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0009 #include <linux/gpio/consumer.h>
0010 #include <linux/module.h>
0011 #include <linux/i2c.h>
0012 #include <linux/of_device.h>
0013 #include <linux/regmap.h>
0014 #include <linux/regulator/driver.h>
0015 #include <linux/regulator/of_regulator.h>
0016
0017 #define SY8827N_VSEL0 0
0018 #define SY8827N_BUCK_EN (1 << 7)
0019 #define SY8827N_MODE (1 << 6)
0020 #define SY8827N_VSEL1 1
0021 #define SY8827N_CTRL 2
0022 #define SY8827N_ID1 3
0023 #define SY8827N_ID2 4
0024 #define SY8827N_PGOOD 5
0025 #define SY8827N_MAX (SY8827N_PGOOD + 1)
0026
0027 #define SY8827N_NVOLTAGES 64
0028 #define SY8827N_VSELMIN 600000
0029 #define SY8827N_VSELSTEP 12500
0030
0031 struct sy8827n_device_info {
0032 struct device *dev;
0033 struct regulator_desc desc;
0034 struct regulator_init_data *regulator;
0035 struct gpio_desc *en_gpio;
0036 unsigned int vsel_reg;
0037 };
0038
0039 static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
0040 {
0041 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
0042
0043 switch (mode) {
0044 case REGULATOR_MODE_FAST:
0045 regmap_update_bits(rdev->regmap, di->vsel_reg,
0046 SY8827N_MODE, SY8827N_MODE);
0047 break;
0048 case REGULATOR_MODE_NORMAL:
0049 regmap_update_bits(rdev->regmap, di->vsel_reg,
0050 SY8827N_MODE, 0);
0051 break;
0052 default:
0053 return -EINVAL;
0054 }
0055 return 0;
0056 }
0057
0058 static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
0059 {
0060 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
0061 u32 val;
0062 int ret = 0;
0063
0064 ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
0065 if (ret < 0)
0066 return ret;
0067 if (val & SY8827N_MODE)
0068 return REGULATOR_MODE_FAST;
0069 else
0070 return REGULATOR_MODE_NORMAL;
0071 }
0072
0073 static const struct regulator_ops sy8827n_regulator_ops = {
0074 .set_voltage_sel = regulator_set_voltage_sel_regmap,
0075 .get_voltage_sel = regulator_get_voltage_sel_regmap,
0076 .set_voltage_time_sel = regulator_set_voltage_time_sel,
0077 .map_voltage = regulator_map_voltage_linear,
0078 .list_voltage = regulator_list_voltage_linear,
0079 .enable = regulator_enable_regmap,
0080 .disable = regulator_disable_regmap,
0081 .is_enabled = regulator_is_enabled_regmap,
0082 .set_mode = sy8827n_set_mode,
0083 .get_mode = sy8827n_get_mode,
0084 };
0085
0086 static int sy8827n_regulator_register(struct sy8827n_device_info *di,
0087 struct regulator_config *config)
0088 {
0089 struct regulator_desc *rdesc = &di->desc;
0090 struct regulator_dev *rdev;
0091
0092 rdesc->name = "sy8827n-reg";
0093 rdesc->supply_name = "vin";
0094 rdesc->ops = &sy8827n_regulator_ops;
0095 rdesc->type = REGULATOR_VOLTAGE;
0096 rdesc->n_voltages = SY8827N_NVOLTAGES;
0097 rdesc->enable_reg = di->vsel_reg;
0098 rdesc->enable_mask = SY8827N_BUCK_EN;
0099 rdesc->min_uV = SY8827N_VSELMIN;
0100 rdesc->uV_step = SY8827N_VSELSTEP;
0101 rdesc->vsel_reg = di->vsel_reg;
0102 rdesc->vsel_mask = rdesc->n_voltages - 1;
0103 rdesc->owner = THIS_MODULE;
0104
0105 rdev = devm_regulator_register(di->dev, &di->desc, config);
0106 return PTR_ERR_OR_ZERO(rdev);
0107 }
0108
0109 static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
0110 {
0111 if (reg == SY8827N_PGOOD)
0112 return true;
0113 return false;
0114 }
0115
0116 static const struct regmap_config sy8827n_regmap_config = {
0117 .reg_bits = 8,
0118 .val_bits = 8,
0119 .volatile_reg = sy8827n_volatile_reg,
0120 .num_reg_defaults_raw = SY8827N_MAX,
0121 .cache_type = REGCACHE_FLAT,
0122 };
0123
0124 static int sy8827n_i2c_probe(struct i2c_client *client)
0125 {
0126 struct device *dev = &client->dev;
0127 struct device_node *np = dev->of_node;
0128 struct sy8827n_device_info *di;
0129 struct regulator_config config = { };
0130 struct regmap *regmap;
0131 int ret;
0132
0133 di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
0134 if (!di)
0135 return -ENOMEM;
0136
0137 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
0138 if (!di->regulator) {
0139 dev_err(dev, "Platform data not found!\n");
0140 return -EINVAL;
0141 }
0142
0143 di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
0144 if (IS_ERR(di->en_gpio))
0145 return PTR_ERR(di->en_gpio);
0146
0147 if (of_property_read_bool(np, "silergy,vsel-state-high"))
0148 di->vsel_reg = SY8827N_VSEL1;
0149 else
0150 di->vsel_reg = SY8827N_VSEL0;
0151
0152 di->dev = dev;
0153
0154 regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
0155 if (IS_ERR(regmap)) {
0156 dev_err(dev, "Failed to allocate regmap!\n");
0157 return PTR_ERR(regmap);
0158 }
0159 i2c_set_clientdata(client, di);
0160
0161 config.dev = di->dev;
0162 config.init_data = di->regulator;
0163 config.regmap = regmap;
0164 config.driver_data = di;
0165 config.of_node = np;
0166
0167 ret = sy8827n_regulator_register(di, &config);
0168 if (ret < 0)
0169 dev_err(dev, "Failed to register regulator!\n");
0170 return ret;
0171 }
0172
0173 #ifdef CONFIG_OF
0174 static const struct of_device_id sy8827n_dt_ids[] = {
0175 {
0176 .compatible = "silergy,sy8827n",
0177 },
0178 { }
0179 };
0180 MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
0181 #endif
0182
0183 static const struct i2c_device_id sy8827n_id[] = {
0184 { "sy8827n", },
0185 { },
0186 };
0187 MODULE_DEVICE_TABLE(i2c, sy8827n_id);
0188
0189 static struct i2c_driver sy8827n_regulator_driver = {
0190 .driver = {
0191 .name = "sy8827n-regulator",
0192 .of_match_table = of_match_ptr(sy8827n_dt_ids),
0193 },
0194 .probe_new = sy8827n_i2c_probe,
0195 .id_table = sy8827n_id,
0196 };
0197 module_i2c_driver(sy8827n_regulator_driver);
0198
0199 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
0200 MODULE_DESCRIPTION("SY8827N regulator driver");
0201 MODULE_LICENSE("GPL v2");
