1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // AWINIC AW37503 Regulator Driver 4 // 5 // Copyright (C) 2023 awinic. All Rights Reserved 6 // 7 // Author: <like@awinic.com> 8 9 #include <linux/err.h> 10 #include <linux/gpio/consumer.h> 11 #include <linux/i2c.h> 12 #include <linux/module.h> 13 #include <linux/regmap.h> 14 #include <linux/regulator/driver.h> 15 #include <linux/regulator/machine.h> 16 17 #define AW37503_REG_VPOS 0x00 18 #define AW37503_REG_VNEG 0x01 19 #define AW37503_REG_APPS 0x03 20 #define AW37503_REG_CONTROL 0x04 21 #define AW37503_REG_WPRTEN 0x21 22 23 #define AW37503_VOUT_MASK 0x1F 24 #define AW37503_VOUT_N_VOLTAGE 0x15 25 #define AW37503_VOUT_VMIN 4000000 26 #define AW37503_VOUT_VMAX 6000000 27 #define AW37503_VOUT_STEP 100000 28 29 #define AW37503_REG_APPS_DIS_VPOS BIT(1) 30 #define AW37503_REG_APPS_DIS_VNEG BIT(0) 31 32 #define AW37503_REGULATOR_ID_VPOS 0 33 #define AW37503_REGULATOR_ID_VNEG 1 34 #define AW37503_MAX_REGULATORS 2 35 36 struct aw37503_reg_pdata { 37 struct gpio_desc *en_gpiod; 38 int ena_gpio_state; 39 }; 40 41 struct aw37503_regulator { 42 struct device *dev; 43 struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS]; 44 }; 45 46 static int aw37503_regulator_enable(struct regulator_dev *rdev) 47 { 48 struct aw37503_regulator *chip = rdev_get_drvdata(rdev); 49 int id = rdev_get_id(rdev); 50 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; 51 int ret; 52 53 if (!IS_ERR(rpdata->en_gpiod)) { 54 gpiod_set_value_cansleep(rpdata->en_gpiod, 1); 55 rpdata->ena_gpio_state = 1; 56 } 57 58 /* Hardware automatically enable discharge bit in enable */ 59 if (rdev->constraints->active_discharge == 60 REGULATOR_ACTIVE_DISCHARGE_DISABLE) { 61 ret = regulator_set_active_discharge_regmap(rdev, false); 62 if (ret < 0) { 63 dev_err(chip->dev, "Failed to disable active discharge: %d\n", 64 ret); 65 return ret; 66 } 67 } 68 69 return 0; 70 } 71 72 static int aw37503_regulator_disable(struct regulator_dev *rdev) 73 { 74 struct aw37503_regulator *chip = rdev_get_drvdata(rdev); 75 int id = rdev_get_id(rdev); 76 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; 77 78 if (!IS_ERR(rpdata->en_gpiod)) { 79 gpiod_set_value_cansleep(rpdata->en_gpiod, 0); 80 rpdata->ena_gpio_state = 0; 81 } 82 83 return 0; 84 } 85 86 static int aw37503_regulator_is_enabled(struct regulator_dev *rdev) 87 { 88 struct aw37503_regulator *chip = rdev_get_drvdata(rdev); 89 int id = rdev_get_id(rdev); 90 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; 91 92 if (!IS_ERR(rpdata->en_gpiod)) 93 return rpdata->ena_gpio_state; 94 95 return 1; 96 } 97 98 static const struct regulator_ops aw37503_regulator_ops = { 99 .enable = aw37503_regulator_enable, 100 .disable = aw37503_regulator_disable, 101 .is_enabled = aw37503_regulator_is_enabled, 102 .list_voltage = regulator_list_voltage_linear, 103 .map_voltage = regulator_map_voltage_linear, 104 .get_voltage_sel = regulator_get_voltage_sel_regmap, 105 .set_voltage_sel = regulator_set_voltage_sel_regmap, 106 .set_active_discharge = regulator_set_active_discharge_regmap, 107 }; 108 109 static int aw37503_of_parse_cb(struct device_node *np, 110 const struct regulator_desc *desc, 111 struct regulator_config *config) 112 { 113 struct aw37503_regulator *chip = config->driver_data; 114 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id]; 115 int ret; 116 117 rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np), 118 "enable", GPIOD_OUT_LOW, 