1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // Copyright (c) 2025 Richtek Technology Corp. 4 // 5 // Author: ChiYuan Huang <cy_huang@richtek.com> 6 7 #include <linux/bitfield.h> 8 #include <linux/bits.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/i2c.h> 11 #include <linux/module.h> 12 #include <linux/property.h> 13 #include <linux/regmap.h> 14 #include <linux/regulator/consumer.h> 15 #include <linux/regulator/driver.h> 16 #include <linux/regulator/of_regulator.h> 17 18 #define RT8092_REG_MNTRPT 0x00 19 #define RT8092_REG_VOUTH 0x10 20 #define RT8092_REG_VOUTL 0x11 21 #define RT8092_REG_PWMMODE 0x14 22 #define RT8092_REG_EVENT 0x18 23 #define RT8092_REG_VBANKH 0x1C 24 #define RT8092_REG_VBANKL 0x1D 25 #define RT8092_REG_VBOUND 0x1E 26 27 #define RT8092_TSDEVT_MASK BIT(7) 28 #define RT8092_PGEVT_MASK BIT(0) 29 #define RT8092_VSEL_MASK GENMASK(6, 0) 30 #define RT8092_VOUTEN_MASK BIT(7) 31 #define RT8092_FPWML_MASK BIT(7) 32 #define RT8092_FPWMH_MASK BIT(6) 33 #define RT8092_OCPEVT_MASK BIT(7) 34 #define RT8092_SCPEVT_MASK BIT(4) 35 #define RT8092_VINUVEVT_MASK BIT(1) 36 #define RT8092_VBANK_MASK GENMASK(1, 0) 37 38 #define RT8092_MODE_AUTO 0 39 #define RT8092_MODE_FPWM 1 40 #define RT8092_VOUT_BASEUV 303125 41 #define RT8092_VOUT_STEPUV 3125 42 #define RT8092_VOUT_MINSEL 15 43 #define RT8092_NUM_VOLTS 128 44 #define RT8092_INITSS_US 400 45 46 static int rt8092_get_vbank_index(struct regmap *regmap, bool vsel_high, unsigned int *vbank_idx) 47 { 48 unsigned int vbank_reg = vsel_high ? RT8092_REG_VBANKH : RT8092_REG_VBANKL; 49 unsigned int index; 50 int ret; 51 52 ret = regmap_read(regmap, vbank_reg, &index); 53 if (ret) 54 return ret; 55 56 *vbank_idx = FIELD_GET(RT8092_VBANK_MASK, index); 57 return 0; 58 } 59 60 static int rt8092_set_operating_mode(struct regulator_dev *rdev, unsigned int mode) 61 { 62 const struct regulator_desc *desc = rdev->desc; 63 struct regmap *regmap = rdev_get_regmap(rdev); 64 unsigned int mode_mask, mode_val; 65 66 mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK; 67 68 switch (mode) { 69 case REGULATOR_MODE_FAST: 70 mode_val = mode_mask; 71 break; 72 case REGULATOR_MODE_NORMAL: 73 mode_val = 0; 74 break; 75 default: 76 return -EINVAL; 77 } 78 79 return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val); 80 } 81 82 static unsigned int rt8092_get_operating_mode(struct regulator_dev *rdev) 83 { 84 const struct regulator_desc *desc = rdev->desc; 85 struct regmap *regmap = rdev_get_regmap(rdev); 86 unsigned int mode_mask, mode_val; 87 int ret; 88 89 mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK; 90 91 ret = regmap_read(regmap, RT8092_REG_PWMMODE, &mode_val); 92 if (ret) 93 return REGULATOR_MODE_INVALID; 94 95 return mode_val & mode_mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; 96 } 97 98 static int rt8092_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) 99 { 100 struct regmap *regmap = rdev_get_regmap(rdev); 101 unsigned int mntrpt, evtrpt, events = 0; 102 int ret; 103 104 ret = regmap_read(regmap, RT8092_REG_MNTRPT, &mntrpt); 105 if (ret) 106 return ret; 107 108 ret = regmap_read(regmap, RT8092_REG_EVENT, &evtrpt); 109 if (ret) 110 return ret; 111 112 if (!