// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 five technologies GmbH
// Author: Markus Reichl <[email protected]>
#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_IOUT_LIM_MASK 0x7f
#define MP8859_ENABLE_MASK 0x80
#define MP8859_DISCHG_EN_MASK 0x10
#define MP8859_MODE_MASK 0x08
#define MP8859_PG_MASK 0x80
#define MP8859_OTP_MASK 0x40
#define MP8859_OTW_MASK 0x20
#define MP8859_CC_CV_MASK 0x10
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 int mp8859_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int from, unsigned int to)
{
int change;
/* The voltage ramps at 1mV/uS, selectors are 10mV */
if (from > to)
change = from - to;
else
change = to - from;
return change * 10 * 1000;
}
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 int mp8859_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
unsigned int cur_val, new_val;
int ret, i;
/* Steps of 50mA */
new_val = max_uA / 50000;
if (new_val > MP8859_IOUT_LIM_MASK)
return -EINVAL;
if (new_val == 0)
return -EINVAL;
/*
* If the regulator is limiting then ramp gradually as per
* datasheet, otherwise just set the value directly.
*/
ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &cur_val);
if (ret != 0)
return ret;
if (!(cur_val & MP8859_CC_CV_MASK)) {
return regmap_update_bits(rdev->regmap, MP8859_IOUT_LIM_REG,
MP8859_IOUT_LIM_MASK, new_val);
}
ret = regmap_read(rdev->regmap, MP8859_IOUT_LIM_REG, &cur_val);
if (ret != 0)
return ret;
if (cur_val >= new_val) {
for (i = cur_val; i >= new_val; i--) {
ret = regmap_update_bits(rdev->regmap,
MP8859_IOUT_LIM_REG,
MP8859_IOUT_LIM_MASK,
cur_val - i);
if (ret != 0)
return ret;
}
} else {
for (i = cur_val; i <= new_val; i++) {
ret = regmap_update_bits(rdev->regmap,
MP8859_IOUT_LIM_REG,
MP8859_IOUT_LIM_MASK,
cur_val + i);
if (ret != 0)
return ret;
}
}
return 0;
}
static int mp8859_get_status(struct regulator_dev *rdev)
{
unsigned int val;
int ret;
/* Output status is only meaingful when enabled */
ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &val);
if (ret != 0)
return ret;
if (!(val & MP8859_ENABLE_MASK))
return REGULATOR_STATUS_UNDEFINED;
ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &val);
if (ret != 0)
return ret;
if (val & MP8859_PG_MASK)
return REGULATOR_STATUS_ON;
else
return REGULATOR_STATUS_ERROR;
}
static int mp8859_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
unsigned int status, enabled;
int ret;
*flags = 0;
/* Output status is only meaingful when enabled */
ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &enabled);
if (ret != 0)
return ret;
enabled &= MP8859_ENABLE_MASK;
ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &status);
if (ret != 0)
return ret;
if (enabled && !(status & MP8859_PG_MASK))
status |= REGULATOR_ERROR_FAIL;
if (status & MP8859_OTP_MASK)
status |= REGULATOR_ERROR_OVER_TEMP;
if (status & MP8859_OTW_MASK)
status |= REGULATOR_ERROR_OVER_TEMP_WARN;
if (status & MP8859_CC_CV_MASK)
status |= REGULATOR_ERROR_OVER_CURRENT;
return 0;
}
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,
.set_voltage_time_sel = mp8859_set_voltage_time_sel,
.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,
.set_current_limit = mp8859_set_current_limit,
.get_status = mp8859_get_status,
.get_error_flags = mp8859_get_error_flags,
};
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 <[email protected]>");
MODULE_LICENSE("GPL v2");
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