On Jun 14, 2005, at 7:56 PM, Jeff Schindler wrote:
Why do you think that you need your own driver? In any case, the
This is for a high-performance, game oriented mouse - the thought
was that in order to get the best performance that we should roll
our own driver.
Are you experiencing a performance problem with the default mouse
driver? In general, the best approach is to start simple and only
optimize anything that is shown to need it. Assuming that the
default implementation needs replacing will lead you to write a lot
of unnecessary code (and you won't even know if you are actuall
faster if you didn't baseline first).
IOUSBHIDDriver is the driver for any mouse device. The
AppleUSBOpticalMouse is just a vendor-specific driver that issues
some commands to the driver. I would try to make your device
work with the HID driver. Use the HID lib to communicate with
your device from user space.
We also intend on having a preferences panel for controlling the
parameters for the mouse - so, in theory, utilizing the default HID
driver may serve our purposes? Assuming we do roll our own driver,
would we subclass IOUSBHIDDriver or IOHIPointing, and would we need
our own user client class for that?
If all you are communicating is prefs, then it will be easier for you
to just use the IORegistry to communicate and avoid writing a new
IOUserClient.
If your driver is targeted for Tiger or later, there is an easier
way to write a mouse driver. In Tiger, I added the following in
kernel
Right now, unless we can convince otherwise, we are targeting 10.3
and up.
I think the thing to do is dig in and start with a bare-bones
(perhaps codeless?) custom driver to at least match our device and
then go from there. I just need a small push in the right direction.
Yep - that sounds like the best approach to me.
Cheers,
- Dean
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