1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2023 Richtek Technology Corp. 4 * 5 * Author: ChiYuan Huang <cy_huang@richtek.com> 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/property.h> 12 #include <linux/regmap.h> 13 #include <linux/regulator/driver.h> 14 #include <linux/regulator/of_regulator.h> 15 16 #define RT4803_AUTO_MODE 1 17 #define RT4803_FPWM_MODE 2 18 19 #define RT4803_REG_CONFIG 0x01 20 #define RT4803_REG_VSELL 0x02 21 #define RT4803_REG_VSELH 0x03 22 #define RT4803_REG_ILIM 0x04 23 #define RT4803_REG_STAT 0x05 24 25 #define RT4803_MODE_MASK GENMASK(1, 0) 26 #define RT4803_VSEL_MASK GENMASK(4, 0) 27 #define RT4803_ILIM_MASK GENMASK(3, 0) 28 #define RT4803_TSD_MASK BIT(7) 29 #define RT4803_HOTDIE_MASK BIT(6) 30 #define RT4803_FAULT_MASK BIT(1) 31 #define RT4803_PGOOD_MASK BIT(0) 32 33 #define RT4803_VOUT_MINUV 2850000 34 #define RT4803_VOUT_STEPUV 50000 35 #define RT4803_VOUT_NUM 32 36 37 static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode) 38 { 39 struct regmap *regmap = rdev_get_regmap(rdev); 40 unsigned int modeval; 41 42 switch (mode) { 43 case REGULATOR_MODE_NORMAL: 44 modeval = RT4803_AUTO_MODE; 45 break; 46 case REGULATOR_MODE_FAST: 47 modeval = RT4803_FPWM_MODE; 48 break; 49 default: 50 return -EINVAL; 51 } 52 53 modeval <<= ffs(RT4803_MODE_MASK) - 1; 54 55 return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval); 56 } 57 58 static unsigned int rt4803_get_mode(struct regulator_dev *rdev) 59 { 60 struct regmap *regmap = rdev_get_regmap(rdev); 61 unsigned int modeval; 62 int ret; 63 64 ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval); 65 if (ret) 66 return REGULATOR_MODE_INVALID; 67 68 modeval >>= ffs(RT4803_MODE_MASK) - 1; 69 70 switch (modeval) { 71 case RT4803_AUTO_MODE: 72 return REGULATOR_MODE_NORMAL; 73 case RT4803_FPWM_MODE: 74 return REGULATOR_MODE_FAST; 75 default: 76 return REGULATOR_MODE_INVALID; 77 } 78 } 79 80 static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) 81 { 82 struct regmap *regmap = rdev_get_regmap(rdev); 83 unsigned int state, events = 0; 84 int ret; 85 86 ret = regmap_read(regmap, RT4803_REG_STAT, &state); 87 if (ret) 88 return ret; 89 90 if (state & RT4803_PGOOD_MASK) 91 goto out_error_flag; 92 93 if (state & RT4803_FAULT_MASK) 94 events |= REGULATOR_ERROR_FAIL; 95 96 if (state & RT4803_HOTDIE_MASK) 97 events |= REGULATOR_ERROR_OVER_TEMP_WARN; 98 99 if (state & RT4803_TSD_MASK) 100 events |= REGULATOR_ERROR_OVER_TEMP; 101 102 out_error_flag: 103 *flags = events; 104 return 0; 105 } 106 107 static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV) 108 { 109 struct regmap *regmap = rdev_get_regmap(rdev); 110 unsigned int reg, vsel; 111 112 if (rdev->desc->vsel_reg == RT4803_REG_VSELL) 113 reg = RT4803_REG_VSELH; 114 else 115 reg = RT4803_REG_VSELL; 116 117 vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step; 118 vsel <<= ffs(RT4803_VSEL_MASK) - 1; 119 120 return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel); 121 } 122 123 static const struct regulator_ops rt4803_regulator_ops = { 124 .list_voltage = regulator_list_voltage_linear, 125 .set_voltage_sel = regulator_set_voltage_sel_regmap, 126 .get_voltage_sel = regulator_get_voltage_sel_regmap, 127 .set_mode = rt4803_set_mode, 128 .get_mode = rt4803_get_mode, 129 .get_error_flags = rt4803_get_error_flags, 130 .set_suspend_voltage = rt4803_set_suspend_voltage, 131 }; 132 133 static unsigned int rt4803_of_map_mode(unsigned int mode) 134 { 135 switch (mode) { 136 case RT4803_AUTO_MODE: 137 return REGULATOR_MODE_NORMAL; 138 case RT4803_FPWM_MODE: 139 return REGULATOR_MODE_FAST; 140 default: 141 return REGULATOR_MODE_INVALID; 142 } 143 } 144 145 static const struct regmap_config rt4803_regmap_config = { 146 .reg_bits = 8, 147 .val_bits = 8, 148 .max_register = RT4803_REG_STAT, 149 }; 150 151 static int rt4803_probe(struct i2c_client *i2c) 152 { 153 struct device *dev = &i2c->dev; 154 struct regmap *regmap; 155 struct regulator_desc *desc; 156 struct regulator_config cfg = {}; 157 struct regulator_dev *rdev; 158 bool vsel_act_high; 159 int ret; 160 161 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); 162 if (!desc) 163 return -ENOMEM; 164 165 regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config); 166 if (IS_ERR(regmap)) 167 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n"); 168 169 /* Always configure the input current limit to max 5A at initial */ 170 ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff); 171 if (ret) 172 return dev_err_probe(dev, ret, "Failed to config ILIM to max\n"); 173 174 vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high"); 175 176 desc->name = "rt4803-regulator"; 177 desc->type = REGULATOR_VOLTAGE; 178 desc->owner = THIS_MODULE; 179 desc->ops = &rt4803_regulator_ops; 180 desc->min_uV = RT4803_VOUT_MINUV; 181 desc->uV_step = RT4803_VOUT_STEPUV; 182 desc->n_voltages = RT4803_VOUT_NUM; 183 desc->vsel_mask = RT4803_VSEL_MASK; 184 desc->of_map_mode = rt4803_of_map_mode; 185 if (vsel_act_high) 186 desc->vsel_reg = RT4803_REG_VSELH; 187 else 188 desc->vsel_reg = RT4803_REG_VSELL; 189 190 cfg.dev = dev; 191 cfg.of_node = dev_of_node(dev); 192 cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc); 193 194 rdev = devm_regulator_register(dev, desc, &cfg); 195 return PTR_ERR_OR_ZERO(rdev); 196 } 197 198 static const struct of_device_id rt4803_device_match_table[] = { 199 { .compatible = "richtek,rt4803" }, 200 {} 201 }; 202 MODULE_DEVICE_TABLE(of, rt4803_device_match_table); 203 204 static struct i2c_driver rt4803_driver = { 205 .driver = { 206 .name = "rt4803", 207 .of_match_table = rt4803_device_match_table, 208 }, 209 .probe = rt4803_probe, 210 }; 211 module_i2c_driver(rt4803_driver); 212 213 MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver"); 214 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); 215 MODULE_LICENSE("GPL"); 216