On 12/15/2010 02:20 PM, Henrik Rydberg wrote: > Today, userspace sets up an input device based on the data it emits. > This is not always enough; a tablet and a touchscreen may emit exactly > the same data, for instance, but the former should be set up with a > pointer whereas the latter does not need to. Recently, a new type of > touchpad has emerged where the buttons are under the pad, which > changes handling logic without changing the emitted data. This patch > introduces a new ioctl, EVIOCGPROP, which enables user access to a set > of device properties useful during setup. The properties are given as > a bitmap in the same fashion as the event types. > > Signed-off-by: Henrik Rydberg <rydberg@xxxxxxxxxxx> > --- > Hi all, > > Here is version two of the device information proposal. In addition to > implementing the feedback, this version only defines a single combined > type/capabilities field. Since we want to support a device being of > multiple types, it suggests that we are really after the properties > that make up a type, rather than the types themselves. And since > quirks are also properties, we end up with a single bitmap of > properties instead. > > As an example of how this would work for the > touchpad/tablet/touchscreen triplet, there are two properties defined, > INPUT_PROP_POINTER and INPUT_PROP_DIRECT. A touchpad is an indirect > pointer device, a tablet is a direct pointer device, and the > touchscreen is simply a direct device. > > What do you think? I must have missed the first version of this patch, but I give two thumbs way up :). The detection code for touchpad/tablet/touchscreen in xf86-input-evdev is large and unwieldy, and seemingly simple changes to an input driver can cause incorrect interpretation. Having this available should help quite a bit! Acked-by: Chase Douglas <chase.douglas@xxxxxxxxxxxxx> -- 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
