how is a device detected

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Hi, in  some of the books I am reading I find
a text which mentions MODULE_DEVICE_TABLE () macro makes a user
defined structure available  in the module image so that the module
can be loaded on demand if the card is hotplugged.
I am not clear with how is this detection happening inside the kernel.
How does the kernel detects the presence of a particular device?( I am
not referring to the probe function defined in many drivers)



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Most of the free documentation and device driver books are not worth reading.

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