drivers/mfd/sec-core.c - kernel/bruno - Git at Google

 /*
  * sec-core.c
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd
  *              http://www.samsung.com
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #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/mutex.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/samsung/core.h>
 #include <linux/mfd/samsung/irq.h>
 #include <linux/mfd/samsung/s2mpa01.h>
 #include <linux/mfd/samsung/s2mps11.h>
 #include <linux/mfd/samsung/s2mps13.h>
 #include <linux/mfd/samsung/s2mps14.h>
 #include <linux/mfd/samsung/s2mpu02.h>
 #include <linux/mfd/samsung/s5m8763.h>
 #include <linux/mfd/samsung/s5m8767.h>
 #include <linux/regmap.h>

 static const struct mfd_cell s5m8751_devs[] = {
 	{
 		.name = "s5m8751-pmic",
 	}, {
 		.name = "s5m-charger",
 	}, {
 		.name = "s5m8751-codec",
 	},
 };

 static const struct mfd_cell s5m8763_devs[] = {
 	{
 		.name = "s5m8763-pmic",
 	}, {
 		.name = "s5m-rtc",
 	}, {
 		.name = "s5m-charger",
 	},
 };

 static const struct mfd_cell s5m8767_devs[] = {
 	{
 		.name = "s5m8767-pmic",
 	}, {
 		.name = "s5m-rtc",
 	}, {
 		.name = "s5m8767-clk",
 		.of_compatible = "samsung,s5m8767-clk",
 	}
 };

 static const struct mfd_cell s2mps11_devs[] = {
 	{
 		.name = "s2mps11-pmic",
 	}, {
 		.name = "s2mps14-rtc",
 	}, {
 		.name = "s2mps11-clk",
 		.of_compatible = "samsung,s2mps11-clk",
 	}
 };

 static const struct mfd_cell s2mps13_devs[] = {
 	{ .name = "s2mps13-pmic", },
 	{ .name = "s2mps13-rtc", },
 	{
 		.name = "s2mps13-clk",
 		.of_compatible = "samsung,s2mps13-clk",
 	},
 };

 static const struct mfd_cell s2mps14_devs[] = {
 	{
 		.name = "s2mps14-pmic",
 	}, {
 		.name = "s2mps14-rtc",
 	}, {
 		.name = "s2mps14-clk",
 		.of_compatible = "samsung,s2mps14-clk",
 	}
 };

 static const struct mfd_cell s2mpa01_devs[] = {
 	{
 		.name = "s2mpa01-pmic",
 	},
 };

 static const struct mfd_cell s2mpu02_devs[] = {
 	{
 		.name = "s2mpu02-pmic",
 	},
 };

 #ifdef CONFIG_OF
 static const struct of_device_id sec_dt_match[] = {
 	{	.compatible = "samsung,s5m8767-pmic",
 		.data = (void *)S5M8767X,
 	}, {
 		.compatible = "samsung,s2mps11-pmic",
 		.data = (void *)S2MPS11X,
 	}, {
 		.compatible = "samsung,s2mps13-pmic",
 		.data = (void *)S2MPS13X,
 	}, {
 		.compatible = "samsung,s2mps14-pmic",
 		.data = (void *)S2MPS14X,
 	}, {
 		.compatible = "samsung,s2mpa01-pmic",
 		.data = (void *)S2MPA01,
 	}, {
 		.compatible = "samsung,s2mpu02-pmic",
 		.data = (void *)S2MPU02,
 	}, {
 		/* Sentinel */
 	},
 };
 #endif

 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case S2MPA01_REG_INT1M:
 	case S2MPA01_REG_INT2M:
 	case S2MPA01_REG_INT3M:
 		return false;
 	default:
 		return true;
 	}
 }

 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case S2MPS11_REG_INT1M:
 	case S2MPS11_REG_INT2M:
 	case S2MPS11_REG_INT3M:
 		return false;
 	default:
 		return true;
 	}
 }

 static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case S2MPU02_REG_INT1M:
 	case S2MPU02_REG_INT2M:
 	case S2MPU02_REG_INT3M:
 		return false;
 	default:
 		return true;
 	}
 }

 static bool s5m8763_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case S5M8763_REG_IRQM1:
 	case S5M8763_REG_IRQM2:
 	case S5M8763_REG_IRQM3:
 	case S5M8763_REG_IRQM4:
 		return false;
 	default:
 		return true;
 	}
 }

 static const struct regmap_config sec_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static const struct regmap_config s2mpa01_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S2MPA01_REG_LDO_OVCB4,
 	.volatile_reg = s2mpa01_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s2mps11_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S2MPS11_REG_L38CTRL,
 	.volatile_reg = s2mps11_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s2mps13_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S2MPS13_REG_LDODSCH5,
 	.volatile_reg = s2mps11_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s2mps14_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S2MPS14_REG_LDODSCH3,
 	.volatile_reg = s2mps11_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s2mpu02_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S2MPU02_REG_DVSDATA,
 	.volatile_reg = s2mpu02_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s5m8763_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S5M8763_REG_LBCNFG2,
 	.volatile_reg = s5m8763_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct regmap_config s5m8767_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,

