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

Signed-off-by: Lin Huang <h...@rock-chips.com>
---
 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

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