About LKM and COM's devices from Russia

[Belkin]

Hello! I'm a programmer from Russia. Where can I find documentation 
about LKM drivers or about next thing: I need to write driver of special 
device attached to com-port. I don't know how can I work with com-port 
(using termios.h or assembler?), because I don't know what is correct 
for kernel mode. I'm using C language, English and Russian...
I'll be happy if YOU help me.

P.S. Sorry for my English...