--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Richtek Technology Corp.
+ *
+ * Author: ChiYuan Huang <cy_huang@richtek.com>
+ *
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT6190_REG_VID 0x00
+#define RT6190_REG_OUTV 0x01
+#define RT6190_REG_OUTC 0x03
+#define RT6190_REG_SET1 0x0D
+#define RT6190_REG_SET2 0x0E
+#define RT6190_REG_SET4 0x10
+#define RT6190_REG_RATIO 0x11
+#define RT6190_REG_OUT_VOLT_L 0x12
+#define RT6190_REG_TEMP_H 0x1B
+#define RT6190_REG_STAT1 0x1C
+#define RT6190_REG_ALERT1 0x1E
+#define RT6190_REG_ALERT2 0x1F
+#define RT6190_REG_MASK2 0x21
+#define RT6190_REG_OCPEN 0x28
+#define RT6190_REG_SET5 0x29
+#define RT6190_REG_VBUSC_ADC 0x32
+#define RT6190_REG_BUSC_VOLT_L 0x33
+#define RT6190_REG_BUSC_VOLT_H 0x34
+#define RT6190_REG_STAT3 0x37
+#define RT6190_REG_ALERT3 0x38
+#define RT6190_REG_MASK3 0x39
+
+#define RT6190_ENPWM_MASK BIT(7)
+#define RT6190_ENDCHG_MASK BIT(4)
+#define RT6190_ALERT_OTPEVT BIT(6)
+#define RT6190_ALERT_UVPEVT BIT(5)
+#define RT6190_ALERT_OVPEVT BIT(4)
+#define RT6190_ENGCP_MASK BIT(1)
+#define RT6190_FCCM_MASK BIT(7)
+
+#define RICHTEK_VID 0x82
+#define RT6190_OUT_MIN_UV 3000000
+#define RT6190_OUT_MAX_UV 32000000
+#define RT6190_OUT_STEP_UV 20000
+#define RT6190_OUT_N_VOLT (RT6190_OUT_MAX_UV / RT6190_OUT_STEP_UV + 1)
+#define RT6190_OUTV_MINSEL 150
+#define RT6190_OUT_MIN_UA 306000
+#define RT6190_OUT_MAX_UA 12114000
+#define RT6190_OUT_STEP_UA 24000
+#define RT6190_OUTC_MINSEL 19
+#define RT6190_EN_TIME_US 500
+
+#define RT6190_PSM_MODE 0
+#define RT6190_FCCM_MODE 1
+
+struct rt6190_data {
+ struct device *dev;
+ struct regmap *regmap;
+ struct gpio_desc *enable_gpio;
+ unsigned int cached_alert_evt;
+};
+
+static int rt6190_out_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ __le16 le_sel = cpu_to_le16(selector);
+
+ return regmap_raw_write(regmap, RT6190_REG_OUTV, &le_sel,
+ sizeof(le_sel));
+}
+
+static int rt6190_out_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ __le16 le_sel;
+ int ret;
+
+ ret = regmap_raw_read(regmap, RT6190_REG_OUTV, &le_sel, sizeof(le_sel));
+
+ return ret ?: le16_to_cpu(le_sel);
+}
+
+static int rt6190_out_enable(struct regulator_dev *rdev)
+{
+ struct rt6190_data *data = rdev_get_drvdata(rdev);
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ u8 out_cfg[4];
+ int ret;
+
+ pm_runtime_get_sync(data->dev);
+
+ /*
+ * From off to on, vout config will restore to IC default.
