Basic question about device driver

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hi,
i know unix fairly well and good at C, but new to the linux environment. I'm studying device driver development(kernel space). i'm refering the linux device driver book by allessandro rubini.  which is quite good... but still i'm having some problems in thoroghly understanding the basic concepts!

someone pls answer this: how exactly a device address comes to the driver? ( which will be used by copy-to-user/copy-from-user) 

Thanks,
Dhanshri





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