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// SPDX-License-Identifier: GPL-2.0-or-later
//
// max77826-regulator.c - regulator driver for Maxim MAX77826
//
// Author: Iskren Chernev <iskren.chernev@gmail.com>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
enum max77826_registers {
MAX77826_REG_INT_SRC = 0x00,
MAX77826_REG_SYS_INT,
MAX77826_REG_INT1,
MAX77826_REG_INT2,
MAX77826_REG_BB_INT,
MAX77826_REG_INT_SRC_M,
MAX77826_REG_TOPSYS_INT_M,
MAX77826_REG_INT1_M,
MAX77826_REG_INT2_M,
MAX77826_REG_BB_INT_M,
MAX77826_REG_TOPSYS_STAT,
MAX77826_REG_STAT1,
MAX77826_REG_STAT2,
MAX77826_REG_BB_STAT,
/* 0x0E - 0x0F: Reserved */
MAX77826_REG_LDO_OPMD1 = 0x10,
MAX77826_REG_LDO_OPMD2,
MAX77826_REG_LDO_OPMD3,
MAX77826_REG_LDO_OPMD4,
MAX77826_REG_B_BB_OPMD,
/* 0x15 - 0x1F: Reserved */
MAX77826_REG_LDO1_CFG = 0x20,
MAX77826_REG_LDO2_CFG,
MAX77826_REG_LDO3_CFG,
MAX77826_REG_LDO4_CFG,
MAX77826_REG_LDO5_CFG,
MAX77826_REG_LDO6_CFG,
MAX77826_REG_LDO7_CFG,
MAX77826_REG_LDO8_CFG,
MAX77826_REG_LDO9_CFG,
MAX77826_REG_LDO10_CFG,
MAX77826_REG_LDO11_CFG,
MAX77826_REG_LDO12_CFG,
MAX77826_REG_LDO13_CFG,
MAX77826_REG_LDO14_CFG,
MAX77826_REG_LDO15_CFG,
/* 0x2F: Reserved */
MAX77826_REG_BUCK_CFG = 0x30,
MAX77826_REG_BUCK_VOUT,
MAX77826_REG_BB_CFG,
MAX77826_REG_BB_VOUT,
/* 0x34 - 0x3F: Reserved */
MAX77826_REG_BUCK_SS_FREQ = 0x40,
MAX77826_REG_UVLO_FALL,
/* 0x42 - 0xCE: Reserved */
MAX77826_REG_DEVICE_ID = 0xCF,
};
enum max77826_regulators {
MAX77826_LDO1 = 0,
MAX77826_LDO2,
MAX77826_LDO3,
MAX77826_LDO4,
MAX77826_LDO5,
MAX77826_LDO6,
MAX77826_LDO7,
MAX77826_LDO8,
MAX77826_LDO9,
MAX77826_LDO10,
MAX77826_LDO11,
MAX77826_LDO12,
MAX77826_LDO13,
MAX77826_LDO14,
MAX77826_LDO15,
MAX77826_BUCK,
MAX77826_BUCKBOOST,
MAX77826_MAX_REGULATORS,
};
#define MAX77826_MASK_LDO 0x7f
#define MAX77826_MASK_BUCK 0xff
#define MAX77826_MASK_BUCKBOOST 0x7f
#define MAX77826_BUCK_RAMP_DELAY 12500
/* values in mV */
/* for LDO1-3 */
#define MAX77826_NMOS_LDO_VOLT_MIN 600000
#define MAX77826_NMOS_LDO_VOLT_MAX 2187500
#define MAX77826_NMOS_LDO_VOLT_STEP 12500
/* for LDO4-15 */
#define MAX77826_PMOS_LDO_VOLT_MIN 800000
#define MAX77826_PMOS_LDO_VOLT_MAX 3975000
#define MAX77826_PMOS_LDO_VOLT_STEP 25000
/* for BUCK */
#define MAX77826_BUCK_VOLT_MIN 500000
#define MAX77826_BUCK_VOLT_MAX 1800000
#define MAX77826_BUCK_VOLT_STEP 6250
/* for BUCKBOOST */
#define MAX77826_BUCKBOOST_VOLT_MIN 2600000
#define MAX77826_BUCKBOOST_VOLT_MAX 4187500
#define MAX77826_BUCKBOOST_VOLT_STEP 12500
#define MAX77826_VOLT_RANGE(_type) \
((MAX77826_ ## _type ## _VOLT_MAX - \
MAX77826_ ## _type ## _VOLT_MIN) / \
MAX77826_ ## _type ## _VOLT_STEP + 1)
#define MAX77826_LDO(_id, _type) \
[MAX77826_LDO ## _id] = { \
.id = MAX77826_LDO ## _id, \
.name = "LDO"#_id, \
.of_match = of_match_ptr("LDO"#_id), \
.regulators_node = "regulators", \
.ops = &max77826_most_ops, \
.min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
.uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
.n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
.enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
.enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
.vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
.vsel_mask = MAX77826_MASK_LDO, \
.owner = THIS_MODULE, \
}
#define MAX77826_BUCK(_idx, _id, _ops) \
[MAX77826_ ## _id] = { \
.id = MAX77826_ ## _id, \
.name = #_id, \
.of_match = of_match_ptr(#_id), \
.regulators_node = "regulators", \
.ops = &_ops, \
.min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
.uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
.n_voltages = MAX77826_VOLT_RANGE(_id), \
.enable_reg = MAX77826_REG_B_BB_OPMD, \
.enable_mask = BIT(_idx * 2 + 1), \
.vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
.vsel_mask = MAX77826_MASK_ ## _id, \
.owner = THIS_MODULE, \
}
struct max77826_regulator_info {
struct regmap *regmap;
struct regulator_desc *rdesc;
};
static const struct regmap_config max77826_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77826_REG_DEVICE_ID,
};
static int max77826_set_voltage_time_sel(struct regulator_dev *,
unsigned int old_selector,
unsigned int new_selector);
static const struct regulator_ops max77826_most_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
static const struct regulator_ops max77826_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = max77826_set_voltage_time_sel,
};
static struct regulator_desc max77826_regulators_desc[] = {
MAX77826_LDO(1, NMOS),
MAX77826_LDO(2, NMOS),
MAX77826_LDO(3, NMOS),
MAX77826_LDO(4, PMOS),
MAX77826_LDO(5, PMOS),
MAX77826_LDO(6, PMOS),
MAX77826_LDO(7, PMOS),
MAX77826_LDO(8, PMOS),
MAX77826_LDO(9, PMOS),
MAX77826_LDO(10, PMOS),
MAX77826_LDO(11, PMOS),
MAX77826_LDO(12, PMOS),
MAX77826_LDO(13, PMOS),
MAX77826_LDO(14, PMOS),
MAX77826_LDO(15, PMOS),
MAX77826_BUCK(0, BUCK, max77826_buck_ops),
MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
};
static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
if (new_selector > old_selector) {
return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
(new_selector - old_selector),
MAX77826_BUCK_RAMP_DELAY);
}
return 0;
}
static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
{
unsigned int device_id;
int res;
res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
if (!res)
dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
return res;
}
static int max77826_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct max77826_regulator_info *info;
struct regulator_config config = {};
struct regulator_dev *rdev;
struct regmap *regmap;
int i;
info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->rdesc = max77826_regulators_desc;
regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
info->regmap = regmap;
i2c_set_clientdata(client, info);
config.dev = dev;
config.regmap = regmap;
config.driver_data = info;
for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
rdev = devm_regulator_register(dev,
&max77826_regulators_desc[i],
&config);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register regulator!\n");
return PTR_ERR(rdev);
}
}
return max77826_read_device_id(regmap, dev);
}
static const struct of_device_id __maybe_unused max77826_of_match[] = {
{ .compatible = "maxim,max77826" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max77826_of_match);
static const struct i2c_device_id max77826_id[] = {
{ "max77826-regulator" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, max77826_id);
static struct i2c_driver max77826_regulator_driver = {
.driver = {
.name = "max77826",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(max77826_of_match),
},
.probe = max77826_i2c_probe,
.id_table = max77826_id,
};
module_i2c_driver(max77826_regulator_driver);
MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
MODULE_LICENSE("GPL");
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