ASoC: sun8i-codec: Enable AIF mono/stereo control

Each left/right pair of AIF input/output channels can be swapped or
combined. This is useful for sending a mono audio source to both sides
of a stereo sink, or for creating complex mixing scenarios.

Add the support to control this feature from userspace.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20201001021148.15852-8-samuel@sholland.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sunxi/sun8i-codec.c

@@ -54,9 +54,13 @@
 #define SUN8I_AIF1_ADCDAT_CTRL				0x044
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0L_ENA		15
 #define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_ENA		14
+#define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0L_SRC		10
+#define SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_SRC		8
 #define SUN8I_AIF1_DACDAT_CTRL				0x048
 #define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0L_ENA		15
 #define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0R_ENA		14
+#define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0L_SRC		10
+#define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0R_SRC		8
 #define SUN8I_AIF1_MXR_SRC				0x04c
 #define SUN8I_AIF1_MXR_SRC_AD0L_MXR_SRC_AIF1DA0L	15
 #define SUN8I_AIF1_MXR_SRC_AD0L_MXR_SRC_AIF2DACL	14
@@ -332,6 +336,20 @@ static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+static const char *const sun8i_aif_stereo_mux_enum_values[] = {
+	"Stereo", "Reverse Stereo", "Sum Mono", "Mix Mono"
+};
+
+static SOC_ENUM_DOUBLE_DECL(sun8i_aif1_ad0_stereo_mux_enum,
+			    SUN8I_AIF1_ADCDAT_CTRL,
+			    SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0L_SRC,
+			    SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_SRC,
+			    sun8i_aif_stereo_mux_enum_values);
+
+static const struct snd_kcontrol_new sun8i_aif1_ad0_stereo_mux_control =
+	SOC_DAPM_ENUM("AIF1 AD0 Stereo Capture Route",
+		      sun8i_aif1_ad0_stereo_mux_enum);
+
 static const struct snd_kcontrol_new sun8i_aif1_ad0_mixer_controls[] = {
 	SOC_DAPM_DOUBLE("AIF1 Slot 0 Digital ADC Capture Switch",
 			SUN8I_AIF1_MXR_SRC,
@@ -351,6 +369,16 @@ static const struct snd_kcontrol_new sun8i_aif1_ad0_mixer_controls[] = {
 			SUN8I_AIF1_MXR_SRC_AD0R_MXR_SRC_AIF2DACL, 1, 0),
 };
 
+static SOC_ENUM_DOUBLE_DECL(sun8i_aif1_da0_stereo_mux_enum,
+			    SUN8I_AIF1_DACDAT_CTRL,
+			    SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0L_SRC,
+			    SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0R_SRC,
+			    sun8i_aif_stereo_mux_enum_values);
+
+static const struct snd_kcontrol_new sun8i_aif1_da0_stereo_mux_control =
+	SOC_DAPM_ENUM("AIF1 DA0 Stereo Playback Route",
+		      sun8i_aif1_da0_stereo_mux_enum);
+
 static const struct snd_kcontrol_new sun8i_dac_mixer_controls[] = {
 	SOC_DAPM_DOUBLE("AIF1 Slot 0 Digital DAC Playback Switch",
 			SUN8I_DAC_MXR_SRC,
@@ -417,12 +445,24 @@ static const struct snd_soc_dapm_widget sun8i_codec_dapm_widgets[] = {
 			     SUN8I_AIF1_ADCDAT_CTRL,
 			     SUN8I_AIF1_ADCDAT_CTRL_AIF1_AD0R_ENA, 0),
 
+	/* AIF "ADC" Mono/Stereo Muxes */
+	SND_SOC_DAPM_MUX("AIF1 AD0L Stereo Mux", SND_SOC_NOPM, 0, 0,
+			 &sun8i_aif1_ad0_stereo_mux_control),
+	SND_SOC_DAPM_MUX("AIF1 AD0R Stereo Mux", SND_SOC_NOPM, 0, 0,
+			 &sun8i_aif1_ad0_stereo_mux_control),
+
 	/* AIF "ADC" Mixers */
 	SOC_MIXER_ARRAY("AIF1 AD0L Mixer", SND_SOC_NOPM, 0, 0,
 			sun8i_aif1_ad0_mixer_controls),
 	SOC_MIXER_ARRAY("AIF1 AD0R Mixer", SND_SOC_NOPM, 0, 0,
 			sun8i_aif1_ad0_mixer_controls),
 
+	/* AIF "DAC" Mono/Stereo Muxes */
+	SND_SOC_DAPM_MUX("AIF1 DA0L Stereo Mux", SND_SOC_NOPM, 0, 0,
+			 &sun8i_aif1_da0_stereo_mux_control),
+	SND_SOC_DAPM_MUX("AIF1 DA0R Stereo Mux", SND_SOC_NOPM, 0, 0,
+			 &sun8i_aif1_da0_stereo_mux_control),
+
 	/* AIF "DAC" Inputs */
 	SND_SOC_DAPM_AIF_IN("AIF1 DA0L", "Playback", 0,
 			    SUN8I_AIF1_DACDAT_CTRL,
@@ -473,25 +513,55 @@ static const struct snd_soc_dapm_route sun8i_codec_dapm_routes[] = {
 	{ "DACR", NULL, "DAC" },
 
