linux-kernel - Re: [PATCH] HID: wacom: Correct power

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Date:   Thu, 21 Apr 2022 10:13:52 -0700
From:   Jason Gerecke <killertofu@...il.com>
To:     Bastien Nocera <hadess@...ess.net>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Linux Input <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Ping Cheng <ping.cheng@...om.com>,
        Jason Gerecke <jason.gerecke@...om.com>
Subject: Re: [PATCH] HID: wacom: Correct power_supply type

On Wed, Apr 20, 2022 at 1:52 AM Bastien Nocera <hadess@...ess.net> wrote:
>
> On Wed, 2022-04-13 at 07:59 -0700, Jason Gerecke wrote:
> > Following up on my previous comment. I've been able to test this
> > patch
> > with both flavors of wireless interface. Both Bluetooth (Intuos Pro)
> > and dongle-based (Intuos5) appear to have mostly-correct behavior
> > while charging and discharging, even when the battery level gradually
> > drops to zero. The misbehaviors I see appear to be limited to upower
> > mis-categorizing the devices as an e.g. keyboard or generic battery
> > rather than as a tablet. This leads to some slightly confusing UI
> > issues (e.g. GNOME and KDE referring to the device incorrectly), but
> > nothing too annoying. If upower is taught to recognize tablets under
> > more circumstances those issues should disappear.
> >
> > Ping tells me you may have an Intuos4 Wireless, Bastien? Any
> > additional testing you can do with that device would be appreciated,
> > though even without it I'm personally comfortable enough to provide
> > an
> > ack:
> >
> > Acked-by: Jason Gerecke <jason.gerecke@...om.com>
>
> Only devices I have is the original Wacom Graphire Bluetooth, and a
> wired Intuos4 (PTK-640) which I think changed names not long after.
>
> This might be enough:
> https://gitlab.freedesktop.org/upower/upower/-/merge_requests/127
>
> Please file an issue with the info discussed in the previous mail if it
> isn't.
>

Thanks Bastien, it seems to do the trick for Bluetooth devices but
needs a little more work for the dongle-based Intuos5. I've filed a
new issue with some suggestions as requested:
https://gitlab.freedesktop.org/upower/upower/-/issues/182

Jason
---
Now instead of four in the eights place /
you’ve got three, ‘Cause you added one  /
(That is to say, eight) to the two,     /
But you can’t take seven from three,    /
So you look at the sixty-fours....

> Cheers
>
> >
> > Jason
> > ---
> > Now instead of four in the eights place /
> > you’ve got three, ‘Cause you added one  /
> > (That is to say, eight) to the two,     /
> > But you can’t take seven from three,    /
> > So you look at the sixty-fours....
> >
> > On Tue, Apr 12, 2022 at 1:53 AM Jiri Kosina <jikos@...nel.org> wrote:
> > >
> > > On Thu, 7 Apr 2022, Bastien Nocera wrote:
> > >
> > > > POWER_SUPPLY_TYPE_USB seems to only ever be used by USB ports
> > > > that are
> > > > used to charge the machine itself (so a "system" scope), like the
> > > > single USB port on a phone, rather than devices.
> > > >
> > > > The wacom_sys driver is the only driver that sets its device
> > > > battery as
> > > > being a USB type, which doesn't seem correct based on its usage,
> > > > so
> > > > switch it to be a battery type like all the other USB-connected
> > > > devices.
> > > >
> > > > Signed-off-by: Bastien Nocera <hadess@...ess.net>
> > > > ---
> > > >  drivers/hid/wacom_sys.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
> > > > index 066c567dbaa2..620fe74f5676 100644
> > > > --- a/drivers/hid/wacom_sys.c
> > > > +++ b/drivers/hid/wacom_sys.c
> > > > @@ -1777,7 +1777,7 @@ static int
> > > > __wacom_initialize_battery(struct wacom *wacom,
> > > >       bat_desc->get_property = wacom_battery_get_property;
> > > >       sprintf(battery->bat_name, "wacom_battery_%ld", n);
> > > >       bat_desc->name = battery->bat_name;
> > > > -     bat_desc->type = POWER_SUPPLY_TYPE_USB;
> > > > +     bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
> > > >       bat_desc->use_for_apm = 0;
> > > >
> > > >       ps_bat = devm_power_supply_register(dev, bat_desc,
> > > > &psy_cfg);
> > >
> > > Thanks Bastien, makes sense. CCing Jason and Ping (the Wacom driver
> > > maintainers) to get their Ack.
> > >
> > > --
> > > Jiri Kosina
> > > SUSE Labs
> > >
>