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Commit cdd137c9 authored by MyungJoo Ham's avatar MyungJoo Ham Committed by Samuel Ortiz
Browse files

mfd: MAX8998/LP3974 hibernation support 



This patch makes the driver to save and restore register values
for hibernation.

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 6680d940

drivers/mfd/max8998-irq.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

drivers/mfd/max8998.c

+108 −0
Original line number Diff line number Diff line
@@ -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>
@@ -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);
@@ -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;
@@ -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,

include/linux/mfd/max8998-private.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

include/linux/mfd/max8998.h

+1 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ struct max8998_platform_data { 
	int				buck1_set1;

	int				buck1_set2;

	int				buck2_set3;

	bool				wakeup;

};



#endif /*  __LINUX_MFD_MAX8998_H */