[ALSA] AD1888 mixer controls for DC mode

This patch adds two mixer controls. The V_REFOUT enable is a
documented register that couples the microphone input lines
to the V_REFOUT DC source. The High Pass Filter enable in the
AC97_AD_TEST2 (0x5c) is an undocumented register provided by
Miller Puckette via Analog Devices that enables the AD codec
to apply a high pass filter to the input.

Signed-off-by: Jaya Kumar <jayakumar.alsa@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 446afc3..758f8bf 100644 (file)
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -265,6 +265,7 @@
 
 /* specific - Analog Devices */
 #define AC97_AD_TEST           0x5a    /* test register */
+#define AC97_AD_TEST2          0x5c    /* undocumented test register 2 */
 #define AC97_AD_CODEC_CFG      0x70    /* codec configuration */
 #define AC97_AD_JACK_SPDIF     0x72    /* Jack Sense & S/PDIF */
 #define AC97_AD_SERIAL_CFG     0x74    /* Serial Configuration */

diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index 7f197c7..094cfc1 100644 (file)
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -1824,6 +1824,8 @@ static const struct snd_kcontrol_new snd_ac97_ad1888_controls[] = {
                .get = snd_ac97_ad1888_lohpsel_get,
                .put = snd_ac97_ad1888_lohpsel_put
        },
+       AC97_SINGLE("V_REFOUT Enable", AC97_AD_MISC, 2, 1, 1),
+       AC97_SINGLE("High Pass Filter Enable", AC97_AD_TEST2, 12, 1, 1),
        AC97_SINGLE("Spread Front to Surround and Center/LFE", AC97_AD_MISC, 7, 1, 0),
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,