path: root/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;
	u8                      buck1_vol[4]; /* voltages for selection */
	u8                      buck2_vol[2];
	unsigned int		buck1_idx; /* index to last changed voltage */
					   /* value in a set */
	unsigned int		buck2_idx;
};

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 </