things to be kept in mind while doing "Character Driver"
1>Be very patient as you will get different errors with silly solutions.
2>As
you are dealing with multiple files like in my case files are
header.h,declaration.h,init.c,clean.c,fops.h,prototypes.h,devopen.c,
devrelease.c,devwrite.c...BE CAREFUL about the handling the variables used in these files....
3> Using EXTERN command ,,, just keep a single logic where to declare extern and how to use it.
4>sometimes the TEST script can make a issue...so also update your script acc. to programs.
5>Don't
used any variable or pointer which has no use.although there would be
warning no error...but it will create problems in inserting the driver.
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