linux-kernel - Re: [PATCH] HID: logitech-hidpp: add support for Unified Battery (1004) feature

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Message-ID: <bc65667903652a67f17b6b51a37a03f73309fe39.camel@archlinux.org>
Date:   Wed, 06 Jan 2021 18:48:27 +0000
From:   Filipe Laíns <lains@...hlinux.org>
To:     Bastien Nocera <hadess@...ess.net>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: logitech-hidpp: add support for Unified Battery
 (1004) feature

On Wed, 2021-01-06 at 10:34 +0100, Bastien Nocera wrote:
> On Mon, 2021-01-04 at 18:29 +0000, lains@...hlinux.org wrote:
> > From: Filipe Laíns <lains@...hlinux.org>
> > 
> > This new feature present in new devices replaces the old Battery
> > Level
> > Status (0x1000) feature. It keeps essentially the same information
> > for
> > levels (reporting critical, low, good and full) but makes these
> > levels
> > optional, the device exports a capability setting which describes
> > which
> > levels it supports. In addition to this, there is an optional
> > state_of_charge paramenter that exports the battery percentage.
> > 
> > This patch adds support for this new feature. There were some
> > implementation choices, as described below and in the code.
> > 
> > If the device supports the state_of_charge parameter, we will just
> > export the battery percentage and not the levels, which the device
> > might
> > still support.
> 
> I'm guessing that means no changes needed on the upower side?
> 
> Cheers
> 

Yes :)
I tested upower and all works as expected.

There will still be devices that only support battery voltage, so I might
implement the battery voltage to charge percentage in a future patch.

Cheers,
Filipe Laíns

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