ALSA: hda - add controls to toggle DC bias on mic ports

This patch adds a mixer control for the STAC92XX boards to control the
DC bias of mic ports, allowing recording from both powered and
non-powered sources.  It replaces the "Mic Output Switch" with "Mic Jack
Mode" to switch between Mic, Line In, and Line Out.

Signed-off-by: Nickolas Lloyd <ultrageek.lloyd@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 107 insertions, 4 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index ecf53f755a09..02950980778e 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -634,6 +634,96 @@ static int stac92xx_smux_enum_put(struct snd_kcontrol *kcontrol,
         return 0;
 }
 
+static unsigned int stac92xx_vref_set(struct hda_codec *codec,
+                                        hda_nid_t nid, unsigned int new_vref)
+{
+        unsigned int error;
+        unsigned int pincfg;
+        pincfg = snd_hda_codec_read(codec, nid, 0,
+                                AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
+
+        pincfg &= 0xff;
+        pincfg &= ~(AC_PINCTL_VREFEN | AC_PINCTL_IN_EN | AC_PINCTL_OUT_EN);
+        pincfg |= new_vref;
+
+        if (new_vref == AC_PINCTL_VREF_HIZ)
+                pincfg |= AC_PINCTL_OUT_EN;
+        else
+                pincfg |= AC_PINCTL_IN_EN;
+
+        error = snd_hda_codec_write_cache(codec, nid, 0,
+                                        AC_VERB_SET_PIN_WIDGET_CONTROL, pincfg);
+        if (error < 0)
+                return error;
+        else
+                return 1;
+}
+
+static unsigned int stac92xx_vref_get(struct hda_codec *codec, hda_nid_t nid)
+{
+        unsigned int vref;
+        vref = snd_hda_codec_read(codec, nid, 0,
+                                AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
+        vref &= AC_PINCTL_VREFEN;
+        return vref;
+}
+
+static int stac92xx_dc_bias_put(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_value *ucontrol)
+{
+        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int new_vref;
+        unsigned int error;
+
+        if (ucontrol->value.enumerated.item[0] == 0)
+                new_vref = AC_PINCTL_VREF_80;
+        else if (ucontrol->value.enumerated.item[0] == 1)
+                new_vref = AC_PINCTL_VREF_GRD;
+        else
+                new_vref = AC_PINCTL_VREF_HIZ;
+
+        if (new_vref != stac92xx_vref_get(codec, kcontrol->private_value)) {
+                error = stac92xx_vref_set(codec,
+                                        kcontrol->private_value, new_vref);
+                return error;
+        }
+
+        return 0;
+}
+
+static int stac92xx_dc_bias_get(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_value *ucontrol)
+{
+        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+        unsigned int vref = stac92xx_vref_get(codec, kcontrol->private_value);
+        if (vref == AC_PINCTL_VREF_80)
+                ucontrol->value.enumerated.item[0] = 0;
+        else if (vref == AC_PINCTL_VREF_GRD)
+                ucontrol->value.enumerated.item[0] = 1;
+        else if (vref == AC_PINCTL_VREF_HIZ)
+                ucontrol->value.enumerated.item[0] = 2;
+
+        return 0;
+}
+
+static int stac92xx_dc_bias_info(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_info *uinfo)
+{
+        static char *texts[] = {
+                "Mic In", "Line In", "Line Out"
+        };
+
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        uinfo->value.enumerated.items = 3;
+        uinfo->count = 1;
+        if (uinfo->value.enumerated.item >= 3)
+                uinfo->value.enumerated.item = 2;
+        strcpy(uinfo->value.enumerated.name,
+                texts[uinfo->value.enumerated.item]);
+
+        return 0;
+}
+
 static int stac92xx_mux_enum_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
         struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
@@ -995,6 +1085,17 @@ static struct hda_verb stac9205_core_init[] = {
                 .private_value = verb_read | (verb_write << 16), \
         }
 
+#define DC_BIAS(xname, idx, nid) \
+        { \
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+                .name = xname, \
+                .index = idx, \
+                .info = stac92xx_dc_bias_info, \
+                .get = stac92xx_dc_bias_get, \
+                .put = stac92xx_dc_bias_put, \
+                .private_value = nid, \
+        }
+
 static struct snd_kcontrol_new stac9200_mixer[] = {
         HDA_CODEC_VOLUME("Master Playback Volume", 0xb, 0, HDA_OUTPUT),
         HDA_CODEC_MUTE("Master Playback Switch", 0xb, 0, HDA_OUTPUT),
@@ -2702,7 +2803,8 @@ enum {
         STAC_CTL_WIDGET_AMP_VOL,
         STAC_CTL_WIDGET_HP_SWITCH,
         STAC_CTL_WIDGET_IO_SWITCH,
-        STAC_CTL_WIDGET_CLFE_SWITCH
+        STAC_CTL_WIDGET_CLFE_SWITCH,
+        STAC_CTL_WIDGET_DC_BIAS
 };
 
 static struct snd_kcontrol_new stac92xx_control_templates[] = {
@@ -2714,6 +2816,7 @@ static struct snd_kcontrol_new stac92xx_control_templates[] = {
         STAC_CODEC_HP_SWITCH(NULL),
         STAC_CODEC_IO_SWITCH(NULL, 0),
         STAC_CODEC_CLFE_SWITCH(NULL, 0),
+        DC_BIAS(NULL, 0, 0),
 };
 
 /* add dynamic controls */
@@ -3165,9 +3268,9 @@ static int stac92xx_auto_create_multi_out_ctls(struct hda_codec *codec,
         }
 
         if (spec->mic_switch) {
-                err = stac92xx_add_control(spec, STAC_CTL_WIDGET_IO_SWITCH,
-                                           "Mic as Output Switch",
-                                           (spec->mic_switch << 8) | 1);
+                err = stac92xx_add_control(spec, STAC_CTL_WIDGET_DC_BIAS,
+                                           "Mic Jack Mode",
+                                           spec->mic_switch);
                 if (err < 0)
                         return err;
         }