linux-kernel - Re: [PATCH v3 7/8] HID: logitech: Enable high-resolution scrolling on Logitech mice

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Date:   Thu, 25 Apr 2019 10:24:58 +0200
From:   Clément VUCHENER <clement.vuchener@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Harry Cutts <hcutts@...omium.org>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jiri Kosina <jikos@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Nestor Lopez Casado <nlopezcasad@...itech.com>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 7/8] HID: logitech: Enable high-resolution scrolling on
 Logitech mice

Le jeu. 25 avr. 2019 à 09:40, Benjamin Tissoires
<benjamin.tissoires@...hat.com> a écrit :
>
> Hi Clément,
>
> On Wed, Apr 24, 2019 at 5:34 PM Clément VUCHENER
> <clement.vuchener@...il.com> wrote:
> >
> > Hi Benjamin,
> >
> > I tried again to add hi-res wheel support for the G500 with Hans de
> > Goede's latest patch series you've just merged in for-5.2/logitech, it
> > is much better but there is still some issues.
> >
> > The first one is the device index, I need to use device index 0
> > instead 0xff. I added a quick and dirty quirk (stealing in the
> > QUIRK_CLASS range since the normal quirk range looks full) to change
> > the device index assigned in __hidpp_send_report. After that the
> > device is correctly initialized and the wheel multiplier is set.
>
> Hmm, maybe we should restrain a little bit the reserved quirks...
> But actually, .driver_data and .quirks are both unsigned long, so you
> should be able to use the 64 bits.

Only on 64 bits architectures, or is the kernel forcing long integers
to be 64 bits everywhere?

>
> >
> > The second issue is that wheel values are not actually scaled
> > according to the multiplier. I get 7/8 full scroll event for each
> > wheel step. I think it happens because the mouse is split in two
> > devices. The first device has the wheel events, and the second device
> > has the HID++ reports. The wheel multiplier is only set on the second
> > device (where the hi-res mode is enabled) and does not affect the
> > wheel events from the first one.
>
> I would think this have to do with the device not accepting the
> command instead. Can you share some raw logs of the events (ideally
> with hid-recorder from
> https://gitlab.freedesktop.org/libevdev/hid-tools)?

I already checked with usbmon and double-checked by querying the
register. The flag is set and accepted by the device and it behaves
accordingly: it sends about 8 wheel events per step.

hid-recorder takes hidraw nodes as parameters, how do I use it to
record the initialization by the driver?

>
> Cheers,
> Benjamin
>
> >
> > Le mer. 19 déc. 2018 à 21:35, Benjamin Tissoires
> > <benjamin.tissoires@...hat.com> a écrit :
> > >
> > > On Wed, Dec 19, 2018 at 11:57 AM Clément VUCHENER
> > > <clement.vuchener@...il.com> wrote:
> > > >
> > > > Le sam. 15 déc. 2018 à 15:45, Clément VUCHENER
> > > > <clement.vuchener@...il.com> a écrit :
> > > > >
> > > > > Le ven. 14 déc. 2018 à 19:37, Harry Cutts <hcutts@...omium.org> a écrit :
> > > > > >
> > > > > > Hi Clement,
> > > > > >
> > > > > > On Fri, 14 Dec 2018 at 05:47, Clément VUCHENER
> > > > > > <clement.vuchener@...il.com> wrote:
> > > > > > > Hi, The G500s (and the G500 too, I think) does support the "scrolling
> > > > > > > acceleration" bit. If I set it, I get around 8 events for each wheel
> > > > > > > "click", this is what this driver expects, right? If I understood
> > > > > > > correctly, I should try this patch with the
> > > > > > > HIDPP_QUIRK_HI_RES_SCROLL_1P0 quirk set for my mouse.
> > > > > >
> > > > > > Thanks for the info! Yes, that should work.
> > > > >
> > > > > Well, it is not that simple. I get "Device not connected" errors for
> > > > > both interfaces of the mouse.
> > > >
> > > > I suspect the device is not responding because the hid device is not
> > > > started. When is hid_hw_start supposed to be called? It is called
> > > > early for HID_QUIRK_CLASS_G920 but later for other device. So the
> > > > device is not started when hidpp_is_connected is called. Is this
> > > > because most of the device in this driver are not real HID devices but
> > > > DJ devices? How should non-DJ devices be treated?
> > >
> > > Hi Clement,
> > >
> > > I have a series I sent last September that allows to support non DJ
> > > devices on logitech-hidpp
> > > (https://patchwork.kernel.org/project/linux-input/list/?series=16359).
> > >
> > > In its current form, with the latest upstream kernel, the series will
> > > oops during the .event() callback, which is easy enough to fix.
> > > However, I am currently trying to make it better as a second or third
> > > reading made me realized that there was a bunch of non-sense in it and
> > > a proper support would require slightly more work for the non unifying
> > > receiver case.
> > >
> > > I hope I'll be able to send out something by the end of the week.
> > >
> > > Cheers,
> > > Benjamin