Re: a question about lid input device

[Len Brown <lenb@kernel.org>]

Dmitry,
Is there a reason not to simply add a "state" attribute
to a LID input device?


thanks,
Len Brown, Intel Open Source Technology Center

On Sun, 13 Jun 2010, Henrique de Moraes Holschuh wrote:

> On Sun, 13 Jun 2010, Zhang Rui wrote:
> > Then we update the lid switch status when a Lid notification comes.
> > right?
> 
> Yes.
> 
> > Then, IMO, userspace can get the lid status
> > via /sys/class/input/inputX/uevent, right?
> 
> No, only through an IOCTL.
> 
> > /sys/class/input/input1/uevent:EV==21
> 
> That's an bitmap of al EV_EV it supports.
> 
> > /sys/class/input/input1/uevent:SW==1
> 
> That's an bitmap of al EV_SW it supports.
> 
> > Lid is opened but SW is set, I tried to close/open the lid and found
> > that this bit never changes. is there something I misunderstand? can we
> > get the lid status in userspace?
> 
> IOCTL(), only.
> 
> Since nobody got a input-utils standard package (or added something to
> util-linux) yet to do that (AFAIK anyway), it is a MAJOR annoyance for
> shell scripts that want to query EV_SW state...
>