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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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43
idd/LGInput/ipc/CInputPipeClient.cpp
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@@ -27,6 +27,14 @@
#include <string.h>
static constexpr uint8_t HID_KEYBOARD_USAGE_MUTE = 0x7f;
static constexpr uint8_t HID_KEYBOARD_USAGE_VOLUME_UP = 0x80;
static constexpr uint8_t HID_KEYBOARD_USAGE_VOLUME_DOWN = 0x81;
static constexpr uint16_t HID_CONSUMER_USAGE_MUTE = 0xe2;
static constexpr uint16_t HID_CONSUMER_USAGE_VOLUME_UP = 0xe9;
static constexpr uint16_t HID_CONSUMER_USAGE_VOLUME_DOWN = 0xea;
bool CInputPipeClient::Start()
{
m_lastSequence = 0;
@@ -209,14 +217,45 @@ bool CInputPipeClient::HandleKeyboard(
HIDKeyboardReport report = {};
report.reportId = HID_REPORT_ID_KEYBOARD;
report.modifiers = input.modifiers;
// The Consumer Control report carries one active array usage.
uint16_t consumerUsage = 0;
size_t keyIndex = 0;
for (size_t i = 0; i < LG_INPUT_KEYBOARD_KEY_COUNT; ++i)
{
if (input.keys[i] > LG_INPUT_KEYBOARD_USAGE_MAX)
return false;
report.keys[i] = input.keys[i];
switch (input.keys[i])
{
case HID_KEYBOARD_USAGE_MUTE:
if (!consumerUsage)
consumerUsage = HID_CONSUMER_USAGE_MUTE;
break;
case HID_KEYBOARD_USAGE_VOLUME_UP:
if (!consumerUsage)
consumerUsage = HID_CONSUMER_USAGE_VOLUME_UP;
break;
case HID_KEYBOARD_USAGE_VOLUME_DOWN:
if (!consumerUsage)
consumerUsage = HID_CONSUMER_USAGE_VOLUME_DOWN;
break;
default:
report.keys[keyIndex++] = input.keys[i];
break;
}
}
return SubmitReport(&report, sizeof(report));
if (!SubmitReport(&report, sizeof(report)))
return false;
const HIDConsumerReport consumer = {
HID_REPORT_ID_CONSUMER,
consumerUsage,
};
return SubmitReport(&consumer, sizeof(consumer));
}
bool CInputPipeClient::SubmitReport(