mfd: ab8500-gpadc: Implemented suspend/resume

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

Signed-off-by: Daniel WILLERUD <daniel.willerud@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Reviewed-by: Ulf HANSSON <ulf.hansson@stericsson.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index b1f3561b023f..9ed3afc31d11 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 = {