drivers/mfd/max8997.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // max8997.c - mfd core driver for the Maxim 8966 and 8997
 //
 // Copyright (C) 2011 Samsung Electronics
 // MyungJoo Ham <myungjoo.ham@samsung.com>
 //
 // This driver is based on max8998.c

 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/interrupt.h>
 #include <linux/pm_runtime.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8997.h>
 #include <linux/mfd/max8997-private.h>

 #define I2C_ADDR_PMIC	(0xCC >> 1)
 #define I2C_ADDR_MUIC	(0x4A >> 1)
 #define I2C_ADDR_BATTERY	(0x6C >> 1)
 #define I2C_ADDR_RTC	(0x0C >> 1)
 #define I2C_ADDR_HAPTIC	(0x90 >> 1)

 static const struct mfd_cell max8997_devs[] = {
 	{ .name = "max8997-pmic", },
 	{ .name = "max8997-rtc", },
 	{ .name = "max8997-battery", .of_compatible = "maxim,max8997-battery", },
 	{ .name = "max8997-haptic", },
 	{ .name = "max8997-muic", .of_compatible = "maxim,max8997-muic", },
 	{ .name = "max8997-led", .id = 1 },
 	{ .name = "max8997-led", .id = 2 },
 };

 #ifdef CONFIG_OF
 static const struct of_device_id max8997_pmic_dt_match[] = {
 	{ .compatible = "maxim,max8997-pmic", .data = (void *)TYPE_MAX8997 },
 	{},
 };
 #endif

 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
 {
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8997->iolock);
 	ret = i2c_smbus_read_byte_data(i2c, reg);
 	mutex_unlock(&max8997->iolock);
 	if (ret < 0)
 		return ret;

 	ret &= 0xff;
 	*dest = ret;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(max8997_read_reg);

 int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 {
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8997->iolock);
 	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
 	mutex_unlock(&max8997->iolock);
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(max8997_bulk_read);

 int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
 {
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8997->iolock);
 	ret = i2c_smbus_write_byte_data(i2c, reg, value);
 	mutex_unlock(&max8997->iolock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(max8997_write_reg);

 int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 {
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8997->iolock);
 	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 	mutex_unlock(&max8997->iolock);
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(max8997_bulk_write);

 int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 {
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int ret;

 	mutex_lock(&max8997->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(&max8997->iolock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(max8997_update_reg);

 /*
  * Only the common platform data elements for max8997 are parsed here from the
  * device tree. Other sub-modules of max8997 such as pmic, rtc and others have
  * to parse their own platform data elements from device tree.
  *
  * The max8997 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 max8997_platform_data *max8997_i2c_parse_dt_pdata(
 					struct device *dev)
 {
 	struct max8997_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);

 	return pd;
 }

 static inline unsigned long max8997_i2c_get_driver_data(struct i2c_client *i2c,
 						const struct i2c_device_id *id)
 {
 	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
 		return (unsigned long)match->data;
 	}
 	return id->driver_data;
 }

 static int max8997_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct max8997_dev *max8997;
 	struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	int ret = 0;

 	max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev),
 				GFP_KERNEL);
 	if (max8997 == NULL)
 		return -ENOMEM;

 	i2c_set_clientdata(i2c, max8997);
 	max8997->dev = &i2c->dev;
 	max8997->i2c = i2c;
 	max8997->type = max8997_i2c_get_driver_data(i2c, id);
 	max8997->irq = i2c->irq;

 	if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) {
 		pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}

 	if (!pdata)
 		return ret;

 	max8997->pdata = pdata;
 	max8997->ono = pdata->ono;

 	mutex_init(&max8997->iolock);

 	max8997->rtc = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_RTC);
 	if (IS_ERR(max8997->rtc)) {
 		dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n");
 		return PTR_ERR(max8997->rtc);
 	}
 	i2c_set_clientdata(max8997->rtc, max8997);

 	max8997->haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC);
 	if (IS_ERR(max8997->haptic)) {
 		dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n");
 		ret = PTR_ERR(max8997->haptic);
 		goto err_i2c_haptic;
 	}
 	i2c_set_clientdata(max8997->haptic, max8997);

