[PATCH v2] ASoC: rt5645: add DAC1 soft volume func control

[Bard Liao <bardliao@realtek.com>]

This patch add an alsa control for DAC1 digital volume control function
selection. The options are:
0: Gain update immediately
1: Gain update when a zero crossing
2: Gain update when a zero crossing with a soft ramp

Signed-off-by: Bard Liao <bardliao@realtek.com>
---
v2
* Use SOC_ENUM
---
 sound/soc/codecs/rt5645.c | 11 +++++++++++
 sound/soc/codecs/rt5645.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index 9251720..aefce8f 100644
--- a/sound/soc/codecs/rt5645.c
+++ b/sound/soc/codecs/rt5645.c
@@ -742,6 +742,14 @@ static int rt5645_spk_put_volsw(struct snd_kcontrol *kcontrol,
 	return ret;
 }
 
+static const char * const rt5645_dac1_vol_ctrl_mode_text[] = {
+	"immediately", "zero crossing", "soft ramp"
+};
+
+static SOC_ENUM_SINGLE_DECL(
+	rt5645_dac1_vol_ctrl_mode, RT5645_PR_BASE,
+	RT5645_DA1_ZDET_SFT, rt5645_dac1_vol_ctrl_mode_text);
+
 static const struct snd_kcontrol_new rt5645_snd_controls[] = {
 	/* Speaker Output Volume */
 	SOC_DOUBLE("Speaker Channel Switch", RT5645_SPK_VOL,
@@ -808,6 +816,9 @@ static const struct snd_kcontrol_new rt5645_snd_controls[] = {
 	SOC_SINGLE("I2S2 Func Switch", RT5645_GPIO_CTRL1, RT5645_I2S2_SEL_SFT,
 		1, 1),
 	RT5645_HWEQ("Speaker HWEQ"),
+
+	/* Digital Soft Volume Control */
+	SOC_ENUM("DAC1 Digital Volume Control Func", rt5645_dac1_vol_ctrl_mode),
 };
 
 /**
diff --git a/sound/soc/codecs/rt5645.h b/sound/soc/codecs/rt5645.h
index 205e071..cfc5f97 100644
--- a/sound/soc/codecs/rt5645.h
+++ b/sound/soc/codecs/rt5645.h
@@ -2018,6 +2018,9 @@
 
 
 /* Codec Private Register definition */
+/* DAC ADC Digital Volume (0x00) */
+#define RT5645_DA1_ZDET_SFT			6
+
 /* 3D Speaker Control (0x63) */
 #define RT5645_3D_SPK_MASK			(0x1 << 15)
 #define RT5645_3D_SPK_SFT			15
-- 
1.8.1.1.439.g50a6b54