SDIO Drivers?

Hi,
   i want to write an SDIO driver. There is not much information of
what an SDIO driver is
   supposed to do or any sample sdio drivers.

   I have a few questions regarding that:

   1) What is an SDIO Driver?.

   2) Is SDIO a protocol/standard to which all devices confirm?.

   3)  Is it a generic driver ?. (Same for a set of devices) or
different for each device?
        Suppose i want to run an SDIO WLAN Card?. will the
manufacturer support it or
       an will a Generic Driver "drive" it?

   4) What is a SD Driver?

   5) What are the differences between SD Driver and SDIO Driver?.


   6) Are there any sample/Open Source SDIO drivers available in Linux
Kernel or else where?.If, not when can one expect/is anyone working on
it currently?.


  Please CC your responses to  vshrirama-at-gmail.com

Thanks and Regards,
sriram
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