 	max8997->muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC);
 	if (IS_ERR(max8997->muic)) {
 		dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n");
 		ret = PTR_ERR(max8997->muic);
 		goto err_i2c_muic;
 	}
 	i2c_set_clientdata(max8997->muic, max8997);

 	pm_runtime_set_active(max8997->dev);

 	max8997_irq_init(max8997);

 	ret = mfd_add_devices(max8997->dev, -1, max8997_devs,
 			ARRAY_SIZE(max8997_devs),
 			NULL, 0, NULL);
 	if (ret < 0) {
 		dev_err(max8997->dev, "failed to add MFD devices %d\n", ret);
 		goto err_mfd;
 	}

 	/*
 	 * TODO: enable others (flash, muic, rtc, battery, ...) and
 	 * check the return value
 	 */

 	/* MAX8997 has a power button input. */
 	device_init_wakeup(max8997->dev, true);

 	return ret;

 err_mfd:
 	mfd_remove_devices(max8997->dev);
 	i2c_unregister_device(max8997->muic);
 err_i2c_muic:
 	i2c_unregister_device(max8997->haptic);
 err_i2c_haptic:
 	i2c_unregister_device(max8997->rtc);
 	return ret;
 }

 static const struct i2c_device_id max8997_i2c_id[] = {
 	{ "max8997", TYPE_MAX8997 },
 	{ "max8966", TYPE_MAX8966 },
 	{ }
 };

 static u8 max8997_dumpaddr_pmic[] = {
 	MAX8997_REG_INT1MSK,
 	MAX8997_REG_INT2MSK,
 	MAX8997_REG_INT3MSK,
 	MAX8997_REG_INT4MSK,
 	MAX8997_REG_MAINCON1,
 	MAX8997_REG_MAINCON2,
 	MAX8997_REG_BUCKRAMP,
 	MAX8997_REG_BUCK1CTRL,
 	MAX8997_REG_BUCK1DVS1,
 	MAX8997_REG_BUCK1DVS2,
 	MAX8997_REG_BUCK1DVS3,
 	MAX8997_REG_BUCK1DVS4,
 	MAX8997_REG_BUCK1DVS5,
 	MAX8997_REG_BUCK1DVS6,
 	MAX8997_REG_BUCK1DVS7,
 	MAX8997_REG_BUCK1DVS8,
 	MAX8997_REG_BUCK2CTRL,
 	MAX8997_REG_BUCK2DVS1,
 	MAX8997_REG_BUCK2DVS2,
 	MAX8997_REG_BUCK2DVS3,
 	MAX8997_REG_BUCK2DVS4,
 	MAX8997_REG_BUCK2DVS5,
 	MAX8997_REG_BUCK2DVS6,
 	MAX8997_REG_BUCK2DVS7,
 	MAX8997_REG_BUCK2DVS8,
 	MAX8997_REG_BUCK3CTRL,
 	MAX8997_REG_BUCK3DVS,
 	MAX8997_REG_BUCK4CTRL,
 	MAX8997_REG_BUCK4DVS,
 	MAX8997_REG_BUCK5CTRL,
 	MAX8997_REG_BUCK5DVS1,
 	MAX8997_REG_BUCK5DVS2,
 	MAX8997_REG_BUCK5DVS3,
 	MAX8997_REG_BUCK5DVS4,
 	MAX8997_REG_BUCK5DVS5,
 	MAX8997_REG_BUCK5DVS6,
 	MAX8997_REG_BUCK5DVS7,
 	MAX8997_REG_BUCK5DVS8,
 	MAX8997_REG_BUCK6CTRL,
 	MAX8997_REG_BUCK6BPSKIPCTRL,
 	MAX8997_REG_BUCK7CTRL,
 	MAX8997_REG_BUCK7DVS,
 	MAX8997_REG_LDO1CTRL,
 	MAX8997_REG_LDO2CTRL,
 	MAX8997_REG_LDO3CTRL,
 	MAX8997_REG_LDO4CTRL,
 	MAX8997_REG_LDO5CTRL,
 	MAX8997_REG_LDO6CTRL,
 	MAX8997_REG_LDO7CTRL,
 	MAX8997_REG_LDO8CTRL,
 	MAX8997_REG_LDO9CTRL,
 	MAX8997_REG_LDO10CTRL,
 	MAX8997_REG_LDO11CTRL,
 	MAX8997_REG_LDO12CTRL,
 	MAX8997_REG_LDO13CTRL,
 	MAX8997_REG_LDO14CTRL,
 	MAX8997_REG_LDO15CTRL,
 	MAX8997_REG_LDO16CTRL,
 	MAX8997_REG_LDO17CTRL,
 	MAX8997_REG_LDO18CTRL,
 	MAX8997_REG_LDO21CTRL,
 	MAX8997_REG_MBCCTRL1,
 	MAX8997_REG_MBCCTRL2,
 	MAX8997_REG_MBCCTRL3,
 	MAX8997_REG_MBCCTRL4,
 	MAX8997_REG_MBCCTRL5,
 	MAX8997_REG_MBCCTRL6,
 	MAX8997_REG_OTPCGHCVS,
 	MAX8997_REG_SAFEOUTCTRL,
 	MAX8997_REG_LBCNFG1,
 	MAX8997_REG_LBCNFG2,
 	MAX8997_REG_BBCCTRL,

