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Date: Tue, 24 Mar 2015 09:05:18 -0700
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>, virtio-dev@lists.oasis-open.org,
        virtualization@lists.linux-foundation.org,
        David Herrmann <dh.herrmann@gmail.com>,
        Rusty Russell <rusty@rustcorp.com.au>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:ABI/API" <linux-api@vger.kernel.org>
Subject: Re: [virtio-dev] Re: [PATCH v3] Add virtio-input driver.
Message-ID: <20150324160518.GA34117@dtor-ws>
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On Tue, Mar 24, 2015 at 04:25:14PM +0100, Gerd Hoffmann wrote:
> On Di, 2015-03-24 at 15:14 +0100, Michael S. Tsirkin wrote:
> > On Tue, Mar 24, 2015 at 02:37:24PM +0100, Gerd Hoffmann wrote:
> > >   Hi,
> > > 
> > > > > input layer checks it and ignores events not supported (according to the
> > > > > support bitmaps).
> > > > 
> > > > Right but support bitmaps come from host too, no?
> > > 
> > > Yes, but the driver will not set invalid bits (bitcount argument for the
> > > virtinput_cfg_bits() function is the number of valid bits of the
> > > specific bitmap).
> > > 
> > > cheers,
> > >   Gerd
> > > 
> > > 
> > > 
> > 
> > Question: does linux ever get such events from userspace
> > as opposed to sending them to userspace?
> 
> Yes, it's possible using the userspace input driver
> (CONFIG_INPUT_UINPUT)

No, not through uinput (as from kernel POV uinput is also a driver), but
users can write into evdev.

Sending unknown codes is OK: events of unknown type will be dropped by
the input core, unknown event codes will be passed on; users not
recognizing event code should simply ignore it.

Thanks.

-- 
Dmitry