drivers/mfd/rc5t583.c - pub/scm/linux/kernel/git/cooloney/linux-leds - Git at Google

 /*
  * Core driver access RC5T583 power management chip.
  *
  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
  * Author: Laxman dewangan <ldewangan@nvidia.com>
  *
  * Based on code
  *	Copyright (C) 2011 RICOH COMPANY,LTD
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/rc5t583.h>
 #include <linux/regmap.h>

 #define RICOH_ONOFFSEL_REG	0x10
 #define RICOH_SWCTL_REG		0x5E

 struct deepsleep_control_data {
 	u8 reg_add;
 	u8 ds_pos_bit;
 };

 #define DEEPSLEEP_INIT(_id, _reg, _pos)		\
 	{					\
 		.reg_add = RC5T583_##_reg,	\
 		.ds_pos_bit = _pos,		\
 	}

 static struct deepsleep_control_data deepsleep_data[] = {
 	DEEPSLEEP_INIT(DC0, SLPSEQ1, 0),
 	DEEPSLEEP_INIT(DC1, SLPSEQ1, 4),
 	DEEPSLEEP_INIT(DC2, SLPSEQ2, 0),
 	DEEPSLEEP_INIT(DC3, SLPSEQ2, 4),
 	DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0),
 	DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4),
 	DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0),
 	DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4),
 	DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0),
 	DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4),
 	DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0),
 	DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4),
 	DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0),
 	DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4),
 	DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0),
 	DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4),
 	DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0),
 	DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4),
 	DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0),
 	DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4),
 	DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0),
 	DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4),
 };

 #define EXT_PWR_REQ		\
 	(RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL)

 static const struct mfd_cell rc5t583_subdevs[] = {
 	{.name = "rc5t583-gpio",},
 	{.name = "rc5t583-regulator",},
 	{.name = "rc5t583-rtc",      },
 	{.name = "rc5t583-key",      }
 };

 static int __rc5t583_set_ext_pwrreq1_control(struct device *dev,
 	int id, int ext_pwr, int slots)
 {
 	int ret;
 	uint8_t sleepseq_val = 0;
 	unsigned int en_bit;
 	unsigned int slot_bit;

 	if (id == RC5T583_DS_DC0) {
 		dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id);
 		return -EINVAL;
 	}

 	en_bit = deepsleep_data[id].ds_pos_bit;
 	slot_bit = en_bit + 1;
 	ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val);
 	if (ret < 0) {
 		dev_err(dev, "Error in reading reg 0x%x\n",
 				deepsleep_data[id].reg_add);
 		return ret;
 	}

 	sleepseq_val &= ~(0xF << en_bit);
 	sleepseq_val |= BIT(en_bit);
 	sleepseq_val |= ((slots & 0x7) << slot_bit);
 	ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1));
 	if (ret < 0) {
 		dev_err(dev, "Error in updating the 0x%02x register\n",
 				RICOH_ONOFFSEL_REG);
 		return ret;
 	}

 	ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val);
 	if (ret < 0) {
 		dev_err(dev, "Error in writing reg 0x%x\n",
 				deepsleep_data[id].reg_add);
 		return ret;
 	}

 	if (id == RC5T583_DS_LDO4) {
 		ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1);
 		if (ret < 0)
 			dev_err(dev, "Error in writing reg 0x%x\n",
 				RICOH_SWCTL_REG);
 	}
 	return ret;
 }

 static int __rc5t583_set_ext_pwrreq2_control(struct device *dev,
 	int id, int ext_pwr)
 {
 	int ret;

 	if (id != RC5T583_DS_DC0) {
 		dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id);
 		return -EINVAL;
 	}

 	ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2));
 	if (ret < 0)
 		dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n");
 	return ret;
 }

 int rc5t583_ext_power_req_config(struct device *dev, int ds_id,
 	int ext_pwr_req, int deepsleep_slot_nr)
 {
 	if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ)
 		return -EINVAL;

 	if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL)
 		return __rc5t583_set_ext_pwrreq1_control(dev, ds_id,
 				ext_pwr_req, deepsleep_slot_nr);

 	if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL)
 		return __rc5t583_set_ext_pwrreq2_control(dev,
 			ds_id, ext_pwr_req);
 	return 0;
 }
 EXPORT_SYMBOL(rc5t583_ext_power_req_config);

 static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583,
 	struct rc5t583_platform_data *pdata)
 {
 	int ret;
 	int i;
 	uint8_t on_off_val = 0;

