--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT5759_REG_VENDORINFO 0x00
+#define RT5759_REG_FREQ 0x01
+#define RT5759_REG_VSEL 0x02
+#define RT5759_REG_DCDCCTRL 0x03
+#define RT5759_REG_STATUS 0x04
+#define RT5759_REG_DCDCSET 0x05
+#define RT5759A_REG_WDTEN 0x42
+
+#define RT5759_TSTEP_MASK GENMASK(3, 2)
+#define RT5759_VSEL_MASK GENMASK(6, 0)
+#define RT5759_DISCHARGE_MASK BIT(3)
+#define RT5759_FPWM_MASK BIT(2)
+#define RT5759_ENABLE_MASK BIT(1)
+#define RT5759_OT_MASK BIT(1)
+#define RT5759_UV_MASK BIT(0)
+#define RT5957_OCLVL_MASK GENMASK(7, 6)
+#define RT5759_OCLVL_SHIFT 6
+#define RT5957_OTLVL_MASK GENMASK(5, 4)
+#define RT5759_OTLVL_SHIFT 4
+#define RT5759A_WDTEN_MASK BIT(1)
+
+#define RT5759_MANUFACTURER_ID 0x82
+/* vsel range 0x00 ~ 0x5A */
+#define RT5759_NUM_VOLTS 91
+#define RT5759_MIN_UV 600000
+#define RT5759_STEP_UV 10000
+#define RT5759A_STEP_UV 12500
+#define RT5759_MINSS_TIMEUS 1500
+
+#define RT5759_PSKIP_MODE 0
+#define RT5759_FPWM_MODE 1
+
+enum {
+ CHIP_TYPE_RT5759 = 0,
+ CHIP_TYPE_RT5759A,
+ CHIP_TYPE_MAX
+};
+
+struct rt5759_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator_desc desc;
+ unsigned long chip_type;
+};
+
+static int rt5759_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mode_val;
+
+ switch (mode) {
+ case REGULATOR_MODE_NORMAL:
+ mode_val = 0;
+ break;
+ case REGULATOR_MODE_FAST:
+ mode_val = RT5759_FPWM_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK,
+ mode_val);
+}
+
+static unsigned int rt5759_get_mode(struct regulator_dev *rdev)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, ®val);
+ if (ret)
+ return REGULATOR_MODE_INVALID;
+
+ if (regval & RT5759_FPWM_MASK)
+ return REGULATOR_MODE_FAST;
+
+ return REGULATOR_MODE_NORMAL;
+}
+
+static int rt5759_get_error_flags(struct regulator_dev *rdev,
+ unsigned int *flags)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int status, events = 0;
+ int ret;
+
+ ret = regmap_read(regmap, RT5759_REG_STATUS, &status);
+ if (ret)
+ return ret;
+
+ if (status & RT5759_OT_MASK)
+ events |= REGULATOR_ERROR_OVER_TEMP;
+
+ if (status & RT5759_UV_MASK)
+ events |= REGULATOR_ERROR_UNDER_VOLTAGE;
+
+ *flags = events;
+ return 0;
+}
+
+static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
+ bool enable)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int ocp_lvl[] = { 9800000, 10800000, 11800000 };
+ unsigned int ocp_regval;
+ int i;
+
+ /* Only support over current protection parameter */
+ if (severity != REGULATOR_SEVERITY_PROT)
+ return 0;
+
+ if (enable) {
+ /* Default ocp level is 10.8A */
+ if (lim_uA == 0)
+ lim_uA = 10800000;
+
+ for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) {
+ if (lim_uA <= ocp_lvl[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(ocp_lvl))
+ i = ARRAY_SIZE(ocp_lvl) - 1;
+
+ ocp_regval = i + 1;
+ } else
+ ocp_regval = 0;
+
+ return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK,
+ ocp_regval << RT5759_OCLVL_SHIFT);
+}
+
+static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity,
+ bool enable)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int otp_lvl[] = { 140, 150, 170 };
+ unsigned int otp_regval;
+ int i;
+
+ /* Only support over temperature protection parameter */
+ if (severity != REGULATOR_SEVERITY_PROT)
+ return 0;
+
+ if (enable) {
+ /* Default otp level is 150'c */
+ if (lim == 0)
+ lim = 150;
+
+ for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) {
+ if (lim <= otp_lvl[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(otp_lvl))
+ i = ARRAY_SIZE(otp_lvl) - 1;
+
+ otp_regval = i + 1;
+ } else
+ otp_regval = 0;
+
+ return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK,
+ otp_regval << RT5759_OTLVL_SHIFT);
+}
+
+static const struct regulator_ops rt5759_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_mode = rt5759_set_mode,
+ .get_mode = rt5759_get_mode,
+ .set_ramp_delay = regulator_set_ramp_delay_regmap,
+ .get_error_flags = rt5759_get_error_flags,
+ .set_over_current_protection = rt5759_set_ocp,
+ .set_thermal_protection = rt5759_set_otp,
+};
+
+static unsigned int rt5759_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case RT5759_FPWM_MODE:
