On Tue, Sep 13, 2011 at 3:09 AM, Henrik Rydberg <rydberg@xxxxxxxxxxx> wrote: > Hi Jason, > >> Adds INPUT_PROP_POINTER or INPUT_PROP_DIRECT as necessary to the >> hardware supported by the Wacom driver. The DIRECT property is >> assigned to devices with an embedded screen (i.e. touchscreens >> and display tablets). The POINTER property is assigned to those >> without embedded screens. >> >> Signed-off-by: Jason Gerecke <killertofu@xxxxxxxxx> >> --- > > According to the discussion leading up to the properties interface > (https://lkml.org/lkml/2010/12/15/263), a tablet is a direct pointer > device, as opposed to a touchpad, which is an indirect pointer > device. The distinction determines the direction of two-finger scroll, > for instance. The question is then what behavior should be assigned to > a large tablet without an embedded screen. It should have POINTER set > for sure, but should it also have DIRECT set? Here are all the possible combinations based on my understanding of their intended usage. * Touch interface without screen should have POINTER only to indicate pointer needed and to treat absolute coordinates as relative movement. Relative movement is product's default behavior as documented in its own manual and what I think should be advertised by default. * Pen interface without screen should have both POINTER and DIRECT to indicate pointer needed and to treat absolute coordinates as absolute movement. * Touch interfaces with screen should have DIRECT only to indicate no pointer displayed and absolute coordinates as absolute movement. * Pen interface with screen should have DIRECT only to indicate no pointer displayed and absolute coordinates as absolute movement. * A Pen+Touch touchscreen (only the wacom_w8001.c), should have DIRECT only to indicate no pointer displayed and absolute coordinates as absolute movement. Assuming we all agree on those combination, then in the patch the Graphire and Intuos tablets are missing a DIRECT, the touchscreens are correct, and the Bamboo's need to add DIRECT for the PEN interface only. Chris -- 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
