[ALSA] hda-codec - add support for analog loopback to STAC9204/9205/922x/927x

The analog loopback routes the sound just before it enters ADC0
to output of DAC0.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 58 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 297f74019279..c94775c8a0bf 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -147,6 +147,7 @@ struct sigmatel_spec {
         /* i/o switches */
         unsigned int io_switch[2];
         unsigned int clfe_swap;
+        unsigned int aloopback;
 
         struct hda_pcm pcm_rec[2];      /* PCM information */
 
@@ -296,6 +297,49 @@ static int stac92xx_mux_enum_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
                                      spec->mux_nids[adc_idx], &spec->cur_mux[adc_idx]);
 }
 
+#define stac92xx_aloopback_info snd_ctl_boolean_mono_info
+
+static int stac92xx_aloopback_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct sigmatel_spec *spec = codec->spec;
+
+        ucontrol->value.integer.value[0] = spec->aloopback;
+        return 0;
+}
+
+static int stac92xx_aloopback_put(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_value *ucontrol)
+{
+        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct sigmatel_spec *spec = codec->spec;
+        unsigned int dac_mode;
+
+        if (spec->aloopback == ucontrol->value.integer.value[0])
+                return 0;
+
+        spec->aloopback = ucontrol->value.integer.value[0];
+
+
+        dac_mode = snd_hda_codec_read(codec, codec->afg, 0,
+                kcontrol->private_value & 0xFFFF, 0x0);
+
+        if (spec->aloopback) {
+                snd_hda_power_up(codec);
+                dac_mode |= 0x40;
+        } else {
+                snd_hda_power_down(codec);
+                dac_mode &= ~0x40;
+        }
+
+        snd_hda_codec_write_cache(codec, codec->afg, 0,
+                kcontrol->private_value >> 16, dac_mode);
+
+        return 1;
+}
+
+
 static struct hda_verb stac9200_core_init[] = {
         /* set dac0mux for dac converter */
         { 0x07, AC_VERB_SET_CONNECT_SEL, 0x00},
@@ -346,6 +390,17 @@ static struct hda_verb stac9205_core_init[] = {
                 .put = stac92xx_mux_enum_put, \
         }
 
+#define STAC_ANALOG_LOOPBACK(verb_read,verb_write) \
+        { \
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+                .name  = "Analog Loopback", \
+                .count = 1, \
+                .info  = stac92xx_aloopback_info, \
+                .get   = stac92xx_aloopback_get, \
+                .put   = stac92xx_aloopback_put, \
+                .private_value = verb_read | (verb_write << 16), \
+        }
+
 
 static struct snd_kcontrol_new stac9200_mixer[] = {
         HDA_CODEC_VOLUME("Master Playback Volume", 0xb, 0, HDA_OUTPUT),
@@ -377,6 +432,7 @@ static struct snd_kcontrol_new stac922x_mixer[] = {
 /* This needs to be generated dynamically based on sequence */
 static struct snd_kcontrol_new stac9227_mixer[] = {
         STAC_INPUT_SOURCE,
+        STAC_ANALOG_LOOPBACK(0xFEB, 0x7EB),
         HDA_CODEC_VOLUME("Capture Volume", 0x15, 0x0, HDA_OUTPUT),
         HDA_CODEC_MUTE("Capture Switch", 0x1b, 0x0, HDA_OUTPUT),
         { } /* end */
@@ -384,6 +440,7 @@ static struct snd_kcontrol_new stac9227_mixer[] = {
 
 static struct snd_kcontrol_new stac927x_mixer[] = {
         STAC_INPUT_SOURCE,
+        STAC_ANALOG_LOOPBACK(0xFEB, 0x7EB),
         HDA_CODEC_VOLUME("InMux Capture Volume", 0x15, 0x0, HDA_OUTPUT),
         HDA_CODEC_VOLUME("InVol Capture Volume", 0x18, 0x0, HDA_INPUT),
         HDA_CODEC_MUTE("ADCMux Capture Switch", 0x1b, 0x0, HDA_OUTPUT),
@@ -400,6 +457,7 @@ static struct snd_kcontrol_new stac9205_mixer[] = {
                 .put = stac92xx_dmux_enum_put,
         },
         STAC_INPUT_SOURCE,
+        STAC_ANALOG_LOOPBACK(0xFE0, 0x7E0),
         HDA_CODEC_VOLUME("InMux Capture Volume", 0x19, 0x0, HDA_OUTPUT),
         HDA_CODEC_VOLUME("InVol Capture Volume", 0x1b, 0x0, HDA_INPUT),
         HDA_CODEC_MUTE("ADCMux Capture Switch", 0x1d, 0x0, HDA_OUTPUT),