Having two DMICs, a front DMIC and a rear DMIC,
but only host audio input AUX port0 is used for these two Dmics.
A "dmic_sel-gpios" property is used for a mixer control to switch
the dmic signal source between the Front and Rear Dmic.
usage: amixer -c0 cset name='Dmic Mux' 'FrontMic'
usage: amixer -c0 cset name='Dmic Mux' 'RearMic'
Refer to this one as an example,
commit 3cfbf07c6d27
("ASoC: qcom: sc7180: Modify machine driver for 2mic")
Signed-off-by: Ajye Huang <ajye_huang@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/dmic.c | 52 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index 4fd6f97e5a49..5c56fbcdb3e6 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -28,8 +28,50 @@ struct dmic {
int wakeup_delay;
/* Delay after DMIC mode switch */
int modeswitch_delay;
+ struct gpio_desc *dmic_sel;
+ int dmic_switch;
};
+static int dmic_sel_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
+ struct snd_soc_component *component = snd_soc_dapm_to_component(dapm);
+ struct dmic *dmic = snd_soc_component_get_drvdata(component);
+
+ ucontrol->value.integer.value[0] = dmic->dmic_switch;
+ return 0;
+}
+
+static int dmic_sel_set(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
+ struct snd_soc_component *component = snd_soc_dapm_to_component(dapm);
+ struct dmic *dmic = snd_soc_component_get_drvdata(component);
+
+ dmic->dmic_switch = ucontrol->value.integer.value[0];
+ if (dmic->dmic_sel) {
+ gpiod_set_value(dmic->dmic_sel, dmic->dmic_switch);
+ dev_info(dapm->dev, "%s value %d\n", __func__, dmic->dmic_switch);
+ } else
+ dev_info(dapm->dev, "%s without dmic_sel-gpios\n", __func__);
+
+ return 0;
+}
+
+static const char * const dmic_mux_text[] = {
+ "FrontMic",
+ "RearMic",
+};
+
+static SOC_ENUM_SINGLE_DECL(dmic_enum,
+ SND_SOC_NOPM, 0, dmic_mux_text);
+
+static const struct snd_kcontrol_new dmic_mux_control =
+ SOC_DAPM_ENUM_EXT("DMIC Select Mux", dmic_enum,
+ dmic_sel_get, dmic_sel_set);
+
static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
@@ -115,6 +157,11 @@ static int dmic_component_probe(struct snd_soc_component *component)
if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY)
dmic->modeswitch_delay = MAX_MODESWITCH_DELAY;
+ dmic->dmic_sel = devm_gpiod_get_optional(component->dev,
+ "dmic_sel", GPIOD_OUT_LOW);
+ if (IS_ERR(dmic->dmic_sel))
+ return PTR_ERR(dmic->dmic_sel);
+
snd_soc_component_set_drvdata(component, dmic);
return 0;
@@ -125,10 +172,15 @@ static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
SND_SOC_NOPM, 0, 0, dmic_aif_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_INPUT("DMic"),
+ SND_SOC_DAPM_MIC("DMIC", NULL),
+ SND_SOC_DAPM_MUX("Dmic Mux", SND_SOC_NOPM, 0, 0, &dmic_mux_control),
};
static const struct snd_soc_dapm_route intercon[] = {
{"DMIC AIF", NULL, "DMic"},
+ /* digital mics */
+ {"Dmic Mux", "FrontMic", "DMIC"},
+ {"Dmic Mux", "RearMic", "DMIC"},
};
static const struct snd_soc_component_driver soc_dmic = {
--
2.25.1
