On Wed, Feb 10, 2010 at 12:33 AM, Ping Cheng <[email protected]> wrote: > On Tue, Feb 9, 2010 at 8:05 PM, Chris Bagwell <[email protected]> wrote: >> Can someone double check following logic issue? There happens to be >> two places in log files below were first fingers Y values are same as >> second fingers Y values on kernel side. In those cases, it looks like >> this same value is not sent to X driver. >> >> While fingers were in proximity, it meant channel 1 kept its older Y >> value. When first coming in to proximity, it meant Y was at a zero >> value (from a memset() it seems) and some events got discarded because >> less then 3 events were received. > > If everything works properly (all data are different), channel 0 would > keep finger one data, channel 1 would keep finger 2 data, and channel > 2 would kees pad data, if the tablet has a pad. If there are > duplicated data, only the first one will be received by X driver as we > discussed before. > > In the case you described above, I think we need to copy the first > finger data to channel 1 (i.e., duplicate channel 1 with channel 0's > data) to avoid zeros. Please test this solution to see how it works.
If I go this route then it can't tell difference between case when channels X/Y values were meant to be the same and case when it just hasn't changed from previous value; resulting in unwanted jumps in the mismatch case. I think this code could be tricky to do on X side and unable to get 100% right. If there are enough bits in these overlapping values, how about we encode the channel # in the values to force them always unique? X can mask those out blindly and be somewhat backwards compatible with older kernels. There probably aren't enough bits for that though. If not that then maybe this. At least for duplicate fingers and their X/Y/pressure values, the second finger doesn't need to be so accurate I think so I could +/- 1 to values in kernel when I detect duplicates. ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev _______________________________________________ Linuxwacom-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
