linux-kernel - Re: [virtio-dev] Re: [PATCH v3] Add virtio-input driver.

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Message-ID: <20150324160518.GA34117@dtor-ws>
Date:	Tue, 24 Mar 2015 09:05:18 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org,
	David Herrmann <dh.herrmann@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>
Subject: Re: [virtio-dev] Re: [PATCH v3] Add virtio-input driver.

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
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