Missing main function

[Niamathullah sharief]

Hi friends,
   I am having the video drivers..ie "gspca.c, v4l1.compat.c, v4l2-device.c,
v4l2-ioctl.c,v4l2-dev.c".
   When i tried to read all this programs but i didn't find main function in
any programs.
   I don't know how this programs works. From where is the main function for
this programs.
   I took this drivers from Version 2.6.30 kernel. Kindly help me.