linux-kernel - Re: What's in hid.git for 2.6.30

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Date:	Fri, 1 May 2009 18:09:19 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Guillaume Chazarain <guichaz@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: What's in hid.git for 2.6.30

Am Friday 01 May 2009 17:54:39 schrieben Sie:
> On Fri, 1 May 2009, Oliver Neukum wrote:
> > > > > +       if (!(hid->claimed & HID_CLAIMED_INPUT))
> > > > > +               return 0;
> > > > > +
> > > >
> > > > is there a guarantee all keyboards will be claimed as input devices?
> > >
> > > do you see any way how hid->inputs could currently be initialized other
> > > than the device being claimed by hid-input?
> >
> > No, but I am worried about a false return of 0 here, not the other way
> > round. This method is necessary because keyboards don't wake up
> > if a key is released. Suspending a keyboard with a key pressed will lead
> > to an endless repetition of that key.
> > So I wonder whether it is possible to have a keyboard not claimed as an
> > input device.
>
> If driven by usbhid, the only way how keyboard could be handled if not
> claimed by hid-input is a userspace hiddev or hidraw driver. And we don't
> suspend if hidraw/hiddev node is open, right?

What happens if the node is closed? Will hid forget that a key had
been pressed? I must admit that I can't tell where in hid the key repetition
logic is located.

	Regards
		Oliver

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