AC97_SINGLE("Front Playback Switch", AC97_WM97XX_FMIXER_VOL, 15, 1, 1),
 };
 
-int patch_wolfson_wm9703_specific(ac97_t * ac97)
+static int patch_wolfson_wm9703_specific(ac97_t * ac97)
 {
        /* This is known to work for the ViewSonic ViewPad 1000
         * Randolph Bentson <bentson@holmsjoen.com>
 AC97_DOUBLE("Surround Volume", AC97_SURROUND_MASTER, 8, 0, 31, 1),
 };
 
-int patch_wolfson_wm9704_specific(ac97_t * ac97)
+static int patch_wolfson_wm9704_specific(ac97_t * ac97)
 {
        int err, i;
        for (i = 0; i < ARRAY_SIZE(wm9704_snd_ac97_controls); i++) {
        return 0;
 }
 
-int patch_wolfson_wm9705_specific(ac97_t * ac97)
+static int patch_wolfson_wm9705_specific(ac97_t * ac97)
 {
        int err, i;
        for (i = 0; i < ARRAY_SIZE(wm97xx_snd_ac97_controls); i++) {
 AC97_SINGLE("Mono ZC Switch", AC97_MASTER_MONO, 7, 1, 0),
 };
 
-int patch_wolfson_wm9711_specific(ac97_t * ac97)
+static int patch_wolfson_wm9711_specific(ac97_t * ac97)
 {
        int err, i;