linux-kernel - [PATCH 01/35] mfd: ab8500-gpadc: Implemented suspend/resume

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Date:	Fri, 15 Feb 2013 12:56:32 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	sameo@...ux.intel.com
Cc:	arnd@...db.de, linus.walleij@...ricsson.com,
	Daniel WILLERUD <daniel.willerud@...ricsson.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 01/35] mfd: ab8500-gpadc: Implemented suspend/resume

From: Daniel WILLERUD <daniel.willerud@...ricsson.com>

suspend/resume methods implemented to prevent suspend while the gpadc
driver is busy.

Signed-off-by: Daniel WILLERUD <daniel.willerud@...ricsson.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
Reviewed-by: Ulf HANSSON <ulf.hansson@...ricsson.com>
---
 drivers/mfd/ab8500-gpadc.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index b1f3561..9ed3afc 100644
--- a/drivers/mfd/ab8500-gpadc.c
+++ b/drivers/mfd/ab8500-gpadc.c
@@ -605,6 +605,31 @@ static int ab8500_gpadc_runtime_idle(struct device *dev)
 	return 0;
 }
 
+static int ab8500_gpadc_suspend(struct device *dev)
+{
+	struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+	mutex_lock(&gpadc->ab8500_gpadc_lock);
+
+	pm_runtime_get_sync(dev);
+
+	regulator_disable(gpadc->regu);
+	return 0;
+}
+
+static int ab8500_gpadc_resume(struct device *dev)
+{
+	struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+	regulator_enable(gpadc->regu);
+
+	pm_runtime_mark_last_busy(gpadc->dev);
+	pm_runtime_put_autosuspend(gpadc->dev);
+
+	mutex_unlock(&gpadc->ab8500_gpadc_lock);
+	return 0;
+}
+
 static int ab8500_gpadc_probe(struct platform_device *pdev)
 {
 	int ret = 0;
@@ -698,6 +723,9 @@ static const struct dev_pm_ops ab8500_gpadc_pm_ops = {
 	SET_RUNTIME_PM_OPS(ab8500_gpadc_runtime_suspend,
 			   ab8500_gpadc_runtime_resume,
 			   ab8500_gpadc_runtime_idle)
+	SET_SYSTEM_SLEEP_PM_OPS(ab8500_gpadc_suspend,
+				ab8500_gpadc_resume)
+
 };
 
 static struct platform_driver ab8500_gpadc_driver = {
-- 
1.7.10.4

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