Re: Fwd: ALPS v7 TrackStick detected wrongly

[Martin <madstitz@gmail.com>]

So I can't be sure if it even detects the trackstick, because it just 
creates the device anyway?

I bought the trackpad from eBay, as Lenovo doesn't sell it separately.
Apparently its pure luck if you get a Synaptics or Alps model - I got 
the Alps, my friend got the Synaptics model.
Don't know whether Lenovo uses Alps in its newer series too or if this 
trackpad is a fake (feels and works very real though ;))

Maybe I'll try to get a synaptics then, as this was the manufacturer of 
the original trackpad.

Greetings
Martin


Am Do, 14. Jan, 2016 um 9:07 schrieb Pali Rohár <pali.rohar@gmail.com>:
> On Thursday 14 January 2016 13:04:43 Martin <madstitz@gmail.com> 
> wrote:
>>  Is your patch intended to solve this or should I open a bug ticket?
> 
> Hi! That my patch hides Track Stick input device when ALPS touchpad
> report that Track Stick is not present. Before my patch was applied
> kernel created "AlpsPS/2 ALPS DualPoint Stick" input device for V7
> protocol always, even if there was no Track Stick device.
> 
> But as Dmitry said, you replaced Synaptics touchpad with ALPS which is
> working differently. Synaptics touchpad export PS/2 bus via its own
> pass-though protocol and this bus then available on kernel which do
> normal PS/2 mouse detection it. So kernel bind thinkpad TPPS2 driver 
> to
> that bus.
> 
> ALPS is working differently. There is no pass-though mode and all data
> (touchpad, track stick) are exported in ALPS packets. Kernel ALPS 
> driver
> has special parser which can decide if packet comes from touchpad or
> trackstick (based on received data). So via ALPS touchpad kernel 
> cannot
> communicate directly with trackpoint.
> 
> So I guess... in case you have thinkpad trackpoint HW and ALPS 
> touchpad
> which cannot work with that trackpoint you just do not get trackpoint
> data. Here kernel cannot do anything.
> 
> I suspect that if you apply my patch (which check presence of
> trackstick) then kernel probably do not export this track stick device
> "AlpsPS/2 ALPS DualPoint Stick" anymore...
> 
>>  I: Bus=0011 Vendor=0002 Product=0008 Version=0700
>>  N: Name="AlpsPS/2 ALPS DualPoint Stick"
>>  P: Phys=isa0060/serio1/input1
>>  S: Sysfs=/devices/platform/i8042/serio1/input/input8
>>  U: Uniq=
>>  H: Handlers=mouse0 event6
>>  B: PROP=21
>>  B: EV=7
>>  B: KEY=70000 0 0 0 0
>>  B: REL=3
> 
> --
> Pali Rohár
> pali.rohar@gmail.com

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