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 && priv->enable_gpio) { 58 gpiod_set_value(priv->enable_gpio, 1); 59 60 usleep_range(RTQ6752_I2CRDY_TIMEUS, 61 RTQ6752_I2CRDY_TIMEUS + 100); 62 63 regcache_cache_only(priv->regmap, false); 64 ret = regcache_sync(priv->regmap); 65 if (ret) { 66 mutex_unlock(&priv->lock); 67 return ret; 68 } 69 } 70 71 priv->enable_flag |= BIT(rid); 72 mutex_unlock(&priv->lock); 73 74 return regulator_enable_regmap(rdev); 75 } 76 77 static int rtq6752_set_vdd_disable(struct regulator_dev *rdev) 78 { 79 struct rtq6752_priv *priv = rdev_get_drvdata(rdev); 80 int rid = rdev_get_id(rdev), ret; 81 82 ret = regulator_disable_regmap(rdev); 83 if (ret) 84 return ret; 85 86 mutex_lock(&priv->lock); 87 priv->enable_flag &= ~BIT(rid); 88 89 if (!priv->enable_flag && priv->enable_gpio) { 90 regcache_cache_only(priv->regmap, true); 91 regcache_mark_dirty(priv->regmap); 92 93 gpiod_set_value(priv->enable_gpio, 0); 94 } 95 mutex_unlock(&priv->lock); 96 97 return 0; 98 } 99 100 static int rtq6752_get_error_flags(struct regulator_dev *rdev, 101 unsigned int *flags) 102 { 103 unsigned int val, events = 0; 104 const unsigned int fault_mask[] = { 105 RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK }; 106 int rid = rdev_get_id(rdev), ret; 107 108 ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val); 109 if (ret) 110 return ret; 111 112 if (val & fault_mask[rid]) 113 events = REGULATOR_ERROR_REGULATION_OUT; 114 115 *flags = events; 116 return 0; 117 } 118 119 static const struct regulator_ops rtq6752_regulator_ops = { 120 .list_voltage = regulator_list_voltage_linear, 121 .set_voltage_sel = regulator_set_voltage_sel_regmap, 122 .get_voltage_sel = regulator_get_voltage_sel_regmap, 123 .enable = rtq6752_set_vdd_enable, 124 .disable = rtq6752_set_vdd_disable, 125 .is_enabled = regulator_is_enabled_regmap, 126 .set_active_discharge = regulator_set_active_discharge_regmap, 127 .get_error_flags = rtq6752_get_error_flags, 128 }; 129 130 static const struct regulator_desc rtq6752_regulator_descs[] = { 131 { 132 .name = "rtq6752-pavdd", 133 .of_match = of_match_ptr("pavdd"), 134 .regulators_node = of_match_ptr("regulators"), 135 .id = RTQ6752_IDX_PAVDD, 136 .n_voltages = RTQ6752_VOUT_NUM, 137 .ops = &rtq6752_regulator_ops, 138 .owner = THIS_MODULE, 139 .min_uV = RTQ6752_VOUT_MINUV, 140 .uV_step = RTQ6752_VOUT_STEPUV, 141 .enable_time = RTQ6752_MINSS_TIMEUS, 142 .vsel_reg = RTQ6752_REG_PAVDD, 143 .vsel_mask = RTQ6752_VOUT_MASK, 144 .enable_reg = RTQ6752_REG_CHSWITCH, 145 .enable_mask = RTQ6752_PAVDDEN_MASK, 146 .active_discharge_reg = RTQ6752_REG_OPTION1, 147 .active_discharge_mask = RTQ6752_PAVDDAD_MASK, 148 .active_discharge_off = RTQ6752_PAVDDAD_MASK, 149 }, 150 { 151 .name = "rtq6752-navdd", 152 .of_match = of_match_ptr("navdd"), 153 .regulators_node = of_match_ptr("regulators"), 154 .id = RTQ6752_IDX_NAVDD, 155 .n_voltages = RTQ6752_VOUT_NUM, 156 .ops = &rtq6752_regulator_ops, 157 .owner = THIS_MODULE, 158 .min_uV = RTQ6752_VOUT_MINUV, 159 .uV_step = RTQ6752_VOUT_STEPUV, 160 .enable_time = RTQ6752_MINSS_TIMEUS, 161 .vsel_reg = RTQ6752_REG_NAVDD, 162 .vsel_mask = RTQ6752_VOUT_MASK, 163 .enable_reg = RTQ6752_REG_CHSWITCH, 164 .enable_mask = RTQ6752_NAVDDEN_MASK, 165 .active_discharge_reg = RTQ6752_REG_OPTION1, 166 .active_discharge_mask = RTQ6752_NAVDDAD_MASK, 167 .active_discharge_off = RTQ6752_NAVDDAD_MASK, 168 } 169 }; 170 171 static int rtq6752_init_device_properties(struct rtq6752_priv *priv) 172 { 173 u8 raw_vals[] = { 0, 0 }; 174 int ret; 175 176 /* Configure PAVDD on and softstart delay time to the minimum */ 177 ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals, 178 ARRAY_SIZE(raw_vals)); 179 if (ret) 180 return ret; 181 182 /* Configure NAVDD on and softstart delay time to the minimum */ 183 return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals, 184 ARRAY_SIZE(raw_vals)); 185 } 186 187 static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg) 188 { 189 if (reg == RTQ6752_REG_FAULT) 190 return true; 191 return false; 192 } 193 194 static const struct reg_default rtq6752_reg_defaults[] = { 195 { RTQ6752_REG_PAVDD, 0x14 }, 196 { RTQ6752_REG_NAVDD, 0x14 }, 197 { RTQ6752_REG_PAVDDONDLY, 0x01 }, 198 { RTQ6752_REG_PAVDDSSTIME, 0x01 }, 199 { RTQ6752_REG_NAVDDONDLY, 0x01 }, 200 { RTQ6752_REG_NAVDDSSTIME, 0x01 }, 201 { RTQ6752_REG_OPTION1, 0x07 }, 202 { RTQ6752_REG_CHSWITCH, 0x29 }, 203 }; 204 205 static const struct regmap_config rtq6752_regmap_config = { 206 .reg_bits = 8, 207 .val_bits = 8, 208 .cache_type = REGCACHE_RBTREE, 209 .max_register = RTQ6752_REG_FAULT, 210 .reg_defaults = rtq6752_reg_defaults, 211 .num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults), 212 .volatile_reg = rtq6752_is_volatile_reg, 213 }; 214 215 static int rtq6752_probe(struct i2c_client *i2c) 216 { 217 struct rtq6752_priv *priv; 218 struct regulator_config reg_cfg = {}; 219 struct regulator_dev *rdev; 220 int i, ret; 221 222 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 223 if (!priv) 224 return -ENOMEM; 225 226 mutex_init(&priv->lock); 227 228 priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", 229 GPIOD_OUT_HIGH); 230 if (IS_ERR(priv->enable_gpio)) { 231 dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); 232 return PTR_ERR(priv->enable_gpio); 233 } 234 235 usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100); 236 /* Default EN pin to high, PAVDD and NAVDD will be on */ 237 priv->enable_flag = RTQ6752_ENABLE_MASK; 238 239 priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config); 240 if (IS_ERR(priv->regmap)) { 241 dev_err(&i2c->dev, "Failed to init regmap\n"); 242 return PTR_ERR(priv->regmap); 243 } 244 245 ret = rtq6752_init_device_properties(priv); 246 if (ret) { 247 dev_err(&i2c->dev, "Failed to init device properties\n"); 248 return ret; 249 } 250 251 reg_cfg.dev = &i2c->dev; 252 reg_cfg.regmap = priv->regmap; 253 reg_cfg.driver_data = priv; 254 255 for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) { 256 rdev = devm_regulator_register(&i2c->dev, 257 rtq6752_regulator_descs + i, 258 ®_cfg); 259 if (IS_ERR(rdev)) { 260 dev_err(&i2c->dev, "Failed to init %d regulator\n", i); 261 return PTR_ERR(rdev); 262 } 263 } 264 265 return 0; 266 } 267 268 static const struct of_device_id __maybe_unused rtq6752_device_table[] = { 269 { .compatible = "richtek,rtq6752", }, 270 {} 271 }; 272 MODULE_DEVICE_TABLE(of, rtq6752_device_table); 273 274 static struct i2c_driver rtq6752_driver = { 275 .driver = { 276 .name = "rtq6752", 277 .of_match_table = rtq6752_device_table, 278 }, 279 .probe_new = rtq6752_probe, 280 }; 281 module_i2c_driver(rtq6752_driver); 282 283 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>"); 284 MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver"); 285 MODULE_LICENSE("GPL v2"); 286