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996 lines
30 KiB
996 lines
30 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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pbatt.c
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Abstract:
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This module interfaces the policy manager to the composite device
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Author:
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Ken Reneris (kenr) 17-Jan-1997
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Revision History:
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--*/
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#include "pop.h"
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//
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// Internal prototypes
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//
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VOID
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PopRecalculateCBTriggerLevels (
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ULONG Flags
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);
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VOID
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PopComputeCBTime (
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VOID
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, PopRecalculateCBTriggerLevels)
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#pragma alloc_text(PAGE, PopCompositeBatteryDeviceHandler)
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#pragma alloc_text(PAGE, PopComputeCBTime)
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#pragma alloc_text(PAGE, PopResetCBTriggers)
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#pragma alloc_text(PAGE, PopCurrentPowerState)
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#endif
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VOID
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PopCompositeBatteryUpdateThrottleLimit(
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IN ULONG CurrentCapacity
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)
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/*++
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Routine Description:
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This routine is called to update the ThrottleLimit in each of the
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processor's PRCB.
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We update the ThrottleLimit based on the percentage of the battery's
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capacity that remains. I.e. we are called to throttle the processor
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to lower frequencies as the battery runs down.
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This function was broken out because it cannot be paged code
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Arguments:
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CurrentCapacity - PercentageCapacity remaining...
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Return Value:
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None
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--*/
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{
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KAFFINITY currentAffinity;
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KAFFINITY processors;
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PPROCESSOR_PERF_STATE perfStates;
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PPROCESSOR_POWER_STATE pState;
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ULONG perfStatesCount;
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ULONG i;
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KIRQL oldIrql;
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#if DBG
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ULONGLONG currentTime;
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UCHAR t[40];
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currentTime = KeQueryInterruptTime();
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PopTimeString(t, currentTime);
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#endif
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//
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// Walk the processors and set each one's PRCB based
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// on our incoming %-remaining of the battery's life.
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//
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currentAffinity = 1;
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processors = KeActiveProcessors;
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while (processors) {
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if (!(processors & currentAffinity)) {
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currentAffinity <<= 1;
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continue;
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}
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KeSetSystemAffinityThread( currentAffinity );
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processors &= ~currentAffinity;
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currentAffinity <<= 1;
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//
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// We need to be running at DISPATCH_LEVEL to access the
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// structures referenced within the pState...
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//
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KeRaiseIrql( DISPATCH_LEVEL, &oldIrql );
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pState = &(KeGetCurrentPrcb()->PowerState);
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//
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// Does this processor support throttling?
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//
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if ((pState->Flags & PSTATE_SUPPORTS_THROTTLE) == 0) {
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//
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// No, then we don't care about it...
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//
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KeLowerIrql( oldIrql );
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continue;
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}
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//
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// Look at the power structure and get the array of
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// perf states supported. Note that we change the
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// perfStatesCount by subtracting one so that we don't
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// have to worry about overrruning the array during
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// the for loop
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//
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pState = &(KeGetCurrentPrcb()->PowerState);
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perfStates = pState->PerfStates;
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perfStatesCount = (pState->PerfStatesCount - 1);
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//
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// See which throttle point is best for this power
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// capacity. Note that we have pre-calculated which
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// capacity matches which state, so its only a matter
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// of walking the array...
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//
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for (i = pState->KneeThrottleIndex; i < perfStatesCount; i++) {
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if (perfStates[i].MinCapacity <= CurrentCapacity) {
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break;
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}
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}
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//
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// Update the throttle limit index
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//
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if (pState->ThrottleLimitIndex != i) {
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pState->ThrottleLimitIndex = (UCHAR) i;
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#if DBG
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PoPrint(
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PO_THROTTLE,
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("PopApplyThermalThrottle - %s - New Limit (%d) Index (%d)\n",
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t,perfStates[i].PercentFrequency,i)
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);
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#endif
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//
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// Force a throttle update
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//
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PopUpdateProcessorThrottle();
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}
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//
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// Revert back to our previous IRQL
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//
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KeLowerIrql( oldIrql );
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} // while
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//
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// Revert to the affinity of the original thread
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//
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KeRevertToUserAffinityThread();
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}
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VOID
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PopCompositeBatteryDeviceHandler (
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN PVOID Context
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)
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/*++
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Routine Description:
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This function is the irp handler function to handle the completion
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of the composite battery irp. When there is a composite battery
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present one IRP is always outstanding to the device. On completion
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this IRP is recycled to the next request.
