extcon: adc-jack: add suspend/resume support

adding suspend and resume funtionality for extcon-adc-jack
driver to configure system wake up for extcon events,
also adding support to enable/disable system wakeup
through flag wakeup_source based on platform requirement.

Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index 7fc0ae1912f8..44e48aa78a84 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -38,6 +38,7 @@
  * @chan:               iio channel being queried.
  */
 struct adc_jack_data {
+        struct device *dev;
         struct extcon_dev *edev;
 
         const unsigned int **cable_names;
@@ -49,6 +50,7 @@ struct adc_jack_data {
         struct delayed_work handler;
 
         struct iio_channel *chan;
+        bool wakeup_source;
 };
 
 static void adc_jack_handler(struct work_struct *work)
@@ -105,6 +107,7 @@ static int adc_jack_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
+        data->dev = &pdev->dev;
         data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
         if (IS_ERR(data->edev)) {
                 dev_err(&pdev->dev, "failed to allocate extcon device\n");
@@ -128,6 +131,7 @@ static int adc_jack_probe(struct platform_device *pdev)
                 return PTR_ERR(data->chan);
 
         data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
+        data->wakeup_source = pdata->wakeup_source;
 
         INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
 
@@ -151,6 +155,9 @@ static int adc_jack_probe(struct platform_device *pdev)
                 return err;
         }
 
+        if (data->wakeup_source)
+                device_init_wakeup(&pdev->dev, 1);
+
         return 0;
 }
 
@@ -165,11 +172,38 @@ static int adc_jack_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int adc_jack_suspend(struct device *dev)
+{
+        struct adc_jack_data *data = dev_get_drvdata(dev);
+
+        cancel_delayed_work_sync(&data->handler);
+        if (device_may_wakeup(data->dev))
+                enable_irq_wake(data->irq);
+
+        return 0;
+}
+
+static int adc_jack_resume(struct device *dev)
+{
+        struct adc_jack_data *data = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(data->dev))
+                disable_irq_wake(data->irq);
+
+        return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
+                adc_jack_suspend, adc_jack_resume);
+
 static struct platform_driver adc_jack_driver = {
         .probe          = adc_jack_probe,
         .remove         = adc_jack_remove,
         .driver         = {
                 .name   = "adc-jack",
+                .pm = &adc_jack_pm_ops,
         },
 };