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// SPDX-License-Identifier: GPL-2.0
/*
* BQ257XX Battery Charger Driver
* Copyright (C) 2025 Chris Morgan <macromorgan@hotmail.com>
*/
#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/mfd/bq257xx.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
struct bq257xx_reg_data {
struct bq257xx_device *bq;
struct regulator_dev *bq257xx_reg;
struct gpio_desc *otg_en_gpio;
struct regulator_desc desc;
};
static int bq25703_vbus_get_cur_limit(struct regulator_dev *rdev)
{
struct bq257xx_reg_data *pdata = rdev_get_drvdata(rdev);
int ret;
unsigned int reg;
ret = regmap_read(pdata->bq->regmap, BQ25703_OTG_CURRENT, ®);
if (ret)
return ret;
return FIELD_GET(BQ25703_OTG_CUR_MASK, reg) * BQ25703_OTG_CUR_STEP_UA;
}
/*
* Check if the minimum current and maximum current requested are
* sane values, then set the register accordingly.
*/
static int bq25703_vbus_set_cur_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
struct bq257xx_reg_data *pdata = rdev_get_drvdata(rdev);
unsigned int reg;
if ((min_uA > BQ25703_OTG_CUR_MAX_UA) || (max_uA < 0))
return -EINVAL;
reg = (max_uA / BQ25703_OTG_CUR_STEP_UA);
/* Catch rounding errors since our step is 50000uA. */
if ((reg * BQ25703_OTG_CUR_STEP_UA) < min_uA)
return -EINVAL;
return regmap_write(pdata->bq->regmap, BQ25703_OTG_CURRENT,
FIELD_PREP(BQ25703_OTG_CUR_MASK, reg));
}
static int bq25703_vbus_enable(struct regulator_dev *rdev)
{
struct bq257xx_reg_data *pdata = rdev_get_drvdata(rdev);
if (pdata->otg_en_gpio)
gpiod_set_value_cansleep(pdata->otg_en_gpio, 1);
return regulator_enable_regmap(rdev);
}
static int bq25703_vbus_disable(struct regulator_dev *rdev)
{
struct bq257xx_reg_data *pdata = rdev_get_drvdata(rdev);
if (pdata->otg_en_gpio)
gpiod_set_value_cansleep(pdata->otg_en_gpio, 0);
return regulator_disable_regmap(rdev);
}
static const struct regulator_ops bq25703_vbus_ops = {
.enable = bq25703_vbus_enable,
.disable = bq25703_vbus_disable,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_current_limit = bq25703_vbus_get_cur_limit,
.set_current_limit = bq25703_vbus_set_cur_limit,
};
static const struct regulator_desc bq25703_vbus_desc = {
.name = "vbus",
.of_match = of_match_ptr("vbus"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.ops = &bq25703_vbus_ops,
.min_uV = BQ25703_OTG_VOLT_MIN_UV,
.uV_step = BQ25703_OTG_VOLT_STEP_UV,
.n_voltages = BQ25703_OTG_VOLT_NUM_VOLT,
.enable_mask = BQ25703_EN_OTG_MASK,
.enable_reg = BQ25703_CHARGE_OPTION_3,
.enable_val = BQ25703_EN_OTG_MASK,
.disable_val = 0,
.vsel_reg = BQ25703_OTG_VOLT,
.vsel_mask = BQ25703_OTG_VOLT_MASK,
};
/* Get optional GPIO for OTG regulator enable. */
static void bq257xx_reg_dt_parse_gpio(struct platform_device *pdev)
{
struct device_node *child, *subchild;
struct bq257xx_reg_data *pdata = platform_get_drvdata(pdev);
child = of_get_child_by_name(pdev->dev.of_node,
pdata->desc.regulators_node);
if (!child)
return;
subchild = of_get_child_by_name(child, pdata->desc.of_match);
if (!subchild)
return;
of_node_put(child);
pdata->otg_en_gpio = devm_fwnode_gpiod_get_index(&pdev->dev,
of_fwnode_handle(subchild),
"enable", 0,
GPIOD_OUT_LOW,
pdata->desc.of_match);
of_node_put(subchild);
if (IS_ERR(pdata->otg_en_gpio)) {
dev_err(&pdev->dev, "Error getting enable gpio: %ld\n",
PTR_ERR(pdata->otg_en_gpio));
return;
}
}
static int bq257xx_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct bq257xx_device *bq = dev_get_drvdata(pdev->dev.parent);
struct bq257xx_reg_data *pdata;
struct device_node *np = dev->of_node;
struct regulator_config cfg = {};
pdev->dev.of_node = pdev->dev.parent->of_node;
pdev->dev.of_node_reused = true;
pdata = devm_kzalloc(&pdev->dev, sizeof(struct bq257xx_reg_data), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->bq = bq;
pdata->desc = bq25703_vbus_desc;
platform_set_drvdata(pdev, pdata);
bq257xx_reg_dt_parse_gpio(pdev);
cfg.dev = &pdev->dev;
cfg.driver_data = pdata;
cfg.of_node = np;
cfg.regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!cfg.regmap)
return -ENODEV;
pdata->bq257xx_reg = devm_regulator_register(dev, &pdata->desc, &cfg);
if (IS_ERR(pdata->bq257xx_reg)) {
return dev_err_probe(&pdev->dev, PTR_ERR(pdata->bq257xx_reg),
"error registering bq257xx regulator");
}
return 0;
}
static struct platform_driver bq257xx_reg_driver = {
.driver = {
.name = "bq257xx-regulator",
},
.probe = bq257xx_regulator_probe,
};
module_platform_driver(bq257xx_reg_driver);
MODULE_DESCRIPTION("bq257xx regulator driver");
MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
MODULE_LICENSE("GPL");
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