* sets only some bits (specified by bitmask) of a register, by first reading
  * the actual value
  */
-int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
+static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
                                 u8 bitmask)
 {
        int oldval;
 
 }
 EXPORT_SYMBOL(em28xx_unregister_extension);
 
-struct video_device *em28xx_vdev_init(struct em28xx *dev,
-                                     const struct video_device *template,
-                                     const int type,
-                                     const char *type_name)
+static struct video_device *em28xx_vdev_init(struct em28xx *dev,
+                                            const struct video_device *template,
+                                            const int type,
+                                            const char *type_name)
 {
        struct video_device *vfd;
 
 
 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
                          int len);
 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len);
-int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
-                         u8 bitmask);
 int em28xx_set_audio_source(struct em28xx *dev);
 int em28xx_audio_analog_set(struct em28xx *dev);