--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (c) 2025 Richtek Technology Corp.
+//
+// Author: ChiYuan Huang <cy_huang@richtek.com>
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT8092_REG_MNTRPT 0x00
+#define RT8092_REG_VOUTH 0x10
+#define RT8092_REG_VOUTL 0x11
+#define RT8092_REG_PWMMODE 0x14
+#define RT8092_REG_EVENT 0x18
+#define RT8092_REG_VBANKH 0x1C
+#define RT8092_REG_VBANKL 0x1D
+#define RT8092_REG_VBOUND 0x1E
+
+#define RT8092_TSDEVT_MASK BIT(7)
+#define RT8092_PGEVT_MASK BIT(0)
+#define RT8092_VSEL_MASK GENMASK(6, 0)
+#define RT8092_VOUTEN_MASK BIT(7)
+#define RT8092_FPWML_MASK BIT(7)
+#define RT8092_FPWMH_MASK BIT(6)
+#define RT8092_OCPEVT_MASK BIT(7)
+#define RT8092_SCPEVT_MASK BIT(4)
+#define RT8092_VINUVEVT_MASK BIT(1)
+#define RT8092_VBANK_MASK GENMASK(1, 0)
+
+#define RT8092_MODE_AUTO 0
+#define RT8092_MODE_FPWM 1
+#define RT8092_VOUT_BASEUV 303125
+#define RT8092_VOUT_STEPUV 3125
+#define RT8092_VOUT_MINSEL 15
+#define RT8092_NUM_VOLTS 128
+#define RT8092_INITSS_US 400
+
+static int rt8092_get_vbank_index(struct regmap *regmap, bool vsel_high, unsigned int *vbank_idx)
+{
+ unsigned int vbank_reg = vsel_high ? RT8092_REG_VBANKH : RT8092_REG_VBANKL;
+ unsigned int index;
+ int ret;
+
+ ret = regmap_read(regmap, vbank_reg, &index);
+ if (ret)
+ return ret;
+
+ *vbank_idx = FIELD_GET(RT8092_VBANK_MASK, index);
+ return 0;
+}
+
+static int rt8092_set_operating_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mode_mask, mode_val;
+
+ mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ mode_val = mode_mask;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ mode_val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val);
+}
+
+static unsigned int rt8092_get_operating_mode(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mode_mask, mode_val;
+ int ret;
+
+ mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK;
+
+ ret = regmap_read(regmap, RT8092_REG_PWMMODE, &mode_val);
+ if (ret)
+ return REGULATOR_MODE_INVALID;
+
+ return mode_val & mode_mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static int rt8092_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mntrpt, evtrpt, events = 0;
+ int ret;
+
+ ret = regmap_read(regmap, RT8092_REG_MNTRPT, &mntrpt);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(regmap, RT8092_REG_EVENT, &evtrpt);
+ if (ret)
+ return ret;
+
+ if (!(mntrpt & RT8092_PGEVT_MASK) || evtrpt & RT8092_VINUVEVT_MASK)
+ events |= REGULATOR_ERROR_UNDER_VOLTAGE;
+
+ if (mntrpt & RT8092_TSDEVT_MASK)
+ events |= REGULATOR_ERROR_OVER_TEMP;
+
+ if (evtrpt & RT8092_OCPEVT_MASK)
+ events |= REGULATOR_ERROR_OVER_CURRENT;
+
+ if (evtrpt & RT8092_SCPEVT_MASK)
+ events |= REGULATOR_ERROR_FAIL;
+
+ *flags = events;
+ return 0;
+}
+
+
+static int rt8092_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int vsel_reg, vsel_val, vbank_idx;
+ bool vsel_high;
+ int ret;
+
+ vsel_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
+ vsel_high = desc->vsel_reg == RT8092_REG_VOUTH;
+
+ ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx);
+ if (ret)
+ return ret;
+
+ /* VOUT = (BASEUV + STEPUV * VSEL) * 2^vbank_idx */
+ uV >>= vbank_idx;
+ if (uV < RT8092_VOUT_BASEUV)
+ return -EINVAL;
+
+ vsel_val = (uV - RT8092_VOUT_BASEUV) / RT8092_VOUT_STEPUV;
+ if (vsel_val < RT8092_VOUT_MINSEL || vsel_val >= RT8092_NUM_VOLTS)
+ return -EINVAL;
+
+ return regmap_update_bits(regmap, vsel_reg, RT8092_VSEL_MASK, vsel_val);
+}
+
+static int rt8092_set_suspend_enable(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int enable_reg;
+
+ enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
+ return regmap_set_bits(regmap, enable_reg, RT8092_VOUTEN_MASK);
+}
+
