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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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17
idd/LGInput/HIDReports.cpp
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@@ -120,6 +120,20 @@ static const uint8_t REPORT_DESCRIPTOR[] =
0x95, 0x06, // Report Count (6)
0x81, 0x00, // Input (Data, Array, Absolute)
0xC0, // End Collection
// Consumer control, report ID 4.
0x05, 0x0C, // Usage Page (Consumer)
0x09, 0x01, // Usage (Consumer Control)
0xA1, 0x01, // Collection (Application)
0x85, HID_REPORT_ID_CONSUMER,
0x19, 0x00, // Usage Minimum (Unassigned)
0x2A, 0xFF, 0x03, // Usage Maximum (1023)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x03, // Logical Maximum (1023)
0x75, 0x10, // Report Size (16)
0x95, 0x01, // Report Count (1)
0x81, 0x00, // Input (Data, Array, Absolute)
0xC0, // End Collection
};
const uint8_t * HIDGetReportDescriptor()
@@ -145,6 +159,9 @@ size_t HIDGetInputReportSize(uint8_t reportId)
case HID_REPORT_ID_KEYBOARD:
return sizeof(HIDKeyboardReport);
case HID_REPORT_ID_CONSUMER:
return sizeof(HIDConsumerReport);
default:
return 0;
}