pvr2_ctrl_get_min
int pvr2_ctrl_get_min(struct pvr2_ctrl *);
val = pvr2_ctrl_get_min(cip->cptr);
lmin = pvr2_ctrl_get_min(hcp);
lmin = pvr2_ctrl_get_min(vcp);
vc->minimum = pvr2_ctrl_get_min(cptr);