Re: Synaptics Multi touch capabilities

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Dec 27, 2009, at 8:43 AM, Erik Andrén <erik.andren@gmail.com> wrote:

> 2009/12/27 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
>> On Fri, Dec 25, 2009 at 12:54:16PM +0100, Erik Andrén wrote:
>>> 2009/12/25 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
>>>> On Thu, Dec 24, 2009 at 11:54:27AM +0100, Erik Andrén wrote:
>>>>> 2009/12/23 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
>>>>>> On Wednesday 23 December 2009 03:13:04 am Erik Andrén wrote:
>>>>>>> Hi,
>>>>>>> I have a ASUS 1005HA netbook equipped with a Synaptics touch  
>>>>>>> pad:
>>>>>>> [   18.341491] Synaptics Touchpad, model: 1, fw: 7.2, id:  
>>>>>>> 0x1a0b1,
>>>>>>> caps: 0xd04731/0xa40000
>>>>>>>
>>>>>>> In Linux, no multitouch capabilities are detected (Zoom, two  
>>>>>>> and three
>>>>>>> finger button presses etc.).
>>>>>>> This all works with the same hardware in windows 7.
>>>>>>> Is there a bug in the linux driver preventing multitouch to  
>>>>>>> work?
>>>>>>>
>>>>>>
>>>>>> Linux Synaptics driver does not have full multitouch support  
>>>>>> (yet?). The 2-
>>>>>> and 3- finger taps should work (provided that they are enabled  
>>>>>> in SYnaptics X
>>>>>> driver) but there is no multiple finger tracking...
>>>>> They don't. I've tried with the 1.1.2 and 1.2.0 version of the  
>>>>> xorg
>>>>> synaptics driver. But if this is the issue I guess I should take  
>>>>> this
>>>>> inquiry to the proper xorg mailing list.
>>>>
>>>> Not yet, kernel needs to add support for this as well.
>>>>
>>>>>
>>>>>>
>>>>>> BTW, the capability 0xd04731 indicates that your hardware does  
>>>>>> not report
>>>>>> multi-finger taps.
>>>>>>
>>>>> I'm aware of that, but why does pinch and zoom then work in  
>>>>> windows 7?
>>>>> Is it possible to emulate this with a single touch touchpad?
>>>>>
>>>>
>>>> I think your touchpad is a fully multi-finger one, not just multi- 
>>>> finger
>>>> tapping like older touchpads. Only multi-finger tapping is  
>>>> currently
>>>> supported by Synaptcs X driver.
>>>>
>>> Could you elaborate on what a multi-finger touchpad is?
>>
>> Multi-finger touchpad (or touchscreen) is a device that can recognize
>> several objects touching the surface of the device and report  
>> separate
>> sets of coordinates (and maybe more data) for every object.
>>
>>> The Synaptics PS/2 Touchpad Interface Guide, 3.2.6 states that two  
>>> and
>>> three fingers are only detected when the capMultiFinger capability  
>>> is
>>> detected which according to the driver isn't detected for this
>>> touchpad.
>>>
>>
>> Apparently this guide is a bit obsolete.
>>
>
> I've downloaded the document from the synaptics website and it has a
> 2009 copyright which means its fairly recent.

As witnessed by the presence of ClickPads that are not documented  
there it is not complete.

> Are you sure there are any other documentation? If so, do you have any
> access to it? Or is this some kind of proprietary interface?

>
No, I do not.

-- 
Dmitry

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