commit 3fa0bfbab1352b7fa907ae8b0199bd16b6e5d425
author Tejas Patil <tejaspp@ami.com> Thu Dec 23 15:44:47 2021 +0530
committer Tejas Pratap Patil <tejaspp@ami.com> Mon May 02 05:22:42 2022 +0000
tree 8c4255f7c82c16b24725523fd29e5ca1e5fa6a78
parent a4f63b38f1e72a3c34c54e275803d945b949483b

Add Mouse Wheel Scroll Events

This commit add support for mouse wheel scroll events in KVM.
It supports for mouse scroll up/down buttons, by which user can use
mouse wheel functionality.

Testing:
Tested mouse wheel functionality.
Verified mouse wheel scroll up/down functions.

Signed-off-by: Tejas Patil <tejaspp@ami.com>
Change-Id: I7f53f0f203a81b55f2377982571e8f415ed99df2

create_usbhid.sh

diff --git a/create_usbhid.sh b/create_usbhid.sh
index d1b9841..12eebd0 100644
--- a/create_usbhid.sh
+++ b/create_usbhid.sh
@@ -67,7 +67,7 @@
     mkdir functions/hid.1
 
     echo 2 > functions/hid.1/protocol	# 2: mouse
-    echo 5 > functions/hid.1/report_length
+    echo 6 > functions/hid.1/report_length
     echo 1 > functions/hid.1/subclass
 
     # Binary HID mouse descriptor (absolute coordinate)
@@ -99,9 +99,17 @@
     #  0x75, 0x10,       //     REPORT_SIZE (16)
     #  0x95, 0x02,       //     REPORT_COUNT (2)
     #  0x81, 0x02,       //     INPUT (Data,Var,Abs)
+    #  0x09, 0x38,       //     Usage (Wheel)
+    #  0x15, 0xff,       //     LOGICAL_MINIMUM (-1)
+    #  0x25, 0x01,       //     LOGICAL_MAXIMUM (1)
+    #  0x35, 0x00,       //     PHYSICAL_MINIMUM (-127)
+    #  0x45, 0x00,       //     PHYSICAL_MAXIMUM (127)
+    #  0x75, 0x08,       //     REPORT_SIZE (8)
+    #  0x95, 0x01,       //     REPORT_COUNT (1)
+    #  0x81, 0x06,       //     INPUT (Data,Var,Rel)
     #  0xc0,             //   END_COLLECTION
     #  0xc0              // END_COLLECTION
-    echo -ne '\x05\x01\x09\x02\xa1\x01\x09\x01\xa1\x00\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x95\x03\x75\x01\x81\x02\x95\x01\x75\x05\x81\x03\x05\x01\x09\x30\x09\x31\x35\x00\x46\xff\x7f\x15\x00\x26\xff\x7f\x65\x11\x55\x00\x75\x10\x95\x02\x81\x02\xc0\xc0' > functions/hid.1/report_desc
+    echo -ne '\x05\x01\x09\x02\xa1\x01\x09\x01\xa1\x00\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x95\x03\x75\x01\x81\x02\x95\x01\x75\x05\x81\x03\x05\x01\x09\x30\x09\x31\x35\x00\x46\xff\x7f\x15\x00\x26\xff\x7f\x65\x11\x55\x00\x75\x10\x95\x02\x81\x02\x09\x38\x15\xff\x25\x01\x35\x00\x45\x00\x75\x08\x95\x01\x81\x06\xc0\xc0' > functions/hid.1/report_desc
 
     # Create configuration
     mkdir configs/c.1

ikvm_input.cpp

diff --git a/ikvm_input.cpp b/ikvm_input.cpp
index 6e8ab26..cbbfdc4 100644
--- a/ikvm_input.cpp
+++ b/ikvm_input.cpp
@@ -213,8 +213,24 @@
         return;
     }
 
-    input->pointerReport[0] = ((buttonMask & 0x4) >> 1) |
-                              ((buttonMask & 0x2) << 1) | (buttonMask & 0x1);
+    if (buttonMask > 4)
+    {
+        input->pointerReport[0] = 0;
+        if (buttonMask == 8)
+        {
+            input->pointerReport[5] = 1;
+        }
+        else if (buttonMask == 16)
+        {
+            input->pointerReport[5] = 0xff;
+        }
+    }
+    else
+    {
+        input->pointerReport[0] = ((buttonMask & 0x4) >> 1) |
+                                  ((buttonMask & 0x2) << 1) | (buttonMask & 0x1);
+        input->pointerReport[5] = 0;
+    }
 
     if (x >= 0 && (unsigned int)x < video.getWidth())
     {

ikvm_input.hpp

diff --git a/ikvm_input.hpp b/ikvm_input.hpp
index 558251d..ac54220 100644
--- a/ikvm_input.hpp
+++ b/ikvm_input.hpp
@@ -61,7 +61,7 @@
   private:
     static constexpr int NUM_MODIFIER_BITS = 4;
     static constexpr int KEY_REPORT_LENGTH = 8;
-    static constexpr int PTR_REPORT_LENGTH = 5;
+    static constexpr int PTR_REPORT_LENGTH = 6;
 
     /* @brief HID modifier bits mapped to shift and control key codes */
     static constexpr uint8_t shiftCtrlMap[NUM_MODIFIER_BITS] = {