[mirror_ubuntu-artful-kernel.git] / drivers / regulator / max77686.c

/*
 * max77686.c - Regulator driver for the Maxim 77686
 *
 * Copyright (C) 2012 Samsung Electronics
 * Chiwoong Byun <woong.byun@smasung.com>
 * Jonghwa Lee <jonghwa3.lee@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.
 *
 * This program is distributed in the hope that 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This driver is based on max8997.c
 */

#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>

#define MAX77686_LDO_MINUV	800000
#define MAX77686_LDO_UVSTEP	50000
#define MAX77686_LDO_LOW_MINUV	800000
#define MAX77686_LDO_LOW_UVSTEP	25000
#define MAX77686_BUCK_MINUV	750000
#define MAX77686_BUCK_UVSTEP	50000
#define MAX77686_DVS_MINUV	600000
#define MAX77686_DVS_UVSTEP	12500

#define MAX77686_OPMODE_SHIFT	6
#define MAX77686_OPMODE_BUCK234_SHIFT	4
#define MAX77686_OPMODE_MASK	0x3

#define MAX77686_VSEL_MASK	0x3F
#define MAX77686_DVS_VSEL_MASK	0xFF

#define MAX77686_RAMP_RATE_MASK	0xC0

#define MAX77686_REGULATORS	MAX77686_REG_MAX
#define MAX77686_LDOS		26

enum max77686_ramp_rate {
	RAMP_RATE_13P75MV,
	RAMP_RATE_27P5MV,
	RAMP_RATE_55MV,
	RAMP_RATE_NO_CTRL,	/* 100mV/us */
};

struct max77686_data {
	struct device *dev;
	struct max77686_dev *iodev;
	int num_regulators;
	struct regulator_dev **rdev;
	int ramp_delay; /* in mV/us */
};

static int max77686_set_dvs_voltage_time_sel(struct regulator_dev *rdev,
			unsigned int old_selector, unsigned int new_selector)
{
	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
	int ramp_rate[] = {13, 27, 55, 100};
	return (DIV_ROUND_UP(rdev->desc->uV_step
			* abs(new_selector - old_selector),
			ramp_rate[max77686->ramp_delay]));
}

static int max77686_set_voltage_time_sel(struct regulator_dev *rdev,
			unsigned int old_selector, unsigned int new_selector)
{
	/* Unconditionally 100 mV/us */
	return (DIV_ROUND_UP(rdev->desc->uV_step
		 * abs(new_selector - old_selector), 100));
}

static struct regulator_ops max77686_ops = {
	.list_voltage		= regulator_list_voltage_linear,
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_voltage_time_sel	= max77686_set_voltage_time_sel,
};

static struct regulator_ops max77686_buck_dvs_ops = {
	.list_voltage		= regulator_list_voltage_linear,
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.set_voltage_time_sel	= max77686_set_dvs_voltage_time_sel,
};

#define regulator_desc_ldo(num)		{				\
	.name		= "LDO"#num,					\
	.id		= MAX77686_LDO##num,				\
	.ops		= &max77686_ops,				\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.min_uV		= MAX77686_LDO_MINUV,				\
	.uV_step	= MAX77686_LDO_UVSTEP,				\
	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
	.vsel_mask	= MAX77686_VSEL_MASK,				\
	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
	.enable_mask	= MAX77686_OPMODE_MASK				\
			<< MAX77686_OPMODE_SHIFT,			\
}
#define regulator_desc_ldo_low(num)		{			\
	.name		= "LDO"#num,					\
	.id		= MAX77686_LDO##num,				\
	.ops		= &max77686_ops,				\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.min_uV		= MAX77686_LDO_LOW_MINUV,			\
	.uV_step	= MAX77686_LDO_LOW_UVSTEP,			\
	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
	.vsel_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
	.vsel_mask	= MAX77686_VSEL_MASK,				\
	.enable_reg	= MAX77686_REG_LDO1CTRL1 + num - 1,		\
	.enable_mask	= MAX77686_OPMODE_MASK				\
			<< MAX77686_OPMODE_SHIFT,			\
}
#define regulator_desc_buck(num)		{			\
	.name		= "BUCK"#num,					\
	.id		= MAX77686_BUCK##num,				\
	.ops		= &max77686_ops,				\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.min_uV		= MAX77686_BUCK_MINUV,				\
	.uV_step	= MAX77686_BUCK_UVSTEP,				\
	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
	.vsel_reg	= MAX77686_REG_BUCK5OUT + (num - 5) * 2,	\
	.vsel_mask	= MAX77686_VSEL_MASK,				\
	.enable_reg	= MAX77686_REG_BUCK5CTRL + (num - 5) * 2,	\
	.enable_mask	= MAX77686_OPMODE_MASK,				\
}
#define regulator_desc_buck1(num)		{			\
	.name		= "BUCK"#num,					\
	.id		= MAX77686_BUCK##num,				\
	.ops		= &max77686_ops,				\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.min_uV		= MAX77686_BUCK_MINUV,				\
	.uV_step	= MAX77686_BUCK_UVSTEP,				\
	.n_voltages	= MAX77686_VSEL_MASK + 1,			\
	.vsel_reg	= MAX77686_REG_BUCK1OUT,			\
	.vsel_mask	= MAX77686_VSEL_MASK,				\
	.enable_reg	= MAX77686_REG_BUCK1CTRL,			\
	.enable_mask	= MAX77686_OPMODE_MASK,				\
}
#define regulator_desc_buck_dvs(num)		{			\
	.name		= "BUCK"#num,					\
	.id		= MAX77686_BUCK##num,				\
	.ops		= &max77686_buck_dvs_ops,				\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.min_uV		= MAX77686_DVS_MINUV,				\
	.uV_step	= MAX77686_DVS_UVSTEP,				\
	.n_voltages	= MAX77686_DVS_VSEL_MASK + 1,			\
	.vsel_reg	= MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,	\
	.vsel_mask	= MAX77686_DVS_VSEL_MASK,			\
	.enable_reg	= MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,	\
	.enable_mask	= MAX77686_OPMODE_MASK				\
			<< MAX77686_OPMODE_BUCK234_SHIFT,		\
}

static struct regulator_desc regulators[] = {
	regulator_desc_ldo_low(1),
	regulator_desc_ldo_low(2),
	regulator_desc_ldo(3),
	regulator_desc_ldo(4),
	regulator_desc_ldo(5),
	regulator_desc_ldo_low(6),
	regulator_desc_ldo_low(7),
	regulator_desc_ldo_low(8),
	regulator_desc_ldo(9),
	regulator_desc_ldo(10),
	regulator_desc_ldo(11),
	regulator_desc_ldo(12),
	regulator_desc_ldo(13),
	regulator_desc_ldo(14),
	regulator_desc_ldo_low(15),
	regulator_desc_ldo(16),
	regulator_desc_ldo(17),
	regulator_desc_ldo(18),
	regulator_desc_ldo(19),
	regulator_desc_ldo(20),
	regulator_desc_ldo(21),
	regulator_desc_ldo(22),
	regulator_desc_ldo(23),
	regulator_desc_ldo(24),
	regulator_desc_ldo(25),
	regulator_desc_ldo(26),
	regulator_desc_buck1(1),
	regulator_desc_buck_dvs(2),
	regulator_desc_buck_dvs(3),
	regulator_desc_buck_dvs(4),
	regulator_desc_buck(5),
	regulator_desc_buck(6),
	regulator_desc_buck(7),
	regulator_desc_buck(8),
	regulator_desc_buck(9),
};

static __devinit int max77686_pmic_probe(struct platform_device *pdev)
{
	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct regulator_dev **rdev;
	struct max77686_data *max77686;
	int i,  size;
	int ret = 0;
	struct regulator_config config;

	dev_dbg(&pdev->dev, "%s\n", __func__);

	max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
				GFP_KERNEL);
	if (!max77686)
		return -ENOMEM;

	size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS;
	max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!max77686->rdev)
		return -ENOMEM;

	rdev = max77686->rdev;
	max77686->dev = &pdev->dev;
	max77686->iodev = iodev;
	if (pdata)
		max77686->num_regulators = pdata->num_regulators;
	platform_set_drvdata(pdev, max77686);

	max77686->ramp_delay = RAMP_RATE_NO_CTRL; /* Set 0x3 for RAMP */
	regmap_update_bits(max77686->iodev->regmap,
			MAX77686_REG_BUCK2CTRL1, MAX77686_RAMP_RATE_MASK,
			max77686->ramp_delay << 6);
	regmap_update_bits(max77686->iodev->regmap,
			MAX77686_REG_BUCK3CTRL1, MAX77686_RAMP_RATE_MASK,
			max77686->ramp_delay << 6);
	regmap_update_bits(max77686->iodev->regmap,
			MAX77686_REG_BUCK4CTRL1, MAX77686_RAMP_RATE_MASK,
			max77686->ramp_delay << 6);

	if (pdata->num_regulators == MAX77686_REGULATORS) {
		for (i = 0; i < MAX77686_REGULATORS; i++) {
			config.dev = max77686->dev;
			config.regmap = iodev->regmap;
			config.driver_data = max77686;
			config.init_data = pdata->regulators[i].initdata;

			rdev[i] = regulator_register(&regulators[i], &config);

			if (IS_ERR(rdev[i])) {
				ret = PTR_ERR(rdev[i]);
				dev_err(max77686->dev,
				"regulator init failed for %d\n", i);
				rdev[i] = NULL;
				goto err;
			}
		}
	} else {
		dev_err(max77686->dev,
			 "Lack of initial data for regulator's initialiation\n");
		return -EINVAL;
	}
	return 0;
err:
	for (i = 0; i < MAX77686_REGULATORS; i++) {
		if (rdev[i])
			regulator_unregister(rdev[i]);
	}
	return ret;
}

static int __devexit max77686_pmic_remove(struct platform_device *pdev)
{
	struct max77686_data *max77686 = platform_get_drvdata(pdev);
	struct regulator_dev **rdev = max77686->rdev;
	int i;

	for (i = 0; i < MAX77686_REGULATORS; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	return 0;
}

static const struct platform_device_id max77686_pmic_id[] = {
	{"max77686-pmic", 0},
	{ },
};
MODULE_DEVICE_TABLE(platform, max77686_pmic_id);

static struct platform_driver max77686_pmic_driver = {
	.driver = {
		.name = "max77686-pmic",
		.owner = THIS_MODULE,
	},
	.probe = max77686_pmic_probe,
	.remove = __devexit_p(max77686_pmic_remove),
	.id_table = max77686_pmic_id,
};

static int __init max77686_pmic_init(void)
{
	return platform_driver_register(&max77686_pmic_driver);
}
subsys_initcall(max77686_pmic_init);

static void __exit max77686_pmic_cleanup(void)
{
	platform_driver_unregister(&max77686_pmic_driver);
}
module_exit(max77686_pmic_cleanup);

MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
133d4016 JL	1	/*
	2	* max77686.c - Regulator driver for the Maxim 77686
	3	*
	4	* Copyright (C) 2012 Samsung Electronics
	5	* Chiwoong Byun <woong.byun@smasung.com>
	6	* Jonghwa Lee <jonghwa3.lee@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* This driver is based on max8997.c
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/bug.h>
	27	#include <linux/delay.h>
	28	#include <linux/err.h>
	29	#include <linux/gpio.h>
	30	#include <linux/slab.h>
	31	#include <linux/platform_device.h>
	32	#include <linux/regulator/driver.h>
	33	#include <linux/regulator/machine.h>
	34	#include <linux/mfd/max77686.h>
	35	#include <linux/mfd/max77686-private.h>
	36
	37	#define MAX77686_LDO_MINUV 800000
	38	#define MAX77686_LDO_UVSTEP 50000
	39	#define MAX77686_LDO_LOW_MINUV 800000
	40	#define MAX77686_LDO_LOW_UVSTEP 25000
	41	#define MAX77686_BUCK_MINUV 750000
	42	#define MAX77686_BUCK_UVSTEP 50000
	43	#define MAX77686_DVS_MINUV 600000
	44	#define MAX77686_DVS_UVSTEP 12500
	45
	46	#define MAX77686_OPMODE_SHIFT 6
	47	#define MAX77686_OPMODE_BUCK234_SHIFT 4
	48	#define MAX77686_OPMODE_MASK 0x3
	49
	50	#define MAX77686_VSEL_MASK 0x3F
	51	#define MAX77686_DVS_VSEL_MASK 0xFF
	52
	53	#define MAX77686_RAMP_RATE_MASK 0xC0
	54
	55	#define MAX77686_REGULATORS MAX77686_REG_MAX
	56	#define MAX77686_LDOS 26
	57
	58	enum max77686_ramp_rate {
	59	RAMP_RATE_13P75MV,
	60	RAMP_RATE_27P5MV,
	61	RAMP_RATE_55MV,
	62	RAMP_RATE_NO_CTRL, /* 100mV/us */
	63	};
	64
65	struct max77686_data {
66	struct device *dev;
67	struct max77686_dev *iodev;
68	int num_regulators;
69	struct regulator_dev **rdev;
70	int ramp_delay; /* in mV/us */
71	};
72
73	static int max77686_set_dvs_voltage_time_sel(struct regulator_dev *rdev,
74	unsigned int old_selector, unsigned int new_selector)
75	{
76	struct max77686_data *max77686 = rdev_get_drvdata(rdev);
77	int ramp_rate[] = {13, 27, 55, 100};
78	return (DIV_ROUND_UP(rdev->desc->uV_step
79	* abs(new_selector - old_selector),
80	ramp_rate[max77686->ramp_delay]));
81	}
82
83	static int max77686_set_voltage_time_sel(struct regulator_dev *rdev,
84	unsigned int old_selector, unsigned int new_selector)
85	{
86	/* Unconditionally 100 mV/us */
87	return (DIV_ROUND_UP(rdev->desc->uV_step
88	* abs(new_selector - old_selector), 100));
89	}
90
91	static struct regulator_ops max77686_ops = {
92	.list_voltage = regulator_list_voltage_linear,
93	.is_enabled = regulator_is_enabled_regmap,
94	.enable = regulator_enable_regmap,
95	.disable = regulator_disable_regmap,
96	.get_voltage_sel = regulator_get_voltage_sel_regmap,
97	.set_voltage_sel = regulator_set_voltage_sel_regmap,
98	.set_voltage_time_sel = max77686_set_voltage_time_sel,
99	};
100
101	static struct regulator_ops max77686_buck_dvs_ops = {
102	.list_voltage = regulator_list_voltage_linear,
103	.is_enabled = regulator_is_enabled_regmap,
104	.enable = regulator_enable_regmap,
105	.disable = regulator_disable_regmap,
106	.get_voltage_sel = regulator_get_voltage_sel_regmap,
107	.set_voltage_sel = regulator_set_voltage_sel_regmap,
108	.set_voltage_time_sel = max77686_set_dvs_voltage_time_sel,
109	};
110
111	#define regulator_desc_ldo(num) { \
112	.name = "LDO"#num, \
113	.id = MAX77686_LDO##num, \
114	.ops = &max77686_ops, \
115	.type = REGULATOR_VOLTAGE, \
116	.owner = THIS_MODULE, \
117	.min_uV = MAX77686_LDO_MINUV, \
118	.uV_step = MAX77686_LDO_UVSTEP, \
119	.n_voltages = MAX77686_VSEL_MASK + 1, \
120	.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
121	.vsel_mask = MAX77686_VSEL_MASK, \
122	.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
123	.enable_mask = MAX77686_OPMODE_MASK \
124	<< MAX77686_OPMODE_SHIFT, \
125	}
126	#define regulator_desc_ldo_low(num) { \
127	.name = "LDO"#num, \
128	.id = MAX77686_LDO##num, \
129	.ops = &max77686_ops, \
130	.type = REGULATOR_VOLTAGE, \
131	.owner = THIS_MODULE, \
132	.min_uV = MAX77686_LDO_LOW_MINUV, \
133	.uV_step = MAX77686_LDO_LOW_UVSTEP, \
134	.n_voltages = MAX77686_VSEL_MASK + 1, \
135	.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
136	.vsel_mask = MAX77686_VSEL_MASK, \
137	.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
138	.enable_mask = MAX77686_OPMODE_MASK \
139	<< MAX77686_OPMODE_SHIFT, \
140	}
141	#define regulator_desc_buck(num) { \
142	.name = "BUCK"#num, \
143	.id = MAX77686_BUCK##num, \
144	.ops = &max77686_ops, \
145	.type = REGULATOR_VOLTAGE, \
146	.owner = THIS_MODULE, \
147	.min_uV = MAX77686_BUCK_MINUV, \
148	.uV_step = MAX77686_BUCK_UVSTEP, \
149	.n_voltages = MAX77686_VSEL_MASK + 1, \
150	.vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
151	.vsel_mask = MAX77686_VSEL_MASK, \
152	.enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
153	.enable_mask = MAX77686_OPMODE_MASK, \
154	}
155	#define regulator_desc_buck1(num) { \
156	.name = "BUCK"#num, \
157	.id = MAX77686_BUCK##num, \
158	.ops = &max77686_ops, \
159	.type = REGULATOR_VOLTAGE, \
160	.owner = THIS_MODULE, \
161	.min_uV = MAX77686_BUCK_MINUV, \
162	.uV_step = MAX77686_BUCK_UVSTEP, \
163	.n_voltages = MAX77686_VSEL_MASK + 1, \
164	.vsel_reg = MAX77686_REG_BUCK1OUT, \
165	.vsel_mask = MAX77686_VSEL_MASK, \
166	.enable_reg = MAX77686_REG_BUCK1CTRL, \
167	.enable_mask = MAX77686_OPMODE_MASK, \
168	}
169	#define regulator_desc_buck_dvs(num) { \
170	.name = "BUCK"#num, \
171	.id = MAX77686_BUCK##num, \
172	.ops = &max77686_buck_dvs_ops, \
173	.type = REGULATOR_VOLTAGE, \
174	.owner = THIS_MODULE, \
175	.min_uV = MAX77686_DVS_MINUV, \
176	.uV_step = MAX77686_DVS_UVSTEP, \
177	.n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
178	.vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
179	.vsel_mask = MAX77686_DVS_VSEL_MASK, \
180	.enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
181	.enable_mask = MAX77686_OPMODE_MASK \
182	<< MAX77686_OPMODE_BUCK234_SHIFT, \
183	}
184
185	static struct regulator_desc regulators[] = {
186	regulator_desc_ldo_low(1),
187	regulator_desc_ldo_low(2),
188	regulator_desc_ldo(3),
189	regulator_desc_ldo(4),
190	regulator_desc_ldo(5),
191	regulator_desc_ldo_low(6),
192	regulator_desc_ldo_low(7),
193	regulator_desc_ldo_low(8),
194	regulator_desc_ldo(9),
195	regulator_desc_ldo(10),
196	regulator_desc_ldo(11),
197	regulator_desc_ldo(12),
198	regulator_desc_ldo(13),
199	regulator_desc_ldo(14),
200	regulator_desc_ldo_low(15),
201	regulator_desc_ldo(16),
202	regulator_desc_ldo(17),
203	regulator_desc_ldo(18),
204	regulator_desc_ldo(19),
205	regulator_desc_ldo(20),
206	regulator_desc_ldo(21),
207	regulator_desc_ldo(22),
208	regulator_desc_ldo(23),
209	regulator_desc_ldo(24),
210	regulator_desc_ldo(25),
211	regulator_desc_ldo(26),
212	regulator_desc_buck1(1),
213	regulator_desc_buck_dvs(2),
214	regulator_desc_buck_dvs(3),
215	regulator_desc_buck_dvs(4),
216	regulator_desc_buck(5),
217	regulator_desc_buck(6),
218	regulator_desc_buck(7),
219	regulator_desc_buck(8),
