drivers/regulator/sy8827n.c

   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");