[PATCH] extcon: adc-jack: add suspend/resume support

From: Venkat Reddy Talla
Date: Thu Jun 30 2016 - 04:55:37 EST


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@xxxxxxxxxx>
---
drivers/extcon/extcon-adc-jack.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/extcon/extcon-adc-jack.h | 2 ++
2 files changed, 36 insertions(+)

diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index 7fc0ae1..44e48aa 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,
},
};

diff --git a/include/linux/extcon/extcon-adc-jack.h b/include/linux/extcon/extcon-adc-jack.h
index 53c6080..ac85f20 100644
--- a/include/linux/extcon/extcon-adc-jack.h
+++ b/include/linux/extcon/extcon-adc-jack.h
@@ -53,6 +53,7 @@ struct adc_jack_cond {
* milli-seconds after the interrupt occurs. You may
* describe such delays with @handling_delay_ms, which
* is rounded-off by jiffies.
+ * @wakeup_source: flag to wake up the system for extcon events.
*/
struct adc_jack_pdata {
const char *name;
@@ -65,6 +66,7 @@ struct adc_jack_pdata {

unsigned long irq_flags;
unsigned long handling_delay_ms; /* in ms */
+ bool wakeup_source;
};

#endif /* _EXTCON_ADC_JACK_H */
--
2.1.4