Kindly guide me to write a USB host driver..

any online documentation/tutorials for Linux Host controller driver?.

I would not even bother trying to do this via a web tutorial, but YMMV. Try google. Unfortunately, for some reason the GNU on-line documentation for the kernel (http://www.gnugeneration.com/books/l...20/kernel-api/) does not include any of the numerous usb_ functions!

However, there are at least 2-3 books in print on linux device drivers. Which I guarantee that this is going to take you some time, so you might as well dish for a book.

Not sure why you would want to do this either, since the host controller driver is already there.

Thanks. But I need to debug a host driver that is already supplied by the vendor and I want to have idea of the host driver execution flow.

I have searched google / books, but I found the lot of docs for USB device driver writing only. Thats why I seek the help from linux community.

If you mean the linux USB host driver (singular, since there is only one of each flavour), that is part of the official kernel source and you should contact the official maintainers named in the code.

If you are using something else I think you are gonna have a tough time; the documentation for (linux specific) USB driver programming is not even that extensive, beyond a few books, and the books I have do not bother with the host controller since it already exists. However, there is much interaction with the host controller, so depending on how extensive this debugging task is, you may need to get a grasp on that first.

Hello,

I have to develop an USB host..could you please guide me how to proceed..

thanks
SAI