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/*
* max77693.c - Regulator driver for the Maxim 77693
*
* Copyright (C) 2013 Samsung Electronics
* 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 max77686.c
*/
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
#define CHGIN_ILIM_STEP_20mA 20000
/* CHARGER regulator ops */
/* CHARGER regulator uses two bits for enabling */
static int max77693_chg_is_enabled(struct regulator_dev *rdev)
{
int ret;
unsigned int val;
ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
if (ret)
return ret;
return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
}
/*
* CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
* 0x00, 0x01, 0x2, 0x03 = 60 mA
* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
*/
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
unsigned int chg_min_uA = rdev->constraints->min_uA;
unsigned int chg_max_uA = rdev->constraints->max_uA;
unsigned int reg, sel;
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, ®);
if (ret < 0)
return ret;
sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
/* the first four codes for charger current are all 60mA */
if (sel <= 3)
sel = 0;
else
sel -= 3;
val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
if (val > chg_max_uA)
return -EINVAL;
return val;
}
static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
unsigned int chg_min_uA = rdev->constraints->min_uA;
int sel = 0;
while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
sel++;
if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
return -EINVAL;
/* the first four codes for charger current are all 60mA */
sel += 3;
return regmap_write(rdev->regmap,
MAX77693_CHG_REG_CHG_CNFG_09, sel);
}
/* end of CHARGER regulator ops */
static const unsigned int max77693_safeout_table[] = {
4850000,
4900000,
4950000,
3300000,
};
static struct regulator_ops max77693_safeout_ops = {
.list_voltage = regulator_list_voltage_table,
.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,
};
static struct regulator_ops max77693_charger_ops = {
.is_enabled = max77693_chg_is_enabled,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_current_limit = max77693_chg_get_current_limit,
.set_current_limit = max77693_chg_set_current_limit,
};
#define regulator_desc_esafeout(_num) { \
.name = "ESAFEOUT"#_num, \
.id = MAX77693_ESAFEOUT##_num, \
.of_match = of_match_ptr("ESAFEOUT"#_num), \
.regulators_node = of_match_ptr("regulators"), \
.n_voltages = 4, \
.ops = &max77693_safeout_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.volt_table = max77693_safeout_table, \
.vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
.vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
.enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
}
static const struct regulator_desc regulators[] = {
regulator_desc_esafeout(1),
regulator_desc_esafeout(2),
{
.name = "CHARGER",
.id = MAX77693_CHARGER,
.of_match = of_match_ptr("CHARGER"),
.regulators_node = of_match_ptr("regulators"),
.ops = &max77693_charger_ops,
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
.enable_mask = CHG_CNFG_00_CHG_MASK |
CHG_CNFG_00_BUCK_MASK,
},
};
static int max77693_pmic_probe(struct platform_device *pdev)
{
struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
int i;
struct regulator_config config = { };
config.dev = iodev->dev;
config.regmap = iodev->regmap;
for (i = 0; i < ARRAY_SIZE(regulators); i++) {
struct regulator_dev *rdev;
rdev = devm_regulator_register(&pdev->dev,
®ulators[i], &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"Failed to initialize regulator-%d\n", i);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id max77693_pmic_id[] = {
{"max77693-pmic", 0},
{},
};
MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
static struct platform_driver max77693_pmic_driver = {
.driver = {
.name = "max77693-pmic",
},
.probe = max77693_pmic_probe,
.id_table = max77693_pmic_id,
};
module_platform_driver(max77693_pmic_driver);
MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
MODULE_LICENSE("GPL");
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