USB Smart card reader/writer problem

[Vladimir Terziev]

On Thu, 6 Mar 2008 18:07:44 +0100
Hans Petter Selasky <hselasky at c2i.net> wrote:

> On Thursday 06 March 2008, Vladimir Terziev wrote:
> > 	Hi,
> >
> > 	i have ACS ACR38T Smart card reader/write device (idVendor=0x072f,
> > idProduct=0x90cc), which is an USB stick. I try to make it to work under
> > FreeBSD (trys have been done on 5.4, 5.5 and 6.2).
> >
> > 	The device has 3 endpoints -- interrupt-in, configured as /dev/ugenX.1 and
> > bulk-in/bulk-out, configured as /dev/ugenX.2.
> >
> > 	Neither the driver from openct-0.6.14 port nor the driver from ccid-1.3.5
> > port work for the device.
> >
> > 	The communication with the device gets stuck on BULK-OUT operations.
> > write(2) calls to /dev/ugenX.2 hang forever despite the timeout set with
> > USB_SET_TIMEOUT.
> >
> > 	The device has been tested to work under Windoze, so as general, it's not
> > broken, but just irresponsive.
> >
> > 	Could someone give me some clues about the nature of the problem ?
> >
> > 	Thanks in advance!
> >
> > 		Vladimir
> 
> Hi,
> 
> Some USB devices have problems with Clear Stall. FreeBSD usually clears the 
> stall on the endpoints before starting to use them. Some devices empty the 
> fifo when receiving this clear stall, and does not requeue the data. That is 
> why your device most likely does not work.
> 
> --HPS

Is there something i could do in order to workaround such a behaviour ?

	Vladimir