Hi Andreas, Andreas Jellinghaus wrote: > Thinking about it for a few more minutes, I have a much better > advice: implement a serial port.
That was also an idea of Alax Cox. But this implies to emulate the whole reader in kernel land (the kernel driver must be the 'firmware' of this device). Than an application can work with this device like an externally connected one. But who wants such complex code in the kernel? > the reader-smart card interface is not that much different from > a serial port I guess, so in kernel land you should be able > to look at many existing drivers for serial ports, and implement > a simple serial port driver with some special hacks for the > smart card specific parts. Currently in my prototype I just use the standard IO functions like read() and write() to receive and send data from/to the SmartCard. Setting up communication parameter is done via special (=SmartCard related) IOCTLs (shown in the attached file in my first mail to this list). Should work in a way you suggest. > and in user land: there are full drivers for serial port > smart card readers, so you can simply re-use one of them > and adapt it to the specifics of your serial port / reader. Problem is, how to setup the SmartCard communication parameter via IOCTL? The currently implemented serial drivers changing these kind of parameters by sending special commands through the serial line to the reader's firmware (or its firmware does it by itself). They are only using IOCTLs to setup the serial line parameters between the host and the reader. To re-use it, I would need a command interpreter in the kernel driver to distinguish between commands to the firmware and to the SmartCard. Hmmm, I don't like this idea. I have a working openct driver for my device (and the "home brew" API between userland and kernel). Should I send it to this list for discussion? Regards, Juergen _______________________________________________ opensc-devel mailing list opensc-devel@lists.opensc-project.org http://www.opensc-project.org/mailman/listinfo/opensc-devel
