On Sun, Jun 07, 2020 at 10:24:14PM +0200, Pavel Machek wrote:

On Fri 2020-06-05 19:33:28, Andrzej Pietrasiewicz wrote:

quoted

Userspace might want to implement a policy to temporarily disregard input
from certain devices.

Wow, you certainly cc a lot of lists.

quoted

An example use case is a convertible laptop, whose keyboard can be folded
under the screen to create tablet-like experience. The user then must hold
the laptop in such a way that it is difficult to avoid pressing the keyboard
keys. It is therefore desirable to temporarily disregard input from the
keyboard, until it is folded back. This obviously is a policy which should
be kept out of the kernel, but the kernel must provide suitable means to
implement such a policy.

Due to interactions with suspend/resume, a helper has been added for drivers
to decide if the device is being used or not (PATCH 1/7) and it has been
applied to relevant drivers (PATCH 2,4,5,6/7).

But is that a right way to implement it?

We want this for cellphones, too -- touchscreen should be disabled
while the device is locked in the pocket -- but we really want the
touchscreen hardware to be powered down in that case (because it keeps
SoC busy and eats a _lot_ of electricity).

But simplistic "receive an event and then drop it if device is
inhibited" does not allow that...

I do not think you read the entirety of this patch series...

Thanks.

-- 
Dmitry

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