[Qemu-devel] [PATCH v2 1/2] hw/usb/dev-hid: set bInterfaceProtocol to 0x00 for usb-tablet

[Phil Dennis-Jordan <phil@philjordan.eu>]

This should be non-zero for boot protocol devices only, which the usb-tablet is not.

A boot protocol of 0x02 specifically confuses OS X/macOS' HID driver stack, causing it to generate additional bogus HID events with relative motion in addition to the tablet's absolute coordinate events.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
 hw/usb/dev-hid.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/usb/dev-hid.c b/hw/usb/dev-hid.c
index 24d05f7..a23e5d4 100644
--- a/hw/usb/dev-hid.c
+++ b/hw/usb/dev-hid.c
@@ -144,7 +144,7 @@ static const USBDescIface desc_iface_tablet = {
     .bInterfaceNumber              = 0,
     .bNumEndpoints                 = 1,
     .bInterfaceClass               = USB_CLASS_HID,
-    .bInterfaceProtocol            = 0x02,
+    .bInterfaceProtocol            = 0x00,
     .ndesc                         = 1,
     .descs = (USBDescOther[]) {
         {
@@ -174,7 +174,7 @@ static const USBDescIface desc_iface_tablet2 = {
     .bInterfaceNumber              = 0,
     .bNumEndpoints                 = 1,
     .bInterfaceClass               = USB_CLASS_HID,
-    .bInterfaceProtocol            = 0x02,
+    .bInterfaceProtocol            = 0x00,
     .ndesc                         = 1,
     .descs = (USBDescOther[]) {
         {
-- 
2.3.2 (Apple Git-55)