From 688f2e673c81873779c848a55a81acd3493556b9 Mon Sep 17 00:00:00 2001
From: Robert Fisk <robert_fisk@fastmail.fm>
Date: Sun, 14 Jan 2018 00:04:42 +1300
Subject: [PATCH] Support HID mouse reports with an ID header (Lenovo)

---
 Downstream/Inc/downstream_hid.h | 1 +
 Downstream/Src/downstream_hid.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/Downstream/Inc/downstream_hid.h b/Downstream/Inc/downstream_hid.h
index b011aa8..bd559cf 100644
--- a/Downstream/Inc/downstream_hid.h
+++ b/Downstream/Inc/downstream_hid.h
@@ -51,6 +51,7 @@
 
 #define HID_ITEM_REPORT_SIZE        0x74        //'global' report size
 #define HID_ITEM_REPORT_COUNT       0x94        //'global' report count
+#define HID_ITEM_REPORT_ID          0x84
 
 #define HID_ITEM_INPUT              0x80        //'main' input
 #define HID_ITEM_INPUT_ABS          0x02
diff --git a/Downstream/Src/downstream_hid.c b/Downstream/Src/downstream_hid.c
index 859ea8a..1dc717a 100644
--- a/Downstream/Src/downstream_hid.c
+++ b/Downstream/Src/downstream_hid.c
@@ -152,6 +152,10 @@ static HAL_StatusTypeDef Downstream_HID_Mouse_ParseReportDescriptor(void)
             currentReportCount = ItemData;
             break;
 
+        case HID_ITEM_REPORT_ID:
+            currentReportBitIndex += 8;         //Rudimentary support for a single report ID
+            break;
+
         case HID_ITEM_INPUT:
             switch (currentUsagePage)
             {