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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
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 const struct regulator_linear_range mp8859_dcdc_ranges[] = {
REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
};
static const struct regmap_config mp8859_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MP8859_MAX_REG,
.cache_type = REGCACHE_RBTREE,
};
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,
};
static const struct regulator_desc mp8859_regulators[] = {
{
.id = 0,
.type = REGULATOR_VOLTAGE,
.name = "mp8859_dcdc",
.of_match = of_match_ptr("mp8859_dcdc"),
.n_voltages = VOL_MAX_IDX + 1,
.linear_ranges = mp8859_dcdc_ranges,
.n_linear_ranges = 1,
.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;
if (IS_ERR(regmap)) {
ret = PTR_ERR(regmap);
dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
return ret;
}
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[] = {
{.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",
.of_match_table = of_match_ptr(mp8859_dt_id),
},
.probe_new = 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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