@@ -286,6 +286,14 @@ config REGULATOR_BD96801
This driver can also be built as a module. If so, the module
will be called bd96801-regulator.
+config REGULATOR_BQ257XX
+ tristate "TI BQ257XX regulator family"
+ depends on MFD_BQ257XX
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ Say Y to enable support for the boost regulator function of
+ the BQ257XX family of charger circuits.
+
config REGULATOR_CPCAP
tristate "Motorola CPCAP regulator"
depends on MFD_CPCAP
@@ -37,6 +37,7 @@ obj-$(CONFIG_REGULATOR_BD71828) += bd71828-regulator.o
obj-$(CONFIG_REGULATOR_BD718XX) += bd718x7-regulator.o
obj-$(CONFIG_REGULATOR_BD9571MWV) += bd9571mwv-regulator.o
obj-$(CONFIG_REGULATOR_BD957XMUF) += bd9576-regulator.o
+obj-$(CONFIG_REGULATOR_BQ257XX) += bq257xx-regulator.o
obj-$(CONFIG_REGULATOR_DA903X) += da903x-regulator.o
obj-$(CONFIG_REGULATOR_BD96801) += bd96801-regulator.o
obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
new file mode 100644
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0
+/* BQ257XX Battery Charger Driver
+ * Copyright (C) 2024 Chris Morgan <macromorgan@hotmail.com>
+ * Based off of BQ256XX Battery Charger driver and
+ * RK808 Regulator driver.
+ */
+
+#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 = "usb_otg_vbus",
+ .of_match = of_match_ptr("usb-otg-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_OR_NULL(pdata->otg_en_gpio)) {
+ dev_err(&pdev->dev, "Error getting enable gpio: %ld\n",
+ PTR_ERR(pdata->otg_en_gpio));
+ }
+}
+
+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_init_data *init_data;
+ struct regulator_config cfg = {};
+ int ret;
+
+ 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;
+
+ switch (pdata->bq->variant) {
+ case BQ25703A:
+ pdata->desc = bq25703_vbus_desc;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ platform_set_drvdata(pdev, pdata);
+ bq257xx_reg_dt_parse_gpio(pdev);
+
+ cfg.dev = &pdev->dev;
+ cfg.init_data = init_data;
+ 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 ret;
+}
+
+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");