linux-kernel - Re: [PATCH 2/2] HID: multitouch: enable the Surface 3 Type Cover to report multitouch data

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Date:	Wed, 15 Jun 2016 16:28:13 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Jiri Kosina <jikos@...nel.org>, Bastien Nocera <hadess@...ess.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] HID: multitouch: enable the Surface 3 Type Cover to
 report multitouch data

On Jun 13 2016 or thereabouts, Andy Shevchenko wrote:
> On Fri, 2016-06-03 at 15:32 +0200, Benjamin Tissoires wrote:
> > On Jun 03 2016 or thereabouts, Andy Shevchenko wrote:
> > > On Fri, 2016-06-03 at 14:23 +0200, Benjamin Tissoires wrote:
> > > 
> > > > On Jun 03 2016 or thereabouts, Andy Shevchenko wrote:
> > > > > On Fri, 2016-06-03 at 11:38 +0200, Benjamin Tissoires wrote:
> > > > > > On Jun 02 2016 or thereabouts, Andy Shevchenko wrote:
> > > > > > > On Thu, 2016-06-02 at 16:11 +0200, Benjamin Tissoires wrote:
> > > 
> > > 
> > > > > > > I take linux-next + your two patches from this thread (+
> > > > > > > some
> > > > > > > unrelated
> > > > > > > to HID patches).
> > > > > > 
> > > > > > OK. I think I know what happened:
> > > > > > - Microsoft forgot to put the Win 8 certification blob in this
> > > > > >   particular device (of course, because Microsoft)
> > > > > > - we do not detect it as a Win 8 certified and do not set the
> > > > > >   HID_QUIRK_NO_INIT_REPORTS flag
> > > > > > - your dmesg should show some error on plug, and then hid
> > > > > > can't
> > > > > > set
> > > > > > the
> > > > > >   input mode
> > > > > > - I can't add a "if win 8 then show the mouse collection"
> > > > > > because
> > > > > > your
> > > > > >   device doesn't report itself as win 8 :)
> > > > > > 
> > > > > > Anyway, could you try applying this small diff after my 2
> > > > > > patches
> > > > > > and
> > > > > > report if you now have a working touchpad?:
> > > > > 
> > > > > Nope. There is still no /dev/input/eventX associated with
> > > > > touchpad.
> > > > 
> > > > Weird. On my system, if I replay your logs, I see 4 new nodes:
> > > > /dev/input/event21:	Microsoft Surface Keyboard Keyboard
> > > > /dev/input/event22:	Microsoft Surface Keyboard Consumer
> > > > Control
> > > > /dev/input/event23:	Microsoft Surface Keyboard Touchpad
> > > > /dev/input/event24:	Microsoft Surface Keyboard Keyboard
> > > 
> > > I had a line in dmesg that input8 is allocated to Touchpad, but no
> > > eventX (0..6 IIRC) from /dev/input reflects Touchpad events. I can
> > > get
> > > them only via /dev/usb/hiddev0.
> > > 
> > > > 
> > > > Can you attach the dmesg when plugging in the type cover?
> > > > 
> > > 
> > > I will do later, but there is no such thing 'plugging in'. It's a
> > > part
> > > of the notebook, so, I can do detach-attach cycle, though it
> > > shouldn't
> > > matter, it should work immediately after boot I suppose.
> > > 
> > 
> > Actually, if the touchpad doesn't want to be set to the multitouch
> > mode,
> > we might as well take your v2 of your patch in addition to this
> > series.
> > This should hopefully make the caps lock LED happy and at least enable
> > the mouse collection. If someone wants to debug why the device doesn't
> > want to switch to mt, I'd be happy to help/review patches, but I think
> > we might as well take the easiest path :)
> > 
> > So Andy, if you still have the energy for this:
> > please apply this series and yours
> > (https://patchwork.kernel.org/patch/9069371/)
> > 
> > And report if this is sufficient enough.
> 
> Attached dmesg and hid-recorder files. Doesn't work. In dmesg it
> complained on USB transfer at some point during boot.
> 

Could you please double check your tree? The error in the dmesg can't
happen if you applied https://patchwork.kernel.org/patch/9069371/ which
sets the quirk HID_QUIRK_NO_INIT_REPORTS.

In usbhid_start(), we check for this quirk before entering the only
function that contains the error "timeout initializing reports\n".
(hiddev has an ioctl that can call it, but I assume you don't have any
userspace tool calling it, that would be insane).

So, your tree should have:
- latest Jiri's for-next branch (I usually merge it with the latest
  official rc)
- https://patchwork.kernel.org/patch/9081731/
- https://patchwork.kernel.org/patch/9081761/
- https://patchwork.kernel.org/patch/9069371/

Cheers,
Benjamin