public DBase { public: // to be implemented by kernel-side power framework IMPORT_C DPowerHandler(); IMPORT_C DPowerHandler(const TDesC& aName); IMPORT_C void Add(); IMPORT_C void Remove(); IMPORT_C void PowerUpDone(); IMPORT_C void PowerDownDone(); IMPORT_C void SetCurrentConsumption(TInt aCurrent); IMPORT_C void DeltaCurrentConsumption(TInt aCurrent); public: // to be implemented at component-specific level virtual void PowerDown(TPowerState) = 0; virtual void PowerUp() = 0; ... };
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