TYPICAL POWER MANAGEMENT in .NET framework

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TYPICAL POWER MANAGEMENT
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The power framework and the HAL provide the user-side software battery-management component with an embryonic interface to the battery monitor. The following set of HAL attributes can be used: EPowerBatteryStatus this is used to query the value of iMainBatteryStatus from the previous structure. This is the charge level of the battery (normalized to one of the TSupplyStatus enumerated values) EPowerGood this returns ETrue either if external power is connected or if the current battery charge level is above low EPowerBackupStatus this is used to query the value of iBackupBatteryStatus which is the charge level of a backup battery, if present EPowerExternal this is used to query the value of iExternalPowerPresent which is ETrue if external power, such as the charger, is connected EPowerBackup this can be used to query for the presence of a backup battery EAccessoryPower this can be used to query for presence of accessory power, such as for example, drawing power from a USB cable. The implementation of PowerHAL::PowerHalFunction(...) should therefore call the battery monitor when it is passed one of the previous arguments. It may be that this interface is not enough for the needs of a battery manager component. If that is the case, we suggest the use of a device driver for the purpose of communicating with the battery monitor. The battery monitor would then have a set of exported functions, which would be called by an LDD loaded by the battery manager, which offers a channel for interfacing to the battery manager (Figure 15.4).
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15.3.1.4 Monitoring environmental inputs
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Certain environmental factors such as temperature may have an impact on the power state of CPU and peripherals, and so need to be monitored. For example if the CPU temperature rises above a certain level, the power framework may need to reduce its clock speed to prevent damage. As a further example, certain mobile SDRAM devices have a temperature compensated self-refresh rate, for which software that monitors the case temperature needs to input the current temperature range.
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POWER MANAGEMENT
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AddEvent() SetHomeTime() HalFunction()
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user kernel
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Standby/Shutdown Enable/Disable wakeup events Notification requests
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Wakeup events notification complete
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Timer expiration Power HAL Power status User activity Idle
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AddEvent() Add/remove handler PowerHalFuntion() Peripheral Drivers
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CPU Standby CPU Power Off CPU Idle Absolute Timer expiration
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Request/release power resources
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Wakeup Events
Power Controller
Notification of battery events Registration
Resource Manager
Request/ release power resources
Variant or ASSP
Battery and charger related info
Power HAL
Battery Monitor
Figure 15.4 Framework block diagram with battery monitor
The base port may need to provide software routines to monitor the environmental inputs using hardware sensors and communicate the state of these to other parts of the kernel power framework.
Peripheral low power retention state support Peripheral devices, even those which are integrated as part of the main ASIC, may be capable of operation at low power, and may be transitioned to that mode of operation under software control. These low power states map to the retention state that I described in Section 15.1. Device driver software usually powers up the peripheral device it controls at channel creation time. If a peripheral is controlled by a kernel extension, it is usually powered up at kernel boot time. However, this does not mean that the peripheral device will be used immediately or
TYPICAL POWER MANAGEMENT
that power resources used by that peripheral need to be turned on at the level corresponding to peripheral device activity. We recommend that if a peripheral device is idling, it should be moved to a low power state, if supported. The peripheral driver-speci c part of the power framework should do this. The de nition of peripheral idle may vary from peripheral to peripheral but may be generally de ned as not servicing any requests from its clients and not performing any internal tasks not directly related to service of a client request. Any power-saving measures undertaken by the peripheral driver must be transparent to the users of the peripheral. If the time it takes a peripheral to return to a more available state and service a request has no impact on the performance of peripheral driver or their clients, then it is safe to move the peripheral to a low power state when it reaches an idle condition (Figure 15.5).
PowerHandler::PowerDown && (Usage Count on self)==0