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

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Message-ID: <20171018132204.GD4394@atomide.com>
Date:   Wed, 18 Oct 2017 06:22:04 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Pavel Machek <pavel@....cz>,
        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

* 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.

Regards,

Tony