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List:       freedesktop-xorg
Subject:    Kdrive mouse driver writing help
From:       Orkie <orkie () orkiesrealm ! co ! uk>
Date:       2006-05-28 19:16:35
Message-ID: 22817795.206841148843793570.JavaMail.servlet () kundenserver
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Hi

I've been porting Kdrive (the Xfbdev server) to the GP2X (which runs Linux) and have \
got it to a point where you can use it with the GP2X controls. However, it is a bit \
of a hack. What I ended up doing was to run GPM in repeater mode so that the X server \
would be tricked into thinking that there is a bus mouse. I replaced the busParse \
function with one of my own. Running GPM in the background is a waste of resources, \
especially on such a limited system so I'd like to move everything to inside \
hw/kdrive/linux/mouse.c. Another advantage to doing this would be that USB mice \
(which can be plugged into the GP2X and accessed as a normal mouse would) could be \
supported using the existing code.

The problem is that to get the state of the buttons and joystick, you need to read \
and then process the output from /dev/GPIO in a special way. There is no header, you \
just read an 'unsigned long' whenever you want new values to be checked. Thus, I \
think (but I could be wrong about this) that it would be best to perform the read and \
all the processing within a single function if possible, but I'm having trouble \
getting the server to recognise that I want to use my own function, outside of the \
existing firmware due to the protocol identification code. I was thinking that maybe \
my driver could be used as a fallback if no mouse using any of the other protocols is \
found, but I can't even work out how to do that since KdEnqueueMouseEvent requires a \
KdMouseInfo as a parameter, which isn't created properly unless the driver it \
initialised properly, like the rest.

So basically, I was hoping that somebody could offer some guidance as to how to go \
about doing it. I will of course release the finished code, but whether there would \
be much point merging it into the freedesktop.org X server tree I don't know, because \
it would be fairly specific to the GP2X.

Thanks


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