drivers/mfd/max8998.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // max8998.c - mfd core driver for the Maxim 8998
 //
 //  Copyright (C) 2009-2010 Samsung Electronics
 //  Kyungmin Park <kyungmin.park@samsung.com>
 //  Marek Szyprowski <m.szyprowski@samsung.com>

 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/pm_runtime.h>
 #include <linux/mutex.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8998.h>
 #include <linux/mfd/max8998-private.h>

 #define RTC_I2C_ADDR		(0x0c >> 1)

 static const struct mfd_cell max8998_devs[] = {
 	{
 		.name = "max8998-pmic",
 	}, {
 		.name = "max8998-rtc",
 	}, {
 		.name = "max8998-battery",
 	},
 };

 static const struct mfd_cell lp3974_devs[] = {
 	{
 		.name = "lp3974-pmic",
 	}, {
 		.name = "lp3974-rtc",
 	},
 };

 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
 {
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8998->iolock);
 	ret = i2c_smbus_read_byte_data(i2c, reg);
 	mutex_unlock(&max8998->iolock);
 	if (ret < 0)
 		return ret;

 	ret &= 0xff;
 	*dest = ret;
 	return 0;
 }
 EXPORT_SYMBOL(max8998_read_reg);

 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 {
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8998->iolock);
 	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
 	mutex_unlock(&max8998->iolock);
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL(max8998_bulk_read);

 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
 {
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8998->iolock);
 	ret = i2c_smbus_write_byte_data(i2c, reg, value);
 	mutex_unlock(&max8998->iolock);
 	return ret;
 }
 EXPORT_SYMBOL(max8998_write_reg);

 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 {
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8998->iolock);
 	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 	mutex_unlock(&max8998->iolock);
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL(max8998_bulk_write);

 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 {
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8998->iolock);
 	ret = i2c_smbus_read_byte_data(i2c, reg);
 	if (ret >= 0) {
 		u8 old_val = ret & 0xff;
 		u8 new_val = (val & mask) | (old_val & (~mask));
 		ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 	}
 	mutex_unlock(&max8998->iolock);
 	return ret;
 }
 EXPORT_SYMBOL(max8998_update_reg);

 #ifdef CONFIG_OF
 static const struct of_device_id max8998_dt_match[] = {
 	{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
 	{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
 	{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
 	{},
 };
 #endif

 /*
  * Only the common platform data elements for max8998 are parsed here from the
  * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
  * to parse their own platform data elements from device tree.
  *
  * The max8998 platform data structure is instantiated here and the drivers for
  * the sub-modules need not instantiate another instance while parsing their
  * platform data.
  */
 static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
 							struct device *dev)
 {
 	struct max8998_platform_data *pd;

 	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 	if (!pd)
 		return ERR_PTR(-ENOMEM);

 	pd->ono = irq_of_parse_and_map(dev->of_node, 1);

 	/*
 	 * ToDo: the 'wakeup' member in the platform data is more of a linux
 	 * specfic information. Hence, there is no binding for that yet and
 	 * not parsed here.
 	 */
 	return pd;
 }

 static int max8998_i2c_probe(struct i2c_client *i2c)
 {
 	struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct max8998_dev *max8998;
 	int ret = 0;

 	max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
 				GFP_KERNEL);
 	if (max8998 == NULL)
 		return -ENOMEM;

