linux-kernel - Re: [PATCHv1] staging: Synaptics RMI4 touchpad driver support

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Date:	Wed, 3 Nov 2010 12:07:52 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Naveen Kumar GADDIPATI <naveen.gaddipati@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	STEricsson_nomadik_linux <STEricsson_nomadik_linux@...t.st.com>,
	linux-input@...r.kernel.org
Subject: Re: [PATCHv1] staging: Synaptics RMI4 touchpad driver support

On Wed, Nov 03, 2010 at 11:10:58AM -0700, Greg KH wrote:
> On Tue, Nov 02, 2010 at 08:40:30AM -0700, Dmitry Torokhov wrote:
> > On Tue, Nov 02, 2010 at 03:14:48PM +0100, Linus Walleij wrote:
> > > Greg KH wrote:
> > > 
> > > >> +Wait for the official upstream synaptics rmi4 clearpad drivers as promised over the past few months
> > > >> +Merge any device support needed from this driver into it
> > > >> +Delete this driver
> > > > 
> > > > Huh?
> > > > 
> > > > Why not just add this driver to the kernel tree instead?  When the
> > > > "promised" driver then eventually shows up (who is promising it?) then
> > > > delete the thing.
> > 
> > The same reason as there were several wireless drivers in staging?
> 
> Ok, that's a good enough reason for me :)
> 
> > > Well, Alan (on behalf of Ramesh Agarwal) sent out a very similar
> > > patch (Titled "Synaptics TM1217 Touchscreen Controller driver")
> > > the other day, and OTOMH that was after discussions with Synaptics
> > > where they said they were working on a "real" driver (a rather
> > > complex RMI4 bus driver) and we believe they will fix that sooner
> > > or later.
> > > 
> > > So, until sooner or later happens we thought we'd keep it in staging.
> > > 
> > > If you prefer both Alan and we can probably submit our patches for
> > > inclusion in the proper place.
> > > 
> > > A side effect may be that the Synaptics RMI4 people may have trouble
> > > to merge their driver into input/ since they may be requested to
> > > refactor the existing drivers to use it rather than merging new stuff,
> > > putting some burden on their shoulders.
> > > 
> > 
> > No, they have not been requested to change any existing [in tree]
> > drivers. They however been asked to convert to the driver core
> > primitives instead of rolling their own infprastructure to implement
> > devices and drivers binding.
> 
> If you don't object to this driver going in, and there is a path forward
> in the future for it to be able to be removed, then I will be glad to
> add it.
> 
> Can I add your Acked-by: to the patch for this?
> 

Umm... I haven't looked in detail, but I think it is sane enough for
staging... Much better than Alan's version that seemed to create a
separate input device for every finger. Needs to depend on INPUT and
probably regulators framework...  Probe function may call
input_free_device() after calling input_register_device() which is not
good.

Basically staging is yours, you can add whatever you want to it ;)

-- 
Dmitry
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