--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <dt-bindings/regulator/richtek,rt5190a-regulator.h>
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT5190A_REG_MANUFACTURE 0x00
+#define RT5190A_REG_BUCK2VSEL 0x04
+#define RT5190A_REG_BUCK3VSEL 0x05
+#define RT5190A_REG_DCDCCNTL 0x06
+#define RT5190A_REG_ENABLE 0x07
+#define RT5190A_REG_DISCHARGE 0x09
+#define RT5190A_REG_PROTMODE 0x0A
+#define RT5190A_REG_MUTECNTL 0x0B
+#define RT5190A_REG_PGSTAT 0x0F
+#define RT5190A_REG_OVINT 0x10
+#define RT5190A_REG_HOTDIEMASK 0x17
+
+#define RT5190A_VSEL_MASK GENMASK(6, 0)
+#define RT5190A_RID_BITMASK(rid) BIT(rid + 1)
+#define RT5190A_BUCK1_DISCHG_MASK GENMASK(1, 0)
+#define RT5190A_BUCK1_DISCHG_ONVAL 0x01
+#define RT5190A_OVERVOLT_MASK GENMASK(7, 0)
+#define RT5190A_UNDERVOLT_MASK GENMASK(15, 8)
+#define RT5190A_CH234OT_MASK BIT(29)
+#define RT5190A_CHIPOT_MASK BIT(28)
+
+#define RT5190A_BUCK23_MINUV 600000
+#define RT5190A_BUCK23_MAXUV 1400000
+#define RT5190A_BUCK23_STEPUV 10000
+#define RT5190A_BUCK23_STEPNUM ((1400000 - 600000) / 10000 + 1)
+
+enum {
+ RT5190A_IDX_BUCK1 = 0,
+ RT5190A_IDX_BUCK2,
+ RT5190A_IDX_BUCK3,
+ RT5190A_IDX_BUCK4,
+ RT5190A_IDX_LDO,
+ RT5190A_MAX_IDX
+};
+
+struct rt5190a_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator_desc rdesc[RT5190A_MAX_IDX];
+ struct regulator_dev *rdev[RT5190A_MAX_IDX];
+};
+
+static int rt5190a_get_error_flags(struct regulator_dev *rdev,
+ unsigned int *flags)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int rid = rdev_get_id(rdev);
+ unsigned int pgood_stat;
+ int ret;
+
+ ret = regmap_read(regmap, RT5190A_REG_PGSTAT, &pgood_stat);
+ if (ret)
+ return ret;
+
+ if (!(pgood_stat & RT5190A_RID_BITMASK(rid)))
+ *flags = REGULATOR_ERROR_FAIL;
+ else
+ *flags = 0;
+
+ return 0;
+}
+
+static int rt5190a_fixed_buck_set_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int rid = rdev_get_id(rdev);
+ unsigned int mask = RT5190A_RID_BITMASK(rid), val;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = mask;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT5190A_REG_DCDCCNTL, mask, val);
+}
+
+static unsigned int rt5190a_fixed_buck_get_mode(struct regulator_dev *rdev)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int rid = rdev_get_id(rdev);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(regmap, RT5190A_REG_DCDCCNTL, &val);
+ if (ret) {
+ dev_err(&rdev->dev, "Failed to get mode [%d]\n", ret);
+ return ret;
+ }
+
+ if (val & RT5190A_RID_BITMASK(rid))
+ return REGULATOR_MODE_FAST;
+
+ return REGULATOR_MODE_NORMAL;
+}
+
+static const struct regulator_ops rt5190a_ranged_buck_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .get_error_flags = rt5190a_get_error_flags,
+};
+
+static const struct regulator_ops rt5190a_fixed_buck_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_mode = rt5190a_fixed_buck_set_mode,
+ .get_mode = rt5190a_fixed_buck_get_mode,
+ .get_error_flags = rt5190a_get_error_flags,
+};
+
+static const struct regulator_ops rt5190a_fixed_ldo_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .get_error_flags = rt5190a_get_error_flags,
