void ApplePS2SynapticsTouchPad::
dispatchRelativePointerEventWithPacket( UInt8 * packet,
UInt32 packetSize )
{
//
// Process the three byte relative format packet that was retreived from the
// trackpad. The format of the bytes is as follows:
//
// 7 6 5 4 3 2 1 0
// -----------------------
// YO XO YS XS 1 M R L
// X7 X6 X5 X4 X3 X3 X1 X0 (X delta)
// Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 (Y delta)
//
UInt32 buttons = 0;
SInt32 dx, dy;
AbsoluteTime now;
if ( (packet[0] & 0x1) ) buttons |= 0x1; // left button (bit 0 in packet)
if ( (packet[0] & 0x2) ) buttons |= 0x2; // right button (bit 1 in packet)
if ( (packet[0] & 0x4) ) buttons |= 0x4; // middle button (bit 2 in packet)
dx = ((packet[0] & 0x10) ? 0xffffff00 : 0 ) | packet[1];
dy = -(((packet[0] & 0x20) ? 0xffffff00 : 0 ) | packet[2]);
clock_get_uptime(&now);
dispatchRelativePointerEvent(dx, dy, buttons, now);
}
void ApplePS2Mouse::dispatchRelativePointerEventWithPacket(UInt8 * packet,
UInt32 packetSize)
{
//
// Process the three byte mouse packet that was retreived from the mouse.
// The format of the bytes is as follows:
//
// 7 6 5 4 3 2 1 0
// YO XO YS XS 1 M R L
// X7 X6 X5 X4 X3 X3 X1 X0
// Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
// Z7 Z6 Z5 Z4 Z3 Z2 Z1 Z0 <- fourth byte returned only for Intellimouse type
//
// 0 0 B5 B4 Z3 Z2 Z1 Z0 <- fourth byte for 5-button wheel mouse mode
//
UInt32 buttons = 0;
SInt32 dx;
SInt32 dy;
SInt16 dz = 0;
AbsoluteTime now;
if ( (packet[0] & 0x1) ) buttons |= 0x1; // left button (bit 0 in packet)
if ( (packet[0] & 0x2) ) buttons |= 0x2; // right button (bit 1 in packet)
if ( (packet[0] & 0x4) ) buttons |= 0x4; // middle button (bit 2 in packet)
dx = ((packet[0] & 0x10) ? 0xffffff00 : 0 ) | packet[1];
dy = -(((packet[0] & 0x20) ? 0xffffff00 : 0 ) | packet[2]);
clock_get_uptime((uint64_t *)&now);
if ( packetSize > 3 )
{
// Pull out fourth and fifth buttons.
if (_type == kMouseTypeIntellimouseExplorer)
{
if (packet[3] & 0x10) buttons |= 0x8; // fourth button (bit 4 in packet)
if (packet[3] & 0x20) buttons |= 0x10; // fifth button (bit 5 in packet)
}
dispatchRelativePointerEvent(dx, dy, buttons, now);
//
// We treat the 4th byte in the packet as a 8-bit signed Z value.
// There are mice that can report only 4-bits for the Z data, and
// use two of the remaining 4 bits for buttons 4 and 5. To enable
// the 5-button mouse mode, the command sequence should be:
//
// setMouseSampleRate(200);
// setMouseSampleRate(200);
// setMouseSampleRate(80);
//
// Those devices will return 0x04 for the device ID.
//
// %%KCD - As it turns out, the valid range for scroll data from
// PS2 mice is -8 to +7, thus the upper four bits are just a sign
// bit. If we just sign extend the lower four bits, the scroll
// calculation works for normal scrollwheel mice and five button mice.
dz = (SInt16)(((SInt8)(packet[3] << 4)) >> 4);
if ( dz )
{
//
// The Z counter is negative on an upwards scroll (away from the user),
// and positive when scrolling downwards. Invert this before passing to
// HID/CG.
//
dispatchScrollWheelEvent(-dz, 0, 0, now);
}
}
else
{