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N.B. PopPolicyLock must be held.
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Arguments:
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DeviceObject - DeviceObject of the battery device
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Irp - Irp which has completed
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Context - n/a
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Return Value:
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None.
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--*/
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{
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PIO_STACK_LOCATION IrpSp;
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PVOID InputBuffer;
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ULONG InputBufferLength, OutputBufferLength;
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ULONG IoctlCode;
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ULONG i;
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ULONG currentCapacity;
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#if DBG
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ULONGLONG currentTime;
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UCHAR t[40];
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currentTime = KeQueryInterruptTime();
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PopTimeString(t, currentTime);
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#endif
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UNREFERENCED_PARAMETER (Context);
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ASSERT_POLICY_LOCK_OWNED();
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ASSERT (Irp == PopCB.StatusIrp);
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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if (NT_SUCCESS(Irp->IoStatus.Status)) {
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//
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// Handle the completed request
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//
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switch (PopCB.State) {
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case PO_CB_READ_TAG:
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case PO_CB_WAIT_TAG:
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//
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// A new battery has appeared on the system. We need to
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// go read the tag information and reset the battery
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// triggers.
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//
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PoPrint(PO_BATT, ("PopCB: New battery tag\n"));
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//
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// Reset the triggers.
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//
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// We reset PO_TRG_SET, so the level will be recalculated.
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//
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// Note that on battery tag change, we don't want to make
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// the actions happen again. If the trigger has not yet
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// been set off, it will still be armed.
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//
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PopResetCBTriggers (PO_TRG_SET);
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PopCB.State = PO_CB_READ_INFO;
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PopCB.Tag = PopCB.u.Tag;
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// Ensure that the power state passed in is bad, so QUERY_STATUS
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// will return immediately.
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PopCB.Status.PowerState = (ULONG) -1;
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break;
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case PO_CB_READ_INFO:
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//
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// Read the info directly into our 'Info' field, then ask
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// ourselves to go read the 'Status', thus performing some
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// verification.
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//
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PoPrint(PO_BATT, ("PopCB: info read\n"));
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PopCB.State = PO_CB_READ_STATUS;
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RtlCopyMemory (&PopCB.Info, &PopCB.u.Info, sizeof(PopCB.Info));
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break;
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case PO_CB_READ_STATUS:
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{
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PSYSTEM_POWER_POLICY SystemPolicy;
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PPROCESSOR_POWER_POLICY ProcessorPolicy;
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//
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// Status has been read, check it
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//
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PoPrint(PO_BATT, ("PopCB: Status PwrState %x, Cap %x, Volt %x, Cur %x\n",
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PopCB.u.Status.PowerState,
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PopCB.u.Status.Capacity,
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PopCB.u.Status.Voltage,
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PopCB.u.Status.Current
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));
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PopCB.StatusTime = KeQueryInterruptTime();
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//
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// Check if the current policy should be ac or dc
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//
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if (PopCB.u.Status.PowerState & BATTERY_POWER_ON_LINE) {
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ProcessorPolicy = &PopAcProcessorPolicy;
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SystemPolicy = &PopAcPolicy;
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} else {
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ProcessorPolicy = &PopDcProcessorPolicy;
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SystemPolicy = &PopDcPolicy;
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}
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//
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// Did the policy change?
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//
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if (PopPolicy != SystemPolicy || PopProcessorPolicy != ProcessorPolicy) {
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//
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// Change the active policy and reset the battery triggers
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//
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PopProcessorPolicy = ProcessorPolicy;
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PopPolicy = SystemPolicy;
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//
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// Reset triggers.
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//
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// In this case we re-arm both the user and system triggers.
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// The system trigger will be disarmed when we recalculate
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// trigger levels if the capacity was already below that level.
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//
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PopResetCBTriggers (PO_TRG_SET | PO_TRG_USER | PO_TRG_SYSTEM);
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PopSetNotificationWork (
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PO_NOTIFY_ACDC_CALLBACK |
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PO_NOTIFY_POLICY |
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PO_NOTIFY_PROCESSOR_POLICY
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);
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//
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// Recompute thermal throttle and cooling mode
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//
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// Note that PopApplyThermalThrottle will take care of any dynamic
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// throttling that might need to happen due to the AC/DC transition.
