path: root/drivers/regulator/max8997.c

/*
 * max8997.c - Regulator driver for the Maxim 8997/8966
 *
 * Copyright (C) 2011 Samsung Electronics
 * MyungJoo Ham <myungjoo.ham@smasung.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 max8998.c
 */

#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>

struct max8997_data {
	struct device *dev;
	struct max8997_dev *iodev;
	int num_regulators;
	struct regulator_dev **rdev;
	int ramp_delay; /* in mV/us */

	bool buck1_gpiodvs;
	bool buck2_gpiodvs;
	bool buck5_gpiodvs;
	u8 buck1_vol[8];
	u8 buck2_vol[8];
	u8 buck5_vol[8];
	int buck125_gpios[3];
	int buck125_gpioindex;
	bool ignore_gpiodvs_side_effect;

	u8 saved_states[MAX8997_REG_MAX];
};

static inline void max8997_set_gpio(struct max8997_data *max8997)
{
	int set3 = (max8997->buck125_gpioindex) & 0x1;
	int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
	int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;

	gpio_set_value(max8997->buck125_gpios[0], set1);
	gpio_set_value(max8997->buck125_gpios[1], set2);
	gpio_set_value(max8997->buck125_gpios[2], set3);
}

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

/* Voltage maps in mV */
static const struct voltage_map_desc ldo_voltage_map_desc = {
	.min = 800,	.max = 3950,	.step = 50,	.n_bits = 6,
}; /* LDO1 ~ 18, 21 all */

static const struct voltage_map_desc buck1245_voltage_map_desc = {
	.min = 650,	.max = 2225,	.step = 25,	.n_bits = 6,
}; /* Buck1, 2, 4, 5 */

static const struct voltage_map_desc buck37_voltage_map_desc = {
	.min = 750,	.max = 3900,	.step = 50,	.n_bits = 6,
}; /* Buck3, 7 */

/* current map in mA */
static const struct voltage_map_desc charger_current_map_desc = {
	.min = 200,	.max = 950,	.step = 50,	.n_bits = 4,
};

static const struct voltage_map_desc topoff_current_map_desc = {
	.min = 50,	.max = 200,	.step = 10