Allen_Hung@xxxxxxxx writes: > Dell - Internal Use - Confidential > Hi Ben, > > We have just confirmed the touchpad on Latitude E7470 is a PS/2 > device, not an I2C-HID input device. The code you listed is common > among many Dell products and the value of SDS0 should be provided > somewhere (I can't find it out) to specify a PS/2 device. > Thanks Allen, I rather suspected this; I suppose it's probably hard to find I2C-HID hardware that integrates a touchstick. This explains why SDS0 is 0 on my hardware. In this case I suppose this is yet another Alps device? I've tried bringing it up with all of the recent Alps protocols supported by the alps.ko driver but sadly nothing seems to emit multitouch events, so it seems likely that there is yet another protocol variant waiting to be implemented. Is there any chance you could see whether Alps might now be more willing to provide protocol documentation? If not, perhaps there's a Linux binary driver available? Cheers, - Ben
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