linux-kernel - Re: [PATCH] HID: input: do not report stylus battery state as "full"

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Message-ID: <nycvar.YFH.7.76.2107152055360.8253@cbobk.fhfr.pm>
Date:   Thu, 15 Jul 2021 20:55:54 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Kenneth Albanowski <kenalba@...gle.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: input: do not report stylus battery state as
 "full"

On Tue, 29 Jun 2021, Dmitry Torokhov wrote:

> The power supply states of discharging, charging, full, etc, represent
> state of charging, not the capacity level of the battery (for which
> we have a separate property). Current HID usage tables to not allow
> for expressing charging state of the batteries found in generic
> styli, so we should simply assume that the battery is discharging
> even if current capacity is at 100% when battery strength reporting
> is done via HID interface. In fact, we were doing just that before
> commit 581c4484769e.
> 
> This change helps UIs to not mis-represent fully charged batteries in
> styli as being charging/topping-off.
> 
> Fixes: 581c4484769e ("HID: input: map digitizer battery usage")
> Reported-by: Kenneth Albanowski <kenalba@...gle.com>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

As there was no pushback from Bastien, I am queuing this for 5.15. Thanks,

-- 
Jiri Kosina
SUSE Labs