// SPDX-License-Identifier: GPL-2.0+
//
// max77693.c - Regulator driver for the Maxim 77693 and 77843
//
// Copyright (C) 2013-2015 Samsung Electronics
// Jonghwa Lee <[email protected]>
// Krzysztof Kozlowski <[email protected]>
//
// 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-common.h>
#include <linux/mfd/max77693-private.h>
#include <linux/mfd/max77843-private.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
/*
* ID for MAX77843 regulators.
* There is no need for such for MAX77693.
*/
enum max77843_regulator_type {
MAX77843_SAFEOUT1 = 0,
MAX77843_SAFEOUT2,
MAX77843_CHARGER,
MAX77843_NUM,
};
/* Register differences between chargers: MAX77693 and MAX77843 */
struct chg_reg_data {
unsigned int linear_reg;
unsigned int linear_mask;
unsigned int uA_step;
unsigned int min_sel;
};
/*
* MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
* 0x00, 0x01, 0x2, 0x03 = 60 mA
* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
* Actually for MAX77693 the driver manipulates the maximum input current,
* not the fast charge current (output). This should be fixed.
*
* On MAX77843 the calculation formula is the same (except values).
* Fortunately it properly manipulates the fast charge current.
*/
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
const struct chg_reg_data *reg_data = rdev_get_drvdata(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, reg_data->linear_reg, ®);
if (ret < 0)
return ret;
sel = reg & reg_data->linear_mask;
/* the first four codes for charger current are all 60mA */
if (sel <= reg_data->min_sel)
sel = 0;
else
sel -= reg_data->min_sel;
val = chg_min_uA + reg_data->uA_step * 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)
{
const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
unsigned int chg_min_uA = rdev->constraints->min_uA;
int sel = 0;
while (chg_min_uA + reg_data->uA_step * sel < min_uA)
sel++;
if (chg_min_uA + reg_data->uA_step * sel > max_uA)
return -EINVAL;
/* the first four codes for charger current are all 60mA */
sel += reg_data->min_sel;
return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
}
/* end of CHARGER regulator ops */
/* Returns regmap suitable for given regulator on chosen device */
static struct regmap *max77693_get_regmap(enum max77693_types type,
struct max77693_dev *max77693,
int reg_id)
{
if (type == TYPE_MAX77693)
return max77693->regmap;
/* Else: TYPE_MAX77843 */
switch (reg_id) {
case MAX77843_SAFEOUT1:
case MAX77843_SAFEOUT2:
return max77693->regmap;
case MAX77843_CHARGER:
return max77693->regmap_chg;
default:
return max77693->regmap;
}
}
static const unsigned int max77693_safeout_table[] = {
4850000,
4900000,
4950000,
3300000,
};
static const 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 const struct regulator_ops max77693_charger_ops = {
.is_enabled = regulator_is_enabled_regmap,
.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 max77693_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 max77693_supported_regulators[] = {
max77693_regulator_desc_esafeout(1),
max77693_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,
.enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
},
};
static const struct chg_reg_data max77693_chg_reg_data = {
.linear_reg = MAX77693_CHG_REG_CHG_CNFG_09,
.linear_mask = CHG_CNFG_09_CHGIN_ILIM_MASK,
.uA_step = 20000,
.min_sel = 3,
};
#define max77843_regulator_desc_esafeout(num) { \
.name = "SAFEOUT" # num, \
.id = MAX77843_SAFEOUT ## num, \
.ops = &max77693_safeout_ops, \
.of_match = of_match_ptr("SAFEOUT" # num), \
.regulators_node = of_match_ptr("regulators"), \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(max77693_safeout_table), \
.volt_table = max77693_safeout_table, \
.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \
.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
}
static const struct regulator_desc max77843_supported_regulators[] = {
[MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
[MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
[MAX77843_CHARGER] = {
.name = "CHARGER",
.id = MAX77843_CHARGER,
.ops = &max77693_charger_ops,
.of_match = of_match_ptr("CHARGER"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_CURRENT,
.owner = THIS_MODULE,
.enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
.enable_mask = MAX77843_CHG_MASK,
.enable_val = MAX77843_CHG_MASK,
},
};
static const struct chg_reg_data max77843_chg_reg_data = {
.linear_reg = MAX77843_CHG_REG_CHG_CNFG_02,
.linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
.uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
.min_sel = 2,
};
static int max77693_pmic_probe(struct platform_device *pdev)
{
enum max77693_types type = platform_get_device_id(pdev)->driver_data;
struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
const struct regulator_desc *regulators;
unsigned int regulators_size;
int i;
struct regulator_config config = { };
config.dev = iodev->dev;
switch (type) {
case TYPE_MAX77693:
regulators = max77693_supported_regulators;
regulators_size = ARRAY_SIZE(max77693_supported_regulators);
config.driver_data = (void *)&max77693_chg_reg_data;
break;
case TYPE_MAX77843:
regulators = max77843_supported_regulators;
regulators_size = ARRAY_SIZE(max77843_supported_regulators);
config.driver_data = (void *)&max77843_chg_reg_data;
break;
default:
dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
return -ENODEV;
}
for (i = 0; i < regulators_size; i++) {
struct regulator_dev *rdev;
config.regmap = max77693_get_regmap(type, iodev,
regulators[i].id);
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", TYPE_MAX77693 },
{ "max77843-regulator", TYPE_MAX77843 },
{},
};
MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
static struct platform_driver max77693_pmic_driver = {
.driver = {
.name = "max77693-pmic",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = max77693_pmic_probe,
.id_table = max77693_pmic_id,
};
static int __init max77693_pmic_init(void)
{
return platform_driver_register(&max77693_pmic_driver);
}
subsys_initcall(max77693_pmic_init);
static void __exit max77693_pmic_cleanup(void)
{
platform_driver_unregister(&max77693_pmic_driver);
}
module_exit(max77693_pmic_cleanup);
MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <[email protected]>");
MODULE_AUTHOR("Krzysztof Kozlowski <[email protected]>");
MODULE_LICENSE("GPL");
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