linux-kernel - Re: libbattery was Re: [RFC PATCH 5/5] power: generic-adc-battery: Add capacity handling

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Message-ID: <20171018135656.GA26432@amd>
Date:   Wed, 18 Oct 2017 15:56:56 +0200
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com,
        Marek Belisko <marek.belisko@...n-nandra.com>,
        robh+dt@...nel.org, linux-pm@...r.kernel.org,
        Marek Belisko <marek.belisko@...il.com>
Subject: Re: libbattery was Re: [RFC PATCH 5/5] power: generic-adc-battery:
 Add capacity handling

On Wed 2017-10-18 06:22:04, Tony Lindgren wrote:
> * H. Nikolaus Schaller <hns@...delico.com> [171018 05:49]:
> > > Am 18.10.2017 um 14:28 schrieb Pavel Machek <pavel@....cz>:
> > > 
> > > 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...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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