Hi Alan, Thanks for your reply. It really helps. What approach one should use to learn the device drivers? Vishal N On Thu, Jun 21, 2012 at 8:10 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
