On Tuesday 17 May 2016 22:46:31 Allen_Hung@xxxxxxxx wrote: > Dell - Internal Use - Confidential > > On 05/17/2016 09:16 PM, Pali Rohár wrote: > > On Tuesday 17 May 2016 11:50:06 Ben Gamari wrote: > >> Pali Rohár <pali.rohar@xxxxxxxxx> writes: > >> > >>> Hi Ben! > >>> > >>> Maybe it could help you, look at my email sent to linux-input ML year > >>> ago: http://thread.gmane.org/gmane.linux.kernel.input/41210 > >> Hi Pali! > >> > >> Thanks, this looks great (assuming this is in fact the protocol spoken > >> by the E7470 hardware; perhaps Allen could confirm this?). I'll have a > >> go at rebasing this sometime soon, although it looks like this may take > >> a fair bit of work as the patch is of the usual... questionable quality > >> that you'd expect from a hardware vendor and on top of that the driver > >> itself seems to have evolved significantly. > > First you need to identify if your touchpad is ALPS or not. If not then > > work on rebasing is useless. > > > > To identify your touchpad there are two ways: > > > > 1) Disassemble laptop and look what is under palmrest/keyboard. Latitude > > laptops used to have good documentation how to do it (on official dell > > site) and older Exx40 series is not hard to detect it... > > > > 2) Look at ALPS detection code. Basically all (known) ALPS touchpad > > response to some PS/2 sequence with specific answer. So you can compile > > psmouse.ko/alps.c in debug mode and look if it fit detection or not. > > > > I suggest you to do this first investigation step. If touchpad is ALPS > > or not. I read that some Dell laptops uses synaptics touchpads, so there > > is non zero chance that touchpad could not be ALPS. > > > >>> Also try to look at dell drivers page, there could be linux package for > >>> your laptop with drivers. Lot of them used to be in dkms format > >>> (upstream source code with dell changes). > >>> > >> I've been unable to find a support package for my machine on the web > >> site. However, I'm also in touch with Dell through the usual support > >> channel so perhaps they'll be able to provide a more up-to-date code > >> drop. > > IIRC All (new) Latitude laptops can be configured with Ubuntu and in > > this case they come with preinstalled Ubuntu with that support package. > > > > So for sure contact Dell support and ask for it! You can also see Ubuntu > > as supported system in PDF material about those Latitudes... > > > >>> ALPS code from Dell were open source, it was just hard to find it and > >>> compile it on other then one kernel version. And harder to generate > >>> patch (like I did in above email)... > >>> > >> Right, as I said it looks like rebasing this code drop onto a recent > >> kernel might require quite some effort. > > Yes, it would not be simple. Plus for including into mainline kernel > > needs lot of cleaning (see that email thread). > > > >> I do wish that Dell would apply more pressure on their input device > >> vendors to take upstream support (or open protocol documentation) > >> seriously. It's very frustrating that we need to go through this same > >> process with every hardware iteration. > > If you will be 100% sure that touchpad is ALPS, I could contact ALPS > > people. They helped me a lot with fixing ALPS touchpad support for my > > E6440... > > > >> Thanks again for the reference, Pali! > >> > >> Cheers, > >> > >> - Ben > >> > > I am confirming with Alps team for what protocol version the E7470 Great! > device is speaking. In fact, they sent me the alps.c which support up > to V8 and they said it's their latest one. Currently alps.c in mainline kernel supports protocol versions V1 to V8. So V9 is missing. > It seems the driver is older than the patch provided in Pali's link > (that support up to V9) so I didn't put it here. That patch which I sent was generated from Ubuntu support package provided by Dell drivers download package. So somebody in Dell should know more about it... > Will get the answer back to you once they confirm with me. > > - Allen Ok, thanks! -- Pali Rohár pali.rohar@xxxxxxxxx -- 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
