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mfd: MAX8998/LP3974 hibernation support
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This patch makes the driver to save and restore register values
for hibernation.

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>
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MyungJoo Ham authored and Samuel Ortiz committed Jan 14, 2011
1 parent 6680d94 commit cdd137c
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Showing 4 changed files with 118 additions and 0 deletions.
7 changes: 7 additions & 0 deletions drivers/mfd/max8998-irq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,13 @@ static irqreturn_t max8998_irq_thread(int irq, void *data)
return IRQ_HANDLED;
}

int max8998_irq_resume(struct max8998_dev *max8998)
{
if (max8998->irq && max8998->irq_base)
max8998_irq_thread(max8998->irq_base, max8998);
return 0;
}

int max8998_irq_init(struct max8998_dev *max8998)
{
int i;
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108 changes: 108 additions & 0 deletions drivers/mfd/max8998.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@
#include <linux/init.h>
#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>
#include <linux/mfd/max8998.h>
Expand Down Expand Up @@ -135,6 +137,7 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
if (pdata) {
max8998->ono = pdata->ono;
max8998->irq_base = pdata->irq_base;
max8998->wakeup = pdata->wakeup;
}
mutex_init(&max8998->iolock);

Expand All @@ -146,6 +149,8 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0);
pm_runtime_set_active(max8998->dev);

if (ret < 0)
goto err;

Expand Down Expand Up @@ -178,10 +183,113 @@ static const struct i2c_device_id max8998_i2c_id[] = {
};
MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);

static int max8998_suspend(struct device *dev)
{
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

if (max8998->wakeup)
set_irq_wake(max8998->irq, 1);
return 0;
}

static int max8998_resume(struct device *dev)
{
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

if (max8998->wakeup)
set_irq_wake(max8998->irq, 0);
/*
* In LP3974, if IRQ registers are not "read & clear"
* when it's set during sleep, the interrupt becomes
* disabled.
*/
return max8998_irq_resume(i2c_get_clientdata(i2c));
}

struct max8998_reg_dump {
u8 addr;
u8 val;
};
#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
struct max8998_reg_dump max8998_dump[] = {
SAVE_ITEM(MAX8998_REG_IRQM1),
SAVE_ITEM(MAX8998_REG_IRQM2),
SAVE_ITEM(MAX8998_REG_IRQM3),
SAVE_ITEM(MAX8998_REG_IRQM4),
SAVE_ITEM(MAX8998_REG_STATUSM1),
SAVE_ITEM(MAX8998_REG_STATUSM2),
SAVE_ITEM(MAX8998_REG_CHGR1),
SAVE_ITEM(MAX8998_REG_CHGR2),
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
SAVE_ITEM(MAX8998_REG_ONOFF1),
SAVE_ITEM(MAX8998_REG_ONOFF2),
SAVE_ITEM(MAX8998_REG_ONOFF3),
SAVE_ITEM(MAX8998_REG_ONOFF4),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
SAVE_ITEM(MAX8998_REG_LDO4),
SAVE_ITEM(MAX8998_REG_LDO5),
SAVE_ITEM(MAX8998_REG_LDO6),
SAVE_ITEM(MAX8998_REG_LDO7),
SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
SAVE_ITEM(MAX8998_REG_LDO12),
SAVE_ITEM(MAX8998_REG_LDO13),
SAVE_ITEM(MAX8998_REG_LDO14),
SAVE_ITEM(MAX8998_REG_LDO15),
SAVE_ITEM(MAX8998_REG_LDO16),
SAVE_ITEM(MAX8998_REG_LDO17),
SAVE_ITEM(MAX8998_REG_BKCHR),
SAVE_ITEM(MAX8998_REG_LBCNFG1),
SAVE_ITEM(MAX8998_REG_LBCNFG2),
};
/* Save registers before hibernation */
static int max8998_freeze(struct device *dev)
{
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
int i;

for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
max8998_read_reg(i2c, max8998_dump[i].addr,
&max8998_dump[i].val);

return 0;
}

/* Restore registers after hibernation */
static int max8998_restore(struct device *dev)
{
struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
int i;

for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
max8998_write_reg(i2c, max8998_dump[i].addr,
max8998_dump[i].val);

return 0;
}

const struct dev_pm_ops max8998_pm = {
.suspend = max8998_suspend,
.resume = max8998_resume,
.freeze = max8998_freeze,
.restore = max8998_restore,
};

static struct i2c_driver max8998_i2c_driver = {
.driver = {
.name = "max8998",
.owner = THIS_MODULE,
.pm = &max8998_pm,
},
.probe = max8998_i2c_probe,
.remove = max8998_i2c_remove,
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2 changes: 2 additions & 0 deletions include/linux/mfd/max8998-private.h
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Original file line number Diff line number Diff line change
Expand Up @@ -159,10 +159,12 @@ struct max8998_dev {
u8 irq_masks_cur[MAX8998_NUM_IRQ_REGS];
u8 irq_masks_cache[MAX8998_NUM_IRQ_REGS];
int type;
bool wakeup;
};

int max8998_irq_init(struct max8998_dev *max8998);
void max8998_irq_exit(struct max8998_dev *max8998);
int max8998_irq_resume(struct max8998_dev *max8998);

extern int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
extern int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count,
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1 change: 1 addition & 0 deletions include/linux/mfd/max8998.h
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,7 @@ struct max8998_platform_data {
int buck1_set1;
int buck1_set2;
int buck2_set3;
bool wakeup;
};

#endif /* __LINUX_MFD_MAX8998_H */

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