 	.max_register = S5M8767_REG_LDO28CTRL,
 	.volatile_reg = s2mps11_volatile,
 	.cache_type = REGCACHE_FLAT,
 };

 static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
 {
 	unsigned int val;

 	/* For each device type, the REG_ID is always the first register */
 	if (!regmap_read(sec_pmic->regmap_pmic, S2MPS11_REG_ID, &val))
 		dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
 }

 static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
 {
 	int err;

 	if (sec_pmic->device_type != S2MPS13X)
 		return;

 	if (sec_pmic->pdata->disable_wrstbi) {
 		/*
 		 * If WRSTBI pin is pulled down this feature must be disabled
 		 * because each Suspend to RAM will trigger buck voltage reset
 		 * to default values.
 		 */
 		err = regmap_update_bits(sec_pmic->regmap_pmic,
 					 S2MPS13_REG_WRSTBI,
 					 S2MPS13_REG_WRSTBI_MASK, 0x0);
 		if (err)
 			dev_warn(sec_pmic->dev,
 				 "Cannot initialize WRSTBI config: %d\n",
 				 err);
 	}
 }

 #ifdef CONFIG_OF
 /*
  * Only the common platform data elements for s5m8767 are parsed here from the
  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
  * others have to parse their own platform data elements from device tree.
  *
  * The s5m8767 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 sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 					struct device *dev)
 {
 	struct sec_platform_data *pd;

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

 	/*
 	 * 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.
 	 */

 	pd->manual_poweroff = of_property_read_bool(dev->of_node,
 						"samsung,s2mps11-acokb-ground");
 	pd->disable_wrstbi = of_property_read_bool(dev->of_node,
 						"samsung,s2mps11-wrstbi-ground");
 	return pd;
 }
 #else
 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 					struct device *dev)
 {
 	return NULL;
 }
 #endif

 static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
 						const struct i2c_device_id *id)
 {
 #ifdef CONFIG_OF
 	if (i2c->dev.of_node) {
 		const struct of_device_id *match;

 		match = of_match_node(sec_dt_match, i2c->dev.of_node);
 		return (unsigned long)match->data;
 	}
 #endif
 	return id->driver_data;
 }

 static int sec_pmic_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	const struct regmap_config *regmap;
 	const struct mfd_cell *sec_devs;
 	struct sec_pmic_dev *sec_pmic;
 	unsigned long device_type;
 	int ret, num_sec_devs;

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

 	i2c_set_clientdata(i2c, sec_pmic);
 	sec_pmic->dev = &i2c->dev;
 	sec_pmic->i2c = i2c;
 	sec_pmic->irq = i2c->irq;
 	device_type = sec_i2c_get_driver_data(i2c, id);

 	if (sec_pmic->dev->of_node) {
 		pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 		if (IS_ERR(pdata)) {
 			ret = PTR_ERR(pdata);
 			return ret;
 		}
 		pdata->device_type = device_type;
 	}
 	if (pdata) {
 		sec_pmic->device_type = pdata->device_type;
 		sec_pmic->irq_base = pdata->irq_base;
 		sec_pmic->wakeup = pdata->wakeup;
 		sec_pmic->pdata = pdata;
 	}

 	switch (sec_pmic->device_type) {
 	case S2MPA01:
 		regmap = &s2mpa01_regmap_config;
 		break;
 	case S2MPS11X:
 		regmap = &s2mps11_regmap_config;
 		break;
 	case S2MPS13X:
 		regmap = &s2mps13_regmap_config;
 		break;
 	case S2MPS14X:
 		regmap = &s2mps14_regmap_config;
 		break;
 	case S5M8763X:
 		regmap = &s5m8763_regmap_config;
 		break;
 	case S5M8767X:
 		regmap = &s5m8767_regmap_config;
 		break;
 	case S2MPU02:
 		regmap = &s2mpu02_regmap_config;
 		break;
 	default:
 		regmap = &sec_regmap_config;
 		break;
 	}

