[deliverable/linux.git] / drivers / regulator / max8998.c

/*
 * max8998.c - Voltage regulator driver for the Maxim 8998
 *
 *  Copyright (C) 2009-2010 Samsung Electronics
 *  Kyungmin Park <kyungmin.park@samsung.com>
 *  Marek Szyprowski <m.szyprowski@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
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>

struct max8998_data {
	struct device		*dev;
	struct max8998_dev	*iodev;
	int			num_regulators;
	struct regulator_dev	**rdev;
};

struct voltage_map_desc {
	int min;
	int max;
	int step;
};

/* Voltage maps */
static const struct voltage_map_desc ldo23_voltage_map_desc = {
	.min = 800,	.step = 50,	.max = 1300,
};
static const struct voltage_map_desc ldo456711_voltage_map_desc = {
	.min = 1600,	.step = 100,	.max = 3600,
};
static const struct voltage_map_desc ldo8_voltage_map_desc = {
	.min = 3000,	.step = 100,	.max = 3600,
};
static const struct voltage_map_desc ldo9_voltage_map_desc = {
	.min = 2800,	.step = 100,	.max = 3100,
};
static const struct voltage_map_desc ldo10_voltage_map_desc = {
	.min = 950,	.step = 50,	.max = 1300,
};
static const struct voltage_map_desc ldo1213_voltage_map_desc = {
	.min = 800,	.step = 100,	.max = 3300,
};
static const struct voltage_map_desc ldo1415_voltage_map_desc = {
	.min = 1200,	.step = 100,	.max = 3300,
};
static const struct voltage_map_desc ldo1617_voltage_map_desc = {
	.min = 1600,	.step = 100,	.max = 3600,
};
static const struct voltage_map_desc buck12_voltage_map_desc = {
	.min = 750,	.step = 25,	.max = 1525,
};
static const struct voltage_map_desc buck3_voltage_map_desc = {
	.min = 1600,	.step = 100,	.max = 3600,
};
static const struct voltage_map_desc buck4_voltage_map_desc = {
	.min = 800,	.step = 100,	.max = 2300,
};

static const struct voltage_map_desc *ldo_voltage_map[] = {
	NULL,
	NULL,
	&ldo23_voltage_map_desc,	/* LDO2 */
	&ldo23_voltage_map_desc,	/* LDO3 */
	&ldo456711_voltage_map_desc,	/* LDO4 */
	&ldo456711_voltage_map_desc,	/* LDO5 */
	&ldo456711_voltage_map_desc,	/* LDO6 */
	&ldo456711_voltage_map_desc,	/* LDO7 */
	&ldo8_voltage_map_desc,		/* LDO8 */
	&ldo9_voltage_map_desc,		/* LDO9 */
	&ldo10_voltage_map_desc,	/* LDO10 */
	&ldo456711_voltage_map_desc,	/* LDO11 */
	&ldo1213_voltage_map_desc,	/* LDO12 */
	&ldo1213_voltage_map_desc,	/* LDO13 */
	&ldo1415_voltage_map_desc,	/* LDO14 */
	&ldo1415_voltage_map_desc,	/* LDO15 */
	&ldo1617_voltage_map_desc,	/* LDO16 */
	&ldo1617_voltage_map_desc,	/* LDO17 */
	&buck12_voltage_map_desc,	/* BUCK1 */
	&buck12_voltage_map_desc,	/* BUCK2 */
	&buck3_voltage_map_desc,	/* BUCK3 */
	&buck4_voltage_map_desc,	/* BUCK4 */
};

static inline int max8998_get_ldo(struct regulator_dev *rdev)
{
	return rdev_get_id(rdev);
}

static int max8998_list_voltage(struct regulator_dev *rdev,
				unsigned int selector)
{
	const struct voltage_map_desc *desc;
	int ldo = max8998_get_ldo(rdev);
	int val;

	if (ldo >= ARRAY_SIZE(ldo_voltage_map))
		return -EINVAL;

	desc = ldo_voltage_map[ldo];
	if (desc == NULL)
		return -EINVAL;

	val = desc->min + desc->step * selector;
	if (val > desc->max)
		return -EINVAL;

	return val * 1000;
}

static int max8998_get_enable_register(struct regulator_dev *rdev,
					int *reg, int *shift)
{
	int ldo = max8998_get_ldo(rdev);

	switch (ldo) {
	case MAX8998_LDO2 ... MAX8998_LDO5:
		*reg = MAX8998_REG_ONOFF1;
		*shift = 3 - (ldo - MAX8998_LDO2);
		break;
	case MAX8998_LDO6 ... MAX8998_LDO13:
		*reg = MAX8998_REG_ONOFF2;
		*shift = 7 - (ldo - MAX8998_LDO6);
		break;
	case MAX8998_LDO14 ... MAX8998_LDO17:
		*reg = MAX8998_REG_ONOFF3;
		*shift = 7 - (ldo - MAX8998_LDO14);
		break;
	case MAX8998_BUCK1 ... MAX8998_BUCK4:
		*reg = MAX8998_REG_ONOFF1;
		*shift = 7 - (ldo - MAX8998_BUCK1);
		break;
	case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
		*reg = MAX8998_REG_ONOFF4;
		*shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
		break;
	case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
		*reg = MAX8998_REG_CHGR2;
		*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int ret, reg, shift = 8;
	u8 val;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
		return ret;

	ret = max8998_read_reg(i2c, reg, &val);
	if (ret)
		return ret;

	return val & (1 << shift);
}

static int max8998_ldo_enable(struct regulator_dev *rdev)
{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 8, ret;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
		return ret;

	return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
}

static int max8998_ldo_disable(struct regulator_dev *rdev)
{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 8, ret;

	ret = max8998_get_enable_register(rdev, &reg, &shift);
	if (ret)
		return ret;

	return max8998_update_reg(i2c, reg, 0, 1<<shift);
}

static int max8998_get_voltage_register(struct regulator_dev *rdev,
				int *_reg, int *_shift, int *_mask)
{
	int ldo = max8998_get_ldo(rdev);
	int reg, shift = 0, mask = 0xff;

	switch (ldo) {
	case MAX8998_LDO2 ... MAX8998_LDO3:
		reg = MAX8998_REG_LDO2_LDO3;
		mask = 0xf;
		if (ldo == MAX8998_LDO2)
			shift = 4;
		else
			shift = 0;
		break;
	case MAX8998_LDO4 ... MAX8998_LDO7:
		reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
		break;
	case MAX8998_LDO8 ... MAX8998_LDO9:
		reg = MAX8998_REG_LDO8_LDO9;
		mask = 0xf;
		if (ldo == MAX8998_LDO8)
			shift = 4;
		else
			shift = 0;
		break;
	case MAX8998_LDO10 ... MAX8998_LDO11:
		reg = MAX8998_REG_LDO10_LDO11;
		if (ldo == MAX8998_LDO10) {
			shift = 5;
			mask = 0x7;
		} else {
			shift = 0;
			mask = 0x1f;
		}
		break;
	case MAX8998_LDO12 ... MAX8998_LDO17:
		reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
		break;
	case MAX8998_BUCK1:
		reg = MAX8998_REG_BUCK1_DVSARM1;
		break;
	case MAX8998_BUCK2:
		reg = MAX8998_REG_BUCK2_DVSINT1;
		break;
	case MAX8998_BUCK3:
		reg = MAX8998_REG_BUCK3;
		break;
	case MAX8998_BUCK4:
		reg = MAX8998_REG_BUCK4;
		break;
	default:
		return -EINVAL;
	}

	*_reg = reg;
	*_shift = shift;
	*_mask = mask;

	return 0;
}

static int max8998_get_voltage(struct regulator_dev *rdev)
{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int reg, shift = 0, mask, ret;
	u8 val;

	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	if (ret)
		return ret;

	ret = max8998_read_reg(i2c, reg, &val);
	if (ret)
		return ret;

	val >>= shift;
	val &= mask;

	return max8998_list_voltage(rdev, val);
}

static int max8998_set_voltage(struct regulator_dev *rdev,
				int min_uV, int max_uV)
{
	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = max8998->iodev->i2c;
	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
	int previous_vol = 0;
	const struct voltage_map_desc *desc;
	int ldo = max8998_get_ldo(rdev);
	int reg, shift = 0, mask, ret;
	int i = 0;
	u8 val;
	bool en_ramp = false;

	if (ldo >= ARRAY_SIZE(ldo_voltage_map))
		return -EINVAL;

	desc = ldo_voltage_map[ldo];
	if (desc == NULL)
		return -EINVAL;

	if (max_vol < desc->min || min_vol > desc->max)
		return -EINVAL;

	while (desc->min + desc->step*i < min_vol &&
	       desc->min + desc->step*i < desc->max)
		i++;

	if (desc->min + desc->step*i > max_vol)
		return -EINVAL;

	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	if (ret)
		return ret;

	/* wait for RAMP_UP_DELAY if rdev is BUCK1/2 and
	 * ENRAMP is ON */
	if (ldo == MAX8998_BUCK1 || ldo == MAX8998_BUCK2) {
		max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
		if (val & (1 << 4)) {
			en_ramp = true;
			previous_vol = max8998_get_voltage(rdev);
		}
	}

	ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);

	if (en_ramp == true) {
		int difference = desc->min + desc->step*i - previous_vol/1000;
		if (difference > 0)
			udelay(difference / ((val & 0x0f) + 1));
	}

	return ret;
}

static struct regulator_ops max8998_ldo_ops = {
	.list_voltage		= max8998_list_voltage,
	.is_enabled		= max8998_ldo_is_enabled,
	.enable			= max8998_ldo_enable,
	.disable		= max8998_ldo_disable,
	.get_voltage		= max8998_get_voltage,
	.set_voltage		= max8998_set_voltage,
	.set_suspend_enable	= max8998_ldo_enable,
	.set_suspend_disable	= max8998_ldo_disable,
};

static struct regulator_ops max8998_buck_ops = {
	.list_voltage		= max8998_list_voltage,
	.is_enabled		= max8998_ldo_is_enabled,
	.enable			= max8998_ldo_enable,
	.disable		= max8998_ldo_disable,
	.get_voltage		= max8998_get_voltage,
	.set_voltage		= max8998_set_voltage,
	.set_suspend_enable	= max8998_ldo_enable,
	.set_suspend_disable	= max8998_ldo_disable,
};

static struct regulator_ops max8998_others_ops = {
	.is_enabled		= max8998_ldo_is_enabled,
	.enable			= max8998_ldo_enable,
	.disable		= max8998_ldo_disable,
	.set_suspend_enable	= max8998_ldo_enable,
	.set_suspend_disable	= max8998_ldo_disable,
};

static struct regulator_desc regulators[] = {
	{
		.name		= "LDO2",
		.id		= MAX8998_LDO2,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO3",
		.id		= MAX8998_LDO3,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO4",
		.id		= MAX8998_LDO4,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO5",
		.id		= MAX8998_LDO5,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO6",
		.id		= MAX8998_LDO6,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO7",
		.id		= MAX8998_LDO7,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO8",
		.id		= MAX8998_LDO8,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO9",
		.id		= MAX8998_LDO9,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO10",
		.id		= MAX8998_LDO10,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO11",
		.id		= MAX8998_LDO11,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO12",
		.id		= MAX8998_LDO12,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO13",
		.id		= MAX8998_LDO13,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO14",
		.id		= MAX8998_LDO14,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO15",
		.id		= MAX8998_LDO15,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO16",
		.id		= MAX8998_LDO16,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "LDO17",
		.id		= MAX8998_LDO17,
		.ops		= &max8998_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "BUCK1",
		.id		= MAX8998_BUCK1,
		.ops		= &max8998_buck_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "BUCK2",
		.id		= MAX8998_BUCK2,
		.ops		= &max8998_buck_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "BUCK3",
		.id		= MAX8998_BUCK3,
		.ops		= &max8998_buck_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "BUCK4",
		.id		= MAX8998_BUCK4,
		.ops		= &max8998_buck_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "EN32KHz AP",
		.id		= MAX8998_EN32KHZ_AP,
		.ops		= &max8998_others_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "EN32KHz CP",
		.id		= MAX8998_EN32KHZ_CP,
		.ops		= &max8998_others_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "ENVICHG",
		.id		= MAX8998_ENVICHG,
		.ops		= &max8998_others_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "ESAFEOUT1",
		.id		= MAX8998_ESAFEOUT1,
		.ops		= &max8998_others_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}, {
		.name		= "ESAFEOUT2",
		.id		= MAX8998_ESAFEOUT2,
		.ops		= &max8998_others_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
	}
};

static __devinit int max8998_pmic_probe(struct platform_device *pdev)
{
	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct regulator_dev **rdev;
	struct max8998_data *max8998;
	int i, ret, size;

	if (!pdata) {
		dev_err(pdev->dev.parent, "No platform init data supplied\n");
		return -ENODEV;
	}

	max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
	if (!max8998)
		return -ENOMEM;

	size = sizeof(struct regulator_dev *) * pdata->num_regulators;
	max8998->rdev = kzalloc(size, GFP_KERNEL);
	if (!max8998->rdev) {
		kfree(max8998);
		return -ENOMEM;
	}

	rdev = max8998->rdev;
	max8998->dev = &pdev->dev;
	max8998->iodev = iodev;
	max8998->num_regulators = pdata->num_regulators;
	platform_set_drvdata(pdev, max8998);

	for (i = 0; i < pdata->num_regulators; i++) {
		const struct voltage_map_desc *desc;
		int id = pdata->regulators[i].id;
		int index = id - MAX8998_LDO2;

		desc = ldo_voltage_map[id];
		if (desc && regulators[index].ops != &max8998_others_ops) {
			int count = (desc->max - desc->min) / desc->step + 1;
			regulators[index].n_voltages = count;
		}
		rdev[i] = regulator_register(&regulators[index], max8998->dev,
				pdata->regulators[i].initdata, max8998);
		if (IS_ERR(rdev[i])) {
			ret = PTR_ERR(rdev[i]);
			dev_err(max8998->dev, "regulator init failed\n");
			rdev[i] = NULL;
			goto err;
		}
	}


	return 0;
err:
	for (i = 0; i < max8998->num_regulators; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	kfree(max8998->rdev);
	kfree(max8998);

	return ret;
}

static int __devexit max8998_pmic_remove(struct platform_device *pdev)
{
	struct max8998_data *max8998 = platform_get_drvdata(pdev);
	struct regulator_dev **rdev = max8998->rdev;
	int i;

	for (i = 0; i < max8998->num_regulators; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	kfree(max8998->rdev);
	kfree(max8998);

	return 0;
}

static struct platform_driver max8998_pmic_driver = {
	.driver = {
		.name = "max8998-pmic",
		.owner = THIS_MODULE,
	},
	.probe = max8998_pmic_probe,
	.remove = __devexit_p(max8998_pmic_remove),
};

static int __init max8998_pmic_init(void)
{
	return platform_driver_register(&max8998_pmic_driver);
}
subsys_initcall(max8998_pmic_init);

static void __exit max8998_pmic_cleanup(void)
{
	platform_driver_unregister(&max8998_pmic_driver);
}
module_exit(max8998_pmic_cleanup);

MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
156f2528 KP	1	/*
	2	* max8998.c - Voltage regulator driver for the Maxim 8998
	3	*
	4	* Copyright (C) 2009-2010 Samsung Electronics
	5	* Kyungmin Park <kyungmin.park@samsung.com>
	6	* Marek Szyprowski <m.szyprowski@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
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/i2c.h>
	26	#include <linux/err.h>
	27	#include <linux/gpio.h>
	28	#include <linux/slab.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/mutex.h>
c5a4655d	31	#include <linux/delay.h>
156f2528 KP	32	#include <linux/platform_device.h>
	33	#include <linux/regulator/driver.h>
	34	#include <linux/mfd/max8998.h>
	35	#include <linux/mfd/max8998-private.h>
	36
	37	struct max8998_data {
	38	struct device *dev;
	39	struct max8998_dev *iodev;
	40	int num_regulators;
	41	struct regulator_dev **rdev;
	42	};
	43
	44	struct voltage_map_desc {
	45	int min;
	46	int max;
	47	int step;
	48	};
	49
	50	/* Voltage maps */
	51	static const struct voltage_map_desc ldo23_voltage_map_desc = {
	52	.min = 800, .step = 50, .max = 1300,
	53	};
	54	static const struct voltage_map_desc ldo456711_voltage_map_desc = {
	55	.min = 1600, .step = 100, .max = 3600,
	56	};
	57	static const struct voltage_map_desc ldo8_voltage_map_desc = {
	58	.min = 3000, .step = 100, .max = 3600,
	59	};
	60	static const struct voltage_map_desc ldo9_voltage_map_desc = {
	61	.min = 2800, .step = 100, .max = 3100,
	62	};
	63	static const struct voltage_map_desc ldo10_voltage_map_desc = {
	64	.min = 950, .step = 50, .max = 1300,
	65	};
	66	static const struct voltage_map_desc ldo1213_voltage_map_desc = {
	67	.min = 800, .step = 100, .max = 3300,
	68	};
	69	static const struct voltage_map_desc ldo1415_voltage_map_desc = {
	70	.min = 1200, .step = 100, .max = 3300,
	71	};
	72	static const struct voltage_map_desc ldo1617_voltage_map_desc = {
	73	.min = 1600, .step = 100, .max = 3600,
	74	};
	75	static const struct voltage_map_desc buck12_voltage_map_desc = {
	76	.min = 750, .step = 25, .max = 1525,
	77	};
	78	static const struct voltage_map_desc buck3_voltage_map_desc = {
	79	.min = 1600, .step = 100, .max = 3600,
	80	};
	81	static const struct voltage_map_desc buck4_voltage_map_desc = {
	82	.min = 800, .step = 100, .max = 2300,
	83	};
	84
	85	static const struct voltage_map_desc *ldo_voltage_map[] = {
	86	NULL,
	87	NULL,
	88	&ldo23_voltage_map_desc, /* LDO2 */
	89	&ldo23_voltage_map_desc, /* LDO3 */
	90	&ldo456711_voltage_map_desc, /* LDO4 */
	91	&ldo456711_voltage_map_desc, /* LDO5 */
	92	&ldo456711_voltage_map_desc, /* LDO6 */
	93	&ldo456711_voltage_map_desc, /* LDO7 */
	94	&ldo8_voltage_map_desc, /* LDO8 */
	95	&ldo9_voltage_map_desc, /* LDO9 */
96	&ldo10_voltage_map_desc, /* LDO10 */
97	&ldo456711_voltage_map_desc, /* LDO11 */
98	&ldo1213_voltage_map_desc, /* LDO12 */
99	&ldo1213_voltage_map_desc, /* LDO13 */
100	&ldo1415_voltage_map_desc, /* LDO14 */
101	&ldo1415_voltage_map_desc, /* LDO15 */
102	&ldo1617_voltage_map_desc, /* LDO16 */
103	&ldo1617_voltage_map_desc, /* LDO17 */
104	&buck12_voltage_map_desc, /* BUCK1 */
105	&buck12_voltage_map_desc, /* BUCK2 */
106	&buck3_voltage_map_desc, /* BUCK3 */
107	&buck4_voltage_map_desc, /* BUCK4 */
108	};
109
110	static inline int max8998_get_ldo(struct regulator_dev *rdev)
111	{
112	return rdev_get_id(rdev);
113	}
114
115	static int max8998_list_voltage(struct regulator_dev *rdev,
116	unsigned int selector)
117	{
118	const struct voltage_map_desc *desc;
119	int ldo = max8998_get_ldo(rdev);
120	int val;
121
1b69d8e3	122	if (ldo >= ARRAY_SIZE(ldo_voltage_map))
156f2528 KP	123	return -EINVAL;
	124
	125	desc = ldo_voltage_map[ldo];
	126	if (desc == NULL)
	127	return -EINVAL;
	128
	129	val = desc->min + desc->step * selector;
	130	if (val > desc->max)
	131	return -EINVAL;
	132
	133	return val * 1000;
	134	}
	135
	136	static int max8998_get_enable_register(struct regulator_dev *rdev,
	137	int reg, int shift)
	138	{
	139	int ldo = max8998_get_ldo(rdev);
	140
	141	switch (ldo) {
	142	case MAX8998_LDO2 ... MAX8998_LDO5:
	143	*reg = MAX8998_REG_ONOFF1;
	144	*shift = 3 - (ldo - MAX8998_LDO2);
	145	break;
	146	case MAX8998_LDO6 ... MAX8998_LDO13:
	147	*reg = MAX8998_REG_ONOFF2;
	148	*shift = 7 - (ldo - MAX8998_LDO6);
	149	break;
	150	case MAX8998_LDO14 ... MAX8998_LDO17:
	151	*reg = MAX8998_REG_ONOFF3;
	152	*shift = 7 - (ldo - MAX8998_LDO14);
	153	break;
	154	case MAX8998_BUCK1 ... MAX8998_BUCK4:
	155	*reg = MAX8998_REG_ONOFF1;
	156	*shift = 7 - (ldo - MAX8998_BUCK1);
	157	break;
	158	case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
	159	*reg = MAX8998_REG_ONOFF4;
	160	*shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
	161	break;
	162	case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
	163	*reg = MAX8998_REG_CHGR2;
	164	*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
	165	break;
	166	default:
	167	return -EINVAL;
	168	}
	169
	170	return 0;
	171	}
	172
	173	static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
	174	{
	175	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
676e02d7	176	struct i2c_client *i2c = max8998->iodev->i2c;
156f2528 KP	177	int ret, reg, shift = 8;
	178	u8 val;
	179
	180	ret = max8998_get_enable_register(rdev, &reg, &shift);
	181	if (ret)
	182	return ret;
	183
676e02d7	184	ret = max8998_read_reg(i2c, reg, &val);
156f2528 KP	185	if (ret)
	186	return ret;
	187
	188	return val & (1 << shift);
	189	}
	190
	191	static int max8998_ldo_enable(struct regulator_dev *rdev)
	192	{
	193	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
676e02d7	194	struct i2c_client *i2c = max8998->iodev->i2c;
156f2528 KP	195	int reg, shift = 8, ret;
	196
	197	ret = max8998_get_enable_register(rdev, &reg, &shift);
	198	if (ret)
	199	return ret;
	200
676e02d7	201	return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
156f2528 KP	202	}
	203
	204	static int max8998_ldo_disable(struct regulator_dev *rdev)
	205	{
	206	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
676e02d7	207	struct i2c_client *i2c = max8998->iodev->i2c;
156f2528 KP	208	int reg, shift = 8, ret;
	209
	210	ret = max8998_get_enable_register(rdev, &reg, &shift);
	211	if (ret)
	212	return ret;
	213
676e02d7	214	return max8998_update_reg(i2c, reg, 0, 1<<shift);
156f2528 KP	215	}
	216
	217	static int max8998_get_voltage_register(struct regulator_dev *rdev,
	218	int _reg, int _shift, int *_mask)
	219	{
	220	int ldo = max8998_get_ldo(rdev);
	221	int reg, shift = 0, mask = 0xff;
	222
	223	switch (ldo) {
	224	case MAX8998_LDO2 ... MAX8998_LDO3:
	225	reg = MAX8998_REG_LDO2_LDO3;
	226	mask = 0xf;
	227	if (ldo == MAX8998_LDO2)
	228	shift = 4;
	229	else
	230	shift = 0;
	231	break;
	232	case MAX8998_LDO4 ... MAX8998_LDO7:
	233	reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
	234	break;
	235	case MAX8998_LDO8 ... MAX8998_LDO9:
	236	reg = MAX8998_REG_LDO8_LDO9;
	237	mask = 0xf;
	238	if (ldo == MAX8998_LDO8)
	239	shift = 4;
	240	else
	241	shift = 0;
	242	break;
	243	case MAX8998_LDO10 ... MAX8998_LDO11:
	244	reg = MAX8998_REG_LDO10_LDO11;
	245	if (ldo == MAX8998_LDO10) {
	246	shift = 5;
	247	mask = 0x7;
	248	} else {
	249	shift = 0;
	250	mask = 0x1f;
	251	}
	252	break;
	253	case MAX8998_LDO12 ... MAX8998_LDO17:
	254	reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
	255	break;
	256	case MAX8998_BUCK1:
	257	reg = MAX8998_REG_BUCK1_DVSARM1;
	258	break;
	259	case MAX8998_BUCK2:
	260	reg = MAX8998_REG_BUCK2_DVSINT1;
	261	break;
	262	case MAX8998_BUCK3:
	263	reg = MAX8998_REG_BUCK3;
	264	break;
	265	case MAX8998_BUCK4:
	266	reg = MAX8998_REG_BUCK4;
	267	break;
	268	default:
	269	return -EINVAL;
	270	}
	271
	272	*_reg = reg;
	273	*_shift = shift;
	274	*_mask = mask;
	275
	276	return 0;
	277	}
	278
279	static int max8998_get_voltage(struct regulator_dev *rdev)
280	{
281	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
676e02d7	282	struct i2c_client *i2c = max8998->iodev->i2c;
156f2528 KP	283	int reg, shift = 0, mask, ret;
	284	u8 val;
	285
	286	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	287	if (ret)
	288	return ret;
	289
676e02d7	290	ret = max8998_read_reg(i2c, reg, &val);
156f2528 KP	291	if (ret)
	292	return ret;
	293
	294	val >>= shift;
	295	val &= mask;
	296
	297	return max8998_list_voltage(rdev, val);
	298	}
	299
	300	static int max8998_set_voltage(struct regulator_dev *rdev,
	301	int min_uV, int max_uV)
	302	{
	303	struct max8998_data *max8998 = rdev_get_drvdata(rdev);
676e02d7	304	struct i2c_client *i2c = max8998->iodev->i2c;
156f2528	305	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
c5a4655d	306	int previous_vol = 0;
156f2528 KP	307	const struct voltage_map_desc *desc;
	308	int ldo = max8998_get_ldo(rdev);
	309	int reg, shift = 0, mask, ret;
	310	int i = 0;
c5a4655d MH	311	u8 val;
c5a4655d MH	312	bool en_ramp = false;
156f2528	313
1b69d8e3	314	if (ldo >= ARRAY_SIZE(ldo_voltage_map))
156f2528 KP	315	return -EINVAL;
	316
	317	desc = ldo_voltage_map[ldo];
	318	if (desc == NULL)
	319	return -EINVAL;
	320
	321	if (max_vol < desc->min \|\| min_vol > desc->max)
	322	return -EINVAL;
	323
c5a4655d	324	while (desc->min + desc->step*i < min_vol &&
156f2528 KP	325	desc->min + desc->step*i < desc->max)
	326	i++;
	327
c5a4655d MH	328	if (desc->min + desc->step*i > max_vol)
	329	return -EINVAL;
	330
156f2528 KP	331	ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
	332	if (ret)
	333	return ret;
	334
c5a4655d MH	335	/* wait for RAMP_UP_DELAY if rdev is BUCK1/2 and
	336	* ENRAMP is ON */
	337	if (ldo == MAX8998_BUCK1 \|\| ldo == MAX8998_BUCK2) {
676e02d7	338	max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
c5a4655d MH	339	if (val & (1 << 4)) {
	340	en_ramp = true;
	341	previous_vol = max8998_get_voltage(rdev);
	342	}
	343	}
	344
676e02d7	345	ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
c5a4655d MH	346
	347	if (en_ramp == true) {
	348	int difference = desc->min + desc->step*i - previous_vol/1000;
	349	if (difference > 0)
	350	udelay(difference / ((val & 0x0f) + 1));
	351	}
	352
	353	return ret;
156f2528 KP	354	}
	355
	356	static struct regulator_ops max8998_ldo_ops = {
	357	.list_voltage = max8998_list_voltage,
	358	.is_enabled = max8998_ldo_is_enabled,
	359	.enable = max8998_ldo_enable,
	360	.disable = max8998_ldo_disable,
	361	.get_voltage = max8998_get_voltage,
	362	.set_voltage = max8998_set_voltage,
	363	.set_suspend_enable = max8998_ldo_enable,
	364	.set_suspend_disable = max8998_ldo_disable,
	365	};
	366
	367	static struct regulator_ops max8998_buck_ops = {
	368	.list_voltage = max8998_list_voltage,
	369	.is_enabled = max8998_ldo_is_enabled,
	370	.enable = max8998_ldo_enable,
	371	.disable = max8998_ldo_disable,
	372	.get_voltage = max8998_get_voltage,
