USB Storage Device Driver

netwizio · 12-01-2007, 05:49 PM

Hello

I am trying to write a custom driver for my USB storage device so that all the data on the disk can be encrypted while writing.

My module's installation etc goes fine but my probe function is not able to detect the device. I am giving the right vendor id and product id.

The default usb-storage driver (usb-storage.ko) is also present.
Do I have to remove it ? Or there can be two drivers which can receive notification for usb device plugging in etc ?

I would appreciate any help on this issue

Thanks

gnashley · 12-02-2007, 11:39 AM

I would suspect that the standard driver is intercepting the event notification. Try removing the regular module and see if yours works then.

netwizio · 12-02-2007, 03:52 PM

I removed the usb-storage module but after that as soon as I insert my flash disk the kernel panics. I suspect that the usb core still thinks that the usb storage device driver is present and attempt to call it results in oops.

gnashley · 12-03-2007, 01:41 AM

Sounds like your module needs to have extra functionality which is normally supplied by the regular usb-storgae module. You would either need to add this functionality or write it in such a way that it can co-exist with the regular module. Or maybe the usbcore module is being unloaded when you unload usb-storage.
Maybe it would be better to let the regular usb drivers handle the core functionality and setup a udev rule which runs your program when the right kind of device is detected.