| // 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; |
| |
| memset(®_cfg, 0, sizeof(reg_cfg)); |
| 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", |
| .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| .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"); |