Hi, I am trying to understand the USB device driver writing mechanism and architecture. I have gone through the LDD book as well. For learning purpose I am trying to write a driver for a pen drive i.e. USB mass storage. Linux do have the usb-storage driver which is used for pen drive. I have gone through the ../driver/usb/storage folder of Linux source code and found there are few drivers(karma, freecom) which uses usb-storage to achive there functionality. what is the mechanism to write a driver for pen drive(USB mass storage)? Is there any guide/help document which describes how to create a interface driver on top of usb-storage driver, so when my pen driver is connected it should use my driver? Vishal N -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html