 	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 		pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}

 	i2c_set_clientdata(i2c, max8998);
 	max8998->dev = &i2c->dev;
 	max8998->i2c = i2c;
 	max8998->irq = i2c->irq;
 	max8998->type = (uintptr_t)i2c_get_match_data(i2c);
 	max8998->pdata = pdata;
 	if (pdata) {
 		max8998->ono = pdata->ono;
 		max8998->irq_base = pdata->irq_base;
 		max8998->wakeup = pdata->wakeup;
 	}
 	mutex_init(&max8998->iolock);

 	max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
 	if (IS_ERR(max8998->rtc)) {
 		dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
 		return PTR_ERR(max8998->rtc);
 	}
 	i2c_set_clientdata(max8998->rtc, max8998);

 	max8998_irq_init(max8998);

 	pm_runtime_set_active(max8998->dev);

 	switch (max8998->type) {
 	case TYPE_LP3974:
 		ret = mfd_add_devices(max8998->dev, -1,
 				      lp3974_devs, ARRAY_SIZE(lp3974_devs),
 				      NULL, 0, NULL);
 		break;
 	case TYPE_MAX8998:
 		ret = mfd_add_devices(max8998->dev, -1,
 				      max8998_devs, ARRAY_SIZE(max8998_devs),
 				      NULL, 0, NULL);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	if (ret < 0)
 		goto err;

 	device_init_wakeup(max8998->dev, max8998->wakeup);

 	return ret;

 err:
 	mfd_remove_devices(max8998->dev);
 	max8998_irq_exit(max8998);
 	i2c_unregister_device(max8998->rtc);
 	return ret;
 }

 static const struct i2c_device_id max8998_i2c_id[] = {
 	{ "max8998", TYPE_MAX8998 },
 	{ "lp3974", TYPE_LP3974},
 	{ }
 };

 static int max8998_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev))
 		irq_set_irq_wake(max8998->irq, 1);
 	return 0;
 }

 static int max8998_resume(struct device *dev)
 {
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev))
 		irq_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, }
 static 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 = to_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 = to_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;
 }

 static 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",
 		   .pm = &max8998_pm,
 		   .suppress_bind_attrs = true,
 		   .of_match_table = of_match_ptr(max8998_dt_match),
 	},
 	.probe = max8998_i2c_probe,
 	.id_table = max8998_i2c_id,
 };

 static int __init max8998_i2c_init(void)
 {
 	return i2c_add_driver(&max8998_i2c_driver);
 }
 /* init early so consumer devices can complete system boot */
 subsys_initcall(max8998_i2c_init);
	// SPDX-License-Identifier: GPL-2.0+
	//
	// max8998.c - mfd core driver for the Maxim 8998
	//
	// Copyright (C) 2009-2010 Samsung Electronics
	// Kyungmin Park <kyungmin.park@samsung.com>
	// Marek Szyprowski <m.szyprowski@samsung.com>

	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/of.h>
	#include <linux/of_irq.h>
	#include <linux/pm_runtime.h>
	#include <linux/mutex.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max8998.h>
	#include <linux/mfd/max8998-private.h>

	#define RTC_I2C_ADDR (0x0c >> 1)

	static const struct mfd_cell max8998_devs[] = {
	{
	.name = "max8998-pmic",
	}, {
	.name = "max8998-rtc",
	}, {
	.name = "max8998-battery",
	},
	};

	static const struct mfd_cell lp3974_devs[] = {
	{
	.name = "lp3974-pmic",
	}, {
	.name = "lp3974-rtc",
	},
	};

	int max8998_read_reg(struct i2c_client i2c, u8 reg, u8 dest)
	{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_byte_data(i2c, reg);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
	return ret;

	ret &= 0xff;
	*dest = ret;
	return 0;
	}
	EXPORT_SYMBOL(max8998_read_reg);

	int max8998_bulk_read(struct i2c_client i2c, u8 reg, int count, u8 buf)
	{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL(max8998_bulk_read);

	int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
	{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_write_byte_data(i2c, reg, value);
	mutex_unlock(&max8998->iolock);
	return ret;
	}
	EXPORT_SYMBOL(max8998_write_reg);

	int max8998_bulk_write(struct i2c_client i2c, u8 reg, int count, u8 buf)
	{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL(max8998_bulk_write);

	int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
	{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_byte_data(i2c, reg);
	if (ret >= 0) {
	u8 old_val = ret & 0xff;
	u8 new_val = (val & mask) \| (old_val & (~mask));
	ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
	}
	mutex_unlock(&max8998->iolock);
	return ret;
	}
	EXPORT_SYMBOL(max8998_update_reg);