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//
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PopApplyThermalThrottle ();
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PopIdleUpdateIdleHandlers();
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//
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// Recompute system idle values
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//
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PopInitSIdle ();
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}
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//
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// Did battery cross resolution setting?
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// Correction... Has it changed at all. If so, all apps should be updated,
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// even if it hasn't crossed a resolution setting. Otherwise, if one app
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// queries the current status, it could be displaying a different value than
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// the battery meter.
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//
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if ((PopCB.u.Status.Capacity != PopCB.Status.Capacity) ||
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PopCB.Status.PowerState != PopCB.u.Status.PowerState) {
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PopSetNotificationWork (PO_NOTIFY_BATTERY_STATUS);
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PopCB.State = PO_CB_READ_EST_TIME;
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}
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PopRecalculateCBTriggerLevels (PO_TRG_SYSTEM);
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//
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// Update current battery status
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//
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memcpy (&PopCB.Status, &PopCB.u.Status, sizeof (PopCB.Status));
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//
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// Check for discharging and if any discharge policies have tripped
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//
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if (SystemPolicy == &PopDcPolicy) {
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for (i=0; i < PO_NUM_POWER_LEVELS; i++) {
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if (PopCB.Status.Capacity <= PopCB.Trigger[i].Battery.Level) {
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//
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// Fire this power action
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//
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PopSetPowerAction(
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&PopCB.Trigger[i],
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PO_NOTIFY_BATTERY_STATUS,
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&SystemPolicy->DischargePolicy[i].PowerPolicy,
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SystemPolicy->DischargePolicy[i].MinSystemState,
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SubstituteLightestOverallDownwardBounded
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);
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PopCB.State = PO_CB_READ_EST_TIME;
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} else {
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//
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// Clear the trigger for this event
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//
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PopCB.Trigger[i].Flags &= ~(PO_TRG_USER|PO_TRG_SYSTEM);
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}
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}
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//
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// Figure out what our current capacity is while guarding
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// against whacky UI...
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//
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if (PopCB.Info.FullChargedCapacity > PopCB.Status.Capacity) {
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currentCapacity = PopCB.Status.Capacity * 100 /
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PopCB.Info.FullChargedCapacity;
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} else {
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//
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// Assume that the battery is fully charged...
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// This will cause us to reset the throttle limiter
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//
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currentCapacity = 100;
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}
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} else {
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//
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// Assume that the battery is fully charged...
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// This will cause us to reset the throttle limiter
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//
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currentCapacity = 100;
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}
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//
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// This is kind of silly code to put in here, but since
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// want to minize our synchronization elsewhere, we have
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// to examine every processor's powerstate and update
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// the throttlelimitindex on each. This may be actually
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// a smart thing to do if not all processors support
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// the same set of states
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//
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PopCompositeBatteryUpdateThrottleLimit( currentCapacity );
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//
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// If there's a thread waiting or if we notified user (since
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// the response to the notify will be to read the power status) for
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// power state, read the est time now else read new status
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//
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if (PopCB.ThreadWaiting) {
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PopCB.State = PO_CB_READ_EST_TIME;
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}
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break;
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}
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case PO_CB_READ_EST_TIME:
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//
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// Estimated time is read after sucessful status
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// read and (currently) only when there's a thread
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// waiting for the system power state
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//
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PoPrint(PO_BATT, ("PopCB: EstTime read\n"));
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PopCB.EstTime = PopCB.u.EstTime;
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PopCB.EstTimeTime = KeQueryInterruptTime();
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PopComputeCBTime();
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//
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// Signal waiting threads
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//
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PopCB.ThreadWaiting = FALSE;
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KeSetEvent (&PopCB.Event, 0, FALSE);
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//
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// Go back are read status
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//
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PopCB.State = PO_CB_READ_STATUS;
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break;
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default:
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PopInternalAddToDumpFile( Irp, sizeof(IRP), DeviceObject, NULL, NULL, NULL );
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KeBugCheckEx( INTERNAL_POWER_ERROR,
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0x300,
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POP_BATT,
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(ULONG_PTR)DeviceObject,
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(ULONG_PTR)Irp );
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break;
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}
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} else {
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//
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// some sort of error, if the request was canceld re-issue
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// it else backup to reinitialize
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//
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if (Irp->IoStatus.Status != STATUS_CANCELLED) {
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//
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// This occurs under two circumstances. It is either the first time
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// through, or a battery was removed so the Irp failed during our
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// attempt to tag change.