(mntrpt & RT8092_PGEVT_MASK) || evtrpt & RT8092_VINUVEVT_MASK) 113 events |= REGULATOR_ERROR_UNDER_VOLTAGE; 114 115 if (mntrpt & RT8092_TSDEVT_MASK) 116 events |= REGULATOR_ERROR_OVER_TEMP; 117 118 if (evtrpt & RT8092_OCPEVT_MASK) 119 events |= REGULATOR_ERROR_OVER_CURRENT; 120 121 if (evtrpt & RT8092_SCPEVT_MASK) 122 events |= REGULATOR_ERROR_FAIL; 123 124 *flags = events; 125 return 0; 126 } 127 128 129 static int rt8092_set_suspend_voltage(struct regulator_dev *rdev, int uV) 130 { 131 const struct regulator_desc *desc = rdev->desc; 132 struct regmap *regmap = rdev_get_regmap(rdev); 133 unsigned int vsel_reg, vsel_val, vbank_idx; 134 bool vsel_high; 135 int ret; 136 137 vsel_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH; 138 vsel_high = desc->vsel_reg == RT8092_REG_VOUTH; 139 140 ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx); 141 if (ret) 142 return ret; 143 144 /* VOUT = (BASEUV + STEPUV * VSEL) * 2^vbank_idx */ 145 uV >>= vbank_idx; 146 if (uV < RT8092_VOUT_BASEUV) 147 return -EINVAL; 148 149 vsel_val = (uV - RT8092_VOUT_BASEUV) / RT8092_VOUT_STEPUV; 150 if (vsel_val < RT8092_VOUT_MINSEL || vsel_val >= RT8092_NUM_VOLTS) 151 return -EINVAL; 152 153 return regmap_update_bits(regmap, vsel_reg, RT8092_VSEL_MASK, vsel_val); 154 } 155 156 static int rt8092_set_suspend_enable(struct regulator_dev *rdev) 157 { 158 const struct regulator_desc *desc = rdev->desc; 159 struct regmap *regmap = rdev_get_regmap(rdev); 160 unsigned int enable_reg; 161 162 enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH; 163 return regmap_set_bits(regmap, enable_reg, RT8092_VOUTEN_MASK); 164 } 165 166 static int rt8092_set_suspend_disable(struct regulator_dev *rdev) 167 { 168 const struct regulator_desc *desc = rdev->desc; 169 struct regmap *regmap = rdev_get_regmap(rdev); 170 unsigned int enable_reg; 171 172 enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH; 173 return regmap_clear_bits(regmap, enable_reg, RT8092_VOUTEN_MASK); 174 } 175 176 static int rt8092_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode) 177 { 178 const struct regulator_desc *desc = rdev->desc; 179 struct regmap *regmap = rdev_get_regmap(rdev); 180 unsigned int mode_mask, mode_val; 181 182 mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWML_MASK : RT8092_FPWMH_MASK; 183 184 switch (mode) { 185 case REGULATOR_MODE_FAST: 186 mode_val = mode_mask; 187 break; 188 case REGULATOR_MODE_NORMAL: 189 mode_val = 0; 190 break; 191 default: 192 return -EINVAL; 193 } 194 195 return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val); 196 } 197 198 static const struct regulator_ops rt8092_regulator_ops = { 199 .list_voltage = regulator_list_voltage_linear, 200 .get_voltage_sel = regulator_get_voltage_sel_regmap, 201 .set_voltage_sel = regulator_set_voltage_sel_regmap, 202 .enable = regulator_enable_regmap, 203 .disable = regulator_disable_regmap, 204 .is_enabled = regulator_is_enabled_regmap, 205 .set_mode = rt8092_set_operating_mode, 206 .get_mode = rt8092_get_operating_mode, 207 .get_error_flags = rt8092_get_error_flags, 208 .set_suspend_voltage = rt8092_set_suspend_voltage, 209 .set_suspend_enable = rt8092_set_suspend_enable, 