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From: Marge Yang <Marge.Yang@tw.synaptics.com>
To: "friederhannenheim@riseup.net" <friederhannenheim@riseup.net>, Dmitry
 Torokhov <dmitry.torokhov@gmail.com>, Scott Lin <scott.lin@tw.synaptics.com>
CC: "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Vincent Huang
	<Vincent.huang@tw.synaptics.com>
Subject: RE: [PATCH] input/touchscreen: synaptics_tcm_oncell: add driver
Thread-Topic: [PATCH] input/touchscreen: synaptics_tcm_oncell: add driver
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Date: Mon, 1 Apr 2024 06:18:46 +0000
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Loop Scott Lin

Scott Lin is responsible for mobile products.

Thanks
Marge Yang


-----Original Message-----
From: friederhannenheim@riseup.net <friederhannenheim@riseup.net>=20
Sent: Sunday, March 31, 2024 4:35 AM
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Marge Yang <Marge.Yang@tw.synaptics.com>; linux-input@vger.kernel.org; =
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] input/touchscreen: synaptics_tcm_oncell: add driver

CAUTION: Email originated externally, do not click links or open attachment=
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On 2024-03-28 18:53, Dmitry Torokhov wrote:
> [ now CCing for real ]
>
> Hi Frieder,
>
> On Wed, Mar 27, 2024 at 10:39:12PM +0100, Frieder Hannenheim wrote:
>> This is a bit of a stripped down and partially reworked driver for=20
>> the synaptics_tcm_oncell touchscreen. I based my work off the driver=20
>> in the LineageOS kernel found at=20
>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__github.com_Linea
>> geOS_android-5Fkernel-5Foneplus-5Fsm8250&d=3DDwICAg&c=3D7dfBJ8cXbWjhc0Bh=
I
>> mu8wVIoUFmBzj1s88r8EGyM0UY&r=3Dddk_91asmhyAjxFmXHNIQZ2mVcW0D_eq4tb4409nZ=
94&m=3D2_iuhvyQkYcT-qsozPf_h9irH_AlUtaQ020UAxVQhZ3SuHgXYihgVocHyTV-zNSV&s=
=3DFT4Hkpxkhqktmhyz4RWC9lGAD4DvNBS06wQnn4ofQkk&e=3D  branch lineage-20. The=
 code was originally written by OnePlus developers but I'm not sure how to =
credit them correctly.
>
> So the first question is: does this device not use Synaptics RMI4=20
> protocol?
>
> I am CCing Marge Yang of Synaptics who may shed some light on the kind=20
> of touch controller this is.
>
> Thanks.
Hi Dmitri,

the synaptics-s3908 uses a command based protocol whereas rmi4 is register-=
based (as far as I understand it, I haven't been able to read up on it prop=
erly since information on the internet is sparse). So I'm pretty sure that =
it can not be controlled via rmi4.

Best wishes,
Frieder