119 "enable"); 120 121 if (IS_ERR(rpdata->en_gpiod)) { 122 ret = PTR_ERR(rpdata->en_gpiod); 123 124 /* Ignore the error other than probe defer */ 125 if (ret == -EPROBE_DEFER) 126 return ret; 127 return 0; 128 } 129 130 return 0; 131 } 132 133 #define AW37503_REGULATOR_DESC(_id, _name) \ 134 [AW37503_REGULATOR_ID_##_id] = { \ 135 .name = "aw37503-"#_name, \ 136 .supply_name = "vin", \ 137 .id = AW37503_REGULATOR_ID_##_id, \ 138 .of_match = of_match_ptr(#_name), \ 139 .of_parse_cb = aw37503_of_parse_cb, \ 140 .ops = &aw37503_regulator_ops, \ 141 .n_voltages = AW37503_VOUT_N_VOLTAGE, \ 142 .min_uV = AW37503_VOUT_VMIN, \ 143 .uV_step = AW37503_VOUT_STEP, \ 144 .enable_time = 500, \ 145 .vsel_mask = AW37503_VOUT_MASK, \ 146 .vsel_reg = AW37503_REG_##_id, \ 147 .active_discharge_off = 0, \ 148 .active_discharge_on = AW37503_REG_APPS_DIS_##_id, \ 149 .active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \ 150 .active_discharge_reg = AW37503_REG_APPS, \ 151 .type = REGULATOR_VOLTAGE, \ 152 .owner = THIS_MODULE, \ 153 } 154 155 static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = { 156 AW37503_REGULATOR_DESC(VPOS, outp), 157 AW37503_REGULATOR_DESC(VNEG, outn), 158 }; 159 160 static const struct regmap_range aw37503_no_reg_ranges[] = { 161 regmap_reg_range(AW37503_REG_CONTROL + 1, 162 AW37503_REG_WPRTEN - 1), 163 }; 164 165 static const struct regmap_access_table aw37503_no_reg_table = { 166 .no_ranges = aw37503_no_reg_ranges, 167 .n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges), 168 }; 169 170 static const struct regmap_config aw37503_regmap_config = { 171 .reg_bits = 8, 172 .val_bits = 8, 173 .max_register = AW37503_REG_WPRTEN, 174 .rd_table = &aw37503_no_reg_table, 175 .wr_table = &aw37503_no_reg_table, 176 }; 177 178 static int aw37503_probe(struct i2c_client *client) 179 { 180 struct device *dev = &client->dev; 181 struct aw37503_regulator *chip; 182 struct regulator_dev *rdev; 183 struct regmap *regmap; 184 struct regulator_config config = { }; 185 int id; 186 187 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 188 if (!chip) 189 return -ENOMEM; 190 191 regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config); 192 if (IS_ERR(regmap)) 193 return dev_err_probe(dev, PTR_ERR(regmap), 194 "Failed to init regmap\n"); 195 196 i2c_set_clientdata(client, chip); 197 chip->dev = dev; 198 199 config.regmap = regmap; 200 config.dev = dev; 201 config.driver_data = chip; 202 203 for (id = 0; id < AW37503_MAX_REGULATORS; ++id) { 204 rdev = devm_regulator_register(dev, &aw_regs_desc[id], 205 &config); 206 if (IS_ERR(rdev)) 207 return dev_err_probe(dev, PTR_ERR(rdev), 208 "Failed to register regulator %s\n", 209 aw_regs_desc[id].name); 210 } 211 return 0; 212 } 213 214 static const struct i2c_device_id aw37503_id[] = { 215 {.name = "aw37503",}, 216 {}, 217 }; 218 MODULE_DEVICE_TABLE(i2c, aw37503_id); 219 220 static const struct of_device_id aw37503_of_match[] = { 221 {.compatible = "awinic,aw37503",}, 222 { /* Sentinel */ }, 223 }; 224 225 MODULE_DEVICE_TABLE(of, aw37503_of_match); 226 227 static struct i2c_driver aw37503_i2c_driver = { 228 .driver = { 229 .name = "aw37503", 230 .of_match_table = aw37503_of_match, 231 }, 232 .probe = aw37503_probe, 233 .id_table = aw37503_id, 234 }; 235 236 module_i2c_driver(aw37503_i2c_driver); 237 238 MODULE_DESCRIPTION("aw37503 regulator driver"); 239 MODULE_AUTHOR("Alec Li <like@awinic.com>"); 240 MODULE_LICENSE("GPL"); 241