Loop Scott Lin Scott Lin is responsible for mobile products. Thanks Marge Yang -----Original Message----- From: friederhannenheim@xxxxxxxxxx <friederhannenheim@xxxxxxxxxx> Sent: Sunday, March 31, 2024 4:35 AM To: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Cc: Marge Yang <Marge.Yang@xxxxxxxxxxxxxxxx>; linux-input@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx Subject: Re: [PATCH] input/touchscreen: synaptics_tcm_oncell: add driver CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe. 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 >> the synaptics_tcm_oncell touchscreen. I based my work off the driver >> in the LineageOS kernel found at >> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_Linea >> geOS_android-5Fkernel-5Foneplus-5Fsm8250&d=DwICAg&c=7dfBJ8cXbWjhc0BhI >> mu8wVIoUFmBzj1s88r8EGyM0UY&r=ddk_91asmhyAjxFmXHNIQZ2mVcW0D_eq4tb4409nZ94&m=2_iuhvyQkYcT-qsozPf_h9irH_AlUtaQ020UAxVQhZ3SuHgXYihgVocHyTV-zNSV&s=FT4Hkpxkhqktmhyz4RWC9lGAD4DvNBS06wQnn4ofQkk&e= 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 > protocol? > > I am CCing Marge Yang of Synaptics who may shed some light on the kind > 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 properly since information on the internet is sparse). So I'm pretty sure that it can not be controlled via rmi4. Best wishes, Frieder
