Add your module to /etc/modules

 # /etc/modules: kernel modules to load at boot time.
 #
 # This file contains the names of kernel modules
 # that should be loaded at boot time, one per line.
 # Lines beginning with "#" are ignored.
 saa7134

Add options saa7134 card=42 at the end of /etc/modprobe.d/options

 # Enable double-buffering so gstreamer et. al. work
 options quickcam compatible=2
 # Default hostap to managed mode
 options hostap_pci iw_mode=2
 options hostap_cs iw_mode=2
 # Stop auto-association.
 # LP: #264104
 options ipw2200 associate=0
 # XXX: Ignore HPA by default. Needs to be revisted in jaunty
 options libata ignore_hpa=1
 options saa7134 card=42