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//
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//
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// If this is already a read-tag request then there's no battery present
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//
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PopCB.State = (PopCB.State == PO_CB_READ_TAG) ? PO_CB_WAIT_TAG : PO_CB_READ_TAG;
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PoPrint(PO_BATT, ("PopCB: error %x - new state %d\n",
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Irp->IoStatus.Status,
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PopCB.State
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));
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} else {
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PoPrint(PO_BATT, ("PopCB: irp cancelled\n"));
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PopRecalculateCBTriggerLevels (PO_TRG_SYSTEM | PO_TRG_USER);
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}
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}
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//
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// If new state is none, then there's no battery
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//
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if (PopCB.State != PO_CB_NONE) {
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//
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// Issue new request based on current state
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//
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IrpSp = IoGetNextIrpStackLocation(Irp);
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IrpSp->MajorFunction = IRP_MJ_DEVICE_CONTROL;
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IoctlCode = IOCTL_BATTERY_QUERY_INFORMATION;
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PopCB.u.QueryInfo.BatteryTag = PopCB.Tag;
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InputBuffer = &PopCB.u.QueryInfo;
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InputBufferLength = sizeof(PopCB.u.QueryInfo);
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switch (PopCB.State) {
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case PO_CB_READ_TAG:
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PoPrint(PO_BATT, ("PopCB: query tag\n"));
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IoctlCode = IOCTL_BATTERY_QUERY_TAG;
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PopCB.u.Tag = (ULONG) 0;
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InputBufferLength = sizeof(ULONG);
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OutputBufferLength = sizeof(PopCB.Tag);
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break;
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case PO_CB_WAIT_TAG:
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PoPrint(PO_BATT, ("PopCB: query tag\n"));
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//
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// Battery is gone. Wait for it to appear
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//
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IoctlCode = IOCTL_BATTERY_QUERY_TAG;
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PopCB.u.Tag = (ULONG) -1;
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InputBufferLength = sizeof(ULONG);
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OutputBufferLength = sizeof(PopCB.Tag);
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//
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// Notify battery status change, and wake any threads
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//
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PopSetNotificationWork (PO_NOTIFY_BATTERY_STATUS);
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if (PopCB.ThreadWaiting) {
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PopCB.ThreadWaiting = FALSE;
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KeSetEvent (&PopCB.Event, 0, FALSE);
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}
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break;
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case PO_CB_READ_INFO:
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PoPrint(PO_BATT, ("PopCB: query info\n"));
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PopCB.u.QueryInfo.InformationLevel = BatteryInformation;
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OutputBufferLength = sizeof(PopCB.Info);
