[PATCH 6/6 v3] ASoC: rsnd: Add Volume Ramp support

[Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>]

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

This patch adds Volume Ramp to Renesas sound driver.

Below sample indicates
Mute -> Volume 100% -> Mute.
Here,
 - Mute        (= Normal Volume x 0%)
 - Volume 100% (= Normal Volume x 100%)

amixer set "DVC Out" 100%      // = Normal Volume
amixer set "DVC Out Ramp Up Rate"   "0.125 dB/64 steps"
amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
amixer set "DVC Out Ramp" 0%   // Mute = Normal Volume x 0%
amixer set "DVC Out Ramp" on   // Volume Ramp ON
aplay xxx.wav &
amixer set "DVC Out Ramp" 100% // Mute to Normal Volume x 100%
amixer set "DVC Out Ramp" 0%   // Normal Volume x 100% to Mute

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v2 -> v3

 - use enumerated list
 - it is using datasheet words (= xxx dB / yy step)

 sound/soc/sh/rcar/dvc.c  |   74 ++++++++++++++++++++++++++++++++++++++++++++++
 sound/soc/sh/rcar/gen.c  |    3 ++
 sound/soc/sh/rcar/rsnd.h |    6 ++++
 3 files changed, 83 insertions(+)

diff --git a/sound/soc/sh/rcar/dvc.c b/sound/soc/sh/rcar/dvc.c
index 8504f6b..0b38f888 100644
--- a/sound/soc/sh/rcar/dvc.c
+++ b/sound/soc/sh/rcar/dvc.c
@@ -38,6 +38,10 @@ struct rsnd_dvc {
 	struct clk *clk;
 	struct rsnd_dvc_cfg_m volume;
 	struct rsnd_dvc_cfg_m mute;
+	struct rsnd_dvc_cfg_s ren;	/* Ramp Enable */
+	struct rsnd_dvc_cfg_s rup;	/* Ramp Rate Up */
+	struct rsnd_dvc_cfg_s rdown;	/* Ramp Rate Down */
+	struct rsnd_dvc_cfg_s rvol;	/* Ramp Volume */
 };
 
 #define rsnd_mod_to_dvc(_mod)	\
@@ -49,6 +53,33 @@ struct rsnd_dvc {
 	     ((pos) = (struct rsnd_dvc *)(priv)->dvc + i);	\
 	     i++)
 
+static const char const *dvc_ramp_rate[] = {
+	"128 dB/1 step",	 /* 00000 */
+	"64 dB/1 step",		 /* 00001 */
+	"32 dB/1 step",		 /* 00010 */
+	"16 dB/1 step",		 /* 00011 */
+	"8 dB/1 step",		 /* 00100 */
+	"4 dB/1 step",		 /* 00101 */
+	"2 dB/1 step",		 /* 00110 */
+	"1 dB/1 step",		 /* 00111 */
+	"0.5 dB/1 step",	 /* 01000 */
+	"0.25 dB/1 step",	 /* 01001 */
+	"0.125 dB/1 step",	 /* 01010 */
+	"0.125 dB/2 steps",	 /* 01011 */
+	"0.125 dB/4 steps",	 /* 01100 */
+	"0.125 dB/8 steps",	 /* 01101 */
+	"0.125 dB/16 steps",	 /* 01110 */
+	"0.125 dB/32 steps",	 /* 01111 */
+	"0.125 dB/64 steps",	 /* 10000 */
+	"0.125 dB/128 steps",	 /* 10001 */
+	"0.125 dB/256 steps",	 /* 10010 */
+	"0.125 dB/512 steps",	 /* 10011 */
+	"0.125 dB/1024 steps",	 /* 10100 */
+	"0.125 dB/2048 steps",	 /* 10101 */
+	"0.125 dB/4096 steps",	 /* 10110 */
+	"0.125 dB/8192 steps",	 /* 10111 */
+};
+
 static void rsnd_dvc_volume_update(struct rsnd_mod *mod)
 {
 	struct rsnd_dvc *dvc = rsnd_mod_to_dvc(mod);
@@ -67,6 +98,17 @@ static void rsnd_dvc_volume_update(struct rsnd_mod *mod)
 	rsnd_mod_write(mod, DVC_VOL0R, dvc->volume.val[0]);
 	rsnd_mod_write(mod, DVC_VOL1R, dvc->volume.val[1]);
 