 	sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
 	if (IS_ERR(sec_pmic->regmap_pmic)) {
 		ret = PTR_ERR(sec_pmic->regmap_pmic);
 		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 			ret);
 		return ret;
 	}

 	if (pdata && pdata->cfg_pmic_irq)
 		pdata->cfg_pmic_irq();

 	sec_irq_init(sec_pmic);

 	pm_runtime_set_active(sec_pmic->dev);

 	switch (sec_pmic->device_type) {
 	case S5M8751X:
 		sec_devs = s5m8751_devs;
 		num_sec_devs = ARRAY_SIZE(s5m8751_devs);
 		break;
 	case S5M8763X:
 		sec_devs = s5m8763_devs;
 		num_sec_devs = ARRAY_SIZE(s5m8763_devs);
 		break;
 	case S5M8767X:
 		sec_devs = s5m8767_devs;
 		num_sec_devs = ARRAY_SIZE(s5m8767_devs);
 		break;
 	case S2MPA01:
 		sec_devs = s2mpa01_devs;
 		num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
 		break;
 	case S2MPS11X:
 		sec_devs = s2mps11_devs;
 		num_sec_devs = ARRAY_SIZE(s2mps11_devs);
 		break;
 	case S2MPS13X:
 		sec_devs = s2mps13_devs;
 		num_sec_devs = ARRAY_SIZE(s2mps13_devs);
 		break;
 	case S2MPS14X:
 		sec_devs = s2mps14_devs;
 		num_sec_devs = ARRAY_SIZE(s2mps14_devs);
 		break;
 	case S2MPU02:
 		sec_devs = s2mpu02_devs;
 		num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
 		break;
 	default:
 		/* If this happens the probe function is problem */
 		BUG();
 	}
 	ret = mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs, NULL,
 			      0, NULL);
 	if (ret)
 		goto err_mfd;

 	device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
 	sec_pmic_configure(sec_pmic);
 	sec_pmic_dump_rev(sec_pmic);

 	return ret;

 err_mfd:
 	sec_irq_exit(sec_pmic);
 	return ret;
 }

 static int sec_pmic_remove(struct i2c_client *i2c)
 {
 	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

 	mfd_remove_devices(sec_pmic->dev);
 	sec_irq_exit(sec_pmic);
 	return 0;
 }

 static void sec_pmic_shutdown(struct i2c_client *i2c)
 {
 	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 	unsigned int reg, mask;

 	if (!sec_pmic->pdata->manual_poweroff)
 		return;

 	switch (sec_pmic->device_type) {
 	case S2MPS11X:
 		reg = S2MPS11_REG_CTRL1;
 		mask = S2MPS11_CTRL1_PWRHOLD_MASK;
 		break;
 	default:
 		/*
 		 * Currently only one board with S2MPS11 needs this, so just
 		 * ignore the rest.
 		 */
 		dev_warn(sec_pmic->dev,
 			"Unsupported device %lu for manual power off\n",
 			sec_pmic->device_type);
 		return;
 	}

 	regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
 }

 #ifdef CONFIG_PM_SLEEP
 static int sec_pmic_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev))
 		enable_irq_wake(sec_pmic->irq);
 	/*
 	 * PMIC IRQ must be disabled during suspend for RTC alarm
 	 * to work properly.
 	 * When device is woken up from suspend, an
 	 * interrupt occurs before resuming I2C bus controller.
 	 * The interrupt is handled by regmap_irq_thread which tries
 	 * to read RTC registers. This read fails (I2C is still
 	 * suspended) and RTC Alarm interrupt is disabled.
 	 */
 	disable_irq(sec_pmic->irq);

 	return 0;
 }

 static int sec_pmic_resume(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

 	if (device_may_wakeup(dev))
 		disable_irq_wake(sec_pmic->irq);
 	enable_irq(sec_pmic->irq);

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);

 static const struct i2c_device_id sec_pmic_id[] = {
 	{ "sec_pmic", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);

 static struct i2c_driver sec_pmic_driver = {
 	.driver = {
 		   .name = "sec_pmic",
 		   .pm = &sec_pmic_pm_ops,
 		   .of_match_table = of_match_ptr(sec_dt_match),
 	},
 	.probe = sec_pmic_probe,
 	.remove = sec_pmic_remove,
 	.shutdown = sec_pmic_shutdown,
 	.id_table = sec_pmic_id,
 };

 static int __init sec_pmic_init(void)
 {
 	return i2c_add_driver(&sec_pmic_driver);
 }

 subsys_initcall(sec_pmic_init);

 static void __exit sec_pmic_exit(void)
 {
 	i2c_del_driver(&sec_pmic_driver);
 }
 module_exit(sec_pmic_exit);

