[alsa-devel] [RFC PATCH 29/34] ASoC: sun8i-codec: Add AIF, ADC, and DAC volume controls

[Samuel Holland]

This allows changing the volume of each digital input/output
independently, and provides the only "master volume" for the DAC.
(The ADC also has a gain control on the analog side.)

While the hardware supports volumes up to +72dB, the controls here
are limited to +24dB maximum, as anything more makes volume sliders
difficult to use, and is extremely likely to cause clipping (this is
simple digital gain).

Signed-off-by: Samuel Holland <samuel at sholland.org>
---
 sound/soc/sunxi/sun8i-codec.c | 56 +++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index 245145e36357..71cd7646a895 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -21,6 +21,7 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
+#include <sound/tlv.h>
 
 #define SUN8I_SYSCLK_CTL				0x00c
 #define SUN8I_SYSCLK_CTL_AIF1CLK_ENA			11
@@ -73,6 +74,12 @@
 #define SUN8I_AIF1_MXR_SRC_AD0R_MXR_SRC_AIF2DACR	10
 #define SUN8I_AIF1_MXR_SRC_AD0R_MXR_SRC_ADCR		9
 #define SUN8I_AIF1_MXR_SRC_AD0R_MXR_SRC_AIF2DACL	8
+#define SUN8I_AIF1_VOL_CTRL1				0x050
+#define SUN8I_AIF1_VOL_CTRL1_AD0L_VOL			8
+#define SUN8I_AIF1_VOL_CTRL1_AD0R_VOL			0
+#define SUN8I_AIF1_VOL_CTRL3				0x058
+#define SUN8I_AIF1_VOL_CTRL3_DA0L_VOL			8
+#define SUN8I_AIF1_VOL_CTRL3_DA0R_VOL			0
 #define SUN8I_AIF2_ADCDAT_CTRL				0x084
 #define SUN8I_AIF2_ADCDAT_CTRL_AIF2_ADCL_ENA		15
 #define SUN8I_AIF2_ADCDAT_CTRL_AIF2_ADCR_ENA		14
@@ -93,6 +100,12 @@
 #define SUN8I_AIF2_MXR_SRC_ADCR_MXR_SRC_AIF1DA1R	10
 #define SUN8I_AIF2_MXR_SRC_ADCR_MXR_SRC_AIF2DACL	9
 #define SUN8I_AIF2_MXR_SRC_ADCR_MXR_SRC_ADCR		8
+#define SUN8I_AIF2_VOL_CTRL1				0x090
+#define SUN8I_AIF2_VOL_CTRL1_ADCL_VOL			8
+#define SUN8I_AIF2_VOL_CTRL1_ADCR_VOL			0
+#define SUN8I_AIF2_VOL_CTRL2				0x098
+#define SUN8I_AIF2_VOL_CTRL2_DACL_VOL			8
+#define SUN8I_AIF2_VOL_CTRL2_DACR_VOL			0
 #define SUN8I_AIF3_CLK_CTRL_AIF3_CLOCK_SRC_AIF1		(0x0 << 0)
 #define SUN8I_AIF3_CLK_CTRL_AIF3_CLOCK_SRC_AIF2		(0x1 << 0)
 #define SUN8I_AIF3_CLK_CTRL_AIF3_CLOCK_SRC_AIF1CLK	(0x2 << 0)
@@ -106,8 +119,14 @@
 #define SUN8I_ADC_DIG_CTRL_ENAD				15
 #define SUN8I_ADC_DIG_CTRL_ADOUT_DTS			2
 #define SUN8I_ADC_DIG_CTRL_ADOUT_DLY			1
+#define SUN8I_ADC_VOL_CTRL				0x104
+#define SUN8I_ADC_VOL_CTRL_ADCL_VOL			8
+#define SUN8I_ADC_VOL_CTRL_ADCR_VOL			0
 #define SUN8I_DAC_DIG_CTRL				0x120
 #define SUN8I_DAC_DIG_CTRL_ENDA				15
+#define SUN8I_DAC_VOL_CTRL				0x124
+#define SUN8I_DAC_VOL_CTRL_DACL_VOL			8
+#define SUN8I_DAC_VOL_CTRL_DACR_VOL			0
 #define SUN8I_DAC_MXR_SRC				0x130
 #define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_AIF1DA0L		15
 #define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_AIF1DA1L		14
@@ -521,6 +540,41 @@ static struct snd_soc_dai_driver sun8i_codec_dais[] = {
 	},
 };
 
+static const DECLARE_TLV_DB_SCALE(sun8i_codec_vol_scale, -12000, 75, 1);
+
+static const struct snd_kcontrol_new sun8i_codec_controls[] = {
+	SOC_DOUBLE_TLV("AIF1 AD0 Capture Volume",
+		       SUN8I_AIF1_VOL_CTRL1,
+		       SUN8I_AIF1_VOL_CTRL1_AD0L_VOL,
+		       SUN8I_AIF1_VOL_CTRL1_AD0R_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+	SOC_DOUBLE_TLV("AIF1 DA0 Playback Volume",
+		       SUN8I_AIF1_VOL_CTRL3,
+		       SUN8I_AIF1_VOL_CTRL3_DA0L_VOL,
+		       SUN8I_AIF1_VOL_CTRL3_DA0R_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+	SOC_DOUBLE_TLV("AIF2 ADC Capture Volume",
+		       SUN8I_AIF2_VOL_CTRL1,
+		       SUN8I_AIF2_VOL_CTRL1_ADCL_VOL,
+		       SUN8I_AIF2_VOL_CTRL1_ADCR_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+	SOC_DOUBLE_TLV("AIF2 DAC Playback Volume",
+		       SUN8I_AIF2_VOL_CTRL2,
+		       SUN8I_AIF2_VOL_CTRL2_DACL_VOL,
+		       SUN8I_AIF2_VOL_CTRL2_DACR_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+	SOC_DOUBLE_TLV("ADC Capture Volume",
+		       SUN8I_ADC_VOL_CTRL,
+		       SUN8I_ADC_VOL_CTRL_ADCL_VOL,
+		       SUN8I_ADC_VOL_CTRL_ADCR_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+	SOC_DOUBLE_TLV("DAC Playback Volume",
+		       SUN8I_DAC_VOL_CTRL,
+		       SUN8I_DAC_VOL_CTRL_DACL_VOL,
+		       SUN8I_DAC_VOL_CTRL_DACR_VOL,
+		       0xc0, 0, sun8i_codec_vol_scale),
+};
+
 static const struct snd_kcontrol_new sun8i_aif1_loopback_switch =
 	SOC_DAPM_SINGLE("AIF1 Loopback Switch",
 			SUN8I_AIF1_DACDAT_CTRL,
@@ -1017,6 +1071,8 @@ static int sun8i_codec_component_probe(struct snd_soc_component *component)
 }
 
 static const struct snd_soc_component_driver sun8i_soc_component = {
+	.controls		= sun8i_codec_controls,
+	.num_controls		= ARRAY_SIZE(sun8i_codec_controls),
 	.dapm_widgets		= sun8i_codec_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(sun8i_codec_dapm_widgets),
 	.dapm_routes		= sun8i_codec_dapm_routes,
-- 
2.24.1