Commit 01fdaab8 authored by MyungJoo Ham's avatar MyungJoo Ham Committed by Samuel Ortiz
Browse files

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: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 5f40c6b6

drivers/mfd/max8997.c

+26 −1
Original line number Diff line number Diff line
@@ -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 @@ static int max8997_i2c_probe(struct i2c_client *i2c, 


	max8997->irq_base = pdata->irq_base;

	max8997->ono = pdata->ono;

	max8997->wakeup = pdata->wakeup;



	mutex_init(&max8997->iolock);
@@ -169,6 +169,9 @@ static int max8997_i2c_probe(struct i2c_client *i2c, 
	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 @@ static int max8997_restore(struct device *dev) 
	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,

};

include/linux/mfd/max8997-private.h

+0 −1
Original line number Diff line number Diff line
@@ -326,7 +326,6 @@ struct max8997_dev { 
	int irq;

	int ono;

	int irq_base;

	bool wakeup;

	struct mutex irqlock;

	int irq_masks_cur[MAX8997_IRQ_GROUP_NR];

	int irq_masks_cache[MAX8997_IRQ_GROUP_NR];

CRA Git | Maintained and supported by SUSTech CRA and CCSE