210 .set_suspend_disable = rt8092_set_suspend_disable, 211 .set_suspend_mode = rt8092_set_suspend_mode, 212 }; 213 214 static unsigned int rt8092_of_map_mode(unsigned int mode) 215 { 216 switch (mode) { 217 case RT8092_MODE_AUTO: 218 return REGULATOR_MODE_NORMAL; 219 case RT8092_MODE_FPWM: 220 return REGULATOR_MODE_FAST; 221 default: 222 return REGULATOR_MODE_INVALID; 223 } 224 } 225 226 static const struct regmap_config rt8092_regmap_cfg = { 227 .name = "rt8092", 228 .reg_bits = 8, 229 .val_bits = 8, 230 .max_register = RT8092_REG_VBOUND, 231 }; 232 233 static int rt8092_probe(struct i2c_client *i2c) 234 { 235 unsigned int vbank_idx, min_uV, step_uV; 236 struct regulator_config cfg = {}; 237 struct device *dev = &i2c->dev; 238 struct regulator_desc *desc; 239 struct regulator_dev *rdev; 240 struct gpio_desc *enable; 241 struct regmap *regmap; 242 bool vsel_high; 243 int ret; 244 245 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); 246 if (!desc) 247 return -ENOMEM; 248 249 enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); 250 if (IS_ERR(enable)) 251 return dev_err_probe(dev, PTR_ERR(enable), "Failed get 'enable' gpio\n"); 252 253 regmap = devm_regmap_init_i2c(i2c, &rt8092_regmap_cfg); 254 if (IS_ERR(regmap)) 255 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n"); 256 257 vsel_high = device_property_read_bool(dev, "richtek,vsel-active-high"); 258 259 ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx); 260 if (ret) 261 return dev_err_probe(dev, ret, "Failed to get VOUT bank index\n"); 262 263 /* 264 * step VOUT = STEP_UV * 2^vbank_idx 265 * min VOUT = (BASEUV + STEPUV * VMIN_SEL) * 2^vbank_idx 266 */ 267 step_uV = RT8092_VOUT_STEPUV << vbank_idx; 268 min_uV = (RT8092_VOUT_BASEUV + RT8092_VOUT_STEPUV * RT8092_VOUT_MINSEL) << vbank_idx; 269 270 desc->name = "rt8092"; 271 desc->owner = THIS_MODULE; 272 desc->type = REGULATOR_VOLTAGE; 273 desc->ops = &rt8092_regulator_ops; 274 desc->n_voltages = RT8092_NUM_VOLTS; 275 desc->min_uV = min_uV; 276 desc->uV_step = step_uV; 277 desc->linear_min_sel = RT8092_VOUT_MINSEL; 278 desc->enable_reg = desc->vsel_reg = vsel_high ? RT8092_REG_VOUTH : RT8092_REG_VOUTL; 279 desc->vsel_mask = RT8092_VSEL_MASK; 280 desc->enable_mask = RT8092_VOUTEN_MASK; 281 desc->enable_time = RT8092_INITSS_US; 282 desc->of_map_mode = rt8092_of_map_mode; 283 284 cfg.dev = dev; 285 cfg.of_node = dev_of_node(dev); 286 cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc); 287 288 rdev = devm_regulator_register(dev, desc, &cfg); 289 if (IS_ERR(rdev)) 290 return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n"); 291 292 return 0; 293 } 294 295 static const struct of_device_id rt8092_device_tables[] = { 296 { .compatible = "richtek,rt8092" }, 297 {} 298 }; 299 MODULE_DEVICE_TABLE(of, rt8092_device_tables); 300 301 static struct i2c_driver rt8092_driver = { 302 .driver = { 303 .name = "rt8092", 304 .of_match_table = rt8092_device_tables, 305 }, 306 .probe = rt8092_probe, 307 }; 308 module_i2c_driver(rt8092_driver); 309 310 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); 311 MODULE_DESCRIPTION("Richtek RT8092 Regulator Driver"); 312 MODULE_LICENSE("GPL"); 313