1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <linux/bitops.h> 4 #include <linux/delay.h> 5 #include <linux/gpio/consumer.h> 6 #include <linux/i2c.h> 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 #include <linux/mutex.h> 10 #include <linux/regmap.h> 11 #include <linux/regulator/driver.h> 12 13 enum { 14 RTQ6752_IDX_PAVDD = 0, 15 RTQ6752_IDX_NAVDD = 1, 16 RTQ6752_IDX_MAX 17 }; 18 19 #define RTQ6752_REG_PAVDD 0x00 20 #define RTQ6752_REG_NAVDD 0x01 21 #define RTQ6752_REG_PAVDDONDLY 0x07 22 #define RTQ6752_REG_PAVDDSSTIME 0x08 23 #define RTQ6752_REG_NAVDDONDLY 0x0D 24 #define RTQ6752_REG_NAVDDSSTIME 0x0E 25 #define RTQ6752_REG_OPTION1 0x12 26 #define RTQ6752_REG_CHSWITCH 0x16 27 #define RTQ6752_REG_FAULT 0x1D 28 29 #define RTQ6752_VOUT_MASK GENMASK(5, 0) 30 #define RTQ6752_NAVDDEN_MASK BIT(3) 31 #define RTQ6752_PAVDDEN_MASK BIT(0) 32 #define RTQ6752_PAVDDAD_MASK BIT(4) 33 #define RTQ6752_NAVDDAD_MASK BIT(3) 34 #define RTQ6752_PAVDDF_MASK BIT(3) 35 #define RTQ6752_NAVDDF_MASK BIT(0) 36 #define RTQ6752_ENABLE_MASK (BIT(RTQ6752_IDX_MAX) - 1) 37 38 #define RTQ6752_VOUT_MINUV 5000000 39 #define RTQ6752_VOUT_STEPUV 50000 40 #define RTQ6752_VOUT_NUM 47 41 #define RTQ6752_I2CRDY_TIMEUS 1000 42 #define RTQ6752_MINSS_TIMEUS 5000 43 44 struct rtq6752_priv { 45 struct regmap *regmap; 46 struct gpio_desc *enable_gpio; 47 struct mutex lock; 48 unsigned char enable_flag; 49 }; 50 51 static int rtq6752_set_vdd_enable(struct regulator_dev *rdev) 52 { 53 struct rtq6752_priv *priv = rdev_get_drvdata(rdev); 54 int rid = rdev_get_id(rdev), ret; 55 56 mutex_lock(&priv->lock); 57 if (!priv->enable_flag) { 58 if (priv->enable_gpio) { 59 gpiod_set_value(priv->enable_gpio, 1); 60 61 usleep_range(RTQ6752_I2CRDY_TIMEUS, 62 RTQ6752_I2CRDY_TIMEUS + 100); 63 } 64 65 regcache_cache_only(priv->regmap, false); 66 ret = regcache_sync(priv->regmap); 67 if (ret) { 68 mutex_unlock(&priv->lock); 69 return ret; 70 } 71 } 72 73 priv->enable_flag |= BIT(rid); 74 mutex_unlock(&priv->lock); 75 76 return regulator_enable_regmap(rdev); 77 } 78 79 static int rtq6752_set_vdd_disable(struct regulator_dev *rdev) 80 { 81 struct rtq6752_priv *priv = rdev_get_drvdata(rdev); 82 int rid = rdev_get_id(rdev), ret; 83 84 ret = regulator_disable_regmap(rdev); 85 if (ret) 86 return ret; 87 88 mutex_lock(&priv->lock); 89 priv->enable_flag &= ~BIT(rid); 90 91 if (!priv->enable_flag) { 92 regcache_cache_only(priv->regmap, true); 93 regcache_mark_dirty(priv->regmap); 94 95 if (priv->enable_gpio) 96 gpiod_set_value(priv->enable_gpio, 0); 97 98 } 99 mutex_unlock(&priv->lock); 100 101 return 0; 102 } 103 104 static int rtq6752_get_error_flags(struct regulator_dev *rdev, 105 unsigned int *flags) 106 { 107 unsigned int val, events = 0; 108 const unsigned int fault_mask[] = { 109 RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK }; 110 int rid = rdev_get_id(rdev), ret; 111 112 ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val); 113 if (ret) 114 return ret; 115 116 if (val & fault_mask[rid]) 117 events = REGULATOR_ERROR_REGULATION_OUT; 118 119 *flags = events; 120 return 0; 121 } 122 123 static const struct regulator_ops rtq6752_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 .enable = rtq6752_set_vdd_enable, 128 .disable = rtq6752_set_vdd_disable, 129 .is_enabled = regulator_is_enabled_regmap, 130 .set_active_discharge = regulator_set_active_discharge_regmap, 131 .get_error_flags = rtq6752_get_error_flags, 132 }; 133 134 static const struct regulator_desc rtq6752_regulator_descs[] = { 135 { 136 .name = "rtq6752-pavdd", 137 .of_match = of_match_ptr("pavdd"), 138 .regulators_node = of_match_ptr("regulators"), 139 .id = RTQ6752_IDX_PAVDD, 140 .n_voltages = RTQ6752_VOUT_NUM, 141 .ops = &rtq6752_regulator_ops, 142 .owner = THIS_MODULE, 143 .min_uV = RTQ6752_VOUT_MINUV, 144 .uV_step = RTQ6752_VOUT_STEPUV, 145 .enable_time = RTQ6752_MINSS_TIMEUS, 146 .vsel_reg = RTQ6752_REG_PAVDD, 147 .vsel_mask = RTQ6752_VOUT_MASK, 148 .enable_reg = RTQ6752_REG_CHSWITCH, 149 .enable_mask = RTQ6752_PAVDDEN_MASK, 150 .active_discharge_reg = RTQ6752_REG_OPTION1, 151 .active_discharge_mask = RTQ6752_PAVDDAD_MASK, 152 .active_discharge_off = RTQ6752_PAVDDAD_MASK, 153 }, 154 { 155 .name = "rtq6752-navdd", 156 .of_match = of_match_ptr("navdd"), 157 .regulators_node = of_match_ptr("regulators"), 158 .id = RTQ6752_IDX_NAVDD, 159 .n_voltages = RTQ6752_VOUT_NUM, 160 .ops = &rtq6752_regulator_ops, 161 .owner = THIS_MODULE, 162 .min_uV = RTQ6752_VOUT_MINUV, 163 .uV_step = RTQ6752_VOUT_STEPUV, 164 .enable_time = RTQ6752_MINSS_TIMEUS, 165 .vsel_reg = RTQ6752_REG_NAVDD, 166 .vsel_mask = RTQ6752_VOUT_MASK, 167 .enable_reg = RTQ6752_REG_CHSWITCH, 168 .enable_mask = RTQ6752_NAVDDEN_MASK, 169 .active_discharge_reg = RTQ6752_REG_OPTION1, 170 .active_discharge_mask = RTQ6752_NAVDDAD_MASK, 171 .active_discharge_off = RTQ6752_NAVDDAD_MASK, 172 } 173 }; 174 175 static int rtq6752_init_device_properties(struct rtq6752_priv *priv) 176 { 177 u8 raw_vals[] = { 0, 0 }; 178 int ret; 179 180 /* Configure PAVDD on and softstart delay time to the minimum */ 181 ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals, 182 ARRAY_SIZE(raw_vals)); 183 if (ret) 184 return ret; 185 186 /* Configure NAVDD on and softstart delay time to the minimum */ 187 return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals, 188 ARRAY_SIZE(raw_vals)); 189 } 190 191 static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg) 192 { 193 if (reg == RTQ6752_REG_FAULT) 194 return true; 195 return false; 196 } 197 198 static const struct reg_default rtq6752_reg_defaults[] = { 199 { RTQ6752_REG_PAVDD, 0x14 }, 200 { RTQ6752_REG_NAVDD, 0x14 }, 201 { RTQ6752_REG_PAVDDONDLY, 0x01 }, 202 { RTQ6752_REG_PAVDDSSTIME, 0x01 }, 203 { RTQ6752_REG_NAVDDONDLY, 0x01 }, 204 { RTQ6752_REG_NAVDDSSTIME, 0x01 }, 205 { RTQ6752_REG_OPTION1, 0x07 }, 206 { RTQ6752_REG_CHSWITCH, 0x29 }, 207 }; 208 209 static const struct regmap_config rtq6752_regmap_config = { 210 .reg_bits = 8, 211 .val_bits = 8, 212 .cache_type = REGCACHE_RBTREE, 213 .max_register = RTQ6752_REG_FAULT, 214 .reg_defaults = rtq6752_reg_defaults, 215 .num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults), 216 .volatile_reg = rtq6752_is_volatile_reg, 217 }; 218 219 static int rtq6752_probe(struct i2c_client *i2c) 220 { 221 struct rtq6752_priv *priv; 222 struct regulator_config reg_cfg = {}; 223 struct regulator_dev *rdev; 224 int i, ret; 225 226 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 227 if (!priv) 228 return -ENOMEM; 229 230 mutex_init(&priv->lock); 231 232 priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", 233 GPIOD_OUT_HIGH); 234 if (IS_ERR(priv->enable_gpio)) { 235 dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); 236 return PTR_ERR(priv->enable_gpio); 237 } 238 239 usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100); 240 /* Default EN pin to high, PAVDD and NAVDD will be on */ 241 priv->enable_flag = RTQ6752_ENABLE_MASK; 242 243 priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config); 244 if (IS_ERR(priv->regmap)) { 245 dev_err(&i2c->dev, "Failed to init regmap\n"); 246 return PTR_ERR(priv->regmap); 247 } 248 249 ret = rtq6752_init_device_properties(priv); 250 if (ret) { 251 dev_err(&i2c->dev, "Failed to init device properties\n"); 252 return ret; 253 } 254 255 reg_cfg.dev = &i2c->dev; 256 reg_cfg.regmap = priv->regmap; 257 reg_cfg.driver_data = priv; 258 259 for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) { 260 rdev = devm_regulator_register(&i2c->dev, 261 rtq6752_regulator_descs + i, 262 ®_cfg); 263 if (IS_ERR(rdev)) { 264 dev_err(&i2c->dev, "Failed to init %d regulator\n", i); 265 return PTR_ERR(rdev); 266 } 267 } 268 269 return 0; 270 } 271 272 static const struct of_device_id __maybe_unused rtq6752_device_table[] = { 273 { .compatible = "richtek,rtq6752", }, 274 {} 275 }; 276 MODULE_DEVICE_TABLE(of, rtq6752_device_table); 277 278 static struct i2c_driver rtq6752_driver = { 279 .driver = { 280 .name = "rtq6752", 281 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 282 .of_match_table = rtq6752_device_table, 283 }, 284 .probe = rtq6752_probe, 285 }; 286 module_i2c_driver(rtq6752_driver); 287 288 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); 289 MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver"); 290 MODULE_LICENSE("GPL v2"); 291