On Wed, Dec 8, 2010 at 10:05 AM, Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> wrote: > On Wed, Dec 08, 2010 at 09:46:04AM -0800, Chase Douglas wrote: >> On 12/07/2010 12:27 AM, Henrik Rydberg wrote: >> > Touch devices capable of hovering, i.e., fingers detected a distance >> > from the surface, are not supported by the current input MT >> > protocol. This patch adds ABS_MT_DISTANCE, which may be used to >> > indicate the distance between the contact and the surface. >> >> Have you given thought to calling it ABS_MT_Z instead? I have no real >> problem with ABS_MT_DISTANCE per se, but ABS_MT_Z is more clearly >> defined in my head. If I was new to MT development I may wonder if >> ABS_MT_DISTANCE had anything to do with distance between points or some >> other object. > > X/Y/Z imply that we fully engaged the device and it is 3 dimensional. > Distance says that we are approaching the device but have not directly > engaged it yet. > > I think ABS_DISTANCE was added at Pings request and ABS_MT_DISTANCE is > modeled after ST one. Ping, could you refresh my memory why we needed > ABS_DISTANCE? ABS_DISTANCE is used in wacom driver as the distance between the tool tip and the tablet. Ping -- 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
