On Wed, 2011-06-08 at 17:45 +0300, Martin Paljak wrote:
> Hello,
> 
> 
> On Wed, Jun 8, 2011 at 17:37, Andre Zepezauer
> <andre.zepeza...@student.uni-halle.de> wrote:
> >> More elegant indeed. Some nice documentation about the real meaning of the 
> >> flag would also be nice. "most cards do almost ISO" to support pinpads.
> >> But not all support the status query...
> >
> > Maybe I'm wrong, but IMO Viktor had implemented the status query through
> > empty data field some time ago. So, there would be at least two cards
> > which does support it.
> 
> 
> 
> There was discussion about it a few months ago, probably at the same
> time. The general consensus (also my personal opinion) seemed to be
> that it is safer not to probe the card, as there are several cards
> that don't support the convention and some even decrease the retry
> counter (like the buggy new ID-card in Estonia...)
> 
> Even though many cards override pin_cmd, extra care should be taken to
> not accidentally block a PIN code, thus the feature (like a flag)
> should be set case-by-case.

Would it be safe enough to set a specific flag in the drivers init
function? And if set, then the status query could be performed without
casing harm.

Open questions:
* is it worth to make that effort
* how many cards do have support for that feature

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