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[idd] input: report volume keys as consumer controls

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Expose a Consumer Control HID report for the system volume usages that
Windows does not handle through the Keyboard/Keypad usage page.

Translate the existing mute and volume keyboard usages at the LGInput
boundary, preserve normal keyboard state, and force a neutral consumer
report across resets and HID device reactivation.
This commit is contained in:
Geoffrey McRae
2026-08-09 01:02:33 +10:00
parent ced2fb531e
commit 726086a969
5 changed files with 90 additions and 6 deletions
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26
idd/LGInput/CHIDDevice.cpp
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@@ -59,6 +59,7 @@ struct HIDDeviceContext
size_t reportCount;
uint32_t relativeButtons;
uint32_t absoluteButtons;
uint16_t consumerUsage;
bool absoluteValid;
uint16_t absoluteX;
uint16_t absoluteY;
@@ -326,9 +327,10 @@ static NTSTATUS DeactivateDevice(_Inout_ HIDDeviceContext * context)
if (context->stopping)
return STATUS_DEVICE_NOT_READY;
context->active = false;
context->reportHead = 0;
context->reportCount = 0;
context->active = false;
context->reportHead = 0;
context->reportCount = 0;
context->consumerUsage = UINT16_MAX;
}
WdfIoQueuePurgeSynchronously(context->reportQueue);
return STATUS_SUCCESS;
@@ -449,6 +451,11 @@ NTSTATUS CHIDDevice::SubmitReport(
status = STATUS_DEVICE_NOT_READY;
else
{
if (reportId == HID_REPORT_ID_CONSUMER &&
context->consumerUsage ==
static_cast<const HIDConsumerReport *>(report)->usage)
return STATUS_SUCCESS;
bool pureMotion = false;
switch (reportId)
{
@@ -510,6 +517,11 @@ NTSTATUS CHIDDevice::SubmitReport(
break;
}
case HID_REPORT_ID_CONSUMER:
context->consumerUsage =
static_cast<const HIDConsumerReport *>(report)->usage;
break;
default:
break;
}
@@ -546,6 +558,7 @@ NTSTATUS CHIDDevice::ResetReports()
context->mouseMode = 0;
context->relativeButtons = 0;
context->absoluteButtons = 0;
context->consumerUsage = UINT16_MAX;
}
const HIDMouseRelativeReport relative = {
@@ -558,6 +571,9 @@ NTSTATUS CHIDDevice::ResetReports()
const HIDKeyboardReport keyboard = {
HID_REPORT_ID_KEYBOARD,
};
const HIDConsumerReport consumer = {
HID_REPORT_ID_CONSUMER,
};
NTSTATUS status = SubmitReport(&relative, sizeof(relative));
if (absoluteValid)
@@ -578,6 +594,10 @@ NTSTATUS CHIDDevice::ResetReports()
SubmitReport(&keyboard, sizeof(keyboard));
if (NT_SUCCESS(status))
status = keyboardStatus;
const NTSTATUS consumerStatus =
SubmitReport(&consumer, sizeof(consumer));
if (NT_SUCCESS(status))
status = consumerStatus;
return status;
}