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Standby/Shutdown Enable/Disable wakeup events Notification requests
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Timer expiration Power HAL Power status User activity Idle
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Figure 15.2 Basic framework block diagram
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component responsible for initiating system-wide transitions. In the majority of cases, the behavior of the kernel framework will be the same if the shutdown server is used instead I will describe any exceptions where relevant. Transitions to standby or off are not instantaneous from the moment the user requests the shutting down of the phone, until the framework is requested to perform the transition at kernel level there is typically a lengthy preparation phase in which UI state and application data are saved, and applications are shut down. We therefore want wakeup events that are detected kernel-side to be communicated to the initiator of the transition during the preparation phase. This component may on receiving a wakeup event, cancel or reverse the preparations for the system-wide transition restoring the previous state of UI and applications. Wakeup events are hardware-speci c, and the kernel-level part of the framework maps a set of events to each target low power state. The shutdown server or domain manager must be able to set a target low power state for a system-wide transition and enable the wakeup events for that state. It must also be able to request noti cation of their occurrence, and in time, request the kernel framework to transition to that state. When deciding to stop or reverse the preparations to a system-wide transition to a low power state, the initiator of the system-wide transition must be able to request the disabling of wakeup events for the previous target low power state, and set the target state to active. It must also be able to cancel the request for noti cation of wakeup events. Once the kernel-side power framework has initiated a transition, the user-side initiator cannot stop that transition although a wakeup event may still prevent it taking place. The power manager manages the kernel-side transitions. All of the user-side requests that I ve mentioned are routed to the power manager. This receives a request to power off or go to standby state, and dispatches noti cations to other components that manage the transition of CPU and peripherals to those states. Peripheral drivers for peripherals that need to be powered down as a result of a system-wide transition to standby or off must own a power handler. When these peripheral drivers are started, they need to register with the power manager for noti cations of system-wide power transitions the power manager keeps a list of registered power handlers. When the peripheral driver object is destroyed, it should de-register its power handler with the power manager. The power manager noti es every registered peripheral driver of an imminent power down through its power handler. Upon receiving these noti cations, peripheral drivers should change the power state of the peripheral they control so as not to compromise the eventual system-wide power transition that is taking place.
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As peripheral power down may take some time, each power handler owns a fast semaphore, which the power manager waits on, after requesting it to power down the peripheral. This semaphore is signaled upon completion of the peripheral power down. After all peripherals have powered down, the power manager should request the CPU to power down. To do this, it calls down to the power controller. If the target state of the system-wide power transition is off, instruction execution terminates soon after the call to the power controller is issued. If the target state is standby, the CPU is eventually brought back to the active state when a wakeup event occurs. Instruction execution is resumed inside the power controller call, and then control is returned to the power manager, which then powers up all peripheral drivers owning a registered power handler, and waits for them to power up, in a sequence that is the reverse of the power down that I explained previously. Wakeup events may also occur during the user-side transition, and if they are enabled, should be propagated up to the component that initiated that transition. Wakeup events are monitored at the variant-speci c level, so every request to enable or disable them should be propagated down to the power controller. Each system-wide low power state (standby and off) may have a different set of wakeup events. So, if the domain manager requests the enabling of wakeup events when the target state is already a low power state the power manager will disable the set corresponding to the previous low power state, before enabling the set corresponding to the new low power state. If the domain manager requests the disabling of wakeup events, the power manager assumes that it decided to stop or reverse the transition, so it is sets the target state to active. The power controller may monitor wakeup events directly, or delegate this to a peripheral driver. In the latter case, the peripheral driver must notify the power controller of the occurrence of a wakeup event, and the power controller then propagates the noti cation to the power manager, which completes any pending user-side request for noti cation. If the target low power state of a system-wide transition is standby, and a wakeup event happens after the kernel framework is requested to transition, but before the CPU is moved to that state, then the implementation should not complete the transition. If no event occurs, it will return when a detected wakeup event nally occurs. Another important function of the kernel power framework is to detect the moment when the CPU idles. This can be used to move the CPU and platform to a power-saving state. Such decisions must be taken at variant-speci c level, and therefore must involve the power controller. The kernel noti es the power manager every time the null thread is scheduled to run. A power manager implementation calls down to the