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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>
This commit is contained in:
MyungJoo Ham 2011-08-19 14:39:40 +09:00 committed by Samuel Ortiz
parent 5f40c6b650
commit 01fdaab8ff
2 changed files with 26 additions and 2 deletions
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27
drivers/mfd/max8997.c
View File

@ -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,
};

1
include/linux/mfd/max8997-private.h
View File

@ -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];