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Writing driver for USB PC camera

Title: getReport() returns kIOReturnUnsupported
Dear all,
 
I am preparing to write a driver for a USB camera. It is just a normal USB camera for chatting on PC. It uses ISO transferring for video.
 
Because I am a new one for Mac OS X. I am not sure whether I should write a driver inside the kernel mode, or, just put it into user space. My target is to write a driver and let common applications like HackTV and so on to work with the driver. Is it possible?
 
And now, on my opinion, two components are needed, one is driver inside kernel or user space, the other is the QT component(digitizer). Is it correct?
 
Thanks
 
VL
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References: 
 >getReport() returns kIOReturnUnsupported (From: "Jake Laigo" <email@hidden>)



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