+};
+
+static irqreturn_t rt5190a_irq_handler(int irq, void *data)
+{
+ struct rt5190a_priv *priv = data;
+ __le32 raws;
+ unsigned int events, fields;
+ static const struct {
+ unsigned int bitmask;
+ unsigned int report;
+ } event_tbl[] = {
+ { RT5190A_OVERVOLT_MASK, REGULATOR_ERROR_REGULATION_OUT },
+ { RT5190A_UNDERVOLT_MASK, REGULATOR_ERROR_UNDER_VOLTAGE }
+ };
+ int i, j, ret;
+
+ ret = regmap_raw_read(priv->regmap, RT5190A_REG_OVINT, &raws,
+ sizeof(raws));
+ if (ret) {
+ dev_err(priv->dev, "Failed to read events\n");
+ return IRQ_NONE;
+ }
+
+ events = le32_to_cpu(raws);
+
+ ret = regmap_raw_write(priv->regmap, RT5190A_REG_OVINT, &raws,
+ sizeof(raws));
+ if (ret)
+ dev_err(priv->dev, "Failed to write-clear events\n");
+
+ /* Handle OV,UV events */
+ for (i = 0; i < ARRAY_SIZE(event_tbl); i++) {
+ fields = events & event_tbl[i].bitmask;
+ fields >>= ffs(event_tbl[i].bitmask) - 1;
+
+ for (j = 0; j < RT5190A_MAX_IDX; j++) {
+ if (!(fields & RT5190A_RID_BITMASK(j)))
+ continue;
+
+ regulator_notifier_call_chain(priv->rdev[j],
+ event_tbl[i].report,
+ NULL);
+ }
+ }
+
+ /* Handle CH234 OT event */
+ if (events & RT5190A_CH234OT_MASK) {
+ for (j = RT5190A_IDX_BUCK2; j < RT5190A_IDX_LDO; j++) {
+ regulator_notifier_call_chain(priv->rdev[j],
+ REGULATOR_ERROR_OVER_TEMP,
+ NULL);
+ }
+ }
+
+ /* Warning if CHIP OT occur */
+ if (events & RT5190A_CHIPOT_MASK)
+ dev_warn(priv->dev, "CHIP overheat\n");
+
+ return IRQ_HANDLED;
+}
+
+static unsigned int rt5190a_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case RT5190A_OPMODE_AUTO:
+ return REGULATOR_MODE_NORMAL;
+ case RT5190A_OPMODE_FPWM:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static int rt5190a_of_parse_cb(struct rt5190a_priv *priv, int rid,
+ struct of_regulator_match *match)
+{
+ struct regulator_desc *desc = priv->rdesc + rid;
+ struct regulator_init_data *init_data = match->init_data;
+ struct device_node *np = match->of_node;
+ bool latchup_enable;
+ unsigned int mask = RT5190A_RID_BITMASK(rid), val;
+
+ switch (rid) {
+ case RT5190A_IDX_BUCK1:
+ case RT5190A_IDX_BUCK4:
+ case RT5190A_IDX_LDO:
+ init_data->constraints.apply_uV = 0;
+
+ if (init_data->constraints.min_uV ==
+ init_data->constraints.max_uV)
+ desc->fixed_uV = init_data->constraints.min_uV;
+ else {
+ dev_err(priv->dev,
+ "Variable voltage for fixed regulator\n");
+ return -EINVAL;
+ }
+ break;
+ default:
+ break;
+ }
+
+ latchup_enable = of_property_read_bool(np, "richtek,latchup-enable");
+
+ /* latchup: 0, default hiccup: 1 */
+ val = !latchup_enable ? mask : 0;
+
+ return regmap_update_bits(priv->regmap, RT5190A_REG_PROTMODE, mask, val);
+}
+
+static void rt5190a_fillin_regulator_desc(struct regulator_desc *desc, int rid)
+{
+ static const char * const regu_name[] = { "buck1", "buck2",
+ "buck3", "buck4",
+ "ldo" };
+ static const char * const supply[] = { NULL, "vin2", "vin3", "vin4",
+ "vinldo" };
+
+ desc->name = regu_name[rid];
+ desc->supply_name = supply[rid];