 	MAX8997_REG_FLASH1_CUR,
 	MAX8997_REG_FLASH2_CUR,
 	MAX8997_REG_MOVIE_CUR,
 	MAX8997_REG_GSMB_CUR,
 	MAX8997_REG_BOOST_CNTL,
 	MAX8997_REG_LEN_CNTL,
 	MAX8997_REG_FLASH_CNTL,
 	MAX8997_REG_WDT_CNTL,
 	MAX8997_REG_MAXFLASH1,
 	MAX8997_REG_MAXFLASH2,
 	MAX8997_REG_FLASHSTATUSMASK,

 	MAX8997_REG_GPIOCNTL1,
 	MAX8997_REG_GPIOCNTL2,
 	MAX8997_REG_GPIOCNTL3,
 	MAX8997_REG_GPIOCNTL4,
 	MAX8997_REG_GPIOCNTL5,
 	MAX8997_REG_GPIOCNTL6,
 	MAX8997_REG_GPIOCNTL7,
 	MAX8997_REG_GPIOCNTL8,
 	MAX8997_REG_GPIOCNTL9,
 	MAX8997_REG_GPIOCNTL10,
 	MAX8997_REG_GPIOCNTL11,
 	MAX8997_REG_GPIOCNTL12,

 	MAX8997_REG_LDO1CONFIG,
 	MAX8997_REG_LDO2CONFIG,
 	MAX8997_REG_LDO3CONFIG,
 	MAX8997_REG_LDO4CONFIG,
 	MAX8997_REG_LDO5CONFIG,
 	MAX8997_REG_LDO6CONFIG,
 	MAX8997_REG_LDO7CONFIG,
 	MAX8997_REG_LDO8CONFIG,
 	MAX8997_REG_LDO9CONFIG,
 	MAX8997_REG_LDO10CONFIG,
 	MAX8997_REG_LDO11CONFIG,
 	MAX8997_REG_LDO12CONFIG,
 	MAX8997_REG_LDO13CONFIG,
 	MAX8997_REG_LDO14CONFIG,
 	MAX8997_REG_LDO15CONFIG,
 	MAX8997_REG_LDO16CONFIG,
 	MAX8997_REG_LDO17CONFIG,
 	MAX8997_REG_LDO18CONFIG,
 	MAX8997_REG_LDO21CONFIG,

