ASoC: max9867: add digital microphone controls

MAX9867 codec has a possibility of connecting digital microphones.
Add DAPM controls to be able to enable them.
Signed-off-by: Pavel Dobias <dobias@2n.cz>
Link: https://lore.kernel.org/r/20200522142957.18364-2-dobias@2n.czSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max9867.c

@@ -104,10 +104,24 @@ static const struct snd_kcontrol_new max9867_line_out_control =
 	SOC_DAPM_DOUBLE_R("Switch",
 			  MAX9867_LEFTVOL, MAX9867_RIGHTVOL, 6, 1, 1);
 
+/* DMIC mux */
+static const char *const dmic_mux_text[] = {
+	"ADC", "DMIC"
+};
+static SOC_ENUM_SINGLE_DECL(left_dmic_mux_enum,
+			    MAX9867_MICCONFIG, 5, dmic_mux_text);
+static SOC_ENUM_SINGLE_DECL(right_dmic_mux_enum,
+			    MAX9867_MICCONFIG, 4, dmic_mux_text);
+static const struct snd_kcontrol_new max9867_left_dmic_mux =
+	SOC_DAPM_ENUM("DMICL Mux", left_dmic_mux_enum);
+static const struct snd_kcontrol_new max9867_right_dmic_mux =
+	SOC_DAPM_ENUM("DMICR Mux", right_dmic_mux_enum);
 
 static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("MICL"),
 	SND_SOC_DAPM_INPUT("MICR"),
+	SND_SOC_DAPM_INPUT("DMICL"),
+	SND_SOC_DAPM_INPUT("DMICR"),
 	SND_SOC_DAPM_INPUT("LINL"),
 	SND_SOC_DAPM_INPUT("LINR"),
 
@@ -116,6 +130,10 @@ static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
 	SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
 				     max9867_input_mixer_controls,
 				     ARRAY_SIZE(max9867_input_mixer_controls)),
+	SND_SOC_DAPM_MUX("DMICL Mux", SND_SOC_NOPM, 0, 0,
+			 &max9867_left_dmic_mux),
+	SND_SOC_DAPM_MUX("DMICR Mux", SND_SOC_NOPM, 0, 0,
+			 &max9867_right_dmic_mux),
 	SND_SOC_DAPM_ADC("ADCL", "HiFi Capture", MAX9867_PWRMAN, 1, 0),
 	SND_SOC_DAPM_ADC("ADCR", "HiFi Capture", MAX9867_PWRMAN, 0, 0),
 
@@ -140,8 +158,12 @@ static const struct snd_soc_dapm_route max9867_audio_map[] = {
 	{"Input Mixer", "Mic Capture Switch", "MICR"},
 	{"Input Mixer", "Line Capture Switch", "Left Line Input"},
 	{"Input Mixer", "Line Capture Switch", "Right Line Input"},
-	{"ADCL", NULL, "Input Mixer"},
-	{"ADCR", NULL, "Input Mixer"},
+	{"DMICL Mux", "DMIC", "DMICL"},
+	{"DMICR Mux", "DMIC", "DMICR"},
+	{"DMICL Mux", "ADC", "Input Mixer"},
+	{"DMICR Mux", "ADC", "Input Mixer"},
+	{"ADCL", NULL, "DMICL Mux"},
+	{"ADCR", NULL, "DMICR Mux"},
 
 	{"Digital", "Sidetone Switch", "ADCL"},
 	{"Digital", "Sidetone Switch", "ADCR"},