[ALSA] oxygen: add control filter to model struct

Allow the models to modify mixer controls before they are added to the
card.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index 9b0234d..7278c15 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -35,6 +35,7 @@
 struct snd_card;
 struct snd_pcm_substream;
 struct snd_pcm_hw_params;
+struct snd_kcontrol_new;
 struct snd_rawmidi;
 struct oxygen_model;
 
@@ -71,6 +72,7 @@
 	const char *chip;
 	struct module *owner;
 	void (*init)(struct oxygen *chip);
+	int (*control_filter)(struct snd_kcontrol_new *template);
 	int (*mixer_init)(struct oxygen *chip);
 	void (*cleanup)(struct oxygen *chip);
 	void (*set_dac_params)(struct oxygen *chip,
@@ -79,10 +81,7 @@
 			       struct snd_pcm_hw_params *params);
 	void (*update_dac_volume)(struct oxygen *chip);
 	void (*update_dac_mute)(struct oxygen *chip);
-	const unsigned int *dac_tlv;
 	u8 used_channels;
-	u8 cd_in_from_video_in;
-	u8 dac_minimum_volume;
 	u8 function_flags;
 };