[alsa-devel] [PATCH v2] ASoC: da7210: Add HeadPhone Playback Volume control

[Kuninori Morimoto]

HeadPhone Playback Volume control register of DA7210 has
reserved area. This patch considered it as mute.

This patch add HeadPhone Playback Volume 40 as default,
because DA7210 doesn't have default volume.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
v1 -> v2

o based on ASoC's git tree
  (add #include <sound/tlv.h>)

 sound/soc/codecs/da7210.c |   38 ++++++++++++++++++++++++++++++++++----
 1 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/da7210.c b/sound/soc/codecs/da7210.c
index a83aa18..ec292cc 100644
--- a/sound/soc/codecs/da7210.c
+++ b/sound/soc/codecs/da7210.c
@@ -23,6 +23,7 @@
 #include <sound/pcm_params.h>
 #include <sound/soc-dapm.h>
 #include <sound/initval.h>
+#include <sound/tlv.h>
 
 #include "da7210.h"
 
@@ -136,6 +137,29 @@
 
 #define DA7210_VERSION "0.0.1"
 
+/*
+ * Playback Volume
+ *
+ * max		: 0x3F (+15.0 dB)
+ *		   (1.5 dB step)
+ * min		: 0x11 (-54.0 dB)
+ * mute		: 0x10
+ * reserved	: 0x00 - 0x0F
+ *
+ * ** FIXME **
+ *
+ * Reserved area are considered as "mute".
+ * -> min = -79.5 dB
+ */
+static const DECLARE_TLV_DB_SCALE(hp_out_tlv, -7950, 150, 1);
+
+static const struct snd_kcontrol_new da7210_snd_controls[] = {
+
+	SOC_DOUBLE_R_TLV("HeadPhone Playback Volume",
+			 DA7210_HP_L_VOL, DA7210_HP_R_VOL,
+			 0, 0x3F, 0, hp_out_tlv),
+};
+
 /* Codec private data */
 struct da7210_priv {
 	struct snd_soc_codec codec;
@@ -218,10 +242,6 @@ static int da7210_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_codec *codec = dai->codec;
 
 	if (is_play) {
-		/* PlayBack Volume 40 */
-		snd_soc_update_bits(codec, DA7210_HP_L_VOL, 0x3F, 40);
-		snd_soc_update_bits(codec, DA7210_HP_R_VOL, 0x3F, 40);
-
 		/* Enable Out */
 		snd_soc_update_bits(codec, DA7210_OUTMIX_L, 0x1F, 0x10);
 		snd_soc_update_bits(codec, DA7210_OUTMIX_R, 0x1F, 0x10);
@@ -563,6 +583,13 @@ static int da7210_init(struct da7210_priv *da7210)
 	/* Activate all enabled subsystem */
 	da7210_write(codec, DA7210_STARTUP1, DA7210_SC_MST_EN);
 
+	/*
+	 * HeadPhone PlayBack Volume 40 is given here
+	 * because DA7210 doesn't have default volume.
+	 */
+	snd_soc_update_bits(codec, DA7210_HP_L_VOL, 0x3F, 40);
+	snd_soc_update_bits(codec, DA7210_HP_R_VOL, 0x3F, 40);
+
 	return ret;
 
 init_err:
@@ -647,6 +674,9 @@ static int da7210_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto pcm_err;
 
+	snd_soc_add_controls(da7210_codec, da7210_snd_controls,
+			     ARRAY_SIZE(da7210_snd_controls));
+
 	dev_info(&pdev->dev, "DA7210 Audio Codec %s\n", DA7210_VERSION);
 
 pcm_err:
-- 
1.7.0.4