 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 MODULE_DESCRIPTION("Core support for the S5M MFD");
 MODULE_LICENSE("GPL");
	/*
	* sec-core.c
	*
	* Copyright (c) 2012 Samsung Electronics Co., Ltd
	* http://www.samsung.com
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#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/mutex.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/samsung/core.h>
	#include <linux/mfd/samsung/irq.h>
	#include <linux/mfd/samsung/s2mpa01.h>
	#include <linux/mfd/samsung/s2mps11.h>
	#include <linux/mfd/samsung/s2mps13.h>
	#include <linux/mfd/samsung/s2mps14.h>
	#include <linux/mfd/samsung/s2mpu02.h>
	#include <linux/mfd/samsung/s5m8763.h>
	#include <linux/mfd/samsung/s5m8767.h>
	#include <linux/regmap.h>

	static const struct mfd_cell s5m8751_devs[] = {
	{
	.name = "s5m8751-pmic",
	}, {
	.name = "s5m-charger",
	}, {
	.name = "s5m8751-codec",
	},
	};

	static const struct mfd_cell s5m8763_devs[] = {
	{
	.name = "s5m8763-pmic",
	}, {
	.name = "s5m-rtc",
	}, {
	.name = "s5m-charger",
	},
	};

	static const struct mfd_cell s5m8767_devs[] = {
	{
	.name = "s5m8767-pmic",
	}, {
	.name = "s5m-rtc",
	}, {
	.name = "s5m8767-clk",
	.of_compatible = "samsung,s5m8767-clk",
	}
	};

	static const struct mfd_cell s2mps11_devs[] = {
	{
	.name = "s2mps11-pmic",
	}, {
	.name = "s2mps14-rtc",
	}, {
	.name = "s2mps11-clk",
	.of_compatible = "samsung,s2mps11-clk",
	}
	};

	static const struct mfd_cell s2mps13_devs[] = {
	{ .name = "s2mps13-pmic", },
	{ .name = "s2mps13-rtc", },
	{
	.name = "s2mps13-clk",
	.of_compatible = "samsung,s2mps13-clk",
	},
	};

	static const struct mfd_cell s2mps14_devs[] = {
	{
	.name = "s2mps14-pmic",
	}, {
	.name = "s2mps14-rtc",
	}, {
	.name = "s2mps14-clk",
	.of_compatible = "samsung,s2mps14-clk",
	}
	};

	static const struct mfd_cell s2mpa01_devs[] = {
	{
	.name = "s2mpa01-pmic",
	},
	};

	static const struct mfd_cell s2mpu02_devs[] = {
	{
	.name = "s2mpu02-pmic",
	},
	};

	#ifdef CONFIG_OF
	static const struct of_device_id sec_dt_match[] = {
	{ .compatible = "samsung,s5m8767-pmic",
	.data = (void *)S5M8767X,
	}, {
	.compatible = "samsung,s2mps11-pmic",
	.data = (void *)S2MPS11X,
	}, {
	.compatible = "samsung,s2mps13-pmic",
	.data = (void *)S2MPS13X,
	}, {
	.compatible = "samsung,s2mps14-pmic",
	.data = (void *)S2MPS14X,
	}, {
	.compatible = "samsung,s2mpa01-pmic",
	.data = (void *)S2MPA01,
	}, {
	.compatible = "samsung,s2mpu02-pmic",
	.data = (void *)S2MPU02,
	}, {
	/* Sentinel */
	},
	};
	#endif

	static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case S2MPA01_REG_INT1M:
	case S2MPA01_REG_INT2M:
	case S2MPA01_REG_INT3M:
	return false;
	default:
	return true;
	}
	}

	static bool s2mps11_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case S2MPS11_REG_INT1M:
	case S2MPS11_REG_INT2M:
	case S2MPS11_REG_INT3M:
	return false;
	default:
	return true;
	}
	}

	static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case S2MPU02_REG_INT1M:
	case S2MPU02_REG_INT2M:
	case S2MPU02_REG_INT3M:
	return false;
	default:
	return true;
	}
	}

	static bool s5m8763_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case S5M8763_REG_IRQM1:
	case S5M8763_REG_IRQM2:
	case S5M8763_REG_IRQM3:
	case S5M8763_REG_IRQM4:
	return false;
	default:
	return true;
	}
	}