	#ifdef CONFIG_OF
	static const struct of_device_id max8998_dt_match[] = {
	{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
	{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
	{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
	{},
	};
	#endif

	/*
	* Only the common platform data elements for max8998 are parsed here from the
	* device tree. Other sub-modules of max8998 such as pmic, rtc and others have
	* to parse their own platform data elements from device tree.
	*
	* The max8998 platform data structure is instantiated here and the drivers for
	* the sub-modules need not instantiate another instance while parsing their
	* platform data.
	*/
	static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
	struct device *dev)
	{
	struct max8998_platform_data *pd;

	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
	if (!pd)
	return ERR_PTR(-ENOMEM);

	pd->ono = irq_of_parse_and_map(dev->of_node, 1);

	/*
	* ToDo: the 'wakeup' member in the platform data is more of a linux
	* specfic information. Hence, there is no binding for that yet and
	* not parsed here.
	*/
	return pd;
	}

	static int max8998_i2c_probe(struct i2c_client *i2c)
	{
	struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
	struct max8998_dev *max8998;
	int ret = 0;

	max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
	GFP_KERNEL);
	if (max8998 == NULL)
	return -ENOMEM;

	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
	pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	}

	i2c_set_clientdata(i2c, max8998);
	max8998->dev = &i2c->dev;
	max8998->i2c = i2c;
	max8998->irq = i2c->irq;
	max8998->type = (uintptr_t)i2c_get_match_data(i2c);
	max8998->pdata = pdata;
	if (pdata) {
	max8998->ono = pdata->ono;
	max8998->irq_base = pdata->irq_base;
	max8998->wakeup = pdata->wakeup;
	}
	mutex_init(&max8998->iolock);

	max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
	if (IS_ERR(max8998->rtc)) {
	dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
	return PTR_ERR(max8998->rtc);
	}
	i2c_set_clientdata(max8998->rtc, max8998);

	max8998_irq_init(max8998);

	pm_runtime_set_active(max8998->dev);

	switch (max8998->type) {
	case TYPE_LP3974:
	ret = mfd_add_devices(max8998->dev, -1,
	lp3974_devs, ARRAY_SIZE(lp3974_devs),
	NULL, 0, NULL);
	break;
	case TYPE_MAX8998:
	ret = mfd_add_devices(max8998->dev, -1,
	max8998_devs, ARRAY_SIZE(max8998_devs),
	NULL, 0, NULL);
	break;
	default:
	ret = -EINVAL;
	}

	if (ret < 0)
	goto err;

	device_init_wakeup(max8998->dev, max8998->wakeup);

	return ret;

	err:
	mfd_remove_devices(max8998->dev);
	max8998_irq_exit(max8998);
	i2c_unregister_device(max8998->rtc);
	return ret;
	}

	static const struct i2c_device_id max8998_i2c_id[] = {
	{ "max8998", TYPE_MAX8998 },
	{ "lp3974", TYPE_LP3974},
	{ }
	};

	static int max8998_suspend(struct device *dev)
	{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
	irq_set_irq_wake(max8998->irq, 1);
	return 0;
	}

	static int max8998_resume(struct device *dev)
	{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
	irq_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, }
	static 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 = to_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 = to_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;
	}

	static 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",
	.pm = &max8998_pm,
	.suppress_bind_attrs = true,
	.of_match_table = of_match_ptr(max8998_dt_match),
	},
	.probe = max8998_i2c_probe,
	.id_table = max8998_i2c_id,
	};

	static int __init max8998_i2c_init(void)
	{
	return i2c_add_driver(&max8998_i2c_driver);
	}
	/* init early so consumer devices can complete system boot */
	subsys_initcall(max8998_i2c_init);