linux-kernel - Re: [PATCH] Input: synaptics add manual min/max quirk

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Date:	Fri, 28 Mar 2014 16:25:30 -0400
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Christopher Heiny <cheiny@...aptics.com>,
	Andrew Duggan <aduggan@...aptics.com>,
	linux-input <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	Stephen Chandler Paul <thatslyude@...il.com>,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] Input: synaptics add manual min/max quirk

On Fri, Mar 28, 2014 at 12:09 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Fri, Mar 28, 2014 at 01:29:50AM -0700, Dmitry Torokhov wrote:
>> On Fri, Mar 07, 2014 at 10:49:24AM -0500, Benjamin Tissoires wrote:
>> > The new Lenovo Haswell series (-40's) contains a new Synaptics touchpad.
>> > However, these new Synaptics devices report bad axis ranges.
>> > Under Windows, it is not a problem because the Windows driver uses RMI4
>> > over SMBus to talk to the device. Under Linux, we are using the PS/2
>> > fallback interface and it occurs the reported ranges are wrong.
>> >
>> > Of course, it would be too easy to have only one range for the whole
>> > series, each touchpad seems to be calibrated in a different way.
>> >
>> > We can not use SMBus to get the actual range because I suspect the firmware
>> > will switch into the SMBus mode and stop talking through PS/2 (this is the
>> > case for hybrid HID over I2C / PS/2 Synaptics touchpads).
>> >
>> > So as a temporary solution (until RMI4 land into upstream), start a new
>> > list of quirks with the min/max manually set.
>> >
>> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>> > CC: stable@...r.kernel.org
>>
>>
>> Applied, thank you.
>
> That was giving compiler errors when configured without synaptics
> support so I had fiddle with the patch a bit. I'll take full
> responsibility for any breakage ;)
>

Thanks for fixing it. Tested and approved by myself, so no breakage to
report here :)

BTW, I have to send out also the min/max for the new X1 Carbon and the
Yoga (not the 2)... I am wondering how to make sure the kernel will
discriminate the Yoga from the Yoga 2 now :/

I'll come back as soon as I can.

Cheers,
Benjamin
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