ASoC: sgtl5000: add 'Audio Switch' block implementation

Add mux for choosing DAC source: ADC, I2S or DAP. DAP - digital
audio processing block. Moreover create choosing mux for DAP main
source (ADC or I2S) and DAP mixer source (ADC or I2S). Mixer block
allows summing DAP main and mixer sources togheter with defined
volumes.

Signed-off-by: Michal Oleszczyk <oleszczyk.m@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sgtl5000.c

@@ -216,17 +216,54 @@ static SOC_ENUM_SINGLE_DECL(adc_enum,
 static const struct snd_kcontrol_new adc_mux =
 SOC_DAPM_ENUM("Capture Mux", adc_enum);
 
-/* input sources for DAC */
-static const char *dac_mux_text[] = {
+/* input sources for headphone */
+static const char *hp_mux_text[] = {
 	"DAC", "LINE_IN"
 };
 
-static SOC_ENUM_SINGLE_DECL(dac_enum,
+static SOC_ENUM_SINGLE_DECL(hp_enum,
 			    SGTL5000_CHIP_ANA_CTRL, 6,
+			    hp_mux_text);
+
+static const struct snd_kcontrol_new hp_mux =
+SOC_DAPM_ENUM("Headphone Mux", hp_enum);
+
+/* input sources for DAC */
+static const char *dac_mux_text[] = {
+	"ADC", "I2S", "Rsvrd", "DAP"
+};
+
+static SOC_ENUM_SINGLE_DECL(dac_enum,
+			    SGTL5000_CHIP_SSS_CTRL, SGTL5000_DAC_SEL_SHIFT,
 			    dac_mux_text);
 
 static const struct snd_kcontrol_new dac_mux =
-SOC_DAPM_ENUM("Headphone Mux", dac_enum);
+SOC_DAPM_ENUM("Digital Input Mux", dac_enum);
+
+/* input sources for DAP */
+static const char *dap_mux_text[] = {
+	"ADC", "I2S"
+};
+
+static SOC_ENUM_SINGLE_DECL(dap_enum,
+			    SGTL5000_CHIP_SSS_CTRL, SGTL5000_DAP_SEL_SHIFT,
+			    dap_mux_text);
+
+static const struct snd_kcontrol_new dap_mux =
+SOC_DAPM_ENUM("DAP Mux", dap_enum);
+
+/* input sources for DAP mix */
+static const char *dapmix_mux_text[] = {
+	"ADC", "I2S"
+};
+
+static SOC_ENUM_SINGLE_DECL(dapmix_enum,
+			    SGTL5000_CHIP_SSS_CTRL, SGTL5000_DAP_MIX_SEL_SHIFT,
+			    dapmix_mux_text);
+
+static const struct snd_kcontrol_new dapmix_mux =
+SOC_DAPM_ENUM("DAP MIX Mux", dapmix_enum);
+
 
 static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("LINE_IN"),
@@ -243,7 +280,12 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = {
 	SND_SOC_DAPM_PGA("LO", SGTL5000_CHIP_ANA_POWER, 0, 0, NULL, 0),
 
 	SND_SOC_DAPM_MUX("Capture Mux", SND_SOC_NOPM, 0, 0, &adc_mux),
-	SND_SOC_DAPM_MUX("Headphone Mux", SND_SOC_NOPM, 0, 0, &dac_mux),
+	SND_SOC_DAPM_MUX("Headphone Mux", SND_SOC_NOPM, 0, 0, &hp_mux),
+	SND_SOC_DAPM_MUX("Digital Input Mux", SND_SOC_NOPM, 0, 0, &dac_mux),
+	SND_SOC_DAPM_MUX("DAP Mux", SGTL5000_DAP_CTRL, 0, 0, &dap_mux),
+	SND_SOC_DAPM_MUX("DAP MIX Mux", SGTL5000_DAP_CTRL, 4, 0, &dapmix_mux),
+	SND_SOC_DAPM_MIXER("DAP", SGTL5000_CHIP_DIG_POWER, 4, 0, NULL, 0),
+
 