+static int rt8092_set_suspend_disable(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int enable_reg;
+
+ enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
+ return regmap_clear_bits(regmap, enable_reg, RT8092_VOUTEN_MASK);
+}
+
+static int rt8092_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mode_mask, mode_val;
+
+ mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWML_MASK : RT8092_FPWMH_MASK;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ mode_val = mode_mask;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ mode_val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val);
+}
+
+static const struct regulator_ops rt8092_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_mode = rt8092_set_operating_mode,
+ .get_mode = rt8092_get_operating_mode,
+ .get_error_flags = rt8092_get_error_flags,
+ .set_suspend_voltage = rt8092_set_suspend_voltage,
+ .set_suspend_enable = rt8092_set_suspend_enable,
+ .set_suspend_disable = rt8092_set_suspend_disable,
+ .set_suspend_mode = rt8092_set_suspend_mode,
+};
+
+static unsigned int rt8092_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case RT8092_MODE_AUTO:
+ return REGULATOR_MODE_NORMAL;
+ case RT8092_MODE_FPWM:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static const struct regmap_config rt8092_regmap_cfg = {
+ .name = "rt8092",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT8092_REG_VBOUND,
+};
+
+static int rt8092_probe(struct i2c_client *i2c)
+{
+ unsigned int vbank_idx, min_uV, step_uV;
+ struct regulator_config cfg = {};
+ struct device *dev = &i2c->dev;
+ struct regulator_desc *desc;
+ struct regulator_dev *rdev;
+ struct gpio_desc *enable;
+ struct regmap *regmap;
+ bool vsel_high;
+ int ret;
+
+ desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(enable))
+ return dev_err_probe(dev, PTR_ERR(enable), "Failed get 'enable' gpio\n");
+
+ regmap = devm_regmap_init_i2c(i2c, &rt8092_regmap_cfg);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+ vsel_high = device_property_read_bool(dev, "richtek,vsel-active-high");
+
+ ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to get VOUT bank index\n");
+
+ /*
+ * step VOUT = STEP_UV * 2^vbank_idx
+ * min VOUT = (BASEUV + STEPUV * VMIN_SEL) * 2^vbank_idx
+ */
+ step_uV = RT8092_VOUT_STEPUV << vbank_idx;
+ min_uV = (RT8092_VOUT_BASEUV + RT8092_VOUT_STEPUV * RT8092_VOUT_MINSEL) << vbank_idx;
+
+ desc->name = "rt8092";
+ desc->owner = THIS_MODULE;
+ desc->type = REGULATOR_VOLTAGE;
+ desc->ops = &rt8092_regulator_ops;
+ desc->n_voltages = RT8092_NUM_VOLTS;
+ desc->min_uV = min_uV;
+ desc->uV_step = step_uV;
+ desc->linear_min_sel = RT8092_VOUT_MINSEL;
+ desc->enable_reg = desc->vsel_reg = vsel_high ? RT8092_REG_VOUTH : RT8092_REG_VOUTL;
+ desc->vsel_mask = RT8092_VSEL_MASK;
+ desc->enable_mask = RT8092_VOUTEN_MASK;
+ desc->enable_time = RT8092_INITSS_US;
+ desc->of_map_mode = rt8092_of_map_mode;
+
+ cfg.dev = dev;
+ cfg.of_node = dev_of_node(dev);
+ cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
+
+ rdev = devm_regulator_register(dev, desc, &cfg);
+ if (IS_ERR(rdev))
+ return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n");
+
+ return 0;
+}
+
+static const struct of_device_id rt8092_device_tables[] = {
+ { .compatible = "richtek,rt8092" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt8092_device_tables);
+
+static struct i2c_driver rt8092_driver = {
+ .driver = {
+ .name = "rt8092",
+ .of_match_table = rt8092_device_tables,
+ },
+ .probe = rt8092_probe,
+};
+module_i2c_driver(rt8092_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_DESCRIPTION("Richtek RT8092 Regulator Driver");
+MODULE_LICENSE("GPL");
projects / thirdparty / kernel / linux.git / commitdiff