 	MAX8997_REG_DVSOKTIMER1,
 	MAX8997_REG_DVSOKTIMER2,
 	MAX8997_REG_DVSOKTIMER4,
 	MAX8997_REG_DVSOKTIMER5,
 };

 static u8 max8997_dumpaddr_muic[] = {
 	MAX8997_MUIC_REG_INTMASK1,
 	MAX8997_MUIC_REG_INTMASK2,
 	MAX8997_MUIC_REG_INTMASK3,
 	MAX8997_MUIC_REG_CDETCTRL,
 	MAX8997_MUIC_REG_CONTROL1,
 	MAX8997_MUIC_REG_CONTROL2,
 	MAX8997_MUIC_REG_CONTROL3,
 };

 static u8 max8997_dumpaddr_haptic[] = {
 	MAX8997_HAPTIC_REG_CONF1,
 	MAX8997_HAPTIC_REG_CONF2,
 	MAX8997_HAPTIC_REG_DRVCONF,
 	MAX8997_HAPTIC_REG_CYCLECONF1,
 	MAX8997_HAPTIC_REG_CYCLECONF2,
 	MAX8997_HAPTIC_REG_SIGCONF1,
 	MAX8997_HAPTIC_REG_SIGCONF2,
 	MAX8997_HAPTIC_REG_SIGCONF3,
 	MAX8997_HAPTIC_REG_SIGCONF4,
 	MAX8997_HAPTIC_REG_SIGDC1,
 	MAX8997_HAPTIC_REG_SIGDC2,
 	MAX8997_HAPTIC_REG_SIGPWMDC1,
 	MAX8997_HAPTIC_REG_SIGPWMDC2,
 	MAX8997_HAPTIC_REG_SIGPWMDC3,
 	MAX8997_HAPTIC_REG_SIGPWMDC4,
 };

 static int max8997_freeze(struct device *dev)
 {
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 		max8997_read_reg(i2c, max8997_dumpaddr_pmic[i],
 				&max8997->reg_dump[i]);

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 		max8997_read_reg(i2c, max8997_dumpaddr_muic[i],
 				&max8997->reg_dump[i + MAX8997_REG_PMIC_END]);

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 		max8997_read_reg(i2c, max8997_dumpaddr_haptic[i],
 				&max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 				MAX8997_MUIC_REG_END]);

 	return 0;
 }

 static int max8997_restore(struct device *dev)
 {
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
 		max8997_write_reg(i2c, max8997_dumpaddr_pmic[i],
 				max8997->reg_dump[i]);

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
 		max8997_write_reg(i2c, max8997_dumpaddr_muic[i],
 				max8997->reg_dump[i + MAX8997_REG_PMIC_END]);

 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
 		max8997_write_reg(i2c, max8997_dumpaddr_haptic[i],
 				max8997->reg_dump[i + MAX8997_REG_PMIC_END +
 				MAX8997_MUIC_REG_END]);

 	return 0;
 }

 static int max8997_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);

 	disable_irq(max8997->irq);
 	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 = to_i2c_client(dev);
 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev))
 		irq_set_irq_wake(max8997->irq, 0);
 	enable_irq(max8997->irq);
 	return max8997_irq_resume(max8997);
 }

 static const struct dev_pm_ops max8997_pm = {
 	.suspend = max8997_suspend,
 	.resume = max8997_resume,
 	.freeze = max8997_freeze,
 	.restore = max8997_restore,
 };

 static struct i2c_driver max8997_i2c_driver = {
 	.driver = {
 		   .name = "max8997",
 		   .pm = &max8997_pm,
 		   .suppress_bind_attrs = true,
 		   .of_match_table = of_match_ptr(max8997_pmic_dt_match),
 	},
 	.probe = max8997_i2c_probe,
 	.id_table = max8997_i2c_id,
 };

 static int __init max8997_i2c_init(void)
 {
 	return i2c_add_driver(&max8997_i2c_driver);
 }
 /* init early so consumer devices can complete system boot */
 subsys_initcall(max8997_i2c_init);
	// SPDX-License-Identifier: GPL-2.0+
	//
	// max8997.c - mfd core driver for the Maxim 8966 and 8997
	//
	// Copyright (C) 2011 Samsung Electronics
	// MyungJoo Ham <myungjoo.ham@samsung.com>
	//
	// This driver is based on max8998.c

