On Tue, Aug 16, 2011 at 11:20 PM, Peter Hutterer
<[email protected]>wrote:
> On Tue, Aug 16, 2011 at 04:02:15PM -0700, Ping Cheng wrote:
> > I need to report a new value to the user-land for pad. We have the forth
> > (left strip), fifth (right strip), and sixth (abs wheel) axises in use.
> The
> > first three are unused because they are (kinda) reserved for X, Y, and
> > pressure although pad has none of them. Now, I need to report a new
> value.
> > If I use the sixth axis, we may have issue with wheels, which has a value
> of
> > 0 - 71. I plan to reserve one byte (0 - 255) for the new value. Since we
> can
> > inform X server that a tool (pad, that is) does not emit motion events,
> > maybe we can reuse the first axis? Then, how do we resolve the backward
> > compatibility issue?
> From the server source code:
> #define MAX_VALUATORS 36
> can't remember if that's arbitrary or due to the libXi implementation for
> inputproto 1.x but either way, we have enough valuators that we can add
> another one. I vaguely recall Alexia talking about some GIMP limitations
> for
> more than 6 valuators though.
Yeah, I remember that too. Hopefully that issue has been fixed by Gtk.
However, backward compatibility will still be an issue since I need to
support the older distros, such as RHEL5...
> > I don't know what I can call the new value yet. It will need to get
> through
> > the LKML's review when the kernel driver is ready. I am thinking to call
> it
> > "ABS_VOLUME", which represents the led that is turned on (yeah, we are
> going
> > to support LED in the driver).
>
>
> ABS_VOLUME for a LED???
>
Well, the LED_* defined in input.h does not fit the ones I am going to
report. Requesting for a new set of LED_* may have problem too. I am not
sure. I'll see where I can get when I start working on it.
> > Another way to report this value is through "xsetwacom get pad ". It has
> > less challenge to implement. But, is it a good solution? Please share
> your
> > thoughts.
>
> what does it do?
>
As I mentioned above, it tells the userland which LED is on/off. Basically
the generic status of the LEDs without default function associated. It will
be up to the app developers' to translate the status to the functions they
like.
Ping
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