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break;
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case PO_CB_READ_STATUS:
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//
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// Calculate next wait
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//
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PopCB.u.Wait.BatteryTag = PopCB.Tag;
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PopCB.u.Wait.PowerState = PopCB.Status.PowerState;
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PopCB.u.Wait.Timeout = (ULONG) -1;
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if (PopCB.ThreadWaiting) {
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PopCB.u.Wait.Timeout = 0;
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}
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i = (PopCB.Info.FullChargedCapacity *
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PopPolicy->BroadcastCapacityResolution) / 100;
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if (!i) {
|
|
i = 1;
|
|
}
|
|
|
|
if (PopCB.Status.Capacity > i) {
|
|
PopCB.u.Wait.LowCapacity = PopCB.Status.Capacity - i;
|
|
} else {
|
|
PopCB.u.Wait.LowCapacity = 0;
|
|
}
|
|
|
|
PopCB.u.Wait.HighCapacity = PopCB.Status.Capacity + i;
|
|
if (PopCB.u.Wait.HighCapacity < i) {
|
|
// avoid rare case of overflow
|
|
PopCB.u.Wait.HighCapacity = (ULONG) -1;
|
|
}
|
|
|
|
//
|
|
// Check limits against power policies
|
|
//
|
|
|
|
for (i=0; i < PO_NUM_POWER_LEVELS; i++) {
|
|
if (PopCB.Trigger[i].Flags & PO_TRG_SET) {
|
|
|
|
if (PopCB.Trigger[i].Battery.Level < PopCB.Status.Capacity &&
|
|
PopCB.Trigger[i].Battery.Level > PopCB.u.Wait.LowCapacity) {
|
|
|
|
PopCB.u.Wait.LowCapacity = PopCB.Trigger[i].Battery.Level;
|
|
}
|
|
|
|
if (PopCB.Trigger[i].Battery.Level > PopCB.Status.Capacity &&
|
|
PopCB.Trigger[i].Battery.Level < PopCB.u.Wait.HighCapacity) {
|
|
|
|
PopCB.u.Wait.HighCapacity = PopCB.Trigger[i].Battery.Level;
|
|
}
|
|
}
|
|
}
|
|
|
|
IoctlCode = IOCTL_BATTERY_QUERY_STATUS;
|
|
InputBuffer = &PopCB.u.Wait;
|
|
InputBufferLength = sizeof(PopCB.u.Wait);
|
|
OutputBufferLength = sizeof(PopCB.Status);
|
|
PoPrint(PO_BATT, ("PopCB: timeout %x, pwrstate %x, low %x - high %x\n",
|
|
PopCB.u.Wait.Timeout,
|
|
PopCB.u.Wait.PowerState,
|
|
PopCB.u.Wait.LowCapacity,
|
|
PopCB.u.Wait.HighCapacity
|
|
));
|
|
|
|
break;
|
|
|
|
case PO_CB_READ_EST_TIME:
|
|
PoPrint(PO_BATT, ("PopCB: query est time\n"));
|
|
PopCB.u.QueryInfo.InformationLevel = BatteryEstimatedTime;
|
|
PopCB.u.QueryInfo.AtRate = 0;
|
|
OutputBufferLength = sizeof(PopCB.EstTime);
|
|
break;
|
|
|
|
default:
|
|
PopInternalAddToDumpFile( IrpSp, sizeof(IO_STACK_LOCATION), DeviceObject, NULL, NULL, NULL );
|
|
KeBugCheckEx( INTERNAL_POWER_ERROR,
|
|
0x301,
|
|
POP_BATT,
|
|
(ULONG_PTR)DeviceObject,
|
|
(ULONG_PTR)IrpSp );
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Submit IRP
|
|
//
|
|
|
|
IrpSp->Parameters.DeviceIoControl.IoControlCode = IoctlCode;
|
|
IrpSp->Parameters.DeviceIoControl.InputBufferLength = InputBufferLength;
|
|
IrpSp->Parameters.DeviceIoControl.OutputBufferLength = OutputBufferLength;
|
|
Irp->AssociatedIrp.SystemBuffer = &PopCB.u;
|
|
Irp->UserBuffer = &PopCB.u;
|
|
Irp->PendingReturned = FALSE;
|
|
Irp->Cancel = FALSE;
|
|
IoSetCompletionRoutine (Irp, PopCompletePolicyIrp, NULL, TRUE, TRUE, TRUE);
|
|
IoCallDriver (DeviceObject, Irp);
|
|
|
|
} else {
|
|
//
|
|
// Battery has disappeared (state is PO_CB_NONE)
|
|
//
|
|
|
|
PoPrint(PO_BATT, ("PopCB: Battery removed\n"));
|
|
PopSetNotificationWork (PO_NOTIFY_BATTERY_STATUS);
|
|
|
|
//
|
|
// Set policy to AC
|
|
//
|
|
|
|
if (PopPolicy != &PopAcPolicy) {
|
|
PopPolicy = &PopAcPolicy;
|
|
PopProcessorPolicy = &PopAcProcessorPolicy;
|
|
PopSetNotificationWork(
|
|
PO_NOTIFY_ACDC_CALLBACK |
|
|
PO_NOTIFY_POLICY |
|
|
PO_NOTIFY_PROCESSOR_POLICY
|
|
);
|
|
PopApplyThermalThrottle();
|
|
PopIdleUpdateIdleHandlers();
|
|
PopInitSIdle ();
|
|
}
|
|
|
|
//
|
|
// Wake any threads
|
|
//
|
|
|
|
if (PopCB.ThreadWaiting) {
|
|
PopCB.ThreadWaiting = FALSE;
|
|
KeSetEvent (&PopCB.Event, 0, FALSE);
|
|
}
|
|
|
|
//
|
|
// Cleanup
|
|
//
|
|
|
|
IoFreeIrp (Irp);
|
|
PopCB.StatusIrp = NULL;
|
|
ObDereferenceObject (DeviceObject);
|
|
}
|
|
}
|
|
|
|
|
|
VOID
|
|
PopRecalculateCBTriggerLevels (
|
|
ULONG Flags
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function is invoked to set the trigger battery levels based on the power
|
|
policy. This will be invoked whenever the power policy is changed, or whenever
|
|
there is a battery status change that could affect these settings.
