Am 18.10.2017 um 18:13 schrieb Pavel Machek [off-list ref]:

On Wed 2017-10-18 17:52:22, H. Nikolaus Schaller wrote:

quoted

quoted

Am 18.10.2017 um 15:56 schrieb Pavel Machek [off-list ref]:

On Wed 2017-10-18 06:22:04, Tony Lindgren wrote:

quoted

* H. Nikolaus Schaller [off-list ref] [171018 05:49]:

quoted

quoted

Am 18.10.2017 um 14:28 schrieb Pavel Machek [off-list ref]:

So I started something, it is at.

https://github.com/pavelmachek/libbattery

My battery on n900 is currently uncalibrated (and charging), still it
gets some kind of estimation:

Battery -1 %
Seconds -1
State 1
Voltage 3.88 V
Battery 63 %

Of course, there's a lot more work to be done.

Nice start but not a solution to our problem.

Our problem is that people simply expect that for example https://packages.debian.org/wheezy/xfce/xfce4-battery-plugin
displays the battery percentage.

I think we could make things compatible with various battery apps by
having libbattery write back the capacity percentage and time remaining
to the kernel driver via sysfs or a dev entry. Then the kernel interface
can just display the data to whatever apps.

Hmm. This could be as simple as providing symlink from
/sys/class/power/userland-battery to some place writable by
userspace...

Well, please implement arbitrary symlinks in /sysfs...

Any reason why I'd like to do that?

I don't know if you like it or not.

But it appears to be a strict necessity to make your proposal of
"as simple as providing symlink from /sys/class/power/userland-battery
to some place writable by userspace" work.

So if a different solution to provide /sys/class/power/*-battery
is possible, it should probably be preferred and nobody will ask
you to do something you don't like.

BR,
Nikolaus

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