where can I get the changes of PCMCIA between kernel 2.4 and 2.6?

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hi, *

I am porting a pcmcia device driver from kernel 2.4 to kernel 2.6. And
I find that the header files of pcmcia in linux are different between
2.4 and 2.6. For example, in kernel 2.4, the definition of dev_link_t
includes "struct timer_list   release", but none in kerne 2.6. Another
case in point is that there is bus_ops.h header file in kernel 2.4 but
it disappears in kernel 2.6.

I want to know how to port a pcmcia device driver from kernel 2.4 to
2.6. First of all, I should know the changes between these two
kernels. I have read the README accompany with pcmcia-cs-3.2.8 in
http://pcmcia-cs.sourceforge.net/. But I find nothing useful for me.
And I have searched using google, but I can't locate the useful
information. So I turn for help in here.

Are the header files different between kernel pcmcia subsystem and
standalone pcmcia?

Thank you with best regards,
TowerGee