From 4c14d78e8ad3bacfe1f70cb49ae17afcd658e368 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Wed, 6 Oct 2010 15:54:28 -0700
Subject: ASoC: Use delayed work for debounce of GPIO based jacks

Rather than block the workqueue by sleeping to do the debounce use delayed
work to implement the debounce time. This should also means that we extend
the debounce time on each new bounce, potentially allowing shorter debounce
times for clean insertions.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 493b3a4..4fb079e 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -385,7 +385,7 @@ struct snd_soc_jack_gpio {
 	int invert;
 	int debounce_time;
 	struct snd_soc_jack *jack;
-	struct work_struct work;
+	struct delayed_work work;
 
 	int (*jack_status_check)(void);
 };
diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c
index 8862770..8a0a920 100644
--- a/sound/soc/soc-jack.c
+++ b/sound/soc/soc-jack.c
@@ -188,9 +188,6 @@ static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
 	int enable;
 	int report;
 
-	if (gpio->debounce_time > 0)
-		mdelay(gpio->debounce_time);
-
 	enable = gpio_get_value(gpio->gpio);
 	if (gpio->invert)
 		enable = !enable;
@@ -211,7 +208,8 @@ static irqreturn_t gpio_handler(int irq, void *data)
 {
 	struct snd_soc_jack_gpio *gpio = data;
 
-	schedule_work(&gpio->work);
+	schedule_delayed_work(&gpio->work,
+			      msecs_to_jiffies(gpio->debounce_time));
 
 	return IRQ_HANDLED;
 }
@@ -221,7 +219,7 @@ static void gpio_work(struct work_struct *work)
 {
 	struct snd_soc_jack_gpio *gpio;
 
-	gpio = container_of(work, struct snd_soc_jack_gpio, work);
+	gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
 	snd_soc_jack_gpio_detect(gpio);
 }
 
@@ -262,7 +260,7 @@ int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 		if (ret)
 			goto err;
 
-		INIT_WORK(&gpios[i].work, gpio_work);
+		INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
 		gpios[i].jack = jack;
 
 		ret = request_irq(gpio_to_irq(gpios[i].gpio),
@@ -312,6 +310,7 @@ void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 		gpio_unexport(gpios[i].gpio);
 #endif
 		free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
+		cancel_delayed_work_sync(&gpios[i].work);
 		gpio_free(gpios[i].gpio);
 		gpios[i].jack = NULL;
 	}
-- 
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