mfd: Wake-up from Suspend MAX8997 support
- Support wake-up from suspend-to-ram.
- Handle pending interrupt after a resume.
- If pdata->wakeup is enabled, by default, the device is assumed to be
capable of wakeup (the interrupt pin is connected to a wakeup-source GPIO)
and may wakeup the system (MAX8997 has a power button input pin).
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c
index f83103b..dc58750 100644
--- a/drivers/mfd/max8997.c
+++ b/drivers/mfd/max8997.c
@@ -23,6 +23,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
@@ -142,7 +143,6 @@
max8997->irq_base = pdata->irq_base;
max8997->ono = pdata->ono;
- max8997->wakeup = pdata->wakeup;
mutex_init(&max8997->iolock);
@@ -169,6 +169,9 @@
if (ret < 0)
goto err_mfd;
+ /* MAX8997 has a power button input. */
+ device_init_wakeup(max8997->dev, pdata->wakeup);
+
return ret;
err_mfd:
@@ -398,7 +401,29 @@
return 0;
}
+static int max8997_suspend(struct device *dev)
+{
+ struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+ struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
+
+ if (device_may_wakeup(dev))
+ irq_set_irq_wake(max8997->irq, 1);
+ return 0;
+}
+
+static int max8997_resume(struct device *dev)
+{
+ struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+ struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
+
+ if (device_may_wakeup(dev))
+ irq_set_irq_wake(max8997->irq, 0);
+ return max8997_irq_resume(max8997);
+}
+
const struct dev_pm_ops max8997_pm = {
+ .suspend = max8997_suspend,
+ .resume = max8997_resume,
.freeze = max8997_freeze,
.restore = max8997_restore,
};