|
|
|
|
N.B. PopPolicyLock must be held.
|
|
|
|
Arguments:
|
|
|
|
Flags- The flags to set if the level has already been passed:
|
|
example: When user changes alarm leve, we don't want clear
|
|
PO_TRG_USER|PO_TRG_SYSTEM. If the recalculation was caused by a change
|
|
(startup, or AC unplug), we just want to set PO_TRG_SYSTEM because we
|
|
still want the user notification.
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
--*/
|
|
{
|
|
PSYSTEM_POWER_LEVEL DPolicy;
|
|
ULONG i;
|
|
|
|
//
|
|
// Calculate any level settings
|
|
//
|
|
|
|
for (i=0; i < PO_NUM_POWER_LEVELS; i++) {
|
|
DPolicy = &PopPolicy->DischargePolicy[i];
|
|
|
|
//
|
|
// If this setting not calculated handle it
|
|
//
|
|
|
|
if (!(PopCB.Trigger[i].Flags & PO_TRG_SET) && DPolicy->Enable) {
|
|
|
|
//
|
|
// Compute battery capacity setting for percentage
|
|
//
|
|
|
|
PopCB.Trigger[i].Flags |= PO_TRG_SET;
|
|
PopCB.Trigger[i].Battery.Level =
|
|
PopCB.Info.FullChargedCapacity * DPolicy->BatteryLevel / 100 +
|
|
PopCB.Info.FullChargedCapacity / 200;
|
|
|
|
//
|
|
// Make sure setting is not below the lowest default
|
|
//
|
|
|
|
if (PopCB.Trigger[i].Battery.Level < PopCB.Info.DefaultAlert1) {
|
|
PopCB.Trigger[i].Battery.Level = PopCB.Info.DefaultAlert1;
|
|
}
|
|
|
|
//
|
|
// Skip system action if battery capacity was already below level.
|
|
// This will occur on startup, when a battery is changed,
|
|
// and when AC comes or goes.
|
|
//
|
|
|
|
if (PopCB.Status.Capacity < PopCB.Trigger[i].Battery.Level) {
|
|
PopCB.Trigger[i].Flags |= Flags;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
VOID
|
|
PopComputeCBTime (
|
|
VOID
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function is invoked after the battery status & estimated time
|
|
have been read from the battery. This function can apply heuristics
|
|
or other knowedge to improve the extimated time.
|
|
|
|
N.B. PopPolicyLock must be held.
|
|
|
|
Arguments:
|
|
|
|
None
|
|
|
|
Return Value:
|
|
|
|
None.
|
|
|
|
--*/
|
|
{
|
|
// for now just use the batteries value
|
|
PopCB.AdjustedEstTime = PopCB.EstTime;
|
|
}
|
|
|
|
VOID
|
|
PopResetCBTriggers (
|
|
IN UCHAR Flags
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function clears the requested bits from the batteries trigger flags.
|
|
|
|
N.B. PopPolicyLock must be held.
|
|
|
|
Arguments:
|
|
|
|
Flags - Bits to clear
|
|
|
|
Return Value:
|
|
|
|
Status
|
|
|
|
--*/
|
|
{
|
|
ULONG i;
|
|
|
|
ASSERT_POLICY_LOCK_OWNED();
|
|
|
|
//
|
|
// Clear flag bits
|
|
//
|
|
|
|
Flags = ~Flags;
|
|
for (i=0; i < PO_NUM_POWER_LEVELS; i++) {
|
|
PopCB.Trigger[i].Flags &= Flags;
|
|
}
|
|
|
|
//
|
|
// Reread battery status
|
|
//
|
|
|
|
if (PopCB.StatusIrp) {
|
|
IoCancelIrp (PopCB.StatusIrp);
|
|
}
|
|
}
|
|
|
|
NTSTATUS
|
|
PopCurrentPowerState (
|
|
OUT PSYSTEM_BATTERY_STATE PowerState
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This function returns the current system battery state. If needed,
|
|
this function will cause the composite battery irp to get the
|
|
current battery status, then converts that information into a more
|
|
readable SYSTEM_BATTERY_STATE structure which is retuned back
|
|
to the user.
