linux/drivers/regulator/rt6245-regulator.c

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// SPDX-License-Identifier: GPL-2.0+
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define RT6245_VIRT_OCLIMIT 0x00
#define RT6245_VIRT_OTLEVEL 0x01
#define RT6245_VIRT_PGDLYTIME 0x02
#define RT6245_VIRT_SLEWRATE 0x03
#define RT6245_VIRT_SWFREQ 0x04
#define RT6245_VIRT_VOUT 0x05
#define RT6245_VOUT_MASK GENMASK(6, 0)
#define RT6245_SLEW_MASK GENMASK(2, 0)
#define RT6245_CHKSUM_MASK BIT(7)
#define RT6245_CODE_MASK GENMASK(6, 0)
/* HW Enable + Soft start time */
#define RT6245_ENTIME_IN_US 5000
#define RT6245_VOUT_MINUV 437500
#define RT6245_VOUT_MAXUV 1387500
#define RT6245_VOUT_STEPUV 12500
#define RT6245_NUM_VOUT ((RT6245_VOUT_MAXUV - RT6245_VOUT_MINUV) / RT6245_VOUT_STEPUV + 1)
struct rt6245_priv {
struct gpio_desc *enable_gpio;
bool enable_state;
};
static int rt6245_enable(struct regulator_dev *rdev)
{
struct rt6245_priv *priv = rdev_get_drvdata(rdev);
struct regmap *regmap = rdev_get_regmap(rdev);
int ret;
if (!priv->enable_gpio)
return 0;
gpiod_direction_output(priv->enable_gpio, 1);
usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
regcache_cache_only(regmap, false);
ret = regcache_sync(regmap);
if (ret)
return ret;
priv->enable_state = true;
return 0;
}
static int rt6245_disable(struct regulator_dev *rdev)
{
struct rt6245_priv *priv = rdev_get_drvdata(rdev);
struct regmap *regmap = rdev_get_regmap(rdev);
if (!priv->enable_gpio)
return -EINVAL;
regcache_cache_only(regmap, true);
regcache_mark_dirty(regmap);
gpiod_direction_output(priv->enable_gpio, 0);
priv->enable_state = false;
return 0;
}
static int rt6245_is_enabled(struct regulator_dev *rdev)
{
struct rt6245_priv *priv = rdev_get_drvdata(rdev);
return priv->enable_state ? 1 : 0;
}
static const struct regulator_ops rt6245_regulator_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.enable = rt6245_enable,
.disable = rt6245_disable,
.is_enabled = rt6245_is_enabled,
};
/* ramp delay dividend is 12500 uV/uS, and divisor from 1 to 8 */
static const unsigned int rt6245_ramp_delay_table[] = {
12500, 6250, 4167, 3125, 2500, 2083, 1786, 1562
};
static const struct regulator_desc rt6245_regulator_desc = {
.name = "rt6245-regulator",
.ops = &rt6245_regulator_ops,
.type = REGULATOR_VOLTAGE,
.min_uV = RT6245_VOUT_MINUV,
.uV_step = RT6245_VOUT_STEPUV,
.n_voltages = RT6245_NUM_VOUT,
.ramp_delay_table = rt6245_ramp_delay_table,
.n_ramp_values = ARRAY_SIZE(rt6245_ramp_delay_table),
.owner = THIS_MODULE,
.vsel_reg = RT6245_VIRT_VOUT,
.vsel_mask = RT6245_VOUT_MASK,
.ramp_reg = RT6245_VIRT_SLEWRATE,
.ramp_mask = RT6245_SLEW_MASK,
};
static int rt6245_init_device_properties(struct device *dev)
{
const struct {
const char *name;
unsigned int reg;
} rt6245_props[] = {
{ "richtek,oc-level-select", RT6245_VIRT_OCLIMIT },
{ "richtek,ot-level-select", RT6245_VIRT_OTLEVEL },
{ "richtek,pgdly-time-select", RT6245_VIRT_PGDLYTIME },
{ "richtek,switch-freq-select", RT6245_VIRT_SWFREQ }
};
struct regmap *regmap = dev_get_regmap(dev, NULL);
u8 propval;
int i, ret;
for (i = 0; i < ARRAY_SIZE(rt6245_props); i++) {
