[alsa-devel] [PATCH] ASoC: ak4642: Add Playback Volume control

[Kuninori Morimoto]

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
This patch works for me.
But I'm not sure it is correct settings.
Please check it carefully

 sound/soc/codecs/ak4642.c |   28 +++++++++++++++++++++++++---
 1 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/ak4642.c b/sound/soc/codecs/ak4642.c
index 9a6157f..ce4e6ec 100644
--- a/sound/soc/codecs/ak4642.c
+++ b/sound/soc/codecs/ak4642.c
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <sound/soc-dapm.h>
 #include <sound/initval.h>
+#include <sound/tlv.h>
 
 #include "ak4642.h"
 
@@ -103,6 +104,23 @@
 
 struct snd_soc_codec_device soc_codec_dev_ak4642;
 
+/*
+ * Playback Volume (table 39)
+ *
+ * max : 0x00 : +12.0 dB
+ *       ( 0.5 dB step )
+ * min : 0xFE : -115.0 dB
+ * mute: 0xFF
+ */
+static const DECLARE_TLV_DB_SCALE(out_tlv, -11500, 50, 1);
+
+static const struct snd_kcontrol_new ak4642_snd_controls[] = {
+
+	SOC_DOUBLE_R_TLV("Playback Volume", L_DVC, R_DVC,
+			 0, 0xFF, 1, out_tlv),
+};
+
+
 /* codec private data */
 struct ak4642_priv {
 	struct snd_soc_codec codec;
@@ -190,7 +208,6 @@ static int ak4642_dai_startup(struct snd_pcm_substream *substream,
 		 *
 		 * PLL, Master Mode
 		 * Audio I/F Format :MSB justified (ADC & DAC)
-		 * Digital Volume: -8dB
 		 * Bass Boost Level : Middle
 		 *
 		 * This operation came from example code of
@@ -200,8 +217,6 @@ static int ak4642_dai_startup(struct snd_pcm_substream *substream,
 		ak4642_write(codec, 0x0e, 0x19);
 		ak4642_write(codec, 0x09, 0x91);
 		ak4642_write(codec, 0x0c, 0x91);
-		ak4642_write(codec, 0x0a, 0x28);
-		ak4642_write(codec, 0x0d, 0x28);
 		ak4642_write(codec, 0x00, 0x64);
 		snd_soc_update_bits(codec, PW_MGMT2, PMHP_MASK,	PMHP);
 		snd_soc_update_bits(codec, PW_MGMT2, HPMTN,	HPMTN);
@@ -446,6 +461,10 @@ static int ak4642_init(struct ak4642_priv *ak4642)
 		return ret;
 	}
 
+	/* default volume */
+	ak4642_write(codec, L_DVC, 0x28);
+	ak4642_write(codec, R_DVC, 0x28);
+
 	return ret;
 }
 
@@ -524,6 +543,9 @@ static int ak4642_probe(struct platform_device *pdev)
 		goto pcm_err;
 	}
 
+	snd_soc_add_controls(ak4642_codec, ak4642_snd_controls,
+			     ARRAY_SIZE(ak4642_snd_controls));
+
 	dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
 	return ret;
 
-- 
1.7.0.4