+	/* Enable Ramp */
+	if (dvc->ren.val) {
+		dvucr |= 0x10;
+		rsnd_mod_write(mod, DVC_VRCTR, 0xff);
+		rsnd_mod_write(mod, DVC_VRPDR, dvc->rup.val << 8 |
+					       dvc->rdown.val);
+		/* use inverted value for user experience */
+		rsnd_mod_write(mod, DVC_VRDBR, dvc->rvol.cfg.max -
+					       dvc->rvol.val);
+	}
+
 	/*  Enable Mute */
 	if (mute) {
 		dvucr |= 0x1;
@@ -323,6 +365,38 @@ static int rsnd_dvc_pcm_new(struct rsnd_mod *mod,
 	if (ret < 0)
 		return ret;
 
+	/* Ramp */
+	ret = _rsnd_dvc_pcm_new_s(mod, rdai, rtd,
+			rsnd_dai_is_play(rdai, io) ?
+			"DVC Out Ramp Switch" : "DVC In Ramp Switch",
+			&dvc->ren, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = _rsnd_dvc_pcm_new_e(mod, rdai, rtd,
+			rsnd_dai_is_play(rdai, io) ?
+			"DVC Out Ramp Up Rate" : "DVC In Ramp Up Rate",
+			&dvc->rup,
+			dvc_ramp_rate, ARRAY_SIZE(dvc_ramp_rate));
+	if (ret < 0)
+		return ret;
+
+	ret = _rsnd_dvc_pcm_new_e(mod, rdai, rtd,
+			rsnd_dai_is_play(rdai, io) ?
+			"DVC Out Ramp Down Rate" : "DVC In Ramp Down Rate",
+			&dvc->rdown,
+			dvc_ramp_rate, ARRAY_SIZE(dvc_ramp_rate));
+
+	if (ret < 0)
+		return ret;
+
+	ret = _rsnd_dvc_pcm_new_s(mod, rdai, rtd,
+			rsnd_dai_is_play(rdai, io) ?
+			"DVC Out Ramp Volume" : "DVC In Ramp Volume",
+			&dvc->rvol, 0x3ff);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }
 
diff --git a/sound/soc/sh/rcar/gen.c b/sound/soc/sh/rcar/gen.c
index 61dee68..4cb3202 100644
--- a/sound/soc/sh/rcar/gen.c
+++ b/sound/soc/sh/rcar/gen.c
@@ -324,6 +324,9 @@ static int rsnd_gen2_probe(struct platform_device *pdev,
 		RSND_GEN_M_REG(DVC_ADINR,	0xe08,	0x100),
 		RSND_GEN_M_REG(DVC_DVUCR,	0xe10,	0x100),
 		RSND_GEN_M_REG(DVC_ZCMCR,	0xe14,	0x100),
+		RSND_GEN_M_REG(DVC_VRCTR,	0xe18,	0x100),
+		RSND_GEN_M_REG(DVC_VRPDR,	0xe1c,	0x100),
+		RSND_GEN_M_REG(DVC_VRDBR,	0xe20,	0x100),
 		RSND_GEN_M_REG(DVC_VOL0R,	0xe28,	0x100),
 		RSND_GEN_M_REG(DVC_VOL1R,	0xe2c,	0x100),
 		RSND_GEN_M_REG(DVC_DVUER,	0xe48,	0x100),
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index d119adf..ed44ca8 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -91,6 +91,9 @@ enum rsnd_reg {
 	RSND_REG_SHARE20,
 	RSND_REG_SHARE21,
 	RSND_REG_SHARE22,
+	RSND_REG_SHARE23,
+	RSND_REG_SHARE24,
+	RSND_REG_SHARE25,
 
 	RSND_REG_MAX,
 };
@@ -129,6 +132,9 @@ enum rsnd_reg {
 #define RSND_REG_CMD_CTRL		RSND_REG_SHARE20
 #define RSND_REG_CMDOUT_TIMSEL		RSND_REG_SHARE21
 #define RSND_REG_BUSIF_DALIGN		RSND_REG_SHARE22
+#define RSND_REG_DVC_VRCTR		RSND_REG_SHARE23
+#define RSND_REG_DVC_VRPDR		RSND_REG_SHARE24
+#define RSND_REG_DVC_VRDBR		RSND_REG_SHARE25
 
 struct rsnd_of_data;
 struct rsnd_priv;
-- 
1.7.9.5