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.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 #define SY8827N_ID1             3
  23 #define SY8827N_ID2             4
  24 #define SY8827N_PGOOD           5
  25 #define SY8827N_MAX             (SY8827N_PGOOD + 1)
  26
  27 #define SY8827N_NVOLTAGES       64
  28 #define SY8827N_VSELMIN         600000
  29 #define SY8827N_VSELSTEP        12500
  30
  31 struct sy8827n_device_info {
  32         struct device *dev;
  33         struct regulator_desc desc;
  34         struct regulator_init_data *regulator;
  35         struct gpio_desc *en_gpio;
  36         unsigned int vsel_reg;
  37 };
  38
  39 static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
  40 {
  41         struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
  42
  43         switch (mode) {
  44         case REGULATOR_MODE_FAST:
  45                 regmap_update_bits(rdev->regmap, di->vsel_reg,
  46                                    SY8827N_MODE, SY8827N_MODE);
  47                 break;
  48         case REGULATOR_MODE_NORMAL:
  49                 regmap_update_bits(rdev->regmap, di->vsel_reg,
  50                                    SY8827N_MODE, 0);
  51                 break;
  52         default:
  53                 return -EINVAL;
  54         }
  55         return 0;
  56 }
  57
  58 static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
  59 {
  60         struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
  61         u32 val;
  62         int ret = 0;
  63
  64         ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
  65         if (ret < 0)
  66                 return ret;
  67         if (val & SY8827N_MODE)
  68                 return REGULATOR_MODE_FAST;
  69         else
  70                 return REGULATOR_MODE_NORMAL;
  71 }
  72
  73 static const struct regulator_ops sy8827n_regulator_ops = {
  74         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  75         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  76         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  77         .map_voltage = regulator_map_voltage_linear,
  78         .list_voltage = regulator_list_voltage_linear,
  79         .enable = regulator_enable_regmap,
  80         .disable = regulator_disable_regmap,
  81         .is_enabled = regulator_is_enabled_regmap,
  82         .set_mode = sy8827n_set_mode,
  83         .get_mode = sy8827n_get_mode,
  84 };
  85
  86 static int sy8827n_regulator_register(struct sy8827n_device_info *di,
  87                         struct regulator_config *config)
  88 {
  89         struct regulator_desc *rdesc = &di->desc;
  90         struct regulator_dev *rdev;
  91
  92         rdesc->name = "sy8827n-reg";
  93         rdesc->supply_name = "vin";
  94         rdesc->ops = &sy8827n_regulator_ops;
  95         rdesc->type = REGULATOR_VOLTAGE;
  96         rdesc->n_voltages = SY8827N_NVOLTAGES;
  97         rdesc->enable_reg = di->vsel_reg;
  98         rdesc->enable_mask = SY8827N_BUCK_EN;
  99         rdesc->min_uV = SY8827N_VSELMIN;
 100         rdesc->uV_step = SY8827N_VSELSTEP;
 101         rdesc->vsel_reg = di->vsel_reg;
 102         rdesc->vsel_mask = rdesc->n_voltages - 1;
 103         rdesc->owner = THIS_MODULE;
 104
 105         rdev = devm_regulator_register(di->dev, &di->desc, config);
 106         return PTR_ERR_OR_ZERO(rdev);
 107 }
 108
 109 static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
 110 {
 111         if (reg == SY8827N_PGOOD)
 112                 return true;
 113         return false;
 114 }
 115
 116 static const struct regmap_config sy8827n_regmap_config = {
 117         .reg_bits = 8,
 118         .val_bits = 8,
 119         .volatile_reg = sy8827n_volatile_reg,
 120         .num_reg_defaults_raw = SY8827N_MAX,
 121         .cache_type = REGCACHE_FLAT,
 122 };
 123
 124 static int sy8827n_i2c_probe(struct i2c_client *client)
 125 {
 126         struct device *dev = &client->dev;
 127         struct device_node *np = dev->of_node;
 128         struct sy8827n_device_info *di;
 129         struct regulator_config config = { };
 130         struct regmap *regmap;
 131         int ret;
 132
 133         di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
 134         if (!di)
 135                 return -ENOMEM;
 136
 137         di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
 138         if (!di->regulator) {
 139                 dev_err(dev, "Platform data not found!\n");
 140                 return -EINVAL;
 141         }
 142
 143         di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
 144         if (IS_ERR(di->en_gpio))
 145                 return PTR_ERR(di->en_gpio);
 146
 147         if (of_property_read_bool(np, "silergy,vsel-state-high"))
 148                 di->vsel_reg = SY8827N_VSEL1;
 149         else
 150                 di->vsel_reg = SY8827N_VSEL0;
 151
 152         di->dev = dev;
 153
 154         regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
 155         if (IS_ERR(regmap)) {
 156                 dev_err(dev, "Failed to allocate regmap!\n");
 157                 return PTR_ERR(regmap);
 158         }
 159         i2c_set_clientdata(client, di);
 160
 161         config.dev = di->dev;
 162         config.init_data = di->regulator;
 163         config.regmap = regmap;
 164         config.driver_data = di;
 165         config.of_node = np;
 166
 167         ret = sy8827n_regulator_register(di, &config);
 168         if (ret < 0)
 169                 dev_err(dev, "Failed to register regulator!\n");
 170         return ret;
 171 }
 172
 173 static const struct of_device_id sy8827n_dt_ids[] = {
 174         {
 175                 .compatible = "silergy,sy8827n",
 176         },
 177         { }
 178 };
 179 MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
 180
 181 static const struct i2c_device_id sy8827n_id[] = {
 182         { "sy8827n", },
 183         { },
 184 };
 185 MODULE_DEVICE_TABLE(i2c, sy8827n_id);
 186
 187 static struct i2c_driver sy8827n_regulator_driver = {
 188         .driver = {
 189                 .name = "sy8827n-regulator",
 190                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 191                 .of_match_table = sy8827n_dt_ids,
 192         },
 193         .probe = sy8827n_i2c_probe,
 194         .id_table = sy8827n_id,
 195 };
 196 module_i2c_driver(sy8827n_regulator_driver);
 197
 198 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 199 MODULE_DESCRIPTION("SY8827N regulator driver");
 200 MODULE_LICENSE("GPL v2");