Date: Mon, 10 Mar 2008 17:48:48 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Vladimir Terziev <vlady@gbservices.biz> Cc: freebsd-usb@freebsd.org Subject: Re: USB Smart card reader/writer problem Message-ID: <200803101748.48646.hselasky@c2i.net> In-Reply-To: <20080310094302.dce54954.vlady@gbservices.biz> References: <20080306183641.c941b83a.vlady@gbservices.biz> <200803071855.47520.hselasky@c2i.net> <20080310094302.dce54954.vlady@gbservices.biz>
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On Monday 10 March 2008, Vladimir Terziev wrote: > Hi, > > thanks, but i thought there is some userland-based solution ... > > If i remove the "clear stall" command from the kernel, how will this > affect the other USB devices ? Is there a guarantee they will continue to > function as normal ? You might loose an USB packet if the Data-toggle is wrong. --HPS > > Vladimir > > > On Fri, 7 Mar 2008 18:55:46 +0100 > > Hans Petter Selasky <hselasky@c2i.net> wrote: > > Hi, > > > > You could search in /sys/dev/usb for xxx_pipe_open() or something like > > that, and remove the clear stall command from that function and the > > recompile your kernel and modules. > > > > --HPS > > > > On Friday 07 March 2008, Vladimir Terziev wrote: > > > On Thu, 6 Mar 2008 18:07:44 +0100 > > > > > > Hans Petter Selasky <hselasky@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
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