Re: [PATCH v4 2/9] [media] v4l2-core: Add VFL_TYPE_TOUCH_SENSOR

On Wed, 22 Jun 2016, Nick Dyer wrote:

On 22/06/2016 12:48, Florian Echtler wrote:

quoted

On 20.06.2016 14:00, Hans Verkuil wrote:

quoted

On 06/17/2016 04:16 PM, Nick Dyer wrote:

quoted

Use a new device prefix v4l-touch for these devices, to stop generic
capture software from treating them as webcams.

quoted

Come to think of it, wouldn't it make sense to expose the other touch
devices as generic frame grabbers, too, so you can easily view the debug
output with any generic tool like cheese?

While I like the idea of being able to use the generic tools, I think we
needed to do something to stop these devices turning up in e.g. video
conferencing software - it would cause a lot of confusion. There's nothing
stopping particular tools adding the necessary code to handle touch devices
if they feel their users want it.

Just to clarify: from the userspace point-of-view, would this change 
simply modify the prefix of the device node (i.e. /dev/video1 -> 
/dev/v4l-touch1), or would it somehow affect the API? If it's just the 
device node name, then that shouldn't be a problem after all, because e.g. 
reacTIVision requires you to specify the exact camera to be used anyway.

Florian
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