[PATCH] wm8962: add a simple DMIC enable control

[Charles Keepax]

On Wed, Feb 02, 2022 at 11:17:34AM +0100, Martin Kepplinger wrote:
> Am Mittwoch, dem 02.02.2022 um 09:53 +0000 schrieb Charles Keepax:
> > On Tue, Feb 01, 2022 at 04:01:13PM +0100, Martin Kepplinger wrote:
> Do you have a code example from a different codec that has roughly what
> is missing here? (the sound subsystem is new to me)

Full disclosure this is complete untested, but it should be
pretty close. Let me know if it does the trick and I will send a
proper patch to the list. I do have a Librem 5 in a draw
somewhere so can pull that out if we get really stuck, but that
might have to wait until the weekend :-).

I don't know if you guys are using the analogue bypass paths
around the digital core on the chip. I think those will still
work with the mics set to digital, so I have left the routes as
is, but that might require some checking at some point.

Thanks,
Charles


diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
index a5584ba962dcf..2c41d31956aa8 100644
--- a/sound/soc/codecs/wm8962.c
+++ b/sound/soc/codecs/wm8962.c
@@ -2049,6 +2049,13 @@ static SOC_ENUM_SINGLE_DECL(hpoutl_enum,
 static const struct snd_kcontrol_new hpoutl_mux =
 	SOC_DAPM_ENUM("HPOUTL Mux", hpoutl_enum);
 
+static const char * const input_mode_text[] = { "Analog", "Digital" };
+
+static SOC_ENUM_SINGLE_VIRT_DECL(input_mode_enum, input_mode_text);
+
+static const struct snd_kcontrol_new input_mode_mux =
+	SOC_DAPM_ENUM("Input Mode", input_mode_enum);
+
 static const struct snd_kcontrol_new inpgal[] = {
 SOC_DAPM_SINGLE("IN1L Switch", WM8962_LEFT_INPUT_PGA_CONTROL, 3, 1, 0),
 SOC_DAPM_SINGLE("IN2L Switch", WM8962_LEFT_INPUT_PGA_CONTROL, 2, 1, 0),
@@ -2147,6 +2154,9 @@ SND_SOC_DAPM_MIXER("MIXINR", WM8962_PWR_MGMT_1, 4, 0,
 
 SND_SOC_DAPM_AIF_IN("DMIC_ENA", NULL, 0, WM8962_PWR_MGMT_1, 10, 0),
 
+SND_SOC_DAPM_MUX("Input Mode L", SND_SOC_NOPM, 0, 0, &input_mode_mux),
+SND_SOC_DAPM_MUX("Input Mode R", SND_SOC_NOPM, 0, 0, &input_mode_mux),
+
 SND_SOC_DAPM_ADC("ADCL", "Capture", WM8962_PWR_MGMT_1, 3, 0),
 SND_SOC_DAPM_ADC("ADCR", "Capture", WM8962_PWR_MGMT_1, 2, 0),
 
@@ -2226,16 +2236,19 @@ static const struct snd_soc_dapm_route wm8962_intercon[] = {
 
 	{ "DMIC_ENA", NULL, "DMICDAT" },
 
+	{ "Input Mode L", "Analog", "MIXINL" },
+	{ "Input Mode L", "Digital", "DMIC_ENA" },
+	{ "Input Mode R", "Analog", "MIXINR" },
+	{ "Input Mode R", "Digital", "DMIC_ENA" },
+
 	{ "ADCL", NULL, "SYSCLK" },
 	{ "ADCL", NULL, "TOCLK" },
-	{ "ADCL", NULL, "MIXINL" },
-	{ "ADCL", NULL, "DMIC_ENA" },
+	{ "ADCL", NULL, "Input Mode L" },
 	{ "ADCL", NULL, "DSP2" },
 
 	{ "ADCR", NULL, "SYSCLK" },
 	{ "ADCR", NULL, "TOCLK" },
-	{ "ADCR", NULL, "MIXINR" },
-	{ "ADCR", NULL, "DMIC_ENA" },
+	{ "ADCR", NULL, "Input Mode R" },
 	{ "ADCR", NULL, "DSP2" },
 
 	{ "STL", "Left", "ADCL" },
-- 
2.11.0