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:

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On Tue, Mar 24, 2015 at 02:37:24PM +0100, Gerd Hoffmann wrote:

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  Hi,

quoted

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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