fl16: add interface association

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

tmk_core/protocol/usb_descriptor.c

@@ -462,9 +462,9 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor = {
     .SubClass                   = USB_CSCP_IADDeviceSubclass,
     .Protocol                   = USB_CSCP_IADDeviceProtocol,
 #else
-    .Class                      = USB_CSCP_NoDeviceClass,
-    .SubClass                   = USB_CSCP_NoDeviceSubclass,
-    .Protocol                   = USB_CSCP_NoDeviceProtocol,
+    .Class                      = 0xEF, // Miscellaneous // USB_CSCP_NoDeviceClass,
+    .SubClass                   = 0x02, // USB_CSCP_NoDeviceSubclass,
+    .Protocol                   = 0x01, // USB_CSCP_NoDeviceProtocol,
 #endif
 
     .Endpoint0Size              = FIXED_CONTROL_ENDPOINT_SIZE,
@@ -639,6 +639,18 @@ const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor = {
         .ConfigAttributes       = (USB_CONFIG_ATTR_RESERVED | USB_CONFIG_ATTR_REMOTEWAKEUP),
         .MaxPowerConsumption    = USB_CONFIG_POWER_MA(USB_MAX_POWER_CONSUMPTION)
     },
+    .Keyboard_Interface_Association = {
+        .Header = {
+            .Size               = sizeof(USB_Descriptor_Interface_Association_t),
+            .Type               = DTYPE_InterfaceAssociation
+        },
+        .FirstInterfaceIndex    = KEYBOARD_INTERFACE,
+        .TotalInterfaces        = 4,
+        .Class                  = HID_CSCP_HIDClass,
+        .SubClass               = HID_CSCP_BootSubclass,
+        .Protocol               = HID_CSCP_KeyboardBootProtocol,
+        .IADStrIndex            = NO_DESCRIPTOR,
+    },
 #ifndef KEYBOARD_SHARED_EP
     /*
      * Keyboard

tmk_core/protocol/usb_descriptor.h

@@ -57,6 +57,7 @@
  */
 typedef struct {
     USB_Descriptor_Configuration_Header_t Config;
+    USB_Descriptor_Interface_Association_t Keyboard_Interface_Association;
 
 #ifndef KEYBOARD_SHARED_EP
     // Keyboard HID Interface