[alsa-devel] [PATCH 2/2] ASoC: TWL4030: Add voice digital loopback: sidetone

[Lopez Cruz, Misael]

This patch add voice digital loopback (sidetone) to the twl4030
driver. It mixes voice uplink attenuated (by sidetone gain) with
voice downlink when the codec is working in option2 (voice/audio
mode).

Signed-off-by: Misael Lopez Cruz <x0052729 at ti.com>
---
 sound/soc/codecs/twl4030.c |   27 +++++++++++++++++++++++++--
 1 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index efb371f..23bae74 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -491,6 +491,18 @@ static const struct snd_kcontrol_new twl4030_dapm_dbypassr_control =
 			TWL4030_REG_ATX2ARXPGA, 0, 7, 0,
 			twl4030_dapm_dbypass_tlv);
 
+/*
+ * Voice Sidetone GAIN volume control:
+ * from -51 to -10 dB in 1 dB steps (mute instead of -51 dB)
+ */
+static DECLARE_TLV_DB_SCALE(twl4030_dapm_dbypassv_tlv, -5100, 100, 1);
+
+/* Digital bypass voice: sidetone (VUL -> VDL)*/
+static const struct snd_kcontrol_new twl4030_dapm_dbypassv_control =
+	SOC_DAPM_SINGLE_TLV("Volume",
+			TWL4030_REG_VSTPGA, 0, 0x29, 0,
+			twl4030_dapm_dbypassv_tlv);
+
 static int micpath_event(struct snd_soc_dapm_widget *w,
 	struct snd_kcontrol *kcontrol, int event)
 {
@@ -607,12 +619,18 @@ static int bypass_event(struct snd_soc_dapm_widget *w,
 			twl4030->bypass_state |= (1 << 4);
 		else
 			twl4030->bypass_state &= ~(1 << 4);
+	} else if (m->reg == TWL4030_REG_VSTPGA) {
+		/* Voice digital bypass */
+		if (reg)
+			twl4030->bypass_state |= (1 << 5);
+		else
+			twl4030->bypass_state &= ~(1 << 5);
 	} else {
 		/* Digital bypass */
 		if (reg & (0x7 << m->shift))
-			twl4030->bypass_state |= (1 << (m->shift ? 6 : 5));
+			twl4030->bypass_state |= (1 << (m->shift ? 7 : 6));
 		else
-			twl4030->bypass_state &= ~(1 << (m->shift ? 6 : 5));
+			twl4030->bypass_state &= ~(1 << (m->shift ? 7 : 6));
 	}
 
 	/* Enable master analog loopback mode if any analog switch is enabled*/
@@ -991,6 +1009,9 @@ static const struct snd_soc_dapm_widget twl4030_dapm_widgets[] = {
 	SND_SOC_DAPM_SWITCH_E("Right Digital Loopback", SND_SOC_NOPM, 0, 0,
 			&twl4030_dapm_dbypassr_control, bypass_event,
 			SND_SOC_DAPM_POST_REG),
+	SND_SOC_DAPM_SWITCH_E("Voice Digital Loopback", SND_SOC_NOPM, 0, 0,
+			&twl4030_dapm_dbypassv_control, bypass_event,
+			SND_SOC_DAPM_POST_REG),
 
 	SND_SOC_DAPM_MIXER("Analog R1 Playback Mixer", TWL4030_REG_AVDAC_CTL,
 			0, 0, NULL, 0),
@@ -1203,9 +1224,11 @@ static const struct snd_soc_dapm_route intercon[] = {
 	/* Digital bypass routes */
 	{"Right Digital Loopback", "Volume", "TX1 Capture Route"},
 	{"Left Digital Loopback", "Volume", "TX1 Capture Route"},
+	{"Voice Digital Loopback", "Volume", "TX2 Capture Route"},
 
 	{"Analog R2 Playback Mixer", NULL, "Right Digital Loopback"},
 	{"Analog L2 Playback Mixer", NULL, "Left Digital Loopback"},
+	{"Analog Voice Playback Mixer", NULL, "Voice Digital Loopback"},
 
 };
 
-- 
1.5.4.3