Hello List! I am developing a driver for an external device that connects to my linux box via a serial port. I want to develop the driver as a kernel module so that I can minimize interrupt response latencies and achieve hard realtime device handling (I'm using the realtime-preempt kernel patch from Ingo Molnar & co.). Basically all I need to do in the driver is to send a command to the device via the serial port, then handle the response via an interrupt handler, immediately sending the query again, and then shove the parsed results from the queries out to userland, where a non-RT process will pick it up and shove it into a database. Can I interface with the existing Linux serial port driver somehow, or will I have to basically write my own serial port driver just to be able to communicate across one? Also, If I can interface with the serial port driver, would I do that through using the /dev/ttyS* character device file, or would that make the serial port communications go through userland? Is there a better way to interface with existing hardware drivers/devices from the kernel level? Thanks much for your time! -James -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