 	/*  Clear ONOFFSEL register */
 	if (pdata->enable_shutdown)
 		on_off_val = 0x1;

 	ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val);
 	if (ret < 0)
 		dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
 					RICOH_ONOFFSEL_REG, ret);

 	ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0);
 	if (ret < 0)
 		dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
 					RICOH_SWCTL_REG, ret);

 	/* Clear sleep sequence register */
 	for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) {
 		ret = rc5t583_write(rc5t583->dev, i, 0x0);
 		if (ret < 0)
 			dev_warn(rc5t583->dev,
 				"Error in writing reg 0x%02x error: %d\n",
 				i, ret);
 	}
 	return 0;
 }

 static bool volatile_reg(struct device *dev, unsigned int reg)
 {
 	/* Enable caching in interrupt registers */
 	switch (reg) {
 	case RC5T583_INT_EN_SYS1:
 	case RC5T583_INT_EN_SYS2:
 	case RC5T583_INT_EN_DCDC:
 	case RC5T583_INT_EN_RTC:
 	case RC5T583_INT_EN_ADC1:
 	case RC5T583_INT_EN_ADC2:
 	case RC5T583_INT_EN_ADC3:
 	case RC5T583_GPIO_GPEDGE1:
 	case RC5T583_GPIO_GPEDGE2:
 	case RC5T583_GPIO_EN_INT:
 		return false;

 	case RC5T583_GPIO_MON_IOIN:
 		/* This is gpio input register */
 		return true;

 	default:
 		/* Enable caching in gpio registers */
 		if ((reg >= RC5T583_GPIO_IOSEL) &&
 				(reg <= RC5T583_GPIO_GPOFUNC))
 			return false;

 		/* Enable caching in sleep seq registers */
 		if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11))
 			return false;

 		/* Enable caching of regulator registers */
 		if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL))
 			return false;
 		if ((reg >= RC5T583_REG_LDOEN1) &&
 					(reg <= RC5T583_REG_LDO9DAC_DS))
 			return false;

 		break;
 	}

 	return true;
 }

 static const struct regmap_config rc5t583_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.volatile_reg = volatile_reg,
 	.max_register = RC5T583_MAX_REGS,
 	.num_reg_defaults_raw = RC5T583_MAX_REGS,
 	.cache_type = REGCACHE_RBTREE,
 };

 static int rc5t583_i2c_probe(struct i2c_client *i2c,
 			      const struct i2c_device_id *id)
 {
 	struct rc5t583 *rc5t583;
 	struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	int ret;
 	bool irq_init_success = false;

 	if (!pdata) {
 		dev_err(&i2c->dev, "Err: Platform data not found\n");
 		return -EINVAL;
 	}

 	rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL);
 	if (!rc5t583) {
 		dev_err(&i2c->dev, "Memory allocation failed\n");
 		return -ENOMEM;
 	}

 	rc5t583->dev = &i2c->dev;
 	i2c_set_clientdata(i2c, rc5t583);

 	rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config);
 	if (IS_ERR(rc5t583->regmap)) {
 		ret = PTR_ERR(rc5t583->regmap);
 		dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
 		return ret;
 	}

 	ret = rc5t583_clear_ext_power_req(rc5t583, pdata);
 	if (ret < 0)
 		return ret;

 	if (i2c->irq) {
 		ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
 		/* Still continue with warning, if irq init fails */
 		if (ret)
 			dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
 		else
 			irq_init_success = true;
 	}

 	ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
 			      ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL);
 	if (ret) {
 		dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
 		goto err_add_devs;
 	}

 	return 0;

 err_add_devs:
 	if (irq_init_success)
 		rc5t583_irq_exit(rc5t583);
 	return ret;
 }

 static int  rc5t583_i2c_remove(struct i2c_client *i2c)
 {
 	struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c);

 	mfd_remove_devices(rc5t583->dev);
 	rc5t583_irq_exit(rc5t583);
 	return 0;
 }

 static const struct i2c_device_id rc5t583_i2c_id[] = {
 	{.name = "rc5t583", .driver_data = 0},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);

 static struct i2c_driver rc5t583_i2c_driver = {
 	.driver = {
 		   .name = "rc5t583",
 		   .owner = THIS_MODULE,
 		   },
 	.probe = rc5t583_i2c_probe,
 	.remove = rc5t583_i2c_remove,
 	.id_table = rc5t583_i2c_id,
 };

 static int __init rc5t583_i2c_init(void)
 {
 	return i2c_add_driver(&rc5t583_i2c_driver);
 }
 subsys_initcall(rc5t583_i2c_init);

 static void __exit rc5t583_i2c_exit(void)
 {
 	i2c_del_driver(&rc5t583_i2c_driver);
 }

 module_exit(rc5t583_i2c_exit);

