Hi Borris, Thank you very much for the Bugzilla pointer, I upgraded my hiddev driver to the 2.4.30 version, and commented out the code as indicated in Bug 1048, this has now fixed the problem. Regards, Clive
At 21:56 20/04/2005 -0400, Boris Shingarov wrote:
Clive,
I can't really be absolutely sure about this, but I think it is the same situation as described in Bug 1048 in the Kernel Bugzilla (http://bugzilla.kernel.org/show_bug.cgi?id=1048). There are two lines in hidcore.c which specifically "cache" the reported value and discard the report if the value is the same as the previous one. This bug has caused great grief for us with our KTI and RBI "hard-token initializers" (devices used to burn encryption keys into two-factor authentication tokens).
The bug page in Bugzilla describes the two lines of code that you need to remove from hidcore.h to fix it. Also, I have recently posted the patch to linux-usb-devel.
Please do let me know if what you see is in fact caused by this "feature".
Boris
Clive Levinson wrote:
Hi,
I am trying to interface a magnetic card reader via hiddev on kernel 2.4.21.
After a bit of experimentation, I am now able to get reports when the card is
swiped. I use select to wait for valid data, before performing a read.
My problem is, that I don't receive notifications when the *same* card is swiped
a second time, obviously the report hasn't changed, as the data is the same,
but I need to know that a card has been swiped.
How can I either flush a report, so that I get I new report when the card is swiped,
or somehow receive notification. The hiddev.txt documentation mentions a
HIDDEV_FLAG_REPORT, that would seem to solve the problem, however this
does not actually exist in the hiddev driver source code.
Thanks,
Clive
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