drivers/regulator/sy8824x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // SY8824C/SY8824E regulator driver
   4 //
   5 // Copyright (C) 2019 Synaptics Incorporated
   6 //
   7 // Author: Jisheng Zhang <jszhang@kernel.org>
   8
   9 #include <linux/module.h>
  10 #include <linux/i2c.h>
  11 #include <linux/of_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15
  16 #define SY8824C_BUCK_EN         (1 << 7)
  17 #define SY8824C_MODE            (1 << 6)
  18
  19 struct sy8824_config {
  20         /* registers */
  21         unsigned int vol_reg;
  22         unsigned int mode_reg;
  23         unsigned int enable_reg;
  24         /* Voltage range and step(linear) */
  25         unsigned int vsel_min;
  26         unsigned int vsel_step;
  27         unsigned int vsel_count;
  28 };
  29
  30 struct sy8824_device_info {
  31         struct device *dev;
  32         struct regulator_desc desc;
  33         struct regulator_init_data *regulator;
  34         const struct sy8824_config *cfg;
  35 };
  36
  37 static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
  38 {
  39         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  40         const struct sy8824_config *cfg = di->cfg;
  41
  42         switch (mode) {
  43         case REGULATOR_MODE_FAST:
  44                 regmap_update_bits(rdev->regmap, cfg->mode_reg,
  45                                    SY8824C_MODE, SY8824C_MODE);
  46                 break;
  47         case REGULATOR_MODE_NORMAL:
  48                 regmap_update_bits(rdev->regmap, cfg->mode_reg,
  49                                    SY8824C_MODE, 0);
  50                 break;
  51         default:
  52                 return -EINVAL;
  53         }
  54         return 0;
  55 }
  56
  57 static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
  58 {
  59         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  60         const struct sy8824_config *cfg = di->cfg;
  61         u32 val;
  62         int ret = 0;
  63
  64         ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
  65         if (ret < 0)
  66                 return ret;
  67         if (val & SY8824C_MODE)
  68                 return REGULATOR_MODE_FAST;
  69         else
  70                 return REGULATOR_MODE_NORMAL;
  71 }
  72
  73 static const struct regulator_ops sy8824_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 = sy8824_set_mode,
  83         .get_mode = sy8824_get_mode,
  84 };
  85
  86 static int sy8824_regulator_register(struct sy8824_device_info *di,
  87                         struct regulator_config *config)
  88 {
  89         struct regulator_desc *rdesc = &di->desc;
  90         const struct sy8824_config *cfg = di->cfg;
  91         struct regulator_dev *rdev;
  92
  93         rdesc->name = "sy8824-reg";
  94         rdesc->supply_name = "vin";
  95         rdesc->ops = &sy8824_regulator_ops;
  96         rdesc->type = REGULATOR_VOLTAGE;
  97         rdesc->n_voltages = cfg->vsel_count;
  98         rdesc->enable_reg = cfg->enable_reg;
  99         rdesc->enable_mask = SY8824C_BUCK_EN;
 100         rdesc->min_uV = cfg->vsel_min;
 101         rdesc->uV_step = cfg->vsel_step;
 102         rdesc->vsel_reg = cfg->vol_reg;
 103         rdesc->vsel_mask = cfg->vsel_count - 1;
 104         rdesc->owner = THIS_MODULE;
 105
 106         rdev = devm_regulator_register(di->dev, &di->desc, config);
 107         return PTR_ERR_OR_ZERO(rdev);
 108 }
 109
 110 static const struct regmap_config sy8824_regmap_config = {
 111         .reg_bits = 8,
 112         .val_bits = 8,
 113 };
 114
 115 static int sy8824_i2c_probe(struct i2c_client *client)
 116 {
 117         struct device *dev = &client->dev;
 118         struct device_node *np = dev->of_node;
 119         struct sy8824_device_info *di;
 120         struct regulator_config config = { };
 121         struct regmap *regmap;
 122         int ret;
 123
 124         di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
 125         if (!di)
 126                 return -ENOMEM;
 127
 128         di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
 129         if (!di->regulator) {
 130                 dev_err(dev, "Platform data not found!\n");
 131                 return -EINVAL;
 132         }
 133
 134         di->dev = dev;
 135         di->cfg = of_device_get_match_data(dev);
 136
 137         regmap = devm_regmap_init_i2c(client, &sy8824_regmap_config);
 138         if (IS_ERR(regmap)) {
 139                 dev_err(dev, "Failed to allocate regmap!\n");
 140                 return PTR_ERR(regmap);
 141         }
 142         i2c_set_clientdata(client, di);
 143
 144         config.dev = di->dev;
 145         config.init_data = di->regulator;
 146         config.regmap = regmap;
 147         config.driver_data = di;
 148         config.of_node = np;
 149
 150         ret = sy8824_regulator_register(di, &config);
 151         if (ret < 0)
 152                 dev_err(dev, "Failed to register regulator!\n");
 153         return ret;
 154 }
 155
 156 static const struct sy8824_config sy8824c_cfg = {
 157         .vol_reg = 0x00,
 158         .mode_reg = 0x00,
 159         .enable_reg = 0x00,
 160         .vsel_min = 762500,
 161         .vsel_step = 12500,
 162         .vsel_count = 64,
 163 };
 164
 165 static const struct sy8824_config sy8824e_cfg = {
 166         .vol_reg = 0x00,
 167         .mode_reg = 0x00,
 168         .enable_reg = 0x00,
 169         .vsel_min = 700000,
 170         .vsel_step = 12500,
 171         .vsel_count = 64,
 172 };
 173
 174 static const struct sy8824_config sy20276_cfg = {
 175         .vol_reg = 0x00,
 176         .mode_reg = 0x01,
 177         .enable_reg = 0x01,
 178         .vsel_min = 600000,
 179         .vsel_step = 10000,
 180         .vsel_count = 128,
 181 };
 182
 183 static const struct sy8824_config sy20278_cfg = {
 184         .vol_reg = 0x00,
 185         .mode_reg = 0x01,
 186         .enable_reg = 0x01,
 187         .vsel_min = 762500,
 188         .vsel_step = 12500,
 189         .vsel_count = 64,
 190 };
 191
 192 static const struct of_device_id sy8824_dt_ids[] = {
 193         {
 194                 .compatible = "silergy,sy8824c",
 195                 .data = &sy8824c_cfg
 196         },
 197         {
 198                 .compatible = "silergy,sy8824e",
 199                 .data = &sy8824e_cfg
 200         },
 201         {
 202                 .compatible = "silergy,sy20276",
 203                 .data = &sy20276_cfg
 204         },
 205         {
 206                 .compatible = "silergy,sy20278",
 207                 .data = &sy20278_cfg
 208         },
 209         { }
 210 };
 211 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
 212
 213 static const struct i2c_device_id sy8824_id[] = {
 214         { "sy8824", },
 215         { },
 216 };
 217 MODULE_DEVICE_TABLE(i2c, sy8824_id);
 218
 219 static struct i2c_driver sy8824_regulator_driver = {
 220         .driver = {
 221                 .name = "sy8824-regulator",
 222                 .of_match_table = of_match_ptr(sy8824_dt_ids),
 223         },
 224         .probe_new = sy8824_i2c_probe,
 225         .id_table = sy8824_id,
 226 };
 227 module_i2c_driver(sy8824_regulator_driver);
 228
 229 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 230 MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
 231 MODULE_LICENSE("GPL v2");