+ desc->owner = THIS_MODULE;
+ desc->type = REGULATOR_VOLTAGE;
+ desc->id = rid;
+ desc->enable_reg = RT5190A_REG_ENABLE;
+ desc->enable_mask = RT5190A_RID_BITMASK(rid);
+ desc->active_discharge_reg = RT5190A_REG_DISCHARGE;
+ desc->active_discharge_mask = RT5190A_RID_BITMASK(rid);
+ desc->active_discharge_on = RT5190A_RID_BITMASK(rid);
+
+ switch (rid) {
+ case RT5190A_IDX_BUCK1:
+ desc->active_discharge_mask = RT5190A_BUCK1_DISCHG_MASK;
+ desc->active_discharge_on = RT5190A_BUCK1_DISCHG_ONVAL;
+ desc->n_voltages = 1;
+ desc->ops = &rt5190a_fixed_buck_ops;
+ desc->of_map_mode = rt5190a_of_map_mode;
+ break;
+ case RT5190A_IDX_BUCK2:
+ desc->vsel_reg = RT5190A_REG_BUCK2VSEL;
+ desc->vsel_mask = RT5190A_VSEL_MASK;
+ desc->min_uV = RT5190A_BUCK23_MINUV;
+ desc->uV_step = RT5190A_BUCK23_STEPUV;
+ desc->n_voltages = RT5190A_BUCK23_STEPNUM;
+ desc->ops = &rt5190a_ranged_buck_ops;
+ break;
+ case RT5190A_IDX_BUCK3:
+ desc->vsel_reg = RT5190A_REG_BUCK3VSEL;
+ desc->vsel_mask = RT5190A_VSEL_MASK;
+ desc->min_uV = RT5190A_BUCK23_MINUV;
+ desc->uV_step = RT5190A_BUCK23_STEPUV;
+ desc->n_voltages = RT5190A_BUCK23_STEPNUM;
+ desc->ops = &rt5190a_ranged_buck_ops;
+ break;
+ case RT5190A_IDX_BUCK4:
+ desc->n_voltages = 1;
+ desc->ops = &rt5190a_fixed_buck_ops;
+ desc->of_map_mode = rt5190a_of_map_mode;
+ break;
+ case RT5190A_IDX_LDO:
+ desc->n_voltages = 1;
+ desc->ops = &rt5190a_fixed_ldo_ops;
+ break;
+ }
+}
+
+static struct of_regulator_match rt5190a_regulator_match[] = {
+ { .name = "buck1", },
+ { .name = "buck2", },
+ { .name = "buck3", },
+ { .name = "buck4", },
+ { .name = "ldo", }
+};
+
+static int rt5190a_parse_regulator_dt_data(struct rt5190a_priv *priv)
+{
+ struct device_node *regulator_np;
+ struct regulator_desc *reg_desc;
+ struct of_regulator_match *match;
+ int i, ret;
+
+ for (i = 0; i < RT5190A_MAX_IDX; i++) {
+ reg_desc = priv->rdesc + i;
+ match = rt5190a_regulator_match + i;
+
+ rt5190a_fillin_regulator_desc(reg_desc, i);
+
+ match->desc = reg_desc;
+ }
+
+ regulator_np = of_get_child_by_name(priv->dev->of_node, "regulators");
+ if (!regulator_np) {
+ dev_err(priv->dev, "Could not find 'regulators' node\n");
+ return -ENODEV;
+ }
+
+ ret = of_regulator_match(priv->dev, regulator_np,
+ rt5190a_regulator_match,
+ ARRAY_SIZE(rt5190a_regulator_match));
+
+ of_node_put(regulator_np);
+
+ if (ret < 0) {
+ dev_err(priv->dev,
+ "Error parsing regulator init data: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < RT5190A_MAX_IDX; i++) {
+ match = rt5190a_regulator_match + i;
+
+ ret = rt5190a_of_parse_cb(priv, i, match);
+ if (ret) {
+ dev_err(priv->dev, "Failed in [%d] of_parse_cb\n", i);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct reg_sequence rt5190a_init_patch[] = {
+ { 0x09, 0x3d, },
+ { 0x0a, 0x3e, },
+ { 0x0b, 0x01, },
+ { 0x10, 0xff, },
+ { 0x11, 0xff, },
+ { 0x12, 0xff, },
+ { 0x13, 0xff, },
+ { 0x14, 0, },
+ { 0x15, 0, },
+ { 0x16, 0x3e, },
+ { 0x17, 0, }
+};
+
+static int rt5190a_device_initialize(struct rt5190a_priv *priv)
+{
+ bool mute_enable;
+ int ret;
+