 	/* AIF "ADC" Output Routes */
-	{ "AIF1 AD0L", NULL, "AIF1 AD0L Mixer" },
-	{ "AIF1 AD0R", NULL, "AIF1 AD0R Mixer" },
+	{ "AIF1 AD0L", NULL, "AIF1 AD0L Stereo Mux" },
+	{ "AIF1 AD0R", NULL, "AIF1 AD0R Stereo Mux" },
+
+	/* AIF "ADC" Mono/Stereo Mux Routes */
+	{ "AIF1 AD0L Stereo Mux", "Stereo", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0L Stereo Mux", "Reverse Stereo", "AIF1 AD0R Mixer" },
+	{ "AIF1 AD0L Stereo Mux", "Sum Mono", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0L Stereo Mux", "Sum Mono", "AIF1 AD0R Mixer" },
+	{ "AIF1 AD0L Stereo Mux", "Mix Mono", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0L Stereo Mux", "Mix Mono", "AIF1 AD0R Mixer" },
+
+	{ "AIF1 AD0R Stereo Mux", "Stereo", "AIF1 AD0R Mixer" },
+	{ "AIF1 AD0R Stereo Mux", "Reverse Stereo", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0R Stereo Mux", "Sum Mono", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0R Stereo Mux", "Sum Mono", "AIF1 AD0R Mixer" },
+	{ "AIF1 AD0R Stereo Mux", "Mix Mono", "AIF1 AD0L Mixer" },
+	{ "AIF1 AD0R Stereo Mux", "Mix Mono", "AIF1 AD0R Mixer" },
 
 	/* AIF "ADC" Mixer Routes */
-	{ "AIF1 AD0L Mixer", "AIF1 Slot 0 Digital ADC Capture Switch", "AIF1 DA0L" },
+	{ "AIF1 AD0L Mixer", "AIF1 Slot 0 Digital ADC Capture Switch", "AIF1 DA0L Stereo Mux" },
 	{ "AIF1 AD0L Mixer", "AIF1 Data Digital ADC Capture Switch", "ADCL" },
 
-	{ "AIF1 AD0R Mixer", "AIF1 Slot 0 Digital ADC Capture Switch", "AIF1 DA0R" },
+	{ "AIF1 AD0R Mixer", "AIF1 Slot 0 Digital ADC Capture Switch", "AIF1 DA0R Stereo Mux" },
 	{ "AIF1 AD0R Mixer", "AIF1 Data Digital ADC Capture Switch", "ADCR" },
 
+	/* AIF "DAC" Mono/Stereo Mux Routes */
+	{ "AIF1 DA0L Stereo Mux", "Stereo", "AIF1 DA0L" },
+	{ "AIF1 DA0L Stereo Mux", "Reverse Stereo", "AIF1 DA0R" },
+	{ "AIF1 DA0L Stereo Mux", "Sum Mono", "AIF1 DA0L" },
+	{ "AIF1 DA0L Stereo Mux", "Sum Mono", "AIF1 DA0R" },
+	{ "AIF1 DA0L Stereo Mux", "Mix Mono", "AIF1 DA0L" },
+	{ "AIF1 DA0L Stereo Mux", "Mix Mono", "AIF1 DA0R" },
+
+	{ "AIF1 DA0R Stereo Mux", "Stereo", "AIF1 DA0R" },
+	{ "AIF1 DA0R Stereo Mux", "Reverse Stereo", "AIF1 DA0L" },
+	{ "AIF1 DA0R Stereo Mux", "Sum Mono", "AIF1 DA0L" },
+	{ "AIF1 DA0R Stereo Mux", "Sum Mono", "AIF1 DA0R" },
+	{ "AIF1 DA0R Stereo Mux", "Mix Mono", "AIF1 DA0L" },
+	{ "AIF1 DA0R Stereo Mux", "Mix Mono", "AIF1 DA0R" },
+
 	/* DAC Output Routes */
 	{ "DACL", NULL, "DACL Mixer" },
 	{ "DACR", NULL, "DACR Mixer" },
 
 	/* DAC Mixer Routes */
-	{ "DACL Mixer", "AIF1 Slot 0 Digital DAC Playback Switch", "AIF1 DA0L" },
+	{ "DACL Mixer", "AIF1 Slot 0 Digital DAC Playback Switch", "AIF1 DA0L Stereo Mux" },
 	{ "DACL Mixer", "ADC Digital DAC Playback Switch", "ADCL" },
 
-	{ "DACR Mixer", "AIF1 Slot 0 Digital DAC Playback Switch", "AIF1 DA0R" },
+	{ "DACR Mixer", "AIF1 Slot 0 Digital DAC Playback Switch", "AIF1 DA0R Stereo Mux" },
 	{ "DACR Mixer", "ADC Digital DAC Playback Switch", "ADCR" },
 };