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

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Date:   Thu, 19 Oct 2017 19:20:51 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        sakari.ailus@...ux.intel.com,
        Marek Belisko <marek.belisko@...n-nandra.com>,
        khilman@...nel.org, Marek Belisko <marek.belisko@...il.com>,
        linux-pm@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
        kernel list <linux-kernel@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>, martijn@...xit.nl,
        robh+dt@...nel.org, abcloriens@...il.com,
        Pavel Machek <pavel@....cz>,
        Pali Rohár <pali.rohar@...il.com>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        clayton@...ftyguy.net, linux-omap <linux-omap@...r.kernel.org>,
        patrikbachan@...il.com,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        serge@...lyn.com
Subject: Re: libbattery was Re: [RFC PATCH 5/5] power: generic-adc-battery: Add capacity handling


> Am 19.10.2017 um 19:06 schrieb Tony Lindgren <tony@...mide.com>:
> 
> * H. Nikolaus Schaller <hns@...delico.com> [171019 09:57]:
>> Hi Tony,
>> 
>>> Am 19.10.2017 um 18:24 schrieb Tony Lindgren <tony@...mide.com>:
>>> 
>>> * H. Nikolaus Schaller <hns@...delico.com> [171018 08:49]:
>>>> 
>>>>> Am 18.10.2017 um 15:22 schrieb Tony Lindgren <tony@...mide.com>:
>>>>> 
>>>>> * 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.
>>>> 
>>>> Hm. That would be quite difficult to understand and maintain code.
>>> 
>>> How so? The libbattery can do it all, then the kernel drivers needing
>>> that will just display the most recent values to maintain compability
>>> with battery apps.
>> 
>> Well, it looks as if you are thinking about a much more complex solution
>> than I am...
>> 
>> The proposal we are discussing as
>> 
>> [RFC PATCH 5/5] power: generic-adc-battery: Add capacity handling
>> 
>> just reads the current voltage, charging current and uses a (nonlinear)
>> mapping to 0% .. 100%.
> 
> Right, I was discussing Pavel's libbattery link posted above. No
> comments on the current patch series.

Well, it was triggered by Sebastian's comment on this patch that 
some 10 years old Documentation recommends to write a libbattery.

And there is still some (weak) relation between the subject and libbattery.

> Let's move the libbattery stuff
> to a new thread to avoid confusion.

Agreed.

BR,
Nikolaus