From 0cd089e937f28a1f6f4db711f643df36f8f5dfe3 Mon Sep 17 00:00:00 2001 From: Phil Dennis-Jordan Date: Wed, 25 Jan 2017 18:24:35 +0100 Subject: [PATCH] hw/usb/dev-hid: Improve guest compatibility of usb-tablet 1. Set bInterfaceProtocol to 0x00 for usb-tablet. This should be non-zero for boot protocol devices only, which the usb-tablet is not. 2. Set the usb-tablet's usage to "mouse" in the report descriptor. The boot protocol of 0x02 specifically confused 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. Absolute pointing devices with HID Report Descriptor usage of 0x01 (pointing) are treated by the macOS HID driver as analog sticks, and absolute coordinates are not directly translated to absolute mouse cursor positions. Changing it to 0x02 (mouse) fixes the problem, and does not have any adverse effect in other operating systems and windowing systems. (VMWare does the same thing.) Signed-off-by: Phil Dennis-Jordan Message-id: 1485365075-32702-1-git-send-email-phil@philjordan.eu Signed-off-by: Gerd Hoffmann --- hw/usb/dev-hid.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/hw/usb/dev-hid.c b/hw/usb/dev-hid.c index 24d05f76f9..dda0bf0df0 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[]) { { @@ -487,7 +487,7 @@ static const uint8_t qemu_mouse_hid_report_descriptor[] = { static const uint8_t qemu_tablet_hid_report_descriptor[] = { 0x05, 0x01, /* Usage Page (Generic Desktop) */ - 0x09, 0x01, /* Usage (Pointer) */ + 0x09, 0x02, /* Usage (Mouse) */ 0xa1, 0x01, /* Collection (Application) */ 0x09, 0x01, /* Usage (Pointer) */ 0xa1, 0x00, /* Collection (Physical) */