[reactos] 01/01: [BATTC] Signal the wait battery tag event when notifying Battery Class

[George Bișoc]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b0680d65feeed36b931e7…

commit b0680d65feeed36b931e77f7ef861e8799725bc6
Author:     George Bișoc <george.bisoc(a)reactos.org>
AuthorDate: Sat Dec 14 13:48:46 2024 +0100
Commit:     George Bișoc <george.bisoc(a)reactos.org>
CommitDate: Tue Dec 17 14:23:33 2024 +0100

    [BATTC] Signal the wait battery tag event when notifying Battery Class
    
    BatteryClassStatusNotify is used by battery miniport drivers to notify the Battery
Class of a status change. This can either be a battery status change or battery tag
assignation, depending on what the device extension (namely the composite battery) waits
for.
    
    We do have implementation for EVENT_BATTERY_STATUS but not for EVENT_BATTERY_TAG. What
happens is when BatteryClassIoctl fails to query the battery tag because it has not yet
been assigned, the thread is stuck on waiting for the event object to be signaled,
forever.
    This tipically happens when a timeout of -1 (meaning the calling thread must wait
indefinitely) is supplied. The composite battery driver (COMPBATT) is responsible to
signal the Battery Class when a CM (Control Method) ACPI battery receives a tag, which
then this function will signal the event.
    
    CORE-18969
    CORE-19452
---
 drivers/battery/battc/battc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/battery/battc/battc.c b/drivers/battery/battc/battc.c
index 84ae9df061e..e724f720b5f 100644
--- a/drivers/battery/battc/battc.c
+++ b/drivers/battery/battc/battc.c
@@ -76,11 +76,13 @@ BatteryClassQueryWmiDataBlock(PVOID ClassData,
 BCLASSAPI
 NTSTATUS
 NTAPI
-BatteryClassStatusNotify(PVOID ClassData)
+BatteryClassStatusNotify(
+    _In_ PVOID ClassData)
 {
     PBATTERY_CLASS_DATA BattClass;
     PBATTERY_WAIT_STATUS BattWait;
     BATTERY_STATUS BattStatus;
+    ULONG Tag;
     NTSTATUS Status;
 
     DPRINT("Received battery status notification from %p\n", ClassData);
@@ -99,7 +101,14 @@ BatteryClassStatusNotify(PVOID ClassData)
     {
         case EVENT_BATTERY_TAG:
             ExReleaseFastMutex(&BattClass->Mutex);
-            DPRINT1("Waiting for battery is UNIMPLEMENTED!\n");
+            Status =
BattClass->MiniportInfo.QueryTag(BattClass->MiniportInfo.Context,
+                                                      &Tag);
+            if (!NT_SUCCESS(Status))
+                return Status;
+
+            ExAcquireFastMutex(&BattClass->Mutex);
+            KeSetEvent(&BattClass->WaitEvent, IO_NO_INCREMENT, FALSE);
+            ExReleaseFastMutex(&BattClass->Mutex);
             break;
 
         case EVENT_BATTERY_STATUS: