I'm designing a custom high throughput, tightly timed USB system (read: the libusb library is not really an option).

I've already written a kernel USB device driver which interfaces to the USB core driver. When the device is plugged in, it correctly identifies and connects to the driver.

What I need now is to use the driver's functionality from user space. Ideally, I want to develop an application that can perform a few different individual routines, based on user input. How can I make this interface between kernel and user space happen?

I'm reading a char interface would be the best option, but how do I tie in the char interface with the USB device driver? The documentation on connecting a USB driver to user space is a little sparse. Are there any good examples of this? Any thoughts or input would be much appreciated!

-D

Here is a tutorial describing how to write a driver completely in user space. www.linuxjournal.com/article/7466

I'm not sure exactly how to use kernel drivers in user space (I'm just starting to look at things like that) but maybe the above could be helpful.

unfortunately, I don't think libusb will work for me, which is what is documented in the article. I really need asynchronous usb.

However, using the usbfs Device files looks promising. Has anyone used these before, or know of any decent documentation?