I got the wheel mouse working after looking at the microsoft wheel.docx at http://msdn.microsoft.com/en-us/windows/hardware/gg487477.aspx
And this post at microchip forum, http://www.microchip.com/forums/tm.aspx?m=391435
If someone is looking for it, here is a simplified report descriptor which can be used to create a HID Report template in PSoC Designer.
char ReportDescriptor[118] = {
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x02, // USAGE (Mouse)
0xa1, 0x01, // COLLECTION (Application)
0x09, 0x02, // USAGE (Mouse)
0xa1, 0x02, // COLLECTION (Logical)
0x09, 0x01, // USAGE (Pointer)
0xa1, 0x00, // COLLECTION (Physical)
// ------------------------------ Buttons
0x05, 0x09, // USAGE_PAGE (Button)
0x19, 0x01, // USAGE_MINIMUM (Button 1)
0x29, 0x05, // USAGE_MAXIMUM (Button 5)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x05, // REPORT_COUNT (5)
0x81, 0x02, // INPUT (Data,Var,Abs)
// ------------------------------ Padding
0x75, 0x03, // REPORT_SIZE (3)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x03, // INPUT (Cnst,Var,Abs)
// ------------------------------ X,Y position
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x15, 0x81, // LOGICAL_MINIMUM (-127)
0x25, 0x7f, // LOGICAL_MAXIMUM (127)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x02, // REPORT_COUNT (2)
0x81, 0x06, // INPUT (Data,Var,Rel)
0xa1, 0x02, // COLLECTION (Logical)
// ------------------------------ Vertical wheel res multiplier
0x09, 0x48, // USAGE (Resolution Multiplier)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x35, 0x01, // PHYSICAL_MINIMUM (1)
0x45, 0x04, // PHYSICAL_MAXIMUM (4)
0x75, 0x02, // REPORT_SIZE (2)
0x95, 0x01, // REPORT_COUNT (1)
0xa4, // PUSH
0xb1, 0x02, // FEATURE (Data,Var,Abs)
// ------------------------------ Vertical wheel
0x09, 0x38, // USAGE (Wheel)
0x15, 0x81, // LOGICAL_MINIMUM (-127)
0x25, 0x7f, // LOGICAL_MAXIMUM (127)
0x35, 0x00, // PHYSICAL_MINIMUM (0) - reset physical
0x45, 0x00, // PHYSICAL_MAXIMUM (0)
0x75, 0x08, // REPORT_SIZE (8)
0x81, 0x06, // INPUT (Data,Var,Rel)
0xc0, // END_COLLECTION
0xa1, 0x02, // COLLECTION (Logical)
// ------------------------------ Horizontal wheel res multiplier
0x09, 0x48, // USAGE (Resolution Multiplier)
0xb4, // POP
0xb1, 0x02, // FEATURE (Data,Var,Abs)
// ------------------------------ Padding for Feature report
0x35, 0x00, // PHYSICAL_MINIMUM (0) - reset physical
0x45, 0x00, // PHYSICAL_MAXIMUM (0)
0x75, 0x04, // REPORT_SIZE (4)
0xb1, 0x03, // FEATURE (Cnst,Var,Abs)
// ------------------------------ Horizontal wheel
0x05, 0x0c, // USAGE_PAGE (Consumer Devices)
0x0a, 0x38, 0x02, // USAGE (AC Pan)
0x15, 0x81, // LOGICAL_MINIMUM (-127)
0x25, 0x7f, // LOGICAL_MAXIMUM (127)
0x75, 0x08, // REPORT_SIZE (8)
0x81, 0x06, // INPUT (Data,Var,Rel)
0xc0, // END_COLLECTION
0xc0, // END_COLLECTION
0xc0, // END_COLLECTION
0xc0 // END_COLLECTION
};
