Re: a question about lid input device

[Zhang Rui <rui.zhang@intel.com>]

On Sun, 2010-07-04 at 16:35 +0800, Dmitry Torokhov wrote:
> On Mon, Jun 21, 2010 at 09:56:37PM -0400, Len Brown wrote:
> > Dmitry,
> > Is there a reason not to simply add a "state" attribute
> > to a LID input device?
> > 
> 
> Len,
> 
> There is no LED input device, there is an input device that happens to
> report EV_SW/SW_LID state. If we did that we'd need to add attributes
> for all types of switches, keys, current values of REL and ABS axis,
> min/max/fuzz/flat settings of ABS axis and so forth that input device
> might report. I do not think it is a good idea.
> 
I agree.
How about adding a field in uevent file that reports the switch status?

thanks,
rui
> > 
> > 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...
> > > 
> > 
>