extcon: arizona: Allow additional debounce during microphone detection

Help mitigate against mechanical bounce during the initial detection by
allowing the configuration of an additional debounce on top of that the
hardware does during the initial phase of microphone detection operation.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/extcon/extcon-arizona.c

@@ -64,6 +64,7 @@ struct arizona_extcon_info {
 	bool micd_clamp;
 
 	struct delayed_work hpdet_work;
+	struct delayed_work micd_detect_work;
 	struct delayed_work micd_timeout_work;
 
 	bool hpdet_active;
@@ -750,9 +751,11 @@ static void arizona_micd_timeout_work(struct work_struct *work)
 	mutex_unlock(&info->lock);
 }
 
-static irqreturn_t arizona_micdet(int irq, void *data)
+static void arizona_micd_detect(struct work_struct *work)
 {
-	struct arizona_extcon_info *info = data;
+	struct arizona_extcon_info *info = container_of(work,
+							struct arizona_extcon_info,
+							micd_detect_work.work);
 	struct arizona *arizona = info->arizona;
 	unsigned int val = 0, lvl;
 	int ret, i, key;
@@ -766,7 +769,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 		if (ret != 0) {
 			dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret);
 			mutex_unlock(&info->lock);
-			return IRQ_NONE;
+			return;
 		}
 
 		dev_dbg(arizona->dev, "MICDET: %x\n", val);
@@ -774,14 +777,14 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 		if (!(val & ARIZONA_MICD_VALID)) {
 			dev_warn(arizona->dev, "Microphone detection state invalid\n");
 			mutex_unlock(&info->lock);
-			return IRQ_NONE;
+			return;
 		}
 	}
 
 	if (i == 10 && !(val & 0x7fc)) {
 		dev_err(arizona->dev, "Failed to get valid MICDET value\n");
 		mutex_unlock(&info->lock);
-		return IRQ_NONE;
+		return;
 	}
 
 	/* Due to jack detect this should never happen */
@@ -890,6 +893,27 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 
 	pm_runtime_mark_last_busy(info->dev);
 	mutex_unlock(&info->lock);
+}
+
+static irqreturn_t arizona_micdet(int irq, void *data)
+{
+	struct arizona_extcon_info *info = data;
+	struct arizona *arizona = info->arizona;
+	int debounce = arizona->pdata.micd_detect_debounce;
+
+	cancel_delayed_work_sync(&info->micd_detect_work);
+	cancel_delayed_work_sync(&info->micd_timeout_work);
+
+	mutex_lock(&info->lock);
+	if (!info->detecting)
+		debounce = 0;
+	mutex_unlock(&info->lock);
+
+	if (debounce)
+		schedule_delayed_work(&info->micd_detect_work,
+				      msecs_to_jiffies(debounce));
+	else
+		arizona_micd_detect(&info->micd_detect_work.work);
 
 	return IRQ_HANDLED;
 }
@@ -1072,6 +1096,7 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 	info->dev = &pdev->dev;
 	info->last_jackdet = ~(ARIZONA_MICD_CLAMP_STS | ARIZONA_JD1_STS);
 	INIT_DELAYED_WORK(&info->hpdet_work, arizona_hpdet_work);
+	INIT_DELAYED_WORK(&info->micd_detect_work, arizona_micd_detect);
 	INIT_DELAYED_WORK(&info->micd_timeout_work, arizona_micd_timeout_work);
 	platform_set_drvdata(pdev, info);
 

include/linux/mfd/arizona/pdata.h

@@ -134,6 +134,9 @@ struct arizona_pdata {
 	/** GPIO used for mic isolation with HPDET */
 	int hpdet_id_gpio;
 
+	/** Extra debounce timeout used during initial mic detection (ms) */
+	int micd_detect_debounce;
+
 	/** GPIO for mic detection polarity */
 	int micd_pol_gpio;