 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Core driver access RC5T583 power management chip.
	*
	* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
	* Author: Laxman dewangan <ldewangan@nvidia.com>
	*
	* Based on code
	* Copyright (C) 2011 RICOH COMPANY,LTD
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/rc5t583.h>
	#include <linux/regmap.h>

	#define RICOH_ONOFFSEL_REG 0x10
	#define RICOH_SWCTL_REG 0x5E

	struct deepsleep_control_data {
	u8 reg_add;
	u8 ds_pos_bit;
	};

	#define DEEPSLEEP_INIT(_id, _reg, _pos) \
	{ \
	.reg_add = RC5T583_##_reg, \
	.ds_pos_bit = _pos, \
	}

	static struct deepsleep_control_data deepsleep_data[] = {
	DEEPSLEEP_INIT(DC0, SLPSEQ1, 0),
	DEEPSLEEP_INIT(DC1, SLPSEQ1, 4),
	DEEPSLEEP_INIT(DC2, SLPSEQ2, 0),
	DEEPSLEEP_INIT(DC3, SLPSEQ2, 4),
	DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0),
	DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4),
	DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0),
	DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4),
	DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0),
	DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4),
	DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0),
	DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4),
	DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0),
	DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4),
	DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0),
	DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4),
	DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0),
	DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4),
	DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0),
	DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4),
	DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0),
	DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4),
	};

	#define EXT_PWR_REQ \
	(RC5T583_EXT_PWRREQ1_CONTROL \| RC5T583_EXT_PWRREQ2_CONTROL)

	static const struct mfd_cell rc5t583_subdevs[] = {
	{.name = "rc5t583-gpio",},
	{.name = "rc5t583-regulator",},
	{.name = "rc5t583-rtc", },
	{.name = "rc5t583-key", }
	};

	static int __rc5t583_set_ext_pwrreq1_control(struct device *dev,
	int id, int ext_pwr, int slots)
	{
	int ret;
	uint8_t sleepseq_val = 0;
	unsigned int en_bit;
	unsigned int slot_bit;

	if (id == RC5T583_DS_DC0) {
	dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id);
	return -EINVAL;
	}

	en_bit = deepsleep_data[id].ds_pos_bit;
	slot_bit = en_bit + 1;
	ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val);
	if (ret < 0) {
	dev_err(dev, "Error in reading reg 0x%x\n",
	deepsleep_data[id].reg_add);
	return ret;
	}

	sleepseq_val &= ~(0xF << en_bit);
	sleepseq_val \|= BIT(en_bit);
	sleepseq_val \|= ((slots & 0x7) << slot_bit);
	ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1));
	if (ret < 0) {
	dev_err(dev, "Error in updating the 0x%02x register\n",
	RICOH_ONOFFSEL_REG);
	return ret;
	}

	ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val);
	if (ret < 0) {
	dev_err(dev, "Error in writing reg 0x%x\n",
	deepsleep_data[id].reg_add);
	return ret;
	}

	if (id == RC5T583_DS_LDO4) {
	ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1);
	if (ret < 0)
	dev_err(dev, "Error in writing reg 0x%x\n",
	RICOH_SWCTL_REG);
	}
	return ret;
	}

	static int __rc5t583_set_ext_pwrreq2_control(struct device *dev,
	int id, int ext_pwr)
	{
	int ret;

	if (id != RC5T583_DS_DC0) {
	dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id);
	return -EINVAL;
	}

	ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2));
	if (ret < 0)
	dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n");
	return ret;
	}

	int rc5t583_ext_power_req_config(struct device *dev, int ds_id,
	int ext_pwr_req, int deepsleep_slot_nr)
	{
	if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ)
	return -EINVAL;

	if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL)
	return __rc5t583_set_ext_pwrreq1_control(dev, ds_id,
	ext_pwr_req, deepsleep_slot_nr);

	if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL)
	return __rc5t583_set_ext_pwrreq2_control(dev,
	ds_id, ext_pwr_req);
	return 0;
	}
	EXPORT_SYMBOL(rc5t583_ext_power_req_config);

	static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583,
	struct rc5t583_platform_data *pdata)
	{
	int ret;
	int i;
	uint8_t on_off_val = 0;

