Re: apple trackpad driver update
On Thu, 2005-03-31 at 00:50 +0200, Johannes Berg wrote:
> On Thu, 2005-03-31 at 08:35 +1000, Benjamin Herrenschmidt wrote:
>
> > > I've made a few updates today. Notable is the addition of yet another
> > > USB product ID for the 12" series and a fix for some trackpads that send
> > > 81 bytes in interrupt go as opposed to mine which sends 64 and 17 in two
> > > consecutive interrupts.
> >
> > Hrm ? Isn't 64 the max for an USB interrupt pipe ?
>
> Hm. Yes. (page 43 following of the USB 1.1 specs)
> There are two possibilities now:
> * Apple ignores that
> * behaviour difference between 2.6.10 (which he was using)
> and 2.6.11 (which I am using)
>
> But in the latter case, my driver still only allocates
> MAX(64,driver reported packet size)
> bytes for the buffer so I have no clue how that would work...
It might be something with the USB stack, you should ask on the
usb-devel list, Apple can't "ignore" that, it's simply not possible,
unless they actually send two packets and the USB stack itself is
coalescing them...
Ben.
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