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

From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: "Clément VUCHENER" <clement.vuchener@gmail.com>
Cc: Harry Cutts <hcutts@chromium.org>,
	Peter Hutterer <peter.hutterer@who-t.net>,
	"open list:HID CORE LAYER" <linux-input@vger.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Jiri Kosina <jikos@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Nestor Lopez Casado <nlopezcasad@logitech.com>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 7/8] HID: logitech: Enable high-resolution scrolling on Logitech mice
Date: Thu, 25 Apr 2019 11:35:01 +0200	[thread overview]
Message-ID: <CAO-hwJKYtNMYEY1iFm-Nh0_+ZJBvPrXmBUPftwbuFd0ugqWVww@mail.gmail.com> (raw)
In-Reply-To: <CAM4jgCrT7fAm1gi0L=Ux1GyxdH26cP8e_Dy36dEHF6Lf2F0rAQ@mail.gmail.com>

On Thu, Apr 25, 2019 at 11:29 AM Clément VUCHENER
<clement.vuchener@gmail.com> wrote:
>
> Le jeu. 25 avr. 2019 à 10:45, Benjamin Tissoires
> <benjamin.tissoires@redhat.com> a écrit :
> >
> > On Thu, Apr 25, 2019 at 10:25 AM Clément VUCHENER
> > <clement.vuchener@gmail.com> wrote:
> > >
> > > Le jeu. 25 avr. 2019 à 09:40, Benjamin Tissoires
> > > <benjamin.tissoires@redhat.com> a écrit :
> > > >
> > > > Hi Clément,
> > > >
> > > > On Wed, Apr 24, 2019 at 5:34 PM Clément VUCHENER
> > > > <clement.vuchener@gmail.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?
> >
> > Damnit, you are correct, there is no such enforcement :/
> >
> > >
> > > >
> > > > >
> > > > > 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.
> >
> > OK, that's what I wanted to see.
> >
> > >
> > > hid-recorder takes hidraw nodes as parameters, how do I use it to
> > > record the initialization by the driver?
> >
> > You can't. But it doesn't really matter here because I wanted to check
> > what your mouse is actually sending after the initialization.
> >
> > So if I read correctly: the mouse is sending high res data but
> > evemu-recorder shows one REL_WHEEL event every 7/8 clicks?
>
> It is HID++ 1.0, there is no special high res data report, it sends
> standard HID mouse wheel report, but more of them.
>
> To be clear, here is a recording using the modified kernel. I moved
> the wheel one step up (8 events are generated), then one step down (8
> events again + a 2-event bump).
>
> # EVEMU 1.3
[snipped]
> E: 1.975014 8 00 00 00 00 00 00 01 00
>
> The hi-res events should +/-15 instead of +/-120, and less REL_WHEEL
> events should be generated. This looks like the multiplier is set to 1
> instead of 8.
>
> kernel log shows the multiplier is set but only for one of the two devices:
>
> input: Logitech G500 as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:046D:C068.0006/input/input25
> hid-generic 0003:046D:C068.0006: input,hidraw5: USB HID v1.11 Mouse
> [Logitech G500] on usb-0000:00:14.0-2/input0
> input: Logitech G500 Keyboard as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:046D:C068.0007/input/input26
> input: Logitech G500 Consumer Control as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:046D:C068.0007/input/input27
> hid-generic 0003:046D:C068.0007: input,hiddev97,hidraw6: USB HID v1.11
> Keyboard [Logitech G500] on usb-0000:00:14.0-2/input1
> input: Logitech G500 as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:046D:C068.0006/input/input30
> logitech-hidpp-device 0003:046D:C068.0006: input,hidraw5: USB HID
> v1.11 Mouse [Logitech G500] on usb-0000:00:14.0-2/input0
> logitech-hidpp-device 0003:046D:C068.0007: HID++ 1.0 device connected.
> logitech-hidpp-device 0003:046D:C068.0007: multiplier = 8
> input: Logitech G500 as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:046D:C068.0007/input/input31
> logitech-hidpp-device 0003:046D:C068.0007: input,hiddev97,hidraw6: USB
> HID v1.11 Keyboard [Logitech G500] on usb-0000:00:14.0-2/input1
>

Oh, now I see. And yes you are correct.

I wonder if we should not consider the mouse in hid-logitech-dj then.
And let hid-logitech-dj merge the 2 nodes together into one hidpp
device, and so we are facing a "regular" HID++ device which is
consistent.

Unfortunately, I am not sure I'll have the time to work on it this week :/

Cheers,
Benjamin

> >
> > > > > Le mer. 19 déc. 2018 à 21:35, Benjamin Tissoires
> > > > > <benjamin.tissoires@redhat.com> a écrit :
> > > > > >
> > > > > > On Wed, Dec 19, 2018 at 11:57 AM Clément VUCHENER
> > > > > > <clement.vuchener@gmail.com> wrote:
> > > > > > >
> > > > > > > Le sam. 15 déc. 2018 à 15:45, Clément VUCHENER
> > > > > > > <clement.vuchener@gmail.com> a écrit :
> > > > > > > >
> > > > > > > > Le ven. 14 déc. 2018 à 19:37, Harry Cutts <hcutts@chromium.org> a écrit :
> > > > > > > > >
> > > > > > > > > Hi Clement,
> > > > > > > > >
> > > > > > > > > On Fri, 14 Dec 2018 at 05:47, Clément VUCHENER
> > > > > > > > > <clement.vuchener@gmail.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