+ * Read vout configs before enable, and restore them after enable
+ */
+ ret = regmap_raw_read(regmap, RT6190_REG_OUTV, out_cfg,
+ sizeof(out_cfg));
+ if (ret)
+ return ret;
+
+ ret = regulator_enable_regmap(rdev);
+ if (ret)
+ return ret;
+
+ ret = regmap_raw_write(regmap, RT6190_REG_OUTV, out_cfg,
+ sizeof(out_cfg));
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(regmap, RT6190_REG_SET5, RT6190_ENGCP_MASK,
+ RT6190_ENGCP_MASK);
+}
+
+static int rt6190_out_disable(struct regulator_dev *rdev)
+{
+ struct rt6190_data *data = rdev_get_drvdata(rdev);
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int ret;
+
+ ret = regmap_update_bits(regmap, RT6190_REG_SET5, RT6190_ENGCP_MASK, 0);
+ if (ret)
+ return ret;
+
+ ret = regulator_disable_regmap(rdev);
+ if (ret)
+ return ret;
+
+ /* cleared cached alert event */
+ data->cached_alert_evt = 0;
+
+ pm_runtime_put(data->dev);
+
+ return 0;
+}
+
+static int rt6190_out_set_current_limit(struct regulator_dev *rdev, int min_uA,
+ int max_uA)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int csel, clim;
+ __le16 le_csel;
+
+ if (min_uA < RT6190_OUT_MIN_UA || max_uA > RT6190_OUT_MAX_UA)
+ return -EINVAL;
+
+ csel = DIV_ROUND_UP(min_uA - RT6190_OUT_MIN_UA, RT6190_OUT_STEP_UA);
+
+ clim = RT6190_OUT_MIN_UA + RT6190_OUT_STEP_UA * csel;
+ if (clim > max_uA)
+ return -EINVAL;
+
+ csel += RT6190_OUTC_MINSEL;
+ le_csel = cpu_to_le16(csel);
+
+ return regmap_raw_write(regmap, RT6190_REG_OUTC, &le_csel,
+ sizeof(le_csel));
+}
+
+static int rt6190_out_get_current_limit(struct regulator_dev *rdev)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ __le16 le_csel;
+ int csel, ret;
+
+ ret = regmap_raw_read(regmap, RT6190_REG_OUTC, &le_csel,
+ sizeof(le_csel));
+ if (ret)
+ return ret;
+
+ csel = le16_to_cpu(le_csel);
+ csel -= RT6190_OUTC_MINSEL;
+
+ return RT6190_OUT_MIN_UA + RT6190_OUT_STEP_UA * csel;
+}
+
+static int rt6190_out_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int val;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = RT6190_FCCM_MASK;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT6190_REG_SET1, RT6190_FCCM_MASK,
+ val);
+}
+
+static unsigned int rt6190_out_get_mode(struct regulator_dev *rdev)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int config;
+ int ret;
+
+ ret = regmap_read(regmap, RT6190_REG_SET1, &config);
+ if (ret)
+ return REGULATOR_MODE_INVALID;
+
+ if (config & RT6190_FCCM_MASK)
+ return REGULATOR_MODE_FAST;
+
+ return REGULATOR_MODE_NORMAL;
+}
+
+static int rt6190_out_get_error_flags(struct regulator_dev *rdev,
+ unsigned int *flags)
+{
+ struct rt6190_data *data = rdev_get_drvdata(rdev);
+ unsigned int state, rpt_flags = 0;
+ int ret;
+
+ ret = regmap_read(data->regmap, RT6190_REG_STAT1, &state);
+ if (ret)
+ return ret;
+
+ state |= data->cached_alert_evt;
+
+ if (state & RT6190_ALERT_OTPEVT)
+ rpt_flags |= REGULATOR_ERROR_OVER_TEMP;
+
+ if (state & RT6190_ALERT_UVPEVT)
+ rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
+
+ if (state & RT6190_ALERT_OVPEVT)
+ rpt_flags |= REGULATOR_ERROR_REGULATION_OUT;
+
+ *flags = rpt_flags;
+
+ return 0;
+}
+
+static unsigned int rt6190_out_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case RT6190_PSM_MODE:
+ return REGULATOR_MODE_NORMAL;
+ case RT6190_FCCM_MODE:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static const struct regulator_ops rt6190_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = rt6190_out_set_voltage_sel,
+ .get_voltage_sel = rt6190_out_get_voltage_sel,
+ .enable = rt6190_out_enable,
+ .disable = rt6190_out_disable,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_current_limit = rt6190_out_set_current_limit,
+ .get_current_limit = rt6190_out_get_current_limit,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_mode = rt6190_out_set_mode,
+ .get_mode = rt6190_out_get_mode,
+ .get_error_flags = rt6190_out_get_error_flags,
+};
+
+static const struct regulator_desc rt6190_regulator_desc = {
+ .name = "rt6190-regulator",
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .ops = &rt6190_regulator_ops,
+ .min_uV = RT6190_OUT_MIN_UV,
+ .uV_step = RT6190_OUT_STEP_UV,
+ .n_voltages = RT6190_OUT_N_VOLT,
+ .linear_min_sel = RT6190_OUTV_MINSEL,
+ .enable_reg = RT6190_REG_SET2,
+ .enable_mask = RT6190_ENPWM_MASK,
+ .active_discharge_reg = RT6190_REG_SET2,
+ .active_discharge_mask = RT6190_ENDCHG_MASK,
+ .active_discharge_on = RT6190_ENDCHG_MASK,
+ .of_map_mode = rt6190_out_of_map_mode,
+};
+
+static bool rt6190_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case RT6190_REG_OUT_VOLT_L ... RT6190_REG_ALERT2:
+ case RT6190_REG_BUSC_VOLT_L ... RT6190_REG_BUSC_VOLT_H:
