1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // SY8827N regulator driver 4 // 5 // Copyright (C) 2020 Synaptics Incorporated 6 // 7 // Author: Jisheng Zhang <jszhang@kernel.org> 8 9 #include <linux/gpio/consumer.h> 10 #include <linux/module.h> 11 #include <linux/i2c.h> 12 #include <linux/of_device.h> 13 #include <linux/regmap.h> 14 #include <linux/regulator/driver.h> 15 #include <linux/regulator/of_regulator.h> 16 17 #define SY8827N_VSEL0 0 18 #define SY8827N_BUCK_EN (1 << 7) 19 #define SY8827N_MODE (1 << 6) 20 #define SY8827N_VSEL1 1 21 #define SY8827N_CTRL 2 22 23 #define SY8827N_NVOLTAGES 64 24 #define SY8827N_VSELMIN 600000 25 #define SY8827N_VSELSTEP 12500 26 27 struct sy8827n_device_info { 28 struct device *dev; 29 struct regulator_desc desc; 30 struct regulator_init_data *regulator; 31 struct gpio_desc *en_gpio; 32 unsigned int vsel_reg; 33 }; 34 35 static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode) 36 { 37 struct sy8827n_device_info *di = rdev_get_drvdata(rdev); 38 39 switch (mode) { 40 case REGULATOR_MODE_FAST: 41 regmap_update_bits(rdev->regmap, di->vsel_reg, 42 SY8827N_MODE, SY8827N_MODE); 43 break; 44 case REGULATOR_MODE_NORMAL: 45 regmap_update_bits(rdev->regmap, di->vsel_reg, 46 SY8827N_MODE, 0); 47 break; 48 default: 49 return -EINVAL; 50 } 51 return 0; 52 } 53 54 static unsigned int sy8827n_get_mode(struct regulator_dev *rdev) 55 { 56 struct sy8827n_device_info *di = rdev_get_drvdata(rdev); 57 u32 val; 58 int ret = 0; 59 60 ret = regmap_read(rdev->regmap, di->vsel_reg, &val); 61 if (ret < 0) 62 return ret; 63 if (val & SY8827N_MODE) 64 return REGULATOR_MODE_FAST; 65 else 66 return REGULATOR_MODE_NORMAL; 67 } 68 69 static const struct regulator_ops sy8827n_regulator_ops = { 70 .set_voltage_sel = regulator_set_voltage_sel_regmap, 71 .get_voltage_sel = regulator_get_voltage_sel_regmap, 72 .set_voltage_time_sel = regulator_set_voltage_time_sel, 73 .map_voltage = regulator_map_voltage_linear, 74 .list_voltage = regulator_list_voltage_linear, 75 .enable = regulator_enable_regmap, 76 .disable = regulator_disable_regmap, 77 .is_enabled = regulator_is_enabled_regmap, 78 .set_mode = sy8827n_set_mode, 79 .get_mode = sy8827n_get_mode, 80 }; 81 82 static int sy8827n_regulator_register(struct sy8827n_device_info *di, 83 struct regulator_config *config) 84 { 85 struct regulator_desc *rdesc = &di->desc; 86 struct regulator_dev *rdev; 87 88 rdesc->name = "sy8827n-reg"; 89 rdesc->supply_name = "vin"; 90 rdesc->ops = &sy8827n_regulator_ops; 91 rdesc->type = REGULATOR_VOLTAGE; 92 rdesc->n_voltages = SY8827N_NVOLTAGES; 93 rdesc->enable_reg = di->vsel_reg; 94 rdesc->enable_mask = SY8827N_BUCK_EN; 95 rdesc->min_uV = SY8827N_VSELMIN; 96 rdesc->uV_step = SY8827N_VSELSTEP; 97 rdesc->vsel_reg = di->vsel_reg; 98 rdesc->vsel_mask = rdesc->n_voltages - 1; 99 rdesc->owner = THIS_MODULE; 100 101 rdev = devm_regulator_register(di->dev, &di->desc, config); 102 return PTR_ERR_OR_ZERO(rdev); 103 } 104 105 static const struct regmap_config sy8827n_regmap_config = { 106 .reg_bits = 8, 107 .val_bits = 8, 108 }; 109 110 static int sy8827n_i2c_probe(struct i2c_client *client) 111 { 112 struct device *dev = &client->dev; 113 struct device_node *np = dev->of_node; 114 struct sy8827n_device_info *di; 115 struct regulator_config config = { }; 116 struct regmap *regmap; 117 int ret; 118 119 di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL); 120 if (!di) 121 return -ENOMEM; 122 123 di->regulator = of_get_regulator_init_data(dev, np, &di->desc); 124 if (!di->regulator) { 125 dev_err(dev, "Platform data not found!\n"); 126 return -EINVAL; 127 } 128 129 di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); 130 if (IS_ERR(di->en_gpio)) 131 return PTR_ERR(di->en_gpio); 132 133 if (of_property_read_bool(np, "silergy,vsel-state-high")) 134 di->vsel_reg = SY8827N_VSEL1; 135 else 136 di->vsel_reg = SY8827N_VSEL0; 137 138 di->dev = dev; 139 140 regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config); 141 if (IS_ERR(regmap)) { 142 dev_err(dev, "Failed to allocate regmap!\n"); 143 return PTR_ERR(regmap); 144 } 145 i2c_set_clientdata(client, di); 146 147 config.dev = di->dev; 148 config.init_data = di->regulator; 149 config.regmap = regmap; 150 config.driver_data = di; 151 config.of_node = np; 152 153 ret = sy8827n_regulator_register(di, &config); 154 if (ret < 0) 155 dev_err(dev, "Failed to register regulator!\n"); 156 return ret; 157 } 158 159 #ifdef CONFIG_OF 160 static const struct of_device_id sy8827n_dt_ids[] = { 161 { 162 .compatible = "silergy,sy8827n", 163 }, 164 { } 165 }; 166 MODULE_DEVICE_TABLE(of, sy8827n_dt_ids); 167 #endif 168 169 static const struct i2c_device_id sy8827n_id[] = { 170 { "sy8827n", }, 171 { }, 172 }; 173 MODULE_DEVICE_TABLE(i2c, sy8827n_id); 174 175 static struct i2c_driver sy8827n_regulator_driver = { 176 .driver = { 177 .name = "sy8827n-regulator", 178 .of_match_table = of_match_ptr(sy8827n_dt_ids), 179 }, 180 .probe_new = sy8827n_i2c_probe, 181 .id_table = sy8827n_id, 182 }; 183 module_i2c_driver(sy8827n_regulator_driver); 184 185 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); 186 MODULE_DESCRIPTION("SY8827N regulator driver"); 187 MODULE_LICENSE("GPL v2"); 188