On 12/08/2010 07:20 PM, Ping Cheng wrote: > 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. Thanks for the confirmation. While at it, what are the units for the distance, for instance for the Cintiq? Henrik -- 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
