153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// sy8106a-regulator.c - Regulator device driver for SY8106A
|
|
//
|
|
// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
|
|
// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
|
|
#define SY8106A_REG_VOUT1_SEL 0x01
|
|
#define SY8106A_REG_VOUT_COM 0x02
|
|
#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
|
|
#define SY8106A_DISABLE_REG BIT(0)
|
|
/*
|
|
* The I2C controlled voltage will only work when this bit is set; otherwise
|
|
* it will behave like a fixed regulator.
|
|
*/
|
|
#define SY8106A_GO_BIT BIT(7)
|
|
|
|
static const struct regmap_config sy8106a_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
};
|
|
|
|
static const struct regulator_ops sy8106a_ops = {
|
|
.set_voltage_sel = regulator_set_voltage_sel_regmap,
|
|
.set_voltage_time_sel = regulator_set_voltage_time_sel,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
/* Enabling/disabling the regulator is not yet implemented */
|
|
};
|
|
|
|
/* Default limits measured in millivolts */
|
|
#define SY8106A_MIN_MV 680
|
|
#define SY8106A_MAX_MV 1950
|
|
#define SY8106A_STEP_MV 10
|
|
|
|
static const struct regulator_desc sy8106a_reg = {
|
|
.name = "SY8106A",
|
|
.id = 0,
|
|
.ops = &sy8106a_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
|
|
.min_uV = (SY8106A_MIN_MV * 1000),
|
|
.uV_step = (SY8106A_STEP_MV * 1000),
|
|
.vsel_reg = SY8106A_REG_VOUT1_SEL,
|
|
.vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
|
|
/*
|
|
* This ramp_delay is a conservative default value which works on
|
|
* H3/H5 boards VDD-CPUX situations.
|
|
*/
|
|
.ramp_delay = 200,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/*
|
|
* I2C driver interface functions
|
|
*/
|
|
static int sy8106a_i2c_probe(struct i2c_client *i2c)
|
|
{
|
|
struct device *dev = &i2c->dev;
|
|
struct regulator_dev *rdev;
|
|
struct regulator_config config = { };
|
|
struct regmap *regmap;
|
|
unsigned int reg, vsel;
|
|
u32 fixed_voltage;
|
|
int error;
|
|
|
|
error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
|
|
&fixed_voltage);
|
|
if (error)
|
|
return error;
|
|
|
|
if (fixed_voltage < SY8106A_MIN_MV * 1000 ||
|
|
fixed_voltage > SY8106A_MAX_MV * 1000)
|
|
return -EINVAL;
|
|
|
|
regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
error = PTR_ERR(regmap);
|
|
dev_err(dev, "Failed to allocate register map: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
config.dev = &i2c->dev;
|
|
config.regmap = regmap;
|
|
|
|
config.of_node = dev->of_node;
|
|
config.init_data = of_get_regulator_init_data(dev, dev->of_node,
|
|
&sy8106a_reg);
|
|
|
|
if (!config.init_data)
|
|
return -ENOMEM;
|
|
|
|
/* Ensure GO_BIT is enabled when probing */
|
|
error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, ®);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!(reg & SY8106A_GO_BIT)) {
|
|
vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) /
|
|
SY8106A_STEP_MV;
|
|
|
|
error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL,
|
|
vsel | SY8106A_GO_BIT);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/* Probe regulator */
|
|
rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
|
|
if (IS_ERR(rdev)) {
|
|
error = PTR_ERR(rdev);
|
|
dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sy8106a_i2c_of_match[] = {
|
|
{ .compatible = "silergy,sy8106a" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);
|
|
|
|
static const struct i2c_device_id sy8106a_i2c_id[] = {
|
|
{ "sy8106a", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
|
|
|
|
static struct i2c_driver sy8106a_regulator_driver = {
|
|
.driver = {
|
|
.name = "sy8106a",
|
|
.of_match_table = sy8106a_i2c_of_match,
|
|
},
|
|
.probe_new = sy8106a_i2c_probe,
|
|
.id_table = sy8106a_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(sy8106a_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
|
|
MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
|
|
MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
|
|
MODULE_LICENSE("GPL");
|