	373	.set_voltage = max8998_set_voltage,
	374	.set_suspend_enable = max8998_ldo_enable,
	375	.set_suspend_disable = max8998_ldo_disable,
	376	};
	377
	378	static struct regulator_ops max8998_others_ops = {
	379	.is_enabled = max8998_ldo_is_enabled,
	380	.enable = max8998_ldo_enable,
	381	.disable = max8998_ldo_disable,
	382	.set_suspend_enable = max8998_ldo_enable,
	383	.set_suspend_disable = max8998_ldo_disable,
	384	};
	385
	386	static struct regulator_desc regulators[] = {
	387	{
	388	.name = "LDO2",
	389	.id = MAX8998_LDO2,
	390	.ops = &max8998_ldo_ops,
	391	.type = REGULATOR_VOLTAGE,
	392	.owner = THIS_MODULE,
	393	}, {
	394	.name = "LDO3",
	395	.id = MAX8998_LDO3,
	396	.ops = &max8998_ldo_ops,
	397	.type = REGULATOR_VOLTAGE,
	398	.owner = THIS_MODULE,
	399	}, {
	400	.name = "LDO4",
	401	.id = MAX8998_LDO4,
	402	.ops = &max8998_ldo_ops,
	403	.type = REGULATOR_VOLTAGE,
	404	.owner = THIS_MODULE,
	405	}, {
	406	.name = "LDO5",
	407	.id = MAX8998_LDO5,
	408	.ops = &max8998_ldo_ops,
	409	.type = REGULATOR_VOLTAGE,
	410	.owner = THIS_MODULE,
	411	}, {
	412	.name = "LDO6",
	413	.id = MAX8998_LDO6,
	414	.ops = &max8998_ldo_ops,
	415	.type = REGULATOR_VOLTAGE,
	416	.owner = THIS_MODULE,
	417	}, {
418	.name = "LDO7",
419	.id = MAX8998_LDO7,
420	.ops = &max8998_ldo_ops,
421	.type = REGULATOR_VOLTAGE,
422	.owner = THIS_MODULE,
423	}, {
424	.name = "LDO8",
425	.id = MAX8998_LDO8,
426	.ops = &max8998_ldo_ops,
427	.type = REGULATOR_VOLTAGE,
428	.owner = THIS_MODULE,
429	}, {
430	.name = "LDO9",
431	.id = MAX8998_LDO9,
432	.ops = &max8998_ldo_ops,
433	.type = REGULATOR_VOLTAGE,
434	.owner = THIS_MODULE,
435	}, {
436	.name = "LDO10",
437	.id = MAX8998_LDO10,
438	.ops = &max8998_ldo_ops,
439	.type = REGULATOR_VOLTAGE,
440	.owner = THIS_MODULE,
441	}, {
442	.name = "LDO11",
443	.id = MAX8998_LDO11,
444	.ops = &max8998_ldo_ops,
445	.type = REGULATOR_VOLTAGE,
446	.owner = THIS_MODULE,
447	}, {
448	.name = "LDO12",
449	.id = MAX8998_LDO12,
450	.ops = &max8998_ldo_ops,
451	.type = REGULATOR_VOLTAGE,
452	.owner = THIS_MODULE,
453	}, {
454	.name = "LDO13",
455	.id = MAX8998_LDO13,
456	.ops = &max8998_ldo_ops,
457	.type = REGULATOR_VOLTAGE,
458	.owner = THIS_MODULE,
459	}, {
460	.name = "LDO14",
461	.id = MAX8998_LDO14,
462	.ops = &max8998_ldo_ops,
463	.type = REGULATOR_VOLTAGE,
464	.owner = THIS_MODULE,
465	}, {
466	.name = "LDO15",
467	.id = MAX8998_LDO15,
468	.ops = &max8998_ldo_ops,
469	.type = REGULATOR_VOLTAGE,
470	.owner = THIS_MODULE,
471	}, {
472	.name = "LDO16",
473	.id = MAX8998_LDO16,
474	.ops = &max8998_ldo_ops,
475	.type = REGULATOR_VOLTAGE,
476	.owner = THIS_MODULE,
477	}, {
478	.name = "LDO17",
479	.id = MAX8998_LDO17,
480	.ops = &max8998_ldo_ops,
481	.type = REGULATOR_VOLTAGE,
482	.owner = THIS_MODULE,
483	}, {
484	.name = "BUCK1",
485	.id = MAX8998_BUCK1,
486	.ops = &max8998_buck_ops,
487	.type = REGULATOR_VOLTAGE,
488	.owner = THIS_MODULE,
489	}, {
490	.name = "BUCK2",
491	.id = MAX8998_BUCK2,
492	.ops = &max8998_buck_ops,
493	.type = REGULATOR_VOLTAGE,
494	.owner = THIS_MODULE,
495	}, {
496	.name = "BUCK3",
497	.id = MAX8998_BUCK3,
498	.ops = &max8998_buck_ops,
499	.type = REGULATOR_VOLTAGE,
500	.owner = THIS_MODULE,
501	}, {
502	.name = "BUCK4",
503	.id = MAX8998_BUCK4,
504	.ops = &max8998_buck_ops,
505	.type = REGULATOR_VOLTAGE,
506	.owner = THIS_MODULE,
507	}, {
508	.name = "EN32KHz AP",
509	.id = MAX8998_EN32KHZ_AP,
510	.ops = &max8998_others_ops,
511	.type = REGULATOR_VOLTAGE,
512	.owner = THIS_MODULE,
513	}, {
514	.name = "EN32KHz CP",
515	.id = MAX8998_EN32KHZ_CP,
516	.ops = &max8998_others_ops,
517	.type = REGULATOR_VOLTAGE,
518	.owner = THIS_MODULE,
519	}, {
520	.name = "ENVICHG",
521	.id = MAX8998_ENVICHG,
522	.ops = &max8998_others_ops,
523	.type = REGULATOR_VOLTAGE,
524	.owner = THIS_MODULE,
525	}, {
526	.name = "ESAFEOUT1",
527	.id = MAX8998_ESAFEOUT1,
528	.ops = &max8998_others_ops,
529	.type = REGULATOR_VOLTAGE,
530	.owner = THIS_MODULE,
531	}, {
532	.name = "ESAFEOUT2",
533	.id = MAX8998_ESAFEOUT2,
534	.ops = &max8998_others_ops,
535	.type = REGULATOR_VOLTAGE,
536	.owner = THIS_MODULE,
537	}
538	};
539
540	static __devinit int max8998_pmic_probe(struct platform_device *pdev)
541	{
542	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
543	struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
544	struct regulator_dev **rdev;
545	struct max8998_data *max8998;
546	int i, ret, size;
547
548	if (!pdata) {
549	dev_err(pdev->dev.parent, "No platform init data supplied\n");
550	return -ENODEV;
551	}
552
553	max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
554	if (!max8998)
555	return -ENOMEM;
556
11fa0d1d	557	size = sizeof(struct regulator_dev ) pdata->num_regulators;
156f2528 KP	558	max8998->rdev = kzalloc(size, GFP_KERNEL);
	559	if (!max8998->rdev) {
	560	kfree(max8998);
	561	return -ENOMEM;
	562	}
	563
	564	rdev = max8998->rdev;
747cc851	565	max8998->dev = &pdev->dev;
156f2528	566	max8998->iodev = iodev;
c356cbc2	567	max8998->num_regulators = pdata->num_regulators;
156f2528 KP	568	platform_set_drvdata(pdev, max8998);
	569
	570	for (i = 0; i < pdata->num_regulators; i++) {
	571	const struct voltage_map_desc *desc;
	572	int id = pdata->regulators[i].id;
	573	int index = id - MAX8998_LDO2;
	574
	575	desc = ldo_voltage_map[id];
	576	if (desc && regulators[index].ops != &max8998_others_ops) {
	577	int count = (desc->max - desc->min) / desc->step + 1;
	578	regulators[index].n_voltages = count;
	579	}
	580	rdev[i] = regulator_register(&regulators[index], max8998->dev,
	581	pdata->regulators[i].initdata, max8998);
	582	if (IS_ERR(rdev[i])) {
	583	ret = PTR_ERR(rdev[i]);
	584	dev_err(max8998->dev, "regulator init failed\n");
	585	rdev[i] = NULL;
	586	goto err;
	587	}
	588	}
	589
	590
	591	return 0;
	592	err:
11fa0d1d	593	for (i = 0; i < max8998->num_regulators; i++)
156f2528 KP	594	if (rdev[i])
	595	regulator_unregister(rdev[i]);
	596
	597	kfree(max8998->rdev);
	598	kfree(max8998);
	599
	600	return ret;
	601	}
	602
	603	static int __devexit max8998_pmic_remove(struct platform_device *pdev)
	604	{
	605	struct max8998_data *max8998 = platform_get_drvdata(pdev);
	606	struct regulator_dev **rdev = max8998->rdev;
	607	int i;
	608
11fa0d1d	609	for (i = 0; i < max8998->num_regulators; i++)
156f2528 KP	610	if (rdev[i])
	611	regulator_unregister(rdev[i]);
	612
	613	kfree(max8998->rdev);
	614	kfree(max8998);
	615
	616	return 0;
	617	}
	618
	619	static struct platform_driver max8998_pmic_driver = {
	620	.driver = {
	621	.name = "max8998-pmic",
	622	.owner = THIS_MODULE,
	623	},
	624	.probe = max8998_pmic_probe,
	625	.remove = __devexit_p(max8998_pmic_remove),
	626	};
	627
	628	static int __init max8998_pmic_init(void)
	629	{
	630	return platform_driver_register(&max8998_pmic_driver);
	631	}
	632	subsys_initcall(max8998_pmic_init);
	633
	634	static void __exit max8998_pmic_cleanup(void)
	635	{
	636	platform_driver_unregister(&max8998_pmic_driver);
	637	}
	638	module_exit(max8998_pmic_cleanup);
	639
	640	MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
	641	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	642	MODULE_LICENSE("GPL");