	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/of.h>
	#include <linux/of_irq.h>
	#include <linux/interrupt.h>
	#include <linux/pm_runtime.h>
	#include <linux/init.h>
	#include <linux/mutex.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max8997.h>
	#include <linux/mfd/max8997-private.h>

	#define I2C_ADDR_PMIC (0xCC >> 1)
	#define I2C_ADDR_MUIC (0x4A >> 1)
	#define I2C_ADDR_BATTERY (0x6C >> 1)
	#define I2C_ADDR_RTC (0x0C >> 1)
	#define I2C_ADDR_HAPTIC (0x90 >> 1)

	static const struct mfd_cell max8997_devs[] = {
	{ .name = "max8997-pmic", },
	{ .name = "max8997-rtc", },
	{ .name = "max8997-battery", .of_compatible = "maxim,max8997-battery", },
	{ .name = "max8997-haptic", },
	{ .name = "max8997-muic", .of_compatible = "maxim,max8997-muic", },
	{ .name = "max8997-led", .id = 1 },
	{ .name = "max8997-led", .id = 2 },
	};

	#ifdef CONFIG_OF
	static const struct of_device_id max8997_pmic_dt_match[] = {
	{ .compatible = "maxim,max8997-pmic", .data = (void *)TYPE_MAX8997 },
	{},
	};
	#endif

	int max8997_read_reg(struct i2c_client i2c, u8 reg, u8 dest)
	{
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8997->iolock);
	ret = i2c_smbus_read_byte_data(i2c, reg);
	mutex_unlock(&max8997->iolock);
	if (ret < 0)
	return ret;

	ret &= 0xff;
	*dest = ret;
	return 0;
	}
	EXPORT_SYMBOL_GPL(max8997_read_reg);

	int max8997_bulk_read(struct i2c_client i2c, u8 reg, int count, u8 buf)
	{
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8997->iolock);
	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8997->iolock);
	if (ret < 0)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL_GPL(max8997_bulk_read);

	int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
	{
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8997->iolock);
	ret = i2c_smbus_write_byte_data(i2c, reg, value);
	mutex_unlock(&max8997->iolock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(max8997_write_reg);

	int max8997_bulk_write(struct i2c_client i2c, u8 reg, int count, u8 buf)
	{
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8997->iolock);
	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8997->iolock);
	if (ret < 0)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL_GPL(max8997_bulk_write);

	int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
	{
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8997->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(&max8997->iolock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(max8997_update_reg);

	/*
	* Only the common platform data elements for max8997 are parsed here from the
	* device tree. Other sub-modules of max8997 such as pmic, rtc and others have
	* to parse their own platform data elements from device tree.
	*
	* The max8997 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 max8997_platform_data *max8997_i2c_parse_dt_pdata(
	struct device *dev)
	{
	struct max8997_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);

	return pd;
	}

	static inline unsigned long max8997_i2c_get_driver_data(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
	const struct of_device_id *match;
	match = of_match_node(max8997_pmic_dt_match, i2c->dev.of_node);
	return (unsigned long)match->data;
	}
	return id->driver_data;
	}

	static int max8997_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct max8997_dev *max8997;
	struct max8997_platform_data *pdata = dev_get_platdata(&i2c->dev);
	int ret = 0;

	max8997 = devm_kzalloc(&i2c->dev, sizeof(struct max8997_dev),
	GFP_KERNEL);
	if (max8997 == NULL)
	return -ENOMEM;

	i2c_set_clientdata(i2c, max8997);
	max8997->dev = &i2c->dev;
	max8997->i2c = i2c;
	max8997->type = max8997_i2c_get_driver_data(i2c, id);
	max8997->irq = i2c->irq;

	if (IS_ENABLED(CONFIG_OF) && max8997->dev->of_node) {
	pdata = max8997_i2c_parse_dt_pdata(max8997->dev);
	if (IS_ERR(pdata))
	return PTR_ERR(pdata);
	}

	if (!pdata)
	return ret;

	max8997->pdata = pdata;
	max8997->ono = pdata->ono;