+ case RT6190_REG_STAT3 ... RT6190_REG_ALERT3:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config rt6190_regmap_config = {
+ .name = "rt6190",
+ .cache_type = REGCACHE_FLAT,
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT6190_REG_MASK3,
+ .num_reg_defaults_raw = RT6190_REG_MASK3 + 1,
+ .volatile_reg = rt6190_is_volatile_reg,
+};
+
+static irqreturn_t rt6190_irq_handler(int irq, void *devid)
+{
+ struct regulator_dev *rdev = devid;
+ struct rt6190_data *data = rdev_get_drvdata(rdev);
+ unsigned int alert;
+ int ret;
+
+ ret = regmap_read(data->regmap, RT6190_REG_ALERT1, &alert);
+ if (ret)
+ return IRQ_NONE;
+
+ /* Write clear alert events */
+ ret = regmap_write(data->regmap, RT6190_REG_ALERT1, alert);
+ if (ret)
+ return IRQ_NONE;
+
+ data->cached_alert_evt |= alert;
+
+ if (alert & RT6190_ALERT_OTPEVT)
+ regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_TEMP, NULL);
+
+ if (alert & RT6190_ALERT_UVPEVT)
+ regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE, NULL);
+
+ if (alert & RT6190_ALERT_OVPEVT)
+ regulator_notifier_call_chain(rdev, REGULATOR_EVENT_REGULATION_OUT, NULL);
+
+ return IRQ_HANDLED;
+}
+
+static int rt6190_init_registers(struct regmap *regmap)
+{
+ int ret;
+
+ /* Enable_ADC = 1 */
+ ret = regmap_write(regmap, RT6190_REG_SET4, 0x82);
+ if (ret)
+ return ret;
+
+ /* Config default VOUT ratio to be higher */
+ ret = regmap_write(regmap, RT6190_REG_RATIO, 0x20);
+
+ /* Mask unused alert */
+ ret = regmap_write(regmap, RT6190_REG_MASK2, 0);
+ if (ret)
+ return ret;
+
+ /* OCP config */
+ ret = regmap_write(regmap, RT6190_REG_OCPEN, 0);
+ if (ret)
+ return ret;
+
+ /* Enable VBUSC ADC */
+ return regmap_write(regmap, RT6190_REG_VBUSC_ADC, 0x02);
+}
+
+static int rt6190_probe(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct rt6190_data *data;
+ struct gpio_desc *enable_gpio;
+ struct regmap *regmap;
+ struct regulator_dev *rdev;
+ struct regulator_config cfg = {};
+ unsigned int vid;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(enable_gpio))
+ return dev_err_probe(dev, PTR_ERR(enable_gpio), "Failed to get 'enable' gpio\n");
+ else if (enable_gpio)
+ usleep_range(RT6190_EN_TIME_US, RT6190_EN_TIME_US * 2);
+
+ regmap = devm_regmap_init_i2c(i2c, &rt6190_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+ data->dev = dev;
+ data->enable_gpio = enable_gpio;
+ data->regmap = regmap;
+ i2c_set_clientdata(i2c, data);
+
+ ret = regmap_read(regmap, RT6190_REG_VID, &vid);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to read VID\n");
+
+ if (vid != RICHTEK_VID)
+ return dev_err_probe(dev, -ENODEV, "Incorrect VID 0x%02x\n", vid);
+
+ ret = rt6190_init_registers(regmap);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init registers\n");
+
+ pm_runtime_set_active(dev);
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to set pm_runtime enable\n");
+
+ cfg.dev = dev;
+ cfg.of_node = dev->of_node;
+ cfg.driver_data = data;
+ cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
+ &rt6190_regulator_desc);
+
+ rdev = devm_regulator_register(dev, &rt6190_regulator_desc, &cfg);
+ if (IS_ERR(rdev))
+ return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n");
+
+ if (i2c->irq) {
+ ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
+ rt6190_irq_handler,
+ IRQF_ONESHOT, dev_name(dev),
+ rdev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register interrupt\n");
+ }
+
+ return 0;
+}
+
+static int rt6190_runtime_suspend(struct device *dev)
+{
+ struct rt6190_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+
+ if (!data->enable_gpio)
+ return 0;
+
+ regcache_cache_only(regmap, true);
+ regcache_mark_dirty(regmap);
+
+ gpiod_set_value(data->enable_gpio, 0);
+
+ return 0;
+}
+
+static int rt6190_runtime_resume(struct device *dev)
+{
+ struct rt6190_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+
+ if (!data->enable_gpio)
+ return 0;
+
+ gpiod_set_value(data->enable_gpio, 1);
+ usleep_range(RT6190_EN_TIME_US, RT6190_EN_TIME_US * 2);
+
+ regcache_cache_only(regmap, false);
+ return regcache_sync(regmap);
+}
+
+static const struct dev_pm_ops __maybe_unused rt6190_dev_pm = {
+ RUNTIME_PM_OPS(rt6190_runtime_suspend, rt6190_runtime_resume, NULL)
+};
+
+static const struct of_device_id rt6190_of_dev_table[] = {
+ { .compatible = "richtek,rt6190" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt6190_of_dev_table);
+
+static struct i2c_driver rt6190_driver = {
+ .driver = {
+ .name = "rt6190",
+ .of_match_table = rt6190_of_dev_table,
+ .pm = pm_ptr(&rt6190_dev_pm),
+ },
+ .probe_new = rt6190_probe,
+};
+module_i2c_driver(rt6190_driver);
+
+MODULE_DESCRIPTION("Richtek RT6190 regulator driver");
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff