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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 five technologies GmbH
// Author: Markus Reichl <m.reichl@fivetechno.de>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/regulator/driver.h>
#include <linux/regmap.h>
#define VOL_MIN_IDX 0x00
#define VOL_MAX_IDX 0x7ff
/* Register definitions */
#define MP8859_VOUT_L_REG 0 //3 lo Bits
#define MP8859_VOUT_H_REG 1 //8 hi Bits
#define MP8859_VOUT_GO_REG 2
#define MP8859_IOUT_LIM_REG 3
#define MP8859_CTL1_REG 4
#define MP8859_CTL2_REG 5
#define MP8859_RESERVED1_REG 6
#define MP8859_RESERVED2_REG 7
#define MP8859_RESERVED3_REG 8
#define MP8859_STATUS_REG 9
#define MP8859_INTERRUPT_REG 0x0A
#define MP8859_MASK_REG 0x0B
#define MP8859_ID1_REG 0x0C
#define MP8859_MFR_ID_REG 0x27
#define MP8859_DEV_ID_REG 0x28
#define MP8859_IC_REV_REG 0x29
#define MP8859_MAX_REG 0x29
#define MP8859_GO_BIT 0x01
#define MP8859_ENABLE_MASK 0x80
#define MP8859_DISCHG_EN_MASK 0x10
#define MP8859_MODE_MASK 0x08
static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
int ret;
ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
if (ret)
return ret;
ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
if (ret)
return ret;
ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
MP8859_GO_BIT, 1);
return ret;
}
static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
{
unsigned int val_tmp;
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
if (ret)
return ret;
val = val_tmp << 3;
ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
if (ret)
return ret;
val |= val_tmp & 0x07;
return val;
}
static unsigned int mp8859_get_mode(struct regulator_dev *rdev)
{
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &val);
if (ret != 0) {
dev_err(&rdev->dev, "Failed to read mode: %d\n", ret);
return 0;
}
if (val & MP8859_MODE_MASK)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static int mp8859_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
unsigned int val;
switch (mode) {
case REGULATOR_MODE_FAST:
val = MP8859_MODE_MASK;
break;
case REGULATOR_MODE_NORMAL:
val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, MP8859_CTL1_REG,
MP8859_MODE_MASK, val);
}
static const struct linear_range mp8859_dcdc_ranges[] = {
REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
};
static bool mp8859_readable(struct device *dev, unsigned int reg)
{
switch (reg) {
case MP8859_VOUT_L_REG:
case MP8859_VOUT_H_REG:
case MP8859_VOUT_GO_REG:
case MP8859_IOUT_LIM_REG:
case MP8859_CTL1_REG:
case MP8859_CTL2_REG:
case MP8859_STATUS_REG:
case MP8859_INTERRUPT_REG:
case MP8859_MASK_REG:
case MP8859_ID1_REG:
case MP8859_MFR_ID_REG:
case MP8859_DEV_ID_REG:
case MP8859_IC_REV_REG:
return true;
default:
return false;
}
}
static bool mp8859_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case MP8859_VOUT_GO_REG:
case MP8859_STATUS_REG:
case MP8859_INTERRUPT_REG:
return true;
default:
return false;
}
}
static const struct regmap_config mp8859_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MP8859_MAX_REG,
.cache_type = REGCACHE_MAPLE,
.readable_reg = mp8859_readable,
.volatile_reg = mp8859_volatile,
};
static const struct regulator_ops mp8859_ops = {
.set_voltage_sel = mp8859_set_voltage_sel,
.get_voltage_sel = mp8859_get_voltage_sel,
.list_voltage = regulator_list_voltage_linear_range,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp8859_set_mode,
.get_mode = mp8859_get_mode,
.set_active_discharge = regulator_set_active_discharge_regmap,
};
static const struct regulator_desc mp8859_regulators[] = {
{
.id = 0,
.type = REGULATOR_VOLTAGE,
.name = "mp8859_dcdc",
.supply_name = "vin",
.of_match = of_match_ptr("mp8859_dcdc"),
.n_voltages = VOL_MAX_IDX + 1,
.linear_ranges = mp8859_dcdc_ranges,
.n_linear_ranges = 1,
.enable_reg = MP8859_CTL1_REG,
.enable_mask = MP8859_ENABLE_MASK,
.enable_val = MP8859_ENABLE_MASK,
.active_discharge_reg = MP8859_CTL1_REG,
.active_discharge_on = MP8859_DISCHG_EN_MASK,
.active_discharge_mask = MP8859_DISCHG_EN_MASK,
.ops = &mp8859_ops,
.owner = THIS_MODULE,
},
};
static int mp8859_i2c_probe(struct i2c_client *i2c)
{
int ret;
struct regulator_config config = {.dev = &i2c->dev};
struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
struct regulator_dev *rdev;
unsigned int val, rev;
if (IS_ERR(regmap)) {
ret = PTR_ERR(regmap);
dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
return ret;
}
ret = regmap_read(regmap, MP8859_MFR_ID_REG, &val);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to read manufacturer ID: %d\n", ret);
return ret;
}
if (val != 0x9) {
dev_err(&i2c->dev, "Manufacturer ID %x != 9\n", val);
return -EINVAL;
}
ret = regmap_read(regmap, MP8859_DEV_ID_REG, &val);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to read device ID: %d\n", ret);
return ret;
}
if (val != 0x58) {
dev_err(&i2c->dev, "Manufacturer ID %x != 0x58\n", val);
return -EINVAL;
}
ret = regmap_read(regmap, MP8859_IC_REV_REG, &rev);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to read device revision: %d\n", ret);
return ret;
}
ret = regmap_read(regmap, MP8859_ID1_REG, &val);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to read device ID1: %d\n", ret);
return ret;
}
dev_info(&i2c->dev, "MP8859-%04d revision %d\n", val, rev);
rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
&config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(&i2c->dev, "failed to register %s: %d\n",
mp8859_regulators[0].name, ret);
return ret;
}
return 0;
}
static const struct of_device_id mp8859_dt_id[] __maybe_unused = {
{.compatible = "mps,mp8859"},
{},
};
MODULE_DEVICE_TABLE(of, mp8859_dt_id);
static const struct i2c_device_id mp8859_i2c_id[] = {
{ "mp8859", },
{ },
};
MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
static struct i2c_driver mp8859_regulator_driver = {
.driver = {
.name = "mp8859",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(mp8859_dt_id),
},
.probe = mp8859_i2c_probe,
.id_table = mp8859_i2c_id,
};
module_i2c_driver(mp8859_regulator_driver);
MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
MODULE_LICENSE("GPL v2");
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