	mutex_init(&max8997->iolock);

	max8997->rtc = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_RTC);
	if (IS_ERR(max8997->rtc)) {
	dev_err(max8997->dev, "Failed to allocate I2C device for RTC\n");
	return PTR_ERR(max8997->rtc);
	}
	i2c_set_clientdata(max8997->rtc, max8997);

	max8997->haptic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_HAPTIC);
	if (IS_ERR(max8997->haptic)) {
	dev_err(max8997->dev, "Failed to allocate I2C device for Haptic\n");
	ret = PTR_ERR(max8997->haptic);
	goto err_i2c_haptic;
	}
	i2c_set_clientdata(max8997->haptic, max8997);

	max8997->muic = i2c_new_dummy_device(i2c->adapter, I2C_ADDR_MUIC);
	if (IS_ERR(max8997->muic)) {
	dev_err(max8997->dev, "Failed to allocate I2C device for MUIC\n");
	ret = PTR_ERR(max8997->muic);
	goto err_i2c_muic;
	}
	i2c_set_clientdata(max8997->muic, max8997);

	pm_runtime_set_active(max8997->dev);

	max8997_irq_init(max8997);

	ret = mfd_add_devices(max8997->dev, -1, max8997_devs,
	ARRAY_SIZE(max8997_devs),
	NULL, 0, NULL);
	if (ret < 0) {
	dev_err(max8997->dev, "failed to add MFD devices %d\n", ret);
	goto err_mfd;
	}

	/*
	* TODO: enable others (flash, muic, rtc, battery, ...) and
	* check the return value
	*/

	/* MAX8997 has a power button input. */
	device_init_wakeup(max8997->dev, true);

	return ret;

	err_mfd:
	mfd_remove_devices(max8997->dev);
	i2c_unregister_device(max8997->muic);
	err_i2c_muic:
	i2c_unregister_device(max8997->haptic);
	err_i2c_haptic:
	i2c_unregister_device(max8997->rtc);
	return ret;
	}

	static const struct i2c_device_id max8997_i2c_id[] = {
	{ "max8997", TYPE_MAX8997 },
	{ "max8966", TYPE_MAX8966 },
	{ }
	};

