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// SPDX-License-Identifier: GPL-2.0
//
// SY8827N regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define SY8827N_VSEL0 0
#define SY8827N_BUCK_EN (1 << 7)
#define SY8827N_MODE (1 << 6)
#define SY8827N_VSEL1 1
#define SY8827N_CTRL 2
#define SY8827N_ID1 3
#define SY8827N_ID2 4
#define SY8827N_PGOOD 5
#define SY8827N_MAX (SY8827N_PGOOD + 1)
#define SY8827N_NVOLTAGES 64
#define SY8827N_VSELMIN 600000
#define SY8827N_VSELSTEP 12500
struct sy8827n_device_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_init_data *regulator;
struct gpio_desc *en_gpio;
unsigned int vsel_reg;
};
static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(rdev->regmap, di->vsel_reg,
SY8827N_MODE, SY8827N_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(rdev->regmap, di->vsel_reg,
SY8827N_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
{
struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
u32 val;
int ret = 0;
ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
if (ret < 0)
return ret;
if (val & SY8827N_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static const struct regulator_ops sy8827n_regulator_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = sy8827n_set_mode,
.get_mode = sy8827n_get_mode,
};
static int sy8827n_regulator_register(struct sy8827n_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
struct regulator_dev *rdev;
rdesc->name = "sy8827n-reg";
rdesc->supply_name = "vin";
rdesc->ops = &sy8827n_regulator_ops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = SY8827N_NVOLTAGES;
rdesc->enable_reg = di->vsel_reg;
rdesc->enable_mask = SY8827N_BUCK_EN;
rdesc->min_uV = SY8827N_VSELMIN;
rdesc->uV_step = SY8827N_VSELSTEP;
rdesc->vsel_reg = di->vsel_reg;
rdesc->vsel_mask = rdesc->n_voltages - 1;
rdesc->owner = THIS_MODULE;
rdev = devm_regulator_register(di->dev, &di->desc, config);
return PTR_ERR_OR_ZERO(rdev);
}
static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
{
if (reg == SY8827N_PGOOD)
return true;
return false;
}
static const struct regmap_config sy8827n_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = sy8827n_volatile_reg,
.num_reg_defaults_raw = SY8827N_MAX,
.cache_type = REGCACHE_FLAT,
};
static int sy8827n_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
struct sy8827n_device_info *di;
struct regulator_config config = { };
struct regmap *regmap;
int ret;
di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
if (!di)
return -ENOMEM;
di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
if (!di->regulator) {
dev_err(dev, "Platform data not found!\n");
return -EINVAL;
}
di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(di->en_gpio))
return PTR_ERR(di->en_gpio);
if (of_property_read_bool(np, "silergy,vsel-state-high"))
di->vsel_reg = SY8827N_VSEL1;
else
di->vsel_reg = SY8827N_VSEL0;
di->dev = dev;
regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, di);
config.dev = di->dev;
config.init_data = di->regulator;
config.regmap = regmap;
config.driver_data = di;
config.of_node = np;
ret = sy8827n_regulator_register(di, &config);
if (ret < 0)
dev_err(dev, "Failed to register regulator!\n");
return ret;
}
static const struct of_device_id sy8827n_dt_ids[] = {
{
.compatible = "silergy,sy8827n",
},
{ }
};
MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
static const struct i2c_device_id sy8827n_id[] = {
{ "sy8827n", },
{ },
};
MODULE_DEVICE_TABLE(i2c, sy8827n_id);
static struct i2c_driver sy8827n_regulator_driver = {
.driver = {
.name = "sy8827n-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = sy8827n_dt_ids,
},
.probe = sy8827n_i2c_probe,
.id_table = sy8827n_id,
};
module_i2c_driver(sy8827n_regulator_driver);
MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("SY8827N regulator driver");
MODULE_LICENSE("GPL v2");
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