ASoC: wm8994: Add debounce to wm8994 mic detection

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 22 insertions, 7 deletions

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 98e462cbec73..54512880e191 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3059,22 +3059,20 @@ int wm8994_mic_detect(struct snd_soc_codec *codec, struct snd_soc_jack *jack,
 }
 EXPORT_SYMBOL_GPL(wm8994_mic_detect);
 
-static irqreturn_t wm8994_mic_irq(int irq, void *data)
+static void wm8994_mic_work(struct work_struct *work)
 {
-        struct wm8994_priv *priv = data;
+        struct wm8994_priv *priv = container_of(work,
+                                                struct wm8994_priv,
+                                                mic_work.work);
         struct snd_soc_codec *codec = priv->codec;
         int reg;
         int report;
 
-#ifndef CONFIG_SND_SOC_WM8994_MODULE
-        trace_snd_soc_jack_irq(dev_name(codec->dev));
-#endif
-
         reg = snd_soc_read(codec, WM8994_INTERRUPT_RAW_STATUS_2);
         if (reg < 0) {
                 dev_err(codec->dev, "Failed to read microphone status: %d\n",
                         reg);
-                return IRQ_HANDLED;
+                return;
         }
 
         dev_dbg(codec->dev, "Microphone status: %x\n", reg);
@@ -3116,6 +3114,20 @@ static irqreturn_t wm8994_mic_irq(int irq, void *data)
 
         snd_soc_jack_report(priv->micdet[1].jack, report,
                             SND_JACK_HEADSET | SND_JACK_BTN_0);
+}
+
+static irqreturn_t wm8994_mic_irq(int irq, void *data)
+{
+        struct wm8994_priv *priv = data;
+        struct snd_soc_codec *codec = priv->codec;
+
+#ifndef CONFIG_SND_SOC_WM8994_MODULE
+        trace_snd_soc_jack_irq(dev_name(codec->dev));
+#endif
+
+        pm_wakeup_event(codec->dev, 300);
+
+        schedule_delayed_work(&priv->mic_work, msecs_to_jiffies(250));
 
         return IRQ_HANDLED;
 }
@@ -3488,6 +3500,7 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
         wm8994->codec = codec;
 
         mutex_init(&wm8994->accdet_lock);
+        INIT_DELAYED_WORK(&wm8994->mic_work, wm8994_mic_work);
 
         for (i = 0; i < ARRAY_SIZE(wm8994->fll_locked); i++)
                 init_completion(&wm8994->fll_locked[i]);
diff --git a/sound/soc/codecs/wm8994.h b/sound/soc/codecs/wm8994.h
index 91650bba205e..d77e06f0a675 100644
--- a/sound/soc/codecs/wm8994.h
+++ b/sound/soc/codecs/wm8994.h
@@ -12,6 +12,7 @@
 #include <sound/soc.h>
 #include <linux/firmware.h>
 #include <linux/completion.h>
+#include <linux/workqueue.h>
 
 #include "wm_hubs.h"
 
@@ -127,6 +128,7 @@ struct wm8994_priv {
 
         struct mutex accdet_lock;
         struct wm8994_micdet micdet[2];
+        struct delayed_work mic_work;
         bool mic_detecting;
         bool jack_mic;
         int btn_mask;