	static u8 max8997_dumpaddr_pmic[] = {
	MAX8997_REG_INT1MSK,
	MAX8997_REG_INT2MSK,
	MAX8997_REG_INT3MSK,
	MAX8997_REG_INT4MSK,
	MAX8997_REG_MAINCON1,
	MAX8997_REG_MAINCON2,
	MAX8997_REG_BUCKRAMP,
	MAX8997_REG_BUCK1CTRL,
	MAX8997_REG_BUCK1DVS1,
	MAX8997_REG_BUCK1DVS2,
	MAX8997_REG_BUCK1DVS3,
	MAX8997_REG_BUCK1DVS4,
	MAX8997_REG_BUCK1DVS5,
	MAX8997_REG_BUCK1DVS6,
	MAX8997_REG_BUCK1DVS7,
	MAX8997_REG_BUCK1DVS8,
	MAX8997_REG_BUCK2CTRL,
	MAX8997_REG_BUCK2DVS1,
	MAX8997_REG_BUCK2DVS2,
	MAX8997_REG_BUCK2DVS3,
	MAX8997_REG_BUCK2DVS4,
	MAX8997_REG_BUCK2DVS5,
	MAX8997_REG_BUCK2DVS6,
	MAX8997_REG_BUCK2DVS7,
	MAX8997_REG_BUCK2DVS8,
	MAX8997_REG_BUCK3CTRL,
	MAX8997_REG_BUCK3DVS,
	MAX8997_REG_BUCK4CTRL,
	MAX8997_REG_BUCK4DVS,
	MAX8997_REG_BUCK5CTRL,
	MAX8997_REG_BUCK5DVS1,
	MAX8997_REG_BUCK5DVS2,
	MAX8997_REG_BUCK5DVS3,
	MAX8997_REG_BUCK5DVS4,
	MAX8997_REG_BUCK5DVS5,
	MAX8997_REG_BUCK5DVS6,
	MAX8997_REG_BUCK5DVS7,
	MAX8997_REG_BUCK5DVS8,
	MAX8997_REG_BUCK6CTRL,
	MAX8997_REG_BUCK6BPSKIPCTRL,
	MAX8997_REG_BUCK7CTRL,
	MAX8997_REG_BUCK7DVS,
	MAX8997_REG_LDO1CTRL,
	MAX8997_REG_LDO2CTRL,
	MAX8997_REG_LDO3CTRL,
	MAX8997_REG_LDO4CTRL,
	MAX8997_REG_LDO5CTRL,
	MAX8997_REG_LDO6CTRL,
	MAX8997_REG_LDO7CTRL,
	MAX8997_REG_LDO8CTRL,
	MAX8997_REG_LDO9CTRL,
	MAX8997_REG_LDO10CTRL,
	MAX8997_REG_LDO11CTRL,
	MAX8997_REG_LDO12CTRL,
	MAX8997_REG_LDO13CTRL,
	MAX8997_REG_LDO14CTRL,
	MAX8997_REG_LDO15CTRL,
	MAX8997_REG_LDO16CTRL,
	MAX8997_REG_LDO17CTRL,
	MAX8997_REG_LDO18CTRL,
	MAX8997_REG_LDO21CTRL,
	MAX8997_REG_MBCCTRL1,
	MAX8997_REG_MBCCTRL2,
	MAX8997_REG_MBCCTRL3,
	MAX8997_REG_MBCCTRL4,
	MAX8997_REG_MBCCTRL5,
	MAX8997_REG_MBCCTRL6,
	MAX8997_REG_OTPCGHCVS,
	MAX8997_REG_SAFEOUTCTRL,
	MAX8997_REG_LBCNFG1,
	MAX8997_REG_LBCNFG2,
	MAX8997_REG_BBCCTRL,

	MAX8997_REG_FLASH1_CUR,
	MAX8997_REG_FLASH2_CUR,
	MAX8997_REG_MOVIE_CUR,
	MAX8997_REG_GSMB_CUR,
	MAX8997_REG_BOOST_CNTL,
	MAX8997_REG_LEN_CNTL,
	MAX8997_REG_FLASH_CNTL,
	MAX8997_REG_WDT_CNTL,
	MAX8997_REG_MAXFLASH1,
	MAX8997_REG_MAXFLASH2,
	MAX8997_REG_FLASHSTATUSMASK,

	MAX8997_REG_GPIOCNTL1,
	MAX8997_REG_GPIOCNTL2,
	MAX8997_REG_GPIOCNTL3,
	MAX8997_REG_GPIOCNTL4,
	MAX8997_REG_GPIOCNTL5,
	MAX8997_REG_GPIOCNTL6,
	MAX8997_REG_GPIOCNTL7,
	MAX8997_REG_GPIOCNTL8,
	MAX8997_REG_GPIOCNTL9,
	MAX8997_REG_GPIOCNTL10,
	MAX8997_REG_GPIOCNTL11,
	MAX8997_REG_GPIOCNTL12,

	MAX8997_REG_LDO1CONFIG,
	MAX8997_REG_LDO2CONFIG,
	MAX8997_REG_LDO3CONFIG,
	MAX8997_REG_LDO4CONFIG,
	MAX8997_REG_LDO5CONFIG,
	MAX8997_REG_LDO6CONFIG,
	MAX8997_REG_LDO7CONFIG,
	MAX8997_REG_LDO8CONFIG,
	MAX8997_REG_LDO9CONFIG,
	MAX8997_REG_LDO10CONFIG,
	MAX8997_REG_LDO11CONFIG,
	MAX8997_REG_LDO12CONFIG,
	MAX8997_REG_LDO13CONFIG,
	MAX8997_REG_LDO14CONFIG,
	MAX8997_REG_LDO15CONFIG,
	MAX8997_REG_LDO16CONFIG,
	MAX8997_REG_LDO17CONFIG,
	MAX8997_REG_LDO18CONFIG,
	MAX8997_REG_LDO21CONFIG,

