As of kernel 3.8, it looks like the function has changed and is now
returning -1 instead of 0:
static int cypress_get_finger_count(unsigned char header_byte)
{
unsigned char bits6_7;
int finger_count;
bits6_7 = header_byte >> 6;
finger_count = bits6_7 & 0x03;
if (finger_count == 1)
return 1;
if (header_byte & ABS_HSCROLL_BIT) {
/* HSCROLL gets added on to 0 finger count. */
switch (finger_count) {
case 0: return 4;
case 2: return 5;
default:
/* Invalid contact (e.g. palm). Ignore it. */
return -1;
}
}
return finger_count;
}
my guess is this is causing the same problem as returning 6 was before.
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https://bugs.launchpad.net/bugs/1048258
Title:
Cypress trackpad gets psmouse lost sync / driver resynced warnings
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