+ return REGULATOR_MODE_FAST;
+ case RT5759_PSKIP_MODE:
+ return REGULATOR_MODE_NORMAL;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 };
+
+static int rt5759_regulator_register(struct rt5759_priv *priv)
+{
+ struct device_node *np = priv->dev->of_node;
+ struct regulator_desc *reg_desc = &priv->desc;
+ struct regulator_config reg_cfg;
+ struct regulator_dev *rdev;
+ int ret;
+
+ reg_desc->name = "rt5759-buck";
+ reg_desc->type = REGULATOR_VOLTAGE;
+ reg_desc->owner = THIS_MODULE;
+ reg_desc->ops = &rt5759_regulator_ops;
+ reg_desc->n_voltages = RT5759_NUM_VOLTS;
+ reg_desc->min_uV = RT5759_MIN_UV;
+ reg_desc->uV_step = RT5759_STEP_UV;
+ reg_desc->vsel_reg = RT5759_REG_VSEL;
+ reg_desc->vsel_mask = RT5759_VSEL_MASK;
+ reg_desc->enable_reg = RT5759_REG_DCDCCTRL;
+ reg_desc->enable_mask = RT5759_ENABLE_MASK;
+ reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL;
+ reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK;
+ reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK;
+ reg_desc->ramp_reg = RT5759_REG_FREQ;
+ reg_desc->ramp_mask = RT5759_TSTEP_MASK;
+ reg_desc->ramp_delay_table = rt5759_ramp_table;
+ reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table);
+ reg_desc->enable_time = RT5759_MINSS_TIMEUS;
+ reg_desc->of_map_mode = rt5759_of_map_mode;
+
+ /*
+ * RT5759 step uV = 10000
+ * RT5759A step uV = 12500
+ */
+ if (priv->chip_type == CHIP_TYPE_RT5759A)
+ reg_desc->uV_step = RT5759A_STEP_UV;
+
+ reg_cfg.dev = priv->dev;
+ reg_cfg.of_node = np;
+ reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
+ reg_cfg.regmap = priv->regmap;
+
+ rdev = devm_regulator_register(priv->dev, reg_desc, ®_cfg);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(priv->dev, "Failed to register regulator (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int rt5759_init_device_property(struct rt5759_priv *priv)
+{
+ unsigned int val = 0;
+
+ /*
+ * Only RT5759A support external watchdog input
+ */
+ if (priv->chip_type != CHIP_TYPE_RT5759A)
+ return 0;
+
+ if (device_property_read_bool(priv->dev, "richtek,watchdog-enable"))
+ val = RT5759A_WDTEN_MASK;
+
+ return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN,
+ RT5759A_WDTEN_MASK, val);
+}
+
+static int rt5759_manufacturer_check(struct rt5759_priv *priv)
+{
+ unsigned int vendor;
+ int ret;
+
+ ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor);
+ if (ret)
+ return ret;
+
+ if (vendor != RT5759_MANUFACTURER_ID) {
+ dev_err(priv->dev, "vendor info not correct (%d)\n", vendor);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg)
+{
+ struct rt5759_priv *priv = dev_get_drvdata(dev);
+
+ if (reg <= RT5759_REG_DCDCSET)
+ return true;
+
+ if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN)
+ return true;
+
+ return false;
+}
+
+static const struct regmap_config rt5759_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT5759A_REG_WDTEN,
+ .readable_reg = rt5759_is_accessible_reg,
+ .writeable_reg = rt5759_is_accessible_reg,
+};
+
+static int rt5759_probe(struct i2c_client *i2c)
+{
+ struct rt5759_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &i2c->dev;
+ priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
+ i2c_set_clientdata(i2c, priv);
+
+ priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret);
+ return ret;
+ }
+
+ ret = rt5759_manufacturer_check(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to check device (%d)\n", ret);
+ return ret;
+ }
+
+ ret = rt5759_init_device_property(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to init device (%d)\n", ret);
+ return ret;
+ }
+
+ return rt5759_regulator_register(priv);
+}
+
+static const struct of_device_id __maybe_unused rt5759_device_table[] = {
+ { .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 },
+ { .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt5759_device_table);
+
+static struct i2c_driver rt5759_driver = {
+ .driver = {
+ .name = "rt5759",
+ .of_match_table = of_match_ptr(rt5759_device_table),
+ },
+ .probe_new = rt5759_probe,
+};
+module_i2c_driver(rt5759_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver");
+MODULE_LICENSE("GPL v2");
projects / thirdparty / kernel / linux.git / commitdiff