	static const struct regmap_config sec_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	};

	static const struct regmap_config s2mpa01_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S2MPA01_REG_LDO_OVCB4,
	.volatile_reg = s2mpa01_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s2mps11_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S2MPS11_REG_L38CTRL,
	.volatile_reg = s2mps11_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s2mps13_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S2MPS13_REG_LDODSCH5,
	.volatile_reg = s2mps11_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s2mps14_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S2MPS14_REG_LDODSCH3,
	.volatile_reg = s2mps11_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s2mpu02_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S2MPU02_REG_DVSDATA,
	.volatile_reg = s2mpu02_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s5m8763_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S5M8763_REG_LBCNFG2,
	.volatile_reg = s5m8763_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct regmap_config s5m8767_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = S5M8767_REG_LDO28CTRL,
	.volatile_reg = s2mps11_volatile,
	.cache_type = REGCACHE_FLAT,
	};

	static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
	{
	unsigned int val;

	/* For each device type, the REG_ID is always the first register */
	if (!regmap_read(sec_pmic->regmap_pmic, S2MPS11_REG_ID, &val))
	dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
	}

	static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
	{
	int err;

	if (sec_pmic->device_type != S2MPS13X)
	return;

	if (sec_pmic->pdata->disable_wrstbi) {
	/*
	* If WRSTBI pin is pulled down this feature must be disabled
	* because each Suspend to RAM will trigger buck voltage reset
	* to default values.
	*/
	err = regmap_update_bits(sec_pmic->regmap_pmic,
	S2MPS13_REG_WRSTBI,
	S2MPS13_REG_WRSTBI_MASK, 0x0);
	if (err)
	dev_warn(sec_pmic->dev,
	"Cannot initialize WRSTBI config: %d\n",
	err);
	}
	}

	#ifdef CONFIG_OF
	/*
	* Only the common platform data elements for s5m8767 are parsed here from the
	* device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
	* others have to parse their own platform data elements from device tree.
	*
	* The s5m8767 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 sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
	struct device *dev)
	{
	struct sec_platform_data *pd;

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

	/*
	* 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.
	*/

	pd->manual_poweroff = of_property_read_bool(dev->of_node,
	"samsung,s2mps11-acokb-ground");
	pd->disable_wrstbi = of_property_read_bool(dev->of_node,
	"samsung,s2mps11-wrstbi-ground");
	return pd;
	}
	#else
	static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
	struct device *dev)
	{
	return NULL;
	}
	#endif

	static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	#ifdef CONFIG_OF
	if (i2c->dev.of_node) {
	const struct of_device_id *match;

	match = of_match_node(sec_dt_match, i2c->dev.of_node);
	return (unsigned long)match->data;
	}
	#endif
	return id->driver_data;
	}

	static int sec_pmic_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
	const struct regmap_config *regmap;
	const struct mfd_cell *sec_devs;
	struct sec_pmic_dev *sec_pmic;
	unsigned long device_type;
	int ret, num_sec_devs;

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

	i2c_set_clientdata(i2c, sec_pmic);
	sec_pmic->dev = &i2c->dev;
	sec_pmic->i2c = i2c;
	sec_pmic->irq = i2c->irq;
	device_type = sec_i2c_get_driver_data(i2c, id);

	if (sec_pmic->dev->of_node) {
	pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
	if (IS_ERR(pdata)) {
	ret = PTR_ERR(pdata);
	return ret;
	}
	pdata->device_type = device_type;
	}
	if (pdata) {
	sec_pmic->device_type = pdata->device_type;
	sec_pmic->irq_base = pdata->irq_base;
	sec_pmic->wakeup = pdata->wakeup;
	sec_pmic->pdata = pdata;
	}

	switch (sec_pmic->device_type) {
	case S2MPA01:
	regmap = &s2mpa01_regmap_config;
	break;
	case S2MPS11X:
	regmap = &s2mps11_regmap_config;
	break;
	case S2MPS13X:
	regmap = &s2mps13_regmap_config;
	break;
	case S2MPS14X:
	regmap = &s2mps14_regmap_config;
	break;
	case S5M8763X:
	regmap = &s5m8763_regmap_config;
	break;
	case S5M8767X:
	regmap = &s5m8767_regmap_config;
	break;
	case S2MPU02:
	regmap = &s2mpu02_regmap_config;
	break;
	default:
	regmap = &sec_regmap_config;
	break;
	}

	sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
	if (IS_ERR(sec_pmic->regmap_pmic)) {
	ret = PTR_ERR(sec_pmic->regmap_pmic);
	dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	if (pdata && pdata->cfg_pmic_irq)
	pdata->cfg_pmic_irq();

	sec_irq_init(sec_pmic);

	pm_runtime_set_active(sec_pmic->dev);

	switch (sec_pmic->device_type) {
	case S5M8751X:
	sec_devs = s5m8751_devs;
	num_sec_devs = ARRAY_SIZE(s5m8751_devs);
	break;
	case S5M8763X:
	sec_devs = s5m8763_devs;
	num_sec_devs = ARRAY_SIZE(s5m8763_devs);
	break;
	case S5M8767X:
	sec_devs = s5m8767_devs;
	num_sec_devs = ARRAY_SIZE(s5m8767_devs);
	break;
	case S2MPA01:
	sec_devs = s2mpa01_devs;
	num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
	break;
	case S2MPS11X:
	sec_devs = s2mps11_devs;
	num_sec_devs = ARRAY_SIZE(s2mps11_devs);
	break;
	case S2MPS13X:
	sec_devs = s2mps13_devs;
	num_sec_devs = ARRAY_SIZE(s2mps13_devs);
	break;
	case S2MPS14X:
	sec_devs = s2mps14_devs;
	num_sec_devs = ARRAY_SIZE(s2mps14_devs);
	break;
	case S2MPU02:
	sec_devs = s2mpu02_devs;
	num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
	break;
	default:
	/* If this happens the probe function is problem */
	BUG();
	}
	ret = mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs, NULL,
	0, NULL);
	if (ret)
	goto err_mfd;

	device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
	sec_pmic_configure(sec_pmic);
	sec_pmic_dump_rev(sec_pmic);

	return ret;

	err_mfd:
	sec_irq_exit(sec_pmic);
	return ret;
	}

	static int sec_pmic_remove(struct i2c_client *i2c)
	{
	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

	mfd_remove_devices(sec_pmic->dev);
	sec_irq_exit(sec_pmic);
	return 0;
	}

	static void sec_pmic_shutdown(struct i2c_client *i2c)
	{
	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
	unsigned int reg, mask;

	if (!sec_pmic->pdata->manual_poweroff)
	return;

	switch (sec_pmic->device_type) {
	case S2MPS11X:
	reg = S2MPS11_REG_CTRL1;
	mask = S2MPS11_CTRL1_PWRHOLD_MASK;
	break;
	default:
	/*
	* Currently only one board with S2MPS11 needs this, so just
	* ignore the rest.
	*/
	dev_warn(sec_pmic->dev,
	"Unsupported device %lu for manual power off\n",
	sec_pmic->device_type);
	return;
	}

	regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
	}

	#ifdef CONFIG_PM_SLEEP
	static int sec_pmic_suspend(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
	enable_irq_wake(sec_pmic->irq);
	/*
	* PMIC IRQ must be disabled during suspend for RTC alarm
	* to work properly.
	* When device is woken up from suspend, an
	* interrupt occurs before resuming I2C bus controller.
	* The interrupt is handled by regmap_irq_thread which tries
	* to read RTC registers. This read fails (I2C is still
	* suspended) and RTC Alarm interrupt is disabled.
	*/
	disable_irq(sec_pmic->irq);

	return 0;
	}

	static int sec_pmic_resume(struct device *dev)
	{
	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
	disable_irq_wake(sec_pmic->irq);
	enable_irq(sec_pmic->irq);

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);

	static const struct i2c_device_id sec_pmic_id[] = {
	{ "sec_pmic", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, sec_pmic_id);

	static struct i2c_driver sec_pmic_driver = {
	.driver = {
	.name = "sec_pmic",
	.pm = &sec_pmic_pm_ops,
	.of_match_table = of_match_ptr(sec_dt_match),
	},
	.probe = sec_pmic_probe,
	.remove = sec_pmic_remove,
	.shutdown = sec_pmic_shutdown,
	.id_table = sec_pmic_id,
	};

	static int __init sec_pmic_init(void)
	{
	return i2c_add_driver(&sec_pmic_driver);
	}

	subsys_initcall(sec_pmic_init);

	static void __exit sec_pmic_exit(void)
	{
	i2c_del_driver(&sec_pmic_driver);
	}
	module_exit(sec_pmic_exit);

	MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
	MODULE_DESCRIPTION("Core support for the S5M MFD");
	MODULE_LICENSE("GPL");