On Thursday 13 August 2015 18:25:16 Vadim Klishko wrote: > > On Thu, Aug 13, 2015 at 06:11:22PM -0600, Vadim Klishko wrote: > >> I am not sure I understand what details you are looking for, but as > >> far as I know, the only way a command sent to an Alps device from the > >> host could reach the trackstick is when the touchpad chip is in > >> pass-thru mode. > > > > We are looking for information on how to detect whether a device > > supports pass-through mode and how to activate it. IOW we are looking > > for the protocol specs for the PS/2 flavor used by ALPS devices. So far > > we had to deduce many of the details itself and it would be great if > > manufacturer would share the information with us sol that we could > > improve support for the devices in Linux kernel. > > > OK, got it. It may take some time. > Hi Vadim! Now after more months, do you have some news about this? > > >> > >> > >> ----- Original Message ----- > >> From: "Dmitry Torokhov" <dmitry.torokhov@xxxxxxxxx> > >> To: "Pali Rohár" <pali.rohar@xxxxxxxxx> > >> Cc: "Ari Entlich" <atrigent@xxxxxxxxx>; <linux-input@xxxxxxxxxxxxxxx>; "Masaki Ota" <012nexus@xxxxxxxxx>; "Tommy Will" <tommywill2011@xxxxxxxxx>; "Yunkang Tang" <yunkang.tang@xxxxxxxxxxx>; "Qiting Chen" <qiting.chen@xxxxxxxxxxx>; "Qiting Chen" <elaineee66@xxxxxxxxx>; <vadim@xxxxxxxxxx> > >> Sent: Thursday, August 13, 2015 4:48 PM > >> Subject: Re: ALPS v7 trackpad passthrough to Thinkpad trackpoint > >> > >> > >> > On Thu, Aug 13, 2015 at 01:03:17PM +0200, Pali Rohár wrote: > >> >> On Friday 07 August 2015 12:35:33 Ari Entlich wrote: > >> >> > On Fri, Aug 7, 2015 at 10:12 AM, Pali Rohár <pali.rohar@xxxxxxxxx> wrote: > >> >> > > For some old ALPS devices which use V1 and V2 protocols (with flag > >> >> > > ALPS_PASS) there is something like that. On that devices touchpad is > >> >> > > behind trackpoint HW. But you cannot wait for data or poll for both > >> >> > > devices at same time -- you need to choose if tou want to talk directly > >> >> > > to touchpad (via passthrough mode) or just to trackpoint. I think > >> >> > > because of this limitation ALPS driver implement all logic in one > >> >> > > driver... > >> >> > > > >> >> > > Above was for old ALPS devices. New ALPS devices with V3 or V5 protocols > >> >> > > have trackpoint behind touchpad, so normally OS communicate with > >> >> > > touchpad (and not with trackstick like before). But here touchpad sends > >> >> > > data for both touchpad and trackstick events and so OS does not have > >> >> > > normal access to "hidden" trackstick. > >> >> > > > >> >> > > There is a way "jump" into passthrough mode and talk directly to > >> >> > > trackpoint. But it is used only for configuring trackstick and currently > >> >> > > it is used to configure trackstick so it send data (via touchpad) in > >> >> > > format which is supported by our ALPS driver. > >> >> > > > >> >> > > On the other hand, synaptics driver and devices support full > >> >> > > "encapsulation" or how can I call it of serio PS/2 device and in this > >> >> > > case you can use full set of PS/2 commands directly with trackstick > >> >> > > (behind synaptics touchpad). ALPS devices do not support something like > >> >> > > that. > >> >> > > >> >> > It looks to me like the Synaptics passthrough is implemented primarily > >> >> > via the ability to write directly to the trackpoint. Events coming > >> >> > from the trackpoint are implemented similarly to the ALPS driver - by > >> >> > redirecting trackpoint events to the second device which the driver > >> >> > creates for the trackpoint. > >> >> > > >> >> > >> >> No, passthrough for ALPS and Synaptics differ. Synaptics driver exports > >> >> full serio PS/2 bus on which can be attached psmouse.ko driver with full > >> >> mouse detection (or any other serio driver) and so there can be full > >> >> TPPS/2 trackpoint.c protocol driver. > >> >> > >> >> ALPS allows us for *some* protocol version passthrough data directly to > >> >> touchpad (or trackpoint) device. There is no support to exporting full > >> >> serio bus with PS/2 access to it (like for Synaptics hardware). > >> > > >> > At least we do not know how to detect and activate it even if it exists. > >> > > >> > Let's add some ALPS people to the thread: maybe they could share some > >> > details on accessing trackpoints behind the touchpads with us. > >> > > >> > Thanks. > >> > > >> > -- > >> > Dmitry > >> > >> -- > >> This message and any attachment are confidential. It may also be privileged > >> or otherwise protected by work product immunity or other legal rules. If > >> you have received it by mistake, please let us know by e-mail reply and > >> delete it from your system, you may not copy this message or disclose its > >> contents to anyone. > >> Cirque Corporation > > > > -- > > Dmitry > -- Pali Rohár pali.rohar@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