	MAX8997_REG_DVSOKTIMER1,
	MAX8997_REG_DVSOKTIMER2,
	MAX8997_REG_DVSOKTIMER4,
	MAX8997_REG_DVSOKTIMER5,
	};

	static u8 max8997_dumpaddr_muic[] = {
	MAX8997_MUIC_REG_INTMASK1,
	MAX8997_MUIC_REG_INTMASK2,
	MAX8997_MUIC_REG_INTMASK3,
	MAX8997_MUIC_REG_CDETCTRL,
	MAX8997_MUIC_REG_CONTROL1,
	MAX8997_MUIC_REG_CONTROL2,
	MAX8997_MUIC_REG_CONTROL3,
	};

	static u8 max8997_dumpaddr_haptic[] = {
	MAX8997_HAPTIC_REG_CONF1,
	MAX8997_HAPTIC_REG_CONF2,
	MAX8997_HAPTIC_REG_DRVCONF,
	MAX8997_HAPTIC_REG_CYCLECONF1,
	MAX8997_HAPTIC_REG_CYCLECONF2,
	MAX8997_HAPTIC_REG_SIGCONF1,
	MAX8997_HAPTIC_REG_SIGCONF2,
	MAX8997_HAPTIC_REG_SIGCONF3,
	MAX8997_HAPTIC_REG_SIGCONF4,
	MAX8997_HAPTIC_REG_SIGDC1,
	MAX8997_HAPTIC_REG_SIGDC2,
	MAX8997_HAPTIC_REG_SIGPWMDC1,
	MAX8997_HAPTIC_REG_SIGPWMDC2,
	MAX8997_HAPTIC_REG_SIGPWMDC3,
	MAX8997_HAPTIC_REG_SIGPWMDC4,
	};

	static int max8997_freeze(struct device *dev)
	{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int i;

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
	max8997_read_reg(i2c, max8997_dumpaddr_pmic[i],
	&max8997->reg_dump[i]);

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
	max8997_read_reg(i2c, max8997_dumpaddr_muic[i],
	&max8997->reg_dump[i + MAX8997_REG_PMIC_END]);

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
	max8997_read_reg(i2c, max8997_dumpaddr_haptic[i],
	&max8997->reg_dump[i + MAX8997_REG_PMIC_END +
	MAX8997_MUIC_REG_END]);

	return 0;
	}

	static int max8997_restore(struct device *dev)
	{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
	int i;

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
	max8997_write_reg(i2c, max8997_dumpaddr_pmic[i],
	max8997->reg_dump[i]);

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
	max8997_write_reg(i2c, max8997_dumpaddr_muic[i],
	max8997->reg_dump[i + MAX8997_REG_PMIC_END]);

	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
	max8997_write_reg(i2c, max8997_dumpaddr_haptic[i],
	max8997->reg_dump[i + MAX8997_REG_PMIC_END +
	MAX8997_MUIC_REG_END]);

	return 0;
	}

	static int max8997_suspend(struct device *dev)
	{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);

	disable_irq(max8997->irq);
	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 = to_i2c_client(dev);
	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
	irq_set_irq_wake(max8997->irq, 0);
	enable_irq(max8997->irq);
	return max8997_irq_resume(max8997);
	}

	static const struct dev_pm_ops max8997_pm = {
	.suspend = max8997_suspend,
	.resume = max8997_resume,
	.freeze = max8997_freeze,
	.restore = max8997_restore,
	};

	static struct i2c_driver max8997_i2c_driver = {
	.driver = {
	.name = "max8997",
	.pm = &max8997_pm,
	.suppress_bind_attrs = true,
	.of_match_table = of_match_ptr(max8997_pmic_dt_match),
	},
	.probe = max8997_i2c_probe,
	.id_table = max8997_i2c_id,
	};

	static int __init max8997_i2c_init(void)
	{
	return i2c_add_driver(&max8997_i2c_driver);
	}
	/* init early so consumer devices can complete system boot */
	subsys_initcall(max8997_i2c_init);