Kernel API list for PCI based device driver

Hi,

I am new bee to ldd;
can some one link me /send me api list for pci based device driver.. Ethernet card/graphic card...
it's not very well documented.

or

let me know any workaround...

You are not being particularly clear on what your problem may be. Please be more specific and descriptive as to what you are trying to do, what you have done so far to accomplish that, etc.

i am learning ldd.
and learning it via programming Realtek RTL8139D ethernet card.
i am facing some problems while programming, specially about the usage of api's...
lot of text use different functions and approach to perform single task..which is bit confusing to me....
.
and documentation of these api calls are very visible on internet....
.
i guess it's all about your experiment and learn...
.
so,
i need some api reference book or material...