Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev2)

[Rafi Rubin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 05/19/10 20:51, Ping Cheng wrote:
> On Wed, May 19, 2010 at 5:26 PM, Rafi Rubin <rafi@xxxxxxxxxxxxxx> wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> On 05/19/10 20:13, Ping Cheng wrote:
>>> On Wed, May 19, 2010 at 4:34 PM, Rafi Rubin <rafi@xxxxxxxxxxxxxx> wrote:
>>>> My understanding is that it would be more like
>>>> +   SYN_MT_SLOT 0
>>>> +   ABS_MT_POSITION_X x
>>>> +   ABS_MT_POSITION_Y y
>>>> +   SYN_REPORT
>>>> +   SYN_MT_SLOT 0
>>>> +   ABS_MT_POSITION_X x
>>>> +   ABS_MT_POSITION_Y y
>>>> +   SYN_REPORT
>>>> +   SYN_MT_SLOT 0
>>>> +   ABS_MT_POSITION_X x
>>>> +   ABS_MT_POSITION_Y y
>>>> +   SYN_MT_SLOT 1
>>>> +   ABS_MT_POSITION_X x
>>>> +   ABS_MT_POSITION_Y y
>>>> +   SYN_REPORT
>>>
>>> You are right if one slot only has or is only allowed to have one
>>> point. My scenario is that one slot can have more than one point.
>>> Basically, my intention is to utilize the MT_SLOT and MT_TRACKING_ID
>>> in such a way that it avoids as much overlap as possible.
>>>
>>> And hopefully it makes sesne in the reality too.
>>
>> Please clarify by what you mean by more than one point.
> 
> I might have been confused myself by ABS_MT_BLOB_ID and SYN_MT_SLOT
> here.  What I meant by "more than one point" is a contact (or touch, I
> am not sure which one is the right term :) is represented by a few
> (x,y) coordinates. Maybe we should use SYN_MT_SLOT for my case?
> 
>> I may be misunderstanding, but I thought that these slots are basically a
>> superior replacement to tracking id.
>>
>> one finger -> one slot
> 
> This is what I needed to understand. Is slot for one (x,y) only or can
> it also be used for more than one set of (x,y)?
> 
>> But with slots we can use the filtering that input provides, which we've been
>> by-passing with the existing MT protocol (at least that's what I think Henrik's
>> goal is).
> 
> Good to know that filtering has already been considered. I know I must
> be out of sync with Henrik's goal.  That's why I wanted to show my
> ignorance :).
> 
> Ping
> 

Hey, sometimes Mark Twain's old advice is good, and sometimes its not.

It's better to keep your mouth shut and be thought a fool than to open it and
leave no doubt. --Mark Twain


I think this is definitely a case where he's wrong.  We need to sync up so that
we're all implementing the same protocol, and can move on to the next
interesting problem.

Rafi
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkv0ik4ACgkQwuRiAT9o608XmQCdFiTOymC+OEVyQ+atbEdpCiDd
RRYAoIsNpOZpI0Yxr4BG1uEj7Fja2Fyo
=lK01
-----END PGP SIGNATURE-----
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/