Implement protocol-aware mouse report output to support both boot
protocol (protocol 0) and report protocol (protocol 1).

Boot protocol: 4-byte reports (button, dx, dy, dz)
Report protocol: 6-byte reports with report ID 0x01 + pan byte

Both modes now support the 'pan' field for horizontal scrolling. The
distinction ensures correct behavior across different guest operating
systems and their HID implementations.

Signed-off-by: Soumyajyotii Ssarkar <soumyajyotisarkar23@gmail.com>
---
 hw/input/hid.c | 44 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 33 insertions(+), 11 deletions(-)

diff --git a/hw/input/hid.c b/hw/input/hid.c
index 457dbb0096..d0b7af7c13 100644
--- a/hw/input/hid.c
+++ b/hw/input/hid.c
@@ -403,20 +403,42 @@ int hid_pointer_poll(HIDState *hs, uint8_t *buf, int len)

     /* Appears we have to invert the wheel direction */
     dz = 0 - dz;
+    pan = 0 - pan;
     l = 0;
     switch (hs->kind) {
     case HID_MOUSE:
-        if (len > l) {
-            buf[l++] = e->buttons_state;
-        }
-        if (len > l) {
-            buf[l++] = dx;
-        }
-        if (len > l) {
-            buf[l++] = dy;
-        }
-        if (len > l) {
-            buf[l++] = dz;
+        if (hs->protocol == 0) {
+            if (len > l) {
+                buf[l++] = e->buttons_state;
+            }
+            if (len > l) {
+                buf[l++] = dx;
+            }
+            if (len > l) {
+                buf[l++] = dy;
+            }
+            if (len > l) {
+                buf[l++] = dz;
+            }
+        } else {
+            if (len > l) {
+                buf[l++] = 0x01;
+            }
+            if (len > l) {
+                buf[l++] = e->buttons_state;
+            }
+            if (len > l) {
+                buf[l++] = dx;
+            }
+            if (len > l) {
+                buf[l++] = dy;
+            }
+            if (len > l) {
+                buf[l++] = dz;
+            }
+            if (len > l) {
+                buf[l++] = pan;
+            }
         }
         break;

--
2.53.0