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// SPDX-License-Identifier: GPL-2.0
//
// SY8824C/SY8824E regulator driver
//
// Copyright (C) 2019 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>
#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 SY8824C_BUCK_EN (1 << 7)
#define SY8824C_MODE (1 << 6)
struct sy8824_config {
/* registers */
unsigned int vol_reg;
unsigned int mode_reg;
unsigned int enable_reg;
/* Voltage range and step(linear) */
unsigned int vsel_min;
unsigned int vsel_step;
unsigned int vsel_count;
const struct regmap_config *config;
};
struct sy8824_device_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_init_data *regulator;
const struct sy8824_config *cfg;
};
static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct sy8824_device_info *di = rdev_get_drvdata(rdev);
const struct sy8824_config *cfg = di->cfg;
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(rdev->regmap, cfg->mode_reg,
SY8824C_MODE, SY8824C_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(rdev->regmap, cfg->mode_reg,
SY8824C_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
{
struct sy8824_device_info *di = rdev_get_drvdata(rdev);
const struct sy8824_config *cfg = di->cfg;
u32 val;
int ret = 0;
ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
if (ret < 0)
return ret;
if (val & SY8824C_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static const struct regulator_ops sy8824_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 = sy8824_set_mode,
.get_mode = sy8824_get_mode,
};
static int sy8824_regulator_register(struct sy8824_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
const struct sy8824_config *cfg = di->cfg;
struct regulator_dev *rdev;
rdesc->name = "sy8824-reg";
rdesc->supply_name = "vin";
rdesc->ops = &sy8824_regulator_ops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = cfg->vsel_count;
rdesc->enable_reg = cfg->enable_reg;
rdesc->enable_mask = SY8824C_BUCK_EN;
rdesc->min_uV = cfg->vsel_min;
rdesc->uV_step = cfg->vsel_step;
rdesc->vsel_reg = cfg->vol_reg;
rdesc->vsel_mask = cfg->vsel_count - 1;
rdesc->owner = THIS_MODULE;
rdev = devm_regulator_register(di->dev, &di->desc, config);
return PTR_ERR_OR_ZERO(rdev);
}
static const struct regmap_config sy8824_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.num_reg_defaults_raw = 1,
.cache_type = REGCACHE_FLAT,
};
static const struct regmap_config sy20276_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.num_reg_defaults_raw = 2,
.cache_type = REGCACHE_FLAT,
};
static int sy8824_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
struct sy8824_device_info *di;
struct regulator_config config = { };
struct regmap *regmap;
int ret;
di = devm_kzalloc(dev, sizeof(struct sy8824_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->dev = dev;
di->cfg = of_device_get_match_data(dev);
regmap = devm_regmap_init_i2c(client, di->cfg->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 = sy8824_regulator_register(di, &config);
if (ret < 0)
dev_err(dev, "Failed to register regulator!\n");
return ret;
}
static const struct sy8824_config sy8824c_cfg = {
.vol_reg = 0x00,
.mode_reg = 0x00,
.enable_reg = 0x00,
.vsel_min = 762500,
.vsel_step = 12500,
.vsel_count = 64,
.config = &sy8824_regmap_config,
};
static const struct sy8824_config sy8824e_cfg = {
.vol_reg = 0x00,
.mode_reg = 0x00,
.enable_reg = 0x00,
.vsel_min = 700000,
.vsel_step = 12500,
.vsel_count = 64,
.config = &sy8824_regmap_config,
};
static const struct sy8824_config sy20276_cfg = {
.vol_reg = 0x00,
.mode_reg = 0x01,
.enable_reg = 0x01,
.vsel_min = 600000,
.vsel_step = 10000,
.vsel_count = 128,
.config = &sy20276_regmap_config,
};
static const struct sy8824_config sy20278_cfg = {
.vol_reg = 0x00,
.mode_reg = 0x01,
.enable_reg = 0x01,
.vsel_min = 762500,
.vsel_step = 12500,
.vsel_count = 64,
.config = &sy20276_regmap_config,
};
static const struct of_device_id sy8824_dt_ids[] = {
{
.compatible = "silergy,sy8824c",
.data = &sy8824c_cfg
},
{
.compatible = "silergy,sy8824e",
.data = &sy8824e_cfg
},
{
.compatible = "silergy,sy20276",
.data = &sy20276_cfg
},
{
.compatible = "silergy,sy20278",
.data = &sy20278_cfg
},
{ }
};
MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
static const struct i2c_device_id sy8824_id[] = {
{ "sy8824", },
{ },
};
MODULE_DEVICE_TABLE(i2c, sy8824_id);
static struct i2c_driver sy8824_regulator_driver = {
.driver = {
.name = "sy8824-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = sy8824_dt_ids,
},
.probe = sy8824_i2c_probe,
.id_table = sy8824_id,
};
module_i2c_driver(sy8824_regulator_driver);
MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
MODULE_LICENSE("GPL v2");
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