There is support in the spec for PS/2 guests believe it or not, it's just mostly undocumented. Coincidentally, I was actually the one who wrote the drivers for this in Benjamin's tree. Using that, we can actually just create a serio port that goes through the rmi4 driver and communicate with that using the normal TrackPoint driver. We have a working implementation of this here: https://github.com/bentiss/linux/tree/synaptics-rmi4-smbus-v4.2-rc6%2B Cheers, Stephen Chandler Paul On Wed, 2015-08-19 at 14:27 -0700, Dmitry Torokhov wrote: > On Wed, Aug 19, 2015 at 09:52:00AM -0400, Benjamin Tissoires wrote: > > On Tue, Aug 18, 2015 at 3:06 PM, Benjamin Tissoires > > <benjamin.tissoires@xxxxxxxxx> wrote: > > > Hi Nick, > > > > > > thanks for the report. > > > > > > On Mon, Aug 17, 2015 at 10:31 PM, Nick Bowler <nbowler@xxxxxxxxxx > > > > wrote: > > > > Hi, > > > > > > > > I'm not sure if this is actually a Linux issue but figured I'd > > > > at least > > > > report it here to start... > > > > > > > > I have a Lenovo Thinkpad X250, with the newfangled trackpoint > > > > buttons. > > > > I have a problem with missing button press or release events: > > > > sometimes > > > > pressing a button has no effect, and sometimes releasing a > > > > button has no > > > > effect (the latter is especially annoying, as the button > > > > remains depressed > > > > as far as any applications are concerned). > > > > > > > > After some testing, the problem apparently depends on the > > > > position of my > > > > hands over the touchpad. I can reliably reproduce it as > > > > follows: place > > > > two fingers on the touchpad, then press the button repeatedly. > > > > Watching > > > > with evtest, several events (could be either press or release) > > > > will > > > > simply be missin, although the kernel never does anything weird > > > > like > > > > send two release events in a row. There are no problems if > > > > there are > > > > 0 or 1 fingers on the touchpad. > > > > > > > > My current kernel version is 4.1.6, although the problem occurs > > > > in all > > > > versions that I tried. > > > > > > > > Here is the evtest result from placing two fingers on the > > > > touchpad, then > > > > pressing the left trackpoint button 10 times, counting 1 second > > > > between > > > > each press. As you can see, only 3 presses and 3 release > > > > events total > > > > were sent by the kernel, sometimes with many physical button > > > > presses > > > > between the press and its corresponding release: > > > > > > OK, so this is definitively weird. My first idea would be a > > > firmware > > > problem. I have asked Chandler to reproduce it on his t450 and > > > see if > > > we observe it on our laptops too. > > > > Update on this one : Chandler reproduced it on the t450, so it's > > likely that all of these sensors are affected. It is still unclear > > if > > it is a firmware bug or a driver problem, but the chances are huge > > that this is a firmware bug. Anyway, that's one more reason to push > > towards RMI4 over SMBus for these sensors: the bug is not present > > with > > this protocol :) > > By the way, how are we going to handle Trackpoint (PS/2 device) with > touchpads in RMI4 mode? I do not recall anything in RMI4 spec, but I > looked at it quite some time ago. > > Thanks. > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