ret = device_property_read_u8(dev, rt6245_props[i].name, &propval);
if (ret)
continue;
ret = regmap_write(regmap, rt6245_props[i].reg, propval);
if (ret) {
dev_err(dev, "Fail to apply [%s:%d]\n", rt6245_props[i].name, propval);
return ret;
}
}
return 0;
}
static int rt6245_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct i2c_client *i2c = context;
static const u8 func_base[] = { 0x6F, 0x73, 0x78, 0x61, 0x7C, 0 };
unsigned int code, bit_count;
code = func_base[reg];
code += val;
/* xor checksum for bit 6 to 0 */
bit_count = hweight8(code & RT6245_CODE_MASK);
if (bit_count % 2)
code |= RT6245_CHKSUM_MASK;
else
code &= ~RT6245_CHKSUM_MASK;
return i2c_smbus_write_byte(i2c, code);
}
static const struct reg_default rt6245_reg_defaults[] = {
/* Default over current 14A */
{ RT6245_VIRT_OCLIMIT, 2 },
/* Default over temperature 150'c */
{ RT6245_VIRT_OTLEVEL, 0 },
/* Default power good delay time 10us */
{ RT6245_VIRT_PGDLYTIME, 1 },
/* Default slewrate 12.5mV/uS */
{ RT6245_VIRT_SLEWRATE, 0 },
/* Default switch frequency 800KHz */
{ RT6245_VIRT_SWFREQ, 1 },
/* Default voltage 750mV */
{ RT6245_VIRT_VOUT, 0x19 }
};
static const struct regmap_config rt6245_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT6245_VIRT_VOUT,
.cache_type = REGCACHE_FLAT,
.reg_defaults = rt6245_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(rt6245_reg_defaults),
.reg_write = rt6245_reg_write,
};
static int rt6245_probe(struct i2c_client *i2c)
{
struct rt6245_priv *priv;
struct regmap *regmap;
struct regulator_config regulator_cfg = {};
struct regulator_dev *rdev;
int ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->enable_state = true;
priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(priv->enable_gpio)) {
dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
return PTR_ERR(priv->enable_gpio);
}
usleep_range(RT6245_ENTIME_IN_US, RT6245_ENTIME_IN_US + 1000);
regmap = devm_regmap_init(&i2c->dev, NULL, i2c, &rt6245_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&i2c->dev, "Failed to initialize the regmap\n");
return PTR_ERR(regmap);
}
ret = rt6245_init_device_properties(&i2c->dev);
if (ret) {
dev_err(&i2c->dev, "Failed to initialize device properties\n");
return ret;
}
regulator_cfg.dev = &i2c->dev;
regulator_cfg.of_node = i2c->dev.of_node;
regulator_cfg.regmap = regmap;
regulator_cfg.driver_data = priv;
regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
&rt6245_regulator_desc);
rdev = devm_regulator_register(&i2c->dev, &rt6245_regulator_desc, &regulator_cfg);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to register regulator\n");
return PTR_ERR(rdev);
}
return 0;
}
static const struct of_device_id __maybe_unused rt6245_of_match_table[] = {
{ .compatible = "richtek,rt6245", },
{}
};
MODULE_DEVICE_TABLE(of, rt6245_of_match_table);
static struct i2c_driver rt6245_driver = {
.driver = {
.name = "rt6245",
.of_match_table = rt6245_of_match_table,
},
.probe_new = rt6245_probe,
};
module_i2c_driver(rt6245_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT6245 Regulator Driver");
MODULE_LICENSE("GPL v2");