mirror of
https://github.com/physwizz/a155-U-u1.git
synced 2024-11-19 13:27:49 +00:00
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
// 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 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",
|
|
.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,
|
|
.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");
|