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Message-Id: <308D4E97-E80F-406B-95DE-2AD4D4DBCF03@goldelico.com>
Date: Wed, 18 Oct 2017 18:48:36 +0200
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Pavel Machek <pavel@....cz>
Cc: Tony Lindgren <tony@...mide.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
> Am 18.10.2017 um 18:13 schrieb Pavel Machek <pavel@....cz>:
>
> On Wed 2017-10-18 17:52:22, H. Nikolaus Schaller wrote:
>>
>>> Am 18.10.2017 um 15:56 schrieb Pavel Machek <pavel@....cz>:
>>>
>>> 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...
>>
>> 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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