220	regulator_desc_buck(9),
221	};
222
223	static __devinit int max77686_pmic_probe(struct platform_device *pdev)
224	{
225	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
226	struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
227	struct regulator_dev **rdev;
228	struct max77686_data *max77686;
229	int i, size;
230	int ret = 0;
231	struct regulator_config config;
232
233	dev_dbg(&pdev->dev, "%s\n", __func__);
234
235	max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
236	GFP_KERNEL);
237	if (!max77686)
238	return -ENOMEM;
239
240	size = sizeof(struct regulator_dev ) MAX77686_REGULATORS;
241	max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
242	if (!max77686->rdev)
243	return -ENOMEM;
244
245	rdev = max77686->rdev;
246	max77686->dev = &pdev->dev;
247	max77686->iodev = iodev;
248	if (pdata)
249	max77686->num_regulators = pdata->num_regulators;
250	platform_set_drvdata(pdev, max77686);
251
252	max77686->ramp_delay = RAMP_RATE_NO_CTRL; /* Set 0x3 for RAMP */
253	regmap_update_bits(max77686->iodev->regmap,
254	MAX77686_REG_BUCK2CTRL1, MAX77686_RAMP_RATE_MASK,
255	max77686->ramp_delay << 6);
256	regmap_update_bits(max77686->iodev->regmap,
257	MAX77686_REG_BUCK3CTRL1, MAX77686_RAMP_RATE_MASK,
258	max77686->ramp_delay << 6);
259	regmap_update_bits(max77686->iodev->regmap,
260	MAX77686_REG_BUCK4CTRL1, MAX77686_RAMP_RATE_MASK,
261	max77686->ramp_delay << 6);
262
263	if (pdata->num_regulators == MAX77686_REGULATORS) {
264	for (i = 0; i < MAX77686_REGULATORS; i++) {
265	config.dev = max77686->dev;
266	config.regmap = iodev->regmap;
267	config.driver_data = max77686;
268	config.init_data = pdata->regulators[i].initdata;
269
270	rdev[i] = regulator_register(&regulators[i], &config);
271
272	if (IS_ERR(rdev[i])) {
273	ret = PTR_ERR(rdev[i]);
274	dev_err(max77686->dev,
275	"regulator init failed for %d\n", i);
276	rdev[i] = NULL;
277	goto err;
278	}
279	}
280	} else {
281	dev_err(max77686->dev,
282	"Lack of initial data for regulator's initialiation\n");
283	return -EINVAL;
284	}
285	return 0;
286	err:
287	for (i = 0; i < MAX77686_REGULATORS; i++) {
288	if (rdev[i])
289	regulator_unregister(rdev[i]);
290	}
291	return ret;
292	}
293
294	static int __devexit max77686_pmic_remove(struct platform_device *pdev)
295	{
296	struct max77686_data *max77686 = platform_get_drvdata(pdev);
297	struct regulator_dev **rdev = max77686->rdev;
298	int i;
299
300	for (i = 0; i < MAX77686_REGULATORS; i++)
301	if (rdev[i])
302	regulator_unregister(rdev[i]);
303
304	return 0;
305	}
306
307	static const struct platform_device_id max77686_pmic_id[] = {
308	{"max77686-pmic", 0},
309	{ },
310	};
311	MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
312
313	static struct platform_driver max77686_pmic_driver = {
314	.driver = {
315	.name = "max77686-pmic",
316	.owner = THIS_MODULE,
317	},
318	.probe = max77686_pmic_probe,
319	.remove = __devexit_p(max77686_pmic_remove),
320	.id_table = max77686_pmic_id,
321	};
322
323	static int __init max77686_pmic_init(void)
324	{
325	return platform_driver_register(&max77686_pmic_driver);
326	}
327	subsys_initcall(max77686_pmic_init);
328
329	static void __exit max77686_pmic_cleanup(void)
330	{
331	platform_driver_unregister(&max77686_pmic_driver);
332	}
333	module_exit(max77686_pmic_cleanup);
334
335	MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
336	MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
337	MODULE_LICENSE("GPL");