On Thu, 21 Jun 2012, Vishal Nandanwar wrote: > 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. That's a terrible way to learn. The mass-storage driver is one of the most complicated ones in the USB subsystem. You should start with something simpler. > 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. Yes. Those sub-drivers are needed because their devices don't use the standard USB mass-storage protocol. > 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? I can tell you in one word how to write a driver for your pen drive: Don't! If you don't write a special driver then the pen drive should work perfectly well. If you did try to write a special interface sub-driver for it, you'd find that your driver had nothing to do because usb-storage already handles everything. Alan Stern -- 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
