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

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Date:	Wed, 3 Nov 2010 16:37:14 -0500
From:	"Arce, Abraham" <x0066660@...com>
To:	Greg KH <greg@...ah.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.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" <linux-input@...r.kernel.org>
Subject: RE: [PATCHv1] staging: Synaptics RMI4 touchpad driver support

Hi Naveen,

> From: linux-input-owner@...r.kernel.org [mailto:linux-input-
> owner@...r.kernel.org] On Behalf Of Greg KH
> Sent: Wednesday, November 03, 2010 1:20 PM
> To: Dmitry Torokhov
> Cc: Linus Walleij; Naveen Kumar GADDIPATI; linux-kernel@...r.kernel.org;
> STEricsson_nomadik_linux; linux-input@...r.kernel.org
> Subject: Re: [PATCHv1] staging: Synaptics RMI4 touchpad driver support
> 
> On Wed, Nov 03, 2010 at 12:07:52PM -0700, Dmitry Torokhov wrote:
> > 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.
> 
> Great, thanks for this.
> 
> > Basically staging is yours, you can add whatever you want to it ;)
> 
> Heh, well, I try to at least cooperate with the different subsystem
> maintainers.  I don't need even more people pissed-off at me than I
> normally get :)
> 
> I'll queue this up for .38.
> 

I have done some initial testing with this patch, it includes some modifications to the board file, I have a gpio acting as irq plus driver code itself

I won't be able to get events (board will hang) unless adding the following code, is this due to the usage of a gpio as interrupt? If you could please clarify...

@@ -481,6 +483,9 @@ static int synaptics_rmi4_sensor_report(struct synaptics_rmi4_data *pdata)
                                                                        rfi);
                }
        }
+
+       enable_irq(gpio_to_irq(pdata->irq_number));
+
        /* return the number of touch points */
        return touch;
 }
@@ -498,6 +503,8 @@ static irqreturn_t synaptics_rmi4_irq(int irq, void *data)
        struct synaptics_rmi4_data *pdata = data;
        int touch_count;
        do {
+               disable_irq_nosync(gpio_to_irq(pdata->irq_number));
+
                touch_count = synaptics_rmi4_sensor_report(pdata);
                if (touch_count)
                        wait_event_timeout(pdata->wait, pdata->touch_stopped,

Best Regards
Abraham

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