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Filter bad mouse data. This prevents random jumping of the cursor, as observed on some systems.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20904 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Marcus Overhagen 2007-04-29 17:05:07 +00:00
parent 14342a6767
commit f7c789146d
1 changed files with 24 additions and 1 deletions
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25
src/add-ons/kernel/bus_managers/ps2/ps2_mouse.c
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@ -219,10 +219,33 @@ mouse_handle_int(ps2_dev *dev)
const uint8 data = dev->history[0].data;
if (cookie->packet_index == 0 && !(data & 8)) {
TRACE("ps2: bad mouse data, trying resync\n");
INFO("ps2: bad mouse data, trying resync\n");
return B_HANDLED_INTERRUPT;
}
// Workarounds for active multiplexing keyboard controllers
// that lose data or send them to the wrong port.
if (cookie->packet_index == 0 && (data & 0xc0)) {
INFO("ps2: strange mouse data, x/y overflow, trying resync\n");
return B_HANDLED_INTERRUPT;
}
if (cookie->packet_index == 1) {
int xDelta = ((cookie->packet_buffer[0] & 0x10) ? 0xFFFFFF00 : 0) | data;
if (xDelta < -100 || xDelta > 100) {
INFO("ps2: strange mouse data, x-delta %d, trying resync\n", xDelta);
cookie->packet_index = 0;
return B_HANDLED_INTERRUPT;
}
}
if (cookie->packet_index == 2) {
int yDelta = ((cookie->packet_buffer[0] & 0x20) ? 0xFFFFFF00 : 0) | data;
if (yDelta < -100 || yDelta > 100) {
INFO("ps2: strange mouse data, y-delta %d, trying resync\n", yDelta);
cookie->packet_index = 0;
return B_HANDLED_INTERRUPT;
}
}
cookie->packet_buffer[cookie->packet_index++] = data;
if (cookie->packet_index != cookie->packet_size) {