[systemd-devel] Detecting inactive sessions

[Bastien Nocera]

On Wed, 2014-12-03 at 02:41 +0100, Lennart Poettering wrote:
> On Wed, 19.11.14 00:46, Bastien Nocera (hadess at hadess.net) wrote:
> 
> > On Tue, 2014-11-18 at 19:32 +0100, Bastien Nocera wrote:
> > > On Tue, 2014-11-11 at 16:46 +0100, Lennart Poettering wrote:
> > > <snip>
> > > > I am willing to take a patch for this, but then again, as I own a Yoga
> > > > I might look into this myself too one day.
> > > 
> > > If you can write the scaffolding for it, I'm happy writing the code that
> > > talks to the accelerometer, and that would make it work on your Yoga.
> > > I've already written that code once, and I should be able to transform
> > > it into something mergeable.
> > > 
> > > Do note that we would have to handle 3 types of accelerometers:
> > > - IIO with ring buffer (the type supported by iio-sensor-proxy and in
> > > the Yoga)
> > > - polling IIO (the type used in cheap tablets such as mine)
> > > - input device accelerometers (as present in the WeTab, and Dell Venue 8
> > > tablet, apparently)
> > 
> > I'll correct my own mail.
> > 
> > We want to handle 4 types of accelerometers:
> > - quaternion sensor IIO with ring buffer (the type present in some
> > Yogas)
> > - accelerometer IIO with ring buffer (the type supported by
> > iio-sensor-proxy and in the Yoga as well)
> > - polling IIO (the type used in cheap tablets such as mine)
> > - input device accelerometers (as present in the WeTab)
> > 
> > Given that range of devices, it makes less and less sense to me to put
> > it in systemd. I think that I might start thinking about a D-Bus API,
> > and expect interested desktops to use that instead of adding hardware
> > specific code in systemd.
> > 
> > What do you think?
> 
> Sounds OK to me too. As you prefer, especially if you are doing the
> work ;-)

There's support for items 2 and 3 in iio-sensor-proxy. Would be nice if
somebody with access to the quaternion sensor would write a driver for
it (probably re-using quite a bit from the accelerometer code), and
submit it.

The support for the input devices will need to happen at the same time
as the D-Bus API, as it replaces the udev accelerometer code.