	/* Clear ONOFFSEL register */
	if (pdata->enable_shutdown)
	on_off_val = 0x1;

	ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val);
	if (ret < 0)
	dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
	RICOH_ONOFFSEL_REG, ret);

	ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0);
	if (ret < 0)
	dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n",
	RICOH_SWCTL_REG, ret);

	/* Clear sleep sequence register */
	for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) {
	ret = rc5t583_write(rc5t583->dev, i, 0x0);
	if (ret < 0)
	dev_warn(rc5t583->dev,
	"Error in writing reg 0x%02x error: %d\n",
	i, ret);
	}
	return 0;
	}

	static bool volatile_reg(struct device *dev, unsigned int reg)
	{
	/* Enable caching in interrupt registers */
	switch (reg) {
	case RC5T583_INT_EN_SYS1:
	case RC5T583_INT_EN_SYS2:
	case RC5T583_INT_EN_DCDC:
	case RC5T583_INT_EN_RTC:
	case RC5T583_INT_EN_ADC1:
	case RC5T583_INT_EN_ADC2:
	case RC5T583_INT_EN_ADC3:
	case RC5T583_GPIO_GPEDGE1:
	case RC5T583_GPIO_GPEDGE2:
	case RC5T583_GPIO_EN_INT:
	return false;

	case RC5T583_GPIO_MON_IOIN:
	/* This is gpio input register */
	return true;

	default:
	/* Enable caching in gpio registers */
	if ((reg >= RC5T583_GPIO_IOSEL) &&
	(reg <= RC5T583_GPIO_GPOFUNC))
	return false;

	/* Enable caching in sleep seq registers */
	if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11))
	return false;

	/* Enable caching of regulator registers */
	if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL))
	return false;
	if ((reg >= RC5T583_REG_LDOEN1) &&
	(reg <= RC5T583_REG_LDO9DAC_DS))
	return false;

	break;
	}

	return true;
	}

	static const struct regmap_config rc5t583_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = volatile_reg,
	.max_register = RC5T583_MAX_REGS,
	.num_reg_defaults_raw = RC5T583_MAX_REGS,
	.cache_type = REGCACHE_RBTREE,
	};

	static int rc5t583_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct rc5t583 *rc5t583;
	struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev);
	int ret;
	bool irq_init_success = false;

	if (!pdata) {
	dev_err(&i2c->dev, "Err: Platform data not found\n");
	return -EINVAL;
	}

	rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL);
	if (!rc5t583) {
	dev_err(&i2c->dev, "Memory allocation failed\n");
	return -ENOMEM;
	}

	rc5t583->dev = &i2c->dev;
	i2c_set_clientdata(i2c, rc5t583);

	rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config);
	if (IS_ERR(rc5t583->regmap)) {
	ret = PTR_ERR(rc5t583->regmap);
	dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
	return ret;
	}

	ret = rc5t583_clear_ext_power_req(rc5t583, pdata);
	if (ret < 0)
	return ret;

	if (i2c->irq) {
	ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
	/* Still continue with warning, if irq init fails */
	if (ret)
	dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
	else
	irq_init_success = true;
	}

	ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
	ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL);
	if (ret) {
	dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
	goto err_add_devs;
	}

	return 0;

	err_add_devs:
	if (irq_init_success)
	rc5t583_irq_exit(rc5t583);
	return ret;
	}

	static int rc5t583_i2c_remove(struct i2c_client *i2c)
	{
	struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c);

	mfd_remove_devices(rc5t583->dev);
	rc5t583_irq_exit(rc5t583);
	return 0;
	}

	static const struct i2c_device_id rc5t583_i2c_id[] = {
	{.name = "rc5t583", .driver_data = 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);

	static struct i2c_driver rc5t583_i2c_driver = {
	.driver = {
	.name = "rc5t583",
	.owner = THIS_MODULE,
	},
	.probe = rc5t583_i2c_probe,
	.remove = rc5t583_i2c_remove,
	.id_table = rc5t583_i2c_id,
	};

	static int __init rc5t583_i2c_init(void)
	{
	return i2c_add_driver(&rc5t583_i2c_driver);
	}
	subsys_initcall(rc5t583_i2c_init);

	static void __exit rc5t583_i2c_exit(void)
	{
	i2c_del_driver(&rc5t583_i2c_driver);
	}

	module_exit(rc5t583_i2c_exit);

	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
	MODULE_LICENSE("GPL v2");