+ ret = regmap_register_patch(priv->regmap, rt5190a_init_patch,
+ ARRAY_SIZE(rt5190a_init_patch));
+ if (ret) {
+ dev_err(priv->dev, "Failed to do register patch\n");
+ return ret;
+ }
+
+ mute_enable = device_property_read_bool(priv->dev,
+ "richtek,mute-enable");
+
+ if (mute_enable) {
+ ret = regmap_write(priv->regmap, RT5190A_REG_MUTECNTL, 0x00);
+ if (ret) {
+ dev_err(priv->dev, "Failed to enable mute function\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int rt5190a_device_check(struct rt5190a_priv *priv)
+{
+ u16 devid;
+ int ret;
+
+ ret = regmap_raw_read(priv->regmap, RT5190A_REG_MANUFACTURE, &devid,
+ sizeof(devid));
+ if (ret)
+ return ret;
+
+ if (devid) {
+ dev_err(priv->dev, "Incorrect device id 0x%04x\n", devid);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static const struct regmap_config rt5190a_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT5190A_REG_HOTDIEMASK,
+};
+
+static int rt5190a_probe(struct i2c_client *i2c)
+{
+ struct rt5190a_priv *priv;
+ struct regulator_config cfg = {};
+ int i, ret;
+
+ priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &i2c->dev;
+
+ priv->regmap = devm_regmap_init_i2c(i2c, &rt5190a_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ dev_err(&i2c->dev, "Failed to allocate regmap\n");
+ return PTR_ERR(priv->regmap);
+ }
+
+ ret = rt5190a_device_check(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to check device %d\n", ret);
+ return ret;
+ }
+
+ ret = rt5190a_device_initialize(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to initialize the device\n");
+ return ret;
+ }
+
+ ret = rt5190a_parse_regulator_dt_data(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to parse regulator dt\n");
+ return ret;
+ }
+
+ cfg.dev = &i2c->dev;
+ cfg.regmap = priv->regmap;
+
+ for (i = 0; i < RT5190A_MAX_IDX; i++) {
+ struct regulator_desc *desc = priv->rdesc + i;
+ struct of_regulator_match *match = rt5190a_regulator_match + i;
+
+ cfg.init_data = match->init_data;
+ cfg.of_node = match->of_node;
+
+ priv->rdev[i] = devm_regulator_register(&i2c->dev, desc, &cfg);
+ if (IS_ERR(priv->rdev[i])) {
+ dev_err(&i2c->dev, "Failed to register regulator %s\n",
+ desc->name);
+ return PTR_ERR(priv->rdev[i]);
+ }
+ }
+
+ if (i2c->irq) {
+ ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
+ rt5190a_irq_handler,
+ IRQF_ONESHOT,
+ dev_name(&i2c->dev), priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to register interrupt\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct of_device_id __maybe_unused rt5190a_device_table[] = {
+ { .compatible = "richtek,rt5190a", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt5190a_device_table);
+
+static struct i2c_driver rt5190a_driver = {
+ .driver = {
+ .name = "rt5190a",
+ .of_match_table = rt5190a_device_table,
+ },
+ .probe_new = rt5190a_probe,
+};
+module_i2c_driver(rt5190a_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_DESCRIPTION("Richtek RT5190A Regulator Driver");
+MODULE_LICENSE("GPL v2");
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