# Re: \[PATCH 13/18\] Input: MT - toggle ABS\_PRESSURE pointer emulation

- From: Dmitry Torokhov \<dmitry.torokhov@gmail.com\>
- Date: 2022-01-07 22:07:55 
- List: linux-input
- Page: https://ratatoskr.run/linux-input/2022/01/8933781
- Thread: https://ratatoskr.run/linux-input/2021/12/8933714/t.md

```text
Hi Angela,

On Tue, Dec 21, 2021 at 07:17:38PM +0000, Angela Czubak wrote:
> Add a function to switch off ABS_PRESSURE generation if necessary.
> This may be helpful in case drivers want to generate ABS_PRESSURE events
> themselves from ABS_MT_PRESSURE.

This needs better explanation for why it is needed. I assume this is to
use ABS_PRESSURE to report "true force" for devices. If this is correct
then I believe we should define a new flag for input_mt_init_slots()
and check it here and also use it to calculate the force across contacts
in input_mt_sync_frame().

Or did I misunderstand the point?

Thanks.

-- 
Dmitry
```