|
|
|
|
N.B. PopPolicyLock must be held.
|
|
N.B. The function may drop the PopPolicyLock
|
|
|
|
Arguments:
|
|
|
|
PowerState - pointer to a structure which will recieve the
|
|
current system battery state.
|
|
|
|
Return Value:
|
|
|
|
Status
|
|
|
|
--*/
|
|
{
|
|
ULONGLONG CurrentTime;
|
|
NTSTATUS Status;
|
|
|
|
|
|
ASSERT_POLICY_LOCK_OWNED();
|
|
|
|
Status = STATUS_SUCCESS;
|
|
RtlZeroMemory (PowerState, sizeof(SYSTEM_BATTERY_STATE));
|
|
|
|
//
|
|
// Wait for valid state in PopCB
|
|
//
|
|
|
|
do {
|
|
|
|
//
|
|
// If there's not a composite battery, then return
|
|
//
|
|
|
|
if (PopCB.State == PO_CB_NONE || PopCB.State == PO_CB_WAIT_TAG) {
|
|
PowerState->AcOnLine = (PopPolicy == &PopAcPolicy ? TRUE : FALSE);
|
|
|
|
// Indicate no battery found...
|
|
PERFINFO_POWER_BATTERY_LIFE_INFO(-1, 0);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// If device state not being read, we need to wait
|
|
//
|
|
|
|
if (PopCB.State == PO_CB_READ_STATUS) {
|
|
//
|
|
// If last EstTime was calculated within PO_MAX_CB_CACHE_TIME,
|
|
// use the current data. (note this implies status was sucessfully
|
|
// read just before time was calcualted)
|
|
//
|
|
|
|
CurrentTime = KeQueryInterruptTime();
|
|
if (CurrentTime - PopCB.EstTimeTime < PO_MAX_CB_CACHE_TIME) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Need new status. If no other threads are waiting for
|
|
// system power state, then setup for wait
|
|
//
|
|
|
|
if (!PopCB.ThreadWaiting) {
|
|
PopCB.ThreadWaiting = TRUE;
|
|
KeResetEvent (&PopCB.Event);
|
|
|
|
//
|
|
// If read status is in progress, cancel it so we
|
|
// can read status now
|
|
//
|
|
|
|
if (PopCB.State == PO_CB_READ_STATUS) {
|
|
IoCancelIrp (PopCB.StatusIrp);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Wait for status update
|
|
//
|
|
|
|
PopReleasePolicyLock (FALSE);
|
|
Status = KeWaitForSingleObject (&PopCB.Event, Executive, KernelMode, TRUE, NULL);
|
|
PopAcquirePolicyLock ();
|
|
} while (NT_SUCCESS(Status));
|
|
|
|
//
|
|
// Generate power state
|
|
//
|
|
|
|
PowerState->AcOnLine = (PopCB.Status.PowerState & BATTERY_POWER_ON_LINE) ? TRUE : FALSE;
|
|
PowerState->BatteryPresent = TRUE;
|
|
PowerState->Charging = (PopCB.Status.PowerState & BATTERY_CHARGING) ? TRUE : FALSE;
|
|
PowerState->Discharging = (PopCB.Status.PowerState & BATTERY_DISCHARGING) ? TRUE : FALSE;
|
|
PowerState->MaxCapacity = PopCB.Info.FullChargedCapacity;
|
|
PowerState->RemainingCapacity = PopCB.Status.Capacity;
|
|
PowerState->Rate = PopCB.Status.Current;
|
|
PowerState->EstimatedTime = PopCB.AdjustedEstTime;
|
|
PowerState->DefaultAlert1 = PopCB.Info.DefaultAlert1;
|
|
PowerState->DefaultAlert2 = PopCB.Info.DefaultAlert2;
|
|
|
|
PERFINFO_POWER_BATTERY_LIFE_INFO(PowerState->RemainingCapacity, PowerState->Rate);
|
|
|
|
return Status;
|
|
}
|