[PATCH 1/2] ASoC: codec: use enable pin to control dmic start and stop

[Lin Huang]

on some board use enable pin to control dmic start and stop,
so add this feature in dmic driver.

Signed-off-by: Lin Huang <hl@xxxxxxxxxxxxxx>
---
 sound/soc/codecs/Kconfig |  2 +-
 sound/soc/codecs/dmic.c  | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index ccc5814..dff3586 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -61,7 +61,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_DA7219 if I2C
 	select SND_SOC_DA732X if I2C
 	select SND_SOC_DA9055 if I2C
-	select SND_SOC_DMIC
+	select SND_SOC_DMIC if GPIOLIB
 	select SND_SOC_BT_SCO
 	select SND_SOC_ES8328_SPI if SPI_MASTER
 	select SND_SOC_ES8328_I2C if I2C
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index 32b7a48..c4e5f47 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -19,6 +19,8 @@
  *
  */
 
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -27,6 +29,39 @@
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 
+struct dmic_priv {
+	struct gpio_desc *dmic_en;
+};
+
+static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
+		int cmd, struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct dmic_priv *dmic_data = snd_soc_codec_get_drvdata(codec);
+
+	if (!dmic_data->dmic_en)
+		return 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		gpiod_set_value(dmic_data->dmic_en, 1);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		gpiod_set_value(dmic_data->dmic_en, 0);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops dmic_dai_ops = {
+	.trigger	= dmic_daiops_trigger,
+};
+
 static struct snd_soc_dai_driver dmic_dai = {
 	.name = "dmic-hifi",
 	.capture = {
@@ -38,8 +73,24 @@ static struct snd_soc_dai_driver dmic_dai = {
 			| SNDRV_PCM_FMTBIT_S24_LE
 			| SNDRV_PCM_FMTBIT_S16_LE,
 	},
+	.ops    = &dmic_dai_ops,
 };
 
+static int dmic_codec_probe(struct snd_soc_codec *codec)
+{
+	struct dmic_priv *dmic_data = snd_soc_codec_get_drvdata(codec);
+
+	dmic_data->dmic_en = devm_gpiod_get_optional(codec->dev,
+						"dmicen", GPIOD_OUT_LOW);
+
+	if (IS_ERR(dmic_data->dmic_en))
+		return PTR_ERR(dmic_data->dmic_en);
+
+	snd_soc_codec_set_drvdata(codec, dmic_data);
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
 	SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
 			     SND_SOC_NOPM, 0, 0),
@@ -51,6 +102,7 @@ static const struct snd_soc_dapm_route intercon[] = {
 };
 
 static struct snd_soc_codec_driver soc_dmic = {
+	.probe = dmic_codec_probe,
 	.dapm_widgets = dmic_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
 	.dapm_routes = intercon,
@@ -59,6 +111,15 @@ static struct snd_soc_codec_driver soc_dmic = {
 
 static int dmic_dev_probe(struct platform_device *pdev)
 {
+	struct dmic_priv *dmic_data;
+
+	dmic_data = devm_kzalloc(&pdev->dev, sizeof(*dmic_data), GFP_KERNEL);
+
+	if (!dmic_data)
+		return -ENOMEM;
+
+	dev_set_drvdata(&pdev->dev, dmic_data);
+
 	return snd_soc_register_codec(&pdev->dev,
 			&soc_dmic, &dmic_dai, 1);
 }
-- 
2.7.4