linux-kernel - Re: [PATCH] Input: synaptics

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Date:	Tue, 9 Sep 2014 16:15:18 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Andrew Duggan <aduggan@...aptics.com>, linux-input@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics - add support for ForcePads

On Wed, Sep 10, 2014 at 01:07:02AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 09/10/2014 12:57 AM, Dmitry Torokhov wrote:
> > On Tue, Sep 09, 2014 at 03:07:21PM -0700, Andrew Duggan wrote:
> >> On 09/09/2014 10:06 AM, Dmitry Torokhov wrote:
> >>> On Tue, Sep 09, 2014 at 09:44:17AM +0200, Hans de Goede wrote:
> >>>> Hi,
> >>>>
> >>>> On 09/08/2014 06:55 PM, Dmitry Torokhov wrote:
> >>>>> ForcePads are found on HP EliteBook 1040 laptops. They lack any kind of
> >>>>> physical buttons, instead they generate primary button click when user
> >>>>> presses somewhat hard on the surface of the touchpad. Unfortunately they
> >>>>> also report primary button click whenever there are 2 or more contacts
> >>>>> on the pad, messing up all multi-finger gestures (2-finger scrolling,
> >>>>> multi-finger tapping, etc). To cope with this behavior we introduce a
> >>>>> delay (currently 50 msecs) in reporting primary press in case more
> >>>>> contacts appear.
> >>>>>
> >>>>> For now we are using DMI matching to detect ForcePads, hopefully we'll
> >>>>> be able to figure a better way down the road.
> >>>> What about using the pnp-id, in my experience with the recent lenovo
> >>>> laptops that tends to be more reliable.
> >>> Not sure. So far I only know of HP 1040 having it. FWIW:
> >>>
> >>> dtor@...r-glaptop:~$ cat /sys/bus/pnp/drivers/i8042\ aux/00\:07/id
> >>> SYN300d
> >>> SYN0100
> >>> SYN0002
> >>> PNP0f13
> >>>
> >>> I think if we see generalities we can switch over later. I hope
> >>> Chris/Andrew will come with a capability bit though :)
> >>
> >> The ForcePad capabilities bit is 1 << 15.
> > 
> > Awesome, thanks!
> > 
> > Then I guess the patch below is what we'll be needing for these devices.
> 
> Yep, the patch looks good to me.

Thanks, I'll put you down as reviewed-by then.

-- 
Dmitry
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