 	/* aif for i2s input */
 	SND_SOC_DAPM_AIF_IN("AIFIN", "Playback",
@@ -270,7 +312,19 @@ static const struct snd_soc_dapm_route sgtl5000_dapm_routes[] = {
 	{"ADC", NULL, "Capture Mux"},		/* adc_mux --> adc */
 	{"AIFOUT", NULL, "ADC"},		/* adc --> i2s_out */
 
-	{"DAC", NULL, "AIFIN"},			/* i2s-->dac,skip audio mux */
+	{"DAP Mux", "ADC", "ADC"},		/* adc --> DAP mux */
+	{"DAP Mux", NULL, "AIFIN"},		/* i2s --> DAP mux */
+	{"DAP", NULL, "DAP Mux"},		/* DAP mux --> dap */
+
+	{"DAP MIX Mux", "ADC", "ADC"},		/* adc --> DAP MIX mux */
+	{"DAP MIX Mux", NULL, "AIFIN"},		/* i2s --> DAP MIX mux */
+	{"DAP", NULL, "DAP MIX Mux"},		/* DAP MIX mux --> dap */
+
+	{"Digital Input Mux", "ADC", "ADC"},	/* adc --> audio mux */
+	{"Digital Input Mux", NULL, "AIFIN"},	/* i2s --> audio mux */
+	{"Digital Input Mux", NULL, "DAP"},	/* dap --> audio mux */
+	{"DAC", NULL, "Digital Input Mux"},	/* audio mux --> dac */
+
 	{"Headphone Mux", "DAC", "DAC"},	/* dac --> hp_mux */
 	{"LO", NULL, "DAC"},			/* dac --> line_out */
 
@@ -463,6 +517,9 @@ static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
 	1, 3, TLV_DB_SCALE_ITEM(2000, 1000, 0)
 );
 
+/* tlv for DAP channels, 0% - 100% - 200% */
+static const DECLARE_TLV_DB_SCALE(dap_volume, 0, 1, 0);
+
 /* tlv for hp volume, -51.5db to 12.0db, step .5db */
 static const DECLARE_TLV_DB_SCALE(headphone_volume, -5150, 50, 0);
 
@@ -514,6 +571,11 @@ static const struct snd_kcontrol_new sgtl5000_snd_controls[] = {
 			lineout_volume),
 	SOC_SINGLE("Lineout Playback Switch", SGTL5000_CHIP_ANA_CTRL, 8, 1, 1),
 
+	SOC_SINGLE_TLV("DAP Main channel", SGTL5000_DAP_MAIN_CHAN,
+	0, 0xffff, 0, dap_volume),
+
+	SOC_SINGLE_TLV("DAP Mix channel", SGTL5000_DAP_MIX_CHAN,
+	0, 0xffff, 0, dap_volume),
 	/* Automatic Volume Control (DAP AVC) */
 	SOC_SINGLE("AVC Switch", SGTL5000_DAP_AVC_CTRL, 0, 1, 0),
 	SOC_SINGLE("AVC Hard Limiter Switch", SGTL5000_DAP_AVC_CTRL, 5, 1, 0),
@@ -1217,12 +1279,6 @@ static int sgtl5000_probe(struct snd_soc_component *component)
 	/* disable short cut detector */
 	snd_soc_component_write(component, SGTL5000_CHIP_SHORT_CTRL, 0);
 
-	/*
-	 * set i2s as default input of sound switch
-	 * TODO: add sound switch to control and dapm widge.
-	 */
-	snd_soc_component_write(component, SGTL5000_CHIP_SSS_CTRL,
-			SGTL5000_DAC_SEL_I2S_IN << SGTL5000_DAC_SEL_SHIFT);
 	snd_soc_component_write(component, SGTL5000_CHIP_DIG_POWER,
 			SGTL5000_ADC_EN | SGTL5000_DAC_EN);